JP2009279790A - Lens, its method for manufacturing, lens array, camera module, its method for manufacturing, and electronic equipment - Google Patents

Abstract

A method for manufacturing a lens that achieves miniaturization and thickness reduction and imparts high reliability (environmental resistance) and performance using a simple and inexpensive method.
A substrate having a through hole is disposed on a lower mold and a resin is injected from above the substrate. Thereafter, pressure is applied by the upper mold 21, and the resin 43 is cured in a state where the pressure is applied. In the pressing step, the upper mold 21 and the lower mold 20 are at a predetermined distance so that the resin 43 fills the through-hole 4 of the substrate 2 and the resin 43 extends on at least one surface of the substrate 2. Apply pressure.
[Selection] Figure 1

Description

  The present invention relates to a lens, a manufacturing method thereof, and a lens array using the lens.

  The present invention relates to a camera module including the lens as a constituent member and an electronic apparatus using the camera module.

  Conventionally, camera modules have been widely used in digital still cameras, mobile phone cameras, and the like.

  The camera module converts light from a subject into an electrical signal and forms image data of the subject based on the electrical signal. The camera module includes an image sensor including a light receiving element that recognizes light from a subject imaged by a lens. The light recognized by the light receiving element is converted into an electrical signal and output as the electrical signal. Based on the output electrical signal, an image of the subject is formed in the processing section of the camera module.

  Usually, the camera module includes at least an image sensor and one or more lenses. The lens and the image sensor made up of the light receiving element are formed separately. When the camera module is assembled, the lens and the image sensor are aligned, and the lens is optically coupled to the image sensor.

  The relative positional accuracy between the lens and the image sensor greatly affects the image signal output via the camera module. For this reason, high positional accuracy is required for alignment between the lens and the image sensor. However, since the relative positional accuracy between the lens and the light receiving element of the image sensor depends on many components such as an assembly error of the camera module, it is difficult to make it uniform in each camera module. .

  For this reason, it is necessary to provide a process of detecting a relative position shift between the lens and the image sensor and correcting each position at the stage of forming the camera module. However, this process for correcting the position is required for each camera module, which causes an increase in the number of camera module manufacturing processes, resulting in an increase in manufacturing cost.

  As a manufacturing method of the camera module, for example, a manufacturing method disclosed in Patent Document 1 can be cited. Patent Document 1 discloses a lens array in which a through hole is formed in advance in a lens substrate, and a lens is formed in the through hole. FIG. 15 shows the configuration of the lens array of Patent Document 1. As shown in FIG. 15A, the lens array 100 of Patent Document 1 includes a plurality of lenses 103 including a lens unit 101 and a lens substrate 102 in which the lens unit 101 is embedded. The lens substrate 102 is a light-shielding member such as glass, plastic, or resin, and light incident on the lens array 100 is emitted through each lens portion 101 of the lens 103.

Patent Document 2 discloses a light shielding member integrated lens in which a lens is formed on the light shielding member. FIG. 16 shows the configuration. As shown in FIG. 16, the lens 200 of Patent Document 2 includes a cylindrical light-shielding lens frame 201 and a lens unit 202 loaded in the light-shielding lens frame 201. In the lens 200 of Patent Document 2, a lens portion 202 is integrally formed in a light shielding lens frame 201 by insert molding.
Special Table 2005-539276 Publication (announced on December 22, 2005) JP 2005-84328 A (published March 31, 2005)

  In the lens array 100 disclosed in Patent Document 1, as shown in FIG. 15A, the lens unit 101 is located only near the through hole of the lens substrate 102, and each of the plurality of lens units 101 is a lens substrate. They are arranged independently via 102. For this reason, even when contraction occurs in any of the lens portions 101, no positional deviation occurs in the surface direction of the lens array 100.

  However, the lens substrate 102 is a molded product and does not have sufficient height accuracy in the height direction (thickness direction) of the lens array 100. For this reason, for example, when the camera module 110 including the two lenses 103 shown in FIG. 15B is configured, the two lenses 103 and the image sensor 104 are bonded together when the two lenses 103 are bonded together. When pasting together via the spacer 105, the alignment in the optical axis direction cannot be maintained with high accuracy, and as a result, there is a problem that a highly accurate camera module cannot be manufactured.

  Moreover, since high accuracy is required for the alignment at the time of bonding as described above, there is a problem that the yield is lowered as a result.

  Furthermore, since the thickness of the lens portion 101 depends on the thickness of the lens substrate 102, there is a problem that the high-performance lens 103 cannot be provided if the thickness of the lens substrate 102 varies.

  On the other hand, in the lens 200 disclosed in Patent Document 2, as shown in FIG. 16, the light-shielding lens frame 201 that is a light-shielding member is filled with resin from a specific direction and cured to mold the lens unit 202. is doing. For this reason, the light-shielding lens frame 201 is warped due to curing and shrinkage of the resin, and a problem that a highly accurate shape of the lens portion 202 cannot be obtained occurs.

  Further, since it is necessary to fill the entire light-shielding lens frame 201 with a resin, there arises a problem that the lens portion 202 is necessarily enlarged.

  In view of the above problems, an object of the present invention is to achieve a reduction in size and thickness using a simple and inexpensive method, and a lens having high reliability (environment resistance) and performance, and a method for manufacturing the same, In addition, a lens array using the lens is provided.

Another object of the present invention is to provide a camera module including the lens as a constituent member and an electronic device using the camera module.
It is.

  In order to achieve the above object, a lens manufacturing method according to the present invention includes a substrate placement step of placing a substrate having a through-hole on a second mold, and a resin on the substrate placed on the second mold. A step of injecting a resin, a pressing step of applying pressure by a first mold from the side where the resin is injected, and a resin curing step of curing the resin in a state where the pressure is applied, In the pressing step, the resin fills the through hole of the substrate, and the resin extends at least on the first surface of the substrate. Thus, pressure is applied until the first mold and the second mold reach a predetermined distance.

  In the above lens manufacturing method, the resin covers the first surface of the substrate, so that even if the thickness of the substrate varies, the resin flows in to compensate for the variation. For this reason, the lens thickness is determined by the positioning accuracy of the first and second molds, and a lens having a high thickness accuracy can be manufactured.

  Furthermore, since the first mold and the first surface of the substrate are not in direct contact with each other, the force when closing the first mold and the second mold can be transmitted to the resin as pressure, which is affected by the resin shrinkage during curing. Therefore, the resin transfer accuracy is improved with respect to the first mold and the second mold, and a high-quality lens can be manufactured.

  When the surface of the substrate facing the second mold is the second surface, the resin extends on the second surface of the substrate except for the contact surface with the second mold. Is preferred.

  In this case, the resin also covers a part of the second surface of the substrate so that the warp of the substrate due to the resin shrinkage cancels out with a warp in a direction different from the direction due to the resin shrinkage extending to the first surface of the substrate. Therefore, it is possible to reduce the overall warpage and to manufacture a highly accurate and highly reliable lens.

  Furthermore, the second mold and the substrate can be brought into contact with each other in a partial region of the second surface of the substrate, and the second mold and the substrate can be easily installed, so that the lens can be manufactured at a low cost. can do.

  It is preferable that a protrusion is formed on at least one surface of the substrate.

  In this case, when the lenses are stacked, the protrusion can be used as a spacer. Thereby, the process for producing the spacer and the process for adjusting the position of the spacer are not required, and the lens can be manufactured at low cost.

  In addition, when the protrusions are formed on both surfaces of the substrate, it is possible to space the both surfaces of the substrate, increasing the degree of freedom in design and enabling design in a short period of time. .

  Furthermore, the substrate can be installed on the first mold and the second mold via the protrusion, and the first mold and the second mold can be easily installed on the substrate, so that the lens can be manufactured at a low cost. be able to. In addition, since the space between the substrate other than the protrusions and the first and second molds is a space, it is possible to easily extend the resin, and a highly accurate and highly reliable lens with less warpage. Can be provided.

  It is preferable that a protrusion is formed on at least one surface of the substrate, and the protrusion is formed of the resin.

  In this case, spacing can be achieved by the protrusions made of resin, the degree of freedom in design is increased, and design in a short period can be achieved. In addition, since it is not necessary to form a protrusion on the substrate, the substrate can be manufactured at low cost, and a lens can be manufactured at low cost.

  The substrate is preferably composed of a light shielding member.

  In this case, in the camera module using this lens, it is possible to prevent reflection of unwanted light (stray light). This prevents stray light from entering the image sensor of the camera module and enables high-quality imaging.

  The resin is preferably a delayed curable resin that cures with a delay from the time when the energy for curing the resin is irradiated.

  In this case, it is not necessary to use a thermoplastic or thermosetting resin, and the first mold and the second mold can be used without considering expansion deformation due to temperature rise of the first mold and the second mold during curing. It can be designed and a highly accurate lens can be manufactured in a short period of time.

  In addition, if a normal photocurable resin is used, a transparent first mold and a second mold are required, which increases the manufacturing cost. However, a metal mold can be used for delayed curing, A lens can be manufactured at low cost.

  A camera module manufacturing method according to the present invention is a camera module manufacturing method in which a lens array in which a plurality of lenses are arranged is stacked on a sensor array in which a plurality of light receiving elements are arranged. The lens manufacturing method according to any one of claims 1 to 6, wherein a plurality of lenses are formed on a single substrate, and the lens array is positioned in-plane with respect to the sensor array. After being adjusted, the sensor array and the lens array are stacked on the sensor array, and the stacked sensor array and the lens array correspond to the array direction of the plurality of light receiving elements in the sensor array. It cut | disconnects for every element and the said lens.

  In the camera module manufacturing method, a plurality of camera modules can be formed at the same time, so that the camera module can be manufactured at low cost.

  It is preferable that a protrusion is formed on at least one surface of the substrate, and the sensor array and the lens array are stacked with the protrusion interposed therebetween.

  In this case, since the distance between the lenses can be easily adjusted with high accuracy, a low-cost and highly reliable camera module can be manufactured.

  The lens according to the present invention includes a substrate having a through hole and a lens portion made of a resin filled in the through hole, and the resin extends to cover at least one surface of the substrate.

  In the lens described above, the resin covers at least one surface of the substrate, so that even if a variation in the thickness of the substrate occurs, the resin flows in to compensate for the variation. As a result, the lens thickness is determined by the alignment accuracy of the mold, and a lens having a high thickness accuracy can be provided.

  In addition, since the mold does not touch the substrate directly, it is possible to apply pressure to the resin during molding by sandwiching it with the mold, and to provide a lens with high accuracy and high resolution without being affected by resin shrinkage during curing. be able to.

  It is preferable that the resin further extends so as to cover a part of at least the other surface of the substrate.

  In this case, when one surface of the substrate is covered with resin and the resin contracts, a stress that warps the substrate is generated, but the occurrence can be suppressed by sandwiching both surfaces of the substrate with resin. Thereby, a lens with less internal stress can be formed, and a highly accurate and highly reliable (environmental resistance) lens can be provided.

  The substrate is preferably composed of a light shielding member.

  In this case, in the camera module using this lens, it is possible to prevent reflection of unwanted light (stray light). This prevents stray light from entering the image sensor of the camera module and enables high-quality imaging.

  In the case where the lens is included in the optical system, the substrate preferably constitutes a stop for light incident on the optical system.

  In this case, it is possible to provide a stop on the lens itself by using the substrate as the stop of the optical system. For this reason, it is possible to reduce the number of parts and to provide the lens at a lower cost than to provide a diaphragm with a separate member outside the lens. Further, since the substrate is used as a diaphragm, the optical system can be reduced in height, and a small lens, a lens array, a camera module, and an electronic device can be provided.

  The difference between the refractive index of the substrate and the refractive index of the lens portion is preferably −0.06 to 0.06.

  In this case, since the refractive index of the substrate and the refractive index of the lens unit are close to each other, unnecessary reflected light at the boundary surface between the substrate and the lens unit is suppressed. Therefore, it is possible to provide a high-quality lens, lens array, camera module, and electronic device that suppresses flare light and ghost. In particular, by setting the difference between the refractive index of the substrate and the refractive index of the lens portion to −0.06 to 0.06, the reflectance is reduced to 10% or less under the condition that the incident angle of incident light is less than 80 degrees. Can be reduced.

  It is preferable that a protrusion is formed on at least one surface of the substrate.

  In this case, when the lenses are stacked, the protrusion can be used as a spacer. Thereby, the process for producing the spacer and the process for adjusting the stress position of the spacer are not required, and the lens can be provided at low cost.

  The protrusion is preferably formed of the resin.

  In this case, spacing can be achieved by the protrusions made of resin, and the degree of freedom of design is increased, so that a lens that can be designed in a short period of time can be manufactured. Furthermore, since it is not necessary to form a protrusion on the substrate, the substrate can be manufactured at low cost, and a lens can be manufactured at low cost.

  The protrusion preferably has a tapered shape.

  In this case, when the mold and the lens are released, they can be released with a smaller force, and a highly productive lens can be provided.

  In addition, the shape deformation of the lens at the time of mold release can be reduced, and a highly accurate lens can be provided.

  A protrusion is formed on at least one surface of the substrate, the resin extends on a part of the surface on which the protrusion is formed, and the top surface of the protrusion is made of the resin. It is preferable that it is exposed.

  In this case, the substrate can be placed directly on the mold, and the lens thickness can be determined by the alignment accuracy of the mold. Therefore, it is possible to provide a lens having high thickness accuracy.

  It is preferable to have a square-shaped opening concentric with the lens portion when viewed from the optical axis direction of the lens portion.

  In this case, even when a plurality of lenses are formed in a lump and cut for individualization, since the protruding portion that is the cutting portion is linear, the cutting portion may be linear and the cutting efficiency is high. Therefore, a low-cost lens can be provided.

  The protrusion preferably has a circular opening concentric with the lens portion when viewed from the optical axis direction of the lens portion.

  In this case, the stress applied to the substrate by curing the resin can be made uniform at any position, and a lens with less bias of internal stress can be formed. High accuracy and high reliability (environment resistance) Lenses can be provided.

  The protrusions are preferably formed in a radial pattern centered on a point through which the optical axis of the lens unit passes when viewed from the optical axis direction of the lens unit.

  In this case, the stress applied to the substrate by curing the resin can be made uniform at any position, and a lens with less bias of internal stress can be formed. High accuracy and high reliability (environment resistance) Lenses can be provided.

  Further, since a space is formed between the substrate other than the protrusion and the mold, it is possible to easily extend the resin, and it is possible to provide a highly accurate and highly reliable lens with less warpage.

  The lens array according to the present invention is a lens array in which a plurality of the above lenses are arranged on the same substrate.

  In the lens array, a highly accurate lens array can be provided at a low cost.

  A camera module according to the present invention is a camera module in which the lens is incorporated.

  In the above camera module, a high-performance camera module can be provided at low cost by a high-precision lens and high-precision assembly.

  An electronic apparatus according to the present invention is an electronic apparatus in which the lens or the camera module is incorporated.

  In the electronic device, a high-performance electronic device can be provided at a low cost. For example, the above-described lens can be used as a lens for an optical pickup, and can be used for a device equipped with the optical pickup.

  In the lens manufacturing method according to the present invention, as described above, when the surface of the substrate facing the first mold is the first surface, the resin fills the through hole of the substrate and The pressure is applied until the first mold and the second mold reach a predetermined distance so that the resin extends at least on the first surface, so that the resin covers the first surface of the substrate, and the substrate Even if a thickness variation occurs, the resin flows in to compensate for the variation. For this reason, the lens thickness is determined by the positioning accuracy of the first and second molds, and a lens having a high thickness accuracy can be manufactured.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected to the same part, and what attached the same code | symbol in drawing may abbreviate | omit description.

(Embodiment 1)
FIG. 1 is a process cross-sectional view for explaining a processing procedure of the lens manufacturing method according to the first embodiment of the present invention. Although FIG. 1 shows a process cross-sectional view in the case where a plurality of (three in the drawing) lenses are manufactured at the same time, a manufacturing method for forming a single lens can be similarly realized.

  In FIG. 1A, the substrate 2 is disposed on the main surface of the lower mold 20. Here, after the position of the substrate 2 is adjusted in the in-plane direction of the lower mold 20, the substrate 2 is disposed on the main surface of the lower mold 20. At this time, as shown in FIG. 1A, the back surface (second surface) of the substrate 2 and the main surface of the lower mold 20 come into contact with each other.

  A plurality of convex optical transfer surfaces 40 are formed at regular intervals on the main surface of the lower mold 20, and a flat portion 41 is further provided between the adjacent optical transfer surfaces 40 on the main surface. Is formed. The lower mold 20 is made of, for example, a hard mold member, and is made of, for example, metal, quartz, or glass.

  The substrate 2 has a plate shape and is provided with a plurality of through holes 4 penetrating the substrate 2. Each of the through holes 4 is formed to have a one-to-one correspondence with each of the optical transfer surfaces 40 of the lower mold 20 when the substrate 2 is disposed on the lower mold 20. The position of the substrate 2 and the lower mold 20 is adjusted in the in-plane direction so that the respective centers of the corresponding optical transfer surface 40 and the through hole 4 coincide in the optical axis direction.

  On the main surface (first surface) of the substrate 2, the protrusions 3 are formed in each of the regions between the adjacent through holes 4. The protrusion 3 can have an effect as a spacer for maintaining a distance between lenses when a plurality of lenses are used in an overlapping manner. Further, the protrusion 3 does not have a shape protruding in the vertical direction with respect to the main surface of the substrate 2, and has a side surface that is inclined with respect to the vertical direction. The effect resulting from this shape will be described later.

  Furthermore, the upper surface of the protrusion 3 is flat, and even if another lens is stacked on the protrusion 3, the other lens can be disposed without being inclined.

  In FIG. 1B, an energy curable resin 43 (hereinafter simply referred to as “resin 43”) is applied on the main surfaces of the lower mold 20 and the substrate 2. Here, as shown in FIG. 1B, the resin 43 is filled in the through hole 4 of the substrate 2, and the resin 43 filled in the through hole 4 finally constitutes the lens portion. . For this reason, it is preferable that the resin 43 has been defoamed in advance so as not to include bubbles, and the defoaming process is preferably a vacuum defoaming process or a defoaming process by centrifugal force. Moreover, it is preferable to perform a vacuum defoaming process after application | coating. By performing such processing, it is possible to mold the lens part without embedding air bubbles when molding the lens part.

  Further, the amount of the resin 43 applied is preferably about the amount obtained by subtracting the volume of the substrate 2 from the cavity region formed by the upper mold 21 and the lower mold 20 described later. Thereby, at the time of molding the lens portion, the amount of the resin 43 leaking out from the mold including the upper mold 21 and the lower mold 20 can be minimized, and the manufacturing cost can be reduced.

  In FIG. 1C, the upper mold 21 is disposed on the main surface of the substrate 2. Here, first, after the upper mold 21 is disposed above the main surfaces of the lower mold 20 and the substrate 2, the position of the upper mold 21 is adjusted in the in-plane direction on the lower mold 20 and the substrate 2. As shown in FIG. 1C, a plurality of optical transfer surfaces 44 are formed on the main surface of the upper mold 21, and the center of each is the center of each of the corresponding through hole 4 and optical transfer surface 40. Position adjustment between the lower mold 20 and the substrate 2 and the upper mold 21 is performed so as to coincide with the center in the optical axis direction.

  Similarly to the lower mold 20, the upper mold 21 is formed of, for example, a hard mold member, and is composed of, for example, metal, quartz, or glass.

  In FIG.1 (d), the upper mold | type 21 which is a movable mold | type descends below a paper surface toward the lower mold | type 20, and when the space | interval of a mutual becomes the designated distance, it will be fixed. The distance between the upper die 21 and the lower die 20 is equivalent to the lens thickness calculated by the optical design. Although not shown, a mechanism for controlling the distance between the upper mold 21 and the lower mold 20 is connected to the upper mold 21 and the lower mold 20.

  As shown in FIG. 1 (d), the upper mold 21 and the substrate 2 are not in contact with each other, and the resin 43 exists in all regions between the upper mold 21 and the substrate 2. That is, the distance between the upper mold 21 and the lower mold 20 is set to be larger than the thickness of the substrate 2 at each position in the region between the upper mold 21 and the lower mold 20. Therefore, as a matter of course, the region corresponding to the protrusion 3 of the substrate 2 in the main surface of the upper mold 21 has a concave shape in accordance with the protrusion 3.

  Due to the structure of the upper mold 21 and the lower mold 20, even if the thickness of the substrate 2 varies, the thickness of the lens portion formed in the through hole 4 of the substrate 2 is adjusted only by the thickness of the resin 43, It does not depend on the thickness of the substrate 2. For this reason, it is possible to form the lens portion with a constant thickness, and it is possible to assemble the distance between the lenses with high accuracy only by stacking the lenses at the time of assembly described later. At the same time, the resin 43 is sealed with rubber packing (not shown), so that the force generated by the movement of the upper mold 21 is equally applied as pressure to the resin 43, and the optical transfer surface of the lower mold 20. Surface transfer by the optical transfer surface 44 of 40 and the upper die 21 can be performed with high accuracy.

  In FIG. 1D, the resin 43 is cured. Here, if the resin 43 is a delayed curable resin, energy (UV light) is given to the resin 43 in the resin application or the upper mold arrangement. For this reason, the resin 43 is cured by leaving the resin 43 for a predetermined time in the state shown in FIG.

  When the resin 43 is the delayed curable resin, energy (UV light) can be applied to the resin 43 before the upper mold 21 and the lower mold 20 are fixed. The lower mold 20 can be formed of a hard mold member. In this case, relatively inexpensive members can be used for the upper mold 21 and the lower mold 20, and the manufacturing cost can be reduced. Note that the delayed-curing resin is a resin characterized by having a certain period of time from application of energy to curing.

  On the other hand, if the resin 43 is a photocurable resin, no energy is given to the resin 43 in the resin application or the upper mold arrangement. This is because if energy is applied to the resin 43 in the resin application or the upper mold arrangement, the resin 43 is cured before fixing between the upper mold 21 and the lower mold 20. For this reason, the resin 43 is cured by applying energy to the resin 43 through the upper mold 21 or the lower mold 20 in the state shown in FIG.

  Specifically, when the resin 43 is the photocurable resin, the lower mold 20 or the upper mold 21 is made of a transparent member such as quartz, and the transparent member mold is used in the state shown in FIG. The resin 43 is irradiated with UV light through either the lower mold 20 or the upper mold 21 and cured.

  If the resin 43 is a thermosetting resin, the temperature of the lower mold 20 and the upper mold 21 may be raised in the state shown in FIG.

  In FIG. 1E, the lens array 70 is released from the lower mold 20 and the upper mold 21 by moving the upper mold 21 again upward in the drawing. At this time, it is preferable that the surfaces of the main surfaces of the lower mold 20 and the upper mold 21 are coated with a fluorine-based or silicone-based release agent. By doing so, the lens array 70 can be easily released from the lower mold 20 and the upper mold 21.

  Further, as described above, the protruding portion 3 has a side surface that is inclined with respect to the vertical direction. For this reason, when releasing from the upper mold | type 21, it acts as a draft and can release easily.

  Moreover, since the surface of the main surface of the lower mold | type 20 contacts the board | substrate 2, you may perform various metal mold | die coatings, such as a fluorine-containing DLC (Diamond Like Carbon).

  On the other hand, the surface of the main surface of the substrate 2 is preferably subjected to a surface treatment that increases the adhesion with the resin 43. For example, a method for roughening the surface by plasma treatment, a method for imparting hydroxyl groups to the surface by corona discharge, and a method for imparting chemical bonds by silane coupling treatment can be appropriately selected and used depending on the material.

  As described above, the lens array 70 can be easily integrated and released from the lower mold 20 and the upper mold 21 by the mold release process of the lower mold 20 and the upper mold 21 and the contact process of the substrate 2.

  In the present embodiment, the optical transfer surface 40 of the lower mold 20 and the optical transfer surface 44 of the upper mold 21 are not limited to the meniscus shape shown in FIG. 1, but are biconvex, biconcave, planoconvex, Any shape having a plano-concave shape can be formed. The optical transfer surfaces 40 and 44 are for realizing the lens shape of the lens portion formed in the through hole 4 of the substrate 2, and the required lens shape is expressed by a design formula derived by optical system design. Shape.

  In the present embodiment, the diameter of the optical transfer surfaces 40 and 44 is not limited to be smaller than the diameter of the through hole 4 of the substrate 2. May be large.

  In the present embodiment, the variation in the distance between the lens portions due to the curing shrinkage of the resin 43 can be cut off by the interposition of the substrate 2, and the accuracy between the lens distances can be kept high. Further, there is an effect that the resin 43 having low strength is reinforced by the substrate 2 having high strength. Thereby, it is possible to provide a lens array in which a plurality of lenses with good handling properties are arranged, and to suppress the warpage of the lens array.

  In the present embodiment, the substrate 2 may be a light shielding member. In this case, when the lens is assembled as a camera module, light beams from other than the effective field angle can be blocked by the substrate 2. Therefore, there is an effect of reducing flare light and ghost which are unnecessary light as a camera module.

  Here, the above case is compared with the case where the unnecessary light is shielded by using a light shielding ring. Since the position of the light shielding ring cannot be adjusted and is assembled by dropping between lenses, it is not possible to make a light shielding region concentrically around the center of the optical axis and near the optical effective diameter. On the other hand, according to the present embodiment, the position of the lens, that is, the position of the optical transfer surface 40 and the position of the through hole 4 of the substrate 2 can be adjusted in advance, so that the light shielding region is closer to the optical effective diameter. A light shielding region can be provided. Further, light can be shielded on the side surface of the substrate 2 and can be shielded in three dimensions.

  Therefore, the number of light beams that can be blocked is increased compared to the light blocking ring method, and a light blocking member integrated lens that suppresses flare light and ghost can be provided.

  Here, with reference to FIG. 13 and FIG. 14, the relationship between the incident angle of the light beam, its reflectance, and the refractive index of the light guide medium will be described. When the light ray enters the transmissive material B from the transmissive material A, the incident angle θi of the light beam reflected at the boundary surface between the transmissive material A and the transmissive material B and the s-polarized component (component perpendicular to the boundary surface) The reflectances Rs and Rp of the p-polarized component (component parallel to the boundary surface) are expressed by the following equations.

  Here, ni is the refractive index of the transmissive substance A, nt is the refractive index of the transmissive substance B, θi is the incident angle, and θt is the outgoing angle. In the following, a case is considered where the light beam that has passed through the lens resin (ni = 1.5) is incident on the substrate (nt = 1.7).

  In the case of a substance having a light absorption property such as a lens resin or a substrate, the refractive index thereof is generally expressed using a complex refractive index obtained by adding the absorption rate to the imaginary part. However, since the lens resin, the substrate, and the like are materials having a relatively small light absorption coefficient, here, the refractive index is calculated using only the real part without considering the absorption rate.

  Under the above conditions, as shown in FIG. 13, as the incident angle θi of the light beam (wavelength λ = 800 nm) increases, the reflectances Rs and Rp increase and the causes of flare light and ghost increase.

  On the other hand, the reflectances Rs and Rp can be reduced by making the refractive indexes of the lens resin and the substrate close to each other. That is, as shown in FIG. 14, by setting the refractive index nt of the substrate to nt = 1.56 with respect to the refractive index ni = 1.5 of the lens resin, reflection is possible even when the incident angle θi reaches 80 degrees. The rates Rs and Rp are both 10% or less, and it can be seen that the increase in the reflectivity Rs and Rp is suppressed compared to the above case. Therefore, flare light and ghost can be suppressed, and a high-quality camera module can be provided.

  In the present embodiment, examples of the material of the substrate 2 include PEEK (Poly Ether Ether Ketone), LCP (Liquid Crystal Polymer), PA (Poly Amide), and engineering plastics such as phenol. If the substrate 2 has heat resistance, a thermosetting resin and a thermoplastic resin can be used as the resin 43. Furthermore, if the substrate 2 and the resin 43 are materials having a heat resistance of 250 ° C. or higher, a solder reflow process can be performed, and a camera module described later and a circuit board that drives the camera module are connected at low cost. Can do. Of course, the material of the board | substrate 2 is not restricted to the said material, Another material may be sufficient.

  In this embodiment, the compression molding technique is used as the lens molding method, but the present invention is not limited to this, and for example, an injection compression molding technique may be used. In the injection compression molding method, the upper mold is fixed in advance at a position opened in the thickness direction from the desired shape to form a cavity. Thereafter, the resin is injected into the cavity to hold the pressure, and the upper mold is moved to a desired position to compress and mold the resin. By using this injection compression molding method, transferability of the optical surface can be improved as compared with the compression molding method.

(Embodiment 2)
Next, a second embodiment of the present invention will be described. In the present embodiment, a substrate having a shape different from that of the substrate 2 is used in place of the substrate 2 of the first embodiment. Since others are the same as in the first embodiment, description thereof will not be repeated.

  FIG. 2 is a process cross-sectional view for explaining the processing procedure of the lens manufacturing method according to the second embodiment of the present invention. FIG. 2 corresponds to the state of FIG. 1D of the first embodiment.

  In the present embodiment, as shown in FIG. 2, a protrusion 13 and a protrusion 16 are provided on each of the main surface and the back surface of the substrate 12. That is, in the first embodiment, as shown in FIG. 1, the protrusion 3 is provided only on the main surface facing the upper mold 21. On the other hand, in the present embodiment, as shown in FIG. 2, in addition to providing the protrusion 13 on the main surface facing the upper mold 23, the protrusion 16 is also provided on the back surface facing the lower mold 22. . And the area | region corresponding to the projection part 16 among the main surfaces of the lower mold | type 22 becomes concave shape matched with the projection part 16. As shown in FIG.

  With the above configuration, when a plurality of lenses are stacked, spacing by the protrusions 13 and 16 on the main surface and the back surface of the substrate 12 is possible, and the lens 12 is stacked on both the main surface and the back surface of the substrate 12. The space between the lens and the lens can be set with high accuracy, and the position adjustment of the spacer on the surface of the substrate 12 becomes unnecessary. For this reason, the freedom degree of optical design can be raised. Further, since the flat surface of the protrusion 16 can be disposed on the flat surface of the main surface of the lower mold 22, the parallelism between the lower mold 22 and the substrate 12 can be maintained.

  Further, the substrate 12 is covered with the resin 43 except for the flat surface of the protrusion 16. Therefore, as compared with the configuration in which the resin 43 is extended only on the main surface side of the substrate 2 as in the first embodiment, the direction of the warp of the entire lens array is canceled and a lens array with a smaller warp amount is provided. can do.

  Here, the protrusions 13 and 16 have a symmetric structure, but may have an asymmetric structure. Further, the protrusions 13 and 16 have a structure in which the cross section becomes narrower toward the outside of the substrate. Accordingly, the upper mold 23 and the lower mold 22 can enter the substrate 12.

(Embodiment 3)
Next, a third embodiment of the present invention will be described. In the present embodiment, as in the second embodiment, a substrate having a shape different from that of the substrate 2 is used instead of the substrate 2 in the first embodiment. Since others are the same as in the first embodiment, description thereof will not be repeated.

  FIG. 3 is a process cross-sectional view for explaining the processing procedure of the lens manufacturing method according to the third embodiment of the present invention. FIG. 3 corresponds to the state of FIG. 1D of the first embodiment.

  In the present embodiment, as shown in FIG. 3, the protrusion 18 is provided only on the back surface of the substrate 28. That is, in the first embodiment, as shown in FIG. 1, the protrusion 3 is provided only on the main surface facing the upper mold 21. On the other hand, in the present embodiment, as shown in FIG. 3, the protrusion 18 is provided only on the back surface facing the lower mold 24.

  According to the present embodiment, it is possible to accurately set the space between the laminated lenses on the back surface of the substrate 28, and it is not necessary to adjust the position of the spacer on the back surface of the substrate 28. For this reason, the freedom degree of optical design can be raised. In addition, since the flat surface of the protrusion 18 can be disposed on the flat surface of the main surface of the lower mold 24, the parallelism between the lower mold 24 and the substrate 28 can be maintained.

(Embodiment 4)
Next, a fourth embodiment of the present invention will be described. In the present embodiment, as in the second and third embodiments, a substrate having a shape different from that of the substrate 2 is used instead of the substrate 2 in the first embodiment. Since others are the same as in the first embodiment, description thereof will not be repeated.

  FIG. 4 is a process cross-sectional view for explaining the processing procedure of the lens manufacturing method according to the fourth embodiment of the present invention. FIG. 4 corresponds to the state of FIG. 1D of the first embodiment.

  In the present embodiment, as shown in FIG. 4, no protrusion is provided on either the main surface or the back surface of the substrate 29. That is, in the first embodiment, as shown in FIG. 1, the protrusion 3 is provided only on the main surface facing the upper mold 21. On the other hand, in the present embodiment, as shown in FIG. 3, no protrusion is provided on the main surface facing the upper mold 27.

  According to the present embodiment, since the upper mold 27 and the lower mold 26 can be arranged on a flat surface on both the main surface and the back surface of the substrate 29, the parallelism between the upper mold 27 and the lower mold 26 and the substrate 29. Can keep.

  In the first to fourth embodiments, a through hole is provided in the substrate, an optical transfer surface is provided in the through hole region, and one surface of the substrate is completely made of resin in order to ensure a degree of design freedom. It is characterized in that a part of the other surface of the substrate is not covered with resin. Therefore, the structure of the present invention other than the first to fourth embodiments has the effect of the present invention.

(Embodiment 5)
Next, a fifth embodiment of the present invention will be described. The present embodiment is a form according to the lens array cutting method of the first to fourth embodiments. By cutting each lens array of Embodiments 1 to 4 for each lens, a single lens can be realized.

  FIG. 5 is a diagram for explaining a method of cutting the lens array 70 shown in FIG. That is, as shown in FIG. 5A, by cutting the lens array 70 along the cutting surface 90 by a wire cutting method or the like, the lens array 70 is made up of a plurality of single pieces as shown in FIG. A lens 50 that is individualized as the lens 50 and has a light shielding member can be obtained.

  FIG. 6 is a diagram for explaining a method of cutting the lens array 71 shown in FIG. That is, as shown in FIG. 6A, by cutting the lens array 71 along the cutting surface 90 by a wire cutting method or the like, the lens array 71 is made up of a plurality of single pieces as shown in FIG. It is possible to obtain a lens 51 that is individualized as the lens 51 and has a light shielding member.

  The same applies to the lens array 72 of FIG. 3 and the lens array 73 of FIG.

  As a cutting method common to the lens arrays 70 to 73, a single-sided light shielding member-integrated lens can be manufactured by cutting along a cutting surface 90 along the protrusion. When the cutting surface is constituted by a plurality of members, a plurality of tools for cutting are generally required. On the other hand, in the present embodiment, the cut surface 90 is a surface along the protrusion, so that the resin 43 in contact with the protrusion is a thin film in any of the lens arrays of the first to fourth embodiments. Therefore, the cut surface 90 can be regarded as substantially only the substrate. For this reason, regardless of the above general rule, in the present embodiment, cutting with a single tool is possible, and the number of steps can be reduced, so that it can be manufactured at low cost.

  Furthermore, when cutting, physical impact and thermal impact are applied to the cut surface, but since this impact is applied only to the substrate member, the influence on the lens part which is the optical surface can be reduced, and high quality. A lens can be manufactured.

  Next, the lens 50 in FIG. 5B will be further described. FIG. 7 is a top view illustrating each configuration example of the lens 50. Here, only the lens portion formed by the optical transfer surfaces 40 and 44 and the projection portion 3 provided on the main surface of the substrate 2 are shown for easy understanding of the drawing.

  In the configuration example shown in FIG. 7A, a protrusion 3a having a circular opening centering on the optical axis direction of light passing through the lens portion 1a formed by the optical transfer surfaces 40 and 44 is formed. . As shown in FIG. 7A, the opening of the protrusion 3a is provided so as to be larger than the effective diameter of the lens 1a, and its circular shape is concentric with the lens 1a.

  In this case, since the protrusion 3a has a point-symmetric shape with the optical axis as the center, the stress when the resin 43 is cured and contracted becomes uniform, and there is an effect of suppressing the distortion of the shape of the lens portion 1a due to the stress.

  In the configuration example shown in FIG. 7B, a protrusion 3b having a square-shaped opening centering on the optical axis direction of light passing through the lens portion 1b formed by the optical transfer surfaces 40 and 44 is formed. . As shown in FIG. 7B, the opening of the protrusion 3b is provided so as to be larger than the effective diameter of the lens 1b, and its square shape is concentric with the lens 1b.

  Also in this case, since the protrusion 3b has a point-symmetric shape with the optical axis as the center, the stress when the resin 43 cures and shrinks becomes uniform, and there is an effect of suppressing the distortion of the shape of the lens portion 1b due to the stress. .

  In the configuration example shown in FIG. 7C, the protrusion 3b is formed around the optical axis direction of the light passing through the lens portion 1c formed by the optical transfer surfaces 40 and 44. However, unlike the configuration example shown in FIGS. 7A and 7C, the projection 3c surrounding the lens 1c is divided into a plurality of parts.

  Even in this case, since the protrusion 3c has a point-symmetric shape with the optical axis as the center, the stress when the resin is cured and shrunk becomes uniform, and the effect of suppressing the distortion of the shape of the lens portion 1c due to the stress. There is.

  Furthermore, since the protrusion 3c is divided into a plurality of parts, adjacent lenses are connected without the protrusion 3c in the lens array state before cutting. For this reason, the resin 43 before curing can freely flow between adjacent lenses without passing through the protrusions 3c, can prevent unfilling of the resin 43, and manufacture a lens array 70 with a high yield rate.

  Even in the configuration example of FIG. 7D, the same effect as the configuration example of FIG. 7C can be obtained.

(Embodiment 6)
Next, a sixth embodiment of the present invention will be described. The present embodiment is a form according to the camera module using the lens array of the first to fourth embodiments. FIG. 8 is a cross-sectional view showing the configuration of the camera module array according to the sixth embodiment of the present invention.

  As shown in FIG. 8, the camera module array 75 according to the present embodiment includes a lens array 70, a lens array 72, and a sensor array 60. Here, the lens array 70 of the first embodiment and the lens array 72 of the third embodiment are used, but the present embodiment is not limited to this.

  The sensor array 60 includes a sensor substrate 61, a sensor chip 62 disposed on the main surface of the sensor substrate 61, an internal wiring 63a that electrically connects the sensor chip 62 and the back side of the sensor substrate 61, and an internal wiring. And an external terminal 63b connected to 63a. The main surface side of the sensor substrate 61 is sealed with a sealing resin 64. In the sensor array 60, a plurality of sensors are integrally formed in a plate shape, and the sensor chip interval is constant.

  The lens array 70 in which lenses are formed at the same interval as the sensor chip interval is adjusted in the in-plane direction so that the center of the sensor chip and the lens center coincide with each other, and is arranged on the sensor array 60 via the protrusion 3. At this time, the protrusion 3 functions as a spacer and can determine the distance between the sensor chip 62 and the lens portion. For this reason, it is not necessary to manufacture and arrange a spacer as a separate member, the number of processes and the number of parts can be reduced, and it can be provided at low cost.

  Further, the lens array 72 is arranged on the lens array 70 after adjusting the position in the in-plane direction. Accordingly, the distance between the lenses can be maintained with high accuracy without using a spacer, and the camera module can be assembled more easily.

  As described above, by cutting the assembled camera module array 75 at the cutting surface 90, a plurality of individual camera modules can be obtained. Further, as shown in FIG. 8, a high-quality camera module can be obtained by providing a diaphragm 77 on the upper part of the camera module array 75.

  As described above, two lens arrays 70 and 72 are used as a combination of lens arrays. However, the present invention is not limited to this, and it goes without saying that various combinations of lens array shapes can be taken depending on the design. .

  Needless to say, the number of lens arrays is not limited to two, and may be one lens array or three or more, depending on the design.

  Needless to say, the position of the diaphragm 77 is not limited to the subject side, and may be placed between the lens arrays.

  Furthermore, if the substrate is a light-shielding member and the substrate is regarded as having a light-shielding effect, the use of the substrate-integrated lens according to the present invention is limited for all the lenses constituting the camera module. For example, in a three-lens configuration, the substrate-integrated lens according to the present invention is used as the second lens (center), and the other first lens (object side) and third (image surface side) are used. The lens may be a lens that does not include a substrate.

  At that time, since the number of lenses including the substrate is reduced, it is possible to provide a degree of freedom in design and to provide a camera module at a low cost. In addition, if the lens has a three-lens configuration and has a diaphragm on the most object side, unnecessary rays outside the angle of view are removed by the diaphragm. Therefore, the first lens is not necessarily a substrate-integrated lens according to the present invention. There is no need to use the second lens and / or the third lens as a substrate-integrated lens to block light rays caused by inter-lens reflection, thereby suppressing the occurrence of ghosts and flares and obtaining a high-quality camera module. it can.

  In summary, if the substrate is limited to a light-shielding member and the substrate is regarded as having a light-shielding effect, the lens immediately after the diaphragm does not need to be a substrate-integrated lens according to the present invention, and the image plane thereafter. The lens on the side may include at least one substrate-integrated lens according to the present invention.

  In an optical system in which no diaphragm is separately provided, the same effect as that provided by the diaphragm can be obtained by using the first lens (image surface side) as the substrate-integrated lens having the light shielding effect according to the present invention. .

  Here, the shape of the lens array is not limited to the meniscus shape, and a biconvex shape, a biconcave shape, a plano-convex shape, and a plano-concave shape can also be formed.

  In the present embodiment, a diaphragm 77 separate from the lens array 72 is provided above the camera module array 75, but the present invention is not limited to this configuration. For example, the lens array 70 or the substrate constituting the lens array 72 may be used as a diaphragm. This configuration will be described in Embodiment 9 described later.

(Embodiment 7)
Next, a seventh embodiment of the present invention will be described. FIG. 9 is a process cross-sectional view for explaining the processing procedure of the lens manufacturing method according to the seventh embodiment of the present invention. FIG. 9 corresponds to the state of FIG. 1D of the first embodiment. For ease of illustration, the upper mold and the lower mold are omitted.

  In the present embodiment, the size relationship between the diameter of the optical transfer surface of each of the upper mold and the lower mold in the lens array of the first embodiment and the diameter of the through hole of the substrate is changed. That is, in the first embodiment, as shown in FIG. 1, the diameters of the optical transfer surface 44 of the upper mold 21 and the optical transfer surface 40 of the lower mold 20 are made smaller than the diameter of the through hole 4 of the substrate 2. Was set to. On the other hand, in this embodiment, as shown in FIG. 9, the diameters of the upper mold optical transfer surface 46 and the lower mold optical transfer surface 45 are set to be larger than the diameter of the through hole 4 of the substrate 32. ing.

  In this case, this can increase the degree of freedom in design. Further, in addition to the resin 8 extending on the main surface of the substrate 2, a resin protrusion region 7 is also provided on the back surface in the vicinity of the through hole 4. By having the resin protrusion area 7, the area where the substrate 2 is covered with the resin is increased, and the direction of the warp of the entire lens array is offset, and a lens array with a smaller warp amount can be provided.

  Here, the shape of the lens 52 is not limited to the meniscus shape, and a biconvex shape, a biconcave shape, a plano-convex shape, and a plano-concave shape can also be formed. The optical transfer surfaces 45 and 46 are designed according to the optical system design. The shape is represented by the derived design formula.

(Embodiment 8)
Next, an eighth embodiment of the present invention will be described. In this embodiment, instead of the protrusion provided on the substrate of the lens array in the first embodiment, a protrusion using resin by transfer of the resin shape by the upper mold or the lower mold is formed. is there. FIG. 10 is a process cross-sectional view for explaining the processing procedure of the lens manufacturing method according to the eighth embodiment of the present invention. FIG. 10 corresponds to the state of FIG. 1D of the first embodiment. For ease of illustration, the upper mold and the lower mold are omitted.

  In the present embodiment, no protrusion is provided on the main surface of the substrate 33, but instead, a protrusion 19 a made of resin 43 is formed on the main surface of the substrate 33. A region corresponding to the protrusion 19a in the main surface of the upper mold has a concave shape in accordance with the protrusion 19a.

  Thereby, the lens thickness can be controlled with high accuracy, and a spacer function can be provided when the lenses are stacked. Further, since it is not necessary to provide a protrusion on the substrate 33 itself, a low-cost substrate can be used as the substrate 33.

  Here, the structure of the lens 53 is not limited to the configuration in which the protruding portion is formed on the surface with the extending resin, and the protruding portion can be formed on the other surface with respect to the surface having the extending resin. It is.

  In addition, as shown in FIG. 11, it is possible to form protrusions 19 a and 19 b made of resin 43 on both the main surface and the back surface of the substrate 33. As a result, the effect of increasing the degree of freedom in design is obtained.

  Here, the shape of the lens 54 is not limited to the meniscus shape, and a biconvex shape, a biconcave shape, a plano-convex shape, and a plano-concave shape can be formed, and the optical transfer surface is derived by the optical system design. The shape is represented by a design formula.

  In the seventh and eighth embodiments, both the main surface and the back surface of the substrates 2 and 33 are encased in the resin 43. For this reason, it is possible to prevent the lens portion from being peeled off from the substrates 2 and 33 and to provide a substrate-integrated lens having high impact resistance.

(Embodiment 9)
Next, a ninth embodiment of the present invention will be described. As described above, the present embodiment is a form in which the diaphragm, which is a separate body from the lens in the sixth embodiment, is realized by the substrate constituting the lens. FIG. 12 is a sectional view showing a configuration of a camera module array according to the ninth embodiment of the present invention.

  The camera module array 95 according to the present embodiment includes a lens array 91, a lens array 92, a lens array 93, and a sensor array 60. In FIG. 12, only a single camera module constituting the camera module array 95 is shown.

  In the camera module array 95 of the present embodiment, a diaphragm 94 is formed using the substrate of the lens array 91 arranged closest to the subject. Here, the lens array 91 substrate is a light shielding member.

  According to the present embodiment, by forming the diaphragm 94 using the substrate of the lens array 91, the number of components can be reduced and the camera module can be manufactured at a lower cost than when the diaphragm is provided as a separate member outside the lens array. An array 95 can be provided. Further, since the substrate of the lens array 91 is used as the diaphragm 94, the camera module 95 can be reduced in height. For this reason, the electronic device in which the camera module array 95 is mounted can be reduced in size.

  In the present embodiment, the diaphragm 94 is formed using the substrate of the lens array 91 arranged closest to the object side. However, the diaphragm is formed using the lens array 92 or the substrate of the lens array 93. Of course it doesn't matter.

  The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope shown in the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments. Is also included in the technical scope of the present invention.

  According to the present invention, it is possible to provide a camera module having high performance using a simple and inexpensive method, and therefore, the present invention can be applied to all optical devices for forming an image based on light from a subject. . In particular, it is effective to apply to a camera module for a mobile phone, a digital camera, and the like. It can be used for the purpose of downsizing, thinning and widening the device.

It is process sectional drawing for demonstrating the process sequence of the manufacturing method of the lens concerning Embodiment 1 of this invention. It is process sectional drawing for demonstrating the process sequence of the manufacturing method of the lens concerning Embodiment 2 of this invention. It is process sectional drawing for demonstrating the process sequence of the manufacturing method of the lens concerning Embodiment 3 of this invention. It is process sectional drawing for demonstrating the process sequence of the manufacturing method of the lens concerning Embodiment 4 of this invention. It is a figure for demonstrating the cutting method of the lens array of FIG. It is a figure for demonstrating the cutting method of the lens array of FIG. It is a top view which shows the structural example of a lens. It is sectional drawing which shows the structure of the camera module array concerning Embodiment 6 of this invention. It is process sectional drawing for demonstrating the process sequence of the manufacturing method of the lens concerning Embodiment 7 of this invention. It is process sectional drawing for demonstrating the process sequence of the manufacturing method of the lens concerning Embodiment 8 of this invention. It is process sectional drawing for demonstrating the process sequence of the manufacturing method of the other lens concerning Embodiment 8 of this invention. It is sectional drawing which shows the structure of the camera module array concerning Embodiment 9 of this invention. It is a graph which shows the relationship between the incident angle of a light ray, and a reflectance. It is a graph which shows the other relationship between the incident angle of a light ray, and a reflectance. It is sectional drawing which shows the structure of the conventional lens array. It is sectional drawing which shows the structure of the conventional lens.

Explanation of symbols

1a, 1b, 1c, 1d, 101, 202 Lens part 2, 12, 28, 29, 32, 33 Substrate 3, 3a, 3b, 3c, 3d, 13, 16, 18, 19a, 19b Projection part 4 Through-hole 7 Resin protrusion area 8, 43 Resin 20, 22, 24, 26 Lower mold (first mold)
21, 23, 25, 27 Upper mold (second mold)
40, 44, 45, 46, 47, 48 Optical transfer surface 41 Flat portion 50, 50a, 50b, 50c, 50d, 51, 52, 53, 54, 103, 200 Lens 60 Sensor array 61 Sensor substrate 62 Sensor chip 63a Inside Wiring 63b External terminal 64 Sealing resin 70, 72, 73, 91, 92, 93, 100 Lens array 75, 95 Camera module array 77, 94 Aperture 90 Cut surface 102 Lens substrate 104 Image sensor 105 Spacer 110 Camera module 201 Light shielding lens frame

Claims (23)

A substrate disposing step of disposing a substrate having a through hole on the second mold;
A resin injection step of injecting a resin onto the substrate disposed in the second mold;
A pressing step of applying pressure by a first mold from the side where the resin is injected;
A resin curing step of curing the resin in a state where the pressure is applied,
When the surface of the substrate facing the first mold is the first surface,
In the pressing step, the first mold and the second mold are predetermined so that the resin fills the through hole of the substrate and the resin extends on at least the first surface of the substrate. A lens manufacturing method, wherein pressure is applied until a distance is reached. When the surface facing the second mold in the substrate is the second surface,
The lens manufacturing method according to claim 1, wherein the resin extends on the second surface of the substrate except for a contact surface with the second mold.   The lens manufacturing method according to claim 1, wherein a protrusion is formed on at least one surface of the substrate.   The lens manufacturing method according to claim 3, wherein the protrusion is formed of the resin.   The lens manufacturing method according to claim 1, wherein the substrate is made of a light shielding member.   The lens manufacturing method according to claim 1, wherein the resin is a delayed curable resin that is delayed and cured from the time when energy for curing the resin is irradiated. . A method of manufacturing a camera module in which a lens array in which a plurality of lenses is arranged is stacked on a sensor array in which a plurality of light receiving elements are arranged.
The lens array is obtained by forming a plurality of lenses on a single substrate using the lens manufacturing method according to any one of claims 1 to 6.
The lens array is laminated on the sensor array after in-plane position adjustment with respect to the sensor array,
The stacked sensor array and lens array are cut for each of the corresponding light receiving elements and lenses according to the arrangement direction of the plurality of light receiving elements in the sensor array. Production method. A protrusion is formed on at least one surface of the substrate,
The method of manufacturing a camera module according to claim 7, wherein the sensor array and the lens array are stacked with the protrusion interposed therebetween. A substrate having a through hole;
A lens portion made of a resin filled in the through hole,
The lens, wherein the resin extends so as to cover at least one surface of the substrate.   The lens according to claim 9, wherein the resin further extends so as to cover a part of at least the other surface of the substrate.   The lens according to claim 9 or 10, wherein the substrate is made of a light shielding member.   The lens according to claim 9, wherein, when the lens is included in an optical system, the substrate constitutes a diaphragm of light incident on the optical system. .   The lens according to claim 9, wherein a difference between a refractive index of the substrate and a refractive index of the lens unit is −0.06 to 0.06.   The lens according to claim 9, wherein a protrusion is formed on at least one surface of the substrate.   The lens according to claim 14, wherein the protrusion is formed of the resin.   The lens according to claim 14, wherein the protrusion has a tapered shape. A protrusion is formed on at least one surface of the substrate, and the resin extends on a part of the surface on which the protrusion is formed,
The lens according to claim 9, wherein a top surface of the protrusion is exposed from the resin.   The lens according to any one of claims 14 to 17, wherein the protrusion has a square-shaped opening concentric with the lens portion when viewed from the optical axis direction of the lens portion.   The lens according to claim 14, wherein the protrusion has a circular opening concentric with the lens portion when viewed from the optical axis direction of the lens portion.   18. The projection according to claim 14, wherein the protrusion is formed in a radial shape centered on a point through which the optical axis of the lens unit passes when viewed from the optical axis direction of the lens unit. The lens described in 1.   A lens array in which a plurality of the lenses according to any one of claims 9 to 20 are arranged on the same substrate.   A camera module in which the lens according to any one of claims 9 to 20 is incorporated.   An electronic device in which the lens according to any one of claims 9 to 20 or the camera module according to claim 22 is incorporated.

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