CN102621771A - Shading film and camera module using the same - Google Patents

Abstract

The invention relates to a shading film which comprises a first surface and a second surface which are located on two opposite sides of the shading film and in parallel with each other. The shading film further comprises a through hole provided at the center of the first surface and penetrating through the second surface, and at least one frustum-shaped inner surface arranged in the through hole and tilted relative to the first surface or the second surface. The shading film has a thickness of 0.030mm to 0.054mm. In addition, the invention further relates to a camera module using the shading film.

Description

Light-shielding sheet and camera module using the light-shielding sheet

technical field

The invention relates to the field of lens processing, in particular to a light-shielding sheet and a camera module using the light-shielding sheet.

Background technique

With the development of multimedia technology, electronic products such as digital cameras, video cameras and mobile phones with camera functions are more and more popular among consumers. The requirement for the above-mentioned electronic products with shooting functions is that their shooting quality is better, that is image is clear. In the prior art, the imaging quality of an object largely depends on the structural design of each optical component in the camera module.

Existing camera modules usually include a lens barrel, a plurality of lenses held in the lens barrel, an infrared cut filter, a shading sheet and other optical components. A general shading sheet 11 is shown in FIG. 1 , and the shading sheet 11 It is usually in the shape of a hollow ring, and a through hole 15A is opened in the center. In use, the shading sheet 11 is arranged between the lenses 15 to space two adjacent lenses 15, the light used for imaging passes through the through hole 15A and is imaged on the image sensor, and the rest of the light is absorbed by the shading sheet 10 Therefore, the surface of the shading sheet 10 usually does not reflect light when the lens 15 is spaced, so it can prevent the reflected light from the surface from being reflected or refracted and imaged on the image sensor to cause glare, thereby ensuring imaging. Quality, to prevent distortion and deformation of the shooting picture. However, it is still difficult for ordinary light-shielding sheets to achieve a better light-shielding effect in a strong external environment. Smooth cylindrical curved surface, when strong light shines on it, it is difficult for the side wall 150 to completely absorb the light and reflect part of the light, and the reflected light is incident on the image sensor after further reflection or refraction to form Glare, resulting in blurred imaging, such as ghosting and other defects.

Contents of the invention

In view of this, it is necessary to provide a light-shielding sheet that can prevent glare.

A light-shielding sheet, the light-shielding sheet includes a first surface and a second surface parallel to each other on opposite sides thereof, a through hole opened in the center of the first surface and penetrating through the second surface, at least one A truncated cone-shaped inner surface in the through hole and inclined relative to the first surface or the second surface.

A camera module. The camera module includes a lens barrel, at least two lenses accommodated in the cavity, at least one light-shielding sheet, and an image sensor. The lens barrel includes a front cover, a first through hole opened in the center of the front cover, and a cylinder extending from one side of the front cover, the front cover and the cylinder Combined to form a containment chamber. Each lens has an optical part and a support part surrounding the optical part, and at least two optical parts of the at least two lenses are coaxial. The at least one shading sheet is arranged between the at least two lenses to space the at least two lenses, and the at least one shading sheet includes a first surface and a second surface parallel to each other on opposite sides thereof, a A second through hole opened in the center of the first surface and penetrating through the second surface, at least one frustum-shaped inner surface located in the second through hole and inclined relative to the first surface or the second surface, and the light-shielding The thickness of the sheet 10 is 0.030mm˜0.054mm, and the at least one second through hole is coaxial with the first through hole. The image sensor is arranged on a side of the at least two lenses away from the front cover, and the image sensor is used for sensing the light passing through the first through hole and at least one second through hole in sequence.

Compared with the prior art, the shading sheet provided by the present invention is provided with an inclined frustum-shaped inner surface, which can prevent light from shining on it, or reflect along the side away from the image sensor The light incident on it, so as to prevent the reflected light from entering the image sensor to form glare, and ensure that the camera module forms a clear image.

Description of drawings

FIG. 1 is a schematic cross-sectional view of two lenses separated by an existing light-shielding sheet.

FIG. 2 is a schematic cross-sectional view of the light-shielding sheet provided by the first embodiment of the present invention.

FIG. 3 is a schematic cross-sectional view of a light-shielding sheet provided by a second embodiment of the present invention.

FIG. 4 is a schematic cross-sectional view of a light-shielding sheet provided by a third embodiment of the present invention.

FIG. 5 is a schematic cross-sectional view of a camera module using the light-shielding sheet shown in FIG. 2 and FIG. 3 .

FIG. 6 is a schematic cross-sectional view of a camera module using the light-shielding sheet shown in FIG. 3 and FIG. 4 .

Description of main component symbols

Shading film 10, 11, 20, 30

First Surface 10A, 20A, 30A

Second Surface 10B, 20B, 30B

Through Hole 10C, 30C, 20C, 15A

Frustum-shaped inner surface 101, 201

First frustum-shaped inner surface 301

Second frustum-shaped inner surface 302

Ring-shaped cone 303

Camera module 100, 200

side wall 150

Lens 15

Front cover 31

The first through hole 310

Third Surface 311

Fourth Surface 312

Cylindrical body 32

Lens barrel 33

First lens 40

First Optical Department 41

The first support part 42

Groove 45

Bottom 45A

Second lens 50

Second optical department 51

The second support part 52

Boss 55

Third lens 60

Third Optical Department 61

The third support part 62

Filter 70

Surface 70A

Mirror mount 80

Top plate 80A

Foot 80B

Joint 80C

The third through hole 85

Containment Room 87

Image sensor 90

Circuit board 95

Detailed ways

The present invention will be further described in detail below in conjunction with specific embodiments.

Please refer to FIG. 2 , the first embodiment of the present invention provides a light-shielding sheet 10 made of SOMA light-shielding material, the light-shielding sheet 10 is in the shape of a circular plate, and the light-shielding sheet 10 includes a A first surface 10A, a second surface 10B, and a through hole 10C opened in the center of the first surface 10A. The first surface 10A and the second surface 10B are parallel to each other. The through hole 10C runs through the second surface 10B of the light shielding sheet 10 . In addition, the shading sheet 10 has a truncated cone-shaped inner surface 101 located in the through hole 10C, the truncated cone-shaped inner surface 101 is in contact with the first surface 10A and the second surface 10B respectively, and the truncated cone-shaped inner surface 101 It is inclined relative to the first surface 10A or the second surface 10B. In this embodiment, the diameter of the frustum-shaped inner surface 101 gradually decreases along the direction away from the first surface 10A. It can be understood that the light-shielding sheet 10 can also be in the shape of a square plate, and is not limited to the specific embodiment.

In addition, the light-shielding sheet 10 can be made thinner, for example, the thickness of the light-shielding sheet 10 can be approximately 0.030-0.054 mm. In this embodiment, the thickness of the shading sheet 10 may be approximately 0.033 mm.

Please refer to FIG. 3 , the second embodiment of the present invention provides a light-shielding sheet 20, which is basically similar to the light-shielding sheet 10 provided in the first embodiment, including a first surface 20A and a second surface 20B. The reason is that the diameter of the frustum-shaped inner surface 201 located in the through hole 20C becomes gradually larger along the direction away from the first surface 20A. In addition, the radius of the outer contour of the light-shielding sheet 20 is greater than the radius of the outer contour of the light-shielding sheet 10 , and the thickness of the light-shielding sheet 20 is greater than that of the light-shielding sheet 10 .

Referring to Fig. 4, the third embodiment of the present invention provides a light shielding sheet 30, which is basically similar to the light shielding sheet 10 provided in the first embodiment, except that the light shielding sheet 30 has a A first truncated cone-shaped inner surface 301 in the hole 30C, and a second truncated cone-shaped inner surface 302 located in the through hole 30C, wherein the first truncated cone-shaped inner surface 301 is respectively connected to the first surface 30A and the second truncated cone The frustum-shaped inner surface 302 is in contact with each other, and the second truncated-cone-shaped inner surface 302 is respectively in contact with the first truncated-cone-shaped inner surface 301 and the second surface 30B.

In this embodiment, the first truncated cone-shaped inner surface 301 and the second truncated cone-shaped inner surface 302 are inclined relative to the first surface 30A or the second surface 30B respectively, wherein the first truncated cone-shaped inner surface 301 of the through hole 30C The diameter of the through-hole 30C gradually becomes larger along the direction away from the first surface 30A, and the diameter of the second frustum-shaped inner surface 302 of the through hole 30C gradually decreases along the direction away from the first surface 30A, which makes the first frustum-shaped The inner surface 301 and the second truncated cone-shaped inner surface 302 are combined to form an annular pointed cone 303, and the first truncated cone-shaped inner surface 301 and the second truncated cone-shaped inner surface 302 are the ring-shaped pointed cone 303 respectively. sides. In this embodiment, the shading sheet 30 has a symmetry axis N parallel to the first surface 30A or the second surface 30B and passing through the top of the annular tapered portion 303 , the first frustum-shaped inner surface 301 and the The second frustum-shaped inner surface 302 is axisymmetric with respect to the symmetry axis N.

As shown in Figure 5, the fourth embodiment of the present invention provides a camera module 100, which uses the light shielding sheet 10 described in the first embodiment and the light shielding sheet 20 described in the second embodiment, the camera module 100 Including the shading sheet 10, the shading sheet 20, a lens barrel 33, a first lens 40, a second lens 50, a third lens 60, a filter 70, a mirror holder 80, and an image sensor 90.

The lens barrel 33 has a front cover 31 and a cylindrical body 32 extending from the front cover 31 . In this embodiment, the front cover 31 is in the shape of a circular plate, and the front cover 31 includes a third surface 311 and a fourth surface 312 opposite to each other. The outer edge of the fourth surface 312 extends out. The central portion of the third surface 311 of the front cover 31 defines a first through hole 310, the first through hole 310 is approximately truncated conical, and the first through hole 310 is along the direction away from the third surface 311 gradually narrows. In addition, the first through hole 310 defines an optical axis M, and the cylindrical body 32 surrounds the optical axis M to form a cylindrical accommodation cavity 320, the accommodation cavity 320 communicates with the first through hole 310, and the cylinder The central axis of the body 32 coincides with the optical axis M. In use, the first through hole 310 allows external light to enter the receiving cavity 320 .

The first, second, and third lenses 40, 50, 60 are respectively a plastic lens, wherein the first lens 40 is disposed adjacent to the front cover 31, and the third lens 60 is located away from the first lens 40. On one side of the front cover 31 , the second lens 50 is located between the first lens 40 and the third lens 60 .

The first lens 40 has a first optical portion 41 and a first supporting portion 42 surrounding the first optical portion 41 , wherein the first supporting portion 42 abuts against the fourth surface 312 of the front cover 31 , the opposite sides of the first optical part 41 respectively have a first optical curved surface 411 and a second optical curved surface 412, wherein the first optical curved surface 411 is adjacent to the third surface 311 and exposed to the first through hole 310 middle.

A groove 45 is defined on a side of the first lens 40 away from the front cover 31 , and the first lens 40 has a bottom surface 45A corresponding to the groove 45 . In this embodiment, the light shielding sheet 30 is disposed on the bottom surface 45A of the groove 45 .

The second lens 50 includes a second optical portion 51 and a second supporting portion 52 surrounding the second optical portion 51 . The side of the second supporting portion 52 adjacent to the first lens 40 has a protrusion 55 , and the second lens 50 is clamped on the first lens 40 through the cooperation of the protrusion 55 and the groove 45 . In this embodiment, the shading sheet 10 is disposed between the bottom surface 45A of the groove 45 and the boss 55, specifically, the first surface 10A of the shading sheet 10 is adhered to the bottom surface 45A of the groove 45 by glue. Next, the second surface 10B of the light-shielding sheet 10 is bonded to the surface of the boss 55 by glue. In this embodiment, the shading sheet 10 can be used to separate the first lens 40 and the second lens 50 . In addition, the axis of the through hole 10C of the light shielding sheet 10 coincides with the optical axis M of the first through hole 310 of the lens barrel 33 .

The third lens 60 is disposed on the other side of the second lens 50 away from the first lens 40 . The third lens 60 includes a third optical portion 61 and a third supporting portion 62 surrounding the second optical portion 51 .

The light-shielding sheet 20 can be arranged between the second lens 50 and the third lens 60 to separate the second lens 50 and the third lens 60, specifically, the first surface 10A of the light-shielding sheet 20 is glued to the third lens 60 by glue. Surfaces of the second supporting portion 52 are bonded, and the second surface 20B of the light-shielding sheet 20 is bonded to the surface of the third supporting portion 62 by glue.

The filter 70 is disposed on a side of the third lens 60 away from the second lens 50 . In this embodiment, the surface 70A of the filter 70 is bonded to the surface of the third supporting portion 62 by glue. The filter 70 can be specifically an infrared cut filter (infrared cut filter), which is used to filter out infrared light that cannot be recognized by human eyes.

The mirror base 80 includes a top plate 80A, a third through hole 85 disposed at the center of the top plate 80A, and a foot 80B extending along the top plate 80A to a side away from the lens barrel 33 . The inner wall of the base 80B defines a chamber 87 . In addition, the mirror base 80 further includes a joint portion 80C extending from the top plate 80A to a side away from the foot base 80B. The inner diameter of the joint portion 80C is equal to the inner diameter of the third through hole 85 .

The lens barrel 33 is partially disposed in the third through hole 85 of the lens base 80 . Specifically, the outer wall of the cylindrical body 32 is provided with an external thread, the inner wall of the joint portion 80C is provided with an internal thread matching the external thread, and the lens barrel 33 is arranged on the mirror through the engagement of the external thread and the internal thread. Seat 80.

The image sensor 90 is disposed in the chamber 87 . Specifically, the image sensor 90 is arranged opposite to the filter 70, which can be a Charge-coupled Device (CCD) or a Complementary Metal-Oxide-Semiconductor (CMOS) . In addition, a circuit board 95 can be provided and the image sensor 90 can be disposed thereon, so that the image sensor 90 can be powered by the circuit board 95 . In this embodiment, the base 80B of the mirror base 80 is disposed on the circuit board 95 .

Since the camera module 100 is provided with shading sheets 10, 20, the shading sheet 10 has a truncated cone-shaped inner surface 101 inclined relative to the first surface 10A, and the shading sheet 20 has a truncated cone-shaped inner surface 201 inclined relative to the first surface 20A, and The frustum-shaped inner surface 101 is generally facing the first through hole 310, so it can reflect incident light on the side away from the image sensor 90, and the frustum-shaped inner surface 201 is generally away from the first through hole. 310 , therefore, the frustum-shaped inner surface 201 can prevent the light entering the receiving cavity 320 from the first through hole 310 from being incident on it. Therefore, the shading sheet 10, 20 can prevent the light reflected by its surface from entering directly or after further reflection or refraction while separating the first and second mirrors 40 and 50, and the second and third mirrors 50 and 60. The glare is formed on the image sensor 90 to ensure that the camera module 100 forms a clear image.

In other modified embodiments, the size of the light-shielding sheet 10, 20 can also be adjusted, such as the outer diameter, thickness, etc., and the light-shielding sheet 20 is arranged between the first and second lenses 40, 50 to space the first and second lenses 40, 50. The second lens 40, 50, and the light-shielding sheet 10 is arranged between the second and third lenses 50, 60 to separate the second and third lenses 50, 60, so as to achieve the effect of anti-glare. In addition, the number of lenses and light-shielding sheets included in the camera module 100 can be adjusted accordingly according to actual needs, as long as it can prevent glare in the camera module 100 while separating multiple lenses, it is not limited to specific Example.

As shown in FIG. 6 , a camera module 200 provided in the fifth embodiment of the present invention is similar to the camera module 100 provided in the fourth embodiment, the difference is that the shading sheet included in the camera module 100 is 10 is replaced by the shading sheet 30 provided in the third embodiment. Since the shading sheet 30 has an axially symmetrical first truncated cone-shaped inner surface 301 and a second truncated truncated cone-shaped inner surface 302, it is not necessary to consider the assembly direction of the shading sheet 30 when assembling the shading sheet 30, specifically, whether it is the shading sheet 30 The first surface 30A is bonded with the bottom surface 245A of the groove 245 by glue (as shown in FIG. 6 ), or the second surface 30B of the light-shielding sheet 30 is bonded with the bottom surface 245A of the groove 245 by glue, and the light-shielding sheet 30 Both have the effect of preventing glare from being formed in the camera module 200, and the effect of anti-glare is the same.

It should be pointed out that the above-mentioned embodiments are only preferred embodiments of the present invention, and those skilled in the art can also make other changes within the spirit of the present invention, which should be included within the scope of the present invention.

Claims (10)

1. anti-dazzling screen; Comprise being positioned at its relative both sides and the first surface that is parallel to each other and second surface, through hole that is opened in this first surface center and runs through this second surface, at least onely being positioned at this through hole and the frustum inside surface that tilts of this first surface or this second surface relatively, and the thickness of this anti-dazzling screen is 0.030mm～0.054mm.

2. anti-dazzling screen as claimed in claim 1 is characterized in that, this at least one anti-dazzling screen adopts the SOMA light screening material to process.

3. anti-dazzling screen as claimed in claim 1 is characterized in that, the internal diameter of this at least one through hole diminishes along the direction away from this first surface gradually.

4. anti-dazzling screen as claimed in claim 1; It is characterized in that; This at least one anti-dazzling screen comprises one first frustum inside surface and one second frustum inside surface; This first frustum inside surface joins with first surface and this second frustum inside surface respectively; And the diameter of the first frustum inside surface of at least one through hole becomes greatly along the direction away from this first surface gradually, and this second frustum inside surface joins with the first frustum inside surface and second surface respectively, and the diameter of the second frustum inside surface of this at least one through hole diminishes along the direction away from this first surface gradually.

5. anti-dazzling screen as claimed in claim 1 is characterized in that, the thickness of this at least one anti-dazzling screen is 0.033mm.

6. camera module, this camera module comprises:

A lens barrel, this lens barrel comprise a front cover body, first through hole and the extended cylinder of a wherein side by this front cover body that is opened in this front cover body center, and this front cover body combines with this cylinder and forms a host cavity;

At least two eyeglasses that are housed in this host cavity, each eyeglass has an optic and the support portion around this optic, and at least two optic of these at least two eyeglasses are coaxial;

At least one anti-dazzling screen; This at least one anti-dazzling screen is arranged between these two eyeglasses with these two eyeglasses of interval at least at least; And this at least one anti-dazzling screen comprise be positioned at its relative both sides and be parallel to each other first surface and second surface, second through hole that is opened in this first surface center and runs through this second surface, at least one this second through hole and frustum inside surface of tilting of this first surface or this second surface relatively of being positioned at; And the thickness of this anti-dazzling screen is 0.030mm～0.054mm, and this at least one second through hole is coaxial with this first through hole; And

A CIS, this CIS are arranged on the side of these at least two eyeglasses away from this front cover body, and this CIS is used for the light after sensing passes this first through hole and this at least one second through hole successively.

7. camera module as claimed in claim 6 is characterized in that, the thickness of this at least one anti-dazzling screen is 0.033mm.

8. camera module as claimed in claim 6 is characterized in that, this at least one anti-dazzling screen is mutually bonding through at least two eyeglasses of glue and this.

9. camera module as claimed in claim 6 is characterized in that, this at least one anti-dazzling screen adopts the SOMA light screening material to process.

10. camera module as claimed in claim 6; It is characterized in that; This camera module comprises one first eyeglass and one second eyeglass; This first eyeglass offer a groove, this second eyeglass have one with the suitable boss of this groove, at least one anti-dazzling screen is between the bottom surface and this boss of this groove.

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