KR100603255B1 - Optical pickup and manufacturing method - Google Patents

Abstract

An optical pickup according to the present invention, comprising: an objective lens for focusing incident light on a recording surface of a recording medium; A substrate on which an objective lens is mounted; A light source for emitting light of a predetermined wavelength; A light receiving unit installed on a substrate to receive light reflected from the recording surface; An optical path guide member installed on the other surface of the substrate and guiding the light emitted from the light source to the objective lens and guiding the light reflected from the recording medium to the light receiving unit; And a support unit coupled to the substrate and supporting the light source in a posture capable of emitting light directly from the light source to the light path guide member. As a result, the light emitted from the light source can be directly guided to the light path guide member, thereby making it easy to manufacture and providing an optical pickup with improved light efficiency.

Substrate, light source, laser diode, LD, vertical, rotation.

Description

Optical pickup and its manufacturing method {A optical pick-up and a method of making for the same}

1 is a cross-sectional view schematically showing a general optical pickup,

2 is a cross-sectional view schematically showing an optical pickup according to an embodiment of the present invention;

3 is a plan view schematically showing the initial arrangement of the laser diode according to FIG.

4A and 4B are partial cross-sectional views illustrating a method of manufacturing the optical pickup according to FIG. 3;

5 is a plan view schematically showing an optical pickup according to another embodiment of the present invention;

6A and 6B are partial cross-sectional views illustrating a method of manufacturing the optical pickup shown in FIG. 5;

7 is a flow chart for explaining the optical pickup manufacturing method according to the present invention.

<Explanation of symbols for the main parts of the drawings>

110: objective lens 120: substrate

121: accommodating part 130: light source

140: accommodating part 150: light path guide member

160: support unit 161, 161 ': rotating member

161a, 161a ': swivel plate 161b 161b': torsion spring

162: support plate 162a, 162a ': leaf spring portion

162b, 162b ': interference protrusion

The present invention relates to an optical pickup and a method of manufacturing the same.

BACKGROUND ART Optical pickup is a device for recording / reproducing information on a recording medium used in portable information devices such as PDAs, mobile phones, digital cameras, notebook computers, and camcorders. This optical pickup is a laser diode is generally used as a light source for generating and irradiating light of a predetermined wavelength, an example of such a general optical pickup is shown in Figure 1, briefly described as follows.

As shown, the optical pickup includes an optical path guide unit 50 having an objective lens 10, a substrate 20, a laser diode 30, a light receiving unit 40, and reflecting surfaces 51, 52, and 53. Equipped.

The laser diode 30 is installed in the receiving groove 21 of the substrate 20 to emit light of a predetermined wavelength. The emitted light is reflected by the optical path guide member 50 and proceeds to the objective lens 10. Here, the light focused on the objective lens 10 is reflected from the recording surface of the recording medium (D), the light receiving unit 40 for detecting the information signal and the error signal of the recording medium (D) by the optical path guide member 50 again. Is received.

On the other hand, in the general optical pickup having the configuration described above, the light emitted from the laser diode 30 installed in the receiving groove 21 of the substrate 20 proceeds vertically with respect to the substrate 20. Should be. To this end, the receiving groove 21 is provided with a light reflecting surface 22 having a 45 degree inclination so as to guide the traveling direction of the light emitted from the light source 30.

However, since the light reflecting surface 22 is formed when the receiving groove 21 is formed by etching the substrate 20, it is difficult to form 45 degrees using a general etching method. To this end, a method of forming the light reflecting surface 22 of 45 degrees through a separate additional process using a wafer is used, but also, it is difficult to accurately match the crystal direction of the wafer, which makes the manufacturing process difficult. There is a problem.

In addition, when the light reflecting surface 22 is formed by etching the substrate 20, since the laser diode 10 is disposed at a predetermined depth from the surface of the substrate 20, the laser may be disposed due to a deep step. There is also a problem that the wiring work to the diode 30 is difficult. In addition, since the substrate 20 has a predetermined thickness or more to be etched, a thick optical pickup that is not suitable for an increasingly miniaturized portable information device is provided.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object thereof is to provide an improved optical pickup and a method of manufacturing the same so that the production is simple and the light efficiency can be improved.

An optical pickup according to the present invention for achieving the above object comprises an objective lens for concentrating incident light on a recording surface of a recording medium; A substrate on which the objective lens is mounted; A light source for emitting light of a predetermined wavelength; A light receiving unit installed on the substrate to receive light reflected from the recording surface; An optical path guide member installed on the other surface of the substrate and configured to guide light emitted from the light source to the objective lens and guide light reflected from the recording medium to the light receiving unit; And a support unit coupled to the substrate and supporting the light source in a posture capable of directly emitting light from the light source to the light path guide member.

According to a preferred embodiment of the present invention, the support unit, rotatably installed around the receiving portion formed through the substrate, the rotating member for supporting the light source; Is coupled to one surface of the substrate, when coupled to the support plate for interfering with the rotating member through the receiving portion to fix the rotating member in a pivoted position; preferably includes.

Here, the support plate, the plate spring portion in close contact with the one surface of the substrate; Protruding from the plate spring vertically, the interference projection passing through the receiving portion for supporting the pivot member perpendicular to the substrate; preferably includes.

In addition, the rotating member, the rotating plate is accommodated in the receiving portion when rotated by the interference projection, the rotating plate on which the light source is supported; And a pair of torsion springs that rotatably connect both ends of the pivoting plate to each other with respect to the substrate.

Here, the rotating plate and the torsion springs are integrally formed, and the light source is electrically connected to the substrate through the torsion springs.

In addition, when the pivoting plate interferes with the interference member, the pivoting center of the pivoting plate may be provided to face the receiving part so that a part of the pivoting plate is inserted into the receiving part.

The rotating member may include a rotating plate installed on the other surface of the substrate and supporting the light source; And a torsion spring rotatably connecting one end of the rotatable plate to the other surface of the substrate, wherein the rotatable plate is rotated about the torsion spring by an interference protrusion passing through the receiving portion.

In addition, the support unit may support the light source to emit light perpendicular to the other surface of the substrate.

Another object of the present invention includes the steps of movably disposing a light source on the other surface of the substrate on which the objective lens is to be mounted; And moving the disposed light sources in a vertical direction with respect to the substrate to fix them.

Here, the disposing step includes the step of rotatably connecting the rotating member to the substrate; And mounting the light source on the pivot member.

The connecting step may include providing a rotating member having a rotating plate on which the light source is mounted, and a rotating member having a pair of torsion springs extending from both ends of the rotating plate; And coupling each of the pair of torsion springs to the substrate.

Here, the coupling of the torsion spring may include the step of electrically connecting the torsion spring and the substrate.

The connecting may include: providing a rotating member having a rotating plate on which the light source is mounted and a torsion spring provided at one end of the rotating plate; Coupling the torsion spring to the substrate.

In addition, the fixing may include forming a receiving portion through the substrate; Passing a portion of the support plate from one surface of the substrate to the receiving portion to rotate by interfering with the rotating member; And fixing the support plate to one surface of the substrate while interfering with the pivot member.

Here, the support plate, plate spring portion which is in close contact with the one surface of the substrate; And an interference protrusion protruding vertically from the leaf spring and interfering with the pivot member.

In the rotating step, the rotating member may be rotated to be perpendicular to the substrate.

And mounting an objective lens on one surface of the substrate to concentrate light onto the recording surface of the recording medium; Providing a light receiving unit on the substrate; And coupling a light path guide member for guiding the light emitted from the light source to the objective lens on the other side of the substrate and guiding the light reflected from the recording surface to the light receiving unit.

Best Mode for Carrying Out the Invention Preferred embodiments of the present invention will now be described based on the accompanying drawings.

2 is a cross-sectional view schematically showing an optical pickup according to an embodiment of the present invention. As shown in FIG. 2, an optical pickup according to an exemplary embodiment of the present invention includes an objective lens 110 and a substrate 120. , A light source 130, a light receiving unit 140, a light path guide member 150, and a support unit 160. Meanwhile, reference numeral 170 is a spacer provided between the substrate 120 and the optical path guide member 150.

The objective lens 110 concentrates incident light emitted from the light source 130 on the recording surface of the recording medium D. The objective lens 110 is mounted on one surface 123 of the substrate 120, that is, the surface facing the recording medium D. Here, the substrate 120 may be formed of a silicon material and has a receiving portion 121 formed therethrough. In addition, the light path guide member 150 and the light receiving unit 140 are installed on the other surface 125 of the substrate 120.

The light source 130 emits light having a predetermined wavelength and is disposed perpendicular to the substrate 120 by the support unit 160 to be described later. Therefore, the light generated by the light source 130 is emitted directly to the light path guide member 150 may shorten the light path. Here, the light source 130 may be a laser diode that emits a laser beam.

The light receiving unit 140 is installed on the substrate 120 to receive light reflected from the recording surface of the recording medium D. The light receiving unit 140 detects an information signal and an error signal of the recording medium D from the received light. Here, the light receiving unit 140 is disposed on the other surface 125 of the substrate 120, that is, the same surface of the substrate 120 on which the light source 130 is disposed.

The optical path guide member 150 includes a prism portion 150a having reflective surfaces 152 and 153 facing each other, and a polarization beam splitter (PBS) installed to share the prism portion 150a and the reflective surface 152 ( 150b). The optical path guide member 150 is installed on the other surface 125 of the substrate 120, guides the light emitted from the light source 130 to the objective lens 110, and is reflected from the recording medium D. Guided light to the light receiving unit 140. Here, the reflective surfaces 151, 152, and 153 are formed to be inclined at 45 degrees to vertically guide the light emitted from the light source 130. In particular, the reflective surface 152 is disposed to face the light source 130.

The support unit 160 is coupled to one surface 123 of the substrate 120, and moves the light source 130 in a posture capable of directly emitting light from the light source 130 to the light path guide member 150. I support it. That is, the support unit 160 supports the light source 130 to emit light perpendicular to the other surface 125 of the substrate 120. To this end, as shown in Figures 3 to 4b, the support unit 160 includes a rotation member 161 and the support plate 162.

The rotating member 161 is rotatably installed around the receiving portion 121 formed on the substrate 120 and supports the light source 130. Here, the rotating member 161 is a pair of torsional rotatably connecting the rotating plate 161a for supporting the light source 130 and both ends of the rotating plate 161a spaced from each other with respect to the substrate 120. Spring 161b. The rotating plate 161a and the torsion spring 161b are integrally formed of a metal material. Therefore, the light source 130 may be electrically connected to the substrate 120 through the torsion spring 161b. On the other hand, the center of rotation of the rotating plate 161a is provided to face the receiving portion 121. Therefore, as shown in FIG. 4B, when the pivoting plate 161a interferes with the interference protrusion 162b, a part of the pivoting plate 161a may be inserted into the receiving part 121. By allowing a part of the pivoting plate 161a to be inserted into the accommodation part 121, it is possible to minimize the increase in the thickness of the optical pickup.

The support plate 162 is coupled to one surface 123 of the substrate 120, and as shown in FIG. 4B, when the coupling plate 162 interferes with the rotation member 161 through the receiving portion 121, the rotation member ( 161 is fixed in the pivoted position. To this end, the support plate 162 is formed to protrude vertically from the leaf spring portion 162a and the leaf spring portion 162a in close contact with the one surface 123 of the substrate 120, the receiving portion 121 It includes an interference protrusion 162b passing through to support the rotating member 161 perpendicular to the substrate 120. Here, the interference protrusion 162b rotates the rotating plate 161a while passing through the receiving portion 121, and fixes the rotating plate 161a in the rotated state. Meanwhile, the leaf spring unit 162a may have a signal transmission between the optical pickup and a main controller not shown, and a heat radiating function between the optical pickup and the recording medium.

According to this configuration, a part of the light source 130 is inserted into the receiving portion 121 of the substrate 120 to emit light perpendicular to the other surface 125 of the substrate 120, so that the substrate 120 The thickness can be reduced. That is, it is not necessary to make the light reflecting surface and the receiving groove separately on the substrate 120 as in the prior art, the light path is shortened, the reflection loss is reduced, the light efficiency can be increased, and the thickness of the substrate can be reduced, thereby simplifying the structure. .

5 to 6B, the optical pickup according to another embodiment of the present invention may include an objective lens 110, a substrate 120, a light source 130, a light receiving unit 140, a light path guide member 150, and And a support unit 160 '. Here, the technical configuration of the objective lens 110, the substrate 120, the light source 130, the light receiving unit 140 and the light path guide member 150 is similar to the technical configuration described with reference to FIGS. Thus, the same technical configuration as the above-described embodiment is given the same reference numerals and detailed description thereof will be omitted.

According to a characteristic technical configuration of the present embodiment, as shown in FIG. 6A, the rotation member 161 ′ of the support unit 160 is installed on the other surface 125 of the substrate 120 to support the light source 130. And a torsion spring 161b 'for rotatably connecting one end of the pivoting plate 161a' to the other surface 125 of the substrate 120. According to this configuration, as shown in FIG. 6B, the rotating member 161a 'is connected to the torsion spring 161b' by the interference protrusion 162b 'that has passed through the receiving portion 121. Will rotate around.

As a result, the light source 130 rotates the torsion spring 161b 'provided on the other surface 125 of the substrate 120 at the rotational center, and rotates perpendicularly to the surface of the substrate 120 to emit light. You can do it.

A method of manufacturing the optical pickup having the above configuration will be described with reference to FIGS. 2 to 7.

First, the rotating members 161 and 161 'are connected to the substrate 120 (S10). That is, as an example, as shown in FIG. 3, the rotating plate 161a on which the light source 130 is mounted and a pair of torsion springs 161b extending from both ends of the rotating plate 161a are provided. The rotating member 161 is provided to fix each of the torsion springs 161b to one surface 123 of the substrate 120. Specifically, each of the pair of torsion springs 161b may be coupled to one surface 123 of the substrate 120 by a so-called anchoring method. The torsion spring 161b may be electrically connected to the substrate 120 at the time of coupling. Thereafter, as shown in FIG. 3, the receiving part 121 is formed through the substrate 120 to a predetermined size (S11).

In addition, according to another embodiment of the present invention, as shown in FIG. 5, the rotating member 161 ′ includes a rotating plate 161 a ′ on which the light source 130 is mounted, and the rotating plate 161 a ′. A rotating member 161 ′ having a torsion spring 161 b ′ provided at one end 123 and coupled to the substrate 120 is provided. The torsion spring 161b 'may also be coupled to the substrate 120 by a fastening method such as an anchor, and electrically connected to the substrate 120.

When the rotating members 161 and 161 'are connected to the substrate 120, the light source 130 is mounted on the rotating members 161 and 161' (S12). Next, the pivoting members 161 and 161 'are rotated while the support plates 162 and 162' are coupled to the substrate 120 (S13). That is, when the plate springs 162a and 162a 'are tightly coupled to the one surface 123 of the substrate 120 to the support plates 162 and 162', the interference protrusions 162b and 162b 'are accommodated. Interfering with the rotating members (161, 161 ') while passing through the portion (12). Then, the rotating members 161 and 161 'are rotated to be orthogonal to the substrate 120 with the torsion springs 161b and 161b' as the center of rotation. As a result, the light source 130 emits perpendicularly to the other surface 125 of the substrate 120. As described above, the rotation members 161 and 161 'and the light source 130 which are vertically transformed with respect to the substrate 120 have a posture perpendicular to the restoring force of the torsion springs 161b and 161b' in the direction of the arrow. It can be maintained.

Finally, the objective lens 110, the light receiving portion 140 and the optical path guide member 150 is installed on the substrate 120 (S14). Herein, the objective lens 110 is mounted on one surface 123 of the substrate 120, and the light receiving unit 140 is provided on the other surface 125 of the substrate 120. In addition, the optical path guide member 150 is coupled to the other surface 125 of the substrate 120. In this way, manufacture of the optical pickup as shown in FIG. 2 is completed.

As described above, according to the optical pickup of the present invention and a method of manufacturing the same, by combining the support unit and the substrate, the light source can be installed to emit light perpendicular to the other surface of the substrate to which the optical path guide member is coupled. . Therefore, the light emitted can be directly guided to the optical path guide member without providing a 45 degree light reflection surface on the substrate. Therefore, it is possible to provide an optical pickup with a simple manufacturing method and improved light efficiency.

In addition, the portion of the light source is rotated and inserted into the receiving portion of the substrate, it is possible to reduce the thickness of the substrate, it is possible to provide a small optical pickup.

While the invention has been shown and described in connection with the preferred embodiments for illustrating the principles of the invention, the invention is not limited to the construction and operation as shown and described. Rather, those skilled in the art will appreciate that many modifications and variations of the present invention are possible without departing from the spirit and scope of the appended claims. Accordingly, all such suitable changes and modifications and equivalents should be considered to be within the scope of the present invention.

Claims (18)

An objective lens for focusing incident light on the recording surface of the recording medium; A substrate on which the objective lens is mounted; A light source for emitting light of a predetermined wavelength; A light receiving unit installed on the substrate to receive light reflected from the recording surface; An optical path guide member installed on the other surface of the substrate and configured to guide light emitted from the light source to the objective lens and guide light reflected from the recording medium to the light receiving unit; And a support unit installed on the substrate, the support unit rotatably supporting the light source to emit light directly from the light source to the optical path guide member. The method of claim 1, wherein the support unit, A rotating member rotatably installed around the receiving portion formed through the substrate and supporting the light source; And a support plate coupled to one surface of the substrate and configured to interfere with the pivot member through the receiving portion and to fix the pivot member in a pivoted position. The method of claim 2, wherein the support plate, A leaf spring part in close contact with one surface of the substrate; And an interference protrusion protruding vertically from the leaf spring portion and passing through the receiving portion to support the pivot member vertically with respect to the substrate. The method of claim 3, wherein the rotating member, A pivoting plate which is partially accommodated in the accommodation portion by the interference protrusion and the light source is supported on one surface thereof; And a pair of torsion springs that rotatably connect the opposite ends of the rotating plate with respect to the substrate. The optical pickup of claim 4, wherein the rotating plate and the torsion springs are integrally formed. The optical pickup of claim 4, wherein the light source is electrically connected to the substrate through the torsion springs. The method of claim 4, wherein And the pivoting center of the pivoting plate faces the accommodating portion such that a part of the pivoting plate is inserted into the accommodating portion when the pivoting plate interferes with the interference member. The method of claim 3, wherein the rotating member,  A rotating plate installed on the other surface of the substrate and supporting the light source; And a torsion spring that rotatably connects one end of the pivot plate to the other surface of the substrate. The pickup plate is rotated about the torsion spring by the interference projection passing through the receiving portion. The optical pickup of claim 1, wherein the support unit supports the light source to emit light perpendicular to the other surface of the substrate. Arranging the light source on the other surface of the substrate on which the objective lens is to be mounted to be rotatable; And moving the arranged light source in a vertical direction with respect to the substrate to fix the arranged light source. The method of claim 10, wherein the disposing step, Rotatably connecting a rotation member to the substrate; And mounting the light source to the pivot member. The method of claim 11, wherein the connecting step Providing a rotating member having a rotating plate on which the light source is mounted and a pair of torsion springs extending from both ends of the rotating plate; And coupling each of the pair of torsion springs to the substrate. The method of claim 12, wherein the combining of the torsion springs, And electrically connecting the torsion spring and the substrate. The method of claim 11, wherein the connecting step, Providing a rotating member having a rotating plate on which the light source is mounted and a torsion spring provided at one end of the rotating plate; And coupling the torsion springs to the substrate. The method of claim 10, wherein the fixing step comprises: Penetrating a receiving portion through the substrate; Passing a portion of the support plate from one surface of the substrate to the receiving portion to rotate by interfering with the rotating member; And fixing the support plate to one surface of the substrate in a state of interfering with the rotation member. The method of claim 15, wherein the support plate, A leaf spring part tightly coupled to one surface of the substrate; And an interference protrusion protruding vertically from the leaf spring and interfering with the pivot member. The method of claim 15, wherein in the rotating step, And rotating the pivot member to be orthogonal to the substrate. The method of claim 10, Mounting an objective lens for concentrating light onto a recording surface of a recording medium on one surface of the substrate; Providing a light receiving unit on the substrate; Coupling a light path guide member for guiding the light emitted from the light source to the objective lens on the other side of the substrate, and guiding the light reflected from the recording surface to the light receiving unit; Pickup manufacturing method.

Images