KR20080005028A - Device for assembling prism to pick-up base - Google Patents

Abstract

An optical part assembling device of an optical pick-up is provided to control a direction of the optical pick-up, and to set optical parts accurately by rotating a clamping unit in a tangential direction with a tangential optical axis adjusting unit and rotating the clamping unit in a radial direction with a radial optical axis adjusting unit. An optical part assembling device of an optical pick-up comprises a support unit, a guiding unit, a tangential optical axis adjusting unit(6), and a radial optical axis adjusting unit(13). The support unit supports an optical pick-up base(7). The guiding unit guides optical parts to a predetermined position on the optical pick-up base. The tangential optical axis adjusting unit rotates the clamping unit in a tangential direction and adjusts the optical axis of the optical parts. The radial optical axis adjusting unit rotates the clamping unit in a radial direction and adjusts the optical axis of the optical parts.

Description

Optical pick-up assembly device for optical pickup {Device for assembling prism to pick-up base}

1 is a plan view of the assembly apparatus of the present invention.

Figure 2 is a front view of the assembly apparatus of the present invention.

Figure 3 is an illustration of the adjusting device of the present invention.

Explanation of symbols on the main parts of the drawings

3 ..... Zig arm 6 ..... Tangential direction

7 ..... optical pickup base 9 ..... base support spindle

10 ..... Optics 11 ..... Base Support Shaft

12 ..... Vertical jig 13 ..... Radial direction

15 ..... Tangential rotation stage 16 ..... Radial rotation stage

The present invention relates to an optical component (prism) assembly apparatus for optical pickup used for recording and reproducing an optical recording medium, and more particularly, an assembly apparatus configured to be assembled in a state in which the prism is adjusted to the exact position of the pickup base. It is about.

The drive device of the optical recording medium is provided with a pickup device for recording or reproducing a signal on the recording medium. Such an optical pickup apparatus includes an optical component such as a prism, which is installed to change the path of light inside the optical pickup apparatus. At this time, in order to accurately change the optical path to the initially designed value, the reflective surface of the optical component (prism) must be assembled at the correct position of the optical pickup base.

Conventionally, when mounting an optical component (prism) on the optical pickup base, the prism is fixed to the mounting protrusion formed on the optical pickup base using a jig. Of course, the complete fixing of the prism is made by the UV-curable adhesive applied on the base, but the initial positioning is made using the mounting protrusions formed on the optical pickup base as described above.

However, according to the conventional optical component assembly method, it is pointed out that the assembly error occurs in accordance with the processing precision of both. That is, accurate positioning is difficult due to the accuracy of the optical pickup base for mounting the optical component, the mounting protrusion formed on the optical pickup base, and the dimensional tolerance of the optical component.

For example, when considering the importance of the optical axis in the optical pickup of the optical recording medium, the base mounting projection and the appearance of the optical component should have a precision of 20㎛ or less. However, it is practically very difficult to process the shape of the optical pickup base to be injection molded and the optical part to be machined to within the precision as described above.

According to the conventional method, the center of the optical component must be pushed to the mounting protrusion of the optical pickup base. In this case, there is a possibility of contamination of the optical component, which may appear as a disadvantage of increasing the defective rate of the entire production. In addition, certain limitations are pointed out in miniaturization of the optical pickup base itself due to the presence of the seating protrusion.

In view of the above precision, it can be said that in order to fix the optical component (prism) at the correct position of the base, it is also necessary to adjust the orientation of the optical component to be seated.

It is an object of the present invention to provide an apparatus capable of seating an optical component in the correct position of the optical pickup base.

Another object of the present invention is to provide a device capable of adjusting the orientation of the optical pickup, the original position can be precisely set when the optical component is seated and fixed to the optical pickup base.

Still another object of the present invention is to provide an apparatus capable of meeting the trend of miniaturization and thinning by simplifying the structure of the optical pickup base on which the optical component is mounted.

An optical component assembling apparatus of an optical pickup according to the present invention for achieving the above object, the support means for supporting the optical pickup base; Guide means for guiding and positioning the optical component to a predetermined position on the optical pickup base; Clamping means for holding an optical component mounted on the optical pickup base; A tangential direction optical axis adjusting means capable of rotating the clamping means in a tangential direction to adjust an optical axis of the optical component; And a radial direction optical axis adjusting means capable of rotating the clamping means in a radial direction to adjust an optical axis of the optical component.

According to another embodiment, an optical component assembling apparatus of an optical pickup includes: support means capable of supporting an optical pickup base; Guide means for guiding and positioning the optical component to a predetermined position on the optical pickup base; Clamping means for holding an optical component mounted on the optical pickup base; And a tangential direction optical axis adjusting means capable of rotating the clamping means in the tangential direction to adjust the optical axis of the optical component.

Here, the tangential direction optical axis adjusting means includes a tangential direction rotating stage which rotates in association with a tangential direction optical axis adjusting shaft which is coaxial with the optical part, and the tangential direction rotating stage clamps the optical part. It is configured to rotate the clamping means. Wherein the radial direction optical axis adjustment means is interposed between the clamping means and the tangential rotation stage; A radial direction rotation stage which is rotatably supported on an outer surface of the tangential rotation stage and is installed to interlock with a radial direction optical axis adjustment screw that coincides with the center of the optical component in the radial direction and on top of the radial direction axis adjustment screw. It is configured to include.

According to still another embodiment, an optical component assembling apparatus of an optical pickup includes: support means capable of supporting an optical pickup base; Guide means for guiding and positioning the optical component to a predetermined position on the optical pickup base; Clamping means for holding an optical component mounted on the optical pickup base; And a radial direction optical axis adjusting means capable of rotating the clamping means in a radial direction to adjust an optical axis of the optical component.

Wherein the radial direction optical axis adjustment means includes a radial direction optical axis adjustment axis rotatably supported coaxially with the optical component in the radial direction, and a radial direction rotation stage interlocked with the radial direction optical axis adjustment axis; The radial rotation stage is configured to rotate the clamping means clamping the optical component in the radial direction.

And according to another embodiment, it further comprises a holding means for pressing the optical parts mounted on the optical pickup base by the guide means downward to maintain the position. The holding means may be configured as a vertical jig capable of lifting up and down to press downward the upper surface of the optical component mounted on the optical pickup base.

According to the embodiment of the clamping means, it is composed of a pair of fingers, one side of the pair of fingers is fixed, the other side is configured to be movable by a pneumatic cylinder.

And according to the embodiment of the guide means, it is composed of an injection hole formed so as to pass through the optical component on the opposing surface of the pair of fingers, through the injection hole the optical component is separated to the optical pickup base in a predetermined position Can be maintained.

In addition, according to the embodiment of the support means for supporting the optical pickup base, it is composed of a base support spindle and a base support shaft that is fitted into the through hole of the guide block formed on both sides of the optical pickup base.

According to the present invention as described above, it is possible to set the optical axis of the optical component fixed to the optical pickup base to a position precisely adjusted in the radial direction and the tangential direction. In addition, the optical pick-up base does not require a separate protrusion for mounting the optical component, which is substantially simplified, thereby fully opening the possibility of miniaturization.

Next, the present invention will be described in more detail with reference to the embodiments shown in the drawings.

2 is an exemplary plan view of the apparatus according to the invention, and FIG. 3 is an exemplary front view of the apparatus according to the invention. As shown, the apparatus according to the present invention is for accurately seating and fixing the optical component (prism) 10 to the optical pickup base 7.

The optical pick-up base 7 is fixed to the apparatus by using guide blocks 7a and 7b formed on both sides thereof. Through holes are formed in the guide blocks 7a and 7b. The guide blocks 7a and 7b are fixed by fitting the through holes to the base support main shaft 9 and the base support subshaft 11. The main shaft 9 and the sub shaft 11 are supported, for example, in a horizontal state by a fixed block Ba fixed to the frame of the apparatus.

In order to prevent the optical pickup base 7 fixed to the main shaft 9 and the sub shaft 11 from being separated from the main shaft 9 and the sub shaft 11, a release preventing clamp 8 is provided. . The release preventing clamp (8) can be moved up and down in the fixed block (Ba) in the vertical direction, and is installed rotatably around the support shaft (8a). The hook portion 8b formed at the end of the release preventing clamp 8 is rotated about the support shaft 8a by raising and lowering the release preventing clamp 8 up and down, or the main shaft 9. Contact with the end of the guide block (7b) fitted in the), thereby preventing the optical pickup base (7) from being separated. In this way, the optical pickup base 7 is maintained in a fixed state, and in this state, an optical component (prism) is mounted on the upper surface of the optical pickup base 7.

The optical component 10 may be accurately positioned on the optical pickup base 7 by the support arm 14. That is, the support arm 14 has a pair of fingers 14a and 14b. The fingers 14a and 14b are configured to clamp the optical component 10 therebetween, and an injection hole 14A through which the optical component 10 is vertically passed is formed at an end thereof. The injection holes 14A are simultaneously formed on opposing surfaces of the pair of fingers in a shape corresponding to the cross section of the optical pickup, thereby allowing the optical component 10 to pass vertically and positioned on the optical pickup base 7. You can.

In the illustrated embodiment, the injection holes 14A may have portions 14c and 14d respectively formed at portions of the pair of fingers 14a and 14b facing each other, and allow the optical component 10 to pass through as a whole. So that it is formed. In the illustrated embodiment, the optical component 10 has a quadrangular cross section, and the injection hole 14A is configured to be formed in a quadrangle with the fingers 14a and 14b on both sides thereof facing each other. have. The optical component 10 passing through the injection hole 14A is raised to be orthogonal to the upper surface of the pickup base 7.

The support arm 14 has a configuration in which the pair of fingers 14a and 14b can clamp the optical component 10. For example, the support arm 14 includes a main body 14B supporting the fingers 14a and 14b, and a pneumatic cylinder is built in the main body 14B. And the finger 14a of one side is fixed to the main body 14B, and the other finger 14b is comprised by the pneumatic cylinder in the main body 14B so that it can be moved by a fixed space relatively. Therefore, when the finger 14b of the other side is fixed by the pneumatic cylinder to move closer to or away from the finger 14a while the one finger 14a is fixed, the pair of fingers 14a and 14b are The optical component 10 can be clamped.

The support arm 14 is connected to a radial direction stage 16. The radial direction stage 16 is rotatable about the radial direction optical axis adjustment shaft 13 within a predetermined angle range. The radial direction stage 16 is rotatably supported by the radial direction optical axis adjustment shaft 13. Therefore, the radial direction stage 16 may rotate for a predetermined period about the radial direction optical axis adjustment shaft 13. Here, the rotation in the radial direction means the direction of rotation about the radial direction optical axis adjustment axis 13.

The center of the radial direction optical axis adjustment shaft 13 is provided to coincide with the center of the optical component 10. Therefore, when the rotating stage 16 is rotated about the radial direction optical axis adjustment shaft 13, the optical component 10 in the state clamped to the support arm 14 is the direction as indicated by the arrow (R) That is, it is possible to rotate by a predetermined angle in the radial direction as described above, through this rotation it is possible to accurately position the optical component 10.

A fixed block Bb connected to a frame (not shown) of the apparatus of the present invention is provided with a tangential direction optical axis adjusting shaft 6. On the tangential direction optical axis adjustment shaft 6, the tangential direction rotation stage 15 of a horizontal direction is provided in the figure. The tangential direction here means the direction which rotates about the tangential direction optical-axis adjustment axis 6 which is a vertical direction, as shown by the arrow T. As shown in FIG.

The outer side of the tangential rotation stage 15 extends slightly upward, and the radial direction optical axis adjustment shaft 13 described above is rotatably supported on the upper surface. That is, the radial direction optical axis adjustment shaft 13 is supported to be rotatable on the tangential rotation stage 15 through, for example, a bearing or the like. As described above, the radial direction optical axis adjustment shaft 13 is provided to be interlocked with the radial direction rotation stage 16. Therefore, the radial direction pre-rotation stage 16 and the radial direction optical axis adjustment shaft 13 are within the range where no interference occurs with the lower tangential direction rotation stage 15, that is, the tangential direction rotation stage 15. It will be able to rotate for a certain period within the angle range corresponding to the top.

A vertical jig 12 that is movable up and down is provided at an upper portion corresponding to the position of the insertion opening 14A of the support arm 14. The vertical jig 12 is installed at a position substantially corresponding to the upper portion of the optical component 10, and is pressed onto the optical pickup base 7 by pressing the optical component 10 downward from the upper end thereof. It is installed so that. The vertical jig 12 is supported to the fixed block Ba or the frame of the apparatus of the present invention (not shown), and is installed to move up and down a predetermined section in a vertical direction by a pneumatic cylinder, a hydraulic cylinder or a servomotor, and a ball screw. .

Next will be described with respect to the operation of the optical component assembly of the present invention having the configuration as described above.

First, when the optical component 10 is inserted through the insertion opening 14A of the jig arm 14 provided at an upper portion with a predetermined distance from the optical pickup base 7, the optical pickup base 7 is placed at the assembly position of the optical pickup base 7. The component 10 is placed away. At this time, if the optical part 10 does not maintain the upright state accurately because the top surface of the optical pickup base 7, that is, the bottom surface of the portion where the optical part 10 is located, the vertical jig ( 12) is lowered to press down the optical part 10 can be maintained in the correct position.

When the optical component 10 is determined to be seated at the correct position through the optical axis inspection, the optical component 10 is fixed to the optical pickup base 7 at the position. An adhesive is already applied to the corresponding portion of the upper surface of the optical pickup base 7. In this case, as the adhesive for bonding the optical component 10, it is common to use a UV curable adhesive. When the optical part 10 is irradiated with ultraviolet rays in the state in which the optical part 10 is standing upright on the optical pickup base 7, the UV-curable adhesive is cured and the optical part 10 is accurately fixed on the optical pickup base 7. .

If it is determined that the optical axis of the optical component 10 is not set correctly, optical axis adjustment is performed. This optical axis adjustment can be considered by dividing into two cases in the assembly process of the optical component 10. As mentioned above, the case where optical axis adjustment in a tangent direction is needed as mentioned above can be considered. In other words, since the optical axis is accurate in the radial direction, there is no need to adjust, and the optical part 10 can be accurately fixed by adjusting the optical axis only in the tangent direction.

In this case, first, while the vertical jig 12 is holding the optical part 10 while pressing it from the top or in the state where the optical part is standing correctly, the optical jig 14 is used for the optical part ( Clamp 10). That is, as described above, the optical component 10 is clamped to the pair of fingers 14a and 14b by driving one of the fingers 14a or 14b driven by pneumatic pressure.

In this state, the operator rotates the tangential rotation stage 15. When the tangential direction rotating stage 15 is rotated, the whole is rotated in the tangential direction about the tangential direction optical axis adjusting shaft 6. Accordingly, the radial direction stage 16 and the jig arm 14 are rotated as a whole. At this time, since the center of rotation of the tangential rotation stage 15 is substantially coincident with the center of the optical part 10, the optical part 10 has no positional movement, but only in the tangential direction. It can rotate. In this way, when the optical component 10 is seated in the correct position, the adhesive is cured due to the irradiation of ultraviolet rays so that the optical component 10 is completely fixed on the optical pickup base (7). Here, the tangential rotation can be performed manually by the operator, and the correct position can be set while performing the optical axis inspection.

When the optical axis of the optical component 10 is not accurate in the radial direction, the optical axis adjustment with respect to the radial direction should be performed. In this case, the radial direction stage 16 is moved in the radial direction as indicated by the arrow R with respect to the radial direction optical axis adjustment shaft 13. The radial direction stage 16 is provided coaxially with the optical component 10, so that the radial direction stage 16 can be adjusted within a predetermined angle range in the radial direction indicated by the arrow R. FIG. Do. And this adjustment substantially leads to the adjustment of the optical component 10, and through the optical axis inspection it will be possible to determine the correct optical axis in the radial direction.

And if the optical axis adjustment in the radial direction and the tangential direction is necessary at the same time, by performing the above-described operation simultaneously or sequentially, the optical component 10 has an accurate position on the optical pickup base (7) It becomes possible. In addition, when the exact position of the optical component 10 is determined, the adhesive is cured by irradiation of ultraviolet rays, so that the optical component 10 is fixed on the optical pickup base 7 as described above.

Here, when the pair of fingers 14a and 14b of the jig arm 14 clamp the optical component 10, it is preferable to hold the non-use surface of the optical component 10. The non-use surface of the optical component 10 can be grasped in this manner through the design of the injection port 14A of the jig arm 14. Thus, by clamping the non-use surface of the optical component 10, it is possible to prevent the contamination of the optical component as much as possible.

When the optical axis adjustment of the steel part 10 is actually performed, the tangential direction rotation stage 15 is formed by rotating the tangential direction optical axis adjustment axis 6 and the radial direction optical axis adjustment axis 13. ) And the radial rotation stage 16 is rotated in an extremely small range. Therefore, it is a difficult task for the actual operator to perform extremely fine optical axis adjustment by rotating the optical axis adjusting shafts 6 and 13. Therefore, it is preferable to attach a separate control mechanism for finely adjusting the optical axis adjustment shaft (6, 13).

For example, as shown in FIG. 3, in the vicinity of the tangential direction optical axis adjusting shaft 6, an adjusting device 20 capable of finely rotating the optical axis adjusting shaft 6 is provided. The adjusting device 20 is configured to include a manipulation handle 22 for the user to rotate the operation, and a linear transfer unit 25 for linear movement in accordance with the rotation of the manipulation handle (22). The operation handle 22 is coupled to the fixed portion 23 in a screwing manner, and the rear end thereof is connected to the linear transfer portion 25. Therefore, when the manipulation handle 22 is rotated, the linear movement is performed with respect to the fixed portion 23 in the fixed state. Since the rear end of the operation handle 22 is connected to the linear transfer part 25, the linear transfer part 25 ultimately straightens a predetermined distance corresponding to the rotational movement of the operation handle 22. It will reciprocate. This configuration has substantially the same principle as the known micrometer, and corresponds to the pitch of the screw due to the rotational angle based on the screwing method of the operation handle 22 and the fixing portion 23, the straight line. The transfer part 25 is conveyed. Therefore, it becomes possible to adjust the fine linear feed amount.

In addition, the minute linear movement of the linear transfer part 25 causes the tangential direction optical axis adjustment axis 6 to rotate. For example, the linear transfer part 25 can finely rotate the tangential direction optical axis adjustment shaft 6 by pushing a projection formed on the outer side of the tangential direction optical axis adjustment shaft 6.

A scale portion 26 is formed at the rear of the manipulation handle 22, and a scale portion 28 is displayed at the linear transfer portion 23 adjacent to the scale portion 26 to display a linear feed amount. ) Is formed, it is possible to clearly know the linear transfer amount according to the rotation angle of the operation handle (22).

However, such an adjusting device 20 is only one embodiment, and any configuration may be sufficient as long as the tangential direction optical axis adjustment shaft 6 and the radial direction optical axis adjustment shaft 13 of the present invention can be finely adjusted. .

According to the present invention having the above-described configuration, the optical component 10 is optically picked up by adjusting the optical component in the tangential direction and the radial direction without the mounting projection being formed in the optical pickup base. It can be seen that the basic technical idea is that the base 7 can be set accurately.

Within the scope of the basic technical spirit of the present invention, it will be obvious that various modifications are possible to those skilled in the art, and the protection scope of the present invention should be interpreted based on the appended claims. will be.

According to the present invention as described above it can be expected the following effects.

It can be seen that the present invention can be adjusted to have an accurate optical axis that has the most basic effect on the performance of the optical pickup. In other words, the assembly of the conventional optical parts depends on the degree of processing of the optical parts, the dimensional accuracy of the mold forming the base, and the like, but it is not entirely accurate. This enables accurate setting of the optical component. This can be said to substantially improve the performance of the optical pickup and at the same time improve the reliability of the product to which it is applied.

The optical pickup base according to the present invention does not have a mounting protrusion for mounting an optical component. Therefore, it is natural to simplify the structure of the optical pickup base, and it is possible to expect more advantageous advantages in miniaturization and thinning of the optical pickup base.

In addition, according to the present invention, when the jig arm clamps the optical component, it is possible to clamp the non-use surface of the optical component as described above. Therefore, by preventing the contamination of the optical component during assembly can be expected to reduce the defect rate in the manufacturing process and at the same time improve the reliability of the product.

Claims (13)

Support means for supporting an optical pickup base; Guide means for guiding and positioning the optical component to a predetermined position on the optical pickup base; Clamping means for holding an optical component mounted on the optical pickup base; A tangential direction optical axis adjusting means capable of rotating the clamping means in a tangential direction to adjust an optical axis of the optical component; And And a radial direction optical axis adjusting means capable of rotating the clamping means in a radial direction to adjust an optical axis of the optical part. Support means for supporting an optical pickup base; Guide means for guiding and positioning the optical component to a predetermined position on the optical pickup base; Clamping means for holding an optical component mounted on the optical pickup base; And And a tangential direction optical axis adjusting means capable of rotating the clamping means in a tangential direction to adjust an optical axis of the optical part. Support means for supporting an optical pickup base; Guide means for guiding and positioning the optical component to a predetermined position on the optical pickup base; Clamping means for holding an optical component mounted on the optical pickup base; And And a radial direction optical axis adjusting means capable of adjusting the optical axis of the optical part by rotating the clamping means in a radial direction. The apparatus of any one of claims 1 to 3, further comprising: holding means for pressing the optical parts mounted on the optical pickup base by the guide means downward to maintain the position thereof. Optical parts assembly device of optical pickup. The optical device according to any one of claims 1 to 3, wherein the clamping means is composed of a pair of fingers, one side of the pair of fingers is fixed, and the other side is movable by a pneumatic cylinder. Pick-up assembly device. According to claim 1 or 2, wherein the tangential direction optical axis adjusting means, And a tangential rotation stage rotating in conjunction with a tangential direction optical axis adjusting shaft installed coaxially with the optical component, wherein the tangential rotation stage rotates the clamping means for clamping the optical component. Optical parts assembly device of the optical pickup. 7. The radial direction optical axis adjusting means according to claim 6, Interposed between the clamping means and the tangential rotation stage; A radial direction rotation stage which is rotatably supported on an outer surface of the tangential rotation stage and is installed to interlock with a radial direction optical axis adjustment screw that coincides with the center of the optical component in the radial direction and on top of the radial direction axis adjustment screw. Optical component assembly apparatus of the optical pickup, characterized in that comprises a. The optical component assembling apparatus according to claim 5, wherein the guide means is an injection hole formed so as to allow the optical component to pass through the opposing surfaces of the pair of fingers. According to claim 3, wherein the radial direction optical axis adjustment means, A radial direction optical axis adjustment axis rotatably supported coaxially with the optical component in a radial direction, and a radial direction rotation stage interlocked with the radial direction optical axis adjustment axis; And said radial direction rotating stage is capable of rotating said clamping means clamping said optical component in a radial direction. The support means according to any one of claims 1 to 3, An optical component assembling apparatus for an optical pickup, comprising: a base support spindle and a base support shaft fitted into a through hole of a guide block formed on both sides of the optical pickup base. The optical component assembling apparatus according to claim 4, wherein the holding means is constituted by a vertical jig capable of lifting up and down to press the upper surface of the optical component mounted on the optical pickup base downward. . The optical component assembling apparatus according to any one of claims 1 to 3, wherein the guide means and the clamping means are integrally formed. The method of claim 12, wherein the clamping means, the one side is fixed and the other side is composed of a pair of fingers movable by the pneumatic cylinder; And the guide means is an injection hole formed to allow the optical component to pass through the opposing surfaces of the pair of fingers.

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