JP3087352U - Optical pickup assembly equipment - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent displacement of the soldered light receiving element. A positioning pin for a light receiving element is projected from a jig body of a positioning jig with a magnet, and a concave portion for positioning a light receiving element is formed in the jig body. , The jig body 1
An elastic plate positioning pin 32 is juxtaposed at a predetermined interval from the light receiving element positioning pin 31 at 8a, and the light receiving element PD is detachably fitted into the concave portion 30 to contact the light receiving element positioning pin 31. The positioning pin 31 for the light receiving element is brought into contact with the inner side surface of the one protruding piece 3b, and the positioning pin 32 for the elastic plate is formed between the outer side surface of the one protruding piece 3b and the central through hole 12 of the elastic plate 2. It was made to fit between the peripheral edge.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to an apparatus for assembling an optical pickup in a disc player such as a CD and a DVD.

[0002]

[Prior art]

 FIG. 4 shows an example of an optical pickup. This is because a light receiving element PD composed of a photodiode IC is disposed on an end surface 1a of the housing 1 via an elastic plate 2 and a holder 3, and a collimator lens QWP and an objective lens are provided on the other end surface of the housing 1. A half mirror HM and a semiconductor laser LD are provided in the housing 1, and laser light from the semiconductor laser LD is transmitted to the disk D via a half mirror HM, a collimator lens QWP, and an objective lens OL. Then, the reflected light is received by the light receiving element PD, and information recorded on the disk D is read based on the received light signal.

A specific configuration of the optical pickup will be described with reference to FIG. 5 to FIG. 10. A plurality of projections 1 b are provided on an outer peripheral portion of an end surface 1 a of a housing 1, and each of the projections 1 b is provided. The holder 3 is adhered by an ultraviolet-curable adhesive 4.

The holder 3 includes a holder body 3a having a through hole 6 formed in the center thereof and a pair of holders 3 integrally projecting from the center of the holder body 3a along the horizontal horizontal direction X with the through hole 6 interposed therebetween. A projecting piece 3b, a substantially L-shaped pedestal portion 3c integrally extending from the base end portion of the holder main body 3a in a longitudinal sectional view, and a projecting portion 3d integrally projecting from the distal end portion and both side portions of the holder main body 3a. 3g, and an engagement hole 7 is formed on the upper surface of the pair of left and right protrusions 3f, 3g, and a predetermined opening angle α (90 ° in this embodiment) is formed on one side edge of the holder body 3a. A substantially V-shaped concave groove 8 is formed, and screw holes 9 and 10 are formed in the distal end portion of the holder main body 3a and the receiving base 3c.

The elastic plate 2 has an elastic plate main body 2 a penetrating a rectangular central through hole 12 and a base end integrally formed on the base end side of the elastic plate main body 2 a via a plurality of elastic rods 2 b. A fixed screw 14 is screwed into the screw hole 10 through the insertion holes 13 formed at both ends of the base end 2c. Accordingly, the base end 2c of the elastic plate 2 is fixed to the holder 3, and the adjusting screw 16 is screwed into the screw hole 9 through the concave portion 15 formed on the end face of the distal end 2d, whereby The portion 2d is fixed to the holder 3 so as to be adjustable in height.

The light receiving element PD is loosely fitted into the central through hole 12 of the elastic plate 2, and its terminal PDa is soldered 17 to a wiring (not shown) on the elastic plate 2, and the two projecting pieces 3 b Is bonded with an ultraviolet-curable adhesive 4 (see FIG. 5).

[0007] Conventionally, there is a technique for assembling an optical pickup described in Japanese Patent Application Laid-Open No. 2-81334, and an example thereof will be described. FIG. 11A shows a jig 18 for positioning a light receiving element PD. A jig main body 18a, a magnet 18b embedded in the jig main body 18a, and an operating shaft 18c protruding from the jig main body 18a. Is adsorbed to the jig body 18a (see FIG. 11B).

The assembly procedure of the optical pickup will be described. As shown in FIGS. 12 and 13 (a), the holder 3 is placed on a positioning table 20 having a through hole 19, and is mounted on a receiving section 3 c of the holder 3. By fixing the base end 2c of the elastic plate 2 with the fixing screw 14 and screwing the adjusting screw 16 through the recess 15 of the elastic plate 2 into the screw hole 9 of the holder 3, the elastic plate 2 can be moved in the vertical direction. The height h of Z is roughly adjusted (see FIG. 8).

Next, as shown in FIG. 12, the light receiving element PD attracted to the positioning jig 18 is loosely fitted into the central through hole 12 from above the elastic plate 2, and the terminal PDa of the light receiving element PD is connected to the elastic plate. Then, soldering 17 is performed on the wiring 2 (see FIG. 13B).

Subsequently, as shown in FIG. 13C, the positioning jig 18 is removed, the holder 3 is placed on the end surface 1 a of the housing 1, and the position is adjusted as shown by a virtual line in FIG. The tip of the bifurcated pin 21a of the tool 21 is engaged with the engaging hole 7 of the holder 3, and the holder 3 is slightly moved in the horizontal and horizontal directions X and the horizontal and vertical directions Y by the position adjusting tool 21 to receive light. By adjusting the light receiving portion of the PD to the reflected light from the semiconductor laser LD, and finely adjusting the defocus along the vertical direction Z by rotating the adjusting screw 16 forward and reverse, the light receiving element PD is moved from the semiconductor laser LD. Focus on the reflected light.

After that, as shown by a virtual line in FIG. 9, the ultraviolet curable adhesive 4 is injected between each protrusion 1 b of the housing 1 and the holder 3 by an injector 22, and FIG. As shown in the figure, the ultraviolet curable adhesive 4 is injected between each protruding piece 3b and the light receiving element PD by the injector 22 and is irradiated with ultraviolet light to cure each ultraviolet curable adhesive 4, thereby obtaining the light receiving element PD. Is fixed to the housing 1 via the holder 3 (see FIG. 5).

[0012]

[Problems to be solved by the invention]

 In the above configuration, as shown in FIG. 13B, the light receiving element PD adsorbed by the positioning jig 18 is loosely fitted into the central through hole 12 of the elastic plate 2 and the terminal PDa of the light receiving element PD is elastically connected. When soldering 17 to the wiring on the plate 2, the intervals t1 and t2 between the light receiving element PD and each protruding piece 3b may be irregular. Here, if t1 <t2, As shown in FIG. 5, the tensile force P2 due to the curing shrinkage of the ultraviolet curable adhesive 4 injected at the small interval t1 is smaller than the tensile force P2 due to the curing shrinkage of the ultraviolet curable adhesive 4 injected at the large interval t2. Is larger (P2 <P1), the light receiving element PD is drawn to the left side (small interval t1 side), and the positional relationship between the reflected light from the semiconductor laser LD and the light receiving section of the light receiving element PD, which has been made to match each other, is greatly reduced. Shift, light receiving element The reading of information by D there is a possibility that errors may occur.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide an optical pickup assembling apparatus in which a soldered light receiving element is not displaced.

[0014]

[Means for Solving the Problems]

 In order to achieve the above object, according to the present invention, a light receiving element is loosely fitted into a central through hole of an elastic plate attached to a holder so that the height thereof can be adjusted, and a terminal of the light receiving element is placed on the elastic plate. Soldering to wiring, positioning and bonding the holder on the end surface of the housing, and bonding the light receiving element to a pair of protruding pieces that are integrally protruded from the holder and face each other with the light receiving element interposed therebetween. An apparatus for assembling an optical pickup in which a laser beam is projected from a semiconductor laser onto a disc and the reflected light is received by the light receiving element, wherein a positioning jig with a magnet for adsorbing the light receiving element is provided. A positioning pin for a light receiving element is protruded from a jig body of the positioning jig, and a concave portion for positioning the light receiving element is formed in the jig body. The light receiving element position on the fixture body An elastic plate positioning pin is arranged side by side at a predetermined distance from the female pin, and the light receiving element is detachably fitted into the concave portion and is brought into contact with the light receiving element positioning pin. An element positioning pin is brought into contact with an inner surface of the one protruding piece, and the elastic plate positioning pin is fitted between an outer surface of the one protruding piece and a peripheral edge of a center through hole of the elastic plate. It is characterized by doing so.

According to the above configuration, the light receiving element is fitted into the concave portion of the positioning jig and is brought into contact with the positioning pin for the light receiving element, and the positioning pin for the light receiving element is attached to the inner surface of one of the protrusions of the holder. Just by making contact, the light receiving element can be precisely positioned at the center between the two projecting pieces, and the distance between the light receiving element and each projecting piece can be set uniformly. Accordingly, the tensile force due to the curing and shrinkage of the adhesive injected into the both spaces between the light receiving element and the two protruding pieces also becomes almost the same, and the light receiving element is pulled almost equally to both sides. Thus, since the light receiving element is not displaced, information can be accurately read by the light receiving element.

At the same time as the above operation, the positioning pin for the elastic plate protruding from the positioning jig is fitted between the outer surface of one of the projecting pieces and the peripheral edge of the central through hole of the elastic plate, and the center through hole of the central through hole is formed. By bringing the peripheral edge into contact with the elastic plate positioning pin, the elastic plate can be precisely positioned on the holder. In particular, the elastic plate positioning pin and the light receiving element positioning pin are spaced apart by a predetermined distance. The light receiving element and the elastic plate can be precisely positioned at the same time with respect to the holder only by fitting the two pins to one of the projections and fitting them together.

According to a second aspect of the present invention, a light receiving element is loosely fitted into a central through hole of an elastic plate attached to a holder so as to be adjustable in height, and terminals of the light receiving element are soldered to wiring on the elastic plate. Then, the holder is positioned on the end face of the housing and adhered thereto, and the light receiving element is adhered to a pair of protruding pieces which are integrally protruded from the holder and face each other with the light receiving element interposed therebetween. An apparatus for assembling an optical pickup in which a laser beam is projected from a laser beam onto a disk, and the reflected light is received by the light receiving element, comprising a positioning jig with a magnet for attracting the light receiving element. A positioning pin for the light receiving element is protruded from the jig body of the jig, and the light receiving element is attracted to the jig body by the attracting action of the magnet and is brought into contact with the positioning pin for the light receiving element. Device positioning The female pin is made to contact the inner surface of the one protruding piece.

According to the above configuration, the light receiving element is attracted to the jig body by the attracting action of the magnet and is brought into contact with the light receiving element positioning pin, and the light receiving element positioning pin is attached to the inner surface of the one protruding piece. By simply contacting the light receiving element, the light receiving element can be precisely positioned at the center between the two projecting pieces, and the both intervals between the light receiving element and each projecting piece can be set uniformly. Accordingly, the tensile force due to the curing shrinkage of the adhesive injected into both the spaces between the light receiving element and the two projecting pieces also becomes substantially the same, and the light receiving element is pulled almost equally to both sides. Thus, since the light receiving element is not displaced, information can be accurately read by the light receiving element.

According to a third aspect of the present invention, in the device of the second aspect, a concave portion for positioning a light receiving element is formed in the jig main body, and the light receiving element can be attached to and detached from the concave portion. And abuts the positioning pin for the light receiving element.

According to the above configuration, by fitting the light receiving element into the concave portion, the light receiving element can be positioned so as not to be unexpectedly moved on the jig body.

According to a fourth aspect of the present invention, in the device of the third aspect, an elastic plate positioning pin is juxtaposed to the jig main body at a predetermined distance from the light receiving element positioning pin. The elastic plate positioning pin is fitted between the outer surface of the one protruding piece and the peripheral edge of the center through hole of the elastic plate.

According to the above configuration, the elastic plate positioning pin is fitted between the outer surface of one of the projecting pieces and the peripheral edge of the central through hole of the elastic plate, and the peripheral edge of the central through hole is fitted to the elastic plate. The elastic plate can be precisely positioned on the holder by abutting the positioning pin. In particular, the elastic plate positioning pin and the light receiving element positioning pin are juxtaposed at a predetermined interval. Therefore, the light receiving element and the elastic plate can be precisely positioned at the same time with respect to the holder only by fitting the two pins so as to be sandwiched between the one projecting pieces.

[0023]

[Embodiment of the invention]

 1 to 3 show an optical pickup assembling apparatus according to an embodiment of the present invention, which has a positioning jig 18 with a magnet 18b for attracting a light receiving element. Since the configuration other than the above is substantially the same as the configuration shown in FIGS. 4 to 13, the same portions are denoted by the same reference numerals and description thereof will be omitted.

As shown in FIG. 1A, a concave portion 30 is formed on the bottom surface of the aluminum jig body 18 a of the positioning jig 18 for detachably fitting and positioning the light receiving element PD. A jig includes a light-receiving element positioning pin 31 abutting on an end face of the light-receiving element PD fitted in the concave portion 30 and a resilient plate positioning pin 32 parallel to the light-receiving element positioning pin 31 at a predetermined distance from the light-receiving element positioning pin 31. As shown in FIG. 1 (b), the light receiving element PD is fitted into the concave portion 30 to be adsorbed on the magnet 18b, and the end face of the light receiving element PD is connected to the light receiving element positioning pin 31 as shown in FIG. 2 and 3, the light-receiving element positioning pin 31 is brought into contact with the inner surface of one of the protruding pieces 3b, so that the light-receiving element PD adsorbed on the positioning jig 18 is brought into contact. The elastic plate 2 is positioned at the center between the two projecting pieces 3b and the positioning pin 32 for the elastic plate is fitted between the outer surface of one of the projecting pieces 3b and the peripheral edge of the central through hole 12 of the elastic plate 2. Is positioned on the holder 3.

According to the above configuration, the light receiving element PD is inserted into the concave portion 30 of the positioning jig 18 and is attracted to the magnet 18 b, and the light receiving element positioning pin 31 projecting from the positioning jig 18 is attached to the holder 3. The light receiving element PD is precisely positioned at the center between the two protruding pieces 3b by merely abutting the inner side surface of one of the protruding pieces 3b to form a gap t1 between the light receiving element PD and each of the protruding pieces 3b. , T2 can be set equally. Accordingly, the tensile forces P1 and P2 due to the curing shrinkage of the ultraviolet curable adhesive 4 injected into the gaps t1 and t2 between the light receiving element PD and the two projecting pieces 3b become substantially the same, and the light receiving element PD Are almost equally pulled to both sides (see FIG. 5). Thereby, since the light receiving element PD is not displaced, information can be accurately read by the light receiving element PD. In addition, since the jig body 18a is formed of aluminum having excellent heat radiating action, it is possible to prevent the light receiving element PD adsorbed on the jig body 18a from being overheated by the soldering 17.

At the same time as the above operation, the elastic plate positioning pin 32 projecting from the positioning jig 18 is fitted between the outer surface of the one protruding piece 3 b and the peripheral edge of the central through hole 12 of the elastic plate 2. By making the peripheral edge of the central through hole 12 abut against the elastic plate positioning pin 32, the interval t3 between one of the protruding pieces 3b and the peripheral edge of the central through hole 12 is set to be constant (FIG. 3), the elastic plate 2 can be accurately positioned with respect to the holder 3, and in particular, the elastic plate positioning pins 32 and the light receiving element positioning pins 31 are juxtaposed at a predetermined interval. Therefore, the light receiving element PD and the elastic plate 2 can be precisely positioned at the same time with respect to the holder 3 by fitting the two pins 31 and 32 so that the pins 31 and 32 are sandwiched between the one protruding pieces 3b.

The procedure of assembling the optical pickup will be described. As shown in FIG. 13A, the holder 3 is placed on the positioning table 20 and the base 3 c of the elastic plate 2 is mounted on the receiving section 3 c of the holder 3. The end 2c is fixed in a temporarily fixed state with the fixing screw 14, and the height h in the vertical direction Z of the elastic plate 2 is roughly adjusted by screwing the adjusting screw 16 (see FIG. 8).

Next, as shown in FIGS. 2 and 3, both positioning pins 31 and 32 protruding from a positioning jig 18 to which the light receiving element PD is sucked are applied to the inner and outer side surfaces of one protruding piece 3 b. At the same time, the peripheral edge of the central through hole 12 of the elastic plate 2 is brought into contact with the elastic plate positioning pin 32, and the fixing screw 14 is firmly screwed into the light receiving element PD and the elastic plate 2 with respect to the holder 3. Are precisely positioned at the same time, and the terminal PDa of the light receiving element PD is soldered 17 to the wiring on the elastic plate 2.

Subsequently, as shown by phantom lines in FIGS. 13C and 9, the positioning jig 18 is removed, the holder 3 is placed on the end surface 1 a of the housing 1, and The tip of the bifurcated pin 21a is engaged with the engagement hole 7 of the holder 3, and the holder 3 is slightly moved in the horizontal and horizontal directions X and Y by the position adjuster 21 to receive the light of the light receiving element PD. The light receiving element PD is made to reflect the reflected light from the semiconductor laser LD by making the portion coincide with the reflected light from the semiconductor laser LD and finely adjusting the defocus along the vertical direction Z by rotating the adjusting screw 16 forward and reverse. Focus on.

After that, as shown by a virtual line in FIG. 9, the ultraviolet curable adhesive 4 is injected between the respective projections 1 b of the housing 1 and the holder 3 by the injector 22, and FIG. As shown in the figure, the ultraviolet curable adhesive 4 is injected between each protruding piece 3b and the light receiving element PD by the injector 22 and is irradiated with ultraviolet light to cure each ultraviolet curable adhesive 4, thereby obtaining the light receiving element PD. Is fixed to the housing 1 via the holder 3 (see FIG. 5).

[0031]

[Effect of the invention]

 According to the invention of claim 1, the light receiving element is fitted into the concave portion of the positioning jig and is brought into contact with the light receiving element positioning pin, and the light receiving element positioning pin is attached to the inner surface of one of the protrusions of the holder. Just by making contact, the light receiving element can be precisely positioned at the center between the two projecting pieces, and the distance between the light receiving element and each projecting piece can be set uniformly. Accordingly, the tensile force due to the curing shrinkage of the adhesive injected into the both spaces between the light receiving element and the two projecting pieces also becomes almost the same, and the light receiving element is pulled almost equally to both sides. Accordingly, since the light receiving element is not displaced, the information can be accurately read by the light receiving element.

At the same time as the above operation, the positioning pin for the elastic plate protruding from the positioning jig is fitted between the outer surface of one of the protruding pieces and the peripheral edge of the center through hole of the elastic plate. By bringing the peripheral edge into contact with the elastic plate positioning pin, the elastic plate can be precisely positioned on the holder. In particular, the elastic plate positioning pin and the light receiving element positioning pin are spaced apart by a predetermined distance. The light receiving element and the elastic plate can be precisely positioned at the same time with respect to the holder only by fitting the two pins to one of the projections and fitting them together.

According to the invention of claim 2, the light receiving element is attracted to the jig main body by the attracting action of the magnet and is brought into contact with the light receiving element positioning pin. The light receiving element can be precisely positioned at the center between the two protruding pieces by simply abutting the inner surface of the protruding piece, so that both intervals between the light receiving element and each protruding piece can be set uniformly. Therefore, the tensile force due to the curing shrinkage of the adhesive injected into both the spaces between the light receiving element and the two projecting pieces also becomes substantially the same, and the light receiving element is pulled almost equally to both sides. Thereby, since the light receiving element is not displaced, information can be accurately read by the light receiving element.

According to the third aspect of the present invention, by fitting the light receiving element into the concave portion, the light receiving element can be positioned so as not to be unexpectedly moved on the jig body.

According to the present invention, the positioning pin for the elastic plate is fitted between the outer surface of the one protruding piece and the peripheral edge of the central through hole of the elastic plate, and the peripheral edge of the central through hole is fitted. By contacting the elastic plate positioning pins, the elastic plate can be accurately positioned on the holder. In particular, the elastic plate positioning pins and the light receiving element positioning pins are arranged side by side at a predetermined interval. Therefore, the light receiving element and the elastic plate can be simultaneously and precisely positioned with respect to the holder only by fitting the two pins so as to be sandwiched between the one protruding pieces.

[Brief description of the drawings]

FIG. 1A is a perspective view of a main part showing an optical pickup assembling apparatus according to an embodiment of the present invention, and FIG. 1B is a perspective view of a state where the light receiving element is attracted.

FIG. 2 is a transverse sectional view showing a positioning state of the light receiving element.

FIG. 3 is a view taken along the line AA in FIG. 2;

FIG. 4 is a schematic view showing the principle of an optical pickup.

FIG. 5 is a plan view of the optical pickup.

FIG. 6 is an exploded perspective view of the optical pickup.

FIG. 7 is an exploded perspective view of a main part of the optical pickup.

8 is a view taken in the direction of arrows BB in FIG. 5;

FIG. 9 is a view as viewed in the direction of arrows CC in FIG. 5;

FIG. 10 is a view as viewed in the direction of arrows DD in FIG. 5;

FIG. 11A is a perspective view showing a conventional positioning jig, and FIG. 11B is a perspective view showing a state in which a light receiving element is attracted to the positioning jig.

FIG. 12 is a longitudinal sectional view showing a state in which the height of the elastic plate is adjusted.

13 (a) to 13 (c) are plan views showing an assembling procedure.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 housing 2 elastic plate 3 holder 4 ultraviolet curable adhesive 12 center through hole of elastic plate 17 soldering 18 positioning jig 18 b magnet 30 concave of positioning jig 31 positioning pin for light receiving element 32 positioning pin for elastic plate PD light receiving Element D Disk LD Semiconductor laser t1 Distance between light receiving element and one projection piece t2 Distance between light receiving element and the other projection piece

Claims (4)

[Utility model registration claims] 1. A light receiving element is loosely fitted into a central through hole of an elastic plate attached to a holder so as to be adjustable in height, and a terminal of the light receiving element is soldered to a wiring on the elastic plate. Positioned and adhered on the end face, and the light receiving element is adhered to a pair of protruding pieces which are integrally protruded from the holder and opposed to each other with the light receiving element interposed therebetween, and project laser light from a semiconductor laser onto a disk. And an assembling apparatus for an optical pickup in which the reflected light is received by the light receiving element.
A positioning jig with a magnet for adsorbing the light receiving element; a positioning pin for the light receiving element is protruded from a jig main body of the positioning jig; and a positioning jig for positioning the light receiving element on the jig main body. A concave portion is formed, and a positioning pin for an elastic plate is juxtaposed in the jig main body at a predetermined interval from the positioning pin for the light receiving element, and the light receiving element is detachably fitted into the concave portion. The positioning pin for the light receiving element is brought into contact with the positioning pin for the light receiving element, and the positioning pin for the light receiving element is brought into contact with the inner surface of the one protruding piece. An optical pickup assembling apparatus characterized in that it is fitted between the plate and a peripheral edge of a central through hole. 2. A light receiving element is loosely fitted into a central through hole of an elastic plate attached to a holder so as to be adjustable in height, and a terminal of the light receiving element is soldered to a wiring on the elastic plate. Positioned and adhered on the end face, and the light receiving element is adhered to a pair of protruding pieces which are integrally protruded from the holder and opposed to each other with the light receiving element interposed therebetween, and project laser light from a semiconductor laser onto a disk. And an assembling apparatus for an optical pickup in which the reflected light is received by the light receiving element.
A positioning jig with a magnet for attracting the light receiving element is provided, and a positioning pin for the light receiving element is protruded from a jig main body of the positioning jig, and the light receiving element is attached to the jig main body by an attraction action of the magnet. An assembling apparatus for an optical pickup, characterized in that the light-receiving element positioning pin is attracted to and brought into contact with the light-receiving element positioning pin, and the light-receiving element positioning pin is brought into contact with the inner surface of the one protruding piece. 3. A concave portion for positioning a light receiving element is formed in the jig main body, and the light receiving element is detachably fitted into the concave portion so as to abut on the light receiving element positioning pin. 3. The optical pickup assembling apparatus according to claim 2, wherein: 4. A positioning pin for an elastic plate is juxtaposed on the jig main body at a predetermined distance from the positioning pin for the light receiving element, and the positioning pin for the elastic plate is attached to the outside of the one protrusion. 4. The optical pickup assembling apparatus according to claim 3, wherein the apparatus is fitted between a side surface and a peripheral edge of a center through hole of the elastic plate.