JP2014049159A - Adjustment method of optical pickup device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve highly accurate fine adjustment of a laser beam, which is difficult to achieve in a conventional optical pickup device because the clearance between a laser device arranged in a housing away from a diffraction grating and the diffraction grating changes.SOLUTION: In an optical pickup device, a first diffraction grating 4 is incorporated in a first laser device 2, both are finely adjusted in a housing while moving integrally with one another. The first laser device 2 includes an upper surface side held by a laser device holding assembly 40 and a lower surface side held by a position adjustment fixture. This structure allows the first laser device 2 to be finely adjusted with being stably held, and achieves highly accurate fine adjustment of the laser beam.

Description

  The present invention relates to a method for adjusting an optical pickup device that performs recording and / or reproduction using light of a plurality of types of wavelengths.

  As shown in FIG. 7, the conventional optical pickup device 61 is configured to, for example, use a BD (Blu-ray Disc), DVD (Digital Versatile Disk), or CD (Compact Disk) standard laser light for an optical disc (optical information recording medium). It has the function of condensing on the information recording layer, receiving the reflected light from the information recording layer, and converting it into an electrical signal.

  Specifically, the optical pickup device 61 includes a first laser device 62 that emits BD standard laser light, and a second laser device 63 that emits CD or DVD standard laser light. Laser light emitted from the first laser device 62 passes through the first diffraction grating 64, is reflected by the first half mirror 65, and then travels through a common optical path 66. The laser light emitted from the second laser device 63 passes through the second diffraction grating 67 and the second half mirror 68 and travels through a common optical path 66. Each laser beam is reflected by an optical disk (not shown), travels again on a common optical path 66, and is received by a common photodetector 69.

  In the optical pickup device 61, the optical path 66 is made common to the respective laser beams, and the optical elements such as the photodetector 69 are made common, thereby reducing the number of optical elements and realizing miniaturization thereof. (For example, refer to Patent Document 1).

JP 2012-74126 A (page 8-9, FIG. 1)

  As described above, in the conventional optical pickup device 61, for example, the optical axis adjustment of the BD standard laser light emitted from the first laser device 62, the spot position adjustment to the optical disc, and the like are performed. Fix the position. Thereafter, the optical axis adjustment of the CD standard or DVD standard laser beam emitted from the second laser device 63, the spot position adjustment to the optical disc, and the like are performed.

  At this time, in the second laser device 63, the optical axis adjustment and the like are already performed using the photodetector 69 whose position is already fixed in the housing. Since the second laser device 63 is finely adjusted in the XYZ axis direction within the housing, it is not bonded and fixed to the reference surface of the housing. Therefore, the separation distance between the second diffraction grating 67 and the second laser device 63 is likely to fluctuate due to the movement of the position of the second laser device 63. Further, there is a problem that it is difficult to adjust the position of the side spot on the light receiving element or the optical disk due to the variation in the separation distance.

  In particular, the second laser device 63 has a built-in CD standard laser diode and a DVD standard laser diode, and the light emitting points from which the respective laser beams are emitted are different. There is a problem that it is difficult to adjust the spot position on the optical disk.

  Further, since the second laser device 63 is finely adjusted in the X, Y, and Z axis directions within the housing, the second laser device 63 must move while being stably supported by a laser device holder or the like. In this case, there is a problem that high-precision adjustment is difficult.

  In view of the above-described circumstances, the optical pickup apparatus adjustment method according to the present invention includes a first laser device including a first laser element that emits a first laser beam, and at least the first laser. A second laser device including a second laser element that emits a second laser beam having a wavelength different from that of the light; a first diffraction grating that diffracts the first laser beam; and a second diffraction that diffracts the second laser beam. The second laser device is prepared by preparing a grating and a common photodetection device that receives the first laser beam and the second laser beam guided onto a common optical path, and performing optical adjustment of the second laser beam. After fixing the second diffraction grating and the light detection device to the housing, the first laser device is fixed in a state where the upper surface of the first laser device is sucked and fixed by a laser device holder. The first laser device, which is disposed in a desired region of the housing and is temporarily fixed to the first diffraction grating while optically adjusting the first laser beam, is fixed to the housing, and only the first diffraction grating The first diffraction grating is fixed to the first laser device after optical adjustment of the first laser light while rotating the lens.

  In the present invention, the laser device holder finely adjusts the position of the laser device in a state where a region wider than the concave portion formed on the upper surface of the laser device is sucked, so that the laser light can be finely adjusted with high accuracy. It becomes possible.

  Further, in the present invention, the recess formed by the eject pin is arranged in the suction area of the laser device holder, so that even if burrs are generated in the recess, the suction state is prevented from deteriorating. The

  Moreover, in this invention, a laser apparatus can be moved stably by hold | maintaining the upper and lower surfaces of a laser apparatus with a laser apparatus holder and a position adjustment jig.

  In the present invention, a laser device incorporating a diffraction grating is used, and the separation distance between the diffraction grating and the light emitting point of the LD is fixed, so that fine adjustment of the laser light can be performed with high accuracy.

  Further, in the present invention, a laser device incorporating a diffraction grating is used. Even after the laser device is fixed to the housing, the rotation of the diffraction grating can be adjusted, and the laser light can be finely adjusted with high accuracy.

It is the schematic explaining the optical system of the optical pick-up apparatus in embodiment of this invention. BRIEF DESCRIPTION OF THE DRAWINGS (A) Perspective view and (B) Perspective view for explaining an optical pickup device in an embodiment of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1A is a perspective view for explaining a laser device used in an optical pickup device according to an embodiment of the present invention, and FIG. It is a perspective view explaining the laser apparatus used for the optical pick-up apparatus in embodiment of this invention. It is (A) perspective view and (B) perspective view explaining the adjustment method of the optical pick-up apparatus in embodiment of this invention. It is a figure explaining the adjustment method of the optical pick-up apparatus in embodiment of this invention. It is the schematic explaining the optical system of the optical pick-up apparatus in conventional embodiment.

<First Embodiment>
With reference to FIGS. 1 to 4, an optical pickup device according to the present embodiment will be described.

  FIG. 1 is a schematic diagram illustrating an optical system of an optical pickup device. FIGS. 2A and 2B are perspective views for explaining the location of the laser device with respect to the housing of the optical pickup device. FIG. 3A is a perspective view illustrating a laser device used in the optical pickup device, and FIG. 3B is a cross-sectional view of the laser device shown in FIG. 4 is a perspective view for explaining members incorporated in the laser apparatus shown in FIG.

  In the following description, for example, the paper surface X-axis direction is the housing width direction (laser device lateral width direction), the paper surface Y-axis direction is the housing height direction (laser device vertical width direction), and the paper surface Z-axis direction. The direction is the depth width direction of the housing (the depth width direction of the laser device). The Z-axis direction on the paper surface coincides with the optical axis direction of the optical pickup device.

  As shown in FIG. 1, an optical pickup device 1 includes a BD (Blu-ray Disc), a DVD (Digital Versatile Disk), or a CD (Compact Disk) standard laser beam on an information recording layer of an optical disc (optical information recording medium). It has a function of condensing and receiving the reflected light from the information recording layer and converting it into an electrical signal.

  The optical pickup device 1 includes various optical elements built in a housing. The optical elements include first and second laser devices 2 and 3, first and second diffraction gratings 4 and 5, optical path synthesis prism 6, half mirror 7, quarter wavelength plate 8, collimator lens 9, first The first and second raising mirrors 10 and 11, the first and second objective lenses 12 and 13, the anamorphic lens 14 and the photodetector 15 are shown.

  The first laser device 2 is a laser beam having a DVD standard wavelength (red wavelength band 645 nm to 675 nm (for example, 655 nm)) and a CD standard wavelength (infrared wavelength band 765 nm to 805 nm (for example, 785 nm)). Is emitted. Although details will be described later, the first diffraction grating 4 is incorporated in the first laser device 2 via a rotating member (not shown).

  Then, the laser light emitted from the first laser device 2 is separated into 0th order light, + 1st order diffracted light, and −1st order diffracted light by the first diffraction grating 4, and passes through the optical path synthesis prism 6.

  The second laser device 3 emits laser light having a BD standard wavelength (blue-violet (blue) wavelength band of 400 nm to 420 nm (for example, 405 nm)). The second laser device 3 may be a CAN type package or a lead frame type package.

  Then, the laser light emitted from the second laser device 3 is separated into 0th order light, + 1st order diffracted light, and −1st order diffracted light by the second diffraction grating 5 and reflected by the polarization plane of the optical path combining prism 6. To do.

  As shown in the drawing, the laser beams emitted from the first and second laser devices 2 and 3 travel on the common optical path 16 after passing through the optical path combining prism 6. Specifically, each laser beam is reflected by the half mirror 7 and then passes through the quarter-wave plate 8 and the collimator lens 9. The laser light of the DVD standard and the CD standard is reflected by the first rising mirror 10 and is condensed on the information recording layer of the optical disc 17 by the first objective lens 12. On the other hand, the BD standard laser light passes through the first rising mirror 10, is reflected by the second rising mirror 11, and is condensed on the information recording layer of the optical disc 17 by the second objective lens 13. The

  Next, the DVD standard and CD standard laser light reflected from the optical disc 17 passes through the first objective lens 12 and is reflected by the first rising mirror 10. On the other hand, the BD standard laser light reflected from the optical disc 17 passes through the second objective lens 13, is reflected by the second raising mirror 11, and passes through the first raising mirror 10. Thereafter, each laser beam passes through the collimator lens 9, the quarter-wave plate 8, the half mirror 7, and the anamorphic lens 14 and then enters a photodetector (PDIC) 15. Based on the optical signal detected by the photodetector 15, focus control, tracking control, and radial tilt control are performed.

  As described above, in the optical pickup device 1, the optical path 16 is made common to the respective laser beams, and the common optical elements 6 to 9, 14, and 15 are used, thereby reducing the number of optical elements, The miniaturization is realized.

  FIG. 2A shows a perspective view from the upper surface side of the optical pickup device 1. For example, the upper surface side of the resin housing 18 is covered with a metal cover 19. Although not shown, the housing 18 is partitioned by side walls or the like for arranging various optical elements. The first laser device 2 is disposed in a partitioned area 20 in the housing 18. Further, the second laser device 3 is disposed in a recess 21 provided along the side surface of the housing 18. In practice, the upper surface of the first laser device 1 is covered with a cover 19.

  First, the second laser device 3 that emits BD standard laser light is bonded and fixed to the housing 18. At this time, the side surface in the recess 21 of the housing 18 is formed as a parallel surface of the reference surface in the paper XYZ axial direction, and the second laser device 3 is pressed and fixed to these side surfaces. Thereafter, the second diffraction grating 5 disposed in the housing 18 is rotated and adjusted to adjust the optical axis direction of the BD laser beam, adjust the optical axis azimuth angle θ, and position the side spot on the optical disc. Adjustments are made.

  Next, the first laser device 2 that emits the DVD standard and CD standard laser light is disposed in a desired region 20 of the housing 18. Although the details will be described later, the first laser device 2 is disposed in the region 20 with its upper surface side held by a laser device holder (not shown). As shown in FIG. 2B, the adjustment hole 22 is disposed at a position corresponding to the region 20 on the lower surface side of the housing 18. The first laser device 2 is supported at its lower surface side by a position adjusting jig (not shown) inserted from the adjusting hole 22 into the housing 18, and its position is finely adjusted. Adjustment of the optical axis direction of the laser light and adjustment of the optical axis azimuth angle θ are performed. Thereafter, the first diffraction grating 4 incorporated in the first laser device 2 is rotationally adjusted in the direction perpendicular to the optical axis direction, thereby adjusting the side spot position on the optical disc.

  As shown in FIG. 3 (A), the first laser device 2 includes a laser diode (hereinafter referred to as LD) in its casing 31, and the LD is fixed on a stem (not shown). The The side surface 32 of the housing 31 is formed as a parallel surface of the reference surface in the paper plane XY direction, and is a surface perpendicular to the optical axis direction (Z-axis direction). The rotating member 33 is pressed and fixed by the leaf spring 34 so as to contact the side surface 32. With this structure, in the temporarily fixed state by the leaf spring 34, the rotation member 33 is restricted from moving in the optical axis direction (the Z-axis direction on the paper surface) and along the side surface 32 (along the reference surface in the XY direction on the paper surface). Only) Rotation is possible. The rotating member 33 is bonded and fixed to the housing 31 after adjusting the rotation (after adjusting the spot position on the optical disk).

  The first diffraction grating 4 is bonded and fixed to the rotating member 33 and rotates integrally with the rotating member 33. As described above, the movement of the rotating member 33 in the optical axis direction with respect to the first laser device 2 is restricted, and the separation distance between the light emitting point of the LD and the first diffraction grating 4 in the optical axis direction is a constant distance. Fixed to.

  A pair of recesses 36 and 37 are disposed on the upper surface 35 of the housing 31. The cross section of the recess 36 is circular. The cross section of the concave portion 37 has a rectangular shape having a diameter width of the circle in the Z-axis direction on the paper surface and extending in the X-axis direction on the paper surface, and the circular semicircular shape on both sides of the rectangular paper surface in the X-axis direction. The shape is a combination. And the recessed parts 36 and 37 become an area | region where the projection part (not shown) of a laser apparatus holder is inserted when installing the 1st laser apparatus 2 in a housing. Note that the upper surface 35 of the housing 31 is formed as a parallel surface of the reference surface in the paper ZX direction.

  Further, as indicated by a circle S, a plurality of concave portions for bonding with the housing are provided on the side surface of the housing 31. By providing an uneven shape in the bonding recess, the surface area as the bonding region is increased, and the bonding strength is improved.

  3B is a cross-sectional view taken along the line AA of FIG. 3A and shows the upper surface 35 side of the housing 31, and between the recesses 36 and 37 of the upper surface 35 of the housing 31, A recess 38 that is shallower than the recesses 36 and 37 is disposed. And the recessed part 38 is a hollow area | region formed by pressing with the eject pin (not shown) when releasing the housing | casing 31 from a metal mold | die. A region indicated by a circle 39 is an end portion pressed by an eject pin at the time of mold release, and is a region where burrs are most likely to occur. The region is located on the inner side of the peripheral end portion of the recess 38 and lower than the upper surface 35 of the housing 31.

  On the holding surface of the laser device holder 40 indicated by the dotted line, a pair of protrusions 41 and 42 and one suction part are arranged between them. The pair of protrusions 41 and 42 are fitted into the recesses 36 and 37, and the suction part sucks the upper surface 35 of the housing 31. As shown in the figure, the concave portion 37 has the above-described shape, so that the protrusion 42 is fitted into the concave portion 37 in the Z-axis direction on the paper surface, and holds a plurality of laser devices with different separation distances between the protrusions 41 and 42. Can also be used for tools. In addition, by making the opening end part of the recessed parts 36 and 37 into a taper shape, the operation | work which inserts the said projection parts 41 and 42 in the recessed parts 36 and 37, and the drawing | extracting work from the recessed parts 36 and 37 becomes easy.

  As shown in the drawing, the suction area W1 by the suction portion of the laser device holder 40 has a wider area than the recess 38, and the recess 38 is included in the suction area W1. As shown in FIG. 3A, the sand-like hatched area on the upper surface 35 is an adsorption area S <b> 1 by the suction part of the laser device holder 40. With this structure, even when burrs are generated in the region indicated by the circle 39, the burrs are accommodated in the recess 38, and the burrs are hardly applied to the adsorption region S1, thereby preventing the suction force from being reduced.

  Note that, in the region indicated by the circle 39, the burr is formed when the metal material at the time of molding the housing slightly enters the clearance for the eject pin to move in the mold.

  As shown in FIG. 4, the casing 31 of the first laser device 2 is formed by injection molding a metal material such as a zinc alloy, for example. The housing 31 has a hollow structure because the LD is built therein.

  As shown in the figure, a cylindrical opening 43 through which laser light passes is formed on the side surface 32 of the housing 31, and a pair of protrusions 44 and 45 are formed on both sides of the opening 43. . The protrusions 44 and 45 have, for example, a cylindrical shape and protrude in the Z-axis direction on the paper surface. The protrusion 44 is used as a rotation fulcrum member of the rotation member 33, and the protrusion 45 is used as a rotation restriction member of the rotation member 33.

  The rotating member 33 is formed, for example, by injection molding a thermoplastic synthetic resin such as polycarbonate (Polycarbonate) having a lower hardness than the metal material of the casing 31. The front surface 46 and the rear surface 47 of the rotating member 33 are formed as parallel surfaces of the reference surface in the paper plane XY direction. Then, the back surface 47 of the rotating member 33 is disposed in contact with the side surface 32 of the housing 31, whereby the reference surface in the paper surface XY direction of the rotating member 33 is fixed.

  A cylindrical opening 48 is formed in the central region of the rotating member 33. When the opening 48 is fixed to the housing 31, the opening 48 is disposed at a position corresponding to the opening 43 of the housing 31, and the laser. This is the area where light passes.

  The rotating member 33 is formed with a cylindrical opening 49 at a position corresponding to the protrusion 44 of the housing 31. The opening shape of the opening portion 49 is a circular shape that is approximately the same as the cross-sectional shape of the protruding portion 44, but one end portion thereof has a D-cut shape.

  As described above, the casing 31 is made of a metal material, and the rotating member 33 is made of a resin material. Thus, when the protrusion 44 of the casing 31 is fitted into the opening 49 of the rotating member 33, The rotating member 33 in the D-cut shape portion is cut. Then, since the protrusion 44 is fitted into the opening 49 without any gap, the rotation member 33 rotates with the protrusion 44 as a rotation fulcrum, and the rotation position is not shifted, and high-precision fine adjustment is possible. It becomes.

  On the other hand, a U-shaped opening 50 is formed in the rotation member 33 at a position corresponding to the protrusion 45 of the housing 31. The rotating member 33 is disposed on the side surface 32 of the housing 31 such that the protrusion 45 is disposed in the opening 50. As described above, the rotating member 33 rotates on the side surface 32 of the casing 31, but the protruding member 45 prevents the rotating member 33 from rotating more than necessary.

  Next, on the surface 46 of the rotating member 33, projecting regions 51 and 52 are formed in the vertical direction of the opening 48, and the concave portion 53 between the projecting regions 51 and 52 is disposed in the first diffraction grating 4. It becomes an area. The surfaces 54 and 55 of the projecting regions 51 and 52 are formed as parallel surfaces of the reference surface in the paper plane XZ direction, and the first diffraction grating 4 is disposed in contact with the surfaces 54 and 55. The reference plane in the paper surface XZ direction of the first diffraction grating 4 is fixed.

  The leaf spring 34 is fitted into the recessed area 56 of the upper surface 35 and the lower surface (not shown) of the housing 31, and the belt-shaped portion that contacts the rotating member 33 is bent, so that the rotating member 33 is moved to the housing 31. It is held on the side surface 32 while being pressed to the side.

  In this embodiment, the case where a diffraction grating capable of rotation adjustment is incorporated in the first laser device incorporating the LD of the DVD standard and the CD standard has been described. However, the present invention is not limited to this case. . For example, a structure in which a diffraction grating capable of rotation adjustment is incorporated in a second laser device incorporating a BD-standard LD and a diffraction grating is not incorporated in the first laser device may be employed. In this case, the same effect can be obtained by first bonding and fixing the first laser device to the housing and then placing the second laser device in the housing with fine adjustment as described above. It is done.

Moreover, although the case where the diffraction grating is fixed to the rotating member and the rotating member is fixed to the side surface of the laser device has been described, the present invention is not limited to this case. For example, the diffraction grating may be directly fixed to the side surface of the laser device, and the diffraction grating itself may be rotationally adjusted. In addition, various modifications can be made without departing from the scope of the present invention.
<Second Embodiment>
With reference to FIG. 5 to FIG. 6, a method for adjusting the optical pickup device according to the present embodiment will be described. 5A and 5B are perspective views for explaining an optical adjustment method of a laser device used in the optical pickup device. FIG. 6 is a diagram for explaining the characteristics at the time of optical adjustment of the laser device shown in FIG. In the description of the present embodiment, the description of the first embodiment will be referred to as appropriate.

  As described above with reference to FIG. 2 of the first embodiment, after the second laser device 3 that emits BD standard laser light is bonded and fixed to the housing 18, laser light of DVD standard and CD standard is emitted. A first laser device 2 is arranged in the region 20 of the housing 18. Then, as shown in FIGS. 5A and 5B, the first laser device 2 monitors the output data from the photodetector fixed in position with respect to the laser light of the second laser device 3. However, the position of the housing 18 is adjusted in the XYZ axial directions.

  Specifically, first, as shown in FIG. 5A, a laser device holder 40 is prepared, and the protrusions 41 and 42 (see FIG. 3) are formed in the concave portion 36 on the upper surface 35 side of the first laser device 2. 37 (see FIG. 3) and the upper surface 35 of the outer periphery of the recess 38 (see FIG. 3) is adsorbed. At this time, the protrusions 41 and 42 of the laser device holder 40 are inserted into the recesses 36 and 37, so that the first laser device 2 is in the XYZ direction reference plane with respect to the laser device holder 40. Is fixed.

  Next, after the first laser device 1 is arranged in the region 20 (see FIG. 2A) in the housing 18, the upper surface 35 side is sucked and fixed by the laser device holder 40, and the lower surface side is eccentric. The first laser device 2 is finely adjusted as appropriate in the XYZ axial directions while being supported by a position adjusting jig 57 such as a pin. By this adjustment, the adjustment of the optical axis direction of the laser light and the adjustment of the optical axis azimuth angle θ are performed while the adjustment to the common optical path with the laser beam of the BD standard is performed. After the adjustment, the first laser device 2 is bonded and fixed to the housing.

  Next, as shown in FIG. 5B, after the first laser device 2 is bonded and fixed to the housing 18, the plate spring 34 is moved by a diffraction grating adjustment jig (not shown) such as an eccentric pin. The rotating member 33 in the temporarily fixed state is rotated. Then, as indicated by the arrow 58, the first diffraction grating 4 is rotationally adjusted in the direction perpendicular to the optical axis direction, thereby adjusting the side spot position on the optical disc.

  The first laser device 2 includes, for example, a DVD standard LD and a CD standard LD, and the light emission points of the respective LDs are different. High-precision fine adjustment is possible.

  At this time, the rotating member 33 is pressed and fixed to the side surface 32 of the housing 31 by the plate spring 34, so that when the rotating member 33 rotates, the rotating member 33 and the housing 31 are not rotated. A large frictional force works between them. Then, by rotating the rotating member 33 with the diffraction grating adjustment jig in a state where this frictional force is applied, it is possible to prevent the rotating member 33 from rotating excessively and to perform a very small amount of rotation adjustment. Become.

  Finally, after the position of the rotation member 33 is determined, the rotation member 33 is bonded and fixed to the first laser device 2.

  As described above, in the optical pickup device, by using the first laser device 2 in which the first diffraction grating 4 is incorporated, it is possible to perform two-stage laser light adjustment, and high accuracy of the laser light. Fine adjustment is possible.

  FIG. 6 is a diagram for explaining the amount of change in the pitch between the side spots on the light receiving element when the laser device is adjusted in the optical axis direction according to the light receiving element bonded and fixed in the housing. The X axis represents the adjustment amount (μm) in the optical axis direction of the laser device, and the Y axis represents the pitch (μm) between the side spots on the light receiving element.

  First, the solid line shows the case where a laser device incorporating a diffraction grating is used as shown in FIG. 3, and the diffraction grating moves integrally with the laser device in the direction of the optical axis, and the separation distance between them is always constant. Become.

  As shown in the figure, when the laser device is arranged at a predetermined position in the housing, the design value of the pitch on the light receiving element is 140 μm. When the laser device moved from the predetermined position in the optical axis direction by +0.1 μm, the pitch on the light receiving element was 141.11 μm, which was 1.11 μm wider than the design value. On the other hand, when the laser apparatus moved from the predetermined position in the optical axis direction by −0.1 μm, the pitch on the light receiving element was 138.92 μm, which was narrowed by 1.08 μm from the design value.

  Next, a dotted line is a case where a laser device in which the diffraction grating is fixed to the housing and the diffraction grating is not incorporated is used, and only the laser device moves in the optical axis direction, and the two are separated according to the movement. The distance varies.

  As shown in the figure, when the laser device is arranged at a predetermined position in the housing, the design value of the pitch on the light receiving element is 140 μm. When the laser apparatus moved +0.1 μm from the predetermined position in the optical axis direction, the pitch on the light receiving element was 147.90 μm, which was 7.90 μm wider than the design value. On the other hand, when the laser apparatus moved from the predetermined position in the optical axis direction by −0.1 μm, the pitch on the light receiving element was 132.12 μm, and the pitch was narrowed by 7.88 μm from the design value.

  As described above, the diffraction grating is incorporated in the laser device, and both of them move together, so that the amount of change in pitch on the light receiving element is greatly reduced. And since the amount of change in pitch is reduced, highly accurate fine adjustment of laser light is easily realized, and characteristic deterioration is prevented.

DESCRIPTION OF SYMBOLS 1 Optical pick-up apparatus 2 1st laser apparatus 3 2nd laser apparatus 4 1st diffraction grating 15 Optical detector 18 Housing 22 Adjustment hole 31 Case 33 Rotating member 34 Leaf spring 36 Recessed part 37 Recessed part 40 Laser apparatus holder 41 Projection part 42 Projection part 44 Projection part 45 Projection part 49 Opening part 50 Opening part 57 Position adjustment jig

Claims (5)

A first laser device including a first laser element that emits a first laser beam; a second laser device including a second laser element that emits a second laser beam having a wavelength different from that of at least the first laser beam; A first diffraction grating that diffracts the first laser light, a second diffraction grating that diffracts the second laser light, and the first laser light and the second laser light guided onto a common optical path are received. Prepare a common photodetection device,
A state in which the upper surface of the first laser device is sucked and fixed by a laser device holder after the second laser device, the second diffraction grating and the light detection device are fixed to the housing while performing optical adjustment of the second laser light. Then, the first laser device is disposed in a desired region of the housing, and the first laser device in which the first diffraction grating is temporarily fixed while performing optical adjustment of the first laser light is attached to the housing. Fixed,
An optical pickup apparatus adjustment method comprising: optically adjusting the first laser light while rotating only the first diffraction grating, and then fixing the first diffraction grating to the first laser apparatus.   A first recess formed by an eject pin is formed on the upper surface of the first laser device, the suction area of the laser device holder is wider than the area of the first recess, and the laser device holder is The method of adjusting an optical pickup device according to claim 1, wherein an upper surface of the first laser device around the first recess is sucked so as to include the first recess. A pair of second recesses and third recesses are formed on the upper surface of the first laser device so as to sandwich the first recesses, and a cross section of the second recesses is circular, and a cross section of the third recesses is Oval shape,
3. The method of adjusting an optical pickup device according to claim 2, wherein the pair of protrusions provided so as to sandwich the suction region of the laser device holder is inserted into the second and third recesses. . The first diffraction grating is fixed to a rotating member, and the rotating member is temporarily fixed to the first laser device by an elastic member;
4. The method of adjusting an optical pickup device according to claim 2, wherein the first laser device and the first diffraction grating are integrally moved and adjusted in the optical axis direction.   5. The method of adjusting an optical pickup device according to claim 4, wherein the rotating member rotates in a direction perpendicular to the optical axis direction integrally with the first diffraction grating.

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