JP3879859B2 - Laser diode holder - Google Patents

Description

  The present invention relates to a laser diode holder, and more particularly to a laser diode holder used as a light source of an optical pickup for irradiating a disk surface with light.

  FIG. 5 is an explanatory diagram for explaining a general configuration of an optical pickup of an optical disk recording / reproducing apparatus such as a DVD player. As shown in the figure, in the optical pickup, in addition to an actuator provided with an objective lens 4 on a frame 1 to which a light receiving element 3 and a laser diode 2 as a light source are attached, a diffraction grating 5, a half mirror 6, An optical system element such as a collimator lens 7 is mounted, and the laser light of the laser diode 2 is irradiated onto the disk surface D through the diffraction grating 5, the half mirror 6, the collimator lens 7 and the objective lens 4, and the reflected light is irradiated. Then, the light is guided to the light receiving element 3 through the collimator lens 7 and the half mirror 6. The quality of the recording / reproducing performance with respect to the disk surface D is affected by whether or not the optical path by the optical system element is properly formed. Therefore, in the assembly process for attaching and fixing the laser diode 2 to the frame 1, the laser diode holder to which the laser diode 2 is fixed is aligned in the vertical and horizontal directions and the direction of the optical axis of the laser light of the laser diode 2 is adjusted. To be done.

  Therefore, various techniques relating to the laser diode mounting structure in the optical pickup and its optical axis adjustment have been proposed (see, for example, Patent Documents 1 to 6).

  Patent Document 1 shows that a mounting plate (holder) in which a semiconductor laser (laser diode) is fastened with two screws is attached to a head body (frame) using a plurality of coil springs and adjusting screws. According to this, the optical axis shift of the semiconductor laser can be corrected by rotating an arbitrary adjusting screw.

  In Patent Document 2, an operation plate on which a laser diode is mounted is integrated with a holder that is aligned and superposed on a base (frame) of an optical pickup in the vertical and horizontal directions and then bonded and fixed to the mounting surface with an adhesive. It is described that the inclination angle of the laser diode is corrected by operating the adjusting screw to change the inclination of the operation plate.

  Patent Document 3 describes that a holder part to which a semiconductor laser element is attached is attached to a base part so as to be tiltable, and the optical axis of the semiconductor laser element is adjusted by tilting the holder part by rotating a screw. ing.

  Patent Document 4 describes that an LD (laser light emitting element: laser diode) is attached to an adjustment base screwed to an optical head (frame), and the inclination of the adjustment base is adjusted by operating an adjustment screw. Has been.

Patent Documents 5 and 6 describe that the inclination of the LD unit is adjusted using a spherical surface. Patent Document 5 also refers to an adjustment assembly apparatus for a hologram LD unit.
JP-A-2-220228 Utility Model Registration No. 3098794 JP 2004-171627 A Japanese Patent No. 2835778 JP 2004-171627 A Japanese Patent No. 3085377

  However, as in Patent Documents 1 to 4, when adjusting the tilt angle of a laser diode using an adjustment screw or a coil spring, not only an adjustment screw or a coil spring is required, but the adjustment work is skillful. It becomes a difficult task. Further, in the case of using a spherical surface as in Patent Documents 5 and 6, high accuracy is required for forming the spherical surface, and the cost is increased.

  Among them, in the technique described in Patent Document 2, a laser diode is attached to a holder that is aligned and superposed on a base (frame) in the vertical and horizontal directions and then bonded and fixed to the mounting surface by an adhesive. Since the operation plate is integrally connected by a narrow elastic connecting piece formed as a bridge connecting the two, the operation plate is formed integrally with the holder, although an extra adjustment screw is used. Therefore, it can be said that the number of parts can be reduced.

  However, in the technique described in Patent Document 2, the elastic connecting piece is twisted against elasticity by rotating the adjusting screw in the process of correcting the tilt angle of the laser diode. May break, and the elastic connecting piece may be broken or accidentally twisted when handling the single unit of the operation plate and holder, making it unusable. There is a risk of falling.

  The present invention has been made under the above circumstances, and when the laser diode holder is attached to the frame, it is possible to easily adjust the position of the laser diode in the vertical and horizontal directions or the tilt angle of the laser diode. Moreover, it is an object of the present invention to provide a laser diode holder that does not require the use of an adjusting screw or a spherical surface for adjusting the tilt angle of the laser diode.

  Another object of the present invention is to provide a laser diode holder that requires two parts, ie, a holder body and a fixture, and that can be easily handled at low cost. To do.

  In addition, an object of the present invention is to provide a laser diode holder capable of increasing the heat dissipation efficiency of a laser diode that requires heat dissipation.

  The laser diode holder according to the present invention is an optical element for forming an optical path for irradiating a disk surface with laser light from a laser diode as a light source through an objective lens and guiding the reflected light to the light receiving element through the objective lens. Is attached to the mounting surface of the frame on which is mounted. And this laser diode holder is divided into a holder main body having a mounting hole for holding the laser diode in a press-fitted state, and a metal plate mounting for holding the holder main body in a swingable manner. It has a flat plate part that is aligned and overlapped with the flat mounting surface of the frame in the vertical and horizontal directions and then joined and fixed to the mounting surface by an adhesive, and the swing angle with respect to the fixture is adjusted on the flat plate part By doing so, there is provided a joint part for joining and fixing the holder body with the tilt angle of the laser diode adjusted by an adhesive.

  With this configuration, vertical and horizontal alignment can be performed by overlapping and sliding the flat plate portion of the fixture holding the holder body on the flat mounting surface of the frame. It is possible to easily and accurately adjust the position of the laser diode in the (X-axis direction and Y-axis direction) using the assembly apparatus. Further, since the holder body is swingably held by the fixture that has been aligned in the vertical and horizontal directions, the tilt angle of the laser diode can be easily adjusted by swinging the holder body. Also, the flat plate portion of the fixture is bonded and fixed to the mounting surface of the frame with an adhesive, and the holder body after adjusting the tilt angle of the laser diode is bonded and fixed to the bonded portion of the flat plate portion with an adhesive. The laser diode holder can be attached to the frame without using a coil spring.

  In the present invention, the flat plate portion of the fixture is formed in a horizontally long substantially rectangular shape having a size covering the front surface of the horizontally long holder body, and the bonding portion is formed at the end in the longitudinal direction of the flat plate portion. It is desirable to have a protruding piece. According to this, the heat generated by the laser diode is transmitted through the holder main body to the flat plate portion of the fixture to be radiated. In that case, since the flat plate portion is formed in a horizontally long substantially rectangular shape with a size covering the front surface of the holder body, a large heat radiation area of the flat plate portion is ensured and high heat dissipation performance is exhibited.

  In the present invention, the metal plate forming the fixture has elasticity, and the holder main body is elastically pressed between the upper and lower rearward protruding pieces bent at both ends of the flat plate in the width direction. The projections formed on the upper and lower surfaces of the holder body are individually fitted in the shaft holes formed in the rearward projecting pieces, and the holder body swings on the fixture. It is desirable that it be held as possible. According to this, since the holder body is securely positioned in the vertical and horizontal directions with respect to the fixture, the vertical and horizontal alignment of the laser diode can be accurately performed only by attaching the fixture to the frame in the vertical and horizontal directions. To be done.

  The laser diode holder according to the present invention is further embodied by adopting the following configuration. That is, mounting of a frame on which an optical system element is mounted to form an optical path for irradiating the disk surface with laser light from a laser diode as a light source through the objective lens and guiding the reflected light to the light receiving element through the objective lens A laser diode holder attached to a surface, having a horizontally long holder body having a mounting hole for holding the laser diode in a press-fitted state, and a sheet metal fixture having elasticity that holds the holder body in a swingable manner. The fixture has a flat plate portion that is aligned and overlapped with the flat mounting surface of the frame in the vertical and horizontal directions and is bonded and fixed to the mounting surface by an adhesive, and this flat plate portion is It is formed in a horizontally long substantially rectangular shape with a size covering the front surface of the holder body, and is attached to each of both ends in the longitudinal direction of the flat plate portion with respect to the fixture. The holder body, which has the laser diode tilt angle adjusted by adjusting the moving angle, is provided with a rearward projecting piece that forms a joint part for joining and fixing with an adhesive. The holder main body is elastically clamped between the upper and lower rearward protruding pieces that are bent, and the holder main body is positioned in the width direction with respect to the flat plate portion, and is established in each of the rearward protruding pieces. Projections formed on the upper and lower surfaces of the holder body are individually fitted in the shaft holes, and the holder body is swingably held by the fixture. A rear-expanding guide member for guiding the holder body pushed between the rearward projecting pieces, and between the guide guide piece and the shaft hole. Over and is further embodied by a guide groove for guiding the projection into the shaft hole is formed.

  In particular, in the present invention, the upper and lower rearward projecting pieces are provided with a rear-expanding calling guide piece that guides the holder main body that is pushed between the rearward protruding pieces, and extends between the calling guide piece and the shaft hole. Thus, with the configuration in which the guide groove for guiding the projection to the shaft hole is formed, the process for holding the holder body on the fixture can be easily and accurately performed.

  As described above, according to the present invention, when the laser diode holder is attached to the frame, it is possible to easily adjust the position in the vertical and horizontal directions by the assembling apparatus and the tilt angle of the laser diode. Since there is no need to use an adjusting screw or a spherical surface for adjusting the tilt angle of the diode and the number of parts is reduced accordingly, a laser diode holder or an optical pickup using the laser diode holder can be provided at low cost. In addition, according to the present invention, since the fixture functions also as a high-performance heat radiating component, there is an effect that the heat radiation efficiency of the laser diode that requires heat radiation is increased.

  1 is an exploded perspective view of a laser diode holder A according to an embodiment of the present invention, FIG. 2 is a rear view of the laser diode holder A, FIG. 3 is a cross-sectional view of a portion taken along line III-III in FIG. FIG. 4 is a cross-sectional view of a portion taken along line IV-IV in FIG. 2.

  As shown in FIG. 1, the laser diode holder A has a holder body 10 made of a horizontally-oriented substantially rectangular die-cast product made of aluminum and elasticity formed by punching a sheet metal material or bending it. And the attachment tool 30.

  The holder body 10 is provided with an attachment hole portion 11 penetrating in the thickness direction in the center portion in the longitudinal direction. By utilizing the press-fitting surface 12 provided in the attachment hole portion 11, the holder main body 10 is virtually shown in FIG. As indicated by the lines, the laser diode 50 formed as a package is held in a press-fit state. Further, concentric circular protrusions 13 and 14 are integrally formed on the upper surface and the lower surface of the holder body 10, whereas the front surface of the holder body 10 is predetermined on both the left and right sides of the protrusions 13 and 14. The relief slopes 15 and 16 are provided with a relief slope.

  On the other hand, the fixture 30 has a flat plate portion 31 that is formed in a horizontally long substantially rectangular shape that covers the front surface of the holder body 10, and the top portion of the laser diode 50 is located at the longitudinal center of the flat plate portion 31. While the opening 32 is inserted in a circular shape, rearward projecting pieces 33 and 34 are cut and formed at the left and right ends in the longitudinal direction. These rearward projecting pieces 33 and 34 not only serve as reinforcing ribs for increasing the deformation resistance of the flat plate portion 31, but also increase the bonding area when the flat plate portion 31 is bonded to the frame 1 with an adhesive. This is a part useful for increasing the bonding strength and increasing the bonding strength by increasing the bonding area when the holder body 10 is bonded to the flat plate portion 31 with an adhesive. In other words, the joint portions 33a and 34a for joining and fixing the holder main body 10 are formed by the locations where the rearward projecting pieces 33 and 34 are formed.

  Backward protruding pieces 41 and 45 are bent at the upper edge central portion and the lower edge full length portion of the flat plate portion 31, respectively, and inclined rearwardly at the rear ends of the rearward protruding pieces 41 and 45. The incoming guide pieces 42 and 46 are continuously provided. The upper and lower rearward projecting pieces 41 and 45 are provided with circular shaft holes 43 and 47 into which the upper and lower protrusions 13 and 14 on the holder body 10 side are fitted separately without rattling. Between the guide guide pieces 42 and 46 and the shaft holes 43 and 47, guide grooves 44 and 48 formed of slits are formed. Note that the upper and lower rearward projecting pieces 41 and 45 exert an action of elastically holding the holder body 10 fitted between them in the vertical direction.

  In the process of assembling the holder main body 10 and the fixture 30 described above, the center part in the longitudinal direction of the holder main body 10 is fitted between the upper and lower guide guide pieces 42 and 46, and then the holder main body 10 is pressed to Divide between the rearward protruding pieces 41 and 45. When this operation is performed, the upper protrusion 13 of the holder main body 10 is guided by the upper guide groove 44 on the fixture 30 side and fitted into the shaft hole 43, and the lower protrusion 14 of the holder main body 10 is It is guided by the guide groove 48 on the lower side of the fixture 30 and is fitted into the shaft hole 47. Therefore, the workability when the protrusions 13 and 14 are fitted into the shaft holes 43 and 47 is remarkably improved by the action of the guide grooves 44 and 48 provided on the fixture 30 side.

  When the holder main body 10 is thus attached to the fixture 30, the holder main body 10 is elastically clamped by the upper and lower rearward projecting pieces 41, 45 of the fixture 30, and the upper and lower shaft holes 43, 47 on the fixture 30 side. Since the upper and lower projections 13 and 14 on the holder body 10 side are fitted to each other without rattling, the holder body 10 is positioned in the longitudinal direction and the width direction of the flat plate portion 31 of the fixture 30. Yes. Therefore, as shown in FIGS. 3 and 4, the flat plate portion 31 superimposed on the mounting surface 1A of the frame 1 is slid in the vertical direction (Y direction) and the horizontal direction (X direction) on the mounting surface 1A. When the position adjustment is performed by aligning in the vertical and horizontal directions, the holder body 10 is also adjusted in the vertical and horizontal directions together with the fixture 30.

  The alignment of the flat plate portion 31 in the vertical and horizontal directions as described above is performed by using an assembly device that exhibits a positioning function. In this case, the vertical and horizontal alignment is performed by superimposing the flat plate portion 31 on the mounting surface 1A. Therefore, the position adjustment operation using the assembly apparatus can be performed easily and accurately.

  After aligning the mounting tool 30 in the vertical and horizontal directions with respect to the mounting surface 1A using an assembly device that exhibits a positioning function, a predetermined amount of ultraviolet-curing adhesive or the like is placed at a suitable position across the mounting tool 30 and the mounting surface 1A. By applying the adhesive, the fixture 30 is bonded and fixed to the attachment surface 1A. In this case, since the mounting member 30 has the flat plate portion 31 overlapping the mounting surface 1A, it is convenient to join and fix both at the overlapping portion. As the joining locations, for example, the four corners of the flat plate portion 31, the locations where the rearward protruding pieces 33 and 34 are formed, and other locations can be appropriately selected.

  Thus, after the fixture 30 is aligned and fixed to the mounting surface 1A in the vertical and horizontal directions, the tilt angle of the laser diode 50 is adjusted. This inclination angle adjustment is performed through a step of swinging the holder body 10 around the fitting portion between the protrusions 13 and 14 and the shaft holes 43 and 47. And after performing such an inclination adjustment, it adhere | attaches bonding parts 33a, 34a formed by the holder main body 10 and the rear protrusions 33, 34 by the side of the fixture 30, such as an ultraviolet curing adhesive By applying the agent, the holder body 10 is bonded and fixed to the fixture 10.

  As described above, in this embodiment, the fixture 30 is bonded and fixed to the mounting surface 1A of the frame 1 with an adhesive, and the holder main body 10 held by the fixture 30 is bonded and fixed to the fixture 30 with an adhesive. Therefore, it is not necessary to use a screw for attaching the laser diode 50 to the frame 1, and it is not necessary to use an adjustment screw, a spring, a spherical surface or the like for adjusting the tilt angle of the laser diode 50.

  In this embodiment, the fixture 30 is made of sheet metal, and the fixture 30 is provided with a flat plate portion of a size that covers the front surface of the holder body 10 and upper and lower rearward protruding pieces 41 and 45. Therefore, when this fixture 30 is evaluated from the viewpoint of heat dissipation performance, it serves as an excellent heat dissipation member for efficiently dissipating heat generated by the laser diode 50 with a large heat dissipation area.

It is a disassembled perspective view of the laser diode holder which concerns on embodiment of this invention. It is a rear view of the laser diode holder. It is sectional drawing of the part which follows the III-III line of FIG. It is sectional drawing of the part which follows the IV-IV line | wire of FIG. It is explanatory drawing for demonstrating the general structure of an optical pick-up.

Explanation of symbols

A Laser diode holder D Disk surface 1 Frame 1A Mounting surface 2,50 Laser diode 3 Light receiving element 4 Objective lens 10 Holder body 11 Mounting hole 13, 14 Protrusion 30 Mounting tool 31 Flat plate portion 33, 34 Backward projecting piece 33a, 34a Joining Portions 41 and 45 Backward projecting pieces 42 and 46 Guide guide pieces 43 and 47 Shaft holes 44 and 48 Guide grooves

Claims (4)

Laser light from a laser diode as a light source is irradiated onto a disk surface through an objective lens, and the reflected light is applied to a mounting surface of a frame on which an optical system element is formed to guide the reflected light to the light receiving element through the objective lens. A laser diode holder to be attached,
It is divided into a horizontally long holder body having a mounting hole for holding the laser diode in a press-fitted state, and a sheet metal fitting having elasticity for holding the holder body in a swingable manner.
The fixture has a flat plate portion which is bonded and fixed to the mounting surface by an adhesive after being aligned and superimposed on the flat mounting surface of the frame in the vertical and horizontal directions,
The flat plate portion is formed in a horizontally long substantially rectangular shape with a size covering the front surface of the holder main body, and the swing angle with respect to the fixture is adjusted to each of both longitudinal end portions of the flat plate portion. A rear-facing protrusion that forms a joint for fixing the holder body with the tilt angle of the laser diode fixed by an adhesive is provided.
The holder body is elastically clamped between upper and lower rearward projecting pieces that are bent at the center of both ends in the width direction of the flat plate portion, and the holder main body is positioned in the width direction with respect to the flat plate portion. In addition, the projections formed on the upper and lower surfaces of the holder body are individually fitted in the shaft holes formed in the rearward projecting pieces, and the holder body is swingably held by the fixture. Has been
The upper and lower rearward projecting pieces are provided with a rear-expanding guiding guide piece that guides the holder body that is pushed between the rearward projecting pieces, and between the guiding guide piece and the shaft hole, A laser diode holder, characterized in that a guide groove for guiding the protrusion to the shaft hole is formed. Laser light from a laser diode as a light source is irradiated onto a disk surface through an objective lens, and the reflected light is applied to a mounting surface of a frame on which an optical system element is formed to guide the reflected light to the light receiving element through the objective lens. In the laser diode holder to be attached,
It is divided into a holder body having a mounting hole for holding the laser diode in a press-fit state, and a metal plate mounting tool for holding the holder body in a swingable manner.
The fixture has a flat plate portion that is aligned and superimposed on the flat mounting surface of the frame in the vertical and horizontal directions, and is bonded and fixed to the mounting surface by an adhesive. A laser diode holder, comprising: a joining portion for joining and fixing a holder main body, the tilt angle of which is adjusted by adjusting a moving angle, with an adhesive. The flat plate portion of the fixture is formed in a horizontally long substantially rectangular shape with a size covering the front surface of the horizontally long holder body, and a rearward projecting piece that forms the joint portion is provided at the longitudinal end portion of the flat plate portion. The laser diode holder according to claim 2. The metal plate forming the fixture has elasticity, and the holder body is elastically clamped between upper and lower rearward protruding pieces bent at both ends of the flat plate portion in the width direction. In addition, projections formed on the upper and lower surfaces of the holder body are individually fitted in the shaft holes formed in the rearward projecting pieces, and the holder body is swingably held by the fixture. The laser diode holder according to claim 3.

Images