JP2007179685A - Optical head device and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical head device capable of facilitating the positioning of an optical element mounted to an element holder even if a device frame is made small in size and thin in thickness. <P>SOLUTION: As for the optical head device 1, in a light receiving element holder 45 for mounting a signal detection light receiving element 40 to a device frame 2, a pair of projections 456 are protruded backward in inner positions separated from outer peripheral ends of a fixed plate 451 at a predetermined distance. Thus, when the projections 456 and 457 are held from the outside to hold the light receiving element holder 45, element holder grippers 47 and 48 are prevented from greatly bulging to the outside from the outer peripheral end of the fixed plate 451. Recessed parts 458 for applying temporary fixing adhesives are formed at four corners of the fixed plate part 451. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an optical head device for reproducing or / and recording an optical recording medium such as a CD or a DVD, and a method for manufacturing the same.

  In an optical head device used for reproduction and recording of an optical recording disk (optical recording medium) such as a CD or a DVD, a plurality of components are mounted on the device frame. As shown in FIG. Among them, for example, the signal detecting light receiving element 40A is mounted on the apparatus frame 2A via a plate-shaped element holder 45A. In order to fix such an element holder 45A to the wall surface of the apparatus frame 2A, for example, the upper and lower sides of the element holder 45A are gripped by the element holder gripping tool from both sides, and the signal detection light receiving element 40A is attached to the apparatus frame 2A. Positioning in the XY direction (in-plane position), Z direction (position in the optical axis direction), θz (angular position around the optical axis), θx, θy (tilt), etc. In this state, The apparatus frame 2A is bonded and fixed. Further, the both sides of the element holder 45A are gripped by the element holder gripping tool from both sides to position the signal detection light receiving element 40A with respect to the apparatus frame 2A. In this state, the element holder 45A and the apparatus frame 2A are bonded and fixed. Sometimes.

As an element holder for mounting the signal detection light receiving element on the apparatus frame, as shown in FIG. 9B, an element comprising a recess for mounting the signal detection light receiving element on the back side of the fixed plate portion 451B. An element holder 45B in which a mounting portion 455B is formed has been proposed. In this element holder 45B, a pin insertion V-groove 454B into which an adjustment pin is inserted is formed from the end of the fixed plate portion 451B to the rear. The raised portions 456B and 457B protrude. The element holder 45B is arranged so that the front surface is in contact with the wall surface of the apparatus frame, and then an adjustment pin is inserted into the pin insertion V-groove 544B, and the XY direction (in-plane position) of the element holder 45B and θz It is used to adjust the position with respect to (angular position around the optical axis) or the like (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 11-66608

  However, when the size and thickness of the apparatus frame are reduced in accordance with the demand for miniaturization and thinning of the optical head apparatus, a part of the apparatus frame 2A or the flexible substrate is positioned near the element holder 45A. Thus, since it becomes impossible to secure a space for the element holder gripper that holds the element holder 45A to enter, the element holder 45A shown in FIG. 9A cannot cope with the reduction in size and thickness of the optical head device. There is a problem.

  Further, in the element holder 45B shown in FIG. 9B, after the front surface is disposed so as to contact the wall surface of the apparatus frame, the XY direction (in-plane position), θz (angular position around the optical axis), etc. Therefore, it is impossible to adjust the Z direction (position in the optical axis direction), θx, and θy (tilt) of the element holder 45B. Similarly to the element holder 45A shown in FIG. 9A, the element holder 45B shown in FIG. 9B is also positioned with respect to the apparatus frame while holding the upper side and the lower side or both sides from both sides with the element holder holding tool. If it carries out, adjustment of the Z direction (position in an optical axis direction), (theta) x, and (theta) y (inclination) of the element holder 45B can be performed. However, even in this case, similarly to the element holder 45A shown in FIG. 9A, when a part of the apparatus frame or the flexible substrate is positioned in the vicinity of the element holder 45B, the element holder holding tool that holds the element holder 45B is Since the space for entering cannot be secured, there is a problem that the optical head device cannot be reduced in size and thickness.

  In view of the above problems, an object of the present invention is to provide an optical head device capable of easily positioning an optical element mounted on an element holder even when the apparatus frame is reduced in size and thickness. is there.

  In order to solve the above problems, according to the present invention, in the optical head device in which a plurality of parts for reproducing or / and recording information on an optical recording medium are mounted on an apparatus frame, the plurality of parts include elements. An optical element mounted on the device frame via a holder is included, and the element holder has a fixed plate portion that is bonded and fixed to the wall surface with the front surface facing the wall surface of the device frame, and a rear surface of the fixed plate portion Of the optical element on the side and both side regions sandwiching the optical element between the fixed plate portion and an inner position spaced a predetermined distance from the fixed plate portion toward the rear side And a pair of protruding protrusions.

  In the method of manufacturing an optical head device according to the present invention, when the element holder on which the optical element is mounted is fixed to the apparatus frame, the projection of the element holder is grasped from both sides with an element holder gripping tool and the optical holder is mounted. The element is positioned with respect to the device frame, and in this state, an adhesive is applied so as to straddle the fixed plate portion and the device frame.

  In the present invention, when the element holder is fixed to the apparatus frame, the optical element is positioned with respect to the apparatus frame by grasping the protrusion with the element holder grasping tool from both sides. Here, the pair of protrusions protrudes rearward at an inner position spaced a predetermined distance from the outer peripheral end of the fixed plate portion. For this reason, the element holder gripping tool is located slightly inside the outer peripheral end of the fixed plate portion with the pair of protrusions gripped from both sides, or slightly even when protruding beyond the outer peripheral end of the fixed plate portion. It only protrudes and does not protrude greatly. Therefore, when the device frame is reduced in size and thickness as the optical head device is reduced in size and thickness, a part of the device frame or a flexible substrate is located near the place where the element holder is mounted. Even when the element holder is held, the element holder holding tool holding the element holder can enter. Therefore, the optical element can be positioned in a state where the element holder on which the optical element is mounted is gripped by the element holder gripping tool, so that the element holder is lifted from the wall surface of the apparatus frame, for example, the light of the optical element. The position and inclination in the axial direction can be adjusted, and in this state, the element holder can be bonded and fixed to the wall surface of the apparatus frame.

  In the present invention, the element mounting portion is preferably a recess formed between the pair of protrusions by the pair of protrusions. If comprised in this way, a pair of protrusion will be adjacent to an element mounting part, and will be formed in the innermost side. For this reason, the element holder gripping tool is minimal even when it is positioned inside the outer peripheral end of the fixed plate part with the pair of protrusions gripped from both sides, or even when protruding beyond the outer peripheral end of the fixed plate part. It only protrudes. Therefore, the space for the element holder holding tool that holds the element holder to enter can be minimized.

  The present invention is effective when applied when the optical element is a light receiving element or a light emitting element. In an optical head device, the light receiving element or the light emitting element is often positioned on the apparatus frame in a state where it floats from the wall surface of the apparatus frame in order to adjust the position in the optical axis direction. If the present invention is applied when mounting the device on the apparatus frame, positioning can be performed by a method in which an element holder on which an optical element is mounted is gripped by an element holder gripping tool even when there is no space.

  In the present invention, the fixed plate portion is bonded and fixed to the wall surface, for example, such that the front surface is orthogonal to the device optical axis.

  In the present invention, it is preferable that the protrusions face each other in a direction perpendicular to the height direction of the device frame. With this configuration, when the optical element is mounted on the apparatus frame, even if the flexible substrate already placed on the upper surface or the lower surface of the apparatus frame is positioned above or below the position where the optical element is mounted, A space for the element holder gripping tool that grips the holder to enter can be secured.

  In the present invention, it is preferable that the fixed plate portion has a substantially rectangular planar shape as a whole and is bonded and fixed so that a short side extends in a height direction of the device frame. With this configuration, the element holder does not protrude above or below the device frame even when the device frame is thinned.

  In the present invention, in the vicinity of at least one long side of the two long sides facing each other in the fixed plate portion, and in the vicinity of at least one short side of the two short sides facing each other in the fixed plate portion, It is effective when applied when a part of the apparatus frame or a flexible substrate is located.

  In the present invention, it is preferable that a concave portion coated with an adhesive is formed on the outer peripheral edge of the fixed plate portion.

  In the present invention, it is preferable that an adhesive application hole in which an adhesive is applied on the inner side is formed in the fixing plate portion at a position on the outer peripheral side from the protrusion.

  In the present invention, it is preferable that the adhesive application hole has a chamfered edge on the front side of the fixed plate portion. If comprised in this way, since the adhesive agent apply | coated in the adhesive agent application hole will adhere | attach an apparatus frame and an element holder between the chamfered edge and an apparatus frame, it can raise adhesive strength.

  In the present invention, it is preferable that the adhesive application hole has a chamfered edge on the back side of the fixed plate portion. If comprised in this way, when apply | coating an adhesive agent in the adhesive application hole from the nozzle which approached behind the element holder, since the edge of an adhesive application hole is chamfered, an adhesive agent will be easily in an adhesive application hole. Can be supplied.

  In the present invention, since the pair of protrusions of the element holder protrudes rearward at an inner position spaced a predetermined distance from the outer peripheral end of the fixed plate portion, the element holder gripping tool is more than the outer peripheral end of the fixed plate portion. It does not protrude greatly to the outside. Therefore, when the device frame is reduced in size and thickness as the optical head device is reduced in size and thickness, a part of the device frame or a flexible substrate is located near the place where the element holder is mounted. Even when the element holder is held, the element holder holding tool holding the element holder can enter. Therefore, the optical element can be positioned in a state where the element holder on which the optical element is mounted is gripped by the element holder gripping tool, so that the element holder is lifted from the wall surface of the apparatus frame, for example, the light of the optical element. The position and inclination in the axial direction can be adjusted, and in this state, the element holder can be bonded and fixed to the wall surface of the apparatus frame.

  An optical head device to which the present invention is applied will be described below with reference to the drawings. The embodiment described below is an example in which the present invention is applied to mounting a signal detection light receiving element on a device frame among a plurality of components mounted on the device frame.

[overall structure]
FIG. 1 is a plan view of an optical head device to which the present invention is applied. 2 and 3 are a plan view and a bottom view, respectively, showing a state in which a metal cover and a flexible substrate extending from the driving IC toward the objective lens driving device side are removed from the optical head device shown in FIG.

  The optical head device 1 of this embodiment shown in FIGS. 1 to 3 reproduces and / or records information on an optical recording medium such as a CD and a DVD. The optical head device 1 has a metal device frame 2 made of a die-cast product such as magnesium, and a guide shaft and a feed screw shaft 11 of a disk drive device are engaged with each of both ends of the device frame 2. A first bearing portion 21 and a second bearing portion 22 are formed. One side surface of the device frame 2 is curved in an arc shape to prevent interference when approaching a spindle motor (not shown) of the disk drive mechanism.

  On the upper surface side of the apparatus frame 2, the objective lens 91 is positioned substantially in the center, and the thin metal cover 8 is covered on the side of the objective lens 91 where the first bearing portion 21 is positioned. The metal cover 8 is engaged with an upper plate portion 81 that covers the upper surface of the device frame 2 and a protrusion 28 that is bent downward from one side edge of the upper plate portion 81 and formed on the side surface of the device frame 2. The positioning projection 29 protruding upward from the device frame 2 is fitted into the small hole 83 formed in the upper surface portion.

  The optical head device 1 of the present embodiment uses a first laser beam (infrared light) with a wavelength of 650 nm band and a second laser beam (outer infrared light) with a wavelength of 780 nm band to use a DVD disk and a CD. This is a two-wavelength optical head device capable of recording and reproducing information with respect to a system disk. Therefore, a twin laser light source 30 integrally provided with an AlGaInP laser diode that emits the first laser beam and an AlGaAs laser diode that emits the second laser beam is provided on the apparatus frame 2. The light source device 3 is mounted. Here, the twin laser light source 30 is mounted on a light source holder 35, and the light source holder 35 is in contact with the vertical wall 209 of the apparatus frame 2.

  The first laser beam and the second laser beam emitted from the light source device 3 having such a configuration are transmitted through a common optical system including a plurality of optical elements arranged in an optical path from the light source device 3 toward the optical recording disk. Then, the optical element is guided to a DVD-type disc or a CD-type disc, which is an optical recording disc, and an optical element constituting this optical system is also mounted on the apparatus frame 2. Return light from the optical recording disk is also guided to a common signal detection light receiving element 40 through a common optical system, and an optical element for defining an optical path for the return light and the signal detection light receiving element 40 are also provided. It is mounted on the frame 2.

  In the optical head device 1 of this embodiment, the common optical system includes a diffraction element 51 that diffracts the first and second laser beams emitted from the light source device 3 into three beams for tracking detection, and a diffraction element 51. A polarization beam splitter 52 that partially transmits the laser beam separated into three beams, a collimator lens 54 that converts the laser beam emitted from the polarization beam splitter 52 into parallel light, and a rising beam that launches the parallel light toward the optical recording disk. A raising mirror 55 and an objective lens 91 for converging the laser beam from the raising mirror 55 on the recording surface of the optical recording disk are included. Here, a wave plate 53 is disposed between the polarization beam splitter 52 and the collimating lens 54. The common optical system includes a first laser beam and a second laser beam that are reflected by the recording surface of the optical recording disk and then reflected by the polarization beam splitter 52 through the rising mirror 55, the collimating lens 54, and the wave plate 53. A sensor lens 56 for adding astigmatism to the return light is also included. A monitoring light receiving element 57 is disposed on the opposite side of the polarizing beam splitter 52 from the signal detecting light receiving element 40.

  The objective lens 91 is configured such that the position in the tracking direction and the focusing direction is servo-controlled by the objective lens driving mechanism 9, and such an objective lens driving mechanism 9 is also mounted on the apparatus frame 2. In this embodiment, a wire suspension type is used as the objective lens driving mechanism 9, and a known one can be used as the objective lens driving mechanism 9. A lens holder that is held, a holder support portion 93 that supports the lens holder so as to be movable in a tracking direction and a focusing direction by a plurality of wires, and a yoke fixed to the apparatus frame 2 are provided. The objective lens drive mechanism 9 includes a magnetic drive circuit including a drive coil attached to the lens holder and a drive magnet attached to the yoke. By controlling energization of the drive coil, the lens holder Is driven in the tracking direction and the focusing direction with respect to the optical recording disk. Note that the objective lens driving mechanism 9 can also perform tilt control for adjusting the tilt of the objective lens 91 in the jitter direction. The objective lens 91 is surrounded by a rectangular frame-shaped lens cover 90.

  In the optical head device 1 configured as described above, the first and second laser beams emitted from the light source device 3 are transmitted through the diffraction element 51 and then partially transmitted through the partial reflection surface of the polarization beam splitter 52. Thereafter, the polarization direction is rotated by ¼λ on the wave plate 53, and then the collimating lens 54 is headed. The laser light converted into parallel light by the collimator lens 54 is bent 90 degrees by the rising mirror 55 and travels toward the objective lens 91. At this time, part of the first and second laser beams emitted from the twin laser light source 30 is reflected by the partial reflection surface of the polarization beam splitter 52 and guided to the monitor light receiving element 57. As will be described later, the monitoring result of the monitoring light receiving element 57 is fed back to the twin laser light source 30 via the driving IC 6 mounted on the flexible substrate 71 and is emitted from the twin laser light source 30. The intensity of the is controlled.

  On the other hand, return light from the optical recording disk returns to the objective lens 91 and the rising mirror 55 in reverse, and is emitted toward the sensor lens 56 via the collimating lens 54, the wave plate 53, and the polarization beam splitter 52. After astigmatism is given by the lens 56, the light enters the signal detecting light receiving element 40 and is detected by the signal detecting light receiving element 40. The return light detected by the signal detecting light receiving element 40 includes three beams obtained by diffracting the first and second laser beams by the diffraction element 51. For example, of the three beams, the 0th order light The signal is reproduced by the main beam consisting of the above, and the tracking error signal and tracking error signal of the objective lens 91 are detected using the detection result of the sub beam consisting of ± first-order diffracted light. Based on the tracking error signal thus detected and the detection result of the tracking error signal, the driving IC 6 controls the objective lens driving mechanism 9.

  As described above, in the optical head device 1 according to the present embodiment, recording and reproduction are performed by the common objective lens 91 using the first laser light and the second laser light, and therefore the objective lens 91 has concentric grooves and steps. A two-wavelength lens in which a diffraction grating is formed is used. For this reason, according to the present embodiment, even if the objective lens 91 is shared, an optical recording disk having a recording layer with a different thickness of the surface protective layer for both the first laser beam and the second laser beam. Can respond.

  In the optical head device 1 of this embodiment, in order to supply power and signals to the driving IC 6, the light source device 3, the signal detection light receiving element 40 and the monitor light receiving element 57, a plurality of substrates whose substrates are made of polyimide or the like can be used. A flexible substrate is used. Of these flexible substrates, a driving IC 6 for driving and controlling the twin laser light source 30 is mounted on the lower surface of the largest main flexible substrate 71. Further, the end 711 of the main flexible substrate 71 is connected to the monitor light receiving element 57 side. Of the three sub-flexible substrates having a small size, the sub-flexible substrate 72 is disposed so as to overlap the upper surface of the flexible substrate 71, and one end thereof is the main flexible substrate 71. The other end is connected to the light source device 3 side. The other sub-flexible substrate 74 is disposed so that one end thereof is overlapped on the upper surface of the end portion 712 of the flexible substrate 71, and the other end is bent in the middle, so that the holder support portion 93 of the objective lens driving mechanism 9 is bent. It is connected to a wiring board 94 disposed behind. Here, the sub flexible substrate 74 includes a wide portion 741 on the way from one end to the other end (portion to the circuit board of the objective lens driving mechanism 9). The holder support portion 93 of the lens driving mechanism 9 covers the gel pot 96 formed at the root portion of the suspension wire and functions as a cover for the gel pot 96. Further, another sub flexible substrate 75 (not shown in FIGS. 1 to 3), which will be described later with reference to FIGS. 4A and 4B, is placed on the lower surface of the flexible substrate 71. One end is connected to the main flexible substrate 71, while the other end is bent halfway and connected to the signal detection light receiving element 40 side.

  When mounting the flexible substrate configured as described above on the apparatus frame 2, a glass-epoxy substrate or a metal is provided on the end 712 located on the side of the objective lens driving mechanism 9 in the main flexible substrate 71. A substantially triangular reinforcing plate 75 made of a plate or the like is bonded and fixed. Here, while holes are formed in the reinforcing plate 75, screw holes are formed in the device frame 2 at positions where the flexible substrate 71 overlaps the holes of the reinforcing plate 75. Therefore, when the main flexible board 71 is placed on the apparatus frame 2 so as to overlap, the end 712 of the flexible board 71 is attached to the apparatus frame 2 using the holes of the reinforcing plate 75 and the screw holes of the apparatus frame 2. It fixes with the metal screw 76 with respect to it. In addition, a fixing portion 714 that is fixed to the apparatus frame 2 with two metal screws 77 is formed at the end 713 opposite to the side on which the reinforcing plate 75 is provided in the main flexible substrate 71. Has been. Here, only the flexible substrate 71 exists in the fixing portion 714, and the reinforcing plate is not bonded and fixed. Accordingly, the ground pattern formed on the flexible substrate 71 is electrically connected to the device frame 2 at the end 713, and the fixed portion 714 functions as a contact for ground. When the end portions 712 and 712 are fixed to the device frame 2 with the screws 76 and 77, the flexible substrate 71 having such a configuration is fixed to the device frame 2 in a flat state and does not cover the metal cover 8. Even this flat state can be maintained. For this reason, since the shape restoring force of the flexible substrate 71 is not applied to the metal cover 8, the shape restoring force of the flexible substrate 71 does not act on the device frame 2 via the metal cover 8. Therefore, the apparatus frame 2 is not deformed, and it is possible to prevent the occurrence of optical axis deviation due to the positional deviation of the optical element.

[Mounting structure and positioning method of light receiving element for signal detection]
4A and 4B are an explanatory diagram when the mounting structure of the light receiving element for signal detection with respect to the apparatus frame in the optical head device shown in FIG. 1 is viewed from obliquely rearward and an explanatory diagram when viewed from obliquely forward. is there. FIG. 5 is an explanatory diagram of a light receiving element holder used in the optical head device shown in FIG. 6 (a) and 6 (b) are explanatory views showing the state of the positioning process when the signal detection light receiving element is mounted on the apparatus frame in the optical head device shown in FIG. In FIG. 6, the optical axis direction is the z-axis, the two axes orthogonal to the z-axis are the x-axis and the y-axis, respectively, and the axes around the x-axis, the y-axis, and the z-axis are respectively Let θx, θy, and θz.

  As shown in FIGS. 4A and 4B, in the optical head device 1 of the present embodiment, the signal detecting light receiving element 40 has a substantially rectangular flat plate shape, and is made of a resin or metal light receiving element holder 45 ( It is fixed to the side wall 25 (wall surface) of the apparatus frame 2 via the element holder according to the present invention. Here, on the side surface of the apparatus frame 2, the portions 26 and 27 of the apparatus frame 2 protrude on both sides of the region where the signal detection light receiving element 40 is to be mounted, and the main flexible substrate is located above the portions 26 and 27. The drawer portion 71 is located, and there is no room for space.

  Therefore, in this embodiment, the light receiving element holder 45 having the structure shown in FIGS. 4A, 4B and 5 is used, and the light receiving element holder 45 is arranged so that the front surface is orthogonal to the apparatus optical axis. A fixing plate portion 451 bonded and fixed to the side wall surface 25 of the frame 2, an element mounting portion 455 for mounting the signal detecting light receiving element 40 on the back side of the fixing plate portion 451, and the element mounting portion 455 are sandwiched therebetween. A pair of protrusions 456 and 457 projecting rearward from the fixed plate portion 451 at the inner positions spaced from the left and right outer peripheral ends of the fixed plate portion 451 in the both side regions. Here, each of the protrusions 456 and 457 has a shape that is bent in a circular arc shape, and has an outer end portion that is linearly cut out.

  The fixed plate portion 451 has a substantially rectangular planar shape as a whole, and is bonded and fixed so that the short side extends in the height direction of the device frame 2. Accordingly, the pair of protrusions 456 and 457 are opposed to each other in a direction orthogonal to the height direction of the device frame 2. A through hole 452 through which return light passes from the sensor lens 56 toward the light receiving element 40 for signal detection is formed in the center of the fixed plate portion 451. Further, the outer peripheral edge of the fixed plate portion 451 is formed with a recess 458 in which four corner portions are cut out and a temporary fixing adhesive is applied inside.

  The element mounting portion 455 is a recess formed between the pair of protrusions 456 and 457. Inside the recess, the signal detection light-receiving element 40 has a wiring board 41 of substantially the same size bonded to the back side. In the state, it is bonded and fixed to the element mounting portion 455. Further, the end portion of the sub flexible substrate 75 connected to the signal detection light receiving element 40 is folded a plurality of times behind the wiring substrate 41 with the reinforcing plate 78 interposed therebetween. The folded portions of the reinforcing plate 78 and the flexible substrate 75 are larger in size than the signal detecting light receiving element 40 and the wiring board 41 and are completely covered with the protrusions 456 and 457 of the light receiving element holder 45.

  In order to mount the signal detecting light receiving element 40 on the apparatus frame 2 through the light receiving element holder 45 configured as described above, first, as shown in FIGS. 6A and 6B, the back surface of the light receiving element holder 45 is provided. On the side, the signal detecting light receiving element 40 is bonded and fixed to an element mounting portion 455 formed between the pair of protrusions 456 and 457. Here, in FIG. 6A, the sub-flexible substrate 75 and the reinforcing plate 78 are not shown, but the signal detection light-receiving element 40 is configured as shown in FIG. 6B. The flexible substrate 75 and the reinforcing plate 78 are mounted on the light receiving element holder 45.

  Next, the projections 456 and 457 of the light receiving element holder 45 are gripped by the element holder grippers 47 and 48 from both sides, while the twin laser light source 30 previously mounted on the apparatus frame 2 is turned on to return light from the pseudo disk or the like. While monitoring the light reception results of the signal detecting light receiving element 40, the element holder grips 47 and 48 allow the light receiving element holder 45 to be in the XY direction (in-plane position), Z direction (position in the optical axis direction), θz. (Angle position around the optical axis), θx, θy (tilt) are adjusted, and the signal detecting light receiving element 40 is positioned with respect to the apparatus frame 2. Here, the element holder gripping tools 47 and 48 include holder contact portions 471 and 481 whose tip portions are bent in an L shape, and do not interfere with the sub flexible substrate 75 and the reinforcing plate 78. Yes. Further, the element holder grips 47 and 48 have shapes and dimensions that do not interfere with the apparatus frame 2.

  After positioning the light receiving element 40 for signal detection by such a method, as shown in FIG. 6B, the concave portion 458 of the fixed plate portion 451 is interposed between the device frame 2 and the element holder grips 47 and 48. The nozzle 49 is inserted toward the surface, and an adhesive for temporary fixing is applied and solidified so as to straddle the concave portion 458 and the side wall surface 25 of the apparatus frame 2. As a result, the light receiving element holder 45 is temporarily fixed to the apparatus frame 2.

  After that, the element holder gripping tools 47 and 48 are retracted, and a main fixing adhesive is applied to the gap between the side wall surface 25 of the apparatus frame 2 and the front end surface of the fixing plate portion 451 of the light receiving element holder 45 to receive light. The element holder 45 is fixed to the apparatus frame 2.

(Main effects of this form)
As described above, in this embodiment, the pair of protrusions 456 and 457 of the light receiving element holder 45 protrude rearward at an inner position at a predetermined distance from the outer peripheral end of the fixed plate portion 451. The holder grippers 47 and 48 do not protrude beyond the outer peripheral end of the fixed plate portion 451 while holding the light receiving element holder 45 with the protrusions 456 and 457 sandwiched from the outside. Accordingly, when the device frame 2 is reduced in size and thickness as the optical head device 1 is reduced in size and thickness, the portions 26 and 27 of the device frame 2 are disposed in the vicinity of the place where the light receiving element holder 45 is mounted. Even when the flexible substrate 71 is positioned, the element holder holding tools 47 and 48 that hold the light receiving element holder 45 can enter. Therefore, since the light receiving element holder 45 on which the signal detecting light receiving element 40 is mounted can be positioned in a state where the light receiving element holder 45 is held by the element holder holding tools 47 and 48, the light receiving element holder 45 is attached to the device. Positioning so that it floats from the side wall surface 25 of the frame 2, for example, adjustment of the position in the Z direction (position in the optical axis direction) and the angular position (tilt) in the θx and θy directions of the light receiving element 40 for signal detection In this state, the light receiving element holder 45 can be bonded and fixed to the side wall surface 25 of the apparatus frame 2.

[Other embodiments]
In the present invention, the light receiving element holder 45 corresponds to the shape of the light receiving element for signal detection 40 and the element holder grips 47 and 48 as shown in FIG. As shown in FIG. 7B, the light receiving element holder 45 having a structure in which the shapes of the protrusions 456 and 457 are changed, the light receiving element holder 45 in which the concave portion 458 is not formed on the outer peripheral edge of the fixing plate portion 451, As shown in c), instead of forming the recess 458 on the outer peripheral edge of the fixed plate portion 451, an adhesive application hole 459 consisting of a through hole in which an adhesive is applied on the inner side is provided on the outer peripheral side of the protrusions 456 and 457. Alternatively, the light receiving element holder 45 formed with the above may be used.

  Further, in the light receiving element holder 45 shown in FIG. 7C, it is preferable that the adhesive-side application hole 459 has a chamfered edge on the back side of the fixed plate portion 451 as shown in FIG. 8A. With this configuration, when the adhesive is applied into the adhesive application hole 459 from the nozzle that has entered behind the light receiving element holder 45, the adhesive is applied to the adhesive because the edge of the adhesive application hole 459 is chamfered. It can be easily supplied into the application hole 459.

  In the light receiving element holder 45 shown in FIG. 7C, it is preferable that the edge on the front surface side of the fixed plate portion 451 is chamfered in the adhesive application hole 459 as shown in FIG. 8B. With this configuration, the adhesive applied in the adhesive application hole 459 adheres the device frame 2 and the light receiving element holder 45 between the chamfered edge and the device frame 2, thereby increasing the adhesive strength. Can do.

  In the above embodiment, the present invention is applied to mount the signal detecting light receiving element 40 on the apparatus frame 2. However, the present invention may be applied to mount the twin laser light source 30 on the apparatus frame 2. That is, it is effective when applied to a light receiving element or a light emitting element. In the optical head device, the twin laser light source 30 is also positioned on the device frame 2 in a state where the light source element holder is floated from the wall surface of the device frame 2 when the position in the optical axis direction is adjusted. If the present invention is applied when the laser light source 30 is mounted on the apparatus frame 2, even if there is not enough space, positioning is performed by a method in which the light emitting element holder on which the twin laser light source 30 is mounted is held by an element holder holding tool. It can be carried out.

It is a top view of the optical head device to which the present invention is applied. FIG. 2 is a plan view of a state where a flexible substrate extending from the optical head device shown in FIG. 1 toward the objective lens driving device side from the metal cover and driving IC is removed. FIG. 2 is a bottom view of a state in which a metal cover and a flexible substrate extending from a driving IC toward the objective lens driving device side are removed from the optical head device shown in FIG. 1. (A), (b) is explanatory drawing when the mounting structure of the light receiving element for a signal detection with respect to the apparatus frame in the optical head apparatus shown in FIG. 1 is seen from diagonally back, and explanatory drawing when it sees from diagonally forward. It is explanatory drawing of the light receiving element holder used for the optical head apparatus shown in FIG. (A), (b) is explanatory drawing which shows the mode of the positioning process when mounting the light-receiving element for a signal detection with respect to an apparatus frame in the optical head apparatus shown in FIG. is there. (A), (b), (c) is a perspective view which concerns on the modification of the light receiving element holder which can be used by this invention. It is explanatory drawing of the adhesive agent application hole of the light receiving element holder shown in FIG.7 (c). It is explanatory drawing of the conventional element holder.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Optical head apparatus 2 Apparatus frame 3 Light source apparatus 9 Objective lens drive mechanism 25 Side wall surface 30 of apparatus frame Twin laser light source (light emitting element)
40 Light receiving element for signal detection (light receiving element)
45 Light receiving element holder (element holder)
47, 48 Element holder grip 451 Light receiving element holder fixing plate 455 Light receiving element holder element mounting portion 456, 457 Light receiving element holder protrusion

Claims (12)

In an optical head apparatus in which a plurality of parts for reproducing or / and recording information on an optical recording medium are mounted on an apparatus frame,
The plurality of parts includes an optical element mounted on the device frame via an element holder,
The element holder includes a fixing plate portion that is bonded and fixed to the wall surface with the front surface facing the wall surface of the device frame, an element mounting portion that mounts the optical element on the back side of the fixing plate portion, and the element mounting portion. And a pair of protrusions protruding rearward from the fixed plate portion at an inner position at a predetermined distance from the outer peripheral end of the fixed plate portion in both side regions sandwiched between the two. Head device.   2. The optical head device according to claim 1, wherein the element mounting portion is a recess formed between the pair of protrusions.   3. The optical head device according to claim 1, wherein the optical element is a light receiving element or a light emitting element.   4. The optical head device according to claim 1, wherein the fixing plate portion is bonded and fixed to the wall surface so that the front surface thereof is orthogonal to the optical axis of the device.   5. The optical head device according to claim 1, wherein the protrusions face each other in a direction orthogonal to a height direction of the device frame.   6. The optical head device according to claim 5, wherein the fixed plate portion has a substantially rectangular planar shape as a whole, and is bonded and fixed so that a short side extends in a height direction of the device frame.   In Claim 6, in the vicinity of at least one long side of two long sides opposite to each other in the fixed plate portion, and in the vicinity of at least one short side of two short sides opposite to each other in the fixed plate portion, respectively. An optical head device in which a part of the device frame or a flexible substrate is located.   8. The optical head device according to claim 1, wherein a concave portion coated with an adhesive is formed on an outer peripheral edge of the fixed plate portion.   9. The optical head device according to claim 1, wherein an adhesive application hole in which an adhesive is applied inside is formed in the fixed plate portion at a position on an outer peripheral side of the protrusion. .   10. The optical head device according to claim 9, wherein the adhesive application hole has a chamfered edge on the front side of the fixed plate portion.   11. The optical head device according to claim 9, wherein the adhesive application hole has a chamfered edge on the back side of the fixed plate portion. In the manufacturing method of the optical head device specified in any one of Claims 1 thru / or 11,
In fixing the element holder on which the optical element is mounted to the device frame,
The projection of the element holder is gripped from both sides with an element holder gripper to position the optical element with respect to the apparatus frame, and in this state, an adhesive is applied so as to straddle the fixing plate portion and the apparatus frame. A method of manufacturing an optical head device comprising applying the coating method.

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