JP2010033625A - Optical head device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical head device whose workability when an optical element holder is mounted on a base is improved compared to the conventional art. <P>SOLUTION: The optical head device includes the optical element holder 70 where a diffractive element 33 is mounted, a guide member 80 having a circular arc wall 81 which is engaged with the optical element holder 70 so as to be rotatable around an optical axis of the diffractive element 33 with respect to the optical element holder 70, and a leaf spring 90 which urges the optical element holder 70 and the guide member 80 to a device frame side so as to maintain the position of the optical element holder 70 and the guide member 80 with respect to the device frame, wherein the optical element holder 70, guide member 80 and the leaf spring 90 become a unit 100 by a locking hole 92a of the leaf spring 90 before being mounted on the device frame. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an optical head device used for reproducing or recording an optical recording disk such as a CD (Compact Disk) or a DVD (Digital Versatile Disk).

  As a conventional optical head device, a laser light-emitting element as a laser light source, a photodiode as a light-receiving element, a forward path for guiding laser light emitted from the laser light-emitting element to an optical recording disk, and reflected light from the optical recording disk There is known an optical pickup device having a diffraction grating as an optical element constituting at least a part of a return path leading to a diode, and a pickup base as a base on which a laser light emitting element, a photodiode and a diffraction grating are mounted (for example, , See Patent Document 1). A block base for mounting a plurality of optical elements is mounted on the pickup base.

  Further, the optical pickup device includes a holder as an optical element holder on which the diffraction grating is placed, and a leaf spring as a biasing member that biases the holder toward the block base so that the position of the holder with respect to the block base can be held. Have. The holder has an arcuate sliding end surface that comes into contact with the block base.

Then, the diffraction grating is rotated while the holder is in contact with the block base at the arc-shaped sliding end surface, thereby adjusting the angle of the rotation direction around the optical axis with respect to the block base.
JP 2005-285166 A

  However, in the above-described optical pickup device disclosed in Patent Document 1, a plate spring is attached to bias the holder toward the block base while maintaining the holder to which the diffraction grating is attached in contact with the block base. Must. Therefore, there is a problem that the positional relationship between the holder and the leaf spring or the posture of the holder becomes unstable. In addition, there is a problem in that workability is poor because the worker is forced to perform installation work in a small space.

  The present invention has been made to solve the conventional problems, and stabilizes the positional relationship between the holder and the leaf spring or the attitude of the holder, and improves the workability when the optical element holder is mounted on the base. An object of the present invention is to provide an optical head device that can be improved.

  The optical head device of the present invention includes at least a laser light source, a light receiving element, an outward path for guiding laser light emitted from the laser light source to an optical recording disk, and a return path for guiding reflected light from the optical recording disk to the light receiving element. In an optical head device having an optical element constituting a part, and a base on which the laser light source, the light receiving element, and the optical element are mounted, an optical element holder on which the optical element is placed, and the base with respect to the base An urging member that urges the optical element holder toward the base side so that the position of the optical element holder can be held, and the urging member includes the optical element holder and the urging member mounted on the base. A biasing portion that biases the optical element holder toward the base side by a restoring force of elastic deformation, and the optical element holder and the biasing member are And having a locking portion for the single piece of the optical element holder and the biasing member against the return force before being mounted to the over scan.

  The optical head device of the present invention includes a laser light source, a light receiving element, an outward path for guiding laser light emitted from the laser light source to an optical recording disk, and a return path for guiding reflected light from the optical recording disk to the light receiving element. An optical element having at least a part of the optical element and a base on which the laser light source, the light receiving element, and the optical element are mounted, and an optical element holder on which the optical element is mounted; A guide member that holds the optical element holder in a state where the optical element is adjusted with respect to the optical axis, and a biasing member that biases the guide member toward the base side along the optical axis. Before placing the optical element holder, the guide member, and the biasing member on the base, the position of the guide member relative to the base is maintained by arranging Characterized in that it comprises a locking member for locking the serial to the optical element holder and the guide member and the biasing member from one another.

  With this configuration, the optical head device of the present invention is provided with a locking portion that integrates the optical element holder and the biasing member against the restoring force before the optical element holder and the biasing member are mounted on the base. The force member has. The optical element holder and the urging member are provided with a locking member for integrating them. Therefore, since the optical element holder and the biasing member are integrated before the optical element holder is mounted on the base, the workability when the optical element holder is mounted on the base can be improved as compared with the prior art. Further, the optical head device of the present invention confirms in advance the biasing state of the biasing portion with respect to the optical element holder by integrating the optical element holder and the biasing member before the optical element holder is mounted on the base. can do. On the other hand, in the configuration in which the biasing member in the compressed state is mounted between the base and the optical element holder after the optical element holder is brought into contact with the base, the biasing state of the biasing portion with respect to the optical element holder is clearly visible Therefore, even if a residual stress in a direction different from the urging direction is generated in the urging portion of the urging member, the urging portion of the urging portion with respect to the optical element holder is left without being adjusted. There was a case. According to the present invention, by confirming the biasing state of the biasing portion with respect to the optical element holder in advance, the biasing member in the compressed state is brought into contact between the base and the optical element holder after the optical element holder is brought into contact with the base. The residual stress in a direction different from the urging direction generated in the urging portion of the urging member can be suppressed as compared with the configuration mounted in between, and the urging force can be obtained efficiently. In the configuration in which the biasing member in the compressed state is mounted between the base and the optical element holder after the optical element holder is brought into contact with the base, the mounting direction is limited. When determining the shape, the degree of freedom becomes small. The optical head device of the present invention has a biasing force on the optical element holder as compared with the configuration in which the biasing member in a compressed state is mounted between the base and the optical element holder after the optical element holder is brought into contact with the base. Since the freedom degree of the mounting direction of a member can be improved, the freedom degree of the shape of a biasing part can be improved.

  The optical head device of the present invention includes a guide member having a holder engaging portion that engages with the optical element holder so as to be rotatable about the optical axis of the optical element, and the urging member includes the guide member with respect to the base. The optical element holder and the guide member are urged toward the base so that the positions of the optical element holder and the guide member can be held, and the guide member can slide on the base in a direction perpendicular to the optical axis. A base engaging portion that engages with the base, and the biasing portion is caused by a restoring force of elastic deformation when the optical element holder, the guide member, and the biasing member are mounted on the base. The optical element holder and the guide member are urged toward the base, and the locking portion is mounted on the base by the optical element holder, the guide member and the urging member. By engaging the guide member against the return force before, and characterized in that said optical element holder, the guide member and the biasing member in one piece.

  With this configuration, the optical head device of the present invention can be rotated about the optical axis of the optical element with respect to the optical element holder by the guide member. The optical head device of the present invention can be slidable on the base in a direction perpendicular to the optical axis of the optical element.

  In addition, it is preferable that the locking portion of the optical head device of the present invention is released when the integrated product is mounted on the base.

  Further, the base of the optical head device of the present invention has a pair of wall portions formed in the urging direction of the urging portion, and the pair of wall portions has the urging direction gap as the urging force. Preferably, the integrated product is formed to be smaller than the width of the integrated product in the direction, and the integrated product is mounted on the base by being inserted into the gap.

  Moreover, it is preferable that the said latching | locking part of the optical head apparatus of this invention is comprised so that latching is possible from the urging | biasing direction of the said urging | biasing part.

  With this configuration, the optical head device of the present invention incorporates the urging member into an integrated product as compared with the case where the locking portion is configured to lock from a direction other than the urging direction of the urging portion. Since it is possible to suppress the occurrence of deformation in the direction other than the urging direction at the urging portion of the urging member, a residual stress in a direction different from the urging direction is generated at the urging portion of the urging member. This can be suppressed, and the urging force can be obtained efficiently. The optical head device according to the present invention differs from the case where the locking portion is configured to be locked from a direction other than the biasing direction of the biasing portion, and the biasing portion generates a biasing force while biasing. Since the biasing part generates a biasing force, the biasing part has a shape that allows the biasing member to be smoothly integrated into the integrated product even if it is shifted in a direction other than the biasing direction while generating a biasing force. The degree of freedom of the shape of the biasing portion can be improved compared to the case where the locking portion is configured to be locked from a direction other than the biasing direction of the biasing portion. It is possible to make the shape of the urging portion highly springable.

  Further, the biasing portion of the optical head device of the present invention includes a plane that passes through the optical axis of the optical element perpendicular to the direction in which the integrated product is moved when the integrated product is mounted on the base, and the optical axis. It is preferable that the plane is symmetrical with respect to a plane orthogonal to the plane.

  With this configuration, the optical head device of the present invention can urge the optical element holder in a balanced manner by the urging unit, and therefore, adjustment work can be performed smoothly.

  The biasing member of the optical head device according to the present invention includes the biasing member when the latching portion is latched and the optical element holder and the biasing member are integrated. It is preferable to have a restricting portion that restricts movement in the urging direction from the position urged by. If comprised in this way, the urging | biasing part can prevent moving too much in the urging | biasing direction from the position urged | biased by the control part. Therefore, it is possible to prevent the urging portion from being deformed excessively and losing the elastic force.

  In the optical head device of the present invention, since the optical element holder and the urging member are integrated before the optical element holder is mounted on the base, the workability when the optical element holder is mounted on the base is improved as compared with the prior art. can do. Further, the optical head device of the present invention confirms in advance the biasing state of the biasing portion with respect to the optical element holder by integrating the optical element holder and the biasing member before the optical element holder is mounted on the base. can do. According to the present invention, after the optical element holder is brought into contact with the base, the compressed biasing member is generated in the biasing portion of the biasing member as compared with the configuration in which the biasing member is mounted between the base and the optical element holder. Residual stress in a direction different from the biasing direction can be suppressed, and the biasing force can be obtained efficiently. The optical head device of the present invention has a biasing force on the optical element holder as compared with the configuration in which the biasing member in a compressed state is mounted between the base and the optical element holder after the optical element holder is brought into contact with the base. Since the freedom degree of the mounting direction of a member can be improved, the freedom degree of the shape of a biasing part can be improved.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  First, the configuration of the optical head device according to the present embodiment will be described.

  FIG. 1 is a perspective view of an optical head device 10 according to the present embodiment. FIG. 2 is an exploded perspective view of the optical head device 10. FIG. 3 is a perspective view of the optical head device 10 with some components removed. FIG. 4 is a bottom view of the optical head device 10.

  The optical head apparatus 10 shown in FIG. 1 reproduces information on an optical recording disk (not shown) such as a CD disk or a DVD disk by using a laser beam having a wavelength of 650 nm and a laser beam having a wavelength of 780 nm. And a two-wavelength optical head device capable of recording.

  As shown in FIGS. 1 to 4, the optical head device 10 is disposed on the optical recording disk side with respect to a device frame 11 (base) made of metal made of die-cast products such as magnesium and zinc, and the device frame 11. A laser light source device 21 as a laser light source including a metal cover 12 and a metal cover 13 covering various components on the device frame 11, an AlGaInP-based semiconductor laser emitting a laser beam having a wavelength of 650 nm, and a wavelength of 780 nm A laser light source device 22 as a laser light source including an AlGaAs semiconductor laser that emits a band laser beam, and a monitor light receiving element 23 for receiving the laser light emitted by the laser light source device 21 and the laser light source device 22. And a signal as a light receiving element for receiving the laser beam reflected by the recording surface of the optical recording disk. A light receiving element 24 for detection, an optical system 30 including an objective lens 31 for converging laser light emitted by the laser light source device 21 and the laser light source device 22 on the recording surface of the optical recording disk, and an objective mounted on the device frame 11. The objective lens drive mechanism 40 for servo-controlling the position of the lens 31, the laser light source device 21, the laser light source device 22, the monitor light receiving element 23, the signal detecting light receiving element 24, the objective lens drive mechanism 40, etc. The connected flexible circuit board 50 and a dustproof seal 60 that is attached to the back surface of the apparatus frame 11 and prevents dust from entering the optical head apparatus 10 are provided.

  The apparatus frame 11 includes a bearing 11a and a bearing 11b that engage with a guide shaft and a feed screw shaft (not shown) for driving an optical recording disk, a positioning projection 11c for the metal cover 12, and a metal cover 12. And a claw 11d for fastening the head.

  The metal cover 12 includes a hole 12 a that fits into the protrusion 11 c of the device frame 11 and a groove 12 b that engages with the claw 11 d of the device frame 11.

  The metal cover 13 has a hole 13 a through which the laser light emitted from the objective lens 31 passes and covers the objective lens driving mechanism 40.

  The laser light source device 21, the laser light source device 22, and the monitor light receiving element 23 are mounted on the device frame 11 and covered with a metal cover 12.

  The optical system 30 transmits the laser light emitted from the laser light source device 21 and reflects the laser light emitted from the laser light source device 22, and an optical path combining polarizing prism 32, and between the laser light source device 21 and the polarizing prism 32. Diffractive element 33 in which a half-wave plate is integrally formed and a diffractive element 34 and relay in which a half-wave plate disposed between laser light source device 22 and polarizing prism 32 is integrally formed A lens 35, a half mirror 36 that is disposed between the monitor light-receiving element 23 and the polarizing prism 32 and partially reflects the laser light emitted from the polarizing prism 32, and is emitted from the polarizing prism 32 and reflected by the half mirror 36. A quarter-wave plate 37 for generating a quarter-wave phase difference in the laser beam, and a laser beam transmitted through the quarter-wave plate 37 as parallel light. A collimator lens 38, and a raising mirror 39 to launch toward the optical recording disk the laser light collimated by the collimator lens 38. In the present embodiment, the diffractive element 33 and the diffractive element 34 are formed integrally with a half-wave plate, but are not necessarily formed integrally.

  The polarizing prism 32, the diffractive element 33, the diffractive element 34, the relay lens 35, the half mirror 36, the quarter wavelength plate 37, the collimating lens 38, and the rising mirror 39 are mounted on the apparatus frame 11. The polarizing prism 32, the diffraction element 33, the diffraction element 34, the relay lens 35, the half mirror 36, and the quarter wavelength plate 37 are covered with the metal cover 12. The collimating lens 38 and the raising mirror 39 are covered with an objective lens driving mechanism 40.

  The flexible circuit board 50 is electrically connected to the end portion 50 a electrically connected to the laser light source device 21, the end portion 50 b electrically connected to the laser light source device 22, and the monitor light receiving element 23. The flexible circuit includes an end portion 50c, an end portion 50d electrically connected to the signal detecting light receiving element 24, and an end portion (not shown) electrically connected to the objective lens driving mechanism 40. The substrate 50 is partially bent and is three-dimensionally mounted on the apparatus frame 11 and covered with the metal cover 12.

  FIG. 5 is a bottom view of a part of the optical head device 10 and shows a state in which the dustproof seal 60 (see FIG. 4) is not attached. FIG. 6 is a perspective view of a part of the optical head device 10 in a state where the dustproof seal 60 is not applied. FIG. 7 is an exploded perspective view seen from the front side of the optical element holder 70 on which the diffraction element 33 as an optical element is mounted, the guide member 80 engaged with the optical element holder 70, and the leaf spring 90. FIG. 8 is an exploded perspective view of the optical element holder 70, the guide member 80, and the leaf spring 90 as seen from the back side.

  As shown in FIGS. 5 to 8, the optical head device 10 can be rotated about the optical axis of the diffraction element 33 with respect to the optical element holder 70 and a black optical element holder 70 on which the diffraction element 33 is mounted. A white guide member 80 having an arc wall 81 as a holder engaging portion that engages with the optical element holder 70, and an optical element holder capable of holding the positions of the optical element holder 70 and the guide member 80 with respect to the apparatus frame 11 as a base 70 and a guide member 80 having a unit 100 comprising a plate spring 90 as a biasing member that biases the guide member 80 in the direction of the optical axis of the diffraction element 33 indicated by the arrow 10a. The colors of the optical element holder 70 and the guide member 80 are not limited to the above.

  FIG. 9 is a bottom view of the device frame 11. FIG. 10 is a perspective view of a part of the device frame 11.

  As shown in FIGS. 5, 6, 9, and 10, the apparatus frame 11 has a recess 11 e that holds the optical element holder 70, the guide member 80, and the plate spring 90 by the urging force of the plate spring 90. . The recess 11e includes a recess wall 11f that forms an upper surface, a recess wall 11g that is disposed on the laser light source device 21 side and orthogonal to the recess wall 11f, and a recess that is disposed opposite to the recess wall 11g and orthogonal to the recess wall 11f. The wall 11h includes a recess wall 11g and a recess wall 11i that is disposed at both ends of the recess wall 11h and is orthogonal to the recess wall 11f. In the recess walls 11g and 11h, light passage holes 11j and 11k through which laser light passes are formed near the center, respectively. Further, the device frame 11 has a round hole 11n formed on the bottom surface at a position opposite to the light passage hole 11j with respect to the light passage hole 11k.

  FIG. 11 is a front view of the optical element holder 70. FIG. 12 is a perspective view of the optical element holder 70 viewed from the front side.

  As shown in FIGS. 5 to 8, 11, and 12, the optical element holder 70 includes a spring engagement wall 71 that engages (abuts) the leaf spring 90, and a spring engagement wall 71 on the opposite side. An element mounting base 73 provided on the wall 72 on which the diffraction element 33 is mounted, guide engaging portions 74 provided at the four corners of the wall 72 to engage with the guide member 80, and the optical element holder 70 include the device frame 11. And a notch 75, which will be described later, provided in a portion exposed to the outside when stored in the recess 11e, and a light passage hole 76 provided substantially at the center for allowing laser light to pass therethrough. The element mounting base 73 engages with the two arc-shaped arc walls 73a engaged with the two arc walls 81 of the guide member 80 and the diffraction element 33 to position the diffraction element 33 in the direction perpendicular to the optical axis. Two element positioning walls 73b that are orthogonal to each other, two dust-proof walls 73c that prevent the dust from being applied to the diffraction element 33, and an adhesive that fixes the diffraction element 33 to the element mounting base 73 include an element mounting base. 73 and two groove portions 73d for preventing the protrusion of the adhesive and improving the adhesive area of the adhesive.

  As shown in FIGS. 5 to 8, the guide member 80 slides on the apparatus frame 11 in a direction indicated by an arrow 10 b parallel to the recessed wall 11 f of the apparatus frame 11 in a direction orthogonal to the optical axis of the diffraction element 33. A frame engaging wall 82a, 82b as a base engaging portion that engages with the recessed walls 11f, 11h of the apparatus frame 11 and a guide engaging member of the optical element holder 70 provided on the opposite side of the frame engaging wall 82b. A laser beam can be passed through the holder engaging wall 83 that engages with the joining portion 74, the frame engaging wall 82b, and the holder engaging wall 83, and two arcuate arc walls 81 are provided. A through hole 84 formed with a circular arc notch 85 (described later) provided at the center of a portion exposed to the outside when the guide member 80 is accommodated in the recess 11e of the apparatus frame 11, When the door member 80 is housed in the recess 11e of the apparatus frame 11, the leaf spring 90 is engaged with the two notches 86 provided at both ends of the portion exposed to the outside and closed on the holder engaging wall 83 side. In order to prevent the leaf spring 90 from approaching too much, the latching claw 87 has a stopper 88 that abuts against a stopper 92b as a restricting portion formed on the leaf spring 90. The circular arc notch 85 is a portion for placing a fulcrum of a rotating jig that rotates the optical element holder 70 around the optical axis of the diffraction element 33 with respect to the guide member 80. The arc notch 85 is formed inside an imaginary circle formed by extending the arc wall 81 in the circumferential direction centering on the optical axis of the diffraction element 33. The locking claw 87 has an inclined surface 87a.

  The leaf spring 90 is inserted into the concave portion 11e of the apparatus frame 11 and elastically deformed, and by its return force, the two urging portions 91 that urge the optical element holder 70 toward the apparatus frame 11 side, and the outside of the urging portion 91 The two extending portions 92 extending to the same side as the urging portion 91 side and the leaf spring 90 provided in the portion exposed to the outside when being housed in the recessed portion 11e of the device frame 11 are operated during assembly. An operating portion 93 to be pushed by a person, and a ring-shaped frame portion 94 having an urging portion 91 formed inside and an extending portion 92 and an operating portion 93 formed outside. The leaf spring 90 is formed from a single metal plate. The extending portion 92 is a stopper that prevents the guide member 80 from coming too close to the locking hole 92 a as a locking portion that locks the locking claw 87 of the guide member 80 and the stopper 88 of the guide member 80. 92b. In the present embodiment, the locking claw 87 and the locking hole 92a constitute a locking member. The frame portion 94 includes a frame engagement wall 94a that engages with the recess wall 11f of the device frame 11, and a frame engagement wall that is provided on the side opposite to the biasing portion 91 and engages with the recess wall 11g of the device frame 11. 94b and a light passage hole 94c that is provided in the center and allows laser light to pass therethrough. As shown in FIG. 4, the operation unit 93 is attached with a dustproof seal 60.

  Next, a method for fixing the diffraction element 33 to the device frame 11 will be described.

  First, the diffractive element 33 is brought into contact with two element positioning walls 73b formed on the element mounting base 73 of the optical element holder 70 and orthogonal to each other, and is bonded and fixed to the element mounting base 73 with an adhesive.

  The optical element holder 70 to which the diffractive element 33 is bonded and fixed is engaged with the holder engaging wall 83 of the guide member 80 by a slightly protruding guide engaging portion 74 so that the notch 75 is an arc notch of the guide member 80. The element mounting base 73 is inserted into the through hole 84 of the guide member 80 so as to be connected to the guide member 80, thereby being combined with the guide member 80.

  FIG. 13 is a perspective view of the unit 100 as an integrated product of the optical element holder 70, the guide member 80, and the leaf spring 90, as viewed from the front side. FIG. 14 is a perspective view of the unit 100 as viewed from the back side.

  Next, the leaf spring 90 is moved in the extending direction of the optical axis of the diffraction element 33 indicated by the arrow 10a with respect to the unit 100 of the optical element holder 70 and the guide member 80, and the two extending portions 92 are guided members. After elastically deforming while sliding on the inclined surface 87a of the 80 locking claws 87, the locking claws 87 of the guide member 80 are fitted into the locking holes 92a of the extending portion 92 as shown in FIGS. . At this time, the leaf spring 90 is engaged with the spring engagement wall 71 of the optical element holder 70 by the urging portion 91. In addition, the leaf spring 90 can prevent the stopper 92b of the extending portion 92 from coming too far toward the guide member 80 by abutting against the stopper 88 of the guide member 80. Therefore, the leaf spring 90 can prevent the urging portion 91 from being deformed excessively and losing its elastic force.

  15 is a perspective view seen from the front side of the unit 100 including the optical element holder 70, the guide member 80, and the leaf spring 90, and is a view different from FIG.

  Next, the unit 100 of the optical element holder 70, the guide member 80, and the leaf spring 90 is contracted in the extending direction of the optical axis of the diffraction element 33 indicated by the arrow 10a as shown in FIG. As shown in FIG. 6, the frame engaging walls 82a and 82b of the guide member 80 engage with the recessed walls 11f and 11h (see FIGS. 9 and 10) of the apparatus frame 11 (see FIGS. 9 and 10). The direction indicated by the arrow 10a and the direction indicated by the arrow 10b so that the frame engaging walls 94a, 94b of the leaf spring 90 engage with the recessed walls 11f, 11g (see FIGS. 9 and 10) of the apparatus frame 11. Are inserted into the recess 11e (see FIGS. 9 and 10) from the direction indicated by the arrow 10c orthogonal to both. At this time, the unit 100 is inserted into the recess 11e of the apparatus frame 11 by the operator pressing the operating portion 93 of the leaf spring 90. In addition, the leaf spring 90 can prevent the stopper 92b of the extending portion 92 from coming too far toward the guide member 80 by abutting against the stopper 88 of the guide member 80. Therefore, the leaf spring 90 can prevent the urging portion 91 from being deformed excessively and losing its elastic force.

  Further, the recessed walls 11g and 11h of the device frame 11 constitute a pair of wall portions formed in the urging direction of the urging portion 91 of the leaf spring 90, and the urging force of the urging portion 91 indicated by an arrow 10a. The gap in the direction is formed smaller than the width of the unit 100 in the urging direction indicated by the arrow 10a. Therefore, when the unit 100 is mounted on the apparatus frame 11, it needs to be in a state of being contracted in the extending direction of the optical axis of the diffraction element 33 indicated by the arrow 10a as shown in FIG. When the unit 100 is contracted in the extending direction of the optical axis of the diffractive element 33 indicated by the arrow 10a as shown in FIG. 15, the engaging claw 87 of the guide member 80 and the extension of the leaf spring 90 are provided. The locking member formed by the locking hole 92a of the existing portion 92 is unlocked.

(Adjustment of the position in the direction indicated by the arrow 10b orthogonal to the optical axis of the diffraction element 33)
The unit 100 is moved in the direction indicated by the arrow 10b while the frame engaging walls 82a and 82b of the guide member 80 are engaged with the recessed walls 11f and 11h (see FIGS. 9 and 10) of the apparatus frame 11. It is done. Accordingly, the position of the diffraction element 33 mounted on the optical element holder 70 is adjusted in the direction indicated by the arrow 10b.

  Here, in the unit 100, the spring engaging wall 71 of the optical element holder 70 is urged toward the concave wall 11h of the apparatus frame 11 by the urging portion 91 of the leaf spring 90. The wall 82b can be moved stably while engaging the concave wall 11h of the apparatus frame 11.

  When the adjustment of the position in the direction indicated by the arrow 10b orthogonal to the optical axis of the diffraction element 33 is completed, the guide member 80 is coated with the ultraviolet curable adhesive on the notch 86, and the apparatus frame 11 is applied with the ultraviolet curable adhesive. And glued and fixed. As a result, the guide member 80 cannot move relative to the apparatus frame 11, so that the optical element holder 70 combined with the guide member 80 and the diffraction element 33 mounted on the optical element holder 70 are attached to the apparatus frame 11. On the other hand, it cannot move in the direction indicated by the arrow 10b.

(Adjustment of the angle of the rotation direction around the optical axis of the diffraction element 33)
When the guide member 80 is fixed by the ultraviolet curable adhesive, the optical element holder 70 adjusts the optical axis of the diffraction element 33 while the arc wall 73a of the element mounting base 73 engages the arc wall 81 of the guide member 80. Rotated as center. Thereby, the angle of the rotation direction about the optical axis of the diffraction element 33 mounted on the optical element holder 70 is adjusted. In the optical element holder 70, the fulcrum of the rotating jig (not shown) is disposed in the circular arc notch 85 of the guide member 80, and the operating point of the rotating jig is disposed in the notch 75. The rotating jig is rotated by being rotated about the fulcrum.

  Here, in the optical element holder 70, since the spring engaging wall 71 is urged toward the holder engaging wall 83 side of the guide member 80 by the urging portion 91 of the leaf spring 90, the guide engaging portion 74 becomes the guide member. It can be stably rotated while engaging the 80 holder engaging walls 83.

  When the adjustment of the angle of the rotation direction around the optical axis of the diffractive element 33 is completed, the ultraviolet curable adhesive is applied in the vicinity of the recessed wall 11i of the apparatus frame 11, and the apparatus frame 11, The optical element holder 70, the guide member 80, and the leaf spring 90 are bonded and fixed to each other. As a result, the optical element holder 70 cannot move with respect to the apparatus frame 11, so that the diffractive element 33 mounted on the optical element holder 70 cannot rotate about the optical axis with respect to the apparatus frame 11.

  Finally, as shown in FIG. 4, the dustproof seal 60 is affixed to the operation portion 93 of the leaf spring 90.

  As described above, since the optical element holder 70, the guide member 80, and the leaf spring 90 are the unit 100 before the optical element holder 70 is mounted on the apparatus frame 11, the optical head apparatus 10 is attached to the apparatus frame 11. The workability when the optical element holder 70 is mounted can be improved as compared with the prior art.

  In the optical head device 10, the optical element holder 70, the guide member 80, and the leaf spring 90 are the unit 100 before the optical element holder 70 is mounted on the apparatus frame 11. The urging state of can be confirmed in advance. On the other hand, in the configuration in which the compressed leaf spring 90 is mounted between the apparatus frame 11 and the optical element holder 70 after the optical element holder 70 and the guide member 80 are brought into contact with the apparatus frame 11, Since it is difficult to clearly see the urging state of the urging portion 91, even if a residual stress in a direction different from the urging direction is generated in the urging portion 91 of the leaf spring 90, the optical element holder 70 is not affected. In some cases, the urging unit 91 is left without being adjusted. According to the present invention, after the optical element holder 70 and the guide member 80 are brought into contact with the apparatus frame 11, the compressed leaf spring 90 is mounted between the apparatus frame 11, the optical element holder 70, and the guide member 80. Compared with the configuration, it is possible to suppress the occurrence of residual stress in a direction different from the urging direction in the urging portion 91 of the leaf spring 90, and the urging force can be obtained efficiently. In the configuration in which the compressed leaf spring 90 is mounted between the apparatus frame 11 and the optical element holder 70 after the optical element holder 70 and the guide member 80 are brought into contact with the apparatus frame 11, the mounting direction is limited. Therefore, when determining the shape of the urging portion 91 in consideration of the mounting direction, the degree of freedom is reduced. The optical head device 10 is compared with a configuration in which a compressed leaf spring 90 is mounted between the device frame 11 and the optical element holder 70 after the optical element holder 70 and the guide member 80 are brought into contact with the device frame 11. Thus, the degree of freedom in the mounting direction of the leaf spring 90 with respect to the optical element holder 70 can be improved, and the degree of freedom in the shape of the urging portion 91 can be improved.

  Further, the locking hole 92 a of the leaf spring 90 is configured to be locked from the biasing direction of the biasing portion 91. Therefore, in the optical head device 10, the plate spring 90 is configured to be unit 100 as compared with the case where the locking hole 92 a of the plate spring 90 is configured to be locked from a direction other than the biasing direction of the biasing portion 91. Since it is possible to prevent the biasing portion 91 of the leaf spring 90 from being deformed in a direction other than the biasing direction when it is incorporated into the spring spring 90, the remaining biasing portion 91 of the leaf spring 90 has a direction different from the biasing direction. The generation of stress can be suppressed, and the urging force can be obtained efficiently.

  Unlike the case in which the locking hole 92a of the plate spring 90 is locked from a direction other than the biasing direction of the biasing portion 91, the optical head device 10 has a biasing force applied by the biasing portion 91. Since the biasing portion 91 is not shifted in a direction other than the biasing direction while being generated, a shape for smoothly incorporating the leaf spring 90 into the unit 100 even if the biasing portion 91 is shifted in a direction other than the biasing direction while generating a biasing force. The urging portion 91 is not required to be provided, and the urging portion 91 is compared with the case where the locking hole 92a is configured to be locked from a direction other than the urging direction of the urging portion 91. The degree of freedom of the shape can be improved, and the shape of the urging portion 91 can be made highly springy.

  Further, the urging portion 91 of the leaf spring 90 has a plane passing through the optical axis of the diffraction element 33 orthogonal to the direction indicated by the arrow 10c that is moved when the unit 100 is mounted on the apparatus frame 11, and the optical axis. The plane is symmetrical with respect to a plane orthogonal to the street plane. Therefore, the optical head device 10 can urge the optical element holder 70 in a balanced manner by the urging portion 91 of the leaf spring 90, so that the adjustment operation can be performed smoothly.

  In addition, the leaf spring 90 can prevent the stopper 92b of the extending portion 92 from coming too far toward the guide member 80 by abutting against the stopper 88 of the guide member 80. Therefore, the leaf spring 90 can prevent the urging portion 91 from being deformed excessively and losing its elastic force.

  The unit 100 is composed of three parts: an optical element holder 70, a guide member 80, and a plate spring 90. The unit 100 includes two parts, a holder that holds the diffraction element 33 and a plate spring that is locked to the holder. It may be constituted by. In that case, a locking claw similar to the locking claw 87 of the guide member 80 is provided in the optical element holder 70, and the locking claw is engaged with the locking hole 92a of the leaf spring 90 by the locking claw.

1 is a perspective view of an optical head device according to an embodiment of the present invention. It is a disassembled perspective view of the optical head apparatus shown in FIG. FIG. 2 is a perspective view of the optical head device shown in FIG. 1 with some components removed. FIG. 2 is a bottom view of the optical head device shown in FIG. 1. FIG. 2 is a bottom view of a part of the optical head device shown in FIG. 1 in a state where a dustproof seal is not affixed. FIG. 2 is a perspective view of a part of the optical head device shown in FIG. 1 in a state where a dustproof seal is not affixed. It is the disassembled perspective view seen from the front side of the optical element holder, guide member, and leaf | plate spring which are shown in FIG. It is the disassembled perspective view seen from the back side of the optical element holder shown in FIG. 5, a guide member, and a leaf | plate spring. It is a bottom view of the apparatus frame shown in FIG. FIG. 2 is a perspective view of a part of the apparatus frame shown in FIG. 1. It is a front view of the optical element holder shown in FIG. It is the perspective view seen from the front side of the optical element holder shown in FIG. It is the perspective view seen from the front side of the unit of the optical element holder shown in FIG. 5, a guide member, and a leaf | plate spring. It is the perspective view seen from the back side of the unit shown in FIG. It is the perspective view seen from the front side of the unit shown in FIG. 13, Comprising: It is a figure of a state different from FIG.

Explanation of symbols

10 Optical Head Device 11 Device Frame (Base)
11g, 11h Recessed walls (a pair of walls)
21, 22 Laser light source device (laser light source)
24 Light receiving element for signal detection (light receiving element)
33 Diffraction element (optical element)
70 Optical element holder 80 Guide member 81 Arc wall (holder engaging portion)
82a, 82b Frame engagement wall (base engagement part)
87 Locking claws (locking members)
90 Leaf spring (biasing member)
91 Biasing part 92a Locking hole (Locking part, locking member)
92b Stopper (Regulator)
100 units (integrated product)

Claims (8)

A laser light source, a light receiving element, an optical element constituting at least a part of an outward path for guiding laser light emitted from the laser light source to an optical recording disk and a return path for guiding reflected light from the optical recording disk to the light receiving element; In the optical head device having the laser light source, the light receiving element and a base on which the optical element is mounted,
An optical element holder on which the optical element is placed;
A biasing member that biases the optical element holder toward the base so as to hold the position of the optical element holder with respect to the base;
The biasing member includes a biasing portion that biases the optical element holder toward the base by a restoring force of elastic deformation when the optical element holder and the biasing member are mounted on the base, and the optical An optical head comprising: an element holder and an urging member that integrates the optical element holder and the urging member against the return force before the urging member is mounted on the base. apparatus. A guide member having a holder engaging portion with which the optical element holder engages rotatably about the optical axis of the optical element;
The biasing member biases the optical element holder and the guide member toward the base so as to be able to hold the positions of the optical element holder and the guide member with respect to the base,
The guide member has a base engaging portion that engages with the base so as to be slidable on the base in a direction perpendicular to the optical axis,
The urging unit urges the optical element holder and the guide member toward the base by a restoring force of elastic deformation when the optical element holder, the guide member, and the urging member are mounted on the base. And
The locking portion locks the optical element holder, the guide member, and the biasing member against the return force before the optical element holder is mounted on the base, thereby locking the optical element holder, The optical head device according to claim 1, wherein the guide member and the biasing member are integrated.   3. The optical head device according to claim 1, wherein the locking portion is unlocked when the integrated product is mounted on the base. 4. The base has a pair of wall portions formed in a biasing direction of the biasing portion,
The pair of wall portions are formed such that a gap in the urging direction is smaller than a width of the integrated product in the urging direction,
4. The optical head device according to claim 3, wherein the integrated product is mounted on the base by being inserted into the gap.   The optical head device according to claim 1, wherein the locking portion is configured to be lockable from a biasing direction of the biasing portion.   The urging portion includes a plane that passes through the optical axis of the optical element perpendicular to a direction in which the integral product is moved when mounted on the base, and a plane that passes through the optical axis and is orthogonal to the plane. 6. The optical head device according to claim 1, wherein the optical head device is formed symmetrically with respect to the surface. A laser light source, a light receiving element, an optical element constituting at least a part of an outward path for guiding laser light emitted from the laser light source to an optical recording disk and a return path for guiding reflected light from the optical recording disk to the light receiving element; An optical head device having the laser light source, the light receiving element, and a base on which the optical element is mounted,
An optical element holder on which the optical element is placed;
A guide member that holds the optical element holder in a state where the optical element is adjusted with respect to the optical axis, and a biasing member that biases the guide member toward the base side along the optical axis. By arranging, the position of the guide member with respect to the base is held, and before placing the optical element holder, the guide member, and the biasing member on the base, the optical element holder, the guide member, and the biasing An optical head device comprising a locking member that locks members together.   2. The biasing member according to claim 1, wherein the biasing member is biased by the biasing member when the latching portion is latched and the optical element holder and the biasing member are integrated. An optical head device comprising a restricting portion for restricting movement from the position to the biasing direction.

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