JP2006012260A - Optical pickup and disk drive device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the number of components, to achieve the miniaturization, and to reduce the thickness in an optical pickup and a disk drive device. <P>SOLUTION: A press cover 29 for pressing at least a part of the plurality of optical components among the plurality of optical components and for permitting the positional adjustment of each optical component in the pressed state relative to a mobile base 7 is provided. The press cover is integrally formed of a plate-like metal material, and a plurality of pressing parts 31, 32, 33, 34 for individually pressing the respective optical components to the press cover are provided so as to be adjacent each other. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an optical pickup and a disk drive device. More specifically, the present invention relates to a technical field in which a plurality of pressing portions positioned adjacent to a pressing cover that presses a plurality of optical components arranged on a moving base are provided to reduce the number of components and reduce the size and thickness.

  2. Description of the Related Art There is a disk drive device that records and reproduces information signals on and from a disk-shaped recording medium such as an optical disk and a magneto-optical disk. An optical pickup for irradiating the recording medium with laser light is provided.

  The optical pickup includes a moving base moved in the radial direction of the disc-shaped recording medium, an objective lens driving device arranged on the moving base, and a plurality of required optical components arranged on the moving base.

  Optical components include a light emitting element such as a laser diode that emits laser light, a grating lens that diffracts the laser light into multiple beams, a beam splitter that controls the traveling direction of the laser light, and a parallel beam of laser light A collimator lens, a light receiving element for receiving the laser beam reflected by the disk-shaped recording medium, and the like are provided.

  Such an optical pickup has a pressing cover attached to the moving base in order to prevent dust from adhering to each optical component and to press the optical components when adjusting the position of the optical component with respect to the moving base. There are some (see, for example, Patent Document 1).

  The optical pickup described in Patent Document 1 has a pressing cover made of a metal material (in Patent Document 1, “attaching sheet metal 16”), and is pressed against the pressing cover with a bent piece. A movable base is provided by means of a bent piece and a resilient piece by pressing a stem base on which a plurality of optical elements such as a semiconductor laser and a light receiving element are arranged. Is pressed against.

  In this way, the stem base is pressed against the moving base with the bent piece and the elastic piece, thereby achieving a cover function for the stem base and a function for preventing rattling when the position of the stem base is adjusted.

Japanese Patent Laid-Open No. 2003-123297

  By the way, in the above-mentioned conventional optical pickup, a pressing cover is used as a dedicated part for the stem base which is one part among the optical parts arranged on the moving base, and other optical parts For example, it does not function as a pressing cover for a grating lens, a collimator lens, a beam splitter, or the like.

  However, even with these optical components such as the grating, collimator lens, and beam splitter, it is necessary to adjust the position with respect to the moving base and to prevent dust. Therefore, another holding cover for holding the grating lens or the like is required.

  In particular, in recent years, the improvement of the functionality of the optical pickup has been remarkable, and there are many optical components arranged on the moving base. In such an optical pickup, the number of components is particularly large. In addition, it is necessary to reduce the size and thickness.

  Accordingly, it is an object of the present invention to overcome the above-described problems, reduce the number of parts, and reduce the size and thickness of the optical pickup and the disk drive device.

  In order to solve the above-described problems, the optical pickup and the disk drive device of the present invention press the at least some of the plurality of optical components and adjust the position of each optical component with respect to the moving base in the pressed state. A pressing cover is provided, and the pressing cover is integrally formed of a plate-like metal material, and a plurality of pressing portions for pressing each optical component separately are provided on the pressing cover.

  Therefore, in the optical pickup and the disk drive device of the present invention, a plurality of optical components are pressed at once by the pressing cover.

  The optical pickup of the present invention includes a moving base that is moved in the radial direction of a disk-shaped recording medium mounted on a disk table, an objective lens driving device that is disposed on the moving base, and a light emitting element that emits laser light. And an optical pickup including a plurality of optical components including a light receiving element that receives laser light emitted from the light emitting element, and holds down at least some of the plurality of optical components. Provided with a pressing cover that enables adjustment of the position of each optical component relative to the moving base in the pressed state, the pressing cover is integrally formed of a plate-shaped metal material, and a plurality of pressing members that press each optical component separately on the pressing cover The portions are provided adjacent to each other.

  Therefore, it is possible to reduce the number of parts without requiring a pressing cover for each optical component, and since a plurality of pressing portions are provided adjacent to each other, the optical components are arranged closer to each other. The optical pickup can be reduced in size and thickness.

  In addition, since the number of parts attached to the moving base is reduced by reducing the number of parts, the assembling property of the optical pickup can be facilitated.

  In the invention described in claim 2, at least one pressing portion of the pressing portions is provided with a pressing piece portion that holds the optical component and a spring piece portion that elastically contacts the optical component. Since the portion is provided at one end portion of the pressing portion and the spring piece portion is provided at the other end portion of the pressing portion, stabilization in a state where the optical component is pressed can be achieved.

  In the invention described in claim 3, since the plurality of pressing pieces and spring pieces are provided apart from each other in the optical axis direction of the optical component, the optical component is prevented from falling in the optical axis direction. In addition, the occurrence of aberration due to tilting can be prevented.

  In the invention described in claim 4, since the rib punched out in the thickness direction is formed in at least a part of the pressing portion, the strength of the pressing portion is improved, and the optical component is pressed. Adjacent pressing parts do not interfere with each other, and it is possible to prevent deformation and bending of the adjacent pressing parts.

  In the invention described in claim 5, since the pressing projection for pressing the light receiving element is provided on the pressing cover, the position adjustment of the light receiving element with respect to the moving base can be performed easily and reliably.

  The disk drive device of the present invention includes a disk table on which a disk-shaped recording medium is mounted, and an optical pickup that irradiates the disk-shaped recording medium mounted on the disk table with a laser beam through an objective lens. The pickup includes a moving base moved in the radial direction of the disk-shaped recording medium, an objective lens driving device arranged on the moving base, a light emitting element arranged on the moving base to emit laser light, and a laser beam emitted from the light emitting element. A plurality of optical components including a light receiving element for receiving light, wherein at least some of the plurality of optical components are pressed and the movement base of each optical component is pressed A presser cover that enables position adjustment with respect to the plate is provided, and the presser cover is made of a plate-shaped metal material. Integrally formed, characterized in that each optical component holding cover provided adjacent a plurality of pressing portions for pressing on each other.

  Therefore, it is possible to reduce the number of parts without requiring a pressing cover for each optical component, and since a plurality of pressing portions are provided adjacent to each other, the optical components are arranged closer to each other. The optical pickup can be reduced in size and thickness.

  In addition, since the number of parts attached to the moving base is reduced by reducing the number of parts, the assembling property of the optical pickup can be facilitated.

  In the invention described in claim 7, at least one pressing portion of the pressing portions is provided with a pressing piece portion that holds the optical component and a spring piece portion that elastically contacts the optical component. Since the portion is provided at one end portion of the pressing portion and the spring piece portion is provided at the other end portion of the pressing portion, stabilization in a state where the optical component is pressed can be achieved.

  In the invention described in claim 8, since the pressing piece and the spring piece are provided apart from each other in the optical axis direction of the optical component, the optical component is prevented from falling in the optical axis direction. In addition, the occurrence of aberration due to tilting can be prevented.

  In the invention described in claim 9, since the rib punched in the thickness direction is formed in at least a part of the pressing portion, the strength of the pressing portion is improved, and the optical component is pressed. Adjacent pressing parts do not interfere with each other, and it is possible to prevent deformation and bending of the adjacent pressing parts.

  In the invention described in claim 10, since the pressing protrusion for pressing the light receiving element is provided on the pressing cover, the position adjustment of the light receiving element with respect to the moving base can be easily and reliably performed.

  The best mode of an optical pickup and a disk drive apparatus according to the present invention will be described below with reference to the accompanying drawings.

  The disk drive device 1 is configured by arranging required members and mechanisms in an outer casing 2 (see FIG. 1), and the outer casing 2 is formed with a disk insertion slot or a drawer tray (not shown).

  A chassis (not shown) is disposed in the outer casing 2, and the disk table 3 is fixed to the motor shaft of a spindle motor attached to the chassis.

  Parallel guide shafts 4 and 4 are attached to the chassis, and a lead screw 5 that is rotated by a feed motor (not shown) is supported.

  The optical pickup 6 includes a moving base 7, required optical components provided on the moving base 7, and an objective lens driving device 8 disposed on the moving base 7, and is provided at both ends of the moving base 7. The bearing portions 7a and 7b are slidably supported by the guide shafts 4 and 4, respectively.

  The objective lens driving device 8 has an objective lens 8a, and the objective lens 8a is displaced in a focusing direction which is a direction in which the objective lens 8a is separated from or in contact with the disc-shaped recording medium 100 and a tracking direction which is a substantially radial direction of the disc-shaped recording medium 100. The laser light spot irradiated on the recording surface of the disc-shaped recording medium 100 via the lens 8a has a function of condensing on the recording surface and following the recording track.

  When a nut member (not shown) provided on the moving base 7 is screwed into the lead screw 5 and the lead screw 5 is rotated by the feed motor, the nut member is sent in a direction corresponding to the rotation direction of the lead screw 5, The pickup 6 is moved in the radial direction of the disc-shaped recording medium 100 mounted on the disc table 3.

  As the disk-shaped recording medium 100, for example, a DVD (Digital Versatile Disc) 100a and a CD (Compact Disc) 100b are selectively used.

  In the disk drive device 1 configured as described above, when the disk table 3 is rotated in accordance with the rotation of the spindle motor, the disk-shaped recording medium 100 mounted on the disk table 3, that is, the DVD 100a or the CD 100b is loaded. At the same time, the optical pickup 6 is moved in the radial direction of the disc-shaped recording medium 100 to perform a recording operation or a reproducing operation on the disc-shaped recording medium 100.

  As shown in FIG. 2, the optical pickup 6 includes, as optical components for the DVD 100a, a first light emitting element 9, a grating lens 10, a beam splitter 11, a first collimator lens 12, an anamorphic prism 13, 1/4. The wave plate 14, the rising mirror 15, the first monitor light receiving element 16, the multi-lens 17, and the first light receiving element 18 are provided on the moving base 7.

  As shown in FIG. 2, the optical pickup 6 includes a hologram unit 19, a reflecting prism 20, a second collimator lens 21, an anamorphic prism 13, a quarter-wave plate 14, and standing parts as optical components for the CD 100 b. The raising mirror 15 and the second monitor light receiving element 22 are provided on the movable base 7 respectively. Inside the hologram unit 19, a second light emitting element 19a and a second light receiving element 19b are provided.

  As the first light emitting element 9, for example, a semiconductor laser that emits laser light having a wavelength of about 660 nm is used, and as the second light emitting element 19a, for example, laser light having a wavelength of about 785 nm is emitted. Semiconductor diodes are used.

  The grating lens 10 has a function of diffracting the laser light emitted from the first light emitting element 9 and separating it into a main light beam and a sub light beam.

  The beam splitter 11 has a mirror surface 11a having wavelength selectivity, and the laser beam having a wavelength of about 660 nm emitted from the first light emitting element 9 is reflected by the mirror surface 11a and reflected by the disk-shaped recording medium 100. It has a function of transmitting the return light.

  The first collimator lens 12 and the second collimator lens 21 each have a function of converting the laser light emitted from the first light emitting element 9 or the second light emitting element 19a into parallel light beams.

  The anamorphic prism 13 has a plurality of refractive surfaces, and has a function of beam-shaping the laser light emitted from the first light-emitting element 9 or the second light-emitting element 19a and guiding it in a predetermined direction.

  The quarter wave plate 14 has a function of converting linearly polarized light and circularly polarized light with respect to the laser light emitted from the first light emitting element 9 or the second light emitting element 19a.

  The raising mirror 15 has a function of raising the laser light emitted from the first light emitting element 9 or the second light emitting element 19a and causing it to enter the objective lens 8a.

  The first monitor light receiving element 16 and the second monitor light receiving element 22 each have a function of detecting the light intensity of the laser light emitted from the first light emitting element 9 or the second light emitting element 19a.

  The multi lens 17 has a function of condensing the return light emitted from the first light emitting element 9 and reflected by the disc-shaped recording medium 100 onto the light receiving surface of the first light receiving element 18.

  The reflecting prism 20 has a plurality of reflecting surfaces, and has a function of guiding the laser light emitted from the second light emitting element 19a in a predetermined direction.

  In the optical pickup 6 configured as described above, when laser light having a wavelength of about 660 nm is emitted from the first light emitting element 9, the laser light travels toward the grating lens 10, and the main luminous flux and sub-light are transmitted by the grating lens 10. The light is separated into light beams and is incident on the beam splitter 11. The laser beam incident on the beam splitter 11 is reflected by the mirror surface 11a and converted into a parallel beam by the first collimator lens 12, and a part of the laser beam is reflected by the anamorphic prism 13 and received by the first monitor light receiving element 16. The The light that has not been reflected by the anamorphic prism 13 is converted in its optical path by the anamorphic prism 13 and beam-shaped, and its polarization direction is converted by the quarter-wave plate 14 and is raised by the rising mirror 15 and then passed through the objective lens 8a. The light is condensed on the recording surface of the DVD 100 a mounted on the disk table 3. The laser beam condensed on the recording surface of the DVD 100a is reflected by the recording surface and returned as return light again to the objective lens 8a, the rising mirror 15, the quarter wavelength plate 14, the anamorphic prism 13, and the first collimator lens. 12 enters the beam splitter 11. The return light incident on the beam splitter 11 is transmitted through the mirror surface 11a of the beam splitter 11, is incident on the first light receiving element 18 through the multi lens 17, is photoelectrically converted, and is recorded on, for example, the DVD 100a. Information signals are reproduced.

  On the other hand, when laser light having a wavelength of about 785 nm is emitted from the second light emitting element 19a of the hologram unit 19, the laser light is separated by the reflecting prism 20, and one of the separated lights is the second light receiving element 22 for monitoring. Is received. The other separated light is converted into a parallel light flux by the second collimator lens 21, reflected by the anamorphic prism 13, beam-shaped, converted in polarization direction by the quarter-wave plate 14, and raised by the rising mirror 15. The collected light is condensed on the recording surface of the CD 100b mounted on the disk table 3 through the objective lens 8a. The laser beam condensed on the recording surface of the CD 100b is reflected by the recording surface and returned again as the objective lens 8a, the rising mirror 15, the quarter wavelength plate 14, the anamorphic prism 13, and the second collimator lens. 21 is incident on the second light receiving element 19b of the hologram unit 19 through the reflecting prism 20 and photoelectrically converted, and for example, the information signal recorded on the CD 100b is reproduced.

  When the laser light is emitted from the first light emitting element 9 or the second light emitting element 19a and the first monitor light receiving element 16 or the second monitor light receiving element 22 receives the laser light as described above, The light intensity of each laser beam is detected by one monitor light receiving element 16 or the second monitor light receiving element 22, and the output of the first light emitting element 9 or the second light emitting element 19a is respectively determined based on the detection result. It is controlled to be substantially constant at all times.

  On the lower surface 7 c side of the moving base 7, an arrangement recess 7 d opened downward is formed.

  Of the optical components described above, the components other than the first light emitting element 9, the first monitor light receiving element 16, the first light receiving element 18, the hologram unit 19, and the second monitor light receiving element 22 are as follows. The first light-emitting element 9, the first monitor light-receiving element 16, the first light-receiving element 18 and the hologram unit 19, and the second monitor light-receiving element 22 are arranged in the arrangement recess 7 d formed in the moving base 7. Are attached to the side surface 7e of the moving base 7, respectively.

  A circuit board 23 is arranged at a position adjacent to the hologram unit 19 on the side surface 7e of the moving base 7, and a driver 23a for driving the first light emitting element 9 and the second light emitting element 19a is arranged on the circuit board 23. (See FIG. 3 and FIG. 4).

  Receiving protrusions 24, 24,... Protruding in a direction approaching each other are provided on each side surface forming the arrangement recess 7 d of the moving base 7 (see FIGS. 8 to 11). The receiving projections 24, 24,... Are displaced so as to go inward as they go upward, and have inclined surfaces 24a, 24a,.

  A part of each side surface forming the arrangement recess 7d is formed as a reference surface 25, 26 (see FIGS. 3, 8, and 9). The reference surface 25 is a surface on which the grating lens 10 is pressed in the optical axis direction, and the reference surface 26 is a surface on which the quarter wavelength plate 14 is pressed in the optical axis direction.

  One end of the flexible printed wiring board 27 is connected to each predetermined part attached to the moving base 7 (see FIGS. 3 to 5). The flexible printed wiring board 27 is composed of a main board part 27a and sub board parts 27b, 27b,... Branched from the main board part 27a, and the main board part 27a and the sub board parts 27b, 27b,. The portion is attached to the upper surface 7 f of the moving base 7 by the attachment metal plate 28.

  The front end portion of the main substrate portion 27a is connected to a power circuit (not shown), and the front end portions of the sub substrate portions 27b, 27b,... Are respectively the first light emitting element 9, the first light receiving element 18, the hologram unit 19, It is connected to a driver 23a and the like. In addition, each of the sub-board portions 27b, 27b,... Is bent to connect to each portion.

  Support holes 7g and 7g and support cutouts 7h and 7h are formed at predetermined positions on the lower surface 7c or the side surface 7e of the moving base 7 (see FIG. 3). The support holes 7g and 7g and the support cutouts 7h and 7h are formed in the support holes 7g and 7h. Each has an engaging portion (not shown).

  On the upper surface 7f of the moving base 7, screw holes 7i and mounting pins 7j are formed at positions substantially opposite to each other with the hologram unit 19 in between (see FIG. 4). On the lower surface 7c, mounting pins 7k and engaging recesses 7l are formed at positions substantially opposite to each other across the hologram unit 19 (see FIG. 3).

  A pressing cover 29 is attached to the lower surface 7c of the moving base 7 (see FIGS. 3 and 5). Each part of the presser cover 29 is integrally formed of a plate-shaped metal material, for example, SUS (stainless steel) (see FIG. 6). The pressing cover 29 is formed by punching a plate-shaped metal material into a predetermined shape and then bending a predetermined portion.

  The pressing cover 29 functions as a pressing means for pressing each optical component arranged on the moving base 7 in a state where the position of the optical component 7 can be adjusted, as well as preventing dust from adhering to each optical component and preventing laser light from diverging. It also functions as a means for prevention.

  The holding cover 29 includes a main surface portion 30 and each portion protruding upward from the main surface portion 30.

  As shown in FIGS. 6 and 7, the main surface portion 30 is provided with a first pressing portion 31, a second pressing portion 32 and a third pressing portion 33 which are adjacent to each other in order, and the third pressing portion 33. A flat portion on the opposite side of the second pressing portion 32 is provided as a fourth pressing portion 34 across the gap.

  The first pressing portion 31 includes a first frame portion 35 formed in a frame shape and an inner portion thereof, and a pair of connecting piece portions 36 and 36 that are continuous inside the first frame portion 35. The connecting piece portions 36, 36 have a pressing spring surface portion 37 that is continuous with the connecting piece portions 36.

  The second pressing portion 32 includes a second frame portion 41 that is continuous with the first frame portion 35, a rib surface portion 39 that is formed by punching upward from the second frame portion 41, and a rib surface portion 39. It consists of a holding spring piece 40 protruding from one side edge. The holding spring piece portion 40 is inclined so as to be displaced upward as it moves away from the rib surface portion 39, and an elastic contact portion 40b inclined so as to be displaced downward as it goes to the tip, continuing to the base portion 40a. It consists of.

  The third pressing portion 33 includes a third frame portion 41 and four pieces. That is, the four pieces are a pair of holding pieces that protrude inward from the inner opening edge on one side of the third frame 41 that is formed in a frame shape and continues to the second frame 38. 42 and 42 and a pair of spring pieces 43 and 43 projecting inward from the inner opening edge on the other side of the third frame portion 41, and the spring pieces 43 and 43 are formed on the opening edge side. A base end portion 43a, 43a that is inclined to be displaced upward as it moves away from the opening edge, and a tip end portion that is continuous to the base end portions 43a, 43a and is inclined to be displaced downward as it goes to the front end 43b, 43b. The holding piece portions 42 and 42 are formed by punching upward.

  At predetermined positions of the third frame portion 41, ribs 41a, 41a, 41a formed by being driven out upward are provided.

  The ribs 41a, 41a and 41a formed on the rib surface portion 39 and the third frame portion 41 of the second pressing portion 32 improve the strength of the second pressing portion 32 and the third pressing portion 33, respectively. The rib surface portion 39 and the ribs 41a, 41a, 41a are used to hold the spring spring portion 37 of the first pressing portion 31, the pressing spring piece portion 40 of the second pressing portion 32, and the spring of the third pressing portion 33. The pieces 43, 43 do not interfere with each other when the optical components are pressed by these spring forces, and the first pressing portion 31, the second pressing portion 32, and the third pressing portion 33 are not deformed. It is possible to prevent bending.

  A pressing projection 44 projects from the first frame portion 35. The pressing protrusion 44 includes an arm portion 44a that is continuous with the first frame portion 35 and protrudes laterally, and a restricting portion 44b that protrudes upward from the tip of the arm portion 44a.

  A pair of spring arms 45, 45 project upward from the side edge of the fourth pressing portion 34.

  From a predetermined position on the outer peripheral edge of the main surface portion 30, engagement protrusions 46, 46,... Are provided upward. .. Are formed at the distal ends of the engaging protrusions 46, 46,.

  The pressing cover 29 configured as described above has the engaging claws 46a, 46a,... Of the engaging projections 46, 46,. 7h and 7h are engaged with the engaging portions and attached to the lower surface 7c of the moving base 7.

  In a state where the pressing cover 29 is attached to the moving base 7, the multi-lens 17 is pressed by the first pressing portion 31, the grating lens 10 is pressed by the second pressing portion 32, and the third pressing portion 33 is pressed. The first collimator lens 12 is pressed.

  The multi lens 17 is elastically pressed from below by the pressing spring surface portion 37 of the first pressing portion 31 and is pressed against the inclined surfaces 24 a and 24 a of the receiving projections 24 and 24. In this state, the position of the multi-lens 17 is adjusted with respect to the moving base 7 in the optical axis direction, and is fixed to the moving base 7 with an adhesive or the like after the position adjustment. When the position of the multi lens 17 is adjusted, the multi lens 17 is slid with respect to the holding spring surface portion 37.

  The beam splitter 11 is covered with a pressing cover 29.

  As shown in FIGS. 8 and 9, the grating lens 10 includes a holder portion 10a and a lens portion 10b held by the holder portion 10a. The holder portion 10a is formed in a substantially annular shape and has an inclined surface 10c extending in the circumferential direction. have.

  In the grating lens 10, the inclined surface 10 c of the holder portion 10 a is elastically pressed obliquely upward by the elastic contact portion 40 a of the holding spring piece portion 40 of the second holding portion 32, and the holder 10 a is a reference in the arrangement recess 7 d. While being pressed against the surface 25, the inclined surface 10 c of the holder 10 a is pressed against the inclined surfaces 24 a and 24 a of the receiving projections 24 and 24. In this state, the position of the grating lens 10 is adjusted with respect to the moving base 7 in the direction around the optical axis, and after the position adjustment, the grating lens 10 is fixed to the moving base 7 with an adhesive or the like. When the position of the grating lens 10 is adjusted, the grating lens 10 is slid with respect to the holding spring piece 40.

  As shown in FIGS. 10 and 11, the first collimator lens 12 includes a holder part 47 and a lens part 48 held inside the holder part 47. The holder part 47 has a lower peripheral surface. It is formed on a flat surface 47a that faces downward, and an upper half circumferential surface is formed on an arc surface 47b. Since the lens portion 48 is formed in a substantially disc shape, the central portion of the flat surface 47a is formed as a projecting surface 47c projecting downward from the flange, and the surfaces on both sides thereof are formed by the projecting surface 47c. It is formed as pressed surfaces 47d and 47d positioned above.

  In the first collimator lens 12, one pressed surface 47 d of the holder portion 47 is pressed by the pressing piece portions 42, 42 of the third pressing portion 33, and the other pressed surface 47 d is pressed by the third pressing portion 33. The spring pieces 43 and 43 are elastically pressed upward and the arcuate surface 47b is pressed against the inclined surfaces 24a and 24a of the receiving projections 24 and 24. Accordingly, the first collimator lens 12 is pressed by the spring pieces 43 and 43 that are spaced apart in the optical axis direction, as well as the holding pieces 42 and 42 that are spaced apart in the optical axis direction.

  In this state, the position of the first collimator lens 12 is adjusted with respect to the moving base 7 in the optical axis direction, and is fixed to the moving base 7 with an adhesive or the like after the position adjustment. When the position of the first collimator lens 12 is adjusted, the first collimator lens 12 is slid with respect to the spring pieces 43 and 43.

  As described above, the first collimator lens 12 is covered on the opposite sides with the projecting surface 47c sandwiched between the pressing pieces 42 and 42 and the spring pieces 43 and 43 located on the opposite sides. Since the pressing surfaces 47d and 47d are pressed, stabilization in the pressed state can be achieved.

  Further, since the first collimator lens 12 is pressed by the pressing pieces 42 and 42 and the spring pieces 43 and 43, the pressed surfaces 47d and 47d positioned above the projecting surface 47c, respectively. 42 and the spring pieces 43, 43 can be prevented from projecting downward from the projecting surface 47c, and the spectral pickup 6 can be made thinner.

  Furthermore, since the first collimator lens 12 is pressed by the holding pieces 42 and 42 and the spring pieces 43 and 43 that are located apart in the optical axis direction, the first collimator lens 12 can be prevented from falling in the optical axis direction. At the same time, it is possible to prevent the occurrence of aberration due to tilting.

  The anamorphic prism 13, the reflecting prism 20, and the second collimator lens 21 are covered with a pressing cover 29.

  In a state where the pressing cover 29 is attached to the moving base 7, the quarter-wave plate 14 is elastically pressed against the reference surface 26 in the arrangement recess 7d by the spring arms 45, 45. In this state, the position of the quarter-wave plate 14 is adjusted with respect to the moving base 7 in the direction around the optical axis, and the position is adjusted and fixed to the moving base 7 with an adhesive or the like. When the position of the quarter-wave plate 14 is adjusted, the quarter-wave plate 14 is slid with respect to the spring arms 45 and 45.

  In a state in which the pressing cover 29 is attached to the moving base 7, the first light receiving element 18 is pressed in the optical axis direction by the restricting portion 44 b of the pressing protrusion 44, and the first light receiving element 18 is moved to the moving base 7. Is pressed against the side surface 7e. The position of the first light receiving element 18 is adjusted with respect to the moving base 7 in a plane orthogonal to the optical axis. As described above, in the state where the pressing cover 29 is attached to the moving base 7, Since the first light receiving element 18 is pressed against the side surface 7e of the moving base 7 by the restricting portion 44b of the pressing protrusion 44, the position of the first light receiving element 18 can be adjusted easily and reliably.

  As described above, in the disk drive device 1, the pressing cover 29 that enables the position adjustment of each optical component relative to the moving base 7 in a state where a plurality of optical components are pressed is integrated with the plate-like metal material. Since it is formed, it is possible to reduce the number of parts without requiring a pressing cover for each optical component, and since a plurality of pressing portions 31, 32, 33, 34 are provided adjacent to each other, It is possible to cope with the case where the optical components are arranged close to each other, and the optical pickup 6 can be reduced in size and thickness.

  Further, since the number of parts attached to the moving base 7 is reduced by reducing the number of parts, the assemblability of the optical pickup 6 can be facilitated.

  A shield cover 49 that shields radiation from the hologram unit 19 and the driver 23 is attached to the moving base 7 (see FIGS. 3 to 5).

  Each part of the shield cover 49 is integrally formed of a plate-shaped metal material such as phosphor bronze (see FIGS. 12 to 14). The shield cover 49 is formed in a horizontally long shape as a whole along the direction in which the side surface 7e of the moving base 7 extends by punching a plate-shaped metal material into a predetermined shape and then bending a predetermined portion.

  The shield cover 49 is positioned to face the first surface portion 50 attached to the upper surface 7 f of the moving base 7, the second surface portion 51 attached to the lower surface 7 c of the moving base 7, and the side surface 7 e of the moving base 7. And a third surface portion 52.

  The first surface portion 50 includes an upper step portion 53 that is positioned in order from the side farther from the third surface portion 52, a middle step portion 54 that is slightly lower than the upper step portion 53, and a lower step that is slightly lower than the middle step portion 54. The upper step portion 53 and the middle step portion 54 are separated by an upper step portion 56 having a low height, and the middle step portion 54 and the lower step portion 55 are separated by a lower step portion 57 having a low height.

  The upper step portion 53 is provided with a first protrusion portion 53a protruding in the longitudinal direction and a second protrusion portion 53b protruding in a direction substantially orthogonal to the first protrusion portion 53a. A screw insertion hole 53c is formed in one protrusion 53a, and a mounting hole 53d is formed in the second protrusion 53b. The upper end 53 is provided with a pressing protrusion 53e formed in a substantially triangular shape at a position directly beside the second protrusion 53b, and the pressing protrusion 53e protrudes in substantially the same direction as the second protrusion 53b. ing.

  The second surface portion 51 is formed in a planar shape as a whole, and a third protrusion portion 51a protruding in the longitudinal direction and a fourth protrusion protruding in a direction substantially orthogonal to the third protrusion portion 51a. And a mounting hole 51c is formed in the third protrusion 51a. The tip end portion of the fourth projecting portion 51a is bent toward the first surface portion 50 and formed as an engaging piece 51d.

  The third surface portion 52 is configured by a first shielding piece 58, a second shielding piece 59, a third shielding piece 60, a continuous surface 61, and a fourth shielding piece 62, which are sequentially arranged in the left-right direction. The first shielding piece 58, the second shielding piece 59, the third shielding piece 60, the continuous surface 61, and the fourth shielding piece 62 are located close to each other.

  The first shielding piece 58 is formed by projecting upward from the peripheral edge of the second surface portion 51, and is formed in a rectangular shape. The second shielding piece 59 is formed by protruding downward from the periphery of the first surface portion 50, and is formed in a rectangular shape. The third shielding piece 60 is formed by projecting upward from the periphery of the second surface portion 51.

  The continuous surface 61 has an upper edge and a lower edge continuous with the first surface portion 50 and the second surface portion 51, respectively. A central portion of the continuous surface 61 in the vertical direction is formed as a protruding portion 61a that protrudes outward.

  The fourth shielding piece 62 is formed by protruding upward from the peripheral edge of the second surface portion 51.

  The second surface 51 includes the first shielding piece 58, the second shielding piece 59, the third shielding piece 60, the continuous surface 61, and the fourth shielding piece 62 that are positioned close to each other. They are positioned so as to face different angles, and are formed in a shape that conforms to the outer shape of the hologram unit 19 and the circuit board 23 or the outer shape of the side surface 7e of the moving base 7 corresponding to the portion where these are arranged.

  In the shield cover 49, the mounting pins 7j and 7k of the moving base 7 are respectively inserted into and engaged with the mounted holes 53d of the second projecting portion 53a and the mounted holes 51c of the third projecting portion 51a. The coupling piece 51d is engaged with the engaging recess 7l of the moving base, and the mounting screw 63 is screwed into the screw hole 7i of the moving base 7 through the screw insertion hole 53c of the first projecting portion 53a. 7 is attached.

  The shield cover 49 is attached to the moving base 7 by the mounting screw 63 as described above. However, the mounting of the shield cover 49 to the moving base 7 is not limited to the method using the mounting screw 63. You may use the method by engagement with an attachment pin and a to-be-attached hole, or engagement with an engagement protrusion and an engagement recessed part.

  In the state where the shield cover 49 is attached to the moving base 7 as described above, the first shielding piece 58 and the second shielding piece 59 are positioned so as to cover the hologram unit 19, and the third shielding piece 60. The continuous surface 61 and the fourth shielding piece 62 are positioned so as to cover the circuit board 23 and the driver 23a, and the hologram unit 19, the circuit board 23, and the driver 23a are entirely covered by the shield cover 49. At this time, the leading end portion of the circuit board 23 is positioned in the protruding portion 61 a of the continuous surface 61.

  As described above, in the optical pickup 6, the hologram unit 19 and the driver 23 a are covered by the shield cover 49, so that the radiation from the hologram unit 19 or the driver 23 a is shielded by the shield cover 49.

  When the shield cover 49 is attached to the movable base 7, the bent portion of the sub-board portion 27 b of the flexible printed wiring board 27 is pressed from above by the pressing protrusion 53 e of the first surface portion 50. .

  Therefore, since a dedicated member for pressing the bent portion of the flexible printed wiring board 27 is not required, the number of parts can be reduced.

  The first light emitting element 9 disposed on the side surface 7e of the moving base 7 is covered with a cover body 64 formed by bending a metal material, for example, plate-shaped phosphor bronze. Accordingly, radiation from the first light emitting element 9 is shielded by the cover body 64.

  As described above, in the disk drive device 1, the shield cover 49 that shields the radiation from the hologram unit 19 and the driver 23 a is integrally formed of a plate-shaped metal material, and the third of the shield cover 49 is formed. The surface portion 52 is formed in a shape along the shape of the optical component disposed on the side surface 7e of the moving base 7 or the peripheral portion of the moving base 7.

  Accordingly, there is no large gap between the inner surface of the third surface portion 52 and the side surface 7e of the moving base 7 or each optical component inside the shield cover 49, and the outer shape of the optical pickup 6 is reduced accordingly. The optical pickup 6 can be reduced in size, and the circuit board 23 and the driver 23a in addition to the hologram unit 19 are covered with the single shield cover 49, so that the effect of preventing unnecessary radiation is improved. be able to.

  Further, since the shield cover 49 is formed without using the drawing process, it can be formed in a deep shape, and the degree of freedom in design can be improved.

  In the above, the disk drive device 1 using two types of disc-shaped recording medium 100, DVD 100a and CD 100b, is shown as an example. However, the type of disc-shaped recording medium 100 is not limited to DVD 100a and CD 100b. Other discs such as a Blu-ray disc may be used.

  In addition, the present invention can be applied to a disk drive device in which two types of disk-shaped recording media 100 having different operating wavelengths as described above are used and an optical pickup provided in the disk drive device, and uses one disk-shaped recording medium. The present invention can also be applied to a disk drive device and an optical pickup, and a disk drive device and an optical pickup in which three or more types of disk-shaped recording media 100 having different wavelengths are used.

  The specific shapes and structures of the respective parts shown in the above-described best mode are merely examples of the implementation of the present invention, and the technical scope of the present invention is limited by these. It should not be interpreted in a general way.

FIG. 2 to FIG. 14 show the best mode for carrying out the present invention, and this figure is a schematic perspective view of a disk drive device. It is a conceptual diagram which shows each optical component provided in the optical pick-up, and its optical path. It is an expansion perspective view of the optical pickup which shows a pressing cover and a shield cover separately. It is an expansion perspective view of the optical pickup which shows a shield cover separately. It is an expansion perspective view of an optical pick-up. It is an expansion perspective view of a pressing cover. It is a top view which expands and shows a part of presser cover. It is an expansion disassembled perspective view which shows the holding state of a grating lens. It is an expansion perspective view which shows the holding state of a grating lens. It is an expansion disassembled perspective view which shows the holding | maintenance state of a collimator lens. It is an expansion perspective view which shows the holding state of a collimator lens. It is an expansion perspective view of a shield cover. It is an expansion perspective view of the shield cover shown in the state seen from the angle different from FIG. It is an expanded development view of a shield cover.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 100 ... Disc-shaped recording medium, 1 ... Disc drive apparatus, 3 ... Disc table, 6 ... Optical pick-up, 7 ... Moving base, 8 ... Objective lens drive device, 8a ... Objective lens, 9 ... 1st light emitting element, 18 ... First light receiving element, 19a ... second light emitting element, 19b ... second light receiving element, 29 ... pressing cover, 31 ... first pressing part, 31a ... rib surface part (rib), 32 ... second pressing part 33 ... 3rd pressing surface part, 34 ... 4th pressing part, 41a ... Rib, 42 ... Pressing piece part, 43 ... Spring piece part, 44 ... Pressing projection part

Claims (10)

A moving base that is moved in the radial direction of a disk-shaped recording medium mounted on a disk table, an objective lens driving device disposed on the moving base, a light emitting element that emits laser light disposed on the moving base, and light emission from the light emitting element An optical pickup comprising a plurality of optical components including a light receiving element for receiving the laser beam,
A pressing cover is provided that allows the position of each optical component to be adjusted relative to the moving base while pressing and holding at least some of the plurality of optical components.
The pressing cover is integrally formed of a plate-shaped metal material,
An optical pickup characterized in that a plurality of pressing portions for pressing each optical component separately are provided on the pressing cover. At least one pressing portion of the pressing portions is provided with a pressing piece portion that holds the optical component and a spring piece portion that elastically contacts the optical component,
A holding piece is provided at one end of the holding part,
The optical pickup according to claim 1, wherein the spring piece portion is provided at the other end portion of the pressing portion. The optical pickup according to claim 2, wherein a plurality of the pressing piece portions and the spring piece portions are provided apart from each other in the optical axis direction of the optical component. The optical pickup according to claim 1, wherein a rib punched in a thickness direction is formed on at least a part of the pressing portion. The optical pickup according to claim 1, wherein a pressing protrusion for pressing the light receiving element is provided on the pressing cover. A disk table on which a disk-shaped recording medium is mounted; and an optical pickup that irradiates a laser beam on the disk-shaped recording medium mounted on the disk table via an objective lens. A moving base that is moved in the radial direction; an objective lens driving device that is disposed on the moving base; a light emitting element that emits laser light; and a light receiving element that receives the laser light emitted from the light emitting element. A disk drive device having a plurality of optical components,
A pressing cover is provided that allows the position of each optical component to be adjusted relative to the moving base while pressing and holding at least some of the plurality of optical components.
The pressing cover is integrally formed of a plate-shaped metal material,
A disk drive device, wherein a plurality of pressing portions for pressing each optical component separately are provided on the pressing cover. At least one pressing portion of the pressing portions is provided with a pressing piece portion that holds the optical component and a spring piece portion that elastically contacts the optical component,
A holding piece is provided at one end of the holding part,
The disk drive device according to claim 5, wherein the spring piece portion is provided at the other end portion of the pressing portion. The disk drive device according to claim 7, wherein a plurality of the pressing piece portions and the spring piece portions are provided apart from each other in the optical axis direction of the optical component. The disk drive device according to claim 6, wherein a rib punched in a thickness direction is formed on at least a part of the pressing portion. The disk drive device according to claim 6, wherein a pressing protrusion for pressing the light receiving element is provided on the pressing cover.

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