JP2015164082A - optical pickup device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical pickup device that achieves reduction in the thickness of a whole device while housing an element with a thickness, and an optical disk drive including the optical pickup device.SOLUTION: An optical pickup device 10 includes: a housing 12; a motor 76 for moving an optical element housed in the housing 12; and a cover 56 for covering an open part of the housing 12 in an area in which the optical element is disposed. The cover 56 is provided with an aperture 60, and the motor 76 can be viewed from the aperture 60. A thin portion 56D obtained by thinning the cover 56 is provided at a position where the thin portion 56D overlaps with the motor 76, and therefore, the apex of the motor 76 is away from the cover 56.

Description

  The present invention relates to an optical pickup device. In particular, the present invention relates to an optical pickup device in which a covering portion that covers a housing partially protrudes outward.

  The optical pickup device has a function of irradiating an optical disc with laser light having a predetermined wavelength emitted from a light emitting element, and detecting the laser light reflected by the information recording layer of the optical disc with a light receiving element (Patent Document 1). Thus, an information reading operation or writing operation can be performed on the optical disc.

  In an optical pickup device, an optical element such as a laser device or a light receiving element is accommodated in a housing in which a metal or a resin material is injection-molded. A flexible wiring board connected to these optical elements is disposed on the main surface of the housing, and this flexible wiring board is covered with a cover plate made of a metal plate such as stainless steel.

JP 2005-216436 A

  However, along with the downsizing of notebook personal computers and the like, further downsizing of optical pickup devices housed therein is required, and in particular, it is required to reduce the thickness.

  As a method for achieving a reduction in the thickness of the optical pickup device, it is conceivable to make the housing itself thin. However, if the housing is made too thin, there is a problem that some of the components built in the optical pickup device cannot be sufficiently stored. For example, the mechanism for moving the collimator lens along the optical path is an element having a thickness compared to other elements such as a half mirror, and there is a problem that such an element protrudes from the housing in the thickness direction.

  The present invention has been made in view of such problems, and an object of the present invention is to provide an optical pickup device in which a thin device is achieved as a whole while incorporating an element having a thickness, and an optical disc including the same. To provide an apparatus.

  The optical pickup device according to the present invention includes a housing having a bottom portion, a side wall continuous from the periphery of the bottom portion, an open portion facing the bottom portion, and an optical element housed in an arrangement region including the bottom portion and the side wall. A motor that moves, and a cover that covers the open portion of the housing, wherein at least a part of the motor is exposed from the cover, and the cover is thinned from the inside at a portion overlapping the motor. A portion is provided.

  Furthermore, the optical pickup device of the present invention is housed in an arrangement region composed of a bottom, a housing having a side wall continuous from the periphery of the bottom, and an open portion facing the bottom, and the bottom and the side wall. A motor that moves the element and a cover that covers the open portion of the housing are provided, and at least a part of the motor is exposed from the cover.

  In the present invention, the motor, which is a relatively thick component among the elements housed in the housing, is exposed to the outside from the cover. Thereby, even if a certain amount of tolerance is included in the outer dimensions of the motor, the motor does not interfere with the cover. Furthermore, by exposing the motor from the cover to the outside, heat generated by driving the motor under usage conditions is exposed to the outside, and overheating of the motor is suppressed.

It is a figure which shows the optical pick-up apparatus of this invention. It is a figure which shows the optical pick-up apparatus of this invention, (A) is a top view which shows the optical pick-up apparatus in use condition, (B) is the sectional drawing. It is the perspective view which looked at the optical pick-up apparatus of this invention from the upper direction. It is a figure which shows the optical pick-up apparatus of this invention, (A) is the perspective view which looked at the optical pick-up apparatus from the downward direction, (B) is the perspective view which shows the state which removed the cover. It is a figure which shows the optical pick-up apparatus of this invention, (A) is a perspective view which shows the state which removed the cover, (B) and (C) are sectional drawings. It is a figure which shows the optical pick-up apparatus of this invention, (A) is a perspective view, (B) is a perspective view which shows the state which removed the cover. It is a figure which shows the optical pick-up apparatus of this invention, (A) is a perspective view, (B) and (C) are sectional drawings. It is a figure which shows the cover used for the optical pick-up apparatus of this invention, (A) is a perspective view, (B) to (G) is a figure which shows the manufacturing method. It is a figure which shows the optical pick-up apparatus of this invention, (A) is a perspective view which shows an optical pick-up apparatus partially, (B) and (C) are sectional drawings.

<First Embodiment>
With reference to FIG. 1, in this embodiment, a basic configuration of an optical pickup device will be described.

  The optical pickup device 10 focuses a laser beam of BD (Blu-ray Disc), DVD (Digital Versatile Disk) or CD (Compact Disk) standard on an information recording layer of an optical disc (information recording medium), and records the information. It has a function of receiving reflected light from the layer and converting it into an electrical signal. Thereby, the reading operation or writing operation of information on the optical disc is performed. Here, the optical pickup device 10 does not necessarily correspond to laser beams of three types of standards, and may correspond to laser beams of one or two standards.

  The optical pickup device 10 includes various optical elements built in a housing. As the optical elements, a laser device 14, a diffraction grating 16, a half mirror 22, a quarter wavelength plate 24, a collimator lens 26, an objective lens 40, and a photodetector 18 are illustrated.

  The objective lens 40 is fixed to the upper surface of the lens holder 32, and this lens holder 32 is held by the objective lens driving device 28 so as to be movable via a wire.

  The laser device 14 includes a laser diode, and the laser light of the above-described standard is emitted from the laser diode. Specifically, a laser beam having a blue-violet (blue) wavelength band 395 nm to 420 nm (for example, a wavelength of 405 nm) suitable for BD, a laser beam having a red wavelength band 645 nm to 675 nm (for example, a wavelength of 650 nm) suitable for DVD, or Laser light having an infrared wavelength band of 765 nm to 805 nm (for example, a wavelength of 780 nm) suitable for CD is emitted from the laser diode.

  The laser light emitted from the laser device 14 is separated into 0th order light, + 1st order light, and −1st order light by the diffraction grating 16 and reflected by the half mirror 22, and then the quarter wavelength plate 24 and the collimator lens 26. Is reflected by a rising mirror (not shown) and focused on the information recording layer of the optical disc by the objective lens 40. Then, the return laser beam reflected by the information recording layer of the optical disk passes through the rising mirror, the collimator lens 26, the quarter wavelength plate 24, and the half mirror 22, and then detected by the photodetector 18 (PDIC). Is done. A control signal is supplied to the coil of the lens holder 32 based on the signal detected by the photodetector 18. As a result, focus control, tracking control, and radial tilt control are performed.

<Second Embodiment>
In the present embodiment, a configuration for suppressing intrusion of dust into the apparatus will be described with reference to FIGS. 2 to 5.

  The outline of this embodiment will be described with reference to FIG. FIG. 2A is a plan view of the state in which the optical pickup device operates within the optical disc device as viewed from above, and FIG. 2B is a cross-sectional view thereof.

  Referring to FIG. 2A, when reading or writing information on optical disc 20, optical pickup device 10 disposed below optical disc 20 rotated at a predetermined speed by a turntable. Then, laser light having a predetermined wavelength is irradiated.

  At this time, an optical flow (airflow 30) is generated by the optical disk 20 rotating at a high speed inside the housing. The direction of the airflow 30 is the same as the direction of rotation of the optical disc 20, and is clockwise on the paper. Here, since dust is present in the air inside the housing of the optical disk, the airflow 30 also includes dust (dust, cigarette smoke, etc.).

  With reference to FIG. 2B, a part of the above-described airflow 30 travels toward the optical pickup device 10. As described above, since the internal space of the optical pickup device 10 is not completely sealed, when the optical pickup device 10 is exposed to the airflow 30, dust contained in the airflow 30 enters the internal space of the optical pickup device 10. To do. Therefore, if no measures are taken, dust that has entered the optical pickup device 10 adheres to the optical element, which may deteriorate the characteristics of the optical pickup device 10.

  Therefore, in this embodiment, penetrating regions 42 and 44 penetrating a part of the optical pickup device 10 are provided so that the airflow 30 passes through the penetrating regions 42 and 44. As a result, most of the airflow 30 flowing toward the optical pickup device 10 flows through the through regions 42 and 44.

  Here, as shown in FIG. 4, the open portion of the housing 12 is closed by a cover 56. Although the housing 12 itself has unevenness and the flatness of the cover 56, etc., it cannot be completely sealed, but the gap is relatively small. In this state, as shown in FIG. 2 (B), since a region that actively penetrates from the cover to the bottom of the housing is provided, the dust that tries to enter the gap is reduced from the amount of resistance that the air current enters to the penetration region. The tendency which flows toward 44 is shown.

  Therefore, even if there is a minute opening in the other part of the optical pickup device 10 that allows the inside and outside of the optical pickup device 10 to communicate with each other, the amount of the airflow 30 that enters the inside of the device from this opening is reduced. . Accordingly, the amount of dust entering the inside of the optical pickup device 10 under use conditions is reduced.

  In this embodiment, an element arrangement region 46 is provided near the center of the optical pickup device 10, and the through regions 42 and 44 are provided at positions sandwiching the element arrangement region 46. Here, the element arrangement region 46 is a region where the diffraction grating 16, the half mirror 22, the quarter wavelength plate 24, the collimator lens 26, and the like shown in FIG. 1 are arranged.

  In other words, the element that is optically affected by the dust is provided in the center of the housing 12 as much as possible. And if it demonstrates in FIG. 4, the components which do not influence dust will be arrange | positioned in the circumference | surroundings. Therefore, the housing area where the motor 76 is installed, the housing area where the wiring board 53 extends, the vicinity of the insertion portion 36, and the vicinity of the engaging portion are suitable as the installation location of the penetration region. In FIG. 4B, since the wiring board 53 is placed flat with respect to the bottom of the housing 12, a through-hole that is blocked by the flexible sheet is not preferable.

  In the structure of FIG. 2, the airflow 30 almost uniformly flows from the vicinity of both ends of the optical pickup device 10 to the optical disc 20 side, so that the airflow 30 entering the central element arrangement region 46 is sucked out from both sides. Therefore, the effect which suppresses the penetration | invasion of dust becomes large.

  A specific configuration of the optical pickup device 10 will be described with reference to FIG. In the optical pickup device 10, an objective lens driving device 28 and a circuit board 50 are provided on the upper surface (bottom surface) of the housing 12 in which the optical element is built.

  As described above, in the objective lens driving device 28, the lens holder 32 that holds the objective lens 40 is movably held. Further, the objective lens driving device 28 is covered with a cover 38 except for a portion where the lens holder 32 is exposed. Here, the cover 38 is formed by bending a thin metal plate made of stainless steel or the like into a predetermined shape. An opening 39 that opens a part of the cover 38 is provided, and this opening 39 constitutes a part of the above-described through region 42. As will be described later with reference to FIG. 5B, a through portion 55 that penetrates the housing 12 is provided below the opening 58, thereby forming a through region that penetrates the entire apparatus.

  Here, the housing 12 forms a BOX having an outer shape indicated by a solid line as a bottom surface, facing toward the back side with respect to the paper surface, a side wall extending from the outer shape, and an open portion on the back side. The bottom surface and the side wall form a mounting area, and the bottom surface or the side wall and the partition wall extending from the bottom surface or the side wall constitute a mounting area for an optical element, a motor, or the like.

  Further, an insertion portion 36 and an engagement portion 34 are provided at the left and right ends of the housing 12 on the paper surface. Flat surfaces 48 </ b> A and 48 </ b> B are provided at the upper ends of both ends of the insertion portion 36, and flat surfaces 48 </ b> C are provided at the upper portion of the engaging portion 34. These flat surfaces are used for checking the position and adjusting the position of an optical element such as a half mirror built in the housing 12. Specifically, the flat surfaces 48A, 48B, and 48C are brought into contact with the reference surface of the adjustment jig, thereby positioning the housing 12 when performing position confirmation.

  A circuit board 50 made of an insulating substrate such as glass epoxy is disposed on the upper surface of the housing 12. Although not shown, circuit elements such as chip resistors and chip capacitors, connectors used for connection to the outside, and the like are disposed on the upper surface of the circuit board 50.

  A through portion 54 is provided through a part of the upper surface (bottom surface) of the housing 12, and the wiring board 52 is disposed from the inner space of the housing 12 to the upper surface of the housing 12 via the through portion 54. Yes. The wiring board 52 is a thin board having flexibility such as a flexible sheet. One end of the wiring board 52 is connected to a motor built in the housing, and the other end is connected to the circuit board 50. The wiring board 53 is not placed flat as shown in FIG. 4B, but is provided so as to be close to one side surface in the through portion 54. In FIG. 3, since it arrange | positions close to the side wall which can see a surface, a fixed space is arrange | positioned between an opposing side surface and a flexible sheet. In this embodiment, the penetrating portion 54 also functions as a path through which the airflow is released through the housing 12, and this matter will be described later with reference to FIG.

  Further, the optical pickup device 10 having the above-described configuration is housed in a housing to constitute an optical disc device. Inside the optical disk device, a guide shaft is engaged with the engaging portion 34, another guide shaft is engaged with the insertion portion 36, and the optical pickup device 10 moves along these guide shafts, so that Read or write information.

  FIG. 4A is a perspective view showing a state in which the optical pickup device 10 shown in FIG. 3 is rotated 180 degrees from the right side to the left side and reversed upside down. FIG. 4B is a perspective view showing the optical pickup device with the cover 56 removed in that state.

  With reference to FIG. 4A, the open portion of the back surface of the housing 12 is covered with a cover 56. The cover 56 is formed, for example, by bending a metal plate such as stainless steel or iron having a thickness of about 0.4 mm into a predetermined shape, and is provided in the housing 12 by fastening means such as screws. Most of the elements provided in the housing 12 are covered with a cover 56. On the other hand, the laser device 14 and the photodetector 18 are provided on the side wall of the housing 12 from the outside without being covered with the cover 56.

  In this embodiment, a part of the cover 56 is removed to provide openings 58 and 60. The openings 58 and 60 function as a flow path through which the airflow passes.

  The opening 58 is a portion of the slit from which the cover 56 is partially removed. With reference to FIG. 4B, the opening 58 is provided at a position overlapping with a through-hole 55 described later in plan view.

  The opening 60 is a part where a part of the cover 56 is cut out. Specifically, most of the outer peripheral portion of the cover 56 is in contact with the side wall of the housing 12. A part of the periphery of the cover 56 is cut away to provide an opening 60, and the internal space of the housing 12 communicates with the outside through the opening 60. That is, the opening 60 is provided as a gap between the cover 56 and the side wall of the housing 12.

  Further, a projecting region 80 in which a part of the cover 56 is partially projected outward is provided, and slits 82 </ b> A and 82 </ b> B are arranged along the projecting region 80. This matter will be described later with reference to FIG.

  Referring to FIG. 4B, the housing 12 of this embodiment is a region surrounded by a bottom portion (bottom surface) 62 having an outer shape, a side wall 64 projecting in the thickness direction from the outer peripheral edge of the bottom portion, and a side wall 64. It has the partition wall 66 which protrudes from the bottom part 62 or the side wall 64 in the thickness direction. The optical element described above is arranged in a region surrounded by the side wall 64.

  In this embodiment, a penetrating portion 55 that penetrates the bottom portion 62 of the housing 12 is provided. Specifically, a through portion 55 is provided in the bottom portion 62 near the outside of the partition wall 66. The through portion 55 mainly has two functions.

  The first function of the penetrating portion 55 is a passage through which the wiring board 53 passes from the lower side to the upper side on the paper surface. Specifically, one end of the wiring board 53 is connected to the objective lens driving device 28 shown in FIG. 3 and the other end is connected to the circuit board 50.

  The second function of the penetrating portion 55 is an airflow passage. Specifically, the penetrating portion 55 that penetrates the bottom portion 62 of the housing 12 is disposed so as to overlap with the opening 58 shown in FIG. Therefore, the airflow flowing in the thickness direction through the optical pickup device 10 passes through the penetrating region composed of the penetrating portion 55 and the opening 58. Thereby, as described above, the airflow entering the element arrangement region 46 is reduced, and the dustproofness is improved.

  In this embodiment, the region where the penetrating portion 55 is provided is partitioned from the element placement region 46 by a partition wall 66. Specifically, with reference to FIG. 4B, a partition wall 66 is provided in the immediate vicinity of the penetrating portion 55, whereby the collimator lens 26 and the like are disposed in the region where the penetrating portion 55 is provided. It is partitioned from an element arrangement region 46. Therefore, even if an air flow including dust enters the inside of the optical pickup device 10 from the penetration portion 55, the entered air flow enters only the region where the penetration portion 55 is provided, and does not enter the element arrangement region 46. Therefore, when the air current enters from the penetrating portion 55, the optical element is not adversely affected by the dust.

  In addition, although not shown, another penetrating portion that partially penetrates the bottom 62 is provided at a position overlapping the opening 60 shown in FIG. The bottom portion is provided with a wiring board 53 connected to the motor 76, and further functions as a through region through which airflow passes. This matter will be described later with reference to FIG.

  Here, in the drawing, the partition wall 66 described above is not provided between the region where the penetrating portion is provided near the motor 76 and the region where the optical element is arranged. Further, a part such as a guide shaft for moving the collimator lens may be disposed between the regions, and the part may be used as a partition wall.

  With reference to FIG. 5, the above-described through portion and the like will be further described. 5A is a perspective view showing the optical pickup device 10, FIG. 5B is a cross-sectional view taken along the line BB ′ of FIG. 5A, and FIG. It is sectional drawing in the CC 'line | wire of A).

  With reference to FIG. 5 (B), the opening 58 provided in the cover 56, the penetration part 55 provided in the bottom part of the housing 12, and the opening 39 provided in the cover 38 are provided correspondingly. Thus, a penetrating region 42 that allows airflow to pass in the thickness direction of the optical pickup device 10 is formed.

  Here, the opening part 58, the penetration part 55, and the opening part 39 may be arrange | positioned so that at least one part may overlap in the thickness direction, and does not need to overlap. That is, the airflow that has entered from the opening 58 may pass through the through portion 55 and be released to the outside from the opening 39. In this figure, the advancing direction of the air current is indicated by a white arrow.

  Further, as described above, the through portion 55 is also a path through which the wiring substrate 53 is routed. Specifically, one end of the wiring substrate 53 is electrically connected to the support substrate 78 of the objective lens driving device 28 disposed on the lower surface of the housing 12. The other end of the wiring board 53 is routed through the through portion 55 and connected to the circuit board 50 (see FIG. 5A). In addition, since there is a space between the wiring board 53 and the penetrating portion 55, the airflow passes through this space.

  Here, a partition wall 66 exists between the space into which the airflow flows and the element arrangement region 46. The partition wall 66 protrudes upward integrally with the bottom 62, and the upper end thereof is in contact with the cover 56. Therefore, since the space into which the airflow flows and the element arrangement region 46 are separated by the partition wall 66, the dust contained in the airflow does not flow into the element arrangement region 46.

  The above-described airflow also flows into the cover 38 in which the objective lens driving device 28 is built. However, since the airflow flowing into the cover 38 is immediately discharged to the outside from the opening 39, the adverse effect of dust contained in the airflow on the objective lens included in the objective lens driving device 28 is small.

  With reference to FIG.5 (C), the penetration part 44 which an airflow passes is provided by providing the opening part 60 of the cover 56, and the penetration part 54 of a housing correspondingly. Therefore, the airflow that has entered through the opening 60 enters the internal space of the housing 12, and then is released to the outside through the through portion 54.

  Further, in the present embodiment, the air inside the apparatus is warmed by the motor 76, but the warmed air is discharged to the outside via the penetrating region 44.

  Here, the penetrating portion 54 also functions as a path through which the wiring substrate 52 is routed. Specifically, one end of the wiring board 52 is connected to the motor 76, is routed to the outside of the housing 12 through the through portion 54, and the other end is connected to the circuit board 50. In addition, a motor 76 and a feed shaft 74 are disposed in a space where airflow enters from the opening 60, but these components are less affected by dust unlike optical components such as lenses.

  Furthermore, since a space is formed between the wiring board 52 and the through portion 54, the airflow passes through this space.

  In the above description, the two through regions 42 and 44 are arranged so as to sandwich the element arrangement region 46 where the optical element is arranged, but the number and position of the through regions may be arbitrary. That is, one or three or more through regions may be provided in the optical pickup device 10. Furthermore, a through region may be disposed near the center of the optical pickup device 10.

<Third Embodiment>
The optical pickup device 10 of the present embodiment is basically the same as that described above, and is characterized in that the cover 56 is provided with protruding regions and slits 82A and 82B.

  6A is a perspective view showing the optical pickup device 10, and FIG. 6B is a perspective view showing the optical pickup device with the cover 56 removed.

  With reference to FIG. 6A, a part of the cover 56 is protruded to the outside (front side with respect to the paper surface), and a quadrangular protruding region 80 is provided in plan view. Furthermore, slits 82 </ b> A and 82 </ b> B from which the cover 56 is removed are provided along the opposite sides of the protruding region 80.

  The protruding region 80 is provided corresponding to a region where an element having a relatively thickness among the elements incorporated in the housing 12 is disposed. In this embodiment, since the holder that holds the collimator lens is the thickest element, the protruding region 80 is provided corresponding to the range in which the holder moves.

  A mechanism for moving the collimator lens 26 will be described with reference to FIG. The collimator lens 26 is arranged so as to be movable along the optical path of the laser beam. Specifically, the collimator lens 26 is held by a holder 68. The guide shaft 70 engages with the holder 68, and the guide shaft 72 is inserted through the holder. The end of the holder 68 is in contact with the feed groove of the feed shaft 74, and the holder 68 moves along the guide shafts 70 and 72 when the feed shaft 74 is rotated by the motor 76.

  By providing the protruding region 80 according to this embodiment, the effect that the holder 68 does not contact the cover 56 can be obtained even if the entire optical pickup device 10 is thin. Furthermore, by providing the slits 82A and 82B, as will be described later, press working (drawing) for forming the protruding region 80 is possible. Furthermore, since the holder 68 can be visually recognized from the outside via the slits 82A and 82B, the position of the holder 68 can be confirmed.

  With reference to FIG. 7, the related structure of the protrusion area | region 80 and the holder 68 is demonstrated concretely. 7A is a perspective view showing the optical pickup device 10, FIG. 7B is a sectional view taken along line BB ′ of FIG. 7A, and FIG. 7C is FIG. Is a cross-sectional view taken along the line CC ′ of FIG.

  With reference to FIG. 7B, the projecting region 80 subjected to the press working projects upward from the other regions of the cover 56. That is, the upper surface of the protruding region 80 is disposed above the upper surface of the other region of the cover 56.

  Furthermore, in this embodiment, the drawing process is performed on the protruding region 80. Thereby, the thickness of the protrusion area | region 80 becomes thin. For example, the thickness of the protruding region 80 is 0.2 mm, and the thickness of the cover 56 in the other region is 0.4 mm. Thereby, the thickness of the space below the protrusion area | region 80 is ensured, and also the protrusion above the protrusion area | region 80 is suppressed. If the projecting region 80 is formed simply by pressing, the amount of projecting upward of the projecting region 80 becomes large, and the overall thickness of the optical pickup device 10 is hindered. In this embodiment, the thickness of the projecting region 80 is made thinner than the other regions of the cover 56 by drawing, thereby suppressing the projecting of the projecting region 80 and contributing to a reduction in thickness.

  In this embodiment, the holder 68 is disposed below the protruding region 80. Specifically, the holder 68 of the portion to which the collimator lens 26 is fixed is disposed below the protruding region 80. The upper end portion of the holder 68 is separated from the lower surface of the protruding region 80. Therefore, even if the holder 68 moves during use, the holder 68 does not come into contact with the protruding region 80 and the movement is not hindered.

  A portion of the holder 68 into which the guide shafts 70 and 72 are inserted or engaged is disposed on the side of the protruding region 80. Further, the vicinity of the left and right end portions of the holder 68 is exposed from the slits 82A and 82B, and this portion is visible from the outside.

  With reference to FIG. 7C, the protruding region 80 is provided over the entire movable region of the holder 68. That is, the width of the protruding region 80 is longer than the movable region of the holder 68. Therefore, even if the holder 68 moves along the guide shaft 72 under the usage condition, there is always a gap between the upper end of the holder 68 and the protruding region 80, so that it is obstructed by the cover 56. The holder 68 is movable.

  The configuration of the cover 56 will be further described with reference to FIG. FIG. 8A is a perspective view showing the cover 56 as a whole, and FIGS. 8B to 8G are views showing a method of forming the protruding region 80.

  Referring to FIG. 8A, the cover 56 is provided with the protruding region 80 and the slits 82A and 82B described above, and fixing holes 56A and 56B for screwing are provided near the ends. .

  The contact portion 56C is a part that abuts on the laser device 14 shown in FIG. Thereby, the heat generated by the laser device 14 emitting laser light is conducted to the cover 56 and then radiated to the external atmosphere. That is, the cover 56 of the present embodiment covers the element arrangement region of the housing 12 and has a dustproof function, and also functions as a heat sink that contributes to heat dissipation.

  A method for forming the protruding region 80 will be described below. Here, FIGS. 8B, 8D, and 8F are plan views showing each step, and FIGS. 8C, 8E, and 8G are cross-sectional views. It is.

  Referring to FIGS. 8B and 8C, first, slits 82A and 82B are formed by partially punching cover 56 by pressing. As described above, the slits 82 </ b> A and 82 </ b> B are formed to be parallel to each other so as to sandwich the quadrangular protruding region 80.

  Next, referring to FIG. 8D and FIG. 5E, a drawing process (press process) is performed on the protruding region 80. By this step, the protruding region 80 is disposed above the other regions. Further, since the drawing process is also performed in this step, the protruding region 80 is crushed in the thickness direction and becomes thinner than other regions. Specifically, the protruding region 80 has a thickness of about 0.2 mm, and the other regions have a thickness of about 0.4 mm.

  With reference to FIG. 8D, since the drawing process is performed on the protruding region 80 in this step, the side of the protruding region 80 spreads sideways. In FIG. 8E, this widened portion is shown as a surplus portion 84. The slits 82A and 82B function as regions for allowing the surplus portion 84 to escape laterally by drawing. If the surplus portion 84 is present, the appearance of the optical pickup device is deteriorated, so the surplus portion 84 is removed by press working.

  FIG. 8F and FIG. 8G show the protruding region 80 after the above-described surplus portion 84 is removed. Since the protruding region 80 protrudes upward and is thinned by the above process, a space below the protruding region 80 is widely secured while suppressing the upward protrusion of the protruding region 80.

  In this embodiment, the protruding region 80 described above is provided corresponding to the collimator moving mechanism having a thickness. In addition, the protruding region 80 is not simply a portion that is protruded by press working, but is formed by drawing that is thinner than other regions. Therefore, an increase in the overall thickness of the optical pickup device 10 can be suppressed, and the collimator moving mechanism can be accommodated inside the device. Further, by providing the groove-like slits 82A and 82B on the side of the protruding region 80, the protruding region 80 can be formed by drawing. Furthermore, the holder for holding the collimator lens can be visually confirmed from the outside via the slits 82A and 82B to confirm the position.

  Here, in the present embodiment, the above-described protruding region 80 is provided corresponding to the place where the holder for holding the collimator lens is arranged, but the protruding region 80 may be provided at a place where another optical element is arranged. Is possible.

<Fourth embodiment>
In the present embodiment, a configuration for housing a motor in a thin housing will be described with reference to FIG.

  FIG. 9A is a perspective view showing the portion of the optical pickup device 10 where the motor 76 is disposed, and FIG. 9B is a cross-sectional view taken along the line B-B ′ of FIG. FIG. 9C is a cross-sectional view taken along line C-C ′ of FIG.

  Referring to FIG. 9A, the housing 12 houses a motor 76 for moving the collimator lens. Further, most of the open portion of the housing 12 is covered with a metal cover 56, but an opening 60 is provided by cutting out a part of the housing 12, and a part of the motor 76 is exposed to the outside from the opening 60. Exposed.

  Further, a thin portion 56D in which the cover 56 is partially thinned is provided corresponding to the place where the motor 76 is disposed.

  Referring to FIG. 9B, the thin portion 56D is a portion where the cover 56 is partially thinned from below, and the thickness of the thin portion 56D is, for example, about 0.2 mm. Less than half. Further, the upper surface of the thin portion 56 </ b> D is disposed on the same plane as the upper surfaces of other areas of the cover 56. Therefore, there is no increase in thickness due to the provision of the thin portion 56D.

  Further, the width of the thin portion 56 </ b> D may be approximately the same as the width of the motor 76 or may be narrower than the width of the motor 76. Since the cross-sectional shape of the motor 76 is circular, the upper end of the motor 76 can be separated from the cover 56 even if the width of the thin portion 56D is narrow. The upper end of the motor 76 may be in contact with the lower surface of the cover 56 or may be separated. By bringing the motor 76 into contact with the cover 56, the heat generated from the motor 76 is conducted to the cover 56 and is radiated well to the outside. Further, by separating the cover 56 from the motor 76, the motor 76 can be reliably accommodated in the housing 12 even if the outer shape of the motor 76 includes a certain degree of tolerance.

  Referring to FIG. 9C, a through portion 54 is provided corresponding to the opening 60, and a through region 44 is formed by these. Then, the airflow passes through the through region 44 from above to below on the paper surface. Therefore, even if the motor 76 generates heat during operation, the motor 76 is cooled by the airflow, thereby suppressing overheating.

  Here, referring to FIG. 9A, the cover 56 that overlaps the motor 76 may be removed to expose the motor 76 to the outside. Thereby, the heat dissipation effect of the motor 76 is further improved. That is, instead of the thin portion 56D, the cover 56 from which this portion is removed may be employed.

DESCRIPTION OF SYMBOLS 10 Optical pick-up apparatus 12 Housing 14 Laser apparatus 16 Diffraction grating 18 Optical detector 20 Optical disk 22 Half mirror 24 1/4 wavelength plate 26 Collimator lens 28 Objective lens drive apparatus 30 Air flow 32 Lens holder 34 Engagement part 36 Insertion part 38 Cover 39 Opening 40 Objective lens 42 Through region 44 Through region 46 Element placement region 48A, 48B, 48C Flat surface 50 Circuit board 52 Wiring board 53 Wiring board 54 Through part 55 Through part 56 Cover 56A Fixing hole 56B Fixing hole 56C Contacting part 56D Thin Part 58 opening part 60 opening part 62 bottom part 64 side wall 66 partition wall 68 holder 70 guide shaft 72 guide shaft 74 feed shaft 76 motor 78 support substrate 80 projecting region 82A, 82B slit 84 surplus part

Claims (8)

A housing having a bottom, a side wall continuous from the periphery of the bottom, and an open portion facing the bottom;
A motor for moving an optical element housed in an arrangement region composed of the bottom and the side wall;
A cover that covers the open portion of the housing,
Exposing at least a portion of the motor from the cover;
An optical pickup device, characterized in that a thin portion is formed by thinning the cover from the inside at a portion overlapping with the motor.   The optical pickup device according to claim 1, wherein the arrangement region in which the motor is accommodated communicates with the outside through a through portion that penetrates the bottom portion.   The optical pickup device according to claim 1, wherein the motor is a motor that moves a collimator lens.   4. The main surface facing the outside of the cover in the region where the thin portion is provided is disposed on the same plane as the main surface of the other region. 5. Optical pickup device. A housing having a bottom, a side wall continuous from the periphery of the bottom, and an open portion facing the bottom;
A motor for moving an optical element housed in an arrangement region composed of the bottom and the side wall;
A cover that covers the open portion of the housing,
An optical pickup device, wherein at least a part of the motor is exposed from the cover.   The optical pickup device according to claim 5, wherein the arrangement region in which the motor is accommodated communicates with the outside through a through portion that penetrates the bottom portion.   The optical pickup device according to claim 5, wherein the motor is a motor that moves a collimator lens.   The main surface facing the outside of the cover in the region where the thin portion is provided is arranged on the same plane as the main surface of the other region. Optical pickup device.

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