JP4185844B2 - Optical disk device - Google Patents

Description

  The present invention relates to an optical disc apparatus capable of recording and reproducing information with respect to an optical disc as a recording medium.

  2. Description of the Related Art In recent years, optical disc apparatuses that read and reproduce optical discs as recording media with an optical pickup have been reduced in size, thickness, and performance. In particular, portable MDs using a mini disc (MD) as a portable optical disc apparatus. Players are generally popular.

Hereinafter, a conventional optical disc apparatus will be described using the portable MD player disclosed in Patent Document 1 as an example.
FIG. 10 is a cross-sectional view of a conventional portable MD player disclosed in Patent Document 1. In FIG. As shown in FIG. 10, the external appearance of the portable MD player is formed by an outer case 101 including an upper lid 101a that can be opened and closed and a lower case 101b that rotatably holds the upper lid 101a. 10A shows a state where the upper lid 101a opens the lower case 101b, and FIG. 10B shows a state where the upper lid 101a closes the lower case 101b.

  As shown in FIG. 10A, a mini-disc case (hereinafter referred to as an MD case) 102 in which the optical disc 100 is accommodated is mounted with the upper lid 101a opening the lower case 101b. Various information such as music information is recorded on the optical disc 100. A spindle motor 103 is disposed almost at the center of the lower case 101b, and a turntable 104 for placing and rotating the optical disc 100 in the MD case 102 is provided above the spindle motor 103. An optical pickup 105 that reads information on the optical disk 100 in the MD case 101 and a feed mechanism 106 that moves the optical pickup 105 in the diameter direction of the optical disk 100 are provided inside the lower case 101 b. Reference numeral 107 denotes a drive shaft which is a part of the feed mechanism 106, and the optical pickup 105 is screwed together. The drive shaft 107 is rotatably supported by a chassis (not shown) in the feed mechanism 106. By rotating the drive shaft 107, the optical pickup 105 screwed to the drive shaft 107 moves in the diameter direction of the optical disk. It is configured as follows.

  In the lower case 101b, a wiring board 108 on which electric parts and electric circuits necessary for reproducing the optical disc 100 in the MD case 102 are provided is provided below the feeding mechanism 106.

In the conventional portable MD player configured as described above, in order for the optical pickup 105 to read the information on the optical disc 100 with certainty, the relative distance between the optical pickup 105 and the optical disc 100 is within an allowable range. It is set.
JP 11-096747 A (page 2-3, FIG. 1)

  In the conventional portable optical disc apparatus configured as described above, as the size and thickness of the conventional optical disc apparatus are reduced, the feed mechanism 106 must be downsized, and the diameter of the drive shaft 107 must be reduced. If the diameter of the drive shaft 107 is reduced, the optical disk device is a portable device, and therefore the drive shaft 107 is easily bent due to the weight of the optical pickup due to vibration or dropping when the product is transported or carried by the user. As a result, the drive shaft 107 may be permanently deformed due to slight vibrations that occur when carrying the optical disk device or shocks when it is accidentally dropped. If the drive shaft 107 is permanently deformed, the relative distance between the optical pickup 105 and the optical disc 100 may be out of the allowable range, and information on the optical disc may not be read accurately. Therefore, there has been a limit to reducing the size and thickness of the device by reducing the diameter of the drive shaft in the disk device.

  In the present invention, even if the diameter of the drive shaft of the feed mechanism is made thin, the drive shaft for driving the optical pickup is permanently deformed due to vibration or impact during dropping when the optical disk device is transported or carried by the user. It is an object of the present invention to provide an optical disc apparatus that is configured so as to prevent the occurrence of downsizing and thinning.

In order to achieve the above object, an optical disk apparatus according to the present invention comprises, as described in claim 1, disk drive means for mounting and rotating the optical disk,
An optical pickup unit for recording or reproducing an optical disk placed on the disk drive means;
A feed mechanism having a drive shaft for driving the optical pickup unit in a radial direction of an optical disk placed on the disk drive means, and a predetermined distance from the outer surface of the optical pickup unit, A support member having a fluctuation range during abnormal operation within the predetermined distance ,
The optical pickup portion includes an engaging portion that is formed on a chassis that rotatably supports the drive shaft and engages with a guide portion that guides a moving direction of the optical pickup portion, and a through-hole that is screwed with the drive shaft. A contact portion projecting in a direction perpendicular to the central axis of the drive shaft and parallel to the recording surface of the optical disk formed and placed in the vicinity of
The support member includes a facing surface of the guide portion that faces the optical pickup portion with a predetermined distance A on a surface parallel to a recording surface of the placed optical disc, and a recording surface of the placed optical disc. And a predetermined distance B with respect to the contact portion in a direction orthogonal to the central axis of the drive shaft and a predetermined distance with respect to the contact portion in a direction orthogonal to the recording surface of the optical disk placed thereon And at least a rib formed on the chassis with C,
The disposition distance of the support member from the outer surface of the optical pickup portion is set within the yield strength of the drive shaft. In the optical disk apparatus configured as described above, even if the diameter of the drive shaft of the feeding mechanism is made thin, the drive shaft may be permanently deformed by vibrations during product transportation or carrying of the optical disk apparatus or shocks when dropped. Therefore, the optical disk device can be reduced in size and thickness.

According to the optical disk apparatus of the present invention, as described in the second aspect , the rib of the support member according to the first aspect moves in the direction facing the recording surface of the optical disk placed in the optical pickup unit by a predetermined distance C. The wiring board is arranged with a predetermined distance D from the surface opposite to the surface facing the recording surface of the optical disk placed in the optical pickup unit. Even if the optical disk apparatus configured in this manner is formed with a narrow diameter of the drive shaft of the feed mechanism, the amount of deflection of the drive shaft when subjected to vibrations or shocks when dropped when the optical disk apparatus is transported or carried. Is regulated, the drive shaft is never permanently deformed.

According to the optical disk apparatus of the present invention, as described in the third aspect , the rib of the support member according to the first aspect moves in the direction facing the recording surface of the optical disk placed in the optical pickup unit by a predetermined distance C. The case that forms the external appearance of the apparatus is arranged with a predetermined distance D from the surface opposite to the recording surface of the optical disk placed in the optical pickup unit. Even if the optical disk apparatus configured in this manner is formed with a narrow diameter of the drive shaft of the feed mechanism, the amount of deflection of the drive shaft when subjected to vibrations or shocks when dropped when the optical disk apparatus is transported or carried. Is regulated, the drive shaft is never permanently deformed.

According to the optical disc apparatus of the present invention, as described in claim 4 , the contact portion and the engaging portion are formed in the vicinity of both ends in the optical pickup portion of claim 2 , and are parallel to the recording surface of the placed optical disc. The direction from the contact portion to the engagement portion in the direction orthogonal to the central axis of the drive shaft is the + X direction, the direction from the engagement portion to the contact portion is the −X direction, and the placement The direction to the mounted optical disk in the direction orthogonal to the recording surface of the optical disk is defined as + Z direction, and the direction opposite to the loaded optical disk is defined as -Z direction,
The opposing surface of the guide part defines the movement of the engaging part in the + X direction within a predetermined distance A,
The rib defines movement of the contact portion in the −X direction within a predetermined distance B, and defines movement of the contact portion in the + Z direction within a predetermined distance C.
The wiring board is configured to regulate the movement of the optical pickup portion in the −Z direction within a predetermined distance D. Even if the optical disk apparatus configured in this manner is formed with a narrow diameter of the drive shaft of the feed mechanism, the X-direction and the Z-direction are applied when vibration or impact is applied when the optical disk apparatus is transported or carried. Since the amount of bending of the drive shaft is restricted, the drive shaft is never permanently deformed.

As described in claim 5 , the optical disc device according to the present invention has a contact portion and an engaging portion formed in the vicinity of both ends in the optical pickup portion of claim 3 , and is parallel to the recording surface of the optical disc placed thereon. The direction from the contact portion to the engagement portion in the direction orthogonal to the central axis of the drive shaft is the + X direction, the direction from the engagement portion to the contact portion is the −X direction, and the placement The direction to the mounted optical disk in the direction orthogonal to the recording surface of the optical disk is defined as + Z direction, and the direction opposite to the loaded optical disk is defined as -Z direction,
The opposing surface of the guide part defines the movement of the engaging part in the + X direction within a predetermined distance A,
The rib defines movement of the contact portion in the −X direction within a predetermined distance B, and defines movement of the contact portion in the + Z direction within a predetermined distance C.
The case is configured to regulate the movement of the optical pickup portion in the −Z direction within a predetermined distance D. Even if the optical disk apparatus configured in this manner is formed with a narrow diameter of the drive shaft of the feed mechanism, the X-direction and the Z-direction are applied when vibration or impact is applied when the optical disk apparatus is transported or carried. Since the amount of bending of the drive shaft is restricted, the drive shaft is never permanently deformed.

As described in claim 6 , the optical disk device according to the present invention is the wiring board according to claim 2 , wherein the mounting component is provided on a surface other than the surface facing the optical pickup unit. The optical disk apparatus configured as described above is configured such that the optical pickup unit moves in a position where there is no mounting component on the wiring board, so that the apparatus can be reduced in size and thickness.

An optical disk apparatus according to the present invention, as described in claim 7, further comprising a wiring board according to claim 3, wherein the wiring substrate has a shape formed by cutting a position facing the optical pickup unit. In the optical disk apparatus configured in this way, the wiring board is not disposed at the position where the optical pickup unit moves, and the case that becomes the appearance of the apparatus becomes a part of the support member. Is planned.

According to the present invention, even if the diameter of the drive shaft of the feed mechanism is made thin, the drive shaft for driving the optical pickup unit due to vibration during product transportation or carrying of the optical disk device or impact upon dropping is permanent. It is possible to provide an optical disc apparatus that is not deformed and that is reduced in size and thickness.
According to the present invention, even if a vibration or an impact at the time of dropping is applied to the optical disk device and transmitted to the optical pickup unit, the amount of bending of the drive shaft that drives the optical pickup unit is restricted, so Deformation is prevented, and a highly reliable miniaturized and thin optical disk device can be provided.
According to the present invention, it is possible to realize a highly reliable and compact optical disc apparatus with a simple configuration.

  Hereinafter, preferred embodiments of an optical disk device according to the present invention will be described with reference to the accompanying drawings.

Embodiment 1
FIG. 1 is an exploded perspective view showing an optical disk apparatus according to Embodiment 1 of the present invention. FIG. 2 is a perspective view showing an optical pickup unit in the optical disc apparatus of the first embodiment, and FIG. 3 is a cross-sectional view of the optical disc apparatus of the first embodiment, showing the arrangement of main parts.

The optical disk apparatus according to the first embodiment is an apparatus for recording and reproducing an optical disk stored in a mini disk case (hereinafter referred to as an MD case), and is an apparatus that achieves miniaturization and thickness reduction as compared with the conventional optical disk apparatus described above. It is. In the optical disk apparatus according to the first embodiment, as will be described later, the feed mechanism for moving the optical pickup unit in the diameter direction of the optical disk is reduced in size and thickness, and the drive shaft in the feed mechanism is formed thin. In the optical disk apparatus according to the first embodiment, an apparatus having a recording / reproducing function will be described, but the present invention can also be applied to an optical disk apparatus having only a reproducing function.
In the following description of the first embodiment, the description will be made on the assumption that the optical disk is used in a state of being arranged in the horizontal direction. This is because the optical disk usage state in the optical disk apparatus of the first embodiment is in the horizontal direction. It is not specified and can be used in the vertical direction.

  As shown in the perspective view of FIG. 1, the optical disc apparatus of the first embodiment is provided with a turntable 3 for placing an optical disc 7 in the center of the chassis 1 and a spindle motor 2 for rotationally driving the turntable 3. Yes. A feed mechanism 4 is provided at the lower portion of the chassis 1, and the feed mechanism 4 can move the optical pickup unit 6 in the radial direction of the optical disk 7 by rotating a drive shaft 5 in which a screw groove is formed. It is configured. Both ends of the drive shaft 5 are supported by the chassis 1 in a rotatable state.

  In FIG. 1, the code | symbol 8 has shown MD case, The optical disk 7 is accommodated in it. A holder 9 that holds the MD case 8 is provided on the upper portion of the chassis 1, and an upper lid 10 is provided on the upper side thereof. A wiring board 11 having electric parts and electric circuits necessary for driving and controlling each function of the optical disc apparatus is provided at the lower part of the chassis 1, and a lower case 12 is provided below the wiring board 11. The mounting component on the upper side (chassis 1 side) of the wiring board 11 is not arranged at the position where the optical pickup unit 6 moves. Therefore, the optical pickup unit 6 is disposed close to the upper surface of the wiring board 11.

  As shown in FIG. 2, the optical pickup unit 6 includes a lens 6 a for outputting a laser for recording / reproducing with respect to the optical disk 7. In addition, two screw holes 6 b and 6 b that are screwed into the drive shaft 5 are formed in the optical pickup unit 6 that is driven by the rotation operation of the drive shaft 5. The optical pickup unit 6 is configured to move in the radial direction of the optical disk 7 placed on the turntable 3 by rotating the drive shaft 5 screwed into the screw holes 6b and 6b. Further, the optical pickup portion 6 is formed with convex portions 6c and 6c as contact portions projecting in the horizontal direction at the ends of the two protruding portions forming the screw holes 6b and 6b. Furthermore, a concave portion 6d as an engaging portion is formed at an end portion on a side opposite to the convex portions 6c and 6c with the lens 6a interposed between the driving shaft 5 and the driving shaft 5.

FIG. 3 is a cross-sectional view showing the arrangement of the optical pickup unit 6, the chassis 1, and the wiring board 11. 4 and 5 are enlarged views showing the positional relationship among the optical pickup unit 6, the chassis 1, and the wiring board 11. FIG.
As shown in FIGS. 3 and 4, the recess 6 d provided at one end of the optical pickup unit 6 is configured to sandwich the guide portion 1 a formed linearly in the chassis 1 without a gap. . The guide portion 1 a guides the moving direction of the optical pickup portion 6 and extends in the radial direction of the optical disc 7 on the turntable 3.
Further, as shown in FIGS. 3 and 5, ribs 1b formed on the chassis 1 in a straight line are disposed above the two convex portions 6c, 6c of the optical pickup unit 6 with a predetermined interval. ing. Further, a wiring board 11 is disposed below the optical pickup unit 6 with a predetermined interval.

  As described above, in the optical disc device of the first embodiment, the drive shaft 5 is screwed into the screw holes 6b, 6b of the optical pickup unit 6 to drive the optical pickup unit 6 and the outer surface of the optical pickup unit 6 The rib 1b of the chassis 1 and the support member of the wiring board 11 are disposed at a predetermined distance from the front. Further, the recess 6d provided at one end of the optical pickup unit 6 is configured to be sandwiched between the guide unit 1a formed in the chassis 1 without any gap in the vertical direction. However, in the engagement between the concave portion 6d and the guide portion 1a, the opposing surface 1c of the guide portion 1a and the concave portion 6d have a predetermined interval in the horizontal direction, and the opposing surface 1c of the guide portion 1a serves as a support member. Yes. In the first embodiment, the guide portion 1a, the rib 1b, and the wiring board 11 are support members.

4 and 5, the center of the drive shaft 5 is the reference point of the optical pickup unit 6, and the X direction (the direction perpendicular to the moving direction of the optical pickup unit 6 in the horizontal plane in FIG. 4) and the Z direction (in FIG. 4). The direction perpendicular to the horizontal plane) is shown, and the distance from the outer surface of the optical pickup unit 6 to each support member is shown.
4 and 5, the horizontal gap between the optical pickup section 6 and the facing surface 1c of the guide section 1a of the chassis 1 is indicated by the symbol “A”, and this gap A is defined as a gap in the + X direction. A horizontal gap between the optical pickup unit 6 and the rib 1b of the chassis 1 is indicated by a symbol “B”, and this gap B is defined as a gap in the −X direction. A vertical gap between the optical pickup unit 6 and the rib 1b of the chassis 1 is indicated by a symbol “C”, and this gap C is defined as a gap in the + Z direction. Further, a gap between the optical pickup unit 6 and the upper surface of the wiring board 11 is indicated by a symbol “D”, and this gap D is defined as a gap in the −Z direction.

Hereinafter, actual dimensions and materials in the optical disk apparatus according to Embodiment 1 will be described.
The diameter of the drive shaft 5 is 1.3 mm, and the material is SUS420. The weight of the optical pickup unit 6 is about 3 grams. The gap A in the + X direction between the optical pickup unit 6 and the chassis 1 is about 0.2 mm, the gap B in the −X direction is about 0.2 mm, and the gap C in the + Z direction is about 0.2 mm. The direction gap D is set to about 0.4 mm.
The yield strength of the drive shaft 5 was measured by measuring the drive shaft 5 as a single product, supporting both ends of the drive shaft 5 and pressing the center. As a result, the drive shaft 5 of the first embodiment was permanently deformed with a deflection amount of 1 mm and a pressing force of 10 N (= 1 kg). This numerical value is the so-called yield strength of the drive shaft 5.

  During the transportation of the optical disk apparatus according to the first embodiment configured as described above after shipment, vibration or impact may be applied to the optical disk apparatus that is the product. Even when the user is in use, since the optical disc apparatus of Embodiment 1 is portable, there is a case where the product is dropped and given an impact due to vibration caused by carrying or careless handling. When these vibrations and impacts are applied to the optical disk device as a product, a force represented by (weight of parts) × (impact gravity acceleration value) is applied to each component. For example, when a product is actually dropped from a height of 1 m, an impact gravity acceleration value of about 1000 G is generated. When this impact force is applied to the optical pickup unit 6 (weight: 3 grams) in the optical disc apparatus of the first embodiment, the force required by the following equation (1) is generated.

0.003 (Kg) × 1000 (G) = 3 (Kg · G) = 30 (N: Newton)
----- (1)

  In such a conventional optical disk apparatus, when such an impact force is applied to the optical pickup, the optical pickup is supported by the drive shaft, so that the impact force is directly transmitted to the drive shaft and the drive shaft 5 is bent and permanently deformed. Had. Since the yield strength of the single drive shaft 5 used in the first embodiment is 10 N, if the impact force of 30 N described above is applied to the drive shaft as it is, it will receive an impact force that is three times the yield strength. Definitely permanently deformed. The amount of deflection of the drive shaft at that time was about 3 mm according to experiments.

  However, in the configuration of the optical disc apparatus of the first embodiment, when an impact force is applied to the optical pickup unit 6, the optical pickup unit 6 moves due to the impact force, and the optical pickup unit 6 has a predetermined distance around it. It abuts on the support member arranged in this way. Therefore, the optical pickup unit 6 does not move greatly, and the drive shaft 5 does not deform until it is permanently deformed.

  More specifically, when an impact force is applied to the optical pickup unit 6 and the optical pickup unit 6 moves in the + X direction, the concave portion 6d moves a distance of 0.2 mm and contacts the opposing surface 1c of the guide unit 1a of the chassis 1. Touch. On the other hand, when the optical pickup unit 6 moves in the −X direction, the convex portion 6 c moves a distance of 0.2 mm and comes into contact with the rib 1 b of the chassis 1. Further, when the optical pickup portion 6 moves in the + Z direction, the convex portion 6c moves a distance of 0.2 mm and comes into contact with the rib 1b of the chassis 1. On the contrary, when the optical pickup unit 6 moves in the −Z direction, the lower surface of the optical pickup unit 6 moves a distance of 0.4 mm and comes into contact with the upper surface of the wiring board 11. In the configuration of the optical disk apparatus according to the first embodiment, the amount of movement of the optical pickup unit 6 and the amount of bending of the drive shaft 5 are configured to be approximately equal.

  As described above, in the optical disk apparatus according to the first embodiment, even if an impact due to vibration or dropping is applied, the amount of bending of the drive shaft 5 that occurs at that time is restricted to 0.2 to 0.4 mm. Therefore, the drive shaft 5 is suppressed to less than half of the amount of permanent deformation (= 1 mm), and the permanent deformation is reliably prevented.

<< Embodiment 2 >>
Hereinafter, an optical disk device according to a second embodiment of the present invention will be described with reference to FIGS. FIG. 6 is an exploded perspective view showing the optical disk apparatus according to the second embodiment. FIG. 7 is a cross-sectional view showing the arrangement of the optical pickup unit 6, the chassis 1, and the wiring board 13 in the optical disc apparatus according to the second embodiment. 8 and 9 are enlarged views showing the positional relationship among the optical pickup unit 6, the chassis 1 and the lower case 14 in the second embodiment.

In the description of the optical disk device according to the second embodiment of the present invention, parts having the same functions and configurations as those of the first embodiment are given the same numbers, and the description thereof is omitted. The optical disk apparatus according to the second embodiment is an apparatus that is further reduced in size and thickness as compared with the optical disk apparatus according to the first embodiment. In the optical disk apparatus according to the second embodiment, an apparatus having a recording / reproducing function will be described, but the present invention can also be applied to an optical disk apparatus having only a reproducing function.
In the following description of the second embodiment, the description will be made on the assumption that the optical disk is used in a state where it is arranged in the horizontal direction. This is because the optical disk in the optical disk apparatus of the second embodiment is used in the horizontal direction. It is not specified and can be used in the vertical direction.

  The optical disc apparatus according to the second embodiment is different from the configuration of the optical disc apparatus according to the first embodiment in the shapes of the wiring board 13 and the lower case 14. The wiring board 13 in the optical disk apparatus according to the second embodiment has an L shape in which a portion corresponding to the position where the optical pickup unit 6 is disposed is cut out. In addition, the mounting components on the wiring board 13 are disposed only on the upper side (chassis 1 side). Since there is no mounting component on the lower side (lower case 14 side) of the wiring board 13, the wiring board 13 is disposed in the vicinity of the lower case 14.

  In the optical disk device according to the second embodiment, the wiring substrate 13 is not disposed below the optical pickup unit 6, and the lower surface of the optical pickup unit 6 and the lower surface of the wiring substrate 13 are disposed substantially on the same plane. It is comprised so that. In addition, since the wiring board 13 is disposed close to the lower case 14, the optical disc of the second embodiment has a distance between the optical pickup unit 6 and the lower case 14 as compared with the optical disc apparatus of the first embodiment. It has a short and thin shape.

The optical pickup unit 6 in the optical disc device of the second embodiment has the same shape and configuration as the optical pickup unit 6 in the optical disc device of the first embodiment.
As shown in FIGS. 7 to 9, the optical pickup portion 6 driven by the rotation of the drive shaft 5 has a recess 6d as an engaging portion formed at one end thereof, and at the other end. Convex portions 6c and 6c, which are two abutting portions, are formed. The recess 6d is configured to sandwich the guide portion 1a formed in the chassis 1 without a gap. Above the two protrusions 6c, 6c, ribs 1b formed in a straight line on the chassis 1 are disposed with a predetermined interval. Further, a lower case 14 is disposed below the optical pickup unit 6 with a predetermined interval.

  As described above, in the optical disc device according to the second embodiment, the drive shaft 5 is screwed into the screw holes 6b and 6b of the optical pickup unit 6 to drive the optical pickup unit 6 and the outer surface of the optical pickup unit 6 The rib 1b of the chassis 1 and the support member of the wiring board 11 are disposed at a predetermined distance from the front. Further, the recess 6d provided at one end of the optical pickup unit 6 is configured to be sandwiched between the guide unit 1a formed in the chassis 1 without any gap in the vertical direction. However, in the engagement between the recess 6d and the guide portion 1a, there is a predetermined interval between the facing surface 1c of the guide portion 1a and the recess 6d in the horizontal direction, and the facing surface of the guide portion 1a serves as a support member. ing. In the second embodiment, the guide portion 1a, the rib 1b, and the lower case 14 are support portions.

  7 to 9, the center of the drive shaft 5 is the reference point of the optical pickup unit 6, and the X direction (the direction perpendicular to the moving direction of the optical pickup unit 6 in the horizontal plane in FIG. 7) and the Z direction (in FIG. 7). The direction perpendicular to the horizontal plane) is shown, and the distance from the outer surface of the optical pickup unit 6 to each support member is shown.

  8 and 9, the horizontal gap between the optical pickup section 6 and the facing surface 1c of the guide section 1a of the chassis 1 is indicated by a symbol “A”, and this gap A is defined as a gap in the + X direction. A horizontal gap between the optical pickup unit 6 and the rib 1b of the chassis 1 is indicated by a symbol “B”, and this gap B is defined as a gap in the −X direction. A vertical gap between the optical pickup unit 6 and the rib 1b of the chassis 1 is indicated by a symbol “C”, and this gap C is defined as a gap in the + Z direction. Furthermore, a gap between the optical pickup unit 6 and the upper surface of the lower case 14 is indicated by a symbol “E”, and this gap E is defined as a gap in the −Z direction.

Hereinafter, actual dimensions and materials in the optical disk apparatus according to Embodiment 2 will be described.
The drive shaft 5 has the same configuration as that of the first embodiment, has a diameter of 1.3 mm, and is made of SUS420. The weight of the optical pickup unit 6 is about 3 grams. The gap A in the + X direction between the optical pickup unit 6 and the chassis 1 is about 0.2 mm, the gap B in the −X direction is about 0.2 mm, and the gap C in the + Z direction is about 0.2 mm. The direction gap D is set to about 0.5 mm.
Since the proof stress of the drive shaft 5 is the same as that in the first embodiment, the deflection amount is 1 mm and the pressing force is 10 N (= 1 kg).

If vibration or impact is applied to the optical disk device, which is the product, during the transportation of the optical disk device according to Embodiment 2 configured as described above during shipment, each component will have (weight of component) × (impact). The force indicated by the gravity acceleration value) is applied.
However, in the configuration of the optical disk device of the second embodiment, when an impact force is applied to the optical pickup unit 6, the optical pickup unit 6 moves due to the impact force, and the optical pickup unit 6 has a predetermined distance around it. It abuts on the support member arranged in this way. Therefore, the optical pickup unit 6 does not move greatly, and the drive shaft 5 does not deform until it is permanently deformed.

More specifically, when an impact force is applied to the optical pickup unit 6 and the optical pickup unit 6 moves in the + X direction, the concave portion 6d moves a distance of 0.2 mm and contacts the opposing surface 1c of the guide unit 1a of the chassis 1. Touch. On the contrary, when the optical pickup unit 6 moves in the −X direction, the convex portion 6 c moves a distance of 0.2 mm and comes into contact with the rib 1 b of the chassis 1. Further, when the optical pickup portion 6 moves in the + Z direction, the convex portion 6c moves a distance of 0.2 mm and comes into contact with the rib 1b of the chassis 1. Conversely, when the optical pickup unit 6 moves in the −Z direction, the lower surface of the optical pickup unit 6 moves a distance of 0.5 mm and comes into contact with the upper surface of the lower case 14. In the configuration of the optical disk apparatus according to the second embodiment, the amount of movement of the optical pickup unit 6 and the amount of bending of the drive shaft 5 are substantially equal.
As described above, in the optical disk apparatus according to the second embodiment, even if an impact due to vibration or dropping is applied, the amount of bending of the drive shaft 5 that occurs at that time is restricted between 0.2 and 0.5 mm. Therefore, the drive shaft 5 is suppressed to less than half of the amount of permanent deformation (= 1 mm), and the permanent deformation is reliably prevented.

  In the optical disk apparatus according to the first and second embodiments, the dimensions of the gaps A, B, and C between the optical pickup unit and the support member are set to 0.2 mm, and the gap D is set to 0.4 mm. However, the gap in the optical disk apparatus of the present invention is not limited to these values, and the proof stress determined by the dimensions and material of the drive shaft. It suffices if it is set within the range of.

  In the optical disc apparatus according to the present invention, in order to reduce the size and thickness of the feed mechanism for moving the optical pickup unit in the diameter direction of the optical disc placed on the turntable, the drive shaft in the feed mechanism is formed thin. ing. However, in the optical disk apparatus according to the present invention, since a support member for preventing the optical pickup unit from moving significantly is provided, the product may be subjected to vibration or impact caused by dropping during product transportation or operation. Even if it is added, the thin drive shaft is not deformed, and it becomes possible to realize an optical disc apparatus that is reduced in size and thickness.

  The optical disk apparatus according to the present invention is useful for an apparatus for achieving downsizing and thinning of a feeding mechanism for moving an optical pickup unit in the diameter direction of an optical disk placed on a turntable.

1 is an exploded perspective view showing an optical disc apparatus according to Embodiment 1 of the present invention. It is a perspective view which shows the optical pick-up part in the optical disk apparatus of Embodiment 1 which concerns on this invention. It is sectional drawing which shows arrangement | positioning of the principal part in the optical disk apparatus of Embodiment 1 which concerns on this invention. FIG. 3 is an enlarged cross-sectional view showing the vicinity of the optical pickup unit in the optical disc apparatus according to the first embodiment of the present invention. FIG. 3 is an enlarged cross-sectional view showing the vicinity of the optical pickup unit in the optical disc apparatus according to the first embodiment of the present invention. It is a disassembled perspective view which shows the optical disk apparatus of Embodiment 2 which concerns on this invention. It is sectional drawing which shows arrangement | positioning of the principal part in the optical disk apparatus of Embodiment 2 which concerns on this invention. It is sectional drawing which expanded and showed the vicinity of the optical pick-up part in the optical disk apparatus of Embodiment 2 which concerns on this invention. It is sectional drawing which expanded and showed the vicinity of the optical pick-up part in the optical disk apparatus of Embodiment 2 which concerns on this invention. It is sectional drawing which shows the conventional optical disk apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Chassis 1a Guide part 1b Rib 2 Spindle motor 3 Turntable 4 Feed mechanism 5 Drive shaft 6 Optical pick-up part 6a Lens 6b Screw hole 6c Convex part 6d Concave part 7 Optical disk 8 Mini-disc case 9 Holder 10 Upper lid 11 Wiring board 12 Lower case 13 Wiring board 14 Lower case

Claims (7)

A disk drive means for rotating an optical disk mounted thereon;
An optical pickup unit for recording or reproducing an optical disk placed on the disk drive means;
A feed mechanism having a drive shaft for driving the optical pickup unit in a radial direction of an optical disk placed on the disk drive means, and a predetermined distance from the outer surface of the optical pickup unit, A support member having a fluctuation range during abnormal operation within the predetermined distance ,
The optical pickup unit includes an engaging portion that engages with a guide portion that is formed on a chassis that rotatably supports the drive shaft and guides a moving direction of the optical pickup portion, and a through-hole that is screwed with the drive shaft. A contact portion projecting in a direction perpendicular to the central axis of the drive shaft and parallel to the recording surface of the optical disk formed and placed in the vicinity of
The support member includes a facing surface of the guide portion that faces the optical pickup portion with a predetermined distance A on a surface parallel to a recording surface of the placed optical disc, and a recording surface of the placed optical disc. And a predetermined distance B with respect to the contact portion in a direction orthogonal to the central axis of the drive shaft and a predetermined distance with respect to the contact portion in a direction orthogonal to the recording surface of the optical disk placed thereon And at least a rib formed on the chassis with C,
An optical disc apparatus in which an arrangement distance from the outer surface of the optical pickup portion of the support member is set within a proof strength of a drive shaft . The rib of the support member regulates the movement in the direction opposite to the recording surface of the optical disk placed in the optical pickup portion within a predetermined distance C, and the wiring board records the optical disc placed in the optical pickup portion. The optical disk apparatus according to claim 1 , wherein the optical disk apparatus is disposed with a predetermined distance D from a surface opposite to the surface facing the surface. A case in which the rib of the support member defines movement within a predetermined distance C within the optical pickup unit in a direction opposite to the recording surface of the optical disk mounted thereon and forms the appearance of the apparatus is mounted on the optical pickup unit. 2. The optical disk apparatus according to claim 1 , wherein the optical disk apparatus is disposed with a predetermined distance D from a surface opposite to the surface facing the recording surface of the optical disk. In the optical pickup portion, an abutting portion and an engaging portion are formed in the vicinity of both ends, and from the abutting portion to the engaging portion in a direction parallel to the recording surface of the optical disk placed and perpendicular to the central axis of the drive shaft. Is the + X direction, the direction from the engagement portion to the contact portion is the -X direction, and the direction to the optical disc placed in the direction orthogonal to the recording surface of the optical disc placed is + Z Direction, the direction opposite to the placed optical disk as -Z direction,
The opposing surface of the guide part defines the movement of the engaging part in the + X direction within a predetermined distance A,
The rib defines movement of the contact portion in the −X direction within a predetermined distance B, and defines movement of the contact portion in the + Z direction within a predetermined distance C.
The optical disc apparatus according to claim 2 , wherein the wiring board is configured to regulate movement of the optical pickup unit in the −Z direction within a predetermined distance D. In the optical pickup portion, an abutting portion and an engaging portion are formed in the vicinity of both ends, and from the abutting portion to the engaging portion in a direction parallel to the recording surface of the optical disk placed and perpendicular to the central axis of the drive shaft. Is the + X direction, the direction from the engagement portion to the contact portion is the -X direction, and the direction to the optical disc placed in the direction orthogonal to the recording surface of the optical disc placed is + Z Direction, the direction opposite to the placed optical disk as -Z direction,
The opposing surface of the guide part defines the movement of the engaging part in the + X direction within a predetermined distance A,
The rib defines movement of the contact portion in the −X direction within a predetermined distance B, and defines movement of the contact portion in the + Z direction within a predetermined distance C.
The optical disk apparatus according to claim 3 , wherein the case is configured to regulate movement of the optical pickup unit in the −Z direction within a predetermined distance D. The optical disk apparatus according to claim 2 , wherein the mounting component is provided on the wiring board other than the surface facing the optical pickup unit. The optical disk apparatus according to claim 3 , further comprising a wiring board, wherein the wiring board has a shape in which a position facing the optical pickup unit is cut out.

Images