THIS APPLICATION IS A U.S. NATIONAL PHASE APPLICATION OF PCT INTERNATIONAL APPLICATION PCT/JP2007/070198.
The present invention relates to a disc device capable of achieving a slimming down of a tilt adjusting portion that can adjust an optical axis of a light beam emitted from an optical pickup in a direction perpendicular to an information recording face of a disc.
An optical pickup feeding device used in the disc device, or the like in the prior art is known.
As shown in
Patent Literature 1: JP-A-2003-208766 (
Problems that the Invention is to Solve
However, in the optical pickup feeding device in the prior art, in the tilt adjustment, not only the adjusting stepped screw must be adjusted on a basis of the turntable of the spindle motor but also the height adjusting screw of the guide shaft must be adjusted independently such that the optical pickup is positioned in parallel with the turntable at the same height as the lead screw as the driving guide shaft, and thereafter a tilt of the optical pickup in the tangential direction must be adjusted. Therefore, a total length of adjustment of the optical pickup in the radial direction and the tangential direction and a length in which the screws are put are needed as a length of the adjusting stepped screw and a length of the height adjusting screw respectively. As a result, a dimension in the vertical direction to the disc face is needed long, and thus it is difficult to slim down the disc device.
The present invention has been made to solve the problem in the prior art, and it is an object of the present invention to provide a disc device capable of achieving a slimming down of a tilt adjusting portion.
A disc device of the present invention, includes a disc turning portion having a turntable on which a disc is loaded thereon, and which turns the disc loaded on the turntable; an optical pickup which performs an information recording operation or an information reproducing operation by emitting a light beam onto the disc turned by the disc turning portion; an optical pickup guiding member which holds the optical pickup movably in a radial direction of the disc loaded on the disc turning portion; an optical pickup driving portion which moves the optical pickup; a frame which holds the optical pickup driving portion; and a tilt adjusting portion which adjusts an optical axis of the light beam emitted from the optical pickup in a direction perpendicular to the disc that is loaded on the disc turning portion; wherein the tilt adjusting portion has a turntable adjusting portion which adjusts a tilt of a disc loading face of the turntable and an optical pickup adjusting portion which adjusts a position of the frame.
According to this configuration, when the recording or reproducing operation of the disc is performed by holding the disc by the disc turning portion to turn the disc, and then emitting the light beam while moving the optical pickup along the optical pickup guiding member in the radial diameter of the disc by the optical pickup driving portion, the tilt adjusting portion for adjusting the light beam emitted from the optical pickup such that the optical axis is set perpendicularly to the disc is provided. Also, as the tilt adjusting portion, the turntable adjusting portion for adjusting a tilt of the disc loading face of the disc turning portion, and the optical pickup adjusting portion for adjusting the position of the frame that holds an optical pickup driving portion are provided. Therefore, a margin for adjustment of respective adjusting portions can be reduced, also a slimming down of the tilt adjusting portion can be achieved, and a compactification of the disc device can be achieved.
Also, in the disc device of the present invention, the optical pickup adjusting portion is arranged on an inner peripheral side of the disc in a radial direction or the disc and an outer peripheral side of the disc in the radial direction.
According to this configuration, the position of the frame can be adjusted on the center side and the outer peripheral side of the disc respectively. Therefore, it is possible to coincide the tilt adjusting direction of the frame with the tangential adjusting direction of the disc. As a result, the tilt adjustment can be carried out stably and easily.
Also, in the disc device of the present invention, the frame has a substantially U-shaped portion that holds the optical pickup driving portion at both end portions of the optical pickup driving portion in the radial direction of the disc.
According to this configuration, both end portions of the optical pickup driving portion are supported by the U-shaped portion of the frame. Therefore, even when the position of the frame is adjusted on the inner peripheral side or the outer peripheral side of the disc respectively, the relative position of both end portions of the optical pickup driving portion can be maintained.
Also, in the disc device of the present invention, the turntable adjusting portion has fixing portions provided at two locations and an adjusting portion provided at one location, and the fixing portions provided at two locations are arranged such that a straight line connecting centers of the fixing portions is positioned in a direction that intersects orthogonally with a moving direction of the optical pickup in recording and reproducing operations, and the adjusting portion provided at one location is arranged such that the adjusting portion is positioned away in the moving direction of the optical pickup in the recording and reproducing operations from the straight line connecting centers of the fixing portions at two locations.
According to this configuration, the tilt adjusting direction of the loading face of the disc turning portion on which the disc is put and the radial adjusting direction of the disc can be made to coincide to each other. Therefore, the tilt adjustment can be carried out stably and easily.
Also, in the disc device of the present invention, the optical pickup guiding member contacts the optical pickup and guides the moving direction of the optical pickup, and the optical pickup guiding member is arranged just under or just over the optical pickup.
According to this configuration, the optical pickup guiding member joined to the optical pickup to guide it can be arranged under or over the light emitting element, the light receiving element, the lens, and the mirror as the element components of the optical pickup for generating the light beam, and the optical path of the light beam. In other words, the optical pickup guiding member can be arranged to overlap with the light emitting element, the light receiving element, the lens, and the mirror as the element components of the optical pickup for generating the light beam, and the optical path of the light beam in the projection surface. As a result, a projection area of the optical pickup guiding member can be reduced, and a size reduction of the disc device can be attained.
Also, the disc device of the present invention further includes a base chassis for holding the disc turning portion such that a position of the disc turning portion is adjustable, and supporting the frame such that a position of the frame is adjustable; wherein the optical pickup guiding member is formed integrally with the base chassis.
According to this configuration, there is no need to provide another optical pickup guiding member separately. Therefore, the number of components can be reduced and the configuration can be simplified.
Also, the disc device of the present invention further includes a first energizing member which energizes the frame against an adjusting direction of the optical pickup adjusting portion; and a second energizing member which energizes the frame in a direction except the adjusting direction of the optical pickup adjusting portion; wherein the first energizing member and the second energizing member are formed by one energizing member.
According to this configuration, since the frame is energized in the opposite direction to the adjusting direction of the optical pickup adjusting portion or in the different direction from the adjusting direction, the frame can be adjusted without wobble and rattle. Also, since one energizing member is used commonly as the first energizing member and the second energizing member to energize the frame in both direction at this time, the number of components can be reduced.
Also, the disc device of the present invention further includes a moving area restricting portion which restricts a moving position of the frame; wherein the moving area restricting portion is provided to the optical pickup adjusting portion.
According to this configuration, the moving area restricting portion prevents such an event that the frame is moved in excess of a moving range in the tilt adjustment. Therefore, it can be prevented that an excessive load is applied to the frame.
Also, the disc device of the present invention further includes a disc turning portion restricting member which restricts a moving position of the disc turning portion; wherein the disc turning portion restricting member is provided to the turntable adjusting portion.
According to this configuration, the turning portion restricting member prevents such an event that the disc turning portion is moved in excess of a moving range in the tilt adjustment. Therefore, it can be prevented that an excessive load is applied to the disc turning portion.
In addition, an electronic device of the present invention having the above disc device.
According to this configuration, a slimming down of the disc drive portion can be achieved, and a compactification can be achieved as a whole electronic device.
In the present invention, as the tilt adjusting portion that can adjust the optical axis of the light beam emitted from the optical pickup in the direction perpendicular to the disc, both the turntable adjusting portion for adjusting a tilt of the disc loading face of the disc turning portion and the optical pickup adjusting portion for adjusting a position of the frame that holds the optical pickup driving portion are provided. Therefore, the present invention can provide the disc device that possesses such advantages that a margin for adjustment of respective adjusting portions can be reduced and also a slimming down of the disc device can be achieved.
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301 base chassis
10 car audio system (electronic device)
100 disc device
200 disc
301a guide portion (optical pickup guiding member)
302 turntable (disc turning portion)
303 optical pickup
303b light beam
303c optical axis
304 traverse motor (optical pickup driving portion)
305 feed screw (optical pickup driving portion)
307 frame
307a boss (moving area restricting portion)
307b guide screw (moving area restricting portion)
500 optical pickup adjusting portion (tilt adjusting portion)
502 spring (first energizing member, second energizing member)
600 turntable adjusting portion (tilt adjusting portion)
600a, 600b fixing portion
600c adjusting portion
607 stopper (disc turning portion restricting member)
Embodiments of the present invention will be explained with reference to the drawings hereinafter.
An overall perspective view of a car audio system 10 as an electronic device in which a disc device 100 according to embodiments of the present invention is built is shown in
Next, the disc device 100 will be explained hereunder.
In
As shown in
Next, the disc recording/reproducing portion 300 will be explained hereunder.
As shown in
Also, the feed screw 305 and the traverse motor 304 as a part of an optical pickup driving portion are provided along the longitudinal direction of the base chassis 301. The feed screw 305 is turned/driven by the traverse motor 304. The optical pickup 303 for recording/reproducing information of the disc 200 is provided to the feed screw 305 to engage with grooves of the feed screw 305. The optical pickup 303 can be reciprocally moved by the revolution of the traverse motor 304 in the radial direction of the disc 200 along the feed screw 305.
The traverse motor 304 is fitted to one end of a frame 307 having a U-shaped portion, which is formed like a substantially U-shape, via a motor bracket 304a. Also, the top end portion of the feed screw 305 fitted to the traverse motor 304 is held rotatably by a cap 402 (see
As shown in
As shown in
Also, the base chassis 301 has a tilt adjusting portion whose details will be described later. This tilt adjusting portion adjusts the light beam 303b (see
Next, the optical pickup adjusting portion 400 as a part of the tilt adjusting portion will be explained in detail hereunder.
As shown in
A hole into which the top end of the feed screw 305 is inserted is provided in the center of the cap 402. When the top end of the feed screw 305 is inserted into the hole of the cap 402, the feed screw 305 is supported rotatably by the cap 402. Also, the feed screw 305 is energized by an energizing member (not shown) in the direction along which the rotating shaft of the feed screw comes close to the cap 402 (the A direction in
As shown in
The adjust screw 404 is provided in the oblique direction to the guide face 401a. For example, as shown in
Also, the adjust screw 404 is arranged with respect to the cylindrical portion 402a of the cap 402 in the opposite direction to the disc 200 loaded on the turntable 302 (in the downward direction in
As shown in
Therefore, when the cylindrical portion 402a of the cap 402 is moved vertically along the guide shaft 401 by turning the adjust screw 404, the top end portion of the frame 307 is also moved vertically. Thus, a distance between the disc 200 loaded on the turntable 302 and the feed screw 305 is changed. Accordingly, the light beam 303b emitted from the optical pickup 303 can be adjusted such that its optical axis 303c is set perpendicularly to the disc 200.
Also, as shown in
Similarly, an amount of movement of the adjust screw 404 in the lateral direction (a dimension H3 in
In this manner, the adjust screw 404 is moved in the oblique direction to the guide face 401a and in the vertical direction to the frame 307. Therefore, an amount of movement of the adjust screw 404 can be reduced smaller than a necessary amount of tilt adjustment of the frame 307. As a result, a slimming down of the tilt adjusting portion can be achieved. Here, the top end portion of the cap 402 that is fitted to the frame 307 is energized by the torsion coil spring 405 to come into contact with the adjust screw 404 and the guide face 401a. Therefore, the top end portion of the optical pickup driving portion can be adjusted to come close to and go away from the disc without wobbling and rattling.
Also, even though a distance between the cap 402 and the disc 200 loaded on the turntable 302 in the height direction (a dimension H in
Also, the torsion coil spring 405 is constructed to energize the cap 402 toward the base chassis 301 (the C direction in
Also, a contact portion of the projection portion 303a of the optical pickup 303 to the guide portion 301a is formed like an almost hemispherical shape. Therefore, even when the feed screw 305 is moved in the E direction in
In the above embodiment, the guide shaft 401 is arranged on the center side of the turntable 302, and the adjust screw 404 is arranged on the outer side. In this case, as shown in
Also, in the above embodiment, the traverse motor 304 and the feed screw 305 are constructed integrally. According to the present invention, a power transmitting portion such as a gear, or the like, for example, may be provided between the traverse motor 304 and the feed screw 305.
Also, in the above embodiment, both a function of transmitting a driving force to move the optical pickup 303 to the inner periphery and the outer periphery and a function of guiding a movement of the optical pickup 303 are performed compatibly by the feed screw 305. According to the present invention, a guiding member different from the feed screw 305 may be provided.
Also, in the above embodiment, the base chassis 301 and the cap 402 are energized by the torsion coil spring 405. According to the present invention, both members may be energized by another energizing member except the torsion coil spring (e.g., a plate spring, a tensile coil spring, a compression spring, or the like).
Also, in the above embodiment, the cap 402 fitted to the top end of the feed screw 305 is moved/adjusted by the adjust screw 404. But the feed screw 305 may be moved directly. Also, the contact portions between the cap 402 and the guide shaft 401 and between the plane portion 404a of the adjust screw 404 and the arm 404b of the torsion coil spring 405 are implemented by the cylindrical portion 402a having the same diameter and provided to the cap 402. According to the present invention, respective contact portions may be implemented by cylindrical faces having a different diameter respectively.
Next, the optical pickup adjusting portion 500 as a part of the tilt adjusting portion will be explained hereunder.
In
Although as already explained schematically in
Also, as shown in
As shown in
Therefore, a main body 502c of the coil spring 502 is fitted onto the spring supporting rod 307f, then one arm 502a of the coil spring 502 is hitched on the spring hitching claw 301g of the base chassis 301, and the other arm 502b of the coil spring 502 is hitched on the spring hitching portion 307e of the frame 307. Accordingly, the coil spring 502 energizes the frame 307 in the direction toward the rotation center of the disc 200 (in the A direction in
Meanwhile, a receiving portion 301e is formed on the base end portion of the base chassis 301 to position under the traverse motor 304 horizontally. An internal thread portion 301f is formed in this receiving portion 301e. An adjust screw 501 serving as an adjusting member of the optical pickup adjusting portion 500 is screwed into the internal thread portion 301f, and can be moved in the directions E, F in
As described above, the optical pickup driving portion has the traverse motor 304, the feed screw 305, and the cap 402. Also, one coil spring 502 has both a function of the compression spring (the first energizing member) that energizes the frame 307 in the opposite direction to the adjusting direction of the optical pickup adjusting portion 500, and a function of the torsion coil spring (a second energizing member) that energizes the frame 307 in the direction except the adjusting direction of the optical pickup adjusting portion 500 (here, energizes the frame 307 toward the turntable 302 side). As a result, the number of components can be reduced, and a slimming down of the optical pickup adjusting portion 500 can be achieved.
Also, when a distance between the traverse motor 304 and the disc 200 put on the turntable 302 is adjusted by moving the adjust screw 501, the tilt adjustment for adjusting the light beam 303b emitted from the optical pickup 303 such that its optical axis 303c is set perpendicularly to the disc 200 put on the turntable 302 can be carried out.
Also, since the frame 307 is energized by the coil spring 502, the wobble and rattle of the frame 307, and the feed screw 305 and the optical pickup 303, which are fitted integrally to this frame, caused due to the disturbance such as the vibration, or the like can be prevented.
Also, moving areas of the boss 307a and the guide screw 307b of the frame 307 are restricted by the guide hole 301b and the guide hole 301c provided to the base chassis 301. Therefore, even though an impact in excess of a spring load is applied to the coil spring 502, the frame 307 held with a pressure by the coil spring 502, the optical pickup 303 fitted integrally with the frame 307, and the like during the transportation of the products, or the like and then the frame 307 is moved away from the base chassis 301 (in the direction F in
Next, the turntable adjusting portion 600 as a part of the tilt adjusting portion will be explained hereunder.
In
As shown in
More particularly, as shown in
As shown in
Therefore, when the adjust screw 605 is moved in the F direction in
A stopper portion 607 as a disc turning portion restricting member having a shade portion 607a on its top end is fitted on the base plate 310 between the fixing portion 600b and the adjusting portion 600c. A projection 310d is provided on the base plate 310 under the shade portion 607a. When the base plate 310 moves upward by a predetermined height, such base plate 310 comes in touch with the shade portion 607a of the stopper portion 607. Thus, the base plate 310 is restricted not to go up further more.
Therefore, even when an impact in excess of a spring load is applied to the spindle motor 309 held with a pressure by the spring 606 during the falling down or the transportation of the products, or the like and then the spindle motor 309 is moved away from the base chassis 301 (in the direction F in
Also, the straight line L1 connecting two fixing portions 600a, 600b acting as the fulcrums of the inclination of the spindle motor 309 is arranged in a position that intersect orthogonally with the transfer direction of the optical pickup 303. Therefore, the spindle motor 309 is never tilted in the tangential direction (the C direction in
Next, a disc device 100B according to a second embodiment of the present invention will be explained hereunder.
In
Next, the disc recording/reproducing portion 300B will be explained hereunder.
In
Next, the optical pickup adjusting portion 400B will be explained hereunder. Here, the same reference symbols are affixed to the portions that have already been explained in the first embodiment, and their redundant explanation will be omitted herein.
In
A hole into which the top end of the feed screw 305 is inserted is provided in the center of the cap 406. The feed screw 305 is supported rotatably in the cap 406 when the top end portion of the feed screw 305 is inserted into the hole of the cap 406. Also, a outer peripheral face 406b having a cylindrical shape is provided on the outer periphery of the cap 406, which contacts the plane portion 404a of the adjust screw 404 and the arm 405b of the torsion coil spring 405. In contrast, an outer peripheral face 406c having a planar shape is provided on the outer periphery of the cap 406, which contacts the guide shaft 401. That is, an outer peripheral surface of the cap 406 is constructed like an almost D-shape.
Therefore, an outer peripheral face 406b of the cap 406 is always brought into contact with the plane portion 404a of the adjust screw 404 by the spring force of the torsion coil spring 405. Also, the outer peripheral face 406c of the cap 406 always contacts the guide shaft 401. As a result, when a distance between the cap 406 and the disc 200 is adjusted by moving the adjust screw 404, the tilt adjustment for adjusting the light beam 303b emitted from the optical pickup 303 such that its optical axis 303c is set perpendicularly to the disc 200 put on the turntable 302 can be carried out.
Also, even when a distance between the cap 406 and the disc 200 loaded on the turntable 302 in the height direction (the dimension H in
Also, the outer peripheral face 406c of the cap 406 has a planar shape and the outer peripheral face 406b of the cap 406 has a cylindrical shape. Therefore, the guide shaft 401 and the outer peripheral face 406c of the cap 406 can always maintain a linear contact face. In other words, the cap 406 and the frame 307 can be moved in the direction to adjust a distance between the cap 406 and the disc 200, while holding a posture in the rotating direction (the directions E, F in
As described above, the optical pickup adjusting portion 400B according to the second embodiment is constructed. Hence, an amount of movement of the adjust screw 404 as the tilt adjusting member can be reduced smaller that a necessary amount of tilt adjustment in the optical pickup adjusting portion 500 (see
In the above embodiment, the guide shaft 401 is arranged on the center side of the turntable 302, and the adjust screw 404 is arranged on the outer side. In this case, as shown in
Also, in the above embodiment, the traverse motor 304 and the feed screw 305 are constructed integrally. According to the present invention, a power transmitting portion such as a gear, or the like, for example, may be provided between the traverse motor 304 and the feed screw 305. In this case, the similar optical pickup adjusting portion 400B can be implemented by providing the cap 406 to both end portions of the feed screw 305.
Also, in the present embodiment, both a function of transmitting a driving force to move the optical pickup 303 to the inner periphery and the outer periphery and a function of guiding a movement of the optical pickup 303 are performed compatibly by the feed screw 305. According to the present invention, a guiding member different from the feed screw 305 may be provided and the tilt adjustment may be applied to this guiding member.
Also, in the present embodiment, the base chassis 301 and the cap 402 are energized by the torsion coil spring 405. According to the present invention, both members may be energized by another energizing member except the torsion coil spring (e.g., a plate spring, a tensile coil spring, a compression spring, or the like).
Also, in the present embodiment, the contact portions between the cap 406 and the plane portion 404a of the adjust screw 404 and the arm 405b of the torsion coil spring 405 are implemented by the cylindrical portion 406b having the same diameter and provided to the cap 406. According to the present invention, respective contact portions may be implemented by cylindrical faces having a different diameter respectively.
Also, in the present embodiment, the optical pickup adjusting portion 400B is implemented by adjusting a height of the guiding portion of the optical pickup 303. According to the present invention, since the shapes similar to the outer peripheral faces 406b, 406c of the cap 406 are provided to the spindle motor 309, the tilt adjustment may be implemented by adjusting a height of the spindle motor 309.
In addition, in the first embodiment and the second embodiment, explanation is made by using the so-called changer type disk drive, in which plural sheets of trays are provided and also the base chassis is provided to turn and move vertically, as the disc device 100. In this case, even when the present invention is applied to the disc device that performs the recording/reproducing operation by emitting the light beam onto the disc loaded on the turntable from the optical pickup that can be moved in the radial direction of the disc loaded on the turntable, irrespective of that the trays are present or not and the base chassis can be turned or moved vertically, the similar advantages can be achieved.
The present application is based upon Japanese Patent Application (Patent Application No. 2006-281440) filed on Oct. 16, 2006; the contents of which are incorporated herein by reference.
As described above, in the disc device according to the present invention, in order to adjust the optical axis of the light beam emitted from the optical pickup in the direction perpendicular to the disc, both the turntable adjusting portion for adjusting a tilt of the disc loading face of the disc turning portion and the optical pickup adjusting portion for adjusting a position of the frame that holds the optical pickup driving portion are provided. Therefore, the present invention can possess such advantages that a margin for adjustment of respective adjusting portions can be reduced and also a slimming down of the disc device can be achieved, and is useful for the disc device that is capable of achieving a slimming down of the tilt adjusting portion that can adjust the optical axis of the light beam emitted from the optical pickup in the direction perpendicular to the information recording face of the disc, and others.
Number | Date | Country | Kind |
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2006-281440 | Oct 2006 | JP | national |
Filing Document | Filing Date | Country | Kind | 371c Date |
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PCT/JP2007/070198 | 10/16/2007 | WO | 00 | 4/15/2009 |