JP4038061B2 - Optical pickup feeding device and optical disk device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an optical pickup feeding device that drives an optical pickup device for recording / reproducing information on / from an information recording / reproducing disc, and an optical disk device including the optical pickup feeding device.
[0002]
[Prior art]
FIG. 5 is an exploded perspective view of a conventional optical disk apparatus, wherein 1 is a top cabinet that is substantially U-shaped in front view as an exterior of the apparatus, 2 is a rating plate attached to the top cabinet 1, and 3 is a dust-proof sponge side. Reference numeral 4 denotes a dust-proof sponge top, the dust-proof sponge side 3 is attached to both side surfaces on the inside front of the top cabinet 1, and the dust-proof sponge top 4 is attached to the top surface on the inside front of the top cabinet 1.
[0003]
5 is a front bezel having an opening for inserting / removing an information disc, 6 is a door for opening / closing the opening of the front bezel 5, 7 is a tray for placing a disc, 8 is a dustproof sponge / bottom side, and 9 is a dustproof sponge / bottom. Reference numeral 10 denotes an insulating sheet, 11 denotes a bottom cabinet, and 12 denotes a screw. The insulating sheet 10 is placed on the bottom cabinet 11, dust-proof sponges and bottom sides 8 are arranged on both sides of the insulating sheet 10, and the insulating sheet 10 A dust-proof sponge bottom 9 is disposed in front of the.
[0004]
13 is a clamper A having a cylindrical convex portion at the center, 14 is a clamper plate having a circular hole in which the convex portion of the clamper A13 is loosely fitted, 15 is a yoke, 16 is a magnet, and the clamper A13 is a clamper plate 14 The yoke 15 and the magnet 16 are provided on the upper surface and provided in the convex portion of the clamper A13. 17 indicates a clamper B having a cylindrical convex portion at the center of one surface and a concave portion at the central portion of the opposite surface, and the convex portion of the clamper B17 is engaged with the convex portion of the clamper A13. The clamper B17 is rotatably attached to the clamper plate 14 together with the clamper A13.
[0005]
18 is a screw, 19 is a holder A, 20 is a holder B, 21 is a sub shaft, 22 is a holder C, 23 is a main shaft, 24 is a Teeth B, 25 is a Teeth spring, 26 is a Teeth pin, 27 is Teeth A, and 28 is a screw. The optical pickup PU is movably supported by the main shaft 23 and the sub shaft 21, and both ends of the main shaft 23 are supported by holders B20 and C22. Both ends of the sub shaft 21 are supported by holders A19 and C22. Supported. Teeth B24 is fixed to optical pickup PU by screw 28, Teeth A27 is provided in Teeth B24 so as to be able to come into contact with and separate from screw 35a described later, and coil-shaped Teeth spring 25 is provided between Teeth B24 and Teeth A27. The both ends of the Teeth spring 25 are loosely fitted to Teeth pins 26 and 26 erected on the surface of Teeth B24 and Teeth A27 facing Teeth B24.
[0006]
29 is a spindle motor flex which is a flexible wiring board, 30 is a spindle motor for rotating an optical disk, 31 is a vibration isolating rubber, 32 is a chassis, 33 is a screw, 34 is a screw, and 35 is a seek motor comprising a pulse motor. , 36 indicates vibration-proof rubber. A spindle motor flexible 29 is connected to the spindle motor 30, and power is supplied through the spindle motor flexible 29. Anti-vibration rubbers 31, 31, 36, 36 are attached to the four corners of the chassis 32, and a spindle motor 30 is attached to the front of the chassis 32 with screws 34, 34. Furthermore, a holder A19, a holder B20, and holders C22 and 22 are attached to the chassis 32 so that the main shaft 23 and the sub shaft 21 are disposed along the side of the chassis 32, and on the side of the optical pickup PU, The seek motor 35 is fixed by screws 33.
[0007]
The seek motor 35 is provided with a screw 35a. The seek motor 35 and the screw 35a are supported by a seek motor holder 35b. The seek motor holder 35b has teeth of Teeth A27 in a helical groove formed in the screw 35a. It is installed on the chassis 32 so as to match. Normally, the meshing state is maintained by the bias of the Teeth spring 25. Then, when the seek motor 35 rotates and the screw 35a rotates, the rotation of the screw 35a is transmitted to the Teeth A 27, and the Teeth A 27 moves along the screw 35a, so that the optical pickup PU performs a seek movement.
[0008]
37 and 38 are screws, 39 is an elevator sponge, 40 is a stopper, 41 is an elevator, 42 is a screw, 43 is a frame, and 49 is a loading motor. The frame 43 is provided with a loading motor 49 serving as a drive source for moving the tray 7 back and forth. An elevator sponge 39 and a stopper 40 are attached to the elevator 41, and the four corners of the chassis 32 to which the anti-vibration rubbers 31, 31, 36, and 36 are attached are attached to the elevator 41 with screws. Then, the elevator 41 is installed on the frame 43 with screws 37.
[0009]
Reference numeral 44 denotes a heat conductive sheet, 45 denotes a heat conductive sheet, 46 denotes a main PCB, and 47 denotes a front PCB. Thermal conductive sheets 44 and 45 are provided on the back surface of the main PCB 46, and the front PCB 47 is connected to the main PCB 46 by a flexible wiring board. The main PCB 46 is disposed in the central opening of the frame 43, and the front PCB 47 is It is arranged on the lower surface of the front side of the frame 43. Further, a tray 7 is disposed above the optical pickup PU, and a clamper plate 14 is disposed thereon.
[0010]
An optical disk apparatus is configured by disposing a frame 43 and a front bezel 5 on which various components are mounted between the top cabinet 1 and the bottom cabinet 11 and fixing the top cabinet 1 and the bottom cabinet 11 with screws 12. The
[0011]
FIG. 6 is a plan view showing a schematic configuration of a conventional optical pickup feeding device, in which 24a is an arm extending from a part of Teeth B 24, and 100 is a home switch provided in the chassis 32. FIG. When the seek motor 35 is driven and the optical pickup PU comes to the inner periphery, the home position is detected by the arm 24a pressing the home switch 100.
[0012]
By the way, in the past, in a recording / reproducing apparatus for reproducing and / or recording on a disk such as a CD-ROM, CD-R, CD-RW, DVD-ROM, etc., a seek motor for driving an optical pickup has recently been pulsed. There are some which are integrated with the screw. The main purpose of this is to simplify the space and reduce costs.
[0013]
In order to further reduce costs, the home sensor or switch that detects the home position of the optical pickup is deleted, the motor is stepped out by a stopper at a fixed position, and the home position is detected by increasing the current. There is also.
[0014]
[Problems to be solved by the invention]
However, in the optical disk apparatus of the type that detects the home position by stepping out the motor, when the motor steps out, the meshing portion (Teeth A) is disengaged from the spiral groove of the screw and the noise problem due to the tooth jump phenomenon, Noise is generated by the vibration of the meshing part.
[0015]
Usually, in the optical disk apparatus, in order to attach the Teth spring 25, as shown in FIG. 7, the distance a between Teeth A27 and Teeth B24 is set larger than the biting amount b between Teeth A27 and the screw 35a of the seek motor 35. This is the cause of tooth jumping easily. Accordingly, it is conceivable to increase the stress of the Teeth spring 25 that urges the Teeth A27 to the screw 35a in order to eliminate tooth jump at the time of step-out. However, in this case, a problem arises particularly in the durability of Teeth A27 and screw 35a.
[0016]
The present invention solves such problems, eliminates the skipping phenomenon even when the drive motor is out of step, and further suppresses the vibration of the meshing portion to realize low cost and low noise, and an information pickup apparatus and information It is to provide a disk device.
[0017]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 is a guide for supporting an optical pip-up for reading information by irradiating a disk-shaped information recording medium and guiding the information in the radial direction of the information recording medium. A shaft, a drive motor for moving the optical pickup, a screw having a spiral groove and rotated by the drive motor, and a tooth portion meshing with the spiral groove can be moved toward and away from the screw. A driving member having a meshing part supported on the optical pickup and a fixing part fixed to the optical pickup, a spring member pressing the tooth part against the screw side with appropriate pressure, and the optical pickup is located on the inner or outer peripheral side of the information recording medium A restricting member that restricts movement of the optical pickup toward the inner or outer periphery when the optical pickup reaches a certain position, and the optical member Control means for determining whether or not the optical pickup is at the home position when it detects a step-out of the drive motor when the movement of the cup is restricted, and the rotation of the screw via the drive member. In the optical pickup feeding device that transmits the optical pickup to the optical pickup and moves the optical pickup along the screw, a direction that is provided at a position facing the meshing portion with the screw interposed therebetween and separated from the screw a stopper for restricting movement of said engaging portion of, when the optical pickup is provided near the screw support portion has reached a predetermined position of the inner peripheral or outer peripheral side, the meshing portion of the drive member to said screw direction and an elastic member for biasing, the clearance between the stopper and the screw, before the teeth Characterized by being smaller than the amount bite into the spiral groove. With this configuration, the tooth portion can be prevented from being detached from the spiral groove of the screw even when the drive motor is out of step.
[0022]
According to a second aspect of the present invention, there is provided a motor for rotating a disk-shaped information recording medium, an optical pip-up for reading information by irradiating light to the disk-shaped information recording medium, and the optical pickup as the information recording medium. characterized by comprising an optical pickup feeding apparatus according to claim 1 Symbol placement moves in the radial direction. With this configuration, a low noise optical disc apparatus can be realized.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, detailed description is abbreviate | omitted by attaching | subjecting the same code | symbol about the member same as the member in the prior art shown in FIGS.
[0024]
Figure 1 is a plan view showing a schematic configuration of an optical disc apparatus having an optical pickup feeding device is a reference example of implementation of the invention, FIG 2 is a plan view showing the configuration of a vicinity of meshing portions of the screw and TeethA in FIG 1 24b is a stopper erected on both sides of the Teeth spring 25, and 101 is a rubber packing provided between the stopper 24b and the Teeth spring 25 and around the Teeth spring 25.
[0025]
This reference example is not a method of detecting the home position using the home switch 100 as shown in FIG. 6, but instead, the optical pickup PU is stopped by bringing a part of the optical pickup PU into contact with the holder B20. A method of detecting the home position by setting the position as the home position and detecting the increase in current by the seek motor 35 stepping out when the optical pickup PU moves to the inner peripheral side of the disk and contacts the holder B20. Adopted.
[0026]
Further, in FIG. 2, a stopper 24b is installed in Teeth B24, and the clearance c with Teeth A27 is set smaller than the biting amount b when Teeth A27 bites into screw 35a. Here, the biting amount b is such that the relationship of b <x + y is established, where x is the height of Teeth A27 and y is the depth of the spiral groove of the screw 35a. Further, the rubber packing 101 is elastically deformed in the urging direction of the Teeth spring 25, and is always in close contact with Teeth B24 and Teeth A27.
[0027]
In this way, since the clearance c is set to be smaller than the biting amount b, tooth jump does not occur. In addition, since the rubber packing 101 is provided around the Teeth spring 25, it is possible to attenuate the vibration of the Teeth A27 when the screw 35a vibrates at the time of step-out. As a result, noise during step-out can be reduced.
[0028]
Figure 3 is a plan view showing the configuration of a vicinity of meshing portions of the screw and TeethA27 in the optical pickup feeding device implementation form of the present invention, FIG. 4 is a side view of the vicinity of TeethA27, 27a is the screw 35a from the bottom of TeethA27 A stopper 102 extending in an L shape so as to surround is a leaf spring installed on the inner peripheral side of the disk in the seek motor holder 35b.
[0029]
Implementation form of this is obtained by providing the stopper 27a and the plate spring 102 in place of the stopper 24b and the rubber packing 101 in Reference Example.
[0030]
The clearance d between the surface of the stopper 27a facing the biting portion between the Teeth A27 and the screw 35a and the screw 35a is set smaller than the biting amount b when the Teeth A27 bites into the screw 35a. Further, when the optical pickup PU moves to the inner peripheral side of the disk and stops at the home position, the leaf spring 102 comes into contact with the Teeth A27, and the Teeth A27 is biased toward the screw 35a.
[0031]
In this way, since the clearance d is set to be smaller than the biting amount b, tooth jump does not occur. Further, since the biasing force of the leaf spring 102 is applied to the Teeth A27 only when the seek motor 35 is stepped out, the Teeth A27 is prevented from vibrating when the screw 35a vibrates. As a result, noise during step-out can be reduced.
[0032]
Note that the leaf spring 102 shown in FIG. 3 may be provided in the pickup feeding device of the reference example shown in FIG.
[0033]
【The invention's effect】
As described above, according to the present invention, a stopper that restricts the amount of movement of the meshing portion is provided, and the clearance between the stopper and the meshing portion does not theoretically deviate from the helical groove of the screw. By using the clearance, even if the drive motor steps out, the tooth portion of the meshing portion does not come off from the spiral groove of the screw, so that the tooth jump phenomenon can be prevented and the generation of noise can be prevented.
[Brief description of the drawings]
Figure 1 is a plan showing the configuration in the vicinity of the engagement portion between the screw and the TeethA in plan view Figure 2 Figure 1 shows a schematic configuration of an optical disc apparatus having an optical pickup feeding device is a reference example of implementation of the invention FIG side view of the vicinity of a plan view and FIG. 4] TeethA showing the configuration in the vicinity of the engagement portion between the screw and the TeethA in the optical pickup feeding device implementation form of the invention, FIG 5 shows the decomposition of a conventional optical disk device FIG. 6 is a plan view showing a schematic configuration of a conventional optical pickup feeding apparatus. FIG. 7 is a plan view showing a schematic configuration of another conventional optical pickup feeding apparatus.

Claims (2)

A guide shaft that supports an optical pip-up that reads information by irradiating light to a disk-shaped information recording medium, guides it in the radial direction of the information recording medium, a drive motor for moving the optical pickup, and a spiral A screw that has a groove and is rotated by the drive motor; a meshing part that supports a tooth part that meshes with the spiral groove so as to be movable toward and away from the screw; and a fixing part that is fixed to the optical pickup. A drive member having a spring member that presses the tooth portion against the screw with an appropriate pressure, and an inner circumference of the optical pickup when the optical pickup reaches a predetermined position on the inner circumference or outer circumference side of the information recording medium. Alternatively, a restricting member that restricts the movement toward the outer peripheral side, and the drive motor when the movement of the optical pickup is restricted by the restricting member Control means for determining whether or not the optical pickup is at a home position when a step-out is detected, and transmitting the rotation of the screw to the optical pickup via the drive member, In the optical pickup feeding device that moves along the screw,
A stopper that is provided at a position facing the meshing portion across the screw and restricts the movement of the meshing portion in a direction away from the screw, and is provided near the screw support portion , and the optical pickup An elastic member that urges the engagement portion of the drive member in the screw direction when reaching a certain position on the circumference or outer circumference side, and the clearance between the stopper and the screw is set to the spiral groove of the tooth portion An optical pickup feeding device characterized in that it is set smaller than the amount of biting. A motor for rotating a disk-shaped information recording medium, an optical pip-up for reading information by irradiating light to the disk-shaped information recording medium, and moving the optical pickup in a radial direction of the information recording medium. An optical disc apparatus comprising the optical pickup feeding device according to claim 1 .

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