JP2003091969A - Information recording/reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a collision sound generating between a clamper and a turntable when a disk-like recording medium is clamped, and also to realize a mechanism for increasing a force for separating the clamper from the turntable in releasing the clamping by a simple method. SOLUTION: The device is equipped with an optical head 10, a spindle motor 20 having a turntable 21, a pickup unit 30 consisting of the optical head, the spindle motor and a support base 31 for holding them, a pickup holder 40 for holding the pickup unit, and a mechanism 60 for attaching/detaching the clamper C and the pickup holder to/from the disk-like recording medium on a disk tray at the recording/reproducing position. The attaching and detaching mechanism is provided with a mechanism for reducing the speed of the pickup holder moving to the disk tray.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information recording / removing mechanism provided with a contact / separation mechanism for advancing and retracting a pickup unit in order to clamp or unclamp the central part of a disc-shaped recording medium between a clamper and a turntable. Reproduction device

[0002]

2. Description of the Related Art A disc device (information recording / reproducing device) for recording / reproducing an optical disc such as a CD-ROM or a CD-R / RW is standardly equipped in a computer device such as a personal computer. As this type of information recording / reproducing apparatus, a disc tray for holding a disc-shaped recording medium, which is slidably supported inward and outward through an opening provided in a box-shaped apparatus body, and a disc tray for recording in the apparatus body Playback/
A moving means for moving the disc-shaped recording medium to a position, an optical head for recording / reproducing on / from the disc-shaped recording medium when the disc-shaped recording medium is at the recording / reproducing position in the apparatus main body, and a turntable for holding and rotating the disc-shaped recording medium. A pickup unit including a spindle motor including the optical head, the optical head, the spindle motor, and a support base for holding the same; a pickup holder for holding the pickup unit; and a disk-shaped recording medium for a turntable of the spindle motor. It is known to include a clamper which is rotatably supported by being sandwiched between the clamper and a contacting / separating mechanism for contacting / separating the pickup holder to / from the disk-shaped recording medium on the disk tray at the recording / reproducing position. . Thus, in order to clamp the disc-shaped recording medium between the clamper and the turntable, the information recording / reproducing apparatus configured to move the pickup holder in the clamping direction by the contacting / separating mechanism at the time of clamping,
Various things have been proposed. Among the information recording / reproducing apparatuses provided with such a contact / separation mechanism, as a conventional technique for achieving a function with a simple configuration, for example, Japanese Patent Laid-Open No. 2000-1
There is an "optical disk drive device and method thereof" disclosed in Japanese Patent No. 49368.

6 and 7 show the structure of this prior art. 6A, 6B, and 6C are a front view, a plan view, and a side view showing the configuration of the pickup holder that is retracted by the contact / separation mechanism, and FIG.
(B) And (c) is a front view, a plan view, and a side view showing the configuration of the pickup holder in a state of being moved to the clamp position by the contact / separation mechanism. Although the disk-shaped recording medium D and the clamper C are shown in each drawing, the disk tray that supports the disk-shaped recording medium is not shown. This information recording / reproducing apparatus includes an optical head 10 for recording / reproducing and a spindle motor 20 for rotating a disc-shaped recording medium (hereinafter referred to as an optical disc) D.
A pickup unit 30 that supports the optical head 10 and the spindle motor 20 on a support base 31, a pickup holder 40 that holds the pickup unit 30, and a contact / separation unit that moves the pickup holder 40 back and forth between a clamp position and a retracted position. And a mechanism 50. The optical head 10 is supported by a guide rail 32 on a support base 31 so as to be able to advance and retreat in the radial direction of the optical disc indicated by the arrow. The spindle motor 20 supported on the support base 31 fits and supports the center hole of the optical disc D by the turntable 21 attached to its output shaft. FIG. 2C shows the state, in which the clamper C and the turntable 21 rotatably provided on the apparatus main body side.
The central part of the optical disc D is clamped between and to support it rotatably. By fixing the support base 31 to the pickup holder 40 with the bolts 33, the pickup unit 30 is fixed to the pickup holder 40. The pickup holder 40 is supported from the retracted position shown in FIG. 6 to the one shown in FIG. 7 by supporting the rotary shafts 41 provided on both end surfaces near one end thereof in the vertical direction as shown by the arrow by the apparatus main body. It is configured to be able to move back and forth to the clamp position shown. Further, two round bar-shaped guide projections 42 project from the opposite end surface (front surface) of the pickup holder 40. The contact / separation mechanism 50 has a slider plate 51 having the guide projection 42 and a cam slit 52 having an inclined surface 55 that engages with the guide projection 42.
It consists of and. The cam slits 52 have the same shape and the same size, and are formed at the same height position. Horizontal portions 53 and 54 linearly extending in the vertical direction (horizontal direction in FIG. 7A) are provided at both ends of each cam slit 52, respectively.
An inclined surface (inclined portion) 55 that is inclined and linearly extends so as to connect between the horizontal portions 53 and 54. The inclination angle of the inclined surface 55 is usually 45 degrees.

FIG. 6 shows a case where the slider plate 51 is shifted to the left side. At this time, the pickup holder 40 and the pickup unit 30 are located below (retracted position) about the rotation shaft 41. And the clamp is released. On the other hand, FIG. 7 shows a case where the slider plate 51 is shifted to the right side, and at this time, the pickup holder 40 and the pickup unit 30 are located above (the clamp position) with the rotation shaft 41 as the center and in the clamped state. Has become. That is, by moving the slider plate 51 to the left and right, the guide projection 42
Moves diagonally up and down along the inclined surface 55, and the pickup holder 40 rotates about the rotation shaft 41 to perform the lifting operation (clamping and unclamping operation) of the pickup unit 30.

[0005]

[Problems to be Solved by the Invention] With the progress of technology,
The rotation speed of the disc-shaped recording medium (information recording medium) D is dramatically improved. As a result, problems such as the recording medium separating from the turntable 21 of the spindle motor during high-speed rotation, and the recording medium D idling during acceleration and deceleration of the rotation are likely to occur. Therefore, it is necessary to increase the clamping force for fixing the recording medium to the spindle motor 20 as the rotation speed of the spindle motor increases. Specifically, the contact / separation mechanism 50 is configured to increase the clamping force of the recording medium D between the turntable 21 and the clamper C. However, in the lifting operation mechanism of the pickup unit 30 described in the above publication, when the clamping force is increased, the clamping force between the clamper C and the turntable 21 becomes stronger. (1) When the clamper C is clamped, Turntable 21
The collision sound with becomes louder. (2) When the clamp is released, the force for separating the clamper C and the turntable 21 from each other becomes large, so that the mechanism for separating the structure becomes large and complicated. Two problems occur. The present invention has been made in view of the above, and reduces the collision noise between the clamper and the turntable, which occurs when the disc-shaped recording medium is clamped, and the separating force between the clamper and the turntable when the clamp is released. The purpose of the present invention is to realize a mechanism for increasing the power consumption by a simple method.

[0006]

In order to solve the above-mentioned problems, the invention according to claim 1 holds a disc-shaped recording medium which is slidably supported inward and outward from an opening provided in the apparatus main body. And a turntable for holding and rotating the disc-shaped recording medium when the disc-shaped recording medium is in the recording / reproducing position in the main body of the apparatus. A pickup unit including a spindle motor, the optical head, the spindle motor, and a support base that holds the pickup unit, a pickup holder that holds the pickup unit, and a disk-shaped recording medium are sandwiched between a turntable of the spindle motor. The clamper that rotatably supports and the pickup holder at the recording / playback position. A contacting / separating mechanism for contacting / separating with respect to the disc-shaped recording medium on the disc tray, wherein the contacting / separating mechanism includes a deceleration mechanism for decelerating the speed at which the pickup holder moves to the disc tray side. It is characterized by being According to a second aspect of the present invention, a disc tray that holds a disc-shaped recording medium that is slidably supported inward and outward through an opening provided in the device body, and the disc-shaped recording medium is at a recording / reproducing position in the device body. An optical head for recording / reproducing on / from a disc-shaped recording medium at a certain time, a spindle motor having a turntable for holding and rotating the disc-shaped recording medium, the optical head, the spindle motor, and a support base for holding these. A pickup unit, a pickup holder for holding the pickup unit, a clamper for rotatably supporting a disc-shaped recording medium between a turntable of a spindle motor, and the pickup holder at a recording / reproducing position. Contact / separation to contact / separate the disc-shaped recording medium on the disc tray Comprising a structure, wherein the separation mechanism is characterized by having enhanced mechanism to increase the separation force between the clamp release time of the clamper and the turntable. According to a third aspect of the invention, the contacting / separating mechanism includes a guide projection protruding from the pickup holder, and a slider plate provided with a cam slit having an inclined surface that is engaged with the guide projection and is inclined at a predetermined angle. And a configuration in which the guide projection reciprocates along the inclined surface when the slider plate slides back and forth in a predetermined direction to move the pickup unit in the clamp direction during clamping, and the cam slit of the slider plate The inclination angle of the inclined surface of
It is characterized by having two or more steps.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below with reference to the embodiments shown in the drawings. 1A, 1B, and 1C are a front view, a plan view, and a side view showing the configuration of the pickup holder in a state of being retracted by the contacting / separating mechanism, and FIGS. 8A and 8C are a front view, a plan view, and a side view showing the configuration of the pickup holder in a state of being moved to the clamp position by the contacting / separating mechanism. In each figure, the disc tray supporting the disc-shaped recording medium is omitted. This information record /
The reproducing apparatus includes a box-shaped apparatus main body (not shown), a clamper C positioned at a proper position in the apparatus main body, an optical head 10 for recording / reproducing arranged in the apparatus main body, a disk-shaped recording medium (hereinafter , An optical disk) D for rotating a spindle motor 20, a pickup unit 30 for supporting the optical head 10 and the spindle motor 20 on a support base 31, a pickup holder 40 for holding the pickup unit 30, and a clamp for the pickup holder 40. The contact / separation mechanism 60 is configured to move back and forth between the position and the retracted position. A disc tray that detachably supports an optical disc is slidably supported from an opening provided in the device body, and when the disc tray is at a recording / reproducing position in the device body,
The center of the optical disc on the disc tray is clamped between the clamper C and the spindle motor 20. The optical head 10 is supported by a guide rail 32 on a support base 31 so as to be able to advance and retreat in the radial direction of the optical disc indicated by the arrow.

The spindle motor 20 supported on the support base 31 fits and supports the center hole of the optical disc D by the turntable 21 attached to its output shaft.
FIG. 2C shows this state, in which the central portion of the optical disc D is clamped between the clamper C rotatably provided on the apparatus main body side and the turntable 21 and rotatably supported. By fixing the support base 31 to the pickup holder 40 with the bolts 33, the pickup unit 30 is fixed to the pickup holder 40. The pickup holder 40 is rotated from the retracted position shown in FIG. 1 to the one shown in FIG. 2 by supporting the rotating shafts 41 provided on both end surfaces near one end thereof in the vertical direction as shown by the arrow by the apparatus body. It is configured to be able to move back and forth to the clamp position shown. Further, two round bar-shaped guide projections 42 project from the opposite end surface (front surface) of the pickup holder 40. The contact / separation mechanism 60 includes the guide protrusion 42 and
The slider plate 61 includes a cam slit 62 having a multi-step inclined surface (multi-step inclined portion) 65 that engages with the guide projection 42. Each cam slit 6
2 have the same shape and the same size, and are formed at the same height position. Horizontal portions 6 extending linearly in the vertical direction (the horizontal direction in FIG. 2A) are provided at both ends of each cam slit 62.
3, 64 and a multi-stage inclined surface (multi-stage inclined portion) 65 that is inclined and linearly extends so as to connect between the horizontal portions 63, 64.
And are equipped with. The multi-step inclined surface 65 of this embodiment is
It is a two-level inclined surface.

FIG. 1 shows a case where the slider plate 61 is shifted to the left side (left side in the front view of (a)), that is, the pickup holder 40 and the pickup unit 30 are moved downward (about the rotation shaft 41). It is located in the retracted position) and is in the unclamped state. On the other hand, FIG. 2 shows that when the slider plate 61 is shifted to the right,
That is, the pickup holder 40 and the pickup unit 30 are located above the rotation shaft 41 (clamping position) and are in a clamped state. That is, when the slider plate 61 moves to the right and left, the guide projection 42 moves in a diagonally upward and downward direction along the multi-step inclined surface 65, and the pickup holder 40 moves.
Pickup unit 3 by rotating around 1
The ascending / descending operation of 0 (clamping and unclamping operation) is performed. The multi-step inclined surface 65 is the first inclined surface 6
5a and the second inclined surface 65b are continuous, the first inclined surface 65a has an inclination angle of 30 degrees with respect to the horizontal plane, and the second inclined surface 65b has 4 degrees with respect to the horizontal plane.
The inclination angle is 5 degrees. In the conventional examples shown in FIGS. 6 and 7, the inclined surface of the cam slit has a one-step structure, and the inclination angle is 45 degrees. Therefore, the contacting / separating mechanism 60 of the present invention has an effect of reducing the moving speed on the pickup unit 30 side when the optical disc D is clamped between the turntable 21 and the clamper C. That is, the contacting / separating mechanism 60 includes the first inclined surface 65a as a speed reducing mechanism that reduces the noise by reducing the speed when the pickup holder moves to the disc tray side.

The principle of reducing the moving (raising) speed of the pickup unit when the optical disk is clamped by the operation of the contacting / separating mechanism will be described below. 3A and 3B show the cam slit 62 of the slider plate 61.
And the guide protrusion 42 is schematically shown. Figure 3
6A is a case of the conventional example shown in FIGS. 6 and 7, and in the conventional example in which the inclination angle of the inclined surface 55 is 45 degrees, when the slider plate 51 moves to the right in the horizontal direction by the distance S, The guide protrusion 42 (the pickup unit 30 and the pickup holder 40) also moves upward by the distance H1. On the other hand, FIG. 3B is an explanatory view of the operation of the contacting / separating mechanism of the present invention.
Is moved to the right in the horizontal direction by the distance S, the guide protrusion 42 moves upward by a distance S * tan 30 ° (= 0.58).
S), which means that you will only move. That is, as compared with the case of the conventional example shown in FIG. 3A, in the case of the present invention, the rising speed of the pickup unit 30 per unit time is reduced by 0.58 times immediately before clamping. It means that

Next, the principle of increasing the separation force between the clamper and the turntable when the clamp is released will be described. FIG. 4 schematically shows the relationship between the cam slit 62 of the slider plate 61 and the guide projection 42 during the contact / separation operation. FIG. 4A shows the case of the conventional example shown in FIGS. 6 and 7, and shows the force applied to the guide projection 42 when the slider plate 51 moves in the horizontal direction. On the other hand, FIG. 4B shows the case of the contacting / separating mechanism of the present invention, and shows the force applied to the guide projection 42 when the slider plate 61 moves in the horizontal direction.
Comparing this, in the prior art, the force F1 generated in the direction (downward) separating the clamper C and the turntable 21 at the time of releasing the clamp is F * cos 45 °, whereas in the present invention, the clamper C at the time of releasing the clamp. The force F2 generated in the direction (downward) of separating the turntable 21 and the turntable 21 becomes F * cos 30 °, resulting in 30
In the first inclined surface 65a having an inclination angle of 5 degrees, Double separation force will be generated. That is, the contact / separation mechanism 60 has the first inclined surface 65a as a strengthening mechanism that increases the separation force between the clamper and the turntable when the clamp is released.

As described above, according to the present invention, the cam slit 62 is provided.
Although the above-described two effects are obtained by easing a part of the inclination of No. 2, the two-stage configuration may increase the moving distance of the slider plate 61 during the clamp operation. That is, the side effect of increasing the time required for the clamp operation is also occurring. Therefore, in another embodiment shown in FIG. 5, the multi-step inclined surface 65 of the cam slit 62 is provided.
By increasing the number of steps to 3 or more, the pickup ascent speed immediately before clamping is maximally reduced, and the maximum separation force is exerted immediately after the start of unclamping, and the increase in the time required for clamping operation is minimized. As a limit method, the inclination of the slider plate is set in multiple stages of three stages or more so that the moving distance is not increased so much. That is, in this embodiment, the third inclined surface is provided between the first inclined surface 65a (inclination angle a) located above the cam slit 62 and the second inclined surface 65b (inclination angle c) located below. 65c (inclination angle c) is arranged, and the inclination angles a, b, and c of the respective inclined surfaces are set to be a <b <c. That is, in the embodiment shown in FIG. 1, since the multi-step inclined surface is composed of two inclined surfaces having inclination angles of 30 degrees and 45 degrees, the guide protrusion 42 has the first inclination angle of 30 degrees. There was a delay in the clamp operation speed when moving within the inclined surface 65a. On the other hand, in the present embodiment, the third inclined surface 65c having an intermediate inclination angle between the first and second inclined surfaces 65a and 65b is provided, so that the embodiment of FIG. The moving speed can be increased as compared with the case where only the first inclined surface 65a is provided in addition to the second inclined surface 65b. That is, while the first inclined surface 65a can still sufficiently exert the function of reducing the collision noise during clamping, the problem of the decrease in the clamp speed due to the existence of the first inclined surface 65a is reduced.
I am trying to make up for it.

As described above, according to the present invention, the collision sound between the clamper and the turntable, which is generated when the disk-shaped recording medium is clamped between the turntable and the clamper, is reduced. In addition, a mechanism for increasing the separation force between the clamper and the turntable when the clamp is released can be realized by a simple method.

[0014]

As described above, according to the present invention as set forth in claims 1 and 2, the collision noise between the clamper and the turntable generated when the disk-shaped recording medium is clamped is reduced, and A mechanism for increasing the separation force between the clamper and the turntable when the clamp is released can be realized by a simple method. Further, according to the present invention as set forth in claim 3, the cam slit forming the contacting / separating mechanism is a multi-step inclined surface having two or more steps, so that the above-mentioned object can be achieved without significantly increasing the clamp operation time. Can be achieved.

[Brief description of drawings]

1A, 1B, and 1C are a front view, a plan view, and a side view showing a configuration of a pickup holder that is retracted by a contacting / separating mechanism of the present invention.

2A, 2B, and 2C are a front view, a plan view, and a side view showing a configuration of a pickup holder in a state of being moved to a clamp position by a contacting / separating mechanism of the present invention.

FIG. 3 is a schematic view of a cam slit and a guide projection of a slider plate at the time of clamping, (a) is a conventional example,
FIG. 3B is a diagram showing an embodiment of the present invention.

FIG. 4 is a schematic diagram of a force for separating the clamper and the turntable when releasing the clamp, (a) is a conventional example,
FIG. 3B is a diagram showing an embodiment of the present invention.

FIG. 5 is a schematic view of a case where the inclined surface of the slider plate has three stages.

6A, 6B, and 6C are a front view, a plan view, and a side view showing the configuration of a pickup holder that is retracted by a conventional contacting / separating mechanism.

7 (a), (b) and (c) are a front view, a plan view and a side view showing the configuration of a pickup holder in a state of being moved to a clamp position by a contacting / separating mechanism of a conventional example.

[Explanation of symbols]

10 optical head, C clamper, D disk-shaped recording medium (optical disk), 20 spindle motor, 21
Turntable, 30 pickup unit, 31
Support base, 40 pickup holder, 42 guide protrusion, 60 contact / separation mechanism, 61 slider plate, 62
Cam slits, 63, 64 horizontal portions, 65 multi-step inclined surfaces (multi-step inclined portions), 65a first inclined surface, 65b second inclined surface, 65c third inclined surface.

Claims (3)

[Claims] 1. A disc tray that is slidably supported inward and outward from an opening provided in the apparatus body and holds a disc-shaped recording medium, and when the disc-shaped recording medium is at a recording / reproducing position in the apparatus body. An optical head for recording / reproducing on / from a disc-shaped recording medium, a spindle motor having a turntable for holding and rotating the disc-shaped recording medium, the optical head, the spindle motor, and a support base for holding these. A pickup unit, a pickup holder for holding the pickup unit, a clamper for rotatably supporting a disc-shaped recording medium between a turntable of a spindle motor, and a disc tray for holding the pickup holder at a recording / reproducing position. A contact / separation mechanism for contacting / separating with the upper disc-shaped recording medium The information recording / reproducing apparatus is characterized in that the contacting / separating mechanism includes a decelerating mechanism that decelerates the speed at which the pickup holder moves to the disc tray side. 2. A disc tray, which is slidably supported inward and outward through an opening provided in the apparatus main body and holds a disc-shaped recording medium, and when the disc-shaped recording medium is at a recording / reproducing position in the apparatus main body. An optical head for recording / reproducing on / from a disc-shaped recording medium, a spindle motor having a turntable for holding and rotating the disc-shaped recording medium, the optical head, the spindle motor, and a support base for holding these. A pickup unit, a pickup holder for holding the pickup unit, a clamper for rotatably supporting a disc-shaped recording medium between a turntable of a spindle motor, and a disc tray for holding the pickup holder at a recording / reproducing position. A contact / separation mechanism for contacting / separating with the upper disc-shaped recording medium The information recording / reproducing apparatus is characterized in that the contacting / separating mechanism has a strengthening mechanism for increasing the separating force between the clamper and the turntable when the clamp is released. 3. The contact / separation mechanism includes a guide plate protruding from the pickup holder, and a slider plate having a cam slit having an inclined surface which is engaged with the guide protrusion and is inclined at a predetermined angle. The slider plate reciprocally slides in a predetermined direction so that the guide protrusion reciprocates along the inclined surface to move the pickup unit in the clamping direction during clamping. 3. The information recording / reproducing apparatus according to claim 1, wherein the inclination angle of the surface is changed in the middle and has two or more inclinations.