JP2005093064A - Disk-recording and reproducing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a disk-reproducing device in which no special external force is required, while a disk is being attached or detached and recording and reproducing are conducted for the disk, required space is reduced and the disk is surely held and released, without causing damages that cause problems for the recording and the reproducing. <P>SOLUTION: The disk-reproducing device is provided with a driving force transmitting mechanism 7 which is engaged to a pickup and transmits its moving operation, a disk holding mechanism 31 which receives the operation transmitted from the driving force transmitting mechanism and holds or releases the disk on a turntable and an operation switching mechanism 33 which moves the position of the driving force transmitting mechanism so that the mechanism is switched to engage with the pickup, while the pickup is moved to the outer peripheral direction. The movement of the pickup is transmitted to the disk holding mechanism, the disk is held on the turntable, the driving force transmitting mechanism and the pickup are engaged by the operation of the operation switching mechanism, while the pickup is moving to the outer peripheral direction, and the disk is released from the turntable. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a disk recording / reproducing apparatus that performs recording / reproduction of, for example, a compact disk.

  Conventionally, as this type of known disk reproducing apparatus, a disk is pressed against a turntable with a movable pressing member, and the disk is held on the turntable by a frictional force generated by the pressing force, or a manual or detachable mechanism By aligning the disc center hole with the turntable's fitting part and forcibly pressing it, a plurality of protrusions engage and urge the edge of the disc center hole to hold the disc on the turntable. In addition, there are known ones in which an external force is applied to the disk to forcibly remove it (see, for example, Patent Document 1).

  Hereinafter, a conventional disk recording / reproducing apparatus described in JP-A-8-180565 will be described with reference to FIG. 11A and 11B are schematic views showing the configuration of the disk holding mechanism of such a conventional disk recording / reproducing apparatus, where FIG. 11A is a plan view thereof, and FIG. 11B is a disk recording / reproducing state (protrusion progression) while holding the disk. (C) is a cross-sectional view showing a standby state (projection retreat) before holding the disk. In FIG. 11, reference numeral 24 denotes a turntable that holds and rotates a disk (not shown) stationary on the disk positioning portion 29.

  Reference numeral 25 denotes a protrusion provided radially around the disk positioning portion 29 of the turntable 24 that fits with the inner edge of the disk center hole, and 26 is a detachable member, and 26 is a detachable member. The shaft member 30 is inserted into the long hole of the turntable 24 so as to be set to be rotatable by a predetermined rotation angle with respect to the turntable 24, and has an engaging portion that protrudes from the periphery of the turntable 24 and rotates it. It is a detachable member.

Next, the operation of the conventional disc recording / reproducing apparatus will be described with reference to FIG. First, when the turntable 24 is rotating forward, when a stopper (not shown) configured integrally with the pickup is approached from the right side of the drawing and engaged with each other at a position closest to the engaging portion of the detachable member 26. Thus, the protrusion 25 is advanced to hold the disk, and when the turntable 24 is rotated in reverse, the engaging portion of the detachable member 26 is engaged with the pickup stopper from the opposite direction so that the protrusion 25 can be retracted. The holding of the disc can be released.
JP-A-8-180565

  However, in the configuration using the pressing member as in the first prior art described above, the pressing member or an external force in the vertical direction for pressing the pressing member against the turntable is required, and the pressing member mounts and removes the disc in the apparatus. In order to do so, there was a problem of requiring a moving space.

  Further, in the configuration in which the disk is held by the protrusion of the turntable fitting portion according to the above-described conventional technique, an external force for forcibly mounting / dismounting the disk is required, and the disk is warped when being mounted / removed. Therefore, since a long stroke is required in the vertical direction, it is necessary to provide a large space in the apparatus, and there is a problem that mounting of the disk tends to be uncertain.

  Further, in the structure described in the above-mentioned Japanese Patent Application Laid-Open No. 8-180565, the protrusion 25 is moved back and forth by the rotating operation of the disk. In some cases, the disk may come into contact with the recording surface of the disk. In such a case, there is a problem that a wide range of scratches may occur on the disk, which may hinder recording and reproduction.

  The present invention has been made in order to solve the above-described conventional problems, and does not require any special external force when the disc is mounted / removed and when the disc is recorded / reproduced. An object of the present invention is to provide a disc reproducing apparatus capable of reliably holding a disc without causing scratches.

  The disc recording / reproducing apparatus according to the present invention transmits the driving force to the disc holding mechanism of the turntable by the power transmission mechanism using the normal movement operation of the pickup as a driving source, and holds the disc on the turntable by the operation. The holding is released.

  According to the present invention, there is no need for a pressing member, an external force for pressing the pressing member against the turntable, a space for loading and unloading the disc by the pressing member, and the like, and the disc can securely hold the disc. A recording / reproducing apparatus is obtained.

  The disc recording / reproducing apparatus according to the present invention is provided with an operation switching mechanism for switching between a disc holding operation and a disc releasing operation of a power transmission mechanism that transmits the driving force of the pickup to the disc holding mechanism. As a result, both the holding and releasing operations of the disc can be performed by the operation within the normal operating range of the pickup, so that a disc recording / reproducing apparatus capable of mounting and dismounting the disc in a narrow space is obtained.

  Further, the disc recording / reproducing apparatus according to the present invention does not require the turntable to rotate as the disc holding mechanism, and the disc is placed on the turntable by the projection that operates in response to the operation of the power transmission mechanism accompanying the movement of the pickup. It is intended to be retained.

  According to the present invention, the projection is moved forward and backward using other external forces such as a driving force during the movement of the pickup, and the projection is fitted to the inner edge of the center hole of the disc. The disc can be held and released without causing damage to the disc mounted on the turntable without causing damage to the disc. A device is obtained.

(Embodiment of the Invention)
The disc recording / reproducing apparatus of the present invention has a turntable provided with turntable cam grooves radially about a rotation axis, and rotates with respect to the turntable about an axis substantially concentric with the rotation axis of the turntable. A cam member including a cam member cam groove having a portion that can be fitted to the turntable and has a shorter distance from the central axis along the rotation direction; the turntable cam groove; and the cam member cam groove A projection having a projection cylindrical portion that engages with a center hole of a disc to be recorded and reproduced and holds the disc on the turntable, the turntable, and the cam member Urging means for urging the cam member in one rotation direction with respect to the turntable, and the turntable rotates the turntable to a predetermined position. A turntable positioning portion for restricting, the cam member having a cam member engaging portion for rotating the cam member, and contacting the turntable positioning portion to restrict the turntable to a predetermined position; And a pressing member that presses the cam member and rotates the cam member so that the protrusion is advanced and retracted without requiring rotational positioning of the turntable. The disc can be held and released, and the disc can be easily mounted and removed, and the disc can be held without causing scratches that hinder the recording and playback of the disc. Has an effect.

  Also, the disc recording / reproducing apparatus of the present invention is provided with a movable pickup having a protrusion, a first engagement portion and a second engagement portion engageable with the protrusion, and the protrusion and the first When the engagement portion is engaged, the movement is possible in one direction in conjunction with the movement of the pickup, and when the protrusion and the second engagement portion are engaged, the other direction is associated with the movement of the pickup. And a power output member that moves in conjunction with the movement of the power input member, wherein the pressing member is provided on the power output member, and the movement of the pickup By holding and releasing the disk on the turntable using the operation as a drive source, there is an effect that the disk can be mounted in a space-saving manner without requiring any special external force.

  The present invention is configured as described above, and in particular, does not require pressing from the recording surface direction of the disk, and does not require the rotational positioning of the turntable to hold and release the disk by moving the protrusions back and forth. By doing so, it is possible to provide a disc recording / reproducing apparatus that can easily attach and detach a disc and can hold the disc without causing scratches that impede recording and reproduction of the disc.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings and FIGS. FIG. 1 is a schematic diagram showing the configuration of a disk recording / reproducing apparatus according to a first embodiment of the present invention, where (A) is a plan view, (B) is a side view, and FIG. 2 is a disk holding shown in FIG. It is a figure which shows the detailed structure of a mechanism, (A) is a top view which shows the standby state (projection retraction) before a disk holding | maintenance, (B) is AA cross section of the disk holding mechanism shown to FIG. 2 (A). FIGS. 3A and 3B are diagrams showing a detailed configuration of the disk holding mechanism shown in FIG. 1, and FIG. 3A shows a disk holding mechanism in which a disk is held and in a disk recording / reproducing state (protrusion progression) (disk omitted). FIG. 3B is a sectional view of the disk holding mechanism shown in FIG.

4 is a plan view showing a detailed configuration of the power transmission mechanism shown in FIG. 1 in a standby state before holding the disk, and FIG. 5 is a diagram showing a state in which the disk of the power transmission mechanism shown in FIG. FIG. 6 is a plan view showing a detailed configuration of the operation switching mechanism shown in FIG. 1 during release of the disk holding, and FIG. 7 is a plan view showing the operation switching mechanism shown in FIG. FIG. 8 is a plan view showing a detailed configuration, FIG. 8 is a plan view showing a (projection retreat) configuration in an initial state of the operation of the disk recording / reproducing apparatus shown in FIG. 1, and FIG. 9 is a disk recording of the disk recording / reproducing apparatus shown in FIG. FIG. 10 is a schematic view showing the configuration of a disk recording / reproducing apparatus according to the second embodiment of the present invention, and FIG. Sectional view showing a standby state (projections retraction) of, (B) is a cross-sectional view of holding the disk in the disk recording and reproducing state (projections progress) (disk shown) disk holding mechanism.
(First embodiment)
With reference to FIG. 1 to FIG. 7, the configuration of the disc recording / reproducing apparatus in the first embodiment of the present invention will be described in detail. First, in FIGS. 1A and 1B, reference numeral 1 denotes a disk recording / reproducing apparatus, which includes a turntable 2 on which a disk 10 (FIG. 3B) is mounted, a turntable driving motor 3, and a disk. 10, a pickup 4 that performs writing / reproduction, a pickup driving motor 5, and a lead screw 6 that transmits the driving force of the pickup driving motor 5 to the pickup 4.

  Further, the disk recording / reproducing apparatus 1 includes a power transmission mechanism 7 (discussed later with FIG. 4 as an example) for loading and unloading the disk, and a gear train 8 for transmitting the driving force of the pickup driving motor 5 to the lead screw 6. The disk holding mechanism 31 (which will be described later with reference to FIGS. 2 and 3 as an example) holds the disk 10 mounted on the turntable 2, and the power transmission mechanism 7 when the disk is held and when the disk is loaded / unloaded. An operation switching mechanism 33 (which will be described later with reference to FIGS. 6 and 7 as an example) and a base 9 on which these components are mounted.

  In such a configuration, the driving force of the pickup driving motor 5 that is turned on / off by the control of a device (not shown) is transmitted to the lead screw 6 through the gear train 8 of an appropriate configuration, and the lead screw 6 is rotated. The pickup 4 is moved. Although the gear train 8 relaying from the pickup drive motor 5 to the lead screw 6 is not specifically shown in FIG. 1, the gear train 8 having any configuration may be used. In this embodiment, an example in which the pickup 4 is moved from the pickup driving motor 5 via the lead screw 6 is shown. However, other structures such as a structure using a rack and a pinion or a structure using a linear motor are available. Any structure can be realized in the same manner.

  Next, the configuration of the disc holding mechanism 31 of the disc recording / reproducing apparatus 1 shown in FIG. 1 will be described in detail with reference to FIGS. 2 (A) and 2 (B) and FIGS. 3 (A) and 3 (B). To do. In the figure, a disk holding mechanism 31 is always provided with a turntable 2, a cam member 11 that rotates and advances a protrusion 13 in the radial direction (inner or outer circumferential direction) of the turntable 2 to hold the disk 10. A spring 12 that urges the cam member 11 in the clockwise direction, and a protrusion 13 that holds the disk 10 by pressing it toward the inner peripheral edge of the center hole of the disk 10 mounted on the turntable 2 in the outer peripheral direction. .

  In such a configuration, the turntable 2 is further fitted with the inner edge of the center hole of the disk 10 to position the disk 10, and the plan view has a triangular shape. The turntable 2 is positioned and fixed at a predetermined position in order to be attached to and detached from the mounting table (details will be described later), and turntable positioning portions 2B and protrusions 13 that hold the disk 10 on the turntable 2 are radially (outer circumferential direction). The cam groove 2C for fitting the cylindrical portion 13A of the projection 13 to be advanced or retracted, and the cylindrical portion 11B of the cam member 11 are fitted so that the cam member 11 can be rotated by a predetermined rotation angle with respect to the turntable 2. And a cam groove 2D.

  Further, the cam member 11 is fitted with the cylindrical portion 13A of the protrusion 13 that holds the disk 10 on the turntable 2, and the protrusion 13 is moved when the cam member 11 is rotated with respect to the turntable 2 by a predetermined rotation angle. A cam groove 11A that advances radially (peripheral direction) and a cam groove 2D of the turntable 2 are fitted into a cam groove 2D and pressed against the spring 12 by a taper 14A (described later in FIG. 4). In the example shown in the figure, it has a plurality of columnar portions 11B that hold the cam member 11 in its position, and the cam member 11 is concentric with the turntable 2 at a predetermined angle. Configured to only pivotably fit. Further, in the example shown in the figure, the cam member 11 is urged clockwise with respect to the turntable 2 by the spring 12, and at that time, the protrusion 13 is configured to advance in the radial direction (peripheral direction).

  Further, the protrusion 13 engages with the cam groove 11 </ b> A of the cam member 11 and also with the cam groove 2 </ b> C of the turntable 2, and when the cam member 11 rotates clockwise by the spring force of the spring 12. The disk 10 has a cylindrical portion 13A that moves radially along the cam groove 11A in the outer circumferential direction of the cam member 11, thereby engaging the protrusion 13 with the inner edge of the center hole of the disk 10, thereby making the disk 10 turntable 2. To keep on.

  In this way, the protrusion 13 is advanced and retracted by the rotation of the cam member 11. Further, the position of one side of the turntable positioning portion 2B in the present embodiment or the predetermined position for positioning the turntable 2 is when the power output member 14 (described later in FIG. 4) moves to the right in FIG. This is the position held by the upper part of the taper 14A. Further, when the taper 14A moves to the right in FIG. 1, the cam member 11 is set at a position where the inclined portion of the taper 14A can press the cylindrical portion 11B to rotate the cam member 11 counterclockwise.

  Next, the configuration of the power transmission mechanism 7 of the disc recording / reproducing apparatus 1 shown in FIG. 1 will be described in detail with reference to FIGS. 4 and 5, the power transmission mechanism 7 includes a power input member 15 and a power output member 14 that transmit movement or power of the pickup 4 to the turntable 2, and the write / reproduce state of the disc recording / reproducing apparatus 1. And a biasing member 16 that acts to exclude the pickup engaging portion 15B provided on the power input member 15 from the four moving regions.

  The power output member 14 positions and rotates the turntable positioning portion 2B (holds for rotating the cam member 11) and holds the cam member 11 in the counterclockwise direction when the disk is mounted and removed. The taper 14 </ b> A that enables the disk to be mounted and removed, the long hole 14 </ b> B, and the round hole 14 </ b> C are fitted into the shaft member 9 </ b> A provided in the base 9. The power input member 15 includes pickup engaging portions 15A and 15B that are engaged with the pickup 4, and a biasing portion that abuts against a biasing member (for example, a plate spring or the like, which may be any other elastic member). 15C, and a shaft member 15D provided therein is fitted in the long hole 9B of the base 9 and is rotatably fitted in the round hole 14C of the power output member 14.

  A shaft member 15 </ b> E provided on the power input member 15 is fitted in the cam groove 9 </ b> C of the base 9. One end of the biasing member 16 is fixed to the base 9, and the other end is engaged with the biasing portion 15C of the power input member 15 when the power input member 15 moves to the left in FIGS. The power input member 15 is set to a position where the power input member 15 is rotated by being urged clockwise around the shaft member 15E.

  Next, the configuration of the operation switching mechanism 33 of the disc recording / reproducing apparatus 1 shown in FIG. 1 will be described in detail with reference to FIGS. 6 and 7, in the present embodiment, the operation switching mechanism 33 is given by power from a power source (for example, a motor, a solenoid, etc. used for other devices) outside the disk recording / reproducing apparatus 1. The rotating member 17 includes a protrusion 17A that receives an external force.

  The rotating member 17 is rotatably fitted to a shaft member 9D provided on the base 9, and the left end of the rotating member 17 is engaged with the shaft member 15E of the power input member 15. Further, the pickup engaging portions 15A and 15B of the power input member 15 are configured to engage with the protrusion 4A of the pickup 4 in operation (details will be described later).

  Next, the operation of the disc recording / reproducing apparatus configured as described above will be described with reference to FIGS. 8 and 9 in addition to FIGS.

  First, the operation from the standby state before holding the disk to the disk holding state for recording / reproducing the disk will be described. FIG. 8 shows a standby state, in which the pickup 4 is on the outer peripheral side of the disk. At that time, as shown in FIG. 8, the engaging portion 15B of the power input member 15 engages with the protrusion 4A of the pickup 4 and moves to the right in the drawing, so that the power output member 14 is moved to the inner peripheral side of the disc. That is, it moves to the right in the figure and waits there. At that time, as shown in FIG. 4, the taper 14 </ b> A contacts one side of the triangle of the turntable positioning portion 2 </ b> B provided on the turntable 2 to restrict the rotation of the turntable 2 and to rotate the cam member 11 counterclockwise. The disc can be inserted and removed.

  In this manner, the rotation of the turntable 2 is restricted so as not to move, and the cylindrical portion 11B of the cam member 11 is pressed by the inclined surface of the taper 14A, so that the cam member 11 is counterclockwise with respect to the turntable 2. , The cylindrical portion 13A is drawn toward the center of the turntable 2 along the cam groove 11A, and the protrusion 13 is retracted toward the center to restrict the advance in the disk outer circumferential direction. As a result, the protrusion 13 is accommodated in the disk positioning portion 2 </ b> A provided on the turntable 2. In this state, the disc 10 can be mounted on the turntable 2 by fitting the inner edge of the center hole of the disc 10 to the disc positioning portion 2 </ b> A provided on the turntable 2. In the present embodiment, the inclined surface of the taper 14A is inclined at the entire surface of the tip. However, the cylindrical portion 11B may be positively pressed by flattening a part of the tip. .

  Next, when the sensing means (not shown) senses that the disc 10 is mounted on the turntable 2, the pickup 4 moves in the inner peripheral direction of the disc 10 (left direction in the figure). As shown in FIGS. 5, 7, and 9, the protrusion 4 </ b> A provided on the pickup 4 engages with a pickup engaging portion 15 </ b> A provided on the power input member 15, and applies a driving force of the pickup 4 thereto. 5, 7, and 9, the shaft members 15 </ b> D and 15 </ b> E of the power input member 15 are driven by using the long hole 9 </ b> B provided in the base 9 and the long hole portion of the cam groove 9 </ b> C as a guide. The input member 15 is moved to the left in FIG.

  By this operation of the power input member 15, the shaft member 9A of the base 9 fitted in the long hole 14B (FIGS. 5 and 9) provided in the power output member 14 is used as a guide to input the power output member 14 to the power input. It moves in the same left direction as the member 15. When the power output member 14 moves to the left in FIGS. 5 and 7, the restriction on the cylindrical portion 11B of the cam member 11 by the taper 14A of the power output member 14 is released (FIG. 3). Therefore, the cam member 11 rotates in a clockwise direction concentric with the turntable 2 by the bias of the spring 12 against the cam member 11.

  When the cam member 11 rotates in the clockwise direction, the columnar portion 13A provided on the projection 13 is slid by the cam groove 11A of the cam member 11 as a guide, and a radial force is exerted in the outer peripheral direction of the disk positioning portion 2A of the turntable 2. The cam groove 2C provided in the turntable 2 is used as a guide to advance from the disk positioning portion 2A in the outer circumferential direction. Therefore, the protrusion 13 engages with the inner edge of the center hole of the disk 10 to hold the disk 10 on the turntable 2.

  Further, when the pickup 4 moves in the inner circumferential direction of the disk (for example, the left direction in FIGS. 5 and 9), the taper 14A provided on the power output member 14 and the turntable positioning portion 2B provided on the turntable 2 are engaged. 5 and 9, the shaft member 15E provided on the power input member 15 moves to the cam portion at the lower left end of the cam groove 9C provided on the base 9, and the power input member 15 When the urging portion 15C provided on is engaged and urged by the urging member (plate spring) 16, the power input member 15 rotates clockwise about the shaft member 15D. The pickup engaging portion 15 </ b> B provided on the power input member 15 is retracted from the movement path of the protrusion 4 </ b> A of the pickup 4.

  As a result, as shown in FIGS. 5 and 9, the shaft member 15E provided on the power input member 15 is engaged with the left end of the rotating member 17, and the rotating member 17 is rotated counterclockwise around the shaft member 9D. Then, it comes into contact with a stopper 9E provided on the base 9 and stops. Then, when the shaft member 15E enters the lower left portion of the cam groove 9C, the power input member 15 and the power output member 14 are held in the left direction in the drawing, that is, in the disk holding state or the disk recording / reproducing state.

  Secondly, the operation of the disk recording / playback apparatus 1 during disk recording / playback will be described. FIG. 9 shows a disk recording / reproducing operation state. In this state, as shown in FIG. 2, the restriction of the taper 14 </ b> A provided on the power output member 14 with respect to the turntable positioning portion 2 </ b> B provided on the turntable 2 is completely released, and the turntable 2 is connected to the turntable driving motor 3. It becomes possible to rotate. Further, as shown in FIGS. 5, 7, and 9, the power input member 15 is biased by a biasing member 16 provided on the base 9.

  In this state, the pickup 4 moves to the inner disc side or the outer disc side for recording and reproduction. However, since the pickup engaging portion 15B provided on the power input member 15 is retracted from the movement path of the protrusion 4A of the pickup 4, the pickup engaging portions 15A and 15B provided on the power input member 15 are separated from each other. There is no engagement above. In this state, the turntable 2 rotates, and the pickup 4 can be moved to record / reproduce the disk 10.

  Next, the operation from the disc recording / reproducing operation to the release of the disc holding will be described. During the disk recording / reproducing operation, the turntable 2 is rotated by the turntable driving motor 3, and the pickup 4 exists at an arbitrary position within the movable range. When a command to stop the disk recording / reproducing operation is received from a control means (not shown), the turntable driving motor 3 stops and the rotation of the turntable 2 stops at an arbitrary position. Subsequently, the pickup 4 is moved to the inner circumference side of the disc and stopped at the innermost circumference (for example, the position shown in FIG. 5).

  Next, at the position shown in FIG. 9, an external force opposite to the urging direction (counterclockwise direction) by the urging member 16 is applied to the protrusion 17A provided on the rotating member 17 as the operation switching mechanism 33. The rotating member 17 is rotated clockwise around the shaft member 9D. As a result, the shaft member 15E engaged with the left end of the rotating member 17 moves upward to rotate the power input member 15 in the counterclockwise direction, and the pickup engaging portion 15B is moved in the movement path of the protrusion 4A of the pickup 4. Lift to return. The external force applied to the protrusion 17A of the rotating member 17 uses power from a power source (for example, a motor or solenoid used for other devices) outside the disk recording / reproducing apparatus.

  Next, when the pickup 4 moves in the disk outer circumferential direction, the protrusion 4A provided on the pickup 4 engages with the pickup engaging portion 15B provided on the power input member 15, and the power input member 15 and the power output member 14 are illustrated. Move to the right of 9. As a result, the taper 14A of the power output member 14 engages with the turntable positioning portion 2B to position and hold the turntable 2, and restricts its movement so that it cannot rotate.

  Next, the taper 14 </ b> A engages with the cylindrical portion 11 </ b> B provided on the cam member 11, thereby rotating the cam member 11 in the clockwise direction with respect to the turntable 2, whereby the protrusion 13 becomes the disk positioning portion of the turntable 2. 2A, the movement of the pickup 4 is stopped. In this state, by lifting the disk 10 from the turntable 2, the release of the disk holding is completed. The state at this time is the same as the standby state before holding the disk.

  In the first embodiment of the present invention described above, the first component transmits the driving force of the pickup 4 to the turntable 2 by the power transmission mechanism 7, and the disk is held by the disk holding mechanism 31 that receives the operation. 10 is a component that holds 10 on the turntable 2 and releases the hold.

  The second component uses an operation switching mechanism (rotating member 17) 33 having a protrusion 17A that receives external power, and when releasing the holding of the disk 10, an external force is applied to the protrusion 17A to provide a power input member 15. The pickup engaging portion 15B is moved to a state where the pickup engaging portion 15B and the protrusion 4A of the pickup 4 can be engaged, and the power transmission mechanism 7 is switched from the disk holding state to the standby state.

  The third component is not a mechanism for pressing and holding the disk from the recording surface direction, but a protrusion 13 that engages with the cam member 11 is provided on the turntable 2 as the disk holding mechanism 31 in the first component. In this configuration, the advance / retreat is performed by using, for example, the operation of the pickup 4 without using the rotation of the turntable 2.

The fourth component transmits the driving force of the pickup 4 as the power transmission mechanism 7 in the first component to the turntable 2 using the power input member 15 and the power output member 14 in this embodiment. In the component that holds and releases the disk by rotating and positioning and holding the turntable 2 and rotating only the cam member 11 without rotating the turntable 2 and moving the protrusion 13 forward and backward. is there.
(Second Embodiment)
Next, a disk recording / reproducing apparatus according to the second embodiment of the present invention will be described in detail with reference to FIG. In the second embodiment, the disk holding mechanism 35 of the disk recording / reproducing apparatus is configured to be different from the disk holding mechanism 31 in the first embodiment. First, the configuration of the disk holding mechanism 35 will be described with reference to FIG.

  Components other than the disc holding mechanism 35 of the disc recording / reproducing apparatus in the second embodiment, that is, the pickup 4, the power output member 14, the power input member 15 and the like are the same as those shown in FIGS. It is a thing. However, as a different part, the power output member 14 in the first embodiment is provided with a taper 14A for positioning the turntable 2 and rotating the cam member 11, but in the second embodiment. The power output member 14 is not provided with a taper 14A, but differs in that a taper 14D having an inclined surface that engages with the power conversion member 18 and moves it vertically is provided.

  Further, the disk holding mechanism 35 in the present embodiment is arranged in the vertical direction inside the turntable 2 instead of the cam member 11, the spring 12, and the protrusion 13 of the disk holding mechanism 31 in the first embodiment. A power conversion member 18 that moves to the power conversion member 18, a projection 19 that contacts the power conversion member 18 with a tapered surface, a fixing plate 20 that restrains the vertical movement of the projection 19, and the power conversion member 18 by the fixing plate 20. A spring 21 biased in the vertical direction is incorporated. Further, the power conversion member 18 is provided with a protrusion that engages with the tapered portion 14 </ b> D of the power output member 14.

  Next, the operation of the disc recording / reproducing apparatus in the second embodiment of the present invention configured as described above will be described in detail with reference to FIG. First, in the standby state, the power conversion member 18 is urged downward by the spring 21 in a state where the power conversion member 18 is pushed up by the tapered portion 14D of the power output member 14 (FIG. 10A). Here, when the pickup 4 moves in the inner circumferential direction of the turntable 2, the power output member 14 moves in the outer circumferential direction in conjunction therewith. At this time, the power conversion member 18 moves downward along the inclined surface of the taper 14 </ b> D of the power output member 14.

  However, at this time, since the protrusion 19 is constrained in the vertical direction by the turntable 2 and the fixing plate 20, the protrusion 19 advances along the tapered surface and abuts against the inner edge of the center hole of the disk 10. The disk 10 is held. When the disc 10 is held on the turntable 2, the power output member 14 is retracted to a position where it does not interfere with the power conversion member 18 and the pickup 4 as in the case of the first embodiment. Thereby, the disk holding mechanism 35 is in the state shown in FIG.

  When releasing the holding of the disk 10, the retracted power input member 15 is engaged with the pickup 4, and the power conversion member 18 is pushed up by the inclined surface of the taper 14 </ b> D of the power output member 14 to project the protrusion 19. Is moved in the direction of the center of the turntable 2 in the opposite direction to the disk holding state, thereby retracting the protrusion 19 and releasing the holding of the disk 10. As a result, the disk holding mechanism 35 returns to the state shown in FIG.

  In this way, the disc can be held / released without rotating the turntable when holding and releasing the disc, so that the disc can be recorded without causing damage to the disc that would interfere with recording and reproduction. Can be held. Further, when the disk is held and released, the disk can be held without requiring a special turntable 2 positioning mechanism.

  According to the present invention, the protrusion can be moved forward and backward without the need for rotational positioning of the turntable to hold and release the disk, so that the disk can be easily mounted and removed, and the disk can be recorded and reproduced. Since the disc can be held without causing any troubles, it is useful for a disc recording / reproducing apparatus for recording / reproducing a compact disc, for example.

BRIEF DESCRIPTION OF THE DRAWINGS It is the schematic which shows the structure of the disc recording / reproducing apparatus in the 1st Embodiment of this invention, (A) is a top view, (B) is a side view It is a figure which shows the detailed structure of the disk holding mechanism shown in FIG. 1, (A) is a top view which shows the standby state (projection retreat) before disk holding, (B) is the disk holding mechanism shown in FIG. AA sectional view It is a figure which shows the detailed structure of the disc holding mechanism shown in FIG. 1, (A) is a top view of the disc holding mechanism which hold | maintains a disc and is in a disk recording / reproducing state (protrusion progress) (disk abbreviation). Is a sectional view of the disk holding mechanism shown in FIG. The top view which shows the detailed structure in the standby state before the disk holding | maintenance of the power transmission mechanism shown in FIG. FIG. 1 is a plan view showing a detailed configuration of the power transmission mechanism shown in FIG. The top view which shows the detailed structure in the time of cancellation | release of the disk holding | maintenance of the operation switching mechanism shown in FIG. The top view which shows the detailed structure in the disk recording / reproducing state of the operation switching mechanism shown in FIG. The top view which shows the structure (projection retreat) in the initial state of operation | movement of the disc recording / reproducing apparatus shown in FIG. The top view which shows the (projection progress) structure at the time of the disk recording / reproducing operation of the disk recording / reproducing apparatus shown in FIG. It is the schematic which shows the structure of the disc recording / reproducing apparatus in the 2nd Embodiment of this invention, Comprising: (A) is sectional drawing which shows the standby state (projection retraction) before disc holding (B) is holding a disc Sectional view of the disc holding mechanism in the disc recording / reproducing state (protrusion progression) (disc omitted) It is the schematic which shows the structure of the disk holding | maintenance mechanism of the conventional disk recording / reproducing apparatus, Comprising: (A) is a top view, (B) is sectional drawing which shows a disk recording / reproducing state (protrusion progress) holding a disk (C) ) Is a sectional view showing the standby state (protrusion retreat) before holding the disk

Explanation of symbols

2 Turntable 2A Disk positioning part 2B Turntable positioning part 2C, 2D Cam groove 3 Main table drive motor 4 Pickup 4A Projection 5 Pickup drive motor 6 Lead screw 7 Power transmission mechanism 8 Gear train 9 Base 9A Shaft 9B Long hole 9C Cam groove 10 Disc 11 Cam member 11A Cam groove 11B, 13A Cylindrical part 12 Spring 13 Projection 14 Power output member 14A Taper 14B Long hole 14C Round hole 14D Taper 15 Power input member 15A, 15B Pickup engaging part
15C Energizing portion 15D, 15E Shaft material 16 Energizing member (leaf spring)
Reference Signs List 17 Rotating member 17A Protrusion 18 Power conversion member 19 Protrusion 20 Fixing plate 21 Spring 22 Disc holding mechanism 23 Disc 24 Turntable 25 Protrusion 26 Detachment member 28 Pickup 29 Disc positioning portion 30 Shaft material 31 Disc holding mechanism 33 Operation switching mechanism 35 Disk holding mechanism

Claims (2)

A turntable having turntable cam grooves radially about the rotation axis;
A portion that is fitted to the turntable so as to be rotatable with respect to the turntable about a center axis that is substantially concentric with the rotation axis of the turntable, and the distance from the central axis decreases along the rotation direction. A cam member having a cam groove having a cam member;
A projection provided with a projection cylindrical portion that engages movably with the turntable cam groove and the cam member cam groove, and engages with a center hole of a disc to be recorded and reproduced to hold the disc on the turntable. Things,
A biasing means that engages with the turntable and the cam member and biases the cam member in one rotation direction with respect to the turntable;
The turntable includes a turntable positioning portion for restricting the rotation of the turntable to a predetermined position, and the cam member includes a cam member engaging portion for rotating the cam member,
Disc recording / reproducing having a pressing member provided with an abutting portion that abuts on the turntable positioning portion and restricts the rotation of the turntable to a predetermined position and a pressing portion that presses the cam member and rotates the cam member apparatus. A movable pickup with a protrusion;
A first engagement portion and a second engagement portion that are engageable with the protrusion are provided, and when the protrusion is engaged with the first engagement portion, the protrusion is moved in one direction in conjunction with the movement of the pickup. A power input member that is movable and movable in the other direction in conjunction with the movement of the pickup when the projection and the second engagement portion are engaged;
A power output member that moves in conjunction with the movement of the power input member;
The disk recording / reproducing apparatus according to claim 1, wherein the pressing member is provided on the power output member.

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