JP3059640B2 - Disc clamp mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk clamp mechanism in a disk reproducing apparatus for reproducing a compact disk or the like.

[0002]

2. Description of the Related Art A conventional disk clamp mechanism in a disk reproducing apparatus will be described with reference to FIG. 4A is a plan view showing a configuration of a conventional disk clamp mechanism, and FIG. 4B is a right side view of FIG. 4 (a) and 4 (b), the conventional disk clamp mechanism is provided with a shaft 7 provided substantially horizontally with respect to the table surface 41 of the base 4 and a rotatably supported shaft around the shaft 7. A clamper arm 1, a clamper 2 provided at the tip of the clamper arm 1, a turntable 9 rotating about an axis substantially perpendicular to a table surface 41 of the base 4, and a turntable provided inside the base 4. A motor 10 for rotating the table 9 in a predetermined direction at a predetermined speed, a pickup 3 sliding on an opening groove 11 provided on a table surface 41 of the base 4 in a radial direction with respect to a rotation axis of the turntable 9, A first biasing member 5 such as a tension spring, which is provided between the base 4 and the clamper arm 1 and biases the clamper arm 1 in the clamping direction, and the clamper arm 1 is attached in one direction parallel to the shaft 7. Pulling force A second biasing member 6, such as a spring, and a holding member 8 and the like to be fitted holding the clamper arm 1 in the axial.

In the conventional disk clamp mechanism having the above-described structure, when inserting or removing a disk, the clamper 2 and the clamper arm 1 are rotated above the turntable 9 (for example, by rotating clockwise in FIG. Clamper 2
And the turntable 9 is wide open to facilitate insertion and removal of the disk. On the other hand, at the time of reproducing the disc, the disc is pressed against the turntable 9 via the clamper arm 1 and the clamper 2 by the first urging member 5. Further, in order to prevent the occurrence of sound skipping due to rattling of the disk or the clamper arm 1 due to external vibration or the like, the clamper arm 1 and the clamper 2 are moved in one direction parallel to the shaft 7 by the second urging member 6. , The backlash in the direction of the shaft 7 is regulated, and the disk is clamped between the clamper 2 and the turntable 9. Playback on the disc player
The operation is performed by driving the motor 10 to rotate the turntable 9, irradiating the recording surface of the disk from the pickup 3 with light, and detecting the intensity difference of the reflected light from the disk. The entire surface of the disc is reproduced by moving the pickup 3 in the radial direction of the opening groove 11 of the base 4.

[0004]

However, in the conventional disk clamp mechanism having the above structure, the first and second disc clamp mechanisms 1 and 2 are used to restrict the play of the clamper arm 1 and the clamper 2.
The urging members 5 and 6 are required, and as a result, the number of components constituting the disk clamp mechanism is large, the component shapes are complicated, and the assembling workability is poor. SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and has as its object to provide a disk clamp mechanism that can reduce play of a clamper arm or the like with a small number of parts and a simple configuration.

[0005]

In order to achieve the above object, a disk clamp mechanism according to the present invention comprises a base and a rotary shaft provided on a table surface of the base, the rotary shaft being substantially perpendicular to the table surface. A turntable, a pickup movable on the table surface of the base in a radial direction from a rotation axis of the turntable, and a shaft rotatable about a rotation axis substantially parallel to the table surface of the base. A supported clamper arm, a clamper provided near the tip of the clamper arm, and pressing and clamping a disc to the turntable from above the turntable;
The clamper arm is provided between the base and the clamper arm. The clamper arm is rotatably biased in a direction in which the clamper clamps the disk, and the clamper arm is moved in one direction parallel to a rotation axis thereof. a biasing member for biasing also to the biasing member includes a compression spring portion having a long free length by a predetermined length than the gap between the base and the clamper arm at the pivot shaft, said compression Two arm portions provided at both ends of a spring portion, wherein the compression spring portion is fitted on the outside of the rotation shaft, and the two arm portions are respectively the base and the clamper arm. To engage with
The base has a pair of vertical walls perpendicular to a table surface provided at a distance substantially equal to the span of the bearing portion of the clamper arm, and the pivot axis of the clamper arm is The second base is provided so as to protrude in the same direction on each of the walls, and does not interfere with the base in the first state in which the clamper arm is fitted on the rotation shaft, and the disk is inserted or removed in the second state. And a guide section for interfering with the clamper arm in the third state in which the disc is pressed against the turntable by the clamper and restricting the movement of the clamper arm in the direction of the rotation axis . In the above configuration, the pair of vertical walls are respectively provided above the table surface, and a notch is provided near one of the vertical walls of the table surface, and the vicinity of the rotation axis of the clamper arm of the notch is larger than other portions. The notch is also largely notched in the direction of the rotation axis, the guide portion is a convex portion provided on the edge of the other portion of the notch portion, and the clamper arm is provided with an abutting portion for abutting on the guide portion. Is preferred.

[0006]

According to the disk clamping mechanism of the present invention constructed as described above, the biasing member is urged by one urging member in the direction in which the clamper arm is clamped, and is also urged in one direction parallel to the rotation axis. As a result, the disc can be pressed against the turntable via the clamper, and the play in the axial direction of the clamper arm can also be regulated at the same time, thereby preventing deterioration of the vibration characteristics due to external vibration during reproduction of the disc. be able to. Further, as a biasing member, a compression spring portion having a free length longer by a predetermined length than a gap between the base and the clamper arm in the rotating shaft portion, and two compression spring portions provided at both ends of the compression spring portion, respectively. By using a special spring having both the function of a compression spring and the function of a torsion spring having an arm portion, a single urging member urges the clamper arm in a direction in which the clamper arm is clamped and is parallel to the rotation axis. It is possible to bias in one direction. Further, since a general compression spring manufacturing process can be used as it is, the manufacturing cost does not increase. Furthermore, the structure of the mounting portion of the biasing member is simplified by fitting the compression spring portion on the outside of the rotation shaft and engaging the two arms with the base and the clamper arm, respectively. Very easy to assemble. Further, a holding member or the like required to fit and hold the clamper arm on the rotation shaft, which is required in the conventional example, becomes unnecessary.

In addition, a pair of vertical walls perpendicular to the table surface are provided on the base at a distance substantially equal to the span of the bearing portion of the clamper arm, and the rotation axis of the clamper arm is moved from the pair of vertical walls to the respective vertical walls. Since the clamper arm is configured to protrude in the same direction, the clamper arm can be moved very easily by moving the clamper arm parallel to the rotation axis while holding the bearing of the clamper arm parallel to the rotation axis. It can be fitted on the rotation shaft. At this time, the biasing member is fitted to the one rotating shaft in advance, and when the clamper arm is fitted to the rotating shaft, the biasing member is automatically placed between the clamper arm and the base. Be attached. Furthermore, on the base, the first state in which the clamper arm is fitted on the rotating shaft does not interfere with the first state, and the second state in which the disk is inserted or removed and the third state in which the disk is pressed against the turntable by the clamper. The guide section is provided at a position where the guide section interferes with the clamper arm, so that the guide section restricts the movement of the clamper arm in the direction of the rotation axis against the urging force of the urging means, and the clamper arm comes off from the rotation axis. Never. In addition, a pair of vertical walls are respectively provided above the table surface, and a notch is provided near one of the vertical walls of the table surface. Simplify the structure of the disc clamp mechanism by providing a notch with a large notch and a convex part provided on the edge of the other part of the notch as a guide part, and providing a contact part in contact with the guide part on the clamper arm. Can be.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the disk clamp mechanism of the present invention will be described in detail with reference to FIGS. FIG. 1A is a plan view showing the configuration of a disk clamp mechanism in this embodiment, FIG. 1B is a right side view of FIG. 1A, and FIG. 1C is a left partial side view of FIG. FIGS. 2A and 2B are partially enlarged views of FIG.
FIG. 3 is a side sectional view (cross section taken along line XX of FIG. 1) showing the relationship between the contact portion of the clamper arm and the holding wall surface of the base.

As shown in FIG. 1, a disk clamp mechanism according to this embodiment includes a base 4 and a table surface 4 of the base 4.
1, a turntable 9 that rotates about a rotation axis substantially perpendicular to the table surface 41, and a motor that is provided on the back side of the table surface 41 of the base 4 and rotates the turntable 9 in a predetermined direction at a predetermined speed. 10 and table surface 41
A pickup 3 movable above an opening groove 11 provided in a radial direction from a rotation axis of the turntable, and a clamper rotatably supported on rotation axes 7a and 7b substantially parallel to the table surface 41. Arm 1 and clamper arm 1
And a clamper 2 provided between the base 4 and the clamper arm 1 for pressing a disk (not shown) against the turntable 9 from above the turntable 9 and clamping the disk. Are provided.

As shown in FIGS. 1 and 2, the urging member 5
Is a compression spring portion 5c having a free length that is longer by a predetermined length (slightly) than the gap between the vertical wall 4a of the base 4 and the vertical wall 1c of the clamper arm 1 near the rotation shaft 7b.
And two arms 5a and 5b provided at both ends of the compression spring portion, respectively, and the compression spring portion 5c is
And two arms 5a and 5b are engaged with a spring hook 4b of the base 4 and a spring hook 1b of the clamper arm 1, respectively. By the urging force of the urging member 5,
The clamper arm 1 is rotatably urged in a direction in which the clamper 2 clamps the disk (for example, counterclockwise in FIG. 1B), and the clamper arm 1 is parallel to its rotating shafts 7a and 7b. (In the direction indicated by the arrow S in FIG. 1A), the play of the clamper arm 1 in the directions of the rotating shafts 7a and 7b can be restricted, and even when external vibration is applied, Deterioration of the vibration characteristics due to the vibration of the clamper arm 1 is prevented, and good reproduction is possible.

The base 4 has a pair of vertical walls 4a and 4d perpendicular to the table surface 41 at a distance substantially equal to the span of the bearings 1d and 1e of the clamper arm 1 provided above the table surface 41. Have been. The rotating shafts 7a and 7b of the clamper arm 1 are connected to a pair of vertical walls 1d.
And 1e in the same direction (for example, FIG. 1 (a)
(In the direction indicated by the middle arrow S). Furthermore, one vertical wall 4 of the table surface 41 of the base 4
b, a notch 42 is provided in the vicinity of the rotation shaft 42a of the clamper arm.
The cutout is larger in the axial direction of the rotation shaft 7a than in 2b. A projection 4c is provided at the edge of the other portion 42b of the notch 42, and the projection 4c and the clamper arm 1
The guide portion 1a (shown in FIG. 3) provided in the first portion abuts to form a guide portion for restricting the movement of the rotating shafts 7a and 7b of the clamper arm 1 in the axial direction.

In FIG. 3, a dashed line 101 indicates a first state in which the bearing 1d of the clamper arm 1 is fitted on the rotating shaft 7a and the clamper arm 1 is mounted on the base 4.
3 shows a rotating state of the clamper arm 1. A dotted line 201 indicates a rotating state of the clamper arm 1 in the second state of inserting or removing a disk. A solid line 301 indicates the rotating state of the clamper arm 1 in a third state (actual use state) in which the disc is pressed against the turntable 9 by the clamper 2. FIG.
As is clear from FIG. 1, in the first state 101 when the clamper arm 1 is assembled, the contact portion 1a does not interfere with the convex portion 4c of the base 4 and is opposite to the arrow S shown in FIG. The bearings 1d and 1e of the clamper arm 1 can be fitted on the rotating shafts 7a and 7b in the directions. next,
After the contact portion 1a of the clamper arm 1 is moved to the left from the protrusion 4c, the clamper arm 1 is rotated to the position of the second state 201 shown in FIG.
, And the movement in the direction of arrow S can be restricted.
That is, according to the assembling method of the present embodiment, the urging member 5 is fitted on the rotation shaft 7b in advance, and the first state 101
In the state shown in FIG. 5, the bearings 1d and 1e of the clamper arm 1 are fitted on the rotating shafts 7a and 7b, respectively, and the clamper arm 1 is rotated to the second state 201 or the third state 301. The assembly is completed by a simple operation of engaging the arm 5b of the urging member 5 with the spring hook 4b of the base 4. Further, the holding member 8 for fitting and holding the clamper arm 1 to the rotating shafts 7a and 7b required in the conventional example shown in FIG. 4 becomes unnecessary.

[0013]

As described above, according to the disc clamping mechanism of the present invention, the biasing member is biased in the direction of clamping the clamper arm by one biasing member and is also biased in one direction parallel to the rotation axis. So that the disc can be pressed against the turntable via the clamper,
The play in the axial direction of the clamper arm can also be restricted at the same time, and deterioration of the vibration characteristics due to external vibration during reproduction of the disc can be prevented. Further, as a biasing member, a compression spring portion having a free length longer by a predetermined length than a gap between the base and the clamper arm in the rotating shaft portion,
By using a special spring having both a function of a compression spring and a function of a torsion spring having two arms provided at both ends of the compression spring portion, the clamper arm is clamped by one urging member. In the same direction as the rotation axis. Further, since a general compression spring manufacturing process can be used as it is, the manufacturing cost does not increase. Furthermore, the structure of the mounting portion of the biasing member is simplified by fitting the compression spring portion on the outside of the rotation shaft and engaging the two arms with the base and the clamper arm, respectively. Very easy to assemble. Further, a holding member or the like required to fit and hold the clamper arm on the rotation shaft, which is required in the conventional example, becomes unnecessary.

Further, a pair of vertical walls perpendicular to the table surface are provided on the base at a distance substantially equal to the span of the bearing portion of the clamper arm, and the rotation axis of the clamper arm is separately moved from the pair of vertical walls. Since the clamper arm is configured to protrude in the same direction, the clamper arm can be moved very easily by moving the clamper arm parallel to the rotation axis while holding the bearing of the clamper arm parallel to the rotation axis. It can be fitted on the rotation shaft. At this time, the biasing member is fitted to the one rotating shaft in advance, and when the clamper arm is fitted to the rotating shaft, the biasing member is automatically placed between the clamper arm and the base. Be attached. Furthermore, on the base, the first state in which the clamper arm is fitted on the rotating shaft does not interfere with the first state, and the second state in which the disk is inserted or removed and the third state in which the disk is pressed against the turntable by the clamper. The guide section is provided at a position where the guide section interferes with the clamper arm, so that the guide section restricts the movement of the clamper arm in the direction of the rotation axis against the urging force of the urging means, and the clamper arm comes off from the rotation axis. Never. In addition, a pair of vertical walls are respectively provided above the table surface, and a notch is provided near one of the vertical walls of the table surface. Simplify the structure of the disc clamp mechanism by providing a notch with a large notch and a convex part provided on the edge of the other part of the notch as a guide part, and providing a contact part in contact with the guide part on the clamper arm. Can be.

[Brief description of the drawings]

FIG. 1A is a plan view showing a configuration of a preferred embodiment of a disk clamp mechanism of the present invention, FIG. 1B is a right side view thereof, and FIG. 1C is a left side view thereof.

FIGS. 2A and 2B are partially enlarged views of FIG. 1A, respectively.

3 is a side sectional view showing a relationship between a contact portion of a clamper arm and a holding wall surface of a base (a sectional view taken along line XX in FIG. 1).

FIG. 4A is a plan view of a conventional disk clamp mechanism, and FIG. 4B is a right side view thereof.

[Explanation of symbols]

 1: clamper arm 1a: contact portion 1b: spring hook portion 1c: vertical wall 1d: bearing portion 1e: bearing portion 2: clamper 3: pick-up 4: base 4a: vertical wall 4b: spring hook portion 4c: convex portion 4d : Vertical wall 5: Urging member 5 a: Arm 5 b: Arm 5 c: Compression spring 7 a: Rotating shaft 7 b: Rotating shaft 9: Turntable 10: Motor 11: Opening groove 41: Table surface 42: Notch 101: first state 201: second state 301: third state

────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tetsuhiko Takeda 1006 Kazuma Kadoma, Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. (56) References JP-A-61-261849 (JP, A) JP-A-2-2 12645 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) G11B 17/028-17/035

Claims (2)

(57) [Claims] 1. A base, a turntable provided on a table surface of the base and rotating about a rotation axis substantially perpendicular to the table surface, and a rotation axis of the turntable on the table surface of the base. A pickup that can be moved in a radial direction from a clamper arm rotatably supported around a rotation axis substantially parallel to a table surface of the base, and a clamper arm that is provided near a tip end of the clamper arm, A clamper for pressing a disc against the turntable from above the turntable and clamping the disc; and a clamper provided between the base and the clamper arm, the clamper arm being rotatable in a direction in which the clamper clamps the disc. while energized, a biasing member that biases also the rotation axis one direction parallel to the clamper arm, the biasing member, the rotary shaft portion Base and clamper
Pressure with a free length longer than the gap with the
A compression spring portion, and a compression spring portion.
And the compression spring portion is provided on the rotating shaft.
And the two arms are respectively attached to the base.
And the clamper arm is configured to be engaged with the clamper arm, and the base is substantially equal to a span of a bearing portion of the clamper arm.
A pair of vertical surfaces perpendicular to the table surface
It has a straight wall, and the rotation axis of the clamper arm is
Provided on each of the vertical walls to project in the same direction
And the clamper arm is pivoted on the base.
Insert the disc without interference in the first state of fitting on the shaft
The second state and the clamper to remove the
In the third state where the disc is pressed against the turntable
Interferes with the clamper arm and is in front of the clamper arm
It is necessary to have a guide to regulate the movement in the direction of the rotation axis.
And a disk clamp mechanism. 2. A pair of vertical walls each correspond to a table surface.
Near the one vertical wall of the table surface
A notch portion, and a rotation axis of a clamper arm of the notch portion.
Notch near the rotation axis direction larger than other parts
And the guide part is the edge of the other part of the notch.
Are provided on the clamper arm.
2. The disc according to claim 1, further comprising: a contact portion that contacts the portion.
Lamp mechanism.