KR910005213Y1 - Pickup fixed device of disk type recording - Google Patents

Abstract

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Description

Pick-up feed screw installation mechanism of disc type record carrier

1 is a perspective view of a portion of a disc-shaped recording medium reproducing apparatus to which the present invention is applied.

2 is a bottom view of the pick-up feed screw installation mechanism according to the present invention.

3 is a cross-sectional view taken along line III-III of FIG. 2;

4 is a cross-sectional view of another embodiment of the present invention.

5 is a conventional pick-up feed screw installation mechanism and cross-sectional view.

* Explanation of symbols for main parts of the drawings

1: Disc-type recording medium playback device 6: Pickup

7 Substrate 15 Pickup Transfer Screw

18: rigid stopper 19: contact piece

20: leaf spring 21: bend

21a: one side 21 b: the other side

22: extension part 23: mounting screw

25: motor for transport

The present invention relates to a pickup feed screw mounting mechanism of a disc-type recording medium reproducing apparatus aimed at reducing the rotational load of the pickup feed screw and preventing movement in the start direction.

A reproducing apparatus for reading information recorded on a so-called disc type recording medium such as a compact disc (CD), while rotating the recording medium, irradiates a laser beam to the recording surface of the recording medium by picking up the information, and reflects the information based on the reflected light. To be read.

In this case, by continuously changing the inclination angle of the objective lens with the pickup fixed, the laser beam irradiation direction is continuously moved to the radially outer side of the recording medium, and when the movement amount reaches a certain value, 0.5 mm) radially outward (pitch feed), and the same operation is repeated.

The transfer operation of the pick-up in this type of regeneration device is performed by screwing a nut attached to a part of the pickup to the feed screw and rotating the feed screw by a fixed amount by a motor.

Therefore, managing the feed amount of the pickup with high accuracy is extremely important for increasing the reading accuracy of information, and any mechanism for installing the feed screw in the reproducing apparatus affects the feed accuracy of the pickup.

5 shows a conventional pick-up feed screw installation mechanism, in which a is a pick-up, and b is a pick-up feed screw b for transferring the pick-up a in the directions of arrows A and B. FIG.

One end of the feed screw b is received in the axial direction by the rigid stopper c, and the other end is disposed to face the contact piece d, and the contact piece d is pressed against the feed screw b by the leaf spring e to axially move the feed screw b. To regulate the movement.

In the disk-type recording medium reproducing apparatus, it is necessary to manage the transfer amount of the pickup with extremely high accuracy.

However, in the conventional pick-up feed screw installation mechanism, since the pick-up feed screw b is always pushed in the start direction by the leaf spring e, this pressing pressure acts as a factor that hinders the rotational movement of the pick-up feed screw b, and the feed screw As a result of the difficulty of managing the rotation amount of b with high accuracy, there has been a problem that the management of the high accuracy of the transfer amount of the pickup is also difficult.

However, if the pressing force of the leaf spring e is reduced, the pick-up feed screw b itself is easy to move in the start direction, and the position of the pick-up a relative to the recording surface of the disc-shaped recording medium may be greatly shifted. Could not.

The present invention has been devised in view of the above circumstances, and it is possible to prevent the movement of the pick-up feed screw in the start direction by eliminating the factors that hinder the rotational movement of the pick-up feed screw, and to manage the feed amount of the pick-up with high precision. An object of the present invention is to provide a pick-up feed screw installation mechanism for a disc-type recording medium reproducing apparatus.

One end of the pick-up feed screw is received with a rigid stopper, the other end of the pick-up feed screw is brought into contact with a contact piece, and a leaf spring is disposed on the outer side of the contact piece, and the plate spring is installed with a mounting screw on the substrate. A mounting screw was used to adjust the root between the leaf spring and the contact piece.

By adjusting the mounting force of the mounting screw to adjust the clearance between the plate ring and the contact piece to be "0" at the target, the rotational load of the pick-up feed screw decreases and the pick-up feed screw moves in the start direction. Shall not move on.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 3.

1 is a perspective view of a portion of a disk-type recording medium reproducing apparatus to which the present invention is applied; FIG. 2 is a bottom view of the pickup transport screw mounting mechanism of the present invention; FIG. 3 is a sectional view taken along line III-III of FIG. Is a disc-shaped recording medium reproducing apparatus, and a reproducing section 2 is installed at the center thereof.

This regeneration unit 2 is provided with a turntable 4, a cranker 5, and a pickup 6 which rotate-drive the motor 3 in the same manner as in the prior art.

The motor 3 is fixed to the lower surface of the board | substrate 7 with a pair of mounting screws 8.

The rotating shaft 9 of this motor 3 protrudes on the upper surface side of the board | substrate 7, and the turntable 4 is being fixed to this rotating shaft 9.

The cranker 5 is supported above the substrate 7 via a holder 11 made of a leaf spring on a support plate 10 which is positioned above the substrate 7 so as to be movable in the axial direction of the rotary shaft 9. It is facing.

As shown in FIG. 2, a pair of pick-up supports 12a and 12b of a synthetic resin material are screwed to the bottom surface of the substrate 7, and a pair of guide bars 13a and 12b are formed between both supports 12a and 12b. 13b) are installed in parallel with each other.

And the lower end part of the pick-up 6 is attached in parallel with the lower surface of the board | substrate 7 between these pair of guide parts 13a and 13b.

A screw hole 14 is drilled at one side of the lower end of the pickup 6.

The pick-up feed screw 15 parallel to the guide rods 12 and 13 is supported between the pair of pick-up supports 12a and 12b, and the screw hole 14 of the pick-up 6 is a transfer screw. Listed in (15).

The upper end of the pickup 6 is directed to the upper surface side of the substrate 7 through the opening 7a provided in the substrate 7 to be movable.

The pickup 6 moves in the directions of arrows A and B of FIGS. 2 and 3 by the screw feed action caused by the forward and backward rotation of the pickup feed screw 15.

The pick-up feed screw 15 is rotatably supported by the bearings 16 and 17 formed at both ends thereof integrally with the pick-up support 12a and 12b.

One end of the pick-up feed screw 15 (the right end in the third middle) is axially stopped by the rigid stopper 18 formed integrally with the bearing 16 on one end.

At the other end of the pick-up feed screw 15, a contact piece 19 provided integrally with the bearing 17 of the other end shaft abuts.

The contact piece 19 is connected to the pickup and the support 12b via the main body portion and the thin portion 19a, and swings around the thin portion 19a so as to be free to the other end of the feed screw 15. It can be reached.

Moreover, the tip of the stopper piece 19b is brought closer to the outer surface of the contact piece 19 in the pickup support 12b to limit the amount of waves of the contact piece 19.

The leaf spring 20 is arrange | positioned between the contact piece 19 and the stopper piece 19b.

The leaf spring 20 has a bent portion 21 bent in a U shape and an extension portion 22 extending from one piece 21a of the bent portion 21.

Then, the other piece 21b of the bent portion 21 is brought into contact with the lower surface of the substrate 7, and the tip of the extension part 22 is projected outward from the gap between the contact piece 19 and the stopper piece 19b. In the state, it is attached to the lower surface of the board | substrate 7 by the mounting screw 23 which penetrated the both sides 21a and 21b of the bending part 21. As shown in FIG.

Therefore, the gap between the extension part 22 of the leaf spring 20 and the contact piece 19 can be adjusted by adding or subtracting the holding force of the mounting screw 23, but the stopper piece ( A tool insertion hole 19c is opened in 19b).

Moreover, 24 in FIG. 2 and FIG. 3 are pliers fixed to the other end side of the pick-up feed screw 15, and this pulley 24 and the motor pulley fixed to the rotating shaft 25a of the feed motor 25 ( An endless belt 27 is placed between 26 and 26.

Then, the pick-up feed screw 15 is driven by a certain amount of rotation by the feed motor 25 to feed the pitch of the pick-up 6.

28 shows an accommodating part for accommodating a plurality of disc-shaped recording mediums (not shown), and an acquiring mechanism for acquiring a small amount of disc-shaped recording medium from the accommodating part 28 and transferring it onto the turntable 4. to be.

Thus, the operation of the disc-shaped recording medium reproducing apparatus 1 is the same as the conventional one. When the disc-shaped recording medium drawn out by the take-out mechanism 29 in the accommodating portion 28 is placed on the turntable 4 and set, The cranker 5 is lowered and driven by the motor 3 in a state where the disc-shaped recording medium is sandwiched between the cranper 5 and the turntable 4.

At the same time, the pick-up feed screw 15 is rotationally driven by the feed motor 25 so that the pick-up 6 is pitch-feeded by a fixed amount in association with the axis of the guides 12 and 13.

In the above-described configuration, the gap between the leaf spring 20 and the contact piece 19 can be changed while the mounting force of the mounting screw 8 is changed, and the contact piece 19 of the leaf spring 20 can be changed. Since the compressive force for) may be added or subtracted, it is possible to adjust the compressive force so that the gap between the leaf spring 20 and the contact piece 19 is approximately " 0 " .

Therefore, if such adjustment is made in advance, the rotational load of the pick-up feed screw 15 is reduced and the pick-up feed screw 15 does not move in the thrust direction.

4 is a cross-sectional view of the pick-up feed screw installation mechanism showing another embodiment of the present invention.

In addition, in the Example of FIG. 4, the same code | symbol is attached | subjected to the drawing about the same part as the Example of FIG. 1 thru | or FIG. 3 mentioned above.

This embodiment of FIG. 4 is formed by cutting up and down the installation piece 7a at right angles and downwards to the board | substrate 7, and the other side of the bending part 21 of the leaf spring 20 on the outer surface of this installation piece 7a. The leaf spring 20 is attached to the outer surface of the mounting piece 7a of the board | substrate 7 by the mounting screw 23 which contacted (21b) and penetrated the both sides 21a and 21b.

And the extension part 22 of the one piece 21a of the bending part 21 of the leaf spring 20 is the upper surface side through the opening 7b formed in the board | substrate 7 in connection with the cut-up formation of the mounting piece 7a. Is made to protrude outward through the gap between the contact piece 19 and the stopper piece 19b.

Moreover, the configuration and operation of the other in this embodiment of FIG. 4 are the same as those of the first to third embodiments.

As described above, one end of the pick-up feed screw of the disc-type recording medium reproducing apparatus of the present invention is received with a rigid stopper, and a contact piece is abutted at the other end of the pick-up feed screw, and the leaf spring is disposed opposite to the contact piece. The leaf spring is installed with the mounting screw on the substrate, and the mounting screw is used to adjust the gap between the leaf spring and the contact piece.

Therefore, by adjusting the mounting force of the mounting screw, the gap between the leaf spring and the contact piece is adjusted to a target value of "0", thereby reliably preventing the movement in the thrust direction of the pick-up feed screw to improve the pitch feed accuracy of the pick-up. It can raise the effect.

Claims (2)

Receiving one end of the pick-up feed screw rotated by the motor to transfer the pick-up operation in the width direction by a rigid stopper, the contact piece is brought into contact with the other end of the pick-up feed screw, and the pick-up feed screw is interposed therebetween. A pick-up screw mounting mechanism for a disc-shaped recording medium reproducing apparatus in which a leaf spring is disposed opposite to another end of the disc spring, and the plate spring restricts movement of the abutment feed screw in the axial direction. A pick-up screw mounting mechanism for a disc-shaped recording medium reproducing apparatus, wherein the mounting spring is adjustable with respect to the contact piece, and the leaf spring is mounted on a substrate. 2. The leaf spring according to claim 1, wherein the leaf spring has a bent portion curved in a U shape, and the mounting screw is passed through both sides of the bent portion, so that an extension portion of one side of the bent portion is opposed to the contact piece. Pick-up feed screw installation mechanism of disc type record carrier playback device.