JPS63108573A - Pickup driving device - Google Patents

Abstract

PURPOSE:To shorten the length of a screw rod and to reduce the size of a device by slidably supporting a drive section in the guide groove of a mechanical chassis at a position where the distance from a nut of the drive section is longer than that upto the conjunction point of the drive section and a pickup. CONSTITUTION:A pin 7 is provided in such a position as farther from the nut section 8 in the direction of the screw rod 9 than the distance from the nut section 8 of a transmitting member 5 to a pin 6, whereby the pin 7 is inserted slidably into the guide groove 10 of the mechanical chassis 17. The drive section is thus prevented from inclining due to a resistance of the pickup 1 sliding on a guide bar 2. Consequently, the nut section 8 and the screw rod 9 can be shorten in length and the device is therefore reduced in size.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides a pick amplifier for recording or reproducing signals on a disc such as a video disc or a compact disc player, which is installed parallel to the center line of the disc. The present invention relates to a pickup driving device for moving the pickup.

[Conventional technology]

A conventional pickup drive device of this type is shown in Fig. 4.
There is one shown in FIG. 5, which will be explained below.

(2) is a pickup, the guide bar holding portion 3 of which is slidably fitted to the guide bar 2;

Reference numeral 21 denotes a transmission arm, the nut part 8 of which is screwed into a screw rod 9, and the rotation of the screw rod 9 causes the transmission arm 21 to move as follows.
It moves in the axial direction of the screw rod 9.

The transmission arm 21 and the pickup 1 are attached to each other by a screw 22 so that the transmission arm 21 can rotate around the screw 22.
The pickup 1 is interlocked with the movement in the axial direction.

A spring 20 is wound around the screw 22, and both ends of the spring 20 are attached to the pickup 1 and the transmission arm 21, and the pickup 1 is biased in the direction of rotation about the screw 22.

On the other hand, cam 19 is attached to Pink Asop 1,
The cam 19 is pressed against the plate 16 by the bias of the spring 20.

Therefore, when the cam 19 is rotated, the pickup 1 is rotated about the guide bar 2 against or by the bias of the spring 20, and the inclination of the pickup 1 with respect to the disk, that is, the tangential, is adjusted. Can be done.

This pink amplifier drive mechanism, when the screw rod 9 rotates,
The transmission arm 21 is sent in the axial direction of the threaded rod 9 by the threaded engagement between the nut portion 8 and the threaded rod 9, and its movement is transmitted to the pickup 1 by the screw 22.
The guide bar holding portion 3 slides on the guide bar 2.

In this manner, the pickup 1 reproduces or records signals on the disk 1 by sliding the pickup 1.

[Problems to be Solved by the Invention] In the conventional pickup drive device, there is a certain distance between the guide bar holding portion 3 of the pick-up 1 and the NAND portion 8 of the transmission arm 21.

When the guide bar holder 3 slides on the guide bar 2, there is frictional resistance, and this frictional resistance tends to tilt the transmission arm 21 with respect to the threaded rod 9.

Therefore, unless the nut portion 8 has a considerable length, it will not be able to overcome the above-mentioned tilting force and move smoothly on the threaded rod 9 in its axial direction.

Therefore, the length of the threaded rod 9 is increased by the length of the nut portion 8.
The length must be increased, which requires more space.

At the same time, the pitch between the nut part 8 and the threaded rod 9 must be the same throughout the entire length, and if there is a deviation in one part, there is a risk that the damage will increase in that part.

Therefore, high precision is required for smooth operation, and there are drawbacks such as high parts processing costs.

[Purpose of the invention]

The present invention solves the above-mentioned drawbacks of the conventional pickup drive device, and allows smooth movement even if the length of the nut that fits into the threaded rod is shortened, thereby making it possible to shorten the length of the threaded rod. At the same time, parts accuracy is not required as much,
The object of the present invention is to provide a pick-up drive device that can reduce parts processing costs.

[Summary of the invention]

In order to achieve the above-mentioned object, the present invention installs a sliding piece of the drive unit at a position longer from the nut of the drive unit that is screwed into the threaded rod than the distance from the nut to the connection point between the drive unit and the pickup. , the pickup is slidably held by a guide of a fixed plate formed in the sliding direction of the pickup.

[Embodiments of the invention]

An example of the implementation of the present invention will be described below with reference to FIGS. 1 and 2.

Reference numeral 1 denotes a pickup for reproducing or recording signals on a disk, and its guide bar holding portion 3 is slidably fitted to the guide bar 2.

Reference numeral 5 designates a transmission member, the NAND portion 8 of which is screwed into a screw rod 9, and the rotation of the screw rod 9 causes the transmission member 5 to move in the axial direction of the screw rod 9.

The pickup 1 and the transmission member 5 are
By inserting the pin 6 of the transmission member 5 into the elongated hole 4 of the pickup 1, they are connected with just enough play in the sliding direction of the pickup 1.

Further, a pin 7 is provided on the transmission member 5 at a position extending from the NAND portion 8 in the axial direction of the threaded rod 9 than the distance from the nut portion 8 to the pin 6. It is slidably inserted into the guide groove 10 of the mechanical chassis 17.

A spring holding pin 11 is erected on the transmission member 5, and both ends of a spring 18 wound on the spring holding pin 11 with a gap between the windings are connected to the pin 12 of the pickup 1 and the pin 13 of the transmission member 5. The pins 12 and 13 are biased in the direction of the arrow in FIG.

At the same time, the spring 18 biases the pickup upwardly against the transmission member 5 due to the spacing between its windings.

Furthermore, a recess 23 is formed on the top surface of the pickup 1, and the tip of an adjustment screw 15 screwed into one side of the recess 23 is brought into contact with the steel ball 14 housed in the recess 23.

For this purpose, when the adjustment screw 15 is tightened to push up the steel ball 14, the recessed portion 23 side of the pickup 1 is pushed down against the bias of the spring 18, and on the other hand, by loosening it, the steel ball 14 can be lowered. Then, the recessed portion 23 side of the pickup 1 is lowered by the bias of the spring 18.

In this manner, by rotating the pickup 1 with respect to the guide bar 2, the inclination of the pickup 1 with respect to the disk can be adjusted, that is, the tangential can be adjusted.

Due to the pressing force of the spring 18 against the pins 12, 13 in the direction of the arrow, the elongated hole 4 of the pickup 1 comes into contact with the pin 6 on the right side as shown in FIG.

Therefore, the transmission member 5 receives a force that rotates the pin 7 upward around the contact point between the elongated hole 4 and the pin 6 due to the biasing force of the spring 18.
It is subjected to a force such that it comes into contact with the upper side of O in Figure 1.

At the same time, the rotational moment due to the spring 18 is applied to the NAND portion 8
Since the nut part 8 is pressed against the upper side of the threaded rod 9 in FIG. Just screw them together.

Therefore, when the screw rod 9 is rotated, the transmission member 5 is moved in the axial direction of the screw rod 9 by the NAND portion 8 screwed thereon.

When the pin 6 of the transmission member 5 pushes the contact point of the elongated hole 4, the pickup 1 is moved to the right in FIG.

At this time, the frictional resistance between the guide bar holding part 3 of the pickup 1 and the guide bar 2 acts as a resistance on the transmission member 5, and the transmission member 5 tries to tilt with respect to the screw rod 9, but the transmission member 5
The pin 7 contacts the upper side of the guide groove 10 of the mechanical chassis 17 to prevent the transmission member 5 from tilting.

Furthermore, since the dimension from the nut portion 8 to the pin 7 is longer than the dimension from the nut portion 8 to the pin 6, the above-mentioned tilting can be effectively prevented and the movement of the transmission member 5 by the threaded rod 9 can be performed smoothly.

Since the pin 6 is pressed against the right side of the elongated hole 4, that is, in the feeding direction of the pickup 1, by the biasing force of the spring 18, the connection between the transmission member 5 and the pickup 1 is made with respect to the feeding direction of the pickup 1. There is no backlash and backlash can be reduced.

Therefore, the pickup 1 is driven to TITf.

It is possible to actually and accurately reproduce or record signals on a disc.

Although a torsion compression spring is used as the spring 18 in the above embodiment, a torsion spring 24 shown in FIG.
It is also possible to use separate springs for horizontal and vertical biasing.

〔Effect of the invention〕

The present invention provides a sliding piece in which, like a ridge, a driving part having a nand that is screwed onto a screw rod and moved by the rotation of the rod is slidably held on a guide of a fixed plate outside the nut. It was also guided by

And since the distance from the nut to the sliding piece was made larger than the distance from the nut to the connection point with the pickup,
Due to the resistance of the pickup sliding on the guide bar,
This can effectively prevent the drive unit from tilting.

Therefore, even if the length of the Nando is shortened, the moving part of the drive unit can be moved smoothly, and the length of the screw thread can be shortened by the shortened length of the Nando, which reduces the space required. becomes possible.

Moreover, shortening the length of the threaded connection between the threaded rod and the NAND not only prevents the inability to thread the thread due to pitch misalignment, uneven feeding, and increased local hacklash, but also requires high component precision. This reduces part processing costs.

[Brief explanation of the drawing]

FIGS. 1 and 2 are basic plan views of an embodiment of the present invention,
and a front view, FIG. 3 is a plan view showing another embodiment of the spring in the above embodiment, and FIGS. 4 and 5 are a plan view and a side view of a conventional pickup driving device. 1...Pickup, 2...Guide bar, 3...
Guide bar holding part, 4... Long hole, 5... Drive member,
6, 7... Pin, 8... Nand portion, 9... Screw rod, 10... Guide groove, 17... Mechanical chassis. Fig. 1 Fig. 20 Fig. 3 22 40 Insect 2: Fig. 5 [-819, formula

Claims (1)

[Claims] A pickup that is slidably attached to the guide bar, a drive unit that moves by the rotation of a threaded rod to which a nut is fitted and is connected to the pickup, and a drive unit that slides in the sliding direction of the pickup. A fixed plate in which a guide is formed, and a fixed plate that is located at a position longer than the distance from the connecting point of the pickup and the drive unit to the threaded rod than the fitting position of the nut and the threaded rod and slides into the guide groove of the fixed plate. 1. A pickup drive device comprising: a sliding piece provided on a drive portion so as to be freely held;