JPS58177575A - Lead-in adjusting mechanism of video disk player - Google Patents

Abstract

PURPOSE:To make an adjustment of lead-in operation precisely in a short time, by setting a photocoupler supporting body where light emitted through a reflecting plate is almost photodetected when a stylus cartridge is at a lead-in position. CONSTITUTION:The photocoupler supporting body 7 has its movable part (supporting-body movable part) 7a adjusted nearly in the moving direction of a pickup arm 1 according to the rotation of an adjusting screw 6 provided to its fixed part (supporting-body fixed part) 7b. Firstly, a pickup arm 1 is set at a specific position, i.e. where the stylus cartridge 2 is led in. Then, the adjusting screw 6 is turned to adjust the position of the movable part 7a so that the light emitted from the light emission part 5a of a photocoupler 5 is reflected by the reflecting plate 4 and then photodetected by the photodetection part 5b of the photocoupler 5. After this position adjustment, said screw 6 is fixed in a freely rotatable state.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a readable device for a video disc player: ygM.
Regarding the adjustment mechanism.

A conventional video disc player glue-in adjustment mechanism will be described below.

As is well known, the conventional lead-in adjustment mechanism consists of the following two structures.

(1) A metal fitting that is installed near the rearmost end of the pickup arm at a predetermined location on the video disc player body, whose position can be adjusted using screws and springs, and which has a light emitting and light receiving portion.

(2) provided at the rear end of the pickup arm;
and a shutter with a small diameter hole.

As is well known, the conventional lead-in is performed when the hole in the shutter attached to the pickup arm passes through the light emitting and light receiving portion of the metal fitting.

Therefore, in the conventional lead-in adjustment, when the pick-up needle attached to the tip of the pickup arm is at the desired position, that is, the lead-in position, the shutter hole attached to the pickup arm is inserted into the light-emitting and light-receiving part of the metal fitting. It was supposed to pass through.

However, as is clear from the above, if the position of the lead-in adjustment mechanism is quite far from the pickup needle, that is, the signal detection part of the pickup arm, for example, the arm may be deformed. for,
These had to be considered as adjustment factors.

That is, the conventional lead-in adjustment mechanism has a disadvantage in that since the adjustment mechanism and the location to be adjusted are separated, there are many adjustment factors that must be taken into consideration, and therefore, accurate adjustment is difficult. Furthermore, there was also the drawback that adjustment took time.

The object of the present invention is to overcome the drawbacks of the prior art described above.

To provide a lead-in adjustment machine for a video disc player that can remove the lead-in and adjust the lead-in with high accuracy and in a shorter time than the conventional one.

In order to achieve the above object, the present invention includes a shutter that is attached to a pickup arm near the stylus cartridge and has a reflector fixed at a predetermined position, and a support fixing part and support that are fixed to the video disc player main body. A photocoupler support body consisting of a body movable part, and a light emitting part and a light receiving part fixed to a predetermined location of the support movable part and arranged so that the emitted light can be received again through the reflection plate. a photocoupler having a photocoupler, and an ar provided on the support fixing part and for slightly moving the support movable part in the rotational direction of the pickup arm.
We decided to provide m screws.

Furthermore, in the present invention, in order to achieve the above object, the photocoupler support is capable of receiving the emitted light through the reflector when the m generation stylus cartridge is in the lead-in position. It was decided to install it at the location.

Hereinafter, the present invention will be explained using the drawings.

FIG. 1 is a perspective view for explaining one embodiment of the lead-in adjustment mechanism for a video disc player of the present invention, and FIG. 2 is a rounded view for explaining one embodiment of the lead-in adjustment mechanism of the present invention. 2 is a partially sectional side view taken along line 1-1 in FIG. 1. FIG.

In these figures, 1 is a pickup arm, 2 is a stylus cartridge set near the tip of the pickup arm 1, 5 is a shutter, and 4 is a reflection plate fixed to the shutter 3.

Further, in these figures, 5 is a photocube 2.5a is a light emitting part of the photocoupler 50, 5b is a light receiving part of the photocoupler 5, 6 is an adjustment screw 7 is a 7-power plastic support, and 7a is a 7-power plastic support. The movable part of the force gravity support 7 (hereinafter referred to as
7b is a fixed portion of the photocoupler support 7 (hereinafter referred to as a support fixed portion); 8 is a stay 2 screener; 10! , 10b is attached with screws.

Note that 3 to 7b constitute the lead-in adjustment mechanism of this embodiment.

In the lead-in adjustment mechanism of this embodiment, FIGS.
As is clear from the figure, a shutter 5 to which a reflection plate 4 is fixed is attached to the pickup arm 1 near the stylus cartridge 2.

On the other hand, in the lead-in adjustment mechanism of this embodiment, the stylus cartridge 2, especially the stylus,
When lead-in to a predetermined position, the photocoupler 5 is positioned so that the approximately central portion thereof is located at a location opposing the reflection plate 4 of the shutter 3 fixed to the pickup arm 1, that is, the light from the light emitting portion 5a is directed. Reflected by the reflector 4,
The photocoupler support 7 is attached to the main body of the video disc player so that the light is incident on the receiving light s5b. In addition, for this installation, use screws 10a and 10b.
It is carried out by

Furthermore, the 7-force bra support 7 of this embodiment is particularly i@2
As is clear from the figure, its fixing part (support fixing part)
According to the adjustment screw 60 rotations provided in the adjustment screw 7b, that is, according to the degree of protrusion of the tip of the screw 6, the movable portion (support movable portion) 7m is adjusted in the movable direction of the pickup arm 1. He is now able to move slightly. That is, in the lead-in adjustment mechanism of this embodiment, the position of the 7-point hook 25 can be adjusted using the adjustment screw 6.

Next, how the lead-in adjustment is performed by the lead-in adjustment machine of this embodiment will be specifically explained.

First, the pickup arm 1 is placed at a predetermined position, that is, the position where the stylus cartridge 2 is to be lead-in. Next, by rotating the adjustment screw 6, the light emitted from the light emitting part 5m of the photocoupler 5 is reflected by the reflection plate 4 and detected again by the light receiving part 5b of the photocoupler 5, as shown in FIG. Adjust the position of the support movable part 7M so that it can be moved. After completing this adjustment, tighten the screw 6 so that it cannot rotate freely.

In this embodiment, the adjustment screw 6 is mounted so as to press the support movable portion 7a obliquely from above. However, the screw 6 may be installed so as to press the support movable portion 7a directly from the side or from diagonally below. However, if it is attached so as to be pressed diagonally from below, it is necessary to provide a stopper or the like to prevent the support movable part 71 from lifting up.

As is clear from the above description, in the lead-in adjustment mechanism of the video disc player of the present invention, unlike the conventional one, the adjustment mechanism is located near the stylus cartridge, so that adjustment factors can be reduced. As a result, the lead-in adjustment mechanism for a video disc player of the present invention allows for faster and more accurate adjustment than conventional adjustment mechanisms, even when the pickup arm is deformed, for example, as described above. There is an effect that can be done.

[Brief explanation of the drawing]

FIG. 1 is a perspective view for explaining one embodiment of a lead-in adjustment mechanism for a video disc player according to the present invention, and FIG. 2 is a lead-in adjustment machine 1 for a video disc player according to the present invention.
1110- It is a diagram for explaining the embodiment, and is a partial cross-sectional helmet view taken along the shoulder line of FIG. 1. 5...Shutter 4...Reflection IE5...
-7 Oto coupler 51...Light emitting part 5b...Light receiving s6...Adjustment screw 7...7 Oto force plastic support 71...Support movable part 7b...Support fixing part Fig. 1 Figure 2

Claims (1)

[Claims] (1) A photocoupler support consisting of a shutter that is attached to the pickup arm near the stylus cartridge and has a reflector fixed at a predetermined location, and a support fixed part and a support movable part fixed to the video disc player body. a photocoupler fixed to a predetermined location of the support movable part and arranged so that the emitted light can be received again through the reflection plate, and having a light emitting part and a light receiving part; and the support fixing part. and an adjustment screw for slightly moving the support movable part in the movable direction of the pickup arm, and when the stylus cartridge is in the lead-in position, the support movable part is provided with an adjustment screw through the reflection plate. . A lead-in adjustment mechanism for a video disc player, characterized in that the 7-hole plastic support is installed at a position where it can substantially receive the emitted light.