JPS6070561A - Driving means of pickup - Google Patents

Abstract

PURPOSE:To find easily out the accuracy of dimension by performing the working of a frame having a motor fitting part, the working of a pickup holder and the fitting of shafts and a bush, from the same direction. CONSTITUTION:The frame 10 is molded by a metallic die cast, a motor 4 is fitted to the fitting part 10a formed on one end part and two shafts 6 are set up on a step part 10b formed the other end. The pickup holder 11 is supported by the shafts 6 through the bush 8 so as to be freely slided and a pickup 9 is charged to the pickup holder 11. At the working of said pickup holder 11, a base board 14 is used as a reference plane and grooves 11a, 11b and a pickup fitting part 11c are simultaneously worked from the same direction. In addition, the step part 10b for fitting the shafts 6 and the fitting part 10a of the motor 6 are simultaneously worked from the upper part of said frame 10. Therefore, the accuracy of the dimension is easily found out.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for optically reading information recorded on a disk, and particularly relates to an improvement in a pickup drive device thereof.

A conventional example of this type of device is shown in FIG. In FIG. 1, a motor 4 for rotating a disk 3 on a turntable 2 is attached to one half of the chassis 1 (11-4!). b 嬬a
nσ) Attach 1M frame 5 to the bottom surface - this frame 5
A pickup holder 7 is slidably attached to the shaft 6 via a bushing 8 fixed to the pickup holder 7, and the upper vc hs disk 3 of the pickup holder 7 is connected to the upper part of the pickup holder 7. Pinkup 9, which irradiates the beam, is fixed. Then, by driving the big anoghodder 7 in the radial direction of the disk 30 by a motor (not shown), the recorded information on the disk 3 is
It is for optically viewing information.

However, in the above-mentioned conventional device, the motor 4 and the frame 5 are connected by a single board chassis 1 made by metal working, and the flatness of the sheet metal proboscis is not sufficient.
The parallelism between the optical axis 9a of the pickup 9 and the optical axis 9a of the pickup 9 is particularly important for example, in the case of a small acoustic disc playback device ff1K called a so-called compact disc. Since extremely high precision is required, the cost of parts such as the chassis 1, motor 4, pickup holder 7, etc. must also be high.

Therefore, as a method that does not require the precision of each part to be so high, it may be possible to install an angle adjustment device in the pickup mounting part, but this would result in increased costs due to the increase in the number of parts and the complexity of adjustment work in the manufacturing process. This causes an increase in

81S2 Figures (a) and (b) are a schematic diagram and a front view of the pickup holder portion of the above-mentioned conventional example, and as is clear from the drawings, the bushing 8 is inserted into the hole drilled in the pickup holder 7 by press fitting. In addition, a total of four holes are provided in the pick-up holder 70 ll11+ portion, and a pick-up mounting portion 7a is formed on the top surface.

Therefore, it is difficult to process the holes of both measuring parts and the pickup mounting part 7a at the same time with the same processing machine, and it is difficult to achieve parallelism between the holes and between the holes and the pickup mounting part 7a. . Furthermore, if the distance between the two shafts 6 and the distance between the bushings 8 are different, assembly may not be possible, or even if assembled, a large driving force will be required to operate the pickup holder 7, resulting in light beam distortion. Apart from the optical axis problem, this also affects the stability of the servo during tracking.

The present invention has been developed in view of the above-mentioned drawbacks, and allows processing of the frame and pickup holder, as well as removal of the l11111 bushing, from the same direction, thereby improving component accuracy, reducing costs, and reducing the number of processing steps. This is the purpose.

An embodiment of the present invention will be described below based on the drawings.

3 and 4 are diagrams showing the overall structure of this embodiment.
The figure is a front partial sectional view, and FIG. 4 is a perspective view.

The frame IO is molded from aluminum or other metal die-casting, and a mounting portion 10 is formed at one end.
A motor 4 is attached to the motor 4, and two 111116 are installed on the stepped portion 10b formed downward at the other end.

A pink up holder 1 is connected to this shaft 6 via a bush 8.
1 is slidably supported, and a pickup 9 is attached to the pickup holder IIK.

FIG. 5 is a cross-sectional view showing the relationship between the pickup holder 11 and the bushings 8 and 9. The detailed structure will be explained based on FIG. 5 and FIG. 4. The pickup holder 11 has an open surface at the top. Parallel Tl of two Oka
ff portions 11 a and 11 b, one groove portion 11
1) The i11 part of a is provided with a pickup mounting part 11c. ＠Pushies 8 are housed in both ends of one groove 11a, and 1 is housed in the other groove 11'b.
These bushings 8 are arranged in grooves 11as 11 by regulating members 12 and 13 such as plates and screws provided on the top surface of the pickup holder 11.
The position is set to 1 within b. As is clear from FIG. 5, a slight clearance t is formed between the trailing surface of the bush 80 in the groove 11b and the lower surface of the regulating member 13. However, Pink Up Holder II
The moment relative to K is 0 for one shaft 6 and bush 8.
4 part 11a, it is held by the regulating member 12ic, and a pickup 9 with a monthly amount is attached to this shaft 6 opposite to the other shaft 6. As a result, the groove 11 b acts in the direction of the arrow in FIG.
The lower surface of the inner bush 8 is always +A7 f5B 11
b, and engages with the pickup holder 11 and bushing 8 without injury, and does not affect the parallelism of the pickup mounting 1yls11c with respect to the frame 10. Moreover, because of this clearance t, only the moment acts on the pickup holder and the pusher 8 in one of the grooves 11a, so that one number is sufficient.

Figure 6 shows the machining of the upper i pickup holder 11.
1, the pick-up boulder 11 is placed against the base 14.
11a with the base 14 as the reference surface.
, Ilb and the pickup mounting portion 11c are processed simultaneously in the same direction. Therefore, commercial capital 11a
, 11b O>Bottom, 11411 The dimensions of the wall and the pickup mounting Mlillc can be sufficiently obtained.

FIG. 7 explains the processing of the frame 10, in which the frame 10 is fixed on the base 5, and the stepped portion 10b for mounting the 44116 and the mounting ftu 10a for the motor 4 are shown.
are processed simultaneously from above. Therefore, the step portion 1
The dimensional accuracy between the mounting portion tOa and the mounting portion tOa can be improved.

The present invention has been described in detail in the embodiments above, and in particular includes a frame having a motor mounting portion to which a motor for rotating a disk is mounted, a shaft mounted on the frame, and a sliding mechanism attached to the shaft. A pickup holder that includes a bushing to be inserted, a groove in which the bushing is accommodated and has an open surface, and a pickup mounting portion to which a pickup is attached, and a bushing accommodated in the groove of the pickup holder that is prevented from coming off from the groove. The structure is equipped with a regulating part blade.

Therefore, since the machining direction of the component mounting portion related to the tooth angle of the pickup can be performed from the same direction, dimensional accuracy can be easily achieved without using a high-precision processing machine.

Furthermore, since the mounting reference position of the mounting parts is based on the machined surface, assembly can be easily performed with the required accuracy without having to use methods such as jig adjustment during mounting.

Therefore, the number of parts and the number of man-hours during parts processing and assembly can be reduced, which has a great effect on cost reduction.

[Brief explanation of drawings]

Anchor Figure 1 is a partial front view of a conventional pickup drive device, and Figure 2 shows the pink-up holder of the above-mentioned conventional example.
a) is a side view, (b) is a positive view (111 section 1, Figures 3 to 7)
The figures are explanatory diagrams showing one embodiment of the present invention, Fig. 3 is a cross-sectional view showing the entire pickup drive device, Fig. 4 is a perspective view of the pick-up device, and Fig. 5 is a pickup holder and bushing. FIG. 6 is a sectional view illustrating the processing of the pickup holder, and FIG. 7 is a sectional view illustrating the processing of the frame. 3...disk, 4...motor, 6...
... Axis, 8... Bush, 9...
・Pickup, ■0...Frame, 11...
...Pickup holder, 11a, Jlb.
...Groove portion, 11c...Pickup receiving portion, 12, I3...Regulation member.

Claims (1)

[Claims] A frame having a motor receiving part to which a motor for rotating a disk is attached, a shaft attached to the frame, a bushing slidably inserted into the shaft, and a groove in which the bushing is housed and has an open surface. A pickup drive device comprising: a pickup holder having a pickup mounting portion to which the pickup is attached; and a regulating portion side that regulates separation of a bushing housed in a groove of the pickup holder from the groove.