JPS6241428Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an optical information recording device that optically records information on a disk-shaped recording medium, and easily and easily corrects dynamic imbalance caused by rotation of the disk-shaped recording medium. An object of the present invention is to provide an optical information recording device equipped with effective means for quick correction.

A general outline of an optical information recording device is shown in FIG. 1. To briefly explain the outline with reference to the figure, 1 is a disc-shaped recording medium mounted on a turntable 2, and 3 is a rotating part. It is a bearing that receives Bearing 3
There is a motor (not shown) below the disc, which rotates the disc-shaped recording medium 1 via a turntable 2 .
A fixing member 4 fixes the bearing 3 and the motor, and is hereinafter referred to as a carriage. This carriage 4 is supported by a linear guide 5, and is moved linearly by a precision feed screw 6, a precision feed nut 7, and a feed motor 8. The optical signal recorded on the disc-shaped recording medium 1 is obtained by modulating a light beam emitted from a laser 9 with an optical modulator 11, and is obtained by modulating a light beam emitted by a laser 9 with a prism 10 and an objective lens 12 having a focus control function. The light is then irradiated onto the disc-shaped recording medium 1. The above-mentioned apparatus is mounted on a vibration isolating table 13, and is configured so that external vibrations are not transmitted.

Generally, in this type of recording device, a disk-shaped recording medium rotation drive unit that rotates at high speed is mounted on the carriage 4, so the carriage 4 vibrates due to the dynamic imbalance of the disk-shaped recording medium, and the disk-shaped recording medium rotates at high speed. This has an adverse effect on the pitch of tracks recorded on the shaped recording medium. Therefore, it is necessary to correct the dynamic imbalance every time a new disk-shaped recording medium is loaded.

To explain the method of correcting the dynamic imbalance using a diagram, as shown in FIG. A detector 14 is provided, and a pulse generator 15 that generates a pulse once per rotation of the turntable is attached on its extension. If there is an imbalance in the disc-shaped recording medium 1 mounted on the tower, a vibration wave 18 is emitted from the vibration detector 14 as shown in FIG.
However, a pulse 19 is obtained from the pulse generator 15. Since one period of this pulse is one revolution of the disc-shaped recording medium, if a weight corresponding to the amplitude a of the vibration wave is placed on the turntable at a phase b° from the position where the pulse is generated (the weight is A groove 16 is provided on the turntable to make it easier to place it on the turntable), and the dynamic balance is corrected. However, the vibration detector has a velocity pickup and an acceleration pickup, and there is a 90° position difference, so this must be taken into consideration in advance. Conventionally, the weight tower mounting position (b° in FIG. 3) was measured from the pulse generation position by eye or using a protractor. According to this method, the position is uncertain and it takes time and effort. Moreover, because the position was inaccurate, it was not possible to completely remove the weight by placing the weight on the tower once, and corrections had to be made many times. This means rotating and stopping the turntable repeatedly. Since the start and stop times of the turntable are quite long, it takes a lot of time to correct the dynamic balance of the disc-shaped recording medium. The present invention is an optical information recording device that eliminates the above drawbacks. DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to drawings showing essential parts.

FIGS. 4 and 5 show a plan view and a side view of the turntable rotation drive unit and carriage according to the present invention. This device is characterized by the turntable 2, which has an annular weight installed on the outer periphery, right next to the groove 16 in which the weight is placed, and the extension of the line connecting the vibration detector and the pulse generator is set at 0°. , an angle display scale 21 is provided over the entire circumference. This eliminates the conventional drawbacks, and allows the position of the weight on the turntable to be found accurately and instantaneously. Therefore, the dynamic balance correction operation can be completed with one weight tower loading.

As described above, the optical information recording device according to the present invention can extremely shorten the preparation time before starting to record optical signals on a disc-shaped recording medium, and can record many disc-shaped recording media in a day. This is effective for mass-produced recording devices that record information on the surface.

In the embodiment of the present invention, the weight tower mounting means is a groove extending all around the turntable, but the structure is such that screw holes are provided at the smallest possible pitch all around the turntable, and the weight is mounted using screws. It is also effective.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an overview of an example of an optical information recording device, Fig. 2 is a partially cutaway perspective view showing main parts of the carriage section of the optical information recording device, and Fig. 3 is a vibration detector and A diagram showing an example of an output waveform from a pulse generator, FIG. 4 is a plan view of a carriage section showing an embodiment of the present invention, and FIG. 5 is a partially cutaway side view of the same. 1...Glass disc, 2...Turntable, 3
... Bearing, 4 ... Carriage, 5 ... Linear guide, 12 ... Objective lens, 14 ... Vibration detector,
15... Pulse generator, 16... Weight tower mounting groove, 20... Turntable drive guide.

Claims (1)

[Scope of utility model registration request] a turntable on which a disk-shaped recording medium is mounted;
A rotation drive unit that rotates the turntable, a carriage unit on which the rotation drive unit and the turntable are mounted, a guide and feeding means that moves the carriage unit in a straight line, and irradiates an information optical signal onto the disk-shaped recording medium. a scale indicating the angle of the turntable on the outer periphery of the turntable; and a weight mounting means for mounting a weight for correcting the amount of dynamic unbalance of the disc-shaped recording medium. An optical information recording device characterized in that the devices are provided circumferentially and close to each other.