KR950009550Y1 - Return path lens barrel controller of m.o.o.d - Google Patents

Abstract

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Description

Barrel Adjuster Position Recognition Device for Magneto-optical Disc Drives

1 is a structural diagram of a general optical system for pickup of an optical disk drive.

2 is a diagram illustrating a diverging beam of a general laser diode.

3 is a simplified view of a conventional adjusting device.

4 is a perspective view of the present invention.

5 is an illustrative example of the present invention.

* Explanation of symbols for main parts of the drawings

7, 27: return pass lens barrel 28: groove

31: adjuster 32: body

33: guide groove 34: tension coil spring

36, 37, 38: sensor

The present invention relates to an adjusting device for controlling the focal length by adjusting the interval of the return path lens barrel of the magneto-optical disk drive (MODD), more specifically, The adjusting device is composed of the adjuster and the body part, and the operator recognizes the position of the adjuster through a sensor for identifying each position and a light emitting diode (hereinafter referred to as an LED) connected to the adjuster of the return pass lens barrel, which makes it possible to adjust it. It relates to a position recognition device.

In general, an optical disc used for high-density information recording uses a semiconductor laser. The optical system for driving pickup using the semiconductor laser in this way has a laser diode 1 that emits a beam as shown in FIG. 1, and an aiming lens that aims the beam emitted by the laser diode 1 in parallel circular beams. 2), a beam splitter 3 for dividing the circular beam aimed by the aiming lens 2, a reflector 4 for changing the path of the light beam split in the beam splitter 3, and this reflector ( 4, an adjustment lens 5 for forming a fine focus of the disk 6 by the beam whose path is changed, and a return pass lens 7 for controlling the focal length of the beam whose path is changed by the beam splitter 3; And a polarizing beam splitter 8 for transmitting and reflecting a beam whose focal length is controlled by the return pass lens 7, and light reflected and transmitted by the polarizing beam splitter 8 to detect a current signal. It consists of a photodetector (9), 10 to convert the laser As shown in FIG. 2, the emission beam of the semiconductor laser emitted from the diode 1 has a large emission angle θ, and is perpendicular to the junction surface ( Since the light emission angles in the () and horizontal (=) directions are different, the shape of the beam becomes an ellipse, and in the optical system, a circular collimated beam is obtained by using an elliptical laser beam using a cylindrical element or a fixed element such as a triangular prism. .

On the other hand, the return pass lens is composed of a plurality of lenses and the distance between the lenses to control the focal length by using the adjuster.

3 is a simplified illustration of a conventional adjusting device, which is mounted on an operating panel (not shown) that is movable in each of the X, Y, and Z axes, and returns an adjuster 31 formed integrally with the adjusting device 30. Since the operation of positioning the groove 28 of the pass lens barrel 27 is performed, the position is simply adjusted depending on the operator's senses, and thus requires a lot of repetitive work and takes the effort and time.

The present invention has been made in view of this, and in the operation of positioning the adjuster in the groove of the return pass lens barrel, the position of the return pass lens barrel adjuster for detecting and displaying the present position of the adjuster so that the operator recognizes the position of the adjuster and performs the work. It is characterized by providing a recognition device.

In other words, the adjusting device is divided into the adjuster part and the body part, and the adjuster is formed to enable vertical movement, and the body part is configured to move horizontally, so that each movement is detected by a sensor and recognized by the operator for quick and convenient work. Will be done.

Hereinafter, the present invention will be described with reference to FIGS. 4 and 5, and the same parts will be described with the same reference numerals.

Adjusting device 30 is located on a copper panel (not shown), the adjuster 31 is configured to be operated up and down along the guide groove 33 formed in the body portion 32 to be separated from the body portion 32 It is preferable to install the tension coil spring 34 connected to the body portion 32 and to form the cover 35 so that the adjuster 31 does not escape from the guide groove 33. A sensor 36 is installed at one end of the body part to detect the position of the adjuster 31, and B and C sensors to detect the left and right positions of the body part 32 of the adjusting device 30 at any position of the operation panel. Are respectively installed, and the sensors 36, 37, 38 are connected to the LEDs 1,2,3. In addition, a sensor sensing unit (not shown) is formed at a portion detected by the sensors 36, 37, and 38.

In the present invention configured as described above, the movement error of the adjusting device 30 is detected by the sensors 36, 37, 38 for detecting the position, when the adjusting device 30 is biased to the left side, the B sensor 37 ) Is detected and LED 2 is displayed, and when the adjusting device 30 is biased to the right, the sensor 3 is detected and the LED 3 is displayed, so that the position of the adjusting device 30 is moved in the opposite direction. Adjust On the other hand, the adjuster 31 is lowered and the spring 34 is near the A sensor 36 and LED 1 is displayed, and the position of the adjuster 31 is located on the outer circumferential surface of the return path lens barrel 27 rather than the groove 28. In order to adjust the position of the barrel 27, the adjuster 31 is stored in the groove 28.

On the other hand, when the adjuster 30 is moved, the adjuster 31 is pulled downward and fixed by a separate fixing device (not shown), so that the adjuster 30 is maintained so as not to protrude above the adjuster 30 ( 10 does not interfere with the movement of the barrel, and when it is located in the groove portion 28 of the barrel 27, the fixing state is released, so that it is stored in the groove portion 28 by the elasticity of the tension coil spring 34.

As described above, the present invention detects the position of the return pass lens barrel and the adjuster immediately on the sensor when the MODD is mounted, and is displayed on the LED, so that the operator can easily recognize the adjuster's current position and quickly and conveniently position the adjuster and return the pass. It is an efficient device that can perform the price adjustment of the lens barrel.

Claims (1)

In a magneto-optical disk drive (MODD) system, the return path lens adjustment device is separated into the adjuster 31 and the body portion 32, and the guide grooves allow the adjuster 31 to move up and down on the body portion 32. 33), the operator 31 is composed of a sensor 36 for detecting the up and down position, the sensor (37, 38) for detecting the left and right positions of the adjuster body and the respective LEDs corresponding to the detection result. Adjuster 31 position recognition device of the return path lens barrel 27 of the MODD characterized in that the position of the adjuster (31) can be conveniently adjusted.