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Disk recording/replaying unit and its pick-up initial position adjusting method

A playback device, the technology of the initial position, which is applied in the directions of recording/reproducing by optical methods, recording of information on a magnetic disk, magnetic recording, etc., can solve problems such as troubles

Inactive Publication Date: 2004-04-21
SANYO ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The detection switch (SW) is installed on the chassis (4). In the case of mass production of devices, due to the dispersion of the installation position and installation angle of the detection switch (SW), even if the detection switch (SW) is pressed, the pickup will stop. (3), sometimes the pick-up (3) cannot be accurately located in the lead-in area
In addition, the pickup (3) is driven by a motor (not shown). However, due to the dispersion of the driving force of the motor and the dispersion of the moving load of the pickup (3), even if the detection switch (SW) is installed accurately , the movement distance caused by the inertia after the detection switch (SW) is pressed until the pick-up (3) stops is different, and sometimes the pick-up (3) cannot be located in the lead-in area (A) at the beginning
In order to solve this problem, consider checking the installation position of the detection switch (SW) etc. at each mechanical platform (2), however it will be very troublesome to do so

Method used

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  • Disk recording/replaying unit and its pick-up initial position adjusting method
  • Disk recording/replaying unit and its pick-up initial position adjusting method
  • Disk recording/replaying unit and its pick-up initial position adjusting method

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment

[0053] Figure 7A , Figure 7B , Figure 8 as well as Figure 9 Shows the relationship between the detection switch (SW) and the target area. In this example, when the overrun time in the microcomputer (1) is a positive value, the pickup (3) moves toward the outer peripheral side of the disk, and when it is a negative value, it moves toward the inner peripheral side of the disk.

[0054] In addition, the adjustment of the initial position of the pick-up (3) in this example is shown in Figure 10 to Figure 12 In this initial position adjustment, position fine-tuning control is performed.

[0055] position fine-tuning control

[0056] The so-called position fine-tuning control refers to detecting ON and OFF of the detection switch (SW), so that the pick-up (3) only reciprocates with a small amount, specifically shown in Fig. 6A and Figure 13 process. Move the pickup (3) toward the outer periphery of the disk in advance. First, the ALU (10) reads the overrun time store...

no. 2 Embodiment

[0084] Figure 14A , 14B as well as Figure 15 The relationship between the detection switch (SW) and the target area in other embodiments is shown.

[0085] In this embodiment, contrary to the first embodiment, the pickup (3) moves toward the inner periphery of the disk when the overrun time is positive, and moves toward the outer periphery of the disk when it is negative. Additionally, position trimmer controls such as Figure 16 , Figure 17 The flow shown in FIG. 6B is different from that of the first embodiment, and the sequence of position fine adjustment control will be described below.

[0086] position fine-tuning control

[0087] In FIG. 6B, the pickup (3) is moved to the outer periphery of the disk in advance. Firstly, the pickup (3) is moved inward (S40), and the detection switch (SW) is set to ON (S41, point AA). Reverses the direction of rotation of the motor driving the pickup (3). After the pick-up (3) exceeds the detection switch (SW) B1 due to inert...

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PUM

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Abstract

In a disk recording or the reproducing device, a target region is first set, a pickup is moved toward the inner periphery of a disk and a detection switch SW is turned ON. Then, the pickup 3 is reversely moved and is overrun for a certain time from the position where the switch SW is turned OFF. Then, the address after the overrun is accomplished is read, the pickup is returned and the overrun time is reduced if the address is at the outer peripheral side of the disk than the target region. Then, the moving operation of the pickup toward a lead in area is repeated and the overrun is reversed toward the inner peripheral side of the disk if the address is in the disk outer peripheral side than the target region when the overrun time reaches less than a prescribed amount. Then, the overrun time is stored if the target region is accurately reached.

Description

technical field [0001] The present invention relates to a device for recording or reproducing information on a disc and a method for adjusting the initial position of a pickup thereof. Background technique [0002] As a mechanical platform (2) of such a disc recording / reproducing apparatus, a structure shown in FIG. 2 is known. Two guide shafts (41) (41) are erected in the opening (40) provided on the chassis (4) by the mechanical platform, and a turntable (31) for rotating the disk is set at the end of the opening (40). A pickup (3) with an objective lens (30) is inlaid in a freely movable manner on the two guide shafts (41) (41). The pickup (3) is driven by a motor (not shown) on the chassis (4). In the opening (40), near the turntable (31), a detection switch (SW) for detecting that the pickup (3) has reached the innermost peripheral side of the disk is provided. [0003] The disk (6) is accommodated in a case (60) on which a shutter (61) is provided. In the state whe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B7/085G11B19/14G11B21/12
CPCG11B19/14G11B21/12G11B7/08505
Inventor 尾方仁士
Owner SANYO ELECTRIC CO LTD