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Control circuit of limit switch in optical disk drive, and control method

A limit switch, control circuit technology, used in the recording of information on magnetic disks, instruments, magnetic recording, etc.

Inactive Publication Date: 2007-05-09
SUNPLUS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] Therefore, there is still room for improvement in the prior art as to how to make the servo control unit 102 of the optical drive control chip 10 ignore the three pins and provide other functions required by the optical drive system.

Method used

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  • Control circuit of limit switch in optical disk drive, and control method
  • Control circuit of limit switch in optical disk drive, and control method
  • Control circuit of limit switch in optical disk drive, and control method

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Embodiment Construction

[0066] Please refer to FIG. 6, which shows a schematic diagram of the limit switch control circuit of the optical drive of the present invention. The optical drive limit switch control circuit can be used to detect the position of the optical drive tray and the optical drive trolley, and includes the optical drive control chip 40, the optical drive tray 42, the optical drive trolley 46, the first limit switch 44, and the second limit switch 48. Wherein, the optical drive control chip 40 further includes: a servo control unit 401, an auxiliary function control unit 402, a film advance detection pin 403, a film withdrawal detection pin 404, a carriage return detection pin 405, a first switch 415, and a first switch 415. The second switch 416, the third switch 417. In addition, the film advance detection pin 403 is connected to the voltage source Vcc via a resistor R4, and the first limit switch 44 is connected via a resistor R7; the film ejection detection pin 404 is connected to th...

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PUM

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Abstract

A control circuit of optical driver limitation switch consists of optical driver control chip including servo control unit, auxiliary function control unit, change-over switch and control pin; resistance element connected to the first voltage source and control pin; the first isolation element connected to control pin; limitation switch connected separately to the second voltage source and said isolation element; the second isolation element connected to control pin and output end connected to the second end of the second isolation element. Its controlling method is also disclosed.

Description

Technical field [0001] The present invention is an optical drive limit switch control circuit and control method, in particular to an optical drive limit switch control circuit and control method applied to pins with input and output functions. Background technique [0002] In the electronics industry, in order to make electronic products have higher portability and lower cost, the chips in electronic products are gradually moving towards a small area, so it is necessary to use smaller packaged chips. However, because smaller packaged chips often limit the number of pins, which makes the chip unable to fully meet the additional functions required by the original system. Therefore, how to use some specific pins in a smaller packaged chip to make it Having multiple functions to achieve the additional functions required by the system is the direction of continuous efforts of chip designers. [0003] In the optical drive control chip, there are two pins used to detect the position of...

Claims

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Application Information

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IPC IPC(8): G11B19/20G11B17/04
Inventor 洪瑞彬
Owner SUNPLUS TECH CO LTD