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Device for detecting speed of mainshaft of CD drive

An optical disc drive and detection device technology, which is applied to instruments, information recording on magnetic disks, magnetic recording, etc., can solve problems such as the control of the overall cost of the optical head evaluation instrument, the high price of the photoelectric encoder, and the improvement of the overall optical head evaluation instrument. cost, etc.

Inactive Publication Date: 2007-12-05
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV +1
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Problems solved by technology

However, the price of the photoelectric encoder is high, which increases the overall cost of the optical head evaluation instrument, which is not conducive to the control of the overall cost of the optical head evaluation instrument

Method used

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  • Device for detecting speed of mainshaft of CD drive
  • Device for detecting speed of mainshaft of CD drive
  • Device for detecting speed of mainshaft of CD drive

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Embodiment Construction

[0028] The present invention will be further described below in conjunction with the accompanying drawings and preferred embodiments.

[0029] The structure of a detection device that can be used to detect the spindle speed of an optical disc drive is shown in FIG. 1 , including: a magnetoelectric speed sensor 1 , a filter / amplification circuit 2 , and a pulse shaping circuit 3 . Taking the detection of the spindle speed of the optical head evaluation instrument as an example, the magnetoelectric speed sensor 1 is installed at the tail of the spindle motor 4 to be tested. The main shaft motor 4 of the optical head evaluation instrument under test rotates, which drives the magnetoelectric speed sensor 1 to detect the main shaft speed of the motor 4, and outputs a pulse signal similar to a sine wave. The signal passes through the filter / amplification circuit 2 and the pulse shaping circuit 3, Output standard digital pulse signal for subsequent counting and speed measuring circui...

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Abstract

The invention discloses a rotary speed detecting device of main shaft of disc drive, which comprises the following parts: detecting element to switch the rotary speed signal to electric pulse, subsequent disposing circuit to switch the electric pulse output by detecting element into rotary speed information, wherein the detecting element is magnetioelectric rotary speed sensor, which detects the rotary speed of main shaft of the disc driver and transforms the rotary speed into disposable electric signal. The invention reduces the cost of detecting device under affirming the precision, which can measure the rotary information of disc driver.

Description

technical field [0001] The invention relates to a rotation speed detection device, more specifically, to a rotation speed detection device for a main shaft of DVD and CD disc drives, especially for the detection of the main shaft speed of an optical head evaluation instrument and similar instruments. Background technique [0002] The performance of DVD and CD disc drives has a great relationship with its spindle speed, especially the optical head evaluation instrument, that is, the optical head performance parameter test and evaluation system, which is the key equipment for the research, production and inspection of DVD and CD optical heads. . Optical head evaluators and similar instruments require a stable spindle speed, so a high-precision and reliable spindle speed detection device is essential. [0003] The spindle speed detection devices of the existing optical head evaluation instruments all use photoelectric encoders as sensors. Through the photoelectric encoder con...

Claims

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Application Information

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IPC IPC(8): G11B19/28G11B19/20
Inventor 马建设王烁石王玉秀史洪伟张布卿程雪岷毛乐山齐国生潘龙法闫霜孙满龙杨明生
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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