Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Device for detecting speed of mainshaft of CD drive

A technology of optical disc drive and detection device, which is applied in the direction of instruments, information recording on magnetic disks, magnetic recording, etc., can solve the unfavorable control of the overall cost of the optical head evaluation instrument, the high price of the photoelectric encoder, and the improvement of the overall cost of the optical head evaluation instrument. Cost and other issues, to achieve the effect of compact and reasonable space layout, high detection accuracy and stable measurement

Inactive Publication Date: 2010-01-13
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV +1
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • 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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0026] The present invention will be further described below in conjunction with the accompanying drawings and preferred embodiments.

[0027] The structure of the detection device that can be used to detect the rotation speed of the optical disk drive spindle is as follows: figure 1 As shown, it includes: 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 a...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com