KR950030070A - Laser diode protection circuit of optical disc player - Google Patents
Laser diode protection circuit of optical disc player Download PDFInfo
- Publication number
- KR950030070A KR950030070A KR1019940009285A KR19940009285A KR950030070A KR 950030070 A KR950030070 A KR 950030070A KR 1019940009285 A KR1019940009285 A KR 1019940009285A KR 19940009285 A KR19940009285 A KR 19940009285A KR 950030070 A KR950030070 A KR 950030070A
- Authority
- KR
- South Korea
- Prior art keywords
- laser light
- laser diode
- laser
- light amount
- reproducing apparatus
- Prior art date
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- Optical Head (AREA)
- Semiconductor Lasers (AREA)
Abstract
본 발명은 광디스크재생장치의 레이저다이오드로부터의 레이저광을 수광하는 포토다이오드가 특성변동 또는 기능이상의 발생에 의해 수광특성이 저하됨에 따라 유발되는 과전류에 따른 레이저다이오드의 파손의 문제점을 해결하기 위해, 광디스크재생장치내의 포토다이오드의 이상발생으로 인해 레이저광을 발생하는 레이저다이오드에 과전류가 유입되는 것을 차단함으로써 레이저다이오드의 과전류 유입으로 인한 파손을 방지하도록 하는 광디스크재생장치의 레이저디스크보호회로를 제공한다.The present invention is to solve the problem of the damage of the laser diode due to the overcurrent caused by the photodiode receiving the laser light from the laser diode of the optical disk reproducing apparatus caused by a change in the light receiving characteristics due to characteristic changes or malfunctions, The present invention provides a laser disk protection circuit of an optical disk reproducing apparatus, which prevents damage caused by inflow of an overcurrent of a laser diode by preventing an overcurrent from flowing into a laser diode generating a laser light due to an abnormal occurrence of a photodiode in the reproducing apparatus.
이에 따라 본 발명은, 레이저다이오드에서 발생되는 레이저광의 광량을 검출하는 레이저광량 검출부와, 상기 레이저광량검출부의 레이저광량검출에 따라 발생되는 출력전압을 미리 설정된 기준전압에 의거하여 증폭한 결과로 레이저광량제어신호를 출력하는 레이저광량제어부 및, 상기 레이저광량제어신호에 의해 구동되어 상기레이저다이오드에 인가되는 전류량을 증감하도록 조종하기 위한 레이저광량조정부를 구비한 광디스크재생장치의 APC장치에 있어서, 상기 레이저광량조정부로부터의 전압과 미리 설정된 기준전압을 비교한 결과에 따라 상기 레이저다이오드에 인가되는 전류를 인가/차단하도록 스위칭동작하는 레이저다이오드 보호부를 더 구비하는 것을 특징으로 한다.Accordingly, the present invention, the laser light amount detection unit for detecting the light amount of the laser light generated by the laser diode, and the laser light amount as a result of amplifying the output voltage generated in accordance with the laser light amount detection of the laser light amount detection unit based on a predetermined reference voltage An APC apparatus of an optical disc reproducing apparatus, comprising: a laser light amount control unit for outputting a control signal; and a laser light amount adjusting unit for controlling to increase or decrease the amount of current applied to the laser diode driven by the laser light amount control signal. The laser diode protection unit may further include a switching operation to apply / block current applied to the laser diode according to a result of comparing the voltage from the adjustment unit with a preset reference voltage.
Description
본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.
제1도는 본 발명에 따른 광디스크 재생장치의 레이저다이오드 보호회로를 갖춘 APC(Automatic Power Control)장치의 회로 구성을 나타낸 도면.1 is a circuit diagram of an APC (Automatic Power Control) device having a laser diode protection circuit of an optical disc reproducing apparatus according to the present invention.
Claims (3)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1019940009285A KR950030070A (en) | 1994-04-29 | 1994-04-29 | Laser diode protection circuit of optical disc player |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1019940009285A KR950030070A (en) | 1994-04-29 | 1994-04-29 | Laser diode protection circuit of optical disc player |
Publications (1)
Publication Number | Publication Date |
---|---|
KR950030070A true KR950030070A (en) | 1995-11-24 |
Family
ID=66681986
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
KR1019940009285A KR950030070A (en) | 1994-04-29 | 1994-04-29 | Laser diode protection circuit of optical disc player |
Country Status (1)
Country | Link |
---|---|
KR (1) | KR950030070A (en) |
-
1994
- 1994-04-29 KR KR1019940009285A patent/KR950030070A/en not_active Application Discontinuation
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Legal Events
Date | Code | Title | Description |
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A201 | Request for examination | ||
E902 | Notification of reason for refusal | ||
E601 | Decision to refuse application |