JPS641123A - Optical head - Google Patents
Optical headInfo
- Publication number
- JPS641123A JPS641123A JP15578887A JP15578887A JPS641123A JP S641123 A JPS641123 A JP S641123A JP 15578887 A JP15578887 A JP 15578887A JP 15578887 A JP15578887 A JP 15578887A JP S641123 A JPS641123 A JP S641123A
- Authority
- JP
- Japan
- Prior art keywords
- piezoelectric actuator
- collimator lens
- detection
- section
- barrel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Lens Barrels (AREA)
- Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
- Optical Head (AREA)
Abstract
PURPOSE: To prevent occurrence of an error at read/write to/from a recording medium by providing a correction circuit giving a voltage of a fluctuation making the distance between a lighting section and a collimator lens constant to a piezoelectric actuator in response to the result of detection by a temperature detection section.
CONSTITUTION: A barrel 23 is expanded or contracted due to temperature change. In this case, the temperature change of the barrel 23 is detected by a temperature detection section 24 and the voltage given to a piezoelectric actuator 30 is corrected by a correction circuit 31 in response to the result of detection and the distance between the lighting section 20 and the collimator lens 27 is kept constant by the operation of the piezoelectric actuator 30. Thus, the laser beam passing through the collimator lens 27 is always a collimated beam to prevent the error at read/write.
COPYRIGHT: (C)1989,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62-155788A JPH011123A (en) | 1987-06-23 | optical head |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62-155788A JPH011123A (en) | 1987-06-23 | optical head |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS641123A true JPS641123A (en) | 1989-01-05 |
JPH011123A JPH011123A (en) | 1989-01-05 |
Family
ID=
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TR24402A (en) * | 1989-07-21 | 1991-09-01 | Thomson Brandt Gmbh | FOOT FOR AN OPTICAL ELEMENT |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TR24402A (en) * | 1989-07-21 | 1991-09-01 | Thomson Brandt Gmbh | FOOT FOR AN OPTICAL ELEMENT |
US5210649A (en) * | 1989-07-21 | 1993-05-11 | Deutsche Thomson-Brandt Gmbh | Mount for an optical element |
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