JPH0310311U - - Google Patents
Info
- Publication number
- JPH0310311U JPH0310311U JP2641890U JP2641890U JPH0310311U JP H0310311 U JPH0310311 U JP H0310311U JP 2641890 U JP2641890 U JP 2641890U JP 2641890 U JP2641890 U JP 2641890U JP H0310311 U JPH0310311 U JP H0310311U
- Authority
- JP
- Japan
- Prior art keywords
- objective lens
- detection means
- optical
- focusing
- axis direction
- 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.)
- Granted
Links
- 238000001514 detection method Methods 0.000 claims description 6
- 230000003287 optical effect Effects 0.000 claims description 6
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1990026418U JPH0643848Y2 (ja) | 1990-03-15 | 1990-03-15 | 光集束位置制御装置 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1990026418U JPH0643848Y2 (ja) | 1990-03-15 | 1990-03-15 | 光集束位置制御装置 |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0310311U true JPH0310311U (da) | 1991-01-31 |
JPH0643848Y2 JPH0643848Y2 (ja) | 1994-11-14 |
Family
ID=31529312
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1990026418U Expired - Lifetime JPH0643848Y2 (ja) | 1990-03-15 | 1990-03-15 | 光集束位置制御装置 |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0643848Y2 (da) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5189444A (da) * | 1974-12-23 | 1976-08-05 | ||
JPS5257803A (en) * | 1975-10-31 | 1977-05-12 | Thomson Brandt | Optical reader |
-
1990
- 1990-03-15 JP JP1990026418U patent/JPH0643848Y2/ja not_active Expired - Lifetime
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5189444A (da) * | 1974-12-23 | 1976-08-05 | ||
JPS5257803A (en) * | 1975-10-31 | 1977-05-12 | Thomson Brandt | Optical reader |
Also Published As
Publication number | Publication date |
---|---|
JPH0643848Y2 (ja) | 1994-11-14 |
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