JPH01121120U - - Google Patents
Info
- Publication number
- JPH01121120U JPH01121120U JP1681288U JP1681288U JPH01121120U JP H01121120 U JPH01121120 U JP H01121120U JP 1681288 U JP1681288 U JP 1681288U JP 1681288 U JP1681288 U JP 1681288U JP H01121120 U JPH01121120 U JP H01121120U
- Authority
- JP
- Japan
- Prior art keywords
- focusing lens
- focus error
- detection device
- error detection
- split photodetector
- 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
- 238000001514 detection method Methods 0.000 claims description 4
- 230000003287 optical effect Effects 0.000 claims description 2
- 238000000034 method Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- Optical Recording Or Reproduction (AREA)
Description
第１図および第２図は本考案のフオーカスエラ
ー検出装置の一実施例を示す構成図、第３図およ
び第４図は従来のフオーカスエラー検出装置の一
例を示す構成図である。
１……集束レンズ、１２……光軸、２……２分
割光検出器、３……ナイフエツジ、４……遮光膜
、４１……エツジ部分。
1 and 2 are block diagrams showing an embodiment of the focus error detection device of the present invention, and FIGS. 3 and 4 are block diagrams showing an example of a conventional focus error detection device. DESCRIPTION OF SYMBOLS 1... Focusing lens, 12... Optical axis, 2... 2-split photodetector, 3... Knife edge, 4... Light shielding film, 41... Edge portion.
Claims (1)
してナイフエツジ法によりフオーカスエラーを検
出するようにしたフオーカスエラー検出装置にお
いて、前記集束レンズにおける前記２分割光検出
器側の表面に直線状のエツジ部分がこの集束レン
ズの光軸を通るように位置決めされた遮光膜を形
成するようにしてなるフオーカスエラー検出装置
。 In a focus error detection device, a two-split photodetector is arranged at the focal point of a focusing lens, and a focus error is detected by a knife edge method, in which a straight line is formed on the surface of the focusing lens on the side of the two-split photodetector. A focus error detection device formed by forming a light-shielding film positioned so that the edge portion of the focusing lens passes through the optical axis of the focusing lens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1681288U JPH01121120U (en) | 1988-02-10 | 1988-02-10 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1681288U JPH01121120U (en) | 1988-02-10 | 1988-02-10 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01121120U true JPH01121120U (en) | 1989-08-16 |
Family
ID=31230061
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1681288U Pending JPH01121120U (en) | 1988-02-10 | 1988-02-10 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01121120U (en) |
-
1988
- 1988-02-10 JP JP1681288U patent/JPH01121120U/ja active Pending
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