JPS54116922A - Focal point detector - Google Patents
Focal point detectorInfo
- Publication number
- JPS54116922A JPS54116922A JP2377578A JP2377578A JPS54116922A JP S54116922 A JPS54116922 A JP S54116922A JP 2377578 A JP2377578 A JP 2377578A JP 2377578 A JP2377578 A JP 2377578A JP S54116922 A JPS54116922 A JP S54116922A
- Authority
- JP
- Japan
- Prior art keywords
- detector
- lens
- focal point
- outputs
- receptive
- 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
Landscapes
- Focusing (AREA)
- Automatic Focus Adjustment (AREA)
Abstract
PURPOSE: To provide a focal point detector, which is operative to detect the focal point highly accurately and to easily judge in which direction the lens is to be shifted, by using the dichroic aberration of the lens.
CONSTITUTION: If the outputs of both a detector 3 receptive of a red color only and a detector 4 receptive of a blue color are fed to their respective signal processing circuits, the outputs of these circuit are varied, as shown, in accordance with the deliver of a lens 1 while having different peak positions. With this in mind, the positions of the two detectors 3 and 4 are so preset that those two outputs becoms equal when the objective lens 1 is focused. Then, when the output of the detector 3 is higher, the objective lens 1 is delivered in, whereas when the output of the other detector 4 is higher the same lens 1 is delivered out. Thus, it is possible to detect the focal point in high accuracy.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2377578A JPS54116922A (en) | 1978-03-02 | 1978-03-02 | Focal point detector |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2377578A JPS54116922A (en) | 1978-03-02 | 1978-03-02 | Focal point detector |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS54116922A true JPS54116922A (en) | 1979-09-11 |
JPS6110044B2 JPS6110044B2 (en) | 1986-03-27 |
Family
ID=12119705
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2377578A Granted JPS54116922A (en) | 1978-03-02 | 1978-03-02 | Focal point detector |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54116922A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5944009A (en) * | 1982-09-06 | 1984-03-12 | Asahi Optical Co Ltd | Focusing detector |
JPS62188719U (en) * | 1986-05-22 | 1987-12-01 |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH07106036B2 (en) * | 1989-04-25 | 1995-11-13 | 松下電工株式会社 | Incandescent lamp lighting device |
JP2016126237A (en) | 2015-01-07 | 2016-07-11 | キヤノン株式会社 | Focus adjustment device and control method of the same |
-
1978
- 1978-03-02 JP JP2377578A patent/JPS54116922A/en active Granted
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5944009A (en) * | 1982-09-06 | 1984-03-12 | Asahi Optical Co Ltd | Focusing detector |
JPH0233124B2 (en) * | 1982-09-06 | 1990-07-25 | Asahi Optical Co Ltd | |
JPS62188719U (en) * | 1986-05-22 | 1987-12-01 |
Also Published As
Publication number | Publication date |
---|---|
JPS6110044B2 (en) | 1986-03-27 |
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