JPS55103512A - Focusing point detecting method of optical device - Google Patents
Focusing point detecting method of optical deviceInfo
- Publication number
- JPS55103512A JPS55103512A JP1081479A JP1081479A JPS55103512A JP S55103512 A JPS55103512 A JP S55103512A JP 1081479 A JP1081479 A JP 1081479A JP 1081479 A JP1081479 A JP 1081479A JP S55103512 A JPS55103512 A JP S55103512A
- Authority
- JP
- Japan
- Prior art keywords
- optical device
- imaging lens
- moire image
- overlapped
- focusing
- 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
- Focusing (AREA)
- Automatic Focus Adjustment (AREA)
Abstract
PURPOSE: To detect focusing of an optical device promptly and accurately from the appearing moire image interference fringe, by placing first and second charts having regular pattern on the imaging lens focal plane and subject position.
CONSTITUTION: A first chart 6 and a second chart 7 are placed on a focal plane 4 of an imaging lens 2 and a subject position 5. The respective charts are provided with regular patterns 61, 71, which should cause moire interference phenomenon when they are overlapped. A moire image 9 of good contrast appears when the two regular patterns to be overlapped are formed in the same pitch. There fore, since the moire image 9 appears only when correctly focused, the range finding precision similar to the required precision of the imaging lens may be obtained, so that the focusing of the optical device may be detected promptly and accurately.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1081479A JPS55103512A (en) | 1979-02-01 | 1979-02-01 | Focusing point detecting method of optical device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1081479A JPS55103512A (en) | 1979-02-01 | 1979-02-01 | Focusing point detecting method of optical device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS55103512A true JPS55103512A (en) | 1980-08-07 |
Family
ID=11760808
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1081479A Pending JPS55103512A (en) | 1979-02-01 | 1979-02-01 | Focusing point detecting method of optical device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55103512A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60207113A (en) * | 1984-03-30 | 1985-10-18 | Dainippon Screen Mfg Co Ltd | Method and device for moire prevention of image scanning recorder |
-
1979
- 1979-02-01 JP JP1081479A patent/JPS55103512A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60207113A (en) * | 1984-03-30 | 1985-10-18 | Dainippon Screen Mfg Co Ltd | Method and device for moire prevention of image scanning recorder |
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