JPS5667822A - Focal diaphragm - Google Patents
Focal diaphragmInfo
- Publication number
- JPS5667822A JPS5667822A JP14397179A JP14397179A JPS5667822A JP S5667822 A JPS5667822 A JP S5667822A JP 14397179 A JP14397179 A JP 14397179A JP 14397179 A JP14397179 A JP 14397179A JP S5667822 A JPS5667822 A JP S5667822A
- Authority
- JP
- Japan
- Prior art keywords
- range finding
- prism
- lens
- light beams
- finding part
- 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
- Diffracting Gratings Or Hologram Optical Elements (AREA)
- Viewfinders (AREA)
Abstract
PURPOSE: To obtain a focal diaphragm having the range finding part by which focusing can be made easily, by providing an uneven body having a finer structure than the prism constituting the split image type range finding part, on said prism.
CONSTITUTION: The prism-form structure body 2 having the prescribed diffraction in the range finding part effectively leads the light beams 9, 10 being at angles of 4° and 6° to the optical axis among the luminous flux from the photographic lens 8, to the eyepiece mainly. Also, the other prism structure body 3 leads a light beam from the opposite direction against the optical axis, to the eyepiece. In this way, since two light beams 9, 10 from the lens exit pupil are utilized, as for a bright lens having small F No., the range finding of high accuracy can be performed by use of both the light beams 9, 10, and as for a dark lens having large F No., it is possible to find the range by use of the light beam 9. In this way, a focal diaphragm having the range finding part by which focusing can be made easily can be obtained.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14397179A JPS5667822A (en) | 1979-11-07 | 1979-11-07 | Focal diaphragm |
GB8035647A GB2065919B (en) | 1979-11-07 | 1980-11-06 | Focussing screen |
DE19803041969 DE3041969A1 (en) | 1979-11-07 | 1980-11-06 | ADJUSTING DISC |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14397179A JPS5667822A (en) | 1979-11-07 | 1979-11-07 | Focal diaphragm |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5667822A true JPS5667822A (en) | 1981-06-08 |
JPH0323896B2 JPH0323896B2 (en) | 1991-03-29 |
Family
ID=15351311
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP14397179A Granted JPS5667822A (en) | 1979-11-07 | 1979-11-07 | Focal diaphragm |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5667822A (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5816220A (en) * | 1981-07-22 | 1983-01-29 | Olympus Optical Co Ltd | Forcusing screen |
JPS58117511A (en) * | 1981-12-30 | 1983-07-13 | Fujitsu Ltd | Diffraction grating |
JP2005196930A (en) * | 2003-12-12 | 2005-07-21 | Konica Minolta Opto Inc | Diffractive optical element and optical pickup device |
JP2006285011A (en) * | 2005-04-01 | 2006-10-19 | Canon Inc | Diffraction optical element, metal mold for molding diffraction optical element, method for manufacturing diffraction optical element, and method for manufacturing metal mold for molding diffraction optical element |
JP2019215498A (en) * | 2018-06-14 | 2019-12-19 | 大日本印刷株式会社 | Light modulation element and information recording medium |
JP2021170124A (en) * | 2017-09-08 | 2021-10-28 | 大日本印刷株式会社 | Optical modulation element and information recording medium |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5216226A (en) * | 1975-07-28 | 1977-02-07 | Canon Inc | Focusing device |
-
1979
- 1979-11-07 JP JP14397179A patent/JPS5667822A/en active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5216226A (en) * | 1975-07-28 | 1977-02-07 | Canon Inc | Focusing device |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5816220A (en) * | 1981-07-22 | 1983-01-29 | Olympus Optical Co Ltd | Forcusing screen |
JPS58117511A (en) * | 1981-12-30 | 1983-07-13 | Fujitsu Ltd | Diffraction grating |
JP2005196930A (en) * | 2003-12-12 | 2005-07-21 | Konica Minolta Opto Inc | Diffractive optical element and optical pickup device |
JP2006285011A (en) * | 2005-04-01 | 2006-10-19 | Canon Inc | Diffraction optical element, metal mold for molding diffraction optical element, method for manufacturing diffraction optical element, and method for manufacturing metal mold for molding diffraction optical element |
JP4587172B2 (en) * | 2005-04-01 | 2010-11-24 | キヤノン株式会社 | Diffractive optical element, diffractive optical element manufacturing method, and diffractive optical element molding die manufacturing method |
JP2021170124A (en) * | 2017-09-08 | 2021-10-28 | 大日本印刷株式会社 | Optical modulation element and information recording medium |
JP2019215498A (en) * | 2018-06-14 | 2019-12-19 | 大日本印刷株式会社 | Light modulation element and information recording medium |
Also Published As
Publication number | Publication date |
---|---|
JPH0323896B2 (en) | 1991-03-29 |
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