JPS5550228A - Focus plate - Google Patents
Focus plateInfo
- Publication number
- JPS5550228A JPS5550228A JP12394478A JP12394478A JPS5550228A JP S5550228 A JPS5550228 A JP S5550228A JP 12394478 A JP12394478 A JP 12394478A JP 12394478 A JP12394478 A JP 12394478A JP S5550228 A JPS5550228 A JP S5550228A
- Authority
- JP
- Japan
- Prior art keywords
- slopes
- rough surface
- focal
- light
- angle
- 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
Abstract
PURPOSE: To increase the brightness of imaging plane and improve resolution by forming the surface with a rough surface of the specified shape and size.
CONSTITUTION: If the surface of the focal plane such as of synthetic resin plate or other is made to a rough surface formed by the quadrangular pyramids of 0.0015± 0.0003mm in the height h of crests and 9.6°±3° in the angle α of inclination of slopes, then the incident light within the specified critical angle refracts without reflecting on the slopes and the reflection and refraction of light are accomplished at high efficiency, thus the entire part of the focal plate appears bright and the fine images may be distinctly viewed.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12394478A JPS5550228A (en) | 1978-10-06 | 1978-10-06 | Focus plate |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12394478A JPS5550228A (en) | 1978-10-06 | 1978-10-06 | Focus plate |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5550228A true JPS5550228A (en) | 1980-04-11 |
Family
ID=14873204
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP12394478A Pending JPS5550228A (en) | 1978-10-06 | 1978-10-06 | Focus plate |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5550228A (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5730823A (en) * | 1980-07-31 | 1982-02-19 | Nippon Kogaku Kk <Nikon> | Focal plate of camera |
JPS5875927U (en) * | 1981-11-18 | 1983-05-23 | ヤンマーディーゼル株式会社 | fuel injector |
JPS58207032A (en) * | 1982-05-27 | 1983-12-02 | Nippon Kogaku Kk <Nikon> | Focusing screen |
JPS60114834A (en) * | 1983-11-26 | 1985-06-21 | Olympus Optical Co Ltd | Reticle and its production |
US4632531A (en) * | 1984-10-22 | 1986-12-30 | Nippon Kogaku K. K. | Focusing screen |
US4946252A (en) * | 1987-08-05 | 1990-08-07 | Asahi Kogaku Kogyo Kabushiki Kaisha | Focusing screen |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4520851Y1 (en) * | 1967-03-28 | 1970-08-20 |
-
1978
- 1978-10-06 JP JP12394478A patent/JPS5550228A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4520851Y1 (en) * | 1967-03-28 | 1970-08-20 |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5730823A (en) * | 1980-07-31 | 1982-02-19 | Nippon Kogaku Kk <Nikon> | Focal plate of camera |
US4352547A (en) * | 1980-07-31 | 1982-10-05 | Nippon Kogaku K.K. | Focusing screen of a camera |
JPS5875927U (en) * | 1981-11-18 | 1983-05-23 | ヤンマーディーゼル株式会社 | fuel injector |
JPS6132110Y2 (en) * | 1981-11-18 | 1986-09-18 | ||
JPS58207032A (en) * | 1982-05-27 | 1983-12-02 | Nippon Kogaku Kk <Nikon> | Focusing screen |
JPS60114834A (en) * | 1983-11-26 | 1985-06-21 | Olympus Optical Co Ltd | Reticle and its production |
JPH037924B2 (en) * | 1983-11-26 | 1991-02-04 | Olympus Optical Co | |
US4632531A (en) * | 1984-10-22 | 1986-12-30 | Nippon Kogaku K. K. | Focusing screen |
US4946252A (en) * | 1987-08-05 | 1990-08-07 | Asahi Kogaku Kogyo Kabushiki Kaisha | Focusing screen |
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