JPS5550228A - Focus plate - Google Patents

Focus plate

Info

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
Application number
JP12394478A
Other languages
Japanese (ja)
Inventor
Mitsuhisa Fukuda
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ricoh Co Ltd
Original Assignee
Ricoh Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP12394478A priority Critical patent/JPS5550228A/en
Publication of JPS5550228A publication Critical patent/JPS5550228A/en
Pending legal-status Critical Current

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
JP12394478A 1978-10-06 1978-10-06 Focus plate Pending JPS5550228A (en)

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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4520851Y1 (en) * 1967-03-28 1970-08-20

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4520851Y1 (en) * 1967-03-28 1970-08-20

Cited By (9)

* Cited by examiner, † Cited by third party
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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