JPS5754931A - View finder for single-lens reflex camera - Google Patents

View finder for single-lens reflex camera

Info

Publication number
JPS5754931A
JPS5754931A JP13052980A JP13052980A JPS5754931A JP S5754931 A JPS5754931 A JP S5754931A JP 13052980 A JP13052980 A JP 13052980A JP 13052980 A JP13052980 A JP 13052980A JP S5754931 A JPS5754931 A JP S5754931A
Authority
JP
Japan
Prior art keywords
lens
negative lens
eyepiece
positive
focal
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
Application number
JP13052980A
Other languages
Japanese (ja)
Other versions
JPS6119017B2 (en
Inventor
Yutaka Iizuka
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.)
Nikon Corp
Original Assignee
Nikon Corp
Nippon Kogaku KK
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 Nikon Corp, Nippon Kogaku KK filed Critical Nikon Corp
Priority to JP13052980A priority Critical patent/JPS5754931A/en
Publication of JPS5754931A publication Critical patent/JPS5754931A/en
Publication of JPS6119017B2 publication Critical patent/JPS6119017B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B19/00—Cameras
    • G03B19/02—Still-picture cameras
    • G03B19/12—Reflex cameras with single objective and a movable reflector or a partly-transmitting mirror

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Viewfinders (AREA)
  • Lenses (AREA)

Abstract

PURPOSE:To shorten a focal distance of an eyepiece system, and also to prevent a drop of the scale factor of a magnifier, by placing composite positive lens component and negative lens component so as to leave a large air gap. CONSTITUTION:A light beam refracted and reflected by a photographing lens and a spring-up mirror which are not shown in the figure forms an image on a focal surface 1a of a focal plate 1, and after that, reaches an eyepiece 10 consisting of a positive lens 5 and a negative lens 6 through a condenser lens 2, a prism 3 and a pentagonal Dachprisma 4, and the image on the focal surface 1a is observed by a naked eye 7 placed on the eyepoint. The prism 4 serves as range finding or photometry, by a half mirror 3a, etc. provided on the inside thereof. The shaded portion of the figure shows an information processing member such as an optical system, an electric system, a hardware member, etc. for range finding or photometry. The positive lens component 5 constituting the eyepiece 10 is a compositive positive glued lens which has glued a biconvex positive lens and a negative lens, and the negative lens component 6 is a single negative lens.
JP13052980A 1980-09-19 1980-09-19 View finder for single-lens reflex camera Granted JPS5754931A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13052980A JPS5754931A (en) 1980-09-19 1980-09-19 View finder for single-lens reflex camera

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13052980A JPS5754931A (en) 1980-09-19 1980-09-19 View finder for single-lens reflex camera

Publications (2)

Publication Number Publication Date
JPS5754931A true JPS5754931A (en) 1982-04-01
JPS6119017B2 JPS6119017B2 (en) 1986-05-15

Family

ID=15036472

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13052980A Granted JPS5754931A (en) 1980-09-19 1980-09-19 View finder for single-lens reflex camera

Country Status (1)

Country Link
JP (1) JPS5754931A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4000448A1 (en) * 1989-01-09 1990-07-12 Asahi Optical Co Ltd Optical system with view finder - and penta-mirror has two plastic lenses of specified parameters
US5136427A (en) * 1989-01-09 1992-08-04 Asahi Kogaku K.K. Optical system for use with a viewfinder
KR20000059525A (en) * 1999-03-04 2000-10-05 윤종용 Optical system having a high magnification viewfinder lens

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4000448A1 (en) * 1989-01-09 1990-07-12 Asahi Optical Co Ltd Optical system with view finder - and penta-mirror has two plastic lenses of specified parameters
JPH02181713A (en) * 1989-01-09 1990-07-16 Asahi Optical Co Ltd Finder optical system
US5136427A (en) * 1989-01-09 1992-08-04 Asahi Kogaku K.K. Optical system for use with a viewfinder
KR20000059525A (en) * 1999-03-04 2000-10-05 윤종용 Optical system having a high magnification viewfinder lens

Also Published As

Publication number Publication date
JPS6119017B2 (en) 1986-05-15

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