JPS616804U

JPS616804U - Prism for finder

Info

Publication number: JPS616804U
Application number: JP9047884U
Authority: JP
Inventors: 秀夫横田; 正猛加藤; 哲治西村
Original assignee: キヤノン株式会社
Priority date: 1984-06-18
Filing date: 1984-06-18
Publication date: 1986-01-16

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of the drawing]

第１図は本考案を電子カメラのファインダー光学系に適
用した場合の一実施例の光学系の概略図、第２図は本考
案の斜視図、第３図、第４図は各々本考案のゴースト像
の発生の説明図である。図中１は撮影レンズ、２は可動鏡、３はローバスフィル
ター、４はシャッターユニット、５は保護ガラス、６は
撮像面、７は撮影体のパッケージ、８は光路補正板、９
はフォー力シングスクリーン、１０は第１プリズム、１
１は第２プリ〆ム、１２は接眼レンズ、１３は瞳、ｓ１
，ｓ，は入視面、Ｓ２は第１反射面、８１′は第２反
射面、ｓ３，ｓ６は射出面、Ｓ５，８５′は反射面、
８４′は第４反射面である。Fig. 1 is a schematic diagram of an optical system of an embodiment in which the present invention is applied to a finder optical system of an electronic camera, Fig. 2 is a perspective view of the present invention, and Figs. 3 and 4 are each of the embodiments of the present invention. FIG. 3 is an explanatory diagram of the generation of a ghost image. In the figure, 1 is a photographic lens, 2 is a movable mirror, 3 is a low-pass filter, 4 is a shutter unit, 5 is a protective glass, 6 is an imaging surface, 7 is a package for the photographic object, 8 is an optical path correction plate, 9
is the force sing screen, 10 is the first prism, 1
1 is the second prism, 12 is the eyepiece, 13 is the pupil, s1
, s, is the entrance surface, S2 is the first reflective surface, 81' is the second reflective surface, s3, s6 are the exit surfaces, S5, 85' are the reflective surfaces,
84' is a fourth reflective surface.

Claims

[Scope of utility model registration request]

Incidence surface S1 for inputting a light beam for i-detecting an object image
and a first reflective surface S2 for reflecting the light beam incident from the incident surface S1 toward a second reflective surface S located on the same plane S81 as the incident surface S, the first reflective surface S2, and the second reflective surface. a first prism having an exit surface S3 for emitting the light beam reflected in the order of the surface S'; an entrance surface S for making the light beam exiting from the exit surface S3 of the first prism enter; and the input surface S'. A roof surface S' consisting of two reflecting surfaces S5, S,' for reflecting in the direction of the fourth reflecting surface 84' located on the same plane SSJ: as the surface SSJ: and the fourth reflecting surface 84' Exit surface S for emitting the light beam reflected in the order
6, and the exit surface S3 of the first prism and the entrance surface S of the second prism are separated by a slight air gap. .