Title:
接眼レンズを備えた一眼レフカメラ
Document Type and Number:
Japanese Patent JP4097932
Kind Code:
B2
Abstract:
A single-lens reflex camera provided with an eyepiece includes a screen on which an image of an object is projected, a plurality of reflecting surfaces for erecting the image projected on the screen, and an eyepiece with positive refracting power for observing the image. In this case, the eyepiece has, in order from the object side, a first lens component with positive refracting power, a second lens component with positive refracting power, and a third lens component with negative refracting power and satisfies the following conditions:where S is an angle made by the most off-axis chief ray passing through a point on an optical axis with the optical axis, at a distance of 23 mm along the optical axis from the exit surface of the third lens component, and refers to the angle at a diopter of 0 m<-1 >when the eyepiece is moved; fb is a length, in terms of air, from the screen to the entrance surface of the first lens component, and refers to the length, in terms of air, at a diopter of 0 m<-1 >when the eyepiece is moved; Y is a diagonal length of the image plane on the screen; f3 is the focal length of the third lens component; and f is the focal length of the entire system extending from the screen to the exit surface of the eyepiece, and refers to the focal length of the entire system at the diopter of 0 m<-1 >when the eyepiece is moved.
Inventors:
Koji Ogata
Application Number:
JP2001351638A
Publication Date:
June 11, 2008
Filing Date:
November 16, 2001
Export Citation:
Assignee:
Olympus Endo Technology America Inc.
International Classes:
G02B25/00; G03B13/06; G03B13/02
Domestic Patent References:
| JP2000180920A | ||||
| JP1108516A | ||||
| JP2000292714A | ||||
| JP63135914A |
Attorney, Agent or Firm:
Yasushi Shinohara
Masayuki Fujinaka
Masayuki Fujinaka