Camera provided with eyepiece

Details Camera provided with eyepiece Camera provided with eyepiece

2005-11-08

2005-11-08

Gray, David M. (Department: 2851)

Photography

Single lens reflex camera

C396S382000, C359S645000

Reexamination Certificate

active

06962447

ABSTRACT:
A camera includes a screen on which an image of an object is projected, a plurality of reflection surfaces for erecting the image on the screen, and an eyepiece system with positive refracting power for observing the image. In this case, the eyepiece system includes, 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. Spacings between the first lens component and the second lens component and between the second lens component and the third lens component are changed to thereby make a diopter adjustment, and the camera satisfies the following conditions:in-line-formulae description="In-line Formulae" end="lead"?0.15<tan(S)<0.35in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?2.00<fb/Y<4.00in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?−0.80<f3/f<−0.40in-line-formulae description="In-line Formulae" end="tail"?where S is an angle, at a diopter of 0 m−1, made by the most off-axis chief ray passing through a point on the optical axis at a distance of 23 mm along the optical axis from the exit surface of the third lens component with the optical axis; fb is an air-equivalent length, at a diopter of 0 m−1, from the screen to the entrance surface of the first lens component; Y is a diagonal length of the picture plane on the screen; f3is the focal length of the third lens component; and f is the focal length, at a diopter of 0 m−1, of the entire system from the screen to the exit surface of the eyepiece system.

REFERENCES:
patent: 4047222 (1977-09-01), Moskovich et al.
patent: 5663834 (1997-09-01), Koizumi
patent: 6692163 (2004-02-01), Ogata
patent: 6804462 (2004-10-01), Ogata et al.
patent: 63-135914 (1988-06-01), None
patent: 11-33847 (1999-12-01), None

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