Light-receiving device for use with the exposure meter in single lens reflex camera
First Claim
1. In a single lens reflex camera having a finder optical system, an objective lens, and a meter device including a light receiving portion:
- a. a principal mirror for reflecting part of the light passing through said objective lens toward said finder optical system and for transmitting therethrough the remainder of said light;
b. first optical means including a reflector member and disposed between said principal mirror and the focal plane of the objective lens and in inclined relationship with respect to the optical axis of said objective lens;
c. a condensing mirror extending between the image of an object formed by and between said objective lens and said first optical means and the light-receiving portion of said metering device; and
d. an image-forming half-lens provided on said condensing mirror to condense said image of the object toward said light-receiving portion of said metering device by cooperating with said condensing mirror, the optical axis of said half-lens being substantially coincident with the reflecting surface of said condensing mirror.
1 Assignment
0 Petitions
Accused Products
Abstract
In a single lens reflex camera having a metering device, a principal mirror is provided for reflecting part of the light passing through an objective lens toward a finder optical system and for transmitting therethrough the remainder of the light. First optical means including a reflector member are disposed between the principal mirror and photographic film in inclined relationship with the optical axis of the objective lens. A condensing mirror extends between the image of an object formed by the objective lens and the first optical means and the light-receiving portion of the metering device. An image-forming half-lens is provided on the condensing mirror to condense the image of the object toward the light-receiving portion by cooperating with the condensing mirror. The optical axis of the half-lens is substantially coincident with the reflecting surface of the condensing mirror.
8 Citations
7 Claims
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1. In a single lens reflex camera having a finder optical system, an objective lens, and a meter device including a light receiving portion:
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a. a principal mirror for reflecting part of the light passing through said objective lens toward said finder optical system and for transmitting therethrough the remainder of said light; b. first optical means including a reflector member and disposed between said principal mirror and the focal plane of the objective lens and in inclined relationship with respect to the optical axis of said objective lens; c. a condensing mirror extending between the image of an object formed by and between said objective lens and said first optical means and the light-receiving portion of said metering device; and d. an image-forming half-lens provided on said condensing mirror to condense said image of the object toward said light-receiving portion of said metering device by cooperating with said condensing mirror, the optical axis of said half-lens being substantially coincident with the reflecting surface of said condensing mirror. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification