Reflecting mirror device in a single lens reflex camera
AssigneeNippon Kogaku K.K.
InventorToru Fukuhara
Life of this patent
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Abstract
This specification discloses a reflecting mirror device in a single lens reflex camera for receiving light passed through the picture-taking lens of the camera during finder observation, the reflecting mirror device reflecting said light and directing it to a finder optical system, while, at the same time, passing therethrough part of said light and directing it to the light-receiving portion of a metering system. The reflecting mirror device has a number of pin-holes irregularly arranged on the reflecting surface thereof.
Claims7
A reflecting mirror device in a single lens reflex camera for receiving light passed through the picture-taking lens of the camera during finder observation, said reflecting mirror device reflecting said light and directing it to a finder optical system such as a finder screen while, at the same time, passing therethrough part of said light and directing it to the light-receiving portion of a metering system, said reflecting mirror device having a number of pin-holes irregularly arranged on the reflecting surface thereof, each of said pin-holes having a cross sectional area of the order of 8.times.10.sup.-5 -8.times.10.sup.-3 mm.sup.2 whereby it is minute enough so that it is not recognized as a shadow in a finder image and large enough so that the phenomenon of light diffraction created by each pin-hole is not recognized as a flare in the finder image.
Dependencies are inferred from the claim text.