Photometer having asymmetrical aperture and with compensation for direction of incidence
AssigneeOlympus Optical Co., Ltd.
InventorsToshihiro Imai, Toyotaka Yamada
Life of this patent
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Abstract
A photometer having asymmetrical apertures and with compensation for direction of incidence includes a photodetector, a mask having asymmetrical apertures and arranged before the photodetector and a compensation prism arranged either before or after the mask. The photometer is adapted to compensate for the difference in quantity of light incident on the photodetector caused by the mask depending on the difference in the direction of incidence of the light.
Claims6
A photometer comprising a photodetector, a mask having asymmetrical apertures and arranged before said photodetector, and a compensation prism arranged in the path of the light to be incident on said photodetector to compensate for the asymmetry of the light pencil which passes through said mask and is incident on said photodetector.
Dependencies are inferred from the claim text.