Flash illumination system and method incorporating indirect refl

Details Flash illumination system and method incorporating indirect refl Flash illumination system and method incorporating indirect refl

1991-08-26

1992-08-04

Adams, Russell E.

3541491, G03B 1503

Patent

active

051363127

ABSTRACT:
A flash system and method for providing artificial illumination for image capture wherein a source of flash illumination operates selectively in a first mode for projecting light in a first direction toward an indirect reflecting surface to illuminate a subject indirectly and in a second mode for projecting light in a second direction to illuminate the subject directly, electromagnetic radiation reflected directly from the indirect reflecting surface is sensed directly to provide a signal containing information about the indirect reflecting surface, and the information contained in the signal is utilized to control the selective projection of light in the first and second directions to control the quantities of indirect and direct light which illuminate the subject. In one aspect, electromagnetic radiation such as infrared radiation is transmitted to the indirect reflecting surface in a manner such that a portion of the radiation is reflected from the surface back to the flash system where it is detected to provide a signal containing information relating to the distance between the surface and a given location in the flash system. In another aspect, light reflected directly from the indirect reflecting surface during operation of the source in the first or indirect flash mode is received directly by a sensor in the system to provide a signal indicating the presence of the indirect reflecting surface.

REFERENCES:
patent: 4242616 (1980-12-01), Takematsu
patent: 4384238 (1983-05-01), Greenwald et al.
patent: 4415247 (1983-11-01), Takematsu

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