Illumination device

Details Illumination device Illumination device

1994-05-23

1995-02-14

Cole, Richard R.

Illumination

Photographic lighting

Including specific light modifier

362330, 362339, F21V 1304

Patent

active

053900847

ABSTRACT:
An illumination device of this invention includes a flash light source for radiating flash light, a reflector, arranged on a side opposite to an object with respect to the flash light source, for reflecting a light beam radiated from the flash light source, and a refractor for projecting a light beam directly radiated from the flash light source and a light beam reflected by the reflector toward the object. The refractor adopts a Fresnel lens having a rotation-symmetrical shape with respect to its lens optical axis, a surface, on the object side, of the Fresnel lens is a flat surface perpendicular to the lens optical axis, and the other surface of the Fresnel lens is a Fresnel surface. The optical axes of the flash light source and the reflector are coaxial with each other, and define the reference optical axis of the illumination device. The lens optical axis is tilted at a predetermined angle from the reference optical axis, and the lens center of the Fresnel lens is shifted by a predetermined distance from a lens intersection as an intersection between the reference optical axis and the Fresnel lens.

REFERENCES:
patent: 3428800 (1969-02-01), Levin et al.
patent: 4017727 (1977-04-01), Yamamoto
patent: 4234906 (1980-11-01), Schindler
patent: 4317625 (1982-03-01), Van Allen
patent: 5083245 (1992-01-01), Fray et al.
patent: 5160192 (1992-11-01), Sughwarf

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