Illumination apparatus

Details Illumination apparatus Illumination apparatus

1995-06-05

1998-02-17

Quach, Y My

Illumination

Light source and modifier

Including reflector

362268, 362269, F21V 700

Patent

active

057185034

ABSTRACT:
An illumination apparatus is disclosed which efficiently irradiates an irradiation surface without destroying the symmetry of an illuminance distribution at the irradiation surface. A light source is displaced from a center of curvature of a spherical mirror in a direction in a displacement plane which includes an axis of symmetry of the spherical mirror so as to form a light source image at a position off the light source. Due to this, a ray from the spherical mirror passes off the light source (i.e., the position of the light source image), and therefore, a reflection ray is not shielded, absorbed nor otherwise disturbed by the light source, which in turn prevents deterioration in the efficiency of utilization of light. Further, the light source, the spherical minor and the lens are assembled into a light source unit which is inclined at an angle about a principal point of the lens with respect to a central axis of the irradiation surface and displaced a certain distance in a displacement direction which is perpendicular to the central axis. Hence, the illuminance distribution at the irradiation surface is adjusted and the symmetry of the illuminance distribution at the irradiation surface is improved.

REFERENCES:
patent: 1124051 (1915-01-01), Matisse
patent: 3375362 (1968-03-01), Klippert
Soviet Inventions Illustrated, PQ Section, Week 8422, Sep. 7, 1983. Derwent Publications Ltd., London & SU-A-1039 886.
Patent Abstracts of Japan, vol. 15, no. 67, Feb. 18, 1991; p. 30 P1167; & JP A 02 289 834.

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