Hemispherical non-glare illuminator

Details Hemispherical non-glare illuminator Hemispherical non-glare illuminator

1990-05-15

1991-09-24

Lazarus, Ira S.

Illumination

Revolving

362335, 362355, 362268, 362331, F21V 704

Patent

active

050518720

ABSTRACT:
A translucent hemispherical diffuser provides shadowless, uniform illumination of an object to be inspected or otherwise viewed. The optical medium of the translucent diffuser has a milk glass optical consistency, and/or one or more surfaces of the diffuser may be textured to diffuse light entering or leaving the optical medium of the diffuser. The hemispherical diffuser is placed between a light source and the object to be viewed. Light from the light source entering the optical medium of the diffuser is re-radiated uniformly from the concave surface of the diffuser. The object to be viewed is located approximately at the center of curvature of the hemispherical diffuser. Thus, the radiating concave surface of the diffuser subtends a solid angle of approximately two -pi steradians. Light may be scattered and diffused by various reflecting surfaces external to the diffuser, prior to entering the optical medium of the diffuser. One embodiment of the diffuser includes reflecting surfaces as an integral part of the diffuser. Light sources may be remote lamp and fiber optical systems, or local, spirally wound neon tubes covering the diffuser. Each diffuser includes a viewing port for observing the illuminated object. The viewing port may have associated with it a beam splitter or half silvered mirror assembly to direct light toward the object to prevent an image of the port from being reflected by the object, and to pass light reflected by the object to a video camera or other viewing device.

REFERENCES:
patent: 1953299 (1934-04-01), Grant
patent: 3971621 (1976-07-01), Albrecht-Buehler
patent: 4266534 (1981-05-01), Ogawa
patent: 4428673 (1984-01-01), Yoshida
patent: 4455592 (1984-06-01), Martino
patent: 4460940 (1984-07-01), Mori
patent: 4635111 (1987-01-01), Moore
patent: 4677473 (1987-06-01), Okamoto et al.
patent: 4677531 (1987-06-01), Szeles
patent: 4882492 (1989-11-01), Schlager
patent: 4947030 (1990-08-01), Takahashi
patent: 4974919 (1990-12-01), Muraki et al.

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