Method of and an apparatus for producing a required visual signa

Details Method of and an apparatus for producing a required visual signa Method of and an apparatus for producing a required visual signa

1989-10-04

1991-03-05

Haroian, Harry N.

Optics: image projectors

Miscellaneous

353121, G03B 2100

Patent

active

049972715

ABSTRACT:
A required visual signal for direct observation is produced from a first source of light in the presence of a second source of light, such as ambient light. Light is transmitted from the first source to a defined surface or defined region distant from the first source. A means for modulating light is operated between at least a first mode and a second mode. This operation is synchronized with a varying of the intensity of at least one of the sources of light at or above a given frequency equal to or greater than the critical fusion frequency for the size and luminance of the required visual signal. When the modulating means is in the first mode, this allows the required visual signal to be directly observed on the defined surface or in the defined region. When the modulating means is in the second mode, this allows the effect produced by any light from the second source incident on the defined surface or in the defined region to be reduced.

REFERENCES:
patent: 4072411 (1978-02-01), Frank et al.

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