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US 5,851,740 AGranted
Speckleless illumination of objects by laser light results when the laser light is transmitted or is reflected by a moving diffuser
OwnerGeorge M. Sawyerinventor
Life of this patent
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Abstract
When laser light is transmitted by or reflected by a diffuser onto an object being illuminated, the object is not evenly illuminated, but is speckled with large speckles. The invention uses a moving diffuser which reduces the sizes of the speckles when the object is visually observed, and eliminates the speckles when a photographic film or plate is located at the object position and records the laser light.
Claims13
In the prior art, when laser light, reflected by a stationary-diffuse-element, illuminates a subject,
- an undesirable and unevenly illuminated subject results that is in the form of a speckled pattern of light and dark areas,
- said undesirable and unevenly illuminated subject is obviated by an inventive step,
- said inventive step replaces the stationary-diffuse-element by a moving-diffuse-element resulting in a desirable and evenly illuminated subject.
In the prior art, when laser light, transmitted by a stationary-diffuse-element, illuminates a subject being photographed,
- an undesirable and unevenly illuminated subject results that is in the form of a speckled pattern of light and dark areas, said undesirable and unevenly illuminated subject is obviated by an inventive step,
- said inventive step replaces the stationary-diffuse-element by a moving-diffuse-element resulting in a desirable and evenly illuminated subject, and said subject is imaged on a photo-sensitive element.
Dependencies are inferred from the claim text.