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US 8,297,755 B2Granted
Laser projector with alerting light
AssigneeKoninklijke Philips Electronics N.V.
InventorArnd Ritz
Life of this patent
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Abstract
A projector with a laser light source projects an image. In order to reduce the risk for a person to be exposed to harmful levels of laser light, the projector also projects a time-variant alerting image into an alerting region. Alerting region is arranged outside of the projection region. The alerting image is of a wave length visible to the human eye, and of an intensity of eye-safe level.
Claims13
Projector comprising:
- a laser light source (16),
- modulation and projections means for modulating the light from said laser light source (16) and projecting said light into a direction within a projection region to generate a projected image (12) filling said projection region,
- and means for projecting an alerting image (22 ) into a direction of an alerting region (20) outside of said projection region (12), where the alerting light used for generating said alerting image (22) is of a wavelength visible to the human eye, and of an intensity of eye-safe level,
- wherein said alerting light used for generating said alerting image (22) originates from said laser light source.
1 more element
Method for operating a projector, where
- laser light is generated and projected into a direction of a projection region (12) to generate a projected image (12) filling said projection region,
- and an alerting image (22) is projected into a direction outside of said projection region,
- where the alerting light used to generate said alerting image of a wave length visible to the human eye, and of an intensity of eye-safe level,
- wherein said alerting light used for generating said alerting image(22) originates from said laser light source.
1 more element
Dependencies are inferred from the claim text.