Light detecting and angle of view compensation for optical devices and method
First Claim
1. A control for a controllable optical device, comprisingan auto-darkening lens,a sensor to sense the incident direction of incident light toward the auto-darkening lens,a control circuit responsive to incident direction information to provide for control of the auto-darkening lens,wherein the control circuit provides for shade adjustment control for the auto-darkening lens to maintain at least a desired light attenuation shade for different directions of incident light,said sensor comprising a photosensor, said photosensor comprising a plurality of photosensors, andfurther comprising a light restricting opening limiting the direction at which light may impinge on one or more of said photosensors.
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Accused Products
Abstract
A control for a controllable optical device, such as an auto-darkening lens (ADL), such as used in welding helmets, respirators, or other device, includes a sensor sensing the direction of incident light and a control circuit responsive to incident direction information to provide for control of the optical device. Based on at least one of incident direction of light and light intensity a the shade characteristics of the ADL or the like can be controlled and maintained while a person wearing the ADL may move the head to different orientations. Several fixed photosensor arrangements and dynamic systems may be used to sense incident light direction and whether the incident light is a point source. A method of detecting direction of incident light and whether the incident light is from a point source, and of controlling an ADL or the like based on direction and/or intensity of incident light.
50 Citations
16 Claims
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1. A control for a controllable optical device, comprising
an auto-darkening lens, a sensor to sense the incident direction of incident light toward the auto-darkening lens, a control circuit responsive to incident direction information to provide for control of the auto-darkening lens, wherein the control circuit provides for shade adjustment control for the auto-darkening lens to maintain at least a desired light attenuation shade for different directions of incident light, said sensor comprising a photosensor, said photosensor comprising a plurality of photosensors, and further comprising a light restricting opening limiting the direction at which light may impinge on one or more of said photosensors.
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7. A control for a controllable optical device, comprising
an auto-darkening lens, a sensor to sense the incident direction of incident light toward the auto-darkening lens, a control circuit responsive to incident direction information to provide for control of the auto-darkening lens, wherein the control circuit provides for shade adjustment control for the auto-darkening lens to maintain at least a desired light attenuation shade for different directions of incident light, said sensor comprising a photosensor, said photosensor comprising a plurality of photosensors, and further comprising a lens for restricting the direction at which light impinges on the photosensors.
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8. A control for a controllable optical device, comprising
an auto-darkening lens, a sensor to sense the incident direction of incident light toward the auto-darkening lens, a control circuit responsive to incident direction information to provide for control of the auto-darkening lens, wherein the control circuit provides for shade adjustment control for the auto-darkening lens to maintain at least a desired light attenuation shade for different directions of incident light, said sensor comprising a photosensor, and further comprising a shutter to control light incident on the sensor.
Specification