Light detector having light sensor and light indicator, and control circuit thereof
First Claim
1. A light detector comprising:
- light indicator means for radiating light, the light indicator means initiating radiation of light therefrom when ambient light is below a prescribed level;
light sensor means for receiving actual light including ambient light and the light from the light indicator means for outputting a detection signal corresponding to a level of the actual light,the light indicator responding to the light sensor; and
control circuit means for evading effect of the light from the light indicator means for controlling the light indicator means while ambient light is below the prescribed level even though the actual light received by the light sensor increases above the prescribed level by the radiation of light from the light indicator means.
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Accused Products
Abstract
A light detector which indicates decrease in the level of ambient light below a prescribed value. The light detector includes a light indicator for radiating light when the level of ambient light decreases below the prescribed value, a light sensor arranged parallel to the light indicator for receiving actual light including ambient light and light from the light indicator for outputting a detection signal corresponding to a level of actual light, and a control circuit for evading effect of the light from the light indicator for controlling the operation of the light indicator while ambient light is below the prescribed level even though the actual light received by the light sensor increases above the prescribed level.
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Citations
17 Claims
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1. A light detector comprising:
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light indicator means for radiating light, the light indicator means initiating radiation of light therefrom when ambient light is below a prescribed level; light sensor means for receiving actual light including ambient light and the light from the light indicator means for outputting a detection signal corresponding to a level of the actual light, the light indicator responding to the light sensor; and control circuit means for evading effect of the light from the light indicator means for controlling the light indicator means while ambient light is below the prescribed level even though the actual light received by the light sensor increases above the prescribed level by the radiation of light from the light indicator means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A light detector comprising:
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a base; a light indicator arranged on the base for radiating light; a light sensor disposed on the base substantially in parallel to the light indicator for receiving actual light including ambient light and light from the light indicator for detecting the level of the actual light; and a control circuit arranged in the base for controlling the operation of the light indicator in response to the light sensor. - View Dependent Claims (14, 15, 17)
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16. A system for a light detector having a light indicator for radiating light, and a light sensor disposed substantially parallel to the light indicator for receiving an actual light including ambient light and light from the light indicator for detecting a level of the actual light, comprising:
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an object to be identified; DC power source for supplying DC power to the light detector; power switch means for selectively connecting the DC power source with the light detector; operation switch means connected in parallel with the light detector, the operation switch being connected to the DC power source through the power switch, the light detector being activated when the operation switch means is opened, the operation switch being closed when the light indicator radiates light therefrom; and a visible location indicator attached to the object for indicating the location of the object, the location indicator being activated when the operation switch is closed.
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Specification