Outdoor lighting controller including wiper element for light sensor
First Claim
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1. A controller for an outdoor light source comprising:
- a voltage source;
a first Schmitt trigger connected to said voltage source and provided with a light sensing element for sensing the variation in ambient light, said first Schmitt trigger enabled when the level of ambient light falls below a predetermined value;
a charging-discharging circuit functioning as a time delay circuit connected to the output of said first Schmitt trigger, said charging-discharging circuit provided with an energy storage device for accumulating energy when said first Schmitt trigger is enabled;
a second Schmitt trigger circuit connected to the output of said charging-discharging circuit for activating the outdoor light source utilizing the energy accumulated in said charging-discharging circuit; and
a wiping device for removing accumulated dust from said light sensing element, said wiping device includinga motor;
means for energizing said motor when said first and second Schmitt triggers are enabled; and
a cap member connected to said motor for rotation across said light sensing element.
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Abstract
An outdoor lighting controller including a light sensing element for automatically activating and de-activating an outdoor light source. A wiper is provided for removing accumulated dust from the light sensing element. The wiper is initiated when the light source is activated.
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Citations
8 Claims
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1. A controller for an outdoor light source comprising:
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a voltage source; a first Schmitt trigger connected to said voltage source and provided with a light sensing element for sensing the variation in ambient light, said first Schmitt trigger enabled when the level of ambient light falls below a predetermined value; a charging-discharging circuit functioning as a time delay circuit connected to the output of said first Schmitt trigger, said charging-discharging circuit provided with an energy storage device for accumulating energy when said first Schmitt trigger is enabled; a second Schmitt trigger circuit connected to the output of said charging-discharging circuit for activating the outdoor light source utilizing the energy accumulated in said charging-discharging circuit; and a wiping device for removing accumulated dust from said light sensing element, said wiping device including a motor; means for energizing said motor when said first and second Schmitt triggers are enabled; and a cap member connected to said motor for rotation across said light sensing element. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification