Automatic sunshade curtain with sustained state at transition
First Claim
1. A light-responsive control device, comprising:
- a photo-sensor mounted on a vehicle for generating a sensing signal in response to the intensity of an environmental light;
a first discriminating circuit electrically connected to said photo-sensor for generating a first triggering signal in response to a first comparing result of said sensing signal with a first reference signal, and a second triggering signal in response to a second comparing result of said sensing signal with said first reference signal;
a first drive circuit electrically connected to said first discriminating circuit and a motor for opening a sunshade curtain of said vehicle in response to said first triggering signal, and closing said sunshade curtain in response to said second triggering signal;
a first hold circuit electrically connected between said first discriminating circuit and said first drive circuit for holding said second triggering signal until said second comparing result is kept unchanged for a predetermined period in minute order.
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Accused Products
Abstract
A light-responsive controlling device for automatically controlling a headlamp and/or a sunshade curtain is disclosed. The control device includes a photo-sensor mounted on a vehicle for generating a sensing signal in response to the intensity of an environmental light, a discriminating circuit electrically connected to the photo-sensor for optionally generating a triggering signal according to a comparing result of the sensing signal with a reference signal, a hold circuit electrically connected to the discriminating circuit for outputting a confirming signal in response to the triggering signal uninterrupted for a predetermined period, and a drive circuit electrically connected to the hold circuit and a headlamp or a sunshade curtain of the vehicle for providing a drive current in response to the confirming signal for the headlamp to emit a certain level of light or for the sunshade curtain to perform opening/closing operations.
17 Citations
9 Claims
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1. A light-responsive control device, comprising:
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a photo-sensor mounted on a vehicle for generating a sensing signal in response to the intensity of an environmental light;
a first discriminating circuit electrically connected to said photo-sensor for generating a first triggering signal in response to a first comparing result of said sensing signal with a first reference signal, and a second triggering signal in response to a second comparing result of said sensing signal with said first reference signal;
a first drive circuit electrically connected to said first discriminating circuit and a motor for opening a sunshade curtain of said vehicle in response to said first triggering signal, and closing said sunshade curtain in response to said second triggering signal;
a first hold circuit electrically connected between said first discriminating circuit and said first drive circuit for holding said second triggering signal until said second comparing result is kept unchanged for a predetermined period in minute order. - View Dependent Claims (2, 3, 4, 5)
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6. A method for automatically switching a sunshade curtain of a vehicle between an open state and a closed state, comprising steps of
comparing the intensity of an environmental light with a first and a second threshold values; -
generating an open-state triggering signal when the intensity of said environmental light is greater than said first threshold value;
generating an closed-state triggering signal when the intensity of said environmental light is less than said second threshold value;
generating a confirmed closed-state triggering signal when the intensity of said environmental light is no greater than said first threshold value but no less than said second threshold value for a predetermined period;
switching said sunshade curtain to said open state in response to said open-state triggering signal, and keeping said oven state of said sunshade curtain unchanged until either of said closed-state triggering signal and said confirmed cloned-state triggering signal is asserted; and
switching said sunshade curtain to said closed state in response to either of said cloned-state triggering signal and said confirmed closed-state triggering signal. - View Dependent Claims (7, 8, 9)
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Specification