Optical switch for an automatic door
First Claim
1. A passive optical switch for an automatic door for automatically opening and closing a door, by sensing the direction of movement of passing bodies within a sensing area, comprising:
- light receiving means having at least two groups of optical fiber cables, each group having first and second ends, the first ends forming light receiving surfaces, wherein each surface is positioned to receive light from a different portion of a sensing area;
phototube cell converter means, conncected to the second ends of the optical fiber cables, for producing a separate indication signal, for each light receiving surface, which has a characteristic indicative of the intensity of light received by that light receiving surface; and
direction discriminator circuit means for receiving said separate indication signals and for producing a control signal for driving an automatic door in response to a passing body being sensed in one sensing area portion after being sensed in another sensing area portion, as indicated by the characteristics of said separate indication signals.
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Accused Products
Abstract
A passive optical switch for an automatic door for opening and closing a door comprises a light receiving portion provided with a segmented light receiving surface formed by a number of the optical fiber fluxes so as to be adjusted to the focus of a lens, a phototube cell converter portion connected to each of the optical fiber fluxes extending from said light receiving portion, a voltage change detecting portion for detecting the change of an output of said phototube cell converter portion and a direction discriminator circuit for analyzing a detecting signal emitted from said voltage change detecting portion, whereby an automatic opening and closing of a door may be effected by discriminating onward movement of a passing body by detecting the change of an output emitted from said phototube cell converter portion caused by a passing body.
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Citations
8 Claims
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1. A passive optical switch for an automatic door for automatically opening and closing a door, by sensing the direction of movement of passing bodies within a sensing area, comprising:
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light receiving means having at least two groups of optical fiber cables, each group having first and second ends, the first ends forming light receiving surfaces, wherein each surface is positioned to receive light from a different portion of a sensing area; phototube cell converter means, conncected to the second ends of the optical fiber cables, for producing a separate indication signal, for each light receiving surface, which has a characteristic indicative of the intensity of light received by that light receiving surface; and direction discriminator circuit means for receiving said separate indication signals and for producing a control signal for driving an automatic door in response to a passing body being sensed in one sensing area portion after being sensed in another sensing area portion, as indicated by the characteristics of said separate indication signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification