Object sensor system for doors
First Claim
Patent Images
1. A door sensor system comprising:
- light-emitting means for generating light to be projected toward a floor near a door;
focusing means for focusing a component of light generated by said light-emitting means which impinges directly thereon and directing the focused light component directly toward a first region at a location along said door;
variably tiltable reflecting means for reflecting, toward said focusing means, a component of said light which does not directly impinge on said focusing means, and directing said reflected light component toward a second region at a location more remote from said door than said first region; and
light-receiving means adapted to receive light reflected from said first and second regions.
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Abstract
A light-emitter emits light, and a plano-convex condenser lens focuses the emitted light and projects the focused light onto a floor near a door to thereby establish a sensing area. A plano-convex light-receiving lens focuses light reflected from the sensing area, and a light-receiver receives the focused, reflected light. The plano-convex lenses have edges closer to the door which is substantially straight.
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Citations
17 Claims
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1. A door sensor system comprising:
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light-emitting means for generating light to be projected toward a floor near a door; focusing means for focusing a component of light generated by said light-emitting means which impinges directly thereon and directing the focused light component directly toward a first region at a location along said door; variably tiltable reflecting means for reflecting, toward said focusing means, a component of said light which does not directly impinge on said focusing means, and directing said reflected light component toward a second region at a location more remote from said door than said first region; and light-receiving means adapted to receive light reflected from said first and second regions. - View Dependent Claims (2, 3, 4, 5)
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6. A door sensor system comprising:
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light-emitting means for generating light to be projected toward a floor near a door; light-receiving means adapted to receive light reflected from said floor; focusing means for focusing a light component reflected from a first region on said floor at a location along said door and causing the focused light component to impinge directly on said light-receiving means; and variably tiltable reflecting means for reflecting a light component reflected from a second region at a location more remote from said floor than said first region and focused by said focusing means, to thereby cause the reflected and focused light component to impinge on said light-receiving means. - View Dependent Claims (7, 8, 9, 10)
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11. A door sensor system comprising:
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light-emitting means for generating light to be projected toward a floor near a door; first focusing means for focusing a component of light generated by said light-emitting means which impinges directly thereon and directing the focused light component directly toward a first region at a location along said door; first variably tiltable reflecting means for reflecting, toward said first focusing means, a component of said light which does not directly impinge on said first focusing means, and directing said reflected light component toward a second region at a location more remote from said door than said first region; light-receiving means adapted to receive light reflected from said first and second regions; second focusing means for focusing a light component reflected from said first region and causing the focused light component to impinge directly on said light-receiving means; and second variably tiltable reflecting means for reflecting a light component reflected from said second region and focused by said second focusing means, to thereby cause the reflected and focused light component to impinge on said light-receiving means. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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Specification