Object sensor system for automatic swing door
First Claim
1. An object sensor system for a swing door for automatically opening and closing a doorway, said system including a sensor comprising a light-emitter and a light-receiver which are mounted on said swing door, said light-emitter emitting light toward a floor and said light-receiver receiving said light as reflected from the floor, whereby a generally pyramidal sensing zone containing said floor is formed;
- wherein the shape of said sensing zone on the floor is generally rectangular, with the width of the rectangle being equal to or larger than the width of the swing door;
said generally pyramidal sensing zone includes a main sensing area located closer to said swing door, and an auxiliary sensing area adjacent to said main sensing area and remote from said swing door; and
said auxiliary sensing area is disabled when said swing door moves.
1 Assignment
0 Petitions
Accused Products
Abstract
A object sensor system for a swing door includes swing-side and approach-side sensors. Each of the sensors includes light-emitters and light-receivers which are mounted on a swing door. The light-emitters emit light toward a floor, and the light-receivers receive the light as reflected from the floor. The light emitted and received provides an object sensing zone which has a rectangular shape on the floor having a width equal to or larger than the width of the door. The sensing zone includes a main sensing area closer to the door and an auxiliary sensing area extending along the main sensing area. The auxiliary sensing area is disabled when the door moves.
136 Citations
33 Claims
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1. An object sensor system for a swing door for automatically opening and closing a doorway, said system including a sensor comprising a light-emitter and a light-receiver which are mounted on said swing door, said light-emitter emitting light toward a floor and said light-receiver receiving said light as reflected from the floor, whereby a generally pyramidal sensing zone containing said floor is formed;
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wherein the shape of said sensing zone on the floor is generally rectangular, with the width of the rectangle being equal to or larger than the width of the swing door; said generally pyramidal sensing zone includes a main sensing area located closer to said swing door, and an auxiliary sensing area adjacent to said main sensing area and remote from said swing door; and said auxiliary sensing area is disabled when said swing door moves. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An object sensor system for a swing door for automatically opening and closing a doorway, said system including a sensor comprising a light-emitter and a light-receiver which are mounted on said swing door, said light-emitter emitting light toward a floor and said light-receiver receiving said light as reflected from the floor, whereby a sensing zone containing said floor and moving with said swing door is formed;
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wherein said light-receiver develops a light-receiver output having a value corresponding to the amount of light received by said light-receiver at each of door positions which said door passes when said door swings between fully opened and fully closed positions of said door; a reference value is set for said sensing zone at each of said door positions, the reference value for sensing zone at each of said door positions is formed from the light-receiver output developed when no object is present in said sensing zone; and a light-receiver output developed by said light-receiver at each of said door positions during a normal operation of the swing door is compared with the corresponding reference value. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. An object sensor system for a swing door for automatically opening and closing a doorway, said system including a sensor comprising a light-emitter and a light-receiver which are mounted on said swing door, said light-emitter emitting light toward a floor and said light-receiver receiving said light as reflected from the floor, whereby a sensing zone containing said floor is formed;
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wherein said light-receiver develops a light-receiver output having a value corresponding to the amount of light received by said light-receiver at each of door positions which said door passes when said door swings between fully opened and fully closed positions of said door; a reference value is set for said sensing zone at each of said door positions, the reference value for said sensing zone is formed from the light-receiver output developed when no object is present in that sensing zone; and at least one limit value is set with respect to the reference value for the sensing zone at each of said door positions for defining a boundary of a dead zone, said dead zone being such that when the light-receiver output falls in said dead zone, it is judged that there is no object present in said sensing zone at that door position. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27)
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28. An object sensor system for a swing door for automatically opening and closing a doorway, said system including a sensor comprising a light-emitter and a light-receiver which are mounted on said swing door, said light-emitter emitting light toward a floor and said light-receiver receiving said light as reflected from the floor, whereby a sensing zone containing said floor is formed, said sensor further including a controller for controlling said light-emitter and said light-receiver, said controller converting the amount of light received by said light-receiver into a light-receiver output having a value within a predetermined response range;
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wherein a reference value is set for said sensing zone at each of said door positions, the reference value for said sensing zone is formed from the light-receiver output developed when no object is present in that sensing zone; at least one limit value is set with respect to the reference value for the sensing zone at each of said door positions for defining a boundary of a dead zone, said dead zone being such that when the light-receiver output falls in said dead zone, it is judged that there is no object present in said sensing zone at that door position; and when said at least one limit value is outside said response range, said controller causes said limit value to be located in said response range. - View Dependent Claims (29)
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30. An object sensor system for a swing door for automatically opening and closing a doorway, said system including a sensor including a light-emitter and a light-receiver mounted together at a location in the upper portion of the swing door, said light-emitter emitting light toward a floor and said light-receiver receiving said light as reflected from the floor, whereby a sensing zone containing said floor is formed;
wherein a path along which light emitted from said light-emitter to the floor follows or a path along which light reflected from the floor to said light-receiver follows is shorter on a distal edge side of the door than on a rotation axis side of the door where an axis of rotation of the door is located. - View Dependent Claims (31)
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32. An object sensor system for a swing door for automatically opening and closing a doorway, said system including a sensor including a light-emitter and a light-receiver mounted together at a location in the upper portion of the swing door, said light-emitter emitting light toward a floor and said light-receiver receiving said light as reflected from the floor, whereby a sensing zone containing said floor is formed;
wherein a path along which light emitted from said light-emitter to the floor or a path along which light reflected from the floor to said light-receiver on a distal edge side of the door follows crosses the distal edge of the door at an approximately half height of the door. - View Dependent Claims (33)
Specification