Abstract: Cameras 31, 32 take images of an image space around a door. A distance calculation unit 33 calculates the distance to an object in the taken images. A coordinate transformation unit 34 detects the three-dimensional position of the object in the image space. The image space covered by the cameras 31, 32 is divided into a plurality of voxels. Some of these voxels are optionally set as constituents of the detection area. A judgement unit 36 judges whether the detected three-dimensional position of the object locates within or outside the detection area. If the object is present within the detection area, an output unit 37 produces an object detection signal, so that the door is allowed to open.

Abstract: A differential infrared detector has: a detection element which detects infrared radiation in a predetermined detection area, converts a radiation energy thereof into an electric signal, and outputs the signal; and a discrimination circuit which calculates a variation amount of the radiation energy, based on the output signal, and generates a human body detection signal if the variation amount is equal to or greater than a predetermined level. This differential infrared detector comprises: an ambient temperature detection circuit which generates a voltage, based on an ambient temperature in the detection area; and a sensitivity correction circuit which is arranged to increase detection sensitivity of the output signal produced by the detection element if the ambient temperature is within the predetermined temperature range, based on the voltage.

Abstract: Auxiliary sensors 51 and 52 are disposed on exterior and interior side surfaces 31 and 32 of a transom 3. The sensors 51 and 52 have detection areas A1, A2, B1 and B2 which extend through the doorway 2 and which cross each other in a space vertically above a track 10. While detection signals are produced by both auxiliary sensors 51 and 52, the door is kept open. If detection signals are produced from only one of the auxiliary sensors 51 and 52 uninterruptedly for a predetermined time, the door closing action is allowed to start.

Abstract: Cameras take images of a predetermined area around a door. A distance measurement unit measures a distance from the cameras to each object in the taken images. Based on the measured distance, a floor detection unit detects a floor, and an object height/position detection unit detects a height and position of any object other than the floor. A door position detection unit and a door position identification unit 57 specify position of the door (i.e. open or closed) in the images taken by the cameras. A judgement unit judges presence or absence of an object which is neither the floor nor the door. If an object other than the floor and the door is observed in the images taken by the cameras, an output unit produces an object detection signal, so that the door is kept in an open state.

Abstract: In an auxiliary safety sensor 6 which has a first sensor set composed of a first transmitter 61 and a first receiver 63 located opposite to each other and a second sensor set composed of a second transmitter 62 and a second receiver 64 located opposite to each other, a test operation is performed by emitting a light beam only from the first transmitter 61. The state of misconnection is confirmed when a connection point 73 for the first receiver 61 does not receive predetermined light acceptance data for the amount of received light. To solve the misconnection, the light acceptance data based on the signals from the receivers 63, 64 are exchanged between each other, before they are supplied to the data acquisition means 8.

Abstract: An optical axis adjuster 7 is provided to change the optical axis direction of a transmitter unit having a transmitter element 65. A restriction member 9 is latched in an external thread 71 which is formed in the outer circumferential surface of the adjuster 7. The adjuster 7 is held by a rotation/revolution support member 74 and rotatable around its central axis O. The rotation/revolution support member 74 is rotatable around a rotation axis 8 extending perpendicularly to the central axis O. Stepped adjustment of the optical axis is effected by revolving the adjuster 7 around the revolution axis 8 such that the restriction member 9 climbs over a thread ridge. Stepless adjustment of the optical axis is conducted by moving the adjuster 7 in cooperation with its rotation around the central axis O, with the restriction member 9 keeping a latched engagement with a thread groove.

Abstract: To provide an anti-thief security sensor assembly wherein an optical axis adjustment of a beam projector can be accurately achieved merely by physically opening a cover of a beam projecting unit while a cover of a beam receiving unit is not opened physically, the anti-thief security sensor assembly includes a beam projecting unit (1) for emitting an infrared beam IR and having a projector cover (21A) mounted on a projector base (20A) so as to cover and protect a sensor circuit. This beam projecting unit (1) includes an opening detecting switch (7) for detecting the physical opening of the projector cover (21A) and a transmission request generating circuit (8) operable in response to the detection by the opening detecting switch (7) to output a received beam level transmission request signal B to the beam receiving unit (2).

Abstract: A security sensor 1 having a disturbance detecting capability capable of detecting the presence of an obstacle purposefully applied to the sensor 1 in an attempt to fool or tamper the sensor 1 includes a carrier body A having an infrared sensor element 4, an incident side enclosure 5 mounted on the carrier body A, a light projecting element 11 for projecting a disturbance detecting beam L1, a light receiving element 12 for receiving disturbance detecting beam L1, first and second light guide members 8, 9 operatively associated with the light projecting element 11 and the light receiving element 12, respectively, said first and second light guide members 8, 9 being cooperative with each other to define an optical path L along and adjacent an outer surface of the incident side enclosure 5 or an outer surface of the carrier body A adjacent the incident side enclosure 5, a detecting circuit 15 for detecting a presence or absence of an obstacle, applied to at least one of the first and second light guide members 8

Abstract: A security sensor 1 having a disturbance detecting capability capable of detecting the presence of an obstacle 8 purposefully applied to the sensor 1 in an attempt to fool or tamper the sensor 1 includes a carrier body A having an infrared sensor element 4, an incident side enclosure 5, such as a lens defining a detection area B, mounted on the carrier body A, a light projecting element 11 for projecting a disturbance detecting beam L1 from inside of the incident side enclosure 5 towards the incident side enclosure 5, a light receiving element 12 for receiving the disturbance detecting beam L1 reflected from the incident side enclosure 5, and a detecting circuit 15 for detecting a presence or absence of the obstacle 8 on the incident side enclosure 5, based on an amount of light received by the light receiving element 12.

Abstract: A passive-type infrared detector 1 includes an infrared sensor 3, a pair of lens elements (optical elements) 4R and 4L, a pair of mirrors 5R and 5L and a casing 2. The lens elements 4R and 4L are used to define detection areas a+ and a− opposed substantially 180° to each other for the infrared sensor 3. The mirrors 5R and 5L are used to direct infrared rays of light from the detection areas towards the infrared sensor 3. When this passive-type infrared detector 1 is installed at a position intermediate of an alert region, a combination of the infrared sensor 3, one of the lens elements 4R and one of the mirrors 5R is effective to monitor a range from one end of the alert region to the intermediate position whereas a combination of the infrared sensor 3, the other of the lens elements 4L and the other of the mirrors 5L is effective to monitor a range from the opposite end of the alert region to the intermediate position. Therefore, one half of the alert region may be a detection distance.

Abstract: A retroreflective detector comprises a detection unit which houses two transmitting elements and two receiving elements, in which a transmitting element and a receiving element form a pair and two such pairs are disposed in a matrix arrangement. Every row and column of the matrix includes one or more transmitting elements.

Abstract: A intruder detecting apparatus for detecting a intruder invading an detection area defined in, for example, a window, entrance or apron region in front of one or more wall-mounted paintings includes a first sensor 2X having an detection area 7A defined in the front side of the objects 5 and 6 to be watched and the region upwardly of those objects 5 and 6 to be watched, and a second sensor 2Y having an detection area 7B defined in the front side of the objects 5 and 6 to be watched and the region downwardly of those objects 5 and 6 to be watched. A timer-equipped logic circuit 13 is provided in at least one of the first and second sensors 2X and 2Y. The other of the first and second sensors 2X and 2Y has an output path 17 provided therein for outputting a detection signal a from a detector 10 within such sensor to an external circuit.

Abstract: A stereoscopic antenna includes a planar electroconductive pattern 2 adapted to be grounded, a loop-shaped antenna body 3 having an axis C0 lying perpendicular to the planar electroconductive pattern 2, and an antenna connection 4 for connecting the antenna body 3 to the planar electroconductive pattern 2. In this stereoscopic antenna, the ratio H/D of the longer diameter D of the antenna body 3 relative to the height H of the antenna body 3 as measured from the planar electroconductive pattern 2 is chosen to be within the range of 0.1 to 1. By making the antenna to have a three-dimensional structure different from any of the loop antenna and the rod antenna, the stereoscopic antenna compact in size can be obtained having a uniform field radiation pattern and giving rise to an increased gain.

Abstract: A safety auxiliary apparatus for an automatic door assembly includes a single door or first and second doors slidable along a predetermined track for selectively opening and closing the doorway, first and second mutually confronting closure faces being defined by said first and second doors or said single door in cooperation with a brace. A casing accommodating therein a light emitting element for emitting a beam for detection of an object and a light receiving element for receiving the beam from the light emitting element is mounted in a longitudinal frame member of the doors or said brace that define respectively said closure faces, so that an optical path can be defined between said closure faces so as to extend from the light emitting element to the light receiving element.