JP2000131136A - Heat ray type human body sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To equalize the outputs of sensor elements even if a person is located somewhere in a detecting area by setting an opening angle between the optical axes of each pair of adjacent lens elements at a region of a light-receiving lens to a smaller value than at remaining regions. SOLUTION: Small lens elements 48a-48c are arranged so that the optical axes intersect in one point P near which a heat ray sensor is disposed, e.g. the angles of the straight lines (optical axis) between the optical axis centers A-C of the lens elements 48a-48c and the intersection point P to the straight line passing the center of a light-receiving lens 41 and the intersection point P (center line of the lens 41) are set to 8.37 deg., 18.2 deg., 34.8 deg., respectively, i.e., the opening angle between the optical axes of the elements 48a-48c is smaller at the center of the lens 41 than at the periphery. Thus by installing it above the toilet seat in a toilet, a slight motion of a person setting on the toilet seat can be detected by a heat rays which are received through the lens elements 48a-48c, and the motion of a person entering the toilet can be detected by heat rays received through the lens element 48c.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot-wire type human sensor for detecting presence or absence of a person in a predetermined detection area by detecting a heat ray radiated from a human body.

[0002]

2. Description of the Related Art In such a hot-wire type human sensor, a pyroelectric infrared sensor is often used as a sensor element for detecting a heat ray radiated from a human body. Pyroelectric infrared sensors do not require cooling, are relatively inexpensive, and are differential sensors that generate an output according to the change in heat dose over time. Have. On the other hand, since the pyroelectric infrared sensor is a differential type sensor, it can detect whether a person enters or exits the visual field of the pyroelectric infrared sensor, but obtains an output when a person is in the visual field. It is difficult. In other words, if a person is detected using a differential type sensor element and an attempt is made to operate a load such as an illumination load while the person is present in the detection area, while a person is present within the field of view of the sensor element. Is required to obtain an output from the sensor element.

Therefore, when using this type of sensor element, a light receiving lens is arranged in front of the light receiving surface of the sensor element, and the light receiving lens is used to converge a heat ray for each area in the detection area to the sensor element. It is considered that the lens body is formed as an aggregate of individual lens bodies. Each lens body is generally composed of a Fresnel lens, and a light receiving lens having a large number of optical axes is formed by arranging a large number of Fresnel lenses in parallel. When a light receiving lens having such a structure is used, sensitivity unevenness can be given in the detection area. Therefore, when a person moves in the detection area, the heat dose incident on the sensor element fluctuates, and an output is obtained from the sensor element. Will be. That is, since an output is obtained from the sensor element if a person moves even while a person is present in the detection area, a one-shot multivibrator which is triggered by the output of the sensor element and is retriggerable (retrigable) is provided. If the output is a detection output, the detection output can be continuously generated while a person is present in the detection area.

[0004]

By the way, the conventionally provided light receiving lens is designed so that the opening angles between the optical axes of the respective lens bodies are substantially uniform. In this case, a detection output will be generated for the same degree of human movement in any area within the detection area. on the other hand,
If a hot-wire type human sensor is used to operate a lighting load or a ventilation fan in a toilet, etc., the movement of a person is large when entering the toilet, and the movement of the person is small when sitting on the toilet seat. In each area in the area, the movement of the person may be large or small.

Here, if the light receiving lens is configured to detect a minute movement of a person in any area of the detection area, the number of lens bodies increases and the arrangement density of the lens bodies increases. This leads to an increase in the manufacturing cost of the light receiving lens. Further, the time interval at which an output is obtained from the sensor element is shorter in a region where the motion of the person is large than in a region where the motion of the person is small, and it is difficult to distinguish the noise from noise. vice versa,
When the arrangement density of the lens bodies is reduced, it becomes difficult to detect minute movement of a person.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to determine when a person moves in each area of a detection area and a person exists in which area of the detection area. However, it is an object of the present invention to provide a hot-wire type human sensor in which the outputs obtained from the sensor elements are made substantially equal and the light receiving lens can be formed relatively inexpensively.

[0007]

According to a first aspect of the present invention, there is provided a differential sensor element for detecting a heat ray radiated from a human body and generating an output corresponding to a temporal change of an incident heat dose, and a sensor element. A sensor circuit that determines the presence or absence of a person in the detection area based on the detected heat ray and generates a detection output, a container housing the sensor element and the sensor circuit, and a heat ray for each area in the detection area to the sensor element A light-receiving lens consisting of an aggregate of a number of lens bodies to be converged, and the opening angle between the optical axes of each pair of adjacent lens bodies is set to be smaller in some areas of the light-receiving lens than in the remaining area Is what is being done.

According to a second aspect of the present invention, in the first aspect of the present invention, the light receiving lens is formed in a hemispherical shape surrounding the light receiving surface of the sensor element, and an opening angle between the optical axes of each pair of adjacent lens bodies is made smaller. The area near the center of the light receiving lens in front of the light receiving surface of the sensor element is set to be smaller than the other areas near the periphery of the light receiving lens.

According to a third aspect of the present invention, in the first or second aspect of the present invention, the body has fixing means for fixing the ceiling, and the light receiving lens is exposed on the lower surface of the body.

According to a fourth aspect of the present invention, in the first or second aspect of the present invention, the sensor circuit separately generates two systems of detection outputs.

According to a fifth aspect of the present invention, in the first or second aspect of the present invention, the sensor circuit can separately supply and cut off power to the two-system load using each detection output. In addition, at least one load is provided with time adjusting means for varying the time from when the presence of a person is no longer detected to when the power is turned off.

According to a sixth aspect of the present invention, in the first or second aspect of the present invention, when a person is detected in the detection area, the sensor circuit supplies power to the lighting load and the ventilation fan, respectively. Then, the power supply to the lighting load is cut off after a certain period of time has passed after the power supply to the lighting load is cut off because the presence of a person is no longer detected.

According to a seventh aspect of the present invention, in the first or second aspect of the present invention, the sensor circuit supplies power to a lighting load and a ventilation fan respectively when a person is detected in the detection area, and If a pause signal is received by operating an externally connected switch while power is being supplied to the ventilation fan, the power to the ventilation fan is temporarily shut off, and the presence of a person in the detection area is no longer detected. When the power supply to the fan is cut off, power is supplied to the ventilation fan for a certain period of time.

According to an eighth aspect of the present invention, in the first or second aspect of the present invention, the sensor circuit supplies power to a lighting load when a person is detected in the detection area, and supplies a power to the lighting load in the detection area. When the power supply to the lighting load is cut off because the presence is no longer detected, the power supply is supplied to the ventilation fan for a certain period of time.

According to a ninth aspect of the present invention, in accordance with the sixth to eighth aspects of the present invention, there is provided a brightness sensor for detecting the ambient illuminance, and the sensor circuit is configured to detect the ambient illuminance when the brightness illuminance is equal to or greater than a set value. At some point, the supply of power to the lighting load is prohibited.

According to a tenth aspect of the present invention, in the first to ninth aspects of the present invention, there is provided an automatic mode for supplying / cutting power to a load in response to detection of a heat ray by the sensor element, and detecting the heat ray by the sensor element. And a mode changeover switch capable of selecting a continuous on mode in which power is supplied to the load irrespective of whether the power is supplied to the load or a continuous off mode in which power is not supplied to the load irrespective of the detection of heat rays by the sensor element.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In this embodiment, a case will be described in which a lighting load and a ventilation fan are controlled using a toilet, but it is also possible to use the lighting load and a ventilation fan in another place.
First, the overall configuration will be described. The hot-wire type human sensor according to the present embodiment has a structure suitable for mounting on a ceiling. As shown in FIGS. 2 to 5, a cylindrical shape is provided at the center of the upper surface of a flange portion 11 having a circular outer shape. It has a body consisting of a body 10 having a portion 12 and a cover 20 coupled on the cylindrical portion 12. Four assembly pieces 13 project upward from the upper edge of the cylindrical portion 12 of the body 10.
Each has an assembling hole 14 opened. An assembling claw 21 is projected from a lower side surface of the cover 20, and the assembling claw 21 is engaged with the assembling hole 14 so that the body 10 and the cover 2 are engaged.
0 is combined.

As shown in FIG. 6, the body 10 and the cover 2
Reference numeral 0 denotes circuit boards 31 and 32, each of which is a printed circuit board on which a part of a component of a circuit unit to be described later is mounted.
It is attached to the body 10 and the cover 20 by using. Both circuit boards 31 and 32 are electrically connected to each other using a tape wire 33.

A movable body 40 formed in a ball shape is attached to the body 10. As shown in FIG. 7, the movable body 40 includes a heat ray sensor 1 as a sensor element composed of a pyroelectric infrared sensor. And a circuit board 34 composed of a printed board on which the brightness sensor 2 composed of CdS is mounted. Also, the circuit board 34 is mounted with the indicator lamp 3 using the light emitting diode and some components constituting the circuit section. On the front side of the light receiving surface of the heat ray sensor 1 in the movable body 40, a light receiving lens 41 formed in a hemispherical shape is provided, and a heat ray enters the heat ray sensor 1 through the light receiving lens 41. The light receiving lens 41 is made of a high-density polyethylene resin so that infrared rays can be easily transmitted. The light receiving lens 41 is formed in a milky white color so that infrared rays can be transmitted, the surrounding illuminance can be detected by the brightness sensor 2, and the lighting of the indicator lamp 3 can be visually recognized from the outside.

The flange portion 11 of the body 10 includes
As shown in FIG. 4, two mounting holes 15 are formed for inserting a box screw to be screwed into an embedding box arranged in the ceiling and a tapping screw used for directly attaching a body to the ceiling. You. The two mounting holes 15 are provided on opposite sides of the center of the flange portion 11 and are formed in a long hole shape having a long axis orthogonal to the direction connecting the two mounting holes 15. A straight line perpendicular to a straight line passing through both mounting holes 15 and a straight line passing through the center of the flange portion 11 is provided with a tightening screw 5 provided on two mounting tools 50 used for fixing to a ceiling panel.
Two operation holes 16 each of which exposes 1 are formed. The operation hole 16 is formed in a so-called daruma hole shape in which the center side of the flange portion 11 is narrow and the peripheral side is wide.

As shown in FIGS. 2, 3 and 5, the mounting member 50 has a supporting column 52 whose lower end fits into a mounting groove 17 provided on the upper surface of the flange portion 11, and an upper end inserted through the supporting column 52. It has a tightening screw 51 whose part is held at the upper end of a support post 52, and a sandwiching piece 53 screwed to the tightening screw 51. Prop 52
The outer surface of the outer peripheral side of the flange portion 11 is open, and a notch portion 54 for retracting the sandwiching piece 53 is formed on the upper end side wall of the support column 52. The notch 54 is formed at the upper end of the side wall on the left side when viewed from the opening surface of the column 52.
When the tightening screw 51 is rotated clockwise in a state where the clip 53 is retracted in the notch 54, the tightening screw 5
With the rotation of 1, the pinch piece 53 comes out of the notch portion 54 and protrudes outward from the column 52, and moves downward while being prevented from rotating by the side wall of the column 52. That is, when the tightening screw 51 is tightened, the clip 53
Moves in a direction to reduce the distance from the flange portion 11. Conversely, when the tightening screw 51 is rotated counterclockwise, the clip 53 moves upward and is retracted in the notch 54.

The fixture 50 is detachable from the flange portion 11. When attaching the body to the ceiling panel, the fixture 50 is fixed to the flange portion 11, and the cylindrical portion 12 is inserted into a through hole formed in the ceiling panel. Then, the tightening screw 51 may be rotated with the fixture 50 inserted. By such an operation, the ceiling panel around the through hole is sandwiched between the flange portion 11 and the sandwiching piece 53, so that the body can be fixed to the ceiling panel. Since the through hole is desirably circular so that it can be formed using a forsaw or the like, the cylindrical portion 12 is formed such that the outer periphery of the region including the cylindrical portion 12 and the mounting fixture 50 is substantially within the circle. Has an elliptical shape in which both sides of the circle are cut off, and the mounting member 50 is arranged at the cut-off portion.

The movable body 40 is formed in a ball shape as described above, and as shown in FIG. 7, a ring-shaped lower frame 43 connected to the lower edge of the upper frame 42, and is held by the lower frame 43. A semi-spherical light receiving lens 41. The outer peripheral surfaces of the upper frame 42 and the lower frame 43 are curved so as to form a part of a spherical surface, and a pair of shaft pins 44 project from the outer peripheral surface of the upper frame 42. The movable body 40 makes the outer peripheral surface of the lower frame 43 contact the opening edge of the opening window 18 formed at the center of the flange portion 11,
The light receiving lens 41 is attached to the body 10 so as to expose the light receiving lens 41 from the opening window 18. A groove 19 is formed in the periphery of the opening window 18 as shown in FIG. 6, and the movement direction of the movable body 40 is regulated by inserting the shaft pin 44 into the groove 19. That is, rotation by the shaft pin 44 moving up and down along the groove 19 and rotation around the shaft pin 44 are possible. Therefore, the direction of the movable body 40 with respect to the body 10 can be changed.

Here, in order to prevent the movable body 40 from rising, a pressing plate 45 is fixed to the body 10, and a pressing pin 46 provided at the center of the pressing plate 45 is attached to the movable body 4.
Abuts on top of 0. The holding pin 46 is urged in a direction in which it comes into contact with the movable body 40. Further, in order to regulate the rotation range of the movable body 40, an annular position regulating rib 47 is protruded from the upper surface of the upper frame 42, and the holding pin 46 is moved within the range surrounded by the position regulating rib 47. So that it abuts.

A decorative plate 30 that covers the lower surface of the flange 11 is attached so that the lower surface of the flange 11 is not exposed when the body is mounted on the ceiling. A window hole (not shown) is formed in the center of the decorative plate 30 at a position corresponding to the opening window 18 provided in the body 10.
Therefore, with the decorative plate 30 attached to the body 10, the light receiving lens 41 passes through the window hole and the decorative plate 3.
0 is exposed on the lower surface side. Note that the decorative plate 30 is formed so as to engage with the flange portion 11 unevenly.

By the way, terminals for connecting external electric wires are mounted on the circuit board 32 housed in the cover 20. In this embodiment, one system power supply and two systems load can be connected, and three terminals are provided. These terminals are so-called quick connection terminals, and as shown in FIG.
A terminal plate 36 mounted on the circuit board 32; a locking spring 37 for holding an external electric wire between the terminal plate 36;
And a release button 38 which is operated when the external power supply held by 7 is disconnected. The locking spring 37 is formed by bending a metal plate having elasticity. The locking spring 37 holds an external electric wire between the terminal plate 36 by a spring force and cuts an edge of the external electric wire into the external electric wire. Secure the wires. The release button 38 is provided to separate the locking spring 37 that holds the external electric wire from the external electric wire. That is, the locking spring 38 can be bent by pressing the release button 38. Also, one release button 38 can simultaneously deflect the two locking springs 38.

The external electric wire is inserted into the body through an electric wire insertion port 23 (see FIG. 5) formed on the upper surface of the cover 20.
It is sandwiched between the terminal plate 36 and the locking spring 37. Also,
The release button 38 is connected to the operation hole 2 provided adjacent to the wire insertion port 23.
4 can be operated by inserting the tip of a driver or the like. A terminal cover 25 shown in FIG. 8 is detachably mounted on the cover 20 so that the electric wire insertion port 23 and the operation hole 24 can be covered as necessary. As described above, in order to attach the body to the ceiling, in addition to using the embedding box, there are cases where it is directly mounted or the mounting tool 50 is used. Mouth 23 and operation hole 24
Terminal cover 2 to prevent dust and water droplets from entering
5 is attached.

As shown in FIG. 9, the light receiving lens 41, which is a feature of the present invention, includes a lens portion 41a, which is an aggregate of a large number of lens bodies 48a to 48c each composed of a Fresnel lens, and a lower frame 43. And a retaining frame 41b disposed along the inner peripheral surface of the lower frame 43. A locking projection 41c that engages with the inner peripheral surface of the lower frame 43 is provided on the upper peripheral surface of the retaining frame 41b, and The upper frame 4 is provided above the holding frame portion 41b.
Positioning projections 41d that engage with the inner peripheral surface of the projection 2 are protruded. As shown in FIG. 1, the lens bodies 48a to 48c are arranged in a triple circle, with four lens bodies 48a in the innermost circle and eight lens bodies in the next largest circle. In the body 48b, the outermost circle, twelve lens bodies 48c are formed. Lens body 48a in each circle
To 48c are formed in the same shape, so that the optical axis of each of the lens bodies 48a to 48c and the lens body 4
Intersection with 8a to 48c (hereinafter referred to as optical axis center) A to
C are arranged at equal pitches in the circumferential direction. That is,
The optical axis center A of the lens body 48a is spaced at 45 °, the optical axis center B of the lens body 48b is spaced at 22.5 °, the lens body 4
The optical axis center C of 8c is at an interval of 15 °.

The lens bodies 48a to 48c are arranged so that their optical axes intersect at one point, and the heat ray sensor 1 is arranged near the intersection P. With respect to a straight line connecting the center of the light receiving lens 41 and the intersection point P (that is, the center line of the light receiving lens 41), a straight line connecting the optical axis centers A to C of the lens bodies 48a to 48c and the intersection point P (that is, Lens body 48a-4
As shown in FIGS. 1B to 1D, angles formed by the optical axis 8c and the optical axis 8c are 8.37 °, 18.2 °, and 34.8, respectively.
° is set. That is, the opening angle between the optical axes of the lens bodies 48a to 48c is smaller on the center side of the light receiving lens 41 than on the peripheral side. In addition, the lens body 4
The outer diameter of each of the circles 8a to 48c is 6.5.
5 mm, 13.46 mm, and 20 mm are set, and the thickness of each of the lens bodies 48 a to 48 c is 0.8 mm,
1.1 mm and 1.1 mm are set.

FIG. 10 schematically shows a detection area formed by using the light receiving lens 41 configured as described above. FIG. 10A shows each lens body 48.
The ranges near the maximum sensitivity for a to 48c are shown as beam-shaped ranges Ba to Bc. FIG.
(B) shows the distribution near the maximum sensitivity of each of the lens bodies 48a to 48c 2 m below the mounting surface of the hot-wire type human sensor. Here, a four-element type (that is, a configuration in which four sensor elements of a pyroelectric infrared sensor are arranged at the apexes of a square in one can) is used as the heat ray sensor 1. Therefore, in FIG. 10B, a region where the sensitivity is almost maximum in a region corresponding to each of the lens bodies 48 a to 48 c in the detection region is represented by four squares. As is clear from the figure, in the vicinity immediately below the hot-wire type human sensor, the interval between the parts near the maximum sensitivity of each of the lens bodies 48a to 48c is narrower than the peripheral part.

Therefore, if a hot-wire type human sensor is disposed above the toilet seat in the toilet, it is possible to detect a minute movement of a person sitting on the toilet seat by the heat rays received through the lens bodies 48a and 48b. The movement of a person entering and exiting the toilet can be detected by the heat rays received through the lens body 48c. In other words, it is possible to change the magnitude of the movement of the person necessary for the heat ray sensor 1 to generate an output in each area within the detection area. For example, a velocity of about 0.2 to 0.5 m / s near the toilet seat Detects a person just by moving in the area.
If the user does not move at a speed of about m / s, no person can be detected. Note that the configuration of the light receiving lens 41 is not limited to that shown in FIG. 1, and the arrangement of the lens bodies can be set as appropriate.

By the way, the above-mentioned hot-wire type human sensor is
Since it is assumed to be used in a toilet, the system is configured so that the loads of two systems of a lighting load and a ventilation fan can be controlled separately. Hereinafter, the configuration of the circuit unit will be described. FIG. 11 is a block diagram, and FIG. 12 is a circuit diagram showing a specific configuration. As shown in FIG. 11, the heat ray sensor 1 and the brightness sensor 2 are connected to a signal processing unit 4 which is a sensor circuit. The signal processing unit 4 gives instructions to the illumination control unit 5 and the ventilation fan control unit 6 based on the outputs of the heat ray sensor 1 and the brightness sensor 2 to control the illumination load (incandescent lamp) L and the ventilation fan F. Here, the internal power supply is a commercial power supply AC
Is stabilized by the stabilizing power supply unit 7.
Also, an indicator light 3 composed of a light emitting diode that lights up when a heat ray radiated from a person is detected by the heat ray sensor 1.
Is also connected to the signal processing unit 4, and in the example shown in the figure, there is also provided an illumination timer time setting unit 8 for setting a time from when a person is no longer detected by the heat ray sensor 1 until the illumination load L is turned off. .

As shown in FIG. 12, a power supply terminal T1 for connecting a commercial power supply AC, a lighting terminal T2 for connecting a lighting load L, and a ventilation fan terminal T for connecting a ventilation fan F.
3 and a triac Q1 between the terminals of the lighting terminal T2.
Is connected, and the contact r1 of the relay Ry is inserted between the terminals of the ventilation fan terminal T3. Power supply terminal T1, lighting terminal T2,
The ventilation fan terminals T3 are each configured by the quick connection terminal described above. The triac Q1 and the contact r1 are inserted between one of the power terminals T1 and one of the lighting terminal T2 or one of the ventilation fan terminals T3. The lighting load L is turned on / off by turning on / off the triac Q1, and the ventilation fan F is turned on / off by the contact r1. It is turned on and off. Triac Q
1 and the relay Ry are controlled by a signal processing unit 4 composed of a microcomputer.

The power of the signal processing section 4 is supplied from a stabilized power supply section 7 which rectifies and smoothes and stabilizes a commercial power supply AC connected to a power supply terminal T1. The brightness sensor 2 can switch the resistance value between the power supply and the power supply in three stages by a sensitivity adjustment switch SW1. The brightness sensor 2 operates in a state independent of the detection of the ambient illuminance by the brightness sensor 2 and adjusts the sensitivity. The state to be set to either high or low can be selected. As the illumination timer time setting unit 8, a variable resistor VR1 is connected to the signal processing unit 4, and the time can be adjusted from about 15 seconds to about 6 minutes.

Further, the circuit section in the illustrated example has an automatic mode in which the lighting load L and the ventilation fan F are turned on / off in response to the detection of a person by the heat ray sensor 1, and the lighting load L is turned off regardless of whether a person is detected. Three modes can be selected: a continuous off mode in which the lighting load L and the ventilation fan F are turned on regardless of whether a person is detected or not, and the mode is switched by the mode switch SW2. It is.

As is apparent from the above description, three operation units of the sensitivity adjustment switch SW1, the mode changeover switch SW2, and the variable resistor VR1 are provided, and these operation units are provided with flanges as shown in FIG. The lower surface of the portion 11 is exposed. In addition, since no adjustment is required at all times, the operation unit is covered with the decorative plate 30 attached.

Next, the operation will be described. The basic operation in the present embodiment is as shown in FIG. 13. In FIG. 13, the case where the state of detecting the ambient illuminance is selected by the sensitivity adjustment switch SW1 and the automatic mode is selected by the mode change switch SW2. Is shown. When the ambient illuminance is equal to or less than the illuminance set by the sensitivity adjustment switch SW1 as shown in FIG. 13A and the surroundings are darkened, as shown in FIG. The lighting load L is turned on / off in response to the detection of a person (time t1, t2 is the time of detection of a person), and when the surroundings are bright, the lighting load L is kept off regardless of the presence or absence of a person. Further, the ventilation fan F is turned on and off according to the presence or absence of a person regardless of the surrounding illuminance as shown in FIG. Here, when the lighting load L is turned on, a soft start is performed,
As the time elapses, the light output of the illumination load L increases, and enters a rated lighting state after a certain time (for example, 2.5 seconds). Here, a triac Q1 is used between the terminals of the lighting terminal T2, and soft start is realized by controlling the phase of the triac Q1. Also, Triac Q
Since the phase control by 1 is performed, the lighting load L uses an incandescent lamp. Inrush current is generated when the incandescent lamp is turned on instantaneously, but the inrush current can be suppressed by performing soft start.

When the end of the operation holding time (for example, 15 seconds) set by the variable resistor VR1 is approached after a person is detected, the light output of the lighting load L is reduced a predetermined time (for example, 6 seconds). A notice is given by having the user make a notice. As a result, it is possible to know that the light is approaching. When the heat ray sensor 1 detects the movement of a person during the operation holding time X1, the operation holding time X1 is extended,
The lighting load L is turned off after the operation holding time X1 has elapsed since the last time a person is no longer detected. When a person is detected by the heat ray sensor 1 during the notice dimming, the state is shifted to the rated lighting state again. In this way, the lighting load L continues to be lit while a person is detected, so that a minute movement of a person can be detected in the vicinity of the toilet seat as described above, thereby sitting on the toilet seat. It is possible to prevent the lighting load L from being turned off halfway even by a minute movement of a person.

On the other hand, the ventilation fan F starts operating when a person is detected, and starts operating when the operation holding time X1 ends.
Further, when a predetermined time (for example, 5 minutes) X2 elapses, the operation is stopped. Here, the time X2 from the end of the operation holding time X1 to the stop of the ventilation fan F is fixedly set. As described above, since the loads of the two systems of the lighting load L and the ventilation fan F can be individually controlled, the system is suitable for use in a toilet or the like.

In the above-described example, the case where the operation is changed in accordance with the detection of the ambient illuminance by the brightness sensor 2 has been described. Sometimes, it is necessary to light the illumination load L. In this case, the sensitivity adjustment switch SW1
The brightness sensor 2 may be set to invalid.

In the above-described embodiment, the power supply to the lighting load L is controlled by the triac Q1. However, the lighting load L may be an inverter-type lighting fixture having a dimming function on the fixture side. For example, a relay contact may be used instead of the triac Q1. in this case,
An instrument having a configuration in which the light output of the illumination load L changes when the relay contact is turned on within a predetermined time after being turned off. Further, if the apparatus changes the light control amount by a voltage signal, a voltage signal for instructing the light control amount may be output from the illumination terminal T2. Alternatively, both the lighting load L and the ventilation fan F may be turned on and off by a triac.

Although the time until the ventilation fan F is stopped after the end of the operation holding time is fixedly set, this time may be adjustable by a variable resistor or a switch. The setting may be fixed. Furthermore, although the configuration example in which the lighting load L and the ventilation fan F are turned on at the same time has been described, the ventilation fan F may operate only for the contact time after the lighting load L is turned off. Alternatively, a switch such as a push button switch is separately provided, and the lighting load L and the ventilation fan F are simultaneously turned on.
When this switch is operated in the toilet, the ventilation fan F may be temporarily stopped, and the ventilation fan F may operate again for a set time when the lighting load L is turned off. By providing such a switch, the user can temporarily stop the ventilation fan when the ventilation fan is operating, such as in winter, when the user feels cold, which increases convenience.

Further, in the above-described example, the mode switch SW2 for switching the lighting load L between the automatic mode, the continuous off mode, and the continuous on mode is provided, but one mode is provided for both the lighting load L and the ventilation fan F. Mode switch S
The mode may be switched by W2, or a mode switch may be provided separately for the lighting load L and the ventilation fan F. Further, a mode changeover switch may be separately provided.

[0044]

According to the first aspect of the present invention, there is provided a differential sensor element for detecting a heat ray radiated from a human body and generating an output in accordance with a temporal change of an incident heat dose, and a heat sensor for detecting a heat ray detected by the sensor element. A sensor circuit for determining the presence or absence of a person in the detection area and generating a detection output, a sensor element and a container housing the sensor circuit, and a number of elements for converging a heat ray for each area in the detection area to the sensor element A light receiving lens composed of an aggregate of lens bodies, wherein the opening angle between the optical axes of each pair of adjacent lens bodies is set smaller in a partial area of the light receiving lens than in the remaining area. In a region where the opening angle between the optical axes of the lens bodies is small, even if the person moves slightly, the heat dose incident on the sensor element changes and the presence of the person can be detected. In addition, since the heat dose changes when the person moves relatively large in other parts, the change in the heat dose can be made the same even if the size of the motion of the person is different. As a result, the output from the sensor element and the noise can be easily distinguished from each other, and the number of lens bodies does not increase more than necessary, and the lens bodies can be provided at a relatively low cost.

According to a second aspect of the present invention, in the first aspect of the present invention, the light receiving lens is formed in a hemispherical shape surrounding the light receiving surface of the sensor element, and the opening angle between the optical axes of each pair of adjacent lens bodies is The area near the center of the light-receiving lens, which is in front of the light-receiving surface of the sensor element, is set to be smaller than the other area near the periphery of the light-receiving lens. By providing the light receiving lens of this configuration and disposing it above the toilet seat, it is possible to detect relatively large movement of a person entering and exiting the toilet and to detect minute movements of a person sitting on the toilet seat. Therefore, there is an advantage that it is possible to prevent the lighting load from being inadvertently turned off during use of the toilet.

According to a third aspect of the present invention, in the first or second aspect of the present invention, the body is provided with fixing means for fixing the ceiling, and the light receiving lens is exposed on the lower surface of the body, and is mounted on the ceiling. Thus, a relatively large detection area can be set. In particular, when used in a toilet, arranging it on the ceiling immediately above the toilet seat makes it easy to distinguish the peripheral area of the toilet seat from other areas.

According to a fourth aspect of the present invention, in the first or second aspect of the present invention, the sensor circuit separately generates two detection outputs, and controls, for example, a lighting load and a ventilation fan separately. be able to.

According to a fifth aspect of the present invention, in the first or the second aspect of the present invention, the sensor circuit can separately supply and cut off power to the two-system load using each detection output. At least one time adjusting means for varying the time from when the presence of a person is no longer detected until the power is turned off;
This is provided for the load of the system, and the time from when the presence of a person is no longer detected until the load stops can be adjusted, so that time adjustment suitable for the place of use becomes possible.

According to a sixth aspect of the present invention, in the first or the second aspect of the present invention, when a person is detected in the detection area, the sensor circuit supplies power to the lighting load and the ventilation fan, respectively. The power supply to the ventilation fan is cut off after a certain period of time after the power supply to the lighting load is cut off because the presence of a person is no longer detected.In this configuration, the ventilation fan continues to operate even after the lighting load is turned off. And
Since the ventilation fan stops after a certain period of time, useless power consumption due to a lighting load does not occur during use in a toilet or the like, and the ventilation fan can be operated sufficiently to discharge moisture and odor.

According to a seventh aspect of the present invention, in the first or second aspect of the present invention, the sensor circuit supplies power to the lighting load and the ventilation fan when a person is detected in the detection area. If a pause signal is received by operating an externally connected switch while power is being supplied to the vehicle, the power to the ventilation fan will be temporarily shut off, and the presence of a person in the detection area will not be detected. When the power supply is shut off, power is supplied to the ventilation fan only for a certain period of time, and in this configuration, when installed in a toilet and used in winter, it is possible to suppress the intrusion of cool air due to the operation of the ventilation fan, In addition, since the ventilation fan is operated after using the toilet, it is possible to sufficiently discharge moisture and odor.

According to an eighth aspect of the present invention, in the first or the second aspect of the present invention, the sensor circuit supplies power to the lighting load when a person is detected in the detection area, and the presence of the person in the detection area. When the power supply to the lighting load is cut off due to no detection of the power supply, the power supply to the ventilation fan is supplied only for a certain period of time. Similar to the invention of claim 7, when installed in a toilet, the ventilation fan operates during use. Therefore, intrusion of cold air can be suppressed in winter and the like.

According to a ninth aspect of the present invention, in the invention of the sixth to eighth aspects, a brightness sensor for detecting the ambient illuminance is provided, and the sensor circuit is configured such that the ambient illuminance detected by the brightness sensor is equal to or greater than a set value. Sometimes it is prohibited to supply power to the lighting load, and when installing in a toilet with windows, it is not necessary to turn on the lighting load when the surroundings are bright, so providing a brightness sensor reduces the lighting load. It is possible to prevent unnecessary lighting.

According to a tenth aspect of the present invention, in the first to ninth aspects, there is provided an automatic mode for supplying / cutting power to a load in response to detection of a heat ray by the sensor element, and detection of the heat ray by the sensor element. A mode switching switch capable of selecting between a continuous on mode in which power is supplied to the load irrespective of the load and a continuous off mode in which power is not supplied to the load irrespective of the detection of heat rays by the sensor element. By providing the switch, the continuous ON mode and the continuous OFF mode can be selected, and if these modes are used appropriately, the usability is improved.

[Brief description of the drawings]

FIG. 1A is a plan view showing a light receiving lens used in an embodiment of the present invention, and FIGS. 1B to 1D are explanatory views showing dimensions of respective parts.

FIG. 2 is a front view showing the embodiment of the present invention.

FIG. 3 is a side view of the same.

FIG. 4 is a bottom view with the decorative plate removed.

FIG. 5 is a partially broken plan view of the same.

FIG. 6 is a partially exploded development view of a main part of the above.

FIG. 7 is a partially cutaway side view of the movable body used in the above.

FIG. 8 is a plan view showing a terminal cover used in the embodiment.

9 (a) is a front view, FIG. 9 (b) is a plan view, FIG. 9 (c) is a bottom view, FIG. 9 (d) is a right side view, FIG. 9 (e) is a left side view, f) is A in FIG.
It is a direction arrow view.

FIG. 10 is an operation explanatory diagram showing a detection area according to the embodiment.

FIG. 11 is a block diagram of the above.

FIG. 12 is a specific circuit diagram of the above.

FIG. 13 is an explanatory diagram of the operation of the above.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heat ray sensor 2 Brightness sensor 4 Signal processing part 10 Body 15 Mounting hole 20 Cover 41 Light receiving lens 48a-48c Lens body 50 Mounting tool SW1 Sensitivity adjustment switch SW2 Mode changeover switch T1 Power supply terminal T2 Lighting terminal T3 Ventilation fan terminal VR1 Variable resistance vessel

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H05B 37/02 G01V 9/04 A (72) Inventor Shiro Mori 1048 Odakadoma, Kazuma, Osaka Prefecture Matsushita Electric Works, Ltd. (72) Inventor Hirotoshi Watanabe Hiroshi Watanabe 1048, Kazuma, Kadoma, Osaka Prefecture Matsushita Electric Works Co., Ltd.F-term (reference) BA28 CA01 CD01 CF13 CF14 CG06 CG09 CG15 CG19 CJ11 CJ17 CJ19 CJ21 CJ22 5C084 AA02 AA07 AA08 AA13 BB04 BB27 BB33 CC16 CC19 DD33 DD44 DD58 DD87 EE01 EE03 EE04 GG02 GG13 GG19 GG20 GG20 GG20 GG20 GG20 GG20 GG20 GG20 GG20 GG20 GG20 GG20 GG20 GG20 GG20 GG20 GG20 GG20 GG20 GG20

Claims (10)

[Claims] 1. A differential sensor element for detecting a heat ray radiated from a human body and generating an output according to a time change of an incident heat dose, and a person in a detection area based on the heat ray detected by the sensor element. An assembly of a sensor circuit that determines the presence or absence of a sensor and generates a detection output, a container housing the sensor element and the sensor circuit, and a number of lens bodies that converge a heat ray for each area in the detection area to the sensor element A light-receiving lens comprising: a hot-wire-type human body, wherein an opening angle between optical axes of a pair of adjacent lens bodies is set to be smaller in a part of the light-receiving lens than in the remaining area. Feeling sensor. 2. The light receiving lens, wherein the light receiving lens is formed in a hemispherical shape surrounding a light receiving surface of the sensor element, and an opening angle between optical axes of a pair of adjacent lens bodies is in front of the light receiving surface of the sensor element. 2. A hot-wire type human sensor according to claim 1, wherein the area near the center of the sensor is set smaller than the other area near the periphery of the light receiving lens. 3. The hot-wire type human sensor according to claim 1, wherein the container has fixing means for fixing the ceiling, and the light receiving lens is exposed on a lower surface of the container. 4. The hot-wire type human sensor according to claim 1, wherein the sensor circuit generates two detection outputs separately. 5. The sensor circuit is capable of separately supplying and shutting off power to two types of loads using each detection output, and is provided from when the presence of a person is no longer detected to when the power is shut off. At least one time adjusting means for changing the time of
5. The hot-wire type human sensor according to claim 4, wherein the sensor is provided for a system load. 6. The sensor circuit supplies power to the lighting load and the ventilation fan when a person is detected in the detection area, and supplies power to the lighting load when the presence of the person is no longer detected in the detection area. 3. The hot-wire type human sensor according to claim 1, wherein the power supply to the ventilation fan is cut off after a lapse of a predetermined time after the cutoff. 7. The sensor circuit supplies power to a lighting load and a ventilation fan respectively when a person is detected in the detection area, and includes a switch connected externally while supplying power to the lighting load and the ventilation fan. When a temporary stop signal is received, the power to the ventilation fan is temporarily shut off, and when the power to the lighting load is shut off because the presence of a person is no longer detected in the detection area, power is supplied to the ventilation fan for a certain period of time. The hot-wire type human sensor according to claim 1 or 2, wherein: 8. The sensor circuit supplies power to the lighting load when a person is detected in the detection area, and shuts off power to the lighting load when the presence of the person is no longer detected in the detection area. 3. The hot-wire type human sensor according to claim 1, wherein power is supplied to the power supply for a predetermined time. 9. A brightness sensor for detecting ambient illuminance, wherein the sensor circuit inhibits power supply to a lighting load when the ambient illuminance detected by the brightness sensor is equal to or greater than a set value. Claims 6 to 8
The hot-wire type human sensor described in any one of the above. 10. An automatic mode for supplying / interrupting power to a load in response to detection of a heat ray by a sensor element, a continuous input mode for supplying power to a load irrespective of detection of a heat ray by a sensor element, and a sensor 10. The hot-wire human sensation according to claim 1, further comprising a mode changeover switch capable of selecting a continuous cut-off mode in which power is not supplied to the load regardless of detection of the hot wire by the element. Sensor.