JPH06294865A - Ultrasonic wave switch - Google Patents

Abstract

PURPOSE:To provide an ultrasonic wave switch which can detect whether an object to be detected enters, exit, or exists in a specific area using one ultrasonic vibrator. CONSTITUTION:A signal processing part 1 provides a wave transmission control signal for supplying an ultrasonic wave reference signal to an oscillation part 3 that for supplying it continuously and sets periods for performing Doppler detection and pulse detection. The signal processing part 1 detects the movement of the human which is an object to be detected by Doppler signals X and Y from a Dopper detection processing part 5 during the period of Doppler detection. On the other hand, it reads the reflection wave pattern from a pulse detection processing part 4 during the period of pulse detection and compares it with a fixed environmental value, detects whether a human being is present or not, drives a relay drive part when the human being is moving inside the area of movement detection or exits inside the area of presence detection and lights a lighting L, or performs ventilation operation of an air fan F.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultrasonic switch provided in a room such as a toilet.

[0002]

2. Description of the Related Art Conventionally, as a detection switch for automatically turning on / off a lighting in a room by detecting a person entering the room, staying in the room, or leaving the room, there is a detection switch which detects a heat ray emitted by a person. . However, such a heat ray type detection sensor detects the movement of a person due to the characteristics of the pyroelectric element that detects the heat ray, so if it is used in a place where the person has a long time to rest, such as a toilet, There is a problem that the lighting goes out. Therefore, in general, a timer is also used so that the ON state of the illumination is maintained for a certain period of time.

[0003]

In the case where the timer is provided as described above, there is a problem that if the timer time is lengthened, the lighting does not go out easily even if a person leaves the room. Other than the hot-wire system, there is one using an ultrasonic switch, but the Doppler system has the same problem as the hot-wire system because it only detects the movement of a person like the hot-wire system. Further, in the case of the pulse method for detecting the presence or absence of a person, there is a problem that malfunction occurs when there is an environmental change such as an object placed in the detection area.

The present invention has been made in view of the above problems, and an object of the present invention is to use an ultrasonic transducer to move an object in and out of a predetermined area. , To provide an ultrasonic switch capable of detecting presence. The object of the invention of claim 2 is that
The invention according to claim 1 provides an ultrasonic switch which can be easily mounted on a ceiling panel without a box.

The object of the invention of claim 3 is that in the invention of claim 2, the device of the wave transmitter / receiver is arranged so that the direction of the horn of the wave transmitter / receiver incorporating the ultrasonic transducer can be freely changed. It is to provide an ultrasonic switch capable of accommodating the body. An object of the invention of claim 4 is to provide an ultrasonic switch according to the invention of claim 2 in which a decorative plate can be selected and attached according to the atmosphere of the place to be attached.

[0006]

According to a first aspect of the present invention, an ultrasonic transducer for transmitting and receiving waves and a first period in which ultrasonic waves are intermittently transmitted from the ultrasonic transducer are continuously transmitted. A wave transmission control unit that alternately and repeatedly sets a second period for wave generation,
A first detection processing unit that outputs a received signal output from the ultrasonic transducer during a first period as a signal for detecting the presence or absence of a detected object; The second detection processing unit that outputs a Doppler signal from the frequency shift of the received wave signal that is output, and the presence or absence of a detected object in the detection area for existence based on the signal that is output from the first detection processing unit Then, the signal processing means for detecting the entrance and exit of the object to be detected into and out of the detection area for movement detection from the Doppler signal output from the second detection processing unit, and generating the switch output for load control based on the detection results of both. It is equipped with.

According to a second aspect of the present invention, in the first aspect of the present invention, the switch main body is fitted into an embedded hole provided in the ceiling panel from a lower surface side of the ceiling panel, and is attached to a lower peripheral portion of the switch main body. The frame is detachably mounted with a mounting member provided with a sandwiching body for sandwiching the ceiling panel around the embedding hole with the upper surface of the mounting frame.

According to a third aspect of the present invention, in the second aspect of the present invention, the lower portion of the body of the substantially spherical transducer, which is constructed by accommodating an ultrasonic transducer at the bottom of the switch body, is rotatably accommodated. 3. The ultrasonic switch according to claim 2, wherein a storage recess is provided, and a horn at the bottom of the body is exposed to the outside through a window provided in the storage recess. According to the invention of claim 4,
In the invention of claim 2, means for detachably attaching the decorative panel is provided on the lower surface of the mounting frame, and the decorative panel selected from a plurality of decorative panels of different colors can be attached.

[0009]

According to the invention of claim 1, a single period is used as a pulse type ultrasonic switch and a second period is operated as a Doppler type ultrasonic switch using one ultrasonic transducer. Can be set alternately, and it is possible to detect the presence or absence of the detected object in the predetermined area and the presence or absence of the detected object. Therefore, load control is automatically performed only when the detected object exists in the predetermined area. You can
For example, when turning on / off the illumination of the toilet, it is not necessary to use a timer or the like, and the illumination can be turned on only when a person is present in the room without being affected by the environment.

According to the second aspect of the invention, by mounting the mounting bracket on the mounting frame, the mounting on the ceiling panel without a box can be easily performed. According to the invention of claim 3, in the invention of claim 2, the transducer body can be housed so that the direction of the horn of the transducer incorporating the ultrasonic transducer can be freely changed. .

According to the invention of claim 4, the decorative plate can be selected and attached according to the atmosphere of the place of attachment, and can be matched with the place of attachment.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows the overall circuit configuration of an embodiment for the purpose of automatic control of a toilet lighting L and a ventilation fan F. In this embodiment, a signal arithmetic processing unit 1 including a microcomputer for overall signal processing and control. And an ultrasonic transducer 2 for transmitting and receiving waves, and an ultrasonic signal for driving the ultrasonic transducer 2 are oscillated, and ultrasonic waves are transmitted to the ultrasonic transducer 2 based on a transmission control signal from the signal calculation processing unit 1. An oscillating unit 3 that intermittently applies an acoustic wave signal to transmit an ultrasonic pulse or continuously supplies an ultrasonic pulse, and a first period during which an ultrasonic wave is intermittently transmitted. Between the pulse detection processing unit 4 that detects and outputs the received wave signal of the reflected wave received by the ultrasonic transducer 2 and the received signal of the reflected wave received by the ultrasonic transducer 2 and the transmitted signal. That outputs Doppler signals X and Y with different phases depending on the frequency deviation of The detection processing unit 5, the relay driving units 6 and 7 that drive the relay with the control signal from the signal calculation processing unit 1, and the relay driving units 6 and 7 are automatically controlled based on the signals of the detection processing units 4 and 5. It is possible to automatically control the lighting of the illumination L by the operation changeover switch 8 for setting whether to drive off or on regardless of detection, and the relay contact r ₁ of the relay driven by the relay drive unit 6. For setting the delay off time of the ventilation fan F that is turned on / off by the operation illuminance adjustment switch 9, the illuminance sensor 10, and the relay contact r ₂ of the relay driven by the relay drive unit 7. Reset I for resetting the ventilation fan delay adjustment unit 11, the operation display LED 12, the stabilized DC power supply unit 13, and the signal calculation processing unit 1 when the power is turned on.
Each of the detection processing units 4 and 5, the operation changeover switch 8, the operation illuminance adjustment switch 9, and the ventilation fan delay adjustment unit 11 is provided with C14 and a clock oscillator 15 for giving a basic clock to the signal calculation processing unit 1. The signal output terminal is connected to a predetermined input port of the signal calculation processing section 1, and the relay driving section 6,
7. The operation display LEDs 12 are connected to predetermined output ports of the signal calculation processing section 1, respectively.

FIGS. 2 to 4 are views showing the structure of the embodiment. The switch of this embodiment has a disk-shaped mounting frame 20 and an upper surface integrally provided at the center of the mounting frame 20. The main body 21a of the opening and the cover 21b attached to the upper opening of the main body 21a constitute a switch body 21, and the printed wiring boards 17a and 17b in which the members of the circuit section described above are mounted in the switch body 21 and The transmitter / receiver 16 including the ultrasonic transducer 2 and the like is mounted.

The body 21a is provided with a storage recess 23 having a circular cross section on the upper surface side, with the bottom center portion bulging downward.
A round window 2 penetrating in and out is formed in the central bottom of the storage recess 23.
2 is bored, and the lower portion of the wave transceiver 16 is fitted so that the wave transmission / reception port of the horn 24 of the wave transceiver 16 faces the outside from the round window 22. The transducer 16 is configured by accommodating the ultrasonic transducer 2 inside a body including a substantially hemispherical horn 24 and a substantially hemispherical rotator 25 attached to an upper surface opening of the horn 24. The horn 24 housed in the housing recess 23 is provided with a shaft portion 28 on both side surfaces, and the shaft portion 28 is vertically movable in a vertical groove 59 provided on the inner peripheral surface of the housing recess 23. In addition, it is inserted rotatably in the direction around the axis so that the direction of the transducer 16 can be changed. The ultrasonic vibrator 2 is housed in the body in a form of being housed in a cylindrical cushion body 26 so that vibrations from the horn 24 and the rotating body 25 are not transmitted.

Above the storage recess 23, a U-shaped pressing metal fitting 29 is screwed to the bottom of the body 20 so as to bridge both sides of the storage recess 23, and a coil spring 30 is provided below the lower surface of the pressing metal fitting 29 to move downward. The horn 24 is pressed against the rib 33 provided on the inner surface of the accommodating recess 23 by pressing the upper portion of the rotating body 25 downward through the O-ring 32 made of an elastic body by the supporting body 31 attached so as to be biased. The
The wave transmitter / receiver 16 can be held in the rotating position.

The support 31 is provided with a shaft 31a at the center of its upper surface, and legs 31b are provided on both upper surfaces of the shaft 31a so as to project therefrom.
The coil spring 30 is inserted into the shaft 31a, and the tip of the coil spring 30 is vertically inserted into the central hole 29a of the metal fitting 29, and the legs 31b are vertically inserted into holes 29b provided on both sides of the hole 29a. The elastic force of the spring 30 always urges downward. The leg 31b is provided with a locking projection 31c at its tip so as not to come off from the hole 29b.

The printed wiring boards 17a and 17b are upper and lower
Arranged in the cover 21b so as to be overlapped with each other
The printed wiring board 17a on the upper side has a lock spring on the upper surface.
35 and a release button 36 for releasing the locked state
Three pairs of the terminal plates 37 constituting the child are mounted and
Relay Ry driven by the relay drive units 6 and 7₁, Ry ₂
Is mounted on the lower part of the printed wiring board 17b.
It is electrically connected to the road by a flat cable 38. Mosquito
An electric wire insertion port 2 corresponding to a quick-connect terminal is provided on one side of the bar 21b.
7a and a release jig insertion opening 27b corresponding to the release button 36
And the terminal cover 19 is drilled at this drilling location.
It is designed to be detachably attached. 19a is a terminal
Locking legs that protrude downward from both sides of the bar 19
Removably engage with the locking hole 63 provided in the bar 21b.
To fix the terminal cover 19 to the cover 21b.
It is a thing.

The quick-connect terminals of each pair are terminals 60, 60 for connecting the AC power source AC in FIG. 1, load terminals 61, 61 for connecting the lighting L, and a load terminal 62 for connecting the ventilation fan F, Corresponding to 62. Further, in FIG. 2, the locking spring 35
Although the release buttons 36 are shown only in the number corresponding to the pair of terminal plates 37, the lock springs 35 and the release buttons 36 are actually provided corresponding to the pair of terminal plates 37. Needless to say

The lower printed wiring board 17b is connected to the lead wire from the ultrasonic oscillator 2 led out from the notch 25a provided in the rotating body 25 of the transducer 16 to connect the ultrasonic oscillator 2 to it.
Is connected to the circuit section. The cover 21b is the body 21a
It is attached to the upper surface opening of the body 21 at this time.
A projecting piece 34 is provided above the upper ends of both side walls of a to cover 21
Insert the protrusions 3 into the vertical grooves 39 formed on both side surfaces of a.
The coupling projections 39a provided in the lower portion of the vertical groove 39 are coupled to the coupling holes 34a formed in the cover 4, and the cover 21b is formed.
And the body 21a.

At this time, the operation display LED mounted on the lower printed wiring board 17b housed in the cover 21b.
The light emitting surface of 12 and the light receiving surface of the illuminance sensor 10 are the body 2
The prism 40 mounted on the 1a side faces the entrance surface and the exit surface provided to allow the light of the luminescent display to be led out or the outside light to enter through the prism 40. The prism 40 is formed in an inverted L shape, and is fixed by fitting the bosses 18 projecting from the bottom surface of the body 21a into the holes of the mounting portions 40a provided on both sides of the corner, and storing the hanging piece. The lower end is exposed on the lower surface side of the body 21a by fitting in the window hole 41 opened along the inner peripheral surface of the recess 23. The corner portion of the boundary between the horizontal piece and the hanging piece of the prism 40 is an inclined surface of a half mirror structure, and the light incident from the lower end of the hanging piece is emitted from the half mirror portion to the outside of the rhythm and arranged oppositely. The illuminance sensor 10 that has been operated is made to receive light. On the other hand, the tip of the horizontal piece is an inclined surface cut at 45 °, and the light from the operation display LED 12 arranged facing the upper surface of the tip of the horizontal piece is totally reflected by the inclined surface inside the prism to be bent. The light is reflected by the half mirror portion and emitted to the outside from the tip of the hanging piece.

The mounting frame 20 has mounting holes 42 for direct attachment to a switch box or ceiling panel at both ends, and mounting brackets 43 for sandwiching the ceiling panel are detachably mounted on the upper surfaces of both sides. A mounting part is provided. Further, a decorative plate 50 is detachably attached to the lower surface. The mounting bracket 43 can be mounted without a box in an embedded hole formed in a ceiling panel, and is a vertically long bracket main body 44 with one side open.
And a screw body 4 which penetrates the bottom of the metal fitting body 44 from below and rotatably holds the tip of the metal fitting body 44 on the ceiling of the metal fitting body 44.
5 and a metal sandwiching body 46 in which the threaded portion of the screw body 45 is screwed into the screw hole, and is mounted on the mounting frame 20 as follows.

First, the head portion of the screw body 45 is fitted into the round hole portion of the Daruma hole 47 formed in the mounting frame 20 from the upper surface side of the mounting frame 20 to expose the lower surface side of the mounting frame 20.
At the same time, the fixing pieces 49 provided on both sides of the lower surface of the metal fitting body 44 are fitted into the fixing grooves 48 provided on the upper surface of the mounting frame 20 in parallel on both sides of the daruma hole 47. Fixing piece 49 in this state
While moving the metal fitting body 44 toward the center of the mounting frame 20 while sliding the metal fitting in the fixing groove 48,
The screw portion of the screw body 45 exposed to the outside from the lower surface of the is guided by the long hole portion of the daruma hole 47, and the mounting frame 20 is sandwiched between the lower surface of the metal fitting body 44 and the head portion of the screw body 45. Further, the fixing piece 49 is intervened between the locking piece provided in the fixing groove 48 and the bottom of the fixing groove 48, and the mounting of the mounting bracket 43 on the mounting frame 20 is completed.

The decorative plate 50 is provided with a concave flat surface 51 into which the mounting frame 20 is fitted, and locking projections 20a protruding from the peripheral edge of the mounting frame 20 on both sides of the inner surface of the peripheral wall 51a surrounding the concave flat surface 51, A locking groove 52 that engages with 20a is provided, and the locking projections 20a and 20b can be attached and detached by utilizing the tapered surfaces of the locking projections 20a and 20b and the elasticity of the decorative plate 50 and the elasticity of the mounting frame 20. It is adapted to be locked in the locking groove 52. The positioning of the locking positions of the locking projections 20a and 20b with respect to the locking groove 52 is performed by the locking projection 20.
the protrusion 20c provided at the center between the a and the 20a
It is performed by fitting in the recessed portion 51b formed in 1a. The round hole 50a at the center of the decorative plate 50 is for exposing the bulging portion protruding to the lower surface of the center of the body 21a to the outside. It should be noted that the decorative plate 50 can be prepared in a plurality of different colors so as to correspond to the color of the ceiling at the installation location.

Thus, in the present embodiment having the above-described structure, the mounting member 43 or the mounting hole 4 is mounted on the ceiling of a toilet or the like.
Use 2 to mount and fix. Here, a method of mounting the switch body 21 on the ceiling using the mounting bracket 43 will be briefly described. First, the mounting bracket 43 is inserted into a notch 44a formed in one side wall of the metal fitting main body 44 on the side opposite to the tightening direction of the screw body 45, and the holding body 46 is parallel to the side surface of the switch main body 21 to move the switch main body 21 The holding body 4 when it is fitted in the embedded hole formed in the ceiling panel.
6 is out of the way. That is, the cross-sectional shape of the switch main body 21 is a shape obtained by cutting both sides of the circle, and the diameter of the embedded hole provided on the ceiling panel side is provided so as to correspond to the circular diameter forming the switch main body 21. Therefore, the part corresponding to the above-mentioned cut part becomes an empty space,
The state in which the tip of the holding body 46 of the mounting bracket 43 arranged in this space portion is housed so as not to project from the empty space is the state where the holding body 46 is fitted in the notch 44a.

Next, the switch main body 2 is provided on the upper surface side of the ceiling panel.
1 and the mounting bracket 43 are projected through the embedded hole, and the head of the screw body 45 exposed on the lower surface side of the ceiling panel is used while the upper surface of the mounting frame 20 is in contact with the lower surface of the ceiling panel. When the screw body 45 is rotated in the tightening direction with a screwdriver or the like, the holding body 46 comes out of the notch 44a by the rotation of the screw body 45, and the side end contacts the other side wall of the metal fitting body 44. That is, the tip of the holding body 46 is oriented in a direction orthogonal to the side surface of the switch body 21, and at this time, the tip of the holding body 46 is located outside the projection range of the embedding hole and above the ceiling panel.

When the screw body 45 is further rotated in the tightening direction, the holding body 46 is lowered downward because it is restricted in rotation, and the tip of the holding body 46 eventually comes to the top surface of the ceiling panel. Then, the ceiling panel is sandwiched by the mounting frame 20 and the switch body 2 is attached to the ceiling panel.
1 is fixed. Now, after fixing the switch body 21 to the ceiling panel, if the decorative plate 50 is attached to the lower surface of the mounting frame 20, the mounting of the ultrasonic switch of this embodiment is completed, and the terminals 60 to 62 using the quick-connect terminals are attached. If the AC power supply AC, the lighting L, and the ventilation fan F are connected, the electric wiring work is completed.

Next, the ultrasonic switch of this embodiment is installed in the toilet 70.
The operation when arranged on the ceiling will be described with reference to FIGS. 5 and 6. First, in use, the operation knob of the operation changeover switch 8 exposed on the lower surface of the mounting frame 20 is operated to set the operation mode. Here, it is assumed that the setting is automatic. Similarly, the operating illuminance adjustment switch 9 exposed on the lower surface of the mounting frame 20 is operated to adjust the operating illuminance to 20 lx.
Or set to 40 lx. Here, it is assumed that it is set to 20 lx.

FIG. 5 shows the state set as described above.
As shown in FIG. 5A, when the power is turned on to start the operation, the oscillator 3 starts oscillating the ultrasonic signal as the reference oscillation signal as shown in FIG. 5C. On the other hand, the signal calculation processing unit 1
Starts the operation in the initial setting state, and sends the ultrasonic wave transmission control signal to the oscillating unit 3 for 3 seconds, for example, for 3 seconds from the power-on until the circuit operation becomes stable, as shown in FIG. 5 (d). The wave remains stopped as shown in Figure 5 (e). Well 3
After a lapse of a second, the signal calculation processing unit 1 relays the relay contacts r ₁ and r to the relay driving units 6 and 7 as shown in FIG.
An OFF signal for driving the relays Ry ₁ and Ry ₂ to OFF is applied so that ₂ is turned OFF, and the illumination L and the ventilation fan F are set to the OFF state.

Next, the signal calculation processing section 1 judges the state of the operation changeover switch 8, and if it is the manual OFF side, the relay contact r.
Control for holding the OFF state of ₁ and r ₂ and, on the contrary, driving the relays Ry ₁ and Ry ₂ so that the relay contacts r ₁ and r ₂ are turned on to the relay drive units 6 and 7 on the ON side. Give a signal. Since it is automatically set here, the signal calculation processing unit 1 checks the setting state of the operation illuminance changeover switch 9, and the set value and the illuminance sensor 10 shown in FIG. 5B.
If the detected illuminance is not less than or equal to the set value, the ultrasonic detection is invalidated and the off state is maintained. If it is less than the set value, the state where the detection of the ultrasonic switch is enabled is entered.

After the lapse of 3 seconds, the signal calculation processing section 1 intermittently gives an ultrasonic wave signal to the ultrasonic transducer 1 to the oscillating section 3, and a period and an environment in which the ultrasonic wave signal is continuously given. A wave transmission control signal that sequentially and alternately sets the stabilization waiting period is output as shown in FIG. The oscillating unit 3 receives the transmission control signal and transmits a transmission drive signal to the ultrasonic transducer 1 as shown in FIG. 5E, intermittently transmits ultrasonic waves during the period, and continuously transmits during the period. Then, ultrasonic waves are transmitted to start the detection operation. 5F and 5G show Doppler signals X and Y having different phases output from the Doppler detection processing unit 5 based on the received signal of the reflected wave received by the ultrasonic transducer 2. Further, FIG. 5H shows a pulse signal output from the pulse detection processing unit 4 corresponding to the received signal of the reflected wave when the ultrasonic wave is intermittently transmitted.

Immediately after the start of the detection operation, the signal calculation processing unit 1 stores the output signal pattern output by the pulse detection processing unit 4 in the second period as the initial value of the reflected wave pattern from the fixed object in the toilet. To do. Now, when the detection operation is started, as shown in FIG.
In the state where is not included, since the moving object does not exist in the detection area A of the moving object, the moving signal by the Doppler detection does not exist as shown in (A) of FIG. The reflected wave pattern shown in (B) of FIG. 6A for intermittent transmission is the same as the stored initial value, and therefore the signal arithmetic processing unit 1 determines that the person M does not exist in the toilet 70, and relays it. The off state of Ry ₁ and Ry ₂ is continued.

Next, when the door 71 of the toilet 70 is opened as shown in FIG. 6 (b), the Doppler signal output from the Doppler detection processing unit 5 with the door 71 in the moving object detection area A is displayed. For X and Y, (A) of FIG.
A moving signal is included as shown in FIG. When the movement signal is detected, the signal calculation processing section 1 outputs the pulse detection processing section 4 before the movement signal is detected as shown in FIG.
The reflected wave pattern shown in (B) of (b) is stored as an environmental value, and when the amount of the movement signal becomes equal to or more than the threshold value, the signal arithmetic processing unit 1 causes the relay driving units 6, 7 to relay Ry ₁ , Ry.
A control signal for turning on ₂ is given as shown in FIG. 5 (i), and relay contacts r ₁ , r ₂ of the respective relays Ry ₁ , Ry ₂ are applied.
Turn ₂ on. When these are turned on, the illumination L is turned on and the ventilation fan F performs ventilation operation. At the same time, as shown in FIG. 5 (k), a signal for driving the operation display LED 12 is output and turned on to indicate that it is in operation.

Further, when the person M moves into the toilet 70 as shown in FIG. 6 (c), the movement signal continues to be detected as shown in FIG. 6 (c) (A), and further detection for presence / absence detection is performed. When the person M enters the area B, the reflected wave pattern detected during the period is different from the environmental value as shown in (B) of FIG. 6C, and thus the signal arithmetic processing unit 1 determines that the person M exists. When there is this presence detection, the presence detection is given priority and the relays Ry ₁ and Ry
Continue to drive ₂ on. Simultaneous operation display LED
Blink 12

Next, the door 71 is closed, and the person M moves to the toilet side.
In the state of proceeding as shown in (d), detection of the movement signal continues as shown in (A) of FIG. 6 (d), and presence detection also continues as shown in (B) of FIG. 6 (d). . Then toilet bowl 72
When the person M sits down as shown in FIG. 6 (e) and becomes stationary, the detection of the movement signal disappears as shown in FIG. 6 (e) (A), but as shown in FIG. 6 (e) (B). As above, person M
Since the presence detection of the relays continues, the presence detection is prioritized and the ON driving of the relays Ry ₁ and Ry ₂ is continued similarly.

In this stationary state, it is of course that the movement signal is detected if the head or hand is moved slightly, not just to be completely stationary. Now, when the person M gets out of the toilet 70, as shown in FIG.
Although the person 1 is to be opened and exited, the person M first comes out of the detection area B. At this point, the presence detection is lost as shown in FIG. 6 (f) (B), but FIG. Since the movement signal is detected as shown in (A) of), the movement detection is prioritized and the ON driving of the relays Ry ₁ and Ry ₂ is continued. When the movement signal is detected but the presence is not detected, the lighting state of the operation display LED 12 is switched to continuous lighting.

When the person M exits the detection area A as shown in FIG. 6 (g) and the door 71 is closed, the movement signal of the movement signal as shown in FIG. 6 (f) (A) is displayed. Since the detection is also lost, after the off-delay time has elapsed from this point, the signal calculation processing section 1 gives a signal for driving the relays Ry ₁ and Ry ₂ to off to each of the relay driving sections 6 and 7, and also turns off the operation display LED. Of. At this time, the reflected wave pattern by the ultrasonic pulse has returned to the pattern of the environmental value as shown in (B) of FIG.

The stop of the ventilation fan F at this time is based on the off delay time set by the ventilation delay adjusting unit 11 and the lighting L is stopped.
It will be later than the time of turning off. By the way, in FIGS. 6 (f) and 6 (g), when the reflected wave patterns in the period before and after the movement signal is detected are the same, it can be determined that the person M is moving outside the detection area B. If the reflected wave pattern at the time is different from the initial environmental value,
This reflected wave pattern is stored as a new environment value. In this case, for example, an off-delay time of 30 seconds is set, and if presence is detected again after the off-delay time has elapsed, the ON driving of the relays Ry ₁ and Ry ₂ is continued based on the presence detection. In other words, considering the actions of multiple people M,
It is possible to cope with a situation in which one person stands still and another person goes out of the detection area A.

FIG. 7 is a flow chart showing the above operation.

[0039]

According to the invention of claim 1, the ultrasonic transducer for transmitting and receiving waves, the first period for intermittently transmitting ultrasonic waves from the ultrasonic transducer, and the second period for continuously transmitting ultrasonic waves. And a first detection for outputting the received wave signal output from the ultrasonic transducer in the first period as a signal for detecting the presence or absence of the detected object. A processing unit, a second detection processing unit that outputs a Doppler signal from the frequency shift of the received signal output from the ultrasonic transducer in the second period, and a signal output from the first detection processing unit The presence / absence of the detected object is further detected in the detection area for presence / absence, and the detection object entering / exiting the detection area for movement detection is detected from the Doppler signal output from the second detection processing unit. Signal processing to generate switch output for load control based on Since the means is provided, one ultrasonic transducer is used to alternately set the first period operating as the pulse type ultrasonic switch and the second period operating as the Doppler type ultrasonic switch. It is possible to detect the presence or absence of the detected object in the predetermined area and the presence / absence of the detected object. Therefore, load control can be automatically performed only when the detected object exists in the predetermined area. When turning on / off the toilet lighting, it is not necessary to use a timer or the like, and the lighting can be turned on only when a person is in the room without being affected by the environment. is there.

According to a second aspect of the present invention, the switch main body is fitted into the embedded hole provided in the ceiling panel from the lower surface side of the ceiling panel, and the mounting frame protruding to the lower peripheral portion of the switch main body has the upper surface of the mounting frame. Since the mounting bracket with the sandwiching body that clamps the ceiling panel around the embedding hole is attached detachably, the mounting bracket can be easily mounted on the ceiling panel without a box by mounting the mounting bracket on the mounting frame. effective.

According to a third aspect of the present invention, in the invention of the second aspect, the lower portion of the body of the substantially spherical transducer, which is constructed by accommodating an ultrasonic transducer at the bottom of the switch body, is rotatably accommodated. Since the storage recess is provided, and the horn at the bottom of the body is exposed to the outside through the window provided in this storage recess, it is possible to freely change the direction of the horn of the transceiver that has the ultrasonic transducer built-in. In addition, there is an effect that the transmitter / receiver body can be stored.

According to a fourth aspect of the present invention, in the second aspect of the present invention, means for detachably attaching the decorative panel is provided on the lower surface of the mounting frame, and the decorative panel selected from a plurality of decorative panels of different colors is attached. Since it can be worn, the decorative plate can be selected and attached according to the atmosphere of the place of attachment, and there is the effect that it can be matched to the place of attachment.

[Brief description of drawings]

FIG. 1 is a circuit configuration diagram of an embodiment of the present invention.

FIG. 2 is an exploded perspective view of the above.

FIG. 3 (a) is a side view of the same. (B) is a bottom view of the same decorative plate removed.

FIG. 4 (a) is a front view of the same. (B) is a bottom view of the same decorative plate attached.

FIG. 5 is a timing chart for explaining the above operation.

FIG. 6 is an operation explanatory diagram of the above-described usage example.

FIG. 7 is a flowchart for explaining the same operation as above.

[Explanation of symbols]

1 Signal calculation processing unit 2 Ultrasonic transducer 3 Oscillation unit 4 Pulse detection processing unit 5 Doppler detection processing unit 6, 7 Relay drive unit L Lighting F Ventilation fan r ₁ , r ₂ Relay contact

Claims (4)

[Claims] 1. An ultrasonic transducer for transmitting and receiving waves, a first period for intermittently transmitting ultrasonic waves from the ultrasonic oscillator, and a second period for continuously transmitting ultrasonic waves are alternately repeated. A transmission control unit to be set, a first detection processing unit that outputs a reception signal output from the ultrasonic transducer during the first period as a detection signal indicating whether or not a detected object is present, and a second A second detection processing unit that outputs a Doppler signal from the frequency shift of the received signal output from the ultrasonic transducer during the period;
The presence / absence of an object to be detected is detected from the signal output from the first detection processing unit in the detection area for presence / absence, and the detection area for movement detection is detected from the Doppler signal output from the second detection processing unit. An ultrasonic switch characterized by comprising signal processing means for detecting the entrance / exit of a detection object and generating a switch output for load control based on the detection results. 2. The switch main body is fitted in an embedded hole provided in a ceiling panel from a lower surface side of the ceiling panel, and a mounting frame projecting to a lower peripheral portion of the switch main body has an upper surface of the mounting frame and a periphery of the embedded hole. 2. The ultrasonic switch according to claim 1, wherein a mounting bracket provided with a sandwiching body for sandwiching the ceiling panel is detachably mounted. 3. A bottom of the switch body is provided with a storage recess for rotatably storing the lower part of the body of a substantially spherical transducer configured to store an ultrasonic transducer. The storage recess is provided in the storage recess. The ultrasonic switch according to claim 2, wherein the horn at the bottom of the body is exposed from the window to the outside. 4. A decorative panel is provided on the lower surface of the mounting frame so that the decorative panel can be removably attached, and the decorative panel selected from a plurality of decorative panels of different colors can be attached. Ultrasonic switch described.