JP2758422B2 - Ultrasonic switch horn - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a horn of an ultrasonic switch for detecting a human body such as an automatic door.

[Conventional technology]

In the reflection type ultrasonic switch for human body detection of automatic doors, the mounting position of the sensor was conventionally on the ceiling,
In recent years, it has become mainstream to attach a sensor to a blind spot because a shutter is provided immediately before a door.

[Problems to be solved by the invention]

As shown in FIG. 26, when the sensor 102 of the reflection type ultrasonic switch 101 is attached to the blind portion 104 above the door 103,
The ultrasonic sensor 102 has a slower detection response than other sensors, and thus requires a large detection area 105. However, if the detection area 105 is too large, there is a problem that the ultrasonic waves are reflected by the concave and convex portions 103a such as the lattice of the door 103 and malfunction.

That is, the human body 106 coming to the door 103 is the detection area.
Upon entering 105, the ultrasonic switch 101 operates and the door 103 opens, but in actuality, the human body 106
Is within the detection area 105, the human body 1
It doesn't judge that 06 was caught. for that reason,
Actually, at the position of the maximum distance x of the detection area 105, the door 103 does not start to open, and the door 103 starts opening after approaching the door 103 considerably. Therefore, when the maximum distance x is shortened, the person 106 can
Will collide with the door 103 before it opens. In order to avoid this, it is necessary to make the maximum distance x sufficiently large.

However, if the maximum distance x is increased, the ultrasonic sensor 10
Even if the angle of 2 is greatly shaken, the detection area 105 hangs on the uneven portion 103a of the door 103, and a malfunction occurs.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a horn of an ultrasonic switch capable of detecting a human body quickly and providing a detection area capable of preventing a malfunction caused by a reflected wave from an uneven portion of a door or the like.

[Means for solving the problem]

The horn of the ultrasonic switch according to the present invention may be configured such that one of the inner surfaces facing each other is formed as a convex curved surface, and the other inner surface is formed as a concave curved surface, and the convex curved surface is formed with respect to the center line of the opening. The opening shape is formed such that the front detection area on the side of the side is wider than the front detection area on the concave curved surface side.

[Action]

According to the configuration of the present invention, the spread of the detection area is asymmetric, wide on the convex curved surface side of the inner surface of the horn, and narrow on the concave curved surface side. For this reason, when the detection area is installed above the door, the detection area that extends widely in front of the door and does not cover the surface of the door can be obtained by turning the narrower detection area toward the door.

〔Example〕

One embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is a longitudinal front view of the horn, and FIG. 2 is a longitudinal side view. The horn 1 is provided with a fitting cylinder 1c at the base end, and is fitted with an ultrasonic transducer 2 made of a microphone. The horn 1 has a front shape that gradually widens on both sides, and has one inner surface portion of the opposed side wall portion formed on the convex curved surface portion 1a and the other inner surface portion formed on the concave curved surface portion 1b. The positions of the open ends of the convex curved surface portion 1a and the concave curved surface portion 1b are symmetrical with respect to the center line 1 of the transducer 2. As shown in FIG. 2, inner surface portions 1d and 1e before and after the horn 1 are substantially parallel surfaces. As shown in FIG. 3B, the shape of the opening edge 1f of the horn 1 is formed in an oblong shape with its front and rear portions flattened.

FIG. 4 is an overall external view of the ultrasonic switch. The horn 1 is mounted on the front surface of the amplifier housing 3, and the amplifier housing 3 is mounted on a pair of brackets 5 provided on both sides so as to be rotatable up and down around a support shaft 6. The bracket 5 protrudes from the control circuit housing 4, and the control circuit housing 4 is provided with a mounting hole 8 for inserting a fixing screw 7 into a building material. As shown in FIG. 5, the control circuit storage unit 4 is
Set up at 10.

According to this configuration, as shown in FIG.
The 11 horn 1 has a shape that spreads to the convex curved surface portion 1a side and does not spread much to the concave curved surface portion 1b side. 11a is a boundary portion on the spreading side of the detection area 11, and 11b is a boundary portion on the non-spreading side. The side surface shape of the detection area 11 is a shape that spreads symmetrically back and forth as shown in FIG.

As described above, since the front shape of the detection area 11 is asymmetrical left and right with respect to the center of the transducer 2, the non-spread side of the detection area 11 can be directed toward the door 9 as shown in FIG. it can. As a result, the detection area 11 extends far in front of the door 9 and becomes a range that does not cover the uneven portion 9a such as the lattice of the door 9. Therefore, the detection of the human body 12 is quick, and there is no erroneous detection due to reflection from the uneven portion 9a of the door 9, and a stable detection operation can be obtained.

6 to 8 show a second embodiment. In this example, the inclination angles of the convex curved surface portion 1a and the concave curved surface portion 1b with respect to the center line 1 are different from each other, and the distances w ₁ and w ₂ from the center line 1 of the opening edge 1f to both ends are different from each other. The eccentricity ratio, that is, the ratio between the distances w ₁ and w ₂ can be freely set. Other configurations are first
This is the same as the embodiment. The detection area 11 'in this case is as shown in FIG. 7 and FIG. Thus, the convex surface
By changing the eccentricity ratio between the concave portion 1a and the concave curved surface portion 1b, the degree of eccentricity of the detection area 11 'can be changed, and it is easy to deal with the installation situation.

9 to 11, the distances w ₃ and w ₄ of the opening edges are made different from each other, and the ratio of the sum of the width in the longitudinal direction w and the width in the short direction z, which is the sum thereof, is different from the example in FIG. It is different. The side surface of the horn 1 also has a shape with a wide mouth as shown in FIG. The detection area 11 ″ in this case is
As shown in FIG. 10 and FIG. In this way, by appropriately combining the opening shape and the eccentricity ratio (ratio of w ₃ and w ₄ ) of the horn 1, more various detection areas can be formed, and it is easy to deal with the installation situation.

By preparing the horns 1 of the first to third embodiments, various detection areas can be freely selected.

FIG. 12 and FIG. 13 show a fourth embodiment. In this example, the length of the fitting portion 1c 'is increased so that a separation distance h can be obtained between the front surface of the transducer 2 and the front end of the fitting portion 1c'.

By varying the distance h and the diameter φ of the fitting portion 1c ', a biased detection area can be stably obtained even if the ambient temperature changes.

FIG. 14 and FIG. 15 show a fifth embodiment. In this example, an extension 1g is provided at the tip of the horn 1. By protruding the extension portion 1g in this manner, even if the ambient temperature changes, a detection area having a biased shape can be stably obtained.

FIG. 16 is an electric circuit diagram of an ultrasonic switch using the horn 1 of this embodiment, which will be described together with the time chart of FIG. The transmission signal (FIG. 17 (A)) applied to the transducer 2 is obtained by amplifying the high-frequency signal generated by the wave generating circuit 25 by the driver 26. The first monostable circuit 22 sets a pause period of the transmission signal, and the second monostable circuit 24 sets an application period. The first integration circuit 21 integrates at the same time when the power is turned on,
When a certain level is reached, the first monostable circuit 22 is driven. The switching circuit 23 is for discharging the first integration circuit 21.

The received signal of the transmitter / receiver 2 is amplified by the amplifier circuit 28 (FIG. 17 (B)), and then envelope detected by the detector 29. The amplified received signal includes a received signal part a of a human body and a received signal part b of a floor. The output of the detection circuit 29 (Fig. 17 (C)) is
Is determined whether or not reached the level detection circuit 30 to a predetermined detection level L _1, the output of the detection level L ₁ or more when (17
(E) is input to the second integration circuit 31. The second integration circuit 31 determines whether or not the time width of the input signal reaching the detection level is within a predetermined time width based on a predetermined level L ₂ (FIG. 17 (F)). That is, if this time is shorter than the predetermined time width, it is determined that the detected object is not a reflected wave but a noise. Further, the gate signal (FIG. 17 (D)) is applied from the gate 27 by the second integration circuit 31, and it is also determined whether or not the input wave is within a predetermined time. Gate 27
Is a time gate for determining a so-called detection distance for sending a gate signal (FIG. 17 (D)) after a certain period of time after receiving the signal of the first monostable circuit 22, and sending the signal to the second integrating circuit 31. . The flip-flop 32 stores the signal when there is an input wave determined to be within the gate time with a predetermined time width in the second integration circuit 31 (FIG. 17 (G)). This storage is reset by the second monostable circuit 24, and is no longer stored when there is no reflected wave. The third integrating circuit 35 integrates the output of the flip-flop 32. The integrated output (FIG. 17 (H)) is the reflected wave in succession twice is set to reach the switching level L _3, if within the gate time. When there is an output reaches a switching level L _3, the second switching circuit 33 turns on the relay 34. The relay 34 turns on and off the power of the door driving motor.

18 to 21 show other examples of the ultrasonic switch using the horn 1. FIG. In this example, a detection horn block 60 is constituted by an amplifier housing 3 to which a horn 1 is attached and a bracket 5 'rotatably supporting the amplifier housing 3, and the detection horn block 60 is fixed to a control circuit housing 4 by a fixing screw 40. It is attached detachably. The amplifier storage section 3 and the control circuit storage section 4 are connected by cords 41 and 42 and connectors 43 and 44. An additional connector 45 is provided in the control circuit housing section 4 via a cord 46. FIG. 21 is a circuit diagram of a control circuit.
Outputs of the driver 26 are connected to output terminals of the connector 44 and the extension connector 45, and inputs of the amplifier circuit 28 are connected to input terminals. Reference numeral 50 denotes an amplifier circuit in the amplifier housing block 3 of the detection horn block 60, which is connected between the transmitter / receiver 2 and the amplifier circuit 28. Reference numeral 60 'denotes an additional detection horn block, which has the same configuration as the detection horn block 60.

In the case of this configuration, since the detection horn block 60 including the transducer 2 is detachable from the control circuit housing section 4 and the connectors 42 and 43 and the connector 45 for addition are provided, the detection area Can be easily changed.

For example, as shown in FIG. 20, the control circuit storage part 4 is installed in the blind part 10 above the door 9 and the detection horn blocks 60 are provided before and after the door 9 to form the detection area 11 as shown in the figure. In the case that it was, the detection horn block 60 'was added to the ceiling 61,
A detection area 63 as shown by a broken line can be provided.
Thereby, the human body 12 can be detected from the near side.
The additional detection horn block 60 'is connected to the control circuit storage unit 4 by a cord 62. In this case, the relay harness 48 shown in FIG. 19 can be used as the cord 62. Door 9
If the detection area 11 is unnecessary on the front surface of the horn block 10, only one of the detection horn blocks 60 may be removed from the control circuit storage section 4 of the blind section 10 and installed on the ceiling 61 again.

FIG. 22 to FIG. 25 show still another example of the ultrasonic switch using the horn 1. In this example, malfunction is prevented by an air fault. Briefly, an indoor ultrasonic switch 70 and an outdoor ultrasonic switch 70 'are provided in the blind portion 10 above the door 9, and the outdoor ultrasonic switch 70 is detected for a certain time after the indoor ultrasonic switch 70 detects a human body. The detection capability of the ultrasonic switch 70 'is reduced.

FIG. 25 shows the circuit diagram. Indoor side ultrasonic switch 70
Operate the timer 72 with the output of the relay 34 when detecting the human body,
A signal for lowering the gain of the amplifier circuit 28 'of the outdoor ultrasonic switch 70' is provided from the switching circuit 78 for the set time of the timer 72. Indoor ultrasonic switch
The electric circuit 70 is the same as the example in FIG. The outdoor ultrasonic switch 70 'is the oscillation circuit 25 of the indoor ultrasonic switch 70.
From the driver input / output of the transducer 2 '. The other electrical circuit configuration of the outdoor-side ultrasonic switch 70 'is the same as that of the indoor-side ultrasonic switch 70, and the corresponding parts are denoted by the same reference numerals with dashes.

Indoor ultrasonic switch 70 and outdoor ultrasonic switch 70 '
Is as a parent and child machine. The indoor-side ultrasonic switch 70 is a master unit, and the outdoor-side ultrasonic switch 7 is a slave unit.
A connector 79 (FIG. 23) for connection to 0 'is provided.

Before describing the operation of this example, a problem of human body detection using ultrasonic waves will be described. Due to the installation of an air conditioner or refrigeration equipment, a large difference in air temperature may occur on both sides of the door. In cold regions, the interior is often heated by heating and the exterior is often cold. In such a case, the following malfunction occurs. As shown in FIG. 22, when the indoor ultrasonic switch 70 and the outdoor ultrasonic switch 70 'are provided in the blind section 10 to detect a human body and open the door 9, the human body is detected once and the door 9 is detected. Opens and a person leaves the detection area 11, and then the hot air 80 (Fig. 24)
An air fault 82 is generated between the air and the cold wind 81. This air fault 82
The ultrasonic wave is reflected at the point, and slightly exceeds the operation level. Therefore, the opening time of the door 9 becomes unnecessarily long. That is, the hot air 80 and the cold air 81 are mixed to reduce the temperature difference, and the door 8 remains open until the reflection of the air fault 82 becomes lower than the operation level. When the outside is cold and the room is warm, the reflection of the ultrasonic wave outside is large, and the ultrasonic switch 70 'on the outside often malfunctions.

However, according to the configuration of FIG. 25, when the indoor ultrasonic switch 70 detects a human body, the outdoor ultrasonic switch 70 '
The gain of the amplifier circuit 28 'is reduced by the time set by the timer 72, and the detection area is reduced. In FIG. 22, reference numeral 110 denotes a sandwiched detection area. Therefore, the air fault shown in Fig. 24
It does not detect reflection by 82 and eliminates malfunction. That is, the door 9 is reliably closed. When the ultrasonic wave is reflected by the air fault 82 and exceeds the operation level as described above, the operation level is slightly exceeded, and the operation level is not greatly exceeded even in the middle of winter. Therefore, it is not necessary to extremely lower the gain of the amplifier circuit 28 ', and this does not hinder detection of a human body. In this example, the outdoor ultrasonic switch
Although the transmission timing of the transmitter / receiver 2 'of 70' is obtained from the indoor side ultrasonic switch 70 which is the master unit, there is no problem of interference due to the shift of the transmission timing between the master unit and the slave unit. .

In this example, the detection level on the outdoor side is reduced, but the detection level on the indoor side may be reduced depending on the installation environment. In this example, the amplifier
Although the detection level was lowered by lowering the gain of 28 ',
The detection level may be lowered by lowering the output of the transmission.

〔The invention's effect〕

The horn of the ultrasonic switch of the present invention has one inner surface portion facing the convex curved surface portion and the other inner surface portion a concave curved surface portion, so that the horn inner surface is wide on the convex curved surface side and narrow on the concave curved surface side. A detection area is obtained. Therefore, when installed above the door, there is an effect that the detection of a human body is quick and a stable operation without malfunction due to reflection from an uneven surface such as a lattice of the door can be obtained.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional front view showing a horn and a detection area according to an embodiment of the present invention, FIG. 2 is a longitudinal sectional side view thereof, and FIG. 3 (A) is an enlarged longitudinal sectional front view of the same horn, FIG. (B) is a bottom view of the horn, FIG. 4 is an external perspective view of an ultrasonic switch using the horn, and FIG.
Fig. 6 is an explanatory view of the operation of the horn, Fig. 6 is a vertical sectional front view of the horn of the embodiment of Fig. 2, Fig. 7 is a vertical sectional front view showing the detection area, and Fig. 8 is a vertical side view showing the detection area. FIG. 9A is a longitudinal sectional front view of the third embodiment, and FIG.
FIG. (B) is a bottom view, FIG. 10 is a vertical sectional front view showing the detection area, FIG. 11 is a vertical side view showing the same detection area, and FIG. 12 is a vertical front view of the fourth embodiment. ,
FIG. 13 is a longitudinal side view, FIG. 14 is a longitudinal front view of the fifth embodiment, FIG. 15 is a perspective view thereof, and FIG. 16 is an example of an electric circuit of an ultrasonic switch using the horn of this embodiment. FIG. 17 is a block diagram, FIG. 17 is a waveform diagram thereof, FIG. 18 is a perspective view of another example of the ultrasonic switch using the horn, FIG. 19 is an exploded perspective view thereof, and FIG. FIG. 21 is a block diagram of an electric circuit thereof, FIG. 22 is an explanatory diagram of still another use example of the horn, FIG. 23 is a perspective view of an indoor side ultrasonic switch thereof, FIG. FIG. 25 is an explanatory diagram of the operation, FIG. 25 is a block diagram of the electric circuit, and FIG.
The figure is an explanatory view of a conventional example. 1 horn, 1a convex section, 1b concave section, 2
... Transducer, 11 ... Detection area, 3 ... Amplifier storage,
4 Control circuit storage section, 9 Door, 12 Human body

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G01S 7/52 H04R 1/00-1/40

Claims (1)

(57) [Claims] 1. An inner surface portion facing one side is formed as a convex curved surface portion, and the other inner surface portion is formed as a concave curved surface portion, and a front side of the convex curved surface portion side with respect to a center line of an opening is detected. A horn of an ultrasonic switch having an opening formed such that an area is wider than a front detection area on the concave curved surface side.