JPS61162779A - Window opening/closing sensor - Google Patents

Abstract

PURPOSE:To discriminate the opening and closing state of a door pane or a window pane, by transmitting an ultrasonic wave with a transmitter comprising an ultrasonic vibrator into a vehicle, a dwelling room or the like. CONSTITUTION:The ultrasonic wave transmitted into a space area in a dwelling room, a vehicle or the like with a transmitter 1 normally has components of thermal noises of amplification circuits 5 and 8 or the like appearing at the output of the amplification circuit 8 when a window glass or the like is closed. But when the window pane or the like is opened, a Doppler component is generated due to the movement and the oscillation of air and when the Doppler component is received with a receiver 4, it is amplified to create saturation. Thus, comparing outputs of a detector 7 with a comparator 9 enables the detection of opening or closing stage of the window pane or the like. Depending on the output of the comparator 9, an output driving circuit 10 generates a signal when the window pane is opened or closed to drive a display or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention is directed to the invention,
This invention relates to a window opening/closing sensor that determines the open/closed state of door laths and window laths inside a house.

[Background Art] Conventionally, as a device for determining the open/closed state of this type of window glass or car door lath, a limit switch is installed near the glass using mechanical action, or a limit switch is installed near the glass, or a magnet and a reed switch are used. It has been considered to install an open/close switch consisting of a windowpane, but this requires a switch to be attached to each window glass, which has the disadvantage of increasing costs and spoiling the aesthetics.

[Object of the Invention] The present invention has been made in view of the above-mentioned problems, and its purpose is to use an inexpensive circuit to determine whether a window is opened or closed without impairing its aesthetic appearance. An object of the present invention is to provide a window opening/closing sensor that can perform the following functions.

[Disclosure of the invention 1 '1
The figure shows one embodiment of the present invention, which consists of a wave transmitting means 11 and a wave receiving means 12. The wave transmitting means 11 of this embodiment includes an oscillator 3' that oscillates a transmission signal, and the oscillator 3'.
It is composed of an amplifier circuit 2 that amplifies the output, and a transmitter 1 consisting of an ultrasonic vibrator that transmits ultrasonic waves at the output of the □amplifier circuit 2. a receiver 4 consisting of an ultrasonic transducer that receives ultrasonic waves and foreign noise; an amplifier circuit 5 that amplifies the signal received by the receiver 4; and an output of the amplifier circuit 5. and sending means 11
a mixer 6 for mixing the output signal of the oscillator 3 with the output signal of the oscillator 3; a detector 7 for detecting Doppler components and foreign noise caused by the movement and shaking of air in a spatial region from the output of the mixer 6; Amplifier circuit 8 that amplifies the output over a wide band
and a comparator 9 that compares the output of the amplifier circuit 8 with a preset level setting value corresponding to the output of the amplifier circuit 8 when the window glass is open, and the output of the comparator 9 is It is comprised of an output drive circuit 10 that drives a display device etc. that displays what has occurred.

The operation of this circuit configured as described above is as follows.

The ultrasonic waves transmitted by the transmitter 1 into a spatial area such as a residential room or a heavy space usually contain thermal noise components such as the amplifier circuit 5.8 if the window glass etc. are in a closed state. This appears at the output of the amplifier circuit 8 as shown in FIG. 2(a). However, if the window glass is open, a Doppler component is generated due to the movement and shaking of the air, and when this Doppler component is received by the receiver 4, the Doppler component is amplified and saturated as shown in Figure 2 (c). become a state. In addition, when a window glass or the like is opened, foreign noise enters the spatial area, and a signal output with a level higher than the thermal noise level as shown in Figure 2 (b) is generated at the output of the amplifier circuit (8). This is because the normal outdoor noise level is at least 40 dBsL, and when the windows are completely closed, the noise level indoors is about 10 dBsL.
This is the difference caused by hearing at a level that is more than dB lower. Therefore, by comparing the output of the detector 7 with the comparator 9, the open/closed state of the window glass etc. can be detected.The output of the comparator 9 allows the output drive circuit 10 to detect when the window glass is open or closed. It generates a signal to drive the display, etc. when the device is in use. In addition, this example is a household security device, HA
It may also be used as a sensor applied to systems and heavy-duty security devices.

[Effects of the Invention] As described above, the present invention includes a wave transmitter that is driven by a wave transmission signal and transmits it into a space/interval area such as inside a vehicle or a house, and a receiver for receiving ultrasonic waves; a mixer for mixing the ultrasonic waves received by the receiver with a signal for transmission from a transmitter; a detector for detecting the output of the mixer; and a detector for detecting the output of the mixer; It is equipped with a comparator that compares the output of the window glass with a predetermined reference value to determine whether the window lath is open or open. Since it is possible to detect Doppler components and foreign noise generated by air movement and i-shares using the wave receiving means, it is possible to detect a switch for each windowpane compared to conventional windowpane opening/closing state detection devices. There is no need to install it, the circuit structure is simple, the cost is low, and the appearance is good.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the circuit configuration of an embodiment of the present invention, and FIG. 12 is an explanatory diagram of the same operation. 1 is a wave transmitter, 2, 5, 8 is an amplifier circuit, 3 is an oscillator, 4 is a wave receiver, 6 is a mixer, 7 is a wave detector, 9 is a comparator, and 10 is an output drive circuit.

Claims (1)

[Claims] (1) A transmitter that is driven by a wave transmission signal and transmits it into a spatial area such as inside a vehicle or a residential room; a receiver that receives the ultrasonic waves transmitted by the transmitter; A mixer that mixes the ultrasonic waves received by the receiver and a signal for transmission from the wave transmitting means, a detector that detects the output of the mixer, and a detector that compares the output of the detector with a predetermined reference value. A window opening/closing sensor includes a comparator that determines whether a window glass is closed or open.