JP2960245B2 - Alarm device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an alarm device for detecting a body movement state of a person on a seat or bedding and generating an alarm, for example, to prevent a heat stroke accident of an infant in a vehicle compartment in summer. Used to prevent.

[0002]

2. Description of the Related Art Conventionally, the only thing to prevent a heat stroke accident of an infant in a vehicle cabin in summer is to attach a sunshade to a window in the car. There was no alarm device that detected the condition and generated an alarm. As an alarm device for detecting a person's body movement on a seat or bedding to prevent falling asleep, for example, as shown in FIG. 3 is provided, and the warning means 4 is driven by the amount of light received by the photosensitive element 3. With this configuration,
If the person falls asleep and falls down, the light from the desk lamp 1 is reflected from the desk surface and the amount of light received by the photosensitive element 3 is reduced. When the amount of light received is reduced, the timer 5 is activated, and the amount of received light is reduced. Is reduced for a certain period of time, an alarm is issued from the alarm means 4.
(Japanese Utility Model Publication No. 46-16795)

[0003]

However, in the alarm device of the above-described technology, when an object is placed under the desk lamp 1, the alarm from the desk lamp 1 is performed in the same manner as when falling asleep after falling asleep. When the amount of light received by the light-sensitive element 3 decreases, the timer 5 operates. When the amount of received light decreases for a certain period of time, an alarm is issued from the alarm means 4. In addition to the occurrence of a malfunction such as the occurrence of a malfunction, there is a problem that skill is required to adjust the sensitivity of the photosensitive element 3 to eliminate the malfunction.

[0004] An object of the present invention is to detect the presence of a person on a seat or bedding while distinguishing between a person and an object and to detect a room temperature in order to prevent a heat stroke accident of an infant in a vehicle cabin in summer.
It is an object of the present invention to provide an alarm device for issuing an alarm based on the presence or absence of a person and the room temperature .

[0005]

In order to achieve the above object , the present invention provides a piezoelectric element provided on a seat or bedding, and a filter for filtering a specific frequency component of an output signal of the piezoelectric element. Amplifying means for amplifying the output signal of the filter, smoothing means for smoothing the output signal of the amplifying means, and comparing means for comparing the output signal of the smoothing means with a predetermined set value, A timer controlled based on an output signal of the comparing means, an alarm means for generating an alarm, a room temperature detecting means for detecting a room temperature,
And control means for controlling the alarm means based on the output signal of the room temperature detecting means .

[0006]

The present invention operates as follows by the above configuration. When a human body is seated, a piezoelectric element disposed on a seat or bedding is deformed by body movement of the human body, and a voltage is generated by a piezoelectric effect. A specific frequency component of the output signal of the piezoelectric element is filtered by the filter, amplified by the amplifying means, and smoothed by the smoothing means. The output signal of the smoothing means is compared with a predetermined set value by the comparing means, a timer is controlled based on the output signal of the comparing means, and the room temperature is detected by the room temperature detecting means ,
Based on the output signals of the timer and the room temperature detecting means
Alarm means are controlled.

[0007]

First, a reference example of the present invention will be described with reference to the accompanying drawings. This reference example is a case in which it is installed in a vehicle. FIG. 1 is a block diagram of the present reference example , 6 is a piezoelectric element,
7 is a filter, 8 is an amplifying means, 9 is a smoothing means, 10
Is a comparing means, 11 is a timer, 12 is an alarm means, a horn of the car, and 13 is a control means. The piezoelectric element 6 is formed of a polymer piezoelectric material such as polyvinylidene fluoride (PVDF) in the form of a thin film, and a flexible electrode film is adhered to both surfaces thereof and formed into a tape shape. I have.

The operation of the configuration of the above-mentioned reference example will be described below. When the human body is seated, the piezoelectric element 6 disposed on the seat 14 is deformed by the body movement of the human body, and a voltage is generated by the piezoelectric effect. A specific frequency component of the output signal of the piezoelectric element 6 is filtered by the filter 7, amplified by the amplifier 8, and smoothed by the smoother 9. FIG. 2 shows an output signal waveform of the smoothing means 9 at the time of actual sitting. As shown in FIG. 2, in the case of a coarse body movement such as sitting, limb movement, or unseating, the movement is over the whole body, so that the piezoelectric element 6 undergoes a large deformation and a large signal waveform is output from the smoothing means 9. When you are in a resting state, the body moves slightly due to the heart's heart activity and respiratory activity.
A relatively low level output like the S section of FIG. Also,
When an object is placed on the seat as shown in FIG. 2, a large output is obtained immediately after the object is placed, but since the object does not have the heart activity and respiratory activity as described above, the output as shown by S in FIG. Is not. Based on such an output signal, the comparing means 10 compares the output V from the smoothing means 9 with a predetermined set value Va. If V ≧ Va, the timer 11 starts counting time. If V <Va, the timer 11 is reset. In the control means 13, the timer 11
If the time measured by the timer continues for a certain period or more, the alarm unit 12 is driven to generate an alarm.

As described above, the presence of a person is detected by minute body movements caused by the heart activity or respiratory activity of the human body detected by the piezoelectric element , and an alarm is generated when the person has been present for a certain period of time or more. Ru is. In addition , since the presence of the person is determined by reliably distinguishing the person and the object, the alarm is not malfunctioned because the person and the object cannot be distinguished from each other as in the related art .

In the above-mentioned reference example, as shown in FIG. 3, the control means 13 may have a signal transmission section 15 and the portable alarm means 16 may be driven wirelessly . Here, the alarm means 16 is configured to be integrated with, for example, a car key 17. With this configuration, when the time measured by the timer 11 continues for a certain period of time or more, the control unit 13 generates a radio signal from the signal transmission unit 15, and the portable alarm unit 16 receives the signal and generates an alarm. This
For example , if the parent leaves the car while the infant is left in the car, in the above reference example, the horn will sound after a certain period of time , but if there are no people around including the parent that there is a problem that not even notice sounding horns, so to drive the warning means of the portable in the present reference example wirelessly, to be sure the parent by the warning notice to the risk of infant in
Wear. In addition, when used for preventing drowsiness, it is possible to notice drowsiness even when the user is away from the home, thereby improving usability.

An embodiment of the present invention will be described based on the above reference examples.
This will be described below. This embodiment is different from the above reference example
, The present embodiment as shown in FIG. 4 has a room temperature detecting means 18 for detecting the vehicle room, the control unit 13 controls <br/> the alarm means on the basis of the output signal of the timer 11 and the room temperature detecting means 18 On the point.

With the above configuration, this embodiment operates as follows. That is, when the time measured by the timer 11 continues for a certain period of time or more, the control unit 13 drives the alarm unit 12 only when the room temperature detected by the room temperature detecting unit 18 becomes higher than the certain temperature.

According to the above- described operation, in the above-described reference example , when the time measured by the timer 11 continues for a certain period of time or more, the alarm unit 12 is driven. Therefore, an alarm is issued despite the high temperature inside the vehicle and no heat stroke. Although there was a problem of sounding, in the present embodiment, there is an effect that fine-grained control such as controlling the driving of an alarm based on the room temperature inside the vehicle can be performed, thereby improving usability.

[0014] The above embodiment has been described as an example to prevent in advance the heat stroke accident infants in the passenger compartment in summer, applications of the present invention is not limited to the vehicle, for example, infant Ya It can be applied to prevention of accidents in general households such as bedridden persons and handicapped persons.

[0015]

As described above, according to the alarm device of the present invention, the following effects can be obtained.

That is, the human body and the object are caused by minute body movements caused by the heart activity and respiratory activity of the human body detected by the piezoelectric element.
The detecting the presence of a person to distinguish reliably, there continues a predetermined time or more with a person, and is detected by the room temperature detecting means
Since the alarm is generated only when the room temperature becomes equal to or higher than a certain temperature, there is an effect that it is possible to prevent a heat stroke accident of an infant in a vehicle compartment in summer, for example.

[Brief description of the drawings]

FIG. 1 is a block diagram of an alarm device according to a reference example of the present invention.

FIG. 2 is a waveform diagram of an output signal of a smoothing means in the reference example .

FIG. 3 is a block diagram in the reference example .

FIG. 4 is a block diagram according to an embodiment of the present invention .

FIG. 5 is a perspective view of an example of a conventional alarm device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Desk lamp 2 Prop 3 Light sensitive element 4 Alarm means 5 Timer 6 Piezoelectric element 7 Filter 8 Amplification means 9 Smoothing means 10 Comparison means 11 Timer 12 Alarm means 13 Control means 14 Seat

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) A61B 5/11 A61B 5/00

Claims (1)

(57) [Claims] 1. A piezoelectric element disposed on a seat or bedding, a filter for filtering a specific frequency component of an output signal of the piezoelectric element, amplification means for amplifying an output signal of the filter, and the amplification means A smoothing means for smoothing the output signal of the means, a comparing means for comparing the output signal of the smoothing means with a predetermined set value, a timer controlled based on the output signal of the comparing means, an alarm, Alarm means for generating an alarm, a room temperature detecting means for detecting a room temperature, and the timer
And a control means for controlling the warning means based on an output signal of the room temperature detection means .