JPS63193621A - Individual selective calling device - Google Patents

Abstract

PURPOSE:To prevent a power supply switch from being carelessly kept at on or off by fitting a pair of electrodes to the contact side with a human body on the back of an enclosure, and closing the power supply switch when the electrodes are connected to each other through the human body. CONSTITUTION:A mounting detecting electrode 2 and a calling signal sensing electrode 3 are provided on the contact side with a human body at the back side of the case 1 of an individually selecting and calling device and a part other than the electrodes 2, 3 is formed as a case conductive part 4. When the device is not mounted on an arm, the input of an inverter 7 is kept at a high level by a resistor 6, an output, i.e. the control voltage of a power supply switch 8 is turned to a low level and the switch 8 is turned off. When the device is mounted on the arm, a human's skin resistor 10 is connected between the electrode 2 and the conductive part 4, the input of the inverter 7 is turned to a low level, its output is turned to a high level and the switch 8 is turned on. Since the power supply switch can be prevented from being carelessly kept at on or off, power consumption can be reduced and a call can be surely transmitted by the electrode 3.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an individual selective calling device such as a pager.

[Prior art] In recent years, the use of individual paging systems has increased, and
With the development of semiconductor technology and small parts, ultra-compact individual selective call devices that are worn on the human body (wristwatch type) and have a single clock function and an individual call function are about to be commercialized. Furthermore, it has become possible to receive not only individual ringing signals but also text messages displayed on liquid crystal display devices.

This type of body-worn individual selection calling device is a device that is placed in close contact with the human body, so it is necessary to apply a light electrical stimulation to the skin without using sound as a means of notifying the reception of a call or text message. It is possible to notify the user of a call, and it is possible to know that there is a call without being noticed by others, or without causing discomfort to others during a meeting, concert, etc.

Incidentally, in order to reduce battery consumption when reception is not required, such as when moving outside the service area of the individual calling system or sleeping, the individual selective calling device is provided with a switch for turning the power on and off.

[Problems to be Solved by the Invention] Conventionally, individual selective calling devices are provided with a manual switch for turning on and off the power. If you forget to turn on the switch when you need to receive calls again after turning off the switch, you will not know if there is a call if you forget to turn on the switch. For this reason, human body-worn devices use ultra-small batteries, so reducing power consumption is an important issue when the device tends to be left on all the time, resulting in significant battery consumption.

SUMMARY OF THE INVENTION An object of the present invention is to provide a human body device type individual selective calling device that eliminates forgetting to turn off or turn on the power switch, has low battery consumption, and can reliably receive calls.

[Means for Solving the Problems] In order to achieve such an object, the present invention includes a pair of electrodes on the back side of the casing that contacts the human body, and a gap between the pair of electrodes that contacts the human body. The feature is that the power switch is configured to close when the device is connected via the power switch.

[Function] In the present invention, the power switch is turned on and off depending on whether or not there is a connection between the pair of electrodes provided on the back side of the housing through the human body, so there is no need to forget to turn on or turn off the power switch, There is little wear and tear on the device, and calls can be reliably received when worn on the human body.

[Embodiments of the invention] Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 shows the structure of an embodiment of the individual selective calling device according to the present invention. On the back side of the case 1 of the wristwatch-type individual selective calling device, there is a detection electrode 2 attached to the side that comes into contact with the human body, and a sensing electrode 2 for sensing the calling signal. Electrodes 3 are provided, and a portion other than the electrodes is used as a case conductive portion 4.

FIG. 2 shows an embodiment of the circuit of the individual selective calling device according to the present invention, in which, in addition to the electrode 2 and case conductive part 4 described above, a battery 5, a resistor 6 of several tens of MΩ, an inverter 7, a power switch (analog switch) CMO8IC consisting of 8
It is equipped with 9.

In the present invention, the power switch 8 is turned on/off depending on the presence or absence of the skin resistance 10 between the attachment detection electrode 2 and the case conductive part 4 connected to the negative side of the battery 5.

In such a configuration, when the device shown in FIG. 1 is not worn on the arm, the input of the inverter 7 is at a high level due to the resistor 6, and the output of the inverter 7, that is, the control voltage of the power switch 8 is at a low level. Therefore, the power switch 8 is turned off.

Next, when the device shown in FIG. 1 is worn on the arm, the skin resistance 10 of the human body enters between the electrode 2 and the conductive part 4,
is several MΩ, which is lower than the resistance 6, so the input of the inverter 7 is at a low level, the output of the inverter 7 is at a high level, and the power switch 8 is turned on.

Note that the call signal sensing electrode 3 is used to notify the user of the call by giving a slight electrical stimulation to the skin when there is a call.

[Effects of the Invention] As described above, according to the present invention, the power switch is turned on and off depending on the presence or absence of skin resistance, so there is no need to forget to turn off or turn on the power switch, reducing power consumption and ensuring that calls are made. can be conveyed to.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an example of the structure of an individual selective calling device according to the present invention, and FIG. 2 is a block diagram of an example of the circuit of the individual selective calling device according to the present invention. DESCRIPTION OF SYMBOLS 1... Case, 2... Mounting detection electrode, 4... Case conductive part, 5... Battery, 6... Resistor, 7... Inverter, 8... Power switch.

Claims (1)

[Claims] Equipped with a pair of electrodes on the back side of the housing, on the side that comes into contact with the human body,
A human body-worn individual selective calling device, characterized in that a power switch is closed when the pair of electrodes are connected through the human body.