Communications: electrical – Condition responsive indicating system – Specific condition
Reexamination Certificate
2000-02-22
2001-12-04
Wu, Daniel J. (Department: 2632)
Communications: electrical
Condition responsive indicating system
Specific condition
C340S539230
Reexamination Certificate
active
06326891
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates generally to a warning device, particularly to a warning device for preventing child from being lost comprising a distance-adjustable high frequency host transceiver and a plurality of associated high frequency slave transceivers, wherein the host transceiver and each slave transceiver can proceed bi-directional page or response with its counterpart.
2. Description of the Prior Art
“Prevention is better than cure” seems applicable by changing it into “Prevention is better than search” in dealing with child's security problem. It is undoubtedly a severe and beyond compensable disaster to a family when a child was lost, and the cloudy family will find no joy in daily living until the child is found back. This is especially true in recent days as a family usually raises only one or two children basing on eugenics concept. On the basis of demand, there are various equipments or devices for preventing child from being lost presented in the market.
One of the devices to be cited has been disclosed in Taiwan with patent No. 300659 (abbrev. as “the patent cited” hereinafter), which is characterized in comprising a host device carried by an adult and a slave device disposed in a personal item or on a child. When the slave device departs from the host device beyond a preset security distance, the latter will alarm to warn the carrier and it can be reset for another alarm when the former reenter the security scope for easy searching. As the patent cited has been developed on the basis of personal items, it is not equally suitable to a child who may go along with his or her parents to different places and under different situations, for example, to a market jammed with people. In case the security range cannot be adjusted within 2 meters, the child may get lost in a winking of an eye. Or, when the family goes out to a park, the security range is still within 2 meters, the mother can only sit aside her child instead of resting on a farther bench.
Moreover, the patent cited is applied on paired basis, namely, one host device to one slave device that will obviously entails more expense on the parents if they have several children.
In view of abovesaid demerits, after years of constant effort in research, the inventor of this invention has consequently developed and proposed an improved warning device pertaining to the subject matter.
SUMMARY OF THE INVENTION
The primary object of this invention is to provide a warning device for preventing child from being lost containing a high frequency host transceiver in which security range is adjustable to fit various circumstantial conditions for monitoring a child's activity.
Another object of this invention is to provide a compact warning device for preventing child from being lost, wherein a high frequency host transceiver is carried by the parents and a high frequency slave transceiver is secured on a child, and the host and the slave transceiver can proceed bi-directional page or response with its counterpart. When the slave transceiver departs from the host transceiver beyond a preset security range, both the host and the slave transceiver will alarm to warn the child and the parents.
Yet another object of this invention is to provide a warning device for preventing child from being lost, wherein a host transceiver can monitor a plurality of slave transceivers simultaneously.
A further object of this invention is to provide a warning device for preventing child from being lost, wherein a slave transceiver is designed lively in configuration to serve as an ornament for a child to wear.
Yet a further object of this invention is to provide a warning device for preventing child from being lost, wherein amount of slave transceiver may be expanded under permission of an encoder module for application in a school or in a traveling group.
For realizing abovesaid objects, the warning device for preventing child from being lost comprising a high frequency host transceiver and a plurality of high frequency slave transceivers. The host transceiver further comprises a single-chip microprocessor, a clock generator, a high frequency transmitter, a high frequency receiver, a distance controller, a warning unit, a power supply controller, a power supply unit, a power voltage detector, a display unit, a high frequency filter, a signal amplifier, and a voltage regulator. The slave transceiver further comprises a single-chip microprocessor, a clock generator, a high frequency transmitter, a high frequency receiver, a warning unit, a power supply controller, a power supply unit, a high frequency filter, a signal amplifier, and a voltage regulator. When the host transceiver send a signal to the slave transceiver, the latter will receive and confirm whether the code carried is correct, then reply to the host if positive, and both the host and the slave keep silent at this time. On the contrary, in case the slave depart from the host beyond a preset security range, both the host and the slave will alarm to remind its user of the abnormal situation.
As to more detailed information regarding this invention together with further advantages or features thereof, at least an example of preferred embodiment will be elucidated below with reference to the annexed drawings.
REFERENCES:
patent: 5646593 (1997-07-01), Hughes et al.
patent: 5841352 (1998-11-01), Prakash
patent: 6127931 (2000-10-01), Mohr
patent: 6150928 (2000-11-01), Murray
patent: 6169485 (2001-01-01), Campana, Jr.
Dougherty & Troxell
Huang Sihong
Wu Daniel J.
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