# Patent

## Title
Current transducer and current-monitoring method

## Abstract

A hand held detection device for detecting electromagnetic waves at at least one predetermined frequency has an elongated conductor member having a bottom end portion for grasping by a hand of a user and a top end portion, the elongated conductor is configured to function as an antenna at the predetermined frequency. An LC-resonance circuit is supported on and electrically connected to the top end portion of the elongated conductor and the LC-resonance circuit is tuned for accepting the at least one predetermined frequency. A wave detection circuit is supported at the top end portion of the elongated conductor member. The wave detection circuit includes a rectifier diode for rectifying high-frequency alternating current received in the LC-resonance circuit via the elongated conductor to produce a direct current. The wave detection circuit also includes an indicating means for indicating a presence of a direct current produced by the rectifier diode, the indicating means and the rectifier diode are serially connected to form a series circuit, and the series circuit is connected across the LC-resonance circuit. Optionally, a coil may be substituted for the LC-resonance circuit.

## Background
The present invention relates to a device for detecting electromagnetic waves used for a portable telephone or which are harmful to a human body.

A conventional indicator for a portable telephone is a detector which is able to inform a user visually when the portable telephone is in a calling or receiving condition. Such a detector is composed of first and second rectifier diodes connected to a top end of the portable telephone with alternating ends thereofin the opposite direction, first and second conductive pins connected to the other ends of the rectifier diodes, and a luminous element connected between the first and second conductive pins.

The conventional indicator for portable telephone includes two rectifier diodes such that its structure is complex, and it costs too much. In addition, it is possible to use as the indicator only when the indicator is provided to the top end of the antenna of the portable telephone.

In view of the foregoing, it is an object of this invention to provide a device for detecting electromagnetic waves that has a simple structure, and that detects electromagnetic waves easily so that it is possible to find the sending place of the electromagnetic waves. It is another object of this invention to provide a device for detecting electromagnetic waves that is attached to the antenna attachment housing of the portable telephone and visually informs a user that the portable telephone is in a calling or receiving condition.

The above and further objects and novel features of the invention will more fully appear from the following detailed description when the same is read in connection with the accompanying drawings. It is to be expressly understood, however, that the drawing is for the purpose of illustration only and is not intended as a definition of the limites of the invention.

FIG. 1 is perspective view showing a first embodiment of the present invention in use;

FIG. 2 is a front view showing the first embodiment of the present invention;

FIG. 3 is a schematic circuit diagram showing the first embodiment of the present invention;

FIG. 4 is a front view showing a second embodiment of the present invention;

FIG. 5 is a schematic circuit diagram showing a second embodiment of the present invention;

FIG. 6 is a front view showing a third embodiment of the present invention;

FIG. 7 is a schematic circuit diagram showing the third embodiment of the present invention;

FIG. 8 is a front view showing a fourth embodiment of the present invention;

FIG. 9 is a schematic circuit diagram showing the fourth embodiment of the present invention;

FIG. 10 is perspective view showing a fifth embodiment of the present invention in use;

FIG. 11 is a front view showing the fifth embodiment of the present invention;

FIG. 12 is a schematic circuit diagram showing the fifth embodiment of the present invention;

FIG. 13 is a front view showing a sixth embodiment of the present invention;

FIG. 14 is a schematic circuit diagram showing the sixth embodiment of the present invention;

FIG. 15 is a front view showing a seventh embodiment of the present invention;

FIG. 16 is a schematic circuit diagram showing the seventh embodiment of the present invention;

FIG. 17 is perspective view showing the seventh embodiment of the present invention;

FIG. 18 is a front view showing an eighth embodiment of the present invention;

FIG. 19 is a schematic circuit diagram showing the eighth embodiment of the present invention;

FIG. 20 is a front view showing a ninth embodiment of the present invention;

FIG. 21 is a schematic circuit diagram showing the ninth embodiment of the present invention;

FIG. 22 is a front view showing a tenth embodiment of the present invention;

FIG. 23 is a schematic circuit diagram showing the tenth embodiment of the present invention;

FIG. 24 is a front view showing an eleventh embodiment of the present invention;

FIG. 25 is an expanded sectional view showing the eleventh embodiment of the present invention;

FIG. 26 is a schematic circuit diagram showing the eleventh embodiment of the present invention;

FIG. 27 is a partially exploded view showing the eleventh embodiment of the present invention;

FIG. 28 is a front view showing a twelfth embodiment of the present invention;

FIG. 29 is an expanded sectional view showing the twelfth embodiment of the present invention;

FIG. 30 is a schematic circuit diagram showing the twelfth embodiment of the present invention;

FIG. 31 is a partially exploded view showing the twelfth embodiment of the present invention;

FIG. 32 is a front view showing a thirteenth embodiment of the present invention;

FIG. 33 is a partially exploded sectional view showing the thirteenth embodiment of the present invention;

FIG. 34 is a schematic circuit diagram showing the thirteenth embodiment of the present invention;

FIG. 35 is a front view showing a fourteenth embodiment of the present invention;

FIG. 36 is a partially cross-sectional view showing the fourteenth embodiment of the present invention;

FIG. 37 is a schematic circuit diagram showing the fourteenth embodiment of the present invention; and

FIG. 38 is a partially exploded view showing a fourteenth embodiment of the present invention.

Preferred embodiments of the present invention are described in more detail below referring to the accompanying drawings.

FIGS. 1 to 3 illustrate a device for detecting electromagnetic waves 11 of a first embodiment of the present invention wherein the numeral 1 is a conductor formed in the shape of a rod and able to be held at a back end portion thereof by hand, and the conductor 1 is formed of the same materials as antenna heretofore used. The numeral 2 is an indicator of electromagnetic waves provided to a top end portion of the conductor 1 and further comprises a case body 3 fixedly provided to the top end portion of the conductor 1; an LC-resonance circuit 6, set up as to connect with the conductor in the case body 3, including a capacitor 4 and a coil 5, arranged parallel into the circuit 6 in order to tune a desired frequency. A detecting circuit X of electromagnetic waves further includes a rectifier diode 7, a DC (direct current) indicator 9 as indicating device, and a smoothing capacitor 10.

The rectifier diode 7 is installed within the case body 3, both ends thereof are connected to both ends of the resonance circuit 6, and the rectifier diode 7 can convert a high frequency alternating current generated in the resonance circuit 6 to direct current.

The DC indicator 9 is connected in series with the rectifier diode 7, and has an indicator which is provided within the case body 3 permitting the meter movement to be observed from outside and which moves corresponding to the strength of a DC electric current from the rectifier diode 7. A smoothing condenser 10 is installed within the case body 3 and connected in parallel to the indicator 9 as required.

In the above-mentioned device for detecting electromagnetic waves 11, when a user holds the back end portion of the conductor 1 and points the top end portion of the device 11 at the direction thought to be a sending place for electromagnetic waves, the excitation potential is converted to a direct current by the rectifier diode 7 and flows to the indicator 9 functioning as indicating device so that the excitation potential generates at both ends of the coil 5 of the resonance circuit 6 in proportion to the strength of electromagnetic waves from the sending place when there is a sending place of electric waves in that direction.

As a result, the user can detect electromagnetic waves and find the sending place because the indicator section 8 moves visually by the strength of the DC electric current flowing from the rectifier diode 7.

The movement of the indicator section 8 of the DC indicator 9 changes to slow-moving due to action of the smoothing capacitor 10. Therefore, the user can confirm the detecting of electromagnetic waves easily.

Furthermore, it is easy to convert the frequency detected by the changing the capacity of the capacitor within the resonance circuit 6.

Other embodiments of the present invention will now be described referring to FIGS. 4 to 38. Through the drawings of the embodiments, like components are denoted by like numerals as of the first embodiment and will not be explained.

FIGS. 4 and 5 illustrate a second embodiment of the present invention which is distinguished from the first embodiment by the fact that an amplifier 12 is interposed between the rectifier diode 7 and the DC indicator 9 into the detecting circuit X and is further composed of a widely used transistor field effect transistor (FET), and an integrated circuit (IC). A device for detecting electromagnetic waves 11A having a detector 2A with the amplifier 12 according to the second embodiment has improved sensitivity.

FIGS. 6 and 7 illustrate a third embodiment of the present invention which is distinguished from the first embodiment by the fact that a detector 2B has a coil 5, instead of the LC-resonance circuit, which is able to develop a potential difference therethrough. A device for detecting electroamagnetlc waves 11B is formed in this way according to the third embodiment and provides the same effects as the first embodiment.

FIGS. 8 and 9 illustrate a fourth embodiment of the present invention which is distinguished from the second embodiment by the fact that a detector 2C has a coil 5, instead of the LC-resonance circuit, which is able to develop a potential difference therethrough. A device for detecting electromagnetic waves 11C is formed in this way according to the fourth embodiment and provides the same effects as the second embodiment.

FIGS. 10 to 12 illustrate a fifth embodiment of the present invention which is distinguished from the third embodiment by the fact that a detector 2D has a light emitting diode 13 instead of the DC indicator of the detecting circuit X. In the above mentioned device for detecting electromagnetic waves 11D, the coil 5 has higher level potential in full at the ends thereof so the wave detecting can be done efficiently such that a user can recognize the lighting of the light emitting diode 13 through a transparent body 3a of the upper part of the case body 3A. in a strong magnetic field providing large amounts of current over the spent current of the light emitting diode 13.

FIGS. 13 and 14 illustrate a sixth embodiment of the present invention which is distinguished from the fourth embodiment by the fact that a detector 2E has a light emitting diode 13, as an indicating device, of the detecting circuit X of electromagnetic waves. In the above mentioned device for detecting electromagnetic wave 11E, the wave detecting can be done efficiently so that the light emitting diode 13 is lighted directly in a strong magnetic field providing large amounts of current over the spent current of the light emitting diode 13.

FIGS. 15 and 16 illustrate a seventh embodiment of the present invention which is distinguished from the sixth embodiment by the fact that an attachment 16 is provided at a back end thereof and can be mounted to an antenna attachment 15 on a portable telephone 14. A device for detecting electromagnetic waves 11E can be used as the antenna of the portable telephone 14.

FIGS. 17 to 19 illustrate an eighth embodiment of the present invention which is distinguished from the fifth embodiment by the fact that the wave detecting circuit X includes two wave detectors 2D, 2D connected in series as to be able to light one of light emitting diodes 13, 13A, or both of them, corresponding to the strength of waves in the strong magnetic field. A device for detecting electromagnetic waves 11G formed in this way according to the eighth embodiment can easily detect waves and confirm of the strength of waves. The light emitting diodes 13, 13A are lit in transparent bodies 3a, 3b of upper and lower parts of the case body 3A, corresponding to the strength in the strong magnetic field.

In addition, in this embodiment of the present invention, it is possible to change luminous colors by the strength of the magnetic field, such that a two colored light emitting diode can be used as the light emitting diode.

FIGS. 20 and 21 illustrate a ninth embodiment of the present invention which is distinguished from the sixth embodiment by the fact that a wave detector 2F includes a commercially available automatic flashing type light emitting diode 13B as the indicating device in the wave detecting circuit X. A device for detecting electromagnetic waves 11H formed in this way according to the ninth embodiment improves visual recognition in comparison with the use of an ordinary diode.

FIGS. 22 and 23 illustrate a tenth embodiment of the present invention which is distinguished from the first embodiment by the fact that a wave detector 2G includes a piezoelectric buzzer 17 that is mounted to emit sound from a porous part 18 formed in a case body 3B, instead of the DC indicator of the wave detecting circuit X. A device for detecting electromagnetic waves 11I formed in this way according to the tenth embodiment will provide the same effects as the first embodiment.

FIGS. 24 to 27 illustrate an eleventh embodiment of the present invention which is distinguished from the fifth embodiment by the fact that a wave detector 2B has such a structure that one end of a coil 5A is soldered directly at one of a terminal 13a of the light emitting diode 13. The other terminal 13b of the light emitting diode 13 is soldered directly to a terminal 7a of the rectifier diode 7. The other terminal 7b of the rectifier diode 7 is soldered near the other end of the coil 5A so as to prevent to damage the connection between the light emitting diode 13 and the rectifier diode 7 by the elasticity of the coil 5A. A device for detecting electromagnetic waves 11J formed in this way according to the eleventh embodiment will provide the same effects as the fifth embodiment problems including broken wires during use are prevented.

The other end of the coil 5A is fixedly inserted into a coil support 1c, the coil support 1c having a coil notch support 1b at an outer circumferential portion thereof. A screw thread 1a is formed at a top end of the conductor 1 and screwed into a thread 3b at a lower end of the case body 3A.

FIGS. 28 to 31 illustrate a twelfth embodiment of the present invention which is distinguished from the eleventh embodiment by the fact that the other terminal 7b of the rectifier diode 7 is bent in an arc so as to have an elasticity of coil 5A, the end portion of the terminal 7b is soldered at the coil support 1c. A device for detecting electromagnetic waves 11K formed in this way according to the twelfth embodiment will provide the same effects as the eleventh embodiment.

FIGS. 32 to 34 illustrate a thirteenth embodiment of the present invention which is distinguished from the eleventh embodiment by the fact that a wave detector 2J has a pair of rectifier diodes 7, 7A connected at a top end of the coil 5A at coupled terminal 7b by being soldered directly. The other terminals 7a, 7a thereof being soldered at terminals 13a, 13b of the light emitting diode 13. A device for detecting electromagnetic waves 11L formed in this way according to the thirteenth embodiment will provide the same effects as to the eleventh embodiment.

FIGS. 35 to 38 illustrate an fourteenth embodiment of the present invention which is distinguished from the eleventh embodiment by the fact that a conductor 1 has an attachment 16 at a rear end thereof, the attachment 16 providing to an antenna attachment of the portable telephone, in addition, a capacitive resister 18 is interposed between the conductor 1 and the coil 5A. A device for detecting electromagnetic waves 11M formed in this way according to the fourteenth embodiment can be used as the antenna for the portable telephone.

As set forth above, the advantages of the present invention are as follows:

(1) A device for detecting electromagnetic waves according to the present invention comprises: a conductor; a resonance circuit connected with a top end portion of the conductor, the LC-resonance circuit being tuned to a desirable frequency, and a detection circuit further comprising a rectifier diode which is connected to both ends of the LC-resonance circuit and which converts a high-frequency alternating current from the LC resonance circuit to direct current, and indicating means including an indication meter, a lighting, a flashing, or a buzzer connected in series with the rectifier diode, the indicating means providing indication corresponding to the strength of DC electric current so that when electromagnetic waves are detected, high frequency drives the LC-resonance circuit and is converted to direct current by the rectifier diode, the strength of direct current from the rectifier diode allows the indicating section of the DC indicator to work or the light emitting diode to light. The user can understand the wave detecting condition and the user can locate the origin of a sending place.

(2) As apparent from the description of the paragraph (1), it is possible to manufacture it easily and at lower cost relatively because the structure is simple.

(3) As apparent from the description of the paragraph (1), everybody can detect easily electromagnetic waves such as waves which would be harmful to a human body because it is possible to detect electromagnetic waves when the top end of the conductor is driven to the direction of the sending place of electromagnetic waves.

## Claims

1. A hand held detection device for detecting electromagnetic waves at at least one predetermined frequency, comprising: grasping by a hand of a user and a top end portion, said elongated conductor antenna being configured to function as an antenna at said at least one predetermined frequency; antenna, said casing housing: end portion of said elongated conductor antenna, said LC-resonance circuit being tuned for accepting said at least one predetermined frequency; and elongated conductor antenna, said wave detection circuit including: received in said LC-resonance circuit via said elongated conductor antenna to produce a direct current; and by said rectifier diode, said indicating means and said rectifier diode being serially connected to forrn a series circuit, said series circuit being connected across said LC-resonance circuit.

2. The hand held detection device according to claim 1, wherein said indicating means is a DC indication meter having an indicating member which moves corresponding to a strength of said direct current produced by said rectifier diode.

3. The hand held detection device according to claim 1, wherein said indicating means is a light emitting diode which lights corresponding to a strength of said direct current produced by said rectifier diode.

4. The hand held detection device according to claim 1, wherein said indicating means is a piezoelectric buzzer which produces sound corresponding to a strength of said direct current produced by said rectifier diode.

5. The hand held detection device according to claim 1, wherein said elongated conductor antenna is a rod.

6. The hand held detection device according to claim 1, in combination with a wireless phone wherein said wireless phone has an antenna input and said elongated conductor antenna has said bottom end portion connected to said antenna input of said portable telephone to provide a signal thereto.

7. The hand held detection device according to claim 1, wherein said wave detection circuit includes a smoothing capacitor which is connected in parallel to said indicating means.

8. The hand held detection device according to claim 1, wherein said wave detection circuit includes an amplifier connected in series to said rectifier diode.

9. A hand held detection device for detecting electromagnetic waves at at least one predetermined frequency, comprising: grasping by a hand of a user and a top end portion, said elongated conductor antenna being configured to function as an antenna at said at least one predetermined frequency; antenna, said casing housing: across said coil due to electromagnetic waves received via said elongated conductor antenna; and elongated conductor antenna, said wave detection circuit including: received in said coil via said elongated conductor antenna to produce a direct current; and by said rectifier diode, said indicating means and said rectifier diode being serially connected to form a series circuit, said series circuit being connected across said coil.

10. The hand held detection device according to claim 9, wherein said coil is directly connected to said rectifier diode so as to provide elastic support for said rectifier diode.

11. A method for detecting electromagnetic waves at at least one predetermined frequency, comprising the steps of: for grasping by a hand of a user and a top end portion, said elongated conductor antenna being configured to function as an antenna at said at least one predetermined frequency; elongated conductor antenna a coil tuned for accepting said at least one predetermined frequency; portion of said elongated conductor antenna, said wave detection circuit including: received in said coil via said elongated conductor antenna to produce a direct current; and by said rectifier diode, said indicating means and said rectifier diode being connected across said coil; said top end portion of said elongated conductor antenna; and antenna and directionally orienting said elongated conductor antenna in an electromagnetic field such that said indicating means indicates current is produced by said rectifier diode thus signifying presence of an electromagnetic field.

12. The method according to claim 11, further including the step of providing a capacitor connected in parallel to said coil to form a LC-resonance circuit tuned for accepting said at least one predetermined frequency.

13. The method according to claim 11, wherein said coil is directly connected to said rectifier diode so as to provide elastic support for said rectifier diode.

14. The method according to claim 11, wherein said indicating means is a DC indication meter having an indicating member which moves corresponding to a strength of said direct current produced by said rectifier diode.

15. The method according to claim 11, wherein said indicating means is a light emitting diode which lights corresponding to a strength of said direct current produced by said rectifier diode.

16. The method according to claim 11, wherein said indicating means is a piezoelectric buzzer which produces sound corresponding to a strength of said direct current produced by said rectifier diode.

17. The method according to claim 11, wherein said elongated conductor antenna is a rod.

18. The method according to claim 11, in combination with a wireless phone wherein said wireless phone has an antenna input and said elongated conductor antenna has said bottom end portion connected to said antenna input of said portable telephone to provide a signal thereto.

19. The method according to claim 11, wherein said wave detection circuit includes a smoothing capacitor which is connected in parallel to said indicating means.

20. The method according to claim 11, wherein said wave detection circuit includes an amplifier connected in series to said rectfier diode.