Note : Les descriptions sont présentées dans la langue officielle dans laquelle elles ont été soumises.
CA 02281539 1999-08-19
SPECIFICATION
DEVICE FOR DETECTING ELECTROMAGNETIC G~IAVES
Field of Art
The present invention relates to an antenna or a device for detecting
electromagnetic waves used to be installed with equipment such as a portable
telephone, a telecommunication apparatus aid the like.
Background
Signal transmitting-receiving apparatus has now been widely used
in various applications such as portable telephone, but entrains a drawback
that it is not always to communicate with high accuracy in the case of
bad receiving condition or low sensitivity, due to the geographical
conditions of a location. In particular, due to the structure that the
antenna is retracted in a body of the receiver upon non-use, the receiving
condition will become worse.
Japanese non-examined patent publication No. Hei 10-197581, which
is known as to improve the receiving sensitivity and to visualize the
detected wave, discloses a device which senses a high frequency alternating
current generated bin LC resonance circuit from an electromagnetic wave,
energize a light emitting diode by a direct current rectified by a
rectifying circuit to indicate a stronger wav~ intensity direction of the
wave to a user, thereby to make possible to direct the antenna to a suitable
direction.
However, such a prior art antenna causes the device to have a
complicated circuit structure and high costs . nlso, the prior art antenna
does not have a function to discriminate a device himself from the other.
It is an object of the present invention to provide a device for
detecting electromagnetic~waves to solve the above-mentioned problems,
having a high sensitivity, detecting the direction of the emitting source
of the wave, and discriminating the device being installed.
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CA 02281539 1999-08-19
Description of the Invention
The device for detecting electromagnetic waves comprises an antenna
body in the form of a rod of electrically conductive material, a head member
removably attached a top end of the antenna body, and a supporting member
inserted therein and expansibly and contractibly supporting the antenna
body.
The head mem~2r encloses therein a serial resonance circuit, thereby
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enabling to increase the receiving sensitivity.
The serial resonance circuit comprises a capacitive resistor and
a coil, or a serial resonance circuit comprising a capacitive resistor
and metal washer fitted to the upper portion of the resistor to select
the wave having a desired frequency, thereby achieving reduction in costs .
Alternatively, the resonance circuit comprises a rod element
extending from the capacitive resistor and the coil covering the rod element
to form a parallel resonance circuit, or a rod element and a metal pipe
selecting the objective frequency to form a parallel resonance circuit,
thereby achieving reduction in costs and a high sensitivity.
In order to select a wave having desired frequency, one or two
smoothing capacitors are connected at the middle portion of the element
and to the upper end of the coil to form a serial resonance circuit, thereby
to achieving a high sensitivity. i
Furthermore, the resonance circuit may comprise a light emitting
aerial resonance circuit to form an indicating member which comprises the
resonance circuit may comprise a detector diode positioned at the central
portion of the element extending from the capacitive resistor in series,
a light emitting diode connected between the upper end portion of the coil
and the upper portion of the element, thereby to form a an indicating member
consisting of a light emitting series resonance circuit. In such
construction, it is possible to indicate receiving a wave by light emission
of the indicating member.
The head member, Which include a built-in resonance circuit, may
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comprise a connecting member formed of a conductor and a cap portion.
In addition, the upper portion or whole portion of thQ cap member
may be formed of a transparent or translucent insulator material, thereby
enabling the indicating member or the discrimination member to be visible
from the outside, Alternatively, when at least part of the cap member is
Loaned by a opaque insulating material having any desired color or pattern,
it provide a capability of discrimination between itself and others,
The connecting member of the antenna may have a scr~w at the outer
periphery, to which the cap member is screw,~d for fitting together, and
a screwed penetrating hole at the center of the connecting member in the
axial direction, by which the connecting member can be connected to the
connecting member of the antenna member. Such construction makes possible
to select one of various combinations of the cap members and the antenna
members.
The antenna member may comprise a connecting member to be connected
to thee head member at the upper end portion in its longitudinal direction,
and a restricting member for preventing removal from the supporting member.
Furthermore, in order to improve the receiving sensitivity, the
antenna body may be formed from telescopically expansible and contractible
multiple pipes having the maximum length longer than its minimum length.
The antenna having the above-mentioned construction can be attached
by removing the al~qady attached antenna from a portable telephone, for
example, and by attaching in a manner that the supporting member of tha
antenna of the present invention is fitted to the portable telephone in
place, thereby exhibiting functions of improvement of receiving
sensitivity, sensing the direction of the~emitting waves, indication of
the receiving and discrimination between itself and others.
Brief Description of the Drawings
Fig. 1 is a front view of a first embodiment of the present invention;
Fig. 2 is a sectional view of a head member of the first embodiment
of the present invention;
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Eig. 3 shows an exploded front view of the first embodiment of the
present invention;
Fig. 9 is a circuit diagram of the first embodiment of the present
invention:
Fig. 5 shows an exploded front view and a circuit diagram of a second
embodiment of the present invention;
Eig. 6 shows an exploded front view of a third embodiment of the
present invention;
Fig. 7 shows an exploded front view of a fourth embodiment of the
present invention;
Fig. 8 shows an exploded front view of a fifth embodiment of the
present invention;
Fig. 9 shows an exploded front view and a circuit diagram of a sixth
embodiment of the present ~.avention;
Fig. 10 shows an exploded front view of a seventh embodiment of
the present invention;
Fig . 11 is a sectional view of a head member of the seventh embodiment
of thQ present invention:
Fig. 12 is a front view of the applied embodiment of the antenna
of the present invention;
Fig. 13 Shows an exploded front view of a eighth embodiment of the
present invention;
Fig. 14 sh~s a front view of a supporting member of the eighth
i
embodiment of the present invention;
Fig. 15 shows a front view of a ninth embodiment of the present
invention;
Fig. I6 shows a front view of a tenth embodiment of the present
invention;
Fig. 17 is a sectional view of a connecting member of the antenna
of the applied embodiment of the present invention: and
Fig. 18 is a view showing a form of use of a first embodiment of
the present invention.
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The Best Mode for Embodying the Present Invention
(First Embodiment)
An antenna A embodying the present invention of the present
invention comprises, as shown in Fig. 1, an antenna body 1 in the form
of a rod made of a conductive material, a head member 2 detachably fitted
to zhe upper end portion of the antenna body 1, and a supporting member
3 inserted Lhrough the antenna body 1 for supporting it.
The head member 2 comprises, as illustrated in Fig. 2, a built-in
resonance circuit 20a which receives a wave to generate a high frequency
alternating current for indication. The upper part of the head member 2
is covered with a transparent or translucent cap member 210. At the lower
part of the cap member 210 is provided a connecting member 220 fitted by
screwing.
As shown in Fig. 3, the resonance circuit 20a comprises a capacitive
resistor 201 press fitted to the antenna connecting member 220, a coil
202 snap fitted to a projection formed at the upper portion of the capacitivc
resistor 201, an clement 203 disposed inside of the coil 202 at the central
portion thereof. a detecting diode 209 disposed in the coil 202 and
connected in series with the coil 202, and a light emitting diode 205
connected between an end of the coil 202 and an end of the element 203
in series with the detecting diode 204 (see Fig. 3).
Fig. 4 illustrates a circuit diagram showing the light emitting
series resonance ci~'cuit, wherein a high frgquency alternating current
generated in the coil 202 is rectified by the detecting diode 204, and
then supplied to the light emitting diodo 205 to light it, thereby
performing a function of indication at the indicating member 230.
As shown in Fig. 12, the antenna body 1 is provided with a connecting
member 11 having threads llm for connecting it to the upper end portion
of Che head member 2 by screwing. At the lower end portion of the antenna
body 1 has a restricting member 12 for preventing removal of the antenna
body 1 from the supporting member 3.
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The antenna haring the above-mentioned construction can be attached
to a portable telephone as shown in Fig. 18, for example, by removing the
existing antenna and attaching in place thereof by screwing the supporting
member 3 to an antenna fitting portion, thereby enabling increase in its
receiving sensitivity and adjustment of the direction for a better
receiving condition corresponding to the directivity of the
electromagnetic waves by the aid of the intensity of the light emitted
from the indicating member 230.
Referring now to a different embodiments with reference to Figs.
5 to 10 in which different head members 2 are used, and to Figs. 13 to
16 in which diffe~gnt antenna bodies 1 are used. These different head
members 2 and different antenna bodies 1 can be used in any desired
combination by attaching them by screwing the connecting member 11 of the
antenna body 1 with the antenna connecting member 220 of the head member
2.
(Second Embodimen~)
As illustrated in Fig. 5, the antenna of this embodiment comprises
a series resonance circuit 20b press fitted to an antenna connecting member
220 and an discrimination member 207 made of insulating material having
a desired color or pattern are enclosed within a transparent or translucent
cap member 210.
The series resonance circuit 20b has a simple construction
consisting of the capacitive resistor 201 and the coil 202 secured to the
projection of the upper portion of the resistor 202, but the same function
and effect as in the first embodiment can be~btained, and it is possible
to discriminate itself from the other antenna or the device having other
antenna by means of the indicating member 207.
(Third Embodiment)
In the third embodiment shown in Fig. 6, different from the second
embodiment, a metal washer 206 is fitted to the projection of the capacitive
resistor 201. By this, a series resonance circuit 20c is formed which can
perform adjustment to a desired wave, and it is possible to obtain the
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~-a
same function and effect as in the second embodiment.
(Fourth Embodiment)
In the fourth embodiment shown in Fig. 7, there are provided a
rod-shaped element extending from the capacitive xesistor 201, and a coil
202 covering the outer periphery of the element 203 and fitted to th~
capacitive resistor 201 co form a parallel resonance circuit 20d, thereby
and it is possible to obtain the same function and effect as in the second
and third embodiments.
(Fifth Embodiment)
The fifth embodiment illustrated in Fig. d is different from th~
above fourth embodiment in that there is provided a metal pipe 208 which
penetrates through~'the element 203 for sele iting a wave having a desired
frequency. The metal pipe 208, within which the element 203 is inserted,
is positioned within the coil 202. zn this embodiment, a parallel
resonance circuit 20a is formed by using such construction as above, dnd
the antenna presents same function and effect as in the second, third and
fourth embodiments.
(Sixth Embodiment)
The sixth embodiment illustrated in Fig. 9 (a) comprises a capacitor
209 serially connected to the rod-shaped element 203 which is extending
from the capacitive resistor 201.. The capacitor 209 is so provided as to
cover the outer periphery of the element 203, and constitute a series
resonance circuit 20f together with a coil 202 attached to the projection
of the capacitive resistor 201. The circuit diagram is shown in Fig. 9 (b) .
In this embo.~ment, it is possible not only to adjust to a desired
frequency by the function of the capacitor 209, but also to obtain same
function and effect as in the sQCOnd to fifth embodiments.
(Seventh Embodiment)
The sixth embodiment illustrated in Figs. 10 and 11 comprises an
opaque cap 210a, having any desired color or pattern, at the head portion
for enabling the antenna to be discriminated from others by applying. In
Eig. 11 is illustrated an example in which the resonance circuit 20b is
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CA 02281539 1999-08-19
built-in as described in the second embodiment, but it is possible to
enclose any one of the resonance circuit 20c. 20d, 20e and 20f as described
in the third, fourth, fifth and sixth embodiments, respectively.
(Eighth 8mbodiment)
Referring now to an antenna body 1 embodying another embodiment
of the present invention With reference to the drawings, in the eighth
embodiment shown in Fig. 13, an antenna body lb is formed of multiple pipes
13a, 13b, 13c and 13d having different diameters from each other and
arranged coaxial7.y in a manner to be expansible and contractible, thereby
improving receiving sensitivity by expanding upon use. A supporting
member 31 is fitted at the lower end portion of the antenna body lb. As
shown in Fig. 14, t~, a supporting member 31 is attached to the antenna body
lb by screwing the lowest pipe 13a having the largest diameter.
(Ninth Embodiment)
In the ninth embodiment illustrated in Fig. 15, the antenna body
lb in the above eighth embodiment is so modified that a shaft 33 is provided
on the upper portion of a supporting member 32, and a pipe 14e positioned
at the lowest and having largest diameter is connected to the shaft 33.
In this embodiment, it is possible to fold the antenna lc.
(Tenth. Embodiment)
The tenth embodiment shown in Fig. 16 comprises two antenna bodies
1 at upper and lower portions, respectively, with the upper antenna body
and the lower antenna body being mutually connect through an intermQdiate
connecting member 14. Therefore, the entire length of the antenna body
1d is extended, thereby to improve its receiving sensitivity more easily.
In addition the present invention isralso possible to provide a
sufficient sensitivity and discrimination ability as desired by a user,
by using any desired combination of one of the antennas lb, le and ld of
the eighth, ninth and tenth embodiments and one of head members 2 mentioned
in the first through seventh embodiments.
Furthermore, as shown in Fig. 17 (a) , it is also preferable to connect
by screwing the connecting member 11 of the antenna body 1 to an antenna
a
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CA 02281539 1999-08-19
connecting member 220 provided at the lower portion of the head member
2, or to form integrally an antenna connecting member 220a and the antenna
1.
Possibility of utilization in Industry
As has beem~described above, the antenna of the present invention
has a high receiving sensitivity, so that it is possible to prravent
occurrence of inconvenient condition such as impossible state for
receiving. In addition, due to the ability of sensing the direction of
a wave emitting source, it is possible to receive a wave at a best condition
even at the bad geographic location or in the shade of a building.
Furthermore, the head member is formed to be replaceable, the user
can select a suitable combination according to a desired sensitivity or
a performance. In addition, the antenna of the present invention can be
attached in replace of the already existing antenna, thereby easily
confirming whethsr the telephone belongs to the user or not.
'~'a
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