Communications: radio wave antennas – Antennas – Combined with diverse-type art device
Reexamination Certificate
2000-12-20
2001-09-18
Phan, Tho G (Department: 2821)
Communications: radio wave antennas
Antennas
Combined with diverse-type art device
C343S702000, C343S872000
Reexamination Certificate
active
06292151
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to an antenna for mobile phone, and more particularly to an antenna for mobile phone that uses a printed circuit to replace the conventional coil antenna, so that the antenna is manufactured at reduced cost and provides increased frequency stability.
With the increasingly grown technology nowaday, mobile phones have not only largely reduced dimensions but also changeful appearances. However, most mobile phones have an antenna that is almost unchanged—a black, thick and short bar projected from a top of the mobile phone and having simple functions of receiving and transmitting signals. There are manufacturers developing some antennas for mobile phone that are able to emit lights, in addition to receive and transmit signals, enabling users to know current conditions of their mobile phones through not only sound and vibration, but also light.
FIG. 7
is an exploded perspective showing the structure of a conventional antenna
1
for mobile phone. The antenna
1
mainly includes a clear hood
11
, an antenna
12
, a light-emitting element
13
, a separating plate
14
, an insulating member
15
, a signal needle
16
, a coiled member
17
, and a base
18
. The separating plate
14
is fixedly connected to a top of the signal needle
16
for setting in the coiled member
17
. The separating plate
14
prevents the antenna
12
from contacting with the coiled member
17
and thereby protects the antenna
12
against short circuit that would cause failure of the antenna
12
in receiving and transmitting signals. An upper side of the separating plate
14
is electrically conductive for a lower end of the antenna
12
and a first pin of the light-emitting element
13
to fixedly weld thereto. The base
18
is in the form of a funnel and is provided with an axially extended through hole
181
. The through hole
181
is provided on an inner peripheral wall with an insulting layer to prevent the signal needle
16
located in the through hole from unexpected contacting with the base
18
to result in short circuit and failure in receiving and transmitting signals. The insulting member
15
is a cylindrical member connected to and around the signal needle
16
, such that the insulting member
15
is set in an upper end of the through hole
181
. A second pin of the light-emitting element
13
is welded to a top of the coiled member
17
. The base
18
has an externally threaded portion for the base
18
to screw onto a top of a mobile phone and contact with a negative electrode of a power supply in the mobile phone. Finally, the clear hood
11
is closed onto the base
18
to enclose the antenna
12
.
The above-described conventional antenna for mobile phone has complicate components that could not be easily assembled together, and therefore requires increased manufacturing cost and selling price. The above-described conventional antenna for mobile phone also has the following drawbacks:
1. The high number of complicate components tends to result in errors in assembling the antenna to adversely affect the quality of received signals.
2. In the conventional antenna that also emits lights, a voltage signal at the output of the antenna has a maximum value equal to a peak value Vm thereof, and only limited number of light-emitting elements (loads) at the output can be driven by the output voltage to emit lights.
In view of the drawbacks existing in the conventional antenna for mobile phone, it is tried by the inventor to develop an improved antenna for mobile phone to eliminate such drawbacks.
SUMMARY OF THE INVENTION
A primary object of the present invention is to provide an antenna for mobile phone that uses a printed circuit to replace the conventional coil antenna, so as to reduce the manufacturing cost of the antenna and increase the frequency stability thereof.
Another object of the present invention is to provide an antenna for mobile phone that includes at least one light-emitting element for emitting lights as an indicator of receiving signals.
To achieve the above and other objects, the antenna for mobile phone according to the present invention mainly includes a low-profile multi-layered circuit board mounted on a base and protectively covered with a light-transmissible hood fitted around the base. The low-profile multi-layered circuit board is provided at a reverse side with a printed antenna and at a front side with a half-wave voltage-doubling circuit and a light-emitting element. A power input of the half-wave voltage-doubling circuit is replaced with a printed inductance for inducing an alternating voltage and generating a resonance to eliminate a capacitive reactance in a diode included in the circuit. The diode rectifies the induced alternating voltage to a direct voltage for driving the light-emitting element to emit lights. When additional n diodes and n capacitances are parallelly connected to the half-wave voltage-doubling circuit, a half-wave voltage-multiplying circuit is constituted, so that an amplified output voltage (n+1)Vm times as large as a received voltage signal can be obtained to drive multiple light-emitting elements connected to the output of the circuit to emit lights.
REFERENCES:
patent: 3900725 (1975-08-01), Komon
patent: 4039894 (1977-08-01), Gardner
patent: 4989013 (1991-01-01), Smith et al.
patent: 5278556 (1994-01-01), Oh
patent: 5448456 (1995-09-01), Huynh
patent: 5933081 (1999-08-01), Jones
patent: 6130646 (2000-10-01), Jang
Birch & Stewart Kolasch & Birch, LLP
Phan Tho G
Senton Enterprise Co., Ltd.
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