Telephone receiver having a hollow portion

Details Telephone receiver having a hollow portion Telephone receiver having a hollow portion

1999-08-16

2001-09-11

Chiang, Jack (Department: 2642)

Telephonic communications

Terminal

Housing or housing component

Reexamination Certificate

active

06289101

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a telephone receiver, and especially to a telephone receiver having a hollow portion, by the sound wave passing through the hollow portion and the excitation of the magnet, the amplitude of sound is amplified and a steadier frequency response is achieved.
BACKGROUND OF THE INVENTION
As shown in
FIG. 1
, a conventional telephone receiver is illustrated. The receiver is formed by a body
10
, a yoke
20
, a coil
30
, a vibrating diaphragm
40
, a front cover
50
, and a rear cover
60
. The outer side of the yoke
20
is circularly installed with a magnet
70
. A circular iron piece
80
is attracted at the upper end of the magnet
70
. The bottom of vent hole of the yoke
20
is adhered with a sound adjusting cloth
90
made of non-weaving cloth. In the prior telephone receiver, the body
10
and the rear cover
60
forms with a tightly sealed space so as to be connected to the sound adjusting cloth
90
to form a damp of the vibrating diaphragm. Thus, the prior art receiver may conform to the characteristic of the frequency response of a telephone receiver. However, in the aforesaid prior art telephone receiver, a rear cover
60
is necessary for being formed with a closing space. If the sealing of the closing space is not preferred in assembling, then a preferred frequency response can not be obtained. Whereas the assembly of the rear cover
60
is not convenient and complicated. Moreover, the rear cover
60
will increase the width of the receiver. Where it is used in a mobile phone or a super thin telephone (such as CT2), a bottleneck is induced due to the volume of the receiver can not be further reduced. This is a big problem in the conventional telephone receiver.
A frequency response of a conventional telephone receiver is shown in
FIG. 5
, wherein the effective bandwidth is ranged between 400 Hz~1.5 KHz. Thus the bandwidth is too narrow to generate a clear sound.
SUMMARY OF THE INVENTION
Accordingly, the primary object of the present invention is to provide a hollow telephone receiver comprising a body, a vibrating diaphragm, a coil, a front piece, a magnet, a yoke, a sound adjusting cloth and a terminal plate. The vibrating diaphragm, coil, front piece, magnet, yoke, sound adjusting cloth and the terminal plate are placed into the body sequentially. Thus, the coil winds the cylinder at the lower end of the yoke and is located within the front piece and the magnet. While the upper circular hole at the upper end of the yoke is adhered with the sound adjusting cloth and the terminal plate so that after a hollow telephone receiver is assembled, a hollow portion is formed at the center thereof. Therefore, as a sound is expanded and compressed by the vibration of the vibrating diaphragm. The amplitude of the sound wave will complete concentrate at the hollow portion and is collected at the lower portion of the cylinder of the yoke. Moreover, by the S pole and N pole at the upper and lower ends of the magnet, the magnetic strength is increased effectively so as to enhance the current. Since the sound is amplified by passing through the hollow portion, a steadier audio response is obtained.
The various objects and advantages of the present invention will be more readily understood from the following detailed description when read in conjunction with the appended drawing.


REFERENCES:
patent: 4163875 (1979-08-01), Cogan
patent: 5058154 (1991-10-01), Anderson
patent: 5195142 (1993-03-01), D'Avolio et al.

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