Acoustics – Diaphragm – With direct mechanical connection to drive unit
Reexamination Certificate
2000-12-28
2002-11-05
Dang, Khanh (Department: 2837)
Acoustics
Diaphragm
With direct mechanical connection to drive unit
C181S171000, C381S423000
Reexamination Certificate
active
06474440
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a diaphragm for a speaker, endurance against input of which is improved, particularly suitable for an on vehicle use and to a speaker device provided with the diaphragm.
2. Description of the Related Art
A cone speaker is most widely used among many types of speaker and used for a variety of purposes such as a television set, radio, on-vehicle system and hi-fi system.
FIG. 4
illustrates a basic structure of a conventional cone speaker, in which the central part is supported by a damper
44
and the peripheral part is supported by a frame
46
through an edge
45
. Since the edge
45
functions as a spring to return a back-and-forth movement of the cone-type diaphragm
42
, it is designed so as not to disturb an oscillation of the diaphragm. A voice coil
41
, which is inserted in a magnetic gap of a magnetic circuit constituted by a magnet, plate and yoke, is applied with a current to oscillate the cone-type diaphragm
42
, thereby generating a sound.
A neck of the cone-type diaphragm
42
is connected to the voice coil
41
by using an adhesive
43
. Consequently, in response to a drive of the voice coil
41
, a force in a direction of peeling the adhesive
43
off is always applied, causing a problem of endurance against input when a large volume is outputted from an amplifier (not shown in the figure). In some case, the adhesive is deteriorated to peel off, causing the diaphragm not to function.
Moreover, with use for a long period of time, the adhesive strength at the neck of the cone-type diaphragm
42
deteriorates, therefore the resonance sharpness of the crossover oscillation of the cone-type diaphragm
42
increases generating sharp maximum and minimum in the frequency characteristic, causing a disadvantage for obtaining a flat frequency characteristic in terms of audibility.
SUMMARY OF THE INVENTION
It is therefore an objective of the present invention to solve the above problem and provide a diaphragm for a speaker, endurance against input of which is improved.
It is another objective of the present invention to provide a speaker device, a frequency characteristic as well as the endurance against input of which are improved.
In order to attain the above objective, the present invention is to provide a diaphragm for a speaker comprising a convexo-concave portion radially formed at a neck of the diaphragm, the neck being. stuck to a voice coil bobbin.
The present invention is also to provide a speaker device provided with a diaphragm, a neck of the diaphragm being stuck to a voice coil bobbin, comprising a convexo-concave portion radially formed at the neck that is stuck to the voice coil bobbin by an adhesive.
Preferably, the diaphragm is a cone-type diaphragm.
Preferably, the convexo-concave portion is radially formed over the whole circumference of the neck.
Preferably, the cone-type diaphragm comprises: a first cone-shaped part moving in the direction nearer to the voice coil in a range from the neck up to a predetermined position of the diaphragm with respect to an oscillating direction of the diaphragm; and a second cone-shaped part moving in the direction away from the voice coil in a range from the predetermined position up to an edge of the diaphragm.
Preferably, the diaphragm is a plane diaphragm.
According to the construction described above, the convexo-concave portion is radially formed at the neck of the diaphragm for a speaker and the adhesive hardened in the convexo-concave shape is adhesively provided to the voice coil, to which the neck is connected, thereby an adhesion area of the neck is increased to increase the adhesive strength and the endurance against input is improved. Moreover, the mechanical strength of the neck of the diaphragm is increased, thereby the crossover resonance of the cone-type diaphragm is restricted and the frequency characteristic is improved.
REFERENCES:
patent: 4881617 (1989-11-01), Faraone
patent: 6026929 (2000-02-01), Faraone
patent: 6130955 (2000-10-01), Aigner et al.
Dang Khanh
Pioneer Corporation
Sughrue & Mion, PLLC
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