JPS61121689A - Speaker - Google Patents

Abstract

PURPOSE:To prevent the resonance (dip and peak) of an intermediate area on a sound pressure frequency characteristic and to remove a harmonic distortion by installing partially a slit on the whole circumference of the corner part of the inner diameter part of an edge roll and constructing a speaker with visco-elastic adhesives on the whole circumference including the slit. CONSTITUTION:A diaphragm stuck with an edge 2 having a roll 3 at the outside of the outer diameter 5 of the diaphragm 1 is constructed, the notch of a slit 6 is instaled on the circumference of a roll inner diameer 4 while remaining the part of the notch on the whole circumference, the slit is installed while an edge and a diaphragm are not completely separated, visco-elastic adhesives are equally applied on the whole circumference including the slit part 6 on a roll inner diameter 4 from the rear surface, and by bonding and simultaneously closing the clearance of the slit part, the strength, which is weak after slitting, is increased, and simultaneously, the reliability is also improved.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a speaker diaphragm used in an electrodynamic speaker.

Conventional technology Diaphragms used in conventional speakers are shown in Figures 4a and b.
The structure is as follows. That is, the speaker had a diaphragm having a free edge type structure in which the surface of a conical cone 1 and the edge 2 of a concave roll 3 made of different materials were bonded together.

Problems to be Solved by the Invention However, in the former configuration of a speaker with a diaphragm sheet metal, resonance occurs in the middle range of the sound pressure frequency characteristic due to the electrical characteristics of the speaker, sharp dips and peaks occur, and harmonics There is a problem that distortion occurs. This is a problem caused by interference between the resonance of the diaphragm and the resonance of the edge portion, and is particularly a problem that occurs when the diaphragm is lightweight and the edge member has low internal loss, such as wire cloth.

Therefore, the present invention provides the following advantages: without reducing the sound pressure level,
Removes dips and peaks in the midrange on sound pressure frequency characteristics,
The present invention provides a speaker having a diaphragm plate that can also eliminate harmonic distortion.

Means for Solving the Problem In order to solve this problem, the present invention provides a slit-like cut on the entire circumference of the corner portion where the outer diameter of the diaphragm is equal to or smaller than the inner diameter of the edge roll. It has a diaphragm that is in contact with the edges and the inner peripheral surface of the roll, and has a viscoelastic adhesive completely applied to the corners of the inner diameter of the roll to close the cuts of the slits.

By connecting the working diaphragm and the edges with a fully viscoelastic adhesive, the weight of the edges does not change and the resonance of the diaphragm is absorbed, eliminating interference with the edges and improving the mid-range sound pressure frequency characteristics. It has excellent characteristics, with no resonance or high-frequency distortion.

EXAMPLE A speaker diaphragm according to an example of the present invention will be described below.

As shown in FIGS. 1A and 1B and 2A and 2B, the diaphragm of the speaker is cone-shaped. Outer diameter 5 of diaphragm 1
The diaphragm has a structure in which an edge 2 with a roll 3 is pasted on the outside of the diaphragm, and a slit 6 is cut on the circumference of the inner diameter 4 of the roll, leaving a part on the entire circumference, so that the edge and the diaphragm are completely connected. By providing a slit without separating the roll, and applying a viscoelastic adhesive evenly from the back side to the entire circumference, including the 6 slits on the inner diameter of the roll, the adhesive is bonded and at the same time, the gap between the slits is sealed. It compensates for the strength that was weakened by slitting, and at the same time improves reliability. Its characteristics and the characteristics of the conventional one are shown in FIG. Due to the structure in which viscoelastic adhesive is applied on the entire circumference, mid-range resonance (dip, peak) in sound pressure frequency characteristics
The present invention has the great effect of preventing harmonic distortion and eliminating harmonic distortion, and it is possible to provide a speaker with excellent characteristics without increasing the weight of the diaphragm or reducing the sound pressure level.

[Brief explanation of the drawing]

FIGS. 1a and 1b are a cross-sectional view and an enlarged perspective view of a main part of a diaphragm of a speaker according to an embodiment of the present invention, and a cross-sectional view and a plan view of a diaphragm of a P force. 1... diaphragm, 2... edge, 3...
...Roll, 4...Roll inner diameter, θ...
...Slit, 7...Adhesive. Name of agent: Patent attorney Toshio Nakao and 1 other person 1st
Fig. 2 Fig. 4 Fig. 3 Placement and number of bamboo m Nagaku

Claims (1)

[Claims] The cone surface and edge of the diaphragm structure of the electrodynamic speaker are bonded together, and a slit-like cut is made on the entire circumference of the corner of the inner diameter part of the edge roll, and a viscoelastic damping agent is applied to the slit part. A speaker with a diaphragm coated with