JP3675950B2 - Small electrodynamic speaker - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a small electrodynamic loudspeaker used for electrical equipment.
[0002]
[Prior art]
In general, when a speaker is installed, the speaker is mechanically fixed, and lead wires are connected to the + and-terminals of the speaker by soldering, screwing, crimping, and the like.
[0003]
[Problems to be solved by the invention]
However, as represented by mobile phones, small electric devices have become smaller and higher in performance, and the volume that can be used exclusively by the portion that converts electric signals into sound has become extremely small. At the same time, cost reduction and reliability are required. Therefore, it has been desired to develop a simple structure that can be installed in a casing of an electric device in a stable state. In addition, since the proportion of the soldered portion of the lead wire increases in inverse proportion to the miniaturization of the speaker, when the speaker is actually incorporated into the housing, a considerably large portion is occupied only by the terminal. There was a problem that it became an obstacle to miniaturization of.
[0004]
The present invention has been made in view of the above points, and can be installed in a stable state in a casing of an electric device, and an audio signal output wired in the casing without soldering a lead wire to a terminal. An object of the present invention is to provide a small electrodynamic speaker that can maintain a good contact state with a terminal and is versatile.
[0005]
[Means for Solving the Problems]
A spring mechanism is provided on the back of the small electrodynamic speaker. When the small electrodynamic speaker is disposed in the housing of the electric device, the spring mechanism can be pressed in the housing and stably installed in the housing. Moreover, since this spring mechanism is comprised with the conductor, this spring mechanism and the audio | voice signal output terminal of a housing | casing will conduct | electrically_connect, and a sound will come out.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
The small electrodynamic speaker of the present invention is a small electrodynamic speaker installed in a housing of an electric device, and is constructed between two terminals of the same polarity provided on the back surface and the terminals of the same polarity. A contact made of an elastic conductor having a protrusion, and can be installed in a stable state in the housing, and at the same time, the contact is in good contact with an audio signal output terminal wired in the housing It has the feature that it can be kept.
[0007]
Further, the small electrodynamic speaker of the present invention is a small electrodynamic speaker installed in a housing of an electric device, comprising an elastic member made of a nonconductor provided on the back surface and a flexible printed wiring board provided on the back surface. And connecting the flexible printed wiring board to the lead wire of the moving coil and fixing one end to the elastic member, so that the flexible printed wiring board can be stably installed in the housing, and at the same time, The conductor pattern is characterized in that a good contact state can be maintained with the audio signal output terminal wired in the casing.
[0008]
【Example】
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 8 is a cross-sectional view showing a general configuration of an electrodynamic speaker unit. In the figure, 1 is an electrodynamic speaker unit, 2 is a protector located on the front surface, 3 is a diaphragm, 4 is a moving coil, 5 is a pole piece, 6 is a frame, 7 is a magnet, 9 is a through hole, Reference numeral 10 denotes a terminal.
[0009]
Next, a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a rear perspective view of a small electrodynamic speaker. In addition, what attached | subjected the same code | symbol as FIG. 8 has each shown the same element, and abbreviate | omits description. In the figure, 8 is a damper for attenuating free vibration, 10a is a + terminal provided at two locations above and below the back surface, and 10b is a-terminal provided at two locations above and below the back surface. 11a is a contact A laid between two + terminals 10a, and 11b is a contact B laid between two-terminals 10b.
[0010]
FIG. 2A is a perspective view of one contact of the small electrodynamic speaker, and FIG. 2B is a perspective view of the other contact. As is apparent from the figure, the contact A11a, which is one of the contacts, has two protrusions 15, and this protrusion 15 comes into contact with the audio signal output terminal wired in the housing. The contact B11b, which is the other contact, has one protrusion 15, and this protrusion 15 comes into contact with an audio signal output terminal wired in the housing. The material of these contacts is a spring material such as phosphor bronze made of an elastic conductor.
[0011]
FIG. 3A is an explanatory view showing the arrangement of one contact, and FIG. 3B is an explanatory view showing the arrangement of the other contact. One contact A11a is provided with two protrusions 15 and is spanned between two positive terminals 10a. One protrusion 15 is provided on the other contact B11b, and spans between two negative terminals 10b. These protrusions 15 are pushed by the audio signal output terminals wired in the housing, and a stable installation state and a good contact state can be maintained at three points. In the example, the number of protrusions 15 is two and one, but it is not necessary to limit to this number.
[0012]
Next, a second embodiment of the present invention will be described with reference to FIGS. FIG. 4 is a rear perspective view of a small electrodynamic speaker. In addition, what attached | subjected the same code | symbol as FIG. 1 has each shown the same element, and abbreviate | omits description. In the figure, 16 is an elastic member made of a nonconductor provided on the back surface, and 12 is a semicircular arc flexible printed wiring board.
[0013]
FIG. 5 is a front view of the flexible printed wiring board in the second embodiment. This is a flexible printed wiring board provided with a wiring pattern such as copper foil on one side or both sides. The semicircular arc-shaped flexible printed wiring board 12 has land patterns A12a as terminal portions connected to the lead wires of the moving coil 4 at two central portions, land patterns B12b as contact portions at both ends, and these land patterns. A wiring pattern 12c connecting between 12a and 12b is provided.
[0014]
FIG. 6 is an explanatory view showing the arrangement of the flexible printed wiring board of the small electrodynamic speaker in the second embodiment. The land pattern A12a of the semicircular arc-shaped flexible printed wiring board 12 is connected to the lead wire of the moving coil 4, and is fixed in the vicinity of the connecting portion. Subsequently, in order to use the flexible printed wiring board 12 itself as a contact, the land pattern B12b at both ends is lifted and bonded to the top of the elastic member 16 attached to the back surface of the speaker unit 1. When the conductor pattern of the flexible printed wiring board 12 is a single side, the terminal portion connected to the lead wire of the moving coil 4 can be reinforced in combination with a rigid board.
[0015]
When the speaker unit 1 is inserted into the housing, the two land patterns B12b serve as contact points, and come into contact with the electrical signal output terminal in the housing with an appropriate pressure by the cushion of the elastic member 16. Therefore, it is not a point contact as in the first embodiment, but is crimped to the electrical signal output terminal in the housing with a certain area and is fixed to the housing in a stable state.
[0016]
FIG. 7 is a perspective view of a flexible printed wiring board according to another second embodiment. In the figure, 13 is an annular flexible printed wiring board. The flexible printed wiring board 13 is provided with land patterns A13a as terminal portions to be connected to the lead wires of the moving coil 4 at two positions at symmetrical positions, and a wiring pattern 13c having a semicircular arc shaped terminal portion having the same polarity. It is tied with. Furthermore, a more stable contact can be obtained by providing a land pattern B13b as a contact portion at the center of the wiring pattern 13c.
[0017]
This flexible printed wiring board 13 can be used in the speaker unit 1 as shown in FIG. 1, and is selectively connected to the lead wire of the moving coil 4 at four locations on the back surface of the speaker unit 1. It adheres to the top of the elastic member 16 attached to the back of the speaker unit 1 at a location. Therefore, the number of parts is small and work efficiency is improved. The flexible printed wiring board 13 can also be used for the speaker unit 1 as shown in FIG.
[0018]
【The invention's effect】
As described above, the small electrodynamic speaker according to the present invention has two contacts of the same polarity provided on the back surface, and a contact made of an elastic conductor having a protrusion provided between the terminals of the same polarity. Can be installed in a stable state in the housing, and at the same time, the contact can be kept in good contact with the audio signal output terminal wired in the housing,
The small electrodynamic speaker according to the present invention includes an elastic member made of a nonconductor provided on the back surface and a flexible printed wiring board provided on the back surface, and connects the flexible printed wiring board to a lead wire of the moving coil. And an audio signal output terminal in which the conductor pattern of the flexible printed wiring board is wired in the casing, and can be stably installed in the casing by fixing one end to the elastic member. Because it can keep good contact
This eliminates the soldering operation, thereby improving productivity, reducing costs, and improving reliability.
[Brief description of the drawings]
FIG. 1 is a rear perspective view of a small electrodynamic speaker according to a first embodiment of the present invention.
FIG. 2A is a perspective view of one contact of the small electrodynamic speaker according to the first embodiment of the present invention, and FIG. 2B is a perspective view of the other contact.
3A is an explanatory view showing the arrangement of one contact of the small electrodynamic speaker according to the first embodiment of the present invention, and FIG. 3B is an explanatory view showing the arrangement of the other contact.
FIG. 4 is a rear perspective view of a small electrodynamic speaker according to a second embodiment of the present invention.
FIG. 5 is a front view of a flexible printed wiring board according to a second embodiment of the present invention.
FIG. 6 is an explanatory diagram showing an arrangement of flexible printed wiring boards of a small electrodynamic speaker according to a second embodiment of the present invention.
FIG. 7 is a perspective view of a flexible printed wiring board according to another second embodiment of the present invention.
FIG. 8 is a cross-sectional view showing a configuration of an electrodynamic speaker unit.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Speaker unit 2 Protector 3 Diaphragm 4 Moving coil 5 Pole piece 6 Frame 7 Magnet 8 Damper 9 Through-hole 10 Terminal 10a + terminal 10b-terminal 11a Contact A
11b Contact B
12 Flexible Printed Circuit Board 12a Land Pattern A
12b Land pattern B
12c Wiring pattern 13 Flexible printed wiring board 13a Land pattern A
13b Land pattern B
13c Wiring pattern 15 Protrusion 16 Elastic member

Claims (2)

In a small electrodynamic speaker installed in the housing of an electric device,
Two terminals of the same polarity provided on the back,
A contact made of a resilient conductor having a protrusion laid between the terminals of the same polarity,
A small electrodynamic speaker characterized in that it can be installed in a stable state in the case and at the same time the contact can be kept in good contact with an audio signal output terminal wired in the case. . In a small electrodynamic speaker installed in the housing of an electric device,
An elastic member made of a nonconductor provided on the back surface;
With a flexible printed wiring board provided on the back,
By connecting the flexible printed wiring board to the lead wire of the moving coil and fixing one end to the elastic member, the flexible printed wiring board can be stably installed in the casing, and at the same time, the conductor pattern of the flexible printed wiring board Is a small electrodynamic speaker characterized in that it can maintain a good contact state with an audio signal output terminal wired in the housing.

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