JPH08294196A - Terminal for speaker with protective element - Google Patents

Abstract

PURPOSE: To easily produce a speaker with protective element at low cost by using a chip-shaped polymer system PTC(positive temperature coefficient) thermister as a protective element, holding this protective element between terminals and fixing the protective element. CONSTITUTION: A pair of input terminals 11a and 11b are mounted on the terminal board 14 which is calking-coupled with the terminal mounting part 15 of the frame of a speaker. On the terminal board 14, a repeater terminal 11c is mounted. The repeater terminal 11c is formed into a waveform with spring so as to hold a thin chip-shaped protective element 13 by the basal part of the input terminal 11b which is adjacent to the repeater terminal 11c and the repeater terminal 11c and the repeater terminal is made to oppress and hold a protective element 13. Because the protective element 13 composed of this chip-shaped polymer system PTC thermister is planar one and the both faces of the plate are connection electrode terminals, the protective element is held by the input terminal 11b and the repeater terminal 11c from the upper and lower directions and is fixed by spring pressure and fixed by adhesive 16 for deviation prevention.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker terminal with a protective element attached to an input portion of a speaker for the purpose of preventing the speaker from being damaged by an excessive input in the speaker used in various audio equipment.

[0002]

2. Description of the Related Art In recent years, due to the spread of semiconductors and digital audio, high power and low tone reproduction technology of stereo devices have progressed, and a large amount of input is applied to a speaker unit of the stereo device as compared with the conventional case. However, there are many cases in which the speaker unit is destroyed due to excessive input depending on the music source to be played back.

Therefore, some speaker units have
As shown in FIG. 3, the protection element 23 is connected and mounted in the circuit configuration as shown in FIG. 4, and R in FIG. 4 is the protection element 23 shown in FIG. The protection element 23 includes a pair of lead wires 22a drawn from a voice coil of a speaker on a terminal plate 24 connected to an end of a frame 25 of the speaker.
22b is connected between one terminal 21c of the pair of terminals 21a and 21c and the relay terminal 21b, and external input is input to the other terminal 21a and the relay terminal 21b of the other pair.

The protective element 23 is generally composed of a polymer PTC thermistor, and utilizes the property that the resistance value increases as the temperature rises. When an excessive input is applied, the protective element 23 is used. 23, that is, the resistance value of R in FIG. 4 increases, and the input to the speaker unit is suppressed, so that destruction is avoided.

Further, this kind of concept is based on the fact that it is actually developed.
Japanese Patent No. 161488 discloses a structure in which a protective element having a PTC characteristic of a conductive polymer is mounted as a terminal adapter on an input terminal portion of a speaker.

[0006]

However, the above-mentioned FIG.
The protection element 23 used in the conventional configuration as shown in FIG. 1 needs to be configured with lead wires, the cost of the protection element 23 itself is high, and soldering or protection element 2 for fixing is required.
However, the number of man-hours such as fixing work for vibration isolation of No. 3 is large, and the productivity is poor and the cost is high.

[0007]

In order to solve this problem, a speaker terminal with a protective element according to the present invention has a chip-shaped polymer P which does not have a lead wire as a protective element.
A TC thermistor is used, and this chip-shaped protection element is sandwiched between terminals and fixed.

[0008]

With this configuration, since the chip-shaped protective element made of the polymer PTC thermistor is fixed between the terminals, the number of assembling steps for soldering and vibration-proofing of the protective element is unnecessary, and the protective element is protected. Since the element itself has no lead wire and is low in cost, a speaker with a protective element can be provided at a low price.

[0009]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing the structure of a speaker terminal with a protective element in the embodiment. A terminal plate 1 crimped to the terminal mounting portion 15 of the speaker frame.
4, a pair of input terminals 11a and 11b are attached, and the terminal plate 14 is attached with a relay terminal 11c which serves as a third terminal. Of the input terminals 11a and 11b of the speaker, the input terminal 11b adjacent to the relay terminal 11c
The relay terminal 11c is formed in a corrugated shape having a spring property as shown in the cross-sectional structure of FIG. 2 so that the thin chip protection element 13 can be sandwiched between the root part of the relay terminal 11c and the relay terminal 11c. It is designed to hold down the repression.

The protective element 13 made of a chip-shaped polymer PTC thermistor is plate-shaped, and both sides of the plate serve as connection electrode terminals. Therefore, the input terminal 11b and the relay terminal 1 are provided.
As shown in FIG. 2, it is sandwiched from above and below by 1c and is fixed by spring pressure, but it is fixed by an adhesive 16 to prevent displacement. The pair of lead wires 12a and 12b drawn from the voice coil of the speaker are connected to the input terminal 11a and the relay terminal 11c as shown in FIG. 1, and form the connection circuit of FIG. 4 described in the prior art.

With this configuration, when the signal applied to the input terminals 11a and 11b becomes an excessive input that destroys the speaker, the polymer P in a chip shape is used.
An excessive current flows through the protective element 13 composed of a TC thermistor, and the resistance value of the protective element 13 rises and the current value is limited and becomes small. Therefore, an excessive current does not flow in the speaker connected in series with the protective element 13. Destruction will be prevented.

Although not shown, a through hole is formed in the spring-shaped relay terminal 11c and the input terminal 11b which sandwich the protective element 13 made of the chip-shaped polymer PTC thermistor shown in FIG. By providing the structure, the electrode surface of the protection element 13 can be seen through the through hole, and the relay terminal 1 having a spring shape is formed in the through hole.
1c and the electrode surface of the protective element 13 and the input terminal 11b and the electrode surface of the protective element 13 can be fixed by soldering, and a more reliable connection can be achieved and reliability can be improved.

[0014]

As described above, the speaker terminal with a protective element according to the present invention is capable of producing a speaker with a protective element having a built-in protective element for preventing excessive input, with easy workability and at low cost. .

[Brief description of drawings]

FIG. 1 is a perspective view showing a configuration of a speaker terminal with a protective element according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the main part of the embodiment.

FIG. 3 is a perspective view showing a configuration of a conventional speaker terminal with a protective element.

FIG. 4 is a connection circuit diagram of an embodiment of the present invention and a conventional example.

[Explanation of symbols]

 11a, 11b Input terminal 11c Relay terminal 12a, 12b Lead wire 13 Protective element 14 Terminal plate 15 Terminal mounting part 16 Adhesive

Claims (3)

[Claims] 1. Three terminals, one of a pair of terminals connected to a pair of lead wires drawn from a voice coil of a speaker being an external terminal and the other being a relay terminal connected to a second external terminal via a protective element. Speaker terminal with a protective element consisting of a structure. 2. The speaker terminal with a protective element according to claim 1, wherein a chip-shaped element of a polymer-based PTC thermistor is used as the protective element, and is sandwiched by a relay terminal having a spring property and elastically held. 3. The terminal for a speaker with a protection element according to claim 2, wherein a through hole is provided in an abutting portion of a relay terminal having a spring property that abuts on an electrode surface of the chip-shaped protection element.