JPS599507Y2 - speaker - Google Patents

Description

[Detailed description of the invention] This invention relates to a speaker using a diaphragm with a printed voice coil, and aims to improve input resistance by efficiently dissipating heat generated in the printed voice coil. It is.

Generally, this type of speaker was constructed as shown in FIG.

That is, magnets 2 and 3 are arranged on both sides of a plate-shaped center pole 1, and an inverted L is placed on the outer surface of these magnets 2 and 3.
A magnetic circuit 8 is constructed by arranging the letter-shaped yokes 4 and 5 to form a magnetic gap 6 and 7 between the yoke 4 and the center pole 1. A vibrating membrane 10 made of polyimide or the like with aluminum foil attached and etched to form a spiral printed voice coil 9.
, the printed voice coil 9 is made to correspond to the magnetic gaps 6 and 7, a fixing ring 11 is attached to the peripheral edge of the diaphragm 10, and a sound absorbing material 12 such as glass fiber is placed on the top of the diaphragm 10. A front net 13 is placed on the sound absorbing material 12 and the fixing ring 11, and the front net 13 is closed with a buff-full plate 14 that is connected to the magnetic circuit 8.

This speaker can reproduce sounds up to extremely high pitches, and has features that other types of speakers do not have, such as very good input response.

However, in this speaker, the cross-sectional area of the printed voice coil 9 is very small, and since it is made of aluminum, the resistance value per unit length is large and it is easy to generate heat when input is applied.

Moreover, since there is no metal material such as yokes 4 and 5 with good heat conduction near the printed voice coil 9, heat radiation is extremely poor.

This means that the rate of increase in the resistance value of the printed voice coil 9 is high, which has the drawback of poor input resistance and poor dynamic range.

Conventionally, as shown in FIG. 2, glass fibers have been used as the sound absorbing material 12, and no heat dissipation measures have been taken, resulting in the above-mentioned problems still occurring.

The present invention eliminates the above-mentioned drawbacks of the prior art.

Hereinafter, an embodiment of the present invention will be explained with reference to FIG. 3 of the drawing.

The overall structure is the same as that shown in FIG. 1, and only the features of the present invention will be explained here.

That is, in the present invention, glass fiber coated with aluminum is used as the sound absorbing material 12, and is brought into close contact with the vibrating membrane 10.

With this sound absorbing material 12, the heat generated in the printed voice coil 9 is dissipated to the outside through the sound absorbing material 12 made of glass fiber deposited with aluminum, suppressing the temperature rise of the printed voice coil 9, and improving the input resistance and dynamic The range can also be made larger.

Note that aluminum can be deposited to a thickness of about several hundred amperes to provide sufficient thermal conductivity, and can be easily and inexpensively deposited on glass fibers.

Moreover, when about several hundred people deposit aluminum, the mass of the sound absorbing material 12 increases little, and the sound pressure level hardly decreases.

As described above, since the speaker of the present invention is structured, the heat dissipation of the printed voice coil is significantly improved, and therefore the input resistance is also improved, there is no increase in cost, there is almost no decrease in efficiency, and it has practical value. It is a great thing.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a general speaker, FIG. 2 is a sectional view of a main part of a conventional speaker, and FIG. 3 is a sectional view of a main part of an embodiment of the speaker of the present invention. 1...Center pole, 2,3...Magnet, 4,5...Yoke, 6,7...
...Magnetic gap, 8...Magnetic circuit, 9...
... Printed voice coil, 10 ... Vibration membrane, 12 ... Sound absorbing material, 13 ... Front net.

Claims (1)

[Scope of utility model registration request] In a speaker, a diaphragm in which a printed voice coil is formed faces the magnetic gap of a magnetic circuit composed of a center pole, a magnet, and a yoke, and a sound-absorbing material is placed on the diaphragm. A speaker constructed of glass fibers coated with metal.