JPS5941676Y2 - speaker - Google Patents

Description

[Detailed description of the invention] This invention relates to an improvement of a cone-shaped speaker.

Conventionally, cone-shaped speakers use dust-proof caps to prevent iron powder or dust from entering the gap in the speaker's magnetic circuit, but this dust-proof cap also vibrates along with the diaphragm and acts as an acoustic radiation plate. Also plays a role.

Therefore, at low frequencies, the dust cap becomes a rigid body and vibrates together with the diaphragm, but as the frequency increases, it no longer becomes a rigid body and begins to bend, and this bending movement causes abnormal resonance around the dust cap. However, as shown by the broken line in FIG. 2, a characteristically sharp resonance peak occurs in the high frequency range.

This invention attempts to provide a speaker that improves these drawbacks.

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

In Figure 1, 1 is the yoke of the speaker, 2 is the center pole integrated with this yoke, 4 is the plate of the speaker, 3 is the magnet sandwiched between this plate and the yoke, and 5 is the plate. 6 is the drive line wheel of the speaker; 7 is a spider whose inner periphery is fixed to the outer periphery of the drive line wheel; the outer periphery is fixed to the frame to support the drive line wheel; 8 is the drive line a cone-shaped diaphragm fixed to the end of the ring, a dustproof cap 9 having a peripheral end fixed to the inner front surface of the diaphragm, and spherically formed to bulge out in front of the speaker;
Reference numeral 10 denotes an annular corrugation formed near the top of the dustproof cap so as not to impede the back and forth vibration of the diaphragm.

Reference numeral 11 denotes a support provided between the top of the dustproof cap and the center pole so that the top of the dustproof cap does not vibrate when the diaphragm vibrates.

Next, the operation of the cone-shaped speaker configured as described above will be explained.

There is an input to the drive line wheel 6, and the drive line wheel 6, diaphragm 8, and dustproof cap 9 vibrate back and forth around the speaker.

At this time, the dustproof cap is attached to a fixed part so that the top part does not vibrate, and an annular corrugation 10 is formed near the top, and this corrugation serves as a fulcrum and vibrates together with the diaphragm. Therefore, the dustproof cap is stable from low to high frequencies. The diaphragm 8 now vibrates at the same time as the diaphragm 8, and the resonance peak due to the split resonance shown by the broken line in Figure 2, which is generated by the bending movement of the dustproof cap at a high frequency like in the past, is removed as shown by the solid line in Figure 2. We were able to.

As mentioned above, the speaker of this invention has 9 dustproof caps.
An annular corrugation is formed near the top of the cap, and the top is fixed to the pillar 11 to prevent vibration, which prevents the dust cap from bending, eliminates resonance peaks, and improves sound quality and frequency characteristics. .

[Brief explanation of the drawing]

Figure 1 is a vertical cross-sectional view of the cone-shaped speaker of this invention, Figure 2
The figure shows a frequency characteristic diagram, 6 is a drive line wheel, 9 is a diaphragm,
10 is the corrugation, 11 is the pillar.

Claims (1)

[Scope of utility model registration request] a diaphragm 8 fixed to the end of the speaker drive wire 6;
In a cone-shaped speaker equipped with a dustproof cap 9 that bulges out on the front surface of the speaker and has a peripheral edge fixed to the inner front surface of the diaphragm, an annular ring is provided near the top of the dustproof cap so as not to interfere with the vibration of the diaphragm 8. In addition to forming the corrugation 10, the top of the dustproof cap has a diaphragm 8,
and a cone-shaped speaker characterized in that the dustproof cap 9 is fixed to a fixed part of the speaker so as not to vibrate even if the cap 9 vibrates.