JPS5834866Y2 - flat speaker - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of a flat-plate speaker, and particularly relates to a coupling structure between a coil bobbin and a flat-plate diaphragm.

Referring to an example of a conventional flat-plate speaker shown in FIG. 1, 1 is a flat-plate diaphragm, and a coil bobbin 3 on which a voice coil 2 to be placed in a magnetic gap is wound is vertically mounted at the center of the lower surface of the diaphragm 1. has been done.

The outer peripheral edge of the flat diaphragm 1 is connected to a frame 5 via an edge 4.

In such a configuration, the voice coil 2 vibrates due to the sound current flowing through the voice coil 2, and the coil bobbin 3
The flat diaphragm 1 vibrates and emits sound waves into the atmosphere.

Although such a flat plate type speaker can prevent the disturbance of frequency characteristics due to the front chamber effect caused by the shape of the paper cone and obtain good frequency characteristics in the conventional cone type speaker, it has the same drawbacks as the conventional cone type speaker.

In other words, the rigidity of the diaphragm in the vibration direction is small due to its flat shape, and the driving part of the diaphragm is limited to the center, so the frequency range in which piston motion occurs is small, and at higher frequencies generates split vibrations and harmful peaks and dips in frequency characteristics.

This invention is a flat-plate type speaker having a structure that solves the drawbacks of the conventional example, and the embodiment shown in FIG. 2 will be described in more detail below.

(In Figure 2, the same numbers as in Figure 1 indicate the same parts.)
In FIG. 2, reference numeral 21 is a cutout connecting the side surface of a coil bobbin 3 around which a voice coil 2 is wound, which is arranged in a magnetic gap, and the outer peripheral edge of a flat plate-like diaphragm 1, which has the upper end edge of the coil bobbin 3 fixed to the lower surface of the center. A truncated conical support 22 is disposed in a space formed by the coil bobbin 3 and the truncated conical support 21, the central bent portions are in contact with the coil bobbin, and the outer bent portions are in contact with the truncated conical support 21. These are bent supports having a substantially star-shaped cross section and fixed in contact with the inner inclined surfaces of the shaped supports.

and an upper edge of the coil bobbin, a frusto-conical support,
The upper edges of the bending supports are adhered to the lower surface of the flat diaphragm 1, respectively.

Thus, the vibration of the voice coil 2 is transmitted to the flat diaphragm 1 via the coil bobbin 3, the truncated conical support 21, and the bent support 22.

Therefore, since the vibration energy is transmitted over almost the entire surface of the diaphragm 1, and the rigidity of the diaphragm 1 is increased by the supports 21 and 22, the frequency at which split vibration occurs becomes higher.

That is, the frequency range exhibiting piston motion is expanded.

Furthermore, since the bent support body 22 has a substantially star-shaped cross section, regular vibration modes such as nodal circles are generated, and good frequency characteristics can be obtained.

As explained above, this invention is a flat speaker having a flat diaphragm, in which the upper edge of the coil bobbin 2 is fixed to the diaphragm, and the truncated conical support 21 is fixed to the circumferential side of the coil bobbin 2. By fixing the upper edges of the diaphragm 1 and the bending support 21 to the lower surface of the diaphragm 1, transmission of vibration energy is promoted and the diaphragm 1
By increasing the rigidity of the piston, it is possible to expand the piston vibration area and obtain better frequency characteristics.
It is possible to provide a flat speaker that is extremely practical and has good characteristics.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a conventional flat-plate speaker, and FIG. 2 is a partial cross-sectional view of the vibrating section of the flat-plate speaker of this invention. 1 is a flat diaphragm, 3 is a coil bobbin, 21 is a truncated conical support, and 22 is a bent support.

Claims (1)

[Scope of utility model registration request] In a speaker having a flat diaphragm 1, an upper edge of a coil bobbin 3 is fixed to the center of the lower surface of the diaphragm 1, a central bent portion is fixed to the circumferential side of the coil bobbin 3, and an external bent portion is cut. The periphery of the large opening of the truncated conical support 21 has a narrow opening fixed to the upper end surface of the bending support 22 having a substantially star-shaped cross section fixed to the inner inclined surface of the truncated conical support 21 and the circumferential side of the coil bobbin 3. are fixed to the lower surface of the diaphragm 1, respectively.