JPS6035343Y2 - Planar diaphragm speaker - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a flat diaphragm type speaker, and more specifically, to a coaxial type flat diaphragm type speaker.

Planar diaphragm type speakers have recently started to gain popularity because they have a relatively flat frequency response over a wide band and do not cause front chamber effects or split vibrations, but the diaphragm itself is different from cone type diaphragms. Because they are expensive, the speakers themselves are also expensive.

Therefore, this idea was created in consideration of the high cost of coaxial planar diaphragm speakers that have been provided in the past, as each diaphragm is equipped with a voice coil and a magnetic circuit. The aim is to reduce costs by sharing as many component parts as possible, and to provide a speaker that does not require any directionality in mounting or installation. In addition to serving as a diaphragm, the inner periphery of the cone-shaped vibration transmitter is fixed to the voice coil bobbin, and the outer periphery is fixed to the low-frequency diaphragm. This is characterized in that the fixed position is an ideal drive position.

The details of this invention will be explained below with reference to the attached drawings.

First, in the figure, reference numeral 1 indicates a speaker frame, a driver unit 2 is fixed to this speaker frame 1, and a voice coil 3a wound around a bobbin 3 is located in the magnetic gap of this driver unit 2. .

The end of the bobbin 3 is directly fixed to a high-frequency diaphragm 4, and the periphery of the high-frequency diaphragm 4 is fixed to an inside frame 1a constituting the speaker frame 1 by an edge 4a.

Furthermore, a low frequency diaphragm 5 is arranged around the outer periphery of the high frequency diaphragm 4, and the inside of the low frequency diaphragm 5 is supported by an edge 5a on the inside frame 1a, Speaker frame 1 is attached to the outside by edge 5b.
is attached to the flange portion 1b via a gasket 5c.

One end 6a of a cone-shaped vibration transmitter 6 is fixed to the back side of the low-frequency diaphragm 5, and the other end 6b of the vibration transmitter 6 is fixed to the outer peripheral surface of the bobbin 3. There is.

Next, the operation of the planar diaphragm type speaker of this invention will be explained.

Although the speaker of this invention employs a two-way system, there is only one driver unit, and the voice coil 3a is supplied with the same low and high voice current.

Since this audio current covers a wide range from low to high frequencies, low-frequency vibrations are propagated to the high-frequency diaphragm 4 and vibrated in the same way as high-frequency vibrations, but the high-frequency diaphragm 4 Since the area is small, the bass reproduction efficiency is extremely low, so only the treble is reproduced.

Furthermore, when a sound current is supplied to the voice coil 3a, the bobbin 3 also vibrates in the same way as the diaphragm, and this vibration is transmitted to the low-frequency diaphragm 5 by the vibration transmitter 6 whose end is fixed to the bobbin 3. .

Due to this vibration transmission, the low-frequency diaphragm 5 vibrates including a high-frequency reproduction vibration component, but the low-frequency diaphragm 5 has a larger area than the high-frequency diaphragm 4, and has a larger area than the high-frequency diaphragm 4. Since the transmitter 6 has some hump bias, only bass sounds are reproduced.

In short, the high-frequency diaphragm 4 and the low-frequency diaphragm 5
does not have an independent driver unit, but
When both diaphragms are put together, they vibrate as a mechanical two-way, and the state is shown in the diagram in FIG.

As is clear from the above explanation, the planar diaphragm type speaker of this invention doubles as the driver unit of the high-frequency diaphragm and the low-frequency diaphragm, and the bobbin and the low-frequency diaphragm are connected to each other. Since they are connected by a vibration transmitter, combining the vibration states of the two diaphragms creates a mechanical 2-way speaker.A coaxial type planar diaphragm speaker has a simple configuration and can be supplied at low cost. It is thin and can be used for car stereos, TVs, and casinos.
Since it is a coaxial format, the arrival time of bass and treble is equal,
You can freely choose to install the system vertically or horizontally.

[Brief explanation of drawings]

The accompanying drawings show an embodiment of a flat diaphragm type speaker according to this invention, in which FIG. 1 is a longitudinal sectional side view, FIG. 2 is an enlarged sectional view of the part 2 in FIG. 1, and FIG. 3 is a frequency sound pressure curve diagram. 1...Speaker frame, 1a...Inside frame, 2...Driver unit,
3...Bobbin, 3a...Voice coil, 4...Diaphragm for high range, 4a...Edge, 5...Low range Vibration plate for 5a*5b...
...Etsuji.

Claims (1)

[Scope of utility model registration request] A coaxial flat diaphragm speaker has a high-frequency diaphragm to which one end of the voice coil bobbin is fixed, a low-frequency diaphragm placed around it, and a low-frequency diaphragm to which one end is fixed to the voice coil bobbin. and a cone-shaped vibration transmitter whose other end is fixed to the low-frequency diaphragm.