JPS6342630Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a speaker, and in particular to a speaker that releases back pressure from a diaphragm through a through hole and a damping material, applies appropriate damping to the speaker, and controls sound pressure frequency characteristics. It is something.

Conventionally, this type of speaker is known as shown in FIG. FIG. 1 is a sectional view of a small speaker unit used in a headphone, in which a magnetic circuit A is housed in a yoke portion 1a that is a part of a frame 1 and has a U-shaped cross section, and in the center of the yoke portion 1a. It is composed of a magnet 2 and a pole piece 3 placed on the magnet 2, and a ring-shaped magnetic gap 4 is formed between the upper inner wall of the yoke portion 1a and the pole piece 3. A flange 1b that expands outward is integrally formed on the outer periphery of the yoke portion 1a of this magnetic circuit, and the flange 1b is provided with a plurality of through holes 1c and supports the outer periphery of the diaphragm 5. There is. A voice coil 6 is fixed to the center portion of the diaphragm 5.
is located within the magnetic gap 4. Furthermore, as can be seen from FIG. 2, a damping material 7 such as nonwoven fabric, metal mesh, or foamed urethane is fixed with adhesive to the back surface of the flange 1b, which is the back side of the through hole 1c, and the damping material 7 is fixed with adhesive to the back surface of the flange 1b, which is the back side of the through hole 1c. A terminal plate 8 for connecting an external input cord to the voice coil 6 is fixed with adhesive to the rear surface of the unit.

The sound emitted from the back surface of the diaphragm 5 is transmitted through the through hole 1.
c, further passes through the damping material 7, is damped by a certain amount depending on the density, thickness, etc. of the damping material 7, and is radiated to the external free space.

In such a speaker, the damping material 1 is pasted with adhesive, so the adhesive may enter the through hole 1c, or depending on how it is applied, the damping material 7 may float from the through hole 1c. However, there were variations in the amount of braking, and it was difficult to make the reproduction frequency characteristics of the speaker constant.

The present invention was created in view of the above points, and aims to provide a speaker with stable performance in which the damping amount of the speaker is constant and the reproduction frequency band and sound pressure frequency characteristics do not vary depending on the product. shall be.

Embodiments of the present invention will be described below based on the drawings.

FIG. 3 is a half-sectional view of a speaker according to an embodiment of the present invention, in which a frame 1 consisting of a yoke portion 1a, a flange 1b, a through hole 1c, etc., a magnet 2 and a pole piece 3 housed in the yoke portion 1a are formed. The magnetic circuit A, the voice coil 6 and the diaphragm 5 suspended in the magnetic gap 4 have the same structure as the conventional example shown in FIG.

A damping material 7 is disposed on the back surface of the flange 1b, and this damping material 7 may be made of non-woven fabric, metal mesh,
It is made of a material such as foamed urethane and formed into a ring shape, and is fitted onto the outer periphery of the yoke portion 1a, and is connected to the terminal plate 8 which is formed into a ring shape and fitted into the yoke portion 1a in the same manner as the braking material 7. It is crimped and clamped on the back surface of the flange 1b. At this time, no adhesive was applied to the contact surface of the brake material 7 with the flange 1b. However, an adhesive may be applied to the inner circumferential surface of the brake member 7 that fits into the yoke portion 1a or the upper surface that contacts the terminal plate 8 for the purpose of fixing the brake member 7.

FIG. 4 is an exploded perspective view of the embodiment of the present invention shown in FIG. It has a notch 8c and is given elasticity. Therefore, by simply fitting the terminal plate 8 into the yoke portion 1a using its elasticity, the braking member 7 can be clamped and fixed at a predetermined position with a predetermined thickness. Of course, the voice coil 6 and an external input cord (not shown) are connected to the copper foil 8b, and the voice coil 6 is driven by a signal current from the external input cord.

In the above embodiment, the back pressure of the diaphragm 5 is applied to the damping material 7 through the through hole 1c, but since no adhesive is attached to the adhesive surface of the damping material 7 with the flange 1b, the damping material 7 is The power is determined by the through hole 1c and the acoustic impedance passing from the through hole 1c through the damping material 7 to the outer peripheral surface of the damping material 7. Therefore,
By selecting the position of the terminal plate 8 and changing the pressure applied to the damping material 7, it is possible to always apply a constant required braking force to the speaker.

In the above embodiment, the positioning of the terminal plate 8 is as follows:
This is done by using a positioning jig when fitting the terminal plate 8, but grooves, protrusions, etc. are formed on the outer peripheral surface of the yoke portion 1a, and the engagement between the grooves, protrusions, etc. and the terminal plate 8 It is also possible to perform positioning.

Further, although the magnetic circuit A into which the brake material 7 is fitted is of an internal magnetic type integrated as the frame 1 in this embodiment, the present invention is not limited to this.
It may be an external type magnetic circuit of a general speaker in which the frame 1 is fixed on a top frame.

The present invention is as described above, and a terminal plate for connecting an input cord is fitted onto the outer periphery of the magnetic circuit, and the damping material located on the back side of the diaphragm is sandwiched between the terminal plate and the back surface of the flange on the outer periphery of the magnetic circuit. It is characterized by

Therefore, it is possible to mass-produce products with a stable damping amount, constant speaker frequency characteristics, and consistent quality, and because the damping material can be fixed at the same time as the terminal board, work is simplified and costs are reduced. This has the effect of reducing the amount of down.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a conventional speaker, Fig. 2 is a perspective view showing the bottom of the speaker in Fig. 1, Fig. 3 is a half sectional view of a speaker according to an embodiment of the present invention, and Fig. 4 is an embodiment of the present invention. FIG. 3 is an exploded perspective view showing the frame, damping material, and terminal board of the example speaker. 1b...flange, 1c...through hole, 5...diaphragm, 6
...voice coil, 7...braking material, 8...terminal board, A...
magnetic circuit.

Claims (1)

[Scope of utility model registration request] A magnetic circuit for driving the voice coil is provided in the center, and a flange extending around the outer circumference of the magnetic circuit supports the outer circumference of the diaphragm fixed to the voice coil, and a transparent flange is provided on the back of the diaphragm. In a speaker in which a hole is formed and a damping material is placed in the through hole, a terminal plate for connecting an input cord is fitted onto the outer periphery of the magnetic circuit, and the damping material is applied between the terminal plate and the back surface of the flange. A speaker characterized by being held in place.