JPS5830370Y2 - passive speaker - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a flat plate type passive speaker placed near the driving speaker of a speaker box in order to enhance bass reproduction.

Conventionally, as shown in FIG. 1, in flat plate passive speakers, the outer periphery of a diaphragm 2 whose edge portions and vibrating portions are integrally molded from synthetic rubber is adhered to the periphery of a frame 8. A light metal reinforcing plate 3 such as aluminum is attached to the surface, the upper end 10 of the cylindrical body 4 is attached to the center of the reinforcing plate 3, and the outer peripheral edge of the cylindrical body 4 is attached to the lower step of the frame 8. It is sandwiched and held at the center by dampers 9.

When such a flat passive speaker is placed near a driving speaker of a speaker box, the diaphragm 2 of the flat passive speaker resonates with the air vibrations generated by the driving speaker and vibrates.

As the surface area of the diaphragm 2 increases, its weight also increases.
A 0cmφ speaker weighs about 350g.

Since this weight and the violent vertical vibration motion are held by a large damper 9 with an outer diameter of 80 to 100 m/mφ through the cylindrical body 4, the damper 9 cannot be kept constant so as to stroke in the vibration direction of the diaphragm. is deformed, and the diaphragm 2 vibrates in an inclined manner, which has the drawback of deteriorating the frequency-sound pressure characteristics of the speaker.

If the diaphragm has a large amplitude, the amplitude will be 2 cm or more vertically, and therefore the damper will also need a large diameter.

In this case, hardening the damper strengthens the holding force, but has the disadvantage of worsening frequency characteristics.

This invention was devised as a method for preventing the tilting of the diaphragm in order to eliminate the above-mentioned drawbacks.To explain the embodiment shown in the drawings, as shown in Fig. 2, the edge part and the vibration part are integrated with synthetic rubber. The outer peripheral edge of the molded diaphragm 2 is attached to the peripheral edge of the frame 5, and a reinforcing plate 3 made of a light metal such as aluminum or synthetic resin is attached to the surface of the vibrating part of the diaphragm 2 to form a vibrating part.

The upper end 10 of the cylindrical body 4 is affixed to the center of the back surface of the vibrating part and set upright, and the damper 6 is attached to the outer periphery of the lower part of the cylindrical body 4.
This is a passive speaker in which a plurality of mounting holes are provided in each frame 5, and a plurality of springs 1 are installed at equal intervals between a damper 6 and the frame 5 to maintain balance with a cylindrical body 4 at the center.

When this passive speaker is placed near the driving speaker of the speaker box, the diaphragm 2 of this flat passive speaker resonates with the air vibration generated in the driving speaker, and each spring 1
This is an improved passive speaker in which tilting of the diaphragm 2 is prevented in advance because the cylindrical body 4 is maintained in an appropriate balance and the cylindrical body 4 is held at the center.

The effect of this invention is that the amplitude of the diaphragm can be made larger than before, and the spring has less fatigue compared to a damper.
It is also stable against heat and humidity.

The inclination of the diaphragm can be adjusted by adjusting the tensile strength of the spring, and unlike speakers with voice coils, precision is not required, making assembly easy.

As shown in Figure 3, paragraph 2 of the claim for utility model registration is as follows:
A ring-shaped baked plate 7 is pasted and glued to the outer periphery of the lower part of the cylindrical body 4,
A plurality of mounting holes are provided in the peripheral edge 11 of the baking plate 7 and the frame 5, respectively, and a plurality of springs 1 are installed at equal intervals between the peripheral edge 11 of the baking plate 7 and the frame 5, and the cylindrical body 4 is centered. It maintains balance and is effective in preventing the diaphragm 2 from tilting.

As described above, the present invention uses the spring 1 to connect the cylindrical body 4.
The diaphragm 2 is held at the center to prevent the diaphragm 2 from tilting, and the attachment of the spring 1 has no effect on sound quality, making it a practical and industrially useful idea.

[Brief explanation of drawings]

Fig. 1 is a block diagram of a conventional flat plate passive speaker, Fig. 2 is a block diagram of a flat plate passive speaker of the present invention, and Fig. 3 is a block diagram of a flat plate passive speaker according to claim 2 of the utility model registration. . 1 is a spring, 2 is a diaphragm, 3 is a reinforcing plate, 4 is a cylindrical body, 5 and 8 are frames, 6 is a wall paper, 7 is a baking plate, 9
is a damper, 10 is an upper end, and 11 is a peripheral portion.

Claims (2)

[Scope of utility model registration request] (1) A damper 6 is attached to the lower outer periphery of the cylindrical body 4, which is erected with the upper end 10 attached to the center of the back surface of the diaphragm 2 whose outer periphery is attached to the frame 5, and between the damper 6 and the frame 5. A passive speaker in which a plurality of springs 1 are installed to maintain balance around a cylindrical body 4. (2) Scope of Utility Model Registration Claim 1, in which a ring-shaped baked plate 7 is penetrated and bonded to the outer periphery of the lower part of the cylindrical body 4, and a plurality of springs 1 are installed between the peripheral edge 11 of the baked plate 7 and the frame 5. Passive speakers listed