JPS5848872Y2 - speaker - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a speaker using a circular flat diaphragm, and aims to prevent horizontal vibration (rolling) of the diaphragm and improve input resistance.

FIG. 1 shows a conventional speaker of this type.

In FIG. 1, 1 is a yoke, and a through hole is formed in the center of the upper and lower plates of this yoke 1.

Reference numeral 2 denotes an annular magnet fixed to the upper surface of the lower plate of the yoke 1, and an annular yoke 3 is fixed to the upper surface of the magnet 2.

An annular magnetic gap is formed between the outer peripheral surface of the yoke 3 and the inner peripheral surface of the hole in the upper plate of the yoke 1.

4 is a frame fixed to the upper surface plate of the yoke 1, and 5 is a circular flat plate diaphragm, and the flat plate diaphragm 5 is a diaphragm made of a honeycomb core with surface materials bonded to both sides.

This flat diaphragm 5 is supported by the frame 4 via an annular edge member 6.

7 is a cylindrical coil bobbin attached to the lower surface of the flat diaphragm 5, and this coil bobbin 7 has a voice coil 8.
is wound.

This voice coil 8 is located at the magnetic gap portion.

9 is a damper that supports the coil bobbin 7.

In FIG. 1, when a signal is applied to the voice coil 8,
The edge member 6, the coil bobbin 7 supported by the damper 9, and the diaphragm 5 vibrate together to radiate sound.

In the conventional speaker shown in FIG. 1, a coil bobbin 7 is attached to the nodal circle of the primary resonance mode V+o of the flat plate diaphragm 5, and the inside of the cylinder of the flat plate diaphragm 5 is driven.
This is a speaker that can eliminate the first-order resonance mode VIO and widen the reproduction band to the frequency at which the second-order resonance mode V20 occurs.

However, in the conventional speaker described above, since the length of the voice coil 7 is short in proportion to the diameter of the flat diaphragm 5, the vibration system is not sufficiently supported by the damper 9 and the edge member 6, and the balance of the vibration state is lost. Lateral vibration (
This has the disadvantage that the voice coil 8 hits the yoke and generates abnormal noise, especially when the output is high.

In order to eliminate the above-mentioned drawbacks of the conventional method, the coil bobbin 7 may be made longer and the point supported by the damper 9 may be placed farther away from the flat plate diaphragm 5. However, in this case, the mass of the coil bobbin 7 increases, and the flat plate diaphragm 5 increases, the resonant frequency of the secondary resonance mode V20 decreases, and the reproduction band becomes narrower.

Furthermore, when the coil bobbin 7 becomes longer, the space inside the coil bobbin 7 increases, and resonance due to this space occurs at a low frequency, which deteriorates the sound quality.

The present invention eliminates the above-mentioned drawbacks of the conventional technology, and embodiments of the present invention will be described below with reference to the drawings.

Embodiment 1 In FIG. 2, 7 indicates the primary resonance mode V of the flat diaphragm 5.
The coil bobbin 10 fixed inside the IO section is a truncated conical cylinder made of highly rigid aluminum AI, titanium Ti, paper, etc., and the large-diameter end face of the truncated conical cylinder 10 causes flat plate vibration inside the coil bobbin 7. It is glued to the bottom surface of the plate 5.

Reference numeral 11 denotes a sub-damper attached to the upper surface of the yoke 3, and the small-diameter end side of the truncated conical cylinder 10 is bonded to the center hole of the sub-damper 11.

According to this embodiment, since the number of supporting points of the diaphragm increases, the supporting force becomes stronger and lateral vibration is less likely to occur.Furthermore, by using the truncated conical cylinder 10, the large diameter side is placed on the diaphragm side. Since the small portion side is fixed to the sub-damper 11 side, this has the advantage that the resistance against torsion is higher than when a simple cylinder is used, and the supporting force of the diaphragm is stronger.

Embodiment 2 As shown in FIG. 3, this embodiment is applied to a speaker having an external magnetic circuit.

The support structure for the circular diaphragm 5 and coil bobbin 7 in this embodiment is the same as that in the embodiment shown in FIG.

Embodiment 3 As shown in FIG. 4, the end face of a truncated conical cylinder 10 on the large diameter side is adhered to the lower surface of the flat plate diaphragm 5, and the cylindrical body 1 is attached on the small diameter side.
2, and the lower part of this cylindrical body 12 is supported by the sub-damper 11 supported by the yoke 3. By using the cylindrical body 12, the support point of the sub-damper 11 can be moved from the flat plate diaphragm 5. This allows the flat diaphragm to be supported more stably.

Embodiment 4 As shown in FIG. 5, one end of a long cylindrical body 12 is glued to the small diameter side of a truncated conical cylinder 10, and this cylindrical body 12 is inserted into a through hole in the center of a magnetic circuit. The other end of the cylindrical body 12 is bonded to a sub-damper 11 attached to the lower surface of the yoke 1, and compared to the embodiment shown in FIG. It can be provided at a point away from the plate 5, and the support of the diaphragm can be made more stable.

Note that it is also possible to apply a support structure similar to this embodiment to a speaker having an external magnetic circuit.

Embodiment 5 As shown in FIG. 6, two sub-dampers 11°11'
The upper and lower parts of the cylindrical body 12 are connected to the sub-damper 1 using
1.11'.

Embodiment 6 As shown in FIG. 7, the diameter of the large diameter portion of the truncated conical cylinder 10 is set to be approximately the same as the diameter of the coil bobbin 7, and at the position of the nodal circle of the primary resonance mode VIO of the flat plate diaphragm 5, A coil bobbin 7 and a truncated conical cylinder 10 are bonded together.

In this way, when the coil bobbin 7 and the truncated conical cylinder 10 are attached to the position of the nodal circle of the primary resonance mode VIO of the flat plate diaphragm 5, the coil bobbin 7 and the truncated conical cylinder 10
This has the advantage that the diameter of the nodal circle does not change depending on the mass of the nodal circle.

The present invention has the above-described configuration, and has the following advantages.

(1) Since the flat diaphragm is supported by a sub-damper in addition to the damper, the number of support points increases, the supporting force becomes stronger, and the horizontal vibration of the flat diaphragm becomes less likely to occur.

(2) Since the flat plate diaphragm side uses a large-diameter truncated conical cylinder and the sub-damper side uses a small-diameter truncated conical cylinder, the resistance to torsion is higher than when using a simple cylinder, the supporting force is strong, and the lateral Great anti-shake effect.

(3) The support point of the sub-damper can be set apart from the flat diaphragm, and the diaphragm can be stably supported.

(4) When a small-diameter cylinder is connected to the small-diameter side of a truncated conical cylinder and this cylinder is supported by one or more sub-dampers, the additional mass should not be increased too much. Without,
The support point can be provided further away from the flat diaphragm, and the effect of preventing rolling can be enhanced.

(5) Since a truncated conical cylinder is used, standing waves are less likely to be generated inside the cylinder, and deterioration in sound quality due to the generation of standing waves can be prevented.

(6) Due to the above (1) to (5), the horizontal vibration of the flat diaphragm is less likely to occur, so that the input resistance characteristics are improved.

(7) When the large diameter part of the truncated conical cylinder is fixed to the nodal circle of the primary resonance mode VIO of the flat plate diaphragm, the nodal circle may change depending on the mass of the truncated conical cylinder. do not have.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a conventional speaker, FIG. 2 is a sectional view of a speaker according to one embodiment of the present invention, and FIGS. 3 to 7 are sectional views of other embodiments of the present invention. 1...Yoke, 2...Magnet, 3
...Yoke, 4...Frame, 5...
...Flat plate diaphragm, 6...Edge member, 7.
... Coil bobbin, 8 ... Voice coil, 9 ... Damper, 10 ... truncated conical cylinder, 11.11' ... Sub-damper, 12...
...Cylindrical body.

Claims (3)

[Scope of utility model registration request] (1) A magnetic circuit having an annular magnetic gap, a flat plate diaphragm supported by a frame via an edge member, a coil bobbin fixed inside the cylinder of the primary resonance mode of the diaphragm, and a coil bobbin wound around the coil bobbin. a voice coil that is rotated and placed in the magnetic gap, a damper that supports the coil bobbin, a truncated conical cylinder whose large diameter side is fixed to the flat diaphragm, and a small diameter or A speaker comprising: a sub-damper that supports the cylindrical body coupled to the small diameter side of the truncated conical cylindrical body. (2) Utility model registration The speaker according to claim 1 is connected to the small-diameter side of the truncated conical cylinder using a magnetic circuit having a through hole formed in the center and an annular magnetic gap. A cylindrical body is inserted into a through hole of the magnetic circuit, and the cylindrical body is supported by a sub-damper. (3) Utility Model Registration Scope of the Claims In the speaker according to claim 1, the diameter of the large-diameter portion of the truncated conical cylinder is approximately the same as the diameter of the coil bobbin, and the large-diameter side of the truncated conical cylinder and the coil bobbin A speaker that is fixed inside a cylinder in the primary resonance mode of a flat diaphragm.