JPS589436Y2 - speaker unit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a speaker unit having a back cover that suppresses frame resonance and provides good reproduction characteristics.

In general, in a moving coil type cone speaker, a cone linked to the voice coil vibrates in response to an electrical signal applied to the voice coil, thereby emitting sound waves.

FIG. 1 is a cross-sectional view showing an example of this type of speaker unit. In the figure, 1 is a ring-shaped magnet with a through hole formed in the center, and 2 is a center pole disposed within the through hole of the magnet 1.

Reference numeral 3 denotes a voice coil in which a coil 3b is wound around a bobbin 3a that is arranged around the outer periphery of the center pole 2 so as to be movable forward and backward.

Furthermore, 4 is a top yoke provided on the upper surface of the magnet 1 and facing the voice coil 3 with a predetermined magnetic gap therebetween.

Above magnet 1, center pole 2, top yoke 4
constitute a magnetic circuit.

5 is a substantially conical cone whose neck at the center of the rear end is fixed to the bobbin 3a and whose outer periphery at the front end is held on the frame 6 via an edge, and 7 is between the bobbin 3a and the base of the frame 60. The stretched damper 8 is a center cap provided at the center of the cone 5 for dust prevention and the like.

The base end of the frame 6 is fixed to the top yoke,
In addition, the outer periphery of the flange-shaped tip is fixed to a speaker box (not shown) or the like.

Reference numeral 9 denotes a back cover that is attached to the back side of the speaker unit, forms a sealed chamber on the back side of the cone 5, and blocks sound waves radiated to the back side.

However, in such a speaker unit, the cone 5
The damper etc. also vibrate due to the vibration, and the frame 6, the magnetic circuit, etc. also vibrate to some extent.

The magnetic circuit consists of the magnet 1, the center pole 2, and the top yoke 4, and therefore has a heavy specific gravity, making it difficult to resonate.However, since the frame 6 is generally light, resonance occurs, which influences the reproduction characteristics of the speaker unit.

Conventionally, a die-cast frame is considered to be more effective than a steel plate frame for suppressing such resonance of the frame 6, but even if a die-cast frame is used, it is difficult to suppress frame resonance effectively. there were.

The present invention was developed in view of the above circumstances, and the object is to provide a speaker unit that can effectively suppress frame resonance with a simple structure and thereby obtain good reproduction characteristics. It is.

Hereinafter, one embodiment of the present invention will be described in detail with reference to a sectional view shown in FIG. 2, in which the same parts as in FIG. 1 are denoted by the same reference numerals.

In the figure, reference numeral 11 denotes a bottomed cylindrical body whose bottom surface is attached by a center pole 2 to a screw 12 with a back cover.

The opening of the back cover 11 is fitted into and held by the outer peripheral end of the frame 6, that is, the stepped portion of the flange-like tip.

Furthermore, this back cover 11 is shaped so as to be in close contact with the middle part of the frame 6, that is, the approximately central part between the flange-like tip and the base end fixed to the top yoke 4, and this part is fixed to the frame 6 with screws 13 or the like. I try to do that.

With such a configuration, the cone 5 can be driven in accordance with the signal given to the voice coil 3 to emit sound waves.

Since the middle part of the sludge frame 6 is held by the bank cover 11, it is mechanically reinforced and has a strong and sturdy structure, which effectively suppresses resonance with the vibration of the cone 5, which is good. It is possible to obtain excellent playback characteristics.

As described in detail above, in the present invention, the bank cover is closely attached to the middle part of the frame holding the cone and fixed to this part.

Therefore, the mechanical strength of the frame can be increased, resonance of the frame due to vibration of the cone can be suppressed, and a speaker unit with good reproduction characteristics can be provided.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing an example of a conventional speaker unit, and FIG. 2 is a cross-sectional view showing an embodiment of the present invention. 1... Magnet, 2... Center pole, 3... Voice coil, 4... Top yoke, 5... Cone, 6... ...Frame, I...Damper 8...Center cap, 11...Back cover.

Claims (1)

[Scope of utility model registration request] A cone that has a substantially conical shape that spreads forward and functions as a diaphragm that emits sound waves, a voice coil that is fixed to the rear end of this cone so as to protrude rearward, and a cone that corresponds to the voice coil and is configured as described above. A magnetic circuit section for driving the cone via the voice coil, and a base end fixed to the magnetic circuit section and a distal end formed in a flange shape to hold the cone in a predetermined position on the magnetic circuit section. a frame that supports the rear end of the cone via a damper on an inner periphery near the base end and supports the front end of the cone via an edge on the inner periphery of the distal end; A speaker unit has a back cover having an open end fixed to the M part and sealingly covering the rear part of the frame including the magnetic circuit part, and the back cover is attached to the central part of the back surface of the magnetic circuit part and the back part of the frame. A speaker unit characterized in that the speaker unit is configured to be closely fixed to approximately the center portion of both ends.