JP4598435B2 - Speaker - Google Patents

Description

  The present invention relates to a thin speaker.

When a speaker is incorporated in a thinned device, the speaker is also required to be thin. In particular, when this apparatus is a thin television using a liquid crystal panel or the like, the thickness of the thin television is inevitably reduced. When a speaker is incorporated into such a thin device, a thin speaker is particularly required. Furthermore, in a device such as a thin television, speakers are arranged on both sides of the liquid crystal panel, so that a speaker having an elongated shape is required. Some speakers used in such devices have a plurality of magnetic circuits (Patent Document 1).
Japanese Patent Laid-Open No. 10-327491

  When making a conventional speaker thin, there are the following problems. The conventional speaker has a conical shape of the diaphragm, a voice coil attached to the bottom of the diaphragm, a damper attached to the voice coil, and a damper in order to achieve high input resistance and secure reproduction frequency band. Is provided between the diaphragm and the magnetic circuit. Because of this structure, that is, a structure having a damper between the diaphragm and the magnetic circuit, it is difficult to reduce the thickness of the speaker for incorporation into a thin apparatus such as a liquid crystal television.

  Further, in the speaker described in Patent Document 1, since the diaphragm has a planar shape, it is not possible to achieve high input resistance and secure a reproduction frequency band.

  An object of the present invention is to provide a loudspeaker that can solve the above-described problems, can be thinned, can achieve high input resistance, and can secure a reproduction frequency band.

In order to solve the above-described problem, in the present invention, an elongated rectangular frame 1 and a track-shaped diaphragm 2 provided in the frame 1 so as to vibrate via a support member 2A along the length direction thereof. And magnetic circuits 4 and 5 provided at both ends in the longitudinal direction of the diaphragm 2 and provided on the bottom side of the frame 1, respectively. The magnetic circuits 4 and 5 include yokes 4A and 5A. consists yoke 4A, 5A of the outer peripheral wall of the ring-shaped, which is provided at the front end magnets 4C, and 5C, the magnet 4C, the ring-shaped plate 4B provided at the front portion of 5C, and 5B, the plate 4B, 5B the yoke 4A and the inner circumferential surface, a magnetic gap between the main body outer peripheral surface substantially forms a cylindrical 5A is formed of a coil portion 6B of the voice coil 6, 7, 7B are provided in the magnetic gap, the voice Bobbin 6A of the coil 6, the front end of 7A is fixed to the diaphragm 2, the voice coil 6 and through the diaphragm 2 is supported by da damper 3, met between the magnetic circuits 4 and 5 central portion Te is the bottom portion 2B of the to the diaphragm 2, such a conical shape attached to the center portion of the damper 3 provided at the bottom side of the frame 1, the outer peripheral portion of the damper 3 is the magnetic circuits 4 and 5 said plate 4B of, secured to the bottom side of the frame 1 located 5B front, a speaker, characterized in that.

According to the present invention, even a speaker having a plurality of magnetic circuits, the damper is provided on the inner side of the magnetic circuit and the voice coil, since the support with damper via the vibration plate, to allow thinner In addition, sufficient amplitude, high input resistance, and reproduction frequency band can be ensured.

  Next, the best mode for carrying out the present invention will be described with reference to the drawings. FIG. 1 is a plan view showing the speaker according to the present embodiment, and FIG. 2 is a cross-sectional view showing a II cross section of FIG. 3 is a cross-sectional view showing a II-II cross section of FIG. This speaker includes an elongated frame 1. The frame 1 is provided with a recess having a track-shaped first opening 1A. In the center of the bottom of the recess, a circular second opening 1B and circular third openings 1C and 1D sandwiching the second opening 1B are opened along the longitudinal direction of the frame 1. ing. In addition, 1E of FIG. 1 is an attachment hole for attaching a speaker.

A diaphragm 2 is attached to the first opening 1 </ b> A of the frame 1. That is, the edge portion of the support 2 </ b> A of the diaphragm 2 is attached to the edge portion of the first opening 1 </ b> A of the frame 1. Diaphragm 2 is a cone-shaped central portion, a circular bottom portion 2B on the edge after the conical shape is attached to the central portion of the damper 3. In the speaker according to the present embodiment, the diaphragm 2 has a conical shape so that the overall height of the diaphragm 2 is increased. Circular attachment holes 2C and 2D are formed in the portion of the diaphragm 2 facing the third openings 1C and 1D of the frame 1.

  The periphery of the center portion of the damper 3 is processed into an uneven shape. The edge portion of the damper 3 is attached to the edge portion of the second opening 1B of the frame 1. In other words, the movable portion of the damper 3 is attached to the bottom portion 2 </ b> B of the diaphragm 2 and is disposed on the rear surface side of the diaphragm 2.

A magnetic circuit 4 is attached to the third opening 1 </ b> C of the frame 1. The magnetic circuit 4 includes a cylindrical yoke 4A, and includes a plate 4B and a magnet 4C around the yoke 4A. A gap is formed between the plate 4B and the magnet 4C and the yoke 4A. Similarly, a magnetic circuit 5 including a yoke 5A, a plate 5B, and a magnet 5C is attached to the third opening 1D of the frame 1. The magnetic circuit 5 is the same as the magnetic circuit 4. The magnetic circuits 4 and 5 are attached to the bottom of the frame 1, and the damper 3 is similarly attached to the bottom of the frame 1. That is, in the loudspeaker according to the present embodiment, the damper 3 is provided on the inner side of the magnetic circuit 4 and 5, and has a movable part of the damper 3 is attached to the bottom portion 2B of the diaphragm 2 structure.

A bobbin 6 </ b> A of a cylindrical voice coil 6 is fixed in a mounting hole 2 </ b> C formed in the front surface of the diaphragm 2, and the coil portion 6 </ b> B of the voice coil 6 is inserted into the gap of the magnetic circuit 4. Front end of the bobbin 6A located on the vibration plate 2 side is closed by a cap 6C. Similarly, the bobbin 7 </ b> A of the voice coil 7 is fixed to the mounting hole 2 </ b> D of the diaphragm 2, and the coil portion 7 </ b > B of the voice coil 7 is inserted into the gap of the magnetic circuit 5. The front end of the bobbin 7A located on the vibration plate 2 side is closed by a cap 7C. These two voice coils 6 and 7 are driven by the magnetic circuits 4 and 5 to vibrate the diaphragm 2.

  The speaker according to the present embodiment has the above-described configuration. According to this configuration, since the damper 3 is not attached to the bobbin of the voice coil as in the prior art, it is not necessary to take a vibration space under the damper 3 and the speaker can be made thin.

Further, according to this configuration, since the damper 3 is provided on the inner side of the magnetic circuits 4 and 5, it is possible to use the thickness of the magnetic circuits 4 and 5 as a space in which the damper 3 is vibrated, thin speaker Can be.

  Furthermore, according to this configuration, the rigidity of the shape can be obtained by increasing the overall height of the diaphragm 2, high input resistance can be realized, and a reproduction frequency band can be secured.

  The embodiment of the present invention has been described in detail above, but the specific configuration is not limited to the present embodiment, and the present invention can be applied even if there is a design change or the like without departing from the gist of the present invention. included.

It is a top view which shows the speaker by embodiment of this invention. It is sectional drawing which shows the II cross section of FIG. It is sectional drawing which shows the II-II cross section of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Frame 1A 1st opening 1B 2nd opening 1C, 1D 3rd opening 1E Mounting hole 2 Diaphragm 2A Support material 2B Bottom part 2C, 2D Mounting hole 3 Damper 4, 5 Magnetic circuit 4A, 5A Yoke 4B, 5B Plate 4C, 5C Magnet 6, 7 Voice coil 6A, 7A Bobbin 6B, 7B Coil part 6C, 7C Cap

Claims (1)

An elongated rectangular frame (1);
In this frame (1), a track-shaped diaphragm (2) provided so as to vibrate via a support member (2A) along its length direction;
Magnetic circuits (4), (5) provided at both ends in the longitudinal direction of the diaphragm (2) and provided on the bottom side of the frame (1),
With
The magnetic circuits (4) and (5) include a yoke (4A) and (5A), and ring-shaped magnets (4C) and (5C) provided at the front ends of the outer peripheral walls of the yokes (4A) and (5A). And ring-shaped plates (4B) and (5B) provided in front of the magnets (4C) and (5C),
Said plate (4B), the magnetic gap is formed between the main body outer peripheral surface substantially forms a cylindrical (5B) inner peripheral surface and the yoke (4A), (5A),
This magnetic gap is provided with coil portions (6B) and (7B) of voice coils (6) and (7),
The voice coil (6), the bobbin (6A), the front end of (7A) is fixed to said vibrating plate (2), a voice coil (6), the diaphragm (7) (2) (7) through and supported by da damper (3),
The magnetic circuit (4), (5) between the A and the central portion conical shape such to the diaphragm (2) of the bottom portion (2B) is the damper provided at the bottom side of the frame (1) (3 Is attached to the center of
The outer peripheral portion is the magnetic circuit of the damper (3) (4), (5) the plate (4B) fixed to the bottom side of the (5B) the frame located on the front (1),
A speaker characterized by that.

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