JPH039438Y2 - - Google Patents

Description

[Detailed explanation of the idea] (b) Industrial application fields The present invention relates to a flat speaker.

(b) Prior Art As shown in Japanese Utility Model Publication No. 57-37593, a conventional flat speaker generally has the configuration shown in FIG. 1 or 2. That is, the flat speaker shown in FIG. 1 has a voice coil bobbin 2 connected to a magnetic gap of a magnetic circuit 1.
A voice coil 3 is inserted at the lower end of the bobbin 2, and a plane diaphragm 4 is connected to the upper end of the bobbin 2.
A peripheral edge 5 of this diaphragm 4 is secured to an opening in a frame 6 mounted on the magnetic circuit 1.

In addition, 7 is a damper that straddles the voice coil bobbin 2 and the frame 6, 8 is an insulating terminal plate attached to the frame 6, and the lead wire 9 from the voice coil 3 is connected to the input terminal on the terminal plate 8. 10 by soldering.

On the other hand, the difference between the flat speaker in FIG. 2 and that in FIG. 1 is that the voice coil bobbin 2 and the flat diaphragm 4 are
A cone-shaped vibration transmission member 11 is interposed between the two, and the nodal position of the flat diaphragm 4 is driven by the large diameter portion of the upper end of the vibration transmission member 11.

However, such conventional planar speakers are
As shown in FIG. 1, the voice coil bobbin 2 and the flat diaphragm 4 are orthogonally joined, which makes it difficult to accurately position the joint, and as shown in FIG. 2, the voice coil bobbin 2 and the flat diaphragm 4 If another vibration transmitting member 11 is inserted between the vibration transmitting member 11 and these are connected and joined, the number of vibration system components increases;
Since a complicated process is required for positioning these, accurate positioning is still difficult.

Therefore, in any conventional speaker, when assembling the vibration system by adhesive, it is difficult to accurately align and angle the diaphragm 4 and the voice coil bobbin 2, so the mounting angle of the voice coil bobbin 2 is oblique. At times, there was a risk that the voice coil 3 would come into contact with the wall surface of the magnetic gap of the magnetic circuit 1 while the voice coil 3 was vibrating, causing abnormal noise.

On the other hand, attachment of small parts such as the terminal plate 8 and management of the parts pose problems, and these problems hinder rationalization of speaker assembly and reduction of manufacturing costs.

(c) Purpose of the invention This invention was made for the purpose of eliminating the above-mentioned drawbacks.
To provide a flat speaker that enables accurate positioning of a voice coil bobbin and prevents the generation of abnormal noise, while streamlining the assembly of a terminal plate and reducing manufacturing costs.

(d) Structure of the invention The flat speaker of the invention is provided with a guide plate that connects and fixes the middle part of the voice coil bobbin and the frame to which the periphery of the diaphragm is locked, and extends from the guide plate to the outside of the frame. The existing tongue piece is also used as a terminal board for input terminals.

(E) Embodiment FIG. 3 shows an embodiment of the flat speaker of the present invention. In the same figure, 1 to 11 are in Figure 1 and 2.
Like the conventional loudspeaker shown in the figure, the magnetic circuit to vibration transmission member is shown, and basically it belongs to the nodal drive type planar loudspeaker shown in FIG. The difference between the speaker according to the embodiment of the present invention and the one shown in FIG. 2 is that a guide plate 12 is provided between the voice coil bobbin 2 and the frame 6, and a terminal plate 120 for input terminals is provided from the guide plate 12. It is located at the point where it is extended.

That is, the guide plate 12 is a punched and molded body made of, for example, insulating Bakelite, hard paper, fiber, etc., and as shown in FIG. A frame ring part 122 that is fitted and placed on the inner wall stepped part 60 of the frame 6 is concentrically connected by four bridge parts 123. Moreover, at a part of the outer periphery of the frame ring portion 122 of this guide plate 12, a tongue-shaped terminal plate 120 to which two input terminals 10 are fixed with rivets extends outward from the opening of the frame 6. Currently being formed.

In such a planar speaker, the voice coil bobbin 2 is installed and positioned in the magnetic gap of the magnetic circuit 1 using a gap gauge, and the damper 7 and the guide plate 12 are attached to the bobbin 2. The outer periphery of the frame 6 and the inner periphery of the damper 7 and the voice coil bobbin 2 are fixed by adhesive, and the frame ring part 122 of the guide plate 12, the stepped part 60 of the frame 6, and the bobbin of the guide plate 12 are fixed to each other by adhesive. The voice coil bobbin 2 is fixed to the ring portion 121 using an adhesive. At this time, the terminal plate 120 integrally formed with the guide plate 12 is made to protrude outside from the side window of the frame 6, and the lead wire 9 of the voice coil 3 led out along the voice coil bobbin 2, 9 is pulled out from the opening of this frame 6 and connected to the input terminals 10, 10 of the terminal board 120.
are soldered together.

As mentioned above, the gap gauge in the magnetic gap is removed with the voice coil bobbin 2, damper 7, and guide plate 12 fixed to each other. The voice coil bobbin 2 remains centered at , and the voice coil bobbin 2 does not move in any direction. Therefore, in this state, the diaphragm 4 is fixed to the upper end of the voice coil bobbin 2 with an adhesive at the correct position and angle via the vibration transmission member 11, and the edge 5 on the outer periphery of the flat diaphragm 4
is adhesively fixed to the opening of the frame 6.

Therefore, after the vibration systems of the flat speakers are completely adhesively fixed while maintaining accurate positioning as described above, by cutting out the four bridge parts 123 of the guide plate 12, respectively. ,
Due to the self-alignment of the diaphragm 4 and the damper 7, only vibration in the direction of the central axis of the vibration system is allowed, and gap rubbing of the voice coil 3 is extremely suppressed. Furthermore, the bridge portion 1 of this guide plate 12
23... will be cut by inserting a cutting tool such as nippers through the side window of the frame 6.

The above-mentioned speaker according to the embodiment of the present invention has a terminal plate 1.
20 is formed integrally with the guide plate 12, and if the lead wires 9, 9 from the voice coil 3 are soldered and connected to the terminals 10, 10 of this terminal plate 120 in advance, the components can be further separated. This can contribute to reducing assembly man-hours.

(f) Effects of the invention As is clear from the above explanation, the planar speaker of the invention is provided with a guide plate that connects and fixes the middle part of the voice coil bobbin and the frame to which the periphery of the diaphragm is locked. Since the tongue extending from the guide plate to the outside of the frame also serves as a terminal plate for the input terminal, this guide plate allows accurate positioning of the voice coil, and the gap Abnormal noises such as pickpocketing are completely eliminated. Furthermore, since the terminal plate is integrated with the guide plate, these parts can be easily managed and handled, and assembly can be streamlined and manufacturing costs can be reduced.

[Brief explanation of drawings]

FIGS. 1 and 2 are sectional views of different conventional flat speakers, FIG. 3 is a sectional view of an embodiment of the flat speaker of the present invention, and FIG. 4 is a perspective view of essential parts of the embodiment speaker of FIG. 3. It is a diagram. 1...Magnetic circuit, 2...Voice coil bobbin,
3...Voice coil, 4...Plane diaphragm, 6...
Frame, 9... Leader line, 12... Guide plate, 1
20...Terminal board.

Claims (1)

[Scope of utility model registration request] In a flat speaker in which a flat diaphragm is connected directly or indirectly through a vibration transmission member to a voice coil bobbin in which a voice coil is arranged in a magnetic gap of a magnetic circuit, the middle part of the voice coil bobbin and the periphery of the diaphragm A guide plate having a section that can be cut off after assembly is used to connect and fix the frame to which it is locked, and the tongue extending from the guide plate to the outside of the frame also serves as a terminal plate for input terminals. A flat speaker characterized by: