JPS5837192Y2 - electrodynamic speaker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrodynamic speaker, particularly the structure of a lead extraction portion.

As shown in Figure 1, the electrodynamic speaker has pole piece 1.
A vibrating membrane 3 is installed in a magnetic circuit consisting of a yoke 2 and a yoke 2,
Voice coil 4 made of printed foil provided on this diaphragm
Sound is emitted by passing an audio current between both ends of the .

The structure of the vibrating membrane 3 is as shown in Figs. 2 to 4. First, the vibrating membrane 3 having a voice coil 6 made of aluminum foil printed flat on an insulating film 5 made of polyimide or the like is stretched evenly. It is adhered to the vibrating membrane ring 7 while maintaining tension.

Next, an insulating plate 12 having a conductor portion 10.11 is adhered to a portion close to both ends 8, 9 of the voice coil 6, and after ultrasonically soldering both ends 8, 9 of the voice coil 6, the conductor portion of the insulating plate 12 is Solder to 10°11.

Furthermore, the lead wire 13 is soldered to the conductor part 10.11,
Lead to the outside.

In other words, soldering is performed three times in total.

FIG. 4 is a cross section of the ultrasonic soldering section of FIG. 3.

At this time, the voice coil 6 is first soldered, and then the conductor part 10.11 of the insulating plate 12 is ultrasonic soldered, but the level difference between the surface of the voice coil 6 and the conductor part 10. 1mm, conductor part 10.11 with only solder 14
Since the amount of solder 14 varies, there is a possibility that the solder may open during a vibration test, be destroyed when a large input is applied, or cause defects such as sticky solder or tunnel solder. Yes, there are reliability problems.

Furthermore, as mentioned above, soldering must be performed three times, resulting in poor workability.

Therefore, it is an object of the present invention to provide a speaker that eliminates these drawbacks.

An embodiment of the present invention will be described below with reference to FIGS. 5 to 7.

In FIG. 5, first, an insulating film 15 such as polyimide is
A voice coil 16 made of printed foil such as aluminum is provided in a flat shape, the film 15 is stretched evenly, and the film 15 is bonded to the vibrating membrane ring 17 while maintaining the evenly stretched state.

Next, a thin insulating plate 20 having conductor portions 21.22 is bonded to the voice coil 16 in the vicinity of both ends 18.19.

The insulating plate 20 is made of polyimide or the like and has a thickness of about 25 μm, and the conductor portions 21 and 22 are made of printed copper foil and have a thickness of about 35 μm.

In other words, it is a 60μ board, has considerable flexibility, and may be generally referred to as a flexible printed circuit board.

Taking advantage of this flexibility, the insulating plate 21 is shaped to have portions 23 and 24 corresponding to the lead wires of the speaker.

In this way, as shown in FIG.
The height is approximately 60μ (0.06mm) from the conventional 1mm.
Therefore, the step difference is about 1/17, so the conductor part 1 is soldered after ultrasonic soldering to the voice coil 6 as in the conventional method shown in Fig. 4.
0.11 and then the lead wire 13, the printed voice coil 16 and the conductor portions 21 and 22 of the insulating plate 20 only need to be soldered once, as shown in Figure 6. The number of defective parts is reduced and workability is improved.

Furthermore, the amount of solder 31 is more stable than in the past, so soldering by vibration tests does not cause defects due to opening of parts, breakage during adult force, and defects in soldering such as potato soldering and tunnel soldering.

A hole 25.26 is provided at the tip of the portion 23.24 corresponding to the lead wire of the insulating plate 20, and a conductor portion 27.28 is provided around this hole 25.26.
．． 26 through the terminal 29.30 provided on the speaker housing, and connect the conductor portion 27.28 around the hole 25.26 to the terminal 2.
9.30 should be soldered.

At this time, the conductor portions 27 and 28 around the insulating plate 20 may be made through holes as shown in FIG. 7 so that they can be soldered from both sides of the insulating plate 20.

This also improves soldering reliability.

Further, the copper surfaces of the portions 23 and 24 corresponding to the lead wires are preferably protected with a solder resist or the like to prevent short circuits and corrosion.

Of course, the direction and length of the portions 23 and 24 corresponding to the lead wires can be freely adjusted depending on the positions of the terminals 29 and 30.

As described above, according to the present invention, it is possible to obtain an electrodynamic speaker that is easy to connect the lead wire portion to the voice coil, is easy to manufacture, and has excellent reliability.

[Brief explanation of the drawing]

Figure 1 is a perspective view of the main parts of a conventional electrodynamic speaker, Figure 2 is an exploded perspective view of a part of it, Figure 3 is a perspective view of it, Figure 4 is a sectional view of a part of it, and Figure 5. 6 and 7 are exploded perspective views of essential parts of an electrodynamic speaker according to an embodiment of the present invention.
The figure is a cross-sectional view of a part thereof. 15... Insulating film, 16... Voice coil, 18° 19... Both ends of voice coil, 20... Insulating plate, 21° 22... ... Conductor part, 23.24 ... Part corresponding to the lead wire.

Claims (1)

[Scope of utility model registration request] A vibrating membrane having a voice coil printed flat on an insulating film surface is installed in two parallel magnetic gaps consisting of a yoke and a pole piece so that the entire surface of the vibrating membrane is driven, A thin insulating plate having a conductor part for a lead wire is adhered close to the terminal part at both ends of the printed foil of the voice coil, and the terminal part of the voice coil and the conductor part of the insulating plate are connected to insulate the voice coil. An electrodynamic speaker in which the conductor part of the plate serves as a lead wire for the boil coil.