JPH0346898A - Dynamic speaker - Google Patents

Abstract

PURPOSE:To control the compliance of a neck part formed at the border between a dome part and a cone part by coupling the upper end of a voice coil fitted in the magnetic gap of a magnetic circuit with the neck part, which is formed in an inverted V shape with several holes by uniting the cone part with the periphery of the dome part provided in the center, by using an adhesive and coupling the peripheral edge part of the diaphragm with a frame coupled with a magnetic circuit. CONSTITUTION:The frame 19 made of synthetic resin, etc., is coupled with the magnetic circuit 14 and the peripheral edge part of the diaphragm 23 which has the dome part 20 in the center and has the cone part 22 formed at the peripheral edge part of the dome part 20 through the neck part 21 in the inverted V shape is coupled with the upper end part of the frame 19. The upper end of a voice coil 24 is coupled with the neck part 21 of the diaphragm 23 with the adhesive 25. The lower end of the voice coil 24 is fitted in the magnetic gap 26 of the magnetic circuit 14 without being eccentric.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an electrodynamic Nubby force used in various types of audio equipment.

BACKGROUND ART Conventional electrodynamic speakers have been constructed as shown in FIGS. 6 and 7.

That is, a ring-shaped magnet 3 and a ring-shaped upper plate 4 are laminated and bonded on a plate 2 having a center pole 1 to form an external magnetic type magnetic circuit 6, and a frame is bonded on this magnetic circuit ε. 6, the peripheral part of a diaphragm 9 having a dome part 7 in the center and a cone part 8 integrally formed around the dome part 7 is joined to the boundary between the dome part 7 and the cone part 8 of this diaphragm 9. The upper end of the poise coil 10 was connected to the lower part of the voice coil 10, and the lower part of the voice coil 10 was fitted into the magnetic gap 11 of the magnetic circuit 6.

The connection between the diaphragm 9 and the poise coil 1Q is as shown in FIG.
The configuration was such that the adhesive 12 was used to bond to the peripheral edge, or the adhesive 12 was used to bond to the rising portion of the cone portion 8 as shown in FIG.

Problems to be Solved by the Invention However, in the above structure, that is, the structure shown in FIG. ? However, the driving force of the Voice Coil A/10 is not transmitted accurately, and the compliance is determined by the rigidity of the material of the diaphragm 9 and the thickness of the material due to the molding state, resulting in an electrodynamic speaker with the desired characteristics. It had become impossible.

Furthermore, in the configuration shown in FIG. 7, since the neck portion 13 is located inside the joint portion of the poise coil 1o, the driving force of the poise coil 1o cannot be accurately transmitted to the dome portion 7. It was not possible to realize the electrodynamic type NUBICA with the characteristics.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned conventional drawbacks and to provide an electrodynamic noupika in which the compliance of the neck formed at the boundary between the dome and the cone can be controlled.

Means for Solving the Problems In order to solve the above problems, the present invention provides a diaphragm in which a cone part is integrally formed around a dome part provided at the center, the upper end of a poise coil fitted into a magnetic gap of a magnetic circuit. The neck part, which is formed at the boundary between the dome part and the cone part, is shaped like an inverted V and has holes in several places, and the peripheral part of the three diaphragms is connected to the frame by using adhesive, and the peripheral part of the three diaphragms is connected to the magnetic circuit. The configuration is such that they are combined.

Effect With the above configuration, the compliance of the neck between the dome and cone of the diaphragm to which the poise coil is coupled can be freely controlled by the number of holes and the adhesive, and the desired characteristics can be adjusted. Den-type Nubica will become a reality.

Embodiment Two embodiments of the present invention will be described below with reference to the accompanying drawings, FIGS. 1 to 4.

Reference numeral 14 denotes an external magnetic type magnetic circuit, which is constructed by laminating and bonding a ring-shaped magnet 1a and a ring-shaped upper plate 18 on a plate 16 having a center ball 16. Although this magnetic circuit 14 shows an example of an external magnetic type,
It is also possible to use an internal grinding type, which is constructed by incorporating a columnar magnet and an upper plate into a pot-shaped yoke.

A frame 19 made of synthetic resin or the like is connected to the magnetic circuit 14, and the upper end of the frame 19 has a dome portion 2Of in the center, and an inverted V-shaped portion on the periphery of the dome portion 2o. Cone portion 22 via neck portion 21
The periphery of the diaphragm 23 formed with the diaphragm 23 is joined together. The upper end of the poise coil 24 is bonded to the neck portion 21 of the diaphragm 23 with an adhesive 26, and the lower portion of the poise coil 24 is fitted into the magnetic gap 26 of the magnetic circuit 14 without eccentricity.

To connect the diaphragm 23 and the poise coil 24, holes 27 are provided at several locations in the neck portion 21 of the diaphragm 23, as shown in FIGS. 26 also flows out to the upper surface of the neck portion 21 and solidifies, thereby lowering the compliance of the neck portion 21. FIG. 2 is a view of the diaphragm 23 viewed from above, showing an example in which four holes 271f are provided in the neck portion 21, and FIG. FIG. 4 shows a cross-sectional view of the portion in which the hole 27 is provided.

By increasing the number of holes 27, the strength of the neck portion 21 can be increased. The compliance of the neck part, which was determined by conditions, can be controlled by the number of holes formed in the neck part, and any characteristics, especially the frequency characteristics in the high range, can be completely controlled.The simple configuration makes it a big burden on construction methods. Not.

It does not require a large amount of adhesive and is of great industrial value.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of the electrodynamic Nupica of the present invention, FIG. 2 is a top view of the same essential parts, and FIG. FIG. 4 is a cross-sectional view of the Moom and B--B in FIG. 2, FIG. 6 is a cross-sectional view of a conventional electrodynamic speaker, and FIGS. 6 and 7 are cross-sectional views of the same essential parts. 14... Magnetic circuit, 19... Frame, 20... Dome part, 21... Neck part, 22... Cone part, 23 ... Vibration plate, 24 ... Poise coil, 26 ... Adhesive, 26 ... Magnetic gap, 27 ... Hole.

Claims (1)

[Claims] The upper end of the poise coil fitted into the magnetic gap of the magnetic circuit is connected to several places in an inverted V shape formed at the boundary between the dome and cone parts of the diaphragm, which has a cone integrally formed around a dome in the center. An electrodynamic speaker comprising: a neck portion having a hole in the diaphragm connected to the frame using an adhesive; and a peripheral portion of the diaphragm connected to a frame connected to the magnetic circuit.