JPH04369999A - Speaker unit - Google Patents

Abstract

PURPOSE:To surely fix a diaphragm, a spider, and a voice coil to a voice coil bobbin even under the high temperature environment and to prevent the dislocation and omission between these. CONSTITUTION:On the outer circumferential surface of a voice coil bobbin 8 to which a voice coil 8a, a diaphragm 9 and a spider 7 are fitted, a pair of upper and lower projections 13 for through-fixing to sandwich it is provided so as to be positioned at the bonding place itself to be fitted, and by using these projections 13 for through-fixing, the desired voice coil 8a, the diaphragm 9 and the spider 7 are bonded and positioned between them, and the omission under the high temperature environment is prevented.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a means for attaching a voice coil, a diaphragm, and a spider to a voice coil bobbin in a speaker unit used in a high-temperature environment.

0002

2. Description of the Related Art FIG. 3 is a vertical cross-sectional view showing a conventional cone-shaped speaker unit. A magnet, (3) is a pole piece fixed on this magnet, (4) is a top plate fitted into the opening of the yoke (1), and the pole piece (3) and this top plate (4) and form a magnetic gap (5). (6) is a frame fixed on the top plate (4), (7) is a spider whose outer peripheral edge is supported by this frame, and (8) is held by the inner peripheral edge of this spider and has a magnetic gap (5). The voice coil bobbin (8a) inserted into the voice coil bobbin (9a) is the voice coil wound around the bobbin (9a).
) has an outer peripheral edge overlapped with the opening edge of the frame (5),
The inner peripheral edge is a diaphragm attached to the voice coil bobbin (8), (9a) is the edge, and (10) is the diaphragm (
9) is a dust cap attached to the center of the screen.

FIG. 4 is an enlarged vertical sectional view of the voice coil bobbin portion of the conventional speaker unit, in which the voice coil (8a) is wound around the voice coil bobbin (8) and is bonded with varnish (12). The voice coil bobbin (8) and the diaphragm (9) and the voice coil bobbin (8) and the spider (7) are both bonded together with an adhesive (11).

As described above, in the conventional cone-shaped speaker unit, the voice coil bobbin (8), the diaphragm (9)
and spider (7) are fixed with adhesive (11), and adhesive varnish (12) is attached to voice coil bobbin (8).
) is applied to the conductive wire and wound and glued while applying a solvent to form the voice coil (8a). The voice coil bobbin (8) is made of Al or polyimide film, and is punched out into a rectangular shape and formed into a cylindrical shape, on which the voice coil is wound.

[0005]

[Problem to be Solved by the Invention] Since the conventional cone-shaped speaker unit is constructed as described above, there were no particular problems in the normal usage environment (around 20 degrees Celsius).
For example, when used in a high temperature environment of 160°C, such as in an exhaust duct, the adhesive strength between the voice coil bobbin (8) and the diaphragm (9), and between the voice coil bobbin (8) and the spider (7) weakens, and the diaphragm (9), The spider (7) may become misaligned with the voice coil bobbin (8), or the voice coil (8a)
) would fall off.

The present invention has been made to solve the above-mentioned problems, and it is possible to maintain the diaphragm (9), spider (7), and voice coil (8a) with respect to the voice coil bobbin (8) even in a high-temperature environment. The purpose is to ensure secure attachment.

[0007]

[Means for Solving the Problems] According to the first aspect of the present invention, a diaphragm, a spider, and a voice coil to be attached to the voice coil bobbin are attached to the voice coil bobbin at the so-called bonding points with the voice coil bobbin. A pair of upper and lower retaining protrusions are provided on the outer circumferential surface of the unit to sandwich the attached item, thereby preventing it from falling off and improving adhesive workability.

In the second aspect of the invention, a curling portion for preventing falling off that abuts against the coil portion of the voice coil is formed at the lower end of the voice coil bobbin on which the voice coil is wound.

[0009]

In the speaker unit according to the first aspect of the present invention, the voice coil, the diaphragm, and the spider are bonded and positioned between the retaining protrusions provided on the outer peripheral surface of the voice coil bobbin.

[0010] In the speaker unit according to the second aspect of the present invention, the voice coil is abutted and locked in the curling part for preventing falling off provided at the lower end of the voice coil bobbin.

[0011]

[Embodiment] Fig. 1 is an enlarged vertical cross-sectional view of the vicinity of a voice coil bobbin showing an embodiment of a speaker unit according to the first aspect of the present invention, (8) is a voice coil bobbin, (9)
(7) is a diaphragm, (7) is a spider, (8a) is a voice coil, and (13) is a bump on the outer circumferential surface of the voice coil bobbin (8) at the bonding point between each of these and the voice coil bobbin so as to sandwich each of them. The pair of upper and lower annular retaining protrusions (11) and (12) are used to hold the diaphragm (9), spider (7), and voice coil (8a) between them using these retaining protrusions. These are the adhesive and adhesive varnish that were adhered to the voice coil bobbin (8).

FIG. 2 is an enlarged vertical cross-sectional view of the voice coil bobbin portion showing an embodiment of the speaker unit according to the second aspect of the present invention. The voice coil (14) is a curling part formed at the lower end of the voice coil bobbin (8) to abut against the lower part of the voice coil (8a) to prevent it from falling off. It is characterized by the presence of curling parts.

In the first aspect of the present invention, the outer peripheral surface of the voice coil bobbin (8) has a pair of upper and lower holes between which the diaphragm (9), the spider (7), and the voice coil (8a) are each located. Since a stopper protrusion is provided and each protrusion is used to bond these together, the adhesion work is easy and there is no possibility of the product falling off even when used in a high temperature environment.

In the second aspect of the present invention, the lower end of the voice coil bobbin is formed with a curling part for preventing falling off, which abuts against the lower end of the voice coil (8a).
The voice coil will not fall off even when used in high temperature environments.

[0015]

As explained above, the voice coil bobbin according to the first aspect of the present invention is provided with a pair of upper and lower retaining protrusions that sandwich the diaphragm, the spider, and the voice coil and adhere them in place. This makes the bonding work easier and prevents each component from falling off, resulting in a speaker unit suitable for use in high-temperature environments such as high-temperature exhaust ducts.

Furthermore, in the second aspect of the invention, since the curling part for preventing falling off which abuts against the lower part of the voice coil is formed at the lower end of the voice coil bobbin, the voice coil bobbin can be processed more easily and can be used in high temperature environments. The voice coil can be reliably prevented from falling off when used.

[Brief explanation of drawings]

FIG. 1 is an enlarged vertical cross-sectional view of the periphery of a voice coil bobbin according to a first aspect of the present invention.

FIG. 2 is an enlarged vertical sectional view of a voice coil bobbin portion according to a second aspect of the present invention.

FIG. 3 is a vertical cross-sectional view of a conventional speaker unit.

FIG. 4 is an enlarged vertical cross-sectional view of the vicinity of a conventional voice coil bobbin.

[Explanation of symbols]

7 Spider 8 Voice coil bobbin 8a Voice coil 9 Diaphragm 13. Retention protrusion 14 Curling part to prevent falling off

Claims (2)

[Claims] Claim 1: A pair of upper and lower retaining protrusions are provided on the outer peripheral surface of a voice coil bobbin to which at least one of a diaphragm, a spider, and a voice coil is attached, sandwiching the diaphragm, the spider, and the voice coil so as to be located at the bonding point of the object to be attached. A speaker unit characterized by: 2. A speaker unit characterized in that a voice coil bobbin around which the voice coil is wound has a curling ring formed at the lower end of the voice coil bobbin to prevent the voice coil from falling off and abuts against the coil portion of the voice coil.