JP2544643Y2 - Speaker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a speaker used for a vehicle, a door mount, and the like.

[Conventional technology]

In-vehicle speakers, door-mount speakers, etc., are required to be thinner in order to increase the degree of freedom in mounting locations.

FIG. 2 is a sectional view showing an example of a conventional thin speaker. The speaker shown in FIG. 2 has a yoke 1 having a center pole, a ring-shaped magnet 2, a ring-shaped plate 3, a substantially conical frame 4 having a smaller diameter toward the lower side, and a voice coil. Cylindrical voice coil bobbin 5, damper 6, conical diaphragm 7,
Dustproof cloth 8, ring-shaped grill frame 9, and grill cover 10
And is constituted by.

The yoke 1, the magnet 2, and the plate 3 are fixed to the lower surface of the frame 4 made of an iron plate or the like by caulking or bonding to form a magnetic circuit. The lower part of the voice coil bobbin 5 is inserted and arranged in the magnetic gap of this magnetic circuit. The upper part of the voice coil bobbin 5 is held by the inner peripheral edges of a damper 6 and a diaphragm 7 bonded to the frame 4, respectively, and the upper opening is closed by a dustproof cloth 8 to prevent dust on the magnetic circuit portion. ing.

Further, the outer peripheral edge of the diaphragm 7 is bonded and fixed to the outer peripheral portion of the frame 4. A ring-shaped grille frame 9 is fitted and fixed to the outer peripheral edge of the frame 4, and a grille cover 10 is further fixed to the grille frame 9 to protect the diaphragm 7 from dust and protect it.

[Problems to be solved by the invention]

However, in the speaker according to the conventional technique, for example, when trying to reduce the thickness of a speaker having a diameter of 13 cm, the overall height including the grill cover 10 is about 45 mm, and the overall height not including the grill cover 10 is about 32 mm. This is a limit, and there is a problem that sufficient reduction in thickness cannot be achieved, and when the magnet 2 and the plate 3 are made thin, the amplitude of the vibration system such as the voice coil bobbin 5 and the damper 6 is inevitably suppressed. As a result, there remains a problem that the low-frequency reproduction capability and the input resistance are reduced.

The frame 4 extends downward, and a magnetic circuit including the yoke 1, the magnet 2, and the plate 3 is provided so as to protrude from the lower surface of the frame 4. However, there is a problem that it cannot be installed in a place where there is no space for receiving the magnetic circuit portion.

Further, the voice coil bobbin 5 has a diaphragm 7
It is only held at the center by the inner peripheral edge of the sensor, which causes abnormal vibration such as rolling at high input, which may cause abnormal sound such as voice coil touch or disconnection of the voice coil. there were.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and aims to further reduce the thickness of a speaker, enhance low-frequency reproduction capability and input resistance, improve the degree of freedom in mounting locations, and further improve the voice coil bobbin. It is an object of the present invention to provide a speaker having a structure that can surely maintain the center of the speaker.

[Means for solving the problem]

In order to achieve the above object, the present invention provides a substantially flat frame, a dish-shaped lower plate placed on the upper surface of the frame, and an opening having a central portion having an outer peripheral portion outside the lower plate. A substantially plate-shaped damper fixed to a peripheral portion, an inverted plate-shaped upper plate having an opening at a central portion and having an outer peripheral portion fixed on an outer peripheral edge of a lower plate via a damper; A magnet that is fixed to the lower plate through the respective openings of the plate and the damper, and a cylindrical voice that is wound around the voice coil and inserted into the outer periphery of the magnet and whose lower end is held by the inner periphery of the damper A speaker comprising a coil bobbin and an inverted dish-shaped diaphragm whose inner peripheral edge is fixed to the upper end side of the voice coil bobbin and whose outer peripheral edge is supported by the outer peripheral portion of the frame. That.

[Action]

According to the above means, the frame is formed in a substantially flat plate shape, the lower plate is placed on the frame, and the magnet and the upper plate are arranged on the lower plate. There can be no plane. Therefore, it is not necessary to provide a space for accommodating the magnetic circuit in the mounting place as in the related art, and the mounting can be easily performed by selecting a place for vehicle mounting, door mounting, and the like.

Further, the frame is formed in a substantially flat plate shape, a magnetic circuit is arranged on the frame, an inner peripheral edge of the diaphragm is held at an upper end side of the voice coil bobbin inserted into the magnetic circuit, and an outer peripheral edge of the diaphragm is held. Is supported on the outer periphery of the frame, so that the upper end side of the voice coil bobbin can be the top of the diaphragm, that is, the top of the speaker, so that the overall height of the speaker can be reduced and the speaker can be made thinner.

Further, the outer peripheral portion of the substantially flat plate-shaped damper is fixed on the outer peripheral edge of the dish-shaped lower plate, and the outer peripheral edge of the inverted dish-shaped upper plate is fixed via the damper. Without using any other means, it is possible to secure sufficient space above and below the inner periphery of the damper,
Since the diaphragm was formed in the shape of an inverted dish like the upper plate,
A sufficient gap can be secured without the upper plate and the diaphragm partially approaching each other. Therefore, the amplitude of the voice coil bobbin and the diaphragm fixed to the inner peripheral portion of the damper can be set to be large, and the low-frequency reproduction and input resistance can be improved while being thin.

In addition, the lower end of the voice coil bobbin is held by the inner peripheral portion of the damper, and the upper end side is held by the inner peripheral edge of the diaphragm. Abnormal vibration such as rolling at the time can be prevented.

〔Example〕

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a longitudinal sectional view of a speaker according to an embodiment of the present invention.

Reference numeral 11 denotes a substantially flat frame made of resin or die-cast aluminum. In the center of the frame 11, a hole having an inclined surface 11A inclined so as to have a smaller diameter from the upper surface side to the lower surface side is provided. The lower surface of a lower plate 12 formed in a substantially dish shape from a magnetic material such as iron abuts on the inclined surface 11A, and the lower plate 12 is placed and fixed in a state of being positioned at the center of the upper surface of the frame 11. .

A substantially flat damper 15 is provided on the outer peripheral edge of the lower plate 12.
The outer periphery of the damper is fixed by adhesive.
The outer peripheral edge of the upper plate 14, which is formed in a downward substantially dish-like shape, is adhesively fixed with the outer peripheral portion 15 held therebetween.
The central portions of the upper plate 14 and the damper 15 are open, and the magnet 13 is bonded and fixed to the center of the upper surface of the lower plate 12 through each of the openings. A magnetic circuit is formed by the lower plate 12, the magnet 13, and the upper plate 14, and a magnetic gap is formed between the outer periphery of the magnet 13 and the opening of the upper plate 14.

The voice coil bobbin 16 is inserted and arranged in the magnetic circuit so as to partially cover the outer periphery of the magnet 13. A voice coil is wound around the voice coil bobbin 16 at a position facing the magnetic gap. Further, the lower outer periphery of the voice coil bobbin 16 is inserted into the inner peripheral portion of the opening of the damper 15 and is held at the center, and the upper portion of the voice coil bobbin 16 is formed in a downwardly substantially plate-shaped diaphragm.
It is held by 17 inner peripheral edges. The upper opening of the voice coil bobbin 16 is closed by a dustproof cloth 18 having an arc-shaped cross section.

The outer peripheral edge of the diaphragm 17 is supported by the outer peripheral portion of the frame 11, so that the diaphragm 17 is mounted in a substantially dome shape with the inner peripheral edge as the top. Further, a grill cover 19 formed in a downward dish shape so as to cover the vibration plate 17 is fixed to the outer peripheral portion of the frame 11.

The overall height H of the speaker thus constructed according to the present invention.
Represents the vibration amount (stroke) of the vibration system such as diaphragm 17 by Xm
ax (considering four strokes such as the gap between the grill cover 19 and the inner peripheral edge of the diaphragm 17 as shown in FIG. 1), the plate thickness of the upper plate 14 as tg, and the plate thickness of the lower plate 12 as tb. Then, it is determined by the following equation.

H = 4.Xmax + tg + tb Therefore, even when a speaker having a diameter of 13 cm is obtained, the total height H including the grill cover 19 can be suppressed to about 30 mm, and the thickness can be reduced by about 35% compared to the conventional structure. Approximately 25 overall height without grill cover 19
mm, making it about 25% thinner than conventional structures.

Further, in the above structure, since the lower surface of the frame 11 can be a flat surface without unevenness, it can be easily installed anywhere for mounting on a vehicle or for mounting on a door without limiting the mounting place.

Furthermore, since the upper end of the voice coil bobbin 16 is held by the inner peripheral edge of the diaphragm 17 and the lower end of the voice coil bobbin 16 is held by the inner peripheral edge of the damper 15, horizontal vibration such as rolling or abnormal vibration occurs even at high input. Never do.

Also, a damper is provided on the outer peripheral edge of the dish-shaped lower plate 12.
The outer peripheral portion of the upper plate 14 is fixed through the outer peripheral portion of the damper 15 and the outer peripheral edge of the inverted plate-shaped upper plate 14 is fixed. Therefore, sufficient vertical space near the inner peripheral portion of the damper 15 and a gap between the upper plate 14 and the diaphragm 17 can be sufficiently secured. Therefore, the amplitude of the voice coil bobbin 16 fixed to the inner peripheral portion of the damper 15 and the amplitude of the diaphragm 17 can be increased, and the low-frequency reproduction capability and the input resistance can be improved.

[Effect of the invention]

As described above, according to the speaker of the present invention, the frame is formed in a substantially flat plate shape, the lower plate is placed on the frame, and the magnet and the upper plate are arranged on the lower plate. The lower surface of the frame can be made completely flat without protruding from the lower surface of the frame. Therefore, the degree of freedom of a mounting place is greatly improved, for example, a space for accommodating the magnetic circuit is not required, and the mounting can be easily performed regardless of the place, such as for a vehicle or a door mount.

Further, the frame is formed in a substantially flat plate shape, a magnetic circuit is arranged on the frame, an inner peripheral edge of the diaphragm is held at an upper end side of the voice coil bobbin inserted into the magnetic circuit, and an outer peripheral edge of the diaphragm is held. Is supported on the outer periphery of the frame, so that the upper end side of the voice coil bobbin can be the top of the diaphragm, that is, the top of the speaker, so that the overall height of the speaker can be reduced and the speaker can be made thinner.

Further, the outer peripheral portion of the substantially plate-shaped damper is fixed on the outer peripheral edge of the dish-shaped lower plate, and the outer peripheral edge of the inverted dish-shaped upper plate is fixed via the damper. A large space is formed between the plates, and a sufficient vertical space near the inner peripheral portion of the damper can be secured without using a spacer or the like. Further, since the diaphragm is formed in the shape of an inverted dish like the upper plate, a sufficient gap can be secured without the upper plate and the diaphragm partially approaching each other. Therefore, the amplitude of the voice coil bobbin fixed to the inner peripheral portion of the damper and the amplitude of the diaphragm can be set to be large, respectively, and the low-frequency reproduction capability and the input resistance can be improved while being thin.

In addition, the lower end of the voice coil bobbin is held by the inner peripheral portion of the damper, and the upper end side is held by the inner peripheral edge of the diaphragm. Abnormal vibration such as rolling at the time can be prevented.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a speaker according to an embodiment of the present invention,
FIG. 2 is a longitudinal sectional view showing an example of a conventional speaker. 11 ... frame, 12 ... lower plate, 13 ... magnet, 14 ... upper plate, 15 ... damper, 16 ... voice coil bobbin, 17 ... diaphragm.

Claims (1)

(57) [Scope of request for utility model registration] 1. A substantially flat frame, a dish-shaped lower plate mounted on an upper surface of the frame, and an opening in a central portion having an outer peripheral portion fixed to an outer peripheral edge of the lower plate. A substantially plate-shaped damper, an inverted plate-shaped upper plate having an opening in the center and having an outer peripheral edge fixed on the outer peripheral edge of the lower plate via the damper, and the upper plate and the damper A magnet that is fixed to the lower plate through each of the openings and a voice coil wound around the voice coil, inserted into the outer periphery of the magnet, and has a lower end held by the inner peripheral portion of the damper. A coil bobbin, and an inverted dish-shaped diaphragm whose inner peripheral edge is fixed to the upper end side of the voice coil bobbin and whose outer peripheral edge is supported by the outer peripheral portion of the frame. Speaker that.