JPS60219899A - Speaker - Google Patents

Abstract

PURPOSE:To obtain a flat speaker with light weight and high performance by joining a surface material with a single face of a thin plate having plural protrusions disposed in a radial shape and bonding a voice coil bobbin on the other face where no surface material is jointed. CONSTITUTION:A polyarylate resin film in thickness of 100mum is formed by vacuum molding, and an then a core material 10 of height of 1.0mm. and a diameter of 28mm. having a protrusion part 10a and a recessed part 10b is formed. A surface material 11 made of aluminum foil (20mum thickness) is stuck to a single face of the core material 10 by a polyester adhesive 12, thereby constituting a diaphragm. An upper part of a voice coil bobbin 14 is bonded on the other face where the surface material 11 is not stuck by an epoxy resin 13, while on a lower part of the voice coil bobbin 14, a voice coil bobbin 15 is arranged. Thus the weight of the speaker is lighter than conventional one, and furthermore a sound pressure level with high sound pressure frequency characteristic can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION l) Field of Industrial Publication The present invention relates to a speaker in which a diaphragm is formed by bonding 16 surface materials on one side of a structure having a large number of hollow irregularities.

Conventional structure and its problems Ideally, the diaphragm of a speaker should move as a piston over the frequency band used, but what if the diaphragm deforms or split vibration occurs during vibration? ) New Year's wave number characteristics, distortion rate, phase characteristics, etc. will deteriorate, which will impede the production of city fidelity {I}. In order to solve these problems, in the recent 4I, instead of the conventional paper cone diaphragm, a 1F diaphragm using a rigid aluminum honeycomb sandwich structure has been adopted. However, aluminum honeycomb has the disadvantage that the production cost is extremely high because the manufacturing method is a double bell.

For this reason, instead of aluminum honeycomb, we use the product R-film and the composite polymer Finolem. - A method has been considered in which C = flat cane core with irregularities due to molding A: A (hereinafter referred to as core material). However, since all of these use a sandwich structure as a diaphragm, as shown in Fig.

Table I By driving the first resonance, the fh of the canceling speaker is set to 79 at a distance of 1 from the second resonance frequency of the diaphragm.In Figure 2, 4 is 11-plate diaphragm integrated with the sandwich structure shown in FIG. 1, 5 is a coupling cone whose opening tip is fixed to the flat plate diaphragm 4, and 6 is a voice coil bobbin whose tip is fixed to the coupling cone 4. , 7 is a voice coil inserted into a magnetic gap (not shown) of a magnetic circuit, and 8 is a voice coil whose inner circumferential end is glued to the outer circumferential edge of the flat diaphragm 4, and whose outer circumferential edge is attached to a frame (not shown). ), etc., is a damper that supports the voice coil bobbin 6 in a fixed position.

The driving force from the voice coil configured in this way is
Since the first resonance frequency of the plate diaphragm 4 is transmitted to the nodal circle via the coupling cone 6, there is a disadvantage that the vibration string f'+' is heavier than a paper cone speaker. Conventional flat plate speakers have a problem in that when using the same magnetic circuit, the sound pressure is lower than that of paper cone speakers.

OBJECTS OF THE INVENTION The present invention solves the above-mentioned conventional problems, and aims to provide a lightweight and high-performance flat plate speaker.

Structure of the Invention The speaker of the present invention has a structure in which a surface material is bonded to one side of a flat thin plate having a large number of radially arranged protrusions, and a whistling coil hobbin or a coupling cone is bonded to the side where the surface material is not bonded. The diaphragm has a diaphragm having such a structure that it can be made lighter by requiring only one side of the surface material, compared to the 12-piece sandwich structure conventionally used as a flat diaphragm. Also, in terms of the rigidity of the diaphragm, the uneven part on the side where the surface material is not bonded is used as a voice coil bobbin.

Because it is a structure that is fixedly connected with a coupling cone or adhesive, it can achieve the same effect as a structure in which pressure surface materials on both sides are joined. A speaker with a diaphragm capable of achieving LIJ function.

Description of examples Examples of unfired IJI will be described below.

3.1 (a) and (b) are the first Tenshis of the present invention]
Figure 3 (&) is a concentric moon pattern diagram, and Figure 3 (b) is A of Figure 3 (LL).
-A' line sectional view. In Figure 3, 10 is the thickness 1
A polyarylate resin film with a diameter of 28 mm and a height of 1 mm was formed by vacuum forming a 00 μm polyarylate resin film with the pattern shown in Figure 3.
．． 0..li. is the heartwood, 10& is the convex ridge of the heartwood 10, 1
0b is a recess. FIG. 4 is a perspective view of the core material.

Referring to Figure 6, 11 is a polynisdel adhesive 1 applied to one side of August 10 (the side in contact with the fourth part 10b in Figure 3).
Aluminum foil pasted by 2 (thickness 2oμm)
The diaphragm is composed of a surface material made of the following materials, and a structure made of the following materials. Reference numeral 13 denotes an epoxy resin for bonding the upper i::j portion of the voice coil bobbin 14 to the area where the surface material 11 is pasted (in contact with the striped portion 102L on the smaller side), and 15 is provided at the lower end of the voice coil bobbin 14. With the voice coil
It is incorporated into the magnetic circuit of the tweeter speaker that reproduces high frequencies. 16 is engineering and ji.

Figure 6 shows a speaker configured as shown in the diagram. It is an I-pressure New Year number feature map. The sound pressure frequency characteristics of a speaker using a conventional sandwich-shaped 41j flat plate diaphragm configured with the same number of months as the present example are shown.

The speaker of this embodiment has a diaphragm with a weight of 123 mf, which is 4ik lighter than the conventional diaphragm with a weight of 172,771 mf, so that a high sound pressure level can be obtained in terms of sound pressure frequency characteristics.

Next, a second embodiment of the present invention will be described.

The difference between this embodiment and the first embodiment is as follows.
A mica/epoxy composite sheet made by impregnating approximately 2017 t% of epoxy resin into laminated mican-1- (thickness: 601 tm) made from flaky mica with a size of 8 to 400 mm was heated and press-molded to form the pattern shown in Figure 3. It has a diameter of 28 mm; '+' g. 1, and uses ONM core material, and the other configuration is Mf as in the first embodiment.
Surface material 11. on one side of the marking material. The end of the voice coil bobbin 14 is in contact with the other surface.

FIG. 7 is a sound pressure frequency characteristic diagram in the second embodiment. For comparison, the I of a speaker using a conventional Santoy, Chi configuration, and a 11τ plate swing Ji# board configured with the same number of months as this example is shown.
SS station frequency characteristics are shown. The speaker of this embodiment has the following characteristics: 1. Ill handling city i+j is 120771r and it is light compared to the conventional example diaphragm 'fi, ::C170mV,! Therefore, a high voltage level of 1;';l can be obtained based on the Takatsuki frequency characteristic +zV-.

Next, a third embodiment will be explained with reference to FIG. 7.

In FIG. 7, 17 is a piece of material formed by mica/ebogishi composite sorting, with a surface material 18 on one side of the core material 17.
Paste C aluminum foil (20 μm) (;jt. 19 is pasted surface material 18 (, I do not put -L end)
], voice coil bobbin 19
1. A voice coil 20 is provided at the lower end. I'm here. 2
1 is an embossed contact Jh coated on the outer periphery of the voice coil bobbin 19 with a width Q of 52Qj and a U-circular band Vζ;
From the above, the convex portions 17& of the U material 17 are connected and fixed to constitute the vibration system of the speaker.

FIG. 8 is a sound pressure frequency characteristic diagram of the vibration system of the speaker of this embodiment, which can have a high sound pressure level as in the second embodiment.

Next, regarding the fourth implementation side 1, the ninth section 1. This will be explained using FIG. In Fig. 9 and Fig. 1o, 22 is a laminated mica made of scaly mica with a size of 8 to 400 horns/yu/mica/-1- (Iν diameter 60/7 m) impregnated with about 20 wt% epoxy resin.・A 28-diameter sheath having the pattern shown in FIG. 9 by hot press molding an epoxy composite sheet, height 1, o my no s1t, plate-shaped core material, 23 Iri core 4A' 22 t7) h l/u (In Fig. 9, a surface material made of aluminum foil (thickness 20 μm) was pasted on the concave g22b (the surface in contact with Ill) with a polyamide adhesive 24. Cover the top edge with epoxy resin 2
The voice coil bobbin 527, which is glued by 6, is installed at the lower end of the voice coil bobbin 25, and the voice coil is incorporated into the speaker's magnetic (C circuit).281
, edges 29 are the epoxy adhesive J8 filled in the recesses 22b, which is cured to connect and fix the protrusions 22& to form a diaphragm.

As mentioned above, the high voltage frequency inferiority of the speaker (j4)
L is shown in FIG. For comparison, we also show the wave number characteristics of the speaker using the conventional Santo-Tuna structure diaphragm, which is the same as the fourth implementation 1].The speaker of this example The diaphragm set i1t is 145my, and the conventional example's 1-axis sliding plate weight is 11 (light compared to the 170711'), so it has a high pressure frequency characteristic - [;
It has the advantage of being able to obtain a pressure level of 1, and also has a structure 5 that connects the protruding stripes by filling the four parts of the core with adhesive, so it is visually equivalent to a sandwich structure. , Is the rigidity of the diaphragm low? :, JL-1 Dragon frequency b
(7h) also provides a value equivalent to that of the conventional example.

In the third embodiment, the adhesive 21 is applied in a concentric band shape, but the same effect can be obtained by applying the adhesive 21 not only to one concentric band but also to a concentric solid band. . 1. In the fourth embodiment, the four parts 22b are filled with epoxy adhesive 29 in order to connect the protruding stripes 22&, but it is not always necessary to fill the four parts 22b. , the protruding strips 22a may be connected by filling a portion of the four portions 22b. Furthermore, the convex part 2
The shape of 2a may also be a shape other than that shown in this embodiment, such as an IY internal circular cross shape or an F square shape, and the same effect can be obtained as long as they are arranged radially. -Also, the size is not limited to a tweeter with a diameter of 2,811 mm, and it can also be used as a speaker with a large-diameter squawker or diaphragm of Uha River.

Effects of the Invention As detailed below, the present invention provides a large number of radiators 1.
A surface material is bonded to a thin plate piece σ11 having a convex shape arranged in a shape, and without bonding the surface material, a voice 21 bobbin or the end 4 of a coupling cone: the bonded structure is used as a vibration source for a speaker. It is used as a board.

Therefore, compared to the sandwich structure used in conventional flat diaphragms, only one side of the surface material is needed, and the light I
It is now possible to convert the sound pressure frequency to 4. ￥Mg l-de I
: High sound pressure can be obtained. In terms of the rigidity of the Ushida diaphragm, the voice coil bohin is placed on the surface where A is not attached.
force, soling cone or Vl, 1) Since the protrusions are connected and fixed by adhesive, it becomes a sand inch structure and a structure with an apparent upper surface, which has sufficient side illumination as a diaphragm.
It has a unique effect on people.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of a conventional sandwich structure flat plate diaphragm.
Figure 2 is a cross-sectional view of the vibration system of a conventional 1/plate speaker.
FIG. 3 (2L) shows the first embodiment of the present invention. Second. Heart IA pattern diagram in the third embodiment, FIG. 3(b) is similar to FIG. 3(a)
4 is a perspective view of concentric paulownia, and FIG. 5 is a sectional view taken along line AA' of 1. A sectional view of the vibration system of the speaker in the second embodiment, FIGS. 6, 8, and 11 are sound pressure frequency characteristic diagrams of the speaker in each embodiment, and FIG. 7 is a diagram of the speaker in the third embodiment. FIG. 9 (IL) is a perspective view of the vibration system of the fourth embodiment, and FIG.
Figure ('b) is a cross-sectional view taken along the line B--B' in Figure 9 (IL), and Figure 10 is a cross-sectional view of the vibration system of the speaker according to the fourth embodiment. 10...8 stripes, 10&...convex portion, 11...surface A, 12...polyendel system jg I;'l'
agent, 13... epoxy resin, 14... voice coil bobbin 1.15... whistle coil. Name of agent: Patent attorney Toshio Nakao et al.
1 Figure 2 Figure 3 Figure 6 Figure cd81 7N 19 i8 π Figure 8 (d or '591''22 22b 22α Figure 10 Figure 11 ■ Moderate number

Claims (3)

[Claims] (1) Release W from the middle U toward the outer periphery. arranged in an I-shape
The structure consists of a thin plate with many convex stripes and a surface material attached to one side, and a voice coil bobbin or cuff that transmits the driving force from the voice coil to the diaphragm. A speaker having a structure in which the end of the ring cone is in contact with the surface of the structure to which the surface material is not bonded. (2) The speaker according to claim 1, characterized in that an adhesive is applied to the surface to which the surface material is not bonded concentrically with the voice coil or the canode ring cone for at least one circumference to connect the convex portions. (3) The speaker according to claim 1, wherein the convex portions are connected by filling some or all of the four portions of the surface to which the surface material is not bonded with an adhesive.