JP2002528019A - Loudspeaker - Google Patents

Abstract

(57) Abstract: A rigid, lightweight resonance panel-shaped member, a housing to which the panel-shaped member is attached, and an elastic suspension connected between an edge of the panel-shaped member and the housing, the structure comprising a housing Medium / high frequency loudspeaker, wherein the panel and the panel-shaped member form an enclosed enclosure, and further comprising an electrodynamic vibration exciter for applying bending wave energy to the panel-shaped member to cause resonance and generate an acoustic output. An exciter unit, the exciter comprising: a magnet assembly secured to the housing and having an annular gap; and a voice coil disposed within the annular gap and secured near a geometric center of the panel-shaped member; Position of voice coil in annular gap is provided by elastic suspension Udosupika is an exciting unit.

Description

DETAILED DESCRIPTION OF THE INVENTION

TECHNICAL FIELD The present invention relates to loudspeakers, and more particularly, for example, from International Patent Application WO97
No. 09842 relates to so-called distributed mode loudspeakers of the kind described.

2. Description of the Related Art Hitherto, it has been very difficult to make a loudspeaker that covers the audible range of middle and high frequencies with high quality. In this region, since the directivity greatly changes, it is very difficult to extend the audible region to a high frequency only with a mid-range exciter. Generally, two exciters are used, with the expense and complexity of the divider circuit for dividing the frequency range. Generally, the division frequency is about 3 kHz, which is most sensitive to human hearing.
z, which contributes to the difficulty.

The technical idea of the present invention is to provide a medium and high frequency exciter which replaces the two exciters conventionally used, which exciters do not intersect in problem areas, Furthermore, it has a suitable wide directivity that is firm over the operating range. Distributed mode loudspeakers may not always be the best solution, for example in hi-fi applications, but can be designed to operate over an audio frequency band of approximately 8 octaves. Distributed mode loudspeakers may be suitable for use with subwoofers that intersect at low frequencies, for example, about 100 to 200 Hz.

Thus, it is not necessary to operate over eight octaves, but preferably six
There is a need for a loudspeaker or at least a loudspeaker excitation unit that operates in the audible band from 5 to 7 octaves, which allows for a wide choice of materials and various construction possibilities, fully optimized over the operating range Can help you. An example of this is a hi-fi midrange / tweeter excitation unit that works under the principle of distributed mode loudspeakers. This means that the division point can be up to 1 kHz, typically 300-500H, excluding the problematic 3kHz region.
The design down to z and the advantages of the excellent radiation characteristics of distributed mode loudspeakers can provide significant advantages over conventional box loudspeaker systems.

In addition, the market for high performance small speakers in multimedia and computer peripherals is expanding, and the demand for high quality compact loudspeakers for conventional TVs, monitors and flat panel TVs is increasing. It is constantly getting higher. Accordingly, there is a need for a structure that is very compact, high performance, versatile, and capable of adding many features for cost reduction.

The present invention provides an economical vehicle for all such applications,
Manufacturers can optimize mold costs and production processes. The basic concept is directed to a simple structure of a loudspeaker "engine" or exciter unit that is easy and consistent to produce.

SUMMARY OF THE INVENTION According to the present invention, a rigid lightweight resonance panel-shaped member, a housing to which the panel-shaped member is attached, and an elastic suspension connected between an edge of the panel-shaped member and the housing. In this configuration, the housing and the panel-shaped member form a closed enclosure, and furthermore, a bending force is applied to the panel-shaped member to cause resonance, and an electrodynamic vibration exciter that generates an acoustic output. There is provided a medium / high frequency loudspeaker excitation unit comprising: a magnet assembly fixedly secured to a housing and having an annular gap; and a magnet assembly disposed within the annular gap and secured near a geometric center of the panel-shaped member. A fixed voice coil, and the position of the voice coil in the annular gap is elastically supported. It has been brought about by the Pensions.

[0008] The flexural rigidity of the panel-shaped member may be in the range of 0.15 Nm to 24 Nm, and is preferably in the range of 2 Nm to 9 Nm. The vibration exciter may be bonded to the panel-shaped member (hereinafter "panel") and / or the enclosure using injection molding or adhesive. The voice coil of the vibration exciter may be directly coupled to the resonance panel during injection molding of the panel. Alternatively, the voice coil of the exciter may be coupled to a pre-formed opening that is formed into the resonant panel during assembly. That is, no separate voice coil support is required.

The panel may be formed integrally with the suspension. The suspension may be an elastic material such as plastic. The panels may be injection molded as a single piece or utilizing foam technology. The panels may be flat or curved, and may vary in thickness and cross section.

[0010] The enclosure may have embedded conductive inserts to efficiently transmit electrical signals from the connector at the edge of the enclosure to the vibration exciter. That is,
The interconnectivity between the assembly and the excitation unit can be automated. The excitation unit may be covered with another molding or structure to suit the application, for example for aesthetic reasons. For example, a suitable trim is suitable for mounting on a hi-fi speaker cabinet surface. Conversely, a suitable external molding can turn the engine into a multimedia speaker. Further, the engine can be mounted on another structure, such as a television cabinet. The present invention is illustrated by the example of the accompanying drawings.

FIG. 1 shows a loudspeaker excitation unit 1 intended for a medium / high frequency exciter, which can be used as a component of a loudspeaker system with a low frequency exciter. In this case, for example in multimedia, computer or automotive applications, the mid / high frequency and low frequency exciters may be mounted in a common cabinet or as a single exciter in a small loudspeaker.

The excitation unit 1 comprises a substantially rectangular enclosure 2 having a dish-shaped body 11 surrounded by an outwardly extending fixing flange 3 having holes 12 formed at intervals. This allows the enclosure to be secured in place, for example, in a loudspeaker cabinet (not shown) by a suitable fastener (not shown). Inside the enclosure 2, there is formed a diagonal flange 13 which can be made of, for example, plastic by injection molding and gives rigidity while keeping the enclosure lightweight.

The enclosure 2 has a substantially circular shallow recess 4 having a central through hole formed inside a base 14, and the recess is securely attached by a bolt 20 to a magnet assembly 7 of an electrodynamic vibration exciter 5. The circular receiving plate 6 is received exactly. The exciter 5 includes a magnet assembly having an annular gap 19, a voice coil, and a cylindrical winding assembly 8 disposed in the annular gap and movable in an axial direction in response to an electric signal applied to the voice coil. .

The receiving plate 6 is fixed to the enclosure in a suitable manner. That is, they can be fixed by fasteners or adhesive means, or can be formed integrally with the enclosure.

Adjacent to the edge flange 3, a substantially rectangular, rigid and lightweight resonance panel member 9 is
It is resiliently mounted on the enclosure 2 by a flexible foam suspension 10 surrounding the periphery of the panel 9. That is, the enclosure and the panel form the closed cavity 15. The suspension 10 can be fixed to the panel 9 and the enclosure 2 by an adhesive. Panel 9 is a distribution mode panel according to the teachings of WO 97/09842. The voice coil / winding assembly 8 of the exciter 5 is
As taught in U.S. Pat. No. 7,09,842, it is rigidly secured to the panel 9 at a suitable excitation location approximately in the center, and applies bending wave energy to the panel to cause resonance and produce acoustic output. The voice coil and coil former assembly 8 has an annular mounting member or leg 21, e.g., of plastic, for securing the edge adjacent the panel 9 to the panel, the fixation being made of an adhesive. You may go with the help. The exciter 5 is grounded to the enclosure 2 and has no suspension between the magnet assembly and the voice coil, and the centering of the voice coil in the annular gap of the magnet assembly is performed only by the suspension 10 at the panel edge. Note that In this way, the movable mass of the exciter is reduced and the high frequency response is improved. The output characteristics may be improved by thermally coupling the magnet assembly to the voice coil, and heat can be radiated from the exposed back surface of the receiving plate 6.

A small mass 17, for example in the range of about 2 grams to 12 grams, is locally selected and coupled to the panel to optimally tune the coupled resonance for proper overall response. . This approach has the unique advantage of extending the low frequency range of the assembly. An opening 18 coaxial with the voice coil through the panel 9 enhances high frequency response. Some sound absorbing material (not shown) in the cavity 15 is useful in reducing higher order standing wave amplitudes in the cavity and can further enhance frequency response.

The specifications of the aforementioned excitation unit are as follows. Panel dimensions = 210 × 148.5 mm (standard A5 size) Core = 3 mm polycarbonate honeycomb, cell diameter 3.5 mm Skin = 100 μm glass reinforced with 50% by weight polycarbonate skin (0 ° / 90 ° skin orientation) glass Fiber Flexural rigidity = 5.6 Nm Area density μ = 0.7 kg / m 2 Zm = 16 Ns / m Voice coil diameter = 26 mm The coil is placed at the standard distribution mode position (4/9, 3/7 = ratio). Large ferrite ring magnets improve BL and power handling. As described above, there is no suspension between the magnet and the voice coil, and the panel is held in place by the foam suspension around the edges. The panel may be positioned accurately within the voice coil using the holes in the panel to assist in positioning the voice coil in the annular gap. Locating pins may be provided on the enclosure near the panel edge to prevent lateral movement of the panel. FIG. 3 shows the frequency response of this panel.

The small version exciter unit can extend the response to the ultrasonic range,
High quality piezoelectric exciters are envisioned, which can be useful for new audio formats with acoustic bands of Hz and 100 kHz, and their performance goes beyond conventional piston technology.

Industrial Applicability The present invention thus provides a new mid- and high-frequency loudspeaker excitation unit, which solves the significant problems of known arrangements regarding frequency division and spreading.

[Brief description of the drawings]

FIG. 1 is a perspective view of a loudspeaker excitation unit with a part cut away so that internal details can be seen.

FIG. 2 is a cross-sectional view of the loudspeaker excitation unit shown in FIG.

FIG. 3 is a graph showing the frequency response of the excitation unit of FIGS. 1 and 2;

[Procedural Amendment] Submission of translation of Article 34 Amendment of the Patent Cooperation Treaty

[Submission date] November 13, 2000 (2001.11.13)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

──────────────────────────────────────────────────続 き Continuation of front page (81) Designated country EP (AT, BE, CH, CY, DE, DK, ES, FI, FR, GB, GR, IE, IT, LU, MC, NL, PT, SE ), OA (BF, BJ, CF, CG, CI, CM, GA, GN, GW, ML, MR, NE, SN, TD, TG), AP (GH, GM, KE, LS, MW, SD, SL, SZ, TZ, UG, ZW), EA (AM, AZ, BY, KG, KZ, MD, RU, TJ, TM), AE, AL, AM, AT, AU, AZ, BA, BB, BG, BR, BY, CA, CH, CN, CR, CU, CZ, DE, DK, DM, EE, ES, FI, GB, GD, GE, GH, GM, HR, HU, ID , IL, IN, IS, JP, KE, KG, KP, KR, KZ, LC, LK, LR, LS, LT, LU, LV, MD, MG, MK, MN, MW, MX, NO, NZ, PL, PT, RO, RU, SD, SE, SG, SI, SK, SL, TJ, TM, TR, TT, UA, UG, US, UZ, VN, YU, ZA, ZW

Claims (9)

[Claims] The structure includes a rigid lightweight resonance panel-shaped member, a housing to which the panel-shaped member is mounted, and an elastic suspension connected between an edge of the panel-shaped member and the housing. Is characterized in that the housing and the panel-shaped member form a closed enclosure, and further comprising an electrodynamic vibration exciter for applying bending wave energy to the panel-shaped member to cause resonance and generate an acoustic output. A high frequency loudspeaker excitation unit, wherein the exciter is secured to the housing and has an annular gap, and a magnet assembly disposed within the annular gap and near a geometric center of the panel-shaped member. A voice coil to be fixed, and a position of the voice coil in the annular gap. Loudspeaker excitation unit, wherein the mounting is provided by the elastic suspension. 2. The loudspeaker excitation unit according to claim 1, wherein the enclosure has a dish-shaped body surrounded by a fixing flange. 3. The dish-shaped body is provided with a through-hole, and the magnet assembly of the vibration exciter is fixedly attached to the dish-shaped body, whereby a part of its surface is formed in the through-hole of the body. The loudspeaker excitation unit according to claim 2, wherein the loudspeaker is closed. 4. The dish-shaped body is provided with a recess, the magnet assembly includes a receiving plate attached to the recess of the dish-shaped body, and the through-hole is formed in the recess. The loudspeaker excitation unit according to claim 3, wherein: 5. The loudspeaker excitation unit according to claim 1, wherein the elastic suspension is made of a foam material. 6. The panel-shaped member is sandwiched between skin layers,
A loudspeaker excitation unit according to any preceding claim, comprising a honeycomb material core having a flexural rigidity in the range of 0.15 to 24 Nm. 7. The loudspeaker excitation unit according to claim 6, wherein the flexural rigidity is in a range of 2 to 9 Nm. 8. The loudspeaker excitation unit according to claim 1, further comprising an opening that penetrates the panel-shaped member, is coaxial with the voice coil, and has a diameter smaller than the diameter of the voice coil. . 9. A loudspeaker excitation according to claim 1, comprising at least one mass mounted on the panel-shaped member and arranged to attenuate low frequency response. unit.