JPS6014596A - Speaker enclosure unit for voice communication terminal - Google Patents

Abstract

The invention provides an enclosure arrangement for a loudspeaker (10) adapted to be mounted in a voice communication terminal. The invention provides primary and secondary enclosures for the loudspeaker. The primary enclosure comprises a piece of resilient open cell foam material (15) having one face provided with a concavity suitable for receiving the spider (12) and the voice coil structure (11) of the loudspeaker (10). The peripheral edge of the one face of the foam material (15) is secured to the peripheral edge (14) of the spider (12) and the outer surface of the foam material has a flexible layer (16) of substantially air-impermeable material, whereby the loudspeaker is provided with an attached flexible enclosure (33). The secondary enclosure comprises the housing (30) in which the loudspeaker is mounted. The flexibility of the primary enclosure allows energy to be coupled between itself and the secondary enclosure.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention generally relates to an acoustic transducer (sound tγαn5).
-lαting device), and more specifically, a voice communication terminal (voice corwmbnication).
equipment for use in external terminals”
(nclosure arrangement 8).

A loudspeaker consists of a voice coil or motor unit that operates an acoustic conical diaphragm on one side of which acts on an enclosed space known as a loudspeaker enclosure. Since the enclosure gloss provides an acoustic load to the diaphragm, the operational characteristics of the loudspeaker are influenced by the acoustic characteristics of the enclosure gloss. For many years,
The best possible sound reproduction, especially the so-called hi-fi Chi
Significant efforts have been made to design enclosures for gh-j'ide lity) devices.

Over the past few years, it has become increasingly common to equip short-term communication devices, particularly telephone devices, with hands-free voice communication capabilities. Similarly,
Display phone (CD1playphone) (Trademark of Northern Telecom Co., Ltd.) with a combination of voice and data terminals (co?7+, bined voice)
e/dataadvanced teiAcorrvn
communication tprminals') also provides hands-free voice communication/use of speakers.

However, many problems are associated with this development. First, the loudspeaker is usually placed on the inside surface of the howsong.
Frequently clamped and mounted in a single position, the entire unit containing the various electronic circuits is therefore fitted with a haphazard enclosure for the loudspeaker Chap/Bazarcl.
enclosrtre'). Secondly, since devices of this type are intended to provide only voice communication as opposed to high-fidelity music, and manufacturers consider it desirable to minimize the cost and size of their devices. As such, the speakers used there tend to be inexpensive, small units with acceptable frequency response only in the audio frequency range.

The marginal quality (ma) of the sound produced by such a loudspeaker device
Contributing to the r g i l αl quα1ity) are the lack of proper enclosure gloss, the loudspeaker cone resonance C1o, which results in the unit producing excessive acoustic power near the lower end of the audio frequency spectrum;
udspgaker cans resonance)
It is in the effect of. Of course, a solution to this problem through the use of conventionally designed enclosures is entirely viable, but expensive and impractical.

In the past, attempts have been made to improve the output performance of a loudspeaker without mounting it in an unsuitable enclosure. For example, U.S. Patent No. 83λ085 describes a low frequency loudspeaker in which the tendency to give excessive mid-range sound output was overcome by equipping the loudspeaker with a circular disc of inozolene rubber mounted inside its conical diaphragm. are doing. The disk is tangentially attached to the diaphragm at its periphery in a circle spaced inwardly from the outer circumference of the diaphragm and at its center to the crimp dome for the loudspeaker.

Another method for improving overall speaker output response is disclosed in U.S. Pat.
No. 324.966, the U.S. patent describes a loudspeaker and a pulping (τalv
ing) Pseudo-enclosure Cpsgudo-gnc comprising a pair of sound absorption chambers interconnected by a device
los1Lrg).

Yet another method of providing an enclosure for a speaker is described in US Pat. No. 3,720,285. The purpose of this device was to replace absorbent phase materials such as glass fibers that are often used in enclosures. This patent provides an enclosure made of a rigid foam plastic material that is molded into the surround of the speaker.

When cured, the plastic skin seals the enclosure gloss and provides a hard self-contained enclosure gloss.

In addition to the practical equipment problems associated with such devices, the resulting enclosure increases the low resonant frequency of the speaker. That is exactly the opposite what the present invention has accomplished.

While effective for their intended purposes, these prior art techniques have introduced costly and complex solutions that are unsuitable for the problem at hand.

It is therefore an object of the present invention to provide an economical and simple solution to the problem of fully adapting the frequency response of small speakers for use in audio communication terminals.

According to the invention, a voice communication terminal (vOice comrav, -n
electro-acoustic transducers (electro-αc) for use in
Q-ustic tra? Lsducer l is provided. Small speaker (small 1 loudspeaker)
ker) has a voice coil structure and a conical diaphragm supported by a spider with a peripheral edge defining the shape of the speaker. A piece of resilient open cell foam material having a complementary shape similar to the shape of the loudspeaker described above has one side with a suitable recess (conCατity) for receiving the spider and voice coil assembly. the peripheral edge of the spider is attached to the edge of the foam material, and the outer surface of the foam material is covered with a flexible layer of substantially air-impermeable material, whereby the loudspeaker The package is attached to a flexible
e backcavtty enclosure '4
f equipped.

It is also an object of the invention to provide an improved enclosure arrangement for speakers used in audio communication terminals. This is an attached flexible enclosure (atta
This is accomplished by providing the manufacturer with a first enclosure consisting of a ched flexible enclosure and a second enclosure consisting of a scissor terminal and clamp. Smooth the frequency response in a flexible enclosure
It is effective in removing low frequency peaks due to the resonant frequency of the speaker and the resonant frequency of the speaker. This is accomplished without unduly affecting the speaker's normal low frequency response.

Therefore, the present invention substantially eliminates the response peak due to the speaker's resonant frequency, and improves the overall frequency response (o
verall frequency γ esponss
) has been improved to provide a complete economical enclosure device for telecommunications enclosure pieces. Since the enclosure is small and flexible, the unit can be fitted into a clamped position on a piece of equipment.

Historically, loudspeakers will operate acceptably even if portions of the flexible enclosure are deformed at an angle relative to adjacent components, or even if the enclosure is shaped to conform to the space in which it is mounted.

Embodiments of the invention will now be described in conjunction with the accompanying drawings.

FIG. 1 shows a miniature loudspeaker 10 including a voice coil structure 11 and a speaker 12 supporting a conical director diaphragm 13; It can be of any shape. A common nominal pitch diameter for these speakers is approximately 21/4 inches by 34 inches. Peripheral edge of suzoida 12
14 defines the perimeter and shape of the speaker 10.

Shown in cross-section is a piece of flexible foam material 15 having an open cell or air permeable structure. The foam material has a complementary shape similar to that of the speaker, i.e. it is circular or rectangular and approximately
with an aperture in the geometric center and a conical recess for close-fitting engagement with the voice coil structure 11 and the earpiece 12.
ent ) f allow. Thus, for a circular speaker, the foam material is somewhat donut-shaped. of course,
The foam is compressed to fit the contours of the speaker without unduly affecting the speaker's response, resulting in a conical depression.
It should be recognized that it is usually not necessary to provide a Foam materials suitable for implementing the present invention are commercially available from a variety of manufacturers. Flexibility (flezib) to provide maximum acoustic energy absorption with minimum weight and thickness to that basic requirement.
ity), open cell structure (open cell 5tr
sbcturers l and small pore size (por
e 5ize l.

The outer edge of the foam material is adhesively attached to the peripheral edge 14 of the speaker 10. Of course, it is entirely possible to mechanically attach the foam material to the peripheral edge 14, for example by using continuous clips along the edge 14.

In any case, the joint between foam material 15 and fluidizer 12 is preferably air impermeable (aiγ-impermeable).
ermea-bie).

The outer surface of the foam material 15 is covered by a flexible layer 16 of air impermeable material that seals the pores of the foam material 15. Various rubber paints and compounds and faces are ideally suited for this application. Of course, the sealing material and foam material must be chemically compatible. For example, silicone rubber has been found to be ideally suited as a sealing material.

The volume surrounded by flexible layer 16 provides a first enclosure for speaker 10. The efficiency of the enclosure can be increased by closing the circular opening in the center of the foam material 15. This can be achieved by adhesively attaching a circular piece of air impermeable material 17 over this opening. Of course, the piece 17 should be of sufficient size to seal the opening and can conveniently be made from ABS I acrylonitrile-butadiene-styrene) tink. Alternatively, the opening can be simply sealed with paper, cloth or glass adhesive tape. Continuous epidermis (5kin)
Or foam material 15 that provides sealing 1@
It should be recognized that a complete enclosure can be created by using thicker pieces of. However, the donut-shaped foam material is suitable for advantageous manufacturing methods and for obtaining a more compact unit.

FIG. 2 is a graphical representation of the improved performance of the transducer of the present invention. Waveform 20 shows a small unmodified Subi, IJ (sma
ll untn, odifiedtolLdspeak
represents the nominal frequency response for er ). It can be seen that the speaker produces excessive sound power between about 200 Hertz and 650 Hertz and various other smaller variations across the audio frequency spectrum. These fIJJJ are due in part to the speaker's resonant frequency and in part to internal housing reflections due to lack of a proper enclosure for the speaker.
g reflections). Waveform 21 shows the smoothing effect provided by the enclosure device of the present invention. Resonant frequency effects are canceled and the effects of housing reflections are substantially minimized without unduly affecting the speaker's low frequency response.

Waveform 22 shows the speaker response that can be expected if the first enclosure is made from a hard material. Undesirable 400 peaks are eliminated, but removes the speaker's low frequency response (mwtilating)
That sacrifice is being made.

Providing the first enclosure with a flexible outer layer ensures that an energy coupling exists between the first and second enclosures. Of course, the amount of coupling will vary according to the degree of flexibility of the sealing j-. It can be increased in summer by providing one or more breather holes, as shown at 18, in the sealing layer of the camp ring. Increasing the hole size or the flexibility of the sealing layer increases the low frequency response of the speech transducer. Of course, the required coupling N depends on the speaker characteristics and can be determined with minimal experimentation.

FIG. 3 shows an enclosure device according to the invention. A typical audio communication terminal is shown comprising a housing 30 containing various electronic components 31, C" RT 32, and an electrical sound transducer 33 having the structure as shown in FIG. 1. Attaching the transducer 33 The flexible enclosure provided provides a first enclosure that is energy coupled to a second enclosure formed by the interior volume of the housing 30.

It can therefore be seen that the present invention provides a speaker with improved frequency response characteristics. Self-contained enclosure (flt2Xib
le 5elf-c, continuedencro8r
bre), the transducer has a forced location of the communication terminal [(constrained location).
n) can be fitted. The flexible enclosure can be slightly deformed without causing the speaker response to be affected. Similarly, if space constraints require this, it is entirely possible to create the shape of the first enclosure, for example by cutting out small parts. , fc, for example, line, (-/f(
The volume enclosed in FIG. 1):r* and the outer surface 16 of the enclosure can be easily removed. Of course, the newly exposed surfaces of the foam material would have to be resealed, for example with silicone rubber.

[Brief explanation of drawings]

FIG. 1 is a partial sectional view of an electroacoustic transducer according to the present invention. FIG. 2 is a graphical representation of a typical frequency response for the transducer of FIG. 1. FIG. 3 is a partial cross-sectional view of an enclosure arrangement according to the present invention. ...Small speaker, 11
......Voice coil structure, 12...
...Snosoida, 13...Conical acoustic diaphragm, 15...Flexible foam material, 16...Air impermeable layer , 20...
・・・・・・Waves caused by unimproved speakers! Cedar, 21...
. . . Waveform of a speaker with an enclosure device according to the invention, 22 . . . Waveform of a Yanghe where the first enclosure is rigid, 30 . . .
・・・・・・・・・・Electronic parts,
32・・・・・・・・・CRT, 33・・・・・・・・・
・It is a transducer. Patent applicant: Northern Tencom Limited 5C

Claims (1)

[Claims] 1. A spider (12) having a peripheral edge (14) defining the shape of a voice coil structure (11) and a speaker (10);
A small speaker (10) having a conical diaphragm (13) supported by an N/C, and having a complementary shape similar to the shape of the speaker (10) and including an opening approximately at its geometric center. , the voice coil structure (11
) for attaching a peripheral edge of one side of said foam material (15) to a peripheral edge (14) of said slider; the foam material (15);
The outer surface of the flexible layer of substantially air-impermeable material [1
6), thereby giving ′i,
Air acoustic transducer. 2 further comprising a piece of air-impermeable side bevel (17) having dimensions larger at least at the edges than said opening, said material being affixed to said foam material to effectively seal said opening; An electroacoustic transducer according to claim 1. 3. Electrical acoustic transducer according to claim 2, wherein the material (17) is a thin disk of ABS plastic. 4. Electroacoustic transducer according to claim 2, wherein the outer flexible layer of the enclosure is provided with at least one energy coupling hole (18). 5. Electroacoustic transducer according to claim 1, wherein said one side of said foam material (15) also comprises a conical recess suitable for accommodating said spider. 6. Electroacoustic transducer according to claim 1, wherein the foam material (15) is adhesively attached to the peripheral edge. 7. a spider (12) having a peripheral edge (14) defining the shape of the voice coil structure (11) and the speaker (10);
) supported by a conical diaphragm (13)'ii
a small speaker (10) having a shape of the speaker (10) and a piece of resilient open cell 7 ohm material (15) having a complementary shape similar to the shape of the speaker (10);
) has a recess suitable for receiving the spider (12) and the voice coil structure (11), and further defines a peripheral edge of the one side of the foam material (15) with a peripheral edge ( 14), the outer surface of the foam material (15) being covered with a flexible layer (16) of substantially air-impermeable material; An electroacoustic transducer configured with an attached flexible enclosure gloss. 8. Outer flexibility of said enclosure (16) Id at least one energy coupling hole (18)
Claim 7: A self-contained electroacoustic transducer. 9. Electroacoustic transducer according to claim 7, wherein the foam material (5) is adhesively attached to the peripheral edge (14). 10. A speaker enclosure device adapted to be attached to an audio communication terminal housing (30), the first enclosure comprising a compact flexible enclosure (33) attached to the speaker; The first enclosure is formed with a second enclosure consisting of a housing (30) to which the first enclosure is attached, the flexibility of the first enclosure being that of itself and the second enclosure.
An enclosure device that allows interaction and use with an enclosure. 11. An enclosure device for a speaker (10) adapted to be attached to a housing (30) of an audio communication end, the speaker (10) having a voice coil structure (11) and a diaphragm (13). The enclosure gloss device includes a supporting spider (12) made of a resilient open cell foam having an opening at its approximate geometric center to permit interference fit engagement with the voice coil structure (11). a first enclosure comprising a piece of material (15), a peripheral edge of one side of the foam material being attached to a peripheral edge (14) of the spider (12) and an outer surface of the foam material; has a flexible layer (16) of substantially air-impermeable material, whereby the loudspeaker has an attached flexible enclosure gloss (33), the second enclosure covering the loudspeaker and The attached first enclosure (33) comprises a housing (30) to which the attached first enclosure (33) is attached, the flexibility of the 6!41 enclosure being such as to allow interaction between itself and the second enclosure. Enclosure gloss device. 12. An enclosure gloss device according to claim 11, wherein the opening of the xzM+ flexible first enclosure gloss is sealed with a piece of air impermeable material (17) adhesively attached to the foam material. 13 flexibility of the first enclosure) & (16) at least one energy coupling hole (18)
13. An enclosure glossing device according to claim 12, comprising: 14, tJ8 with 1 enclosure gloss foam material (15
12. Enclosure polishing device according to claim 11, characterized in that the screw punch is attached tangentially to the peripheral edge (14). 15. One side of the foam material is the i? 12. An enclosure glossing device as claimed in claim 11, further comprising a conical recess suitable for accommodating a lid. 16 Enclosure device for a loudspeaker (10) adapted to be mounted on a voice communication terminal housing song (30), the loudspeaker (10) supporting a voice coil structure (11) and a diaphragm (13). The enclosure device includes a spider (12) for receiving the loudspeaker (10);
a first enclosure comprising a piece of resilient open cell foam material (15) having two sides, the peripheral edge of the one side of the foam material being attached to the peripheral edge (14) of the spider (12); The outer surface of the foam material is provided with a flexible layer (16) of substantially air-impermeable material.
), thereby. The speaker has a flexible enclosure attached thereto, the second enclosure gloss has a housing (30) in which the speaker and the attached first enclosure are covered, and the first enclosure gloss The flexibility of the enclosure device is such that it allows interaction between the eye body and the enclosure. 17. The enclosure device of claim 16, wherein the outer flexible layer of the first enclosure is provided with at least one energy coupling hole (18). 18. Enclosure arrangement according to claim 16, wherein the foam material (15) of the first enclosure is adhesively attached to the peripheral edge (14) of the snow slider (12).