DE1437462A1 - Speaker device - Google Patents

Description

new complete

PATENT LAWYERS DR. F. ZUMSTEIN - DR. E. ASSMANN DR. R. KOENIQSBERQER - DIPL.-PHYS. R. HOLZBAUER TELEPHONE S ₂₃₄₇₀ and

TELEQFtAMMEtZUMPAT.

POST CHECK ACCOUNT: MUNICH 9113O

. BANK ACCOUNT!
BANK H. HOUSES

6 / Li
(2/2/1)

ρ 14 57 4-62.0

β MDNOHEN 2, BRÄUHAUSSTRA88E 4 / III

CORPOMt ¹ IOF, lofcyo / Japan

Speaker device

The invention relates to a loudspeaker device with a Loudspeaker, an end wall to which this loudspeaker "is attached." is, this end wall has an opening through which the sound wave from this loudspeaker is radiated directly is, with a rear wall, with several supports that extend between, the front wall and the rear wall, and with several side walls, which are formed from a thin membrane, γόη each of which forms a sub-map hragma-ITeld, the Front wall, rear wall and the side walls form a housing of the loudspeaker device.

The invention seeks out relatively small speaker enclosures an amplified, composite sound wave in the low frequency range to accomplish.

_K1 ,,, 809803/0334

Neue Unterlaneri / Art 7 a ι

Use the relatively small loudspeaker housings known so far gewölinlicti cone speaker, where it is known that the characteristics of a cone loudspeaker in the song frequency range considerably, is weakened. This weakening ! is based on the fact that two sound waves are composed at the diaphragm, whose phases are diametrically opposed, whereby the cumulative "effect leads to a mutual extinction, thereby creating an empty space in the pretuence spectrum will"

Attempts have been made to resolve this feather frequency error to compensate, but these attempts inevitably led to the use of relatively large housings. The radius of a Sound screen used for this purpose is e.g. by

C '

the equation R ^ = —— where c is the sound

'4 f _c .
speed and "^ O & i- ^{e are} low-frequency limit.

- C

if .f is in the vicinity of 1OG Hertz, then the required Sound screen with a diameter of 1.8 m; own. The housing Small transistor radios only have a fraction of the sound this dimension, and a sound screen for this or an equivalent device would have to have an effective radius of about 15 cm. However, such a device has a limit frequency of about 600 Hertz and therefore very poor fidelity.

The invention seeks to avoid these disadvantages and almost create uniform frequency response without

BATH 80 98 03/03 3 4

I 1 W / J W.

increase the dimensions of the sound system zn.

This is achieved according to the invention in that the end wall and the outer wall are made so rigid that excitation by the vibrations of the air vibrators. of the speaker is prevented, and that each side wall is so thin that it easily corresponds to the vibration of the internal air pressure in the Housing can be energized, creating a reinforced composite Sound wave in the low frequency range is obtained.

Exemplary embodiments of the invention are provided below explained with reference to the drawing in which

Pig 1 is a schematic view of a sonic walker according to FIG shows an embodiment of the invention, also being a vector diagram a work phase is planned,

Pig. 2 is a perspective view of a loudspeaker room show with the main speaker according to the invention.

IPig. 3 is a perspective view of the Pig sounder. 2, but with the main speaker shown built into the tree,

JPig, 4 is another perspective view of the loudspeaker shown in FIG. 3, but in the front view, Tig. Figure 5A is a section along line AA in Pig. 4 and

ITig. FIG. 5B is an enlarged partial section of a portion of FIG Pig. 5A,

Pig. 6 is a front view of the same sounder; Pig. 7 is a reproduction diagram of the frequency characteristic

809803/0334

1 1 SJ I IV .fm.

of an upper miä * of a ^ lateral oub-diapliragina, the

in the sounder according to the Pig .. 4 to 6 related . will; ■ '': _ · ■ "

8 is a diagram in which the frequency characteristic of the ' ^ =

'""". Sounder under different ambient conditions un- \

gen is drawn on; '. .-._ .. l

Pig .. 9 is the electrical analogue of that in aen P'ig »1 ils 6- l

shown mechanical sounder; .and the· . %

Pig. 10, 11 and 12 show various schematiseh Äusführungs- ■ i

shape according to the invention. . ■ - ' £

In the pig. 1 to 6 is a sounder with a loudspeaker.

. Room or housing 1 shown, which consists of a front wall 2, |

a rear wall 3 and 4 side walls 4, 5, and ''. The κ

Front wall 2, a laittelöffung 8, in which an Iautspre- j-

rather 9 with a conus diaphragm 10 and an electroacoustic "~ ;. _t

TJmforJiier (transducer) 11 is built in. To see below the $

characteristic features and advantages of the invention to'er- \ .; |

. Yes*

sound, the sound generator shown in Pig «1 can be so · ■ - |

should be sought as if its casing had the dimensions of, p

"13 x 13 x 8 cm, while the diameter of the loud-; |"

speaker diaphragm should be 10 cm ". The internal volume of the % Grehäuses t is about 1170 a .. · '-; t

In the illustrated preferred embodiment of the Srfin. ; f

dung, the front and rear inserts 2 and 3 X

made of relatively stiff vinyl chloride plates with a thickness of et- ^ l

wa 4 mm formed. The side walls 4, 5, β and 7 are as subjects ji?

Diaphragms formed ^ by being made of a plastic material, - _: [

.809 8 03/0 334 bad original ^

e.g. vinyl chloride _t polyethylene sheathing, polypropylene or 5-pack. -The same, in the form of a thin sheet or membrane of etv / a ■ 1 inra thickness and low QV / ert are shaped. The term Q means the sharpness of resonance. Y / u We also apply a coating 12 of a synthetic Iiautskliukkleie on the back of each of these sub-diaphragms as a dampening gown. Such a coating can be about 2 mm thick. The front and rear insert pieces 2 and 3 are structurally attached to one another by brackets or cross bars 13. Under certain circumstances it has been found that considerably better results were obtained when E. on an elastic member 14 "made of a material such as" .3. Polyurethane foam, molded v / uräQ, zidfiechort 3c3oe äer ßub-Diaphraßpicii 4 _r 5, G unö 7 and -the neighboring ICLaiaEaer 13. The elastic rope 14 is relatively small in cross sectional area and is in the sub-diaphragm, against which there is arranged centrally ^ t

• Ϊ arranged.- ■ ^! |

As shown particularly in FIG. 5, there is a slight tightness. · I fiberglass 15 over the inner surface of the rear wall 3 of the housing 1 - \ ; · .. provided so that a standing wave is in a -over 1000 ^! ;

Hertz can train the lying area. . -;

From aufzuzeigenden below reasons the IMPORTANT- ^is: ness shows that the housing 1 nit the loud-dazugehörGiiclen - "" · • Speakers 9 is substantially complete airtight.

809803/0334

Since: the Hrf inciting can be better assessed j seilte Ksii see certain characteristics of the elnec lion tic-laiit speaker and the cc associated G-ehciusec keep in mind. The usual housing space has a normal, front is llosus loudspeaker radiant sound wave, closely connected with a sound wave with a sound component. In Pax-httoig on the IIaux> tachse dea g ^ onus, the oils normal sound wave tries to extinguish or essentially aazusclraächen. The sound wave with \ ... ' :. · The phase is caused by the unzipped passage on the sound tube or housing or "is based on a secondary sound wave, oil by .vibration" -the front or rear insert of the open, 2auas is emitted · Until aehsllausbreibung nit OiU;, r ' o: ^ u. ^ u2 phase is of course unorv / ünscht in a sound geoer. 3s has been found that a sound wave nlt a Se keitskoriponente · -. Icichtung in a right angle to the main axis of the Iconus-Speaker e'chers a "/ Irksairies Kittel · Terstärkung to the characteristic of the encoder is the preferred Ausführuiigs- £ orm of the invention is shown in AEEN Pig. 1 to 6 j is obtained. by iJekundärstrahlen resulting from the side slot satsstÜc _l k-Siib-I! laphragEien 4 ₅ 5, 6 and 7, the latter being excited by the internal pressure of the housing. VS> ri-iiTs-Since the sub-diaphragms have a predetermined large mechanical resistance, there is practically no phase difference between the secondary radiation and the internal pressure. These, sub-diaphragms 4, "5 _r 6 ^ηΏ & 7 are counted so that they

BAD ORIGINAL '809803/0334.

1 I \ JI I \ SS—

in resonance with the frequency range of interest

with a word Q which covers a broad area with a reinforced characteristic, as in 2'ig. 7, provides. The arrangement leads to the fact that in the higher frequency range an increased additional set cell is obtained, which gives an increased sound fidelity to the overall Greber characteristic.

'Pig' 7 shows the frequency behavior characteristics for two of the four sub-diaphrogae, oie in d ^ eliv Sehallgeber after the ^ ig. 1 to 6 occur, and particularly looks at those which belong to the S ub-Piaphragma-SiTi sat ζ pieces 4 and 5, examined nan a sound generator with the with reference to the Pig. 1 to G dimensions and characteristics described so found one that the sub-diaphragms have an Ilesonanzspitse at about 500 Hertz and the V / ert Q set between 2 and 3 roots. In Pig. 7, in which the abscissa is the frequency in Hertz and the ordinate represents the acceleration characteristic -in dB, the solid curve 16 is the retention characteristic for the sub-diaphragm 4, and the dashed line shows the relationship characteristic for the öub diaphragm 5. Hs it is noticeable that in both cases the characteristic of the prevence values below and above the resonance is large.

Furthermore, that the area of the highest character- ·. stik is one where the normal characteristic of small professed chaiigebers has only insignificant or no characteristic at all. This can be exploited to

809803/0334

anä- .. ". · ^ esarutschallgG bei a characteristic to give, which is uniform up to a point about under 200 Hertz, how you look at a contemplation of; Fig ..-. 8 results. "·. '',,

• Pig-. S, is plotted on the abscissa! Frequency in Hertz and the ordinate represents the Sehalldruckeharakteristik in dB at the, shows the ^G esantcharakteristik the sounder

"of Pig. 1 to 6 under variable environmental conditions.

In one of the pails, the shell donor was set up in a room in which there was practically no reflection. The solid curve 18 according to Pig. 8 shows the behavior under this Bedinguiig. Another environmental condition for the .Schallgeber was that in which the sounder housing 1 with the Eüclovand directly against the wall of a 'Häucies with normal sound reflection conditions set up T? Ar. The ^y Gesantcharakteristik one's such ß-ebers is represented by the offset line 19 in Hg. 8, by third Pail was the one in which the housing of the Sehallgebers aufgeste in the corner of an ordinary Hauiaes 11t "\ 7ar, and the overall characteristics of such an arrangement is represented by the dash-dotted line in Pig. 8

■ -um-gebun.es/. . . -. -. - A fourth u / .. "" ibedingung.v7 was created in that the housing 1 was placed against a wall of an ordinary tree, but close to a sack, so that a sub-diaphragma had a part from the wall, but close to the V / and that of the first wall of the Ba urnee. neighboring was- · "The overall chaos"

characteristic of the sounder under this condition is through the dotted line 21 in Pig. 8 shown. In all palls

.80 980 3/0 334

'BATH-

there was a considerable improvement in the characteristic in the standard frequency range achieved. Kit an egg cone speaker ' and a housing of the same size, but without 'Gub diaphragms, the limit frequency is around 600 Herts. Inventor effective or cut-off point is considerably reduced, without the size of the enclosed skinless being increased. .

Bine further "improvement occurs through '''the Verwendung.der IteflektionsCharakteristiken des'Hauses is disposed in the donor, a This can be a Haun one compartment to be one-Plugseug or automobile or the _like.?. -

# ig.- 8 shows that the low-frequency behavior of a sound generator according to the invention can be further exploited by utilizing the reflection of the environment. The arrangement shown by the dotted line 21 shows an improvement of approximately 10 dB in the low frequency range for a non-re ± ^v reading tree. From this fact it can easily be found that an effective means of increasing the behavior of the overall system can be found through the narrow space conditions which typically occur in automobiles, ships and plug eyes. ·

The sound generator according to the invention becomes better by looking at it 'its electric, in Pig. 9 understood analogs shown. The .acoustic impedance of the housing Z is called Suianie- ■

809803/033 ^

V Γ ·; ■ '

rung ßer altUö '"tiscijen ^; ICfipsEity of the housing! parallel * nit.fior.., SubHDxaTjlirarmn-jkpeciaiis dar ^ osts * -diO-sus-liasce ϊΐ

niseiier capacity or pediatric leaning forward · G and one? ^ see C ± üerstund E exists.2Γ iat in grater tilt -der, Ilauptöia—

II, C _Q and Γ: -gescbcXtet »The entrance röes _; . _; , _5; -

Circuit v; xrß öui-ch a voltage source the nit the to the main diaphragm through deii Do uiiiorner put ICraf't compare]? is*

^ 'aeii aer-' I theory of the e le lit rise, with SchQ-ltungen eats- the inipedans of a PörallelkkreisB .inner less than- the I;,. pedciiz one of those in question will- una ^ bcJ-n ^ ig von äen .... V / er ta K ₁ , C mid? _v , S inaer · cureb the Anv? ec-enbeit

> S ί ^ G

of the diaphragms are reduced. Lies .jedoeb

/ ~ Ii _o -Fj (V .Ii _n '* ■ -) _ / under ^ ---, - or is the same

this vert, so ν ground the sub-diaphragms an effective by-pass for C nit dem. Result that Z ^ is significantly reduced. There

C "is a building-dependent; it is a factor, is the parallel connection effect des Sub-Diax / bragHae very suitable, na diminution; iia C-obii.UDevolume without corresponding inducements from Z

to call out. If the characteristics of the sound emitter "nit. Den There is a current in the circuit, so a small digit leads one better ones. Characteristic for the PreriUensbereieh, in the

the sub-dia / phragaa passes through its slightest irapedence. . this

■ __. ■. "aa aia j-i-aGunansstalle ~.

is the i-requena range whose! litte ,. YA & ll7V ^ f% Z ~ ^^ rzQ '-: - ~ ^ Z * ~%

about at; 5üO Hert z V'i © in Ji-Z-ί ϋ.ο ^
relent is) the -

_βAD 8098Q3 / 0334;

Tests have shown that the volume reduction effect of the sub-diaphragm parallel path is between 50 and. 70 ^c / o lies. In particular, that in Pig. 1 housing shown with a Yoluiaen from about 1170 he is a common housing kit in terms of sound fidelity. Volume over 2000 cn equivalent characteristic.

The Fig. 10, '11 and 12 show abgeminderte Ausführungsf orinen of the present invention, in mg. · 10 are laterally inserted sub-diaphragms by Hall-cones'' (drone comes) 22, 23, 24 _s and replaced 25th The main speaker 10, however, remains the same. Forehand 2 and back wall (not shown in Fig. 10) remain relatively stiff. The side walls 26, in which the cones 22 to 25 are installed, are also relatively stiff. The conicities 22 to 25 have a r; -.-:;.,; Iron resonan ?! . "... the mechanical oscillation, which is around 500"; *. - ■ · -.

In the embodiment forms shown in Figures 11 and 12, the front and rear walls are made of relatively stiff material and are spaced apart in parallel. The connecting wall between the front and rear inserts forms a sub-diapliragrna 27, which - in cross section in the Pig. 11 embodiment shown is circular, and wherein in I ⁿ ig * 12 GEAE temperate A us guide has sForm elliptical cross section. These inserts connecting the S ü diaphragms

809803/0334

1 437 46 Z-

are designed so that the resonance parts of the mechanical

Vibration is around 500 Herta.

In Pig. The embodiment shown in Figure 12 are two electrical "operated main speakers 28 and 29 are provided.

each of the in'den Pig. 10 Ms 12th embodiment shown According to the invention, the closed bar is essentially airtight. Closed. * '- ■.

The materials mentioned in the embodiments which serve merely to "explain the invention" are only mentioned as examples, without limiting the invention, it being desirable that only the front and rear insert pieces of the visual generator are relatively stiff, and that the ., in such a way * formed. Sub-Siaphragrden., .and dimensioned built-are that a. '' .- .. '''mechanical ^.. natural frequency yields _t oils something · under the normal ßrenafrequenz the' main speaker alone It is also important that the sub-diaphragms are arranged so that they oscillate at substantially correct angles to the axis of vibration of the main loudspeaker or speakers.

Changes and modifications are within the scope of the invention.

BAD'ÖRIÖINAJL.

80.9803 / 0334

Claims (1)

P a t e η t a n s ρ 'r ii c h e 37462. · Loudspeaker device with a loudspeaker, an end wall, "to which this loudspeaker is attached, this end wall having an opening through which the sound waves from this loudspeaker are directly afoeostrahlfc" ralfc © incx "nintorv / and, with several supports, between the. Front wall and the rear wall Ersti ^v corners, and a plurality of Seitenwänöon, the thin membrane from a * are formed, each of which. A sub-diaphragm field forms »with the front wall, rear wall and side walls forming a housing of the loudspeaker device, characterized in that the front wall and the rear wall are so rigid that - excitation by the vibrations of the loudspeaker air swirls is prevented , and that each side wall is so thin that it can be easily excited in accordance with the vibration of the internal air pressure in the gel jelly, thereby obtaining an amplified composite sound wave in the low frequency range. Speaker provision according to Claim 1, characterized by im substantial stiff yor & er and rear walls. 3jspeaker device according to claim. 1, characterized in that around the mechanical resonance point of the side walls "forming Frequency range lying sub-slide, one frequency in the lower Part of the speaker's frequency spectrum. Loudspeaker device with a loud speaker housing, a
Main speaker with an electro-acoustic converter
(transducer) and a main diaphragm built into this loudspeaker housing, characterized in that at least
a sub-diaphragm is built into this housing and with
its axis of vibration is arranged perpendicular to the axis of the main diaphragm, in that the resulting pressure from the main loudspeaker causes the Süb diaphragm to be excited. Loudspeaker device with at least one main loudspeaker:
with an electroacoustic converter and a .Hauptdiaphrag- 1 ma, characterized in that the loudspeaker housing has relatively ΐ thick and essentially stiff front and rear walls, whereby the attenuation in the low frequency range Γ is largely reduced, and that this housing is made of ξ sub- Has side walls formed by diaphragms with supports Ϊ interposed between the front and rear panels, |; whereby unnecessary vibrations avoided that elastic ropes f between the sub-diaphragms and the supports are arranged \ ", and that finally a, .glasfiberähnliche layer on [ the inner surface of the rear wall is provided. i- ν Loudspeaker device with a main loudspeaker with a {■ / electroacoustic transducer and a main diaphragm, thereby | characterized in that a loudspeaker housing has relatively thick and Γ essentially stiff front and rear walls and P side walls designed as sub-diaphragms, the main ι 809803/0334 loudspeakers and the adjoining ¥ ¥ ¥ ¥ ¥ ums so hewn together are that a space is formed essentially in the absence of air. 7. loudspeaker device according to claim 6, characterized in that that the sub-diaphragms are made from relatively thin vinyl chloride sheets manufactured with great mechanical resilience (compliance) which eliminates any phase difference between the radiation from the main speaker and the secondary radiation from the Sub-diaphragm is avoided. 8. loudspeaker device according to claim 1, characterized in that that the sub-diaphragms are in an electrical analogue position as a parallel path to the volume depending on the acoustic capacity of the housing are shown, whereby a drop in volume is possible without a corresponding increase in acoustic impedance is caused. 9. loudspeaker device according to claim 1, characterized in that that the sub-diaphragms are conical or conical. 10. loudspeaker device according to claim 1, characterized in that that the loudspeaker housing is cylindrical and has at least one main loudspeaker unit. 8098Ü3 / Q334