EP0078649A1 - Isolierende Unterlage - Google Patents

Isolierende Unterlage Download PDF

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Publication number
EP0078649A1
EP0078649A1 EP82305655A EP82305655A EP0078649A1 EP 0078649 A1 EP0078649 A1 EP 0078649A1 EP 82305655 A EP82305655 A EP 82305655A EP 82305655 A EP82305655 A EP 82305655A EP 0078649 A1 EP0078649 A1 EP 0078649A1
Authority
EP
European Patent Office
Prior art keywords
mat
support
spring elements
isolation pad
pad according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP82305655A
Other languages
English (en)
French (fr)
Inventor
James Stewart Aldridge
Robert William Head
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Avon Industrial Polymers Melksham Ltd
Avon Industrial Polymers Ltd
Original Assignee
Avon Industrial Polymers Melksham Ltd
Avon Industrial Polymers Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Avon Industrial Polymers Melksham Ltd, Avon Industrial Polymers Ltd filed Critical Avon Industrial Polymers Melksham Ltd
Publication of EP0078649A1 publication Critical patent/EP0078649A1/de
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/002—Devices for damping, suppressing, obstructing or conducting sound in acoustic devices

Definitions

  • This invention relates to pads for absorbing vibration.
  • pads are of course in general very well known, for example, pads being put under typewriters to absorb the vibration that they generate, and pads or springs being interposed between vibrating machines and their mountings.
  • the present pad has a highly specific application namely to be interposed between a loud-speaker and its support, and is intended for the "hi-fi" or audiophile market.
  • Loud-speakers are frequently rested on shelves or other pieces of furniture. Characteristically these are much less robust than the cabinet or other structure housing the loud-speaker.
  • the loud-speaker When the loud-speaker generates sounds, two kinds of vibration may be transmitted to the shelf or other support.
  • the present invention is a pad for interposition between a loud-speaker and its support so as to diminish or remove the vibration occurring in the shelf or other support. It diminishes the effect of any acoustic coupling between the two and also diminishes or removes the mechanical transmission of vibration between them.
  • the pad acts as an acoustic mass loading in relation to the shelf or other support.which characteristically will be comapratively readily energised by soundwaves in the air (or by mechanically transmitted vibrations).
  • the mat should preferably provide a mass loading of between 1 and 2 kgs to the support system to attenuate airborne vibrations in'the support. If this is done the under-surface of the mat should be essentially flat and smooth and the mat made of a material which will conform to the surface on which it rests without movement. For aesthetic reasons the mat should not be too thick, hence a high density elastomeric material is desirable for the main body of the mat.
  • the mat as a whole should be compliant.
  • the spring rate of the spring elements should be such that the resonant frequency of the speaker, mounted on to the mat, should be below 20Hz.
  • a single mat or a single set of spring elements has to cater for a range of speakers whose masses may differ by a factor of 5:1. If the spring elements had linear characteristics, then the deflections would be excessive with the heavier speakers and could lead to some instability and large amplitude movements at resonance.
  • the amplitude at resonances is controlled by the "Q" factor.
  • One means of reducing the Q factor would be to use a high damping rubber but this would lead to a greater transmissibility of the higher frequencies.
  • the alternative means of lowering the Q factor is to have a non-linear spring rate. The most desirable condition is to have the spring rate proportional to the static load applied by the speaker which will give constant resonant frequency.
  • a most economical way of achieving this within the present invention is to form the spring elements in the mat as a series of domes.
  • the action of the domes can be simply understood by considering the fact that when a light load is placed on the dome, the greater part of the dome is free to deform under shear but, when a heavy load is applied, the whole of the central area will be immobilised against the load and only a narrow annulus is now free to deform.
  • Loud-speakers are usually of box construction and resonances within the loud-speakers are at their greatest in the centre of the box sections. Conversely these resonances will be at a minimum at the corners of the box.
  • there are preferably four spring elements in the mat which are situated to support the corners of the loud-speaker.
  • the spring elements isolate mechanical vibrations from the support at frequencies above the natural resonant frequency produced by the loud- speaker with the enclosure supported by the spring elements. It is advantageous that this resonant frequency occurs between 10 and 20 Hz to prevent coupling of vibration within the range detectable by the ear and prevent the enclosure from being unstable when mounted on the mat.
  • the use of domed pads as spring elements has the useful property of providing a more or less constant resonant frequency for a wide range of weights of loud-speakers. Large amplitudes of vibration can be induced if sound is reproduced by the loud-speaker at the appropriate frequency when the enclosure is mounted on linear spring elements.
  • the material of the spring elements may be the identical material of the rest of the appropriate surface of the pad, i.e. the pad may be formed in an integral forming operation or it may be an inserted plug of a different material, inserted into a formed aperture in the pad.
  • Elastic mouldings for the spring elements may be separately moulded in a different material to the main body of the pad. In this way the elastic and damping properties of the spring element may be optimised to minimise the mechanical transmissions from a given loud-speaker to a given shelf or other support.
  • Such inserts may be coded in some way, as for example by colour, to the intended use.
  • the thickness of material in a dome will be not more than one third and preferably not more than one quarter of the thickness of the remainder of the pad, and the degree of projection above the upper surface of the pad to the upper surface of the projection will be of the order of 11 ⁇ 2 times the thickness of the pad.
  • the pad (excepting the spring element) will preferably be made of a single material but may be made of a plurality of materials laminated or bonded together; it is desirable for it to have a pile or flock coating, particularly on the surface adjacent to the loud-speaker.
  • Figure 1 shows an acoustic isolating pad 1 embodying the inventionfor interposition between the loud-speaker and its supporting.surface such as a shelf. It is a rectangular one-piece moulding of the high-mass, compliant elastomer material. The moulding has a plurality of specific spring elements 2 towards each of the corners and these are upwardly domed portions in the upper surface of the pad under which are formed voids or hollows. These are for primarily supporting the loud-speaker on the pad. Apart from these the lower surface of the pad is completely flat as is also the upper surface except for marginal bevelled area 3.
  • Figure 2 shows a section through the pad and shows two alternative ways of forming the spring elements.
  • the left hand side of Figure 2 shows an integral discontinuity as described with reference to Figure 1, the projection 2 being formed of a thin portion of the same elastomer material bridging over in a part-dome the void 5 underneath it.
  • the provision of such inserts 8 has the advantage that either in the factory or in the hands of the user inserts 8 of different characteristics may be placed in the mat in order to accommodate most efficiently the weight, size or other characteristics of different loud-speakers.
  • the spring elements whether they be integral or due to the inserts 8 have the function of primarily absorbing mechanical vibration generated in the loud-speaker while the rest of the mat lying dead and flat upon the shelf or other support for the loud-speaker acts as a massive acoustic load for that support and deadens the vibration of the support due to any acoustic coupling through the air.
  • Figure 3 is a graph showing the response of a given shelf and loud-speaker at a range of frequencies, i.e. the acceleration of the shelf immediately below the:speaker resulting fr-om a constant mechanical shock, in Figure 3a showing the position without the inserted pad and in Figure 3b showing the response of the shelf when the pad was inserted, the latter demonstrating a dramatic decrease in the stray and unpredictable resonances which would otherwise have impaired the true response characteristics for which the loud-speakers were designed.
  • Figure 4 is a graph of the deflection of an integral spring element which was a dome of 6 mm thick elastomer integral with the pad, curved at a radius of 53 mm and with a diameter of the aperture of 45 mm.
  • the elastomer was natural rubber.
  • Figure 5 shows the self-resonant frequency of a system incorporating that pad and a number of loud-speakers of different weights. It will be seen that a substantially constant self-resonant frequency of below 15Hz can be obtained over a range of speaker weights from about 2 Kg to about 14 Kg.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Vibration Prevention Devices (AREA)
  • Vibration Dampers (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)
EP82305655A 1981-10-27 1982-10-25 Isolierende Unterlage Withdrawn EP0078649A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8132377 1981-10-27
GB8132377 1981-10-27

Publications (1)

Publication Number Publication Date
EP0078649A1 true EP0078649A1 (de) 1983-05-11

Family

ID=10525425

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82305655A Withdrawn EP0078649A1 (de) 1981-10-27 1982-10-25 Isolierende Unterlage

Country Status (2)

Country Link
EP (1) EP0078649A1 (de)
JP (1) JPS5884242A (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1791388A1 (de) * 2004-09-15 2007-05-30 Kazuo Uejima Mat für akustikvorrichtung
USD757846S1 (en) * 2013-10-28 2016-05-31 Roland Corporation Antivibration pedestal for a musical instrument

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60120053A (ja) * 1983-12-01 1985-06-27 Photo Composing Mach Mfg Co Ltd 植字装置における光学部材設定方式

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2541159A (en) * 1946-01-22 1951-02-13 Paul H Geiger Sound deadener for vibratory bodies
US3647022A (en) * 1968-11-30 1972-03-07 Gruenzweig & Hartmann Sound absorber construction
DE2433795A1 (de) * 1974-07-13 1976-01-15 Messerschmitt Boelkow Blohm Zwei- oder mehrschalige hohlwand zur abschirmung von stoerschallquellen
GB1422255A (en) * 1973-04-05 1976-01-21 Kuraisura Denki Kk Howling insulator
US4251045A (en) * 1979-02-12 1981-02-17 Meyerle George M Method and apparatus for reducing undesired transmission of acoustic energy from a loudspeaker cabinet and for acoustically isolating high fidelity sets therefrom
EP0025632A1 (de) * 1979-09-18 1981-03-25 Philippe Delhez Verfahren zur Verwirklichung akustischer Schranken

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2541159A (en) * 1946-01-22 1951-02-13 Paul H Geiger Sound deadener for vibratory bodies
US3647022A (en) * 1968-11-30 1972-03-07 Gruenzweig & Hartmann Sound absorber construction
GB1422255A (en) * 1973-04-05 1976-01-21 Kuraisura Denki Kk Howling insulator
DE2433795A1 (de) * 1974-07-13 1976-01-15 Messerschmitt Boelkow Blohm Zwei- oder mehrschalige hohlwand zur abschirmung von stoerschallquellen
US4251045A (en) * 1979-02-12 1981-02-17 Meyerle George M Method and apparatus for reducing undesired transmission of acoustic energy from a loudspeaker cabinet and for acoustically isolating high fidelity sets therefrom
EP0025632A1 (de) * 1979-09-18 1981-03-25 Philippe Delhez Verfahren zur Verwirklichung akustischer Schranken

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1791388A1 (de) * 2004-09-15 2007-05-30 Kazuo Uejima Mat für akustikvorrichtung
EP1791388A4 (de) * 2004-09-15 2009-11-18 Kazuo Uejima Mat für akustikvorrichtung
US7770693B2 (en) 2004-09-15 2010-08-10 Kazuo Uejima Mat for acoustic apparatus
USD757846S1 (en) * 2013-10-28 2016-05-31 Roland Corporation Antivibration pedestal for a musical instrument

Also Published As

Publication number Publication date
JPS5884242A (ja) 1983-05-20

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): BE DE FR GB NL

RBV Designated contracting states (corrected)

Designated state(s): BE DE FR GB NL

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19840410

RIN1 Information on inventor provided before grant (corrected)

Inventor name: HEAD, ROBERT WILLIAM

Inventor name: ALDRIDGE, JAMES STEWART