US3894612A - Speaker enclosure having improved wall plates - Google Patents

Speaker enclosure having improved wall plates Download PDF

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Publication number
US3894612A
US3894612A US417197A US41719773A US3894612A US 3894612 A US3894612 A US 3894612A US 417197 A US417197 A US 417197A US 41719773 A US41719773 A US 41719773A US 3894612 A US3894612 A US 3894612A
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United States
Prior art keywords
plate
speaker enclosure
billets
speaker
wall plate
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.)
Expired - Lifetime
Application number
US417197A
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English (en)
Inventor
Yoichi Maeda
Hideharu Nagahara
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TRIO ELECTRONICS Inc
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TRIO ELECTRONICS Inc
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Filing date
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Application filed by TRIO ELECTRONICS Inc filed Critical TRIO ELECTRONICS Inc
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Publication of US3894612A publication Critical patent/US3894612A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
    • H04R1/2869—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself
    • H04R1/2884—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself by means of the enclosure structure, i.e. strengthening or shape of the enclosure
    • H04R1/2888—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself by means of the enclosure structure, i.e. strengthening or shape of the enclosure for loudspeaker transducers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/26—Spatial arrangements of separate transducers responsive to two or more frequency ranges
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24132—Structurally defined web or sheet [e.g., overall dimension, etc.] including grain, strips, or filamentary elements in different layers or components parallel

Definitions

  • FIG.3B PRIOR ART FIG. 3A PRIOR ART FIG. 4C
  • FIG. 3C PRIOR ART PA'TFIS-JTEQJUL 15 I975 SHEET mum I. mumllmmiwa II II III IIW I! I III I i [all ⁇ III I Ill. .lll
  • FIGJB SPEAKER ENCLOSURE HAVING IMPROVED WALL PLATES BACKGROUND OF THE INVENTION 1.
  • This invention relates to a speaker enclosure and. in particular. to a speaker enclosure having improved wall plates.
  • FIG. I wherein thin lauan plywood sheets I and 2 are alternately laminated so that direction of the fibers of sheet I are substantially perpendicular to that of sheet 2.
  • FIG. 2 wherein wooden chips are formed into a particle plate" with a binder.
  • FIG. 3 wherein wooden billets 3 cut along the fibrous direction are bound to each other to form a core plate and thin wooden plates 4 are bound to both surfaces of the core plate so that the fibrous direction of billets is substantially perpendicular to that of plates 4.
  • This is known as lumber core plywood".
  • the plates of FIGS. 1 3. however. have defects in that the acoustic damping property thereof is not good and deformation is present in the damping wave.
  • the wall plate of a speaker enclosure is preferably made not of plywood but of a single plate insofar as the acoustic aspect is concerned; however. a single plate does not lend itself to practical use since it often warps and cracks and is impossible to mass-produce at a low cost.
  • FIG. 1(A) is a front view of a prior art lauan plywood speaker enclosure wall plate.
  • FIG. I(B) is a side view of the wall plate of FIG. 1(A).
  • FIG. 1(C) is a plan view of the wall plate of FIG. I(A).
  • FIG. 2(A) is a front view of a prior art particle plate, speaker enclosure wall plate.
  • FIG. 2(B) is a side view of the wall plate of FIG. 2(A).
  • FIG. 2(C) is a plan view of the wall plate of FIG. 2(A).
  • FIG. 3(A) is a front view of a prior art lumber core plywood. speaker enclosure wall plate.
  • FIG. 3(B) is a side view of the wall plate of FIG. 3(A).
  • FIG. 3(C) is a plan view of the wall plate of FIG. 3(A).
  • FIG. 4(A) is a front view of an illustrative embodiment of a lumber plate according to this invention.
  • FIG. 4(8) is a side view of the lumber plate of FIG. 4(A).
  • FIG. 4(C) is a plan view of the lumber plate of FIG. 4(A).
  • FIG. 5 is a perspective view of an illustrative speaker enclosure according to this invention.
  • FIG. 6 is a diagrammatic illustration of an observation apparatus for measuring the acoustic damping properties of various wall plates.
  • FIGS. 8A. B, and C respectively illustrate the characteristic curves of the acoustic damping property of 200 Hz. 250 Hz, and 300 Hz of the prior art wall plate of FIG. 2 measured by the observation apparatus of FIG. 6.
  • FIGS. 9A. B. and C respectively illustrate the characteristic curves of the acoustic damping property of 200 Hz, 250 Hz. and 300 Hz of the prior art wall plate of FIG. 3 measured by the observation apparatus of FIG. 6.
  • FIGS. IOA. B. and C respectively illustrate the characteristic curves of the acoustic damping property of 200 Hz, 250 Hz. and 300 Hz of the wall plate according to this invention of FIG. 4 measured by the observation apparatus of FIG. 6.
  • wood stock. such as pine or beech. is cut into billets 5 along the direction of the fibers thereof and the billets are bound to each other to obtain a lumber plate 6.
  • the billets may be bound together by conventional binding agents such as those described in the book entitled Wood- Gluing And Adhesive Agents" published by Morikita Shuppan Co.. Ltd., Apr. 30. I968. pages I68. I69 and 241.
  • At least one wall plate of speaker enclosure 7 comprises lumber plate 6, as shown in FIG. 5. where plate 6 includes speaker openings 6' for facilitating the mounting of speakers.
  • the acoustic damping property of lumber plate 6 may be observed by the apparatus of FIG. 6 where the signal of an oscillator 8 is applied to a tone-burst generator 9 and the output signal of generator 9 is amplified at an amplifier l0 and further applied to a vibration generator 11 to vibrate a specimen 12 corresponding to a wall plate or the like under test.
  • the vibration of specimen 12 is detected by a vibration pick-up 13 provided at the other end of specimen I2, and the vibration signal is amplified by an amplifier I4 and displayed at an oscilloscope 15 or the like.
  • FIGS. 7 I0 correspond to wave-forms observed in the oscilloscope and illustrate the damping states of each vibration beginning when vibration generator I1 stops.
  • reference letters A. B, and C of these figures represent the acoustic damping properties of 200 Hz, 250 Hz and 300 Hz. respectively.
  • the thickness of each of the plates of FIGS. 7 10 was l8 mm. and the direction of the applied signal was parallel with the direction of the fibers of the billets 3 of FIG.
  • FIGS. (A) 10(C) The acoustic damping property of the lumber plate of this invention is shown in FIGS. (A) 10(C) wherein the damping wave is a normal and undeformed waveform similar to a sine wave as compared with that of the lauan plywood of FIGS. 7(A) 7(C). the particle plate of FIGS. 8(A) 8(C'). and the lumber core ply wood of FIGS. 9(A) 9(C), the latter three exhibiting damping waves of the abnormal wave-forms having deformations.
  • the damping time during which the initial voltage of the base wave is reduced to 1/6 is 10/250 sec. for the lauan plywood, 6/250 sec. for the particle plate and the lumber core plywood. and 5/250 sec. for the lumber plate of this invention. as the 1 Hz is 1/250 sec. Accordingly, the damping time of the lumber core plate of this invention is the shortest of the wall plates.
  • E indicates Youngs modulus of the wood along the fiber line.
  • E indicates Young's modulus perpendicular to the fiber direction,
  • C indicates the acoustic communicating velocity of the wood along the fiber direction, and
  • C indicates the foregoing velocity perpendicular to the fiber direction.
  • the Youngs modulus and the acoustic communicating velocity of the plywoods become averaged.
  • the Young's modulus and the acoustic communicating velocity of the particle plate shown in the FIG. 2, which may be fiberless also becomes averaged.
  • the lumber plate according to this invention is produced by arranging the woods not per- 5 pendicularly but parallel with each other so that the favorable physical properties of the woods along the fiber flow can be fully utilized.
  • the area for bonding the bars 5 is very small compared with the conventional plywoods and thus the change of the acoustic property due to binder is reduced to a minimum.
  • the wall plate for the speaker enclosure according to this invention has a favorable acoustic clamping property where there is little, if any, deformation of the damping wave and a reduction of the damping time. Further, since the fiber flows of the bars 5 are parallel and the amount of the binder is very small, the sound of the enclosure is substantially improved. Furthermore, since a plurality of wood segments comprise each wall plate, the cost of producing the speaker enclosure is low when compared with enclosures made of solid plate. and the resulting wall plate of this invention does not crack or warp.
  • a speaker enclosure comprising at least one speaker, said speaker enclosure having at least one aperture for supporting said one speaker and including a plurality of wall plates where at least one plate comprises only a plurality of billets cut along the fibrous direction, the fibrous direction of all billets being substantially parallel to one another, the billets being bound to one another to form a substantially planar wall plate.

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  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)
  • Building Environments (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
US417197A 1973-02-09 1973-11-19 Speaker enclosure having improved wall plates Expired - Lifetime US3894612A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1973017223U JPS49120223U (enExample) 1973-02-09 1973-02-09

Publications (1)

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US3894612A true US3894612A (en) 1975-07-15

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Family Applications (1)

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US417197A Expired - Lifetime US3894612A (en) 1973-02-09 1973-11-19 Speaker enclosure having improved wall plates

Country Status (3)

Country Link
US (1) US3894612A (enExample)
JP (1) JPS49120223U (enExample)
GB (1) GB1456649A (enExample)

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2399177A1 (fr) * 1977-07-25 1979-02-23 Sony Corp Haut-parleur dynamique
US4173267A (en) * 1976-09-03 1979-11-06 Sony Corporation Speaker cabinet
US4223760A (en) * 1978-04-24 1980-09-23 Letourneau Ted L Loudspeaker assembly
US5284222A (en) * 1991-12-13 1994-02-08 Sony Corporation Speaker cabinet
USD913991S1 (en) * 2019-05-16 2021-03-23 Harman International Industries, Incorporated Illuminated loudspeaker
USD914639S1 (en) * 2019-05-16 2021-03-30 Harman International Industries, Incorporated Illuminated loudspeaker
USD916052S1 (en) * 2019-07-12 2021-04-13 Harman International Industries, Incorporated Illuminated loudspeaker
USD918173S1 (en) * 2019-05-16 2021-05-04 Harman International Industries, Incorporated Illuminated loudspeaker
USD921612S1 (en) * 2019-05-16 2021-06-08 Harman International Industries, Incorporated Illuminated loudspeaker
USD1012057S1 (en) 2021-08-20 2024-01-23 Harman International Industries, Incorporated Loudspeaker
USD1065149S1 (en) 2022-11-08 2025-03-04 Harman International Industries, Incorporated Loudspeaker
USD1065141S1 (en) 2022-11-08 2025-03-04 Harman International Industries, Incorporated Loudspeaker
USD1065143S1 (en) 2022-11-08 2025-03-04 Harman International Industries, Incorporated Loudspeaker
USD1065144S1 (en) 2022-11-08 2025-03-04 Harman International Industries, Incorporated Loudspeaker
USD1065145S1 (en) 2022-11-08 2025-03-04 Harman International Industries, Incorporated Loudspeaker
USD1065147S1 (en) 2022-11-08 2025-03-04 Harman International Industries, Incorporated Loudspeaker
USD1065146S1 (en) 2022-11-08 2025-03-04 Harman International Industries, Incorporated Loudspeaker
USD1065142S1 (en) 2022-11-08 2025-03-04 Harman International Industries, Incorporated Loudspeaker
USD1066300S1 (en) 2022-11-08 2025-03-11 Harman International Industries, Incorporated Loudspeaker
USD1066299S1 (en) 2022-11-08 2025-03-11 Harman International Industries, Incorporated Loudspeaker

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1736186A (en) * 1928-07-30 1929-11-19 Josephine M Butterworth Method of treating cypress
US3592290A (en) * 1967-11-21 1971-07-13 James C Armstrong Speaker cabinet enclosure and method of making same
US3730820A (en) * 1971-07-19 1973-05-01 W Fields Softwood-hardwood laminated panel
US3769143A (en) * 1971-09-08 1973-10-30 Int Paper Co Resin impregnated cellulosic veneer and laminated panels

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1736186A (en) * 1928-07-30 1929-11-19 Josephine M Butterworth Method of treating cypress
US3592290A (en) * 1967-11-21 1971-07-13 James C Armstrong Speaker cabinet enclosure and method of making same
US3730820A (en) * 1971-07-19 1973-05-01 W Fields Softwood-hardwood laminated panel
US3769143A (en) * 1971-09-08 1973-10-30 Int Paper Co Resin impregnated cellulosic veneer and laminated panels

Cited By (38)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4173267A (en) * 1976-09-03 1979-11-06 Sony Corporation Speaker cabinet
FR2399177A1 (fr) * 1977-07-25 1979-02-23 Sony Corp Haut-parleur dynamique
US4223760A (en) * 1978-04-24 1980-09-23 Letourneau Ted L Loudspeaker assembly
US5284222A (en) * 1991-12-13 1994-02-08 Sony Corporation Speaker cabinet
USD1012897S1 (en) 2019-05-16 2024-01-30 Harman International Industries, Incorporated Illuminated loudspeaker
USD1011314S1 (en) 2019-05-16 2024-01-16 Harman International Industries, Incorporated Illuminated loudspeaker
USD914639S1 (en) * 2019-05-16 2021-03-30 Harman International Industries, Incorporated Illuminated loudspeaker
USD918173S1 (en) * 2019-05-16 2021-05-04 Harman International Industries, Incorporated Illuminated loudspeaker
USD921612S1 (en) * 2019-05-16 2021-06-08 Harman International Industries, Incorporated Illuminated loudspeaker
USD944772S1 (en) 2019-05-16 2022-03-01 Harman International Industries, Incorporated Illuminated loudspeaker
USD981371S1 (en) 2019-05-16 2023-03-21 Harman International Industries, Incorporated Illuminated loudspeaker
USD1000419S1 (en) 2019-05-16 2023-10-03 Harman International Industries, Incorporated Illuminated loudspeaker
USD1000420S1 (en) 2019-05-16 2023-10-03 Harman International Industries, Incorporated Illuminated loudspeaker
USD1001775S1 (en) 2019-05-16 2023-10-17 Harman International Industries, Incorporated Illuminated loudspeaker
USD1008220S1 (en) 2019-05-16 2023-12-19 Harman International Industries, Incorporated Illuminated loudspeaker
USD1076879S1 (en) 2019-05-16 2025-05-27 Harman International Industries, Incorporated Illuminated loudspeaker
USD1030706S1 (en) 2019-05-16 2024-06-11 Harman International Industries, Incorporated Illuminated loudspeaker
USD1012068S1 (en) 2019-05-16 2024-01-23 Harman International Industries, Incorporated Illuminated loudspeaker
USD913991S1 (en) * 2019-05-16 2021-03-23 Harman International Industries, Incorporated Illuminated loudspeaker
USD916052S1 (en) * 2019-07-12 2021-04-13 Harman International Industries, Incorporated Illuminated loudspeaker
USD1012057S1 (en) 2021-08-20 2024-01-23 Harman International Industries, Incorporated Loudspeaker
USD1105033S1 (en) 2021-08-20 2025-12-09 Harman International Industries, Incorporated Loudspeaker
USD1099071S1 (en) 2021-08-20 2025-10-21 Harman International Industries, Incorporated Loudspeaker
USD1099073S1 (en) 2021-08-20 2025-10-21 Harman International Industries, Incorporated Loudspeaker
USD1099072S1 (en) 2021-08-20 2025-10-21 Harman International Industries, Incorporated Loudspeaker
USD1096689S1 (en) 2021-08-20 2025-10-07 Harman International Industries, Incorporated Light element for a loudspeaker
USD1096691S1 (en) 2021-08-20 2025-10-07 Harman International Industries, Incorporated Loudspeaker
USD1087057S1 (en) 2021-08-20 2025-08-05 Harman International Industries, Incorporated Loudspeaker
USD1065141S1 (en) 2022-11-08 2025-03-04 Harman International Industries, Incorporated Loudspeaker
USD1066299S1 (en) 2022-11-08 2025-03-11 Harman International Industries, Incorporated Loudspeaker
USD1066300S1 (en) 2022-11-08 2025-03-11 Harman International Industries, Incorporated Loudspeaker
USD1065142S1 (en) 2022-11-08 2025-03-04 Harman International Industries, Incorporated Loudspeaker
USD1065146S1 (en) 2022-11-08 2025-03-04 Harman International Industries, Incorporated Loudspeaker
USD1065147S1 (en) 2022-11-08 2025-03-04 Harman International Industries, Incorporated Loudspeaker
USD1065145S1 (en) 2022-11-08 2025-03-04 Harman International Industries, Incorporated Loudspeaker
USD1065144S1 (en) 2022-11-08 2025-03-04 Harman International Industries, Incorporated Loudspeaker
USD1065143S1 (en) 2022-11-08 2025-03-04 Harman International Industries, Incorporated Loudspeaker
USD1065149S1 (en) 2022-11-08 2025-03-04 Harman International Industries, Incorporated Loudspeaker

Also Published As

Publication number Publication date
JPS49120223U (enExample) 1974-10-15
GB1456649A (en) 1976-11-24
DE2359082B2 (de) 1976-04-01
DE2359082A1 (de) 1974-08-15

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