US1630008A - Cone-type loud speaker - Google Patents

Cone-type loud speaker Download PDF

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Publication number
US1630008A
US1630008A US34255A US3425525A US1630008A US 1630008 A US1630008 A US 1630008A US 34255 A US34255 A US 34255A US 3425525 A US3425525 A US 3425525A US 1630008 A US1630008 A US 1630008A
Authority
US
United States
Prior art keywords
diaphragm
cone
loud speaker
conical
sheet metal
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
US34255A
Other languages
English (en)
Inventor
Marcus C Hopkins
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.)
HOPKINS Corp
Original Assignee
HOPKINS CORP
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
Priority to NL21057D priority Critical patent/NL21057C/xx
Priority to BE334366D priority patent/BE334366A/xx
Application filed by HOPKINS CORP filed Critical HOPKINS CORP
Priority to US34255A priority patent/US1630008A/en
Priority to GB9728/26A priority patent/GB252685A/en
Priority to GB28790/26A priority patent/GB261426A/en
Priority to FR616148D priority patent/FR616148A/fr
Priority to DEH106714D priority patent/DE551526C/de
Application granted granted Critical
Publication of US1630008A publication Critical patent/US1630008A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/12—Non-planar diaphragms or cones

Definitions

  • This invention relates to electrical reproducing instruments, and more especially to loud speakers of the conical diaphragm type.
  • a device embodying the invent-ion can be used advantageously with a radio receiving set. and also is suited to various other uses as will'be understood by those skilled in the art.
  • the invention is directed particularly to structural features of the conical diaphragm and of its mounting whereby there is obtained an improved operation, a structure strong mechanically, and one durable in nature and economical to manufacture.
  • the conical diaphragm is relatively stiff and light, and near. its periphery is provided with one or more reverse bends so that the diaphragm is quite free to vibrate bodily and is not subyect to excessive bending action while in use. This results in much more satisfactory and accurate tone reproduction than can be realized with diaphragms of less stiffness, and of less freedom of bodily movement.
  • the invention also embraces a novel supporting structure for the diaphragm.
  • This comprises a simple and economically produced sheet metal frame to thecircular periphery of which the conical diaphragm is attached, and in the center of which an opening is provided into which the electrical mechanism for actuating the diaphragm may be inserted-the latter being removably secured to the supporting structure.
  • the electrical mechanism or movement for actuating the diaphragm is not claimed herein. but forms the subject matter ofmy copending application Serial, No. 35,425, filed June 6, 1925. Other electrical 1nove-.
  • ments can be used in place of the one here illustrated and described, but the latter cooperates well with this improved form of diaphragm-and its mounting, and brings out well the good sound producing characteristics of the diaphragm.
  • the electrical arrangernent is such that the vibration of its armature. is of small amplitude.
  • Such an arrangement is particularly suited for use with a conical diaphra-gmv which is very rigid and light in weight and restrained at the periphery as little as possible so that the diaphragm may vibrate substantially as a Whole instead of bending in the manner of an ordinary diaphragm.
  • Fig. 1 is a sectional view taken along the vertical center line of a loud speaker constructed inaccordance with this invention
  • Fig. 2 is a fragmentary sectional view 0 a modified form of conical diaphragm
  • Figs. 3, 4 and 5 are side. top and rear views. respectively, of the electrical movement for actuating the diaphragm
  • Fig. 6 is a view partly in cross section (and on a larger scale than Figs. 3, 4 and 5) of the electrical movement;
  • Fig. 7 is a view partly in cross section taken along the line 77 of Fig. 6, and
  • Fig. 8 is a rear elevation of the back of the instrument with the electrical movement removed.
  • the conical diaphragm 1 is preferably of large diameter, usually more than nine inches, and generally is made wholly or in large part of paper in order that it may be of light weight.
  • the pa er should be stiff.
  • a long fibered paper 0 porous structure and free from loading will serve well, and any sizing should be of the fibers before felting and not of the sheet after it has been formed up.
  • a layer of varnish or other'like material applied to a finished cone is likely to impair greatly its sound producing qualities. Brittleness in the cone is a esirable characteristic, provided the paper has at the same time sufficient toughness to withstand commercial transportation and ordinary handling during use.
  • a flat sheet of paper is first cut to form asector of the requlred radius and angle. This sector of paper is then creased oircumfen' enitally at a lesser radius or radii to mark out the line or lines on which the paper may he sharply bent to bring about the results desired by me.
  • the main portion of tlie diaphragm is enabled to vibrate substantially as a whole, that is to say, with little or no bending of the cone.
  • Any arrangement for supporting the diaphragm expensive, is attractive in appearance, and
  • the supporting structure for the diaphragm and for the electrical movement or electro magnetic actuating mechanism comprises a spun or pressedsheet' metal member 3- of. frusto conical shape having an offset rimwith a beaded edge 4 formed as shown by rolling the sheet metal edge over a wire fillet.
  • The'metal head 4 protects the edge of the cone. from mechanical injury.
  • the brim of the diaphragm lies flat against the metal rim and is preferably cemented thereto but is enough wider than the rim to provide the desired elastic su port for the cone.
  • the sheet metal member 3 is provided with a large central opening 5 into which the electrical movement. is removably inserted.
  • the sheet metal member 3 is preferably provided with openings asshown at 10, 11 and 12 for the purpose of facilitating the assage of sound waves from the. inside of t e instrument to the outer air.
  • the electrical movement comprises a U-shaped permanent-magnet 13, the two ends of which are slotted as indicated at 14 and 15. To one pole of the permanent magnet there is secured a soft iron pole piece 16.
  • the pole piece 16 is secured torthe permanent magnet by means of a. screw 17.
  • Threaded studs 18 and 19 constitute poles for the pole piece 16 andare adjustable therein, toward and away from each other.
  • a speciall formed block 20 of insulating materia, such as bakelite having recesses of proper size to receive the electro magv net coils 21 and'22, each of which surrounds one of the studs 18 and 19.
  • the central openings through the coils 21 and 22 are 0 the proper size to fit the unthreaded portions of studs 18 and 19.
  • the coils 21 and 22 should be securely gripped within the block 20 and if necessary they may be cemented in place.
  • the block 20 should make a snug fit between the arms of the pole piece 16, and the unthreaded portions of the studs 18 and 19 should lit snugly within the openings through the coils 21 and 22.
  • a very rigid soft iron armature or reed 23 is firmly bolted at one end to one diaphragm may abut.
  • poles and 12 may beot' orna- Y pole of the permanent magnet and its free end is' normally situated midway between the ends of the poles formed by studs 18 and 19. Normally j the polarity of these poles is the same and they are so adjusted that their magnetic attractions on the armature 23 are. equal and opposing.
  • a rod 24 is rigidly attached at one end to the armature 23 at a point between its secured end (and that part which is disposed between the electro magnet poles.
  • Rod 24 forms a connecting link between and functions to -transmit the vibrations of the armature 23 to the diaphragm 1. In order to provide a secure attachment to the center of the diaphragm, it
  • . is reinforced by means of a pair of conical ical vibratory diaphragm made 0 weight and stiff fibrous material having washers 26 secured together, with the diaphragm between, by means of. a hollow rivet 27through which the rod 24 extends.
  • Coils21 and 22 are so wound that current passing one way will cause an attrac tion of armature 23 toward one of the electro magnet poles and vice versa.
  • the diaphragm actuating mechanism including permanent magnet, armature, connecting link and coils forms a self contained unit which is mounted on a metal plate 28 through the medium of a Wooden block 29 to which the permanent magnet is secured by means of a three-armed clamping plate 30, which embraces the permanent magnet, and a pair of wood screws 31.
  • Plate 28 is secured to the sheet metal supporting member 3 by means of four machine screws 32.
  • a lifting handle 33 is attached to plate 28 and affords a convenient means for carrying the instrument about.
  • a loud speaker comprising a lar e conlight weight and stiff brous material with a relatively narrow peripheral portion formed by at least one forwardly projecting reverse bend disposed at an oblique angle to the axis of the cone, and supporting means for v the diaphragm engaging .said peripheral portion in the plane of a reverse bend and throughout a part only of the width of said peripheral portion.
  • a loud speaker comprising a large conical vibratory diaphragm made of light a plurality of reverse bends at the base of the cone. the outermost bend being disposed at an oblique angle with respect to theaxis of the cone, and supporting means for the dia phragm engaging said outermost bend in the plane thereof.
  • a loud speaker comprising a large cons ical vibratory diaphragm made of light weight. and stiff fibrous material having a reverse bend forming a brim flaring forwardly towards the apex of the cone at an oblique angle to the axis of the cone and a support for the diaphragm located at the concave side of the cone'and having a portion engaging said forwardly flaring brim in the plane thereof.
  • a loud speaker comprising a large conical vibratory diaphragm-made of a light Weight and stiff paper, bent sharply at the base of the cone to form an outwardly flaring brim, a flaring sheet metal support for said cone secured to the outer part of said brim but leaving said cone free to vibrate substantially without distortion, and means for actuating said diaphragm, substantially as described.
  • a loud-speaker having a large conical vibratory diaphragm made of light weight fibrous material, the peripheral portion of said diaphragmbeing bent forwardly to form a flaring brim facilitating vibratory movement of said diaphragm, a structure supporting said diaphragm and having a forwardly flaring periphery to which the flaring brim of'said diaphragm is secured, and means for actuating said diaphragm.
  • a loudspeaker having a frusto-conical sheet metal supporting member with an oilset outwardly flaring rim, and a large conical vibratory diaphragm made of light weight fibrous material and having its edge glued to the rim of said supporting member.
  • a frusto-conical sheet metal supporting member having a centralopening for the accom modation of actuating means, said supporting member having an offset outwardly flarin rim edged with a bead, and a large conica paper diaphragm having a forwardly 'fiaring brim seated on said rim and glued thereto, substantially as described.
  • a frusto-conical sheet metal supporting member having a central opening through which actuating means may be inserted, and having other openings for the free passage of air, and a large conical diaphragm of lightweight fibrous material with a bent rim, said rim being glued to and protected by the rim of said frnsto-conical support.
  • a dished metal supporting member having an edge portion engaging and supporting the cone at its peripheral portion and having at-its center an opening through which an actuating movement can be inserted.
  • a large conical vibratory diaphragm made of light weight and stiff fibrous material and a sheet metal member supporting the diaphragm and having an edge portion formed to provide an annular seat'for the edge of the cone.
  • actuating means housed between said diaphragm and said back, and a pedestal on which said sheet metal back is secured.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
US34255A 1925-06-01 1925-06-01 Cone-type loud speaker Expired - Lifetime US1630008A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
NL21057D NL21057C (xx) 1925-06-01
BE334366D BE334366A (xx) 1925-06-01
US34255A US1630008A (en) 1925-06-01 1925-06-01 Cone-type loud speaker
GB9728/26A GB252685A (en) 1925-06-01 1926-04-13 Cone type loud speaker
GB28790/26A GB261426A (en) 1925-06-01 1926-04-13 Cone type loud speaker
FR616148D FR616148A (fr) 1925-06-01 1926-05-14 Haut-parleur du type à diaphragme conique
DEH106714D DE551526C (de) 1925-06-01 1926-05-29 Lautsprecher mit von einem Resonanzkoerper getragener Grossflaechenkonusmembran

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US34255A US1630008A (en) 1925-06-01 1925-06-01 Cone-type loud speaker

Publications (1)

Publication Number Publication Date
US1630008A true US1630008A (en) 1927-05-24

Family

ID=21875256

Family Applications (1)

Application Number Title Priority Date Filing Date
US34255A Expired - Lifetime US1630008A (en) 1925-06-01 1925-06-01 Cone-type loud speaker

Country Status (6)

Country Link
US (1) US1630008A (xx)
BE (1) BE334366A (xx)
DE (1) DE551526C (xx)
FR (1) FR616148A (xx)
GB (2) GB261426A (xx)
NL (1) NL21057C (xx)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2810447A (en) * 1955-05-31 1957-10-22 Ford Motor Co Rear seat speaker
EP0627868A1 (en) * 1993-05-28 1994-12-07 Bose Corporation Loudspeaker driver surrounding

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2810447A (en) * 1955-05-31 1957-10-22 Ford Motor Co Rear seat speaker
EP0627868A1 (en) * 1993-05-28 1994-12-07 Bose Corporation Loudspeaker driver surrounding
US5418337A (en) * 1993-05-28 1995-05-23 Bose Corporation Loudspeaker driver surrounding

Also Published As

Publication number Publication date
GB261426A (en) 1927-04-21
NL21057C (xx)
GB252685A (en) 1927-06-02
FR616148A (fr) 1927-01-24
BE334366A (xx)
DE551526C (de) 1932-06-02

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