[go: up one dir, main page]

US2049767A - Loudspeaker and the like - Google Patents

Loudspeaker and the like Download PDF

Info

Publication number
US2049767A
US2049767A US13242A US1324235A US2049767A US 2049767 A US2049767 A US 2049767A US 13242 A US13242 A US 13242A US 1324235 A US1324235 A US 1324235A US 2049767 A US2049767 A US 2049767A
Authority
US
United States
Prior art keywords
disk
cone
loudspeaker
sound
varied
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
US13242A
Other languages
English (en)
Inventor
Glen Robert Rodger
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.)
GLEN S PATENTS AND HOLDINGS IN
GLEN'S PATENTS AND HOLDINGS Inc
Original Assignee
GLEN S PATENTS AND HOLDINGS IN
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 GLEN S PATENTS AND HOLDINGS IN filed Critical GLEN S PATENTS AND HOLDINGS IN
Priority to US48875A priority Critical patent/US2074173A/en
Application granted granted Critical
Publication of US2049767A publication Critical patent/US2049767A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • 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
    • H04R1/32—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
    • H04R1/34—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means
    • H04R1/345—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means for loudspeakers
    • 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

Definitions

  • This invention relates to improvements in loudspeakers and the like (for example, horns or hooters) and has for its object generally to provide means whereby the tone quality of a loudspeaker 5 or like instrument may be modified or adjusted,
  • a loudspeaker or like instrument which has a vibrating diaphragm or sound cone, with an associated sound screen or disk that is supported Within the sound cone in the path of the emitted sound, such disk being preferably in a plane transverse (for example, at right angles) to the cone axis and having its periphery disposed in spaced relation to the inner surface of the cone.
  • the disk is circular and concentric with the cone axis.
  • the disk may be supported by threads, from the wall of the cone, or, alternatively, it may be carried by an axial rod 20 supported at its other end on an external structure.
  • Still another object of the invention is to provide means associated with the disk which give it the form of a composite structure, whereby its diameter may be varied.
  • the invention accordingly comprises the features of construction, combination of elements, and arrangement of parts, which will be exemplified in the construction hereinafter set forth,
  • Fig. l is a diagrammatic view showing a vertical section of a sound cone for a loudspeaker provided with a screen disk in accordance with the invention
  • Fig. 2 is a section on the line 2-2 of Fig. 1 and looking in the direction of the arrows;
  • Fig. 3 is a Vertical section showing a modified form of loudspeaker provided with a screen disk according to the present invention
  • Fig. 4 is a fragmentary vertical section showing still another form of loudspeaker provided with a disk constructed so as to be capable of varying its diameter;
  • Figs. 5 and 6 are detailed elevational views showing the form of disk employed in the arrangement shown in Fig. 4.
  • a sound cone for a loudspeaker is shown at l; the cone having a full angle of and being preferably constructed of papierl3 mach or other suitable resonant material.
  • the cone is actuated in any convenient manner, for example, by means of an electrical driving unit connected to the apex, but not shown in the drawings in the interest of clearness of illustra- 20 tion.
  • a relatively thick disk 2 is disposed at a suitable distance from the apex in a 25 manner which intercepts sound.
  • the disk itself may be of any suitable to material, such as soft aluminum or celluloid, and is supported in place by elastic means, such as rubber threads 3 connecting its periphery to the Wall of the cone.
  • the diameter of the disk is such that an annular space is left between the disk and 35 the cone through which the sound is emitted.
  • the cone extends a substantial distance beyond the disk; for example, it may have a perimeter of fourteen inches (approxily thirty-five centimeters) at its widest part.
  • the disk 2 is rigidly attached to a screw-threaded rod 4 of steep pitch which is screwed into a central boss 5 of a supporting frame comprising three equally spaced arms 6 and a rim l disposed at the mouth of the cone.
  • a handwheel 8 is fixed to the end of the rod and by rotation of this wheel the distance of the disk from the apex of the cone may be adjusted, and it is found that by this adjustment a wide range of difference in the tone quality of the loudspeaker is obtained.
  • the disk takes the form of a composite structure comprising a plurality of overlapping metal plates l0 (arranged after the fashion of an iris diaphragm) pivoted at points H to a supporting disk [2.
  • Each plate has a slot l3 engaged by a pin i4 carried on a disk i5 and the slots and pins are so arranged and positioned that if the disk 15 is rotated relative to the disk [2 the pins in sliding along the slots will rotate the plates about their pivots l i causing them to move outwardly from the position shown in Fig. 6 to the expanded position shown in Fig. 5, or vice versa, thus causing the total area of the disk to be varied.
  • the material selected for the movable plates be chosen to give as little resonance as possible in use and that the various parts be assembled in such a manner that there is as little relative vibration as possible.
  • a suitable material for the movable plates is soft aluminum.
  • the supporting disk i2 is rigidly secured to a rod i! surrounded by an externally screwed tube 8 to which is attached the disk i5, and which is supported from the mouth of the cone in similar manner to the support for the rod 4 in Fig. 3.
  • the rod i? is provided with a handwheel l9 and the tube 8 with a handwheel 2G, and it will be seen that by rotation of the wheel 26 the composite disk and its associated parts will be moved axially of the cone without altering the size of the disk, while by rotating the wheel I nowadays relative to the wheel 23 the size of the disk will be varied.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
US13242A 1934-07-04 1935-03-27 Loudspeaker and the like Expired - Lifetime US2049767A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US48875A US2074173A (en) 1935-03-27 1935-11-08 Loudspeaker and the like

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB19709/34A GB440726A (en) 1934-07-04 1934-07-04 Improvements in or relating to loudspeakers and the like

Publications (1)

Publication Number Publication Date
US2049767A true US2049767A (en) 1936-08-04

Family

ID=10133889

Family Applications (1)

Application Number Title Priority Date Filing Date
US13242A Expired - Lifetime US2049767A (en) 1934-07-04 1935-03-27 Loudspeaker and the like

Country Status (3)

Country Link
US (1) US2049767A (fr)
FR (1) FR791720A (fr)
GB (1) GB440726A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3146848A (en) * 1958-08-25 1964-09-01 John O Fundingsland Hi-fidelity speaker

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3146848A (en) * 1958-08-25 1964-09-01 John O Fundingsland Hi-fidelity speaker

Also Published As

Publication number Publication date
FR791720A (fr) 1935-12-16
GB440726A (en) 1936-01-06

Similar Documents

Publication Publication Date Title
JP6553732B2 (ja) 無指向性スピーカーシステム用の音響ディフレクタ
US3881056A (en) Parabolic sound reflecting microphone holder
US2060098A (en) Device for emitting or receiving sound
US3638753A (en) Barrel speaker enclosure
US2049767A (en) Loudspeaker and the like
US2020705A (en) Acoustical diaphragm and mounting means
US2411804A (en) Radio kaleidoscopic projector
US2234007A (en) Acoustical apparatus
US2121008A (en) Acoustic translating device
US2106813A (en) Acoustic device
US2263408A (en) Means for improving the sound emitted by microphones, loudspeakers, and the like
US2049766A (en) Loudspeaker and like instrument
US2071828A (en) Loudspeaker, sound reproducing instrument, and the like
US2084944A (en) Acoustic device
US2074173A (en) Loudspeaker and the like
US2002189A (en) Acoustic device
US2396519A (en) Electroacoustical apparatus and method of using the same
US1904537A (en) Loud speaker
US1915217A (en) Loud speaker
US2494134A (en) Reentrant horn assembly
US1859892A (en) Acoustic device
US1637322A (en) Sound reproducer
US2356178A (en) Light control device
US2027520A (en) Shutter mechanism for motion picture projectors
US1809578A (en) Cone type loud speaker