US1952539A - Sound reproducing apparatus - Google Patents
Sound reproducing apparatus Download PDFInfo
- Publication number
- US1952539A US1952539A US416662A US41666229A US1952539A US 1952539 A US1952539 A US 1952539A US 416662 A US416662 A US 416662A US 41666229 A US41666229 A US 41666229A US 1952539 A US1952539 A US 1952539A
- Authority
- US
- United States
- Prior art keywords
- diaphragm
- sound
- screen plate
- reproducing apparatus
- sound reproducing
- 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
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
Definitions
- the invention relates to apparatus for the reproduction of sound in which the sound vibrations are transmitted to the air by means of a diaphragm having a relatively large surface.
- a screen plate is in most cases used for the'improvement of the reproduction of the lower notes by preventing a short-circuit of the air vibrations around the edge of the diaphragm.
- the screen plate is usually arranged '10 in such amanner that it is joined to the free edge of the diaphragm which may be of cone or other shape.
- an apparatus for the reproduction of sound having a diaphragm of relatively large surface and a screen plate wherein the screen plate is separated from the diaphragm by a funnel shaped member or similar sound channel which is joined at one end to the edge of the diaphragm and at the other end to an opening provided in the screen plate.
- This advantage can be further increased by arranging a conical shaped member co-axially 0 within the funnel shaped member so as to be supported thereby.
- a conical shaped diaphragm When a conical shaped diaphragm is used in the apparatus, the apices of With of sound, and is illustrated partly in section and partly in elevation.
- the drawing shows a screen plate 1 which is not arranged directly round the cone-shaped diaphragm 7 of a loundspeaker 6, but is separated from it by an intermediate member 2 in the form of a truncated cone.-
- the member 2 forms a channel for the transmission of sound from the diaphragm 7 to the outer air.
- the funnel shaped member is provided at the wider end thereof with a flange 3 which is secured to the screen plate 1.
- the dimensions of the member 2 at the narrow end thereof are substantially equal to those of the conical shaped diaphragm 7.
- the member 2 is disposed between the screen plate 1 and a stiifening plate 4 which are connected together by a series of supports 5.
- the stiffening plate 4 is connected in any desired manner to the frame 11 of the loudspeaker 6, which, with the exception of a portion which is broken away, is shown in elevation in the drawing.
- the edge of the diaphragm '7 is supported by the frame 11 of the loud speaker and a ring 12 of felt or other suitable material may be clamped between theframe 11- and the stiffening plate 4 so as to prevent leakage of air pressure between the diaphragm '7 and the cone shaped member 2.
- Aconical shaped hollow body 8 is arranged coaxially within the member 2 and is secured thereto, by means of a number of distance pieces 9 which transmit the vibrations created in the body. 8 to the said member 2.
- the apex of the hollow body 8 is strengthened, for example, by arranging therein a correspondingly shaped piece of wood 10 which is held in position by means of a screw or other fastening device. The screw bears against a metal cap applied exteriorly of the apex. of the body 8.
- the funnel shaped member 2 and the hollow body 8 are preferably made of a sheet of wood which is maintained under tension by layers of flexible material 9 and 10', respectively, aflixed thereto and thus has no tendency to develop resis of approximately the same size as that of the diaphragm.
Landscapes
- Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Diaphragms For Electromechanical Transducers (AREA)
- Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL339127X | 1929-07-26 |
Publications (1)
Publication Number | Publication Date |
---|---|
US1952539A true US1952539A (en) | 1934-03-27 |
Family
ID=19784637
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US416662A Expired - Lifetime US1952539A (en) | 1929-07-26 | 1929-12-26 | Sound reproducing apparatus |
Country Status (5)
Country | Link |
---|---|
US (1) | US1952539A (de) |
BE (1) | BE366478A (de) |
DE (1) | DE588742C (de) |
FR (1) | FR686786A (de) |
GB (1) | GB339127A (de) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2567829A (en) * | 1947-03-06 | 1951-09-11 | Suthann Robert Andree | Combined cabinet and chassis for mounting electrical components |
WO2012174159A1 (en) * | 2011-06-14 | 2012-12-20 | Rgb Systems, Inc. | Ceiling loudspeaker system |
US8631897B2 (en) | 2008-06-27 | 2014-01-21 | Rgb Systems, Inc. | Ceiling loudspeaker system |
EP2187659B1 (de) * | 2008-11-18 | 2015-05-13 | Sennheiser electronic GmbH & Co. KG | Lautsprechereinheit |
EP3684077A1 (de) * | 2019-01-17 | 2020-07-22 | Onkyo Corporation | Diffusor |
-
0
- BE BE366478D patent/BE366478A/xx unknown
-
1929
- 1929-12-05 DE DED59859D patent/DE588742C/de not_active Expired
- 1929-12-17 FR FR686786D patent/FR686786A/fr not_active Expired
- 1929-12-17 GB GB38658/29A patent/GB339127A/en not_active Expired
- 1929-12-26 US US416662A patent/US1952539A/en not_active Expired - Lifetime
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2567829A (en) * | 1947-03-06 | 1951-09-11 | Suthann Robert Andree | Combined cabinet and chassis for mounting electrical components |
US8631897B2 (en) | 2008-06-27 | 2014-01-21 | Rgb Systems, Inc. | Ceiling loudspeaker system |
EP2187659B1 (de) * | 2008-11-18 | 2015-05-13 | Sennheiser electronic GmbH & Co. KG | Lautsprechereinheit |
WO2012174159A1 (en) * | 2011-06-14 | 2012-12-20 | Rgb Systems, Inc. | Ceiling loudspeaker system |
EP3684077A1 (de) * | 2019-01-17 | 2020-07-22 | Onkyo Corporation | Diffusor |
Also Published As
Publication number | Publication date |
---|---|
BE366478A (de) | |
DE588742C (de) | 1933-11-25 |
FR686786A (fr) | 1930-07-30 |
GB339127A (en) | 1930-12-04 |
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