GB231420A - Improvements in sound-reproducing apparatus - Google Patents
Improvements in sound-reproducing apparatusInfo
- Publication number
- GB231420A GB231420A GB23690/24A GB2369024A GB231420A GB 231420 A GB231420 A GB 231420A GB 23690/24 A GB23690/24 A GB 23690/24A GB 2369024 A GB2369024 A GB 2369024A GB 231420 A GB231420 A GB 231420A
- Authority
- GB
- United Kingdom
- Prior art keywords
- diaphragm
- coil
- secured
- air
- horn
- 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
Links
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 abstract 1
- 239000011358 absorbing material Substances 0.000 abstract 1
- 239000004020 conductor Substances 0.000 abstract 1
- 229910052802 copper Inorganic materials 0.000 abstract 1
- 239000010949 copper Substances 0.000 abstract 1
- 229910052742 iron Inorganic materials 0.000 abstract 1
- 239000000696 magnetic material Substances 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/06—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
- H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
- H04R1/24—Structural combinations of separate transducers or of two parts of the same transducer and responsive respectively to two or more frequency ranges
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/02—Details
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/02—Details
- H04R9/04—Construction, mounting, or centering of coil
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
- Toys (AREA)
Abstract
231,420. British Thomson-Houston Co., Ltd., (Assignees of Kellogg, E. W.). March 27, 1924, [Convention date]. Magnetic instruments; diaphragms; loudspeakers.-A diaphragm adapted to vibrate as a whole is suspended so that its natural frequency is below the lowest important voice frequency. The first overtone is preferably above the voice range. In a moving coil instrument, the diaphragm is either in the form of two intersecting conical surfaces, Fig. 3, or parabolic, Fig. 4. The coil 2 is secured to a ring 6 which in Fig. 3 is secured to the diaphragm at the intersection of the two surfaces. The diaphragm is mounted by being secured to a rubber ring 8, Fig. 3, or by four threads 16, Fig. 4, adjustable in tension by means of screws 17. The air space behind the diaphragm is reduced by a plate 10 attached to the outer pole-piece 4 to raise its resonance above the voice frequencies, and vents 11 are formed in the plate 10 in order to reduce the sharpness of resonance. The air between the coil an'd the inner pole is vented by holes 9 in the ring 6. The air spaces may be damped with sound absorbing material. The form shown in Fig. 3 is used with a baffle-board 12, as described in Specification 231,421, but may be used with a horn. The form shown in Fig. 4 is used with a horn 14 with which a passage 13 down the inner pole-piece communicates. A cap 19 of non-magnetic material is secured to the inner pole-piece to reduce the air cavity at the entrance to the horn and a similar device may be used with the form shown in Fig. 3. The magnet used in either form may be a permanent one or mav be magnetized by a coil 5. If rectified alternating-current be supplied to the coil 5, the end 20 constitutes a shortcircuited turn of low-resistance by making it of copper. This may constitute the spool head, as shown, or may be spaced from it. and serves to steady the pulsating current. The spool head furthest from the air gap is either of iron or of non-conducting material. Specifications 227,162 and 229,759 are referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US702452A US1631646A (en) | 1924-03-27 | 1924-03-27 | Sound-reproducing apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB231420A true GB231420A (en) | 1925-08-20 |
Family
ID=24821277
Family Applications (3)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB23691/24A Expired GB231421A (en) | 1924-03-27 | 1924-10-07 | Improvements in sound-reproducing apparatus |
| GB23690/24A Expired GB231420A (en) | 1924-03-27 | 1924-10-07 | Improvements in sound-reproducing apparatus |
| GB28723/35A Expired GB464418A (en) | 1924-03-27 | 1935-10-17 | Improvements in or relating to sound reproducing apparatus |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB23691/24A Expired GB231421A (en) | 1924-03-27 | 1924-10-07 | Improvements in sound-reproducing apparatus |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB28723/35A Expired GB464418A (en) | 1924-03-27 | 1935-10-17 | Improvements in or relating to sound reproducing apparatus |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US1631646A (en) |
| BE (3) | BE417960A (en) |
| FR (3) | FR30476E (en) |
| GB (3) | GB231421A (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2445276A (en) * | 1945-05-04 | 1948-07-13 | Massa Frank | Electrodynamic loudspeaker |
| GB774121A (en) * | 1954-03-18 | 1957-05-08 | Ferranti Ltd | Improvements relating to gramophone pick-ups |
| US6704425B1 (en) * | 1999-11-19 | 2004-03-09 | Virtual Bass Technologies, Llc | System and method to enhance reproduction of sub-bass frequencies |
| FR2955445B1 (en) | 2010-01-15 | 2013-06-07 | Phl Audio | ELECTRODYNAMIC TRANSDUCER WITH DOME AND INTERNAL SUSPENSION |
| FR2955446B1 (en) | 2010-01-15 | 2015-06-05 | Phl Audio | ELECTRODYNAMIC TRANSDUCER WITH DOME AND FLOATING SUSPENSION |
| FR2955444B1 (en) | 2010-01-15 | 2012-08-03 | Phl Audio | COAXIAL SPEAKER SYSTEM WITH COMPRESSION CHAMBER |
-
1924
- 1924-03-27 US US702452A patent/US1631646A/en not_active Expired - Lifetime
- 1924-10-07 GB GB23691/24A patent/GB231421A/en not_active Expired
- 1924-10-07 GB GB23690/24A patent/GB231420A/en not_active Expired
-
1925
- 1925-03-26 FR FR30476D patent/FR30476E/en not_active Expired
- 1925-03-26 FR FR595818D patent/FR595818A/en not_active Expired
-
1935
- 1935-10-17 GB GB28723/35A patent/GB464418A/en not_active Expired
-
1936
- 1936-10-17 FR FR47708D patent/FR47708E/en not_active Expired
- 1936-10-17 BE BE417960D patent/BE417960A/xx unknown
-
1937
- 1937-05-28 BE BE421801D patent/BE421801A/xx unknown
-
1946
- 1946-09-14 BE BE324881D patent/BE324881A/xx unknown
Also Published As
| Publication number | Publication date |
|---|---|
| FR30476E (en) | 1926-07-17 |
| GB231421A (en) | 1925-09-17 |
| FR595818A (en) | 1925-10-09 |
| BE421801A (en) | 1937-06-30 |
| GB464418A (en) | 1937-04-19 |
| BE417960A (en) | 1936-11-30 |
| US1631646A (en) | 1927-06-07 |
| FR47708E (en) | 1937-06-22 |
| BE324881A (en) | 1949-09-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US3609253A (en) | Loudspeaker with improved voice coil suspension | |
| US3766334A (en) | Double voice coil loudspeaker | |
| US1886816A (en) | Magnetic sound reproducer | |
| GB231420A (en) | Improvements in sound-reproducing apparatus | |
| US2897291A (en) | Sound reproducer | |
| GB369030A (en) | Loud speaker | |
| CN204993838U (en) | Outer magnetic -type loudspeaker of cell -phone demagnetization | |
| GB310759A (en) | Improvements relating to electro-magnetic acoustic devices | |
| GB375538A (en) | Loud speaker | |
| GB545712A (en) | Improvements in and relating to loud speakers | |
| US1711514A (en) | Electromagnetic driving unit | |
| CN207947898U (en) | A kind of automatic identification vendor id loud speaker | |
| US1899561A (en) | Telephone receiver | |
| US1743749A (en) | Electroresponsive device | |
| US1852594A (en) | Means for converting sound into electrical impulses | |
| US1733013A (en) | Sound-reproducing device | |
| US1721217A (en) | Telephone receiver | |
| US1904156A (en) | Pneumatic sound reproducer | |
| US1643169A (en) | Telephone receiver | |
| GB341531A (en) | Loud speakers | |
| US1768903A (en) | Sound-producing device | |
| US1795214A (en) | Sound-reproducing apparatus | |
| US2509224A (en) | Electroacoustical transducer | |
| GB308318A (en) | Improvements in or relating to acoustic devices | |
| US1670193A (en) | Telephone receiver |