US1838743A - Loud speaker - Google Patents
Loud speaker Download PDFInfo
- Publication number
- US1838743A US1838743A US269654A US26965428A US1838743A US 1838743 A US1838743 A US 1838743A US 269654 A US269654 A US 269654A US 26965428 A US26965428 A US 26965428A US 1838743 A US1838743 A US 1838743A
- Authority
- US
- United States
- Prior art keywords
- diaphragm
- casing
- plastic material
- loud speaker
- band
- 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; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
- H04R7/00—Diaphragms for electromechanical transducers; Cones
- H04R7/16—Mounting or tensioning of diaphragms or cones
- H04R7/18—Mounting or tensioning of diaphragms or cones at the periphery
Definitions
- the present invention relates to apparatus of the kind used for the roduction, transmission or reproduction of sound, more particularly, to loud-speaking telephones or microphones. Still, more particularly it concerns among these apparatus comprising a vibrating diaphragm of large surface known as diffusers.
- the invention consists essentially of a m particular form of construction of apparatus equipped with marginally unsupported diaphragms whereby the fragility of the latter in handling, use and transportation is eliminated.
- Apparatus equipped with large-sized diaphragms are known in the prior art in which the diaphragm presents a perfectly free ed e or border, while being supported, at t e point where it is acted upon, by the means adapted to cause it to vibrate.
- the reproduction of sounds is particularly good because deformations due to the fixing or attaching means clam ing the edge of the diaphragm more or less rm- 1y against supportin annuli or frames are entirely absent in t e reproduction.
- the only serious drawback they involve is that they are very delicate and sensitive and therefore easily broken when handled or' shipped.
- the present invention provides apparatus of the said sort wherein the element of fragility is obviated without any attendant inconvenience looked at from the viewpoint of freedom of vibration of the marginal portions of the diaphragm.
- the diaphragm of the curved or cone type of a definite geometric form (cone, m pyramid, paraboloid, etc.) is unsupported and free around its edges; in other words, it is not connected in any way, either elastically or otherwise, with the frame of the apparatus. Indeed, the edge is merely made to bear upon a band or strip of plastic material, such as rubber, or soft felt, preferably, conveniently interposed betweenthe edge of the diaphragm and the bodyof the apparatus.
- Figure 1 illustrates an approved form of the invention
- Fi re 2 illustrates a modification thereofinw ich phragms being arranged in a suitable housmg.
- annulusA made from soft rubber, very soft felt, or any simifor example, inside a grooved metal iece B which is shaped in accordance with t e contour of the tympanum.
- the piece B is sup- .portedby means of arms C radially disposed,
- Figure 2 illustrates a modified form of construction, according to which the band made from flexible or elastic material, A, is placed upon a bearing surface formed on: the openin of a box or case B serving as the body 0 the apparatus. Fixed upon said case B is also the motor case D by the aid of arms C.
- the band A may preferably present a certain inclination "8! with reference to the surface of the tympanum E so as to providea more favorable bearing, it being understood that such a slope could be provided also in the arrangement illustrated in Figure 1.
- the case .B may to moreover be provided upon the other side (not shown in the illustration) with a second opening and a second tympanum actuated by an extension of the rodlet F.
- the contact between the periphery of the vibrating diaphragm and the bearing band may be interrupted or discontinuous either b means of breaks or gaps in the band or el se because of notches or gaps formed in the circumference of the diaphragm,
- An acoustic device comprising a casing
- said layer of plastic material being arranged to have an active face inclined to the plane of the edge of said opening, a supporting member, a driving motor supported by said supporting member, and a large conical diaphragm supported solely by its operative connection with said driving motor and the contact of its peripheral edge with the inclined active face of said layer of plastic material.
- An acoustic device comprising a box like casing, openings in opposite sides of said casing, a layer of plastic material se cured to the edge of each opening, each of said layers of plastic material being arranged to have an active face inclined to the plane of the side of said casing a pair of diaphragms positioned Within said casing with their peripheral edges engaging the inclined faces of said layers of plastic material, a link connecting the apices of said diaphragm, a driving motor supported from one side oi said casing, and a driving connection from said driving motor to one of said diaphragms whereby said diaphragms are supported solely by said driving connection and by their peripheral engagement with said layvers of plastic material.
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Diaphragms For Electromechanical Transducers (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR35491T | 1928-05-03 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US1838743A true US1838743A (en) | 1931-12-29 |
Family
ID=8672366
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US269654A Expired - Lifetime US1838743A (en) | 1928-05-03 | 1928-04-13 | Loud speaker |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US1838743A (fr) |
| FR (2) | FR648162A (fr) |
| GB (1) | GB289489A (fr) |
-
1927
- 1927-04-29 FR FR648162D patent/FR648162A/fr not_active Expired
-
1928
- 1928-04-13 US US269654A patent/US1838743A/en not_active Expired - Lifetime
- 1928-04-28 GB GB12538/28A patent/GB289489A/en not_active Expired
- 1928-05-03 FR FR35491D patent/FR35491E/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR648162A (fr) | 1928-12-06 |
| FR35491E (fr) | 1930-03-10 |
| GB289489A (en) | 1929-07-29 |
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