DE145809C - - Google Patents
Info
- Publication number
- DE145809C DE145809C DENDAT145809D DE145809DA DE145809C DE 145809 C DE145809 C DE 145809C DE NDAT145809 D DENDAT145809 D DE NDAT145809D DE 145809D A DE145809D A DE 145809DA DE 145809 C DE145809 C DE 145809C
- Authority
- DE
- Germany
- Prior art keywords
- projections
- openings
- membrane
- elastic
- grain
- 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.)
- Active
Links
- 239000012528 membrane Substances 0.000 claims description 11
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 9
- 229910052799 carbon Inorganic materials 0.000 claims description 8
- 239000003245 coal Substances 0.000 claims description 5
- 239000012811 non-conductive material Substances 0.000 claims description 4
- 238000013016 damping Methods 0.000 claims description 2
- 239000000843 powder Substances 0.000 claims 1
- 238000004904 shortening Methods 0.000 claims 1
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 239000013013 elastic material Substances 0.000 description 2
- 239000002775 capsule Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 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
- H04R21/00—Variable-resistance transducers
- H04R21/02—Microphones
- H04R21/021—Microphones with granular resistance material
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE145809C true DE145809C (OSRAM) |
Family
ID=413132
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DENDAT145809D Active DE145809C (OSRAM) |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE145809C (OSRAM) |
-
0
- DE DENDAT145809D patent/DE145809C/de active Active
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