GB798825A - A low sonic frequency crystal contact microphone - Google Patents
A low sonic frequency crystal contact microphoneInfo
- Publication number
- GB798825A GB798825A GB1301855A GB1301855A GB798825A GB 798825 A GB798825 A GB 798825A GB 1301855 A GB1301855 A GB 1301855A GB 1301855 A GB1301855 A GB 1301855A GB 798825 A GB798825 A GB 798825A
- Authority
- GB
- United Kingdom
- Prior art keywords
- crystal
- contact
- diaphragm
- microphone
- secured
- 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
- 239000013078 crystal Substances 0.000 title abstract 8
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 abstract 2
- 239000004020 conductor Substances 0.000 abstract 1
- 229910052802 copper Inorganic materials 0.000 abstract 1
- 239000010949 copper Substances 0.000 abstract 1
- 239000011889 copper foil Substances 0.000 abstract 1
- 238000013016 damping Methods 0.000 abstract 1
- 239000000835 fiber Substances 0.000 abstract 1
- 239000000523 sample Substances 0.000 abstract 1
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B7/00—Instruments for auscultation
- A61B7/02—Stethoscopes
- A61B7/04—Electric stethoscopes
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R17/00—Piezoelectric transducers; Electrostrictive transducers
- H04R17/02—Microphones
Landscapes
- Acoustics & Sound (AREA)
- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Medical Informatics (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Signal Processing (AREA)
- Molecular Biology (AREA)
- Surgery (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
- Piezo-Electric Transducers For Audible Bands (AREA)
Abstract
798,825. Piezo-electric instruments. MURCHIE TRADING CO., Ltd., and FOTHERGILL, L. Aug. 3, 1956 [May 5, 1955], No. 13018/55. Class 40 (4). In a piezo-electric microphone the crystal b3 is secured to a diaphragm a1 or a2 which is mounted in a resilient ring a3, this sub-assembly being mounted in a rigid body c1 carrying a rigid contact e5 which makes rigid contact with one exposed corner of one surface of the crystal b3. The microphone is stated to have a very good low-frequency response and to be particularly useful in stethoxopy. The alternative diaphragms a1, a2 are a contact diaphragm, and a diaphragm for use with a probe, respectively. The crystal unit B, which consists of the crystal b3 cemented between two bars or copper plates b2 and b4, and between two fibre washers b1 and b5 (one corner of the crystal being left exposed), is cemented in the recess of diaphragm a1 or a2. This sub-assembly is then mounted in the rubber ring a3 which is in turn mounted in the larger diameter portion of the aperture in the body c1, the copper foil conductors bc1, bc2 passing through c1 for connection to connecting tabs c2, c3 carried by segment c4. Segment c4 is located in the body c1, contact plate c5 is placed in position, and is secured to the body c1 by screws e1, e2. The back plate d1 and back strap d2 are then secured to contact plate c5 by screws e3, e4. The screw e5 is adjusted to make contact with the exposed corner of crystal b3, thus damping the crystal so that the microphone responds to contact-borne sounds but is relatively insensitive to airborne sounds.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1301855A GB798825A (en) | 1955-05-05 | 1955-05-05 | A low sonic frequency crystal contact microphone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1301855A GB798825A (en) | 1955-05-05 | 1955-05-05 | A low sonic frequency crystal contact microphone |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB798825A true GB798825A (en) | 1958-07-30 |
Family
ID=10015314
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1301855A Expired GB798825A (en) | 1955-05-05 | 1955-05-05 | A low sonic frequency crystal contact microphone |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB798825A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0325805A2 (en) * | 1987-12-31 | 1989-08-02 | Jochen Heimann | Recording device for the non-invasive measurement of waves, pressure and vibrations inside a human body humain |
-
1955
- 1955-05-05 GB GB1301855A patent/GB798825A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0325805A2 (en) * | 1987-12-31 | 1989-08-02 | Jochen Heimann | Recording device for the non-invasive measurement of waves, pressure and vibrations inside a human body humain |
| EP0325805A3 (en) * | 1987-12-31 | 1989-09-06 | Jochen Heimann | Recording device for the non-invasive measurement of waves, pressure and vibrations inside a human body humain |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| ES462476A1 (en) | Piezoelectric high polymer, multilayer electro-acoustic transducers | |
| GB1516770A (en) | Headphone cups incorporating audio transducers | |
| GB978202A (en) | Improvements in or relating to electro-acoustic transducers | |
| GB823241A (en) | Bender type piezoelectric transducer | |
| GB792742A (en) | Hearing aid | |
| GB804466A (en) | Improvements in piezoelectric transducers | |
| GB798825A (en) | A low sonic frequency crystal contact microphone | |
| GB851938A (en) | Improvements in and relating to electro-acoustical transducers | |
| GB869234A (en) | Transducer and vibratory diaphragm | |
| GB463766A (en) | Improvements in or relating to apparatus for generating electrical waves corresponding to fluid medium waves | |
| JPS644199A (en) | Electrostatic speaker | |
| JPS5776994A (en) | Electroacoustic transducer | |
| GB857413A (en) | Improvements in or relating to cone loudspeakers | |
| GB228102A (en) | Sound-reproducing instruments | |
| GB793546A (en) | Improvements in or relating to microphones | |
| US1586452A (en) | Loud-speaking apparatus of the electromagnetic type | |
| GB308474A (en) | Improvements in and relating to sound reproducing instruments | |
| GB1206917A (en) | Electroacoustic transducer | |
| GB601629A (en) | Improvements in or relating to mechanical vibratory devices | |
| JPS5669987A (en) | Loudspeaker unit | |
| JPS5324802A (en) | Multi-channel stereophonic reproducing system | |
| JPS5298515A (en) | Headphone | |
| GB793261A (en) | Improvements in and relating to electromechanical transducers | |
| GB127969A (en) | Improvements in Stethoscopes and like Hearing Appliances. | |
| JPS5558696A (en) | Acoustic system |