CN2640177Y - Self-mixing interference microphone with semiconductor laser - Google Patents
Self-mixing interference microphone with semiconductor laser Download PDFInfo
- Publication number
- CN2640177Y CN2640177Y CN 02211820 CN02211820U CN2640177Y CN 2640177 Y CN2640177 Y CN 2640177Y CN 02211820 CN02211820 CN 02211820 CN 02211820 U CN02211820 U CN 02211820U CN 2640177 Y CN2640177 Y CN 2640177Y
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- CN
- China
- Prior art keywords
- photoelectric conversion
- microphone
- conversion device
- laser
- battery
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- 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 - Fee Related
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Abstract
The utility model discloses a semi-conductor laser self-mixing interference microphone. A fixing plate is arranged on the inner sidewall of the outer housing of the microphone which is the joint part of the outer housing and the sound-sending cover of the microphone. A semiconductor laser is arranged on the upper part of one end of the fixing plate. A photoelectric conversion equipment is arranged in the center part of the fixing plate. A battery bracket is arranged on the other end of the fixing plate. A battery is arranged in the battery bracket. A hollow cylindrical fixing sound-absorbing film box is arranged on the outer side of the fixing plate. A diaphragm is arranged at the top of the fixing sound-absorbing film box. The inside surface of the diaphragm is arcuate and a reflect film is arranged in the center part of the diaphragm. Connecting the laser by the lead wire, the photoelectric conversion equipment, the power and the switch, and the output end of the photoelectric conversion equipment are connected with the microphone output socket by the signal output wire of the photoelectric conversion equipment. The utility model has the advantages that the structure is compact, the anti-electromagnetic performance is strong, and the timbre is good after amplifying.
Description
Technical field:
The utility model belongs to a kind of photoelectric conversion device, relates to a kind of microphone that audio signal is converted to the signal of telecommunication by laser specifically.
Background technology:
Its structure has coil, magnet mostly or has using electric field to exist in the existing microphone products, for example magneto-electric microphone, Electret Condencer Microphone etc., therefore it is bigger disturbed by external electromagnetic field, during through the amplifier amplification and by the audio amplifier playback, the sound articulation that existence is amplified is poor, noise is big, problems such as playback effect difference.
Summary of the invention:
The purpose of this utility model is according to the problems referred to above, provides a kind of anti-electromagnetic field interference performance strong semiconductor laser self-mixing interfere type microphone.
The utility model is realized as follows: microphone case and microphone send the microphone case medial surface of sound cover binding site to be provided with fixed head, one end top of fixed head is provided with semiconductor laser, the centre of fixed head is provided with photoelectric conversion device, the other end of fixed head is provided with battery mounting, battery is housed in the battery mounting, the fixed head outside is provided with fixedly absorptive membrane case of hollow cylinder, fixedly the top of absorptive membrane case is provided with the vibration sound film of curved of medial surface, and the vibration sound film centre is provided with reflective membrane.Connect laser, photoelectric conversion device, power supply and switch by lead, the output of photoelectric conversion device connects the microphone accessory power outlet by the photoelectric conversion device output line.
Its operation principle is by sound vibration sound film to be vibrated, thereby make the laser beam that is radiated on the reflective membrane carry the information relevant with the vibration sound film vibration regularity, and the flashlight with Doppler frequency shift feeds back in the laser chamber by original optical path, in laser chamber, power output is modulated, light signal after the modulation penetrates and exports by photoelectric conversion device amplification back from the laser afterbody, thereby realizes converting audio signal to the signal of telecommunication.
The utlity model has advantages such as compact conformation, anti-electromagnetic interference performance acoustical quality strong, after amplifying is good.
Description of drawings:
Fig. 1 is the utility model semiconductor laser self-mixing interfere type microphone structure schematic diagram.
Fig. 2 is the utility model integrated circuit figure.
Fig. 3 is the circuit diagram of the utility model photoelectric conversion device.
In Fig. 1 to Fig. 3,
1, microphone send sound cover 2, vibration sound film 3, reflective membrane 4, laser 5, photoelectric conversion device 6, laser and photoelectric conversion device power-polar curve 7, battery mounting 8, photoelectric conversion device output line 9, fixedly absorptive membrane case 10, laser base 11, photoelectric conversion device base 12, fixed head 13, laser and photoelectric conversion device positive source line 14, switch 15, microphone case 16, accessory power outlet 17, battery
In Fig. 2 and Fig. 3, LD: semiconductor laser R: resistance CD: triode 2CU
2A: photodiode K: switch
Embodiment:
As shown in Figure 1, the utility model includes microphone case 15 and microphone send sound cover 1, microphone case 15 medial surfaces of its binding site are provided with fixed head 12, on the laser base 10 that one end top of fixed head 12 is provided with semiconductor laser 4 is housed, on the photoelectric conversion device base 11 that the centre of fixed head 12 is provided with photoelectric conversion device 5 is housed, the other end of fixed head 12 is provided with battery mounting 7, battery 17 is housed in the battery mounting 7, fixed head 12 outsides are provided with fixedly absorptive membrane case 9 of hollow cylinder, fixedly the top of absorptive membrane case 9 is provided with the vibration sound film 2 of curved of medial surface, vibration sound film 2 centres are provided with reflective membrane 3, be connected the negative pole of battery 17 and an end of switch 14 with the power-polar curve 6 of photoelectric conversion device by laser, be connected the positive pole of battery 17 and the other end of switch 14 with the positive source line 13 of photoelectric conversion device by laser, the output of photoelectric conversion device 5 connects microphone accessory power outlet 16 by photoelectric conversion device output line 8.
Above-mentioned laser and photoelectric conversion device power-polar curve 6 are circuit general designations that the negative pole of the negative pole of laser 4 and photoelectric conversion device 5 links together, and described laser and photoelectric conversion device positive source line 13 are that the circuit that the positive pole of the positive pole of laser 4 and photoelectric conversion device 5 links together is referred to as.
Among Fig. 2 and Fig. 3, semiconductor laser LD is connected photodiode 2CU by lead respectively with resistance R 2, R1
2The positive pole of A and negative pole, 2CU
2The positive pole of A connects the base stage of triode CD9014, and the collector electrode of triode CD9014 is by the positive pole of resistance R 3, R4 and K switch connection battery, and emitter is wired to the negative pole of battery, draws output line on the collector electrode of triode CD9014.
During concrete the use, energized switch 14, laser 4 sends laser, on the reflective membrane 3 that the irradiate light that penetrates from the left side is provided with in vibration sound film 2 centres, laser beam has the information relevant with the vibration sound film vibration regularity and has the flashlight of Doppler frequency shift to return to be fed in the laser chamber and to laser power by former road after reflectance coating reflection modulates, light beam after the modulation be that light that the laser right side is penetrated together is admitted to and carries out difference frequency the photoelectric conversion device 5 directly from the laser afterbody, at last the signal of telecommunication that receives is inserted accessory power outlet 16 and waits to export.
Claims (1)
1, a kind of semiconductor laser self-mixing interfere type microphone, include microphone case (15) and microphone and send sound cover (1), it is characterized in that microphone case (15) and microphone send microphone case (15) medial surface of sound cover (1) binding site to be provided with fixed head (12), on the laser base (10) that one end top of fixed head (12) is provided with semiconductor laser (4) is housed, on the photoelectric conversion device base (11) that the centre of fixed head (12) is provided with photoelectric conversion device (5) is housed, the other end of fixed head (12) is provided with battery mounting (7), battery (17) is housed in the battery mounting (7), fixed head (12) outside is provided with fixedly absorptive membrane case (9) of hollow cylinder, fixedly the top of absorptive membrane case (9) is provided with the vibration sound film (2) of curved of medial surface, vibration sound film (2) centre is provided with reflective membrane (3), be connected the negative pole of battery (17) and an end of switch (14) with the power-polar curve (6) of photoelectric conversion device by laser, be connected the positive pole of battery (17) and the other end of switch (14) with the positive source line (13) of photoelectric conversion device by laser, the output of photoelectric conversion device (5) connects microphone accessory power outlet (16) by photoelectric conversion device output line (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02211820 CN2640177Y (en) | 2002-05-10 | 2002-05-10 | Self-mixing interference microphone with semiconductor laser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02211820 CN2640177Y (en) | 2002-05-10 | 2002-05-10 | Self-mixing interference microphone with semiconductor laser |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2640177Y true CN2640177Y (en) | 2004-09-08 |
Family
ID=34280821
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02211820 Expired - Fee Related CN2640177Y (en) | 2002-05-10 | 2002-05-10 | Self-mixing interference microphone with semiconductor laser |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2640177Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102427573A (en) * | 2011-12-09 | 2012-04-25 | 安徽大学 | Real-time voice signal receiving device based on self-mixing interference measuring method |
| CN102769814B (en) * | 2008-12-05 | 2015-07-01 | 清华大学 | Sounding device |
| CN104871562A (en) * | 2012-10-31 | 2015-08-26 | 沃寇族姆系统有限公司 | System and method for detection of speech related acoustic signals by using a laser microphone |
| CN111491247A (en) * | 2020-03-17 | 2020-08-04 | 广州视源电子科技股份有限公司 | Microphone hole plugging detection method and device, storage medium and related equipment |
-
2002
- 2002-05-10 CN CN 02211820 patent/CN2640177Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102769814B (en) * | 2008-12-05 | 2015-07-01 | 清华大学 | Sounding device |
| CN102427573A (en) * | 2011-12-09 | 2012-04-25 | 安徽大学 | Real-time voice signal receiving device based on self-mixing interference measuring method |
| CN104871562A (en) * | 2012-10-31 | 2015-08-26 | 沃寇族姆系统有限公司 | System and method for detection of speech related acoustic signals by using a laser microphone |
| CN104871562B (en) * | 2012-10-31 | 2018-01-05 | 沃寇族姆系统有限公司 | The system and method that the related acoustical signal of voice is detected by using laser microphone |
| CN111491247A (en) * | 2020-03-17 | 2020-08-04 | 广州视源电子科技股份有限公司 | Microphone hole plugging detection method and device, storage medium and related equipment |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |