CN101650935B - Optical drive sound producing device - Google Patents
Optical drive sound producing device Download PDFInfo
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- CN101650935B CN101650935B CN2009100677849A CN200910067784A CN101650935B CN 101650935 B CN101650935 B CN 101650935B CN 2009100677849 A CN2009100677849 A CN 2009100677849A CN 200910067784 A CN200910067784 A CN 200910067784A CN 101650935 B CN101650935 B CN 101650935B
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Abstract
The invention relates to an optical drive sound producing device. The sound producing device which comprises an optical source, an optical modulator, an optical amplifier, a transmission optical fiber and a sound producing film, wherein the strength of output light generated by the optical source is modulated by an audio signal through the optical modulator, and the output light is amplified by the optical amplifier and projected on the sound producing film; the sound producing film absorbs incident light to cause temperature change and lead an air layer approaching the sound producing film to generate thermal expansion changed along light strength so as to cause air medium density change and produce sound. The sound producing process generated in an optical drive way is a linear process, cause no harmonic distortion on a principle and has high sound producing fidelity. Compared with the prior electric sound producing device, the sound producing device does not need to use a magnet and a sound coil, thereby having no response to the external magnetic field and normally working in an environment with a strong electromagnetic field; and the sound producing device does not need to use metal or other conductor materials, and the energy needed by sound production can be transmitted in a space or by an optical fiber.
Description
[technical field]:
The present invention relates to a kind of sound-producing device, particularly a kind of sound-producing device that is driven by light signal belongs to optics and vocal skill field.
[background technology]:
Existing sound-producing device and device like loudspeaker (claiming loudspeaker again) and earphone, are a kind of microphone devices that converts electrical energy into acoustic energy.Though existing loudspeaker kind is a lot; Working method also is not quite similar; But all be to produce mechanical vibration on the sounding principle, promote ambient air, thereby make air dielectric produce the conversion that fluctuation realizes that electric energy arrives acoustic energy again to mechanical energy through certain vibrating mass.Loudspeaker can be divided into D.sp., electrostatic loudspeaker, and several kinds of flat panel speakers etc.Wherein, using at present is D.sp. the most widely.Common D.sp. generally is made up of basin frame, magnet, voice coil loudspeaker voice coil, vibration awl basin etc.When tone currents process voice coil loudspeaker voice coil, voice coil loudspeaker voice coil produces vibration under the effect in magnetic field.The awl basin that is fixed together with voice coil loudspeaker voice coil promotes the ambient air motion when vibrating, loudspeaker ambient air density is changed, and produce sound.The technical parameter of describing speaker performance has multiple, topmost comprising: effective frequency range, characteristic ssensitivity. specified maximum sinusoidal power, specified harmonic distortion etc.Along with the continuous development of loudspeaker manufacturing materials and technology and technology, the speaker product of various functions and different purposes all is developed.However, existing loudspeaker has determined them all to have following intrinsic problem by its sounding principle:
1. existing loudspeaker all is by current drives, and voice coil loudspeaker voice coil receives the interference of external environment easily and influences.For example, in the environment that strong-electromagnetic field exists, loudspeaker can receive the interference of electromagnetic field and noise occur, under the serious situation even can't use.
2. to existing loudspeaker, if realize good sounding effect, need its structure of appropriate design and choose various materials meticulously, also to consider its electric property, and and note amplifier between coupling.
3. the nonlinear characteristic of links such as electromagnetism, mechanical motion causes loudspeaker to produce higher hamonic wave in the existing loudspeaker, causes harmonic distortion easily, thereby influences the fidelity of sounding.
[summary of the invention]:
The present invention seeks to overcome the above-mentioned deficiency that prior art exists, a kind of novel sound-producing device is provided, particularly a kind of sound-producing device that drives by light signal.
This sound-producing device is different fully on type of drive and sound generating mechanism with the prior electric sound-producing device; It is with the momentum of light and energy drives sounding film, perhaps produces mechanical vibration, perhaps produces temperature variation; Or above-mentioned two kinds of actings in conjunction; Promote ambient air, make air dielectric produce fluctuation, realize by the conversion of luminous energy to acoustic energy.Compare with the prior electric sound-producing device, sound-producing device involved in the present invention need not to use magnet and voice coil loudspeaker voice coil, so magnetic field has no response to external world, can be in the environment that strong-electromagnetic field exists operate as normal; This sound-producing device need not to use metal or other conductor material, and the sounding energy needed can be transmitted by the space, or uses Optical Fiber Transmission.
The principle of work of optical drive sound producing device involved in the present invention: frequency is that the energy that the photon of v has is hv (h is a Planck's constant).When light incides on the non-reflective and nontransparent object, the energy of light will be absorbed, and causes its temperature to rise.And this object is as a thermal source, and heat can transmit to its surrounding medium.Medium is under the situation of still air around, heat will be mainly with heat conducting mode by this object to transfer of air.If the thermal capacity of this object is very little, then can the optical radiation energy that absorbed be passed to surrounding medium with very high efficient, i.e. the effect of this object is to realize by luminous energy to heat energy conversion.If the light intensity of incident light is time dependent, the temperature of this object also just changes in time, and heat conducting result makes that the density of still air produces over time around it, promptly produces sound field and in air, propagates.
Because heat and incident intensity that the radiation of object absorbing light is produced are linear; The variable density of the air that is caused by heat conduction is also linear with incident intensity; So; The voiced process that is produced by the optical drive mode is a linear process, can not cause harmonic distortion on the principle, has high sounding fidelity.On the other hand, this voiced process be by luminous energy to heat energy again to the transfer process of acoustic energy, in this transfer process, do not relate to electric signal, also need not to use conductive material.The conduction of light signal can use optical fiber to accomplish, so extraneous electromagnetic field can not produce any interference to the transmission of signal.
Consider the effect of photon momentum below.Frequency is that the momentum that the photon of v has is hv/C (C is the light velocity), and generally speaking, the momentum of photon is extremely small, and its effect can be ignored.The light pulse that when an energy is E is incided on the object with an angle of 90 degrees, and establishing its surface reflectivity is R, and all the other are all absorbed by object, and then object is (1+R) E/C by the momentum that incident light pulse obtains.If the width of incident light pulse is Δ t, then incident light pulse is (1+R) E/ (C Δ t) to the acting force of object.So for the high ultrashort laser pulse of peak power, its acting force to object will be to become obvious.If this object is a thickness as thin as a wafer during the film of (nm magnitude), the effect of laser pulse will cause the vibration of film, thereby cause that air dielectric produces fluctuation, produces sound.
The concrete structure of optical drive sound producing device provided by the invention comprises successively:
Light source: be used for producing output light;
Photomodulator: the sound signal according to input is modulated the output light intensity that light source produces;
Image intensifer: the light signal to after the light modulator modulates amplifies;
Transmission Fibers: the optical signal transmission after the image intensifer amplification is arrived the sounding film;
The sounding film: the light signal through the Transmission Fibers transmission incides on the sounding film; Sounding film absorption incident light, intensity variation cause that the sounding film temperature changes, make with the sounding film near air layer produce thermal expansion with intensity variation; Cause the air dielectric variable density, produce sound.
Described light source can be continuous light source, also can be light-pulse generator.
Specifically, described light source can be continuously the fiber laser of output, or the fiber laser of pulse output; Or the semiconductor laser of exporting continuously, or the semiconductor laser of pulse output.
Described image intensifer is a fiber amplifier.
Optical drive sound producing device provided by the invention also can adopt current driving circuit to realize that this device comprises successively:
Current drives source: be used to produce the drive current that receives the sound signal modulation;
Light emitting semiconductor device: be used to produce the output light of light intensity with drive current variations;
Transmission Fibers: optical signal transmission is arrived the sounding film;
The sounding film: the light signal through the Transmission Fibers transmission incides on the sounding film; Sounding film absorption incident light, intensity variation cause that the sounding film temperature changes, make with the sounding film near air layer produce thermal expansion with intensity variation; Cause the air dielectric variable density, produce sound.
Described light emitting semiconductor device is a semiconductor laser; Or semiconductor light-emitting-diode.
Advantage of the present invention and good effect:
Compare with the prior electric sound-producing device, sound-producing device involved in the present invention need not to use magnet and voice coil loudspeaker voice coil, so magnetic field has no response to external world, can be in the environment that strong-electromagnetic field exists operate as normal; This sound-producing device need not to use metal or other conductor material, and the sounding energy needed can be transmitted by the space, or uses Optical Fiber Transmission.
The voiced process that is produced by the optical drive mode is a linear process, can not cause harmonic distortion on the principle, has high sounding fidelity.
[description of drawings]:
Fig. 1 drives the sound-producing device structural representation for the photoabsorption modulation light signal.
Among the figure: 101 is light source; 102 is light intensity modulator; 103 is voltage amplifier; 104 is input audio signal; 105 is fiber amplifier; 106 is Transmission Fibers; 107 is the sounding body housing; 108 is the sounding film; 109 is sound field.
Fig. 2 drives the sound-producing device structural representation for the electrical modulation light signal.
Among the figure: 201 is the current drives source; 202 is the optical fibre output semiconductor luminescent device; 104 is input audio signal; 106 is Transmission Fibers; 107 is the sounding body housing; 108 is the sounding film; 109 is sound field.
Fig. 3 is the continuous light signal schematic representation of intensity modulated.Among the figure: 301 is light intensity change curve in time.
Fig. 4 is the pulsed optical signals synoptic diagram of intensity modulated.Among the figure: 401 is light intensity change curve in time.
The sounding film of Fig. 5 on substrate, making.Among the figure: 501 is incident light; 502 is the sounding film; 503 is substrate.
[embodiment]:
Embodiment 1:
Shown in accompanying drawing 1; Light source 101 adopts German Pilas, the PIL106 semiconductor laser that A.L.S.GmbH company provides, and this semiconductor laser promptly can produce continuous output; Also can produce pulse output, its output mode is set by its current control unit EIG1000D.The output wavelength of PIL106 semiconductor laser is 1060nm, and continuous power output is greater than 400mW.High speed variable fibre optic attenuator (VOA) the μ VOA302 that light intensity modulator 102 adopts U.S. BATI to provide.This VOA adopts electro-optic ceramics as switching material, and dynamic response time is 1 μ S, to the insertion loss of 1060nm wavelength less than 0.6dB.Dynamic attenuation scope 25dB, reflection loss is greater than 55dB.Electro-optic ceramics has very strong Kerr effect, and electrooptical coefficient is than big 2 one magnitude of the sour niobium of lithium, and half-wave voltage is far below lithium columbate crystal.Experiment finds that to the variable fibre optic attenuator of being selected for use, switching voltage is in the 100-150V scope.Light intensity modulator 102 is driven by voltage amplifier 103.The voltage amplifier circuit that voltage amplifier 103 adopts U.S. BATI to provide, its output signal voltage amplitude is adjustable continuously at 50V-150V.The signal input part of voltage amplifier 103 connects input audio signal 104.
Intensity is absorbed by sounding film 108 by the light signal of sound signal 104 modulation; Convert heat energy into; Make the temperature of sounding film 108 produce the variation with sound signal 104, this temperature variation causes that sounding film 108 with the thermal expansion that sound signal 104 changes, causes its ambient air density to change; Produce sound field 109, realize sounding.
Embodiment 2:
Shown in accompanying drawing 1, light source 101 adopts the PIL106 semiconductor laser, and its output mode is set at pulse output by its current control unit EIG1000D, and pulse width is elected 40ps as, and repetition frequency is set at 1MHz.The high speed variable fibre optic attenuator μ VOA302 that light intensity modulator 102 adopts U.S. BATI to provide, fiber amplifier 105 is the high-peak power pulse amplifier.The connected mode of various devices and embodiment 1 are similar.The pulse energy of sequence light pulse that different is by sound signal 104 through light intensity modulation, shown in accompanying drawing 4.Sounding film 108 is the goldleaf of thickness in sub-micrometer scale.The goldleaf surface is incided in light pulse, and a part of light is reflected, and a part is absorbed.Absorbed transform light energy is a heat energy, forms the voiced process identical with embodiment 1.Simultaneously, the momentum of light pulse makes goldleaf produce vibration, causes that air dielectric produces fluctuation, produces sound.
Embodiment 3:
Shown in accompanying drawing 2, light emitting semiconductor device 202 adopts the semiconductor laser of the fine output of U.S. JDSU company 6397 serial magnetic tape trailers.This semiconductor laser is that multimode is exported continuously, and its continuous output wavelength is 915nm, and maximum is output as 6.5W, and output tail optical fiber core diameter is 105 microns, and drive current is greater than 6A.THORLABSLDC340 semiconductor laser current drives source is adopted in current drives source 201, and sound signal 104 connects modulation input (MOD IN) end of LDC340.The output of the modulated semiconductor laser of light intensity is connected to sounding body housing 107 by Transmission Fibers 106, incides on the sounding film 108.Intensity is absorbed by sounding film 108 by the light signal of sound signal 104 modulation; Convert heat energy into; Make the temperature of sounding film 108 produce the variation with sound signal 104, this temperature variation causes that sounding film 108 with the thermal expansion that sound signal 104 changes, causes its ambient air density to change; Produce sound field 109, realize sounding.
Those skilled in the art are clear, and thought of the present invention can adopt the alternate manner beyond the above-named embodiment to realize.
Claims (5)
1. an optical drive sound producing device is characterized in that, this device comprises successively:
Light source: be used for producing output light; Described light source is continuously the fiber laser of output, or the fiber laser of pulse output;
Photomodulator: the sound signal according to input is modulated the output light intensity that light source produces;
Image intensifer: the light signal to after the light modulator modulates amplifies;
Transmission Fibers: the optical signal transmission after the image intensifer amplification is arrived the sounding film;
The sounding film: the light signal through the Transmission Fibers transmission incides on the sounding film; Sounding film absorption incident light, intensity variation cause that the sounding film temperature changes, make with the sounding film near air layer produce thermal expansion with intensity variation; Cause the air dielectric variable density, produce sound.
2. optical drive sound producing device according to claim 1 is characterized in that described image intensifer is a fiber amplifier.
3. an optical drive sound producing device is characterized in that, this device comprises successively:
Light source: be used for producing output light; Described light source is continuously the semiconductor laser of output, or the semiconductor laser of pulse output;
Photomodulator: the sound signal according to input is modulated the output light intensity that light source produces;
Image intensifer: the light signal to after the light modulator modulates amplifies;
Transmission Fibers: the optical signal transmission after the image intensifer amplification is arrived the sounding film;
The sounding film: the light signal through the Transmission Fibers transmission incides on the sounding film; Sounding film absorption incident light, intensity variation cause that the sounding film temperature changes, make with the sounding film near air layer produce thermal expansion with intensity variation; Cause the air dielectric variable density, produce sound.
4. optical drive sound producing device according to claim 3 is characterized in that described image intensifer is a fiber amplifier.
5. an optical drive sound producing device is characterized in that, this device comprises successively:
Current drives source: be used to produce the drive current that receives the sound signal modulation;
Semiconductor laser or light emitting diode: be used to produce the output light of light intensity with drive current variations;
Transmission Fibers: optical signal transmission is arrived the sounding film;
The sounding film: the light signal through the Transmission Fibers transmission incides on the sounding film; Sounding film absorption incident light, intensity variation cause that the sounding film temperature changes, make with the sounding film near air layer produce thermal expansion with intensity variation; Cause the air dielectric variable density, produce sound.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100677849A CN101650935B (en) | 2009-01-23 | 2009-01-23 | Optical drive sound producing device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100677849A CN101650935B (en) | 2009-01-23 | 2009-01-23 | Optical drive sound producing device |
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| Publication Number | Publication Date |
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| CN101650935A CN101650935A (en) | 2010-02-17 |
| CN101650935B true CN101650935B (en) | 2012-01-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009100677849A Expired - Fee Related CN101650935B (en) | 2009-01-23 | 2009-01-23 | Optical drive sound producing device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111491247B (en) * | 2020-03-17 | 2022-05-31 | 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 |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86201714U (en) * | 1986-03-21 | 1987-03-25 | 陈有卿 | Multi-function electronic door bell |
| CN2498029Y (en) * | 2001-12-10 | 2002-07-03 | 赵卫民 | Sensor and device against stealing badging |
-
2009
- 2009-01-23 CN CN2009100677849A patent/CN101650935B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86201714U (en) * | 1986-03-21 | 1987-03-25 | 陈有卿 | Multi-function electronic door bell |
| CN2498029Y (en) * | 2001-12-10 | 2002-07-03 | 赵卫民 | Sensor and device against stealing badging |
Non-Patent Citations (3)
| Title |
|---|
| JP平1-277000A 1989.11.07 |
| JP昭63-127700A 1988.05.31 |
| JP特开2002-186097A 2002.06.28 |
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