CN102685373A - Back light camera - Google Patents
Back light camera Download PDFInfo
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- CN102685373A CN102685373A CN2011100630996A CN201110063099A CN102685373A CN 102685373 A CN102685373 A CN 102685373A CN 2011100630996 A CN2011100630996 A CN 2011100630996A CN 201110063099 A CN201110063099 A CN 201110063099A CN 102685373 A CN102685373 A CN 102685373A
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Abstract
The invention discloses a back light camera which comprises a PWM (Pulse Width Modulation) signal generating circuit, a light source driving circuit and a light source switch induction control circuit, wherein the light source switch induction control circuit is respectively connected with the PWM signal generating circuit and the light source driving circuit; the PWM signal generating circuit is connected with the light source driving circuit; and the light source driving circuit further comprises a light source device which is used for emitting at least one light beam with a wavelength being 910-980 nanometers to an imaged object. The back light camera provided by the invention is ultra-long in service life which reaches one hundred thousand hours; and meanwhile, an LED (Light Emitting Diode) serves as the light source, so that the back light camera has the characteristics of convenience in operation, low energy consumption, environmental protection, and the like, and the cost is effectively lowered; the wavelength of the light beam emitting to the imaged object by the LED light source is 910-980 nanometers, and meanwhile the over exposure problem is solved; and the light is not reflected by the face of a shot person, the facial features are clearly distinguished and an image is free from white aperture, so that a monitored target is clearly displayed during a night monitoring process, the invisibility is strong and a monitoring position is difficult to be exposed.
Description
Technical field
The present invention relates to a kind of video camera, particularly a kind of black light video camera.
Background technology
Present video camera mainly contains passive and initiatively two kinds.Passive infrared itself is transmitting illuminant not, relies on sensing device induction extraneous light and heat to realize monitoring, mainly is divided into two kinds of thermal infrared imaging technology and lll night vision technology.
The thermal infrared imaging technology is that the temperature that relies on object and human body to give out shows object and human body image; So can only see the hot profile of people and object, do not see the true appearance of object, so it only is suitable for object and human detection; And cost is high; Primary Component import dependency degree is high, and selection face is little, can not satisfy the requirement of seeing persons or things on the safe protection engineering clearly; Certain moonlight, starlight and the surround lighting of lll night vision Technology Need just can be seen object; If not having light just can't see whatever; And imaging is prone to affected by environment; If run into the weather of continuous transformation, then image quality will receive very big influence, may occur in the situation that the imaging under some environment can't see at all; Active infra-red need improve auxiliary infrared light, relies on light emitted reflection to realize video monitoring, active visible light and the invisible light of being divided into, and visible light is problem because energy consumption and light pollution are easy to give away one's position etc., is mainly used in the public place at present.And the main at present infrared light filling floor light that carries out that uses 850nm of invisible light though this mode also can be seen target, exists infrared light sudden and violent, can not hiddenly observe, and is easier to expose light source position.Image is disturbed by light wave also can simultaneously, and imaging is easy affected by environment, if run into the weather of continuous transformation; Then image quality will receive very big influence; May occur in the situation that the imaging under some environment can't see at all, and have flashlight phenomenon that hot spot too concentrates and target and cross the problem that can have overexposure when near; Though have portioned product to be known as intelligence adjustment exposure rate, all fail to reach the effect of its propaganda through test.
Summary of the invention
Goal of the invention: to the problem and shortage of above-mentioned existing existence; It is high and disguised strong to the purpose of this invention is to provide a kind of night vision resolution; Be difficult for the black light video camera of exposure self monitoring position, solve monitor video overexposure problem at night simultaneously, people's face is not reflective; The clear resolution of facial characteristics, image does not have white aperture.
Technical scheme: for realizing the foregoing invention purpose; The technical scheme that the present invention adopts is a kind of black light video camera; Comprise PWM (pulse width modulation) signal generating circuit, light source driving circuit, light source switch inductive control circuit; Said light source switch inductive control circuit connects pwm signal generation circuit and light source driving circuit respectively; Pwm signal generation circuit connects light source driving circuit, and said light source driving circuit also comprises and being used for to the light supply apparatus of a branch of at least wavelength of imaging object emission at the light beam of 910-980 nanometer.
Preferred 940 nanometers of said wavelength.
Said light supply apparatus can be the LED lamp.
Beneficial effect: black light video camera overlength in useful life of the present invention reaches 100,000 hours; Owing to adopt LED as light source, have more and be convenient to operation simultaneously, energy consumption is low, the environmental protection characteristics, and has effectively reduced cost; Led light source is the 910-980 nanometer to imaging object emitted light beams wavelength; Making when monitoring night can clear display monitoring target and disguised strong; Be difficult for exposing self monitoring position, solve monitor video overexposure problem at night simultaneously, people's face is not reflective; The clear resolution of facial characteristics, image does not have white aperture.
Description of drawings
Fig. 1 is a pwm signal generation circuit diagram of the present invention;
Fig. 2 is light source driving circuit figure of the present invention;
Fig. 3 is light source switch inductive control circuit figure of the present invention;
Fig. 4 always schemes for control circuit for light source of the present invention.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment; Further illustrate the present invention; Should understand these embodiment only be used to the present invention is described and be not used in the restriction scope of the present invention; After having read the present invention, those skilled in the art all fall within the application's accompanying claims institute restricted portion to the modification of the various equivalent form of values of the present invention.
As shown in Figure 1, the base control IC was used to produce the adjustable pulse of PWM of circuit light modulation when NE555 was; Characteristics: be connected to R and RP between 3 ends and 6,2 ends; And C, simultaneously between 3 ends and 6,2 ends also and be connected with two diode 1N4148, so that the two way circuit of pulse to be provided; Form feedback simultaneously, improve the driving force of circuit.Duty ratio can be adjusted by VR1, and adjusting range is 0～100%, and the concussion cycle is confirmed by C and R jointly, and N channel switches MOSFET pipe BSS123 place among Fig. 3 is delivered in the pulse that this circuit produces.
As shown in Figure 2, pwm signal exports N-channel MOS FET pipe Q2 and Q3 place to, the light on and off of control LED.This MOSFET pipe adopts the MOSFET pipe of American TI Company, and model is IRFR024N, and chip drives electric current maximum can reach 17A, VDSS=55V, and RDS (ON)=0.075 Ω have the high-power driving ability, and the circuit caloric value is low.
As shown in Figure 3, driver part adopts photo resistance RL induction extraneous light, and whether control impuls exports the LED controlling and driving MOSFET pipe Q1 among Fig. 3 to.When extraneous light was dark, the impedance of photo resistance RL was risen, and the magnitude of voltage that is induced to the BSS123 grid raises, the conducting of BSS123 source drain, and pwm control signal exports MOSFET pipe Q2, the Q3 place of Fig. 2 to, and LED is bright.When extraneous light was bright, the impedance of photo resistance descended, and the magnitude of voltage that is induced to the BSS123 grid reduces, and the BSS123 source drain ends, and pwm control signal turn-offs, and output low level is to MOSFET pipe Q2 and the Q3 place of Fig. 2, and Q2 and Q3 end, and LED goes out.
Preferred 940 nano wave lengths of LED of the present invention.Reason is: though human eye can't see the light of wavelength in the 910-980 nanometer fully, can satisfy the disguised requirement of shooting, wavelength is long more, and the sensitivity of video camera is low more, and the image effect of demonstration is poor more; On the other hand, wavelength slight red sudden and violent phenomenon can occur at the light of 910-940 nanometer, influence the light absorption of video camera, and wavelength is short more, and red sudden and violent phenomenon is obvious more, therefore, and with the first-selected wavelength of 940 nanometers as black light video camera LED.Because LED is as most important electronic devices and components of black light video camera, the night vision visual effect finally depends on the quality of black light lamp.Widely-used 12mil of LED and 14mil wafer, great power LED adopts the 20mil wafer, and photoelectric conversion efficiency is high, and caloric value is low, brightness is high, the life-span is long, is difficult for depleted.LED colloid material degree of purity is apparently higher than like product, and light transmittance is higher.Circuit adopts PWM to drive power supply and considers good heat radiating, thereby can effectively improve the LED life-span, the actual useful life of LED as long as five years more than.
The present invention does not receive the influence of ambient lighting, and daytime, image color was gorgeous; Absorb same video image, no red sudden and violent night under different illumination conditions such as zero illumination, low-light.Can complete hidden work under complete black environmental condition, safe and reliable, satisfy the needs of hidden monitoring at night.Video image after optics and digital processing; Filtering other interference and noise; Solve monitor video overexposure problem at night simultaneously, people's face is not reflective, the clear resolution of facial characteristics; Image does not have white aperture, and the image that the image that under zero illumination, absorbs absorbs when visible light is arranged is clear equally.Being fit to very much safety monitoring engineering and other needs strengthens hidden and the for example use in places such as administration, finance, army, military service of place high quality graphic.And the characteristics that long service life arranged, effectively reduce cost.
Claims (3)
1. black light video camera; Comprise pwm signal generation circuit, light source driving circuit, light source switch inductive control circuit; Said light source switch inductive control circuit connects pwm signal generation circuit and light source driving circuit respectively; Pwm signal generation circuit connects light source driving circuit, it is characterized in that: said light source driving circuit also comprises and being used for to the light supply apparatus of a branch of at least wavelength of imaging object emission at the light beam of 910-980 nanometer.
2. according to the said black light video camera of claim 1, it is characterized in that: said wavelength is 940 nanometers.
3. according to claim 1 or 2 said black light video cameras, it is characterized in that: said light supply apparatus is the LED lamp.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100630996A CN102685373A (en) | 2011-03-16 | 2011-03-16 | Back light camera |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100630996A CN102685373A (en) | 2011-03-16 | 2011-03-16 | Back light camera |
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| Publication Number | Publication Date |
|---|---|
| CN102685373A true CN102685373A (en) | 2012-09-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011100630996A Pending CN102685373A (en) | 2011-03-16 | 2011-03-16 | Back light camera |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104301672A (en) * | 2014-09-29 | 2015-01-21 | 北京环境特性研究所 | Night vision monitoring system |
| US10839659B2 (en) | 2018-10-17 | 2020-11-17 | Arlo Technologies, Inc. | System for video monitoring with improved image quality |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201114547Y (en) * | 2007-05-28 | 2008-09-10 | 戴宏 | A motor car and ship night view device |
| CN101731023A (en) * | 2007-05-16 | 2010-06-09 | 托尼·迈耶 | Constant light output illuminator system |
| US20100152541A1 (en) * | 2008-06-23 | 2010-06-17 | Intubrite, Llc | Laryngoscope and Method of Use |
| CN202035078U (en) * | 2011-03-16 | 2011-11-09 | 南通辰玉光电实业有限公司 | Black light camera |
-
2011
- 2011-03-16 CN CN2011100630996A patent/CN102685373A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101731023A (en) * | 2007-05-16 | 2010-06-09 | 托尼·迈耶 | Constant light output illuminator system |
| CN201114547Y (en) * | 2007-05-28 | 2008-09-10 | 戴宏 | A motor car and ship night view device |
| US20100152541A1 (en) * | 2008-06-23 | 2010-06-17 | Intubrite, Llc | Laryngoscope and Method of Use |
| CN202035078U (en) * | 2011-03-16 | 2011-11-09 | 南通辰玉光电实业有限公司 | Black light camera |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104301672A (en) * | 2014-09-29 | 2015-01-21 | 北京环境特性研究所 | Night vision monitoring system |
| CN104301672B (en) * | 2014-09-29 | 2017-06-09 | 北京环境特性研究所 | A kind of night vision monitoring system |
| US10839659B2 (en) | 2018-10-17 | 2020-11-17 | Arlo Technologies, Inc. | System for video monitoring with improved image quality |
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Application publication date: 20120919 |