CN110868510B - Camera light filling device and have its camera - Google Patents
Camera light filling device and have its camera Download PDFInfo
- Publication number
- CN110868510B CN110868510B CN201810986753.2A CN201810986753A CN110868510B CN 110868510 B CN110868510 B CN 110868510B CN 201810986753 A CN201810986753 A CN 201810986753A CN 110868510 B CN110868510 B CN 110868510B
- Authority
- CN
- China
- Prior art keywords
- light
- chip
- light supplement
- pin
- camera
- 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
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/56—Cameras or camera modules comprising electronic image sensors; Control thereof provided with illuminating means
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B15/00—Special procedures for taking photographs; Apparatus therefor
- G03B15/02—Illuminating scene
- G03B15/03—Combinations of cameras with lighting apparatus; Flash units
- G03B15/05—Combinations of cameras with electronic flash apparatus; Electronic flash units
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/70—Circuitry for compensating brightness variation in the scene
- H04N23/74—Circuitry for compensating brightness variation in the scene by influencing the scene brightness using illuminating means
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention discloses a camera light supplementing device and a camera with the same. The camera light filling device comprises: the light-emitting device comprises a first light supplement chip and a second light supplement chip, wherein the light emitted by the first light supplement chip is in a wave band of 650-850 nm, and the light emitted by the second light supplement chip is white light with a color temperature of 2700-6500K; the first light supplement chip and the second light supplement chip are simultaneously started, light emitted by the second light supplement chip is mixed with light emitted by the first light supplement chip to form exposure compensation light, the range of the ratio of the current intensity input to the first light supplement chip to the current intensity input to the warm white light is controlled to be 1: 10-1: 200, and the range of the ratio of the current intensity input to the first light supplement chip to the current intensity input to the second light supplement chip is controlled to be 1: 10-1: 200. The invention mixes the light of two different wave bands by analyzing the reflection properties of the face and the license plate, thereby improving the dazzling (glare) condition of the existing white light lamp and improving the face recognition and license plate recognition conditions.
Description
Technical Field
The invention relates to the technical field of video monitoring, in particular to a camera light supplementing device and a camera with the same.
Background
At present, in cameras for face recognition, vehicle recognition and night color images, because light rays in the night environment are seriously insufficient, most cameras usually use a white light lamp for light supplement, but light emitted by the light supplement lamp can cause certain glare to people, and because the face and the license plate can reflect light with certain wave bands, the recognition rate of the face and the license plate is influenced.
It is therefore desirable to have a solution that overcomes or at least alleviates at least one of the above-mentioned drawbacks of the prior art.
Disclosure of Invention
It is an object of the present invention to provide a camera fill-in light device that overcomes or at least alleviates at least one of the above-mentioned disadvantages of the prior art.
In order to achieve the above object, the present invention provides a camera light supplement device, which includes a light supplement light source, a lens, a mounting plate assembly and a current control circuit, wherein: the light supplementing light source is arranged on one side or two sides of a lens of the camera, the lens is arranged on a light emitting path of the light supplementing light source, and the light supplementing light source is installed on the camera through the installation plate assembly; wherein, the light filling light source includes: the light-emitting device comprises a first light supplement chip and a second light supplement chip, wherein light emitted by the first light supplement chip is within a wave band of 650-850 nm, and the second light supplement chip is white light with a color temperature of 2700-6500K; the first light supplement chip and the second light supplement chip are started simultaneously, light emitted by the second light supplement chip is mixed with light emitted by the first light supplement chip to form exposure compensation light, and the range of the ratio of the current intensity input to the first light supplement chip to the current intensity input to the second light supplement chip is controlled to be 1: 10-1: 200; the light supplementing light source adopts a packaging body structure, and the first light supplementing chip and the second light supplementing chip are fixed on the heat dissipation substrate through the heat conduction connecting layer; the first light supplement chip and the second light supplement chip are respectively connected with the light supplement light source and the current control circuit through corresponding packaging circuit pins, and the current control circuit controls the current transmitted to the first light supplement chip and the second light supplement chip.
Furthermore, the current control circuit comprises a first light supplement control circuit and a second light supplement control circuit, the output end of the first light supplement control circuit is connected with the packaging circuit pin of the first light supplement chip, and the output end of the second light supplement control circuit is connected with the packaging circuit pin of the second light supplement chip.
Further, the first light supplement control circuit is provided with a first light supplement input end and a first light supplement output end, and the first light supplement output end is connected with a packaging circuit pin of the first light supplement chip; the first light supplement control circuit comprises a first constant current driving chip, wherein the first constant current driving chip is provided with a switch output pin connected with the first light supplement input end through a diode, an LED current detection pin connected with the first light supplement input end through a resistor, a chip work enabling pin connected with a PWM pin of an external controller through a resistor, and a chip input voltage pin connected with the first light supplement input end; the current limiting circuit is arranged between the LED current detection pin and the first light supplement input end, and the LED current detection pin and the current limiting circuit are grounded; the first supplementary lighting input end is grounded through a first filter circuit; the switch output pin is connected with a first light supplement output end through a first energy storage capacitor; and a current stabilizing circuit is arranged between the anode and the cathode of the first light supplementing output end.
Further, the current limiting circuit comprises a first resistor and a second resistor which are connected in parallel; the first filter circuit comprises a first capacitor and a second capacitor which are connected in parallel; the current stabilizing circuit comprises a third capacitor and a fourth capacitor which are connected in parallel.
Further, the second light supplement control circuit is provided with a second light supplement input end and a second light supplement output end, and the second light supplement output end is connected with a packaging circuit pin of the second light supplement chip; the second light supplementing chip comprises a second constant current driving chip, and the second constant current driving chip is provided with a switch output pin connected with the anode of the output end through a second energy storage capacitor, a boosting pin connected between the switch output pin and the second energy storage capacitor L3 through a boosting capacitor, a power supply input pin connected with the second light supplementing input end, an output current feedback pin grounded through an RC filter circuit, and a constant current driving chip mode selection pin connected with a PWM pin of an external controller; and a second filter circuit is arranged between the second supplementary lighting input end and the ground, a capacitor C10 is connected between the anode and the cathode of the second supplementary lighting output end in a bridging manner, and the cathode of the second supplementary lighting output end is grounded through a resistor R4.
Further, the second filter circuit comprises a capacitor C7 and a capacitor C8 connected in parallel.
Further, the current intensity input to the first light supplement chip is 800mA, and the current intensity input to the warm white light is 5-10 mA.
Further, the power range of the first light supplement chip is 0.5W-3W, and the power range of the second light supplement chip is 0.05W-1W.
Furthermore, the irradiation areas of the first light supplement chip and the second light supplement chip are cone-shaped, light in an overlapping range formed by the two irradiation areas is the exposure compensation light, and the overlapping range is close to the first light supplement chip and the second light supplement chip.
Furthermore, the light emitted by the first light supplement chip is within a wave band of 700nm to 760nm, and the second light supplement chip is warm white light with a color temperature of 3000K.
The invention also provides a camera, which comprises the camera light filling device.
The invention relates to the field of monitoring equipment for shooting face recognition, vehicle recognition and night color images and the field of monitoring equipment with the functions integrated in a camera.
The invention mixes the light of two different wave bands by analyzing the reflection properties of the face and the license plate, thereby improving the dazzling (glare) condition of the existing white light lamp and improving the face recognition and license plate recognition conditions.
Drawings
FIG. 1 is a schematic diagram of an embodiment of a camera provided by the present invention;
fig. 2 is a schematic structural diagram of a fill-in light source of the package structure shown in fig. 1 according to an embodiment;
fig. 3 is a schematic structural diagram of a fill-in light source according to another embodiment of the package structure shown in fig. 1;
FIG. 4 is a side view of the fill-in light source of the package structure shown in FIG. 3;
fig. 5 is a schematic structural diagram of a light supplement light source according to another embodiment of the package structure shown in fig. 1;
fig. 6 is a schematic circuit diagram of the fill-in light source shown in fig. 2 and 3;
fig. 7 is a schematic circuit diagram of another circuit structure of the fill-in light source shown in fig. 2 and 3;
fig. 8 is a schematic diagram of a first fill-in light control circuit in the fill-in light source shown in fig. 1;
fig. 9 is a schematic diagram of a second fill-in light control circuit in the fill-in light source shown in fig. 1.
Detailed Description
In the drawings, the same or similar reference numerals are used to denote the same or similar elements or elements having the same or similar functions. Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
In the description of the present invention, the terms "central", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore, should not be construed as limiting the scope of the present invention.
As shown in fig. 1, the light supplement lamp provided in this embodiment includes a light supplement light source 1, a lens 2, a light supplement mounting substrate 3, and a current control circuit, wherein: the light supplementing light source 1 is arranged on one side or two sides of the lens 4 of the camera and used for supplementing light to the object to be shot under the condition of insufficient ambient light. Lens 2 is arranged on the light-emitting path of the light-compensating light source 1 to achieve the effect of condensing light through lens 2, so that the utilization rate and the light intensity of the light-compensating light source 1 are improved. The lens 2 generally adopts a total internal reflection lens, and can effectively adjust the propagation path of light rays emitted by the light supplementing light source, so that the light quantity of the light source can be reasonably and greatly utilized, and the light emitting angle of the lens can be met through the design of the lens. The lens 2 is fixedly mounted to the housing of the front end assembly 5 of the camera using glue dispensing. The current control circuit controls the magnitude of current transmitted to the light supplementing light source so as to control the luminous intensity of the light supplementing light source. The fill-in light source 1 is mounted on the front end module 5 of the camera through a fill-in mounting substrate 3, and the specific implementation manner of the fill-in mounting substrate 3 will be described in detail in the following embodiments.
In one embodiment, the light supplement light source 1 is configured by combining a first light supplement chip 11 and a second light supplement chip 12, light emitted from the first light supplement chip 11 is in a first wavelength band, light emitted from the second light supplement chip 12 is in a second wavelength band, and light emitted from the second light supplement chip 12 is mixed with light emitted from the first light supplement chip 11 to form exposure compensation light. The light supplementing light source of this embodiment improves the recognition rate of treating the shooting object through adjusting the wavelength of the first light supplementing chip in the first waveband, and this embodiment still sets up the second light supplementing chip on the basis of the first light supplementing chip, adjusts the color of the exposure compensation light mixed with the light emitted by the first light supplementing chip through the light emitted by the second light supplementing chip, makes the color of the mixed light emitted by the light supplementing light source softer, and avoids causing glare to people.
Preferably, the irradiation regions of the first light supplement chip 11 and the second light supplement chip 12 are cone-shaped, light in an overlapping range formed by the irradiation region of the first light supplement chip 11 and the irradiation region of the second light supplement chip 12 is the exposure compensation light, and the overlapping range is arranged adjacent to the first light supplement chip 11 and the second light supplement chip 12.
Those of ordinary skill in the art will recognize that: the complexion of the human face is generally divided into yellow, black and brown, the license plate generally adopts white characters with blue bottom, and the human face and the license plate with different complexion have reflection attributes with different degrees to spectra with different wavelengths.
One set of experimental data shows: the human face with different skin colors has the highest reflectivity when the wavelength is 650nm, and the human face reflectivity is gradually reduced after 650 nm. The higher the reflectivity, the more the light quantity received by the camera chip under the same condition, the easier the identification, so the light source with the wavelength larger than 650nm is selected.
Another set of experimental data shows: the white font of the license plate has higher spectral reflectivity in the whole range of 400 nm-800 nm, while the blue bottom has higher spectral reflectivity near 450nm of central wavelength, and has lower reflectivity in the waveband of 600 nm-800 nm, and the reflectivity begins to rise from 800 nm. Therefore, in order to better distinguish the license plate number, it is necessary to make the contrast of the ground color of the license plate and the reflection of the font part large. The light supplementing light source between 600nm and 800nm is used, the reflectance of the ground color of the license plate is low, the reflectance of the font is high, the contrast of the ground color and the font is the highest, and the light supplementing light source in the waveband range is used for supplementing light to a camera for identifying the license plate, so that the identification of the license plate number is facilitated.
Therefore, the embodiment integrates the recognition requirements of the human face and the license plate, and the wave band of the light supplement light source 1 is selected to be 650 nm-850 nm, so that the dazzling (glare) condition of the existing white light lamp can be improved, and the recognition of the human face and the license plate can be improved.
The spectrum having a wavelength band of 650nm to 850nm is mainly concentrated in the red region. In practical application, when the light source in the wave band is used on a road, a driver or a pedestrian is easy to mistakenly consider the red light in the traffic light when watching the light source at a distance, and the pedestrian is easily misled.
According to the theory of colorimetry, the color of the current light can be changed by mixing light of other colors into a light source of one color. In order to avoid that people mistake the supplementary lighting light source 1 with the waveband between 650nm and 850nm as the red light in the traffic light, the second supplementary lighting mode is adopted in the embodiment. And set the first wave band that first light filling chip 11 sent out light for 650nm ~ 850nm, the light that sends through second light filling chip 12 mixes with first light filling chip 11 sends out light, and the red light that first light filling chip 11 sent can be covered to this kind of mode of second light filling, consequently, both avoided the misleading user, can reach the demand of clear discernment people face and license plate moreover.
In order to prevent the supplementary lighting light source 1 from displaying red, the color of light emitted by the second supplementary lighting chip 12 may be white, and white light is mixed into red light, so that the red light emitted by red light can be lightened or lightened, and can be distinguished from red light emitted by the existing red traffic light. The implementation manner of the second light supplement chip 12 emitting white light is as follows: the blue light chip laser fluorescent powder can emit white light, and the ultraviolet light laser fluorescent powder also emits white light.
The number of the second fill-in chips 12 may be 1 or more (e.g., 2). The color temperature of the second light supplement chip 12 is between 2700k and 6500 k. The combination of the first light supplement chip 11 and the second light supplement chip 12 emitting white light can remove the red exposure phenomenon, does not generate glare, and is beneficial to improving the recognition success rate of the camera. In practical application, the light supplement lamp provided by this embodiment mainly has two application modes: the other mode is a face recognition mode and a license plate recognition mode, a 650-850 nm first light supplement chip 11 is used as a light supplement light source of the monitoring device, the power range of the first light supplement chip 11 is 0.5-3W, the power range of the second light supplement chip 12 is 0.05-1W, and white light power consumption is low. The other mode is that under the night full-color mode, the first light supplement chip 11 with the wavelength of 650nm to 850nm can be turned off, and the second light supplement chip 12 is used as a light supplement light source of the camera. The embodiment can realize multiple functions such as a night color mode, a face recognition mode, a license plate recognition mode and the like in the same camera.
In one embodiment, in order to make the fill-in light source 1 not display red, the color of the light emitted by the second fill-in chip 12 may be other colors, such as light emitting in a wavelength band of 450nm to 620 nm. Specifically, for example: such as yellow light with a central wavelength of 580nm, the color of the resulting mixed light is orange yellow. Also for example: the central wavelength of light emitted by the second light supplement chip 12 is 460nm blue light, and finally the color of light mixed by the second light supplement chip 12 and the first light supplement chip 11 with a waveband of 650nm to 850nm is purple light or partial blue light. Human eyes have different sensitivities to light with different colors, the light sensitivity coefficient of the human eyes to red light with the wavelength of 730nm is 0.00052, and the light sensitivity coefficient of the human eyes to blue light with the wavelength of 460nm is 0.06, so that the purple light and the blue light can be mixed only by mixing the blue light with small power, and the recognition of a license plate is not influenced.
As shown in fig. 2, in an embodiment, the first light supplement chip 11 and the second light supplement chip 12 are both LED chips, and the light supplement light source 1 adopts a package structure.
For example: the first light supplement chip 11 and the second light supplement chip 12 are packaged on a heat conduction plate group, the heat conduction plate group is installed on the light supplement installation substrate, the heat conduction plate group comprises a heat conduction connection layer (such as a eutectic layer or a silver glue layer) 6 and a heat dissipation substrate 7, and the first light supplement chip 11 and the second light supplement chip 12 are both fixed on the heat dissipation substrate 7 through the heat conduction connection layer 6. Wherein, the effect of heat conduction articulamentum 6 mainly reflects in: the first light supplement chip 11 and the second light supplement chip 12 are connected to the heat dissipation substrate 7, and the heat dissipation substrate 7 is welded to the light supplement mounting substrate 3.
The thermally conductive connection layer 6 has a heat conducting capacity, which enhances the heat dissipation capacity of the device. The heat dissipation substrate 7 can adopt a ceramic substrate, the ceramic substrate has excellent heat dissipation capacity, and the heat resistance is high, so that the working temperature of the light supplement light source 1 can be effectively reduced as the heat dissipation substrates of the first light supplement chip 11 and the second light supplement chip 12.
The light supplement mounting substrate 3 is an aluminum substrate, and the aluminum substrate is fixedly mounted on a front end component 5 of the camera through screws. At this time, the heat emitted in the light emitting process of the first light supplement chip 11 and the second light supplement chip 12 is conducted to the light supplement mounting substrate 3 from the heat dissipation substrate 7, then conducted to the front end assembly 5 of the camera through the light supplement mounting substrate 3, and finally dissipated to the external environment of the camera through the shell of the front end assembly 5.
In one embodiment, as shown in fig. 3 and 4, the first light supplement chip 11 and the second light supplement chip 12 are both LED chips, and the light supplement light source 1 is a package structure, wherein the plurality of first light supplement chips 11 and the plurality of second light supplement chips 12 are alternately arranged on the substrate at intervals. That is, the package structure may include one first light supplement chip with a power of 3W and a plurality of second light supplement chips with a power of 0.05W. The packaging structure can also comprise a plurality of first light supplement chips with the power of 1.5W and a plurality of second light supplement chips with the power of 0.05W, wherein the first light supplement chips and the second light supplement chips are alternately arranged on the substrate in a spaced mode. The package structure of this embodiment adopts a cob (chip on board) form, the substrate is the aforementioned aluminum substrate 3, and the first light supplement chip and the second light supplement chip at this time are directly electrically connected to the aluminum substrate 3, thereby omitting the silver paste and the package layer in the conventional package.
In one embodiment, as shown in fig. 5, the second light filling chip 12 is a phosphor layer 16 coated outside the first light filling chip 11. For example, if the color of the light emitted by the first light supplement chip 11 is red, the fluorescent powder layer 16 may be selected, and the light emitted by the fluorescent powder layer 16 is mixed with the red light emitted by the first light supplement chip 11, so that the color of the formed exposure compensation light can make the human eye slightly see or not see the light emitted by the first light supplement chip, thereby also playing a role in reducing red exposure.
In an embodiment, in the package structure, the first light supplement chip 11 and the second light supplement chip 12 may be connected in parallel as shown in fig. 6, where the first light supplement chip 11 has a first package circuit pin 13, and the second light supplement chip 12 has a second package circuit pin 14. The first light supplement chip 11 and the second light supplement chip 12 are respectively connected with a current control circuit outside the light supplement light source 1 through corresponding packaging circuit pins, that is, the first light supplement chip 11 is connected with the current control circuit outside the light supplement light source 1 through a first packaging circuit pin 13; the second light supplement chip 12 is connected to a current control circuit outside the light supplement light source 1 through a second package circuit pin 14.
In an embodiment, the first light supplement chip 11 and the second light supplement chip 12 may also be connected in series as shown in fig. 7, and at this time, both ends of a series circuit formed by the first light supplement chip 11 and the second light supplement chip 12 are connected to a current control circuit outside the light supplement light source 1 through the third package circuit pin 15.
In one embodiment, the current control circuit includes a first supplementary lighting control circuit 8 and a second supplementary lighting control circuit 9, wherein the first supplementary lighting control circuit 8 controls the magnitude of the current intensity input to the first supplementary lighting chip 11 in a constant current driving manner, and the current intensity is hereinafter referred to as a first supplementary lighting current intensity to control the light emitting intensity of the first supplementary lighting chip 11. The second light supplement control circuit 9 also controls the magnitude of the current intensity input to the second light supplement chip 12 in a constant current driving manner, and the current intensity is hereinafter referred to as a second light supplement current intensity to control the light emitting intensity of the second light supplement chip 12. The ratio of the first fill-in light current intensity to the second fill-in light current intensity is controlled within a range of 1: 10-1: 200, and practice proves that the ratio range does not make white light too dazzling, and can cover red light.
Fig. 8 shows an implementation manner of the first light supplement control circuit 8, and as shown in fig. 8, the first light supplement control circuit 8 has a first light supplement input terminal IR and a first light supplement output terminal, IRLEDO + is an anode of the first light supplement output terminal, IRLEDO-is a cathode of the first light supplement output terminal, and the anode IRLEDO + and the cathode IRLEDO-of the first light supplement output terminal are used for connecting a current input terminal of the first light supplement chip 11.
The first supplementary lighting control circuit 8 includes a first constant current driving chip UG1, and the model of the first constant current driving chip UG1 may be SYHV 13C. In the figure, pin 1 of the first constant current driving chip UG1 is a switch output pin, pin 2 is a ground loop pin, pin 3 is a test pin, pin 4 is a chip operation enable pin, pin 5 is a chip input voltage pin, and pin 6 is an LED current detection pin.
Fig. 9 shows an implementation manner of the second light supplement control circuit 9, and as shown in fig. 9, the second light supplement control circuit 9 has a second light supplement input terminal VIN and a second light supplement output terminal, the LED + is an anode of the second light supplement output terminal, the LED-is a cathode of the second light supplement output terminal, and the anode LED + and the cathode LED-of the second light supplement output terminal are used for connecting a current input terminal of the second light supplement chip 12.
The second supplementary lighting control circuit 9 includes a second constant current driving chip UW2, and the model of the second constant current driving chip UW2 may be TPS 54201. In the figure, pin 1 of the second constant current driver chip UW2 is a ground loop pin, pin 2 is a switch output pin, pin 3 is a power input pin, pin 4 is an output current feedback pin, pin 5 is a constant current driver chip mode selection pin, pin 6 is a boost pin, and pin 6 controls the SW output signal.
A second filter circuit 91 is arranged between the second supplementary lighting input terminal VIN and the ground, and the second filter circuit 91 comprises a capacitor C7 and a capacitor C8 which are connected in parallel, so as to filter the second supplementary lighting input terminal VIN and prevent the input voltage from being unstable. Pin 2 is connected to output LED + via a second energy storage capacitor L3. Pin 6 is connected between pin 2 and the second energy storage capacitor L3 through a boost capacitor C6. The boost capacitor C6 has a boost function, and controls the upper tube of the second light supplement control circuit 9 to be opened. Pin 3 is connected to the second supplementary lighting input terminal VIN. Pin 4 is connected to the output LED-via resistor R3, and pin 4 is also connected to ground via capacitor C9. The resistor R3 and the capacitor C9 form an RC filter circuit, and form a pole with the pin 4, so that the bandwidth and the stability of a loop are ensured. The pin 5 is connected with a PWM pin of the external controller, and the PWM signal transmitted to the pin 5 by the external controller controls the current output by the first light supplement control circuit 8. The duty ratio of the PWM determines the magnitude of the output current, and in this embodiment, the current of the warm white light is 1mA, and the duty ratio of the PWM is 1%.
And a capacitor C10 is bridged between the second light supplement output end anode LED + and the second light supplement output end cathode LED-, and a capacitor C10 is used for stabilizing the output second light supplement current intensity, reducing current fluctuation, ensuring that the second light supplement chip 12 works in a standard constant current mode as much as possible, and preventing the second light supplement chip 12 from flickering. The output end LED is grounded through a resistor R4, the resistor R4 is used for detecting the current flowing through the second light supplement chip 12, it is ensured that the current intensity flowing through the second light supplement chip 12 is a set current value, and the current intensity I =0.2V/R4 flowing through the second light supplement chip 12.
It should be noted that, when the first fill-in light chip 11 and the second fill-in light chip 12 are connected in parallel as shown in fig. 6, the first package circuit pin 13 of the package is connected to the first fill-in light output end IRLEDO +, IRLEDO-of the first fill-in light control circuit 8. And, a second package circuit pin 14 of the package is connected to a second fill light output terminal LED +, LED-of the second fill light control circuit 9.
When the first light supplement chip 11 and the second light supplement chip 12 are connected in series as shown in fig. 7, the third package circuit pin 15 of the package is connected to the first light supplement output terminal IRLEDO +, IRLEDO-of the first light supplement control circuit 8.
In one embodiment, the first light supplement chip 11 selects light with a wavelength of 700nm to 760nm, and the first light supplement chip 11 with a wavelength of 700nm to 760nm emits infrared light with a red color. The second light supplement chip 12 is warm white light with a color temperature of 3000K, and the color is yellow, so that the color of light obtained by mixing the 3000K warm white light with the first light supplement chip 11 with a wave band of 700-760nm is warm white and is yellow, the color can solve the dazzling problem caused by pure white light on one hand, and on the other hand, the red exposure problem of pure 700 plus 760nm wave band can be solved after the second light supplement, and the red light at the intersection can be prevented from being mistaken. In addition, the second light supplementing mode is beneficial to improving the contrast ratio under the infrared light supplementing effect of the face and the license plate. Preferably, the current intensity input to the first light supplement chip 11 by the first light supplement control circuit 8 is 800mA, and the current intensity input to the 3000K warm white light by the second light supplement control circuit 9 is 5-10 mA.
Finally, it should be pointed out that: the above examples are only for illustrating the technical solutions of the present invention, and are not limited thereto. Those of ordinary skill in the art will understand that: modifications can be made to the technical solutions described in the foregoing embodiments, or some technical features may be equivalently replaced; such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (11)
1. The utility model provides a camera light filling device which characterized in that, includes light filling light source (1), lens (2), mounting panel subassembly (3) and current control circuit, wherein: the light supplementing light source (1) is arranged on one side or two sides of a lens (4) of the camera, the lens (2) is arranged on a light emitting path of the light supplementing light source (1), and the light supplementing light source (1) is installed on the camera through the installation plate assembly (3);
wherein the fill-in light source (1) comprises: the device comprises a first light supplement chip (11) and a second light supplement chip (12), wherein light emitted by the first light supplement chip (11) is within a wave band of 650-850 nm, and light emitted by the second light supplement chip (12) is white light with a color temperature of 2700-6500K; under the face recognition and license plate recognition modes, the first light supplement chip (11) and the second light supplement chip (12) are simultaneously started, light emitted by the second light supplement chip (12) is mixed with light emitted by the first light supplement chip (11) to form exposure compensation light, and the range of the ratio of the current intensity input to the first light supplement chip (11) to the current intensity input to the second light supplement chip is controlled to be 1: 10-1: 200;
the light supplementing light source (1) adopts a packaging body structure, and the first light supplementing chip (11) and the second light supplementing chip (12) are fixed on the heat dissipation substrate (7) through the heat conduction connecting layer (6); the first light supplement chip (11) and the second light supplement chip (12) are respectively connected with the light supplement light source (1) and the current control circuit through corresponding packaging circuit pins, and the current control circuit controls the current which is transmitted to the first light supplement chip (11) and the second light supplement chip (12).
2. The light supplementing device of a camera according to claim 1, wherein the current control circuit comprises a first light supplementing control circuit (8) and a second light supplementing control circuit (9), an output terminal of the first light supplementing control circuit (8) is connected to a package circuit pin of the first light supplementing chip (11), and an output terminal of the second light supplementing control circuit (9) is connected to a package circuit pin of the second light supplementing chip (12).
3. The camera fill-in light device according to claim 2, wherein the first fill-in light control circuit (8) has a first fill-in light input terminal and a first fill-in light output terminal, and the first fill-in light output terminal is connected to a package circuit pin of the first fill-in light chip (11);
the first supplementary lighting control circuit (8) comprises a first constant current driving chip (UG1), wherein the first constant current driving chip (UG1) is provided with a switch output pin connected with the first supplementary lighting input end through a diode (D16), an LED current detection pin connected with the first supplementary lighting input end through a resistor R247, a chip work enabling pin connected with a PWM pin of an external controller through a resistor R246, and a chip input voltage pin connected with the first supplementary lighting input end;
a current limiting circuit (81) is arranged between the LED current detection pin and the first supplementary lighting input end, and the LED current detection pin and the current limiting circuit (81) are grounded; the first supplementary lighting input end is grounded through a first filter circuit (82); the switch output pin is connected with a first supplementary lighting output end through a first energy storage capacitor (L2); and a current stabilizing circuit (83) is arranged between the anode and the cathode of the first light supplementing output end.
4. The camera fill-in light device according to claim 3, wherein the current limiting circuit (81) comprises a first resistor (R249) and a second resistor (R248) connected in parallel; the first filter circuit (82) comprises a first capacitor (C273) and a second capacitor (C270) connected in parallel; the current stabilizing circuit (83) comprises a third capacitor (C274) and a fourth capacitor (C269) connected in parallel.
5. The camera fill-in light device according to claim 2, wherein the second fill-in light control circuit (9) has a second fill-in light input terminal and a second fill-in light output terminal, and the second fill-in light output terminal is connected to a package circuit pin of the second fill-in light chip (12);
the second light supplementing chip (12) comprises a second constant current driving chip (UW2), the second constant current driving chip (UW2) is provided with a switch output pin connected with the positive pole of an output end through a second energy storage capacitor (L3), a boosting pin connected between the switch output pin and the second energy storage capacitor L3 through a boosting capacitor (C6), a power supply input pin connected with a second light supplementing input end, an output current feedback pin grounded through an RC filter circuit, and a constant current driving chip mode selection pin connected with a PWM pin of an external controller;
and a second filter circuit (91) is arranged between the second supplementary lighting input end and the ground, a capacitor C10 is connected between the anode and the cathode of the second supplementary lighting output end in a bridging manner, and the cathode of the second supplementary lighting output end is grounded through a resistor R4.
6. The camera fill-in light device according to claim 5, characterized in that the second filter circuit (91) comprises a capacitor C7 and a capacitor C8 connected in parallel.
7. The light supplement device for a camera according to claim 1, wherein the current intensity input to the first light supplement chip (11) is 800mA, and the current intensity input to the second light supplement chip (12) is 5-10 mA.
8. The light supplement device for a camera according to claim 1, wherein the power range of the first light supplement chip (11) is 0.5W-3W, and the power range of the second light supplement chip (12) is 0.05W-1W.
9. The light supplement device for the camera according to claim 1, wherein the irradiation regions of the first light supplement chip (11) and the second light supplement chip (12) are cone-shaped, the light in the overlapping range formed by the two irradiation regions is the exposure compensation light, and the overlapping range is disposed adjacent to the first light supplement chip (11) and the second light supplement chip (12).
10. The light supplement device for a video camera of claim 1, wherein the first light supplement chip (11) emits light in a wavelength band of 700nm to 760nm, and the second light supplement chip (12) is warm white light with a color temperature of 3000K.
11. A camera comprising a camera fill-in device as claimed in any one of claims 1 to 10.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810986753.2A CN110868510B (en) | 2018-08-28 | 2018-08-28 | Camera light filling device and have its camera |
| PCT/CN2019/103117 WO2020043141A1 (en) | 2018-08-28 | 2019-08-28 | Video camera |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810986753.2A CN110868510B (en) | 2018-08-28 | 2018-08-28 | Camera light filling device and have its camera |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110868510A CN110868510A (en) | 2020-03-06 |
| CN110868510B true CN110868510B (en) | 2020-12-25 |
Family
ID=69651417
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810986753.2A Active CN110868510B (en) | 2018-08-28 | 2018-08-28 | Camera light filling device and have its camera |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110868510B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113453408B (en) * | 2020-03-26 | 2022-11-04 | 浙江宇视科技有限公司 | Light supplement drive control circuit and method and network camera |
| CN112034665B (en) * | 2020-09-15 | 2022-05-17 | Oppo（重庆）智能科技有限公司 | Flash lamp assembly and electronic equipment |
| CN114697482B (en) * | 2020-12-30 | 2023-08-29 | 杭州海康威视数字技术股份有限公司 | Hemispherical camera |
| CN114764207B (en) * | 2020-12-30 | 2023-08-25 | 杭州海康威视数字技术股份有限公司 | Light supplementing lamp for dome camera and dome camera |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106449617B (en) * | 2015-08-05 | 2019-04-12 | 杭州海康威视数字技术股份有限公司 | For generating the light source equipment and its light compensation method and device of light |
| CN206470945U (en) * | 2016-10-11 | 2017-09-05 | 杭州海康威视数字技术股份有限公司 | A kind of light compensating lamp recognized for vehicle license plate |
| CN206542494U (en) * | 2017-03-03 | 2017-10-03 | 上海传英信息技术有限公司 | Front camera light compensating apparatus |
| CN206790591U (en) * | 2017-05-18 | 2017-12-22 | 杭州海康威视数字技术股份有限公司 | The light compensating apparatus and video camera of video camera |
-
2018
- 2018-08-28 CN CN201810986753.2A patent/CN110868510B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN110868510A (en) | 2020-03-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110868510B (en) | Camera light filling device and have its camera | |
| CN208691388U (en) | A kind of supplementary lighting sources and light supplementing device of camera and video camera with it | |
| US9918366B2 (en) | Lighting device with variable color rendering | |
| US9240528B2 (en) | Solid state lighting apparatus with high scotopic/photopic (S/P) ratio | |
| JP5131377B2 (en) | Light control device and LED lighting system | |
| US9967928B2 (en) | Replaceable lighting fixture components | |
| CN101438630B (en) | Lighting device and lighting method | |
| EP2637224B1 (en) | Light emitting device, illumination apparatus and system using same | |
| CN208691390U (en) | A kind of supplementary lighting sources, light supplementing device of camera and video camera | |
| US9799243B2 (en) | Lighting devices including solid state emitter groups for illuminating printed material with enhanced vibrancy | |
| JP5152714B2 (en) | Light emitting device and lamp | |
| CN112424962A (en) | Light emitter conversion solid state lighting device providing spectral power distribution with enhanced perceived brightness | |
| CN111917990B (en) | Video camera | |
| CN110868511B (en) | Video camera | |
| WO2020043141A1 (en) | Video camera | |
| US20160076748A1 (en) | System and Apparatus for Dual LED Light Bar | |
| CN109027719A (en) | A kind of LED light source component and lighting device of adjustable color | |
| CN208691389U (en) | A kind of video camera | |
| CN110324538B (en) | Vehicle-mounted infrared camera system | |
| EP3972390A1 (en) | Automatic driving vehicle luminaire and automatic driving vehicle lighting system | |
| CN211600348U (en) | Make things convenient for COB light source of line design | |
| CN209086620U (en) | It is a kind of for improving the light-mixing structure of display device colour gamut and visual acuity | |
| CN208849846U (en) | A kind of video camera | |
| CN206786562U (en) | A kind of LED illumination lamp | |
| JPH10233534A (en) | Led display and display device using it |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |