CN216167339U - RGB mixed white light source with controllable color temperature - Google Patents
RGB mixed white light source with controllable color temperature Download PDFInfo
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- CN216167339U CN216167339U CN202122304299.8U CN202122304299U CN216167339U CN 216167339 U CN216167339 U CN 216167339U CN 202122304299 U CN202122304299 U CN 202122304299U CN 216167339 U CN216167339 U CN 216167339U
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Abstract
The utility model provides a color temperature controllable RGB mixed white light source, which comprises a light source module, a spectrum acquisition optical fiber, a spectrum sensor and a control module, wherein the light source module comprises a red light source, a blue light source, a green light source, a first dichroic mirror, a second dichroic mirror and a light outlet, the red light source sequentially passes through the second dichroic mirror and the first dichroic mirror to reach the light outlet, the green light source sequentially passes through the second dichroic mirror and the first dichroic mirror to reach the light outlet, and the blue light source sequentially passes through the second dichroic mirror and the first dichroic mirror to reach the light outlet, and then is mixed and output; the spectrum acquisition optical fiber acquires signals of the red light source, the blue light source and the green light source and transmits the signals to the spectrum sensor, and the spectrum sensor is electrically connected with the control module. By adopting the technical scheme of the utility model, the color temperature can be controlled accurately, and the color temperature of the output mixed white light can be stable.
Description
Technical Field
The utility model belongs to the technical field of illumination, and particularly relates to an RGB mixed white light source with controllable color temperature.
Background
Endoscope systems are widely used in medical and industrial fields, in which a light source system is one of important components of the endoscope system. Under different environments, white light sources with different color temperatures can exert different lighting effects. For example, when a medical endoscope is used to examine a patient, a doctor selects a light source with a proper color temperature according to a body part to be examined so as to obtain the best display effect; the color temperature of the light source needs to be kept stable during the examination process so as not to influence the judgment of a doctor on the affected part.
In order to be suitable for various environments, a light source is required to achieve a variable and stable color temperature output. And the color temperature of the common white light source is fixed and unchangeable, so that the applicability of multiple environments cannot be met. In addition, the technology adopts three monochromatic light sources of R (red), G (green) and B (blue) to mix into white light, although the color temperature of the mixed white light is adjustable, the accuracy is not high enough, and after the product is used for a long time, the service life attenuation speed of the three monochromatic light sources used inside is inconsistent, so that the white light mixed in the later-stage use process is caused, the actual color temperature and the target color temperature have larger and larger deviation, and the use requirement cannot be finally met.
SUMMERY OF THE UTILITY MODEL
Aiming at the technical problems, the utility model discloses an RGB mixed white light source with controllable color temperature, which is controllable in color temperature and stable in color temperature.
In contrast, the technical scheme adopted by the utility model is as follows:
a color temperature controllable RGB mixed white light source comprises a light source module, a spectrum acquisition optical fiber, a spectrum sensor and a control module, wherein the light source module comprises a red light source, a blue light source, a green light source, a first dichroic mirror for transmitting blue and reflecting red and green, a second dichroic mirror for transmitting red and reflecting blue and green and a light outlet, the red light source sequentially passes through the second dichroic mirror and the first dichroic mirror to reach the light outlet, the green light source sequentially passes through the second dichroic mirror and the first dichroic mirror to reach the light outlet, and the blue light source sequentially passes through the second dichroic mirror and the first dichroic mirror to reach the light outlet and is mixed and then output;
the red light source is electrically connected with the first driving module, the blue light source is electrically connected with the second driving module, the green light source is electrically connected with the third driving module, and the first driving module, the second driving module and the third driving module are electrically connected with the control module;
one end of the spectrum acquisition optical fiber is respectively positioned at the red light source, the blue light source and the green light source exit port, the other end of the spectrum acquisition optical fiber transmits signals to the spectrum sensor, and the spectrum sensor is electrically connected with the control module.
The first dichroic mirror has good light transmittance in most blue light spectrum wavelengths and almost totally reflects light outside the blue light spectrum wavelengths; the second dichroic mirror has good light transmittance for most of the red light spectral wavelengths and almost totally reflects light outside the red light spectral wavelengths.
By adopting the technical scheme, the signal collected by the spectrum collection optical fiber is fed back to the spectrum sensor, the tristimulus values can be obtained, the color coordinates and the color temperature of the mixed white light are further obtained, and the output power of the red light source, the blue light source and the green light source can be adjusted through the first driving module, the second driving module and the third driving module by comparing the tristimulus values with the set color temperature, so that the corresponding relative spectrum value is achieved, and the accurate control of color temperature change is realized.
As a further improvement of the present invention, the first dichroic mirror and the second dichroic mirror are sequentially located in an exit direction of the red light source, and form an included angle with collimated light of the red light source, the blue light source and the green light source are located at one side of the red light source, the green light source faces the second dichroic mirror, the blue light source faces the first dichroic mirror, and the light outlet is located in an exit direction of the collimated light of the blue light source.
As a further improvement of the utility model, the first dichroic mirror forms an included angle of 45 degrees with collimated light rays emitted by the red light source, the blue light source and the green light source; and the second dichroic mirror forms an included angle of 45 degrees with collimated light rays emitted by the red light source, the blue light source and the green light source.
As a further improvement of the present invention, the color temperature controllable RGB mixed white light source includes a driving control board, and the first driving module, the second driving module, the third driving module, the control module, and the spectrum sensor are located on the driving control board.
As a further improvement of the utility model, the spectrum sensor is provided with a diffusion sheet, and the spectrum collection optical fiber transmits the optical signal to the spectrum sensor through the diffusion sheet.
As a further improvement of the utility model, the spectrum collecting optical fiber is connected with the driving control board through an optical fiber fixer.
As a further improvement of the utility model, the control module comprises an MCU, and the model of the MCU is STM32F030C 6.
As a further improvement of the utility model, the chip model of the spectrum sensor is BH1745NUC, AS7261, AS7341, LSF0102-Q1 or TCS 3400.
In the RGB mixed white light source of above-mentioned controllable colour temperature, the light signal of red light source, blue light source, green light source is gathered to the spectrum collection optic fibre, transmits the relative spectral value of every kind of light source to spectrum sensor in real time, and spectrum sensor converts all relative spectral values received into tristimulus values, calculates the colour coordinate and the colour temperature that obtains mixed white light, control module calculates the relative spectral value of every kind of monochromatic light source that reaches this colour temperature according to the colour temperature that the user input, simultaneously through controlling first drive module, second drive module, third drive module, changes the power of every kind of monochromatic light source in order to reach corresponding relative spectral value, realizes the control to the colour temperature change. If the relative spectral value of one or more monochromatic light sources is higher than the relative spectral value calculated under the input color temperature, the control module outputs a signal for reducing the power of the monochromatic light source to the driving module of the monochromatic light source so as to achieve the relative spectral value; if the relative spectral value of one or more monochromatic light sources is lower than the calculated relative spectral value at the input color temperature, the control module outputs a signal for improving the power of the monochromatic light source to the driving module of the monochromatic light source so as to achieve the relative spectral value.
According to the technical scheme, a spectrum sensing system is introduced while three monochromatic light sources of a red light source, a blue light source and a green light source are mixed to form white light, a feedback closed loop is realized, the color coordinate and the color temperature of the mixed white light are calculated and obtained through the spectrum values of the three monochromatic light sources which are fed back, and high-precision and self-stable color temperature control is realized through comparison with a target. And the relative spectral value of each monochromatic light source can be monitored in real time, so that the color temperature is kept stable when the RGB mixed white light source continuously outputs.
Compared with the prior art, the utility model has the beneficial effects that:
by adopting the technical scheme of the utility model, the spectrum sensor is added to collect the spectrum of a single light source, so that a hardware basis is provided for adjusting and changing according to the requirements of users, high-precision color temperature control and automatic stabilization of color temperature are realized, the optimal lighting effect is realized under different environmental conditions, the light source does not need to be switched when the LED light source is used in different environments, and the phenomenon that the color temperature set by mixed white light is changed and the lighting effect is influenced due to inconsistent attenuation speeds of RGB tricolor light is avoided; the light path is simple and easy to implement.
Drawings
Fig. 1 is a schematic structural diagram of an RGB white light source with controllable color temperature according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of an RGB white light source with controllable color temperature according to an embodiment of the present invention.
Fig. 3 is a circuit diagram of a control chip according to an embodiment of the present invention.
FIG. 4 is a circuit diagram of a spectral sensor according to an embodiment of the present invention.
Fig. 5 is a circuit diagram of an RGB white light source module according to an embodiment of the utility model.
The reference numerals include:
1-RGB mixed white light source module, 2-spectrum sensing system, 3-drive control panel;
11-blue light source, 12-green light source, 13-red light source, 14-first dichroic mirror, 15-second dichroic mirror and 16-light outlet;
21-branch collecting optical fiber, 22-optical fiber fixer, 23-diffusion sheet and 24-spectrum sensor.
Detailed Description
Preferred embodiments of the present invention are described in further detail below.
As shown in fig. 1 and fig. 2, an RGB mixed white light source with controllable color temperature includes an RGB mixed white light source module 1, a spectrum sensing system 2 and a driving control board 3.
The RGB mixed white light source module 1 comprises a red light source 13, a blue light source 11, a green light source 12, three monochromatic light sources, a first dichroic mirror 14 for transmitting blue and reflecting red and green, a second dichroic mirror 15 for transmitting red and reflecting blue and green, and a light outlet 16, wherein the first dichroic mirror 14 and the second dichroic mirror 15 are sequentially positioned in the emergent direction of the red light source 13 and form an included angle with the collimated light of the red light source 13, the blue light source 11 and the green light source 12 are positioned on one side of the red light source 13, the green light source 12 faces the second dichroic mirror 15, the blue light source 11 faces the first dichroic mirror 14, and the light outlet 16 is positioned in the emergent direction of the collimated light of the blue light source 11. The red light source 13 reaches the light outlet 16 through the second dichroic mirror 15 and the first dichroic mirror 14 in sequence, the green light source 12 sequentially passes through the second dichroic mirror 15 and the first dichroic mirror 14 to reach the light outlet 16, and the blue light source 11 sequentially passes through the second dichroic mirror 15 and the first dichroic mirror 14 to reach the light outlet 16, and the light is mixed and output. In this embodiment, the first dichroic mirror 14 forms an included angle of 45 degrees with the collimated light emitted by the red light source 13, the blue light source 11, and the green light source 12; the second dichroic mirror 15 forms an included angle of 45 degrees with the collimated light emitted by the red light source 13, the blue light source 11 and the green light source 12. Wherein, the first dichroic mirror 14 has good light transmittance for most of the blue light spectrum wavelength, and almost totally reflects light outside the blue light spectrum wavelength; the second dichroic mirror 15 has good light transmittance for most of the red light spectral wavelengths, and almost totally reflects light outside the red light spectral wavelengths.
The driving control board 3 is provided with a first driving module, a second driving module, a third driving module and a control module, and the spectrum sensor 24 is located on the driving control board 3. The red light source 13 is electrically connected with the first driving module, the blue light source 11 is electrically connected with the second driving module, the green light source 12 is electrically connected with the third driving module, and the first driving module, the second driving module and the third driving module are electrically connected with the control module. The spectrum sensing system 2 comprises a spectrum collecting optical fiber and a spectrum sensor 24, the spectrum collecting optical fiber comprises branch collecting optical fibers 21 corresponding to each monochromatic light source, one end of each branch collecting optical fiber 21 is respectively located at an emergent port of the red light source 13, the blue light source 11 and the green light source 12, all the branch collecting optical fibers 21 are finally mixed and transmitted to the spectrum sensor 24, and the spectrum sensor 24 is electrically connected with the control module. The spectrum sensor 24 is provided with a diffusion sheet 23, and the spectrum collection optical fiber transmits the optical signal to the spectrum sensor 24 through the diffusion sheet 23. The spectrum collection optical fiber is connected with the driving control board 3 through an optical fiber fixer 22.
Further, the control module comprises a control chip, the model of the control chip is STM32F030C6, and a circuit diagram of the control chip is shown in fig. 3. The circuit diagram of the spectrum sensor of the present embodiment is shown in fig. 4. Fig. 5 shows a circuit diagram of the RGB white-light mixed light source module of the present embodiment.
By adopting the technical scheme of the embodiment, the light of the blue light source 11 can directly penetrate through the first dichroic mirror 14 and irradiate to the light outlet 16; the light of the green light source 12 is reflected by the second dichroic mirror 15, then reflected by the first dichroic mirror 14, and emitted to the light outlet 16; the light from the red light source 13 directly passes through the second dichroic mirror 15, is reflected by the first dichroic mirror 14, and then is emitted to the light outlet 16. Between the first dichroic mirror 14 and the light exit 16, the RGB monochromatic light sources, i.e. the blue light source 11, the green light source 12, the red light source 13, have been mixed into white light.
Each branch acquisition optical fiber 21 is close to the monochromatic light source to acquire the spectral data of the monochromatic light source in real time, and all the branch acquisition optical fibers 21 are finally mixed and transmitted to the spectral sensor 24. A diffusion sheet 23 is added to the spectrum sensor 24 so that the spectrum sensor 24 obtains uniform mixed spectrum data. The driving module on the driving control board 3 is used to drive each monochromatic light source, and the control module controls the output of the driving module of each monochromatic light source.
In this embodiment, the spectrum collection optical fiber transmits the relative spectral values of each light source to the spectrum sensor, and the spectrum sensor converts all the received relative spectral values into tristimulus values; after the tristimulus values are obtained, the color coordinates and the color temperature of the mixed white light are calculated, then the relative spectrum value of each monochromatic light source reaching the color temperature is calculated according to the color temperature input by a user, and meanwhile, the control module changes the power of each monochromatic light source to reach the corresponding relative spectrum value by controlling the first driving module, the second driving module and the third driving module, so that the accurate control of the color temperature change is realized.
The foregoing is a more detailed description of the utility model in connection with specific preferred embodiments and it is not intended that the utility model be limited to these specific details. For those skilled in the art to which the utility model pertains, several simple deductions or substitutions can be made without departing from the spirit of the utility model, and all shall be considered as belonging to the protection scope of the utility model.
Claims (6)
1. A RGB mixed white light source with controllable color temperature is characterized in that: the light source module comprises a red light source, a blue light source, a green light source, a first dichroic mirror for transmitting blue and reflecting red and green, a second dichroic mirror for transmitting red and reflecting blue and green and a light outlet, wherein the red light source sequentially passes through the second dichroic mirror and the first dichroic mirror to reach the light outlet, the green light source sequentially passes through the second dichroic mirror and the first dichroic mirror to reach the light outlet, and the blue light source sequentially passes through the second dichroic mirror and the first dichroic mirror to reach the light outlet, and is mixed with the light and then output;
the red light source is electrically connected with the first driving module, the blue light source is electrically connected with the second driving module, the green light source is electrically connected with the third driving module, and the first driving module, the second driving module and the third driving module are electrically connected with the control module;
one end of the spectrum acquisition optical fiber is respectively positioned at the red light source, the blue light source and the green light source exit port, the other end of the spectrum acquisition optical fiber transmits signals to the spectrum sensor, and the spectrum sensor is electrically connected with the control module.
2. The color temperature controllable RGB white light mixing light source according to claim 1, wherein: the first dichroic mirror and the second dichroic mirror are sequentially located in the emitting direction of the red light source and form an included angle with collimated light of the red light source, the blue light source and the green light source are located on one side of the red light source, the green light source faces the second dichroic mirror, the blue light source faces the first dichroic mirror, and the light outlet is located in the emitting direction of the collimated light of the blue light source.
3. The color temperature controllable RGB white light mixing light source according to claim 2, wherein: the first dichroic mirror forms an included angle of 45 degrees with collimated light rays emitted by the red light source, the blue light source and the green light source; and the second dichroic mirror forms an included angle of 45 degrees with collimated light rays emitted by the red light source, the blue light source and the green light source.
4. The RGB mixed white light source of controllable color temperature according to any one of claims 1-3, wherein: the device comprises a drive control board, wherein the first drive module, the second drive module, the third drive module, the control module and the spectrum sensor are positioned on the drive control board.
5. The RGB white light source of claim 4, wherein: the spectrum sensor is provided with a diffusion sheet, and the spectrum collection optical fiber transmits the optical signal to the spectrum sensor through the diffusion sheet.
6. The RGB white light source of claim 5, wherein: the spectrum acquisition optical fiber is connected with the driving control board through the optical fiber fixer.
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| CN113885192A (en) * | 2021-09-23 | 2022-01-04 | 深圳百炼光特种照明有限公司 | Self-stabilization color temperature-controllable RGB mixed white light source and control method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113885192A (en) * | 2021-09-23 | 2022-01-04 | 深圳百炼光特种照明有限公司 | Self-stabilization color temperature-controllable RGB mixed white light source and control method thereof |
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