CN114397793A - Hybrid light source device and projection system - Google Patents
Hybrid light source device and projection system Download PDFInfo
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- CN114397793A CN114397793A CN202111646605.4A CN202111646605A CN114397793A CN 114397793 A CN114397793 A CN 114397793A CN 202111646605 A CN202111646605 A CN 202111646605A CN 114397793 A CN114397793 A CN 114397793A
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- 238000004020 luminiscence type Methods 0.000 abstract description 22
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- 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
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2006—Lamp housings characterised by the light source
- G03B21/2013—Plural light sources
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- 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
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2006—Lamp housings characterised by the light source
- G03B21/2033—LED or laser light sources
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- 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
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2053—Intensity control of illuminating light
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- 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
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/206—Control of light source other than position or intensity
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Abstract
The invention provides a mixed light source device and a projection system, wherein the mixed light source device comprises a first light source component, a second light source component and an optical-mechanical system; wherein the first light source assembly comprises a first convergent lens; the stimulated luminescence is converged by the first converging lens and then enters the optical-mechanical system; the second light source assembly comprises a second light source, a second light splitting element and a second converging lens; the second light source comprises a light emitting diode for generating second primary light; and the second primary color light is converged by the second converging lens and then enters the second light splitting element. Before the stimulated luminescence and the second primary color light are combined, the first converging lens and the second converging lens converge the stimulated luminescence and the second primary color light respectively, so that the light distribution angles of the stimulated luminescence and the second primary color light entering the optical-mechanical system can be independently set, and the mixed light source device can give consideration to both brightness and contrast.
Description
Technical Field
The invention relates to the technical field of optical equipment, in particular to a hybrid light source device and a projection system.
Background
In the conventional hybrid light source device, as shown in fig. 1, the conventional hybrid light source device generally mainly includes a first light source assembly 1, a second light source assembly 2, and an optical-mechanical system 3; wherein the first light source assembly 1 comprises a first light source 11, a first light splitting element 12, a wavelength conversion device 13 and a first converging lens 14 which are arranged in a light path; the first light source 11 is a laser light source, and emits excitation light 101; the first light splitting element 12 is used for guiding the excitation light 101 emitted by the first light source 11 to the wavelength conversion device 13, and the wavelength conversion device 13 performs wavelength conversion on the excitation light 101 to generate stimulated light 102; the excited light 102 is further guided to the first converging lens 14 by the first light splitting element 12 to be converged and then enters the opto-mechanical system 3; the second light source assembly 2 includes a second light source 21, the second light source 21 is used for emitting a second primary light 103, the kind of the second primary light 103 depends on the requirement of the hybrid light source device, for example, the second light source 21 may be a red LED light source, and the second primary light 103 may be a red light; the second primary color light 103 emitted by the second light source 21 is subjected to light shaping by a shaping lens (not shown), enters the first light splitting element 12, is guided by the first light splitting element 12, passes through the first converging lens 14, and enters the opto-mechanical system 3.
The second light source 21 is an LED light source, and has a certain light emitting size and is distributed in a lambertian manner, the stimulated light 102 generated by the first light source assembly 1 is generated by excitation of an excitation light spot, the light emitting size design thereof can be flexibly adjusted and is also distributed in a lambertian manner, and the stimulated light 102 and the second primary light 103 share a converging lens before entering the opto-mechanical system 3, so that the light distribution angles of the stimulated light 102 and the second primary light 103 entering the opto-mechanical system 3 are the same. The contrast of the DLP optical-mechanical system is related to the light distribution angle of incidence to the optical-mechanical system, and the larger the distribution angle is, the worse the contrast of the optical-mechanical system is. Since the luminous flux of the LED light source is proportional to the size of the light emitting area, in order to obtain high luminous flux, the utilization rate of the LED is generally increased by increasing the light distribution angle of the LED light source incident to the optical mechanical system, because the common converging lens is used, the light distribution angle of the excited light 102 incident to the optical mechanical system 3 is also increased, and finally the contrast of the system is deteriorated, which is only about 500. Sometimes, in order to improve the contrast of the optical-mechanical system 3, the light distribution angle can only be reduced by sacrificing the luminous flux of the LED light source incident to the optical-mechanical system 3, that is, for the optical-mechanical system using the LED light source, the brightness and the contrast of the optical-mechanical system are in a seesaw effect, so that the conventional hybrid light source device cannot simultaneously meet the requirements of high brightness and high contrast.
Disclosure of Invention
The invention solves the problem that the existing mixed light source device can not meet the requirements of high brightness and high contrast simultaneously.
In order to solve the above problems, the present invention provides a hybrid light source device, which includes a first light source assembly, a second light source assembly and an optical-mechanical system; wherein,
the first light source assembly comprises a first light source, a wavelength conversion device and a first convergent lens;
the first light source comprises a laser diode for generating excitation light of blue or violet;
the wavelength conversion device is used for performing wavelength conversion on the exciting light to generate stimulated light;
the stimulated luminescence is converged by the first converging lens and then enters the optical-mechanical system;
the second light source assembly comprises a second light source, a second light splitting element and a second converging lens;
the second light source comprises a light emitting diode for generating second primary light;
the second light splitting element is arranged on a light path between the first convergent lens and the optical mechanical system;
the second converging lens is arranged on an optical path between the second light source and the second light splitting element;
the second primary color light generated by the second light source is converged by the second converging lens and then enters the second light splitting element;
the second light splitting element guides the excited light and the second primary color light to the optical mechanical system.
Optionally, the spatial light distribution of the stimulated light after being converged by the first converging lens is a first light distribution, and the distribution angle thereof is a first light distribution angle; the spatial light distribution of the second primary color light converged by the second converging lens is a second light distribution, and the distribution angle of the second primary color light is a second light distribution angle;
the second light distribution angle is less than the first light distribution angle.
Optionally, the first condensing lens and the second condensing lens are both single lenses, and the optical path length from the first condensing lens to the optical mechanical system is longer than the optical path length from the second condensing lens to the optical mechanical system.
Optionally, the first condensing lens and the second condensing lens are both lens groups, and the optical path length from the first condensing lens to the optical mechanical system is greater than the optical path length from the second condensing lens to the optical mechanical system.
Optionally, the second primary light is red light.
Optionally, the second light splitting element is a flat glass plated with a selective transmission film; the second light splitting element transmits the excited light and reflects the second primary light; or, the second light splitting element reflects the excited light and transmits the second primary color light.
Optionally, the second light splitting element is a rotating color wheel, and the rotating color wheel includes a transmissive region and a reflective region.
Optionally, the reflection region is used for reflecting the second primary color light; or, the reflecting region is used for reflecting the excited light.
Optionally, the second light source assembly further comprises a second collimating lens; the second collimating lens is disposed on a light path between the second light source and the second converging lens.
It is another object of the present invention to provide a projection system comprising the hybrid light source device as described above.
Compared with the prior art, the mixed light source device provided by the invention has the following advantages:
before the stimulated luminescence and the second primary color light are combined, the first converging lens and the second converging lens converge the stimulated luminescence and the second primary color light respectively, so that the light distribution angles of the stimulated luminescence and the second primary color light entering the optical-mechanical system can be independently set, and the mixed light source device can give consideration to both brightness and contrast.
Drawings
FIG. 1 is a schematic diagram of a conventional hybrid light source device;
FIG. 2 is a schematic diagram of a hybrid light source device according to the present invention;
FIG. 3 is a schematic diagram of the focal length versus convergence angle of a lens;
FIG. 4 is a schematic diagram of a hybrid light source device according to the present invention;
FIG. 5 is a schematic diagram of the structure of the excitation light path and the stimulated light path in the present invention;
FIG. 6 is a schematic diagram of the optical path of the second primary light in the present invention;
FIG. 7 is a schematic view of a hybrid light source device according to the present invention;
FIG. 8 is a graph comparing the spectrum of the stimulated luminescence with the spectrum of the second primary color in accordance with the present invention;
FIG. 9 is a schematic view of a hybrid light source device according to the present invention;
fig. 10 is a schematic structural diagram of a rotating color wheel according to the present invention;
FIG. 11 is a schematic view of a hybrid light source device according to the present invention;
FIG. 12 is a schematic view showing a sixth configuration of the hybrid light source device according to the present invention;
fig. 13 is a schematic view showing a configuration of a hybrid light source device according to the present invention.
Description of reference numerals:
1-a first light source assembly; 11-a first light source; 12-a first light splitting element; 13-a wavelength conversion device; 14-a first converging lens; 15-a first collimating lens; 2-a second light source assembly; 21-a second light source; 22-a second light splitting element; 221-a transmission region; 222-a reflective region; 23-a second converging lens; 23' -a mirror image of the second converging lens; 24-a second collimating lens; 3-an optical-mechanical system; 101-excitation light; 102-stimulated luminescence; 103-light of a second primary color.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and intended to be illustrative of the present invention and should not be construed as limiting the present invention, and all other embodiments that can be obtained by one skilled in the art based on the embodiments of the present invention without inventive efforts shall fall within the scope of protection of the present invention.
In the description of the present invention, it is to be understood that the terms "first" and "second" are used merely for simplifying the description, and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the first feature being "on" or "under" the first feature may comprise the first feature being in direct contact with the second feature or the first feature being in direct contact with the second feature but being in contact with the second feature by another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. The first feature being "under," "below," and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or merely indicates that the first feature is at a lower level than the second feature.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
In order to solve the problem that the conventional hybrid light source device cannot meet the requirements of high brightness and high contrast at the same time, the invention provides a hybrid light source device, which is shown in fig. 2 and comprises a first light source component 1, a second light source component 2 and an optical-mechanical system 3; the first light source assembly 1 is configured to generate stimulated light 102, and specifically, the first light source assembly 1 includes a first light source 11, a wavelength conversion device 13, and a first focusing lens 14; the first light source 11 includes a laser diode for generating excitation light 101 of blue or violet; the excitation light 101 is guided to the wavelength conversion device 13, and the wavelength conversion device 13 is used for performing wavelength conversion on the excitation light 101 to generate stimulated light 102; the excited light 102 is converged by the first converging lens 14 and then enters the opto-mechanical system 3; the spatial light distribution of the stimulated light 102 after being converged by the first converging lens 14 is referred to as a first light distribution, and the distribution angle thereof is referred to as a first light distribution angle.
The second light source assembly 2 includes a second light source 21, a second light splitting element 22, and a second condensing lens 23; the second light source 21 comprises light emitting diodes for generating a second primary light 103; the second beam splitting element 22 is disposed on the optical path between the first focusing lens 14 and the opto-mechanical system 3; the second converging lens 23 is disposed on the optical path between the second light source 21 and the second light splitting element 22; the second primary color light 103 generated by the second light source 21 is converged by the second converging lens 23 and then enters the second light splitting element 22; the second light splitting element 22 guides the excited light 102 and the second primary color light 103 to the opto-mechanical system 3; the spatial light distribution of the second primary color light 103 converged by the second converging lens 23 is denoted as a second light distribution, and the distribution angle thereof is denoted as a second light distribution angle; the present application prefers that the second light distribution angle is smaller than the first light distribution angle.
In the working process of the hybrid light source, the stimulated luminescence 102 generated in the first light source assembly 1 firstly enters the first focusing lens 14, is focused by the first focusing lens 14, then enters the second light splitting element 22, and then is guided to the optical mechanical system 3 by the second light splitting element 22 after being focused by the first focusing lens 14; in the second light source assembly 2, the second primary color light 103 emitted by the second light source 2 firstly enters the second converging lens 23, is converged by the second converging lens 23, then enters the second light splitting element 22, and then is guided to the optical mechanical system 3 by the second light splitting element 22 after being converged by the second converging lens 23.
Before the stimulated luminescence 102 and the second primary color light 103 are combined, the stimulated luminescence 102 and the second primary color light 103 are converged by the first converging lens 14 and the second converging lens 23 respectively, so that the light distribution angles of the stimulated luminescence 102 and the second primary color light 103 entering the optical-mechanical system 3 can be independently set, and the mixed light source device can give consideration to both brightness and contrast; further, the second light distribution angle is smaller than the first light distribution angle, so that the light distribution angle of the stimulated light 102 incident to the optical mechanical system 3 is reduced, the distribution angle of the second primary light 103 incident to the optical mechanical system 3 is improved to the maximum extent to increase the utilization rate of the second primary light 103, and high brightness and high contrast are achieved at the same time.
The first light source assembly 1 in the present application may be any existing light source structure capable of converting excitation light generated by a laser light source into stimulated light 102; as shown in fig. 13, the first light source module 11 may include a first light source 11, a wavelength conversion device 13, and a first focusing lens 14 sequentially disposed in an optical path, and a first collimating lens 15 may be further included between the first focusing lens 14 and the wavelength conversion device 13; wherein the wavelength conversion device 13 is provided with a wavelength conversion region and a transmission region, and the wavelength conversion region is a transmission-type wavelength conversion region; when the excitation light 101 emitted by the first light source 11 enters the transmission region on the wavelength conversion device 13, the excitation light directly transmits through the wavelength conversion device 13, passes through the first collimating lens 15 and the first converging lens 14 again, enters the second light splitting element 22, and is guided to the opto-mechanical system 3 by the second light splitting element 22; when the excitation light 101 emitted by the first light source 11 is incident on the transmissive wavelength conversion region on the wavelength conversion device 13, the wavelength conversion material is excited, generating excited light 102; the excited light 102 sequentially passes through the wavelength conversion device 13, the first collimating lens 15, and the first converging lens 14, then enters the second beam splitter 22, and is guided to the opto-mechanical system 3 by the second beam splitter 22.
As shown in fig. 2, the first light source module 1 may further include a first light splitting element 12 for guiding the excitation light 101 and the excited light 102; specifically, the first light source assembly 1 includes a first light source 11, a first light splitting element 12, and a wavelength conversion device 13; the first light source 1 emits excitation light 101; the first spectroscopic element 12 guides the excitation light 101 to the wavelength conversion device 13, generating excited light 102; the stimulated light 102 is guided to the first condensing lens 14 by the first light splitting element 12; a first collimating lens 15 may be disposed between the wavelength conversion device 13 and the first light splitting element 12, and a light shaping structure may be disposed between the first light source 11 and the first light splitting element 12. It should be noted that, the first light source module 1 may further include a light path for guiding the excitation light 101 to the optical-mechanical system 3; since the present application focuses on optimizing the optical paths of the combined excited light 102 and the second primary color light 103, the optical path for guiding the excited light 101 to the opto-mechanical system 3 is not specifically limited, and the optical path can be realized by conventional elements such as a mirror group; moreover, in order to combine the excitation light 101, the second light splitting element 22 may implement reflection or transmission of the excitation light 101 according to the requirement of the light path, so as to guide the excitation light 101 into the optical-mechanical system 3; when the second light splitting element 22 is a flat glass, reflection or transmission of the excitation light 101 can be achieved by coating; when the second light splitting element 22 is a rotating color wheel, reflection or transmission of the excitation light 101 may be achieved by providing a color filter.
Wherein the first light splitting element 12 can be a flat glass plated with a selective transmission film; the first light splitting element 12 can be used for reflecting the excitation light 101 and transmitting the excited light 102; the device can also be used for transmitting the excitation light 101 and reflecting the excited light 102; for convenience of understanding, the first light splitting element 12 reflects the excitation light 101 and transmits the stimulated light 102 in the present application.
In the present application, both the first focusing lens 14 and the second focusing lens 23 can be a single lens, and the optical path length from the first focusing lens 14 to the optical-mechanical system 3 is longer than the optical path length from the second focusing lens 23 to the optical-mechanical system 3, that is, the focal length of the first focusing lens 14 is longer than the focal length of the second focusing lens 23.
In this application, the first focusing lens 14 and the second focusing lens 23 may be both lens groups, and the optical path length from the first focusing lens 14 to the optical mechanical system 3 is longer than the optical path length from the second focusing lens 23 to the optical mechanical system 3, that is, the focal length of the first focusing lens 14 is longer than the focal length of the second focusing lens 23.
Specifically, the focal length of the first focusing lens 14 depends on the light distribution angle of the stimulated light 102 incident on the opto-mechanical system 3, and the focal length of the second focusing lens 23 depends on the utilization rate of the luminous flux of the second primary light 103; specifically, referring to fig. 3, D is the effective diameter of the lens, and θ 1 and θ 2 are the convergence angles of the lens; it can be seen that, under the same effective diameter of the lens, the lens with small focal length has larger convergence angle; according to the geometrical optics knowledge, under the condition that the aperture of the optical-mechanical system 3 is constant, the utilization rate of the light source is inversely proportional to the F number of the converging lens, the F of the converging lens is equal to the focal length of the converging lens divided by the effective diameter of the converging lens, namely 1/(2 × tan θ 1), and the utilization rate of the light source is understood to be proportional to the converging angle of the converging lens, and the larger the converging angle of the lens is, the higher the utilization rate of the light source is. For the present application, both the excited light 102 and the second primary color light 103 need to be incident into the optical-mechanical system 3, that is, both need to converge into the aperture of the optical-mechanical system with the same size, so that a converging lens with a short focal length is adopted, which can obtain a larger light source utilization rate, that is, reduce the focal length of the second converging lens 23, and is helpful to improve the luminous flux utilization rate of the second light source 21 and improve the brightness.
Compared with an LED light source with a certain size, the size of the stimulated luminescence spot is reduced due to the adjustable size of the stimulated luminescence spot, and under the condition that the same aperture efficiency of the stimulated luminescence 102 entering the optical mechanical system 3 is met, the focal length of the convergent lens can be increased, the light distribution angle of the entering optical mechanical system 3 is reduced, and the effect of increasing the system contrast is achieved.
The focal length of the second converging lens 23 is preferably smaller than that of the first converging lens 14, so that the light distribution angle of the second primary color light 103 of the hybrid light source device is larger than that of the stimulated light 102, and the utilization rate of the luminous flux of the second primary color light 103 and the requirement of high contrast of the stimulated light 102 can be considered.
Referring to fig. 4, the second converging lens 23 in fig. 2 is mirrored with respect to the second beam splitting element 22 to obtain a mirror image 23 'of the second converging lens, and since the focal length of the second converging lens 23 is smaller than that of the first converging lens 14, the distance from the mirror image 23' of the second converging lens to the inlet channel of the optical mechanical system 4 is smaller than that from the first converging lens 14 to the inlet channel of the optical mechanical system 4.
For convenience of understanding, the exciting light path, the stimulated light path and the second primary light path are respectively displayed in the application; the light path diagram of the exciting light and the stimulated light is shown in FIG. 5, and the light path diagram of the second primary color light is shown in FIG. 6; the application provides a hybrid light source device, through the different first convergent lens 14 of focus and second convergent lens 23 respectively to receive exciting light 102 and the convergence of second primary color light 103, rethread second beam split component 22 closes the light after, gets into ray apparatus system 3 to when satisfying the big luminous flux utilization ratio demand of second primary color light 103, exert the advantage of receiving the higher contrast of exciting light 102.
The kind of the second primary light 103 may be determined according to the requirement of the hybrid light source device; the second light source 21 may be a red LED light source or a red laser light source, so that the generated second primary color light 103 is red light.
The second light splitting element 22 in this application may be a flat glass coated with a selective transmission film, so as to guide the excited light 102 and the second primary color light 103 through the coating film.
One way of implementing the second light splitting element 22 coated with a selective transmission film is that the second light splitting element 22 transmits the excited light 102 and reflects the second primary light 103.
Referring to fig. 2, in this implementation, the optical-mechanical system 3 and the first light source assembly 1 are respectively disposed at two sides of the second light splitting element 22, and the excited light 102 is converged by the first converging lens 14, then passes through the second light splitting element 22 through a transmission effect, and enters the optical-mechanical system 3; the second primary color light 103 emitted by the second light source 21 is converged by the second converging lens 23, and then enters the second light splitting element 22, and after being reflected and combined with the excited light 102, enters the optical-mechanical system 3.
Another implementation manner of the second light splitting element 22 being coated with a selective transmission film is that the second light splitting element 22 reflects the excited light 102 and transmits the second primary color light 103.
Referring to fig. 7, in this implementation, the optical mechanical system 3 and the second light source 21 are respectively disposed at two sides of the second light splitting element 22, and the excited light 102 is converged by the first converging lens 14, then enters the second light splitting element 22, and is guided to the optical mechanical system 3 by the second light splitting element 22 through reflection; the second primary color light 103 emitted by the second light source 21 is converged by the second converging lens 23, enters the second light splitting element 22, passes through the second light splitting element 22 under the transmission effect, is combined with the excited light 102, and enters the optical-mechanical system 3.
Since the spectrum of the second primary color light 103 partially overlaps with the spectrum of the stimulated light 102, when the second dichroic element 22 is coated with a selective transmission film to guide the second primary color light 103 and the stimulated light 102, the overlapped portion of the spectra cannot be used, resulting in loss of light flux; for example, when the second primary color light 103 is red light, as shown in fig. 8, since the spectrum of the excited light 102 coincides with that of the red light in the long wavelength band, the second light splitting element 22 cannot transmit the long wavelength band part of the excited light 102 while reflecting the red light, so that the part of the excited light cannot be used; likewise, when the second light splitting element 22 achieves transmission of red light, the long-wavelength band portion of the excited light 102 cannot be reflected, so that the portion of the excited light cannot be used.
In order to improve the utilization rate of the light source, the second light splitting element 22 is preferably a rotating color wheel, as shown in fig. 9 and 10, the rotating color wheel is provided with a transmission region 221 and a reflection region 222; the transmissive region 221 and the reflective region 222 on the rotating color wheel may be implemented by disposing color filters, so that different light splitting effects on the excited light 102 and the second primary color light 103 are implemented by the rotation of the rotating color wheel.
In particular, one implementation of the rotating color wheel is that, referring to fig. 9, the reflective region 222 is used for reflecting the second primary color light 103; the transmissive region 221 may transmit light of all wavelengths, or may transmit only the excitation light 101 and the stimulated light 102; an exciting light transmission area and an excited light transmission area can be arranged on the rotating color wheel; the specific arrangement and the area of each region can be determined according to the requirements of the light source device.
In this implementation, the optical-mechanical system 3 and the first light source assembly 1 are respectively disposed at two sides of the second light splitting element 22, and the excited light 102 is converged by the first converging lens 14 and then incident to the rotating color wheel; when the excited light 102 is incident on the transmission region 221 of the rotating color wheel, it passes through the second light splitting element 22 by transmission and is incident on the optical-mechanical system 3; the second primary color light 103 emitted by the second light source 21 is converged by the second converging lens 23 and then enters the rotating color wheel; when the second primary color light 103 is incident to the reflection region 222 on the rotating color wheel, it is reflected and combined with the excited light 102, and then is incident to the optical-mechanical system 3.
Another way of implementing the rotating color wheel is that, referring to fig. 11, the reflective region 222 is used to reflect the excited light 102; the transmissive region 221 may transmit light of all wavelengths, or may transmit only the excitation light 101 and the second primary color light 103; an exciting light transmission area and a second primary color light transmission area can be arranged on the rotating color wheel; the specific arrangement and the area of each region can be determined according to the requirements of the light source device.
In this implementation, the optical-mechanical system 3 and the second light source 21 are respectively disposed at two sides of the second light splitting element 22, and the excited light 102 is converged by the first converging lens 14 and then incident to the rotating color wheel; when the excited light 102 is incident to the reflection region 222 of the rotating color wheel, the excited light is reflected and guided to the optical-mechanical system 3 by the rotating color wheel; the second primary color light 103 emitted by the second light source 21 is converged by the second converging lens 23 and then enters the rotating color wheel; when the light 103 is incident on the transmission region 221 of the rotating color wheel, it passes through the rotating color wheel through the transmission effect, and is incident on the optical-mechanical system 3 after being combined with the excited light 102.
Further, in order to achieve the optimal effect, the outermost side of the rotating color wheel is preferably located in the light splitting path, and the outermost side of the rotating color wheel is closest to the focusing position of the light beam or the light channel entrance position of the optical-mechanical system 3.
Further, referring to fig. 12, the second light source module 2 further includes a second collimating lens 24; the second collimating lens 24 is disposed on the light path between the second light source 21 and the second converging lens 23, so that the second primary color light 103 emitted by the second light source 21 is collimated by the second collimating lens 24 and then enters the second converging lens 23 to be converged.
According to the mixed light source device provided by the invention, the excited light 102 and the second primary color light 103 are converged and then combined through the two converging lenses with different focal lengths, and the converging positions of the two converging lenses are the same, so that the light distribution angles of the two light sources are not influenced mutually; meanwhile, the contrast of the projection system is improved, and particularly, after two independent converging lenses with different focal lengths are adopted, the contrast of the system is improved compared with that of the system adopting one shared converging lens; the contrast ratio here refers to the contrast ratio of the whole projection system after the light source is combined with the optical-mechanical system, i.e. the ratio of the system full white picture to the full dark picture. Here, by way of example: the contrast assumption in the prior art is 1000, i.e., the full dark picture is 1/1000 for a full white picture; after adopting the scheme that this application provided, stimulated luminescence 102 utilizes small angle incident to ray apparatus system 3, and the full dark picture can reach 1/2000 of full bright picture, and stimulated luminescence 102 calculates with the green glow, and the energy of green glow and exciting light blue light occupies 85% of whole white light energy approximately, and second primary color light 103 is ruddiness, and the energy of ruddiness occupies 15% of whole white light energy approximately, and then the contrast of this application is: 1/(85%/2000 + 15%/1000) ═ 1739, which is more than 1.7 times the contrast of the prior art.
In addition, the second light splitting element 22 adopts the rotating color wheel, so that the problem of spectral overlapping of the excited light 102 and the second primary light 103 in the mixed light source is solved, and the utilization rate of the light source is improved.
It is another object of the present invention to provide a projection system comprising a hybrid light source device as described above.
In the projection system provided by the invention, before the stimulated luminescence 102 and the second primary color light 103 are combined in the mixed light source device, the stimulated luminescence 102 and the second primary color light 103 are respectively converged by the first converging lens 14 and the second converging lens 23, so that the light distribution angles of the stimulated luminescence 102 and the second primary color light 103 entering the optical-mechanical system 3 can be independently set, and the mixed light source device can give consideration to both brightness and contrast; further, the second light distribution angle is smaller than the first light distribution angle, so that the light distribution angle of the stimulated light 102 incident to the optical mechanical system 3 is reduced, the distribution angle of the second primary light 103 incident to the optical mechanical system 3 is improved to the maximum extent to increase the utilization rate of the second primary light 103, and high brightness and high contrast are achieved at the same time.
The present application may provide a high color mixing light source solution; because the mixed light source device can simultaneously meet the requirements of high brightness and high contrast, high-color projection display can be realized, and the high-color requirements of the fields of calligraphy training, drawing training and the like on a projection system are met.
Although the present disclosure has been described above, the scope of the present disclosure is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present disclosure, and such changes and modifications will fall within the scope of the present invention.
Claims (10)
1. A mixed light source device is characterized by comprising a first light source component (1), a second light source component (2) and an optical-mechanical system (3); wherein,
the first light source assembly (1) comprises a first light source (11), a wavelength conversion device (13) and a first convergent lens (14);
the first light source (11) comprises a laser diode for generating excitation light (101) of blue or violet color;
the wavelength conversion device (13) is used for performing wavelength conversion on the excitation light (101) to generate stimulated excitation light (102);
the stimulated light (102) is converged by the first converging lens (14) and then enters the optical-mechanical system (3);
the second light source assembly (2) comprises a second light source (21), a second light splitting element (22) and a second converging lens (23);
the second light source (21) comprises a light emitting diode for generating a second primary light (103);
the second light splitting element (22) is arranged on an optical path between the first convergent lens (14) and the optical machine system (3);
the second converging lens (23) is arranged on an optical path between the second light source (21) and the second light splitting element (22);
the second primary color light (103) generated by the second light source (21) is converged by the second converging lens (23) and then enters the second light splitting element (22);
the second light splitting element (22) guides the excited light (102) and the second primary color light (103) to the opto-mechanical system (3).
2. The hybrid light source device according to claim 1, wherein the spatial light distribution of the stimulated light (102) converged by the first converging lens (14) is a first light distribution having a first light distribution angle; the spatial light distribution of the second primary color light (103) converged by the second converging lens (23) is a second light distribution, and the distribution angle is a second light distribution angle; the second light distribution angle is less than the first light distribution angle.
3. The hybrid light source device according to claim 2, wherein the first focusing lens (14) and the second focusing lens (23) are both single lenses, and the optical path length from the first focusing lens (14) to the opto-mechanical system (3) is longer than the optical path length from the second focusing lens (23) to the opto-mechanical system (3).
4. The hybrid light source device according to claim 2, wherein the first focusing lens (14) and the second focusing lens (23) are both lens groups, and the optical path length from the first focusing lens (14) to the opto-mechanical system (3) is longer than the optical path length from the second focusing lens (23) to the opto-mechanical system (3).
5. The hybrid light source device according to claim 1, wherein the second primary light (103) is red light.
6. The hybrid light source device according to claim 1, wherein the second light splitting element (22) is a plate glass plated with a selectively transmissive film; the second light splitting element (22) transmits the excited light (102) and reflects the second primary light (103); or, the second light splitting element (22) reflects the excited light (102) and transmits the second primary color light (103).
7. The hybrid light source device according to claim 1, wherein the second light splitting element (22) is a rotating color wheel, and the rotating color wheel comprises a transmissive region (221) and a reflective region (222).
8. The hybrid light source device according to claim 7, wherein the reflection region (222) is configured to reflect the second primary light (103); or, the reflection region (222) is used for reflecting the excited light (102).
9. The hybrid light source device according to any one of claims 1 to 8, wherein the second light source module (2) further comprises a second collimating lens (24); the second collimating lens (24) is disposed on an optical path between the second light source (21) and the second condensing lens (23).
10. A projection system comprising the hybrid light source device according to any one of claims 1 to 9.
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| CN202111646605.4A CN114397793A (en) | 2021-12-30 | 2021-12-30 | Hybrid light source device and projection system |
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