CN106707669B - A kind of fluorescence excitation device, projection light source and projection device - Google Patents
A kind of fluorescence excitation device, projection light source and projection device Download PDFInfo
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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
- G03B21/204—LED or laser light sources using secondary light emission, e.g. luminescence or fluorescence
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/007—Optical devices or arrangements for the control of light using movable or deformable optical elements the movable or deformable optical element controlling the colour, i.e. a spectral characteristic, of the light
- G02B26/008—Optical devices or arrangements for the control of light using movable or deformable optical elements the movable or deformable optical element controlling the colour, i.e. a spectral characteristic, of the light in the form of devices for effecting sequential colour changes, e.g. colour wheels
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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
- G03B21/2066—Reflectors in illumination beam
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Abstract
The invention discloses a kind of fluorescence excitation devices.Fluorescence excitation device includes：Laser light source sends out excitation beam；Excitation beam is incident to fluorescent crystal through reflection condensation device and through photoconductive tube, and excitation fluorescent crystal shines；The fluorescence that fluorescent crystal is sent out reflexes to reflection condensation device through reflection component, and be collimated and reflex to deformation reflection mirror, deformation reflection mirror component controls driven, surface deforms, so that the transmission of angle diversification being reflected beam by, to make the hot spot distribution uniformity of light beam.The invention also discloses a kind of projection light source and projection devices.
Description
Technical Field
The invention relates to the field of light beam illumination, in particular to a fluorescence excitation device, a projection light source and projection equipment.
Background
There are two main ways of providing illumination from a light source in the industry today: as shown in the schematic diagram of fig. 1A, the architecture includes a 01 laser BANK, and parallel or approximately parallel laser emitted is reflected by a 02 light reflecting bowl and converged to the surface of a 03 fluorescent wheel to excite a fluorescent material. In this schematic diagram, the 03 fluorescent wheel is a transmissive fluorescent wheel, and the excited fluorescent light is emitted from the back of the 03 fluorescent wheel, and is converged by the 04 collimating lens group and then emitted. Fig. 1A shows that illumination is provided by collecting laser light through the light reflecting bowl and irradiating the rotary fluorescent wheel, and in this way, due to the surface type of the light reflecting bowl and the coating process, it is difficult to make the excitation light spot formed by focusing the light beam reflected by the light reflecting bowl on the rotary fluorescent wheel uniform, so that the fluorescent light generated by exciting the rotary fluorescent wheel is also unevenly distributed, and the uneven situation of the fluorescent light after being received also exists.
Another way to provide illumination from a light source is shown in fig. 1B, and the architecture includes: laser 101, beam reduction system 102, dichroic mirror 104, focusing collimating lens group 105, and fluorescent wheel 103.
The transmission path of the laser in the optical architecture shown in fig. 1B is as follows: laser light emitted from a laser 101 is emitted through a beam reduction system 102 and then reaches a dichroic mirror 104, the laser light beam is transmitted through the dichroic mirror 103 and then reaches a focusing and collimating lens group 105, the light beam emitted through the focusing and collimating lens group 105 is incident on a fluorescent wheel 103 to excite the fluorescent wheel to emit fluorescent light, the fluorescent wheel 103 in the example here can be a reflective fluorescent wheel, therefore, the fluorescent wheel 103 reflects the fluorescent light, the reflected fluorescent light is received through the focusing and collimating lens group 105 to be converged and collimated, a large-angle light beam distributed by a lambertian body (the radiation brightness in each direction of a radiation source is unchanged, and the radiation intensity follows the cosine law along with the change of an included angle theta between the observation direction and a normal line of a surface light source) is compressed into an approximately parallel light beam and emitted to the dichroic mirror 104, and the dichroic mirror 104 reflects the fluorescent light out. In this example, the process of collecting and collecting the fluorescence by the collimating lens group of the reflecting rear mirror is the same as the principle of collecting and collecting the fluorescence by the collimating lens group 04 after the fluorescence is transmitted in fig. 1A.
In this illumination mode, since the optical path structure is provided with a plurality of lenses, especially the collimating lens group 105 located on the front surface of the fluorescent wheel, on one hand, laser excitation light is converged again to form a light spot with a preset size to be irradiated onto the fluorescent wheel, and at the same time, fluorescence reflected by the fluorescent wheel is converged and collimated.
In the illumination mode shown in fig. 1A or fig. 1B, on one hand, the laser spot itself has a certain non-uniformity due to the difference between the converging speeds of the fast axis and the slow axis of the laser BANK itself, and when the mode shown in fig. 1B is used, especially when the laser is transmitted through the lens group consisting of the plurality of lenses, the non-uniformity of the laser spot is aggravated again due to the lens processing technology, the aberration accumulation of the plurality of lenses, and the lens is irradiated by the laser spot with high energy density, which itself generates a temperature gradient difference, so that the refractive index of the lens also changes. When the uneven laser spot is irradiated on the phosphor, the excited fluorescence inevitably has the uneven problem.
And, in the mode shown in fig. 1A and 1B, since the range of the divergence angle of the fluorescence is large, even if the lens for collecting the light is disposed closer to the rotary fluorescence wheel, the light beam of the large divergence angle cannot be collected by the lens inevitably, so that light loss is formed, resulting in low collection efficiency of the fluorescence.
In summary, the conventional fluorescence excitation illumination method has technical defects of non-uniformity of fluorescence excitation light spot and low light collection efficiency.
Disclosure of Invention
The invention provides a fluorescence excitation device, a projection light source and projection equipment, which can improve the uniformity of light beams and the light collection efficiency.
The fluorescence excitation device provided by the embodiment of the invention comprises:
the excitation light source emits an excitation light beam;
the reflecting type light gathering device is provided with a light through hole and a reflecting surface, the exciting light beam penetrates through the light through hole, and the reflecting surface of the reflecting type light gathering device collimates and reflects the light beam emitted from the light guide pipe;
a light guide for guiding the light beam transmitted by the reflection-type condensing device to the fluorescent crystal and guiding the light beam reflected by the reflection member to the reflection-type condensing device;
the fluorescent crystal is arranged in close contact with the light guide pipe and is excited by the light beam guided by the light guide pipe to generate fluorescence;
a reflecting member for reflecting fluorescence generated by the excitation of the fluorescent crystal to the light guide;
the deformable reflector is used for reflecting part of fluorescent light in the fluorescent light reflected by the reflection type light gathering device and transmitting the other part of fluorescent light, and the surface of the deformable reflector can be driven by the driving part to deform;
the light guide pipe comprises a first end face and a second end face, light beams of at least one color enter the light guide pipe from the first end face and exit from the second end face to the fluorescent crystal, and the area of the first end face is larger than that of the second end face;
further, the driving algorithm of the driving part of the deformable mirror is a random function algorithm.
Or, further, the fluorescence excitation device further comprises:
the detection device is used for detecting the light spot distribution of the fluorescence transmitted from the deformable reflector to form a feedback signal and providing the feedback signal to the driving part of the deformable reflector;
further, the deformed mirror transmits light in a proportion of not more than 5% of the total received light energy.
Further, the detection device is a wavefront sensor; or,
the detection means is a charge coupled device CCD sensor.
In one or more embodiments of the fluorescence excitation device provided in the present invention, the excitation light source emits an excitation light beam, the excitation light beam passes through the reflective light-gathering device and is output by the light guide tube through homogenization, so that light spots of the excitation light beam are homogenized to a certain extent, after the excitation light transmitted by the fluorescent crystal light-receiving guide tube is excited to emit light, the light is reflected to the reflective light-gathering device by the reflective part disposed on a side of the fluorescent crystal away from the light guide tube, and is collimated and reflected by the reflective light-gathering device to the deformable mirror.
On the one hand, the deformable mirror can deform the surface of the deformable mirror according to the control of the driving part, so that the reflection angle of an incident beam can be changed, after the fluorescent beam is reflected by the deformable mirror, the transmission angle of the beam becomes diversified, the diversity of the beam angle also enables the energy distribution of the beam to be uniform, the diversification of the beam angle avoids the fluorescent beam from irradiating the same position of the optical lens for a long time, light spots formed at different time points are superposed, the intensity contrast of the light intensity of different areas of the fluorescent light spots is reduced, and the energy distribution of the light spots of the fluorescent beam is also homogenized.
On the other hand, because fluorescence crystal excited surface one side hugs closely the light pipe setting to the fluorescence that the excitation produced is all collected by the light pipe basically, and the fluorescence beam is reemitted after having passed through the multiple reflection of light pipe, can play certain homogenization to fluorescence beam, compares simultaneously and collects through the lens among the prior art and loses the beam of big divergence angle easily, has reduced the light loss, has improved the collection efficiency of light.
Furthermore, because the fluorescence excitation device is also provided with the detection device, part of the fluorescence is transmitted by the deformable reflector and is detected by the detection device to obtain the light spot distribution of the fluorescence, and the detection device forms a feedback signal according to the light spot distribution condition and provides the feedback signal for the driving part of the deformable reflector, the deformation of the deformable reflector has purposiveness and controllability, and the condition of uneven fluorescent light spot distribution is improved in time.
The embodiment of the invention also provides a projection light source, and a fluorescence excitation device applying the technical scheme comprises:
wherein, fluorescence crystal is fixed to be set up between light pipe and the transformational mirror, and fluorescence crystal receives the light beam excitation that reflection-type beam condensing unit passed through to produce the fluorescence of first colour, and this projection light source still includes:
the second laser light source is used for emitting laser beams of a second color; the first dichroic mirror is used for transmitting the fluorescence of the first color and reflecting the laser beam of the second color; the third laser light source is used for emitting laser beams of a third color; a second dichroic mirror for transmitting the fluorescent light of the first color and the laser light beam of the second color, and reflecting the laser light beam of the third color; the first dichroic mirror and the second dichroic mirror are arranged on a transmission path of an incident beam of the deformable reflector; or the first dichroic mirror and the second dichroic mirror are arranged on a transmission path of the light beam reflected by the deformable reflecting mirror; or one of the first dichroic mirror and the second dichroic mirror is arranged on the transmission path of the incident light beam of the deformable mirror, and the other is arranged on the transmission path of the reflected light beam of the deformable mirror;
and, a projection light source, the fluorescence excitation device of using above-mentioned technical scheme, wherein, fluorescence crystal sets up on the swiveling wheel, is provided with the fluorescence crystal that the excited produced first colour fluorescence and the fluorescence crystal that the excited produced second colour fluorescence along the circumference on the swiveling wheel, then projection light source still includes:
the third laser light source is used for emitting laser beams of a third color; a third dichroic mirror for transmitting the fluorescence of the first color and the fluorescence of the second color and reflecting the laser beam of the third color; the third dichroic mirror is arranged on a transmission path of an incident beam of the deformable reflector; or the third dichroic mirror is arranged on the transmission path of the light beam reflected by the deformable reflecting mirror;
the fluorescent crystal is arranged on the rotating wheel, and the fluorescent crystal which is stimulated to generate first color fluorescence, the crystal which is stimulated to generate second color fluorescence and the fluorescent crystal which is stimulated to generate third color fluorescence are arranged in the original circumferential direction of the rotating wheel, wherein an excitation light source is an ultraviolet light source;
in the above projection light source scheme, the first color is green, the second color is red, and the third color is blue.
The projection light source provided by one or more embodiments of the invention employs the fluorescence excitation device of the above technical scheme, so that the uniformity of fluorescence can be improved, the light receiving efficiency of fluorescence can be improved, and the illumination quality and the overall brightness of the light source can be improved.
The embodiment of the invention also provides projection equipment which comprises an optical machine, a lens and the projection light source applying the technical scheme, wherein the projection light source provides illumination for the optical machine, and the optical machine modulates light beams of the light source, outputs the light beams to the lens for imaging and projects the light beams to a projection medium to form a projection picture.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
FIG. 1A and FIG. 1B are schematic diagrams of two optical architectures for providing fluorescence excitation illumination provided by the prior art;
FIG. 2A is a schematic diagram of an optical architecture of a fluorescence excitation device according to an embodiment of the present invention;
FIG. 2B is a schematic diagram of an optical architecture of another fluorescence excitation device according to an embodiment of the present invention;
FIG. 2C is a schematic diagram of an optical structure of a projection light source shown in FIG. 2B according to an embodiment of the present invention;
FIG. 3A is a schematic diagram of the distribution of energy of a fluorescent light beam before modulation;
FIG. 3B is a schematic diagram showing the energy distribution of the modulated fluorescent light beam after energy homogenization of the fluorescent light spot;
FIG. 4A is a schematic diagram of light intensity distribution of light spots before modulation;
FIG. 4B is a schematic diagram of the light intensity distribution of the modulated light spots;
FIG. 4C is a schematic diagram illustrating a phase distribution of the light beam and an intensity distribution of the light beam detected by the detecting device according to the embodiment;
FIG. 5 is a schematic view of an optical structure of another projection light source provided in FIG. 2B according to an embodiment of the present invention;
FIG. 6 is another optical architecture provided by the optical architecture of the projection light source shown in FIG. 2C according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of another optical structure provided by the embodiment of the invention based on the optical structure of the projection light source shown in FIG. 6;
FIG. 8 is a schematic diagram of an optical structure of a projection apparatus provided by the projection light source shown in FIG. 5 according to an embodiment of the present invention;
fig. 9 is a schematic view of a laser projection apparatus according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As described in the background art, the illumination mode of the fluorescence excitation light source provided by the prior art has uneven light distribution and low light collection efficiency, and to solve the above mentioned problems, the embodiment of the present invention provides a fluorescence excitation device, a projection light source and a projection apparatus.
The first embodiment,
Referring to fig. 2A, an optical architecture of a fluorescence excitation device according to an embodiment of the present invention is schematically illustrated.
As shown in fig. 2A, the optical structure of the fluorescence excitation device includes:
the excitation light source 201 may be a blue laser in a specific embodiment, or an ultraviolet laser, and a blue laser is taken as an example in this example.
The reflective light-gathering device 203 may be a parabolic reflector in which the concave surface of the paraboloid is coated with a highly reflective film, and is a reflective surface, a light guide 204, a fluorescent crystal 205, and a reflective component 206. And, since the light-passing hole of the reflective light-collecting device 203 is usually set to a certain size in order to reduce the escape of the reflected light, that is, to reduce the loss of the fluorescence reflected light, it is possible to make the size smaller. In order to transmit all the laser beam through the aperture, a lens 202 is further provided in the optical path for focusing and condensing the excitation beam.
In the above optical architecture, the fluorescence excitation process is as follows:
blue laser 201: for emitting blue laser light, the blue laser 201 may be one or more lasers (only 3 are exemplarily shown in the figure), and the plurality of lasers may adjust the brightness of the whole screen.
The laser light emitted from the blue laser 201 passes through the lens 202, and the lens 202 converges the laser beam, and preferably, a reflective light condensing device 203 is disposed at the beam focusing point, and the reflective light condensing device 203 has a light passing hole for passing through the laser beam converged by the lens 202. The laser beam converged by the lens 202 is incident into the light-passing hole of the convex curved surface of the reflection type condenser 203 in a converged state as much as possible, and in practical implementation, the light-passing hole may be positioned at a focus point where the laser beam is converged or in the vicinity of the focus point.
The laser beam enters the light guide 204 in a divergent state after passing through the light-passing hole of the reflective light-gathering device 203, the light guide 204 includes a first end surface and a second end surface, the excitation beam enters the light guide from the first end surface and exits from the second end surface to the fluorescent crystal, and the area of the first end surface is larger than that of the second end surface. In this example, a laser beam is incident from the large end face of the light guide 204, and the light guide 204 is used to guide the laser beam to the fluorescent crystal 205 and emit fluorescence generated by excitation from the small end face of the light guide. The purpose of setting up the light pipe like this is that, because the excitation beam transmits with the state of diverging again after converging after passing through the light-passing hole to and, the luminous area of fluorescence crystal is less, and is close to the light pipe setting, in order to improve the receipts light efficiency of excitation beam and guarantee the receipts light of fluorescence, set up the area that is greater than the terminal surface that fluorescence was received in the terminal surface of excitation beam income plain noodles. Meanwhile, the conical light guide pipe can also compress the area of a light spot emitted after the laser beam is transmitted in the light guide pipe, so that the light power density excited by the fluorescent crystal can be ensured.
The light pipe 204 can be a tapered light pipe, which can be a solid light bar or a hollow light bar, and the inner surface of the light pipe 204 is coated with a high-reflectivity film layer to reduce the light leakage loss of the light beam from the light pipe from inside to outside, or under the condition that the inner surface is not easy to be plated with the high-reflectivity film layer, the high-reflectivity film layer can be plated on the outer surface, so that the light can not leak from the inside of the light pipe 204.
The fluorescent crystal 205 is disposed close to the light guide 204, and specifically, the excited surface of the fluorescent crystal 205 is disposed close to the excitation light exiting surface of the light guide 204. The light pipe 204 directs the excitation light beam to be incident on the fluorescent crystal 205, which excites the fluorescent crystal to emit green fluorescent light. The fluorescent crystal is provided with a green fluorescent crystal, certainly, a yellow fluorescent crystal can be also provided, and the fluorescent crystals on the market at present are mainly the green fluorescent crystal and the yellow fluorescent crystal because of high conversion efficiency, and certainly, the fluorescent crystals can be fluorescent crystals of other colors, such as red, purple and the like, and the embodiment of the invention does not specifically limit the fluorescent crystals. Compared with the traditional fluorescent powder, the fluorescent crystal has the difference that the fluorescent crystal can be used as a single excited component without depending on a supporting device, and the temperature resistance of the fluorescent crystal is better.
The fluorescence generated by excitation is reflected by the reflecting member 206 closely attached to the rear surface of the fluorescent crystal 205, and then is reflected multiple times inside the light guide 204, and is emitted from the large end surface of the light guide, and reaches the reflective light-collecting device 203. The reflection type condenser 203 collimates the fluorescence emitted from the light guide 204 with a certain divergence angle range into a parallel beam, and deflects the entire optical path of the fluorescence by 90 degrees, and then enters the deformable mirror 207. Wherein the reflective surface of the reflective concentrator 203 is generally parabolic in shape, the curvature of the parabola can be optimally designed according to the size of the port of the light pipe 204 and the distance between the reflective concentrator 203 and the light pipe 204.
The reflective member 206 may be a mirror, and the surface thereof is plated with a high reflective film. The portion of the fluorescent light incident on the surface can be reflected back. In one implementation, the reflective member may be a reflective film coated on the surface of the fluorescent crystal 205 away from the light pipe 204 to reflect light in the fluorescent wavelength band.
Because the fluorescence emits light in all directions, a part of the fluorescence generated by excitation is emitted toward the reflecting member 206, and then reflected by the reflecting member 206 back to the second end surface of the light guide 204, and another part of the fluorescence generated by excitation is directly collected by the second end surface of the light guide 204, so that the fluorescence is emitted from the first end surface after being reflected by the light guide 204 for multiple times, and is incident on the reflecting surface of the reflective light-gathering device 203 and is reflected in a collimated manner.
The collimated and reflected fluorescence reaches the deformable mirror 207, the surface of the deformable mirror 207 has a convex-concave structure and can be controlled by the driving part, the distribution of the convex-concave structure of the surface changes, and the shape of the surface is deformed.
In one embodiment, the driving algorithm of the driving component of the deformable mirror 207 is a random function algorithm, which can be implemented by software programming in the prior art and will not be described in detail herein, in order to generate randomness to the reflection angle of the light beam by a random convex-concave structure distribution. That is, in this fluorescence excitation device, the deformable mirror 207 is driven by a random function to change the random uneven distribution of the surface thereof, so that the divergence angle of the reflected light beam is also diversified, and the diversified divergence angle can equalize the distribution of the concentrated energy of the light spot, and finally the overall distribution of the light spot tends to be uniform.
And, in another implementation, as shown in fig. 2B, the fluorescence excitation device further includes a detection device 208, which in an implementation may be embodied as a wavefront sensor 208. Wherein the deformable mirror 207 reflects a majority of the light beam reflected from the reflective light condensing device 203 and transmits a minority of the light beam reflected from the reflective light condensing device 203, wherein the transmitted light beam is only used for detection by the detection device, and therefore, in order to reduce the energy loss of the transmitted portion, the deformable mirror 207 transmits light in a proportion of the total received light energy of not more than 5%. Specifically, the deformable mirror 207 may be disposed at 45 degrees, and the beam splitter may have a reflectivity of more than 98% and a transmissivity of 1% through a coating process, so that a very small portion of the light beam is transmitted out of the beam splitter.
The wavefront sensor 208 is disposed on the back of the deformable mirror 207, the wavefront sensor 208 receives light from a very small portion transmitted by the deformable mirror 207, and the wavefront detector 208 is configured to detect the distribution intensity of the transmitted light beam spot, so as to obtain the uniformity of the light spot. The wavefront sensor 208 forms a feedback signal according to the detected uniformity, and outputs the feedback signal to the driving unit of the deformable mirror 207, and the driving unit of the deformable mirror 207 adjusts the convex-concave structure of the deformable mirror 207 to be changed according to the feedback signal.
That is, in this embodiment, the entire operation of the deformable mirror 207 is performed by feedback control whose feedback signal is provided by the wavefront sensor 208. By arranging the wavefront sensor to detect the distribution of the fluorescent light spots and establishing a feedback loop, the convex-concave distribution deformation of the surface of the deformable reflector 207 has purposiveness and controllability, and the condition of uneven distribution of the fluorescent light spots can be timely improved.
The shape of the end surface of the light guide 204 shown in fig. 2A or fig. 2B may be designed to be circular, elliptical, rectangular or trapezoid according to the actual requirement of the product, which is not specifically limited in the embodiment of the present invention, but both end surfaces of the light guide are in a form of one large end surface and one small end surface, that is, the area ratio of the large end surface to the small end surface is greater than 1.
The wavefront sensor shown in fig. 2A or fig. 2B is obtained by adding a microlens array in front of a Charge Coupled Device (CCD) sensor, and obtaining a wavefront local slope through the microlens array, and measuring parameters such as light intensity, phase, aberration, and the like of a light beam in real time according to the wavefront local slope. Of course, the wavefront sensor may also be another detection device with the same function, and the embodiment of the present invention does not specifically limit this.
The laser shown in fig. 2A or fig. 2B may be a semiconductor laser, a solid-state laser, a gas laser, etc., which is not specifically limited in the embodiment of the present invention, and of course, the blue laser 201 may also be other illumination Light sources, such as a Light Emitting Diode (LED), etc., which may also be mixed to emit Light therebetween, as long as the wavelength emitted by these Light sources is smaller than the wavelength of the stimulated fluorescence, so as to be capable of performing the excitation function, which is also not specifically limited in the embodiment of the present invention.
The adjustment process of the fluorescent light spot uniformity is explained below with reference to the drawings. In this implementation, the optical architecture example provided in fig. 2B is used for illustration.
Referring to FIGS. 3A and 3B, the energy distribution of the fluorescent light beam is shown. The abscissa of FIGS. 3A and 3B represents the divergence angle of the light beam, and the ordinate represents the energy density (W/cm) of the light beam2）。
FIG. 3A is a diagram illustrating the distribution of energy of a fluorescent light beam before being modulated. In practice, there may be a local over-bright or over-dark distribution in the non-central area of the spot, and the figure is only used to illustrate the energy distribution of one fluorescent spot beam. FIG. 3B is a schematic diagram of the energy distribution of the modulated fluorescent light beam after energy homogenization of the fluorescent light spot. Different curves in fig. 3B show the distribution of the light intensity energy of the fluorescent light spot at different angles after being modulated by the deformable mirror, and it can be seen from the trend of the energy distribution of the light intensity of the whole light spot that the energy distribution of the light spot after being modulated by the deformable mirror is relatively uniform.
Fig. 4A is a schematic diagram showing the distribution of the light intensity of the light spot before being modulated by the deformable mirror, and fig. 4B is a schematic diagram showing the distribution of the light intensity of the light spot after being modulated by the deformable mirror. As can be seen from fig. 4A and 4B, the initially non-uniform light spot intensity distribution is modulated by the deformable mirror to become a flat-topped rectangular light spot intensity distribution.
Referring to fig. 4C, a phase profile and an intensity profile of a light beam detected by a wavefront sensor provided by an embodiment of the present invention are shown. The intensity is indicated by the shade of gray in the intensity profile of the light beam, wherein the light gray in the edge portion indicates a lower intensity of the light beam in that portion and the dark gray in the middle portion indicates a higher intensity of the light beam in that portion. The degree of phase advance is indicated by the shade of gray in the phase distribution diagram of the light beam, wherein the more gray indicates that the phase distribution is advanced, a voltage signal for controlling the deformable mirror is generated according to the phase distribution and the intensity distribution, and the convex-concave change of the deformable mirror is controlled by the height of the voltage signal. The deformable mirror is composed of a plurality of actuating units, is usually driven by piezoelectric ceramics or a voice coil motor, and is specifically a piezoelectric ceramic deformable mirror according to the requirements of small size and high-frequency vibration required in the implementation. The deformable mirror surface may be a continuous deformable membrane structure or may be a myriad of small mirrors each independently. In one embodiment, the detected wavefront profile data, which reflects the phase and intensity profiles, can be used as input parameters for an SPGD algorithm or an annealing algorithm, with which a voltage signal for controlling the deformable mirror is generated. The principle of the SPGD algorithm or the annealing algorithm is as follows: wave aberration (wave aberration refers to optical path difference between an actual wave surface and an ideal wave surface) is determined according to phase distribution and intensity distribution, wave aberration with opposite signs is generated according to the determined wave aberration, voltage signals for controlling the deformable mirror are generated according to the wave aberration with the opposite signs and act on a convex-concave structure (namely a reflecting surface unit), and irregular wave front distribution of light spots measured by the wave front sensor can be optimized into ideal wave front distribution of an approximate plane through multiple iterative operations, so that uniform distribution of the light spots is achieved.
It can be seen from the optical structure shown in fig. 2B that the wavefront sensor receives a very small portion of the light beam transmitted from the deformable mirror, detects the distribution intensity of the light spot of the transmitted light beam, so as to obtain the uniformity of the light spot, forms a feedback signal according to the detected uniformity, and outputs the feedback signal to the driving part of the deformable mirror, where the driving part controls the convex-concave structure of the deformable mirror surface to change, and after the light beam is reflected by the convex-concave structure of the deformable mirror, the transmission angle of the light beam becomes diversified, and the energy distribution becomes uniform due to the diversification of the light beam angle, and diversification of the light beam angle prevents the laser beam from irradiating the same position of the optical lens for a long time, so that the light spots formed at different time points are superposed and homogenized, and the speckle effect is weakened through the integral effect of human eyes, thereby reducing the speckle of the light source, The quality of the projected image is degraded, and simultaneously, the strong and weak contrast of the light intensity of the light spots can be reduced, so that the effect of light spot distribution homogenization is achieved.
In addition, in the optical architecture shown in fig. 2A and 2B, the fluorescence generated by excitation is basically collected by the light guide pipe closely attached to the fluorescent crystal, so that the loss of the fluorescence is less, compared with the prior art, the collection efficiency of the fluorescence is improved, the hot spot of the emergent light spot is reduced by the homogenized fluorescence, in the light source composed of laser and fluorescence, the hot spot is mainly caused by the fluorescent light spot, namely, the spot with higher light intensity is reduced, and the reliability of long-term illumination of each light source device is improved. Furthermore, the utilization rate of the light energy is improved, so that the proportion of converting the light energy into the heat energy is reduced, the heat dissipation structure is greatly simplified, and the volume of the whole projection light source is reduced compared with the structural volume of the existing projection light source.
Meanwhile, because the light pipe component is used, the excitation light beam firstly homogenizes through the light pipe and then excites the fluorescent crystal, so that the nonuniformity degree of the fluorescence generated by excitation, which is indirectly caused by the nonuniformity of the excitation light source, can be fundamentally reduced, and the fluorescence generated by excitation is also homogenized through the light pipe and then emitted, so that the light pipe component has a certain homogenization effect on the fluorescence light beam.
Example II,
As shown in fig. 2C, the fluorescence excitation device based on fig. 2B provides a schematic view of an optical architecture of a projection light source, and for the description of the fluorescence excitation device, reference may be made to the contents of the first embodiment, which is not repeated herein.
In this example, the fluorescent crystal 205 is fixedly disposed between the light pipe 204 and the reflective member 206, the fluorescent crystal 205 is excited by the light beam transmitted by the reflective light-gathering device 203 to generate the first color fluorescent light, and the projection light source further includes: a second laser light source 210, in particular a blue laser, a third laser light source 211, in particular a red laser, and a first dichroic mirror 209a, a second dichroic mirror 209 b.
Here, the first dichroic mirror 209a transmits the green fluorescence reflected from the deformable mirror 207, and reflects the laser light emitted from the blue laser 210.
The green fluorescence transmitted by the first dichroic mirror 209a and the reflected blue laser light reach the second dichroic mirror 209b, a red laser 211 is provided behind the second dichroic mirror 209b, and the second dichroic mirror 209b reflects the laser light emitted by the red laser 211. The green fluorescent light and the blue laser light transmitted by the first dichroic mirror 209a and the red laser light emitted by the red laser 211 reflected by the second dichroic mirror 209b are mixed to form white light for projection, and of course, the light of three colors may be coupled into an optical fiber (not shown in the figure), which is not limited in the embodiment of the present invention.
In the above example, the dichroic mirrors are disposed on the transmission path of the reflected light beam of the light splitting device as the light combining elements. Those skilled in the art can understand that, as long as the light combination purpose can be achieved, the placement positions of the other two laser light sources and the position of the dichroic mirror light combination component can be changed, for example, the dichroic mirror light combination component is arranged on the transmission path of the incident light beam in the light splitting device, or respectively located in the transmission path of the incident light beam or the transmission path of the reflected light beam in the light splitting device, as long as the final light combination purpose can be achieved.
In the example of fig. 2C, only one color fluorescent crystal is provided, but two colors fluorescent crystals may be provided, where the two colors fluorescent crystals are provided on a rotating wheel, the rotating wheel rotates according to a set time sequence, a light source that emits a light beam with a color different from that of the two colors fluorescent crystals is provided in the projection light source, the light source excites the rotating wheel to generate two colors fluorescent light, only one dichroic mirror is provided, the dichroic mirror transmits the two colors fluorescent light generated by excitation and reflects the light beam emitted by the light source, where the rotating wheel may be provided in a circular shape, and the two colors fluorescent crystals provided on the rotating wheel are provided in a fan shape on the rotating wheel; of course, three color fluorescent crystals may be provided, and at this time, the three color fluorescent crystals are disposed on a rotating wheel, the rotating wheel rotates according to a set time sequence, the light source in the projection light source excites the rotating fluorescent wheel to generate three color fluorescent lights, and no additional light source is required to be disposed in the projection light source, wherein the rotating wheel may be disposed in a circular shape, and the three fluorescent crystals disposed on the rotating wheel are disposed on the rotating wheel in a fan-shaped distribution.
Example III,
Referring to fig. 5, an optical architecture of another projection light source based on fig. 2B is shown. The schematic diagram of the optical architecture shown in fig. 5 is similar to the architecture diagram shown in fig. 2B, except that the red laser and the blue laser are placed at different positions, and the transmission path of the light beam in fig. 5 is the same as the architecture diagram shown in fig. 2B, which is not specifically described here, and in particular, refer to the above detailed description of fig. 2B.
In the optical configuration diagram of the projection light source shown in fig. 5, a dichroic mirror 209, a blue laser 210, and a red laser 211 are provided in the incident light path of the anamorphic mirror 207, compared to fig. 2B. The dichroic mirror 209 transmits the green fluorescence reflected from the reflection type condenser 203 to the deformable mirror 207, and reflects the blue laser emitted from the blue laser 210 and the red laser emitted from the red laser 211 to the deformable mirror 207, wherein the deformable mirror 207 transmits a very small part of the light beam through the coating process, the transmitted part of the light beam is a part of the light beam for detecting the uniformity of the fluorescent light spots, and reflects most of the light beam transmitted and reflected from the dichroic mirror, the reflected light beam includes the green fluorescence, the blue laser and the red laser, and the three light beams are mixed to form white light for projection.
In the projection light source optical framework of the example, when the laser beam is incident to the surface of the deformable reflector 207 at the same time, after the laser beam is reflected by the rugged surface of the deformable reflector, the transmission angle of the beam becomes diversified, the fluorescence is homogenized to a certain extent, simultaneously, the Gaussian energy distribution of the laser beam becomes homogenized, the speckle effect is weakened through the integration effect of human eyes, and then the problems of light source speckle and projection image quality deterioration are reduced.
Example four,
In another embodiment shown in fig. 2B, instead of using the wavefront sensor, a CCD sensor may be used to measure the spot distribution of the light beam, as shown in fig. 6.
Referring to fig. 6, another optical architecture provided for the embodiment of the present invention based on the optical architecture of the projection light source shown in fig. 2B is shown, and the schematic diagram of the optical architecture shown in fig. 6 is similar to the architecture shown in fig. 2B, except that fig. 2B uses a wavefront sensor and fig. 6 uses a CCD sensor made of a semiconductor material with high sensitivity, which can convert light into charges, convert the charges into digital signals through an analog-to-digital converter chip, and the digital signals are compressed and stored in a flash memory or a built-in hard disk card inside the camera, so that data can be easily transmitted to a computer, and the image can be modified as needed and desired by means of processing means of the computer.
In the optical structure shown in fig. 6, the transmission path of the light beam is the same as that in fig. 2B, but the feedback control process for controlling the deformation mirror to change is different from that in fig. 2B, and the transmission path of the laser light is not specifically described here, and reference is made to the description of fig. 2B above. In fig. 6, a very small portion of the fluorescence transmitted from the deformable mirror 207 is irradiated onto the CCD sensor 208a, and when the light intensity distribution on the CCD sensor 208a is not uniform, a spot image with non-uniform gray scale is formed, and a random parallel gradient descent algorithm (SPGD for short) forms a feedback signal to control the deformable mirror according to the gray scale value of the fluorescence on the irradiated surface as a measure of the energy concentration ratio, so that the gray scale of the irradiated surface is rapidly concentrated, and a uniform energy spot with high energy utilization ratio is formed. The whole process combines with SPGD algorithm to adjust the distribution rule of the convex-concave structure on the surface of the deformable reflector, changes the homogenization degree of the reflected fluorescence, and further improves the homogenization degree of the fluorescence light beam. The SPGD algorithm does not need to carry out wavefront measurement, does not need to adopt a wavefront sensor in the system, does not need to carry out wavefront reconstruction, but directly takes imaging definition and received light energy as performance indexes as an objective function of algorithm optimization, and reduces the complexity of the system and the algorithm.
Example V,
Referring to fig. 7, another optical architecture diagram is provided for an embodiment of the invention based on the optical architecture of the projection light source shown in fig. 6.
The schematic diagram of the optical architecture shown in fig. 7 is similar to the architecture diagram shown in fig. 6, except that the red laser and the blue laser are placed at different positions, and the transmission path of the light beam in fig. 7 is the same as the architecture diagram shown in fig. 6, and will not be described in detail here, and in particular, refer to the above detailed description of fig. 6.
In the optical configuration diagram of the projection light source shown in fig. 7, compared with fig. 6, a dichroic mirror 209, a blue laser 210, and a red laser 211 are disposed in front of the deformable mirror 207, the dichroic mirror 209 transmits green fluorescent light reflected from the reflection-type light condensing device 203 to the deformable mirror 207, reflects blue laser light emitted from the blue laser 210 and red laser light emitted from the red laser 211 to the deformable mirror 207, the deformable mirror 207 transmits a very small portion of fluorescent light for detecting spot uniformity and reflects a large portion of light beams transmitted and reflected from the dichroic mirror, the reflected light beams include green fluorescent light, blue laser light, and red laser light, and the three light beams are mixed to form white light for projection.
Example six,
Referring to fig. 8, an optical architecture of a projection apparatus provided based on the projection light source shown in fig. 5 according to an embodiment of the present invention is schematically shown. Compared with fig. 5, fig. 8 includes an excitation light source 501, a focusing lens 502, a reflective light-gathering device 503, a light guide 504, a fluorescent crystal 505, a reflective component 506, a deformable mirror 507, a wavefront sensor 208, a second laser light source 510, a third laser light source 511, and a dichroic mirror 509, which are distributed in a manner equivalent to the excitation light source 201, the focusing lens 202, the reflective light-gathering device 203, the light guide 204, the fluorescent crystal 205, the reflective component 206, the deformable mirror 207, the wavefront sensor 208, the second laser light source 210, the third laser light source 211, and the dichroic mirror 209 shown in fig. 5, and the fluorescence excitation and spot homogenization processes thereof can also refer to the description of fig. 5, and are not repeated herein.
In the optical structure shown in fig. 8, a light uniformizing component 511, a Digital Micromirror Device (DMD) chip 512, a projection lens 513 and a projection screen 514 are added.
Specifically, the transmission path of the three-color light source beam in the device before the light evening part 511 is the same as that shown in fig. 5, and is not specifically described here. The light beams reflected from the deformable mirror 509 are mixed to form white light for projection, and the white light enters the light unifying unit 511, and the light unifying unit 511 unifies the light beams and emits the light beams onto the DMD chip 512. An illumination system (not shown) in front of the DMD chip directs the light beam to the surface of the DMD, which consists of thousands of small mirrors that reflect the light beam into a projection lens 513 for imaging and projection onto a projection screen 514 to form a projected image.
Of course, the light uniformizing component 511, the DMD chip 512, the projection lens 513 and the projection screen 514 are also disposed behind the optical structure schematic diagrams of the projection light source shown in fig. 2C, fig. 6 and fig. 7, and the projection device can also be configured, which will not be described in detail.
As can be seen from the foregoing embodiments, in one implementation of the solutions provided in the embodiments of the present invention, the deformable mirror transmits a part of the fluorescence to the detection device, the detection device detects the spot distribution of the transmitted fluorescence and forms a feedback signal to the driving part of the deformable mirror, the convex-concave structure on the surface of the deformable mirror changes according to the control of the driving part, after the light beam is reflected by the convex-concave structure on the surface of the deformable mirror, the transmission angle of the light beam becomes diversified, the energy distribution becomes uniform due to the diversification of the beam angle, and the diversification of the beam angle prevents the laser beam from being irradiated to the same position of the optical lens for a long time, so that the spots formed at different time points are superposed and homogenized, thereby reducing the strong and weak contrast of the light spot, and homogenizing the spot distribution of the light beam. In another implementation, the deformable mirror is not provided with a detection device and receives a feedback signal, but randomly changes the convex-concave distribution change of the surface, and can also improve the homogenization degree of the fluorescent light spot to a certain extent along with the time.
Examples nine,
Based on the same technical concept, the embodiment of the present invention further provides a laser projection apparatus, which may include the laser light source provided in the above embodiment of the present invention, and the laser projection apparatus may specifically be a laser cinema or a laser television, or other laser projection apparatuses.
Fig. 9 is a schematic diagram of a laser projection apparatus provided by an embodiment of the present invention.
As shown in fig. 9, the laser projection apparatus includes: a projection light source 601, an optical machine 602, a lens 603 and a projection medium 605.
The projection light source 601 is a projection light source provided in the above embodiments of the present invention, and reference may be made to the foregoing embodiments specifically, which will not be described herein again.
Specifically, the light source 601 provides illumination for the optical engine 602, and the optical engine 602 modulates a light source beam and outputs the modulated light source beam to the lens 603 for imaging, and projects the modulated light source beam onto a projection medium 604 (such as a screen or a wall) to form a projection image. The optical machine 602 is a DMD chip in the above-mentioned optical architecture based on a laser light source.
The projection device provided by the embodiment employs the projection light source of the foregoing embodiment, on one hand, the light guide tube is used for conducting multiple reflection homogenization on the excitation light and then guiding the excitation light to the fluorescent crystal for excitation, and the fluorescence generated by excitation is basically collected by the light guide tube tightly attached to the fluorescent crystal, so that light loss is reduced, the collection efficiency of the fluorescence light beam is improved, and the fluorescence light beam is homogenized and output by the light guide tube, which is beneficial to improving the homogenization degree; on the other hand, in one implementation, the light splitting device transmits part of the fluorescence to the detection device, the detection device detects the light spot distribution of the transmitted fluorescence and forms a feedback signal to be provided for the driving part of the deformable mirror, the deformable mirror changes the reflection angle of the incident light beam according to the control of the driving part, after the light beam is reflected by the deformable mirror, the transmission angle of the light beam becomes diversified, the diversification of the light beam angle also enables the energy distribution to become uniform, and the feedback control mode can enable the deformation of the deformable mirror to have purposiveness and controllability and can timely improve the condition that the fluorescence light spot distribution is not uniform. And the angles of the light beams are diversified, so that the laser beams are prevented from irradiating the same position of the optical lens for a long time, light spots formed at different time points are superposed and homogenized, the intensity contrast of the light intensity of the light spots is reduced, and the light spots of the light beams are distributed uniformly. And, in another implementation, the deformable mirror randomly changes the surface asperity profile, also improving the homogenization of the fluorescent spot over time to some extent.
Compared with the prior art, homogenized fluorescence reduces hot spots of emergent light spots, and in a light source consisting of laser and fluorescence, the hot spots are mainly caused by the fluorescent light spots, namely the spots with higher light intensity, the hot spots are reduced, the long-term illumination reliability of each light source device is improved, and the brightness uniformity and the image display quality of a projection picture are also favorably improved.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (11)
1. A fluorescence excitation device, comprising: an excitation light source that emits an excitation light beam;
a reflection-type condensing device having a light transmitting hole through which the excitation light beam passes and a reflection surface which collimates and reflects the light beam emitted from the light guide;
a light guide for guiding the light beam transmitted by the reflection type light condensing device to the fluorescent crystal and guiding the light beam reflected by the reflection member to the reflection type light condensing device;
the fluorescent crystal is closely attached to the light guide pipe and is excited by the light beam guided by the light guide pipe to generate fluorescence;
a reflecting member for reflecting the fluorescence generated by the excitation of the fluorescent crystal to the light guide;
and the deformable mirror is used for reflecting part of the fluorescence in the fluorescence reflected by the reflection type light gathering device and transmitting the other part of the fluorescence, and the surface of the deformable mirror can be driven by the driving part to deform.
2. The fluorescence excitation device according to claim 1, wherein said light guide comprises a first end surface and a second end surface, said excitation light beam enters said light guide from said first end surface and exits said light guide from said second end surface to said fluorescent crystal, and an area of said first end surface is larger than an area of said second end surface.
3. Fluorescence excitation device according to claim 1 or 2, characterized in that the driving algorithm of the driving means of the deformable mirror is a random function algorithm.
4. Fluorescence excitation device according to claim 1 or 2, characterized in that it further comprises:
and the detection device is used for detecting the spot distribution of the fluorescence transmitted from the deformable mirror, forming a feedback signal and providing the feedback signal to the driving part of the deformable mirror.
5. The fluorescence excitation device of claim 1, wherein said deformable mirror transmits no more than 5% of the total received light energy.
6. Fluorescence excitation device according to claim 4, wherein said detection means is a wavefront sensor; or,
the detection device is a Charge Coupled Device (CCD) sensor.
7. A projection light source comprising the fluorescence excitation device according to any one of claims 1 to 6, wherein the fluorescent crystal is fixedly disposed between the light guide and the deformable mirror, and the fluorescent crystal is excited by the light beam transmitted by the reflective light-condensing device to generate fluorescent light of a first color, and the projection light source further comprises:
the second laser light source is used for emitting laser beams of a second color;
a first dichroic mirror for transmitting the fluorescent light of the first color and reflecting the light beam of the second color;
the third laser light source is used for emitting laser beams of a third color;
a second dichroic mirror for transmitting the fluorescent light of the first color and the light beam of the second color, and reflecting the light beam of a third color;
the first dichroic mirror and the second dichroic mirror are arranged on a transmission path of the incident beam of the deformable reflecting mirror; or,
the first dichroic mirror and the second dichroic mirror are arranged on a transmission path of the light beam reflected by the deformable reflecting mirror; or,
one of the first dichroic mirror and the second dichroic mirror is disposed on a transmission path of the incident light beam on the deformable mirror, and the other is disposed on a transmission path of the reflected light beam on the deformable mirror.
8. A projection light source comprising the fluorescence excitation device according to any one of claims 1 to 6, wherein the fluorescent crystals are arranged on a rotating wheel, and the rotating wheel is circumferentially provided with the fluorescent crystals excited to generate fluorescence of a first color and the fluorescent crystals excited to generate fluorescence of a second color, the projection light source further comprising:
the third laser light source is used for emitting laser beams of a third color;
a third dichroic mirror for transmitting the first color fluorescence and the second color fluorescence and reflecting a third color laser beam;
the third dichroic mirror is arranged on a transmission path of the incident beam of the deformable mirror; or,
the third dichroic mirror is disposed on a transmission path of the light beam reflected by the deformable mirror.
9. A projection light source comprising the fluorescence excitation device according to any of claims 1 to 6, wherein the fluorescent crystals are arranged on a rotating wheel, and the rotating wheel is provided with the fluorescent crystals excited to generate fluorescence of a first color, the crystals excited to generate fluorescence of a second color, and the fluorescent crystals excited to generate fluorescence of a third color, wherein the excitation light source is an ultraviolet light source.
10. The projection light source of any of claims 7-9 wherein the first color is green, the second color is red, and the third color is blue.
11. A projection apparatus comprising an optical engine, a lens, and the projection light source according to any one of claims 7 to 9;
the projection light source provides illumination for the optical machine, and the optical machine modulates light source beams, outputs the light source beams to the lens for imaging, and projects the light source beams to a projection medium to form a projection picture.
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| JP6988782B2 (en) * | 2018-12-25 | 2022-01-05 | セイコーエプソン株式会社 | Light source device and projector |
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