WO2019033461A1 - Projection laser light source - Google Patents

Abstract

A projection laser light source, comprising an excitation light source (400) used for providing blue exciting light, a beam shrinking unit (500) disposed on a light emitting path of the blue excitation light source (400) and used for shrinking the exciting light, a partition filter (300) used for changing light path directions of different colored lights, and a primary lens (200) disposed between the partition filter (300) and a wavelength conversion unit (100) and used for converging the light sources from the partition filter (300) and collimating the light from the wavelength conversion unit (100), the wavelength conversion unit(100) comprising a diffusion sheet (110) and an excitation area (120, 130). By means of the laser light source, the utilization rate of light can be improved, the light source structure can be simplified, and the volume of the light source can be reduced.

Description

Projection laser source Technical field

The invention relates to a light source, in particular a projection laser source.

Background technique

With the development of solid-state light sources, light-emitting diodes (LEDs) and semiconductor lasers have gradually entered the lighting and display market.

There are two ways to generate white light or color light: one is to directly use a color light source such as red, green or blue LED to provide color light, or to use these color light to synthesize white light; the other is to use excitation light source to excite based on light wavelength conversion. The light wavelength conversion material generates color light, and then white light is synthesized by using excitation light or various color lights generated by excitation. For example, a light source capable of generating a short wavelength such as blue light or UV light is used as an excitation light source to excite a wavelength converting material such as, but not limited to, a phosphor. Taking green light as an example, the current green LED or green laser is difficult to be efficient and the price is high; on the contrary, the solid-state devices of blue and UV light are high in efficiency and low in price, and the latter scheme is used to generate green light. Has a greater market prospect.

At present, the mainstream blue laser + phosphor light source uses almost all fluorescent reflection, and the blue laser transmission scheme requires an additional relay circuit for the blue laser to realize the combination of the blue laser and the fluorescent light. Therefore, The solution has the problem that the light source structure is complicated and the volume is large.

Summary of the invention

The object of the present invention is to solve the problem of complicated structure and large volume of the light source in the prior art by using a projection laser light source.

To achieve this, the following technical solutions are provided:

A projection laser light source, comprising: a blue laser light source, providing blue excitation light; a reduction beam unit, located on a light path of the blue excitation light source, for reducing the blue excitation light; the partition filter, including two Or a plurality of partitions, each of the partitions being configured to reflect or transmit different colored lights for changing the optical path direction of the different colored lights; the primary lens is located between the partition filter and the wavelength conversion unit, Converging the blue excitation light from the partition filter to collimate the light beam from the wavelength conversion unit; the wavelength conversion unit includes a diffusion sheet and an excitation region, the wavelength conversion unit being disposed to be rotatable about the central axis, and When rotating, the light beam incident thereon may be repeatedly repeatedly contacted with the diffusion sheet or the excitation region; wherein the surface of the diffusion plate of the wavelength conversion unit is plated with a blue anti-reflection film, and when the blue excitation beam reaches the diffusion sheet, the diffusion sheet It is angularly diffused and reflected, enters the primary lens, and the output light intensity is distributed in a circular color. The intensity of the inner circular region is lower than that of the outer annular region. ; Excitation region of the wavelength conversion unit comprises one or a plurality of colored fluorescent areas, corresponding to excitation of the blue color light when the excitation beam is incident and reflected excitation zone reaches.

Preferably, the partition of the partition filter comprises a first-stage splitting area and a second-level coating area, the first-stage splitting area reflects or transmits the incident blue excitation light source, and the first-stage splitting area is located in the partition filter. The center area of the film.

Preferably, the primary spectroscopic region of the partition filter is a dichroic film plated on the partition filter or a dichroic filter glued on the partition filter, the secondary coating region The coating area surrounding the primary splitting zone is disposed on the partition filter.

Preferably, the excitation region of the wavelength conversion unit comprises a red fluorescent region and a green fluorescent region.

Preferably, the projection laser light source further comprises a second red light source, wherein the second red light source is a red LED light source or a red laser light source, and the emitted light of the second red light source is finally reflected or transmitted through the partition filter, and The blue laser source eventually merges and reflects through the partitioned filter.

Preferably, the projection laser source further comprises a secondary lens; the secondary lens is located between the partition filter and the second red light source, and converges or diverges the emitted light from the second red light source.

Preferably, the excitation region of the wavelength conversion unit comprises a green fluorescent region.

Preferably, the primary splitting region of the partition filter reflects a green light beam that transmits a red light beam and a blue light beam, and the second coating region reflects the green light beam and the blue light beam transmits the red light beam.

Preferably, the primary splitting region of the partition filter transmits a green light beam to reflect the red light beam and the blue light beam, and the second coating region transmits the green light beam and the blue light beam reflects the red light beam.

Preferably, the first-stage splitting region of the partition filter reflects a blue light beam, and transmits a red light beam and a green light beam; the second coating region is coated with an anti-reflection film, and transmits a blue light beam, a red light beam, and a green light beam.

Preferably, the first-stage splitting region of the partition filter transmits a blue light beam, and reflects a red light beam and a green light beam, and the secondary coating region is plated with a film that reflects blue light, red light, and green light.

Preferably, further comprising a color wheel and a tertiary lens having a blue light transmissive region, a green filter region and a red filter region rotatable about a central axis; the color wheel is disposed on the exiting light of the partition filter In the direction of the optical path, the tertiary lens is disposed between the color wheel and the partition filter for concentrating the outgoing light of the partition filter and the concentrated light beam is incident on different filter regions of the color wheel; The excitation region of the wavelength conversion unit includes a yellow fluorescent region and a green fluorescent region; the color wheel is configured to cause the stray light from the partition filter to be reflected and removed after being incident on the green filter region and the red filter region.

Preferably, the blue excitation beam is diffused through the diffusion sheet and reflected into the primary lens output circularly distributed color light, the intensity distribution of the annularly distributed color light has a valley region, and the valley region length is greater than or equal to the level of the partition filter. The length of the longer side of the splitting zone is the projected length of the light intensity section.

The invention has the beneficial effects that the optical path is changed by the partition filter having the first-stage splitting area and the second coating area, and the light is enhanced by the diffusion sheet with the annular angle distribution and the primary lens with the convergence collimation function. Utilization, thereby eliminating the blue light relay optical path, simplifying the light source structure, reducing the volume of the light source, and processing is simple and easy to achieve.

DRAWINGS

1 is a schematic structural view of a light source according to Embodiment 1;

2 is a schematic structural view of a partition filter of Embodiment 1;

3 is a distribution diagram of a wavelength conversion unit of Embodiment 1;

4 is an angular distribution diagram of a blue laser after diffusion reflection of a diffusion sheet according to Embodiment 1;

5 is a light intensity distribution diagram of the blue laser of the first embodiment after being collimated by the primary lens;

6 is a schematic structural view of a light source of Embodiment 2;

7 is a schematic structural view of a light source of Embodiment 3;

8 is a distribution diagram of a third wavelength conversion unit of the embodiment;

9 is a schematic structural view of a light source of Embodiment 4;

10 is a schematic structural view of a light source of Embodiment 5;

11 is a distribution diagram of a wavelength conversion unit of Embodiment 5;

12 is a schematic structural view of a light source of Embodiment 6;

Figure 13 is a schematic view showing the structure of the light source of the seventh embodiment;

Figure 14 is a distribution diagram of the seven color wheel of the embodiment;

15 is a distribution diagram of a wavelength conversion unit of Embodiment 7;

Figure 16 is a schematic view showing the structure of the light source of the eighth embodiment.

Detailed ways

The technical solution is described in detail below with reference to the accompanying drawings and embodiments.

Embodiment 1

FIG. 1 is a schematic structural view of a light source of the present embodiment, including a blue excitation light source 400 for providing blue excitation light, wherein the blue excitation light source 400 may not be limited to include a blue laser light source; a beam splitting unit 500 for attenuating the excitation light on the 400 light exiting path; a partitioning filter 300 for changing the optical path direction of the different color lights; and a primary lens between the partitioning filter 300 and the wavelength converting unit 100 200.

The primary lens 200 converges the light beams from the partition filter 300 to collimate the light beams from the wavelength conversion unit 100.

The wavelength conversion unit 100 includes a diffusion sheet and an excitation region, the wavelength conversion unit is disposed to be rotatable about a central axis, and the light beam incident thereon can be repeatedly repeatedly contacted with the diffusion sheet or the excitation region in turn when the rotation is performed. When the colored light reaches the diffusion sheet, the color light is angularly diffused and reflected, and when the excitation light reaches the excitation region, the corresponding color light is excited and reflected.

The partition filter 300 includes two or more partitions, each of which may be arranged to reflect or transmit different colored lights. As shown in FIG. 2, the partition filter 300 includes a first-stage splitting region 310 of a rectangular structure and a secondary coating region 320 of a rectangular structure, and the first-stage splitting region 310 reflects the incident blue excitation light source 400 or Transmitted, the first side splitting area has a long side width of m, and the first stage splitting area 310 reflects or transmits the light emitted from the narrowing unit 500. The first stage splitting area 310 is preferably located in the central area of the partition filter 300 or the second coating area 320. .

The secondary coating zone 320 is preferably rectangular, and the effect of the rectangle is to reduce the area occupied by the first coating zone, because the outer contour of the blue laser beam incident on the first coating zone is close to a rectangle, and has a long and short side, and the first coating zone should cover the incident. The upper laser beam, therefore set to a rectangle, guarantees complete coverage while minimizing the area it occupies. Of course, the secondary coating zone 320 can also be selected according to actual needs to cover the laser beam incident thereon as much as possible.

The primary beam splitting region 310 of the partition filter is a color separation film plated on the partition filter 300 or a color separation filter glued on the partition filter, and the secondary coating region 320 A coating region surrounding the primary beam splitting region 310 is disposed on the partition filter 300.

The surface of the diffusion sheet of the wavelength conversion unit 100 is preferably plated with a blue antireflection film which serves to reduce the blue reflectance of the surface of the wavelength conversion unit, thereby reducing the blue light reflected into the optical path.

When the blue excitation beam 400 reaches the diffusion sheet, the diffusion sheet angularly diffuses and reflects it, and enters the primary lens 200, and the output light intensity distribution is a circular color light, and the inner circular area has a lower intensity than the outer annular area; the wavelength conversion The excitation region of the cell includes one or more fluorescent regions of colored light that excite the corresponding colored light and reflect when the blue excitation beam 400 is incident upon reaching the excitation region. The excitation region of the wavelength conversion unit 100 includes one or more fluorescent regions of colored light that excite the corresponding colored light and reflect when the blue excitation beam is incident on the excitation region.

As shown in the distribution of the wavelength conversion unit 100, the reflective diffusion sheet 110 diffuses the angle of the blue excitation beam. In this embodiment, the excitation region includes a red fluorescent region 130 and a green fluorescent region 120. Excitation produces corresponding red and green fluorescence.

In this embodiment, the primary spectroscopic region of the partition filter 300a reflects blue light, transmits red light and green light, and the secondary coating region is plated with a film that transmits blue light, red light, and green light.

The narrowing unit 500 preferably includes a positive focus lens 501 and a negative focus lens 502. The reduction unit 500 is preferably provided as a combination of positive and negative lenses, but it is also possible to provide a combination of positive lenses according to actual needs.

The reflective diffuser 110 converts the color light whose original angular distribution is Gaussian into a color light whose angular distribution is a circular distribution, as shown in FIG. 4; the color light of the angular distribution passes through the primary lens, and the light intensity distribution is formed into a circular distribution. Color light, the intensity of the inner circular area is lower than that of the peripheral annular area, the light intensity distribution has a low valley area, and the length of the low valley area a is greater than or equal to the projection length of the longer side length m of the partition filter in the light intensity section That is, ab is greater than or equal to m x sin45°, so that energy loss due to reflection of the central inner circle region when passing through the primary splitting region can be reduced.

The blue excitation light source 400 emits a blue laser light, and is contracted by the attenuator unit 500 to reach the primary spectroscopic region 310 of the partition filter 300. The primary spectroscopic region 310 is a dichroic film plated on the partition filter or For the color separation filter glued on the partition filter, the blue laser light is reflected to the primary lens 200, and the primary lens 200 converges the blue laser light to the wavelength conversion unit 100, and when the blue laser light contacts the wavelength conversion unit 100 In the reflective diffuser 110, the blue laser light is angularly diffused and reflected to the primary lens 200. The primary lens 200 refracts the blue laser light to the secondary coating region 320 of the partition filter 300 according to its light intensity distribution characteristic. The secondary coating filter 320 is plated with a film that transmits blue light, green light, and red light to transmit the blue laser light; when the blue laser light contacts the red fluorescent region 130 or the green fluorescent region 120 of the wavelength conversion unit 100, Red or green light is generated and reflected to the primary lens 200, and is refracted by the primary lens 200 to the secondary coating region 320 and the primary spectral region 310 to be transmitted.

Embodiment 2

FIG. 6 is a schematic view showing the structure of the light source of the embodiment. The main difference between the laser source and the wavelength conversion unit is that the first-order beam splitting region of the partition filter 300a transmits blue light and reflects red. Light and green, the secondary coating area is coated with a film that reflects blue, red and green light. According to the coating condition of the partition filter 300a, the excitation light source, the reduction beam unit, the partition filter, and the first lens optical path center are in a straight line.

The blue excitation light source emits a blue laser light, and is contracted by the ablation unit to reach the first-stage splitting area of the partition filter 300a. The first-stage splitting area is a color separation film plated on the partition filter or glued in the partition. a dichroic filter on the filter that transmits the blue laser to the primary lens, the primary lens converges the blue laser to the wavelength conversion unit, and when the blue laser contacts the reflective diffusion of the wavelength conversion unit, The blue laser is angularly diffused and reflected to the primary lens. The primary lens refracts the blue laser to the secondary coating zone of the zoned filter 300a according to its light intensity distribution characteristic, and the secondary coating filter is plated with blue light. a red and green film that reflects the blue laser; when the blue laser contacts the red or green fluorescent region of the wavelength conversion unit, red or green light is generated and reflected to the primary lens through the primary lens The refracted to the secondary coating zone and the primary beam splitting zone are reflected.

Embodiment 3

FIG. 7 is a schematic view showing the structure of the light source of the present embodiment. The main difference from the first embodiment is that the projection laser source of the embodiment further includes a second red light source 600, and the second red light source 600 is a red LED light source or a red color. a laser light source, the emitted light of the second red light source 600 is finally reflected or transmitted through the partition filter, and is merged with the light that is finally reflected or transmitted by the blue laser light source through the partition filter 300b; the projection laser light source further includes The secondary lens 601 is located between the partition filter and the second red light source 600 to converge or diverge the outgoing light from the second red light source 600.

In this embodiment, the secondary lens 601 is placed in front of the second red light source 600 optical path, the second red light source 600 is red laser light or red LED light, and the light source 600 is parallel to the outgoing light of the blue excitation light source, and the light source 600 is The light reflected by the partition filter and the blue excitation light source are parallel to the emitted light after being transmitted through the partition filter, and the second light source 600 is placed on the light exiting side of the wavelength conversion unit 101.

The distribution of the wavelength conversion unit 101 is as shown in FIG. 8 , and includes a reflective diffusion sheet 111 , and the excitation region is a green fluorescent region 121 .

Wherein, the primary beam splitting region of the partition filter 300b transmits green light to reflect red light and blue light, and the second coating region is plated with a film that transmits green light and blue light to reflect red light.

In this embodiment, the blue excitation light source emits a blue laser light, and is contracted by the reduction unit to reach the first-order splitting region of the partition filter 300b. The first-stage splitting region is the color separation plated on the partition filter 300b. The film or a color separation filter glued on the partition filter 300b reflects the blue laser light to the primary lens, the primary lens concentrates the blue laser light to the wavelength conversion unit 101, and when the blue laser contacts the wavelength conversion unit In the reflective diffuser of 101, the blue laser is angularly diffused and reflected to the primary lens, and the primary lens refracts the blue laser to the secondary coating zone of the partitioned filter 300b according to its light intensity distribution characteristic, The coating filter is plated with a film that transmits green light and blue light to reflect red light, and transmits the blue laser light; when the blue laser light contacts the green fluorescent region of the wavelength conversion unit 101, green light is generated and reflected to the primary lens. The primary lens is refracted to the secondary coating zone and the primary beam splitting zone is transmitted.

The second red light source 600 emits a red light beam, and the red light beam is incident on the secondary lens 601. The secondary lens 601 diffracts the red light to the secondary coating zone and the primary beam splitting zone of the zoned filter 300b to reflect the red light.

The red light beam emitted from the partition filter 300b is combined with the blue laser light and the green light.

Embodiment 4

FIG. 9 is a schematic view showing the structure of the light source of the embodiment. The main difference from the third embodiment is that the central light emitted by the second light source 600a and the light emitted by the first light source are reflected by the partition filter 303 and then emitted. The center rays are parallel.

Wherein, the primary spectroscopic region of the partition filter 303 reflects green light to transmit red light and blue light, and the second coating region is plated with a film that reflects green light and blue light transmits red light.

In this embodiment, the blue excitation light source emits a blue laser light, and is contracted by the narrowing unit to reach the first-stage splitting area of the partition filter 303. The first-stage splitting area is the color separation plated on the partition filter 303. The film or a dichroic filter glued to the partition filter 303 transmits the blue laser to the primary lens, the primary lens converges the blue laser to the wavelength conversion unit, and when the blue laser contacts the wavelength conversion unit In the reflective diffuser, the blue laser is angularly diffused and reflected to the primary lens, and the primary lens refracts the blue laser to the secondary coating zone of the partition filter 303 according to its light intensity distribution characteristic, and the secondary coating filter The light sheet is plated with a film that reflects green light and blue light to transmit red light, and reflects the blue laser light; when the blue laser light contacts the green fluorescent region of the wavelength conversion unit, green light is generated and reflected to the primary lens through the primary lens. The refracted to the secondary coating zone and the primary beam splitting zone are reflected.

The second red light source 600a emits a red light beam, and the red light beam is incident on the secondary lens. The secondary lens diffracts the red light to the secondary coating zone and the primary splitting zone of the partition filter 303 to transmit the red light.

The red light beam emitted from the partition filter 303 is combined with the blue laser light and the green light.

Embodiment 5

FIG. 10 is a schematic diagram showing the structure of the light source of the embodiment. The main difference from the first embodiment is that the second light source 602 and the second lens 603 are added to the backlight side of the wavelength conversion unit 102. The second lens 603 is disposed between the second light source 602 and the wavelength conversion unit 102, and the central light emitted by the second light source 602 and the light beam reflected by the first light source through the partition filter are disposed. The center of the light is parallel.

The distribution of the wavelength conversion unit 102 is as shown in FIG. 11. The diffusion sheet includes a reflective diffusion sheet 112 and a transmissive diffusion sheet 132, and the excitation region includes a green fluorescent region 122.

The blue excitation light source emits a blue laser, which is contracted by the ablation unit to reach the primary beam splitting zone of the partition filter. The primary splitting zone is a dichroic film plated on the partition filter or glued to the partition filter. a color separation filter on the light sheet, which reflects the blue laser light to the primary lens, the primary lens concentrates the blue laser light to the wavelength conversion unit 102, and when the blue laser light contacts the reflective diffusion sheet of the wavelength conversion unit 102, The blue laser is angularly diffused and reflected to the primary lens. The primary lens refracts the blue laser to the secondary coating zone of the partition filter according to its light intensity distribution characteristic, and the secondary coating filter is plated with blue light. The green light and the red light film transmit the blue laser light; when the blue laser light contacts the green fluorescent region 122 of the wavelength conversion unit 102, the green light is generated and reflected to the primary lens, and is refracted to the secondary coating through the primary lens. The zone and the primary splitting zone are transmitted out.

The second red light source 602 emits a red light beam, the red light beam is incident on the secondary lens 603, the secondary lens 603 converges the red light to the wavelength conversion unit 102, and when the red light beam contacts the transmissive diffusing film 132 of the wavelength conversion unit 102, the red light is red. The light is transmitted out and then refracted by the primary lens of the partition filter to be transmitted to the secondary coating zone and the primary beam splitting zone.

The red light beam emitted by the partition filter is combined with the blue laser and the green light.

Embodiment 6

FIG. 12 is a schematic view showing the structure of the light source of the present embodiment. The main difference from the fifth embodiment is that the center light of the second light source 602a of the present embodiment is perpendicular to the center light of the light beam reflected by the partition filter 304. The second light source 602a is parallel to the exit light of the blue excitation light source, and the light reflected by the second light source 602a through the partition filter is perpendicular to the light emitted by the blue excitation light source.

Wherein, the primary splitting region of the partition filter 304 transmits blue light, reflects red and green light, and the secondary coated region is coated with a film that reflects blue light, red light, and green light.

The blue excitation light source emits a blue laser, which is contracted by the ablation unit to reach the primary beam splitting zone of the partition filter. The primary splitting zone is a dichroic film plated on the partition filter or glued to the partition filter. Color separation filter on the light sheet, blue The laser is transmitted to the primary lens, and the primary lens converges the blue laser to the wavelength conversion unit. When the blue laser contacts the reflective diffusion of the wavelength conversion unit, the blue laser is angularly diffused and reflected to the primary lens. The grade lens refracts the blue laser light to the secondary coating zone of the partition filter according to its light intensity distribution characteristic, and the secondary coating filter is plated with a film reflecting blue light, red light and green light, and reflects the blue laser light; When the blue laser light contacts the green fluorescent region of the wavelength conversion unit, green light is generated and reflected to the primary lens, which is refracted by the primary lens to the secondary coating region and the primary spectral region to be reflected.

The second red light source 602a emits a red light beam, the red light beam is incident on the secondary lens, the secondary lens converges the red light to the wavelength conversion unit, and when the red light beam contacts the transmissive diffusing film of the wavelength conversion unit, the red light is transmitted through the The primary lens is refracted to the secondary coating zone and the primary beam splitting zone is reflected off.

The blue laser reflected by the partition filter, the green light and the red light are combined and emitted.

Example 7

FIG. 13 is a schematic structural view of a light source according to the embodiment. The main difference from the first embodiment is that the embodiment further includes a color that can rotate around the central axis, and has a blue light transmitting region, a green filter region, and a red filter region. The wheel 604 and the tertiary lens 605; the excitation region of the wavelength conversion unit includes a yellow fluorescent 133 and a green fluorescent region 123, and the color wheel 604 is disposed in the direction of the outgoing light path of the partition filter, the tertiary lens 605 Between the color wheel 604 and the partition filter, for condensing the outgoing light of the partition filter and concentrating the concentrated light beam into different filter regions of the color wheel;

In this embodiment, the color wheel 604 is placed in the light exiting direction of the blue excitation light source through the secondary coating area of the partition filter 305, and the third lens 605 is placed on the partition filter 305 and the color wheel 604. The light from the partition filter 305 is concentrated on the color wheel 604.

Wherein, the distribution of the color wheel 604 includes a blue light transmitting region 614, a green filter region 624, and a red filter region 634 as shown in FIG. 14; the color wheel 604 is disposed such that the stray light beam from the partition filter 305 is in green The color region and the yellow color region are reflected and removed after passing through the green filter region 624 and the red filter region 634.

The distribution of the wavelength conversion unit 103 is as shown in FIG. 15, including a diffusion sheet 113, and an excitation region; wherein the excitation region includes a yellow fluorescent 133 and a green fluorescent region 123.

Wherein, the primary spectroscopic region of the partition filter 305 reflects a blue light transmitting yellow and green light, and the second coating region is coated with a film that transmits blue light, green light, and yellow light.

The blue excitation light source emits a blue laser light, and is contracted by the reduction unit to reach the first-stage splitting area of the partition filter 305. The first-stage splitting area is a color separation film plated on the partition filter or glued in the partition. a color separation filter on the filter that reflects the blue laser light to the primary lens, the primary lens condenses the blue laser light to the wavelength conversion unit 103, and when the blue laser light contacts the diffusion sheet 113 of the wavelength conversion unit 103, The blue laser is angularly diffused and reflected to the primary lens. The primary lens refracts the blue laser to the secondary coating zone of the partition filter 305 according to its light intensity distribution characteristic, and the secondary coating filter is plated with the transmitted blue light. a film of green light and yellow light that transmits the blue laser light; when the blue laser light contacts the yellow fluorescent or green fluorescent region of the wavelength conversion unit 103, yellow or green light is generated and reflected to the primary lens, after one stage The lens is refracted to the secondary coating zone and the primary beam splitting zone is transmitted.

The blue laser light emitted by the partition filter, the yellow light and the green light combined light are incident on the third lens 605 and condensed onto the color wheel 604. The concentrated beam passes through the different filter regions incident on the color wheel 604 to remove stray light.

Example eight

FIG. 16 is a schematic view showing the structure of the light source of the embodiment. The main difference from the seventh embodiment is that the first-stage splitting region of the partition filter 306 of the present embodiment is coated with a film that reflects yellow light and green light and transmits blue light. The coating area is coated with a film that reflects yellow, blue, and green light. The color wheel 605 is placed in the light exiting direction of the blue excitation light source after being reflected by the secondary coating area of the partition filter 306, and the third lens is placed between the partition filter 306 and the color wheel, and will be separated from the partition filter. The light from the light sheet 306 is concentrated on the color wheel.

The blue excitation light source emits a blue laser light, and is contracted by the ablation unit to reach the first-order splitting region of the partition filter 306. The first-level splitting region is a color separation film plated on the partition filter or glued in the partition. The color separation filter on the filter will The blue laser is transmitted to the primary lens, and the primary lens converges the blue laser to the wavelength conversion unit. When the blue laser contacts the diffusion of the wavelength conversion unit, the blue laser is angularly diffused and reflected to the primary lens. The primary lens refracts the blue laser to the secondary coating zone of the partition filter according to its light intensity distribution characteristic, and the secondary coating filter is plated with a film that transmits blue light, green light, and yellow light, and reflects the blue laser light. When the blue laser contacts the yellow fluorescent or green fluorescent region of the wavelength conversion unit, yellow or green light is generated and reflected to the primary lens, which is refracted by the primary lens to the secondary coating region and the primary spectral region to be reflected.

The blue laser light emitted by the partition filter is incident on the third lens and concentrated on the color wheel. The concentrated beam is removed by incident on different filter regions of the color wheel.

In this embodiment, according to the coating relationship of the partition filter 306, the positions of the corresponding excitation light source and the primary lens follow changes.

In the embodiment of the present invention, it is not limited to the specific structural arrangement of the above embodiment, and the setting of one or more components may be increased or decreased according to actual conditions (for example, the reduction beam unit is not provided, and the blue laser light source is changed to concentrate light. The light source emitted by the method; however, if high brightness is to be achieved, it is preferable to set the reduction unit because a plurality of blue lasers are required as the excitation light source, and the incident laser beam is a multi-beam blue laser beam, which needs to be reduced in beam processing to be fully incident. To the primary splitting zone), or to change the position of one or more components (such as changing the relative position of the blue laser source to the partition filter and the wavelength conversion unit, while adjusting the ribbon settings of the partition filter and the wavelength conversion unit) ).

In the embodiment of the present invention, the optical path is changed by the partition filter having the first-stage splitting area and the second coating area, and the light is utilized by the diffusion sheet with the annular angle distribution and the primary lens with the convergence collimation function. Rate, thereby eliminating the blue light relay optical path, simplifying the light source structure, reducing the volume of the light source, and processing is simple and easy to achieve. The partitioning of the partitioning filter is not limited to the setting of two partitions as described in the embodiment, and a plurality of partitions may be set according to actual conditions, and the location of each partition is not limited to the embodiment of the present invention, for example, the primary splitting area. It can also be set in the center position, can be set in other locations according to the actual situation, and so on.

The above is a further detailed description of the present invention in connection with the preferred technical solutions, and the specific embodiments of the invention are not limited to the description. A person skilled in the art can make a simple derivation and replacement without departing from the inventive concept, and should be regarded as the protection scope of the present invention.

Claims (13)

A projection laser source comprising: a blue laser source that provides blue excitation light; The contraction unit is located on the light path of the blue excitation light source, and the blue excitation light is subjected to a shrinkage treatment; a partition filter comprising two or more partitions, each of the partitions being arranged to reflect or transmit different colored lights for changing the optical path direction of different colored lights; a primary lens positioned between the partition filter and the wavelength conversion unit to converge the blue excitation light from the partition filter to collimate the light beam from the wavelength conversion unit; a wavelength conversion unit comprising a diffusion sheet and an excitation region, the wavelength conversion unit being arranged to be rotatable about a central axis, and rotating the light beam incident thereon in turn repeatedly in contact with the diffusion sheet or the excitation region; among them, The surface of the diffusion plate of the wavelength conversion unit is coated with a blue anti-reflection film. When the blue excitation beam reaches the diffusion sheet, the diffusion sheet is angularly diffused and reflected, and enters the primary lens, and the output light intensity distribution is a circular color light. The circular area has a lower light intensity than the outer annular area; The excitation region of the wavelength conversion unit includes one or more fluorescent regions of colored light that excite the corresponding colored light and reflect when the blue excitation beam is incident on the excitation region. The projection laser source according to claim 1, wherein the partition of the partition filter comprises a first-stage splitting region and a second coating region, wherein the first-stage splitting region performs an incident blue excitation light source. Reflected or transmitted, the primary splitting zone is located in the central region of the zoned filter. The projection laser light source according to claim 2, wherein the first-stage splitting region of the partition filter is a color separation film plated on the partition filter or glued to the partition filter. The upper dichroic filter is a coating region disposed on the partition filter surrounding the primary spectroscopic region. A projection laser source according to claim 1, wherein the excitation region of said wavelength conversion unit comprises a red fluorescent region and a green fluorescent region. The projection laser source according to claim 1, wherein the projection laser source further comprises a second red light source, the second red light source is a red led light source or a red laser light source, and the second red light source The exiting light is ultimately reflected or transmitted through the zoned filter and merges with the light that is ultimately reflected or transmitted by the blue laser source through the zoned filter. The projection laser light source according to claim 5, wherein the projection laser source further comprises a secondary lens; the secondary lens is located between the partition filter and the second red light source, The emitted light of the two red light sources converge or diverge. A projection laser source according to claim 6, wherein the excitation region of said wavelength conversion unit comprises a green fluorescent region. A projection laser light source according to claim 7, wherein the primary beam splitting region of the partition filter reflects the green light beam to transmit the red light beam and the blue light beam, and the second coating region reflects the green light beam and the blue light beam. Transmit red light beam. A projection laser source according to claim 7, wherein the primary beam splitting region of the partition filter transmits a green light beam to reflect a red light beam and a blue light beam, and the second coating region transmits a green light beam and a blue light. The beam reflects the red light beam. A projection laser light source according to claim 4 or 7, wherein the first-stage splitting region of the partition filter reflects a blue light beam, and transmits a red light beam and a green light beam; The membrane is transmitted through a blue light beam, a red light beam, and a green light beam. A projection laser light source according to claim 4 or 7, wherein the primary beam splitting region of the partition filter transmits a blue light beam, reflects a red light beam and a green light beam, and the second coating region is plated with a reflection. Blue, red and green films. A projection laser source according to claim 1, further comprising a color wheel and a tertiary lens having a blue light transmitting region, a green filter region and a red filter region which are rotatable about a central axis; The color wheel is disposed in a direction of an outgoing light path of the partition filter, and the tertiary lens is disposed between the color wheel and the partition filter for concentrating the outgoing light of the partition filter and The concentrated beam is incident on different filter regions of the color wheel; The excitation region of the wavelength conversion unit includes a yellow fluorescent region and a green fluorescent region; The color wheel is used to cause stray light from the partition filter to be reflected and removed after being incident on the green filter region and the red filter region. The projection laser light source according to claim 1, wherein the blue excitation light beam is diffused by the diffusion sheet and reflected into the primary lens output circularly distributed color light, and the light intensity distribution of the circularly distributed color light has a low valley region. And the length of the trough area is greater than or equal to the projection length of the longer side length of the first-order spectroscopic area of the partition filter in the light intensity section.

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