WO2022007700A1

WO2022007700A1 - Light source apparatus and projection device

Info

Publication number: WO2022007700A1
Application number: PCT/CN2021/103968
Authority: WO
Inventors: 杨炳柯; 王则钦; 郭祖强; 李屹
Original assignee: 深圳光峰科技股份有限公司
Priority date: 2020-07-10
Filing date: 2021-07-01
Publication date: 2022-01-13
Also published as: CN113917778A

Abstract

The present invention provides a light source apparatus, comprising: a laser light source; a light splitting/combining unit; and a wavelength conversion unit, comprising a wavelength conversion area and a non-wavelength conversion area, wherein if the wavelength conversion area is located on a light path of exciting light, a part of the exciting light is wavelength-converted to form excited light and the remaining exciting light becomes residual light and is reflected, together with the excited light, from the wavelength conversion area to the light splitting/combining unit; the exciting light forms primary color light in the non-wavelength conversion area and is emitted to the light splitting/combining unit; and the non-wavelength conversion area comprises a light path shifting module for making a light path in which the primary color light is emitted to the light splitting/combining unit not overlap with a light path in which the residual light is emitted to the light splitting/combining unit; and a light concentrating unit, comprising a light concentrating area and a light filtering area, wherein the excited light and the primary color light are guided to the light concentrating area by the light splitting/combining unit so as to enter a subsequent light path, and the residual light is guided to the light filtering area by the light splitting/combining unit so as to be filtered. Therefore, the differentiation and filtering of primary color light and residual light are implemented. The present invention also provides a projection device.

Description

A light source device and projection equipment

technical field

The present invention relates to the technical field of laser projection light sources, in particular to a light source device and projection equipment.

Background technique

In recent years, the design of laser projection equipment is constantly developing towards miniaturization and high brightness. At present, laser projection equipment is generally equipped with a fluorescent laser light source, an optical system and a spatial light modulator, and laser projection is realized through the cooperation of the three. Among them, the fluorescent laser light source generally includes a fluorescent wheel device and a color correction wheel device. In some light source designs, the two devices are placed on two motors (wheels), and in some light source designs, the two devices are placed on one motor (wheel). For the fluorescent laser light source in which the fluorescent wheel device and the color correction wheel device are arranged on one motor, the size of the light source is often limited by the diameter of the color wheel in the color correction wheel device, and it is difficult to make it smaller. Therefore, in order to further realize the miniaturization of laser projection equipment, it is necessary to consider the light source solution without color correction film. Usually, the fluorescent laser light source in the laser projection equipment emits excitation light, and the fluorescence generated by the excitation light will be accompanied by some residual light that is not absorbed and converted by the fluorescent powder. This part of the residual light mixed with the fluorescence will seriously affect the fluorescence as the primary color light. Therefore, an important purpose of using the color correction film is to filter out this part of the residual light. Then, for the fluorescent laser light source of the laser projection device without color correction film, how to distinguish the primary color light from the residual light in the fluorescence, so as to further filter the residual light in the fluorescence, is an urgent problem for those skilled in the art to be solved.

SUMMARY OF THE INVENTION

The purpose of the embodiments of the present invention is to provide a light source device and a projection device, which can distinguish between primary color light and residual light in fluorescence, so as to filter the residual light and realize a simplified structure.

In order to solve the above technical problems, the present invention provides a light source device, comprising:

a laser light source for emitting excitation light;

a light splitting unit, which is used to guide the direction of the light path;

a wavelength conversion unit, which includes a wavelength conversion area and a non-wavelength conversion area that are sequentially positioned on the optical path of the excitation light;

When the wavelength conversion region is located on the excitation light optical path, part of the excitation light undergoes wavelength conversion in the wavelength conversion region to form a received laser light, and the rest of the excitation light becomes residual light and is emitted from the received laser light together with the received laser light. the wavelength conversion region is reflected toward the light splitting and combining unit;

When the non-wavelength conversion area is located on the optical path of the excitation light, the excitation light forms primary color light in the non-wavelength conversion area and is directed to the light splitting and combining unit, and the non-wavelength conversion area includes an optical path polarizer. A shifting module, the optical path shifting module is configured to perform optical path shifting for the excitation light incident in the non-wavelength conversion region, so that the primary color light is directed toward the light splitting unit and the residual light path The light paths of the light emitting to the light splitting and combining unit are not coincident;

a light collecting unit, which is arranged after the light splitting and combining unit along the light emitting direction of the received laser light, the residual light and the primary color light, the light collecting unit includes a light collecting area and a light filtering area, the The received laser light and the primary color light are guided to the light collecting area through the light splitting and combining unit to enter the subsequent optical path, and the residual light is guided to the filtering area through the light splitting and combining unit to be filtered out.

Preferably, it further includes a first condensing lens, along the incident direction of the excitation light, the light splitting and combining unit, the first condensing lens and the wavelength conversion unit are arranged in sequence, and the excitation light passes through the splitting unit in sequence. The light combining unit and the first condensing lens reach the wavelength conversion unit, and the formed received laser light, the residual light and the primary color light respectively pass through the first condensing lens and the light splitting and combining unit in sequence and then are emitted toward the wavelength conversion unit. the light collecting unit. 3. The light source device according to claim 2, wherein the light splitting and combining unit comprises a first reflection unit and a dichroic element that transmits the excitation light and reflects the received laser light, wherein the first reflection unit The optical axis of a condenser lens coincides with the optical axis of the dichroic element, the received laser light is reflected to the light collecting area of the light collecting unit through the dichroic element, and the primary color light is transmitted through the The dichroic element is then reflected to the light collecting area of the light collecting unit through the first reflection unit, and the residual light is transmitted through the dichroic element and then reflected to the light collecting unit through the first reflection unit The filter area of the unit.

Preferably, the optical path shifting module includes an excitation light transmission area, a second condenser lens and a second reflection unit arranged in sequence along the excitation light incident direction, when the non-wavelength conversion area is located on the excitation light optical path When the excitation light reaches the wavelength conversion unit, the excitation light that reaches the wavelength conversion unit passes through the excitation light transmission area and the second condenser lens in sequence, then reaches the second reflection unit, and is reflected by the second reflection unit and then passes through in turn The primary color light is formed after the second condenser lens and the excitation light transmission area, wherein the optical axis of the second condenser lens does not coincide with the optical axis of the first condenser lens.

Preferably, the optical path shifting module includes an excitation light transmission area and a reflection cup arranged in sequence along the excitation light incident direction, and when the non-wavelength conversion area is located on the excitation light optical path, it reaches the wavelength conversion unit The excitation light reaches the reflection cup after passing through the excitation light transmission area, and then passes through the excitation light transmission area to form the primary color light after being reflected by the reflection cup, wherein the optical axis of the reflection cup is the same as that of the reflection cup. The optical axes of the first condenser lenses do not coincide.

Preferably, the non-wavelength conversion region is formed with a light-transmitting layer close to the excitation light incident surface and a light-reflecting layer away from the excitation light-incident surface along its thickness direction, and the light-transmitting layer and the light-reflecting layer constitute a In the optical path shift module, when the non-wavelength conversion area is located on the excitation light optical path, the excitation light reaching the wavelength conversion unit passes through the light-transmitting layer and then reaches the light-reflecting layer, and passes through the light-transmitting layer. After being reflected by the light-reflecting layer, the primary color light passes through the light-transmitting layer twice to form the primary color light, wherein the incident direction of the excitation light does not coincide with the optical axis of the first condenser lens.

Preferably, the light collecting unit is a compound eye unit or a square rod unit: when it is a compound eye unit, the light collecting area is an area covered by the accommodating angle range of the compound eye unit, and the filter area is the compound eye The area outside the area covered by the accommodating angle range of the unit; when it is a square rod unit, the light collection area is the light entrance area of the square rod unit, and the filter area is the light entrance area of the square rod unit. The area outside the light entrance area.

Preferably, the wavelength conversion unit is a rotating color wheel, and the excitation light transmission area is located on the wheel body of the rotating color wheel.

Preferably, the wavelength conversion unit is a rotating color wheel, and the non-wavelength conversion area is formed on the wheel body of the rotating color wheel, wherein the light-transmitting layer has an optical surface that modulates the incident angle of the light beam, The optical surface modulates the incident angle of the light beam to expand the offset between the optical path of the primary color light going to the light splitting and combining unit and the light path of the residual light going to the light splitting and combining unit.

The present invention also provides a projection apparatus, which includes the above-mentioned light source device provided by the present invention.

Compared with the prior art, in the light source device and the projection equipment of the present invention, by arranging a wavelength conversion unit including a wavelength conversion area and a non-wavelength conversion area that are sequentially located on the optical path of the excitation light, when the wavelength conversion area is located in the excitation light. When the excitation light is on the optical path, part of the excitation light emitted by the laser light source undergoes wavelength conversion in the wavelength conversion region to form a received laser light, and the rest of the excitation light becomes residual light and is converted from the wavelength together with the received laser light. When the non-wavelength conversion area is located on the excitation light optical path, the excitation light forms primary color light in the non-wavelength conversion area and shoots toward the light splitting and combining unit, The non-wavelength conversion area includes an optical path shift module, and the optical path shift module is used to perform an optical path shift for the excitation light entering the non-wavelength conversion area, so that the primary color light is emitted toward the The optical path of the splitting and combining unit does not coincide with the optical path of the residual light going to the splitting and combining unit; the received laser light and the primary color light are guided to the light collecting area through the splitting and combining unit to enter the subsequent optical path, The residual light is guided to the filter area through the light splitting and combining unit to be filtered out, so as to realize the purpose of distinguishing the primary color light from the residual light and filtering the residual light without using a color trimmer , which not only improves the optical performance of the light source device and the projection device, but also simplifies the structure of the light source device and the projection device, which is conducive to miniaturization.

Description of drawings

One or more embodiments are exemplified by the pictures in the corresponding drawings, and these exemplifications do not constitute limitations of the embodiments, and elements with the same reference numerals in the drawings are denoted as similar elements, Unless otherwise stated, the figures in the accompanying drawings do not constitute a scale limitation.

FIG. 1 is a partial structural schematic diagram of Embodiment 1 of the light source device of the present invention;

FIG. 2 is a schematic structural diagram of the light collecting unit being a square bar unit in Embodiment 1 of the light source device of the present invention;

3 is a partial structural schematic diagram of Embodiment 2 of the light source device of the present invention;

4 is a partial structural schematic diagram of Embodiment 3 of the light source device of the present invention;

5 is a partial structural schematic diagram of Embodiment 4 of the light source device of the present invention;

FIG. 6 is a partial structural schematic diagram of Embodiment 5 of the light source device of the present invention.

detailed description

In order to make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the various embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, those of ordinary skill in the art can appreciate that, in the various embodiments of the present invention, many technical details are set forth in order for the reader to better understand the present application. However, even without these technical details and various changes and modifications based on the following embodiments, the technical solutions claimed in the present application can be realized. The following divisions of the various embodiments are for the convenience of description, and should not constitute any limitation on the specific implementation of the present invention, and the various embodiments may be combined with each other and referred to each other on the premise of not contradicting each other.

Example 1

Referring to FIG. 1 , a light source device 100 includes a laser light source 101 , a light splitting and combining unit 102 , a wavelength converting unit 103 and a light collecting unit 104 .

The laser light source 101 is used for emitting excitation light. In this embodiment, the laser light source 101 is preferably a laser whose emission wavelength is in the range of 440 nm to 470 nm.

The light splitting and combining unit 102 is used to guide the direction of the light path.

The wavelength conversion unit 103 includes a wavelength conversion area and a non-wavelength conversion area that are sequentially located on the optical path of the excitation light. In this embodiment, the wavelength conversion unit 103 is a rotating color wheel.

When the wavelength conversion region is located on the excitation light optical path, part of the excitation light undergoes wavelength conversion in the wavelength conversion region to form a received laser light, and the rest of the excitation light becomes residual light and is emitted from the received laser light together with the received laser light. The wavelength conversion region is reflected toward the light splitting and combining unit 102 .

When the non-wavelength conversion region is located on the excitation light optical path, the excitation light forms primary color light in the non-wavelength conversion region and is emitted to the light splitting and combining unit 102 . The non-wavelength conversion area includes an optical path shift module 1031, and the optical path shift module 1031 is used to perform optical path shift for the excitation light entering the non-wavelength conversion area, so that the excitation light is not converted in the wavelength. The optical path of the primary color light formed in the area to the light splitting and combining unit 102 does not overlap with the optical path of the residual light that is projected to the light splitting and combining unit 102 . Thus, the distinction between residual light and primary color light is achieved.

The light collecting unit 104 is disposed behind the light splitting and combining unit 102 along the light emitting direction of the received laser light, residual light and primary color light. The light collecting unit 104 includes a light collecting area and a filter area. The received laser light and the primary color light are guided to the light collecting area through the light splitting and combining unit 102 to enter the subsequent light path, and the residual light passes through the light splitting unit 102. The photosynthetic light unit 102 is directed to the filter area to be filtered out. Thereby, the filtering of residual light is realized.

In this embodiment, the light collecting unit 104 is a compound eye unit, the light collecting area is an area covered by the accommodating angle range of the compound eye unit, and the filter area is covered by the accommodating angle range of the compound eye unit areas outside the area.

Of course, the light collecting unit 104 is not limited to this. As shown in FIG. 2 , the light collecting unit 104 is a square bar unit. The light collecting area is the light entrance area of the square rod unit, and the filter area is the area outside the light entrance area of the square rod unit.

The above structure achieves the purpose of distinguishing the primary color light and residual light and filtering the residual light without using a color correction sheet, reducing the optical components, not only improving the optical performance of the light source device, but also simplifying the structure of the light source device. It facilitates miniaturization.

In order to increase the incident effect of the excitation light on the wavelength conversion unit 103 and the incident effect of the received laser light, residual light and primary color light on the light collection unit 104, the light source device 100 further includes a first condenser lens 105, along the incident direction of the excitation light, The light splitting unit 102 , the first condenser lens 105 and the wavelength conversion unit 103 are arranged in sequence, and the excitation light passes through the light splitting unit 102 and the first condenser lens 105 in sequence to reach the wavelength conversion unit 103 . The formed received laser light, the residual light, and the primary color light respectively pass through the first condensing lens 105 and the light splitting and combining unit 102 in sequence, and then are emitted to the light collecting unit 104 . The first condenser lens 105 preferably includes a lens group formed by a first lens 1051 and a second lens 1052, which are arranged in sequence along the incident direction of the excitation light and whose optical axes are coincident.

Specifically, in this embodiment, the optical path shifting module 1031 includes an excitation light transmission area 10311 , a second condenser lens 10312 (a positive lens in this embodiment) and a second condensing lens 10312 , which are sequentially arranged along the excitation light incident direction. Reflecting unit 10313. More preferably, the excitation light transmission area 10311 is located on the wheel body of the rotating color wheel, and the second condenser lens 10312 and the second reflection unit 10313 are arranged on the wheel body along the excitation light incident direction. rear.

When the non-wavelength conversion area is located on the excitation light path, the excitation light reaching the wavelength conversion unit 103 passes through the excitation light transmission area 10311 and the second condenser lens 10312 in sequence and then reaches the excitation light transmission area 10311 and the second condenser lens 10312. The second reflecting unit 10313 forms the primary color light after being reflected by the second reflecting unit 10313 and passing through the second condensing lens 10312 and the excitation light transmission area 10311 in sequence, wherein the second condensing light The optical axis of the lens 10312 does not coincide with the optical axis of the first condenser lens 105, so that the primary color light is reflected in an optical path different from the received laser light and the residual light.

The light splitting and combining unit 102 includes a first reflecting unit 1021 and a dichroic element 1022 that transmits the excitation light and reflects the received laser light. The optical axis of the first condenser lens 105 coincides with the optical axis of the dichroic element 1022 , and the received laser light is reflected to the light collecting area of the light collecting unit 104 through the dichroic element 1022 , used for the subsequent optical path; the primary color light passes through the dichroic element 1022 and is reflected to the light collecting area of the light collecting unit 104 through the first reflecting unit 1021 for subsequent optical paths; the residual light After passing through the dichroic element 1022, it is reflected to the filter area of the light collecting unit 104 through the first reflecting unit 1021 to realize filtering.

In this embodiment, the light source device 100 further includes a homogenizing device 106 to improve the uniformity of the incident excitation light. Along the incident direction of the excitation light, the laser light source 101 , the uniform light device 106 , the light splitting and combining unit 102 , the first condenser lens 105 and the wavelength conversion unit 103 are arranged in sequence.

Of course, a relay lens 110 may also be disposed between the dichroic element 1022 and the light collecting unit 104 along the optical path of the excitation light, as shown in FIG. 2 .

The working principle of the light source device 100 is as follows:

The excitation light emitted by the laser light source 101 is homogenized by the homogenizing device 106 , transmitted through the dichroic element 1022 , and reaches the wavelength conversion unit 103 through the first lens 1051 and the second lens 1052 of the first condenser lens 105 . For a common single-chip spatial light modulator optomechanical system, the wavelength conversion unit 103 takes a rotating color wheel as an example, and the rotating color wheel is divided into RGB (red, green, blue), RGBY (red, green, blue and yellow) or RGBW (red, green, blue and yellow) green, blue and white) etc. This embodiment takes the RGB 3-segment rotating color wheel as an example. When the rotating color wheel is in the R (red) and G (green) segments, the wavelength conversion area of the wavelength conversion unit 103 is located on the optical path and illuminates the rotating color wheel. The blue excitation light above will excite fluorescence (received by laser light), and the fluorescence is collected by the second lens 1052 and the first lens 1051, and then reflected by the dichroic element 1022 to the condensing unit 104; when the rotating color wheel is in the B (blue) segment , that is, the non-wavelength conversion area of the wavelength conversion unit 103 is located on the optical path, that is, the (blue) primary color light will be transmitted in the B segment, pass through the second condenser lens 10312, and then reach the second reflection unit 10313 and be reflected by the second Cell 10313 reflects back to the rotating color wheel again. The optical axis of the second condenser lens 10312 does not coincide with the optical axis of the first condenser lens 105 (the optical axes of the first lens 1051 and the second lens 1052 coincide), so the light beam passes through the second condenser lens 10312 twice There will be dislocation, that is, a "V"-shaped optical path has been passed. In this way, when the light beam of the (blue) primary color light passes through the rotating color wheel 106 again, the position of the light spot will have a certain offset from the position of the first light spot, and the offset will cause the light beam of the (blue) primary color light to pass through the The optical axis behind the second lens 1052 and the first lens 1051 is inclined (compared to the optical axis of the laser beam). The light beam of the (blue) primary color light is reflected by the first reflecting unit 1021 (the first reflecting unit 1021 is set to be placed at an angle not equal to 45°), and then reaches the light collecting unit 104 through the dichroic element 1022. The light unit 104 is a compound eye unit.

When the (blue) excitation light excites fluorescence (ie, received laser light), the unabsorbed blue light (ie, residual light) will pass through the second lens 1052 and the first lens 1051 together with the fluorescence to reach the dichroic element 1022 . Due to the difference in wavelength, the unabsorbed blue light (residual light) will be transmitted through the dichroic element 1022 , wherein part of the residual light will be reflected by the first reflection unit 1021 , and the remaining part of the residual light will be reflected by each module in the light source device 100 (including structural parts) absorption.

The present invention utilizes that the (blue) primary color light passes through the second condenser lens 10312 and the second reflection unit 10313, and the position of the light emitted from the rotating color wheel is different from the position of the fluorescent spot (residual light spot) from the second lens 1052. , The beam angles emitted by the first lens 1051 are different, so as to realize the distinction between the (blue) primary color light and the residual light. Due to the different angles of the two, after being reflected by the first reflecting unit 1021, the residual light will enter the light collecting unit 104 at a larger oblique angle, while the (blue) primary color light is normally incident or enters the light collecting unit at a smaller oblique angle 104 (ie compound eye unit 104). The compound eye unit 104 has requirements for the angle of the incident light, and the incident light within the accommodating angle range can pass through the rear optical system (not shown) after passing through the compound eye unit 104. When irradiated on the spatial light modulator, the incident light beyond its accommodating range will become side lobes, which will be lost when passing through the rear optical system, and cannot be emitted from the optical system. Using this characteristic, as long as the incident angle of the (blue) primary color light reflected by the first reflecting unit 1021 is within the accommodating range of the compound eye unit 104 and the incident angle of the residual light is outside the accommodating range of the compound eye unit 104, the (blue) primary color can be realized The distinction between light and residual light facilitates subsequent filtering of residual light.

Embodiment 2

The second embodiment of the present invention is basically the same as the above-mentioned first embodiment, and the difference lies in that the structure of the optical path shift module is different, and the details are as follows:

3, in the light source device 300, in the non-wavelength conversion area of the wavelength conversion unit 303, the optical path shift module 3031 includes an excitation light transmission area 30311 and a reflection cup 30312 arranged in sequence along the excitation light incident direction. More preferably, in this embodiment, the wavelength conversion unit 303 is a rotating color wheel, and the reflecting cup 30312 is disposed behind the wheel body of the rotating color wheel along the incident direction of the excitation light.

When the non-wavelength conversion area is located on the excitation light path, the excitation light reaching the wavelength conversion unit 303 passes through the excitation light transmission area 30311 and then reaches the reflection cup 30312 , and passes through the reflection cup 30312 After reflection, the primary color light is formed through the excitation light transmission region 30311. Wherein, the optical axis of the reflector cup 30312 does not coincide with the optical axis of the first condenser lens 305 (the optical axis of the second lens 3052 and the first lens 3051 are coincident), so that the primary color light is different from the received laser and residual The light path of the light is reflected. In this embodiment, the light collecting unit 304 is a compound eye unit.

Except for the above differences, other structures and principles are the same as those in the first embodiment, and are not repeated here.

Embodiment 3

The third embodiment of the present invention is basically the same as the above-mentioned first embodiment, and the difference lies in that the structure of the optical path shift module is different, and the details are as follows:

Referring to FIG. 4 , in the light source device 400 , the non-wavelength conversion area of the wavelength conversion unit 403 is formed with a light-transmitting layer 40312 close to the excitation light incident surface along its thickness direction and a light transmission layer 40312 away from the excitation light incident surface. The light-reflecting layer 40313 , the light-transmitting layer 40312 and the light-reflecting layer 40313 constitute the light path shifting module 4031 . When the non-wavelength conversion region is located on the excitation light path, the excitation light reaching the wavelength conversion unit 403 passes through the light-transmitting layer 40312 and then reaches the light-reflecting layer 40313 , and passes through the light-reflecting layer 40313 After reflection, it passes through the light-transmitting layer 40312 twice to form the primary color light, wherein the incident direction of the excitation light does not coincide with the optical axis of the first condensing lens, so that the excitation light is inclined at an oblique angle. incident to the wavelength conversion unit 403 .

When the wavelength conversion region is located on the excitation light optical path, part of the excitation light is directly reflected on the surface of the wavelength conversion region to form residual light, which is different from the case where the excitation light is located in the non-wavelength conversion region On the optical path, through the structural design of the light-transmitting layer 40312 and the light-reflecting layer 40313, the optical path of the excitation light that forms the primary color light is different from the optical path of the excitation light that forms the residual light. The light is incident on the wavelength conversion unit 403 in an oblique manner, so that the optical path of the primary color light to the light splitting and combining unit does not coincide with the optical path of the residual light going to the light splitting and combining unit.

In this embodiment, the wavelength conversion unit 403 is a rotating color wheel, and the non-wavelength conversion region is formed on the wheel body of the rotating color wheel. Preferably, the light-transmitting layer 40312 can have an optical surface that modulates the incident angle of the light beam by means of coating or designing a microstructure, and the optical surface can expand the direction of the primary color light by modulating the incident angle of the light beam. The offset between the optical path of the light splitting and combining unit 402 (the dichroic element 4022 and the first reflecting unit 4021 ) and the light path of the residual light emitting to the light splitting and combining unit 402 .

For example, the light-transmitting layer 40312 can be set to Gaussian scattering, so that the primary color light is scattered at a larger angle after passing through the light-transmitting layer 40312 twice. When the primary color light passes through the first condenser lens 405 (the second lens 4052 , the first lens 4051), the cross-sectional area of the light beam of the primary color will be relatively large, and then pass through the dichroic element 4022 to reach the first reflection unit 4021 and be reflected into the light collecting unit 404. The purpose of scattering the light beam of the primary color light is to enter the light collecting unit 404 with a larger cross section, so as to obtain a better uniform light effect.

Of course, according to different design requirements, the light-transmitting layer 40312 may not be specially treated, and only the optical path of the primary color light to the light splitting unit and the residual light can be made through the difference of the above-mentioned optical path. The optical paths to the light splitting unit do not overlap.

Embodiment 4

The fourth embodiment of the present invention is basically the same as the above-mentioned first embodiment, and the difference is that the structure of the first reflection unit in the light splitting and combining unit in the fourth embodiment is different from that of the first embodiment, and the details are as follows:

Please refer to FIG. 5 , in the light splitting and combining unit 502 of the light source device 500 , along the light emitting directions of the received laser light, the residual light and the primary color light, the first reflection unit 5021 includes a dichroic element arranged in sequence. After 5022, the first mirror 50211, the third lens 50212, the second mirror 50213, the third mirror 50214, and the fourth lens 50215.

After the primary color light passes through the second condenser lens 50312 and the second reflection unit 10313, it returns to the wavelength conversion unit 503 again, and then passes through the first condenser lens 505 (the second lens 5052, the first lens 5051), the dichroic element 5022 , obliquely incident on the first mirror 50211 (the first mirror 50211 is not placed at 45°). The obliquely incident primary color light passes through the first reflecting mirror 50211 and then enters the third lens 50212, then passes through the second reflecting mirror 50213, the third reflecting mirror 50214, the fourth lens 50215, and passes through the dichroic element 5022 again, and finally enters the light collection unit 504.

The blue residual light will enter the third lens 50212 and the rear light path at different angles after being reflected by the first reflecting mirror 50211 due to the different angles from the primary color light. Specifically, the residual light is reflected from the wavelength conversion unit 503 (rotating color wheel in this implementation test) and then transmitted through the dichroic element 5022 of the light splitting and combining unit 502, and the residual light is reflected by the first reflecting mirror 50211. The incident angle of the primary color light is different. After being reflected by the first mirror 50211, the residual light is transmitted in the third lens 50212, the second mirror 50213, the third mirror 50214 and the fourth lens 50215 in turn, and is gradually consumed during transmission to realize filtering. Except for residual light, it does not reach the final subsequent light path.

The structural arrangement of the first reflection unit 5021 more effectively realizes the filtering of residual light. After that, it will be gradually lost in the propagation path of the light, and will not reach the final optical modulator. The purpose of the optical path of the primary color light passing through the first reflection unit 5021 is to expand the beam through the optical path. better uniformity. In this embodiment, two positive lens groups of the third lens 50212 and the fourth lens 50215 are used to realize beam expansion. In practice, positive and negative lens groups can also be used to realize the beam expansion.

Embodiment 5

The fifth embodiment of the present invention is basically the same as the above-mentioned fourth embodiment, and the main difference is that: this fifth embodiment adds a second laser light source on the basis of the fourth embodiment, and the beam color of the second laser light source is the same as that in the fourth embodiment. The color of the beam of the laser light source is different to improve the color and improve the brightness, as follows:

Referring to FIG. 6, the light source device 600 is further provided with a second laser light source 607, a fifth lens 608, and a second dichroic disposed between the second reflecting mirror 60213 and the third reflecting mirror 60214 along the optical path of the excitation light Element 609. For example, the laser light source 601 is a yellow/blue laser, and the second laser light source 607 is a red/green laser.

After the laser light emitted by the second laser light source 607 is condensed by the fifth lens 608 (positive lens in this embodiment), it passes through the second reflecting mirror 60213 , the second dichroic element 609 , the third reflecting mirror 60214 and the fourth lens in sequence 60215, then pass through the central area of the dichroic element 6022, and then enter the light collecting unit 604. The second dichroic element 609 can homogenize the (blue) primary color light and the red/green laser light while eliminating speckle, so as to achieve the purpose of improving the color and brightness of the primary color light.

More preferably, a relay lens 610 may also be disposed between the dichroic element 6022 and the light collecting unit 604 along the optical path of the excitation light. After the laser light emitted by the second laser light source 607 is condensed by the fifth lens 608, it sequentially passes through the second reflecting mirror 60213, the second dichroic element 609, the third reflecting mirror 60214 and the fourth lens 60215, and then passes through the dichroic element 6022 , and then enter the light collecting unit 604 through the relay lens 610 .

Of course, in this embodiment, after the laser light emitted by the second laser light source 607 is condensed by the fifth lens 608 , it can also be incident on the third reflecting mirror 60214 . Alternatively, after the laser light emitted by the second laser light source 607 is condensed by the fifth lens 608, an area-coated dichroic plate can be added to the optical path between the relay lens 610 and the light collecting unit 604 to combine with the primary color light and the received laser light. Synthetic light. This is all feasible, and its function is to improve the color of the primary color light and increase its brightness.

Embodiment 6

The present invention further provides a projection apparatus, which includes the light source device provided by the present invention, and the light source device can be any one of the above-mentioned embodiments 1 to 5.

It should be noted that the terminology used herein is for the purpose of describing specific embodiments only, and is not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural as well, furthermore, it is to be understood that when the terms "comprising" and/or "including" are used in this specification, it indicates that There are features, steps, operations, devices, components and/or combinations thereof.

The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise. Meanwhile, it should be understood that, for the convenience of description, the dimensions of various parts shown in the accompanying drawings are not drawn in an actual proportional relationship. Techniques, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the authorized description. In all examples shown and discussed herein, any specific value should be construed as illustrative only and not as limiting. Accordingly, other examples of exemplary embodiments may have different values. It should be noted that like numerals and letters refer to like items in the following figures, so once an item is defined in one figure, it does not require further discussion in subsequent figures.

In the description of this application, it should be understood that the orientations indicated by the orientation words such as "front, rear, top, bottom, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" etc. Or the positional relationship is usually based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and these orientations do not indicate or imply the indicated device or element unless otherwise stated. It must have a specific orientation or be constructed and operated in a specific orientation, so it cannot be construed as a limitation on the protection scope of the application; the orientation words "inside and outside" refer to the inside and outside relative to the contour of each component itself.

For ease of description, spatially relative terms, such as "on", "over", "on the surface", "above", etc., may be used herein to describe what is shown in the figures. The spatial positional relationship of one device or feature shown to other devices or features. It should be understood that spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or features would then be oriented "below" or "over" the other devices or features under other devices or constructions". Thus, the exemplary term "above" can encompass both an orientation of "above" and "below." The device may also be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptions used herein interpreted accordingly.

In addition, it should be noted that the use of words such as "first" and "second" to define components is only for the convenience of distinguishing corresponding components. Unless otherwise stated, the above words have no special meaning and therefore cannot be understood to limit the scope of protection of this application.

Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, and substitutions can be made in these embodiments without departing from the principle and spirit of the invention and modifications, the scope of the present invention is defined by the appended claims and their equivalents

Those skilled in the art can understand that the above-mentioned embodiments are specific examples for realizing the present invention, and in practical applications, various changes in form and details can be made without departing from the spirit and the spirit of the present invention. Scope.

Claims

A light source device, characterized in that it includes:

a laser light source for emitting excitation light;

a light splitting unit, which is used to guide the direction of the light path;

a wavelength conversion unit, which includes a wavelength conversion area and a non-wavelength conversion area that are sequentially positioned on the optical path of the excitation light;

When the wavelength conversion region is located on the excitation light optical path, part of the excitation light undergoes wavelength conversion in the wavelength conversion region to form a received laser light, and the rest of the excitation light becomes residual light and is emitted from the received laser light together with the received laser light. the wavelength conversion region is reflected toward the light splitting and combining unit;

When the non-wavelength conversion area is located on the optical path of the excitation light, the excitation light forms primary color light in the non-wavelength conversion area and is directed to the light splitting and combining unit, and the non-wavelength conversion area includes an optical path polarizer. A shifting module, the optical path shifting module is configured to perform optical path shifting for the excitation light incident in the non-wavelength conversion region, so that the primary color light is directed toward the light splitting unit and the residual light path The light paths of the light emitting to the light splitting and combining unit are not coincident;

a light collecting unit, which is arranged after the light splitting and combining unit along the light emitting direction of the received laser light, the residual light and the primary color light, the light collecting unit includes a light collecting area and a light filtering area, the The received laser light and the primary color light are guided to the light collecting area through the light splitting and combining unit to enter the subsequent optical path, and the residual light is guided to the filtering area through the light splitting and combining unit to be filtered out.
The light source device according to claim 1, further comprising a first condensing lens, and along the incident direction of the excitation light, the light splitting and combining unit, the first condensing lens and the wavelength conversion unit are arranged in sequence It is arranged that the excitation light sequentially passes through the light splitting and combining unit and the first condensing lens to reach the wavelength conversion unit, and the formed received laser light, the residual light and the primary color light pass through the first light in sequence respectively. The condensing lens and the light splitting and combining unit are then directed towards the light collecting unit. 3. The light source device according to claim 2, wherein the light splitting and combining unit comprises a first reflection unit and a dichroic element that transmits the excitation light and reflects the received laser light, wherein the first reflection unit The optical axis of a condenser lens coincides with the optical axis of the dichroic element, the received laser light is reflected to the light collecting area of the light collecting unit through the dichroic element, and the primary color light is transmitted through the The dichroic element is then reflected to the light collecting area of the light collecting unit through the first reflection unit, and the residual light is transmitted through the dichroic element and then reflected to the light collecting unit through the first reflection unit The filter area of the unit.
The light source device according to claim 3, wherein the optical path shifting module comprises an excitation light transmission area, a second condenser lens and a second reflection unit arranged in sequence along the excitation light incident direction. When the non-wavelength conversion area is located on the excitation light optical path, the excitation light that reaches the wavelength conversion unit passes through the excitation light transmission area and the second condenser lens in sequence, and then reaches the second reflection unit, and then reaches the second reflection unit via the excitation light transmission area and the second condenser lens. After being reflected by the second reflecting unit, the primary color light is formed by passing through the second condensing lens and the excitation light transmission area in sequence, wherein the optical axis of the second condensing lens is the same as the first condensing lens. The optical axes of the optical lenses do not coincide.
The light source device according to claim 3, wherein the optical path shifting module comprises an excitation light transmission area and a reflection cup arranged in sequence along the excitation light incident direction, when the non-wavelength conversion area is located in the excitation light On the optical path, the excitation light that reaches the wavelength conversion unit passes through the excitation light transmission area and then reaches the reflection cup, and is reflected by the reflection cup and passes through the excitation light transmission area to form the primary color light , wherein the optical axis of the reflection cup does not coincide with the optical axis of the first condenser lens.
3. The light source device according to claim 3, wherein a light-transmitting layer close to the excitation light incident surface and a light-reflecting layer away from the excitation light incident surface are formed in the non-wavelength conversion region along the thickness direction thereof. , the light-transmitting layer and the light-reflecting layer constitute the optical path shifting module, and when the non-wavelength conversion area is located on the excitation light optical path, the excitation light reaching the wavelength conversion unit passes through the light transmission It reaches the light-reflecting layer after being reflected by the light-reflecting layer, and then passes through the light-transmitting layer twice to form the primary color light, wherein the incident direction of the excitation light is the same as the optical axis of the first condenser lens. not coincident.
The light source device according to claim 3, wherein the light collecting unit is a compound eye unit or a square rod unit: when it is a compound eye unit, the light collecting area is covered by the accommodating angle range of the compound eye unit When it is a square rod unit, the light collecting area is the light entrance area of the square rod unit, so The filter area is an area outside the light entrance area of the square rod unit.
The light source device according to claim 4 or 5, wherein the wavelength conversion unit is a rotating color wheel, and the excitation light transmission area is located on a wheel body of the rotating color wheel.
The light source device according to claim 6, wherein the wavelength conversion unit is a rotating color wheel, the non-wavelength conversion region is formed on the wheel body of the rotating color wheel, wherein the light-transmitting layer has An optical surface that modulates the incident angle of the light beam, and the optical surface modulates the incident angle of the light beam to expand the optical path of the primary color light to the light splitting unit and the residual light to the light splitting unit. The offset between the light paths of the light units.
A projection apparatus comprising the light source device according to any one of claims 1 to 9.