Light source device and projection apparatus

Abstract

The application provides a light source device, comprising a laser light source, a light splitting and combining unit, a wavelength conversion unit comprising a wavelength conversion region and a non-wavelength conversion region, when the wavelength conversion region is located on the light path of excitation light, part of the excitation light is wavelength-converted to form stimulated light, and the remaining excitation light becomes residual light and is reflected from the wavelength conversion region to the light splitting and combining unit together with the stimulated light; the excitation light forms primary color light in the non-wavelength conversion region and is emitted to the light splitting and combining unit, the non-wavelength conversion region comprises a light path offset module, which is used for making the light path of the primary color light emitted to the light splitting and combining unit not coincide with the light path of the residual light emitted to the light splitting and combining unit; and a light collecting unit comprising a light collecting region and a light filtering region, the stimulated light and the primary color light are guided to the light collecting region via the light splitting and combining unit to enter a subsequent light path, and the residual light is guided to the light filtering region via the light splitting and combining unit to be filtered out. Thus, the primary color light and the residual light are distinguished and filtered out. The application also provides a projection device.

Description

Technical Field

[0001] This invention relates to the field of laser projection light source technology, and in particular to a light source device and projection equipment. Background Technology

[0002] In recent years, the design of laser projection equipment has been continuously developing towards miniaturization and high brightness. Currently, laser projection equipment generally incorporates a fluorescent laser light source, an optical system, and a spatial light modulator, with these three components working together to achieve laser projection. The fluorescent laser light source typically includes a phosphor wheel and a color wheel. In some light source designs, these two components are mounted on two separate motors (wheels), while in others they are mounted on a single motor (wheel). For fluorescent laser light sources where the phosphor wheel and color wheel are mounted on a single motor, their size is often limited by the diameter of the color wheel in the color wheel, making it difficult to make them smaller. Therefore, further miniaturization of laser projection equipment requires considering light source solutions without color filters. Typically, the fluorescent laser light source in a laser projection device emits excitation light. The fluorescence generated by this excitation light contains residual light that is not absorbed and converted by the phosphor. This residual light mixed in with the fluorescence severely affects the color quality of the fluorescence as the primary color. Therefore, a key purpose of using color filters is to filter out this residual light. Therefore, for the fluorescent laser light source of laser projection equipment without color correction filters, how to distinguish between the primary color light and the residual light in the fluorescence in order to further filter out the residual light in the fluorescence is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0003] The purpose of this invention is to provide a light source device and a projection device that can distinguish between primary color light and residual light in fluorescence, so as to filter out the residual light and achieve a simplified structure.

[0004] To solve the above-mentioned technical problems, the present invention provides a light source device, comprising:

[0005] A laser light source, used to emit excitation light;

[0006] The light splitter and combiner unit is used to guide the direction of the light path;

[0007] A wavelength conversion unit includes a wavelength conversion region and a non-wavelength conversion region located sequentially in the optical path of the excitation light;

[0008] When the wavelength conversion region is located in the optical path of the excitation light, part of the excitation light undergoes wavelength conversion in the wavelength conversion region to form laser light, and the remaining excitation light becomes residual light and is reflected from the wavelength conversion region to the beam splitting and combining unit along with the laser light.

[0009] When the non-wavelength conversion region is located on the optical path of the excitation light, the excitation light forms primary color light in the non-wavelength conversion region and is directed toward the light splitting and combining unit. The non-wavelength conversion region includes an optical path offset module. The optical path offset module includes an excitation light transmission region, a second focusing lens, and a second reflection unit arranged sequentially along the incident direction of the excitation light. The optical path offset module is used to offset the optical path of the excitation light entering the non-wavelength conversion region so that the optical path of the primary color light toward the light splitting and combining unit does not coincide with the optical path of the residual light toward the light splitting and combining unit.

[0010] A light-collecting unit is disposed after the light-splitting and light-combining unit along the light-emitting direction of the laser beam, the residual light, and the primary color light. The light-collecting unit includes a light-collecting area and a light-filtering area. The laser beam and the primary color light are guided to the light-collecting area via the light-splitting and light-combining unit to enter the subsequent optical path, and the residual light is guided to the light-filtering area via the light-splitting and light-combining unit to be filtered out.

[0011] Preferably, it further includes a first focusing lens. Along the incident direction of the excitation light, the beam splitting and combining unit, the first focusing lens, and the wavelength conversion unit are arranged in sequence. The excitation light passes through the beam splitting and combining unit and the first focusing lens in sequence to reach the wavelength conversion unit. The laser light, the residual light, and the primary color light formed pass through the first focusing lens and the beam splitting and combining unit in sequence and are then directed toward the light collecting unit.

[0012] Preferably, the beam splitting and combining unit includes a first reflecting unit and a dichroic element that transmits the excitation light and reflects the laser beam, wherein the optical axis of the first focusing lens coincides with the optical axis of the dichroic element, the laser beam is reflected by the dichroic element to the light-collecting area of ​​the light-collecting unit, the primary color light passes through the dichroic element and is reflected by the first reflecting unit to the light-collecting area of ​​the light-collecting unit, and the residual light passes through the dichroic element and is reflected by the first reflecting unit to the filtering area of ​​the light-collecting unit.

[0013] Preferably, when the non-wavelength conversion region is located on the excitation light path, the excitation light reaching the wavelength conversion unit passes sequentially through the excitation light transmission region and the second condenser lens to reach the second reflection unit. After being reflected by the second reflection unit, it passes sequentially through the second condenser lens and the excitation light transmission region to form the primary color light. The optical axis of the second condenser lens does not coincide with the optical axis of the first condenser lens.

[0014] Preferably, the optical path offset module includes an excitation light transmission area and a reflector cup arranged sequentially along the incident direction of the excitation light. When the non-wavelength conversion area is located on the optical path of the excitation light, the excitation light reaching the wavelength conversion unit passes through the excitation light transmission area and then reaches the reflector cup. After being reflected by the reflector cup, it passes through the excitation light transmission area to form the primary color light. The optical axis of the reflector cup does not coincide with the optical axis of the first condenser lens.

[0015] Preferably, the non-wavelength conversion region has a light-transmitting layer near the excitation light incident surface and a reflective layer away from the excitation light incident surface along its thickness direction. The light-transmitting layer and the reflective layer constitute the optical path offset module. When the non-wavelength conversion region 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 reflective layer. After being reflected by the reflective layer, it passes through the light-transmitting layer a second time to form the primary color light. The incident direction of the excitation light does not coincide with the optical axis of the first condenser lens.

[0016] 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 the area covered by the accommodating angle range of the compound eye unit, and the filtering area is the area outside the accommodating angle range of the compound eye unit; when it is a square rod unit, the light-collecting area is the light-inlet area of ​​the square rod unit, and the filtering area is the area outside the light-inlet area of ​​the square rod unit.

[0017] Preferably, the wavelength conversion unit is a rotating color wheel, and the excitation light transmission region is located on the wheel body of the rotating color wheel.

[0018] Preferably, the wavelength conversion unit is a rotating color wheel, and the non-wavelength conversion region is formed on the wheel body of the rotating color wheel. 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 increase the offset between the optical path of the primary color light to the light splitting and combining unit and the optical path of the residual light to the light splitting and combining unit.

[0019] The present invention also provides a projection device, which includes the light source device described above provided by the present invention.

[0020] Compared with the prior art, the light source device and projection equipment of the present invention, by setting a wavelength conversion unit including a wavelength conversion region and a non-wavelength conversion region located sequentially on the optical path of the excitation light, when the wavelength conversion region is located on the optical path of the excitation light, part of the excitation light emitted by the laser source undergoes wavelength conversion in the wavelength conversion region to form received laser light, and the remaining excitation light becomes residual light and is reflected from the wavelength conversion region to the beam splitting and combining unit along with the received laser light; when the non-wavelength conversion region is located on the optical path of the excitation light, the excitation light forms primary color light in the non-wavelength conversion region and is directed towards the beam splitting and combining unit, and the non-wavelength conversion region includes optical path offset. The optical path offset module is used to offset the optical path of the excitation light entering the non-wavelength conversion region, so that the optical path of the primary color light to the beam splitter and combiner unit does not coincide with the optical path of the residual light to the beam splitter and combiner unit. The laser and primary color light are guided to the light collection area through the beam splitter and combiner unit to enter the subsequent optical path, and the residual light is guided to the filter area through the beam splitter and combiner unit to be filtered out. This achieves the purpose of distinguishing between primary color light and residual light and filtering out residual light without using a color correction filter. This 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, making it easier to miniaturize. Attached Figure Description

[0021] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0022] Figure 1 This is a partial structural schematic diagram of an embodiment of the light source device of the present invention;

[0023] Figure 2 This is a schematic diagram of the light-collecting unit being a square bar unit in Embodiment 1 of the light source device of the present invention;

[0024] Figure 3 This is a partial structural schematic diagram of Embodiment 2 of the light source device of the present invention;

[0025] Figure 4 This is a partial structural schematic diagram of Embodiment 3 of the light source device of the present invention;

[0026] Figure 5 This is a partial structural schematic diagram of Embodiment 4 of the light source device of the present invention;

[0027] Figure 6 This is a partial structural schematic diagram of Embodiment 5 of the light source device of the present invention. Detailed Implementation

[0028] 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 skilled in the art will understand that many technical details are presented in the various embodiments of the present invention to facilitate a better understanding of this application. However, the technical solutions claimed in this application can be implemented even without these technical details and various changes and modifications based on the following embodiments. The division of the various embodiments below is for ease of description and should not constitute any limitation on the specific implementation of the present invention. The various embodiments can be combined with and referenced by each other without contradiction.

[0029] Example 1

[0030] Please refer to Figure 1 As shown, a light source device 100 includes a laser light source 101, a light splitting and combining unit 102, a wavelength conversion unit 103, and a light collecting unit 104.

[0031] The laser source 101 is used to emit excitation light. In this embodiment, the laser source 101 is preferably a laser with an emission wavelength in the range of 440nm to 470nm.

[0032] The light splitting and combining unit 102 is used to guide the direction of the light path.

[0033] The wavelength conversion unit 103 includes a wavelength conversion region and a non-wavelength conversion region located sequentially in the optical path of the excitation light. In this embodiment, the wavelength conversion unit 103 is a rotating color wheel.

[0034] When the wavelength conversion region is located in the optical path of the excitation light, part of the excitation light undergoes wavelength conversion in the wavelength conversion region to form laser light, and the remaining excitation light becomes residual light and is reflected from the wavelength conversion region to the beam splitting and combining unit 102 along with the laser light.

[0035] When the non-wavelength conversion region is located on the optical path of the excitation light, the excitation light forms primary color light in the non-wavelength conversion region and is directed towards the light splitting and combining unit 102. The non-wavelength conversion region includes an optical path offset module 1031, which is used to offset the optical path of the excitation light entering the non-wavelength conversion region, so that the optical path of the primary color light formed by the excitation light in the non-wavelength conversion region towards the light splitting and combining unit 102 does not coincide with the optical path of the residual light towards the light splitting and combining unit 102. This achieves the distinction between residual light and primary color light.

[0036] The light-collecting unit 104 is positioned after the light-splitting and combining unit 102, along the light-emitting direction of the laser beam, residual light, and primary color light. The light-collecting unit 104 includes a light-collecting area and a filtering area. The laser beam and primary color light are guided to the light-collecting area via the light-splitting and combining unit 102 to enter the subsequent optical path, while the residual light is guided to the filtering area via the light-splitting and combining unit 102 to be filtered out. This achieves the filtering out of residual light.

[0037] In this embodiment, the light-collecting unit 104 is a compound eye unit, the light-collecting area is the area covered by the accommodating angle range of the compound eye unit, and the light-filtering area is the area outside the accommodating angle range of the compound eye unit.

[0038] Of course, the light-collecting unit 104 is not limited to this, such as Figure 2 As shown, the light-collecting unit 104 is a square rod unit. The light-collecting area is the light-inlet area of ​​the square rod unit, and the light-filtering area is the area outside the light-inlet area of ​​the square rod unit.

[0039] The above structure achieves the purpose of distinguishing primary color light from residual light and filtering out residual light without using color correction filters. It reduces the number of optical components, not only improving the optical performance of the light source device, but also simplifying the structure of the light source device, making it easier to miniaturize.

[0040] To enhance the incident effect of excitation light on wavelength conversion unit 103 and the incident effect of laser light, residual light, and primary color light on light collection unit 104, the light source device 100 further includes a first condensing lens 105. Along the incident direction of the excitation light, the beam splitting and combining unit 102, the first condensing lens 105, and the wavelength conversion unit 103 are sequentially arranged. The excitation light passes sequentially through the beam splitting and combining unit 102 and the first condensing lens 105 to reach the wavelength conversion unit 103. The resulting laser light, residual light, and primary color light pass sequentially through the first condensing lens 105 and the beam splitting and combining unit 102 before being incident on the light collection unit 104. The first condensing lens 105 preferably comprises a lens group consisting of a first lens 1051 and a second lens 1052 arranged sequentially along the incident direction of the excitation light and whose optical axes coincide.

[0041] Specifically, in this embodiment, the optical path offset module 1031 includes an excitation light transmission area 10311, a second condensing lens 10312 (a positive lens in this embodiment), and a second reflection unit 10313, arranged sequentially along the incident direction of the excitation light. More preferably, the excitation light transmission area 10311 is located on the wheel body of the rotating color wheel, and the second condensing lens 10312 and the second reflection unit 10313 are arranged behind the wheel body along the incident direction of the excitation light.

[0042] When the non-wavelength conversion region is located in the excitation light path, the excitation light reaching the wavelength conversion unit 103 passes sequentially through the excitation light transmission region 10311 and the second condenser lens 10312 before reaching the second reflection unit 10313. After being reflected by the second reflection unit 10313, it passes sequentially through the second condenser lens 10312 and the excitation light transmission region 10311 to form the primary color light. The optical axis of the second condenser lens 10312 does not coincide with the optical axis of the first condenser lens 105, so that the primary color light is reflected in a different optical path than the laser and residual light.

[0043] The beam 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 condensing lens 105 coincides with the optical axis of the dichroic element 1022. The received laser light is reflected by the dichroic element 1022 to the light-collecting area of ​​the light-collecting unit 104 for subsequent optical paths. The primary color light, after passing through the dichroic element 1022, is reflected by the first reflecting unit 1021 to the light-collecting area of ​​the light-collecting unit 104 for subsequent optical paths. The residual light, after passing through the dichroic element 1022, is reflected by the first reflecting unit 1021 to the filtering area of ​​the light-collecting unit 104 for filtering.

[0044] In this embodiment, the light source device 100 further includes a light homogenizing device 106 to improve the uniformity of the excitation light incident. Along the incident direction of the excitation light, the laser light source 101, the light homogenizing device 106, the light splitting and combining unit 102, the first condensing lens 105, and the wavelength conversion unit 103 are arranged sequentially.

[0045] Of course, a relay lens 110 can also be provided between the dichroic element 1022 and the light collecting unit 104 along the optical path of the excitation light, such as... Figure 2 As shown.

[0046] The working principle of the light source device 100 is as follows:

[0047] The laser source 101 emits excitation light, which is homogenized by the homogenizing device 106, then transmitted through the dichroic element 1022, and finally through the first lens 1051 and the second lens 1052 of the first focusing lens 105 to reach the wavelength conversion unit 103. For a common monolithic spatial light modulator optomechanical system, the wavelength conversion unit 103 is illustrated using a rotating color wheel as an example. The rotating color wheel can be divided into multiple segments such as RGB (red, green, blue), RGBY (red, green, blue, yellow), or RGBW (red, green, blue, white). This embodiment takes an RGB 3-segment rotating color wheel as an example. When the rotating color wheel is in the R (red) or G (green) segment, the wavelength conversion area of ​​the wavelength conversion unit 103 is located in the optical path. The blue excitation light illuminating the rotating color wheel will excite fluorescence (under laser light). After the fluorescence is collected by the second lens 1052 and the first lens 1051, it is reflected by the dichroic element 1022 to the focusing unit 104. When the rotating color wheel is in the B (blue) segment, the non-wavelength conversion area of ​​the wavelength conversion unit 103 is located in the optical path. That is, the (blue) primary color light will be transmitted in the B segment, and after passing through the second focusing lens 10312, it reaches the second reflection unit 10313 and is reflected by the second reflection unit 10313 back to the rotating color wheel. 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). Therefore, the light beam will be misaligned when passing through the second condenser lens 10312 twice, i.e., it will travel a "V"-shaped optical path. Thus, when the (blue) primary color light beam passes through the rotating color wheel 106 again, the spot position will be offset from the first spot position. This offset will cause the optical axis of the (blue) primary color light beam to tilt after passing through the second lens 1052 and the first lens 1051 in sequence (compared to the optical axis of the laser). After being reflected by the first reflection unit 1021 (the first reflection unit 1021 is set at an angle not equal to 45°), the (blue) primary color light beam passes through the dichroic element 1022 and reaches the light collecting unit 104. In this embodiment, the light collecting unit 104 is a compound eye unit.

[0048] When fluorescence is excited by (blue) excitation light (i.e., by laser), the unabsorbed blue light (i.e., residual light) passes through the second lens 1052 and the first lens 1051 along with the fluorescence to reach the dichroic element 1022. Due to the wavelength difference, the unabsorbed blue light (residual light) will be transmitted through the dichroic element 1022. Some of the residual light will be reflected by the first reflecting unit 1021, and the remaining residual light will be absorbed by various modules (including structural components) in the light source device 100.

[0049] This invention utilizes the difference in the angle of the light beam emitted from the second lens 1052 and the first lens 1051 after the (blue) primary color light passes through the second condenser lens 10312 and the second reflector unit 10313. This difference in the position of the emitted light from the rotating color wheel compared to the position of the fluorescent spot (residual light spot) results in different beam angles. Due to the different angles, after reflection by the first reflector unit 1021, the residual light enters the light-collecting unit 104 at a larger angle, while the (blue) primary color light is incident directly or enters the light-collecting unit 104 (i.e., the compound eye unit) at a smaller angle. The compound eye unit has requirements regarding the angle of the incident light; incident light within its accommodating angle range can pass through the rear optical system (not shown). Incident light exceeding its accommodating range, when irradiated by the spatial light modulator, becomes a side lobe and is lost when passing through the rear optical system, failing to exit. Utilizing this characteristic, as long as the incident angle of the (blue) primary color light reflected by the first reflection unit 1021 is within the range that the compound eye unit can accommodate, while the incident angle of the residual light is outside the range that the compound eye unit can accommodate, the (blue) primary color light and the residual light can be distinguished, thereby facilitating the subsequent filtering of the residual light.

[0050] Implementation Method 2

[0051] Embodiment 2 of the present invention is basically the same as Embodiment 1 above, except that the structure of the optical path offset module is different, as detailed below:

[0052] Please combine Figure 3 As shown, in the light source device 300, the optical path offset module 3031 of the wavelength conversion unit 303 in the non-wavelength conversion region includes an excitation light transmission region 30311 and a reflector cup 30312 arranged sequentially along the incident direction of the excitation light. More preferably, in this embodiment, the wavelength conversion unit 303 is a rotating color wheel, and the reflector cup 30312 is arranged behind the wheel body of the rotating color wheel along the incident direction of the excitation light.

[0053] When the non-wavelength conversion region is located in the excitation light path, the excitation light arriving at the wavelength conversion unit 303 passes through the excitation light transmission region 30311 and reaches the reflector cup 30312. After being reflected by the reflector cup 30312, it passes through the excitation light transmission region 30311 to form the primary color light. The optical axis of the reflector cup 30312 does not coincide with the optical axis of the first condenser lens 305 (the optical axes of the second lens 3052 and the first lens 3051 are coincident), so that the primary color light is reflected along a different optical path than the laser beam and residual light. In this embodiment, the light-collecting unit 304 is a compound eye unit.

[0054] Apart from the differences mentioned above, the other structures and principles are the same as in Implementation Method 1, and will not be repeated here.

[0055] Implementation Method 3

[0056] Embodiment 3 of the present invention is basically the same as Embodiment 1 above, except that the structure of the optical path offset module is different, as detailed below:

[0057] Please combine Figure 4 As shown, in the light source device 400, the non-wavelength conversion region of the wavelength conversion unit 403 has a light-transmitting layer 40312 near the light-incident surface of the excitation light and a reflective layer 40313 away from the light-incident surface of the excitation light, which together constitute the optical path offset module 4031. When the non-wavelength conversion region is located on the optical path of the excitation light, the excitation light reaching the wavelength conversion unit 403 passes through the light-transmitting layer 40312 and then reaches the reflective layer 40313. After being reflected by the reflective layer 40313, it passes through the light-transmitting layer 40312 again to form the primary color light. The incident direction of the excitation light does not coincide with the optical axis of the first condenser lens, so that the excitation light is incident on the wavelength conversion unit 403 at an angle.

[0058] When the wavelength conversion region is located on the excitation light path, part of the excitation light is directly reflected on the surface of the wavelength conversion region to form residual light. In contrast, when the non-wavelength conversion region is located on the excitation light path, the structural design of the light-transmitting layer 40312 and the reflective layer 40313 makes the optical path of the excitation light that forms the primary color light different from that of the excitation light that forms the residual light. Furthermore, because the excitation light is incident on the wavelength conversion unit 403 at an angle, 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 to the light splitting and combining unit.

[0059] 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 be made to have an optical surface that modulates the incident angle of the light beam by means of coating or designing microstructures. This optical surface modulates the incident angle of the light beam to increase the offset between the light path of the primary color light to the light-splitting and light-combining unit 402 (dichroic element 4022 and first reflection unit 4021) and the light path of the residual light to the light-splitting and light-combining unit 402.

[0060] For example, the light-transmitting layer 40312 can be configured for Gaussian scattering. This way, the primary color light is scattered at a relatively large angle after passing through the light-transmitting layer 40312 twice. When the primary color light passes through the first condensing lens 405 (second lens 4052, first lens 4051) again, the cross-sectional area of ​​the primary color light beam will be diffused to a relatively large extent. Then, it passes through the dichroic element 4022 and reaches the first reflecting unit 4021 for reflection before entering the light-collecting unit 404. The purpose of scattering the primary color light beam is to allow it to enter the light-collecting unit 404 with a larger cross-section, thereby achieving a better light uniformity effect.

[0061] Of course, depending on different design needs, the light-transmitting layer 40312 may not be specially treated. The light path of the primary color light to the light-splitting and light-combining unit may be made to be different from that of the residual light to the light-splitting and light-combining unit by simply using the above-mentioned different optical paths.

[0062] Apart from the differences mentioned above, the other structures and principles are the same as in Implementation Method 1, and will not be repeated here.

[0063] Implementation Method 4

[0064] Embodiment four of the present invention is basically the same as embodiment one described above, except that the structure of the first reflecting unit in the light splitting and combining unit of embodiment four is different from that in embodiment one, as detailed below:

[0065] Please combine Figure 5 As shown, in the beam splitting and combining unit 502 of the light source device 500, along the light emission direction of the laser, the residual light and the primary color light, the first reflection unit 5021 includes a first reflector 50211, a third lens 50212, a second reflector 50213, a third reflector 50214 and a fourth lens 50215, which are sequentially arranged after the dichroic element 5022.

[0066] The primary color light, after passing through the second condenser lens 50312 and the second reflection unit 10313, returns to the wavelength conversion unit 503. It then passes through the first condenser lens 505 (second lens 5052, first lens 5051) and the dichroic element 5022, before being obliquely incident on the first reflector 50211 (the first reflector 50211 is not placed at 45°). The obliquely incident primary color light, after passing through the first reflector 50211, is incident on the third lens 50212, then through the second reflector 50213, the third reflector 50214, and the fourth lens 50215, before passing again through the dichroic element 5022 and finally entering the light-collecting unit 504.

[0067] Because the blue residual light is at a different angle than the primary color light, it enters the third lens 50212 and the subsequent optical path at different angles after being reflected by the first reflector 50211. Specifically, the residual light is reflected from the wavelength conversion unit 503 (rotating color wheel in this embodiment) and then passes through the dichroic element 5022 of the beam splitting and combining unit 502. The residual light is reflected by the first reflector 50211, but because its angle is different from the incident angle of the primary color light, the residual light is reflected by the first reflector 50211 and then transmitted sequentially through the third lens 50212, the second reflector 50213, the third reflector 50214 and the fourth lens 50215. During transmission, it is gradually consumed, thus filtering out the residual light, and it will not reach the final subsequent optical path.

[0068] The structure of the first reflection unit 5021 more effectively filters out residual light. The residual light is gradually lost along its propagation path and will not reach the final light modulator. The purpose of the primary color light passing through the first reflection unit 5021 is to expand the beam. The expanded beam, when passing through the light collecting unit 504, can be homogenized over a larger area of ​​the light collecting unit 504, achieving better uniformity. In this embodiment, two positive lens groups, the third lens 50212 and the fourth lens 50215, are used to achieve beam expansion; however, in practice, positive and negative lens groups can also be used.

[0069] Apart from the differences mentioned above, the other structures and principles are the same as in Implementation Method 1, and will not be repeated here.

[0070] Implementation Method 5

[0071] Embodiment five of the present invention is basically the same as embodiment four above, except that: Embodiment five adds a second laser source based on embodiment four. The beam color of the second laser source is different from that of the laser source in embodiment four, in order to improve the color and increase the brightness, as follows:

[0072] Please combine Figure 6 As shown, the light source device 600 further includes a second laser light source 607, a fifth lens 608, and a second dichroic element 609 disposed between the second reflector 60213 and the third reflector 60214 along the optical path of the excitation light. For example, the laser light source 601 is a yellow / blue laser, and the second laser light source 607 is a red / green laser.

[0073] The laser emitted from the second laser source 607 is focused by the fifth lens 608 (a positive lens in this embodiment), and then sequentially passes through the second reflector 60213, the second dichroic element 609, the third reflector 60214, and the fourth lens 60215. It then passes through the central region of the dichroic element 6022 before entering 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, thereby improving the color and brightness of the primary color light.

[0074] More preferably, a relay lens 610 can be provided between the dichroic element 6022 and the light-collecting unit 604 along the optical path of the excitation light. The laser emitted by the second laser source 607 is focused by the fifth lens 608, and then passes sequentially through the second reflector 60213, the second dichroic element 609, the third reflector 60214 and the fourth lens 60215, and then through the central region of the dichroic element 6022, before entering the light-collecting unit 604 through the relay lens 610.

[0075] Of course, in this embodiment, the laser emitted by the second laser source 607, after being focused by the fifth lens 608, can also be incident through the third reflecting mirror 60214. Alternatively, after the laser emitted by the second laser source 607 is focused by the fifth lens 608, a dichroic filter with a regional coating can be added in the optical path between the relay lens 610 and the light collecting unit 604 to combine the light with the primary color light and the laser beam. These are all feasible, and their function is to improve the color of the primary color light and increase its brightness.

[0076] Example 6

[0077] The present invention also provides a projection device, which includes the light source device provided by the present invention, and the light source device can be any one of the light source devices in embodiments one to five above.

[0078] Compared with the prior art, the light source device and projection equipment of the present invention, by setting a wavelength conversion unit including a wavelength conversion region and a non-wavelength conversion region located sequentially on the optical path of the excitation light, when the wavelength conversion region is located on the optical path of the excitation light, part of the excitation light emitted by the laser source undergoes wavelength conversion in the wavelength conversion region to form received laser light, and the remaining excitation light becomes residual light and is reflected from the wavelength conversion region to the beam splitting and combining unit along with the received laser light; when the non-wavelength conversion region is located on the optical path of the excitation light, the excitation light forms primary color light in the non-wavelength conversion region and is directed towards the beam splitting and combining unit, and the non-wavelength conversion region includes optical path offset. The optical path offset module is used to offset the optical path of the excitation light entering the non-wavelength conversion region, so that the optical path of the primary color light to the beam splitter and combiner unit does not coincide with the optical path of the residual light to the beam splitter and combiner unit. The laser and primary color light are guided to the light collection area through the beam splitter and combiner unit to enter the subsequent optical path, and the residual light is guided to the filter area through the beam splitter and combiner unit to be filtered out. This achieves the purpose of distinguishing between primary color light and residual light and filtering out residual light without using a color correction filter. This 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, making it easier to miniaturize.

[0079] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0080] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0081] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0082] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0083] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this application.

[0084] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

[0085] Those skilled in the art will understand that the above embodiments are specific examples of implementing the present invention, and in practical applications, various changes in form and detail may be made without departing from the spirit and scope of the present invention.

Claims

1. A light source device, characterized in that, include: A laser light source, used to emit excitation light; The light splitter and combiner unit is used to guide the direction of the light path; A wavelength conversion unit includes a wavelength conversion region and a non-wavelength conversion region located sequentially in the optical path of the excitation light; When the wavelength conversion region is located in the optical path of the excitation light, part of the excitation light undergoes wavelength conversion in the wavelength conversion region to form laser light, and the remaining excitation light becomes residual light and is reflected from the wavelength conversion region to the beam splitting and combining unit along with the laser light. When the non-wavelength conversion region is located on the optical path of the excitation light, the excitation light forms primary color light in the non-wavelength conversion region and is directed toward the light splitting and combining unit. The non-wavelength conversion region includes an optical path offset module. The optical path offset module includes an excitation light transmission region, a second focusing lens, and a second reflection unit arranged sequentially along the incident direction of the excitation light. The optical path offset module is used to offset the optical path of the excitation light entering the non-wavelength conversion region so that the optical path of the primary color light toward the light splitting and combining unit does not coincide with the optical path of the residual light toward the light splitting and combining unit. A light-collecting unit is disposed after the light-splitting and light-combining unit along the light-emitting direction of the laser beam, the residual light, and the primary color light. The light-collecting unit includes a light-collecting area and a light-filtering area. The laser beam and the primary color light are guided to the light-collecting area via the light-splitting and light-combining unit to enter the subsequent optical path, and the residual light is guided to the light-filtering area via the light-splitting and light-combining unit to be filtered out.

2. The light source device as described in claim 1, characterized in that, The device further includes a first focusing lens. Along the incident direction of the excitation light, the beam splitting and combining unit, the first focusing lens, and the wavelength conversion unit are arranged in sequence. The excitation light passes through the beam splitting and combining unit and the first focusing lens in sequence to reach the wavelength conversion unit. The laser light, the residual light, and the primary color light formed pass through the first focusing lens and the beam splitting and combining unit in sequence and are then directed toward the light collecting unit.

3. The light source device as described in claim 2, characterized in that, The beam splitting and combining unit includes a first reflecting unit and a dichroic element that transmits the excitation light and reflects the laser beam. The optical axis of the first focusing lens coincides with the optical axis of the dichroic element. The laser beam is reflected by the dichroic element to the light-collecting area of ​​the light-collecting unit. The primary color light passes through the dichroic element and is reflected by the first reflecting unit to the light-collecting area of ​​the light-collecting unit. The residual light passes through the dichroic element and is reflected by the first reflecting unit to the filtering area of ​​the light-collecting unit.

4. The light source device as described in claim 3, characterized in that, When the non-wavelength conversion region is located in the excitation light path, the excitation light reaching the wavelength conversion unit passes through the excitation light transmission region and the second condenser lens in sequence before reaching the second reflection unit. After being reflected by the second reflection unit, it passes through the second condenser lens and the excitation light transmission region in sequence to form the primary color light. The optical axis of the second condenser lens does not coincide with the optical axis of the first condenser lens.

5. The light source device as described in claim 3, characterized in that, The optical path offset module includes an excitation light transmission area and a reflector cup arranged sequentially along the incident direction of the excitation light. When the non-wavelength conversion area is located on the optical path of the excitation light, the excitation light that reaches the wavelength conversion unit passes through the excitation light transmission area and then reaches the reflector cup. After being reflected by the reflector cup, it passes through the excitation light transmission area to form the primary color light. The optical axis of the reflector cup does not coincide with the optical axis of the first condenser lens.

6. The light source device as described in claim 3, characterized in that, The non-wavelength conversion region has a light-transmitting layer near the excitation light incident surface and a reflective layer away from the excitation light incident surface along its thickness direction. The light-transmitting layer and the reflective layer constitute the optical path offset module. When the non-wavelength conversion region is located on the excitation light optical path, the excitation light reaching the wavelength conversion unit passes through the light-transmitting layer and reaches the reflective layer. After being reflected by the reflective layer, it passes through the light-transmitting layer a second time to form the primary color light. The incident direction of the excitation light does not coincide with the optical axis of the first condenser lens.

7. The light source device as described in claim 3, characterized in that, The light-collecting unit is either a compound eye unit or a square rod unit: when it is a compound eye unit, the light-collecting area is the area covered by the accommodating angle range of the compound eye unit, and the filtering area is the area outside the accommodating angle range of the compound eye unit; when it is a square rod unit, the light-collecting area is the light-inlet area of ​​the square rod unit, and the filtering area is the area outside the light-inlet area of ​​the square rod unit.

8. The light source device as described in claim 4 or 5, characterized in that, The wavelength conversion unit is a rotating color wheel, and the excitation light transmission region is located on the wheel body of the rotating color wheel.

9. The light source device as described in claim 6, characterized in that, The wavelength conversion unit is a rotating color wheel, and the non-wavelength conversion region is formed on the wheel body of the rotating color wheel. 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 increase the offset between the optical path of the primary color light to the light splitting and combining unit and the optical path of the residual light to the light splitting and combining unit.

10. A projection device comprising a light source device as described in any one of claims 1 to 9.

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