CN113917778A

CN113917778A - Light source device and projection equipment

Info

Publication number: CN113917778A
Application number: CN202010662330.2A
Authority: CN
Inventors: 杨炳柯; 王则钦; 郭祖强; 李屹
Original assignee: Appotronics Corp Ltd
Current assignee: Shenzhen Appotronics Corp Ltd
Priority date: 2020-07-10
Filing date: 2020-07-10
Publication date: 2022-01-11
Also published as: WO2022007700A1

Abstract

The invention provides a light source device, comprising a laser light source; a light splitting and combining unit; a wavelength conversion unit including a wavelength conversion region and a non-wavelength conversion region; when the wavelength conversion area is positioned on the light path of the exciting light, part of the exciting light is subjected to wavelength conversion to form excited light, and the rest exciting light becomes residual light and is reflected from the wavelength conversion area to the light splitting and combining unit along with the excited light; the exciting light forms primary light in the non-wavelength conversion region and emits the primary light to the light splitting and combining unit, and the non-wavelength conversion region comprises a light path deviation module which is used for enabling the light path of the primary light emitted to the light splitting and combining unit to be not overlapped with the light path of the residual light emitted to the light splitting and combining unit; the light collecting unit comprises a light collecting area and a light filtering area, the laser light and the primary color light are guided to the light collecting area through the light splitting and combining unit to enter a subsequent light path, and the residual light is guided to the light filtering area through the light splitting and combining unit to be filtered. Thereby realizing the distinguishing and filtering of the primary light and the residual light. The invention also provides projection equipment.

Description

Light source device and projection equipment

Technical Field

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

Background

In recent years, the design of laser projection apparatuses is continuously advancing toward miniaturization and high brightness. At present, a laser projection apparatus generally includes a fluorescent laser light source, an optical system, and a spatial light modulator, and laser projection is realized by the cooperation of the three components. The fluorescent laser light source generally includes a fluorescent wheel device and a color correction wheel device. There are some designs of light sources where the two devices are located on two motors (wheels) and there are also some designs of light sources where the two devices are located on one motor (wheel). For the fluorescent laser light source with the fluorescent wheel device and the color correction wheel device arranged on one motor, the size of the fluorescent laser light source is often limited by the diameter of the color wheel in the color correction wheel device, so that the fluorescent laser light source is difficult to be made smaller. Therefore, to further miniaturize the laser projection apparatus, a light source solution without a color correction film needs to be considered. In general, a fluorescent laser light source in a laser projection apparatus emits excitation light, and part of residual light which is not absorbed and converted by phosphor powder is attached to fluorescence generated by excitation of the excitation light, and the color quality of the fluorescence as primary light is seriously affected by the residual light mixed in the fluorescence, so that an important purpose of using a color correction sheet is to filter the residual light. Therefore, for a fluorescent laser light source of a laser projection device without a color correction film, how to distinguish between primary light and residual light in fluorescent light so as to further filter the residual light in the fluorescent light is a problem to be solved by those skilled in the art.

Disclosure of Invention

An object of an embodiment of the present invention is to provide a light source device and a projection apparatus, which can distinguish between residual light in primary light and fluorescent light to filter the residual light and simplify the structure.

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

a laser light source for emitting excitation light;

a light splitting and combining unit for guiding the light path direction;

the wavelength conversion unit comprises a wavelength conversion region and a non-wavelength conversion region which are sequentially positioned on the light path of the exciting light;

when the wavelength conversion region is positioned on the exciting light optical path, part of the exciting light is subjected to wavelength conversion in the wavelength conversion region to form excited light, and the rest of the exciting light becomes residual light and is reflected from the wavelength conversion region to the light splitting and combining unit along with the excited light;

when the non-wavelength conversion region is located on the light path of the excitation light, the excitation light forms primary color light in the non-wavelength conversion region and emits the primary color light to the light splitting and combining unit, the non-wavelength conversion region comprises a light path offset module, and the light path offset module is used for performing light path offset on the excitation light emitted into the non-wavelength conversion region, so that the light path of the primary color light emitted to the light splitting and combining unit does not coincide with the light path of the residual light emitted to the light splitting and combining unit;

and the light collecting unit is arranged behind the light splitting and combining unit along the light emitting directions of the laser light, the residual light and the primary light, the light collecting unit comprises a light collecting region and a light filtering region, the laser light and the primary light are guided to the light collecting region through the light splitting and combining unit to enter a subsequent light path, and the residual light is guided to the light filtering region through the light splitting and combining unit to be filtered.

Preferably, the laser system further comprises a first condensing lens, the light splitting and combining unit, the first condensing lens and the wavelength conversion unit are sequentially arranged along the incident direction of the exciting light, the exciting 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 respectively sequentially pass through the first condensing lens and the light splitting and combining unit and then are emitted to the light collecting unit. 3. The light source device according to claim 2, wherein the light splitting and combining unit includes a first reflecting unit and a dichroic element that transmits the excitation light and reflects the received laser light, wherein an optical axis of the first condensing lens coincides with an optical axis of the dichroic element, the received laser light is reflected to a light collecting area of the light collecting unit via the dichroic element, the primary color light is reflected to a light collecting area of the light collecting unit via the first reflecting unit after passing through the dichroic element, and the residual light is reflected to a light filtering area of the light collecting unit via the first reflecting unit after passing through the dichroic element.

Preferably, the optical path shifting module includes an excitation light transmission region, a second condensing lens and a second reflection unit, which are sequentially arranged along the incident direction of the excitation light, when the non-wavelength conversion region is located on the excitation light optical path, the excitation light reaching the wavelength conversion unit sequentially passes through the excitation light transmission region and the second condensing lens, reaches the second reflection unit, and sequentially passes through the second condensing lens and the excitation light transmission region after being reflected by the second reflection unit to form the primary light, wherein an optical axis of the second condensing lens does not coincide with an optical axis of the first condensing lens.

Preferably, the optical path shifting module includes an excitation light transmission region and a reflection cup sequentially arranged along the incident direction of the excitation light, when the non-wavelength conversion region is located on the excitation light optical path, the excitation light reaching the wavelength conversion unit reaches the reflection cup after passing through the excitation light transmission region, and passes through the excitation light transmission region after being reflected by the reflection cup to form the primary light, wherein an optical axis of the reflection cup does not coincide with an optical axis of the first condensing lens.

Preferably, a light transmitting layer close to the excitation light incident surface and a light reflecting layer far from the excitation light incident surface are formed in the non-wavelength conversion region along the thickness direction of the non-wavelength conversion region, the light transmitting layer and the light reflecting layer constitute the light path offset module, when the non-wavelength conversion region is located on the excitation light path, the excitation light reaching the wavelength conversion unit passes through the light transmitting layer and then reaches the light reflecting layer, and after being reflected by the light reflecting layer, the excitation light passes through the light transmitting layer for the second time to form the primary color light, wherein the incident direction of the excitation light is not coincident with the optical axis of the first condensing lens.

Preferably, the light collecting unit is a compound eye unit or a square rod unit: when the compound eye unit is used, the light collecting area is an area covered by the accommodating angle range of the compound eye unit, and the light filtering area is an area outside the area covered by the accommodating angle range of the compound eye unit; when the square rod unit is used, the light collecting area is a light inlet area of the square rod unit, and the light filtering area is an area outside the light inlet area of the square rod unit.

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

Preferably, the wavelength conversion unit is a rotating color wheel, and the non-wavelength conversion region is formed on a wheel body of the rotating color wheel, wherein the light transmitting layer has an optical surface for modulating an incident angle of the light beam, and the optical surface expands an offset between a light path of the primary light directed to the light splitting and combining unit and a light path of the residual light directed to the light splitting and combining unit by modulating the incident angle of the light beam.

The invention also provides projection equipment which comprises the light source device provided by the invention.

Compared with the prior art, in the light source device and the projection equipment, the wavelength conversion unit comprising the wavelength conversion region and the non-wavelength conversion region which are positioned on the light path of the exciting light in time sequence is arranged, when the wavelength conversion region is positioned on the light path of the exciting light, the wavelength conversion of part of the exciting light emitted by the laser light source is carried out in the wavelength conversion region to form excited light, and the rest of the exciting light becomes residual light and is reflected to the light splitting and combining unit from the wavelength conversion region along with the excited light; when the non-wavelength conversion region is located on the light path of the excitation light, the excitation light forms primary color light in the non-wavelength conversion region and emits the primary color light to the light splitting and combining unit, the non-wavelength conversion region comprises a light path offset module, and the light path offset module is used for performing light path offset on the excitation light emitted into the non-wavelength conversion region, so that the light path of the primary color light emitted to the light splitting and combining unit does not coincide with the light path of the residual light emitted to the light splitting and combining unit; the light receiving device and the primary light are guided to the light collecting area through the light splitting and combining unit to enter a subsequent light path, and the residual light is guided to the light filtering area through the light splitting and combining unit to be filtered, so that the primary light and the residual light can be distinguished under the condition of not adopting a color correction sheet, the purpose of filtering the residual light is achieved, the optical performance of the light source device and the projection equipment is improved, the structures of the light source device and the projection equipment are simplified, and the miniaturization is facilitated.

Drawings

One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the figures in which like reference numerals refer to similar elements and which are not to scale unless otherwise specified.

FIG. 1 is a schematic partial structural diagram of a light source device according to a first embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a light collecting unit being a square rod unit according to an embodiment of a light source device of the present invention;

FIG. 3 is a schematic partial structural diagram of a second embodiment of a light source device according to the present invention;

FIG. 4 is a schematic partial structural diagram of a third embodiment of a light source device according to the present invention;

FIG. 5 is a schematic partial structural diagram of a fourth embodiment of a light source device according to the present invention;

fig. 6 is a schematic partial structure diagram of a fifth embodiment of a light source device according to the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that numerous technical details are set forth in order to provide a better understanding of the present application in various embodiments of the present invention. However, the technical solution claimed in the present application can be implemented without these technical details and various changes and modifications based on the following embodiments. The following embodiments are divided for convenience of description, and should not constitute any limitation to the specific implementation manner of the present invention, and the embodiments may be mutually incorporated and referred to without contradiction.

Example one

Referring to fig. 1, 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.

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

The light splitting and combining unit 102 is used for guiding the light path direction.

The wavelength conversion unit 103 includes a wavelength conversion region and a non-wavelength conversion region 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, a part of the excitation light is subjected to wavelength conversion in the wavelength conversion region to form excited light, and the rest of the excitation light becomes residual light and is reflected from the wavelength conversion region to the light splitting and combining unit 102 along with the excited light.

When the non-wavelength conversion region is located on the excitation light optical path, the excitation light forms a primary color light in the non-wavelength conversion region and emits the primary color light to the light splitting and combining unit 102. The non-wavelength conversion region includes an optical path shifting module 1031, and the optical path shifting module 1031 is configured to shift an optical path of the excitation light entering the non-wavelength conversion region, so that an optical path of the primary light formed by the excitation light in the non-wavelength conversion region and emitted to the light splitting and combining unit 102 is not overlapped with an optical path of the residual light and emitted to the light splitting and combining unit 102. Thus, the discrimination of the residual light and the primary light is realized.

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, the residual light, and the primary light. The light collecting unit 104 includes a light collecting region and a light filtering region, the light receiving light and the primary light are guided to the light collecting region through the light splitting and combining unit 102 to enter a subsequent light path, and the residual light is guided to the light filtering region through the light splitting and combining unit 102 to be filtered. Thereby realizing the filtering of the residual light.

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

Of course, the light collecting unit 104 is not limited thereto, and as shown in fig. 2, the light collecting unit 104 is a square rod unit. The light collecting area is a light inlet area of the square rod unit, and the light filtering area is an area outside the light inlet area of the square rod unit.

The structure realizes the purposes of distinguishing the primary light and the residual light and filtering the residual light without using a color correction sheet, reduces optical elements, improves the optical performance of the light source device, simplifies the structure of the light source device and is beneficial to miniaturization.

In order to increase the incident effect of the excitation light to the wavelength conversion unit 103 and the incident effect of the excited light, the residual light, and the primary light to the light collecting unit 104, the light source device 100 further includes a first condensing lens 105, the light splitting and combining unit 102, the first condensing lens 105, and the wavelength conversion unit 103 are sequentially disposed along the incident direction of the excitation light, the excitation light sequentially passes through the light splitting and combining unit 102 and the first condensing lens 105 to reach the wavelength conversion unit 103, and the formed excited light, the residual light, and the primary light sequentially pass through the first condensing lens 105 and the light splitting and combining unit 102 and then irradiate to the light collecting unit 104. The first condenser lens 105 is preferably a lens group including a first lens 1051 and a second lens 1052 which are arranged in this order in the incident direction of the excitation light and have optical axes overlapping each other.

Specifically, in the present embodiment, the optical path shift module 1031 includes an excitation light transmission region 10311, a second condenser lens 10312 (a positive lens in the present embodiment), and a second reflection unit 10313, which are arranged in this order along the excitation light incidence direction. Preferably, the excitation light transmission region 10311 is located on a wheel body of the rotating color wheel, and the second condenser lens 10312 and the second reflection unit 10313 are disposed behind the wheel body in the excitation light incidence direction.

When the non-wavelength conversion region is located on the excitation light optical path, the excitation light reaching the wavelength conversion unit 103 sequentially passes through the excitation light transmission region 10311 and the second condenser lens 10312 to reach the second reflection unit 10313, and after being reflected by the second reflection unit 10313, the excitation light sequentially passes through the second condenser lens 10312 and the excitation light transmission region 10311 to form the primary light, wherein the optical axis of the second condenser lens 10312 is not overlapped with the optical axis of the first condenser lens 105, so that the primary light is reflected on an optical path different from the optical paths of the excited light and the residual light.

The light splitting and combining unit 102 includes a first reflection unit 1021 and a dichroic element 1022 that transmits the excitation light and reflects the stimulated light. Wherein 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 via the dichroic element 1022 for a subsequent light path; the primary light is reflected to the light collecting area of the light collecting unit 104 by the first reflecting unit 1021 after passing through the dichroic element 1022, and is used for a subsequent light path; the residual light is reflected to the filter region of the light collecting unit 104 by the first reflecting unit 1021 after passing through the dichroic element 1022, so as to realize filtering.

In the present embodiment, the light source device 100 further includes a light uniformizing device 106 to improve the uniformity of incidence of the excitation light. The laser light source 101, the dodging device 106, the light splitting and combining unit 102, the first condensing lens 105, and the wavelength conversion unit 103 are sequentially disposed along the incident direction of the excitation light.

Of course, a relay lens 110 may also be provided 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 laser light source 101 emits excitation light, which is homogenized by the light uniformizing device 106, and then, the excitation light passes through the dichroic element 1022, passes through the first lens 1051 and the second lens 1052 of the first condenser lens 105, and reaches the wavelength conversion unit 103. For a conventional monolithic spatial light modulator optical-mechanical system, the wavelength conversion unit 103 is illustrated by taking a rotating color wheel as an example, and the rotating color wheel is divided into multiple segments, such as RGB (red, green, blue, yellow), RGBY (red, green, blue, yellow), RGBW (red, green, blue, white), and the like. In this embodiment, taking an RGB 3-segment type rotating color wheel as an example, when the rotating color wheel is located in R (red) and G (green) segments, that is, when the wavelength converting region of the wavelength converting unit 103 is located on the light path, the blue excitation light irradiated on the rotating color wheel excites fluorescence (excited 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 light condensing unit 104; when the rotating color wheel is in the B (blue) segment, that is, the non-wavelength conversion region of the wavelength conversion unit 103 is located on the light path, that is, the (blue) primary light is transmitted in the B segment, passes through the second condenser lens 10312, reaches the second reflection unit 10313, is reflected by the second reflection unit 10313, and returns 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 that the light beam may be misaligned when passing through the second condenser lens 10312 2 for 2 times, i.e. pass through a section of "V" shaped optical path. In this way, when the light beam of the (blue) primary color light passes through the rotating color wheel 106 again, the spot position is shifted from the first spot position by a certain amount, and the shift amount causes the optical axis of the light beam of the (blue) primary color light after passing through the second lens 1052 and the first lens 1051 in sequence to be tilted (compared with the optical axis of the received laser light). The light beam of the (blue) primary color light is reflected by the first reflection unit 1021 (the first reflection unit 1021 is disposed at an angle different from 45 °), and then reaches the light collection unit 104 through the dichroic element 1022, where the light collection unit 104 is a compound eye unit in this embodiment.

When the (blue) excitation light excites the fluorescence (i.e., the excited light), the unabsorbed blue light (i.e., the residual light) passes through the second lens 1052 and the first lens 1051 together with the fluorescence to reach the dichroic element 1022. Due to the wavelength difference, the unabsorbed blue light (residual light) is transmitted through the dichroic element 1022, wherein a portion of the residual light is reflected by the first reflection unit 1021, and the remaining portion of the residual light is absorbed by each module (including structural members) in the light source device 100.

The present invention utilizes the difference in beam angle emitted from the second lens 1052 and the first lens 1051 caused by the difference in the position of light emission from the rotary color wheel and the position of the fluorescent light spot (residual light spot) after the (blue) primary light passes through the second condenser lens 10312 and the second reflection unit 10313, thereby realizing the distinction between the (blue) primary light and the residual light. Due to the different angles, the residual light enters the light collecting unit 104 at a larger oblique angle after being reflected by the first reflecting unit 1021, and the primary color light (blue) enters the light collecting unit 104 (i.e. the compound eye unit 104) at normal incidence or at a smaller oblique angle. The compound eye unit 104 is required to have an angle of incident light, and incident light within a range of the accommodation angle can pass through the rear optical system (not shown) after passing through the compound eye unit 104. When the light is irradiated on the spatial light modulator, the incident light beyond the accommodation range becomes a side lobe, and is lost when passing through the rear optical system, and cannot be emitted from the optical system. By using this characteristic, as long as the incident angle of the (blue) primary light reflected by the first reflection unit 1021 is within the accommodation range of the compound eye unit 104 and the incident angle of the residual light is outside the accommodation range of the compound eye unit 104, the (blue) primary light and the residual light can be distinguished, thereby facilitating subsequent filtering of the residual light.

Second embodiment

The second embodiment of the present invention is basically the same as the first embodiment, and differs from the first embodiment in that the optical path deviation module has a different structure, specifically as follows:

as shown in fig. 3, in the light source device 300, in the non-wavelength conversion region of the wavelength conversion unit 303, the optical path deviation module 3031 includes an excitation light transmission region 30311 and a reflection cup 30312 sequentially arranged along the incidence direction of the excitation light. Preferably, in this embodiment, the wavelength conversion unit 303 is a rotating color wheel, and the reflecting cup 30312 is disposed behind a wheel body of the rotating color wheel along the incident direction of the excitation light.

When the non-wavelength conversion region is located on the excitation light optical path, the excitation light reaching the wavelength conversion unit 303 reaches the reflection cup 30312 after passing through the excitation light transmission region 30311, and the primary color light is formed by passing through the excitation light transmission region 30311 after being reflected by the reflection cup 30312. The optical axis of the reflecting cup 30312 is not aligned with the optical axis of the first condenser lens 305 (the optical axis of the second lens 3052 is aligned with the optical axis of the first lens 3051), so that the primary light is reflected on a light path different from the light receiving beam and the residual light. 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 of the first embodiment, and are not described herein again.

Third embodiment

The third embodiment of the present invention is basically the same as the first embodiment, and the difference is that the optical path deviation module has a different structure, specifically as follows:

as shown in fig. 4, in the light source device 400, a light transmissive layer 40312 close to the excitation light incident surface and a light reflective layer 40313 far from the excitation light incident surface are formed in the non-wavelength conversion region of the wavelength conversion unit 403 along the thickness direction, and the light transmissive layer 40312 and the light reflective layer 40313 form the light path deviation module 4031. When the non-wavelength conversion region is located on the excitation light optical path, the excitation light reaching the wavelength conversion unit 403 passes through the light transmissive layer 40312 and then reaches the light reflective layer 40313, and after being reflected by the light reflective layer 40313, the excitation light passes through the light transmissive layer 40312 for the second time to form the primary light, wherein 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 in an inclined manner.

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 this case, when the non-wavelength conversion region is located on the excitation light 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 forming the primary light is different from the optical path of the excitation light forming the residual light, and because the excitation light is incident to the wavelength conversion unit 403 in an inclined manner, the optical path of the primary light emitted to the light splitting and combining unit is not overlapped with the optical path of the residual light emitted 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 a wheel body of the rotating color wheel. Preferably, the light-transmitting layer 40312 may have an optical surface for modulating an incident angle of the light beam by a method such as plating or designing a microstructure, and the optical surface may expand an offset between an optical path of the primary light to the light splitting and combining unit 402 (the dichroic element 4022 and the first reflecting unit 4021) and an optical path of the residual light to the light splitting and combining unit 402 by modulating the incident angle of the light beam.

For example, the light-transmitting layer 40312 may be configured to be gaussian-scattering, so that the primary light is scattered at a larger angle after passing through the light-transmitting layer 40312 twice, and when the primary light passes through the first condenser lens 405 (the second lens 4052, the first lens 4051) again, the cross-sectional area of the light beam of the primary light is diffused at a larger angle, and then reaches the first reflecting unit 4021 through the dichroic element 4022 to be reflected into the light collecting unit 404. The purpose of scattering the light beams of primary light is to enter the light collecting unit 404 with a larger cross section, resulting in a better light homogenizing effect.

Of course, according to different design requirements, the optical path of the primary light to the combined light splitting unit and the optical path of the residual light to the combined light splitting unit may not be overlapped only by the difference in the optical path described above without performing special processing on the light-transmitting layer 40312.

Embodiment IV

The fourth embodiment of the present invention is basically the same as the first embodiment, and differs therefrom in that: a fourth embodiment is different from the first embodiment in the light splitting and combining unit in the first embodiment in the structure of the first reflection unit, and specifically includes the following:

as shown in fig. 5, in the light splitting and combining unit 502 of the light source device 500, along the light emitting direction of the received laser light, the residual light, and the primary light, the first reflecting unit 5021 includes a first reflecting mirror 50211, a third lens 50212, a second reflecting mirror 50213, a third reflecting mirror 50214, and a fourth lens 50215, which are sequentially disposed behind the dichroic element 5022.

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

The blue residual light, which has a different angle from the primary light, enters the third lens 50212 and the rear light path at a different angle after being reflected by the first reflector 50211. Specifically, the residual light is reflected by the wavelength conversion unit 503 (in this embodiment, a rotating color wheel), then passes through the dichroic element 5022 of the light splitting and combining unit 502, and is reflected by the first reflecting mirror 50211, but because the angle of the residual light is different from the incident angle of the primary light, the residual light is reflected by the first reflecting mirror 50211, then is sequentially transmitted through the third lens 50212, the second reflecting mirror 50213, the third reflecting mirror 50214, and the fourth lens 50215, and is gradually consumed during transmission, so that the residual light is filtered, and does not reach the final subsequent light path.

The structural arrangement of the first reflection unit 5021 more effectively realizes the filtering of the residual light. And then gradually lost in the propagation path of the light and not reach the final light modulator. The primary light passes through the light path of the first reflection unit 5021 to expand the light beam, and the expanded light beam can pass through the light collection unit 504 to be uniform in more areas when passing through the light collection unit 504, so that better uniformity is achieved. In this embodiment, beam expansion is achieved by using two positive lens groups, namely, a third lens 50212 and a fourth lens 50215, which may also be actually achieved by using a positive lens group and a negative lens group.

Fifth embodiment

A fifth embodiment of the present invention is basically the same as the fourth embodiment, and is mainly different from the fourth embodiment in that: in a fifth embodiment, a second laser light source is added on the basis of the fourth embodiment, and the color of the light beam of the second laser light source is different from the color of the light beam of the laser light source in the fourth embodiment, so as to improve the color and the brightness, specifically as follows:

as shown in fig. 6, the light source device 600 is further provided with a second laser light source 607 and a fifth lens 608, and a second dichroic element 609 arranged between the second reflecting mirror 60213 and the third reflecting mirror 60214 along the optical path of the excitation light. For example, the laser source 601 is a yellow/blue laser, and the second laser source 607 is a red/green laser.

The laser light emitted from the second laser light source 607 is condensed by the fifth lens 608 (a positive lens in this embodiment), passes through the second reflecting mirror 60213, the second dichroic element 609, the third reflecting mirror 60214, and the fourth lens 60215 in this order, passes through the central region of the dichroic element 6022, and then enters the light collecting unit 604. The second dichroic element 609 can homogenize the (blue) primary light and the red/green laser light while eliminating speckle, thereby achieving the purpose of improving the color of the primary light and increasing the brightness thereof.

Preferably, a relay lens 610 may be further provided between the dichroic element 6022 and the light collecting unit 604 along the optical path of the excitation light. The laser light emitted from the second laser light source 607 is condensed by the fifth lens 608, passes through the second mirror 60213, the second dichroic element 609, the third mirror 60214, and the fourth lens 60215 in this order, then passes through the central region of the dichroic element 6022, and then enters the light collecting unit 604 through the relay lens 610.

Of course, in the present embodiment, the laser light emitted from the second laser light source 607 may be condensed by the fifth lens 608 and then incident on the third reflecting mirror 60214. Alternatively, after the laser light emitted from the second laser light source 607 is condensed by the fifth lens 608, a dichroic sheet with a coated area may be added to the optical path between the relay lens 610 and the light condensing unit 604 to combine with the primary color light and the laser light. This is possible, and the effect is to improve the color of the primary light and to increase its brightness.

EXAMPLE six

The invention also provides a projection device, which comprises the light source device provided by the invention, and the light source device can be any one of the first to the fifth embodiments.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

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 the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

In the description of the present application, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience of description and simplicity of description only, and in the case of not making a reverse description, these directional terms do not indicate and imply that the device or element being referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore, should not be considered as limiting the scope of the present application; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the 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 a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of protection of the present application is not to be construed as being limited.

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

It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples for carrying out the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in practice.

Claims

1. A light source device, comprising:

a laser light source for emitting excitation light;

a light splitting and combining unit for guiding the light path direction;

2. The light source device according to claim 1, further comprising a first condensing lens, wherein the light splitting and combining unit, the first condensing lens and the wavelength conversion unit are sequentially disposed along an incident direction of the excitation light, 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 stimulated light, the residual light and the primary light sequentially pass through the first condensing lens and the light splitting and combining unit respectively and then are emitted to the light collecting unit.

3. The light source device according to claim 2, wherein the light splitting and combining unit includes a first reflecting unit and a dichroic element that transmits the excitation light and reflects the received laser light, wherein an optical axis of the first condensing lens coincides with an optical axis of the dichroic element, the received laser light is reflected to a light collecting area of the light collecting unit via the dichroic element, the primary color light is reflected to a light collecting area of the light collecting unit via the first reflecting unit after passing through the dichroic element, and the residual light is reflected to a light filtering area of the light collecting unit via the first reflecting unit after passing through the dichroic element.

4. The light source device according to claim 3, wherein the optical path shift module includes an excitation light transmission region, a second condensing lens, and a second reflection unit, which are sequentially arranged along the excitation light incidence direction, and when the non-wavelength conversion region is located on the excitation light optical path, the excitation light reaching the wavelength conversion unit sequentially passes through the excitation light transmission region and the second condensing lens to reach the second reflection unit, and after being reflected by the second reflection unit, the excitation light transmission region sequentially passes through the second condensing lens to form the primary light, and an optical axis of the second condensing lens is not coincident with an optical axis of the first condensing lens.

5. The light source device according to claim 3, wherein the optical path shift module includes an excitation light transmission region and a reflection cup arranged in this order along the excitation light incidence direction, and 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 excitation light transmission region and reaches the reflection cup, and the excitation light passes through the excitation light transmission region after being reflected by the reflection cup to form the primary light, wherein an optical axis of the reflection cup is not coincident with an optical axis of the first condensing lens.

6. The light source device according to claim 3, wherein the non-wavelength converting region is formed with a light transmitting layer close to the excitation light incident surface and a light reflecting layer far from the excitation light incident surface along a thickness direction thereof, the light transmitting layer and the light reflecting layer constitute the light path shifting module, when the non-wavelength converting region is located on the excitation light path, the excitation light reaching the wavelength converting unit passes through the light transmitting layer and reaches the light reflecting layer, and passes through the light transmitting layer twice after being reflected by the light reflecting layer to form the primary light, wherein an incident direction of the excitation light does not coincide with an optical axis of the first condensing lens.

7. The light source device according to claim 3, wherein the light collecting unit is a fly-eye unit or a square-rod unit: when the compound eye unit is used, the light collecting area is an area covered by the accommodating angle range of the compound eye unit, and the light filtering area is an area outside the area covered by the accommodating angle range of the compound eye unit; when the square rod unit is used, the light collecting area is a light inlet area of the square rod unit, and the light filtering area is an area outside the light inlet area of the square rod unit.

8. 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 region is located on a wheel body of the rotating color wheel.

9. The light source device according to claim 6, wherein the wavelength conversion unit is a rotating color wheel, and the non-wavelength conversion region is formed on a wheel body of the rotating color wheel, wherein the light transmissive layer has an optical surface that modulates an incident angle of the light beam, and the optical surface expands an offset between an optical path of the primary color light toward the light splitting and combining unit and an optical path of the residual light toward the light splitting and combining unit by modulating the incident angle of the light beam.

10. A projection apparatus comprising the light source device according to any one of claims 1 to 9.