CN112859353A

CN112859353A - Light source device

Info

Publication number: CN112859353A
Application number: CN201911103556.2A
Authority: CN
Inventors: 陈彬; 陈兴加
Original assignee: Appotronics Corp Ltd
Current assignee: Shenzhen Appotronics Corp Ltd; YLX Inc
Priority date: 2019-11-12
Filing date: 2019-11-12
Publication date: 2021-05-28
Also published as: WO2021093565A1

Abstract

The invention discloses a light source device, which comprises an excitation light source, a wavelength conversion element and a light guide element. The excitation light source is used for generating excitation light. The wavelength conversion element is used for converting at least part of received exciting light into stimulated light and emitting the stimulated light or mixed light of the stimulated light and the unexcited exciting light. The light guide element is arranged on a light path of the laser or the mixed light emitted by the wavelength conversion element and comprises a core layer and a cladding layer coated outside the core layer. The core layer has a first predetermined profile and the cladding layer has a second predetermined profile. The light guide element is provided with a first end close to the wavelength conversion element, the core layer is used for transmitting and homogenizing the laser light or the mixed light emitted to the core layer of the first end through the wavelength conversion element, and the cladding layer is used for transmitting and homogenizing the laser light or the mixed light emitted to the cladding layer of the first end through the wavelength conversion element, so that an illumination light spot with a preset shape can be obtained, and the light utilization rate is improved.

Description

Light source device

Technical Field

The invention relates to the technical field of display and illumination, in particular to a light source device.

Background

The semiconductor laser light source has higher brightness and smaller light emitting angle relative to a Light Emitting Diode (LED) light source, and the laser light source is adopted to excite the fluorescent device, so that the illumination light source with higher brightness can be obtained. However, when the laser fluorescent light source is applied to different fields, the requirements for the illumination light spots are different, and in the prior art, a light shaping device such as a diaphragm is usually arranged on an emergent light path of the illumination light to shape the illumination light, so that the required illumination light spots are obtained, but the light utilization rate is reduced to a certain extent.

Disclosure of Invention

In view of the above, the present invention provides a light source device to solve the above problems.

The invention provides a light source device, which comprises an excitation light source, a wavelength conversion element and a light guide element. The excitation light source is used for generating excitation light. The wavelength conversion element is used for converting at least part of received exciting light into stimulated light and emitting the stimulated light or mixed light of the stimulated light and the unexcited exciting light. The light guide element is arranged on a light path of the laser or the mixed light emitted by the wavelength conversion element and comprises a core layer and a cladding layer coated outside the core layer. The core layer has a first predetermined profile and the cladding layer has a second predetermined profile. The light guide element has a first end close to the wavelength conversion element, the core layer is used for transmitting and homogenizing the stimulated light or the mixed light emitted to the core layer of the first end through the wavelength conversion element, and the cladding layer is used for transmitting and homogenizing the stimulated light or the mixed light emitted to the cladding layer of the first end through the wavelength conversion element.

Through the arrangement, based on the fact that the core layer has the first preset shape and the cladding layer has the second preset shape, the illuminating light spot with the preset shape can be formed, and the light source device can meet different application fields. In addition, the excited light or the mixed light of the excited light and the non-excited excitation light emitted by the wavelength conversion element is transmitted through the core layer and the cladding layer of the light guide element, that is, the core layer can be used for transmitting and homogenizing the excited light or the mixed light emitted to the core layer at the first end through the wavelength conversion element, and the cladding layer can be used for transmitting and homogenizing the excited light or the mixed light emitted to the cladding layer at the first end through the wavelength conversion element. The core layer and the cladding layer of the light guide element can collect the excited light and the mixed light emitted by the wavelength conversion element, so that the light utilization rate of the light source device is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a light source device according to an embodiment of the present invention.

Fig. 2 is a sectional view of a light guide member of a light source device according to a first embodiment of the present invention.

Fig. 3 is a sectional view of a light guide member of a light source device according to a second embodiment of the present invention.

Fig. 4 is a sectional view of a light guide member of a light source device according to a third embodiment of the present invention.

Fig. 5 is a sectional view of a light guide member of a light source device according to a fourth embodiment of the present invention.

Fig. 6A is a cross-sectional view of a light guide member of a light source device according to a fifth embodiment of the present invention.

Fig. 6B is a left side view of a light guide member of a light source device provided in a fifth embodiment of the present invention.

Fig. 7A is a cross-sectional view of a light guide member of a light source device according to a sixth embodiment of the present invention.

Fig. 7B is a left side view of a light guide member of a light source device according to a sixth embodiment of the present invention.

Fig. 8A is a sectional view of a light guide member of a light source device according to a seventh embodiment of the present invention.

Fig. 8B is a left side view of a light guide member of a light source device according to a seventh embodiment of the present invention.

Fig. 9A is a cross-sectional view of a light guide member of a light source device according to an eighth embodiment of the present invention.

Fig. 9B is a left side view of a light guide member of a light source device according to an eighth embodiment of the present invention.

Fig. 10A is a cross-sectional view of a light guide member of a light source device according to a ninth embodiment of the present invention.

Fig. 10B is a left side view of a light guide member of a light source device according to a ninth embodiment of the present invention.

Fig. 11A is a cross-sectional view of a light guide member of a light source device according to a tenth embodiment of the present invention.

Fig. 11B is a left side view of a light guide member of a light source device according to a tenth embodiment of the present invention.

Fig. 12A is a cross-sectional view of a light guide member of a light source device according to an eleventh embodiment of the present invention.

Fig. 12B is a left side view of a light guide member of a light source device according to an eleventh embodiment of the present invention.

Fig. 13A is a cross-sectional view of a light guide member of a light source device according to a twelfth embodiment of the present invention.

Fig. 13B is a left side view of a light guide member of a light source device according to a twelfth embodiment of the present invention.

Fig. 14A is a sectional view of a light guide member of a light source device according to a thirteenth embodiment of the present invention.

Fig. 14B is a left side view of a light guide member of a light source device according to a thirteenth embodiment of the present invention.

Fig. 15A and 15B are light spot distribution diagrams at the end face of the light guide element near the light splitting element obtained by modeling simulation of the light guide element of fig. 9.

Fig. 16A and 16B are light spot distribution diagrams at the end face of the light guide element near the light splitting element obtained by modeling simulation of the light guide element of fig. 10.

Fig. 17A and 17B are light spot distribution diagrams at the end face of the light guide element near the light splitting element obtained by modeling simulation of the light guide element of fig. 12.

Fig. 18 is a schematic structural diagram of a light source device according to another embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It is to be understood that the terminology used in the description and claims of the present invention, and the appended drawings are for the purpose of describing particular embodiments only, and are not intended to be limiting of the invention. The terms "first," "second," and the like in the description and claims of the present invention and in the above-described drawings are used for distinguishing between different objects and not for describing a particular order. The singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The term "comprises" and any variations thereof is intended to cover non-exclusive inclusions. Furthermore, the present invention may be embodied in many different forms and is not limited to the embodiments described in the present embodiment.

In the context of the present invention, the term "cross-section" is a plane obtained by cutting perpendicular to the centerline of the light-guiding member (i.e., the centerline of the core layer), and the longitudinal section is a plane obtained by cutting along the centerline of the light-guiding member (i.e., the centerline of the core layer). The term "width of a longitudinal section" is the distance between two opposite sides of the longitudinal section in a direction perpendicular to the centre line of the core layer. Specifically, the longitudinal section has a shortest distance between two end points on two opposite sides in a direction along a center line of the core layer, where the two end points are points formed by intersecting two opposite sides of the longitudinal section with a straight line perpendicular to the center line of the core layer, respectively. The term "outer shape" is to be understood as the outer shape of an object, i.e. the outer physical contour of an object.

While the specification concludes with claims describing preferred embodiments of the invention, it is to be understood that the above description is made only by way of illustration of the general principles of the invention and not by way of limitation of the scope of the invention. The scope of the present invention is defined by the appended claims.

Referring to fig. 1 and fig. 2 together, fig. 1 is a schematic structural diagram of a light source device 100 according to an embodiment of the present invention, and fig. 2 is a cross-sectional view of a light guide element 30 according to an embodiment of the present invention. The light source device 100 includes an excitation light source 10, a light guide member 30, and a wavelength conversion member 40. The excitation light source 10 is used to generate excitation light. The wavelength conversion element 40 is configured to convert the received excitation light at least partially into stimulated light, and emit the stimulated light or a mixture of the stimulated light and the non-stimulated excitation light. The light guide element 30 is disposed on an optical path of the laser beam or the mixed light emitted from the wavelength conversion element 40, and includes a core layer 31 and a cladding layer 32 covering the core layer 31. The core layer 31 has a first predetermined profile and the cladding layer 32 has a second predetermined profile. The light guide member 30 has a first end near the wavelength converting member 40, the core layer 31 for transmitting and homogenizing the excited light or the mixed light emitted onto the core layer 31 of the first end via the wavelength converting member 40, and the cladding layer 32 for transmitting and homogenizing the excited light or the mixed light emitted onto the cladding layer 32 of the first end via the wavelength converting member 40.

Wherein the cladding 32 comprises an inner sidewall 301 and an outer sidewall 302 arranged coaxially. In the present embodiment, the inner sidewall 301 is an interface between the core layer 31 and the cladding layer 32, that is, an outer wall of the core layer 31 extending in the axial direction or a sidewall of the cladding layer 32 near the core layer 31. The outer sidewall 302 is the exposed outer wall of the light guiding element 30 or cladding 32 that extends in the axial direction, i.e. the interface of the cladding 32 with air.

In the present embodiment, the core layer 31 is specifically used for transferring and homogenizing the light emitted from the wavelength converting element 40 having a divergence angle smaller than the first predetermined angle. The cladding 32 is particularly useful for passing and homogenizing light exiting the wavelength converting element 40 having a divergence angle greater than said first predetermined angle. Optionally, the cladding 32 is specifically configured to pass and homogenize light exiting the wavelength converting element 40 having a divergence angle greater than the first predetermined angle and less than the second predetermined angle. The first predetermined angle and the second predetermined angle may be set according to the size of the light guide element 30, the distance between the light guide element 30 and the wavelength conversion element 40, and the like, so that the core layer 31 may be used to transfer and homogenize the stimulated light or the mixed light emitted to the inner sidewall 301 of the cladding layer 32 via the wavelength conversion element 40, and the cladding layer 32 may be used to transfer and homogenize the stimulated light or the mixed light emitted to the outer sidewall 302 of the cladding layer 32 via the wavelength conversion element 40.

In the present embodiment, the excitation light source 10 includes, but is not limited to, a laser diode, and may also be a light emitting diode. Specifically, in one embodiment, the excitation light source 10 is a blue laser diode, and the wavelength conversion material is a yellow phosphor, so that the yellow phosphor absorbs blue light emitted from the blue laser diode to generate yellow excited light, wherein the unconverted blue light and the yellow excited light are mixed to obtain white light. In other embodiments, the excitation light source 10 and the wavelength conversion material may be selected from other colors according to actual needs.

The wavelength conversion element 40 is a reflective wavelength conversion element, that is, the incident surface of the excitation light and the emitting surface of the received laser light are located on the same side surface of the wavelength conversion element 40. The wavelength conversion element 40 includes a wavelength conversion layer and a substrate layer which are stacked in this order. The wavelength conversion layer contains a wavelength conversion material, and can convert the exciting light into excited light with another wavelength. The substrate layer may be a reflective layer for reflecting the wavelength conversion material to generate the stimulated light. At least part of the excitation light emitted from the excitation light source 10 is used to excite the wavelength conversion material in the wavelength conversion element 40 so that the wavelength conversion material generates the excited light, and the wavelength conversion element 40 emits lambertian light when the excitation light is emitted. The wavelength conversion element 40 may further include a filter layer disposed on the light-emitting surface of the wavelength conversion layer, the filter layer being used for filtering light and obtaining light in a specified wavelength range. In this way, the excited light or the mixed light emitted through the wavelength conversion element 40 can enter the core layer 31 and the cladding layer 32 of the light guide element 30 at the same time, and the coupling efficiency of the excited light can be improved. Wherein the wavelength conversion material is prepared from fluorescent powder, fluorescent dye, quantum dot and adhesive. It is to be understood that the wavelength conversion material may be a material having wavelength conversion properties that are commonly used in the art, and the embodiments of the present invention are not limited thereto.

In some embodiments, the light source device 100 further includes a light splitting element 20. The spectroscopic element 20 is disposed on the optical path between the excitation light source 10 and the wavelength converting element 40. In the present embodiment, the light guiding member 30 is disposed on the optical path between the light splitting element 20 and the wavelength converting element 40. The light guiding element 30 also has a second end proximal to the light splitting element 20 and distal to the wavelength converting element 40. The light splitting element 20 is used for guiding the excitation light to the core layer 31 at the second end, and guiding the light beam emitted from the second end of the light guide element 30 to the emergent light path of the light source device 100. The core layer 31 is also used to deliver and homogenize the excitation light.

The spectroscopic element 20 includes a first region 21 and a second region 22. The first region 21 is provided in a central region of the light splitting element 20, and the second region 22 is provided in a region other than the central region. In some embodiments, the first region 21 is configured to transmit the excitation light, and the second region 22 is configured to reflect the excited light or mixed light emitted by the wavelength conversion element 40. In other embodiments, the first region 21 may be configured to reflect the excitation light, and the second region 22 may be configured to transmit the excited light or the mixed light emitted from the wavelength conversion element 40.

In the present embodiment, the first region 21 is configured as a through-hole structure 211. The through hole structure 211 faces the light guiding element 30. Specifically, the through hole structure 211 is disposed at a position of the first region 21 corresponding to the transmission path of the excitation light, so as to improve the light utilization rate of the excitation light.

In other embodiments, the first region 21 is configured to include a film layer that transmits the excitation light, and the first region 21 faces the light guide member 30. In this way, most of the excitation light emitted from the excitation light source 10 is transmitted through the first region 21 and enters the light guide member 30. Optionally, the first region 21 is further configured to reflect the excited light or the mixed light emitted from the wavelength conversion element 40.

In the present embodiment, the second region 22 is configured as a high reflection layer 220 to further improve the light utilization efficiency of the received laser light or the mixed light emitted from the wavelength conversion element 40. In some embodiments, the portion of the light splitting element 20 corresponding to the second region 22 is a film layer made of a highly reflective material. In some embodiments, the side of the second region 22 facing away from the excitation light source 10 is provided with a highly reflective layer 220 to save cost. The high reflection layer 220 contains a reflection material such as gold, silver, nickel, aluminum foil, or metal-plated polyester, polyimide film, or the like.

Since the excitation light emitted from the excitation light source 10 is lambertian, i.e., the central light intensity is especially large and the edge light intensity is small, when the excitation light emitted from the excitation light source 10 is emitted to the wavelength conversion element 40, the local heat of the wavelength conversion element 40 is large, and the light conversion efficiency of the wavelength conversion element 40 is reduced. Alternatively, in order to improve the light conversion efficiency of the wavelength converting element 40, the refractive index of the core layer 31 is greater than that of the cladding layer 32, and the refractive index of the cladding layer 32 is kept greater than that of air. The excitation light emitted from the excitation light source 10 can be totally internally reflected on the inner side wall 301 of the light guide element 30, so that the excitation light is homogenized and shaped by the core layer 31 of the light guide element 30, and the excitation light spot irradiated on the wavelength conversion element 40 is a uniform light spot, thereby avoiding the local heat of the wavelength conversion element 40 being higher due to the overhigh central illumination of the excitation light spot, and keeping the wavelength conversion element 40 at a higher light efficiency.

A gap is formed between the light guide element 30 and the wavelength conversion element 40, so that the received laser light enters the core layer 31 and the cladding layer 32 of the light guide element 30 as much as possible, and the received laser light or the mixed light emitted by the wavelength conversion element 40 can be totally internally reflected on the inner side wall 301 and the outer side wall 302 of the light guide element 30, that is, the received laser light or the mixed light emitted by the wavelength conversion element 40 after being excited is transmitted through the core layer 31 and the cladding layer 32 of the light guide element 30, that is, both the core layer 31 and the cladding layer 32 of the light guide element 30 can collect the received laser light or the mixed light emitted by the wavelength conversion element 40, thereby improving the light utilization rate of the light source device.

Optionally, the spacing of the gaps is such that the spot of the excitation light transmitted to the light guide element 30 is smaller than the cross-sectional area of the light guide element 30. For example, the Numerical Aperture (NA) of the light guide member 30 is 0.22, the side length of the core layer 31 of the light guide member 30 is 0.4mm, the diameter of the cladding layer 32 of the light guide member 30 is 0.6mm, and the gap is smaller than 0.07mm, so that the spot incident to the wavelength converting member 40 is smaller than 0.6 mm.

The first predetermined shape is a square or polygon, and the second predetermined shape is a circle or square, so that the light source device 100 can illuminate light spots with predetermined shapes, and the light source device 100 can meet different application fields. Specifically, as shown in fig. 2, in the present embodiment, the first predetermined outer shape is a square shape, that is, the cross section of the core layer 31 is a square shape, and the second predetermined outer shape is a circular shape, that is, the outer shape of the cross section of the cladding layer 32 is a circular shape, so that the light source device 100 can form a circular illumination spot. It will be appreciated that in other embodiments, as shown in fig. 3, the cross-sectional profile of the cladding 32a of the light-guiding element 30a may also be square or polygonal, so that the light source arrangement is capable of forming a square or polygonal illumination spot. Therefore, the cross section of the cladding is designed into different shapes to meet the application requirements of different occasions.

In some embodiments, the light source device 100 further comprises a lens 50. The lens 50 is disposed on the optical path between the light splitting element 20 and the light guiding element 30. The lens 50 is used to collect the excitation light emitted by the light splitting element 20 and collimate the excited light or the mixed light emitted by the wavelength conversion element 40. Specifically, the excitation light emitted from the excitation light source 10 is converged into the core layer 31 through the lens 50, the excitation light has a small divergence angle, and can be totally internally reflected in the core layer 31 (i.e., the inner side wall 301 of the light guide element 30), the light is totally internally emitted inside the core layer 31 for multiple times, a virtual light source image is formed by each reflection, and the virtual light source image is reflected for multiple times to form a two-dimensional virtual light source matrix, so that the light emission is more uniform, and the core layer 31 can homogenize and shape the excitation light. Therefore, after the excitation light is transmitted to the end surface of the light guide element 30, a light beam with uniform optical power density distribution can be formed, and the light beam is irradiated to the wavelength conversion element 40, so that the phenomenon that the local temperature of the wavelength conversion element 40 is too high due to too high central optical power density and the light conversion efficiency is reduced can be avoided.

The light guiding element 30 comprises at least one core layer 31, and the refractive index of the core layer 31 is higher the closer to the centerline of the light guiding element 30. Specifically, as shown in fig. 4, in the present embodiment, the light guide member 30b includes a first core layer 311b, a second core layer 312b, and a clad layer 32 b. The first core layer 311b and the second core layer 312b and the clad layer 32b are coaxially disposed, and the second core layer 312b is located between the first core layer 311b and the clad layer 32 b. The refractive index of the second core layer 312b is smaller than that of the second core layer 311b and larger than that of the cladding layer 32 b.

The light-guiding member 30 comprises at least one cladding layer 32, and the refractive index of the cladding layer 32 is higher the closer to the centerline of the light-guiding member 30. As shown in fig. 5, in some embodiments, the light guiding element 30c includes a core layer 31c, a first cladding layer 321c, and a second cladding layer 322 c. The core layer 31c, the first cladding layer 321c, and the second cladding layer 322c are coaxially disposed, and the first cladding layer 321c is located between the core layer 31c and the second cladding layer 322 c. The refractive index of the first cladding 321c is greater than that of the second cladding 322c and less than that of the core layer 31 c.

It is understood that the number of stages of the core layer and the clad layer may be designed according to the actual situation, for example, the core layer includes a first core layer and N second core layers (N >1, and N is a positive integer), the N second core layers being disposed between the first core layer and the clad layer. The refractive index of the N second core layers is smaller than that of the first core layer and larger than that of the cladding layer. The clad layers include a first clad layer and M second clad layers (M >1, and M is a positive integer), the first clad layer being disposed between the M second clad layers and the core layer. The refractive index of the M second cladding layers is smaller than that of the first cladding layer and smaller than that of the core layer.

Referring to fig. 1, fig. 6A and fig. 6B, in the present embodiment, the width of the longitudinal section of the light guiding element 30 is consistent along the direction extending along the center line of the core layer 31, wherein the width of the longitudinal section of the light guiding element 30 is the distance between two opposite sides of the longitudinal section of the light guiding element 30 in the direction perpendicular to the center line of the core layer 31, that is, the longitudinal section of the light guiding element 30 is substantially rectangular. In particular, the light guiding element 30 is configured as a columnar structure.

Specifically, in one embodiment, as shown in fig. 1, the width of the longitudinal section of the core layer 31 is uniform along the direction in which the center line of the core layer 31 extends, and the width of each longitudinal section of the cladding layer 32 is uniform along the direction in which the center line of the core layer 31 extends. The width of the longitudinal section of the core layer 31 is the distance between two opposite sides of the longitudinal section of the core layer 31 in the direction perpendicular to the center line of the core layer 31, and the width of the longitudinal section of the cladding layer 32 is the distance between two opposite sides of each longitudinal section of the cladding layer 32 in the direction perpendicular to the center line of the core layer 31. Specifically, the core layer 31 is configured as a columnar structure, and the clad layer 32 is configured as a hollow columnar structure.

In another embodiment, as shown in fig. 6A, the width of the longitudinal section of the core layer 31d is configured such that the width of the end near the wavelength converting element 40 is smaller than the width of the end far from the wavelength converting element 40, and the width of each longitudinal section of the cladding layer 32d of the light guiding element 30d is configured such that the width of the end near the wavelength converting element 40 is larger than the width of the end far from the wavelength converting element 40. The core layer 31d is configured as a conical structure, and the cladding layer 32d is configured as a hollow columnar structure. Specifically, the width of the longitudinal section of the core layer 31d of the light guiding member 30d is configured such that the width near the end of the wavelength converting element 40 is increased toward the width far from the end of the wavelength converting element 40, and the width of each longitudinal section of the cladding layer 32d of the light guiding member 30d is configured such that the width near the end of the wavelength converting element 40 is decreased toward the width far from the end of the wavelength converting element 40.

Further, the core layer 31d of the light guide member 30d is in the form of a square cone, and the cladding layer 32d is in the form of a cylinder. As shown in fig. 6A and 6B, the end surface of the light guiding member 30d near the light splitting element 20 is substantially circular. The end surface of the core layer 31d close to the spectroscopic element 20 is square, the end surface of the cladding layer 32d close to the spectroscopic element 20 is circular, and the end surface of the cladding layer 32d close to the spectroscopic element 20 is located outside the end surface of the core layer 31d close to the spectroscopic element 20. A projection of the end face of the core layer 31d close to the wavelength converting element 40 in a direction parallel to the center line of the light guiding element 30d falls within the end face of the core layer 31d close to the light splitting element 20.

Alternatively, in other embodiments, the width of the longitudinal cross-section of the light guiding element may also be configured such that the width of the end near the wavelength converting element 40 is smaller than the width of the end remote from the wavelength converting element, i.e. the longitudinal cross-section of the light guiding element is substantially trapezoidal. Therefore, the core layer of the light guide element can not only homogenize and shape the received laser, but also reduce the area of the wavelength conversion device irradiated by the exciting light, so that the area of an exciting light spot on the wavelength conversion element is smaller, most of the received laser emitted by the wavelength conversion element can be collected by the light guide element, and the light utilization rate of the received laser is further improved. Furthermore, the stimulated light transmitted within the core layer may also be collimated by the light guide element.

Specifically, in some embodiments, as shown in fig. 7A, the width of the longitudinal section of the core layer 31e is configured such that the width of the end near the wavelength converting element 40 is smaller than the width of the end far from the wavelength converting element 40, and the width of each longitudinal section of the cladding layer 32e is configured such that the width of the end near the wavelength converting element 40 is smaller than the width of the end far from the wavelength converting element 40. In the present embodiment, the width of the longitudinal section of the core layer 31e is configured such that the width near the end of the wavelength converting element 40 is increased toward the width far from the end of the wavelength converting element 40, and the width of each longitudinal section of the cladding layer 32e is configured such that the width near the end of the wavelength converting element 40 is increased toward the width far from the end of the wavelength converting element 40. The core layer 31e is configured as a tapered structure, and the cladding layer 32e is configured as a hollow tapered structure.

Further, as shown in fig. 7A, the core layer 31e of the light guiding member 30e has a square cone shape, and the cladding layer 32e has a circular truncated cone shape. As shown in fig. 7A and 7B, the end surface of the light guiding member 30e near the light splitting element 20 is substantially circular. The end surface of the core layer 31e close to the spectroscopic element 20 is square, the end surface of the cladding layer 32e close to the spectroscopic element 20 is circular, and the end surface of the cladding layer 32e close to the spectroscopic element 20 is located outside the end surface of the core layer 31e close to the spectroscopic element 20. The projections of the end surface of the core layer 31e close to the wavelength converting element 40 and the end surface of the cladding layer 32e close to the wavelength converting element 40 in the direction parallel to the center line of the light guiding element 30e are both within the end surface of the core layer 31e close to the light splitting element 20.

In another embodiment, as shown in fig. 8A, the width of the longitudinal section of the core layer 31f is configured to be uniform in a direction extending along the center line of the core layer 31, and the width of each longitudinal section of the cladding layer 32f is configured such that the width near the end of the wavelength converting element 40 is increased toward the width far from the end of the wavelength converting element 40. The core layer 31f is configured as a columnar structure, and the cladding layer 32f is configured as a hollow conical structure.

Further, as shown in fig. 8A, the core layer 31f of the light guide member 30e is of a rectangular parallelepiped shape, and the cladding layer 32f is of a truncated cone shape. As shown in fig. 8A and 8B, one end surface of the light guiding member 30f near the light splitting element 20 is substantially circular. The end surface of the core layer 31f close to the spectroscopic element 20 is square, the end surface of the cladding layer 32f close to the spectroscopic element 20 is circular, and the end surface of the cladding layer 32f close to the spectroscopic element 20 is positioned outside the end surface of the core layer 31f close to the spectroscopic element 20. A projection of the end face of the core layer 31f close to the wavelength converting element 40 in a direction parallel to the center line of the light guiding element 30f overlaps with the end face of the core layer 31f close to the spectroscopic element 20.

The core layer 31g is configured as a conical structure, and the cladding layer 32g is configured as a hollow columnar structure. Referring to fig. 9A and 9B, in one embodiment, the core 31g of the light guide element 30g is square-cone shaped and the cladding 32g is cylindrical. One end surface of the light guide member 30g near the light splitting member 20 is substantially square. The end surface of the core layer 31g adjacent to the spectroscopic element 20 is square, and the end surface of the cladding layer 32g adjacent to the wavelength converting element 40 is circular. The projection of the end surface of the core layer 31g close to the wavelength converting element 40 and the end surface of the cladding layer 32g close to the wavelength converting element 40 in the direction parallel to the center line of the light guiding element 30g falls within the end surface of the core layer 31g close to the light splitting element 20.

The core layer 31h is configured as a conical structure, and the cladding layer 32h is configured as a hollow columnar structure. Referring to fig. 10A and 10B together, in one embodiment, the core layer 31h of the light guide element 30h is square-tapered and the cladding layer 32h is rectangular. One end surface of the light guide member 30h near the light splitting member 20 is substantially square. The end surface of the core layer 31h close to the spectroscopic element 20 is square, and the end surface of the cladding layer 32h close to the wavelength converting element 40 is square. A projection of the end surface of the core layer 31h close to the wavelength converting element 40 in a direction parallel to the center line of the light guiding element 30h falls within the end surface of the core layer 31h close to the light splitting element 20, and a projection of the end surface of the cladding layer 32h close to the wavelength converting element 40 in a direction parallel to the center line of the light guiding element 30h overlaps with the end surface of the core layer 31h close to the light splitting element 20.

Alternatively, in some embodiments, referring to fig. 11A to 13B together, the length of the

core layer

31i, 31j, 31k is greater than the length of the

cladding layer

32i, 32j, 32k, and the

core layer

31i, 31j, 31k and the

cladding layer

32i, 32j, 32k are flush at an end near the wavelength converting element 40. Optionally, the core layers 31i, 31j, 31k are exposed at a side of the

cladding layers

32i, 32j, 32k away from the wavelength converting element 40. Thus, on one hand, the

light guide elements

30i, 30j, 30k have improved collection efficiency for the excitation light and the stimulated light, and the light utilization rate of the light source device is higher, and on the other hand, the core layers 31i, 31j, 31k can enhance the light homogenizing and shaping of the excitation light, so that the light source device 100 emits an illumination spot with more uniform color and brightness.

Preferably, the exposed portion of the

core layer

31i, 31j, 31k is smoothly transitionally connected with the encapsulated portion of the

core layer

31i, 31j, 31k, so that the excitation light can be homogenized and shaped in the

core layer

31i, 31j, 31k of the

light guide element

30i, 30j, 30 k.

Wherein the size of the cross section of the

core layer

31i, 31j, 31k becomes gradually larger from the side close to the wavelength converting element 40 to the side exposed out of the

cladding layer

32i, 32j, 32k away from the wavelength converting element 40.

The core layer 31i is configured as a tapered structure, and the cladding layer 32i is configured as a hollow columnar structure. Specifically, referring to fig. 11A and 11B, in another embodiment, the core layer 31i of the light guide element 30i is square-cone-shaped, and the cladding layer 32i is cylindrical. The end surface of the light guiding member 30i near the light splitting member 20 is substantially square. The end surface of the core layer 31i near the spectroscopic element 20 is square, and the end surface of the cladding layer 32i near the wavelength converting element 40 is circular. Projections of both the end surface of the core layer 31i close to the wavelength converting element 40 and the end surface of the cladding layer 32i close to the wavelength converting element 40 in a direction parallel to the center line of the light guiding element 30i fall within the end surface of the core layer 31i close to the light splitting element 20.

Wherein, one end of the core layer 31j close to the wavelength conversion element 40 is configured into a cone-shaped structure, one end of the core layer 31j far from the wavelength conversion element 40 is configured into a cone-shaped structure, and the cladding layer 32j is configured into a hollow columnar structure. The clad layer 32j covers the tapered structure portion of the core layer 31 j. Specifically, referring to fig. 12A and 12B, in another embodiment, the core layer 31j covered by the cladding layer 32j is a square cone, the core layer 31j exposed out of the cladding layer 32j is a cylinder, and the cladding layer 32j is a rectangular prism. One end surface of the light guiding member 30j near the light splitting member 20 is substantially circular. The end surface of the core layer 31j adjacent to the spectroscopic element 20 is circular, and the end surface of the cladding layer 32j adjacent to the wavelength converting element 40 is circular. A projection of the end face of the core layer 31j close to the wavelength converting element 40 in a direction parallel to the center line of the light guiding element 30j falls within the end face of the core layer 31j close to the light splitting element 20. The projection of the end face of the clad layer 32j close to the wavelength converting element 40 in the direction parallel to the center line of the light guiding element 30j overlaps the end face of the core layer 31j close to the spectroscopic element 20.

The core layer 31k is configured as a tapered structure, and the cladding layer 32k is configured as a hollow columnar structure. Specifically, referring to fig. 13A and 13B, in another embodiment, the core layer 31k of the light guide element 30k is square-tapered and the cladding layer 32k is rectangular. One end surface of the light guiding member 30k near the light splitting member 20 is substantially square. The end surface of the core layer 31k near the spectroscopic element 20 is square, and the end surface of the cladding layer 32k near the wavelength converting element 40 is square. The projection of the end surface of the core layer 31k close to the wavelength converting element 40 and the end surface of the cladding layer 32k close to the wavelength converting element 40 in the direction parallel to the center line of the light guiding element 30k falls within the end surface of the core layer 31k close to the light splitting element 20.

Here, one end of the core layer 31n close to the wavelength converting element 40 is configured as a tapered structure, one end of the core layer 31n far from the wavelength converting element 40 is configured as a tapered structure, and the cladding layer 32n is configured as a hollow columnar structure. The clad layer 32n covers the tapered structure portion of the core layer 31 n. Specifically, referring to fig. 14A and 14B, in another embodiment, the core layer 31n covered by the cladding layer 32n is a square cone, the core layer 31n exposed from the cladding layer 32n is a cylinder, and the cladding layer 32k is a rectangular prism. One end surface of the light guide member 30n near the light splitting member 20 is substantially circular. The end surface of the core layer 31n near the spectroscopic element 20 is circular, and the end surface of the cladding layer 32n near the wavelength converting element 40 is square. A projection of the end face of the core layer 31n close to the wavelength converting element 40 in a direction parallel to the center line of the light guiding member 30k falls within the end face of the core layer 31n close to the light splitting element 20.

It will be appreciated that in the light guide structure described in fig. 9A to 14B, the cladding layer may also be of a square tapered shape, with the taper of the cladding layer being less than that of the core layer.

As shown in fig. 15A to 17B, in the distribution diagram of the light spots on the end surface of the light guide element near the light splitting element obtained by modeling simulation, it can be seen that the color and brightness of the light spots are uniform, and therefore, the illumination light spots generated by the light source device 100 of the present invention have a uniform brightness distribution.

Specifically, fig. 15A and 15B are distribution diagrams of light spots at the end face of the light guide member 30g near the spectroscopic element 20 obtained by modeling simulation, in the present embodiment, the core layer 31g of the light guide member 30g has a square cone shape, and the cladding layer 32g has a hollow cylindrical shape. Fig. 16A and 16B are distribution diagrams of light spots at the end surface of the light guide member 30h near the spectroscopic element 20 obtained by modeling simulation, in the present embodiment, the core layer 31h of the light guide member 30h has a square cone shape, and the cladding layer 32h has a hollow rectangular column structure. Fig. 17A and 17B are light spot distribution diagrams at the end surface of the light guide element 30j near the spectroscopic element 20 obtained by modeling simulation, in this embodiment, the core layer 31j covered by the cladding layer 32j is in a square cone shape, the core layer 31j exposed to the cladding layer 32j is in a cylinder shape, and the cladding layer 32j is in a hollow rectangular column-shaped structure. One end of the core layer 31j close to the wavelength conversion element 40 is configured into a conical structure, one end of the core layer 31j far away from the wavelength conversion element 40 is configured into a cylindrical structure, the cladding layer 32j is configured into a hollow rectangular column structure, and the cladding layer 32j covers the conical structure part of the core layer 31 j.

According to the light source device provided by the embodiment of the invention, based on the fact that the core layer has the first preset shape and the cladding layer has the second preset shape, the illumination light spots with preset shapes can be formed, and the light source device can meet different application fields. In addition, the excited light or the mixed light of the excited light and the non-excited excitation light emitted by the wavelength conversion element is transmitted through the core layer and the cladding layer of the light guide element, that is, the core layer can be used for transmitting and homogenizing the excited light or the mixed light emitted to the core layer at the first end through the wavelength conversion element, and the cladding layer can be used for transmitting and homogenizing the excited light or the mixed light emitted to the cladding layer at the first end through the wavelength conversion element. The core layer and the cladding layer of the light guide element can collect the excited light and the mixed light emitted by the wavelength conversion element, so that the light utilization rate of the light source device is improved. In addition, excitation light emitted by the excitation light source is homogenized through the core layer of the light guide element, so that excitation light spots irradiated on the wavelength conversion element are uniform spots, the phenomenon that the local heat of the wavelength conversion element is high due to the fact that the central illumination of the excitation light spots is too high is avoided, and the wavelength conversion element keeps high light efficiency.

Referring to fig. 18, fig. 18 is a schematic structural diagram of a light source device 200 according to another embodiment of the present invention. The light source device 200 includes an excitation light source 10, a light guide member 30, and a wavelength conversion device 40. The structure of the illumination apparatus 200 is similar to that of the illumination device 100. In contrast, the light source device 200 further includes the reflective cup 20a, and does not include the light splitting element 20 and the lens 50.

Wherein the reflective cup 20a is disposed on the optical path between the excitation light source 10 and the wavelength conversion element 40. The reflector cup 20a is used for guiding the excitation light to the wavelength conversion element 40, and guiding the light beam emitted from the wavelength conversion element 40 to the core layer 31 and the cladding layer 32 at the first end. The core layer 31 and the cladding layer 32 also serve to deliver and homogenize the excitation light.

In the present embodiment, the outer shape of the reflective cup 20a is different from the outer shape of the light splitting element 20. The reflector cup 20a is substantially bowl-shaped. The opening of the reflector cup 20a is directed towards the light guiding element 30 and the wavelength converting element 40. Specifically, the inner side surface 220a of the reflector cup 20a is an arc-shaped arcuate surface that is curved inward with respect to the reflector cup 20a to form a concave surface, and forms a curved reflecting surface (e.g., a spherical reflecting surface or an ellipsoidal reflecting surface) of the reflector cup 20 a. In this way, the received laser light or the mixed light emitted through the wavelength conversion device 40 can be more intensively irradiated to the core layer 31 and the clad layer 32 of the light guide member 30, and the light utilization efficiency of the light source device 200 is improved.

Specifically, when the curved reflective surface of the reflective cup 20a is ellipsoidal, the curved reflective surface can reflect light from near one focal point to near another focal point, and in this case, it is necessary to set the incident position of the excitation light generated by the excitation light source 10 on the wavelength conversion element 40 near the one focal point and set the light inlet of the light guide element 30 near the another focal point. When the curved reflection surface of the reflection cup 20a is spherical, two symmetrical points symmetrical with respect to the center of the sphere are disposed at positions close to the center of the sphere, and the curved reflection surface can reflect light from one of the symmetrical points to the other symmetrical point, it is necessary to dispose the incident position of the excitation light generated by the excitation light source 10 on the wavelength conversion element 40 near the one symmetrical point, and dispose the light entrance of the light guide element 30 near the other symmetrical point.

The light-guiding element 30 and the wavelength conversion device 40 are both arranged on the side of the reflective cup 20a facing away from the excitation light source 10. In an embodiment, the wavelength conversion device 40 is a reflective wavelength conversion element, and the light guiding element 30 and the wavelength conversion device 40 are arranged offset, e.g. the light guiding element 30 and the wavelength conversion device 40 are arranged in parallel. At this time, the wavelength conversion device 40 may convert all or part of the received excitation light into the stimulated light on the side close to the excitation light source 10 and emit the stimulated light on the side close to the excitation light source 10.

In other embodiments, the wavelength conversion device 40 is a transmissive wavelength conversion element and the light guide element 30 faces the wavelength conversion device 40, i.e., the wavelength conversion device 40 is disposed in the optical path between the reflective cup 20a and the light guide element 30. At this time, the side of the wavelength conversion device 40 close to the excitation light source 10 may convert the received excitation light at least partially into excited light, and emit mixed light including the excited light and the excitation light that is not excited simultaneously at the side away from the excitation light source 10.

Wherein the reflective cup 20a is disposed on the optical path between the excitation light source 10 and the wavelength conversion element 40. The reflector cup 20a includes a third region 21a and a fourth region 22 a. The third region 21a is provided in the central region of the reflector cup 20a, and the fourth region 22a is provided in a region other than the central region. The third region 21a is configured to transmit the excitation light, and the fourth region 22a is configured to reflect the excited light or the mixed light emitted from the wavelength converting element 40 to the light guiding element 30.

In the present embodiment, the excitation light at least partially transmits through the third region 21a of the reflector cup 20a to the wavelength conversion device 40, and excites the excited light through the wavelength conversion device 40. The excited light is received by the third region 21a and/or the fourth region 22a of the reflector cup 20a and is converged to the light guide element 30, and finally the light guide element 30 receives the excited light and the rest of the excited light.

In some embodiments, the light source device 100 can be applied to a projection system. The light source device 100 has the structure and function in each of the above embodiments. The projection system may employ various projection technologies such as liquid crystal display projection technology, digital light path processor projection technology. Further, the light source device 100 described above can be applied to a lighting system, such as a stage lighting system.

The above embodiments of the present invention are described in detail, and the principle and the implementation of the present invention are explained by applying specific embodiments, and the above description of the embodiments is only used to help understanding the method of the present invention and the core idea thereof; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in view of the above, the content of the present specification should not be construed as a limitation to the present invention.

Claims

1. A light source device, comprising:

an excitation light source for generating excitation light;

a wavelength conversion element for converting at least part of the received excitation light into stimulated light and emitting the stimulated light or mixed light of the stimulated light and the unexcited excitation light; and

the light guide element is arranged on a light path of the emitted laser or mixed light of the wavelength conversion element, and comprises a core layer and a cladding layer, wherein the cladding layer is arranged outside the core layer, the core layer is provided with a first preset appearance, the cladding layer is provided with a second preset appearance, the light guide element is provided with a first end close to the wavelength conversion element, the core layer is used for transmitting and homogenizing the emitted laser or mixed light of the wavelength conversion element on the core layer of the first end, and the cladding layer is used for transmitting and homogenizing the emitted laser or mixed light of the wavelength conversion element on the cladding layer of the first end.

2. The light source device according to claim 1, further comprising a light splitting element disposed in a light path between the excitation light source and the light guide element, the light guide element further having a second end close to the light splitting element and remote from the wavelength conversion element, the light splitting element being configured to guide the excitation light to a core layer of the second end and guide a light beam emitted from the second end of the light guide element to an exit light path of the light source device, the core layer being further configured to transfer and homogenize the excitation light.

3. The light source device according to claim 2, wherein the light splitting element includes a first region and a second region, the first region being disposed in a central region of the light splitting element, the second region being disposed in a region other than the central region, the first region being configured to transmit the excitation light, the second region being configured to reflect the excited light or the mixed light emitted from the wavelength conversion element; alternatively, the first region is configured to reflect the excitation light, and the second region is configured to transmit the excited light or the mixed light emitted from the wavelength conversion element.

4. The light source device according to claim 2, wherein: the light source device further comprises a lens, the lens is arranged on a light path between the light splitting element and the light guide element, the lens is used for converging the excitation light to the core layer of the second end, and collimating and guiding the light beam emitted from the second end of the light guide element to the light splitting element.

5. The light source device according to claim 1, further comprising a reflective cup disposed on an optical path between the excitation light source and the wavelength conversion element, the reflective cup being configured to guide the excitation light to the wavelength conversion element and guide a light beam emitted from the wavelength conversion element to a core layer and a cladding layer at the first end, the core layer and the cladding layer being further configured to transfer and homogenize the excitation light.

6. The light source device according to claim 5, wherein the reflector cup includes a third region and a fourth region, the third region is disposed in a central region of the reflector cup, the fourth region is disposed in a region other than the central region, the third region is configured to transmit the excitation light, and the fourth region is configured to reflect the excited light or the mixed light emitted from the wavelength conversion element to the light guide element.

7. The light source device according to claim 1, wherein a refractive index of the core layer is larger than a refractive index of the clad layer, and the refractive index of the clad layer is larger than a refractive index of the air.

8. The light source device according to claim 7, wherein the light guide member includes at least one of the core layer and at least one of the clad layers, wherein the refractive index of the core layer closer to a center line of the light guide member is higher, and the refractive index of the clad layer closer to the center line of the light guide member is higher.

9. The light source device according to claim 1, wherein a width of a longitudinal section of the light guide member is uniform in a direction in which a center line of the core layer extends, wherein the width of the longitudinal section of the light guide member is a distance between two opposite sides of the longitudinal section of the light guide member in a direction perpendicular to the center line of the core layer.

10. The light source device according to claim 9, wherein a width of the longitudinal section of the core layer, which is a distance between two opposite sides of the longitudinal section of the core layer in a direction perpendicular to the center line of the core layer, is configured to be uniform in a direction extending along the center line of the core layer or to be smaller near an end of the wavelength conversion element than far from the end of the wavelength conversion element.

11. The light source device according to claim 1, wherein a width of a longitudinal section of the light guide member is configured such that a width of an end close to the wavelength converting element is smaller than a width of an end far from the wavelength converting element, wherein the width of the longitudinal section of the light guide member is a distance between two opposite sides of the longitudinal section of the light guide member in a direction perpendicular to a center line of the core layer.

12. The light source device according to claim 11, wherein a width of the longitudinal section of the core layer, which is a distance between two opposite sides of the longitudinal section of the core layer in a direction perpendicular to the center line of the core layer, is configured to be uniform in a direction extending along the center line of the core layer or to be smaller near an end of the wavelength conversion element than far from the end of the wavelength conversion element.

13. A light source device according to any one of claims 10 or 12, wherein the core layer has a length greater than that of the cladding layer, and the core layer and the cladding layer are flush at an end adjacent to the wavelength converting element.

14. The light source device according to claim 1, wherein the first predetermined outer shape is a square or a polygon, and the second predetermined outer shape is a circle or a square.