CN114879375B

CN114879375B - Light splitting and combining device and electronic equipment

Info

Publication number: CN114879375B
Application number: CN202110162543.3A
Authority: CN
Inventors: 梁廷玮; 黄柏元
Original assignee: Sintai Optical Shenzhen Co Ltd; Asia Optical Co Inc
Current assignee: Sintai Optical Shenzhen Co Ltd; Asia Optical Co Inc
Priority date: 2021-02-05
Filing date: 2021-02-05
Publication date: 2024-01-19
Anticipated expiration: 2041-02-05
Also published as: CN114879375A

Abstract

The invention relates to a light splitting and combining device and electronic equipment, wherein the light splitting and combining device comprises a first prism and a second prism which are mutually jointed: the first prism includes: the first surface is used for allowing light rays in a first wavelength range to pass through; a second face; a third face; the second prism includes: a fourth surface for passing light rays of the second wavelength range; a fifth surface bonded to the second surface, and a first optical film coated between the fifth surface and the second surface, the first optical film passing light beams of a first wavelength range and reflecting light beams of a second wavelength range; the sixth surface is used for allowing the light rays in the first wavelength range and the second wavelength range to pass through and for reflecting the light rays in the third wavelength range; the light rays in the first wavelength range can pass through the first surface, the second surface, the first optical film, the fifth surface and the sixth surface in sequence or in reverse sequence; light rays in the second wavelength range can pass through the fourth surface, reach the fifth surface, be reflected by the first optical film and pass through the sixth surface in sequence or in reverse sequence; light in the third wavelength range can be reflected by the sixth surface.

Description

Light splitting and combining device and electronic equipment

Technical Field

The present invention relates to the field of optics, and more particularly, to a light splitting and combining device and an electronic apparatus.

Background

Fig. 1 is a schematic diagram of a conventional LCOS (Liquid Crystal on Silicon ) projector 1. The light emitted by the light source 11 of the projector 1 is divided into red, green and blue light by the dichroic mirrors 12 and 13, and then the red, green and blue light respectively passes through the corresponding polarization beam splitting prisms 14, 15 and 16, and is reflected to the corresponding LCOS panels 17, 18 and 19, the red, green and blue light is respectively changed in polarity by the LCOS panels 17, 18 and 19, and then reflected back to the corresponding polarization beam splitting prisms 14, 15 and 16, and finally is synthesized by the light combining prism 10 and emitted from the projection lens.

Fig. 2 is a schematic view of the light combining prism 10 in fig. 1. As shown in fig. 2, the light combining prism 10 is formed by joining four prisms 10a, 10b, 10c, 10d, and there are apertures at the joint a of the four prisms, and the red, green and blue three-color light will be incident on the joint a during the combination, and the joint a will cause imaging errors, affecting the imaging quality.

Fig. 3 is a schematic diagram of a prior art DLP (Digital Light Processing ) projector 20. The light emitted from the light source 21 of the projector 20 is split into red, green and blue light by the splitting and combining prism 23 after passing through the total reflection prism 22, and then the red, green and blue light is reflected back to the splitting and combining prism 23 after passing through the corresponding digital micromirror elements (Digital Micromirror Device, DMD) respectively, and is emitted from the projection lens 24 after being combined.

The splitting and combining prism 23 is formed by joining three prisms, and the three prisms are arranged in a staggered manner, so that incident light does not pass through the joint of the three prisms, but the volume and the weight of the prism are too large to be miniaturized, and the overall volume of the projector 20 is too large.

Disclosure of Invention

The invention aims to solve the technical problem that the imaging quality is affected or the size is overlarge due to the existence of pores at the joint of the light splitting and combining device in the prior art, and provides the light splitting and combining device which can avoid the pores formed by the joint.

The technical scheme adopted for solving the technical problems is as follows: a light splitting and combining device is constructed, comprising a first prism and a second prism which are mutually jointed: the first prism includes: the first surface is used for allowing light rays in a first wavelength range to pass through; a second face; a third face; the second prism includes: a fourth surface for passing light rays of the second wavelength range; a fifth surface bonded to the second surface, and a first optical film coated between the fifth surface and the second surface, the first optical film passing the light beam in the first wavelength range and reflecting the light beam in the second wavelength range; the sixth surface is used for allowing the light rays in the first wavelength range and the second wavelength range to pass through and for reflecting the light rays in the third wavelength range; the light rays in the first wavelength range can pass through the first face, the second face, the first optical film, the fifth face and the sixth face in sequence or in reverse sequence, or pass through the first face and the third face in sequence or in reverse sequence; the light in the third wavelength range can be reflected by the sixth surface.

The invention provides a light splitting and combining device, which comprises a first prism and a second prism which are mutually jointed: the first prism includes: the first surface is used for allowing light rays in a first wavelength range to pass through; a second face; a third face;

the second prism includes: a fourth face; a fifth surface, which is attached to the second surface, and a first optical film is plated between the fifth surface and the second surface, wherein the first optical film passes light beams in a first wavelength range and is used for reflecting light beams in a second wavelength range; a sixth face; wherein the first surface and the second surface are at an angle of 45 degrees, the fourth surface is perpendicular to the first surface, the fifth surface and the fourth surface are at an angle of 45 degrees, and the sixth surface and the first surface are at an angle of 45 degrees.

The invention provides a light splitting and combining device, which comprises a prism, wherein the prism comprises: the first surface is used for allowing light rays in a first wavelength range to pass through and light rays in a second wavelength range to reflect; the second surface is used for incidence of light rays in a second wavelength range; and a third surface for passing the light rays in the first wavelength range and reflecting the light rays in the third wavelength range. The light rays in the first wavelength range can pass through the first surface and the third surface sequentially or reversely; the light rays in the second wavelength range can pass through the second surface, reach the first surface and be reflected by the first surface in sequence or in reverse sequence; the light in the third wavelength range is capable of being reflected by the third face.

According to the light splitting and combining device, the third surface is parallel to or in the same plane as the sixth surface, and the third surface is used for allowing the light rays in the first wavelength range to pass through and reflecting the light rays in the third wavelength range; another part of the light rays in the first wavelength range can pass through the first surface and the third surface sequentially or reversely; another portion of the light in the third wavelength range is reflected by the third face.

According to the light splitting and combining device, the light splitting and combining device further comprises a third prism, and the third prism comprises: a seventh surface for passing light rays of the third wavelength range; a eighth face attached to the sixth face with a second optical film interposed therebetween, the second optical film passing light rays of the first wavelength range and reflecting light rays of the third wavelength range; a ninth surface for passing light rays in the first, second and third wavelength ranges; the third surface is parallel to or in the same plane as the sixth surface, and is used for allowing the light rays in the first wavelength range to pass through and reflecting the light rays in the third wavelength range; the third prism further includes: a tenth surface for passing light rays of the second wavelength range; and a tenth surface for passing light rays in the first wavelength range and reflecting light rays in the second wavelength range.

According to the light splitting and combining device of the present invention, the light in the first wavelength range can pass through the first surface, the third surface, the tenth surface, the ninth surface in sequence or in reverse sequence, and/or can pass through the first surface, the second surface, the first optical film, the fifth surface, the sixth surface, the second optical film, the eighth surface and the ninth surface in sequence or in reverse sequence; the light rays of the second wavelength range can pass through the tenth face, be reflected by the eleventh face, pass through the ninth face, and/or can pass through the fourth face, reach the fifth face, be reflected by the first optical film, pass through the sixth face, pass through the second optical film, pass through the eighth face, pass through the ninth face in order or in reverse order; the light rays of the third wavelength range can be reflected by the third face, through the tenth face, through the ninth face, in order or in reverse order, or can be sequentially or in reverse order through the seventh face, to the eighth face, reflected by the second optical film, through the ninth face.

According to the light splitting and combining device, the light splitting and combining device further comprises a third prism, and the third prism comprises: a seventh surface for passing light rays of the third wavelength range; a third surface, which is bonded to the third surface, and between which a second optical film is coated, the second optical film passing light rays in the first wavelength range and reflecting light rays in the third wavelength range; and a ninth surface for passing light in the first wavelength range and reflecting light in the second wavelength range; the third surface is parallel to or in the same plane as the sixth surface, and is used for allowing the light rays in the first wavelength range to pass through and reflecting the light rays in the third wavelength range; the light rays in the first wavelength range can pass through the first surface, the second surface, the first optical film, the fifth surface and the sixth surface in sequence or in reverse sequence; or can pass through the first surface, the third surface, the second optical film, the eighth surface and the ninth surface sequentially or in reverse order; the light rays in the second wavelength range can pass through the fourth surface, be reflected by the first optical film between the fifth surface and the second surface and pass through the sixth surface in sequence or in reverse sequence; or can be reflected on the ninth face; the light rays in the third wavelength range can pass through the seventh surface, be reflected by the second optical film between the eighth surface and the third surface and pass through the ninth surface in sequence or in reverse sequence; or can be reflected by said sixth face.

According to the light splitting and combining device, the first prism is in a quadrangular pyramid shape, and the first surface is the bottom surface of the first prism; the second prism is triangular pyramid; the third prism is triangular pyramid; the ninth face is parallel to or in the same plane as the fifth face.

According to the light splitting and combining device of the present invention, the first prism is in a shape of a four-prism, and further comprises: a seventh surface for passing light in the second wavelength range; and a eighth face through which light in a third wavelength range passes; the second prism is in a triangular prism shape and further comprises a ninth surface for passing light rays in a third wavelength range; a part of the light rays in the first wavelength range can pass through the first surface, the second surface, the first optical film, the fifth surface and the sixth surface in sequence or in reverse sequence; another part of the light rays in the first wavelength range and another part of the light rays in the first wavelength range can pass through the first surface and the third surface sequentially or reversely; the light rays in the second wavelength range can pass through the first surface, be reflected by the first optical film between the second surface and the fifth surface and pass through the seventh surface in sequence or in reverse sequence; a portion of the light in the third wavelength range is capable of passing through the first face, being reflected by the third face, and passing through the eighth face, either sequentially or in reverse order.

According to the light splitting and combining device, the light splitting and combining device further comprises a fourth prism, and the fourth prism comprises: a second surface for passing light in a second wavelength range; a tenth surface bonded to the eleventh surface, a third optical film being plated between the tenth surface and the eleventh surface, the third optical film passing light rays in the first wavelength range and reflecting light rays in the second wavelength range; a tenth surface for passing the light rays in the first wavelength range and reflecting the light rays in the second wavelength range; a tenth surface bonded to the third surface, a fourth optical film being coated between the tenth surface and the third surface, the fourth optical film passing light rays in the first wavelength range and reflecting light rays in the third wavelength range; the light rays in the first wavelength range can pass through the first surface, the second surface, the first optical film, the fifth surface, the sixth surface, the second optical film, the eighth surface and the ninth surface in sequence or in reverse sequence; and/or can pass through the first, third, fourth, tenth, third, eleventh, and ninth faces in order or in reverse order; the light rays in the second wavelength range can pass through the fourth face, reach the fifth face, be reflected by the first optical film, pass through the sixth face, pass through the second optical film, pass through the eighth face and pass through the ninth face in sequence or in reverse sequence; or can pass through the tenth surface, be reflected by the third optical film between the tenth and eleventh surfaces, pass through the ninth surface in either order or in reverse order; the light rays in the third wavelength range can pass through the seventh surface, reach the eighth surface, be reflected by the second optical film and pass through the ninth surface in sequence or in reverse sequence; or can pass through the tenth face, be reflected by the fourth optical film between the tenth and third faces, pass through the tenth face, pass through the ninth face in either order or in reverse order.

According to the light splitting and combining device, the first prism is in a quadrangular pyramid shape, and the first surface is the bottom surface of the first prism; the second prism is triangular pyramid; the third prism is in a quadrangular pyramid shape, and the ninth surface is the bottom surface of the third prism; the fourth prism is a triangular pyramid.

According to the light splitting and combining device of the present invention, the light in the first wavelength range, the light in the second wavelength range and the light in the third wavelength range do not overlap with each other in wavelength ranges and at least one of the following conditions is satisfied: the third wavelength range is different from each other by 20nm or more, and is not interposed between the first wavelength range and the second wavelength range.

The invention also provides a projector, which comprises a light source, the light splitting and combining device, a spatial light modulator and a projection lens.

The invention also provides a head-mounted display assembly which comprises a light source, the light splitting and combining device and the projection lens.

The invention also provides a head-up display assembly which comprises a light source, a projection lens, a reflecting mirror, a spatial light modulator and the light splitting and combining device.

The light splitting and combining device has the following beneficial effects: the light beam is incident on each surface without passing through the holes formed by the joints of the prisms, so that the influence of the incidence of the light beam on the image caused by the holes can be avoided, and the size and the weight are smaller, thereby being beneficial to the overall miniaturization.

Drawings

The invention will be further described with reference to the accompanying drawings and examples, in which:

fig. 1 is a schematic diagram of a conventional LCOS projector.

Fig. 2 is a schematic view of the light combining prism in fig. 1.

Fig. 3 is a schematic diagram of a prior art DLP projector.

Fig. 4A, 4B, and 4C are a schematic structural view, an exploded schematic view, and an optical path schematic view of a light splitting and combining device according to a first embodiment of the present invention;

fig. 5A, 5B, 5C are a schematic structural view, an exploded schematic view, and an optical path schematic view of a light splitting and combining device according to a second embodiment of the present invention;

fig. 6A is a schematic structural diagram of a light splitting and combining device according to a third embodiment of the present invention;

fig. 6B is an exploded view of a light splitting and combining device according to a third embodiment of the present invention;

FIG. 6C is a schematic view of the optical paths of light rays in the first and second wavelength ranges of the light splitting and combining device according to the third embodiment of the present invention;

FIG. 6D is a schematic diagram illustrating the optical path of light in a third wavelength range of the light splitting/combining device according to the third embodiment of the present invention;

fig. 6E is a schematic optical path diagram of a light splitting and combining device according to a third embodiment of the present invention;

fig. 7A, 7B, and 7C are a schematic structural view, an exploded schematic view, and an optical path schematic view of a light splitting and combining device according to a fourth embodiment of the present invention;

Fig. 8A is a schematic structural diagram of a light splitting and combining device according to a fifth embodiment of the present invention;

fig. 8B is an exploded view of a light splitting and combining device according to a fifth embodiment of the present invention;

FIG. 8C is a schematic view of the optical paths of light rays in the first and second wavelength ranges of the light splitting and combining device according to the fifth embodiment of the present invention;

fig. 8D is a schematic diagram of an optical path of light in a third wavelength range of the light splitting and combining device according to the fifth embodiment of the present invention;

fig. 8E is a schematic optical path diagram of a light splitting and combining device according to a fifth embodiment of the present invention;

fig. 9A, 9B, 9C are a schematic structural view, an exploded schematic view, and an optical path schematic view of a light splitting and combining device according to a sixth embodiment of the present invention;

fig. 10A, 10B, and 10C are a schematic structural view, an exploded schematic view, and a schematic light path view of a light splitting and combining device according to a seventh embodiment of the present invention;

fig. 11A, 11B, and 11C are a schematic structural view, an exploded schematic view, and an optical path schematic view of a light splitting and combining device according to an eighth embodiment of the present invention;

fig. 12A is a schematic structural view of a light splitting and combining device according to a ninth embodiment of the present invention;

fig. 12B is an exploded view of a light splitting and combining device according to a ninth embodiment of the present invention;

Fig. 12C is a schematic view of optical paths of light rays of first and second wavelength ranges of the light splitting and combining device according to the ninth embodiment of the present invention;

fig. 12D is a schematic view of an optical path of light in a third wavelength range of the light splitting and combining device according to the ninth embodiment of the present invention;

fig. 12E is a schematic optical path diagram of a light splitting and combining device according to a ninth embodiment of the present invention;

fig. 13A, 13B, and 13C are a schematic structural view, an exploded schematic view, and an optical path schematic view of a light splitting and combining device according to a tenth embodiment of the present invention, respectively.

Fig. 14A and 14B are a schematic structural view and a schematic optical path view of a light splitting and combining device according to an eleventh embodiment of the present invention, respectively.

Detailed Description

The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.

Fig. 4A, 4B, and 4C are a schematic structural view, an exploded schematic view, and an optical path schematic view of the light splitting and combining device 100 according to the first embodiment of the present invention. As shown in fig. 4A to 4C, in this embodiment, the light splitting and combining device 100 includes a first prism 110 and a second prism 120 that are coupled to each other. Wherein the first prism 110 includes: a first surface 1101 for allowing light of a first wavelength range to pass along a first direction X; the second surface 1102 can pass light rays in the first wavelength range and reflect light rays in the second wavelength range; and a third surface 1103 for passing light in the first wavelength range and reflecting light in the third wavelength range. The second face 1102 and the third face 1103 are adjacent to each other, and projections along the first direction X all fall within the range of the first face 1101.

The second prism 120 includes: fourth side 1201, through which light in the second wavelength range may pass; the fifth surface 1202 and the second surface 1102 are attached to each other, and can allow the light in the first wavelength range to pass through and reflect the light in the second wavelength range; and a sixth surface 1203 for passing light in the first and second wavelength ranges and reflecting light in the third wavelength range. Fourth face 1201, fifth face 1202, sixth face 1203 abut each other. The third face 1103 may be parallel to or in the same plane as the sixth face 1203 and parallel to the second direction Y.

Wherein the second side 1102 and the fifth side 1202 may be bonded together by gluing or the like, with the first optical film 1104 sandwiched between the second side 1102 and the fifth side 1202. The first optical film 1104 may be coated on the second surface 1102 or the fifth surface 1202, so that the second surface 1102 or the fifth surface 1202 can reflect light in the second wavelength range. The first optical film 1104 passes light in a first wavelength range and reflects light in a second wavelength range. The sixth surface 1203 is configured to allow light in the first wavelength range and the second wavelength range to pass therethrough, and reflect light in the third wavelength range, and this is achieved by plating an optical film on the sixth surface. Wherein the light rays of the first wavelength, the second wavelength, and the third wavelength range may respectively correspond to one of the following wavelength ranges: purple 380-450nm; blue 450-475nm; cyan 476-495nm; green 495-570nm; yellow 570-590nm; orange 590-620nm; the red 620-750nm, preferably, the first wavelength, the second wavelength and the third wavelength range may not be limited to the above visible light range, as long as the three do not overlap and any one of the following is satisfied: the range of the third wavelength is different from each other by 20nm or more, and is not between the range of the first wavelength and the range of the second wavelength.

The optical path of this first embodiment is described below:

in the illustrated embodiment, light in a first wavelength range enters the first surface 1101 from the first direction X and passes through, and the light in the first wavelength range sequentially passes through the second surface 1102, the first optical film 1104, the fifth surface 1202, the sixth surface 1203 and exits along the first direction X; light rays of the second wavelength range are incident from the fourth face 1201 and pass through in the second direction Y, then reflected on the first optical film 1104 between the second face 1102 and the fifth face 1202, reach the sixth face 1203, and exit in the first direction X after passing through. Light rays of the third wavelength range are incident on the sixth surface 1203 along the third direction Z and are reflected and then exit along the first direction X. Thus, light combination of light rays in the first, second and third wavelength ranges is realized.

When all the light beams travel in the opposite directions, the combined light beams are incident on the sixth surface 1203 along the first direction X, and the light beams in the first wavelength range pass through the sixth surface 1203, then sequentially pass through the fifth surface 1202, the first optical film 1104, the second surface 1102, the first surface 1101, and exit along the first direction X. Light rays of the second wavelength range pass through the sixth surface 1203, then reach the fifth surface 1202 and are reflected by the first optical film 1104, and then exit from the fourth surface 1201 along the second direction Y. The light in the third wavelength range is reflected by the sixth surface 1203 and exits along the third direction Z. This is achieved by splitting the composite beam into light rays of a first, a second and a third wavelength range.

When the range of the incident light is relatively large or the size of the light splitting and combining device 100 is relatively small, the incident light of the first wavelength range and the third wavelength range may reach multiple surfaces at the same time. At this time, the light in the first wavelength range enters the first surface 1101 from the first direction X and passes through, and a part of the light passes through the second surface 1102, the first optical film 1104, the fifth surface 1202, the sixth surface 1203 in order and exits along the first direction X; another part of the light passes through the third face 1103 and exits along the first direction X. Light rays of the second wavelength range are incident from the fourth face 1201 and pass through in the second direction Y, then reflected on the first optical film 1104 between the second face 1102 and the fifth face 1202, reach the sixth face 1203, and exit in the first direction X after passing through. A part of the light rays in the third wavelength range are incident on the sixth surface 1203 along the third direction Z and reflected and then exit along the first direction X, and another part of the light rays in the third wavelength range are incident on the third surface 1103 along the third direction Z and reflected and then exit along the first direction X. The light rays in the first wavelength range, the light rays in the second wavelength range and the reflected light rays in the third wavelength range form a combined light beam and are emitted, so that the light combination of the light rays in the first wavelength range, the light rays in the second wavelength range and the light rays in the third wavelength range is realized. In the above embodiment, the light may not pass through the third face 1103.

When all the light beams travel reversely, the combined light beams are incident on the sixth surface 1203 and the third surface 1103 along the first direction X, a part of light rays in the first wavelength range pass through the sixth surface 1203, then sequentially pass through the fifth surface 1202, the first optical film 1104, the second surface 1102 and the first surface 1101, and are emitted along the first direction X; another part of the light rays of the first wavelength range passes through the third surface 1103 and then exits from the first surface 1101 along the first direction X. Light rays of the second wavelength range pass through the sixth surface 1203, then reach the fifth surface 1202 and are reflected by the first optical film 1104, and then exit from the fourth surface 1201 along the second direction Y. A portion of the light rays of the third wavelength range are reflected by the sixth surface 1203 and exit along the third direction Z, and another portion of the light rays of the third wavelength range are reflected by the third surface 1103 and exit along the third direction Z, thus realizing the division of the combined light beam into the light rays of the first, second and third wavelength ranges.

In the embodiment shown in fig. 4A-4C, the first prism 110 may be a quadrangular pyramid, with the first face 1101 being the bottom face thereof. The second prism 120 has a triangular pyramid shape. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other, and an angle of 45 degrees is formed between the first surface 1101 and the second surface 1102, and an angle of 45 degrees is also formed between the first surface 1101 and the third surface 1103. Fourth face 1201 is perpendicular to first face 1101, and fifth face 1202 is at a 45 degree angle to fourth face 1201. The sixth face 1203 is angled 45 degrees from the first face 1101. However, the present invention is not limited thereto, and the angle between the respective surfaces may be changed, and the light combination and the light splitting of the light rays in the first, second and third wavelength ranges may be realized in cooperation with the change of the incident direction of the light rays. The forms of the first prism 110 and the second prism 120 may also be changed.

The light splitting and combining device 100 in this embodiment includes only the first prism 110 and the second prism 120, and the two prisms 110 and 120 are joined to each other by the second surface 1102 and the fifth surface 1202, so that only the aperture is formed at the three corners of the first prism 110 and the second prism 120, the light is incident on each surface, the influence of the light incident on the aperture on the image can be avoided, the volume and the weight are small, and the overall miniaturization is facilitated.

Fig. 5A, 5B, and 5C are a schematic structural diagram, an exploded schematic diagram, and an optical path schematic diagram of a light splitting and combining device 200 according to a second embodiment of the present invention. As shown in fig. 5A to 5C, this second embodiment is a modification of the first embodiment. In this embodiment, the light splitting and combining device 200 includes a first prism 210 and a second prism 220, and the structure of the light splitting and combining device is mirror-symmetrical to the light splitting and combining device 100 in the first embodiment with respect to the first direction X, and other identical or similar parts will not be described herein.

Fig. 6A is a schematic structural diagram of a light splitting and combining device 300 according to a third embodiment of the present invention; fig. 6B is an exploded view of a light splitting and combining device 300 according to a third embodiment of the present invention; fig. 6C is a schematic diagram of the optical paths of the light rays of the first and second wavelength ranges of the light splitting and combining device 300 according to the third embodiment of the present invention; fig. 6D is a schematic diagram of an optical path of a light ray in a third wavelength range of the light splitting and combining device 300 according to the third embodiment of the present invention; fig. 6E is a schematic optical path diagram of a light splitting and combining device 300 according to a third embodiment of the present invention. This third embodiment is a modification of the first embodiment, and the same or similar parts as those of the first embodiment will not be described again. As shown in fig. 6A to 6E, in this embodiment, the light splitting and combining device 300 includes a first prism 310, a second prism 320, and a third prism 330 that are coupled to each other. Wherein the first prism 310 includes: a first face 3101 through which light in a first wavelength range passes; a second surface 3102 for passing light in the first wavelength range and reflecting light in the second wavelength range; and a third surface 3103 through which light of the first wavelength range passes and which is reflective to light of the third wavelength range, the second surface 3102 and the third surface 3103 being adjacent to each other, and projections along the first direction X all falling within the range of the first surface 3101.

The second prism 320 includes: fourth face 3201 for passing light in the second wavelength range; the fifth surface 3202 and the second surface 3102 are adhered to each other, and can allow the light in the first wavelength range to pass through and reflect the light in the second wavelength range; and a sixth surface 3203 for passing light in the first and second wavelength ranges and for reflecting light in the third wavelength range; the fourth face 3201, the fifth face 3202, the sixth face 3203 abut each other.

The third prism 330 may be a quadrangular pyramid shape including: seventh face 3301, through which light in the third wavelength range passes; eighth face 3302, which is attached to sixth face 3203 and faces seventh face 3301, and which allows light in the first and second wavelength ranges to pass therethrough and allows light in the third wavelength range to reflect; a ninth surface 3303 for passing light rays of the first, second and third wavelength ranges, the ninth surface 3303 being a bottom surface of the third prism 330; tenth face 3304 for light in the second wavelength range to pass through; and an eleventh face 3305 opposite to the tenth face 3304, the eleventh face 3305 being capable of passing light rays of the first and third wavelength ranges and reflecting light rays of the second wavelength range. The projections of the seventh face 3301, the eighth face 3302, the tenth face 3304, and the eleventh face 3305 along the first direction X fall within the range of the ninth face 3303.

Wherein the second face 3102 and the fifth face 3202 are adhered to each other and may be bonded together by gluing or the like. A first optical film 3104 is coated between the second face 3102 and the fifth face 3202. The first optical film 3104 may be coated on the second surface 3102 or may be coated on the fifth surface 3202. The first optical film 3104 passes the light beam of the first wavelength range, and reflects the light beam of the second wavelength range.

Sixth side 3203 and eighth side 3302 are attached to each other and may be bonded together by means of gluing or the like. A second optical film 3306 is sandwiched between the sixth surface 3203 and the eighth surface 3302. The second optical film 3306 may be coated on the sixth surface 3203 or the eighth surface 3302, so that the sixth surface 3203 or the eighth surface 3302 can reflect light in a third wavelength range. The second optical film 3306 passes light rays of the first and second wavelength ranges, and reflects light rays of the third wavelength range.

Fourth face 3201 may be parallel to or in the same plane as tenth face 3304. Eleventh face 3305 is parallel to or in the same plane as fifth face 3202. The sixth face 3203 is parallel or in the same plane as the third face 3103 and is parallel to the direction in which light of the second wavelength range passes through the fourth face 1201. In fig. 6C, eleventh face 3305 and fifth face 3202 (or second face 3102), both of which are reflective surfaces for light of the second wavelength range and parallel to third direction Z, are shown in bold lines; in fig. 6D, sixth surface 3203 (or eighth surface 3302) and third surface 3103, which are both reflective surfaces for light of the third wavelength range and parallel to second direction Y, are shown with bold lines.

The optical path of this third embodiment is described below:

in the illustrated embodiment, light in the first wavelength range is incident on the first face 1101 from the first direction X and passes through, sequentially passes through the second face 3102, the first optical film 3104, the fifth face 3202, the sixth face 3203, the second optical film 3306, the eighth face 3302, and exits from the ninth face 3303 along the first direction X. Light rays of the second wavelength range are incident from the fourth surface 3201 and pass through along the second direction Y, then reflected on the first optical film 3104, sequentially pass through the sixth surface 3203, the second optical film 3306, the eighth surface 3302, and exit from the ninth surface 3303 along the first direction X. Light rays in the third wavelength range enter the seventh face 3301 from the third direction Z, then reach the eighth face 3302, are reflected by the second optical film 3306, and finally exit from the ninth face 3303 along the first direction X. When the composite beam travels reversely, the light in the first wavelength range sequentially passes through the ninth surface 3303, the eighth surface 3302, the second optical film 3306, the sixth surface 3203, the fifth surface 3202, the first optical film 3104, the second surface 3102, and finally exits from the first surface 3303 along the first direction X. Light rays of the second wavelength range sequentially pass through the ninth face 3303, the eighth face 3302, the second optical film 3306, and the sixth face 3203, then reflect on the first optical film 3104 between the second face 3102 and the fifth face 3202, and exit from the fourth face 3201 along the second direction Y. The light in the third wavelength range passes through the ninth surface 3303 and the eighth surface 3302, is reflected by the second optical film 3306 to the seventh surface 3301, and finally exits from the seventh surface 3301 along the third direction Z.

When the range of the incident light is relatively large or the size of the light splitting and combining device 100 is relatively small, the incident light may reach multiple surfaces at the same time. At this time, in the illustrated embodiment, a part of the light in the first wavelength range is incident on the first surface 3101 from the first direction X and passes through, in order, the second surface 3102, the first optical film 3104, the fifth surface 3202, the sixth surface 3203, the second optical film 3306, the eighth surface 3302, and exits from the ninth surface 3303 along the first direction X, and another part of the light in the first wavelength range is incident on the third surface 3103 from the first direction X and passes through, then passes through the eleventh surface 3305, and finally exits from the ninth surface 3303 along the first direction X.

A portion of the light rays of the second wavelength range are incident and pass through the fourth surface 3201 along the second direction Y, then are reflected on the first optical film 3104, sequentially pass through the sixth surface 3203, the second optical film 3306, the eighth surface 3302, and exit from the ninth surface 3303 along the first direction X, and another portion of the light rays of the second wavelength range are incident and pass through the tenth surface 3304 along the second direction Y, then are reflected on the eleventh surface 3305, and finally exit from the ninth surface 3303 along the first direction X.

A portion of the light in the third wavelength range enters the seventh face 3301 along the third direction Z, passes through, reaches the eighth face 3302, is reflected by the second optical film 3306 to the ninth face 3303, and finally exits from the ninth face 3303 along the first direction X. Another portion of the light in the third wavelength range is incident on the third surface 3103 along the third direction Z, then is reflected by the third surface 3103 onto the eleventh surface 3305 and passes through, and finally the ninth surface 3303 exits along the first direction X. Thus, light combination of light rays in the first, second and third wavelength ranges is realized.

When all the light rays reversely travel, the composite light beam enters through the ninth face 3303, a part of the light rays in the first wavelength range sequentially pass through the eighth face 3302, the second optical film 3306, the sixth face 3203, the fifth face 3202, the first optical film 3104 and the second face 3102, and finally exit from the first face 3303 along the first direction X; another portion of the light rays in the first wavelength range sequentially pass through the ninth face 3303, the eleventh face 3305, and the third face 3103, and finally exit from the first face 3303 along the first direction X. A portion of the light in the second wavelength range sequentially passes through the ninth face 3303, the eighth face 3302, the second optical film 3306, the sixth face 3203, and then is reflected on the first optical film 3104 between the second face 3102 and the fifth face 3202, and exits from the fourth face 3201 along the second direction Y. Another portion of the light in the second wavelength range passes through the ninth face 3303, then reflects on the eleventh face 3305, and finally exits from the tenth face 3304 along the second direction Y. A portion of the light in the third wavelength range passes through the ninth face 3303, then passes through the eleventh face 3305, reaches the third face 3103, and is reflected by the third face 3103 along the third direction Z. Another portion of the light in the third wavelength range passes through the ninth face 3303, then reaches the eighth face 3302, and is reflected by the second optical film 3306, and finally exits from the seventh face 3301 along the third direction Z. This is achieved by splitting the composite beam into light rays of a first, a second and a third wavelength range. In the above embodiments, the light may not pass through the third surface 1103 or may not pass through the second prism 120.

In the embodiment shown in fig. 6A-6E, first prism 310 is a quadrangular pyramid and first face 3101 is its bottom face. The second prism 320 has a triangular pyramid shape. The third prism 330 has a quadrangular pyramid shape, and the ninth surface 3303 has a bottom surface thereof. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other, and an angle of 45 degrees is formed between the first surface 3101 and the second surface 3102, and an angle of 45 degrees is also formed between the first surface 3101 and the third surface 3103. Fourth face 3201 is perpendicular to first face 3101, and sixth face 3203 is angled 45 degrees from first face 3101. The seventh face 3301 is angled 90 degrees from the first face 3101; an angle of 45 degrees between the eighth face 3302 and the first face 3101; ninth face 3303 is parallel to first face 3101; tenth face 3304 is perpendicular to first face 3101.

However, the present invention is not limited thereto, and the angle between the respective surfaces may be changed in combination with the change of the incident direction of the light to achieve the light combination and light splitting of the light in the first, second and third wavelength ranges. The forms of the first prism 310, the second prism 320, and the third prism 330 may also be changed.

Fig. 7A, 7B, and 7C are a schematic structural view, an exploded schematic view, and an optical path schematic view of a light splitting and combining device 400 according to a fourth embodiment of the present invention; this fourth embodiment is a modification of the third embodiment, as shown in fig. 7A to 7C. In this embodiment, the light splitting and combining device 400 includes a first prism 410, a second prism 420 and a third prism 430, and the structure of the light splitting and combining device is mirror symmetrical to the light splitting and combining device 300 in the first embodiment with respect to the first direction X, and other identical or similar parts will not be described herein.

Fig. 8A is a schematic structural diagram of a light splitting and combining device 500 according to a fifth embodiment of the present invention; fig. 8B is an exploded view of a light splitting and combining device 500 according to a fifth embodiment of the present invention; fig. 8C is a schematic diagram of the optical paths of the light rays of the first and second wavelength ranges of the light splitting and combining device 500 according to the fifth embodiment of the present invention; fig. 8D is a schematic diagram of an optical path of light in a third wavelength range of the light splitting and combining device 500 according to the fifth embodiment of the present invention; fig. 8E is a schematic optical path diagram of a light splitting and combining device 500 according to a fifth embodiment of the present invention. This fifth embodiment is a modification of the first embodiment, and the same or similar parts as those of the first embodiment will not be described again. As shown in fig. 8A to 8E, in this embodiment, the light splitting and combining device 500 includes a first prism 510, a second prism 520, and a third prism 530. Wherein the first prism 510 includes: the first surface 5101 is capable of allowing light rays in a first wavelength range to pass therethrough; the second surface 5102 is capable of allowing light rays in the first wavelength range to pass through and light rays in the second wavelength range to reflect; and the third surface 5103 may allow light of the first wavelength range to pass therethrough and reflect light of the third wavelength range, the second surface 5102 and the third surface 5103 are adjacent to each other, and projections along the first direction X are all within the range of the first surface 5101.

The second prism 520 includes: fourth face 5201 for passing light in the second wavelength range; the fifth surface 5202 and the second surface 5102 are adhered to each other, and can allow light rays in the first wavelength range to pass through and reflect light rays in the second wavelength range; and a sixth face 5203 for passing light in the first and second wavelength ranges and for reflecting light in the third wavelength range. The fourth surface 5201, the fifth surface 5202 and the sixth surface 5203 are adjacent to each other.

The third prism 530 includes: seventh face 5301 for allowing light in the third wavelength range to pass therethrough; eighth face 5302, which is attached to third face 5103, is capable of allowing light in the first wavelength range to pass therethrough and reflecting light in the third wavelength range; ninth face 5303 is configured to allow light in the first and third wavelength ranges to pass therethrough and to reflect light in the second wavelength range.

Wherein the second side 5102 and the fifth side 5202 are attached to each other and can be bonded together by gluing or the like. A first optical film 5104 is plated between the second side 5102 and the fifth side 5202. The first optical film 5104 may be plated on the second side 5102 or on the fifth side 5202. The first optical film 5104 passes light rays of a first wavelength range and reflects light rays of a second wavelength range. The sixth surface 5203 is capable of passing light in the first and second wavelength ranges and reflecting light in the third wavelength range, and this is achieved by coating the sixth surface with an optical film.

The third face 5103 and the eighth face 5302 are bonded to each other, and may be bonded together by gluing or the like. A second optical film 5305 is coated between the third face 5103 and the eighth face 5302. The second optical film 5305 may be coated on the third surface 5103 or may be coated on the eighth surface 5302, so that the third surface 5103 or the eighth surface 5302 may be provided for to reflect light in the third wavelength range. The second optical film 5305 transmits light in the first wavelength range and reflects light in the third wavelength range.

Ninth face 5303 is parallel to or in the same plane as fifth face 5202. The sixth face 5203 is parallel to or in the same plane as the third face 5103. In fig. 8C, the ninth surface 5303 and the fifth surface 5202 (or the second surface 5102), both of which are reflective surfaces for light of the second wavelength range and parallel to the third direction Z, are shown in bold lines; in fig. 6D, a sixth face 5203 and a third face 5103 (or eighth face 5302) are shown in bold lines, both of which are reflective surfaces for light rays of the third wavelength range and parallel to the second direction Y.

In the illustrated embodiment, a portion of the light in the first wavelength range enters the first surface 5101 from the first direction X and passes through, sequentially passes through the second surface 5102, the first optical film 5104, the fifth surface 5202, and exits from the sixth surface 5203 along the first direction X, and another portion of the light in the first wavelength range enters the third surface 5103 from the first direction X and passes through, then passes through the second optical film 5305, the eighth surface 5302, and finally exits from the ninth surface 5303 along the first direction X.

Light of the second wavelength range is incident along the second direction Y, a portion is incident from the fourth face 5201 and passes through, and then is reflected on the first optical film 5104 between the second face 5102 and the fifth face 5202, passes through the sixth face 5203, and exits along the first direction X. The other part is reflected on the ninth face 5303 and exits along the first direction X.

Light rays in the third wavelength range enter along the third direction Z, and a part of the light rays reach the seventh surface 5301 and pass through the seventh surface 5301, reach the eighth surface 5302, are reflected by the second optical film 5305 to the ninth surface 5303, and finally exit from the ninth surface 5303 along the first direction X; the other part is reflected by the sixth surface 5203 and exits along the first direction X, thus achieving the light combination of the light rays of the first, second and third wavelength ranges.

When all the light beams travel reversely, a part of the combined light beams are incident on the ninth surface 5303, wherein the light beams in the first wavelength range are incident on the eighth surface 5302 through the ninth surface 5303, pass through the eighth surface 5302, the second optical film 5305 and the third surface 5103, and finally exit from the first surface 5101; wherein light in the second wavelength range is reflected by the ninth surface 5303 and exits along the second direction Y. The light in the third wavelength range passes through the ninth surface 5303, reaches the eighth surface 5302, is reflected by the second optical film 5305, and finally exits from the seventh surface 5301. This is achieved by splitting the composite beam into light rays of a first, a second and a third wavelength range. Another part of the combined light beam is incident on the sixth surface 5203, wherein light rays in the first wavelength range sequentially pass through the sixth surface 5203, the fifth surface 5202, the first optical film 5104, the second surface 5102 and the first surface 5101 and are emitted along the first direction X; wherein light in the second wavelength range passes through the sixth face 5203, reaches the fifth face 5202 and is reflected by the first optical film 5104, and finally exits from the fourth face 5201 along the second direction Y; wherein light in a third wavelength range is reflected by the sixth surface 5203 and exits along the third direction Z. However, the present invention is not limited thereto, and the optical path of the embodiment may be the same as that of the first embodiment or may not pass through the second prism 520.

In the embodiment shown in fig. 8A-8C, the first prism 510 may be a quadrangular pyramid, with the first face 5101 being its bottom face. The second prism 520 has a triangular pyramid shape. The third prism 530 has a triangular pyramid shape. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other, and an angle of 45 degrees is formed between the first surface 5101 and the second surface 5102, and an angle of 45 degrees is also formed between the first surface 5101 and the third surface 5103. Fourth face 5201 is perpendicular to first face 5101 and sixth face 5203 is angled 45 degrees from first face 5101. Seventh surface 5301 is perpendicular to first surface 5101 and fourth surface 5201, and eighth surface 5302 is at an angle of 45 degrees to seventh surface 5301.

However, the present invention is not limited thereto, and the angle between the respective surfaces may be changed, and the light combination and the light splitting of the light rays in the first, second and third wavelength ranges may be realized in cooperation with the change of the incident direction of the light rays. The forms of the first prism 510, the second prism 520, and the third prism 530 may be changed.

Fig. 9A, 9B, and 9C are a schematic structural view, an exploded schematic view, and an optical path schematic view of a light splitting and combining device 600 according to a sixth embodiment of the present invention. As shown in fig. 9A to 9C, this sixth embodiment is a modification of the fifth embodiment. In this embodiment, the light splitting and combining device 600 includes a first prism 610, a second prism 620 and a third prism 630, and the structure of the light splitting and combining device is mirror symmetrical to the light splitting and combining device 500 in the fifth embodiment with respect to the first direction X, and other identical or similar parts will not be described herein.

Fig. 10A, 10B, and 10C are a schematic structural view, an exploded schematic view, and an optical path schematic view of a light splitting and combining device 700 according to a seventh embodiment of the present invention. As shown in fig. 10A to 10C, this seventh embodiment is a modification of the first embodiment, and the same or similar parts as those of the first embodiment will not be described again. In this embodiment, the light splitting and combining device 700 has the same structure as that of the first embodiment, and includes a first prism 710 and a second prism 720 coupled to each other. Wherein the first prism 710 includes: a first face 7101 through which light in the first, second, and third wavelength ranges passes; a second face 7102 through which light in the first wavelength range passes and which reflects light in the second wavelength range; a third surface 7103 through which light in the first wavelength range passes and which reflects light in a third wavelength range; a seventh face 7105 through which light in the second wavelength range passes; eighth face 7106 is configured to pass light in the third wavelength range. The second face 7102 and the third face 7103 are adjacent to each other, and projections along the first direction X are each within the range of the first face 7101. The second prism 720 includes: fourth face 7201; a fifth face 7202, which is bonded to the second face 7102, for allowing light in the first wavelength range to pass therethrough and for reflecting light in the second wavelength range; a sixth face 7203 for allowing light in the first wavelength range to pass therethrough and for reflecting light in the third wavelength range; and a ninth face 7204 for passing light in a third wavelength range. The fourth, fifth and sixth faces 7201, 7202, 7203 adjoin one another.

Wherein the second face 7102 and the fifth face 7202 may be bonded together by gluing or the like, with the first optical film 7104 sandwiched between the second face 7102 and the fifth face 7202. The first optical film 7104 may be plated on the second side 7102, or may be plated on the fifth side 7202. The first optical film 7104 passes light beams of a first wavelength range and reflects light beams of a second wavelength range. The sixth surface 7203 allows light in the first and second wavelength ranges to pass therethrough and reflects light in the third wavelength range, which can be achieved by plating an optical film on the sixth surface 7203.

The third face 7103 may be parallel to or in the same plane as the sixth face 7203 and parallel to the direction of light of the second wavelength range as it passes through the seventh face 7105. The third face 7103 is configured to pass light in the first wavelength range and reflect light in the third wavelength range, and this is achieved by coating the third face 7103 with an optical film.

In this embodiment, the incident/outgoing directions of the light rays of the first, second, and third wavelength ranges, and the combined light beam are opposite to those of the first embodiment.

Light rays of the first wavelength range enter the sixth face 7203 from the first direction X and pass through, then pass through the fifth face 7202, the first optical film 7104, the second face 7102 in sequence, and finally exit from the first face 7101 along the first direction X. Light of a second wavelength is incident on the seventh face 7105 from the second direction Y, then reflected on the first optical film 7104 between the second face 7102 and the fifth face 7202, and finally exits from the first face 7101 along the first direction X. Light rays of the third wavelength range enter the ninth face 7204 along the third direction Z, pass through the sixth face 7203 and are reflected by the sixth face 7203, then sequentially pass through the fifth face 7202, the first optical film 7104 and the second face 7102, and finally exit from the first face 7101 along the first direction X.

When all the light beams travel in the reverse direction, the combined light beam is incident from the first face 7101 along the first direction X, and the light rays of the first wavelength range sequentially pass through the first face 7101, the second face 7102, the first optical film 7104, the fifth face 7202, and finally exit from the sixth face 7203 along the first direction X. After passing through the first face 7101, light rays of the second wavelength range reflect off the first optical film 7104 between the second face 7102 and the fifth face 7202 and exit the seventh face 7105 in a second direction. Light rays of the third wavelength range pass through the first face 7101, then pass through the second face 7102, the first optical film 7104, the fifth face 7202, and are reflected by the sixth face 7203, and finally exit the ninth face 7204 along the third direction Z.

When the range of the incident light is relatively large or the size of the light splitting and combining device 100 is relatively small, the incident light may reach multiple surfaces at the same time. At this time, the light of the first wavelength range is incident on the first face 1101 from the first direction X and passes through. A portion of the light rays of the first wavelength range enter the sixth face 7203 from the first direction X and pass through, then pass through the fifth face 7202, the first optical film 7104, the second face 7102 in that order, and finally exit the first face 7101 along the first direction X; another portion of the light rays of the first wavelength range enter the third face 7103 from the first direction X and pass through, and then exit along the first direction X from the first face 7101. Light of a second wavelength is incident on the seventh face 7105 from the second direction Y, then reflected on the first optical film 7104 between the second face 7102 and the fifth face 7202, and finally exits from the first face 7101 along the first direction X. A portion of the light rays of the third wavelength range enter the eighth face 7106 along the third direction Z, pass through to the third face 7103 and are reflected by the third face 7103, and finally exit from the first face 7101 along the first direction X. Another portion of the light rays in the third wavelength range enter the ninth plane 7204 along the third direction Z, pass through the sixth plane 7203 and are reflected by the sixth plane 7203, then sequentially pass through the fifth plane 7202, the first optical film 7104 and the second plane 7102, and finally exit from the first plane 7101 along the first direction X.

When all the light beams travel in the opposite directions, the composite light beam enters from the first face 7101 along the first direction X, a part of the light rays in the first wavelength range sequentially pass through the first face 7101, the second face 7102, the first optical film 7104 and the fifth face 7202, and finally exits from the sixth face 7203 along the first direction X; after another portion of the light in the first wavelength range passes through the first face 7101, it exits from the third face 7103 along the first direction X. After passing through the first face 7101, light rays of the second wavelength range reflect off the first optical film 7104 between the second face 7102 and the fifth face 7202 and exit the seventh face 7105 along the second direction Y. A portion of the light in the third wavelength range passes through the first face 7101 and reflects off the third face 7103 before exiting the eighth face 7106 along the third direction Z; another portion of the light in the third wavelength range passes through the first face 7101, then passes through the second face 7102, the first optical film 7104, the fifth face 7202, and is reflected by the sixth face 7203, and finally exits the ninth face 7204 along the third direction Z.

In this embodiment, the first prism 710 may have a quadrangular pyramid shape, and the first face 7101 is a bottom face thereof. The second prism 720 has a triangular pyramid shape.

Fig. 11A, 11B, and 11C are a schematic structural view, an exploded schematic view, and an optical path schematic view of a light splitting and combining device 800 according to an eighth embodiment of the present invention. As shown in fig. 11A to 11C, this eighth embodiment is a modification of the seventh embodiment. In this embodiment, the light splitting and combining device 800 includes a first prism 810 and a second prism 820, and the structure of the light splitting and combining device is mirror symmetrical to the light splitting and combining device 700 in the first embodiment with respect to the first direction X, and other identical or similar parts will not be described herein.

Fig. 12A is a schematic structural diagram of a light splitting and combining device 900 according to a ninth embodiment of the present invention; fig. 12B is an exploded view of a light splitting and combining device 900 according to a ninth embodiment of the present invention; fig. 12C is a schematic view of the optical paths of the light rays of the first and second wavelength ranges of the light splitting and combining device 900 according to the ninth embodiment of the present invention; fig. 12D is a schematic diagram of an optical path of a light ray in a third wavelength range of the light splitting and combining device 900 according to the ninth embodiment of the present invention; fig. 12E is a schematic optical path diagram of a light splitting and combining device 900 according to a ninth embodiment of the present invention. The ninth embodiment is a modification of the fourth and fifth embodiments, and the same or similar parts as those of the fifth embodiment will not be described again. As shown in fig. 12A to 12C, in this embodiment, the light splitting and combining device 900 includes a first prism 910, a second prism 920, a third prism 930, and a fourth prism 940. Wherein the first prism 910 includes: a first surface 9101 for allowing light in a first wavelength range to pass therethrough; a second face 9102 through which light of the first wavelength range passes; and a third surface 9103 adjacent to the second surface 9102, the third surface 9103 being configured to allow light in the first wavelength range to pass therethrough and to reflect light in the third wavelength range. Wherein the projections of the second face 9102 and the third face 9103 in a direction perpendicular to the first face 9101 (i.e., the first direction X) are within the range of the first face 9101.

The second prism 920 includes: fourth face 9201 for passing light in the second wavelength range; the fifth surface 9202 and the second surface 9102 are adhered to each other, and can allow the light in the first wavelength range to pass through and reflect the light in the second wavelength range; and a sixth plane 9203 through which light in the first and second wavelength ranges passes and which is reflective to light in the third wavelength range; the fourth surface 9201, the fifth surface 9202, and the sixth surface 9203 are adjacent to each other.

The third prism 330 may be a quadrangular pyramid shape including: a seventh face 9301 for passing light in a third wavelength range; a eighth face 9302, which is attached to the sixth face 9203 and faces the seventh face 9301, for allowing light in the first and second wavelength ranges to pass therethrough and for reflecting light in the third wavelength range; a ninth surface 9303 for allowing light in the first, second, and third wavelength ranges to pass therethrough, the ninth surface 9303 being a bottom surface of the third prism 930; a tenth face 9304 for allowing light in a second wavelength range to pass therethrough; and an eleventh face 9305 opposite the tenth face 9304, the eleventh face 9305 being transparent to light in the first and third wavelength ranges and reflective to light in the second wavelength range. The projections of the seventh face 9301, the eighth face 9302, the tenth face 9304, and the eleventh face 9305 along the first direction X all fall within the range of the ninth face 9303.

The fourth prism 940 includes: a twelfth face 9401 for passing light in the third wavelength range; the thirteenth surface 9402 and the eleventh surface 9305 are attached to each other to allow the light in the first and third wavelength ranges to pass therethrough and to allow the light in the second wavelength range to reflect; a fourteenth surface 9403 for allowing light in the first wavelength range to pass therethrough and for reflecting light in the second wavelength range; and a fifteenth surface 9404, which is bonded to the third surface 9103, for allowing light in the first wavelength range to pass therethrough and for reflecting light in the third wavelength range.

Wherein the second face 9102 and the fifth face 9202 are bonded to each other and may be bonded together by gluing or the like. A first optical film 9104 is plated between the second face 9102 and the fifth face 9202. The first optical film 9104 may be coated on the second surface 9102 or may be coated on the fifth surface 9202. First optical film 9104 passes light in a first wavelength range and reflects light in a second wavelength range.

The sixth surface 9203 and the eighth surface 9302 are attached to each other and may be bonded together by gluing or the like. A second optical thin film 9306 is plated between the sixth surface 9203 and the eighth surface 9302. The second optical thin film 9306 may be plated on the sixth surface 9203 or on the eighth surface 9302. The second optical film 9306 passes light in the first wavelength range and reflects light in the third wavelength range.

The thirteenth face 9402 and the eleventh face 9305 are attached to each other and may be bonded together by gluing or the like. A third optical film 9405 is disposed between the thirteenth surface 9402 and the eleventh surface 9305, and the third optical film 9405 may be disposed on the thirteenth surface 9402 or on the eleventh surface 9305, so that the eleventh surface 9305 or the thirteenth surface 9402 reflects light in the second wavelength range. The third optical film 9405 transmits light in the first wavelength range and reflects light in the second wavelength range.

The fifteenth face 9404 and the third face 9103 are bonded to each other, and may be bonded together by gluing or the like. A fourth optical film 9406 is plated between fifteenth face 9404 and third face 9103. The fourth optical film 9406 can be coated on the fifteenth surface 9404 or on the third surface 9103, so that the third surface 9103 or the fifteenth surface 9404 can reflect light in the third wavelength range. The fourth optical film 9406 passes light in the first wavelength range and reflects light in the third wavelength range.

Fourth face 9201 may be parallel to or in the same plane as tenth face 9304. The eleventh face 9305 is parallel to or in the same plane as the fifth face 9202. The sixth surface 9203 is parallel to or in the same plane as the third surface 9103 and is parallel to the direction of light in the second wavelength range when light passes through the fourth surface 9201. In fig. 12C, an eleventh face 9305 (or thirteenth face 9402) and a fifth face 9202 (or second face 9102), both of which are reflective surfaces for light in the second wavelength range and parallel to the third direction Z, are shown in bold lines; in fig. 12D, a sixth face 9203 (or eighth face 9302) and a third face 9103 (or fifteenth face 9404), both of which are reflective surfaces for light in the third wavelength range and parallel to the second direction Y, are shown with bold lines.

The optical path of this ninth embodiment is described below:

light rays in the first wavelength range enter the first surface 9101 from the first direction X, pass through the second surface 9102, the first optical film 9104, the fifth surface 9202, the sixth surface 9203, the second optical film 9306, and the eighth surface 9302 in this order, and finally exit from the ninth surface 9303. Light rays of the second wavelength range are incident along the second direction Y, pass through the fourth surface 9201, then reflect on the first optical film 9104 between the second surface 9102 and the fifth surface 9202, pass through the sixth surface 9203, the second optical film 9306, and the eighth surface 9302, and finally exit from the ninth surface 9303 along the first direction. Light rays of the third wavelength range enter along the third direction Z, reach the seventh face 9301 and pass through, then reach the eighth face 9302, and are reflected by the second optical film 9306 to the ninth face 9303, then exit along the first direction X through the ninth face 9303.

When all the light beams travel reversely, the combined light beam is incident from the ninth face 9303 along the first direction X, and the light rays of the first wavelength range pass through the eighth face 9302, the second optical film 9306, the sixth face 9203, the fifth face 9202, the first optical film 9104, and the second face 9102 in order; finally, the light exits along the first direction X through the first face 9101. Light in the second wavelength range is incident from the ninth surface 9303, sequentially passes through the eighth surface 9302, the second optical film 9306, the sixth surface 9203, and the first optical film 9104 between the second surface 9102 and the fifth surface 9202, and is reflected from the fourth surface 9201 along the second direction Y. Light rays in the third wavelength range are incident from the ninth face 9303, reflected by the second optical film 9306 between the eighth face 9302 and the sixth face 9203, and then exit from the sixth face 9203 along the third direction Z. This is achieved by splitting the composite beam into light rays of a first, a second and a third wavelength range.

When the range of the incident light is relatively large or the size of the light splitting and combining device 100 is relatively small, the incident light may reach multiple surfaces at the same time. At this time, in the illustrated embodiment, light in the first wavelength range enters the first surface 9101 from the first direction X and passes through, and then a part passes through the second surface 9102, the first optical film 9104, the fifth surface 9202, the sixth surface 9203, the second optical film 9306, and the eighth surface 9302 in this order, and finally exits from the ninth surface 9303; the other part passes through the third surface 9103, the fourth optical film 9406, the fifteenth surface 9404, the thirteenth surface 9402, the third optical film 9405, and the eleventh surface 9305 in this order, and finally exits from the ninth surface 9303.

Light rays of the second wavelength range are incident along the second direction Y, a part of the light rays are incident from the fourth surface 9201 and pass through the fourth surface 9201, and then are reflected on the first optical film 9104 between the second surface 9102 and the fifth surface 9202, pass through the sixth surface 9203, the second optical film 9306, and the eighth surface 9302, and finally exit from the ninth surface 9303 along the first direction. The other part is incident from the tenth surface 9304, reflected by the third optical film 9405 between the thirteenth surface 9402 and the eleventh surface 9305, and finally exits from the ninth surface 9303 in the first direction. The reflective surface for light in the second wavelength range is shown with bold lines in fig. 12C.

Light rays in the third wavelength range enter along the third direction Z, and a part of the light rays reach the seventh face 9301 and pass through the seventh face 9302, then reach the eighth face 9302, are reflected by the second optical film 9306 to the ninth face 9303, and then exit along the first direction X through the ninth face 9303; the other part reaches the twelfth face 9401 and passes through, then reaches the fifteenth face 9404, is reflected by the fourth optical film 9406 between the fifteenth face 9404 and the third face 9103, and then exits along the first direction X through the eleventh face 9305 and then through the ninth face 9303; thus, light combination of light rays in the first, second and third wavelength ranges is realized.

When all the light beams travel reversely, the combined light beam enters from the ninth surface 9303 along the first direction X, a part of light rays in the first wavelength range sequentially pass through the eleventh surface 9305, the third optical film 9405, the thirteenth surface 9402, the fifteenth surface 9404, the fourth optical film 9406 and the third surface 9103, and finally exit from the first surface 9101 along the first direction X; another portion of the light rays of the first wavelength range sequentially pass through the eighth face 9302, the second optical film 9306, the sixth face 9203, the fifth face 9202, the first optical film 9104, and the second face 9102; finally, the light exits along the first direction X through the first face 9101.

A part of the light rays in the second wavelength range enter from the ninth surface 9303, pass through the eighth surface 9302, the second optical film 9306, the sixth surface 9203, reflect from the first optical film 9104 between the second surface 9102 and the fifth surface 9202, and exit from the fourth surface 9201 along the second direction Y in this order. Another part of the light rays of the second wavelength range enters from the ninth face 9303, is reflected by the third optical film 9405 between the thirteenth face 9402 and the eleventh face 9305, and exits from the tenth face 9304 along the second direction Y.

A part of the light rays of the third wavelength range enters from the ninth face 9303, is reflected by the second optical film 9306 between the eighth face 9302 and the sixth face 9203, and then exits from the seventh face 9301 along the third direction Z; another portion of the light in the third wavelength range enters from the ninth surface 9303, passes through the eleventh surface 9305, reaches the fifteenth surface 9404, is reflected by the fourth optical film 9406 between the fifteenth surface 9404 and the third surface 9103, and then exits from the twelfth surface 9401 along the third direction Z. This is achieved by splitting the composite beam into light rays of a first, a second and a third wavelength range.

It should be noted that the foregoing merely illustrates the optical path of the present invention. After the composite beam is incident from the ninth face 9303 along the first direction X, it may reach only the eleventh face 9305, but not the eighth face 9302. The light splitting optical path and the corresponding light combining optical path can refer to the light paths, and are not described herein.

In the illustrated embodiment, the first direction X, the second direction Y, and the third direction Z are perpendicular to each other, an angle of 45 degrees is formed between the first surface 9101 and the second surface 9102, the fourth surface 9201 is perpendicular to the first surface 9101, the fifth surface 9202 is an angle of 45 degrees to the fourth surface 9201, the seventh surface 9301 is perpendicular to the first surface 9101 and the fourth surface 9201, and the eighth surface 9302 is an angle of 45 degrees to the seventh surface 9301.

However, the present invention is not limited thereto, and the angle between the respective surfaces may be changed in combination with the change of the incident direction of the light to achieve the light combination and light splitting of the light in the first, second and third wavelength ranges.

In this embodiment, the first prism 910 has a quadrangular pyramid shape, the first surface 9101 is a bottom surface thereof, and the other two side surfaces except the second surface 9102 and the third surface 9103 are perpendicular to the first surface 9101. The second prism 920 has a triangular pyramid shape. The third prism 930 has a quadrangular pyramid shape, the ninth surface 9303 has a bottom surface, and the seventh surface 9301 and the tenth surface 9304 are perpendicular to each other. The fourth prism 940 has a triangular pyramid shape. However, the present invention is not limited thereto, and the forms of the first prism 910, the second prism 920, the third prism 930, and the fourth prism 940 may be changed.

Fig. 13A, 13B, and 13C are a schematic structural view, an exploded schematic view, and an optical path schematic view, respectively, of a light splitting and combining device 1000 according to a tenth embodiment of the present invention. As shown in fig. 13A to 13C, this tenth embodiment is a modification of the ninth embodiment. In this embodiment, the light splitting and combining device 1000 includes a first prism 1010, a second prism 1020, a third prism 1030 and a fourth prism 1040, and the structure of the light splitting and combining device is mirror symmetrical to the light splitting and combining device 900 in the ninth embodiment with respect to the first direction X, and other identical or similar parts will not be described herein.

Fig. 14A and 14B are a schematic structural view and a schematic optical path view of a light splitting and combining device according to an eleventh embodiment of the present invention, respectively. As shown in fig. 14A and 14B, in this embodiment, the light splitting and combining device 100 includes a prism 1100, and the prism 1100 is the same as the second prism in the first embodiment, and may be a triangular prism. The prism 1100 includes: a first surface 11001 for light rays in a first wavelength range to pass through and light rays in a second wavelength range to reflect; a second face 11002 for light of a second wavelength range to enter; and a third surface 11003 for passing light rays in the first and second wavelength ranges and reflecting light rays in the third wavelength range.

In the illustrated embodiment, light of a first wavelength range enters the first face 1101 from the first direction X and passes through, and then exits along the first direction X from the third face 11003; light rays of the second wavelength range are incident from the second face 11002 along the second direction Y, then reflected on the first face 11001, and exit from the third face 11003 along the first direction X; light rays of the third wavelength range are incident on the third face 11003 along the third direction Z and are reflected along the first direction.

When all the light beams travel in the reverse direction, the combined light beams are incident on the third surface 11003 along the first direction X, and the light rays of the first wavelength range pass through the third surface 11003 and then exit from the first surface 11001 along the first direction X; light rays of the second wavelength range pass through the third face 11003, then reflect on the first face 11001, and then exit the second face 11002 along the second direction Y; light in the third wavelength range is incident on the third face 11003 and reflected by the third direction Z of the fragrance.

Thus, light can be split and combined by using only the prism 1100.

In the light splitting and combining device 100 of the present invention, a plurality of prism-joined apertures may be formed only at the corners, and when light is incident on each surface, the light does not pass through the aperture formed by the prism-joined portions, and is incident on each surface, so that the influence of the light incident on the aperture on the image can be avoided, and the volume and the weight are smaller, thereby facilitating the overall miniaturization.

Although the present invention has been described in terms of a plurality of embodiments, those skilled in the art may make modifications, for example, the structure of the light splitting and combining device 700 in the tenth embodiment is the same as that in the first embodiment, and the incident and emergent directions of the light rays in the first, second and third wavelength ranges are opposite to those in the first embodiment; similar changes may be made to other embodiments with reference to both embodiments.

In addition, although the rectangular pyramid is described as an example in the above embodiments, the present invention is not limited thereto, and the rectangular pyramid in all embodiments may be formed by joining two rectangular pyramids, and an optical coating film is attached to the joining surface for passing light rays of the first, second, and third wavelength ranges. That is, the efficacy of the present invention can be achieved in any embodiment that allows light to be incident on the surface rather than at the seam.

In all of the above embodiments, only the optical coating between two surfaces is specifically described, the optical coating on a single surface is not specifically described, and it will be appreciated by those skilled in the art that at least the surface that reflects light in a certain wavelength range is optically coated.

The light splitting and combining device can be applied to a projector, and the projector comprises a light source, a projection lens, a spatial light modulator (spatial light modulator; SLM) and the light splitting and combining device, wherein the light rays emitted by the light source sequentially pass through the light splitting and combining device, the spatial light modulator and the projection lens and are imaged on a screen.

The light splitting and combining device can also be applied to a head-mounted display assembly, and the head-mounted display assembly comprises a light source, a projection lens and the light splitting and combining device, wherein light rays emitted by the light source sequentially pass through the light splitting and combining device and the projection lens.

The light splitting and combining device can be applied to a head-up display assembly, the head-up display assembly comprises a light source, a projection lens, a reflecting mirror, a spatial light modulator, a display assembly and the light splitting and combining device, light rays emitted by the light source sequentially pass through the light splitting and combining device, the spatial light modulator, the projection lens, the reflecting mirror and the display assembly, and the display assembly is similar to an imaging surface such as a screen.

The light splitting and combining device can be applied to a laser ranging component, wherein the laser ranging component comprises a photosensitive component, a light emitter and the light splitting and combining device.

The light splitting and combining device can be applied to a colorimeter assembly, wherein the colorimeter assembly comprises a light detector, a digital signal processor and the light splitting and combining device.

The light splitting and combining device can be applied to a panel, and the panel comprises a light source, a projection lens, a spatial light modulator and the light splitting and combining device, wherein light rays emitted by the light source sequentially pass through the light splitting and combining device, the spatial light modulator and the projection lens.

The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.

Claims

1. A light splitting and combining device, comprising a first prism and a second prism which are mutually jointed:

the first prism includes:

the first surface is used for allowing light rays in a first wavelength range to pass through;

a second face; and

a third face;

the second prism includes:

a fourth surface for passing light rays of the second wavelength range;

A fifth surface bonded to the second surface, and a first optical film coated between the fifth surface and the second surface, the first optical film passing the light beam in the first wavelength range and reflecting the light beam in the second wavelength range; and

a sixth surface for passing light rays in the first and second wavelength ranges and reflecting light rays in the third wavelength range;

the light rays of the first wavelength range can pass through the first face, the second face, the first optical film, the fifth face and the sixth face in sequence or in reverse sequence without reflection, or pass through the first face and the third face in sequence or in reverse sequence without reflection;

the light in the third wavelength range can be reflected by the sixth surface.

2. The light splitting and combining device of claim 1, wherein the third face is parallel to or in the same plane as the sixth face, the third face passing light in the first wavelength range and reflecting light in the third wavelength range; a part of the light rays in the first wavelength range can pass through the first surface, the second surface, the first optical film, the fifth surface and the sixth surface in sequence or in reverse sequence, and another part of the light rays in the first wavelength range can pass through the first surface and the third surface in sequence or in reverse sequence; a portion of the light rays of the third wavelength range can be reflected by the sixth face and another portion of the light rays of the third wavelength range can be reflected by the third face.

3. A light splitting and combining device, comprising a first prism and a second prism which are mutually jointed:

the first prism includes:

a second face; and

a third face;

the second prism includes:

a fourth face;

a fifth surface, which is attached to the second surface, and a first optical film is plated between the fifth surface and the second surface, wherein the first optical film passes light beams in a first wavelength range and is used for reflecting light beams in a second wavelength range; and

a sixth face;

wherein the first surface and the second surface are at an angle of 45 degrees, the fourth surface is perpendicular to the first surface, the fifth surface and the fourth surface are at an angle of 45 degrees, and the sixth surface and the first surface are at an angle of 45 degrees.

4. A light splitting and combining device as recited in claim 3, wherein said third face is parallel to or in the same plane as said sixth face, said third face passing light in said first wavelength range and reflecting light in a third wavelength range; a part of the light rays in the first wavelength range can pass through the first surface, the second surface, the first optical film, the fifth surface and the sixth surface in sequence or in reverse sequence, and another part of the light rays in the first wavelength range can pass through the first surface and the third surface in sequence or in reverse sequence; a portion of the light rays of the third wavelength range can be reflected by the sixth face and another portion of the light rays of the third wavelength range can be reflected by the third face.

5. A light splitting and combining device as claimed in claim 1 or 3, further comprising a third prism comprising:

a seventh surface for passing light rays of the third wavelength range;

a eighth face attached to the sixth face with a second optical film interposed therebetween, the second optical film passing light rays of the first wavelength range and reflecting light rays of the third wavelength range;

a ninth surface for passing light rays in the first, second and third wavelength ranges;

the third surface is parallel to or in the same plane as the sixth surface, and is used for allowing the light rays in the first wavelength range to pass through and reflecting the light rays in the third wavelength range;

the third prism further includes: a tenth surface for passing light rays of the second wavelength range; and a tenth surface for passing light rays in the first wavelength range and reflecting light rays in the second wavelength range.

6. The light splitting and combining device of claim 5, wherein,

the light rays in the first wavelength range can pass through the first surface, the third surface, the tenth surface and the ninth surface sequentially or in reverse order, and/or can pass through the first surface, the second surface, the first optical film, the fifth surface, the sixth surface, the second optical film, the eighth surface and the ninth surface sequentially or in reverse order; the light rays of the second wavelength range can pass through the tenth face, be reflected by the eleventh face, pass through the ninth face, and/or can pass through the fourth face, reach the fifth face, be reflected by the first optical film, pass through the sixth face, pass through the second optical film, pass through the eighth face, pass through the ninth face in order or in reverse order; the light rays of the third wavelength range can be reflected by the third face, through the tenth face, through the ninth face, in order or in reverse order, or can be sequentially or in reverse order through the seventh face, to the eighth face, reflected by the second optical film, through the ninth face.

7. A light splitting and combining device as claimed in claim 1 or 3, further comprising a third prism comprising:

a seventh surface for passing light rays of the third wavelength range;

a third surface, which is bonded to the third surface, and between which a second optical film is coated, the second optical film passing light rays in the first wavelength range and reflecting light rays in the third wavelength range; and

a ninth surface for passing light rays in the first wavelength range and reflecting light rays in the second wavelength range;

the light rays in the first wavelength range can pass through the first surface, the second surface, the first optical film, the fifth surface and the sixth surface in sequence or in reverse sequence; or can pass through the first surface, the third surface, the second optical film, the eighth surface and the ninth surface sequentially or in reverse order;

the light rays in the second wavelength range can pass through the fourth surface, be reflected by the first optical film between the fifth surface and the second surface and pass through the sixth surface in sequence or in reverse sequence; or can be reflected on the ninth face;

The light rays in the third wavelength range can pass through the seventh surface, be reflected by the second optical film between the eighth surface and the third surface and pass through the ninth surface in sequence or in reverse sequence; or can be reflected by said sixth face.

8. The light splitting and combining device of claim 7, wherein the first prism is a quadrangular pyramid, and the first surface is a bottom surface thereof; the second prism is triangular pyramid; the third prism is triangular pyramid; the ninth face is parallel to or in the same plane as the fifth face.

9. A light splitting and combining device as claimed in claim 1 or 3, wherein the first prism is a four-prism shape, further comprising: a seventh surface for passing light in the second wavelength range; and a eighth face through which light in a third wavelength range passes; the second prism is in a triangular prism shape and further comprises a ninth surface for passing light rays in a third wavelength range;

a part of the light rays in the first wavelength range can pass through the first surface, the second surface, the first optical film, the fifth surface and the sixth surface in sequence or in reverse sequence; another part of the light rays in the first wavelength range can pass through the first surface and the third surface sequentially or reversely;

The light rays in the second wavelength range can pass through the first surface, be reflected by the first optical film between the second surface and the fifth surface and pass through the seventh surface in sequence or in reverse sequence;

a portion of the light in the third wavelength range is capable of passing through the first face, being reflected by the third face, and passing through the eighth face, either sequentially or in reverse order.

10. The light splitting and combining device of claim 6, further comprising a fourth prism, the fourth prism comprising:

a second surface for passing light in a second wavelength range;

a tenth surface bonded to the eleventh surface, a third optical film being plated between the tenth surface and the eleventh surface, the third optical film passing light rays in the first wavelength range and reflecting light rays in the second wavelength range;

a tenth surface for passing the light rays in the first wavelength range and reflecting the light rays in the second wavelength range; and

a tenth surface bonded to the third surface, a fourth optical film being plated between the tenth surface and the third surface, the fourth optical film passing light rays in the first wavelength range and reflecting light rays in the third wavelength range;

The light rays in the first wavelength range can pass through the first surface, the second surface, the first optical film, the fifth surface, the sixth surface, the second optical film, the eighth surface and the ninth surface in sequence or in reverse sequence; and/or can pass through the first, third, fourth, tenth, third, eleventh, and ninth faces in order or in reverse order;

the light rays in the second wavelength range can pass through the fourth face, reach the fifth face, be reflected by the first optical film, pass through the sixth face, pass through the second optical film, pass through the eighth face and pass through the ninth face in sequence or in reverse sequence; or can pass through the tenth surface, be reflected by the third optical film between the tenth and eleventh surfaces, pass through the ninth surface in either order or in reverse order;

the light rays in the third wavelength range can pass through the seventh surface, reach the eighth surface, be reflected by the second optical film and pass through the ninth surface in sequence or in reverse sequence; or can pass through the tenth face, be reflected by the fourth optical film between the tenth and third faces, pass through the tenth face, pass through the ninth face in either order or in reverse order.

11. The light splitting and combining device of claim 10, wherein the first prism is a quadrangular pyramid, and the first face is a bottom face thereof; the second prism is triangular pyramid; the third prism is in a quadrangular pyramid shape, and the ninth surface is the bottom surface of the third prism; the fourth prism is a triangular pyramid.

12. A light splitting and combining device, comprising a prism, the prism comprising:

the first surface is used for allowing light rays in a first wavelength range to pass through and light rays in a second wavelength range to reflect;

the second surface is used for incidence of light rays in a second wavelength range; and

a third surface through which light in a first wavelength range passes and which is reflected by light in a third wavelength range, wherein light in the first wavelength range can pass through the first surface and the third surface in sequence or in reverse sequence without being reflected;

the light rays in the second wavelength range can pass through the second surface, reach the first surface and be reflected by the first surface in sequence or in reverse sequence;

the light in the third wavelength range is capable of being reflected by the third face.

13. The light splitting and combining device of claim 1, 4 or 12, wherein the light in the first wavelength range, the light in the second wavelength range and the light in the third wavelength range do not overlap each other in wavelength ranges and at least one of the following conditions is satisfied:

the third wavelength range is different from each other by 20nm or more, and is not interposed between the first wavelength range and the second wavelength range.

14. A projector comprising a light source, the light splitting/combining device according to any one of claims 1, 3, or 12, a spatial light modulator, and a projection lens.

15. A head mounted display assembly comprising a light source, a light splitting and combining device as claimed in any one of claims 1, 3 or 12, and a projection lens.

16. A heads-up display assembly comprising a light source, a projection lens, a mirror, a spatial light modulator, and a light splitting and combining device as claimed in any one of claims 1, 3 or 12.