Prism device and projection equipment

Abstract

The present application provides a prism device, the prism device comprising: a prism body, comprising a plurality of prisms connected in sequence along the light-guiding direction thereof, wherein a gap is provided at the connection between at least two adjacent prisms among the plurality of prisms; a first assembly, arranged parallel to the light-guiding direction, located at the joint of the plurality of prisms, and connected to the plurality of prisms; a second assembly, arranged parallel to the light-guiding direction, covering and connecting the first assembly. The present application also provides a projection device, comprising a projection display screen, the projection device further comprising the prism device and a light source, the light emitted by the light source being projected onto the projection display screen through the prism device, thereby improving the stability of the air gap of the prism and increasing the reliability of the prism.

Description

Technical Field

[0001] The present application relates to the field of optics and projection technology, and in particular to a prism device and a projection equipment. Background Art

[0002] Projection equipment is now widely used in various conferences and home theaters. With the development of optical instruments, projection equipment on the market is continuously promoted and applied by all walks of life. Refractive prisms are commonly used optical components in projection equipment. They are usually set at the light modulator of the optical system to guide the light beam into the light modulator and then receive the image light formed after modulation, guide the image light to the projection lens and finally project it on the projection screen. The refractive prism in the projection equipment usually includes multiple prisms. The accuracy of optical refraction between prisms determines the imaging quality of the projection equipment. As the application scope of projection equipment becomes wider and wider, the integration of projection equipment is also improved, which promotes the development of refractive prisms.

[0003] However, as the accuracy of projection equipment increases, more and more problems are encountered. During projection, as high-brightness light is reflected between prisms, the temperature of the prism body increases, and the prism body begins to expand due to the heat, causing the gap between prisms to change, which in turn causes aberrations that affect the image quality. In more serious cases, high temperature can cause the bonding between prisms to fail, the parallelism of the gap between prisms to change due to thermal expansion, the thermal image deterioration of the coating surface, and the prism to break due to overheating. How to improve the stability of prisms under high temperature conditions has become a major problem. Summary of the invention

[0004] The purpose of the present application is to overcome the deficiencies in the prior art and to provide a prism device and a projection device for improving the stability of the prism under high temperature conditions.

[0005] In order to solve the above technical problems, the present application provides a prism device, which includes:

[0006] The prism body comprises a plurality of prisms connected in sequence along the light guiding direction thereof, wherein a gap is provided at the connection between at least two adjacent prisms among the plurality of prisms;

[0007] A first assembly, arranged parallel to the light guiding direction, located at the joints of the plurality of prisms, and connected to the plurality of prisms;

[0008] The second assembly is arranged parallel to the light guiding direction, and covers and connects the first assembly.

[0009] The present application also provides a projection device, including a projection display screen. The projection device also includes the above-mentioned prism device and a light source. The light emitted by the light source is projected onto the projection display screen through the prism device.

[0010] The present application provides a prism device and a projection device. The prism device blocks the force transmission of the second assembly to the prism body after being heated by a first assembly located at the joint of at least two adjacent prisms among the multiple prisms of the prism body, so that the tensile force generated by the thermal expansion of the second assembly is blocked by the first assembly and does not directly act on the multiple prisms of the prism body, isolates the influence of the thermal expansion of the second assembly on the air gap of the prism body, and improves the stability of the prism body. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the implementation will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0012] Figure 1 is a cross-sectional schematic diagram of a prism device according to a first embodiment of the present application;

[0013] Figure 2 yes Figure 1 A top view of a prism body of a middle prism device;

[0014] Figure 3 is a cross-sectional schematic diagram of a prism device according to a second embodiment of the present application;

[0015] Figure 4 is a cross-sectional schematic diagram of a prism device according to a third embodiment of the present application;

[0016] Figure 5 is a top view of a prism device according to a fourth embodiment of the present application;

[0017] Figure 6 It is a top view of the prism device of the fifth embodiment of the present application. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0019] In the description of the present application, it should be noted that the terms "upper", "lower", "left", "right", "horizontal", "vertical", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present application, "several" means two or more, unless otherwise clearly and specifically defined.

[0020] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0021] In the description of the embodiments of the present application, it should be understood that the terms "first" and "second" are only used to facilitate the description of the present application and simplify the description, and therefore cannot be understood as limitations on the present application.

[0022] The present application provides a prism device; the prism device includes: a prism body, including a plurality of prisms connected in sequence along its light guiding direction, wherein a gap is provided at the connection between at least two adjacent prisms among the plurality of prisms; a first assembly, arranged parallel to the light guiding direction, located at the seam of the plurality of prisms, and connected to the plurality of prisms; a second assembly, arranged parallel to the light guiding direction, covering and connecting the first assembly.

[0023] The present application provides a prism device, which blocks the force transmission of the second assembly to the prism body after being heated by arranging a first assembly located at the joint of at least two adjacent prisms among the multiple prisms of the prism body between the prism body and the second assembly, so as to achieve the goal that the tensile force generated by the thermal expansion of the second assembly is blocked by the first assembly and does not directly act on the multiple prisms of the prism body, thereby isolating the influence of the thermal expansion of the second assembly on the gap between the multiple prisms of the prism body and improving the stability of the prism body.

[0024] Please also read Figure 1 and Figure 2 , Figure 1 is a cross-sectional schematic diagram of the prism device of the first embodiment of the present application

[0025] Figure 2 yes Figure 1 A top view of the prism body of the middle prism device. Figure 2 for Figure 1 The prism device shown is a top view with the second assembly removed.

[0026] like Figure 2 As shown, in this embodiment, the prism body refers to a whole composed of multiple prisms. The prism has high light transmittance; Figure 2 The straight line with an arrow in the middle represents the movement path of the light beam. When the light beam is irradiated on the prism, due to the light transmittance of the prism, most of the incident light beam will enter the prism, be reflected at the contact surface of the two prisms based on the incident angle, and enter the light modulator of the light path. The light modulator will emit the modulated light beam toward the prism. This application uses this direction as the light guiding direction of the prism body.

[0027] The prism body includes a first prism 12, a second prism 15 and a third prism 17. The first prism 12, the second prism 15 and the third prism 17 are all made of materials with the same thermal expansion coefficient and good light transmittance, such as K9 material. The K9 glass is a glass product made of K9 material with a thermal expansion coefficient of 7.6*10 -6 m / K, the temperature range is -30-70℃, that is, when the temperature changes in the range of -30 to 70℃, the thickness of K9 glass increases by 7.6 microns for every 1℃ increase in temperature. In this embodiment, the shapes of the first prism 12, the second prism 15 and the third prism 17 are all triangular prisms with the same height, and each triangular prism includes a side edge surface, an upper surface and a lower surface; the side edges of the first prism 12 and the second prism 15 are relatively fitted, and the side edges of the second prism 15 and the third prism 17 are relatively fitted, and the upper surfaces of the first prism 12, the second prism 15 and the third prism 17 are in the same plane. In this embodiment, there is a gap between the side edges of the first prism 12 and the second prism 15, and there is a gap between the side edges of the second prism 15 and the third prism 17.

[0028] In other embodiments, the first prism 12, the second prism 15 and the third prism 17 may be made of other materials with the same thermal expansion coefficient and good light transmittance. The first prism 12, the second prism 15 and the third prism 17 may be in other shapes as needed, such as a quadrangular prism.

[0029] like Figure 2 As shown, the first assembly 16 is arranged parallel to the light-guiding direction of the prism body, and is located at the joint of the plurality of prisms and connected to the plurality of prisms; the second assembly 18 is also arranged parallel to the light-guiding direction, covering and connecting the first assembly.

[0030] In this embodiment, the second assembly 18 can be used to fix the relative position of the prism body and other components of the prism device 100. The second assembly 18 is generally located near the prism body, parallel to the light guide direction, and the second assembly 18 covers the surface of the prism body. In this embodiment, the second assembly 18 covers the upper surface of the prism body; in this embodiment, the second assembly 18 can be used to conduct the heat of the prism body. Since metal materials have good thermal conductivity, it is convenient for the prism body to dissipate heat under high brightness and long-term lighting, so the second assembly 18 can be made of metal.

[0031] In this embodiment, the second assembly member may be a second assembly member 18 made of metal. The material of the second assembly member 18 may be SUS430. The second assembly member 18 may be in the shape of a long plate.

[0032] In other embodiments, the second assembly 18 may also be disposed on the lower surface of the prism body to fix and support the prism body.

[0033] In this embodiment, if the second assembly 18 is made of metal, since the thermal expansion coefficient of the second assembly 18 is 10.4*10 -6 m / K. When the second assembly 18 is heated, the length of the second assembly 18 increases by 10.4 microns for every 1°C temperature increase; that is, for every 1°C temperature increase, the length change of the metal plate is 2.8 microns greater than the thickness change of the prism body, which causes the metal plate to apply a lateral tensile force to the prism body. In order to avoid the lateral tensile force directly acting on the prism body, a first assembly is arranged between the prism body and the second assembly 18.

[0034] The first assembly 16 is disposed between the prism body and the second assembly 18 and is disposed parallel to the light guide direction to block the force conduction between the second assembly 18 and the prism body; specifically, the first assembly 16 is disposed on the upper surface of the prism body. The first assembly 16 simultaneously covers the upper surface of the first prism 12, the upper surface of the second prism 15, and the upper surface of the third prism 17, that is, the first assembly 16 covers the upper surfaces of the first prism 12, the second prism 15, and the third prism 17, and also covers the joints between the upper surfaces of the above prisms.

[0035] In other embodiments, the first assembly 16 may completely cover the upper surface of the entire prism body. Specifically, the first assembly 16 may completely cover the upper surface of the first prism 12 , the upper surface of the second prism 15 , and the upper surface of the third prism 17 .

[0036] In other embodiments, a plurality of the first assembly members 16 may be provided, and the first assembly members 16 are respectively provided at the joints between the upper surfaces of the first prism 12 and the second prism 15 , and at the joints between the upper surfaces of the second prism 15 and the third prism 17 .

[0037] In other embodiments, the first assembly 16 and the second assembly 18 may also be arranged on the lower surface of the prism body, or the first assembly 16 and the second assembly 18 may be arranged on the upper surface and the lower surface of the prism body at the same time. The first assembly 16 and the second assembly 18 are arranged on the surface of the prism body parallel to the light guiding direction without affecting the normal operation of the prism body.

[0038] In this embodiment, in order to ensure that the first assembly 16 and the prism body expand by the same amount when heated and to avoid the first assembly from exerting a lateral tensile force on the prism body, the first assembly 16 is made of the same material as the prism body, that is, the material of the first assembly 16 may also be K9 glass; since the first assembly 16 is arranged between the second assembly 18 and the prism body, in order to facilitate the surface of the first assembly 16 to fit the prism body and the second assembly 18, the shape of the first assembly 16 is also a long plate, that is, the first assembly 16 is a glass barrier plate; in order to ensure the stability between the second assembly 18 and the first assembly 16, the thickness of the first assembly 16 should not be too thick; in this embodiment, the thickness of the first assembly 16 is less than the thickness of the second assembly 18.

[0039] In one embodiment, a receiving cavity 181 is provided on the surface of the second assembly 18 facing the prism body at a position corresponding to the first assembly 16, and the receiving cavity 181 is used to receive the first assembly 16. The receiving cavity 181 includes an inner side surface and a bottom surface; the shape of the cross section of the receiving cavity 181 matches the shape of the cross section of the first assembly 16, that is, the cross section of the receiving cavity 181 may be a rectangle. The area of ​​the cross section of the receiving cavity 181 is greater than the area of ​​the cross section of the first assembly 16, that is, when the first assembly 16 is received in the receiving cavity 181, a gap is left between the side surface of the first assembly 16 and the inner side surface corresponding to the receiving cavity 181, thereby ensuring that there is a clearance fit between the receiving cavity 181 and the first assembly 16, preventing the first assembly 16 from being restricted by the receiving cavity 181 when it expands due to heat, and at the same time, preventing the second assembly 18 from causing damage to the first assembly 16 during assembly.

[0040] The depth of the receiving cavity 181 is smaller than the thickness of the first assembly 16 , so as to ensure that when the first assembly 16 is received in the receiving cavity, the surface of the first assembly 16 facing away from the prism body contacts the bottom surface of the receiving cavity 181 .

[0041] See also Figure 3 , Figure 3 It is a cross-sectional schematic diagram of a prism device according to the second embodiment of the present application.

[0042] like Figure 3 As shown, the second assembly 18 can also be directly connected to the first assembly 16, that is, the first assembly 16 covers the upper surface of the prism body, and the second assembly 18 covers the upper surface of the first assembly 16, and the prism body, the first assembly 16 and the second assembly 18 sequentially form a stacked structure; the prism body and the first assembly 16 are connected by UV glue, and the first assembly 16 and the second assembly 18 are also connected by UV glue. In this way, it is avoided to open a cavity on the second assembly 18, the integrity of the overall structure of the second assembly 18 is guaranteed, and the fixing effect and heat conduction effect of the second assembly 18 are enhanced.

[0043] like Figure 1 As shown, in this embodiment, the prism device also includes an optical modulator 14 and an aperture. The optical modulator 14 refers to a device that can modulate a certain parameter of the light field by controlling information under active control, such as by modulating the amplitude of the light field, modulating the phase by the refractive index, modulating the polarization state by rotating the polarization plane, or realizing the conversion of incoherent-coherent light, so as to write certain information into the light wave and achieve the purpose of light wave modulation. The optical modulator 14 is an important device in modern optical fields such as real-time optical information processing, adaptive optics and optical computing. In this embodiment, the optical modulator 14 is arranged near the first prism 12 to ensure that the light reflected by the first prism 12 can be incident on the position of the optical modulator 14. The specific position of the optical modulator 14 is determined according to the angle of the light reflected by the first prism 12.

[0044] The aperture refers to an entity that limits the light beam in an optical system. It can be the edge of a lens, a frame, or a specially set screen with holes. Its function can be divided into two aspects: limiting the light beam or limiting the size of the field of view (imaging range). In this embodiment, the aperture is fixed in the iron-nickel-cobalt alloy plate, that is, Figure 1 The Kovar plate is fixed between the first prism 12 and the light modulator 14, and is used for the light beam reflected by the first prism 12 to pass through the aperture in the Kovar plate and enter the light modulator 14.

[0045] During assembly, the prism bodies are assembled first. The prism bodies are glued together with relatively soft glue. Since the thermal expansion coefficient of the glue is too large, it will damage the prism under high temperature conditions. Therefore, UV glue with a thermal expansion coefficient close to that of the prism is used. The thermal expansion coefficient of the UV glue is 9.6*10 -6 m / K; by applying the UV glue on the side edges opposite to the first prism 12 and the second prism 15, and bonding the side edges coated with the UV glue to each other, after the first prism 12 and the second prism 15 are bonded by the UV glue, the upper surfaces of the first prism 12 and the second prism 15 are in the same plane. The photoinitiator (or photosensitizer) in the UV curing material contained in the UV glue absorbs ultraviolet light under the irradiation of ultraviolet light to generate active free radicals or cations, which triggers monomer polymerization and cross-linking chemical reactions, so that the adhesive is converted from liquid to solid within a few seconds, thereby achieving the bonding of the first prism 12 and the second prism 15. After the positions of the first prism 12 and the second prism 15 are fixed, similarly, the opposite side edges of the second prism 15 and the third prism 17 are glued together according to the above method, so that the positions of the first prism 12, the second prism 15 and the third prism 17 are relatively fixed, and the upper surfaces of all prisms are in the same plane, and there is a gap at the bonding surface between the first prism 12 and the second prism 15, and there is a gap at the bonding surface between the second prism 15 and the third prism 17.

[0046] In other embodiments, UV glue may be applied to specific areas on the side edges of the prisms by dispensing. For example, UV glue is applied to the areas near the corners of the side edges of the first prism 12 and the second prism 15, and then the side edges coated with UV glue are bonded.

[0047] Next, assemble the first assembly 16 and the prism body. Apply UV glue evenly on the upper surfaces of the first prism 12, the second prism 15 and the third prism 17, and the application range of the UV glue at least covers the joints between the upper surfaces of the first prism 12 and the second prism 15, and the joints between the upper surfaces of the second prism 15 and the third prism 17. Then, cover the first assembly 16 on the application position of the UV glue, and wait until the UV glue is converted into a solid state, so that the positions of the first assembly 16 and the prism body are relatively fixed.

[0048] Next, assemble the second assembly 18, the first assembly 16 and the prism body, evenly apply the UV glue on the bottom surface of the receiving cavity of the second assembly 18, and buckle the second assembly 18 on the prism body so that the first assembly 16 is correspondingly received in the receiving cavity of the second assembly 18, and the surface of the first assembly 16 facing away from the prism body contacts the bottom surface of the receiving cavity. After the UV glue in the receiving cavity solidifies into a solid state, the position between the second assembly 18 and the first assembly 16 is relatively fixed; because the depth of the receiving cavity is less than the thickness of the first assembly 16, after the surface of the first assembly 16 facing away from the prism body abuts against the bottom surface of the receiving cavity, a gap is left between the second assembly 18 and the prism body; then inject thermal conductive glue into the gap between the second assembly 18 and the prism body, and after the thermal conductive glue solidifies, the position of the second assembly 18 and the prism body is relatively fixed. The thermal conductive glue is used to conduct the heat of the prism body to the second assembly.

[0049] Finally, the light modulator 14 is assembled by first assembling the light modulator 14 and the Kovar plate where the aperture is located, and then fixing the side surface of the first prism 12 and the Kovar plate where the aperture is located by UV glue, thereby completing the assembly process of the prism device 100.

[0050] Thus, by arranging the first assembly 16 between the prism body and the second assembly 18, the tensile force of the second assembly 18 on the prism body after being heated is blocked, the gap spacing between the prisms is ensured, and the problems of red halo, pixel separation, Newton rings, etc. in the light beam reflected by the prism are avoided, so that the prism device 100 can still maintain stability in an environment with cyclic changes in temperature.

[0051] See also Figure 4 , Figure 4 is a cross-sectional schematic diagram of a prism device according to a third embodiment of the present application;

[0052] like Figure 4 As shown, the structure of the prism device 200 of this embodiment is similar to the structure of the prism device 100 in the above-mentioned embodiment, and the main difference is that the prism device 200 of this embodiment also includes a heat dissipation mechanism 19, and the heat dissipation mechanism 19 is arranged on the side surface of the second assembly 18 facing away from the prism body. The heat dissipation mechanism 19 can be a heat dissipation fin on the second assembly 18. When the temperature of the prism body and the second assembly 18 rises, the heat dissipation area is expanded by the heat dissipation fins arranged on the second assembly 18, thereby reducing the influence of temperature on the prism device 100.

[0053] In other embodiments, the heat dissipation mechanism 19 may also be configured as a fan, the fan and the second assembly 18 are connected via a heat-conducting adhesive, and a temperature sensor is provided in the prism device 100. When the temperature sensor in the prism device 200 senses that the temperature of the second assembly 18 reaches a temperature threshold, the fan is activated to dissipate heat for the prism device 200. The temperature threshold is a preset temperature of the prism body, and when the temperature of the prism body reaches the temperature, the power of the fan is turned on.

[0054] In other embodiments, an air duct may be further provided on a surface of the second assembly 18 facing away from the prism body, and an inlet of the air duct is opened on the side of the second assembly 18 or on a surface facing away from the prism body, and the air duct is provided along a length or width direction of the second assembly 18. The temperature of the prism body is transferred to the second assembly 18 through the thermal conductive adhesive, and the second assembly 18 dissipates the heat into the air through the air flowing in the air duct, thereby achieving heat dissipation.

[0055] Therefore, by providing the heat dissipation mechanism 19 on the second assembly 18, the heat diffusion of the prism body and the second assembly 18 is accelerated, the influence of temperature on the prism body is reduced, the thermal expansion of the prism body is reduced, the stability of the prism device 200 is improved, and the application range of the prism device 200 is expanded.

[0056] See also Figure 5 , Figure 5 is a top view of the prism device of the fourth embodiment of the present application. Figure 5 This is a top view of a prism device of another embodiment with the second assembly removed.

[0057] like Figure 5 As shown, the structure of the prism device 300 of this embodiment is similar to that of the prism device 100 in the above-mentioned embodiment, with the main difference being that the prism device 300 of this embodiment is composed of two sets of prism bodies; for the sake of easy distinction, in this embodiment, the prism bodies include a fourth prism 12b, a fifth prism 15b and a sixth prism 17b in addition to the first prism 12a, the second prism 15a and the third prism 17a. The fourth prism 12b and the fifth prism 15b, the fifth prism 15b and the sixth prism 17b, and the sixth prism 17b and the third prism 17a are all connected by the UV glue.

[0058] In this embodiment, the prism device 300 also includes a first assembly 16a and a third assembly 16b. The first assembly 16a covers the joint between the upper surfaces of the first prism 12a and the second prism 15a, and covers the joint between the upper surfaces of the second prism 15a and the third prism 17a. The third assembly 16b covers the joint between the upper surfaces of the fourth prism 12b and the fifth prism 15b, and covers the joint between the upper surfaces of the fifth prism 15b and the sixth prism 17b.

[0059] Please also read Figure 1 and Figure 5 , Figure 1 A structural diagram of a prism device including a prism body, Figure 5 The prism device includes a structural diagram of two prism bodies. In this embodiment, two receiving grooves are provided on the surface of the second assembly 18 facing the prism body at positions corresponding to the first assembly 16a and the third assembly 16b. The first receiving groove is used to receive the first assembly 16a, and the second receiving groove is used to receive the third assembly 16b.

[0060] The prism device 100 further includes two light modulators. The first light modulator 14a is disposed near the first prism 12a, and is used to receive the light beam reflected by the first prism 12a, modulate the light beam, and project the modulated light beam to the third prism 17a via the second prism 15a. The second light modulator 14b is disposed near the fourth prism 12b, and is used to receive the light beam reflected by the fourth prism 12b, and project the modulated light beam to the sixth prism 17b via the fifth prism 15b.

[0061] In this embodiment, the prism device 100 further includes a light source 10, an optical-mechanical system 11, and a beam splitter 13. The light source 10 is used to provide an illumination beam, and the optical-mechanical system 11 is used to shape the illumination beam emitted by the light source 10. The beam splitter 13 is used to split the shaped illumination beam emitted by the optical-mechanical system 11;

[0062] In this embodiment, after the light source 10 emits an illumination light beam, the illumination light beam forms a uniform illumination light beam after being acted upon by the optical-mechanical system 11. The illumination light beam is incident on the beam splitter 13, and the beam splitter 13 splits the illumination light beam. The illumination light beam is divided into illumination light c1 and illumination light c2 after passing through the beam splitter 13. The illumination light c1 is incident on the first prism 12a, and is reflected at the interface between the first prism 12a and the second prism 15a. The reflected illumination light c1 is incident on the first light modulator 14a, and the first light modulator 14a modulates the illumination light c1 and emits image light d1. The image light d1 passes through the first prism 12a, the second prism 15a and the third prism 17a in sequence, and is incident on the sixth prism 17b. The illumination light c2 is incident on the fourth prism 12b and is reflected at the interface between the fourth prism 12b and the fifth prism 15b. The reflected illumination light c2 is incident on the second light modulator 14b. The second light modulator 14b modulates the illumination light c2 and emits image light d2. The image light d2 passes through the fourth prism 12b, the fifth prism 15b and the sixth prism 17b in sequence and is incident on the reflecting surface of the sixth prism 17b. After being reflected by the reflecting surface of the sixth prism 17b, it merges with the image light d1, is mixed into colored image light and is emitted from the sixth prism 17b.

[0063] During assembly, the prism body is assembled first, and the first prism 12a, the second prism 15a and the third prism 17a are assembled by the above-mentioned assembly method. At the same time, the fourth prism 12b, the fifth prism 15b and the sixth prism 17b are assembled by the same method. After the first prism 12a, the second prism 15a and the third prism 17a are assembled, and the fourth prism 12b, the fifth prism 15b and the sixth prism 17b are assembled, UV glue is applied to the reflection surface of the sixth prism 17b facing the third prism 17a, and it is glued to the third prism 17a. After the positions of the sixth prism 17b and the third prism 17a are relatively fixed, the assembly of the prism body is completed.

[0064] Secondly, assemble the first assembly 16a and the third assembly 16b. After assembling the first assembly 16a on the upper surfaces of the first prism 12a, the second prism 15a and the third prism 17a by the above method, assemble the third assembly 16b on the upper surfaces of the fourth prism 12b, the fifth prism 15b and the sixth prism 17b according to the above method to complete the assembly of the first assembly 16a and the third assembly 16b.

[0065] Next, assemble the second assembly and put the second assembly upside down on the prism body so that the first assembly 16a is accommodated in the first accommodation cavity of the second assembly, and the third assembly 16b is accommodated in the second accommodation cavity of the second assembly, and the side surface of the first assembly 16a facing away from the prism body contacts the bottom surface of the first accommodation cavity, and the side surface of the third assembly 16b facing away from the prism body contacts the bottom surface of the second accommodation cavity. When the side surface of the first assembly 16a facing away from the prism body is completely glued to the bottom surface of the first accommodation cavity, and the side surface of the third assembly 16b facing away from the prism body is completely glued to the bottom surface of the second accommodation cavity, the assembly of the second assembly is completed.

[0066] Finally, the first light modulator 14a is fixedly connected to the Kovar plate with an aperture, and then the Kovar plate with an aperture is fixed to the side edge surface of the first prism 12a, so that the light refracted by the first prism 12a can enter the first light modulator 14a through the aperture. The second light modulator 14b is fixedly connected to the Kovar plate with an aperture, and then the Kovar plate with an aperture is fixed to the side edge surface of the fourth prism 12b, so that the light refracted by the fourth prism 12b can enter the second light modulator 14b through the aperture. The first light modulator 14a and the side edge surface of the first prism 12a can be fixed with UV glue, and the second light modulator 14b and the side edge surface of the fourth prism 12b can also be fixed with UV glue.

[0067] See also Figure 6 , Figure 6 is a top view of the prism device of the fifth embodiment of the present application. Figure 6 This is a top view of a prism device of another embodiment with the second assembly removed.

[0068] like Figure 6 As shown, the structure of the prism device 400 of this embodiment is similar to the structure of the prism device 100 in the above-mentioned embodiment, and the main difference is that the prism body in the prism device 400 of this embodiment adopts a Philip prism structure, and the prism body of the Philip prism includes a first prism 12, a second prism 15 and a third prism 17. The bonding surface between the first prism 12 and the second prism 15 is surface S1, and the bonding surface between the second prism 15 and the third prism 17 is surface S2; the surface S1 and the surface S2 are coated with a dichroic medium film, and the first assembly 16 covers the upper surface of each prism of the Philip prism, and the first assembly 16 covers the joint between the upper surface of the first prism 12 and the second prism 15, and the joint between the upper surface of the second prism 15 and the third prism 17.

[0069] like Figure 6 As shown, the light beam achieves color separation and mixing when incident on the first prism 12 and the second prism 15. Since the incident angle of the light beam incident on the surface S1 and the surface S2 is small, the coating curve is sharp, the transition area is narrow, and the deviation of the spectrum line with the angle is small, so the efficiency of Philip prism in light splitting and light combination is high; and since the incident angle of the light on the surface S1 and the surface S2 is less than the critical angle of the glass material, it is not necessary to glue each prism together, and the light beam can achieve light splitting.

[0070] In other embodiments, the upper surface of the Philip prism is also covered with a second assembly for rapid heat conduction and heat dissipation. A fan or air duct may be provided on the metal plate corresponding to the non-light beam irradiation area to assist in heat dissipation. Figures 1 to 5 The second assembly 18 in the illustrated prism device embodiment is similar and will not be described in detail herein.

[0071] The present application also provides a projection device, including a projection display screen. The projection device also includes a prism device and a light source. The light emitted by the light source is projected onto the projection display screen through the prism device.

[0072] The prism device in the projection device of this embodiment can be the above Figures 1 to 6 The prism device in any embodiment shown in the figure can be specifically referred to in the above Figures 1 to 6 The description is not repeated here.

[0073] The present application provides a prism device and a projection device. The prism device blocks the force transmission of the second assembly to the prism body after being heated by a first assembly located at the joint of at least two adjacent prisms among the multiple prisms of the prism body, so that the tensile force generated by the thermal expansion of the second assembly is blocked by the first assembly and does not directly act on the multiple prisms of the prism body, thereby isolating the influence of the thermal expansion of the second assembly on the air gap of the prism body and improving the stability of the prism body.

[0074] The above is an implementation method of the embodiment of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the embodiment of the present application. These improvements and modifications are also considered to be within the scope of protection of the present application.

Claims

1. A prism device, characterized in that: The prism device comprises: The prism body comprises a plurality of prisms connected in sequence along the light guiding direction thereof, wherein a gap is provided at the connection between at least two adjacent prisms among the plurality of prisms; A first assembly is arranged parallel to the light guiding direction, is located at the joint of the plurality of prisms, and covers and adheres to the surfaces of the plurality of prisms in the same direction, and the thermal expansion coefficient of the first assembly is the same as the thermal expansion coefficient of the prism body; The second assembly is arranged parallel to the light guiding direction, covers and adheres to the surface of the first assembly facing away from the plurality of prisms, and the second assembly is made of metal material.

2. The prism device according to claim 1, characterized in that The second assembly is connected to the prism body.

3. The prism device according to claim 1, characterized in that A receiving cavity is formed on a surface of the second assembly facing the first assembly, and the receiving cavity is used to receive the first assembly.

4. The prism device according to claim 3, characterized in that When the first assembly is received in the receiving cavity, the surface of the first assembly facing away from the prism body is connected to the bottom surface of the receiving cavity, and the surface of the first assembly facing the prism body is connected to the plurality of prisms of the prism body.

5. The prism device according to claim 3, characterized in that When the first assembly is completely received in the receiving cavity, a gap is formed between the inner side surface of the receiving cavity and the first assembly.

6. The prism device according to claim 1, characterized in that The prism device further comprises a heat dissipation mechanism, and the heat dissipation mechanism is arranged on a side surface of the second assembly which faces away from the prism body.

7. The prism device according to claim 1, characterized in that At least two adjacent prisms among the plurality of prisms of the prism body are glued together.

8. The prism device according to claim 6, characterized in that The heat dissipation mechanism is a heat dissipation fin disposed on the second assembly or a heat dissipation duct disposed on the surface of the second assembly facing away from the prism body.

9. A projection device, comprising a projection display screen, characterized in that: The projection device further comprises a prism device according to any one of claims 1 to 8 and a light source, and light emitted by the light source is projected onto a projection display screen through the prism device.

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