Projection imaging system

Abstract

This application discloses a projection imaging system, belonging to the field of projection technology. The projection imaging system includes a light source system, an optical engine system, and a lens. The optical engine system includes a prism assembly, a flat light-transmitting assembly, and a light valve. An illumination beam exits from the prism assembly to the flat light-transmitting assembly, and then exits from the flat light-transmitting assembly to the surface of the light valve. The light valve modulates the illumination beam and exits a modulated beam to the flat light-transmitting assembly. Adjacent modulated beams exiting the flat light-transmitting assembly are sequentially exited to the prism assembly and then exited by the prism assembly to the lens. In this application embodiment, by reducing the thickness of the prism assembly, the light-incident side of the lens can be brought as close to the prism assembly as possible without being affected by the convex angles formed on the prism assembly, thus reducing the back focal length of the lens. At this time, the illumination area of ​​the modulated beam exiting the prism assembly on the lenses included in the lens will be reduced, therefore the size of the lenses can be appropriately reduced to lower the design difficulty of the lens.

Description

[0001] This application is based on Chinese Invention Application 202110302299.6 (2021-03-22), Invention Name: Projection Imaging System. TECHNICAL FIELD

[0002] Embodiments of the present application relate to the field of projection technology, in particular to a projection imaging system. BACKGROUND

[0003] With the continuous development of science and technology, projection equipment is increasingly applied to people's work and life. At present, the projection equipment mainly includes a projection imaging system and a projection screen. The projection imaging system includes a light source system, an optical engine system and a lens. The light exit side of the light source system is connected to the light entrance side of the optical engine system. The light exit side of the optical engine system is connected to the light entrance side of the lens. The light exit side of the lens faces the projection screen. The light source system is used to provide an illumination light beam to the optical engine system. The optical engine system is used to modulate the illumination light beam and emit the modulated light beam to the lens for imaging. The lens emits the modulated light beam of the formed image to the projection screen to display a picture on the projection screen. SUMMARY

[0004] Embodiments of the present application provide a projection imaging system, which can facilitate reducing the size of the lens included in the lens and reducing the design difficulty of the lens. The technical solution is as follows:

[0005] A projection imaging system, the projection imaging system comprising:

[0006] a light source system, an optical engine system and a lens;

[0007] the light source system is used to provide an illumination light beam to the optical engine system,

[0008] the optical engine system is used to modulate the illumination light beam and emit the modulated light beam obtained after modulation to the lens for imaging;

[0009] wherein the optical engine system comprises a prism assembly, a flat transparent light assembly and a light valve arranged along the propagation direction of the illumination light beam;

[0010] the illumination light beam is emitted from the prism assembly to the flat transparent light assembly, and then emitted from the flat transparent light assembly to the surface of the light valve;

[0011] the light valve modulates the illumination light beam and emits the modulated light beam to the flat transparent light assembly;

[0012] The flat light-transmitting component vibrates, and the modulated light beam emitted from the flat light-transmitting component at a first moment and the modulated light beam at a second moment adjacent to the first moment are misaligned. The modulated light beam at the first moment and the modulated light beam at the second moment are emitted sequentially to the prism component and then emitted from the prism component to the lens.

[0013] The beneficial effects of the technical solutions provided in this application include at least the following:

[0014] In this embodiment, for the illumination beam within the optomechanical system, after being modulated by the light valve to obtain a modulated beam, the modulated beam first enters the flat light-transmitting component, then exits from the flat light-transmitting component to the prism component, and then exits from the prism component to the lens. At this time, by reducing the thickness of the prism component, the light-incident side of the lens can move as close to the prism component as possible without being affected by the convex angle formed on the prism component, thereby reducing the back focal length of the lens. After the back focal length of the lens is reduced, the illumination area of ​​the modulated beam emitted from the prism component on the lens will be reduced, that is, the illumination area of ​​the modulated beam emitted from the prism component on the lens components will be reduced. Therefore, the size of the lens can be appropriately reduced to reduce the design difficulty of the lens. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the illumination beam path of a projection imaging system provided in an embodiment of this application;

[0017] Figure 2 This is a schematic diagram of the illumination beam path of a projection imaging system provided by related technologies;

[0018] Figure 3 This is a schematic diagram of the illumination beam path of a projection imaging system including a TIR prism, provided by related technologies;

[0019] Figure 4 This is a schematic diagram of the illumination beam path of a projection imaging system including a TIR prism provided in an embodiment of this application;

[0020] Figure 5 This is a schematic diagram of the structure of an optomechanical system provided in an embodiment of this application;

[0021] Figure 6 This is a schematic diagram of the structure of an optomechanical system provided by related technologies;

[0022] Figure 7 This is a schematic diagram of the illumination beam path of another projection imaging system provided in this application embodiment;

[0023] Figure 8 This is a schematic diagram of the illumination beam path of another projection imaging system provided by related technologies;

[0024] Figure 9 This is a schematic diagram of the illumination beam path of another projection imaging system provided in this application embodiment;

[0025] Figure 10 This is an exploded structural diagram of a flat light-transmitting component and a TIR prism fixed according to an embodiment of this application;

[0026] Figure 11 This is a schematic diagram of a flat light-transmitting component and a TIR prism fixing structure provided in an embodiment of this application;

[0027] Figure 12 This is a schematic diagram of the structure of a support body provided in an embodiment of this application;

[0028] Figure 13 This is an exploded structural diagram of another flat light-transmitting component and TIR prism fixed according to an embodiment of this application.

[0029] Figure label:

[0030] 1: Optical and mechanical system; 2: Lens;

[0031] 11: Prism assembly; 12: Flat plate light transmission assembly; 13: Light valve; 14: Optical engine housing; 15: Prism support; 16: Fixing bracket;

[0032] 111: TIR prism; 112: RTIR prism;

[0033] 1111: First prism; 1112: Second prism; 1113: Convex angle; 1121: Third prism; 1122: Fourth prism; 1123: Plane glass;

[0034] 151: Support body; 152: Limiting component;

[0035] 1511: Light-transmitting hole; 1512: First support structure; 1513: Second support structure; 1514: Support point. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the implementation methods of this application will be further described in detail below with reference to the accompanying drawings.

[0037] Figure 1A schematic diagram illustrating the path of an illumination beam in a projection imaging system according to an embodiment of this application is provided. Figure 1 As shown, the projection imaging system includes: a light source system, an optical-mechanical system 1, and a lens 2. The light source system provides an illumination beam to the optical-mechanical system 1, which modulates the illumination beam and outputs the modulated beam to the lens 2 for imaging. The optical-mechanical system 1 includes a prism assembly 11, a flat light-transmitting assembly 12, and a light valve 13 arranged along the propagation direction of the illumination beam. The illumination beam exits from the prism assembly 11 to the flat light-transmitting assembly 12, and then from the flat light-transmitting assembly 12 to the surface of the light valve 13. The light valve 13 modulates the illumination beam and outputs the modulated beam to the flat light-transmitting assembly 12. The flat light-transmitting assembly 12 vibrates, and the modulated beam at a first moment and the modulated beam at a second moment adjacent to the first moment are misaligned. The modulated beams at the first and second moments are sequentially output to the prism assembly 11 and then from the prism assembly 11 to the lens 2.

[0038] In related technologies, such as Figure 2 As shown, the optomechanical system 1 includes a prism assembly 11, an optical valve 13, and a planar light-transmitting assembly 12 arranged along the propagation direction of the illumination beam. The illumination beam is emitted from the prism assembly 11 to the surface of the optical valve 13. The optical valve 13 modulates the illumination beam and emits the modulated beam to the prism assembly 11, and then emits it from the prism assembly 11 to the planar light-transmitting assembly 12. The planar light-transmitting assembly 12 vibrates to achieve the misalignment of the modulated beams at two adjacent moments. Then, the modulated beams at two adjacent moments are emitted sequentially to the lens 2.

[0039] In order to reduce the back focal length of lens 2 in the related technology, if the thickness of prism assembly 11 is reduced, prism assembly 11 will form a convex angle 1113. Under the influence of the convex angle 1113, due to the large size of the planar light-transmitting assembly, the planar light-transmitting assembly 12 cannot effectively move towards the prism assembly 11, thus failing to effectively reduce the back focal length of lens 2 in the related technology.

[0040] For example, taking prism assembly 11 as a TIR (Total Internal Reflection) prism, such as... Figure 3As shown, the TIR prism 111 includes a first prism 1111 and a second prism 1112. The first side surface of the first prism 1111 and the first side surface of the second prism 1112 are attached together. The illumination beam is incident along the second side surface of the first prism 1111 and exits along the third side surface of the first prism 1111 to the surface of the light valve 13. The modulated beam after being modulated by the light valve 13 is incident on the first prism 1111 and exits along the second side surface of the second prism 1112 to the flat light-transmitting component 12. However, in order to ensure that the entire illumination beam is incident along the second side surface of the first prism 1111, it is difficult to reduce the thickness of the first prism 1111. The thickness of the TIR prism 111 can only be reduced by reducing the thickness of the second prism 1112. After the thickness of the second prism 1112 is reduced, as... Figure 3 As shown, the corner of the first prism 1111 will protrude to form a convex corner 1113, which in turn affects the movement of the flat light-transmitting assembly 12 toward the TIR prism 111.

[0041] In this embodiment, the illumination beam within the optomechanical system 1, after being modulated by the light valve 13 to obtain a modulated beam, first enters the flat light-transmitting component 12, then exits from the flat light-transmitting component 12 to the prism component 11, and finally exits from the prism component 11 to the lens 2. At this point, by reducing the thickness of the prism component 11, such as... Figure 4 As shown, taking the prism assembly 11 as a TIR prism 111 as an example, the light-incident side of the lens 2 can move as close as possible to the TIR prism 111 without being affected by the convex angle 1113 formed on the TIR prism 111, thereby reducing the back focal length of the lens 2. After the back focal length of the lens 2 is reduced, the illumination area of ​​the modulated beam emitted from the TIR prism 111 on the lens 2 will be reduced, that is, the illumination area of ​​the modulated beam emitted from the TIR prism 111 on the lens 2 will be reduced. Therefore, the size of the lens can be appropriately reduced to reduce the design difficulty of the lens 2.

[0042] Optionally, the projection of the light-incident side of the lens 2 onto the prism assembly 11 is located within the region of the first light-emitting side of the prism assembly 11. The first light-emitting side refers to the side of the prism assembly 11 from which the modulated beam is emitted.

[0043] Taking the prism assembly 11 as a TIR prism 111 as an example, the first light-emitting side of the prism assembly 11 refers to the second side of the second prism 1112. At this time, the projection of the light-incident side of the lens 2 on the prism assembly 11 is located in the area where the second side of the second prism 1112 is located.

[0044] In this way, when the lens 2 moves towards the prism assembly 11 on the light-incident side, the influence of the convex angle 1113 formed by the TIR prism 111 can be completely avoided, allowing the lens 2 to move closer to the TIR prism 111, thereby further reducing the back focal length of the lens 2.

[0045] Furthermore, the principal optical axis of lens 2 is perpendicular to the plane containing the first light-emitting side of prism assembly 11. In this way, when the light-incident side of lens 2 approaches prism assembly 11, interference that may occur between the edge of prism assembly 11 and the edge of the light-incident side of lens 2 is avoided, thereby better ensuring the proximity of lens 2 to prism assembly 11.

[0046] In this application embodiment, red, green, and blue three-primary-color solid-state lasers are used as the light source system, or solid-state lasers are used to excite fluorescent materials as the light source system, or solid-state lasers are used in combination with LED (Light-Emitting Diode) light sources as the light source system.

[0047] Fluorescent material refers to a device that can convert a single-color light beam into a three-color light beam. For example, fluorescent material is a fluorescent wheel with phosphor.

[0048] In this embodiment, the optomechanical system 1 further includes a light guide, a reflector, and a lens assembly arranged along the propagation direction of the illumination beam; the illumination beam passes through the light guide and is incident on the lens assembly, and after being transmitted through the lens assembly, it is reflected by the reflector to the prism assembly 11. The light guide is used to homogenize the illumination beam so that the light spot formed after the illumination beam exits has a certain shape.

[0049] In addition to using a light guide to homogenize the illumination beam, a compound eye lens can also be used for homogenization of the illumination beam; however, this application does not limit the specific application in this regard. The lens structure and number of lenses included in the lens assembly can be referenced from related technologies, and this application does not limit the specific application in this regard.

[0050] like Figure 5 As shown, the optical-mechanical system 1 includes an optical-mechanical housing 14, a prism assembly 11, a flat light-transmitting assembly 12, and a light valve 13, which are fixed inside the optical-mechanical housing 14.

[0051] In related technologies, such as Figure 6 As shown, since the flat light-transmitting component 12 is located between the prism component 11 and the lens 2, and the flat light-transmitting component 12 is far from the inner wall of the optical engine housing 14, a mounting bracket is needed as a medium to install the flat light-transmitting component 12. The use of the mounting bracket undoubtedly increases the distance between the prism component 11 and the lens 2, thereby increasing the back focal length of the lens 2. For example, taking the prism component 11 as a TIR prism 111, when installing the flat light-transmitting component 12 using the mounting bracket, a gap of 11.3 mm needs to be reserved between the TIR prism 111 and the lens 2.

[0052] In this embodiment, the flat light-transmitting component 12 is located between the light valve 13 and the prism component 11. For the light valve 13, a through-hole is typically provided on the optical engine housing 14, and the light valve 13 is then embedded in the area of ​​the through-hole and fixed to the optical engine housing 14. In this case, as... Figure 5 As shown, the flat light-transmitting component 12 can be directly attached to the inner wall of the optical engine housing 14 for fixation, thereby avoiding the use of a mounting bracket. This further reduces the distance between the surface of the light valve 13 and the light-incident side of the lens 2, resulting in a further reduction in the back focal length of the lens 2. For example, taking the prism component 11 as a TIR prism 111, when the flat light-transmitting component 12 is directly fixed to the inner wall of the optical engine housing 14, a gap of 6.6 mm needs to be reserved between the light valve 13 and the prism component 11.

[0053] Thus, combined Figure 7 and Figure 8 In this embodiment of the application, the illumination area of ​​the illumination beam emitted from the TIR prism 111 on the lens 2 will be reduced, thereby reducing the size of the lens included in the lens 2 and reducing the design difficulty of the lens 2.

[0054] In this embodiment, the optomechanical system 1 includes a control component, and the flat-panel light transmission component 12 includes a bracket and a flat-panel light transmission mirror. The bracket is fixed inside the optomechanical housing 14, and the flat-panel light transmission mirror is fixed on the bracket. The control component is used to control the vibration of the bracket, thereby driving the flat-panel light transmission mirror to vibrate, so as to emit a modulated light beam that is misaligned at adjacent moments.

[0055] The structure of the support can refer to relevant technologies, and this application embodiment does not limit it. The flat light-transmitting lens can be made of a material with high light transmittance, so that when the illumination beam emitted from the prism assembly 11 is emitted from the flat light-transmitting assembly 12 to the surface of the light valve 13, the loss of the illumination beam is reduced.

[0056] Optionally, the thickness of the flat lens is 2 mm. Of course, the thickness of the flat lens can also be other values, and this application does not limit this.

[0057] During the vibration of the support, the mirror continuously switches between a first position and a second position to achieve continuous switching between the first and second positions. When the mirror switches from the first position to the second position, or from the second position to the first position, the time corresponding to the mirror being in the first position and the time corresponding to the mirror being in the second position are respectively the first time and the second time mentioned above.

[0058] Optionally, the first position refers to the initial position of the support when it is not vibrating, and the second position refers to the vibration position of the support after it vibrates; or, both the first position and the second position are the vibration positions of the support after it vibrates, and the first position and the second position are the vibration positions corresponding to the support after it vibrates in different directions.

[0059] In some embodiments, the flat light-transmitting component 12 vibrates in a first direction and a second direction. The first direction is parallel to the long side of the rectangular image formed by the lens 2, and the second direction is parallel to the short side of the rectangular image formed by the lens 2.

[0060] Optionally, the vibration of the flat light-transmitting component 12 in the first direction and the vibration in the second direction occur synchronously. In this case, the flat light-transmitting component 12 is located in the first position after resetting together in the first and second directions, and in the second position after vibrating together in the first and second directions. Alternatively, the vibration of the flat light-transmitting component 12 in the first direction and the vibration in the second direction occur asynchronously. In this case, the flat light-transmitting component 12 is located in the first position after vibrating in the first direction and resetting in the second direction, and in the second position after resetting in the first direction and vibrating in the second direction.

[0061] In other embodiments, the flat light-transmitting component 12 vibrates in a third direction, which is a direction parallel to the diagonal of the rectangular image formed by the lens 2. After resetting in the third direction, the flat light-transmitting component 12 is in a first position, and after vibrating in the third direction, it is in a second position.

[0062] In this embodiment, the prism assembly 11 is either a TIR prism 111 or an RTIR prism 112. When the prism assembly 11 is a TIR prism 111, the distance between the surface of the light valve 13 and the TIR prism 111 is less than or equal to 8 mm. For example, the distance between the surface of the light valve 13 and the TIR prism 111 is 6.6 mm. When the prism assembly 11 is an RTIR (Refraction Total Internal Reflection) prism, the distance between the surface of the light valve 13 and the RTIR prism 112 is less than or equal to 11 mm. For example, the distance between the surface of the light valve 13 and the RTIR prism 112 is 9.5 mm.

[0063] In addition, when the prism assembly 11 is an RTIR prism 112, placing the flat light transmission assembly 12 between the light valve 13 and the RTIR prism 112 can also avoid interference from the circuit board inside the optical engine housing 14, thereby facilitating the fixed installation of the flat light transmission assembly 12 inside the optical engine housing 14.

[0064] The structure of the TIR prism 111 is as described in the above embodiment, such as...Figure 4 As shown, the illumination beam is incident along the second side of the first prism 1111, and after total internal reflection at the mating surface of the first prism 1111 and the second prism 1112, it exits along the third side of the first prism 1111 and reaches the flat light transmission assembly 12. The modulated beams that exit from the flat light transmission assembly 12 at adjacent moments are incident along the third side of the first prism 1111, and after passing through the mating surface of the first prism 1111 and the second prism 1112, they exit along the second side of the second prism 1112 and reach the lens 2.

[0065] Optionally, the third side surface of the first prism 1111 is parallel to the second side surface of the second prism 1112, thereby ensuring that the surface of the light valve 13 is parallel to the plane containing the light incident side of the lens 2.

[0066] The structure of the RTIR prism 112 can be referenced from related technologies, and this application does not limit it in this embodiment. For example, as... Figure 9 As shown, the RTIR prism 112 includes a third prism 1121, a flat glass 1123, and a fourth prism 1122. The first side of the fourth prism 1122 is curved and has a reflective material fixed to it. The two sides of the flat glass 1123 are respectively attached to the first side of the third prism 1121 and the second side of the fourth prism 1122. The illumination beam is incident on the fourth prism 1122 along the third side of the fourth prism 1122, and is totally reflected at the contact surface between the flat glass 1123 and the fourth prism 1122, returning to the first side of the fourth prism 1122. The light beam is totally reflected by the reflective material and enters the flat glass 1123. It is then refracted at the bonding surface between the flat glass 1123 and the third prism 1121 and enters the third prism 1121. After that, it exits along the second side of the third prism 1121 and enters the flat light transmission assembly 12. The modulated light beam that exits from the flat light transmission assembly 12 at adjacent moments is incident on the third prism 1121 through the second side of the third prism 1121 and enters the third prism 1121. After being totally reflected at the bonding surface between the third prism 1121 and the flat glass 1123, it exits along the third side of the third prism 1121 and enters the lens 2.

[0067] Optionally, the second side of the third prism 1121 is perpendicular to the third side, thereby reducing the distance of the modulated beam from the surface of the light valve 13 to the lens 2.

[0068] In this embodiment, in order to ensure that the distance between the light-incident side of the lens 2 and the prism assembly 11 is small enough, the principal optical axis of the lens 2 is perpendicular to the plane where the second light-out side of the prism assembly 11 is located. That is, the plane where the light-incident side of the lens 2 is located is parallel to the plane where the second light-out side of the prism assembly 11 is located, so as to better ensure that the lens 2 moves closer to the prism assembly 11.

[0069] In this embodiment, the flat light-transmitting component 12 and the prism component 11 can be fixed separately within the optical engine housing 14, or they can be fixed as a whole within the optical engine housing 14. The fixing method of the RTIR prism 112 is similar to that of the TIR prism 111. The fixing of the TIR prism 111 will be described below using the prism component 111 as an example.

[0070] The first case, such as Figure 10 As shown, the flat light-transmitting component 12 and the TIR prism 111 are separately fixed inside the optical engine housing 14. At this time, the flat light-transmitting component 12 can be directly fixed to the inner wall of the optical engine housing 14 through the bracket included in the flat light-transmitting component 12, so as to achieve direct fixation of the flat light-transmitting component 12.

[0071] For the TIR prism 111, since there is a flat light-transmitting component 12 between the TIR prism 111 and the inner wall of the optical engine housing 14, a positioning post protrudes from the inner wall of the optical engine housing 14, thereby fixing the TIR prism 111 on the positioning post and achieving direct fixation with the optical engine housing 14.

[0072] Some of the positioning posts can form support posts, and some of the positioning posts can form fixing posts, so that the TIR prism 111 is supported on the support posts and pressed onto the TIR prism by the fasteners and fixed on the fixing posts, thereby fixing the TIR prism 111.

[0073] In conjunction with the above explanation of the TIR prism 111, the first prism 1111 rests against the support post, and the fixing member is pressed against the first prism 1111 and fixedly connected to the fixing post, so as to achieve a fixed connection between the TIR prism 111 and the optomechanical housing 14.

[0074] Of course, if the TIR prism 111 is directly fixed to the positioning post, the projection of the TIR prism 111 onto the inner wall of the optical engine housing 14 needs to cover the projection of the flat light-transmitting component 12 onto the inner wall of the optical engine housing 14. This results in an excessively large cross-sectional area for the TIR prism 111, leading to excessively high costs. Therefore, as... Figure 10 As shown, the optomechanical system 1 also includes a prism bracket 15, on which the TIR prism 111 is fixed, and the prism bracket 15 is fixed inside the optomechanical housing 14.

[0075] Optionally, the prism bracket 15 is a fixing clip, in which case the TIR prism 111 is clamped on the fixing clip, and then the fixing clip is fixed on the positioning post protruding from the inner wall of the optical engine housing 14, so as to achieve the fixing of the TIR prism 111 and the optical engine housing 14, while reducing the cost of the TIR prism 111.

[0076] Optionally, such as Figure 10 orFigure 11 As shown, the prism support 15 includes a support body 151 and a limiting member 152. The support body 151 has a limiting mechanism and a light-transmitting hole 1511. The support body 151 is fixed on the optical engine housing 14, and the limiting member 152 is fixed on the support body 151. The limiting member 152 is used to cooperate with the limiting mechanism to limit the TIR prism 111 on the support body 151, and the first light-emitting side of the TIR prism 111 faces the light-transmitting hole 1511.

[0077] Since the support body 151 has a light-transmitting hole 1511, the illumination beam can pass through the TIR prism 111, and after passing through the flat light-transmitting component 12, it is emitted to the light valve 13. Then, the modulated beam, after being vibrated by the flat light-transmitting component 12, is emitted through the light-transmitting hole 1511 to the TIR prism 111. In addition, based on the above explanation of the TIR prism 111, the first prism 1111 is limited by a limiting mechanism, and the first prism 1111 or the second prism 1112 is pressed by a limiting member 152 to fix the TIR prism 111 on the support body 151.

[0078] In some embodiments, the limiting mechanism is a limiting groove, the light-transmitting hole 1511 is located at the bottom of the limiting groove, and the first light-emitting side of the TIR prism 111 is limited within the limiting groove.

[0079] The size of the limiting groove can be set according to the area of ​​the first light-emitting side of the TIR prism 111, so as to prevent the TIR prism 111 from shaking after the first light-emitting side of the TIR prism 111 is limited in the limiting groove.

[0080] In other embodiments, the limiting mechanism includes a first bearing structure 1512, that is, as shown in the figure. Figure 11 or Figure 12 As shown, the support body 151 has a first supporting structure 1512, at which time the first light-incident side of the TIR prism 111 rests against the first supporting structure 1512. In this way, by limiting the first light-incident side of the TIR prism 111 by the first supporting structure 1512, the TIR prism 111 is prevented from moving in a direction perpendicular to the first light-incident side.

[0081] To prevent the first support structure 1512 from blocking the illumination beam incident on the prism assembly 11, the first support structure 1512 includes at least two collinear blocking blocks. For example, the first support structure 1512 includes two blocking blocks, and the two blocking blocks respectively block the end on the first light-incident side.

[0082] Furthermore, the limiting mechanism also includes a second supporting structure 1513, that is, as... Figure 11 or Figure 12As shown, the support body 151 has a second support structure 1513. At this time, the first side of the TIR prism 111 supports the second support structure 1513, and the first side is adjacent to the first incident light side.

[0083] The specific structure of the second supporting structure 1513 can be referred to that of the first supporting structure 1512, and will not be described again in this embodiment. Based on the above explanation of the TIR prism 111, the bottom surface of the first prism 1111 serves as the first side of the TIR prism 111. In this way, the first supporting structure 1512 and the second supporting structure 1513 can limit the TIR prism 111 in the X and Y directions, and then the limiting member 152 further limits the TIR prism 111 in the Z direction, ensuring the stability of the TIR prism 111.

[0084] Optionally, for the two structures of the limiting mechanism described above, the limiting member 152 is a clamping spring that presses against the TIR prism 111. The clamping spring presses against either the first prism 1111 or the second prism 1112 included in the TIR prism 111 to achieve a fixed connection between the TIR prism 111 and the support body 151. This embodiment of the application does not limit this aspect.

[0085] Of course, the limiting member 152 can be any structure other than the clamping spring, as long as it can clamp the TIR prism 111. This application embodiment does not limit this.

[0086] In some other embodiments, the limiting mechanism includes a second bearing structure 1513, on which the first side of the TIR prism 111 rests; the limiting member 152 is an adjusting screw, and the bracket body 151 also has a protrusion, through which the adjusting screw passes and is threadedly connected, with one end of the adjusting screw abutting against the second side of the TIR prism 111, the first side being opposite to the second side.

[0087] In conjunction with the above explanation of the TIR prism 111, the two bottom surfaces of the first prism 1111 serve as the first side and the second side of the TIR prism 111, respectively. Thus, the second supporting structure 1513 can limit the first side of the TIR prism 111, and then, with the adjusting screw abutting against the second side of the TIR prism 111, the TIR prism 111 is clamped between the second supporting structure 1513 and the adjusting screw, thereby ensuring the stability of the TIR prism 111.

[0088] It should be noted that the TIR prism 111 is directly supported on the support body 151, or as... Figure 12As shown, the support body 151 has at least three non-collinear support points 1514, and the TIR prism 111 is supported on these three support points 1514. This reduces the contact area between the TIR prism 111 and the support body 151 by using at least three support points 1514, thereby reducing manufacturing difficulty and further ensuring the flatness of the surfaces containing the at least three support points 1514. For example, there are four support points 1514, which form a rectangle.

[0089] Next, in conjunction with the above description, an exemplary explanation will be given regarding the fixing of the flat light-transmitting assembly 12 and the TIR prism 111. For example... Figure 10 As shown, the flat light-transmitting component 12 is directly fixed inside the optical engine housing 14. The TIR prism 111 is supported by the first support structure 1512 and the second support structure 1513, and is pressed and fixed on the bracket body 151 by two clamping springs. The bracket body 151 is fixed inside the optical engine housing 14.

[0090] In the second scenario, the flat light-transmitting assembly 12 and the TIR prism 111 are fixed as a whole within the optical engine housing 14. In this case, as... Figure 13 As shown, the optical engine system 1 also includes a fixed bracket 16, on which the flat light transmission component 12 and the TIR prism 111 are fixed. The fixed bracket 16 is fixed inside the optical engine housing 14.

[0091] In some embodiments, the fixed bracket 16 has a planar structure, the fixed bracket 16 has a light-transmitting hole 1511, the flat light-transmitting component 12 is fixed on the first side of the fixed bracket 16 and fits against the inner wall of the optical engine housing 14, and the TIR prism 111 is fixed on the second side of the fixed bracket 16.

[0092] The light-transmitting hole 1511 of the fixed bracket 16 can be compared with the light-transmitting hole 1511 of the bracket body 151 described above. Furthermore, to ensure that the distance between the flat light-transmitting component 12 and the TIR prism 111 is 1 mm, and to simultaneously ensure the strength of the fixed bracket 16, a groove is provided on either the first or second side of the fixed bracket 16. When the first side of the fixed bracket 16 has a groove, the flat light-transmitting component 12 is confined within the groove; when the second side of the fixed bracket 16 has a groove, the TIR prism 111 is confined within the groove.

[0093] To ensure that flat light-transmitting components 12 of different sizes can be fixed on the fixing bracket 16, the fixing bracket 16 optionally has multiple elongated holes, each containing a fixing bolt. The fixing bolt can slide within the corresponding elongated hole and is used for fixed connection with the flat light-transmitting component 12. Thus, due to the sliding nature of the fixing bolt, for flat light-transmitting components 12 of different sizes, simply sliding the fixing bolt to the appropriate position within the elongated hole is sufficient to achieve a fixed connection between the fixing bolt and the flat light-transmitting component 12, thereby fixing the flat light-transmitting component 12 on the fixing bracket 16 and avoiding the need to redesign the fixing bracket 16 for different sizes of flat light-transmitting components 12.

[0094] The method by which the TIR prism 111 is fixed on the second side of the fixed bracket 16 can refer to the method described above for fixing the TIR prism 111 to the bracket body 151, and will not be repeated in this embodiment. For example, the second side of the fixed bracket 16 has a first support structure and a second support structure. The TIR prism 111 rests against the first support structure and the second support structure, and is pressed and fixed to the second side of the fixed bracket 16 by a clamping spring.

[0095] In this embodiment, the illumination beam emitted from the light source system is modulated by a light valve, passes through a flat light-transmitting component, and then through a prism component before exiting the lens. This, combined with the light valve's fixing method, allows the flat light-transmitting component to be fixed against the inner wall of the optical engine housing, thus avoiding the need for a mounting bracket. This prevents the mounting bracket's thickness from increasing the lens's back focal length, effectively shortening it. Consequently, the area of ​​the modulated beam emitted from the prism component that illuminates the lens, including the lens elements, is reduced, allowing for a smaller lens size and simplified lens design.

[0096] The above description is merely an illustrative embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present application should be included within the protection scope of the present application.

Claims

1. A projection imaging system, characterized by, The projection imaging system comprises: a light source system, an optical-mechanical system and a lens; the light source system is configured to provide an illumination light beam to the optical-mechanical system, the optical-mechanical system is configured to modulate the illumination light beam and to emit the modulated light beam obtained after modulation to the lens for imaging; wherein the optical-mechanical system comprises a prism assembly, a flat transparent light assembly and a light valve arranged along the propagation direction of the illumination light beam; the illumination light beam is emitted from the prism assembly to the flat transparent light assembly and then emitted from the flat transparent light assembly to the surface of the light valve; the light valve modulates the illumination light beam and emits the modulated light beam to the flat transparent light assembly; the flat transparent light assembly vibrates to realize the misalignment of the modulated light beams at two time points, and the flat transparent light assembly switches from the first position to the second position or from the second position to the first position, the corresponding time point when the flat transparent light assembly is in the first position and the corresponding time point when the flat transparent light assembly is in the second position are the first time point and the second time point in the above-mentioned two time points respectively, the modulated light beams with misalignment at adjacent time points emitted from the flat transparent light assembly are sequentially emitted to the prism assembly and then emitted from the prism assembly to the lens; wherein, after reducing the thickness of the prism assembly, the light entrance side of the lens can approach the prism assembly without being affected by the convex angle formed on the prism assembly, thereby realizing the reduction of the back focal length of the lens; the surface of the light valve is parallel to the plane where the light entrance side of the lens is located, the main optical axis of the lens is perpendicular to the plane where the first light exit side of the prism assembly is located, and the first light exit side refers to the side where the prism assembly emits the modulated light beam.

2. The projection imaging system of claim 1, wherein, The optical-mechanical system further comprises a light guide tube or compound eye lens, a mirror and a lens assembly arranged along the propagation direction of the illumination light beam, the illumination light beam passes through the light guide tube or compound eye lens and is incident on the lens assembly, is transmitted through the lens assembly and is reflected by the mirror to the prism assembly.

3. The projection imaging system of claim 1, wherein, The flat transparent light assembly vibrates in a first direction and a second direction, the first direction refers to a direction parallel to the long side of the rectangular image formed by the lens, and the second direction refers to a direction parallel to the short side of the rectangular image formed by the lens, or the flat transparent light assembly vibrates in a third direction, the third direction refers to a direction parallel to the diagonal line of the rectangular image formed by the lens.

4. The projection imaging system of claim 1, wherein, The prism assembly, the flat transparent light assembly and the light valve are fixed in an optical-mechanical shell, and a through hole is arranged on the optical-mechanical shell, the light valve is inlaid in the area where the through hole is located and is fixed with the optical-mechanical shell, and the flat transparent light assembly is directly fixed to the inner wall of the optical-mechanical shell.

5. The projection imaging system of claim 1, wherein, The prism assembly is a TIR prism, the TIR prism comprises a first prism and a second prism, an illumination light beam is incident along a second side of the first prism, and is totally reflected at a bonding surface of the first prism and the second prism to be incident along a third side of the first prism to the flat-plate light-transmitting assembly; adjacent time modulation light beams with misalignment emitted through the flat-plate light-transmitting assembly are incident along the third side of the first prism to the first prism, and are transmitted through the bonding surface of the first prism and the second prism to be emitted along a second side of the second prism to the lens; wherein the third side of the first prism is parallel to the second side of the second prism.

6. The projection imaging system of claim 1, wherein, The prism assembly is a RTIR prism, the RTIR prism comprises a third prism, a flat glass and a fourth prism, a first side of the fourth prism is a curved surface; an illumination light beam is incident along a third side of the fourth prism to the fourth prism, is totally reflected at a bonding surface of the flat glass and the fourth prism to the first side of the fourth prism, is totally reflected to the flat glass, and is refracted at a bonding surface of the flat glass and the third prism to the third prism, and is then emitted along a second side of the third prism to the flat-plate light-transmitting assembly; adjacent time modulation light beams with misalignment emitted through the flat-plate light-transmitting assembly are incident through the second side of the third prism to the third prism, and are totally reflected at a bonding surface of the third prism and the flat glass to be emitted along a third side of the third prism to the lens; wherein the second side of the third prism is perpendicular to the third side.

7. The projection imaging system of claim 1, wherein, The prism assembly, the flat-plate light-transmitting assembly and the light valve are fixed in the optical-mechanical shell, and the flat-plate light-transmitting assembly is directly fixed to an inner wall of the optical-mechanical shell through a support; Part of the positioning columns forms a bearing column, and part of the positioning columns forms a fixing column, the prism assembly is supported on the bearing column, and is pressed on the prism assembly through a fixing member and is fixed on the fixing column.

8. The projection imaging system of claim 1, wherein, The prism assembly, the flat-plate light-transmitting assembly and the light valve are fixed in the optical-mechanical shell, and the optical-mechanical system further comprises a fixing support, the flat-plate light-transmitting assembly and the prism assembly are fixed on the fixing support, the fixing support has a planar structure and a light-transmitting hole, the flat-plate light-transmitting assembly is fixed on a first side of the fixing support and is in abutment with an inner wall of the optical-mechanical shell, and the prism assembly is fixed on a second side of the fixing support.

9. The projection imaging system of claim 8, wherein, The fixing support has a plurality of oblong holes, and each oblong hole has a fixing bolt; the fixing bolt can slide in the corresponding oblong hole, and the fixing bolt is used for fixed connection with the flat-plate light-transmitting assembly.

10. The projection imaging system of claim 1, wherein, The light source system comprises red, green and blue three primary color solid-state lasers.

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