CN112859496A

CN112859496A - Projection imaging system

Info

Publication number: CN112859496A
Application number: CN202110302299.6A
Authority: CN
Inventors: 李晓平; 刘显荣; 黄永达
Original assignee: Qingdao Hisense Laser Display Co Ltd
Current assignee: Qingdao Hisense Laser Display Co Ltd
Priority date: 2021-03-22
Filing date: 2021-03-22
Publication date: 2021-05-28
Anticipated expiration: 2041-03-22
Also published as: CN112859496B; CN115561954A

Abstract

The embodiment of the application discloses a projection imaging system, and belongs to the technical field of projection. The projection imaging system includes: a light source system, an optical-mechanical system and a lens; the optical-mechanical system comprises a prism assembly, a flat plate light-transmitting assembly and a light valve; the illumination light beam is emitted from the prism component to the flat light-transmitting component and then is emitted to the surface of the light valve by the flat light-transmitting component; the light valve modulates the illumination light beam and then emits a modulated light beam to the flat light-transmitting component; the modulated light beams emitted by the flat light-transmitting component and staggered at adjacent moments are sequentially emitted to the prism component and are emitted to the lens from the prism component. In the embodiment of the application, after the thickness of the prism assembly is reduced, the light inlet side of the lens can be close to the prism assembly to the maximum extent under the influence of the convex angle formed on the prism assembly, the reduction of the back focal length of the lens is realized, and the irradiation area of the modulation light beam emitted by the prism assembly on the lens included by the lens is reduced, so that the size of the lens can be properly reduced, and the design difficulty of the lens is reduced.

Description

Projection imaging system

Technical Field

The embodiment of the application relates to the technical field of projection, in particular to a projection imaging system.

Background

With the continuous development of science and technology, projection equipment is more and more applied to the work and the life of people. At present, projection equipment mainly comprises a projection imaging system and a projection screen, wherein the projection imaging system comprises a light source system, an optical mechanical system and a lens, the light emitting side of the light source system is connected with the light incident side of the optical mechanical system, the light emitting side of the optical mechanical system is connected with the light incident side of the lens, and the light emitting side of the lens faces the projection screen. The light source system is used for providing illumination light beams for the optical-mechanical system, the optical-mechanical system is used for modulating the illumination light beams and emitting the modulated light beams obtained after modulation to the lens for imaging, and the lens emits the modulated light beams of the formed images to the projection screen so as to display images on the projection screen.

Disclosure of Invention

The embodiment of the application provides a projection imaging system, which can be convenient for reducing the size of a lens included by a lens and reduce the design difficulty of the lens. The technical scheme is as follows:

a projection imaging system, the projection imaging system comprising:

a light source system, an optical-mechanical system and a lens;

the light source system is used for providing an illuminating light beam to the optical-mechanical system,

the optical-mechanical system is used for modulating the illumination light beam and emitting the modulated light beam obtained after modulation to the lens for imaging;

the optical-mechanical system comprises a prism assembly, a flat-plate light-transmitting assembly and a light valve which are arranged along the propagation direction of the illumination light beam;

the illumination light beams are emitted from the prism assembly to the flat light-transmitting assembly and then are emitted from the flat light-transmitting assembly to the surface of the light valve;

the light valve modulates the illumination light beam and then emits the modulated light beam to the flat plate light-transmitting component;

the flat light-transmitting component vibrates, a modulated light beam at a first moment and a modulated light beam at a second moment adjacent to the first moment are staggered, and the modulated light beam at the first moment and the modulated light beam at the second moment are sequentially emitted to the prism component and then emitted to the lens.

The technical scheme provided by the embodiment of the application has the beneficial effects that at least:

in the embodiment of the application, after the illumination light beam in the optical-mechanical system is modulated by the light valve to obtain the modulated light beam, the modulated light beam firstly enters the flat light-transmitting component, then exits from the flat light-transmitting component to the prism component and further exits from the prism component to the lens, at the moment, after the thickness of the prism component is reduced, the light-entering side of the lens can approach the prism component to the greatest extent without being influenced by a convex angle formed on the prism component, so that the reduction of the back focal length of the lens is realized; after the back focal length of the lens is reduced, the illumination area of the modulated light beam emitted by the prism assembly on the lens is reduced, that is, the illumination area of the modulated light beam emitted by the prism assembly on the lens included by the lens is reduced, so that the size of the lens can be properly reduced to reduce the design difficulty of the lens.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic diagram of an illumination beam path of a projection imaging system according to an embodiment of the present disclosure;

FIG. 2 is a schematic illustration of an illumination beam path of a projection imaging system provided in the related art;

FIG. 3 is a schematic illustration of an illumination beam path of a projection imaging system including a TIR prism provided in the related art;

FIG. 4 is a schematic illustration of an illumination beam path of a projection imaging system including a TIR prism as provided by an embodiment of the present application;

fig. 5 is a schematic structural diagram of an optical-mechanical system according to an embodiment of the present disclosure;

FIG. 6 is a schematic diagram of an opto-mechanical system according to the related art;

FIG. 7 is a schematic diagram of an illumination beam path of another projection imaging system provided by an embodiment of the present application;

FIG. 8 is a schematic illustration of an illumination beam path of another projection imaging system provided by the related art;

FIG. 9 is a schematic diagram of an illumination beam path of yet another projection imaging system provided by an embodiment of the present application;

FIG. 10 is a schematic diagram of an exploded structure of a flat sheet light-transmitting component and a TIR prism fixture according to an embodiment of the present application;

FIG. 11 is a schematic diagram of a flat-sheet light-transmitting component and TIR prism attachment structure provided by an embodiment of the present application;

FIG. 12 is a schematic structural diagram of a stent body according to an embodiment of the present application;

fig. 13 is a schematic diagram of another exploded structure of a flat sheet light-transmitting component and TIR prism fixture provided in the embodiments of the present application.

Reference numerals:

1: an opto-mechanical system; 2: a lens;

11: a prism assembly; 12: a flat sheet light-transmitting component; 13: a light valve; 14: a light machine shell; 15: a prism holder; 16: fixing a bracket;

111: a TIR prism; 112: an RTIR prism;

1111: a first prism; 1112: a second prism; 1113: a lobe; 1121: a third prism; 1122: a fourth prism; 1123: a flat glass;

151: a stent body; 152: a limiting member;

1511: a light-transmitting hole; 1512: a first bearing structure; 1513: a second bearing structure; 1514: and (4) supporting points.

Detailed Description

To make the objects, technical solutions and advantages of the embodiments of the present application more clear, the embodiments of the present application will be further described in detail with reference to the accompanying drawings.

FIG. 1 illustrates a schematic path diagram of an illumination beam of a projection imaging system according to an embodiment of the present application. As shown in fig. 1, the projection imaging system includes: a light source system, an optical-mechanical system 1 and a lens 2; the light source system is used for providing an illumination light beam for the optical-mechanical system 1, and the optical-mechanical system 1 is used for modulating the illumination light beam and emitting the modulated light beam obtained after modulation to the lens 2 for imaging. The optical-mechanical system 1 comprises a prism assembly 11, a flat-plate light-transmitting assembly 12 and a light valve 13 which are arranged along the propagation direction of an illumination light beam; the illumination light beam is emitted from the prism component 11 to the flat light-transmitting component 12, and then is emitted from the flat light-transmitting component 12 to the surface of the light valve 13; the light valve 13 modulates the illumination beam and emits a modulated beam to the flat light-transmitting component 12; the flat light-transmitting component 12 vibrates, the modulated light beam at the first moment and the modulated light beam at the second moment adjacent to the first moment, which are emitted through the flat light-transmitting component 12, are dislocated, and the modulated light beam at the first moment and the modulated light beam at the second moment are sequentially emitted to the prism component 11 and are emitted to the lens 2 through the prism component 11.

In the related art, as shown in fig. 2, the optical-mechanical system 1 includes a prism assembly 11, a light valve 13 and a flat light-transmitting assembly 12 arranged along the propagation direction of an illumination beam, wherein the illumination beam exits from the prism assembly 11 to the surface of the light valve 13; the light valve 13 modulates the illumination light beam and emits the modulated light beam to the prism assembly 11, and then emits the modulated light beam from the prism assembly 11 to the flat light-transmitting assembly 12, and the flat light-transmitting assembly 12 vibrates to realize the dislocation of the modulated light beam at two adjacent moments, and then the modulated light beams at two adjacent moments sequentially emit to the lens 2.

In order to reduce the back focus of the lens 2 in the related art, if the thickness of the prism assembly 11 is reduced, the prism assembly 11 will form a convex angle 1113, and under the influence of the convex angle 1113, the flat-plate light-transmitting assembly 12 cannot effectively move toward the direction close to the prism assembly 11 due to the large size of the flat-plate light-transmitting assembly, so that the back focus of the lens 2 in the related art cannot be effectively reduced.

Illustratively, taking the prism assembly 11 as a TIR (Total Internal Reflection) prism as an example, as shown in fig. 3, the TIR prism 111 includes a first prism 1111 and a second prism 1112, a first side surface of the first prism 1111 is attached to a first side surface of the second prism 1112, the illumination light beam enters along the second side surface of the first prism 1111 and exits to the surface of the light valve 13 along the third side surface of the first prism 1111, and the modulated light beam modulated by the light valve 13 enters the first prism 1111 and exits to the flat-sheet light-transmitting assembly 12 along the second side surface of the second prism 1112. To ensure that the illumination beam is incident entirely along the second side of the first prism 1111, the thickness of the first prism 1111 is difficult to reduce, and 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 shown in fig. 3, the corner of the first prism 1111 protrudes to form a convex angle 1113, which affects the movement of the flat-sheet light-transmitting member 12 toward the TIR prism 111.

In the embodiment of the present application, after the illumination light beam in the optical-mechanical system 1 is modulated by the light valve 13 to obtain the modulated light beam, the modulated light beam firstly enters the flat light-transmitting assembly 12, then exits from the flat light-transmitting assembly 12 to the prism assembly 11, and further exits from the prism assembly 11 to the lens 2, at this time, after the thickness of the prism assembly 11 is reduced, as shown in fig. 4, taking the prism assembly 11 as the TIR prism 111 as an example, the incident light side of the lens 2 can approach the TIR prism 111 to the greatest extent without being affected by the convex angle 1113 formed on the TIR prism 111, so as to reduce the back focal length of the lens 2; after the back focal length of the lens 2 is reduced, the irradiation area of the modulated light beam emitted from the TIR prism 111 on the lens 2 will be reduced, that is, the irradiation area of the modulated light beam emitted from the TIR prism 111 on the lens 2 included in the lens 2 will be reduced, so that the size of the lens can be reduced appropriately to reduce the difficulty in designing the lens 2.

Optionally, the projection of the light-entering side of the lens 2 on the prism assembly 11 is located in the area of the first light-exiting side of the prism assembly 11. The first light exit side refers to the side of the prism assembly 11 that exits the modulated light beam.

Taking the prism assembly 11 as the TIR prism 111 as an example, the first light exiting side of the prism assembly 11 refers to the second side surface of the second prism 1112, and at this time, the projection of the light entering side of the lens 2 on the prism assembly 11 is located in the area where the second side surface of the second prism 1112 is located.

In this way, when the incident light side of the lens 2 moves toward the prism assembly 11, the influence of the convex 1113 formed by the TIR prism 111 can be completely avoided, so that the lens 2 further approaches the TIR prism 111 to further reduce the back focus of the lens 2.

In addition, the main optical axis of the lens 2 is perpendicular to the plane of the first light-emitting side of the prism assembly 11. Therefore, when the light incident side of the lens 2 approaches the prism assembly 11, the interference between the edge of the prism assembly 11 and the edge of the light incident side of the lens 2, which may occur, is avoided, so that the approach of the lens 2 to the prism assembly 11 can be better ensured.

In the embodiment of the present application, a red, green, and blue three-primary-color solid-state laser is used as the Light source system, or a solid-state laser excites a fluorescent substance to be used as the Light source system, or a solid-state laser is used in combination with an LED (Light-Emitting Diode) Light source to be used as the Light source system.

The fluorescent substance refers to a device capable of converting a monochromatic light beam into a tricolor light beam, and is illustratively a fluorescent wheel with phosphor powder.

In the embodiment of the present application, the optical-mechanical system 1 further includes a light pipe, a reflector, and a lens assembly disposed along the propagation direction of the illumination beam; the illumination beam passes through the light guide and enters the lens assembly, and is reflected to the prism assembly 11 under the action of the reflector after being transmitted by the lens assembly. The light guide pipe is used for carrying out dodging treatment on the illumination light beams, so that light spots formed after the illumination light beams are emitted have a certain shape.

In addition to the light guide for homogenizing the illumination light beam, a fly eye lens may also be used for homogenizing the illumination light beam, which is not limited in the embodiment of the present application. The lens assembly includes the lens structure and the number of lenses, which are not limited in the embodiments of the present application, in reference to the related art.

As shown in fig. 5, the opto-mechanical system 1 includes an opto-mechanical housing 14, and the prism assembly 11, the flat plate light-transmitting assembly 12 and the light valve 13 are fixed in the opto-mechanical housing 14.

In the related art, as shown in fig. 6, since the flat light-transmitting component 12 is located between the prism component 11 and the lens 2, the flat light-transmitting component 12 is far away from the inner wall of the optical housing 14, and at this time, an installation bracket is required as a medium to implement installation of the flat light-transmitting component 12. The use of the mounting bracket will undoubtedly increase the distance between the prism assembly 11 and the lens 2, thereby increasing the back focal length of the lens 2. For example, taking the prism assembly 11 as the TIR prism 111 as an example, when the flat-plate light-transmitting assembly 12 is mounted by the mounting bracket, a distance of 11.3 mm needs to be reserved between the TIR prism 111 and the lens 2.

In the embodiment of the present application, because the flat-sheet light-transmitting component 12 is located between the light valve 13 and the prism component 11, and for the light valve 13, a through hole is usually formed in the optical machine housing 14, and then the light valve 13 is embedded in the area where the through hole is located and is fixed with the optical machine housing 14, at this time, as shown in fig. 5, the flat-sheet light-transmitting component 12 can be directly attached to the inner wall of the optical machine housing 14 for fixation, thereby avoiding the use of a mounting bracket, further reducing the distance between the surface of the light valve 13 and the incident light side of the lens 2, and further reducing the back focal length of the lens 2. For example, taking the prism assembly 11 as the TIR prism 111 as an example, when the flat-plate light-transmitting assembly 12 is directly fixed on the inner wall of the optical housing 14, a 6.6 mm distance needs to be reserved between the light valve 13 and the prism assembly 11.

In this way, with reference to fig. 7 and fig. 8, the irradiation area of the illumination light beam emitted from the TIR prism 111 on the lens 2 in the embodiment of the present application is reduced, so that the size of the lens included in the lens 2 can be reduced, and the difficulty in designing the lens 2 is reduced.

In the embodiment of the present application, the optical-mechanical system 1 includes a control component, the flat-sheet light-transmitting component 12 includes a support and a flat-sheet light-transmitting mirror, the support is fixed in the optical-mechanical housing 14, the flat-sheet light-transmitting mirror is fixed on the support, and the control component is used for controlling the vibration of the support, so as to drive the vibration of the flat-sheet light-transmitting mirror, and further to emit modulated light beams with dislocation at adjacent time.

The structure of the bracket can refer to the related art, and the embodiment of the application is not limited thereto. The flat light-transmitting mirror can be made of a material with high light transmittance, so that when the illumination light beam emitted by the prism component 11 is emitted to the surface of the light valve 13 through the flat light-transmitting component 12, the loss of the illumination light beam is reduced.

Optionally, the thickness of the flat-plate transparent mirror is 2 millimeters, and of course, the thickness of the flat-plate transparent mirror may also be other values, which is not limited in this application embodiment.

And in the vibration process of the bracket, the bracket is continuously switched between the first position and the second position so as to realize the continuous switching of the flat-sheet light-transmitting mirror between the first position and the second position. When the flat piece light-transmitting mirror is switched from the first position to the second position, or is switched from the second position to the first position, the corresponding time when the flat piece light-transmitting mirror is in the first position and the corresponding time when the flat piece light-transmitting mirror is in the second position are respectively the first time and the second time.

Optionally, the first position is an initial position where the bracket is not vibrated, and the second position is a vibration position where the bracket is vibrated; or the first position and the second position are vibration positions where the support is vibrated, and the first position and the second position are vibration positions corresponding to the support after the support vibrates along different directions.

In some embodiments, the flat sheet light-transmitting member 12 vibrates in a first direction parallel to the long side of the rectangular image formed by the lens 2 and in a second direction parallel to the short side of the rectangular image formed by the lens 2.

Optionally, the vibration of the flat light-transmitting component 12 in the first direction and the vibration of the flat light-transmitting component 12 in the second direction are generated synchronously, where the flat light-transmitting component 12 is located at the first position after being reset together in the first direction and the second direction, and the flat light-transmitting component 12 is located at the second position after being vibrated together in the first direction and the second direction; or the vibration of the flat light-transmitting component 12 in the first direction and the vibration in the second direction occur asynchronously, at this time, the flat light-transmitting component 12 is located at the first position after vibrating in the first direction and after resetting in the second direction, and the flat light-transmitting component 12 is located at the second position after resetting in the first direction and after vibrating in the second direction.

In other embodiments, the flat sheet light-transmitting member 12 vibrates in a third direction, which is a direction parallel to a diagonal line of the rectangular image formed by the lens 2. At this time, the flat light-transmitting component 12 is located at the first position after being reset in the third direction, and the flat light-transmitting component 12 is located at the second position after being vibrated in the third direction.

In the embodiment of the present application, the prism assembly 11 is 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. Illustratively, 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 a RTIR (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. Illustratively, the distance between the surface of the light valve 13 and the RTIR prism 112 is 9.5 mm.

In addition, when the prism assembly 11 is the RTIR prism 112, the flat-plate light-transmitting assembly 12 is disposed between the light valve 13 and the RTIR prism 112, which can also avoid the interference of the circuit board in the optical housing 14, thereby facilitating the fixed installation of the flat-plate light-transmitting assembly 12 in the optical housing 14.

As described in the foregoing embodiment, as shown in fig. 4, the TIR prism 111 is configured such that the illumination beam enters along the second side of the first prism 1111, is totally reflected at the joint surface of the first prism 1111 and the second prism 1112, and then exits to the flat-sheet light-transmitting component 12 along the third side of the first prism 1111, and the modulated beam having a misalignment at an adjacent time exiting through the flat-sheet light-transmitting component 12 enters the first prism 1111 along the third side of the first prism 1111, and exits to the lens 2 along the second side of the second prism 1112 after transmitting through the joint surface of the first prism 1111 and the second prism 1112.

Optionally, the third side of the first prism 1111 is parallel to the second side of the second prism 1112, so as to ensure that the surface of the light valve 13 is parallel to the plane where the light incident side of the lens 2 is located.

The structure of the RTIR prism 112 can refer to the related art, which is not limited in the embodiments of the present application. Illustratively, as shown in fig. 9, the RTIR prism 112 includes a third prism 1121, a flat glass 1123, and a fourth prism 1122, and a first side of the fourth prism 1122 is a curved surface and fixed with a light reflecting material; two sides of the planar glass 1123 are respectively attached to the first side surface of the third prism 1121 and the second side surface of the fourth prism 1122, the illumination light beam enters the fourth prism 1122 along the third side surface of the fourth prism 1122, is totally reflected to the first side surface of the fourth prism 1122 at the attachment surface of the planar glass 1123 and the fourth prism 1122, is totally reflected to the planar glass 1123 under the action of the reflective material, is refracted to the third prism 1121 at the attachment surface of the planar glass 1123 and the third prism 1121, and then exits to the flat light-transmitting assembly 12 along the second side surface of the third prism 1121; the modulated light beams emitted from the flat light-transmitting component 12 at adjacent moments and having dislocation are incident on the third prism 1121 through the second side surface of the third prism 1121, and are totally reflected at the joint surface of the third prism 1121 and the plane glass 1123 and then emitted to the lens 2 along the third side surface of the third prism 1121.

Alternatively, the second side of the third prism 1121 is perpendicular to the third side, so that the distance of the modulated light beam from the surface of the light valve 13 to the lens 2 can be reduced.

In the embodiment of the present application, 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 main optical axis of the lens 2 is perpendicular to the plane where the second light emergent 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 emergent side of the prism assembly 11 is located, so as to better ensure that the lens 2 is close to the prism assembly 11.

In the embodiment of the present application, the flat light-transmitting component 12 and the prism component 11 can be fixed in the optical engine housing 14 separately, or can be fixed in the optical engine housing 14 as a whole. The fixing manner of the RTIR prism 112 is similar to that of the TIR prism 111, and the fixing of the TIR prism 111 will be described by taking the prism assembly 11 as the TIR prism 111 as an example.

In the first case, as shown in FIG. 10, the flat sheet light transmissive member 12 and the TIR prism 111 are separately secured within the opto-mechanical housing 14. At this time, for the flat light-transmitting member 12, the flat light-transmitting member 12 may be directly fixed to the inner wall of the optical housing 14 through a bracket included in the flat light-transmitting member 12, so as to directly fix the flat light-transmitting member 12.

For the TIR prism 111, because the flat light-transmitting component 12 is spaced between the TIR prism 111 and the inner wall of the optical engine housing 14, a positioning column protrudes from the inner wall of the optical engine housing 14, and the TIR prism 111 is fixed on the positioning column, so as to realize direct fixation with the optical engine housing 14.

And part of the positioning columns can form bearing columns, and part of the positioning columns can form fixing columns, so that the TIR prism 111 is supported on the bearing columns, and is pressed on the TIR cold frame through a fixing piece and fixed on the fixing columns, and the fixing of the TIR prism 111 is realized.

In combination with the above explanation of the TIR prism 111, at this time, the first prism 1111 is supported on the supporting column, and the fixing member is pressed against the first prism 1111 and is fixedly connected to the fixing column, so as to fixedly connect the TIR prism 111 and the optical engine housing 14.

Of course, if the TIR prism 111 is directly and fixedly connected to the positioning post, the projection of the TIR prism 111 on the inner wall of the optical engine housing 14 needs to cover the projection of the flat light-transmitting component 12 on the inner wall of the optical engine housing 14. The cross-sectional area of the TIR prism 111 is thus too large, which makes the cost of the TIR prism 111 too high. Therefore, as shown in fig. 10, the opto-mechanical system 1 further includes a prism holder 15, the TIR prism 111 is fixed on the prism holder 15, and the prism holder 15 is fixed in the opto-mechanical housing 14.

Optionally, the prism support 15 is a fixing clip, and the TIR prism 111 is clamped on the fixing clip, so that the fixing clip is fixed on the positioning column protruding from the inner wall of the optical engine housing 14, so as to fix the TIR prism 111 and the optical engine housing 14, and reduce the cost of the TIR prism 111.

Alternatively, as shown in fig. 10 or 11, the prism holder 15 includes a holder body 151 and a stopper 152; the holder body 151 has a limiting mechanism and a light hole 1511, the holder body 151 is fixed on the optical machine housing 14, the limiting member 152 is fixed on the holder body 151, the limiting member 152 is used for matching the limiting mechanism to limit the TIR prism 111 on the holder body 151, and the first light emitting side of the TIR prism 111 faces the light hole 1511.

Because the holder body 151 has the light transmission hole 1511, the illumination beam can pass through the light transmission hole 1511 after passing through the TIR prism 111, and is emitted to the light valve 13 after passing through the flat light transmission component 12, and then the modulated beam after vibration processing of the flat light transmission component 12 is emitted to the TIR prism 111 through the light transmission hole 1511. In addition, in combination with the above explanation of the TIR prism 111, at this time, the first prism 1111 is limited by the limiting mechanism, and the first prism 1111 or the second prism 1112 is pressed by the limiting member 152, so that the TIR prism 111 is fixed on the bracket body 151.

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

Wherein, the size of spacing groove can be set up according to the area of the first light-emitting side of TIR prism 111 to avoid TIR prism 111 to appear the condition of rocking behind the spacing inslot in the first light-emitting side of TIR prism 111.

In other embodiments, the limiting mechanism includes a first bearing structure 1512, that is, as shown in fig. 11 or fig. 12, the holder body 151 has the first bearing structure 1512, and the first light incident side of the TIR prism 111 bears against the first bearing structure 1512. In this way, the first bearing structure 1512 limits the first light incident side of the TIR prism 111, so as to prevent the TIR prism 111 from moving in a direction perpendicular to the first light incident side.

Wherein, in order to avoid the first bearing structure 1512 blocking the illumination light beam incident on the prism assembly 11, the first bearing structure 1512 comprises at least two collinear blocking blocks. Illustratively, the first bearing structure 1512 includes two blocking blocks, and the two blocking blocks respectively block the ends at the first light incident side.

Further, the limiting mechanism further includes a second bearing structure 1513, that is, as shown in fig. 11 or fig. 12, the holder body 151 has a second bearing structure 1513, and at this time, the first side of the TIR prism 111 bears against the second bearing structure 1513, and the first side is adjacent to the first light incident side.

The specific structure of the second bearing structure 1513 may refer to the first bearing structure 1512, which is not described in detail in this embodiment of the application. In conjunction with 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 TIR prism 111 can be limited in the X and Y directions by the first bearing structure 1512 and the second bearing structure 1513, and then the TIR prism 111 is limited in the Z direction by the limiting member 152, so as to ensure the stability of fixing the TIR prism 111.

Optionally, for the two structures of the limiting mechanism, the limiting member 152 is a pressing elastic sheet, and the pressing elastic sheet presses the TIR prism 111. The pressing elastic sheet is pressed on the first prism 1111 or the second prism 1112 included in the TIR prism 111 to realize the fixed connection between the TIR prism 111 and the holder body 151, which is not limited in the embodiment of the present application.

Of course, the limiting member 152 may be other structures besides the pressing elastic sheet as long as it can press the TIR prism 111, and this embodiment of the present application does not limit this.

In still other embodiments, the stop mechanism includes a second bearing structure 1513, the first side of the TIR prism 111 bearing against the second bearing structure 1513; the limiting member 152 is an adjusting screw, the bracket body 151 further has a protrusion, the adjusting screw passes through the protrusion and is in threaded connection with the protrusion, one end of the adjusting screw abuts against the second side of the TIR prism 111, and the first side is opposite to the second side.

Wherein, in connection with the above explanation of the TIR prism 111, the two bottom surfaces of the first prism 1111 are respectively the first side and the second side of the TIR prism 111. In this way, the first side of the TIR prism 111 can be limited by the second bearing structure 1513, and then the adjusting screw abuts against the second side of the TIR prism 111, so as to clamp the TIR prism 111 between the second bearing structure 1513 and the adjusting screw, thereby ensuring the stability of fixing the TIR prism 111.

It should be noted that the TIR prism 111 is directly supported on the holder body 151, or as shown in fig. 12, the holder body 151 has at least three support points 1514, and is not collinear, and the TIR prism 111 is supported on the at least three support points 1514. In this way, the contact area between the TIR prism 111 and the holder body 151 is reduced by the at least three support points 1514, so that the processing difficulty can be reduced, and the flatness of the surface where the at least three support points 1514 are located is further ensured. Illustratively, the number of support points 1514 is four, with four support points 1514 enclosing a rectangle.

Next, the fixing of the flat sheet light-transmitting member 12 and the TIR prism 111 will be exemplified in conjunction with the above description. As shown in fig. 10, the flat light-transmitting component 12 is directly fixed in the optical engine housing 14, the TIR prism 111 is supported by the first supporting structure 1512 and the second supporting structure 1513, and is fixed on the bracket body 151 by pressing two pressing resilient pieces, and the bracket body 151 is fixed in the optical engine housing 14.

In the second case, the flat sheet light transmissive member 12 and the TIR prism 111 are fixed as a unit within the opto-mechanical housing 14. At this time, as shown in fig. 13, the opto-mechanical system 1 further includes a fixing bracket 16, the flat light-transmitting component 12 and the TIR prism 111 are fixed on the fixing bracket 16, and the fixing bracket 16 is fixed in the opto-mechanical housing 14.

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

Here, the light transmission hole 1511 of the fixing bracket 16 may refer to the above-described function of the light transmission hole 1511 of the bracket body 151. In addition, in order to secure the distance between the flat sheet light-transmitting member 12 and the TIR prism 111 to be 1 mm and, at the same time, secure the strength of the fixing bracket 16, the first side or the second side of the fixing bracket 16 has a groove. When the first side of the fixed support 16 is provided with a groove, the flat-sheet light-transmitting component 12 is limited in the groove; when the second side of the fixed support 16 has a groove, the TIR prism 111 is trapped in the groove.

In order to ensure that the flat sheet light-transmitting assemblies 12 with different sizes can be fixed on the fixing support 16, optionally, the fixing support 16 is provided with a plurality of oblong holes, and each oblong hole is internally provided with a fixing bolt; the fixing bolts can slide in the corresponding oblong holes and are used for being fixedly connected with the flat sheet light-transmitting component 12. Like this, because fixing bolt's slidable to the plain film printing opacity subassembly 12 of different sizes, only need slide fixing bolt to suitable position in the slotted hole, can realize fixing bolt and plain film printing opacity subassembly 12's fixed connection, thereby realize fixing plain film printing opacity subassembly 12 on fixed bolster 16, avoided the problem of redesign fixed bolster 16 to the plain film printing opacity subassembly 12 of different sizes.

The fixing manner of the TIR prism 111 on the second side of the fixing bracket 16 can refer to the above-described manner of fixing the TIR prism 111 on the bracket body 151, and details of this embodiment are not repeated herein. Illustratively, the second side of the fixed bracket 16 has a first bearing structure and a second bearing structure, and the TIR prism 111 bears against the first bearing structure and the second bearing structure and is fixed to the second side of the fixed bracket 16 by pressing the elastic sheet.

In the embodiment of the application, the illuminating beam of light source system outgoing is through the plain film printing opacity subassembly after the light valve modulation earlier, and through prism subassembly outgoing to camera lens again, combines the fixed mode of light valve like this, and the inner wall that plain film printing opacity subassembly can laminate ray apparatus casing is fixed to avoided the use of installing support, and then avoided the back focal length of installing support self thickness increase camera lens, also be the back focal length that has shortened the camera lens. Therefore, the irradiation area of the modulation light beam emitted by the prism assembly on the lens is reduced, namely the irradiation area of the modulation light beam emitted by the prism assembly on the lens including the lens is reduced, so that the size of the lens can be reduced, and the design difficulty of the lens is reduced.

The above description is only illustrative of the embodiments of the present application and is not intended to limit the embodiments of the present application, and any modification, equivalent replacement, or improvement made within the spirit and principle of the embodiments of the present application should be included in the scope of the embodiments of the present application.

Claims

1. A projection imaging system, comprising:

a light source system, an optical-mechanical system and a lens;

the light source system is used for providing an illumination light beam for the optical-mechanical system, and the optical-mechanical system is used for modulating the illumination light beam and emitting the modulated light beam obtained after modulation to the lens for imaging;

2. The projection imaging system of claim 1, wherein the flat sheet light transmissive member vibrates in a first direction parallel to a long side of the rectangular image formed by the lens and in a second direction parallel to a short side of the rectangular image formed by the lens.

3. The projection imaging system of claim 1 wherein the flat sheet light transmissive element vibrates in a third direction parallel to a diagonal of the rectangular image formed by the lens.

4. The projection imaging system of any of claims 1-3 wherein the flat sheet light transmissive assembly comprises a flat sheet light transmissive mirror having a thickness of 2 millimeters.

5. The projection imaging system of claim 1 wherein the prism assembly is an RTIR prism and the distance between the surface of the light valve and the RTIR prism is less than or equal to 11 millimeters.

6. The projection imaging system of claim 5, wherein the distance between the surface of the light valve and the RTIR prism is 9.5 millimeters.

7. The projection imaging system of claim 1 wherein the prism assembly is a TIR prism and the distance between the surface of the light valve and the TIR prism is less than or equal to 8 millimeters.

8. The projection imaging system of claim 7 wherein the distance between the surface of the light valve and the TIR prism is 6.6 millimeters.

9. The projection imaging system of claim 1, wherein the projection of the light-in side of the lens onto the prism assembly is located in an area of a first light-out side of the prism assembly, the first light-out side being a side of the prism assembly from which the modulated light beam exits.

10. The projection imaging system of claim 9 wherein a primary optical axis of the lens is perpendicular to a plane in which the first light exit side of the prism assembly lies.