Projection ray machine

Abstract

The utility model discloses a projection light machine, which comprises a spatial light modulator, a projection lens, a prism fixing cavity and a prism assembly fixed in the prism fixing cavity, and is characterized in that the direction in which image light is emitted from the spatial light modulator and then passes through the prism assembly to enter the projection lens is defined as a first direction; the prism assembly comprises a top surface, a bottom surface, a first side surface and a second side surface, the first side surface is perpendicular to the first direction, and the top surface and the bottom surface are arranged in the second direction; the second direction is perpendicular to the first direction; a bearing surface attached to the prism assembly is arranged in the prism fixing cavity; the prism fixing cavity is glued with at least partial area of the second side surface; the first limiting piece abuts against the first side face and is used for pressing the prism assembly into the prism fixing cavity in the first direction. The second limiting piece abuts against the top face and is used for pressing the prism assembly into the prism fixing cavity in the second direction. According to the invention, the prism assembly can be reliably installed in the prism fixing cavity, so that the reliability and stability of the projection ray machine are improved.

Description

Technical Field

[0001] The present application relates to the field of display, and in particular to a projection optical machine. Background Art

[0002] As cars become more intelligent, in-vehicle projection equipment is increasingly used in cars, including window projection display systems and head-up display systems (HUD).

[0003] The projection optical machine is the core component of the vehicle display system. The projection optical machine usually includes a DMD (digital micromirror device), a prism assembly, and a projection lens. The light emitted by the DMD is guided to the prism assembly, and the prism assembly receives the light and emits it to the projection lens. In the prior art, the prism assembly in the projection optical machine is usually set in two pieces. After the two prisms are glued together, they are pressed tightly inside the optical machine housing by an elastic member.

[0004] However, the in-vehicle environment has high requirements for the stability and reliability of the projection optical machine. When the vehicle is bumpy, the existing prism fixing method cannot reliably install the prism on the optical machine housing, resulting in poor reliability and stability of the projection optical machine, which cannot meet the use requirements of the in-vehicle environment. Utility Model Content

[0005] The main technical problem solved by the present application is to provide a projection optical machine that can solve the problem of poor reliability and stability of existing projection optical machines.

[0006] In order to solve the above technical problems, the technical solution adopted in the present application is to provide a projection optical machine for modulating incident illumination light into image light and emitting it, including: a spatial light modulator, a projection lens, a prism fixing cavity and a prism assembly fixed in the prism fixing cavity, the spatial light modulator and the projection lens are respectively located on opposite sides of the prism fixing cavity, the illumination light incident on the projection optical machine is guided to the spatial light modulator through the prism assembly to be modulated to form image light, the image light is emitted from the spatial light modulator and then transmits through the prism assembly to enter the projection lens, and is projected to the outside through the projection lens to form a projection image; it is defined that the image light is emitted from the spatial light modulator and then transmits through the prism assembly to enter The direction of the projection lens is a first direction, the prism assembly includes a top surface and a bottom surface that are relatively arranged, and a first side surface and a second side surface that connect the top surface and the bottom surface, the extension direction of the first side surface is perpendicular to the first direction, and the arrangement direction of the top surface and the bottom surface is a second direction; the second direction is perpendicular to the first direction; a bearing surface is arranged in the prism fixing cavity, and the bearing surface is in contact with the bottom surface and the second side surface of the prism assembly; the prism fixing cavity is glued to at least a portion of the second side surface; a first limiting member abuts against the first side surface, and is used to press the prism assembly into the prism fixing cavity along the first direction; a second limiting member abuts against the top surface, and is used to press the prism assembly into the prism fixing cavity along the second direction.

[0007] Among them, at least one groove is arranged between the prism fixing cavity and the second side surface, glue is arranged in the groove, and the prism fixing cavity and the second side surface are glued together by the glue.

[0008] The supporting surface includes a bottom supporting surface and a side supporting surface. The bottom supporting surface is in contact with the bottom surface of the prism assembly, and the side supporting surface is in contact with the second side surface of the prism assembly.

[0009] The prism assembly includes a first prism and a second prism; the first prism includes a first top surface and a first bottom surface which are arranged opposite to each other, and a first sub-side surface, a second sub-side surface and a third sub-side surface which are connected end to end with the first top surface and the first bottom surface; the second prism includes a second top surface and a second bottom surface which are arranged opposite to each other, and a fourth sub-side surface, a fifth sub-side surface and a sixth sub-side surface which are connected end to end with the second top surface and the second top surface; wherein the third sub-side surface of the first prism is glued to the fourth sub-side surface of the second prism to form a prism assembly; the first sub-side surface, the second sub-side surface of the first prism and the fifth sub-side surface of the second prism form the second side surface of the prism assembly; the first sub-side surface and the sixth sub-side surface are arranged opposite to each other, and the sixth sub-side surface of the second prism forms the first side surface of the prism assembly; the first top surface of the first prism and the second top surface of the second prism form the top surface of the prism assembly; the first bottom surface of the first prism and the second bottom surface of the second prism form the bottom surface of the prism assembly.

[0010] Wherein, a groove is formed between the first sub-side surface of the first prism and the prism fixing cavity; and / or, a groove is formed between the second sub-side surface of the first prism and the prism fixing cavity.

[0011] Among them, the first limiting member is a square plate with a hollow area, and the hollow area corresponds to the first side surface of the prism assembly; a plurality of elastic members are arranged on the square plate, and the plurality of elastic members are arranged along a partial edge of the hollow area for abutting against the edge of the first side surface.

[0012] The second limiting member is a pressure pad, and the pressure pad abuts against the second top surface of the second prism.

[0013] The bottom supporting surface includes a first bottom supporting surface and a second bottom supporting surface. The first bottom supporting surface is in contact with the first bottom surface of the first prism, and the second bottom supporting surface is in contact with the second bottom surface of the second prism.

[0014] The side supporting surface includes a first side supporting surface and a second side supporting surface, the first side supporting surface is in contact with the first sub-side surface of the first prism, and the second side supporting surface is in contact with the fifth sub-side surface of the second prism.

[0015] The projection optical machine further comprises a cover plate, which is arranged on a side surface of the second limiting member away from the top surface and is used to cover the top surface of the prism assembly.

[0016] The beneficial effects of the present application are as follows: Different from the prior art, the present application provides a projection optical machine, which accommodates a prism assembly through a prism fixing cavity, and provides a bearing surface on the prism fixing cavity that is in contact with the bottom surface and the second side surface of the prism assembly, so that the prism assembly can be positioned and supported through the bearing surface. Furthermore, by providing a first limiting member that abuts against the first side surface of the prism assembly, the prism assembly can be pressed in the first direction through the bearing surface and the first limiting member. At the same time, by providing a second limiting member that abuts against the top surface of the prism assembly, the prism assembly can be pressed in the second direction through the bearing surface and the second limiting member. Furthermore, by gluing the prism fixing cavity to at least a portion of the second side surface of the prism assembly, the prism assembly can be effectively fixed in the prism fixing cavity. The present application positions and glues the prism assembly through the supporting surface in the prism fixing cavity, and presses the prism assembly in the first direction and the second direction through the first limiting member and the second limiting member, so that the prism assembly can be reliably installed in the prism fixing cavity, thereby improving the reliability and stability of the projection light machine, making the optical path more stable, and then meeting the use requirements of the projection light machine in a vehicle environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 It is a schematic diagram of the assembly structure of the projection optical machine of the present application;

[0019] Figure 2 yes Figure 1 Schematic diagram of the exploded structure of the projection optical machine;

[0020] Figure 3 yes Figure 2 The right side view of the projection optical machine;

[0021] Figure 4 yes Figure 1 Schematic diagram of the installation direction of the middle prism assembly and the optical machine housing;

[0022] Figure 5 yes Figure 1 A schematic diagram of the structure of the middle prism assembly;

[0023] Figure 6 yes Figure 1 A schematic diagram of the structure of the bearing surface in the optical machine housing;

[0024] Figure 7 yes Figure 1 A schematic diagram of the installation direction of the first stopper and the optical machine housing;

[0025] Figure 8 yes Figure 7 A schematic diagram of the structure after the central optical machine housing and the first limiting member are assembled;

[0026] Fig. 9 yes Figure 1 A schematic diagram of the structure of a groove in an optical machine housing;

[0027] Fig.10 yes Figure 1 A schematic diagram of the structure after the central optical machine housing and the second limiting member are assembled;

[0028] Fig.11 yes Figure 1 Schematic diagram of the installation direction of the middle cover and the optical machine housing. DETAILED DESCRIPTION

[0029] 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 making creative work are within the scope of protection of this application.

[0030] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms of "a", "said", and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless otherwise clearly indicated above, and "multiple" generally includes at least two, but does not exclude the inclusion of at least one.

[0031] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0032] It should be understood that the terms "include", "comprises" or any other variations used herein are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, the elements defined by the sentence "includes..." do not exclude the presence of other identical elements in the process, method, article or device that includes the elements.

[0033] In the prior art, the prism assembly in the projector is usually set in two pieces. After the two prisms are glued together, they are pressed tightly inside the projector housing by an elastic member. However, the vehicle-mounted environment has high requirements for the stability and reliability of the projector. In the bumpy state of the vehicle, the existing prism fixing method cannot make the prism reliably installed on the projector housing, resulting in poor reliability and stability of the projector, which cannot meet the use requirements of the vehicle-mounted environment.

[0034] Based on the above situation, the present application provides a projection optical machine that can solve the problem of poor reliability and stability of existing projection optical machines.

[0035] The projection optical machine provided in the present application is used to modulate the incident illumination light into image light and emit it, including: a spatial light modulator, a projection lens, a prism fixing cavity and a prism assembly fixed in the prism fixing cavity, the spatial light modulator and the projection lens are respectively located on opposite sides of the prism fixing cavity, the illumination light incident on the projection optical machine is guided to the spatial light modulator through the prism assembly to be modulated to form image light, the image light is emitted from the spatial light modulator and then transmits through the prism assembly to enter the projection lens, and is projected to the outside through the projection lens to form a projection image; the direction in which the image light is emitted from the spatial light modulator and then transmits through the prism assembly to enter the projection lens is defined as the first direction. In one direction, the prism assembly includes a top surface and a bottom surface that are relatively arranged, and a first side surface and a second side surface that connect the top surface and the bottom surface, the extension direction of the first side surface is perpendicular to the first direction, and the arrangement direction of the top surface and the bottom surface is the second direction; the second direction is perpendicular to the first direction; a bearing surface is arranged in the prism fixing cavity, and the bearing surface is in contact with the bottom surface and the second side surface of the prism assembly; the prism fixing cavity is glued to at least a part of the second side surface; a first stopper abuts against the first side surface, and is used to press the prism assembly into the prism fixing cavity along the first direction; a second stopper abuts against the top surface, and is used to press the prism assembly into the prism fixing cavity along the second direction. The present application positions and glues the prism assembly through the bearing surface in the prism fixing cavity, and presses the prism assembly in the first direction and the second direction through the first stopper and the second stopper, so that the prism assembly can be reliably installed in the prism fixing cavity, thereby improving the reliability and stability of the projection optical machine, making the optical path more stable, and then meeting the use requirements of the projection optical machine in a vehicle-mounted environment.

[0036] To illustrate the specific structure of the projection optical machine of this application, please refer to Figure 1 , Figure 2 , Figure 3 and Figure 4 , Figure 1 It is a schematic diagram of the assembly structure of the projection optical machine of this application, Figure 2 yes Figure 1 Schematic diagram of the explosion structure of the projection optical machine. Figure 3 yes Figure 2 The right side view of the projection optical machine. Figure 4 yes Figure 1 Schematic diagram of the installation direction of the middle prism assembly and the optical machine housing.

[0037] In this embodiment, the projection light machine 100 is used to modulate the incident illumination light into image light and emit it. The projection light machine 100 includes a spatial light modulator 30, a projection lens 20, a prism fixing cavity, and a prism assembly 40 fixed in the prism fixing cavity. The spatial light modulator 30 and the projection lens 20 are respectively located on opposite sides of the prism fixing cavity. The illumination light incident on the projection light machine 100 is guided to the spatial light modulator 30 through the prism assembly 40 for modulation to form image light. After the image light is emitted from the spatial light modulator 30, it is transmitted through the prism assembly 40 and enters the projection lens 20, and is projected to the outside through the projection lens 20 to form a projection image. The direction in which the image light is emitted from the spatial light modulator 30 and then transmitted through the prism assembly 40 to enter the projection lens 20 is defined as a first direction. The prism assembly 40 includes a top surface 41 and a bottom surface 42 that are arranged opposite to each other, and a first side surface 43 and a second side surface 44 that connect the top surface 41 and the bottom surface 42. The extension direction of the first side surface 43 is perpendicular to the first direction x, and the arrangement direction of the top surface 41 and the bottom surface 42 is the second direction y, and the second direction y is perpendicular to the first direction x. A bearing surface is provided in the prism fixing cavity, and the bearing surface is in contact with the bottom surface 42 and the second side surface 43 of the prism assembly 40. The prism fixing cavity is glued to at least a portion of the second side surface 43. The first stopper 51 abuts against the first side surface 43, and is used to press the prism assembly 40 into the prism fixing cavity along the first direction x. The second stopper 52 abuts against the top surface 41, and is used to press the prism assembly 40 into the prism fixing cavity along the second direction y.

[0038] In this embodiment, the spatial light modulator 30 is a digital micromirror device.

[0039] In this embodiment, the projection optical engine 100 includes an optical engine housing 10 , and the prism fixing cavity is disposed inside the optical engine housing 10 .

[0040] The optical machine housing 10 includes a top wall 11 and a bottom wall 12 that are oppositely disposed, and a side wall 13 connecting the top wall and the bottom wall. The top wall 11, the bottom wall 12 and the side wall 13 together form a prism fixing cavity.

[0041] The top wall 11 of the optical machine housing 10 corresponds to the top surface 41 of the prism assembly 40 , the bottom wall 12 corresponds to the bottom surface 42 , and the arrangement direction of the top wall 11 and the bottom wall 12 is the second direction y.

[0042] The top wall 11 and the bottom wall 12 of the optical machine housing 10 are both provided with openings, and the side walls 13 are both provided with openings on both sides corresponding to the projection lens 20 and the spatial light modulator 30 .

[0043] A supporting surface is disposed at the opening of the bottom wall 12 , and a supporting surface is disposed in a partial area of ​​the side wall 13 , so that the supporting surface fits with the bottom surface 42 and the second side surface 44 of the prism assembly 40 .

[0044] In this embodiment, the prism assembly 40 is a TIR (Total Internal Reflection) prism and includes a first prism and a second prism that are glued together, and the connection surface between the first prism and the second prism is a glued surface 45 of the prism assembly 40 .

[0045] In this embodiment, the prism assembly 40 is placed into the prism fixing cavity from the opening corresponding to the top wall 11 of the optical machine housing 10 along the second direction y.

[0046] In this embodiment, the first side surface 43 of the prism assembly 40 is disposed close to the projection lens 20 , and the first stopper 51 is installed on a side of the side wall 13 corresponding to the projection lens 20 to abut against the first side surface 43 .

[0047] In some embodiments, an illumination light source is disposed in the optical machine housing 10, and the illumination light source is disposed on one side of the prism fixing cavity, and is used to emit illumination light along a third direction z to a second side surface 44 of the prism assembly 40 opposite to the illumination light source. The third direction z is perpendicular to the first direction x and the second direction y.

[0048] Specifically, the incident angle of the illumination light incident from the second side surface 44 on the gluing surface 45 is greater than the critical angle of total reflection, so that the gluing surface 45 totally reflects the illumination light to the second side surface 44 opposite to the first side surface 43, and guides the illumination light to the spatial light modulator 30 through the second side surface 44 opposite to the first side surface 43, so that the illumination light is processed into image light through the spatial light modulator 30. The second side surface 44 opposite to the first side surface 43 is further used to guide the image light emitted from the spatial light modulator 30 to the gluing surface 45, so that the image light is emitted to the projection lens 20 through the gluing surface 45.

[0049] In this embodiment, the optical projection machine 100 further includes a cover plate 60 . The cover plate 60 is disposed on a side surface of the second stopper 52 away from the top surface 41 , and is used to cover the top surface 41 of the prism assembly 40 .

[0050] In some implementations, the cover plate 60 is also used to cover most of the top wall 11 of the optical machine housing 10 .

[0051] It can be understood that the prism assembly 40 is accommodated in the prism fixing cavity inside the optical machine housing 10, and a bearing surface that is in contact with the bottom surface 42 and the second side surface 44 of the prism assembly 40 is provided on the prism fixing cavity, so that the prism assembly 40 can be positioned and supported by the bearing surface. Further, by providing a first stopper 51 to abut against the first side surface 43 of the prism assembly 40, the prism assembly 40 can be pressed in the first direction x by the bearing surface and the first stopper 51. At the same time, by providing a second stopper 52 to abut against the top surface 41 of the prism assembly 40, the prism assembly 40 can be pressed in the second direction y by the bearing surface and the second stopper 52. Further, by gluing the prism fixing cavity to at least a portion of the second side surface 44 of the prism assembly 40, the prism assembly 40 can be effectively fixed in the prism fixing cavity.

[0052] In the prior art, the prism assembly cannot be reliably installed on the optical machine housing in a vehicle environment, which may result in a large air gap on the gluing surface of the prism assembly, or cause the gluing surface to be misaligned. When the illumination light is irradiated to the gluing surface, the large air gap and / or misalignment is very likely to cause the illumination light to be misaligned and affect the total reflection of the light, thereby causing the optical path to be unstable, thereby affecting the projection effect.

[0053] Different from the prior art, this embodiment presses the prism assembly 40 into the prism fixing cavity of the optical machine housing 10 through the first limit member 51 and the second limit member 52, so that the prism assembly 40 can be reliably installed on the optical machine housing 10 in a vehicle environment, thereby avoiding the appearance of a large air gap on the gluing surface 45 of the prism assembly 40, thereby improving the stability of the optical path and further improving the projection effect.

[0054] Please refer to Figure 5 , Figure 5 yes Figure 1 Schematic diagram of the structure of the middle prism assembly.

[0055] In this embodiment, the prism assembly 40 includes a first prism 401 and a second prism 402. The first prism 401 includes a first top surface 4011 and a first bottom surface 4012 that are arranged opposite to each other, and a first sub-side surface 4013, a second sub-side surface 4014, and a third sub-side surface 4015 that connect the first top surface 4011 and the first bottom surface 4012 end to end. The second prism 402 includes a second top surface 4021 and a second bottom surface 4022 that are arranged opposite to each other, and a fourth sub-side surface 4023, a fifth sub-side surface 4024, and a sixth sub-side surface 4025 that connect the second top surface 4021 and the second bottom surface 4022 end to end.

[0056] The third sub-side surface 4015 of the first prism 401 and the fourth sub-side surface 4023 of the second prism 402 are glued together to form a glued surface 45 of the prism assembly 40. The first sub-side surface 4013, the second sub-side surface 4014 of the first prism 401 and the fifth sub-side surface 4024 of the second prism 402 form a second side surface 44 of the prism assembly 40. The first sub-side surface 4013 and the sixth sub-side surface 4025 are arranged opposite to each other, and the sixth sub-side surface 4025 of the second prism 402 forms a first side surface 43 of the prism assembly 40. The first top surface 4011 of the first prism 401 and the second top surface 4021 of the second prism 402 form a top surface 41 of the prism assembly 40, and the first bottom surface 4012 of the first prism 401 and the second bottom surface 4022 of the second prism 402 form a bottom surface 42 of the prism assembly 40.

[0057] The first prism 401 and the second prism 402 are both triangular prisms.

[0058] Specifically, the illumination light source is used to emit illumination light along the third direction z to the second sub-side surface 4014 of the first prism 401. The incident angle of the illumination light incident from the second sub-side surface 4014 on the bonding surface 45 is greater than the critical angle of total reflection, so that the bonding surface 45 totally reflects the illumination light to the first sub-side surface 4013 of the first prism 401, and guides the illumination light to the spatial light modulator 30 through the first sub-side surface 4013, so that the illumination light is processed into image light through the spatial light modulator 30. The first sub-side surface 4013 is further used to guide the image light emitted by the spatial light modulator 30 to the bonding surface 45, so that the image light is emitted to the projection lens 20 through the bonding surface 45.

[0059] It can be understood that since the prism assembly 40 can be stably installed on the optical machine housing 10, the bonding surface 45 formed by gluing the first prism 401 and the second prism 402 has a smaller air gap, thereby making the optical path more stable, thereby ensuring the projection effect of the projection optical machine 100.

[0060] Please refer to Figure 6 , Figure 6 yes Figure 1 Schematic diagram of the structure of the bearing surface in the optical machine housing.

[0061] In this embodiment, the bearing surface includes a bottom bearing surface 101 and a side bearing surface 102, the bottom bearing surface 101 is in contact with the bottom surface 42 of the prism assembly 40, and the side bearing surface 102 is in contact with the second side surface 44 of the prism assembly 40. The bottom bearing surface 101 is disposed in the opening of the bottom wall 12, and the side bearing surface 102 is disposed in a partial area of ​​the side wall 13.

[0062] In some embodiments, the bottom supporting surface 101 includes a first bottom supporting surface 1011 and a second bottom supporting surface 1012 . The first bottom supporting surface 1011 is in contact with the first bottom surface 4012 of the first prism 401 , and the second bottom supporting surface 1012 is in contact with the second bottom surface 4022 of the second prism 402 .

[0063] In some other embodiments, the bottom supporting surface 101 may be an integrally formed supporting surface so as to fit with the first bottom surface 4012 of the first prism 401 and the second bottom surface 4022 of the second prism 402 at the same time, which is not limited in the present application.

[0064] It can be understood that by fitting the bottom supporting surface 101 to the bottom surface 42 of the prism assembly 40 , a supporting force opposite to the installation direction of the prism assembly 40 can be provided to position the prism assembly 40 in the second direction y.

[0065] In some embodiments, the side supporting surface 102 includes a first side supporting surface 1021 and a second side supporting surface 1022 , the first side supporting surface 1021 is in contact with the first sub-side surface 4013 of the first prism 401 , and the second side supporting surface 1022 is in contact with the fifth sub-side surface 4024 of the second prism 402 .

[0066] Among them, due to the first sub-side surface 4013 of the first prism 401 and the first side surface 43 of the prism assembly 40 (that is, the sixth sub-side surface 4025 of the second prism 402), the first side supporting surface 1021 is arranged opposite to the first side surface 43 of the prism assembly 40, and the extension direction of the first side supporting surface 1021 is also perpendicular to the first direction x.

[0067] It can be understood that by laminating the first sub-side surface 4013 of the first prism 401 with the first side bearing surface 1021, the prism assembly 40 can be positioned in the first direction x. Further, by laminating the fifth sub-side surface 4024 of the second prism 402 with the second side bearing surface 1022, the prism assembly 40 can be supported more conveniently, thereby avoiding misalignment of the gluing surface 45 of the prism assembly 40 or forming a large air gap.

[0068] Please refer to Figure 7 and Figure 8 , Figure 7 yes Figure 1 Schematic diagram of the installation direction of the first limiter and the optical machine housing, Figure 8 yes Figure 7 Schematic diagram of the structure after the central optical machine housing and the first limiting member are assembled.

[0069] In this embodiment, the first stopper 51 is a square plate 511 having a hollow area, and the hollow area corresponds to the first side surface 43 of the prism assembly 40 (that is, the sixth sub-side surface 4025 of the second prism 402). A plurality of elastic members 512 are disposed on the square plate 511, and the plurality of elastic members 512 are disposed along a portion of the edge of the hollow area, and are used to abut against the edge of the first side surface 43.

[0070] In some implementations, a plurality of fixing holes 513 are disposed on the square plate 511 , and the fixing holes 513 are used to cooperate with the fixing members 515 to connect the first limiting member 51 to the optical machine housing 10 .

[0071] In some implementations, the first position-limiting member 51 is a prism spring, and the elastic member 512 is an elastic foot. In some specific implementations, the elastic member 512 is a metal elastic member.

[0072] In some embodiments, the number of the elastic members 512 can be set as needed, and the number of the elastic members 512 can be 2, 4 or more, which is not limited in the present application. Figure 2 and Figure 7 As shown, the number of elastic members 512 is four and they are symmetrically arranged on two opposite sides of the square plate 511 .

[0073] It can be understood that by symmetrically arranging the elastic members 512 , the first limiting member 51 can press the prism assembly 40 from two opposite sides.

[0074] In some implementations, the fixing member 515 is a screw.

[0075] It can be understood that locking the first limit member 51 to the optical machine housing 10 by screws from the first direction x can not only ensure the installation stability of the first limit member 51 and the optical machine housing 10, but also ensure the pressing effect of the first limit member 51 on the prism assembly 40 in the first direction x, thereby avoiding the formation of a large air gap on the bonding surface 45.

[0076] In some implementations, a plurality of positioning holes 514 are further provided on the square plate 511 , and the positioning holes 514 are used to cooperate with positioning posts on the optical machine housing 10 to further enhance the installation stability of the first limiting member 51 and the optical machine housing 10 .

[0077] In this embodiment, at least one groove is provided between the prism fixing cavity and the second side surface 44 , and glue is provided in the groove, so that the prism fixing cavity and the second side surface 44 are glued together by the glue.

[0078] In some embodiments, a groove is formed between the first sub-side surface 4013 of the first prism 401 and the prism fixing cavity. In other embodiments, a groove is formed between the second sub-side surface 4014 of the first prism 401 and the prism fixing cavity. In still other embodiments, a groove is formed between the first sub-side surface 4013 of the first prism 401 and the prism fixing cavity, and a groove is formed between the second sub-side surface 4014 of the first prism 401 and the prism fixing cavity, which is not limited in the present application.

[0079] Please refer to Fig. 9 , Fig. 9 yes Figure 1 Schematic diagram of the structure of the groove in the optical machine housing.

[0080] In this embodiment, a first groove 71 is formed between the first sub-side surface 4013 of the first prism 401 and the prism fixing cavity, and a second groove 72 is formed between the second sub-side surface 4014 of the first prism 401 and the prism fixing cavity.

[0081] In some embodiments, the first groove 71 is used to fill hard glue and soft glue, and the second groove 72 is used to fill hard glue. The hard glue is UV (Ultraviolet Light) light-cured acrylic glue, and the soft glue is naturally cured organic silicone glue or polyurethane glue.

[0082] In some specific implementations, the amount of glue filled in the first groove 71 is controlled to prevent the glue from overflowing from the gluing surface of the prism assembly 40 .

[0083] It can be understood that by dispensing glue in the first groove 71 and the second groove 72, the prism assembly 40 can be fixed while preventing the prism assembly 40 from being detached due to excessive force on the prism assembly 40, thereby improving the stability of the prism assembly 40 and the installation stability of the prism assembly 40 and the optical machine housing 10.

[0084] Please refer to Fig.10 and Fig.11 , Fig.10 yes Figure 1 Schematic diagram of the structure after the central optical machine housing and the second limiter are assembled, Fig.11 yes Figure 1 Schematic diagram of the installation direction of the middle cover and the optical machine housing.

[0085] In this embodiment, the second limiting member 52 is a pressure pad, and the pressure pad abuts against the second top surface 4021 of the second prism 402 .

[0086] In some embodiments, the pressure pad is a silicone pressure pad. In some specific embodiments, the silicone is a gas phase silicone with a hardness between 30° and 40° to ensure that the prism assembly 40 is moderately stressed and can be installed relatively stably.

[0087] It can be understood that the second limiting member 52 is only arranged on the second top surface 4021 of the second prism 402, and space can be reserved between the second limiting member 52 and the first groove 71 of the optical machine housing 10 to avoid the glue filled in the first groove 71 and the second limiting member 52 from interfering in space, thereby preventing the prism assembly 40 from being subjected to excessive force after the interference, thereby further improving the installation stability of the prism assembly 40.

[0088] In some embodiments, after glue is applied to the groove, the second limiting member 52 is pressed against the second top surface 4021 of the second prism 402 along the second direction y, and then the cover plate 60 is pressed against the second limiting member 52 and the top wall 11 of the optical machine housing 10 along the second direction y, and the cover plate 60 is installed on the optical machine housing 10 by screws, thereby ensuring the pressing effect of the second limiting member 52 on the prism assembly 40 in the second direction y, thereby avoiding the formation of a large air gap on the gluing surface 45.

[0089] In other embodiments, the second limiter 52 is integrally mounted with the cover plate 60 by means of a single-sided adhesive tape, and can be mounted on the optical machine housing 10 by one-time pressing, thereby reducing the processing steps and improving the processing effect.

[0090] It can be understood that by pressing the prism assembly 40 in the first direction x (direction of the light path) by the first limiting member 51 and pressing the prism assembly 40 in the second direction y perpendicular to the first direction x by the second limiting member 52, it is also possible to avoid misalignment of the bonding surface 45 in the first direction x and the second direction y, thereby further ensuring the stability of the light path and further improving the projection effect of the projection optical machine 100.

[0091] In this embodiment, the prism assembly 40 is first placed into the prism fixing cavity from the opening corresponding to the top wall 11 of the optical machine housing 10 along the second direction y, and the prism assembly 40 is positioned and supported by the bottom bearing surface 101 and the side bearing surface 102 provided in the prism fixing cavity. Then, the first stopper 51 is screwed to the optical machine housing 10 from the first direction x, so that the prism assembly 40 is pressed in the first direction x by the multiple elastic members 512 of the first stopper 51. Then, glue is dispensed in the first groove 71 and the second groove 72 to fix the prism assembly 40. Then, the second stopper 52 and the cover plate 60 are sequentially pressed on the top surface 41 of the prism assembly 40 along the second direction y, so that the prism assembly 40 is pressed in the second direction y by the second stopper 52. Finally, the projection lens 20 is fastened to the optical machine housing 10 by screws, and the spatial light modulator 30 is installed to the optical machine housing 10 by positioning posts, so as to complete the assembly of the projection optical machine 100 .

[0092] It can be understood that the above-mentioned multiple components have simple structures and sophisticated coordination, high reliability, simple manufacturing and assembly processes, low preparation costs, and the ability to be mass-produced.

[0093] Different from the prior art, the present application accommodates the prism assembly through the prism fixing cavity inside the optical machine housing, and provides a bearing surface on the prism fixing cavity that is in contact with the bottom surface and the second side surface of the prism assembly, so that the prism assembly can be positioned and supported by the bearing surface. Furthermore, by providing a first limiting member that abuts against the first side surface of the prism assembly, the prism assembly can be pressed in the first direction by the bearing surface and the first limiting member. At the same time, by providing a second limiting member that abuts against the top surface of the prism assembly, the prism assembly can be pressed in the second direction by the bearing surface and the second limiting member. Furthermore, by gluing the prism fixing cavity to at least a portion of the second side surface of the prism assembly, the prism assembly can be effectively fixed in the prism fixing cavity, thereby effectively fixing the optical machine housing and the prism assembly. The present application positions and glues the prism assembly through the supporting surface in the prism fixing cavity, and presses the prism assembly in the first direction and the second direction through the first limit member and the second limit member, so that the prism assembly can be reliably installed on the optical machine housing, thereby improving the reliability and stability of the projection optical machine, making the optical path more stable, and then meeting the use requirements of the projection optical machine in a vehicle environment.

[0094] The above description is only an implementation method of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A projection light machine, used for modulating incident illumination light into image light and emitting it, characterized in that: include: A spatial light modulator, a projection lens, a prism fixing cavity, and a prism assembly fixed in the prism fixing cavity, wherein the spatial light modulator and the projection lens are respectively located on opposite sides of the prism fixing cavity, and the illumination light incident on the projection optical machine is guided to the spatial light modulator via the prism assembly to be modulated to form image light, and the image light is emitted from the spatial light modulator and then transmits through the prism assembly to enter the projection lens, and is projected to the outside via the projection lens to form a projection image; The direction in which the image light is emitted from the spatial light modulator and then transmitted through the prism assembly into the projection lens is defined as a first direction, the prism assembly comprises a top surface and a bottom surface arranged opposite to each other, and a first side surface and a second side surface connecting the top surface and the bottom surface, the extension direction of the first side surface is perpendicular to the first direction, the arrangement direction of the top surface and the bottom surface is defined as a second direction; the second direction is perpendicular to the first direction; A bearing surface is provided in the prism fixing cavity, and the bearing surface is in contact with the bottom surface and the second side surface of the prism assembly; The prism fixing cavity is glued to at least a portion of the second side surface; a first stopper, abutting against the first side surface, and used to press the prism assembly into the prism fixing cavity along the first direction; The second limiting member is in contact with the top surface and is used to press the prism assembly into the prism fixing cavity along the second direction.

2. The projection optical machine according to claim 1, characterized in that: At least one groove is arranged between the prism fixing cavity and the second side surface, glue is arranged in the groove, and the prism fixing cavity and the second side surface are glued together by the glue.

3. The projection optical machine according to claim 2, characterized in that: The supporting surface includes a bottom supporting surface and a side supporting surface. The bottom supporting surface is in contact with the bottom surface of the prism assembly, and the side supporting surface is in contact with the second side surface of the prism assembly.

4. The projection optical machine according to claim 3, characterized in that: The prism assembly includes a first prism and a second prism; the first prism includes a first top surface and a first bottom surface that are oppositely arranged, and a first sub-side surface, a second sub-side surface, and a third sub-side surface that connect the first top surface and the first bottom surface end to end; the second prism includes a second top surface and a second bottom surface that are oppositely arranged, and a fourth sub-side surface, a fifth sub-side surface, and a sixth sub-side surface that connect the second top surface and the second top surface end to end; Wherein, the third sub-side surface of the first prism is glued to the fourth sub-side surface of the second prism to form the prism assembly; The first sub-side surface, the second sub-side surface and the fifth sub-side surface of the first prism form the second side surface of the prism assembly; the first sub-side surface and the sixth sub-side surface are arranged opposite to each other, and the sixth sub-side surface of the second prism forms the first side surface of the prism assembly; The first top surface of the first prism and the second top surface of the second prism form the top surface of the prism assembly; the first bottom surface of the first prism and the second bottom surface of the second prism form the bottom surface of the prism assembly.

5. The projection optical machine according to claim 4, characterized in that: A groove is formed between the first sub-side surface of the first prism and the prism fixing cavity; and / or, A groove is formed between the second sub-side surface of the first prism and the prism fixing cavity.

6. The projection optical machine according to claim 4, characterized in that: The first limiting member is a square plate having a hollow area, and the hollow area corresponds to the first side surface of the prism assembly; a plurality of elastic members are arranged on the square plate, and the plurality of elastic members are arranged along a partial edge of the hollow area for abutting against the edge of the first side surface.

7. The projection optical machine according to claim 4, characterized in that: The second limiting member is a pressure pad, and the pressure pad abuts against the second top surface of the second prism.

8. The projection optical machine according to claim 4, characterized in that: The bottom supporting surface includes a first bottom supporting surface and a second bottom supporting surface. The first bottom supporting surface is in contact with the first bottom surface of the first prism, and the second bottom supporting surface is in contact with the second bottom surface of the second prism.

9. The projection optical machine according to claim 4, characterized in that: The side supporting surface includes a first side supporting surface and a second side supporting surface, the first side supporting surface is in contact with the first sub-side surface of the first prism, and the second side supporting surface is in contact with the fifth sub-side surface of the second prism.

10. The projection optical machine according to claim 1, characterized in that: The optical projection machine further includes a cover plate, which is disposed on a side surface of the second limiting member away from the top surface and is used to cover the top surface of the prism assembly.

Images