Optical machine and projector

Abstract

The utility model relates to an optical machine, and the optical machine comprises a light modulation chip which is used for receiving light source light and modulating the light source light into first light and second light which are emitted in different directions; the beam splitter prism is arranged on one side of the light modulation chip and used for guiding the light source light to the light modulation chip and receiving the first light and the second light; the light shielding piece is arranged between the beam splitter prism and the light barrier, and at least part of the second light irradiates the light shielding piece; the shading piece is used for transmitting heat generated after the second light is absorbed to the beam splitter prism. The ray machine provided by the utility model can reduce the condensation probability of the beam splitter prism, thereby preventing the projection image from generating halo, and facilitating the improvement of the image quality. The utility model also relates to a projector using the optical machine.

Description

Technical Field

[0001] The present application relates to an optical machine and a projector using the optical machine. Background Art

[0002] For projector optical machines that use a digital micromirror device (DMD) as a light modulation chip, the DMD chip modulates the image light by reflecting the light source light separately through a large number of micromirrors. Therefore, in addition to the image light projected from the optical machine, there is also invalid light that is reflected into the interior of the optical machine and absorbed by the light shield or the inner wall of the optical machine. During the use of the optical machine, the invalid light irradiates the interior of the optical machine, causing the temperature of the light shield or the optical machine housing to rise, and a temperature difference is generated with the beam splitter prism inside the optical machine, causing water vapor condensation on the surface of the beam splitter prism, which in turn causes haloing of the image projected by the optical machine, affecting the image quality. Utility Model Content

[0003] The present application discloses an optical machine and a projector using the optical machine, which can reduce the probability of condensation on a partial light prism in the optical machine and ensure image quality.

[0004] In a first aspect, the present application relates to an optical machine, comprising:

[0005] A light modulation chip, used for receiving light from a light source, and modulating the light from the light source into a first light and a second light emitted in different directions;

[0006] a beam splitter prism, disposed on one side of the light modulation chip, for guiding the light from the light source to the light modulation chip, and for receiving the first light and the second light;

[0007] a lens module, disposed on a side of the beam splitter prism away from the light modulation chip, for receiving the first light emitted from the beam splitter prism and for projecting the first light; and

[0008] A shading member is disposed between the beam splitter prism and the light blocking plate, and the second light is at least partially irradiated onto the shading member; the shading member is used to transfer heat generated after absorbing the second light to the beam splitter prism.

[0009] The optical machine disclosed in the embodiment of the present application, by setting a shading member on the side of the beam splitter prism away from the light modulation chip, can make the shading member absorb a part of the second light and transfer the generated heat to the beam splitter prism, thereby increasing the temperature of the beam splitter prism, and then reducing the temperature difference between the beam splitter prism and other structures in the optical machine, thereby reducing the probability of water vapor condensation on the surface of the beam splitter prism, preventing the first light projected by the optical machine from generating a halo, which is beneficial to ensuring image quality.

[0010] In one embodiment, the light shielding member is a baffle disposed on a side of the beam splitter prism away from the light modulation chip, and the light shielding member is used to shield a portion of the second light.

[0011] In one embodiment, the thickness of the shading element is 0.2 mm-1.0 mm.

[0012] In one embodiment, the distance between the light shielding element and a surface of the beam splitter prism away from the light modulation chip is less than 0.5 mm.

[0013] In one embodiment, the relative positions of the shading element and the beam splitting prism are adjustable.

[0014] In one embodiment, the optical machine further comprises a fixing member disposed on the beam splitter prism, wherein the fixing member is used to fix the beam splitter prism; and the light shielding member is integrally formed with the fixing member.

[0015] In one embodiment, a surface of the dichroic prism away from the light modulation chip defines a first area and a second area, the first light passes through the first area to be projected out from the dichroic prism, and the second light passes through the second area to be projected out; the shading element at least partially covers the second area.

[0016] In one embodiment, the light shielding member is a semi-transparent film layer disposed on a surface of the beam splitter prism away from the light modulation chip, and the light shielding member covers the second area.

[0017] In one embodiment, the light shielding member is a hollow film layer covering the second area, and the light shielding member blocks at least a portion of the second light.

[0018] In one embodiment, a light shielding layer is further provided on a side of the lens module close to the beam splitting prism, and the light shielding layer does not overlap with the optical path of the first light.

[0019] In a second aspect, the present application relates to a projector, comprising:

[0020] The optical machine described in any one of the above embodiments.

[0021] The projector provided in the embodiment of the present application, by adopting the optical machine in the above embodiment, can increase the temperature difference between the dichroic prism in the optical machine and other structures in the optical machine during use, thereby reducing the probability of water vapor condensation on the surface of the dichroic prism, thereby preventing the first light projected by the optical machine from generating a halo, which is beneficial to ensuring image quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 It is a schematic diagram of the structure of the optical machine in the first embodiment provided in this application.

[0024] Figure 2 yes Figure 1 Schematic diagram of the explosion structure.

[0025] Figure 3 It is a schematic diagram of the optical path of the optical machine in the embodiment provided in this application.

[0026] Figure 4 It is a schematic diagram of the light distribution on the surface of the beam splitter prism in the embodiment provided in this application.

[0027] Figure 5 It is a schematic structural diagram of the beam splitter prism and the light shielding element in the first embodiment provided in the present application.

[0028] Figure 6 It is a schematic diagram of the positions of the beam splitter prism and the light shielding element in another embodiment provided by the present application.

[0029] Figure 7 It is a structural schematic diagram of a shading member in another embodiment provided in the present application.

[0030] Figure 8 It is a schematic structural diagram of the shading element in the second embodiment provided in the present application.

[0031] Fig. 9 It is a schematic diagram of a hollow pattern of a shading member in an embodiment provided in the present application.

[0032] Fig.10 It is a schematic diagram of a hollow pattern of a shading member in another embodiment provided in the present application.

[0033] Fig.11 It is a schematic diagram of a hollow pattern of a shading member in another embodiment provided in the present application.

[0034] Main component symbols

[0035] Optical Machine 100

[0036] Optical modulation chip 10

[0037] Housing 20

[0038] Beam splitter prism 30

[0039] First prism 31

[0040] Second prism 33

[0041] Surface 331

[0042] First Area 32

[0043] Second area 34

[0044] Shading element 50, 250

[0045] Light shielding parts 251, 253, 255

[0046] Hollow parts 252, 254, 256

[0047] Fixing 60

[0048] Light barrier 70

[0049] Light shielding portion 71

[0050] Heat dissipation unit 73

[0051] Cooling fins 731

[0052] Galvanometer 80

[0053] Lens module 90

[0054] Light source L

[0055] First Light L1

[0056] Second Light L3

[0057] The following specific implementation methods will further illustrate the present application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0058] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0059] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may be a component centered thereon. When a component is referred to as being "connected to" another component, it may be directly connected to the other component or there may be a component centered thereon. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0060] It should be noted that the concepts such as "first" and "second" mentioned in this application are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0061] The DMD chip is a light modulation chip with multiple micro-reflection units arranged on the surface. Each micro-reflection unit has two states: "on" and "off". In different states, the micro-reflection unit deflects to different angles, so that the light projected on the micro-reflection unit is reflected and emitted in different directions. When the DMD chip is used in the projector optical machine, in the "on" state, the micro-reflection unit reflects the received light source light in one direction as part of the image light projected onto the projection medium; in the "off" state, the micro-reflection unit reflects the received light source light in another direction to avoid it being projected onto the projection medium. Therefore, the DMD chip usually reflects the first light used to project the image, and the second light that does not need to be projected from the optical machine at the same time. The emission directions of the first light and the second light are different.

[0062] Generally speaking, the structure of the optical machine itself is set to absorb the second light, so as to prevent the second light from leaking from the optical machine or reflecting onto the optical path of the first light, affecting the quality of the projected image. However, since the optical machine generates heat after absorbing the second light, the temperature rises and the temperature of the air inside the optical machine rises. The dichroic prism used to guide the light source light, the first light and the second light in the optical machine usually does not increase the temperature too much due to its high light transmittance. Therefore, during the use of the optical machine, a large temperature difference will be generated between the dichroic prism and other structures in the optical machine, causing the higher temperature air to flow toward the lower temperature surface of the dichroic prism. When it contacts the surface of the dichroic prism, the temperature difference will cause the water vapor in the air to condense and form dew, resulting in water droplets on the surface of the dichroic prism. After the water droplets cover the optical path of the first light, they will affect the first light, causing the projected image to produce a halo, affecting the use effect.

[0063] Water vapor condensation is affected by many factors, including the humidity of the air, the temperature of the surface of the beam splitter prism, the temperature difference between the beam splitter prism and other structures in the optical machine, etc. Specifically, the higher the humidity of the air, the lower the temperature of the surface of the beam splitter prism, the higher the temperature difference between the beam splitter prism and other structures in the optical machine, and the easier it is for water vapor to condense. The temperature of other structures in the optical machine is related to the overall brightness of the optical machine and the brightness of the played picture. The higher the overall brightness, the higher the energy of the second light received by the optical machine, the darker the content of the played picture, and the higher the proportion of the second light. Therefore, when the optical machine is in a low temperature and high humidity environment, when using a high-brightness mode to play a dark picture, it is easier to produce condensation on the surface of the beam splitter prism, and the halo of the projected picture is more obvious.

[0064] Embodiment 1

[0065] Please also read Figure 1 and Figure 2 , Embodiment 1 of the present application provides an optical machine 100, comprising an optical modulation chip 10, a housing 20, a beam splitter prism 30, a shading member 50, a light blocking plate 70, a galvanometer 80, and a lens module 90. The beam splitter prism 30 is used to receive light from a light source and guide the light from the light source to the optical modulation chip 10. The optical modulation chip 10 is used to modulate the light from the light source into a first light and a second light emitted in different directions. The shading member 50 is disposed on a side of the beam splitter prism 30 away from the optical modulation chip 10. The light blocking plate 70 is disposed on a side of the beam splitter prism 30 away from the beam splitter prism 30. The shading member 50 and the light blocking plate 70 are respectively used to receive part of the second light, and the shading member 50 is also used to transfer the heat generated after absorbing the second light to the beam splitter prism 30. The lens module 90 is disposed on a side of the light blocking plate 70 away from the beam splitter prism 30, and is used to receive the first light emitted from the beam splitter prism 30, and project the first light out. The galvanometer 80 is disposed between the light shielding plate 70 and the lens module 90 for modulating the first light. The housing 20 is used to accommodate the light modulation chip 10 , the beam splitter prism 30 , the light shielding member 50 , the light shielding plate 70 and the galvanometer 80 .

[0066] See also Figure 3 The beam splitter prism 30 includes a first prism 31 and a second prism 33 which are bonded to each other. The first prism 31 and the second prism 33 are triangular prisms, and one cylindrical surface of the first prism 31 and the second prism 33 is bonded to each other. The light source light L is incident from one side of the first prism 31, and is reflected at the interface between the first prism 31 and the second prism 33, so as to be emitted from the other side of the first prism 31 to the light modulation chip 10. The light modulation chip 10 modulates the light source light L into a first light L1 and a second light L3 which are emitted in two different directions. The first light L1 passes through the first prism 31 and the second prism 33 in sequence, so as to be emitted from the beam splitter prism 30. The second light L3 passes through the first prism 31 and the second prism 33 in sequence, so as to be projected onto the light shielding member 50 and the light blocking plate 70. Among them, the light shielding member 50 absorbs a part of the second light L3, and the light blocking plate 70 absorbs another part of the second light L3.

[0067] See also Figure 4In this embodiment, on the surface 331 of the beam splitter 30 away from the optical modulation chip 10, the first light L1 is irradiated to the center of the surface 331, and the second light L3 is irradiated to a corner of the surface 331. The surface 331 is defined with a first area 32 and a second area 34. The first light L1 is emitted from the beam splitter 30 through the first area 32, and the second light L3 is partially projected onto the light shielding plate 70 through the second area 34. The light shielding member 50 at least partially covers the second area 34, so that the second light L3 is partially projected onto the light shielding member 50. During the operation of the optical machine 100, the part of the second area 34 that is not irradiated by the second light L3 usually has no light passing through it. According to the overall brightness of the optical machine 100 when it is working, the spot size of the first light L1 and the second light L3 will change, and the range of the first area 32 is the maximum brightness that the first light L1 can theoretically reach. In other embodiments, the spot position of the second light L3 will change according to the position of the optical modulation chip 10. For example, the position of the light spot of the second light L3 can be at the lower left corner, lower right corner, or upper right corner of the first area 32, and the present application does not impose any limitation on this.

[0068] Please also read Figure 3 and Figure 5 In the present embodiment, the shading member 50 is specifically a baffle disposed on the side of the beam splitter prism 30 away from the light modulation chip 10. The shading member 50 extends from one end to the other end of the beam splitter prism 30 to block a portion of the second light L3.

[0069] Specifically, the material of the light shielding member 50 can be a heat-resistant material such as 304 stainless steel, 5052 aluminum alloy, phosphor bronze or spring steel. The light shielding member 50 is used to absorb a portion of the second light L3, thereby reducing the energy of the second light L3 received by the light shielding plate 70, thereby reducing the temperature increase of the light shielding plate 70, and further reducing the temperature difference between the light shielding plate 70 and the beam splitting prism 30.

[0070] The thickness of the shading member 50 can be 0.2 mm to 1.0 mm. Specifically, the thickness of the shading member 50 can be any value in the range of, for example, 0.2 mm to 0.4 mm, 0.4 mm to 0.6 mm, 0.6 mm to 0.8 mm, or 0.8 mm to 1.0 mm, and this application does not impose any limitation on this. According to the specific parameters of the optical machine 100 (such as the brightness of the light source light L, the size of the light modulation chip 10, etc.), the thickness of the shading member 50 can be set accordingly, thereby controlling the ability of the shading member 50 to absorb heat.

[0071] The spacing between the shading member 50 and the surface 331 is less than 0.5 mm. Specifically, the shading member 50 can be directly attached to the surface 331, or spaced apart from the surface 331, and the spacing between the shading member 50 and the surface 331 can be any value within the range of 0-0.1 mm, 0.1 mm-0.2 mm, 0.2 mm-0.3 mm, 0.3 mm-0.4 mm, 0.4 mm-0.5 mm, and the present application does not impose any restrictions on this. By setting the spacing between the shading member 50 and the surface 331 to be less than 0.5 mm, the heat generated by the shading member 50 after absorbing the second light L3 can be transferred to the beam splitter prism 30, thereby reducing the temperature increase of the light blocking plate 70 while increasing the temperature of the beam splitter prism 30, thereby further reducing the temperature difference between the light blocking plate 70 and the beam splitter prism 30.

[0072] In another embodiment, see Figure 6 . The shading member 50 may also be disposed only on a portion of the optical path of the second light L3, so as to only block and absorb a portion of the second light L3. The area of ​​the second light L3 covered by the shading member 50 may be set according to specific needs. Specifically, the distance between the edge of the shading member 50 close to the first area 32 and the first area 32 may be set to adjust the degree of blocking of the second light L3 by the shading member 50. In other embodiments, the shading member 50 may also be set to be adjustable in relative position to the beam splitter prism 30, so as to adjust the degree of blocking of the second light L3 by the shading member 50 according to actual needs.

[0073] In yet another embodiment, see Figure 7 The shading member 50 can also be set as a ring structure surrounding the entire second area 34, so as to fully conduct the heat converted after absorbing part of the second light L3 to the beam splitter prism 30. The present application does not limit the specific size and shape of the shading member 50, as long as the shading member 50 is set corresponding to the second area 34 and blocks part of the second light L3, it is within the scope of the present application.

[0074] In this embodiment, please refer to Figure 5 The optical machine 100 also includes a fixing member 60, which is disposed on the dichroic prism 30 and is used to fix the dichroic prism 30. The shading member 50 is integrally formed with the fixing member 60. Specifically, the fixing member 60 is a frame disposed on the side of the dichroic prism 30, one end of the fixing member 60 is connected to the housing 20, and the other end is provided with an elastic member, which can snap and fix the dichroic prism 30. The shading member 50 is directly integrally formed with the fixing member 60, and extends from one end of the dichroic prism 30 to the other end. The optical machine 100 provided in the embodiment of the present application can reduce the difficulty of assembly by integrally forming the fixing member 60 and the shading member 50, which is conducive to cost saving.

[0075] Please continue reading Figure 7In another embodiment, the shading member 50 and the fixing member 60 may also be two independent components. The shading member 50 is attached to the surface 331 of the beam splitter prism 30 , and the fixing member 60 is used to press and fix the shading member 50 on the surface 331 while fixing the beam splitter prism 30 .

[0076] Please refer to Figure 3 The light blocking plate 70 includes a light blocking portion 71 and a heat dissipation portion 73. The light blocking portion 71 is used to receive the second light L3. The heat dissipation portion 73 is connected to the light blocking portion 71 and is used to conduct the heat generated by the light blocking portion 71 after being illuminated, thereby dissipating the heat. Specifically, a plurality of raised heat dissipation fins 731 are provided on the surface of the heat dissipation portion 73 away from the side of the light blocking portion 71, thereby increasing the surface area of ​​the heat dissipation portion 73 and facilitating heat dissipation. The light blocking plate 70 may be provided separately from the housing 20, or may be integrally formed with the housing 20, and the present application does not impose any restrictions on this. In other embodiments, the optical machine 100 may also not include the light blocking plate 70, and the housing 20 extends to the position of the heat dissipation portion 73, thereby enclosing the beam splitting prism 30 and absorbing excess second light.

[0077] The galvanometer 80 is used for periodically deflecting to change the direction in which the first light L1 is refracted and emitted, so that the first light L1 can be periodically projected at different positions, thereby expanding the number of pixels of the projected image and improving the resolution of the projected image.

[0078] A light shielding layer may also be provided on the side of the lens module 90 close to the beam splitter prism 30. The light shielding layer does not overlap with the optical path of the first light L1. The light shielding layer is used to absorb the second light L3 or external stray light, thereby increasing the temperature of the optical element on the side of the lens module 90 close to the beam splitter prism 30 to avoid condensation on the surface of the lens module 90. The light shielding layer may be attached to the lens module 90 by spraying, printing or coating, and may be set to an opaque material or a semi-transparent material, which is not limited in the present application.

[0079] The optical machine 100 provided in the first embodiment of the present application can block a portion of the second light L2 projected onto the light blocking plate 70 by providing a light shielding member 50, thereby reducing the temperature difference between the light blocking plate 70 and the beam splitter 30 by reducing the temperature rise of the light blocking plate 70. The light shielding member 50 can also transfer the heat converted by the light shielding member 50 after absorbing a portion of the second light L3 to the beam splitter 30, thereby reducing the temperature difference between the beam splitter 30 and other structures of the optical machine 100 by increasing the temperature of the beam splitter 30. By reducing the temperature difference between the beam splitter 30 and other structures of the optical machine 100, the probability of condensation of water vapor on the surface of the beam splitter 30 can be reduced, which is beneficial to avoiding the phenomenon of halo in the image of the first light L1 projected by the optical machine 100, and is beneficial to ensuring image quality and improving user experience.

[0080] In the first embodiment of the present application, the light shielding member 50 is set as a baffle plate set on the side of the beam splitter prism 30 away from the light modulation chip 10, and its structure is simple, and it can adapt to a larger beam splitter prism 30, which is conducive to reducing costs. By setting the light shielding member 50 to be a heat-resistant material, it can withstand higher temperatures, which is conducive to improving the stability of the optical machine 100. By forming the light shielding member 50 and the fixing member 60 in one piece, it is conducive to further reducing costs and reducing the difficulty of assembly.

[0081] Embodiment 2

[0082] See also Figure 8 The optical machine 100 provided in the second embodiment of the present application includes a light modulation chip 10, a housing 20, a beam splitter prism 30, a light shielding member 250, a light baffle 70, a galvanometer 80, and a lens module 90. The structures and positional relationships of the light modulation chip 10, the housing 20, the beam splitter prism 30, the light baffle 70, the galvanometer 80, and the lens module 90 are the same as those in the first embodiment. The difference from the first embodiment is that the light shielding member 250 is a film layer disposed on the surface 331 of the beam splitter prism 30 away from the light modulation chip 10. The light shielding member 250 at least partially covers the second area 34 and does not overlap with the first area 32.

[0083] Specifically, in the present embodiment, the shading member 250 completely covers the second area 34, and the shading member 250 is specifically a translucent film layer. The shading member 250 can be attached to the surface 331 of the beam splitter prism 30 by spraying paint or coating. The light transmittance of the shading member 250 can be set according to specific needs. For example, the light transmittance of the shading member 250 can be set to any value in the range of 0-20%, 20%-40%, 40%-60%, 60%-80% and 80%-100%, and the present application does not limit this.

[0084] In other embodiments, the shading member 250 may also be a hollow coating layer covering the second region 34 , and the shading member 250 blocks a portion of the second light L3 and transmits another portion of the second light L3 .

[0085] Specifically, see Fig. 9 In this embodiment, the shading member 250 includes a plurality of shading portions 251 arranged in parallel, and each shading portion 251 is a film layer having a certain width. The shading portion 251 can be attached to the surface 331 by means of shielding spraying, printing or coating. The shading portion 251 can be set to an opaque material or a translucent material. A hollow portion 252 is formed between two adjacent shading portions 251, so that the second light L3 can pass through the hollow portion 252 and be projected onto the light blocking plate 70.

[0086] See also Fig.10In another embodiment, the shading member 250 may include a patterned shading portion 253, and the shading portion 253 forms a honeycomb structure, that is, the shading portion 253 is formed into a plurality of hexagons with adjacent sides. A hollow portion 254 is formed in the middle of each hexagon, and the second light L3 passes through the hollow portion 254, thereby projecting onto the light shielding plate 70. Among them, the shading portion 253 can be attached to the surface 331 by means of shielding spraying, printing or coating. The shading portion 253 can be set as an opaque material or a translucent material. Only a part of the shading portion 253 absorbs the second light L3, and the shading portion 253 extending and covering the second area 34 can also uniformly transfer the heat converted by absorbing the second light L3 to the surface 331 of the beam splitter prism 30, thereby increasing the temperature of the beam splitter prism 30. In other embodiments, the shading portion 253 can also extend and cover part of the hollow portion 254, thereby increasing the area ratio of the shading portion 253, and the present application does not limit this.

[0087] See also Fig.11 In another embodiment, the shading member 250 may include a patterned shading portion 255, and the shading portion 253 forms a cross-arranged grid. A hollow portion 256 is formed in the middle position of each grid, and the second light L3 passes through the hollow portion 256, thereby projecting onto the light shielding plate 70. Among them, the shading portion 255 can be attached to the surface 331 by means of shielding spraying, printing or coating. The shading portion 255 can be set as an opaque material or a translucent material. Only a part of the shading portion 255 absorbs the second light L3, and the shading portion 255 extending and covering the second area 34 can also uniformly transfer the heat converted by absorbing the second light L3 to the surface 331 of the dichroic prism 30, thereby increasing the temperature of the dichroic prism 30. In other embodiments, the shading portion 255 can also extend and cover part of the hollow portion 256, thereby increasing the area ratio of the shading portion 255, and the present application does not limit this.

[0088] In other embodiments, the shading member 250 may also be configured as other patterned hollow film layers, and the present application does not impose any limitation thereto. As long as it can block a portion of the second light L3 projected onto the light blocking plate 70 , it is within the scope of the present application.

[0089] The optical machine 100 provided in the second embodiment of the present application can block a portion of the second light L2 projected onto the light blocking plate 70 by setting the light blocking member 250 as a hollow film layer attached to the surface 331 of the beam splitter 30, thereby reducing the temperature difference between the light blocking plate 70 and the beam splitter 30 by reducing the temperature rise of the light blocking plate 70. The heat converted by the light blocking member 250 after absorbing a portion of the second light L3 can also be conducted to the beam splitter 30, thereby reducing the temperature difference between the light blocking plate 70 and the beam splitter 30 by increasing the temperature of the beam splitter 30. By reducing the temperature difference between the light blocking plate 70 and the beam splitter 30, the probability of condensation on the surface of the beam splitter 30 can be reduced, which is conducive to avoiding the phenomenon of halo in the image of the first light L1 projected by the optical machine 100, and is conducive to ensuring image quality and improving user experience.

[0090] In the second embodiment of the present application, the light shielding member 50 is provided as a film layer coated on the surface 331 of the beam splitter prism 30, which is conducive to reducing the volume of the light shielding member 50, thereby improving the space utilization rate of the optical machine 100, and making the light shielding member 50 adaptable to the small volume optical machine 100. By providing the light shielding member 50 by spraying, coating, etc., it is also possible to avoid scratching the beam splitter prism 30 during the assembly process of the optical machine 100, which is conducive to improving the yield rate of the optical machine 100.

[0091] The above descriptions are merely embodiments of the present application and are not intended to 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 applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. An optical machine, characterized in that: include: A light modulation chip, used for receiving light from a light source, and modulating the light from the light source into a first light and a second light emitted in different directions; a beam splitter prism, disposed on one side of the light modulation chip, for guiding the light from the light source to the light modulation chip, and for receiving the first light and the second light; a lens module, disposed on a side of the beam splitter prism away from the light modulation chip, for receiving the first light emitted from the beam splitter prism, and for projecting the first light out; as well as A shading member is provided on a side of the beam splitter prism away from the light modulation chip, and the second light is at least partially irradiated onto the shading member; the shading member is used to transfer heat generated after absorbing the second light to the beam splitter prism.

2. The optical machine according to claim 1, characterized in that: The light shielding member is a baffle plate arranged on a side of the beam splitter prism away from the light modulation chip, and the light shielding member is used to shield a part of the second light.

3. The optical machine according to claim 2, characterized in that: The thickness of the shading element is 0.2 mm-1.0 mm.

4. The optical machine according to claim 2, characterized in that: The distance between the light shielding member and a surface of the beam splitter prism away from the light modulation chip is less than 0.5 mm.

5. The optical machine according to claim 2, characterized in that: The relative positions of the shading element and the beam splitting prism are adjustable.

6. The optical machine according to claim 2, characterized in that: It also includes a fixing piece arranged on the beam splitter prism, and the fixing piece is used to fix the beam splitter prism; the shading piece and the fixing piece are integrally formed.

7. The optical machine according to claim 1, characterized in that: The surface of the dichroic prism away from the light modulation chip defines a first area and a second area, the first light is projected out from the dichroic prism through the first area, and the second light is projected out through the second area; the shading member at least partially covers the second area.

8. The optical machine according to claim 7, characterized in that: The shading member is a semi-transparent film layer arranged on the surface of the beam splitter prism away from the light modulation chip, and the shading member completely covers the second area.

9. The optical machine according to claim 7, characterized in that: The shading member is a hollow film layer covering the second area, and the shading member blocks at least a portion of the second light.

10. The optical machine according to claim 1, characterized in that: A light shielding layer is also provided on one side of the lens module close to the beam splitter prism, and the light shielding layer does not overlap with the optical path of the first light.

11. A projector, characterized in that: include: An optical machine according to any one of claims 1 to 10.

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