Projector lens structure and projection equipment

Abstract

The invention discloses a projector lens structure and projection equipment, and relates to the technical field of projection equipment, the projector lens structure comprises a shell, a lens assembly and a reflector assembly, the shell is provided with a light inlet and a light outlet, the light inlet and the light outlet are arranged in a staggered manner, three light path channels which are communicated in sequence are formed in the shell, and the reflector assembly is arranged in the shell. The extension directions of every two adjacent light path channels intersect, the lens assembly comprises a plurality of lenses, the lenses are distributed in the first light path channel and the second light path channel, and the reflector assembly is arranged in at least part of the light path channels and used for changing the propagation direction of light after the light enters. According to the invention, the propagation direction of the light is greatly changed through the reflector assembly, so that the light can pass through the three light path channels which are communicated in sequence, thereby changing the appearance of the projector lens, reducing or adjusting the appearance size of the projector lens, and saving or adjusting the structural space occupied by the projector lens.

Description

Technical Field

[0001] The present invention relates to the technical field of projection devices, and particularly relates to a projector lens structure and a projection device. Background Art

[0002] Ultra-short throw projectors can project large-sized images at a relatively short projection distance. When projecting images of the same size, the installation distance is shorter than that of long-throw projectors. Therefore, it avoids the user's obstruction of the projection light and the direct projection of the projection light into the human eye, making interactive projection more feasible.

[0003] Existing ultra-short throw lenses are restricted by both optical design and physical structure. The lens groups often need to be longitudinally stacked along the optical axis direction, resulting in the physical length of the device in the optical axis extension direction being greater than the lateral dimension. This long-strip structural feature requires a large amount of space in a certain direction during device installation. In application scenarios such as home theaters and educational projections, when the distance between the wall and the projection surface is limited, it is necessary to adjust the installation angle additionally or sacrifice part of the projection size. In addition, the excessive size in a certain direction also limits the installation of the device in a compact space. Summary of the Invention

[0004] The main object of the present invention is to provide a projector lens structure and a projection device, aiming to solve the problem that the existing projector lens structure has an excessive size in a certain direction.

[0005] To achieve the above object, the present invention provides a projector lens structure, which includes:

[0006] A housing having a light inlet and a light outlet, the light inlet and the light outlet are arranged staggeredly, and three optical path channels are formed inside the housing and are sequentially connected. The three optical path channels include a first optical path channel, a second optical path channel, and a third optical path channel. The extending directions of every two adjacent optical path channels intersect, and the ports of the first optical path channel and the third optical path channel respectively form the light inlet and the light outlet;

[0007] A lens assembly including a plurality of lenses, and the plurality of lenses are distributed in the first optical path channel and the second optical path channel; and,

[0008] A mirror assembly disposed in at least part of the optical path channel for changing the refraction direction of the light after the light enters.

[0009] In an embodiment, the two mirrors include a first mirror and a second mirror. The first mirror is obliquely placed at the connection of the first optical path channel and the second optical path channel, and the second mirror is placed at the connection of the second optical path channel and the third optical path channel. The reflecting surfaces of the first mirror and the second mirror are arranged oppositely.

[0010] In one embodiment, the housing includes:

[0011] A first housing, a chamber is formed inside the first housing, the chamber includes a first accommodating cavity and a second accommodating cavity that communicate with each other, the first accommodating cavity extends in the up and down direction, and the lower wall surface penetrates the first housing to form the light inlet, the first accommodating cavity forms the first optical path channel, the second accommodating cavity extends in the left and right direction, and a wall surface penetrates the first housing; and,

[0012] A second housing, which is disposed on the right side of the first housing and is connected to the first housing, the second housing has a third accommodating cavity that opens towards the first housing, the third accommodating cavity communicates with the second accommodating cavity, an optical outlet is provided on a wall surface of the third accommodating cavity in the front-back direction or in the up-down direction, so that the optical outlet and the corresponding side wall of the third accommodating cavity jointly define the third optical path channel, and the remaining part of the third accommodating cavity and the second accommodating cavity jointly form the second optical path channel;

[0013] Wherein, the first mirror is disposed inside the first housing, and the second mirror is disposed inside the second housing.

[0014] In one embodiment, the first housing includes:

[0015] A mounting seat, the left end wall of the mounting seat is for mounting the first mirror, the mounting seat has the second accommodating cavity, and the right end wall of the mounting seat is connected to the second housing; and,

[0016] A mounting cylinder, the mounting cylinder is penetrated in the up and down direction to form the first accommodating cavity, the lower port of the mounting cylinder forms the light inlet, and the upper end of the mounting cylinder is connected to the lower side wall of the mounting seat.

[0017] In one embodiment, the left end wall of the mounting seat is inclined upward from left to right to form an inclined surface, and a mounting hole is opened on the inclined surface, and the reflecting surface of the first mirror corresponds to the mounting hole.

[0018] In one embodiment, the first housing further includes a mirror seat, the mirror seat covers the mounting hole, and the side wall of the mirror seat facing the mounting hole is recessed inward to form a groove for accommodating the first mirror.

[0019] In one embodiment, the mounting seat and the mirror seat are screwed and fixed; and / or,

[0020] A plurality of positioning holes are further provided on the mirror base, and a plurality of positioning posts are correspondingly provided on the left end wall of the mounting base, and the plurality of positioning posts can be inserted into the plurality of positioning holes.

[0021] In one embodiment, the light inlet and the light outlet are arranged offset in the left-right direction, both extending in the up-down direction, and the light inlet and the light outlet face the same or opposite directions; or,

[0022] The light inlet and the light outlet are arranged offset in the left-right direction, the light inlet extends in the up-down direction, and the light outlet extends in the front-back direction.

[0023] In one embodiment, the plurality of lenses include a front lens group and a rear lens group, the front lens group is arranged in the second optical path channel, and the rear lens group is arranged in the first optical path channel.

[0024] The present invention also provides a projection device, including the projector lens structure as described above, and the projector lens structure includes:

[0025] A housing having a light inlet and a light outlet, the light inlet and the light outlet are arranged offset, and three optical path channels communicating with each other in sequence are formed inside the housing. The three optical path channels include a first optical path channel, a second optical path channel, and a third optical path channel. The extending directions of every two adjacent optical path channels intersect, and the ports of the first optical path channel and the third optical path channel respectively form the light inlet and the light outlet;

[0026] A lens assembly including a plurality of lenses, and the plurality of lenses are distributed in the first optical path channel and the second optical path channel; and,

[0027] A mirror assembly arranged in at least part of the optical path channel for changing the refraction direction of light after the light enters.

[0028] In the technical solution of the present invention, by arranging the mirror assembly in the optical path channel inside the housing, the extending directions of adjacent optical path channels are made to intersect, that is, the optical path channels no longer extend in the same direction, but are decomposed into multiple channels in different directions, making the overall lens structure more compact. The multiple optical path channels can distribute the lens group that originally extended in a single direction to other directions, greatly shortening the physical length of the lens in the depth dimension and alleviating the installation limitation of the traditional long-strip structure. At the same time, the introduction of the mirror allows the lens group to work together on a non-linear path, maintaining the total optical path length to ensure the imaging quality while improving the space utilization rate through multi-directional arrangement. The projector lens structure provided by the present invention can change the shape of the projector lens, can reduce or adjust the external dimensions of the projector lens, and save or adjust the structural space occupied by the projector lens. Description of the Drawings

[0029] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0030] Figure 1 It is a schematic structural diagram of an embodiment of the projector lens structure provided by the present invention;

[0031] Figure 2 For Figure 1 It is a schematic structural diagram of another perspective of the projector lens structure;

[0032] Figure 3 For Figure 2 It is a schematic cross-sectional view of the projector lens structure along A-A;

[0033] Figure 4 For Figure 1 It is a schematic structural diagram of the mirror seat;

[0034] Explanation of the reference numerals in the drawings:

[0035] 1000, projector lens structure; 1, housing; 11, light inlet; 12, light outlet; 13, first housing; 14, mounting seat; 141, second accommodation cavity; 142, left end wall; 143, right end wall; 144, lower side wall; 15, mounting cylinder; 151, first accommodation cavity; 16, second housing; 161, third accommodation cavity; 17, mirror seat; 171, positioning hole; 2, optical path channel; 21, first optical path channel; 22, second optical path channel; 23, third optical path channel; 3, mirror assembly; 31, first mirror; 32, second mirror.

[0036] The realization, functional features and advantages of the object of the present invention will be further described in conjunction with the embodiments with reference to the drawings. Specific embodiments

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0038] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present invention, the directional indications are only used to explain the relative positional relationship, movement conditions, etc. between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0039] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel scenarios. Taking "A and / or B" as an example, it includes Scenario A, or Scenario B, or the scenario where both A and B are satisfied simultaneously. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement it. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0040] The ultra-short throw projector can project a large-size image within a relatively short projection distance. When projecting an image of the same size, its installation distance is shorter than that of a long-throw projector, thus avoiding the user's occlusion of the projection light and the direct projection of the projection light into the human eye, making interactive projection more feasible.

[0041] Due to the dual limitations of optical design and physical structure, the lens groups of existing ultra-short throw lenses often need to be longitudinally stacked and arranged along the optical axis direction, resulting in the physical length of the device in the optical axis extension direction being greater than the lateral dimension. This long-strip structural feature requires a large amount of space in a certain direction during device installation. In application scenarios such as home theaters and educational projections, when the distance between the wall and the projection surface is limited, it is necessary to additionally adjust the installation angle or sacrifice part of the projection size. In addition, the excessive size in a certain direction also limits the installation of the device in a compact space.

[0042] The main object of the present invention is a projector lens structure and a projection device, aiming to solve the problem that the existing projector lens structure has an excessive size in a certain direction.

[0043] Please refer to Figures 1 to 3, To achieve the above object, the present invention provides a projector lens structure 1000, which includes a housing 1, a lens assembly, and a mirror assembly 3. The housing 1 has a light inlet 11 and a light outlet 12, and the light inlet 11 and the light outlet 12 are arranged offset from each other. Three optical path channels 2 are formed inside the housing 1 and are sequentially connected. The three optical path channels 2 include a first optical path channel 21, a second optical path channel 22, and a third optical path channel 23. The extending directions of every two adjacent optical path channels 2 intersect. The ports of the first optical path channel 21 and the third optical path channel 23 respectively form the light inlet 11 and the light outlet 12. The lens assembly includes a plurality of lenses, and the plurality of lenses are distributed in the first optical path channel 21 and the second optical path channel 22. The mirror assembly 3 is disposed in at least part of the optical path channel 2 to change the propagation direction of light after the light enters.

[0044] In the technical solution of the present invention, by arranging the mirror assembly 3 in the optical path channel 2 inside the housing 1, the extending directions of adjacent optical path channels 2 are made to intersect, that is, the optical path channels 2 no longer extend in the same direction, but are decomposed into multiple channels in different directions, making the overall lens structure more compact. The multiple optical path channels 2 can distribute the lens group that originally extended in a single direction to other directions, greatly shortening the physical length of the lens in the depth dimension and alleviating the installation limitation of the traditional long-strip structure. At the same time, the introduction of the mirror allows the lens group to work together on a non-linear path, maintaining the total optical path length to ensure the imaging quality while improving the space utilization rate through multi-directional arrangement. The projector lens structure 1000 provided by the present invention can change the shape of the projector lens, can reduce or adjust the external dimensions of the projector lens, and save or adjust the structural space occupied by the projector lens.

[0045] Further, the two reflectors include a first reflector 31 and a second reflector 32. The first reflector 31 is obliquely placed at the connection of the first optical path channel 21 and the second optical path channel 22 to reflect the light in the first optical path channel 21 to the second optical path channel 22. The second reflector 32 is placed at the connection of the second optical path channel 22 and the third optical path channel 23 to reflect the light in the second optical path channel 2 to the third optical path channel 23. The reflecting surfaces of the first reflector 31 and the second reflector 32 are arranged oppositely. By arranging the reflecting surfaces of the first reflector 31 and the second reflector 32 oppositely, the optical path forms an orderly fold among multiple channels, significantly improving the spatial layout efficiency. The first reflector 31 is obliquely placed at the connection of the first optical path channel 21 and the second optical path channel 22 to deflect the incident light in the direction of the second optical path channel 22. The second reflector 32 further guides the optical path from the second optical path channel 22 to the third optical path channel 23. Through two reflections, two turns of the optical axis direction are achieved, and the optical path originally extending along a single depth direction can be decomposed into multiple optical paths distributed in different directions, effectively shortening the overall length of the lens and avoiding excessive stacking of the lens group in a single axial direction.

[0046] In order to form three sequentially connected optical path channels 2 inside the housing 1, in one embodiment, please refer to Figure 1 and Figure 3, the housing 1 includes a first housing 13 and a second housing 16. A chamber is formed inside the first housing 13, and the chamber includes a first accommodating cavity 151 and a second accommodating cavity 141 that communicate with each other. The first accommodating cavity 151 extends in the vertical direction, and its lower wall surface penetrates through the first housing 13 to form the light inlet 11. The first accommodating cavity 151 forms the first optical path channel 21. The second accommodating cavity 141 extends in the left-right direction, and one of its wall surfaces penetrates through the first housing 13. The second housing 16 is disposed on the right side of the first housing 13 and is connected to the first housing 13. The second housing 16 has a third accommodating cavity 161 that opens towards the first housing 13. The third accommodating cavity 161 communicates with the second accommodating cavity 141. An outlet 12 is provided on one wall surface of the third accommodating cavity 161 in the front-back direction or in the vertical direction, so that the outlet 12 and the corresponding side wall of the third accommodating cavity 161 jointly define the third optical path channel 23. The remaining part of the third accommodating cavity 161 and the second accommodating cavity 141 jointly form the second optical path channel 22. Among them, the first reflector 31 is disposed inside the first housing 13, and the second reflector 32 is disposed inside the second housing 16. With such an arrangement, the light path enters the first accommodating cavity 151 from the light inlet 11 on the lower wall surface of the first housing 13. After reaching the first reflector 31 inside the first housing 13, it is reflected and passes through the second accommodating cavity 141 to enter the third accommodating cavity 161. After reaching the second reflector 32 inside the second housing 16, it is reflected and then passes through the third accommodating cavity 161 and exits from the outlet 12.

[0047] It should be noted that the outlet 12 can be provided on one wall surface of the third accommodating cavity 161 in the front-back direction or on one wall surface of the third accommodating cavity 161 in the vertical direction.

[0048] In some embodiments, the light inlet 11 and the outlet 12 are staggered in the left-right direction, both extend in the vertical direction, and the light inlet 11 and the outlet 12 face the same direction or opposite directions. Specifically, when the outlet 12 is provided on the lower wall of the second housing 16, the light inlet 11 is provided on the lower wall of the mounting cylinder 15. At this time, the light inlet 11 and the outlet 12 face the same direction, and the direction of the light path entering the housing 1 from the light inlet 11 is opposite to the direction of the light path exiting the housing 1 from the outlet 12. When the outlet 12 is provided on the upper wall of the second housing 16, the light inlet 11 is provided on the lower wall of the mounting cylinder 15. At this time, the light inlet 11 and the outlet 12 face opposite directions, and the direction of the light path entering the housing 1 from the light inlet 11 is opposite to the direction of the light path exiting the housing 1 from the outlet 12.

[0049] In some other embodiments, the light incident port 11 and the light exit port 12 are staggeredly arranged in the left-right direction, the light incident port 11 extends in the up-down direction, and the light exit port 12 extends in the front-back direction. Specifically, when the light exit port 12 is arranged on the front wall or the rear wall of the second housing 16, the light exit port 12 extends in the front-back direction. It can be understood that, referring to Figure 2 , the optical path output by the light exit port 12 can also extend in a direction slightly deviating from the front-back direction.

[0050] It should be noted that the optical path arrangement in the above embodiments can be realized by the first reflector 31 and the second reflector 32. The second reflector 32 can be set as an aspherical reflector. In addition, by setting the installation direction of the second reflector 32 in the second housing 16, the optical path can be output from the light exit port 12.

[0051] The present invention does not limit the specific structure of the first housing 13. In one embodiment, the first housing 13 includes a mounting base 14 and a mounting cylinder 15. The left end wall 142 of the mounting base 14 is for mounting the first reflector 31. The mounting base 14 has the second accommodation cavity 141. The right end wall 143 of the mounting base 14 is connected to the second housing 16. The mounting cylinder 15 is arranged to penetrate in the up-down direction to form the first accommodation cavity 151. The lower port of the mounting cylinder 15 forms the light incident port 11. The upper end of the mounting cylinder 15 is connected to the lower side wall 144 of the mounting base 14.

[0052] The left end wall 142 of the mounting base 14 fixes the first reflector 31, and the right end wall 143 is connected to the second housing 16 to realize the docking between the left-right optical path channel 2 of the first housing 13 and the second housing 16. The vertically penetrating mounting cylinder 15 forms an independent first accommodation cavity 151. Its lower port serves as the light incident port 11 to realize unobstructed light introduction, and the upper end is connected to the lower side wall 144 of the mounting base 14 to form an up-down optical path transmission path. Such an arrangement not only avoids mutual interference of components, but also facilitates separate processing and assembly. In addition, the connection method between the mounting cylinder 15 and the mounting base 14 makes full use of the up-down space, and cooperates with the left-right extending mounting base 14 to realize multi-dimensional compact arrangement and reduce the volume occupied by the overall structure. Therefore, through the combined connection of the mounting base 14 and the mounting cylinder 15, the first housing 13 can strengthen space integration and assembly efficiency.

[0053] It should be noted that the mounting base 14 and the mounting cylinder 15 can be connected by screwing. Specifically, in one embodiment, a mounting wall extends circumferentially at the upper end of the mounting cylinder 15. The upper wall surface of the mounting cylinder 15 is fitted and adapted to the outer wall surface of the lower side wall 144 of the mounting base 14, and the mounting wall is screwed to the lower side wall 144 of the mounting base 14. Another mounting wall extends circumferentially at the lower end of the mounting cylinder 15 and can be connected to the projection optical machine.

[0054] To make the installation and disassembly of the first reflector 31 more convenient, please refer to Figure 3 , in one embodiment, the left end wall 142 of the mounting base 14 is inclined upward from left to right to form an inclined surface. An installation hole is provided in the inclined surface. The first reflector 31 is arranged outside the inclined surface, and the reflecting surface of the first reflector 31 corresponds to the installation hole. With this setting, the optical path can pass through the installation hole from the first optical path channel 21 to reach the reflecting surface of the first reflector 31, and after reflection, it is projected onto the second optical path channel 22; moreover, since the first reflector 31 is arranged outside the inclined surface, it is convenient to replace or disassemble.

[0055] In other embodiments, the first reflector 31 can be inclined and installed inside the left end wall 142 of the mounting base 14 through a fixing frame. This application will not elaborate here.

[0056] To further improve the stability of the first reflector 31, the first housing 13 further includes a reflector seat 17. The reflector seat 17 covers the installation hole. The side wall of the reflector seat 17 facing the installation hole is recessed inward to form a groove for accommodating the first reflector 31. By providing an independent reflector seat 17 and designing an inner groove structure, the precise positioning and stable encapsulation of the first reflector 31 are realized; after the reflector seat 17 covers the installation hole, the groove can closely fit the edge of the first reflector 31 to prevent the lens from shifting during installation or vibration; in addition, through the reflector seat 17, the installation and maintenance of the first reflector 31 can be independent of the mounting base 14, and other components do not need to be disturbed during disassembly, simplifying the replacement or calibration process. The reflector seat 17 covering the installation hole can block the installation hole from the external environment and reduce the risk of dust entering the optical path channel 2.

[0057] Furthermore, the mounting base 14 and the reflector seat 17 are screwed and fixed. The screwing and fixing method can provide a stable and reliable rigid connection through the mechanical locking effect of the threaded connection, improve the long-term structural stability between the mounting base 14 and the reflector seat 17, and avoid displacement caused by vibration or external force. Its detachable characteristic is convenient for installation, debugging and maintenance. At the same time, the progressive tightening of the thread can fine-tune the pressure distribution and reduce the interference of the assembly stress on the mirror surface shape, thereby ensuring the imaging quality and long-term stability of the optical system.

[0058] Referring to Figure 4 , a plurality of positioning holes 171 are further provided on the mirror base 17, and a plurality of positioning posts are correspondingly provided on the left end wall 142 of the mounting base 14. The plurality of positioning posts can be inserted into the plurality of positioning holes 171. The matching design of the positioning holes 171 and the positioning posts realizes the rapid and accurate pre-positioning of the mounting base 14 and the mirror base 17 through mechanical insertion, effectively preventing rotational deviation or misalignment during the assembly process.

[0059] Furthermore, the plurality of lenses include a front lens group and a rear lens group. The front lens group is arranged in the second optical path channel 22, and the rear lens group is arranged in the first optical path channel 21. By placing the front lens group and the rear lens group in the second and first optical path channels 21 respectively, the front lens group is installed in the second channel along the left-right direction, and the rear lens group is installed in the first channel along the up-down direction. The lens group is dispersed into different spatial dimensions by using the optical path turning, avoiding the dimensional redundancy in a single direction caused by the traditional single-axis stacking. The installation in different optical path channels 2 makes the installation positions of the lens groups relatively independent, which helps to reduce the risk of mechanical interference between groups.

[0060] The present invention also proposes a projection device, which includes the above-mentioned projector lens structure 1000. Since the projection device includes the projector lens structure 1000, the specific structure of this projector lens structure 1000 refers to the above-mentioned embodiments. Since the projector lens structure 1000 of this projection device adopts all the technical solutions of the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be elaborated here one by one.

[0061] The above are only exemplary embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. All equivalent structural transformations made under the technical concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A projector lens structure, characterized in that, The projector lens structure includes: A housing having a light inlet and a light outlet, the light inlet and the light outlet being arranged offset from each other. Inside the housing, three optically connected channels are formed, including a first optical channel, a second optical channel, and a third optical channel. The extending directions of every two adjacent optical channels intersect. The ports of the first optical channel and the third optical channel respectively form the light inlet and the light outlet. A lens assembly including a plurality of lenses distributed in the first optical channel and the second optical channel; and A mirror assembly disposed in at least part of the optical channels for changing the refraction direction of light after the light enters.

2. The projector lens structure according to claim 1, wherein, The two mirrors include a first mirror and a second mirror. The first mirror is obliquely placed at the connection of the first optical channel and the second optical channel, and the second mirror is placed at the connection of the second optical channel and the third optical channel. The reflecting surfaces of the first mirror and the second mirror are arranged opposite to each other.

3. The projector lens structure according to claim 2, characterized in that, The housing includes: A first housing with a chamber formed inside. The chamber includes a first accommodation cavity and a second accommodation cavity that are connected to each other. The first accommodation cavity extends in the up-down direction, and its lower wall penetrates through the first housing to form the light inlet. The first accommodation cavity forms the first optical channel. The second accommodation cavity extends in the left-right direction, and one of its walls penetrates through the first housing. A second housing disposed on the right side of the first housing and connected to the first housing. The second housing has a third accommodation cavity that opens towards the first housing. The third accommodation cavity is connected to the second accommodation cavity. An outlet is provided on one wall of the third accommodation cavity in the front-back direction or the up-down direction, so that the outlet and the corresponding side wall of the third accommodation cavity jointly define the third optical channel. The remaining part of the third accommodation cavity and the second accommodation cavity jointly form the second optical channel. Wherein, the first mirror is disposed in the first housing, and the second mirror is disposed in the second housing.

4. The projector lens structure according to claim 3, characterized in that The first housing includes: A mounting base, the left end wall of which is for mounting the first mirror. The mounting base has the second accommodation cavity, and the right end wall of the mounting base is connected to the second housing. A mounting cylinder that penetrates in the up-down direction to form the first accommodation cavity. The lower port of the mounting cylinder forms the light inlet, and the upper end of the mounting cylinder is connected to the lower side wall of the mounting base.

5. The projector lens structure according to claim 4, wherein, The left end wall of the mounting base is inclined upward from left to right to form an inclined surface, and a mounting hole is provided on the inclined surface. The reflecting surface of the first mirror corresponds to the mounting hole.

6. The projector lens structure according to claim 5, wherein, The first housing further includes a mirror base that covers the mounting hole. The side wall of the mirror base facing the mounting hole is recessed inward to form a groove for accommodating the first mirror.

7. The projector lens structure according to claim 4, characterized in that, The mounting base and the mirror base are screwed and fixed; and / or A plurality of positioning holes are further provided on the mirror base, and a plurality of positioning posts are correspondingly provided on the left end wall of the mounting base, and the plurality of positioning posts can be inserted into the plurality of positioning holes.

8. The projector lens structure according to claim 1, characterized in that, The light inlet and the light outlet are arranged offset in the left-right direction, both extending in the up-down direction, and the light inlet and the light outlet face the same direction or opposite directions; or, The light inlet and the light outlet are arranged offset in the left-right direction, the light inlet extends in the up-down direction, and the light outlet extends in the front-rear direction.

9. The projector lens structure according to claim 1, characterized in that, The plurality of lenses include a front lens group and a rear lens group, the front lens group is arranged in the second optical path channel, and the rear lens group is arranged in the first optical path channel.

10. A projection device, characterized in that, It includes the projector lens structure according to any one of claims 1 to 9.

Images