Stray light eliminating lens structure

Abstract

The utility model discloses a stray light eliminating lens structure, which comprises a shell, an incident window, a reflecting window and an emergent window are arranged on the shell, a DMD (Digital Micromirror Device) mounting seat is arranged at a position close to the reflecting window, a DMD chip is mounted in the DMD mounting seat, and a reflecting assembly and a stray light eliminating box are arranged in an inner cavity of the shell; one end of the stray light elimination box is connected with the shell, the other end of the stray light elimination box is hollowed out and extends towards an inner cavity of the shell, an inlet of the stray light elimination box corresponds to a stray light reflection path, stray light can enter the stray light elimination box and cannot be reflected again, and therefore the stability of the system is improved. The part used for eliminating the stray light does not need to be in contact with the box body, even if the part deforms, the shell cannot be affected, and therefore the device can stably operate for a long time.

Description

Technical Field

[0001] This utility model belongs to the field of optical lens technology, specifically a stray light reduction lens structure. Background Technology

[0002] The DMD chip is the foundation of DLP technology. DLP projection technology uses the DMD chip as the main key component to realize the digital optical processing. Stray light inevitably enters the projector housing. Therefore, existing technologies also have related structures to eliminate the influence of stray light on the system. For example, in the published technical document "CN206115130U, an optical engine system for a DLP projector", the non-effective optical areas on the upper and lower edge surfaces of the optical elements and the light-emitting surface of the TIR prism are provided with light-absorbing layers for absorbing stray light.

[0003] However, in addition to affecting imaging, these stray lights also carry energy. After being absorbed by the housing, they increase the heat of the entire housing. When the heat reaches a certain level, it may deform the housing and damage the entire optical system. Utility Model Content

[0004] The purpose of this invention is to provide a stray light reduction lens structure to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A stray light elimination lens structure includes a housing, an entrance window, a reflection window, and an exit window. A DMD mounting base is located near the reflection window, and a DMD chip is installed in the DMD mounting base. A reflection component and a stray light elimination box are located in the inner cavity of the housing.

[0007] One end of the stray light elimination box is connected to the shell, and the other end is hollowed out and extends into the inner cavity of the shell, with its entrance corresponding to the stray light reflection path.

[0008] In a further technical solution, the reflective window is formed on the fixed base, the fixed base is detachably connected to the housing, and the stray light elimination box is integrally formed with the fixed base.

[0009] In a further technical solution, the DMD mounting base is mounted on a fixed base, and an adjustment structure for adjusting the angle of the DMD mounting base is provided between the two.

[0010] A further technical solution includes an adjustment component installed at each corner of the DMD mounting base. The end of the adjustment component abuts against the fixed base and is used to adjust the distance between the DMD mounting base and the fixed base. It is fixed between the fixed base and the DMD mounting base by several fixing screws. Near each adjustment component, a tensioning component is provided between the DMD mounting base and the fixed base.

[0011] In a further technical solution, the adjustment component includes a nut seat fixed on the DMD mounting base, the nut seat being threadedly connected to an adjustment screw, one end of the adjustment screw passing through the nut seat and extending out of the DMD mounting base to abut against the fixed base.

[0012] In a further technical solution, the end of the adjusting screw away from the fixed seat is provided with a striped handle.

[0013] In a further technical solution, the tensioning assembly includes a tension spring placed between the DMD mounting base and the fixed base. The fixed base has a fixing rod one for connecting to one end of the tension spring, and the DMD mounting base has a fixing rod two for connecting to the other end of the tension spring.

[0014] In a further technical solution, the end face of the fixed seat is provided with a plurality of rolling elements corresponding to the position of the adjusting screw, and the end of the adjusting screw is hemispherical and placed between the plurality of rolling elements, and both are made of the same material.

[0015] In a further technical solution, the DMD mounting base is provided with a mounting position, which is larger than the area of ​​the DMD chip. Two inwardly extending spring arms are provided on two sides of the mounting position, and the two sides are arranged adjacent to each other.

[0016] The beneficial effects of this utility model are:

[0017] In this invention, the entrance of the stray light elimination box corresponds to the stray light reflection path, which allows these stray lights to enter the interior of the stray light elimination box without being reflected again, thereby improving the stability of the system. The part used to eliminate stray light does not need to contact the box body, so even if it deforms, it will not affect the shell, thus enabling the device to operate stably for a long time.

[0018] Other features and advantages of this invention will be described in detail in the following detailed description section. Attached Figure Description

[0019] Figure 1 : A three-dimensional structural diagram of this utility model.

[0020] Figure 2 Cross-sectional structure of this utility model Figure 1 .

[0021] Figure 3Cross-sectional structure of this utility model Figure 2 .

[0022] Figure 4 : Adjustment structure diagram of this utility model.

[0023] Figure 5 : A structural disassembly diagram of this utility model.

[0024] Figure 6 : A structural diagram of the spring arm of this utility model.

[0025] Reference numerals: 11-Fixed base, 12-DMD mounting base, 121-Mounting position, 122-Spring arm, 13-DMD chip, 14-Adjusting assembly, 141-Nut seat, 142-Adjusting screw, 143-Striped handle, 144-Rolling element, 15-Fixing screw, 16-Tensioning assembly, 161-Tension spring, 162-Fixing rod II, 21-Housing, 22-Entry window, 23-Exit window, 24-Reflection assembly, 25-Stray light elimination box, 26-Inlet. Detailed Implementation

[0026] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0027] Please refer to Figure 1-6 ;

[0028] The device described in this invention can effectively eliminate internal stray light and ensure long-term normal operation of the system. Specifically, it includes a housing 21, with an entrance window 22, a reflection window, and an exit window 23. A DMD mounting base 12 is located near the reflection window, and a DMD chip 13 is installed in the DMD mounting base 12. A reflection assembly 24 and a stray light elimination box 25 are located inside the housing 21. The working process involves light entering the housing 21 through the entrance window 22 and illuminating the DMD chip 13. The light is then reflected by the DMD chip 13 to the reflection assembly 24, and finally passes through the reflection assembly 25 again. Component 24 reflects the light, causing the light to exit from the exit window 23. During this process, stray light will enter the housing 21 along with the required light. The movement path of this stray light in the housing 21 is fixed. When it irradiates the DMD chip 13, its reflection path is also fixed. Therefore, the entrance 26 of the stray light elimination box 25 corresponds to the stray light reflection path, which allows this stray light to enter the interior of the stray light elimination box 25 without being reflected again, thereby improving the stability of the system. Preferably, a black light-absorbing coating can be provided on the inner wall of the stray light elimination box 25 to absorb this stray light.

[0029] Although the stray light elimination box 25 can remove stray light, it also absorbs the heat it carries along with the stray light. As the heat increases, the stray light elimination box 25 will deform and affect the optical device. Therefore, one end of the stray light elimination box 25 is connected to the housing 21, and the other end is hollowed out and extends into the inner cavity of the housing 21. The part used to eliminate stray light does not need to contact the box body. Even if it deforms, it will not affect the housing 21, so that the device can operate stably for a long time.

[0030] In this embodiment of the utility model, the reflective window is formed on the fixed base 11, the fixed base 11 is detachably connected to the housing 21, and the stray light elimination box 25 is integrally formed with the fixed base 11. Due to the difficulty of the manufacturing process, the integral forming of the stray light elimination box 25 and the fixed base 11 is easier to manufacture, and the detachable connection between the fixed base 11 and the housing 21 makes it easier to replace.

[0031] In this embodiment of the present invention, the DMD mounting base 12 is mounted on the fixed base 11, and an adjustment structure for adjusting the angle of the DMD mounting base 12 is provided between the two, so that the position of the DMD mounting base 12 can be finely adjusted by adjusting the structure.

[0032] Furthermore, adjustment components 14 are installed at each corner of the DMD mounting base 12. It should be noted that the shape of the DMD mounting base 12 varies depending on the actual installation situation. The most common shape is rectangular, so it has four corners, and adjustment components 14 are provided at each of the four corners. This design allows the DMD mounting base 12 to have more adjustment freedom and a wider adjustment range. The end of the adjustment component 14 abuts against the fixed base 11 and is located between the fixed base 11 and the DMD mounting base 12 and is fixed by several fixing screws 15.

[0033] Furthermore, the adjustment assembly 14 includes a nut seat 141 fixed on the DMD mounting base 12. The nut seat 141 is threadedly connected to an adjustment screw 142. One end of the adjustment screw 142 passes through the nut seat 141 and extends out of the DMD mounting base 12 to abut against the fixed base 11. At the position close to each adjustment assembly 14, a tensioning assembly 16 is provided between the DMD mounting base 12 and the fixed base 11.

[0034] First, the DMD chip 13 is fixed onto the DMD mounting base 12. Then, the DMD mounting base 12 and the fixed base 11 are locked together using several fixing screws 15. Preferably, the number of fixing screws 15 is the same as the number of adjusting components 14, and they are all located close to the adjusting components 14. In this state, the DMD mounting base 12 and the fixed base 11 are in a tight fit and have not been adjusted. When it is necessary to adjust the angle of the DMD chip 13, the fixing screws 15 need to be loosened first to allow the DMD mounting base 12 to move. However, due to the limitation of the tensioning component 16, even when the fixing screws 15 are loosened, the DMD mounting base 12 will still remain close to the fixed base. However, only an external force needs to be applied to the DMD mounting base 12 to make it move relative to the fixed base 11. Then, the four adjusting components 14 are adjusted individually according to the actual situation, more specifically by turning the adjusting screws 142. The DMD mounting base 12 can be positioned at different distances from the corners of the mounting base 11, thus achieving various tilt angles for the DMD chip 13 to meet different usage requirements. During adjustment, the presence of four tensioning components 16 that match the adjustment component 14 effectively limits the position of the DMD mounting base 12. Loosening the fixing screw 15 will not cause it to shift left or right, eliminating the need for realignment. After adjustment, the fixing screw 15 is tightened for fixation. Since the adjusted screw 142 has already defined the position between the DMD mounting base 12 and the fixing base 11, the distance between them will not change even after the fixing screw 15 is tightened. Furthermore, after tightening the fixing screw 15, there is no room for movement between the DMD mounting base 12 and the fixing base 11. Therefore, even external vibrations or other disturbances will not change the position between the DMD mounting base 12 and the fixing base 11, ensuring high stability.

[0035] It should be noted that the adjustment of the position of the DMD mounting base 12 by adjusting component 14 is only a fine adjustment, so it will not deviate too much from the fixing base 11. Therefore, the hole corresponding to the fixing screw 15 will not deviate too much, and the tightening and fixing effect can still be achieved. Alternatively, the through hole for the fixing screw 15 to pass through on the DMD mounting can be set to be larger, so that the fixing screw 15 can also be finely adjusted according to the specific position.

[0036] In this embodiment of the present invention, the end face of the fixed base 11 is provided with a plurality of rolling elements 144 corresponding to the position of the adjusting screw 142. These rolling elements 144 can be horizontally placed cylinders or spheres. The end of the adjusting screw 142 is hemispherical and is placed among the rolling elements 144, and both are made of the same material. After the DMD mounting base 12 and the fixed base 11 are adjusted, there will be a gap between them. During the rotation of the adjusting screw 142, friction will be generated and metal shavings will be produced. These metal shavings will fall into the projection box and affect the reflection. In this embodiment, when the adjusting screw 142 is rotated, it will generate slight rolling friction with the rolling elements 144, and the contact area is small, which greatly reduces the friction. Moreover, since both are made of the same material, the generation of metal shavings is greatly reduced.

[0037] In this embodiment of the present invention, the adjusting screw 142 can be turned by using an external tool, such as a hex wrench, or the end of the adjusting screw 142 away from the fixed base 11 is provided with a striped handle 143, so that the position of the adjusting screw 142 can be directly adjusted by pinching the striped handle 143.

[0038] In one embodiment of the tensioning assembly 16 of this utility model, a tension spring 161 is specifically placed between the DMD mounting base 12 and the fixed base 11. More specifically, a channel for accommodating the tension spring 161 is formed between the DMD mounting base 12 and the fixed base 11, so that the tension spring 161 will not affect the space between the DMD mounting base 12 and the fixed base 11. The fixed base 11 is provided with a fixing rod 1 for connecting to one end of the tension spring 161, and the DMD mounting base 12 is provided with a fixing rod 2 162 for connecting to the other end of the tension spring 161.

[0039] In this embodiment of the present invention, the DMD mounting base 12 is provided with a mounting position 121, which is larger than the area of ​​the DMD chip 13. Two inwardly extending spring arms 122 are provided on two sides of the mounting position 121, and the two sides are arranged adjacent to each other. For example, if the mounting position 121 is square, then one spring arm 122 is located on the bottom side and the other spring arm 122 is located on the side. When the DMD chip 13 enters the mounting position 121, the two spring arms 122 push the DMD chip 13 towards the other two spring arms 122 and bring them closer together to make up for the tolerance between the parts and prevent shaking.

[0040] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0041] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A stray light reduction lens structure, characterized in that: Includes a housing (21), which has an entrance window (22), a reflection window and an exit window (23). A DMD mounting base (12) is provided near the reflection window. A DMD chip (13) is installed in the DMD mounting base (12). A reflection component (24) and a stray light elimination box (25) are provided in the inner cavity of the housing (21). One end of the stray light elimination box (25) is connected to the shell (21), and the other end is hollowed out and extends into the inner cavity of the shell (21), with its entrance (26) corresponding to the stray light reflection path.

2. The stray light reduction lens structure according to claim 1, characterized in that: The reflective window is formed on the mounting base (11), the mounting base (11) is detachably connected to the housing (21), and the stray light elimination box (25) is integrally formed with the mounting base (11).

3. The stray light reduction lens structure according to claim 2, characterized in that: The DMD mounting base (12) is mounted on the fixed base (11), and an adjustment structure for adjusting the angle of the DMD mounting base (12) is provided between the two.

4. The stray light reduction lens structure according to claim 3, characterized in that: The adjustment structure includes an adjustment component (14) installed at each corner of the DMD mounting base (12). The end of the adjustment component (14) abuts against the fixed base (11) and is used to adjust the distance between the DMD mounting base (12) and the fixed base (11). It is fixed between the fixed base (11) and the DMD mounting base (12) by a number of fixing screws (15). Near each adjustment component (14), a tensioning component (16) is provided between the DMD mounting base (12) and the fixed base (11).

5. The stray light reduction lens structure according to claim 4, characterized in that: The adjustment assembly (14) includes a nut seat (141) fixed on the DMD mounting base (12), the nut seat (141) being threadedly connected to an adjustment screw (142), one end of the adjustment screw (142) passing through the nut seat (141) and extending out of the DMD mounting base (12) to abut against the fixed base (11).

6. The stray light reduction lens structure according to claim 5, characterized in that: The adjusting screw (142) has a striped handle (143) at the end away from the fixed seat (11).

7. The stray light reduction lens structure according to claim 4, characterized in that: The tensioning assembly (16) includes a tension spring (161) placed between the DMD mounting base (12) and the fixed base (11). The fixed base (11) is provided with a fixing rod one for connecting to one end of the tension spring (161), and the DMD mounting base (12) is provided with a fixing rod two (162) for connecting to the other end of the tension spring (161).

8. The stray light reduction lens structure according to claim 5, characterized in that: The fixed base (11) has several rolling elements (144) on its end face corresponding to the position of the adjusting screw (142). The end of the adjusting screw (142) is hemispherical and is placed between the rolling elements (144), and both are made of the same material.

9. The stray light reduction lens structure according to claim 1, characterized in that: The DMD mounting base (12) is provided with a mounting position (121), which is larger than the area of ​​the DMD chip (13). Two inwardly extending spring arms (122) are provided on two sides of the mounting position (121), and the two sides are arranged adjacent to each other.

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