A focusing mechanism, a projection lens, and a projection device

Abstract

This application discloses a focusing mechanism, a projection lens, and a projection device. The focusing mechanism includes a fixed bracket, a driving component, a transmission component, a first signal feedback component, and a second signal feedback component. The driving component is mounted on the fixed bracket. The transmission component can reciprocate along a first direction under the driving action of the driving component to perform a focusing action. The first signal feedback component and the second signal feedback component are both disposed on the fixed bracket and located on both sides of the transmission component along the first direction. When the transmission component moves along the first direction to the first signal feedback component, the first signal feedback component sends a signal to the driving component to stop the transmission component at a first position. When the transmission component moves along the first direction to the second signal feedback component, the second signal feedback component sends a signal to the driving component to stop the transmission component at a second position. The first signal feedback component can move along the first direction on the fixed bracket to adjust the first position; and / or, the second signal feedback component can move along the first direction on the fixed bracket to adjust the second position.

Description

Technical Field

[0001] This application relates to the field of optical product technology, and more specifically, to a focusing mechanism, a projection lens, and a projection device. Background Technology

[0002] In micro-projection technology, the focusing distance of a projection lens comprises two parts: optical focusing distance and structural focusing tolerance redundancy. When the optical focusing distance in a projection system is short and accounts for a small proportion of the total focusing travel, most of the focusing time is ineffective in terms of achieving a clear image through optical focusing.

[0003] To reduce unnecessary focusing travel, the structural focusing tolerance redundancy can be reduced. However, setting too small a structural focusing tolerance redundancy will cause the actual accumulated structural tolerance to exceed the design value, resulting in insufficient focusing travel; for example, the focusing travel may be insufficient before the projected image is clear or reaches its optimal state.

[0004] To avoid insufficient focusing travel, design redundancy is needed to accumulate machining and assembly tolerances within the effective focusing range. However, increasing this redundancy results in a shorter optical focusing travel distance and a smaller proportion of the total focusing travel to the effective optical focusing travel. This leads to decreased focusing accuracy and consequently, a decline in projection image quality. Furthermore, if the effective optical focusing travel is too small within a larger focusing range, the user will spend a considerable amount of time focusing, resulting in a poor user experience.

[0005] In view of this, a new technical solution is needed to solve the above-mentioned technical problems. Summary of the Invention

[0006] One objective of this application is to provide a new technical solution for a focusing mechanism, a projection lens, and a projection device.

[0007] According to a first aspect of this application, a focusing mechanism is provided, the focusing mechanism comprising:

[0008] Fixed bracket;

[0009] A driving component, which is mounted on the fixed bracket;

[0010] A transmission component, which is connected to the driving component and can reciprocate along a first direction under the driving action of the driving component to perform a focusing action;

[0011] The first signal feedback element and the second signal feedback element are both disposed on the fixed bracket and located on both sides of the transmission element along the first direction;

[0012] The transmission component moves along the first direction to the first signal feedback component, and the first signal feedback component sends a signal to the drive component to stop the transmission component at the first position.

[0013] The transmission component moves along the first direction to the second signal feedback component, and the second signal feedback component sends a signal to the drive component to stop the transmission component at the second position.

[0014] The first signal feedback element can move along a first direction on the fixed bracket to adjust the first position; and / or, the second signal feedback element can move along a first direction on the fixed bracket to adjust the second position.

[0015] Optionally, the first signal feedback device includes a first adjustment bracket and a first signal switch, the first signal switch being disposed on the first adjustment bracket; the first adjustment bracket is mounted on the fixed bracket and has at least a first mounting position and a second mounting position, and the first mounting position and the second mounting position are spaced apart along a first direction.

[0016] Optionally, the first adjusting bracket has a first adjusting hole, which extends along a first direction; the first adjusting bracket is connected to the fixed bracket by a fastener passing through the first adjusting hole.

[0017] Optionally, the second signal feedback element includes a second adjustment bracket and a second signal switch, the second signal switch being disposed on the second adjustment bracket; the second adjustment bracket is mounted on the fixed bracket and has at least a third mounting position and a fourth mounting position, and the third mounting position and the fourth mounting position are spaced apart along a first direction.

[0018] Optionally, the second adjusting bracket has a second adjusting hole that extends along a first direction; the second adjusting bracket is connected to the fixed bracket by a fastener passing through the second adjusting hole.

[0019] Optionally, the fixed bracket includes a mounting part and a guide rail part, the driving component is mounted on the mounting part; the transmission component is movably disposed on the guide rail part, and the guide rail part extends along a first direction.

[0020] Optionally, the driving component includes a drive motor and gears, and the drive motor is mounted on the fixed bracket;

[0021] The transmission component is a rack; the gear is connected to the output shaft of the drive motor, and the gear meshes with the rack.

[0022] According to a second aspect of this application, a projection lens is provided, the projection lens including a focusing mechanism as described in the first aspect; the projection lens further includes a lens body, the lens body being connected to the transmission member, the transmission member being able to drive the lens body to move under the driving action of the driving member to focus the lens body.

[0023] Optionally, the projection lens further includes a lens sleeve, and the lens body portion is fitted inside the lens sleeve;

[0024] The lens body is provided with a connector; the lens sleeve has a guide groove that extends in the axial direction of the lens body; the connector is embedded in the guide groove and is connected to the transmission component.

[0025] According to a third aspect of this application, a projection device is provided, the projection device including a projection lens as described in the second aspect.

[0026] In the focusing mechanism provided in this application embodiment, the focusing stroke is insufficient due to the reduction of the redundancy of the focusing stroke required for the accumulation of processing tolerance and assembly tolerance by the first signal feedback element and / or the second signal feedback element, thereby ensuring that the projection focusing has sufficient focusing stroke to adjust to the optimal state.

[0027] Other features and advantages of this application will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0028] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of the present application and, together with their description, serve to explain the principles of the present application.

[0029] Figure 1 The diagram shown is a structural schematic of a focusing mechanism according to this application. Figure 1 ;

[0030] Figure 2 The diagram shown is a structural schematic of a focusing mechanism according to this application. Figure 2 ;

[0031] Figure 3a The diagram shown is a structural schematic of the first signal feedback element in a focusing mechanism according to this application. Figure 1 ;

[0032] Figure 3b The diagram shown is a structural schematic of the first signal feedback element in a focusing mechanism according to this application. Figure 2 ;

[0033] Figure 4a The diagram shown is a structural schematic of the second signal feedback element in a focusing mechanism according to this application. Figure 1 ;

[0034] Figure 4b The diagram shown is a structural schematic of the second signal feedback element in a focusing mechanism according to this application. Figure 2 ;

[0035] Figure 5 The diagram shown is a partial structural schematic of a projection lens according to this application.

[0036] Figure 6 The diagram shown illustrates the working principle of a projection lens according to this application.

[0037] Explanation of reference numerals in the attached figures:

[0038] 1. Focusing mechanism; 11. Fixed bracket; 111. Mounting part; 112. Guide rail part; 12. Driving component; 121. Drive motor; 122. Gear; 13. Transmission component; 14. First signal feedback component; 140. First adjusting bracket; 1400. First adjusting hole; 141. First signal switch; 1411. First switch body; 1412. First connector; 1413. First circuit board; 15. Second signal feedback component; 150. Second adjusting bracket; 1500. Second adjusting hole; 151. Second signal switch; 1511. Second switch body; 1512. Second connector; 1513. Second circuit board; 16. Bolt;

[0039] 2. Lens body; 20. Connector; 3. Lens sleeve; 30. Guide groove. Detailed Implementation

[0040] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present application.

[0041] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the scope of this application and its application or use.

[0042] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0043] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0044] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0045] Reference Figures 1-6 As shown, according to one embodiment of this application, a focusing mechanism 1 is provided. The focusing mechanism 1 includes a fixed bracket 11, a driving member 12, and a transmission member 13. The driving member 12 is mounted on the fixed bracket 11. The transmission member 13 is connected to the driving member 12 and can reciprocate along a first direction under the driving action of the driving member 12 to perform a focusing action.

[0046] The focusing mechanism 1 also includes a first signal feedback element 14 and a second signal feedback element 15. The first signal feedback element 14 and the second signal feedback element 15 are both disposed on the fixed bracket 11 and located on both sides of the transmission element 13 along the first direction.

[0047] The transmission component 13 moves along the first direction to the first signal feedback component 14, and the first signal feedback component 14 sends a signal to the driving component 12 to stop the transmission component 13 at the first position.

[0048] The transmission component 13 moves along the first direction to the second signal feedback component 15, and the second signal feedback component 15 sends a signal to the drive component 12 to stop the transmission component 13 at the second position.

[0049] The first signal feedback element 14 can move along a first direction on the fixed bracket 11 to adjust the first position; and / or, the second signal feedback element 15 can move along a first direction on the fixed bracket 11 to adjust the second position.

[0050] The focusing mechanism 1 provided in this embodiment is used in a projection lens to focus the lens body. The driving member 12 drives the transmission member 13 to reciprocate along a first direction, which in turn drives the lens body to move, thus focusing the lens body. The first direction is the circumferential direction around the axis of the lens body. Figure 2 In the direction of a.

[0051] Continue to refer to Figure 2 As shown, during the reciprocating motion of the transmission component 13 along the first direction, when the transmission component 13 moves to the position of the first signal feedback component 14, the first signal feedback component 14 sends a stop signal to the drive component 12. As a result, the drive component 12 stops driving the transmission component 13, and the transmission component 13 stops at the first position, that is, the transmission component 13 will not pass the first signal feedback component 14 and continue to move.

[0052] Similarly, when the transmission component 13 moves to the position of the second signal feedback component 15, the second signal feedback component 15 sends a stop signal to the drive component 12, so the drive component 12 stops driving the transmission component 13, and the transmission component 13 stops at the second position, that is, the transmission component 13 will not pass the second signal feedback component 15 to continue moving.

[0053] Therefore, the first signal feedback element 14 and the second signal feedback element 15 define two extreme positions of the movement of the transmission element 13, namely the first position and the second position mentioned above. Figure 2 The directions shown are described as follows: the first position corresponding to the first signal feedback element 14 is on the left, and the second position corresponding to the second signal feedback element 15 is on the right.

[0054] In the focusing mechanism 1 provided in this application embodiment, the installation positions of the first signal feedback element 14 and / or the second signal feedback element 15 on the fixed bracket 11 are not fixed, but can be adjusted according to actual needs.

[0055] For example, the mounting position of the first signal feedback element 14 on the fixed bracket 11 can be adjusted along the first direction; when the first signal feedback element 14 moves, the first position also moves accordingly; specifically, if the first signal feedback element 14 moves to the left, the first position also moves to the left accordingly.

[0056] Therefore, the movable first signal feedback element 14 provides the redundancy of the focusing stroke required to compensate for the accumulation of processing tolerances and assembly tolerances. Specifically, if the redundancy of the focusing stroke required for the accumulation of processing tolerances and assembly tolerances is reduced, resulting in insufficient focusing stroke, for example, if the focusing stroke has reached the leftmost position but still cannot achieve the optimal state of projection imaging, i.e., the accumulated errors of processing and assembly are shifted to the left, the first signal feedback element 14 is slid to the left by a certain distance to compensate for the insufficient left focusing stroke caused by the leftward shift of processing and assembly errors, ensuring that the projection focusing has sufficient focusing stroke to adjust to the optimal state.

[0057] Similarly, if the installation position of the second signal feedback element 15 on the fixed bracket 11 can be moved and adjusted along the first direction, then sliding the second signal feedback element 15 to the right by a certain distance can compensate for the insufficient right-side focusing stroke caused by the rightward deviation due to processing and assembly errors, ensuring that the projection focusing has sufficient focusing stroke to adjust to the optimal state.

[0058] If both the first signal feedback element 14 and the second signal feedback element 15 are configured to be able to move and adjust along the first direction on the fixed bracket 11, then compensation can be made regardless of whether the processing and assembly error is to the left or to the right, thereby avoiding the problem of insufficient focusing stroke.

[0059] Reference Figure 1 , Figure 2 As shown, in one embodiment, the first signal feedback element 14 includes a first adjustment bracket 140 and a first signal switch 141. The first signal switch 141 is disposed on the first adjustment bracket 140. The first adjustment bracket 140 is mounted on the fixed bracket 11 and has at least a first mounting position and a second mounting position, and the first mounting position and the second mounting position are spaced apart along a first direction.

[0060] In this specific example, the first signal switch 141 is mounted on the fixed bracket 11 via the first adjusting bracket 140 and has at least a first mounting position and a second mounting position, so as to achieve the purpose of adjusting the mounting position of the first signal feedback element 14 on the fixed bracket 11. For example, the first mounting position is further to the left than the second mounting position.

[0061] Reference Figure 3a , Figure 3b As shown, the first signal switch 141 includes a first switch body 1411, a first connector 1412, and a first circuit board 1413; wherein, the first switch body 1411 is an optocoupler switch.

[0062] Reference Figure 1 , Figure 2 As shown, in one embodiment, the first adjusting bracket 140 has a first adjusting hole 1400, which extends along a first direction; the first adjusting bracket 140 is connected to the fixed bracket 11 by a fastener passing through the first adjusting hole 1400.

[0063] In this specific example, the length of the first adjustment hole 1400 extending along the first direction is the adjustable range of the first signal feedback element 14 on the fixed bracket 11. Through the cooperation of the first adjustment hole 1400 and the fastener, the installation position of the first adjustment bracket 140 on the fixed bracket 11 can be easily and quickly adjusted. Optionally, the fastener is a bolt 16.

[0064] Reference Figure 1 , Figure 2 As shown, in one embodiment, the second signal feedback element 15 includes a second adjustment bracket 150 and a second signal switch 151, the second signal switch 151 being disposed on the second adjustment bracket 150; the second adjustment bracket 150 is mounted on the fixed bracket 11 and has at least a third mounting position and a fourth mounting position, and the third mounting position and the fourth mounting position are spaced apart along a first direction.

[0065] In this specific example, the second signal switch 151 is mounted on the fixed bracket 11 via the second adjusting bracket 150 and has at least a third mounting position and a fourth mounting position, so as to achieve the purpose of adjusting the mounting position of the second signal feedback element 15 on the fixed bracket 11. For example, the fourth mounting position is further to the right than the third mounting position.

[0066] Reference Figure 4a , Figure 4b As shown, the second signal switch 151 includes a second switch body 1511, a second connector 1512, and a second circuit board 1513; wherein, the second switch body 1511 is an optocoupler switch.

[0067] Reference Figure 1 , Figure 2 As shown, in one embodiment, the second adjusting bracket 150 has a second adjusting hole 1500, which extends along a first direction; the second adjusting bracket 150 is connected to the fixed bracket 11 by a fastener passing through the second adjusting hole 1500.

[0068] In this specific example, the length of the second adjustment hole 1500 extending along the first direction is the adjustable range of the second signal feedback element 15 on the fixed bracket 11. Through the cooperation of the second adjustment hole 1500 and the fastener, the installation position of the second adjustment bracket 150 on the fixed bracket 11 can be easily and quickly adjusted. Optionally, the fastener is a bolt 16.

[0069] Reference Figure 1 , Figure 2 As shown, in one embodiment, the fixed bracket 11 includes a mounting portion 111 and a guide rail portion 112, the driving member 12 is mounted on the mounting portion 111; the transmission member 13 is movably disposed on the guide rail portion 112, and the guide rail portion 112 extends along a first direction.

[0070] In this specific example, the mounting portion 111 of the fixed bracket 11 is used to mount the drive member 12. For example, the drive member 12 is mounted on the mounting portion 111 by bolts. The guide rail portion 112 is slidably connected to the transmission member 13 for the transmission member 13 to slide along a first direction.

[0071] As mentioned above, the first direction is the circumferential direction around the axis of the lens body, that is... Figure 2 The a direction in the middle; therefore, the shape of the guide rail 112, the shape of the first adjustment hole 1400 and the shape of the second adjustment hole 1500 are all arc-shaped.

[0072] Reference Figure 1 , Figure 2As shown, in one embodiment, the driving component 12 includes a driving motor 121 and a gear 122. The driving motor 121 is mounted on the fixed bracket 11. The transmission component 13 is a rack. The gear 122 is connected to the output shaft of the driving motor 121, and the gear 122 meshes with the rack.

[0073] In this specific example, the drive motor 121 drives the gear 122 to rotate, and the gear 122 in turn drives the rack meshing with it to reciprocate along the first direction.

[0074] When the rack moves to the position of the first signal feedback element 14, the first signal feedback element 14 sends a stop signal to the drive motor 121, so the drive motor 121 stops rotating until it receives a reverse signal and rotates in the opposite direction. Similarly, when the rack moves to the position of the second signal feedback element 15, the second signal feedback element 15 sends a stop signal to the drive motor 121, so the drive motor 121 stops rotating until it receives a reverse signal and rotates in the opposite direction.

[0075] Optionally, an alarm can be set to issue an alarm signal when the rack moves to the position of the first signal feedback element 14 and when the rack moves to the position of the second signal feedback element 15.

[0076] According to another embodiment of this application, a projection lens is provided, the projection lens including the focusing mechanism 1 as described above; refer to Figure 5 As shown, the projection lens also includes a lens body 2, which is connected to the transmission component 13. The transmission component 13 can drive the lens body 2 to move under the driving action of the driving component 12 to focus the lens body 2.

[0077] The projection lens provided in this application embodiment includes the above-mentioned focusing mechanism 1. During the focusing process of the lens body 2, the first signal feedback element 14 and / or the second signal feedback element 15 can compensate for the insufficient focusing stroke caused by the reduction of the focusing stroke redundancy required for the accumulation of processing tolerance and assembly tolerance, thereby ensuring that the projection focusing has sufficient focusing stroke to adjust to the optimal state.

[0078] Reference Figure 5 As shown, in one embodiment, the projection lens further includes a lens sleeve 3, and the lens body 2 is partially sleeved in the lens sleeve 3; the lens body 2 is provided with a connector 20; the lens sleeve 3 is provided with a guide groove 30, and the guide groove 30 extends in the axial direction of the lens body 2; the connector 20 is embedded in the guide groove 30 and the connector 20 is connected to the transmission member 13.

[0079] In this specific example, the connector 20 slides along the guide groove 30 under the drive of the transmission member 13; since the guide groove 30 extends in the axial direction of the lens body 2, the connector 20 can drive the lens body 2 to move a certain distance along the axial direction to achieve focusing of the lens body 2.

[0080] The following reference Figure 6 Detailed explanation of the focusing parameters of this projection lens:

[0081] The axial movement distance of the lens body 2 includes the effective optical focusing distance S1 required for optical focusing and the cumulative tolerance redundancy S2 caused by part manufacturing tolerances and assembly tolerances. If the effective optical focusing distance of the lens body 2 is short, when the cumulative part manufacturing tolerances and assembly tolerances are constant, the optical focusing distance S1 will account for a low proportion of the total focusing travel. Specifically, the proportion of the effective optical focusing distance in the total focusing travel = S1 / (S1+S2).

[0082] For the driving component 12 and the transmission component 13, let the step angle of the driving motor 121 be θ, the rotation frequency of the driving motor 121 be n, the reduction ratio of the gear system of the reduction gearbox of the driving motor 121 be i1, the number of teeth of the gear 122 be z1, and the number of teeth of the rack be z2. Then the reduction ratio of the gear system composed of the gear 122 and the rack is i2 = z1 / z2.

[0083] Reference Figure 6 As shown, by designing the guide groove 30 opened in the lens sleeve 3, the lens optical focusing distance S1 corresponds to the lens rotation angle θ1; the focusing stroke redundancy S2 required for the accumulation of part machining tolerances and assembly tolerances corresponds to the lens rotation angle θ2; therefore,

[0084] The focusing rotation angle φ of lens body 2 is (θ1+θ2);

[0085] The focusing time t of lens body 2 is (θ1+θ2) / (i1*i2*θ*n).

[0086] Therefore, the focusing time and focusing rotation angle of the lens body 2 are related to the reduction ratios i1 and i2, the step angle θ of the drive motor 121, and the rotation frequency n of the drive motor 121. Thus, once the drive motor and gear system are selected, the focusing time t can be reduced by decreasing the focusing rotation angle φ.

[0087] However, if the rotation angle θ2 corresponding to the part machining tolerance and assembly tolerance is directly reduced, the cumulative redundancy of the tolerance required by the structure will be insufficient, which will lead to insufficient focusing stroke. The phenomenon is that the connector 20 is already at the extreme position of the end point on both sides of the guide groove 30, but the image of the lens body 2 has not been adjusted to be clear or has not reached the best imaging state.

[0088] Therefore, in the projection lens provided in this application embodiment, the first signal feedback element 14 and / or the second signal feedback element 15 are configured to be adjustable according to actual needs to compensate for the tolerance redundancy of the reduction in rotation angle θ2.

[0089] Taking the first signal feedback element 14 as an example, its adjustment path is the same as the rotation path of the lens body 2 (both are in the first direction). Let the adjustable rotation angle of the first signal feedback element 14 be Δθ. The angle value of Δθ can be used to compensate for the rotation angle θ2 corresponding to the focus stroke redundancy required for the accumulation of lens part processing tolerance and assembly tolerance. That is, through the first signal feedback element 14, the rotation angle θ2 corresponding to the focus stroke redundancy required for the accumulation of lens part processing tolerance and assembly tolerance can be reduced by Δθ2, where Δθ2=θ2-2*Δθ; the focusing time t can then be reduced to t'=t-2*Δθ / (i1*i2*θ*n).

[0090] When the cumulative error of processing and assembly shifts to the left, the first signal feedback element 14 is slid to the left by a certain distance; when the cumulative error of processing and assembly shifts to the right, the second signal feedback element 15 is slid to the right by a certain distance.

[0091] In summary, the projection lens provided in this application can reduce the dependence on the processing accuracy and assembly accuracy of parts, and solve the problems of short optical focusing stroke and excessively long focusing time in projection systems; and solves the problem that the accumulation of processing tolerances and assembly tolerances of parts cannot be improved by existing conventional means to increase the effective optical focusing ratio.

[0092] In the projection lens provided in this application embodiment, by setting the first signal feedback element 14 and / or the second signal feedback element 15 as a movable focusing compensation structure, the requirements for the processing and manufacturing precision of focusing-related components can be reduced; through the focusing compensation structure, the proportion of effective optical focusing in the entire focusing process can be increased, and the focusing time can be reduced.

[0093] According to yet another embodiment of this application, a projection device is provided, the projection device including the projection lens as described above.

[0094] While specific embodiments of this application have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of this application. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of this application. The scope of this application is defined by the appended claims.

Claims

1. A focusing mechanism, characterized in that, The focusing mechanism includes: Fixed bracket (11); A driving component (12) is mounted on the fixed bracket (11); Transmission component (13), which is connected to the drive component (12) and can reciprocate along a first direction under the driving action of the drive component (12) to perform focusing action; The first signal feedback element (14) and the second signal feedback element (15) are both disposed on the fixed bracket (11) and located on both sides of the transmission element (13) along the first direction. The transmission component (13) moves along the first direction to the first signal feedback component (14), and the first signal feedback component (14) sends a signal to the drive component (12) to stop the transmission component (13) at the first position; The transmission component (13) moves along the first direction to the second signal feedback component (15), and the second signal feedback component (15) sends a signal to the drive component (12) to stop the transmission component (13) at the second position; The first signal feedback element (14) can move along a first direction on the fixed bracket (11) to adjust the first position; and / or, the second signal feedback element (15) can move along a first direction on the fixed bracket (11) to adjust the second position.

2. The focusing mechanism according to claim 1, characterized in that, The first signal feedback device (14) includes a first adjustment bracket (140) and a first signal switch (141). The first signal switch (141) is disposed on the first adjustment bracket (140). The first adjustment bracket (140) is mounted on the fixed bracket (11) and has at least a first mounting position and a second mounting position, and the first mounting position and the second mounting position are spaced apart along a first direction.

3. The focusing mechanism according to claim 2, characterized in that, The first adjusting bracket (140) has a first adjusting hole (1400), which extends along a first direction; the first adjusting bracket (140) is connected to the fixed bracket (11) by a fastener passing through the first adjusting hole (1400).

4. The focusing mechanism according to claim 1, characterized in that, The second signal feedback element (15) includes a second adjustment bracket (150) and a second signal switch (151). The second signal switch (151) is disposed on the second adjustment bracket (150). The second adjustment bracket (150) is mounted on the fixed bracket (11) and has at least a third mounting position and a fourth mounting position, and the third mounting position and the fourth mounting position are spaced apart along a first direction.

5. The focusing mechanism according to claim 4, characterized in that, The second adjusting bracket (150) has a second adjusting hole (1500), which extends along a first direction; the second adjusting bracket (150) is connected to the fixed bracket (11) by a fastener passing through the second adjusting hole (1500).

6. The focusing mechanism according to claim 1, characterized in that, The fixed bracket (11) includes a mounting part (111) and a guide rail part (112), the driving member (12) is mounted on the mounting part (111); the transmission member (13) is movably disposed on the guide rail part (112), and the guide rail part (112) extends along a first direction.

7. The focusing mechanism according to claim 1 or 6, characterized in that, The driving component (12) includes a drive motor (121) and a gear (122), and the drive motor (121) is mounted on the fixed bracket (11); The transmission component (13) is a rack; the gear (122) is connected to the output shaft of the drive motor (121), and the gear (122) meshes with the rack.

8. A projection lens, characterized in that, The projection lens includes a focusing mechanism (1) as described in any one of claims 1-7; the projection lens also includes a lens body (2), the lens body (2) being connected to the transmission member (13), the transmission member (13) being able to drive the lens body (2) to move under the driving action of the driving member (12) to focus the lens body (2).

9. The projection lens according to claim 8, characterized in that, The projection lens also includes a lens sleeve (3), and the lens body (2) is partially fitted inside the lens sleeve (3); The lens body (2) is provided with a connector (20); the lens sleeve (3) is provided with a guide groove (30), the guide groove (30) extends in the axial direction of the lens body (2); the connector (20) is embedded in the guide groove (30) and the connector (20) is connected to the transmission member (13).

10. A projection device, characterized in that, The projection device includes the projection lens as described in claim 8 or 9.

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