Projection lens and projector

Abstract

The application discloses a projection lens and a projector. The projection lens comprises a lens barrel, a lens optical group and a zoom detection assembly. The lens optical group is located in the lens barrel. The lens optical group has a first optical axis. The lens optical group comprises a zoom lens group. The zoom lens group can move along the extension direction of the first optical axis relative to the lens barrel. The zoom detection assembly comprises a zoom moving part and a zoom detection part. One of the zoom moving part and the zoom detection part is connected to the zoom lens group to move the zoom lens group. The other is fixedly arranged relative to the lens barrel. The zoom detection part is used for cooperating with the zoom moving part to detect the moving distance of the zoom lens group relative to the lens barrel. The embodiment can improve the accuracy of the zoom function of the lens.

Description

Technical Field

[0001] This application relates to the field of projection equipment technology, and in particular to a projection lens and a projector. Background Technology

[0002] Projectors serve as office equipment, suitable for impromptu meetings, technical lectures, network centers, and command and control centers. They can also connect to computers, workstations, video recorders, televisions, DVD players, and document cameras, making them a widely used large-screen imaging device. However, current projection technologies struggle to improve the accuracy of fixed-focus or zoom functions. Summary of the Invention

[0003] This application provides a projection lens and a projector that can improve the accuracy of focusing and / or zooming of the projection lens.

[0004] In a first aspect, embodiments of this application provide a projection lens, including:

[0005] Lens tube;

[0006] The lens optical group is located inside the lens barrel. The lens optical group has a first optical axis and includes a zoom lens group that is movable relative to the lens barrel along the extension direction of the first optical axis.

[0007] A zoom detection component includes a zoom motion component and a zoom detection component. One of the zoom motion component and the zoom detection component is connected to the zoom lens group to move and zoom with the zoom lens group, and the other is fixedly disposed relative to the lens barrel. The zoom detection component is used to cooperate with the zoom motion component to detect the movement distance of the zoom lens group relative to the lens barrel.

[0008] Secondly, embodiments of this application provide a projection lens, including:

[0009] Lens tube;

[0010] The lens optical group is located inside the lens barrel. The lens optical group has a first optical axis and includes a zoom lens group and a focusing lens group arranged along the extension direction of the first optical axis. Both the zoom lens group and the focusing lens group are capable of sliding relative to the lens barrel along the extension direction of the first optical axis.

[0011] A zoom detection component includes a zoom motion component and a zoom detection component. One of the zoom motion component and the zoom detection component is connected to the zoom lens group to move and zoom with the zoom lens group, and the other is fixedly disposed relative to the lens barrel. The zoom detection component is used to cooperate with the zoom motion component to detect the movement distance of the zoom lens group relative to the lens barrel.

[0012] The focus detection assembly includes a focus motion component and a focus detection component. One of the focus motion component and the focus detection component is connected to the focus lens group to follow the movement of the focus lens group for focusing, while the other is fixedly disposed relative to the lens barrel. The focus detection component is used to cooperate with the focus motion component to detect the movement distance of the focus lens group relative to the lens barrel.

[0013] Thirdly, this application also provides a projector, which includes an optical engine and a projection lens as described in any of the above embodiments. The projection lens is connected to the optical engine, and the light source of the optical engine is projected onto an external projection plane through the projection lens.

[0014] Based on the projection lens and projector in this application embodiment, this embodiment sets one of a zoom motion component and a zoom detection component on the zoom lens group, and sets the other of the zoom motion component and zoom detection component on the fixed lens group. Simultaneously, one of a focusing motion component and a focusing detection component is set on the focusing lens group, and the other of the focusing motion component and focusing detection component is set on the fixed lens group. When the projection lens is focusing and / or zooming, the zoom detection component and the zoom motion component work together to detect the movement distance required for the projection lens to focus, and the focusing detection component and the focusing motion component work together to detect the movement distance required for the projection lens to zoom. This allows the zoom lens group and the focusing lens group to be directly driven to the desired adjustment position, thereby realizing the focusing and zooming functions of the projection lens. By setting zoom detection components and focusing detection components on different lens groups, this embodiment can shorten the time required for the projection lens to focus and / or zoom, and improve the accuracy of the projection lens's focusing and / or zooming. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the lens structure in one embodiment of this application;

[0017] Figure 2 This is a schematic diagram of the structure of the lens optical assembly in one embodiment of this application.

[0018] Figure label:

[0019] 1. Projection lens;

[0020] 10. Lens tube; 11. Curved groove;

[0021] 20. Lens optical group; 21. Focusing lens group; 22. Zoom lens group; 221. First lens group; 222. Second lens group; 223. Third lens group; 224. Fourth lens group; L1. First lens; L2. Second lens; L3. Third lens; L4. Fourth lens; L5. Fifth lens; L6. Sixth lens; L7. Seventh lens; STO. Aperture stop; 23. Fixed lens group;

[0022] 30. Focus detection component;

[0023] 40. Zoom detection component;

[0024] 51. First transmission component; 52. Second transmission component;

[0025] H, the first optical axis. Detailed Implementation

[0026] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, a clear and complete description will be provided below with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0027] In related technologies, projector lenses are usually equipped with position sensors that can move along the optical axis to detect the amount of forward and backward displacement of the projector lens, thereby enabling the lens to focus or zoom. However, the displacement of the projector lens is relatively small, so it is particularly important to reduce the errors generated by the projector when focusing and zooming.

[0028] Regarding the above situation, firstly, please refer to [link / reference needed]. Figures 1-2 This application proposes a projection lens 1, including a lens barrel 10, a lens optical group 20, and a zoom detection component 40.

[0029] The lens optical group 20 is located inside the lens barrel 10. The lens optical group 20 has a first optical axis H and includes a zoom lens group 22. The zoom lens group 22 can slide relative to the lens barrel 10 along the extension direction of the first optical axis H. The zoom detection component 40 includes a zoom motion component and a zoom detection component (not shown separately in the figure). One of the zoom motion component and the zoom detection component is connected to the zoom lens group 22 to follow the zoom lens group 22 to move and zoom. The other is fixed relative to the lens barrel 10. The zoom detection component is used to cooperate with the zoom motion component to detect the movement distance of the zoom lens group 22 relative to the lens barrel 10.

[0030] Specifically, the lens barrel 10 provides mounting space for the lens optical assembly 20. The zoom lens assembly 22 may include a lens mount and one or more lenses. The lenses are mounted on the lens mount, and the lens mount is slidably connected to the lens barrel 10 along the extension direction of the first optical axis H, thereby causing the lenses to slide along the extension direction of the first optical axis H. The lens barrel 10 has a front side and a rear side. The distance between the front side of the lens barrel 10 and the object to be photographed is smaller, and the distance between the rear side of the lens barrel 10 and the object to be photographed is larger. The zoom lens assembly 22 can serve as the zoom assembly of the projection lens 1 and is located in the middle of the lens barrel 10. The zoom lens assembly 22 changes the focal length of the projection lens 1 by moving, thereby causing a change in the viewing angle or image size, and obtaining the effect of zooming in or out.

[0031] It should be noted that in this embodiment, one of a zoom motion component and a zoom detection component is provided on the zoom lens group 22, and the other of the zoom motion component and zoom detection component is fixedly provided on the lens barrel 10. When the projection lens 1 is zooming, the zoom motion component and the zoom detection component work together to detect the moving distance required for the projection lens 1 to zoom, thereby directly driving the zoom lens group 22 to the required adjustment position, thus realizing the zoom function of the projection lens 1. By providing the zoom detection component 40 on different optical components, this embodiment can shorten the time required for the projection lens 1 to zoom and improve the accuracy of the zoom of the projection lens 1.

[0032] Please see Figure 1 In some embodiments of this application, the lens optical assembly 20 further includes a fixed lens assembly 23 fixed to the lens barrel 10. The fixed lens assembly 23 and the zoom lens assembly 22 are arranged along the extension direction of the first optical axis H. One of the zoom motion component and the zoom detection component is connected to the zoom lens assembly 22, and the other is connected to the fixed lens assembly 23. The zoom detection component is used to cooperate with the zoom motion component to detect the distance between the zoom lens assembly 22 and the fixed lens assembly 23.

[0033] Specifically, the fixed lens group 23 can provide a base for setting up either the zoom movement component or the zoom detection component. Located at the rear of the lens barrel 10, the fixed lens group 23 provides a basic optical power for the lens optics group 20, and since it remains stationary, it also provides a reference for the movement of the zoom lens group 22.

[0034] In some embodiments of this application, the zoom detection element is a first magnet, and the zoom motion element is a first sensor. The first sensor is used to sense the magnetic signal of the first magnet in order to detect the distance between the zoom lens group 22 and the fixed lens group 23.

[0035] Specifically, the first sensor can sense the magnetic field strength of the first magnet. According to the principle of magnetic field attenuation over distance, the magnetic field strength sensed by the first sensor is different when the first magnet and the first sensor are in different relative positions. One of the first magnet and the first sensor will move along the extension direction of the first optical axis H with the zoom lens group 22. The other of the first magnet and the first sensor is fixed at the position of the fixed lens group 23. At this time, a mapping relationship can be established between the position of the fixed lens group 23 and the magnetic field strength sensed by the first sensor.

[0036] For example, when the position of the first magnet moves, the magnetic field of the first magnet moves accordingly. At this time, the magnetic field strength sensed by the first sensor changes. The zoom lens group 22 in the projection lens 1 can then be directly driven to move to the position of the preset magnetic field strength sensed by the first sensor, thereby completing the zoom process of the projection lens 1 and capturing a clear image. Preferably, the first sensor is a tunnel magnetoresistive (TMR) sensor. TMR sensors have better temperature stability, higher sensitivity, lower power consumption, and better linearity. Therefore, the application of a TMR sensor further optimizes the zoom performance of the projection lens 1.

[0037] Furthermore, in some embodiments, the first magnet is a magnetic strip, that is, the first magnet is composed of multiple magnetic blocks connected end to end. The first magnet has multiple N poles and multiple S poles, which are alternately arranged along the extension direction of the first optical axis H. This makes the magnetic field generated by the first magnet a periodic sine wave. By sensing this periodically changing magnetic field, the first sensor can more accurately measure the distance between the zoom lens group 22 and the fixed lens group 23, and can also effectively reduce external interference, thereby improving the zoom accuracy and stability of the projection lens 1. Through this periodic sine wave magnetic field, the first sensor can not only accurately measure the distance, ensuring the stability and accuracy during the zoom process, but also the first magnet can maintain high sensitivity in complex environments, reducing errors, so that the projection lens 1 can present a clear image at different focal lengths, significantly improving the imaging quality of the projection lens 1.

[0038] In some embodiments of this application, such as Figure 1 As shown, the projection lens 1 also includes a first transmission component 51, which is movably connected to the lens barrel 10 and is also connected to the zoom lens group 22. The first transmission component 51 is used to drive the zoom lens group 22 to slide along the extension direction of the first optical axis H.

[0039] In some embodiments, the first transmission member 51 may be a stepper motor to achieve fine zooming of the zoom lens group 22. For example, the first transmission member 51 is a zoom barrel, which is rotatably connected to the lens barrel 10. The zoom barrel can drive the zoom lens group 22 to slide along the extension direction of the first optical axis H by rotating, thereby realizing independent control of the zoom of the projection lens 1.

[0040] Furthermore, in some embodiments of this application, the projection lens 1 further includes a driving component (not shown in the figure) disposed on the lens barrel 10. The driving component is electrically connected to the first sensor. The driving component is used to receive the detection signal of the first sensor and drive the first transmission member 51 to drive the zoom lens group 22 to slide along the extension direction of the first optical axis H.

[0041] Specifically, the drive component has a built-in microprocessor that can process the detection data of the first sensor in real time, thereby optimizing the movement trajectory of the zoom lens group 22 and ensuring the accurate positioning of the zoom lens group 22, thereby improving the imaging quality of the projection lens 1. Through the coordinated work of the drive component and the first sensor, the automatic zoom operation of the projection lens 1 is realized, ensuring that it can respond quickly in various shooting environments and capture clear images in order to meet the shooting needs of high dynamic range.

[0042] Please see Figure 1In some embodiments of this application, the zoom motion component is connected to the zoom lens group 22, and the zoom detection component is fixedly disposed relative to the lens barrel 10; the lens barrel 10 is provided with a curved groove 11, and the zoom motion component slides within the curved groove 11 along the extension direction of the first optical axis H. It is easy to understand that the curved groove 11 can guide the zoom motion component, facilitating precise movement of the zoom motion component along a preset curved trajectory within the curved groove 11, ensuring that the imaging quality of the projection lens 1 is not affected during the zooming process.

[0043] In some embodiments of this application, the maximum sliding distance of the zoom lens group 22 along the extension direction of the first optical axis H is greater than 30 mm.

[0044] Specifically, during the zooming process of the zoom lens group 22, the zoom motion component and the zoom detection component can detect the displacement change of the zoom lens group 22 and provide real-time feedback on the data required for the zooming of the projection lens 1. For example, the zoom motion component is set on the zoom lens group 22, and the zoom detection component is set on the fixed lens group 23. During the zooming process of the projection lens 1, since the maximum sliding distance of the zoom lens group 22 is large, the displacement of the zoom motion component is also large. This reduces the error generated by the zoom detection component when detecting the displacement of the zoom motion component, ensures data accuracy, optimizes zoom accuracy, improves image quality, and meets the high requirements of complex shooting environments.

[0045] It should be noted that in some embodiments, such as Figure 2 As shown, the zoom lens group 22 includes a first lens group 221, a second lens group 222, a third lens group 223 and a fourth lens group 224 arranged sequentially along the extension direction of the first optical axis H. The first lens group 221, the second lens group 222, the third lens group 223 and the fourth lens group 224 are all slidably connected to the lens barrel 10, and the sliding distance between the four lens groups can be different.

[0046] Specifically, the zoom lens group 22 can serve as the zoom group of the projection lens 1. This zoom group adopts a four-group linkage design. By finely adjusting the spacing and position of the first lens group 221 to the fourth lens group 224, the light refraction path is precisely controlled to achieve multi-level zoom, ensuring the optimization of optical performance at different focal lengths. The four lens groups work together to correct primary and advanced aberrations, reduce chromatic aberration and distortion, ensure rich image details, and further improve the overall imaging effect of the projection lens 1. At the same time, through the coordinated optimization of the four lens groups, the projection ratio of the projection lens 1 can be changed and miniaturized.

[0047] Furthermore, such as Figure 2As shown, the fourth lens group 224 includes seven lenses with optical power. The seven lenses are arranged sequentially along the extension direction of the first optical axis H as the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the seventh lens L7. The first lens L1 and the second lens L2 are cemented together, and the fourth lens L4, the fifth lens L5, and the sixth lens L6 are cemented together. It is easy to understand that the seven lenses in the fourth lens group 224 are arranged in a 2:1:3:1 ratio, which can correct chromatic aberration.

[0048] The materials of the first lens L1 to the seventh lens L7 can be plastic or glass. For example, the first lens L1 to the seventh lens L7 can be plastic lenses. Using plastic lenses can not only effectively reduce the aberrations of the zoom lens group 22 and reduce the length of the zoom lens group 22, but also make the overall weight of the zoom lens group 22 lighter. For example, at least one lens in the lens optical group 20 can be made of plastic (PC), such as polycarbonate or resin; or, at least one lens in the lens optical group 20 can be made of glass (GL); or, the lens optical group 20 can be equipped with lenses of different materials, that is, a design combining glass lenses and plastic lenses can be adopted. Lenses made of plastic materials can reduce the production cost of the lens optical group 20, while lenses made of glass materials can withstand higher or lower temperatures and have excellent optical effects and better stability. The specific configuration relationship of lenses of different materials can be determined according to actual needs, and will not be exhaustively listed here.

[0049] Furthermore, in some embodiments of this application, the maximum sliding distance of the first lens group 221 along the extension direction of the first optical axis H is greater than 5 mm; the maximum sliding distance of the second lens group 222 along the extension direction of the first optical axis H is greater than 5 mm; the maximum sliding distance of the third lens group 223 along the extension direction of the first optical axis H is greater than 30 mm; and the maximum sliding distance of the fourth lens group 224 along the extension direction of the first optical axis H is greater than 10 mm. Limiting the maximum sliding distance of each lens group allows for precise setting of the sliding distance of each lens group, improving the smoothness of the zoom process of the projection lens 1 and ensuring the stable performance of the projection lens 1 at different focal lengths.

[0050] Furthermore, one of the zoom motion component and the zoom detection component is disposed in the third lens group, and the other of the zoom motion component and the zoom detection component is fixedly disposed relative to the lens barrel 10. It is easy to understand that if the maximum sliding distance of the third lens group 223 along the extension direction of the first optical axis H is greater than 30mm, then the motion distance sensed by the zoom detection component 40 is also greater than 30mm.

[0051] Specifically, during the zooming process of the zoom lens group 22, the zoom motion component and the zoom detection component can detect the displacement change of the third lens group 223 and provide real-time feedback on the data required for the zooming of the projection lens 1. For example, the zoom motion component is set in the third lens group 223, and the zoom detection component is set in the fixed lens group 23. During the zooming process of the projection lens 1, since the maximum sliding distance of the third lens group 223 is relatively large, the displacement of the zoom motion component is also relatively large. This reduces the error generated by the zoom detection component when detecting the displacement of the zoom motion component, ensures data accuracy, optimizes zoom accuracy, improves image quality, and meets the high requirements of complex shooting environments.

[0052] Furthermore, such as Figure 2 As shown, the zoom lens group 22 also includes an aperture stop STO, which is set in the third lens group 223 to control the amount of light and depth of field, and to correct off-axis aberrations (such as coma, astigmatism, etc.) to improve image quality.

[0053] Secondly, please see Figures 1-2 This application proposes a projection lens 1, including a lens barrel 10, a lens optical group 20, a focus detection component 30, and a zoom detection component 40.

[0054] The lens optical group 20 is located inside the lens barrel 10. The lens optical group 20 has a first optical axis H. The lens optical group 20 includes a focusing lens group 21 and a zoom lens group 22 arranged sequentially along the extension direction of the first optical axis H. Both the focusing lens group 21 and the zoom lens group 22 can slide relative to the lens barrel 10 along the extension direction of the first optical axis H. The zoom detection assembly 40 includes a zoom motion component and a zoom detection component (not shown separately in the figure). One of the zoom motion component and the zoom detection component is disposed in the zoom lens group 22. The other component is fixedly disposed relative to the lens barrel 10. The zoom detection component is used to cooperate with the zoom movement component to detect the movement distance of the zoom lens group 22 relative to the lens barrel 10. The focus detection component 30 includes a focus movement component and a focus detection component (not shown separately in the figure). One of the focus movement component and the focus detection component is disposed on the focusing lens group 21, and the other of the focus movement component and the focus detection component is fixedly disposed relative to the lens barrel 10. The focus detection component is used to cooperate with the focus movement component to detect the movement distance of the focusing lens group 21 relative to the lens barrel 10.

[0055] Specifically, the lens barrel 10 provides mounting space for the lens optical assembly 20. Both the focusing lens assembly 21 and the zoom lens assembly 22 can include a lens mount and one or more lenses. The lenses are mounted on the lens mount, and the lens mount is slidably connected to the lens barrel 10 along the extension direction of the first optical axis H, thereby causing the lenses to slide along the extension direction of the first optical axis H. The lens barrel 10 has a front side and a rear side. The distance between the front side of the lens barrel 10 and the object to be photographed is smaller, while the distance between the rear side of the lens barrel 10 and the object to be photographed is larger. The focusing lens assembly 21 can serve as the focusing group of the projection lens 1, located on the front side of the lens barrel 10, to facilitate adjustment of its position relative to the object distance, resulting in a clearer image. Furthermore, the focusing lens assembly 21 can also be used to correct distortion and improve the image quality of the projected image. The zoom lens group 22 can serve as the zoom group of the projection lens 1. It is located between the focusing lens group 21 and the fixed lens group 23, that is, in the middle of the lens barrel 10. The zoom lens group 22 changes the focal length of the projection lens 1 by moving, thereby causing a change in the viewing angle or image size, and obtaining the effect of zooming in or out.

[0056] It should be noted that in this embodiment, one of a zoom motion component and a zoom detection component is provided on the zoom lens group 22, and the other of the zoom motion component and zoom detection component is fixedly provided relative to the lens barrel 10. Simultaneously, one of a focusing motion component and a focusing detection component is provided on the focusing lens group 21, and the other of the focusing motion component and focusing detection component is fixedly provided relative to the lens barrel 10. During the focusing and zooming process of the projection lens 1, the focusing motion component and the focusing detection component work together to detect the movement distance required for the projection lens 1 to focus, and the zoom motion component and the zoom detection component work together to detect the movement distance required for the projection lens 1 to zoom. This allows the focusing lens group 21 and the zoom lens group 22 to be directly driven to the desired adjustment position, thereby realizing the focusing and zooming functions of the projection lens 1. This embodiment, by providing the focusing detection component 30 and the zoom detection component 40 on different optical components, can shorten the time required for the projection lens 1 to focus and zoom, and improve the accuracy of the focusing and zooming of the projection lens 1.

[0057] Please see Figure 1In some embodiments of this application, the lens optical assembly 20 further includes a fixed lens assembly 23 fixed to the lens barrel 10. The focusing lens assembly 21, the zoom lens assembly 22, and the fixed lens assembly 23 are arranged sequentially along the extension direction of the first optical axis H. One of the zoom motion component and the zoom detection component is connected to the zoom lens assembly 22, and the other is connected to the fixed lens assembly 23. The zoom detection component cooperates with the zoom motion component to detect the distance between the zoom lens assembly 22 and the fixed lens assembly 23. Similarly, one of the focusing motion component and the focusing detection component is connected to the focusing lens assembly 21, and the other is connected to the fixed lens assembly 23. The focusing detection component cooperates with the focusing motion component to detect the distance between the focusing lens assembly 21 and the fixed lens assembly 23.

[0058] Specifically, the fixed lens group 23 can provide a base for setting up part of the zoom detection assembly 40 and part of the focus detection assembly 30. The fixed lens group 23 is located on the rear side of the lens barrel 10, which can provide a basic optical power for the lens optical group 20. The fixed lens group 23 remains fixed and can also provide a reference for the movement of the zoom lens group 22 and the focus lens group 21.

[0059] In some embodiments of this application, the zoom detection element is a first magnet, and the zoom motion element is a first sensor. The first sensor is used to sense the magnetic signal of the first magnet to detect the distance between the zoom lens group 22 and the fixed lens group 23. The first magnet can be a magnetic strip.

[0060] Specifically, when the position of the first magnet moves, the magnetic field of the first magnet will move with the first magnet. At this time, the magnetic field strength sensed by the first sensor will change. Then, the zoom lens group 22 in the projection lens 1 can be directly driven to move to the position of the preset magnetic field strength sensed by the first sensor, thereby completing the zoom process of the projection lens 1 and capturing a clear image.

[0061] Similarly, in some embodiments of this application, the focusing detection element is a second magnet, and the focusing motion element is a second sensor. The second sensor is used to sense the magnetic signal of the second magnet in order to detect the distance between the focusing lens group 21 and the fixed lens group 23.

[0062] For example, when the position of the second magnet moves, the magnetic field of the second magnet moves accordingly. At this time, the magnetic field strength sensed by the second sensor changes. The focusing lens group 21 in the projection lens 1 can then be directly driven to move to the position of the preset magnetic field strength sensed by the second sensor, thereby completing the focusing process of the projection lens 1. Preferably, both the first and second sensors are tunnel magnetoresistive (TMR) sensors. TMR sensors have better temperature stability, higher sensitivity, lower power consumption, and better linearity. Therefore, the application of TMR sensors further optimizes the focusing and zooming performance of the projection lens 1.

[0063] Please see Figure 1 In some embodiments of this application, the projection lens 1 further includes a first transmission member 51 and a second transmission member 52. The first transmission member 51 is movably connected to the lens barrel 10 and is driven to the zoom lens group 22. The first transmission member 51 is used to drive the zoom lens group 22 to slide along the extension direction of the first optical axis H. The second transmission member 52 is movably connected to the lens barrel 10 and is driven to the focusing lens group 21. The second transmission member 52 is used to drive the focusing lens group 21 to slide along the extension direction of the first optical axis H.

[0064] In some embodiments, the second transmission component 52 can be driven by a motor to precisely control the movement of the focusing lens group 21, ensuring focusing accuracy; the first transmission component 51 can be a stepper motor to achieve fine zooming of the zoom lens group 22. The two work together to improve the overall performance of the projection lens 1. Exemplarily, the second transmission component 52 is a focusing ring, and the first transmission component 51 is a zoom barrel. Both the focusing ring and the zoom barrel are rotatably connected to the lens barrel 10. The focusing ring can rotate to drive the focusing lens group 21 to slide along the extension direction of the first optical axis H in the lens barrel 10, and the zoom barrel can rotate to drive the zoom lens group 22 to slide along the extension direction of the first optical axis H, thereby realizing independent control of focusing and zooming of the projection lens 1.

[0065] Furthermore, in some embodiments of this application, the projection lens 1 further includes a driving component (not shown in the figure) disposed on the lens barrel 10. The driving component is electrically connected to both the first sensor and the second sensor. The driving component is used to receive the detection signal from the first sensor and drive the first transmission member 51 to slide the zoom lens group 22 along the extension direction of the first optical axis H. The driving component is also used to receive the detection signal from the second sensor and drive the second transmission member 52 to slide the focusing lens group 21 along the extension direction of the first optical axis H.

[0066] Specifically, the drive component has a built-in microprocessor that can process the detection data from the first and second sensors in real time, thereby optimizing the movement trajectory of the focusing lens group 21 and the zoom lens group 22, ensuring the accurate positioning of the focusing lens group 21 and the zoom lens group 22, thereby improving the imaging quality of the projection lens 1. Through the coordinated work of the drive component and the sensors, the automatic focusing and zooming operation of the projection lens 1 is realized, ensuring a fast response and capturing of clear images in various shooting environments, so as to meet the high dynamic range shooting requirements.

[0067] In some embodiments of this application, the maximum sliding distance of the focusing lens group 21 along the extension direction of the first optical axis H is less than 5 mm. The focusing lens group 21 can serve as a focusing assembly, and its small maximum sliding distance ensures efficient operation within a limited space, improving focusing speed. Furthermore, because the maximum sliding distance of the focusing lens group 21 is small, a magnet can be used as the second magnet to reduce production costs.

[0068] Thirdly, this application also provides a projector (not shown in the figure), which includes an optical engine and a projection lens 1 as described in any of the above embodiments. The projection lens 1 is connected to the optical engine, and the light source of the optical engine is projected onto an external projection plane through the projection lens 1.

[0069] Specifically, the optical engine in the projector can convert the input signal into an optical image and project it onto an external projection plane (such as a screen or wall) through the projection lens 1. The projection lens 1 can achieve focusing and zooming functions by adjusting the position of the zoom lens group 22 and / or the focusing lens group 21 relative to the fixed lens group 23, thereby improving the clarity of the image projected by the projector.

[0070] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this application, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this application. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0071] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A projection lens, characterized in that, include: Lens tube; The lens optical group is located inside the lens barrel. The lens optical group has a first optical axis and includes a zoom lens group that is movable relative to the lens barrel along the extension direction of the first optical axis. A zoom detection component includes a zoom motion component and a zoom detection component. One of the zoom motion component and the zoom detection component is connected to the zoom lens group to move and zoom with the zoom lens group, and the other is fixedly disposed relative to the lens barrel. The zoom detection component is used to cooperate with the zoom motion component to detect the movement distance of the zoom lens group relative to the lens barrel.

2. The projection lens according to claim 1, characterized in that, The lens optical assembly further includes a fixed lens group fixed to the lens barrel. The fixed lens group and the zoom lens group are arranged along the extension direction of the first optical axis. One of the zoom motion component and the zoom detection component is connected to the zoom lens group, and the other is connected to the fixed lens group. The zoom detection component is used to cooperate with the zoom motion component to detect the distance between the zoom lens group and the fixed lens group.

3. The projection lens according to claim 1, characterized in that, The zoom detection component is a first magnet, and the zoom motion component is a first sensor. The first sensor is used to sense the magnetic signal of the first magnet in order to detect the moving distance of the zoom lens group relative to the lens barrel.

4. The projection lens according to claim 3, characterized in that, The first magnet is composed of multiple magnetic blocks connected end to end, and the multiple N poles and multiple S poles of the first magnet are alternately arranged along the extension direction of the first optical axis.

5. The projection lens according to claim 1, characterized in that, The maximum sliding distance of the zoom lens group along the extension direction of the first optical axis is greater than 30 mm.

6. The projection lens according to claim 1, characterized in that, The zoom motion component is connected to the zoom lens group, and the zoom detection component is fixedly disposed relative to the lens barrel; The lens barrel is provided with a curved groove, and the zoom motion component slides within the curved groove along the extension direction of the first optical axis.

7. A projection lens, characterized in that, include: Lens tube; The lens optical group is located inside the lens barrel. The lens optical group has a first optical axis and includes a zoom lens group and a focusing lens group arranged along the extension direction of the first optical axis. Both the zoom lens group and the focusing lens group are capable of sliding relative to the lens barrel along the extension direction of the first optical axis. A zoom detection component includes a zoom motion component and a zoom detection component. One of the zoom motion component and the zoom detection component is connected to the zoom lens group to move and zoom with the zoom lens group, and the other is fixedly disposed relative to the lens barrel. The zoom detection component is used to cooperate with the zoom motion component to detect the movement distance of the zoom lens group relative to the lens barrel. The focus detection assembly includes a focus motion component and a focus detection component. One of the focus motion component and the focus detection component is connected to the focus lens group to follow the movement of the focus lens group for focusing, while the other is fixedly disposed relative to the lens barrel. The focus detection component is used to cooperate with the focus motion component to detect the movement distance of the focus lens group relative to the lens barrel.

8. The projection lens according to claim 7, characterized in that, The lens optical group also includes a fixed lens group fixed to the lens barrel, and the focusing lens group, the zoom lens group and the fixed lens group are arranged sequentially along the extension direction of the first optical axis; Wherein, one of the zoom motion component and the zoom detection component is connected to the zoom lens group, and the other of the zoom motion component and the zoom detection component is connected to the fixed lens group. The zoom detection component is used to cooperate with the zoom motion component to detect the distance between the zoom lens group and the fixed lens group. One of the focusing motion component and the focusing detection component is connected to the focusing lens group, and the other of the focusing motion component and the focusing detection component is connected to the fixed lens group. The focusing detection component is used to cooperate with the focusing motion component to detect the distance between the focusing lens group and the fixed lens group.

9. The projection lens according to claim 7, characterized in that, The zoom detection component is a first magnet, and the zoom motion component is a first sensor. The first sensor is used to sense the magnetic signal of the first magnet in order to detect the moving distance of the zoom lens group relative to the lens barrel. The focusing detection element is a second magnet, and the focusing motion element is a second sensor. The second sensor is used to sense the magnetic signal of the second magnet in order to detect the moving distance of the focusing lens group relative to the lens barrel.

10. The projection lens according to claim 7, characterized in that, The maximum sliding distance of the focusing lens group along the extension direction of the first optical axis is less than 5 mm.

11. A projector, characterized in that, The projector includes an optical engine and a projection lens as described in any one of claims 1-10, wherein the projection lens is connected to the optical engine, and the light source of the optical engine is projected onto an external projection plane through the projection lens.

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