Focusing lens

Abstract

The utility model relates to a focusing lens which is mainly composed of a focusing base, a first driving source, a lens part and an infrared detection part. The focusing base serves as a basic supporting structure of the whole focusing lens and provides a stable mounting platform for other components. The first driving source is rotatably arranged on the focusing base and provides power for movement of the lens component. The lens component is movably inserted on the focusing base and can move back and forth along the axis of the focusing base under the driving of the first driving source so as to realize the adjustment of the focal length. The infrared detection part and the focusing base are coaxially arranged, movement of the lens part is limited, and safety and stability of the lens part in the focusing process are ensured. According to the utility model, accurate focal length adjustment can be realized, the projector can be ensured to present clear images in different use scenes, and the projection quality is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of projector optical components, particularly to a focusing lens for a projector. BACKGROUND

[0002] In the process of the continuous development of projector technology, the performance of the focusing lens plays a crucial role in the projection quality. The traditional projector focusing lens has some shortcomings, such as inaccurate focusing, which leads to blurred images when displayed on different distances or screens. Moreover, the traditional focusing lens is often complex in structure design and occupies a large space, which is not conducive to the miniaturization of projectors. In addition, there is a lack of effective limiting and detection mechanism in the focusing process, which can easily cause the lens to move excessively and damage the equipment.

[0003] Therefore, it is of great practical significance to develop a new type of focusing lens that can effectively solve the above problems. SUMMARY

[0004] The utility model aims at providing a focusing lens that can realize accurate focal length adjustment, ensure that the projector can present clear images in different use scenarios, improve the projection quality, and be suitable for various projector equipment, whether it is a commercial or a household projector, to obtain better visual effect.

[0005] To achieve the above technical scheme, the technical scheme of the utility model is as follows: the focusing lens mainly consists of a focusing base, a first driving source, a lens component, and an infrared detection component. The focusing base serves as the basic support structure of the entire focusing lens and provides a stable mounting platform for other components. The first driving source is rotatably arranged on the focusing base and provides power for the movement of the lens component. The lens component is movably inserted into the focusing base and can move back and forth along the axis of the focusing base under the drive of the first driving source to realize focal length adjustment. The infrared detection component is coaxially arranged with the focusing base and limits the movement of the lens component to ensure its safety and stability during the focusing process.

[0006] Further, the first driving source is a motor that is locked on the focusing base by a fastener and is arranged in parallel with the axis of the focusing base. This installation method ensures that the direction of the motor's output power is consistent with the moving direction of the lens component, improving the efficiency of power transmission. The output end of the motor is connected with a gear, which is rotatably arranged on the focusing base. The rotation of the gear converts the rotational power of the motor into linear movement power of the lens component, realizing accurate power transmission and focal length adjustment control.

[0007] Further, the lens component includes coaxially arranged lens assembly, barrel lens housing, lens gland and reversing seat. The lens assembly is fixedly arranged in the inner side of the barrel lens housing, ensuring the stability of the lens during movement and protecting the lens from external interference. The barrel lens housing is screwed on the lens gland at one end, facilitating the installation and disassembly of the lens assembly, and facilitating the maintenance and replacement of the lens. The lens gland is slidingly arranged on the reversing seat, and the lens gland extends radially outward at one end and is provided with a columnar driving portion, and four driving portions are circumferentially arranged on the lens gland and are matched with the circumferentially and obliquely arranged sliding grooves in the inner side of the reversing seat. When the reversing seat moves, the linear motion of the reversing seat is converted into the rotary motion of the lens gland through the cooperation of the sliding grooves and the driving portions, so that the lens assembly in the barrel lens housing is driven to realize rotary focusing. The reversing seat is provided with an arc-shaped gear rack at one end, which is used for meshing with the gear of the first driving source to realize power transmission. The reversing seat is also provided with a rotation limiting protrusion to prevent excessive rotation of the reversing seat during movement. The reversing seat extends radially outward at one end and is provided with a clamping portion, and the arc-shaped gear rack is arranged on the clamping portion to ensure the stability of the meshing of the gear rack and the gear.

[0008] Further, the infrared detection component includes a lens limiting ring detachably locked on the focusing base, and an infrared assembly is detachably mounted on the lens limiting ring. The lens limiting ring is provided with a space arc, which provides space for the movement of the lens component and the installation of other components. The focusing base is provided with guiding sliding grooves arranged in an array on the circumferential side, and the guiding sliding grooves are arranged in parallel with the axis of the focusing base. During movement, the lens component is matched with the guiding sliding grooves to ensure the accuracy of the movement direction, and the infrared detection component can detect and limit the position of the lens component in the guiding sliding groove through infrared signals, preventing the lens component from exceeding the normal movement range.

[0009] Compared with the prior art, the utility model has the advantages of reasonable structure design, simple operation, precise focal length adjustment, clear image display in different use scenarios, and improved projection quality. BRIEF DESCRIPTION OF DRAWINGS

[0010] To further illustrate the embodiments, the utility model provides the attached drawings. These drawings are part of the disclosure of the utility model, mainly used to illustrate the embodiments, and can be used to explain the operation principle of the embodiments in combination with the related description of the specification. With reference to these contents, those skilled in the art should understand other possible embodiments and the advantages of the utility model. The components in the drawings are not drawn to scale, and similar component symbols are usually used to represent similar components.

[0011] Fig. 1 The three-dimensional view of the focusing lens;

[0012] Fig. 2 The exploded view of the focusing lens. Detailed Implementation

[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0014] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0015] Please see the appendix Figs. 1-2 As shown: A focusing lens includes a focusing base 1, the focusing lens comprising:

[0016] The first drive source 2 is rotatably mounted on the focusing base 1 to provide power;

[0017] Lens component 3 is movably inserted into the focusing base 1, and the first driving source 2 can drive the lens component 3 to move back and forth along the axis of the focusing base 1.

[0018] The infrared detection component 4 is coaxially arranged with the focusing base 1 and is used to move and limit the lens component 3 on the focusing base 1.

[0019] The various components of the aforementioned focusing lens, including the focusing base, the first drive source, the lens assembly, and the infrared detection component, are designed to work closely together, forming a compact structural unit. This compact layout not only reduces the overall size of the device, making the projector lighter, smaller, and easier to carry and install, but also optimizes the utilization efficiency of internal space, reducing unnecessary space occupation. For example, in portable projectors, the compact focusing lens structure helps reduce the size and weight of the device, making it convenient for users to use in different locations; in fixed-installation projectors, it also saves space and makes the device layout more rational. The first drive source is rotatably mounted on the focusing base, providing stable and reliable power for the movement of the lens assembly. It can precisely adjust the output according to the control signal, driving the lens assembly to move back and forth along the axis of the focusing base, achieving precise focus adjustment. Whether making fine adjustments at short distances or significant focusing at long distances, the lens is ensured to be accurately positioned at the required focal length. This allows the projector to present clear and sharp images at different projection distances and screen sizes. The lens component is movably inserted into the focusing base and moves along a specific axis under the drive of the primary drive source. This design ensures the smoothness and accuracy of the focusing process. The focusing base provides stable support and guidance for the lens component, preventing shaking or shifting during movement and ensuring precise and consistent focus adjustment. Compared to traditional focusing methods, the structural design of this focusing lens reduces focusing errors caused by external interference or mechanical instability, improving the reliability and repeatability of focusing. Stable focusing performance is maintained even when the projector is frequently used for displaying different content or switching scenes.

[0020] Based on the above embodiments, the first driving source 2 is a motor 21; the motor 21 is fastened to the focusing base 1 by fasteners and is arranged parallel to the axis of the focusing base 1; the output end of the motor 21 is connected to a gear 22; the gear 22 is rotatably mounted on the focusing base 1; the first driving source is a motor, fastened to the focusing base by fasteners and arranged parallel to the axis of the focusing base. This installation method ensures that the direction of the motor output power is consistent with the direction of movement required by the lens component, minimizing losses and deviations during power transmission. The gear connected to the motor output end is rotatably mounted on the focusing base and meshes with the arc-shaped rack of the reversing seat, which can accurately convert the rotational power of the motor into the linear reciprocating movement power of the lens component. This allows the lens component to achieve precise position adjustment according to the speed and direction of the motor during focusing, thereby achieving precise control of the projector's focal length and improving the clarity and quality of the projected image. Of course, in other embodiments, the first driving source 2 can also be a cylinder-type electric motor or other rotating mechanical structure, which is not specifically limited here.

[0021] Based on the above embodiments, the lens component 3 includes a lens assembly 31, a barrel lens housing 32, a lens cap 33, and a reversing seat 34 arranged coaxially. The lens assembly 31 is fixed inside the barrel lens housing 32. One end of the barrel lens housing 32 is screwed onto the lens cap 33. The lens cap 33 is slidably mounted on the reversing seat 34. The lens component consists of a lens assembly, a barrel lens housing, a lens cap, and a reversing seat arranged coaxially. This structural design ensures the stability of the lens assembly during movement and focusing. The lens assembly is fixed inside the barrel lens housing, avoiding interference from external factors and protecting the optical performance of the lens. One end of the barrel lens housing is screwed onto the lens cap, facilitating the installation and maintenance of the lens assembly and ensuring the airtightness of the structure. The lens cap is slidably mounted on the reversing seat. Through the cooperation of its circumferentially arrayed columnar driving part and the inclined sliding groove inside the reversing seat, the linear motion of the reversing seat is converted into the rotational motion of the lens cap, thereby driving the lens assembly to rotate and focus. This unique design makes focusing more flexible and versatile, adapting to different projection scenarios and user needs. For example, in projection environments at different distances, rotating the focus knob allows for quick identification of the optimal focal length, improving focusing efficiency and convenience.

[0022] Based on the above embodiments, the lens assembly 31 includes a lens barrel; a first lens and a second lens are fixed at both ends of the lens barrel;

[0023] One end of the lens cap 33 extends outward and is provided with a columnar driving part; four driving parts are arranged in a circumferential array on the lens cap 33.

[0024] The inner circumference of the reversing seat 34 is inclined with a sliding groove adapted to the driving part; one end of the reversing seat 34 is provided with an arc-shaped rack; the reversing seat 34 is provided with a rotation limiting protrusion; one end of the reversing seat 34 extends radially outward with a locking part; the arc-shaped rack is disposed on the locking part. The lens assembly has a first lens and a second lens fixed at both ends of the lens barrel. This lens combination can be optimized according to the optical design requirements of the projector to achieve precise refraction and focusing of light, improving the contrast, brightness, and color reproduction of the projected image. During focusing, the precise cooperation between the lens cap driving part and the reversing seat sliding groove, as well as the stable meshing of the arc-shaped rack and gear, ensures accurate rotation and movement of the lens assembly. Every minute adjustment is accurately reflected in the change of focal length, avoiding jitter and deviation during focusing, ensuring the stability and continuity of the projected image during focusing, and providing users with a smooth visual experience.

[0025] Based on the above embodiments, the infrared detection component 4 includes a lens limiting ring 41 that is detachably locked onto the focusing base 1; an infrared component 42 is detachably mounted on the lens limiting ring 41. The lens limiting ring of the infrared detection component is detachably locked onto the focusing base, facilitating installation and maintenance, while also securely fixing the infrared component in a suitable position. The clearance arc on the lens limiting ring provides necessary space for the movement of other components, avoiding interference. The infrared component is mounted on the lens limiting ring and coaxially arranged with the focusing base, enabling real-time monitoring of the lens component's position. Through infrared signal detection, when the lens component moves to its extreme position, a signal is promptly emitted, working in conjunction with the first drive source to prevent damage caused by excessive movement of the lens component. This reliable limiting and monitoring function effectively protects the critical components of the focusing lens, extends the lens's service life, and reduces equipment maintenance costs.

[0026] Based on the above embodiments, a clearance arc begins to appear on the lens limiting ring 41;

[0027] The focusing base 1 has guide grooves arrayed around its periphery; these guide grooves are parallel to the axis of the focusing base 1. The guide grooves arrayed around the focusing base are parallel to the axis, and the lens component cooperates with the guide grooves during movement to ensure the accuracy of the movement direction. The infrared detection component, while monitoring the position of the lens component, can also use the guide grooves as a reference to further improve the accuracy of judging the position of the lens component. This helps to achieve more precise focus positioning during focusing, enabling the projector to quickly and accurately adjust to the optimal focus. Whether in initial installation and debugging or in daily use, the synergistic effect of the infrared detection component and the guide grooves improves the accuracy and efficiency of focusing, reducing the user's operation time and effort.

[0028] The working principle of this utility model is as follows: When the projector needs to adjust the focus, the first drive source (motor) starts to work. The motor is fastened to the focusing base by fasteners and is parallel to the axis of the focusing base, and the gear connected to its output end rotates accordingly. This gear is rotatably mounted on the focusing base and meshes with the arc-shaped rack at one end of the reversing seat. Since the arc-shaped rack is set on the locking part of the reversing seat, the stability of the meshing is ensured. When the motor drives the gear to rotate, the rotational power of the motor is transmitted to the reversing seat through the meshing action of the gear and the arc-shaped rack, driving the reversing seat to move back and forth along the axis of the focusing base. The inner circumference of the reversing seat is inclined with a sliding groove adapted to the lens cover drive part. One end of the lens cover has four columnar drive parts arranged in a circumferential array extending radially outward, and the lens cover is slidably mounted on the reversing seat. When the reversing seat moves under the drive of the first drive source, the linear motion of the reversing seat is converted into the rotational motion of the lens cover through the cooperation of the sliding groove and the drive part. The lens cap is screwed onto one end of the telescope housing, while the lens assembly is fixed inside the telescope housing. Therefore, the rotation of the lens cap drives the lens assembly inside the telescope housing to rotate and focus. During focusing, the infrared detection component plays a crucial role. A lens limiting ring is detachably locked to the focusing base, on which the infrared component is mounted. The lens limiting ring also has a clearance arc to provide space for the movement of other components. The focusing base has guide grooves arranged parallel to the axis on its periphery. The lens assembly, during movement, ensures the accuracy of its direction of movement by engaging with these guide grooves. The infrared detection component monitors the position of the lens assembly within the guide grooves in real time using infrared signals. When the lens assembly reaches its limit position, the infrared detection component sends a signal, and the first drive source stops working, preventing damage from excessive movement of the lens assembly. Simultaneously, the lens limiting ring physically limits the range of movement of the lens assembly, ensuring that the lens assembly moves within a safe range.

[0029] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art should be able to make equivalent embodiments by making some changes or modifications to the above-disclosed technical content without departing from the scope of the present invention. Any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A focusing lens, comprising a focusing base (1), characterized in that, The focusing lens includes: The first drive source (2) is rotatably mounted on the focusing base (1) and is used to provide power; The lens component (3) is movably inserted into the focusing base (1), and the first driving source (2) can drive the lens component (3) to move back and forth along the axis of the focusing base (1); The infrared detection component (4) is coaxially arranged with the focusing base (1) and is used to move and limit the lens component (3) on the focusing base (1).

2. The focusing lens as described in claim 1, characterized in that: The first driving source (2) is a motor (21); the motor (21) is fastened to the focusing base (1) by fasteners and is arranged parallel to the axis of the focusing base (1); the output end of the motor (21) is connected to a gear (22); the gear (22) is rotatably mounted on the focusing base (1).

3. The focusing lens as described in claim 1, characterized in that: The lens component (3) includes a lens assembly (31) coaxially arranged, a telescope housing (32), a lens cap (33), and a reversing seat (34); the lens assembly (31) is fixed inside the telescope housing (32); one end of the telescope housing (32) is screwed onto the lens cap (33); the lens cap (33) is slidably disposed on the reversing seat (34).

4. The focusing lens as described in claim 3, characterized in that: The lens assembly (31) includes a lens barrel; a first lens and a second lens are fixed at both ends of the lens barrel; One end of the lens cap (33) extends outward and is provided with a columnar driving part; four driving parts are arranged in a circumferential array on the lens cap (33); The inner circumference of the reversing seat (34) is inclined with a sliding groove adapted to the driving part; one end of the reversing seat (34) is provided with an arc-shaped rack; the reversing seat (34) is provided with a rotation limiting protrusion; one end of the reversing seat (34) extends radially outward with a locking part; the arc-shaped rack is provided on the locking part.

5. The focusing lens as described in claim 1, characterized in that: The infrared detection component (4) includes a lens limiting ring (41) that can be detachably locked onto the focusing base (1); an infrared component (42) is detachably mounted on the lens limiting ring (41).

6. The focusing lens as described in claim 5, characterized in that: The lens limiting ring (41) begins to have a clearance arc; The focusing base (1) has guide grooves arranged on its periphery; the guide grooves are arranged parallel to the axis of the focusing base (1).

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