projection lens

Abstract

This utility model relates to the field of lens technology and discloses a projection lens, including a lens body with a protective sleeve on the outside. A heating mechanism is provided on the lens body, comprising a drive motor, a rotating rod, a first gear, a large gear, a reciprocating lead screw, a second gear, a moving ring, and a heating ring. This utility model, through its heating and heat dissipation mechanisms, can effectively cope with different ambient temperatures and ensure image quality. In low-temperature environments, the drive motor and heating ring are activated to uniformly heat the lens body. This avoids changes in the relative positions and optical power between the lenses due to low-temperature contraction of the lens materials, preventing image blurring and ensuring that the projection lens can operate normally in cold environments, maintaining a stable imaging effect.

Description

Technical Field

[0001] This utility model relates to the field of lens technology, specifically to projection lenses. Background Technology

[0002] With the continuous advancement of technology, 3D depth applications are gradually emerging, and the application scope of projection lenses is becoming increasingly wide. Today, chip technology and intelligent algorithms are developing rapidly. By using an optical projection lens to project an image onto a spatial object and receiving the image signal, a 3D image containing the object's position and depth information can be calculated. This 3D image with depth information can then be further used for the development of various depth applications, such as biometrics.

[0003] According to a Chinese patent publication number "CN207516711 U", a projection lens comprises, along the optical axis from the image source side to the imaging side, the following components in sequence: a first lens with positive optical power; a second lens with negative optical power, both its image source side surface and imaging side surface being concave; a third lens with either positive or negative optical power; and a fourth lens with positive optical power, its imaging side surface being convex. The total effective focal length f of the projection lens and the effective focal length f1 of the first lens satisfy 2.0 < f / f1 < 3.5. However, in high-temperature outdoor scenes or low-temperature cold storage environments, the dimensional changes in the lens materials due to thermal expansion and contraction may lead to changes in the relative positions and optical power between the lenses, thus affecting image quality and causing image blurring. Therefore, this projection lens is proposed to address these problems. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a projection lens to address the shortcomings of the prior art.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: a projection lens, including a lens body, a protective sleeve provided on the outside of the lens body, and a heating mechanism provided on the lens body. The heating mechanism includes a drive motor, a rotating rod, a first gear, a large gear, a reciprocating screw, a second gear, a moving ring, and a heating ring. The drive motor is fixedly mounted on the lens body. One end of the rotating rod is fixedly connected to the output end of the drive motor, and the other end of the rotating rod rotates on the lens body through a bearing. The first gear is fixedly sleeved on the rotating rod. The large gear rotates on the lens body and meshes with the first gear. The reciprocating screw is rotately connected to the lens body through a bearing. The second gear is fixedly sleeved on the reciprocating screw and meshes with the large gear. The moving ring is threaded on the reciprocating screw. The heating ring rotates on the moving ring through a bearing.

[0006] Preferably, the inner wall of the protective sleeve is provided with a circumferential groove, and a movable rod is fixedly connected to the heating ring, and the movable rod is slidably connected to the inner wall of the circumferential groove.

[0007] Preferably, there are two moving rods, which are respectively arranged on both sides of the heating ring, and both moving rods are slidably connected to the inner wall of the surrounding groove.

[0008] Preferably, the movable ring is movably sleeved on the rotating rod, and the inner wall of the movable ring is slidably connected to the outer wall of the lens body.

[0009] Preferably, the heating mechanism is provided with a heat dissipation mechanism, which includes a thermoelectric cooler, a transfer rod, and a heat-conducting plate. The thermoelectric cooler is disposed on the top of the moving ring. The transfer rod is fixedly connected to the cooling end of the thermoelectric cooler and is also fixedly connected to the moving ring. The heat-conducting plate is fixedly connected to the inner wall of the protective sleeve and is slidably connected to the heating end of the thermoelectric cooler.

[0010] Preferably, a frame is fixedly connected to the top of the protective sleeve, and a cooling fan is provided on the top of the inner wall of the frame, with the cooling fan located on top of the heat-conducting plate.

[0011] The present invention adopts the above technical solution, which can bring the following beneficial effects:

[0012] 1. This projection lens, through its heating and cooling mechanisms, effectively copes with varying ambient temperatures, ensuring image quality. In low-temperature environments, the drive motor and heating ring are activated to uniformly heat the lens body. This prevents changes in the relative positions of the lenses and optical power caused by low-temperature contraction of the lens materials, thus preventing image blurring and ensuring the projection lens functions normally and maintains stable imaging performance even in cold environments. In high-temperature environments, the drive motor and semiconductor cooling chip are activated to cool the lens body, preventing the lens from overheating and affecting image quality, allowing the projection lens to provide clear images even in hot environments.

[0013] 2. The projection lens features a protective sleeve with an inner groove that works in conjunction with a moving rod on the heating ring. This not only restricts the movement of the heating ring, ensuring stable rotation during movement and uniform heating of the lens body, but also enhances the overall structural stability. The semiconductor cooling chip acts directly on the moving ring, and the cooling effect is enhanced through the transfer rod. The heat-conducting plate quickly transfers the heat from the heating end of the semiconductor cooling chip, and the cooling fan accelerates airflow, enhancing heat dissipation efficiency and improving the practicality of the projection lens in high-temperature environments. Attached Figure Description

[0014] Figure 1 This is a front view of the present utility model;

[0015] Figure 2 This is a schematic diagram of the internal structure of this utility model;

[0016] Figure 3 This is a schematic diagram of the rear side of the internal structure of this utility model;

[0017] Figure 4 This is a schematic diagram of the protective sleeve of this utility model;

[0018] Figure 5 This is an enlarged schematic diagram of part A of this utility model.

[0019] In the diagram: 1. Lens body; 2. Protective cover; 3. Heating mechanism; 31. Drive motor; 32. Rotating rod; 33. First gear; 34. Large gear; 35. Reciprocating lead screw; 36. Second gear; 37. Moving ring; 38. Heating ring; 39. Surrounding groove; 310. Moving rod; 4. Heat dissipation mechanism; 41. Semiconductor cooling chip; 42. Transmission rod; 43. Heat-conducting plate; 44. Frame; 45. Cooling fan. Detailed Implementation

[0020] 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.

[0021] Please see Figure 1-5One embodiment of this utility model is as follows: a projection lens, including a lens body 1, a protective sleeve 2 on the outside of the lens body 1, and a heating mechanism 3 on the lens body 1. The heating mechanism 3 includes a drive motor 31, a rotating rod 32, a first gear 33, a large gear 34, a reciprocating screw 35, a second gear 36, a moving ring 37, and a heating ring 38. The drive motor 31 is fixedly mounted on the lens body 1. One end of the rotating rod 32 is fixedly connected to the output end of the drive motor 31, and the other end of the rotating rod 32 rotates on the lens body 1 through a bearing. The first gear 33 is fixedly sleeved on the rotating rod 32. The large gear 34 rotates on the lens body 1 and meshes with the first gear 33. The reciprocating screw 35 rotates through a bearing. The second gear 36 is fixedly sleeved on the reciprocating screw 35 and meshes with the large gear 34. The moving ring 37 is threadedly sleeved on the reciprocating screw 35. The heating ring 38 is rotatably connected to the moving ring 37 through a bearing. The inner wall of the protective sleeve 2 is provided with a surrounding groove 39. The heating ring 38 is fixedly connected to the moving rod 310 and is slidably connected to the inner wall of the surrounding groove 39. There are two moving rods 310, which are respectively set on both sides of the heating ring 38 and are slidably connected to the inner wall of the surrounding groove 39. The moving ring 37 is movably sleeved on the rotating rod 32 and is slidably connected to the outer wall of the lens body 1.

[0022] Working principle: When the outside temperature is low, the drive motor 31 and heating ring 38 are started. The drive motor 31 drives the rotating rod 32 to rotate, the rotating rod 32 drives the first gear 33 to rotate, which in turn drives the second gear 36 to rotate through the large gear 34. The rotation of the second gear 36 drives the reciprocating screw 35 to rotate, which in turn drives the moving ring 37 to move, which in turn drives the heating ring 38 to move. When the heating ring 38 moves, it drives the moving rod 310 to move, which in turn drives the heating ring 38 to rotate under the action of the surrounding groove 39, thereby uniformly heating the lens body 1 and avoiding the effect of low temperature on the use of the lens body 1.

[0023] Please see Figure 1-5 Based on the above embodiments, in another preferred embodiment of the present invention, the heating mechanism 3 is provided with a heat dissipation mechanism 4. The heat dissipation mechanism 4 includes a semiconductor cooling chip 41, a transmission rod 42, and a heat-conducting plate 43. The semiconductor cooling chip 41 is disposed on the top of the moving ring 37. The transmission rod 42 is fixedly connected to the cooling end of the semiconductor cooling chip 41 and fixedly connected to the moving ring 37. The heat-conducting plate 43 is fixedly connected to the inner wall of the protective sleeve 2, and the heat-conducting plate 43 is slidably connected to the heating end of the semiconductor cooling chip 41. A frame 44 is fixedly connected to the top of the protective sleeve 2. A cooling fan 45 is disposed on the top of the inner wall of the frame 44, and the cooling fan 45 is located on the top of the heat-conducting plate 43.

[0024] Working principle: When the outside temperature is high, the drive motor 31 and the semiconductor cooling chip 41 are started. The drive motor 31 drives the moving ring 37 to move, which in turn drives the semiconductor cooling chip 41 to move. The cooling end of the semiconductor cooling chip 41 cools the moving ring 37 through the transmission rod 42. Then, the contact between the moving ring 37 and the lens body 1 cools the lens body 1, preventing the temperature from being too high and affecting the performance of the lens body 1. At the same time, the heat dissipation fan 45 and the heat conduction plate 43 dissipate heat from the heat-generating end of the semiconductor cooling chip 41, making the semiconductor cooling chip 41 operate more stably.

[0025] It is worth noting that, for ease of control, the control panel 15 in the above embodiment is equipped with a heater control switch and a cylinder control switch. The heater control switch can control the heater, and the cylinder control switch can control the cylinder to work. These are all existing technologies and are not the main innovations, so they will not be described in detail here.

[0026] This utility model provides a projection lens. There are many methods and approaches to implement this technical solution. The above description is only a preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model. All components not explicitly stated in this embodiment can be implemented using existing technology.

Claims

1. Projection lens comprising a lens body (1), characterized in that: The lens body (1) is provided with a protective sleeve (2). A heating mechanism (3) is provided on the lens body (1). The heating mechanism (3) includes a drive motor (31), a rotating rod (32), a first gear (33), a large gear (34), a reciprocating screw (35), a second gear (36), a moving ring (37), and a heating ring (38). The drive motor (31) is fixedly installed on the lens body (1). One end of the rotating rod (32) is fixedly connected to the output end of the drive motor (31), and the other end of the rotating rod (32) rotates on the lens body through a bearing. On the head body (1), the first gear (33) is fixedly sleeved on the rotating rod (32), the large gear (34) is rotatably sleeved on the lens body (1) and meshes with the first gear (33), the reciprocating screw (35) is rotatably connected to the lens body (1) through a bearing, the second gear (36) is fixedly sleeved on the reciprocating screw (35) and meshes with the large gear (34), the moving ring (37) is threaded on the reciprocating screw (35), and the heating ring (38) is rotatably connected to the moving ring (37) through a bearing.

2. The projection lens of claim 1, wherein: The inner wall of the protective sleeve (2) is provided with a surrounding groove (39), and a moving rod (310) is fixedly connected to the heating ring (38), and the moving rod (310) is slidably connected to the inner wall of the surrounding groove (39).

3. The projection lens of claim 2, wherein: There are two moving rods (310), which are respectively arranged on both sides of the heating ring (38), and both moving rods (310) are slidably connected to the inner wall of the surrounding groove (39).

4. The projection lens of claim 3, wherein: The movable ring (37) is movably sleeved on the rotating rod (32), and the inner wall of the movable ring (37) is slidably connected to the outer wall of the lens body (1).

5. The projection lens of claim 4, wherein: The heating mechanism (3) is provided with a heat dissipation mechanism (4), which includes a semiconductor cooling chip (41), a transmission rod (42), and a heat-conducting plate (43). The semiconductor cooling chip (41) is disposed on the top of the moving ring (37). The transmission rod (42) is fixedly connected to the cooling end of the semiconductor cooling chip (41) and fixedly connected to the moving ring (37). The heat-conducting plate (43) is fixedly connected to the inner wall of the protective sleeve (2), and the heat-conducting plate (43) is slidably connected to the heating end of the semiconductor cooling chip (41).

6. The projection lens of claim 5, wherein: The top of the protective sleeve (2) is fixedly connected to a frame (44), and a cooling fan (45) is provided on the top of the inner wall of the frame (44), and the cooling fan (45) is located on the top of the heat conduction plate (43).

Images