A light shield structure for an image capture device

Abstract

The application provides a light shield structure for an image acquisition device, and relates to the technical field of image acquisition.The light shield structure comprises a shell, and has a through hole for a lens to pass through.A linkage adjusting mechanism is arranged to continuously and steplessly adjust the degree of light shielding.When the linkage adjusting mechanism is adjusted, the internal flexible light shielding component will deform uniformly in a curved surface, accurately changing the density and geometric shape of the mesh structure.This not only allows the amount of light to adapt to different light intensities, but also effectively cuts off stray light at different angles, suppresses glare and ghosting.Meanwhile, the structure is designed with an extremely close layout and ultra-fine light shielding units to ensure its optical invisibility, avoid imaging defects, and improve the stability and dust resistance of the mechanism with the help of the internal filling material, thereby significantly improving the environmental adaptability and imaging effect of the image acquisition device without affecting the imaging quality.

Description

Technical Field

[0001] This utility model relates to the field of image acquisition technology, and more specifically, to a light shield structure for an image acquisition device. Background Technology

[0002] In the field of image acquisition technology, a lens hood is a crucial accessory mounted on the front of a lens, its core function being to suppress and block stray light that is not essential for imaging. In complex lighting conditions such as backlighting or sidelighting, this stray light, after multiple reflections from the lens barrel or lens elements, easily creates glare and ghosting on the sensor, severely degrading image contrast and color fidelity. Traditional lens hoods generally employ a fixed cylindrical or petal-shaped structure, typically made of engineering plastics or rubber. The depth and opening shape of the lens hood are determined by precisely calculating the lens's angle of view, aiming to block harmful light outside the field of view to the greatest extent possible while ensuring that the effective field of view necessary for imaging is not obstructed.

[0003] However, once the existing light shield structure is designed, its physical dimensions and shading angle remain fixed. This leads to a significant drawback in practical applications: it cannot adapt to dynamic changes in ambient light intensity. When the ambient light is too strong, a fixed light shield may not completely eliminate glare; while in low light, it may lose some effective light intake due to excessive shading. To cope with different lighting conditions, users often have to resort to additional methods such as replacing light shields of different specifications or using neutral density filters, which is cumbersome and lacks flexibility.

[0004] Therefore, we have made improvements to this by proposing a light shield structure for image acquisition devices. Utility Model Content

[0005] In order to achieve the above-mentioned objectives, this utility model provides a light shield structure for an image acquisition device to improve the above-mentioned problems.

[0006] The application is as follows:

[0007] include:

[0008] The housing has a through hole for the lens to pass through, and a sliding groove is provided on the side near the lens.

[0009] The mounting plate is slidably fitted in the sliding groove and has several connecting spring pieces on it;

[0010] The roll, connected to and driven by the connecting spring, is evenly distributed on the inner wall of the outer shell and forms a light-transmitting channel.

[0011] An elastic frame is connected to the free end of each of the rollers, and several light-shielding ropes with gaps are evenly distributed on it.

[0012] When the mounting plate moves along the sliding groove, the elastic frame is compressed, causing the light-shielding rope to bend and cover the light-transmitting channel.

[0013] Preferably, the outer shell adjacent to the lens is cylindrical, and the sliding groove is divided into a straight part parallel to the axis of the outer shell and a rotating part extending along the circumference of the outer shell. When the mounting plate rotates along the rotating part, the gap between the light-shielding ropes changes into a diamond shape.

[0014] Preferably, the distance between the light-shielding cord and the lens is less than 5 cm, and the diameter of the light-shielding cord is less than 0.1 mm.

[0015] Preferably, the light-shielding ropes are arranged at intervals from the center of the elastic frame outwards, gradually becoming sparser.

[0016] Preferably, it also includes a sponge filling the space between the outer shell and the roll, the sponge having linear pores.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0018] In the scheme of this application:

[0019] To address the problems in existing technologies, this application achieves continuous, stepless adjustment of the light-shielding level through a linkage adjustment mechanism. During adjustment, the internal flexible light-shielding components undergo uniform curved deformation, precisely altering the density and geometry of their mesh structure. This not only allows the amount of light received to adapt to different light intensities but also effectively cuts off stray light at different angles, suppressing glare and ghosting. Simultaneously, the structure's extremely close arrangement and ultra-fine light-shielding unit design ensure optical concealment, avoiding imaging defects. Furthermore, the internal filling material enhances the mechanism's stability and dust resistance, thereby significantly improving the environmental adaptability and imaging effect of the image acquisition device without compromising image quality. Attached Figure Description

[0020] Figure 1 A front view of a light shield structure for an image acquisition device provided in this application;

[0021] Figure 2 A cross-sectional view of a light shield structure for an image acquisition device provided in this application;

[0022] Figure 3 A schematic diagram of a sliding groove structure for a light shield structure of an image acquisition device provided in this application;

[0023] Figure 4 This is an enlarged view of point A of a light shield structure for an image acquisition device provided in this application.

[0024] The image shows:

[0025] 1. Outer shell; 12. Sliding groove; 2. Mounting plate; 21. Connecting spring; 3. Roller; 4. Elastic frame; 41. Sunshade rope; 5. Sponge. Detailed Implementation

[0026] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention 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 invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0027] For an example, please refer to... Figure 1 , Figure 2 , Figure 3 and Figure 4 A light shield structure for an image acquisition device, comprising:

[0028] The outer casing 1 has a through hole for the lens to pass through, and a sliding groove 12 is provided on the side near the lens.

[0029] Mounting plate 2 is slidably fitted in sliding groove 12, and has several connecting spring pieces 21 on it;

[0030] The drum 3 is connected to and driven by the connecting spring 21, and is evenly distributed on the inner wall of the outer shell 1, forming a light-transmitting channel.

[0031] The elastic frame 4 is connected to the free end of each roll 3, and several light-blocking ropes 41 with gaps are evenly distributed on it.

[0032] When the mounting plate 2 moves along the sliding groove 12, the elastic frame 4 is squeezed and the light-shielding rope 41 is bent and covers the light-transmitting channel.

[0033] When the user pushes the mounting plate 2 to move along the sliding groove 12, this linear motion is transmitted to the drum 3 through several connecting springs 21. The connecting springs 21 convert the translational motion of the mounting plate 2 into a tangential driving force on the drum 3, enabling multiple drums 3 to rotate synchronously and uniformly.

[0034] As the drum 3 rotates, the elastic frame 4 connected to its free end begins to be pulled. The winding or unwinding action of the drum 3 directly changes the position and shape of the elastic frame 4 within the internal space of the outer casing 1. Originally in an extended state, the elastic frame 4, under the pull of the drum 3, begins to contract towards the center area of ​​the light-transmitting channel, achieving initial adjustment of the light-blocking coverage.

[0035] When the elastic frame 4 deforms, the contraction of the elastic frame 4 creates a squeezing effect on the light-blocking ropes 41, forcing these originally relatively straight light-blocking ropes 41 to overcome their own rigidity and bend. This bending is not random, but under the constraint of the elastic frame 4, the numerous light-blocking ropes 41 together form a mesh-like curved surface with a radius, which gradually covers the light-transmitting channel formed by the roll 3.

[0036] After the curved mesh structure formed by the light-blocking ropes 41 covers the light-transmitting channel, the projected cross-sectional area of ​​each curved light-blocking rope 41 increases, and the effective light-blocking area of ​​the mesh surface they collectively form also changes accordingly. By adjusting the position of the mounting plate 2, the curvature and coverage density of this surface can be controlled, thereby achieving continuous and stepless adjustment of the effective light-transmitting area of ​​the light-transmitting channel.

[0037] The outer casing 1, adjacent to the lens, is cylindrical. The sliding groove 12 is divided into a straight section parallel to the axis of the outer casing 1 and a rotating section extending along the circumference of the outer casing 1. When the mounting plate 2 rotates along the rotating section, the gap between the light-shielding ropes 41 changes to a diamond shape. When the mounting plate 2 moves along the straight section, the coverage area of ​​the light-shielding ropes 41 can be quickly and linearly adjusted. When it rotates into the rotating section, the rotation of the mounting plate 2 drives the roller 3 to produce a more precise synchronous twist through the connecting spring 21, which in turn causes the elastic frame 4 to deform circumferentially, ultimately resulting in a diamond-shaped change in the gap between the light-shielding ropes 41. This change in geometry allows for the effective cutting of incident stray light at different angles without significantly reducing the total light-transmitting area, enhancing the ability to suppress glare from specific directions.

[0038] The distance between the light-blocking cord 41 and the lens is less than 5 cm, and the diameter of the light-blocking cord 41 is less than 0.1 mm. This extremely close distance ensures that the light-blocking cord 41 remains outside the depth of field of the lens in any adjustment state, creating a highly blurred image. At the same time, the ultra-fine diameter allows the size of the circle of confusion it forms on the sensor to be dispersed across multiple pixels, resulting in a smooth transition of the light-blocking effect without leaving harsh edges or shadows in the final image, thus achieving the effect of "physically present but optically invisible".

[0039] The light-blocking ropes 41 are arranged from the center of the elastic frame 4 outwards, gradually becoming sparser. The central area of ​​the light-transmitting channel always maintains a high light-blocking density to effectively suppress the strongest axial light. The sparse distribution in the edge area can provide a certain light-blocking effect while avoiding excessive blocking of light at the edge of the field of view, which helps to reduce the occurrence of vignetting and achieve a balance in the uniformity of illumination.

[0040] It also includes a sponge 5 filled between the outer shell 1 and the roll 3. The pores of the sponge 5 are linear. As a soft filler, it can absorb the minor vibrations that may be generated during the operation of the mechanism, ensuring the stability of the light-shielding rope 41 array and avoiding interference with imaging due to shaking. Secondly, the linear pores are conducive to guiding airflow and assisting in heat dissipation. Furthermore, since the sponge 5 is fixed to the outer shell 1 and in contact with the roll 3, the roll 3 can squeeze the gaps in the sponge 5 during the winding and unwinding process, adjusting the amount of light entering from the periphery.

[0041] The technical scope of this utility model is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this utility model, and all such modifications and variations should fall within the protection scope of this utility model.

Claims

1. A light shield structure for an image acquisition device, characterized in that, include: The outer casing (1) has a through hole for the lens to pass through, and a sliding groove (12) is provided on the side near the lens. The mounting plate (2) is slidably fitted in the sliding groove (12), and a plurality of connecting spring pieces (21) are provided on it. The roll (3) is connected to and driven by the connecting spring (21), and is evenly distributed on the inner side wall of the outer shell (1) to form a light-transmitting channel. The elastic frame (4) is connected to the free end of each of the rollers (3), and a number of light-blocking ropes (41) with gaps are evenly distributed on it. When the mounting plate (2) moves along the sliding groove (12), the elastic frame (4) is squeezed and the light-shielding rope (41) is bent and covers the light-transmitting channel.

2. The light shield structure for an image acquisition device according to claim 1, characterized in that, The outer shell (1) is cylindrical on the side adjacent to the lens. The sliding groove (12) is divided into a straight part parallel to the axis of the outer shell (1) and a rotating part extending along the circumference of the outer shell (1). When the mounting plate (2) rotates along the rotating part, the gap between the light-shielding ropes (41) changes to a rhomboid shape.

3. The light shield structure for an image acquisition device according to claim 2, characterized in that, The distance between the light-shielding cord (41) and the lens is less than 5 cm, and the diameter of the light-shielding cord (41) is less than 0.1 mm.

4. A light shield structure for an image acquisition device according to claim 3, characterized in that, The light-blocking rope (41) is located in the center of the elastic frame (4) and is arranged in a way that changes from dense to sparse around it.

5. A light shield structure for an image acquisition device according to claim 4, characterized in that, It also includes a sponge (5) filled between the outer shell (1) and the roll (3), the pores of the sponge (5) being linear.

Images