A sensing limit type light shield device and a light shielding method

Abstract

The present application relates to the technical field of light shielding cover in optical machine, and particularly relates to a sensing limiting type light shielding cover device and a light shielding method. The sensing limiting type light shielding cover device comprises a base, a detection assembly, a driving assembly, a light shielding cover, a hollow pressure sensor and a lens barrel assembly. The detection assembly and the lens barrel assembly are both fixed on the base, and the hollow pressure sensor is installed on the support shell of the detection assembly. The lens barrel assembly and the hollow pressure sensor are arranged in a gap, so that the light beam passing through the lens barrel assembly is connected with the light path of the detection assembly. The power end of the driving assembly is installed on the inner wall of the support shell of the detection assembly. The transmission end of the driving assembly is in transmission connection with the light shielding cover sleeved on the outer wall of the lens barrel assembly, and the light shielding cover is in threaded connection with the outer wall of the lens barrel assembly. The present application has simple structure, and realizes accurate shielding of stray light through the cooperation of the gear driving mechanism and the hollow pressure sensor.

Description

Technical Field

[0001] This invention relates to the field of light shield technology in optical engines, specifically to a sensing and limiting light shield device and a light shielding method. Background Technology

[0002] The lens hoods used in existing lens barrels are generally divided into fixed lens hoods and adjustable lens hoods; among them, fixed lens hoods are difficult to adapt to diverse needs;

[0003] Adjustable lens hoods are easier to use due to their adjustability. For example, the most common shutter design is as follows: the lens hood includes a lamp tube, a rotatable lens hood covering the lamp tube, a rotating gear mounted on the lens hood, a drive gear and a motor that are linked to the rotating gear, with the drive gear mounted on the output shaft of the motor. When the motor is working, it drives the drive gear to rotate, which in turn drives the rotating gear to rotate, thus rotating the lens hood to achieve the exposure operation. However, since only one rotating gear drives the lens hood, the force on the lens hood is uneven, which can lead to misalignment. Moreover, the lens hood cannot be precisely positioned, making it impossible to control the exposure time and energy. Furthermore, the frequent rotation of the lens hood can easily cause it to break. To address these issues, existing technologies have proposed, for example, Chinese patents CN206411392U (titled "A Quick-Replaceable Dual-Sided Drive Lens hood") and CN216411834U (titled "A Novel Lens hood for Multiple Exposure Shooting"), to improve upon the uneven force distribution, inconvenient post-maintenance, and inability to perform multiple exposures in existing ordinary lens hood structures.

[0004] However, the examples above are only compatible with the shutter structure of cameras, meaning they are only suitable for traditional exposure requirements and cannot be adapted to other application structures to meet the needs of different optical parameters and environmental conditions.

[0005] Therefore, those skilled in the art urgently need to further improve existing light shield devices to meet the above requirements. Summary of the Invention

[0006] Therefore, the technical problem to be solved by the present invention is to overcome the defects existing in the prior art, thereby providing a sensing limiting light shield device and a light shielding method.

[0007] A sensing and limiting light shield device includes: a base, a detection component, a driving component, a light shield, a hollow pressure sensor, and a lens tube component;

[0008] Both the detection component and the lens assembly are fixed on the base, and the hollow pressure sensor is mounted on the support housing of the detection component; the lens assembly and the hollow pressure sensor are spaced apart to allow the light beam passing through the lens assembly to connect with the optical path of the detection component.

[0009] The power end of the drive component is mounted on the inner wall of the support housing of the detection component;

[0010] The drive end of the drive component is connected to the light shield sleeved on the outer wall of the lens barrel assembly, and the light shield is threadedly connected to the outer wall of the lens barrel assembly, so that under the action of the drive component, the light shield moves axially to block the light between the lens barrel assembly and the hollow pressure sensor.

[0011] Preferably, the drive assembly includes: a motor, a drive gear, a coupling, and a motor support frame;

[0012] The motor support frame for fixing the motor is installed on the inner wall of the support housing;

[0013] The motor's output end passes through the support housing and is connected to the drive gear via a coupling;

[0014] The driving gear meshes with the driven gear on the outer ring of the sunshade.

[0015] Preferably, the detection assembly includes: a detector and a support housing;

[0016] A stepped through hole at the same horizontal height as the lens barrel assembly is provided on the supporting housing;

[0017] Furthermore, inside the cavity of the supporting housing: the detector is fixed to the inner wall of the supporting housing and covers the through hole.

[0018] Preferably, the stepped through-hole has an outer larger and inner smaller structure;

[0019] One end of the hollow pressure sensor is placed in the outer through hole of the stepped through hole, and the sensing surface is close to the lens tube assembly.

[0020] Preferably, the detector's detection surface size is larger than the inner through-hole size of the stepped through-hole.

[0021] Preferably, the structural dimensions of one end of the light shield are adapted to the sensing surface dimensions of the hollow pressure sensor to form a light shielding structure;

[0022] Furthermore, the height of one end of the sunshade is greater than the height of the meshing connection between the active gear and the passive gear, thus forming a limiting structure.

[0023] A sensing-limiting light-shielding method, implemented using a sensing-limiting light-shielding cover device, specifically includes:

[0024] S1. Based on actual needs, the controller of the main device of the application issues instructions to control the motor to move in the forward or reverse direction;

[0025] S2. The main unit controller shuts down the motor based on the pressure signal received from the hollow pressure sensor.

[0026] The technical solution of this invention has the following advantages:

[0027] This invention relates to a light shield device based on a hollow pressure sensor. It achieves high-precision closed-loop control of the light shield displacement through pressure monitoring feedback, thereby suppressing stray light. Its structure ensures a seamless light shield seal in the light-shielding state, while the hollow pressure sensor feedback ensures balanced force to prevent light shield deformation, thus guaranteeing the stability of optical components and the lifespan of the system. Furthermore, the modular layout of the components is compatible with different optical instruments, and the motor and gear transmission enable automated adjustment.

[0028] The beneficial effects of this invention are demonstrated from the perspectives of optical performance, mechanical reliability, and engineering practicality. It provides an advanced and practical solution for optical instrument shading systems and has significant value for improving the imaging quality and expanding the functions of optical instruments in complex environments. Attached Figure Description

[0029] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0030] Figure 1 This is a schematic cross-sectional view of a light shield device based on a hollow pressure sensor in its unshielded state.

[0031] Figure 2 This is a schematic cross-sectional view of a light-shielding device based on a hollow pressure sensor in its light-shielding state.

[0032] Figure 3 This is an isometric view of a light shield device based on a hollow pressure sensor in its unshielded state.

[0033] Figure 4 This is an isometric view of the shading state of a light-shielding device based on a hollow pressure sensor.

[0034] Explanation of reference numerals in the attached figures:

[0035] 1-Base, 2-Support pad, 3-Support housing, 4-Detector, 5-Motor support frame, 6-Motor, 7-Adjusting pad, 8-Hollow pressure sensor, 9-Coupling, 10-Drive gear, 11-Light shield, 12-Mirror barrel, 13-Mirror barrel mounting bracket, 14-Mirror barrel support seat, 15-Mirror barrel support seat pad. Detailed Implementation

[0036] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0038] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0039] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0040] Example 1

[0041] Before detailing the structure of this embodiment, it should be noted that in the lens barrel structure of optical instruments such as microscopes, telescopes, or camera lenses, the light shield 11 is a key component ensuring optical performance. Its core function is to block stray light from outside the lens barrel structure, such as ambient light and reflected light, from entering the optical system, preventing stray light from interfering with the imaging optical path, thereby reducing aberrations and improving image clarity and contrast. However, in the prior art, the innovation mainly focuses on light shields used in shutter structures and wall washer lights, neglecting applications in other fields such as spaceborne applications. In these cases, simple light shield structures are not suitable because, for example, in shutter structures, most of the light beam is blocked from one end of the lens barrel structure to the other end of the detection mechanism, with insufficient protection against external stray light.

[0042] Therefore, in this embodiment, as follows Figure 1-4A sensing and limiting light shield device is disclosed, including: a base 1, a detection component, a driving component, a light shield 11, a hollow pressure sensor 8, and a lens tube component.

[0043] Both the detection component and the lens assembly are fixed on the base 1, and the hollow pressure sensor 8 is mounted on the support housing 3 of the detection component; the lens assembly and the hollow pressure sensor 8 are spaced apart so that the light beam passing through the lens assembly is connected to the optical path of the detection component.

[0044] The power end of the drive component is mounted on the inner wall of the support housing 3 of the detection component;

[0045] The drive end of the drive component is connected to the light shield 11 sleeved on the outer wall of the lens barrel assembly, and the light shield 11 is threadedly connected to the outer wall of the lens barrel assembly, so that under the action of the drive component, the light shield 11 moves axially to block the light between the lens barrel assembly and the hollow pressure sensor 8.

[0046] Specifically:

[0047] The lens barrel assembly includes: lens barrel 12, lens barrel fixing bracket 13, lens barrel support 14, and lens barrel support shim 15;

[0048] The lens barrel holder 13 and the lens barrel support 14 cooperate to clamp and fix the lens barrel 12, and the lens barrel 12 is fixed to the base 1 by the lens barrel support 14. The lens barrel support shim 15 is installed between the lens barrel support 14 and the base 1 to adjust the angle and height of the lens barrel support 14.

[0049] The outer wall of the lens barrel 12 has an external thread that matches the internal thread on the inner wall of the light shield 11.

[0050] In this embodiment, the drive assembly includes: a motor 6, a drive gear 10, a coupling 9, and a motor support frame 5;

[0051] The motor support frame 5 for fixing the motor 6 is installed on the inner wall of the support housing 3;

[0052] The output end of motor 6 passes through the support housing 3 and is connected to the drive gear 10 via coupling 9;

[0053] The drive gear 10 and the passive gear on the outer ring of the sunshade 11 mesh.

[0054] In this embodiment, the detection component includes: a detector 4 and a support housing 3;

[0055] A stepped through hole at the same horizontal height as the lens barrel assembly is provided on the support housing 3;

[0056] Furthermore, inside the cavity of the supporting housing 3: the detector 4 is fixed to the inner wall of the supporting housing 3 and covers the through hole. Further, in this embodiment, the detection assembly also includes a support shim 2 and an adjustment shim 7;

[0057] The support pad 2 is installed between the support housing 3 and the base 1 to adjust the angle and height of the support housing 3, and is fixed to the base 1 by screws.

[0058] In this embodiment, the detector 4 is specifically a rectangular detection surface, which is fixed to the support housing 3 by screws; the adjustment shim 7 is installed between the detector 4 and the stepped through hole of the support housing 3, which serves as the light inlet, to adjust the angle and height of the detector 4, and is fixed to the support housing 3 by screws.

[0059] The stepped through-hole has an outer larger and inner smaller structure;

[0060] One end of the hollow pressure sensor 8 is placed in the outer through hole of the stepped through hole, and the sensing surface is close to the lens tube assembly.

[0061] The detection surface size of detector 4 is larger than the inner through-hole size of the stepped through-hole. This outer-large-inner-small structure provides better protection for detector 4 or the lens assembly. This is because as long as the sensitivity of the hollow pressure sensor 8, motor 6, and the main device controller of the specific application meets the requirements, it can be ensured that motor 6 can be shut off in time when the light-shielding operation is completed. Moreover, even if the pressure redundancy applied by the light-shielding cover 11 to the hollow pressure sensor 8 will not affect the misaligned detection surface.

[0062] The structural dimensions of one end of the light shield 11 are adapted to the sensing surface dimensions of the hollow pressure sensor 8 to form a light shielding structure;

[0063] Furthermore, the height of one end of the light shield 11 is greater than the height of the meshing connection position of the active gear 10 and the passive gear set on the outer wall of the other end of the light shield 11, forming a limiting structure when the light is not shielded, preventing the light shield 11 from excessive displacement, which would cause the distance between the light shield 11 and the detection surface to exceed the preset threshold, affecting subsequent maintenance and light shielding accuracy.

[0064] Example 2

[0065] A sensing-limiting light-shielding method, implemented using a sensing-limiting light-shielding device according to Embodiment 1, specifically includes:

[0066] S1. According to actual needs, the main device controller of the application issues a command to control the motor 6 to move in the forward or reverse direction; specifically: when light blocking is required: based on the movement of the motor 6, the active gear 10 drives the passive gear to move, affected by the external thread of the lens barrel 12 and the internal thread of the light shield 11; so that the light shield 11 moves on the lens barrel 12 from a position away from the detection surface to the detection surface, until the light shield 11 is close to the hollow pressure sensor 8;

[0067] S2. The main unit controller shuts down the motor 6 based on the pressure signal received from the hollow pressure sensor 8.

[0068] Specifically:

[0069] This embodiment discloses a very simple implementation. In practical applications, the specific operation of the motor 6 can be precisely controlled according to a preset algorithm. In practical applications, the preset algorithm can be an algorithm that predicts based on the pressure signal from the hollow pressure sensor 8, depending on the actual needs.

[0070] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A sensing and limiting type light shield device, characterized in that, include: The base (1), detection assembly, drive assembly, light shield (11), hollow pressure sensor (8), and lens barrel assembly; The detection component and the lens tube component are both fixed on the base (1), and the hollow pressure sensor (8) is installed on the support housing (3) of the detection component; the lens tube component and the hollow pressure sensor (8) are spaced apart so that the light beam passing through the lens tube component and the optical path of the detection component are connected. The power end of the drive component is installed on the inner wall of the support housing (3) of the detection component; The drive end of the drive assembly is connected to the light shield (11) sleeved on the outer wall of the lens assembly, and the light shield (11) is threadedly connected to the outer wall of the lens assembly so that the light shield (11) moves axially under the action of the drive assembly to block the light between the lens assembly and the hollow pressure sensor (8). The drive components include: a motor (6), a drive gear (10), a coupling (9), and a motor support frame (5); The motor support frame (5) for fixing the motor (6) is installed on the inner wall of the support housing (3); The output end of the motor (6) passes through the support housing (3) and is connected to the drive gear (10) via a coupling (9); The drive gear (10) and the passive gear on the outer ring of the sunshade (11) mesh; The detection components include: a detector (4) and a support housing (3); A stepped through hole with the same horizontal height as the lens barrel assembly is provided on the supporting housing (3); Furthermore, inside the cavity of the supporting housing (3): the detector (4) is fixed to the inner wall of the supporting housing (3) and covers the through hole; The stepped through-hole has an outer larger and inner smaller structure; One end of the hollow pressure sensor (8) is placed in the outer through hole of the stepped through hole, and the sensing surface is close to the lens tube assembly; The structural dimensions of one end of the light shield (11) are adapted to the sensing surface dimensions of the hollow pressure sensor (8) to form a light shielding structure; Furthermore, the height of one end of the light shield (11) is greater than the height of the meshing connection between the active gear (10) and the passive gear, thus forming a limiting structure.

2. The sensing and limiting light shield device according to claim 1, characterized in that, The detection surface size of the detector (4) is larger than the inner through-hole size of the stepped through-hole.

3. A sensing-limiting light-blocking method, characterized in that, The application of the sensing and limiting light shield device according to claim 2 specifically includes: S1. Based on actual needs, the main device controller of the application issues instructions to control the motor (6) to move in the forward or reverse direction; S2. The main device controller shuts down the motor (6) based on the pressure signal received from the hollow pressure sensor (8).

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