Automatic aperture for eliminating large-aperture stray light
By introducing a light-blocking separator and an automatic aperture design with three stacked blades, the stray light problem caused by traditional aperture structures is solved, achieving efficient stray light elimination and image quality improvement, making it suitable for shooting in various illumination scenarios.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-22
- Publication Date
- 2026-04-14
AI Technical Summary
Traditional aperture structures cause stray light that affects image quality, especially in large apertures where stray light caused by light reflection cannot be effectively eliminated.
An automatic aperture design employs a light-blocking spacer and a three-blade stacking method. By setting a light-blocking spacer with a thickness of less than 0.05mm and stacking the upper and lower blades, combined with a solenoid valve driving the crank, the aperture is precisely controlled, reducing the aperture thickness and eliminating stray light.
It effectively reduces aperture thickness, decreases light reflection, improves image contrast and overall quality, and adapts to shooting needs in different lighting scenarios.
Smart Images
Figure CN224122876U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to an automatic aperture for eliminating stray light in a large aperture. Background Technology
[0002] In optical lenses, stray light refers to unexpected light that deviates from the ideal optical path and enters the imaging system. Stray light is superimposed on the image, causing the image to appear grayish, lose details in dark areas, and reduce overall contrast. For example, when shooting against the light, sunlight reflected inside the lens can create a halo or fogging effect. The causes of stray light are varied, mainly originating from: ① multiple reflections from the lens surface, filters, or sensor protective glass (e.g., producing "ghosting"); ② reflected light from internal lens mechanical structures (such as the lens barrel and aperture blades); ③ external stray light that enters the lens directly without passing through the main optical path (such as flare in backlit shooting).
[0003] To improve overall image quality, a light-blocking mechanism is typically used at the aperture to prevent light from passing through non-main light paths. Therefore, the choice of aperture for automatic apertures is particularly important. Traditional aperture blocking positions are usually formed by injection-molded structural components, stamped parts, and stacked blades. However, the minimum thickness along the optical axis for injection-molded structural components is 0.1mm, and for stamped parts it is 0.2mm. Since the wall thickness of injection-molded or stamped materials cannot be less than 0.1mm, high-energy light will create new reflections at the side walls, resulting in new stray light that affects the image. Furthermore, with the blade stacking method, due to the positioning of the magnetic valve and the assembly tolerances of the blades, the overlapping circles of the upper and lower blades cannot completely overlap, resulting in new stray light at the exposed corners.
[0004] Therefore, an automatic aperture with large aperture to eliminate stray light is needed. Utility Model Content
[0005] The purpose of this invention is to provide an automatic aperture for eliminating stray light in a large aperture. This automatic aperture introduces a light-blocking spacer paper, which effectively reduces the "thickness" of the aperture.
[0006] The technical solution of this utility model is as follows: an automatic aperture for eliminating stray light with a large aperture, including a fixed base and a cover plate. The fixed base is provided with a light-transmitting hole, and the cover plate is provided with a light-transmitting hole. An upper blade, a lower blade, and a light-blocking spacer are provided in the inner cavity formed by the fixed base and the cover plate fastening together. Both the upper blade and the lower blade are provided with light-transmitting slots. The light-blocking spacer is stacked with the upper blade and the lower blade. The light-blocking spacer is provided with a light-transmitting hole, and the thickness of the light-blocking spacer is <0.05mm.
[0007] Furthermore, the light-blocking spacer paper is disposed between the upper blade and the inner wall of the fixing base, and the lower blade is disposed on the front side of the upper blade.
[0008] Furthermore, upper channels are vertically formed on both sides of the upper blade and both sides of the upper blade, and lower channels are vertically formed on one side of the lower blade and the other side of the lower blade. Upper guide protrusions for passing through the upper channels are longitudinally fixed on both sides of the upper cavity of the fixed base, and lower guide protrusions for passing through the lower channels are longitudinally fixed on both sides of the upper cavity of the housing.
[0009] Furthermore, the lower blade is disposed on the rear or front side of the upper blade, and the lower side of the lower blade has a first extension that protrudes downward and is used to open a lower channel, and the other side of the lower part of the upper blade has a second extension that protrudes downward and is used to open a lower channel.
[0010] Furthermore, the light-blocking spacer paper is connected and positioned to the fixing base via a pair of upper guide protrusions; the inner wall of the fixing base is provided with a slide rail for resting against the blade.
[0011] Furthermore, the lower part of the fixed base is provided with an installation groove and a solenoid valve can be detachably installed. A rocker arm is installed on the valve core of the solenoid valve. One end of the rocker arm is movably connected to one side of the lower blade, and the other end of the rocker arm is movably connected to the other side of the lower part of the upper blade.
[0012] Furthermore, a first transverse groove is provided on one side of the lower blade, and a second transverse groove is provided on the other side of the lower blade. The middle part of the crank is rotatably connected to the housing, and the two ends of the crank are respectively provided with shafts for passing through the first transverse groove and the second transverse groove. The front end of each shaft is fixed with an anti-detachment protrusion.
[0013] Furthermore, the solenoid valve is pre-fixed to the mounting base via a snap-fit structure, and a PCB board is soldered to the output pin position of the solenoid valve.
[0014] Furthermore, the light-blocking spacer paper is made of Kimoto material, and the surface of the light-blocking spacer paper is coated with a dendritic carbon nanotube coating; the upper blade and the lower blade are both made of Kimoto material.
[0015] Furthermore, the fixing base and the cover plate are provided with several matching snap-fit structures on both sides, and the lower two sides of the fixing base are provided with outwardly protruding mounting bosses; the cover plate is provided with a sliding groove for assembling the ND Filter.
[0016] Compared with the prior art, the present invention has the following advantages:
[0017] 1. This automatic aperture incorporates a light-blocking spacer, located between the upper blade and the mounting base. By stacking and fixing the spacer, it matches the aperture setting in the optical design, effectively reducing the aperture's "thickness." Furthermore, the use of the light-blocking spacer, typically 0.01~0.03mm thick, essentially eliminates the thickness along the optical axis, allowing the concentrated beam of light to pass directly through the aperture without generating new reflections.
[0018] 2. The automatic aperture uses a three-blade stacking method for fixation. The spacer paper is fixed in position by the blade positioning post of the fixing base. Compared with the center offset caused by the spacer paper being applied to the surface of the top cover / fixing base, this method better positions the center of the light-blocking spacer paper's aperture to match the optical axis of the lens. Attached Figure Description
[0019] Figure 1 This is a schematic diagram of the structure of the present invention. Figure 1 ;
[0020] Figure 2 This is a schematic diagram of the structure of the present invention. Figure 2 ;
[0021] Figure 3 This is an exploded view of the present invention;
[0022] Figure 4 This is a schematic diagram of the structure of the solenoid valve of this utility model;
[0023] Figure 5 This is a schematic diagram of the crank component of this utility model;
[0024] In the diagram: 10-Fixed base; 11-Light-transmitting hole in the base shell; 12-Upper guide protrusion; 13-Lower guide protrusion; 14-Slide rail; 15-Mounting boss; 20-Cover plate; 21-Light-transmitting hole in the cover plate; 22-Snap-on structure; 23-Sliding groove; 30-Upper blade; 31-Light-transmitting slot; 32-Upper channel; 33-Lower channel; 34-Second extension; 35-Second transverse groove; 40-Lower blade; 41-Light-transmitting slot; 42-Upper channel; 43-Lower channel; 44-First extension; 45-First transverse groove; 50-Solenoid valve; 51-PCB board; 60-Handle component; 61-Shaft; 62-Anti-detachment protrusion; 70-Light-blocking spacer paper; 71-Light-transmitting hole in the spacer paper. Detailed Implementation
[0025] To make the above-mentioned features and advantages of this utility model more easily understood, specific embodiments are described below in conjunction with the accompanying drawings, but this utility model is not limited thereto.
[0026] refer to Figures 1 to 5
[0027] An automatic aperture for eliminating stray light with a large aperture includes a fixed base 10 and a cover plate 20. The fixed base is provided with a housing light-transmitting hole 11, and the cover plate is provided with a cover plate light-transmitting hole 21. An upper blade 30 and a lower blade 40 and a light-blocking spacer 70 are provided in the inner cavity formed by the fixed base and the cover plate fastening together. The upper blade is provided with a V-shaped light-transmitting slot 31 with the opening facing downward, and the lower blade is provided with a V-shaped light-transmitting slot 41 with the opening facing downward. The light-blocking spacer is stacked with the upper blade and the lower blade. The light-blocking spacer is provided with a paper-blocking light-transmitting hole 71. The thickness of the light-blocking spacer is <0.05mm.
[0028] In this embodiment, to achieve vertical sliding and guiding of the upper and lower blades within the housing, upper channels 32 and 42 are vertically formed on both upper sides of the upper blade and both upper sides of the lower blade. Lower channels 33 and 43 are vertically formed on one lower side of the lower blade and the other lower side of the upper blade. Upper guide protrusions 12 for passing through the upper channels are longitudinally fixed on both upper sides of the inner cavity of the fixed base, and lower guide protrusions 13 for passing through the lower channels are longitudinally fixed on both upper sides of the inner cavity of the housing. The upper and lower channels are of equal length. By cooperating between the upper channel and the upper guide protrusion, and between the lower channel and the lower guide protrusion, the lifting, guiding, and limiting of the upper and lower blades are achieved.
[0029] In this embodiment, the lower blade is disposed behind or in front of the upper blade and is close to it. One side of the lower blade has a first extension 44 protruding downwards for forming a lower channel, and the other side of the lower part of the upper blade has a second extension 34 protruding downwards for forming a lower channel. This structure helps save material and avoids interference during lifting and lowering movements. Furthermore, the first and second extensions allow for better connection with the crank arm of the solenoid valve.
[0030] In this embodiment, the light-blocking spacer is disposed between the upper blade and the inner wall of the fixing base, and the light-blocking spacer is connected and positioned to the fixing base via a pair of upper guide protrusions. The lower blade is disposed on the front side of the upper blade. The inner wall of the fixing base is provided with a slide rail 14 for resting against the blade.
[0031] In this embodiment, the lower part of the fixed base is provided with a mounting groove and a solenoid valve 50 is detachably mounted thereon. A rocker arm 60 is mounted on the valve core of the solenoid valve. One end of the rocker arm is movably connected to one side of the lower blade, and the other end of the rocker arm is movably connected to the other side of the lower part of the upper blade. The valve core of the solenoid valve drives the rocker arm to rotate, and the rotation of the rocker arm drives the upper and lower blades to move.
[0032] Specifically, a first transverse groove 45 is formed on one side of the lower blade (first extension), and a second transverse groove 35 is formed on the other side of the lower blade (second extension). The middle part of the crank is rotatably connected to the housing, and the two ends of the crank are respectively provided with shaft portions 61 for passing through the first and second transverse grooves. Thus, by rotating the crank, the shaft portions drive the upper and lower blades to move. The front end of each shaft portion is fixed with an anti-detachment protrusion 62, which helps to prevent the shaft portion from detaching from the first and second transverse grooves.
[0033] In this embodiment, the solenoid valve is pre-fixed to the mounting base via a snap-fit structure, and a PCB board 51 is soldered to the output pin of the solenoid valve.
[0034] In this embodiment, the solenoid valve also includes a magnet, a fixed shaft, enameled wire, etc.
[0035] In this embodiment, the light-blocking spacer is made of Kimoto (light-blocking film), and its surface is coated with a dendritic carbon nanotube layer, which helps to further reduce the reflectivity to below 0.2%. The thickness of the light-blocking spacer is typically 0.01~0.03mm, which essentially eliminates the thickness along the optical axis, allowing the energy-concentrated beam of light to pass directly through the aperture without generating new reflections. Preferably, the thickness is 0.03mm.
[0036] In this embodiment, the thickness of both the upper and lower blades is 0.06mm to 0.08mm, and the material is Kimoto (light-shielding film).
[0037] In this embodiment, the effective light-transmitting diameter of the light-blocking spacer is 6.5 mm, the effective light-transmitting diameter of the fixing base is 8.1 mm, and the effective light-transmitting diameter of the cover plate is 8.3 mm.
[0038] In this embodiment, both sides of the fixing seat and the cover plate are provided with a plurality of cooperating snap-fit structures 22, and both sides of the lower part of the fixing seat are provided with outwardly protruding mounting bosses 15. The fixing seat is injection molded, which is cost-effective and efficient.
[0039] In this embodiment, the cover plate is provided with a sliding groove 23 for assembling the ND Filter, so as to extend the dynamic range (supporting ND2-ND1000 filters) and adapt to illuminance scenes from 10^5 Lux to 10^-2 Lux.
[0040] Unless otherwise stated, if any of the technical solutions disclosed in this utility model discloses a numerical range, then the disclosed numerical range is a preferred numerical range. Any person skilled in the art should understand that the preferred numerical range is merely one among many feasible numerical values that has a more obvious or representative technical effect. Because there are many numerical values, it is impossible to list them all. Therefore, this utility model discloses only some numerical values to illustrate the technical solutions of this utility model. Furthermore, the numerical values listed above should not constitute a limitation on the scope of protection of this utility model.
[0041] If the terms "first" or "second" are used in this document to specify components, those skilled in the art should know that the use of "first" or "second" is merely for the purpose of distinguishing components in description, and unless otherwise stated, the above terms have no special meaning.
[0042] If this utility model discloses or relates to mutually fixedly connected parts or structural components, then unless otherwise stated, a fixed connection can be understood as: a detachable fixed connection (e.g., using bolts or screws) or a non-detachable fixed connection (e.g., riveting or welding). Of course, mutually fixed connections can also be replaced by an integral structure (e.g., manufactured using a casting process) (except where it is obviously impossible to use an integral forming process).
[0043] In addition, unless otherwise stated, the terms used to indicate positional relationships or shapes in any of the technical solutions disclosed in this utility model above include states or shapes that are similar to, close to, or approximate with them.
[0044] Any component provided by this utility model can be assembled from multiple individual components, or it can be a single component manufactured by a one-piece molding process.
[0045] The above description is only a preferred embodiment of the present utility model. All equivalent changes and modifications made within the scope of the patent application of the present utility model shall be covered by the present utility model.
Claims
1. An automatic aperture for eliminating stray light in a large aperture, comprising a fixed base and a cover plate, wherein the fixed base is provided with a housing light-transmitting hole, and the cover plate is provided with a cover plate light-transmitting hole, characterized in that, The inner cavity formed by the fastening of the fixing seat and the cover plate is provided with an upper blade, a lower blade, and a light-blocking spacer. Both the upper blade and the lower blade are provided with light-transmitting slots. The light-blocking spacer is stacked with the upper blade and the lower blade. The light-blocking spacer is provided with light-transmitting holes. The thickness of the light-blocking spacer is <0.05mm.
2. The automatic aperture for eliminating large-aperture stray light according to claim 1, characterized in that, The light-blocking spacer is disposed between the upper blade and the inner wall of the fixing base, and the lower blade is disposed in front of the upper blade.
3. An automatic aperture for eliminating large-aperture stray light according to claim 1 or 2, characterized in that, The upper blade and the lower blade are vertically provided with upper channels on both sides of the upper part, and the lower blade is vertically provided with lower channels on one side of the lower part and the other side of the lower part of the upper blade. The upper guide protrusions for passing through the upper channels are longitudinally fixed on both sides of the upper part of the inner cavity of the fixed seat, and the lower guide protrusions for passing through the lower channels are longitudinally fixed on both sides of the upper part of the inner cavity of the housing.
4. The automatic aperture for eliminating large-aperture stray light according to claim 3, characterized in that, The lower blade is disposed on the rear or front side of the upper blade. The lower part of the lower blade has a first extension that protrudes downward and is used to open a lower channel on one side. The lower part of the upper blade has a second extension that protrudes downward and is used to open a lower channel on the other side.
5. An automatic aperture for eliminating stray light in a large aperture according to claim 3, characterized in that, The light-blocking spacer paper is connected and positioned to the fixed base via a pair of upper guide protrusions; the inner wall of the fixed base is provided with a slide rail for resting against the blade.
6. An automatic aperture for eliminating large-aperture stray light according to claim 1, 2, 4 or 5, characterized in that, The lower part of the fixed base is provided with an installation groove and a solenoid valve can be detachably installed. A rocker arm is installed on the valve core of the solenoid valve. One end of the rocker arm is movably connected to one side of the lower blade, and the other end of the rocker arm is movably connected to the other side of the lower part of the upper blade.
7. An automatic aperture for eliminating stray light in a large aperture according to claim 6, characterized in that, The lower blade has a first transverse groove on one side of its lower part, and the upper blade has a second transverse groove on the other side of its lower part. The middle part of the crank is rotatably connected to the housing. The two ends of the crank are respectively provided with shafts for passing through the first transverse groove and the second transverse groove. The front end of each shaft is fixed with an anti-detachment protrusion.
8. An automatic aperture for eliminating stray light in a large aperture according to claim 6, characterized in that, The solenoid valve is pre-fixed to the mounting base via a snap-fit structure, and a PCB board is soldered to the output pins of the solenoid valve.
9. An automatic aperture for eliminating stray light in a large aperture as described in claim 1, 2, 4, 5, 7, or 8, characterized in that, The light-blocking spacer paper is made of Kimoto material, and the surface of the light-blocking spacer paper is coated with a dendritic carbon nanotube coating; the upper blade and the lower blade are both made of Kimoto material.
10. An automatic aperture for eliminating large-aperture stray light according to claim 1, characterized in that, The fixing base and the cover plate are provided with several matching buckle structures on both sides, and the lower two sides of the fixing base are provided with outwardly protruding mounting bosses; the cover plate is provided with a sliding groove for assembling the ND Filter.