Neutral density filter, photographing device, photographing system, and photographing system control method

Abstract

A neutral density filter (1), comprising: a neutral density filter body (11); a mounting portion (12) arranged on the neutral density filter body (11) and configured to be mechanically connected to an external lens, so as to detachably assemble the neutral density filter body (11) to the lens; and a first communication portion (13) configured to electrically connect, by means of the lens, the neutral density filter body (11) to a photographing device equipped with the lens, wherein when the neutral density filter body (11) is assembled on the lens by means of the mounting portion (12), the neutral density filter body (11) receives a control signal by means of the first communication portion (13), the control signal being used for adjusting optical parameters of the neutral density filter body (11). Also provided are a photographing device, a photographing system, and a photographing system control method.

Description

Neutral density filter, shooting equipment, shooting system, and control methods of the shooting system Technical Field

[0001] This disclosure relates to the field of optical device technology, and in particular to a neutral density filter, an imaging device, an imaging system, and a control method for the imaging system. Background Technology

[0002] A neutral density (ND) filter, also known as a neutral density filter or simply a gray filter, is a photographic filter used to reduce the amount of light entering a camera. Its main function is to allow users to use longer shutter speeds in bright light conditions, thus achieving specific photographic effects. Based on their adjustment method, ND filters are divided into manual ND filters and electronic ND filters. Manual ND filters allow for non-continuous adjustment in increments according to the light reduction level, while electronic ND filters offer rapid, stepless adjustment. Therefore, electronic ND filters are not only easier to operate than manual ND filters but also meet the needs for more precise exposure control.

[0003] Currently, electronic neutral density (ND) filters need to be electrically connected to the shooting equipment via a dedicated interface to draw power from a special power adapter. This not only makes their structure complex but also makes assembly with the shooting equipment rather cumbersome. Summary of the Invention

[0004] To address at least one of the above-mentioned and other technical problems in the prior art, this disclosure provides a neutral density filter, an imaging device, an imaging system, and a control method for the imaging system. The neutral density filter is mounted on a lens via a mounting part and is powered by the imaging device mounted on the lens via a first communication part, which makes the structure of the neutral density filter more compact and easier to assemble.

[0005] The first aspect of this disclosure provides a neutral density (ND) filter, comprising: an ND filter body; a mounting portion disposed on the ND filter body and configured to be mechanically connected to an external lens for detachably mounting the ND filter body to the lens; and a first communication portion configured to electrically connect the ND filter body to an imaging device mounted on the lens via the lens; wherein, when the ND filter body is mounted to the lens via the mounting portion, the ND filter body receives a control signal via the first communication portion, the control signal being used to adjust the optical parameters of the ND filter body.

[0006] A second aspect of this disclosure provides a shooting device, comprising: a camera body; a lens disposed on the camera body and having a second communication unit configured to be electrically connected to the camera body; wherein, when a neutral density filter body is mounted on the lens, the second communication unit is electrically connected to a first communication unit of the neutral density filter body to output a control signal to the first communication unit.

[0007] A third aspect of this disclosure provides a shooting system, comprising: a camera body; a lens disposed on the camera body and having a second communication unit configured to be electrically connected to the camera body; a neutral density (ND) filter body; a mounting portion disposed on the ND filter body and configured to be mechanically connected to an external lens for detachably mounting the ND filter body to the lens; and a first communication unit configured to electrically connect the ND filter body to an shooting device mounted on the lens via the lens; wherein, when the ND filter body is mounted to the lens via the mounting portion, the ND filter body receives a control signal output from the second communication unit via the first communication unit, the control signal being used to adjust the optical parameters of the ND filter body.

[0008] A fourth aspect of this disclosure provides a control method for an imaging system, the imaging system comprising: a neutral density filter body with two electrodes, a signal generation circuit, a control circuit, and an interaction unit; the control method comprising: the signal generation circuit being configured to generate a first periodic signal and a second periodic signal according to predetermined parameters, wherein the first periodic signal and the second periodic signal have a predetermined phase difference relative to each other; the control circuit being configured to, in response to a user operation on the interaction unit, adjust the duty cycle of the first periodic signal to obtain a first adjustment signal, adjust the second periodic signal to obtain a second adjustment signal, and, based on the first adjustment signal and the second adjustment signal, control the voltage of the two electrodes of the neutral density filter body, thereby adjusting the transmittance of the neutral density filter body.

[0009] As can be seen from the illustrative embodiments of this disclosure, the neutral density filter body is detachably connected to the lens via a mounting part. When mounted on the lens, the first communication part electrically connects the neutral density filter body to the imaging device with the lens mounted on it through the lens, making it easier to assemble the neutral density filter with the lens and the imaging device. Furthermore, since the neutral density filter body draws power directly from the imaging device via the lens through the first communication part, the structure of the neutral density filter is more rational and compact. Attached Figure Description

[0010] Figure 1 is a schematic structural diagram of a neutral density filter according to an exemplary embodiment of the present disclosure;

[0011] Figure 2 shows the usage state of the neutral density filter shown in Figure 1 when a voltage of 0 volts is applied to the filter body.

[0012] Figure 3 is a diagram showing the usage state of the neutral density filter shown in Figure 1 with a small first voltage applied to the filter body;

[0013] Figure 4 is a diagram showing the usage state of the neutral density filter shown in Figure 1 under which a large second voltage is applied to the filter body.

[0014] Figure 5 is a schematic structural diagram of an ND mirror according to another illustrative embodiment of the present disclosure, showing a conductive element with a square ring structure;

[0015] Figure 6 is a schematic structural diagram of a neutral density filter according to another illustrative embodiment of the present disclosure, showing the locking mechanism;

[0016] Figure 7 is a schematic structural diagram of a shooting device according to an illustrative embodiment of the present disclosure;

[0017] Figure 8 is a schematic structural diagram of an imaging system according to an illustrative embodiment of the present disclosure;

[0018] Figure 9 is a schematic diagram of the module connection relationship of one embodiment of the shooting system shown in Figure 8;

[0019] Figure 10 is a module connection diagram of another schematic embodiment of the shooting system shown in Figure 8;

[0020] Figure 11 is a schematic circuit module diagram of an embodiment of the imaging system shown in Figure 8;

[0021] Figure 12 is a schematic circuit module diagram of another illustrative embodiment of the imaging system shown in Figure 8;

[0022] Figure 13 is a flowchart of a control method for a shooting system according to an illustrative embodiment of the present disclosure.

[0023] In the accompanying drawings, the reference numerals have the following specific meanings: 1. Neutral density filter; 11. Neutral density filter body; 111. First substrate; 112. First electrode; 113. First alignment layer; 114. Liquid crystal molecule; 115. Dye molecule; 116. Chiral molecule; 117. Second alignment layer; 118. Second electrode; 119. Second substrate; 12. Mounting part; 121. Frame; 122. First adsorption element; 123. Engaging element; 13. First communication part; 131. First conductive element; 132. Second conductive element; 133. Third conductive element; 134. Fourth conductive element; 135. Fifth conductive element; 14. First driving part; 2. Shooting equipment; 21. Camera body; 211. First control unit; 2111. Signal generation circuit; 21111. Signal generation unit; 21112. Frequency division unit; 21113. AND gate unit; 2112. Control circuit; 21121. Control unit; 21122. First load switch; 21123. Second load switch; 21124. First operational amplifier unit; 21125. Second operational amplifier unit; 212. Third communication unit; 22. Lens; 221. Second communication unit; 2211. Grounding contact; 2212. Control contact; 2213. Third power contact; 2214. First power contact; 2215. Second power contact; 222. Second suction element; 223. Second control unit; 224. Lens drive unit; 225. Second drive unit. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this disclosure clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings.

[0025] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this disclosure. The terms “comprising,” “including,” etc., as used herein indicate the presence of the stated features, steps, operations, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, or components.

[0026] All terms used herein, including technical and scientific terms, have the meanings commonly understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein are to be interpreted in a manner consistent with the context of this specification, and not in an idealized or overly rigid way.

[0027] When using expressions such as "at least one of A, B, and C," the meaning should generally be interpreted according to the understanding of someone skilled in the art. For example, "a system having at least one of A, B, and C" should include, but is not limited to, systems having A alone, having B alone, having C alone, having A and B, having A and C, having B and C, and / or having A, B, and C. Similarly, when using expressions such as "at least one of A, B, or C," the meaning should generally be interpreted according to the understanding of someone skilled in the art. For example, "a system having at least one of A, B, or C" should include, but is not limited to, systems having A alone, having B alone, having C alone, having A and B, having A and C, having B and C, and / or having A, B, and C.

[0028] The neutral density filter, imaging device, imaging system, and control method of the imaging system disclosed herein will be described in detail below with reference to the accompanying drawings. Unless otherwise specified, the features of the following embodiments and implementation methods can be combined with each other.

[0029] Example 1

[0030] Referring to Figures 1 to 6, this disclosure provides a neutral density (ND) filter 1, including an ND filter body 11, a mounting portion 12, and a first communication portion 13 (including but not limited to the conductive components described below). The mounting portion 12 is disposed on the ND filter body 11 and configured to be mechanically connected to an external lens to detachably mount the ND filter body 11 onto the lens. The first communication portion 13 is configured to electrically connect the ND filter body 11 to an imaging device with the mounted lens via the lens. When the ND filter body 11 is mounted on the lens via the mounting portion 12, the ND filter body 11 receives a control signal via the first communication portion 13. The control signal is used to adjust the optical parameters of the ND filter body 11.

[0031] In this embodiment, the neutral density filter body 11 is detachably connected to the lens via the mounting part 12. When mounted on the lens, the first communication part 13 (including but not limited to the conductive components described below) electrically connects the neutral density filter body 11 to the imaging device with the lens mounted on it via the lens. That is, when the neutral density filter body 11 is connected to the lens via the mounting part, the first communication part 13 can be simultaneously electrically connected to the imaging device (with the lens mounted) via the lens, making it easier to assemble the neutral density filter 1 with the lens and the imaging device. Furthermore, the neutral density filter 1 is directly powered by the electrically connected imaging device (in addition to receiving power from the imaging device 2, it also receives communication signals, such as analog signals and / or digital signals), eliminating the need for an additional power adapter. This also makes the structure of the neutral density filter more rational and compact.

[0032] Referring to Figures 2 to 4, in some illustrative embodiments, optical parameters include, but are not limited to, the transmittance of the neutral density filter body 11.

[0033] Referring to Figures 2 to 4, in some illustrative embodiments, the neutral density filter body 11 includes two electrodes (i.e., the first electrode 112 and the second electrode 118 described below) and a liquid crystal layer. The two electrodes are stacked and spaced apart. The liquid crystal layer is disposed between the two electrodes. The liquid crystal layer has dye molecules 115, which are configured to adjust their orientation in response to different electric field intensities generated by the electrodes to change the transmittance of the neutral density filter body. The electrodes are made of a transparent conductive material, including but not limited to indium tin oxide.

[0034] Referring to Figures 2 to 4, in some illustrative embodiments, the neutral density filter body 11 further includes two substrates (i.e., the first substrate 111 and the second substrate 119 described below). The two substrates are arranged in parallel and spaced apart, and a liquid crystal layer is formed between the two substrates. The substrates are made of a light-transmitting material.

[0035] Referring to Figures 2 to 4, in some illustrative embodiments, the neutral density filter body 11 includes a first substrate 111 and a second substrate 119 stacked and spaced apart. Specifically, the first substrate 111 and / or the second substrate 119 may include, but are not limited to, glass substrates. Further, a first electrode 112 and a first alignment layer 113 are stacked on the surface of the first substrate 111 facing the second substrate 119 (i.e., the lower surface of the first substrate 111 as shown in Figure 2). Similarly, a second electrode 118 and a second alignment layer 117 are sequentially stacked on the surface of the second substrate 119 facing the first substrate 111. The first alignment layer 113 and the second alignment layer 117 are, but are not limited to, coated on the first substrate 111 or the second substrate 119 to form a thin film, thereby giving the liquid crystal molecules 114 an initial orientation and orderly arrangement.

[0036] Referring to Figures 2 to 4, in some illustrative embodiments, a liquid crystal layer is disposed between the first alignment layer 113 and the second alignment layer 117. Specifically, this liquid crystal layer mainly comprises liquid crystal molecules 114 (such as positive liquid crystal molecules), dye molecules 115 (such as dichroic dyes), and chiral molecules 116 (i.e., molecules having one or more chiral centers, such as carbon atoms connected to four different atoms or groups). The liquid crystal molecules 114, dye molecules 115, and chiral molecules 116 are substantially uniformly mixed to form the liquid crystal layer.

[0037] Referring to FIG2, when a voltage of 0 volts (V) is applied to the first electrode 112 and the second electrode 118 (which can be considered as no voltage being applied to the first electrode 112 and the second electrode 118), the liquid crystal molecules 114 are initially aligned under the action of the chiral molecules 116, the first alignment layer 113, and the second alignment layer 117. That is, the liquid crystal molecules 114 are spirally arranged along a spiral axis orthogonal to the substrate (i.e., the first substrate 111 and the second substrate 119) (the up-down direction as shown in FIG2), and have a planar texture. At the same time, the dye molecules 115 are spirally arranged in a plane parallel to the substrate, thereby absorbing incident light from all directions, so that the neutral density filter body 11 is in a dark state with the lowest light transmittance.

[0038] Referring to Figure 3, when a first voltage (V1) greater than 0 volts (V) is applied to the first electrode 112 and the second electrode 118, the electric field force applied by the first electrode 112 and the second electrode 118 to the liquid crystal molecule 114 overcomes the helical torsional force of the chiral molecule 116, causing the liquid crystal molecule 114 to rotate along a preset angle, thereby causing the dye molecules 115 in the liquid crystal layer to form a uniform helical structure arrangement, so as to allow part of the incident light (which has a suitable incident angle) to pass through the neutral density filter body 11, so that the neutral density filter body 11 is in a brighter state with higher light transmittance.

[0039] Referring to FIG4, when a second voltage (i.e., V2) greater than the first voltage (i.e., V1) is applied to the first electrode 112 and the second electrode 118, the electric field force applied by the first electrode 112 and the second electrode 118 to the liquid crystal molecule 114 continues to increase, causing the liquid crystal molecule 114 to unwind and form a field-induced nematic phase. The liquid crystal molecule 114 induces the dye molecule 115 to be arranged in a direction orthogonal to the substrate (i.e., the first substrate 111 and the second substrate 119), so that the light absorption rate of the dye molecule 115 to the incident light is minimized, so that the neutral density filter body 11 is in the brightest state with the highest light transmittance.

[0040] Based on this, when the voltage applied to the first electrode 112 and the second electrode 118 is greater than 0V and less than the second voltage, the transmittance of the neutral density filter body 11 can be steplessly adjusted with the change of voltage (i.e., with the magnitude of the voltage).

[0041] Referring to FIG1, in some illustrative embodiments, the first communication unit 13 is disposed on the mounting unit 12 and is electrically connected to two electrodes (i.e., the first electrode 112 and the second electrode 118).

[0042] Referring to FIG1, in some illustrative embodiments, the first communication unit 13 includes a conductive element. The conductive element is disposed on the end face of the mounting unit 12 facing the lens.

[0043] Referring to Figures 2 to 4, which illustrate the principle of adjusting the light transmittance of the neutral density filter body 11, the first communication unit 13 (i.e., the conductive element) is made of a conductive material (such as copper or other metal materials) and is configured to connect to the first electrode 112 and the second electrode 118, respectively. Specifically, the first communication unit 13 is connected to the first electrode 112 and / or the second electrode 118 via welding, pressing, insertion, bonding, wrapping, integral formation, or any other method that allows current to flow between the first communication unit 13 and the first electrode 112 (and the second electrode 118). Furthermore, the first communication unit 13 is disposed on the end face facing the lens; that is, when the neutral density filter 1 is connected to the lens via the mounting part 12, the first communication unit 13 also abuts against the lens (hereinafter referred to as the second communication unit) to form an electrical connection with the imaging device through the lens, thereby allowing the neutral density filter 1 to draw power from the imaging device to apply an adjustable voltage to the two electrodes.

[0044] Referring to Figures 1 and 5, in some illustrative embodiments, the mounting portion 12 includes a frame 121. The neutral density filter body 11 is disposed in the middle of the frame 121.

[0045] In some illustrative embodiments, to adapt to the different external shapes of different lenses, the lens frame 121 can be configured to have a shape that is approximately the same as the lens shape. For example, for a lens with a generally cylindrical shape, the lens frame 121 is configured to be circular (see Figure 1); or, for a lens with a generally cubic shape (where the lens still uses circular optical lenses, but a square frame is configured on the outside of the optical lenses to prevent impact damage and / or facilitate sealing), the lens frame 121 is configured to be square (see Figure 5). In this way, when the neutral density filter is mounted on the lens, the front end of the lens can be completely covered, thereby preventing light leakage.

[0046] Referring to Figures 1 and 5, in some illustrative embodiments, the neutral density filter body 11 is connected to the center of the lens frame 121. Specifically, the center line of the neutral density filter body 11 should coincide with the center line of the lens frame 121, and when the neutral density filter 11 is mounted on the lens, the center line of the neutral density filter body 11 should coincide with the extension line of the optical axis of the lens. In detail, the neutral density filter body 11 can be connected to the lens frame 121 by means including but not limited to adhesive bonding, mechanical fixing (such as clamping and pressure ring fixing), welding, molding, welding, and any other suitable method for connecting the neutral density filter body 11 to the lens frame 121.

[0047] Referring to Figures 1 and 5, in some illustrative embodiments, the conductive elements include, but are not limited to, being configured as a ring structure.

[0048] Referring to FIG1, in some illustrative embodiments, the conductive element is configured as a ring structure.

[0049] Referring to FIG5, in some other illustrative embodiments, the conductive element is configured as a square ring structure.

[0050] Referring to Figures 1 and 5, in some illustrative embodiments, to adapt to different shapes of the lens frame 121 (such as the circular or square shapes described above), the conductive element is also configured to have a shape similar to that of the lens frame 121. For example, if the lens frame 121 is circular, the conductive element is also configured with a similar circular structure and is disposed on the end face of the lens frame 121 facing the lens. Specifically, the lens frame 121 and the conductive element can form a printed circuit board (PCB), that is, the lens frame 121 serves as the substrate of the PCB. A conductive layer is disposed within the lens frame 121 for connecting the first electrode 112 and the second electrode 118 of the neutral density filter body 11; the conductive element is electrically connected to the conductive layer and exposed on the end face of the lens frame 121. The portion of the conductive element exposed on the lens frame 121 can be configured to be flush with the end face of the lens frame 121 facing the lens, or slightly protruding or slightly recessed from that end face. It should be understood that the embodiments of this disclosure are not limited thereto.

[0051] For example, the lens frame 121 and the conductive element can also be made of a flexible printed circuit (FPC). The lens frame 121 can be made of an insulating film (such as polyimide film or polyester film), and the conductive element can be formed into a circuit design and connected to the insulating film by adhesives or other means. This use of a printed circuit board allows for a thinner and lighter overall design of the lens frame 121. In this embodiment, when the neutral density filter 1 is mounted on the lens, since the conductive element is annular, the electrical connection between the neutral density filter 1 and the lens can be achieved simply by designing the position of the conductive element relative to the lens (i.e., aligning the position of the conductive element with the position of the second communication section provided on the lens, as will be described in the following embodiments).

[0052] Referring to Figure 1, for a circular lens, since the conductive element is also a circular structure, the second communication unit provided on the lens can achieve electrical connection with the conductive element regardless of any circumferential position it comes into contact with, thereby enabling circuit connection with the electrodes of the neutral density filter body 11.

[0053] Similarly, referring to Figure 5, for a square lens, assuming the top edge of the lens is the first edge, the frame 121 of the neutral density filter 1 has four second edges connected end-to-end. Since the conductive element is a square ring structure, when assembling the neutral density filter 1 onto the lens, making any one of the second edges of the frame 121 parallel to the first edge will allow the second communication part of the lens to abut against the conductive element, thereby achieving electrical connection. In this way, since the user does not need to assemble the neutral density filter 1 and the lens at a specific position (such as a specific angle), the assembly operation can be simplified, and the assembly time of the neutral density filter 1 and the lens can be shortened. It should be understood that the embodiments of this disclosure are not limited thereto.

[0054] For example, for a neutral density filter 1 with a ring structure for the frame 121, the conductive component can adopt a polygonal ring structure (such as hexagon, octagon, decagon, etc.).

[0055] For example, if the lens frame 121 is a square ring structure (or other polygonal ring structure), the conductive component can be a circular ring structure. That is to say, the shape of the conductive component is not required to be consistent with the shape of the lens frame 121 and / or the external shape of the lens. Specifically, the conductive component should meet the user's requirement that the neutral density filter 1 does not need to be assembled with the lens in a specific position (such as a specific angle).

[0056] In some illustrative embodiments, the first communication unit 13 includes a plurality of conductive elements. The plurality of conductive elements are spaced apart around the center point of the neutral density filter body 11.

[0057] For example, as shown in FIG1, in some illustrative embodiments, the first communication unit 13 includes at least three conductive elements.

[0058] For example, as shown in FIG5, in some other illustrative embodiments, the first communication unit 13 includes at least two conductive elements.

[0059] In some illustrative embodiments, the number of conductive elements provided in the first communication section 13 should preferably be the same as the number of contacts in the second communication section provided in the lens. Furthermore, in addition to the number of conductive elements being the same as the number of contacts, when assembling the neutral density filter 1 with the lens, each conductive element should abut against only one contact to form an electrical connection.

[0060] Based on the above-described embodiment where the first communication unit 13 includes multiple conductive elements, the multiple annular conductive elements are arranged to surround the center point of the neutral density filter body 11 (i.e., the center line of the frame 121). Taking an annular conductive element as an example (refer to Figure 1), the multiple conductive elements can be arranged as concentric rings with different diameters, that is, in two adjacent conductive elements, the outer diameter of the inner conductive element is smaller than the inner diameter of the outer conductive element.

[0061] Referring to Figures 1 and 5, in some illustrative embodiments, the frame 121 of the neutral density filter 1 may be provided with multiple annular receiving grooves, and each conductive element may be configured to be embedded in one receiving groove. This not only restricts the position of the conductive element relative to the frame 121 but also creates physical isolation between adjacent conductive elements, thereby insulating them from each other. Furthermore, each annular conductive element may be configured to have the same width (i.e., the difference between the outer diameter and inner diameter of each conductive element is the same) to ensure that the conductive elements are evenly arranged on the end face of the frame 121. The width of each conductive element should be set as narrow as possible while still satisfying the electrical connection with the lens (i.e., the second communication unit) to save limited space within the end face of the frame 121. It should be understood that the embodiments of this disclosure are not limited to this.

[0062] For example, the number of conductive elements provided in the first communication unit 13 can be 4, 5, 6, 7, or any other arbitrary number.

[0063] For example, at least some of the conductive elements may be configured to have a different width from the other conductive elements, specifically to ensure that the conductive elements form an effective electrical connection with the lens.

[0064] In some illustrative embodiments, the frame 121 is magnetically attached to the lens.

[0065] Referring to Figures 1 and 5, in some illustrative embodiments, the mounting portion further includes a first suction member 122. The first suction member 122 is configured to attach to the lens.

[0066] Referring to Figures 1 and 5, in some illustrative embodiments, the first adsorption element 122 includes, but is not limited to, employing a magnet.

[0067] In other illustrative embodiments, the first adsorption element 122 is made of a material that can be attracted by a magnet, including but not limited to.

[0068] In some illustrative embodiments, such as when the first adsorption element 122 is a magnet, the lens should be provided with a second adsorption element that can be attracted by the magnet (as will be described in the following embodiments).

[0069] For example, if the second adsorption element is also a magnet, it should be configured to have the opposite magnetic poles to the first adsorption element 122, so that the first adsorption element 122 is adsorbed onto the second adsorption element.

[0070] For example, the second adsorbent may also be made of any one of ferromagnetic materials (including but not limited to at least one of iron alloys, cobalt alloys and nickel alloys), rare earth materials (such as neodymium, dysprosium, etc.) and some oxides (such as iron tetroxide, nickel sulfide, etc.) so that the first adsorbent 122 can adsorb the second adsorbent.

[0071] Similarly, if the second adsorption element is a magnet, the first adsorption element 122 can also be made of the material that can be adsorbed by a magnet.

[0072] Referring to Figures 1 and 5, in some illustrative embodiments, the first adsorption element 122 is configured as a ring structure.

[0073] Referring to Figures 1 and 5, in some illustrative embodiments, the mounting portion 12 includes a plurality of first suction members 122. The plurality of first suction members 122 are configured to be spaced apart around the center point of the neutral density filter body 11.

[0074] Referring to Figures 1 and 5, in some illustrative embodiments, the mounting portion 12 includes a plurality of annular first adsorption members 122. Specifically, the plurality of annular first adsorption members 122 are arranged in a manner similar to that of conductive members, i.e., the plurality of first adsorption members 122 are concentric rings with different diameters, and the outer diameter of the inner first adsorption member 122 of two adjacent first adsorption members 122 is smaller than the inner diameter of the outer first adsorption member 122.

[0075] Referring to Figures 1 and 5, in some illustrative embodiments, at least one first adsorption element 122 is located between two adjacent conductive elements.

[0076] Referring to Figures 1 and 5, in some illustrative embodiments, the conductive element and the first adsorption element 122 are arranged at intervals.

[0077] Referring to Figures 1 and 5, both the first adsorption element 122 and the conductive element are configured as annular structures. Specifically, multiple annular first adsorption elements 122 and conductive elements are alternately arranged around the center point of the neutral density filter body 11 (i.e., the center line of the frame 121).

[0078] In this embodiment, when the neutral density filter 1 is assembled onto the lens, a plurality of first suction members 122, arranged at intervals outward from the center point of the neutral density filter body 11, can form multiple connection positions with the lens (i.e., the second suction members disposed on the lens). These multiple connection positions are distributed approximately evenly outward from the inner side of the lens frame 121 to disperse the suction force between the neutral density filter 1 and the lens, thus ensuring that the neutral density filter 1 is securely connected to the lens. It should be understood that the embodiments of this disclosure are not limited thereto.

[0079] For example, the first adsorption member 122 is only disposed inside the conductive member located at the innermost side of the frame 121.

[0080] For example, the first adsorption element 122 is only disposed on the outside of the conductive element located on the outermost side of the frame 121.

[0081] For example, the first adsorption element 122 is located only between two adjacent conductive elements. Specifically, it is advisable that the adsorption element 122 and the lens form an adsorption force that can firmly connect the neutral density filter 1 to the lens.

[0082] Referring to FIG6, in some illustrative embodiments, the lens frame 121 is engaged with the lens.

[0083] Referring to FIG6, in some illustrative embodiments, the mounting portion 12 includes a locking member 123. The locking member 123 is disposed on the lens frame 121 and configured to engage with the front port of the lens.

[0084] Referring to FIG6, in some illustrative embodiments, the mounting portion 12 includes, but is not limited to, having two engaging members 123. Specifically, the two engaging members 123 are symmetrically arranged on the frame 121, and the two engaging members 123 are configured to move between a first position close to each other and a second position far apart from each other.

[0085] Referring to Figure 6, in some illustrative embodiments, the outer edge of the engaging member 123 is elastically provided with a protrusion. Correspondingly, the front port of the lens should be provided with a recess suitable for engaging with the protrusion, specifically an annular limiting groove.

[0086] In this embodiment, when the neutral density filter 1 is assembled onto the lens, the user can press the two engaging members 123 inward with their fingers; the two engaging members 123 undergo elastic deformation under the pressure applied by the user, placing them in a first position. At this time, the distance between the outer edges of the two engaging members 123 is less than the inner diameter of the limiting groove at the front port of the lens, allowing the engaging members 123 to be placed inside the front port of the lens; subsequently, the user can release the two engaging members 123 to stop applying pressure, and under the elastic action of the material (or elastic element, such as a compression spring), the two engaging members 123 return to a second position where the protrusion protrudes from the edge of the lens frame 121, engaging within the limiting groove provided on the lens, thereby connecting the neutral density filter 1 to the lens. It should be understood that the embodiments of this disclosure are not limited thereto.

[0087] For example, the neutral density filter 1 can also be mounted on the lens via threaded connection, hook connection, pull ring connection, or any other connection method. It should be noted that the neutral density filter 1 can meet the design requirements of electrically connecting the first communication unit 13 (i.e., the conductive element) to the lens under any of the above mechanical connection methods.

[0088] Example 2

[0089] Referring to FIG7, this disclosure also provides an imaging device. The imaging device 2 includes a body 21 and a lens 22. The lens 23 has a second communication unit 221, which is configured to be electrically connected to the body 21. When the neutral density filter body 11 of the neutral density filter 1 is mounted on the lens 22, the second communication unit 221 is electrically connected to the first communication unit 13 (i.e., conductive element) of the neutral density filter body 11 to output a control signal to the first communication unit 13.

[0090] Referring to FIG7, in some illustrative embodiments, an imaging unit (located within the body 21, not shown in the figure) is disposed within the body 21. Specifically, the imaging unit includes a circuit board and an imaging sensor, with the imaging sensor disposed on the circuit board. Further, the imaging sensor is configured to capture images, and the circuit board is configured to provide control signals to the imaging sensor. The imaging sensor includes, but is not limited to, complementary metal-oxide-semiconductor (CMOS), charge-coupled device (CCD), and other sensors configured to acquire visible light or a spectral band outside the visible light spectrum and form an image. Further, a lens 22 is disposed within the body 21, and the lens 22 includes a viewfinder that faces the imaging end of the imaging unit, so that light shines through the viewfinder onto the imaging end of the imaging unit. The lens 22 can be configured to be integrally disposed within the body 21 or detachably connected to the body 21.

[0091] In some illustrative embodiments, the second communication unit 221 is configured to transmit control signals generated by the fuselage 21 to the first communication unit 13.

[0092] In some illustrative embodiments, the lens 22 is provided with a second communication unit 221. Furthermore, with the neutral density filter 1 mounted on the front port of the lens 22, the first communication unit 13 and the second communication unit 221 are electrically connected. This allows the neutral density filter 1 to receive control signals output from the second communication unit 221 via the first communication unit 13. The control signals output via the second communication unit 221 can be generated by the body 21 (e.g., by a first control unit configured on the body 21, as will be explained in the following embodiments).

[0093] Referring to FIG7, the second communication unit 221 is disposed at the end of the lens 22 away from the body 21.

[0094] Referring to FIG7, the second communication unit 221 includes contacts.

[0095] Referring to FIG7, in some illustrative embodiments, the contact of the second communication unit 221 is disposed at the front port of the lens 22, and the radial position of the contact relative to the optical axis of the lens 22 should be configured such that it is approximately the same as the radial position of the conductive element disposed on the neutral density filter 1 relative to the center point of the neutral density filter body 11. That is, when the neutral density filter 1 is assembled on the lens 22, the conductive element can just abut against the contact, so that the neutral density filter 1 and the lens 22 form an effective electrical connection.

[0096] In some illustrative embodiments (not shown in the figures), the second communication unit 221 may include at least two contacts. These two contacts are a first power contact and a second power contact, respectively.

[0097] In some illustrative embodiments, the lens 22 integrates a driving unit suitable for driving the neutral density filter body 11, which may specifically employ multiple transistors (such as MOSFETs) or electronic switches configured as H-bridge drives. Taking MOSFETs (metal-oxide-semiconductor field-effect transistors) as an example, the first power contact and the second power contact may be configured to be electrically connected to the gate of the MOSFET, so that when a control signal is received, an adjustable current is output through the drain to further adjust the voltage of the electrodes of the neutral density filter body 11.

[0098] Referring to FIG7, in some other illustrative embodiments, the second communication unit 221 may include at least three contacts. These three contacts are a third power contact, a ground contact, and a control contact.

[0099] In some illustrative embodiments, the housing 21 integrates a first control unit for controlling the neutral density filter body 11, which may specifically be an MCU (microcontroller). A third power contact is connected to the MCU's power supply pin (e.g., VCC or VDD); a ground contact is connected to the MCU's ground pin (e.g., GND or VSS); and a control contact is connected to a digital input / output pin (i.e., I / O pin). It should be understood that if CMD is an analog signal, it can be connected to an analog input pin.

[0100] In some illustrative embodiments, the aforementioned first power contact, second power contact, third power contact, ground contact, and control contact include, but are not limited to, using spring pins (i.e., Pogo pins). Specifically, the tip of the spring pin is located at the front port of the lens 22 and protrudes from the front port. Thus, when the neutral density filter 1 is mounted at the front port of the lens 22, the conductive components of the neutral density filter 1 can tightly abut against the tip of the spring pin under the action of the spring, thereby forming an effective electrical connection.

[0101] Referring to FIG7, in some illustrative embodiments, a plurality of contacts (such as the two or three mentioned above) are arranged at radial intervals along the lens 22.

[0102] For example, multiple contacts can be configured with different spacings from the optical axis of lens 22, but all located in the same circumferential position, which helps to improve the integration of the circuit layout. It should be understood that the embodiments of this disclosure are not limited thereto.

[0103] For example, in addition to having different spacings with the optical axis of the lens 22, the multiple contacts can also be configured to be offset circumferentially along the lens 22.

[0104] Referring to Figure 7, in some illustrative embodiments, a second adsorption member 222 is also provided at the front port of the lens 22. Specifically, multiple second adsorption members 222 can be configured (two as shown in Figure 7), with the multiple second adsorption members 222 spaced circumferentially around the optical axis of the lens 22. The second adsorption member 222 can be a magnet; alternatively, at least one of the second adsorption member 222 and the first adsorption member 122 in the above embodiment 1 can be a magnet, while the other can be made of a material that can be attracted by a magnet, similar to embodiment 1, and therefore will not be described again. Furthermore, the second adsorption member 222 is offset from the second communication unit 221 along the circumferential direction of the optical axis of the lens 22.

[0105] In this embodiment, the neutral density filter 1 can be adsorbed onto the second adsorption member 222 provided on the lens 22 via the first adsorption member 122, thereby assembling the neutral density filter 1 onto the lens 22. Simultaneously, the first communication section 13 provided on the neutral density filter 1 tightly abuts against the second communication section 221 provided on the lens 22 under the action of adsorption force, forming an electrical connection, so that the control signal output by the body 21 is output through the lens 22 and received by the neutral density filter 1. It should be understood that the embodiments of this disclosure are not limited thereto.

[0106] For example, an annular limiting groove can be provided at the front port of the lens 22, and the neutral density filter 1 can be snapped into the limiting groove by a snap-fit ​​component to realize the assembly of the neutral density filter 1 and the lens 22.

[0107] For example, the neutral density filter 1 can also be assembled to the lens 22 via threaded connection, hook connection, pull ring connection, or any other connection method. It should be noted that the neutral density filter 1 can meet the design requirement of electrically connecting the first communication unit 13 (i.e., the conductive element) and the second communication unit 221 under any of the above mechanical connection methods.

[0108] Referring to FIG7, in some illustrative embodiments, the lens 22 is detachably attached to the body 21.

[0109] For example, the lens 22 can be mounted on the body 21 by means of threaded connection, snap-fit ​​connection, hook connection, pull ring connection and any other connection method.

[0110] Example 3

[0111] Referring to FIG8, this disclosure also provides an imaging system, including a camera body 21, a lens 22, a neutral density (ND) filter body 11, a mounting portion 12, and a first communication portion 13. The lens 22 is disposed on the camera body 21 and has a lens 22. The lens 22 is configured to be electrically connected to the camera body 21. The mounting portion 12 is disposed on the ND filter body 11 and is configured to be mechanically connected to the external lens 22, so as to detachably mount the ND filter body 11 to the lens 22. The first communication portion 13 is configured to electrically connect the ND filter body 11 to the imaging device mounting the lens 22 via the lens 22. When the ND filter body 11 is mounted to the lens 22 via the mounting portion 12, the ND filter body 11 receives a control signal output from the second communication portion 221 of the lens 22 via the first communication portion 13. The control signal is used to adjust the optical parameters of the ND filter body 11.

[0112] In this embodiment, the neutral density filter body 11 is detachably connected to the lens 22 via the mounting part 12. When mounted on the lens 22, the first communication part 13 electrically connects the neutral density filter body 11 to the shooting device 2 via the second communication part 221 provided on the lens 22. That is, when the neutral density filter body 11 is connected to the lens 22 via the mounting part, the first communication part 13 can be simultaneously electrically connected to the shooting device 2 via the lens 22, thereby allowing the shooting device 2 to directly draw power (in addition to receiving power from the shooting device 2, it also receives communication signals, such as analog signals and / or digital signals). This eliminates the need for a dedicated power adapter for the neutral density filter 1 in the shooting system, simplifying the system and increasing its integration. Furthermore, it allows for easier mounting of the neutral density filter 1 onto the shooting device 2, facilitating quick access and removal, thus enabling the user to better control the shooting opportunity.

[0113] According to an embodiment of this disclosure, the shooting system further includes an interaction unit (not shown in the figure). The interaction unit is configured to output control signals to the first communication unit 13 based on user operations performed on the interaction unit.

[0114] According to embodiments of this disclosure, an interaction unit is disposed on the body 21. The interaction unit includes physical touch keys and / or virtual touch keys.

[0115] In some illustrative embodiments, physical touch keys include, but are not limited to, at least one of physical buttons, dials, and joysticks. Specifically, the aforementioned physical touch keys are buttons that require a certain amount of pressure to trigger and provide clear tactile feedback.

[0116] The aforementioned physical touch buttons include, but are not limited to, the shutter button (for taking photos), the mode dial (for switching working modes, such as automatic mode, aperture priority mode, shutter priority mode, and manual mode), the ISO button (for adjusting the sensitivity, i.e., the ISO value), the aperture adjustment button / dial (for adjusting the aperture size), the focus selection button (for selecting the focus mode and focus point), and the drive mode button (for selecting shooting modes such as single shot, continuous shot, and timer shooting).

[0117] In other illustrative embodiments, virtual touch keys include, but are not limited to, those integrated into the display screen of the housing 21. Specifically, these virtual control keys are buttons that generate electrical signals in response to changes in capacitance or resistance at a trigger position.

[0118] The aforementioned virtual touch keys include, but are not limited to, menu buttons (used to access the menu system of the camera body 21 for various settings), INFO buttons (used to show or hide information displayed on the screen), play buttons (used to view photos taken), custom buttons (allowing users to assign specific functions to custom buttons), and delete buttons (used to delete selected photos), etc.

[0119] Based on the aforementioned interactive unit, user operations via the interactive unit include, but are not limited to, accessing the menu system configured on the camera body 21 via the menu button, locating settings related to the neutral density filter within the menu system, and then adjusting the transmittance of the neutral density filter by selecting the relevant option (such as ND2, ND4, ND8, or providing continuously adjustable ND values, etc.). Alternatively, users can use some custom buttons (such as C-Fn buttons) on the camera body 21 to adjust the transmittance of the neutral density filter 1 accordingly.

[0120] Referring to FIG9, in some illustrative embodiments, the neutral density filter 1 includes a neutral density filter body 11, a first driving unit 14, and a first communication unit 13. Specifically, the first communication unit 13 includes a first conductive element 131, a second conductive element 132, and a third conductive element 133. Further, the first driving unit 14 is electrically connected to the electrodes disposed on the neutral density filter body 11, and to the aforementioned three conductive elements (i.e., the first conductive element 131, the second conductive element 132, and the third conductive element 133). The first driving unit 14 includes, but is not limited to, multiple transistors (such as MOSFETs) or electronic switches configured as H-bridge drives. It is similar to the driving unit integrated into the lens 22 in the aforementioned embodiments, and therefore will not be described again. Further, in some illustrative embodiments, the lens 22 includes a second communication unit 221, a second control unit 223, and a lens driving unit 224. Specifically, the second control unit 223, the second communication unit 221, and the lens driving unit 224 are electrically connected. The second communication unit 221 includes a ground contact 2211, a control contact 2212, and a third power contact 2213. The ground contact 2211 is electrically connected to the first conductive element 131, the control contact 2212 is electrically connected to the second conductive element 132, and the third power contact 2213 is electrically connected to the third conductive element 133. The second control unit 223 may include, but is not limited to, an MCU (microcontroller), and the lens drive unit 224 may include, but is not limited to, a stepper motor.

[0121] Furthermore, in some illustrative embodiments, the body 21 includes a first control unit 211 and a third communication unit 212. Specifically, the third communication unit 212 is electrically connected to the second control unit 223 in the lens 22, and to the first control unit 211, respectively. The first control unit 211 may include, but is not limited to, an MCU (microcontroller), and the third communication unit 212 uses contacts similar to those of the second communication unit 221 to electrically connect to the second control unit 223 of the lens 22.

[0122] Referring to the embodiment shown in FIG9, the first control unit 211 (such as the MCU of the camera body) is electrically connected to the second control unit 223 (such as the MCU of the lens) through the third communication unit 212. The third communication unit 212 may adopt a dedicated interface (such as an EF interface and an F interface with multiple contacts). The first control unit 211 is used to generate control signals, and the second control unit 223 is only used as an intermediary control unit (such as an intermediary MCU) to transmit control signals to the first drive unit 14 through the second communication unit 221 and the first communication unit 13. The first drive unit 14 adjusts the voltage of the two electrodes (i.e., the first electrode 112 and the second electrode 118) output to the neutral density filter body 11 according to the control signals, thereby adjusting the light transmittance of the neutral density filter body 11.

[0123] In another illustrative embodiment, the first control unit 211 can be directly connected to the second communication unit 211 via the third communication unit 212, and then electrically connected to the first communication unit 13 via the second communication unit 211, thus omitting the second control unit 223. This simplifies the circuit design.

[0124] Referring to FIG10, in some other illustrative embodiments, the neutral density filter 1 includes a neutral density filter body 11 and a first communication unit 13. Specifically, the first communication unit 13 includes a fourth conductive element 134 and a fifth conductive element 135. Furthermore, the fourth conductive element 134 and the fifth conductive element 135 are electrically connected to the neutral density filter body 11, respectively.

[0125] Furthermore, in some illustrative embodiments, the lens 22 includes a second communication unit 221, a second control unit 223, a lens drive unit 224, and a second drive unit 225. Specifically, the second control unit 223, the second drive unit 225, and the lens drive unit 224 are electrically connected, and the second communication unit 221 and the second drive unit 225 are electrically connected. The second communication unit 221 includes a first power contact 2214 and a second power contact 2215. Further, the first power contact 2214 is electrically connected to a fourth conductive element 134, and the second power contact 2215 is electrically connected to a fifth conductive element 135. The second drive unit 225 includes, but is not limited to, multiple transistors (such as MOSFETs) or electronic switches driven by an H-bridge. It is similar to the drive unit integrated into the lens 22 in the aforementioned embodiments, and therefore will not be described again.

[0126] Referring to the embodiment shown in FIG10, this method is similar to the embodiment shown in FIG9, the main difference being that the drive unit (i.e., the second drive unit 225) that generates a control signal based on the first control unit 211 and performs the adjustment operation is disposed inside the lens 22. This allows the neutral density filter 1 to have only two conductive elements (i.e., the fourth conductive element 134 and the fifth conductive element 135), that is, one fewer conductive element than in the embodiment shown in FIG9. This saves the limited space of the neutral density filter 1, making it more compact and facilitating miniaturization.

[0127] Referring to Figures 11 and 12, in some illustrative embodiments, the imaging system further includes a signal generation circuit 2111 and a control circuit 2112. The signal generation circuit 2111 is configured to generate a control signal according to predetermined parameters. The control signal includes a first periodic signal and a second periodic signal, wherein the first periodic signal and the second periodic signal have a predetermined phase difference relative to each other. The control circuit 2112 is configured to, in response to a user operation, adjust the duty cycle of the first periodic signal to obtain a first adjustment signal, adjust the second periodic signal to obtain a second adjustment signal, and, based on the first and second adjustment signals, control the voltage of the two electrodes of the neutral density filter body, thereby adjusting the transmittance of the neutral density filter body.

[0128] Referring to Figures 11 and 12, in some illustrative embodiments, the signal generation circuit 2111 and the control circuit 2112 are, but are not limited to, integrated into the first control unit 211 (such as an MCU disposed in the housing 21). The signal generation unit 2111 is configured to generate a first periodic signal and a second periodic signal. Specifically, the first periodic signal and the second periodic signal are, but are not limited to, pulse-modulated signals (i.e., PWM) with a phase difference of 180°. Further, the control circuit 2112 is configured to modulate the pulse-modulated signal at a fixed frequency to adjust the voltage applied to the two electrodes (i.e., the first electrode 112 and the second electrode 118) of the neutral density filter 1, thereby adjusting the transmittance of the neutral density filter body 11.

[0129] In this implementation, the circuit design described above allows the first control unit 211 (such as the MCU installed in the housing 21) to output a single pulse modulation signal through only one I / O interface, thereby controlling the transmittance of the neutral density filter 1 (i.e., the neutral density filter body 11). This helps to save resources of the first control unit 211 (such as the MCU installed in the housing 21).

[0130] Referring to FIG11, in some illustrative embodiments, the signal generation circuit 2111 includes an AND gate unit 21113, a signal generation unit 21111, and a frequency divider unit 21112. The signal generation unit 21111 is configured to generate an initial periodic signal according to predetermined parameters. The frequency divider unit 21112 is configured to divide the initial periodic signal to obtain a first frequency-divided signal and a second frequency-divided signal, wherein the first frequency-divided signal and the second frequency-divided signal have a predetermined phase difference relative to each other. The AND gate unit 21113 is configured to generate a first periodic signal based on the initial periodic signal and the first frequency-divided signal, and to generate a second periodic signal based on the initial periodic signal and the second frequency-divided signal.

[0131] Referring to FIG11, the control circuit 2112 includes a control unit 21121, a first load switch 21122, and a second load switch 21123. The input terminal of the first load switch 21122 receives a first periodic signal, and its output terminal is connected to the first electrode of the neutral density filter body via a first communication unit. The input terminal of the second load switch 21123 receives a second periodic signal, and its output terminal is connected to the second electrode of the neutral density filter body via the first communication unit. The control unit 21121 is configured to generate a control voltage based on user operation and apply the control voltage to the control terminals of the first load switch 21122 and the second load switch 21123 respectively, in order to control the states of the first load switch 21122 and the second load switch 21123, thereby adjusting the duty cycle of the first periodic signal and the second periodic signal.

[0132] Referring to FIG11, in some illustrative embodiments, the signal generation unit 21111 outputs a single PWM signal as a control signal from an I / O interface of the MCU. The PWM signal is processed by the frequency division unit 21112 (which can be a D flip-flop or a counter) to form a count value signal. The count value signal is divided into two paths, a first cycle signal and a second cycle signal, with a phase difference of 180° (i.e., a predetermined phase difference), by the AND gate unit 21113. Both the first cycle signal and the second cycle signal are PWM signals. The first cycle signal and the second cycle signal control the first load switch 21122 and the second load switch 21123 respectively to realize the alternating on and off of the first load switch 21122 and the second load switch 21123 (i.e., one is on and the other is off), so as to adjust the duty cycle of the first cycle signal and the second cycle signal, thereby adjusting the voltage applied to the two electrodes (i.e., the first electrode 112 and the second electrode 118) of the neutral density filter body 11, so as to continuously adjust the transmittance of the neutral density filter 1.

[0133] Referring to FIG12, the control circuit 2112 includes a control unit 21121, a first operational amplifier unit 21124, and a second operational amplifier unit 21125. The first signal input terminal of the first operational amplifier unit 21124 receives a first periodic signal, the second signal input terminal of the first operational amplifier unit 21124 receives a reference signal, and the output terminal of the first operational amplifier unit 21124 is connected to the first electrode of the neutral density filter body via a first communication unit. The first signal input terminal of the second operational amplifier unit 21125 receives a second periodic signal, the second signal input terminal of the second operational amplifier unit 21125 receives the reference signal, and the output terminal of the second operational amplifier unit 21125 is connected to the second electrode of the neutral density filter body via the first communication unit. The control unit 21121 is configured to generate a control voltage based on user operation and apply the control voltage to the power input terminals of the first operational amplifier unit 21124 and the second operational amplifier unit 21125 to control the amplitudes of the first and second periodic signals.

[0134] Referring to Figure 12, in some illustrative embodiments, the signal generation unit 21111 outputs a single-channel PWM signal as a control signal from an I / O interface of the MCU. This control signal, under the combined action of the base frequency (as the main control signal) and the carrier frequency (auxiliary signal), generates a first-cycle signal and a second-cycle signal as modulation signals. The first-cycle signal is amplified by the first operational amplifier unit 21124, and the second-cycle signal is amplified by the second operational amplifier unit 21125, respectively adjusting the amplitude of the output voltage. The two amplified output voltages are applied to the two electrodes (i.e., the first electrode 112 and the second electrode 118) of the neutral density filter body 11. Thus, the voltage applied to the two electrodes (i.e., the first electrode 112 and the second electrode 118) of the neutral density filter body 11 can be adjusted according to the control signal generated by the signal generation unit 21111 and the modulation effect of the operational amplifier units (i.e., the first operational amplifier unit 21124 and the second operational amplifier unit 21125), thereby continuously adjusting the transmittance of the neutral density filter 1.

[0135] In addition, other features of this embodiment three have been described in the above embodiments one and two, and will not be repeated here.

[0136] Example 4

[0137] Referring to FIG13, this disclosure also provides a control method for an imaging system, the imaging system including a neutral density filter body with two electrodes, a signal generation circuit, a control circuit, and an interaction unit. The control method includes:

[0138] Step S110: The signal generation circuit is configured to generate a first periodic signal and a second periodic signal according to predetermined parameters, wherein the first periodic signal and the second periodic signal have a predetermined phase difference relative to each other;

[0139] Step S120: The control circuit is configured to respond to user operation in the interaction section, adjust the duty cycle of the first period signal to obtain a first adjustment signal, adjust the second period signal to obtain a second adjustment signal, and control the voltage of the two electrodes of the neutral density filter body based on the first adjustment signal and the second adjustment signal, thereby adjusting the transmittance of the neutral density filter body.

[0140] In this implementation, the control method for the shooting system can be applied to the shooting system of Embodiment 3. Based on the control method described above, the first control unit 211 (such as the MCU installed in the camera body 21) can control the transmittance of the neutral density filter 1 (i.e., the neutral density filter body 11) by outputting a single pulse modulation signal through only one I / O interface. This not only helps to save the resources of the first control unit 211 (such as the MCU installed in the camera body 21), but also allows for continuous and stepless adjustment of the transmittance of the neutral density filter 1. The shooting system provided in Embodiment 3 includes, but is not limited to, at least one of a DSLR camera, mirrorless camera, compact camera, superzoom camera, and professional camera. Furthermore, the control method for the shooting system described above can also be applied to control gimbal cameras, action cameras, wearable cameras, underwater cameras, and any other portable camera.

[0141] In some illustrative embodiments, the signal generation circuit of the imaging system includes an AND gate unit, a signal generation unit, and a frequency divider unit. Based on the above signal generation circuit, step S110 includes:

[0142] Step S111: The signal generation unit is configured to generate an initial periodic signal according to predetermined parameters;

[0143] Step S112: The frequency division unit is configured to divide the initial periodic signal to obtain a first frequency division signal and a second frequency division signal, wherein the first frequency division signal and the second frequency division signal have a predetermined phase difference relative to each other; the AND gate unit is configured to generate the first periodic signal based on the initial periodic signal and the first frequency division signal, and to generate the second periodic signal based on the initial periodic signal and the second frequency division signal.

[0144] In some illustrative embodiments, the control circuit of the imaging system includes a control unit, a first load switch, and a second load switch. Based on the above signal control circuit, step S120 includes:

[0145] Step S121: The input terminal of the first load switch receives the first cycle signal, and the output terminal of the first load switch is connected to the first electrode of the neutral density filter body via the communication unit;

[0146] Step S122: The input terminal of the second load switch receives the second cycle signal, and the output terminal of the second load switch is connected to the second electrode of the neutral density filter body via the communication unit;

[0147] Step S123: The control unit is configured to generate a control voltage based on user operation and apply the control voltage to the control terminals of the first load switch and the second load switch respectively, so as to control the state of the first load switch and the second load switch, thereby adjusting the duty cycle of the first cycle signal and the second cycle signal.

[0148] In some other illustrative embodiments, the control circuit of the imaging system includes a control unit, a first operational amplifier unit, and a second operational amplifier unit. Step S120 further includes:

[0149] S124: The first signal input terminal of the first operational amplifier unit receives the first periodic signal, the second signal input terminal of the first operational amplifier unit receives the reference signal, and the output terminal of the first operational amplifier unit is connected to the first electrode of the neutral density mirror body via the communication unit.

[0150] S125: The first signal input terminal of the second operational amplifier unit receives the second periodic signal, the second signal input terminal of the second operational amplifier unit receives the reference signal, and the output terminal of the second operational amplifier unit is connected to the second electrode of the neutral density mirror body via the communication unit.

[0151] S126: The control unit is configured to generate a control voltage based on user operation and apply the control voltage to the power input terminals of the first operational amplifier unit and the second operational amplifier unit in order to control the amplitude of the first periodic signal and the second periodic signal.

[0152] It should also be noted that the directional terms mentioned in the embodiments, such as "up," "down," "front," "back," "left," and "right," are only for reference in the accompanying drawings and are not intended to limit the scope of protection of this disclosure. Throughout the drawings, the same elements are represented by the same or similar reference numerals. Conventional structures or constructions will be omitted where they may cause confusion in understanding this disclosure.

[0153] The embodiments of this disclosure have been described above. However, these embodiments are for illustrative purposes only and are not intended to limit the scope of this disclosure. Although various embodiments have been described above, this does not mean that the measures in the various embodiments cannot be used advantageously in combination. The scope of this disclosure is defined by the appended claims and their equivalents. Various substitutions and modifications can be made by those skilled in the art without departing from the scope of this disclosure, and all such substitutions and modifications should fall within the scope of this disclosure.

Claims

1. A neutral density filter, wherein, include: The body of the neutral density filter; A mounting part is provided on the neutral density filter body and is configured to be mechanically connected to an external lens so as to detachably mount the neutral density filter body to the lens; as well as The first communication unit is configured to electrically connect the neutral density filter body to the imaging device equipped with the lens via the lens; When the neutral density filter body is mounted on the lens via the mounting part, the neutral density filter body receives a control signal via the first communication part, and the control signal is used to adjust the optical parameters of the neutral density filter body.

2. The neutral density filter according to claim 1, wherein, The optical parameters include light transmittance.

3. The neutral density filter according to claim 2, wherein, The neutral density filter body includes: Two electrodes, the two electrodes being stacked and spaced apart; and A liquid crystal layer, disposed between the two electrodes, has dye molecules configured to adjust their orientation in response to different electric field intensities generated by the electrodes, thereby changing the transmittance of the neutral density filter body.

4. The neutral density filter according to claim 3, wherein, The neutral density filter body also includes two substrates, which are arranged in parallel and spaced apart, and the liquid crystal layer is formed between the two substrates; The substrate is made of a light-transmitting material.

5. The neutral density filter according to claim 3 or 4, wherein, The first communication unit is disposed on the mounting unit and is electrically connected to the two electrodes.

6. The neutral density filter according to claim 5, wherein, The first communication unit includes a conductive element disposed on the end face of the mounting unit facing the lens.

7. The neutral density filter according to claim 6, wherein, The conductive element is configured in a ring structure.

8. The neutral density filter according to claim 7, wherein, The conductive element is configured as a ring structure; Alternatively, the conductive element may be configured as a square ring structure.

9. The neutral density filter according to claim 8, wherein, The first communication unit includes a plurality of conductive elements, which are spaced apart around the center point of the neutral density filter body.

10. The neutral density filter according to claim 9, wherein, The first communication unit includes at least two of the conductive elements; Alternatively, the first communication unit may include at least three of the conductive elements.

11. The neutral density filter according to any one of claims 6 to 10, wherein, The mounting part includes a lens frame, and the neutral density filter body is disposed in the middle of the lens frame.

12. The neutral density filter according to claim 11, wherein, The frame is magnetically attached to the lens.

13. The neutral density filter according to claim 12, wherein, The mounting portion further includes a first adsorption element configured to adsorb onto the lens.

14. The neutral density filter according to claim 13, wherein, The first adsorption element includes a magnet; Alternatively, the first adsorption element may be made of a material that can be attracted by the magnet.

15. The neutral density filter according to claim 13 or 14, wherein, The first adsorption element is configured as a ring structure.

16. The neutral density filter according to claim 15, wherein, The mounting portion includes a plurality of the first adsorption elements, which are configured to be spaced apart around the center point of the neutral density filter body.

17. The neutral density filter according to claim 16, wherein, At least one of the first adsorption elements is located between two adjacent conductive elements.

18. The neutral density filter according to claim 17, wherein, The conductive component and the first adsorption component are arranged at intervals.

19. The neutral density filter according to claim 11, wherein, The frame engages with the lens.

20. The neutral density filter according to claim 19, wherein, The mounting part includes a locking member disposed on the lens frame and configured to engage with the front port of the lens.

21. A shooting device, wherein, include: body; The lens, mounted on the camera body, has a second communication unit configured to be electrically connected to the camera body; When the neutral density filter body is mounted on the lens, the second communication unit is electrically connected to the first communication unit of the neutral density filter body to output a control signal to the first communication unit.

22. The shooting device according to claim 21, wherein, The second communication unit is configured to transmit the control signal generated by the fuselage to the first communication unit.

23. The shooting device according to claim 21 or 22, wherein, The second communication unit is located at the end of the lens that is away from the body.

24. The shooting device according to claim 23, wherein, The second communication unit includes contacts.

25. The shooting device according to claim 24, wherein, The second communication unit includes at least two of the aforementioned contacts; Among them, at least two of the contacts are a first power contact and a second power contact.

26. The shooting device according to claim 24, wherein, The second communication unit includes at least three of the aforementioned contacts; Among them, at least three of the contacts are a third power contact, a grounding contact, and a control contact.

27. The imaging device according to claim 25 or 26, wherein, The plurality of contacts are arranged at radial intervals along the lens.

28. The shooting device according to claim 21, wherein, The lens is detachably attached to the camera body.

29. A shooting system, wherein, include: body; The lens, mounted on the camera body, has a second communication unit configured to be electrically connected to the camera body; The body of the neutral density filter; A mounting part is provided on the neutral density filter body and is configured to be mechanically connected to an external lens so as to detachably mount the neutral density filter body to the lens; as well as The first communication unit is configured to electrically connect the neutral density filter body to the imaging device equipped with the lens via the lens; When the neutral density filter body is mounted on the lens via the mounting part, the neutral density filter body receives a control signal output by the second communication part via the first communication part. The control signal is used to adjust the optical parameters of the neutral density filter body.

30. The shooting system according to claim 29, wherein, The optical parameters include light transmittance.

31. The shooting system according to claim 30, wherein, The neutral density filter body includes: Two electrodes, the two electrodes being stacked and spaced apart; and A liquid crystal layer, disposed between the two electrodes, has dye molecules configured to adjust their orientation in response to different electric field intensities generated by the electrodes, thereby changing the transmittance of the neutral density filter body.

32. The shooting system according to claim 31, wherein, The neutral density filter body also includes two substrates, which are arranged in parallel and spaced apart, and the liquid crystal layer is formed between the two substrates; The substrate is made of a light-transmitting material.

33. The shooting system according to claim 31 or 32, wherein, The first communication unit is disposed on the mounting unit and is electrically connected to the two electrodes.

34. The shooting system according to claim 33, wherein, The second communication unit is configured to output the control signal generated by the fuselage to the first communication unit.

35. The shooting system according to claim 34, wherein, The second communication unit is located at the end of the lens that is away from the body.

36. The shooting system according to claim 35, wherein, The second communication unit includes contacts; The first communication unit includes a conductive element, which is disposed on the end face of the mounting unit facing the lens; When the mounting part is connected to the lens, the conductive element abuts against the contact point and is electrically connected to the contact point.

37. The shooting system according to claim 36, wherein, The second communication unit includes at least two of the aforementioned contacts; Among them, at least two of the contacts are a first power contact and a second power contact.

38. The shooting system according to claim 36, wherein, The second communication unit includes at least three of the aforementioned contacts; Among them, at least three of the contacts are a third power contact, a grounding contact, and a control contact.

39. The imaging system according to claim 37 or 38, wherein, The plurality of contacts are arranged at radial intervals along the lens.

40. The shooting system according to claim 39, wherein, The conductive components are configured in a ring structure.

41. The shooting system according to claim 40, wherein, The conductive element is configured as a ring structure; Alternatively, the conductive element may be configured as a square ring structure.

42. The shooting system according to claim 41, wherein, The first communication unit includes a plurality of conductive elements, the same number as the number of contacts, and the plurality of conductive elements are spaced apart around the center point of the neutral density filter body.

43. The imaging system according to any one of claims 39 to 41, wherein, The mounting part includes a lens frame, and the neutral density filter body is disposed in the middle of the lens frame.

44. The shooting system according to claim 43, wherein, The frame is magnetically attached to the lens.

45. The shooting system according to claim 44, wherein, The mounting part also includes a first adsorption element; The lens further includes a second adsorption member disposed on the surface of the lens facing the first adsorption member, and the first adsorption member is configured to adsorb onto the second adsorption member.

46. ​​The shooting system according to claim 45, wherein, One of the first adsorption element and the second adsorption element is a magnet, and the other is made of a material that can be adsorbed by the magnet.

47. The shooting system according to claim 45, wherein, Both the first and second adsorption elements are magnets.

48. The imaging system according to any one of claims 45 to 47, wherein, The first adsorption element is configured as a ring structure; And / or, the second adsorption element is configured as a ring structure.

49. The shooting system according to claim 48, wherein, The plurality of the first adsorption elements are configured to be spaced apart around the center point of the neutral density mirror body; A plurality of the second adsorption elements are configured to be spaced apart around the optical axis of the lens; The center point of the neutral density filter body is located on the extension line of the optical axis of the lens.

50. The shooting system according to claim 49, wherein, At least one of the first adsorption elements is located between two adjacent conductive elements.

51. The shooting system according to claim 50, wherein, The conductive component and the first adsorption component are arranged at intervals.

52. The shooting system according to claim 43, wherein, The frame engages with the lens.

53. The shooting system according to claim 52, wherein, The mounting part includes a locking member disposed on the lens frame and configured to engage with the front port of the lens.

54. The shooting system according to claim 29, wherein, The lens is detachably attached to the camera body.

55. The shooting system according to claim 31, wherein, It also includes an interaction unit, configured to output control signals to the first communication unit based on user operations performed by the user in the interaction unit.

56. The shooting system according to claim 44, wherein, The interactive unit is located on the body; The interaction unit includes physical touch keys and / or virtual touch keys.

57. The imaging system according to claim 55 or 56, wherein, Also includes: A signal generation circuit is configured to generate the control signal according to predetermined parameters. The control signal includes a first periodic signal and a second periodic signal, wherein the first periodic signal and the second periodic signal have a predetermined phase difference relative to each other. The control circuit is configured to, in response to a user operation, adjust the duty cycle of the first periodic signal to obtain a first adjustment signal, adjust the second periodic signal to obtain a second adjustment signal, and, based on the first adjustment signal and the second adjustment signal, control the voltage of the two electrodes of the neutral density filter body, thereby adjusting the transmittance of the neutral density filter body.

58. The shooting system according to claim 57, wherein, The control circuit includes a control unit, a first load switch, and a second load switch; The input terminal of the first load switch receives the first periodic signal, and the output terminal of the first load switch is connected to the first electrode of the neutral density mirror body via the first communication unit. The input terminal of the second load switch receives the second periodic signal, and the output terminal of the second load switch is connected to the second electrode of the neutral density mirror body via the first communication unit; The control unit is configured to generate a control voltage based on the user operation, and apply the control voltage to the control terminals of the first load switch and the second load switch respectively, so as to control the state of the first load switch and the second load switch, thereby adjusting the duty cycle of the first periodic signal and the second periodic signal.

59. The shooting system according to claim 57, wherein, The control circuit includes a control unit, a first operational amplifier unit, and a second operational amplifier unit; Wherein, the first signal input terminal of the first operational amplifier unit receives the first periodic signal, the second signal input terminal of the first operational amplifier unit receives the reference signal, and the output terminal of the first operational amplifier unit is connected to the first electrode of the neutral density mirror body via the first communication unit. The first signal input terminal of the second operational amplifier unit receives the second periodic signal, the second signal input terminal of the second operational amplifier unit receives the reference signal, and the output terminal of the second operational amplifier unit is connected to the second electrode of the neutral density mirror body via the first communication unit. The control unit is configured to generate a control voltage based on the user operation and apply the control voltage to the power input terminals of the first operational amplifier unit and the second operational amplifier unit in order to control the amplitude of the first periodic signal and the second periodic signal.

60. The shooting system according to claim 57, wherein, The signal generation circuit includes an AND gate unit, a signal generation unit, and a frequency division unit; The signal generation unit is configured to generate an initial periodic signal according to the predetermined parameters; The frequency division unit is configured to divide the initial periodic signal to obtain a first frequency-divided signal and a second frequency-divided signal, wherein the first frequency-divided signal and the second frequency-divided signal have the predetermined phase difference relative to each other; the AND gate unit is configured to generate the first periodic signal based on the initial periodic signal and the first frequency-divided signal, and to generate the second periodic signal based on the initial periodic signal and the second frequency-divided signal.

61. A control method for a shooting system, wherein, The imaging system includes: a neutral density filter body with two electrodes, a signal generation circuit, a control circuit, and an interaction unit; the control method includes: The signal generation circuit is configured to generate a first periodic signal and a second periodic signal according to predetermined parameters, wherein the first periodic signal and the second periodic signal have a predetermined phase difference relative to each other; The control circuit is configured to, in response to a user operation on the interactive unit, adjust the duty cycle of the first periodic signal to obtain a first adjustment signal, adjust the second periodic signal to obtain a second adjustment signal, and, based on the first adjustment signal and the second adjustment signal, control the voltage of the two electrodes of the neutral density filter body, thereby adjusting the transmittance of the neutral density filter body.

62. The control method according to claim 61, wherein, The control circuit includes a control unit, a first load switch, and a second load switch; The input terminal of the first load switch receives the first periodic signal, and the output terminal of the first load switch is connected to the first electrode of the neutral density mirror body via the communication unit. The input terminal of the second load switch receives the second periodic signal, and the output terminal of the second load switch is connected to the second electrode of the neutral density filter body via the communication unit; The control unit is configured to generate a control voltage based on the user operation, and apply the control voltage to the control terminals of the first load switch and the second load switch respectively, so as to control the state of the first load switch and the second load switch, thereby adjusting the duty cycle of the first periodic signal and the second periodic signal.

63. The control method according to claim 61, wherein, The control circuit includes a control unit, a first operational amplifier unit, and a second operational amplifier unit; Wherein, the first signal input terminal of the first operational amplifier unit receives the first periodic signal, the second signal input terminal of the first operational amplifier unit receives the reference signal, and the output terminal of the first operational amplifier unit is connected to the first electrode of the neutral density mirror body via the communication unit. The first signal input terminal of the second operational amplifier unit receives the second periodic signal, the second signal input terminal of the second operational amplifier unit receives the reference signal, and the output terminal of the second operational amplifier unit is connected to the second electrode of the neutral density mirror body via the communication unit. The control unit is configured to generate a control voltage based on the user operation and apply the control voltage to the power input terminals of the first operational amplifier unit and the second operational amplifier unit in order to control the amplitude of the first periodic signal and the second periodic signal.

64. The control method according to claim 61, wherein, The signal generation circuit includes an AND gate unit, a signal generation unit, and a frequency division unit; The signal generation unit is configured to generate the initial periodic signal according to the predetermined parameters; The frequency division unit is configured to divide the initial periodic signal to obtain a first frequency-divided signal and a second frequency-divided signal, wherein the first frequency-divided signal and the second frequency-divided signal have the predetermined phase difference relative to each other; the AND gate unit is configured to generate the first periodic signal based on the initial periodic signal and the first frequency-divided signal, and to generate the second periodic signal based on the initial periodic signal and the second frequency-divided signal.

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