CN112189166A

CN112189166A - Filter device and shooting equipment

Info

Publication number: CN112189166A
Application number: CN201880093613.0A
Authority: CN
Inventors: 高志浩; 王平
Original assignee: Victor Doha Su Co ltd
Current assignee: Victor Doha Su Co ltd
Priority date: 2018-12-28
Filing date: 2018-12-28
Publication date: 2021-01-05
Also published as: WO2020133258A1

Abstract

A filter device and a photographing apparatus. The filter device is arranged at the front end of a lens (20), and comprises a mounting base (1) and at least one filter assembly (2), wherein the mounting base (1) is used for being connected to the front end of the lens (20), and the filter assembly (2) is mounted on the mounting base (1) in a magnetic adsorption mode. The invention has simple and convenient disassembly and assembly process.

Description

Filter device and shooting equipment

Technical Field

The invention relates to the technical field of camera shooting, in particular to a filter device and shooting equipment.

Background

The filter is a commonly used photographic accessory, and is generally installed at the front end of a lens of a shooting device such as a camera, and is used for selectively absorbing or filtering different wave bands of light, so as to improve the image quality of a shot work or form a special visual effect.

At present, the filter usually has more kind, and in order to install the filter at the front end of camera lens, the lens outside of filter is provided with solid fixed ring usually, is provided with the screw thread on the solid fixed ring, therefore can accomplish the fixed of filter at the camera lens front end through the screw thread closure.

However, the current filter needs to be mounted on the lens or dismounted from the lens by screwing, and the dismounting process is tedious and takes a long time.

Disclosure of Invention

The invention provides a filter device and shooting equipment, which are simple and convenient in disassembly and assembly processes.

In one aspect, the invention provides a filter device for being arranged at the front end of a lens, the filter device comprises a mounting base and at least one filter assembly, the mounting base is used for being connected to the front end of the lens, and the filter assembly is arranged on the mounting base in a magnetic adsorption mode.

In another aspect, the present invention provides a photographing apparatus including an image sensor, a lens, and the filter device as described above, wherein a rear end of the lens is disposed opposite to the image sensor, and the filter device is disposed at a front end of the lens.

The filter device is arranged at the front end of the lens and comprises a mounting base and at least one filter assembly, the mounting base is connected to the front end of the lens, and the filter assembly is mounted on the mounting base in a magnetic adsorption mode. The filter lens in the filter device is simple and convenient to disassemble and assemble, time consumption is short, and a large amount of photographic working time can be saved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic diagram of a filter device according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a filter device according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a mounting base according to an embodiment of the present invention;

FIG. 4 is an enlarged partial schematic view at A of FIG. 3;

FIG. 5 is a schematic diagram of a filter assembly according to an embodiment of the present invention;

FIG. 6 is an enlarged partial schematic view at B in FIG. 5;

FIG. 7 is a schematic diagram illustrating the distribution of magnetic members in a filter device according to an embodiment of the present invention;

FIG. 8 is a schematic view of a filter device according to an embodiment of the present invention;

FIG. 9 is an exploded view of the filter arrangement of FIG. 8;

FIG. 10 is a schematic cross-sectional view of the filter arrangement of FIG. 8;

fig. 11 is a partially enlarged schematic view at C in fig. 8.

Description of reference numerals:

1-mounting a base; 2. 2a, 2 b-a filter assembly; 11-light through hole; 12-a first housing chamber; 13 — a first positioning portion; 14-external thread; 21-filter fixing ring; 22-filter lens; 23, pressing a ring; 24-a magnetic member; 25-vertical grooves; 211-a second positioning portion; 212 — a second accommodating chamber; 213 — first adaptation; 214 — a second adaptation; 10-a filter device; 20-lens.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

When shooting equipment such as a camera, a video camera and the like is limited by shooting environment light rays or needs to create a special shooting effect in shooting operation, the shooting effect required to be achieved can be achieved by the action of filtering light rays with specific wavelengths through the filter. Specifically, the filter includes an ultraviolet filter (UV) for filtering ultraviolet rays, a Neutral density filter (ND) for reducing light intensity to reduce the amount of light passing through a lens, and a Circular Polarizer (CPL) for polarizing light to reduce surface reflection of a subject.

When in use, the filter is usually mounted in the form of an accessory at the front end of the lens of the shooting device, that is, at the end of the lens barrel of the lens far away from the image sensor. At the moment, when the lens is in light transmission, external light rays need to be filtered by the filter first and then can enter the inside of the lens, so that the filtering effect of the filter is realized.

The filter is usually used as an accessory of the lens, so that the filter is stably arranged at the front end of the lens of the shooting equipment and is convenient to assemble and disassemble on the lens.

Fig. 1 is a schematic external view of a filter device according to an embodiment of the present invention. Fig. 2 is a schematic structural diagram of a filter device according to an embodiment of the present invention. As shown in fig. 1 to 2, a filter device 10 of the present embodiment is configured to be disposed at a front end of a lens 20, the filter device 10 includes a mounting base 1 and at least one filter assembly 2, the mounting base 1 is configured to be connected to the front end of the lens 20, and the filter assembly 2 is mounted on the mounting base 1 in a magnetic adsorption manner.

Specifically, the mounting base 1 of the filter device 10, which serves as a medium for connecting the lens 20 and the filter assembly 2, may be disposed at the front end of the lens 20 in a detachable or non-detachable manner; the filter assembly 2 includes a filter lens 22, and when the filter assembly 2 is mounted on the mounting base 1, the filter lens 22 is located at a position in front of the lens 20, so as to filter the light of the lens 20.

In order to mount the filter assembly 2 on the mounting base 1, the filter assembly 2 and the mounting base 1 may be attached and mounted to each other by magnetic attraction. At least one of the filter assembly 2 and the mounting base 1 may have magnetism, and the other may be attracted by the magnetism of the former, so that the two are relatively fixed and connected. Wherein, let filter component 2 or mounting base 1 have magnetism or by the magnetic absorption, can be whole mounting base 1 or filter component 2 all utilize magnetism to adsorb each other, also can be mounting base 1 or partial structure among the filter component 2 mutual adsorption under the magnetic interaction. Specifically, when magnetic adsorption is realized, magnetic materials can be used for realizing magnetism so as to adsorb materials such as iron and nickel which can be magnetically adsorbed.

The number of the filter assemblies 2 may be one, or may be one or more. When the number of the filter assemblies 2 is plural, different types or different specifications of the filter assemblies 2 may be adopted to achieve different filtering effects.

Compared with the prior art in which the filter assembly 2 and the lens 20 are connected by fixing means such as threads, the filter assembly 2 and the mounting base 1 at the front end of the lens 20 are connected in a magnetic adsorption manner, so that the filter assembly is convenient to disassemble and assemble. Among the prior art, filter assembly 2 all need just can accomplish the screwing of screw thread through the mode of twisting soon or remove to screw when loading and unloading, and the dismouting process is comparatively hard and consuming time for a long time. In the invention, when the filter assembly 2 is installed on the installation base 1, the filter assembly 2 and the installation base 1 can be automatically adsorbed together under the action of magnetic force only by moving the filter assembly 2 to the magnetic force action range of the installation base 1; when the filter assembly 2 is detached, since there is no stopper structure between the filter assembly 2 and the mounting base 1, the filter assembly 2 can be detached from the mounting base 1 by applying a sufficient force to the filter assembly 2. Therefore, the filter assembly 2 is simple and convenient in disassembly and assembly processes, short in time consumption and capable of saving a large amount of photographing working time.

For further description of the filter device 10 of the present invention, the specific structure and possible connection of the components of the filter device 10, such as the mounting base 1 and the filter assembly 2, will be described in further detail below.

In order to satisfy a plurality of different filtering effects of the lens 20, as an optional mode, the number of the filter assemblies 2 is at least two, and the at least two filter assemblies 2 are sequentially connected along the axial direction of the lens 20. Since the filter assemblies 2 are all disposed at the front end of the lens 20, the external light needs to sequentially pass through two or more overlapped filter assemblies 2 before entering the lens 20, so as to reach the inside of the lens 20. In this way the filtering effects of the filter assemblies 2 can be superimposed to achieve a variety of different filtering effects or to improve filtering capabilities. The axial direction of the lens 20 is the optical axis direction of the lens 20, and for convenience of description, the axial direction of the lens 20 is hereinafter referred to as the optical axis direction.

For example, when the number of the filter assemblies 2 is more than one, a circular polarizer and a neutral gray filter may be included in the plurality of filter assemblies 2 to reduce the amount of light transmitted through the lens 20 and to reduce the reflected light on the surface of the object. Alternatively, two or more different neutral gray scale filters may be included in the plurality of filter assemblies 2 to substantially attenuate light passing through the lens 20 to further reduce the amount of light passing therethrough.

Since the connection between the filter assembly and the mounting base 1 is achieved by magnetic attraction, the magnetic attraction is limited by the size of the whole filter assembly 2 and the properties of the magnetic material, and the magnetic attraction can only generate magnetic force in a short distance. When the number of the filter assemblies 2 is more than one, the filter assemblies 2 which are not directly connected with the mounting base 1 may have a longer distance from the mounting base 1 because the plurality of filter assemblies 2 are sequentially connected along the axial direction of the lens 20, and at this time, the magnetic force applied to the filter assemblies 2 is small, and the self-gravity of the filter assemblies 2 may not be overcome, so that the filter assemblies 2 cannot be fixed on the lens 20. Thus, as an alternative embodiment, when there are a plurality of filter assemblies 2, of at least two filter assemblies 2 of the filter device 10, the filter assembly 2 not connected to the mounting base 1 may be mounted on the other filter assembly 2 by magnetic attraction.

At this time, not only the filter assemblies 2 may be connected to the mounting base 1 by a magnetic attraction manner, but also the different filter assemblies 2 may be connected to each other by a magnetic attraction manner. At this time, at least one of the plurality of different filter assemblies 2 may have magnetism, and the remaining filter assemblies 2 may be attracted by the filter assembly 2 having magnetism, thereby completing the relative fixation and connection. Wherein, let filter assembly 2 have magnetism or by the magnetic absorption, can be that whole filter assembly 2 all utilizes magnetism to adsorb each other, also can be partial structure among the filter assembly 2 mutual adsorption under the magnetic action.

Fig. 3 is a schematic structural diagram of a mounting base according to an embodiment of the present invention. Fig. 4 is a partially enlarged schematic view at a in fig. 3. As shown in fig. 1 to 4, when the filter assembly 2 and the lens 20 are connected by the mounting base 1, in order to avoid the structure of the mounting base 1 itself from blocking the light passing through the lens 20, the mounting base 1 may have a small size and structure, or an escape structure may be provided on the mounting base 1 to normally pass the light through the lens 20. Optionally, the mounting base 1 is provided with a light-passing hole 11 for passing light through the lens 20.

In this case, the mounting base 1 may be a frame or a ring structure, and encloses a hollow light-passing hole 11, and the light passing through the filter assembly 2 can be irradiated into the lens 20 through the light-passing hole 11. Generally, the light passing hole 11 of the mounting base 1 may be generally circular in order to match the shape of the lens in the lens 20, and the light passing hole 11 has a large enough inner diameter to avoid blocking light entering the lens 20.

When the mounting base 1 and the filter assembly 2 are connected by means of magnetic attraction, because magnetic force only provides attraction force close to each other for the mounting base 1 and the filter assembly 2, in order to prevent the mounting base 1 and the filter assembly 2 from moving relatively in other directions, optionally, a mounting structure may be provided on the mounting base 1 or the filter assembly 2, so that the filter assembly 2 is fixed on the mounting base 1 by the mounting structure. Among them, in order to simplify the structure of the filter assembly 2 and reduce the size of the filter assembly 2, a mounting structure is generally provided on the mounting base 1.

As an alternative embodiment, a first accommodating cavity 12 may be formed on a side of the light-passing hole 11 facing away from the front end of the lens 20, and the first accommodating cavity 12 is used for accommodating at least part of the structure of the filter assembly 2.

Specifically, one side of the first accommodating cavity 12, which is away from the front end of the lens 20, may form an opening, and at least a part of the structure of the filter assembly 2 may enter the first accommodating cavity 12 through the opening, and the inner wall of the first accommodating cavity 12 may limit the filter assembly 2 in the radial direction of the lens 20, so that the filter assembly 2 may not generate the radial play and displacement of the lens 20. The first accommodating cavity 12 may be a whole structure for accommodating the filter assembly 2, or may be a part of structure for accommodating the filter assembly 2, and in order to reduce the overall size of the mounting base 1, the first accommodating cavity 12 may only accommodate a part of structure of the filter assembly 2 facing the lens 20.

In order to form a good limit for the filter assembly 2, the shape of the inner wall of the first accommodating cavity 12 can be matched with the shape of the outer wall of the filter assembly 2. For example, since the outer wall of the filter assembly 2 is generally in the shape of a solid of revolution, accordingly, as an alternative, the first housing chamber 12 may have an annular chamber wall, and the filter assembly 2 may be rotatably disposed in the first housing chamber 12.

At this time, since the filter assembly 2 can rotate in the first receiving cavity 12, a circular lens, such as a circular polarizer, which needs to be rotated, may be included in the filter assembly 2. The circular polarizer can obtain different polarization angles of light rays through rotation of the lens, so that different polarization effects are realized. The circular cavity wall of the first accommodating cavity 12 allows the circular polarizer to rotate therein, thereby adjusting the polarization effect.

In addition, in order to improve the compatibility of the filter device 10, the filter assembly 2 in the filter device 10 can be replaced with the existing conventional filter assembly 2, i.e. the mounting base 1 in the present invention can also be used to connect the existing filter assembly 2. At this time, in order to effectively connect the conventional filter assembly 2, an inner thread for screwing with the filter assembly 2 is optionally provided on the annular chamber wall of the first accommodating chamber 12. Wherein the filter assembly 2 to which the internal threads are connected may be the filter assembly 2 connected to the lens 20 by the threads in the related art. In addition, an external thread may be formed on an outer wall of the filter assembly 2 of the present invention, so that the filter assembly 2 may be connected to the mounting base 1, or may be directly connected to the front end of the existing lens 20 by screwing.

When the filter assembly 2 is partially accommodated in the first accommodating cavity 12, in order to limit the radial position of the filter assembly 2, optionally, a first positioning portion 13 protruding toward the center of the lens 20 is disposed in the light-passing hole 11, and the first positioning portion 13 is used for limiting the axial position of the filter assembly 2 in the first accommodating cavity 12. Specifically, since the projections of the first positioning portion 13 and the filter assembly 2 in the axial direction of the lens 20 overlap with each other, when the filter assembly 2 moves to a position where it abuts against the first positioning portion, it is restricted by the first positioning portion 13 and cannot move any further.

Specifically, the first positioning portion 13 may have a variety of different forms and configurations. For example, as an alternative structure, the first positioning portion 13 may be a positioning step provided on an inner wall of the light passing hole 11. At this time, the inner diameter of the hole segment of the light passing hole 11 connected to the first receiving cavity 12 is smaller than the inner diameter of the first receiving cavity 12, so that a positioning step is formed at the boundary between the first receiving cavity 12 and other hole segments of the light passing hole 11 due to the difference of the inner diameters, and the positioning step can be used for limiting the axial position of the filter assembly 2.

The first positioning portion 13 may also have other structures, for example, the first positioning portion may be one or more protrusions disposed on the inner wall of the light-passing hole 11, and when the filter assembly 2 moves in the first accommodating cavity 12 to abut against the protrusions, the filter assembly is limited by the protrusions and cannot move continuously in the axial direction.

In this way, the mounting base 1 can fix and position the filter assembly 2 by the mounting structure such as the first positioning portion 13, so that the filter assembly 2 and the lens 20 can be relatively fixed.

When the mounting base 1 is mounted to the front end of the lens 20, the mounting base 1 can be connected by means of the existing mounting structure of the front end of the lens 20, thereby being suitable for the existing lens 20. In the conventional lens 20, a screw structure for mounting a conventional filter is generally provided at the front end, and accordingly, as an alternative embodiment, the side of the mounting base 1 facing the front end of the lens 20 may have a cylindrical outer wall provided with an external screw 14 for screwing with the front end of the lens 20.

At this time, the size of the cylindrical outer wall is matched with the size of the front end of the lens 20, so that the mounting base 1 is screwed with the screw structure of the front end of the lens 20 through the external thread 14, and the filter device 10 is fixed to the front end of the lens 20.

In addition, the mounting base 1 may also be connected to the front end of the lens 20 by other means, such as being clamped by an elastic clamping structure, or being connected by interference fit, etc., which is not limited herein.

Fig. 5 is a schematic structural diagram of a filter assembly according to an embodiment of the present invention. Fig. 6 is a partially enlarged schematic view at B in fig. 5. As shown in fig. 1 to 6, in order to reliably connect to the mounting base 1 while performing a normal filtering function, as an alternative embodiment, the filter assembly 2 includes a filter fixing ring 21 and a filter lens 22, the filter lens 22 is fixed inside the filter fixing ring 21, and the filter fixing ring 21 is used to connect to the mounting base 1 or other filter assemblies by magnetic attraction.

The filter 22 may be a uv filter, a neutral density filter, a circular polarizer, or other different filters. Because the filter lens 22 is generally made of materials such as optical glass with relatively brittle texture, and it is not easy to directly set a mounting structure on the filter lens 22, the filter assembly 2 further includes a filter fixing ring 21, and the filter fixing ring 21 is disposed around the outside of the filter lens 22, so as to protect the filter lens 22 to a certain extent, and facilitate connection with other components or structures.

When the filter lens 22 is fixed to the filter fixing ring 21, since the filter lens is generally a sheet-like structure having a relatively simple structure, the filter lens may have a position-limiting and mounting structure for facilitating fixing of the sheet-like structure. Optionally, a second positioning portion 211 protruding toward the center of the filter fixing ring 21 is disposed on the inner wall of the filter fixing ring 21, and the second positioning portion 211 abuts against the filter lens 22, so that the axial position of the filter lens 22 in the filter fixing ring 21 can be limited.

Specifically, the second positioning portions 211 may also have a variety of different structures and types, similar to the first positioning portions 13. For example, the second positioning portion 211 may alternatively be a stepped surface provided on the inner wall of the filter fixing ring 21. At this time, different portions of the inner wall of the filter fixing ring 21 in the axial direction have different inner diameters, and thus a stepped surface is formed, and the filter lens 22 can be brought into contact with the stepped surface, thereby fixing in the axial direction.

In addition, the second positioning portion 211 may also be a bump disposed on the inner wall of the filter fixing ring 21, or other positioning structures commonly used by those skilled in the art, and will not be described herein again.

In addition, since the second positioning portion 211 limits the filter lens 22 only in one direction along the axial direction of the lens 20, the opposite direction of the filter lens 22 is not limited yet. Therefore, optionally, the filter assembly 2 may further include a press ring 23, the press ring 23 is disposed on the inner side of the filter fixing ring 21, the press ring 23 is located on a side of the filter lens away from the second positioning portion 211, and the press ring 23 may be configured to clamp the filter lens together with the second positioning portion 211, so that the axial position of the filter lens is fixed.

Optionally, the outer edge shape of the pressing ring 23 is matched with the inner wall shape of the filter fixing ring 21, so that the pressing ring 23 can be fixed on the inner wall of the filter fixing ring 21, the pressing ring 23 is accommodated in the filter fixing ring 21, and the appearance of the filter assembly 2 is simple.

Further, since the pressing ring 23 and the filter fixing ring 21 are both small in size, in order to provide a structure for connecting the pressing ring 23 and the filter fixing ring 21 in a limited space, the outer edge of the pressing ring 23 and the inner wall of the filter fixing ring 21 can be both circular in shape, and the pressing ring and the filter fixing ring 21 can be mounted or dismounted by means of relative rotation between the inner walls of the pressing ring and the filter fixing ring 21. Specifically, the connection or disconnection between the pressing ring 23 and the filter fixing ring 21 can be performed depending on different rotational positions.

For example, in an alternative connection mode, the outer edge of the pressing ring 23 has an external thread, the inner edge of the filter fixing ring 21 is provided with an internal thread matched with the external thread on the pressing ring 23, and the pressing ring 23 is screwed with the filter fixing ring 21 through the matching of the external thread and the internal thread. When the press ring 23 needs to be mounted or the press ring 23 and the filter lens 22 need to be detached from the filter fixing ring 21, the press ring 23 can be mounted or detached from the filter fixing ring 21 by screwing or unscrewing the external thread on the press ring 23 and the internal thread of the filter fixing ring 21.

In another alternative connection method, one or more engaging portions may be provided at intervals between the pressing ring 23 and the filter fixing ring 21, the pressing ring 23 and the filter fixing ring 21 may be connected by being engaged with each other by rotation, and the filter lens 22 may be interposed between the pressing ring 23 and the filter fixing ring 21.

And in order to allow the filter assembly 2 and the mounting base 1 to be attracted to each other by magnetic force. The filter assembly 2 may be magnetic, or the mounting base 1 may be magnetic. In order to facilitate the mutual magnetic attraction between different filter assemblies 2, the filter assemblies 2 are usually made to have magnetism, and the mounting base 1 can be attracted by the magnetism of the filter assemblies 2 to complete the connection between the filter assemblies 2 and the mounting base 1.

When the filter assembly 2 generates magnetism, the filter assembly 2 may have other structures except the filter lens 22, for example, the entire filter fixing ring 21 is made of a magnetic material, or a part of the filter fixing ring 21 in the filter assembly 2 may have a magnetic material. When part of the structure of the filter fixing ring 21 is made of a magnetic material, as an optional structure, the filter assembly 2 includes at least one magnetic member 24, the filter fixing ring 21 is provided with at least one second accommodating cavity 212, and the magnetic member 24 is disposed in the second accommodating cavity 212.

At this time, the magnetic element 24 is disposed in the second receiving cavity 212, so that the magnetic element 24 may have a proper size and a regular shape, thereby ensuring that the magnetic element 24 has a reliable magnetic attraction capability. In addition, the magnetic part 24 is specially used for generating magnetic force and is not used as a bearing structure of the filter fixing ring 21, so that the magnetic part 24 does not need to be processed into a complex bearing structure, and the manufacturing cost is lower.

Wherein the magnetic member 24 can be of a variety of different types. Alternatively, the magnetic member 24 may be a permanent magnet, such as a magnet or an alnico alloy, and the permanent magnet may have strong magnetism without being energized, so that the magnetic member 24 made of the permanent magnet is convenient to use, has a small external dimension, and is suitable for being applied to the filter device 10.

When the magnetic member 24 is arranged, on one hand, it is required to ensure that the magnetic force of the magnetic member 24 can maximally realize the magnetic attraction between the mounting base 1 and the filter assembly 2; on the other hand, when there are a plurality of filter assemblies 2, it is necessary to attach the different filter assemblies 2 to each other by the magnetic member 24. Thus, alternatively, the magnetic pole direction of the magnetic member 24 may be along the axial direction of the lens 20. In this way, since the magnetic member 24 has a strong magnetic force in the magnetic pole direction, the magnetic pole direction of the magnetic member 24 is along the axial direction of the lens 20, and the maximum magnetic force direction of the magnetic member 24 can be directed to the connection direction between the mounting base 1 and the filter assembly 2, thereby ensuring the reliable connection between the mounting base 1 and the filter assembly 2. In addition, when there are a plurality of filter assemblies 2, since the magnetic pole directions of the magnetic members 24 are all along the axial direction of the lens 20, the filter assemblies 2 sequentially arranged along the axial direction of the lens 20 can be connected by mutual attraction between the magnetic poles of the magnetic members 24. At this time, the magnetic members 24 of two adjacent filter assemblies 2 maintain opposite magnetic polarities, for example, the N pole of the magnetic member 24 of the previous filter assembly 2 is close to and opposite to the S pole of the magnetic member 24 of the next filter assembly 2.

Optionally, the second accommodating cavity 212 has an opening facing the front end of the lens 20. The magnetic member 24 can be inserted into the second receiving cavity 212 through the opening and fixed inside the filter fixing ring 21. The magnetic member 24 may be fixed in the second receiving cavity 212 in various ways, for example, a fixing structure may be provided on the filter fixing ring 21, or the magnetic member may be installed in the second receiving cavity 212 by interference fit. Alternatively, the magnetic member 24 may be disposed in the second receiving cavity 212 by an adhesive. Thus, an additional fixing structure is not required, and the structure of the filter fixing ring 21 is simple.

At this time, the opening of the second receiving cavity 212 may be located on the end surface of the filter fixing ring 21, and the end surface of the filter fixing ring 21 is a plane. The magnetic element 24 can be disposed in the second receiving cavity 212 through the opening on the end surface. Because filter assembly 2 is when being connected with mounting base 1 or other filter assemblies, the terminal surface of the solid fixed ring 21 of filter generally can with parts butt such as mounting base, with the opening setting of second holding chamber 212 on the terminal surface, magnetism piece 24 all can have nearer interval with mounting base 1, improves filter assembly 2's magnetic adsorption effect.

When the magnetic member 24 is disposed in the second receiving cavity 212, in order to prevent the magnetic member 24 from affecting the connection between the filter fixing ring 21 and other components, the magnetic member 24 may be completely received in the second receiving cavity 212. At this time, the magnetic member 24 does not protrude from the end surface of the filter fixing ring 21, and therefore, the connection between the filter fixing ring 21 and other components is not hindered, and the filter fixing ring 21 has a clean appearance.

As an alternative embodiment, the outer surface of the magnetic element 24 may be flush with the end surface of the second receiving cavity 212 where the opening is located. Thus, the outer surface of the magnetic member 24 and the end surface of the filter fixing ring 21 are located on the same surface, so that the filter assembly 2 has a smoother appearance and a better aesthetic appearance. In addition, the outer surface of the magnetic element 24 may be slightly lower than the end surface of the second receiving cavity 212 where the opening is located, so that the magnetic element 24 is hidden, and the overall aesthetic property of the filter assembly 2 can be improved.

In order to secure the magnetic attraction effect between the filter assembly 2 and the mounting base 1, the magnetic member 24 is optionally located on the side of the filter fixing ring 21 toward the front end of the lens 20. And at this moment, the position of the magnetic member 24 is close to the front end of the lens 20 and is close to the mounting base 1, so that magnetic attraction between the magnetic member and the mounting base 1 is realized.

In addition, fig. 7 is a schematic distribution diagram of the magnetic members in the filter device according to the first embodiment of the present invention. As shown in fig. 7, alternatively, the number of the magnetic members 24 is plural, and the plural magnetic members 24 are spaced apart from each other in the circumferential direction of the filter fixing ring 21. At this time, different positions in the circumferential direction of the filter fixing ring 21 can achieve a magnetic adsorption effect through the magnetic pieces 24 at corresponding positions, and the connection between the filter fixing ring 21 and the mounting base 1 is reliable.

In addition, the magnetic member 24 may also have other optional setting manners, for example, the magnetic member 24 may be an arc-shaped long strip structure, and the magnetic member 24 is disposed along the circumferential direction of the filter fixing ring 21, so that different positions in the circumferential direction of the filter fixing ring 21 can be magnetically adsorbed by the magnetic member only by using a small number of magnetic members (one or two arc-shaped magnetic members 24), and the filter fixing ring 21 and the mounting base 1 are reliably connected.

When two or more filter assemblies 2 are provided in the filter device 10, the filter assemblies 2 need to have coupling structures that are matched with each other in order to couple the plurality of filter assemblies 2, which are distributed in the axial direction, to each other. As an alternative connection structure, an end of the filter fixing ring 21 facing away from the front end of the lens 20 has a first fitting portion 213, and an end of the filter fixing ring 21 facing the front end of the lens 20 has a second fitting portion 214 matching the shape of the first fitting portion 213.

At this time, since each filter assembly 2 has the first fitting part 213 and the second fitting part 214 which are matched with each other, the two filter assemblies 2 can be coupled together in tandem by using the shape matching between the first fitting part 213 and the second fitting part 214. While the shapes of the first fitting part 213 and the second fitting part 214 do not interfere with the connection between the mounting base 1 and the filter assembly 2.

Specifically, fig. 8 is a schematic connection diagram of a filter device according to an embodiment of the present invention. Fig. 9 is an exploded view of the filter arrangement of fig. 8. Fig. 10 is a schematic cross-sectional view of the filter device of fig. 8. Fig. 11 is a partially enlarged schematic view at C in fig. 8. As shown in fig. 8 to 11, as an alternative connection manner, when the number of the filter assemblies 2 is at least two, in the two

filter assemblies

2a and 2b, the second adapting portion 214 of the filter fixing ring 21 of the previous filter assembly 2a in the axial direction of the lens 20 may be correspondingly connected to the first adapting portion 213 of the filter fixing ring 21 of the subsequent filter assembly 2 b. In particular, the second fitting part 214 and the first fitting part 213 may have structures that can cooperate with each other, for example, they may have complementary shapes.

Alternatively, the first fitting part 213 may be an opening, and the second fitting part 214 may be inserted into the opening. At this time, since the first fitting portion 213 is located on the side of the filter fixing ring 21 away from the front end of the lens 20, even if the first fitting portion 213 is large in size, the connection between the filter fixing ring 21 and the mount base 1 is not affected. And because the filter assembly 2 is provided with the magnetic adsorption structures such as the magnetic part 24, the first adaptation part 213 and the second adaptation part 214 can be adsorbed and connected together by the front and the rear filter assemblies 2 only by being connected in a plugging mode, and the connection process is simple and rapid.

Further, the second fitting part 214 toward the front end of the lens 20 may be used not only for connection with other filter assemblies but also for connection with the mounting base 1. At this time, the shape and structure of the second adapting portion 214 are matched with the corresponding structure on the mounting base 1, for example, when the mounting base 1 includes the first receiving cavity 12, the shape of the second adapting portion 214 can be matched with the opening shape of the first receiving cavity 12 so as to be installed in the first receiving cavity. Accordingly, the mounting base 1 may also be provided with a structure for avoiding or accommodating the second adapter 214. For example, the opening shape of the first accommodating chamber 12 of the mounting base 1 and the outer shape of the second adapting portion 214 can be matched with each other.

When the number of the filter assemblies 2 is plural, since the filter assemblies 2 such as the polarizer may need to rotate around the optical axis of the lens 20 when in use, different filter assemblies 2 may also be configured to rotate relatively to each other, so as to avoid affecting the normal operation of a single filter assembly 2. At this time, in order to realize the relative rotation between the front and rear filter assemblies 2, it is optional that the second fitting portion 214 is a rotational body, and the inner wall of the first fitting portion 213 is annular. At this time, the second adapting portion 214 inserted into the first adapting portion 213 can rotate relatively around the axial direction of the lens 20, and drives the two filter assemblies 2 to rotate relatively. When the two filter assemblies 2 rotate relatively, the filter lens 22 rotates along with the two filter assemblies, and different filtering effects are generated. For example, when the filter lens is a circular polarizer, the polarization effect on the external light can be changed by the rotation of the filter assembly 2, so as to realize different light reflections; when the filter lens is a neutral gray level gradient filter lens, the up-down position of the light reduction area of the filter lens can be adjusted by rotating the filter lens, so that different light reduction effects are realized.

The second fitting portion 214 may be a cylindrical or conical body, which is relatively simple and may be conveniently inserted into the first fitting portion 213 or separated from the first fitting portion 213, thereby improving the assembly and disassembly efficiency of the filter assembly 2.

In addition, the first adapting portion 213 and the second adapting portion 214 can also be in other structures and shapes, for example, the first adapting portion 213 and the second adapting portion 214 can be both snap rings, or other connecting structures capable of satisfying the connection and positioning between two adjacent filter assemblies 2, which will not be described in detail herein.

In addition, to facilitate rotation of the filter assembly 2, in an alternative embodiment, the outer wall of the filter fixing ring 21 is provided with anti-slip threads to facilitate the user to rotate the filter assembly 2 with his fingers. The anti-skid lines on the filter fixing ring 21 may be a plurality of vertical grooves 25 along the axial direction of the lens 20, or may be net-shaped anti-skid lines, or the outer wall of the filter fixing ring 21 may also be provided with an anti-skid skin or a rubber anti-skid layer having a frosted surface, which is not limited herein.

In this embodiment, the filter device is used for setting up the front end at the camera lens, and the filter device includes mounting base and at least one filter subassembly, and the mounting base is used for connecting the front end at the camera lens, and the filter subassembly passes through the magnetic adsorption mode and installs on the mounting base. The filter lens in the filter device is simple and convenient to disassemble and assemble, time consumption is short, and a large amount of photographic working time can be saved.

The invention also provides shooting equipment which comprises an image sensor, a lens and the filter device in the embodiment, wherein the rear end of the lens is arranged opposite to the image sensor, and the filter device is arranged at the front end of the lens and is used for filtering light rays entering the lens, so that a special visual effect is realized. The detailed structure, function and operation principle of the filter device have been described in detail in the foregoing embodiments, and are not described herein again.

Specifically, the camera device generally includes a housing as a main body, the image sensor is accommodated in the housing, and the rear end of the lens can be connected to the housing through a bayonet. And the front end of the lens is provided with a filter device.

The filter device can be detachably connected with the lens, for example, the filter device is screwed with the front end of the lens through threads on a mounting base in the filter device. In addition, the filter device can also be connected with the front end of the lens in a non-detachable mode. At this time, optionally, the mounting base and the lens of the filter device may be of an integral structure. Therefore, when the lens is produced, the shape and the structure of the mounting base can be directly formed at the front end of the lens, so that the front end of the lens is directly connected with the filter assembly.

In this embodiment, the photographing apparatus includes an image sensor, a lens and a filter device, the rear end of the lens is disposed opposite to the image sensor, and the filter device is disposed at the front end of the lens; the filter device is used for being arranged at the front end of the lens and comprises a mounting base and at least one filter assembly, the mounting base is used for being connected to the front end of the lens, and the filter assembly is mounted on the mounting base in a magnetic adsorption mode. The filter lens in the shooting equipment is simple and convenient to disassemble and assemble, time consumption is short, and a large amount of shooting working time can be saved.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

The utility model provides a filter device for set up the front end at the camera lens, its characterized in that, filter device includes mounting base and at least one filter subassembly, mounting base is used for connecting the front end of camera lens, the filter subassembly passes through the magnetic adsorption mode and installs on the mounting base.
The filter device according to claim 1, wherein the number of the filter assemblies is at least two, and at least two of the filter assemblies are sequentially connected in an axial direction of the lens.
The filter device according to claim 2, wherein at least two of the filter assemblies are mounted on the other filter assembly by magnetic attraction without being connected to the mounting base.
A filter arrangement as claimed in any one of claims 1 to 3 wherein at least part of the structure of the mounting base is magnetic and at least part of the structure in the filter assembly is of a material which is magnetically attracted to the magnetic member; or,

at least part of the structure of the mounting base is made of a material which can be magnetically attracted by a magnetic piece, and at least part of the structure in the filter assembly has magnetism.
The filter device of claim 4, wherein the mounting base defines a light hole for the lens to pass light.
The filter device of claim 5, wherein a side of the light-passing hole facing away from the front end of the lens forms a first receiving cavity for receiving at least part of the structure of the filter assembly.
The filter device of claim 6, wherein the first housing chamber has an annular chamber wall, the filter assembly being rotatably disposed within the first housing chamber.
The filter device of claim 7, wherein the annular chamber wall has internal threads thereon for threaded engagement with the filter assembly.
The filter device according to claim 6, wherein a first positioning portion protruding toward the center of the lens is disposed in the light-passing hole, and the first positioning portion is used for limiting the axial position of the filter assembly in the first accommodating cavity.
The filter device according to claim 9, wherein the first positioning portion is a positioning step provided on an inner wall of the light passing hole.
A filter device according to any one of claims 5-10, wherein the side of the mounting base facing the front end of the lens has a cylindrical outer wall provided with an external thread for screwing with the front end of the lens.
The filter device of claim 4, wherein the filter assembly comprises a filter fixing ring and a filter lens, the filter lens is fixed inside the filter fixing ring, and the filter fixing ring is used for being connected with the mounting base or other filter assemblies in a magnetic adsorption manner.
The filter device according to claim 12, wherein a second positioning portion that protrudes toward a center direction of the filter fixing ring is provided on an inner wall of the filter fixing ring, and the second positioning portion abuts against the filter lens to restrict an axial position of the filter lens in the filter fixing ring.
The filter device according to claim 13, wherein the second positioning portion is a stepped surface provided on an inner wall of the filter fixing ring.
The filter device according to claim 13, wherein the filter assembly further comprises a press ring, the press ring is disposed on an inner side of the filter fixing ring, the press ring is located on a side of the filter lens away from the second positioning portion, and the press ring is used for clamping the filter lens together with the second positioning portion.
The filter device of claim 15, wherein the shape of the outer edge of the press ring matches the shape of the inner wall of the filter holder ring.
The filter device according to claim 16, wherein the outer edge of the press ring and the inner wall of the filter fixing ring are both circular in shape.
The filter device according to claim 17, wherein the outer edge of the pressing ring has an external thread, the inner edge of the filter fixing ring is provided with an internal thread matched with the external thread on the pressing ring, and the pressing ring is screwed with the filter fixing ring through the matching of the external thread and the internal thread.
The filter device of any one of claims 12-18, wherein the filter assembly comprises at least one magnetic member, the filter retaining ring defines at least one second receiving cavity, and the magnetic member is disposed in the second receiving cavity.
The filter device of claim 19, wherein the second receiving chamber has an opening facing the lens front end.
The filter device of claim 20, wherein the opening of the second receiving cavity is located on an end surface of the filter fixing ring, and the end surface of the filter fixing ring is a plane.
The filter device of claim 21, wherein the magnetic member is completely received within the second receiving cavity.
The filter device of claim 22, wherein the outer surface of the magnetic member is flush with the end surface of the second receiving cavity at which the opening is located.
A filter arrangement as claimed in any one of claims 20 to 23, wherein the magnetic element is located on a side of the filter retainer ring facing the front end of the lens.
The filter device of claim 19, wherein the magnetic member is disposed within the second receiving cavity by an adhesive.
The filter device of claim 19, wherein the number of the magnetic members is plural, and the plural magnetic members are spaced apart from each other in a circumferential direction of the filter fixing ring.
The filter device of claim 19, wherein the magnetic member is a permanent magnet.
The filter device of claim 27, wherein the magnetic pole direction of the magnetic member is along the axial direction of the lens.
A filter arrangement as claimed in any one of claims 12 to 18, wherein the filter retainer ring is a magnetic body.
The filter device according to claim 29, wherein a magnetic pole direction of the filter fixing ring is along an axial direction of the lens.
The filter device according to any one of claims 12 to 18, wherein an end of the filter fixing ring facing away from the lens front end has a first fitting portion, and an end of the filter fixing ring facing toward the lens front end has a second fitting portion matching a shape of the first fitting portion.
The filter device according to claim 31, wherein the number of the filter assemblies is at least two, and of the at least two filter assemblies, the second adapting portion of the filter fixing ring of the previous filter assembly in the axial direction of the lens is correspondingly connected to the first adapting portion of the filter fixing ring of the subsequent filter assembly.
The filter device of claim 31, wherein the first adapter portion is an opening and the second adapter portion is insertable into the opening.
The filter device of claim 33, wherein the second mating portion is a solid of revolution and the inner wall of the first mating portion is annular.
The filter device of claim 34, wherein the second adaptation is a cylinder or a cone.
The filter device according to any of claims 12 to 18, wherein the filter lens is a circularly polarizing lens, a neutral gray filter or an ultraviolet filter.
A filter arrangement as claimed in any one of claims 12 to 18, wherein the outer wall of the filter retainer ring is provided with an anti-slip texture.
The shooting equipment is characterized by comprising an image sensor, a lens and a filter device, wherein the rear end of the lens is arranged opposite to the image sensor, and the filter device is arranged at the front end of the lens; the filter device comprises a mounting base and at least one filter assembly, wherein the mounting base is used for being connected to the front end of the lens, and the filter assembly is installed on the mounting base in a magnetic adsorption mode.
The photographing apparatus according to claim 38, wherein the number of the filter assemblies is at least two, and at least two of the filter assemblies are sequentially connected in an axial direction of the lens.
The photographing apparatus according to claim 39, wherein, of the at least two filter assemblies, a filter assembly not connected to the mounting base is mounted on the other filter assembly by a magnetic attraction manner.
The photographing apparatus according to any one of claims 38 to 40, wherein at least a part of the structure of the mounting base has magnetism, and at least a part of the structure of the filter assembly is made of a material that can be magnetically attracted by the magnetic member; or,

at least part of the structure of the mounting base is made of a material which can be magnetically attracted by a magnetic piece, and at least part of the structure in the filter assembly has magnetism.
The camera device as claimed in claim 41, wherein the mounting base is provided with a light passing hole for passing light through the lens.
The shooting device of claim 42, wherein a side of the light through hole facing away from the lens front end forms a first accommodating cavity for accommodating at least part of the structure of the filter assembly.
The camera device of claim 43, wherein the first housing chamber has an annular chamber wall, and wherein the filter assembly is rotatably disposed within the first housing chamber.
The camera device of claim 44, wherein the annular chamber wall has internal threads disposed thereon for threaded engagement with the filter assembly.
The camera of claim 43, wherein a first positioning portion protruding toward a center of the lens is disposed in the light-passing hole, and the first positioning portion is configured to limit an axial position of the filter assembly in the first accommodating cavity.
The photographing apparatus according to claim 46, wherein the first positioning portion is a positioning step provided on an inner wall of the light passing hole.
The photographing apparatus according to any one of claims 42 to 47, wherein a side of the mounting base facing the lens front end has a cylindrical outer wall provided with an external thread for screwing with the lens front end.
The camera apparatus according to claim 41, wherein the filter assembly includes a filter fixing ring and a filter lens fixed to an inner side of the filter fixing ring, and the filter fixing ring is configured to be connected to the mounting base or other filter assemblies by a magnetic attraction.
The photographing apparatus according to claim 49, wherein a second positioning portion that protrudes toward a center direction of the filter fixing ring is provided on an inner wall of the filter fixing ring, the second positioning portion abutting against the filter lens to restrict an axial position of the filter lens in the filter fixing ring.
The photographing apparatus according to claim 50, wherein the second positioning portion is a stepped surface provided on an inner wall of the filter fixing ring.
The shooting device of claim 50, wherein the filter assembly further comprises a press ring, the press ring is arranged on the inner side of the filter fixing ring, the press ring is located on one side, away from the second positioning portion, of the filter lens, and the press ring is used for clamping the filter lens together with the second positioning portion.
The photographing apparatus according to claim 52, wherein an outer edge shape of the pressing ring and an inner wall shape of the filter fixing ring are matched with each other.
The image capturing apparatus according to claim 53, wherein the outer edge of the pressure ring and the inner wall of the filter fixing ring are both circular in shape.
The shooting device of claim 54, wherein the outer edge of the pressing ring is provided with an external thread, an internal thread matched with the external thread on the pressing ring is arranged on the inner edge of the filter fixing ring, and the pressing ring is in threaded connection with the filter fixing ring through the matching of the external thread and the internal thread.
The camera device of any one of claims 49-55, wherein the filter assembly comprises at least one magnetic member, the filter retaining ring defines at least one second receiving cavity, and the magnetic member is disposed in the second receiving cavity.
The camera of claim 56, wherein the second housing cavity has an opening facing the lens front end.
The photographing apparatus according to claim 57, wherein an opening of the second receiving chamber is located on an end surface of the filter fixing ring, and the end surface of the filter fixing ring is a plane.
The camera of claim 58, wherein the magnetic member is completely received in the second receiving cavity.
The camera of claim 59, wherein an outer surface of the magnetic member is flush with an end surface of the second receiving cavity where the opening is located.
The photographing apparatus according to any one of claims 57 to 60, wherein the magnetic member is located on a side of the filter fixing ring facing the lens front end.
The camera of claim 56, wherein the magnetic member is disposed in the second housing cavity by an adhesive.
The photographing apparatus according to claim 56, wherein the magnetic member is plural in number, and the plural magnetic members are spaced apart in a circumferential direction of the filter fixing ring.
The camera of claim 56, wherein the magnetic member is a permanent magnet.
The photographing apparatus according to claim 64, wherein a magnetic pole direction of the magnetic member is along an axial direction of the lens.
The photographing apparatus according to any one of claims 49 to 55, wherein the filter fixing ring is a magnetic body.
The photographing apparatus according to claim 66, wherein a magnetic pole direction of the filter fixing ring is along an axial direction of the lens barrel.
The photographing apparatus according to any one of claims 49 to 55, wherein an end of the filter fixing ring facing away from the lens front end has a first fitting portion, and an end of the filter fixing ring facing toward the lens front end has a second fitting portion matching a shape of the first fitting portion.
The photographing apparatus according to claim 68, wherein the number of the filter assemblies is at least two, and of the at least two filter assemblies, the second fitting portion of the filter fixing ring of the preceding filter assembly in the axial direction of the lens is correspondingly connected to the first fitting portion of the filter fixing ring of the succeeding filter assembly.
The camera apparatus of claim 68, wherein the first adapter portion is an opening into which the second adapter portion is insertable.
The image capturing apparatus according to claim 70, wherein the second fitting portion is a solid of revolution, and an inner wall of the first fitting portion is annular.
The camera apparatus of claim 71, wherein the second adaptation portion is a cylinder or a cone.
The photographing apparatus of any one of claims 49 to 55, wherein the filter lens is a circularly polarizing lens, a neutral gray filter, or an ultraviolet filter.
The photographing apparatus of any one of claims 49 to 55, wherein an outer wall of the filter fixing ring is provided with an anti-slip texture.
The camera apparatus of any of claims 38-40, wherein the mounting base of the filter device is a unitary structure with the lens.