CN216531533U

CN216531533U - Lens focusing mechanism and camera

Info

Publication number: CN216531533U
Application number: CN202123425418.1U
Authority: CN
Inventors: 徐伟
Original assignee: Hangzhou Micro Image Software Co ltd
Current assignee: Hangzhou Micro Image Software Co ltd
Priority date: 2021-12-29
Filing date: 2021-12-29
Publication date: 2022-05-13
Anticipated expiration: 2031-12-29

Abstract

The utility model discloses a lens focusing mechanism and a camera, wherein the lens focusing mechanism comprises a focusing base, a linear driving assembly and a detector assembly, wherein the linear driving assembly is fixed on the focusing base; the detector assembly is connected with a driving shaft of the linear driving assembly; the linear driving assembly drives the detector assembly to move linearly along the optical axis direction. The lens focusing mechanism in the technical scheme of the utility model can simplify the structure, reduce the cost and improve the focusing reliability.

Description

Lens focusing mechanism and camera

Technical Field

The utility model relates to the technical field of cameras, in particular to a lens focusing mechanism and a camera.

Background

In taking a picture or taking an image, focusing is generally performed in order to obtain a higher definition image. Although an automatic back focus focusing mechanism is arranged in the existing camera, the combination of a conventional motor and a transmission mechanism is mostly selected and converted into linear driving, the driving force of the structure is insufficient, the situation of action locking easily occurs due to the matching of multiple parts, and the reliability is poor.

SUMMERY OF THE UTILITY MODEL

The utility model mainly aims to provide a lens focusing mechanism, which aims to meet the focusing requirement and has high reliability.

In order to achieve the purpose, the lens focusing mechanism provided by the utility model comprises a focusing base, a linear driving assembly and a detector assembly, wherein the linear driving assembly is fixed on the focusing base; the detector assembly is connected with a driving shaft of the linear driving assembly; the linear driving assembly drives the detector assembly to move linearly along the optical axis direction.

In a possible embodiment of the present application, the focus base is a cylinder structure with at least one open end, and the linear driving assembly is fixed at the open end of the focus base.

In a possible embodiment of the present application, the lens focusing mechanism further includes a focusing inner tube, the focusing inner tube is sleeved in the tube structure of the focusing base, and an inner wall of the focusing inner tube is respectively connected to the driving shaft of the linear driving assembly and the detector assembly;

the linear driving assembly drives the focusing inner barrel to linearly move in the focusing base along the optical axis direction and drives the detector assembly to linearly move together.

In a possible embodiment of the present application, a limiting hole is formed in a peripheral wall of the focusing base, and the limiting hole extends in the optical axis direction;

the periphery wall of focusing inner tube is connected with a locating part, the locating part in the limiting hole is downthehole to be restricted to remove along the optical axis direction, in order to restrict the circumferential direction takes place for the focusing inner tube.

In a possible embodiment of the present application, a maximum included angle between a center line of the focus inner cylinder and a center line of the focus base is θ, where θ is less than 0.1 °.

Or the focusing inner cylinder and the focusing base are coaxially arranged.

In a possible embodiment of the present application, the focusing base is a cylindrical structure with openings at two ends, the lens focusing mechanism further includes a focusing inner cylinder, the focusing inner cylinder is sleeved in the cylindrical structure of the focusing base, and the focusing inner cylinder is in guiding fit with the cylindrical structure of the focusing base; the length range of the focusing inner cylinder and/or the focusing base is 25-35 mm, the inner diameter range of the focusing base is 35-40 mm, and the outer diameter range of the focusing inner cylinder is 35-40 mm;

and/or the focusing base is a barrel structure with openings at two ends, the lens focusing mechanism further comprises a focusing inner barrel, the focusing inner barrel is sleeved in the barrel structure of the focusing base, and the focusing inner barrel is in guiding fit with the barrel structure of the focusing base; the ratio range between the outer diameter and the length of the focusing inner barrel is 1: 2 to 2: 1.

in a possible embodiment of the present application, the axis of the driving shaft of the linear driving assembly, the axis of the focus base and the center line of the detector assembly are all on the same straight line.

In a possible embodiment of the present application, the focusing base is a structure with two open ends, and a fixing portion is disposed on an edge of an open end of the focusing base;

the linear driving assembly is provided with a connecting lug;

the linear driving assembly and the focusing base are fixed through the detachable connection of the connecting lug and the fixing part.

In one possible embodiment of the present application, the linear driving assembly includes:

the linear driving piece is fixed on the focusing base; and

the connecting piece is connected to the driving shaft of the linear driving piece and is connected with the inner peripheral wall of the focusing inner cylinder;

the connecting piece is an adapter plate, the middle part of one side of the adapter plate is connected to the driving shaft of the linear driving piece, and the periphery of the adapter plate is connected to the inner peripheral wall of the focusing inner cylinder.

In a possible embodiment of the present application, a gap eliminating spring is disposed between the linear driving member and the adapter plate;

one end of the gap eliminating spring is abutted to the surface of the adapter plate, and the other end of the gap eliminating spring is connected with the linear driving piece.

In one possible embodiment of the present application, the linear drive assembly further comprises a mounting bracket;

the linear driving piece is installed on the mounting frame, and the mounting frame is connected to the focusing base.

In a possible embodiment of this application, the mounting bracket be formed with the mounting groove and with the hole of dodging of mounting groove intercommunication, linear drive spare install in the mounting groove, its drive shaft passes dodge the hole with the keysets is connected.

In a possible embodiment of the present application, the lens focusing mechanism further includes a distance measuring assembly, and the distance measuring assembly includes:

the fixed seat is mounted on the mounting rack; and

the detection piece is movably arranged in the fixed seat, and the free end of the detection piece is connected to the adapter plate so as to detect the relative displacement between the focusing inner cylinder and the focusing base through the moving position of the detection piece;

the detection piece is a grating ruler, a groove is formed in the free end of the grating ruler, a fixing protrusion is arranged on the surface of the adapter plate, and the fixing protrusion is clamped and fixed in the groove;

and/or, be equipped with the extension spring in the fixing base, the one end of extension spring is connected detect the piece, the other end with the fixing base is connected, the extension spring is in tensile state.

In one possible embodiment of the present application, the detector assembly includes:

the mounting base plate is provided with a fixing hole, a locking piece penetrates through the fixing hole, and a pressure regulating elastic piece is sleeved on the locking piece; and

the detector is mounted on one surface, facing the focusing inner cylinder, of the mounting bottom plate;

one end of the pressure regulating elastic piece, which is far away from the mounting bottom plate, is abutted against the focusing inner cylinder.

In a possible embodiment of this application, the fixed orifices is equipped with three, the retaining member correspondence is equipped with three, wherein two the retaining member cover is equipped with the pressure regulating elastic component, another retaining member lock solid in the focusing inner tube, so that the pressure regulating elastic component is the compression form.

The present application further proposes a camera, the camera comprising:

the lens focusing mechanism is any one of the lens focusing mechanisms, and further comprises a bayonet bracket, wherein the bayonet bracket is connected to the end part of the focusing barrel and sleeved on the detector assembly; and

and the lens is arranged at one end of the bayonet bracket deviating from the focusing base.

The lens focusing mechanism comprises a focusing base, a linear driving assembly arranged on the focusing base and a detector assembly connected to a driving shaft of the linear driving assembly, wherein the detector assembly is driven to move along the optical axis direction by the driving of the linear driving assembly so as to adjust the distance between the detector assembly and a lens, thereby achieving the purpose of focusing. In the structure, the linear driving assembly has high driving force and high driving precision, so that the focusing speed and accuracy can be effectively improved, and the user experience is improved; and the structure can be simplified, the cost is reduced, and the focusing reliability is improved.

Drawings

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

FIG. 1 is a schematic structural diagram of a lens focusing mechanism according to an embodiment of the present invention;

FIG. 2 is an exploded view of the lens focusing mechanism of FIG. 1;

FIG. 3 is an exploded view of a linear drive assembly of the lens focusing mechanism of FIG. 1;

FIG. 4 is an exploded view of a portion of a detector assembly of the lens focusing mechanism of FIG. 1;

FIG. 5 is a schematic structural diagram of a lens focusing mechanism according to another embodiment of the present invention;

FIG. 6 is an exploded view of the lens focusing mechanism shown in FIG. 5;

FIG. 7 is an exploded view of a further embodiment of a lens focusing mechanism of the present invention;

fig. 8 is an exploded view of the lens and bayonet ring of the camera of the present invention.

The reference numbers illustrate:

the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

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 only a part of the embodiments of the present invention, and not all of the embodiments. 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.

It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.

In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In addition, the descriptions related to "first", "second", etc. in the present invention are only for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

Please refer to the drawings, the present application provides a video camera, which may be a digital camera or a single lens reflex camera.

As will be understood from fig. 5 to 8, the camera includes a main body (not shown) and a lens 700 mounted on the main body, and a lens focusing mechanism 100 and a control component are disposed in the main body, so that a better image capturing effect can be obtained.

As an example, the lens focusing mechanism 100 is a part of a host, and is a separate component, which can be assembled into a desired product, and is widely used, so as to achieve a better focusing effect. The lens focusing mechanism 100 comprises a bayonet bracket 60, the lens 700 is mounted on the bayonet bracket 60, and here, a bayonet ring 61 is mounted on the end surface of the bayonet bracket 60, and can be connected with the lens 700 in a matching manner in a screwing manner through threads, and also can be connected with the lens 700 in a matching manner through a buckle manner, so that the lens 700 is convenient to replace and maintain. The lens focusing mechanism 100 includes a focusing base 10, a linear driving assembly 20 and a detector assembly 40, a bayonet bracket 60 is mounted at one end of the focusing base 10 and sleeved on the detector assembly 40, and a lens 700 is arranged opposite to the detector assembly 40, thereby realizing an imaging function. Of course, the camera also includes a housing in which the bayonet mount 60 is mounted, thereby enhancing the aesthetic appearance of the product.

As an example, the lens 700 is configured to be rotatably inserted into the bayonet ring 61 of the bayonet holder 60. And because the lens 700 contains other sensors and moving parts to provide power and control signals, which need to be provided by the snap bracket 60, the surface of the bayonet ring 61 facing the lens 700 is provided with contacts with the required number of signals, and the surface of the lens 700 facing the bayonet ring is also provided with correspondingly required contacts. The snap ring 61 and the lens 700 divide the contact into 2 parts, which are respectively a trigger part and a signal part, that is, the surface of the snap ring 61 is provided with a body trigger part 611 and a body signal part 612, the lens 700 is provided with the lens trigger part and the lens signal part, the body trigger part 611 is an elastic contact pin structure, and the signal on-off is realized through the contact of the elastic contact points.

The contact structure of the lens 700 is characterized in that the contact of the lens triggering part is a 2-core contact, the two contacts are communicated, the two contacts of the body triggering part 611 are powered on one positive electrode and one negative electrode, and the contact of the lens signal part and the contact of the body triggering part are multiple. In the process of rotating the lens 700 after being butted with the lens body, the contact of the signal part is firstly contacted, then the trigger part is contacted, and the signal is communicated, so that the signal part and the trigger part are connected with each other with a certain delay, and when the lens is disassembled, the trigger part is firstly disconnected, so that the signal is disconnected, and then the signal part is disconnected. Of course, the diameter of the flat-top contact of the lens trigger part can be smaller than the contact diameter of the body signal part 612, so as to further increase the time for the trigger part to complete contact with respect to the signal part, thereby improving the safety.

The working process is as follows: after the body trigger part 611 is aligned with the lens trigger part, a power-on signal is triggered; and if the trigger part is communicated to generate a trigger signal, the trigger signal part is electrified. The height difference is arranged between the trigger part and the signal part, and the design is used for preventing the signal part from contacting with the trigger part in the process of inserting and extracting the lens. The charged lens trigger part is not in contact with the lens signal part in the whole process, and the body signal part 612 is also not in contact with the lens trigger part in the whole process, so that the service life of the trigger part is prolonged. Simultaneously be provided with big chamfer guide between the difference in height, promote elastic contact pilotage structural life-span, need not to press all contacts when the installation simultaneously and realize light installation.

The lens focusing mechanism 100 in the camera is a back focus focusing mechanism, and achieves the purpose of focusing by driving the detector assembly 40 to move, and compared with a mode of moving and focusing through a lens in the related art, the structure of the lens 700 can be simplified, the cost of the lens 700 is reduced, and the production efficiency is improved. Meanwhile, the linear driving assembly 20 is used as driving force for driving, so that parts can be effectively reduced, the structure is simplified, and the focusing efficiency and the focusing reliability are improved.

Referring to fig. 1 and fig. 2, the present application further provides a lens focusing mechanism 100, configured to perform back focus focusing on a lens 700, that is, adjust a position of a probe assembly 40, so that a lens can focus on the probe assembly 40.

Referring to fig. 1 to 3, in an embodiment of the present invention, a lens focusing mechanism 100 includes a focusing base 10, a linear driving assembly 20 and a detector assembly 40, wherein the linear driving assembly 20 is fixed to the focusing base 10; the probe assembly 40 is connected with a driving shaft of the linear driving assembly 20; the linear drive assembly 20 drives the detector assembly 40 to move linearly along the optical axis.

In this embodiment, the focus base 10 is a part of the camera body, and can provide necessary support for the linear driving assembly 20, and the shape thereof may be a plate shape, a long cylinder shape, an irregular shape, or the like, which is not limited herein and can provide better support. The linear driving assembly 20 is a component capable of outputting linear driving force, and does not need to be connected with a transmission component capable of changing rotary motion into linear motion, so that the structure can be effectively simplified, and the driving is more direct and stable. Meanwhile, the driving force of the linear driving assembly 20 is larger than that of a general driving mechanism, so that the driving efficiency can be improved. The connection of the linear driving assembly 20 and the focusing barrel may be one of detachable connections, such as a threaded connection or a snap connection, which is not limited herein. The detector assembly 40 may be an infrared detector 42 having an infrared light sensing portion on its surface, referred to as an infrared focal plane array, which converts the optical signal into an electrical signal for output. Of course, the probe assembly 40 may also be other types of probes 42, such as microwave or ultrasonic, for example.

The lens focusing mechanism 100 according to the present invention comprises a focusing base 10, a linear driving assembly 20 mounted on the focusing base 10, and a detector assembly 40 connected to a driving shaft of the linear driving assembly 20, wherein the detector assembly 40 is driven by the linear driving assembly 20 to move along an optical axis direction so as to adjust a distance between the detector assembly 40 and a lens 700, thereby achieving a focusing purpose. In the structure, the linear driving assembly 20 has high driving force and high driving precision, so that the focusing speed and accuracy can be effectively improved, and the user experience is improved; and the structure can be simplified, the cost is reduced, and the focusing reliability is improved.

In a possible embodiment of the present application, the focus base 10 is a cylinder structure with at least one open end, and the linear driving assembly 20 is fixed at the one open end of the focus base 10.

It can be understood that the lens 700 is generally a cylinder, so that, in order to match the bayonet mount 60, in this embodiment, the focusing base 10 is configured as a cylinder structure, and the cross-sectional shape of the cylinder structure may be a circle, a square, a polygon, or the like, and at least one end of the focusing base 10 is open, that is, one end is open, and the other end is a closed surface, or both ends are open structures, which is not limited herein. The linear driving assembly 20 is fixed at an opening at one end of the cylindrical structure of the focusing base 10, and the focusing base 10 of the cylindrical structure can protect the linear driving assembly 20, so that the driving effect of the linear driving assembly is effectively ensured.

In a possible embodiment of the present application, the lens focusing mechanism 100 further includes a focusing inner cylinder 30, the focusing inner cylinder 30 is sleeved in the cylinder structure of the focusing base 10, and an inner wall of the focusing inner cylinder 30 is connected to the driving shaft of the linear driving assembly 20 and the detector assembly 40;

the linear driving assembly 20 drives the focusing inner cylinder 30 to move linearly in the focusing base 10 along the optical axis direction, and drives the detector assembly 40 to move linearly together.

In the present embodiment, in order to further improve the driving stability of the linear driving assembly 20, a focusing inner cylinder 30 is disposed in the focusing base 10, and the focusing inner cylinder 30 moves in the optical axis direction in the focusing base 10 as an intermediate connecting member, so as to provide a certain guiding function for the focusing linear motion, and prevent the driving shaft of the linear driving assembly 20 from deviating from the optical axis direction, thereby further improving the focusing reliability.

The connection manner of the focus inner cylinder 30 and the driving shaft of the linear driving assembly 20 may be a threaded connection, a snap connection, or the like, and the connection manner of the focus inner cylinder 30 and the detector assembly 40 may be a threaded connection, a snap connection, or the like, which is not limited herein.

Referring to fig. 2, in a possible embodiment of the present application, a limiting hole 12 is formed in a peripheral wall of the focusing base 10, and the limiting hole 12 extends along the optical axis direction;

the peripheral wall of the focusing inner cylinder 30 is connected with a limiting member 31, and the limiting member 31 is limited to move along the optical axis direction in the limiting hole 12 to limit the focusing inner cylinder 30 to rotate circumferentially.

In this embodiment, in order to further ensure the linear motion of the focusing inner cylinder 30, a limiting member 31 is connected to the outer peripheral wall of the focusing inner cylinder, the limiting member 31 may be a screw or a bump, a limiting hole 12 is formed in the peripheral wall of the focusing base 10, the limiting hole 12 extends in the axial direction of the focusing base 10, the extending length is greater than the length of the limiting member 31, and the width in the circumferential direction is matched with the limiting member 31, so that the limiting member 31 linearly moves in the limiting hole 12, the movement in the optical axis direction is ensured, and the circumferential rotational motion is avoided, thereby further improving the guiding effect, and ensuring the reliability of the movement of the driving detector assembly 40.

As an example, a threaded hole is formed in a peripheral wall of the focus inner cylinder 30, and the stopper 31 is fixed to the focus inner cylinder 30 by a screw inserted into the threaded hole. The shape of the position-limiting member 31 may be waist-shaped, and the shape of the position-limiting hole 12 matches with it.

In one possible embodiment of the present application, a maximum included angle between a central line of the focus inner cylinder 30 and a central line of the focus base 10 is set to be θ, where θ is smaller than 0.1 °.

In this embodiment, in order to ensure the guiding effect, the difference between the diameter of the focusing inner cylinder 30 and the diameter of the focusing base 10 should not be too large, and the lengths of the two in the axial direction also need to be ensured within a certain range. Here, the center line of the focus inner cylinder 30 and the center line of the focus base 10 may be on the same straight line or may not be on one jump straight line. In order to ensure that the focusing inner cylinder 30 does not generate friction obstruction in the cylinder structure of the focusing base 10, θ is set to be smaller than 0.1 °, and the focusing inner cylinder 30 and the focusing base 10 are ensured to be arranged in parallel as far as possible, so that the focusing inner cylinder 30 moves more smoothly in the focusing base 10, and the focusing movement in the optical axis direction is ensured to be more reliable.

As an example, θ can be used as a reference for designing the diameters of the focus inner cylinder 30 and the focus base 10, so as to adjust accordingly according to actual requirements, and the calculation formula is: θ ═ α 2- α 1 ═ arcsin (D/a) -arcsin (D/a), a √ D²+L²Wherein D is the diameter of the focusing base 10, D is the diameter of the focusing inner cylinder 30, and L is the matching length of the lens 700.

In one possible embodiment of the present application, the focus inner cylinder 30 is disposed coaxially with the focus base 10.

In this embodiment, in order to further promote the guide effect, with focusing inner tube 30 and focusing base 10 coaxial setting, the contained angle that also means central line between them is 0, and coincide mutually to guarantee clearance between the two and locate evenly distributed at each position, focusing inner tube 30's removal is more smooth and easy, and can in time adjust inclination between them, thereby guarantee the focusing reliability.

As an example, the focus base 10 is cylindrical, and the focus inner cylinder 30 is also cylindrical, so that the sharp surface can be effectively reduced, and the smoothness of the guiding movement can be further improved. In order to save space, illustratively, the linear driving assembly 20 is partially arranged in the focusing inner cylinder 30, so that the length of the focusing inner cylinder 30 matched with the focusing outer cylinder is increased, no extra space is occupied, the stability of the whole structure is effectively ensured, and the miniaturization is facilitated.

As an example, the focus base 10 is a cylindrical structure with openings at two ends, the lens focusing mechanism 100 further includes a focusing inner cylinder 30, the focusing inner cylinder 30 is sleeved in the cylindrical structure of the focus base 10, the focusing inner cylinder 30 is in guiding fit with the cylindrical structure of the focus base 10, the length range of the focusing inner cylinder 30 and/or the focus base 10 is 25mm to 35mm, the inner diameter range of the focus base 10 is 35mm to 40mm, and the outer diameter range of the focusing inner cylinder 30 is 35mm to 40 mm.

Here, the focus base 10 is set to be a cylindrical structure with openings at both ends, the focus inner cylinder 30 moves in the cylindrical structure, and the two are in guiding fit, that is, the focus base 10 regulates the movement of the focus inner cylinder 30 as a kind of guiding structure, and the focus inner cylinder 30 moves within a certain range along the inner wall surface of the focus base 10, so that the two keep high coaxiality movement, and excessive deviation in the moving process is prevented from occurring, which affects the accuracy. And the two are used as a cylinder structure, and the length of the two in the axial direction also needs to be ensured within a certain range. Therefore, as an example, the lengths of the focus adjustment inner cylinder 30 and the focus base 10 are set to be substantially the same, and both are in the range of 25mm to 35mm, for example, the lengths of the focus base 10 and the focus adjustment inner cylinder 30 are 28.8 mm. The inner diameter of the focus base 10 is set to be in a range of 35mm to 40mm, for example, 38.5mm, in order to ensure the guiding effect, the diameter of the focus inner cylinder 30 should not be too different from the diameter of the focus base 10, as an example, the inner diameter of the focus inner cylinder 30 may be adapted to the outer diameter of the focus base 10, and the two are only distinguished by a tolerance, and as an example, the outer diameter of the focus inner cylinder 30 is set to be 35mm to 40mm

The inner diameter of the focusing base 10 is

Better guide effect can be obtained, and driving precision and efficiency are improved. Of course, the dimensions of the focus base 10 and the focus inner cylinder 30 according to the present invention are not limited to the above values, and are designed according to specific performance requirements.

And/or, the focusing base 10 is a barrel structure with openings at two ends, the lens focusing mechanism 100 further comprises a focusing inner barrel 30, the focusing inner barrel 30 is sleeved in the barrel structure of the focusing base 10, the focusing inner barrel 30 is in guide fit with the barrel structure of the focusing base 10, and in order to further improve the moving coaxiality of the focusing inner barrel 30, the ratio range between the outer diameter and the length of the focusing inner barrel 30 is 1: 2-2: 1.

here, the focus base 10 is set to be a cylindrical structure with openings at both ends, the focus inner cylinder 30 moves in the cylindrical structure, and the two are in guiding fit, that is, the focus base 10 regulates the movement of the focus inner cylinder 30 as a kind of guiding structure, and the focus inner cylinder 30 moves within a certain range along the inner wall surface of the focus base 10, so that the two keep high coaxiality movement, and excessive deviation in the moving process is prevented from occurring, which affects the accuracy. On the basis of the length and inner diameter size ranges of the focus inner cylinder 30 and/or the focus base 10, the ratio of the outer diameter to the length of the focus inner cylinder 30 can be set, for example, the ratio of the outer diameter to the length of the focus inner cylinder 30 is 1: 2. 2: 3. 1: 1. 7: 5. 8: 5 or 2: 1, so, focusing inner tube 30 is when moving for focus base 10, and the axial inclination is less relatively to further guarantee that the axiality is higher, promote focusing effect.

Alternatively, in a configuration where the length and inner diameter dimensions of focus inner barrel 30 and/or focus base 10 are not limited, the ratio of the outer diameter to the length of focus inner barrel 30 is limited to 1: 2-2: 1, also can guarantee the guide effect of focusing base to the focusing inner tube, promote the axiality.

In one possible embodiment of the present application, the axes of the driving shafts of the linear driving assembly 20, the axis of the focus base 10 and the center line of the detector assembly 40 are all on a straight line.

The drive shaft of linear drive subassembly 20 is located its middle part position, in this embodiment, when the axis of the drive shaft of linear drive subassembly 20, the axis of focusing base 10 and detector subassembly 40's central line three when on a straight line, it is more steady during linear drive, can further guarantee that the drive of linear drive subassembly 20 removes along the optical axis direction, the skew condition does not take place, detector subassembly 40's smoothness also can be guaranteed to the while, make it keep with optical axis looks vertically state, and then can promote the effect of making a video recording.

Referring to fig. 2 and fig. 3, in a possible embodiment of the present application, the focusing base 10 is a structure with two open ends, and a fixing portion 11 is disposed on an edge of one open end;

the linear driving assembly 20 is provided with a connecting lug 243;

the linear driving assembly 20 and the focus base 10 are fixed by the detachable connection of the engaging lug 243 and the fixing portion 11.

In this embodiment, for the convenience of detachment, the linear driving assembly 20 and the focus base 10 are detachably fixed. As an example, the focus base 10 is of a structure with two open ends, the fixing portion 11 is disposed at an open edge of one end, and the linear driving assembly 20 is provided with the connecting lug 243, so that the linear driving assembly 20 can be conveniently fixed at one end of the focus base 10, and the driving shaft of the linear driving assembly 20 can be conveniently connected with the detector assembly 40 through the other end thereof. In the embodiment with the focusing inner cylinder 30, the openings at both ends can also facilitate the movement of the focusing inner cylinder 30, thereby realizing the guiding function.

As an example, the engaging lug 243 is provided with a hole, the fixing portion 11 is provided with a corresponding hole, and the holes are sequentially formed through the fixing member and the engaging lug, thereby realizing a screw connection. This connected mode is stable and convenient dismantlement, can effectively guarantee linear drive assembly 20's stability.

Referring to fig. 3, in one possible embodiment of the present application, the linear driving assembly 20 includes:

the linear driving piece 21, the said linear driving piece 21 is fixed to the said focusing base 10; and

a coupling member coupled to a driving shaft of the linear driving member 21 and coupled to an inner circumferential wall of the focus inner cylinder 30;

the connecting piece is an adapter plate 22, the middle part of one side of the adapter plate 22 is connected to the driving shaft of the linear driving piece 21, and the periphery of the adapter plate 22 is connected to the inner peripheral wall of the focusing inner cylinder 30.

In this embodiment, the linear driving assembly 20 includes a linear driving member 21, and the linear driving member 21 is a main driving component, and a driving shaft is disposed in the middle of the linear driving member 21, so as to implement linear driving. As an example, the linear driving member 21 may be a through-type screw rod stepping motor or a fixed-shaft type screw rod stepping motor, in which the driving shaft of the through-type screw rod stepping motor penetrates through the entire component and performs linear motion in cooperation with the internal component, and both of the through-type screw rod stepping motor and the fixed-shaft type screw rod stepping motor have good driving force and long service life, and can also meet the requirement for driving precision.

In order to facilitate the connection of the linear driving member 21 to the focusing inner cylinder 30, a connecting member is further provided, which serves as an intermediate member and can be connected to both the driving shaft of the linear driving member 21 and the inner peripheral wall of the focusing inner cylinder 30, and the connecting member can be in a strip shape, a plate shape or an irregular shape as long as it can function as a bridge for intermediate connection, thereby achieving the stability of connection.

As an example, the connecting member is an adapter plate 22, the adapter plate 22 is in a plate shape, the middle part of the adapter plate 22 is connected to the driving shaft of the linear driving member 21, and the adapter plate and the driving shaft can be connected through threads, so that the assembly is simple and convenient, and the assembly efficiency is improved. Of course, a plug or other connection may be selected. The periphery of the adapter plate 22 is connected with the inner peripheral wall of the focusing inner cylinder 30, so that the middle of the adapter plate is connected with the driving shaft, the linear driving piece 21 drives the center of the focusing inner cylinder 30 all the time, the center of the linear driving piece corresponds to the center of the detector assembly 40, the consistency of the driving force of the lens focusing mechanism 100 is effectively guaranteed, the deviation of the driving direction is further reduced, and the focusing efficiency and reliability are improved.

Illustratively, the adapter plate 22 has two parallel straight edges and two opposite arc-shaped edges which are arranged oppositely, the two straight edges are matched with the edge of the linear driving member 21, and the two arc-shaped edges are matched with the peripheral wall of the focusing inner cylinder 30, so that the fixing is convenient, the use of materials is reduced, the overall weight of the lens focusing mechanism 100 is favorably reduced, and the camera is lighter. As an example, the adapter plate 22 is screwed to the focusing inner cylinder 30 to ensure the stability of the connection.

In a possible embodiment of the present application, a gap eliminating spring 23 is disposed between the linear driving member 21 and the adaptor plate 22;

one end of the gap eliminating spring 23 abuts against the surface of the adapter plate 22, and the other end is connected with the linear driving piece 21.

In this embodiment, in order to ensure the driving force of the linear driving member 21, a gap eliminating spring 23 is provided between the adaptor plate 22 and the linear driving member 21, the gap eliminating spring is fixed to at least one of the adaptor plate 22 and the linear driving member 21, so as to keep the position of the gap eliminating spring 23 stable, the gap eliminating spring 23 is in a pressed state, so that the adaptor plate 22 and the driving shaft tend to be abutted, the gap between the adaptor plate and the driving shaft is eliminated, the consumption of the driving force of the linear driving member 21 is reduced, the return stroke difference is reduced, and the reliability of the focusing movement is further improved. Illustratively, the anti-backlash spring 23 has a larger inner diameter than the setting and is connected to the end face of the linear drive 21 through the drive shaft, thereby reducing the influence on the drive shaft.

Referring to fig. 3, in one possible embodiment of the present application, the linear driving assembly 20 further includes a mounting bracket 24;

the linear driving member 21 is mounted on the mounting bracket 24, and the mounting bracket 24 is connected to the focus base 10.

In this embodiment, in order to strengthen the installation stability of linear driving piece 21, linear driving assembly 20 still is equipped with mounting bracket 24, installs linear driving piece 21 in focusing base 10 through mounting bracket 24, can be through the area of contact and the connection site of design mounting bracket 24 with focusing base 10, need not to reform transform to linear driving piece 21 to effectively promote connection stability, guarantee the drive effect. Illustratively, the mounting bracket 24 may be planar plate-shaped, irregular-shaped, or the like. And the mounting bracket 24 may be located between the linear driver 21 and the adapter plate 22, or may be located on a side of the linear driver 21 facing away from the adapter plate 22.

In a possible embodiment of the present application, the mounting bracket 24 is formed with a mounting groove 241 and an avoiding hole 242 communicating with the mounting groove 241, the linear driving element 21 is installed in the mounting groove 241, and the driving shaft thereof passes through the avoiding hole 242 and the adapter plate 22.

In this embodiment, the mounting frame 24 is formed with a mounting groove 241 and an avoiding hole 242, that is, between the linear driving element 21 and the adaptor plate 22, the linear driving element 21 is mounted in the mounting groove 241, the driving shaft faces a groove wall, and the groove wall is provided with the avoiding hole 242, so that the driving shaft is connected with the adaptor plate 22. The opening of the clearance hole 242 is sized to fit the diameter of the drive shaft, or is larger than the diameter of the drive shaft, to reduce interference effects. When the anti-backlash spring 23 is disposed, the opening of the avoiding hole 242 may be larger than the outer diameter of the anti-backlash spring 23, so as to facilitate connection with the linear driving member 21. Illustratively, the mounting bracket 24 is U-shaped, and its material can be plastics, through mould integrated into one piece, and processing is convenient and structural stability is good. Alternatively, the mounting bracket 24 is made of metal, which facilitates heat dissipation of the linear actuator 21. The bottom wall of the mounting groove 241 is provided with a relief hole 242, and the two side walls of the mounting groove 241 coat the circumferential surface of the linear driving element 21, so that a stable mounting structure is formed, and the structural stability of the whole body is improved; the other two opposite sides of the mounting frame 24 are provided with openings, so that the heat dissipation of the linear driving member 21 can be facilitated, and the heat dissipation capability is further improved.

As an example, the above-mentioned engaging lug 243 is disposed on the mounting frame 24, and is perpendicular to the axis of the avoiding hole 242, the opening edge of the focusing base 10 is provided with the fixing portion 11, and the surface of the fixing portion 11 is flush with the end surface of the focusing base 10, so as to improve the structural stability of the focusing base, facilitate the processing and the assembling, and simultaneously reduce the occupation of the space in the focusing base 10, so that the matching effect of the focusing base 10 and the focusing inner barrel 30 is better. Illustratively, the fixing portions 11 are screwed to the engaging lugs 243, and four fixing portions 11 are disposed at the opening edge of the focus base 10, and the four engaging lugs 243 are distributed on two side walls of the mounting groove 241, so as to further improve the mounting stability.

Referring to fig. 3, in one possible embodiment of the present application, the lens focusing mechanism 100 further includes a distance measuring assembly 50, where the distance measuring assembly 50 includes:

a fixed seat 51 and a detection piece 52, wherein the fixed seat 51 is mounted on the mounting frame 24;

the detecting element 52 is movably disposed in the fixing seat 51, and a free end of the detecting element 52 is connected to the adapting plate 22, so as to detect the relative displacement between the focusing inner cylinder 30 and the focusing base 10 through the moving position of the detecting element 52.

The purpose of focusing is achieved through linear driving of the detector 42, in order to improve the success rate of focusing in the actual operation and use process, in this embodiment, a distance measuring assembly 50 is further provided, and the distance measuring assembly 50 detects the relative displacement between the focusing inner cylinder 30 and the focusing base 10 to obtain corresponding focusing feedback, so that full closed-loop focusing is achieved, and the focusing reliability is further ensured. When the linear driving piece 21 has an accident condition such as step-out, the position of the detector assembly 40 can be found in time and is not moved, so that the result is fed back, the driving force is provided again, successful focusing is ensured, or the operation such as maintenance is found in time, and the use performance of the camera is improved.

Illustratively, the distance measuring assembly 50 includes a fixing base 51 and a detecting member 52, wherein the fixing base 51 is used for fixing the detecting member 52, and provides a certain supporting and protecting function. For the convenience of detection, the fixing seat 51 is arranged on the mounting frame 24, one end of the detection piece 52 is connected to the adapter plate 22, and the moving positions of the focusing inner cylinder 30 and the detector assembly 40 are judged by removing the moving position of the adapter plate 22.

As an example, the distance measuring assembly 50 may be a photoelectric encoder, and a laser distance measuring device may also be disposed on the main body of the camera, so as to obtain real-time position information of the linear driving element through the photoelectric encoder, and avoid the problems of step loss and return difference of the linear driving element. The physical position of the measured part is detected through the laser ranging device, and the real-time distance of the measured object is obtained.

Therefore, the camera uses the laser ranging device to test the distance of the measured object, after the distance information of the object is obtained, the main platform in the camera calls the data information calibrated in advance, the focus point is not required to be searched by running in the full stroke, and the focus point can be directly found according to the calibration information and the position information of the photoelectric encoder. Meanwhile, an image AF focusing component can be arranged in the camera, and if the laser ranging device measures deviation, the image AF value of the image AF focusing component can be synchronously called to make up for the defect of laser ranging deviation.

By combining the laser ranging device and the photoelectric encoder, the following effects can be realized: 1. the external distance acquisition is matched with the internal real-time distance information, so that focusing can be quickly realized; 2. an ABF (auto Back focus) focusing mode is used, and the focusing stroke is shortened and the focusing time is further shortened by adjusting the form of the Back focus; 3. the full feedback focusing is matched with a traditional image AF focusing mode to realize complementation, the laser ranging focusing is used by default, and when the laser ranging is deviated, the focusing efficiency is further accelerated through the image AF focusing compensation.

Referring to fig. 3, in one possible embodiment of the present application, the detecting element 52 is a grating ruler, a groove 521 is formed at a free end of the grating ruler, a fixing protrusion 25 is disposed on a surface of the adapter plate 22, and the fixing protrusion 25 is clamped in the groove 521;

and/or, a tension spring is arranged in the fixed seat 51, one end of the tension spring is connected with the detection piece 52, the other end of the tension spring is connected with the fixed seat 51, and the tension spring is in a stretching state.

In this embodiment, the detection element 52 is selected as a grating ruler, and of course, a light source, an indication grating and a photoelectric element are further disposed in the fixing base 51, and the moire fringe number corresponding to the moire fringe number is obtained through the relative movement between the two gratings, so as to obtain the actual movement displacement of the detector assembly 40. In order to reduce the occupation of space, the fixing seat 51 is installed on the two opposite sides of the mounting frame 24, which are one side in the opening, meanwhile, the adapter plate 22 matched with the inner wall of the focusing inner cylinder 30 is in a cuboid shape, and the fixing protrusions 25 are arranged in the length direction of the adapter plate, so that the existing structure of the adapter plate 22 can be utilized for installation, no extra space is occupied, and the structural stability is further improved.

Illustratively, the end of the detecting member 52 is provided with a groove 521, a screw is mounted on the fixing protrusion 25, and the groove 521 and the screw are engaged with each other, so as to achieve a more stable engaging effect.

On the basis that detects 52 for grating chi, be equipped with the extension spring in fixing base 51, it is to grating chi's pulling force to be had when the extension spring is in tensile pile body to make grating chi's tip remain throughout and fixed protruding 25 between the contact connection, effectively reduce the clearance, thereby promote the degree of accuracy and the efficiency that detect.

The detecting member 52 may also be a magnetic grid, i.e., a hall sensor, etc., for example.

Referring to fig. 4, in one possible embodiment of the present application, the detector assembly 40 includes:

the device comprises a mounting bottom plate 41, wherein the mounting bottom plate 41 is provided with a fixing hole 411, a locking part 43 and a detector 42 penetrate through the fixing hole 411, and the locking part 43 is sleeved with a pressure regulating elastic part 45;

the detector 42 is mounted on a surface of the mounting base plate 41 facing the focusing inner cylinder 30;

one end of the pressure regulating elastic member 45, which is far away from the mounting base plate 41, abuts against the focusing inner cylinder 30.

In this embodiment, the mounting base plate 41 is used to mount the detector 42, and components such as a control circuit can be provided inside, and the mounting base plate 41 and the focusing inner tube 30 are connected by a screw connection, which provides a good structural stability. In order to prevent the camera effect from being affected by the installation error of the detector assembly 40, the detector assembly 40 is provided with a pressure regulating elastic part 45, and the pressure regulating elastic part 45 can be a spring, an elastic tube or the like and has good elasticity. This pressure regulating elastic component 45 is the pressurized state all the time to can control the pressurized length of elastic component through adjusting retaining member 43, come leveling detector 42 with this, make it keep perpendicular mutually with the optical axis, thereby obtain better formation of image effect, prevent the bad phenomenon that half is pasted.

Referring to fig. 4, in a possible embodiment of the present application, there are three fixing holes 411, and there are three corresponding locking members 43, wherein two of the locking members 43 are sleeved with the pressure-adjusting elastic member 45, and the other locking member 43 is locked to the focusing inner tube 30, so that the pressure-adjusting elastic member 45 is compressed.

In this embodiment, in order to realize better regulation effect, and conveniently adjust, it has threely to set for fixed orifices 411, retaining member 43 also is provided with threely, set up with fixed orifices 411 one-to-one respectively, the cover is equipped with pressure regulating elastic component 45 on two retaining members 43, and another direct lock solid is to focusing inner tube 30 on, the retaining member 43 that sets up pressure regulating elastic component 45 highly will be higher than the retaining member 43 that does not set up pressure regulating elastic component 45, guarantee detector assembly 40's position accuracy, the retaining member 43 that is equipped with pressure regulating elastic component 45 separates certain distance setting. As an example, the surface of the mounting base plate 41 is taken as a plane, an X-Y coordinate system is established on the plane, the locking member 43 without the pressure regulating elastic member 45 is taken as an origin, so that one pressure regulating elastic member 45 is arranged in the X-axis direction, and the other pressure regulating elastic member 45 is located in the Y-axis direction, thereby obtaining a good regulating effect, improving the imaging effect of the detector assembly 40, and ensuring the shooting performance of the camera.

As an example, two positioning columns 44 are further disposed on the mounting base plate 41, and two positioning columns 44 are disposed, and a positioning hole is correspondingly disposed on the focusing inner cylinder 30, so as to achieve positioning and mounting of the two. Two positioning columns 44 are respectively located at two opposite sides of the mounting base plate 41, and when the focusing assembly of the lens 700 is in a horizontal state, the two positioning columns 44 are respectively located at the left and right directions of a user, so that the mounting accuracy of the detector assembly 40 in the left and right directions is ensured, the condition of image dark corners is prevented, and the shooting performance is improved.

The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the technical solutions of the present invention, which are made by using the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. A lens focusing mechanism, characterized by comprising:

a focusing base;

the linear driving assembly is fixed on the focusing base; and

a probe assembly connected to a drive shaft of the linear drive assembly;

the linear driving assembly drives the detector assembly to move linearly along the optical axis direction.

2. The lens focusing mechanism of claim 1, wherein the focus mount is a barrel structure having at least one end open, and the linear drive assembly is fixed to the focus mount at the one end open.

3. The lens focusing mechanism of claim 2, further comprising a focusing inner barrel, wherein the focusing inner barrel is internally sleeved in the barrel structure of the focusing base, and an inner wall of the focusing inner barrel is connected with the driving shaft of the linear driving assembly and the detector assembly;

4. A lens focusing mechanism according to claim 3, wherein a peripheral wall of the focusing base is provided with a stopper hole, the stopper hole extending in the optical axis direction;

5. The lens focusing mechanism of claim 3, wherein the maximum angle between the center line of the focusing inner cylinder and the center line of the focusing base is θ, wherein θ is smaller than 0.1 °;

or the focusing inner cylinder and the focusing base are coaxially arranged.

6. The lens focusing mechanism according to claim 1, wherein the focus mount is a barrel structure with openings at both ends, the lens focusing mechanism further comprising a focus inner barrel, the focus inner barrel being nested within the barrel structure of the focus mount, the focus inner barrel being in guiding engagement with the barrel structure of the focus mount; the length range of the focusing inner cylinder and/or the focusing base is 25-35 mm, the inner diameter range of the focusing base is 35-40 mm, and the outer diameter range of the focusing inner cylinder is 35-40 mm;

and/or the focusing base is a barrel structure with openings at two ends, the lens focusing mechanism further comprises a focusing inner barrel, the focusing inner barrel is sleeved in the barrel structure of the focusing base, and the focusing inner barrel is in guiding fit with the barrel structure of the focusing base; the range of the ratio between the outer diameter and the length of the focusing inner barrel is 1: 2 to 2: 1.

7. the lens focusing mechanism of claim 2, wherein the axis of the drive shaft of the linear drive assembly, the axis of the focus mount, and the centerline of the detector assembly are all aligned.

8. The lens focusing mechanism according to claim 2, wherein the focusing base has a structure with two open ends, wherein a fixing portion is provided at an edge of the open end;

the linear driving assembly is provided with a connecting lug;

9. A lens focusing mechanism according to claim 3, wherein the linear drive assembly comprises:

the linear driving piece is fixed on the focusing base; and

the connecting piece is an adapter plate, the middle of the adapter plate is connected to the driving shaft of the linear driving piece, and the periphery of the adapter plate is connected to the inner peripheral wall of the focusing inner cylinder.

10. A lens focusing mechanism according to claim 9, wherein a backlash eliminating spring is provided between the linear actuator and the adapter plate;

11. The lens focusing mechanism of claim 9, wherein the linear drive assembly further comprises a mounting bracket;

12. The lens focusing mechanism according to claim 11, wherein the mounting bracket is formed with a mounting groove and an avoiding hole communicating with the mounting groove, the linear driving member is mounted in the mounting groove, and a driving shaft thereof passes through the avoiding hole to be connected with the adapter plate.

13. A lens focusing mechanism according to claim 11 or 12, further comprising a distance measuring assembly, the distance measuring assembly comprising:

the fixed seat is mounted on the mounting rack; and

14. A lens focusing mechanism according to any one of claims 3 to 12, wherein the detector assembly comprises:

15. A lens focusing mechanism according to claim 14, wherein there are three fixing holes and three corresponding locking members, two of the locking members are provided with the pressure adjusting elastic member, and the other locking member is locked to the focusing inner tube, so that the pressure adjusting elastic member is compressed.

16. A camera, characterized in that the camera comprises:

the lens focusing mechanism according to any one of claims 1 to 15, further comprising a bayonet mount connected to the focusing base and sleeved on the detector assembly; and