CN111566555B

CN111566555B - Shutter device and image pickup apparatus

Info

Publication number: CN111566555B
Application number: CN201980007766.3A
Authority: CN
Inventors: 王雨浓
Original assignee: SZ DJI Technology Co Ltd
Current assignee: SZ DJI Technology Co Ltd
Priority date: 2019-05-30
Filing date: 2019-05-30
Publication date: 2021-09-21
Anticipated expiration: 2039-05-30
Also published as: CN111566555A; WO2020237578A1

Abstract

A shutter device and photographic device, the shutter device includes the base (10), the cam ring (20), the shutter blade (30), elastic component and drive unit (50), there are unthreaded holes (12) on the base (10); the cam ring (20) is arranged on the base (10) and comprises a ring body (22) and cams (24) connected with the inner wall of the ring body (22), and each cam (24) comprises at least two sections with different height change laws; the shutter blade (30) is rotatably connected with the base (10) and is abutted with the cam (24); the elastic member is connected between the base (10) and the shutter blade (30); in the process that the driving device (50) drives the cam ring (20) to rotate, all the shutter blades (30) cover or avoid the unthreaded hole (12) under the combined action of the pushing force of the cam (24) and the pulling force of the elastic piece, and the shutter device can meet the requirement of quick response and is small in size.

Description

Shutter device and image pickup apparatus

Technical Field

The present disclosure relates to the field of optical imaging, and more particularly, to a shutter device and a photographing apparatus.

Background

With the improvement of living standard, the requirement of selecting to record through the camera lens is more and more, and therefore, higher requirements are put on the function and performance of the lens. Especially in the rapid development of optics, the performance of the shutter in the lens or camera needs to be improved more to meet the use requirements of users. Meanwhile, the demand for using the inter-mirror shutter is more and more strong, which requires that the inter-mirror shutter can meet the requirement of fast response and needs to be made smaller in size.

At present, the volume of the inter-lens shutters adopted in the single lens reflex is large, and the driving speed is difficult to meet the use requirement due to the limitation of the shutter structure.

Disclosure of Invention

The present application is directed to solving at least one of the problems of the prior art or the related art.

To this end, one aspect of the present application proposes a shutter device.

Another aspect of the present application is directed to a photographing apparatus.

In view of the above, according to one aspect of the present application, there is provided a shutter device, including a base, a cam ring, shutter blades, an elastic member, and a driving device, wherein the base is provided with an aperture; the cam ring is arranged on the base and comprises a ring body and cams connected with the inner wall of the ring body, all the cams are distributed along the circumferential direction of the ring body, each cam comprises at least two sections, the height of the cam protruding from the inner wall of the ring body to the center of the ring body is taken as the height of the cam, and the height change rules of the cams at different sections are different; the shutter blades are rotatably connected with the base, the rotating axes of the shutter blades are parallel to the axis of the ring body, the number of the shutter blades is equal to that of the cams, and the shutter blades are abutted against the cams; the elastic piece is connected between the base and the shutter blade; the driving device is used for driving the cam ring to rotate relative to the base, and all the shutter blades cover the light holes or avoid the light holes under the combined action of the pushing force of the cam and the pulling force of the elastic piece in the rotating process of the cam ring.

The shutter device that this application embodiment provided, can satisfy the functional requirement of quick response, and small in size is again, and through setting up cam ring and elastic component, the cam ring rotates for the base under drive arrangement's effect, and cam and shutter blade looks butt can promote shutter blade to rotate along with the rising of cam height, and shutter blade then elongates the elastic component at the rotation in-process for the elastic component possesses the pulling force that resets (elastic restoring force promptly) with shutter blade pull back home position, thereby makes shutter blade sticis the cam ring. The shutter device can control the shutter blades to rotate towards the unthreaded hole or rotate away from the unthreaded hole by means of the pushing force of the cam and the pulling force of the elastic piece, and then the shutter blades open and close the unthreaded hole, namely the shutter is opened and closed. Specifically, when the shutter is closed, all the shutter blades are rotated to collectively cover the aperture, rather than a single shutter blade covering the entire aperture, the amount and size of rotation of each shutter blade can be reduced. The shutter device has small volume and small requirement on installation space, and can meet the volume requirement of the shutter between the mirrors. In addition, in the aspect of driving, only the driving device is needed to drive the cam ring to rotate, the method is easy to realize and high in reliability, and the functional requirements are met.

In addition, according to the shutter device in the above technical solution provided by the present application, the following additional technical features may also be provided:

in the above technical solution, preferably, the shutter device further includes a vane rotating shaft provided on the base and located outside the cam ring; the shutter blade comprises a blade body and a convex part, and the blade body is rotatably connected with the blade rotating shaft; the convex part is arranged on the vane body and positioned on the inner side of the cam ring, the convex part can be in contact with the cam, and the elastic part is elongated in the process that the cam pushes the convex part to move towards the center direction of the cam ring.

In the technical scheme, the connection relation between the shutter blade and the base and the matching relation between the shutter blade, the cam and the elastic piece are specifically limited. The shutter blade is rotatably connected with the base through the blade rotating shaft, so that the rotating axis of the shutter blade is positioned outside the cam ring, and the blade body can rotate in the cam ring to realize the opening and closing of the shutter. The cam is matched with the boss, the boss and the cam are located on the same horizontal plane, the blade body can be located on a horizontal plane different from the cam, the cam does not need to directly push the blade body, reasonable matching points (namely the positions of the bosses) can be set according to needs, and the peripheral structure of the blade body is simple. In addition, in the process that the cam pushes the boss to move towards the center direction of the cam ring, the blade body can rotate along the corresponding direction, at the moment, the elastic part only needs to be stretched, the shutter blade can be pulled back by using elastic restoring force after the cam pushes the boss to the highest point, so that the rotation in the other direction is realized, and the pushing force of the cam and the pulling force of the elastic part can both normally act to realize the opening and closing of the shutter.

In any of the above solutions, preferably, the elastic member is connected to the boss.

In the technical scheme, the existing bulge part is directly connected with the elastic part, so that other connecting structures are not required to be arranged on the blade body, and the structural strength of the bowl-breaking blade body caused by the fact that the elastic part is directly connected with the blade body is not required, the structure is simplified, and the product reliability is improved.

In any of the above technical solutions, preferably, the blade body includes a driving blade and a switching blade, the driving blade is rotatably connected to the blade rotating shaft, the protrusion is disposed on the driving blade, and the driving blade avoids the unthreaded hole; the shutter blade is connected to the driving blade, and the shutter blade blocks a partial area of the aperture when the shutter blade is in the first position covering the aperture.

In this technical scheme, divide into transmission blade and switch blade with the blade body to set up the bellying on the transmission blade that is close to the blade axis of rotation, can reduce the radius of rotation of bellying, and the corresponding bellied height of cam towards ring body center that reduces. On one hand, the structure is simplified, the weight of the product is reduced, and materials are saved; on the other hand, the cam is far away from the switch blade, so that the cam cannot extend into the light hole to shield the light hole, and the normal operation of the shutter is ensured. It will be appreciated that the driving blade and the switch blade are integrally formed as a single unit, and are herein divided into regions for the purpose of distinguishing between different functions.

In any of the above aspects, preferably, when the shutter blade is at the first position, the blade body extends from the end connected to the blade rotation shaft toward the direction opposite to the rotation direction of the cam ring, and then bends and extends toward the center of the cam ring, the part of the blade body before bending is the transmission blade, and the part of the blade body after bending is the opening/closing blade; all the cams are evenly distributed along the circumferential direction of the ring body at intervals, in the rotating process of the cam ring, the cams push the shutter blades to rotate from a first position to a second position avoiding the unthreaded hole, and the elastic pieces pull the shutter blades to rotate from the second position to the first position.

In the technical scheme, when the shutter blades are at the first position, the transmission blades extend from one end connected with the blade rotating shaft to the direction opposite to the rotating direction of the cam ring, the switch blades extend to the center direction of the cam ring to shield partial area of the light hole, and all the switch blades cover the light hole together. Along with the rotation of the cam ring, the cam pushes the protruding part to move towards the center direction of the cam ring, the transmission blade rotates along with the cam, the switch blade is driven to be far away from the center of the cam ring, and the elastic part is stretched at the same time. When the shutter blade rotates to the second position, the boss moves to the highest point of the cam, and the switch blade completely moves out of the light hole, so that the shutter is opened. After that, the cam ring continues to rotate, the cam can not push the lug boss to keep at the second position any more along with the descending of the height of the cam, the shutter blade rotates towards the first position under the action of the pulling force of the elastic piece, the switch blade moves towards the center of the cam ring, and when the switch blade reaches the first position, the optical hole is completely covered, the closing of the shutter is realized, and the periodic action of moving the shutter blade from closing to opening and then moving to closing is completed. After that, the convex part of the shutter blade is in the interval area between two adjacent cams, the interval area can be understood as circular arc with equal radius, so that the shutter blade has a certain deceleration section when being closed, and when the cam ring rotates in a deceleration way, the shutter blade is always in the first position, namely, the shutter blade is always in the closed state. If the cam ring continues to rotate, when the convex part moves to the next cam, the shutter can be opened again, and the next shutter opening and closing cycle is started. Each cam can enable shutter blades to complete one cycle of motion, if the cam ring rotates one circle continuously, the same number of cycles of motion as the number of the cams can be completed, for example, when the number of the cams is four, the four cycles of motion can be completed, and high-speed continuous shooting can be realized by driving the cam ring to rotate continuously.

In any one of the above technical solutions, preferably, the cam includes a first section and a second section that are sequentially connected in a direction opposite to a rotation direction of the cam ring, an end where the first section is located is a head end, an end where the second section is located is a tail end, a height of the first section gradually increases from the head end to the tail end, and heights of the second section are equal at positions.

In the technical scheme, the shape of the cam is limited, and the shutter blades can move around the blade rotating shaft regularly under the transmission of the shape of the cam on the cam ring. Specifically, a first section and a second section are sequentially arranged in the direction opposite to the rotating direction of the cam ring, and in the rotating process of the cam ring, the shutter blades firstly contact the first section and then transition to the second section, wherein one end where the first section is located is a head end, and one end where the second section is located is a tail end. According to the requirement of the shutter device, the action from opening to closing of the shutter blades needs to be completed within a certain time, therefore, the shape of the cam is designed in such a way that in the process from closing to opening and then closing of the shutter blades, the height of the first section of the cam ring is gradually increased, the shape is slow, the shutter blades are slowly opened, the shutter blades and the elastic piece can slowly store energy, and the load of the driving device is reduced; the second section of the cam ring is set to be constant in height, the second section is a section of circular arc with equal radius, the effect is that when the cam ring rotates, the shutter blades are located at the same position and keep constant, a section of accelerating interval can be provided for closing the shutter blades, and when the cam ring rotates in an accelerating mode, the shutter blades are always in an open state.

In any of the above technical solutions, preferably, the height change rate of the first segment gradually increases from the head end to the tail end.

In this technical scheme, it is further specifically limited that the height rate of change of first section is crescent from head end to tail end, and the speed that the height increases is increasingly fast for the profile line of first section is sunken to the outside of ring body, can reduce the bellying along the ascending resistance in-process of first section, further reduces drive arrangement's load.

In any of the above solutions, preferably, the cam further includes a third section connected to the second section, and a space exists between the protruding portion and the third section during rotation of the cam ring.

In the technical scheme, the cam further comprises a third section connected to the tail end of the second section, and the height of the third section is rapidly reduced, so that the lug boss cannot be directly contacted with the third section, the shutter blade can be directly rotated to the first position under the action of the elastic member, and the action of closing the shutter is completed in a short time, and high shutter speed and high shutter time are achieved. It can be understood that, in order to ensure that the convex part is not contacted with the third section, the corresponding arc length of the third section on the ring body can be shortened, and the change rate of the height of the third section is fully improved. It is understood that, although the projection of the shutter blade cannot directly contact the third segment when this scheme is adopted, since the time for the projection to pass through the third segment is extremely short and the shutter blade is always close to the cam by the tensile force of the elastic member, it can still be considered that the shutter blade is in contact with the cam from the viewpoint of the overall structure.

In any of the above technical solutions, preferably, the driving device includes a motor and a tooth transmission member, the tooth transmission member is connected to an output end of the motor, and the tooth transmission member is provided with a first transmission tooth; the periphery wall of the ring body is provided with second transmission teeth which are continuously distributed and are meshed with the first transmission teeth.

In this solution, a driving scheme of the cam ring is specifically defined. The motor drives the tooth driving medium and moves, and then drives the cam ring through the meshing of first driving tooth and second driving tooth and rotates, and its driven contact point is located the periphery wall of cam ring, can not stretch into the inside of cam ring, has ensured that the unthreaded hole does not receive the sheltering from.

In any of the above technical solutions, preferably, the elastic member is an extension spring; the shutter device also comprises an eccentric pin which is arranged on the base, and one end of the extension spring is connected with the eccentric pin.

In the technical scheme, the extension spring serving as the elastic piece is connected to the eccentric pin fixed on the periphery of the base, and pre-tightening adjustment can be performed through the eccentric pin. Specifically, by rotating the eccentric pin, the end wire of the extension spring can be wound on or withdrawn from the eccentric pin to adjust the initial extension amount of the extension spring, so that the consistency of a plurality of extension springs in the shutter device can be adjusted, and the stability and reliability of the shutter opening and closing process can be improved.

In any of the above technical solutions, preferably, the shutter device further includes a reinforcing base plate attached to the shutter blade.

In the technical scheme, the enhancement substrate is attached to the shutter blade, so that the strength of the shutter blade can be enhanced under the action of quick opening and closing of the shutter blade, and the shutter blade is prevented from being damaged. Specifically, a reinforcing substrate is bonded to the shutter blade.

In any of the above technical solutions, preferably, the shutter blade further includes a reinforcing base plate attached to the blade body, the reinforcing base plate and the protruding portion are located on the same side of the blade body, and the reinforcing base plate is connected to the blade rotating shaft and the protruding portion at the same time.

In the technical scheme, the shutter blade also comprises a reinforcing base plate attached to the blade body, so that the strength of the shutter blade can be enhanced under the action of quick opening and closing of the shutter blade, and the damage of the shutter blade is avoided. When the shutter blade is opened and closed, the area of the blade body corresponding to the space between the lug boss and the blade rotating shaft is impacted the most, so that the strength of the shutter blade can be effectively enhanced by arranging the reinforcing substrate in the area under the condition of reducing the material of the reinforcing substrate as much as possible.

In any of the above technical solutions, preferably, the shutter device further includes a stopper portion provided on the base and located outside the cam ring, and the shutter blade abuts against the stopper portion when the boss portion moves between two adjacent cams.

In the technical scheme, the base is also provided with a limiting part positioned on the outer side of the cam ring. When the lug boss moves to a position between two adjacent cams from the surface of the cam, the lug boss can move towards the outer side direction of the cam ring under the action of the pulling force of the elastic piece, the shutter blades rotate along with the lug boss, and the limiting part is arranged to block and limit the shutter blades.

In any of the above technical solutions, preferably, the cam ring further includes a circumferential limit protrusion located on a side of the ring body facing the base, the circumferential limit protrusion extending in a circumferential direction of the ring body; the base is also provided with a circumferential limiting groove, the circumferential limiting protrusion is embedded into the circumferential limiting groove, and the circumferential limiting groove is matched with the circumferential limiting protrusion.

In the technical scheme, the circumference limiting bulges and the circumference limiting grooves which are matched with each other are respectively arranged on the ring body and the base, so that the circumferential cooperation of the ring body and the base can be realized, the cam ring is limited to perform circumferential rotation relative to the base all the time, the cam ring displacement caused by the error occurrence of the cooperation of the driving device and the cam ring is avoided, and the working reliability of the shutter device is ensured. In addition, in order to reduce the size of the shutter assembly as much as possible, the thickness of the ring body needs to be set to be thin, the thickness of the base used as a carrier is relatively thick, the circumferential limiting groove is formed in the base, and the circumferential limiting protrusion is additionally arranged on the ring body, so that structural damage to the ring body can be reduced, the ring body is guaranteed to be reliable in strength and not prone to damage in long-term rotation, the reliability of a product is improved, and the service life of the product is prolonged.

According to another aspect of the present application, there is provided a photographic apparatus, including a lens assembly, a body and a shutter device according to any of the above technical solutions, disposed on the body, so as to have all the advantages of the shutter device, and no further description is given herein.

Additional aspects and advantages of the present application will be set forth in part in the description which follows, or may be learned by practice of the present application.

Drawings

The above and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic structural diagram illustrating a shutter device according to an embodiment of the present application in an open state;

FIG. 2 illustrates a top view of a shutter apparatus in an open state according to one embodiment of the present application;

FIG. 3 illustrates a front view of a shutter apparatus in an open state according to one embodiment of the present application;

FIG. 4 is a schematic structural diagram of a shutter device in a closed state according to an embodiment of the present application;

FIG. 5 illustrates a top view of a shutter apparatus in a closed state according to one embodiment of the present application;

FIG. 6 is a schematic diagram illustrating the driving structure of the shutter device in an open state according to an embodiment of the present application;

FIG. 7 is a top view of a transmission structure of a shutter device in an open state according to an embodiment of the present application;

FIG. 8 is a bottom view of the shutter device of one embodiment of the present application showing the driving structure in an open state;

FIG. 9 is a front view of a driving structure of a shutter device in an open state according to an embodiment of the present application;

FIG. 10 illustrates a top view of a cam ring of an embodiment of the present application;

FIG. 11 illustrates a bottom view of a cam ring of an embodiment of the present application;

FIG. 12 is a schematic view showing a cam shape of a cam ring and a locus of movement of a projection when shutter blades of an embodiment of the present application are closed;

fig. 13 shows a schematic view of the structure of an eccentric pin according to an embodiment of the present application.

Wherein, the correspondence between the reference numbers and the component names in fig. 1 to 13 is:

10 base, 12 aperture, 20 cam ring, 22 ring body, 24 cam, 242 first segment, 242a front segment, 242b back segment, 244 second segment, 246 third segment, 26 second driving tooth, 28 circumferential limit projection, 30 shutter blade, 30a first shutter blade, 30b second shutter blade, 30c third shutter blade, 30d fourth shutter blade, 32 blade body, 322 driving blade, 324 switching blade, 34 projection, 36 bearing, 38 enhanced base plate, 40 extension spring, 50 driving device, 52 motor, 54 gear, 542 first driving tooth, 60 blade rotating shaft, 70 eccentric pin, 80 limit portion.

Detailed Description

In order that the above objects, features and advantages of the present application can be more clearly understood, the present application will be described in further detail with reference to the accompanying drawings and detailed description. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, however, the present application may be practiced in other ways than those described herein, and therefore the scope of the present application is not limited by the specific embodiments disclosed below.

A shutter device and a photographing device according to some embodiments of the present application are described below with reference to fig. 1 to 13.

As shown in fig. 1 to 5, an embodiment of an aspect of the present application provides a shutter device including a base 10, a cam ring 20, shutter blades 30, an elastic member (such as a tension spring 40), and a driving device 50, wherein the base 10 is provided with an aperture 12; the cam ring 20 is arranged on the base 10, the cam ring 20 comprises a ring body 22 and cams 24 connected with the inner wall of the ring body 22, all the cams 24 are distributed along the circumferential direction of the ring body 22, each cam 24 comprises at least two sections, the height of the cam 24 protruding from the inner wall of the ring body 22 to the center of the ring body 22 is taken as the height of the cam 24, and the height change rules of the cam 24 at different sections are different; the shutter blades 30 are rotatably connected with the base 10, the rotating axes of the shutter blades 30 are parallel to the axis of the ring body 22, the number of the shutter blades 30 is equal to that of the cams 24, and the shutter blades 30 are abutted against the cams 24; an extension spring 40 is connected between the base 10 and the shutter blade 30; the driving device 50 is used for driving the cam ring 20 to rotate relative to the base 10, and all the shutter blades 30 cover the light hole 12 or avoid the light hole 12 under the combined action of the pushing force of the cam 24 and the pulling force of the tension spring 40 during the rotation of the cam ring 20.

The shutter device provided by the embodiment of the application can meet the functional requirement of quick response, the size is small, the cam ring 20 and the extension spring 40 are arranged, the cam ring 20 rotates relative to the base 10 under the action of the driving device 50, the cam 24 abuts against the shutter blades 30, the shutter blades 30 can be pushed to rotate along with the height rise of the cam 24, the extension spring 40 is lengthened in the rotation process of the shutter blades 30, the extension spring 40 has the reset pulling force (namely the elastic restoring force) for pulling the shutter blades 30 to the original position, and therefore the shutter blades 30 are tightly pressed on the cam ring 20. The shutter device can control the shutter blade 30 to rotate towards the aperture 12 or away from the aperture 12 by the pushing force of the cam 24 and the pulling force of the extension spring 40, so as to open and close the aperture 12 by the shutter blade 30, namely, to open and close the shutter. Specifically, when the shutter is closed, all the shutter blades 30 are rotated to collectively cover the aperture 12, rather than a single shutter blade 30 covering the entire aperture 12, the amount and size of rotation of each shutter blade 30 can be reduced. The shutter device has small volume and small requirement on installation space, and can meet the volume requirement of the shutter between the mirrors. In addition, in the aspect of driving, only the driving device 50 needs to drive the cam ring 20 to rotate, the realization is easy, the reliability is high, and the functional requirements are met. Specifically, the number of the cams 24 and the shutter blades 30 is four. It is understood that, in order to ensure that the shutter blades 30 do not interfere with each other during the shutter opening and closing process, the shutter blades 30 may be disposed at different heights, for example, as shown in fig. 1, 2, 4 and 5, and the four shutter blades 30 at the upper, left, right and lower sides are respectively referred to as a first shutter blade 30a, a second shutter blade 30b, a third shutter blade 30c and a fourth shutter blade 30d, and the heights thereof are gradually decreased in the above order. Alternatively, each shutter blade 30 is connected with a tension spring 40, each shutter blade 30 may be connected with one tension spring 40, that is, the number of the tension springs is equal, or each shutter blade 30 may be connected with two or more tension springs 40. Optionally, the shutter device is an inter-mirror shutter.

As shown in fig. 1, in some embodiments, the shutter device further includes a blade rotating shaft 60 disposed on the base 10 and located outside the cam ring 20; the shutter blade 30 includes a blade body 32 and a boss 34, the blade body 32 being rotatably connected to a blade rotating shaft 60; the projection 34 is provided on the vane body 32 and located inside the cam ring 20, the projection 34 may contact the cam 24, and the tension spring 40 is elongated in a process in which the cam 24 pushes the projection 34 to move toward the center of the cam ring 20.

In this embodiment, the connection relationship of the shutter blade 30 to the base 10 and the fitting relationship of the shutter blade 30 to the cam 24 and the tension spring 40 are specifically defined. The shutter blade 30 is rotatably connected to the base 10 via a blade rotating shaft 60 such that its axis of rotation is located outside the cam ring 20, and the blade body 32 is rotatable inside the cam ring 20 to perform shutter opening and closing. The cam 24 is matched with the boss 34, the boss 34 and the cam 24 are located on the same horizontal plane, and the vane body 32 can be located on a different horizontal plane, so that the cam 24 does not need to directly push the vane body 32, a reasonable matching point (namely the position of the boss 34) is set according to needs, and the peripheral structure of the vane body 32 is simple. In addition, when the cam 24 pushes the protrusion 34 to move toward the center of the cam ring 20, the blade body 32 can rotate in the corresponding direction, and at this time, the extension spring 40 only needs to be elongated, and the shutter blade 30 can be pulled back by the elastic restoring force after the cam 24 pushes the protrusion 34 to the highest point, so that the rotation in the other direction is realized, and the pushing force of the cam 24 and the pulling force of the extension spring 40 can both normally act to realize the opening and closing of the shutter.

As shown in fig. 6-9, in some embodiments, a tension spring 40 is coupled to the boss 34.

In this embodiment, the extension spring 40 is directly connected to the conventional protrusion 34, so that there is no need to provide another connecting structure on the blade body 32, and there is no need to connect the extension spring 40 directly to the blade body 32 to break the structural strength of the bowl-shaped blade body 32, which is helpful to simplify the structure and improve the reliability of the product. Further, as shown in FIG. 6, the shutter blade 30 further includes a bearing 36 disposed on and engaged with the boss 34, and the bearing 36 contacts with the cam 24, so as to help share the load of the boss 34, reduce the damage to the boss 34, improve the reliability of the product, and prolong the service life of the product. Specifically, the bearing 36 is of unitary construction with the boss 34.

As shown in fig. 4 and 5, in some embodiments, the blade body 32 includes a driving blade 322 and a switching blade 324, the driving blade 322 is rotatably connected to the blade rotating shaft 60, the protrusion 34 is disposed on the driving blade 322, and the driving blade 322 avoids the light hole 12; the switching blade 324 is connected to the driving blade 322, and in case the shutter blade 30 is in the first position covering the aperture 12, the switching blade 324 blocks a partial area of the aperture 12.

In this embodiment, dividing the blade body 32 into the driving blade 322 and the opening and closing blade 324, and disposing the projection 34 on the driving blade 322 near the blade rotation shaft 60, the rotation radius of the projection 34 can be reduced, and accordingly the height of the cam 24 projecting toward the center of the ring body 22 can be reduced. On one hand, the structure is simplified, the weight of the product is reduced, and materials are saved; on the other hand, since the cam 24 is away from the opening and closing blade 324, the cam 24 does not protrude into the light hole 12 to cause blocking, ensuring the normal operation of the shutter. It will be appreciated that the driving blade 322 and the opening and closing blade 324 are integrally formed as a single body, and are divided into regions for distinguishing different functions.

As shown in fig. 4 and 5, in some embodiments, when the shutter blade 30 is at the first position, the blade body 32 extends from the end connected to the blade rotation shaft 60 toward the direction opposite to the rotation direction of the cam ring 20, and bends and extends toward the center of the cam ring 20, the part of the blade body 32 before bending is a transmission blade 322, and the part of the blade body 32 after bending is a switching blade 324; all the cams 24 are evenly spaced in the circumferential direction of the ring body 22, and during the rotation of the cam ring 20, the cams 24 push the shutter blades 30 to rotate from the first position to the second position avoiding the aperture 12, and the extension springs 40 pull the shutter blades 30 to rotate from the second position back to the first position.

In this embodiment, when the shutter blade 30 is in the first position, the driving blade 322 extends from the end connected to the blade rotation shaft 60 toward the direction opposite to the rotation direction of the cam ring 20, and the switching blade 324 extends toward the center of the cam ring 20, blocking a partial area of the light hole 12, and all the switching blades 324 collectively cover the light hole 12. As the cam ring 20 rotates, the cam 24 pushes the protrusion 34 to move toward the center of the cam ring 20, the transmission vane 322 rotates along with it, the switch vane 324 is driven to move away from the center of the cam ring 20, and the extension spring 40 is simultaneously extended. As shown in fig. 1, 2, 6-8, the cam ring 20 rotates counterclockwise, and when the shutter blade 30 rotates to the second position, the projection 34 moves to the highest point of the cam 24, and the opening and closing blade 324 moves completely out of the aperture 12, thereby opening the shutter. Thereafter, the cam ring 20 continues to rotate, and as the height of the cam 24 decreases, the cam 24 can no longer push the boss 34 to maintain the second position, the shutter blade 30 rotates to the first position under the pulling force of the tension spring 40, and the switching blade 324 moves toward the center of the cam ring 20, as shown in fig. 4 and 5, when the switching blade 324 reaches the first position, the aperture 12 is completely covered, and the shutter is closed, so that a periodic motion of the shutter blade 30 from closing to opening and then closing is completed. After that, the convex portion 34 of the shutter blade 30 is located in the spacing area between two adjacent cams 24, which can be understood as an arc with equal radius, so that the shutter blade 30 has a certain deceleration section when closed, and when the cam ring 20 rotates at a decelerated speed, the shutter blade 30 is always in the first position, i.e. always in the closed state. If the cam ring 20 continues to rotate, the shutter can be opened again when the projection 34 moves to the next cam 24, and the next cycle of shutter opening and closing is entered. Each cam 24 can make shutter blades 30 complete one cycle, and if cam ring 20 rotates one turn continuously, the same number of cycles as cam 24 can be completed, for example, if the number of cam 24 is four, four cycles can be completed, and by driving cam ring 20 to rotate continuously, high-speed continuous shooting can be realized.

It can be understood that, since the shutter needs to be closed for most of the time and only opens for a short time during shooting, the arc length of the cams 24 distributed at intervals on the ring body 22 occupies a small proportion of the circumference of the ring body 22, which helps to save materials and reduce the weight of the product, and the specific proportion can be calculated according to the actual structure of the shutter device.

In other embodiments, the blade body 32 may not be bent, but rather driven in a manner opposite to that of the previous embodiment, the cam 24 pushes the shutter blade 30 to rotate from the second position to the first position to close the shutter, and the extension spring 40 pulls the shutter blade 30 to rotate from the second position to the first position to open the shutter, and similarly, since the shutter needs to be closed most of the time, the arc length of the cam 24 corresponding to the ring body 22 occupies a higher proportion of the circumference of the ring body 22.

As shown in fig. 10 to 12, in some embodiments, cam 24 includes a first segment 242 and a second segment 244 connected in series in a direction opposite to the rotation direction of cam ring 20, with an end at which first segment 242 is located being a head end and an end at which second segment 244 is located being a tail end, and the height of first segment 242 gradually increases from the head end to the tail end, and the height of second segment 244 is equal at all points.

In this embodiment, the shape of cam 24 is defined such that shutter blade 30 moves regularly about blade rotation axis 60 as a result of the shape of cam 24 on cam ring 20. Specifically, a first section 242 and a second section 244 are sequentially provided in a direction opposite to the rotation direction of the cam ring 20, for example, as shown in fig. 10, when the cam ring 20 rotates in the counterclockwise direction, the first section 242 and the second section 244 are arranged in the clockwise direction, and during the rotation of the cam ring 20, the shutter blade 30 contacts the first section 242 first and then transits to the second section 244, with the end where the first section 242 is located as a head end and the end where the second section 244 is located as a tail end. According to the requirement of the shutter device, the motion of opening and closing the shutter blades 30 needs to be completed within a certain time, therefore, the shape of the cam 24 is designed such that, in the process of closing, opening and closing the shutter blades 30, the height of the first section 242 of the cam ring 20 gradually rises, the shape is slow, the shutter blades 30 slowly open, the shutter blades 30 and the tension spring 40 can slowly accumulate energy, and the load of the driving device 50 is reduced; when the second segment 244 of the cam ring 20 is set to have a constant height, the second segment 244 is an arc with an equal radius, and functions such that when the cam ring 20 rotates, the shutter blades 30 are in the same position and remain constant, and a section of acceleration interval can be provided when the shutter blades 30 are closed, and when the cam ring 20 rotates in an accelerated manner, the shutter blades 30 are always in an open state. It will be appreciated that by controlling the arc length of the second segment 244 relative to the ring body 22 and the rotational speed of the cam ring 20, the length of time that the shutter remains open can be controlled.

As shown in fig. 10-12, in some embodiments, the height change rate of the first segment 242 gradually increases from the leading end to the trailing end.

In this embodiment, it is further specifically defined that the height change rate of the first segment 242 gradually increases from the head end to the tail end, i.e., the height increases more and more rapidly, so that the contour line of the first segment 242 is concave toward the outer side of the ring body 22, which can reduce the resistance of the protrusion 34 during the ascending along the first segment 242, and further reduce the load of the driving device 50. Specifically, the first segment 242 may be optimized in shape according to the torque requirement of the driving device 50, for example, as shown in fig. 10, the first segment 242 is further divided into two segments, the height change rate of the front segment 242a occupying the main body portion gradually increases from the head end to the tail end, the height change rate of the rear segment 242b gradually decreases from the head end to the tail end, so that the contour line of the rear segment 242b protrudes toward the inner side of the ring body 22 and can smoothly connect with the second segment 244, and the load of the driving device 50 is further reduced, so that the shutter blade 30 is opened slowly, and the tension spring 40 is extended slowly to store energy.

In some embodiments, as shown in fig. 10 and 11, cam 24 further includes a third segment 246 connected to second segment 244, as shown in fig. 12, and during rotation of cam ring 20, there is a spacing between lobes 34 and third segment 246.

In this embodiment, the cam 24 further includes a third segment 246 connected to the end of the second segment 244, and the height of the third segment 246 is rapidly reduced, as shown in fig. 12, L is the moving track curve of the projection 34 during the closing process of the shutter blade 30, and it can be seen that in this process, there is a distance between the projection 34 and the third segment 246 of the cam 24, that is, the projection 34 cannot directly contact the third segment 246, which can cause the shutter blade 30 to directly rotate to the first position under the action of the extension spring 40, and complete the shutter closing operation in a short time, thereby achieving a higher shutter speed and a faster shutter time. It will be appreciated that to ensure that the boss 34 is not in contact with the third segment 246, the corresponding arc length of the third segment 246 on the ring body 22 can be reduced, substantially increasing the rate of change of the height of the third segment 246. It is understood that, although the projection 34 of the shutter blade 30 cannot directly contact the third segment 246 when this scheme is adopted, since the time during which the projection 34 passes through the third segment 246 is extremely short and the shutter blade 30 is always close to the cam 24 by the tension of the tension spring 40, it can still be considered that the shutter blade 30 abuts against the cam 24 from the viewpoint of the overall structure.

As shown in fig. 6 and 7, in some embodiments, the driving device 50 includes a motor 52 and a tooth transmission member (e.g., a gear 54), the gear 54 is connected to an output end of the motor 52, and the gear 54 is provided with a first transmission tooth 542; the outer peripheral wall of the ring body 22 is provided with second transmission teeth 26 which are continuously distributed, and the second transmission teeth 26 are meshed with the first transmission teeth 542.

In this embodiment, the driving scheme of the cam ring 20 is specifically defined. The motor 52 drives the gear 54 to move, so that the cam ring 20 is driven to rotate through the meshing of the first transmission teeth 542 and the second transmission teeth 26, and the transmission contact point is located on the outer peripheral wall of the cam ring 20 and does not extend into the inner part of the cam ring 20, so that the light hole 12 is ensured not to be blocked. The motor 52 is embodied as a stepping motor, but may be other electric driving elements having similar functions. Alternatively, the gear transmission member may be a worm gear mechanism or the like having a similar function, in addition to the gear 54.

As shown in fig. 6 to 9 and 13, in some embodiments, the shutter device further includes an eccentric pin 70 provided on the base 10, and one end of the extension spring 40 is connected to the eccentric pin 70.

In this embodiment, the extension spring 40 is connected to an eccentric pin 70 fixed to the periphery of the base 10, and the preload adjustment is performed by the eccentric pin 70. Specifically, by rotating the eccentric pin 70, the end wire of the extension spring 40 can be wound around the eccentric pin 70 or withdrawn from the eccentric pin 70 to adjust the initial extension amount of the extension spring 40, so that the consistency of the plurality of extension springs 40 in the shutter device can be adjusted, and the stability and reliability of the shutter opening and closing process can be improved.

As shown in FIGS. 6-8, in some embodiments, the shutter device further includes a reinforcing base 38 attached to the shutter blade 30.

In this embodiment, by attaching the reinforcing base plate 38 to the shutter blade 30, the strength of the shutter blade 30 can be increased to prevent damage to the shutter blade 30 during rapid opening and closing movements of the shutter blade 30. Specifically, the reinforcing substrate 38 is bonded to the shutter blade 30.

6-8, in some embodiments, the shutter blade 30 further includes a reinforcing base 38 attached to the blade body 32, the reinforcing base 38 and the boss 34 being on the same side of the blade body 32, the reinforcing base 38 connecting both the blade rotational axis 60 and the boss 34.

In this embodiment, the shutter blade 30 also includes a reinforcing base 38 attached to the blade body 32 to reinforce the shutter blade 30 from damage during rapid opening and closing movement of the shutter blade 30. Since the area of the blade body 32 corresponding to the area between the boss 34 and the blade rotation shaft 60 receives the largest impact when the shutter blade 30 is opened and closed, the strength of the shutter blade 30 can be effectively increased by providing the reinforcing base plate 38 in this area while minimizing the material used for the reinforcing base plate 38.

In some embodiments, the shutter device further includes a stopper portion 80 provided on the base 10 and located outside the cam ring 20, and the shutter blade 30 abuts against the stopper portion 80 in a case where the boss portion 34 moves between two adjacent cams 24.

In this embodiment, the base 10 is further provided with a stopper 80 located outside the cam ring 20. When the projection 34 moves from the surface of the cam 24 to between two adjacent cams 24, the projection 34 moves toward the outside of the cam ring 20 by the pulling force of the tension spring 40, the shutter blade 30 rotates, and the position limiting part 80 is provided to block and limit the shutter blade 30. Further, with the shutter device shown in fig. 4 and 5, when the shutter blade 30 is closed, the boss 34 is rapidly moved toward the outside of the cam ring 20 by the tensile force of the tension spring 40, and the shutter blade 30 is decelerated by the deceleration of the driving device 50 and the simultaneous impact of the shutter blade 30 against the stopper 80.

As shown in fig. 11, in some embodiments, the cam ring 20 further includes a circumferential limit projection 28 on a side of the ring body 22 facing the base 10, the circumferential limit projection 28 extending in a circumferential direction of the ring body 22; the base 10 is further provided with a circumferential limiting groove (not shown in the figure), and the circumferential limiting protrusion 28 is embedded in the circumferential limiting groove, and the circumferential limiting groove is matched with the circumferential limiting protrusion 28.

In this embodiment, the circumferential limiting protrusion 28 and the circumferential limiting groove are respectively disposed on the ring body 22 and the base 10, so that the circumferential engagement therebetween can be realized, the cam ring 20 is limited to perform circumferential rotation relative to the base 10 all the time, the cam ring 20 is prevented from being displaced when the driving device 50 is engaged with the cam ring 20 in error, and the reliability of the operation of the shutter device is ensured. In addition, in order to reduce the volume of the shutter assembly as much as possible, the thickness of the ring body 22 needs to be set to be thin, the thickness of the base 10 serving as a carrier is relatively thick, the circumferential limiting groove is formed in the base 10, and the circumferential limiting protrusion 28 is additionally arranged on the ring body 22, so that structural damage to the ring body 22 can be reduced, the ring body 22 is ensured to have reliable strength in long-term rotation and is not easy to damage, the reliability of a product is improved, and the service life of the product is prolonged.

An embodiment of another aspect of the present application provides a photographic apparatus, including a lens assembly, a body, and the shutter device of any of the above embodiments disposed on the body, so that all the advantages of the shutter device are achieved, and details are not repeated herein. Alternatively, the photographing device may be a camera, such as a single lens reflex camera, and the photographing device may also be a video camera.

In summary, in order to solve the problems of the inter-mirror shutter function and the size, the embodiments of the present application provide a shutter device based on a cam spring structure, and a photographing device using the shutter device. The shutter device drives the cam ring 20 to rotate through the motor 52 and the gear 54, and further drives the bearing 36 fixed on the convex part 34 to move, the convex part 34 is pressed against the cam ring 20 through the extension spring 40, and the shutter opening and closing effects are achieved through the shape design of the cam 24 on the cam ring 20 and the shape design of the shutter blade 30. By the cooperation of the cam ring 20 and the projection 34, and the force of the tension spring 40, the shutter blades 30 open and close rapidly during the rotation of the cam ring 20, and the shutter blades are small and compact. In a photographing device requiring an inter-mirror shutter, the shutter device meeting higher shutter speed and smaller size provided by the embodiment of the application can be used, so that the requirement of photographing can be met, and the photographing device can be made smaller.

In this application, the term "plurality" means two or more unless explicitly defined otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A shutter device, comprising:

the base is provided with a light hole;

the cam ring is arranged on the base and comprises a ring body and cams connected with the inner wall of the ring body, all the cams are distributed along the circumferential direction of the ring body, each cam comprises at least two sections, the height of the cam protruding from the inner wall of the ring body to the center of the ring body is taken as the height of the cam, and the height change rules of the cam at different sections are different;

the shutter blades are rotatably connected with the base, the rotating axes of the shutter blades are parallel to the axis of the ring body, the number of the shutter blades is equal to that of the cams, and the shutter blades are abutted against the cams;

an elastic member connected between the base and the shutter blade; and

and the driving device is used for driving the cam ring to rotate relative to the base, and all the shutter blades cover the light hole or avoid the light hole under the combined action of the pushing force of the cam and the pulling force of the elastic piece in the rotating process of the cam ring.

2. The shutter device according to claim 1,

the shutter device further includes:

a vane rotating shaft disposed on the base and located outside the cam ring;

the shutter blade includes:

the blade body is rotatably connected with the blade rotating shaft; and

and the bulge part is arranged on the vane body and positioned on the inner side of the cam ring, the bulge part can be in contact with the cam, and the elastic part is elongated in the process that the cam pushes the bulge part to move towards the center direction of the cam ring.

3. The shutter device according to claim 2,

the elastic piece is connected with the protruding part.

4. The shutter device according to claim 2, wherein the blade body comprises:

the transmission blade is rotatably connected with the blade rotating shaft, the bulge part is arranged on the transmission blade, and the transmission blade avoids the unthreaded hole; and

a switching blade connected to the driving blade, the switching blade blocking a partial area of the aperture in a case where the shutter blade is in a first position covering the aperture.

5. The shutter device according to claim 4,

when the shutter blade is at the first position, the blade body extends from one end connected with the blade rotating shaft to the direction opposite to the rotating direction of the cam ring, and then bends and extends towards the center direction of the cam ring, the part of the blade body before bending is the transmission blade, and the part of the blade body after bending is the switch blade;

all the cams are evenly distributed at intervals along the circumferential direction of the ring body, in the rotating process of the cam ring, the cams push the shutter blades to rotate from the first position to the second position avoiding the unthreaded hole, and the elastic pieces pull the shutter blades to rotate from the second position back to the first position.

6. The shutter device according to claim 5,

the cam comprises a first section and a second section which are sequentially connected in the direction opposite to the rotation direction of the cam ring, one end where the first section is located is used as a head end, one end where the second section is located is used as a tail end, the height of the first section gradually rises from the head end to the tail end, and the heights of the second section are equal everywhere.

7. The shutter device according to claim 6,

the height change rate of the first section gradually increases from the head end to the tail end.

8. The shutter device according to claim 7,

the cam also includes a third segment connected to the second segment, and a space exists between the boss and the third segment during rotation of the cam ring.

9. The shutter device according to any one of claims 1 to 8,

the driving device includes:

a motor; and

the gear transmission part is connected with the output end of the motor and is provided with a first transmission gear;

the outer peripheral wall of the ring body is provided with second transmission teeth which are continuously distributed, and the second transmission teeth are meshed with the first transmission teeth.

10. The shutter device according to any one of claims 1 to 8,

the elastic piece is an extension spring;

the shutter device further comprises an eccentric pin arranged on the base, and one end of the extension spring is connected with the eccentric pin.

11. The shutter device according to any one of claims 1 to 8, further comprising a reinforcing base plate attached to the shutter blade.

12. The shutter device according to any one of claims 2 to 8, wherein the shutter blade further includes a reinforcing base plate attached to the blade body, the reinforcing base plate and the boss portion being located on the same side of the blade body, the reinforcing base plate connecting the blade rotation shaft and the boss portion at the same time.

13. The shutter device according to any one of claims 2 to 8, further comprising a stopper portion provided on the base and located outside the cam ring, the shutter blade being abutted against the stopper portion in a case where the boss portion is moved between adjacent two of the cams.

14. The shutter device according to any one of claims 1 to 8,

the cam ring further comprises a circumferential limiting bulge, the circumferential limiting bulge is positioned on one side, facing the base, of the ring body, and the circumferential limiting bulge extends along the circumferential direction of the ring body;

the base is further provided with a circumferential limiting groove, the circumferential limiting protrusion is embedded into the circumferential limiting groove, and the circumferential limiting groove is matched with the circumferential limiting protrusion.

15. A photographing apparatus, comprising:

a lens assembly;

a body;

and a shutter device according to any one of claims 1 to 14 provided on the body.