Patent Description:
A photographing apparatus, such as a camera, is typically provided with a shutter for controlling an exposure time. The shutter includes a shutter mechanism and a blade assembly in a transmission connection with the shutter mechanism. The shutter mechanism controls a closing speed of the blade assembly, so as to control the exposure time of the camera.

However, since the blade assembly has a relatively high closing speed, when the blade assembly closes an exposure opening of the camera, some components in the shutter mechanism may be subjected to a large impact force, which may damage the shutter mechanism.

<CIT> discloses: Miniaturization by simplification of a structure is achieved while suppressing a bound of an opening/closing blade and securing improvement of functionality. A blade opening/closing apparatus includes: a base body that includes an aperture; a driving body that is movably supported by the base body and is operated by a driving force of a drive source; an opening/closing blade that is moved by an operation of the driving body and opens/closes the aperture; and a braking body that controls a movement speed of the opening/closing blade via the driving body, the driving body including, on one surface thereof, an engagement portion that is to be engaged with the opening/closing blade and transmits the driving force to the opening/closing blade, the driving body including, on another surface thereof, a braked portion to which a braking force of the braking body is to be applied.

<CIT> discloses: PURPOSE:To prevent aperture blades from bounding due to the collision between an opening/closing ring for the aperture blades and a rotational angle specifying part by extending a tension spring between the opening/closing ring and a damping member, and hooking one of hooks at both ends of the spring to the damping member or opening/closing ring in a relatively movable state. CONSTITUTION:The opening/closing ring is energized in the opposite direction of an arrow A to close the aperture fully before shutter release, so the damping ring is drawn by the tension spring in the same direction with the opening/closing ring to allow a collision surface to contact a set pin. When a shutter button is pressed, the opening/closing ring is put in stop-down operation as shown by the arrow A before the shutter operates. When the opening/closing ring is rotated, the hook of the tension spring moves in a run-off hole after the tensile force of the spring is ceased, so the damping ring does not rotate in the same direction and the rotational-angle specifying pin abuts on the collision surface. This collision reduces the rotating speeds of the rotational angle specifying pin and opening/closing ring and the damping ring receives the energy of rotation from the opening/ closing ring to rotate up to an angle of rotation corresponding to a set aperture value, preventing the bounding of the aperture blades.

<CIT> discloses: Photographic camera such as a reflex camera, of the type having at least one automatic region in which the diaphragm blades of a diaphragm blade aperture system, incorporated in the objective lens arrangement connected, e.g. in front of a light sensitive element for sensing ambient light, are adjustable from an initial position corresponding to the smallest diaphragm aperture width to a diaphragm aperture width adequate for the prevailing light conditions, in dependence upon such sensed ambient light, by means of a driving member or driving ring of an energizable driving system for the diaphragm blade aperture system which is energizable with electrical current pulses, e.g. via an electronic control circuit, in a continuous progressive adjustment movement, such that the continuous progressive adjustment movement of the diaphragm blades is effected under the continuous sliding frictional contact resistance of a spring loaded friction brake acting against the driving member for the diaphragm blades and securing the driving member simultaneously in the corresponding adjustment end position attained, e.g. in dependence upon such sensed ambient light, and which friction brake at the end of the camera exposure operation, i.e. after taking the photograph, is temporarily disengageable electromagnetically from its operative frictional contact position to permit the delay free, i.e. frictional contact free, return of the diaphragm blades back to the initial position thereof.

In order to overcome the above-mentioned defect in the existing technologies, an object of the embodiments of the present invention is to provide a shutter and a photographing apparatus, where a shutter mechanism thereof may be buffered when a blade assembly thereof closes an exposure opening of a camera, so as to prevent the shutter mechanism from being damaged.

In a first aspect, an embodiment of the present invention provides a shutter as defined in claim <NUM>.

Optional embodiments are defined in the dependent claims.

In a second aspect, an embodiment of the present invention further provides a photographing apparatus, including the shutter described in the first aspect.

In the shutter and the photographing apparatus according to the embodiments of the present invention, the shutter includes the shutter base, the shutter mechanism and the braking member; the blade assembly in the shutter mechanism may close and open the exposure opening of the shutter under a driving effect of the synchronizer ring. When the blade assembly closes the exposure opening, the braking member may decelerate the shutter mechanism, so as to reduce the impact force applied to the shutter mechanism when the exposure opening is closed, thus avoiding the damage to the shutter mechanism.

To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the following clearly and fully describes the technical solutions of the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are merely some but not all of the embodiments of the present invention.

For convenience of description of the present embodiment, a first side of a shutter base in the present embodiment refers to a front side of the shutter base, and a second side of the shutter base refers to a back side of the shutter base.

As shown in <FIG>, a shutter according to an embodiment of the present invention includes a shutter base <NUM>, a shutter mechanism, and a braking member for decelerating the shutter mechanism; the shutter base <NUM> is provided with an exposure opening <NUM>; in an embodiment, the exposure opening <NUM> may be a part of the shutter base <NUM>; in an embodiment, the exposure opening <NUM> may be formed by other components and provided in the shutter base <NUM>. The shutter mechanism includes a blade assembly <NUM> and a synchronizer ring <NUM> for driving the blade assembly <NUM>. The synchronizer ring <NUM> is movable between a first position and a second position, and the exposure opening <NUM> is open when the synchronizer ring <NUM> is in the first position, and closed when the synchronizer ring <NUM> is in the second position.

In an embodiment, the shutter mechanism is mounted on the shutter base <NUM>, and the shutter mechanism further includes a driving device <NUM> for driving the synchronizer ring <NUM>. The synchronizer ring <NUM> and the driving device <NUM> may be provided on a first side of the shutter base <NUM>, and the driving device <NUM> is in a transmissin connection with the synchronizer ring <NUM> and drives the synchronizer ring <NUM> to rotate relative to the shutter base <NUM>. The blade assembly <NUM> may be provided on a second side of the shutter base <NUM>, and the blade assembly <NUM> is in a transmission connection with the synchronizer ring <NUM>.

In an embodiment, the synchronizer ring <NUM> may be provided to surround the exposure opening <NUM>. Optionally, a plurality of driving devices <NUM> and a plurality of blade assemblies <NUM> may be provided to surround the exposure opening <NUM>. The driving devices <NUM> synchronously drive the synchronizer ring <NUM> to rotate, and the synchronizer ring <NUM> may drive each blade assembly <NUM> to rotate relative to the shutter base <NUM>, so as to close or open the exposure opening <NUM>. The blade assembly <NUM> may be driven to rotate towards or away from the exposure opening <NUM> by the synchronizer ring <NUM>, such that the exposure opening <NUM> is in an open state when the synchronizer ring <NUM> is located at the first position; when the synchronizer ring <NUM> is located at the second position, the exposure opening <NUM> is in a closed state, and in this case, the braking member may decelerate the shutter mechanism to reduce an impact force applied to the shutter mechanism.

Specifically, as shown in <FIG> and <FIG>, in an embodiment, the shutter base <NUM> may be a circular mounting plate, and a circular through hole is provided at a center of the circular mounting plate to form the exposure opening <NUM>. An annular slot or an annular flange, or the like, for mounting the shutter mechanism is provided on a side of the shutter base <NUM> facing the shutter mechanism; an annular slot is optionally provided for the shutter base <NUM> to reduce a mounting space of the shutter base <NUM>.

As shown in <FIG> and <FIG>, the shutter mechanism includes the synchronizer ring <NUM>, the plurality of blade assemblies <NUM>, and the plurality of driving devices <NUM>, the synchronizer ring <NUM> may be provided on the first side of the shutter base <NUM>, and the synchronizer ring <NUM> is mounted in an annular mounting slot of the shutter base <NUM>. The plurality of driving devices <NUM> are all located on the first side of the shutter base <NUM>, and the plurality of driving devices <NUM> may be evenly distributed on the synchronizer ring <NUM> circumferentially; the plurality of driving devices <NUM> are in transmission connection with the synchronizer ring <NUM>, and may synchronously drive the synchronizer ring <NUM> to rotate relative to the shutter base <NUM>.

The driving device <NUM> includes a driving shaft, the synchronizer ring <NUM> is provided with a driving slide slot <NUM> fitted with the driving shaft, and the driving shaft may be fitted with the driving slide slot <NUM> to swing and drive the synchronizer ring <NUM> to rotate; meanwhile, the driving shaft may also slide in the driving slide slot <NUM>. As driven by the driving device <NUM>, the synchronizer ring <NUM> may rotate relative to the exposure opening <NUM>, and a rotation axis of the synchronizer ring <NUM> coincides with a center line of the exposure opening <NUM>.

Each blade assembly <NUM> is provided on the second side of the shutter base <NUM>, and each blade assembly <NUM> includes at least one blade. In the present embodiment, in order to reduce a rotation range of each blade, the blade assembly <NUM> may rapidly close the exposure opening <NUM>; the plurality of blade assemblies <NUM> are connected to the synchronizer ring <NUM>, each blade assembly <NUM> includes a first blade <NUM> and a second blade <NUM> which are hinged together, and the first blade <NUM> and the second blade <NUM> may be driven to rotate relative to the shutter base <NUM> by the synchronizer ring <NUM>. When the synchronizer ring <NUM> is located at the first position, the first blade <NUM> and the second blade <NUM> are both located outside the exposure opening <NUM>, and the exposure opening <NUM> is thus opened. When the synchronizer ring <NUM> is located at the second position, the first blade <NUM> and the second blade <NUM> together cover the exposure opening <NUM>, and the exposure opening <NUM> is thus closed.

For example, the synchronizer ring <NUM> is provided with five blade assemblies <NUM>, four of which are mounted on the synchronizer ring <NUM> in a first state (forwardly mounted) and one of which is mounted on the synchronizer ring <NUM> in a second state (reversely mounted); such an arrangement may avoid collision among the blades when the exposure opening is closed. When the blade assembly <NUM> is forwardly mounted on the synchronizer ring <NUM>, the first blade <NUM> is provided close to the second side of the shutter base <NUM> and the second blade <NUM> is located on a side of the first blade <NUM> apart from the shutter base <NUM>. When the blade assembly <NUM> is reversely mounted on the synchronizer ring <NUM>, the second blade <NUM> is provided close to the second side of the shutter base <NUM> and the first blade <NUM> is located on a side of the second blade <NUM> apart from the shutter base <NUM>. The blades of all the blade assemblies <NUM> provided on the synchronizer ring <NUM> are located at different planes to prevent the blades from interfering with each other during rotation, thereby ensuring that the blade assemblies <NUM> fully close the exposure opening <NUM>.

A side of the synchronizer ring <NUM> facing the blade assemblies <NUM> is in transmission connection with the blade assemblies <NUM> and drives each blade assembly <NUM>; the side of the synchronizer ring <NUM> facing the blade assembly <NUM> is provided with a first driving shaft <NUM> and a second driving shaft <NUM>, the first blade <NUM> is in transmission connection with the first driving shaft <NUM> via a first connecting member provided thereon, and the second blade <NUM> is in transmission connection with the second driving shaft <NUM> via a second connecting member provided thereon. While the synchronizer ring <NUM> rotates, the first blade <NUM> is driven to rotate by the first driving shaft <NUM>, and the second blade <NUM> is driven to rotate by the second driving shaft <NUM>.

Exemplarily, the first connecting member may be a first driving slot or a first driving hole <NUM> provided on the first blade <NUM>, and the first driving shaft <NUM> is slidably provided in the first driving slot or the first driving hole <NUM>; similarly, the second connecting member may be a second driving slot or a second driving hole <NUM> provided in the second blade <NUM>, and the second driving shaft <NUM> is slidably provided in the second driving slot or the second driving hole <NUM>.

Further, for example, if the first connecting member is the first driving hole <NUM> and the second connecting member is the second driving hole <NUM>, the first driving hole <NUM> provided on the first blade <NUM> extends in a direction perpendicular to a rotation axis of the first blade <NUM>, such that the first driving shaft <NUM> may slide in the first driving hole <NUM> on the first blade <NUM> while rotating. The second driving hole <NUM> provided in the second blade <NUM> extends in a direction perpendicular to a rotation axis of the second blade <NUM>, such that the second driving shaft <NUM> may slide in the second driving hole <NUM> in the second blade <NUM> while rotating.

To enhance structural strength of the first blade <NUM> and the second blade <NUM>, so as to prevent the first blade <NUM> and the second blade <NUM> from being broken and improve a reliability of the blade assembly <NUM>, in the present embodiment, a first reinforcing sheet <NUM> is provided on a back side of the first blade <NUM>, the first reinforcing sheet <NUM> is provided at an edge of the first blade <NUM> and located in a region where the first driving hole <NUM> is located, the first reinforcing sheet <NUM> may cover the region where the first driving hole <NUM> is located, and the first reinforcing sheet <NUM> is provided with a through hole communicated with the first driving hole <NUM>. Similarly, a second reinforcing sheet <NUM> is provided on a back side of the second blade <NUM>, the second reinforcing sheet <NUM> is provided at an edge of the second blade <NUM> and located in a region where the second driving hole <NUM> is located, the second reinforcing sheet <NUM> may cover the region where the second driving hole <NUM> is located, and the second reinforcing sheet <NUM> is provided with a through hole communicated with the second driving hole <NUM>.

As shown in <FIG>, the braking member in the present embodiment includes at least one of a braking ring <NUM>, a friction member <NUM>, and a biasing member <NUM>; in an embodiment, the braking ring <NUM> and the friction member <NUM> may be provided on a same side; for example, the braking ring <NUM> and the friction member <NUM> are provided on the first side of the shutter base <NUM> and the biasing member <NUM> is provided on the second side of the shutter base <NUM>.

Specifically, as shown in <FIG> and <FIG>, the braking member in the present embodiment includes the braking ring <NUM> for decelerating the shutter mechanism by restricting a position of the synchronizer ring <NUM>. In an embodiment, the braking ring <NUM> may be made of a plastic material and has a certain elasticity, such that when the braking ring <NUM> collides with the synchronizer ring <NUM> (that is, the braking ring <NUM> limits the position of the synchronizer ring <NUM>), a part of momentum transferred from the synchronizer ring <NUM> to the braking ring <NUM> may be absorbed, thereby decelerating the shutter mechanism.

For example, the braking ring <NUM> may be located on the first side of the shutter base <NUM>; that is, the braking ring <NUM> and the synchronizer ring <NUM> are located on a same side of the shutter base <NUM>; the braking ring <NUM> is provided around the exposure opening <NUM>, the braking ring <NUM> is located on a side of the synchronizer ring <NUM> apart from the exposure opening <NUM>, and the braking ring <NUM> may be provided coaxially with the synchronizer ring <NUM> and the exposure opening <NUM>; that is, the braking ring <NUM> may be sleeved over the side of the synchronizer ring <NUM> apart from the exposure opening <NUM>, and the braking ring <NUM>, the synchronizer ring <NUM> and the exposure opening <NUM> are coaxial. It may be understood that the braking ring <NUM> in the present embodiment may also be arranged on a side of the synchronizer ring <NUM> close to the exposure opening <NUM>; that is, the braking ring <NUM> is provided in the synchronizer ring <NUM>; optionally, the braking ring <NUM>, the synchronizer ring <NUM>, and the exposure opening <NUM> may not be provided coaxially.

As shown in <FIG> and <FIG>, the synchronizer ring <NUM> includes a limiting protrusion <NUM> movable between the first position and the second position. The braking ring <NUM> includes a first limiting portion <NUM> and a second limiting portion <NUM> which are spaced apart from each other, the synchronizer ring <NUM> is movable between the first limiting portion <NUM> and the second limiting portion <NUM>, the first limiting portion <NUM> corresponds to the first position, and the second limiting portion <NUM> corresponds to the second position. In an embodiment, the first limiting portion <NUM> and the second limiting portion <NUM> may be protrusions formed on a surface of the braking ring <NUM>. The limiting protrusion <NUM> is fitted with the first limiting portion <NUM> and the second limiting portion <NUM>. In an embodiment, the synchronizer ring <NUM> has a limiting protrusion <NUM> protruding outwards in a radial direction thereof, and the limiting protrusion <NUM> is insertable between the first limiting portion <NUM> and the second limiting portion <NUM>.

When the synchronizer ring <NUM> rotates relative to the shutter base <NUM>, the limiting protrusion <NUM> may rotate between the first limiting portion <NUM> and the second limiting portion <NUM>, and the limiting protrusion <NUM> may abut against the first limiting portion <NUM>; in this case, the synchronizer ring <NUM> is located at the first position; when the limiting protrusion <NUM> abuts against the second limiting portion <NUM>, the synchronizer ring <NUM> is located at the second position. When the synchronizer ring <NUM> is located at the second position, the blade assembly <NUM> covers the exposure opening <NUM> and the exposure opening <NUM> is thus closed.

In an embodiment, the synchronizer ring <NUM> contacts the braking ring <NUM> and may drive the braking ring <NUM> to rotate relative to the shutter base <NUM>; that is, a part of the momentum of the synchronizer ring <NUM> may be transmitted to the braking ring <NUM>, such that the shutter mechanism may be braked and decelerated for the first time, thus reducing the impact force applied to the shutter mechanism when the exposure opening <NUM> is closed.

In addition, the closer a ratio of inertia of the braking ring <NUM> to the synchronizer ring <NUM> is to <NUM>, the better a braking effect is, but the larger the impact force applied to the shutter mechanism is; the closer the ratio of inertia of the braking ring <NUM> to the synchronizer ring <NUM> is to <NUM>, the smaller the impact force applied to the shutter mechanism is, but the poorer the braking and decelerating effect is. Therefore, in the present embodiment, the inertia of the braking ring <NUM> and the inertia of the synchronizer ring <NUM> may have a ratio ranging from <NUM> to <NUM>, and preferably, the ratio is set to <NUM>, such that the braking and decelerating effect can be better, and meanwhile, a small impact force is applied to the shutter mechanism, thus avoiding damage to the shutter mechanism.

In an embodiment, the braking ring <NUM> is provided with a plurality of limiting slots <NUM> along a circumferential direction thereof; that is, the limiting slots <NUM> are provided on the braking ring <NUM>; in order to improve the decelerating effect of the braking ring <NUM> on the synchronizer ring <NUM>, in the present embodiment, a plurality of limiting slots <NUM> are provided on the braking ring <NUM>, and the plurality of limiting slots <NUM> are arranged on the braking ring <NUM> at equal intervals along the circumferential direction of the braking ring <NUM>.

The limiting slot <NUM> may be an arc-shaped slot, and each limiting slot <NUM> extends in a direction coincident with the circumferential direction of the braking ring <NUM>. The limiting slot <NUM> is located at an edge of a side of the braking ring <NUM> towards the synchronizer ring <NUM>, a slot opening is provided at an end of the limiting slot <NUM> towards the synchronizer ring <NUM>, and the slot opening is fitted with the limiting protrusion <NUM> of the synchronizer ring <NUM>, such that the limiting protrusion <NUM> of the synchronizer ring <NUM> may be inserted into the limiting slot <NUM> through the slot opening, and therefore, the limiting protrusion <NUM> may move in the limiting slot <NUM> through the slot opening.

The first limiting portion <NUM> and the second limiting portion <NUM> of the braking ring <NUM> are formed on two end surfaces of the limiting slot <NUM> respectively, and when the driving device <NUM> drives the synchronizer ring <NUM> to rotate relative to the shutter base <NUM>, the limiting protrusion <NUM> abuts against a first end surface of the limiting slot <NUM>, and at this point, the synchronizer ring <NUM> is located at the first position, and the exposure opening <NUM> is in the open state; the limiting protrusion <NUM> rotates to abut against a second end surface of the limiting slot <NUM>, and at this point, the synchronizer ring <NUM> is located at the second position, and the exposure opening <NUM> is in the closed state. It may be understood that the limiting protrusions <NUM> of the synchronizer ring <NUM>, the limiting slots <NUM> of the braking ring <NUM>, the blade assemblies <NUM> and the driving devices <NUM> may have a same number; the driving slide slot <NUM>, the first driving shaft <NUM>, and the second driving shaft <NUM> of the synchronizer ring <NUM> may be provided on the limiting protrusion <NUM>.

Further, the braking ring <NUM> is rotatably provided on the shutter base <NUM>. In order to limit a moving range of the braking ring <NUM>, the braking ring <NUM> is further provided with a limiting hole <NUM>, the limiting hole <NUM> may be an arc-shaped hole, and an extending direction of the limiting hole <NUM> needs to be consistent with a rotating direction of the braking ring <NUM> (that is, the limiting hole <NUM> is provided along the circumferential direction of the braking ring <NUM>). The shutter base <NUM> is provided with a limiting block <NUM> inserted into the limiting hole <NUM>. In an embodiment, the limiting block <NUM> may be fixedly provided on a side surface facing the braking ring <NUM>, the limiting block <NUM> is fitted with the limiting hole <NUM>, the limiting block <NUM> may be inserted into the limiting hole <NUM>, the braking ring <NUM> may rotate relative to the limiting block <NUM>, and two end surfaces of the limiting hole <NUM> may abut against the limiting block <NUM> in different strokes, so as to limit the moving range of the braking ring <NUM>.

As shown in <FIG> and <FIG>, the braking member in the present embodiment further includes the friction member <NUM>, and the friction member <NUM> may generate a pressure by deformation to provide a frictional resistance, so as to decelerate the shutter mechanism; that is, the friction member <NUM> decelerates the shutter mechanism by friction.

Specifically, in an embodiment, the shutter base <NUM> is provided with a circumferential surface for mounting the braking ring <NUM>, and the circumferential surface is provided around the exposure opening <NUM> and is coaxial with the exposure opening <NUM>; a radius of the circumferential surface is greater than a radius of the exposure opening <NUM> to form a mounting space for the braking ring <NUM>. For example, the circumferential surface may be formed by the annular flange provided on the shutter base <NUM>; or, a radius of the annular mounting slot provided in the shutter base <NUM> and configured to mount the synchronizer ring <NUM> is increased, and the braking ring <NUM> and the synchronizer ring <NUM> may be mounted in the annular mounting slot together; that is, a slot wall of the enlarged annular mounting slot forms the circumferential surface to provide a mounting space for the braking ring <NUM> and the synchronizer ring <NUM>.

In an embodiment, the braking ring <NUM> may be provided between the synchronizer ring <NUM> and the circumferential surface of the shutter base <NUM>, and the friction member <NUM> may be provided between the circumferential surface of the shutter base <NUM> and the braking ring <NUM>. The friction member <NUM> may be an elastic friction plate, the friction member <NUM> may be provided on the braking ring <NUM> and rotate with the braking ring <NUM>, and the friction member <NUM> contacts the circumferential surface, such that when the braking ring <NUM> rotates relative to the shutter base <NUM>, the friction member <NUM> provides a frictional force for the braking ring <NUM> to decelerate the braking ring <NUM>. In an embodiment, the braking ring <NUM> rotates synchronously with the synchronizer ring <NUM>, and when the braking ring <NUM> decelerates, the synchronizer ring <NUM> correspondingly decelerates; that is, the shutter mechanism may be braked and decelerated for the second time with the friction member <NUM>, so as to further reduce the impact force applied to the shutter mechanism when the exposure opening <NUM> is closed.

In addition, the friction member <NUM> may be provided on the shutter base <NUM>; that is, the friction member <NUM> may be provided on the circumferential surface, and one side of the friction member <NUM> contacts the braking ring <NUM> and provides the frictional force for the braking ring <NUM>. The friction member <NUM> may be fixed on the circumferential surface, and a side of the friction member <NUM> facing the braking ring <NUM> is attached to a surface of the braking ring <NUM>; for example, the friction member <NUM> may be bonded to the circumferential surface, and one side of the friction member <NUM> is attached to the surface of the braking ring <NUM>.

Alternatively, the friction member <NUM> is detachably mounted on the circumferential surface; that is, the friction member <NUM> is detachably mounted on the shutter base <NUM>. Specifically, the friction member <NUM> includes a friction portion <NUM> and hook-shaped portions <NUM> located at two ends of the friction portion <NUM>, a mounting slot fitted with the hook-shaped portion <NUM> is provided at a position of the shutter base <NUM> close to the circumferential surface, the hook-shaped portion <NUM> may be snapped into the mounting slot, and the friction portion <NUM> faces the braking ring <NUM> and is attached to the braking ring <NUM>. For example, the friction member <NUM> may be an elastic friction plate, two ends of the friction plate are bent to form the hook-shaped portions <NUM>, and the hook-shaped portion <NUM> may have an L shape; correspondingly, the shutter base <NUM> is provided with an L-shaped mounting slot; that is, the friction plate is detachably mounted to the shutter base <NUM> by the hook-shaped portion <NUM>.

In an embodiment, the friction member <NUM> may be directly fixed to the braking ring <NUM>, the friction member <NUM> has one side mounted and attached to the braking ring <NUM>, and the other side thereof attached to the circumferential surface of the shutter base <NUM>, such that when the braking ring <NUM> rotates relative to the circumferential surface, the friction force generated between the friction member <NUM> and the circumferential surface may decelerate the braking ring <NUM>.

No matter how the friction member <NUM> is arranged between the braking ring <NUM> and the shutter base <NUM>, in the present embodiment, a plurality of friction members <NUM> may be provided between the braking ring <NUM> and the shutter base <NUM> as needed, the plural friction members <NUM> are provided at equal intervals along the circumferential surface, and the friction members <NUM> and the limiting slots <NUM> of the braking ring <NUM> are staggered, such that large friction displacement is provided for the braking ring <NUM>, so as to improve the decelerating effect of the friction member <NUM> on the braking ring <NUM>.

Further, in the present embodiment, the friction member <NUM> may be directly provided on the synchronizer ring <NUM>, and when the synchronizer ring <NUM> is located at the second position, the exposure opening <NUM> is in the closed state, and the friction member <NUM> provides a friction force for the synchronizer ring <NUM> to decelerate the synchronizer ring <NUM>, so as to reduce the momentum of the entire shutter mechanism, thereby reducing the impact force applied to the shutter mechanism when the exposure opening <NUM> is closed.

For example, the friction member <NUM> may be an elastic friction plate provided on a bottom surface of the synchronizer ring <NUM> facing the shutter base <NUM>, and a surface of the shutter base <NUM> close to the second position may be provided with a protrusion; when the synchronizer ring <NUM> is located at the second position, a surface of the protrusion may contact a surface of the friction member <NUM> to generate a frictional force, so as to decelerate the synchronizer ring <NUM>. Certainly, this solution may be used independently, or in conjunction with the above solution in which the friction member <NUM> is provided between the circumferential surface and the braking ring <NUM>, which is not limited in the present embodiment.

As shown in <FIG> and <FIG>, the braking member in the embodiment of the present invention further includes one or more biasing members <NUM>, the biasing members <NUM> decelerates the shutter mechanism by biasing displacement. In an embodiment, the biasing member <NUM> may be an elastic block, and the biasing member <NUM> is provided on the shutter base <NUM>, such that when the synchronizer ring <NUM> is located at the second position, the exposure opening <NUM> is closed, and the biasing member <NUM> is biased to displace (that is, deformed) and may absorb a part of the momentum of the shutter mechanism to decelerate the shutter mechanism.

Specifically, the biasing member <NUM> is mounted on the shutter base <NUM>, the shutter base <NUM> is provided with a positioning shaft configured to be inserted into the biasing member <NUM>, the biasing member <NUM> is provided with a mounting hole <NUM> fitted with the positioning shaft, and a positioning hole is in clearance fit with the positioning shaft; the biasing member <NUM> is fitted over the positioning shaft through the mounting hole <NUM>, and the biasing member <NUM> and the positioning shaft do not rotate relative to each other. It may be appreciated that the biasing member <NUM> includes an abutment surface, and the abutment surface may be arranged opposite to a component against which the abutment surface abuts, and ensure that the biasing member <NUM> abuts against the abutting component with which the biasing member is fitted; further, a shape of the abutment surface may be adapted to a shape of the component against which the abutment surface abuts.

As shown in <FIG>, a plurality of biasing members <NUM> may be provided on the second side of the shutter base <NUM>, and the plurality of biasing members <NUM> may be arranged at equal intervals in the circumferential direction of the shutter base <NUM>; specifically, the plurality of biasing members <NUM> are provided near the exposure opening <NUM>, and the plurality of biasing members <NUM> may be arranged along the circumferential direction of the exposure opening <NUM>. One biasing member <NUM> is provided corresponding to each blade assembly <NUM>, some biasing members <NUM> correspond to the first reinforcing sheets <NUM> on the first blades <NUM> of the forward blade assemblies, and some biasing members <NUM> correspond to the second reinforcing sheets <NUM> of the second blades <NUM> of the reverse blade assemblies.

When the synchronizer ring <NUM> is located at the second position, the first blade <NUM> and the second blade <NUM> in each blade assembly <NUM> cover the exposure opening <NUM>, such that the exposure opening <NUM> is in the closed state; at this point, the second reinforcing sheet <NUM> of the second blade <NUM> of the reverse blade assembly <NUM> abuts against the biasing member <NUM>, and the biasing member <NUM> is elastically deformed to absorb the momentum of the second blade <NUM>, thereby reducing the impact force of the reverse blade assembly. Similarly, the first reinforcing sheet <NUM> of the first blade <NUM> of the forward blade assembly abuts against the biasing member <NUM>, and the biasing member <NUM> is elastically deformed to absorb the momentum of the first blade <NUM>, thereby reducing the impact force of the forward blade assembly. In the present embodiment, the biasing member <NUM> abutting against each blade assembly <NUM> is provided on the second side of the shutter base <NUM>, and the biasing member <NUM> may absorb part of the momentum of the blade assembly <NUM> through deformation, so as to reduce the impact force applied to the entire shutter mechanism when the exposure opening <NUM> is closed.

In an embodiment, the biasing member <NUM> may alternatively abut against the synchronizer ring <NUM> or the braking ring <NUM> to decelerate the synchronizer ring <NUM> and the braking ring <NUM> respectively. Specifically, when the biasing member <NUM> abuts against the braking ring <NUM>, the biasing member <NUM> is provided on the shutter base <NUM> close to the second position, the biasing member <NUM> and the braking ring <NUM> are located on a same side, the biasing member <NUM> may be provided above the limiting slot <NUM> of the braking ring <NUM>, the first limiting portion <NUM> of the braking ring <NUM> may protrude from the surface of the braking ring <NUM>, and the biasing member <NUM> is located on a rotation path of the first limiting portion <NUM>. When the braking ring <NUM> rotates relative to the shutter base <NUM>, the first limiting portion <NUM> abuts against the biasing member <NUM> by properly setting the position of the biasing member <NUM> on the shutter base <NUM>, and the biasing member <NUM> may decelerate the braking ring <NUM>.

In an embodiment, when the biasing member <NUM> alternatively abuts against the synchronizer ring <NUM>, the biasing member <NUM> is provided at a position of the shutter base <NUM> close to the limiting protrusion <NUM>, the biasing member <NUM> has an extension portion extending towards a position above the synchronizer ring <NUM>, the synchronizer ring <NUM> is provided, at the limiting protrusion <NUM> thereof, with a protruding block opposite to the extension portion, the protruding block is located at an edge of the limiting protrusion <NUM> and provided near the first position of the braking ring <NUM>, the protruding block is perpendicularly provided on a surface of the limiting protrusion <NUM> and opposite to the extension portion, and the extension portion is located on a rotation path of the protruding block. When the synchronizer ring <NUM> rotates relative to the shutter base <NUM>, the protruding block abuts against the extension portion of the biasing member <NUM>, and the biasing member <NUM> may decelerate the synchronizer ring <NUM> when the synchronizer ring is located at the second position.

The braking and decelerating process of the shutter mechanism in the embodiment of the present invention is explained below with reference to the accompanying drawings.

As shown in <FIG>, when the shutter mechanism is at an initial position, the limiting protrusion <NUM> of the synchronizer ring <NUM> is located in the limiting slot <NUM> of the braking ring <NUM>, and the limiting protrusion <NUM> abuts against the first limiting portion <NUM> of the limiting slot <NUM>; at this point, each blade assembly <NUM> is arranged apart from the exposure opening <NUM>, and the exposure opening <NUM> is in the open state. In this state, the braking ring <NUM> located at the shutter base <NUM> is in a stationary state, and the friction member <NUM> is also in a non-working state; the biasing member <NUM> provided at the shutter base <NUM> does not abut against the blade assembly <NUM>, and the biasing member <NUM> is in a free state.

As the driving device <NUM> drives the synchronizer ring <NUM> to rotate relative to the shutter base <NUM>, the limiting protrusion <NUM> of the synchronizer ring <NUM> moves in the limiting slot <NUM>; as shown in <FIG>, the limiting protrusion <NUM> abuts against the second limiting portion <NUM> of the braking ring <NUM>; that is, the synchronizer ring <NUM> collides with the braking ring <NUM>, and the shutter mechanism may be braked and decelerated for the first time. A part of the momentum of the synchronizer ring <NUM> may be transferred to the braking ring <NUM>, such that the synchronizer ring <NUM> is decelerated to reduce the impact force applied to the synchronizer ring <NUM>. Each blade assembly <NUM> is driven to rotate towards the exposure opening <NUM> by the synchronizer ring <NUM> and covers a part of the exposure opening <NUM>, the friction member <NUM> enters a working state, and the biasing member <NUM> provided on the other side of the shutter base <NUM> does not abut against the blade assembly <NUM>, and is in the free state.

As shown in <FIG>, after the synchronizer ring <NUM> collides with the braking ring <NUM>, the braking ring <NUM> receives a part of the momentum of the synchronizer ring <NUM>, such that the braking ring <NUM> may rotate relative to the shutter base <NUM> and the shutter mechanism enters a second braking and decelerating process. The friction member <NUM> located between the braking ring <NUM> and the shutter base <NUM> provides the friction force for the braking ring <NUM>, such that the braking ring <NUM> is decelerated; the synchronizer ring <NUM> and the braking ring <NUM> may move together after the collision, thereby reducing a rotation speed of the synchronizer ring <NUM> so as to reduce the impact force applied to the synchronizer ring <NUM>. In this state, the blade assemblies <NUM> fully cover the exposure opening <NUM>, the exposure opening <NUM> is in the closed state, and the biasing member <NUM> provided on the shutter base <NUM> and the blade assembly <NUM> enter an abutting state.

As shown in <FIG>, as the synchronizer ring <NUM> continuously rotates, the blade assembly <NUM> continuously rotates towards the exposure opening <NUM>, the blade assembly <NUM> may abut against the biasing member <NUM> and deform the biasing member <NUM>, and the biasing member <NUM> absorbs the momentum of the blade assembly <NUM> and is elastically deformed, which may reduce a rotation speed of the blade assembly <NUM> so as to reduce the impact force applied to the blade assembly <NUM>, thereby reducing the impact force applied to the shutter mechanism.

An embodiment of the present invention further provides a photographing apparatus including the above-mentioned shutter; when the shutter mechanism in the shutter closes the exposure opening <NUM>, a first deceleration may be performed by the braking ring <NUM>, a second deceleration may be performed by the friction member <NUM>, and a third deceleration may be performed by the biasing member <NUM>, thus effectively reducing the impact force applied to the shutter mechanism when the exposure opening <NUM> is closed, avoiding the damage to the shutter mechanism, and improving a reliability of the shutter mechanism.

Claim 1:
A shutter, the shutter comprises:
a shutter base (<NUM>) provided with an exposure opening (<NUM>);
a shutter mechanism including a blade assembly (<NUM>) and a synchronizer ring (<NUM>) for driving the blade assembly (<NUM>), the synchronizer ring (<NUM>) being movable between a first position and a second position, and the exposure opening (<NUM>) being open when the synchronizer ring (<NUM>) is in the first position and closed when the synchronizer ring (<NUM>) is in the second position; and
a braking member for decelerating the shutter mechanism,
wherein the braking member includes a braking ring (<NUM>), the braking ring (<NUM>) being configured to decelerate the shutter mechanism by limiting a position of the synchronizer ring (<NUM>),
characterized in that
the braking ring (<NUM>) is provided with a plurality of limiting slots (<NUM>) along the circumferential direction thereof,
and wherein the plurality of limiting slots (<NUM>) are distributed in the braking ring (<NUM>) at equal intervals.