JP2019204038A - Shutter device and imaging apparatus - Google Patents

Abstract

To provide a shutter device capable of properly braking the travel of a blade group.SOLUTION: A shutter device (200) includes a shutter base plate (1) in which an opening (1a) is formed, a light shielding member (40) which is reciprocatable between a closing state for closing the opening and an opening state for opening the opening, a first driving member (11) which is connected to the light shielding member and rotated with respect to the shutter base plate, a second driving member (15) which drives the first driving member, a locking member (21) which locks the second driving member and can switch a first state where the second driving member is in contact with the first driving member and a second state where the second driving member is away from the first driving member, and a brake member (25) which can brake the reciprocal operation of the second driving member. The locking member is operated to charge the brake member.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a shutter device and an imaging device including the shutter device.

  Patent Document 1 discloses a shutter device that includes a first drive member (blade lever) that works in conjunction with a blade group and a second drive member (drive lever) that receives the bias of a drive spring. Patent Document 2 can switch between normally open (opening in the standby state) and normally closed (opening in the standby state), and includes a first drive member and a second drive member. A focal plane shutter is disclosed.

JP 2012-118346 A JP 2016-177308 A

  In a shutter device having two drive units as disclosed in Patent Document 1 and Patent Document 2, it is required to increase the traveling speed of the blade group in order to improve performance. When the traveling speed of the blade group is increased, the kinetic energy is increased, so that the blade group is likely to bounce and wear is increased. Therefore, it is necessary to reduce the impact of the blade group by providing a brake mechanism.

  However, in the configurations of Patent Document 1 and Patent Document 2, it is difficult to provide a brake mechanism (braking mechanism) of a charging method via a drive lever, and it is difficult to appropriately brake the traveling of the blade group.

  Therefore, an object of the present invention is to make it possible to appropriately brake the traveling of the blade group.

  A shutter device according to an aspect of the present invention includes a shutter base plate in which an opening is formed, a light shielding member that can reciprocate between a closed state in which the opening is closed and an open state in which the opening is opened, and the light shielding member. A second driving member that rotates with respect to the shutter base plate, a second driving member that drives the first driving member, and a second driving member that locks the second driving member. A locking member capable of switching between a first state in contact with the first driving member and a second state in which the second driving member is separated from the first driving member; and the second driving A brake member capable of braking the reciprocation of the member, and the locking member operates to charge the brake member.

  A shutter device according to another aspect of the present invention includes a shutter base plate in which an opening is formed, a light shielding member that can reciprocate between a closed state in which the opening is closed and an open state in which the opening is opened, and the light shielding member. A first drive member that is connected and rotates with respect to the shutter base plate, a second drive member that drives the first drive member, and the second drive member that engages the second drive member. A locking member capable of switching between a first state where the member is in contact with the first driving member and a second state where the second driving member is separated from the first driving member; A brake member capable of braking the reciprocating motion of the drive member, the locking member having a cam, and the brake member being operable by the cam.

  An imaging device as another aspect of the present invention includes the shutter device and an imaging device that photoelectrically converts an optical image formed through an imaging optical system.

  Other objects and features of the invention are described in the following embodiments.

  According to the present invention, it is possible to appropriately brake the traveling of the blade group.

It is a figure which shows the relationship between the brake lever in this embodiment, a blade | wing lever, and a 1st cam gear. It is a disassembled perspective view of the focal plane shutter in this embodiment. It is a block diagram of the drive lever and blade lever in this embodiment. It is a perspective view of the 1st cam gear and the 2nd cam gear in this embodiment. It is a figure which shows the operation | movement timing of each component of the focal plane shutter in this embodiment. It is a figure which shows the standby state before a release in this embodiment. It is a figure which shows the blade lever latch release state in this embodiment. It is a figure which shows the mirror up state in this embodiment. It is a figure which shows the brake charge completion state in this embodiment. It is a figure which shows the set cancellation | release state in this embodiment. It is a figure which shows the blade travel completion state in this embodiment. It is a figure which shows the blade lever latching state in this embodiment. It is sectional drawing of the imaging device in this embodiment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  First, with reference to FIG. 13, the configuration of the imaging apparatus in the present embodiment will be described. FIG. 13 is a cross-sectional view of the imaging apparatus 100. The imaging apparatus 100 includes a camera body (digital single-lens reflex camera body) 101 and an interchangeable lens (lens apparatus) 201 that can be attached to and detached from the camera body 101. However, the present invention is not limited to this, and can also be applied to an imaging apparatus in which a camera body and a lens device are integrally configured.

  An interchangeable lens 201 that can be attached to and detached from the camera body 101 is fixed by a mount portion 102 of the camera body 101 and a mount portion 202 of the interchangeable lens 201. When the interchangeable lens 201 is attached to the camera body 101, the contact portion 103 of the camera body 101 and the contact portion 203 of the interchangeable lens 201 come into contact with each other. As a result, the camera body 101 and the interchangeable lens 201 are electrically connected, and the camera body 101 detects that the interchangeable lens 201 is attached. Further, power supply from the camera body 101 to the interchangeable lens 201 and communication for controlling the interchangeable lens 201 are performed via the contact portions 103 and 203.

  The light beam that has passed through the imaging lens (imaging optical system) 204 of the interchangeable lens 201 enters the main mirror 6 of the camera body 101. The main mirror 6 is a half mirror. The light beam reflected by the main mirror 6 is guided to the finder. The light beam that has passed through the main mirror 6 is reflected downward by the sub mirror 105 and guided to the focus detection unit 106. The focus detection unit 106 detects the defocus amount of the imaging lens 204 and calculates a lens driving amount for moving the imaging lens 204 so that the imaging lens 204 is in a focused state. The lens driving amount calculated by the focus detection unit 106 is transmitted to the interchangeable lens 201 via the contact portions 103 and 203. The interchangeable lens 201 controls a motor (not shown) based on the lens driving amount received from the camera body 101, and moves the focus lens, which is a part of the imaging lens 204, in the direction along the optical axis OA (optical axis direction). Move it to adjust the focus.

  The main mirror 6 is fixed to the main mirror holding frame 107, and is pivotally supported by the rotation shaft portion 6b so as to be rotatable. The sub mirror 105 is fixed to the sub mirror holding frame 109. The sub mirror holding frame 109 is pivotally supported with respect to the main mirror holding frame 107 by a hinge shaft (not shown). The light beam guided to the finder by the main mirror 6 forms a subject image on the focus plate 110. The user can observe the subject image on the focusing screen 110 via the pentaprism 111 and the eyepiece 112.

  A focal plane shutter (shutter device) is disposed behind the sub mirror 105, and a blade group (shutter blade, light shielding member) 40 of the focal plane shutter is normally closed. An optical low-pass filter 114 is disposed behind the focal plane shutter. An image sensor 116 and a cover member 117 that protects the image sensor 116 are disposed behind the optical low-pass filter 114. The image sensor 116 is held by an image sensor holder 115 fixed to the housing by screws (not shown). The imaging element 116 is an imaging sensor such as a CMOS sensor or a CCD sensor, and photoelectrically converts an optical image (subject image) formed via the imaging lens 204 and outputs image data.

  The rubber member 118 holds the optical low-pass filter 114 and seals the space between the optical low-pass filter 114 and the image sensor 116. At the time of shooting, the light beam that has passed through the optical low-pass filter 114 enters the image sensor 116.

  Next, the configuration of the focal plane shutter (shutter device) in the present embodiment will be described with reference to FIG. 2A is an exploded perspective view of the focal plane shutter 200 as viewed from the front, and FIG. 2B is an exploded perspective view of the focal plane shutter 200 as viewed from the back.

  In FIG. 2A, reference numeral 1 denotes a shutter base plate provided with an opening 1a at the center. A drive lever (first drive member) 11, a blade lever (second drive member) 15, and a ratchet 16 are rotatably supported on the shaft 1 b of the shutter base plate 1. A first cam gear (locking member) 21 is rotatably supported on the shaft 1 c of the shutter base plate 1. A second cam gear 22 is rotatably supported on the shaft 1 d of the shutter base plate 1. An auxiliary base plate 31 is attached to the tip of the shafts 1b, 1c, 1d of the shutter base plate 1. A mirror lever 36 is rotatably supported on the shaft 31 a of the auxiliary base plate 31. A screw 37 is fixed to the tip of the shaft 31 a of the auxiliary ground plate 31 so that the mirror lever 36 does not fall off from the shaft 31 a of the auxiliary ground plate 31. The auxiliary base plate 31 has a ratchet claw 31b.

  The mirror lever 36 is provided with a cam follower 36a. The cam follower 36a is in contact with a first cam 22a of the second cam gear 22 described later. The mirror lever 36 is provided with a contact portion 36b. The contact portion 36b is in contact with the main mirror drive pin (shaft portion) 6a. A mirror lever drive spring 39 is hung on the mirror lever 36 and is urged clockwise in FIG.

  The main mirror 6 reciprocates around the rotation shaft 6b. The main mirror 6 also guides the imaging light flux in the direction of the imaging element 116 and the down position held at an angle of 45 ° with respect to the imaging optical axis (optical axis OA) in order to guide the imaging light beam in the direction of the pentaprism 111. An up position held at a position retracted from the imaging light beam can be taken. A main mirror blade drive spring 7 is hung on the main mirror drive pin (shaft portion) 6a and is urged counterclockwise in FIG.

  A photo interrupter 32 that detects the rotational phase (position) of the blade lever 15 is attached to the auxiliary base plate 31. A yoke 33 and a coil 34 are fixed to the auxiliary ground plate 31 with screws 35. The yoke 33 and the coil 34 constitute electromagnetic means, and a magnetic force is generated in the yoke 33 by applying a voltage to the coil 34.

  The ratchet 16 is configured such that the ratchet pawl 31b is caught so as to be prevented from rotating counterclockwise in FIG. The FPC (flexible printed circuit board) 38 is connected to the coil 34 and the photo interrupter 32 at a fixing portion 38 a fixed to the auxiliary ground plane 31. Further, the FPC 38 is provided with a phase pattern portion 38c for detecting a phase (position) of a phase contact piece 23 provided in a first cam gear 21 described later, in a fixing portion 38b fixed to the shutter base plate 1. . A buffer member 3 made of a material such as a half-moon-shaped rubber is fixed to the upper portion of the arc-shaped hole 1 e of the shutter base plate 1.

  In FIG. 2B, the cover plate 2 is fixed to the back side of the shutter base plate 1. In the center of the cover plate 2, an opening 2a is provided at a position substantially coincident with the opening 1a of the shutter base plate 1. The two openings 1a and 2a restrict the light beam passing through the focal plane shutter 200. ing.

  Between the shutter base plate 1 and the cover plate 2, a blade chamber in which a blade group (shutter blade, light shielding member) 40 is disposed is formed. The blade group 40 includes a first blade (first blade) 41, a second blade (second blade) 42, a main arm 43, and a sub arm 44. The first blade 41 and the second blade 42 are made of polyethylene terephthalate containing black paint, and are pivotally supported by a main arm 43 and a sub arm 44 by a pin 45 to form a parallel link as is well known. To do. The main arm 43 is rotatably supported on the shaft 1f and the sub arm 44 is rotatably supported on the shaft 1g. The main arm 43 is provided with a hole 43a for engaging with a drive pin 15a of the blade lever 15 described later. A blade return spring 46 is hung on the sub-arm 44 in the clockwise direction in FIG.

  The blade cushioning member 4 is made of a rubber material such as chloroprene rubber, butyl rubber, polyurethane rubber, or silicon rubber, or a material that absorbs an impact such as an elastomer. The blade contact member 5 is made of a material having higher wear resistance than the blade buffer member 4 such as metal or plastic. The blade contact member 5 is fixed to the blade cushioning member 4, and prevents the blade cushioning member 4 from being worn by collision with the second blade 42. The blade cushioning member 4 is fixed to a rectangular mounting portion 1 h provided on the shutter base plate 1.

  Next, the configuration of the drive lever 11 and the blade lever 15 of the focal plane shutter 200 will be described with reference to FIG. FIG. 3 is a configuration diagram of the drive lever 11 and the blade lever 15. 3A and 3C are plan views of the drive lever 11 and the blade lever 15. FIG. 3B is a cross-sectional view of the armature holding portion 11a of the drive lever 11, and shows a cross section taken along the line AA of FIG. FIG. 3D is a cross-sectional view showing the relationship between the drive lever 11 and the blade lever 15 and corresponds to the B cross section of FIG.

  The drive lever 11 is provided with an armature holding portion 11a. An armature shaft 12a integrally attached to the armature 12 is loosely inserted into the through hole 11b formed in the armature holding portion 11a. At one end of the armature shaft 12a, a flange 12b having an outer diameter larger than the inner diameter of the through hole 11b is provided. Between the armature 12 and the armature holding portion 11a, an armature spring 17 that is a compression spring is disposed around the armature shaft 12a. The armature spring 17 applies a biasing force in a direction that separates the armature 12 from the armature holding portion 11a. A hemispherical protrusion 11c is provided at a position facing the flange 12b of the armature holding portion 11a.

  A roller 13 is rotatably supported on the roller holding portion 11 d of the drive lever 11. The roller 13 is in contact with a second cam surface 22c of the second cam gear 22 described later as a driven portion of the drive lever 11. The drive lever 11 is provided with a protrusion 11e, and abuts on a protrusion 15b of a blade lever 15 described later.

  The blade lever 15 is provided with a protruding drive pin 15a. The drive pin 15 a passes through the arc-shaped hole 1 e of the shutter base plate 1, engages with the hole 43 a of the main arm 43 on the back side of the shutter base plate 1, and transmits the rotation of the blade lever 15 to the main arm 43. The blade lever 15 is provided with a cam follower 15e. The cam follower 15e is in contact with a cam surface 21b of the first cam gear 21 described later. The blade lever 15 is provided with two light shielding members 15c. The light shielding member 15 c shields the photo interrupter 32 to detect the rotational phase (position) of the blade lever 15.

  The blade lever 15 is provided with a guide portion 15 d of the roller 13. The guide portion 15d prevents the roller 13 from detaching from the roller holding portion 11d because the roller holding portion 11d is in a position facing the roller 13 in the range in which the drive lever 11 and the blade lever 15 operate. The guide portion 15 d is in a positional relationship parallel to the rotation direction of the drive lever 11. For this reason, the guide portion 15 d functions as a rail of the roller 13 when the blade lever 15 rotates relative to the drive lever 11.

  As shown in FIG. 3 (d), the blade lever 15 is rotatably supported by the shaft portion 11 f of the drive lever 11. The drive lever 11 is rotatably supported on the shaft 1 b of the shutter base plate 1. For this reason, the drive lever 11 and the blade lever 15 are configured to be rotatable with respect to the shaft 1 b of the shutter base plate 1.

  A blade drive spring 14 that is a torsion spring is disposed between the ratchet 16 and the drive lever 11. The movable end 14 b of the blade drive spring 14 is hung on the drive lever 11. The blade drive spring 14 applies a biasing force in the counterclockwise direction in FIG. 2A to the drive lever 11. On the other hand, the fixed end 14 a of the blade drive spring 14 is engaged with the ratchet 16. The free length of the blade drive spring 14 is set longer than the distance between the drive lever 11 and the ratchet 16. For this reason, the blade drive spring 14 functions as a compression spring and biases the drive lever 11 toward the shutter base plate 1.

  The roller holding portion 11d of the drive lever 11 is sandwiched between the blade levers 15 in the depth direction of the paper surface of FIG. On the other hand, the roller holding portion 11d is not sandwiched in the depth direction of the paper surface of FIG. As described above, the blade lever 15 and the drive lever 11 have a phase in which the roller holding portion 11 d is sandwiched in the rotation axis direction of the blade lever 15. At the time of assembly, the blade lever 15 and the drive lever 11 are combined in the state of FIG. 3A, and one of them is rotated to the state of FIG. 3C, so that the blade lever 15, the drive lever 11, and The roller 13 can be handled as a unit.

  In addition, the movable range of the drive lever 11 in the depth direction on the paper surface when the drive lever 11 is sandwiched between the blade levers 15 is set to be equal to or less than the thickness of the roller 13. For this reason, even when the drive lever 11 is loosely moved to any one, the roller 13 is unlikely to fall off the roller holding portion 11d. That is, it is possible to incorporate the roller 13 into the shutter base plate 1 while preventing the roller 13 from being detached from the roller holding portion 11d.

  In the present embodiment, the rotation of the blade lever 15 based on the biasing force of the blade drive spring 14 is defined as main travel, and the rotation of the blade lever 15 based on the biasing force of the blade return spring 46 is defined as return travel.

  Next, the configuration of the first cam gear 21 and the second cam gear 22 will be described with reference to FIG. FIG. 4 is a perspective view of the first cam gear 21 and the second cam gear 22. The first cam gear 21 is provided with a gear 21a and a cam 21b. The gear 21a is engaged with a gear 22b of a second cam gear 22 to be described later, and the rotation is transmitted. The cam 21b comes into contact with the cam follower 15e of the blade lever 15 to prevent the rotation of the blade lever 15 (FIG. 4A), and the cam 21b retreats from the rotation trajectory of the cam follower 15e of the blade lever 15. 15 is controlled to be rotatable (FIG. 4B). A phase contact piece 23 is provided on the lower surface of the cam portion 21 b and contacts the pattern portion 38 c of the FPC 38 to detect the rotational phase of the first cam gear 21.

  The second cam gear 22 is provided with a first cam 22a, a gear 22b, and a second cam 22c. The gear 22b meshes with a transmission gear (not shown), and the rotation of a motor (not shown) is transmitted. Further, the number of teeth of the gear 22b and the gear 21a is set to the same number, and the two gears 21a and 22b are meshed so as to have a predetermined phase. For this reason, the first cam gear 21 and the second cam gear 22 rotate at a predetermined phase and at the same rotational speed. The first cam 22a contacts the cam follower 36a of the mirror lever 36, and rotates the mirror lever 36 to the up position and the down position as will be described later. The second cam 22c comes into contact with the roller 13 provided on the drive lever 11, and performs the charge and release operations of the drive lever 11 as described later.

  Next, the brake mechanism (the brake lever 25, the blade lever 15, and the first cam gear 21) will be described with reference to FIG. FIG. 1 is a diagram illustrating a relationship among the brake lever 25, the blade lever 15, and the first cam gear 21. Fig.1 (a) is an enlarged view of a brake mechanism, FIG.1 (b) has shown the AA cross section in Fig.1 (a).

  The brake lever (braking member) 25 is rotatably attached to the brake shaft 1i, is sandwiched by the brake seat 26, and is pressed by the leaf spring 28 via the brake fixing plate 27. The brake collar 30 is used for adjusting the amount of collapse of the leaf spring 28. During the main travel of the blade lever 15, the main travel lever portion 25 a of the brake lever 25 abuts on the drive pin 15 a of the blade lever 15 and transmits the braking force to the drive lever 11 and the blade group 40. On the other hand, at the time of return travel, the return travel lever portion 25 b of the brake lever 25 contacts the drive pin 15 a of the blade lever 15 and transmits the braking force to the blade group 40.

  At this time, by changing the distance from the rotation center of the brake lever 25 to each contact point, the braking force generated by the return travel lever portion 25b is made smaller than the braking force generated by the main travel lever 25a. Yes. This is because the return travel energy is much smaller than the main travel energy. Further, the brake lever 25 returns to the standby position at which braking is started during the return travel by the main travel. On the other hand, the brake lever 25 cannot return to the standby position where the brake is started during the main traveling because the energy is small only by the returning traveling.

  Therefore, the torque transmission from the motor (not shown) causes the first cam gear 21 to rotate (charge) the brake lever 25 to the standby position for the main travel via the brake charge cam 21c. The brake lever 25 is provided with a cam follower 25c that operates at this time (can contact the brake charge cam 21c). As described above, the present brake configuration realizes a configuration in which the drive member is returned to the brake start position after brake braking even in a configuration in which the drive member is divided into two (configuration in which the drive lever 11 and the blade lever 15 are divided). ing. Since the first cam gear 21 determines the return travel timing of the blade group 40, charging the brake lever 25 using the first cam gear 21 is less time consuming and reasonable. . In addition, because it is configured to be able to brake both the main travel and the return travel, the bounce during the main travel and the bounce during the return travel are appropriately suppressed, reducing the time required for one sequence. can do.

  Next, the operation of each component of the focal plane shutter 200 will be described with reference to FIGS. FIG. 5 is a diagram showing the operation timing of each component of the focal plane shutter 200. (1) to (11) in FIG. 5 respectively correspond to states (1) to (11) described later.

(1) Standby state before release FIG. 6 is a diagram illustrating a standby state before release. 6A is a view of the focal plane shutter 200 seen from the front side, FIG. 6B is a view seen from the back side, and FIG. 6C is an enlarged view of the main part in FIG. Each is shown.

  The first cam gear 21 and the second cam gear 22 are stopped at the phase (position) shown in FIG. The roller 13 provided on the drive lever 11 contacts the cam top portion 22d of the second cam 22c of the second cam gear 22, and the drive lever 11 rotates counterclockwise in FIG. 6A to charge the blade drive spring 14. Is in a state. The armature holding portion 11a of the drive lever 11 compresses the armature spring 17, the flange portion 12b of the armature 12 and the projection portion 11c of the drive lever are separated from each other, and the armature 12 is in contact with the yoke 33 (overcharge state) )It is in.

  The cam follower 15e of the blade lever 15 contacts the cam top portion 21c of the cam 21b of the first cam gear 21, and locks the blade lever 15 in a left-turned state in FIG. The drive pin 15 a of the blade lever 15 engages with the hole 43 a of the main arm 43 and holds the blade group 40 in the deployed state against the urging force of the blade return spring 46. Accordingly, the opening portions of the shutter (openings 1a and 2a) are covered with the expanded blade group 40 (the first blade 41 and the second blade 42).

  In the mirror lever 36, the cam follower 36 a comes into contact with the cam top portion 22 e of the first cam 22 a of the second cam gear 22 by the biasing force of the mirror lever drive spring 39, and is held in the down position. The main mirror 6 is biased in the down direction by the main mirror blade drive spring 7 and is held in the down position in contact with a stopper (not shown). At this time, there is a gap (space) between the main mirror driving pin (shaft portion) 6a and the contact portion 36b of the mirror lever 36. For this reason, even if an error occurs in the position of the mirror lever 36, the position of the main mirror 6 is held at the correct position by a stopper (not shown). The brake lever 25 is in a braking start position (standby state before return travel) during return travel in preparation for return travel.

  When the release operation starts, the coil 34 is energized to generate a magnetic force in the yoke 33 and bring the yoke 33 and the armature 12 into an attracted state. At the same time, the motor (not shown) is energized, the first cam gear 21 and the second cam gear 22 are rotated, and the blade lever lock is released.

(2) Blade Lever Lock Release State FIG. 7 is a view showing a blade lever lock release state (blade lever lock release state). 7A is a view of the focal plane shutter 200 as viewed from the front side, FIG. 7B is a view as viewed from the back side, and FIG. 7C is an enlarged view of the main part in FIG. 7B. Each is shown. Here, the part that has changed from the previously described state will be described, and the description of the part that has not changed will be omitted.

  The first cam gear 21 is in the phase shown in FIG. The cam 21b is retracted from the rotation locus of the cam follower 15e of the blade lever 15, and the blade lever 15 is released from the locking state and can rotate with respect to the shaft 1b.

  The main arm 43 is biased clockwise in FIG. 7B by the blade return spring 46, and the hole 43a of the main arm 43 pushes the drive pin 15a of the blade lever 15 to rotate the blade lever 15 clockwise. Let The blade group 40 travels downward and is superimposed. When reaching the final stage of travel, the blade drive pin 15 a comes into contact with the return travel lever portion 25 b of the brake lever 25. Then, the rotation continues while receiving the braking force from the brake lever 25, and stops in a state where the first blade 41 and the second blade 42 are in contact with the blade contact member 5 of the blade buffer member 4. At this time, a gap (space) exists between the protrusion 11 e of the drive lever 11 and the protrusion 15 b of the blade lever 15.

  Since the blade return spring 46 is biased in a direction opposite to the biasing direction of the blade driving spring 14, the motor current when charging the drive lever 11 against the biasing force of the blade driving spring 14 is not increased. Thus, the main arm 43 is urged with a weak urging force. Therefore, the braking force urged at the end of traveling during return traveling is weaker than the braking force during actual traveling. In response to braking from the brake 25, the bounce of the blade group 40 quickly converges, and the shutter openings (openings 1a and 2a) are opened. At this time, the second cam gear 22 rotates, but the cam follower 36a of the mirror lever 36 comes into contact with the cam top portion 22e of the first cam 22a of the second cam gear 22 and stops at a phase held at the down position. .

  The main mirror 6 is in the down position while the blade group 40 travels from the unfolded state to the superimposed state, and the light beam that has passed through the imaging lens 204 is guided to the pentaprism 111 by the main mirror 6 and irradiated onto the blade group 40. There is no. Further, the motor is energized, and the first cam gear 21 and the second cam gear 22 are rotated to enter the mirror lever locking release state (mirror lever lock release state).

(3) Mirror lever locking release state With the rotation of the second cam gear 22, the cam follower 36a of the mirror lever 36 moves away from the cam surface of the first cam 22a of the second cam gear 22, and the mirror lever drive spring 39 By the urging force, it rotates clockwise in FIG. After the mirror lever 36 rotates by a predetermined amount, the contact portion 36b of the mirror lever 36 contacts the main mirror drive pin (shaft portion) 6a, and the main mirror 6 rotates clockwise in FIG. Further, when the motor is energized and the first cam gear 21 and the second cam gear 22 are rotated, a mirror-up state (mirror-up live view state) is established.

(4) Mirror Up State FIG. 8 is a diagram showing a mirror up state. FIG. 8A shows a view of the focal plane shutter 200 viewed from the front side, and FIG. 8B shows a view seen from the back side.

  The main mirror 6 comes into contact with a stopper (not shown) and stops after bouncing for a predetermined time. Accordingly, the mirror lever 36 stops at the up position shown in FIG. The roller 13 pivotally supported by the drive lever 11 contacts the cam top portion 22d of the second cam 22c of the second cam gear 22, and the armature 12 and the yoke 33 are in the overcharge state described above.

  A gap (space) exists between the protrusion 11e of the drive lever 11 and the protrusion 15b of the blade lever 15 from the state of FIG. 7C. The blade group 40 (the first blade 41 and the second blade 42) travels downward and is superimposed, and the blade group 40 is in contact with the blade contact member 5 of the blade cushioning member 4. At this time, the main mirror 6 is in the up position, the blade group 40 travels downward and is superimposed, and both the opening 1a of the shutter base plate 1 and the opening 2a of the cover plate 2 are open. When the motor (not shown) is stopped in this state, the light flux from the imaging lens 204 reaches the imaging element 116, and a so-called live view state is set. In the live view state, the blade group 40 does not travel even when the coil 34 is turned off.

(5) Brake Charge Completion State FIG. 9 is a diagram showing a brake charge completion state. FIG. 9A shows a view of the focal plane shutter 200 viewed from the front side, and FIG. 9B shows a view seen from the back side. The brake charge completion state is a state in which the brake lever 25 is pushed by the brake charge cam 21c of the first cam gear 21 after the brake lever 25 is operated in the return travel, and the brake lever 25 is rotated to a position where the brake starts to be applied during the main travel. . Further, the motor is energized, the first cam gear 21 and the second cam gear 22 are rotated, and then the motor is stopped in the set release state.

(6) Set Release State FIG. 10 is a view showing a set release state of the drive lever 11. 10A is a view of the focal plane shutter 200 seen from the front side, FIG. 10B is a view seen from the back side, and FIGS. 10C and 10D are main portions in FIG. 10B. Are respectively enlarged views.

  The roller 13 provided on the drive lever 11 is separated from the cam top portion 22d of the second cam 22c of the second cam gear 22, and the drive lever 11 is rotated clockwise in FIG. 10A by the urging force of the blade drive spring 14. Rotate to. The armature 12 is attracted to the yoke 33 due to the magnetic force generated in the yoke 33 by energization of the coil 34. The drive lever 11 is held by contact between the flange 12b of the armature 12 and the protrusion 11c of the drive lever.

  As the drive lever 11 rotates, the protrusion 11 e of the drive lever 11 abuts on the protrusion 15 b of the blade lever 15 as shown in FIG. Further, the blade lever 15 is rotated counterclockwise in FIG. As the blade lever 15 rotates, the blade group 40 (the first blade 41 and the second blade 42) rises, and the space between the blade group 40 and the blade contact member 5 of the blade buffer member 4 is as shown in FIG. There is a gap (space) as shown. At this time, the blade group 40 is superposed, and both the opening 1a of the shutter base plate 1 and the opening 2a of the cover plate 2 are open.

(7) Blade Traveling State Reset scanning (electronic front curtain traveling) of the pixels of the image sensor 116 is performed, and photographing exposure is performed. After starting the electronic front curtain travel, the coil 34 is deenergized after a time interval corresponding to the set shutter speed. When the coil 34 is de-energized, the magnetic force generated in the yoke 33 is lost, and the adsorption of the armature 12 and the yoke 33 is released.

  The drive lever 11 is rotated clockwise in FIG. 10A by the urging force of the blade drive spring 14. Then, in a state where the projecting portion 11 e of the drive lever 11 is in contact with the projecting portion 15 b of the blade lever 15, both rotate integrally. The drive pin 15 a of the blade lever 15 engages with the hole 43 a of the main arm 43, rotates the main arm 43 counterclockwise in FIG. 10B, and the blade group 40 resists the urging force of the blade return spring 46. And drive upward. When the end of travel is reached, the blade drive pin 15a comes into contact with the main travel lever portion 25a. Then, the rotation continues while receiving the braking force from the brake lever, and the blade driving pin 15a comes into contact with the buffer member 3 above the arcuate hole 1e of the shutter base plate 1 and stops.

(8) Blade Travel Completion State FIG. 11 is a diagram showing a blade travel completion state. FIG. 11A shows the focal plane shutter 200 as viewed from the front side, and FIG. 11B shows the view as viewed from the back side.

  At this time, the blade lever 15 is biased counterclockwise in FIG. 11A through the main arm 43 by the biasing force of the blade return spring 46, and the protrusion 11 e of the drive lever 11 is the protrusion of the blade lever 15. 15b is in contact. The first cam gear 21 is in the position shown in FIG. 11, the cam 21b does not contact the cam follower 15e of the blade lever 15, and the blade lever 15 is in a state of being rotatable with respect to the shaft 1b.

  A photo interrupter 32 provided on the auxiliary base plate 31 detects that the drive lever 11 is in the blade travel completion state. A predetermined time after the photo interrupter 32 detects that the drive lever 11 is in the blade travel completion state, the motor is energized to rotate the first cam gear 21 and the second cam gear 22.

(9) Mirror lever charge state As the first cam gear 21 rotates, the first cam 22a of the second cam gear 22 pushes the cam follower 36a of the mirror lever 36 and resists the biasing force of the mirror lever drive spring 39. Then, it rotates counterclockwise in FIG.

  The main mirror 6 is urged in the down direction by the main mirror blade drive spring 7, and the main mirror drive pin (shaft portion) 6a and the contact portion 36b of the mirror lever 36 are in contact with each other in FIG. Rotate counterclockwise and descend. When the motor is further energized and the first cam gear 21 and the second cam gear 22 are rotated, the mirror lever 36 is in a charge completion state (mirror lever charge completion state).

  The main mirror 6 rotates counterclockwise in FIG. 11A and descends, and comes into contact with a stopper (not shown) and stops. The cam follower 36a of the mirror lever 36 reaches the cam top portion 22e of the first cam 22a of the second cam gear 22, and the mirror lever 36 is held in the down position. Further, the motor is energized, and the first cam gear 21 and the second cam gear 22 rotate to enter the blade lever locked state (blade lever locked state).

(10) Blade Lever Locked State FIG. 12 is a diagram showing a blade lever locked state. FIG. 12A shows a view of the focal plane shutter 200 viewed from the front side, and FIG. 12B shows a view seen from the back side. The blade lever locking state is a state where the cam 21b of the first cam gear 21 enters the rotation locus of the cam follower 15e of the blade lever 15 and is in a position where the rotation of the blade lever 15 can be locked. When the motor is further energized from this state, the second cam 22c of the second cam gear 22 pushes the roller 13 provided on the drive lever 11, and the drive lever 11 resists the urging force of the blade drive spring 14 as shown in FIG. In (a), it rotates counterclockwise.

  When the blade lever 15 is rotated by a predetermined amount counterclockwise in FIG. 12A through the main arm 43 by the biasing force of the blade return spring 46, the cam follower 15e is moved to the cam top portion of the cam 21b of the first cam gear 21. Contact with 21c and stop rotating. At this time, the blade group 40 is lowered with the rotation of the blade lever, but is in a deployed state, and both the opening 1a of the shutter base plate 1 and the opening 2a of the cover plate 2 are shielded. Further, the motor is energized to rotate the first cam gear 21 and the second cam gear 22.

(11) Driving lever charging completion state When the roller 13 provided on the driving lever 11 reaches the cam top portion 22d of the second cam 22c of the second cam gear 22, the driving lever 11 is biased by the blade driving spring 14. Held against. If the motor is de-energized in this state, it enters a standby state before release. In this embodiment, the focal plane shutter 200 includes only the rear curtain, but is not limited to this. That is, the present invention is also applicable to a focal plane shutter having both a front curtain and a rear curtain. The present invention can be applied to only one of the front curtain and the rear curtain, or to both the front curtain and the rear curtain. The present invention can also be applied to a double light shielding type focal plane shutter.

  Thus, in the present embodiment, the shutter device (focal plane shutter 200) includes the shutter base plate 1 in which the opening 1a is formed, the light shielding member (blade group 40), the first drive member (drive lever 11), A second drive member (blade lever 15). The shutter device also includes a locking member (first cam gear 21) and a braking member (brake lever 25). The light shielding member can reciprocate between a closed state in which the opening is closed and an open state in which the opening is opened. The first drive member is connected to the light shielding member and rotates relative to the shutter base plate. The second drive member drives the first drive member. The locking member locks the second driving member, and the second driving member is in contact with the first driving member, and the second driving member is the first driving member. It is possible to switch to a second state (a two-body state) that is remote from. The braking member can brake the reciprocating motion of the second drive member. The locking member operates to charge the braking member. Alternatively, the locking member has a cam (brake charge cam 21c), and the braking member can be operated by the cam.

  Preferably, the locking member has a cam 21c that charges the braking member against a frictional force. Preferably, the braking member has a cam follower 25c that can come into contact with the cam. Preferably, the first drive member and the second drive member are rotatable with respect to a common shaft 1b of the shutter base plate. Preferably, the second driving member drives the first driving member in a direction in which the light shielding member closes the opening.

  Preferably, the shutter device includes a blade return spring 46 that biases the first drive member in a direction in which the light shielding member opens the opening, and a blade drive spring that biases the first drive member in a direction in which the light shielding member closes the opening. 14. More preferably, the second drive member performs the main travel by rotation based on the biasing force of the blade drive spring, and performs the return travel by rotation based on the biasing force of the blade return spring. More preferably, the second drive member has a blade drive pin 15a, and the braking member is a first lever portion (main travel lever portion 25a) and a second lever portion (return travel lever portion 25b). And have. The first lever portion abuts against the blade drive pin during the main traveling and brakes the second drive member. The second lever portion abuts against the blade drive pin during return running and brakes the second drive member. More preferably, the first lever portion is provided at a position closer to the rotation center of the braking member than the second lever portion.

  Preferably, the locking member charges the braking member from the standby position for the return travel to the standby position for the main travel. Also preferably, after the return travel, the locking member pushes the braking member and charges it to the braking start position during the main travel. Preferably, the braking member is charged by both the force generated by the return travel and the pressing force of the locking member to the standby position for the main travel. Preferably, the shutter device is an electronic front curtain type shutter device.

  According to the present embodiment, it is possible to provide a shutter device and an imaging device capable of appropriately braking the traveling of the blade group.

  As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to these embodiment, A various deformation | transformation and change are possible within the range of the summary.

1 shutter base plate 11 drive lever (first drive member)
15 Blade lever (second drive member)
21 First cam gear (locking member)
25 Brake lever (braking member)
40 blade group (shading member)
200 Focal plane shutter (shutter device)

Claims (15)

A shutter base plate in which an opening is formed;
A light shielding member capable of reciprocating between a closed state for closing the opening and an open state for opening the opening;
A first drive member coupled to the light blocking member and rotating relative to the shutter base plate;
A second drive member for driving the first drive member;
A second state in which the second driving member is locked and the second driving member is in contact with the first driving member, and the second driving member is separated from the first driving member. A locking member capable of switching between the state of
A braking member capable of braking the reciprocating motion of the second drive member,
The shutter member, wherein the locking member operates to charge the braking member. A shutter base plate in which an opening is formed;
A light shielding member capable of reciprocating between a closed state for closing the opening and an open state for opening the opening;
A first drive member coupled to the light blocking member and rotating relative to the shutter base plate;
A second drive member for driving the first drive member;
A second state in which the second driving member is locked and the second driving member is in contact with the first driving member, and the second driving member is separated from the first driving member. A locking member capable of switching between the state of
A braking member capable of braking the reciprocating motion of the second drive member,
The locking member has a cam;
The shutter device, wherein the braking member is operable by the cam.   The shutter device according to claim 1, wherein the locking member includes a cam that charges the braking member against a frictional force.   The shutter device according to claim 2, wherein the braking member includes a cam follower capable of contacting with the cam.   5. The shutter device according to claim 1, wherein the first drive member and the second drive member are rotatable with respect to a common axis of the shutter base plate. 6.   6. The shutter device according to claim 1, wherein the second driving member drives the first driving member in a direction in which the light shielding member closes the opening. 6. A blade return spring that biases the first drive member in a direction in which the light shielding member opens the opening;
The shutter device according to claim 1, further comprising: a blade drive spring that biases the first drive member in a direction in which the light shielding member closes the opening. The second drive member is
Perform the main run by rotation based on the urging force of the blade drive spring,
The shutter device according to claim 7, wherein return travel is performed by rotation based on an urging force of the blade return spring. The second drive member has a blade drive pin,
The braking member is
A first lever portion that abuts against the blade drive pin during the main travel and brakes the second drive member;
The shutter device according to claim 8, further comprising a second lever portion that abuts on the blade driving pin and brakes the second driving member during the return traveling.   The shutter device according to claim 9, wherein the first lever portion is provided at a position closer to a rotation center of the braking member than the second lever portion.   The shutter according to claim 8, wherein the locking member charges the braking member from a standby position for the return travel to a standby position for the main travel. apparatus.   The said latching member pushes the said braking member after the said return driving | running | working, and charges to the braking start position in the case of the said main driving | running | working, The one of Claim 8 thru | or 11 characterized by the above-mentioned. Shutter device.   13. The brake member according to claim 8, wherein the brake member is charged by both the force generated by the return travel and the pressing force of the locking member to the standby position for the main travel. The shutter device described in 1.   The shutter device according to any one of claims 1 to 13, wherein the shutter device is an electronic front curtain type shutter device. The shutter device according to any one of claims 1 to 14,
An image pickup apparatus comprising: an image pickup device that photoelectrically converts an optical image formed through an image pickup optical system.