JP6433857B2 - Focal plane shutter, imaging apparatus and electronic apparatus including the same - Google Patents

Description

  The present invention relates to a focal plane shutter, an imaging apparatus including the same, and an electronic apparatus.

  For digital cameras, etc., when the camera is on standby, the front and rear blades are retracted from the exposure aperture and the exposure aperture is opened so that the subject image can be captured. In many cases, a focal plane shutter that enables normally open photography is used.

  For a focal plane shutter that enables normally open photography, the leading blade drive mechanism includes, for example, a leading blade first driving member to which the leading blade is directly connected, and a leading blade first by a biasing force by a driving spring. There is one constituted by two driving members, a leading blade second driving member that drives the driving member to follow. When the release button is pressed at the time of shooting, first the first blade first drive member moves the front blade to the set position before the exposure operation (position where the exposure opening is closed), and then the second front blade second. This is a leading blade driving mechanism that causes the leading blade to travel to the exposure operation end position (position where the exposure opening is opened) by rotating the driving member with the leading blade first driving member.

  Further, the drive mechanism for the reciprocating travel of the rear blade includes, for example, a rear blade first drive member in which the rear blade is directly connected and a rear blade second drive in which the rear blade first drive member is driven by an urging force of a drive spring. There is one constituted by two drive members. The trailing blade first drive member sets the leading blade to the set position before the exposure operation (position where the exposure opening is opened), and the trailing blade second drive member rotates with the trailing blade first drive member. This is a trailing blade drive mechanism that causes the leading blade to travel to the exposure operation end position (position where the exposure opening is closed).

  In the driving mechanism of the leading blade, when the leading blade first driving member travels the leading blade to the set position before the exposure operation, the leading blade causes the leading blade to bounce at the end of traveling of the leading blade first driving member. Shake occurs. If the leading blade exposure operation by the leading blade second drive member is executed before the leading blade shake is settled, the leading blade movement becomes unstable, so the leading blade exposure operation until the leading blade shake converges Need to wait. Therefore, a means for shortening the time until the shake of the leading blade at the end of traveling converges is required.

  In the rear blade drive mechanism, when the rear blade second drive member travels the rear blade to the exposure operation end position with the rear blade first drive member, the rear blade first drive member travels. Due to the bouncing at the end, the rear blade shakes. This shaking of the rear blades causes exposure unevenness and smear, and also has to delay the timing for performing the setting operation, and also causes the next shooting timing to be delayed.

  For example, in Patent Document 1, at the end of the exposure operation, a part of the main drive member (second drive member) is brought into contact with the annular buffer member, and then a part of the sub drive member (first drive member) (drive pin). ) In contact with the C-shaped buffer member, and the main drive member bounces against the annular buffer member (both moves in the opposite direction) and moves toward the annular buffer member again. A focal plane shutter is disclosed in which the bounce of the driven member is suppressed by forcibly pushing back the driven part of the driven member that bounces after coming into contact with the C-shaped buffer member. ing.

JP 2013-97032 A

  In order to satisfy the increase in the frame speed required for the shutter performance or the increase in the shutter speed, it is necessary to increase the urging force of the urging spring of the driving member that causes the shutter blades to travel so that the driving member can travel at a high speed. There is. However, the impact at the end of travel increases in proportion to the speedup of the drive member, and as a result, the bounce of the drive member, the shaking of the shutter blades, etc., increase the release time lag and hinder the high frame speed in continuous shooting. At the same time, the durability of the parts decreases.

  In the focal plane shutter disclosed in Patent Document 1, the interval between the timing at which the main drive member abuts on the annular cushioning member and the timing at which the slave drive member abuts on the C-shaped cushioning member is very short. The timing at which the pushing portion of the main drive member forcibly pushes back the pushed portion of the sub-drive member is set to this very short interval by using the action toward the annular cushioning member after bouncing after contacting the It's not easy. Furthermore, since the main drive member and the driven drive member are brought into contact with other members such as the buffer member a plurality of times, the shutter blades may rattle and the desired buffer effect may not be sufficiently obtained.

  The present invention has been made in view of the above circumstances, and can simplify the structure, improve the durability of the components, reduce the release time lag, and improve the continuous shooting speed. It is an object of the present invention to provide a focal plane shutter and an imaging apparatus and electronic apparatus including the focal plane shutter.

In order to achieve the above object, a focal plane shutter according to the first aspect of the present invention provides:
A leading blade member and a trailing blade member that make the exposure opening formed in the base plate into a closed state and an open state;
A first front blade connected to the front blade member and driven by the biasing force of the first biasing member to drive the front blade member so that the exposure opening is changed from the open state to the closed state. A drive member;
With the biasing force of the second biasing member in the direction opposite to the biasing force of the first biasing member, the biasing force of the first biasing member is resisted against the biasing force of the first biasing member. A second leading blade driving member that drives the leading blade member so that the exposure opening changes from the closed state to the open state,
A first trailing blade connected to the trailing blade member and driven by the biasing force of a third biasing member to drive the trailing blade member so that the exposure opening is changed from the closed state to the opened state. A drive member;
With the biasing force of the fourth biasing member in the direction opposite to the biasing force of the third biasing member, the biasing force of the third biasing member is resisted against the biasing force of the third biasing member. A second rear blade driving member that drives the rear blade member so that the exposure opening is changed from the open state to the closed state,
By rotating and driving in a fixed direction, the first leading blade driving member is set at the first operation start position before traveling against the biasing force of the first biasing member, and the second leading blade driving member is set. The blade driving member is set at the second operation start position before traveling against the biasing force of the second biasing member, and the first trailing blade driving member is biased by the third biasing member. Against the urging force of the fourth urging member to the fourth operation start position before traveling against the urging force of the fourth urging member. A set member to be set;
A brake member that brakes travel of the first leading blade driving member by the biasing force of the first biasing member while being in sliding contact with the first leading blade driving member;
A locking member that locks the first trailing blade driving member against the biasing force of the third biasing member,
The set member is
After the brake member is brought into contact so as to act immediately before the end of traveling of the first leading blade driving member, and the traveling of the first leading blade driving member by the biasing force of the first biasing member is stopped , Spaced from the first leading blade drive member,
Before the travel of the first rear blade drive member, the lock member is operated to act on the first rear blade drive member, and immediately before the second rear blade drive member travels, A brake member that brakes the travel of the second rear blade drive member is pushed and operated to act on the second rear blade drive member;
It is characterized by that.

In order to achieve the above object, a focal plane shutter according to the second aspect of the present invention provides:
A blade member that makes the exposure opening formed in the base plate into a closed state and an open state;
A first blade driving member coupled to the blade member and driven by the biasing force of the first biasing member to drive the blade member so that the exposure opening is changed from the open state to the closed state; ,
With the first blade driving member against the biasing force of the first biasing member by the biasing force of the second biasing member in the direction opposite to the biasing force of the first biasing member. A second blade driving member that drives the blade member so that the exposure opening changes from the closed state to the open state by running;
By rotating and driving in a fixed direction, the first blade driving member is set at the first operation start position before traveling against the biasing force of the first biasing member, and the second blade driving is performed. A set member for setting the member at the second operation start position before traveling against the biasing force of the second biasing member;
A brake member that brakes travel of the first blade driving member by the biasing force of the first biasing member while being in sliding contact with the first blade driving member;
The set member contacts the brake member so as to act immediately before the end of travel of the first blade drive member, and the travel of the first blade drive member by the biasing force of the first bias member is performed. After stopping, separating from the first blade driving member;
It is characterized by that.

In order to achieve the above object, a focal plane shutter according to a third aspect of the present invention provides:
A blade member that makes the exposure opening formed in the base plate into a closed state and an open state;
A first blade driving member connected to the blade member and driven by the biasing force of the first biasing member to drive the blade member so that the exposure opening changes from the closed state to the open state; ,
With the first blade driving member against the biasing force of the first biasing member by the biasing force of the second biasing member in the direction opposite to the biasing force of the first biasing member. A second blade driving member that drives the blade member so that the exposure opening is changed from the open state to the closed state by running;
A lock member for locking the first blade driving member against the biasing force of the first biasing member;
By rotating and driving in a fixed direction, the first blade driving member is set at the first operation start position before traveling against the biasing force of the first biasing member, and the second blade driving is performed. A set member that sets the member at the second operation start position before traveling against the urging force of the second urging member;
The set member operates the lock member to act on the first blade driving member before traveling of the first blade driving member, and immediately before the traveling of the second blade driving member. Is operated to push the brake member that brakes the travel of the second blade driving member and to act on the second blade driving member.
It is characterized by that.

  According to the present invention, the focal plane shutter capable of simplifying the structure and improving the durability of the components, shortening the release time lag, and improving the continuous shooting speed, and an imaging apparatus including the same In addition, an electronic device can be provided.

It is a flowchart which shows imaging | photography operation | movement of the focal plane shutter which concerns on this Embodiment. It is a figure which shows the initial state of a focal plane shutter. It is a figure which shows the state of a leading blade return operation start. It is a figure which shows the state of the brake member set completion in the middle of a leading blade return operation | movement and leading blade exposure operation | movement. It is a figure which shows the state of the completion | finish of front blade | wing return operation | movement and the brake member retracting | retreating for front blade exposure operation | movement. It is a figure which shows the retracted state of the brake member for leading blade return operation | movement. It is a figure which shows the state in the middle of front-blade exposure operation | movement. It is a figure which shows the state in operation | movement of the brake member for front-blade exposure operation | movement. It is a figure which shows the state during the braking operation | movement of the brake member for rear-blade exposure operation | movement. It is a figure which shows the state of charge completion of the drive blade for rear-blade exposure operation | movement. It is a figure which shows the state of the brake member setting operation | movement start for rear-blade exposure operation | movement.

  Hereinafter, a focal plane shutter according to an embodiment of the present invention will be described with reference to the drawings. There are two types of focal plane shutters, a direct type and a locking type, depending on the configuration for holding the drive member at the operation start position (travel start position) immediately before the start of photographing. The focal plane shutter according to the present embodiment is a locking type in which each driving member is locked by each locking member at the operation start position, but can also be applied to a direct type.

  The focal plane shutter 500 according to the present embodiment is provided in an imaging device having an imaging device, an electronic device, and the like, and has an automatic focus adjustment (AF) mechanism and a camera shake prevention mechanism (for example, Optical) to prevent camera shake. Image Stabilizer: OIS). The imaging device is a camera including a digital camera, a surveillance camera, or the like, and the electronic device is a portable terminal including a smartphone having an imaging function, a laptop personal computer, or the like. The imaging element is a CCD (Charge Couples Device), a CMOS (Completary Metal Oxide Semiconductor) image sensor, or the like.

  First, the configuration of the focal plane shutter 500 according to the present embodiment will be described with reference to FIG. When the focal plane shutter 500 according to this embodiment is incorporated in a camera, the front side (front side) in FIG. 2 is the subject side (photographing lens side), and the back side in FIG. 2 is the image sensor side. The explanation is based on the assumption. In the case of a digital camera, the front side in FIG. 2 may be the image sensor side and the back side in FIG. 2 may be the subject side.

  As shown in FIG. 2, a horizontally elongated exposure opening 1 a is formed at a substantially central portion of the shutter base plate 1. Further, an intermediate plate and an auxiliary ground plate are sequentially attached to the rear side of the shutter base plate 1 with a predetermined interval. Further, a blade chamber of a leading blade is formed between the shutter base plate 1 and the intermediate plate, and a blade chamber of a trailing blade is formed between the intermediate plate and the auxiliary ground plate. In the intermediate plate and the auxiliary ground plate, an opening having a slightly different shape and size from the opening 1a is formed. Note that the shape of the exposure opening as a shutter unit for allowing the subject light to pass through may be formed by two or more of these openings, but in the present embodiment, only the shape of the opening 1a is the exposure opening. The shape is determined. In the present embodiment, the shutter base plate 1 is made of, for example, a synthetic resin.

  Two arc-shaped long holes 2 a and 2 b are formed in the opening 1 a of the shutter base plate 1. Rubber cushioning members having a substantially C-shaped planar shape are attached to the upper end of the long hole 2a and the lower end of the long hole 2b, respectively. Further, the intermediate plate and the auxiliary ground plate are formed with long holes having substantially the same shape in regions overlapping with the long holes 2a and 2b.

  On the surface side (subject side) of the shutter base plate 1, shafts 10a, 10b, 10c, 10d, 10e, 10f, 10g, and 10h are erected. Actually, a plurality of pillars are erected on the surface side of the shutter base plate 1 in addition to this.

  The leading blade driving mechanism includes a leading blade locking member 110, a first leading blade driving member 120, a second leading blade driving member 130, a leading blade return operation brake member 140, and a leading blade exposure operation brake member 150. Composed.

  The leading blade lock member 110 is a member for holding the charged first leading blade driving member 120 at the operation start position. Here, charging refers to an operation of applying a biasing force to a biasing member (spring) that generates a driving force for running (exposure operation) the leading blade and the trailing blade. The leading blade lock member 110 is supported so as to be rotatable around the shaft 10b. The leading blade lock member 110 includes a driven part 110a, a support part 110b, and a pressing part 110c.

  The driven portion 110a is a portion formed in an arm shape so as to abut on a first cam 310a of a set member 310 to be described later. In addition, the distal end portion of the driven portion 110a is formed in a substantially circular shape so as to be in sliding contact with the first cam 310a. As the driven portion 110a is slid by the first cam 310a, the leading blade lock member 110 rotates clockwise.

  The support part 110b is a part that comes into contact with the supported part 120a of the first leading blade driving member 120 described later. The first leading blade driving member 120 is supported by the supported portion 110 b by the supported portion 110 b, thereby suppressing rotation in the urging direction (clockwise) by a leading blade set spring (not shown).

  The pushing portion 110c is a portion that slides on a roller 150b of a brake member 150 for leading blade exposure operation described later. When the pushing portion 110c slides on the roller 150b, the leading blade exposure operation brake member 150 rotates counterclockwise. Accordingly, the braking portion 150a of the leading blade exposure operation brake member 150 is disposed at the lower end of the long hole 2a, and the first leading blade driving member 120 travels counterclockwise following the second leading blade driving member 130. It functions as a braking member (brake).

  The first leading blade driving member 120 is a member for returning the leading blade 20 so as to cover the opening 1a. The first leading blade driving member 120 is supported so as to be rotatable around the shaft 10c. The first leading blade drive member 120 is biased to rotate clockwise by the leading blade set spring. The first leading blade driving member 120 includes a supported portion 120a, a pushed portion 120b, a driving pin 120c, and a braked portion 120d.

  The supported portion 120 a is a portion that is supported by the support portion 110 b of the leading blade lock member 110. When the supported portion 120a is supported by the support portion 110b, the first leading blade driving member 120 is prevented from rotating in the biasing direction (clockwise) due to the biasing force of the leading blade set spring.

  The driven portion 120b is a portion that is pushed by the pushing portion 130a of the second leading blade driving member 130, which will be described later, when the second leading blade driving member 130 performs an exposure operation by a biasing force of a leading blade driving spring (not shown). It is. When the driven portion 120b is pushed by the pushing portion 130a of the second leading blade driving member 130, the first leading blade driving member 120 is driven by the urging force of the leading blade driving spring of the second leading blade driving member 130. Then, it rotates counterclockwise together with the second leading blade driving member 130.

  The drive pin 120 c is formed on the back side of the first leading blade drive member 120 and is inserted into the long hole 2 a of the shutter base plate 1. The drive pin 120c is connected to the leading blade 20 in the blade chamber of the leading blade formed between the shutter base plate 1 and the intermediate plate. As a result, the leading blade 20 is unfolded or overlapped with the reciprocating travel of the first leading blade driving member 120, and the opening 1a can be opened or closed.

  The braked portion 120d is in contact with the braking portion 140a of the leading blade return operation brake member 140 immediately before the end of the return operation of the first leading blade drive member 120, and the first leading blade drive member 120 is subjected to braking. is there. Further, when the first leading blade driving member 120 is driven to rotate counterclockwise by the biasing force of the leading blade driving spring of the second leading blade driving member 130, the braked portion 120d is exposed to the leading blade in the vicinity of the lower end of the long hole 2a. After the rotation is braked by contacting the braking portion 150a of the operation brake member 150, the rotation is stopped by the drive pin 120c coming into contact with the buffer member at the lower end of the long hole 2a.

  The second leading blade driving member 130 is a member for causing the leading blade 20 to perform an exposure operation so that the first leading blade driving member 120 is driven to rotate to open the opening 1a. Similar to the first leading blade driving member 120, the second leading blade driving member 130 is supported so as to be rotatable about the shaft 10c. Further, the second leading blade driving member 130 rotates counterclockwise while pushing the first leading blade driving member 120 by the biasing force of the leading blade driving spring, and the driving pin 120c of the first leading blade driving member 120 travels. The rotation of the second leading blade driving member 130 stops when it reaches the lower end of the long hole 2a that is the end position. At this time, since the pushing portion 130a of the second leading blade driving member 130 is in contact with the pushed portion 120b of the first leading blade driving member 120, the rotation of the second leading blade driving member 130 is also stopped. The second leading blade driving member 130 has a pushing portion 130a.

  The pushing portion 130 a is a portion that pushes the pushed portion 120 b of the first leading blade driving member 120. When the second leading blade driving member 130 rotates counterclockwise by the biasing force of the leading blade driving spring to perform the exposure operation, the pushing portion 130a pushes the pushed portion 120b of the first leading blade driving member 120. The first leading blade driving member 120 is driven to rotate.

  The leading blade return operation brake member 140 travels when the first leading blade driving member 120 travels (clockwise) in the direction (clockwise) to close the opening 1a by the biasing force of the leading blade set spring. This is a member for braking the travel of the first leading blade driving member 120 immediately before the end. The leading blade return operation brake member 140 is supported so as to be rotatable about the shaft 10e. The leading blade return operation brake member 140 includes a braking portion 140a and a pushed portion 140b.

  The braking unit 140a contacts the braked unit 120d of the first leading blade driving member 120 to brake the rotation (leading blade return operation) of the first leading blade driving member 120 to the operation start position before the exposure operation. This is a part for locking the braked portion 120d of the first leading blade driving member 120 and holding the first leading blade driving member 120 at the operation start position before the exposure operation (exposure operation). When the driven portion 140b is pushed by the second cam 310b of the set member 310, the leading blade return operation brake member 140 rotates clockwise, and the braking portion 140a is engaged with the first leading blade driving member that has been locked. It is separated from 120 braked parts 120d.

  The driven portion 140b is a portion formed in an arm shape so as to be slid by a second cam 310b of a set member 310 described later. When the driven portion 140b is pushed by the second cam 310b, the leading blade return operation brake member 140 rotates clockwise.

  The brake member 150 for leading blade exposure operation travels in a direction (counterclockwise) in which the second leading blade driving member 130 opens the opening 1a with the first leading blade driving member 120 by the biasing force of the leading blade driving spring ( This is a member for braking the travel of the second leading blade driving member 120 immediately before the travel is completed when the exposure operation is performed. The leading blade exposure operation brake member 150 is supported so as to be rotatable about a shaft 10d. The leading blade exposure operation brake member 150 is not biased by the biasing spring and can only be passively rotated. The leading blade exposure operation brake member 150 includes a braking portion 150a and a roller 150b.

  When the second leading blade driving member 130 rotates counterclockwise with the first leading blade driving member 120 by the urging force of the leading blade driving spring (exposure operation), the braking portion 150a is driven by the first leading blade driving member 120. This is a portion that contacts the braked portion 120d and brakes the rotation of the second leading blade driving member 130. The braking portion 150a is disposed at the lower end of the long hole 2a when the roller 150b is pushed by the pushing portion 110c of the leading blade locking member 110 and the leading blade exposure operation brake member 150 rotates counterclockwise. . Thereby, the brake part 150a functions as a brake that brakes the second leading blade driving member 130 that rotates counterclockwise.

  The roller 150 b is a portion that is pushed by the pushing portion 110 c of the leading blade lock member 110. When the roller 150b is pushed by the pushing portion 110c, the leading blade exposure operation brake member 150 rotates counterclockwise, and the braking portion 150a of the leading blade exposure operation brake member 150 comes to the lower end of the long hole 2a. Be placed. It should be noted that the braking portion 150a of the leading blade exposure operation brake member 150 is disposed at a position where the braking portion 150a can contact the braked portion 120d of the first leading blade driving member 120 before the buffer member attached to the lower end of the long hole 2a. Is done. Thus, the leading blade exposure operation brake member 150 functions as a braking member (brake) that brakes the rotation of the second leading blade driving member 130.

  The trailing blade driving mechanism includes a trailing blade locking member 210, a first trailing blade driving member 220, a second trailing blade driving member 230, and a trailing blade exposure operation brake member 240.

  The rear blade locking member 210 is a member for holding the charged first rear blade driving member 220 at the operation start position. The rear blade lock member 210 is also a member for braking rotation at a stage immediately before the end of the exposure operation of the rear blade second drive unit. The rear blade lock member 210 is supported so as to be rotatable around the shaft 10f. The rear blade lock member 210 includes a driven portion 210a and a support portion 210b.

  The driven portion 210a is a portion formed in an arm shape so as to be slid by a second cam 310b of a set member 310 to be described later. When the driven portion 210a is pushed by the second cam 310b, the trailing blade lock member 210 rotates clockwise.

  The support part 210b abuts on a supported part 220b of a first trailing blade driving member 220 described later, and supports the first trailing blade driving member 220 so that it does not rotate clockwise by a biasing force of a trailing blade set spring (not shown). It is a member.

  The first rear blade driving member 220 is a member for causing the rear blade 30 to travel so as to open the opening 1a. The first trailing blade driving member 220 is supported so as to be rotatable around the shaft 10g. Further, the first trailing blade drive member 220 is biased to rotate clockwise by the trailing blade set spring. The first rear blade driving member 220 includes a driving pin 220a, a supported portion 220b, a driven portion 220c, and a braked portion 220d.

  The drive pin 220 a is formed on the back side of the first rear blade drive member 220 and is inserted into the long hole 2 b of the shutter base plate 1. The drive pin 220a is connected to the rear blade in the blade chamber of the rear blade formed between the intermediate plate and the auxiliary ground plate. As a result, the rear blade 30 is deployed or overlapped with the reciprocating travel of the first rear blade driving member 220, and the opening 1a can be opened or closed.

  The supported portion 220 b is a portion that is supported by the support portion 210 b of the rear blade lock member 210. As the supported portion 220b is supported by the support portion 210b, the first trailing blade driving member 220 is prevented from rotating in the biasing direction (clockwise) due to the biasing force of the trailing blade set spring.

  The driven portion 220c is a portion that is pushed by the pushing portion 230a of the second trailing blade driving member 230, which will be described later, when the second trailing blade driving member 230 performs an exposure operation by a biasing force of a trailing blade driving spring (not shown). It is. When the driven portion 220c is pushed by the pushing portion 230a, the first trailing blade driving member 220 rotates counterclockwise following the urging force of the trailing blade driving spring of the second trailing blade driving member 230. .

  The braked portion 220d is a portion that comes into contact with a braking portion 240b of a rear blade exposure operation brake member 240, which will be described later, immediately before the end of the traveling operation of the first rear blade driving member 220. The first trailing blade driving member 220 is subjected to braking by the braked portion 220d coming into contact with the braking portion 240b. Further, when the first trailing blade driving member 220 is driven to rotate counterclockwise by the urging force of the trailing blade driving spring of the second trailing blade driving member 230, the trailing blade locking member and the trailing blade are moved immediately before the end of the exposure operation. The rotation is braked by the action of the blade brake member. Thereafter, rotation stops when the braked portion 220d comes into contact with the buffer member at the lower end of the long hole 2b, which is the end position of the exposure operation.

  The second trailing blade driving member 230 is a member for causing the trailing blade 30 to perform an exposure operation so that the first trailing blade driving member 220 is driven to rotate to close the opening 1a. Similar to the first trailing blade driving member 220, the second trailing blade driving member 230 is supported so as to be rotatable about the shaft 10g. Further, the second trailing blade driving member 230 rotates counterclockwise while pushing the first trailing blade driving member 220 by the biasing force of the trailing blade driving spring, and the driving pin 220a of the first trailing blade driving member 220 travels. The rotation of the second trailing blade driving member 230 stops when it reaches the lower end of the long hole 2b that is the end position. At this time, since the pushing portion of the second trailing blade driving member 230 is in contact with the pushed portion of the first trailing blade driving member 220, the rotation of the second trailing blade driving member 230 is also stopped. The second trailing blade driving member 230 has a pushing portion 230a.

  The pushing portion 230 a is a portion that pushes the pushed portion 220 c of the first trailing blade driving member 220. When the second trailing blade driving member 230 rotates in the biasing direction (counterclockwise) by the biasing force of the trailing blade driving spring, the pushing portion pushing portion 230a pushes the pushed portion 220c to drive the first trailing blade. The member 220 is driven to rotate.

  The rear blade exposure operation brake member 240 travels in a direction (counterclockwise) in which the second rear blade driving member 230 closes the opening 1a with the first rear blade driving member 220 by the biasing force of the rear blade driving spring ( This is a member for braking the travel of the second trailing blade drive member 230 immediately before the travel is completed when the exposure operation is performed. The rear blade exposure operation brake member 240 is supported so as to be rotatable about the shaft 10h. The rear blade exposure operation brake member 240 is not biased by the biasing spring and can only be passively rotated. The rear blade exposure operation brake member 240 functions as a brake that brakes the exposure operation of the second rear blade drive member 230. The rear blade exposure operation brake member 240 includes a driven portion 240a and a braking portion 240b.

  The pushed portion 240 a is a portion that is pushed from the pushed portion 210 a of the rear blade lock member 210. When the pushed portion 240a is pushed from the pushed portion 210a, the rear blade exposure operation brake member 240 rotates counterclockwise.

  The braking portion 240b is a part of the first rear blade driving member 220. The exposure operation of the second trailing blade driving member 230 that rotates with the first leading blade driving member 120 is indirectly braked by the braking portion 240b coming into contact with the braked portion 220d of the first trailing blade driving member 220. The

  The set member 310 operates various members included in the leading blade driving mechanism and the trailing blade driving mechanism. The leading blade driving mechanism and the trailing blade driving mechanism are controlled by a common set member 310.

  The set member 310 is supported so as to be able to rotate counterclockwise around the shaft 10a. The set unit 310 is connected to a drive motor (not shown) via a gear, and is driven to rotate counterclockwise by the drive motor. The set member 310 includes a first cam 310a and a second cam 310b.

  The first cam 310a is a part that pushes the driven portion 110a of the leading blade lock member 110 and rotates the leading blade lock member 110 clockwise.

  The second cam 310b is a part that pushes the pushed portion 140b of the leading blade return operation brake member 140 and rotates the leading blade return operation brake member 140 clockwise around the shaft 10e.

  Next, the operation of the focal plane shutter 500 according to the present embodiment will be described with reference to FIGS. Note that in FIGS. 3 to 11, only the reference numerals of members related to each operation are given for easy understanding.

  The focal plane shutter 500 is, for example, in the imaging of a still image in an imaging apparatus including the focal plane shutter 500, as shown in FIG. 1, from the initial state, the leading blade return operation, the exposure operation, the charging operation, and the trailing blade exposure operation. The brake member setting operation is performed in this order.

(initial state)
First, the initial state of the focal plane shutter 500 will be described. Here, the initial state means a state (live view state) where an imaging target can be continuously visually recognized on a display unit or the like of the imaging device in the imaging device including the focal plane shutter 500. That is, the focal plane shutter 500 is a normally open type focal plane shutter.

  As shown in FIG. 2, in the focal plane shutter 500, in the initial state, the leading blade 20 and the trailing blade 30 are closed, and the opening 1a of the shutter base plate 1 is open.

(Lead blade drive spring charge state)
The supported portion 120a of the first leading blade driving member 120 is locked by the supporting portion 110b of the leading blade lock member 110 (the leading blade lock state), and the second leading blade driving member 130 is a leading blade drive (not shown). It is in a locked state against the urging force of the spring.

(Rear blade drive spring charged state)
The supported portion 220b of the first rear blade drive member 220 is disengaged from the support portion 210b of the rear blade lock member 210 (rear blade lock release state), and the second rear blade drive member 230 is a rear blade drive spring (not shown). It is locked against the urging force.

(Brake member retracted state for leading blade exposure operation)
Furthermore, the leading blade return operation brake member 140 is in a state where the braking portion 140a faces the long hole 2a (the leading blade return brake member set state). On the other hand, the leading blade exposure operation brake member 150 is in a state in which the braking portion 150a is retracted from the lower end of the long hole 2a.

(Brake member set state for rear blade exposure operation)
The rear blade exposure operation brake member 240 is in a state in which the braking portion 240b faces the lower end of the locus of rotation in the braked portion 220d of the first rear blade driving member 220.

(Lead blade return action)
When the release button of the imaging apparatus is pressed during imaging using the imaging apparatus including the focal plane shutter 500, the focal plane shutter 500 first opens the leading blade 20 from the initial state in order to perform an exposure operation described later. Then, the opening 1a of the shutter base plate 1 is closed.

(Lead blade unlocked)
The leading blade return operation will be described with reference to FIGS. In the leading blade return operation, as shown in FIG. 3, the set member 310 is rotated counterclockwise around the shaft 10 a by a drive motor (not shown), and the first cam 310 a of the setting member 310 is moved to the leading blade locking member 110. Push and push the driven part 110a. The leading blade locking member 110 whose pushed portion 110a is pushed rotates clockwise about the shaft 10b.

  Due to the rotation of the leading blade locking member 110, the supported portion 120a of the first leading blade driving member 120 by the supporting portion 110b of the leading blade lock member 110 is released (the leading blade lock is released). Since the first leading blade driving member 120 is urged clockwise by a leading blade set spring (not shown), the first leading blade driving member 120 rotates clockwise around the shaft 10c to drive the first leading blade. The drive pin 120c of the member 120 travels from the lower end to the upper end through the long hole 2a.

(Front blade return brake action)
When the leading blade 20 is opened by the travel of the driving pin 120c of the first leading blade driving member 120 and the opening 1a of the shutter base plate 1 is closed, the braking portion 140a of the braking member 140 for the leading blade return operation is moved to the long hole 2a. 4, the braked portion 120d provided around the drive pin 120c of the first front blade drive member 120 is connected to the drive pin 120c as shown in FIG. In the middle of traveling, the first front blade driving member 120 is braked by coming into contact with the braking portion 140a of the front blade returning operation brake member 140.

  Since the leading blade return operation brake member 140 is biased counterclockwise by a leading blade return operation brake spring (not shown), the leading blade return operation brake member 140 strongly brakes the first leading blade drive member 120. Can be multiplied. Thereby, in the focal plane shutter 500, the convergence time until the position of the first leading blade driving member 120, that is, the leading blade 20, is stabilized can be shortened, and the time lag until the exposure operation can be shortened. When the travel of the drive pin 120c of the first leading blade driving member 120 is completed, the leading blade 20 opens and the opening 1a of the shutter base plate 1 closes.

(Brake member set for leading blade exposure operation)
On the other hand, as shown in FIG. 3, by the rotation of the leading blade locking member 110, the pushing portion 110c of the leading blade locking member 110 pushes the roller 150b of the leading blade exposure operation brake member 150, and the shaft 10d is centered. First, the leading blade exposure operation brake member 150 is rotated counterclockwise.

(Brake member set state for leading blade exposure operation)
As the leading blade exposure operation brake member 150 rotates, the braking portion 150a of the leading blade exposure operation brake member 150 faces the lower end of the long hole 2a as shown in FIG.

(Evacuation of leading blade lock member and leading blade bound locking)
Next, when the set member 310 further rotates counterclockwise around the shaft 10a, the pushed portion 110a of the leading blade lock member 110 comes off from the first cam 310a of the set member 310, as shown in FIG. The leading blade locking member 110 urged counterclockwise by a leading blade locking member spring (not shown) rotates counterclockwise about the shaft 10b, and is connected to the roller 150b of the leading blade exposure operation brake member 150. Release the contact and retreat to the initial position.

  On the other hand, the braking portion 140a of the leading blade return operation brake member 140 continues to contact the braked portion 120d of the first leading blade driving member 120, and the first leading blade driving member 120 (driving pin 120a) is in contact. Prevent bounds. Thereby, in the focal plane shutter 500, the convergence time until the position of the driving pin 120c of the first leading blade driving member 120, that is, the leading blade 20, is stabilized can be further shortened, and the time lag until the exposure operation can be shortened.

(Lead blade return action brake member retracted state)
When the set member 310 further rotates counterclockwise about the shaft 10a, as shown in FIG. 6, the second cam 310b of the set member 310 pushes the pushed portion 140b of the leading blade return operation brake member 140. Then, the leading blade return operation brake member 140 is rotated clockwise around the shaft 10e. Due to the rotation of the leading blade return operation brake member 140, the braking portion 140a of the leading blade return operation brake member 140 retreats from the elongated hole 2a.

  As a result, the driving pin 120c of the first leading blade driving member 120 completes traveling and is disposed at a position where exposure operation is possible. Further, since the braking portion 140a of the leading blade return operation brake member 140 is retracted from the long hole 2a by the pushing of the second cam 310b of the set member 310, the leading blade return operation brake member 140 is the first leading blade. The braking action can be exerted without affecting the travel start position and the exposure operation in the exposure operation of the drive pin 120c of the drive member 120.

  Since the leading blade return operation brake member 140 is urged counterclockwise by the leading blade return operation brake spring, the leading blade return operation brake member from the retracted state to the initial state after the exposure operation. Return to the brake member set state. Thereby, the leading blade return operation ends.

(Exposure operation)
Next, with reference to FIG. 7 to FIG. 9, an exposure operation in which light from an imaging target in imaging enters an imaging device of the imaging device will be described.

  After the driving pin 120c of the first leading blade driving member 120 is disposed at a position where exposure operation is possible, the energization of the leading blade electromagnet (not shown) is cut off, whereby the second leading blade driving member 130 is locked. Canceled.

(Lead blade exposure operation)
As shown in FIG. 7, when the second leading blade driving member 130 is unlocked, the second leading blade driving member 130 urged counterclockwise by a leading blade driving spring (not shown) Rotate counterclockwise around the center. In this case, since the pushing portion 130 a of the second leading blade driving member 130 pushes the pushed portion 120 b of the first leading blade driving member 120, the first leading blade driving member 120 is also the second leading blade driving member 130. And rotates counterclockwise about the shaft 10c.

  Thereby, the drive pin 120c of the first leading blade drive member 120 travels from the upper end to the lower end of the long hole 2a. As the drive pin 120c of the first leading blade driving member 120 travels, the leading blade 20 closes and the opening 1a of the shutter base plate 1 opens as shown in FIG.

(Brake action for leading blade exposure operation)
Since the braking portion 150a of the leading blade exposure operation brake member 150 is in the leading blade exposure operation brake member set state, as shown in FIG. 8, the braked portion 120d of the first leading blade driving member 120 is Immediately before the travel of the drive pin 120c of the blade driving member 120 is completed, the first blade driving member 120 is braked by coming into contact with the braking portion 150a of the brake member 150 for leading blade exposure operation.

  After the first leading blade driving member 120 is braked, the driving pin 120c of the first leading blade driving member 120 completes traveling and the leading blade 20 is closed. The supported portion 120a of the first leading blade driving member 120 is locked by the supporting portion 110a of the leading blade lock member 110 and returns to the leading blade lock state in the initial state.

  Also, the leading blade exposure operation brake member 150 that is in contact with the braked portion 120d of the first leading blade driving member 120 by the braking portion 150a rotates clockwise about the shaft 10d, and the leading blade exposure operation in the initial state. The brake member is returned to the retracted state.

(Rear blade exposure operation)
After a predetermined time has passed since the energization of the leading blade electromagnet, the energization of the unillustrated trailing blade electromagnet is interrupted, whereby the second trailing blade driving member 230 is unlocked.

  When the second trailing blade driving member 230 is unlocked, the second trailing blade driving member 230 biased counterclockwise by a trailing blade driving spring (not shown) has a shaft 10g as shown in FIG. Rotate counterclockwise around the center. In this case, since the pushing portion 230a of the second trailing blade driving member 230 pushes the pushed portion 220c of the first trailing blade driving member 220, the first trailing blade driving member 220 is also the first trailing blade driving member 220. And rotates counterclockwise around the shaft 10g.

  Thereby, the drive pin 220a of the first trailing blade drive member 220 travels from the upper end to the lower end of the long hole 2b. As the driving pin 220a of the first rear blade driving member 220 travels, the rear blade 30 opens and the opening 1a of the shutter base plate 1 closes.

(Brake action for rear blade exposure operation)
Since the braking portion 240b of the rear blade exposure operation brake member 240 is in the rear blade exposure operation brake member set state in the initial state, as shown in FIG. 9, the braked portion 220d of the first rear blade drive member 220 is Immediately before the completion of the rotation operation of the first trailing blade driving member 220, the first trailing blade driving member 220 is brought into contact with the braking portion 240b of the trailing blade exposure operation braking member 240.

  In this case, the rear blade exposure operation brake member 240 is a brake member that exerts a braking action by applying a load to the rotation of the first rear blade drive member 220, and is attached to the rear blade exposure operation brake member 240. Since the force is not acting (that is, self-reset), the rear blade exposure operation brake member 240 can apply strong braking to the first rear blade drive member 220. Since the rear blade exposure operation brake member 240 can apply strong braking to the first rear blade driving member 220, the durability of the rear blade 30 driven by the first rear blade driving member 220 and the second rear blade driving member 230 is increased. Can be improved.

(Rear blade locked)
After the first trailing blade driving member 220 is braked, the driving pin 220a of the first trailing blade driving member 220 completes traveling, the trailing blade 30 is opened, and the opening 1a of the shutter base plate 1 is closed. After the exposure operation is completed, the supported portion 220b of the first trailing blade driving member 220 is locked by the supporting portion 210b of the trailing blade lock member 210.

(Brake member retracted state for rear blade exposure operation)
On the other hand, the rear blade exposure operation brake member 240 rotates clockwise around the shaft 10h by the contact of the first rear blade drive member 220 with the braked portion 220d at the braking portion 240b, and the rear blade exposure operation. The braking portion 240b of the brake member 240 for use is in a state deviated from the locus of the rotational operation in the braked portion 220d of the first trailing blade driving member 220. Thereby, the exposure operation ends.

(Charge operation)
Next, the focal plane shutter 500 performs a charging operation for applying and biasing each of the second leading blade driving member 130 and the second trailing blade driving member 230 in preparation for the next imaging in the imaging apparatus.

  The charging operation includes a set member 310, a front blade electromagnet, a front blade iron lever provided with an iron piece attracted by a front blade electromagnet (not shown), a rear blade electromagnet, and an iron piece attracted by a rear blade electromagnet (not shown). This is performed by a well-known method using an iron lever for a rear blade provided. By the charging operation, the second leading blade driving member 130 returns to the leading blade driving spring charging state in the initial state, and the second trailing blade driving member 230 returns to the trailing blade driving spring charging state in the initial state.

  Finally, the focal plane shutter 500 performs a rear blade exposure operation brake member setting operation. Referring to FIGS. 10 and 11, the rear blade is returned to the rear blade exposure operation brake member set state in the initial state, after the rear blade exposure operation brake 240 is in the retracted state of the rear blade exposure operation brake member in the exposure operation. The brake member setting operation for exposure operation will be described.

  First, as shown in FIG. 10, the set member 310 is rotated counterclockwise around the shaft 10 a by a drive motor (not shown), and the second cam 310 b of the set member 310 is pushed by the driven portion 210 a of the rear blade lock member 210. Push to push away. The rear blade lock member 210, which is pushed by the driven portion 210a, rotates clockwise about the shaft 10f.

  Due to the rotation of the rear blade lock member 210, the supported portion 220b of the first rear blade drive member 220 in the rear blade lock state after the exposure operation is released. Since the first trailing blade driving member 220 is urged clockwise by a trailing blade set spring (not shown), the first trailing blade driving member 220 rotates clockwise around the shaft 10g, and the first trailing blade driving member 220 drive pins 220a travel through the long hole 2b from the lower end to the upper end.

  As the drive pin 220a of the first rear blade drive member 220 travels, the rear blade 30 closes and the opening 1a of the shutter base plate 1 opens. When the travel of the drive pin 220a of the first rear blade drive member 220 is completed, the rear blade 30 and the opening 1a of the shutter base plate 1 return to the initial state where the rear blade 30 is closed and the opening 1a of the shutter base plate 1 is opened. In addition, the first rear blade drive member 220 also returns to the rear blade lock release state in the initial state in which the supported portion 220b is disengaged from the support portion 210a of the rear blade lock member 210.

  On the other hand, as the set member 310 further rotates counterclockwise, the rear blade lock member 210 further rotates clockwise as shown in FIG. 11, and the rear blade exposure operation brake member 240 is driven by the driven portion 210a. The driven portion 240a is pushed. As a result, the rear blade exposure operation brake member 240 rotates counterclockwise about the shaft 10h, and the rear blade exposure operation brake member 240 that has been in the retracted state in the exposure operation becomes the initial state. Return to the rear blade exposure operation brake member set state.

  In the rear blade exposure operation brake member setting operation, the support member 220b of the first rear blade driving member 220 is unlocked by the rotation of the setting member 310, and the exposure operation of the first rear blade driving member 220 is completed. After returning from the initial state to the initial state, the rear blade exposure operation brake member 240 is set by the rotation of the set member 310. Therefore, the first rear blade drive member 220, the rear blade exposure operation brake member 240, The rear blade exposure operation brake member 240 having a strong braking force can be set. Thus, the blade exposure operation brake member setting operation is completed, and the focal plane shutter 500 returns to the initial state.

  As described above, in the leading blade return operation, the first blade driving member 120 can be strongly braked by the leading blade return operation brake member 140, and the convergence time until the position of the leading blade 20 is stabilized is shortened. In addition, the time lag until the exposure operation can be shortened. Further, the leading blade return operation brake member 140 prevents the first leading blade driving member 120 (driving pin 120c) from bouncing, further shortens the convergence time until the position of the leading blade 20 is stabilized, and until the exposure operation. The time lag can be shortened.

  Further, after the first trailing blade driving member 220 is returned from the state where the exposure operation is completed to the initial state by the rotation of the setting member 310, the trailing blade exposure operation brake member 240 is set by the rotation of the setting member 310. In this process, the interference between the first rear blade driving member 220 and the rear blade exposure operation brake member 240 can be prevented, and the rear blade exposure operation brake member 240 can be set. Further, since the rear blade exposure operation brake member 240 can apply strong braking to the first rear blade driving member 220, the durability of the rear blade 30 can be improved. For example, the rear blade 30 in this embodiment is a test of practical characteristics in accordance with “JIS 7091-1992” (4. Practical characteristics (1) Durability test of JIS 7091-1992). It can withstand the test of opening and closing operations.

  The above embodiments and modifications are exemplifications, and the present invention is not limited to these. Various embodiments are possible without departing from the spirit of the invention described in the claims. The components described in each embodiment and modification can be freely combined. The invention equivalent to the invention described in the claims is also included in the present invention.

DESCRIPTION OF SYMBOLS 1 Shutter base plate 1a Opening 2a, 2b Long hole 10a, 10b, 10c, 10d, 10e, 10f, 10g, 10h Shaft 20 Front blade 30 Rear blade 110 Front blade lock member 110a Pushed part 110b Support part 110c Pushing part
120 First leading blade drive member 120a Supported portion 120b Pushed portion 120c Drive pin 120d Braked portion 130 Second leading blade drive member 130a Pushing portion 140 Lead blade return operation brake member 140a Braking portion 140b Pushed portion 150 Lead blade exposure brake member 150a Braking part 150b Roller 210 Rear blade lock member 210a Pushed part 210b Support part 220 First rear blade drive member 220a Drive pin 220b Supported part 220c Pushed part 220d Braked part 230 Second rear blade drive member 230a Pushing portion 240 Rear blade exposure operation brake member 240a Pushed portion 240b Braking portion 310 Set member 310a First cam 310b Second cam 500 Focal plane shutter

Claims (3)

A leading blade member and a trailing blade member that make the exposure opening formed in the base plate into a closed state and an open state;
A first front blade connected to the front blade member and driven by the biasing force of the first biasing member to drive the front blade member so that the exposure opening is changed from the open state to the closed state. A drive member;
With the biasing force of the second biasing member in the direction opposite to the biasing force of the first biasing member, the biasing force of the first biasing member is resisted against the biasing force of the first biasing member. A second leading blade driving member that drives the leading blade member so that the exposure opening changes from the closed state to the open state,
A first trailing blade connected to the trailing blade member and driven by the biasing force of a third biasing member to drive the trailing blade member so that the exposure opening is changed from the closed state to the opened state. A drive member;
With the biasing force of the fourth biasing member in the direction opposite to the biasing force of the third biasing member, the biasing force of the third biasing member is resisted against the biasing force of the third biasing member. A second rear blade driving member that drives the rear blade member so that the exposure opening is changed from the open state to the closed state,
By rotating and driving in a fixed direction, the first leading blade driving member is set at the first operation start position before traveling against the biasing force of the first biasing member, and the second leading blade driving member is set. The blade driving member is set at the second operation start position before traveling against the biasing force of the second biasing member, and the first trailing blade driving member is biased by the third biasing member. Against the urging force of the fourth urging member to the fourth operation start position before traveling against the urging force of the fourth urging member. A set member to be set;
A brake member that brakes travel of the first leading blade driving member by the biasing force of the first biasing member while being in sliding contact with the first leading blade driving member;
A locking member that locks the first trailing blade driving member against the biasing force of the third biasing member,
The set member is
After the brake member is brought into contact so as to act immediately before the end of traveling of the first leading blade driving member, and the traveling of the first leading blade driving member by the biasing force of the first biasing member is stopped , Spaced from the first leading blade drive member,
Before the travel of the first rear blade drive member, the lock member is operated to act on the first rear blade drive member, and immediately before the second rear blade drive member travels, A brake member that brakes the travel of the second rear blade drive member is pushed and operated to act on the second rear blade drive member;
Focal plane shutter.   An imaging apparatus comprising the focal plane shutter according to claim 1.   An electronic apparatus comprising the focal plane shutter according to claim 1.

Images