JP6246005B2 - Focal plane shutter and camera - Google Patents

Description

  The present invention relates to a focal plane shutter having a blade member that opens and closes an opening for exposure, and in particular, opens and closes an opening for exposure in a digital camera such as a single-lens camera, a single-lens reflex camera, a mirrorless camera, or a rangefinder camera. The present invention relates to a focal plane shutter and a camera for driving a blade member to be opened and closed by a driving member connected through a long hole of a main plate.

  As a conventional focal plane shutter, a substantially rectangular ground plate having an opening for exposure, an intermediate plate and a back plate that are arranged at a predetermined distance from the ground plate and define a blade chamber, and a ground plate to open and close the opening of the ground plate A front blade (blade member) movably disposed in the blade chamber between the intermediate plate and the intermediate plate, a rear blade (blade member) movably disposed in the blade chamber between the intermediate plate and the back plate, and a ground plate for driving the front blade A front blade drive member having a drive pin disposed on the front side and connected to the front blade through a long hole in the main plate, disposed on the front side of the main plate to drive the rear blade and connected to the rear blade through the long hole in the main plate The rear blade drive member, the front blade drive member, and the rear blade drive member drive pins each having a driven pin are brought into contact with each other when the shutter operation is completed, and fixed to the end of the long hole of the base plate so as to alleviate the impact. Provided with a cushioning member made of rubber, and provided with a wall protruding around the long hole of the main plate, so that abrasion powder generated by the operation of the shutter mechanism (various movable members) is difficult to enter the blade chamber from the long hole Is known (see, for example, Patent Document 1).

However, in this focal plane shutter, a wall protruding around the long hole of the main plate is provided, and in the long hole region, the region other than the region through which the drive pin passes is still in an open state. Although it is possible to catch wear particles and oil droplets (lubricants) that have moved along the surface of the plate and collided with the walls, the wear and oil enemies that are scattered from the direction perpendicular to the ground plane are Since it passes through the open area and enters the blade chamber, it is not reliable as a foreign matter contamination countermeasure (contamination countermeasure).
In particular, with the recent increase in the number of pixels in the image sensor, foreign matter (abrasion powder, oil droplets, etc.) adhering to the imaging surface of the image sensor has an effect even on the quantity and size (size) that had not been affected before. As a result, a more reliable countermeasure against contamination is desired.

JP 2003-270700 A

  The present invention has been made in view of the above circumstances, and its object is to wear particles that affect the image sensor and the like while simplifying the structure and reducing the thickness and size of the device. Provided is a focal plane shutter capable of preventing a foreign matter such as oil droplets (lubricant) from entering a side of an image pickup element from a long hole of a base plate and shooting a higher definition image, and a camera using the focal plane shutter. There is.

The focal plane shutter of the present invention includes a ground plate having an opening for exposure and a long hole, a blade member movably disposed on the back side of the ground plate to open and close the opening, and a ground plate for driving the blade member. A focal plane shutter having a drive member having a drive pin that is movably disposed on the front surface side and is connected to a blade member through a long hole, wherein the long hole of the base plate is allowed to move while allowing the drive pin to move. A shielding member for shielding is provided.
According to this configuration, in the configuration in which the drive member is disposed on the front surface side of the ground plate, the blade member is disposed on the back surface side of the ground plate, and the drive pin of the drive member is coupled to the blade member through the long hole of the ground plate. Reciprocates within the range of the long hole, whereby the blade member opens and closes the opening.
Here, the long hole of the ground plane is a shielding member that allows the drive pin to move (for example, a shield that is provided so as to move integrally with the drive pin and moves along the surface of the ground plane so as to always shield the long hole). Wear particles or oil droplets generated from a movable member including the drive member, etc. Foreign matter such as (lubricant) can be prevented from entering the area where the blade member is disposed through the long hole, and therefore foreign matter can be prevented from adhering to the image sensor or the like disposed behind it. Can be prevented.

The said structure WHEREIN: The structure which is a thin film member formed with the resin material is employable as a shielding member.
According to this configuration, by using a thin film member made of a resin material as the shielding member, the structure is simplified, the apparatus is thinned and miniaturized, and the durability (wear resistance) is achieved. The drive pin can be smoothly moved without applying a load (resistance force) to the drive pin (by elastic deformation or the like when the shielding member is provided on the ground plate).

The said structure can employ | adopt the structure which has a cut | notch which accept | permits the movement of a drive pin while the shielding member is provided in a ground plane.
According to this configuration, when the shielding member is provided on the ground plane, the drive pin can be moved while expanding the cut by providing the cut so as to allow the relative movement of the drive pin. Since the shielding member is elastically restored so as to be shielded by its elastic force after the drive pin is moved, the drive pin can be moved smoothly while preventing entry of foreign matters such as wear powder and oil droplets (lubricant). Simplification of the structure and manufacturing of the shielding member can be achieved.

In the above configuration, the base plate is provided with a buffer member that abuts the drive pin on one end side of the long hole, and the cutout of the blocking member is formed up to a region overlapping the buffer member in the moving direction of the drive pin. Can be adopted.
According to this configuration, since the notch of the shielding member overlaps with the buffer member (the region beyond the position where the drive pin contacts the buffer member in the direction of movement of the drive pin), the drive pin is the buffer member. There is no resistance of the shielding member when it comes into contact, and the drive pin can be brought into contact with the buffer member reliably to obtain a desired buffer action.

In the above configuration, the blade member includes a front blade that opens the opening and a rear blade that closes the opening during the shutter operation, and the driving member includes a front blade driving member having a driving pin coupled to the front blade and a rear blade. Including a rear blade driving member having a driving pin connected to the blade, the main plate has a long hole through which the driving pin of the leading blade driving member and a driving pin of the rear blade driving member are passed; The structure arrange | positioned so that the long hole which lets the drive pin of a front blade drive member pass and the long hole which makes the drive pin of a rear blade drive member pass can be employ | adopted, respectively.
According to this configuration, the leading blade is driven to open / close by the leading blade driving member (driving pin thereof), and the trailing blade is driven to open / close by the trailing blade driving member (driving pin thereof) to perform the shutter operation (exposure operation). Since the oblong hole through which the drive pin of the leading blade drive member passes and the oblong hole through which the drive pin of the trailing blade drive member passes are respectively shielded by the shielding members, wear generated from the leading blade drive member and the trailing blade drive member, etc. It is possible to prevent foreign matters such as powder and oil droplets (lubricant) from entering the area where the front and rear blades are arranged through the two long holes, and hence imaging arranged behind them. It is possible to prevent foreign matter from adhering to the element or the like.

The camera of the present invention includes any one of the focal plane shutters having the above-described configuration, and an image sensor disposed behind the focal plane shutter.
According to this configuration, foreign substances such as wear powder and oil droplets (lubricant) that affect the image sensor are removed from the long holes in the ground plate while achieving a simplified structure, thinning and downsizing of the device, and the like. Can be prevented from entering the side, and high-definition images can be taken.

  According to the focal plane shutter having the above-described configuration, foreign matters such as wear powder and oil droplets (lubricant) that affect the image pickup device and the like are achieved while simplifying the structure and reducing the thickness and size of the apparatus. Therefore, it is possible to obtain a focal plane shutter and a camera that can capture a higher-definition image while preventing the long hole from entering the image sensor side.

FIG. 2 is a plan view showing a focal plane shutter according to an embodiment of the present invention, in which a blade member (a leading blade and a rear blade) is set at a set position before a shutter operation (before an exposure operation). In the focal plane shutter shown in FIG. 1, it is a top view which shows the state which the blade member (front blade and rear blade) completed shutter operation | movement. FIG. 1 shows a relationship between a drive member (leading blade drive member) included in the focal plane shutter shown in FIG. 1, a long hole in the main plate, a shielding member arranged to shield the long hole, and a drive pin passed through the long hole. It is a perspective view. FIG. 1 shows a relationship between a drive member (leading blade drive member) included in the focal plane shutter shown in FIG. 1, a long hole in the main plate, a shielding member arranged to shield the long hole, and a drive pin passed through the long hole. It is a top view. FIG. 1 shows a relationship between a drive member (leading blade drive member) included in the focal plane shutter shown in FIG. 1, a long hole in the main plate, a shielding member arranged to shield the long hole, and a drive pin passed through the long hole. It is sectional drawing.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
As shown in FIGS. 1 and 2, the focal plane shutter according to this embodiment is disposed with a predetermined interval from the ground plane 10 having the opening 10a for exposure and the two long holes 10b and 10, and the ground plane 10. A front blade 40 as a blade member movably disposed on the back plate 20, the intermediate plate 30 disposed between the base plate 10 and the back plate 20, the back surface side of the ground plate 10 (between the ground plate 10 and the intermediate plate 30), In order to drive the rear blade 50 and the front blade 40 as the blade members movably disposed on the back side of the base plate 10 (between the intermediate plate 30 and the back plate 20), it is movably disposed on the surface side of the base plate 10. A leading blade driving member 60 as a driving member, a trailing blade driving member 70 as a driving member movably disposed on the surface side of the base plate 10 to drive the trailing blade 50, a driving pin 60a of the leading blade driving member 60, and Rear blade drive member The two buffer members 80, 80 provided on one end side of the long holes 10b, 10c and the two long holes 10b, 10c of the base plate 10 are provided so as to shield each of the zero driving pins 70a. A set member (not shown) for setting the two shielding members 90, 90, the leading blade 40 and the trailing blade 50 (that is, the leading blade driving member 60 and the trailing blade driving member 70) at the set position before the shutter operation (before the exposure operation). ), A driving mechanism (not shown) for driving the set member, two electromagnets (not shown) for attracting and holding the leading blade driving member 60 and the trailing blade driving member 70 at the set position.

As shown in FIGS. 1 to 5, the base plate 10 is formed in a substantially rectangular flat plate shape, and has a substantially rectangular opening 10 a for exposure, a long hole 10 b in which an arc portion and a semicircular portion are continuous, and a long length. The supporting shafts 10d and 10e erected on the blade chamber side (back surface side) to support the hole 10c and the leading blade 40 in a rotatable manner, and the blade chamber side (back surface side) to support the rear blade 50 in a rotatable manner. The support shafts 10f and 10g erected on the front and the support shaft 10h erected on the outer side (surface side) of the blade chamber and the rear wing drive member 70 are rotatable to support the front blade drive member 60 in a rotatable manner. And a support shaft 10i provided upright on the outer side (surface side) of the blade chamber.
As shown in FIGS. 1, 2, and 5, the back plate 20 is disposed parallel to the base plate 10 at a predetermined interval and is detachably fixed to the base plate 10, and has an opening 20 a corresponding to the opening 10 a and the like. It has.
As shown in FIGS. 1, 2, and 5, the intermediate plate 30 is disposed between the base plate 10 and the back plate 20, defines a blade chamber that accommodates the leading blade 40 in cooperation with the base plate 10, and A blade chamber for accommodating the rear blade 50 is defined in cooperation with the plate 20 and includes an opening 30a corresponding to the opening 10a.

As shown in FIGS. 1 and 2, the leading blade 40 is composed of four blade bodies 41, 42, 43, 44 and two arms 45, 46 that connect the blade bodies 41, 42, 43, 44. Yes.
The arm 45 is rotatably supported by the support shaft 10 d, and a part of the arm 45 is connected to the drive pin 60 a of the leading blade drive member 60.
The arm 46 is rotatably supported by the support shaft 10e.
Then, as shown in FIG. 1, the arm 45 is driven upward (counterclockwise) in the figure by the leading blade driving member 60, whereby the four blade bodies 41, 42, 43, 44 are moved. The four blade bodies 41, 42 are developed by closing the opening 10a and being driven downward (clockwise) by the leading blade driving member 60 as shown in FIG. , 43, 44 overlap each other to open the opening 10a.

As shown in FIGS. 1 and 2, the rear blade 50 includes four blade bodies 51, 52, 53, 54 and two arms 55, 56 that connect the blade bodies 51, 52, 53, 54. Yes.
The arm 55 is rotatably supported by the support shaft 10 f, and a part of the arm 55 is connected to the drive pin 70 a of the rear blade drive member 70.
The arm 56 is rotatably supported by the support shaft 10g.
Then, as shown in FIG. 1, the arm 55 is driven upward (counterclockwise) in the figure by the rear blade driving member 70, whereby the four blade bodies 51, 52, 53, 54 are moved. The opening 10a is overlapped to open, and on the other hand, as shown in FIG. 2, the four blade bodies 51, 52, 53 and 54 are developed to close the opening 10a.

As shown in FIG. 1 and FIG. 2, the leading blade driving member 60 has a driving pin 60a to which the arm 45 of the leading blade 40 is connected. It includes an engaging portion 60b that is engaged and exerts a rotational force counterclockwise, an attracted portion (not shown) that is attracted by an electromagnet, and the like.
Here, the drive pin 60 a is formed so that the region passing through the long hole 10 b of the base plate 10 is formed in a columnar shape, and is inserted so as to spread the cut 91 of the shielding member 90.
The drive pin 60a may have an elliptical shape or the like that is long in the direction of the notch 91 in order to reduce the amount by which the notch 91 of the shielding member 90 is expanded.
The leading blade driving member 60 is rotatably supported by the support shaft 10h and is urged to rotate clockwise by an urging spring (not shown), so that the driving pin 60a is movably inserted into the long hole 10b. And is connected to the arm 45 of the leading blade 40 and rotated in the clockwise direction by the biasing spring in the resting state to move the leading blade 40 to the open position and the drive pin 60a contacts the buffer member 80. The blade is rotated counterclockwise by the set member to move the leading blade 40 to the closed position, and the attracted part is attracted by the energization of the electromagnet during the exposure operation by a signal such as a release and is held at the set position before the shutter operation. By de-energizing the electromagnet, the attraction by the magnetic force is released, and the leading blade 40 is moved to the open position by being rotated clockwise by the biasing force of the biasing spring. It has become.

As shown in FIGS. 1 and 2, the rear blade drive member 70 is a drive pin 70a to which the arm 55 of the rear blade 50 is connected. When the rear blade drive member 70 is set at the set position before the shutter operation (before the exposure operation), It includes an engaging portion 70b that is engaged and exerts a rotational force counterclockwise, an attracted portion (not shown) that is attracted by an electromagnet, and the like.
Here, the drive pin 70 a is formed so that a region passing through the long hole 10 c of the base plate 10 is formed in a columnar shape, and is inserted so as to spread the cut 91 of the shielding member 90.
The drive pin 70a may have an elliptical shape or the like that is long in the direction of the notch 91 in order to reduce the amount by which the notch 91 of the shielding member 90 is expanded.
The rear blade driving member 70 is rotatably supported by the support shaft 10i and is urged to rotate clockwise by an urging spring (not shown), so that the driving pin 70a is movably inserted into the long hole 10c. Are connected to the arm 55 of the rear blade 50 and rotated in the clockwise direction by the biasing spring in the resting state to move the rear blade 50 to the closed position and the drive pin 70a contacts the buffer member 80, The rear blade 50 is rotated counterclockwise by the set member to move the rear blade 50 to the open position, and the attracted portion is attracted by the energization of the electromagnet when the dew operation is performed by a signal such as a release, and is held at the set position before the shutter operation. By de-energizing the electromagnet, the attraction by the magnetic force is released, and the rear blade 50 is moved to the closed position by being rotated clockwise by the biasing force of the biasing spring. To have.

  The buffer members 80, 80 are made of an elastically deformable rubber material or the like, and are fixed by being fitted into semi-circular portions on one end side of the long holes 10b, 10c of the base plate 10 as shown in FIGS. When the shutter operation is completed, the drive pins 60a and 70a are brought into contact with each other to reduce the impact.

As shown in FIGS. 1 to 5, the shielding members 90 and 90 are made of resin materials (for example, polyethylene terephthalate) and the like so that the long holes 10 b and 10 c of the base plate 10 are shielded. It is formed as a thin fill member (for example, a thickness of 0.2 mm to 0.3 mm) having an area sufficiently wider than the area, and is fixed to the back surface side of the main plate 10.
As a fixing method, for example, resin rivet fastening, adhesion, and other methods can be adopted.
The shielding members 90, 90 are formed with cuts 91, 91 so as to allow relative movement of the drive pins 60a, 70a.
As shown in FIG. 4, the notches 91 and 91 are formed in a circular arc shape passing through the center in the width direction of the long holes 10b and 10c, have a length exceeding both ends of the long holes 10b and 10c, and the drive pin 60a. , 70a is formed up to a region overlapping with the buffer member 80 in the moving direction.

  As described above, by providing the cuts 91 and 91 that allow the drive pins 60a and 70a to move relative to the shielding members 90 and 90, the drive pins 60a and 70a push the cuts 91 and 91 apart. Further, since the shielding members 90 and 90 are elastically restored so that the opposing edges of the notches 91 and 91 are closely opposed to each other after the drive pins 60a and 70a are moved, wear particles and oil droplets are generated. The drive pins 60a and 70a can be smoothly moved while preventing the entry of foreign matter such as (lubricant), and the structure and manufacturing of the shielding members 90 and 90 can be simplified. .

Further, by using a thin film member made of a resin material as the shielding members 90, 90, the structure is simplified, the apparatus is thinned and miniaturized, and durability (wear resistance) is achieved. The drive pins 60a and 70a can be smoothly moved without exerting a load (resistance force) on the drive pins 60a and 70a.
Further, the region where the notches 91 and 91 overlap the buffer members 80 and 80 in the movement direction of the drive pins 60a and 70a, that is, the drive pins 60a and 70a abut on the buffer members 80 and 80 in the movement direction of the drive pins 60a and 70a. Therefore, when the drive pins 60a and 70a come into contact with the buffer members 80 and 80, there is no resistance of the shielding members 90 and 90, and the drive pins 60a and 70a are connected to the buffer pins 80a and 70a. It is possible to obtain a desired buffer action by reliably contacting the buffer members 80 and 80.

Next, the operation of the focal plane shutter will be described with reference to FIGS.
First, in a rest state after completion of the shutter operation (after completion of the exposure operation), as shown in FIG. 2, the leading blade drive member 60 rotates clockwise, and the drive pin 60a contacts the buffer member 80 and stops. At the same time, the leading blade 40 stops at a position where the opening 10a is opened, and the trailing blade driving member 70 rotates clockwise so that the driving pin 70a contacts the buffer member 80 and stops. 50 stops at the position where the opening 10a is closed.
In this state, as shown in FIG. 2, since the long holes 10 b and 10 c of the base plate 10 are shielded by the shielding members 90 and 90, from the movable member including the leading blade driving member 60 and the trailing blade driving member 70. It is possible to prevent foreign matters such as generated abrasion powder and oil droplets (lubricant) from entering the region where the leading blade 40 and the trailing blade 50 are disposed through the long holes 10b and 10c.

  Here, when a shutter operation preparation command is issued by a release operation or the like, the setting operation is performed by the setting member, and as shown in FIG. 1, the leading blade driving member 60 rotates counterclockwise to perform the shutter operation. It is positioned at the previous set position (a state where the leading blade 40 closes the opening 10a), and the trailing blade driving member 70 rotates counterclockwise to set the position before the shutter operation (the trailing blade 50 has the opening 10a). Next, when the electromagnet is energized, each attracted portion is attracted and the leading blade driving member 60 and the trailing blade driving member 70 are urged to rotate clockwise. It is held at the set position against the urging force. Then, the set member is returned to the rest position, and the state of restricting the clockwise rotation of the leading blade driving member 60 and the trailing blade driving unit 70 is released.

Subsequently, when the energization of one of the electromagnets is cut off at a desired timing, the leading blade driving member 60 rotates clockwise by the biasing force of the biasing spring as shown in FIG. In the long hole 10b, the notch 91 of the shielding member 90 is moved while being expanded to come into contact with the buffer member 80, and the leading blade 40 stops at a position where the opening 10a is opened.
Subsequently, when the energization of the other electromagnet is cut off at a desired timing, as shown in FIG. 1, the trailing blade driving member 70 rotates clockwise by the biasing force of the biasing spring, and the drive pin 70a is moved. In the long hole 10c, the notch 91 of the shielding member 90 is moved while being expanded to come into contact with the buffer member 80, and the rear blade 50 stops at a position where the opening 10a is closed.
As described above, the opening / closing operation of the opening 10a by the leading blade 40 and the trailing blade 50 is performed, and one shutter operation is completed.

During the shutter operation, the driving pin 60a of the leading blade driving member 60 moves while expanding the notch 91 of the shielding member 90 in the long hole 10b, and the shielding member 90 moves to the notch 91 after the driving pin 60a moves. Since the opposing edges are elastically restored so as to face each other and shield the long hole 10b, the drive pin 60a can be moved smoothly, and foreign matters such as wear powder and oil droplets (lubricant) can be moved through the long hole 10b. Prevent entry.
Similarly, the drive pin 70a of the rear blade drive member 70 moves while expanding the notch 91 of the shielding member 90 in the elongated hole 10c, and the shielding member 90 moves to the notch 91 after the drive pin 70a moves. Since the elastic recovery is performed so that the opposed edges closely face each other and the long hole 10c is shielded, the drive pin 70a can be moved smoothly, and foreign matter such as wear powder and oil droplets (lubricant) can be moved through the long hole 10c. Prevent entry.

  As described above, the long holes 10b and 10c of the base plate 10 are shield members 90 and 90 (here, fixed to the base plate 10 and relative to the drive pins 60a and 70a) that allow the drive pins 60a and 70a to move. Since it is shielded by a shielding member in which cuts 91 and 91 are formed so as to allow movement, wear powder generated from movable members including the driving members (the leading blade driving member 60 and the trailing blade driving member 70) It is possible to prevent foreign matters such as oil droplets (lubricant) from entering the region where the blade members (the leading blade 40 and the trailing blade 50) are disposed through the long holes 10b and 10c. It is possible to prevent foreign matter from adhering to the image sensor or the like disposed in

In the above embodiment, the shielding members 90 and 90 provided (fixed) on the main plate 10 are shown as the shielding members. However, the present invention is not limited to this, and the driving member (the leading blade driving member 60, the rear blade driving member 60) The driving pins 60a, 70a are provided on the driving pins 60a, 70a so as to move integrally with the driving pins 60a, 70a of the blade driving member 70), and the long holes 10b, 10c of the main plate 10 are always shielded on the back surface (or front surface) of the main plate 10. You may employ | adopt the shielding member which moves along.
In the said embodiment, although the shielding member 90,90 arrange | positioned and fixed to the back surface of the ground plane 10 was shown as a shielding member, it is not limited to this, It arrange | positioned and fixed to the surface side of the ground plane 10 You may employ | adopt a shielding member and may prevent a foreign material from approaching from the surface side of the ground plane 10 to the back surface side. In this case, foreign matter can be prevented from accumulating in the recesses of the long holes 10b and 10c.

In the above embodiment, the shielding members 90 and 90 provided with the cuts 91 and 91 to allow the movement of the drive pins 60a and 70a are shown as the shielding member, but are limited to this. Instead of the cuts 91, 91, a flexible shielding member that can be elastically deformed together with the drive pins 60a, 70a while being fixed to the base plate 10 so as to shield the long holes 10b, 10c is employed. May be.
In the above-described embodiment, the drive pins 60a and 70a having a cylindrical cross section are shown as the drive pins of the drive members (the leading blade driving member 60 and the trailing blade driving member 70). However, the present invention is not limited to this. As long as the desired mechanical strength is ensured, two concave grooves are provided on the outer peripheral surface of the columnar shape so that the edges of the cuts 91 of the shielding member 90 are inserted, and the cuts 91 are formed in the respective concave grooves. Alternatively, the drive pin may be moved relatively by inserting the edge of the.
In this case, since the amount of deformation by pushing and expanding the notch 91 is reduced, the gap generated between the notches 91 can be eliminated as much as possible, and the long holes 10b and 10c can be more reliably shielded.

  In the above-described embodiment, the front blade 40 and the rear blade 50 are provided as the blade members, and the drive pin 60a of the front blade drive member 60 is passed in the configuration including the front blade drive member 60 and the rear blade drive member 70 as the drive members. Although the case where the shielding member 90 is arranged in the long hole 10b and the shielding member 90 is arranged in the long hole 10c through which the driving pin 70a of the rear blade driving member 70 passes is shown, the present invention is not limited to this. In a configuration that includes one blade member and one drive member, and performs the shutter operation by simply moving the opening from the open state to the closed state, with respect to one long hole that passes the drive pin of one drive member A configuration in which the shielding member of the present invention is disposed may be employed.

  In the above-described embodiment, in a camera including a lens optical system, a focal plane shutter, an image sensor, and the like, the side on which the driving members (the leading blade driving member 60 and the trailing blade driving member 70) are disposed on the base plate 10 (here, the surface side) ) Is directed to the subject side in the optical axis direction of the lens optical system, and the side (rear surface side) on which the blade member (the front blade 40 and the rear blade 50) is disposed on the base plate 10 is the imaging element in the optical axis direction of the lens optical system. The configuration in which the shielding member 90 is disposed in the long holes 10b and 10c of the ground plane 10 on the premise of the configuration directed to the side is shown, but is not limited to this, and conversely, the driving member (the tip is connected to the ground plane 10). The side on which the blade driving member 60 and the rear blade driving member 70 are disposed (here, the front surface side) is directed to the imaging element side in the optical axis direction of the lens optical system, and the blade member (the front blade 40, the rear blade) is placed on the base plate 10. In the configuration roots 50) arranged side (back surface side) which is directed to the object side in the optical axis direction of the lens optical system, the present invention may be adopted to.

  As described above, the focal plane shutter of the present invention achieves the simplification of the structure, the thinning and the miniaturization of the apparatus, and the like, such as wear powder, oil droplets (lubricant), etc. that affect the image sensor. It can prevent foreign matter from entering the image sensor side from the long hole in the ground plane, and can capture higher-definition images, so it can be applied to digital cameras such as single-lens cameras, single-lens reflex cameras, mirrorless cameras, rangefinder cameras, etc. Needless to say, the present invention is also useful for an optical apparatus having an opening for exposure.

DESCRIPTION OF SYMBOLS 10 Base plate 10a Opening part 10b, 10c Long hole 20 Back plate 30 Intermediate plate 40 Lead blade (blade member)
50 Rear blade (blade member)
60 Leading blade drive member (drive member)
60a Drive pin 70 Rear blade drive member (drive member)
70a Drive pin 80 Buffer member 90 Shield member (film member)
91 notches

Claims (5)

A ground plate having an opening for exposure and a long hole, a blade member movably disposed on the back side of the ground plate to open and close the opening, and a surface side of the ground plate to drive the blade member A focal plane shutter having a drive pin that is freely arranged and has a drive pin connected to the blade member through the elongated hole,
A shielding member that shields the long hole of the ground plane while allowing the movement of the drive pin is provided ;
The base plate is provided with a buffer member that abuts the drive pin on one end side of the long hole,
The shielding member is provided on the base plate and has a notch that allows the drive pin to move,
The cut is formed up to a region overlapping the buffer member in the direction of movement of the drive pin.
A focal plane shutter characterized by that.   The drive pin has an elliptical shape that is long in the direction in which the cut extends.
The focal plane shutter according to claim 1.   The drive pin has two concave grooves for inserting the edge of the cut on a cylindrical outer peripheral surface.
The focal plane shutter according to claim 1. The blade member includes a front blade that opens the opening and a rear blade that closes the opening during shutter operation,
The driving member includes a leading blade driving member having a driving pin connected to the leading blade and a trailing blade driving member having a driving pin connected to the trailing blade,
The base plate has a long hole through which the driving pin of the leading blade driving member passes and a long hole through which the driving pin of the trailing blade driving member passes,
The shielding member is disposed so as to shield the long hole through which the driving pin of the leading blade driving member passes and the long hole through which the driving pin of the trailing blade driving member passes.
The focal plane shutter according to any one of claims 1 to 3 . The focal plane shutter according to any one of claims 1 to 4, and an image sensor disposed behind the focal plane shutter,
A camera characterized by that.

Images