JP6216604B2 - Focal plane shutter - 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 more particularly to a focal plane shutter that opens and closes an opening for exposure in a camera such as a digital single-lens camera or a mirrorless camera.

Digital single-lens cameras tend to be miniaturized, including recent mirrorless cameras, and of course, there is an increasing demand for miniaturization of focal plane shutters mounted on these cameras.
By the way, as a conventional focal plane shutter, a substantially rectangular base plate having an opening for exposure, a leading blade and a rear blade (blade member) formed movably with respect to the base plate to open and close the opening of the base plate, A shutter drive unit (blade drive mechanism) including a drive lever or the like disposed on one side of the base plate to drive the front blade and the rear blade, respectively, and the drive lever included in the shutter drive unit against the biasing force of the spring A device including a shutter charge unit (charge drive mechanism) including a motor, a gear, and the like to charge a charge position (set position) before the shutter operation is known (see, for example, Patent Document 1 and Patent Document 2). .
However, in the conventional focal plane shutter, a shutter charge unit (charge drive mechanism) including a motor and a plurality of gears is arranged on the outer side of a shutter drive unit (blade drive mechanism) disposed on one side of the main plate. Therefore, the focal plane shutter is widened and the outer contour is enlarged, so that it is difficult to mount the focal plane shutter on a recent camera that is required to be narrowed and downsized.

JP 2011-53273 A JP 2011-95687 A

  The present invention has been made in view of the above circumstances, and an object thereof is to include a base plate having an opening and movably supporting a blade member, a blade driving mechanism, a charge driving mechanism, and the like. In the configuration, it is possible to simplify the structure, reduce the thickness in the direction perpendicular to the main surface of the ground plane (shorten the thickness dimension), narrow the width (shorten the dimension in the width direction of the ground plane), etc. An object of the present invention is to provide a focal plane shutter that can be miniaturized and is suitable for mounting on a digital single-lens camera, mirrorless camera or the like that is required to be miniaturized.

The focal plane shutter of the present invention includes a ground plate having an opening for exposure, a blade member movably provided along the main surface of the ground plate for opening and closing the opening, and a unidirectional direction for driving the blade member. The biased drive member and the drive member that can be charged to the set position before the shutter operation against the biasing force, and biased to return to the rest position after the drive member is attracted and held by the electromagnet to the set position A focal plane shutter having a blade drive mechanism including a member and a charge drive mechanism for causing the set member to perform a charge operation, wherein the blade drive mechanism and the charge drive mechanism are arranged on one side of the ground plate, It is characterized by being arranged so as to overlap in a direction perpendicular to the main surface.
According to this configuration, when the set member is driven by the charge drive mechanism to perform the charge operation and the drive member (and the blade member) is charged (set) to the set position before the shutter operation, the drive member is set by the electromagnet. After being held in position, the set member is returned to the rest position by an urging force (such as a return spring), the mechanical restriction of the drive member is released, and the blade member travels (by turning off the energization of the electromagnet). An operation (exposure operation) is performed.
Here, on one side of the ground plate, the blade driving mechanism and the charge driving mechanism are arranged so as to overlap in a direction perpendicular to the main surface of the ground plate, that is, the ground plate and the blade driving mechanism that support the blade member movably. Since the charge drive mechanism has a three-layer structure laminated in a direction perpendicular to the main surface of the ground plane, the conventional charge drive mechanism is arranged outside the blade drive mechanism along the main surface of the ground plane. Compared to the case, the width can be reduced (the dimension in the width direction of the main plate can be shortened), the outer contour can be reduced as a whole, and the like can be easily mounted on a camera that requires a reduction in size.

In the above configuration, the charge drive mechanism includes a support plate disposed in parallel with the ground plate to support the blade drive mechanism in cooperation with the ground plate, the charge drive mechanism includes a drive motor, and a gear train that transmits the drive force of the drive motor; Includes an interlocking member that allows the set member to perform a charging operation in conjunction with the end gear of the gear train and allows the return to the rest position, and the gear train and the interlocking member are arranged along the support plate to be movably supported It is possible to adopt the configuration.
According to this configuration, the blade drive mechanism is arranged between the ground plate and the support plate, and the gear train and the interlocking member included in the charge drive mechanism are arranged and supported along the support plate (the main surface thereof). While suppressing the thickness dimension in the direction in which the base plate and the support plate are arranged (perpendicular to the main surface of the base plate), it is possible to achieve narrowing and downsizing. In addition, since the charge drive mechanism includes a drive motor, a gear train, and an interlocking member, it is possible to achieve downsizing by simplifying the structure, consolidating parts, and the like.

In the above-described configuration, the interlocking member includes a cam member that rotates integrally coaxially with the end gear, and a cam member that is swingably supported by the support plate and engages with the cam member to receive a cam action. A configuration including an engagement lever that engages with the portion can be employed.
According to this configuration, the driving force of the drive motor is transmitted to the set member via the engagement lever that receives the cam action of the cam member → the cam member that rotates integrally with the gear train → the end gear → the set member. The charging operation is performed, and the operation of allowing the set member to return to the rest position by an urging force (such as a return spring) is performed.
As described above, by adopting a cam member that rotates integrally with the end gear as an interlocking member and an engagement lever that is interposed between the cam member and the set member, the charge drive mechanism can be (A horizontal direction parallel to the surface), the layout can be moved within a range that does not protrude from the support plate.

In the above configuration, the set member is supported rotatably around an axis perpendicular to the main surface of the main plate and has an engagement pin that extends in a direction parallel to the axis and engages with the engagement lever. The plate may adopt a configuration having an escape portion that allows movement of the engagement pin.
According to this configuration, the ground plate and the support plate are arranged in a direction (perpendicular to the main surface of the ground plate) while achieving the integration of the parts by passing the engaging pin of the set member through the relief portion of the support plate. The thickness dimension can be suppressed.

In the above configuration, the drive motor has a drive gear and a rotation shaft that is oriented to extend in a direction perpendicular to the main surface of the ground plane, and supports the rotation shaft and is disposed in a region from the ground plane to the support plate. A configuration including a motor main body fixed to the support plate can be employed.
According to this configuration, the drive motor is oriented in the direction perpendicular to the main surface of the main plate and the motor body is disposed in the region between the main plate and the support plate. The support plate can be arranged along the main surface of the support plate, and the motor body can be arranged in an empty space in the area where the blade drive mechanism is arranged. , Shortening of the thickness dimension, miniaturization, etc. can be achieved.

In the above-described configuration, the support plate includes a cover plate that is arranged in parallel with the support plate and covers the gear train and the interlocking member, the support plate has a relief portion that receives the rotation shaft of the drive motor, and the cover plate is at least a drive gear of the drive motor. A configuration having a relief for receiving a portion can be employed.
According to this configuration, the drive motor has a thickness dimension (a dimension in a direction perpendicular to the main surface of the main plate) because the rotation shaft is passed through the relief portion of the support plate and the drive gear is received by the relief portion of the cover plate. Further shortening and the like can be achieved.

  According to the focal plane shutter having the above-described configuration, in a configuration including a base plate having an opening and supporting a blade member movably, a blade drive mechanism, a charge drive mechanism, etc., the structure is simplified and the main surface of the ground plate is provided. Thinning in the vertical direction (thickness dimension shortening), narrowing (shortening the dimension in the width direction of the ground plane), etc. can be achieved, and as a whole, the outer contour can be miniaturized, and miniaturization is required. A focal plane shutter suitable for a camera can be obtained.

It is a front view which shows one Embodiment of the focal plane shutter which concerns on this invention. It is a left view of the focal plane shutter shown in FIG. It is an external appearance perspective view of the focal plane shutter shown in FIG. FIG. 2 is an external perspective view showing a state where a cover plate is removed in the focal plane shutter shown in FIG. 1. In the focal plane shutter shown in FIG. 1, the support plate, the cover plate, and a part of the charge drive mechanism (gear train) are omitted, and the blade drive mechanism (drive member, set member) and the blade member are shown. FIG. 10 is a partial front view showing a state where the driving member (and the blade member) has completed the shutter operation (exposure operation). In the focal plane shutter shown in FIG. 1, the support plate, the cover plate, and a part of the charge drive mechanism (gear train) are omitted, and the blade drive mechanism (drive member, set member) and the blade member are shown. FIG. 10 is a partial front view showing a state in the middle of charging in which the drive member (and the blade member) is charged toward the set position. In the focal plane shutter shown in FIG. 1, the support plate, the cover plate, and a part of the charge drive mechanism (gear train) are omitted, and the blade drive mechanism (drive member, set member) and the blade member are shown. FIG. 6 is a partial front view showing a state of completion of charging in which a driving member (and a blade member) is charged to a set position. In the focal plane shutter shown in FIG. 1, the support plate, the cover plate, and a part of the charge drive mechanism (gear train) are omitted, and the blade drive mechanism (drive member, set member) and the blade member are shown. FIG. 10 is a partial front view showing a state before the start of the shutter operation (before the start of the exposure operation) after the drive member (and the blade member) is charged to the set position. In the focal plane shutter shown in FIG. 1, the operation of the charge drive mechanism (gear train, cam member, engagement lever) is shown, and the operation state corresponding to the state of completion of the shutter operation (exposure operation) shown in FIG. It is a partial front view shown. FIG. 7 is a partial front view showing the operation of the charge drive mechanism (gear train, cam member, engagement lever) in the focal plane shutter shown in FIG. 1 and showing the operation state corresponding to the state during charging shown in FIG. is there. FIG. 8 is a partial front view showing the operation of the charge drive mechanism (gear train, cam member, engagement lever) in the focal plane shutter shown in FIG. 1 and showing the operation state corresponding to the charge completion state shown in FIG. 7. is there. In the focal plane shutter shown in FIG. 1, the operation of the charge drive mechanism (gear train, cam member, engagement lever) is shown, and corresponds to the state before the start of the shutter operation (before the start of the exposure operation) shown in FIG. It is a partial front view which shows an operation state.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
As shown in FIGS. 1 to 5, the focal plane shutter according to this embodiment is parallel to the main plate 10 and the main plate 10 at a predetermined interval (in a direction L perpendicular to the main surface S of the main plate 10). The disposed support plate 20, the cover plate 30 disposed on the support plate 20 in the direction L perpendicular to the main surface S of the main plate 10, the leading blade 40 and the trailing blade 50 as the blade members, the leading blade 40 and the trailing blade Blade driving mechanism M1 for driving 50 (leading blade driving lever 60, main biasing spring 71 and slave biasing spring (not shown), rear blade driving lever 80, biasing spring 90, electromagnet 100, set member 110, biasing Spring 111, etc.), a charge drive mechanism M2 (drive motor 120, gear train 130, cam member 140, engagement lever 150, etc.) for charging the set member 110 included in the blade drive mechanism M1. To have.
The base plate 10 accommodates an intermediate plate (not shown) for defining a blade chamber for accommodating the leading blade 40 and the rear blade 50 on the side opposite to the side where the blade driving mechanism M1 and the charge driving mechanism M2 are arranged. A back plate 11 defining a blade chamber is fixed at a predetermined interval.

  The blade drive mechanism M1 is a main blade that rotates and urges the front blade drive lever 60 (the main drive lever 61, the sub drive lever 62, and the interlocking lever 63) as a drive member that drives the front blade 40 in a clockwise direction. A biasing spring (not shown) that biases the biasing spring 71 and the slave driving lever 62 counterclockwise, a trailing blade driving lever 80 as a driving member for driving the trailing blade 50, and the trailing blade driving lever 80 are clockwise. Two biasing springs 90 that rotate and energize around, a leading blade driving lever 60, and a trailing blade driving lever 80 (to-be-sucked portions 61c and 80c) are provided in correspondence with each other to exert a magnetic attractive force. The set member 110 and the set member 11 that can charge (set) the two electromagnets 100, the leading blade driving lever 60, and the trailing blade driving lever 80 to the set position before the shutter operation (before the exposure operation). And a biasing spring 111 such that the rotation urging toward the rest position.

  The charge drive mechanism M2 is integrally rotated coaxially with the drive motor 120, the gear train 130 (the first gear 131, the second gear 132, the second gear 133, the first gear 134, and the end gear 135) and the end gear 135. Cam member 140 as an interlocking member, engaging lever 150 as an interlocking member engaged with cam member 140 to receive a cam action and engage with a part (engaging pin 110d) of set member 110, engaging lever 150 The sensor 160 etc. which detect the position of are provided. The charge driving mechanism M2 causes the set member 110 to perform a charging operation via the drive motor 120 → the gear train 130 → the cam member 140 → the engagement lever 150.

As shown in FIGS. 1 to 5, the base plate 10 is formed in a substantially rectangular flat plate shape that defines a planar main surface S using a resin material or the like, and an opening 10a for exposure at the approximate center thereof. It has.
As shown in FIG. 5, the main plate 10 has support shafts 10 d and 10 e that are provided upright on the blade chamber side so as to rotatably support the opening 10 a, the arc-shaped long hole 10 b and the long hole 10 c, and the leading blade 40. The support shafts 10f and 10g which are erected on the blade chamber side so as to support the rear blade 50 so as to be rotatable, and the shaft which is opposite to the blade chamber side so as to support the front blade drive lever 60 so as to be rotatable. The support shafts 10h and 10i, the support shaft 10j provided on the opposite side to the blade chamber side to support the rear blade drive lever 80 so as to be rotatable, and the opposite side to the blade chamber side to support the set member 110 rotatably. A plurality of fixing portions 10m, etc., which are erected on the side opposite to the blade chamber side (fixed to the main surface S and projecting in the direction L), etc. It has.

As shown in FIGS. 2, 4, and 9, the support plate 20 is formed in a substantially rectangular flat plate shape using a resin material or the like, and is connected to one end side of the support shafts 10h, 10i, 10j, and 10k. The connecting portions 20a, 20b, 20c, 20d, the ratchet pawl 20e, the holding portion 20f that holds the two electromagnets 100, the escape portion 20g that allows the engaging pin 110d of the set member 110 to move freely, and the rotating shaft 121 of the drive motor 120. The escape portion 20h that is inserted and received, the fixing portion 20i that fixes the motor main body 123, the support shafts 20j, 20k, 20l, 20m, and 20n that rotatably support the gear train 130, and the engagement lever 150 are swingably supported. Supporting shaft 20p, a plurality of fixing portions 20q fixed to the fixing portion 10m of the base plate 10 with screws, a plurality of fixing portions 20r for fixing the cover plate 30 with screws, the sensor 1 And a fixed portion 20s or the like for fixing the 0.
Note that the ratchet pawl 20e, the holding portion 20f, and the like are separately formed integrally using a thin metal plate, and the metal plate may be fixed by being sandwiched between the fixing portion 10m of the base plate 10 and the support plate 20. Good. Here, a plate member formed using a resin material and a plate member formed using a metal plate are handled as one support plate 20.

As shown in FIGS. 1 and 3, the cover plate 30 is formed in a substantially rectangular flat plate shape, and includes a plurality of circular holes 30 a through which screws to be screwed into the fixing portions 20 r of the support plate 20, and the drive motor 120. An escape portion 30b opened to receive at least a part of the drive gear 122 fixed to the rotary shaft 121 is provided.
Here, the relief dimension 20 h for receiving the rotation shaft 121 of the drive motor 120 is provided on the support plate 20, and the relief dimension 30 b for receiving at least a part of the drive gear 122 of the drive motor 120 is provided on the cover plate 30. Shortening of the dimension (the dimension in the direction L perpendicular to the main surface S of the ground plane 10) can be achieved.

The leading blade 40 moves along the main surface S of the main plate 10, and as shown in FIG. 5, two blade main bodies 41, 42, 43 and two blade main bodies 41, 42, 43 are connected to each other. It comprises arms 44 and 45.
The arm 44 is rotatably supported by the support shaft 10 d, and a part of the arm 44 is connected to a drive pin 62 a of a slave drive lever 62 included in the leading blade drive lever 60.
The arm 45 is rotatably supported by the support shaft 10e.
Then, as shown in FIGS. 5 and 7, the arm 44 is driven downward (clockwise) by the leading blade driving lever 60, so that the three blade bodies 41, 42, and 43 overlap each other. The opening 10a is opened, and on the other hand, as shown in FIG. 8, the three blade bodies 41, 42, and 43 are developed by being driven upward (counterclockwise) by the leading blade drive lever 60. Thus, the opening 10a is closed.

The rear blade 50 moves along the main surface S of the main plate 10, and as shown in FIG. 5, two blade bodies 51, 52, 53 and two blade bodies 51, 52, 53 are connected to each other. It comprises arms 54 and 55.
The arm 54 is rotatably supported by the support shaft 10 f and a part thereof is connected to the drive pin 80 a of the rear blade drive lever 80.
The arm 55 is rotatably supported by the support shaft 10g.
Then, as shown in FIGS. 7 and 8, the arm 54 is driven upward (counterclockwise) by the rear blade drive lever 60, so that the three blade bodies 51, 52, 53 overlap. As shown in FIG. 5, the three blade bodies 51, 52, 53 are developed by being driven downward (clockwise) by the rear blade drive lever 60 as shown in FIG. Thus, the opening 10a is closed.

As shown in FIG. 5, the leading blade drive lever 60 includes a main drive lever 61, a slave drive lever 62, and an interlocking lever 63.
As shown in FIG. 5, the main drive lever 61 includes an engagement portion 61 a that engages with the slave drive lever 62, an engagement portion 61 b that is engaged with the set member 110 and exerts a rotational force counterclockwise, A portion 61c and the like are provided, are rotatably supported around the support shaft 10h, and are urged to rotate clockwise by the first urging spring 71.
As shown in FIG. 5, the sub drive lever 62 includes a drive pin 62 a to which the arm 44 is connected, an engagement portion 62 b that is detachably engaged with the engagement portion 61 a of the main drive lever 61, and an engagement of the interlocking lever 63. An engaging portion 62c and the like that are detachably engaged with the portion 63a are provided. The engaging portion 62c is rotatable about the support shaft 10h and follows the main drive lever 61 (less than the first biasing spring 71). It is urged to rotate counterclockwise by a second urging spring 72 (consisting of urging force).
The drive pin 62a is inserted into the long hole 10b of the main plate 10, and stops at the rotating end rotated clockwise in contact with a buffer member such as rubber fixed to the long hole 10b.
As shown in FIG. 5, the interlocking lever 63 includes an engaging portion 63a that releasably engages with the engaging portion 62c of the driven lever 62, an engaging portion 63b that engages with the engaging portion 110c of the set member 110, and the like. And is rotatably supported around the support shaft 10i.

The first urging spring 71 is a torsion coil spring, and is disposed around the support shaft 10 h as shown in FIGS. 2 and 5, and one end (not shown) is hooked on a part of the main drive lever 61. The other end (not shown) is fixed to the adjusting wheel (ratchet cylinder) 71a, which is rotatably arranged around the support shaft 10h and positioned by the support plate 20 (the ratchet pawl 20e), and is driven by the main drive. The lever 61 is formed so as to exert an urging force that urges the lever 61 to rotate clockwise in FIG.
The second urging spring is a tension spring, and one end (not shown) is hooked on a part of the leading blade 40 (the arm 44 or 45 thereof), and the other end (not shown) is hooked on the main plate. Since the drive pin 62a of the driven lever 62 is connected to the arm 44, the biasing force is applied to the driven drive lever 62 in a counterclockwise direction via the leading blade 40. .
Here, the urging force of the second urging spring is set to be smaller than the urging force of the first urging spring 71, that is, the slave driving lever 62 follows the main driving lever 61 that rotates counterclockwise. Thus, it is configured to rotate counterclockwise and to be rotated clockwise by being pushed by the main drive lever 61 that rotates clockwise.

As shown in FIG. 5, the rear blade drive lever 80 includes a drive pin 80a to which the arm 54 is connected, an engaging portion 80b to which the set member 110 is engaged and a rotational force is exerted counterclockwise, and a sucked portion 80c. Etc., and is rotatably supported by the support shaft 10j.
The drive pin 80a is inserted into the long hole 10c of the main plate 10, and stops at the rotating end rotated clockwise in contact with a buffer member such as rubber fixed to the long hole 10c.

  The urging spring 90 is a torsion coil spring, and is disposed around the support shaft 10j as shown in FIGS. 2 and 5, and one end (not shown) is hooked on a part of the rear blade drive lever 80. The other end (not shown) is rotatably arranged around the support shaft 10j and is hooked on an adjustment wheel (ratchet cylinder) 90a positioned by the support plate 20 (the ratchet pawl 20e) to drive the rear blade. The lever 80 is formed so as to exert an urging force that urges the lever 80 to rotate clockwise in FIG.

2 and 5, the electromagnet 100 is held by a holding portion 20f of the support plate 20, and is wound around a bobbin around the iron core member 101 having a predetermined length. And an exciting coil (not shown).
And, by energizing the coil, a line of magnetic force passing through the iron core member 101 is generated to exert a magnetic attractive force on the opposed attracted portions 61c and 80c.

As shown in FIGS. 4 and 5, the set member 110 is rotatably supported by a support shaft 10 k that defines an axis perpendicular to the main surface S of the main plate 10, and the main drive lever of the leading blade drive lever 60. The engagement portion 110 a that can be engaged with the engagement portion 61 b of 61, the engagement portion 110 b that can be engaged with the engagement portion 80 b of the rear blade drive lever 80, and the engagement that engages with the engagement portion 63 b of the interlocking lever 63 110c, an engagement pin 110d that is detachably engaged with the engagement portion 152 of the engagement lever 150, and the like.
The engagement pin 110d is formed so as to extend in a direction parallel to the axis of the support shaft 10k and to be inserted through the escape portion 20g of the support plate 20 without contact.

  The urging spring 111 is a torsion coil spring, and is arranged around the support shaft 10k as shown in FIGS. 4 and 5, with one end hooked to a part of the set member 110 and the other end ending. It is formed so as to be applied to a part of the main plate 10 so as to exert an urging force that urges the set member 110 to rotate counterclockwise in FIG.

  The set member 110 is moved to a rest position (exposure operation completed state shown in FIGS. 5 and 8) against the biasing force of the biasing spring 111 by the driving force exerted by the charge driving mechanism M2 (engagement lever 150). When rotating clockwise from the state before the exposure operation starts), the engaging portion 110a exerts a rotational force on the engaging portion 61b, the engaging portion 110b exerts a rotational force on the engaging portion 80b, and the engaging portion 110c is interlocked. A rotational force is exerted on the engaging portion 62c from the middle of rotation via the lever 63, and as shown in FIG. 7, the main drive lever 61 and the rear blade drive lever 80 are rotated by the respective biasing springs (71, 90). Rotate counterclockwise while resisting the force, disengage the driven drive lever 62 from the main drive lever 61 and rotate it clockwise to charge to the set position before the shutter operation (setting set) On the other hand, the main drive lever 61 and the trailing blade drive lever 80 (the attracted portions 61c and 80c thereof) are attracted and held by the electromagnet 100 at the set position, in conjunction with the operation of the charge drive mechanism M2. As shown in FIG. 8, when the biasing spring 110 rotates counterclockwise and returns to the rest position, the engaging portion 110a is disengaged from the engaging portion 61b and the engaging portion 110b is engaged. 80b, the engagement portion 110c releases the rotation bias of the engagement portion 62c exerted via the interlocking lever 63, and the driven drive lever 63 rotates counterclockwise by the biasing force of the second biasing spring. The leading blade 40 is allowed to close the opening 10a, and the leading blade driving lever 60 (the main driving lever 61 and the secondary driving lever 62) and the trailing blade driving lever 80 are allowed to rotate clockwise. .

As shown in FIGS. 1 to 4 and 9, the drive motor 120 is fixed to the rotating shaft 121 oriented to extend in the direction L perpendicular to the main surface S of the main plate 10, and to the tip of the rotating shaft 121. A driving gear 122, a motor main body 123 that supports the rotating shaft 121, and the like are provided.
Here, as shown in FIGS. 4 and 9, the rotating shaft 121 protrudes above the support plate 20 through the relief portion 20 h of the support plate 20, and rotates the drive gear 122 integrally at the tip portion thereof. Is fitted.
As shown in FIGS. 2 and 4, the motor main body 123 is arranged in a region extending from the base plate 10 to the support plate 20, and is fixed to the fixing portion 20 i of the support plate 20 with screws or the like.
As described above, the drive motor 120 has the rotation shaft 121 oriented in the direction L perpendicular to the main surface S of the main plate 10 and the motor main body 123 is disposed in the region between the main plate 10 and the support plate 120. The drive gear 122 and the gear train 130 can be arranged along the support plate 20 (the main surface thereof), and the motor main body 123 can be arranged in an empty space in the region where the blade drive mechanism M1 is arranged. Therefore, it is possible to achieve a reduction in width, a reduction in thickness dimension, a reduction in size, and the like as a whole by consolidating parts.

As shown in FIGS. 4 and 9, the gear train 130 includes a first gear 131, a second gear 132, a second gear 133, a first gear 134, and a terminal gear 135, and the support shaft 20 j, 20 k, 20 l, 20 m, and 20 n are rotatably supported and arranged along the main surface of the support plate 20.
A cam member 140 is formed on the end gear 135 so as to rotate integrally.
When the drive motor 120 rotates, the cam member 140 rotates while being decelerated via the drive gear 122 → the first gear 131 → the second gear 132, the second gear 133 → the first gear 134 → the end gear 135. .

As shown in FIGS. 9 to 12, the cam member 140 is integrally formed adjacent to the end gear 135 so as to rotate integrally coaxially with the end gear 135, and performs cam action on the engagement lever 150. It has come to affect.
As shown in FIGS. 4, 5, and 9 to 12, the engaging lever 150 is formed in a substantially L shape, and engages with the follower portion 151 that engages with the cam portion of the cam member 140 and the set member 110. An engaging portion 152 that engages with the mating pin 110d, a detected portion 153 that is detected by the sensor 160, and the like are provided, and are swingably supported by the support shaft 20p of the support plate 20 and on the main surface of the support plate 20. It is arrange | positioned under the terminal gear 135 so that it may follow.
As described above, according to the charge drive mechanism M2 including the drive motor 120, the gear train 130, the cam member 140, and the engagement lever 150, the drive force of the drive motor 120 is changed from the gear train 130 to the end gear 135. The cam member 140 that rotates integrally with the cam member 140 is transmitted to the set member 110 via the engaging lever 150 that receives the cam action of the cam member 140, and the set member 110 is charged and the set member 110 is biased. An operation for allowing the spring 111 to return to the rest position by the biasing force is performed.

Here, as the interlocking member, a cam member 140 that rotates integrally with the terminal gear 135 and an engagement lever 150 that is interposed between the cam member 140 and the set member 110 are employed, so that the charge driving mechanism M2 is A layout that can move within a range that does not protrude from the support plate 20 in the width direction of 10 (a horizontal direction parallel to the main surface S) can be obtained.
Further, the blade driving mechanism M1 is disposed between the base plate 10 and the support plate 20, and the gear train 130 and the interlocking members (the cam member 140 and the engagement lever 150) included in the charge drive mechanism M2 are the main surfaces of the support plate 20 ) Are arranged and supported along the vertical direction), and the width and the size of the base plate 10 and the support plate 20 are reduced while the thickness dimension in the direction L (perpendicular to the main surface S of the base plate 10) is suppressed. Furthermore, since the charge drive mechanism M2 is composed of the drive motor 120, the gear train 130, the interlocking members (140, 150), etc., the structure is simplified and the size is reduced by consolidating parts. Can also be achieved.

The sensor 160 is a transmissive optical sensor and is fixed to a fixing portion 20s of the support plate 20 as shown in FIG.
9 and 12, the sensor 160 detects that the set member 110 is in the rest position when the detected portion 153 of the engagement lever 150 is in a position facing the sensor 160. (In other words, a shutter operation completion position (exposure operation completion position) and a shutter operation start position (exposure operation start position) are detected).

  As described above, on one side of the base plate 10 (left side in FIG. 1), the blade driving mechanism M1 (the leading blade driving lever 60, the main biasing spring 71 and the slave biasing spring, the rear blade driving lever 80, and the attachment) And the charge drive mechanism M2 (drive motor 120, gear train 130, cam member 140, engagement lever 150, etc.) on the main surface S of the main plate 10. The ground plate 10, the blade driving mechanism M 1, and the charge driving mechanism M 2 that are arranged so as to overlap the vertical direction L, that is, movably support the blade members (40, 50), are on the main surface S of the ground plate 10. Compared with the case where a conventional charge drive mechanism is disposed outside the blade drive mechanism along the main surface of the main plate to form a three-layer structure laminated in the vertical direction L, FIG. 1 and FIG. As shown in 3 Provided is a focal plane shutter that can reduce the dimension W in the width direction of the main plate 10 (narrowing), reduce the outer contour as a whole, and can be easily mounted on a camera that requires downsizing. be able to.

Next, the operation of the focal plane shutter will be described with reference to FIGS. 5 to 8 and FIGS. 9 to 12. FIG.
First, in the rest state after completion of the shutter operation (after completion of the exposure operation), as shown in FIG. 5, the set member 110 rotates counterclockwise by the biasing force of the biasing spring 111 and is positioned at the rest position. The leading blade drive lever 60 rotates clockwise and stops (the main drive lever 61 rotates clockwise by the rotation biasing force of the main biasing spring 71, and the slave drive lever 62 resists the biasing force of the slave biasing spring. The leading blade 40 is pushed by the main drive lever 61 and rotates clockwise together with the main drive lever 61 to stop), and the leading blade 40 is located at a position where the opening 10a is opened, and the trailing blade driving lever 80 is The rear blade 50 rotates and stops clockwise by the rotational biasing force of the biasing spring 90, and the rear blade 50 is located at a position where the opening 10a is closed.
In this state, as shown in FIG. 9, the charge drive mechanism M2 allows the engaging lever 150 to rotate clockwise by the cam action of the cam member 140 and allow the set member 110 to return to the rest position. It is in a state.

Here, when a shutter operation preparation command is issued in response to a set operation command before the exposure operation, the drive motor 120 is activated, and the cam member 140 rotates clockwise via the gear train 130 as shown in FIG. The engagement lever 150 rotates counterclockwise under the cam action of the cam member 140 and rotates the set member 110 clockwise against the urging force of the urging spring 111 via the engagement pin 110d. Rotate to perform charging operation.
Then, as shown in FIG. 6, the clockwise rotation of the set member 110 causes the engaging portion 110 a to engage the engaging portion 61 b to resist the main drive lever 61 against the biasing force of the first biasing spring 71. And the counter driving lever 62 rotates counterclockwise so as to follow the main driving lever 61 by the urging force of the second urging spring, and the engaging portion 110b engages with the engaging portion 80b. Then, the rear blade drive lever 80 is rotated counterclockwise against the urging force of the urging spring 90, and the leading blade 40 is deployed so as to close the opening 10a, and the rear blade 50 opens the opening 10a. Begin to overlap to open.

  Then, as shown in FIG. 11, the rotation of the drive motor 120 causes the cam member 140 to further rotate clockwise via the gear train 130, and the engaging lever 150 receives the cam action of the cam member 140 to counterclockwise. When the set member 110 rotates further by a predetermined angle, the engaging portion 110b pushes the engaging portion 63b to further rotate the interlocking lever 63 counterclockwise, and the engaging portion 63a of the interlocking lever 63 engages with the engaging portion. As shown in FIG. 7, the driven blade 62 is rotated clockwise against the urging force of the second urging spring so that the leading blade 40 opens the opening 10 a again. Move to. Thereby, the charge operation (set operation) of the set member 110 by the charge drive mechanism M2 is completed.

Subsequently, when a shutter operation (exposure operation) command is issued by a release signal or the like, the electromagnet 100 is energized, and the iron core member 101 attracts the attracted portions 61c and 80c with a magnetic attractive force, and rotates clockwise. The main drive lever 61 and the trailing blade drive lever 80 are securely held and positioned at the set position against the urging force of the urging springs (71, 90) that are urged to rotate.
Subsequently, as shown in FIG. 12, the rotation of the drive motor 120 causes the cam member 140 to further rotate clockwise via the gear train 130, and the engagement lever 150 receives the cam action of the cam member 140 to rotate clockwise. , The set member 110 rotates counterclockwise by the biasing force of the biasing spring 111 and returns to the rest position, and the interlocking lever 63 also rotates clockwise following the rotation of the set member 110. The drive lever 62 rotates counterclockwise by the urging force of the second urging spring 72, and the leading blade 40 expands to close the opening 10a.
That is, as shown in FIG. 8, the leading blade driving lever 60 (and the leading blade 40) is positioned before the shutter operation (before the exposure operation is started) (the state in which the opening 10a is closed), and the trailing blade driving lever. 80 (and the rear blade 50) are positioned at the set position (opening portion 10a opened) before the shutter operation (before the exposure operation is started).

Thereafter, when the energization of the two electromagnets 100 is cut off at different desired timings, first, the leading blade drive lever 60 is rotated clockwise by the biasing force of the first biasing spring 71 and the leading blade 40 travels. At a predetermined time interval, the trailing blade driving lever 80 rotates clockwise by the biasing force of the biasing spring 90 and the trailing blade 50 travels, and as shown in FIG. And the rear blade 50 closes the opening 10a.
As described above, the opening and closing operation of the opening 10a is performed by the leading blade 40 and the trailing blade 50, and the shutter operation (exposure operation) is completed.

  As described above, in this embodiment, the blade driving mechanism M1 and the charge driving mechanism M2 are arranged on one side of the base plate 10 so as to overlap in the direction L perpendicular to the main surface S of the base plate 10 (that is, The base plate 10, the blade drive mechanism M 1, and the charge drive mechanism M 2 that movably support the blade members (40, 50) are stacked in a direction L perpendicular to the main surface S of the base plate 10. Therefore, compared with the case where the conventional charge driving mechanism is arranged outside the blade driving mechanism along the main surface of the ground plane, the width is narrowed (the dimension W in the width direction of the ground plane 10 is shortened), As a whole, the outer contour can be reduced in size, and can be easily mounted on a camera that is required to be downsized.

In the above embodiment, the charge driving mechanism M2 is overlapped with the blade driving mechanism M1 provided with the leading blade driving lever 60 and the trailing blade driving lever 80 that respectively drive the leading blade 40 and the trailing blade 50 as the blade driving mechanism. However, the present invention is not limited to this, for example, a blade drive for driving one blade member. The present invention can also be adopted in a configuration including a mechanism and a charge driving mechanism.
In the above-described embodiment, the case where the cam member 140 and the engagement lever 150 are employed as the interlocking member included in the charge driving mechanism has been described. However, the present invention is not limited to this, and rotates integrally with the terminal gear. A configuration in which the engaging pin 110d of the set member 110 is engaged with a member having a long groove (or slot) to be interlocked may be employed, or an interlocking member having another configuration may be employed.

  As described above, the focal plane shutter of the present invention has a simplified structure and a main plate main structure in a configuration including a base plate having an opening and supporting a blade member movably, a blade drive mechanism, a charge mechanism, and the like. A digital single-lens camera that can be thinned and narrowed in the direction perpendicular to the surface (reduced dimensions in the width direction of the ground plane), etc. It can be applied to a camera such as a mirrorless camera, and is also useful for other optical devices having an opening for exposure.

DESCRIPTION OF SYMBOLS 10 Ground plane 10a Opening part S Main surface L The direction perpendicular | vertical to the main surface of a ground plane 20 Support plate 20g Escape part 20h Escape part 20i Fixing part 30 Cover board 30b Escape part 40 Leading blade (blade member)
50 Rear blade (blade member)
M1 blade drive mechanism 60 leading blade drive lever (drive member)
61 Main drive lever 62 Subordinate drive lever 63 Interlocking lever 71 Main bias spring 80 Rear blade drive lever (drive member)
90 Biasing spring 100 Electromagnet 110 Set member 110d Engaging pin (part of set member)
111 Energizing spring M2 Charge drive mechanism 120 Drive motor 121 Rotating shaft 122 Drive gear 123 Motor main body 130 Gear train 135 Terminal gear 140 Cam member (interlocking member)
150 Engagement lever (interlocking member)

Claims (4)

A ground plane having an opening for exposure;
A blade member provided movably along the main surface of the main plate to open and close the opening,
The drive member urged in one direction to drive the blade member and the drive member can be charged to the set position before the shutter operation against the urging force, and the drive member is attracted and held at the set position by an electromagnet. A blade drive mechanism including a set member biased to return to the rest position after
A charge driving mechanism for causing the set member to perform a charging operation;
A support plate arranged in parallel to the ground plate to support the blade drive mechanism in cooperation with the ground plate;
A focal plane shutter with
The charge drive mechanism causes the set member to perform a charge operation in conjunction with a drive motor, a gear train that transmits a drive force of the drive motor, and a terminal gear of the gear train, and returns to the rest position. An interlocking member that allows
The gear train and the interlocking member are arranged so as to be along the support plate and are movably supported.
The interlocking member includes a cam member that rotates integrally coaxially with the terminal gear, and is supported by the support plate in a swingable manner so as to be engaged with the cam member and receive a cam action. An engagement lever that engages with a portion,
The set member includes an engagement pin that is rotatably supported about an axis perpendicular to the main surface of the main plate and extends in a direction parallel to the axis to engage the engagement lever.
The support plate has a relief portion that allows movement of the engagement pin,
The blade driving mechanism and the charge driving mechanism are arranged so that at least a part of the blade driving mechanism and the charge driving mechanism are overlapped in a direction perpendicular to the main surface of the ground plane on one side of the ground plane.
A focal plane shutter characterized by that.   The gear train of the charge drive mechanism and the interlocking member are arranged so as to overlap the set member of the blade drive mechanism and the direction perpendicular to the main surface of the ground plane,
The focal plane shutter according to claim 1. The drive motor has a drive gear and a rotation shaft oriented to extend in a direction perpendicular to the main surface of the main plate, and supports the rotation shaft and is disposed in a region extending from the main plate to the support plate. A motor body fixed to the support plate,
The focal plane shutter according to claim 1 , wherein the focal plane shutter is provided. A cover plate disposed in parallel with the support plate and covering the gear train and the interlocking member;
The support plate has a relief portion that receives the rotation shaft of the drive motor,
The cover plate has a relief portion that receives at least a part of the drive gear of the drive motor.
The focal plane shutter according to claim 3 .

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