Shutter device, imaging device

Abstract

To increase the degree of freedom related to adjustment of travel curve and curtain speed in a shutter device.SOLUTION: A shutter device has: a blade unit (2); a driving member (11) that is attached to the blade unit and drives the blade unit; deceleration means (15, 17, 21) that decelerate power from a motor (19); first connection means (15) that is connected with the deceleration means; second connection means (13) that is attached to the driving member at one end and attached to the first connection means at the other end; first position detection means (23) that detects passing through a predetermined position on a movement locus of the driving member or the first connection means; and second position detection means (25) that detects a relative difference from a result of detection performed by the first position detection means. The drive of the motor is controlled according to results of detection performed by the first detection means and second detection means.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a shutter device capable of closing and opening an aperture for exposure, and an imaging device including the shutter device.

Background Art

[0002] Conventionally, in a shutter device, a driving spring is wound up by a driving force of a motor or the like, and the state is held by an electromagnet or the like, and the blades constituting the shutter are caused to travel by the force of the driving spring that also releases this held state. This configuration is known.

[0003] For example, Patent Document 1 discloses an imaging device that converts the driving force of a motor into a reciprocating motion of a driving lever by a lever crank mechanism, winds up a driving spring by this motion, and causes blades to travel by the driving spring.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the technique proposed in Patent Document 1, in order to hold the state in which the driving spring is wound up, a separate adsorption holding mechanism is required, and the start timing of blade travel is restricted. Further, the shutter curtain speed and travel curve, which cause the blades to travel using the driving force of the spring as the main power, depend on the characteristics of the spring, and the curtain speed and travel curve cannot be freely adjusted.

[0006] Therefore, an object of the present invention is to improve the degree of freedom in adjusting the travel curve, curtain speed, etc. in a shutter device.

Means for Solving the Problems

[0007] To achieve the above object, the shutter device of the present invention includes a floor plate having an opening for exposure, a blade unit capable of switching between a state of closing the opening and a state of opening the opening, a drive member attached to the blade unit for driving the blade unit, a motor, a speed reduction means for reducing the power from the motor, a first connection means connected to the speed reduction means, a second connection means having one end attached to the drive member and the other end attached to the first connection means, a first position detection means for detecting passage through a predetermined position in the movement locus of the drive member or the first connection means, and a second position detection means for detecting a relative difference in the detection results with the first position detection means. The blade unit can be switched from the closed state to the open state by continuous rotation of the first connection means in a first direction of the first connection means. The driving of the motor is controlled according to the detection results of the first detection means and the second detection means. Position Position

Advantages of the Invention

[0008] According to the present invention, the degree of freedom in adjusting the running curve, curtain speed, etc. in the shutter device can be improved.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Embodiments for Carrying Out the Invention

[0010] Hereinafter, preferred embodiments of the present invention will be described in detail based on the accompanying drawings. FIG. 1 is a diagram exemplarily explaining blades and a drive unit of a shutter device 50 according to an embodiment of the present invention. FIG. 2 is a diagram exemplarily explaining the relationship between the angle of a crankshaft of a crank plate 15 and each phase in blade travel according to an embodiment of the present invention. FIG. 3 is a graph showing the relative angle relationship between the crank plate 15 and the main arm 2d of the blade. FIG. 4 is a diagram exemplarily explaining a shutter device including both a front curtain and a rear curtain according to an embodiment of the present invention. FIG. 5 is an exploded perspective view of a shutter device 50 according to an embodiment of the present invention. Note that the shutter device 50 is disposed inside the imaging device 100, and the exposure opening (hereinafter simply referred to as an opening) 1a provided in the base plate 1 of the shutter device 50 can be closed and opened in order to adjust the exposure state of an imaging element (not shown) included in the imaging device 100. In the optical axis direction, the base plate 1, the partition plate 6, the blade unit 2, the spacer 29, and the cover plate 8 are arranged in this order in the shutter device 50.

[0011] (First Embodiment) Hereinafter, with reference to FIGS. 1 to 5, the shutter device 50 according to the first embodiment of the present invention will be described.

[0012] The driving force of the motor 19 is transmitted directly or through a gear train to the crank plate 15. In this embodiment, a configuration is adopted in which a motor pinion 21 and an idler gear 17 are interposed between the motor 19 and the crank plate 15, but the crank plate 15 may be directly driven by the motor 19. The driving member 11 is a connecting means that is integrally rotatably attached to the main arm 2d, and one end of the dowel portion 11a and the connecting rod 13, which are arranged at positions offset from the rotation center portion, is rotatably attached. The other end of the connecting rod 13 is a connecting means that is rotatably attached to the crankshaft 15a of the crank plate 15. Each driving member for driving the blade unit 2 described above is positioned by the first holder member 9 and the second holder member 10.

[0013] FIG. 1(a) shows the blade unit 2 in a deployed state, and FIG. 1(b) shows the blade unit 2 in a folded (stored) state. The driving member 11 performs a so-called lever motion with these two states as the maximum displacement points respectively. In this case, the driving member 11 reciprocates like a seesaw with the dowel portion 11a connected to the connecting rod 13 as the force point, thereby displacing the state of the blade unit 2. The crank plate 15 is configured such that when the driving member 11 is located at the two maximum displacement points described above, the position of the crankshaft 15a is rotationally symmetric by 180 degrees. The mechanical elements described above are referred to as a lever-crank mechanism in this embodiment.

[0014] The shutter device 50 of this embodiment does not include a driving spring and an adsorption holding means that function as the main driving member during blade travel in a conventional shutter device. Although the biasing spring 4 biases the driving member 11 to a predetermined position for positioning, the biasing spring 4 does not apply a driving force related to blade travel to the driving member 11.

[0015] In addition, the shutter device 50 of this embodiment includes first position detecting means 23 for detecting a point on the movement locus of the driving member 11 and second position detecting means 25 capable of detecting the movement angle (rotation angle) of the motor 19, and this point is the difference from a conventional shutter.

[0016] In the shutter device 50 of this embodiment, the position serving as a reference for driving the drive member 11 can be determined based on the detection result of the first position detection means 23, and the amount of movement from the reference position can be obtained based on the detection result of the second position detection means 25. As shown in each figure of FIG. 1, it is desirable that the first position detection means 23 be installed avoiding the vicinity of both ends on the movement locus of the drive member 11. This is because near both ends, the change in the rotation angle of the drive member 11 is small with respect to the change in the rotation angle of the crank plate 15, and there is a possibility that a large error may occur in position detection due to a slight deviation or distortion of the drive member 11 or the first position detection means 23. Further, the second position detection means 25 shown in FIG. 5(a) is configured to generate a periodic pulse signal n times per rotation, for example, by a slit disk 27 described later attached to the motor 19, and also functions as a speed detection means with this configuration. With this configuration, by driving the motor 19, it becomes possible to move the slit forming portion 2f of the blade unit 2 and stop it at an arbitrary position. It is also possible to arbitrarily control the traveling speed of the slit forming portion 2f by adjusting the output of the motor. Note that the drive control of the shutter device 50 may be configured such that a control unit (for example, a CPU or the like) provided inside the imaging device 100 executes a predetermined program provided inside a memory (not shown).

[0017] In this lever-crank mechanism, the blade unit 2 is driven reciprocally once while the crank plate 15 makes one rotation. That is, by rotating the crank plate 15 once, a series of operations from the main traveling during exposure (blade traveling for acquiring a photographed image) to the return traveling (operation in which the blade moves from the state where the opening is closed after the main traveling to the open state) are completed. The positional relationship between the slit forming portion 2f of the blade and the angle position of the crank shaft 15a of the crank plate 15 is as shown in FIG. 2(a). The section where the slit forming portion 2f of the blade does not appear in the opening 1a which is the exposure opening can be used for acceleration or deceleration.

[0018] The rotation direction of the crank plate 15 can drive the blade unit 2 to reciprocate in either direction. However, the relationship between the rotation angle of the crank plate 15 and the rotation angle of the main arm 2d of the blade unit 2 does not match depending on the rotation direction. This is because the blade unit 2 driven by the toggle crank mechanism, unlike, for example, a slider crank mechanism, describes an arc trajectory rather than a straight line on the driven side (i.e., the blade unit 2 side).

[0019] FIG. 3 is a diagram for exemplarily explaining a graph showing the relationship between the rotation angle of the main arm 2d when the crank plate 15 is rotated. The cw indicated by the solid line in the figure shows the movement locus of the main arm 2d when the crank plate 15 is rotated in the cw direction (clockwise) from the state shown in FIG. 1(a). Also, the ccw indicated by the dashed line in the figure shows the movement locus of the main arm 2d when the crank plate 15 is rotated in the ccw direction (counterclockwise) from the state shown in FIG. 1(a). Note that the dotted line in the figure exemplifies an ideal cosine curve. When the crank plate 15 continues to rotate in one direction, the rotation direction of the main arm 2d will periodically alternate between the cw direction and the ccw direction.

[0020] Here, as shown in FIG. 3, it can be seen that in the section where the rotation direction of the main arm 2d matches the rotation direction of the crank plate 15, the main arm 2d follows a trajectory close to an ideal COS curve. On the other hand, when the rotation direction of the main arm 2d is opposite to the rotation direction of the crank plate 15, the movement locus of the main arm 2d greatly deviates from the ideal COS curve. That is, during one rotation of the crank plate 15, the running curve of the blade will alternately show a trajectory close to an ideal COS curve and a trajectory with a large deviation. The former trajectory is close to a straight line and has symmetry between the first half and the second half of the rotation of the crank plate 15, so it is suitable for the running curve during this exposure using the blade unit 2. Also, since the trajectory is close to a straight line, it is easy to adjust even when intentionally accelerating or decelerating the motor to shape the running curve of the blade unit 2.

[0021] As described above, it is preferable to control so that the rotation direction of the main arm 2d during the blade running of the blade unit 2 during exposure coincides with the rotation direction of the crank plate 15. In other words, it is preferable that the section where the rotation direction of the main arm 2d of the blade unit 2 coincides with the rotation direction of the crank plate 15 is set as the blade running area of the blade unit 2.

[0022] Also, although a configuration is adopted in which a motor pinion 21 and an idle gear 17 are interposed between the motor 19 and the crank plate 15, the motor pinion 21 and the crank plate 15 may be meshed and driven. That is, any form may be adopted as long as it is a configuration capable of reducing the power of the motor 19 and transmitting it to the crank plate 15.

[0023] The purpose of reducing the power of the motor 19 is to reduce the load on the motor 19 and improve the driving efficiency of the motor 19. As the shutter device 50 of the present invention, in order to quickly accelerate and obtain the required curtain speed, it is preferable that the drive motor has a low inertia. However, generally, the lower the inertia of the motor, the smaller the torque, and there is a risk that the driving efficiency will decrease, and the overall current consumption will increase. Therefore, as described above, by appropriately reducing the power of the motor 19, the driving ratio in the high-efficiency region can be increased, and the current consumption of the motor 19 can be reduced.

[0024] Note that, generally, the reduction ratio of the gears is set to an irrational number to avoid a situation where specific portions repeatedly mesh, and it is expected that the gears will wear evenly. However, in the shutter device 50 of the present embodiment, the reduction ratio is set to an integral multiple. With this configuration, the starting angle of the motor 19 at the start of travel can always be made the same, and furthermore, the meshing portions of the gears of each gear from the start of travel to the stop are the same. Therefore, the shutter device 50 of the present embodiment can stabilize the travel of the blade unit 2 without the drive angle of the motor 19 and the meshing conditions of each drive gear differing for each travel, and can reduce variations in the curtain speed and exposure. Note that, for both the case where the motor pinion 21 directly meshes with the crank plate 15 and the case where an idler gear 17 is interposed therebetween, the reduction ratio by each gear may be adjusted so as to be an integral multiple.

[0025] (Drive sequence of shutter device 50) Next, the drive sequence of the shutter device 50 will be described. When actually driving the blade unit 2, it is necessary to grasp the current position of the slit forming portion 2f. As described above, a series of operations from the main travel at the time of exposure to the return travel and the breakdown of each phase can be represented as shown in FIG. 2, but it is desirable to be able to grasp in advance the angle information when the slit forming portion 2f is at the main control target position. For example, the reference position O is acquired by the first position detection means 23, and information regarding relative angles such as the travel start position A, the original position B, the end position C, and the stop limit position D is acquired in advance by the second position detection means 25 with respect thereto.

[0026] The traveling start position A is the position that serves as the start reference when starting the travel of the blade unit 2 during exposure. Therefore, the traveling start position A is set to an optimal acceleration section in order to achieve a predetermined traveling speed (curtain speed) of the blade unit 2, and is set within the acceleration section shown in FIG. 2 so that so-called light leakage does not occur at the opening 1a before the travel of the blade unit 2. Note that the motor 19 according to the present embodiment has cogging torque, and the shaft angle of the motor that naturally stops due to the cogging torque may coincide with the above-described traveling start position A. The original position B is the reference position for starting exposure using the blade unit 2, and is set near the end (opening end) of the opening 1a on the side where exposure is started (the upstream side in the traveling direction of the blade unit 2). The end position C is the reference position for ending exposure using the blade unit 2, and is set near the end (opening end) of the opening 1a on the side where exposure ends (the downstream side in the traveling direction of the blade unit 2). The stop limit position D is the stop limit position of the blade unit 2, and is set within the deceleration / stop section shown in FIG. 2 so that the light shielding of the opening 1a is released again after the exposure ends and unnecessary exposure does not occur.

[0027] As shown in FIG. 2, as the position of the slit forming portion 2f corresponding to the crank plate 15, the time from starting the travel from the traveling start position A, passing through the original position B, and then passing through the end position C corresponds to the curtain speed of the blade unit 2. As the curtain speed, it is desirable that the traveling speed of the blade unit 2 in the traveling direction is constant and is controlled to approach the target value (ideal value). Regarding the control of the curtain speed, a method of adjusting a curve (referred to as a traveling curve) showing the relationship between the traveling position of the blade and the traveling time is known. In the present embodiment, a rotary encoder (not shown) is provided as detection means for detecting the rotation of the output shaft of the motor 19, and the rotation speed of the motor 19 and the displacement amount from the origin position can be obtained.

[0028] Therefore, in this embodiment, the running curve of the ideal blade unit 2 is recorded in advance inside the imaging device 100, and the difference between the curve during the actual running of the blade unit 2 output from the rotary encoder and the ideal curve is detected. Then, by adjusting the output of the motor 19 so as to reduce the difference, the running curve of the blade unit 2 can be controlled to approach the ideal running curve.

[0029] Also, regarding the return running, it is an operation of returning the drive member from the stop position to the running start position. Generally, it is necessary to reverse the rotation direction of the drive member, such as by changing the rotation direction of the motor. On the other hand, the crank plate 15 according to this embodiment only needs to rotate in the same direction as the actual running even during the return running, so it can return to the running start position A with a short movement amount.

[0030] Note that the return running is an operation that has no direct relation to the main exposure, so it is not necessary to precisely control the running speed and running time of the blade unit 2 related to the return running. Therefore, for example, by lowering the output of the motor 19 during the return running, the current consumption per series of operations (1 sequence) of the blade unit 2 can be significantly reduced.

[0031] The case of operating a single blade unit 2 has been described above for simplicity. In this case, for example, it can be applied to the so-called electronic front curtain shutter drive that controls the front curtain by resetting (or reading) the sensor. Also, as the shutter device 50 described above, as shown in FIG. 4, it is also possible to make the blade unit 2 function as the front curtain and the blade unit 3 function as the rear curtain. In this case, the drive mechanisms of the respective blade units can operate independently, and the respective blade units and drive mechanisms are arranged in a symmetrical orientation. For each blade unit, control may be performed so as to perform the operation based on the mechanism described above. For example, a configuration in which the respective drive members and blade units are arranged to be line-symmetrical with respect to a line passing through the center of the aperture 1a and parallel to the long side direction (longitudinal direction) of the aperture 1a (that is, a line that divides the aperture 1a vertically) is sufficient.

[0032] (Regarding the LV continuous shooting sequence) When performing the operation of inserting a so-called live view display during continuous shooting (referred to as LV continuous shooting) as described below, as the state of the shutter device 50, it is necessary to prepare a state (LV phase) in which the aperture 1a is opened between two consecutive main exposures (main runs) (between shooting frames). As described above, the shutter device 50 according to the present embodiment can drive two different vane units (front curtain and rear curtain) independently. Therefore, after reading out the imaging (image) data of a certain frame, by only performing the return run of the vane unit on the rear curtain side, a state in which the aperture 1a is opened can be realized. And immediately after imaging, since the slit forming portion 2f of the vane unit (rear curtain side) is located at the stop limit position D, the aperture 1a can be quickly opened by simply rotating the motor in the same direction and moving it to the travel start position A.

[0033] To shift to the travel standby state after the end of the LV phase of the shutter device 50, the vane unit 2 corresponding to the front curtain is returned from the stop limit position D to the travel start position A. By performing the operations described above, both the vane units for the front curtain and the rear curtain will stay at the travel start position A, and the transition to the next imaging frame can be made immediately.

[0034] (Regarding the state of the shutter device 50 when the power is off) The state of the shutter device 50 when the power of the imaging device 100 is off will be described below. It is assumed that power is not supplied to the motor 19 of the shutter device 50 when the power of the imaging device 100 is off.

[0035] As described above, the lever crank mechanism reciprocally drives the drive member 11 by rotating the crank plate 15. On the other hand, it is also possible to operate the crank plate 15 by applying a force to the drive member 11 side. However, when operating the stationary crank plate 15, the load related to the operation of the crank plate 15 varies according to the position of the drive member 11. For example, when the drive member 11 is positioned around the middle of the reciprocating movement track, it is impossible to operate the crank plate 15 with a small force. On the contrary, when the drive member 11 is positioned near the top dead center or bottom dead center of the reciprocating movement, a large load is required to operate the crank plate 15. In other words, when the drive member 11 is positioned near the top dead center or bottom dead center of the reciprocating movement, the drive member 11 will not move easily unless a force is applied from the crank plate 15 side. Utilizing this feature, even when the power of the imaging device 100 is turned off, the opening 1a can be maintained in the open state and the light-shielded state (closed state) by the blade unit 2.

[0036] For example, when it is desired to maintain the opening 1a in the open state when the power of the imaging device 100 is turned off, in response to the instruction to turn off the power of the imaging device 100, the motor 19 is driven, and after moving the blade unit 2 to the position where the opening 1a is opened, the power is turned off. Also, for example, when it is desired to maintain the opening 1a in the light-shielded state when the power of the imaging device 100 is turned off, in response to the instruction to turn off the power of the imaging device 100, the motor 19 is driven, and after the opening 1a is shifted to the light-shielded state by the blade unit 2, the power is turned off. With this configuration, in the shutter device 50 according to the present embodiment, it is possible to easily maintain the light-shielded state or the open state by the blade unit 2 in the power-off state of the imaging device.

[0037] As described above, the shutter device 50 according to the present embodiment adopts a lever crank mechanism, so that it is possible to suppress a decrease in the degree of freedom regarding the adjustment of the curtain speed and the running curve without requiring other mechanisms such as a drive member such as a drive spring and a suction holding mechanism for the blades.

[0038] (Second Embodiment) Next, a second embodiment of the shutter device 60 according to the present invention will be described. Note that the shutter device 60 according to the present embodiment is different from the shutter device 50 described in the above-described first embodiment in that it includes a restricting member 31, but has the same configuration otherwise, and the same names and reference numerals are used for each part.

[0039] In the present embodiment, in order to suppress light leakage before the main travel of the blade unit 2 and unnecessary re-exposure after the main travel, the movement of the crank plate 15 is restricted to a predetermined range by the restricting member 31. FIG. 6 is a partial external perspective view of the drive mechanism of the blade unit 2 according to the second embodiment of the present invention. As shown in FIG. 6, the protruding portion 31a of the restricting member 31 is arranged so as to abut against the protruding portion 15b of the crank plate 15 in the rotational direction of the crank plate 15. As the rotational phase of the crank plate 15 at which the protruding portion 15b and the protruding portion 31a abut, the restricting member 31 is arranged so as to be in the range corresponding to the return travel in FIG. 2. That is, when the protruding portion 15b and the protruding portion 31a interfere with each other, the position of the slit forming portion 2f cannot be between the stop limit position D and the travel start position A, but the sections for main travel, acceleration, and deceleration can be ensured in the same manner as in the first embodiment described above. With this configuration, it is possible to prevent light leakage and re-exposure due to unexpected rotation of the crank plate 15.

[0040] On the other hand, in the present embodiment, as in the first embodiment described above, it is not possible to complete a series of operations from the main travel to the return travel of the blade unit 2 by rotating the crank plate 15 in the same direction. Specifically, in the shutter device 60 of the present embodiment, after the main travel of the blade unit 2, it is necessary to rotate the motor 19 in the direction opposite to the main travel to reverse-rotate the crank plate 15 and return it to the travel start position.

[0041] In the shutter device 60 of the present embodiment, since it is necessary to rotate the motor 19 and the crank plate 15 in the reverse direction during the return travel, the time required for the return travel is longer than that of the shutter device 50 of the first embodiment described above. However, generally, for the return travel of the shutter device, as described above, high-precision position control is not required, the motor can have a low output, and there is a large time margin for completing the operation. Therefore, the influence on the imaging operation of the subject using the shutter device 60 is small. That is, the shutter device 60 of the present embodiment can suppress a decrease in the degree of freedom regarding the adjustment of the shutter speed and the travel curve while preventing unnecessary exposure.

[0042] Regarding the maintenance of the state of the blade unit 2 when the imaging device 100 is powered off, in addition to the configuration of the first embodiment described above, the shutter device 60 of the present embodiment is different in that it can prevent movement due to an external force even when the drive member 11 is away from near each dead point of the reciprocating movement. Specifically, in the shutter device 60 of the present embodiment, the configuration of the motor 19 is a drive source having cogging torque with an iron core in the armature. And between the motor 19 and the crank plate 15, by means of a speed reduction means such as an idle gear 17, in order to move the crank plate 15 from the drive member 11 side, the speed increases in reverse, and a force obtained by multiplying the cogging torque of the motor 19 by the speed reduction ratio is required. With this configuration, the shutter device 60 of the present embodiment can be configured to be less likely to move by an external force to the drive member 11 side even at a position deviated from each dead point in the reciprocating drive of the drive member 11 compared to the shutter device 50 of the first embodiment described above. For example, in the range from near both dead points in the reciprocating movement of the drive member 11 to the contact position with the restricting member 31, the movement of the drive member 11 due to an external force to the drive member 11 side can be restricted. That is, as the state of the blade unit 2 when the imaging device 100 is powered off, the shutter device 60 of the present embodiment can maintain the open state or the closed state of the aperture 1a even if the position accuracy regarding the control of each drive member is lower than that of the first embodiment described above.

[0043] As described above, the preferred embodiments of the present invention have been explained. However, the present invention is not limited to these embodiments, and various modifications and changes are possible within the scope of the gist thereof. For example, in the above-described embodiment, as a drive mechanism for adjusting the exposure amount at the time of subject imaging related to the shutter device, the configuration adopting the lever crank mechanism has been described, but the present invention is not limited thereto. For example, the above-described shutter device may be applied to a light shielding device that is not related to the adjustment of the exposure amount at the time of subject imaging. In this case, while adjusting the exposure amount at the time of subject imaging using the so-called electronic shutter function, the above-described shutter device may be used as a light shielding device for protecting the imaging sensor included in the imaging device 100 from sunlight and dust.

Explanation of Signs

[0044] 1 Floor 1a Opening 2 Blade Unit 2d Blade Main Arm 2f Slit Forming Portion 3 Blade Unit (Rear Curtain) 4 Slack Spring 6 Partition Plate 8 Cover Plate 9 First Holder Member 10 Second Holder Member 11 Driving Member 13 Link Arm 15 Crank Plate 17 Idler Gear 19 Motor 21 Motor Pinion 23 First Position Detection Means 25 Second Position Detection Means 27 Slit Disk 29 Spacer 31 Regulation Member

Claims

1. A floor having an opening for exposure, a blade unit capable of switching between a state of closing the opening and a state of opening the opening, a drive member attached to the blade unit for driving the blade unit, a motor, a speed reduction means for reducing the power from the motor, a first connection means connected to the speed reduction means, a second connection means having one end attached to the drive member and the other end attached to the first connection means, a first position detection means for detecting passage through a predetermined position in the movement locus of the drive member or the first connection means, a second position detection means for detecting a relative difference from the first position detection means, and having, the blade unit can be switched from the closed state to the open state by continuous rotation of the first connection means in the first direction, A shutter device, characterized in that the driving of the motor is controlled according to the detection results of the first position detection means and the second position detection means.

2. The shutter device according to claim 1, wherein the reduction ratio of the speed reduction means is an integral multiple.

3. The blade unit can be switched from the closed state to the closed state again via the main travel when imaging a subject by continuous rotation of the first connection means in the first direction. The shutter device according to claim 1 or 2, characterized in that it can be switched.

4. The blade unit can operate when continuously imaging a subject only by continuous rotation of the first connection means in the first direction. The shutter device according to claim 3, characterized in that it can.

5. A regulating member for regulating the rotation angle of the first connection means is provided, The regulating member regulates the movement of the first connection means in the first direction for shifting from the closed state after the main travel of the blade unit to the open state. The shutter device according to claim 3, characterized in that it does.

6. The first connection means is a rotatable crank, The second connection means is an arm, and moves in a certain locus by the rotation of the first connection means, The drive member can reciprocate according to the movement of the second connection means. The shutter device according to any one of claims 1 to 5, characterized in that it can.

7. The shutter device according to claim 6, wherein the first position detection means is arranged at a position different from the vicinity of the dead point in the reciprocating movement of the drive member. **Claim 8** The shutter device according to any one of claims 1 to 7, wherein the second position detection means can detect the rotation angle of the motor. **Claim 9** The shutter device according to claim 1, wherein the motor has cogging torque, and the shaft angle at which the motor naturally stops due to the cogging torque coincides with the travel start position. **Claim 10** An imaging device including the shutter device according to any one of claims 1 to 9.

Images