Shutter apparatus, imaging apparatus, control method of shutter apparatus, and storage medium

1. A shutter apparatus comprising:

a shutter base plate having an opening:

a light shielding member movable to provide a closed state for closing the opening and an open state for opening the opening; and

at least one processor or circuit configured to perform operations of a control unit configured to control the light shielding member configured to reciprocate relative to the opening so as to move the light shielding member in a first direction for a forward exposure and in a second direction opposite to the first direction for a return exposure,

wherein the control unit varies an exposure correction amount of the light shielding member between the forward exposure and the return exposure.

2. The shutter apparatus according to claim 1 , wherein the control unit compensates a difference in exposure amount in a reciprocation of the light shielding member.

3. The shutter apparatus according to claim 1 , wherein the control unit makes different a moving trajectory between the forward exposure and the return exposure, which moving trajectory is a moving amount of the light shielding member from a reference position with time from reference time.

4. The shutter apparatus according to claim 3 , wherein the control unit makes different the moving trajectory by changing a speed at which the light shielding member passes the opening.

5. The shutter apparatus according to claim 3 , wherein the control unit changes different the moving trajectory by changing a standby time from the reference time to time at which the light shielding member starts moving.

6. The shutter apparatus according to claim 3 , wherein the control unit determines a change amount of the moving trajectory based on information on a pupil position of an imaging lens.

7. The shutter apparatus according to claim 6 , wherein the control unit changes the moving trajectory when a distance between the pupil position of the imaging lens and the light shielding member or the image sensor is shorter than a predetermined distance, and does not change the moving trajectory when the distance is longer than the predetermined distance.

8. The shutter apparatus according to claim 3 , further comprising a motor configured to drive the light shielding member,

wherein the control unit detects a position of the light shielding member or a member connected to the light shielding member, and performs a feedback control to change a voltage driving condition of the motor based on the difference between the position and the moving trajectory.

9. The shutter apparatus according to claim 8 , wherein the control unit determines an initial value of the voltage driving condition based on a temperature, an orientation of the shutter apparatus, or a last voltage driving condition.

10. The shutter apparatus according to claim 3 , wherein the light shielding member includes a first light shielding member and a second light shielding member, and

wherein the control unit controls, during the forward exposure, the first light shielding member with a first moving trajectory and moves the second light shielding member on the second moving trajectory, and

wherein the control unit controls, during the return exposure, the first light shielding member with a third moving trajectory and moves the second light shielding member on a fourth moving trajectory.

11. The shutter apparatus according to claim 10 , wherein the first moving trajectory and the fourth moving trajectory are different from each other.

12. The shutter apparatus according to claim 10 , wherein the second moving trajectory and the third moving trajectory are different from each other.

13. An imaging apparatus comprising:

a shutter apparatus; and

an image sensor configured to photoelectrically convert an optical image formed through an imaging optical system,

wherein the shutter apparatus includes:

a shutter base plate having an opening;

a light shielding member movable to provide a closed state for closing the opening and an open state for opening the opening; and

at least one processor or circuit configured to perform operations of a control unit configured to control the light shielding member configured to reciprocate relative to the opening so as to move the light shielding member in a first direction for a forward exposure and in a second direction opposite to the first direction for a return exposure,

wherein the control unit varies an exposure correction amount of the light shielding member between the forward exposure and the return exposure.

14. A control method of a shutter apparatus so as to move a light shielding member in a first direction for a forward exposure, and in a second direction opposite to the first direction for a return exposure, the control method comprising the steps of:

moving the light shielding member by a first exposure correction amount during the forward exposure; and

moving the light shielding member by a second exposure correction amount different from the first exposure correction amount during the return exposure.

15. A non-transitory computer-readable storage medium storing a program for causing a computer to execute a control method of a shutter apparatus control method so as to move a light shielding member in a first direction for a forward exposure, and in a second direction opposite to the first direction for a return exposure,

wherein the control method includes the steps of:

moving the light shielding member by a first exposure correction amount during the forward exposure; and

moving the light shielding member by a second exposure correction amount different from the first exposure correction amount during the return exposure.