Image pickup apparatus

1. An image pickup apparatus comprising:

an image sensor unit that includes a fixed unit and a movable unit movable relative to the fixed unit; and

a duct unit configured to form an air channel,

wherein the movable unit includes an image sensor and a heat exchanger, and

wherein at least part of the heat exchanger is inserted inside the duct unit through an opening of the duct unit.

2. The image pickup apparatus according to claim 1 , wherein the heat exchanger transfers heat generated by the image sensor.

3. The image pickup apparatus according to claim 1 , wherein the movable unit includes a first shielding member, and

wherein the first shielding member seals a channel from an internal space to an external space of the duct unit at the opening of the duct unit.

4. The image pickup apparatus according to claim 3 , wherein the first shielding member surrounds the heat exchanger and seals the channel from the internal space to the external space of the duct unit even where the movable unit is moved.

5. The image pickup apparatus according to claim 3 , wherein the first shielding member has a circular shape.

6. The image pickup apparatus according to claim 3 , wherein the fixed unit includes a second shielding member configured to slide relative to the first shielding member and to seal the channel from the internal space to the external space of the duct unit at the opening of the duct unit.

7. The image pickup apparatus according to claim 6 , wherein the second shielding member has a second opening through which the heat exchanger perforates, and

wherein the second opening has a circular shape.

8. The image pickup apparatus according to claim 1 , wherein the fixed unit includes a buffer that includes an elastic member configured to seal a channel from an internal space to an external space of the duct unit, and

wherein the elastic member is pressed against the duct unit while surrounding a periphery of the heat exchanger, and thereby seals the channel from the internal space to the external space of the duct unit.

9. The image pickup apparatus according to claim 1 , further comprising a main board that includes a controller,

wherein at least part of the duct unit overlaps each of the image sensor unit and the main board in an optical axis direction, and is disposed between the image sensor unit and the main board.

10. The image pickup apparatus according to claim 9 , wherein the duct unit includes a heat radiator,

wherein the heat radiator has a plurality of rib shapes extending along an airflow in the internal space of the duct unit, and protruding from the main board to the image sensor unit, and

wherein the heat radiator is disposed outside a movable range of the heat exchanger.

11. The image pickup apparatus according to claim 1 , wherein at least part of the heat exchanger inserted inside the duct unit has a cylindrical shape.

12. The image pickup apparatus according to claim 1 , wherein at least part of the heat exchanger that is not inserted inside the duct unit has a rib shape extending along an airflow in the internal space of the duct unit.

13. The image pickup apparatus according to claim 1 , wherein the heat exchanger has a first length in an optical axis direction in a first area including an optical axis, and a second length in the optical axis direction in a second area more distant from the optical axis than the first area, and

wherein the first length is longer than the second length.

14. The image pickup apparatus according to claim 1 , wherein the movable unit is movable in a direction orthogonal to an optical axis for an image stabilization.