Imaging apparatus

1. An imaging apparatus comprising:

a lens attachment portion to which a lens is attached;

an image sensor on which light transmitted through a lens attached to the lens attachment portion is incident;

a heat transfer member configured to support the image sensor and to absorb heat of the image sensor;

a main frame including a duct in which outside air flows and provided with a through hole through which a part of the heat transfer member passes;

a fan arranged in the duct;

a front frame configured to support the lens attachment portion and the heat transfer member and to be attached to the main frame; and

a seal member configured to block a flow of outside air from inside the duct toward the image sensor through the through hole.

2. The imaging apparatus according to claim 1 , wherein the seal member seals a gap between the heat transfer member passed through the through hole and an inner peripheral surface of the through hole.

3. The imaging apparatus according to claim 2 , wherein the seal member is made of an elastic material, and includes an annular base portion fixed to an opening edge of the through hole outside the duct, and a funnel-shaped seal portion extending from the base portion and entering the through hole.

4. The imaging apparatus according to claim 1 , wherein the heat transfer member includes:

a radiator plate supporting the image sensor and arranged outside the duct, and

a heat sink provided on the radiator plate, passing through the through hole of the duct, and partially exposed in the duct.

5. The imaging apparatus according to claim 1 , wherein the heat transfer member is supported by the front frame via an adjustment mechanism configured to adjust inclination of the image sensor with respect to the lens attachment portion, and is spaced apart from the main frame.