Abstract: A foldable electronic device including a first body, a second body, a hinge module, and a cover is provided. The hinge module is connected to the first body and the second body, such that the first body and the second body are rotated relatively to be folded or unfolded via the hinge module. The hinge module has a protruding rod eccentric to a rotation center of the hinge module. The cover is pivoted to the second body and located on a moving path of the protruding rod. The hinge module drives the cover to be rotated relative to the second body via the protruding rod.

Abstract: A foldable electronic device, including a first body, a second body, an air valve movably disposed in the first body, at least one triggering member, and a hinge connecting the first body and the second body, is provided. The first body has multiple openings respectively located at two opposite surfaces. The triggering member is movably disposed in the first body and has a part exposed outside the first body. The air valve and the triggering member are mutually on moving paths of each other. The first body and the second body are rotated to be folded or unfolded relative to each other by the hinge. A part of the triggering member is suitable for bearing a force such that the triggering member drives the air valve, so that the air valve opens or closes the openings.

Abstract: An optical measurement stability control system includes a case, a circulating flow field, an optical measurement system and a heat dissipation flow field. The case has an airtight space. The circulating flow field is located in the airtight space and adapted to generate an airflow flowing in the airtight space. The optical measurement system is located in the airtight space and located on a flow path of the airflow. The heat dissipation flow field is connected to the case and located at an end of the flow path. The heat dissipation flow field discharges heat out of the airtight space by heat conduction and forced convection.

Abstract: An optical measurement stability control system includes a case, a circulating flow field, an optical measurement system and a heat dissipation flow field. The case has an airtight space. The circulating flow field is located in the airtight space and adapted to generate an airflow flowing in the airtight space. The optical measurement system is located in the airtight space and located on a flow path of the airflow. The heat dissipation flow field is connected to the case and located at an end of the flow path. The heat dissipation flow field discharges heat out of the airtight space by heat conduction and forced convection.