Abstract: An optical system affixed to an electronic apparatus is provided, including a first optical module, a second optical module, and a third optical module. The first optical module is configured to adjust the moving direction of a first light from a first moving direction to a second moving direction, wherein the first moving direction is not parallel to the second moving direction. The second optical module is configured to receive the first light moving in the second moving direction. The first light reaches the third optical module via the first optical module and the second optical module in sequence. The third optical module includes a first photoelectric converter configured to transform the first light into a first image signal.

Abstract: A control switch for a fire extinguisher in the present invention has a spring placed between a handle and an operating lever and pivoted by a pivot axle; a change-over switch pivoted within a through hole formed in the operating lever, by which the change-over switch can be changed over in an ON position and become vertical so that a press-in valve stem can be pressed by a bottom of the change-over switch to open a valve seat to inject a fire-extinguishing agent for extinguishing fire when the operating lever is pressed downward; the change-over switch can be changed over in an OFF position and become slanted so that the press-in valve stem can not be pressed and actuated by the bottom of the change-over switch even if the operating lever is pressed downward, thereby achieving an effect of safety control to the fire extinguisher and being convenient in operation.