Abstract: Provided are an imaging optical system capable of increasing a field of view and a display apparatus. The imaging optical system includes a flat lens and a reflection assembly. The flat lens includes two groups of optical waveguide arrays. The reflection assembly has at least one pair of reflection surfaces. Two reflection surfaces in a same pair are located at an image source side and a viewing side of the flat lens, respectively. An angle between each reflection surface and the flat lens is smaller than or equal to 90 degrees. Angles between each of the two reflection surfaces in the same pair and the flat lens are equal, and intersection lines of each of the two reflection surfaces in the same pair and the flat lens are parallel to each other.

Abstract: The present invention relates to internal combustion engines, and discloses a double-cylinder internal combustion engine. The double-cylinder internal combustion engine of the present invention adopts a curved groove ball bearing mechanism to replace crank-connecting rod mechanisms since traditional internal combustion engines have a complicated structure, high material requirements, high processing difficulty, and the inertia effect and noises thereof are hard to be eliminated. Two inner rings of the curved groove ball bearing mechanism are fixedly connected, and a valve mechanism and an ignition mechanism are driven through a gear pair, so that the two sets of cylinders and pistons reciprocate in opposite directions to automatically balance reciprocating inertia thereof. Compared with the prior art, the present invention has simple motion forms which only consist of the rotary motion and the reciprocating motion, and low noises are produced.

Abstract: The present invention relates to internal combustion engines, and discloses a double-cylinder internal combustion engine. The double-cylinder internal combustion engine of the present invention adopts a curved groove ball bearing mechanism to replace crank-connecting rod mechanisms since traditional internal combustion engines have a complicated structure, high material requirements, high processing difficulty, and the inertia effect and noises thereof are hard to be eliminated. Two inner rings of the curved groove ball bearing mechanism are fixedly connected, and a valve mechanism and an ignition mechanism are driven through a gear pair, so that the two sets of cylinders and pistons reciprocate in opposite directions to automatically balance reciprocating inertia thereof. Compared with the prior art, the present invention has simple motion forms which only consist of the rotary motion and the reciprocating motion, and low noises are produced.