Patent ID: 8820942

Claim:
A light dividing structure for use in an optical machine system of a projection apparatus, comprising: a first prism, having: a first exiting surface and a first reflecting surface that include a first angle therebetween; a first concave portion being disposed on the first exiting surface and away from the first angle; a second concave portion being disposed on the first reflecting surface and away from the first angle; a second prism being disposed on the second concave portion of the first prism and adjacent to the first prism; a third prism being adjacent to the second prism and disposed opposite the first prism, having: a second exiting surface and a second reflecting surface that include a second angle therebetween; a third concave portion being disposed on the second exiting surface and away from the second angle; a fourth concave portion being disposed on the second reflecting surface and away from the second angle; and a fourth prism being disposed on the fourth concave portion of the third prism and adjacent to both the third prism and the first prism; wherein the first prism is adjacent to the fourth prism by the first reflecting surface and the third prism is adjacent to the second prism by the second reflecting surface so that the first prism, the second prism, the third prism and the fourth prism are connected sequentially.