Patent ID: 6639729
Filing Date: 2003-10-28
Classification: G02B,H04N

Abstract:
A reflecting type of zoom optical system comprising:a plurality of optical elements selected from the group consisting of (a) optical elements each of which includes a transparent body and two refracting surfaces and a plurality of reflecting surfaces formed on the transparent body, and each of which is arranged so that a light beam enters the transparent body from one of the two refracting surfaces, repeatedly undergoes reflection by the plurality of reflecting surfaces, and exits from the other of the two refracting surfaces; and (b) optical elements on each of which a plurality of reflecting surfaces made from surface reflecting mirrors are integrally formed, and each of which is arranged so that an entering light beam repeatedly undergoes reflection by the plurality of reflecting surfaces and exits from the optical element, wherein an image of an object is formed via said plurality of optical elements and zooming is performed by causing at least two optical elements from among said plurality of optical elements to vary their relative positions.