| 摘要 |
<p>PROBLEM TO BE SOLVED: To reduce a radiation loss and to sufficiently increase light quantity by enhancing the availability of a total luminous flux (2πradian on a plane) radiated from a light source and increasing a reflection surface for the light source. SOLUTION: Data 14 and 14A or 14B are irradiated by condensing luminous fluxes diverging from a light source optical system at a condensing lens 11, and the luminous flux transmitted through the data 14, 14A or 14B is made incident on a projecting lens 13 and is projected. In this case, the light source optical system is made as a reflection light source optical system having a structure where a main reflection mirror 1 constituted by using a rotary elliptic surface mirror or a rotary parabolic mirror is cut and opened in the vicinity of a focus on the side of the light source 2 and a subreflection mirror 4 is attached so as to be opposed to a cut opening 5.</p> |
