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AssigneeRicoh Company, Ltd.
InventorsSatoshi Yamauchi, Kazuhiro Fujita, Tadashi Honda, Osamu Nagase
Estimating the term…
An illumination apparatus includes a reflector including a parabolic or ellipsoidal mirror, a light source arranged near a (first) focal point of the reflector, and a front mirror having a transparent window and a mirror surface symmetrical about the light axis. Luminous flux emitted from the light source is reflected from the reflector. In the case of the parabolic mirror, the front mirror has the same size as an entrance of an output light utilizing optical system, and the luminous flux exits toward the optical system as collimated light. In the case of the ellipsoidal mirror, the front mirror is arranged between two focal points of the ellipsoidal mirror, and the luminous flux is directed toward the second focal point. However, at least one part of the luminous flux is reflected from the front mirror and returned toward the first focal point.
An illumination apparatus comprising a light source, a reflector of which at least one portion is a first parabolic mirror, an output light utilizing an optical system that comprises an integrator optical system at an entrance thereof, and a front mirror with a fly-eye lens or a member corresponding thereto of the integrator optical system as one unit.
An illumination apparatus comprising a reflector, a light source, a front mirror provided between an exit of the reflector and the light source, and an output light utilizing an optical system comprising an integrator optical system,
An illumination apparatus comprising:
An illumination apparatus comprising:
Dependencies are inferred from the claim text.