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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 in which at least one part of a reflector is a first parabolic mirror, a light source is arranged near a focal point of the first parabolic mirror, and collimated light that is emitted from the light source and reflected from the first parabolic mirror exits toward an output light utilizing optical system, wherein a front mirror is arranged on a light path of the collimated light, said front mirror comprising:
An illumination apparatus in which at least one part of a reflector is a first parabolic mirror, a light source is arranged near a focal point of the first parabolic mirror, and collimated light emitted from the light source and reflected from the first parabolic mirror exits toward an output light utilizing optical system, the reflector comprising:
An illumination apparatus using an ellipsoidal mirror in at least one part of a reflector, arranging a light source near a first focal point of the ellipsoidal mirror and reflecting luminous flux emitted from the light source by the ellipsoidal mirror to direct the luminous flux to near a second focal point of the ellipsoidal mirror, wherein a front mirror, on which a window having no mirror surface is formed near a light axis extending through the first focal point and the second focal point, is arranged between the first focal point and the second focal point, and at least one part of the light reflected from the ellipsoidal mirror among the luminous flux emitted from the light source is reflected from the front mirror in front of the second focal point to be returned to the ellipsoidal mirror or a vicinity of the first focal point.
Dependencies are inferred from the claim text.