ILLUMINATION OPTICAL SYSTEM AND PROJECTOR

摘要

Provided is an illumination optical system that can approximate the radiation angle characteristics of synthesized fluorescent light and laser light to each other. Illumination optical system includes laser light source, fluorescent light source, synthetic optical system configured to synthesize laser light emitted from the laser light source and fluorescent light emitted from the fluorescent light source, first lens, second lens, and third lens. The first lens is provided between the laser light source and the synthetic optical system. The second lens is provided immediately in front of the synthetic optical system on the optical path of the laser light that passed through the first lens. The third lens is provided immediately in front of the synthetic optical system on the optical path of the fluorescent light emitted from the fluorescent light source. The sum of the focal distance of the first lens and the focal distance of the second lens is set so that the maximum value of an angle formed between the laser light that passed through the second lens and the optical axis of the second lens can substantially match the maximum value of an angle formed between the fluorescent light that passed through the third lens and the optical axis of the third lens.

主权项

1.
An illumination optical system comprising: a laser light source for emitting laser light; a fluorescent light source for emitting fluorescent light; a synthetic optical system for synthesizing the laser light emitted from the laser light source and the fluorescent light emitted from the fluorescent light source; a first lens provided on a light path between the laser light source and the synthetic optical system; a second lens provided immediately in front of the synthetic optical system on an optical path of the laser light that passed through the first lens; and a third lens provided immediately in front of the synthetic optical system on an optical path of the fluorescent light emitted from the fluorescent light source,
wherein a sum of a focal distance of the first lens and a focal distance of the second lens is set so that a maximum value of an angle between the laser light that passed through the second lens and an optical axis of the second lens can substantially match a maximum value of an angle between the fluorescent light that passed through the third lens and an optical axis of the third lens.