Importance

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Abstract

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.

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First Claim