Patent ID: 9575403
Date: 2017-02-21
CPC Classifications: G02B,G03B

Claim:
1. An illumination optical system comprising: a first lens that condenses a first luminous flux that is emitted from a first optical fiber with a first angle of divergence; a second lens that condenses second luminous flux that has a color that is different from a color of said first luminous flux and that is emitted from a second optical fiber with a second angle of divergence that differs from said first angle of divergence; and a synthesizing optical element that is provided at a position at which an optical axis of said first lens intersects with an optical axis of said second lens at a right angle, that transmits said first luminous flux from said first lens and that reflects said second luminous flux from said second lens in a direction in which said first luminous flux was transmitted; wherein said first and second lenses are configured such that a convergent angle of said first luminous flux that was condensed by said first lens coincides with a convergent angle of said second luminous flux that was condensed by said second lens, wherein said first lens is configured such that the following relation is satisfied: and said second lens is configured such that the following relation is satisfied: where β1 and β2 are the magnifications of said first and second lenses, respectively, θ1 and θ2 are said first and second angles of divergence, respectively, and the convergent angle of said first luminous flux that has been condensed by said first lens and the convergent angle of said second luminous flux that has been condensed by said second lens are both θ3.