Importance

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Abstract

In a method for designing a mirror, a design formula of a reflecting surface is used which is derived based on conditions that: an intersection point between a sagittal light source ray and an incoming light ray to an M^A point and an intersection point between a meridional light source ray and the incoming light ray to the M^A point are represented by using L_1s^A and L_1m^A, respectively; an intersection point between an outgoing light ray from the M^A point and a sagittal virtual collected light ray and an intersection point between the outgoing light ray from the M^A point and a meridional virtual collected light ray are expressed by using L_2s^A and L_2m^A; an intersection point between a sagittal virtual light source ray and an incoming light ray to an M^B point and an intersection point between a meridional virtual light source ray and the incoming light ray to the M^B point are expressed by using L_2s^A and L_2m^A, and L; and an intersection point between an outgoing light ray from the M^B point and the sagittal collected light ray and an intersection point between the outgoing light ray from the M^B point and the meridional collected light ray are expressed by using L_2s^B and L_2m^B; and both optical path lengths from a light source position to a virtual light collection position and from a virtual light source position to a light collection position are constant.

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First Claim