| 摘要 |
PURPOSE:To image a spot light source while utilizing the energy of a lamp most effectively by using at least two quadratic curved-surface reflecting mirrors, which are rotationally symmetric with respect to the straight line connecting a spot light source position and a spot-light-source imaging position, in combination, and thus obtaining the imaged spot light source. CONSTITUTION:At least two quadratic curved-surface reflecting mirrors which are rotationally symmetric with regard to the straight line connecting a spot light source position 5 and a spot-light-source imaging position 6 as an axis 7 of rotational symmetry are used in combination to form an image of a spot light source at a different position. Then, while the positions 5 and 6 are regarded as conjugate points, those quadratic curved-surface reflecting mirrors are a quadratic curved-surface reflecting mirror which is sectionally shaped in part of an ellipse having focuses at one conjugate point and a point off the axis 7 of rotational symmetry in a plane containing the axis of rotational symmetry, and a quadratic curved-surface reflecting mirror which is sectionally shaped in part of an ellipse having focuses at the other conjugate point and a point off the axis of rotational symmetry. |
