| 摘要 |
PURPOSE:To observe information clearly by interposing a translucent mirror between the transmission system and reflection system of an optical system and superimposing exterior information and information from an image display part upon each other. CONSTITUTION:The image display part R and the optical system L of the transmission system are provided, and information is imageformed on a curved surface F shown by a chian line. Further, the ceiling part of a steering room is provided with a spherical reflecting mirror in specific relation with the transmission system and the translucent mirror MH is provided so that the exit pupil P of the reflecting mirror M1 is symmetrical with the exit pupil of the transmission system L. Consequently, information is projected on the image display part R at infinite distance, and when the exit pupil P is positioned on a surface containing the center C of curvature of the spherical mirror M, parallel luminous flux passing through the exit pupil P is free of coma and astigmatism at any angle of visual field and the image is formed on the focal plane F' of a spherical surface whose radius of curvature is a half as large as that of the spherical mirror M. |
