PROJECTION OPTICAL SYSTEM AND PROJECTION TYPE DISPLAY DEVICE

• Main Author: AMANO MASARU
• Format: Patent
• Language: English; Japanese
• Published: 07.03.2019
• Subjects: ACCESSORIES THEREFOR; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USINGWAVES OTHER THAN OPTICAL WAVES; APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FORPROJECTING OR VIEWING THEM; CINEMATOGRAPHY; ELECTROGRAPHY; HOLOGRAPHY; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PHOTOGRAPHY; PHYSICS

To provide a projection optical system and a projection type display device having improved performance capable of reducing influence to imaging performance by adhesion or the like of foreign matters in an optical system that comprises a combination of a reflection optical system and a refraction optical system and forms an intermediate image.SOLUTION: A projection optical system forms an intermediate image MI in a position being a conjugate with a reduction side image-forming surface, and forms a final image being a conjugate with the intermediate image MI on an enlargement side image-forming surface. The projection optical system includes: a convex surface mirror M disposed in an enlargement side of the intermediate image MI; and at least one lens that is disposed in an optical path in an enlargement side of the convex surface mirror M and has positive or negative refractive force.SELECTED DRAWING: Figure 1 【課題】反射光学系と屈折光学系との組合せからなり中間像を形成する光学系において、異物の付着等による結像性能への影響を低減可能で良好な性能を有する投写用光学系、及び投写型表示装置を提供する。【解決手段】投写用光学系は、縮小側結像面と共役な位置に中間像ＭＩを形成し、中間像ＭＩと共役な最終像を拡大側結像面に結像させる。投写用光学系は、中間像ＭＩより拡大側に配置された凸面ミラーＭと、凸面ミラーＭより拡大側の光路に配置された正または負の屈折力を有する少なくとも１枚のレンズとを備える。【選択図】図１