OBSERVATION OPTICAL SYSTEM AND IMAGE DISPLAY DEVICE

• Main Authors: ARITA HIROAKI, TOTSUKA HIDEKAZU
• Format: Patent
• Language: English; Japanese
• Published: 27.06.2024
• Subjects: OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PHYSICS

To suitably prevent light quantity loss.SOLUTION: An observation optical system 10 guides light from a display panel 50 for displaying an image to an observer. The observation optical system includes optical surfaces of a first surface R1, a second surface R2, a third surface R3, and a fourth surface R4, in order from an observation side toward an image display side. The first surface R1 and the fourth surface R4 are a transmission/reflection surface that transmits and reflects light and formed into a curved surface. The following conditional expression is satisfied. (1) 0.3≤|f2/f1|≤1.3. In the expression, f1 is the focal length of a first lens L1 having the first surface R1 and the second surface R2, and f2 is the focal length of a second lens L2 having the third surface R3 and the fourth surface R4.SELECTED DRAWING: Figure 1 【課題】光量ロスを好適に抑制する。【解決手段】観察光学系１０は、画像を表示する表示パネル５０からの光を観察者に導く。観察側から画像表示側に向かって順に、第１面Ｒ１、第２面Ｒ２、第３面Ｒ３、第４面Ｒ４の光学面を含み、第１面Ｒ１及び第４面Ｒ４の各々は、光の透過と反射を行う透過反射面であり、かつ曲面状に形成され、以下の条件式を満足する。０．３≦｜ｆ２／ｆ１｜≦１．３ ・・・（１）ただし、ｆ１は、第１面Ｒ１及び第２面Ｒ２を有する第１レンズＬ１の焦点距離であり、ｆ２は、第３面Ｒ３及び第４面Ｒ４を有する第２レンズＬ２の焦点距離である。【選択図】図１