Observation optics and image display devices
The observation optical system in HMDs uses curved transmissive and reflective surfaces with controlled focal lengths and polarization elements to minimize light loss and aberrations, enhancing optical efficiency and field of view.
JP7885669B2Active Publication Date: 2026-07-07KONICA MINOLTA INC
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- KONICA MINOLTA INC
- Filing Date
- 2022-12-15
- Publication Date
- 2026-07-07
Smart Images
Figure 0007885669000021 
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Abstract
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
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