OPTICAL SYSTEM AND DISPLAY DEVICE

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OPTICAL SYSTEM AND DISPLAY DEVICE

This abstract first appeared for US patent application 18834917 titled 'OPTICAL SYSTEM AND DISPLAY DEVICE

Original Abstract Submitted

To facilitate the correction of aberrations of lenses in an optical system. The optical system is used to observe an image displayed on an image display surface of a display element from an observation unit. The optical system includes a first lens group and a second lens group. The first lens group is provided with a transparent element having a first transflective surface, a first aspherical lens, and a second aspherical lens having a second transflective surface, which are arranged sequentially in order from the observation unit. The second transflective surface is formed on the side of the second aspherical lens with a positive refractive power facing the image display surface. The second lens group is arranged between the first lens group and the image display surface and is provided with at least one aspherical lens. The first aspherical lens has a higher absolute focal length than the second aspherical lens, and the first aspherical lens has a smaller Abbe number at a d-line than the second aspherical lens.