CPC G02B 27/0172 (2013.01) [G02B 9/14 (2013.01); G02B 17/0816 (2013.01); G02B 17/0852 (2013.01); G02B 17/0856 (2013.01); G02B 2027/011 (2013.01); G02B 2027/0116 (2013.01)] | 8 Claims |
1. An optical system configured to guide a light beam from a display element, the optical system comprising:
a positive lens;
a negative lens; and
an optical element having a transmission surface, an optical surface, and a reflection and transmission surface,
wherein the light beam from the display element;
passes through the positive lens, the negative lens, and then the transmission surface;
then reflects on the reflection and transmission surface and then on the optical surface;
then passes through the reflection and transmission surface; and
then travels to an exit pupil, and
wherein the following inequalities are satisfied:
0.28<nn-np<0.60
50.26≤vp-vn<80
where np and nn are refractive indices of the positive lens and the negative lens for the d-line, respectively, and vp and vn are Abbe numbers of the positive lens and the negative lens for the d-line, respectively.
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