21-01-2021 дата публикации
Номер: US20210018750A1
Принадлежит:
A head-up display includes a display device and a projection optical system; the projection optical system includes first and second optical elements arranged in order of an optical path from the image; and when optical paths corresponding to an upper end and a lower end of the virtual image are defined as an upper ray and a lower ray, respectively, and a diverging effect and a converging effect are defined as being negative and positive, respectively, the first and the second optical elements satisfy conditional expressions P_u−P_l<0 and P_u−P_l>0 (where P_u denotes a local power of the first optical element acting on the upper ray, P_l denotes a local power of the first optical element acting on the lower ray, P_u denotes a local power of the second optical element acting on the upper ray, P_l denotes a local power of the second optical element acting on the lower ray). 1. A head-up display displaying an image as a virtual image to an observer ,the head-up display comprising:a display device displaying the image; anda projection optical system magnifying and projecting the image, whereinthe projection optical system includesa first optical element and a second optical element arranged in order of an optical path from the image, and whereinwhen optical paths corresponding to an upper end and a lower end of the virtual image are defined as an upper ray and a lower ray, respectively, anda diverging effect and a converging effect of the first optical element and the second optical element are defined as being negative and positive, respectively, {'br': None, 'i': P', 'u', 'P', 'l, '_1−_1<0\u2003\u2003(1)'}, 'the first optical element and the second optical element satisfy the following conditional expressions (1), (2)where{'b': '1', 'P_u denotes a local power of the first optical element acting on the upper ray, and'}{'b': '1', 'claim-text': {'br': None, 'i': P', 'u', 'P', 'l, '_2−_2>0\u2003\u2003(2)'}, 'P_l denotes a local power of the first optical element acting on ...
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