Observation optical system, and image displaying apparatus having the same
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United States of America Patent
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Jun 12, 2018
Issued Date -
Dec 15, 2016
app pub date -
May 16, 2016
filing date -
Jun 10, 2015
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Abstract
In order to obtain an observation optical system which has high optical performance while having a wide field of view, and can easily reduce variation of aberration at the time when an eye relief has changed, the present invention provides an observation optical system which is used for an observer to observe an image displayed on an image display surface, and includes in order from an observation side to an image displaying surface side: a first lens having a positive refractive power; a second lens having a negative refractive power; and a third lens having a positive refractive power, wherein a focal length f1 of the first lens, a focal length f2 of the second lens and a focal length f3 of the third lens are each appropriately set so as to satisfy the conditional expression of:
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