Title:
EYEPIECE OPTICAL SYSTEM AND EYEPIECE VIDEO DISPLAY DEVICE
Document Type and Number:
Japanese Patent JP3387338
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To present a large observation viewing angle being ≥100° by a single lens, to make the degree of the freedom of a pupil position large and to obtain an observation picture which is uniform and clear extending over a periphery by constituting an eyepiece optical system of a 1st to a 4th specified lens groups.
SOLUTION: The eyepiece optical system 2 is constituted so that the 1st to the 4th lens groups G1-G4 are arranged in turn from an entrance pupil 1 side. The 1st positive lens group G1 is constituted of a lens obtained by joining a meniscus lens L1 whose concave surface is turned to an eyeball side and a positive meniscus lens L2. The 2nd lens group G2 is constituted of a lens L3 whose both surfaces are aspherical and whose axial refracting power is negative. The 3rd lens group G3 is constituted of a lens L4 whose both surfaces are aspherical and whose axial refracting power is positive. The 4th positive lens group G4 is constituted of a lens obtained by joining a positive biconvex lens L5 and a negative biconcave lens L6. Then, a flat picture on a two-dimensional display element is enlarged and projected on the eyeball as a virtual image. Besides, it is preferable that the peripheral parts of both surfaces of the lenses L3 and L4 are curved so that the concave surfaces are turned to the eyeball side.
Inventors:
Shinsuke Shikama
Application Number:
JP34350096A
Publication Date:
March 17, 2003
Filing Date:
December 24, 1996
Export Citation:
Assignee:
Mitsubishi Electric Corporation
International Classes:
G02B25/00; G02B27/01; G02B27/02; G02B27/00; (IPC1-7): G02B25/00; G02B27/02
Domestic Patent References:
| JP784195A | ||||
| JP7318816A | ||||
| JP85938A |
Attorney, Agent or Firm:
Kaneo Miyata (1 person outside)