Optical: systems and elements – Polarization without modulation – Polarization variation over surface of the medium
Patent
1992-04-07
1995-01-17
Shafer, Ricky D.
Optical: systems and elements
Polarization without modulation
Polarization variation over surface of the medium
359494, 359495, G02B 530
Patent
active
053830539
ABSTRACT:
A focusable virtual image display system employing a focusable image source such as a cathode ray tube and imaging optics to provide a virtual image. The virtual image is viewable by a user and its effective range may be changed without changing the apparent field of view or resolution. By placing the focus point of the imaging optics at the design eye, the image source is moved backwards and forwards, thus effectively changing the range of the virtual image observed by the user without changing the apparent field of view or resolution. The present invention allows the user to adjust the focus position of the virtual image of the image source by moving it relative to the imaging optics, while maintaining the size and resolution of the image. If the user wants to move the image further away, when the image source is moved, the imaging optics moves the virtual image further away and magnifies the image such that the angular field of view stays the same. The user cannot distinguish between the sizes, although the focus will be more comfortable for a particular accommodation range. The relative cost of the virtual image display system is relatively less expensive than large screen monitors due to the nature and complexity of the smaller components. By including a focus adjustment mechanism, the focusable virtual image display monitor has an added feature that a conventional large screen monitor does not provide.
REFERENCES:
patent: 3508809 (1970-04-01), Wilder et al.
patent: 3549803 (1970-12-01), Becht et al.
patent: 4007979 (1977-02-01), Coblitz
patent: 4221464 (1980-09-01), Pedinoff et al.
patent: 4670744 (1987-06-01), Buzak
patent: 4901084 (1990-02-01), Huguenin et al.
patent: 4963003 (1990-10-01), Hiiro
patent: 4987410 (1991-01-01), Berman et al.
Freeman; "Head-Up Displays-Part 2", Optics Technology, Aug. 1969, pp. 175-182.
Au Anson
Chern Mao-Jin
Hegg Ronald G.
Alkov Leonard A.
Denson-Low W. K.
Hughes Aircraft Company
Shafer Ricky D.
LandOfFree
Virtual image display having a high efficiency grid beamsplitter does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Virtual image display having a high efficiency grid beamsplitter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Virtual image display having a high efficiency grid beamsplitter will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-750957