Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – With rear-view reflectors
Patent
1990-06-08
1992-07-14
Bovernick, Rodney B.
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
With rear-view reflectors
351158, 359462, 359475, 359630, 358 88, G02C 714
Patent
active
051297167
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to an appliance serving for stereoscopic image display which can be worn on head and it has two video displays mounted in a common stiff frame and there is an optical system consisting of lenses and mirrors arranged symmetrically on the right and left sides of the head in such an order that it ensures simultaneous watching of both the surroundings and tv image practically without disturbing each other.
BACKGROUND ART
It is a general endeavour in case of most people to spend time of travelling and waiting in a more useful way, getting informed or entertaining. Its traditional means besides newspapers and books are the wide-spread walkman (cassette player with stereo earphones) and the radio walkman (earphones with radio receiver).
In spite of the fact that most popular amusement in the homes preceding reading and listening to radio is watching tv and video, however it has not spread in public vehicles, in streets, etc. Its most important reasons are: screen size of miniaturized tv is too small to enjoy the image: watching small picture for a long time strains the eyes; increasing the picture is limited because of claim of portability, ability to keep it in a pocket, on the other hand the limit that screen held in hands can be maximum in an arm's length. Consequently we increase size of picture in vain; over a certain limit picture seen from a too close distance shows line-structure; screen of tv set held in hands, because of sight, is watched by people standing around, which can be disturbing; at day-light or at strong inner lighting image fades or gets contrastless.
Such an appliance is suitable for solving the problem which: 1) light, 2) small sized, 3) picture appears in a good distance (i.e. 2-3 meters), 4) picture cannot be seen by others, 5) the appliance need not be held in hands, 6) while watching it, the person can see his surroundings free, 7) screen is strongly shaded from outer light, in this way it is perfectly contrasty.
The U.S. Pat. No. 4,310,849 is known (Jan. 12, 1982, Stuart M. Glass, "Stereoscopic video system") which is a stereo image and voice broadcasting unit fixed to the head, where tv pictures of right and left type is forwarded to the left and right eyes by fibreglass optics, voices forwarded to ears by stereo earphones. The appliance can be fixed to the head by head band system. Its disadvantages are: band system is heavy and big, wearing it is uncomfortable and striking, and the band in front of the eyes disturbs looking around, i.e. its wearer can see only tv screen and not the surroundings. Tv mounted into helmet is described in G. V. Mamchev's book "The Stereo Television" (Muszaki Konyvkiado, Budapest - Mir Publishing House, Moscow, 1981, page 58). A special cover is fixed to the forehead part of the viewer's helmet in which two cathode ray tubes are situated almost vertically with looking downwards above the left and right eyes, and viewer sees the two screens through a lense and a mirror. The helmet is heavy and big in this case too, and the cover including the mirrors disables the viewer to see the surroundings free.
The U.S. Pat. No. 4,559,555 has the same operation principle (Dec. 17, 1985, Arnold Schoolman, "Stereoscopic viewing system"), a tv set mounted in a helmet as as described by its FIG. 5-7, arrangement of elements and its disadvantages are similar.
The U.S. Pat. No. 4,706,117 (Nov. 10, 1987, Arnold Schoolman, "Stereo Laser disc viewing system") describes a tv set of various construction fixed to the head. According to its FIG. 6-8 there is a protruding extension is a big closed unit in front of the viewer's eyes, in which there are two built-in objectives, two screens with liquid crystal and two lamps for lighting the screen and the extension is fixed to the head by a head band system. According to appliance described in its FIG. 10 there are two lenses in front of the eyes and beyond them there are two LCD screens. In the cases of appliance mentioned in above patent description, the protruding extension makes possible
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Endrei Karoly
Endrei Karolyne
Holakovszky Laszlo
Kezi Laszlo
Bovernick Rodney B.
Ryan J. P.
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