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Патент USA US2133121

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Oct. 11, 1938.
Filed April 2, 1936
Richard I ?z‘earvzp'lf
Patented Oct. 11, 1938
Richard I. Stearns, II, Chicago, 111.
Application April 2, 1936, Serial’ No. 72,363
2 Claims. (CI. 88-29)
This invention relates to a new and improved
method of, obtaining stereoscopic vision from
stereoscopic pictures. The stereoscopic pictures
may comprise ?at objects formed by the partial
covering of one object by another. The per
ception of depth is believed to be due to the dif
position in a frame to form a stereoscopic screen.
One of the strips 2 is carefully adjusted to re
?ect light receivedv from the center of ‘the mir
ror ‘I to the position of the right eye 8,'the re
mainder of the mirror being covered so as notv
to re?ect light. Then each one of the narrow
ference between the retina images on the two . strips 2, which as shown, forms the front sec
tion of the ‘screen, is set to re?ect similarly from
The well known and simple method of making the same line on the mirror ‘I to the eye 8. The
a stereoscopic picture visible to several people ‘e?ect'of the combined re?ecting strips is that of
simultaneously is to provide offset left-eye and a concave mirror having for its focus the posi-.
right-eye pictures of different colors, one over tion of the eye 8. It will be apparent that in
the other, and giving each observer spectacles
order to obtain concave mirror results; the re
of different colors for each eye.
?ecting strips must be very narrow and the ad
Attempts to use prisms or diffraction gratings justment of each strip very exact. In a similar
have not proved practical for group stereoscopic manner the re?ecting strips 3 forming the rear
section of the stereoscopic screen are each ad
vMy invention comprises the use of an illumi
justed-to focus on the left eye 9.
nated screen placed between the observers and
When a red light or a red colored ?lm'is used
the stereoscopic picture by means of which the to illuminate the screen from the right side, the
observers’ will simultaneously receive three-di
right eye will see a red color; with blue illumi
mensional effects.
nation on the screen from the left side the left
An illustrative embodiment of my invention. eye sees a blue color, the amount of color im
is shown in the accompanying drawing in which: parted to the screen in either case being just
The ?gure is a diagrammatic drawing showing enough to be equivalent to- looking through a
the position of the stereoscopic screen through spectacle of the same color as that of the respec
which the picture is seen and the path of the rays tive screen. If the re?ecting strips have been
of re?ected light that is mixed with light reach
set to obtain an offset of color focus substantially
ing the eyes from the picture.
equivalent to the distance between the eyes, 8
By my invention the use of different colored and 9, then practically the entire surfaces of the‘
glasses, one for each eye, is eliminated and the two ?xed mirrors ‘I and.- I 0 may be uncovered,
same or equivalent results are obtained by plac
and the division of color observed by covering
ing near the stereoscopic picture I a transparent ?rst one eye and then the other will be quite
screen made up of re?ecting surfaces 2, which marked over a wide range at the positions of
re?ect only light received from the right side, the eyes 8 and 9. When the eyes are moved to
and similar re?ecting surfaces 3 which re?ect the left the re?ecting angle to the right eye is
only light received from the left side. A colored reduced with‘ an equal change of the incident
source of light or lamp 4 is placed at the focus
angle, but the color remains the‘ same. In a
of a curved mirror 5, and the substantially paral
similar manner with respect to the left eye the
lel rays 6 are re?ected from a plane mirror ‘I
re?ected angle is increased and the angle of
to the re?ecting surfaces 2 shown in sectionin the incident ray is also increased. In operation,
the diagram. The re?ecting surfaces 2 are trans
after the stereoscopic screen is adjusted and illu
parent strips of Celluloid, glass or the like, and minated, the stereoscopic picture I, which may
are each carefully adjusted to‘ the plane or angle comprise overlapping left-eye and right-eye
whereby the re?ected rays of light will converge stereoscopic pictures in red and blue respectively,
on the right eye 8.
is ?ooded with white light and is viewed through
In a similar manner rays from a second source
the ‘stereoscopic screen, with the red and blue
-of light are caused to converge on the left eye
color values on the screen adjusted to separate
9 by the re?ection from the transparent strips the overlapping pictures. The effect is somewhat
3 which receive light from the plane mirror ill the same as though a red glass or screen were
by way of the curved mirror H from the second placed in front of one eye and a blue glass or
source of light l2, placed at the focus of the
screen were placed in front of the other eye.
curved mirror H.
The amount of color required on the stereoscopic
In the assembly of my apparatus the narrow
screen to obtain resultsequal to the use of red
transparent strips 2 are individually placed in and blue spectacles is surprisingly small.
eyes, as in the use of binocular instruments.
‘ 2
,2,1ss,121- ,
Experience has'proved that the‘ relative in
recting blue light-solely to the left eye of the '
' .tensity of the colored lights as compared with. observer to dominate the blue image rays of the
. the stereoscopic picture illumination, to obtain blue picture for that eye and not the red image
the best stereoscopic results,‘ is easily controlled.
raysoi' the red picture. ' a
2. The method of obtaining stereoscopic effects
1 Although but one set of re?ected rays is shown
in the diagram it wilt beapparent that‘ adjacent . ‘which ‘consists in ?ooding overlapping left-eye
and right-eye stereoscopic pictures in- comple
mentary colors with-light and directing light
quite a wide range of'positions at which the ob- ~ from both pictures to the left and right eye pol,
' rays will be offset as to spacing to the observer
andthat the visible stereoscopic resultscover'
server may bei'located.
-'sitions for the eyes of an' observer, directing 10
light of the. color of the left-eye picture solely
to the right eye of the observer of the picture to
fects which consists in ?ooding overlapping red . 'dominate the image rays coming to that eye
left-eye and blue right-eye stereoscopic pictures g from the left-eye picture and not the image rays
with white light- and'directing light from both‘ of the right-eye picture, and simultaneously di 15
pictures to bothathe left and right eye positions recting light 01 the color of the right-eye pic
for the eyes of an observer, directing- red light ture solely to the ‘left eye of the observer to v
solely‘ to the right eye of the observer of .the‘ dominate the image rays coming to the left eye
'picture to dominate the red‘ image rays of the from the right-eye pictureiand not the image
I claim:
1. The method of obtaining stereoscopic ef
red picture for that eye and not the blue image
rays of theblue picture, and simultaneously di
rays of the left-eye picture.
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