W. H. KUNZ.
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COLUR PHOTOGRAPHY.
APPLICATION man ^uG.2x. |914.
1 ,320,625.
Patented Nov. 4, 1919.
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William BJI/anzi.
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W.'H. KUNZ.
COLOR PHOTOGRAPHY.
1,320,625.
APPLICATION men Aus.2|. 19H.
Patented Nov. 4, 1919.
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UNITED STATES PATENT OFFICE.
WILLIAM H. KUNZ, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO KUNZ-G-ARNISS
COMPANY, A CORPORATION OF MASSACHUSETTS.
COLOR PHOTOGRAPHY.
1,320,625.
Specification of Letters Patent.
Application ñled August 21, 1914.
To all whom ¿t may concern.'
Patented Nov. 4, 1919.
Serial No. 857,961.
mirrors substituted for certain of the pris
Be it known that I, ÑVILLIAM H. KUNZ, a matic reflectors. Fig. 6 is a plan view of a
citizen of the United States, and a. resident three color device further modified. Fig. 7
of Boston, in the county of Suffolk and is a perspective View 0f an oblique quadri
Commonwealth of Massachusetts, have in
vented certain new and useful Improve
lateral prism provided with partial reflect
ing surfaces. Fig. 8 is a plan view of a con
ments in Color Photography, of which the struction wherein but two of the triplicate
'following is a full, clear, and exact descrip images are on the same plate. Fig. 9 is a
tion.
plan view of a construction having no two
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While multi-color photography, wherein of the triplicate pictures taken on the same
mirrors are employed, gives quite good re plane. Fig. 10 is a perspective view of still
sults for many lines of work, yet for motion another construction in which no two of the
pictures which must be magnified manyfold pictures are taken on the same plate. Fig.
in being cast upon a screen, the double re
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flection from their surfaces and the 'distor
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11 is a perspective view of a construction
wherein all three pictures are taken on the
tion of image caused by the mirrors -become same plate. Fig. 12 is a plan view of a con 70
very objectionable.
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struction where the dry plate is located
To avoid such troubles I have devised above the prisms. Fig. 13 is a perspective
means whereby prismatic reflectors may be view of the same.
employed, and in a manner to provide a
In the construction illustrated in Figs. l
light path for all the pictures, traversing and 2, there are five right-angled forty-five
equal amounts of glass of like refractive degree prisms, one cubical block, and one
index.
oblique prism, all of the saine kind of glass
While I have disclosed in my companion and cemented together in the manner shown,
application Serial No. 852,720 a construc and having two of the cemented surfaces
tion which accomplishes substantially the made partially reflecting. The right-angled
same results as do the several ‘forms herein prism l has its oblique surface 2 made par
set forth, yet in present disclosure appears tially reflecting by means of metal, as silver,
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to be equally e cient and in some respects platinum or the like, applied either in a
more practical for motion picture work.
very thin coating, or in stripes 3, as illus
The essential feature of the several forms trated in Fig. 7.
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of the present invention comprises a prism
The oblique prism 4 has its surface 5
having substantially parallel opposite faces made partially reflecting, either by a thin
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obliquely disposed relative to adjacent faces, coating or stripes 3, as already described,
one or more of the oblique surfaces being but in case stripes are applied the same
made wholly or partially reflecting.
must be offset with respect to those on the
Referring to the drawings 'forming part surface of said prism l, and they must also
of this specification, Figure l is a perspec be narrower by approximately one-half in
tive view of an arrangement of prisms order that the light rays which pass between
wherein triplicate pictures would all be the stripes on the surface 2 may partially
taken upon the same sensitive plate parallel pass between the stripes von the prism 4 and
with the top face of the grouped prisms. may partially be reflected. Moreover, the
Fig. 2 is a plan view of the‘same. Fig. 3 stripes 3 on the-surface 2 should be sub
is a sectional view of the same through the stantially one-third the width of the spaces
45 lens. Fig. 4 is a perspective view_ of a between them, so that approximately one
slightly modified construction wherein all third of the light shall be diverted and two
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of the triplicate vpictures will appear upon thirds may be permitted to pass through to
the sensitive plate right side up. Fig. ¿la the surface 5.
is plan view of a construction similarÀt-o that
While theoretically one-third o'f the rays
shown in Fig. 4, but differing therefrom in coming from the lens 6 should thus be ap
its location of the lens, and also in illustrat portioned to each of the three sensitive
. ing the prisms adapted for four-color work. plates upon which the triplicate photo
Fig. 5 is a perspective View of a construc graphs are taken, such proportion must be
tion similar to that in Fig. 4 but showing materially changed to accord with the
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actinic value of the different color filters, right angled prisms 21, 22, one of which
and the color sensitiveness of the plates has its oblique surface made partially re
used.
flecting to divert a part of the rays which
To the striped surface 5 of the prism 4 would otherwise pass to the prism 13, to a
is cemented a triangular prism 9, and to the laterally positioned reflecting prism 23 by
latter a forty-five degree prism 10 posi _which said diverted rays are directed up
tioned with its oblique surface 11 under ward to a fourth section of the sensitive
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neath, and also rendered fully reflective by plate.
being suitably metallized, in order that the
Fig. 5 differs in its showing from the
light rays from the lens 6 which reach said structure illustrated in Fig. 4 by the sub
surface are reflected vertically upward, as stitution of mirrors for certain of the pris
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indicated in Fig. 3. A prism 12, which is matic reflectors; the mirror 24 taking the
like the prism 10 and similarly metallized, place of the oblique prism 17 and its sil
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is cemented to the end of the oblique prism vered surface; and the mirrors 25, 26 and
4 for diverting upward the light rays re 27 taking the place of the reflector prisms
flected from the oblique surface 5; and a 10', 12 and 13. Here air-spaces take the
like prism 13 is provided for reflecting up place of the glass cubes 19, 20.
ward the rays reflected from the stripes on , In the constructions shown in Figs. 8, 9
the surface 2. To furnish a focal length and 10, less glass is required than in some
equal to that of the other two photographs, of the above described devices, but the sen
and also to provide equal amounts of glass sitive plates must be located in two or more
'for the paths of the light-rays, a glass cube different planes. Fig. 8 illustrates an ar
14 is cemented between the prisms 1 and 13. rangement wherein both oblique surfaces of
In this manner three like photographs the prism 4 are partially reflecting, so that
can be taken upon the same sensitive plate
7. To adapt the same for color work, color
filters are introduced into the paths of the
rays, either between the reflector prisms
10, 12 and 13 and the remainder of the
glass, as shown in Fig. 2 at 15, or above
said prisms, as shown at 16 in Fig. 3.
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a part of the rays pass straight on through 90
a triangular prism 9 to a sensitive plate 29;
while the rays which are diverted by said
partially reflecting surfaces, go to a sensi
tive plate 30. Color filters 31 cemented or
otherwise secured to the surfaces from
which the light-rays emerge, adapt this
The only objection to above described camera for three color work.
construction is that the picture taken
In Fig. 9, four right angled prisms are
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through the prism 10 will be reversed as shown as grouped to present a partially re
compared with the pictures taken through flecting surface 32 for diverting a portion
the prisms 12 and 13. To correct this, a
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of the rays to a sensitive plate 33 at the op
second oblique prism 17 is cemented to the posite side of the prisms from the plate 30,
first oblique prism 4 in the place of the but otherwise it 1s similar to the device
triangular prism 9, as is shown in Fig. 4, shown in Fig. 8.
and then the prism 10’ is applied to the
Instead of having all the plates perpendic
end of the oblique prism 17 to present its ular to one plane, as shown in Figs. 8 and
silvered surface 11’ parallel with the sil 9, one or more partially reflecting surfaces
vered surfaces of the prisms 12 and 13. 34, 34’ may be disposed for diverting por
The outer oblique surface of the prism 17 tions of the light-rays in directions perpen
is metallized to render it wholly reflecting, dicular to the plane traversed by the rays
so that the rays which in the other construc emerging from the other two surfaces of the
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tion went to the prism 10 in a straight line device, as indicated' in the construction
from the lens, are now turned at right illustrated in Fig. 10.
angles and are then reflected upward to the
Figs. 11, 12 and 13 illustrate constructions
50 sensitive plate by the said surface 11’.
wherein triplicate photographs are taken on 115
Inasmuch as this lengthens the focal a common sensitive plate, the centers of po
length of the rays through the prism 10', sition of which photographs are in the three
both in space and in glass, glass cubes 19 small circles 35 in Fig. 12. In this case, the
and 20 are introduced in the paths of the rays which are deflected by the partially re
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flecting surface 2, are partially deflected by 120
tively.
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Fig. 4a illustrates a modified form of the
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oblique prism 37, and then wholly diverted
construction set forth in Fig. 4, wherein the by the reflecting surface 39.
lens 6 is changed to a point where the rays
In the construction shown in Fig. 11, the
through it are delivered into the end of the rays from the reflecting surface 39 pass
oblique prism 4, thereby rendering itv neces straight on through a cube 40, and the rays
sary to metallize both of the latter’s oblique reflected from the wholly reflecting surface
surfaces, but making it more practical to 41 of the oblique prism 42, pass directly
convert the device into a four-color camera.
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the partially reflecting surface 36 of the
through the two glass cubes 43, 44 to a com
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This is done by the addition of the two mon sensitive plate not illustrated. To give 130
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a path through space and lass for the rays images may be produced on a sensitive sur
not diverted by the partiafly reflecting sur
face 36, which shall equal those of the other
two sets of rays, a triangular prism 45 is
cemented to the surface 36 of the prism 37,
and an oblique prism 46 is cemented to the
vertical surface of said prism 45. Both
oblique surfaces of said prism 46 are made
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face, I saw a small slot 60 into certain cor
ners of certain prisms, and fill them with
opaque material. These are shown in Figs.
2, 4a, 9 and 12.
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What I claim is:
1. Apparatus for multi-color photog
raphy comprising a lens, a glass prism in
wholly reflecting, and thereby cause the the form of an oblique parallelepiped, a tri
rays to be diverted first upward and then angular prism having its hypotenuse ce
horizontally to the sensitive plate. In this mented to an oblique surface of the first
case, the sensitive surface is supposed to be named prism, both oblique surfaces being
parallel with the surfaces from which the reflecting, the one cemented to the triangu
small arrows are illustrated as emerging.
lar prism being but partially so, a glass
In the structure shown in Figs. 12 and 13, block cemented to said triangular prism
a cube 50 is cemented to the triangular on the face farthest from the lens, and
prism 45, and an upwardly reflecting prism means for supporting sensitive surfaces for
51 is cemented to said cube; the cubes 40, the direct and reflected ra 's.
4-4 of the structure shown in Fig. 11 being
2. Apparatus for mufti-color photog
replaced by upwardly reflecting prisms 52, raphy comprising a lens, a glass prism in the
53. rI`he light rays may come either from form of an oblique parallelepiped, two trian
the direction of the arrow shown in Fig. 13, gular prisms each having its hypotenuse ce
or from the lens 6 shown in Fig. 12, but in mented to an oblique surface of the first
cach case the sensitive surface is parallel named prism, both oblique surfaces being
with the top of the prismatic arrangement, partially reflecting, a glass block cemented
land color filters are provided for the emerg to the triangular prism nearest said lens and
ing light rays in any of the above described to the surface of the same farthest from the
ways.
lens, and means for supporting sensitive
The construction illustrated in Fig. 6 dif surfaces at the foci of the direct and reflect
fers from that shown in Fig. 4a in the re ed rays.
moval of the prisms 17 and 10', and of the
In testimony that I claim the foregoing
cubes 19 and 14, thereby converting the same invention, I have hereunto set my hand this
into a three color camera.
19th day of August, 1914.
To insure that no rays shall be refracted
from the lens 6 to points at the extremities
of the partially reflecting surfaces and
thence to undesigned points whereby double
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WILLIAM H. KUNZ.
Witnesses :‘
A. B. UPHAM,
EDWIN SHIVELL.
Copies of this patent may be obtained for ñve cents each, by addressing the “Commiuioner of Patent
Washington, D. 0.”
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