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Патент USA US2047282

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July 14, 1936-
Filed Sept. 29, 1954 '.
Patented July 14,21936
Oran E. Miller, Rochester, N. Y., assignor to
Eastman Kodak Company, Rochester, N. Y., a
corporation of New York
Application September 29, 1934, Serial No. 746,250
‘2 Claims. (01. 88-24)
My present invention relates to an improved I for motion picture ?lm provided with transverse ,
apparatus for duplicating lenticular ?lm and more lenticulations.
particularly to the printing of such ?lm at a
be observed
magni?cation other than unity.
In the reproduction of lenticular color ?lms by
projection printing it is possible to print-either
at an increase in magni?cation or at a reduction
but heretofore such reproduction has always been
subject to the limitation that the resulting rela
10 tive aperture is increased or decreased inversely
as the magni?cation. This change of relative
aperture in‘ the print gives rise to a number of
that in making a reduction print on a ?lm I 0 from
an original ?lm l l with the lenticulations of both 5
?lms parallel to one another, if the print is to be
recorded at the same relative aperture as the rec- '
0rd on the original ?lm II), it will be necessary in
projecting the ?lm It) to employ a banded ?lter l2
which subtends an angle at the ?lm l0 which is
equal to the angle which is‘ subtended at the ?lm
l I by aL?Iter l3 which would be used in projecting
If the ?lter I2 is superposed on the
?lter l3, certain parts of the three ?lter areas 1',
g, b and R, G, B of the two diaphragms I2 and I3
respectively are common to both diaphragms. By
disadvantages for if it is decreased considerable ' the ?lm II.
light is lost in projecting the copy ?lm .and the
resolving power requirements are increased, while,
if the relative aperture is increased, the relative
aperture of the lenticulations or of the projection
system will probably be exceeded.
These disadvantages are not present when the
20 printing is carried out with the lenticulations on
the copy ?lm extending in a direction which is at
a considerable angle to the'direction of the ‘len
ticulations of the original ?lm and this arrange
ment for making a copy of an altered scale is
25 described and claimed by Merrill W. Seymour in
an application ?led August 1, 1930, Serial
#472,349, which issued October 9, 1934 as Patent
No. 1,976,300.
The primary object of the present invention is
.30 to provide an apparatus for printinggo?‘ered ?lm
on an altered scale and with the go?ierings on
the two ?lms extending parallel to one another
without materially affecting the relative aperture
at which the print is recorded.
Another object or my invention is to provide a
method and apparatus for printing lenticular ?lm
with a magni?cation other than unity whereby
the lenticulations on both the original and copy
?lms may have the same relative aperture and
40 may extend in the same directions on the two
Other objects and advantages of the invention
using these common areas a diaphragm can be de
veloped which will give the print the correct rela
tive aperture if the overlapping areas of different
color bands are made opaque so that light coming
from one ?lter area in the original may not pass 20
through the diaphragm opening corresponding to
a di?erent ?lter area in the print. In Figs. 1 and 2
the opaque material it shows the portions whic ="~
must be made impervious to light. With these .
overlapping portions of di?erent ?lter ' areas
opaque as shown in Fig. 1, it will ‘be observed that
each of the three di?erently colored light beams
usually red, green and blue directed onto the copy
?lm ill will have passed through its corresponding
color component image on the original ?lm l i.
If the copy ?lm i0 is panchromatic, it would be
possible to print it using the color ?lters arranged
as shown in Figs. 1 and 2, however, as is well
known, in practice the ?lters can be replaced by a 35
diaphragm provided with apertures corresponding
to the usual ?lter areas and such a diaphragm it
is shown in Fig. 3.
From ‘the above description it will be evident
that the amount of reduction or magni?cation 40
possible-by this method is limited by the require
ment that the blue and red ?lter portions in the
will be apparent from the following description ' ?lm it must have at least some areas in common
when read in connection with the accompanying
drawing and its scope will be pointed out in the
appened claims.
In the drawing Fig. l is a diagraatic View
illustrating the evolution of the special diaphragm
employed in the present invention. Fig. 2 is a
plan view of the ?lters shown in
1. Fig. 3
is an elevation of aspeelal diaphragm developed as
shown in Figs. 1 and 2.
fl is a diagrammatic
view in perspective showing‘ an optical prmter eme
playing the diaphragm shown in Fig. 3. ln
55 is a diatic showing of an optical printer
with the blue and red ?lter portions in the ?lter 62.
In Fig. 4: a complete optical system utilizing 45
the special diaphragm it is shown for making a
reduced print on a goffered ?lm l 77 from a go?’erecl
original ?lm it}. The original ?lm it is uni
formly illuminated on its image side by means of
a suitable source of light iii and in interposed 50
rli?iusing medium 2b which may be ground glass.
An objective 2!] indicated in outline having the
desired relative aperture for projecting an aerial
image in the form of bands of the photographic
images on the original
at the ?lter plane of 55
?lm 23. The same is true oi the apertures til
and 39 and the image received by the ?lm 23 will
the objective 2i as is well known. A second ob=
jective 22 as shown in outline, projects‘this aerial
image onto the copy ?lm M and has the same
relative aperture as the objective 2 l’j'but its‘ focal.
length is less in order to secure the desired re
duction in the size of the image formed on the
be an exact duplicate on a reduced scale of the
image carried by the original‘?lm 24 except that
theoretically the color component images will be
separated by dark lines which would tend to res
duce the intensity of the subsequent projection
film ll. The special diaphragm it is positioned
in. the common ?lter plane of the two objectives
2i and 22 and due to its special shape as described
10 above, it transmits to the objective 22 only the
but as has been pointed out above the actual
.light lost due to this cause is very small by reason
of the resolving power of the photographic emuh
light having the proper color values.
In using the arrangement just described the
. decreased size oi the apertures in the diaphragm
sion on the ?lm 2?».
it theoretically reduces the amount of available
light in projecting the copy ?lm ll, actually
Although the invention has been described as
applied to a reduction printer, it is equally ap
plicable to printing on an enlarged scale with no
other valteration‘than changing the light source
to illuminate the film 23 whichin this case would
considerable tolerance is available due to the be the original ‘dim and the copy ?lm in the win»:
limit of the resolving power of the photographic dow 28 would receive‘ the enlarged image.
emulsion on the ?lm ill and the theoretical loss
lit will be‘ understood that any of the well“
or’ light is not a practical disadvantage.
known expedients may be employed in connection
In making a print on a sensitive motion picture with the printer of my invention for altering or
?lm 23 from an original motion picture ?lm 213' improving the color saturation or_ forelimlnat=
in accordance with my invention, a projection ing any moire pattern which may appear on the
printer on the type diagrammatically shown in
Fig. 5 may be employed. In this printer the
25 original ?lmiél or other picture record repre
sented as having horizontal lenticular elements
is moved a frame at a time by any well known
pull-down mechanism lnot shown) from a supply
reel 25 through a gate structure 26 to a take-up
copy film.
While I have described certain specific ar~
rangements for illustrating myv‘invention, it is to
be understood that other apparatus may be em»
ployed for practicing my invention without de
parting from the spirit of my invention, the scope
of which is pointed out in the appended claims. ,
What I desire to secure by Letters Patent in
illuminated from a light source 29 through a‘ the United States is:
plate 30 of ground glass or other diffusing me
l. A projection printer for printing from an
30) reel 2i. -'l‘he gate ‘it has a window it which is
dium‘; The ?lm
to be printed which also has original ?lm of a de?nite width and having linear
transverse lenticular elements is moved in syn
lenticulations on its surface upon a separate ?lm
35 chronism withthe ?lm 241, from a supply reel fill, ' of a different width and having linear lenticulae
past a window ill ‘and to a take-up reel 33. The tions positioned, when in the printer, in parallel
. optical system of the printer comprises objectives relation to those on the original ?lm, said printer
34 and.35 which have the same relative aperture comprising two windows for supporting the ?lmsl
but di?erent focal lengths as described in con
in printing position, means for illuminating the
40 nection with Fig. 4. These objectives are posi~
original ?lm in one window, an optical sytem for
tioned on a common axis between the printing projecting an image of the, original film on the
windows 28 and 32 so as to-image the original
?lm 24 on the copy ?lm 23.‘ There is positioned
between the objectives 3t and 35 ~‘a diaphragm
having apertures 3'11‘, 38 and 39 which correspond
respectively to the di?erent color components
of the picture being printed as was described in
connection with Figs. 1, 2 and 3. The shape and
size of the apertures 31!, 3t and 39 are determined
50 as above described so that the diaphragm 36 will
relative aperturekand a diaphragm between the
objectives, the diaphragm having a series of aper- "
tures corresponding to the registering portions
of the color bands when the ?lters for projecting
the two ?lms are. superposed.
2. A projection printer for printing pictures on
are common to both diaphragms, that is the
a sensitive ?lm having linear lenticulations from
an original ?lm having linear lenticulations par
allel to those on the sensitive ?lm comprising
means for supporting the two ?lms in spaced 55.
be used with the objective 35 for projecting the
[comprising . two objectives ’ of
transmit light only through those» parts of the
objective 35 corresponding to the parts of the
three ?lter areas of the two diaphragms which
?lm in the other window comprising two objec
tives of different focal lengths and of" the same
with theii‘ lenticulations, parallel and fac
diaphragm which would normally be used with' relation
ing each other, an optical system for imaging
the objective 34 for projecting the image of the the picture on the sensitive ?lm with a magni?
mm 24 and the diaphragm which would normally cation other than unity, said optical system
?lm 23.
From the above description it will be evident
that all of the printing light passing through
the aperture 31 in the diaphragm 36 will have
passed through a single color component image
on the original ?lm 24 and will be directed to a
65 single color component image area on the copy
lengths and of the same» relative aperture and a.
‘diaphragm between the objectives and having a.
series of apertures corresponding to the register
ing portions of the color- bands when the ?lters.
for projecting the two ?lms Iare superposed. .
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