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Патент USA US2129205

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Sept. 69 @938,
J. EGGERT ET AL
29129205
MANUFACTURE OF LENTICULAR PRINTS
Filed Jan. 3, .1935
Wm
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By
2 Sheets-Sheet l
Sept. 6, 1938.
J. EGGERT ET'AL
‘2,129,205
MANUFACTURE OF LENTICULAR PRINTS
Filed Jan. 5, 1935
By
2 Sheets-Sheet 2
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In venfors :
Afforneys
v ‘”'/ ‘
'
- Patented Sept. 6, 1938
“
2,129,205
UNITED STATES PATENT OFFICE
2,129,205
.
MANUFACTURE OF LEN'I'ICULAR PRINTS
John Eggert, Leipzig-Gohlis, and Gerd Heymer,
Woll’en .Kreis Bltteri'eld, Germany, assignors
to I. G. Farbenindustrie Aktiengesellschaft,
Frankfort-on-the-Main, Germany
Application January 3, 1935, Serial No. 272
In Germany January 9, 1934
4 Claims. (CI. 88-24)
5
Our present invention relates to the manufac-
tion of the lenticular elements through any point
ture of lenticular prints and more particularly to
the manufacture of lenticular prints wherein projection printing is used.
of the diaphragm cuts only one aperture corre
sponding with a ?lter strip of the taking ?lter,
or an illuminating device as described in the co
One of its objects is to provide an improved pending application Ser. No. 634,070, ?led Sept.
process of manufacturing lenticular prints. Fur- . 20, 1932 by Gerd Heymer, and in which there are
ther objects will be seen from the detailed speci?- used a plurality of lamps arranged in the plane
cation following hereafter.
Reference is made to the accompanying draw10 ings in which
Fig. 1 shows the condition‘ in exposing a lentic-
ular ?lm according to this invention;
Figs. 2 and 3 show ?lters for use in accordance
with the invention;
15
Fig. 4 shows some possibilities of arranging the
that would be occupied by the multi-color ?lter
or its- virtual image in the form of steps. Print
ing is thus effected that the point of intersection 10
of the ?lter middle lines in exposure lies within
the diaphragm of the printing objective which
projects the image of the original ?lm on the
printing ?lm. If the print shall be projected with
another ?lter distance than that‘ which is ?xed 15'
diaphragm with relation to ‘the objective and the
multl-color ?lter;
'
- Fig. 5 shows an arrangement for exposing a
r by the aforesaid condition a concave or a convex
lens may be inserted directly over the printing
lenticular ?lm with the aid of a multi-color ?lter
the ?lter middle lines which is determinative for
?lm which projects the point of intersection of
20 with repetition of the color sequence; and
'
Figs. 6, 7 and 8 show arrangements for printing
in accordance with the invention.
In application Ser. No. 446,323, ?led April 22,
1930' and matured into Patent No. 1,915,418,,Gerd
25 Heymer, one of the inventors of the present application, has described a process for printing a
lenticular ?lm on another lenticular ?hn by illuminating the negative ?lm through the em-
obtaining the correct color values to the required 20
distance, or generically expressed: the point of
intersection of the '?ltermiddle lines with relation
to the printing objective may be selected in such
a manner that its apparent distance from the
printing ?lm corresponds with the required dis
tance of the projection ?lter always subject to the
condition that the distance of this point from the
original corresponds with its distance from the
’
original in exposure.
30.
bossed side.
_
-
This process is connected with the drawback
that a printing objective of very large aperture
,
Inasmuch as the ?lter must be‘ arranged at a 30
relatively large distance from the objective in
must be used. In the co-pending application Ser. ‘ exposure, that is to say at a distance greater than
No. 636,056, ?led October 3, 1932, Gerd Heymer
the focal length of the objective, an objective of
has described a process which permits the use of
very large aperture must be used in order that
35' a printing objective with a smaller aperture by
no vignetting takes place. However, it has been 35
inserting a convex lens in the trace of the- rays foundthat an objective of large aperture can‘ be
directly behind the negative.
avoided if use is made of a ?lter with repetition
According to the present invention we have of the color areas, 1. e., a ?lter the simple color
_
found a process which permits the omission of sequence of which, red, green, blue is repeated
40 the aforesaid convex lens and simultaneously per- ‘entirely or partially in corresponding sequence
mits the use of a printing objective that must not on both sides of the middle group. The size of
have a very large aperture. This is attained by the exposure ?lter is such that the image of a
photographing the object under, such conditions
on a lenticular ?lm that the ?lter middle lines
45 that is to say the rays from the middle of the ?lter
to the middle of the lenticular elements, intersect
in a plane on the emulsion side of the ?lm, and
illuminating the original through the embossed
side under the same conditions which prevailed
color series red, green, blue projected on the emul
sion layer behind each lenticular element has
exactly the width of one lenticular element. In 45
order, when exposing the original ?lm, to ensure
completely uniform illumination of the picture
?eld, a mask of a certain shape may be inserted
in-the vicinity of the objective. This mask con
0 during exposure as regards the trace of the rays.
As a source of light there is used one which oper-
sists of one or more rectangular pieces, all pieces 50
of the same size having together such a width
ates under local separation of the colors, for instance, a diaphragm having illuminated apertures
arranged in the form of steps, so that a line
5 drawn in a direction perpendicular to the direc-
that, seen from the picture ?eld, only a whole
multiple of a-color sequence red, green, blue is
allowed to pass.
The process may, of course, also be applied to 55
2
2,129,205
other combinations of ?lters, for example to the
?lter for the lenticular bi-pack, i. e., a bi—pack
consisting of a lenticular front ?lm and an ordi
must be selected so that the value G shown in
Figs. 1 and 5, is equal to the distance G between
0 and N during printing. The source of light is
naryback ?lm, as described in the application
Ser. No. 608,829, ?led May 2, 1932 by Gerd Hey
arranged opposite the lenticular‘embossing of the
original N, namely, either, in accordance with
mer, and matured into Patent No, 1,968,944. In
one modi?cation the ?lter consists of a purple
and a yellow ?lter strip. In this case the color
U. S. Patent 1,915,418, there must be arranged a
diaphragm system, or, in accordance with the
strip sequence yellow, purple, takes the place of
10 the color strip sequence red, green, blue men
tioned above by way of example.
-The invention will now be further explained
with reference to the accompanying drawings:
Fig. 1 illustrates ?rst of all the production of a
15 printing ?lm to be used in accordance with the
invention. N is the original ?lm, A the exposure
objective with the front, focal point V. At F is
placed the exposure ?lter. F’ is the plane con
jugate with plane F and at a distance G from the
20 ?lm.
Figs. 2 and 3 illustrate examples of the shape
of the repetition color ?lter and the diaphragm.
Fig. 2 is a view of the ?lter as seen from the
middle of the picture ?eld. The middle portion
'25 of the breadth AB of the diaphragm allows just
the middle group of the repetition ?lter to pass.
To this middle portion of the diaphragm, for the
purpose of further utilization of the objective to-.
wards both sides, there are added portions of the
30 width CA and BD, namely in such a manner that
AC+BD=AB. In this way agreement of the ?l-_
ter for all points of the picture ?eld is ensured.
Fig. 3 shows the same diaphragm seen from a
lateral point of the picture ?eld. It will be rec~
35. ognized that the relation of the three colors has
remained unchanged, although the arrangement
of the strips is not the same as in Fig. 2.
Fig. 4 illustrates various possible ways of ar
ranging the diaphragm and the corresponding
40 widths.
ABCD is the repetition ?lter, E an ob
jective. Until striking the objective, the rays
are practically parallel and thence converge with
an inclination, which varies with the construc
tion of the objective, until they meet at the pic
45 ture point P.
In the case illustrated, the con
co-pending application Ser. No. 634,070, ?led
Sept. 20, 1932 by Gerd Heymer, there must be ar
ranged a step-shaped source of light in such a
manner that it is conjugate with F’. For this
purpose the source of light is arranged at
Lb, 12g, Lr and projected on the ?lm N by means
of the lens or lens system J.
Fig. 7 shows a modi?ed printing arrangement.
In this case in the arrangement shown in Fig. 6
the lens or lens system J arranged between the
?lm N and the source of light Lb, Li, L! is re
placed by lens or lens system J’ arranged direct
ly over the original N and focusing the source
of light‘ in the vicinity of the objective 0 or
within this objective.
Fig. 8 shows the same printing arrangement as
it is shown in Fig. '7 with the modi?cation that
a convex lens L has been placed directly over the
printing ?lm K, so that the ?lter image 1, g, b
is displaced to r’, g’, b’ at the distance P’ from
the printing ?lm. Therefore, the multi-color ?l
ter for projecting the print must also‘ be ar
ranged at the distance P’.
10
20
25
30
What we claim is:
l. A process of manufacturing lenticular prints
which comprises exposing a lenticular ?lm
through a multi-color ?lter arranged at a dis
tance from the taking objective greater than the 35
focal length of said ‘taking objective so that the
middle ?lter lines intersect. in a plane on the
emulsion side of said lenticular, illuminating the
original ?lm thus taken through the embossed
side under the same conditions as prevailed in 40
exposure as regards the trace of the rays and
under local separation of the colors, projecting
the point of intersectiomof the ?lter middle lines
at the same distance from the original ?lm as
said point had from the ?lm in exposure, project 45
ing the original on a lenticular printing ?lm
arranged with its lenticular elements facing the
emulsion side of said original, and displacing the
point of intersection of the ?lter middle lines
with relation to the printing ?lm to the distance 50
struction of the objective allows only two color
sequences red, green, blue to pass simultaneously.
The marginal portions of the diaphragm must
therefore be shorter, as in Figs. 2 and 3. Now,
50 as may be seen from Fig. 4, the width of the dia
_
phragm aperture must vary according to whether required for the projection ?lter.
2. A process of manufacturing lenticular prints
the diaphragm is placed in position I, II or III.
which comprises exposing a lenticular ?lm
However, in certain circumstances in cases in
which the number of the strips or the number of through a multi-color ?lter with repetition of the
sequence of color strips arranged at a distance 55
55 the ?lter units red, green, blue which can be
used when the objective is full open, is larger, . from the taking objective greater than the focal
length of said taking objective so that the ?lter _
the diaphragm may be omitted without impair
ing the balance of the colors to any considerable middle lines intersect in a plane on the emulsion,
side of said lenticular ?lm, illuminating the orig
extent.
inal ?lm thus taken through the embossed side 60
60
Fig. 5 illustrates the arrangement of a repeti
tion ?lter in which there is no fundamental al
teration of the course of ray as compared with a
?lter with a simple color sequence. Here also,
under the same conditions as prevailed in ex
posure as regards the trace of the rays and under
N is the original ?lm, A the exposure objective
65 with the focal point V: the repetition ?lter is
arranged at F. The plane F’ is conjugate with
the plane F. Its distance from the original=G.
Fig. 6 illustrates diagrammatically the arrange
ment in the printing process. Here again N is
70 the original ?lm, O the objective which projects
the original N on to the printing ?lm K. Now
point of intersection of the ?lter middle lines at
in order that the ?lter image of N may be lo
cated just in the vicinity of the objective 0 or
within the objective, the distance of the exposure
75 ?lter in the production of the original ?lm N,
local separation of the colors, projecting the
the same distance from the original ?lm as said
point had from the ?lm in exposure, projecting
the original on a lenticular printing ?lm arranged
with its lenticularelements facing the emulsion
side of said original, and displacing the point of
intersection of the ?lter middle lines with rela 70
tion to the printing film to the distance required
for the projection ?lter.
'
3. A process of manufacturing lenticular prints
which comprises exposing a lenticular ?lm
through ,a multi-color ?lter with repetition of the 75
2,129,205
sequence of color strips arranged at a distance
- from the taking objective greater than the focal
length of said taking objective so that the ?lter
middle lines intersect in a plane on the emulsion
lines intersect in a plane on the emulsion side of
side of said lenticular ?lm, masking the rays
said lenticular ?lm, masking the rays during ex
during exposure so that at least one sequence
posure so that sequences of color strips are visible
of color strips is visible when viewed from the
when viewed from the ?lm which sequences have
different lengths and the same breadth and the
strips forming one sequence having the same
?lm while avoiding vignetting, illuminating the
original ?lm thus taken through the embossed
10 side under the‘ same conditions as prevailed in
exposure as regards the trace of the rays and un
der local sep ration of the colors, projecting
the point of intersection of the ?lter middle lines
. at the same distance from the original ?lm as
15 said point had from the ?lm in exposure, project
20
3
sequence of color strips arranged at a distance
from the taking objective so that the ?lter middle
the point of intersection of the ?lter middle lines
with relation'to the printing ?lm to the distance
required for the projection ?lter.
4. A process of manufacturing lenticular prints
which comprises exposing a lenticular ?lm
through a multi-color ?lter with repetition of the
length while avoiding vignetting, illuminating the
original ?lm thus taken through the embossed 10
side under the same conditions as prevailed in
exposure as regards the trace of the rays and
under local separation of the colors, projecting
the point of intersection of the ?lter middle lines
at the same distance from the original ?lm as.
said point had from the ?lm in exposure, pro 15
jecting the original on a lenticular printing ?lm
arranged with its lenticular elements facing the
emulsion side of said original, and displacing the
point of intersection of the ?lter middle lines
with relation to the printing ?lm to the distance
required for the projection ?lter.
'
JOHN EGGER'I‘.
' GERD HEYMER.
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