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Патент USA US2106933

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Feb. 1; 1938.
A; H.‘ J. DE L. SAINT GENIES
2, 106,933
, nmaonucwxou OF LENTICULXR FILMS
Filed July 25, 1936
'
2 Sheets-Sheet l
Feb- 1,1938-
A. H. J. DE L. SAINT GENIES
2,106,933
REPRODUCTION OF LENTICULIAR FILMS
Filed July 25, 19:56
2 Sheets-Sheet 2
2,106,933
Patented Feb. 1, 1938
‘UNITED STATES PATENT OFFICE
2,106,933
REPRODUCTION OF naurrccma'mms
Anne Henri Jacques de Lassus Saint Genies.
Versailles, France
Application July 25, 1936, Serial No. 92,685
In France August 1, 1935
8 Claims. (01. 88-24)
,
pass through suitable gates. 01 O: are two bodies
The present invention has for its object meth
comprising the principal optical copying system. ,
S is a source of light located beyond the original
?lm AB on the optical axis of the optical copying
ods of copying lenticular films with the aid of
devices effecting suitable relative displacements
of the original and copy with respect to the copy
system. D, D’ are guards r'igid with the gates of
the original ?lm and copy ?lm respectively and
5 a ing optical system, which may be of small aper
ture.
The nature of these displacements and the
arranged in the planes of the zones of conver
gence of the respective ?lms. Each of these guards
is provided with a window d, d’ the periphery of
which is equal to the respective zones of con 10
vergence. R, R’ are screens movable relatively
to the ?lms and provided with windows r, r’ the
means for effecting them do not form the object
of the present invention; they have been cov
ered by the copending application of the samev in
ventor ?led on 2nd May, 1935 under the Serial
No. 19,490. The invention has for its object to
show the application of these means in the two
possible cases of orientation of the goffering of
15 the original, to render independent the angular
apertures of the elementary luminous beams of
the two ?lms facing each other, with the aid of
suitable auxiliary optical systems, to effect the
continuous unwinding of the two ?lms during
peripheries of which are equal to the conical pro
jections of the respective zones of convergence on
the respective planes of the ?lms from the centre
of the principal .optical system. The two ?lms
AB, A’B' are displaced homothetically relatively
to the optical copying system, the planes of said
?lms remaining parallel to one another during
this displacement and perpendicular to the axis 20
of. the principal optical system whilst the screens
20 printing, particularly when their gofferings are
, substantially transverse, and to show a particu
R, R’ are moved so that their windows remain
lar arrangement of the printer comprising a copy
ing optical system formed by two coaxial bodies
coincident with the projections of the zones of
with variable spacing.
convergence of the ?lms.
'
In Fig. 1, AB is the original ?lm, A’ 1B’1 the copy
It relates more particularly to such applica
tion of the additional lenses adapted either to
modify the aperture of the elementary beams of
?lm and 0 the principal copying optical system,
which may have a greatly reduced relative aper
ture. T is a divergent auxiliary optical system,
the two ?lms or to act on the relative positions
for instance, of focal length F2, giving a reduced
virtual image A131 of the original ?lm AB, this
a] lenses always remain parallel to the ?lms and image, being received by the principal optical sys
. at a constant distance from the latter, whatever tem 0, producing on the copy. film an image
A'1B'1; the enlargement obtained is a function
the orientation of the gofi’ering of the original.
of the combination 0 and T chosen. The image
The other objects and characteristics of the in
vention will be speci?ed in the description which‘ A’B' is that which the intervening optical system 35
_
follows, in the drawings'and in the appended 0 alone would furnish.
Owing to the displacements of the optical sys-'
tem O in its plane, accompanied by synchronous
Fig. l diagrammatically illustrates the print
ing system, employing additional optical systems displacements of the apertures d and d’ in their
respective planes, all the beams of the original are 40
40 T
' Fig. 2 illustrates the complete arrangement for transmitted to the copy in accordance with the
the case where the original ?lm is directed with details given in the copending application men
of the images of the source and of the zones of
30 convergence of the two ?lms, that these addition—
claims.
'
,
'
its go?ering towards the source.
tioned above and in accordance with the details
Figs. 3 and 4 illustrate the complete arrange- ' given in the following.
ment in the case of continuous unwinding of the
?lms, the distance of convergence of which is
?nite or in?nite.
'
-
Fig. 5 is a diagram of the complete mechanism
example chosen, brings onto the copy ?lm a rec
, ord of the elementary beams of an angular aper-_
according to the invention answering to the case .
50
where the principal optical system comprises
two coaxialbodies of variable spacing, and com
7 prising certain peculiarities in the kinematic con
'nections.
'
'
The optical system T, which is divergent in the
ture different from the aperture of the original
film; in the example under consideration, this
aperture is increased. This modi?cation of the
angular apertures involves, if desired, gofferings
of distinct characteristics for one or the other
Referring to Figure 5, AB is the original ?lm ?lm; these go?erings differ from one another, for
55 and A'B’ the copy ?lm, the ?lms being adapted to ' instance, in their pitch. only if the go?ered sup. 66
2
2,108,988
ports are of the same thickness and of the same
index. This modi?cation of the aperture also in
the optical system 0 instead of being directed
volves, if necessary, a modi?cation of the aper
ture r of the screens R described in the copending
In the two cases of the orientation of the go!
towards the source.
application, by increasing it on each side by the
fering, an additional optical system Ln, prefer
ably arranged in proximity to the original ?lm
value it for instance. The relative course of the
optical system 0 is, for the same reason, also
ployed for displacing the plane containing the
on the side of the optical system 0, may be em
modi?ed, passing from the value OsOn without
optical system T for instance, to the value wowm
greater than 000m with this optical system.
zone of natural convergence (where it is formed),
as well as the guard D or its image D1, and for
bringing an image of this zone into such a posi I0
tion chosen, on one side or the other of the ?lm,
for instance to coincide substantially with the
It is understood that instead of a divergent ad
ditional optical system T on the side of the orig
inal, a convergent additional optical system T’
plane containing the diaphragm of the principal
(Fig. 5) on the side of the copy, arranged, for in—
copying optical system 0.
stanceagain, in the aperture d’ of the guard D’,
In the systems described above, the useful rela 15
tive path of the objective 0 ensures the explora
tion, between the remotest limiting rays, of all
the elementary beams bearing on the aperture (1
of the guard D (simultaneously or successively,
according to whether the distance separating 0
from the ?lm AB is equal or not to the distance
of natural convergence).
In the case where the goffering of the ?lm AB
faces the source, Fig. 2, a slot S1 which plays at
also leads to an increase of the apertures of the
elementary beams recorded by the copy ?lm.
On the contrary, a divergent optical system T’
on the side of the copy would lead to a reduction
20 of the aperture of the elementary beams record
ed on the copy ?lm, in the same manner as a
convergent optical system ‘I’ on the side of the
original. It is obvious that the two means may
be combined to produce such a de?nite effect, for
example: divergent additional optical system T
on the side of the original, and simultaneously
'
any moment the part of a luminous source, re
of the objective 0 on the straight line joining the
centres of the macroscopic images of the ?lms.
S1 takes simultaneously with 0 (but on the other
side of the ?lm AB) a useful relative path be 30
tween the straight lines bearing on the edges of
the aperture d of the guard D andon the edges
of the image; these straight lines de?ne the limit
ing rays of the extreme elementary chambers.
The slot S1 then sweeps all the elementary cham~
Side of the copy, for increasing the apertures of
the elementary beams, and vice versa for reduc
ing the apertures etc.
The general copying process described in the
copending application is applicable to all types
of goffering, but at the cost of certain complica
tions when the go?erings are not simply cylindri
-. cal. of parallel directions and facing each other.
In the case where the go?erings, cylindrical and
facing each other, are not of parallel directions,
no complication of kinematic order is to be en
bers simultaneously and successively, according to
whether S1 is in the plane of the guard D or not,
whatever the convergence of this ?lm AB, posi
tive or'negative, and whether or not use is made
of an additional optical system L1 as mentioned 40
above.
If the luminous source is arranged beyond the
visaged and the different elements facing each
other are displaced in accordance with the same
general principle; it is necessary, however, that
the relative linear path of the objective should
be oblique to both directions of the goiierings of
guard D relatively to the ?lm AB, the sweeping
of the-elementary chambers is done successively.
If the source is in the plane of the guard D, simul
taneous sweeping of these chambers takes place.
If the source is contained between the plane of
the guard D and the ?lm AB, the methodical and
successive sweeping oi.’ the chambers must be ef
fected by the interposition between the source 50
and the ?lm, in closest proximity to the ?lm, of
the ?lms, being established preferably according
to one of the bisectrices of these directions such
that they are projected one on the other by the
copying optical system 0.
In the case where the go?erings, whatever their
types, are turned towards the illuminating source,
certain simpli?cations may be applied and cer
tain precautions taken in accordance with Fig. 2.
A guard D of aperture d must be arranged on the
side of the source. In the case of positive nat
ural convergence of the axes of the luminous
a movable screen R.
The aperture 1' of the
screen R of Fig. 2 is, as in Fig. 1, equal to the
projection of the aperture 0! of the guard D on
the planeof this screen; the centre of projection
beams of the original. this guard should prefer
ably coincide with the zone of natural conver
gence, or else an additional spherical or cylin
drical optical system L1 arranged in proximity to
is, in the case of Fig. 2, the centre of the slot Si,
while in Fig. 1 it is the centre of the objective 0.
In the case where the source is contained be
the ?lm on the side of the source must bring a
tween the guard D and the ?lm AB, it is pref—
virtual image of the said guard into coincidence
substantially with this zone. In the case of negatlve natural convergence, this optical system Ll
should give a real image D1 of the guard D, more
or less diiiracted by the ?lm, in its zone of nat
The guard D always remains
rigidly connected to the original ?lm. The same
applies to the guard D1 if it is materialized.
The ?nite or in?nite distances of convergence
of the axes of the elementary beams of the two
?lms facing each other are always in homothetic
relation according to the kinematic process ex
65 'ural convergence.
plained in the copending application.
The additional optical system L1 preserves its
above indicated function in the case where the
75 goffering of the original film is directed towards
25
mains incessantly aligned with the optical centre
convergent additional "optical system T’ on the
55
>
erably a point source or linear and parallel to
-
the llninglof the gofferlng, or, alternatively, it is
desirable that a second screen N for example,
contained between R and the source and pre
senting a slot as shown in Fig. 2, ensures the
correct canallzation of the luminous rays pro 65
ceeding from the window at of the guard D.
The diffusing power of the silver image of the
original film AB is generally lnsu?lcient to pre
vent the object 0 from giving, in the region of
the copy ?lm, an image of the source more or
less diffracted by the go?‘erlng of the original;
this image may be a cause of disturbances. To
overcome this, use may be made, in proximity
to the ?lm AB, on the side of the optical sys
tem O, of an additional optical system, which 75
3
8,100,088
may be the optical system 14 (generally a simple
of two India 01 and O: of variable spacing and
spherical or cylindrical lens) in order to con
struct, in combination, it necessary, with the
coaxial. At any moment of the rota.
tion of the. two frames and 01 the optical. sys
tem holder, and, for example, at the. moment
when this rotation is equal to a starting from
the mean position, each of these two bodies of
the optical system is then brought to rest at an
invariable distance from the film which it di
’ optical system 0, an image of the source S or
an image of the none of convergence containing
the source S, in a plane chosen relatively to
this optical system 0. Preferably, this plane is
that of the diaphragm of the optical system 0.
An additional optical system L: in proximity
10
to the copyp?lm may modify the distance of
natural convergence which would be acquired
by this ?lm remaining blank.
‘
oi’ each of these bodies 61 and 0;». This result
may be obtained, for example, with the aid of
nal and D’ or D’; on the side of the copy are,
rectilinear and parallel guides Pi and P2 rig
idly connected to 01 and 0; and maintained in
for one, two or three 0! them, materialized ac‘
cording to the opportunity or the possibility in’
contact with circular cam discs Kl and K2 hav»
ing their centres on the axes U1 and U2 of the
the different cases:
irames of the ?lms. A diaphragm common to
Or and 0: may be place-i approximately, in the
plane containing the axis ‘.3 oi'suspension of the
objective-holder and may present the largest 26
'ihe guards D or D: on the side of the origi
If the ?lms to be copied are cinematographic
films, if thn ’ goiieringe are transverse to the
,r films or so
tontialiy so, and parallel or substanq
to one another, and, ?nally, it
aamt-linens oi‘ ?lms are oi strictly parallel
directions, it
possihFe to observe the copying
procedure described above by maintaining im‘
, movable in the printer at the same time: the
optical system Q, the illuminating source and
'
rectly faces, this distance depending upon the
enlargement eiiected and'upcn the focal lengths 10
aperture which the useful luminous rays can
a?fect at any‘ moment, without, of‘ course, ex~
seeding the relatively small dimensions corre
sponding to the verification of the general pro
I3 Li
cedure.
The source S of suitable dimensions may be
the additional optical system L1, while the films '
either ?xed in the plane containing the three‘
unwind with continuous movements in a speed
‘axes of suspension under consideration, or mow
ratio equal tothe enlargement effected. Such a.
able in this plane, its displacement being, for
prigt‘er is diagrammatically illustrated in Figs. 3
example, controlled by a earn disc, so that its "
an
.
r
'
-
In Fig. 3, the distance of convergence of the
?lm AB is assumed to be ?nite; In‘ order that
the different apertures d- of the guard D equal
to one another and adjacent shall not ‘penetrate
one another, opaque partitions C, preferably
plain and ‘orthogonal to the ‘?lm and tolhe
guard D, are provided. These partitions sepa
image furnished by L: or by the combination of
L1 and In remains either in the plane of nat
ural convergence of the ?lm A3, or within or in
proximity-to the diaphragm of the optical sys~
tern O, as mentioned above.
a
v.
‘The orientation of the gc?ering of the ?lm AB
is, of course, immaterial in this case‘ as in the
foregoing cases.
'
.
rate the successive macroscopic images; they are
displaced at the same speed as the ?lm AB in
the direction ‘of the arrow, as well as the guard
D. As in the general execution otthe ‘process,
a guard D’ homothetic to the guard vD, with
I. In a‘system for copying gcifered ?lms with 40
the _'aid of a principal optical system of small
aperture, the plane of its pupil being different
partitions C’ may similarly accompany the copy
elementary beams of cache! said ?lms, supports
I claim:
from the zone of convergence of the axes of the
45 ?lm A'B' which is displaced in the opposite: for said ?lms, means to give to said ?lms and to 45
direction.
’
_
r
.
-,
-
Y'
The opticalv system In, which gives an image
S’ of B by concentrating the- luminous rays on
the optical system 0, will have a dimension such
50 that it a?’ects at any moment the whole or the
part of ‘the ?lm which corresponds to the path
necessary ‘for the complete reproduction or any
said principal optical system synchronous homo->
thetic relative displacements while remaining
parallel to one another and perpendicular to the
axis‘of said principal optical system, a source of
light placed beyond the original film on theop 50
tical axis of said principal optical system which
throughout the
copying
operation,
the centre of said optical system and the
centre of‘ the two ?lms, a guard rigidly connect
In Fig. 4; it
that the dis
tance oiconvergence was in?nite. It is the same‘ ed with the support of each ?lm, each provided
with a window the periphery of which is equal
general arrangement as in the above case. How
ever, matters are simplihed‘with respect to the ‘ to: said respective zones of convergence, and
guard D, which is advantageously replaced by - screens movable relatively to the ?lms in planes
a ?xed Tscreen R in close proximity to the ?lm, near to said films, said screens each having a
one of the‘elementary chambers.
_
and the aperture R of which isvicwed {mm the
optical system Q at the angle a corresponding as
much as necessary to the aperture of the ele-
mentor-y chambers.
windowthe. periphery of which is equal to the
conicaii projections of said respective zones of
convergence on \the respective planes of said 7.
?lms from the centre of said principal optical
an arrangement ‘ system. ‘said windows remaining coincident with
vIn Pig. 5, there is
of the whole 0! the oopying‘system where the said respective projections during their movement
plane (normal to the
the figure‘), which
relative to said ?lms.
,
contains the axes U1, U2 and U oi’
at “f 2., In a systemrfor copying go?ered ?lms with
the two supporting, frames of the ?lms and of the aid of a principal optical system of small
aperture,- the plane of its pupil being diii'erent
the obiective-holderis
these from
the zone of convergence of the axes of the 70
three
elements
electing
only
angular
synchro
70
of each of said ?lms, supports
vuousoscillating movements of the same anew. elementary
for said‘iilms, meansgto give‘to said ?lms and
‘to said principal-optical system_ synchronous
In order to beablcto elect this rotation with
’out displacing the axesv U1 and ‘U; with respect homothetic relative: displacements while remain
tude.
,
'
,
_
V
vYtotheaxisl‘l,theopticolay‘stemoiscouuuie'eti
ing paralieli’to
and perpendicular to
4
8,100,088
the axis of said principal optical system, a source
guide rigidly connected with each of said oh
of light placed beyond the original ?lm on the
optical axis of said principal optical system which
passes, throughout the copying operation, through
of light placed beyond the original ?lm on the
the centre of said optical system and the centre
of the two ?lms, a guard rigidly connected to the
support of each ?lm, each provided with a win
dow the periphery of which is equal to said re
spective zones of convergence, auxiliary optical
jectives and bearing on said cam discs, a source
optical axis of said principal optical system
which passes, throughout the copying operation,
through the centre of said optical system and the
centre of the two ?lms, a guard rigidly‘ connected
with the support of each ?lm, each provided with
a window the periphery of which is equal to said
systems arranged in the window of said guards respective zones 01' convergence, and screens mov 10
for modifying the aperture of the elementary able relatively to the ?lms in planes near to said
light beams emanating from the original ?lm ?lms, said screens each having a window' the
periphery of which is equal to the conical pro
and impinging on the copy ?lm, and screens mov
able relatively to the ?lms in planes near to said
?lms, said screens each having a window the
jections of said respective zones of convergence
periphery of which is equal to the conical pro
centre of said principal optical system, said win
dows remaining coincident with said respective
projections during their movement relative to said
jections of said respective zones of convergence
on the respective planes of said ?lms from the
centre of said principal optical system, said win
20 dows remaining coincident with said respective
projections during their movement relative to
said ?lms.
3. In a system for copying go?ered ?lms with
the aid of a principal optical system of small ap
erture, the plane of its pupil being different from
the zone of convergence oi‘ the axes of the ele
mentary beams of each of said ?lms, supports
for said ?lms, means to give to said ?lms and
to said principal optical system synchronous ho
30 mothetic relative displacements while remain
ing parallel to one another and perpendicular to
the axis of said principal optical system, a source
of light placed beyond the original ?lm on the
optical axis of said principal optical system
which passes, throughout the copying operation,
through the centre of said 033*“ 1 system and
the centres of the two ?lms, a
tional optical
40
systems near to said ?lms for modifying the dis
tances of the zones of converge :e of said ?lms,
guards each having a windo'» we periphery of
which is equal to the respective modi?ed zones
of convergence of said ?lms,
guards being
arranged in planes coinciding with said modi?ed
zones of convergence of said ?lms and being rig
idly connected to said ?lm supports, auxiliary
optical systems arranged in the window or said
guards for modifying the aperture of the ele
mentary light beams emanating from the orig
inal ?lm and impinging on the copy ?lm, and
50 screens movable relatively to the ?lms and in
on the respective planes of said ?lms from the
?lms.
5. In a system for copying go?‘ered ?lms with 20
the aid of a principal optical‘system of small
aperture, the plane of its pupil being different
from the zone of convergence of the axes of the
elementary beams oi.’ each of said ?lms, supports
for said ?lms, ?xed and parallel axes passing .
respectively through the planes of the ?lms and
through the centre of symmetry of the principal
optical system, means to oscillate said ?lm sup
ports and said optical system about said axes to
produce synchronous homothetic displacements
of said ?lms relatively to said optical system,
two objectives forming said principal optical sys
tem and respectively remaining at constant dis
tance from the plane of the corresponding ?lm,
30'
two circular cam discs rigidly connected to the .
?xed axes passing through the planes of said
?lms, a guide rigidly connected with each of said
objectives and bearing on said cam discs, a source
of light placed beyond the original ?lm on the
optical axis of said principal optical system which 40
passes, throughout the copying operation, through
the centre of said optical system and the centre
of the two films, a. guard rigidly connected to the
support of each ?lm, each provided with a window
the periphery 01’ which is equal to said respective
zones of convergence, auxiliary optical systems
arranged in the window of said guards for modi
fying the aperture of the elementary light beams
emanating from the original ?lm and impinging
on the copy ?lm, and screens movable relatively 50
planes near to said ?lms, said screens each hav
ing a window the periphery of which is equal to
the conical projections of said respective zones
of convergence on the respective planes of said
to the ?lms in planes near to said ?lms, said
screens each having a window the periphery of
?lms from the centre of said principal optical
system, said windows remaining coincident with
said respective projections during their move
aperture, the plane of‘ its pupil being different
planes of said ?lms from the centre of said prin 55
cipal optical system, said windows remaining co
incident with said respective projections during
their movement relative to said ?lms.
6. In a system for copying go?ered ?lms with
the aid of a principal optical system of small 60
aperture, the plane of its pupil being di?erent
from the zone of convergence of the axes of the
from the zone of convergence of the axes of the
ment relative to said ?lms.
4. In a system for copying gofiered ?lms with
60 the aid of a principal optical system of small
elementary beams of each of said ?lms, supports
for said ?lms, ?xed and parallel axes passing re
65 spectively through the planes of the ?lms and
which is equal to the conical projections of said
respective zones of convergence on the respective
elementary beams of each of said ?lms, supports
for said ?lms, fixed and parallel axes passing re
through the centre of symmetry of the principal
optical system, means to oscillate said ?lm sup
spectively through the planes of the?lms and
‘through the centre oi’ symmetry of the principal
optical system, means to oscillate said ?lm sup
ports and said optical system about said axes to
ports and said optical system about said axes to
produce synchronous homothetic displacements
of said ?lms relatively to said optical system, two
objectives forming said principal optical system
produce synchronous homothetic displacements
of said ?lms relatively to said optical system, two 70
objectives forming said principal optical system
and respectively remaining at constant distance ' and respectively remaining at constant distance
from the plane of the corresponding ?lm, two
circular cam discs rigidly connected to the ?xed
75 axes passing through the planes of said ?lms, a
from the plane of the corresponding ?lm, two
circular cam discs rigidly connected to the said
?xed axes passing through the planes of said 75
5,
9,106,988
planes near to said ?lms, said screens each hav
?lms, a guide rigidly connected with each of said
ing a window the periphery of which is equal
to the conical projections of said respective zones
of convergence on the respective planes of said
?lms from the centre of said principal optical
objectives and bearing on said cam discs, a
source of light placed beyond the original ?lm
on the optical axis of said principal optical sys
iii tem which passes, throughout the copying opera
tion, through the centre 01' said optical system' system, said windows remaining coincident with ,
and the centres of the two ?lms, additional optical said respective projections during their move
ment relative to said ?lms, a supplementary
systems near to said ?lms for modifying the dis
tances of the zones of convergence of said ?lms, guard integral with the ?lm gate of the original
guards each having a window the periphery of film, an image of which given by said additional 10
which is equal to the respective modi?ed zones "optical system coincides with the modi?ed posi
tion oi the zone of convergence of the ?lms, and
a screen providedwith a slot in vcoincidence
at convergence of said ?lms, said guards being
arranged in planes coinciding with said modi?ed
with said optical axis of the principal optical
system, said additional optical system giving an
zones or convergence of said ?lms and being rig
: idly connected to said ?lm supports, auxiliary
image of this slot situated on. said principal
optical systems arranged in the window 0! said
guards for modifying the aperture of the ele
mentary light beams emanating from the original
20
optical system.
him and impinging on the copy ?lm, and screens
movable relatively to the ?lms and in planes near
to said ?lms, said screens each having a window
the periphery of which is equal to the conical
projections of said respective zones of convergence
on the respective planes at said ?lms from the
centre oi said principal optical system, said win
dows remaining coincident with said respective
projections during their movement relative to said
?lms.
.,
>
~
'1. In a system for copying goi'iered ?lms with
30 the .aid of'a principal optical system of small
aperture, the planeoi its pupil being diiierent
i
‘
8. In a system ior copying go?ered ?lms with
the aid or a principal optical system of small
aperture, the plane of its pupil being different 20
from the zone of convergence oi.’ the axes of the
elementary beams oi each 01' said ?lms,-supports
for said ?lms, means to give to said ?lms and to
said principal optical system synchronous homo
thetic relative displacements while remaining
parallel to one another and perpendicular to
the axis of said principal optical system, a source
of light placed beyond the original ?lm on the
optical axis of said principal optical system
which passes, throughout the copying operation,
through the centre of said optical system and
30
the centresoi the two ?lms, a\ guard rigidly
connected with the support of each ?lm, each
provided with a window the periphery of which i
is equal to said respective zones of ‘convergence, 35
35 said principal optical system synchronous homo
thetic relative displacements while remaining screens movable relatively to the ?lms in planes
parallel to one another and perpendicular to near to said ?lms. said screens each having a
from the zone 01 convergence of the axes of the .
elementary beams of each of said ?lms, supports
for said ?lms, means to give to said ?lms and to
the axis of said principal optiealsystem, a source ' window the periphery of which is equal to the
of light placed beyond the original ?lm on the conical projections of said respective zones of" '
convergence on the respective planes of said 40
40 optical axis of said principal optical system
which passes, throughout the copying operation, ?lms from the centre 01' said principal optical
through the centre 0! said optical system and system, said windows remaining coincident with
the centres oi the two ?lms, additional optical said respective projections .during theirv move
systems near to said ?lms for modifying the ment relative to said ?lms, the lenticulations
_ distances of the zones'oi convergence of said of the two ?lms being transversal to their direc-v 45
?lms, guards each having a window the periph- tion of displacement, and an additional ‘optical
ery or which is equal to the respective modi?ed system provided near to the original ?lm, bezones of convergenceof said ?lms, said guards tween said ?lm and said light source, giving an
being arranged in planes coinciding with said image 0! said light source on said principal
’ optical system, said additional optical system 50
50 modi?ed zones of convergence 0! said ?lms and
being rigidly connected to said ?lm supports, being located in said window 0! said screen mo'v- "
55
auxiliary optical systems arranged in the win
dow or said guards for modifying the aperture
of the elementaryv light beams emanating from
the original ?lm and impinging on the copy ?lm.
screens movable relatively to they ?lms‘ and in
able relatively to the ?lms which displace them
selves at constant speeds. I
ANNE mm: JACQUES
I
n LABBUB s'r. Gimme.
'st
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