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Патент USA US3036504

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May 29, 1962
R. WlCK
I
Filed Dec.
31,
1957
‘
_
‘
3,036,494
'PHOTOGRAPHIC COLOR PRINTER
-
’
'
'
3 Sheets-Sheet 1
Fig.7 '
INVENTOR.
Richard W/CK
BY
Adm [#7444 "
Maw?
May 29, 1962
R} WICK
3,036,494
PHOTOGRAPHIC COLOR PRINTER
Filed Dec. 31, 1957 _
'
3 Sheets-Sheet 2
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as
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4/68
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> INVEN TOR.
Richard WICK
BY
#90147
3,036,494
Patented May 29, 1962
1
2
3,036,494
enlarger head 3 is slidably or adjustably guided and sup
ported. Comprised in the head 3 is the printing light
PHOTOGRAPHEC COLOR PTER
Richard Wick, Munich, Germany, assignor to Agfa Ak
source 4, an optical condenser 5, a heat-protection ?lter
6, a mirror 7, a negative carrier 8 and the projecting
objective 9. Focussing means and other details not form
ing part of the invention are omitted from the drawing.
‘On the base 1 rests a copying frame it) which is equipped
tiengesellschaft, Leverkusen-Bayerwerk, Germany
Filed Dec. 31, 1957, Ser. No. 706,464
Claims priority, application Germany .lan. 12, 1957
11 Claims. (Cl. 88-24)
with a translucent screen 11 for focussing, an inner re
The present invention refers to photographic printer
devices, and more speci?cally to devices of this kind
adapted to reproduce color transparencies by photoprint
?ector 12 and a photo-cell 13 which forms part of an
exposure control device described further below. The
re?ector 12 serves to re?ect the light rays coming from
the source 4 and passing through sensitive paper placed
on the translucent screen 11 and through the latter,
mg.
It is a requirement in this art that the total exposure be
carried out in an automatic sequence of partial exposures,
that the individual exposures are automatically controlled 15
by suitable means, and that the alternatively operative
elements used for carrying out the partial exposures,
preferably the various color ?lters introduced into the
path of the printing light, be controlled automatically by
other suitable means.
' towards the photo-cell 13.
Accommodated within the enlarger head 3 are also
a blue ?lter 14, a green ?lter 15 and a red ?lter 16, each
of which is held in a corresponding ?lter holder 17, 18,
19, respectively, supported for sliding movement in a
direction perpendicular to the direction of the axis of the
beam of light between the mirror 7 and the frame 10.
There are further in the head 3 a set of solenoids 20, 21,
22 which are designed to cooperate with the respective
armature members 23, 24, 25, attached to the filter
holders 17, 18, 19, respectively, so as to move any one
As far as is known, in the past attempts have been
made to provide for a purely mechanical control of the
sequence of the various operations of the diversi?ed ele
ments of the color printing apparatus, e.g. by means of
cam shafts operating a number of electric switches, but 25 of them individually against the action of respectively
devices of this type were found unsatisfactory because
attached return springs 26, 27, 28 into a position in the
of their quite involved structure and delicate maintenance,
path of said beam of light, whenever any one of said
their considerable cost and certain inconvenient character
solenoids is actuated electrically in a manner and by means
istics like vibrations caused by the driving motor and the
described below.
inevitable noise developed by drive and power transmis 30 FIGS. 2 and 3 illustrate the electric circuits used for
sion to the switch actuators.
controlling both the exposure and the interposition of
It is a main object of this invention to avoid all the
the color ?lters between light source and negative.
drawbacks of known equipment by providing a compact,
The photocell 13 is preferably a photo-multiplier tube
simple and reliable apparatus of comparatively low cost,
which
is connected to the secondary winding of the line
and of vibration-free and noiseless operation.
35 supply transformer 33 via a high-voltage transformer 29
With above object in view, a photographic printer ac
and the alternatively connectible control Potentiometers
cording to the invention for reproducing an image from
3t}, 31, 32, respectively. In circuit with the cell 13 is
a transparency by a sequence of partial exposures on
the timing condenser 34 which in turn is in circuit with
photosensitive material comprises, in combination, a
the grid of a tube 35. In the particular example of an
combination of means for carrying out a plurality of
partial exposures in a predetermined sequence and with
embodiment of the invention the tube 35 is a cold cathode
thyratron. The anode potential is furnished from an
other line transformer 36 and a recti?er arrangement 37.
Connected in the anode circuit of the tube 35 is a relay
predetermined exposure times depending upon the density
of said transparency, and with selected modi?cation of
light for each partial exposure; circuit means intercon
coil 38 adapted to operate the switches 38a, 38b (FIG. 2)
necting said means for electrically operating the same; 45 and sac (FIG. 3). [Connected in parallel with the tube
and relays connected in said circuit means for automati
35 is the start switch 3?. The secondary winding 40 of
cally controlling the operation of all of said means.
the transformer 36 furnishes energy to the solenoids 20,
The novel features which are considered as character
21, 22, respectively.
istic for the invention are set forth in particular in the
It should be noted that the circuits of FIGS. 2 and 3
appended claims. The invention itself, however, both
as to its construction and its method of operation, to
are actually one circuit since the respective terminals 41
and 42 are to be considered as being permanently con
nected. The terminal 42 in both FIGS. 2 and 3 repre
gether with additional objects and advantages thereof, will
be best understood from the following description of
sents “ground.” The circuit portion of FIG. 3 contains
speci?c embodiments when read in connection with the
the
relay coils 43, 44, 45 which are to control the opera
accompanying drawings, in which:
55 tion of the color ?lters 14, 15, 16, respectively, and of
FIG. 1 is a diagrammatic elevation, partly sectional, of
the control potentiometers 36, 31, 32, respectively. The
an embodiment of the invention;
FIG. 2 is a circuit diagram showing part of the elec
trical means incorporated in the embodiment of FIG. 1;
FIG. 3 is another circuit diagram showing another part
of the electrical means; and
FIGS. 4, 5 and 6 illustrate diagrammatically certain
parts of the circuit of FIGS. 2 and 3 in various operational
positions.
Referring to FIG. 1, a photographic enlarger has a
base 1 assembled with a column 2 along which the actual
relay coil 43 operates the switch 43a in the circuit of
solenoid 20, and the switch 43b in the circuit of poten
tiometer 30. In a similar way the relay coil 44 is as
sociated with switches 44a, 44b, and relay coil 45 is
associated with switches 45a, 4512, said switches being
analogously associated with the solenoids 21, 22, respec
tively, and with solenoids 31, 32, respectively. Condens
ers 46, 47, 48 are respectively connected in parallel with
the relay coils 43, 44, 45, respectively.
The circuit portion of FIG. 3 shows also two coils 49,
aces/r94.
3
noid 2A) is energized and the associated blue ?lter 14 is
moved into position across the path of the light beam of
the not yet~switched~on lamp 4, while simultaneously the
corresponding control potentiometer 34} is connected into
switches are moved from one into the other position
thereof, but do not return into the previous position when
the energization of the relay is discontinued. These relay
switches are only returned to a previous position when
the relay is again energized. The ?ip-?op relay coil 49
‘4
switch 60:: and resistor ‘62., and ‘at the same time the
switches 43a, 43b are closed. In'this manner the sole
50 each constituting a ?ip-?op relay operating in such
a manner that when the relay is energized the associated
' the primary circuit of the high-voltage transformer 29.
In addition, the energization of the relay coil 43 causes
the thyratron ‘61; to obtain anode potential while the
?op relay coil 50 is connected directly between the lines 10 condenser 63 is charged via the resistor 64. As soon as
is connected between the feed line 51 and the stationary
contact 52 of the change-over switch 380, while the flip
coming from the terminal-s 41, 42, respectively, i.e. be
tween feed line 51 and ground. The relay coil 49‘ oper
ates the switch 4% located in series with the relay coil
50, and the change-over switch 4% to whose stationary
the condeuser63 and accordingly the grid of tube 61
(which grid had originally negative potential relative to
the cathode) have reached ‘a predetermined potential the
tube 61 ignites. Then the relay 6i) is energized, the switch
contacts the lines 53‘, 54, respectively, are connected. The 15 60a is opened so as to cut out the resistor 65, the switch
631; is closed so as to discharge the condenser 63, the
relay coil 5% operates the switches 59a, 50b which are
switch 600 is closed so as to switch-on the printing lamp
connected with the abovementioned line portions 53‘, 54,
4, and ?nally the switch 60d‘ is opened. In this manner
respectively, and cooperate with stationary switch con
the exposure of the sensitive paper assumed to be placed
tacts 55, 56, 57., respectively, associated with the relay
20 on the surface of the screen 11, for the color “blue” is
coils v43, 44, 45, respectively, as shown in FIG. 3.
Between the switch 4% and a line portion 58 con
' nected to the stationary contact 59 of the change-over
started.
,
The blue printing light passing through the ?lter 14and
through the color negative reaches the photocell 13 and
switch 38c are connected, in series with each other, the
generates therein a current the strength of which depends
relay coil 60, the thyratron 61 and a resistor 62 constitut
upon the proportional “blue-content” and upon the den
25
ing a delay circuit. In a circuit in parallel with the
sity of the negative, and which now charges the timing
means 66, 61, 62 are connected a charging condenser 63,
condenser 34. As soon as this condenser and accordingly
which is connected to the grid of tube 61, and a charging
the
grid of the tube 35 have reached a predetermined
resistor 64-. In parallel with the relay coil 60 and the
potential, the tube 35 ignites so that the relay coil 38 is
th‘yratron 61 is connected a resistor 65. Of course, the
cathode heating means 66 of the thyratron 61 is con 30 again energized. Consequently the switches 38a, 38b,
nected to the secondary winding 4% of the transformer 36
although this ‘is not indicated in the diagram.
The relay coil 60 operates the switch 6% for dis
connecting the resistor 65, the switch 6% for short
circuiting the condenser 63, the switch 600 (FIG. 2) for 35
switching-on the printing lamp 4, and the switch 6%
(FIG. 2) which is connected in parallel with the timing
380 are again moved into their respective second posi
tions, but are returned to the previous position immedi
ately after discharge of condenser 68 due to the interrup
tion of the anode current of tube 35 by switch 38b. On
account of the switch 330 having been moved for a brief
period into its second position, the ?ow of currentthrough
the tube 61 and relay coil 60 is also interrupted so that
the switches 6%, 6% are again closed, the switches 6017,
condenser 64 of the exposure control device.
one however are again opened. Hereby the printing lamp
In practice the whole arrangement operates as follows:
Before starting operation all parts and elements of the 40 4 is again switched oif and the “blue-exposure” is termi
nated and completed. The timing condenser 34 is also
arrangement are in position of rest, i.e. in the positions
discharged again.’
shown in FIGS. 1-3, and the whole circuit is without
As can be seen, due to the above mentioned moving
energy, but the grid of the thyratron 35 which ignites
of switch 38c for a brief period into its second position,
only at a higher grid potential, has the same-potential
as the cathode, while the anode of the thyratron 61 is 45 the ?ip-?op relay coil 49 has again received a brief cur
rent impulse whereby the switches 49a, 4% have been
without any potential because it is disconnected on
returned
into their initial position so that the ?ip-?op
account of the position of the switches 49b, 50a and 5012
relay coil Si) is de-energized but the switches 59a,
50b remain in connection with their contacts 55 and
position the automatic light control arrangement is 50 55, respectively, as is shown in FIG. 5. Conse
quently the relay coil 43 is de-energized and the blue
switched-on by actuation of the push-button switch 39.
?lter 14 is removed from its position across the light
This energizes the relay coil 38‘ so that the switch 38a
path (under the action of the associated return spring 26)
is closed, the switch 38b is opened and the switch 38c is
and the control potentiometer 30 is also switched off.
moved from contact 59' to contact 52. However by open
Meanwhile the relay coil 44 has been energized via the
ing the switch 381) the relay coil 38 is again de-energized
line portion 54; and the circuit containing the parts 65,
as soon as the condenser 68 which is connected in parallel
60a and 62. Consequently the switches 44a, 44b are
with the coil 38, has discharged. Hereby the switches
closed, the green ?lter 15 is moved into the light path of
33a, 38b, 360 are returned to their position of rest. The
the printing lamp 4 which is not yet switched on, and
condenser ‘69 being in parallel with a high-ohmic resistor
70 prevents immediate, unintended re-energization of the 60 the potentiometer 31 is connected in circuit. In the same
manner as in the above described case of “blue-exposure,”
coil 38 in case the push-button is held in pressed-down
‘ after a certain delay caused by charging the condenser
position longer than necessary.
63, the ?ow of current through the tube 61 and the relay
During the short period of switch 380 being in the posi
coil 60 is started so that the switches 60a, 60b are again
tion of contacting the contact 52, the ?ip-?op relay coil
49 has been energized brie?y whereby the switch 49a has 65 opened and the switches 60b and 600 are again closed;
therefore the “green-exposure" is started. It is terminated
been closed and the switch 4% has ‘been changed to estab
as shown in FIG. 3.
,
While the manual light control switch 67 is left in open
automatically in the same manner as was described for
lish connection with the line portion 53. For the reasons
the “blue-exposure,” after a predetermined amount of
“set forth above, the last mentioned switches remain in
green light has impinged upon the cell 13.
the now obtained positions even after the relay coil 49
Also after the completion of the “green-exposure” the
has been de-energized. On ‘account of closing the switch 70
relay coil 38 moves the switch 382: brie?y into its second
4911 also, the ?ip-?op relay coil 50‘ has been energized
position whereby the ?ip-?op relay coil 49‘ again receives
whereby the switch 50a has been changed from contact
a brief impulse so that the switches 49a, 49]) are again
57 to contact 55, and switch 59b has been closed, a con
changed over into their left-hand positions, respectively,
dition which is clearly illustrated in FIG. 4. Hereby the
relayicoil 43 is energized via line portion 53, resistor 65, 75 opposite to those shown in FIG. 3. Hereby the ?ip-?op
5
3,636,494
relay coil 50 is again energized so as to move the switches
ment, but e.g. is of substantial advantage in connection
with other types of photographic printing equipment in
as shown in FIG. 6. Consequently the relay coil 44 is
which the total exposure is composed of a plurality of
de-energized, the green ?lter is removed from the light
partial
exposures, and also in connection with contact
path and the potentiometer 3-1 is disconnected. Simul 5
printing apparatus. Moreover, the location of the photo
taneously, the relay coil 45 is energized and causes via
electric cell 13‘ is of no signi?cance for the scope and
switches 45a, 4512 the red ?lter 16 to be moved into
gist of the invention. For instance, the cell could be
the light path and the potentiometer 32 to be switched-on.
arranged so as to be in?uenced not by the colored light
The now following “red-exposure” is started automatically
in the same manner as described above for the “blue 10 that has passed through the sensitive material, but by the
light re?ected thereby. Or else, the cell could be in
exposure” and “green-exposure,” and after a predeter
?uenced ‘by rays of color light that are re?ected by a
mined amount of “red” has impinged upon the photo-cell
partially transparent mirror interposed in the light path
13 the “red~exposure” is automatically terminated.
between the negative and the sensitive material.
Also after completion of the “red-exposure” the relay
50a, 50b again into their respective right-hand positions
In order to establish a predetermined relation between
coil 38 moves the switch 380 once more brie?y into its 15
the photo-current and the light intensity or a certain
second position whereby the ?ip-?op relay coil 49 once
more receives a brief current impulse that moves the
switches 49a, 4% into their right-hand positions as shown
in FIG. 3. Hereby the relay coil 5t) is de-energized but
the switches 50a, 56b remain in the position in which
they were during the “red-exposure.” Consequently all
switches 49a, 49b, 50a, 5% have then returned into the
starting position as shown in FIG. 3.
By the last mentioned movement of switches 49a, 49b,
the relay 45 is de-energized so that the exposure in all
three colors is completed and terminated, and the whole
arrangement is entirely ready vfor a new cycle of operation.
It is evident that the amounts of light that are intended
to impinge upon the sensitive paper can be predetermined
spectrally differentiated sensitivity it may be useful to pro
vide several photo-cells, if necessary in connection with
correspondingly added switch means. Also optical scan
ning of the negative may be used for controlling the ex—
posure photo-electrically.
It will be understood that each of the elements de
scribed above, or two or more together, may also ?nd a
useful application in other types of photographic color
printer differing from the types described above.
While the invention has been illustrated and described
as embodied in automatic photographic color printer, it
is not intended to be limited to the details shown, since
various modi?cations and structural changes may be
made without departing in any way from the spirit of the
for each color individually by correspondingly setting 30 present
invention.
the respective control potentiometers 30, 31, 32.
The delay circuit consisting substantially of the com
ponents 61, 63, 64 and 66b serves to delay the switching-on
Without further analysis, the foregoing will so fully
reveal the gist of the present invention that others can
by applying current knowledge readily adapt it for vari
ous applications without omitting features that, from the
35 standpoint of prior art, fairly constitute essential charac
pletely moved into position across the light path and
teristics of the generic or speci?c aspects of this invention
until any vibration of the enlarger head 3 that could
and, therefore, such adaptations should and are intended
possibly be caused by the movement of the ?lters, has
to be comprehended within the meaning and range of
completely subsided. The amount of delay can be pre
equivalence of the following claims.
determined easily e.g. by properly dimensioning the re
of the printing lamp 4 by the action of relay coil 60, until
the color ?lter 14, 15 or 16, as the case may be, is com
sistor 64.
In a similar manner the condensers 46, 47, 48 cause
a delay of the de-energization of the relay coils 43, 44,
45, respectively, and thereby a delay of the removal of the
associated ?lters I4, 15, 16, respectively, from the light
What is claimed as new and desired to be secured by
Letters Patent is:
‘1. In a printing apparatus for producing photographic
color prints from a color transparency on light sensitive
printing material by a plurality of consecutive exposures
path so that an exposure of the sensitive material by white 45 of said printing material to printing light of respectively
light from the after-glow of the switched-off lamp 4‘ after
termination of the individual color exposure is safely and
different colors, in combination, light emitting means in
control circuit could be controlled, instead of being directly
actuated by the relay coil 60, by a separate relay coil,
tric cell located in the path of said printing light, for
automatically terminating each of said consecutive ex
cluding color control means, at least said color contol
means being movable for alternatively producing a beam
reliably prevented.
of printing light of any one of a plurality of different
The cutting-out of the resistor 65 by the switch 60a
which is in open position during the passage of current 50 colors adapted to pass through a color transparency;
moving means for successively moving at least said color
through the tube 61 and the relay coil 60, is intended to
control means into operative positions respectively as
prevent an overload on the relay coils 43, 44, 45 while
sociated with said plurality of diiferent colors; a single
the thyratron 61 is in ignited condition.
Of course, the switches 60c and 60d of the exposure 55 exposure time regulating means, including a photoelec—
posures after a duration varying in accordance with the
characteristics of the transparency whenever a predeter
switch, not shown, that would be operated by relay 60 mined quantity of said printing light of a particular color
involved in the respective exposure has illuminated said
coil 60.
photoelectric cell; controlling means for automatically
'It should be noted that also the exposure control cir
controlling said light emitting means in a cycle of said
cuit, i.e. essentially the circuit shown in FIG. 2, could
consecutive individual exposures of variable durations re
be modi?ed in various Ways without departing from the
quired for a complete color printing process and adapted
basic idea of this invention.
65 to successively actuate said moving means and to initiate
It can now be seen clearly that the arrangement ac
thereby consecutively said individual exposures of the
cording to the invention entails the great advantage that
respective color, said controlling means including a plu
the whole operation is made completely automatic due to
rality
of switch means and relay means for operating all
the exclusive use of relays and timing means. The delay
means in connection with the relays greatly increase the 70 of said switch means, respectively, said relay means be
ing in circuit with said exposure time regulating means;
reliability and trouble-free operation of the color printing
and circuit means interconnecting said light emitting
apparatus.
means, said moving means and said controlling means,
The application of the arrangement according to the
and for connecting said means with a source of electric
invention is not limited to enlarging equipment as referred
energy.
‘
to by way of example in above description of an embodi 75
2. In a printing apparatus for producing photographic
not shown, which could be connected e.g. to the second
ary winding 40 of the transformer 36 in circuit with a
8,036,494
7
color prints from a color transparency on light sensitive
printing‘ material ‘by a pluralityjof consecutive exposures
of said printing material to printing light of respectively
different colors, in combination, light emitting means for
alternatively producing a beam of printing light of any
one of a plurality of'diiferent colors adapted to pass
through a ‘color transparency; light selector means associ
ated with said light emitting means, including a plurality
8
energization- of saidlrelectrornagnetic moving means.
through said source of electric energy whenever, they are
to be’ energized; and circuit‘means interconnecting said
light emitting means and said- controlling means, and for
connecting said all of'said last mentioned means, respec
tively, with said source of electric’ energy.
4. A photographic color printer as set forth in claim. 3,
including individual delay means associated and connected
in circuit with said main relay coils, respectively, for de
of color ?lter means movable into and away from the
the de-energization of the respectively associated
path of said printing light, for alternatively selecting for 10' laying
main relay coils after the particular main relay coil has
each‘ of a series of consecutive exposures one of said
been disconnected by operation of atleast one of said
colors, respectively, of said printing light; moving means
input switches.
for successively moving said color ?lter means into and
5. A photographic color printer as set forth in claim
away from the path of said printing light; a single ex
posure time regulating means, including a photoelectric 15 3, wherein said exposure regulating means includes a plu
rality of control potentiometers connected in circuit with
cell located in the path of said printing light, for auto
said photocell and respectively associated with said plu
matically terminating each of said consecutive exposures
rality of color ?lter means, saidsmain relay means includ
after aduration varying in accordance with the charac
ing second relay contacts, respectively, individually asso- .
teristics of the transparency whenever a predetermined
and connected with said control potentiometers,
quantity of said printing light of a particular color has 20 ciated
respectively, for selectively connecting and disconnecting
illuminated said photoelectric cell; controlling means for
said potentiometers in and from the circuit of said photo
automatically controlling said light selector means in a
cell,
respectively, when said main relay coils are ener
cycle of said consecutive exposures of variable durations
gized and ‘dc-energized, respectively.
required for a complete color printing process and capa
6. A photographic color printer as set forth in claim 3,
ble of causing the selection, for each exposure, of the 25 including
a ?rst and a second ?ip-?cp-relay having each a
respective color of printing light by actuation of said
?ip-?op-relay coil connected in circuit with said source,
moving means and of initiating the individual exposures
the ?rst ?ip-?op-relay coil being capable of operating said
consecutively, said controlling means including a plu
two of said input switches connected in parallel with each
rality of switch means and relay means for operating all
other, and the second ?ip-?op-relay coil being capable of
of said switch means, respectively, said relay means be
operating said third one of said input switches; and includ- ing in circuit with said exposure time regulating means;
ing
a relay switch having contacts connected in series with
and circuit means interconnecting said light emitting
means, said moving means and said controlling means,
and for connecting all of said last mentioned means, re
spectively, with a source of electric energy.
3. In a printing apparatus for producing photographic
said ?rst ?ip-?op-relay coil and being operable also by
said second ?ip-?op-relay coil.
7. A photographic color printer as set forth in claim 6,
including second relay means having contacts for operat
ing said source of light and having a second relay coil ar
color prints from a color transparency on light-sensitive
ranged in series with said switch means so as to be con
printing material by a plurality of consecutive exposures
nected in series with any one of said main relay coils by
of said printing material to printing light of respectively
of said input switches.
different colors, in combination, light emitting means for 40 operation
8. A photographic color printer as set forth in claim I
producing alternatively a beam of printing light of any one
7, including a ?rst delay means connected in circuit with
of a plurality of diiferent colors adapted to pass through a
said‘ switch means for delaying the starting of a partial
color transparency; light selector means associated with
color exposure in favor of completion of said movement
said light emitting means, including a plurality of color
of
said color ?lter means caused by energization of one
?lter mews movable into and away from the path of 45 of said main relay coils before the start of the particular
said printing light, for alternatively selecting for each of a
partial color exposure upon energization of said second
series of consecutive exposures one of said colors, respec—
relay coil.
tively, of said printing light; a single exposure time regu
9. A photographic color printer as set forth in claim 7.,
lating means, including a photoelectric cell located in the
including a delaying circuit associated with said second
path of said printing light, for automatically terminating
relay coil for delaying the action of said second relay
each of said consecutive exposures after a duration varying '
means until after completion of the action of said main
in accordance with the characteristics of the transparency
relay means.
whenever a' predetermined quantity of said printing light
10. A photographic color printer as set forth in claim
of a particular color involved in the respective exposure
9,
including a second delay device connected with said
55
has illuminated said photoelectric cell; controlling means
exposure time regulating means for delaying said move
for automatically controlling said light selector means in
ment of said color ?lter means after completion of a
a cycle of said consecutive exposures of variable durations
partial color exposure in favor of complete elimination
and capable of causing the selection, for each exposure, of
of illumination of said printing material by said beam of.
the respective color of printing light and of initiating the
light after termination of an exposure by said exposure
individual exposures consecutively, said controlling means
time regulating means. I
including electromagnetic moving means for moving said
11. A photographic color printer as set forth in claim
color ?lter means, respectively, and a plurality of main
9 including individual delay means associated and con
relay means having control contacts in circuit with said
nected in circuit with said main relay coils, respectively,
?lter moving means, respectively, for controlling by ener
for delaying the de-energization of the respectively asso
65
gization of said moving means the movement of said color
ciated main relay coils after the particular main relay coil
?lter means, respectively, and individual main relay coils,
has been disconnected by'operation of at least one of
respectively, connected on one side in parallel with each
said input switches; and wherein said exposure regulating
other to one terminal of a source of electrical energy, said
means includes a plurality of control potentiometers con
controlling means further comprising three input switches,
two of said input switches being connected in parallel with 70 nected in circuit with said photo-cell and respectively asso
ciated with said plurality of color ?lter means, said main
each other and either one being in series with the third
relay means including second relay contacts, respectively,
one of said input switches, said input switches forming
individually associated and connected with said control
together input switch means connected with the other
side of said main relay coils, respectively, for alternatively
potentiometers, respectively, for selectively connecting and
controlling the movements of said color ?lter means by 75 disconnecting said potentiometers in and from the circuit
3,036,494
of said photo-cell, respectively, when said main relay coils
are energized and de-energized, respectively.
References Cited in the file of this patent
UNITED STATES PATENTS
2,484,299
Labrum ______________ __ Get. 11, 1949
2,500,049
2,518,947
Williams et a1 __________ __ Mar. 7, 1950
Simmon ____________ __ Aug. 15, 1950
2,665,065
2,691,917
2,764,060
2,841,065
2,847,903
10
Davidson ______________ __ Jan. 5, 1954
Curry ________________ __ Oct. 19,
Horak ______________ __ Sept. 25,
Gage et a1. ____________ __ July 1,
Modney ______________ .. Aug. 19,
1954
1956
1958
1958
FOREIGN PATENTS
‘ 1,135,521
France ______________ __ Dec. 17, 1956
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