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Патент USA US2112010

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March 22, 1938.
l. BRIMBERG
2,112,010
APPARATUS FOR PRODUCING PRINTING‘ PLATES
Fialed Oct. 28, 1929
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Patented Mar. 22, 1938
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UNITED STATES
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2,112,010
PATENT OFFICE
2,112,010
APPARATUS non PRODUCING ram'rmo
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Isaac Brimberg, Brooklyn, N. Y.
Application October 28, 1929, Serial No. 402,963
12 Claims. (Cl. 178—6.6)
This invention relates'to a novel method of an
apparatus for making black and white or colored
half-tone pictures in such a manner as to elimi
nate the'steps of engraving and etching in the
5 making of half-tone plates for newspapers.
In half-tone pictures as now made and in the
making of newspaper pictures they are formed
with a series of black dots on white areas and in
the darker portions of the picture are white dots
10 in, black areas and graduations from a round
black dot to a round white dot causes the black
dot to have more of a square contour.
In accordance with this invention half-tones
are produced by providing a variable dot fre
15 quency. In other words, in the white portions
are dots which are widely spaced and in the dark
the number of dots per inch by varying the fre
quency of the oscillator, it being understood that
one is not limited in any way to the frequency of
the oscillator or the frequency for light or dark
portions of the picture.
'
Other novel features of construction and ad
vantage and objects of the invention will herein
after more clearly appear in the detailed descrip
tion and the appended claims.
-
With the foregoing in view, my invention com- 10
prehends a novel method of’ and apparatus for
producing facsimiles, and plates for printing pic
tures in any desired color, and pictures and plates
resulting from such method.
v
It further comprehends a novel method and 15
apparatus for making a printing plate having
portions the dots are very close to each other. In varying dot frequencies.
order to produce such result these dots are, not
It further comprehends a novel method of mak
round but preferably form‘ a square‘ with indeni ing half-tone pictures on metal or mat.
:
20 tations in each side. This square arrangement
It further comprehends a. novel method of 20
of the dots enables one to obtain a denser black.
The dot.former consists of a needle or tool hav
ing its operative end in the form of a square with
tits sides slightly indented, or any other desired
25 shape that will make a good half or medium tone
picture or plate.
‘
If the dot forming needle is insulated from
the drum and ' a paper or sheet impregnated
with a substance which will change color upon
30 the passage of current instead of using a
softened metal to‘ receive the picture then fac
simile reproductions can be made in half-tone
or any other picture and even a black and white
“picture can be reproduced.
35
In accordance with my present invention a
point of light is transmitted through a ?lm into
a photoelectric cell. The metal in the receiving
end is preferably formed by a pulsating dot form
er instead of‘ by a machine tool so that it is
40 formed by indenting in contradistinction to cut
one or more colors.
It further comprehends a novel method and
apparatus which eliminates the use of engraving
and etching in newspaper reproduction of pic- 25
tures having any type of tone, half-tone or black
and white.
It further comprehends a novel method and
apparatus for facsimile picture transmission.
It further comprehends a novel dot former and 30
novel means for actuating it.
The invention further comprehends a num
ber of novel features‘which will hereinafter be
clearly set forth.
’
For the purpose of illustrating the invention, 35
I have shown in the accompanying drawing a
typical embodiment of it, which, in practice, will
give reliable and satisfactory results. It is, how.
ever, to be understood that this embodiment is
typical only and that the various instrumentali- 40
ties of which my invention consists can be vari
ened.
When facsimiles are reproduced, as above set
ously arranged and organized, and the invention
is not limited to the precise arrangement and
forth, synchronization is used between the trans
cation.
A further object of the invention is to devise
a novel machine wherein by increasing its speed a
5
making half-tone pictures in colors. containing
ting. The metal plate should be slightly soft
45 mitter and the receiver so that ‘pictures can be
sent by-wireless or any other means of communi
lighter
picture can be received because the dots
,
(become further spaced from each other.
A further object of the invention is to regulate I
the depth of the dots by varying the output level
of the last ampli?ed stage.
55 A further object of the invention is to control
i
organization of these instrumentalities as herein
set
forth.
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Figure 1 is an electrical diagram illustrative
of a mechanism which can be employed in carry
ing out my‘ invention.
'
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Figure 2 is a sectional elevation of a machine
which can be employed in carrying out the in- 50
vention, the illustration being partly diagram
matic.
:
Similar numerals of reference indicate corre
spondins Darts.
Referring ‘to the drawing:
55 '
‘
2,112,010
Referring ?rst to the electrical diagram seen
in Figure 1, l designates a light source which is
movable into a cylinder 2 which carries the ?lm
3 so that the light passing through the ?lm 3
causes a varying direct current in the photoelec
tric cell 4. These pulsations of the direct current
are ampli?ed by the photoelectric cell ampli?er
5. The output current of this ampli?er 5 causes
a varying current to flow in the coil 6 thereby
10 actuating a plunger 1 and causing the frequency
of the coil circuit 8 associated with the vacuum
tube 9 to vary in period depending upon the in
ductive variation of the coil 8. This ?uctuated
frequency is ampli?ed by any desirable type of
15 ampli?er i0. The‘output of the ampli?er ill
actuates the needle or tool ll of the dot im~
pressor l2.
The needle H forms the dots by indenting or
marking a metal paper or other receiver l3
carried by a revoluble support 14.
Referring now more particularly to Figure 2,
I5 is a base having a groove IE to receive a slide
I‘! which is moved by means of a shaft I8 of a
synchronous motor l9 ?xed to the base IS.
The
25 light source I is movable under the ?lm 3 and
one or more photoelectric cells 20 are employed
carried by a bar 2| connected with the slide I1.
This bar is indicated as being separated as at 22
for remote synchronization.
30
23 is a panchromatic ?lter which may be em
ployed if desired. The shaft i8 is grooved as at
.
needle I l'of the dot impressor and the cylinder l4,
facsimile work canvbe produced.
This invention is'not limited to the shape or
form of the transmitting head which may be
cylinder as shown, or a flat plate holder, keeping
in mind however that the transmitter and the re
ceiver must be run in synchronism.
The picture received is not limited to metal or
paper but may be impinged on any desired mate
rial, such as leather, stencil paper or wood or
any other devices for picture reproduction. The
light can be located either inside the transmitter
drum or ?lm holder or exterior of it and the same
holds true of the photoelectric cell.
By increasing the speed of the rotating ma
chine a lighter picture can be produced as the
dots become further spaced.
The depth to which the dots are formed can
be regulated by varying the output level of the
last stage of ampli?cation.
The number of dots per inch are controlled by
varying the frequency of the oscillator.
It will be clear that in accordance with this
invention one is not limited in any way to the
frequency of the oscillator or the frequency for
the light or dark portions of the picture.
In so far as I am aware I am the ?rst in the
art to devise the method herein set forth or to
make a plate having a varying dot frequency and
printed in any desired'color or colors or to re
produce for transmission by wireless or any other
24, for example, the grooves may be about sixty
to the inch, to cause the travel of the guide 25
?xed to the bar 2| on which is also mounted the
35 photoelectric cell 20 and the dot impressor I 2.
As before explained the ampli?ed varying cur
made, and its is therefore to be understood that
I desire my claims to such features to receive the
broad and generic interpretation to which a
pioneer in the art is entitled.
rent from the photoelectric cell 4 goes into the
coil 6 and varies the distance the plunger 1 goes
It will now be apparent that I have devised a
new and useful method of and apparatus for
into the primary coil 26 of the oscillator 9; or,
the ampli?ed varying current from cell 4 goes into
coil 6 and varies the degree of magnetic satura
tion of the plunger 1, thus varying the inductance
of the ‘coil 26 and varying the frequency of the
oscillator 9. This oscillator is a pure electric wave
oscillator of sixty to three hundred or more cycles
per second preferably.
This varying frequency
at ‘constant output of the oscillator varies the
number of dots per inch impinged on the metal
plate or paper mat l3. From this mat a plate
60 for a half-tone printing can be made.
If four photo cells are employed each having
its oscillating and amplifying circuits as shown
in Figure 1, four color plates can be made simul
taneously.
55
By placing photoelectric cells around the
periphery of the transmitting drum 2 associated
with the light i and by employing suitable
panchromatic ?lters 23 with each associated
photoelectric cell, a plate can be produced simul~
60 taneously in half-tone for one or more colors.
Each cell will have associated with it its cell
ampli?er, variable plunger, oscillator, ampli?er,
and dot impressor.
Thus for each color a half-tone impression in
Ga metal or any other material can be produced.
After removing each of these impressions from
the receiving drum or plate they can be inked
with their proper color, and then superimposed
70 one on the other to print a picture in rich half
tone colors or any other desired color com
bination.
If the receiving mat is impregnated with a sub
stance which will change color upon the passage
of current, and voltage is applied between the
3O
means of communication, pictures as herein
producing facsimiles and plates for printing pic
tures in any desired color, and pictures and plates 40
resulting from such method, which embodies the
features of advantage enumerated as desirable
in the statement of the invention and the above
description and while I have, in the present in
stance shown and described a preferred embodi
ment thereof which will give in practice satisfac
tory and reliable results it is to be understood
that this embodiment is susceptible of modi?ca~
tion in various particulars without departing
45
from the spirit or scope of the invention or 50
sacri?cing any of its advantages.
Having, thus described my invention What I
claim -as new and desire to secure by Letters
Patent, is:—
1. Anapparatus for making half-tone printing 55
plates or engravings, comprising means to scan
a picture or negative by light, means to translate
the picture shadings into electrical pulsations, an
oscillator having a resonant circuit actuated by
said electrical pulsations to produce a varying 80
frequency, amplifying means for said varying
frequency, and an engraving tool actuated by the
output from said amplifying means.
2. An apparatus for making printing plates or
engravings, comprising means to scan a picture or 65
negative, means to translate the picture shadings
into electrical pulsations, a purely electrical os-'
cillator actuated by said electrical pulsations to
produce a varying frequency, and an engraving
tool actuated by said frequency variations.
3. A machine for reproducing a picture on the
surface of a plate suit-able for printing, comprising
70
means to scan a picture or a negative, means to
translate the shading of the picture into electrical
pulsations, an oscillator having a resonant circuit 75
2,112,010
actuated by said electrical pulsations to produce
a varying frequency, amplifying means for said
varying frequency, an engraving tool actuated by
the output from said amplifying means, and
means to vary the frequency 'of said oscillator to
vary the spacing of the impressions.
4. A machine for making printing ‘plates or
engravings comprising means to scan a picture
or negative, means to translate the shading of
the picture into electrical pulsations, a purely
electrical oscillator actuated by said pulsations to
produce a varying frequency, an engraving tool
actuated by said varying frequency, and means
to vary the spacing of the impressions by varying
the frequency of the oscillator.
5. In the automatic engraving of a pictorial
subject, means for synchronously scanning the
subject and engraving a surface, means to trans
late the picture shadings into electrical pulsations,
an oscillator having a resonant circuit actuated
'by said pulsations to produce a varying frequency,
an engraving tool actuated by said varying fre
quency, and means to vary the level of said vary
ing frequency‘ to vary the depth of the impressions.
6. In the automatic engraving of a printing
plate, means for synchronously scanning ‘the pic
ture and engraving the plate, means to translate
the picture shadings into electrical pulsations, a
purely electrical oscillator actuated by said pulsa
tions to produce a varying frequency, an engrav
ing'tool actuated by said varying frequency, and
means to vary the depth of the impressions by
3
produce a varying frequency, an engraving tool
actuated by said varying frequency, and means
to vary the spacing of the impressions by varying
the speed of the transmitting and the receiving
surfaces simultaneously.
9. A machine for making half-tone surfaces for
printing in color, comprising means for synchro
nously scanning the subject photoelectrically and
engraving the surface, means for ?ltering the
color characteristics of said subject to produce 10
color separations, means including ‘a, resonant
circuit for changing the scanning pulsations into
frequency variations, and engraving means re
sponsive to said frequency variations.
10. An apparatus for the engraving of color 15
separation plates suitable for color printing, com
prising means for varying the frequency of a
purely electrical oscillator in accordance with the ‘
lights and shades of the subject to be reproduced
as modi?ed by each color ?lter, and a separate 20
engraving device actuated by the frequency va
riations.
11. An apparatus for automatic color separa
tion engraving, comprising means for synchro
nously scanning a colored subject and engraving 25
a printing surface successively for each color,
means to modify the light and shade character
istics of the subject with a color ?lter for each
scanning, means including a purely electrical os
cillator for changing the modi?ed scanning into 30
frequency variations, and an engraving device re
sponsive to said frequency variations.
varying the amplitude of said varying frequency. '
12. An apparatus for automatic color separa
T7. In a‘ ‘system of the class described, an oscil
tion engraving, comprising means for synchro
lator having a resonant circuit whose frequency
is varied in accordance with the picture shadings,
amplifying means for said varying frequency, an
engraving tool actuated by said amplifying means,
and means to vary the spacing of the impressions
by varying the speed of the transmitter and the
receiver simultaneously.
8. An apparatus for producing printing plates
or engravings- comprising means for synchro
nously scanning‘the picture and engraving the
' printing surface, means to translate the picture
' shadings into electrical pulsations, a purely elec
trical oscillator actuated by said pulsations to
nously scanning a colored subject and engraving 35
a surface simultaneously for each 'color, means
for ?ltering each color simultaneously, means to
translate the modi?ed scanning for each color
into electrical pulsations, means to amplify the
pulsations for each color, means including a reso 40
nant circuit for changing each ampli?ed pulsa
tion into, frequency variations, and means re
sponsive to said frequency variations to engrave
separate surfaces for each color suitable for direct
Printing.
'
ISAAC BRIMBERG.
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