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Ocpzz, 1946.
1
E. .1. STAUD I
2,409,990
TRACING CLOTH
‘
Original F‘íl‘ed Sept.l 16, 1943
2 Sheets-Sheet 1
FIG. I.v
' PRINTING LIGI-IT
S15
YEL'Low FILTER
PAPER
NEGATIVE IMAGE OF DRAWING
ORTHO SENSITIVE EMULSION
A
||"
'~
MAGENTA DYED LAYER
'
TRAcING cLoTI-I
ORTHO EMU‘LSION AND POSITIVE IMAGE
MAGENTA DYED LAYER
TRAcING cLoTI-I
BLU’EPRINT PAPER
ORTI'IO SENSITIVE EMULSION
/NITRATE OR ACETATE, DYED
WITH SUBSTANTIALLY PERMANENT
MAGENTA DYE
a`TRAcINc; cLoTH BASE A
CYRIL J. STAUD
INI/'ENTOR
B'Y
'
.
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'
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ATTQRNEYS __
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09.291946.
I
QJ, STAUD
~
~
2,409,990
TRACING CLOTH
"
Original Filed Sept. 16, 1945
l
Sheets-Sheet 2
F'IG.5.
2.0
DENSITY A
40o
_
‘
50o
wAvELENGTH, m,L
_
«
60o
‘
CYRIL J. STAUD
INVENTOR
@bmw/.0mm
Patented Oct. 22, 1946
2,409,990
UNITED STATES PATENT OFFICE
2,409,990
TRACING CLOTH
Cyril J. Staud, Rochester, N. Y.
Original application September 16, 1943, Serial
No. 502,591. Divided and this application Octo
ber 28, 1944, Serial No. 560,873
9 Claims. (Cl. 95-5)
1
2
The present invention relates to photographic
materials and ’prints made therefrom, and is a
division of my copending application 502,591, filed
September 16, 1943. More specifically, the inven
dye which will effectively protect the emulsion of
the member against halation.
Still another object of the invention is the pro
tion relates to a sensitized tracing cloth which
may be exposed to a drawing or a negative thereof
to form an image thereof on the cloth, and which
may then be used to print the image onto blue
print or other copying paper.
vision 0f a permanent anti-halation material
which will absorb the light rays used to expose
the emulsion to prevent halation thereof, but will
freely transmit the light rays used in the `print
ing operation.
‘
'
Yet another object of the linvention is the pro
Some diñîculty has been experienced from time 10 vision of an emulsion and an anti-halation com
to time in the use of photographic tracing cloth
bination which will enable the emulsion to
as a result of halation produced by the diffuse
be exposed to form an image thereon by
reflection of light from the cloth into the emul
mean of a light of one color, and which will
sion, with the resultant widening of the lines in
enable the printing of the image by means of a
the image of the drawing. This effect, while 15 light of another color.
'
not usually serious, has in certain cases become
To these and other ends, the invention resides
objectionable in the aircraft industry.
in certain improvements and combination of
In order to overcome this diñ’iculty, the pres
parts, all as will be hereinafter more fully de
ent invention proposes that instead of using a
scribed, the novel features being pointed out in
blue dye in the cloth, as is present practice, an 20 the claims at the end of the specification.
antihalation layer containing a permanent or
In the drawings:
`
water insoluble magenta or blueA dye or dye mix
Fig. 1 shows the method of printing' a positive
` ture be provided.
This dye or dye mixture will
image of a drawing onto a paper negative to form
absorb strongly in the green and will be trans
parent to or will transmit freely the blue or the
blue and red. On a tracing cloth thus colored,
an orthochromatic emulsion would be coated.
a negative image thereon;
Fig. 2 shows the arrangement of the printing
light, the paper negative and the tracing cloth
of the present invention during‘exposure of the
emulsion of the cloth to form a positive image
On exposing the emulsion of the tracing cloth
to the negative of the drawing, a yellow filter
would be used to absorb blue light and transmit
of the drawing thereon;
‘
‘ `
'
Fig. 3 shows the arrangement ofthe printing
red and green. The dye in the antihalationj` ` light, the tracing cloth with its developed and
layer would absorb any green light which would
fixed positive image, and the blueprint paper. in
pass through the emulsion, and would, therefore,
position to have the positive image printed there
prevent halation thereof and thusprovide a posi
on;
tive image on the cloth which is a true and exact 35
reproduction of the original drawing. `On the:
other hand, blue light would bel freely trans
mitted by the dye during the printing operation,
'
.
Fig. 4 is a sectional view of the "tracing cloth
constructed in accordance with the'present in
’ vention; and
i
‘
i
Fig. 5 is a spectrophotometric absorption Curve
and it would, therefore, be unnecessary to remove
of one dye suitable for use in the anti-halation
this dye from the tracing cloth. By means of 40 layer ofthe cloth illustrated in Fig. 4.
this arrangement, the positive image on the trac-`
. Similar` reference numerals throughout the
ing cloth may be utilized to print onto ‘blueprint
various views indicate the same parts.
paper a positive image which is a substantially
Referring tothe drawings, Fig. 4 shows a trac-`
true reproduction of the Original drawings and
ing cloth constructed in accordance with ‘the
superior to reproductions made by prior methods.
present invention, and comprising a support I l
The present invention has, therefore, as its`
of untinted cloth which is rendered translucent
principal object, the provision of a photographic
or light transmitting in any suitable and well
member on which may be produced an accurate,
known manner. The «base ll is coated with an
halation free, image of a drawing. This mem
under layer I2 of cellulose acetate‘or nitrate con
ber may then be utilized to formsubstantially 50 taining an anti-halation materia-lin the form of
accurate working-prints of `such a drawing on `a
a dye or dyes which will absorb strongly'in the
suitably sensitized support. “
green, but transmit freely in the blue or blue and
Another object of the invention is the pro
red. So far as is known, no satisfactory method
vision of a photographic member having a sub
‘ has been devised'for incorporating a removable
bing layer containing a permanent anti-halation 55 anti-halation dye of this type in an under layer. '
2,409,990
3
4
For this reason, the present invention proposes
transmitted by the emulsion may be allowed to
the use of a permanent or water-insoluble dye
pass through the layer I2 as the emulsion is not
or dyes which will remain in place during the
sensitive thereto, or, if preferred, the anti-hala'
processing of the tracing cloth, and which will
tion dye or dyes may be blue, absorbing both
lbecome a permanent part thereof. Any dye or 5 green and red light. Thus, the emulsion layer
dyes meeting these requirements may be used.
I3 of the tracing cloth is exposed by a light of
For example, a permanent water insoluble ma
one color (green) to form' a latent positive image
genta-color dye having the chemical formula 1,4
diamino-Z-methoxyanthraquinona the spectro
of the drawing It. The latent positive image is
then vdeveloped and fixed to provide a visual ,pos
photometric absorption curve of which is shown 10 itive image 25.
in Fig. 5, is suitable. It is seen from this curve
The tracing cloth with its positive image 25 is
that this dye has a strong absorption inthe
then positioned in the manner shown in Fig. 3, on
green and also absorbs somewhat in the orange,
aA blueprint paper 26 having a blue or violet sen
but is completely transparent in the violet to 420
sitive coating or emulsion 2l. For the purpose
mu and transmits blue freely to about 460 mu. 15 of clarity the tracing cloth and blueprint paper
The cloth base thus colored is coated with' an
are shown. slightly separated. In actual practice
orthochromatic emulsion I 3. A cloth base thus
they are in direct contact. A white printing light
provided with an under layer containing a per
28" is then passed through the 'tracing cloth, in
manent magenta dye and coated with an ortho
the manner clearly shown in Fig. 3, to print the
chromatic emulsion will be free from halation 20 positive image 25v onto the emulsion layer 2l to
when exposed by green light.
form thereon a positive image whichY is substan
The tracing cloth, above described, is intended
tially identical with the positive image> 25 on the
tracing cloth. During this passage of the print
ing light through the tracing cloth, the dye -or
similar material. In making such blueprints, it 25 dyes in the under layer I2 will absorb the light
is desirable that the lines thereon be substantially
rays of the green portion of the spectrum but
identical to those of the original drawings. To
will freely pass or transmit the blue‘or blue and
for use in forming images of a drawingv or similar
designation on a sensitized blueprint paper or
secure this' result, a negative is iirst made of the
red rays. The transmitted blue rays are then,
drawing, and then the orthochromatic emulsion
eiïective in exposing or printing the emulsion on
layer I3 of the tracing cloth is exposed to the 30 the light sensitive layer 2ï', as is apparent. Thus,
negative to form an halation-free positive image
the printing of the blueprint paper is secured by
which is an exact reproduction of the original
exposing the emulsion layer El thereof to alight
drawing. This positive image is then trans
ferred, by printing, onto the blueprint paper to
provide av substantially true and accurate repro
duction of the original drawing which may then
be used` as a working drawing in a manner well
known. By means of this method, the blue
prints are substantially exact reproductions of the
of another color, blue, which is not» absorbed by
layer I2. After the printing is complete, the im
age on the .blueprint paper is'developed` and iixed
to provide a positive image which is a substantial
duplication or reproduction of the image ofthe
original drawing. The blueprint may then be
used as working drawing, the advantages of which
original drawings and are more accurate than 40 are apparent to those skilled in the art. ‘
blue prints made by prior methods.
Figs. 1 to 3 show the various steps in the for
mation of the final positive image of the blue
print paper. In Fig. l, the drawing paper I5
By means of thev above method, the image I6
of the drawing may be accurately transferred'v> to
the vblueprint paper 25 to provide a working draw
with its drawing or image I6 is placed on a suit 45 ing, the lines of which are substantial duplicates
of the original-drawings. Furthermore,- the in
able negative paper I‘I such as “Kcdalith” nega
clusion of the permanent magenta dye in the
tive paper, having an emulsion layer I8. The
under layer I2 serves to prevent halation of the
printing light I9 is then passed through the
‘ drawingin the manner shown in Fig. l to expose
emulsion layer I3, yet freely passes or transmits
'the emulsion I8 to form a negative image of the 50 the light rays utilized in the printing operation.
drawing I i5 thereon, as is apparent. The negative
While one embodiment of the invention. has
image» in the emulsion I8 is then developed and
been disclosed, it is to be understood that the
fixed in the manner well known in the art.
inventive idea may be carried out in a number
The negativev is then arranged to overlie theV
of ways. 'I‘hisl application is, therefore, not to be
tracing cloth, see Fig. 2, so that the visual nega 55 limited to the precise details> described, but is in
tive image 2I thereon engages the emulsion layer
tended to cover all variations and modifications
I3l of the tracing cloth. For the purpose of clar
thereof falling within the scope of the appended
ity the negative and tracing cloth are shown
slightly separated, but it will be understood that
I claim:
in practice they are in actual contact. Ay yellow 60
1. The process of forming a positive photo
ñlter 22 is used during exposure and is positioned
graphic print on a material which is sensitive to
between they exposing light 23 and the paper neg
only one region of the visible spectrum, compris
claims.
ative. This yellow filter will absorb blue,>but will
4freely transmit green and red. The transmitted
green light will expose the orthochromatic emul
’
`
Y
Y
.
ing, providing a printing member` havingfan` emul
sion which is sensitive to Ysaid one region andiat
least to another region and having an’ anti-hala
tion layer which is transparent to> light rays of
therein a latent positive image of the original
said one region but which will absorb light‘ïrays Y
drawing I6, as will be apparent. The green light
from said other region to prevent Vhalationr'of
which is effective in exposing the emulsion I3
said emulsion, exposing said emulsion to a nega-V
passes through the latter and is absorbed by the 70 tive by means of a light containing light rays of
above-mentioned magenta dye in the under layer
said other region to Vform a positive image on
- sion, which is green and blue sensitive, to form
I2, thus effectively preventing halation of the
positivefimage in the emulsion I3 on the tracing
. cloth to provide a sharp, clear and true repro
said emulsion, developing and ñxing said posi
tive image, and printing said positive image onto
said material by exposing the image to lig-ht
duction of the original drawing. The red light 75 rays of said one region which are freely trans
2,409,990
5
6
mitted by said anti-halation layer to produce a
positive image on said material.
emulsion by passing a green light through the
negative and the emulsion to expose the latter,
2. The process of forming a positive blue print
allowing said light to then pass into a layer
having a coating sensitive only to the blue region
containing a magenta anthraquinone dye which
of the spectrum, comprising, providing a printing
will absorb the green light to prevent halation of
member having an emulsion which is sensitive to
said emulsion but which will freely transmit blue
the blue region of the spectrum and is sensitive
light, developing and ñxing the emulsion on said
to light rays in other regions of the spectrum and
member, and then printing on said material by
having an anti-halatîon layer which is transpar
passing a blue light through said emulsion and
ent to light rays in the Iblue region but which will 10 dye layer.
absorb light rays of said other regions to pro
'7. The process of forming a positive photo
tect the emulsion against halation, exposing said
graphic print on a material sensitive to only the
emulsion to a negative by means of light rays
blue region of the spectrum, comprising, provid
in said other regions to form a positive image
ing a negative, providing a printing member hav
on said emulsion, developing and ñxing said im
ing an emulsion which is sensitive to the blue
age, and printing said positive image onto said
and green regions of the spectrum, exposing said
blue print by exposing the image to a blue light
emulsion by passing a green light through the
which is freely transmitted by said layer to pro
negative and the emulsion to expose the latter,
duce a positive image on said blue print.
allowing said light to then pass into a layer con
3. The process of forming a positive blue print 20 taining e, magenta alkoxy anthraquinone dye
on a materail having a coating sensitive only to
which will absorb the green light to prevent hala
the blue region of the spectrum, comprising, pro
tion of said emulsion but which will freely trans
viding a printing member having an orthochro
mit blue light, developing and ñxing the emulsion
matic emulsion, and a layer containing a dye
on said member, and then printing on said ma
capable of absorbing green light to protect the 25 terial by passing a, blue light through said emul
emulsoin against halation but permitting the free
sion and dye layer.
pass of blue rays, exposing said emulsion to a
negative by means of green light to form a pos
8. The process of forming a positive photo
graphic print on a material sensitive to only the
itive image in said emulsion, developing and ñxing
blue region of the spectrum, comprising, pro
said _positive image, and then printing said pos 30 viding a negative, providing a printing member
itive image onto said material by exposing said
having an emulsion which is sensitive both to the
image to a blue light to form a positive image
on said blue print material.
4. The process of forming a positive photo
graphic print on a material which is sensitive 35
only to the blue region of the spectrum, compris
blue and the green regions of the spectrum, pro
viding a yellow ñlter which will pass green and
red but which will absorb blue, exposing said
emulsion by directing a white light »onto said
filter so that only green and red light are trans
mitted to the emulsion to expose the latter, pro
ing, providing a printing member having an
emulsion which is sensitive to the blue and green
viding said member with a layer having incorpo
regions of the spectrum, and also having a layer
rated therein a permanent dye which will absorb
containing a dye sensitive to Iblue and red, ex 40 light of the green region after the passage there
posing said emulsion to a negative by means of
of through said emulsion to prevent the halation
a green light to form a positive ima-ge in said
thereof but which will freely transmit blue light,
emulsion, developing and ñxing said positive im
developing and ñxing the exposed emulsion, and
age, and then printing said positive image onto
said material by exposing said image to a blue
then printing on said material by passing a blue
light to form a positive image on said material.
5. The process of forming a positive photo
graphic print on a material sensitive to only the
9. The process of forming a positive photo
graphic print on a material sensitive to only the
blue region of the spectrum, comprising, provid
light through said emulsion and dye layer.
blue region of the spectrum, comprising, provid
ing a negative, providing a printing member hav
ing a negative, providing a printing member hav 50 ing an ortho-chromatic emulsion, providing a
ing an emulsion which is sensitive to the blue
yellow filter Which will pass green light but will
and green regions of the spectrum, exposing said
absorb blue, exposing said emulsion to green light
emulsion by passing a green light through the
by directing a white light onto said ñlter posi
negative and the emulsion to expose the latter,
tioned between the light and emulsion, providing
allowing said light to then pass into a layer con 55 said member with a layer having incorporated
taining a magenta dye which will absorb the
therein a, permanent dye transparent to blue but
green light to prevent halation of said emulsion
capable of absorbing in the green region of the
but which will freely transmit blue light, devel
spectrum so as to absorb the green light after
oping and nxing the emulsion on said member,
the passage thereof through said emulsion to
and then printing on said material by passing a 60 prevent halation thereof, developing and ñxing
blue light through said emulsion and dye layer.
the exposed emulsion, and then exposing the
6. The process of forming a positive photo
printing member to White light the greenportion
graphic print on a material sensitive to only the
of which will be absorbed by said dye but the
blue region of the spectrum, comprising, pro
blue portion of which will be freely transmitted
viding a negative, providing a printing member 65 >to expose said material.
having an emulsion which is sensitive to the blue
CYRIL J. STAUD.
and green regions of the spectrum, exposing said
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