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Патент USA US3020816

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Feb- 13, 1962
A. BROMS
3,020,797
PROJECTOR IMPROVEMENTS
Filed Nov. 9, 1956
AllanINBroms
VEN TOR.
BYC’WW
ATTQRNEY
United States Patent 0
3,020,797
Patented Feb. 13, 1962
2
1
ment, or it may be done to crop the print to a limited
3,020,797
portion of the full ?eld area projected.
In FIGURE 1 are shown two masking blades 52 and
53 extending intersectingly across the ?eld area with inner
PROJECTOR IMPROVEMENTS
Allan Broms, Beechhurst, N.Y.
(132-45 Maple Ave., Flushing, NY.)
edges at right angles respectively to the abutment mem
Filed Nov. 9, 1956, Ser. No. 621,326
4 Claims. (Cl. 88-24)
bers 15 and 16, and attached thereto for lateral adjustive
movement along said members.
On the masking blades 52 and 53 are provided gradu
This invention relates to the art of optical projection
ated scales 54 and 55, with the zero point of each scale
and photographic enlargement of ?lms, slides and the
at the inner edge of the abutment member along which
like through the lens of a projector to a ?at surface such
it slides. The graduations of each blade scale could be
as a screen or sensitized paper.
made equal to those of its parallel abutment member,
The present application is a continuation in part of
which are preferably equal respectively to the parallel
my prior application Serial No. 165,937, ?led June 3,
dimensions of the frame aperture and indicate the ratio
1950, now Patent No. 2,772,599, which is a continuation
in part of my prior application Serial No. ‘606,904, ?led 15 of copying or projection. However, to widen usefulness,
the blade scale graduations are preferably made equal to
July 25, 1945, now abandoned. Also related are my US.
some standard unit of measurement, such as the inch or
centimeter. Then the abutment member scales can be
Patent 2,741,945, issued April 17, 1956, and entitled
“Copying Camera Assembly,” and two applications of
used to measure the ?eld in terms of projection ratios,
even date herewith entitled “Copying Camera Improve
ments,” ?led November '9, 1956, now Patent No.
while at the same time the masking blade scales measure
that area or a portion thereof in terms of actual dimen~
sions as shown» at the intersection of the inner edges of
2,882,790, issued April 21, 1959, and “Scanning Camera
Assembly,” Serial No. 621,325, ?led November 5, 1956,
now abandoned. The present application relates to im¢
the blades.
For example, it is desired to project an enlargement of
provements rendering more e?’icient as a projector, the
inventions of my said prior applications.
, 25 a ?lm frame to a sheet of sensitized paper of given di
mensions. The two masking blades are ?rst set so that
To ?t either the dimensions or proportions of originals
their inner edges intersect at scale points corresponding
or enlargements, or for other purposes, it is often desired
to those given dimensions. When so set, those inner
to alter the dimensions of the projector frame aperture
blade edges also indicate on the abutment member scales
or the ?eld area by masking or like means. It is also
often advantageous to predetermine the projection ratio 30 the projection ratio required, so that the bracket 18 and
frame aperture 20 may be placed accordingly along re
precisely, o: the exact dimensions, position and limits of
the projected image as thus altered and at a given pro
spective setting scales. Everything is thus made ready
for the actual projection printing as planned.
jection ratio.
Or it is desired to crop, so that only a portion of
The primary object of this invention is to provide im
proved mechanical means whereby these ends may be 35 the original ?lm frame is printed, say an interior portion
of half the dimensions of the full frame aperture. The
accomplished simply, conveniently, positively and accu
masking blades are ?rst set to the size of the print de
rately. The apparatus is for purpose of illustration only,
sired, as measured on the blade scales. The bracket 18
and does not de?ne the limits of this invention.
and frame aperture 20 are then adjusted to a projection
' FIGURE 1 is a perspective view of apparatus embody
4.0 ratio twice that indicated by the blades on the abutment
ing part of the present invention.
member scales (twice being the inverse of the half di
mensions used). The ?lm itself is then moved relative to
the frame aperture to ?t the desired portion of the frame
In my Patent 2,741,945 and application Serial No.
165,937, I secure precise ?xation of two edges and one
corner of the ?eld area projection through the lens of
into the ?eld area as thus circumscribed and reduced.
the limiting frame aperture of a camera or projector, at
Two edges of the frame aperture are then projected
through the lens as the two ?xated edges of the cropped
all relative conjugate focal distances of the aperture and
?eld planes, and therefore at all ratios of copying or pro
jection. Furthermore I do this by merely two straight‘
line adjustive movements, namely: relative movement of
the frame aperture coaxially of the lens; and relative
‘ ?eld area, while the inner blades edges delimit the other
two edges of the cropped ?eld area.
The above examples illustrate but two of the many
ways in which the combination of ?eld ratio scales and
movement of the lens and/or ?eld area’ parallel to a 50
straight line drawn from the principal focal point of the I _ dimensional masking blade scales facilitate solutions of
‘ practical problems of enlarging dimensions and propor
lens on the ?eld side thereof to a corner of the projected
?eld image of the frame aperture, when the planes of the
apertureyand ?eld are in conjugate focus.
I v
To facilitate comparison, the reference designations of
said patent and co-pending application are similarly used
in this application. More directly pertinent to the imj
tions.
Among the advantages resulting from my invention
are the following:
~
By reason of the precise ?xation of two adjacent edges
of the ?eld area, the viewing screen or sensitized enlarge
ment paper can be instantly and positively placed in cor
provements of this application are the following refer
rect position against two ?xed guide abutments.
ence' designations: the ‘lens' 11; the frame aperture 20
and its conjugate projection through the lens as the ?eld 60 Also by reason of such precise ?xation of said edges,
the zero of each of the several ?eld scales is likewise
area 21; the support beam 17 and its scale 22; the sliding
kept ?xated, so that correct scale readings are always
bracket. 18; and the abutment members and their scales
indicated at'all projection ratios.
15
and
16.
‘
‘
I
'
’
'
'
In FIGURE ‘1, on that side of the frame aperture 20
‘
The dimensions of a, given screen, sensitized paper
and of the ?lmor slide opposite the lens 11, is provided 65 sheet or desired ?eld area can be read instantly on the
suitable means'51'for illuminating said aperture, ?lm _, masking blade scales, and delimited by placing of the
masking blades accordingly.
7
or slide for the purpose of bright projection to the ?eld
The projection ratio required to cover any given size
of screen, sensitized paper sheet or desired ?eld area can
p In the practice of photographic enlargement, itis often
desired to limit the area being enlarged or printed, gen 70‘ be read instantly on the abutment member scales.
The projector can accordingly be then placed instantly
erally by masking. Such masking may be done merely
to provide white borders around a darker print enlarge ‘ and positively in proper position on the support beam and
lane.
"
'
‘
-
~
3,020,797
adjusted instantly and positively to sharp conjugate focus‘.
Rectangular masking for any purpose and in any man
ner can be done easily, positively and accurately by com
bined use of the abutment members 15 and 16, and the
masking blades 52 ‘and 53, and their several scales.
Tl e foregoing description sets forth my invention in its
preferred practical form, but the invention is to be under~
stood as fully commensurate with the appended claims.
Having thus fully described the invention, what I claim
as new and desire to secure by Letters Patent is:
l. in a projection optical system having a lens, a frame
member to support a transparency with a limiting aper
ture at one side of said lens, and a ?eld locating member
at the other side of said lens, with means for guiding the
abutment member to which said blade is attached, where
by the positions and scales of the masking blades indicate
the size of the ?eld image and by their positions on the
abutment scales indicate the proper ratio of enlargement
and the proper settings 'of at least one of said lens and
?eld member relative to the scale on the straight support
ing guide and of the frame member in conjugate focus
with the ?eld area.
3. In a projection optical system having a lens, a frame
10 member to support a transparency with a limiting aper
ture at one side of said lens, and a ?eld locating member
at the other side of said lens, with means for guiding
the frame member for focusing movement, and with said
lens movable with respect to said ?eld member, and a
frame member for focusing movement, and with said 15 straight supporting guide for directing movement of said
?eld locating member and lens relatively movable with
lens parallel to a straight line drawn from the principal
respect to one another, and a straight supporting guide for
directing movement of at least one of said lens and ?eld
member parallel to a straight line drawn from the prin
cipal focal point of the lens on the ?eld side thereof to
a corner of the ?eld image of the aperture as projected
focal point of the lens on the ?eld side thereof to a
corner of the ?eld image of the aperture ‘as projected
through the lens when the planes of said aperture and
?eld are in conjugate focus, combined with elongated
abutment members on the ?eld locating member ar
through the lens when the planes of said aperture and
ranged parallel to the edges of the frame aperture and
?eld are in conjugate focus, combined with elongated
having thereon scales the zeros of which are at said corner
abutment members on the ?eld locating member arranged
of the ?eld image and the unit divisions of which are
parallel to the edges of the frame aperture and having 25 respectively equal to the parallel dimensions of the frame
thereon scales the zeros of which are at said corner of the
aperture and wherein the straight supporting guide is pro
?eld image and the unit divisions of which are respec
vided with a lens setting scale correlated with the scales
of the abutment members: masking blades attached to
tively equal to the parallel dimensions of the frame aper
ture and ‘wherein the straight supporting guide is provided
slide along each of said abutment members, each masking
with a scale for setting at least one of said lens and ?eld 30 blade extending across the ?eld area with its inner edge
normal to the inner edge of the abutment member to
member and correlated with the scales of the abutment
which it is attached, and each of said masking blades
being provided at its inner edge with a scale of dimen
sional units the zero of said scale being at the inner
across the ?eld area with its inner edge normal to the
inner edge of the abutment member to which it is at 35 edge of the abutment member to which said blade is
members: masking blades attached to slide along each of
said abutment members, each masking blade extending
tached, and each of said masking blades being provided
attached, whereby the positions and scales of the masking
at its inner edge with a scale of dimensional units the zero
of said scale being at the inner edge of the abutment
positions on the abutment scales indicate the proper ratio
blades indicate the size of the ?eld image and by their
of enlargement and the proper settings of the lens rela
member to which said blade is attached, whereby the
positions and scales of the masking blades indicate the 40 tive to the scale on the straight supporting guide and of
the frame member in conjugate focus with the ?eld area.
size of the ?eld image and by their positions on the abut
ment scales indicate the proper ratio of enlargement and
the proper settings ‘of at least one of said lens and ?eld
4. In a projection optical system having a lens, a
frame member to support an original being projected with
member relative to the scale on the straight supporting
‘a limiting aperture at one side of said lens, and a ?eld
guide and of the frame member in conjugate focus with 45 locating member at the other side of said lens, with means
the ?eld area.
for guiding the frame member for focusing movement,
2. In a projection optical system having a lens, a frame
and with said lens movable with ‘respect to said ?eld
member to support an original being projected with a
member, and ‘a straight supporting guide for directing
limiting aperture of one side of said lens, and a ?eld
movement of said lens parallel to a straight line drawn
locating member at the other side of said lens, with means 50 from the principal focal point of the lens on the ?eld
for guiding the frame member for focusing movement,
side thereof to a corner of the ?eld image of the aperture
and with said ?eld locating member ‘and lens relatively
as projected through the lens when the planes of said
movable with respect to one another, and a straight sup
aperture
and ?eld are in conjugate focus, combine-d with
porting guide for directing movement of at least one of
elongated
abutment members on the ?eld locating mem
55
said‘ lens and ?eld member parallel to a straight line
ber arranged parallel to the edges of the frame aperture
drawn from the principal focal point of the lens on the
and having thereon scales the zeros of which are at said
?eld side thereof to a corner of the ?eld image of the
corner of the ?eld image and the unit divisions of which
aperture as projected through the lens when the planes of
said aperture and ?eld are in conjugate focus, combined 60 are respectively equal to the parallel dimensions of the
frame aperture ‘and wherein the straight supporting guide
with elongated abutment members on the ?eld locating
is provided with a lens setting scale correlated with the
member arranged parallel to the edges of the frame aper
scales of the abutment members, masking blades at
ture and having thereon scales the zeros of which are at
tached to slide along each of said abutment members, each
said corner of the ?eld image and the unit divisions of
which are respectively equal to the parallel dimensions 65 masking blade extending across the ?eld area with its
inner edge normal to the inner edge of the abutment mem
of the frame aperture and wherein the straight supporting
ber to which it is attached, and each of said masking
guide is provided with a scale for setting at least one of
blades being provided at its inner edge with a scale of
said lens and ?eld member and correlated with the scales
dimensional units the zero of said scale being at the
of the abutment members: masking blades attached to
slide along each of said abutment members, each masking 70 inner edge’ of the abutment member to which said blade
blade extending across the ?eld ‘area with its inner eQe
is attached, whereby the positions and scales of the
normal to the inner edge of the abutment member to
masking blades indicate the size of the ?eld image and
which it is attached, and each of said masking blades be
by their positions on the abutment scales indicate the
ing provided at its inner edge with a scale of dimensional
proper ratio of enlargement ‘and the proper settings of
units the zero of said scale being at the inner edge of the 75 the lens relative to the scale on the straight supporting
3,020,797
5
6
guide ‘and of the frame member in conjugate focus with
2,188,622
Cantor _______________ __ Ian. 30, 1940
the ?eld area.
2,199,304
Dewey _______________ __ Apr. 30, 1940
2,303,920
Drucker ______________ __ Dec. 1, 1942
2,315,066
Lund ________________ __ Mar. 30, 1943
2,342,525
2,741,945
Berry ________________ _- Feb. 22, 1944
Broms _______________ __ Apr. 17, 1956
492,059
Italy ________________ __ Mar. 15, 1954
References Cited in the ?le of this patent
5
UNITED STATES PATENTS
1,535,041
1,579,741
Ruhm-ann ____________ __ Apr. 21, 1925
Verburg ______________ __ Apr. 6, 1926
1,994,091
Shwartz ______________ __ Man 12, 1935
FOREIGN PATENTS
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