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Патент USA US2130561

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Sept. 20, 1938.
v, ‘E, PRATT
2,130,561
PROJECTION APPARATUS
Filed March 11, 1936
2 Sheets-Sheet l
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I.
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7
INVENTOR
VERNEURE-WJT
Sept. 20, 1938.
v. E. PRATT
2,130,561
PROJECTION APPARATUS
Filed March 11, 1936
2 Sheets-Sheet 2
IINVENTOR
VERNE v11 E. PRATT
BY
' ATTORNEY
‘Patented Sept. 20, 1938
2,130,561
UNITED 'STATES PATENT OFFICE
PROJECTION APPARATUS
Verneur E. Pratt, Stamford, Conn., assignor, by
mesne assignments, to Plant Liquidation Cor
poration, a corporation of New Jersey
Application March 11, 1936, Serial No. 68,206
9 Claims. (Cl. 88-24)
This invention relates to projection apparatus. arms 31 and 38 of a bracket 39 fastened to the
An object of the invention is to- provide a com
housing l2 in line with the lamp l3. The lens
bined lens and ?lm guide for use in projectors. 32 extends into the housing I2, and a light and
,Another object is to provide a combined lens heat shield 40 may be disposed between the lens
5 and ?lm guide which is cylindrical in shape.
and lamp as shown in Fig. 1, the shield 40 hav- 5
A further object is to provide a combined cy
lindrical lens and ?lm guide which is 'rotatably
mounted and adapted to be freely rotated by
the ?lm in the latter’s contact with the lens
10. surface whereby slippage between the ?lm and
- guiding means is eliminated.
Other objects and advantages of the invention
'
Figure 1 is a side view partly in section show
ing the device incorporated in a projector;
Figure 2 is a front elevation of the device;
Figure 3 is a perspective view illustrating the
engagement of the. ?lm with the rotary lens and
guide;
'
Figure 4 is a, diagrammatic view of the device
operating as a condensing lens:
Figure 5 is a diagrammatic view showing the
IO 5 operation of the retracting bail.
Referring to Figure 1, the numeral l0 gener
ally ‘denotes a reading or reference projector of
the type described and claimed in co-pending ap
plication Serial No. 68,204, ?led March 11, 1936,
30 and having a casing H in which is secured a
lamp housing l2.
omitted.
In this arrangement, the lens 32 acts
as a condensing lens to concentrate the light
will become apparent during the course of the
following description in connection with the ac‘
15 companying drawings, in which
ing a slot 4| through which the light is directed
by a suitable concentrating re?ector 42. It will
be understood that the arrangement shown in
Fig. 4 may be used, in which the shield 40 is
A lamp I3 is held in a socket
44 secured in a sleeve 45 formed on or fastened
to a plate 16. The plate I6 is slidably mounted
in rails 11 and 98 secured to the front and rear
35 walls of the housing l2, and is adapted to be
moved therein by means of a pinion 19 mesh
ing with a rack 20 on the underside of the plate.
The pinion 20 is secured on the end of a shaft
2| journalled at 22 in the housing l2. A sec
40 ond pinion 23 on the front end of the shaft 2!
meshes with a second rack 24 secured to a yoke
member 25 slidably mounted in transverse rails
26 and 21 secured to the front wall of the casing
II. The yoke 25 carries a third rack 28 mesh
45 ing with a pinion 29 on a shaft 30 journalled in
the front of the casing II and having an ex
ierior knob 3|.‘ By turning the knob 3|, the
yoke 25 is shifted transversely in the casing l0,
causing the second rack 24 to revolve the sec
50 end pinion 23, shaft 2! and pinion 20, the pin
ion 20 moving the lamp assembly as noted.
A cylindrical lens 32, having end caps 33 and
34, as shown in Figs. 2 and 3, is freely rotatable
on pivots 35 and 36 centrally engaging the end
55 caps, the pivots 35 and 36 being secured in the
from the lamp l3 and a reflector 43 of larger
radius of curvature than that shown in Fig. 1,
is employed.
A ?lm magazine 44 containing upper and lower 15
?lm reels 45 and 46 is disposed in the casing II >
adjacent the lamp housing l2 and partly encir
cling the cylindrical lens 32 as shown in Fig. 1.
A ?lm 41, wound on the reels 45 and 46, runs
over guide rollers 48 and 49 between which it en
gages and follows a segment of the cylindrical
surface of the lens 32.
_
This magazine is more fully described in the
co-pending application Serial Number 68,205,
?led concurrently herewith. The magazine cas 25
ing has a semi-circular aperture on one side, to
receive a portion of the cylindrical lens 32 which
consequently engages the ?lm 41 within the mag
azine casing, and a pocket 56 in the opposite side
wall. The wall of this pocket has a slot 58 there 30
in to permit light to pass through the magazine
and through the ?lm.
The reels 45 and 46 are adapted to be selec
tively driven through their hubs by any suit
able means such as manual cranks (not shown)
in the rear side of the machine. Preferably
either reel from which the ?lm is being unwound
is revolved through the tension of the ?lm itself
as the latter is wound on the other reel, the wind
ing reel revolving with sufficient friction to tend
to retard its rotation, by which means the ?lm 41
may be kept taut at all times and, therefore,
positively engaged with the lens 32.
A bail 50, Figures 1, 2 and 5, is journalled on
the outer ends of pivots 35 and 36 so as to span
the length of the lens 32 and its end caps 33 and
34. The outer end of the bail 50 is formed as
an angular shoe 5| sloping toward the axis of
the lens 32. The bail 50 has thereon a lever
52, shown in Figure 5. In normal position, the 50
bail is swung upward as shown in Figures 1 and
2, to clear the ?lm 41 and allow the latter to
embrace the lens 32 without interference.
When it is desired to remove the magazine 44
and ?lm 41 from the projector, the lever 52 is 55
2
2,180,561
thrown downward as shown in Figure 5, the ball
50 engaging the ?lm 41 and drawing it clear of
lucent screen 61 secured in a hood 6| on the
projector, the ?lm riding the ball 50 and thus
clearing the lens assembly.
When the magazine is replaced in the pro
top of the casing II.
A shaft 68, journalled in the yoke 25 and carry
ing a worm 10 engaging threads 1| in the top of
the lens barrel 54, extends outward through a
lateral slot 12 in the front of the casing II and
has an exterior knob 13. ‘By rotating the knob
jector, the bail being in the position shown in
Figure 5, the ?lm 41 engages the sloping shoe 5|
10 which guides it into its position, shown in the
screen 61 may be brought into proper focus. The
' the lens 32 and end caps 33 and 34.
The maga
zine may now be withdrawn laterally from the
above ?gure. The bail 50 is then swung up
ward to clear the ?lm, after which the ?rst
rotation of either reel draws the ?lm taut around
the lens 32, as shown in Figure 1.
From the foregoing it is evident that the bail
15
50 with its sloping shoe 5| makes it unnecessary
to touch the ?lm with the ?ngers in removing
or replacing the magazine in the projector, and
that the projector itself contains no special guide
rollers, or ?lm troughs, the rotary lens 32 itself
acting as a rolling guide in cooperation with the
rollers 48 and 49 in the self-contained magazine
44 to locate the ?lm accurately for projection.
A sleeve 53, Figure 1, formed on or secured
25 to the yoke 25, holds a lens barrel 54 in which
is disposed a small barrel 55 containing the usual
projection lens combination, the small barrel 55
and its contained parts being hereinafter re
ferred to as the projection lens.
The sleeve 53 and barrel 54 extend rearwardly
30
into a pocket 56 in the magazine 44. The wall
51 of the pocket 56 has a transverse slot 58 in
line with the projection lens 55, the middle of
the lens 32 and the ?lament 59 of the lamp l3.
In operation, light from the lamp i3 is con
35
centrated on a narrow transverse portion 60 of
the ?lm 41 as indicated in dotted and dashed
lines in Figure 3. The concentration of light
may be accomplished either as shown in Fig
40 ure 1, in which the light from the ?lament 59
and concentrating re?ector 42 is received by the
lens 32 on its emergence from the slot 4| and
directed through the lens in a substantially ?at
beam to the ?lm; or as shown in Figure 4, where
45
in the lens 32 itself condenses the light and
concentrates it on the ?lm portion 60.
The ?lm 41, as normally used in the reference
or reading projector shown, carries microscopic
images of reading or reference material arranged
in parallel columns disposed side by side across
50 the width of the ?lm as indicated at 6|, Figure 3,
thus allowing a large amount of data such as
that contained in a telephone directory to be
concentrated in small space. When it is desired
to observe a particular line of a particular
column the projector lens system is shifted lat
erally bymeans of the knob 3| as previously de
scribed until the lens 54 comes into registry with
the desired column such as Bla, Figure 3, and
60 the ?lm fed upward or downward by rotating its
reels until the required line is brought into
the illuminated area 60. In'the projector as
shown in Figure 1, the light source is shifted in
synchronism with the projection lens 55 as
previously described, the shield 40 with slot 4I_
restricting the illumination at 60 to the par
ticular column in registry with the projection
lens, while in the lighting arrangementshown
in Figure 4, the entire area 60 is illuminated at
70 all times. In either case, the lens 55 projects
an image,of the registered line against an angu
lar mirror 62 in the front of the sleeve 53, from
which mirror the image is re?ected through an
aperture 63 in the bottom of 53 and via succes
75 sive angular mirrors G4, 65 and ‘66 to a trans
13 the lens barrel 54 may be moved inward or
outward, thus providing an adjustment for the
projection lens by which the image on the 10
lateral slot 12 provides clearance for the shaft 69
when the yoke 25 is traversed.
Due to the small height of the illuminated area
60 and the large diameter of the lens 32, the 15
total curvature within the area projected is so
small that projection takes place substantially
from a plane, ensuring a sharp projection of
the entire image. The bending of the ?lm
around the circumference of the lens assures 20
that no lateral buckling can occur.
The free rotation of the lens 32 by the ?lm 41
in rolling contact avoids abrasion and wear of
the ?lm surface such as arises in projectors
wherein the ?lm travels over stationary guides. 25
The rotary guide being a lens throughout the
entire width of the ?lm, the entire ?lm area is
available for projection in projectors such as
the type illustrated, wherein no sprockets are
necessary.
30
While the invention has been described in pre
ferred form, it is not limited to the precise struc
tures illustrated, as various modi?cations may be
made without departing from the scope of the
35
What is claimed is:
1. In a projector including a movable ?lm and
a housing containing a light source, in combi
nation, trunnions on said housing, said housing
having therein an aperture, a, cylindrical lens 40
rotatably mounted on said trunnions and extend
ing through said aperture into said housing, said
lens engaging one side of said ?lm to guide the
same and being adapted to direct light from
said source to said ?lm, and a projection lens 45
in line with said light source and said cylindrical
lens and said ?lm.
2. In a projector including a movable ?lm and
a housing containing a light source, in combi
nation, trunnions on said housing, said housing 50
having formed therein an aperture, a cylindrical
lens rotatably mounted on said trunnions and
appended claims.
extending through said aperture in said housing,
said lens engaging one side of said ?lm to guide
the same and being adapted to direct light from 55
said source to said ?lm, a projection lens in line
with said light source and‘ said cylindrical lens
and said ?lm, and a bail swingable on said trun
nions to disengage said ?lm from said cylindrical
lens.
3. In a projector, a light source, an objective
lens, a rotatable cylindrical condensing lens po
sitioned to receive light from said source and to
deliver light to said projection lens, a ?lm maga
zine having aligned apertures therethrough one 65
of which partially embraces vsaid cylindrical lens
when said magazine is normally positioned in
said projector, a pair of reels in said magazine,
a ?lm on said reels spanning said last aperture
and adapted to frictionally engage said cylindri 70
cal condensing lens when said magazine is nor
mally positioned in said projector, and means for
rotating at least one of said reels to move the ?lm.
4. In a projector, a light source, an objective
lens, a rotatable cylindrical condensing lens po
75
3
' 2,130,561
sitioned to receive light from said source and to
deliver light to said projection lens, a ?lm maga
xzine having aligned apertures therethrough one
of which partially embraces said cylindrical lens
when said magazine is normally positioned in
said projector, a pair of reels in said magazine, a,
?lm on said reels spanning said last aperture
and adapted to frictionally engage said cylin
drical condensing lens when said magazine is nor
10 mally positioned in said projector, and means
for rotating one of said reels to move said ?lm
in one direction and the other of said reels to
move the ?lm in the opposite direction.
5. In a projector, a lamp house having an
15 aperture formed therein, a source of light in said
lamp house, an objective lens, a rotatable cylin
drical lens positioned between said source and
said objective lens, said aperture partially em
bracing one side of said cylindrical lens, a ?lm
magazine having aligned apertures therethrough
one of which partially embraces the other side of
said cylindrical lens when said magazine is nor
mally positioned in said projector, a pair of reels
in said magazine, a ?lm on said reels spanning
said last aperture and adapted to frictionally en
gage said cylindrical condensing lens when said
magazine is normally positioned in said projece
tor, and means for rotating one of said reels to
move the ?lm in one direction and the other
0! said reels to move the/?lm in the opposite
direction.
’
6. In a‘ projector, a lamp house having an
aperture formed therein, a source of light in
said lamp house, an objective lens, a rotatable
cylindrical lens positioned between said source
and said objective lens, said aperture partially
embracing one side of said cylindrical lens, a
?lm magazine having aligned apertures there
through one of which partially embraces the
40 other side of said cylindricalv lens when said
magazine is normally positioned in said projec
tor, a pair of reels in said magazine, a ?lm on
said reels spanning said last aperture and adapt
ed to irictionally engage said cylindrical lens
45
when said magazine is normally positioned in
said projector, means associated with said cylin
drical condensing lens and concentrically mov
able thereabout for retracting said ?lm from said
cylindrical lens when said magazine is to be re
moved from the projector, and means for rotat
ing one of said reels to move the ?lm in one
direction and the other of said reels to move the 1
?lm in the opposite direction.
1
7. A projector according to claim 6, wherein
said retracting means comprises a bail extending
over the length of said cylindrical lens and hav_-.
ing at one end thereof a shoe inclined toward
the axial line of the cylindrical lens and adapted
to engage and hold the portion of the ?lm span
ning said last aperture clear of said cylindrical 15
lens while said ?lm magazine is being positioned
in the projector and adapted to be moved out
of engagement with the ?lm when the magazine
is normally positioned in the projector, thereby
guiding the ?lm into circumferential registry 20
withvsaid cylindrical lens.
_
8. A projector according to claim 6, in which
a shield is positioned in said lamp house and
provided with an aperture smaller than said ?rst
aperture in said lamp house and adapted to de 25
?ne the size of a beam oilight passing through
said cylindrical lens.
9. In a projection device, a cylindrical con
densing lens, a light source spaced apart from
said lens and outside the periphery thereof, a 30
?lm magazine having aligned apertures there
through, one of which partially embraces said
cylindrical condensing lens,‘ a pair of reels in
said magazine, a ?lm supported on said reels
spanning said last aperture and engaging an arc 35
of the circumference of said lens whereby light
from said source may pass through said ?lm and
the body of said lens and emerge therefrom at
a point circumierentially opposite to its point
oi’ entry, and a projection lens spaced apart from 40
said cylindrical lens and‘ outside the periphery
thereof and located in the emergent beam there
from.
'
VERNEUR- E. PRATT.
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