Патент USA US2130561код для вставки
Sept. 20, 1938. v, ‘E, PRATT 2,130,561 PROJECTION APPARATUS Filed March 11, 1936 2 Sheets-Sheet l lEtl I. .1; r 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.