Патент USA US2135996код для вставки
Nov. s, 1938. » D- L- WOOD 2,135,996 VENTILATING OF LAMP HOUSES Filed Aug. 11, 1936 DonakiLWooeL, INVENTOR: BY 4W.//%W M76 ' ATTORNEYS. Patented Nov. 8, 1938 2,135,996 UNITED STATES PATENT OFFICE 2,135,996 ’ VENTILATING OF LAMP HOUSES Donald L. Wood, Rochester, N. Y., assignor, by mesne assignments, to Eastman Kodak Com pany, Jersey City, N. J., a corporation of New Jersey , Application August 11, 1936,’ Serial No. 95,379 4 Claims. (01. 88-24) This invention relates to motion picture pro jectoraand more particularly to the cooling and ventilating of the lamphouse thereof. 5 20 is looped at ‘2i and 22 on'opposite sides of the . ?lm gate, and is fed to the'loop 2i by means of a continually rotating sprocket 28, which draws One object of the invention is to provide a new the ?lm 20 from a supply reel 25, ‘rotatably mounted on the spindle 26 carried by the up- 5 and improved lamphouse arrangement in which the heat radiated by the lamp ?lament is readily and effectively removed from the lamphouse. wardly projecting arm 21. - fere with the free flow of cooling air there-‘ through. 'A further object is to provide a lamp house of this class in which the hottest portion of the lamp is in the section of highest air ve locity so as to be effectively cooled thereby. Still another object is to provide such a lamphouse in in which the streams of cooling air ?ow in the same direction as the natural air movement, thus effectively cooling the lamphous and ventilating A still further object is to provide such a lamphouse arrangement which‘ is simple in construction, relatively inexpensive to manu facture, and highly effective when used. To these and other ends the invention resides 25 in certain improvements and combinations of parts, as will be hereafter more fully described, the novel features to be pointed out in the claims at the end of the speci?cation. In the drawing: 30 ' Figure 1 is a side elevation of a motion pic-_ ture projector equipped with a lamphouse con _ 23, moves the ?lm 20 from the loop 22 to a takeup reel 35 rotatably-mounted on a'spindle 36 car 10 is exterior of the lamphouse so as not to inter 20 the same. ‘ A second sprocket 30, similar to the sprocket Another object is to provide such a lamphouse in which the lamp holding or supporting member ried by the arm 31. The takelup reel is operated 10 by means of a power driven belt 38 which is con nected to a motor, not shown, positioned within ‘a housing i2, as is well known. The above described mechanism, with the ex ception of the lamphouse it, may be of the usual 15 or any construction well-known to those in the art, and does not constitute a part of the pres ent invention. _ ; Referring now to Figures 2 and 3"wherein is _ shown a lamphouse l5 constructed in accordance 20 with the preferred embodiment of the invention. This lamphouse comprises, in general, a sub stantially vertical tubular member of fluid con duit having an enlarged lower end 40 which forms a fan casing or scroll, an intermediate con- 25 verging section 42, and a ?ared out discharge opening 43, all will be hereinafter more fully de scribed: It is apparent from an inspection of Figure 3 that the upper portion of the lamp house constitutes a substantial Venturi nozzle of 30 which ‘the converging section 42 is the throat thereof. throat 42 is formed with laterally extend Figure 2 is a side elevation of the preferred ingThe tubular sleeves l5 and 46 which are in optical 35 type of lamphouse. ’ alignment with the front lens barrel 48 of the as Figure 3 is a vertical sectional view of the projector; and in which are respectively mounted, lamphouse taken substantially of the line 3—3 in the manner shown, a re?ector 50, and a rear of Figure 2. lens barrel ii in which are suitably secured the Similar reference numerals throughout the lenses 52. The re?ector I0 and the lenses 52 40 several views indicate the same parts. » provide means for directing light rays from a 40 A lamphouse constructed in accordance with source of illumination, such as the lamp 55, thepresent invention is herein illustrated as ap through an image on a ?lm 20, and then through plied to a motion picture projector having a base suitable lenses in the front barrel 48 to an image Ii which supports a motor housing l2. the ?lm ' receiving screen. 7 ' 45 operating mechanism which is enclosed in a When a high intensity ‘source of illumination suitable housing It positioned above the motor such, for example, as the electric lamp 5!, is 45 housing i2, and a chamber it in which the'lamp used, a large amount of heat is radiated into the house, generally indicated by the numeral I! and lamphouse. In order to protect the various parts hereinafter more fully described, is positioned. of the projector, it is highly essential that this , 50 The operating mechanism may be of the’usual heat be readily and effectively carried away or 50 and well-known construction driven by power , dissipated as fast as radiated, for obvious reasons. through a motor positioned in the housing i2, Such heat is usually carried away by means of a and consisting of a pull-down claw, not shown,’ stream of cooling air which flows through the for intermittently moving a ?lm 20 past a ?lm 66 gate through which light may pass. The film lamphouse and over the lamp itself to cool the latter'and to remove the heat radiated thereby. 55 structed in accordance with the preferred em bodiment of the invention. , 2 2,185,996 It is well known, however, that the most effec tive air cooling is secured when the coolest air is directed into intimate contact with the hottest portion of the object'tc be cooled; and when the free passage of the air over the object is not ob structed nor de?ected by various objects such, for example, as the lamp supporting socket or base. ' In prior lamp lamphouse constructions, the 10 cooling air ?rst contacts the base of the lamp, and, after being somewhat raised in temperature, it ?nally reaches the hot ?lament area of the lamp. Furthermore, the lamp socket is usually positioned directly in the path of the ?owing air, and thus de?ects the latter so as to cause eddy current, thus not only materially reducing the cooling effect of the air, but also decreasing the fan efficiency. The present invention overcomes these objec 20 tionable features by placing the lamp supporting socket outside of the lamphouse proper, and by inverting the lamp within the lamphouse so that the lamp extends directly into the path of the cooling air, thus bringing the hot ?lament area 25 of the lamp into the direct path of the coldest air, as will be apparent from inspection of Fig ures 2 and 3. In the speci?c embodiment of the invention, the lamp 55 extends downwardly through the ?ared-out discharge opening 43, and has the axis thereof in substantial alignment with the vertical axis of the Venturi nozzle. The ?lament area 55 of the lamp is arranged within the converging section on throat 42 of the lamphouse, and in 35 alignment with the optical axis of the re?ector 50 and the lenses 52. The lamp is connected to and supported by a suitable receptacle or socket 60, which is arranged above and exteriorally of and ventilate the latter. -By reason of this stream-line ?ow, not only is more effective cool ing secured, but the fan efficiency is also thereby increased. , As pointed out above, the upper portion of the lamphouse is in the form of a Venturi nozzle, sec tion 42 of which constitutes a Venturi throat. Such a throat provides a means‘ for converting a portion of the static head of the air leaving the fan into velocity head so that the velocity of the air streams passing through the throat 42 is there by greatly increased. As the ?lament area 55 of the lamp is substantially concentrically posi tioned within the throat 42, it is obvious that the high velocity air streams will readily and e?ec tively carry away the heat radiated by the lamp ?lament. The static head of the air is substan tially restored by reason of the ?ared out dis charge opening 43, as is well known by those fa 20 miliar with the art. The entire lamphouse l5 may be suitably se- - cured in vertical position within the chamber l4, in any well-known manner. To permit replace ment of the lamp 55, as well as the cleaning of 25 the optical members 50 and 52, a portion of the lamphouse i5 is preferably secured to and mov able with the door 64. In the present embodi ment, the lamphouse is split along the line 50 to form a narrow side portion ll, ‘see Figure 2, which is rigidly secured to and movable as a unit with the door 64. Rivets or other securing means 85 are provided for mounting the portion 8| on the door 54, as clearly illustrated in Figs. 1 and 2. It is also apparent from an inspection of Fig ure 2, that when the door 64 is swung open, the lamp 55 as well as the portion ll are moved into house, as will be apparent from an inspection of the position shown by the dotted line, thus fa cilitating the replacing of the lamp 55 and/or the 40 cleaning of the optical members 50 and 52. Fig. 3. In the preferred embodiment, the socket 80 is full line, the portion ll abuts the lamphouse l5 the lamp house and out of the direct path of the 40 streams of cooling air ?owing through the lamp preferably mounted on and supported by an L 45 shaped bracket 6|, the shorter leg 52 of which is ‘secured by rivets or other fastening means 63 to the door 64'0f the chamber l4. The door 64 is hingedly connected along the line 65 to the lamp house, so that the door may be swung to open 60 line relation through the entire lamphouse to cool position to permit removal and replacement of the lamp 55, as well as cleaning of the optical members 50 and 52, all as will hereinafter be more fully described. The socket 55 is connected to a suitable source of electrical current, not shown, 55 by which the lamp ?lament 56 may be illuminated to project the image on the ?lm 20, as is well known to those of the art. A continuous supply of cooling air is provided by a fan 58 rotatably mounted on a shaft 59 in 60 the fan casing 40. This fan forces streams of cooling air upwardly through the lamphouse and over the lamp 55 to effectively cool the latter, as well as. the adjacent optical members. This fan is operatively connected to and driven by a motor within the housing i2. Air is admitted to the fan through grilles 10 at the bottom of the cham ber l4 as clearly illustrated in Figure 1. When, however, the door is closed, as shown in along the line III to forman air tight connection therewith. A small knob 85 permits easy open 45 ing of the door. , ~ It is apparent from the above description that by inverting the lamp 55, not only are obstruc tions entirely eliminated within the lamphouse so that the air can pass therethrough in de?nite stream-lines; but also the coolest air ?rst engages the hottest portion of the lamp, thus insuring the maximum cooling effect. Furthermore, the movement of the cooling air is in the direction of the natural air movement through the lamphouse ‘thus assisting in the proper ventilation of the latter. ‘While one embodiment of the invention has been disclosed, this is by way of illustration only, as it is understood that the inventive idea may be carried out in a number of ways. This appli cation is, therefore, not to be limited to the pre cise details disclosed, but is‘ intended to cover all modi?cations and variations thereof falling with in the spirit of the invention and the scope of the appended claims. ' I claim: ’ Referring now to Figure 3, it is apparent that ‘when the lamp is inverted so as to extend down 70 wardly into the lamphouse, the cooling air ?rst 1. In a motion picture projector, the combina tion with a chamber, of a lamphouse positioned within said chamber and comprising a ?uid con duit, means for forcing strea ‘of cooling ?uid is also apparent that by placing the light sup porting socket 60 outside of the lamphouse, no ob structions are present in the path of the air, so 75 that the latter may travel in substantially stream upwardly through said cond?, a door opera engages the hot ?lament area 55 of the lamp. It 70' tively connected to said chamber, a lamp sup ported on said chamber and inverted within said conduit and in the path of said streams so as to 75 i 3 2,185,996 be cooled thereby, and a part or said conduit ad jacent said lamp secured to' and movable as ‘a unit with said door to facilitate replacement or said lamp. 2. In a motion picture projector, the combina~ ‘ tion with a chamber, of a lamphouse positioned connected to said chamber, an inverted lamp in cluding a ?lament area mounted on said door ex teriorly of said conduit and extending downward ly into said nozzle and with the ?lament area thereof in said throat whereby said area is cooled within said chamber and comprising a ?uid con by said high velocity streams, and a part of said conduit adjacent said throat secured to and duit, means foryforcing streams of cooling ?uid movable with said door to facilitate the replace upwardly through said conduit, a door hingedly ment of said lamp. 10 connected to said chamber, a lamp inverted with in said conduit and in the path of said streams so as to be cooled thereby, lamp supporting means mounted on said door, and a portion 01' said conduit adjacent said supporting means 15 mounted on and movable with said door to facil ' \ 4. In a motion picture projector, the combina 10 tion with a chamber, of a lamphouse within said chamber and comprising a stream-line ?uid pas sageway, a lamp within said lamphouse and po sitioned in said passageway and including a ?la ment which heats a portion 'of said lamp to a 15 itate replacement of said lamp. 3. In a motion picture projector, the combina high temperature, a restricted area in said pas sageway surrounding the ?lament section of said tion with a chamber, of a lamphouse positioned within said chamber and comprising a ?uid con lamp, a fan rotatably mounted in said lamphouse to force streams of air through said passageway, a door operatively connected to said chamber, 20 20 duit, a converging portion between the ends of said conduit to form a Venturi nozzle having a throat, a fan for forcing streams of cooling air through said nozzle, said throat providing a sec~ tion'of high velocity streams, a door hingedly and lamp supporting means mounted on said door and movable therewith to move said lamp into and out of projecting position. DONALD L. WOOD.