US1566260A - Light-focusing apparatus - Google Patents

Description

Dec. 15 1925' LIGHT FOCUSING APPARATUS 2 Sheets-Sheet 1 Filed June 1922 m N'EI Inventor Cromwell A. Blialvorson din,

His Aitorney.

Dec 15, 192 v.

c. A. B. HALVORSON, JR

LIGHT FOCUSING APPARATUS 1922 2 Sheets-Sheet 2 Filed June 50 Inventor:

Cromwe1lA.B.Ha1vorson m by Ma /Q Patented Dec. 15, 1925,

UNITED STATES PATENT OFFICE.

CBOMWELL a. B. nanvonson, 3a., or LYNN, massacnusnrrs, assrsnon 'ro enn- ERAL nnacrmc GOMBAN/Y, A CORPORATION or NEW YORK.

LIGHT-FOCUSING API 'ARATUS.

Application filed June 30, 1922. Serial No. 571,966.

To all whom it may concern Be it known that I, CROMWELL A. B. HALvonsoN, Jr., a citizen of the United States, residing at Lynn, county of Essex,

5 State of Massachusetts, have invented certain new and useful Improvements in Light- Focusing Apparatus, of which the following is a specification.

My invention relates to the method of 1 and means for adjusting the sourceot light. for a projector and for rapidly replacing one source for another or a defective one for a non-defective one and insure-that the new source will instantly find its proper position in the optical system.

Motion picture machines and the like whichhave made use of an arc-light for projection are now, in a great many instances, using incandescent lamps instead and as is well known the filament of such lamps breaks from time to time and unless some provision is made for quick replacement, annoying delay results. results from the fact that the filament of such lamps must be accurately positioned with respect to the optical system and since no two lamps have their filam'entin the same place, each individual lamp must be adjusted to bring its filament into proper position. Heretofore meanshave-been devised which involve the use of a removable lamp socket which ma y be withdrawn as a' whole with the injured lamp just as a drawer is removed from its pigeon hole. The circuit for the socket is closed by way of the beariugs when the socket is slipped into place. Upon cursory consideration it might be thought that if the lamp is adjusted with respect to the socket up and down; and the socketback and forth in the adapter; and from right to the left that this would supply all the adjustment necessary to bring the filament into proper position; but when it is considered that, the amp is sometimes tilted it will be realized that the lamp as a whole must be tiltedback to bring the filament into position. And that. is not all. Provision must also be made for rotating the filament about the major axis of the lamp to bringthe plane of the filament at right angles to the major axis of the rojector thereby presenting the greatest width of the filament to the condenser lens.

The delay lamp setting equipment has been provided heretofore but which does not provide for the adjustment of the lamp by tilting it until .the filament plane is brought into proper position. 'Nor do they provide in addition means for adjusting the filament up and down. In any event the devices ol the prior art are cumbersome and comphcated being provided with reflecting mirrors and pivotal structures.

It is another object of my invention to provide a lamp setter or adjuster devoid of all such complications and which at the same time provides for all the adjustments above indicated. By the provision of such an adjuster, the attendant may, while the motion picture machine is in operation, set in readiness a number of lamps for immediate use in the event that the lamp in operation burns out. Such adjustments, of course, can be just as conveniently made before the picture machine is started in operation. Inany event, it is more convenient to use the lamp setter than it is to adjust the lamp in the lamp housing.

I also. provide other details of improvement tending to increase the efiiciency and serviceability of devices of the above character.

The means by which the above ends are accomplished are hereinafter more fully set fortlrand claimed, reference being bad to the accompanying drawin s.

In the drawings, Fig. '1 is a perspective view of the lamp setter opened to receive a lamp and socket. In this figure the socket is also shown to one side with the lamp in position. .Fig. 2 is a section in elevation through the socket; Fig. "3 is a section through the projector housing showing the adapter and socket in osition; Fig. 4 is a section of the socket ut taken at right angles to the section of Fig 2;, Fig. 5 is a top view of the adapter; ig. 6 is a Side view of the same; Fig. 7 1s a side View of.

the lamp in the socket.

Referring more 1n detail to the drawings the socket, Figs. 2, 3 and 4, has a base 2.

On the under side of the base there are two metallic contact strips 3 and 4, one on each side, which are ordinarily about or 3/; of an inch wide and from 1 to 1 inches long and these strips have metallic connections'as shown in Fig. 4 with metallic tenninals 5 and 6 respectively which are engaged by the terminals of the lamp. The terminal 6 as shown is the central terminal under which there is an adjusting set screw 7 for regulating the height of the terminal (3: the outer terminal 5 is made up of three sections a, F) and a. The sections a and b are closed metallic rings whichare held together by means of bolts 7 and 8. It will be observed that the elements a, b and 0 form a universal joint structure, the element c having its upper and lower rims 9 and 10 chamlered. The elements a and b are-prm ided with corresponding sloping surfaces 11 and 12. It will be observed that element 0 is in the form of a split ring. The lamp 13 may be an ordinary Mazda motion icture lamp. The dotted lines in Fig. 2 indicate how the lamp is held between the split ring 0 and the in nor terminal 6. Obviously, therefore, the lamp 13 may be tilted in any direction and tightly clamped by screwing the bolts 7 and l n 8 WlllCll of course compresses the ring 0 against the lamp terminal in the socket.

In the base 2 (Fig. 1) there is a set screw 14 for adjusting the socket with respect to the adapter 15 (Fig. 5) or with respect to the base of the lamp setter (Fig. 1). The adapter also has an adjusting screw 16 which has a circular groove at the neck of the screw that is engaged by the heel adjusting hecl plate 17. This heel plate may be set forward or back to any desired extent and clamped in such position by means of the nut 18. On the surface of the adapter there is provided a pair of metallic contact plates 19 and 20 to which the source of current supply may be connected. These contacts are engaged by the metallic strips 3 and 4 on the under side. of the base 2 (Figs. 1 and 4), when the base is slipped in place on the adapter as shown in Fig. 7. Thedistance that the base can he slid in the groove on the adapter and on the holder setter, as will appear, is determined by the head of the screw 14, (Fig. 7). The groove for the base is formed by the bottom and sides of the adapter and by the top stri s 21 and 22 that are screwed to the top 0 the holder, a similar construction a pearing on the holder, (Fig. 1) It it is ound that the lamp is set too far to the left (Fig. 7) it may be brought toward the right by turning the screw 14 clockwise; or it may be set further back, to the left, by

aceaaeo? pressing the socket back1mtil-the screw head strikes the heel plate 17. Obviously therefore by means of screws 14fand'7 (Figs. 7

4 and 7) thelamp may beset upor down and to the right or to the left (Fig.7).

Referring to Fig. 2, it will beseen that, in

the set screw 7 there is a helical spring 23 (see also Fig. 4) located between this screw 7 and theterminal 6, wh'ichspring serve; to make the contact 6 a yieldingcont'acts:

that the lamp may be. rotated or tilted l. the socket without breaking theelcctrical connection. This contact 6 has a down wardly projecting neck on the lower end of which there is a head terminal. The object of the head terminal is to prevent the spring 2?, from throwing the terminal out of position when the lamp is removed. it will he observed that on one side of the groove in the adapter (Fig. 5) there is a spring 25 that maintams the socket snugly against the opposite side of the groove and which serves to prevent-any play of the socket in the adapter.

It now remains to consider the lamp setter (Fig. 1). This setter may be made in the form of a metallic frame 24. It is provided with a groove similar to that provided in the adapter which groove is also for the purpose of receiving the lamp holder. To one side of this groove in the setter there is a spring 26 which also serves to take up any loose play between the socket and the setter frame and which therefore corresponds to the spring 25 (Fig. 5;). On the upper side of the setter there is a horizontal strap arm 27 which is hinged as indicated and on the opposite side of the frame from the hinge there is a latch spring 28 which is used to latch arm 27 to imprison the lamp 13 when the socket 5 is in the lam setter. In the frame opposite the arm 27 tliere is a V slot 29 and a corresponding V slot 30 in the arm 27 located diametrically opposite, which slots serve for sighting the filament to bring it into a. given osition with respect to the setter frame. i lso on the sides of the frame there are rovided a pair of windows, each opposite the other and each having ahorizontal ledge from which the pins 31 and 32 project as shown. These pins and the ledges from which they rise serve for sighting the filament to place it in proper position with j respect to the setter frame. It will be understood that the line of sight between the '32. By means of these set screws the lamp 13 may tilted in either the V sight plane or in the pin sight plane, On the inside-of the hinge arm 27 I have provided a tension spring which is so set as to press the lamp 13 toward either of the set screws33 or 34 and which therefore serves to maintain the lamp against these set screws when socket and lamp are set in the lamp setter; Now it is to be understood that'the intersection of the V sight axis with the pin sight axis 10- cates azpoint' which we will call the 0 tical point of the setter and which point asa peculiar relationto the'point in the actual optical system, which" latter point we will,

-'call thea'ctual optical point,;'and with respect to which latter the-filament-should be properly set in'the lampjhousingt This relaj- 1 tion is such that if the filament isset in the setter in a given position relative to the set: 'ter 'opticalfpoint, then when the base and lamp are transferred to the adapter in the lamp housing, the filament will be placed in the same relative position to the actual optical: point and viceversa. In order to obtain this relation the altitude of the setter optical.

pointiabove the holder is identical with the altitude of the actual optical point above the adapter in the housing. Therefore, it is ob- I vious that with my inventionany number of lamps may be adjusted with respect to their sockets and with respect to the optical point of the setter so that a lamp may be replaced in a moment in its proper optical relation to the actual optical system the instant that the ment with reference to/the other;

It wi'llbe seen that without the sighting elements on opposite sides of the setter, Fig. 1, it would not be possible to effectively determine whether the filament ofthe lamp 13 is at the proper height, One sighting element alone would be insufiicient to determine accurately the correct height of the filament.

It will be seen further. that the filamentniay -be adjusted not only in two planes at rightangles to each other but also up and down with respect to the base 2, by means of the screw 7 and further along a line in theone plane parallel to the other plane or along the line of intersection of the two planes. I With the means that 'I provide a motion picture device maybe maintained in eflicient operation, with one ,lamp setter, two-bases,

and two sockets since while the motion picture machlne is operating} a lamp may be adjusted and made ready for instant use in case the lamp in use burns out.

While I have shown and disclosed myinr vention in 'conn'ectionwith a specific form of construction it will be understood that I do not wish to be limited to this form inasmuch as in view of the disclosure variations ofmy invention may readil suggest themselves to others which would all within the scope of the claims appended hereto; 7 7

,What 'I claim'as newand desire to secure by Letters Patent of-the United States is 1. The combinationofa-lamp setter with a lamp and a universal joint socket'for the lamp whereby the lamp maybe tilted. in the setter along either of two intersecting lanes and mechanicalmeans for raising or 'owering the lamp within the socket;

2. In combination with alamp settera lamp, a ball andsocket joint and means forbindin'gsaid lamp to said ball and socketafter the lamp has been set through the medium of said setter and mechanical means for raising or lowering the lamp the. V

socket.

lamp, a ball and socket lamp hol er in said setter for. setting said lamp vby tiltin the" lamp in said holder'alongeith'er 0 two intersecting planes and mechanical means for raising or loweringthe lampwithin the socket.

3. In combination'with a lam setter, at

4. In combinationwith a 'lainpi'setterya" lamp, a balland socket lamp holder in said setter for setting said lamp by tilting lamp in said holder along-either of two inter;

the

'sectmg planes and. meanslonsaid setter for tilting said lamp, and means on"the=s'etter-.

for determinin the proper adjustment of the lamp in said planes. l

5. In combination with an optical system,

a; lamp, mounting means for saidflamp, v means for moving the lamp in'onedirectlom.

means for moving the lamp at rightangles thereto means for rotating the" lamp inone right angles to thefirst plane.

6. In combination with an optical system, a lamp, mounting means for said lamp, means for moving the lamp in one direction, means for moving the lamp'vatright angles thereto, means for rotating the lamp in one plane'and means for rotating the lamp at plane and means for rotating the lamp at means involving a lam I setter.

7. In combination wlth an optical system, a lamp mounting means for said lamp, means for moving the lamp in one direction, means'for moving the lamp at right angles thereto, meansffor rotating the lamp in one right angles to the :first plane, said last plane and means for rotating the lamp at thereto, means for rotating the lamp in one plane and means for rotating the lamp at right angles to the first plane, said last means involving a lamp setter, said lamp setter including a lamp holder and including sights for determining how much the lamp is moved in any direction.

9. The combination of a lamp setter, a lamp socket and an electric lamp, the socket comprising a universal joint, means on the setter for adjusting the lamp in either of two planes While thebase of the socket remains stationary.

10. A lamp setter comprising a frame provided with sighting elements in two intersecting planes, a carriage mounted to slide in said frame, a lamp socket upon said carriage comprising a universal joint adapted to receive a lamp and adapted to permit the lamp to be tilted along either of two intersecting planes, and means associated with said socket for raising or lowering the lamp withinthe socket.

11. A lamp setter comprisinga frame provided with sighting elements in two inter secting planes, a carriage mounted to slide in saidframe, a lamp socket upon said can riage comprising a universal joint adapted to receive a lamp and adapted to permit the lamp to be tilted along either of two intersecting planes, means associated with said socket for raising or lowering the lamp within'the socket, and micrometer means for ad justing the carriage.

In Witness whereof, I have hereunto set my hand this 28th day of June, 1922.

CROMWELL A. B. HALVORSQN, JR.

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