US1883510A - Enlarging apparatus - Google Patents

Description

Oct. 18, 1932. C, BORNMANN 1,883,510

ENLARGING APPARATUS Filed Dec. 17. 1930 2 Sheets-Sheet 2 [lll/IIIA S//%/// w m5. L

INVENTOR CARL BORNMANN Patented Oct. 18, 1932 UNITED STATES PATENT OFFICE CARL BORNMANN, Ol BINGHAMTON, NEW YORK, ASSIGNOR T AGFA. ANSCO CORPO- RATION, OF BINGHAMTON, NEW YORK, A CORPORATION OF NEW YORKv ENLARGING .APPARATUS Application led December 17, 1930. Serial No. 503,003.

This invention relates to the enlargement of pictures and more particularly to an apparatus for makin enlarged positives directly from relative y small negatives.

One object of this invention is to provide an apparatus for making enlarged positives from negatives, with an eiiicient and easily operated lighting system.

Another object is the provision o f aJiovel apparatus for direct enlargement including a film guiding means.

These objects are accomplished by providin a compact apparatus having a source of lig t, a holder for a negative, a holder for;l a sensitized surface upon which the enlarged positive is to be made, a lens system adapted to direct light from the source through the negative to the sensitized surface and an additional source of illumination providing a dim light for loading and adjusting the apparatus.

The novel features which I believe to be i characteristic of my invention are set forth with particularity in the appended claims. The invention itself, however, together with further objects and advantages thereof will best be understood by reference to the following description and to the figures of the accompanying drawings which Figure 1 is a perspective view of a device embodying features of this invention,

Figure 2 is a s ide elevation, partly in section, of a similar device embodying features of this invention,

Figure 3 is a front elevation of that portion of the device shown in Figure 1 which sup.

Inthe several figures like reference characters indicate like parts.

Referring now to the drawings in detail and more particularly to Figures 1 and 2, reference character'l indicates a base number, which may be made of any suitable material, having a substantially vertical support meinber 2. A lamp housing 3 is carried by support and has a cover 4 to give access to its interior and to projection lam 5 supported therein by means of lamp base 7). An adjustable lens mount 8, having either one or a plurality of lenses 9, is supported in a wall of lamp housing 3. A. horizontal box-like support member 10, carried by vertical support member 2 is positioned adjacent housing 3 and provides a support for a second adjust-4 able lens system 11 and photographic negatitvQsupporting means indicated generally a Negative supporting means 12 may comprise two transparent plates 14 and 15 illustrated on a larger scale in Figures 5 and 6. Plates 14.- and 15 are hinged together by flexible member 16 which is secured to both plates and provides a space between plates 14 and 15 when said plates are parallel to each other. A ilm 17 or other negative may be clamped between plates 14 and 15, which are disposed on horizontal support 10 as shown in Figures 1 and 2. Spring members 18 may be secured to support 10 and press on the upper surface of plate 14 to hold film 17 securely between plates 14 and 15. Support 10 may be rovided, on opposite sides thereof, with adjustable guide plates 19 each having a slot 20 therein to permit plates 19 to be raised or lowered relative to support 10. Plates 19 may be secured to support 10 in adjusted position by screws and washers 21 or by other suitable means. Each plate 19 has an upturned portion 22 to facilitate adjustment thereof. Each plate 19 also has a relatively wide groove or notch 23 in one end thereof so that, when the grooved ends project above support 10, they provide guiding means for ilm 17. Grooves 23 should be slightly wider than iilm 17 so that the ilm may readily slide through them. Support 10 is provided with laterally extending members 24 and 25 to keep the curled-up ortions of lm 17 widely separated, as clear y shown 'in Figure 3, so that said portions of the film will not interfere with the passage of light from lamp 5 to a positive sensitized surface 26.

Sensitized surface 26 may be rovided by a sheet of paper or other suita le material having a light sensitive coating thereon. A holder or frame 27 is provided on base 1 for keeping surface or sheet 26 fiat and in proper position relative to lenses 9 and 11. Frame A27 has its bottom partly cut away on the inner portions thereof to provide space for the edges of sheet 26 and has its bottom entirely cut away at one end as indicated at 28 so that photographic paper or other carrier of a sensitized surface 26 may be slipped into and out of the frame 27. Grooves or notches 29 and 30 in holder 27 and base 1 respectively may also be provided to enable the operator of the device to grasp sheet 26.

A lamp 31 and a socket 32 therefor are disposed on the op osite side of vertical support 2 from holder 27, the socket 32 bein secured to base 1. The lamp 31 is preferaly ruby colored and of low candle power. It is laced in back of support 2 so that its light will not fall directly on surface 26 but it should provide suflicient light for adjusting the apparatus.

Figure 8 shows diagrammatically the electrical connections for lamps 5 and 31 which are connected in series with each other and to a source of electrical energy 33. A switch 34 is connected in parallel with ruby lamp 31. The voltages and currents of lamps 5 and 31 should be such that, with switch 34 closed, lamp 5 will burn brightly but safely at the full voltage of source 33, and with switch 34 open, lam 5 will give only a small amount of light o a dull red color and most of the volta e of source 33 will be impressed on lam 31. witch 34 may be provided with a kno 35, by turning which switch 34 may be quickly opened or closed.

The devices described above and shown in the drawing are operated as follows: With switch 34 open, lamp 5 gives only a dim red light and lamp 31 gives a ruby light which affect the photographic emulsion 26 very slightly. By the illumination thusprovided the operator can place a negative film or plate between plates 14 and 15 and posit-ion them properly with respect to support 10 and lens systems 9 and 11. The operator can also placca piece of photographic paper in holder 27 and adjust lens systems 9 and 11 so that light from lamp 5 projects the image on the negative to surface 26 clearly and sharply. Switch 34 is then closed for a period of time to properly expose surface 26 and is then opened again. The photographic paper carrying the exposed emulsion 26 may then be developed in the usual manner and an enlarged positive print of the negative will be obtained. If the negative is inthe form of a strip of film, any picture on the film strip ma be printed the esired number of times an then the strip may be pulled through grooves 23 in plates 19 and between transparent plates 14 and 15 until the next desired negative picture is in position for printing. If the negative is a wide film or plate the guides 19 are lowered relative to support 10 to provide an unobstructed surface on which the negative is ositioned, either with or without the aid o plates 14 and 15.

Several embodiments of this invention have been described in the foregoing speci-l fication and illustrated in the accompanying drawings but it should be understood that the invention itself is limited onl by the intent and scope of the appended c aims.

I claim:

1. An apparatus for printing enlarged positives directly from negatives comprising in combination, a, photographic negative lm strip, su porting means therefor comprising a pair o guide plates having grooves in the"- ends thereof slightly wider than said film, said plates being disposed substantially perpendicular to that portion of the lilm which is in position to be printed, means for supporting a sensitized surface at a predetermined distance from said negative, 'a lamp, a pair of laterally extending members for keepin the remaining portions of said ne ative lm out of the pathl of light of sa1d lamp to the sensitized surface means for supportin said lamp at a predetermined distance rom said negative on the side thereof oppositesaid sensitized surface, means for projecting light from said lamp through said- -f negative to said sensitized surface, a second lamp adjacent said sensitized surface, a source of electrical energy, and means whereby the first mentioned lamp may be connected to said source or both of said lamps may be connected in series to said source, as desired.

2. An apparatus for printing enlarged positives directly from negatives comprising in combination, a support having a horizontal member and a substantially vertical member, a lamp and a housing therefor carried by said vertical member, a holder for a light sensitive sheet 0n said horizontal member, a holder for a photographic negative carried by said vertical member and disposed between said lamp housing and the first mentioned holder, a system of lenses for projectin from said negative an ima e thereon to sa1d light sensitive sheet, wherey light from said lamp causes an enlargement of said image to be printed on said sheet, said holder for the photographic negative including a box like horizontal member secured to said vertical member and having apertures in the top and bottom thereof, said apertures bein aligned with said lens system, a portion o said lens system dis osed in the a rture in the bottom of said sox like memble', a air of hinged transparent plates positione on the to of said box like member in alignment with he aperture therein, said plates being adapted to hold the hotographic negative therebetween, and in a ignment with said lens system, and a plurality of springmembers secured to said box like member and exerting pressure on said plates and said negative whereby said lates and said negative are hed in their a jlflllsted csitiixiis.

n testmon w ereo a m signature.

y CARL BOBMANN.

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