US2747481A - System for developing a film - Google Patents

System for developing a film Download PDF

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Publication number
US2747481A
US2747481A US417799A US41779954A US2747481A US 2747481 A US2747481 A US 2747481A US 417799 A US417799 A US 417799A US 41779954 A US41779954 A US 41779954A US 2747481 A US2747481 A US 2747481A
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United States
Prior art keywords
film
bath
developing
casing
plate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US417799A
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English (en)
Inventor
Normann Turolf
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Omega Louis Brandt and Frere SA
Original Assignee
Omega Louis Brandt and Frere SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Omega Louis Brandt and Frere SA filed Critical Omega Louis Brandt and Frere SA
Application granted granted Critical
Publication of US2747481A publication Critical patent/US2747481A/en
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03D—APPARATUS FOR PROCESSING EXPOSED PHOTOGRAPHIC MATERIALS; ACCESSORIES THEREFOR
    • G03D13/00—Processing apparatus or accessories therefor, not covered by groups G11B3/00 - G11B11/00
    • G03D13/007—Processing control, e.g. test strip, timing devices
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03D—APPARATUS FOR PROCESSING EXPOSED PHOTOGRAPHIC MATERIALS; ACCESSORIES THEREFOR
    • G03D3/00—Liquid processing apparatus involving immersion; Washing apparatus involving immersion
    • G03D3/08—Liquid processing apparatus involving immersion; Washing apparatus involving immersion having progressive mechanical movement of exposed material
    • G03D3/13—Liquid processing apparatus involving immersion; Washing apparatus involving immersion having progressive mechanical movement of exposed material for long films or prints in the shape of strips, e.g. fed by roller assembly
    • G03D3/135—Liquid processing apparatus involving immersion; Washing apparatus involving immersion having progressive mechanical movement of exposed material for long films or prints in the shape of strips, e.g. fed by roller assembly fed between chains or belts, or with a leading strip

Definitions

  • the present invention relates to a method of developing a film, in which the film is passed through a developing bath and then through a fixing bath.
  • This method is characterized in that the concentrations and the temperatures of the said baths are chosen such that a compromise is obtained between the most rapid velocity of passage and the sharpest development of the film, the duration of immersion of the film in both baths being the same.
  • the invention also relates to an installation for carrying out this method, which is characterized by two tanks arranged side by side in a case and containing a developer and a fixer respectively, and by a set of rollers adapted to guide the film through the baths, means being provided for raising the temperature of each bath to a predetermined value.
  • Figure l is a sectional view taken along the line I-I of Figure 3.
  • Figure 2 is a sectional view taken along the line IIII of Figure 3.
  • Figure 3 is a plan view, at a reduced scale, of an installation in accordance with the invention.
  • Two tanks 1 and 2 are arranged side by side in a case 3 and contain a developer 4 and a fixer 5 respectively.
  • a set of rollers 6 are adapted to guide the film 7 during its passage through the installation. These rollers are pivoted at the free ends of bars 8 fixed to the cover 9 of the case 3.
  • An inlet 10 is provided for the film 7 in a wall of the case 3.
  • two sponges 11 are provided, which are adapted to summarily wipe the film 7 when it comes out of the case 3.
  • a hot plate 12 is supported by means of feet 13 on the bottom of the case 3 and is connected by means of wires 14 to a source of electricity. Between the tank 1, containing the developing bath 4, and the hot plate 12 there is inserted a plate 15 of a semi-heat insulating material which poorly conducts heat. On the other hand, the tank 2, which contains the fixing bath 5, is separated from the hot plate 12 by a plate 16 of a heatconducting material. A thermostat 17, connected by means of wires 18 to the supply circuit of the hot plate 12, is fixed to the cover 9 of the case 3 and is immersed in the fixing bath 5 so as to keep its temperature substantially constant.
  • Both tanks 1 and 2 project outside the case 3, as shown in Figures 2 and 3, so that at every moment the levels of the baths 4 and 5 can be checked.
  • An opening 19 is provided in a wall of the case 3 so as to give passage to the liquid of each tank.
  • the film 7 After being exposed, the film 7 enters the case 3 through the inlet 10. It goes first through the develop- Patented May 29, 1956 ing bath 4 and then through the fixing bath 5, whereafter it passes between the sponges 11 before going out of the case 3.
  • the conventional development of a film requires a certain duration of immersion of the film, which is not the same for the developing bath and for the fixing bath. This duration also varies with the temperatures of the said baths. If the solutions are more or less diluted and if the temperature of each bath is suitably chosen, it is possible to obtain a compromise between the most rapid velocity of passage and the sharpest development of the film. This result is achieved by means of the installation as shown and described.
  • the developing bath 4 remains at a temperature which is lower than that of the fixing bath 5, owing to the insertion of the badly conducting plate 15.
  • the temperature of the developing bath 4 is maintained between 34 and 40 C., and that of the fixing bath 5 between 40 and 46 C., but these values may be greater or lower than these limits.
  • the developing bath 4 contains 350 grams of the product sold under the trade name Kodak Developer Powder for 1125 cm. of solution, whereas the fixing bath 5 contains 275 grams of the product sold under the name Kodak Fixer Powder for 1125 cm. of solution. These values are not limitative.
  • the film 7 is advanced by hand traction and the result of the development determines the speed at which the film should be drawn. This advancing movement could of course also be effected automatically with the help of a motor.
  • the speed of passage of the film through the baths lies between 20 and 30 cm./min., but may be greater or less than these limits.
  • the invention is advantageously applied to the development of the films used in certain time-keeping apparatus comprising a camera, such as for instance the apparatus disclosed in my co-pending application Serial No. 417,798, filed at the same date. It enables one to obtain within an extremely short time the registered results. It is to be understood, however, that the invention is not limited to this particular application.
  • a film processing device through which a film is adapted to be drawn to subject the film successively to two processing liquids, comprising, in combination, a hollow casing formed with a film inlet and a film outlet, two tanks arranged side by side in the casing and containing a developing bath and a fixing bath respectively, a set of rollers adapted to guide the film through the baths, an electrically heated plate arranged at the bottom of the casing, a semi-heat insulating plate and a heat conducting plate supported by the said electrically heated plate, the developing tank supported by the said semiheat insulating plate and the fixing tank supported by the said heat-conducting plate, so that the fixing bath is heated to a temperature higher than that of the developing bath, a thermostat connected to the supply circuit of the electrically heated plate, the said thermostat immersed in the fixing bath, both tanks projecting outside the casing so that the levels of the baths can be checked, and a film wiper positioned at the said casing outlet to wipe the film as it leaves the casing.
  • a film processing device through which a film is adapted to be drawn to subject the film successively to two processing liquids, comprising, in combination, a hollow casing formed with a film inlet and a film outlet, two tanks arranged side by side in the casing and containing a developing bath and a fixing bath respectively, a set of rollers adapted to guide the film through the baths, an electrically heated plate arranged at the bottom of the casing, a semi-heat insulating plate and a heat conducting plate supported by the said electrically heated plate, the developing tank supported by the said semiheat insulating plate and the fixing tank supported by the said heat conducting plate, so that the fixing bath is heated to a temperature higher than that of the developing bath, both tanks projecting outside the casing so that the levels of the baths can be checked, and a film wiper positioned at the said casing outlet to wipe the film as it leaves the casing.
  • a film processing device through which a film is adapted to be drawn to subject the film successively to two processing liquids, comprising, in combination, a hollow casing formed with a film inlet and a film outlet, two tanks arranged side by side in the casing and containing a developing bath and a fixing bath respectively, a set of rollers adapted to guide the film through the baths, an electrically heated plate arranged at the bottom of the casing, a semi-heat insulating plate, and a heat conducting plate supported by the said electrically heated plate, the developing tank supported by the said semiheat insulating plate and the fixing tank supported by the said heat-conducting plate, so that the fixing bath is heated to a temperature higher than that of the developing bath, both tanks projecting outside the casing so that the levels of the baths can be checked.
  • a film processing device through which a film is adapted to be drawn to subject the film successively to two processing liquids, comprising, in combination, a hollow casing formed with a film inlet and a film outlet, two tanks arranged side by side in the casing and containing a developing bath and a fixing bath respectively, a set of rollers adapted to guide the film through the baths, an electrically heated plate arranged at the bottom of the casing, a semi-heat insulating plate' and a heat conducting plate supported by the said electrically heated plate, the developing tank supported by the said semiheat insulating plate and the fixing tank supported by the said heat conducting plate, so that the fixing bath is heated to a temperature higher than that of the developing bath.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Photographic Processing Devices Using Wet Methods (AREA)
US417799A 1953-04-21 1954-03-22 System for developing a film Expired - Lifetime US2747481A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH2747481X 1953-04-21

Publications (1)

Publication Number Publication Date
US2747481A true US2747481A (en) 1956-05-29

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Family Applications (1)

Application Number Title Priority Date Filing Date
US417799A Expired - Lifetime US2747481A (en) 1953-04-21 1954-03-22 System for developing a film

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US (1) US2747481A (fr)
CH (1) CH308589A (fr)
FR (1) FR1104379A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3093051A (en) * 1958-08-14 1963-06-11 Ritzerfeld Wilhelm Apparatus for treating printing foils
US3165047A (en) * 1961-02-06 1965-01-12 Seymour L Hersh Photographic processing apparatus
US3216342A (en) * 1962-02-05 1965-11-09 Pavelle Corp Photographic processor

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1923108A (en) * 1931-12-30 1933-08-22 Robert F Mehl Means for heating photographic films or plates
US1967889A (en) * 1930-08-05 1934-07-24 Keller Dorian Colorfilm Corp Machine for developing goffered moving picture films
GB470197A (en) * 1936-03-05 1937-08-11 Tomas Nicolau Grino Improvements in photographic cameras
US2475973A (en) * 1945-09-28 1949-07-12 Eastman Kodak Co Safe-handling film processing unit
US2618210A (en) * 1950-03-28 1952-11-18 Gen Precision Lab Inc Rapid developer trap

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1967889A (en) * 1930-08-05 1934-07-24 Keller Dorian Colorfilm Corp Machine for developing goffered moving picture films
US1923108A (en) * 1931-12-30 1933-08-22 Robert F Mehl Means for heating photographic films or plates
GB470197A (en) * 1936-03-05 1937-08-11 Tomas Nicolau Grino Improvements in photographic cameras
US2475973A (en) * 1945-09-28 1949-07-12 Eastman Kodak Co Safe-handling film processing unit
US2618210A (en) * 1950-03-28 1952-11-18 Gen Precision Lab Inc Rapid developer trap

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3093051A (en) * 1958-08-14 1963-06-11 Ritzerfeld Wilhelm Apparatus for treating printing foils
US3165047A (en) * 1961-02-06 1965-01-12 Seymour L Hersh Photographic processing apparatus
US3216342A (en) * 1962-02-05 1965-11-09 Pavelle Corp Photographic processor

Also Published As

Publication number Publication date
CH308589A (fr) 1955-07-31
FR1104379A (fr) 1955-11-18

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