Abstract:
It is known to apply processing solution to photographic material using a high speed moving surface. High speed rotating drums have been used to transfer processing solution from a reservoir to the material. Horizontal belts are also known. However, such arrangements require large volumes of processing solution in order to operate effectively. Described herein is a processor (1) comprising a vertically mounted high speed belt (10) which both transfers processing solution (26) from a reservoir (20) onto photographic paper being processed, and provides agitation at the paper surface. Two transport belts (30, 32) are provided, one on either side of the belt (10) to assist in the transport of paper through the apparatus. An arrangement according to the invention has the advantages that only low volumes of processing solutions are required, good surface agitation is provided, and it can be fitted into conventional photographic processing apparatus.
Abstract:
It is known to provide agitation of processing solutions in photographic processing apparatus using jets. Jets are also known for urging material between sets of rollers. However, such jets are not known to impart drive to material being processed as it passes through the apparatus. Described herein is an arrangement in which material (M) is transported through a narrow elongate tank (20) by means of processing solution which is directed into the tank (20) by means of high speed jets (24, 25). The jets (24, 25) have two functions, namely to drive the material (M) through the tank (20) and to supply processing solution to the tank (20) simultaneously. Such an arrangement has the advantage of providing high speed processing apparatus which occupies minimum space and has few moving parts.
Abstract:
A method of photographic processing employing a redox amplification solution containing hydrogen peroxide wherein the hydrogen peroxide is provided by the addition of a controlled weight of a solid compound which provides free hydrogen peroxide on dissolution in the amplifying solution and wherein the processing temperature is below 50 DEG C.
Abstract:
It is known to dry photographic paper using radiant heat and air streams passing over the surface of the paper. However, it is important that the paper is not over- or under-dried. Described herein is a method and apparatus which dries photographic paper without the risk of over- or under-drying it. This is achieved by sensing the moisture remaining in the paper after it has passed through an initial heating stage, and using the sensed moisture content to control the power supplied to heaters and other devices in subsequent heating stages which assist in the removal of moisture from the paper.
Abstract:
Described herein is a shutter mechanism (10) suitable for use in a single-use camera. The mechanism (10) comprises a mounting plate (12, 120) and a shutter member (14, 140) mounted thereon. Shutter member (14, 140) comprises a spring (141) connected to a shutter blade/trigger member (142) by means of arm portions (143, 144), the connection between the spring (141) and the shutter blade/trigger member (142) to the arm portions (143, 144) being effected by hinges (145, 146, 147, 148). The mounting plate (12, 120) comprises a circular disc (120) having recess portions (121, 126) in which spring (141) and shutter blade/trigger member (142) are respectively located. Depression of shutter blade/trigger member (142) moves it to a metastable position against the action of the spring (141), and once through that position, the action of the spring (141) accelerates the shutter blade/trigger member (142) over the lens (not shown) to provide an exposure for photographic material mounted within the camera.
Abstract:
When using unstable processing solutions, high recirculation and/or replenishment rates may be required. However, when replenisher is added to a processing tank, a noticeable drop in the temperature of the processing solution may occur. Such a drop in temperature may lead to variable photographic sensitometry of the material being processed. Described herein is apparatus in which temperature control means (28) are provided to ensure that the temperature of the solution being added to the processing tank does not produce such a temperature drop.
Abstract:
A low volume thin tank photographing apparatus includes a tank (1) having a narrow passage (2) through which imagewise photographic material (5) to be processed is passed. At the inlet (7) of the tank (1) a reservoir (7) for photographic processing solution (8) is provided. Solution is circulated in a circuit (14) between inlets (9, 10), and outlets (11, 12).
Abstract:
A portable film processing unit in the form of a case like container. The base (10) of the container includes processing units (30) which accommodate spiral holders onto which film to be processed can be wound automatically. The lid (14) houses containers (18, 19, 20) which contain chemicals for processing the film. The chemicals can be fed to the processing units (30) by way of valves which are operable under the control of an on-board computer located in a control section (45).
Abstract:
It is known to treat the effluent resulting from photographic processing apparatus. Such treatment takes the form of either neutralization where the effluent is mixed with a neutralizing solution prior to disposal, or evaporation where the effluent is heated to form a precipitate and a concentrated liquid portion prior to disposal. However, both these techniques have disadvantages they do not account for toxic particles which may be suspended in the solutions. Described herein is apparatus in which photographic effluent can be treated to provide harmless end products which can be disposed of directly. The apparatus comprises a mixing unit (10) in which the effluent (S1) is mixed with treatment chemicals (S2, S3, S4, P1, P2, P3) and is then passed to a separation unit (20) in which the treated effluent is separated into non-toxic liquid and solid phases. A computer (100) is used to control all stages of the treatment of the effluent.
Abstract:
In photographic processing apparatus in which continuous processing is carried out in a tank having a low volume, it is difficult to obtain sufficient agitation of the processing solution. This problem arises because processing solution adheres to the emulsion surface of the material being processed, and access of fresh processing solution to the emulsion surface is restricted in the narrow confines of the tank. Described herein is an arrangement in which the agitation of the solution is improved. The arrangement includes an element (16) which is positioned over a feed slot (18) through which processing solution enters the tank (10). The element (16) serves to keep the emulsion surface (26) of the material (24) being processed away from the tank wall (14) and allows access of processing solution to the emulsion surface.