JPS63259661A - Method for developing photography - Google Patents

Abstract

PURPOSE:To enable the development of a photosensitive material with high sensitivity by carrying said material within a long and slender developing bath which is arranged from the inlet part to the outlet part of said material, and by supplying a developer to said bath along the direction of carrying said material, followed by throwing away it, and by carrying said material at a speed faster than the theoretical moving speed of the developer. CONSTITUTION:The photosensitive material P is carried within the long and slender developing bath 28 which is arranged from the inlet part 42 to the outlet part 44 of said material P, and the developer is supplied to the bath 28 along the direction of carrying the material P and thrown away, and the material P is carried at the speed faster than the theoretical moving speed of the developer. Namely, as the developer supplied to the bath 28 is thrown away, the fresh developer is always supplied to the material P, and the bath 28 is in contact with air only at the inlet part 42 and the outlet part 44, and the intermediate part of the bath 28 is not in contact with air. Thus, the development with the high sensitivity is carried out, without bring fatigued the developer by air oxidation. Especially, the sensitivity of the developer is improved without bringing uneven development by carrying the material P at the speed faster than the speed of carrying the developer.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a photographic development method for processing the development of light-sensitive materials.

[Background technology] Generally, when developing a photosensitive material, a tick equipped with rollers for loading the photosensitive material is immersed in a main body filled with a developer, and the photosensitive material is sequentially transferred to these rollers. The film is wrapped around the paper and transported, thereby performing the development process.

For this reason, it is necessary to use a large amount of developer to fill the developer tank, and these are circulated and reused. Therefore, the developer gradually undergoes air oxidation, and the degree of air oxidation is particularly high because the air contact area of the developer tank is large.

In order to reduce the amount of developing solution used, a structure in which the part through which the photosensitive material passes is shaped like a slit has been proposed (Japanese Patent Publication No. 1549/1986), but the developing solution is still circulated and reused, and the sensitivity is high. Development is not possible.

In view of the above facts, the present invention aims to provide a photographic developing method that uses a small amount of developing solution, reduces air oxidation, and can perform highly sensitive development.

[Summary and operation of the invention] The present invention provides a long and narrow developing bath from the inlet to the outlet of the photosensitive material to convey the photosensitive material, and supplies the developer to the developing bath along the direction of conveyance of the photosensitive material to make it disposable. In addition, the photosensitive material is characterized in that it is transported faster than the theoretical moving speed of the developer.

For this reason, in the present invention, the developer supplied to the long and narrow developing bath is disposable, and fresh developer is always supplied to the photosensitive material. Since the intermediate portion never comes into contact with air, developing solution fatigue due to air oxidation is eliminated, and development with high sensitivity is achieved. In particular, photosensitive materials are transported faster than the developer to eliminate uneven development and improve sensitivity.

The structure of the developing device is simplified by supplying the developer from the inlet of the developing bath and overflowing from the outlet.

[Embodiment of the Invention] As shown in FIG. 1.2, the outer box 12 of the photographic developing apparatus 10 to which this embodiment is applied is formed into a box shape with an upper opening made of thin plate material, and a main body 14 is inserted into the outer box 12. is accommodated. This main body 14 is formed by bending a thin plate material such as metal, and has a box shape with an open upper part. This main body 1
The upper end of the outer box 12 is a flange 14A having an enlarged inner diameter, and is fixed to the upper end of the outer box 12 via a stay 16 and a pole 18.

A temperature regulating tank 20 is provided between the main body 14 and the outer box 12, and hot water is supplied as needed. The upper end of this temperature control tank 20 can be closed with a lid plate or the like.

A pair of mutually parallel end plates 14B in the main body 14 have a pair of notches 14C formed from the lower end toward the upper end, and thereby the end plate 14B has three protrusions facing downward. The side plate 14D of the main body 14 is integrally connected at both ends in the width direction to the end plate 14B, as shown in Figure MS4.

For this reason, this side plate 14D is connected to the outer peripheral end of the end plate 14B to form three recesses 14E in the main body 14. Further, the side plate 140 is bent into a semicircular arc shape (radius R) at the lower end of the recess 14E, and a horizontal flat surface is formed at the upper end of the notch 14C.

A rank 24, which is a member inserted into the main body 14, is inserted from the upper end opening.
is inserted. As shown in FIGS. 5 and 6, this rack 24 includes a pair of side plates 24A and a body plate 24B connecting these side plates. The side plate 24A has a pair of recesses 24C formed upward from the lower end into which the notch 100 portion of the main body 14 enters, thereby forming a pair of recesses 24C facing downward.
It has a shape in which each protrusion 24D protrudes. These protrusions 24D are for insertion into the recess 14E of the main body 14.

Both widthwise ends of the body plate 24B are connected to the inner side of the protrusion 24D except for the lower end. The body plate 24B is connected to the side plate 24A at a position extending inward from the outer periphery by a certain amount. Therefore, this body plate 24B has a concave portion 24G.
The upper end part is a semicircular arc part 24E (radius R),
Further, at the lower end of the protrusion 24D, an arcuate recess 24F (radius R) is formed concentrically with the curvature of the lower end of the protrusion 24D.

Therefore, when the rack 24 is inserted into the main body 14, one main body 1
An elongated slit-like space (thickness L) is formed between the inner periphery of the body plate 24B and the outer periphery of the body plate 24B, and a developing bath 28 is formed by supplying the developer.

The lower end of the developing bath 28 has a cylindrical space whose axis is horizontal between the lower end of the recess 14E and the arcuate recess 24F, and the center of curvature of the protrusion 24D connects to the lower end of the protrusion 24D. The roller 30 serving as a guiding means is used to support the photosensitive material P.
The windings are useful. The outer diameter of this roller 30 forms a part of the developing bath 28, which is a sized gap between it and the recess 14E of the main body 14, and its width is (R-L) to bend the photosensitive material. It is designed to guide you.

Further, a roller 32 having the same dimensions as the roller 30 is disposed in a substantially semi-cylindrical space formed between the flat part of the side plate 140 at the upper end of the notch part 14C and the semicircular arc part 24E. The winding of P is useful. This roller 32 is pivotally supported in a bearing groove 34 of a U-shaped guide 33 fixed to the end plate 14B of the main body 14 above the notch 14G. Side plate 14D at the upper end of notch 14G
The flat portion may have an arc shape similar to the arc portion 24F of the rack 24.

The upper end of the rack 24 is closed by a cover plate 36, and the interior thereof is hollow, and the temperature of this hollow portion can be controlled by supplying hot water or the like in the same manner as the temperature control tank 20.

A sleeve 38 passes through the cover plate 36, and its lower end is fixed to the semicircular arc portion 24E. The through hole of this sleeve 38 passes through the semi-circular arc portion 24E and passes through the developing bath 2 directly above the roller 32.
8, which serves as an air vent hole when filling the developing bath 28 with a developer.

A set screw 40 is screwed into the upper end of the sleeve 38 so that the sleeve 38 is closed after air is vented.

Pipes 42 and 44 communicate with the end plate 14B at portions corresponding to the insertion and exit portions of the photosensitive material P in the developing bath 28, and are connected to a developer supply pipe and a developer discharge pipe, respectively. A new developer is supplied to the developer bath 28 from this piping 42 provided near the liquid surface of the insertion portion of the photosensitive material P, and this developer moves with the movement of the photosensitive material P to the outlet of the photosensitive material P. The straw overflows from a pipe 44 provided near the liquid level of the tank and is discharged. In this case, the supplied developer does not come into contact with air within the developing bath 28 between the pipes 42 and 44, so the degree of air oxidation is extremely low.

Next, the operation of this embodiment will be explained.

The assembly is completed by inserting the main body 14 into the outer box 12 and fixing it with the bolts 18, and inserting the rack 24 into the main body 14, thereby forming an elongated slit-shaped developing bath space.

The rack 24 is fixed with the side plate 24A in contact with the inner periphery of the side plate 14D of the main body 14, but special means such as bolts may be provided for fixing the rack 24 to the main body 14. If the portion 24D is gradually tapered toward the tip, and the concave portion 14E of the main body 14 is also dimensioned to correspond to this, positioning of the side plate 24A and the side plate 140 when they come into contact can be ensured.

The developing solution is supplied by its own weight into the developing bath 28 from the piping 42, overflows from the piping 44, and is discharged. When the photosensitive material P is inserted into the developing bath 28, wound around the rollers 30 and 32 in sequence, and sent out, it is arranged in a straight line between the rollers 30 and 32 and advances within the slit-shaped developing bath 28. During this process, the main body 14. Since there is no contact with the rank 24, no scratches will occur due to contact.The photosensitive material taken out from the developing bath 28 is sent to the next process such as bleaching, fixing, and washing.

In this case, by making the moving speed of the photosensitive material P faster than the theoretical moving speed of the developer in the developing bath 28, uneven development can be eliminated and development sensitivity can be improved.

In this embodiment, in order to move the photosensitive material P in the developing bath 28, an elongated tape is connected to the tip and this tape is placed in the developing bath in advance.

A driving force is applied to the photosensitive material P by pulling the tape tip. In order to pass this tape into the developing bath 28, the rack 24 is inserted into the recess 14E of the main body 14, and at the same time the tape is inserted into the rack 24 and into the recess. The rollers 30.degree.

The hot water in the temperature control tank 20 maintains the developer in the developer bath 28 at a desired temperature, and since only a small amount of developer is used, the temperature can be adjusted easily and reliably.

In this embodiment, a roller for guiding the intermediate portion of the photosensitive material P passing in the vertical direction may be provided in the intermediate portion of the developing bath 28. In this case, a recessed portion for accommodating this roller may be provided in the main body. 14 or rack 24,
The developer in this area also does not come into contact with the atmosphere, so there is little air oxidation.

The developing solution in this embodiment is of a disposable type and is discarded after overflowing from the pipe 44. However, since the developing bath is narrow and the moving speed of the developer is slower than that of the photosensitive material P, the amount used is small, and since development can always be done with fresh developer, highly sensitive development is possible.

Next, FIG. 7 shows a developing device to which a second embodiment of the present invention is applied.

In this embodiment, an inner cylinder 52 is inserted into the rank 24, and the inside of this inner cylinder 52 serves as a bleach-fixing bath 54. This bleach-fixing bath 54 has a roller 56 inside thereof, and is adapted to bleach and fix the photosensitive material PI after being pulled out from the developing bath 28 and reversed by a roller 58 outside the bath.

Since the bleach-fixing bath 54 can be provided inside the curved passage of the developing bath 28 in this manner, the overall structure can be significantly miniaturized. Furthermore, a washing bath or the like may be provided within the bleach-fixing bath 54.

[Effects of the Invention] As explained above, the present invention provides a long and narrow developing bath from the inlet to the outlet of the photosensitive material to convey the photosensitive material, and the developer is supplied to the developing bath along the direction of conveyance of the photosensitive material. Since it is disposable and the photosensitive material is transported faster than the theoretical moving speed of the developer, it has an excellent effect of allowing highly sensitive development.

[Brief explanation of drawings]

1 is a cross-sectional view showing a photographic developing apparatus to which a first embodiment of the present invention is applied, FIG. 2 is a cross-sectional view taken along line H-II in FIG. 1, FIG. 3 is a cross-sectional view showing the main body, and FIG. The diagram is IV-rV in Figure 3.
Line sectional view, Fig. 5 is a sectional view showing the rack, Fig. 6 is a sectional view showing the rack.
FIG. 7 is a sectional view showing a photographic developing apparatus to which a second embodiment of the present invention is applied. 10...Photographic developing device, 12...φ outer box, 4φ...main body, 14B-・φ end plate. 140... Side plate, 24... Rack, 24A... Side plate, 24B... Body plate, 281... Developing bath.

Claims (2)

[Claims] (1) A long and narrow developing bath is provided from the inlet to the outlet of the photosensitive material to convey the photosensitive material, and the developer is supplied to the developing bath along the direction of conveyance of the photosensitive material to make it disposable, and the photosensitive material is A photographic development method that transports objects faster than the theoretical speed of transport. (2) The photographic developing method according to claim 1, wherein the developer is supplied from near the liquid level at the inlet of the photosensitive material in the developing bath and overflows from near the liquid level at the outlet of the photosensitive material.