JPH0244285Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a photosensitive material printing apparatus.

Generally, in photosensitive material printing equipment, originals and photosensitive materials are stacked and positioned on a stage glass, covered with an adhesive rubber sheet, and brought into close contact with the stage glass using a decompression mechanism, etc. By irradiating light from the light source device, the original image is printed onto the photosensitive material.

One type of photosensitive material printing apparatus is a light source traveling type in which a light source device having a long and narrow light projection aperture is moved relative to the stage glass in a direction perpendicular to the light projection aperture to perform scanning exposure. This method is widely used for printing large-area photosensitive materials because it can irradiate light with a uniform illuminance distribution at least in the traveling direction. However, even in this light source traveling type photosensitive material printing device,
The degree of scattering or parallelism of the emitted light is usually different between the traveling direction of the light source device and the direction perpendicular to it, so the image information due to the light reaching the photosensitive material may be distorted relative to the original image. Become something. In order to improve this problem, conventionally, a suitable hollow lattice body has been provided at the light projection aperture of the light source device.

A typical hollow lattice body is shown in Figure 1. This hollow lattice body F has a honeycomb shape in which regular hexagonal cylinders with a side length and height h are connected two-dimensionally, and the optical properties of this hollow lattice body are as follows. As shown in FIG. 2, it is basically determined by the width w and height h of the hollow part, which are determined corresponding to the length of one side of the hollow lattice body F, and the printing light that is transmitted depends on the size of these. The size of the minimum angle θ of L,
That is, as shown in FIG. 3, the magnitude of the minimum incident angle θ with respect to the stage glass 1 changes. And the width lol
As the width w becomes smaller or the height h becomes larger, the minimum incident angle θ becomes larger and the parallelism of the transmitted light becomes higher. Conversely, as the width w becomes larger or the height h becomes smaller, the minimum incidence angle θ becomes smaller. As a result, the degree of scattering of transmitted light increases. Furthermore, the quality of the transmitted baking light changes depending on whether the inner surface of the hollow lattice is light reflective or light absorbing. The degree of scattering increases.

In any case, by using the hollow lattice body as described above, it is possible to make the scattering degree or parallelism of the light irradiated onto the stage glass uniform, but in actual photosensitive material printing work, Printing with light having a required degree of scattering is required depending on the photosensitive characteristics of the photosensitive material used, the intended content of printing, and other conditions. This is because the degree of scattering of the printing light has an important relationship with the printing result.
As shown in the figure, for example, three light-transmissive originals A, B, and C are placed one on top of the other on the photosensitive material PS, and the printed image areas da, corresponding to the image areas a, b, and c are printed.
When printing the photosensitive material PS so that db, dc are formed, if a highly parallel printing light L is used as the printing light L as shown in Figure A, the image areas da, db of the printed photosensitive material PS are , dc are manuscripts A, B,
Image portions a, b, and c of C are faithfully reproduced. On the other hand, when scattered light is used as the photosensitive material L as shown in FIG.
The widths of the image areas da, db, and dc of the PS vary depending on the distance of the originals A, B, and C from the photosensitive material PS, and the image area a of the original A that is brought into close contact with the photosensitive material PS is faithful. However, the widths of the image areas db and dc of the photosensitive material PS corresponding to the image areas b and c of the originals B and C become smaller in this order.

In this way, the degree of scattering or parallelism of the printing light L has an important relationship with the printing result, and in particular, there are cases where printing using printing light having different degrees of scattering is required in a series of printing operations. For example, in the production of so-called bag letter printing plates, as shown in FIG. A negative image with an image width X larger than the width x is formed on a first photosensitive material PS1, and then, using this first photosensitive material PS1 as a printing original, a negative image is formed on a second photosensitive material PS2 as shown in FIG. After that, the original OR is brought into close contact with the second photosensitive material PS2 instead of the first photosensitive material PS1, and the second printing is performed using parallel light, as shown in Figure C. A series of operations are performed to form a hollow-shaped printed image having an outer width of X and an inner width of x on the second photosensitive material PS2.

Conventionally, when printing light with a different degree of scattering or parallelism is required for each repeated printing operation, when the photosensitive material printing apparatus used is a normal type having a light source device consisting of a point light source. Until the entire series of operations is completed, the positional relationship of the stack of originals and photosensitive material with respect to the light source must be completely fixed, but in the printing process using scattered light, the original and photosensitive material It is necessary to insert a light diffusing plate between the stacked body and the stage glass, and to remove it when printing with parallel light, which requires positioning with extremely high precision. This method has drawbacks such as extremely low work efficiency and difficulty in precisely matching the baking conditions, making it extremely difficult to obtain good baking results. be.

The present invention was developed based on the above-mentioned circumstances, and its purpose is to provide a photosensitive material printing apparatus that can arbitrarily switch between different degrees of scattering or parallelism as printing light. It is about providing.

An embodiment of the present invention will be described below with reference to the drawings.

In one embodiment of the present invention, as shown in FIG. 6, a light source device 3 is provided in a device outer case 2 to which a stage glass 1 is fixed on the top surface so as to move along the bottom surface of the stage glass 1. That is, for example, the rail 10 is disposed so as to extend parallel to the lateral direction of the stage glass 1, and the light source device 3 is provided with the rail 10.
A belt 11 that is driven to move along a rail 10 is connected to a light source device 3 with wheels 4 running thereon.
Connect to. The belt 11 is suspended between pulleys 12, 12 and can be moved in the forward or reverse direction by a drive motor 13.

In the light source device 3, as shown in FIG. shall have a length that matches that of the Light source lamp 2 here
3 may consist of a rod-shaped lamp,
Alternatively, it may be composed of a plurality of lamps arranged in line along the light projection opening 21.

A holding frame 30 is provided above the light source device 3. This holding frame 30 includes a plurality of hollow lattice holding portions 3 lined up along the direction in which the rail 10 extends.
0A and 30B are provided, and this hollow lattice body holding part 30
Hollow lattice bodies FA and FB having different optical properties are arranged and held in each of A and 30B in a detachable manner. As shown in FIGS. 8 and 9, this holding frame 30 includes a supporting leg plate 31 extending in the running direction of the light source device 3, which is provided so as to protrude from both sides of the holding frame 30, and this supporting leg plate 31. It has a rack 33 provided on the lower surface of one of the guide plates 32 extending in parallel, and is supported by a holding frame support mechanism provided in the light source device 3. The holding frame support mechanism in the illustrated example includes support plates 40 fixed to both side surfaces of the box body 22, and rotatable supports are provided on the inner surface of each support plate 40 at positions spaced apart from each other in the running direction. Wheels 41, 41 are provided, and the supporting leg plate 31 of the holding frame 30 is positioned on the supporting wheels 41, 41, so that the holding frame 30 is movably supported and passes through one of the supporting plates 40. A gear 46 provided at the inner end of the shaft 45 meshes with the rack 33, and a switching rotary knob 47 is attached to the outer end of the shaft 45. Therefore, by rotating the switching rotary knob 47, the holding frame 30 is moved in the same direction as the moving direction of the light source device 3 via the gear 46 and the rack 33. Further, the switching rotary knob 47 is set to a first rotational position in which the first hollow lattice body FA is located at the first position located above the light projection port 21 of the box body 22, and a second hollow lattice body FB is at the first position where the first hollow lattice body FA is located on the light projection opening 21 of the box body 22. It has a stopper mechanism (not shown) so as to stably stop at each of the second rotational positions located above the light projection openings 21 of 22.

In the apparatus configured as above, the original and the photosensitive material are placed one on top of the other on the stage glass 1, and brought into close contact with each other by the action of an adhesive rubber sheet and a pressure reduction mechanism (not shown), and in this state, the drive motor 13 is driven. and then connect the light source device 3 to the rail 10 via the belt 11.
By running and moving the light source device 3
The printing of the photosensitive material can be accomplished by scanning the strip-shaped printing light.

In the light source device 3, a plurality of hollow lattice bodies FA and FB are arranged in the holding frame 30, and by rotating the switching rotary knob 47 and moving the holding frame 30, the first or the second position, any one of the hollow lattice bodies FA and FB can be positioned above the light projection aperture 21.
Therefore, even though the same device is used, it is possible to select a desired type of printing light from among a plurality of scattering degrees or parallelisms and use it to print the photosensitive material. This is extremely useful when printing with a high degree of scattering is required.

Further, in the above embodiment, since the moving direction of the holding frame 30 is the same as the moving direction of the light source device 3, the width of the light projection opening 21 is small, so the holding frame 30
The moving distance for switching 0 can be shortened, and the structure of the holding frame support mechanism can therefore be simplified.

In an actual device to which the present invention is applied, a device is required to set the moving speed of the light source device 3, and this depends on the photosensitive characteristics of the photosensitive material and other conditions. This is to obtain an appropriate moving speed in relation to the above. Further, it is convenient to provide a mechanism for modifying the set moving speed of the light source device 3 according to the optical characteristics of the selected hollow lattice body actually used.

It is also preferable to provide a mechanism for displaying what characteristic of the hollow lattice body is selected, or a mechanism for displaying whether the selected hollow lattice body is accurately positioned over the light projection aperture.

Although the above description has focused on one embodiment of the present invention, various modifications can be made to the present invention. For example, the number of holding parts for the hollow lattice body in the holding frame may be three or more, and the optical properties may be mutually changed between them. Different hollow lattices can be arranged and used selectively. Further, the movement method, switching method, switching mechanism, etc. of the holding frame in the light source device 3 may be of other types. Further, the present invention is not limited to the light source traveling type, but can also be applied to a stage glass moving type in which the light source device is fixed and the stage glass is moved.

As described above, the present invention has an extremely simple structure, and is equipped with hollow lattices with different optical properties, and any one of them can be switched and used, making it extremely convenient and efficient in actual photosensitive material printing work. This can be greatly improved, and since there is no need to adjust the baking conditions, etc., good baking can always be achieved.

[Brief explanation of the drawing]

Figures 1 and 2 are a perspective view of the hollow lattice body and an explanatory diagram of optical characteristics, respectively. Figure 3 is an explanatory diagram of the incident angle of the printing light on the stage glass. Figure 4 A and B are parallelism or scattering. An explanatory diagram of the difference in the effects of printing light of different degrees of printing, an explanatory diagram of the baking process for producing the printing plate for printed letters shown in Figure 5 A to C, and Figure 6 is an explanatory diagram of the photosensitive material printing apparatus of the present invention. A vertical cross-sectional front view showing the overall configuration of one embodiment, FIG. 7 is an explanatory cross-sectional view of the light source device,
8 and 9 are a longitudinal sectional front view and a longitudinal sectional side view, respectively, of essential parts of the holding frame support mechanism. F...Hollow lattice body, A, B, C...Manuscript, PS,
PSI, PS2...Photosensitive material, OR...Original, S...Spacer, L...Printing light, 1...Stage glass,
2... device outer box, 3... light source device, 4... wheels,
10...Rail, 11...Belt, 12...Pulley, 13...Drive motor, 21...Light projection port, 2
2...Box body, 23...Light source lamp, 24...Reflector, 30...Holding frame, FA, FB...Hollow lattice body,
31... Support leg plate, 32... Guide plate, 33... Rack, 40... Support plate, 41... Support vehicle, 45...
...shaft, 46...gear, 47...rotary knob for switching.

Claims (1)

[Scope of utility model registration request] In a photosensitive material printing apparatus, in which a stage glass on which originals and photosensitive materials are stacked and positioned and a light source device that irradiates printing light through the stage glass are moved relatively to perform printing of the photosensitive material, A photosensitive material printing apparatus characterized in that the light source device comprises a plurality of hollow gratings having mutually different optical characteristics, which are selectively positioned on the light projection aperture of the light source device.