JPH0812381B2 - Scanning exposure type camera for multi-sided mounting - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multiple-exposure scanning exposure type camera for exposing a document image on a photosensitive material such as master paper to create a printing plate or the like.

[Conventional technology]

As a copying camera for directly making a printing plate from an original, for example, an apparatus disclosed in Japanese Patent Application No. 63-15668 filed by the present applicant is known. The projection optical system of this camera is provided with a slit so that the slit-like image of the original document is projected onto the photosensitive material while the original document and the photosensitive material are traveling in synchronization with each other. , "Scanning exposure type camera".) The above scanning exposure type camera can change the copy magnification by adjusting the projection optical system.
It also has a function of creating a printing plate on which the same image is arranged by repeatedly exposing the image of the same document on the photosensitive material. In addition, arranging a plurality of images on one printing plate is referred to as “multiple imposition”.

[Problems to be Solved by the Invention]

By the way, there has been a demand for changing the copy magnification for each image when a printing plate is created by attaching the same document or different documents on multiple sides. For example, if you want to print two types of leaflets of different sizes on the same manuscript,
If a high-magnification image and a low-magnification image are attached to one printing plate in multiple planes, there is an advantage that only one printing plate is required and printing work can be omitted.

However, the conventional scanning exposure type camera has a problem that the copy magnification cannot be changed for each image to be multi-positioned.

Further, if the copy magnification is changed for each image to be subjected to multiple imposition, the processing of the area other than the effective photographing area including each image (hereinafter referred to as "non-effective area") is as follows. There is also the problem of difficulty. In a camera for making a printing plate as described above, a negative type photosensitive material is usually used. Here, the negative type sensitive material is
A photosensitive material in which the printing ink is applied to the non-exposed area and the printing ink is not applied to the exposed area. Usually, a printing plate created by the camera as described above is directly applied to a printing machine for printing. Therefore, it is necessary to uniformly expose the non-effective area to prevent the printing ink from being applied. By the way, when the copy magnification is changed for each image to be multi-laid, the size of the non-effective area also changes according to the copy magnification. Therefore, it is difficult to uniformly expose the non-effective area.

As a countermeasure against this, it is possible to use a method in which the pressure-bonding surface of the original cover is a white reflective surface and the size is such that the entire effective outside area of the photosensitive material is exposed at the time of shooting at the minimum magnification. If the above-mentioned effective non-effective area is large, the device becomes large.

[Object of the Invention]

The present invention has been made to solve the above-mentioned problems in the prior art, and provides a multiple exposure scanning exposure type camera capable of changing the copy magnification for each image when performing multiple exposure. This is the first purpose.

It is a second object of the present invention to provide a scanning exposure type camera for multi-sided printing, which can easily expose the non-effective area when the multi-sided printing is performed by changing the copy magnification for each image.

[Means for solving the problem]

In order to solve the above-mentioned problems, in the first configuration of the present invention, the multiple-sided scanning for copying a plurality of images on the sheet-shaped photosensitive material by synchronously transferring the original and the sheet-shaped photosensitive material. An exposure type camera comprising: (a) a document transfer means for holding the document and transferring the document in a predetermined document transfer direction; and (b) transferring the sheet-shaped photosensitive material in a predetermined photosensitive material transfer direction. Sensitive material transfer means, (c) for inputting respective copy magnifications of the plurality of images, and respective shooting lengths in the sensitive material transfer direction of a plurality of effective shooting regions including each of the plurality of images. And (d) a transfer length calculation means for calculating a required transfer length of the sheet-shaped photosensitive material for shooting the plurality of effective shooting regions based on the shooting length, (e) )
A projection optical system for projecting a slit-shaped image of the document onto the sheet-shaped photosensitive material; (f) each of the plurality of images,
By controlling the projection optical system to adjust the copy magnification, and controlling the document transfer means and the photosensitive material transfer means to be transferred in synchronization based on the photographing length and the transfer length, An imaging control unit for copying the plurality of images, each of which has its magnification independently controlled, is provided on the sheet-shaped light-sensitive material.

Further, in the second configuration of the present invention, in the scanning exposure type camera for multi-sided printing, (a) the photosensitive material transfer direction is used to expose the region of the sheet-shaped photosensitive material which is not exposed by the projection light from the projection optical system. An auxiliary exposure means having a plurality of light source elements arranged in a direction perpendicular to, and (b) a lighting position of the plurality of light source elements to be lighted corresponding to each of a plurality of effective photographing areas based on a copy magnification. Lighting control means for calculating the lighting width calculation means, and the shooting control means lights the plurality of light source elements in the auxiliary exposure means for each of the plurality of effective shooting areas based on the calculated lighting position. Control points.

[Action]

In the first configuration, the image capturing control unit adjusts the copy magnification of the projection optical system for each of a plurality of images, and simultaneously drives the document transfer unit and the photosensitive material transfer unit, so that the copy magnification of each image is increased. Can be changed easily.

Further, in the second configuration, the auxiliary exposure means having a plurality of light source elements is provided, and the lighting portion of the light source element is changed to light depending on the copy magnification. Therefore, even when the copy magnification is changed, the projection optical system is used. The effective outside area which is not exposed by the projection light from can be easily exposed.

〔Example〕

A. Schematic Configuration of Apparatus FIG. 1 is a side sectional view of a main part showing a slit exposure type copying camera to which an embodiment of the present invention is applied.

This copying camera includes an outer case 1, an original holder 2 provided on the outer case 1 so as to be able to run horizontally, a photosensitive material transport device 3 for transporting a sheet-like photosensitive material PM to an exposure position, A projection optical system 4 for irradiating light on the original held by the document and projecting light reflected by the original onto the photosensitive material PM, and a developing device 5 for developing and stabilizing the exposed photosensitive material PM And

The document holder 2 is a document table made of a transparent glass plate.
A document cover 21 and a document cover 22 are provided, and the document is pressed and held between the document table 21 and the document cover 22. The document holder 2 is driven in a horizontal direction (left and right directions in the figure) by a motor 23 provided in the outer case 1.

The light-sensitive material transport device 3 includes first and second light-sensitive material rolls 31 and 32, and a sheet-shaped light-sensitive material PM is sent out from one of them as needed. In the example of FIG. 1, the sensitive material PM is sequentially conveyed from the first sensitive material roll 31 by the three roller pairs 33 to 35. The exposure position is set between the two roller pairs 34 and 35. On the back side of the photosensitive material PM at the exposure position, a cutting device 36 for appropriately cutting the photosensitive material PM is provided. When the photosensitive material of the second photosensitive material roll 32 is used, the photosensitive material PM is sequentially conveyed by three roller pairs 37, 34, 35. The sensitive material conveying device 3
The configuration and operation of will be described in more detail later.

The projection optical system 4 includes a main light source 41 for irradiating the original document held in the original document holder 2 with light, mirrors 42 to 44 for reflecting projection light LB from the original document, and an image of the original document on the photosensitive material PM. The projection lens 45 for forming an image of the light and the slit 46 for limiting the width of the light LB projected on the sensitive material PM are provided. Further, an auxiliary light source 47 for uniformly exposing the peripheral portion (effective outside area) of the sensitive material PM that cannot be exposed by the projection light LB from the document is provided below the roller pair 35.

In this copying camera, the projection optical system 4 can be adjusted to change the projection magnification. The mirrors 43 and 44 are fixed to the same support plate 44a, and the support plate 44a is driven by a motor (not shown) and slides on the slide base 48. Further, the support 45a of the projection lens 45 is also driven by a motor (not shown) and slides on the slide 48. In this way, by moving the mirrors 43 and 44 and the projection lens 45 in parallel, the projection magnification can be changed.

When performing copying, first, the original document is set on the original document holder 2, and then the original document holder 2 and the photosensitive material PM are interlocked with each other while irradiating the original document with the main light source 41. That is, the document holder 2 is moved to the left side in the figure, and the sensitive material PM is sent downward by the roller pairs 33 to 35. Projection light LB from the original is mirror 42-44
Are sequentially reflected by, and after passing through the projection lens 45 and the slit 46, they are condensed on the photosensitive material PM. Since the photosensitive material PM is conveyed simultaneously with the movement of the document holder 2, slit images of the document are sequentially projected on the photosensitive material PM. When exposure is completed,
The sensitive material PM is cut by the cutting device 36, and the development processing device 5
Sent to

The exposed photosensitive material PM sent to the development processing device 5 is sequentially sent by a plurality of rollers, and undergoes development, fixing, and drying processes along a path indicated by a two-dot chain line in the figure. That is, the photosensitive material PM first passes through the developing tank 51 containing the developing solution, and then passes through the fixing tank 52 containing the fixing solution. Then, after passing through a drying section having a drying heater 53 and a fan 54,
It is carried out onto a tray 6 provided outside the outer box 1. The sensitive material PM thus developed, fixed and dried becomes a printing plate for offset printing.

FIG. 2 is a schematic side view showing a part of the photosensitive material conveying device 3 in an enlarged manner.

A one-way clutch (not shown) is pivotally mounted on the drive roller 34a of the roller pair 34, and an electromagnetic clutch (not shown) is pivotally mounted on the drive roller 35a of the roller pair 35. First, when the tip of the sensitive material PM is pinched by the roller pair 34, the sensitive material PM is sent downward by the roller pair 34. Then, when the tip of the sensitive material PM is pinched by the roller pair 35, the sensitive material PM is sent out by the roller pair 35.

Roller pair 35 has a higher transfer speed than roller pair 34
Send out. When the sensitive material PM is sent out by the roller pair 35, the one-way clutch of the roller pair 34 having a slow transfer speed runs idle. As a result, the photosensitive material PM is sent out at the transfer speed of the roller pair 35. At this time, the nip force (sandwiching force) of the roller pair 34 is not lost even if the one-way clutch idles.
It is transported while being tensioned between 4,35. As a result,
The sensitive material PM between the two roller pairs 34 and 35 is stretched by the tension without sagging, and the projection light LB from the original is projected on the sensitive material PM. The projection light projected on the sensitive material PM
The width of LB is approximately equal to the width W _{1 of the} slit 46.

The tip of the sensitive material PM is the processor roller pair of the development processing device 5.
When sandwiched by 55, the sensitive material PM is sent downward by the two roller pairs 35, 55. Since the transfer speed of the processor roller pair 55 is set lower than the transfer speed of the roller pair 35, the photosensitive material PM is sagged between the two roller pairs 35 and 55. When the exposure device is finished and the photosensitive material PM is cut by the cutting device 36, the roller pair 35 is stopped but the processor roller is stopped.
55 continues to move. However, since the sensitive material PM between the two roller pairs 35 and 55 has slack, the sensitive material PM at the cutting position is stopped until this slack is removed. Therefore, the sensitive material PM can be cut straight by cutting while the slack of the sensitive material PM is decreasing. The position at which the cutting device 36 cuts the sensitive material PM is almost at the center of the projection area of the projection light LB on the sensitive material PM. The cutting device 36 of FIG. 2 includes a cutter blade 36a and a blade fixing portion 36b.
And a blade guide 36c. The photosensitive material PM is cut while moving the cutter blade 36a along the blade guide 36c in a direction perpendicular to the plane of the drawing.

FIG. 3A is a front sectional view showing the structure of the auxiliary light source 47, FIG. 3B is its bottom view, and FIG. 3C is its right side view. Auxiliary light source 47
Is an LED 47a (light source element) arranged in a row at a constant pitch P, and a flare prevention member 47b provided below the LED 47a.
And have. The flare prevention member 47b is provided with a hole 47c at a portion below each LED 47a. As shown in FIG. 3B, the hole 47c has, for example, a rectangular shape having a length E and a width F. In a concrete example, the pitch P of the LED 47 is 1
The length E of the hole 47a may be about 7 mm and the width F may be about 2 mm.
Such flare prevention member 47c can be produced by machining or laminating a flat bar made of a light-shielding material. Gap between auxiliary light source 47 and sensitive material PM
(See FIG. 2) is set to about 2 to 3 mm, and a free roller 39 is arranged below the auxiliary light source 47 to stabilize the gap g. Hole compared to pitch P of LED47a
Although the length E of 47c is short, the light of the LEDs 47a projected on the sensitive material PM through the holes 47c does not overlap each other so much.
The PM is exposed uniformly. Further, since the width F of the hole 47c is made small, flare does not occur in the transfer direction of the sensitive material PM, and the projection light
There is an advantage that the boundary between the effective photographing area exposed by LB and the outside effective area exposed by the auxiliary light source 47 becomes clear.

The shape of the hole 47c may be oval, as shown in FIG. 3C. Further, as will be described later, only a few LEDs 47a may be turned on from both ends of the auxiliary light source 47 depending on the copy magnification. Therefore, only the hole 47c below the LED 47a, which may be turned on depending on the copy magnification, is shown in FIG.
Make a hole as shown in Figure C, and hole 4 for the other central LED 47a
7c may be circular. In this way, the flare prevention member 47
There is an advantage that b can be easily manufactured and the function of preventing flare is not lost.

FIG. 4 is a diagram showing an electrical configuration of the slit exposure type copying camera. In the figure, the control device of this copying camera is shown with a data input / display unit 71 and an input / output interface.
It includes a CPU 72, a CPU 73, and a power control unit 74.

The data input / display unit 71 includes a data input unit 71a and a data display unit 71b. The data input unit 71a is composed of a numeric keypad, etc.
Input various data described below from a. Further, the data display unit 71b displays data such as the position on the document holder 2 where the document should be set and notifies the operator.

The CPU 73 includes a document set position calculation unit 73a, an auxiliary light source lighting width calculation unit 73b, a sensitive material feed calculation unit 73c, and a photographing control unit 73d.
And an LED lighting data memory 73e. However, the functions of these elements 73a to 73e are realized by software provided to the CPU 73.

Here, the shooting position on the sensitive material PM and the data input section
Type of data to be input to 71a and each element 71a in CPU 73a
The functions of ~ 71e will be described.

FIG. 5 is a plan view showing a printing plate PP obtained by exposing the photosensitive material PM. This printing plate PP has a width D and is cut to a length L. Also, three images I _{1 to} I ₃ are copied on this printing plate PP. In the example of FIG. 5, the image
The copy magnifications of I ₁ , I ₂ , and I ₃ are set to 100%, 50%, and 70%, respectively. Areas RM _{1 to} RM ₃ indicated by coarsely shaded areas around the images I _{1 to} I ₃ are areas exposed by the projection light LB from the main light source 41 (hereinafter, referred to as “effective photographing area”). Show. The copy magnification of the image I ₁ is 100%, and in this case, the width of the effective photographing area PM is wider than the width D of the photosensitive material, as described later. The areas (indicated by fine diagonal lines) other than the images I _{1 to} I ₃ and the area RM are the effective outside area RN. This printed version
Since PP is used as a horizontal printing plate in a printing machine, it has a predetermined length B at one end in the direction perpendicular to the transfer direction.
The grip allowance is provided, and images I _{1 to} I ₃ are added to the grip allowance.
I am trying not to place.

When creating the printing plate PP as shown in FIG. 5, the operator inputs the following data to the data input unit 71a.

Indicating the length of the image I ₁ ~I ₃ of copy magnification M ₁ ~M ₃ length feeding photosensitive material width D added length B sensitive material L image I ₁ ~I respective effective imaging area RM ₁ ~RM ₃ of ₃ Shooting length C _{1 to} C ₃ Total shooting length TC = C ₁ + C ₂ + C ₃ The document set position calculation unit 73a in the CPU 73 is a copy magnification M ₁ to
Based on M ₃ , the photosensitive material width D, and the gripping length B, the document setting position data D 1 (see FIG. 6) is calculated. The document set position data D1 is data indicating the set position of the document on the document table 21.

FIG. 6 is a plan view showing a set state of the document OR on the document table 21. In this embodiment, as shown in FIG. 5, three images I _1-
I ₃ is supposed to be copied. The original document OR is placed on the original document table 21 made of a transparent glass plate with the original document surface facing downward. One end of a translucent (or transparent) positioning sheet 23 is fixed to the document table 21, and the operator covers the document OR with the positioning sheet 23. The positioning sheet 23 includes a center line CL, a left reference line LL, and a center line
A position display line DL indicating the distance from CL to both sides is drawn. Although FIG. 6 shows only part of the position display line DL for convenience of illustration, the position display line DL is actually drawn over the entire surface of the positioning sheet 23. FIG. 6 shows a state before the copying operation is started, and the left reference line LL is located on the right side of the exposure portion EP of the outer box 1 of the copying camera. The exposure part EP is a part where the main light source 41 and the mirror 42 shown in FIG. 1 are present. When copying, the document table 21 is exposed while moving to the left side in FIG.

The document set position data D1 indicates the distance between the center line CL and the lower end of the document OR, and is calculated by the following equation.

D1 = (D / 2−B) / M _max (1) where M _max is the copy magnification of the images I _{1 to} I ₃ to be copied with multiple imposition
It is the maximum value of M _{1 to} M ₃ .

The original set position data D1 is stored in the original set position calculator 73.
It is given to the data display part 71b from a through the imaging control part 73d and the input / output interface 72, and is displayed here.
The operator reads the displayed document setting position data D1 and sets the document OR on the document table 21. At this time, the left end of the original OR is aligned with the left reference line LL.

The auxiliary light source lighting width calculation unit 73b, based on the copying magnification M and the lighting data provided from the lighting data memory 73e,
The lighting width of the auxiliary light source 47 is determined. FIG. 5 shows the auxiliary light source 47.
It also shows the relationship between the sensitive material PM and the printing plate PP after exposure. The auxiliary light source 47 has a large number in the direction of the width D of the sensitive material PM.
It has a configuration in which LEDs 47a are linearly arranged. The auxiliary light source lighting width calculation unit 73b determines how many LEDs 47a required for exposing the non-effective area RN are turned on from the outside of the auxiliary light source 47.

FIG. 7 is a graph for determining the number of lit LEDs 47a. In the figure, the horizontal axis is the copy magnification M and the vertical axis is the sensitive material PM.
It is the width WL of the projection light LB projected on top. The projection light width WL is proportional to the copy magnification M (%) and is represented by the following equation.

WL = 5.3M (mm) (2) For example, when the copy magnification M is 100%, the projection light width WL is 530
mm. On the right side of the figure, the width on one side of the sensitive material PM that the projection light reaches is shown. However, in this figure, the photosensitive material width D is 42
The case of 0 mm is shown. In addition, the stepwise region in the drawing shows the relationship between the number N of lighting and the range of the copying magnification M corresponding to each number of lighting. For example, the copy magnification M is 75.4%
At this time, the projection light width WL is 400 mm. Since the width D of the sensitive material is 420 mm, if only one side of the sensitive material PM is considered, the projection light LB reaches only a portion 10 mm inside from the side end of the sensitive material PM. Therefore, when the copy magnification M is 75.4% or less, one LED 47a is turned on from each side of the auxiliary light source 47. However, here, the arrangement pitch of the LEDs 47a in the auxiliary light source 47 is set to 10 mm. The actual projected light width WL is the value shown by the broken line in FIG. 7, but in order to allow a sufficient amount of light to allow the auxiliary light source 47 to expose the effective outside area at the side end of the photosensitive material PM. , The projection light width WL shown by the solid line in the figure is used. According to the above idea, the number N of lighting is given by the following equation.

N = (400−5.3M) / (2 × 10) = 20−0.265M (3) However, the fractional part of N is rounded up to an integer, and when the value of N is negative, N = 0. In the lighting data memory 73e,
Data indicating the correspondence between the copy magnification M and the number of lighting N as shown in Table 1 below, which is determined by the equation (3), is stored.

Table 1 Copy magnification M (%) Number of lights on one side N 105 to 75.5 0 75.4 to 71.7 1 71.6 to 68.0 2 67.9 to 64.2 3 64.1 to 60.4 4 60.3 to 56.7 5 56.6 to 52.9 6 52.8 to 50.0 7 In the example of Fig. 4A. Copy magnifications M _{1 to} M _{3 of the three} images I _{1 to} I ₃
Are 100%, 50% and 70%, respectively. Each image I
Effective outside area RN on the side of _{1 to} I ₃ (top and bottom in the figure)
The number N of lights to be exposed for exposure is obtained by using the respective copy magnifications M _{1 to} M ₃ in the equation (3).

 In addition, generally, the number N of lighting is given by the following equation.

N = (D−2P−WL ₀ × M / 100) / 2P (4) Where, D: sensitive material width P: pitch of LED47a WL ₀ : projection light width when copy magnification M is 100% In Expression (4), the value of the maximum width of the photosensitive material that can be used in this copying camera may be used as the photosensitive material width D.

The lighting number N determined by the auxiliary light source lighting width calculation unit 73b is given to the photographing control unit 73d.

The sensitive material feed calculation unit 73c calculates the copy magnification M (M _{1 to} M ₃ ), the grip length B, the sensitive material feed length L, the shooting length C (C _{1 to} C ₃ ), and the total shooting length TC. Based on the roller pair 34,35, sensitive material PM
Decide how long to send. In the example of FIG. 5, the front end effective outer length A ₁ and the rear effective outer length A ₂ are calculated. The front end outside-effective exposure length A ₁ is a length in which only the photosensitive material PM should be sent in advance before the document holder 2 is started. When the original material holder 2 is started and exposed after the sensitive material PM is sent by the length A _{1 first} , the image I ₁ can be copied at the position shown in FIG. In the printing plate for horizontal printing, it is usual that the effective outer length A ₁ at the leading end and the effective outer length A ₂ at the rear are made equal to each other, and therefore these values can be obtained by the following equation.

A ₁ = A ₂ = (L / TC) / 2 (5) The sensitive material feed calculating unit 73c calculates the above-mentioned effective outer lengths A ₁ and A _2, and uses these values as the shooting lengths C _{1 to} C ₃ Along with the value of
Give to 73d.

The shooting control unit 73d is supplied with a shooting start signal S _e from the data input unit 71a, in addition to the data such as the number of lights N and the effective outer lengths A ₁ and A ₂ . Further, the origin signal S _o is output from the original origin sensor 25 provided at the lower part of the original holder 2 to the roller pair 35.
An encoder (not shown) of the drive motor 35m of (1) supplies a sensitive material feed pulse signal S _p . Based on these data and signals, the shooting control unit 73d gives commands to the optical system control unit 74a, the auxiliary light source control unit 74b, and the motor control unit 74c in the power control unit 74 to shoot the sensitive material. Control.

The optical system controller 74a controls on / off of the main light source 41 via the input / output interface 72, and adjusts the copy magnification of the projection optical system 4. Auxiliary light source controller 74
Reference numeral b controls the number N of auxiliary light sources 47 to be turned on and their on / off via the input / output interface 72. The motor control unit 74c, via the input / output interface 72, drives the drive motor 23 of the document holder 2, drive motors 34m, 35m, 55m of the roller pairs 34, 35, 55, and drive motor 36m of the cutting device 36, respectively.
It controls the operation with.

8A and 8B are flowcharts showing the procedure for creating the printing plate shown in FIG. 9A to 9L are explanatory views showing the exposed state of the photosensitive material PM in the procedure.

First, in step S1, the operator inputs the data input unit 71a.
Enter the required data in. The required data are the above-mentioned copying magnifications M _{1 to} M ₃ , the photosensitive material width D, the gripping length B, and the photosensitive material feed length.
L, shooting length C _{1 to} C ₃ , and total shooting length TC. Also,
At the same time, specify the mode indicating whether the printing plate to be created is for horizontal or vertical printing. At this time, the tip of the sensitive material PM is No. 9A.
As shown in the figure, the cutting device 36 is in the cutting position. In this embodiment, the cutting position and the center position of the projection light LB are the same. Hereinafter, this position is referred to as a "main exposure position".
The exposure position of the auxiliary light source 47 will be referred to as the "auxiliary light source position".

When creating a printing plate for horizontal printing, the document set position data D1 is calculated according to the above equation (1) and displayed on the data display unit 71b. The operator reads this data D1 and sets the document OR at the position shown in FIG. 6 in step S2.

In step S3, the operator inputs the data input unit 71a.
When the start key of is pressed, the operations after step S4 are started.

In step S4, the effective outer length is calculated according to the above equation (5).
A ₁ and A ₂ are calculated, and the feeding of the photosensitive material PM is started according to these values.

In step S5, it is determined whether or not the main exposure boundary line has come to the main exposure position. Here, the leftmost lines (indicated by the alternate long and short dash lines in the figure) of the photographing lengths C _{1 to} C ₃ in FIG. ₅ are called main exposure boundary lines ML _{1 to} ML ₃ . Further, the tip (the left end portion in FIG. 5) as the photosensitive material PM, the main exposure boundary lines ML _{1 to} ML ₃ and the right end line of the photographing length C ₃ are respectively defined as auxiliary exposure boundary lines SL ₁ to. S
Call it L ₅ .

As shown in FIG. 9B, when the photosensitive material PM is transported by the roller pair 35 by the effective outer length A _{1 of the} leading end portion, the first main exposure boundary line ML ₁ comes to the main exposure position. At this time, the roller pair 35 is stopped in step S6, the transfer of the sensitive material PM is stopped, and the main light source 41 is turned on in step S7. In addition, sensitive material PM
The transfer length is calculated by the imaging control unit 73d based on the sensitive material feed pulse signal S _p generated by an encoder (not shown) provided in the motor 35m of the roller pair 35 shown in FIG. The following steps S11, S16, S20, S22, and S31 are also determined based on the feed length of the roller pair 35.

FIG. 9B shows the exposure area EA exposed by the projection light LB from the main light source 41. The exposure area EA has a rectangular shape, and the length of the short side is equal to the slit width W ₁ and the length of the long side is equal to the projection light width WL shown in the equation (2). The main light source 41 may be turned on at a timing slightly earlier than the timing at which the photosensitive material PM is stopped in step S6.

Next, in step S8, the document holder 2 starts moving to the left from the standby position shown in FIG. In step S9, when the origin sensor 25 detects that the predetermined origin of the original in the original holder 2 has passed, the feeding of the sensitive material PM is started in step S10. At this time, the projection light LB at the position of the left reference line LL (see FIG. 6) of the document OR is projected at the main exposure position at the center of the exposure area EA. In this way, the photosensitive material PM and the original document OR are sent in synchronization with each other, whereby the image I ₁ is exposed on the photosensitive material PM.

Next, as shown in FIG. 9C, when the sensitive material PM is fed until the tip of the sensitive material PM (first auxiliary exposure boundary line SL ₁ ) reaches the auxiliary light source position, all the LEDs of the auxiliary light source 47 are turned on. To do. In this embodiment, the on / off of the auxiliary light source 47 is always controlled according to steps S31 to S35 shown in FIG. 8B. In steps S31 to S35, the auxiliary exposure boundary lines SL _{1 to} S
It is executed every time any one of L ₅ arrives, and only the required number of LEDs are lit from both ends of the auxiliary light source 47. The timing of turning on the auxiliary light source 47 may be slightly earlier than the timing at which the auxiliary exposure boundary line comes to the auxiliary light source position. When the feeding of the sensitive material PM is stopped while the auxiliary light source 47 is in the ON state (for example, step S6), the auxiliary light source 47 is also temporarily turned off and the feeding of the sensitive material PM is restarted (for example, step S10).
And the auxiliary light source 47 returns to the ON state. This is because flare is likely to occur if the auxiliary light source 47 is turned on while the photosensitive material PM is stopped, so that flare is prevented.

In this embodiment, the distance between the main exposure position and the auxiliary light source position
An example is shown in which W ₂ (see FIG. 9C) is longer than the effective outer length A _{1 of the} tip portion. Therefore, as shown in FIG. 9C, when the exposure of the non-effective area RN is started by the auxiliary light source 47, the main light source 41 has already exposed the image I ₁ and a part of the effective photographing area RM around it. . When the distance W ₂ is shorter than the effective outer length A _{1 of the} tip portion, exposure of the effective outer region RN by the auxiliary light source 41 starts first.

When the sensitive material PM is further transferred from the state shown in FIG. 9C,
As shown in the figure, the second auxiliary exposure boundary line SL ₂ comes to the auxiliary light source position. Therefore, steps S31 to S35 are executed.
However, copy magnification M ₁ of the image I ₁ is so 100%, the lighting number of the LED becomes zero, the auxiliary light source 47 is not actually turned. 9C and 9D show step S10 in FIG. 8A.
This occurs between (state of FIG. 9B) and step S11 described next.

In step S11, the shooting length C calculated from step S4
_When only _one sensitive material PM is sent, the document holder 2 is fed in step S12.
Is stopped, and the document holder 2 is returned to its standby position. Since copying of all the images I _{1 to} I ₃ has not been completed yet here, steps S13 to S14 are performed.
Then, the feeding of the sensitive material PM is stopped (Fig. 9E). In addition,
When the printing plate PP shown in FIG. 5 is produced, the auxiliary light source 47 has already been turned off before this step S14, so it is not turned off again here.

Step S15, the copy magnification M ₂ is the projection optical system 4 so as to obtain the next image I ₂ is adjusted. And step S7
The subsequent steps are executed again. FIG. 9F shows the state when the main light source 41 is turned on again in step S7. Second
Since the copy magnification M ₂ of the image I ₂ is 50%, the length of the exposure area EA
WL is shorter than the width of the sensitive material PM according to the above equation (2). Then, after step S10, the projection light LB having the length WL exposes the image I ₂ and the effective photographing area around it.

After the feeding of the sensitive material PM is restarted in step S10, as shown in FIG. 9G, when the sensitive material PM is fed to the position where the third auxiliary exposure boundary line SL ₃ comes to the auxiliary light source position, step S3 is performed again.
1 to S35 are executed, and the required number of LEDs of the auxiliary light source 47 are turned on from both ends. As a result, both ends of the photosensitive material PM that have not been exposed to the projection light LB are exposed.

Next, as shown in FIG. 9H, when the photosensitive material PM is fed until the _third main exposure boundary line ML ₃ comes to the main exposure position, step S11
~ S15 is executed and the copy magnification is changed. Then, step S7 and the subsequent steps are executed again.

Then, as shown in FIG. 9I, when the photographing of the total photographing length TC is completed, the process proceeds from step S13 to step S16.

In step S16, the photosensitive material PM is continuously fed until the total feed length from the state of step S4 becomes the feed length L input in step S1. However, during this period, as shown in FIG. 9J, the fourth auxiliary exposure boundary line SL ₄ comes to the auxiliary light source position, and therefore, steps S31 to S35 are executed at this time.

When the sensitive material PM has been fed by the feed length L, the feeding of the sensitive material PM is stopped in step S17. At this time, the auxiliary light source 47 is turned off. Then, in step S18, the sensitive material PM is cut by the cutting device 3
It is cut by 6 (Fig. 9K).

In step S19, the sensitive material PP that has been cut by the roller pair 35
Is restarted. At this time, the required number of LEDs on both ends of the auxiliary light source 47 are turned on again.

After that, as shown in FIG. 9L, when the auxiliary exposure boundary line SL ₅ comes to the auxiliary light source position, steps S31 to S35 are executed and all the LEDs are turned on. As a result, the effective outer region of the rear effective outer length A ₂ is exposed.

When the trailing end of the cut sensitive material PP is sent to the position of the roller pair 35 in step S20, the roller pair 35 stops in step S21. At this time, the auxiliary light source 47 is turned off. Even if roller pair 35 stops, processor roller pair 55
Keeps spinning. Then, the roller pair 35 shown in FIG.
The slack of the sensitive material between No. 55 and No. 55 gradually decreases.

When there is no slack in the photosensitive material in step S22, the auxiliary light source 47 is turned on again in step S23. The time t _l from the stop of the roller pair 35 in step S21 until the slack of the photosensitive material disappears in step S22 is expressed by the following equation.

t _l = (v ₃₅ t ₃₅ -v ₅₅ t ₅₅ ) / v ₅₅ + w ₃ / v ₃₅ -w ₃ / v ₅₅ (6) where v ₃₅ , v ₅₅ are transfer speeds of roller pair 35,55 , T ₃₅ , t
₅₅ is the cumulative operation time of the roller pair 35, ₅₅ from step S4 to S21 (the roller pair 55 continues to operate during this period), w ₃
Is the distance between roller pair 35 and 55.

The calculation of the time t _l is performed by the imaging control unit 73d.

After the roller pair 35 is stopped, if the processor roller pair 55 rotates for the above time t _l , the slack of the photosensitive material disappears.
The rear end portion of the cut sensitive material PP starts moving from the position of the roller pair 35 toward the processor roller pair 55. Therefore, step S2
The auxiliary light source 47 is turned on at 3 and exposure of the remaining portion of the rear effective length A ₂ is restarted. Then, in step S24, the cut sensitive material P
When the rear end portion of P passes the auxiliary light source position, the auxiliary light source 47 is turned off in step S25, and all exposure is completed. After that, by being processed by the development processing device 5,
The printing plate PP shown in FIG. 5 is completed.

As described above, in the above-described embodiment, it is easy to copy the plurality of images I _{1 to} I ₃ on one printing plate by arranging the originals OR on multiple sides, and moreover, to copy each of the images I _{1 to} I ₃ . There is an advantage that the copy magnifications M _{1 to} M ₃ can be set arbitrarily. Further, in this case, by calculating the lighting number of the LED in accordance with the copy magnification M ₁ ~M _3, since to expose the effective outer region RN lit only LED of the required number, the exposure of the effective outer area It has the advantage that it can be done easily.

Further, in the above-mentioned embodiment, the original document OR may be illuminated by the main light source 41 only when the respective effective photographing regions including the images I _{1 to} I ₃ are photographed, and the original document OR is exposed for exposing the non-effective region RN. Since there is no need to illuminate, there is also an advantage that the surface of the document can be prevented from becoming hot.

In the above embodiment, a plurality of images I ₁
~ I ₃ was supposed to be automatically multifaceted. But,
The respective originals of the plurality of images I _{1 to} I ₃ to be placed in multiple pages may be different from each other. In this case, step S15
At, the operator replaces the document in the document holder 2. Then, at this time, the document setting position D1 corresponding to each image may be displayed on the data display unit 71b.
It should be noted that the original setting position D1 at this time is not the maximum value M _max of the copying magnifications M _{1 to} M _{3 in} the above formula (1) but each image.
It is obtained by substituting the copy magnifications M _{1 to} M ₃ of I _{1 to} I ₃ . By doing this, unlike the arrangement of the images I _{1 to} I _{3 in} FIG. 5, the images are arranged so that the upper ends of the images I _{1 to} I ₃ are aligned at a position separated by the gripping length B from the upper end of the sensitive material PM. To be done. It should be noted that whether or not the operator replaces the original document or multi-faces from one original document may be designated in advance in step S1.

〔The invention's effect〕

As described above, according to the first configuration of the present invention, the photographing control means adjusts the copy magnification of the projection optical system for each of a plurality of images, and at the same time, synchronizes the document transfer means and the sensitive material transfer means. Since it is driven by the above method, there is an effect that the copy magnification can be easily changed for each image.

Further, according to the second configuration, since the auxiliary exposure means is provided and the lighting portion is turned on in accordance with the copy magnification, even when the copy magnification is changed, it is not exposed by the projection light from the projection optical system. There is an effect that the non-effective area as the photosensitive material portion can be easily exposed.

[Brief description of drawings]

FIG. 1 is a side sectional view showing an essential part of a copying camera according to an embodiment of the present invention, FIG. 2 is an essential part sectional view showing an enlarged part of a photosensitive material conveying device, and FIG. 3B is a bottom view of the auxiliary light source, FIG. 3C is a right side view thereof, FIG. 3D is a bottom view showing another example of the auxiliary light source, and FIG. FIG. 5 is a block diagram showing an electrical configuration of the copying camera, FIG. 5 is a plan view showing a printing plate on which an image is copied, FIG. 6 is a plan view showing a set state of a document on a document holder, and FIG. FIG. 8 is a diagram showing a graph for obtaining the lighting width of the auxiliary light source, FIGS. 8A and 8B are flowcharts showing a copying procedure in the embodiment, and FIGS. 9A to 9L are procedures of FIGS. 8A and 8B. FIG. 6 is an explanatory view showing an exposed state of the photosensitive material in FIG. OR: original, PM: sensitive material, 2 ... original holder, 3 ... sensitive material transport device, 4 ... projection optical system, 47 ... auxiliary light source, 71a
...... Data input unit, 73 ...... CPU, 73b …… Auxiliary light source lighting width calculation unit, 73c …… Sensitive material feed calculation unit, 73d …… Shooting control unit

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroyuki Tsujino 1 480 Takamiya-cho, Hikone City, Shiga Prefecture Dai Nippon Screen Mfg. Co., Ltd. Hikone District Business Office (56) Reference JP-A-1-189657 (JP, A) JP 62-118333 (JP, A)

Claims (2)

[Claims] 1. A scanning exposure type camera for copying a plurality of images on the sheet-shaped photosensitive material by transferring the original and the sheet-shaped photosensitive material in synchronism with each other. A document transfer means for holding and transferring the document in a predetermined document transfer direction; (1-b) a photosensitive material transfer means for transferring the sheet-shaped photosensitive material in a predetermined photosensitive material transfer direction; (1-c) An input unit for inputting a copying magnification of each of the plurality of images and a shooting length of each of the plurality of effective shooting regions including each of the plurality of images in the sensitive material transfer direction; ) A transfer length calculating means for calculating a required transfer length of the sheet-like photosensitive material for shooting the plurality of effective shooting regions based on the shooting length, and (1-e) a slit of the document. An image on the sheet-shaped photosensitive material A projection optical system; (1-f) controlling the projection optical system for each of the plurality of images to adjust the copy magnification, and based on the photographing length and the transfer length, the document transfer means and the sense. By controlling the material transfer means to transfer the material in synchronism,
A scanning exposure type camera for multi-sided printing, comprising: a photographing control unit that copies the plurality of images each of which has its magnification independently controlled on the sheet-shaped light-sensitive material. 2. The scanning exposure type camera for multi-sided printing according to claim 1, wherein (2-a) a photosensitive material transfer direction for exposing a region of the sheet-shaped photosensitive material which is not exposed by projection light from the projection optical system. An auxiliary exposure unit having a plurality of light source elements arranged in a direction orthogonal to, and (2-b) a plurality of light source elements to be lit corresponding to each of a plurality of effective photographing areas based on a copy magnification. A lighting width calculation means for calculating a lighting portion is provided, and (2-c) the photographing control means, in the auxiliary exposure means, for each of the plurality of effective photographing areas based on the calculated lighting portion. A scanning exposure type camera for multi-sided mounting, which controls lighting points of the plurality of light source elements.