JPS62234464A - Picture scan reader/recorder - Google Patents

Abstract

PURPOSE:To always record a picture having 2 different screen angles on a film with no positional deviation by scanning the 1st light beam in the main scanning direction to read the picture information on an original document, processing the obtained picture signals to modulate the 2nd light beam for picture recording and projecting the modulated beam on a photosensitive material as dot signals. CONSTITUTION:The laser beam L is secanned over a film F through a gap part formed between nip rollers 88 and 90. The end of the 1st picture recording is detected after the continuous scan of the light L and when a photodetecting means 41 reads the bar code sattached to a mobile plate 200, for example. Then a laser beam source 52 is driven again at an angle deflected by 30 deg. from the screen angle at which the 1st picture is carried out. Thus the 2nd picture scan is started. In other words, a motor 84 is driven toward an arrow head C and the rollers 88 and 90 are pressed against a rotary drum 82 for feed of the film F. Thus the picture recording is carried out.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an image scanning reading/recording device, and more particularly,
The present invention relates to an image scanning reading/recording device for recording characters, images, etc. while holding and conveying a record carrier made of a photosensitive material such as a film on a rotating drum.

In recent years, image scanning reading and recording devices have been adopted in the fields of printing and plate making to create film originals by reading image information drawn on manuscripts and electrically processing them to streamline work processes and improve image quality. It has come to be.

This image scanning reading/recording device basically consists of an input section, a control section, and an output section.

That is, in the input section, a reflective photo original or line drawing original is scanned with a light beam and detected by a photomultiplier, or a COD (charge c, oupl)
(ed device) A camera reads the image and converts the image information of the document into an electrical signal according to the strength of the reflected light.

Next, the image information photoelectrically converted by the input section is subjected to arithmetic processing in the control section to perform gradation correction, halftone separation, etc. according to the plate-making conditions. The image information processed by the control section is converted into an optical signal made of laser light at the output section, and the laser light is irradiated onto a record carrier made of a photosensitive material to record a desired image. Furthermore, the recording carrier after the image recording is completed is subjected to a development process, and is finally used for printing or the like as a film original plate.

Therefore, in view of the above configuration, it is desirable that this type of image scanning reading/recording device be adopted and popularized not only in the field of color printing but also in the field of monochrome printing.

In view of these points, the applicant has developed a single-color scanner that improves work efficiency and improves image quality all at once.

The outline has already been published in the journal of the Institute of Image Electronics Engineers, etc.

However, when using the above-mentioned image scanning reading/recording device to express a continuous tone original with a monochromatic halftone image, it may be necessary to create two kinds of halftone films with different screen angles. be. This has the effect of making moire fringes less noticeable during plate making, and
This is because this has the advantage of producing a solid finish that is close to the original original, and enabling high-quality printing.

Therefore, in an image scanning reading/recording device, when trying to make two types of mesh films with different screen angles as described above, an image recording carrier such as a film is sandwiched and conveyed between an image recording drum and a nip roller. During transportation, a first mesh film is formed at a predetermined screen angle, and then a second mesh film is formed at a different screen angle. During printing, these two types of mesh films are used to overlap each other twice. Therefore, in order to print overlappingly using two types of mesh films with the same image, it is inevitable that the respective images of the two rope films must always match when they are overlaid. It's coming.

However, as mentioned above, when trying to transport film using an image recording drum, if there are manufacturing errors in the drum and the roundness is not sufficiently ensured, the repeatability accuracy will deteriorate. As a result, an unacceptable positional shift occurs between the recorded images of the two types of mesh films. In other words, when trying to make two types of mesh films for the same image by changing the screen angle, if the scanning start positions for recording the image by halftone dots are different on the image recording drum, the drum may not be perfectly round. , a slight difference appears in the transport distance of the film, etc., and when the recorded images of the two types of mesh films obtained are superimposed, considerable image positional deviation will occur.

Therefore, it has been pointed out that there is a drawback that a mesh film of excellent quality cannot be obtained.

The present invention has been made in order to overcome the above-mentioned disadvantages, and includes a recording drum that transports the film, which is provided with a rotational position detecting means for the drum, and which works together with the drum to transport the film. The image recording drum is rotated idle with the nip roller separated from the image recording drum, and the image recording start position on the image recording drum is detected by a device detection signal constituted by a position detection means. is controlled so that it remains constant,
This provides an image scanning reading/recording device that can always record images at two or more different screen angles on a film without positional deviation even if there are manufacturing errors in the sheet metal or the image recording drum. The purpose is to

In order to achieve the above object, the present invention conveys an original in the sub-scanning direction and scans the original with a first light beam in the main scanning direction to read the image information of the original. In an image scanning reading/recording apparatus that performs signal processing on the obtained image signal, modulates a second light beam for image recording, and irradiates the photosensitive material as a mesh signal to record an image, the second light beam Position detecting means is disposed on a rotating drum that conveys the photosensitive material in a sub-scanning direction with respect to the main scanning direction of the beam, and the rotating drum is rotated with reference to a predetermined position of the rotating drum detected by the position detecting means. Then, the rotating drum is rotated and the screen angle is adjusted again from the predetermined position under the rotational action of the rotating drum. The present invention is characterized in that an image is recorded on the photosensitive material using a second mesh signal different from the second mesh signal.

Therefore, with this configuration, even if there is a manufacturing error in the rotating drum, images with different screen angles recorded at the same position on the rotating drum can be obtained, so when these images are overlapped, the corresponding The effect is that no positional shift occurs between images.

Next, preferred embodiments of the image scanning reading/recording apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

1 and 2, reference numeral 10 indicates an image scanning reading/recording device according to the present invention, and the image scanning reading/recording device 10 basically includes an input section 12, a control section 14, and an output section 16. include. The document table 18 constituting the input section 12 has an endless conveyor belt 20 and a digitizer 22.
A document paper transport system 24 is provided at one end of the transport belt 20. In fact, the manuscript paper transport system 24
are rollers 26a arranged in parallel and oriented in the horizontal direction;
26b, 26c and 26d, including rollers 26b and 2
A driving roller 28 is disposed between the roller 6C and the roller 6C. A nip roller 30 is provided above the drive roller 28, and the second and seventh rollers 3o are rotatably held by a bending arm 32. The arm 32 has a fulcrum 34 at its bent portion, and a coil spring 36 is connected to one end thereof. Therefore, the arm 32 functions to press the nip roller 30 toward the drive roller 28 with the fulcrum 34 as the center due to the tensile force of the coil spring 36.

Note that a light detection means 41 consisting of a light emitting section 38 and a light receiving section 40 is disposed between the driving roller 28 and the roller 26c, and a moving plate 200 described later is arranged between the rollers 26a to 26d.
Furthermore, when the sheet is conveyed by the driving roller 28 and the nip roller 30, the passage thereof is detected. On one side of the roller 26d, there is a roller 26 from the document placement table 18.
A document receiving stand 42 is provided for receiving the movable plate 200 conveyed via a to 26d.

An image reading system 5 is installed above the transport system 24 configured as described above.
0 is set. The image reading system 5o includes a laser light source 52, and a light modulator 54, a galvanometer mirror 56, a scanning lens 58, and a half mirror 6o are arranged on the laser light output side of the laser light source 52. Furthermore, a light guide 6 made of a light guiding sheet is placed along the main scanning line at the scanning position of the laser beam emitted from the laser light source 52 on the document.
2 is disposed, and an image sensor, for example, a photomultiplier 64, is mounted above the light guide 62.

Furthermore, the laser light passing through the half mirror 60 reaches the output section 16.

Next, as shown in FIG. 1, a photosensitive material supply magazine 66 constituting the output unit 16 is attached to the upper part of the housing constituting the apparatus 10, and inside the magazine 66 there is a long A photosensitive material such as film F is loaded. A roller 68 for taking out the film F is disposed substantially near the magazine 66, and a pair of rollers 70 is disposed slightly below the roller 68 and using a corner of the casing of the device 10. ing. A guide roller 72 is further rotatably disposed below the roller pair 70, and a loop detector 74 includes a light emitter 75a and a light receiver 75b for detecting the film F hanging down in a loop shape.
will be placed. Furthermore, guide rollers 76 and 78 are disposed above the loop detector 74. A meandering amount detector 80 is provided between the guide rollers 76 and 78 to detect the amount of meandering of the film F.

A rotating drum 82 is provided below the guide roller 78, and the rotating drum 82 is rotatable by a belt 87 and a pulley 86 that is pivotally supported by the rotating shaft of an image recording motor 84. Note that a nip roller 88.90 is provided opposite to the rotating drum 82, and the nip roller 88.90 can be moved away from or close to the rotating drum 82 by a solenoid 92.94. Rotating drum 8
2 and a pair of cutters 9 below the nip roller 90.
63, 96b are arranged, and these cutters 96a, 9
Guide members 93a and 98b are provided below 6b.

The tips of the guide members 98a and 98b face an opening 100a of a photosensitive material receive magazine 100, and a pair of rollers 102 and a curved guide plate member 104 are provided below the opening 100a. Of course, this receive magazine 100 can be easily taken out from the device 10.

Therefore, in the above-described configuration, in the apparatus of the present invention, the dog 1 bent on the rotary drive shaft 106 of the rotary drum 82 is
08 are connected, and the tip of this dog 108 faces the photoelectric detection element 110. The photoelectric detection element 110 is fixed inside a casing constituting the device 10 via an arm 112 (see FIG. 3).

Next, a control circuit for driving the rotating drum 82 and nip rollers 88 and 90 of the image scanning reading/recording apparatus constructed as described above will be explained with reference to FIG.

The drive signal for the motor 84 is branched and introduced into the set terminal of the first flip-flop 150, while the drive signal for the motor 8
A rotation stop signal of 4 is introduced to the reset terminal. The first flip-flop 150 has its Q output terminal connected to one input terminal of an AND gate 152, and the other input terminal of the antagonal gate 52 has a photoelectric detection element 110 connected thereto.
The output signal is introduced to open this gate. The output signal of the AND gate 152 is sent to the set terminal of the second flip-flop 154, while the reset terminal is sent to the set terminal of the second flip-flop 154, which is detected by the light detection means 41 consisting of the light emitting section 38 and the light receiving section 40. The configuration is such that a signal representing . The output signal of the second flipflop 154 is introduced into a drive circuit 156 for the solenoid 92 (94).

The image scanning reading/recording apparatus according to the present invention is basically constructed as described above, and its operation will be explained below.

First, the movable plate 200 is placed on the mounting table 18, and the image reading range of the original such as a color photograph attached to the movable plate 200 is set using the digitizer 22 and a cursor (not shown). Next, the conveyor belt 20 is driven, and!
3! The moving plate 200 on the device 18 is transported in the direction of arrow A and faces the transport system 24 . In the conveyance system 24, the driving roller 28 is rotationally driven by driving a stepping motor (not shown).
a, 26b, drive roller 28, and rollers 26c, 26d to convey in the direction of arrow A. During this time,
The nip roller 30 continues to convey the light guide 62 while nipping the moving plate 200 in cooperation with the drive roller 28 .

The light emitting section 38 and the light receiving section 40, which are the light detection means 41, detect the arrival of the moving plate 200 at a predetermined position and send the signal to the control section 14, and the control section 14 sends a drive signal to the output section 16. do. That is, although not shown, a start mark provided on the moving plate 200 is aligned with the light emitting section 38 and the light receiving section 4.
0, the detection means sends a signal to the control unit 14 indicating that the document attached to the movable plate 200 has reached the image reading position, and thereby the output unit 16 as described above.
will be driven. The drive of the output section 16 substantially transports the film F from the supply magazine 66 to the receive magazine 100 side. That is, the film F supplied from the magazine 66 reaches the rotating drum 82 via the roller 68, the roller pair 70, the guide rollers 72) and the guide rollers 76 and 78. During this time, the loop detector 74 is activated by a light emitter 75 that emits a light beam in a wavelength range to which the film F is not sensitive.
a and a light receiver 75b, which detects when a predetermined amount of loop is formed by the film F. On the other hand, the meandering amount detector 80 includes a light emitter and a light receiver that emit a light beam in a wavelength range that does not expose the film F at a position outside the meandering tolerance range on both sides of the film F during transport. The device controls the feeding operation of the film by issuing a meandering signal when the film meanderes beyond a permissible amount.

Next, the output section 16 drives the motor 84. That is,
The drive start signal for the motor 84 starts rotation of the motor 84 and is also introduced as a cent signal to the set terminal of the first flip-flop 150, so that the flip-flop 150 is set. The flip-flop 150
When set, the output signal from the Q output terminal is introduced into AND gate 152. The rotation of the motor 84 rotates the dog 108, and this dog 108
I will be facing the 10th. So, this AND gate 15
When the output signal of the photoelectric detection element 110 is introduced into the gate 2, the gate is opened. This causes the second flip-flop 1
54 is set and the drive circuit 156 of the solenoid 92 (94) is energized to force the nip rollers 88, 90 against the rotating drum 82.

Therefore, the film F is in a conveyed state for the first time here. After all, the position where the photoelectric detection element 110 is disposed opposite to the dog 10B is the rotation start position of the rotary drum 82.

Therefore, when the solenoid 92 (94) is driven as described above, the nip rollers 88, 90 move toward the rotating drum 82.
press against. As a result, the film F is transferred to the rotating drum 8.
2 and nip rollers 88 and 90.

In this state, the laser light emitted from the laser light source 52 passes through the optical modulator 54, then swings under the action of the galvanometer mirror 56, passes through the scanning lens 56, and reaches the half mirror 60. do. The light beam reflected and deflected by this half mirror 60 is reflected by the moving plate 20.
0 is scanned onto an unillustrated original document. The reflected light from the original enters the light guide 62 and then passes through the photo multiplier 6.
4, this signal is converted into an electrical signal by the control unit 1.
4, and gradation correction etc. are performed according to the plate-making situation.

Based on the gradation correction by the control section 14, the output section 16 records an image on the film F. That is, the drive motor 84 rotates the image recording rotary drum 82 in the direction of arrow C at a predetermined speed, while the nip rollers 88 and 9
Laser light is scanned onto the film F from the gap defined by the . After the laser light scan continues in this way, the first image recording ends, for example.
The light detection means 41 reads and detects a barcode (not shown) attached to the moving plate 200. This signal is the second
Reset flip-flop 154. This de-energizes the solenoid 92 (94). Here, the drive roller 28 is driven in reverse.

As a result, the movable plate 200 is moved in the direction opposite to the direction of arrow A and returns to its original position. During this time, motor 84 continues its rotation. Therefore, when the photoelectric detection element 110 detects the presence of the dog 108 again, the flip-flop 15
0 is set, which causes the nip roller 88.9
0 is in a state where it is in pressure contact with the rotating drum 82 again. Note that in this way, the dog 108 is connected to the photoelectric detection element 110.
Returning to the position again means that the rotating drum 82 has finally returned to its original position.

Therefore, the laser beam is2 is driven again at an angle deviated by 30 degrees from the screen angle used for the first image recording, and the second image scanning is started. That is,
The motor 84 is driven to rotate in the direction of arrow C, and the nip rollers 88 and 90 come into pressure contact with the rotating drum 82 again, and the film F is fed and image recording is performed.

The film F, which has been covered with the net twice at different screen angles in this manner, is cut by the force so that the cutter 96a and the cutter 96b move closer to each other, and the film F is cut by the force, and the film is transferred to the receive magazine 100 via the guide members 98a and 98b.
stored inside.

In the receive magazine 100, the film F formed in duotone in this manner is taken out as necessary and is subjected to photolithography.

According to the present invention, when forming a net film by recording images at different screen angles as described above, the image recording start position is always kept constant. Therefore,
For example, when the same image is recorded multiple times with different screen angles as described above, it is possible to prevent positional deviation between the resulting images. For this reason, even if manufacturing errors occur in the rotating drum itself used for image recording, it is possible to sufficiently absorb these errors and form a mesh film that does not cause printing misalignment even when printed in layers. is obtained.

Although the present invention has been described above with reference to preferred embodiments, the present invention is not limited to these embodiments.
For example, the same effect can be obtained even if other position detection means such as an absolute encoder is incorporated into the rotating drum instead of the photoelectric detection element and dog, and various improvements and design changes can be made without departing from the gist of the present invention. Of course, this is possible.

[Brief explanation of drawings]

FIG. 1 is a schematic vertical cross-sectional view of an image scanning reading/recording device according to the present invention, FIG. 2 is a schematic diagram illustrating the configuration of an image scanning reading/recording device according to the present invention, and FIG. 3 is a rotating drum, a dog, and a photoelectric detection element. Figure 4 is a drive control circuit for the solenoid that presses the nip roller against the rotating drum. 10... Image scanning reading/recording device 12... Input section 14... Control section 16
...Output section 24...Document paper amount' feed system 28...Drive roller 41...Optical detection 1
4゛Means 50...Image reading system 74...Loop detector 100...Receive magazine 108...
Dog 110... Photoelectric detection element 150... Flip float 152... AND gate 154... Flip flop 156... Drive circuit 200... Moving plate Applicant: Fuji Photo Film Co., Ltd. 36
! ! Nail ff Author (spontaneous) May 16, 1986
Japan Patent Office Commissioner's Academic Award Dopto 2) Name of the invention Image scanning reading recording device 3, h
Person who corrects IT
Name (520) Fuji Photo Film Co., Ltd. Representative Minoru Ohnishi 4, Agent 5, Supplementary iE Order Weight Voluntary

Claims (2)

[Claims] (1) While conveying the original in the sub-scanning direction, the first light beam is scanned over the original in the main-scanning direction to read the image information of the original, and the image signal thus obtained is subjected to signal processing. In an image scanning reading/recording apparatus that records an image by modulating a second light beam for image recording and irradiating it as a mesh signal onto a photosensitive material, the A position detecting means is disposed on a rotating drum that conveys the photosensitive material in the sub-scanning direction, and the rotating drum is rotated based on a predetermined position of the rotating drum detected by the position detecting means, and a predetermined position is detected with respect to the photosensitive material. Image recording is performed using a first mesh signal having a screen angle of , and then the rotating drum is rotated and exposed again from the predetermined position using a second mesh signal different from the screen angle under the rotational action of the rotating drum. An image scanning reading/recording device configured to record an image on a material. (2) In the device according to claim 1, the position detecting means attaches an arm having a dog disposed on a rotating shaft extending from the rotating drum, and the dog is placed under the rotational action of the rotating drum. An image scanning reading/recording device characterized in that the reference position of the rotating drum is detected by facing a photoelectric detection means.