JPS59223064A - Picture recording device - Google Patents

Abstract

PURPOSE:To realize a picture recording device in which a cathode ray tube to be subjected to one-dimensional scanning is used as the exposure means and which does not produce any streaks with a simple constitution, by moving the scanning position with an electronic beam on a fluorescent screen in the direction normal to the direction of the one-dimensional scanning as recording proceeds. CONSTITUTION:A cathode ray tube 1 has a fluorescent screen 1a at the center. 2 in the figure shows a deflection coil mounted on the cathode ray tube 1 and only a vertical deflection coil is shown here. A photosensitive film, etc., are held at the surface of a rotary drum 3. A control section 4 gives a video signal and deflection signal to the cathode ray tube 1 and controls the rotating speed of the rotary drum 3. The relation between a deflection step and the rotating speed of the rotary drum 3 is selected in such a way that, when the rotary drum 3 makes one turn, deflection on the full width (h) of the fluorescent screen can be completed. Moreover, the problem on the picture recording caused by the divergence of the scanning position can be avoided when the rotating speed of the rotary drum 3 is selected properly. When the above mentioned constitution is used, a scanning line (l) moves in the direction normal to the scanning line (l) as recording proceeds. Unevenness in the quantity of light at each scanning line changes every time due to its randomness and, therefore, no streaks occur.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an image recording apparatus using a cathode ray tube (including an optical fiber tube) as an exposure means. li! scanned @ polar ray tube as exposure means! ii relates to an image recording device.

(Prior Art) The fluorescent surface of a cathode ray tube, such as an optical fiber tube, used in this type of image recording apparatus is flat. For this reason, the distance between the electron gun that emits the electron beam and the fluorescent surface is smaller at the center fluorescent surface and larger at the edges, which naturally causes the problem that the brightness of the tube surface is high at the center and low at the edges. However, the essential problems that arise with this structure are the method of controlling the grid voltage to a predetermined value in synchronization with the scanning of the electron beam, that is, the method of increasing the grid voltage when scanning the edge, and the method of controlling the grid voltage to a predetermined value in synchronization with the scanning of the electron beam. This problem can be solved by measuring the brightness during scanning, creating a brightness correction signal based on the information, and changing the grid voltage to make the brightness at the center and edges constant.

On the other hand, uneven brightness is caused by uneven coating of the phosphor.
ll! There is brightness unevenness, and even the above two methods cannot satisfactorily solve this brightness unevenness. This is because uneven coating of the phosphor appears as irregular and extremely fine unevenness in brightness, so of the above two methods, the former method cannot solve the problem at all, and even the latter method cannot solve the problem.
This is because there is a limit due to the relationship between L and L. Such unevenness in brightness also occurs due to non-constant electron beam sweeping speed, and in either case, it results in unevenness in the amount of light on the photoreceptor.

Furthermore, in the case of an optical fiber tube, variations in transmission loss due to the condition of the end face of the A-butical fiber also cause unevenness in the amount of light.

With current technology, as mentioned above, it is difficult to remove even the finer unevenness of light intensity, and for this reason, when obtaining a hard copy using this second image recording device, there is no problem with binary images. However, major problems have arisen, especially when obtaining hard copies of gradation images. That is, on a two-dimensional image recorded by moving the photoreceptor in the sub-scanning direction, unevenness in the amount of light in the main-scanning direction appears as streaks in the sub-scanning direction, causing a problem in which the image quality is significantly degraded. .

For example, there is a problem in which white lines or black lines appear in the sub-scanning direction in a black and white gradation image.

(Object of the Invention) The present invention has been made in view of the above-mentioned problems, and its purpose is to realize an image recording device with a simple configuration in which the above-mentioned streaks do not occur (Structure of the Invention) The present invention achieves the object in an image recording apparatus using a cathode ray tube as an exposure means in which a fluorescent surface is one-dimensionally scanned by an electron beam, in which the position of a scanning line on the fluorescent surface by the electron beam is recorded. The present invention is characterized in that it is configured to move in a direction perpendicular to the -dimensional scanning direction.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a configuration diagram of main parts showing an embodiment of the present invention, and in the figure,
Reference numeral 1 designates a cathode ray tube, the plane of which is shown in FIG. 2, and has a fluorescent surface 1a in the center. 2 is attached to cathode ray tube 1 and l'
c Is directed co-coil, here only the vertical deflection coil is shown. Reference numeral 3 denotes a rotating drum, on the surface of which holds an Instant 1-type film or various photosensitive films (photoreceptor), or whose surface itself is formed of a photoreceptor. The film held by the rotating drum 3 is preferably one made of a transfer photosensitive material.

The diffusion transfer photosensitive material referred to here is, for example, one that is constructed as an instant type film, and the film uses a reversal emulsion in the photosensitive layer, and a dye and a spreader lubricant under each photosensitive layer.
dye-re
Silver halide in the exposed areas (J reversal emulsion, so it is not developed, but the silver halide in the unexposed areas is reduced by the developer, and at the same time the developing main mulberry is oxidized. Due to the action of oxidation products and Al-7J,
A dye is released from the dye releaser, and the diffusible dye is diffused and transferred to the image-receiving layer, and combines with the chelate compound in the image-receiving layer to form a positive dye image. Using this film, processing can be done in a short time, and the resulting photographs are
It has excellent resolution and color reproducibility, and is of the same quality as general silver halide film.

Reference numeral 4 denotes a control section which supplies a video signal to the cathode ray tube 1, a deflection signal to the deflection coil 2, and controls the rotational speed of the rotary drum 3. FIG. 3 shows a specific example of the configuration of this control section 4. As shown in FIG. In the figure,
When 41 receives a recording start signal, its output rises.
It is a flip-flop whose output falls when it receives a recording end signal from a comparator 51, which will be described later, and its output is input to a clock pulse generation circuit 42 and a motor control circuit 43. When the output of the flip-flop 41 is H11, the clock pulse generation circuit 42 generates clock pulses as shown in FIG. 4<a> to the sawtooth wave generation circuit 44. The output is output to the counter 45 and the video signal output section 46, and the royal-duty control circuit 43 causes the drive motor (not shown) of the rotary drum 3 to rotate at a constant speed when the output of the flip-flop 41 is H''. Sawtooth wave generation circuit 44
There is a circuit C which applies a sawtooth wave (see FIG. 4 (IJ)) to the horizontal deflection circuit (circuit for deflecting the electron beam in the main scanning direction) 47 in synchronization with the J pulse. Further, the counter 45 counts clock pulses, and the counted value is converted into a sawtooth wave (see Fig. 4 (C)) via a D/A transformer 48 and an amplifier 49, and is converted into a vertical deflection wave. circuit(
The electron beam is applied to a circuit (circuit) 50 for directing the electron beam to a copper surface in a direction perpendicular to the main scanning direction, and is also directly input to one input terminal of a comparator 51. The comparator 51 uses this count value and the main scanning number setting 1 given to the other input terminal.
i1'i is compared, and when the number of main scans reaches the fixed value of Ω, the output of the 7-lip 70-tube 41 is caused to fall. The video signal A signal output section 46 outputs a video signal 71 for one scanning line in synchronization with the clock pulse. The relationship between the deflection step in the direction perpendicular to the main scanning direction of the electron beam and the rotation speed 1 of the rotating drum 30 is, for example, when the rotating drum 3 rotates once, the full width of the fluorescent surface (second
Although it is selected so that the deflection for 11) in the figure ends, it is not necessarily limited to this relationship. or,
Problems in image recording due to misalignment of the scanning line position can be easily avoided by selecting the rotational speed of the rotary drum 3.

According to the embodiment with the above configuration, as shown in FIG. 2, the scanning line l is scanned Pitl! along with recording. It will move in a direction perpendicular to. Therefore, due to its random nature, the unevenness in the amount of light in each scanning line becomes irregular every time, and the above-mentioned streaks do not occur.

In addition, for color image recording, as shown in FIG.
There is a method in which a color image is recorded on a photoreceptor using the principle of additive coloring by covering the photoreceptor with ID and scanning each color fill with a color-separated video signal. There is also a method of recording a color image by coating a fluorescent surface with red, green, and blue phosphors.Of course, the present invention can also be applied to image recording devices using these methods. For example, 14 rams can be configured to rotate for each color, exposing the photoreceptor with light that has passed through the corresponding color filter or phosphor for each rotation, and to The scanning line may be configured to avoid moving within the width of the color filter or phosphor.However, in this case, if the boundary between each color is scanned, color mixing may occur. Therefore, as the vertical deflection signal, it is necessary to select a signal that scans by skipping the boundary portion, for example, a signal having a waveform as shown in FIG.

In addition, a photosensitive resin of a different type from the photoreceptor, Se,
A photoreceptor such as OPC, amorphous silicon, used in electrophotography is used as an image carrier that receives light from an exposure means, and an electrostatic IA image and a toner image are formed by electrophotography to form a recording material. The present invention can also be applied to image recording devices that perform image transfer.

(Effects of the Invention) As described above, the present invention makes use of the unevenness of the amount of light, and according to the present invention, it is possible to reliably prevent the occurrence of streaks caused by the unevenness of the amount of light. However, the configuration required for this is
It simply applies a vertical deflection to the electron beam,
It's extremely simple.

[Brief explanation of the drawing]

Figure 1 is a configuration diagram of the main parts of an embodiment of the present invention, and Figure 2 is a diagram of the main part of an embodiment of the present invention.
The front view of the cathode ray tube in the figure, Figure 3 is a block diagram showing a specific example of the configuration of the control section in Figure 1, Figure 4 is an operating waveform diagram of the circuit in Figure 3, and Figure 5 is a color diagram. Explanatory diagram of image recording, No. 6
The figure is a waveform diagram showing a vertical deflection signal in another embodiment of the present invention. 1... Cathode ray tube 1a... Fluorescent surfaces 1b to 1d
... Color filter 2 ... Deflection coil 3 ... Rotating drum 4 ...
Control unit patent applicant Konishiroku Photo Industry Co., Ltd.

Claims (3)

[Claims] (1) In an image recording device whose exposure means is a cathode ray tube whose fluorescent surface is one-dimensionally scanned by an electron beam, the scanning line position on the fluorescent surface by the electron beam is recorded perpendicular to the -dimensional scanning direction. 1. A Ti1 image recording device characterized in that it is configured to be able to move in any direction. (2) As the cathode ray tube, the tube surface is red in the scanning direction. 1. The method according to claim 1, wherein a striped color filter of green and blue is used, and the scanning line position is moved within the range of the corresponding color filter for each color. Image recording device. (3) The cathode ray tube used has a fluorescent surface painted with red, green, and blue phosphors, and the scanning line position is moved within the range of the corresponding phosphors for each color. An image recording device according to claim 1, characterized in that: