JPH0396166A - Picture forming device - Google Patents

Abstract

PURPOSE:To obtain a sharp picture even when the brightness of a cathode ray tube is increased hy using a micro channel plate to apply current amplification to a picture information light radiating from an electron gun. CONSTITUTION:A blanking circuit 35 extracts a signal from a video signal so as not to light up a cathode ray tube 20 during the blanking period and sends the signal to a CRT drive circuit 36, which clamps the video signal and supplies it to a cathode of the cathode ray tube 20, then an image corresponding to the video signal is formed on the cathode ray tube 20. Moreover, an electron beam radiating from an electron gun 22 and converged therein is made incident in a micro channel plate 50, where the beam is subject to electron multiplication and the electrons collides with a fluorescent screen 23, on which the fluorescent substance is excited. Furthermore, the micro channel plate 50 consists of minute photo multipliers 51 arranged in 2-dimension. Thus, a sharp picture is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an image forming apparatus that exposes a photosensitive recording medium.

[Prior Art] Conventionally, an electron tube that electrostatically or electromagnetically converges an electron beam has been used as a cathode ray tube used in this type of image forming apparatus.

[Problem to be Solved by the Invention] However, in such a cathode ray tube, when the current of the electron beam is increased in order to increase the brightness, the convergence of the beam deteriorates, resulting in a blurred image. there were.

The present invention has been made to solve the above-mentioned problems, and it increases the brightness of the phosphor surface while keeping the current value low in the convergence stage by disposing a microchannel plate just before the phosphor surface. An object of the present invention is to provide an image forming apparatus using a cathode ray tube that can perform

[Means for Solving the Problems] In order to achieve this object, the image forming device or device of the present invention has an electron gun that emits an electron beam based on a video signal disposed on the proximal end side of the tube body. an electron multiplier for emitting secondary electrons and multiplying the number of secondary electrons by the beam energy of the electron beam emitted from the electron gun; A secondary electron accelerating means for accelerating secondary electrons is disposed, and a phosphor that emits light upon incidence of the secondary electrons accelerated by the secondary electron accelerating means is attached to the front glass surface of the tube body. A cathode ray tube is used. In this case, if the phosphor is made of a fluorescent substance that emits red light, green light, and blue light, color image display is also possible. Note that the present invention is not limited to the embodiments described in detail above, and various changes can be made. For example, silver halide photographic paper can be used as the photosensitive paper, and the cathode ray tube is not a raster scanning type, but a line scanning F. 0. It is also possible to use T.

[Function] According to the cathode ray tube of the present invention having the above configuration, the electron beam emitted from the electron gun based on image information is increased in output by the microchannel plate, causing the phosphor on the fluorescent surface to emit light. .

[Embodiments] Hereinafter, embodiments embodying the present invention will be described with reference to the drawings.

First, the overall configuration of the image forming apparatus will be explained with reference to FIG. The photosensitive and pressure-sensitive microcapsule paper 3 housed in the microcapsule paper cartridge 2 is guided by microcapsule paper conveying rollers 4a and 4b, and then transferred to a pressure developing unit 6.
The paper passes through the microcapsule paper winding roller 8 and is wound up.

The color developer sheets 10 are stored in a color developer sheet cassette 9, and are taken out one by one by a color developer sheet feed roller 8, guided to a color developer sheet guide 11, and placed under pressure. The sheet passes through the developing unit 6 and the paper ejection guide 12, is driven by the thermostatic conveyor belt 15, passes through the thermal fixing unit 13, and is then ejected to the paper ejection tray 16 as an output sheet 17. A cathode ray tube 20 is located below the housing 1, and its raster image is projected and formed onto the exposure surface 5 by a lens 18.

At that time, color separation filters 19a, b,
c can be selectively inserted.

Next, the configuration of the electric circuit system of the image forming apparatus according to the present invention will be explained with reference to FIG. A video signal from an external host computer etc. consists of three luminance signals of R, G, and B, for example, and is input to the input connector 31 and sent to the input buffer 32.
It is received at a, b, and c and input to the data selector 33. The signal selected by the data selector 33 is input to the variable contrast circuit 34, and after the contrast is adjusted according to a command from the CPU 40, it is input to the planking circuit 36. The planking circuit 35 extracts a signal from the video signal so that the cathode ray tube 20 does not emit light during the retrace period, and sends it to the CRT drive circuit 35. The CRT drive circuit 36 clamps the video signal and applies it to the cathode of the cathode ray tube 20, so that an image corresponding to the video signal is formed on the cathode ray tube 20.

Further, the synchronization signal superimposed on the video signal is separated by a synchronization separation circuit 37 and taken out as a horizontal synchronization signal and a vertical synchronization signal. The synchronization signal is input to the deflection circuit 38 and three high voltage generation circuits, and the deflection circuit 38 is connected to the deflection yoke 2.
1 causes the cathode ray tube 20 to perform raster scanning, and the high voltage circuit 39 supplies various voltages necessary for the cathode ray tube 20.

Further, the cathode ray tube 20 has a configuration as shown in FIG. Emitted by electron gun-22. The focused electron beam enters the microchannel plate 50, undergoes electron amplification, and then collides with the fluorescent surface 23 to generate a fluorescent substance. Here, the microchannel plate 50 is formed by two-dimensionally arranging minute electron multiplier tubes 51, as shown in FIG.

Next, the operation of the image forming apparatus of this embodiment will be explained with reference to FIGS. 1 and 2. When the start switch on the display panel 41 is pressed, the CPU 40 causes each section to perform the following operations.

i) Insert the red color separation filter 19a into the optical path.

1l) Make the data selector 33 select the red video signal component and expose the microcapsule 3 for a predetermined time.

Here, the photosensitive pressure-sensitive microcapsule paper refers to a base paper containing a photocurable resin whose hardness changes depending on light, a photopolymerization initiator, and a dye precursor, as disclosed in JP-A No. 58-88739. It is constructed by adhering encapsulated microcapsules.

iii) The same thing as above is performed using a combination of the green component of the video signal and a green color separation filter, and a combination of the blue component of the video signal and a blue color separation filter.

As a result, in the part of the photosensitive pressure-sensitive microcapsule paper 3 corresponding to the exposed surface 5, the microcapsules in the part irradiated with light are hardened, and the microcapsules in the part not irradiated with light remain unhardened. A latent color image is formed on the surface of the photosensitive pressure-sensitive microcapsule paper 3 by exposure.

1v) Drive the microcapsule paper take-up roller 14 and the microcapsule paper transport rollers 4a and 4b, and when the starting position of the formed latent image reaches a predetermined position in front of the pressure developing rollers 7a and 7b, the color developing sheet The developer sheet 10 is fed out from the developer sheet cassette 9 by driving the sheet feed roller 8 , and the developer sheet 10 that is fed out is transferred to the pressure developing roller 7 .
When the pressure developing roller 7 reaches the predetermined position in front of the rollers a and 7b,
A and 7b are controlled to be in contact with each other.

(2) While maintaining the state of V) above, feed the photosensitive pressure-sensitive microcapsule paper 3 and the color developer sheet 10 for one screen.

At this time, the exposed surface of the photosensitive pressure-sensitive microcapsule paper 3 and the color developer coated surface of the color developer sheet 10 are passed between the pressure developing rollers 7a and 7b in a state where they face each other.

As a result, the hardened microcapsules are not destroyed,
The uncured microcapsules are destroyed and react with the color developer to form a color image on the color developer sheet 10.

vi) Stop the microcapsule paper transport rollers 4a, 4b and the microcapsule paper take-up roller 14, and widen the interval between the pressure developing rollers 7a, 7b.

vli) The developer sheet 10 sent toward the heat fixing unit 13 by the paper discharge guide 12 is transferred to the heat constant conveyor belt 15.
After being thermally fixed, the sheet is discharged onto a paper discharge tray 16 as an output sheet 17.

This completes one process of color image output using photosensitive pressure-sensitive microcapsule paper.

[Effects of the Invention] As is clear from the detailed description above, according to the image forming apparatus of the present invention, the image information light emitted from the electron gun is current amplified by the microchannel plate, so that the cathode ray tube Even if you increase the brightness of the image, the image will not become blurred. Therefore, there are advantages such as the ability to obtain clear images in color image recording and the like.

[Brief explanation of drawings]

1 to 4 show embodiments embodying the present invention. FIG. 1 is a block diagram of the electrical system of the image forming apparatus, and FIG. 2 is a block diagram of the mechanical system of the image forming apparatus. 3 is a sectional view of a cathode ray tube incorporating a microchannel plate, and FIGS. 4(a) and 4(b) are structural diagrams of the microchannel plate. In the figure, 20 is a cathode ray tube, 22 is an electron gun, 23 is a fluorescent surface,
50 is a microchannel plate. Patent applicant Brother Industries, Ltd. President Yoshihiro Yasui

Claims (1)

[Claims] 1. An electron gun that emits an electron beam based on a video signal is arranged on the base end side of the tube body, and inside the tube body, secondary electrons are emitted by the beam energy of the electron beam emitted from the electron gun. A photoelectron multiplier that multiplies the number of secondary electrons and a secondary electron accelerator that accelerates the secondary electrons multiplied by the secondary electron multiplier are provided on the front glass surface of the tube body. An image forming apparatus characterized in that a cathode ray tube provided with a phosphor that emits light upon incidence of secondary electrons accelerated by the secondary electron accelerating means is disposed oppositely on a photosensitive paper.