JPH0358093B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is capable of converting a static color image signal for display on a color monitor cathode ray tube, for example, by using a single electron gun type FOT (fiber optical tube) without causing defects such as image distortion or unevenness. The present invention relates to an apparatus for obtaining high quality color prints.

Conventionally, the following systems are known as this type of device.

(1) A method of capturing images on a color CRT using a camera.

(2) As shown in Figure 1, a single black and white CRT1
01, the still image displayed on this CRT 101 is sequentially passed through filters such as red 102, blue 103, green 104, etc., and an optical lens 105.
A method in which a recording medium 106 such as a color film is exposed to light through a recording medium 106, such as a color film.

(3) As shown in Figure 2, the red color is equipped with a phosphor screen that emits red, blue, and green light, respectively.
CRT201, CRT202 for blue, CRT20 for green
3 is used, and the images on these CRTs are transferred to dichroic plates 204, 205, reflecting mirror 206,
A method of exposing and combining light onto a color recording medium 209 through an optical lens 207 and an optical lens 208.

(4) As shown in Figure 3, the fiber plate 30
1, 3 consisting of red 302, blue 303, and green 304
Equipped with a screen coated with phosphor of seeds
A red electron beam 30 is placed in the CRT envelope 308.
5. Using a recording tube containing an electron gun that generates an electron beam 306 for blue color and an electron beam 307 for green color, each phosphor 302 to 304 is scanned with each electron beam 305 to 307 to form a color recording medium. 309 as a latent image and develop it into a visible image.

However, with the method described in (1) above, the electrical distortion on the CRT and the distortion of the camera optical system combine to make it impossible to obtain high-quality prints, and it takes time to produce a visible image. There are drawbacks. In addition, the method (2) above is an optical method and requires a filter exchange mechanism and a lens mechanism, which generally results in a large and expensive device. on the other hand,
In the method of using three CRTs in the previous section (3), each CRT
If the image position and size cannot be adjusted accurately, there are fundamental flaws such as color shift, and correcting this requires a complex and expensive electrical control circuit. Even if you do, there are some drawbacks that make it less than perfect. Furthermore, in the method (4) above, it is difficult to maintain the parallelism and positional accuracy of each scanning line.

Therefore, the present invention has been proposed to overcome the problems of the color printing apparatuses using the various conventional methods described above, and its purpose is to print still images transmitted by electrical signals at low cost. To provide a color printing device capable of obtaining high quality color prints.

That is, in order to achieve the above object, the present invention uses a single electron gun type FOT, forms a band-shaped optical energy emitting part on the screen surface of this FOT,
It is characterized by a combination of an electrical scanning means for an electron beam and a mechanical traveling means for a color recording medium.

Next, embodiments of a color printing apparatus according to the present invention will be described in detail below with reference to the accompanying drawings.

Figures 4a, b, and c are used in the device of the present invention.
This shows an example of FOT401. That is, the FOT 401 used in the present invention includes a substantially rectangular fiber plate 402 having a flat configuration. The fiber plate 402 has a diameter of 10~
It is constructed by laminating optical fibers of 50 μm and 5 to 10 mm in length in the radial direction to maintain airtightness. This FOT401 is a fiber plate 40
2 (on the electron gun 404 side) is provided with a phosphor screen 403 consisting of a plurality of luminescent colors. This phosphor screen 403 has red 403R, green 403G, and blue 403 as shown in FIG. 4c, for example.
The phosphor having the luminescent characteristics of B is divided into strips.

FIG. 5 shows a method of driving the FOT having the above structure with respect to a color image signal for a raster scan type display. electron beam 505
In this method, a phosphor screen 503 formed in a band shape on a fiber plate 502 and having each luminescent color of red 503R, green 503G, and blue 503B is scanned across in synchronization with a deflection signal of an input image signal. When passing through the screen 503, a color image signal corresponding to each luminescent color phosphor is selected, and brightness modulation is performed using the selected image color signal 510'. That is, from time t ₀ to t ₁ when the electron beam 505 scans the red phosphor 503R, the red component image signal 5
14R to modulate the electron beam current, and red phosphor 50
The light emission brightness at 3R is modulated in accordance with the input signal. Thereafter, from time t ₁ to t 2 and from t _{2 to} t ₃ when the electron beam 505 scans each of the green 503G and blue 503B phosphors in the same manner, the green component 514G,
The brightness of the electron beam current is modulated by the image signal of the blue component 514B. Note that the signal 510' indicates an image signal selectively synthesized in synchronization with the scanning position of the electron beam 505 as described above, and this signal 510'
0' achieves brightness modulation in FOT 501.

Next, the principle of the apparatus of the present invention for color printing using the FOT having the above-mentioned configuration and operation will be explained with reference to FIGS. 6a to 6c.

FIG. 6a shows a raster scan type static color image 60 displayed on a color monitor display.
1a is shown. Part 601b of this still color image
The FOT consisting of the above-mentioned configuration is sampled.
(see FIG. 6b). The displayed image on this FOT is displayed in three color bands of red, blue, and green, and its brightness is modulated by image signals of colors corresponding to the respective phosphors. In addition, FOT fiber plate 6
When the display for one screen of 02 is completed, the next display is performed by shifting the required pixels. In this way, the color still image 601a is displayed in a fixed direction 604 on the phosphor screens emitting red 603R, green 603G, and blue 603B, which are formed in strips on the fiber plate 302, like a part of an electronic bulletin board.
Displays a portion of a still image while shifting it by the required number of pixels. So, like this FOT601
For example, as shown in FIG. 6c, a moving image displayed on the fiber plate 602 of
02, and while moving in a predetermined direction 609 at the same speed as the movement of the image, the color recording medium 607 is exposed to light. Therefore, the red phosphor 50
When the brightness-modulated electron beam 505 crosses 3R, only the red information of the input image signal is recorded as a latent image on the color recording medium. Similarly, a color recording medium is exposed to light in green and blue bands, but by moving in sync with the image and overlapping the images, a complete color latent image can be obtained. .

FIG. 7 is a schematic diagram showing the overall configuration and functions of a color printing apparatus according to the present invention.

As mentioned above, the FOT 701 has red,
Fluorescent screen 7 with green and blue luminescent colors
03 is formed into a band shape, and this fiber plate 7
Display images are displayed moving on 02 like an electronic bulletin board. A deflection electric signal 712 that controls the movement of the displayed image in this manner is applied to a deflection coil 715 via an amplifier 713. Therefore, this signal 712
As a result, the electron beam 717 is emitted while sequentially crossing the phosphor screen on the fiber plate 702, forming an image that moves at a constant speed.

Further, as previously explained in FIG. 5, the FOT 701 controls the switching signal 719 that performs the switching operation at a time determined by the preset strip width of each phosphor and the scanning speed of the moving display image. vessel 72
2, in addition to the color changeover switch 720, a red signal 714R, a green signal 714G, and a blue signal 714 are sequentially activated.
B is selected and the selected signal is supplied to the FOT 701 via the amplifier 718. Therefore, FOT7
01, each electron beam 717 is connected to an amplifier 7.
Signals 714R and 71 of each color component amplified by 18
The brightness is modulated by 4G, 714B.

On the other hand, a color recording medium 707 such as a color film or color photosensitive paper is placed in a dark box 710 in close contact with the fiber plate 702 of the FOT 701 . In this case, the color recording medium 707 is held by a feed roller 705 and a pressure roller 704. In addition, a developing device 70 is provided corresponding to these rollers.
9 will be provided. The feed roller 705 is
Electrical signal 712 for controlling the movement of the image displayed on the fiber plate 702 of the FOT 701
By branching the electrical signal 712 and supplying it to the mechanism control circuit 711, the color recording medium 707 pressed against the fiber plate 702 is moved at the same speed as the displayed image. As a result,
The image on the FOT screen is transmitted to a color recording medium 707 in a fixed direction while being exposed to light, and is developed through a developing device 709 to obtain a visible image.

As a result of the above-described operation, images formed by the three types of phosphors are exposed on the color recording medium 707 in an overlapping manner with respective required pixel offsets, thereby forming a color latent image. At this time, since the moving speed of the image on the FOT screen and the sending speed of the color recording medium are equal, only the color components of the image are shifted and exposed multiple times, but the position of the image on the recording medium is not shifted. As described above, according to the present invention, since the entire still image is exposed on the color recording medium while changing the color components and shifting parts of the still image little by little, the amount of exposure of each color component to the color recording medium depends on the incident Proportional to the signal component. Therefore, by performing a development process suitable for this color recording medium, a color print of the entire still image can be obtained.

FIG. 8 is an explanatory diagram showing another embodiment of the color printing apparatus according to the present invention. That is, in this embodiment, an optical system 830 is provided between the FOT 801 and the color recording medium 807. In this case, the optical system 830 includes a convex lens,
In addition to concave lenses, compound lenses can also be used.
In this embodiment, the FOT 801 has red,
A phosphor screen having green and blue luminescent colors is formed in a band shape, and a display image is moved and displayed on this fiber plate 802 like an electronic bulletin board. The electric signal 812 that controls the movement of the displayed image is sent to the deflection coil 815 via the amplifier 813.
added to. Therefore, with this signal 812,
The electron beam 817 sequentially passes through the fiber plate 80
The light is emitted as it traverses the phosphor screen on 2, forming an image that moves at a constant speed.

Further, as in the above embodiment, the FOT 801 receives a switching signal 819 from a switching controller 822 that performs a switching operation at a time determined by a preset strip width of each phosphor and a scanning speed of a moving display image. In addition to the changeover switch 820, the red light 814
R, green signal 814G and blue signal 814B are selected, and FOT80 is transmitted via the selected signal 818.
Supply to 1. Therefore, in the FOT 801, the electron beam 817 is amplified by the amplifier 818, and each color component signal 814R, 814G, 814B is generated.
The brightness is modulated by

On the other hand, a color recording medium 807 such as a color film or color photosensitive paper is located behind the optical system 830 and placed in a dark box 810 together with the optical system 830. In this case, the color recording medium 807 is held in a holder 821 equipped with a feed roller 805.
In addition, a developing device 809 corresponds to this holder 821.
will be established. The feed roller 805 is
Electrical signal 812 for controlling the movement of the image displayed on the fiber plate 802 of the FOT 801
By branching the electric signal 812 and supplying this electric signal 812 to the mechanism control circuit 811, the color recording medium 807 held in the holder 821 is moved in synchronization with the displayed image. As a result, the color recording medium 807 is sent out in a fixed direction, and the color recording medium 807 is fed out to the developing device 80.
9, and a visible image can be obtained in the same manner as in the previous example.

In the above-mentioned embodiment, the scanning direction of the electron beam was in the direction across the three types of phosphors formed in a band shape with respect to the fiber plate of the FOT.
As shown in Figure 9, red 901R, green 901G,
It is also possible to scan the electron beam 902 parallel to each band-shaped phosphor of blue 901B. In this case, each phosphor is scanned with a plurality of scanning lines to expose the color recording medium. Also, at this time, the direction of movement of the image on the FOT screen is perpendicular to the scanning line.

Furthermore, as a driving method for FOT, the device of the present invention can also be applied to vector scanning color display signals. In this case as well, the direction of movement of the color recording medium is the direction across the band-shaped phosphor. Furthermore, even when the electron beam is vector-driven, the displayed image on the fiber plate of the FOT is modulated in brightness by a color image signal corresponding to the phosphor at the scanning position of the electron beam, as described in the above-mentioned embodiment. It is similar to Color prints can be easily obtained by carrying out the same methods as described above for other methods such as moving the image on the FOT and moving the color recording medium.

Further, as another example of the FOT used in the device of the present invention, as shown in FIG. Considering the improvement of image quality due to
on the front side of the fiber plate, each phosphor 1003
Provided at positions corresponding to R, 1003G, and 1003B. This makes it possible to improve the tone of color prints.

As is clear from the above-mentioned embodiments, in the present invention, a color still image can be exposed on a color recording medium by using one single electron gun type FOT. Variations in beam width or electrical characteristics, which determine brightness and resolution, can be ignored compared to the case of conventional methods.
In addition, it is possible to provide a color printing apparatus at a low cost, which has an extremely simple configuration and can produce high-quality color prints with almost no need for correction of color misregistration caused by positional misalignment. In particular, in the present invention, an image is displayed on the entire FOT screen,
Since the color recording medium is exposed to light while moving, there is an advantage that the influence of local brightness unevenness on the FOT screen is ignored.

[Brief explanation of drawings]

FIGS. 1 to 3 are explanatory views showing the principles of conventional color printing devices, and FIGS. 4 a to c are FOTs used in the color printing device according to the present invention.
FIG. 5 is an explanatory view of the operation of the FOT shown in FIG. Figures 6a to 6c are diagrams explaining the principle of the color printing apparatus according to the present invention, in which a is a front view of a color still image, b is an explanatory diagram of the operation of the FOT shown in Figure 4, and c is a diagram explaining the operation of the FOT shown in Figure 4. 7 is a block diagram of the apparatus of the present invention, FIG. 8 is a block diagram showing another embodiment of the apparatus of the present invention, and FIG. 9 is a diagram showing the scanning direction of the electron beam in the apparatus of the present invention. FIG. 10 is an explanatory diagram showing another embodiment of the FOT used in the device of the present invention. 101, 201, 202, 203...Single electron gun type CRT, {102, 103, 104, 403'
R, 403'G, 403'B, 1002R, 100
2G, 1002B}...Color filter, 10
5,208,830...Optical lens (optical system),
106,209,309,607,707,80
7... Color recording medium, 204, 205... Dichroic plate, 206, 207... Reflecting mirror, 30
8...CRT envelope, {305, 306, 307,
505,717,817,902}...electron beam, 301...fiber plate, {302,3
03,304,403R,403G,403B,
503R, 503G, 503B, 901R, 90
1G, 901B, 1003R, 1003G, 10
03B}...Fluorescent material with different luminescent colors, 401,5
01,601,701,801...FOT, 40
2,502,602,702,802...Fiber plate, 601a...Still color image, 60
1b... Part of a still color image, 609... Moving direction of color recording medium, 704... Pressure roller,
705,805...Feed roller, 709,809
...Developer, 710,810...Dark box, 711,
811... Mechanism control circuit, 712, 812...
Electrical signal, 713, 813...Amplifier, 715,
815... Deflection coil, 716, 816... Electron gun, 821... Holder, 719, 819... Switching signal, 720, 820... Color selection switch, 72
2,822...Switching controller, {714R,714
G, 714B, 814R, 814G, 814B}
...Color image signal.

Claims (1)

[Scope of Claims] 1. A screen in which a plurality of phosphors emitting different colors are coated in strips on the electron gun side of a fiber plate in an apparatus that photoelectrically converts the electrical signals of a color still image into a visible image and prints in color. A single electron gun type FOT (fiber optical tube) having means for displaying a part of the color still image by selecting an image signal corresponding to the emission color of the phosphor to be displayed and modulating the brightness of the electron beam; A means for sequentially displaying parts of still images and this single electron gun type
A color printing apparatus comprising means for moving a color recording medium placed opposite to the FOT in synchronization with the moving speed of an image displayed on the FOT, and a developing means for the color recording medium. 2. In the color printing device as set forth in claim 1, the phosphors emitting different colors on the single electron gun type FOT screen are painted in strips in the moving direction of the color recording medium, and A color printing device consisting of a single electron gun type FOT, each of which has a coating width at least five times the diameter of an electron beam spot. 3. A color printing device according to claims 1 and 2, in which the color recording medium is brought into close contact with the image display surface of a single electron gun type FOT. 4. In the color printing device according to claim 1 or 2, the color recording medium is
A color printing device that is positioned via an optical system that optically transmits the image displayed on a single electron gun type FOT.