JPS58121532A - Cathode ray tube - Google Patents

Abstract

PURPOSE:To obtain a color print of high quality at low cost, by providing a belt shaped optical energy emission part with different color of emitted light to a screen surface of a cathode ray tube (CRT) of single electron gun type and skilfully combining an electric scanning means of electron beams and mechanical running means of color recording media. CONSTITUTION:A stationary color picture 501' of raster scanning type displayed on a color monitor display is partially displayed on a rectangular face plate 502 of a cathode ray tube (CRT). Here said picture 501' is displayed as in an electric sign board while being moved in a fixed direction 504 at a fixed speed for a fluorescent material formed in a belt shape to the plate 502 emitting light in color respectively of red 503R, green 503G and blue 503B. Here the picture moved in this way on the plate 502 is projected through an optical system 506 to a color recording medium 507 synchronously moved with said picture.

Description

Detailed Description of the Invention The present invention provides a screen (face plate) coated with a plurality of phosphors emitting different colors using a static color image signal displayed on, for example, a color monitor cathode ray tube.
The present invention relates to a cathode ray tube used in a device that produces high quality color prints without causing defects such as image distortion and unevenness using a single electron gun type CRT.

Conventionally, the following methods are known as this type of color printing apparatus.

(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, and the still image displayed on this CRT 101 is colored red 102. A method of sequentially exposing a recording medium 106 such as a color film to light through an optical lens 105 and passing through filters such as blue 1031 and green 104.

(3) As shown in FIG. 2, a red CRT 201 is equipped with a phosphor screen that emits red, blue, and green light, respectively.
Blue CRT202. Three line CRTs 203 are used, and the images of these CRTs are transferred to the dichromic board 20.
4.205, reflector 206.207 and optical lens 2
08 to expose and compose the color recording medium 209.

(4) As shown in Figure 3, fiber grade 30
1 and red 302. Blue 303. Red electron beams 3o5. 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 obtain a color image. A method that creates a latent image on the recording medium 309 and develops it to create 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. Further, the method (2) above is an optical method and requires a filter exchange mechanism and a lens mechanism, which generally results in a disadvantage that the device becomes larger and more expensive. On the other hand, the method using three CRTs as described in (3) above has a fundamental flaw, such as color shift, which occurs if the image position and size of each CRT are not accurately matched. This requires a complex and expensive electrical control circuit, but even this has the disadvantage that it is not 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 color printing devices using the various conventional methods described above, and its purpose is to prevent color misregistration and misalignment with a simple configuration. The object of the present invention is to provide a CRT, that is, a cathode ray tube, used in a color printing device that can obtain color prints of high quality.

That is, in order to achieve the above-mentioned object, the present invention uses a single electron gun type CRT, provides a band-shaped light energy emitting section with different emission colors on the screen surface of this CRT, and connects an electric electron beam scanning means and a color It is characterized by a structure in which high-quality color prints can be obtained at low cost by cleverly combining the recording medium with a mechanical traveling means.

Next, embodiments of the cathode ray tube according to the present invention will be described in detail below with reference to the accompanying drawings.

FIGS. 4(a), 4(b)', and 4(c) show an embodiment of a cathode ray tube or CRT 401 according to the present invention. That is, the CRT 401 of the present invention is
The slit-like window portion has a flat configuration consisting of a rectangular face plate 402. This CRT 401 has at least a plurality of fluorescent surfaces 403 emitting light of different colors on the inner surface (on the electron gun side) of the face plate 4o2. Fluorescent surface 403
For example, as shown in FIG. 4(c), it is composed of three types of phosphors: red 403R, green 403G, and blue 403B, and each of these phosphors 403R.

403G and 403B are applied in a band shape so that the diameter is 5 times or more the scanning beam diameter.

Further, as an alternative to the rectangular face plate 402 attached to the CRT 4.01 described in @, FIG. 4(d) shows.

As shown in (e), the inner surface of the face plate 402 (
A white phosphor 403 is coated on the electron gun side), and a red filter 403 is coated on the outer surface of the face plate 402 facing the white phosphor 403.
°R9 green filter 403'G and blue filter 403°B are installed, and each of these filters 403"R
, 403'G, and 403''B are arranged in a band shape so that the diameter is five times or more the scanning beam diameter.

Next, the cathode ray tube (CRT) of the present invention having the above configuration
The principle of an apparatus that performs color printing using a printer will be explained with reference to FIGS. 5(a) to 5(c).

FIG. 5(a) Fi shows a still color image 501° of the Rusk scan type displayed on a color monitor display. A portion of this still color image is displayed on the rectangular face plate 502 of the CRT having the configuration described above.
See FIG. 5(b)]. In this case, the color still image 5
01' is displayed on the fluorescent bodies formed in band shapes on the face plate 502 and emitting red 503R, green 503G, and blue 503B, while moving in a constant direction 504 at a constant speed like an electronic bulletin board. Therefore, the image moving on the face plate 502 in this way is
For example, as shown in FIG. 5(c), the image is projected via an optical system 506 onto a color recording medium 507 that moves in synchronization with the movement of the image. On the other hand, the face plate 502
Red 503R, green 503G, blue 503B formed into strips.
When passing through the phosphor 503, the electron beam 505 scans across the phosphor 503 having each emission color.
A color image signal corresponding to the phosphor of each emission color is selected, and brightness modulation is performed using the selected signal. Therefore, the red phosphor 5
When the brightness-modulated electron beam 505 crosses 03R, only red information is recorded as a latent image on the color recording medium 507. Similarly, the color recording medium 50
7, green and blue are color-coded and exposed, and by moving in synchronization with the image and recording them overlappingly, one completed color A image can be obtained.

Alternatively, instead of the optical system described above, it is also possible to use an optical fiber recording tube having an optical fiber plater on the face plate 502 of the CRT.

Furthermore, if the width of the coated area of each phosphor on the face plate of a CRT is made equal, the synergistic effect of the luminous efficiency of the phosphors with different emitting colors and the sensitivity characteristics of the color recording medium will reduce the color unevenness by one color. fi'd may occur. Unfortunately, the coating width of the phosphor is not necessarily equal.

From this point of view, when designing a color printing device, it is necessary to measure the luminance characteristics of each red, green, and blue phosphor using the same electron beam and the sensitivity characteristics of the color recording medium. It is important to determine the width of each application of the radiator within the faceplate 1-. In this case, it is possible to further divide the same phosphor, but the width of the divided minimum coating area is determined by the control of the electrical signal used to change the color without deflecting the electron beam. Due to the necessary technical and economic factors, it was confirmed that there is a limit range approximately five times the half width of the electron beam.

Therefore, for example, as shown in FIGS. 6(a) and 6(b), phosphors 603R and 603G have different slit widths in the face plate 602 of a CRT.

603B (see FIG. 6(a)), and there are still multiple sets of phosphors 603R1~. 603Gi~n, 603B1~
. By providing [see FIG. 6(b)], it is possible to obtain a high quality color image without color shift or color unevenness and with good color balance.

On the other hand, the electron beam 701 generally has a spread and an electron density as shown in FIG. 7(a). Therefore, it is known that when an electron beam having such an energy distribution is injected into a phosphor, the emission luminance distribution will be approximately the same. When performing color printing, this broadening of the luminance distribution may cause color turbidity. For this reason, it becomes necessary to reduce the brightness of the light emitting periphery, and to meet such a requirement, it is suitable to configure the face plate 702 as shown in FIG. 7(b), for example.

In the embodiment shown in (i) of FIG. 7(b), a white light-emitting phosphor 703 is coated on the electron beam side of the face plate 702 in a matrix shape of approximately the half width of the electron beam, and Color filters 703'R, 703°G on the surface,
It has a temperature of 703°B.

Further, in the embodiment shown in (ii) of FIG. 7(b), a light-shielding thin film 704 is provided which is in close contact with one side of the face plate 702 and has an opening as shown in FIG. 7(c). For example, three types of phosphors 703R and 70 are disposed on the thin film 704.
3G and 703B were applied to the divided parts into strips.

By using these methods, the spread of the electron beam is cut, and the characteristics of the electron beam become as shown by the broken line 701' in FIG. 7(a). As a result, color turbidity is prevented and high quality color prints can be easily obtained.

Furthermore, as another embodiment of the present invention, FIG. 8(a),
As shown in (b), (c), and (d), three types of phosphors 803R, ε in the face plate 802
(03G.

By applying thin strips perpendicular to the electron beam scanning direction 810 for the strip-shaped coating portions of 803B, it is effective to prevent the electron beam brightness from spreading as shown in FIG. 7(a). It is.

As is clear from the above-mentioned embodiments, the cathode ray tube of the present invention is capable of exposing a color still image to a color storage medium by using one of the cathode ray tubes of the present invention. The variation in can be ignored. 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. Therefore, the cathode ray tube of the present invention can be widely applied as a printing device for color graphics and other terminal equipment.

[Brief explanation of the drawing]

1 to 3 are explanatory diagrams showing the principles of a conventional color printing device, and FIGS. 4(a) to 4(e) are explanatory diagrams of a cathode ray tube according to the present invention, in which (a) is a two-part diagram. (b) is a front view showing one embodiment of the face plate; (C) is a side view of figure (b); (d) is a front view showing another embodiment of the face plate; (e) 5(d) is a side view of FIG. Front view of color still image,
6(b) is an explanatory diagram of the operation of the cathode ray tube of the present invention, (C) is an explanatory diagram of the exposure state to a color storage medium, and FIGS. 6(a) and 6(b) are respectively different embodiments of the cathode ray tube of the present invention 7(a) is a front view of a face plate consisting of one set of phosphors, (b) is a front view of a face plate consisting of multiple sets of phosphors, and FIGS. 7(a) to (C)
shows yet another embodiment of the cathode ray tube of the present invention,
(a) is a characteristic curve diagram of the electron beam, (b) is a side view of the face plate, and (C) is a front view of the main parts of the face plate.
c) and (d) show other embodiments of the cathode ray tube of the present invention; (a) is a plan view showing the coating state of the phosphor in the scanning direction of the electron beam; A side view, (c) a plan view showing the coating state of the phosphor in another scanning direction of the electron beam, and (d) a side view of the figure (C). 101, 201.202.203...Single electron gun type C
RT105, 208.506...Optical lens 106, 2
09.309.507...Color storage medium 204, .
205...Diphromic plates 206, 207...Reflecting mirror 301...Fiber plate 308...CRT envelope 305, 306.307...Electron beam 401, 501
... Braun tube (CRT) 402, 502.602.
702...Face plate 403, '703...
Fluorescent surface 501'...Still color image 504/Movement direction 701...Electron beam spread 701゛...
・Emission distribution 704...Light-shielding thin film patent applicant
Japan Radio Co., Ltd.

Claims (1)

[Scope of Claims] (1) In a single-electron gun type cathode ray tube equipped with a screen formed by applying and forming a plurality of phosphors of different luminescent colors in a band shape, the coated portion of each phosphor is formed in the shape of an electron beam. A cathode ray tube characterized in that it is formed at least five times as wide. (2. Scope of Claims In the cathode ray tube according to claim 1, the coating width of each phosphor is set to a predetermined width in order to compensate for the luminous efficiency of the phosphors. (3) Scope of Claims A cathode ray tube according to claim 1 or 2, comprising a screen in which a light-shielding wall exists between phosphors of different emission colors. (4) Claims 1 to 3. In any one of the cathode ray tubes, the screen member on which the phosphor is applied and formed in a band shape is a cathode ray tube constituted by a face plate made of a transparent optical glass plate. (5) Claims 1 to 3 In the cathode ray tube according to any one of the above, the screen member on which the phosphor is coated and formed in a band shape is constituted by a fiber plate made of optical fiber.