JPS60123163A - Method for generating deflection signal of color fiber optical tube - Google Patents

Abstract

PURPOSE:To attain efficient deflection by performing digitally vertical deflection and horizontal deflection to a fiber optical tube (FOT) and storing in advance a data to a lookup table. CONSTITUTION:Picture information PI decomposed into RGB is stored in a buffer memory 32 via a multiplexer 30 and an AD converter 31. A color control signal CD, a blank signal BLC and a picture element clock PCK to output a picture signal of the RGB stored in the memory are outputted from a timing generating circuit 33, and the picture element clock PCK outputs a picture element address PA to access lookup tables 40, 41 storing respectively the vertical deflection signal and the horizontal deflection signal and the memory 32 at an address generating circuit 34. The RGB position signal (vertical deflection signal) VD and the horizontal deflection signal HI accessed from the tables 40, 41 are impressed to a deflecting plate 21A of an FOT21 via amplifiers 45, 47 respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) This invention is directed to color FOT (Fiber Optica
1 Tube).

(Technical background of the invention and its problems) Fig. 1 UA and Figs. 2 (A) and (B) show examples of color FOTI that is the object of this invention.
l is a nearly rectangular FDP with a flat configuration on its front surface (
Fiber Optical Plate) 2.

On the inner surface of the FDP 2 (electron gun 3 side), a phosphor screen 5 made of a plurality of luminescent colors is layered, and this phosphor screen 5 is, for example, red (R) as shown in FIG. ) and a green (G) phosphor 5R.
) and a phosphor 5B having blue (B) light emitting characteristics are coated in a meter shape, and each color information emitted by these phosphors 5R to 5B is After passing through the FOR 2, the photosensitive recording material 6, which is in close contact with the front surface of the FOR 2 and moves, for example, upward, is subjected to color exposure.

FIG. 3 shows the above-described FOTI driving method in correspondence with a color image signal PS for a raster scan type display. The electron beam 4 from the electron gun 3 is FO
The red phosphor 5R, green phosphor 5G, and blue phosphor 5B formed in a band shape on the back surface of R2 are scanned across in synchronization with the deflection signal of the input image signal, and when passing through this phosphor screen 5, Color image signals 5R-3R corresponding to the phosphors 5R-5B of each emission color are selected, and brightness modulation is performed using the selected image color signals PS. That is, during the time period tO to t1 during which the electron beam 4 scans the red phosphor 5R, the red component image signal SR is selected and modulated into an electron beam current, causing the red phosphor 5R to emit light, thereby exposing the photosensitive material 6. Ru. Thereafter, in the same manner, the time tl-t during which the electron beam 4 scans the green light emitter 5G and the blue light emitter 5B
2 and t2 to t3, the green component image signal SG,
The blue component image signal SB is selected to brightness-modulate the electron beam current. As a result, image signals 5R-5G-9B are recorded on the photosensitive material 6 in chronological order. In this way, the image color signal PS indicates the image signals 5R-5R that are selectively combined in synchronization with the scanning position of the electronic beam A4, and brightness modulation in the FOT I is realized by this image color signal PS.

Next, the principle of color recording using the above-mentioned FOTI will be explained with reference to the drawings of FIGS. 4 to 6.

Figure 4 shows a raster scan type still color image + OA displayed on a color CRT.
A rectangular part 10B of 0A is sampled according to the raster scan and displayed on FOP2 of the above-mentioned FOT1 as shown in FIG. The display image on this FOP2 is red,
It is color-coded into three bands of blue and green, and its brightness is modulated by image signals (SR-5R) of separated colors corresponding to the respective phosphors 5R, 5G, and 5B. Furthermore, the color still image +OA is a red phosphor 5R formed in a band shape on the FOP2.

A part of the still image 9108 is displayed on the green phosphor 5G and the blue phosphor 5B, shifting the required pixels in a fixed direction 11 like an electronic bulletin board. Therefore, the moving image displayed on FOP2-F of FOT1 is transferred to the color photosensitive material 6 as shown in FIG.
is brought into close contact with the front surface of the FOP 2, and the photosensitive material 6 is exposed to light while being moved in a predetermined direction 11 at the same speed as the movement of the displayed image. Therefore, for example, red phosphor 5R
When the brightness-modulated electron beam 4 traverses the photosensitive material 6, only the information of the inner red part of the input image signal is recorded as a latent image. Similarly, the color photosensitive material 6 is exposed to green and blue image information in color-coded strips, and by moving the photosensitive material 6 in synchronization with the displayed image and recording them in an overlapping manner, the photosensitive material 6 is One completed color latent image will be exposed.

Incidentally, the sensitivity characteristics of the FOTI and the photosensitive material 6 vary depending on each color, and there is a problem in that high-quality image output cannot be obtained if exposed in the same way. In addition, in FOTI scanning described in -, the image signal is decomposed into RGB for each pixel and the phosphor is emitted, so when horizontal deflection is performed continuously, the RGB data of one pixel is Woodworking V as shown in Fig. 7(A).

Although they are outputted separately in the direction H, there are relatively few problems because they are exposed at equal intervals. However, RGB
If the light emission times of the two light sources are different, the deviations will be at irregular intervals as shown in FIG. 7(B), which is disadvantageous. If the vertical and horizontal deflections were processed analogously, there would be no degree of freedom such as changing the light emitting time for each color.
This means that advantages such as being able to programmable the size of the image will not be realized.

(Object of the invention) This invention was made under the above circumstances,
It is an object of the present invention to provide a method for generating a deflection signal for a color FOT, which performs efficient deflection by digitally performing vertical deflection and horizontal deflection with respect to the FOT, and storing data in advance in a lookup table. The purpose is

(Structure of the Invention) The present invention provides a single electron gun type color F having a screen formed by coating a plurality of phosphors of different emission colors in a band shape.
For the OT, the scanning electron beam is vertically deflected in the short side direction of a plurality of phosphors and horizontally deflected in the long side direction, and the vertical deflection position and horizontal deflection signal are each tabulated and digitally recorded. It is characterized by being deflected.

(Embodiment of the Invention) In this invention, as shown in FIG.
The R2 green phosphor 20B and the blue phosphor 20B are scanned vertically in the vertical direction V as scanning lines SC1→SC2→SC3, and the entire screen is scanned by moving the scanning lines in the horizontal direction H using blanking BL. That's what I do.

Here, in this invention, as shown in FIG. 9, the length xl of each of the phosphors 20R to 20B is divided into times 10 to t12 and deflected in the water direction H, and the horizontal deflection is discontinuous. It is shaped like a staircase. That is, time tO
~tl, for example, RGB by scanning line SCI in FIG.
After the horizontal deflection, from t1 to t2, RGB scanning is performed using the scanning line SC2 in FIG.
Sequential time t2-t3. t3-t4. . . . vertical deflection of scans JSC3°SC4, .

Then, in the blanking BL of FIG. 8, the step of the horizontal deflection signal is increased to deflect the electron beam 4 in the horizontal direction H. However, in this invention, the electron beam 4 is deflected particularly at both ends of the phosphors 20R to 2QB. I'm trying to reduce the speed. As is clear from the structural diagram in Figure 1, this is the result of FOT
The FOP2 of I is a flat band-shaped plate, and the electron beam 4
This is because if the electron beam 4 is deflected horizontally at a constant velocity, the velocity of the electron beam 4 will be high at both ends of the FOP 2 and slow at the center, making it impossible to accurately reproduce an image on the FOR2. Therefore, by slowing the deflection speed of the electron beam 4 at both ends of the FOP 2 and relatively fast at the center, the image displayed on the FOR 2 is always horizontally deflected at the same speed.

In this invention, the vertical RGB scanning time, that is, the emission time, is changed for each color, and the emission time for red and green, to which the sensitivity of the photosensitive material is relatively low, is increased, and the sensitivity of the photosensitive material is relatively low. The emission time for good blue light is relatively short. In this way, RGB scanning in the vertical direction is performed in a straight line, and the emission time is changed depending on the color, so when the output image of FOT I is recorded on the photosensitive material 6 that is in close contact with its surface,
An accurate image will be output onto the photosensitive material 6. In other words, since each RGB scanning line is scanned vertically, even if one pixel is separated into RGB colors and deflected, the photosensitive material 6 will be horizontally shifted as shown in FIG. 7(A). Never exposed to light. In addition, phosphors 20R to 20B
Since the light emitting time is varied, the amount of brightness can be adjusted according to the sensitivity of the photosensitive material 6, and each color can be exposed under the same conditions.

In this case, it is possible to control the luminance signal level by keeping the emission time the same for each color, but considering the variation in sensitivity characteristics, a range of about 103 to 105 must be prepared, and the hardware The burden increases. Therefore, depending on the case, both the light emission time and the brightness signal level may be controlled.

FIG. 10 is a diagram showing an example of an apparatus for realizing the principle of the present invention, in which the electron beam 4 is directed to a phosphor 20R that is to be emitted.
The vertical deflection signal VD, which determines the position of 20B, is applied to the deflection plate 21A of the FOT 21 via the switch 23, and the horizontal deflection signal HD is similarly applied to the deflection plate 21A of the FOT 21. Then, the image signal decomposed into RGB, that is, the brightness signal BS, is inputted to the gate 25 via the switch 24, and the blanking signal BL for commanding blanking is also inputted to the gate 25, and the brightness signal PS from the gate 25 is inputted to the gate 25.
is applied to the cathode 2+B of the FOT 21. Further, a photosensitive material 22 is closely attached to the front part of the FOT 21,
For example, it is conveyed in the direction shown in the figure.

Note that the switches 23 and 24 are configured to be switched in conjunction with each other, so that, for example, the vertical deflection signal vO is
When scanning the red phosphor 20R connected to
As for the brightness signal BS, a red brightness signal is also input through the contact a, and is applied to the cathode 2+8 through the gate 25 as the brightness signal PS at this time. The same is true for contacts S and C.

With this configuration, for example, in the scanning line SCI of FIG. 8, the phosphor 201' is
? is specified, the red signal of the brightness signal BS is input to the gate 25 through the contact d of the switch 24, but in this case, since the blank signal BL is not input, the red signal is output from the gate 25. A brightness signal BS of is applied to the cathode 21B of the FOT 21 as an image signal Ps. In this case, since the horizontal deflection signal HD also has the horizontal characteristic part shown in FIG. 9, the scanning line SCI is not deflected in the horizontal direction H, and the switches 23 and 24 are the contacts a of the phosphor 20R. It will only emit light for a limited time. Then, when the switches 23 and 24 are successively changed to the b contact, the deflection position according to the vertical deflection signal VD is inputted to the deflection plate 21A as the green phosphor 20G, and the brightness signal BS
A green luminance signal is applied to the cathode 21B as an image signal PS through the contact point S. As a result, the phosphor 20G of the FOT 21 emits light in response to the green luminance signal BS. In this case as well, the phosphor 20G emits light only while the switches 23 and 24 are in the b contact. The same applies to the blue phosphor 20B, and the emission of the phosphor 20B is tIJ! , r, the blank signal BL is inputted from the iM's system to the gate 25, and the image signal ρ
The application of S to the cathode 21B is cut off, and the horizontal deflection signal HD applies the step voltage shown in FIG. 9 to the deflection plate 21A, whereby the scanning line is horizontally deflected to the scanning line SC2 position shown in FIG. Similarly, the phosphors 20R to 20B sequentially emit light on the scanning line SC2, and the same scanning is repeated and the phosphors 201 to 20B emit light in sequence.
The entire 0B will be scanned.

FIG. 11 shows an example of the circuit configuration of a device that realizes the present invention, in which image information PI decomposed into RGB is converted into a digital quantity by an An converter 31 via a multiplexer 30, and then stored in a buffer memory 32. For example, frame information for one screen or line information for one scanning line is stored in the buffer memory 32. The timing generation circuit 33 outputs a power control signal CD for outputting the stored RGB image signals, a blank signal BLC for instructing blanking, and a pixel clock PCK, and the pixel clock PCK is output from the address generation circuit. 34 and buffer memory 32
．． Lookup table 4 storing vertical deflection signals
It outputs a pixel address PA for accessing a lookup table 41 that stores 0 and horizontal deflection signals, and the RGB image information accessed from the buffer memory 32 is subjected to DA conversion via a multiplexer 35. The signal is converted into analog HlpTo by the converter 42 and then input to the gate 46. Further, the ROB position information accessed from the look-a-mb table 4o is sent to the DA converter 43 via the multiplexer 3G to the analog quantity VI.
The horizontal deflection signal old is converted into D and applied to the deflection plate 21A of the FOT 21 as the vertical deflection signal VD via the amplifier 45, and accessed through the lookup table 41.
After being converted into an analog quantity HD by the A converter 44, it is applied to the deflection plate 21A of the FOT2+ as a horizontal deflection signal HD via an amplifier 47. The lookup table 4o stores position information as a vertical deflection signal as shown in FIGS. 8 and 9 corresponding to the phosphors 2OR, 20G, and 20B, respectively.
1 stores a horizontal deflection signal shown in the step characteristic of FIG. 9 as a digital value. Further, the output of the gate 46 is applied to the cathode of the FOT 21 as a brightness signal PS.

In such a configuration, the image information PI is decomposed into RGB for each pixel and sent to the multiplexer 30 in a predetermined order.
The data is then converted into a digital value by an AD converter 31, and then stored in a digital memory 32. After all the information has been stored in the panzer memory 32, the timing generation circuit 33 outputs a color control signal CD controlled by the RGB luminance time as shown in FIG. DA converters 42 and 43 read signals for each RGB from the buffer memory 32 and lookup table 40 and convert them into analog quantities.
It is designed to be transmitted to Here, the timing generation circuit 33 outputs the pixel clock PCK in response to the color control signal CD, so that the address generation circuit 34 generates the pixel address PA, and the address generation circuit 34 generates the pixel address PA.
Lookup table 40 and lookup table 4
I am trying to synchronize between 1 and 1. That is, when the image information R is accessed from the buffer memory 32, the lookup table 40 must also output the position signal R corresponding to the red color information, and the lookup table 41 must output the position signal R corresponding to the red information. A level signal according to the characteristics shown in FIG. 9 is output. In this way, the image information accessed from the buffer memory 31 is converted into analog 4i PID by the DA converter 42 via the multiplexer 35 for each RGB, and then sent to the gate 46.
, and the blank signal BLC is not output from the timing generation circuit 33, the image signal P is input as it is.
Since the signal S is applied to the cathode 21B of the FOT 21, it is possible to perform image scanning in advance as shown in FIG. That is, position signals corresponding to the positions of the RGB phosphors 20R to 20B are accessed from the lookup table 40, passed through the multiplexer 36, converted to an analog quantity VID by the DA converter 43, and then deflected via the amplifier 45. The voltage is applied to the plate 21A, and the look-up table 41 is similarly applied.
The horizontal deflection signal H1 from the horizontal deflection signal H1 is also converted into an analog signal by the DA converter 44 and applied to the deflection plate 21A via the amplifier 47, so that image scanning as shown in FIG. 8 is performed. I can do it.

On the other hand, FIG. 12 shows an example in which the look-up table 40 or 41 according to the present invention is constructed from a RAM 50.
Necessary information is written via the data bus DB from the RAM 50, and the write address of the RAM 50 is
The CPU is sent to a predetermined address via the address bus AB and the address circuit 52 from Pu, or via the address circuit 52 by the pixel address PA from the scanning device.
Information from is written therein, and the write mode is switched by a mode switching signal MS. and.

Reading of data from the RAM 50 is also performed by the address bus AB from the CPU or the pixel address PA from the scanning device, and the accessed information is transferred to the bidirectional buffer 5.
1 and then converted into an analog quantity by a DA converter 53 before being output.

Furthermore, FIG. 13 shows an example in which the lookup table is configured with ROMs, and in this example, three ROMs 80
62 in advance, data stored in the ROMs 80 to 62 is read out via a switching circuit 83, and the read data is converted into a digital amount by a DA converter 64 and output.

By preparing a lookup table configured in RAM or ROM in this way, vertical deflection signals and horizontal deflection signals can be stored as digital values, and when the lookup table is configured in RAM, It is possible to rewrite the information arbitrarily, and R
Even in the case of an OM configuration, if information is written in a plurality of ROMs and can be selected, it becomes possible to freely select and use any table.

(Effects of the Invention) As described above, according to the deflection signal generation method of the present invention, since the horizontal deflection and vertical deflection data are stored in a table in advance in a memory etc., the deflection operation can be performed efficiently. This has the advantage that table data can be changed freely.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing the schematic configuration of the FOT targeted by this invention, Figs. 2 (A) and (B) are front and side views of the FOP, and Fig. 3 is for explaining an example of the operation of the FOT. diagram,
4 to 6 are diagrams for explaining the scanning state of the FOT, FIGS. 7(A) and (B) are diagrams for explaining the output state of RGB pixels, and FIG. 8 and FIG. Figure 9 is a diagram for explaining the principle of the scanning deflection method of the present invention, respectively.
FIGS. 10 and 11 are block diagrams showing an example of a device using the present invention, and FIGS. 12 and 13 are block diagrams showing an example of a look-up table according to the present invention. 1.21...FOT, 2...FOP, 3...electron gun, 4...electron beam, 5...phosphor screen,
5R, 5G, 5B...phosphor, 8.22...photosensitive material, 30.35.38...multiplexer, 32
...Buffer memory, 31...AD converter, 42-
44.53.64...OA converter, 40.41...
Look amplifier table, 50...RAM, 60~
62...ROM. Applicant's agent: Yu Yasugata 3. Written amendment January 30, 1980 1. Indication of the case 1988 Patent Application No. 230247 2. Title of the invention Color FOT deflection signal generation method 3. Person making the amendment Related Patent applicant: 210 (520) Nakanuma, Minamiashigara City, Kanagawa Prefecture Fuji Photo Film Co., Ltd. 4, Agent: Nomura Building 7F, 18-16 Nishi-Shinjuku-chome, Shinjuku-ku, Tokyo
Telephone (348) 77057877 Patent Attorney Yuzo Yasugata 5, "Detailed Description of the Invention" column 8 of the specification to be amended, the statement of contents of the amendment, page 7, line 18, states "green phosphor 20B" is corrected to "green phosphor 20G".

Claims (4)

[Claims] (1) A scanning electron beam is vertically deflected in the direction of the short side of the plurality of phosphors for a single electron gun type color FOT having a screen formed by coating a plurality of phosphors with different emission colors in a band shape. and horizontally deflect in the long side direction,
A method for generating a deflection signal for a color FOT, characterized in that the vertical deflection position and the horizontal deflection signal are each made into a table and deflected digitally. (2) A color FOT deflection signal generation method according to claim 1, wherein the vertical deflection position and the horizontal deflection signal are each stored in a table in a ROM. (3) A color FOT deflection signal generation method as set forth in claim 1, wherein the horizontal deflection signal is made rewritable by converting it into a table in RAIII. (4) Deflection signal generation for the color FOT according to claims 1 to 3, wherein the horizontal deflection signal is deflected at a relatively slower speed at both ends of the phosphor than at the center. Method.