JPH0417498B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a one-dimensional scanning cathode ray tube (including an optical fiber tube) equipped with a striped light emitting section capable of emitting light in each color of red, green, and blue. The present invention relates to an image recording apparatus using an exposure means.

(Prior Art) As one of the color image recording apparatuses using a one-dimensional scanning cathode ray tube, one having the configuration shown in FIG. 1 is known. This consists of cathode ray tubes 1, 2, and 3 whose fluorescent surfaces are coated with red, green, and blue phosphors, respectively.
The red light, green light, and blue light respectively output from the cathode ray tubes 1, 2, and 3 are superimposed by a combining prism 4, and then transmitted through an imaging lens 5 and an inclined reflection mirror 6. It is configured such that the light is incident on the film (exposed area) 7. Incidentally, reference numeral 8 in the figure is a stage that is moved left and right by a step motor (not shown), and the mirror 6 and film 7 are placed on the stage 8 and moved to perform a secondary investigation. However, this recording apparatus requires three cathode ray tubes 1 to 3, and has the disadvantage that the scale of the apparatus becomes large.

Another known conventional device uses a single cathode ray tube whose surface to be scanned by the electron beam is painted striped with phosphors in three colors: red, green, and blue. It is being In this recording apparatus, in order to perform exposure for each color separately, the exposed portion is repeatedly conveyed three times, and at each time of conveyance, exposure is performed based on image data of the corresponding color, thereby obtaining a color image. Although this recording device eliminates the drawbacks of the conventional device, the mechanism for returning the exposed area to its initial position and conveying it again so that the images of each color are overlapped is complicated, and the device is large. . Moreover, despite this increase in size, the deviation of the exposure position due to the three-color light is still large, making it impossible to obtain a good color image.

Furthermore, the fluorescent surface of a cathode ray tube, such as an optical fiber tube, used in this type of image recording apparatus is a flat surface. For this reason, the distance between the electron gun that emits the electron beam and the exposure surface is smaller at the center fluorescent surface and larger at the edges, resulting in the problem of uneven brightness, where the brightness of the tube surface is naturally high at the center and low at the edges. There is. However, the inherent brightness unevenness caused by this structure can be solved by a method of controlling the grid voltage to a predetermined value in synchronization with the scanning of the electron beam, that is, by increasing the grid voltage when scanning the edge, or by using a photo sensor. This can also be removed by measuring the brightness during scanning, creating a brightness correction signal based on this information, and changing the grid voltage to make the brightness at the center and edges constant. On the other hand, the brightness unevenness includes brightness unevenness caused by the uneven coating of the other phosphors mentioned above. This brightness unevenness cannot be satisfactorily resolved even by the above two methods. This is because uneven coating of the phosphor appears as irregular and very fine unevenness in brightness, so of the above two methods, the former method cannot deal with it at all, and even the latter method has problems due to the resolution of the photo sensor. This is because there are limits. Such brightness unevenness also occurs due to non-constant electron beam sweeping speed, and in either case,
This results in uneven light intensity on the photoreceptor. Further, in the case of an optical fiber tube, variations in the amount of transmission due to the condition of the end face of the optical fiber also cause unevenness in the amount of light.

With the current technology, as mentioned above, it is difficult to remove fine unevenness in the amount of light, and for this reason, when obtaining a hard copy using this type of image recording device, there is no problem with binary images, but Particularly when obtaining a hard copy of a gradation image, a major problem arises. That is, on a two-dimensional image recorded by moving the exposed area in the sub-scanning direction, unevenness in the amount of light in the primary scanning direction appears as streaks in the sub-scanning direction, causing a problem in which the image area is significantly deteriorated. There is.

(Purpose of the Invention) The present invention was made in view of the above-mentioned problems.The purpose of the present invention is to use a single cathode ray tube, transport the exposed area only once, and avoid the above-mentioned streaks. The first object is to provide an image recording device that can produce good color images.

(Configuration of the Invention) The configuration of the present invention that achieves this objective includes red, green,
In an image recording apparatus using a one-dimensional scanning cathode ray tube as an exposure means, which is equipped with a striped light emitting section that can emit light of each color of blue at a predetermined scanning interval, a fluorescent surface corresponding to each color of the cathode ray tube is provided. Scanning is performed for a unit scanning cycle by sequentially switching positions at equal intervals l on the optical surface for each scanning line, and the scanning line positions on the fluorescent surface corresponding to each color of the cathode ray tube by the electron beam are , on the fluorescent surface corresponding to each color,
so as to be shifted by a certain amount (Δx) in a direction perpendicular to the one-dimensional scanning direction for each unit scanning cycle,
an electron beam deflection means for controlling the electron beam; a conveyance means for sending the exposed portion in a direction substantially perpendicular to the one-dimensional scanning direction of the electron beam; and exposure for each color during exposure by the deflection means. The apparatus is characterized in that a control means for driving the conveying means to continuously convey the exposed area so as to overlap the exposed area is provided.

(Embodiments) Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 2 is a configuration diagram showing an embodiment of the present invention. In the figure, 11 is a one-dimensional scanning cathode ray tube, here an optical fiber tube is shown.
The fluorescent surface portion of this cathode ray tube 11 is shown in FIG.
As shown in the AA arrow view of the figure, the red phosphor 11a, the green phosphor 11b, and the blue phosphor 11c are also painted in a striped pattern. When each of the phosphors 11a, 11b, and 11c forming this striped light emitting section is scanned by an electron beam, it generates red light, green light, and blue light, respectively, and this light passes through the optical fiber 11d to the exposed area. 12. The exposed portion 12 is composed of, for example, an instant film or various photosensitive films (photoreceptors). This film is preferably composed of a diffusion transfer photosensitive material. The diffusion transfer photosensitive material referred to here is, for example, one constructed as an instant type film, and the film uses a reversal emulsion in the photosensitive layer, and a dye and a diffusion-resistant group are bonded under each photosensitive layer. dye laser (dye−
The silver halide in the exposed areas is not developed because it is a reversal emulsion.
The silver halide in the unexposed area is reduced by the developer, and at the same time the developing agent is oxidized, and due to the action of this oxidation product and alkali, the dye is released from the dye laser and the diffusible dye is diffused and transferred to the image-receiving layer. It combines with the chelate compound in the image-receiving layer to form a positive dye image. Using this film, processing can be carried out in a short time, and the resulting photographs have excellent resolution, color reproducibility, etc., and are of the same quality as general silver halide films.

13 is an eccentric coil of the cathode ray tube 11, where the electron beam emitted from the electron gun is deflected vertically and horizontally. A horizontal deflection signal and a vertical deflection signal applied to the deflection coil 13 are shown as a and b in FIG. 4, respectively. In FIG. 4, _T1 is an effective scanning period, _T2 is a blanking period, and R, G, and B are effective scanning periods when red, green, and blue image data are respectively provided to the cathode ray tube 11. It shows. The vertical deflection signal in Figure 4b is the sum of the signals in Figures 4c and d, and the baseline increases stepwise by Δh every time a total of three unit scans are performed, one for each color. Also, the horizontal deflection signal is R,
The interval between scanning lines on the fluorescent surface by the electron beam during periods G and B (within the same unit scanning cycle) is selected to be 1 (mm) as shown in FIG.
Of course, each scanning line for each color is a phosphor 11.
a, 11b, and 11c. For example, at the start, the scanning line of each color is located at the upper end of each area of the light emitting surface in Figure 3 (i.e., x = 0 for red light, x = 0 for green light).
=l, the blue light is at the position x=2l), and as the exposed portion 12 is transported, the scanning line position of each color is shifted in the direction perpendicular to the one-dimensional scanning direction,
Δh is set so that the scanning line position of each color moves to the positions x=l, x=2l, and x=3l at the time when the conveyance of the exposed part 12 is finished (the time when the recording of the color image is finished). value is selected.
Of course, the opposite may be true. That is, the amount of deviation Δx (mm) for each unit scan is set to be Δx=l/M when each image is composed of M scanning lines for each color. For example, l=2, M=
1000, Δh is selected so that Δx is 2 μm.

Returning to FIG. 2 again, 14, 15, 16 are frame memories;
6 stores image data for exposure with red light, green light, and blue light, respectively, and the data in each frame memory 14 to 16 is selected by a multiplexer 17 and sent via a D/A converter 18. The signal is input to a cathode ray tube 11.

Here, the direction of conveyance of the exposed portion 12 is the downward direction (arrow direction) in FIG. 2, and the conveyance speed is constant. Further, data read from the frame memory 14, 1516 is stored in the frame memory 14.
When outputs data corresponding to the i-th scanning line as red scanning line data, the frame memory 15 outputs data corresponding to the i-kth scanning line as green scanning line data, and the frame memory 16 outputs data corresponding to the i-th scanning line as green scanning line data. The i-2kth data is output as follows, where k is a constant determined by l, etc., and the data of each color at the same position of the original image is given to the same position of the exposed part 12. It is selected by

According to the above configuration, while the exposed part 12 is conveyed downward in FIG. 2, first one scanning line of red image data, then one scanning line of green image data, and then one scanning line of blue image data. It is repeatedly exposed to a cycle of one scanning line. For this reason, the exposed portion 1
At the position exposed based on the red image data on 2 above, exposure based on the green image data is superimposed on the kth cycle, and further exposure based on the blue image data is superimposed on the 2kth cycle. Ru. Then, the exposure using the three color lights at the position is completed. Such exposure is performed over the entire surface of the exposed portion 12, and a color image is obtained by development. In this case, it is possible to substantially eliminate deviations in the exposure position due to the three-color light, so that a good color image can be obtained. Further, according to the above configuration, the scanning line position within the same color moves in a direction perpendicular to the scanning line as recording is performed. Therefore, the unevenness of the amount of light in each scanning line is different each time due to its randomness, and the above-mentioned streaks do not occur.

In the above embodiment, three color phosphors 11a to 1
The case is shown in which an optical fiber tube is used in which striped light emitting portions are formed by painting 1c in a striped manner.
As shown in FIG. 5a, a general white phosphor is used as the phosphor, and red, green, and blue color filters 11e, 11f, 11g are arranged on the tube surface (in this case, the surface of the optical fiber 11d). It is also possible to use a striped adhesive. In addition, as shown in FIGS. 5b and 5c, the self-ox lens array 20 is not a non-focusing light transmitting body array such as an optical fiber, but a converging light transmitting body array.
The exposure optical system may be constructed using the following. (still,
FIG. 5b shows red, green, and blue phosphors 11a, 11b,
Cathode ray tube 1 with 11c applied in stripes in the scanning direction
1 is used, and FIG. 5c shows red, green, and blue color filters 11e and 11 extending in the scanning direction.
The case is shown in which a cathode ray tube 11 whose tube surface is covered with f, 11g is used). Furthermore, an optical system using one large lens may be used as long as the loss of light quantity is acceptable.

Furthermore, although the above embodiment has been described with respect to an apparatus having a frame memory, as shown in FIG.
A delay circuit that simultaneously receives red, green, and blue image data at the same position of the original image, inputs the red image data directly to the multiplexer 17, and delays the green image data by an amount equivalent to k scanning lines. 21
Blue image data may be input to the multiplexer 17 via a delay circuit 22 that provides a delay equivalent to 2k scanning lines. Of course, if the input image data from the outside is delayed from the beginning, these delay circuits are not necessary.

Furthermore, the direction in which the exposed portion is transported may be reversed, and the direction in which the scanning line position is shifted may be reversed.

Further, although the above description has been made regarding the case where one vertical deflection is performed in one image recording, it is not necessarily limited to this relationship. In this case, when the vertical deflection reaches the end and returns to the starting position, the recording position of the exposed area shifts, but this can be solved by controlling the transport system.

(Effects of the Invention) As described above, according to the present invention, it is possible to realize an image recording device using a single cathode ray tube, which does not produce streaks and can obtain good color images. Furthermore, since only one transport is required, the transport mechanism becomes simple.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a conventional image recording apparatus of this type, FIG. 2 is a block diagram showing an embodiment of the present invention, FIG. 3 is a view taken along arrow A-A in FIG. 2, and FIG. FIG. 2 is a waveform diagram of a deflection signal used in the device, and FIGS. 5 and 6 are explanatory diagrams of other embodiments of the present invention, respectively. 1 to 3, 11...Cathode ray tube, 4...Synthesizing prism, 7...Film, 12...Exposed portion, 13...
...Deflection coil, 14-16...Frame memory,
17... Multiplexer, 18... D/A converter, 20... Self-cleaning lens array, 11a
~11c...fluorescent body, 11d...optical fiber, 11e~11f...color filter.

Claims (1)

[Scope of Claims] 1. In an image recording device whose exposure means is a one-dimensional scanning cathode ray tube equipped with a striped light emitting section capable of emitting red, green, and blue color light at predetermined scanning intervals, wherein the cathode ray While sequentially switching positions at equal intervals l on the fluorescent surface corresponding to each color of the fluorescent surface of the tube for each scanning line, scanning is performed for a unit scanning cycle, and at the same time, the electron beam corresponds to each color of the cathode ray tube. The electron beams are adjusted so that the scanning line position on the phosphor surface corresponding to each color is shifted by a certain amount (Δx) in the direction perpendicular to the one-dimensional scanning direction for each unit scanning cycle. an electron beam deflection means for controlling the beam; a conveyance means for sending the exposed area in a direction substantially perpendicular to the one-dimensional scanning direction of the electron beam; and during exposure by the deflection means, the exposed area is exposed by each color. An image recording apparatus comprising: a control means for driving the conveyance means to continuously convey the exposed portion so as to overlap with each other.