JPS5924425B2 - Character signal generator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a scanning type character signal generating device which obtains a character signal by scanning an image of characters, symbols, etc. (hereinafter simply referred to as characters) with an electron beam or a light beam. This invention relates to an improvement in a character signal generating device that corrects the scanning position using a signal obtained by scanning position marks applied to each image in advance so as to accurately scan a desired character pattern. It is something.

A character signal generator that scans a character image with a beam of light or electrons to obtain a desired character signal includes: (1) scanning a character image on a dial with a scanning image projected on a cathode ray display tube; (2) There is a flyshida spot method in which a desired signal is obtained by photoelectrically converting the light flux transmitted or reflected from the character image, and (2) a target on which various character images are formed in advance is scanned with an electron beam. Various types are known, such as (3) monoscope tube type, which is designed to capture images, and (3) type that obtains signals by scanning character images projected on the front surface of the image pickup tube with an electron beam. In any case, it is a prerequisite to accurately scan the character image during imaging to obtain a highly accurate character signal, and one way to achieve this is, for example, by scanning the character image area 1 as shown in Figure 1. Correspondingly, a position mark 2 is provided at one corner of the position mark 2, and the deflection signal for image scanning is corrected using the position signal obtained by pre-scanning the position mark 2 in advance to accurately locate the desired character image area 1. The technology that enables scanning is disclosed in Japanese Patent Application No. 52-26367 (1983), which is filed by the present applicant.
JP-A No. 53-111276).

However, in the conventional position mark 2, 1
To obtain the desired position signal through the preliminary scanning, it is necessary to perform at least two scans.In order to improve the position detection accuracy in the direction perpendicular to the two-scanning direction, the scanning line must be There is a drawback that more time than necessary is wasted due to the need to further increase the density of the image, or to repeat scanning again in the vertical direction.

The present invention was made in view of the problems of conventional character signal generators of this type, and corrects the deflection position using a signal obtained by preliminary scanning of position marks made in correspondence with character images. In a character signal generating device which obtains a character signal by scanning a desired character image with light or an electron beam,
A position formed by a character image accommodated in a rectangular area and two mutually orthogonal sides whose intersection is a point B shifted by a predetermined value 1) X, Dy in the horizontal and vertical directions from an arbitrary corner point A of this area. A dial containing a mark, a means for preliminary scanning with a beam so as to intersect two sides of the position mark with a straight line, and detecting mark signals MMSa and MSb corresponding to the intersection points A and b with the two sides, and the mark; The displacement amounts ΔX and Δy of the preliminary scanning start point C of the beam with respect to the intersection B of the position marks are determined based on the detection timing of the signals MSa and MSb, and these are added as correction amounts to the X and Y deflection signals of the character image area scanning beam. and a deflection signal generating section that transmits the deflection signal to the deflection circuit.

The following explanation will be based on an example using an image pickup tube.
The present invention is not necessarily limited to this, but can be applied to character signal generating devices of the various types described above. FIG. 2 is a schematic diagram showing an example of a phototypesetting machine using the character signal generating device according to the present invention, in which numeral 4 shows various character images and keys (for example, 5 is a light source, 6 is a photographic optical system, 7 is an image pickup tube, 8 is a cathode ray display tube, 9 is a projection optical system, 10 is a photosensitive material, 11 and 12 13 is a deflection circuit, and 13 is a control unit, which selectively illuminates a desired character with the light source 5 and transfers the image and its corresponding position mark to the image pickup tube 7.
After the projection and accumulation, the position mark is first scanned by a preliminary scan, and the mark signal MS obtained at that time is inputted to the control section 13 via the line 14 to obtain the desired correction amount. The two deflection circuits 11 and 12 are operated while correcting the deflection signal for scanning the image area based on the obtained correction amount, and the control is performed according to the character signal output from the image pickup tube 7 via the line 15. A desired character image is reproduced on the polar ray display tube 8, and the reproduced image is projected onto the sensitive material 10 for printing.

FIG. 3 shows a position mark 3 used in the device according to the present invention.
1 and the relationship between the character image area 32 corresponding to the mark 31 and the state of the scanning line 33 that pre-scans the position mark 31. FIG. FIG. 3 is a diagram showing the relationship between the change in the position mark Sy) and the mark signal MS output by detecting the position mark 31 through the preliminary scan.

As is clear from FIG.
The intersection point is a point B that is shifted by a predetermined value Dx, Dy in the vertical direction, and a position mark 31 in the shape of, for example, a key (") having two sides extending in the horizontal and vertical directions is attached to each character image. In the preliminary scanning, scanning is performed in an oblique direction so as to intersect each of the two sides of the position mark, as shown in the scanning line 33 shown in the figure.

Mark signals MSa and MSb are output as shown in FIG. 4, corresponding to the intersections A and b between the scanning line 33 and each of the two sides of the position mark 31. By the way, in order to simplify the explanation, it is assumed that the scanning line 33 starts from point C and draws a trajectory at 45 degrees to the horizontal axis, and the distance from point C to point B is assumed to be ΔX and Δy as shown in the figure. . The position of point C is the scanning point D (Sx, Sy) at t=0
Therefore, after determining the values ΔX and Δy by the preliminary scanning, when scanning the desired area 32, x
={Sx(t=0)+Dx+x(t)DΔX...
-1Y={Sy(t=0)+Dy+y(t)}+Δy, where x(t) and y(t) are displacement positions required to scan the image area 32.

Dy is a negative value in the case of Figure 3. The beam can be deflected according to the following function.

The control unit 13 in FIG. 2 has a function of receiving the mark signals NSa and MSb via the line 14 to obtain ΔX and Δy, and thereby outputting a signal defined by the formula 1. An example of a specific configuration will be briefly described below based on the block diagram of FIG.

In FIG. 5, 51 has a function of generating the coordinate values (Sx, Sy) necessary for performing preliminary scanning and the x(t), y(t) signals necessary for scanning the character image area. A deflection signal generating section 52 outputs the X and Y signals calculated based on Equation 1 above, and a deflection signal generating section 52 receives a clock signal sent via a line 53 in synchronization with the generation of the deflection signal for preliminary scanning. A counter for counting, 54 is a mark signal detector, and 55 and 56 are registers. When the mark signal detector 54 detects the mark signal MSa, it causes the value of the counter 52 at that time to be loaded into the register 55,
Further, when the mark signal MSb is detected, the value of the counter 52 at that time is taken into the register 56. By the way, since the counter 52 counts the clock signal output in synchronization with the generation of the preliminary scanning deflection signal as described above, the values taken into the registers 55 and 56 are as shown in FIG. The value corresponds to Δy. Then, the deflection signal generating section 51 inputs the values set in the registers 55 and 56 in the preliminary scanning process as described above, thereby generating a deflection signal
, Y, thereby allowing accurate scanning of the character image area 32. Incidentally, in the embodiments described above, a case has been described in which a value detected using a counter or the like is used as a correction value, but the embodiments of the present invention are not limited to this, and for example, It is also possible to use the values shown as Ex and Ey in FIG. 4 as correction values. Furthermore, in the above explanation, one position mark is provided at the upper left of one character image, but the present invention is not limited to this. For example, each position mark is Separately defined for character images (i.e., the Dx
, Dy values are known).
Furthermore, the correspondence between position marks and character images may be determined by providing multiple position marks for one image, or conversely by providing one position mark for multiple images, depending on the character storage density and position accuracy allowed on the dial. It is also possible to provide two position marks.

Further, the shape of the position mark in the present invention may be any shape as long as it has two sides provided to intersect with the preliminary scanning line, and may take various shapes, for example, as shown in FIG. things are possible. As described above in detail, the present invention makes the shape of the position mark applied corresponding to the character image to be a shape having two sides orthogonal to each other, and the position mark is formed in a diagonal direction so as to intersect each two sides of the position mark. The device of the present invention is characterized by detecting the desired correction amount according to the timing of the mark signal obtained by preliminary scanning. It is possible to detect the desired correction amount in a short time by simply scanning one time without repeating such repeated scanning, and the position detection accuracy does not have the disadvantages of the conventional device as mentioned at the beginning.
By performing one preliminary scan, it is possible to detect the position (that is, detect the correction amount) with the same precision in both the vertical and vertical directions.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a conventional preliminary scanning state, FIG. 2 is a diagram showing an example of a phototypesetting machine using the apparatus according to the present invention, and FIG.
The figure is a diagram showing the state of preliminary scanning in the device of the present invention.
The figure shows the relationship between the coordinate values of the scanning point and the mark signal in the preliminary scanning state shown in FIG. 3, FIG. It is a figure which shows the example of various shapes. 31...Position mark, 32...Character image area, 33...Scanning line for preliminary scanning.

Claims (1)

[Claims] 1. A character signal in which the deflection position is corrected by a signal obtained by preliminary scanning of a position mark made corresponding to a character image, and a character signal is obtained by scanning a desired character image with a light or electron beam. The generator consists of a character image accommodated in a rectangular area and two mutually orthogonal sides whose intersection is a point B that is shifted by a predetermined value DX, Dy in the horizontal and vertical directions from an arbitrary corner point A of this area. means for pre-scanning with a beam so as to intersect two sides of the position mark with a straight line, and detecting mark signals MSa and MSb corresponding to the intersections a and b with the two sides; The displacement amounts △x, △y of the beam preliminary scanning start point C with respect to the intersection B of the position marks are determined based on the detection timing of the mark signals MSa, MSb, and these are used as correction amounts to adjust the X, Y of the character image area scanning beam. A character signal generating device characterized by comprising a deflection signal generating section that transmits a deflection signal to a deflection circuit in addition to a deflection signal.