JPS5817035B2 - Phototypesetting monitor - display imaging method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a phototypesetting machine in which a character image to be projected and printed on a sensitive material is captured by a separate imaging means, and this character image is displayed on a display means to display the printed character image. Regarding the monitor device that enables confirmation, in particular, by uniformly irradiating the image receiving surface of the imaging means with an illuminance proportional to the brightness of the dial illumination light source, the contrast between the character image area and the non-image area can be kept constant. The present invention relates to an imaging method for a monitor device that is capable of displaying high-quality character images without bleeding or borders.

Conventional imaging means include, for example, an industrial television camera (I
TV) etc. are commercially available at relatively low prices, but due to the following problems specific to phototypesetting machines, it is difficult to use this commercially available device as is.
It was difficult to apply it to the monitor device.

In other words, ■ It has only enough response characteristics to be able to fine-tune the contrast of light and dark in ordinary subjects such as landscapes and people, so it can produce extremely high-contrast images such as character images handled by phototypesetting machines (no light reaches non-printing areas at all). (Theoretically, it would have infinite contrast) Because of its characteristics, it cannot fully follow the image, and when displayed, it causes blurring and fringing of the image called blooming, black border, and white halo, and the desired character image This results in an ugly display that is not faithful to the original image.

■ The sensitivity of the photosensitive materials used in phototypesetting machines varies depending on the type, and the light source brightness must be changed significantly depending on the sensitivity. Depending on the change in brightness of the image area, character images with different contrasts with the non-image area will be reproduced during display.

The present invention has been made in view of the above points, and is capable of reproducing character images with a constant contrast dot 5 and without bleeding or borders using a relatively inexpensive imaging/displaying means. This will be explained based on the drawings.

Note that the projection optical system of the phototypesetting machine embodying the present invention is not limited to a specific configuration and may be any optical system; however, one configuration example for realizing the present invention shown in FIG. A typical case is shown.

In FIG. 1, a desired character image on a dial 2 illuminated by a light source 1 is projected onto a photosensitive material on a photosensitive material drum 7 via a main lens 3, a mirror 4, a shutter 5, a moving optical system 6, etc. be done.

Further, a character image equivalent to the printed character image is projected onto the image receiving surface 11 of the imaging means 10 via the optical path branching half mirror 8 and lens 9 inserted into the projection optical system, and the character image is reproduced on the display means 12 by means of the controller 1's knowledge 4
Further, 13 is a brightness detector provided to detect the brightness of the light source 1, 14 is a second light source that uniformly illuminates the entire image receiving surface 11, and 15 is a brightness detector that receives an image with an illuminance proportional to the brightness of the light source 1. This is a light amount adjustment circuit that drives the second light source 14 in response to a signal from the brightness detector 13 in order to illuminate the surface 11.

The present invention is configured to uniformly illuminate the image receiving surface of the image pickup means with an illuminance proportional to the brightness of the printing light source as shown in the example of FIG. The structure is not limited to the one shown in the figure, and can take various forms, such as the configurations shown in FIGS. 2 and 3, for example.

In FIGS. 2 and 3, parts numbered 1 to 12 are the same parts as the same numbers in FIG.

FIG. 2 shows a light guide 16 in which a part of the luminous flux from the light source 1 is guided onto the image receiving surface 11, and FIG. However, in any of these cases, it is possible to irradiate the image receiving surface 11 with an illuminance proportional to the brightness of the light source 1.

Although the three rows in which the image receiving surface 11 is irradiated with illuminance proportional to the brightness of the light source 1 have been explained using FIGS. 1, 2, and 3, in each case the light from the dial illumination light source is Directing the image toward the image receiving surface of the imaging means will be collectively referred to below.

Next, the operation of the present invention will be explained based on FIG.

FIG. 4 shows a logarithmic representation of an example of the illuminance distribution when a character image is projected onto the image receiving surface 11 under various conditions, and for the sake of simplicity, only one character image line portion 19 is shown. It is.

Figure 4 A shows the case where the present invention is not implemented; FIG. It shows the case where

In the case of the conventional example shown in Figure 4 A, the mouth, as mentioned above, the contrast between the non-printing area and the printing area is extremely large, resulting in blurring and edges of the character image. Furthermore, based on the difference in the absolute value of the illuminance of the image area, the contrast of the displayed character image itself will differ depending on whether it is a or a mouth.

Figures 4 and 2 show that when the illuminance of the image area is varied by changing the light source brightness as in the case of the mouth, the image receiving surface is illuminated with an illuminance proportional to the changing light source brightness. , by the brightness equivalent to, for example, over 10 of the illuminance of the image area, that is, in the case of C, the illuminance is 5. In the case of Olux, 2, the entire image receiving surface including the non-image area is brightened by 5 lux relative to the mouth.

When the present invention is implemented in this manner, the contrast (ratio of illuminance) between the non-print area and the print area is not as large as it is on the left, for example, 1:11 in both Figures 4C and 2; In addition, the values are the same, and the contrast is within the operating characteristic range of an inexpensive device, which not only eliminates the problems such as bleeding and bordering, but also enables character images with the same contrast to be reproduced and displayed at all times. become.

As described in detail above, the present invention includes a projection optical system that illuminates character symbols housed on a dial with a dial illumination light source and projects the character image onto a sensitive material, and an imaging optical system that is branched in the middle. In an image capturing method for a monitor display device for a phototypesetting machine, the image capturing means is installed on the image forming surface of the image forming surface, the character image is projected onto the image receiving surface, and the projected character image is displayed on the display means. , the light from the dial irradiation light source is directed toward the image receiving surface of the image pickup means, so that the image receiving surface is uniformly irradiated with an illuminance proportional to the brightness of the dial irradiation light source. As a result, even when the brightness of a light source for irradiating a dial is greatly changed, a desired character image can always be displayed with a constant contrast without causing bleeding or fringing.

In the above description, a case has been described in which an imaging optical system consisting of a half mirror 8 or a lens 9 is provided between the prism 4 and the shutter 5. is not particularly limited, and may be provided as appropriate, for example, as shown in FIG. 5, between the dial 2 and the main lens 3, or as shown in FIG. 6, provided independently from the projection printing optical system. Of course, it can be installed anywhere.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an example of a configuration that realizes the present invention, FIGS. 2, 3, 5, and 6 are diagrams showing other different configuration examples that realize the present invention, and FIG. FIG. 2 is a diagram showing an example of the illuminance distribution on the image receiving surface 11 when the present invention is implemented. 1...Light source, 2...Dial, 3...
...Main lens, 7...Sensitive material drum, 8...
... Half mirror 110 ... Imaging means, 11
... Image receiving surface, 12 ... Display means, 13
...Brightness detector, 14.17 ... Light source for illuminating the image receiving surface, 15 ... Light amount adjustment circuit, 16.
...Light guide, 19...Character drawing area.

Claims (1)

[Claims] 1. A projection optical system that irradiates character symbols housed on a dial with a dial irradiation light C source and projects the character image onto a sensitive material,
For a phototypesetting machine, the imaging optical system is formed with a branch in the middle, an imaging means is installed on the imaging surface of the system, the character image is projected onto the image receiving surface, and the projected character image is displayed on the display means. In the imaging method for a monitor display device, the light from the dial irradiation light source is directed toward the image receiving surface of the imaging means, and the image receiving surface is illuminated with an illuminance proportional to the brightness of the dial irradiation light source. An imaging method for a monitor and display device for a phototypesetting machine, characterized in that the irradiation is performed in a uniform manner.