JPS5823638Y2 - phototypesetting machine - Google Patents

Description

[Detailed explanation of the invention] This invention is a phototypesetting machine (
(hereinafter referred to as a phototypesetting machine).

For conventional phototypesetting machines, there was no easy and reliable method for detecting character width and character height, so a special typesetting machine that precoded and stored character width and character height data for each character on the dial was used. It was necessary to prepare a memory and a code board that could be attached to the character frame.

Therefore, a dedicated memory and code board for each dial face and a special reading device are required, which not only makes the phototypesetting machine complicated and expensive, but also requires switching and replacing the dedicated memory and code board when changing the dial face. Complicated and troublesome work remained.

As such a conventional phototypesetting machine, Japanese Patent Application Laid-Open No. 50-5522
There is Publication No. 3.

In this technology, a character image for one character is detected by a group of photodetecting elements arranged in a mesh pattern, and the character width and height are determined from digital electrical signals.

However, this method requires arranging a large number of detection element groups in the vertical and horizontal directions, which makes the detection processing circuit extremely complex and expensive.

The present invention was made to eliminate the above-mentioned drawbacks. An imaging lens and a cylindrical lens are installed at appropriate positions in a projection optical system, and behind the imaging lens and cylindrical lens, For example, a linear one-line sensor element consisting of multiple optical sensing devices (e.g., solar cells or photodiodes) is arranged to receive the image projected from the cylindrical lens, and detect the width and height of the character image. The present invention provides a character width and character height detection device that detects character width and character height.

To summarize the present invention, in a phototypesetting machine that photographs and prints a character image housed on a dial onto a photosensitive material using a photographing optical system, a detection optical system is formed by branching a character luminous flux from the photographing optical system. , an imaging lens and a cylindrical lens installed in this detection optical system, and a line sensor element installed behind this imaging lens and cylindrical lens, and the imaging lens and cylindrical lens The character light flux is changed so that the character image extends only in a predetermined direction and is projected onto the line sensor element, and the line sensor elements are arranged linearly in a direction perpendicular to the predetermined direction. This makes it possible to detect the character width and height of the image.

Hereinafter, the present invention will be explained with reference to the illustrated embodiments.

FIG. 1 is a simplified illustration of the principle of a phototypesetting machine.

1 is a dial that can be moved freely in the X-Y directions; 2 is a light source that illuminates the dial 1 through a mirror 3, and transmits the transmitted character luminous flux to a main lens 5, a deformable lens 6, prisms 8 and 9, and a travel lens 7. Then, it is guided onto the photosensitive material 12 housed in the magazine 11 via a travel system 14 consisting of a travel prism 21, etc., to form a character image.

In this way, a photographing optical system from the light source 2 to the magazine 11 is formed.

Note that when the light source 2 is a continuous light source, a shutter 13 is required, but when it is a flash lamp, this shutter is not necessary.

15 is a drive source that moves the travel system 14 in the direction of the arrow;
The same <16 is a drive source that rotates the drum around which the photosensitive material is wound.

17 is a display board, and 18 is a finder that indicates the imaging plane.

This finder uses the letters on the dial 1 mentioned above to read the photosensitive material 1.
An image from a removable mirror 4 installed in the middle of the optical system for photographing the image on the image forming surface 1 through a lens 22.
7, and is used to check the character image to be photographed.

A half mirror installed in the middle of this finder optical system
Ml is for guiding light to a branching optical system a to be described later.

In addition, each of the above-mentioned components is an example and does not limit the scope of the present invention.

FIG. 2 shows an embodiment of the branching optical system a described above, which is composed of a lens 22, a cylindrical lens 23, and a sensor element 24.

The light directed toward the imaging lens 22 is the character light flux from the mirror 4 in FIG. 1, and the light directed toward the cylindrical lens 23 is the light flux that has passed through the half mirror M1 and the mirror M2 in FIG.

Of course, the half mirror Ml may be a normal mirror as long as it is detachable from the finder optical system, or the branching optical system a may be made independent of the finder optical system and coupled to the photographing optical system.

On the other hand, a branching optical system is installed behind the travel system 14 and is configured to guide the character light flux from the travel lens 7 and the travel prism 21 to the cylindrical lens 23 and the sensor element 24.

Therefore, in this case, the travel lens 7 must correspond to the lens 22 in FIG. 2, and the travel prism 21 must be a half prism.

The sensor element 24 will be described in detail later.

FIG. 3 shows the spread of the image when the character light beam is projected onto the sensor element 24 by the two lenses 22 and 23.

FIG. 3A shows a case where a convex dinontrical lens 23a is used, and the character light flux is concentrated at the composite focus of the imaging lens 22 and the cylindrical lens 23a, and then enters the sensor element 24 in a diverging state.

To explain the state of this character luminous flux in more detail, Fig. 4A
2 shows the image forming state on the sensor element when only the lens 22 is arranged, and FIG.

In Figure 4A, 19 is the area of the letter U (virtual body)
, and W is the width of the letter U.

In other words, the width of the letter U when converted to an arbitrary magnification by the main lens 5 in FIG. 1 and projected onto the sensor element 24 is W.
This shows the situation.

For this letter U, the sensor element 24 is sufficiently longer than the area 19 in the width direction and shorter than the area 19 in the height direction.

In this way, the sensor element 24 has one line or n
It consists of a line sensor.

Therefore, this line sensor element 24 must be sufficiently smaller than the area 19 in either the width or height direction.

Of course, depending on the magnification of the main lens 5 and the deformable lens 6, it is assumed that the image projected onto the sensor element 24 may be smaller, but as a general rule, the above conditions are given to the sensor element 24. .

When a character U is projected onto such a sensor element 24, the width of the character U that can be detected by the element 24 is only W'(W>W') projected onto the sensor element.

Therefore, unless a relative movement is made between the sensor element and the character image, the true character width W in the detection state shown in FIG.
cannot be detected.

FIG. 4B shows a solution to this problem, in which a cylindrical lens 23 is installed and the sensor element 24 is
The image formed on the screen is enlarged so that the character width W can be reliably detected.

In other words, while both the cylindrical lens and the sensor element remain stationary, the desired character width (or character height) can be detected using a sensor element that has a smaller value in the height or width direction than the area 19 for one character. It is configured as follows.

In the case of FIG. 3B, a concave cylindrical lens 23b is used, and the sensor element 24 is placed in front of the composite focus of the two lens systems 22, 23b.
It is installed to receive the diverging light of b.

In this case as well, the same results as described above can be obtained.

In any case, a lens 22 or 23 is used to diverge the character luminous flux so that the character width or character height can be detected by the sensor element 24, and any point on the character image is enlarged in a predetermined direction by at least the amount of the virtual body of the character image. It is sufficient if the arrangement is as follows.

The present invention is based on the above-mentioned principle, and a sensor element is arranged at the rear position of the imaging lens and the cylindrical lens, and furthermore, as shown in the example of FIG. By arranging the sensor element at approximately the center position, the entire image can be enlarged and viewed, and the true character width can be detected while the sensor element remains in a fixed position.

In addition, to detect the character height, a sensor element and a cylindrical lens are integrated and rotated by 90 degrees by a rotation mechanism (not shown), or a separately known image rotation prism is inserted into the optical path. The detection can be easily performed by a method such as rotating the character light beam by 90 degrees and forming an image on the sensor element.

Further, according to the present invention, even if a character image has been subjected to any deformation by the deforming lens 6, the character width and character height can be accurately detected.

The character width and character height detection device of the present invention has been described above, but in the case of the present invention, the size of the character incident on the sensor element and the size of the character projected onto the photosensitive material do not necessarily match.

Therefore, it is necessary to convert the character width detected by the sensor element into the actual character width, but this can be carried out in various ways based on a conversion formula that can be appropriately determined depending on the optical conditions, and is beyond the scope of the present invention. It is not limited.

As described above, according to the phototypesetting machine of the present invention, a detection optical system for detecting the character width and character height of character images is newly installed from the photographing optical system for phototypesetting, and the image is formed on this optical system. By arranging lenses and cylindrical lenses, the character light beam is extended only in a predetermined direction, and the character light beam is collated from a direction perpendicular to the above-mentioned direction of expansion by line sensor elements arranged in a straight line. 1 as before
It is no longer necessary to arrange photodetecting elements in a plane to detect the character luminous flux for a character, and the complexity of encoding character width and character height information of character images is completely eliminated.

In particular, by installing an imaging lens and a cylindrical lens, the light detection element can be simply a linear line sensor, and the associated processing circuitry is significantly simplified, and moreover, accurate detection of character width and character height becomes possible.

[Brief explanation of drawings]

Fig. 1 is a simplified schematic diagram showing the principle of a phototypesetting machine according to an embodiment of the present invention, and Fig. 2 shows the constituent countries of the optical system of the character width detection device used in the phototypesetting machine of the same embodiment. Figures 3A and 3B are incident light diagrams of the lens system showing the specific principle of detection of character width and character height. FIG. B is an image of projected characters on the sensor element side. 1...Dial, 12...Photosensitive material, 1
8... Finder, 19... Imaging surface,
21... Half mirror 122, 23...
・Lens, 24...Sensor element.

Claims (1)

[Scope of utility model registration request] In a phototypesetting machine that photographs and prints a character image housed on a dial onto a photosensitive material using a photographing optical system, there is provided a detection optical system formed by branching a character luminous flux from the photographing optical system, and this detection optical system. and a line sensor element installed behind the imaging lens and cylindrical lens. The width and height of the character image can be adjusted by changing the character image so that it extends only in a predetermined direction and projecting it onto the line sensor element, and by arranging the character image linearly in a direction perpendicular to the predetermined direction. A phototypesetting machine that makes it detectable.