DE2756208A1 - Photocomposing machine with continuously variable focal length - uses standard camera zoom lens and afocal and collector components - Google Patents

Abstract

The optical image is achieved using a compact objective with continuously variable focal length. The zoom objective comprises a universally applicable main section (21) and additional parts (23, 24) for special use in the composing machine. The main section is an afocal central part with zoom unit and optical collectors (23, 24) at each end. Adjustment of the image size of the zoom unit simultaneously controls the intensity of the light source. The thickness and spacing are regulated by a rotatable mirror moved by a lever arm whose length equals approx. the distance between mirror and film.

Description

Photocomposing machine

The invention relates to a photocomposing machine that is easy to use and compact structure allows easy change of all set parameters on a large scale, e.g. for the set of forms and tables.

The process of light typesetting made it possible to type texts, Tables1, forms and the like to be automated to a large extent, since the sentence is represented by illustration of predetermined standard characters of a fixed size on a light-sensitive Area is produced with optical enlargement or reduction of the characters. Such light typesetting machines should also be suitable for small typesetting businesses; then they have to be small (table-top machines), simple and robust, light maintenance and adjustment must be operated by non-specialized personnel can and still allow a wide variation of all sentence parameters, e.g.

for the production of tables and forms.

There are smaller photocomposing machines known, each one part meet these requirements. With simple and easy-to-use machines but the necessary variation is not possible or is only possible to a limited extent; for photocomposing machines With the necessary range of variation, on the other hand, the construction is complex and therefore expensive to manufacture and maintain. Among the well-known photocomposing machines are those in which the font size is achieved through the use of different projection lenses is varied (e.g. DOS 22 62 439, DOS 22 62 485). On the other hand, they are photocomposing machines known for which the font size, i.e. the image scale continually veriabel is', e.ltlder in that with a lens of fixed focal length the image distance and the subject width can be changed in a fixed relationship to one another (principle of the enlarger, DCS 2443 693), or by holding the width of the image object the focal length of the imaging optical system is changed (DOS 25 59 573).

The disadvantage of the first method is that there are few lenses only a correspondingly few font sizes are available that with a larger number of lenses, the system is correspondingly complicated and the adjustment effort high will; on the other hand, changing a lens is easy. The disadvantage of the second The procedure is its complication: When changing the image and object distance must have at least two of the assemblies: character carrier, lens, light-sensitive Material and one or more reversing systems are guided precisely over longer distances, in exact relation to each other in a variable focal length optical system similar tasks are to be solved, with corresponding effort for adjustment and difficulty when repairing. - In the known smaller photocomposing machines, for the Setting along the line (thicknesses and spaces) of either the one to be exposed Film or the sign carrier or part of the optical system on a carriage postponed (DOS 2559 573, DOS 2543 910, DAS 1597 780); in the latter case often a piece of the beam path is collimated in parallel, so that part of the optical System can be moved along its axis without affecting the optical Change the properties of the overall system. In other known photocomposing machines the image of the character to be displayed is created by a rotatable mirror in the beam path moved down the line. The first method has the problem that because of the large masses that have to be accelerated and braked, either laborious Construction or slow work is necessary. With a rotating mirror that is Problem the exact guidance, because because of the length of the imaging light beam between Mirror and light-sensitive surface will be any inaccuracy of mirror guidance clearly visible in the print template. - With the known photocomposing machines the typesetting parameters (thicknesses, spaces, line feed, weft) in the Measure the fixed character template (matrix, font) entered and processed; for the artwork these dimensions must be converted using the enlargement or reduction ratio which sometimes happens in the machine, but with a corresponding effort conditional.

The invention is based on the object of the construction of phototypesetting machines to simplify so that manufacture as well as adjustment and maintenance even with suitability for difficult typesetting tasks require so little effort that the machine can also work for small farms can be used.

The object is achieved by combining components known per se to a new technical system. In particular, in the arrangement according to the invention a compact zoom lens (rubber lens) is used to change the font size. In a preferred form, a zoom lens manufactured in large series for cameras is used that only needs to be changed a little for the specific purpose. Particularly It is advantageous to use a zoom lens that consists of an afocal middle part with the actual Zoom effect ("variator) exists - an optical system that works with parallel beams works on both sides - and from two optical collection systems on the ends of the variator, which are independent of each other and from the variator in the direction of the optical Axis are movable for the purpose of focusing. - The character position within a line is done by a rotating mirror in a manner known per se.

The required accuracy is achieved in that the rotating mirror is moved via a lever arm, which on the one hand is so long that the inaccuracy is not significantly enlarged at its end on the artwork, on the other hand the moment of inertia of the mirror with the lever arm is so small that fast Movements are possible. In a preferred embodiment, the lever arm is as Toothed segment formed, which moves via a worm by a stepping motor will.

The sheet material to be exposed is advantageous, as is known per se, mounted in a cassette that feeds the line in the appropriate direction is moved. This arrangement, together with the described spacing by a rotating mirror, results in a particular simplification for the computer program and for the operation: all sentence parameters (thicknesses, spaces, line feed, weft) are entered, processed and in the dimensions of the desired finished artwork output (converted directly into movement of the rotating mirror and the cassette); only the thickness values of the font currently in use were for the standard font size taken from an exchangeable memory ("thick plug") and accordingly multiplied by the imaging ratio set on the zoom lens. -In a preferred Embodiment of the light setting machine according to the invention is the intensity of the Flash lamp without the computer, e.g. via a potentiometer, by setting the Objectively controlled.

The advantages achieved with the invention are in particular: that the individual assemblies of the photocomposing machine are manufactured and adjusted separately can be; that especially the sensitive optical system as a compact zoom lens can be manufactured, exchanged or adjusted; that uses a zoom lens which can also be used for other purposes, advantageously in large series manufactured, and is therefore relatively insensitive and inexpensive; and that, because of the division of the lens into an afocal middle part and two converging end parts, the adjustment is considerably simplified. Another advantage is that the spacing takes place precisely and at the same time quickly without great constructive effort, and that both the computer program and the operation are simple, since both are on stores the dimensions of the finished artwork.

An embodiment of the invention is explained with reference to the drawings. Fig. 1 shows the overall system: On an evenly rotating A character carrier (font) (2) is stretched on drum (i). Inside the drum there is a flash lamp (3), which in a known manner by optical markings the passing characters, read by a photo cell (10), is triggered. The zoom lens (4) is located in the beam path, its focal length with the servomotor (5) can be adjusted. The mirror (7) which can be adjusted with a stepping motor (6) finally ensures in a known manner for the production of a print line on a cylindrical photosensitive surface (8). A computer (9) controls the mirror position for thickness values, the point in time and the energy of the light flash and the movement of the film cassette (8) (for line feed and interleaving) according to the following input data: The photocell (10) reports the type and position of the character in the beam path, the servomotor (5) adjusts the image scale set on the zoom lens (4), the Thickness plug (11) the thicknesses of the font in the standard size, and finally the operator selects the desired typesetting process via the keyboard (12).

Fig. 2 shows schematically an embodiment of the zoom lens consisting from the afocal middle part (21), the imaging ratio of which can be set on the ring (22) is, and two collecting end systems (23,24), which are displaceable with respect to the central part are arranged. By simply moving the end part (23), for example, the image width change without changing anything in other optical properties of the system will.

Fig. 3 shows schematically the arrangement of the rotating mirror (7) with Help of the tooth segment (32) is rotated about the axis (33). A stepper motor drives (34), which is controlled by the computer (9), a worm (35), which with the tooth segment is engaged. The radius of the tooth segment (32) is approximately equal to the radius of the Cylindrical surface (8) of the layout film.

L e r s e i t e

Claims (9)

PATENT CLAIMS 1. Non-setting machine for the production of artwork by mapping characters on a character carrier using an obtic system variable reproduction scale, on a support with a light-sensitive layer, characterized in that the optical imaging through a compact lens takes place with continuously variable focal length. 2.) light setting machine according to claim 1, characterized in that the Zoow lens consisting of a universally usable main part (21) and additional parts (23,24) exists for the special task in the photocomposition machine. 3.) light setting machine according to claim 2, characterized in that the main part (21) of the zoom lens (4) is an afocal middle part with a zoom device (Variator) is, and the additional parts (23,24) optical collection systems at the ends are. 4.) Light setting machine according to one of claims 1-3, characterized in that that the setting of the image scale of the zoom device (4) at the same time Controls the intensity of the light source (3). 5.) Light setting machine according to one of claims 1-4, characterized in that that the thicknesses and spaces are adjusted by a three-way mirror (7) is moved via a lever arm (32), the length of which is the order of magnitude of the distance from the mirror (7) to the film (8). t.) Light setting machine according to claim 5, characterized in that the long lever on the rotating mirror (7) is a toothed segment (32). 7.) light setting machine according to claim 6, characterized in that the toothed segment (32) is moved via a worm (35). 8.) Light setting machine according to one of claims 5-7, characterized in that that the game gel is moved by a stepping motor. 9.) Light setting machine according to one of the preceding claims, characterized in that that input, processing and output of all lengths (such as thicknesses, spaces, line feed and weft) take place directly in the dimensions of the finished artwork.