Recorders – Printing – dotting – or punching marker – Ink transfer support or moving means
Patent
1986-07-10
1988-01-05
Evans, Arthur G.
Recorders
Printing, dotting, or punching marker
Ink transfer support or moving means
350 67, G01D 1510
Patent
active
047179287
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an arrangement for producing a pattern on a light-sensitive surface by means of a beam of light capable of being moved over the surface.
BACKGROUND
Arrangements of the kind indicated above are usually in the form of so-called photo-plotters, which have involved considerable investments until now. Photo-plotters are so arranged as a general rule as to be capable of being connected to CAD systems, of which various designs have been introduced onto the market at relatively low prices.
Technical Problem
One problem which is encounterd in this context, however, is the ability to achieve a sufficiently low cost for the photo-plotter in relation to the price of the more simple CAD equipment, but without jeopardizing its viability.
The solution
The problem faced by the invention is solved by the arrangement, in which the spot of light is generated by means of a beam of light emitted from a lighting unit, which is directed at the light-sensitive surface and is caused to strike the surface intermittently in the form of flashes of light as the beam of light is moved over the surface in accordance with specific instructions from a control unit, for which purpose the pattern is made up of lines running not only in a selected reference direction, but also at right-angles to the selected reference direction, and also at at least one further fixed angle to the reference direction, in conjunction with which the lighting unit contains an aperture by means of which certain dimensions of the pattern, such as the width of the aforementioned line, are set, and characterized in that the aperture is so arranged as to produce the aforementioned spot of light on the light-sensitive surface in the form of an isogonal polygon having at least six sides and with a first pair of sides which lie opposite one another and are essentially parallel to one another, and a second pair of sides which lie opposite one another, are essentially parallel to one another and are essentially perpendicular to the first-mentioned pair, and at least a third pair of sides which lie opposite one another, are parallel to one another and lie at an angle to the first-mentioned pair of sides at the aforementioned fixed angle, in conjunction with which the beam of light is so arranged as to move for each flash of light over a distance which is not more than the length of those sides which extend in the direction of movement.
Advantages
The present invention provides an arrangement which satisfies the stringent requirements in respect of reliability and precision and which, at the same time, can be made available at a price which is in line with the prices of the more simple CAD systems.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention is described below in greater detail as an illustrative embodiment with reference to the accompanying drawings, of which
FIG. 1 shows a plan view of an arrangement according to the invention, referred to below as a photo-plotter;
FIG. 2 is a section through the arrangement along the line II--II in FIG. 1;
FIG. 3 shows a block diagram of an example of the principal functions of the photo-plotter;
FIG. 4 illustrates the principle embodied in the invention for producing a pattern on a light-sensitive surface;
FIG. 5 illustrates the manner in which certain areas are constructed by the plotter;
FIGS. 6 and 7 show two embodiments of apertures contained in an optical system which are used for producing the pattern on the light-sensitive surface, and
FIG. 8 shows an example of a type of pattern, in this case a printed circuit board for an electronics application.
BEST MODE OF CARRYING OUT THE INVENTION
The arrangement according to the invention, i.e. the photo-plotter, is essentially constructed on a rigid frame 1 made of a metal such as cast iron, for example, in order to provide good dimensional stability and the ability to remain unaffected by fluctuations in temperature. The frame 1 supports a table 2 with a flat surface for the material which is to be provided with a p
REFERENCES:
patent: 3771350 (1973-11-01), Romans
patent: 4578331 (1986-03-01), Ikeda et al.
patent: 4612555 (1986-09-01), Hongon et al.
Cano Jean
Lans Hakan
Evans Arthur G.
Inrad S.A
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