DE1898275U - CROSS-MOVING EXPOSURE HEAD. - Google Patents

Description

DR. ING. H. THANK YOU

PATENT ADVOCATE HAMBURG 86 ■ NETTER WALL 41 * · FERNRUF 36 74 38 AND 3β 41 15

TELE QRlMM-ANS OHBIfX 1 STBQBiI) AF

PA 271757 * 16. k.ik

Photomechanics Limited

Lyon Way, Hatfield Road, April 15th, 1964

St. Allans, Hertfordshire

En gland

Lateral moving exposure head

It is "known to make design drawings by contact printing reproduce in a vacuum frame in which the Original and the sensitive surface are held against a glass plate, namely by evacuating a room between the glass plate and the rubber support plate that goes through a drain opening takes place in the rubber backing plate, wherein the sensitive area is then exposed through the glass plate.

According to the innovation, a sensitive surface is rolled into one The vacuum frame exposed through the image to be reproduced by means of a narrow light source, which extends from the one Side of the sensitive surface extends to the other and is arranged in an exposure head, which during the exposure is moved from one end of the sensitive surface to the other end in the transverse direction, so that the sensitive Area is exposed strip by strip through the light source. This has the gate part that a control of the exposure can only be effected by changing the crossing speed. It also improves the uniformity of the lighting improved, and rapid exposure can be achieved with a light source of reduced power than the usual ones

«· 2 -

Arc lamps at some distance from the positive drawing and the sensitive surface must be set up in order to achieve sufficient uniformity of the lighting.

According to a further feature of the innovation, the glass plate is replaced by a "flexible, transparent Mim, which is peeled off a roller to cover the sensitive surface when it has been put into position · The The rubber seat plate is preferably replaced by a perforated plate, the suction effect through the perforations of the Plate is applied by means of a vacuum pump. With such an arrangement, the drawing can directly refer to metal components irregular surface, where by clamping between a glass plate and the Rubber cover no success could be achieved. Bas imprinting is achieved with such components by first coated with a sensitive layer and then, after exposure, a developer is streaked over it to make the latent · make image visible ·

For a better understanding of the innovation, an example is given Door direction described with reference to the drawings.

In this example they are along the two sides of a print frame 2 arranged two rails 1, and a narrow, transverse exposure head 3, which is a light source has two wheels 4 at each end that run on the rails. The head contains fluorescent tubes 5, which are a light with a high proportion of ultraviolet rays, as well as a second set of lamps 6 that produce a light of longer

Generate wavelength. A flexible, plastic plate 7 is pulled off a roll 8 by a Dräger roll 9. the perforated table surface 10 is arranged above yaku pump nozzles 11. A dashboard 12 is to turn on the light source, the vacuum pump and the drive motor are provided.

An electric motor is used to drive the exposure head carriage on the rails. This motor forms a rope of a Wardleonard system, the easy control of the carriage speed enables.

Another advantage of hiring is that Use of a light source of this type enables the spectral content to be changed to some extent, to adapt to the requirements of the printing area.

Claims (3)

Protection claims 1 device for printing drawings with a radiation source and a vacuum frame including a transparent covering material under which a sensitive area and an image for exposing the sensitive area through the image and the transparent covering material are arranged, characterized in that the radiation source (5, 6) is arranged in an elongated exposure head (3) which extends from one side of the frame (2) to the other, and drive means are provided for the exposure head to drive it across the transparent cover (7) from one end of the frame to the to move others so that the sensitive surface is exposed strip by strip to the radiation source 2. Apparatus according to claim 1, characterized in that the transparent cover (7) is in the form of a flexible film which is unrolled after the sensitive surface and the image have been brought into position. 3. Apparatus according to claim 2, characterized in that a vacuum pump through a perforated support plate (10) _ ο which exerts suction on the space between the support plate and the "flexible, transparent PiIm (7)