EP0424692A1 - Procedure for inscribing or marking slides - Google Patents

Abstract

Inscribing of slides after the development thereof is possible by removing at least one of the colour layers on the film support or glass support by means of laser engraving. <IMAGE>

Description

The invention relates to a method for labeling or marking slides.

In professional laboratories it is customary, for reasons of exact documentation, to provide slides with labels or markings, the information about the picture content, time of origin or the like. include. Before developing the slide, the corresponding information can be faded into an image taken, for example, by means of a camera. The photosensitive film is additionally exposed with the labeling or marking information. After development, the label then appears on the slide.

This labeling or marking of the slide can be located either in the image area or on the edge outside the image area.

Labeling slides, however, proves to be quite complex in terms of device technology. Furthermore, a considerable difficulty with this type of labeling is that it is often not yet clear at the time the image is captured whether labeling should be carried out at all and, if so, what type of labeling is used. So you have to be at the time of taking the picture, at the latest by the time the image development to be clear about what kind of lettering should be.

The object of the invention is to provide a method for labeling or marking slides, which makes it possible to select the type of labeling at a later time.

This object is achieved according to the invention in a method for labeling or marking slides, in which, after development, the labeling or marking is introduced into at least one, preferably all, of the color layers by means of laser engraving.

It is known per se that a laser beam can also be used for engraving. So it is e.g. In the field of printing technology, it has been common practice for some time now to introduce image templates in the form of a relief into the surface of a roller or other support by means of laser engraving. However, the use of laser engraving according to the invention in slides is a special feature insofar as laser engraving on the one hand and photographic image development on the other hand represent two different image generation methods, which are combined here to create a single image carrier.

In the case of black and white transparencies, it is naturally sufficient to attach a later clearly visible lettering if a layer of color is removed from the laser beam in places. In the case of color transparencies, all of the color layers are preferably removed in places from the glass or color support. By suitable adjustment of the laser beam intensity and / or the loading radiation duration of the slide can be achieved that only one or only two layers of color are removed. In this way, monochrome lettering can be achieved, which is clearly visible on the one hand, but on the other hand, if the lettering is in the image area, does not appear to be a nuisance.

The laser beam removes the at least one layer of paint on the glass or film carrier in a locally limited manner by evaporation.

Finally, the invention also relates to a slide with a lettering or marking introduced by laser engraving after development.

• Fig. 1 eine perspektivische schematische Skizze einer Anlage zum Beschriften von Diapositiven mittels Laser­gravur, und
• Fig. 2 eine schematische Querschnittansicht eines Farb-Diapositives, welches durch Lasergravur beschriftet wird.

An exemplary embodiment of the invention is explained in more detail below with reference to the drawing. Show it:

• Fig. 1 is a perspective schematic sketch of a system for labeling slides using laser engraving, and
• Fig. 2 is a schematic cross-sectional view of a color slide, which is labeled by laser engraving.

In Fig. 1, a slide 1 is shown on the left side, which consists of a film 2 and a picture frame 3.

The slide 1 is moved in the direction of the arrow by a transport device 4 past a laser device 5, the laser head 6 of which directs a controlled laser beam L into the lower left corner of the film 2.

With the laser beam L, a label 7 is attached in the lower left corner of the slide film, which in the example shown consists of a sequence of numbers 1, 2, 3 ..., the laser beam L in the illustrated state being engraved with the number "3 "is.

The laser beam L is deflected horizontally and vertically by the laser head 6 in a manner known per se, so that the point of incidence of the laser beam L is characterized by a greatly increased temperature of the material of the film 2. The dwell time of the laser beam at a certain point and / or the beam intensity of the laser beam L are set so that a certain depth of the film material is evaporated.

This is shown in more detail in Fig. 2. The film 2 here consists of a transparent film carrier 21 on which there are three layers of color 22, 23 and 24. Any intermediate layers are not shown in the drawing.

As shown on the right in FIG. 2, the laser beam L strikes a specific point on the film 2. Due to the temperature increase, part of the material of all the color layers 22, 23 and 24 evaporates, so that a hole 8 is formed. A desired lettering can be created by horizontally and vertically deflecting the laser beam engrave on the footage.

With a shorter dwell time of the laser beam L at a certain point and / or with a lower beam intensity, a limited hole depth can be achieved. You can e.g. Control the dwell time and / or jet intensity in such a way that only the upper color layer 24 or only the two upper color layers 23 and 24 are removed.

In a departure from the exemplary embodiment shown above, the labeling or marking of the slide can also be carried out at a location outside the image area shown in FIG. 1, e.g. on the left or right edge of the image.

Claims (3)

1. A method for labeling or marking slides, in which, after development, the labeling (7) or marking is introduced into at least one, preferably all, of the color layers by means of laser engraving. 2. The method according to claim 1,
characterized in that the beam intensity of the laser beam and / or the irradiation time for the engraving are set such that a predetermined number of layers of color (22, 23, 24) on the transparent glass or film carrier (21) are optionally removed. 3. Slide with a label (7) or marking introduced by laser engraving after development.

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