DE1058843B - Continuous exposure unit for photographic support - Google Patents

Description

GERMAN

Continuous _{exposure devices j} in which a tubular light source is arranged at a relatively small distance from the exposure surface are known. In general, fluorescent tubes are used for such purposes, the light intensity of which is not easily adjustable. In order to change the exposure intensity and adapt it to the respective conditions, adjustable diaphragms have been used. With a large adjustment range for fine adjustment of the exposure intensity, they require a precise design of the adjustment means.

There are also already known arrangements in which to change the exposure intensity of the Distance of the light source from the exposure surface is made variable. The setting range is naturally low here.

The invention is based on the object, in the simplest constructional manner, as large as possible to enable fine adjustment range for the exposure intensity.

According to the invention, the arrangement is made such that the light source is on a pivotable support and on this between the light source and the pivot bearing an aperture strip running parallel to the light source is fixed, the edge of which restricts the effective light emission angle all the more, the further the light source is pivoted away from the exposure area. In this way At the same time as the change in distance, an adjustment of the aperture is effected in the same way, without the need for an additional mechanism to adjust the aperture.

An embodiment of the invention is shown schematically in the figure and below described in more detail.

The layer carrier 1 to be exposed is together with a template in not shown here Way past a transparent exposure surface 2 continuously. In front of the exposure area 2 is one extending over the width of the exposure area 2 (perpendicular to the plane of the drawing) Fluorescent tube 3 arranged. The fluorescent tube 3 is pivotably mounted on both sides at 4 Support 5 supported. Between the pivot point 4 and the fluorescent tube 3 is on the carrier 5 parallel to the fluorescent tube 3 an aperture strip 6 firmly attached. The pivoting movement of the carrier 5 is effected by a cam 7, on the shaft 8 outside of the housing, not shown a rotary knob 9, which can optionally be adjusted according to a scale, is seated and the one that acts on the carrier 5 Return spring 10 cooperates.

If the carrier 5 is brought into the position designated by I by the cam control 7 to 9, then continuous exposure is made
for photographic supports

Applicant:

Hermann Wolf GmbH,
Wuppertal-Elberfeld, Kieler Str. 31-35

Dipl.-Volksw. Hermann Wolf, Wuppertal-Cronenberg, and Dipl.-Ing. Hermann Wolf jun.,

Wuppertal-Elberfeld,
have been named as (inventors

on the one hand the exposure intensity is increased by approaching the fluorescent tube 3, but at the same time the edge 6 'of the diaphragm 6 also releases an enlarged light emission angle a . In setting II, on the other hand, the fluorescent tube 3 is almost completely covered by the aperture strip 6, and the exposure intensity is reduced as a result of the greater distance between the lamps. The exposure intensity can be varied continuously over a wide range between these two end positions I and II.

Claims (1)

PATENTANS P R Ct CHE: 1. Continuous exposure unit for photographic substrates with a tubular light source, z. B. a fluorescent tube, the distance from the exposure area for the purpose of adjustment the exposure intensity is variable, characterized in that the light source (3) on a pivotable support (5) and on this between the light source and pivot bearing (4) an axially parallel to the light source (3) extending aperture strip (6) is arranged so that its Edge (6 ') the effective light emission 909 529/157