DE1091858B - Anti-reflective wall cladding for optical devices - Google Patents

Description

GERMAN

The invention is based on an anti-reflection Wall cladding for optical devices with strung together, arranged like scales Slats with their protruding edges pointing in the direction of the incident light rays.

It is already known that surfaces in optical devices can be reduced in their reflectivity reduce the fact that it is broken down into sub-areas and these exclude a harmful reflection Angle to the easy folding direction. For example, interior walls of optical devices for the purpose of reflection prevention with lamellas set up like scales provided, between which incident marginal rays are caught.

The aim of the invention is to create a wall covering of this type which is easy to manufacture and can be connected to the corresponding wall of the device without difficulty.

According to the invention this is achieved in that so the slats by slitting a uniform Thin sheet metal link along a series of substantially parallel and straight lines and bends open of the resulting coherent strip are formed from the plane of the sheet. This wall covering can be releasably connected to the associated wall and in grate-like arrangements be fixed at a distance from the associated wall.

A preferred embodiment of the subject matter of the invention is shown in the drawings, and although in

Fig. 1 in side view and in

Fig. 2 in front view.

In Fig. 1, for example, the lens chamber 10 of a photographic camera is shown. The objective can be seen at 11 at the narrower end of the chamber, and the focal plane is indicated at 12. The normal limit of the light rays falling on the image material in the focal plane is 14. Es However, it can very easily happen that a bright object falls out of the normal plane of the lens, but is still reproduced at acceptable angles at 15 or 16. It follows as a result at 17 and 18 a bright image of the object on the walls of the chamber.

Since lens coatings are not 100% effective, there is a reflection or diffusion into the focal plane, resulting in obscuration or loss of contrast.

According to the invention, an anti-reflection device is inserted into the camera housing and is used to ensure that the light incident on one of the surfaces of the device enters one of the openings in a wall covering that reduces reflections
for optical devices

Applicant:
Micro-Precision Products Limited, London

Representative: Dipl.-Ing. H. Bahr and Dipl.-Phys. E. Betzier, Patent attorneys, Herne, Freiligrathstr. 19th

Claimed priority:
Great Britain dated February 22, 1956

Edwin George Steele, Küigston-on-Thames, Surrey

(Great Britain),
has been named as the inventor

is deflected and reflection phenomena are essentially completely eliminated.

In the illustrated embodiment according to the invention, the negative produced is square, and the inner surface of the camera housing 10 roughly corresponds to a truncated pyramid with a square base.

The anti-reflection device according to the invention consists in this case of a four-sided, likewise Truncated pyramidal hollow body, which consists of four similar parts 21, 22, 23, 24 made of thin sheet metal is composed, the edges of which are formed by flanges 21a to 24a by welding or soldering are connected to each other. Each of the parts 21 to 24 has a series of parallel narrow slots 25 which extend to the edges and have extensions 25 a at the ends. Those educated in this way long lobes are bent out of the sheet metal plane, as can be seen in the lower part of Fig. 1, creating a series of narrow, parallel, spaced apart, non-reflective surfaces, which are inclined to the plane of the sheet. Each lobe is inclined that which is near the lens lying longitudinal edge is bent inwards or the other edge is bent outwards. That way will the light coming from the lens and falling on the inner surface of the device between the lobes distracted and not reflected on the film. It is true that there is little reflection from the outermost longitudinal edges 26 of the lobes present, which, however, can be neglected since the lobes, in particular, are attached this point, made of very thin metal.

009 629/171

The flanges by which the parts of the device are connected to one another can be used to insert the device into the camera housing. In addition, it can be fixed by flanges 21 b or 23 b at the other, open end.

Of course, the invention is not limited to those described in detail above and in the Embodiments shown in the figures are limited, but there are numerous modifications possible without deviating from its basic idea.

Claims (5)

PATENT CLAIMS: 1. Anti-reflective wall cladding χ for optical devices with lamellas arranged in a row and arranged like scales, which with their protruding edges point in the direction of the incident light rays, characterized in that that the slats by slitting a unitary member of thin sheet metal along a Series of essentially parallel and straight lines and bending of the resulting cohesive strips are formed from the plane of the sheet. 2. Wall cladding according to claim 1, characterized in that the slats by cutting edge Edges are limited. 3. Wall covering according to claim 1 or 2, characterized in that it is detachable with the associated wall is connected. 4. Wall covering according to one of the preceding claims, characterized in that it is attached in a rust-like arrangement at a distance from the associated wall. 5. Wall covering according to claim 4 for a photographic camera, characterized in that that they are preferably used as an insert between the lens and the image material located in the focal plane is arranged in the form of a truncated pyramid. Considered publications:
German Patent No. 910 142;
U.S. Patent Nos. 2,242,317, 1479 112, 291,405. 1 sheet of drawings © 009 629/171 10.