FR2473189A1 - GRATICULE FOR OPTICAL OBSERVATION DEVICES - Google Patents

Abstract

THIS GRATICULE 1 INCLUDES IN THE FOCUSING PLAN OF OPTICAL OBSERVATION DEVICES AND CONTAINING DRAWINGS 3 CONSTITUTING MARKER LINES, FOR EXAMPLE FOR THE IMAGE FIELD OF A VIEWER OF A RECORDING DEVICE, THE FEATURES DRAWN 3 ARE CARRIED OUT BY SCRATCHING OR BY CHEMICAL ATTACK IN GRATICULE 1 AND THE LATTER IS ARTIFICIALLY LIT FROM ITS EDGE BY AT LEAST ONE LAMP 2. APPLICATION IN PARTICULAR TO LUMINOUS FRAME VIEWERS OF CAMERA.

Description

The invention relates to an illuminated graticule, placed

  in the plan for the development of optical observation devices

  and bearing any designs or marks of any kind

  images of the viewfinder image field of a

  reil shooting. For the representation of the image field of the viewfinder of a camera, we use so-called light frame viewers, which illuminate the drawing under the effect of daylight. When, however, in the case of the use of such graticules in optical observation devices, there is no daylight or too little light, as for example in the case of cameras views used for night shooting, devices are known

  artificial illumination of the graticule or

  image field, in which the illumination of the

  This is achieved by the fact that by means of a divider

  radiation is achieved by reflection, with a clear

  the actual optical image of a predetermined artificially illuminated image field mask on the

radiation from the device.

  US Pat. No. 4,101,916 discloses a graticule on which reflective features are deposited by vaporization. These features are illuminated by means of a radiation divider, which is located in the observation device, so that the observer sees the reflective pattern

  enlightened. The object of the invention is to improve a graphical

  the type described above so that the latter

  be illuminated without the aid of a radiation divider.

  The problem is solved in a graticule of the type

  described above by virtue of the fact that the reference marks

  are scratched or chemically attacked on the

  the latter, provided with these drawings, is illuminated

  tificially from its edge using at least one lamp. Thanks to the presence of the recessed lines and the peripheral illumination, the lines become

  luminescent because of their reflective characteristic

  health. The illumination of the graticule is approximate

  perpendicular to the thickness of the graticule, on the

around it.

  In order to make maximum use of the luminescent effect which results from the return of the reflected light to the lines made by etching, in the eye of the observer, in a preferred embodiment, the marks or drawings of the graticule are provided on the face of

  graticule located opposite the observer.

  According to another embodiment of the invention,

  both sides of the graticule are treated in such a way as to

  sea anti-reflective layers. This avoids a

  harmful degradation of the type existing in the case of graticules of the state of the art. The illumination device of the graticule may be constituted by one or more miniature lamps. In the case of graticules of fairly large size, the illumination device can

  also be a ring lamp arranged outside-

  is lying. For particular purposes, the illumination may be

  also performed using a beta light without current.

  Hereinafter will be explained in detail one embodiment of the object of the invention given to

  by way of example, with reference to the accompanying drawings.

  FIG. 1 represents a plan view of a gratuity

according to the invention.

  Figure 2 schematically shows a device

  illuminator comprising a graticule according to the invention.

  The graticule 1 is illuminated internally on its thickness, from its edge, by four small lamps 2. The graticule 1 comprises marks or drawings 3 made

by scratching or chemical etching.

  FIG. 2 shows in a visible manner in section the lines 3 located in recess and which are arranged on the face 4 of the graticule 1, which is located at

  the opposite of the observer. The reference figures 5

  symbolically the fact that the graticule 1 is treated so as to have an anti-reflective layer on both sides. Moreover, the observation device is represented diagrammatically by a field lens 6 and by an observation eyepiece 7, the reference numeral 8

designating the eye of the observer.

  In the exemplary embodiment shown on the

figure, the graticule is glass.

Claims (3)

  1. Illuminated graticule, arranged in the plane of development of optical observation devices and comprising   any markings or designs, preferably one   sin of the image field of a camera viewfinder, characterized in that the reference marks (3) are formed on the graticule (1) by scratching or etching and that the graticule (1 ) with drawings   (3) is artificially lighted from the edge of by at least one lamp (5).   2. Graticule according to claim 1, characterized in that the drawings (3) that carries the graticule (1), are arranged on the face (4) located on the opposite side to that of the observer.   3. Graticule according to one of claims 1 or 2,   characterized in that both faces of the graticule (1) are   treated so as to have an anti-reflection layer.