SU13282A1 - Automatically set the plate in focus for a camera with a non-chromatic lens - Google Patents

Description

A disadvantage when taking photographic cameras with a non-achromatic lens and with fur is the need to perform additional manipulation of moving the frame with frosted glass to the lens, by the magnitude of the focal difference, to place the plate in the focus of the camera, in order to get a clear picture.

The present invention aims to eliminate this drawback by using in these photo cameras a constructive relationship in the position of frosted glass, when the stretch of the fur changes, from the position of the slat sliding along an inclined plane and the arms articulated with it are articulated with pressed to the levers by a spring. The variable distance between the ground glass and the plate is kept equal to the focal difference, due to the appropriately selected levers and the slope of the inclined plane.

In FIG. 1 shows a side view of a photo camera —and the proposed device with the cover removed; FIG. 2 is a top view.

The device of the proposed device is as follows. O inclined plane e attached to the back

parts of the chamber, they are assembled by a roller rail, articulated by means of hinges and with two shoulders levers, rotating on the axles attached to the wall of the chamber. With the free ends, the levers of the frame abut against the frame with the frosted glass. The frame a is made somewhat wider than the cassette 5, and reaches to the cover of the city. The cassette S is inserted in the usual cut-out of the rear camera. The spring presses the frame a to the free ends of the arms e, and in the absence of the frame a - a cassette about to the notch of the back of the chamber. When the rear part of the camera moves backward, the slider roller rolls along the guide rail e, the rail slide rises, the levers 3 turn on the axles and push the frame with the frosted glass backward, increasing the distance between the latter and the cutout for the cassette. When reversing the rear part of the chamber, the rail 5 / s is lowered, the levers 3 release frame a, and nosledn, by spring pressure B, moves forward to the notch of the cassette. The arms of the arms 3 and the steepness of the inclined plane e are made such that, for any position of the rear part of the camera, the distance between the frosted glass and the plate embedded in the cassette is always equal to the corresponding focal difference. If focusing is achieved by dubbing the center of the Kdmer bearing the lens, then the inclined plane e must be attached to the front of the camera.

Subject Pater t a.

An automatic device for adjusting the plate in focus for a camera with a non-achromatic lens, which is characterized by the application to move the ground glass when changing the stretch of the fur, the inclined plane e attached to the front or rear of the camera, and we equipped with a roller supported by an acronym plane, and articulated with hinges and, and with levers s, s, on which, under the action of the spring c, rests the frame a with frosted glass.