DE382408C - Glass body for the optical compensation of image migration in cinematographs - Google Patents

Description

GERMAN EMPIRE

ISSUE AI OCTOBER 2, 1923

.REiCHSPATBNTAMT '

PATENT LETTERING

CLASS v57a GROUP 37

; (H8 _S53 i VT / s? * ² )

" " ■ - ". ' Karl Hansen and Alex Binder in BeriinV Glass body for the optical compensation of the image migration in cinematographies, patented in the German Reich on May 22, 1921.

The invention relates to acts the special] before Direction edge. Figs. I, 2 and 3 show

Training for an optical equalization | a section through the glass body α im

the image migration in cinematographs j beam path in three different positions

serving circumferential pane of glass, which is after ί in the same. Fig. 4 shows the glass

Kind of a prism with variable bre- (body in two beveled surfaces according to to

Claim ι, in the plan (Fig. 4) and in the view (Fig. S). Each of the ground effective surfaces must be a straight surface, the generators of which are parallel to a plane (Fig. 5, b) and intersect a straight line perpendicular to this plane (Fig. 5, c) at right angles. If this surface is intersected by the surface of a rotating cylinder (Fig. 5, d), the axis of which coincides with the straight line perpendicular to the above-mentioned plane (Fig. 5, c), and if the jacket of this cylinder surface is unwound on a plane, then the lines of intersection of the cylinder surface with the straight line of a surface under consideration merge into a circular arc, the axis of which coincides with one of the generatrix of the straight line of the cylinder jacket.

A modification is possible in such a way that on the glass body (Fig. 6), instead of the straight surfaces, concave or convex surfaces are ground, the generators of which are the circular arcs of chords, which in a circular plane (Fig. 6, e) as radii

and intersect a straight line perpendicular to this plane at the same arc height. If this surface is intersected by the surface of a rotary cylinder (Fig. 6, /), the axis of which coincides with the straight line perpendicular to the above-mentioned plane (Fig. 6, g) , and if the jacket of this cylinder surface is unwound on a plane, then the line of intersection of the cylinder surface with the generatrix of the convex or concave surface merges into an arc, the axis of which coincides with one of the generators of the straight line of the cylinder jacket.

The glass bodies can also be applied so that two of these are more congruent Bodies are cemented with their flat surfaces (Fig. 7). In order to apply this To be able to fix any distortions of the projected images that occur a fixed glass body can be switched on in front of the rotating glass body, which is too has the opposite curvature to the rotating vitreous. The vitreous can with Using an appropriate type of glass, be ground so that the cutting line of the Cylindrical surface with the generatrix of either convex, concave or straight surface merges into a parabola or hyperbola. Instead of a glass body with two beveled surfaces, one can also be used with any number of surfaces. To the number of sanded surfaces then also determines the speed of rotation of the glass body to the running speed of the film.

Claims (3)

60 patent claims: i. Acts in the manner of a prism with a variable refracting edge Glass body for optical compensation of image migration in cinematographs, marked by ground straight surfaces, the generators of which are all parallel to a plane and a on this plane perpendicular straight lines intersect at right angles, so that when this surface passes through the surface of a Rotary cylinder whose axis coincides with the straight line perpendicular to the plane mentioned coincides, is cut, and the jacket this cylinder surface on a Plane is developed, the line of intersection of the cylinder surface with the considered Straight line of a surface merges into a circular arc, the axis of which with a generating line the straight line of the cylinder jacket coincides. 2. Glass body according to claim 1, characterized by bevelled concave or convex surfaces, all generators of which are the circular arcs of chords that lie in a circular plane as radii and intersect a straight line perpendicular to this plane at the same arc height, so that when this surface passes through the surface of a rotating cylinder, _go its axis on said circle plane perpendicular line coincides, is cut and the sheath of the cylindrical surface is unwound on a plane, passes over the line of intersection of the cylindrical surface with the generatrix of the convex or concave surface in a circular arc, whose axis one of the generatrix of the straight line of the cylinder jacket coincides. 3. Optical compensation, characterized in that the glass body according to claim ι or 2 are cemented in pairs with their flat surfaces .. For this purpose ι sheet of drawings.