DE347502C - Device for the optical compensation of the film movement - Google Patents

Description

(Ζιι8 _3Ί

The invention "creates" a new device for optical compensation · of the film movement · for a Kiniematographeni with uniformly running film available. "This new device contains two lens systems, of which the one (ι), • that has the greater distance from the film, from a plurality of adjacent, under the same lens sizes

ίο consists, which are movably arranged, and it is true, depending on whether its effect is a gathering or a dispersing one, - so that jeidhe group in theirs. Middle position in which its optical axis coincides with the main axis of the kinernatographic apparatus, has a direction of movement equal to or opposite to that of the film, and of which - also the one (2), dqjs the smaller one Removal of the 'film has, either

A single, fixedly arranged lens group is made up of a plurality of adjacent lens groups of any one which are identical to one another. There are thickness preferences which are movably anoridtaet so that each group in its central position, in which its optical axis coincides with the main axis of the indeniatographic apparatus, has a direction of movement which coincides with that of the film. In doing so, 'the speeds' (V ₁ and z / _a ) of the two lens systems, the focal lengths (^ ₁ and / V) of the various lens groups and the mutual distance (d) of two interacting groups of lioses in their middle

€ "'

tion under the prerequisite of infinitely thin lenses is chosen so that the equation

fi <t = U

is fulfilled, so that a light beam directed parallel to the main axis of the cinematographic apparatus experiences a parallel shift in the direction of the film movement when passing through the lens systems. In the case in which that second lens system (2) is embodied by a single, almost arranged lens group, with its speed v ₂ thus assuming the value zero, the further equation following from equation 1 must be satisfied.

(2) i = u

In either case, in order for the speed of that translation to be equal to the speed (ν) of the film as required, the following must be used
will:

fx

g )

Equation met

The following four special cases can be derived from equation 3: If one chooses f _t = d, then V ₁ = ν must be; if one chooses - Z ₁ = d, then - V ₁ = ν must be; if one chooses V ₁ = v ₂ , then f _± == d = f _{2 must} be (in this case the two lens systems thus form a telescopic system); if one chooses V ₁ = - v _v then f _t = - (d - / ₂ ) must be.

847502

The mentioned lens groups can be made from any number of individual links exist. The prescribed movement ■ the lens systems from! Movably arranged Lens groups is z. B. thereby 'enables that the lens groups are arranged on an endless belt that extends moves parallel to the FHm. To avoid the trouble of using this tape yourself If mechanical difficulties arise, it is advisable to place the lens groups on one Drum whose axis of rotation is parallel to the film and is in the direction of movement of the Film is vertical, to be arranged so that their optical axes are the axis of rotation of this Cut the drum vertically.

Alignment devices of this type can be used both for recording as also for one for projection, tastitn-mtfcen Use cinematographs. In the latter case, you can do so on the Bieleudhtiungsseite as well as on the projection side of the cinematograph. As well as Linsentrornmeiln as well as lentil bands are for balancing devices already, been used several times, but always with different ones Purposes than sought by the present invention.

A device is shown in FIGS. ¹ and 2, which is intended for compensation on the lighting side for a projection kinematograph. Fig. Ι is an elevation, Fig. 2 - a plan. A drum α is rotatably mounted on a base plate G about an axis XX by means of a shaft a °. The drum contains six aneinandiengrenzenidie converging lenses · al, whose optical axes lie in bucket perpendicular to the axis XX plane and intersect the axis XX. A simple mirror prism b protrudes into the interior of the drum α and is attached to the base plate G in such a way that its main section is parallel to the axis of rotation XX of the drum. The prism serves to transmit the light coming from the condenser (which is not shown for the sake of simplicity and whose axis is to be thought of as lying in the axis XX ) of the cinematograph, i.e. the lens © dl of the drum a , through the film F . In doing so, it steers the condensation ^{axis by 90 °} into the axis FF aib. A second Trotte mel c is mounted loosely rotatably about its axis of rotation ZX on the drum α and contains 20 mutually adjacent lines of confusion c ¹ (. The optical axes of these lie in the plane defined ^{by the optical axes of the converging lenses ff 1 and intersect} the axis XX. Between the drums α and ' c are two lenses which are fixed on the base plate G so that their optical axes coincide with the axis YY , one of them, d, is a diverging lens and the drum α The other, e, is a converging lens and is adjacent to the drum c . These two fixed lenses serve to ^{cancel out the converging effect of the 1} lenses α ¹ and the destructive effect of the lenses c ¹ , so that when these lenses are moved only The movements of the drums α and c and this film F are indicated by arrows. The drums α and c receive their drive from a shaft / which is coupled to the film elt -zu Anken * is that its angular velocity has the value ν cm

30 cm

has, where ν is the in-

sec

expressed

Film speed served. Bin on the shaft / attached gear / ¹ engages in a gear α ² , which sits on the shaft a ° , the transmission ratio being chosen so that the shaft a °, and thus the Troin-

mel a, a Winfeelgesdiwindigikek learns about "Jjfctn". A second gear / ^{2 of} the shaft / engages in a toothing c ^{2 of} the drum c , with such a choice of the transmission ratio that the drum c has a Wmkel-

! y

speed of being granted. the

j in mm, expressed focal lengths, radii, thicknesses and mutual. Distances of the used Lenses are 'from the following Ta-! Belle can be seen:

In the drawing, the drums take a and c a a position such that 'the, d through the prism h 90 ^0! Broken condenser axis when By setting the Linsi Systems al ·, e, c ¹ their position does not change movers, the drums and the Film in the indicated arrow directions and with the indicated speeds, -so '. After a certain time the separating edge of two adjacent lenses a1, the nominal edge of two adjacent lenses c ¹ and the continuous edge of two adjacent film images are in the axis YY { in the middle of the beams ^ - field) during the ¹ Kondiensorachsie a Parallelver'S'etzung by half the film pitch

Focal lengths = 276.133 γ! Radii Distances and
Thick = 0.821 , η = -271.981 _y a = 295.71 m ¹ = 34.354 fd = "127.744 γΖ = 95.328 m ^Ä = 1.223 fe = - 121.442 γ & = .96.149 in ^a = 15.5 η r ⁵ - 339 ^ ¹ 's ¹ = 5, o 7-6 = 107.183 S ² = 13.5 _r 7 =: 149.003 S ³ = I ₁ O _r 8 = 150.226 S ⁴ = 101.014

in the direction of movement of the film.

Figs. 3 and 4 show a second exemplary embodiment of a device which is intended for compensation on the lighting side for a projection kinematograph. Fig. 3 is an elevation, - FIG. 4 rain floor plan. A drum g is mounted on a base plate G about an axis UU nfrelibar by means of a shaft g °. The drum contains ACBT g ^1, whose optical axes lie in a plane perpendicular to the axis UU cut UNIDI the axis UU araeinandergr engende converging lenses'. A simple mirror prism h protrudes into the interior of the drum g and is fastened to the base plate G in such a way that its main section is parallel to the axis of rotation UU of the drum. The prism serves to "the light rays coming from the condenser (which for the sake of simplicity is not drawn and whose axis coincides with the axis UU ") of the projection cinematograph! Through the lenses g · ^{1 of} the drum g through the film F It directs the condenser axis through 90 ° in the axis VV afc. Between the drum g and the film there is a converging lens i, which is attached to the base plate G in such a way that its optical axis coincides with the axis VV The directions of movement of the drum g and the minus are indicated by arrows. The drum Jf is to be thought of as coupled with the film that its angular

speed the value asked where-

24 cm

cm

■ at ν the filmed avin- expressed in - ^ -

diigkedt biödieutet. The Brermweiten, radii, thicknesses and ¹ mutual distances of the LiniS'ßn used are shown in the following table:

Focal lengths

fg = 434.O65
fi = 95.286

Radii

r ¹ - 174.07
r ² = 102.042
r ³ = 00
i x ¹ = 50.025

Distances and thicknesses

m = 74.58 s ¹ = 17.2
s ² = 16.0

In the drawing, the drum niimmt g a such a position that through the prism h 90 ⁰ igöbrodhiene KondensDracihse when DurcJisietzen of Liinserasyistemis g ^1, i does not change its position. If the drum g and the film move in the indicated directions of the arrow and at the indicated speeds, after a certain time the separating elements of two neighboring lenses g ¹ and the thermal edge of two neighboring film images are in the axis VV (in the middle of the field of steel) , while the condenser axis has a parallel offset by half the film pitch in the direction of movement of the film.

Claims (1)

Patent claim: Device for the optical compensation of the film movement for a Kiriiematograph with uniformly running film, characterized by two lens systems, of which the one which is the greater distance from the film, a plurality of adjacent, identical lens groups which are movably arranged, depending on their effect is a collecting or a 'dispersing, so that each group in its central position has a direction of movement which is the same as or opposite to that of the film, and of which further that which the has a smaller distance from the film, contains either a single fixed group of lines or a plurality of in-line, identical lens groups, which are movably arranged so that each group in its central position has a direction of movement which corresponds to that of the film, wherein the speeds of the two lens systems, the focal lengths of the different Lens groups and the mutual distance ^{1 between} two interacting lens groups in their central position are chosen so that a light beam directed parallel to the main axis of the lens system experiences a parallel shift in the direction of the movement when passing through the lens systems. 1 sheet of drawings.