Patent GB-653393-A (GB)
Title: Improvements in and relating to apparatus for taking photographs giving the impression of relief and movement
IPC: G03B35/24
Filed: 1947-08-29
Abstract: 653,393. Zoetropes, multiple photograph cameras; stereoscopic photography. RELIEPHOGRAPHIE, SOC. POUR L'EXPLOITATION DES PROCEDES DE PHOTOGRAPHIE EN RELIEF M. BONNET. Aug. 29, 1947, No. 24002. Convention date, May 25, 1946. [Classes 97 (i), 98 (i) and 98 (ii)] Apparatus for taking photographs giving the impression of relief and movement, comprising a lenticular screen with spherical elements, or two screens with cylindrical elements having their cylindrical axes in parallel planes and arranged at 90 degrees to each other, placed in front of a removable negative plate on which the photograph is to be taken or a plate bearing said lenticulated screen on its front surface and a light-sensitive layer on its rear face, is characterized by the combination of an objective lens of large diameter, a horizontal row of beaminverting members for effecting reversal of the recording beam either horizontally or horizontally and vertically, and a shutter with a horizontal slot movable perpendicularly to and across this row, and means for obtaining the juxtaposed recording in the vertical direction of the image points produced by the lenticular screen. This juxtaposed recording in the vertical direction may be effected either by pivoting the unit comprising the lenticular screen and light-sensitive surface about a horizontal axis in synchronism with the movement of the shutter or by effecting sliding of the lenticular screen relatively to the light-sensitive surface in a vertical direction. As shown, a camera is provided with a stationary objective 2 comprising two plano-convex lenses with a horizontal rectilinear row of beam inverting prisms arranged between them, a part-cylinder form shutter 22 having a horizontal slit 23 and supported by sector-plates 21 fixed on a pin 20 pivotally mounted in the camera walls, and a carrier 3 pivoted in the camera at 4 for a lightsensitive plate and either a screen having spherical lenticulations or two perpendicularlycrossed cylindrically lenticulated screens having their cylindrical axes in parallel planes. An electric motor 12 drives through a reduction worm a pulley belt 10 which rotates a pulley 9 on a shaft 8. This shaft also carries (1) a cam 13 which controls the movement of the shutter by means of a follower roller 15 carried by one arm of a lever 16 mounted in the casing at 17, the other arm of which through a link 18 rotates an arm 19 secured to the shutter sector plate; and (2) a pulley 7 around which passes a belt 6 fixed to the the ends of a quadrant 5 attached to the pivot pin 4 and carrying the frame for the photographic plate and lenticular screen. At the end of an exposure, the arm 16 operates a switch 24 stopping the motor 12. The exposed plate is then removed and the shutter re-set by momentarily energizing the motor so that the follower 15 slips down the nose of the cam 13. Instead of a cylindrical shutter with a horizontal slot a vertically moving roller blind shutter may be used having tapes driven by the shaft which effects pivoting of the lenticular screen and light-sensitive surface. In order to obtain prints with an appearance of true relief, the negative having been produced on an ordinary removable flat plate in a camera employing " simple " members inverting the beam only horizontally, a lenticular screen with cylindrical elements bearing an emulsion layer on its rear face is placed with this layer in contact with the image-bearing face of the negative and the two adjusted as described in Specification 622,919, the screen on the print so produced being then covered by a second cylindrical screen crossing the first at 90 degrees and secured in place by a frame or like means. If the negative is produced on a flat plate in a camera having " double " members inverting the beam both horizontally and vertically, the print is made in the ordinary way on a flat plate and covered with crossed cylindrically lenticulated screens, while, when printing from a lenticulated negative plate, the print is made on a lenticulated positive plate if " double " inverting members were employed in the camera, or on a flat positive if " simple " inverted members were used. Specification 639,406 is referred to. The Specification as open to inspection under Sect. 91 states that instead of the continuous recording of successive positions of the objects different objects may be recorded in turn. This subject-matter does not appear in the Specification as accepted.