Dual screen system

• US 4,609,253 A
• Filed: 10/04/1983
• Issued: 09/02/1986
• Est. Priority Date: 10/05/1982
• Status: Expired due to Fees

• Current Assignee: Zoran Perisic
• Original Assignee: Zoran Perisic
• Inventors: Perisic, Zoran
• Primary Examiner(s): Corbin, John K.
• Assistant Examiner(s): DZIERZYNSKI, PAUL M
• Application Number:
  US06/538,923
• Time in Patent Office: 1,064 Days
• Field of Search: 350/169, 350/171, 350/172, 350/174, 353/30, 353/34
• US Class Current: 359/629
• CPC Class Codes: G02B 27/143 using macroscopically faceted or segmented reflective surfaces
• CPC Class Codes: G03B 15/12 using mirrors

Abstract

A dual screen filming apparatus has a fully reflective mirror positioned in the optical path of part of a projected image at an angle of 45°. The mirror reflects the part of the projected image onto a first front projection screen set at 90° to the path of the reflected image. The mirror also has a non-reflecting portion which lies in the path of the remainder of the projected image and is arranged to allow the light to pass therethrough without reflection onto a second front projection screen. The light reflected from the first and second screens is collected by a semi-reflective mirror, positioned intermediate the projector, and the fully reflective mirror and is directed into the lens of a camera to provide a composite image.

Claims

1. A method of dual screen filming comprising projecting an image positioning first reflective means in the optical path of the projected image at an angle thereto so as to reflect only a portion of the projected image onto a first front projection screen, positioning a second front projection screen in the optical path of the portion of the projected image unreflected by the first reflective means, and collecting the portions of the projected image reflected from the first and second front projection screens upon a second reflective means which directs the light into the lens of a camera whereby a composite image is formed.

2. A method of dual screen filming comprising projecting an image, positioning a fully reflective means in the optical path of the projected image at an angle of 45°

thereto so as to reflect only a portion of the projected image onto a first front projection screen set at 90°

to the path of the reflected light, providing the fully reflective means with a non-reflective area, positioning a second front projection screen in the optical path of the unreflected portion of the projected image which passes through the non-reflective area and at an angle of 90°

to the path of the unreflected portion of light, collecting the portions of the projected image reflected from the first and second front projection screens upon a second, semi-reflective, means set at 45°

to the reflected light path and in the optical path between the projector and the first reflective means, the projected beam passing therethrough upon its passage to the first reflective means, and reflecting the collected light into the lens of a camera whereby a composite, image is formed.

3. Dual screen filming apparatus comprising first reflective means for positioning in the optical path of a projected image at an angle thereto and arranged so as to reflect only a portion of the projected image onto a first front projection screen, a second front projection screen for positioning in the optical path of the portion of the projected image unreflected by the first reflective means, and second reflective means for collecting the portions of the projected image reflected from the first and second front projection screens and for directing the collected light along the optical axis of the lens of a camera.

4. Apparatus according to claim 3 wherein the first reflective means comprises a fully reflective mirror.

5. Apparatus according to claim 4 wherein the mirror has a portion thereof uncoated so that a portion of projected light passes therethrough.

6. Apparatus according to claim 3, wherein the second reflective means comprises a semisilvered mirror.

7. Apparatus according to claim 3 wherein the first reflective means is a fully reflective mirror having its upstream surface reflectively coated, the second reflective means is a semi-silvered mirror with its downstream surface reflectively coated, the first reflective means has an area which is uncoated for light to pass through unreflected, the first and second screens are positioned at 90°

to another, and the first and second reflective means are parallel to one another and positioned at 45°

to each of the first and second screens.

8. Apparatus according to claim 3 including lens means between the first reflective means and the second screen.

9. Apparatus according to claim 8 including neutral density filter means between the lens means and the second screen.

10. A beamsplitter assembly for a dual screen system providing automatic masking comprising a first reflective surface means and a substantially parallel second reflective surface means, the first reflective surface means having a portion thereof fully reflective with the reflective surface confronting the second reflective surface means and a non-reflective portion through which light may pass, and the second reflective surface means being semireflective and having its reflective surface confronting the first reflective surface means.

11. An assembly according to claim 10 wherein the first reflective surface means comprises a fully silvered mirror part of which is not coated to provide the non-reflective portion.

12. An assembly according to claim 10 wherein the first reflective surface means includes a fully reflective surface which does not extend over the entire area to be covered by a beam of light projected by a projector, the non-reflective portion comprising the uncovered area.

13. An assembly according to claim 10 wherein the first reflective surface means is movable in two-dimensional coplanar displacement by orthogonally-arranged pairs of traverse bars.