• US 3,765,742 A
  • Filed: 06/07/1972
  • Issued: 10/16/1973
  • Est. Priority Date: 06/07/1971
  • Status: Expired due to Term
First Claim
Patent Images

1. A device to produce, starting with a slit scanning in its transverse direction, alternately two slits scanning at a certain angle to each other in their transverse directions in a common image plane, comprising a scanning slit, a first and a second optical system with image-turning means, a transmitting disk provided with a reflecting layer covering certain parts of one lateral surface of the disk, said disk being arranged so that it rotates about an axis perpendicular to the lateral surface so that the light from said scanning slit alternately first is reflected on a first portion of said reflecting layer, whereupon it passes through the first optical system and is reflected on a second portion of said reflecting layer so that the image of the slit generated by the first system falls into a common image plane, and secondly the light from said scanning slit is transmitted through the disk, whereupon it passes through said second optical system and is again transmitted through said disk so that the image of said slit generated by the second system falls into said common image plane, said scanning slit being so oriented and said image-turning means in said first and second optical systems being so arranged that the desired angle is obtained between said two scanning slit images generated.

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