Abstract The present invention relates to a device to produce, starting from a slit scanned in its transverse direction, alternately two slits scanned at a certain angle to each other in their transverse directions in the same image plane. Starting with the slit scanned in its transverse direction, the device in accordance with the invention produces two slits scanned at a certain angle to each other in their transverse directions in the same image plane. This slit scanned in its transverse direction may be generated, for example, by means of a device comprising a straight, equilateral, transmitting polygonal cylinder placed behind a stationary slit which is arranged to rotate about its axis of symmetry parallel to the longitudinal direction of the slit. The two slits scanning in the same image plane at a certain angle to each other in their transverse directions are generated by means of the device built in accordance with the principles of the present invention by dividing the light alternately in time between two alternative ray paths. The device including a rotating glass disk with reflecting areas being used for the division and the ray paths have such optical characteristics that the timing of the scanning slits is not affected by wobble in the bearings of the rotating glass disk.
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.
Claim 2
Independent Claim
217 words
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.
Claim 3
Dependent Claim
39 words
A device in accordance with claim 1, wherein said first and the second optical system are so designed that they are substantially telescopic on the object side and on the image side, and their angular magnification is substantially unity.
Claim 4
Dependent Claim
19 words
A device in accordance with claim 1, wherein said first and second portions of reflecting layer are semicircular rings.
Claim 5
Dependent Claim
19 words
A device in accordance with claim 1, wherein said first and second portions of reflecting layer are quarter-circular rings.