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Lens Arrangement for Flying Spot Stores

IP.com Disclosure Number: IPCOM000073575D
Original Publication Date: 1971-Jan-01
Included in the Prior Art Database: 2005-Feb-22
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Chapman, DW: AUTHOR [+3]

Abstract

Lenses are used to image the spot in flying spot stores. The cost of such lens systems may be reduced while improving efficiency in either of two ways. In A is shown a CRT flying spot store 1 and a series of lenses 2 mounted in a curved support plate 3. If the lenses are mounted with their optical axis perpendicular to the support plate, the use of a curved support plate will reduce the required angular field of view required of the lens compared with the case where the lenses are mounted in and perpendicular to a flat support plate. For example, with a 12'' x 12'' raster containing 1000 x 1000 (10/6/) spots, a half angle correction of 11.5 degrees on a 20 x 20 lens array is sufficient to provide adequate angular correction over the raster face, if a spherical support plate is used.

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Lens Arrangement for Flying Spot Stores

Lenses are used to image the spot in flying spot stores. The cost of such lens systems may be reduced while improving efficiency in either of two ways. In A is shown a CRT flying spot store 1 and a series of lenses 2 mounted in a curved support plate 3. If the lenses are mounted with their optical axis perpendicular to the support plate, the use of a curved support plate will reduce the required angular field of view required of the lens compared with the case where the lenses are mounted in and perpendicular to a flat support plate. For example, with a 12'' x 12'' raster containing 1000 x 1000 (10/6/) spots, a half angle correction of 11.5 degrees on a 20 x 20 lens array is sufficient to provide adequate angular correction over the raster face, if a spherical support plate is used. A 15'' x 15'' raster requires a 15o half angle correction with a spherical support plate.

Alternatively, an approach may be taken to reduce the angle between the CRT normal and the lens axis as shown in B. By rotating the lens clockwise about an axis perpendicular to the 45 plane shown, what would otherwise be an
18.67o angle between the CRT face and the lens axis is reduced by 2.7 degrees. Thus, the rotation allows an additional 1.4 lens positions. Since the magnification will be changed by just a rotation, a translation will also be required to adjust the magnification. The effect of this is to further reduce the field angle required, thus sli...