Method of and apparatus for manipulating line weight in an image
US4105328A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 29, 1976 |
| Grant date | Aug 8, 1978 |
| Priority date | — |
| Expiry date | Jun 29, 1996 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01C11/00
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An image-bearing medium (negative or positive) is located over and in close proximity to a light-sensitive film. During exposure, the film is moved in circular orbits parallel to the medium to cause spreading of image lines projected onto the film. To ensure uniform line spreading, the diameter of each successive circular orbit is increased toward a predetermined, maximum diameter, and the film is exposed during each orbit. The film is supported on a mobile table which is mounted, through a frictionless bearing, to a horizontal platform. The platform in turn is keyed to a vertical rotor. As the rotor is rotated by a drive motor, the table is caused to move in a circular orbit about the axis of rotation of the rotor. The diameter of the orbit, determined by the eccentricity of the axis of rotation of the horizontal platform with respect to the axis of rotation of the rotor is precisely controlled by a vertical rack and pinion mechanism. The position of the rack and pinion mechanism is determined by a stepping motor, and the diameter of each orbit is read out directly from a stepping motor encoder. In order to prevent rotation of the table during orbiting, the table rides on an inter…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.