Linear shutter and method to achieve uniform density of image elements of a 3-D photograph
US5019855A · kind A · utility
13Cited by
2References
15Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 17, 1989 |
| Grant date | May 28, 1991 |
| Priority date | — |
| Expiry date | Aug 17, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B35/04
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A method and apparatus for achieving uniform density of image elements of a 3-D photograph by using a 3-D printer with a linear motion blade shutter which travels at varying speeds during printing a negative view to control the duration of exposure across the 3-D photograph. The scanning speed of the linear shutter is varied during the exposure of each of the 2-D negative views and is based upon the position of the 2-D negative view in relation to the field of illumination of the enlarging lens in order to compensate for the non-uniformity of illumination due to the vignetting effect.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.