Spotfilming apparatus
US4380819A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 24, 1980 |
| Grant date | Apr 19, 1983 |
| Priority date | — |
| Expiry date | Nov 24, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B42/025
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A masking apparatus and palpitator cone drive system for an X-ray spotfilming device. The masking apparatus comprises first and second pairs of shutter-like members mounted for reciprocating movement in two mutually orthogonal directions. Each mask member of the second pair includes first and second relatively moveable elements that operate in a telescope-like manner. A drive system including a reversible motor and a feedback potentiometer actuates the elements at first and second speeds so that the elements reach their retracted and extended positions simultaneously. The cone drive system includes a drive motor, a drive belt and drive assembly for driving the cone between retracted and operative positions. A cone lock is engageable with a keeper located at a cone-advanced position of the drive assembly and is released by the drive belt whenever the drive motor is energized in the cone-retracting direction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.