The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 19, 1988
Filed:
Nov. 06, 1986
Ulrich Zeth, Jena, DD;
Jenoptik Jena G.m.b.H, Jena, DD;
Abstract
A method is provided for determining and indicating a supply of film remaining in an aerial photography camera, which results in greater measuring precision and improved indication options. While film is advanced during a film step from a film feed spool through a film advancing device to a film take-up spool, pulse counts are taken by coded discs connected to each of the film feed spool and film advancing device. These pulse counts and the length of film advanced during the film step are then used to determine the total circumference of the film on the film feed spool. The total circumference and film thickness are then used to determine the number of film windings remaining on the film feed spool. Finally, the number of remaining exposures of film and the remaining length of the film are determined from the number of remaining windings and both are indicated at an indicator unit.