Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pentacon GmbH Foto und Feinwerktechnik
Original Assignee
Pentacon Dresden VEB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Pentacon Dresden VEBfiledCriticalPentacon Dresden VEB
Priority to FR983875ApriorityCriticalpatent/FR1406774A/fr
Application grantedgrantedCritical
Publication of FR1406774ApublicationCriticalpatent/FR1406774A/fr
G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
G03B21/00—Projectors or projection-type viewers; Accessories therefor
G03B21/14—Details
G03B21/53—Means for automatic focusing, e.g. to compensate thermal effects
Landscapes
Physics & Mathematics
(AREA)
General Physics & Mathematics
(AREA)
FR983875A1964-07-311964-07-31Dispositif automatique de focalisation pour projecteurs
ExpiredFR1406774A
(fr)