Microfilm card and a microfilm reader with automatic stage positioning
1984
Online
Patent
A microfiche and a microfilm reader comprising automatic positioning of the film stage, characterized by the following features
(a) the microfiche (MFK) is provided with an index (2) of the information present in its individual images and of their x,y coordinates in optically coded form and with a timing track (4)
(b) the reader comprises a read head (19) with electronic-optical sensors to read the optically coded index on the microfiche (MFK)
(c) an electronic read/write memory (20) for storing the index (2) is connected to the read head (19)
(d) provision is made for an alphanumeric keyboard (27) to feed-in a search concept (search key) and followed by an encoder (26) and a register (25) for storing the coded keyboard input
(e) a comparator (24) is connected to the memory (20) of the index (2) and the register (25) of the coded keyboard input, which determines the agreement between the search key and a concept present in the index
(f) the comparator (24) and the memory of the index are followed by appropriate switching means (28;29;30;31;40;41) which in turn are followed each by a digital/analog converter (32;33) to generate each an analog DC potential corresponding to the x and y coordinates respectively of the film image containing the search key
(g) a follow-up circuit consisting of a DC motor (36;37), a servo-potentiometer (38;39) and a differential amplifier (34;35) is provided for each coordinate for the purpose of positioning the film stage and is fed with the DC potential at the outputs of the analog/digital converters (32;33).
Titel: |
Microfilm card and a microfilm reader with automatic stage positioning
|
---|---|
Autor/in / Beteiligte Person: | Rinn, Jurgen ; Belitz, Fritz |
Link: | |
Veröffentlichung: | 1984 |
Medientyp: | Patent |
Sonstiges: |
|