Abstract Apparatus for retrieving a particular microfilm document image from a film strip having a plurality of document images and an identifying code field for each such document image. Each identifying code field includes a plurality of binary information positions, with each such position having a selectable contrast (viz., light transmission capability) to either pass or substantially block light. The apparatus includes a reader station having a plurality of actuatable light sources, each light source being located relative to a particular bit position of an aligned code field in the reader station and operative when actuated to illuminate such position. The apparatus further includes a memory unit for storing information corresponding to a code field which identifies a particular document image and logic circuitry coupled to the storage unit for actuating particular light sources which correspond to those bit positions which substantially block light in the particular document image and a photosensitive device responsive to the absence of light passing through a document code field to indicate whether the particular document image is at the reader station.
Inventors
👤 A Baker
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-10-26 03:57
CPC Classifications
G; G06; G06K; G06K17/00
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
193 words
In automatic retrieval apparatus including means for positioning an information bearing medium having at least one information image and an identifying code field disposed adjacent thereto to align such code field in a reader station, the identifying code field having a plurality of information bit positions, with each position being selected to either pass or substantially block radiation in a predetermined portion of the spectrum, the apparatus further having means for storing in a memory unit a code field having an information content which identifies a particular information image, the combination comprising: a. a plurality of actuatable light sources of radiation at said reader station, each of said sources being operative when actuated to illuminate a particular bit position of an aligned code field; b. means actuatable by said memory unit for actuating those particular ones of said light sources which would be substantially blocked by an aligned code field corresponding to the particular information image; and c. photosensitive means disposed at said reader station and responsive to the absence of radiation from said actuated light sources for producing a signal indicating that the aligned code field corresponds to the particular information image.
Claim 2
Dependent Claim
193 words
In automatic retrieval apparatus including means for positioning an information bearing medium having at least one information image and an identifying code field disposed adjacent thereto to align such code field in a reader station, the identifying code field having a plurality of information bit positions, with each position being selected to either pass or substantially block radiation in a predetermined portion of the spectrum, the apparatus further having means for storing in a memory unit a code field having an information content which identifies a particular information image, the combination comprising: a. a plurality of actuatable light sources of radiation at said reader station, each of said sources being operative when actuated to illuminate a particular bit position of an aligned code field; b. means actuatable by said memory unit for actuating those particular ones of said light sources which would be substantially blocked by an aligned code field corresponding to the particular information image; and c. photosensitive means disposed at said reader station and responsive to the absence of radiation from said actuated light sources for producing a signal indicating that the aligned code field corresponds to the particular information image.
Claim 3
Dependent Claim
16 words
The combination as set forth in claim 1 wherein said photosensitive means is a single photocell.