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US 3,961,315 AGranted
Information recording system
AssigneeCanon Kabushiki Kaisha
InventorNoboru Yokoyama
Life of this patent
Estimating the term…
Abstract
An information recording system is disclosed in which a digital information recorded on a recording medium is read out, and the digital information is converted into optical patterns with darker and light densities so as to represent the logic "1" and "0." Thereafter the optical patterns are recorded on a microfilm as the dark and light images which represent the logic "1" and "0" and are available for timing or sync signals.
Claims18
A micro-film, having thereon digital information comprising:
- a. a film having a base of a first density;
- b. the film having images of a first and a second optical density different from said first density and corresponding to the logic level of the digital information;
- c. the film having the dark and the light images indicated by said second and third densities for said digital information being arranged intermittently and in spaced apart relation along the recording direction of said digital information;
- d. the film having timing signals, for indicating the positional location of said dark and light images, recorded with a level common to said dark and light images representing said digital information.
1 more element
A micro-film comprising:
- a. dark and light images having a first density and a second density representing the digital information arranged adjacently and alternately along the recording direction;
- b. said dark and light images have first and second widths different from each other, corresponding to the logic level of said digital information along the direction of recording;
- and
- c. timing information for indicating the location of said dark and light images being indicated by the boundary of said dark and light images.
1 more element
An information recording system for recording digital information upon a micro-film comprising:
- a. a digital information source for generating digital information;
- b. a micro-film having a base of a first density;
- c. optical beam generating means for recording the information from said digital information source upon said micro-film;
- d. control means for controlling the brightness and the location of said optical beam from said optical beam generating means to record said digital information intermittently in the recording direction as dark and light images, which are different from said first density;
- said control means further including,
- i. intensity modulating means, connected to said optical beam generating means, for modulating said optical beam to first, second and third brightnesses different from each other, wherein the second brightness and the third brightness correspond to the digital information from said digital information source, and
- ii. deflecting means, operable in synchronism with said modulating means, for locating said optical beams along the recording direction so that said second or third brightness beams are alternately repeated with respect to said first brightness optical beam.
4 more elements
An information recording method for recording digital information upon a micro-film comprising:
- a. a first step for generating onto said micro-film optical beams modulated to first, second and third brightness in the sequence of the generation of the digital information;
- wherein said second brightness and third brightness correspond to the logic level of said digital information;
- b. a second step for deflecting said optical beam synchronized with the generation of said optical beam;
- wherein said deflection determines the location of said optical beams of said second brightness and third brightness with respect to said first brightness alternatively and repetitively in the direction of the recording;
- c. a third step for recording said modulated and deflection optical beams in the form of dark and light images upon said microfilm having a base of a first density by projecting and exposing thereon, wherein said dark and light images have a second and a third density corresponding to said second brightness and said third brightness which are different from the first density, and said images whose density levels are common to said dark and light levels are recorded intermittently in the direction of recording for indicating the timing signal.
2 more elements
An information recording method in accordance with calim 12, wherein
- said first step further includes, generating a series of repetitive signals simultaneously with the generation of said digital information, and modulating said optical beam in synchronism with said repetitive signal, said second step further includes, modulating said optical beam by said repetitive signal.
An information recording method for recording digital information upon a micro-film, comprising:
- a. a first step for generating an optical beam modulated to a first brightness and to a second brightness in sequence corresponding to the generation of digital information, wherein the optical beams having the first brightness and the second brightness are generated alternatively;
- b. a second step for deflecting said optical beams synchronized with the generation of said optical beams, wherein said deflection positioning of said optical beams in the recording direction have different first and second deflection widths;
- c. a third step for exposing said modulated and deflected optical beams upon said micro-film and recording thereon as dark and light images, wherein, said dark and light imges have their recording width corresponding to said first and second deflected width and the boundary of the dark and the light images are recorded adjacently in the direction of recording so as to indicate timing information.
Dependencies are inferred from the claim text.