Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1994-06-14
1996-06-04
Dinh, Tan
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369 62, 360 3, 352 37, 352 27, 352 25, G11B 700, G03B 3100
Patent
active
055239960
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a method and an apparatus for recording information which may be conveniently employed for recording the voice information on a cinefilm by optically recording the voice information on a sound track of the cinefilm, for optically recording the desired information on an optical card, or thermally recording so-called bar codes as the recording information by light on a heat-sensitive recording medium. More particularly, it relates to a method and an apparatus for optically recording or photo-thermally recording the desired information by a laser beam radiated by a laser beam radiating means.
BACKGROUND ART
Heretofore, the voice information for cinema for a movie theater is recorded on the sound track provided on a right or left edge of a picture area of the cinefilm along the film running direction.
If a light source other than a laser source, such as an LED array or a halogen lamp, is employed, the output is low, sufficient luminosity cannot be achieved, and a lot of time is consumed in recording the information. However, if the usual laser beam is employed, a speckled noise is produced in an ultimate image thus seriously deteriorating the image-forming performance. The information concerning the speckled noise may be found in "Introduction to Fourier Optics", pages 131 to 134, by Joseph W. Goodman, McGrow-Hill Book Company, 1968. On the other hand, with the coherent laser beam, the cut-off of the resolution for the spatial frequency is also reduced by one half. Consequently, a light source other than the laser light has so far been employed in the optical recording system. However, if the light source employed is of the type in which a spatial modulator is based on the polarized light produced under e.g. the electro-optical effect, it is necessary to provide polarizing plates ahead and at the back of the modulator, which detracts from the efficiency since the system is used in conjunction with a non-polarized light.
Meanwhile, for recording the information without voids, such as by a printer, the conventional practice has been to employ two staggered arrays of modulators. If a light source of a lower light output is employed for affording a homogeneous illumination on these staggered rows of modulators, it has been necessary to provide a plurality of light sources.
It is noted that the following apparatus may be contemplated as a technology of recording the digital voice on the cinefilm.
That is, the device for digital recording of the voice information includes a light source 11, made up of a plurality of light-emitting diodes 10 or halogen lamps, a first polarizing plate 12 for polarizing the light radiated from the light source 11 for re-radiating the light, a light modulator 13 for polarizing the information light in a pre-set manner for re-radiating the light and a converging lens 15 for converging the information light from the second polarizing plate 14 for directing the converged light to a sound track 16a of a cinefilm 16, as shown in FIG. 1.
The light modulator 13 has a first line of apertures or through-holes 17 and a second line of apertures or through-holes 18, each line 17 and 18 having ten apertures or through-holes 17a to 17j and 18a to 18j, respectively. The apertures 17a to 17j of the first aperture line 17 and the apertures 18a to 18j of the second aperture line 18 are positioned so that a land equal to one-aperture width is left between the neighboring apertures. Besides, the apertures 18a to 18j of the second aperture line 18 are disposed directly below the lands between the apertures of the first aperture line 17. That is, the apertures 17a to 17j of the first aperture line 17 are placed in a staggered relation with respect to the apertures 18a to 18j of the first aperture line 18.
With the above-described information recording apparatus, when the recording of the voice information is started, the cinefilm starts to be taken up, at the same time that the light-emitting diodes 10 are illuminated to radiate the light from the light source 11
REFERENCES:
patent: 4085296 (1978-04-01), Keegan
patent: 4603099 (1986-07-01), Drexler
patent: 5155510 (1992-10-01), Beard
patent: 5194996 (1993-03-01), Shores
patent: 5386255 (1995-01-01), Beard et al.
Fukumoto Atsuhi
Kubota Shigeo
Suganuma Hiroshi
Bengtsson W. Patrick
Dinh Tan
Sony Corporation
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