| 摘要 |
<p>1,117,419. Facsimile apparatus. NATIONAL CASH REGISTER CO. 9 May, 1967 [11 May, 1966], No. 21481/67. Heading H4F. The Specification describes apparatus for producing a micro-image 18a, Fig. 1, of an original 30, using a laser light source 1 for scanning the original and for producing the micro-image. A beam splitter 3 diverts 10% of the laser energy to scan the original. Lasers 25 and 28 and mirror 26 direct the diverted beam 2b on to a revolving (A, axis C) and rocking (B, axis D) mirror drum 13 to produce a television type scan on the original 30, via lenses 24 and 29. The light reflected by the original is detected by photo-cell 38, and the resulting output thereof is fed to a light modulator 6, either directly for real time reproduction, or via a storage medium. The light modulator may comprise a Pockels cell 6 modulating the plane of polarization of the laser beam 2a and an analyser converting the polarization modulation to amplitude modulation. The amplitude modulated beam is caused to describe a television scan on lens 14 in synchronism with that on original 30 by means of drum 13. A lens 17 then focuses the image of the original on the record member 18. The scanning spot on member 18 is 2 microns in diameter and the image 3 mm. x 3 mm. The member has space for 100 images, controls 40 varying the position of the member. Light source 32 and cells 34 and 35 provide horizontal sync. pulses and cells 36 and 37 provide vertical sync. pulses. The laser beam may be used to read out the image on member 18, the beam passing therethrough falling on cell 42. The image may be projected on screen 23 by means of light source 19 and lens 22. The same beam may be used for original scanning and reproduction, by placing beam splitter 3 &c. just after lens 14, and moving the analyser from the Pockels cell 6 to between said beam splitter 3 and mirror 16 (Fig. 5, not shown).</p> |
