G - Physics – 11 – B
Patent
G - Physics
11
B
352/32.21
G11B 7/18 (2006.01) G01D 15/14 (2006.01) G02B 13/08 (2006.01) G11B 7/085 (2006.01) G11B 7/12 (2006.01) H04N 5/76 (2006.01)
Patent
CA 1070833
ASTIGMATIZER FOR LASER RECORDING AND REPRODUCING SYSTEM ABSTRACT OF THE DISCLOSURE In a laser recording system, a high energy intensity laser beam is focused to form a circular write-spot on a rotating thermoplastic disc. This spot creates tracks of grooves and flat areas or lands in accordance with input data. To read the data from the disc a reduced energy beam is focused on the previously recorded track, and the pat- tern of grooves and lands is determined from the reflected energy. The optics associated with the reading process include an astigmatizer which elongates the read-spot in a direction transverse to the track. This reduces mech- anical tolerances required to insure that the read-spot will impinge upon the desired track. The astigmatizer may also serve to reduce the beam spot energy intensity so that the same laser, without the astigmatizer, can be used for the recording process. In one embodiment, the astigmatizer is a movable plate having a single slit. For reading, the astigmatizer is positioned in the beam path and the slit creates an orthogonal diffraction pattern which provides the elongated read-spot of reduced energy intensity. -1-
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