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* Geoffrey Goode <[EMAIL PROTECTED]> on Tue, 12 Oct 1999
| But not for reading CDs'. For broadcast work you preferably go for
| three laser readers as if they are slightly askew, low reflectivity,
| etc. they will still read, whereas single lasers have to be spot on, and
| with a very good reflection from the CD. I don't think that there are
| any broadcast quality players that have single lasers these days. I
| thought that all, but the very cheapest, CD players had three lasers
| these days.
This is something of a myth. You see, Sony's mechanism uses only one read
laser. The other two lasers are used for tracking. The logic is, if
either of the two tracking lasers say that the read laser is not aligned
correctly, the entire lens assembly should be realigned. The Philips
mechanism uses one laser. The logic is, if the read laser is not aligned
correctly, the lens assembly should be realigned. If any of the three
lasers in the Sony mechanism become incorrectly focused, the whole thing
fails. The Philips mechanism cannot not suffer from this type of failure.
A bonus side effect, the Philips mechanism is more resistant to skipping
than Sony's.
And contrary to your belief, it is the cheapest CD players that have three
lasers, because Sony licenses its mechanism for significantly less than
Philips.
[...]
| Where was it overheating? From the spinning of the CD, the motor, or
| the electronics?
The over-charged write laser.
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