Posted by Steve(JazzHunter) on 09/07/05 06:04

On Tue, 6 Sep 2005 21:00:35 -0700, "Alpha" <none@none.net> wrote:

>
>"Steve(JazzHunter)" <jazzhunterNotHere@internet.com> wrote in message
>news:ushsh19dl5inhnspum550ufoec1ptifc3k@4ax.com...
>> On Tue, 6 Sep 2005 18:33:09 -0700, Tarkus <karnevil9@beer.com> wrote:
>>
>>>On 9/6/2005 2:25:39 PM, Alpha wrote:
>>>
>>>> "Tarkus" <karnevil9@beer.com> wrote in message
>>>> news:nefxtqljqjmx$.dlg@tarkus.karnevil9.com...
>>>>> On 9/6/2005 8:44:15 AM, Allan wrote:
>>>>>
>>>>>> Samsung to play safe with dual HD DVD/Blu-ray rig
>>>>>
>>>>> Apparently, they haven't met Alpha, or they'd know that's impossible.
>>>>
>>>> If you read my whole series of notes on this, the caveat was using a
>>>> multi-laser drive system. Sure you can do that...at big cost.
>>>
>>>I believe you also said it would require a completely different drive
>>>mechanism. And didn't you also say there would be licensing issues?
>>
>> No I was the one who said there would be licensing issues, maybe not..
>> However I see no reaosn why a properly-designed pickup couldn't handle
>> both Blu-ray and HD-tv, and it should be quite possible to have two
>> source LEDs for the laser, red and blue.
>
>The article suggests three lasers are required.
>

Yes that's what the article says, Im saying I don't think that would
be necessary. DVDs are more different from CDs in track density and
pit size than the difference between Blu-Ray and HD-DVD, and one laser
is used; and track focus depth just isn't something that requires
different laser assemblies. The wavelength difference between Blue
and Red can be provided with two source lasers using one lens unit.
The requirment of reading both DVDs and HD formats is what would add
to the cost and complexity.

... Steve ..

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