***Official Blu-Ray Discussion Thread***

Discussion in 'Playback Devices' started by Robert Woods, Mar 13, 2002.

  1. Robert Woods

    Robert Woods Stunt Coordinator

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    I certainly can understand the Blue Laser development is also a software issue but I do wonder why 'Blue Laser' hardware related matters are not handled in a thread(s) on this forum?
    There are a lot of things to be brought up that would not seem to be software related except of course hardware without software is irrelevant.
    One area that certainly is a question mark (among a myriad of others) is how will this 'coming' affect the whole area of DVD recording - formats, commercial availability, etc.
    It may well be that recording will only happen with 'red' technology - but it also may well be that few will invest the big bucks in recording DVD units that do not at least have the blue 'playing' feature - etc etc
    Anyhow I hope that the administrators will allow some discussion to build up 'over here' - rather than directing everyone over to the Simpsons [​IMG]
     
  2. Michael Reuben

    Michael Reuben Studio Mogul

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    For a week or so after the press release about blue laser technology, new threads were popping up daily. They had to be consolidated somewhere, and Software was chosen because the discussions started there first.
    Now that the initial furor has died down, I see no reason why we can't try a separate thread for hardware-specific discussion. So:
    This thread is designated the Official Blu-Ray Discussion Thread. Thanks for your cooperation.
    Michael Reuben
    HTF Administration[/b]
     
  3. Aaron E. Smith

    Aaron E. Smith Stunt Coordinator

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    About Blue Laser: I personally think that it will fall by the wayside for a few years or more. There are less costly alternatives, such as flourescent discs. Check out a little company called Constellation 3D (yes, I am an investor, but I'm not trying to push their stock, I just like their tech. quite a bit). It remains to be seen if an FMD will be the successor to the standard DVD, but I think it has a better shot than Blue Laser because FMD uses Red Laser to attain a significant leap in data storage capacity.
     
  4. Scott L

    Scott L Producer

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    But if FMD uses red laser is the data-pipe still constrained to 9.6mb/sec as opposed to 36mb/sec with blue laser?
     
  5. Martin Fontaine

    Martin Fontaine Supporting Actor

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  6. Robert Woods

    Robert Woods Stunt Coordinator

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    Anyone aware of new developments/rumors in this area?
     
  7. JeffreyMercado

    JeffreyMercado Second Unit

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    From the vibe I was getting from the HTS show in New York it seems next year we will hear some announcements. The zenith rep. said they have the technology, and that it would not take long to put one out. Beauracracy is whats holding this technology down. I am sure once everybody sees how well the dvhs will do they will jump to make the big bucks.
     
  8. Thik Nongyow

    Thik Nongyow Stunt Coordinator

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    A dumb question, or is it?

    With the recent advocacy over blue laser for HD-DVD, why the laser had to be blue? Is it because the properties of this color can do wonders over red?
     
  9. Jeff Kleist

    Jeff Kleist Executive Producer

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    It has to do with the wavelength of blue light vs red. Blue can be tuned a lot finer than red can, so it can be more exact
     
  10. Brenton

    Brenton Screenwriter

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    Blue light has a higher frequency (smaller wavelengths) than red light, so the data can be written much smaller when a blue laser is to read it.

    Think of it like the data is Braille, and blue has little fingers while red has big fingers. Red can't read the Braille because his fingers are too big and clumsy, while blue can read it just fine.

    Speaking of which, wouldn't purple be the absolute best laser? Why don't they go with purple instead of blue?
     
  11. DanielSmi

    DanielSmi Second Unit

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    isn't purple a combination of blue and red, so wouldn't it be right in the middle?

    Daniel Smith
     
  12. John Royster

    John Royster Screenwriter

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    ROYGBIV, violet having the shortest wavelength. Ultraviolet is next and so on up the range.

    Might have to do with materials and current laser technology why blue was chosen over indigo or violet. Don't know the exact frequency they're using though.

    snipet of EM range

    Type Wavelength Range

    Radio wavelength > 10-4 m = 0.1 mm

    Infrared 700 nm < wavelength < 0.1 mm

    Visible 400 nm < wavelength < 700 nm

    Ultraviolet 20 nm < wavelength < 400 nm

    X-rays 0.1 nm < wavelength < 20 nm

    Gamma rays wavelength < 0.1 nm

    visible is from 400 to 700 nanometers. pretty big swing in terms of wavelength.
     
  13. Yee-Ming

    Yee-Ming Producer

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  14. Jagan Seshadri

    Jagan Seshadri Supporting Actor

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    To Daniel Smith,

     
  15. John Kotches

    John Kotches Cinematographer

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    Well, there's two items at work here......

    Absorptive coloration, vs. emittive coloration.

    A painting is an absorptive coloration -- when something is red on a painting, it is red because it absorbs all other colors.

    When you add blue to red, you get a combination absorptive effect which makes us see purple.

    When dealing with emittive coloration, ie from a light source, then purple is merely "bluer than blue" so to speak.

    Interestingly enough it was either Panasonic, Toshiba or Samsung which demonstrated a "frequency doubling" technique for semiconductor (diode) lasers. This would allow for relatively cheap blue lasers.

    Regards,
     
  16. Clinton McClure

    Clinton McClure Casual Enthusiast
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    I think I remember reading something about this, although I do not remember which company did it.
     
  17. Seth Paxton

    Seth Paxton Lead Actor

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    Yes, the problem with just picking any color laser you need is the actual production of the laser light.
    Semiconductor red diode lasers are cheap as hell, thus all the technology based off them.
    The whole hold-up on blue is the "cheap" creation of the blue laser, cheap enough for consumer electronics.
    Some semiconducting materials give off different types of light, just as various gasses also have their own "fingerprint" of light that can be emitted by ramming electrons through them (think neon lights). Different gasses in a tube like that can give different colors, but not all gasses are equally safe, nor equally cheap.
    Regarding X-Ray reading and electron microscopes as well. At least in the case of electron scopes, the process of reading is also actually destructive of the material. Not good for repeat playback devices. [​IMG] When the wavelengths get to be the size of the molecules involved you can start knocking them loose by blasting them with that wavelength of EM.
    Also, you'd have to consider interference from other EM wave sources, both affecting you and you affecting them. Maybe even within the same chassis depending on what EM wavelength you used.
    Also, a general explanation of the light coming from diodes and gasses has to do with their electron orbits. Bumping electrons up an orbit (in terms of energy level) will result in that same energy being emmitted (sometimes as light) when the electron falls back to it's natural orbit. Running electrons through the material bumps the orbiting electrons up (by adding energy). The physical structure of the electron orbits basically determines what light/energy is emmitted. Atomic electron orbits are discrete, or QUANTUM, in nature. They only change by exact steps. Like going from 1 to 5 without ever going to 2,3,4. The energy level is either A or B. So they emit energy of an amount B-A only. Since A and B differ for different atoms, you get different output (and most is not visible light).
    It's a bit sloppy as an explanation, but good enough as a rough start. I'm just EE not a physics grad. [​IMG]
    (this is not to be confused with the effect off scattering/absorbing light that hits the molecule, which is what makes our sky blue for example)
     
  18. Lee Petty

    Lee Petty Stunt Coordinator

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    dread the day i need to wear a lead vest to watch a dvd.....
     
  19. Yee-Ming

    Yee-Ming Producer

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    whew! nice explanation Seth, brings back memories of A-level chemistry, which I aced but have absolutely no recollection of anymore...

     
  20. felix_suwarno

    felix_suwarno Screenwriter

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    when are they going to mass produce dvd players with blue laser?
     

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