|
It is currently 25 Apr 2024, 18:28
|
View unsolved topics | View unanswered posts
|
|
|
|
9954tony
|
Post subject: Re: cld-1010 mythbusters Posted: 04 Mar 2018, 19:20 |
Serious fan |
|
|
Joined: 12 Sep 2015, 05:57 Posts: 210 Location: United States Has thanked: 5 times Been thanked: 54 times
|
primetarget wrote: When the laser goes to read the disc or get a reflection you can actually see the red light turn on inside the lens. What am I missing here ? Are you talking about the CLD-1010 specifically, or all LD players? I personally cannot see with my naked eye, a 780nm IR laser. I can see the 632nm and 650nm red lasers on the HeNe player and DVD player. As I said before though, there is a little red light near the pickup on the CLD-1010, but that is not the laser.
|
|
|
|
|
9954tony
|
Post subject: Re: cld-1010 mythbusters Posted: 04 Mar 2018, 22:50 |
Serious fan |
|
|
Joined: 12 Sep 2015, 05:57 Posts: 210 Location: United States Has thanked: 5 times Been thanked: 54 times
|
rein-o wrote: I just want to add a disclaimer here for all. It really isn't the best thing to look at lasers. thanks rein-o, that is 100% true. You should where special glasses. I should have said that in my posts initially.
|
|
|
|
|
primetarget
|
Post subject: Re: cld-1010 mythbusters Posted: 05 Mar 2018, 02:06 |
Honest fan |
|
|
Joined: 29 Aug 2016, 21:02 Posts: 71 Location: Chicago, IL Has thanked: 1 time Been thanked: 2 times
|
9954tony wrote: primetarget wrote: When the laser goes to read the disc or get a reflection you can actually see the red light turn on inside the lens. What am I missing here ? Are you talking about the CLD-1010 specifically, or all LD players? I personally cannot see with my naked eye, a 780nm IR laser. I can see the 632nm and 650nm red lasers on the HeNe player and DVD player. As I said before though, there is a little red light near the pickup on the CLD-1010, but that is not the laser. To clarify all players. Also to further clarify I am not looking directly into the laser You can see it at a slight angle.
|
|
|
|
|
9954tony
|
Post subject: Re: cld-1010 mythbusters Posted: 05 Mar 2018, 03:04 |
Serious fan |
|
|
Joined: 12 Sep 2015, 05:57 Posts: 210 Location: United States Has thanked: 5 times Been thanked: 54 times
|
primetarget wrote: 9954tony wrote: primetarget wrote: When the laser goes to read the disc or get a reflection you can actually see the red light turn on inside the lens. What am I missing here ? Are you talking about the CLD-1010 specifically, or all LD players? I personally cannot see with my naked eye, a 780nm IR laser. I can see the 632nm and 650nm red lasers on the HeNe player and DVD player. As I said before though, there is a little red light near the pickup on the CLD-1010, but that is not the laser. To clarify all players. Also to further clarify I am not looking directly into the laser You can see it at a slight angle. Okay, i personally can't see that wavelenght (780nm) at a side angle or anything. When referring to the "red" laser of the cld-1010, it is referring to a red-orange wavelength of ~630nm which is very visible, hurts your eyes to look at it from any angle without glasses. the cld-1010 laserdisc archive says this: Quote: The laser uses the Accu-Focus system, and achieves a .55 micron laser spot for 420 lines of resolution. In addition, the LaserRF amp is attached directly to the pickup, for RF-noise rejection. The player also incorporates Video Noise Coring, that eliminates video noise (snow) in dark parts of the picture. This helps tremendously with imperfectly pressed CLV/CAA Extended Play titles. One extra special aspect of the CLD-1010, and what sets it apart from all other Solid State LD players, either before or since, is its Laser Diode uses a RED laser of 6228 Angstroms. No other LD player or CD player with a Diode Laser has used a red laser. http://www.laserdiscarchive.co.uk/laser ... d-1010.htmThat statement on laserdisc archive, contradicts the service manual for the cld-1010, that specifies 780nm for the laser (you can google angstrom to nm to convert, but 780nm is 7800 angstrom, 6228 angstrom is 622nm). Further, the link to the history of lasers I provided earlier clearly indicates that a diode laser of that wavelength (<670) was still in R&D in 1987. That is what I am trying to say, that the information on laserdisc archive, and subsequent references to the same, contradict the manual and other sources about lasers. Using the word "red" is probably too vague or ambiguous, because as rein-o pointed out earlier, they are all "some kind of red".
|
|
|
|
|
jjrclassic88
|
Post subject: Re: cld-1010 mythbusters Posted: 16 May 2022, 14:59 |
Second post |
|
|
Joined: 13 May 2022, 14:50 Posts: 2 Location: United States Has thanked: 0 time Been thanked: 3 times
|
9954tony wrote: "In 1985, Sony researchers reported cracking that barrier by developing AlGaInP diodes emitting cw at room temperature at 671nm in the laboratory. Two years later, Tohru Suzuki of NEC told CLEO 1987 that GaInP diode lasers had operated at 3 to 5 mW at 678nm for more than 4500h at room temperature, doubling the operating time reported earlier in the year, and highlighting his talk with a red diode pointer build from one of the lasers." https://www.spiedigitallibrary.org/jour ... full?SSO=1If a "prototype" red diode laser was being demonstrated by Tohru Suzuki in 1987, there is no way it could have been included in a laserdisc player sold in 1987. I also want to mention that the first short-wavelength solid state RED lasers to be mass-produced was the Toshiba TOLD9200, which became commercially availible in April 1988 with a retail price of $300 each (and are still being manufactured today, now selling for $10 each): https://www.upi.com/Archives/1988/02/08 ... 571294800/https://www.mi-lasers.com/product/3mw-6 ... -told9200/These are red laser diodes that produce a wavelength of 670nm. Toshiba originally developed them in 1985 and tested them in 1986. These types were eventually used for the Muse HD Laserdisc players. https://toshiba-mirai-kagakukan.jp/en/l ... /index.htmAround 1990, solid state red laser technology was further improved to produce shorter wavelengths of 650nm. These types were eventually used for DVD players. With the exception of the Muse HD players in Japan, no LaserDisc player was ever manufactured that ran on a red laser (including the CLD-1010). And all LD/DVD combo players have two separate laser pickups (one infrared 780nm for LD, and one red 650nm for DVD). When the CLD-1010 came out in '87, it wasn't feasible to use red laser because they weren't available. And even when red lasers became available the following year, they were still way too expensive to use in the player that originally went for $2500.
|
|
|
|
|
|
|
|
|
|
|
You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot post attachments in this forum
|
|