Pros and Cons of Spindle and CD moving on a motor-driven Sled (Sony CDP-XA Series)

[tiefbassuebertr]

Typically, a CD is spun in place, while a laser assembly tracks the recording (mounting on a moving sled).
Inside of several models of Sony's CDP-XA series the laser pickup is fixed (unusual) and the spindle and rotating CD move on a motor-driven sled.

You can see this mechanism in operation the first time you open the CD-loading tray: The latter moves outward at a different rate than the spindle itself - go to
http://blog-imgs-58.fc2.com/s/a/n/sanchopanza/20130509001.jpg
http://ns.tachyon.co.jp/~sichoya/main/corner2/lcxo01/11.jpg

Are there special benefits in opposite of mostly to find sled with moving optical pickup and fixed turntable motor ?

Thank you for your advices.

 

[Salar]

Are there special benefits in opposite of mostly to find sled with moving optical pickup and fixed turntable motor ?

Almost None:

Moving Disc: More mass to move - not good when disc is not centered.
The only advantage of moving disc: Short signal path to the fixed laser.
But when the laser has a RF-Amp on board there is no advantage at all.

Sonys very, very first CD-Player (not the CDP-101), the CDP-5000, made for broadcasting in 1982 had a fixed laser. I assume the simple reason was that it was easier to feed a moving motor with 4 wires than to move -at this time- a very big laser which is also fed with a "Drahtverhau" (german slang for many wires) of wires for power, diodes, coils etc...
Bought a CDP-X5000 in 1997 nevertheless. The moving disc mechanism was simply more rugged than ordinary mechs...

 

[tiefbassuebertr]

Almost None:

Moving Disc: More mass to move - not good when disc is not centered.
The only advantage of moving disc: Short signal path to the fixed laser.
But when the laser has a RF-Amp on board there is no advantage at all.

Sonys very, very first CD-Player (not the CDP-101), the CDP-5000, made for broadcasting in 1982 had a fixed laser. I assume the simple reason was that it was easier to feed a moving motor with 4 wires than to move -at this time- a very big laser which is also fed with a "Drahtverhau" (german slang for many wires) of wires for power, diodes, coils etc...
Bought a CDP-X5000 in 1997 nevertheless. The moving disc mechanism was simply more rugged than ordinary mechs...

This model from the URL under
CDP-5000S SONY - HiFi-Do McIntosh/JBL/audio-technica/Jeff Rowland/Accuphase
非卖品SONY-CDP5000顶级电台专用CD台 -
Sony CDP-5000 first consumer hf cd player | eBay
and the images ?

 

[Scytales]

Some very cool inner views of the pro audio CD player Sony CDP-S3000 with close-up shots on the fixed pick-up mechanism at the bottom of the page on the French site Vintage Audio Laser : https://vintage-audio-laser.com/Sony-CDP-3000-CDS-3000