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Author Topic: How do car cd players load cd's? Josh Jones Redhat Posts: 1207 From: Plano, TX Registered: Apr 2000 posted 02-19-2003 09:33 PM                        Just how do they do it, without scratching the disk, or getting it dirty? What kind of mechanism is involved? Josh  |  IP: Logged Daryl C. W. O'Shea Film God Posts: 3977 From: Midland Ontario Canada (where Panavision & IMAX lenses come from) Registered: Jun 2002 posted 02-19-2003 09:36 PM                        Rubber rollers grip and 'inject' / eject the disc. The motor spindle attatches to the disc in a way similar to how a 5.25" floppy disc drive clamps to a floppy disc. Which is the same way any tray based CD-ROM drive works (clamping wise).  |  IP: Logged Paul G. Thompson The Weenie Man Posts: 4718 From: Mount Vernon WA USA Registered: Nov 2000 posted 02-19-2003 09:39 PM                     How does car CD players load? Simple...VERY Carefully.... But more importantly, I think pancake syrup, paw prints, disks laying on the floor amongst pop bottles, rocks, sand, dust, etc. will take their toll on a CD and its player very quickly in an automotive enviroment.  |  IP: Logged David Stambaugh Film God Posts: 4021 From: Eugene, Oregon Registered: Jan 2002 posted 02-19-2003 09:43 PM                        Presumably an in-dash 6-disc changer must have some kind of internal "magazine" that keeps the discs physically separated. Mine takes quite a while to load/eject multiple discs and makes lots of whirring and clicking sounds while it does it.  |  IP: Logged Josh Jones Redhat Posts: 1207 From: Plano, TX Registered: Apr 2000 posted 02-19-2003 09:54 PM                        So there are rollers that grab it huh? I thought there was a rubber mat or something like a treadmill that grabbed the disk. Thanks for the info, guys Josh  |  IP: Logged Paul G. Thompson The Weenie Man Posts: 4718 From: Mount Vernon WA USA Registered: Nov 2000 posted 02-19-2003 10:04 PM                     That's where the problem lies. Rubber rollers. Seems they could be very troublesome when they get loaded with crud. If I was to buy one, (which I won't anyway) I would opt for the old style rack and pinion that drags the tray just like a standard CDROM drive. Nothing touches the disk other than the tray itself. Trays are much easier to keep clean than the internal rollers. If the rubber rollers get cruddy enough it might leave imprints and pock marks on the disk, especially if you try to pull it out while the player is trying to suck it in.  |  IP: Logged Josh Jones Redhat Posts: 1207 From: Plano, TX Registered: Apr 2000 posted 02-19-2003 10:11 PM                        FWIW, I dont recall any CD players for automotive applications that had a drawer mechanism. Josh  |  IP: Logged Randy Stankey Film God Posts: 6539 From: Erie, Pennsylvania Registered: Jun 99 posted 02-19-2003 10:14 PM                     There are two long, skinnny, rubber pinch rollers just behind the face place of the player. They are geared together so they counter rotate when the motor activates them. They are concave/curved in shape. The idea is that the curve if the rollers makes it so the only part of the disk is touched by the rollers is the edges. That's why the machine doesn't scratch your disks when it draws them in or spits them out. Then, when the disk is in the proper position the spindles clamp the disk at the center, through the hole. The spindle is shaped so it's self-centering. The little ridge around the hole on the disk helps center the disk. Right before the spindle motor starts spinning the disk, the rubber rollers that pull the disk in part slightly, releasing their hold on the disk. They are no longer needed because the disk is now securely clamped from the center. When the disk is ejected, the process reverses itself.  |  IP: Logged Daryl C. W. O'Shea Film God Posts: 3977 From: Midland Ontario Canada (where Panavision & IMAX lenses come from) Registered: Jun 2002 posted 02-19-2003 10:16 PM                        I once had a 4x Speed Creative CD-ROM drive (with remote control) mounted in my car. I never figured out where I could plug the IDE strap into though. Hey, maybe if I took out my Alpine deck and put the Creative one back in, my car could be THX certified.  |  IP: Logged Josh Jones Redhat Posts: 1207 From: Plano, TX Registered: Apr 2000 posted 02-19-2003 10:49 PM                        Does anyone know of any hardware controllers you can interface with the CDrom drives to make a cheap standalone cd player? Josh  |  IP: Logged Daryl C. W. O'Shea Film God Posts: 3977 From: Midland Ontario Canada (where Panavision & IMAX lenses come from) Registered: Jun 2002 posted 02-19-2003 11:03 PM                        Most older CD-ROM drives have at least a 'next track' button and also automatically start playing an audio CD when it is inserted. So in this case you would only need a power supply. Either a computer PS or a PS that can supply about 1.0A @ 5VDC and 1.2A @ 12VDC will do. Of course functionality would be a little limited.  |  IP: Logged Steve Kraus Film God Posts: 4094 From: Chicago, IL, USA Registered: May 2000 posted 02-19-2003 11:31 PM                    ...but hardly worth doing when no-brand Walkman-esque players can be had so cheaply. Heck you can even get one that plays MP3-CD/R's as well as audio CD's for under $50.  |  IP: Logged John Hawkinson Film God Posts: 2273 From: Cambridge, MA, USA Registered: Feb 2002 posted 02-20-2003 12:21 AM                     Sounds just like a PTR --jhawk  |  IP: Logged William Hooper Phenomenal Film Handler Posts: 1879 From: Mobile, AL USA Registered: Jun 99 posted 02-20-2003 06:15 AM                        You need a Schaefer automation system with a carousel cart changer. -- and a SawzAll to put ANOTHER hole in your head afterwards!  |  IP: Logged Stephen Furley Film God Posts: 3059 From: Coulsdon, Croydon, England Registered: May 2002 posted 02-20-2003 06:31 AM                     Josh wrote: quote: FWIW, I dont recall any CD players for automotive applications that had a drawer mechanism. What do they use then? I've never seen one.  |  IP: Logged

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