Podcasts by The Inner Workings of CD/DVD Drives

The Inner Workings of CD/DVD Drives

Further podcasts by John C. Bean - WeCanFigureThisOut.org

Podcast on the topic Technologie

All episodes

The Inner Workings of CD/DVD Drives
All of the scenes together from 2023-12-12T18:36:21.358455

Listen
The Inner Workings of CD/DVD Drives
All of the scenes together from 2022-03-07T00:08:41.467416

Listen
The Inner Workings of CD/DVD Drives
All of the scenes together from 2022-03-04T00:04:06.760029

Listen
The Inner Workings of CD/DVD Drives
This podcast is drawn from the Virtual Lab presentations of WeCanFigureThisOut.org. The copyrighted material of this sitewas developed under funding from National Science Foundation CCLI, NIRT, MRSEC and NUE programs. This project is led by John C. Bean from 2022-03-04T00:04:06.758551

Listen
The Inner Workings of CD/DVD Drives
And this all fits inside a half cubic centimeter! from 2022-03-04T00:04:06.756234

Listen
The Inner Workings of CD/DVD Drives
If the disk drifts, one of the side beams blinks on the lane markers. from 2022-03-04T00:04:06.754853

Listen
The Inner Workings of CD/DVD Drives
There is just one more challenge: keeping the laser centered on the data track. from 2022-03-04T00:04:06.753729

Listen
The Inner Workings of CD/DVD Drives
As the disk moves, the astigmatic beam changes shape on the new detector. from 2022-03-04T00:04:06.752157

Listen
The Inner Workings of CD/DVD Drives
But most CD/DVDs use a more complicated scheme. from 2022-03-04T00:04:06.747538

Listen
The Inner Workings of CD/DVD Drives
We could use a circle and ring detector. from 2022-03-04T00:04:06.744546

Listen
The Inner Workings of CD/DVD Drives
Fold the path back up and see what happens at the photodetector. from 2022-03-04T00:04:06.742508

Listen
The Inner Workings of CD/DVD Drives
If the disk moves, the beam no longer emerges parallel. from 2022-03-04T00:04:06.740544

Listen
The Inner Workings of CD/DVD Drives
Trace light rays as they pass through the lens and its clone. from 2022-03-04T00:04:06.737292

Listen
The Inner Workings of CD/DVD Drives
Look more closely at the point where the laser focuses. from 2022-03-04T00:04:06.733843

Listen
The Inner Workings of CD/DVD Drives
Simplfy things by straightening out the beam's path. from 2022-03-04T00:04:06.696599

Listen
The Inner Workings of CD/DVD Drives
But we need to figure out how the lens should move. from 2022-03-04T00:04:06.693600

Listen
The Inner Workings of CD/DVD Drives
So the lens is suspended inside an electromagnet. from 2022-03-04T00:04:06.689805

Listen
The Inner Workings of CD/DVD Drives
But disks are not flat . . . so things get complicated. from 2022-03-04T00:04:06.686381

Listen
The Inner Workings of CD/DVD Drives
The disk's pattern of pits is translated into an optical signal. from 2022-03-04T00:04:06.682309

Listen
The Inner Workings of CD/DVD Drives
This is the path followed by photons of beam. from 2022-03-04T00:04:06.679638

Listen
The Inner Workings of CD/DVD Drives
The laser passes through a splitter and lens, bouncing off the disk to the detector. from 2022-03-04T00:04:06.677859

Listen
The Inner Workings of CD/DVD Drives
Here are its basic components. from 2022-03-04T00:04:06.675916

Listen
The Inner Workings of CD/DVD Drives
The optical head is the heart of the CD/DVD drive. from 2022-03-04T00:04:06.673650

Listen
The Inner Workings of CD/DVD Drives
And then there is the mechanism that moves the optical read/write head . . . from 2022-03-04T00:04:06.672623

Listen
The Inner Workings of CD/DVD Drives
A rail and gear push a cam that lifts the motor, driving its spindle through the disk from 2022-03-04T00:04:06.671610

Listen
The Inner Workings of CD/DVD Drives
Move to the side to see how the rotation motor is lifted from 2022-03-04T00:04:06.670057

Listen