2007-08-01 21:55:40 · 3 answers · asked by Anonymous in Consumer Electronics ➔ Home Theater
The disc (CD or DVD) is coated with a reflective material. The writing process makes certain parts of the material non-reflective (permanently for normal CDs and DVDs, and temporarily for rewritable discs). Then, the laser (really a laser diode) focuses a beam of light onto the surface of the disc. The reflected light is detected by a photodiode -- a device that modulates the current it allows to pass based on the amount of light incident on it. So the digital information on the disc causes the photodiode to modulate its output current, and it is this signal that the CD or DVD player converts to music.
As far as lasers in other entertainment things: I'm not aware of any other entertainment devices that use such lasers. There are lots of industrial uses for them (bar code scanners being the most common).
2007-08-02 01:43:09 · answer #1 · answered by dansinger61 6 · 1⤊ 0⤋
The lasers read the data on discs which send the information back into computer of any system whether it be a full-sized personal computer or a DVD player. The laser reads it so the other hardware can write it.
2007-08-01 22:00:35 · answer #2 · answered by Amo 4 · 0⤊ 0⤋
the french composer jean michel jarre uses laser technology in his concerts all the time. for projecting images both on buildings and in the air. it is fascinating-you should look at it sometime. some of the projections are hundreds of feet high.
2007-08-04 10:03:57 · answer #3 · answered by tony c 5 · 0⤊ 0⤋