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# CD compatibility is assured

Toshiba had to solve a difficult problem: the same laser had to be able to read signals from two discs with different pit widths. Several possible solutions were considered.

Among the candidate solutions are an integrated two-lens switching system which consists of two lenses, one for CD, and the other for DVD, and a dual-focus pickup system in which a single lens is used to achieve focus for both CD and DVD.

With the integrated two-lens switching system, two lenses, one for CD and the other for DVD, are switched by rotating the lenses horizontally to read signals for each disc.

With the dual-focus pickup system, thanks to the adoption of a hologram lens, a single lens can achieve focus for both CD and DVD without being realigned, and read the signals.


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