Patent ID: 8045433

Claim:
A pickup apparatus comprising: at least a coil constituting an actuator, a signal to be sent to the coil being obtained by calculation using an algorithm on the basis of at least one of a focus error signal and a tracking error signal, wherein the signal to be sent to the coil is obtained by calculation on the basis of the following formula (A), [ FO ⁢ ⁢ 1 FO ⁢ ⁢ 2 TR ] = [ A ⁢ ⁢ 11 A ⁢ ⁢ 12 A ⁢ ⁢ 13 A ⁢ ⁢ 14 A ⁢ ⁢ 21 A ⁢ ⁢ 22 A ⁢ ⁢ 23 A ⁢ ⁢ 24 A ⁢ ⁢ 31 A ⁢ ⁢ 32 A ⁢ ⁢ 33 A ⁢ ⁢ 34 ] ⁡ [ FE TILT TE TE 2 ] ( A ) where FO 1 represents a driving signal to be input into a first focus/tilt coil; FO 2 represents a driving signal to be input into a second focus/tilt coil; TR represents a driving signal to be input into a tracking coil; A 11 , A 12 , A 13 , A 14 , A 21 , A 22 , A 23 , A 24 , A 31 , A 32 , A 33 , and A 34 represent coefficients having arbitrary values; FE represents a focus error signal; TE represents a tracking error signal; and TILT represents a correction tilt amount signal.