An optical deflector apparatus comprising: a mirror; an inner frame surrounding said mirror; a first outer frame surrounding said inner frame; an inner piezoelectric actuator (4a; 4b, 4b') coupled between said mirror and said inner frame and adapted to flex said mirror around a first axis of said mirror; a first outer piezoelectric actuator (6a-1, 6a-2, 6b-1, 6b-2; 7a, 7b, 7b') coupled between said inner frame and said first outer frame and adapted to flex said mirror around said first axis of said mirror; a driver adapted to generate an offset drive voltage (V OFFSET1, V OFFSET2) and a first rocking drive voltage (V X1, V X2; V X1 ', V X2 '), said offset drive voltage (V OFFSET1, V OFFSET2) being applied to a first piezoelectric actuator selected from said inner piezoelectric actuator (4a; 4b, 4b') and said outer piezoelectric actuator (6a-1, 6a-2, 6b-1, 6b-2; 7a, 7b, 7b'), said first rocking drive voltage (V X1, V X2; V X1 ', V X2 ') being applied to a second piezoelectric actuator different from said first piezoelectric actuator, selected from said inner piezoelectric actuator (4a; 4b, 4b') and said first outer piezoelectric actuator (6a-1, 6a-2, 6b-1, 6b-2; 7a, 7b, 7b'), wherein said first piezoelectric actuator comprises a first group of piezoelectric cantilevers (4a-1, 4a-1s, 4a-3s, 4b-1, 4b-1s, 4b-3, 4b-3s) and a second group of piezoelectric cantilevers (4a-2, 4b-2) alternating with said first group of piezoelectric cantilevers (4a-1, 4a-1s, 4a-3s, 4b-1, 4b-1s, 4b-3, 4b-3s) folded at their ends and in parallel with a second axis of said mirror, wherein said offset drive voltage (V OFFSET1) is applied to said first group of piezoelectric cantilevers (4a-1, 4a-1s, 4a-3s, 4b-1, 4b-1s, 4b-3, 4b-3s) and an inverted voltage (V OFFSET2) of said offset drive voltage (V OFFSET1) is applied to said second group of piezoelectric cantilevers (4a-2, 4b-2), and wherein said offset drive voltage (V OFFSET1) is rectangular-wave shaped in an active period (T A) and is pulse-shaped in a blanking period (T B). a mirror; an inner frame surrounding said mirror; a first outer frame surrounding said inner frame; an inner piezoelectric actuator (4a; 4b, 4b') coupled between said mirror and said inner frame and adapted to flex said mirror around a first axis of said mirror; a first outer piezoelectric actuator (6a-1, 6a-2, 6b-1, 6b-2; 7a, 7b, 7b') coupled between said inner frame and said first outer frame and adapted to flex said mirror around said first axis of said mirror; a driver adapted to generate an offset drive voltage (V OFFSET1, V OFFSET2) and a first rocking drive voltage (V X1, V X2; V X1 ', V X2 '), said offset drive voltage (V OFFSET1, V OFFSET2) being applied to a first piezoelectric actuator selected from said inner piezoelectric actuator (4a; 4b, 4b') and said outer piezoelectric actuator (6a-1, 6a-2, 6b-1, 6b-2; 7a, 7b, 7b'), said first rocking drive voltage (V X1, V X2; V X1 ', V X2 ') being applied to a second piezoelectric actuator different from said first piezoelectric actuator, selected from said inner piezoelectric actuator (4a; 4b, 4b') and said first outer piezoelectric actuator (6a-1, 6a-2, 6b-1, 6b-2; 7a, 7b, 7b'), wherein said first piezoelectric actuator comprises a first group of piezoelectric cantilevers (4a-1, 4a-1s, 4a-3s, 4b-1, 4b-1s, 4b-3, 4b-3s) and a second group of piezoelectric cantilevers (4a-2, 4b-2) alternating with said first group of piezoelectric cantilevers (4a-1, 4a-1s, 4a-3s, 4b-1, 4b-1s, 4b-3, 4b-3s) folded at their ends and in parallel with a second axis of said mirror, wherein said offset drive voltage (V OFFSET1) is applied to said first group of piezoelectric cantilevers (4a-1, 4a-1s, 4a-3s, 4b-1, 4b-1s, 4b-3, 4b-3s) and an inverted voltage (V OFFSET2) of said offset drive voltage (V OFFSET1) is applied to said second group of piezoelectric cantilevers (4a-2, 4b-2), and wherein said offset drive voltage (V OFFSET1) is rectangular-wave shaped in an active period (T A) and is pulse-shaped in a blanking period (T B).