Patent ID: 7390100

Claim:
A variable-shape mirror comprising: a support base; a mirror portion that is disposed to face the support base and that has, on a side thereof facing away from the support base, a mirror surface which is irradiated with a light beam; piezoelectric elements that are sandwiched between and within the support base and the mirror portion so as to make contact with both of the support base and the mirror portion, that vary a shape of the mirror surface, and that are disposed independently from each other; and fixed portions that are sandwiched between and within the support base and the mirror portion so as to make contact with both of the support base and the mirror portion, that fix the mirror portion to the support base, that are provided in a same number as the piezoelectric elements, and that are disposed independently from each other, wherein each of the piezoelectric elements is arranged closer to a center of the mirror portion than each of the fixed portions that are disposed independently from each other is arranged, and said each of the piezoelectric elements makes a pair with a fixed portion that is disposed closest thereto among said fixed portions.