Patent ID: 8203799

Claim:
A lens component which is a cemented lens comprising: a lens LA; and a lens LB, wherein an absolute value of a refracting power of the lens LB is smaller than an absolute value of a refracting power of the lens LA, and the lens component satisfies the following conditional expressions (1) and (3) 0.01≦1/ν2−1/ν1≦0.06 (1) 0.5×ν2/ν1< Tν 2 /Tν 1<10×ν2/ν1 (3) where, ν1 denotes Abbe's number (nd1−1)/(nF1−nC1) of the lens LA, ν2 denotes Abbe's number (nd2−1)/(nF2−nC2) of the lens LB, nd1, nC1, nF1, and ng1 denote refractive indices of the lens LA for a d-line, a C-line, an F-line, and a g-line respectively, nd2, nC2, nF2, and ng2 denote refractive indices of the lens LB for the d-line, the c-line, the F-line, and the g-line respectively, Tν1 denotes a reciprocal of a temperature dispersion of the lens LA, Tν2 is a reciprocal of a temperature dispersion of the lens LB, and a reciprocal Tνd of the temperature dispersion is expressed by the following expression Tνd =( nd 20−1)/( nd 00 −nd 40) where, nd00 is a refractive index of the d-line of a lens medium at 0° C., nd20 is a refractive index of the d-line of the lens medium at 20° C., and nd40 is a refractive index of the d-line of the lens medium at 40° C.