To provide an optical head in which thermal stress caused by an optical lens attached to a bobbin can be reduced.
The optical head 110 is equipped with the bobbin 10 which is formed with a center hole 10H, and the optical lens 20 which is attached to the bobbin 10 through a thermal expansion relaxing member 40 formed with an opening 40H. The optical lens 20 is provided with a base plate 24A consisting of an optical material whose thermal expansion coefficient is different from that of the bobbin 10. The base plate 24A is provided with a projected part 21 having the function of a convex lens and with a flat part 22 situated on the periphery of the projected part 21. The flat part 22 is stuck to the thermal expansion relaxing member 40 in a manner that the projected part 21 is fitted to the opening 40H. The optical lens 20 is arranged so that the center axis or its extension of the projected part 21 passes through the center hole 10H of the bobbin 10, while the center axis of the projected part 21 is aligned with that of the center hole 10H of the bobbin 10.
KOCHIYAMA AKIRA
YAMAMOTO KENJI
HASHIMOTO GAKUJI
IIDA ATSUSHI
