Optical pick-up

Abstract

Abstract PURPOSE:To prevent the generation of the dislocation of tracking by providing a converging means and a hologram element while a constant relative position is held. CONSTITUTION:A converging means 13 and a hologram element 12 are provided while a constant relative position is held. At the time of a tracking action, the converging means 13 and the hologram element 12 are simultaneously moved to this. Consequently, the relative misregistration of the reflecting light beam made incident on through the converging means hardly occurs. Thus, a satisfactory servo signal recording information signal can be obtained. For example, even when the converging means is moved so as to follow a converging spot, the dislocation of the relative position of the converging means and the hologram does not occur.

Inventors

• 👤 Yoshio Yoshida
• 👤 Toshiya Nagahama
• 👤 Katsuhiro Kubo
• 👤 Yukio Kurata

Bibliographic Details