Optical pickup device

Abstract

Abstract PURPOSE:To obtain a small-sized, inexpensive device by making the point of application of an objective lens driving device nearly coincident with the center of gravity of a movable part including an objective lens. CONSTITUTION:The objective lens driving device 13 has two couples of parallel leaf springs 3 fixed each at one terminal to a movable part fixing member 17 and at the other end to a repeating member 16. Two couples of parallel springs 15 for focusing are fixed to the upper and lower flanks of the repeating member 16 each at one end, and also fixed to the objective lens 1 at the other end. Consequently, the objective lens 1 is allowed to move freely in the directions of optical axes Z and Y, and its movement is restrained in other directions by the parallel springs 3 and 15. The objective lens fixing member 14 is wound with a moving coil 2 for tracking so that a magnetic field 21 is applied in the direction of the axis Y, and also wound with a moving coil 5 for focusing so that a magnetic field 51 is received in the direction of the optical axis Z.

Inventors

• 👤 Hiroshi Okada
• 👤 寛 岡田
• 👤 Masahiro Kume
• 👤 久米　雅弘

Bibliographic Details