| 摘要 |
PURPOSE:To set a magnetic head under the optimum tracking state, by attaching a magnetic head to the tip part of a circular flexural oscillator formed by bonding two piezoelectric oscillators to a circular metallic plate and then attaching the oscillator to a rotary cylinder. CONSTITUTION:A flexural oscillator is formed by bonding two piezoelectric oscillators 1 polarized in the thickness direction with electrodes attached on each main surface to a metallic plate 2. The tip part of the flexural oscillator has only a metallic plate 3, and the plate 3 has the flexural rigidity that is extremely smaller than other areas. Then the magnetic head 3 is attached to the metallic part at the tip of the flexural oscillator. The flexural oscillator is attached to a rotary cylinder 5 through an attachment part 4. When an electric field is applied to the flexural oscillator, the tip part where the magnetic head is attached has a displacement in response to the scale of the applied electric field. Thus it is possible to obtain the optimum tracking state by the control of the applied electric field. It is possible to have the larger length of a flexural oscillator than that of a rectangular flexural oscillator. Thus a larger displacement is ensured. At the same time, the flexural rigidity is reduced at the tip of the flexural oscillator to obtain a large displacement as well. |
