| 摘要 |
<p>A small position detection and positioning device detects relative displacement between two members with high precision. A moving medium-type memory device using such positioning device is also provided. The position detection device includes a linear array (A) of first electrodes (A1,AN,...) at equal pitches on one of the two members (1,2) that have relative displacement in at least one dimension, and a linear array (B) of at least one second electrode (B1) on the other member. The first electrodes are positioned opposite the second electrodes and separated from them by a minute gap. The first electrodes are divided into a first electrode set composed of alternate ones (A1,A3,...) of the first electrodes, and a second electrode set composed of alternate ones (A2,A4,...) of the first electrodes not in the first electrode set. A signal source (3) which applies a first alternating signal to the first electrode set and a second alternating signal that differs in phase by 180 DEG from the first alternating signal to the second electrode set is connected to the first electrodes. A current detecting device (4) that measures the current flowing in the at least one second electrode is connected to the at least one second electrode. <IMAGE></p> |
