| 摘要 |
<p>This disclosure depicts a feed device for a magnetic head (16) applicable to an electronic still camera or a reproducer in an electronic camera system wherein a subject is pure-electronically still-photographed and recorded in a rotating magnetic disc (101), and the reproducing of an image is carried out by a television system or a printer.</p><p>The feed device for a magnetic head (16) utilizes a planetary gear reduction mechanism (22;22A,22B;24,26,28, 30,32,34,36,38;56) to obtain a high reduction ratio, whereby a head carriage (14) carrying the magnetic head (16) is finely fed. The planetary gear reduction mechanism comprises: a sun gear (22;22A,22B) connected to a rotary driving source (12); a stationary internal gear wheel (24) disposed concentrically with the sun gear (22;22A,22B) therearound; a rotary internal gear wheel (28) for the output disposed concentrically with the stationary internal gear wheel (24); at least one first planetary gear (26) being in mesh with the stationary internal gear wheel (24) as well as the sun gear (22;22A,22B); at least one second planetary gear (32) being in mesh with the rotary internal gear wheel (28) as well as the sun gear (22;22A,22B); and an arm member (34) for rotatably supporting said first and second planetary gears (26,32) so that the planetary gears can revolve respectively around the sun gear (22;22A,22B). The rotary internal gear wheel (28) for the output is connected to the head carriage (14) carrying the magnetic head (16) through the rotationlinear movement converting mechanism (40,42,44,46,48) and performs the fine feed of the magnetic head (16), e.g. by 100 µm with high accuracy.</p> |
