Voice coil type linear motor

Abstract

Abstract PURPOSE:To mount an image sensing element on the side of a coil bobbin, and to attain stable drive by installing a pair of permanent magnets holding a core and a guide shaft for sliding the coil bobbin and fixing a base plate, on which the image sensing element, etc., are loaded, to the coil bobbin. CONSTITUTION:When predetermined currents are caused to flow through a coil 50 for a linear motor 5, a bobbin 51 is guided by a guide shaft 54 and moved to the right or the left between the opposed sections of a pair of permanent magnets 57, and a base plate 52 is shifted together with the bobbin 51. An image sensing drive has the linear motor 5, a linear encoder 6, a drive circuit 7 and an image sensing element 4 fitted to an arm 59 backward projected from the base plate 52. The linear encoder 6 consists of a scale 61 and a position-signal generating section 62 set up in front of the base plate 52, and a signal corresponding to the travel of the base plate 52 is outputted from the signal generating section 62. When the output signal is fed back to the drive circuit 7, the linear motor 5 driven by closed-loop control is transferred at uniform velocity, and the image sensing element 4 can be moved at a uniform rate.

Inventors

• 👤 Keiji Ikeda
• 👤 池田　恵司
• 👤 Yoshiaki Kamiya
• 👤 佳明 神谷

Bibliographic Details