| 摘要 |
PURPOSE:To facilitate easy control of the optical axis of a matter to be driven with operation of a fastening screw by separating the matter to be driven and including an objective lens from a drive part including an attachment base and magnets. CONSTITUTION:The magnetic circuit members 17a and 17b consisting of yoke plates 3a and 3b and rectangular parallel piped magnets 4a and 4b magnetized in the thickness direction are fixed on a base 2 made of a die-cast material and having an opening part 1 at the center part by means of setscrews 5a and 5b with the polarities of the same sides set opposite to each other. The magnetic fluxes of the members 17a and 17b are produced toward arrows of magnetic gaps 6a and 6b respectively. Thus the 1st part is formed. Then the 2nd part is set opposite to the 1st part. That is, a support frame 7 and a terminal plate 14 are set opposite to the plate 3a of the member 17a for formation of a square. Then an end of each horizontal part of support springs 8a-8d is stuck to each of four corners of said square with an adhesive. While the other end of each horizontal part of screws 8a-8d is stuck to each of four corners of a mobile frame 9 respectively.
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