| 摘要 |
PROBLEM TO BE SOLVED: To secure the parfocality of an image position by a relay lens system even when a microscopic head part is exchanged. SOLUTION: An image forming lens 31 for forming an image obtained by an infinity objective lens 21 is provided in a holding body 23 provided at the edge part of a relay lens barrel 10, that is, not inside the magnetic head part 20 but on an extended relay lens barrel side in which the relay lens optical system is assembled.
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