| 摘要 |
PROBLEM TO BE SOLVED: To simply compose a rotation adjustment mechanism comprising a lower base, an upper base, and a holder member of the minimum number of parts necessary, provide an automatically aligning function, securely transmit impact load from the holder member to the lower base, reduce deformation, and reduce plate thickness to achieve light weight. SOLUTION: An engagement slide part 21 having a roughly inverted U-shaped cross section is formed on the lower base 11. The upper base 13 is disposed through the engagement slide part 21 of the lower base 11 and a first rolling member 23. A slide part 25 having a roughly inverted U-shaped cross section to be engaged with the engagement slide part 21 is formed on the holder member 15. A second rolling member 27 is provided between the slide part 25 of the holder member 15 and the engagement slide part 21 of the lower base 11. A roughly S-shaped bearing part 34 is formed in such a way that a line connecting the centers of the first rolling member 23 and the second rolling member 27 to each other is inclined.
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