| 摘要 |
A monitor hinge device includes engagement projections 42, and engaging holes 43a, 43b, 44a, and 44b for enabling a monitor 3 to be opened and closed about a first rotation central axis X and for enabling the above-mentioned monitor 3 which has been rotated about the above-mentioned first rotation central axis X in an opening direction to be rotated about a second rotation central axis Y perpendicular to the above-mentioned first rotation central axis X, and for positioning the above-mentioned monitor 3 at a position at which the above-mentioned monitor 3 is rotated by a predetermined amount with respect to the above-mentioned first rotation central axis X and for positioning the above-mentioned monitor 3 which has been rotated about the above-mentioned second rotation central axis Y at a position at which the above-mentioned monitor 3 is rotated by a predetermined amount with respect to the above-mentioned first rotation central axis X.
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