| 摘要 |
A lock mechanism includes an opening and closing member ( 10 ) that is openably and closably provided on an apparatus frame ( 1 a), a shaft member ( 15 ) that is provided on the apparatus frame ( 1 a) for rotatably supporting the opening and closing member ( 10 ), and three lock member sets ( 13 ) and ( 14 ) for sustaining a state in which the opening and closing member ( 10 ) is closed with respect to the apparatus frame ( 1 a). The lock member sets ( 13 ) and ( 14 ) include secured members ( 13 ) provided on the opening and closing member ( 10 ), and bearing members ( 14 ) that are provided on the apparatus frame ( 1 a) for elastically securing the secured members ( 13 ). The elastic force when a secured member ( 132 ) in one specific lock member set is secured to a bearing member ( 142 ) is set to be greater than that of the other lock member sets ( 131 ), ( 133 ), ( 141 ), and ( 143 ).
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