Lock mechanism, and electronic device equipped with lock mechanism

A lock mechanism capable of locking, in an electronic device configured to include a first unit and a second unit so that the first unit and the second unit are detachable, the first unit and the second unit coupled each other,

• the lock mechanism comprising:
• an engaging member provided to the second unit, the engaging member projecting externally from a predetermined face of the second unit, the engaging member being turnable about a rotation shaft center perpendicular to the predetermined face;
• an operating member provided to the second unit, the operating member being linearly movable between a first position and a second position;
• an engaging-target portion provided on a first side of the first unit, the engaging-target portion being formed to, when the first unit and the second unit are coupled each other, engage with the engaging member when the engaging member lies at a first rotational position, and disengage from the engaging member when the engaging member lies at a second rotational position;
• and
• a drive mechanism that translates a linear movement of the operating member between the first position and the second position into a rotation of the engaging member between the first rotational position and the second rotational position so that, when the operating member is moved to the first position, the engaging member is rotated to the first rotational position, and, when the operating member is moved to the second position, the engaging member is rotated to the second rotational position,
• wherein
• the engaging member includes a pair of engaging pieces around the rotation shaft center, and
• the engaging-target portion includes a pair of engaging recesses with which the pair of engaging pieces engages when the engaging member lies at the first rotational position, and from which the pair of engaging pieces disengages when the engaging member lies at the second rotational position.