Patent ID: 8020901

Claim:
An operation panel assembly comprising: a housing for accommodating at least one display device; a first member including an aperture to accommodate an operation panel of the assembly; a second member configured to be engaged with said first member; a holder mounted between the first and second members and configured to secure the operation panel to the first and second members within the aperture; a first assembly mechanism including: a first locking means for locking said first member to said second member, and for unlocking in accordance with pressure provided from external of said housing, the first locking means including a first claw on the first member engaging with a second claw on the second member; a notch formed in the first member to receive a user's finger to provide the pressure from external of said housing to unlock the first locking means by pushing against the first claw of the first member; and a second locking means for locking said first member to said second member, which is located in a different portion from said first locking means, and for unlocking by rotating either of said first member or said second member at said second locking means, the second locking means includes a third claw on the second member engaging with a frame portion on the first member that receives the third claw; and a second assembly mechanism including screws extending into both the first and second members to assemble the first and second members to each other more securely than by the first assembly mechanism.