Patent ID: 7298987

Claim:
A device which is a first device for fitting a second device thereto, the device, comprising: an attaching section to which the second device is fitted; and a removable cover that can be entirely detached from a main unit of the first device, when the second device is not fitted to the main unit of the first device, the removable cover serving a first function as a cover for the attaching section, wherein one of the first device and the second device is provided with object determination means which determines whether or not there exists any object at a predetermined position, prior to fitting the second device to the main unit of the first device, the removable cover is entirely detached from the attaching section, while the second device is fitted to the main unit of the first device, the removable cover exists at the position determined by the object determination means, and is attached to a device which is not provided with the object determination means of the first device and the second device, and when the second device is fitted to the main unit of the first device, the removable cover serving a second function which is different from the first function, such that the removable cover is entirely detached from the first device at a location at which the removable cover serves as a cover for the attaching section and then reattached to one of either the first device and the second device in a state different from a state when the second device is not fitted to the main unit of the first device.