Battery loading and unloading mechanism

Abstract

Erroneous insertion of a battery into an imaging device is prevented. In a battery loading and unloading mechanism, a battery 2 is formed with projecting portions at longitudinal both ends of a back surface and along the back surface, the back surface being a surface opposite to an insertion surface of the battery, whereby even the battery formed in a flat rectangular parallelepiped and having the almost-square main surface can be prevented from being erroneously inserted into the device. The projecting portion has an inclined surface acutely inclined with respect to the back surface, and when the battery is unloaded from the device, unloading of the battery from the device is accelerated by the inclined surface undergoing contact pressure of the retaining means.

What is claimed is: 
     
         1 . A battery comprising:
 a first surface;   a first projecting portion configured to project along an insertion direction from the first face of the battery;   a first side projecting portion projecting, in an direction perpendicular to a first side of the battery, from the first side, the first side being substantially perpendicular to the first face.   
     
     
         2 . The battery according to  claim 1 , further comprising a second projecting portion configured to project along the insertion direction from the first surface of the battery. 
     
     
         3 . The battery according to  claim 2 , wherein the second projecting portion has a different shape from the first projecting portion. 
     
     
         4 . The battery according to  claim 1 , further comprising a second side projecting portion configured to project, along a direction perpendicular to a second side of the battery, from the second side, the second side being opposite to the first side. 
     
     
         5 . The battery according to  claim 4 , wherein the second side projecting portion has a different shape from the first side projecting portion. 
     
     
         6 . The battery according to  claim 4 , further comprising a frame portion disposed at a second face, the second face being opposite to the first face. 
     
     
         7 . The battery according to  claim 6 , wherein the first side projecting portion and the second side projecting portion are located on the frame portion. 
     
     
         8 . The battery according to  claim 7 , wherein the first side projecting portion and the second side projecting portion are located within a thickness of the frame portion. 
     
     
         9 . The battery according to  claim 7 , wherein the first side projecting portion and the second side projecting portion are located at both longitudinal ends of the frame portion. 
     
     
         10 . The battery according to  claim 6 , further comprising a first side surface at the first side of the battery and a second side surface at the second side of the battery. 
     
     
         11 . The battery according to  claim 1 , further comprising a frame portion disposed at a second face, the second face being opposite to the first face. 
     
     
         12 . The battery according to  claim 11 , wherein the first side projecting portion is disposed on the frame portion. 
     
     
         13 . The battery according to  claim 1 , further comprising terminals disposed on the first face. 
     
     
         14 . The battery according to  claim 12 , further comprising a second projecting portion configured to project along the insertion direction from the first surface of the battery. 
     
     
         15 . The battery according to  claim 14 , wherein the second projecting portion has a different shape from the first projecting portion. 
     
     
         16 . The battery according to  claim 12 , further comprising a second side projecting portion configured to project, along a direction perpendicular to a second side of the battery, from the second side, the second side being opposite to the first side. 
     
     
         17 . The battery according to  claim 16 , wherein the second side projecting portion has a different shape from the first side projecting portion. 
     
     
         18 . The battery according to  claim 16 , further comprising a frame portion disposed at a second face, the second face being opposite to the first face. 
     
     
         19 . The battery according to  claim 18 , wherein the first side projecting portion and the second side projecting portion are located on the frame portion. 
     
     
         20 . The battery according to  claim 19 , wherein the first side projecting portion and the second side projecting portion are located within a thickness of the frame portion.