In a digital camera, a solid state imaging device is used to catch subject light so that an image signal is created. The primary case has a front casing and a rear housing. The data parts are stored in a plurality of buffers, so that if one or more data parts of a current frame is corrupted or lost, the corresponding data part in the neighboring frames is used to conceal the errors in the current frame. When light output degrades to a preset level, an electrical circuit triggers a disabling short circuit to deactivate the LED signal. The apertures are configured to permit a shank portion of a bolt to pass therethrough such that in the connecting or clamping condition, the shanks pass through the aligned apertures of the first plate, belt ends and second plate. More specifically, the present invention relates to optically active quinoline carboxylic acid derivatives containing 4-aminomethyl-4-methyl-3–alkoxyirninopyrrolidine substituents causing optical activity at the 7-position of the quinolone nuclei.