unit 420 mounted on a main substrate in other words the imaging unit 410 performs for example automatic gain control agc optical black ob clamp cds and ad conversion on an output signal from the mos type solid state imaging device and generates and outputs a digital imaging signal an imaging optical system 400 includes a zoom lens 401 a diaphragm adjusting mechanism 402 and the like disposed in a lens tube the imaging optical system 400 is for forming the image of the subject on a light receiving portion of the mos type solid state imaging device a driving control unit 430 based on the system control unit 420 performs control so as to mechanically drive the portions included in the imaging optical system 400 so that automatic focusing is controlled the system control unit 420 includes a central processing unit cpu 421 a read only memory rom 422 a random access memory ram 423 a digital signal processor dsp 424 an external interface 425 and the like the cpu 421 sends an instruction to each of portions in the camera apparatus by using the rom 422 and the ram 423 and controls the overall system the dsp 424 performs various signal processing on the imaging signal sent from the imaging unit 410 and generates a still image signal or a moving image signal for example a yuv signal or the like based on a predetermined format the external interface 425 includes a type of encoder and a da converter various control signals or data is exchanged between an external element.