Nec Corporation

Nippon Electric Co., Ltd.

Kiyotake Nagai

Hiroshi Nakajima

Hidehiko Inoue

Yasuichi Ushiyama

Sadayuki Ikeda

An image sensing device for a TV camera and method of driving the same is disclosed whereby the effective charge accumulation time in each light-sensing row in the imaging area can be reduced thereby eliminating fuzzy images produced when fast moving objects are picked up. The driving circuit of the imaging device gives the sensor a shutter function of less than 1/60 second and up to 1/2000 second exposure time without changing the structure of the sensor. There is provided a method in which charges accumulated in each row of the light-sensing elements are taken out and discarded at an optional time during an active video period, leaving an effective charge accumulation period of less than 1/60 second.

Method of driving a two-dimensional CCD image sensor in a shutter mode

A television camera is provided with an automatic gain selecting unit which is responsive to the iris value of the lens attached to the camera. The automatic gain selecting unit includes a comparator for determining when the camera lens-iris operates within a medium 'window' range, a counter for counting upwardly or downwardly when the lens-iris operates outside of the window range, and a decoder for outputting a control signal to a gain selecting amplifier to adjust the gain thereof, in response to the operation of the counter.

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Tokyo, Japan

Kiyotake Nagai