Fuji Photo Film Company, Limited

Hiromasa Hino

Makoto Murakoshi

Hitoshi Hirobe

In a field/frame conversion system in which a field signal recorded on a track of a recording medium is repeatedly reproduced, a field signal delayed by 1/2 horizontal scanning duration and a directly provided field signal are alternately selected by a switch at each vertical scanning duration, and one of the field signals is formed by an arithmetic mean of a signal delayed by 1 horizontal scanning duration and a directly provided signal, to provide a frame signal, a flicker preventing circuit device in a field/frame conversion comprises a circuit provided in a front stage of an arithmetic mean circuit of the field/frame conversion system for bringing a gamma value of the field signal to 1, and a gamma circuit provided in a rear stage of the arithmetic mean circuit for returning the gamma value of the field signal to its original value.

Television flicker preventing circuit with gamma value conversion prior

A magnetic recording and reproducing system is provided with a cleaning mechanism wherein a cleaning pad contacts a rotary magnetic head to clean said magnetic head during inertial rotation of said magnetic head.

Magnetic recording and reproducing system with a cleaning mechanism

A recording error-prevention system in which an abnormal position of a camera set in a continuous-recording mode of operation, relative to the horizontal position, is detected by a position-sensing device and an alarm is given by an alarm device on the condition of this detection and, if the alarm is not cleared for a predetermined period of time, recording is stopped by an auto-stop device.

Recording error-prevention system

A rotary magnetic head assembly for use in recording and playing back video signals including a rotary head drum, a stationary head drum, and magnetic heads. The rotary head drum is supported by a driving shaft and has an outer surface which is generally cylindrical. The rotary drum is rotatable when driven by the shaft. The stationary head drum is disposed coaxially with the rotary drum, and has an outer surface which is generally cylindrical and substantially equal in diameter to the outer surface of the rotary drum. The rotary drum has a first surface opposing the stationary drum with shape formed by a generatrix not perpendicular to the shaft such as a conical or cylindrical. The stationary drum has a second surface opposing the first surface of the rotary drum. The second surface is generally of a shape about the shaft, which is complementary to the first surface to form an air gap between the rotary and stationary head drums through which air flows to form an air film on the outer surfaces of the drums. The magnetic heads are supported on the rotary drum closely to the outer surface of the rotary drum in the gap. The generatrices may preferably be straight, stepwise or gently curved. Coil windings of a rotary transformer of the first and second surfaces may be mounted in grooves provided on the first and second surfaces, and affixed therein by a fixing agent to preferably form smooth and flat surfaces continuous to the first and second surfaces, respectively.

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Tokyo, Japan

Hiromasa Hino