Abstract: In a magnetic recording apparatus for a camera using a film having a magnetic recording portion, a magnetic recording device records photographic data on the magnetic recording portion while the film is wound after a photographic operation corresponding to one frame is completed. An electrically erasable nonvolatile storage device stores the photographic data after the photographic operation corresponding to one frame is completed. A magnetic reproducing device reproduces the photographic data recorded on the magnetic recording portion while the film is rewound. A determining device determines whether the photographic data reproduced by the magnetic reproducing device coincides with the photographic data stored in the storage device. When the determining device determines that the two photographic data do not coincide with each other, a re-recording device causes the magnetic recording device to re-record the photographic data stored in the storage device on the magnetic recording portion.

Abstract: A plurality of lens groups are movable in the direction of an optical axis. A plurality of motors are provided for the lens groups, respectively, so as to drive the lens groups. A focusing distance detector detects the position of a lens group which is one of the lens groups and which is changed in position in accordance with a change in the focusing distance, and outputs focusing distance data in accordance with the data representing the detected position of the lens group. A lens position detector detects the positions of the lens groups other than the lens group. A memory stores positional relationships between the predetermined lens group and the other lens groups. A zooming operation member is used for commanding a zooming operation.

Abstract: A plurality of lens groups are moveable in the direction of an optical axis. A plurality of motors are provided for the lens groups, respectively. A driving circuit drives the motors. A switching section sequentially selects the motors and connects the selected motors to the driving circuit. A lens position-detecting section detects the positions of the lens groups. A driving control section sequentially drives the lens groups in accordance with intermediate target position data, respectively, via the switching section and the driving section, and determines whether the lens groups have reached their respective intermediate target positions, on the basis of the detection performed by the lens position-detecting section. When the driving control section determines that the lens groups have reached their respective intermediate target positions, it demands next intermediate target positions, which are slightly away from the initially-determined intermediate target positions.

Abstract: A system for automatically erasing a pair of tracks whenever a designated track to be erased belongs to a pair of tracks representing a frame picture.In the system, detecting means detects ID codes indicating field/frame recording mode of a recorded track and feeds a detected signal to a controller, then the controller takes an appropriate action to erase the pair of frame recorded tracks by timely activating head accessing means and an erasing signal generator based on the ID codes, whenever the tracks correspond to a frame picture.