A driving apparatus which is capable of smoothly moving a follower by a cam portion, and realizes the stopper structure of the follower by a small number of components without the size increased. The driving apparatus comprises an up cam gear having an up radial cam and an up thrust cam, and a down cam gear unit having a down radial cam and a down thrust cam. The up cam gear and the down cam gear unit mesh with each other in a vicinity of a region in which a lift amount of the up radial cam with respect to the follower increases. In a vicinity of a position at which the up cam gear and the down cam gear unit mesh with each other, a lift amount of the up thrust cam is larger than a lift amount of the down thrust cam in the thrust direction.

A method of film production includes the steps of obtaining defect information including information on the position of a defect (D) in a separator original sheet (12b), slitting the separator original sheet (12b) to produce a plurality of separators (12a), and determining, on the basis of the defect information on a single defect (D), that a separator (12a) actually having the defect (D) and another separator (12a) adjacent to the above separator (12a) are defective.

To easily specify the position of a defect in a separator, a method for producing a separator original sheet (12b) includes the steps of: forming a separator original sheet (12b) including a separator original sheet (12c) and a heat-resistant layer coated on the separator original sheet (12c); detecting a defect (D) in the separator original sheet (12b); and recording information including information on a position of the defect (D) which position is a position in the width direction of the separator original sheet (12b).

A separator producing method includes the steps of: winding up, around a core (81, 53), a separator (12a, 12b) having a defect (D) detected; and providing a defect code (DC2) including information on a position of the defect (D) in the longitudinal direction of the separator (12a, 12b) on (i) the outermost portion (86, 86b) of the separator (12a, 12b), wound around the core (81, 53), or (ii) the core (81, 53), around which the separator (12a, 12b) is wound.

This optical element driving device is provided with: a movable part capable of holding an optical element; a housing housed the movable part; a driving part that includes an ultrasonic motor and drives the movable part; a boosting part having an inductor that boosts input voltage inputted to the driving part and supplies the boosted input voltage to the ultrasonic motor; and a board part on which the inductor is disposed. The ultrasonic motor includes piezoelectric elements generating vibration by the input voltage and a resonant portion resonating with the vibration of the piezoelectric elements, the inductor is covered by a cover portion, and the housing is cut out at a location corresponding to the inductor.

This optical element driving device is provided with: a movable part capable of holding an optical element; a housing housed the movable part; a driving part that includes an ultrasonic motor and drives the movable part; a boosting part having an inductor that boosts input voltage inputted to the driving part and supplies the boosted input voltage to the ultrasonic motor; and a board part on which the inductor is disposed. The ultrasonic motor includes piezoelectric elements generating vibration by the input voltage and a resonant portion resonating with the vibration of the piezoelectric elements, the inductor is covered by a cover portion, and the housing is cut out at a location corresponding to the inductor.