Matsushita Electric Industrial Co., Ltd.

Nitto-Denko Corporation

Seiichi Watanabe

Makoto Nakamura

Toshihiko Sugimoto

Fuyuki Eriguchi

Fujio Itoh

Junichi Sakai

Digital still camera

A reinforcement for a flexible printed circuit board, which can sufficiently prevent the flexible printed circuit board thus reinforced from being warped when heated during the assembly process of electronic components or other procedures. The reinforcement according to the present invention is used to adhere to a flexible printed circuit board 1. The reinforcement according to the present invention comprises an internal material 21 having a bending neutral surface at the center of the thickness thereof, and an external material 22 having the same Young's modulus as that of an insulating substrate 11 of the flexible printed circuit board 1, bonded to one side of the internal material 21. The other side of the internal material 21 acts as an adhesive surface to the flexible printed circuit board 1.

Reinforcement for flexible printed circuit board and reinforced flexible

In a floppy disc drive unit, the rotational speed of a floppy, a write current fed to a write head, electric characteristic of a signal processing circuit in a read circuit are all controlled so as to set them to values suitable for selected mode corresponding to magnetic recording data density. A switching signal is either manually produced or fed from an external circuit so as to effect switching between normal density mode and high density mode. The floppy disc drive unit according to the present invention is therefore capable of handling floppy discs of different density values.

Floppy disc drive unit

Growing community of inventors

Osaka, Japan

Seiichi Watanabe