Abstract: An optical pickup device with an objective lens movable in two directions comprises a supporting member having a plate-shaped supporting portion mounted with a bobbin to which an objective lens is attached. The bobbin is mounted so that it can be freely moved in a first direction parallel to the optical axis of the objective lens and/or in a second direction perpendicular to the optical axis of the objective lens, and an electromagnetic driving device drives the bobbin in the first and second directions. The supporting member is unitarily formed with four arms supporting the bobbin at one end and a coupling portion for connecting the four arms at the other end.

Abstract: A shadow mask type color cathode ray tube which has a face panel whose screen face is flattened to more than two times the flatness of the conventional flat panels without reducing the resistance of the glass bulb to outside pressure in spite of its relatively thin glass wall, and has an enhanced reflection characteristic of incident light as well as improved local doming characteristics.

Abstract: A flexible magnetic diskette used for magnetically storing various information which is recorded and read by a magnetic head. The diskette includes a flexible plastic disk sheet uniformly coated with magnetic material and having a mount hole at its center, and a holder for securing the disk sheet over the periphery of the mount hole. The holder is also made of a plastic material for holding the flexible disk sheet over the peripheral portion of the mount hole via a double-sided adhesive ring. A core member is made of a magnetic metal having a high abrasive resistance and rigidly attached to the holder over at least a part of a surface of the holder, with which a drive unit is engaged.

Abstract: A color picture tube includes a rectangular shadow mask having a longer axis and a shorter axis. The shadow mask has a curved surface. A point of the curved surface of the shadow mask is represented by an orthogonal coordinate system having an X component, a Y component, and a Z component. The coordinate system has an origin coincident with a center of the curved surface. The X component is measured along the longer axis. The Y component is measured along the shorter axis. The Z component is measured in a direction perpendicular to directions of the longer and shorter axes. A sagittal height of the curved surface represented by the Z component and measured from the origin is given by a polynomial including a term of a sixth-degree power of one of the X component and the Y component.

Abstract: In a color picture tube, curvature of outside face of said face panel is defined by ##EQU1## wherein Z is a distance in a direction of tube axis from an X-Y plane tangential at the center of the face, r is a distance from the center of the face panel to said point therealong, and A and B are constants of positive integers, respectively; thus the face panel excludes point of inflection and the reproduced picture thereon has a flat appearance, without trouble of undesirable doming of shadow mask.