Abstract: A thinner secondary battery can be provided by a thin secondary battery characterized by comprising a battery element obtained by stacking positive electrode layers, electrolyte layers and negative electrode layers and laminates sealing front and back surfaces of the battery element, wherein the laminates each are made of a stacked body constructed of at least an adhesive layer and a metal layer in the order from the battery element side and the metal layer in the front surface side of the battery element and the metal layer in the back surface side thereof are different from each other in strength or thickness, or both of them.

Abstract: Featured is a magnetic drum assembly including a rotary drum supporting a magnetic head for recording/reproducing information on a magnetic tape and a stationary drum secured to a base of a magnetic recording/reproducing device. In one aspect of the invention, the stationary drum is molded from a resin material together with a metal material partially embedded and partially exposed and being secured at the exposed part of the metal to the base of the magnetic recording/ reproducing device. In another aspect of the invention, the rotary drum is molded from a resin material together with a metal material partially embedded and partially exposed and the magnetic head is secured at the exposed part of the metal of the rotary drum. Such a drum assembly is advantageous in that it is capable of maintaining an initial accuracy of its sizes and shape without deterioration in its mechanical properties over time due to creep deformation and internal stress.

Abstract: The present invention has been achieved to provide a novel tape cassette capable of stable and excellent magnetic recording and reproducing operations realizes highly accurate head touch necessary for tendency to Hi-Fi and digitization with a simple structure that does not require relatively high shape accuracy. In order to achieve the above object, a novel tape cassette for use in magnetic recording/reproducing apparatus of fixed head type, comprises: magnetic tape 2, a pressure pad 3 and a pad base 13 having the pressure pad 3 fixed thereon, incorporated in a tape cassette 10, being characterized in that when a magnetic head 8 is inserted in the tape cassette 10, the pad base 3 is positioned relative to the magnetic head 8 by positioning pins 17a and 17b disposed in the magnetic recording/reproducing apparatus.

Abstract: A magnetic recording/reproducing apparatus includes a guide roller which rotates as magnetic tape runs, and the running speed of the tape is detected on the basis of the rotation of the guide roller. The magnetic recording/reproducing apparatus further calculates a radius of a supply reel from the rotation of the guide roller and the rotation speed of the supply reel, calculates driving torque of the supply reel from the calculated result, and the supply reel is driven so that the tension of the magnetic tape is kept constant according to the calculated result.

Abstract: A magnetic recording and reproducing apparatus utilizing a magnetic tape in a cassette, the tape being driven by reels and information data being recorded or reproduced on or from the magnetic tape. The apparatus includes a mechanism for pulling or storing the magnetic tape out of or in the cassette which mechanism includes a pair of guide rollers for restricting the running path of the magnetic tape, the guide rollers being movable between an unloading position and a loading position. A magnetic head, which can be a multi-track magnetic head having a plurality of magnetic heads, the number of which is defined to be smaller than the number of tracks standardized as a track format on the magnetic tape, records or reproduces information-data when the guide rollers are in their loading position and the head is allowed to vertically move each time the running direction of the magnetic tape is changed.

Abstract: In an electrically excited transfer recording device which transfers an image or images formed in a recording film onto a recording chart, a recording head is comprised of a head base of resin having insulating properties and a plurality of electrode needles formed on the head base. During the printing, a resistance layer formed in the recording film is electrically charged by the electrode needles and ink contained in the recording film is fused upon generation of heat in the resistance layer to be transferred onto the recording chart.