A device for detecting the rotating phase of rotary magnetic heads of a video tape recording apparatus in order to synchronize the rotation of the rotating heads with the synchronizing signals recorded, or to be recorded on the video tape is disclosed. A magnet piece is positioned upon a rotating disc or drum carrying rotary magnetic heads adjacent to one of rotary heads, and detecting coils as a phase detecting elements are mounted upon mounts in such a way that they may be movable along the pa...

An optical information recording and reproducing disc information has a substrate in the surface of which are formed signal recording grooves and cue signal recording pits. A light-absorbing thin film is formed on the surface of the substrate, the optical characteristics of the light-absorbing film being changeable thermally through irradiation by a light beam. The pitches of the grooves and pits, as well as the widths of the grooves and pits, are determined to meet specific conditions in relati...

An apparatus utilizing a flat plate type rotary transformer which has a rotary member with a collar fixed thereon, a stationary member provided with a bearing, the rotary member being mounted on the stationary member through the collar and the bearing, a first magnet core which is securely held on the rotary member and a second magnet core which is securely held on the stationary member. The magnet cores respectively of the rotary member and the stationary member are securely set by using the su...

A card reader for reading the predetermined information stored on a card, comprising a card kicker plate slidable in the direction of card insertion and capable of contacting with the end of an inserted card. After reading an inserted card, the card kicker plate is moved to elevate the read card from the device by a certain amount, thereby making the ejection of the card easy.

A tape guiding drum for a magnetic recording and reproducing apparatus including a rotary magnetic head, a lower drum having a cylindrical tape guide surface formed on the upper peripheral portion thereon, and an upper drum having a cylindrical tape guide surface on the lower peripheral portion thereof and disposed above the lower drum so as to leave a slit between the drums, the rotary magnetic head being provided within the slit and the tape being obliquely run around the drums, straddling the...

A reel mount elevating mechanism which is so constructed that an energy for elevating a vertically movable reel mount is accumulated incident to the movement of a cartridge inserted in a direction perpendicular to the direction in which said reel mount is movable, and is released when the cartridge has reached a predetermined position relative to said reel mount, whereby said reel mount is elevated by said energy.