The function control levers of a magnetic tape recorder are selectively locked into place by a locking lever which is movable transversely to the direction of movement of the control levers. A stop lever which moves in parallel to the direction of movement of the other function control levers includes a cam engaging projection thereon for engaging a cam surface on the locking lever to effect release of the locking lever from a previously locked control lever to stop the operation of the tape rec...

A slot-in type cassette tape recorder/player unit of the type in which a tape cassette is laterally inserted into the recorder/player unit through an opening provided on the front panel thereof includes a movable cassette holder shifted between first and second vertical positions so that the tape cassette can be brought into and released from operable engagement with the tape transport mechanism and magnetic heads of the device. An indicator plate is carried by the cassette holder and is moved i...

A cassette loading apparatus for use in a cassette tape device having a housing with an opening adapted to receive a cassette tape cartridge and having a cassette holding frame within the housing adapted to receive the tape cartridge. The holding frame is movable between a first position aligned with the opening when the cartridge is inserted into the device and a second position wherein the tape cartridge is held in the play position against the tape drive mechanism. A retention lever engageabl...

A magnetic recording and reproducing apparatus is provided which is selectively applicable for tape cartridges and tape cassettes and which is formed with an entryway into which a tape cartridge or a tape cassette is to be inserted. A first magnetic tape head is located deeper in the entryway for playing the tape contained in the cartridge and a second magnetic tape head is located below the entryway for playing the tape contained in the cassette. A holder for receiving and conveying the tape ca...

A tape recorder/player includes several slideable mode selector control levers for selecting the reproducing, recording, stop and other modes of operation of the player. To prevent operation of these levers when the cassette or tape is not in the player, a slideable cam plate is provided, which in a first position engages projections on the levers to prevent them from being moved into their operative positions. In a second position, a number of slots in the cam plate are aligned with the project...

A magnetically recording and reproducing apparatus selectively applicable to a tape cartridge and a tape cassette and having a first magnetic tape head for playing the tape contained in the cartridge and a second magnetic tape head for recording and reproducing the cassette tape. This apparatus comprises an entryway formed and adapted for receiving the cassette or the cartridge, a holder normally disposed in the entryway for receiving and conveying the cassette, a first means responsive to the c...

A tape recorder/player includes several slideable mode selector control levers for selecting the reproducing, recording, stop and other modes of operation of the player. To prevent operation of these levers when the cassette or tape is not in the player, a slideable cam plate is provided, which in a first position engages projections on the levers to prevent them from being moved into their operative positions. In a second position, a number of slots in the cam plate are aligned with the project...

A retention device for a cassette tape recorder comprises a cassette holder, a platform, a movable plate, a slide plate and a retention lever. The cassette holder is adapted to receive a tape cassette and is movable vertically so that the tape cassette may be engaged and disengaged with the tape drive means. The platform supports magnetic transducer heads and a pinch roller and is slidable so as to cause the heads and pinch roller to come into engagement with the magnetic tape in the cassette. T...

A device for controlling a conversion ratio of a movement amount of a cursor includes units that: confirms whether a change of resolution is within a correction target range, based on resolution information obtained by a display terminal device; that calculate the movement amount of input values obtained from a pointing device; calculate a movement correction coefficient according to the calculated movement amount calculate a ratio correction coefficient based on a ratio of the resolution to a r...

A call signal generating circuit includes a DC/DC converter, an ON/OFF control unit, including a control circuit and a phototransistor, for ON/OFF-controlling an output voltage from the DC/DC converter, and a polarity inverter cooperating with the control circuit, for switching polarities of an ON/OFF-controlled voltage. The ON/OFF timings of the ON/OFF control unit and a polarity switching timing of the polarity inverter are adjusted to generate a call signal having an arbitrary frequency.