Victor Company of Japan, Limited

Masayoshi Uchida

Kazuhiro Sato

Tsuyoshi Ono

Norio Shibata

Katsuhiko Oguri

Hidetoshi Sato

Takashi Saito

Osamu Tajima

Masafumi Mochizuki

Norimasa Arai

A signal-pickup cartridge is adapted to be loaded into a holder of a signal-pickup device proper of a rotating recording medium reproducing apparatus. The signal-pickup cartridge comprises a cantilever having at its distal tip a reproducing element for picking up and reproducing a signal from a rotating recording medium rotating in the apparatus, a cartridge case supporting therewithin the cantilever and having a ceiling plate and vertical walls on opposite sides thereof, a box-shaped cover joinable to the cartridge case to cover the lower face thereof in a manner to protect the cantilever and the reproducing element, and a mechanism for joining the cover and the case in latched state. This mechanism is triggered to unlatch the cover from the case when the cartridge is inserted into the holder.

Signal-pickup cartridge for a rotary recording medium reproducing

A pickup cartridge comprising a cantilever and a stylus attached to the free end of the cantilever. The cantilever is formed with a flat portion and a ribbed portion extending along the length of the flat portion so that the transverse cross-section of the cantilever is of a cruciform configuration. The flat and ribbed portions are dimensioned so that the cantilever tends to oscillate at a frequency different from the resonant frequencies of disc records.

Pickup cartridge having a ribbed cantilever

A signal pickup device in a rotary recording medium reproducing apparatus, comprises a cantilever provided with a reproducing element for picking up and reproducing a signal from a rotary recording medium at the tip end thereof, a support member having a support part for supporting the rear end part of the cantilever, and arms which unitarily extend on both sides from the support part, and a frame having engaging parts engaged with and mounted with the arms of the support member, for holding the arms. The arms of the support member respectively are provided with mounting parts having non-circular cross-section in the vicinity of the end part thereof, for engaging with the engaging parts of the frame. Moreover, the mounting parts and the engaging parts are shaped so that the support member is at an angular position together with the cantilever where the reproducing element is at a raised position, when the mounting parts are mounted onto the engaging parts.

Signal pickup device in a rotary recording medium reproducing apparatus

A moving-coil type pickup cartridge comprises a vibration system including a stylus for tracing a sound groove of a record disc, at least one coil plate adapted to vibrate in response to vibration of the stylus of the vibration system, and an arrangement for producing magnetic fields with respect to the coil plate. The coil plate has at least one coil formed by thin film in a spirally-shaped pattern. The magnetic field producing arrangement has at least one permanent magnet for producing magnetic fields wherein are produced magnetic fluxes of mutually opposite directions respectively in regions of the coil resulting from substantially halving of the coil in the vibration direction thereof.

Pickup cartridge having means for producing magnetic fields of opposite

A moving-coil type pickup cartridge comprising a cantilever provided at the free end thereof with a stylus for tracing a sound groove of a record disc, a coil plate provided on the cantilever in a manner to vibrate in response to vibration of the stylus, and an arrangement for producing an effective magnetic field within a specific gap. The coil plate comprises a thin electrically insulating base plate and at least one coil which is formed from a thin film in a spirally-shaped pattern on at least one surface of the base plate. The coil plate has at least one upright part formed by bending the base plate together with a portion of the coil and interposed in a freely vibratory manner within said gap of the magnetic field producing arrangement and a mounting part integrally joined to the upright part and fixed to the cantilever.

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Yokohama, Japan

Masayoshi Uchida