Victor Company of Japan, Limited

Mitsubishi Mining and Cement Co. Ltd.

Kiyoaki Suzuki

Hidetsugu Suzuki

Makoto Iwahara

Atsushi Sakamoto

Masaru Watanabe

Tomoharu Hayashi

Hisashi Yamamoto

Takuji Miura

Yoshiaki Fukuda

Isami Nomoto

Katsuhiro Onuki

Takeshi Sato

An information signal recording disc is recorded with a stereoscopic television signal comprising a stereoscopic video signal and audio signals. The disc comprises a spiral track made up of a plurality of track turns, and video signals related to four fields are recorded on each of the plurality of track turns. Each track turn is time-sequentially recorded with right-eye and left-eye video signals of mutually different field numbers out of the right-eye and left-eye video signals of a simultaneous stereoscopic television signal in a sequence of field numbers together with audio signals, so that the right-eye video signal and the left-eye video signal are respectively recorded for a time period of two fields in each track turn. The right-eye and left-eye video signals related to identical fields are recorded side by side to each other in two mutually adjacent track turns. A predetermined sequence with which the right-eye and left-eye video signals are recorded on the spiral track is repeated with a period of eight fields.

Information signal recording disc recorded with stereoscopic television

A stereoscopic television system and apparatus comprise a memory for storing right-eye information related to odd and even fields and left-eye information related to the odd and even fields, a circuit for producing a main scanning direction synchronizing signal for synchronizing a scanning in a vertical direction of a reproduced picture and a sub scanning direction synchronizing signal for synchronizing a scanning in a horizontal direction of the reproduced picture, where the sub scanning direction synchronizing signal has a frequency which is m.+-.1/4 times a frequency of the main scanning direction synchronizing signal and m is a natural number, and a display device for reproducing and displaying in synchronism with the main and sub scanning direction synchronizing signals the right-eye information related to the odd and even fields and the left-eye information related to the odd and even fields which are successively read out from the memory in synchronism with the main scanning direction synchronizing signal.

Stereoscopic television system and apparatus with 4 to 1 interlace

A loudspeaker diaphragm comprising a molded, sintered ceramic body is described. The body is made of ceramic crystalline particles whose maximum size is below 1/5 time a thickness of the body which is in the form of a dome or cone. The dome- or cone-shaped diaphragm may have a flange along an opening side thereof in order to prevent deformation as may occur during firing.

Loudspeaker diaphragm made of a molded, sintered ceramic body

A speaker diaphragm assembly comprises a body made of a foam resin, and a sound radiating surface portion integrally formed with the body. In one embodiment, the sound radiating surface portion is made of a foam resin the density of which is greater than that at the body. In another embodiment, the sound radiating surface portion comprises a thin layer made of a solid resin, which thin layer is welded to the body. The rear end portion of the body may be reinforced in the same manner. In another embodiment, a supporting member is attached to the side surface of the diaphragm body for increasing the efficiency in vibration transmission from the voice coil. In another embodiment, a ring-like recess is made in the side surface of the body for spaced electrical terminals, to which heat is transmitted from the voice coil via lead wires, from the body, while a sub cone having low thermal conductivity is sandwiched between the lead wires and the body.

Speaker diaphragm assembly and a method of manufacturing the same

The diaphragm of a speaker is supported by a viscous supporting member placed in an annular gap defined between the periphery of the diaphragm and the inner surface of a frame structure and by a conventional damper. Grooves may be made in the periphery of the diaphragm and in the inner surface of the frame structure for receiving some portions of the viscous supporting member. In another embodiment, a film made of a resin is welded to the front surface of a diaphragm body which is made of a foam resin. In other embodiments, one or more reinforcing members are fixedly adhered to both the voice coil bobbin and the flat rear surface of the diaphragm.

Growing community of inventors

Zama, Japan

Kiyoaki Suzuki