Citizen Watch Company, Ltd.

Other

Miyota Co., Ltd.

Cimeo Precision Co., Ltd.

Hisao Wakabayashi

Toshinori Ide

Toshihiko Nakayama

Isao Koyama

Hiroshi Hishida

Kazunari Kume

Yukio Miya

Katsuo Nishimura

Takayasu Machida

Atsushi Omura

Yasuhiro Ogura

Kiyoshi Shimizu

Yoshiyuki Ohishi

Takatoshi Osaka

Kunio Suganuma

Hiroshi Mabuchi

Hisao Yoshikawa

Hiroshi Kurafuji

Hiroaki Takayanagi

Takeshi Murata

Toshihide Ooi

Toshiya Hayashi

Churyo Seki

Toshimitsu Aruga

Noboru Kageyama

Shinji Nakayama

A crystal oscillator is mounted on a ceramic substrate so that the crystal oscillator is sealed air tight. The peripheral portion of the lower surface of the substrate is provided with electrodes for external connection that project downward from the lower surface of the substrate. An electronic component is mounted on the lower surface of the substrate.

Piezoelectric generator and mounting structure therefor

In a piezoelectric vibrator having a center supporting piezoelectric vibrating reed, one edge of an almost rectangular piezoelectric vibrating reed is fixed at two places of a case by a comparatively hard conductive adhesive. Also, the other edge facing the above-mentioned one edge is fixed at two other places of the case by a comparatively soft adhesive. Further, the case and a lid to cover the piezoelectric vibrating reed which constitute a container for the piezoelectric vibrator are sealed using a glass material having a low melting point of 340&deg; C. or less. Further, in the case of a cantilever supporting piezoelectric vibrating reed, stoppers made of soft adhesive are formed at the top and bottom of the other edge facing the above-mentioned one edge with a slight clearance being provided.

Piezoelectric vibrator

A base (,) has a substantially cylindrical plug (,) penetrated by two leads,A piezoelectric oscillator (,) is secured to and supported on ends of the two leads by supports (,). The supports (,) are formed from solder having as high lead content of more than 60% by weight, preferably 85 to 98% by weight. A cap (,) open at one end is fitted on the piezoelectric oscillator (,). The plug (,) seals the open end of the cap (,) and forms a gas-tight casing, thus forming a piezoelectric oscillator unit with piezoelectric oscillator (,) held gas-tight in the inside. The high lead content solder is soft and has a low Young's Modulus, so that it can disperse stress when the piezoelectric oscillator experiences. It is thus possible to evade stress concentration on the piezoelectric oscillator (,) and improve shock resistance. A layer of a solder with a lead content of 60% by weight or less or of tin or a tin alloy, is formed on the surface of the leads (,), and ensures solder wetting property.

Piezo-electric transducer unit

A piezoelectric oscillator comprises a piezoelectric oscillating reed, an insulating substrate for retaining the piezoelectric oscillating reed, and a cap fixed onto the top surface of the insulating substrate for enclosing the piezoelectric oscillating reed. Four connecting electrodes are formed on the top surface of the insulating substrate for electrical connection to the oscillating reed, which are divided into two groups. Each group includes two connecting electrodes which are connected to each other by metal interconnects. The insulating substrate is rectangular, and two connecting electrodes, each of which belong to one group, are located along the shorter sides of the insulating substrate. On the bottom surface of the insulating substrate, at least two external electrodes are formed, to which metal interconnects for each group are connected through the side surface of the insulating substrate.

Piezolelectric oscillator

The present invention provides a floppy disk drive which can removably receive a cartridge containing a floppy disk and which can travel a READ/WRITE head to the desired track on the floppy disk while rotating the floppy disk at a constant speed for effecting the desired read/write action under an electric-magnetic conversion. The drive is of a top-up type which includes a frame portion and a carrier which can be popped up from the frame portion. The frame portion includes a spindle motor for directly driving the floppy disk, a plurality of positioning pins for positioning the disk cartridge relative to the spindle motor, and a carriage carrying the READ/WRITE head for travelling the head to the desired track on the disk. The carrier is pivotably supported by the frame portion and adapted to receive the disk cartridge. The cartridge can be loaded into the lower portion of the carrier upon popping-up of the carrier. When the carrier is engaged by the frame, the cartridge is upwardly moved to a predetermined position within the carrier.

Floppy disk drive having a pivotally supporting cartridge carrier

A supporting structure for a thickness-shear type crystal oscillator for watches which has an excellent resistance to shocks, which is very compact in construction and which can support not only an annular crystal piece but also support a rectangular crystal piece is disclosed. The supporting structure comprises a supporting frame which is provided at its opposed inner periphery with tongues adapted to be engaged with corresponding notches provided on opposed end portions of a crystal piece, respectively.

Supporting structure for a thickness-shear type crystal oscillator for

An electronic optical display device comprising two substrates and an electronic optical substance sealed in a gap formed between said substrates and displaying when an electric voltage is applied thereto is disclosed. The device comprises two upper and lower substrates which are the same in plane configuration and a lead electrode extending along the side surface of said substrates and is most suitable for use in a thin type digital watch.

Electronic optical display device and method of manufacturing the same

An improved AT-cut crystal oscillator for electronic watches. The AT-cut crystal oscillator is of substantially disc-shape. Furthermore, the AT-cut crystal oscillator is shaped in cross-section such that the periphery of the disc-shaped crystal oscillator is abruptly tapered. In the preferred embodiment, the cross-section is trapezoidal.

Shape, AT-cut crystal oscillator

The invention relates to a support structure for a thickness-shear mode, convex lens type oscillator. The support structure contains an elastic ring made from an insulating material such as nylon. This ring is formed with a plurality of spaced, radially inwardly and integrally extending projections from the ring proper and said projections represent concentric recesses of opposite configurations one after another adapted for establishing pressure contact with the quartz crystal at their opposite surfaces and at different peripheral areas thereof.

Supporting structure for a thickness-shear type quartz oscillator

Growing community of inventors

Tokorozawa, Japan

Hisao Wakabayashi