Nihon Dempa Kogyo Co., Ltd.

Kouichi Moriya

Hidenori Harima

Hiroaki Mizumura

Tsutomu Yamakawa

Kenichi Sugawara

Kuichi Kubo

Toshiaki Takeuchi

Katsuyuki Sato

Yoshinori Narita

There is provided a configuration in which a lead-out electrode that extends out from an excitation electrode provided on a lower surface of a crystal piece facing an inner bottom surface of a container main body, is connected to a crystal terminal of an IC chip via a conducting path provided on the inner bottom surface of the container main body, and the conducting path is superimposed, in plan view, on the excitation electrode of the lower surface of the crystal piece, and the excitation electrode of the lower surface and the conducting path have the same electric potential, to thereby suppress the occurrence of stray capacity therebetween. As a result, stray capacity occurring in the conducting path that connects the excitation electrode and the IC terminal is made small, thereby preventing variations in oscillating frequency.

Surface mount type crystal oscillator

The crystal oscillator for surface mounting includes: a container body having first and second recesses on both principal surfaces thereof; a crystal blank hermetically encapsulated within the first recess; and an IC chip in which an oscillation circuit using the crystal blank is integrated, the IC chip being accommodated within the second recess. The IC chip is provided with a plurality of IC terminals including a pair of crystal terminals used for electrical connection with the crystal blank. A plurality of mounting electrodes to which the IC terminals are connected through flip-chip bonding are formed on a bottom surface of the second recess in correspondence with the IC terminals. A pair of mounting electrodes corresponding to the pair of crystal terminals are electrically connected to the crystal blank and also formed as a pair of dual-purpose electrodes having greater areas than the other mounting electrodes.

Crystal oscillator for surface mounting

A surface-mount type crystal oscillator includes: a container body with a first recess and a second recess; a crystal blank including excitation electrodes on respective principal surfaces thereof and hermetically encapsulated in the first recess; and an IC chip which is accommodated in the second recess and into which at least an oscillation circuit using the crystal blank is integrated. The container body includes a bottom wall and a frame wall provided on the bottom wall. Two openings which make up the first and second recesses, respectively, are formed in juxtaposition in the frame wall. A pair of inspection terminals are provided in an area of a top surface of the frame wall which surrounds the second recess. The inspection terminals are electrically connected to the excitation electrodes of the crystal blank.

Surface-mount type crystal oscillator

A surface mount crystal oscillator comprises a crystal blank, an IC chip having an oscillation circuit integrated thereon, and a hermetic package for accommodating the crystal blank and IC chip therein. The hermetic package comprises a substantially rectangular ceramic substrate formed with a metal film which makes a round on one main surface thereof, and a concave metal cover having an open end face bonded to the metal film. The IC chip is secured to the one main surface of the ceramic substrate through ultrasonic thermo-compression bonding using bumps, the crystal blank is disposed above the IC chip, and the ceramic substrate has the one main surface formed as a flat surface.

An object of the invention is to provide a surface mount type crystal oscillator in which a probe can be easily brought into contact with a crystal inspection terminal. The surface mount type crystal oscillator is such that a crystal piece and an IC chip are housed within a container main body having a bottom wall and frame wall formed with laminated ceramics, and a communication terminal is provided on an outer side surface of the container main body. The communication terminal is provided so as to span from the outer side surface of the bottom wall to the outer bottom surface of the outer wall, the communication terminal is made the crystal inspection terminal, and the crystal piece and the IC chip are arranged in parallel on the inner bottom surface within the container main body.

Surface mount crystal oscillator

A quartz crystal device includes: a crystal unit in which a crystal blank is hermetically encapsulated; and a mounting substrate housing an IC chip on which a circuit using the crystal blank is integrated. By joining an external terminal of the crystal unit and a bonding terminal of the mounting substrate, the mounting substrate is joined to the crystal unit to be integrated, and the quartz crystal device is configured. In the quartz crystal device, a crystal monitor terminal electrically connected to the bonding terminal is provided on an outer side surface of the mounting substrate, and even in a state in which the crystal unit and the mounting terminal are integrated, a vibration characteristic of the crystal blank is measurable by using the crystal monitor terminal.

Quartz crystal device including monitor electrode

A surface-mount type crystal oscillator has: a container body having a bottom wall and a frame wall having an opening and provided on one principal surface of the bottom wall; a quartz crystal blank hermetically encapsulated in a recess of the container body, which is formed by the opening of the frame wall; and an IC chip on which an oscillating circuit using the crystal blank is integrated. A region which is a region on the one principal surface of the bottom wall and other than formation regions of the frame wall and the recess is made a flat part, and the IC chip is fixed to the one principal surface of the bottom wall by flip-chip bonding, in the flat part. A crystal inspection terminal electrically connected to the crystal blank is provided on a surface of the flat part.

A surface mount type crystal oscillator is provided with a crystal blank, an IC chip which incorporates an oscillation circuit using the crystal blank, a substantially rectangular parallelepiped container body for surface mounting which houses the crystal blank and the IC chip, and mounting electrodes provided in four corners of an outer bottom surface of the container body. Each of the mounting electrodes is provided so as to extend over a side surface of the container body as an end face electrode. At least one adjustment terminal is disposed above the end face electrode on the side surface of the container body electrically isolated from the end face electrode. The adjustment terminal is longer along the height direction of the container body than the end face electrode.

A surface mount crystal oscillator has a package body having a recess and formed with a step on an inner wall of the recess, a flat base plate having a peripheral region secured to the step, a crystal blank secured to the flat base plate, an IC chip having an oscillation circuit, using the crystal blank, integrated therein, and secured to a bottom surface of the recess, and a cover for closing the recess. The crystal blank is disposed above the IC chip within the recess, and the IC chip and the crystal blank are hermetically sealed within the recess.

A surface mount type crystal oscillator comprises: a package body comprised of laminated ceramic including a flat central layer made up of a first layer and a second layer, and a first and a second frame layer; a crystal blank hermetically sealed in a first recess defined by the first layer and the first frame layer; an IC chip placed in a second recess defined by the central layer and second frame layer; and a shield electrode disposed on a laminated surface of the second layer with the first layer. First and second electrode through-holes are formed through the first layer and second layer, respectively, for electrically connecting the crystal blank to the IC chip. The first and second electrode through-holes are positioned in areas outside the mounting position of the IC chip on the second recess.

A surface mount crystal oscillator comprises: a crystal blank; an IC chip in which at least an oscillator circuit using the crystal blank is integrated; a mounting substrate having one main surface on which the crystal blank is disposed, and the other main surface used to mounting the crystal oscillator on a wiring board; and a cover bonded to the mounting substrate for hermetically sealing the crystal blank within a space between the mounting substrate and the cover. The mounting substrate has the one main surface extending outward from a region in which the cover is disposed such that a portion of the one main surface exposes. Test terminals which are electrically connected to the crystal blank are disposed on the exposed region of the one main surface.

A crystal device for surface mounting is provided with at least: a container body having a substantially rectangular outer shape and mounting electrodes formed in the four corners of the outside bottom surface of the container body; and a crystal blank hermetically sealed within the container body. The spacing of mounting electrodes on at least one side of the outside bottom surface is less than the length of the mounting electrodes in the direction along that side. A jetty having a height greater than the thickness of the mounting electrodes is provided in the cross-shaped area interposed between the mounting electrodes on the outside bottom surface.

Surface mount type crystal device

A surface mount type temperature-compensated crystal oscillator includes a crystal blank; an IC chip integrating an oscillation circuit using the crystal blank and a temperature compensation mechanism of compensating frequency temperature characteristics of the crystal blank; and a substantially rectangular parallelepiped container body for surface mounting having a first recess of housing the crystal blank and a second recess of housing the IC chip. Respective side surfaces corresponding to the long sides of the container body are provided with crystal inspection terminals for inspecting oscillation characteristics of the crystal blank and respective side surfaces corresponding to the short sides are provided with data writing terminals for writing temperature compensation data to the temperature compensation mechanism. A conductive path electrically connecting the IC chip to the crystal inspection terminal is formed to be shorter than a conductive path electrically connecting the IC chip to the data writing terminal.

Growing community of inventors

Saitama, Japan

Kouichi Moriya