Nihon Dempa Kogyo Co., Ltd.

Kenichi Sugawara

Kouichi Moriya

Hidenori Harima

Manabu Ito

Hiroaki Mizumura

Toshiaki Takeuchi

A crystal oscillator for surface mounting comprising: a case main body including concave portions on both principal surfaces; a crystal element hermetically encapsulated in one concave portion; an IC chip housed in the other concave portion; mounting terminals provided on four corner portions of an opening end face of the other concave portion; and a protrusion serving as identifying marks along a direction of sides of the case main body and provided in some of the mounting terminals. The mounting terminals, to which the protrusions are provided, are provided on both corner portions on one end side of the case main body. The protrusions extend in a same direction from the mounting terminals at an inner or outer circumference side of the opening end face. The mounting terminals including the protrusions are symmetric with respect to a center line between both corner portions on the one end side.

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

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 surface-mount crystal oscillator includes a crystal unit housing and an element housing which is provided on the base side of the crystal unit housing. A crystal blank is accommodated and hermetically sealed in the crystal unit housing. A concavity having an open side is formed in the element housing, and an IC chip is secured to the bottom surface of the concavity by means of face-down bonding. Notch portions or recess portions which are adjoining and connecting to the concavity and which are used for injecting fluid resin are formed in the frame portion at the periphery of the concavity. Fluid resin is injected to the bottom surface of the concavity by way of the notch portions and cured to form a protective resin layer of the IC chip.

Growing community of inventors

Saitama, Japan

Kenichi Sugawara