Nihon Dempa Kogyo Co., Ltd.

Daisuke Nishiyama

Hiroyuki Murakoshi

Kenji Kasahara

Toshimasa Tsuda

Hiroyuki Sasaki

Tomotaka Kuroda

Makoto Hatano

Masakazu Nishiwaki

Kenichi Kikuchi

Hiroyuki Mitome

Hiroya Ishikawa

A solder material includes an alloy of at least five elements including Sn, Cu, Sb, and In, and 20 mass % or less of Ag. The solidus temperature of the solder material is higher than 290&#xb0; C., the liquidus temperature of the solder material is 379&#xb0; C. or less and is higher than the solidus temperature, and the temperature difference between the liquidus temperature and the solidus temperature is 70&#xb0; C. or less.

Solder material and electronic component

An oscillator that can suppress a solder crack caused by a temperature change by a simple structure at low cost and improve heat cycle resistance performance is provided. The oscillator includes an epoxy resin board and an electronic component mounted on the board. Two-terminal electrode patterns are formed on the board, and connected to terminal electrodes of the electronic component by solder. A projection is formed on each of the electrode patterns at a part connected to a corresponding terminal electrode to create a space between the terminal electrode and the electrode pattern, and the solder forms a fillet in the space. This contributes to enhanced adhesion strength of the solder.

Oscillator

Provided is an oven controlled crystal oscillator which can reduce an occurrence of cracks in an applied solder of a large-sized circuit component and improve reliability. It is an oven controlled crystal oscillator in which a slit is formed in a periphery or below a lower surface of a large-sized circuit component provided on the substrate, further, a plurality of small-sized circuit components, which are smaller than the large-sized circuit component, are disposed around the large-sized circuit component, as necessary, and for the plurality of small-sized circuit components, an electronic component, which is electrically connected, and a dummy electronic component, which is not electrically connected, are used.

Oven controlled crystal oscillator

Provided are an oven controlled crystal oscillator in which in a case where a metal lead is soldered to a substrate, even if cracks occur in the solder, its reliability is not reduced, and a production method. That is, an oven controlled crystal oscillator in which pre-tinning solders are formed around openings on a front surface and a rear surface of a substrate in which of a through hole for passing a metal lead therethrough is formed; and in a state where a metal lead including a solder layer (a pre-tinning solder) formed on its surface is inserted into the through hole of the substrate, the metal lead extending from the openings is soldered to the openings on the front surface and the rear surface of the substrate, so as to form a main solder, and a production method of the oven controlled crystal oscillator are provided.

Oven-controlled crystal oscillator and manufacturing method of the same

A metal base having plural protrusions at its bottom is engaged with and placed on standing metal pins in plural through holes provided in a base board, and a circuit board is fitted to an upper end of the metal pins. A crystal resonator is arranged on the circuit board via a heater element, and the metal base is covered with a metal cover, thereby obtaining a sealed structure of the crystal resonator. A two-stage counterbored portion including a first-stage and a second-stage counterbored portions is formed in the bottom of the base board, and a solder or conductive resin is filled in a gap between the first-stage counterbored portion formed around the metal pin inserted into the through hole, and the through hole and the metal pin to fix the metal pin in the though hole. Slits penetrating through the base board are formed around the metal pin.

Growing community of inventors

Sayama, Japan

Daisuke Nishiyama