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Crystal device used for surface mounting

A surface mount, crystal technology, applied in the direction of electric solid devices, semiconductor devices, electrical components, etc., can solve the problems of spatter, electrode roller welding condition limitation, air tightness loss, etc., to achieve the effect of increasing the degree of freedom of design

Inactive Publication Date: 2013-10-23
NIHON DEMPA KOGYO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] For this reason, welding conditions such as welding current including the rotation speed of the electrode roller are strictly limited
However, in reality, if the welding conditions such as welding current are strictly limited within a small range, then the welding current varies with power fluctuations, etc., which causes loss of airtightness or spatter

Method used

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  • Crystal device used for surface mounting
  • Crystal device used for surface mounting
  • Crystal device used for surface mounting

Examples

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Embodiment Construction

[0036] figure 1 is a plan view for explaining a surface mount unit according to an embodiment of the present invention. Incidentally, the same parts as those in the related art are denoted by the same symbols, and descriptions thereof are simplified or omitted.

[0037] As described above, the surface mount unit that is longer in the direction of the X-axis is configured such that the crystal element 2 is housed in the ceramic case 1 formed as an AT-cut crystal element that is placed in the ceramic case 1. Rectangular shape in plan view, which includes bottom wall 1a and frame wall 1b (refer to figure 2 ), whose cross-section is formed into a concave shape. The ceramic housing also includes an inner wall shoulder (intermediate wall) 1c disposed between said bottom wall 1a and frame wall 1b. Then, the metal cover 3 is joined by seaming to the metal ring 4 provided at the end face of the opening of the ceramic case 1 to hermetically encapsulate the crystal element 2 . The ...

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Abstract

The invention provides a crystal device. The internal area of a ceramic housing is designed relatively large to increase the design freedom degree of the crystal device (the crystal element). The crystal device used for surface mounting is structured that at least a crystal element (2) is arranged in a rectangular ceramic housing (1) as shown in the layout plan; wherein the crystal element with a concave section comprises a footwall (1a) and a frame wall (1b); a metal cover (3) is jointed to a metal ring (4) through seam welding; the metal ring (4) which is arranged on the end surface of the opening of the ceramic housing (1) hermetically seals the crystal element (2), wherein the width of one of the long side and the short side of the metal ring is narrower than the other.

Description

technical field [0001] The present invention relates to the technical field of crystal devices for surface mounting suitable for miniaturization, and in particular, to a crystal device in which a crystal element is hermetically packaged by seam welding. Background technique [0002] Crystal devices such as crystal units, crystal oscillators or crystal filters for surface mounting are commonly referred to as frequency control components. For example, a crystal unit for surface mounting (hereinafter, referred to as a surface mount crystal unit) is incorporated into an oscillator circuit to be incorporated into various types of electronic equipment as a frequency source or a time reference. In recent years, further progress has been made in its miniaturization, for example, which makes its planar profile 2.0×1.6mm or smaller. [0003] image 3 is a schematic diagram for illustrating a related art surface mount unit, where image 3 (a) is a cross-sectional view of a related art...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03H9/02
CPCH01L2924/16195
Inventor 村濑重善石丸千里
Owner NIHON DEMPA KOGYO CO LTD
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