Source: http://patents.com/us-7687723.html
Timestamp: 2018-11-15 02:07:45
Document Index: 192531197

Matched Legal Cases: ['application No. 2005', 'art 10', 'art 10', 'arts 10', 'art 1', 'arts 14', 'arts 10', 'art 1', 'art 1', 'art 1', 'arts 10', 'arts 10', 'arts 10', 'arts 10', 'art 24', 'arts 25', 'art 25', 'art 24', 'arts 25', 'art 25', 'art 24', 'art 24', 'art 24', 'arts 25', 'arts 25', 'art 24', 'arts 25', 'art 25', 'art 24']

US Patent # 7,687,723. Mounting substrate and microphone mounted thereon - Patents.com
United States Patent 7,687,723
Izuchi , et al. March 30, 2010
Inventors: Izuchi; Toshiro (Fukuoka, JP), Ono; Kazuo (Fukuoka, JP), Nakanishi; Kensuke (Fukuoka, JP), Onishi; Hiroaki (Fukuoka, JP)
Appl. No.: 11/483,303
Jul 08, 2005 [JP] 2005-199754
Current U.S. Class: 174/260 ; 174/261
Field of Search: 174/260-261
6239385 May 2001 Schwiebert et al.
1 530 401 May., 2005 EP
2015299 Sep., 1979 GB
52-079872 Jul., 1977 JP
53-147262 Dec., 1978 JP
11-214449 Aug., 1999 JP
2000-189893 Jul., 2000 JP
2003-153392 May., 2003 JP
2004-006454 Jan., 2004 JP
2004-303797 Oct., 2004 JP
WO 2005/013641 Feb., 2005 WO
Notification of Reason(s) for Refusal for JP patent application No. 2005-199754 issued May 26, 2009. cited by other.
1. A mounting substrate on which a component is mounted by soldering, the component having a central terminal and a peripheral terminal formed around the central terminal, the mounting substrate comprising: a central electrode part that faces the central terminal; a plurality of outer electrode parts that face part of the peripheral terminal, wherein there are spaces between the outer electrode parts; a linkage electrode part formed on the mounting substrate outside the peripheral terminal that interconnects the outer electrode parts; a solder part formed on each of the central electrode part and the outer electrode parts; a resist film formed to prevent the solder of said solder part from flowing out of a predetermined range; and a gas-escape groove that is constituted by the absence of said central electrode part, the outer electrode parts and said resist film, is surrounded with walls of said resist film, and formed at least between a pair of outer electrode parts to interconnect areas on inner and outer sides of the peripheral terminal.
3. A microphone mounted on a mounting substrate according to claim 1 or 2, wherein the microphone has an electrode (referred to as central terminal hereinafter) and another electrode (referred to as peripheral terminal hereinafter) formed around the central terminal, and said central terminal and said peripheral terminal protrude beyond an outer housing of the microphone, and said peripheral terminal is ring-shaped.
Here, the solder bump electrodes 11 and 12 of the microphone are formed in the procedure shown in FIG. 3A, FIG. 3B, and FIG. 3C. As shown in FIG. 3A, a circular conductor part 10a corresponding to the output terminal and a ring-shaped conductor part 10a corresponding to the grounding terminal are formed on the outer surface of the circuit board 10 of the microphone. As shown in FIG. 3B, a resist film 10b is formed on the conductor parts 10a excluding the areas on which the solder bump electrodes 11 and 12 are to be formed. As shown in FIG. 3C, the solder bump electrodes 11 and 12 are formed on the areas in which no resist film 10b is formed in such a manner that the solder bump electrodes 11 and 12 protrude beyond a caulked part 1a.
In addition, in the reflow oven, the solder bump electrodes 11 and 12 and the solder parts 14 and 15 are made molten, and the solder flows over a wide area. Thus, the resist film 10b also comes into contact with the molten solder. In this way, a wide area of the circuit board 10 comes into contact with the molten solder, so that the heat is likely to be conducted to the interior of the microphone through the circuit board 10. The heat once conducted to the interior of the microphone causes a stress therein and adversely affects the same. For example, the sensitivity of the electret may be reduced.
FIG. 4A is a perspective view showing the appearance of a microphone, FIG. 4B is a plan view of a circuit board 10 of the microphone, and FIG. 4C is a cross-sectional view of the microphone showing a relationship among a central terminal 20, a peripheral terminal 21 and conductor parts 10a on the circuit board 10. The central terminal 20 has a circular shape and is formed on an outer surface of the circuit board 10. The peripheral terminal 21 is ring-shaped and is formed around the central terminal 20. Typically, the central terminal 20 constitutes an output terminal, and the peripheral terminal 21 constitutes a grounding terminal. In addition, the central terminal 20 and the peripheral terminal 21 protrude beyond an outer housing (a capsule 1 and a caulked part 1a) of the microphone. Specifically, the central terminal 20 and the peripheral terminal 21 are higher than the caulked part 1a at the edge of the capsule 1. For example, if the caulked part 1a has a height of 0.1 mm, the central terminal 20 and the peripheral terminal 21 have a height of 0.3 mm. The cross-sectional view of FIG. 4C is taken along the line B-B in FIG. 4B. The central terminal 20 and the peripheral terminal 21 are formed on the conductor parts 10a formed on the circuit board 10. For example, the central terminal 20 and the peripheral terminal 21 may be composed of a copper foil covered with an antioxidant film of nickel or gold. Furthermore, the central terminal 20 and the peripheral terminal 21 can be formed simultaneously with the conductor parts 10a by changing the plating condition of the conductor parts 10a. The conductor parts 10a may be formed by trimming a copper foil covering the circuit board 10.
Now, a production method for and an arrangement of the mounting substrate according to the present invention will be described with reference to the drawings. FIG. 5A is a plan view of the mounting substrate 13 on which electrodes are formed. FIG. 5B is a cross-sectional view taken along the line C-C in FIG. 5A. The electrodes are a central electrode part 24 intended to face the central terminal 20 of the microphone, a plurality of outer electrode parts 25 intended to face parts of the peripheral terminal 21 of the microphone, and a linkage electrode part 25a that links the outer electrode parts with each other. The central electrode part 24 is surrounded by the outer electrode parts 25 and the linkage electrode part 25a. The central electrode part is in communication with the outside via a leading electrode part 24a. Instead of the leading electrode part 24a, a through hole may be formed in the mounting substrate 13 to bring the central electrode part into communication with the backside of the mounting substrate 13.
In the example shown in FIG. 7A, most area of the mounting substrate 13 is covered with the resist film. However, the resist film 26 can be formed arbitrarily as far as the resist film 26 prevents the solder from flowing to the outside of the central electrode part 24 and the outer electrode parts 25. For example, a resist-film-free area 29 may be formed that constitutes an integral gas-escape groove as shown in FIG. 10. Alternatively, a resist-film-free area may be formed on the outer side of the outer electrode parts 25. Furthermore, the resist film 26 may be formed only along the outer peripheries of the central electrode part 24 and the outer electrode parts 25 and on the linkage electrode part 25a and the leading electrode part 24a.
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