Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1997-07-03
1999-11-09
Dougherty, Thomas M.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310348, 310349, 310353, H01L 41047, H01L 41053
Patent
active
059820772
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a surface mounted piezo-electric transducer unit and, more particularly, to an arrangement of the internal wiring thereof.
BACKGROUND ART
In recent years, surface mounted piezo-electric transducer units which can be easily mounted on a surface of a printed-circuit board are used for piezo-electric transducers such as crystal oscillators for clocking sources of personal computers, communication devices, and the like. In these surface mounted piezo-electric transducers, the following attempted improvements are publicly known: corresponding to a change in temperature by changing double and support into cantilever-like support or reducing stress caused by the difference in thermal expansion between the transducer and its container. its longer sides two pairs of electrodes for connecting it to a container and thus enabling the transducer and container to be assembled regardless of the directions of their longer sides when the transducer is automatically fitted into the container.
A conventional piezo-electric transducer unit will be described below with reference to the drawings.
FIG. 1 is a perspective view of components of a conventional piezo-electric transducer unit. A piezo-electric transducer unit 100 comprises a substrate 101 of ceramic insulating materials, a thickness-mode crystal oscillator 102 (hereinafter referred to as "AT crystal oscillator 102"), and a ceramic cap 103. On an upper surface of the substrate 101, there are a rectangular concavity 104 for housing the AT crystal oscillator 102 and separating grooves 105 and 106 for separating conductive adhesives. Each of the separating grooves 105 and 106 is on opposite sides of a centerline of the substrate 101 parallel to its shorter sides. The AT crystal oscillator 102 is of the so-called convex type and has an excitation electrode 121 and outgoing electrodes 122 and 123 connected thereto, which are mounted fast on its upper and lower surfaces by vacuum evaporation, sputtering, and so forth. The AT crystal oscillator 102 may be a rectangular AT plate of uniform thickness. The AT crystal oscillator 102 is housed in the concavity 104 on the substrate 101, and the outgoing electrodes 122 and 123 are fixed, with conductive adhesives, onto connecting electrodes 107 and 110 or 108 and 109 respectively. Then frequency adjustment is performed as necessary and the cap 103 is joined onto the substrate 101, which completes the crystal oscillator unit 100.
FIGS. 2, 3, and 4 are diagrams showing the state of metallic wire on the substrate 101. FIG. 2 is a front view, FIG. 3 is a view from the direction of an arrow 130 in FIG. 2, and FIG. 4 is a rear view.
A surface (hereinafter referred to as "the mounting surface") of the substrate 101 shown in FIG. 2 is where the AT crystal oscillator 102 is mounted, and is nearly square. For convenience of the following explanation, it is assumed that a centerline of the near square parallel to its longer sides is an X-axis and that a centerline of the near square parallel to its shorter sides is a Y-axis. The concavity 104 is also nearly square and its center lines are identical to the above X- and Y-axis respectively. There are connecting electrodes at positions contiguous to four corners of the concavity 104. An X-Y plane formed by the above X- and Y-axis has four quadrants each of which has one connecting electrode. That is, the first quadrant has a first connecting electrode 107; the second quadrant has a second connecting electrode 108; the third quadrant has a third connecting electrode 109; and the fourth quadrant has a fourth connecting electrode 110.
The separating groove 105 lies both on the first quadrant and on the fourth quadrant, and is arranged between the first connecting electrode 107 and fourth connecting electrode 110 for preventing these electrodes from short-circuiting. The separating groove 106 lies both on the second quadrant and on the third quadrant, and is arranged between the second connecting electrode 108 and third connecting electrode 109 for preve
REFERENCES:
patent: 4583019 (1986-04-01), Yamada et al.
patent: 4757581 (1988-07-01), Yamada et al.
patent: 5525855 (1996-06-01), Gotoh et al.
patent: 5585687 (1996-12-01), Wakabayashi et al.
patent: 5699027 (1997-12-01), Tsuji et al.
patent: 5828159 (1998-10-01), Miyagawa et al.
patent: 5841217 (1998-11-01), Kizaki et al.
patent: 5844348 (1998-12-01), Gamo
Ide Toshinori
Wakabayashi Hisao
Citizen Watch Co. Ltd.
Dougherty Thomas M.
Miyota Co., Ltd.
LandOfFree
Piezo-electric transducer unit does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Piezo-electric transducer unit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Piezo-electric transducer unit will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1460694