Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Reexamination Certificate
2001-09-24
2004-03-09
Budd, Mark (Department: 2834)
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
C310S31300R
Reexamination Certificate
active
06703768
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a piezoelectric generator mounted with a crystal oscillator for obtaining reference signals for the control of radio communication apparatuses, portable telephones, pagers, cordless telephones, audiovisual apparatuses, etc.
2. Description of the Prior Art
In piezoelectric generators that are used in the field of mobile radio communication such as radio communication apparatuses, portable telephones, etc., a crystal oscillator and an electronic component (active element) for its oscillation are stored in a container, in general.
With the oscillation element and the electronic component thus stored in one container, an organic substance from a resin-based adhesive that is used to fix the electronic component may adhere to the oscillation element, thereby lowering its oscillation properties.
An example of prior art which solves this problem is explained below with reference to
FIGS. 1A and 1B
.
An oscillator sealing chamber
6
a
is provided on one side of a multi-layer ceramic substrate
3
a
, and a crystal oscillator plate
4
a
is placed in the sealing chamber
6
a
and hermetically sealed by means of a lid
5
a
. Printed patterns and circuit elements
2
a
that form a generator circuit are arranged on the other side of the multi-layer ceramic substrate
3
a
or on the side opposite to the oscillator chamber
6
a
, and are covered by means of a casing
1
a
that has an adjusting hole
8
a
. Thereupon, a generator is formed. This generator is mounted on a motherboard by means of reflow electrodes
7
a
that are provided on a side face of the ceramic substrate
3
a.
In the generator described above, the oscillation element is first mounted in the chamber on the one side and subjected to frequency regulation, and its opening is then sealed. Then, an electronic component is mounted on the other side and loaded with temperature compensation data. However, a mounting surface that carries the electronic component thereon is exposed in the upper surface. In case where the mounted electronic component is damaged, therefore, the previously mounted oscillation element, as well as the electronic component, have to be scrapped together with the container, so that the cost increases. Thus, in order to make the electronic component inaccessible, it has to be concealed with a casing.
To deal with the problem, proposed is a generator that is designed so that no organic substance from the resin-based adhesive for the electronic component fixation can adhere to the oscillation element and that the electronic component or oscillation element can be reused as a non-defective if it is damaged. An outline of this generator will now be described with reference to
FIGS. 2A and 2B
.
A first container
1
b
, which is formed of a laminate of ceramic sheets, is molded in the shape of an open-topped box. An active element
2
b
, an electronic component formed of a bare chip, is fixed in the container
1
b
with an adhesive.
An oscillation unit
3
b
is attached to the upper surface of an outer peripheral wall
4
b
of the first container
1
b
so as to cover an opening of the container
1
b
. The oscillation unit
3
b
, which is formed of a laminate of ceramic sheets, includes an open-topped second container
5
b
, an oscillation element
6
b
formed of a crystal oscillator mounted in the second container
5
b
, and a metallic shielding plate
7
b
that covers an opening of the second container
5
b
. By welding the shielding plate
7
b
to the second container
5
b
, the oscillator element
6
b
is hermetically sealed in the second container
5
b.
Two semicylindrical notches
10
b
are formed on each of two opposite sides of an outer peripheral wall
8
b
of the second container
5
b
. Second connecting electrodes
11
b
1
to
11
b
4
are formed on the respective inner surfaces of the notches
10
b
and the bottom face continuous therewith (connecting electrodes
11
b
2
and
11
b
3
, which are located on the back side in
FIG. 2A
, are not shown). The electrodes
11
b
1
and
11
b
3
, among the four second connecting electrodes
11
b
1
to
11
b
4
, are connected electrically to the oscillator element
6
b
, while the electrodes
11
b
2
and
11
b
4
are connected electrically to a seam ring
9
b
and grounded.
On the other hand, the active element
2
b
that is mounted on the first container
1
b
is connected electrically to electrodes
13
b
by means of wires
12
b
. First connecting electrodes
14
b
1
to
14
b
4
, which are connected to any of the electrodes
13
b
, are provided individually in four positions on the outer peripheral wall of the first container
1
b
. The first connecting electrodes
14
b
1
,
14
b
2
,
14
b
3
and
14
b
4
are connected electrically to the second connecting electrodes
11
b
1
,
11
b
2
,
11
b
3
and
11
b
4
, respectively, by means of a conductive adhesive material such as solder. Thus, the oscillation
6
b
and the active element
2
b
are connected electrically to each other.
After the electrical connection between the first and second electrodes
14
b
1
to
14
b
4
and
11
b
1
to
11
b
4
is completed, a bond sealing resin
15
b
is applied to the outer peripheral portion of the bottom face of the second container
5
b
, whereupon the second container
5
b
is fixedly bonded to the upper surface of the outer peripheral wall
4
b
of the first container
1
b
. Thus, the top opening of the first container
1
b
is sealed with the second container
5
b
to protect the active element
2
b.
Semicylindrical notches are formed in the outer peripheral surface of the outer peripheral wall
4
b
of the first container
1
b
, and electrodes
16
b
01
to
16
b
14
are provided in the notches, individually. Among these electrodes, the electrodes
16
b
02
,
16
b
06
,
16
b
09
and
16
b
13
are also formed in the bottom face of the first container
1
b
that are continuous with the notches. The electrodes
16
b
02
,
16
b
06
,
16
b
09
and
16
b
13
are an AFC terminal, grounding terminal, oscillation output terminal, and power terminal, respectively. The other electrodes are inspection electrodes, which are situated at a given upward distance from the bottom face of the first container
1
b
. These electrodes are used for data loading in a memory in the active element
2
b
and various inspections.
According to the prior art described above, however, the active element and the oscillation element are mounted in the first and second containers, respectively, which are stacked in layers to form a double-deck package, so that the overall thickness of the generator is inevitably great.
Although the electrodes for external connection that are formed in the notches of the outer peripheral wall of the first container and the bottom face thereof are situated at the given upward distance from the bottom face, the distance is very short, and the inspection electrodes are located directly adjacent to them. If the electrodes for external connect are soldered to patterns of the motherboard or the like, solder may flow and cause a short circuit.
SUMMARY OF THE INVENTION
A piezoelectric generator in an aspect of the present invention comprises an oscillator package, including a piezoelectric oscillator sealed in a container and electrodes for external connection formed on the surface of the container, and an electronic component mounted integrally on the oscillator package. The electronic component is mounted on the same surface of the container that carries the electrodes for external connection thereon.
REFERENCES:
patent: 4750246 (1988-06-01), Pollard
patent: 5471722 (1995-12-01), Yatsuda
patent: 5500628 (1996-03-01), Knecht
patent: 5818145 (1998-10-01), Fukiharu
patent: 6011693 (2000-01-01), Gore
patent: 6049256 (2000-04-01), Fry
patent: 6229249 (2001-05-01), Hatanaka et al.
patent: 09005105 (1997-01-01), None
patent: 09167918 (1997-06-01), None
patent: 10098151 (1998-04-01), None
patent: 11-308052 (1999-05-01), None
patent: 2000252747 (2000-09-01), None
patent: 2000269741 (2000-09-01), N
Kageyama Noboru
Omura Atsushi
Shimizu Kiyoshi
Wakabayashi Hisao
Budd Mark
Citizen Watch Co. Ltd.
Smith , Gambrell & Russell, LLP
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