Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Reexamination Certificate
2001-04-13
2003-09-30
Tamai, Karl (Department: 2834)
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
C310S311000, C310S310000
Reexamination Certificate
active
06628048
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a crystal oscillator with an improved shock resistance, in which a quartz blank of a crystal oscillator (which is made to oscillate at a constant frequency regardless of the temperature variation by utilizing the temperature stability characteristic and the piezoelectricity) is bonded to a cover by using a conductive adhesive, and the lengths of connecting parts and bridge parts are slightly extended so as to effectively disperse the stress of the connecting parts, so as to prevent the ruptures of the crystal oscillator upon receiving an impact, and so as to prevent the bonding defects, thereby improving the shock resistance.
BACKGROUND OF THE INVENTION
When the generally known crystal oscillator is installed in a mobile phone, it is made to be oscillated at a constant frequency regardless of the temperature variation by utilizing the temperature stability characteristic and the piezoelectricity.
In this crystal oscillator, the resonance frequency can be made to have a relatively low frequency band by using a bridge part which has a curved mode.
Under this condition, in this crystal oscillator, two bridge parts are symmetrically formed so as to achieve a perfect securing, and thus, the frequency distortions due to the supporting part are almost eliminated.
Such a crystal oscillator is illustrated in FIG.
1
.
As shown in this drawing, a pair of outer electrodes
10
are formed on the crystal oscillator
100
, and a pair of supporting protuberances
30
protrude within a main body
20
. A supporting part
60
of a quartz blank
50
is bonded onto the supporting protuberances
30
by using a conductive adhesive
40
. An oscillator cover
70
is secured upon the quartz blank
50
, thereby completing the crystal oscillator.
Under this condition, as shown in
FIG. 2
, the quartz blank
50
is constituted such that a pair of bridges
90
are integrally connected through a connecting part
80
to a supporting part
60
.
In the above described crystal oscillator, the supporting part
60
of the quartz blank
50
is bonded onto the supporting protuberances
30
by using a conductive adhesive
40
.
Then the oscillator cover
70
is secured to the top of the quartz blank
50
, thereby completing the crystal oscillator.
However, in the crystal oscillator installed in the mobile phone or the like, the quartz blank
50
which is installed within the oscillator main body
20
is very brittle. Therefore, the connecting part
80
of the quartz blank
50
is easily ruptured upon receiving an impact as result of dropping or the like. Thus the crystal oscillator becomes defective very frequently.
Particularly, the quartz blank
50
is bonded onto the supporting protuberances
30
simply by using a conductive adhesive
40
, and therefore, the bonded portion comes apart even under a weak impact.
SUMMARY OF THE INVENTION
The present invention is intended to overcome the above described disadvantages of the conventional technique.
Therefore it is an object of the present invention to provide a crystal oscillator with an improved shock resistance, in which an insulating resin is spread between a quartz blank and a cover, thereby reaping a shock resistant effect, and preventing the bonding defects and ruptures of the quartz blank.
It is another object of the present invention to provide a crystal oscillator with an improved shock resistance, in which bridge parts and connecting parts (between the bridge parts and the supporting part) are considerably extended so as to effectively disperse external impacts, so as to prevent the ruptures of the connecting part, and so as to prevent the crystal oscillator from being turned defective.
In achieving the above objects, the crystal oscillator with an improved shock resistance according to the present invention includes: an oscillator main body with a pair of supporting protuberances formed therein, a conductive adhesive being spread on the supporting protuberances; a quartz blank with its supporting part bonded onto the conductive adhesive of the supporting protuberances; a cover secured upon the quartz blank; and an insulating resin layer spread between the cover and the quartz blank, for elastically pressing down the conductive adhesive.
In another aspect of the present invention, the crystal oscillator with an improved shock resistance according to the present invention includes: a supporting part; a pair of connecting parts extended from the supporting part; and a pair of bridge parts elongately extending from the connecting parts,
characterized in that: the width of each of the connecting parts is longer than a width of each of the bridge parts,
wherein an outer edge of each of the connecting parts consist of a parallel part which is straightly extended from an outer edge of the supporting parts and a slant to an outer edge of the bridge parts.
REFERENCES:
patent: 2133647 (1938-10-01), Pierce
patent: 4047129 (1977-09-01), Ishiyama
patent: 4135108 (1979-01-01), Besson
patent: 4293986 (1981-10-01), Kobayashi et al.
patent: 4334168 (1982-06-01), Besson et al.
patent: 4734608 (1988-03-01), Takoshima
patent: 5453652 (1995-09-01), Eda et al.
patent: 5548178 (1996-08-01), Eda et al.
patent: 5623236 (1997-04-01), Yoshinaga et al.
patent: 5821665 (1998-10-01), Onishi et al.
patent: 5841217 (1998-11-01), Kizaki et al.
patent: 5920142 (1999-07-01), Onishi et al.
patent: 6046529 (2000-04-01), Yoshida et al.
patent: 6274968 (2001-08-01), Wajima et al.
patent: 6307300 (2001-10-01), Yamamoto et al.
patent: 6433466 (2002-08-01), Wajima
patent: 6445254 (2002-09-01), Shibuya et al.
patent: 6447887 (2002-09-01), Claus et al.
patent: 6472797 (2002-10-01), Kishimoto
patent: 6472798 (2002-10-01), Kishimoto
patent: 6507139 (2003-01-01), Ishino et al.
patent: 6541897 (2003-04-01), Endoh
patent: 6545392 (2003-04-01), Kawauchi et al.
patent: 6545393 (2003-04-01), Oguri et al.
patent: 09-107863 (1997-04-01), None
patent: 2002198768 (2002-07-01), None
Patent Abstract of JP Publication No. 10-303646: Nov. 13, 1998, Patent Application No. 09-107863.
Kim Hong Wook
Moon Yang Ho
Yang Doo Yeoul
Cuevas Pedro J.
Lowe Hauptman & Gilman & Berner LLP
Samsung Electro-Mechanics Co. Ltd.
Tamai Karl
LandOfFree
Crystal oscillator with improved shock resistance does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Crystal oscillator with improved shock resistance, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Crystal oscillator with improved shock resistance will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3030257