Vibrating reed, vibrator, oscillator, and electronic device

Details Vibrating reed, vibrator, oscillator, and electronic device Vibrating reed, vibrator, oscillator, and electronic device

2002-03-01

2004-04-20

Nguyen, Minh (Department: 2816)

Oscillators

Electromechanical resonator

Vibrating reed or string type

C310S361000, C310S370000

Reexamination Certificate

active

06724271

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a vibrating reed formed of, for example, a crystal, a vibrator having the vibrating reed, an oscillator having the vibrator, and an electronic device having the vibrator.
DESCRIPTION OF THE RELATED ART
Conventionally, a tuning-fork-type crystal vibrating reed is constructed as shown in, for example, FIG.
17
.
More specifically, a tuning-fork-type crystal vibrating reed
10
comprises a base
11
, and two arm sections
12
and
13
formed so as to protrude from the base
11
. In these two arm sections
12
and
13
, through grooves
12
a
and
13
a
are formed.
More specifically, as shown in
FIG. 18
which is an A-A′ sectional view of
FIG. 17
, the arm sections
12
and
13
are formed with the through grooves
12
a
and
13
a.
In such a tuning-fork-type crystal vibrating reed
10
having the through grooves
12
a
and
13
a
in the arm sections
12
and
13
, as shown in
FIG. 18
, excitation electrodes
12
c
and
13
c
can be arranged in the inner sides of the through grooves
12
a
and
13
a
, respectively.
As a consequence, an electric field is effectively generated between excitation electrodes
12
d
and between excitation electrodes
13
d
arranged on the outer sides of the arm sections
12
and
13
, respectively, and thus the arm sections
12
and
13
can be vibrated efficiently. Therefore, the vibrating reed becomes a tuning-fork-type crystal vibrating reed
10
having a small vibration loss.
However, when a voltage is applied to such a tuning-fork-type crystal vibrating reed
10
having the through grooves
12
a
and
13
a
in order to vibrate the arm sections
12
and
13
, since the through grooves
12
a
and
13
a
are formed in the arm sections
12
and
13
, the rigidity of the entire arm sections
12
and
13
is insufficient, and a problem arises in that the CI value (crystal impedance or equivalent series resistance) increases.
Furthermore, the vibrations of the arm sections
12
and
13
are performed as shown in FIG.
19
. Only both end portions of the through grooves
12
a
and
13
a
vibrate, and the bending motion of the entire arm sections
12
and
13
will not likely occur.
The vibration is produced in the vicinity of, for example, 16 kHz on both end portions of such through grooves
12
a
and
13
a
, and another problem arises in that the frequency is considerably decreased in comparison with 32.768 kHz required by the tuning-fork-type crystal vibrating reed
10
.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a vibrating reed in which, even if through grooves are provided in vibration arm sections, the frequency is not decreased, and the CI value is not increased, a vibrator having the vibrating reed, an oscillator comprising the vibrator, and an electronic device comprising the vibrator.
According to the present invention, preferably, vibrating reeds from (1) to (10) below are provided.
(1) A vibrating reed comprising: a base; and a vibration arm section formed so as to protrude from this base, wherein a through groove is formed in the vibration arm section, and a rigidity reinforcing section is provided in the through groove.
(2) A vibrating reed, wherein the rigidity reinforcing section is a coupling section formed so as to span the through groove.
(3) A vibrating reed, wherein the through groove has a longer side and a shorter side, and the coupling section is a side bar which is coupled so as to span the longer side.
(4) A vibrating reed, wherein the length of the side bar along the thickness direction is substantially the same as the length of the through groove along the depth direction.
(5) A vibrating reed, wherein the length of the side bar along the thickness direction is shorter than the length of the through groove along the depth direction.
(6) A vibrating reed, wherein the side bar is formed shorter than the length of the through groove along the depth direction by half etching.
(7) A vibrating reed, wherein a plurality of the side bars are arranged.
(8) A vibrating reed, wherein a cut section is formed in the base.
(9) A vibrating reed, wherein the base is provided with a fixation area for fixing the vibrating reed, and the cut section is provided in the base between the fixation area and the vibration arm section.
(10) A vibrating reed, wherein the vibrating reed is a tuning-fork vibrating reed formed of a crystal which oscillates at nearly 32 kHz.


REFERENCES:
patent: 4384232 (1983-05-01), Debely
patent: 4450378 (1984-05-01), Hermann et al.
patent: 4724351 (1988-02-01), EerNisse et al.
patent: 4785215 (1988-11-01), Blech
patent: 5156460 (1992-10-01), Norling et al.
patent: 56065517 (1981-06-01), None
patent: 60-070808 (1985-04-01), None
patent: 11-023285 (1999-01-01), None

Affiliated with

Also associated with

Rating

Vibrating reed, vibrator, oscillator, and electronic device does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Vibrating reed, vibrator, oscillator, and electronic device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Vibrating reed, vibrator, oscillator, and electronic device will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3248350