JPS5821443B2 - Closed container for crystal resonator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sealed container for a resonator in which the frequency of a crystal resonator body attached to a flexible leaf spring is adjusted from outside the case.

The object of the present invention is to easily adjust the frequency and number of the vibrator body by using a laser beam or the like after enclosing a tuning fork type crystal vibrator body attached to a flexible plate spring in a flat airtight container. To provide a sealed container for a vibrator which has a high Q value and is excellent in earthquake resistance and is to be used as a time standard for watches.

A container for a watch crystal resonator using a conventional tuning fork type resonator body is shown in FIGS. 1 and 2.

In the structure shown in Fig. 1, the vibrator body 1 is attached to the airtight terminal 4 of the cylindrical sealed container after adjusting the frequency using hanging wires 2 and 3, but this installation work and frequency adjustment work are extremely complicated and require a high level of skill. It takes.

In the structure shown in Fig. 2, the vibrator body 5 is directly fixed to the mounting base 6 of the closed container, but it is difficult to break off the vibrational coupling between the two, resulting in a decrease in the Q value and further vibration. There is a drawback that the overall size of the child is large.

Another drawback of the conventional method is that the final frequency adjustment is performed before the transducer body is sealed in the container, making it impossible to correct frequency fluctuations that occur during sealing, which degrades the performance of the transducer.

The present invention eliminates such drawbacks, and to explain the basic structure of the sealed container of the crystal resonator of the present invention, as shown in FIGS. The lead wire 15 of the airtight terminal and the electrode part 9 formed on the surface of the vibrator body are connected using conductive twisted lead foil. The electrical circuit is connected by 16, and the airtight container 1
7 and the lid 19 under vacuum.
and 22 for pressure welding.

The closed container lid 19 has a window 23 made of a light-transmissive member such as glass provided in a part of the lid, through which the tip of the vibrator body or the entire vibrator body can be viewed after the above-mentioned components are sealed in the container.

The vibrator body 7 in the present invention is cut into a tuning fork shape from a plate-like pellet, and C4 and Au are deposited on the surface of the vibrator body to form electrodes.

Further, an appropriate amount of a heavy metal or non-metal material 8 such as gold plating, brazing material, or organic adhesive is added to the tip of the tuning fork of the vibrator body.

For this heavy object, a vibrator body whose frequency has been roughly adjusted in advance is sealed in a sealed container via a flexible leaf spring, and then removed by a laser beam or the like through a window in the container lid to remove extremely small amounts. The plate spring 10 that supports the vibrator body 7, which increases the vibration frequency to match the specified value, is made of phosphor bronze.
Easily formed from a flat plate of copper, spring steel, etc. by simple press working.

The spring portion 11 is a flexible portion in parallel and perpendicular directions to the vibration direction of the vibrator body.

As a result, the vibrational coupling between the vibrator body and the closed container can be efficiently dissociated, and the vibration Q value can be maintained extremely high.

When an external shock is applied to the vibrator, the leaf spring bends vertically and horizontally with respect to the vibration direction of the vibrator body, so the tip of this spring part is placed against a sealed container to protect the tip of the vibrator body from destruction. By appropriately designing the spring constant and shape of the leaf spring, and by placing a protrusion 20 by drawing on the inner part of the sealed container lid corresponding to the center of the vibrator body, the vibrator body can be completely completed without being destroyed. The single-pronged vibrator body 7 and the leaf spring 10, which ensure good impact resistance and earthquake resistance, have a planar overlapping part, and this overlapping part is prevented from vibrating by the Z-bending part 12 of the leaf spring shown in FIG. Prevent contact with offspring.

This structure ensures sufficient space around the vibrator body,
This has the advantage that the airtight container can be made extremely compact without any loss in the function of the leaf spring.

The plate spring to which the vibrator body is attached is attached to the airtight container to the metal frame 14 of the airtight terminal, which is fixed in advance to the airtight container with brazing material, organic adhesive, or the like to maintain airtightness.

This allows for changes in the environmental pressure in which the vibrator is placed.
Even if the airtight container is slightly deformed, the vibration period of the vibrator is not affected.

The connection between the electrode 9 formed on the surface of the vibrator body and the lead wire 15 of the airtight terminal on the electric circuit is achieved by: - a lead foil 16 formed into a planar shape from a flat flexible material; Alternatively, it may be fixed with an organic adhesive or the like to dissociate the vibrational bond from the vibrator body.

As described above, the vibrator, which is supported and fixed by a flexible leaf spring and connected to an electric circuit, is pressure-welded to the flange portions 18 and 22 of the closed container 17 and the lid 19.

The airtight container and lid have a thin oval-like flat shape,
Easily formed from a flat plate by press working.

The pressed container lid has a hole 23 in a plane portion corresponding to the tip of the tuning fork of the vibrator body.

The hole is closed with a light transmitting member 21 such as glass 9 using a brazing material, an organic adhesive, or the like to maintain airtightness.

Attaching the light transmitting member to the hole provided in the container lid is the fifth step.
As shown in the figure, Au is deposited in advance in a ring shape on the outer periphery 24 of the light transmitting member to ensure good adhesion with the brazing material, etc., and is carried out in a simple operation 5.

Furthermore, as shown in FIG. 6, it is also possible to compression-seal the light transmitting member 27 to the metal frame 26 and fixing it to the container lid 25 with a brazing material, an organic adhesive, or the like.

As shown in FIG. 7, it is also possible to form a constricted protruding ring 29 on the container lid 28 in advance by press working, and then seal a member 30 such as glass directly to the protruding ring.

A container 17 with a container lid 19 and a vibrator body attached as shown in FIG.
and are joined at the outer periphery flange portions 18 and 22.

Frequency adjustment of the vibrator is carried out after the container and lid are bonded under vacuum, and the heavy object added to the tip of the vibrator body is removed using a laser beam through a window made of a light-transmitting member provided in the lid of the container. be exposed.

As a result, the frequency fluctuation characteristics caused by fixing and sealing each vibrator component in the sealed container are completely eliminated, making it possible to dramatically improve the time standard accuracy of the quartz crystal vibrator.

The hermetically sealed container for the crystal resonator of the present invention eliminates the performance deterioration caused by the miniaturization of the resonator, has earthquake resistance and can maintain an extremely high Q value by supporting the resonator with a shuntable leaf spring, and furthermore, it is possible to maintain high Q-value from outside the case. Depending on the method of adjustment, the overall quality of the transducer can be significantly improved.

The present invention is applicable not only to crystal oscillators for watches but also to crystal oscillators for general use.

; The present invention shall also include the following structures within the scope of claims.

■ In a crystal oscillator in which the oscillator body is attached to a metal flat sealed container by a leaf spring that is flexible in the vibration direction of the oscillator body and in a direction perpendicular to the vibration direction, a portion of the container corresponding to the tip of the oscillator body A sealed container 2 for a crystal resonator, characterized in that a metal bushing to which a light transmitting member such as glass is sealed in advance is attached. In a crystal resonator whose body is attached to a metal flat sealed container, a protruding retang is formed in a portion of the container corresponding to the tip of the resonator body, and a light transmitting member such as glass is sealed to the ring. A sealed container for a crystal resonator, characterized by comprising:

3. In a crystal resonator in which the vibrator body is attached to a metal flat sealed container by means of a flexible leaf spring in the vibration direction of the vibrator body and in a direction perpendicular to the vibrating direction of the vibrator body, the container is connected to the flat metal container and the plate-shaped container. 1. A sealed container for a crystal resonator, comprising a lid made of a light-transmitting member, and the two are joined by a brazing material or an organic adhesive.

[Brief explanation of drawings]

Figure 1 is an overview of a conventional crystal resonator using a hanging wire. FIG. 2 is an overview of a conventional crystal resonator in which the resonator is directly fixed to a sealed container. FIG. 3 is a plan view of a crystal resonator according to an embodiment of the present invention. Figure 4 is a cross-sectional view. FIG. 5 is an overview of the light transmitting member. 6 and 7 are partial cross-sectional views of a container according to an embodiment of the present invention. Name of drawing number 1, 5, 7...Crystal resonator body, 8...Additional mass, 9...Electrode, 10
...Plate spring, 11...Plate spring flexible part,
13... Airtight terminal, 16... Lead foil, 17... Sealed container, 19... Sealed container lid, 21, 27, 30... ...Light-transmitting member.

Claims (1)

[Scope of Claims] 1. A sealed container for a crystal resonator comprising a tuning fork type crystal resonator piece enclosed in a metal flat airtight container consisting of an upper capsule and a lower capsule, in which the lower capsule contains the tuning fork type crystal vibrator. An airtight sealing portion is provided in which a lead wire for drawing out the electrode of the child piece is placed. A plate spring for supporting the tuning fork type crystal resonator is fixed to the airtight sealing portion, and the plate springs include two U-shaped plate springs extending from the airtight sealing in the longitudinal direction of the tuning fork type crystal resonator. The base of the tuning-fork type vibrator piece is fixed to the tip of the elastic arm part, and the U-shaped elastic arm part extends in the thickness direction of the tuning-fork type vibrator piece. an elastic part protruding between the tuning fork type crystal resonator piece and the lower capsule; and an elastic part protruding between the crystal resonator piece and the metal flat sealed container in the width direction of the tuning fork type crystal resonator. and the upper capsule is provided with a protrusion for preventing damage to the vibrator at a position substantially facing the root of the fork of the tuning fork-shaped crystal vibrator piece, and the upper capsule is provided with a protrusion for preventing damage to the vibrator, and the U-shaped elastic arm portion is A crystal vibrator characterized in that a part or the root of the tuning fork type crystal resonator piece is in contact with the metal container, and a prong tip of the tuning fork type crystal resonator piece does not come into contact with the metal container. child's airtight container.