JP3319986B2 - Oscillator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an oscillator such as a crystal oscillator.

[0002]

2. Description of the Related Art Conventionally, there is an oscillator that oscillates using a natural oscillation frequency of a vibrator, and a crystal oscillator using crystal as the vibrator is known. In general, the oscillation frequency of a vibrator has a temperature dependency, so that when the temperature changes, the oscillation frequency also changes. Therefore, there is an oscillator that stabilizes the oscillation frequency by eliminating the influence of temperature by housing the oscillator in a thermostat.

As shown in FIG. 5 (a), this type of oscillator has a substantially disc-shaped crystal oscillator 1 supported by a support wire 2a, which is housed in a thermostat 3. The thermostat 3 in which the quartz oscillator 1 is housed resonates (excitations) the quartz oscillator 1.
Resonant circuit for extracting oscillation signal (not shown)
And a temperature control circuit (not shown) for controlling the internal temperature of the thermostat 3 are mounted on the substrate 4, and these are integrally housed in a case 5 and protected. Further, as shown in FIG. 2B, the support wire 2a has a substantially circular cross-sectional shape, and a plurality of the support wires 2a are arranged in pairs along the vibrating surface of the crystal unit 1, and the crystal unit 1 It is supported so as to be sandwiched from both sides.

Here, the above-described resonance circuit resonates the quartz oscillator 1 supported by the support wire 2a, generates a reference signal having a frequency corresponding to the natural signal frequency, and further multiplies / amplifies the reference signal. Then, an oscillation signal of a predetermined frequency is output. At this time, since the environmental temperature of the crystal unit 1 is kept constant by the constant temperature bath 3, the crystal unit 1 is not affected by the change of the ambient temperature of the oscillator. Vibrates at a frequency. Therefore, an oscillation signal obtained by this oscillator has an oscillation frequency that is extremely stable with respect to a temperature change.

[0005]

By the way, the above-mentioned oscillator is mounted on a helicopter, etc.
Receives vibration from a helicopter as an external force, the crystal unit 1 generates a vibration frequency according to its mass, shape, and the like (hereinafter, referred to as a “natural frequency”) in addition to the vibration mode associated with the original oscillation operation. Vibrates at At this time, when the frequency of the vibration received as an external force from the helicopter resonates with the above-described natural frequency of the crystal resonator 1, the amplitude of the vibration of the crystal resonator 1 caused by the external force increases, and as a result, the oscillation signal becomes Undesired frequency spurs occur.

Hereinafter, the vibration of the crystal unit 1 caused by the external force will be described in more detail. Crystal unit 1
When subjected to an external force such as vibration or impact, it vibrates mechanically at its natural frequency, and this vibration can be considered by being decomposed into components in each axial direction of a three-dimensional coordinate system. Hereinafter, as the three-dimensional coordinate system, as shown in FIG. 5A, the arrangement direction of the support lines 2a arranged along the vibration surface of the crystal unit 1 is defined as the x-axis direction, and the vibration of the crystal unit 1 The description will be made assuming a coordinate system in which the direction perpendicular to the surface is the y-axis direction and the longitudinal direction of the support member 2a is the z-axis direction.

Now, in the front view of FIG. 5 (b), when the quartz oscillator 1 is vibrated in the x-axis direction by receiving an external force, a compressive load and a tensile load due to the vibration are reduced.
Right and left support members 2a arranged along the vibration surface of
Occur alternately in each of. As a result, the amplitude in the x-axis direction is limited. However, in this case, a part of the vibration acts on the support line 2a as a bending moment, but most of the vibration is applied as a compressive load and a tensile load to the support line 2a.
Since it acts in the longitudinal direction of a, no large bending moment is generated by this vibration.

When the quartz oscillator 1 vibrates in the z-axis direction, the compression load and the tensile load due to the vibration are:
It is applied alternately in the longitudinal direction of each support member 2a. As a result,
The amplitude in the z-axis direction is likewise limited. In this case, since the above-mentioned compressive load and tensile load act only in the longitudinal direction of the support wire 2a, no bending moment is generated in the support wire 2a.

As described above, in the above-described three-dimensional coordinate system, the amplitudes of the vibrations in the two directions of the x-axis direction and the z-axis direction are effectively limited without generating a large bending moment on the support line 2a. . Therefore, even if the rigidity of the support wire 2a is low, the amplitudes in the x-axis direction and the z-axis direction are limited.

However, in the top view of FIG. 5B, when the quartz oscillator 1 vibrates in the y-axis direction, a compressive load and a tensile load are generated on the support wire 2a.
Since a large bending moment is generated on the support line 2a, the support line 2a is easily deformed in the y-axis direction. Therefore, y
The axial amplitude is hardly limited.

As described above, in the conventional oscillator, since the amplitude of the vibration in the y-axis direction is not effectively limited due to its structure, if the vibration applied to the crystal unit 1 as an external force resonates with the vibration in the y-axis direction. However, the amplitude of this vibration increases, and spurious of unnecessary frequency occurs due to external force.

The present invention has been made in view of such a problem, and an oscillator capable of effectively suppressing vibration of a vibrator due to an external force and reducing spurious of unnecessary frequency appearing in an oscillation signal. The task is to provide.

[0013]

Means for Solving the Problems The present invention has the following arrangement to achieve the above object. That is, the present invention provides a vibrator formed in a substantially disk shape having a specific vibration frequency, and a vibrator for vibrating the vibrator so as to support both ends of the vibrator on both sides. An oscillator that has a plurality of supporting members arranged in pairs along the surface and oscillates by exciting the vibrator, wherein the supporting members are orthogonal to the longitudinal direction of the supporting members. and maximum geometrical moment of inertia with respect to an axis extends parallel with the plane of vibration of the life-and-death the transducer, substantially H
It has a cross-sectional shape formed in the shape of a letter, and a pair of parallel
Make sure that the structural part is parallel to the vibrating surface of the vibrator.
In addition, it is characterized in that it is disposed to face the vibrator . In addition, it is formed in a substantially disk shape having a unique vibration frequency.
Vibrator and both ends of the vibrator sandwiched on both sides
Pair along the vibrating surface of the vibrator to support
Having a plurality of support members arranged in opposite directions to excite the vibrator.
In an oscillator that oscillates by causing the
Perpendicular to the longitudinal direction of the holding member and flush with the vibrating surface of the vibrator.
Maximize the moment of inertia of area with respect to the axis forming the line,
It has a substantially I-shaped cross-sectional shape, and a pair of parallel
-Shaped structural part is parallel to the vibrating surface of the vibrator.
As described above, the vibrator is opposed to the vibrator.
And In addition, it has a substantially disk shape with a unique vibration frequency.
The formed vibrator and both ends of the vibrator are
A pair is formed along the vibrating surface of the vibrator so as to support it
A plurality of support members arranged opposite to each other,
An oscillator that excites and oscillates the support member,
Is perpendicular to the longitudinal direction of the support member and the vibration of the vibrator.
Maximal moment of inertia of area about axis parallel to moving surface
Having a substantially T-shaped cross-sectional shape.
The pair of parallel structural parts are flat against the vibrating surface of the vibrator.
So that they are opposed to each other with the vibrator
And features.

[0014]

[0015]

[0016]

[0017]

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An oscillator according to an embodiment of the present invention, which will be described below, has a structure in which a large bending moment is not generated in the arrangement direction of a support line for supporting a vibrator as described above. Focusing on, by maximizing the second moment of area with respect to an axis perpendicular to the longitudinal direction of the support line and parallel to the vibrating surface of the crystal unit, the rigidity of the support line is improved, and the crystal that causes spurious This limits the vibration amplitude of the vibrator. In the description, the three-dimensional coordinate system assumed in the above description of the related art is similarly assumed, and elements common to the drawings are denoted by the same reference numerals, and description thereof is omitted.

Embodiment 1 First, a first embodiment of the present invention will be described with reference to FIG. As shown in FIG. 5A, the oscillator according to the first embodiment is different from the conventional oscillator shown in FIG. 5 in that the supporting line 2a has a substantially H-shaped cross section instead of the supporting line 2a. 2A.
As shown in FIG. 1B, a plurality of the support wires 2A are arranged along the vibrating surface so as to support the crystal unit 1 from both sides thereof, and furthermore, a pair of parallel structural portions 20A. Are arranged so as to be parallel to the vibrating surface of the crystal unit 1 with the crystal unit 1 interposed therebetween.

The support line 2A having a substantially H-shaped cross section arranged in this manner is an axis orthogonal to the longitudinal direction and parallel to the vibration surface of the crystal unit 1, that is, an axis parallel to the x-axis (hereinafter, referred to as an axis).
The second moment of area is maximized with respect to the “main axis”. As a result, the rigidity of the support wire 2A in the y-axis direction is increased, and even if a large bending moment is generated by a force from this direction, the support wire 2A is not easily deformed. Therefore, the amplitude in the y-axis direction, which causes the above-mentioned spurious, is effectively suppressed.

However, an axis perpendicular to the vibrating surface of the crystal unit 1, that is, an axis parallel to the y-axis (hereinafter referred to as "sub-axis")
) Is minimized, so that if the cross-sectional area is constant, the rigidity in the x-axis direction will be reduced. However, as described above, a large bending moment does not act on the support wire 2A depending on the vibration in the x-axis direction. Therefore, even if the rigidity in the x-axis direction is reduced, the x-axis is compressed by the above-described compression load and tensile load. The amplitude in the direction is effectively limited. In the z-axis direction, the amplitude is limited as in the above-described conventional example.

Therefore, according to the support line 2A of the present embodiment, the amplitude of the vibration generated in the crystal unit 1 due to the external force is limited in any of the above-described three-dimensional coordinate axis systems. Even if the vibration of the crystal unit 1 and the vibration of the external force resonate, spurious at unnecessary frequencies can be effectively suppressed.

As described above, the oscillator according to the present embodiment focuses on the fact that the vibration in the x-axis direction does not cause a large bending moment on the support line 2A, and the rigidity of the support line can be reduced in this direction. It is a thing that actively uses what is done. That is, the sectional shape of the support wire 2A is substantially H
The shape of the letter allows the moment of inertia of area to the countershaft to be minimized, and the moment of inertia to the main axis to be maximal. This effectively suppresses the vibration in the y-axis direction.

In the present embodiment, the cross-sectional shape and the arrangement of the support line 2A are determined so as to suppress the vibration in the y-axis direction. The original vibration of the crystal unit 1 is also suppressed and Q
The value decreases. For this reason, it is necessary to suppress the vibration in the y-axis direction within a range where the Q value required for the oscillation operation can be obtained.

Embodiment 2 Next, a second embodiment of the present invention will be described with reference to FIG. As shown in FIG. 2A, the oscillator according to the second embodiment is different from the oscillator according to the first embodiment in that the supporting wire having a substantially I-shaped cross section is used instead of the support wire 2A. Line 2B is provided to maximize the moment of inertia relative to the main axis.

That is, as shown in FIG. 2B, the supporting wires 2B are opposed to each other across the crystal resonator 1 such that the longitudinal direction of the cross section is perpendicular to the vibration surface of the resonator 1. In addition, a plurality of quartz oscillators 1 are arranged along the vibrating surface so as to support the quartz oscillator 1 at both side ends thereof, sandwiching the quartz oscillator 1 from both sides.

When the cross section of the support wire is substantially I-shaped, the second moment of area with respect to the main shaft is larger than that of the first embodiment in which the support wire is substantially H-shaped.
Axial stiffness is further improved. Therefore, vibration in the y-axis direction, which causes spurious, can be more effectively suppressed.

Embodiment 3 Next, a third embodiment of the present invention will be described with reference to FIG. As shown in FIG. 5A, the oscillator according to the third embodiment has the same structure as that of the oscillator according to the first embodiment, except that the support wire 2A is replaced by a support having a substantially T-shaped cross section. A line 2C is provided to maximize the moment of inertia with respect to the main axis.

That is, as shown in FIG. 1B, a plurality of support lines 2C are arranged along the vibrating surface so as to support the crystal unit 1 from both sides thereof. Are arranged to face each other so as to form a substantially I-shape.

When the cross section of the support wire is substantially T-shaped as described above, the second moment of area with respect to the main shaft is larger than that of the first embodiment in which the support wire is substantially H-shaped.
Axial stiffness is further improved. Further, since the second moment of area with respect to the sub-axis becomes larger than that in the case of the substantially I-shape, the rigidity in the x-axis direction can be increased. Accordingly, vibration in the y-axis direction, which is a main cause of spurious components, is effectively suppressed, and vibration in the x-axis direction is also stably suppressed.

Embodiment 4 FIG. Next, a fourth embodiment of the present invention will be described with reference to FIG. As shown in FIG. 7A, the oscillator according to the fourth embodiment is different from the oscillator according to the first embodiment in that the support wire having the substantially U-shaped cross section is used instead of the support wire 2A. A line 2D is provided to maximize the moment of inertia with respect to the main axis.

That is, as shown in FIG. 2B, a plurality of support lines 2D are arranged along the vibrating surface so as to support the crystal unit 1 from both sides thereof, and furthermore, the openings thereof are formed. The quartz oscillator 1 is disposed so as to face the oscillation surface.

When the cross section of the support wire is substantially U-shaped, the second moment of area with respect to the main shaft is larger than that of the first embodiment in which the support wire is substantially H-shaped. The stiffness in the direction is further improved. Further, compared with the above-described second or third embodiment having a substantially I-shape or a substantially T-shape, the second moment of area with respect to the sub shaft is increased, so that the rigidity in the x-axis direction can be increased. Therefore, vibration in the y-axis direction, which is a main cause of spurious, is suppressed, and vibration in the x-axis direction is also stably suppressed.

Although the first to fourth embodiments of the present invention have been described above, the crystal resonator 1 may be supported by combining the support wires 2A to 2D in each embodiment. In addition, as a cross-sectional shape of a support line for supporting the crystal unit 1,
The present invention is not limited to the above embodiments, and other shapes such as a substantially L-shape and a substantially U-shape may be used.

[0035]

As is clear from the above description, according to the present invention, the following effects can be obtained. That is,
According to the present invention, since the cross-sectional shape of the support member that supports the vibrator is determined according to the vibration direction of the vibrator that causes spurious, the rigidity of the support member is improved without increasing the size of the support member. The vibration of the vibrator caused by the external force can be suppressed. Therefore, spurious of unnecessary frequency due to external force can be effectively reduced without increasing the size and weight of the oscillator or increasing the cost.

Also, since the cross-sectional shape of the support member is substantially H-shaped, it is possible to improve the rigidity of the support member in the vibration direction of the vibrator which causes spurious and to secure the rigidity in other directions. it can.

Further, since the cross-sectional shape of the support member is substantially I-shaped, the rigidity of the support member in the vibration direction of the vibrator which causes spurious is further improved as compared with the case of substantially H-shaped. be able to. In addition, since the cross-sectional shape is simplified, the support member can be easily processed.

Further, since the cross-sectional shape of the support member is substantially T-shaped, the rigidity of the vibrator which causes spurious vibrations in the vibration direction is improved. Rigidity in the direction can be improved. Further, since the cross-sectional shape is simplified as compared with the case where the shape is substantially H-shaped, the support member can be easily processed.

[0039]

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a configuration of an oscillator according to a first embodiment of the present invention.

FIG. 2 is a diagram illustrating a configuration of an oscillator according to a second embodiment of the present invention.

FIG. 3 is a diagram illustrating a configuration of an oscillator according to a third embodiment of the present invention.

FIG. 4 is a diagram illustrating a configuration of an oscillator according to a fourth embodiment of the present invention.

FIG. 5 is a diagram showing a configuration of a conventional oscillator.

[Explanation of symbols]

1 crystal oscillator, 2A-2D support wire, 3 constant temperature bath, 4
Substrate, 5 cases, 20A Structure of supporting wire.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H03B 5/32 H03H 9/00-9/215

Claims (3)

(57) [Claims] 1. A substantially disk shape having a specific vibration frequency
And a pair formed along the vibrating surface of the vibrator so as to support both ends of the vibrator on both sides .
An oscillator having a plurality of support members disposed opposite to each other and oscillating by exciting the vibrator, wherein the support member is orthogonal to a longitudinal direction of the support member and parallel to a vibration surface of the vibrator. It has a substantially H-shaped cross-sectional shape that maximizes the second moment of area with respect to the axis, and the pair of parallel structural parts is the vibration of the vibrator.
Opposite across the vibrator so that it is parallel to the plane
An oscillator, wherein the oscillator is arranged . (2)Substantial disk shape with unique vibration frequency
The vibrator thus formed and both ends of the vibrator are sandwiched on both sides.
Pairs along the vibrating surface of the vibrator to support
And a plurality of support members arranged facing each other.
In an oscillator that oscillates when excited, The support member is perpendicular to the longitudinal direction of the support member and
The secondary mode in the axis parallel to the vibrating plane of the vibrator
The cross-sectional shape formed in a substantially I-shape that maximizes the
Having a pair of parallel structural parts,
Opposite across the vibrator so that it is parallel to the plane
Placed An oscillator characterized in that: (3)Substantial disk shape with unique vibration frequency
The vibrator thus formed and both ends of the vibrator are sandwiched on both sides.
Pairs along the vibrating surface of the vibrator to support
And a plurality of support members arranged facing each other.
In an oscillator that oscillates when excited, The support member is perpendicular to the longitudinal direction of the support member and
The secondary mode in the axis parallel to the vibrating plane of the vibrator
The cross-sectional shape formed in a substantially T-shape that maximizes the
Having a pair of parallel structural parts,
Opposite across the vibrator so that it is parallel to the plane
Placed An oscillator characterized in that: