JP3881670B2 - Vibration detection structure - Google Patents

Description

  The present invention relates to a thin vibration detection structure that can be used for a sensor that detects vibrations of vertical movement and measures the number of steps, a switch that performs ON-OFF switching, and the like.

As a thin vibration detection sensor, the present applicant has already proposed a thin pedometer in the invention of a card type pedometer disclosed in Japanese Patent Laid-Open No. 15-308511 and a portable body fat meter disclosed in Japanese Patent Laid-Open No. 15-305018. .
In other words, this step number detector is incorporated into the built-in window via a cushioning material composed of a pair of cushioning sheets and a ring-shaped cushioning sheet.
The step detector has a thin circular piezoelectric plate, and a support pin in the thickness direction of the substrate frame is fixed to the center of the piezoelectric plate, and the support pin can freely rotate around the support pin. An eccentric weight is supported.
Since the eccentric weight has a center of gravity G at a position eccentric from the support pin, the eccentric weight places the center of gravity G directly below the support pin regardless of the orientation of the substrate frame in a substantially vertical plane. Maintain a constant posture.
Further, a fulcrum shaft is planted on one side of the eccentric weight, and a base portion of the acceleration swing member is pivotally supported on the fulcrum shaft, and an intermediate portion of the acceleration swing member having a center of gravity on the right side of the support pin. The engagement hole is loosely fitted to the support pin.
Between the eccentric weight and the acceleration oscillating member, a whisker spring that urges the acceleration oscillating member counterclockwise around the fulcrum shaft against gravity is applied.
Therefore, when vertical acceleration is applied to the substrate frame, a rotational moment with the fulcrum shaft as a fulcrum is applied to the acceleration swing member, and the acceleration swing member swings against the force of the whisker spring.
As the acceleration swing member swings, the engagement hole of the acceleration swing member abuts on the support pin, and the abutment force is transmitted to the piezoelectric plate supporting the support pin. Electromotive force is generated and the number of steps is detected. The above configuration has achieved a reasonable result, but the impact force of the engagement hole of the acceleration rocking member is applied to the support pin, which is transmitted to the piezoelectric plate. Due to the configuration, impact force is repeatedly applied to the support pin, and it is necessary to reinforce the joint portion between the support pin and the piezoelectric plate.
Japanese Patent Laid-Open No. 15-308511 See FIG. Japanese Patent Laid-Open No. 15-305018 See FIG.

  The present invention was devised in view of the above circumstances, and provides a vibration detection structure that can be used for a pedometer sensor and various switches that are thin, highly accurate, and excellent in durability. is there.

In order to solve the above-mentioned problems, the present invention provides
A conductive support pin disposed in the center and connected to one polarity;
An annular contact member formed in a concentric large-diameter ring shape around the support pin and connected to the other polarity;
A first rocking member that is rotatably supported by fitting a rotation hole to the support pin;
A pivot to be eccentric pivot point provided at a position shifted from the support pin by the first swinging member,
An opening formed of a substantially arc-shaped slit that is bent stepwise between the pivot and the rotation hole to increase the thickness;
It is made of a metal plate having an arm portion, and is disposed inside the first swinging member. The arm portion extends on the first swinging member through the opening and pivots on a pivot that serves as the eccentric pivot point. A second oscillating member having electrical conductivity to be worn ;
A hole formed in the second rocking member, which is set to have a diameter larger than that of the support pin and is externally fitted to the support pin, and the second rocking member is set to a predetermined point with the eccentric pivot point as a fulcrum. An operating hole formed so that the inner periphery can contact the support pin when pivoting
A position that is integrally formed in the center of gravity direction at an intermediate position on the outer periphery of the second swing member, and that contacts the annular contact member when the second swing member pivots about the eccentric pivot point; A contact that can pivot to a spaced apart position that does not contact; and
It is spanned between the first rocking member and the second rocking member and biases the second rocking member with respect to the first rocking member in a direction separating the protrusion from the annular contact member. provided a biasing means comprising a beard spring so are balanced in a state,
When a predetermined external force exceeding the biasing force of the biasing means is applied, the contactor is brought into contact with the annular contact member against the biasing force, and the support pin and the annular contact member are brought into contact with each other via the second swinging member. It is characterized by being energized.
This vibration detection structure may be used as a sensor for a pedometer or as a switch.

Since the vibration detection structure of the present invention is thin, it does not require a space even if it is built in various devices, and the first swinging member and the second swinging member are actuated while balancing with the biasing means. Therefore, the detection accuracy can be increased.
Further, since vibration is detected by energization by contact, there is an advantage that it is not necessary to give an impact, and durability and reliability are improved and the structure can be simplified.

  A preferred embodiment of the vibration detection structure 1 of the present invention will be described below with reference to the drawings.

The vibration detection structure 1 shown in FIG. 1 is disposed on an insulating substrate of a casing C (see FIG. 6) and has conductive support pins 2 connected to one polarity of a power source (not shown). The ring-shaped contact member 3 is formed in a concentric large-diameter ring shape around the support pin 2 and connected to the other polarity of the power source.
A first swinging member 10 is pivotally supported (P1) on the support pin 2 so as to be rotatable.
A conductive second swing member 20 is pivotally attached to the first swing member 10 at an eccentric pivot point P2 at a position displaced from the support pin 2.

[First swing member]
As clearly shown in FIG. 4, the first swing member 10 is made of a substantially fan-shaped metal plate, and a rotation hole portion 11 that is rotatable by being fitted to the support pin 2 at the central corner is formed. The boss 11a protrudes along the hole.
Further, a pivot 12 is projected from the outer side away from the rotation hole 11.
The pivot 12 is provided at a position eccentric from the support pin 2 serving as the rotation center, and becomes an eccentric pivot point P2 described later.
An opening 13 made of a substantially arc-shaped slit is formed between the rotation hole 11 and the pivot 12.
In this embodiment, the opening 13 is bent in a stepped manner to increase the thickness of the opening 13.
Reference numeral 15 denotes a first hook portion that is provided at an end portion of the first swinging member 10 and is used to hook one end of a whisker spring 30 shown as an example of an urging means.

[Second swing member]
Next, in the case of the present embodiment, the second swing member 20 has a structure in which a metal plate is bent twice to give a thickness as shown in FIG. An arm portion 23 is provided with an operating hole 21 to be fitted outside, and is formed as a single plate that does not overlap with each other, extends outward, and has a hole 22 that is pivotally attached to the pivot 12 at the tip. And are provided.
The arm portion 23 extends through the opening 13 onto the first swing member 10 and is pivotally mounted by fitting a hole 22 to the pivot shaft 12. The pivot position is eccentric. It becomes a pivot point P2.
At this time, since the opening 13 is also opened in the thickness direction, the movement of the arm 23 is not restricted by the edge of the opening 13 or the first swing member 10.

[Working hole]
Next, the operating hole 21 has a substantially bowl shape in which one side of a circle is cut out linearly, and is set to have a diameter larger than that of the support pin 2 and is formed in the boss 11a of the rotation hole 11. In short, the shape may be a shape that restricts the swing range of the second swing member 20 that pivots about the eccentric pivot point P2, and may be a long hole.
The second swinging member 20 can be freely displaced within a range in which the inner periphery of the operation hole 21 abuts the boss 11a of the rotation hole 11.

[Contact]
Since the second rocking member 20 is provided with a protrusion 24 serving as a contact at a midway position on the outer periphery thereof, the second rocking member 20 pivots with the eccentric pivot point P2 as a fulcrum. And the said protrusion 24 can be displaced to the position which contacts the said cyclic | annular contact member, and the separated position which leaves | separates without contacting.
In the illustrated example, the contact is made of a convex piece, but the shape is not particularly limited, and may be a curved edge or the like as long as it is in contact with the annular contact member 3.
Reference numeral 25 denotes a second hook that is provided at the end of the second swinging member 20 and that hooks the other end of the whisker spring 30.

[Energizing means]
In this embodiment, a whisker spring 30 is used as an example of the urging means, and between the first hook portion 15 of the first swing member 10 and the second hook portion 25 of the second swing member 20. It is being handed over.
The elastic force of the whisker spring 30 urges the protrusion 24 in a direction away from the annular contact member 3. When an external force exceeding a predetermined value is applied, the second swing member 20 resists the urging force. Is set so that the protrusion 24 is brought into contact with the annular contact member 3.
Therefore, the magnitude of the external force that can be detected can be changed by changing the elastic force of the whisker spring 30.

In FIG. 1, the first rocking member 10 and the second rocking member 20 are attached to the support pin 2, and the first rocking member 10 and the second rocking member 20 are pivotally mounted at an eccentric pivot point P2. The state which spanned and attached the beard spring 30 is shown.
Thereby, the first rocking member 10 and the second rocking member 20 are balanced by the whisker spring 30.
Since the structure is as described above, the first rocking member 10 and the second rocking member 20 can freely move around the support pin 2 regardless of the posture of the casing C in a substantially vertical plane. Since it can rotate, it can always take a detection stand-by posture with the center of gravity positioned downward (see FIG. 2).

When acceleration in the vertical direction is applied to the casing 1, the first swing member 10 is swung due to a rotational moment with the support pin 2 as a fulcrum, and at the same time resists the biasing force of the whisker spring 30. 2 The rocking member 20 is also displaced.
When a force exceeding a predetermined value is applied, the displacement of the second rocking member 20 increases, and as shown in FIG. 3, the second oscillating member 20 is displaced to a position where the boss 11a of the rotation hole 11 abuts with the upper end of the operation hole 21. The protrusion 24 contacts the annular contact member 3.

As a result, the support pin 2 connected to one polarity of the power source and the annular contact member 3 connected to the other polarity are connected (closed) via the second oscillating member 20, so that energization is performed. Done.
When the external force is weakened, the second swinging member 20 returns to the posture shown in FIG. 1 due to the repulsive force of the whisker spring 30, and the protrusion 24 is separated from the annular contact member 3. Since it opens, electricity is not performed.
The number of steps as a pedometer can be detected using the presence / absence of energization.
Moreover, it can be used as a switch using ON-OFF by opening and closing.

In the above embodiment, the protrusion 24 is provided in the center of gravity direction of the second rocking member 20 so that the protrusion is directed in the vertical direction. For example, a weight is provided in the vicinity of the protrusion 24 so that the protrusion 24 is provided. The posture may be controlled so that is oriented in the vertical posture.
The biasing means may use a spring or a spring other than the beard spring.
In other words, it goes without saying that various design changes can be made without departing from the scope of the present invention.

It is a front view which shows the detection stand-by attitude | position of a vibration detection structure. It is a figure explaining that a vertical attitude | position can be taken at the time of rotation, (a) is an arbitrary position, (b) is a figure which shows the state displaced to the vertical position. It is a front view of the vibration detection structure which shows the state which detected the external force. (A) is a front view of a 1st rocking | swiveling member, (b) is a top view. (A) is a front view of a 2nd rocking | swiveling member, (b) is a top view. (A) is a front view of a casing, (b) is sectional drawing which shows an internal structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vibration detection structure 2 Support pin 3 Ring contact member 10 1st rocking | fluctuation member 11 Rotating hole 11a Boss 12 Pivot 13 Opening part 15 Hook part 20 Second rocking member 21 Actuation hole 22 Hole 23 Arm part 24 Projection part 25 2nd hook part 30 Beard spring P1 Rotation center P2 Eccentric pivot point

Claims (3)

A conductive support pin disposed in the center and connected to one polarity;
An annular contact member formed in a concentric large-diameter ring shape around the support pin and connected to the other polarity;
A first rocking member that is rotatably supported by fitting a rotation hole to the support pin;
A pivot to be eccentric pivot point provided at a position shifted from the support pin by the first swinging member,
An opening formed of a substantially arc-shaped slit which is bent stepwise between the pivot and the rotation hole to increase the thickness;
It is made of a metal plate having an arm portion, and is disposed inside the first swing member. The arm portion extends on the first swing member through the opening and pivots on a pivot that serves as the eccentric pivot point. A second swinging member having electrical conductivity to be worn ;
A hole formed in the second rocking member, which is set to have a diameter larger than that of the support pin and is externally fitted to the support pin, and the second rocking member is set to a predetermined point with the eccentric pivot point as a fulcrum. An operating hole formed so that an inner circumference can contact the support pin when pivoting in the range of
A position that is integrally formed in the center of gravity direction at an intermediate position on the outer periphery of the second swing member, and that contacts the annular contact member when the second swing member pivots about the eccentric pivot point; A contact that can pivot to a spaced apart position that does not contact; and
It is spanned between the first rocking member and the second rocking member and biases the second rocking member with respect to the first rocking member in a direction separating the protrusion from the annular contact member. provided a biasing means comprising a beard spring so are balanced in a state,
When a predetermined external force exceeding the urging force of the urging means is applied, the contactor is brought into contact with the annular contact member against the urging force, and the support pin and the annular contact member are brought into contact with each other via the second swing member. Vibration detection structure characterized by energization.   The vibration detection structure according to claim 1, wherein the vibration detection structure is a pedometer sensor.   The vibration detection structure according to claim 1, wherein the vibration detection structure is a switch.

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