JP4807110B2 - Support structure for accelerometer physical pendulum and accelerometer - Google Patents

Description

  The present invention relates to a support structure for a physical pendulum in an accelerometer and an accelerometer, and more particularly to a support structure for a physical pendulum capable of increasing detection accuracy in an accelerometer using a laser interferometer.

  FIG. 7 shows the configuration of an accelerometer using a conventional laser interferometer (see Non-Patent Document 1). The direction of acceleration is the Z axis, the direction orthogonal to the Z axis is the X axis, and the direction orthogonal to the Z axis and the X axis is the Y axis. This accelerometer 101 detects acceleration of shaking such as an earthquake, for example. A support column 103 is erected on a base 102 attached to a measurement object, and a physical pendulum 111 is provided on a vertical portion 103 a of the support column 103. It is connected so as to be orthogonal to the vertical portion 103a so that the pendulum can move according to the acceleration.

  The physical pendulum 111 has a configuration in which a weight 113 is fixed to one end of a plate-like support portion 112, and the other end of the support portion 112 is fixedly connected to the vertical portion 103 a of the column 103 via a thin metal plate 104. . In addition, spring members 105 for urging the physical pendulum 111 toward the support column 103 to increase the period of the pendulum motion of the physical pendulum 111 are disposed on the left and right sides of the support portion 112 of the physical pendulum 111. ing. In addition, between the upper surface of the support portion 112 of the physical pendulum 111 and the horizontal portion 103 b of the support column 103, the physical pendulum 111 is given a pendulum motion, and elastic means for supporting the physical pendulum 111 vertically to the support column 103. The constant elastic spring 106 is provided.

  Further, a moving mechanism 121 that moves the physical pendulum 111 in a direction that cancels the pendulum motion of the physical pendulum 111 is provided between the top surface of the physical pendulum 111 and the bottom surface of the horizontal portion 103 b of the support column 103. The moving mechanism 121 includes an electromagnet 122 provided on the upper surface of the physical pendulum 111 and a magnet 123 provided at a position facing the electromagnet 122 in the horizontal portion 103b of the support column 103. The moving circuit 121 is transferred from the control circuit 141 to the electromagnet 122. The amount of movement of the physical pendulum 111 is controlled by giving a control signal.

  Further, a laser interferometer 131 that detects the movement position of the physical pendulum 111 according to the acceleration is provided between the physical pendulum 111 and the base 102.

  The control circuit 141 receives the position signal of the physical pendulum 111 measured by the laser interferometer 131, and cancels the pendulum motion of the physical pendulum 111 based on the position signal (no relative movement occurs with respect to the column 103). ) Is transmitted to the electromagnet 122 for performing the moving operation necessary for the above. Based on the control signal output from the control circuit 141, the acceleration applied in the vertical direction of the measurement object is calculated.

In the accelerometer 101 configured in this manner, when the measurement object moves in the vertical direction (Z-axis direction in FIG. 7) and the physical pendulum 111 receives vertical acceleration, the physical pendulum 111 moves in the vertical direction. To do. The movement (displacement) of the physical pendulum 111 is measured by the laser interferometer 131, and a position signal of the measurement result is transmitted to the control circuit 141. The control circuit 141 gives a control signal to the electromagnet 122 so as to cancel the pendulum motion of the physical pendulum 111 based on the position signal. The acceleration applied in the vertical direction of the measurement object is measured by analyzing the control signal at that time.
Earth and Planetary Science Joint Conference 2001 Proceedings Ss-005

  In the configuration of the accelerometer 101 of the above-described prior art, the physical pendulum 111 is fixedly connected to the support column 103 via the metal thin plate 104, and therefore, the pendulum motion of the physical pendulum 111 is easily influenced by the spring property of the metal thin plate 104. Therefore, a thin plate spring 104 is used as the metal thin plate 104 so as not to be affected by the spring property of the metal thin plate. However, when a very thin leaf spring is used, the mechanical strength is insufficient, and the metal thin plate 104 is deformed into an S shape by the tension of the spring member 105, or in the extreme case, buckling occurs. As a result, the positional stability of the physical pendulum 111 is impaired, and as a result, the optical axis of the laser interferometer is greatly out of the allowable range of displacement and the function is impaired.

  In addition, although the spring members 105 for extending the vibration period are provided on the left and right sides of the physical pendulum 111, it is difficult to make the tensions of the respective spring members 105 exactly the same. As a result, twisting motion occurs in the physical pendulum 111. The laser interferometer 131 can detect the motion of the physical pendulum 111 with extremely high accuracy. However, when these torsional motions occur, an error corresponding to the torsional motion is added to the measurement result of the laser interferometer 131, and the acceleration is increased. There was a problem that it could not be detected correctly.

  For this reason, it has been desired to develop a support structure for a physical pendulum capable of measuring acceleration with high accuracy by preventing the torsional motion of the physical pendulum, and an accelerometer using the support structure.

The support structure of a physical pendulum accelerometer according to the present invention is to measure the pendulum motion of pendulum in accordance with the acceleration, the physical pendulum of the support structure of the accelerometer to determine the acceleration on the basis of the measurement result, pendulum physical pendulum together impart kinetic, physical pendulum, a resilient means for supporting vertically the posts erected in the direction of the acceleration, it urges the long period of the cycle of the physical pendulum of the pendulum movement to urge the physical pendulum to the support side The physical pendulum has a configuration in which a wedge part is provided at one end and a weight is fixed at the other end, and the tip of the wedge part is provided on the support column and has an angle larger than the angle of the wedge part. The physical pendulum weight is displaced in the direction of acceleration with the abutting portion as a fulcrum, and the pendulum moves.The urging means has a contact position between the urging means and the column. It is arranged so that it is located behind the contact That.

As described above, according to the present invention, the physical pendulum has a configuration in which a wedge portion is provided at one end and a weight is fixed to the other end, and the tip of the wedge portion is provided on the support column and the wedge portion. The physical pendulum weight is displaced in the direction of acceleration with the abutting portion being in contact with the tip of the V-groove having an angle larger than the angle, and the urging means is the urging means. Since the connection position between the support column and the support column is located on the back side of the contact portion, the torsional motion can be suppressed, and the acceleration applied to the measurement object can be accurately detected.

Embodiment 1 FIG.
FIG. 1 is a diagram showing a support structure for a physical pendulum of an accelerometer according to Embodiment 1 of the present invention. In FIG. 1, the direction of acceleration is the Z axis, the direction orthogonal to the Z axis is the X axis, and the direction orthogonal to the Z axis and the X axis is the Y axis.
The accelerometer 1 detects acceleration of shaking such as an earthquake, for example, and can be displaced in the direction of acceleration by a base 2 attached to a measurement object, a support 3 standing on the support 2, and the support 3. , A movement mechanism 21 for moving the physical pendulum 11 in a direction to cancel the pendulum movement of the physical pendulum 11 based on a control signal from a control circuit 41 described later, and a displacement due to the pendulum movement of the physical pendulum 11 A laser interferometer 31 that outputs a position signal and controls the moving mechanism 21 so as to cancel the pendulum motion of the physical pendulum 11 based on the position signal of the laser interferometer 31, and the physical pendulum based on the control contents 11 and a control circuit 41 that measures the acceleration applied to the motor 11.

  The support column 3 includes a vertical portion 3a that is perpendicular to the base 2 and extends in the acceleration direction, and a horizontal portion 3b that extends parallel to the base 2 from the vertical portion 3a.

  The physical pendulum 11 is composed of a support portion 12 having one end branched in two from the center portion, and a weight 13 fixed to the other end of the support portion 12, and the two branched end portions 12 a Each is fixed to the column 3 via a thin metal plate 14. In addition, a spring member 15 is provided as a biasing means for biasing the physical pendulum 11 toward the column 3 between the column 3 and the central portion between the two end portions 12a. The spring member 15 is provided to increase the period of the pendulum motion of the physical pendulum 11. Further, a constant elastic spring is provided between the upper surface of the support portion 12 of the physical pendulum 11 and the horizontal portion 3 b of the support column 3 to impart a pendulum motion to the physical pendulum 11 and to vertically support the physical pendulum 11 on the support column 3. 16 is provided.

  The laser interferometer 31 is provided between the physical pendulum 11 and the base 2. FIG. 2 shows the configuration of the laser interferometer 31.

FIG. 2 is an explanatory diagram of a laser interferometer.
In this example, the laser interferometer 31 is a Michelson interferometer. The light emitted from the laser generator 32 is divided into two directions by the half mirror 33, one of which is reflected by a reflecting mirror (hereinafter referred to as a movable mirror) 34 provided on the lower surface of the physical pendulum 11, and returns to the half mirror 33. One is reflected by the fixed mirror 35 and returns to the half mirror 33. Then, after the light overlaps, the light travels in the direction of the photodiode 36 and the change in interference is measured by the photodiode 36. At this time, when the physical pendulum 11 vibrates up and down, the distance between the movable mirror 34 and the half mirror 33 changes, so that the optical path length changes and the interference pattern also changes. The displacement of the physical pendulum 11 can be measured by measuring the change in the interference pattern.

  Returning to the description of FIG. In this example, the moving mechanism 21 includes an electromagnet 22 provided on the upper surface of the physical pendulum 11 and a magnet 23 provided at a position facing the electromagnet 22 in the horizontal portion 3 b of the support column 3. A movement amount of the physical pendulum 11 is controlled by a control signal supplied from the circuit 41. The moving mechanism 21 is not limited to the configuration of this example, and may be any mechanism that can move the physical pendulum 11 in the vertical direction by a control signal from the control circuit 41. For example, an electrostatic force is used. It may be.

  The control circuit 41 receives the position signal of the physical pendulum 11 measured by the laser interferometer 31 and cancels the pendulum motion of the physical pendulum 11 based on the position signal (no relative movement occurs with respect to the support column 3). ) Is transmitted to the electromagnet 22 in order to perform a moving operation necessary for the above. Based on the control signal output from the control circuit 41, the acceleration applied in the vertical direction of the measurement object is calculated.

  In the accelerometer 1 configured as described above, when the object to be measured moves in the vertical direction (Z-axis direction in FIG. 1) and the physical pendulum 11 receives vertical acceleration, the physical pendulum 11 performs a pendulum motion in the vertical direction. . The movement (displacement) of the physical pendulum 11 is measured by the laser interferometer 31, and the position signal of the measurement result is transmitted to the control circuit 41. The control circuit 41 moves the pendulum motion of the physical pendulum 11 based on the position signal. A control signal is sent to the electromagnet 22 so as to cancel the signal. The acceleration applied in the vertical direction of the measurement object is measured by analyzing the control signal at that time.

  Here, in the support structure of the physical pendulum 11 of this example, since the single spring member 15 for urging the physical pendulum 11 toward the support column 3 is provided, the spring member is provided on each side of the conventional physical pendulum 11. The occurrence of torsional motion due to variations in tension when 15 is provided can be suppressed. In addition, since the two end portions 12a of the physical pendulum 11 are fixedly connected to the support column 3 via the thin metal plate 14 at two locations, even if a force that causes a torsional motion is applied to the physical pendulum 11, The two thin metal plates 14 have moments opposite to each other, and the torsional motion can be suppressed. Therefore, the measurement result of the laser interferometer 31 does not include the error of the torsional motion of the physical pendulum 11, and the acceleration applied to the measurement object can be accurately detected.

Embodiment 2. FIG.
FIG. 3 is a diagram illustrating a support structure of a physical pendulum of the accelerometer according to the second embodiment. In FIG. 3, the same parts as those of the first embodiment shown in FIG. FIG. 3 shows only the support structure portion of the physical pendulum 11, and other configurations (such as electrical components for measuring acceleration) are the same as those in FIG. 1 and are not shown.

  The support structure 51 for the physical pendulum 11 according to the second embodiment is the same as the support structure for the physical pendulum 11 according to the first embodiment shown in FIG. The support portion 52 is formed in a rectangular shape as a whole, the tip of the support portion 52 is wedge-shaped, and a V-groove 53 is provided in the support column 3 at a connection portion between the physical pendulum 11 and the wedge portion 52a. The angle of the V-groove 53 is formed larger than the angle of the wedge portion 52a, the tip of the wedge portion 52a of the physical pendulum 11 abuts on the tip of the V-groove 53 of the support column 3, and the abutment portion serves as a fulcrum. In addition, the weight 13 of the physical pendulum 11 is displaced in the direction of acceleration so that the pendulum moves.

  Further, in place of the spring member 15 provided between one central portion of the two end portions 12a branched in the physical pendulum 11 of the first embodiment and the column 3, the same function as the spring member 15 is provided. Are provided on both the left and right sides of the physical pendulum 11.

  Here, it is assumed that the material of the wedge portion 52a of the physical pendulum 11 and the V groove 53 of the support column 3 are different from each other. In this example, the physical pendulum 11 is made of a tough steel material, and the V groove 53 of the support column 3 is made of a brittle material sapphire. Used. The reason why different materials are used for the wedge portion 52a of the physical pendulum 11 and the V groove 53 portion of the column 3 will be described below.

  First, paying attention to the contact portion between the wedge portion 52a of the physical pendulum 11 and the V-groove 53 of the support column 3, the contact portion between the wedge portion 52a and the V-groove 53 is not provided with a special lubricating layer. They are in contact with each other in friction. In this case, the wedge part of the physical pendulum 11 is a point where the direction of movement of the physical pendulum 11 is reversed, that is, a point where the physical pendulum 11 moves upward and reaches top dead center and then starts pendulum movement downward. The friction at the contact portion between 52a and the V-groove 53 of the column 3 is switched from dynamic friction to static friction, and the movement speed of the physical pendulum 11 jumps. If the movement speed of the physical pendulum 11 jumps excessively in this way, a discontinuous point is generated in the measurement result of the laser interferometer 31, and an error occurs in the measurement, which affects the accuracy of the detected acceleration. Therefore, the static friction at the contact portion between the wedge portion 52a and the V groove 53 needs to be reduced as much as possible.

  In addition, friction at the abutment part may cause dimensional changes due to wear and damage, eventually causing changes in the trajectory of the pendulum movement, resulting in deviations in the optical axis of the laser beam, and deterioration in acceleration detection accuracy. is expected. Therefore, in this example, since the wedge portion 52a is a tough material (steel) and the V-groove 53 is a brittle material (sapphire), a combination of a tough material and a brittle material, the same kind of material (tough material-tough material or Compared to the case of a brittle material-brittle material), it is possible to prevent dimensional changes due to deformation and wear of the contact portion.

  That is, in the case of the tough materials, the contact portion is likely to be deformed, and in the case of the brittle materials, the wear is likely to occur. On the other hand, it has been confirmed by experiments that when the combination of a tough material and a brittle material is used as in the present example, the deviation of the optical axis of the laser beam is small. Also, in the case of a combination of tough material and brittle material, the wedge portion 52a is somewhat deformed, but the actual deformation amount is extremely small relative to the optical axis accuracy, so deterioration of acceleration detection accuracy is not a problem in practice. .

  In the support structure 51 of the physical pendulum 11 configured as described above, the physical pendulum 11 is directly in contact with the support column 3 without using a metal thin plate or the like, and since the material is steel, the spring member 54 is used. Even if the tension is increased, deformation such as S-shape and buckling does not occur, and the position stability of the physical pendulum 11 can be ensured. Further, since the wedge portion 52a and the V-groove 53 are in linear contact with each other, even if there is a difference in tension between the spring members 54 provided on both sides of the physical pendulum 11, the torsional motion of the physical pendulum 11 (illustrated) Since a moment in the opposite direction to the twist about the Y axis and the twist about the Z axis shown in the figure is generated, the twist motion can be suppressed. Therefore, the measurement result of the laser interferometer 31 does not include the error of the torsional motion of the physical pendulum 11, and the acceleration applied to the measurement object can be accurately detected.

  Here, the wedge portion 52a is made of steel (tough material) and the V-groove 53 is made of sapphire (brittle material), but the toughness and brittle materials are not limited to this. Further, the tough / brittle relationship between the wedge portion 52a and the V groove 53 may be reversed.

  Examples of tough materials include 1000 series, 2000 series, 3000 series, 4000 series, 5000 series, 6000 series, 7000 series aluminum, oxygen-free copper, tough pitch copper, phosphorous deoxidized copper, phosphor bronze, aluminum bronze, silicon bronze, and western white. , Beryllium copper, chrome copper, brass, naval brass, high strength brass, gunmetal, austenitic, austenitic ferrite, ferrite, martensite, precipitation hardened stainless steel, general structural rolled steel, carbon steel for mechanical structure, carbon Tool steel, high speed tool steel, alloy tool steel, nickel chrome steel, nickel chrome molybdenum steel, chrome steel, chrome molybdenum steel, manganese steel, manganese chrome steel, heat resistant steel, steel carbon chrome bearing steel, aluminum chrome molybdenum steel, tungsten Metals and alloys, etc., and not tough materials ABS, ACS, alkyd resin, amino resin, ASA, bismaleimide triazine resin, cellulose plastic, chlorinated polyether, chlorinated polyethylene, allyl resin, epoxy resin, ethylene α-olefin copolymer, Ethylene vinyl acetate vinyl chloride copolymer, ethylene vinyl chloride copolymer, EVA resin, fluororesin, furan resin, ionomer, liquid crystal plastic, methacrylstyrene copolymer, nitrile resin, aromatic polyester, olefin vinyl alcohol copolymer, Phenolic resin, polyacetal, polyamide, polyamideimide, polyarylate, polyallylsulfone, polybenzimidazole, polybutadiene, polybutylene, polybutylene terephthalate, polycarbonate, polyether Teretherketone, polyetherimide, polyetherketone, polyethernitrile, polyethersulfone, polythioethersulfone, low density / high density polyethylene, polyethylene terephthalate, polyimide, polyaminobismaleimide, polyketone, methacrylic resin, polymethylpentene, modified Polyolefin, transparent polyolefin, polypropylene, polyphenyl ether, polyphenylene sulfide, polysulfone, polystyrene, SAN resin, styrene copolymer, butadiene styrene resin, polyurethane, polyvinyl acetal, polyvinyl alcohol, polyvinyl chloride, acrylic modified polyvinyl chloride, polychlorinated Vinylidene, silicone, unsaturated polyester resin, vinyl ester epoxy, polyvinyl acetate, xylene Fat, reinforced plastics and the like by the addition of plastics and fibers and particles such hard rubber. Metals and alloys may be changed in crystal structure, composition and hardness by tempering treatment.

  Brittle materials include minerals with a hardness of 7 or more, such as elemental minerals such as diamond, sensite, ironsenite, manganesesenite, zincsenite, gold dolomite, steel balls, quartz, phosphosilicate, and chalcedony , Oxidized minerals such as coeurite, borate minerals such as calcite, mafic olivine, garnet group, zircon, columbite, topaz, cruciform, green beryl, quinousite, tourmaline, ono Examples include silicate minerals such as stones, jadeite, lithiateite, and dumbstone. Naturally produced ores may be processed and used. However, if processing is difficult or the unit price of the material is expensive, the powder is applied only to the surface of the base material processed with metal, inorganic material, plastics, etc. The same effect can be obtained by using a method of body bonding, artificially synthesizing a film or particles on the surface of the base material, or physical coating.

Embodiment 3 FIG.
FIG. 4 is a diagram illustrating a support structure of a physical pendulum of the accelerometer according to the third embodiment. In FIG. 4, the same parts as those of the first embodiment shown in FIG. 4 shows only the support structure portion of the physical pendulum 11, and other configurations (such as electrical components for measuring acceleration) are the same as those in FIG. 1 and are not shown.

  The support structure 61 of the physical pendulum 11 according to the third embodiment is a structure combined with the first embodiment and the second embodiment, and in the support structure of the physical pendulum 11 according to the first embodiment shown in FIG. 3 and the physical pendulum 11 are connected to each other by adopting the structure of the second embodiment. That is, in the third embodiment, the ends of the two end portions 12a branched in the physical pendulum 11 are formed in a wedge shape to form the wedge portion 62a, and the support 3 is connected to the two end portions 12a. A V-groove 63 is provided in the portion. Note that the V-groove 63 is formed from one end surface of the support column 3 in the X-axis direction to the other end surface. Further, the V-shaped angle of the V-groove 63 is formed larger than the tip angle of the wedge portion 62a, and the tip of the wedge portion 62a of the physical pendulum 11 abuts on the tip of the V-groove 63 of the support column 3, The weight 13 of the physical pendulum 11 is displaced in the direction of acceleration with the contact portion as a fulcrum so that the pendulum moves.

  Moreover, it is the same as that of Embodiment 2 also about the point which made the material of the wedge part 62a of the physical pendulum 11 and the V groove 63 of the support | pillar 3 mutually different.

  By adopting such a structure, the same effects as those of the first and second embodiments can be obtained.

Embodiment 4 FIG.
FIG. 5 is a diagram illustrating a support structure of a physical pendulum of the accelerometer according to the fourth embodiment. In FIG. 5, the same parts as those of the third embodiment shown in FIG. 5 shows only the support structure portion of the physical pendulum 11, and other configurations (such as electrical components for measuring acceleration) are the same as those in FIG. 1 and are not shown.

  The support structure 71 of the physical pendulum 11 according to the fourth embodiment is provided with regulating means for preventing the wedge portion 62a of the physical pendulum 11 from moving in the extending direction of the V groove 63 and deviating from the V groove 63. is there. In this example, the restricting means is composed of a plate material 72 that closes an end surface portion of the support column 3 including the V-groove 63. If the physical pendulum 11 moves in the X-axis direction due to, for example, an impact applied to the column 3, an error occurs in the detected acceleration due to the movement. For this reason, a plate member 72 is provided to restrict movement in the X-axis direction.

  According to the support structure 71 of the physical pendulum 11 configured as described above, the wedge 62a of the physical pendulum 11 moves in the X-axis direction even when vibration or impact is applied during acceleration measurement or installation. Since it can prevent by the board | plate material 72, it becomes possible to detect an acceleration correctly.

  The restricting means is not limited to the configuration shown in the figure. For example, instead of providing the V groove 63 from the end surface of the support column 3 in the X-axis direction to the end surface, as shown in FIG. The V groove 63 may be provided only in the portion facing the two branched end portions 12a. In this case as well, the wedge portion 62a of the physical pendulum 11 is similarly prevented from moving in the X-axis direction. Can do.

It is a figure which shows the support structure of the physical pendulum of the accelerometer of Embodiment 1 of this invention. It is explanatory drawing of a laser interferometer. 6 is a diagram showing a support structure of a physical pendulum of an accelerometer according to Embodiment 2. FIG. FIG. 6 is a diagram showing a support structure of a physical pendulum of an accelerometer according to a third embodiment. FIG. 10 is a diagram showing a support structure of a physical pendulum of an accelerometer according to a fourth embodiment. It is a figure which shows the other example of a control means. It is a figure which shows the support structure of the physical pendulum of the conventional accelerometer.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Accelerometer 2 Base 3 Support | pillar 11 Physical pendulum 12 Support part 12a End part 13 Weight 14 Metal thin plate 15 Spring member (biasing means)
16 Constant elastic spring (elastic means)
DESCRIPTION OF SYMBOLS 31 Laser interferometer 41 Control circuit 51 Support structure of physical pendulum 52 Support part 52a Wedge part 53 V groove 54 Spring member 61 Support structure of physical pendulum 62a Wedge part 63 V groove 71 Support structure of physical pendulum 72 Plate material

Claims (5)

In the support structure of the physical pendulum of the accelerometer that measures the pendulum motion of the physical pendulum according to the acceleration and calculates the acceleration based on the measurement result,
Together impart pendulum motion to said physical pendulum, the pendulum, and resilient means for supporting vertically the posts erected in the direction of the acceleration, the pendulum of the pendulum pre Symbol physical pendulum biases the strut side An urging means for prolonging the cycle of movement,
The physical pendulum has a configuration in which a wedge portion is provided at one end and a weight is fixed to the other end, and a tip of the wedge portion is provided on the support column and has a larger angle than the angle of the wedge portion. The weight of the physical pendulum is displaced in the direction of acceleration and the pendulum moves with the contact portion as a fulcrum ,
The support structure for a physical pendulum of an accelerometer , wherein the biasing means is disposed so that a connection position between the biasing means and the support column is located on the back side of the contact portion . In the support structure of the physical pendulum of the accelerometer that measures the pendulum motion of the physical pendulum according to the acceleration and calculates the acceleration based on the measurement result,
Provided with a pendulum motion to the physical pendulum, elastic means for supporting the physical pendulum perpendicularly to a support column erected in the direction of acceleration, provided on both sides of the physical pendulum, and attaching the physical pendulum to the support column side Energizing means for enlarging the period of the pendulum motion of the physical pendulum,
The physical pendulum has a configuration in which a wedge portion is provided at one end and a weight is fixed to the other end, and a tip of the wedge portion is provided on the support column and has a larger angle than the angle of the wedge portion. The weight of the physical pendulum is displaced in the direction of acceleration and the pendulum moves with the contact portion as a fulcrum ,
The support structure for a physical pendulum of an accelerometer , wherein the biasing means is disposed so that a connection position between the biasing means and the support column is located on the back side of the contact portion . The V-groove is formed from one end surface to the other end surface in a direction orthogonal to the direction of acceleration on a connection surface of the support column with the wedge portion, and the support portion includes the wedge portion of the physical pendulum. 3. A support structure for a physical pendulum of an accelerometer according to claim 1, further comprising a restricting means for preventing the deviating from the V groove.   4. The support structure for a physical pendulum for an accelerometer according to claim 3, wherein the restricting means is formed of a plate material that closes an end surface portion including the V groove of the support column. An accelerometer comprising the support structure for a physical pendulum of the accelerometer according to any one of claims 1 to 4 .

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