JP3882873B2 - Adjustment method of electromagnetic relay operating characteristics - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a method for adjusting the operating characteristics of an electromagnetic relay suitable for a board-mounted ultra-small electromagnetic relay, etc., in which variations in dimensions and characteristics of components are unavoidable due to size and power consumption restrictions. The present invention relates to a method for adjusting the operating characteristics of an electromagnetic relay in which the mismatch between the attractive force of an electromagnet and the load applied against it due to variations in dimensions and characteristics is corrected by changing the movable iron piece by bending it. .
[0002]
[Prior art]
  As is well known, the basic structure of an electromagnetic relay includes an electromagnet, a movable iron piece that is attracted to the magnetic pole of the electromagnet, a return spring that applies a restoring force to the movable iron piece, and a contact that is opened and closed in conjunction with the movable iron piece. Mechanism. When a change occurs in the current flowing through the electromagnet, the balance between the attractive force of the electromagnet and the load applied against it (mainly by the return spring) changes, and the contact mechanism operates or returns. That is, when a current flows through the coil of the electromagnetic relay, the movable iron piece is attracted to the iron core by electromagnetic action. The movable iron piece needs a force to return when the current of the coil is cut off. The return force is applied by a return spring. In order for the movable iron piece to operate stably even during the operation, the suction force must constantly overcome the return force.
[0003]
  The relationship between the load load and the attractive force of a general electromagnetic relay is shown in the graph of FIG. In the figure, the vertical axis represents the load (g) or the suction force (g), the horizontal axis represents the stroke (mm) between the operation state and the return state of the contact mechanism, F11 represents the suction force for starting the operation of the relay, F12 is an attractive force for the relay to perform a stable operation, F13 is an attractive force for starting the relay, F2 is a load load, AT1 is a magnetomotive force corresponding to the attractive force F11, and AT2 corresponds to the attractive force F12 A magnetomotive force, AT3 is a magnetomotive force corresponding to the attractive force F13, A is an operating point at which the b contact is released, B is an operating point at which the a contact is turned on, and C is an operating point at which the relay is completed. In the figure, the attractive force is expressed using a magnetomotive force calculated from the coil current as a parameter. When the coil current gradually increases and reaches magnetomotive force AT1, the attractive force becomes greater than the load load, and the movable iron piece is attracted. Also, a larger magnetomotive force AT2 is required for the relay to operate stably with respect to temperature, vibration, input fluctuation, and the like. On the other hand, when the input current is gradually decreased to reach magnetomotive force AT3, the attractive force becomes smaller than the load load at point C, and the movable iron piece returns instantaneously. The load load is a combination of the return spring and the load caused by the bending of the leaf spring that is the movable contact piece. That is, until the point A at which the normally closed contact (b contact, break contact) is released, the load load is a combination of the return force of the return spring and the negative force of the leaf spring. During the period from point A to point B where the movable contact is not in contact with either fixed contact, the load is the force of the return spring only. During the period from point B to point C where the normally open contact (a contact, make contact) is closed, the load load is a combination of the positive force of the return spring and the leaf spring. As described above, a representative load curve as shown in FIG. 11 is drawn.
[0004]
[Problems to be solved by the invention]
  When a sufficient size and power consumption are allowed for an electromagnetic relay, an electromagnet that generates a large magnetic force can be used, and even with a combination of components that vary somewhat in size, a stable operating voltage and A return voltage can be secured.
[0005]
  However, when trying to reduce the size and power consumption of the relay, (1) the magnetic force that can be generated from the built-in electromagnet becomes smaller, and (2) the accuracy required for the component parts becomes strict due to the structure. There is a problem that it is difficult to realize. That is, when the generated magnetic force of the electromagnet is reduced, the width of the attractive force corresponding to the operating state and the return state is reduced, and accordingly, the allowable width of variation in the spring load is reduced. In addition, it is more difficult to match the attractive force of the electromagnet and the spring load due to the relative deterioration of the processing accuracy due to the downsizing of the component parts. Therefore, in electromagnetic relays that are reduced in size and power consumption, it is essential to adjust the attractive force or spring load in order to match the attractive force of the electromagnet with the load against it. Yes. In addition, in an electromagnetic relay including a poled movable iron piece for holding a permanent magnet, the attraction force and load load are matched by adjusting the attraction force by demagnetizing the permanent magnet. As the miniaturization and the reduction in power consumption progress further, such a method cannot be adjusted and the characteristics become poor, leading to a decrease in yield.
[0006]
  The present invention has been made paying attention to such conventional problems, and the object of the present invention is to attract attraction force of electromagnets caused by variations in dimensions and characteristics of component parts and load load against the force. Thus, it is possible to easily correct the inconsistency with the electromagnetic relay, and thereby to provide an operation characteristic adjustment method of an electromagnetic relay that can be applied to a micro electromagnetic relay such as a board-mounted chip relay.
[0007]
[Means for Solving the Problems]
  The invention of this application is a method for adjusting the operating characteristics of an electromagnetic relay having a base block (100) and a movable block (200).
[0008]
Here, the base block (100) includes an electromagnet having a U-shaped iron core (1) disposed with both end magnetic pole portions (1a, 1b) facing upward, and one magnetic pole (1a) of the U-shaped iron core. ) Of a pair of normally closed fixed contacts (6a, 7a) located on both sides of the left and right sides and a pair of normally open fixed contacts (6b) located on the left and right sides of the other magnetic pole (1b) of the U-shaped iron core. 7b) is integrated with the resin portion, and the support portion (10a, 10b) serving as a fulcrum for seesaw movement is provided at the center portion in the longitudinal direction of the upper surface, and the left and right side portions of the center portion in the longitudinal direction are always provided. It has a structure called a pair of spring piece joints (11a, 11b) that have an inclined surface with the closed contact side low and the normally open contact side high.
[0009]
The movable block (200) is provided with a normally closed iron piece end (13a) at one end in the longitudinal direction, and a normally open iron piece end (13b) at the other end. A poled movable iron piece (13) magnetically polarized in the thickness direction, and arranged parallel to both sides of the poled movable iron piece, and a normally closed side movable contact piece ( 14a, 15a), a normally open side movable contact piece (14b, 15b) is provided at the other end, and a T-shaped portion which functions as a torsion spring at the side edge of the central portion in the longitudinal direction. The left and right movable conductor pieces (14, 15) having the hinge spring pieces (14c, 15c) are integrated by the resin part (20), and the base block support part is provided at the longitudinal center of the lower surface thereof. Recesses (18a, 18) corresponding to (10a, 10b) ) And say you are those having the structure.
[0010]
This method has the first to fifth steps.
[0011]
Here, the first step is a lower surface to be a virtual hinge spring weld surface (P1) applied to the hinge spring piece (14c, 15c) in a state where the movable block (200) is turned upside down, It is parallel to the hinge spring welding surface (P1) and has a known height difference (Href), and is located on both sides of the longitudinal ends (13a, 13b) of the poled movable iron piece (13), and also has a measurement reference plane ( We will prepare a measuring jig (21) that has an upper surface that becomes P2).
[0012]
The second step is a horizontal posture in which the virtual hinge spring welding surface (P1) is applied to the hinge spring pieces (14c, 15c), and on the movable block (200) turned upside down. It is a stack of measuring jigs (21).
[0013]
The third step is to scan the laser beam obtained from the laser displacement meter 23 in the horizontal direction in a state where the measuring jig (21) is superimposed on the movable block (200) turned upside down. Then, the height of the normally closed side or normally open side iron piece end (13a or 13b) of the movable iron piece and the height of the measurement reference plane (P2) are measured at the same time, and the distance (Hx) is obtained as a step between the two. There is.
[0014]
The fourth step is the sum (Hx + Href) of the determined step (Hx) and the known value (Href), and the joint surface of the spring piece joint (11a) and the normally closed or normally open iron piece end. The distance (H3 'or H4') from (13a or 13b) is obtained, and the bending amount is obtained as the difference (H3'-H3 or H4'-H4) from the design value (H3 or H4).
[0015]
The fifth step is to bend the normally closed side or normally open side iron piece end (13a or 13b) of the movable iron piece according to the bending amount thus obtained.
[0016]
  The meaning of “bending” is to correct the movement stroke of the movable iron piece. Usually, this bending process is performed in the comparatively front-end | tip part of a movable iron piece. In addition, the meaning of “polar movable iron piece” is that magnetic polarization occurs in the movable iron piece. In addition to the method of magnetizing the movable iron piece itself, there is a method of separately holding a permanent magnet on the movable iron piece as a method for generating this magnetic polarization.
[0017]
  And according to this invention, from the viewpoint different from the adjustment method of changing the attractive force of the electromagnet or changing the repulsive force of the return spring by changing the gap between the movable iron piece and the magnetic pole, the electromagnet The mismatch between the suction force and the load applied against it can be corrected, and if this is applied to a substrate-mounted ultra-small chip relay, the product yield can be significantly improved. This change includes both the case where the gap between the movable iron piece and the magnetic pole is enlarged and the case where the gap is reduced.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
  As described above, the operation characteristic adjustment method according to the present invention can detect the mismatch between the attractive force of the electromagnet and the load applied against it due to variations in the dimensions and characteristics of the component parts. The size of the gap between the iron piece and the magnetic pole is corrected by bending the movable iron piece to change it. This method is an electromagnetic relay having an electromagnet, a movable iron piece attracted by a magnetic pole of the electromagnet, a return spring that applies a restoring force to the movable iron piece, and a contact mechanism that opens and closes in conjunction with the movable iron piece. Can be widely applied. In particular, in the following embodiments, a case will be described in which the present invention is applied to an ultra-small electromagnetic relay (referred to as a chip relay or the like) that can be mounted on a circuit board as a surface-mounted component.
[0019]
  FIG. 1 shows an exploded perspective view of the chip relay to which the present invention is applied with the upper cover removed. As shown in the figure, the chip relay includes a base block 100 and a movable block 200. The base block 100 is a resin molded product having a substantially rectangular parallelepiped appearance having a length of 9.0 mm, a width of 5.9 mm, and a height of 4.4 mm. The inside includes a fixed side portion of a contact mechanism in addition to an electromagnet. It is. An example of the structure of the built-in electromagnet is shown in FIG. As shown in FIG. 2A, the iron core 1 of the electromagnet has a lateral U shape, and magnetic pole portions 1a and 1b are provided at both ends thereof. The magnetic pole portions 1a and 1b are resin-molded to form flange portions 2a and 2b. As shown in FIG. 2B, a coil 3 is wound around the body portion of the iron core 1 sandwiched between the magnetic pole portion 1a and the magnetic pole 1b. Both ends of the winding of the coil 3 are joined in a state of being wound around the curled portions 4 a and 4 b and led out to the relay terminal 5. Reference numerals 5 a and 5 b are connecting pieces for fixing the electromagnet to the base block 100.
[0020]
  Returning to FIG. 1, this chip relay is provided with two independent single-pole double-throw (SPDT) contact mechanisms for two circuits. As will be described in detail later, these two contact mechanisms are arranged on both sides in parallel with the electromagnet. In FIG. 1, a part of the two contact mechanisms is exposed on the upper surface of the base block 100. That is, 6a is a normally closed fixed contact constituting the first contact mechanism, 6b is a normally open fixed contact constituting the first contact mechanism, 7a is a normally closed fixed contact constituting the second contact mechanism, 7b is a normally open fixed contact constituting the second contact mechanism. In addition, 8a is a coil terminal that conducts to the relay terminal 5a (see FIG. 4), 9a is a fixed contact terminal that conducts to the normally closed fixed contact 6a, and 9b is a fixed contact terminal that conducts to the normally open fixed contact 6b.
[0021]
  A movable block 200, which will be described later, is placed on the upper surface of the base block 100, and is supported so that the seesaw can move freely with support protrusions 10a and 10b formed on the upper surface of the base block 100 as fulcrums. Reference numerals 11a and 11b denote spring piece joints for joining hinge spring pieces (details will be described later) protruding from both sides of the movable block 200. The upper surfaces of these spring piece joint portions 11a and 11b are inclined surfaces such that the normally closed contacts 6a and 7a are low and the normally open contacts 6b and 7b are high. Reference numeral 12a denotes a common terminal that conducts to the spring piece joint 11a.
[0022]
  The movable block 200 is configured by integrating the movable iron piece 13 and the two movable conductor pieces 14 and 15 by the resin portion 16. The details of the movable iron piece 13 and the two movable conductor pieces 14 and 15 in a state before being integrated by the resin portion 16 are shown in FIG.
[0023]
  As shown in FIG. 2A, the movable iron piece 13 and the two movable conductor pieces 14 and 15 are formed by placing the movable conductor piece 14 and the movable conductor piece 15 on the left and right sides of the movable iron piece 13 in the middle. In a state where they are arranged in parallel, they are integrally bonded with resin. The state in which they are turned upside down is shown in FIG. 2B, and on the back side of the movable iron piece 13, a permanent magnet 16 magnetized in the thickness direction is fixed. As a result, the movable iron piece 13 Magnetic polarization is performed in the thickness direction (for example, both iron piece end portions 13a and 13b are both S poles), and thereby a pole-movable iron piece is configured. The movable conductor piece 14 constituting the first contact mechanism is integrally formed with a normally closed movable contact piece 14a, a normally open movable contact piece 14b, and a T-shaped hinge spring piece 14c. . Similarly, the normally closed movable contact piece 15a, the normally open movable contact piece 15b, and the T-shaped hinge spring piece 15c are integrally formed on the movable conductor piece 15 constituting the second contact mechanism. Is formed. As shown in FIG. 5B, the tip of each movable contact piece 14a, 14b, 15a, 15b is bifurcated, and a movable contact 17 is formed at each branched tip. Has been. The hinge spring pieces 14c and 15c function mechanically as torsion springs, while electrically functioning as a common terminal. And the site | part corresponded to the T-shaped horizontal bar part of these hinge spring piece parts 14c and 15c is fixed to the inclined surface of spring piece junction part 11a, 11b on the base block 100 demonstrated previously by welding.
[0024]
  FIG. 2 shows a state in which the movable block 200 integrally joined by the resin portion 20 is turned upside down. As shown in the figure, two recesses 18 a and 18 b are provided on the back side of the resin portion 20. These concave portions 18a and 18b correspond to the support convex portions 10a and 10b on the base block 100 described above. Therefore, as shown in FIG. 1, when the movable block 200 is placed on the base block 100 and the hinge spring pieces 14c and 15c are welded and fixed to the upper inclined surfaces of the spring piece joint portions 11a and 11b, the movable block 200 is obtained. The seesaw is supported so as to be movable with the support protrusions 10a and 10b as fulcrums, and the normally closed contact side is urged downward by the torsion spring function of the hinge spring pieces 14c and 15c. In FIG. 2, the suction portions 19 a and 19 b located at the tips of the normally closed side iron piece end portion 13 a and the normally open side iron piece end portion 13 b are portions that come into contact with the magnetic pole portions 1 a and 1 b provided on the base block 100. is there.
[0025]
  Next, on the premise of the structure of the chip relay described above, the operation characteristic adjusting method of the present invention will be described. The relationship between the base block 100 and the movable block 200 constituting the chip relay is schematically shown in FIGS. 5 (a) and 5 (b). As shown in the plan view of FIG. 6A, the movable iron piece 13 is magnetically polarized so that, for example, the normally closed side iron piece end portion 13a and the normally open side iron piece end portion 13b are both S poles. In the state where no current flows through the coil constituting the electromagnet, the normally closed side iron piece end portion 13a and the magnetic pole portion 1a are in contact with each other. The side iron piece end portion 13b and the magnetic pole portion 1b come into contact with each other. In this way, when the movable block 200 performs seesaw motion, single-pole double-throw contacts for two circuits constituting the first and second contact mechanisms are operated.
[0026]
  As shown in the side view of FIG. 5B, the operation stroke S of the movable iron piece 13 is expressed by the following equation.
[0027]
    S = H1 + H2 + H3 + H4
  here,
  H1: Distance between the contact surface of the magnetic pole portion 1a and the joint surface of the spring piece joint portion 11a
  H2: Distance between the contact surface of the magnetic pole portion 1b and the joint surface of the spring piece joint portion 11a
  H3: distance between the joint surface of the spring piece joint portion 11a and the contact surface of the normally closed iron piece end portion 13a
  H4: Distance between the joint surface of the spring piece joint portion 11a and the contact surface of the normally open side iron piece end portion 13b
[0028]
  By the way, in the case of the chip relay having the structure shown in FIGS. 1 to 4, the values of the distances H1 and H2 shown in FIG. 5B are given as known values. This is because the height of the magnetic pole portions 1a and 1b and the height of the spring piece joint portion 11a can be managed to some extent by the positioning accuracy during resin molding. On the other hand, the values of the distances H3 and H4 shown in FIG. 5B are the distortion at the time of pressing the movable conductor pieces 14 and 15, and the values at the time of integral molding of the movable iron piece 13 and the movable conductor pieces 14 and 15. It is difficult to manage with a certain accuracy due to positioning errors and the like. The values of the distances H3 and H4 directly lead to a mismatch between the attractive force of the electromagnet and the load applied against it. Therefore, in the present invention, the distances H3 and H4 are changed by bending the movable iron piece 13, thereby correcting the mismatch between the attractive force of the electromagnet and the load applied against it.
[0029]
  FIGS. 6A and 6B show an example of a specific method for measuring the distances H3 and H4. In this measuring method, as shown in FIG. 6A, a special measuring jig 21 applied to the movable block 200 turned upside down is used. The measurement jig 21 is provided with a virtual hinge spring welding surface (P1) and a measurement reference surface (P2) as shown in FIG. The distance between the virtual hinge spring weld surface (P1) and the measurement reference surface (P2) is given as a known value as Href. As shown in FIG. 5A, the measuring jig 21 is placed on the upside-down movable block 200, and its virtual hinge spring weld surface P1 is placed on the hinge spring piece 15c.Make contact and applyIn this state, as shown in FIG. 5B, the laser beam obtained from the laser displacement meter is scanned in the direction orthogonal to the paper surface, and the height of the movable iron piece 13b and the height of the measurement reference plane P2 are simultaneously set. The distance Hx is obtained as a step between the two. As a result, H3 or H4 shown in FIG. 5B is obtained as Href + Hx. In this way, when H1 to H4 shown in FIG. 5B are obtained, the bending amount is obtained as the difference between the measured values H3 ′ and H4 ′ with respect to the design values H3 and H4.
[0030]
  The state of the bending process for the movable iron piece 13 is schematically shown in the explanatory view of FIG. In this example, the bending process for the iron piece 13 is performed at the tip portions at both ends thereof. Therefore, the movable iron piece 13 is sandwiched and fixed from above and below by a movable iron piece fixing jig 22 having an upper mold 22a and a lower mold 22b. In this state, the bending claw 24 is hooked on the tip of the movable iron piece, and a force is applied upward or downward to move the normally closed side iron piece end 13a or the normally open side iron piece end 13b in a desired direction to a desired processing amount. Only bend. The degree of bending performed is always measured by the laser displacement meter 23. By using such a movable iron piece fixing jig 22, only the tip of the movable iron piece 13 can be easily bent with respect to the movable block 200.
[0031]
  Next, with reference to FIG. 8 to FIG. 10, how the mismatch between the attractive force of the electromagnet and the load applied against it is corrected.
[0032]
  First, with reference to FIGS. 8A and 8B, the relationship between the attractive force and the load load when the hinge spring and the movable iron piece are in a positional relationship in design will be described. To do. FIG. 8A shows a design positional relationship between the hinge spring and the movable iron piece. As is clear from the figure, the distance between the hinge spring and the movable iron piece is a on either the normally open contact side or the normally closed contact side when in the design positional relationship. FIG. 4B shows the relationship between the designed suction force and the applied load. In the figure, C1 is a suction force (design value) for stable operation of the relay, C2 is a suction force (design value) at which the relay starts to return, and C31 is a load load (design value) centered on the spring load. is there. As is apparent from the graph, when the hinge spring and the movable iron piece are in a design positional relationship, the load load curve C31 falls between the two attractive force curves C1 and C2. Therefore, stable operation is guaranteed over the entire stroke.
[0033]
  Next, the relationship between the attractive force and the load load when the positional relationship between the hinge spring and the movable iron piece deviates from the design value will be described with reference to FIGS. 9 (a) and 9 (b). As shown in FIG. 5A, in this case, the distance between the hinge spring and the movable iron piece is wide by e on the normally closed contact side, and conversely by e on the normally open contact side. The relationship between the suction force and the applied load in this case is shown in FIG. In the figure, C32 is a load curve. As is apparent from the figure, in this case, the load load curve C32 deviates from between the two attractive force curves C1 and C2. Therefore, it can be seen that the return force is hindered by the suction force C2 as designed.
[0034]
  Finally, the relationship between the attractive force and the load load after correcting the positional relationship between the hinge spring and the movable iron piece will be described with reference to FIGS. 10 (a) and 10 (b). As shown in FIG. 5A, in this case, as a result of bending, the distance between the hinge spring and the movable iron piece is corrected to a for both the normally closed side and the normally open side. The relationship between the suction force after bending correction and the applied load is shown in FIG. In the figure, C33 is a load curve after bending correction. As is apparent from the figure, the load curve C33 after bending correction is obtained by shifting (biasing) the load curve C32 before correction upward by ΔF as indicated by an arrow in the figure. As a result, the corrected load curve 33 is located between the two attractive force curves C1 and C2, and it can be seen that the operating characteristics have been corrected to operate stably over the entire stroke.
[0035]
  As is apparent from FIGS. 8 to 10, the inconsistency between the attractive force of the electromagnet and the load applied against it due to variations in the dimensions and characteristics of the component parts is due to the polar movable iron piece and the iron core at the seesaw moving neutral position. It is corrected by changing the size of the gap with the magnetic pole by bending the poled movable iron piece.
[0036]
【The invention's effect】
  As is clear from the above description of the embodiment, according to the present invention, the return spring is adjusted to compensate for the mismatch between the attractive force of the electromagnet and the load applied against it due to variations in the dimensions and characteristics of the components. It can be realized easily and accurately from a viewpoint completely different from the conventional method of adjusting the attractive force of the electromagnet. Also, in the case of electromagnetic relays using polarized movable iron pieces, the mismatch between the attractive force and the load load is almost completely corrected even if it is not sufficient to adjust the magnetization intensity of the permanent magnet. Can do.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing a structure of an electromagnetic relay to which the present invention is applied with an upper cover removed.
FIG. 2 is a perspective view showing the movable block constituting the electromagnetic relay upside down.
FIG. 3 is a perspective view showing an internal structure of the movable block.
FIG. 4 is a perspective view showing a structure of an electromagnet built in the base block.
FIG. 5 is an explanatory view schematically showing the structure of the electromagnetic relay.
FIG. 6 is an explanatory diagram showing a method for measuring a gap between a movable iron piece and an iron core magnetic pole before bending.
FIG. 7 is an explanatory diagram showing a state of bending with respect to the movable iron piece.
FIG. 8 is an explanatory diagram showing a relationship between a suction force and a load when the positional relationship between the hinge spring and the movable iron piece is in a designed state.
FIG. 9 is an explanatory diagram showing a relationship between a suction force and a load when a positional relationship between the hinge spring and the movable iron piece is out of a design value.
FIG. 10 is an explanatory diagram showing the relationship between the attractive force and the load load after the positional relationship between the hinge spring and the movable iron piece is corrected by bending.
FIG. 11 is an explanatory diagram showing a relationship between a load load and a suction force of a general relay.
[Explanation of symbols]
  100 base block
  200 movable block
  1 Iron core
  1a, 1b Magnetic pole part
  2a, 2b Flange
  3 coils
  4a and 4b
  5a Relay terminal
  5b, 5c connecting piece
  6a, 7a Normally closed fixed contact
  6b, 7b Normally open side fixed contact
  8a Coil terminal
  9a, 9b Fixed contact terminal
  10a, 10b Support convex part
  11a, 11b Spring piece joint
  12a Common terminal
  13 Movable iron pieces
  13a Normally closed iron piece end
  13b Normally open iron piece end
  14, 15 Movable conductor piece
  14a, 15a Normally closed side movable contact piece
  14b, 15b Normally open side movable contact piece
  14c, 15c Hinge spring piece
  16 Permanent magnet
  17 Movable contact
  18a, 18b recess
  19a, 19b adsorption part
  20 Resin part
  21 Measuring jig
  22 Movable iron piece fixing jig
  22a Upper mold
  22b Lower mold
  23 Laser displacement meter
  24 Bending nails

Claims (1)

A pair of electromagnets having a U-shaped iron core (1) arranged with the magnetic pole portions (1a, 1b) at both ends facing upward and a left and right sides of one magnetic pole (1a) of the U-shaped iron core. The normally closed fixed contacts (6a, 7a) and a pair of normally open fixed contacts (6b, 7b) located on the left and right sides of the other magnetic pole (1b) of the U-shaped iron core are integrated by a resin part. At the center of the upper surface in the longitudinal direction, the support portions (10a, 10b) serving as fulcrums of the seesaw movement are provided, and the left and right side portions of the longitudinal center are low in the normally closed contact side and high in the normally open contact side. A base block (100) provided with a pair of spring piece joints (11a, 11b) which become inclined surfaces,
  A normally closed iron piece end (13a) is provided at one end in the longitudinal direction, and a normally open iron piece end (13b) is provided at the other end, which is further magnetically polarized in the thickness direction. The pole movable iron piece (13) is arranged in parallel with both sides of the pole movable iron piece, and a normally closed movable contact piece (14a, 15a) is provided at one end in the longitudinal direction, and the other A normally open movable contact piece (14b, 15b) is provided at the end, and a T-shaped hinge spring piece (14c, 15c) functioning as a torsion spring is provided at the side edge of the central portion in the longitudinal direction. And the left and right movable conductor pieces (14, 15) are integrated by the resin portion (20), and a concave portion corresponding to the support portion (10a, 10b) of the base block is formed in the longitudinal central portion of the lower surface thereof. Movable block (2) provided with (18a, 18b) And 0),
  An operating characteristic adjusting method applied to an electromagnetic relay having
  In a state in which the movable block (200) is turned upside down, the lower surface serving as a virtual hinge spring welding surface (P1) applied to the hinge spring piece portions (14c, 15c) and the hinge spring welding surface (P1) are parallel and known. And has an upper surface that is located on both sides of both ends (13a, 13b) in the longitudinal direction of the poled movable iron piece (13) and has an upper surface that serves as a measurement reference surface (P2). A first step of preparing a jig (21);
  The measuring jig (21) is stacked on the movable block (200) turned upside down in a horizontal posture in which the virtual hinge spring welding surface (P1) is applied to the hinge spring pieces (14c, 15c). Two steps,
  In a state where the measuring jig (21) is overlapped on the movable block (200) turned upside down, the laser beam obtained from the laser displacement meter 23 is scanned in the horizontal direction, and the normally closed side of the movable iron piece or A third step of simultaneously measuring the height of the normally open side iron piece end (13a or 13b) and the height of the measurement reference plane (P2), and obtaining a distance (Hx) as a step between both;
  As the sum (Hx + Href) of the determined step (Hx) and the known value (Href), the distance between the joint surface of the spring piece joint (11a) and the normally closed or normally open side iron piece (13a or 13b) A fourth step of obtaining (H3 ′ or H4 ′) and further obtaining a bending amount as a difference (H3′−H3 or H4′−H4) from a design value (H3 or H4);
  A fifth step of bending the normally closed side or normally open side iron piece end (13a or 13b) of the movable iron piece corresponding to the bending amount thus obtained,
  A method for adjusting the operating characteristics of an electromagnetic relay, comprising:

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