JPS6022806B2 - release type electromagnet device - Google Patents

Description

[Detailed description of the invention] The present invention relates to a release type electromagnet device.

The release type electromagnet device of the present invention is composed of a movable body and a restraining body, one of which is a permanent magnet and the other of which is an electromagnet. After a period of time, the electromagnet is energized to operate in a direction that counteracts the magnetic force of the permanent magnet, thereby releasing the above-mentioned constraint.

Such an electromagnetic device is applied to, for example, an electric shutter camera, in which the operation of the shutter closing member is restrained by a permanent magnet for a certain period of time after the shutter opening member operates, and the electromagnet is activated after a certain period of time. It is used to close the shutter and release the material.

1 and 2 illustrate a conventional release type electromagnet device.

In this example, the movable body 1 is composed of a permanent magnet, and the restraint body 2 is composed of an electromagnet. That is, the movable body 1 holds two permanent magnets 4 and 5 between them, for example, as indicated by S-N from above in FIG. The magnetic poles are arranged so as to face in the same direction, and the upper and lower sides are sandwiched and bonded with plates made of non-magnetic iron, permalloy, etc. to form the yoke part 6 and the adsorption part 7. . The attracting portion 7 is set to have a single polarity, such as N pole, depending on the polarity of the permanent magnets 4 and 5. Further, the restraint body 2 has first and second arm portions 8a and 8b on the same side.
For example, a coil 9 is wound around the second arm portion 8b of a U-shaped core 8 made of a ferromagnetic material such as ferrite. When the coil 9 is energized, the movable body 1
It is wound so that a magnetic force in a direction opposite to the polarity of the attracting part 7 caused by the permanent magnets 4 and 5 is generated in the attracted part 8c, which will be described later. The restraining body 2 has the first arm 8a of the core 8 fixed to a stationary member (not shown) by screws 10 and 11, and the movable body 1 has the separating piece 3 fixed to a support punch 13 by a shaft 12. It is swingably connected to the end of one arm. The support punch 13 corresponds to a shutter closing member in an electric shutter of a camera, and is rotatably supported by a crane 14, and is rotated around a shaft 14 by a spacing coil spring 15 hung on the end of the arm. It has a habit of rotating clockwise. The ends of the first and second arm parts 8a and 8b of the core 8 of the restraint body 2 are the first and second attracted parts 8c and 8d, and the movable body 1 has the permanent magnets 4 and 8b.
Due to the magnetic force of 5, the first part of this restraint body 2 is
, has a habit of constantly adsorbing to the second adsorbed parts 8c and 8d. On the other hand, the coil spring 15 acts on the support punch 13 so as to separate the movable body 1 from the restraining body 2 with a force weaker than the attraction force due to the magnetic force of the permanent magnets 4 and 5. In the initial state shown in FIG. 1, the movable body 1 is restrained from operating by the restraining body 2 due to the magnetic force of the permanent magnets 4 and 5, and the movement of the movable body 1 is restricted by the restraining body 2 due to the magnetic force of the permanent magnets 4 and 5. movement is suppressed. When the coil 9 is energized in this state, the restraint body 2 generates a magnetic force in the first attracted part 8c in a direction that counteracts the magnetic force of the attraction part 7 of the movable body 1, and the movable body 1 Due to this repulsive magnetic force and the effectiveness of the coil spring 15, the second
As shown in the figure, it is released from the restraint body 2, and the support village 13 is allowed to rotate in all directions counterclockwise.

This kind of release-type electromagnet device has excellent advantages such as there is no risk of the magnetic force of the permanent magnet decreasing over time, and because the coil only needs to be energized when the movable body is released, it consumes only a small amount of power. However, on the other hand, Figures 1 and 2
In conventional devices such as the one shown in the figure, when the movable body is released from the restraint body, the separation action is uneven, which makes it difficult to adjust the force of the spacing coil spring or torsion spring. However, there were drawbacks such as the need to set the magnetic force of the electromagnet relatively large.

The present invention adds ingenuity to each part of the device and sets the movable body to separate first from the attracted part where the coil of the restraining body is wound. To provide a release type electromagnet device which facilitates the adjustment of the force of a spring, allows the magnetic force of an electromagnet to be small, and which nevertheless operates extremely accurately.

The present invention will be specifically explained below with reference to FIGS. 3 to 11.

In the following description, members having the same construction and function as those shown in FIG. 1 are designated by the same reference numerals as those shown in FIG. 1, and the description thereof will be omitted.

3 and 4, in the present invention, the movable body 1 winds the coil 9 toward the arm portion of the core 8 that is separated from the restraining body 2 first, that is, the first arm portion 8a. An example is shown.

In the restraining body 2, the second arm portion 8b of the core 8 is fixed to a stationary member (not shown) with pins 10 and 11, and in the movable body 1, the second arm portion 8b of the core 8 is fixed to a fixed member (not shown) of the yoke 6. A spacing coil spring 15 is hung on the closer portion. This coil spring 15 acts on the movable body 1 in a direction to separate the movable body 1 from the restraint body 2 with a force weaker than the attraction force due to the magnetic force of the permanent magnets 4 and 5. In addition,
Of course, the movable body 1 may be pivoted to the support 13 as shown in FIG. In FIG. 3, when the coil 9 is not energized, the permanent magnets 4 and 5 enter the yoke 6 through the first arm 8a of the core 8 as external magnetic foundations.

and an external magnetic path bo that enters the yoke 6 through the second arm portion 8b.
A line of magnetic force is generated that passes through two magnetic paths, and the attracting portion 7 is attracted to the first and second attracted portions 8c and 8d of the core 8. When the coil 9 is energized in this state, the coil 9
The suction target part 8c, the suction part 7, the second suction target part 8d, and the second suction target part 8c.
A line of magnetic force is generated that passes through the arm 8b and through the internal magnetic path co that enters the first arm 8a, and repulses the attracting portion 7 of the movable body 1 at the first attracted portion 8c. As a result, as shown in FIG. 4, the movable body 1 is released from the restraining body 2 first, with the first attracted part 8c, which is the one where the coil 9 is located, first.・Figure 5 shows
The relationship between the strength of the magnetic force of the electromagnet in the restraint body 2 and the amount of force required to separate the movable body 1 from the restraint body 2, that is, the strength of the coil spring 15 in a linear manner is shown.

Generally, when the magnetic force of the electromagnet is zero, the maximum pulling force is required, and as the magnetic force of the electromagnet becomes stronger, the pulling force needs to be reduced by 4. Even if the magnetic force increases as described above, a certain amount of separation force is required, and the minimum value of the magnetic force when this constant amount of separation force is achieved is considered to be a stable value. The smaller the stability value is, the more effective the device will be, and the less power it will consume. According to experiments, in the case of the conventional device shown in FIG. 1, the relationship between the strength of magnetic force and the separation force is as shown by the dotted curve X, and in the case of the conventional device shown in FIG. In the case of the device, the curve was as shown by the solid line X2. Looking at this, it can be seen that the stable value C of the magnetic force at the minimum separation force B shown by the curve X is the minimum separation force D shown by the curve X2.
, which is larger than the stable value E of the magnetic force at , and it was found that the device of the present invention is more effective and consumes less power. This is presumably because the leakage magnetic flux of the coil 9 effectively acts to separate the movable body 1 in the present invention. 6 and 7, in the present invention, a coil 9 is wound around the arm portion of the core 8 from which the movable body 1 is separated first, that is, the first arm portion 8a; The magnetic force of the permanent magnet 5 on the side of the coil 9 is set to be weaker than the magnetic force of the permanent magnet 4 on the side of the coil 9. It is biased toward the first adsorbed portion 8c of the wall, and
The ball fitting part 12 and the ball branch 14 of the support village 13 are connected to the movable body 1.
An example in which the end Ao of the contact part between the suction part 7 and the restraint body 2 on the side of the second suction target part 8d without the coil 9 is positioned on a substantially straight line Lo. It is shown.

According to the present invention, in which the magnetic force of the permanent magnet 6 on one side of the coil 9 is set to be weaker than the magnetic force of the permanent magnet 4 on the other side, it is further ensured that the movable body 1 separates from the coil 9. be able to.

In the figure, the permanent magnet 5 is shown to be smaller in size than the permanent magnet 4, but this is to make it easier to understand that the magnetic force of the permanent magnet 5 is weaker, and both permanent magnets 4
, 5, the objective can of course be achieved by making a difference in the amount of magnetization. According to the present invention, in which the sleeve part 12 of the movable body 1 that connects to the support punch 13 is biased toward the first attracted part 8c next to the coil 9 (see FIG. 6),
When the movable body 1 is separated from the restraining body 2 as shown in FIG. 7, the distance from the first attracted part 8c can be increased even if the rotation angle of the support member 13 is not very large. This allows the magnetic force of the electromagnet to be set to a smaller value. In this case, as shown in FIG. 8, the relationship between the pulling force and the magnetic force is experimentally determined as shown in FIG. The curve Y2 shown by the solid line shows the case where the bias is biased, and it has been found that both the magnetic force and the separation force are smaller in the case where the bias is biased according to the present invention. In addition, in the figure, B2 and D2 indicate a constant value of the pulling force in each case, and C2 and E2 indicate the stable value of the magnetic force at that time. The ball branch 14 of the support punch 13 is connected to the end of the contact area between the suction part 7 of the movable body 1 and the restraint body 2, which is the side of the second suction target part 8d where the coil 9 is not present (Fig. 6). According to the present invention, when the movable body 1 is separated from the restraint body 2 as shown in FIG. 7, the end portion Ao does not shift at all. The more accurate the operation of the device becomes.

In contrast, in conventional devices, as shown in FIG.
When the coil 9 is energized and the movable body 1 is separated, the end Ao of the contact portion when the coil 9 is not energized changes greatly as shown at point A in FIG. This indicates that the movable body 1 is stuck in a state where it is unable to separate from the restraint body 2, making the separating operation of the movable body 1 inaccurate. In addition, in FIG. 2 and FIG. 7, the chain line IA is
The position of the movable body 1 before separation is shown. 9 and 10 show that in the embodiment shown in FIGS. 6 and 7, the suction part 7 of the movable body 1 starts to separate from the left part, not from the right side in the figure. An example is shown.

Also in this example, all the setting conditions of the present invention shown in FIG. 6 are satisfied. Compared to the examples shown in FIGS. 6 and 7, the only difference is that the movable body 1 and the restraint body 2 are reversed left and right, and the support cup 13 is moved from the bottom to the top. It is. Therefore, detailed explanation thereof will be omitted. FIG. 11 shows a specific example of incorporating the device of the present invention shown in FIG. 6 into a camera.

In this case, the support punch 13 plays the role of a shutter closing member, and its reversing behavior is obtained by means of a torsion spring 16 saddled on the shaft 14. Working end 13 of support punch 13
a is opposed to a shutter opening/closing mechanism (not shown), and a charge village 17 is opposed to this working end 13a. The separation movement of the movable body 2 is received by a cushion portion 19 provided on the receiving surface 18a of the stopper 18, and the stopper 18 is fixed to a stationary member (not shown) with screws 20 and 21. There is. Initially, when the coil 9 is not energized and the movable body 1 is attracted to and restrained by the magnetic force of the permanent magnets 4 and 5, the working end 13a of the support member 13 is located at the dotted line position 13aA. When the coil 9 is energized and the movable body 1 moves away from the restraint body 2 to the position shown in the figure, it moves to the position shown by the solid line and performs a shutter closing operation. Further, the charge punch 17 moves to wind up the film and pushes the support village 13 back to the original dotted line position, and the movable body 1 is accordingly returned to the position where it is restrained by the restraint body 2. In the present invention, which of the movable body and the restraint body is a permanent magnet and which is an electromagnet can be arbitrarily selected at the design stage.

As described above, in the device of the present invention, the movable body always knows where the coil is and moves away from the restraint, so the separating action is quick and accurate. Also, many excellent effects have been obtained, such as the ability to easily adjust the force of the torsion spring 16 and the output of the electromagnet to be set small.

[Brief explanation of the drawing]

1 and 2 are plan views illustrating a conventional release-type electromagnet device and its operating mode, and FIGS. 3 and 4 show a release-type fly magnet device and its operation mode, which is an embodiment of the present invention. A plan view showing the operating mode, FIG. 5, shows the conventional device and the third and fourth devices.
6 and 7 are diagrams showing the relationship between the separation force and the strength of the magnetic force of the electromagnet for comparison with the device of the present invention shown in the figure. Fig. 8 is a plan view showing the type electromagnet device and its operating mode; Fig. 8 is a diagram showing the relationship between the pulling force and the strength of the magnetic force of the electromagnet for comparison between the follower device and the device of the present invention; Fig. 9 and the first
FIG. 0 is a plan view showing a release type electromagnet device and its operating mode as yet another embodiment of the present invention, and FIG. 11 is a plan view showing a specific example of incorporating the device of the present invention into a camera. 1...Movable body, 2...Restricted body, 4, 5...
Permanent magnet, 7... Adsorption part, 8... Core, 8a, 8b... First and second arm parts, 8c, 8d.
...First and second adsorbed parts, 9...Coil, 12...Shaft attachment part, 13...Support village, 14
...Axis support, 15... Coil spring for spacing, 16... Torsion spring for spacing, Ao...
End of the contact part, Lo... A straight line connecting the shaft attachment part, the shaft support, and the end of the contact part. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11

Claims (1)

[Claims] 1. A core having first and second arm portions located on the same side, a coil wound around the first arm portion, and arm ends of the both arm portions wrapped around the first arm portion. an electromagnet serving as a first and a second attracted part; a unipolar attracting part facing the first and second attracted parts of the electromagnet; The permanent magnet attracts the core, and the permanent magnet side is a movable body, and the electromagnet side is a restraint body that controls the operation of the movable body, and the movable body has an attraction force weaker than the magnetic force of the permanent magnet. The coil is wound in a direction that generates a magnetic force in the direction of repelling the permanent magnet on the first attracted part, and when the coil is energized. ,
A release type electromagnet device, wherein the movable body is released from the restraining body by moving away from the first attracted part first. 2. Wrapping a coil around the first arm of a core having first and second arm parts located on the same side, and wrapping the arm ends of the both arm parts in the first and second coverings, respectively. A permanent magnet having an electromagnet as an attraction part, and a single-polarity attraction part facing the first and second attraction parts of the electromagnet, and attracting the arm via the first and second attraction parts. The permanent magnet side is a movable body, and the electromagnet side is a restraining body that controls the operation of the movable body, and the movable body has a magnetic force that is weaker than the magnetic force of the permanent magnet and is spaced apart from the restraining body. The coil is wound in a direction in which a magnetic force in a direction that repels the permanent magnet is generated in the first attracted part, and the magnetic force in the attracted part of the permanent magnet is The electromagnet is set to be weaker on the side of the first attracted part where the coil is wound than on the side of the second attracted part where the coil is not wound, and when the coil is energized. . A release type electromagnet device, wherein the movable body is released from the restraining body by first moving away from the first attracted part. 3. A coil is wound around the first arm part of the core having first and second arm parts located on the same side, and the arm ends of the both arm parts are connected to the first and second arm parts, respectively. It has an electromagnet serving as a attracted part, and a single-polar attracting part facing the first and second attracted parts of the electromagnet, and attracts the core via the first and second attracted parts. The permanent magnet side is a movable body, and the electromagnet side is a restraint body that controls the operation of the movable body, and the movable body is swingably attached to one end of a rotatable support rod, and this support The rod is given a rotational habit that is weaker than the attraction force due to the magnetic force of the permanent magnet in a direction in which the movable body is separated from the restraint body, and
A shaft attachment portion of the movable body to the support rod is disposed to be biased toward a first attracted portion of the electromagnet, and the coil is configured such that:
The magnetic force in the direction of repelling the permanent magnet is generated in the first attracted part, and when the coil is energized, the movable body moves from the first attracted part first. A release type electromagnetic device that is released from the restraining body by moving away from the restraining body. 4. Wrapping a coil around the first arm of a core having first and second arm parts located on the same side, and wrapping the arm ends of the both arm parts in the first and second coverings, respectively. A permanent magnet having an electromagnet as an attraction part, and a single-polarity attraction part facing the first and second attraction parts of the electromagnet, and attracting the core via the first and second attraction parts. The permanent magnet side is a movable body, and the electromagnet side is a restraint body that controls the operation of the movable body, and the movable body is pivotally attached to one end of a rotatable support rod, and the support rod is is provided with a rotational behavior that is weaker than the attraction force due to the magnetic force of the permanent magnet in a direction to separate the movable body from the restraint body, and a pivoting portion of the movable body to the support rod; These are arranged so that the shaft support of the support rod is located substantially in a straight line with the end of the contact portion of the movable body and its restraining body, which is in contact with the second attracted part of the electromagnet. The coil is wound in a direction that generates a magnetic force in the direction of repelling the permanent magnet on the first attracted part, and when the coil is energized, the movable body moves the magnetic force toward the first attracted part. A release-type electromagnetic device that is released from the restraining body by separating from the opposite side first.