CN1740895A - Magnetic Aperture Adjuster - Google Patents

Abstract

The invention relates to a magnetic diaphragm regulator, which comprises a yoke iron shaped like a Chinese character 'ri', a first magnet, a second magnet, a coil, a shaft hole rod with a shaft hole, a light screen and a magnetic induction component, wherein the yoke iron is provided with a magnetic pole; the first magnet and the second magnet are respectively positioned in the first through hole and the second through hole of the yoke, the first magnet and the second magnet are arranged in a mode that the same polarities are opposite, the coil is formed by surrounding the track of the yoke, and the magnetic induction component is positioned on the shaft hole rod; when current exists in the coil, the coil makes circular motion by taking the shaft hole as the center of a circle due to the magnetic field effect of the first magnet and the second magnet, and then the shading plate is driven to perform the action of adjusting the size of the aperture; when no current flows in the coil, the magnetic force generated by the magnetic induction component drives the shading plate to return to a preset position.

Description

Magnetic Aperture Adjuster

technical field

The present invention relates to an aperture adjuster, in particular to a magnetic aperture adjuster which can be applied to an optical device and is driven by magnetic force and has the function of restoring force of a magnetic spring.

Background technique

In general optical devices, such as optical projectors, rear projection projectors or cameras, etc., there will be a device for controlling light, such as an aperture adjuster, which is used to adjust the intensity of light emitted from the optical device. It is used to generate image data with different brightness; among them, most of the aperture adjusters in the prior art are driven by power mechanisms, and some are driven by magnetic power. However, in the prior art, if the aperture adjuster is not in use, The visor can automatically return to a preset position, usually by means of a spring.

For example, a prior art magnetic aperture adjuster with elastic restoring force is shown in Figure 1A to Figure 1E, a magnetic aperture adjuster 1 includes a yoke 10, a first magnet 11, a first Two magnets 12, a coil 15, a light-shielding plate 16, a shaft hole rod 17 and a spring 18, wherein the yoke 10 is a rectangular body with a perforation 107, taking this prior art as an example, the yoke 10 It is composed of two "U"-shaped yoke iron blocks with their open ends facing each other, and the first magnet 11 and the second magnet 12 are located in the through hole 107 of the yoke iron 10, and are respectively fitted in the through hole 107 On the opposite side, the polarities of the first magnet 11 and the second magnet 12 are located at the two ends of the longer side respectively and are respectively staggered. In this example, the polar positions of the first magnet 11 and the second magnet 12 are as follows As shown in Figure 1C, the N pole of the first magnet 11 is located on the left side facing the coil 15, and its S pole is located on the right side facing the coil 15, and the polarity position of the second magnet 12 is just the same as that of the first magnet 12. Magnet 11 is opposite, and its N pole is positioned at the right side facing coil 15, and its S pole then is positioned at the left side facing coil 15, causes like this to face the magnetic field that the right side of coil 15 produces a direction upwards, and faces The left side of the coil 15 produces a magnetic field in a downward direction. The coil 15 is surrounded by an electric wire and is located between the first magnet 11 and the second magnet 12. A shaft hole rod 17 extends from one side of the coil. The shaft hole rod 17 includes a shaft hole 170, and the shaft hole 170 is pivotally connected to a shaft (not shown in the figure), and the light shield 16 is connected to the other side of the coil 15 relative to the shaft hole rod 17, and is usually arranged on On the light path of the optical device and perpendicular to the light path, in order to shield the light from advancing, a spring 18 is arranged on the shaft hole rod 17, and the two ends of the spring 18 are respectively fixed on any of the shaft hole rod 17 and the yoke 10. Location.

In order to further explain the structure and operation mode of the magnetic aperture adjuster 1 in the prior art, please refer to FIG. 1C to FIG. 1E at the same time. When a current flows in the coil 15, its current direction is as shown in the thick black arrow in FIG. 1D As shown, taking the upper side of the coil 15 in FIG. 1D as an example, since the current flows from the right to the left, and the magnetic field shoots out of the paper from the bottom vertically, according to the right-hand Ampere’s law, the coil 15 will generate an upward force Since one side of the coil 15 is connected to the shaft hole rod 17, and its shaft hole 170 is pivotally connected to a shaft (not shown in the figure), the coil 15 as a whole is forced to take the shaft hole 170 as the center of the circle along the A-A' section. Counterclockwise circular motion, its counterclockwise circular motion direction is shown by the hollow arrow in Figure 1D; take the lower side of the coil 15 in Figure 1D as an example, since the current flows from the left to the right, and the magnetic field is from the top Injecting vertically downward into the paper surface, according to the right-hand Ampere's law, the coil 15 will also generate an upward force. Due to the relationship between the shaft hole 170, the coil 15 as a whole is forced to take the shaft hole 170 as the center of the circle along the A-A' section. Counterclockwise circular movement, and its counterclockwise circular movement direction is also shown by the hollow arrow in Figure 1D. In this way, the coil 15 will simultaneously drive the visor 16 to perform counterclockwise circular movement along the A-A' section with the shaft hole 170 as the center of the circle Please refer to FIG. 1E, if the current in the coil 15 is accurately adjusted, the angle of the circular motion of the coil 15 can be controlled, so that the visor 16 can adjust the size of the aperture.

When there is no current flowing through the coil 15, the magnetic field between the coil 15 and the first magnet 11 and the second magnet 12 does not have any magnetic induction effect. At this time, since the spring 18 is stretched, an elastic restoring force will be generated. At the same time, due to the relationship of the shaft hole 170, the coil 15 as a whole is forced to make a clockwise circular motion along the A-A' section with the shaft hole 170 as the center, and the clockwise circular motion direction is also shown by the hollow arrow in Figure 1E, The spring 18 can pull the coil 15, the shaft hole rod 17 and the light shielding plate 16 back to their original preset positions.

However, such a magnetic aperture adjuster basically has the following disadvantages. One is that the structure of such a coil is complicated, it is not easy to manufacture and the production cost is high; Uniformity makes the relative relationship between the amount of current in the coil and the circular motion of the coil complicated, making it difficult to control; secondly, in order to achieve sufficient actuation capability, such a magnetic aperture adjuster usually has a large volume, especially its width cannot be reduced ;In addition, the spring is used as the restoring force of the aperture adjuster, because the elastic restoring force of the spring will change with the stretching degree of the spring, that is to say, the greater the stretching degree of the spring, the greater the restoring force of the spring. This makes it difficult to control the restoring force of the spring. In addition, the spring itself has a lifespan problem. When the spring is stretched for a long time, the spring will lose its original restoring force. These problems make the designers of optical devices very troublesome.

Contents of the invention

The purpose of the present invention is to provide a magnetic aperture adjuster, its special magnetic actuation structure can provide more efficient actuation capability, and at the same time, the magnetic force provided by its magnetic sensing component can be used as the light shield of the aperture adjuster The recovery force overcomes the shortcomings of the existing magnetic aperture adjuster.

The magnetic aperture adjuster of the present invention is applied to an optical device, and it includes: a yoke, which includes a first through hole and a second through hole, so that the yoke forms an outer frame and a "day" composed of a track. "" shape, wherein the track is located between the first through hole and the second through hole, and its cross section can be arc-shaped, rectangular or polygonal; a first magnet is located in the first through-hole and attached to the inner side of the outer frame; A second magnet is located in the second through hole and attached to the inner side of the outer frame, and the first magnet and the second magnet are arranged opposite to each other with the same polarity, wherein the cross section of the first magnet and the second magnet can be circular arc ring , rectangular or polygonal ring; a coil is formed by a wire surrounding the track, a shaft hole rod extends from one side, and the shaft hole rod contains a shaft hole; a light shield is connected to the coil relative to the The other side of the shaft hole; a magnetic induction component is located outside the track and connected to one side of the coil; wherein, when there is current flowing in the coil, the coil is induced by the magnetic field of the first magnet and the second magnet, so that the coil moves along the The reciprocating movement along the track enables the shading plate to adjust the size of the aperture; when there is no current flowing in the coil, the magnetic force generated by the magnetic sensing component will drive the shading plate to return to a preset position.

According to the above idea, the magnetic sensing component of the present invention is a third magnet. The magnetic sensing component is subjected to the magnetic attraction and magnetic repulsion of the track to generate magnetic force, and then drives the visor to return to the preset position.

According to the above idea, the magnetic sensing component of the present invention is a third magnet, and the magnetic sensing component is subjected to the magnetic attraction force or magnetic repulsion force of a fourth magnet to generate magnetic power, and then drive the visor to return to the preset position; wherein, The fourth magnet is located on the yoke.

According to the above idea, the magnetic sensing component of the present invention is a metal block, and the magnetic sensing component is subjected to the magnetic attraction force of a fourth magnet to generate magnetic force, and then drives the visor to return to the preset position; wherein, the fourth magnet is located at On the yoke.

According to the above idea, the yoke iron of the present invention is composed of two L-shaped yoke iron plates and a ㄇ-shaped yoke iron plate, wherein the two L-shaped yoke iron plates are arranged with the longer sides attached to each other and mirrored to form a track and one side of the outer frame, while the ㄇ-shaped yoke iron plates form the other three sides of the outer frame.

According to the above idea, the yoke iron of the present invention is composed of two ㄇ-shaped yoke iron plates and a flat yoke iron plate, wherein the sides of the two ㄇ-shaped yoke iron plates are attached to each other and mirrored each other, and at the same time the opening Face the same direction to form the three sides of the track and the outer frame, and the flat yoke iron plate is used to form the other side of the outer frame.

According to the above idea, the magnetic diaphragm adjuster of the present invention can be applied to optical devices such as optical projectors, rear projection projectors and cameras.

Description of drawings

FIG. 1A is a three-dimensional schematic diagram of a conventional magnetic aperture adjuster.

FIG. 1B is a three-dimensional schematic diagram of another angle of the conventional magnetic aperture adjuster.

FIG. 1C is a schematic front view of a conventional magnetic aperture adjuster.

FIG. 1D is a schematic cross-sectional view along line A-A' in FIG. 1C.

FIG. 1E is a schematic cross-sectional view along line A-A' in FIG. 1C when the light-shielding sheet is in the action of adjusting the size of the aperture.

FIG. 2A is a three-dimensional schematic view of the magnetic aperture adjuster according to the first embodiment of the present invention.

2B is a schematic perspective view of another angle of the magnetic aperture adjuster according to the first embodiment of the present invention.

FIG. 2C is a schematic front view of the magnetic aperture adjuster according to the first embodiment of the present invention.

FIG. 2D is a schematic cross-sectional view along line B-B' in FIG. 2C.

FIG. 2E is a schematic cross-sectional view along the line A-A' in FIG. 2C when the light-shielding plate performs the action of adjusting the size of the aperture.

FIG. 2F is a schematic cross-sectional view along the line A-A' in FIG. 2C when the magnetic spring makes the visor return.

FIG. 2G is a schematic cross-sectional view of a detailed structure of a magnetic spring actuation method along the line A-A' in FIG. 2C .

FIG. 2H is a schematic cross-sectional view of another magnetic spring actuation method along the line A-A' in FIG. 2C .

FIG. 2I is a schematic cross-sectional view of another magnetic spring actuation method along the line A-A' in FIG. 2C .

FIG. 2J is a schematic cross-sectional view of another magnetic spring actuation method along the line A-A' in FIG. 2C .

FIG. 3 is a schematic perspective view of a magnetic aperture adjuster according to a second embodiment of the present invention.

FIG. 4 is a schematic perspective view of a magnetic aperture adjuster according to a third embodiment of the present invention.

FIG. 5 is a three-dimensional schematic diagram of a magnetic aperture adjuster according to a fourth embodiment of the present invention.

FIG. 6A is a schematic cross-sectional view of a combination of a yoke, a first magnet and a second magnet of the magnetic diaphragm adjuster of the present invention.

FIG. 6B is a cross-sectional view showing the combination of the yoke, the first magnet and the second magnet of another magnetic aperture adjuster of the present invention.

FIG. 6C is a cross-sectional view showing the combination of the yoke, the first magnet and the second magnet of another magnetic aperture adjuster of the present invention.

FIG. 6D is a cross-sectional schematic diagram of another combination of the yoke, the first magnet and the second magnet of the magnetic diaphragm adjuster of the present invention.

Detailed ways

Please refer to Fig. 2A to Fig. 2F for the first embodiment of the present invention, as shown in the figure, the magnetic aperture adjuster 2 of the first embodiment of the present invention comprises: a yoke 20, a first magnet 21, a second magnet 22. A coil 25, a shading plate 26, a shaft hole rod 27, a third magnet 23, etc.; wherein the yoke 20 includes a first perforation 207 and a second perforation 208, so that the yoke 20 becomes an outer frame 201 And a combination of a track 200, wherein the track 200 is located between the first through hole 207 and the second through hole 208, its relative relationship is shown in Figure 2C, the front view of the overall yoke 20 is like a "day" shape; The first magnet 21 and the second magnet 22 are located in the first through hole 207 and the second through hole 208 respectively, and are attached to the inner side of the outer frame respectively, and the first magnet 21 and the second magnet 22 are arranged in the same polarity opposite manner , taking the present embodiment as an example, please refer to Fig. 2C, the N pole of the first magnet 21 is downward and the S pole is upward, the N pole of the second magnet 22 is upward and opposite to the N pole of the first magnet 21, and the second magnet 22 Therefore, a magnetic field from top to bottom is formed in the first through hole 207, and a magnetic field from bottom to top is formed in the second through hole 208, if the shape of the first magnet 21 and the second magnet 22 Equal in size, the above-mentioned two magnetic field sizes will also be equal. The above-mentioned setting can also be implemented if the polarities of the first magnet 21 and the second magnet 22 are completely opposite; 27 extends from one side of the coil 25. Preferably, the shaft hole rod 27 is perpendicular to the track 200, wherein the shaft hole rod 27 includes a shaft hole 270, which is pivotally connected to a shaft hole 270 as in the prior art. shaft (not shown in the figure); the shading plate 26 is connected to the other side of the coil 25 relative to the shaft hole 270, and is usually also arranged on the light path of the optical device, and the moving direction of the shading plate 26 is related to the light path They are perpendicular to each other and are used to shield the light from advancing, and the shape of the shading plate 26 is not limited thereto, any one that can shield the light from advancing can be used; the third magnet 23 is located on the shaft hole rod 27, please refer to FIG. 2B Shown, but this arrangement is not limited to this, if the third magnet 23 is arranged on the light-shielding plate 26, it can also be implemented.

In order to further explain the structure and operation mode of the magnetic aperture adjuster 2 of the first embodiment, please refer to FIG. 2C to FIG. 2F at the same time; As shown by the thick black arrow in Figure 2D, please refer to Figure 2D again, because the current on the upper side of the coil 25 flows from left to right, while the direction of the magnetic field is from top to bottom, according to the right-hand Ampere's law, the coil 25 will generate The force in the direction of the paper surface; and the lower side of the coil 25 because its current flows from right to left, while the direction of the magnetic field is from bottom to top, according to the right-hand Ampere's law, the coil 25 will also generate a force entering the direction of the paper, and the coil 25 will Move along the A-A' section, moreover, the coil 25 is connected with the shaft hole rod 27, and its shaft hole 270 is pivotally connected to a shaft (not shown in the figure), so that the coil 25 as a whole is forced to take the shaft hole 270 as the center of the circle along the Make counterclockwise circular movement along the A-A' section, and its movement direction is shown in the direction of the hollow arrow in Figure 2E. In this way, the coil 25 will therefore drive the light shielding plate 26 to make a counterclockwise circular movement along the A-A' section with the shaft hole 270 as the center. If the amount of current in the coil 25 is accurately adjusted, the angle of the circular motion of the coil 25 can be controlled, so that the shading plate 26 can adjust the size of the aperture.

If there is no current flowing in the coil 25, please refer to FIG. 2F. Since the track 200 is induced by the magnetic fields of the first magnet 21 and the second magnet 22, according to this embodiment, the track 200 is induced to become an S pole. If the three magnets 23 are arranged on the shaft hole rod 27, the positions of the N pole and the S pole are as shown in FIG. The relationship of a shaft (not shown in the figure) makes the shaft hole rod 27 be forced to make a clockwise circular motion along the A-A' section with the shaft hole 270 as the center, and the clockwise circular motion direction is shown by the hollow arrow in Figure 2F , the shaft hole rod 27 will drive the coil 25 and the light shielding plate 26 to make a clockwise circular movement, so that the light shielding plate 26 will return to the preset position.

The above-mentioned combination of the third magnet 23 and the track 200 can produce the effect of making the third magnet 23 perform a clockwise circular motion, and the whole group of structures can be called "magnetic spring", which means "magnetic spring", and The third magnet 23 is one of the magnetic sensing components, however, the magnetic spring actuation method of the present invention is not limited thereto, and several possible implementation methods are listed below.

Please refer to Fig. 2G, this figure is along the A-A' line in Fig. 2C, a schematic cross-sectional view of the detailed structure of a magnetic spring actuation mode, a third magnet 23 shown in the figure is a rod 27 embedded in the shaft hole On the side, its S pole is towards the outside of the shaft hole rod 27, and its N pole is towards the shaft hole rod 27. In this way, since the track 200 is induced to become the relationship of the S pole, the S pole of the third magnet 23 will be received by the track 200. At the same time, the N pole of the third magnet 23 is subjected to the magnetic attraction force of the track 200, and because the shaft hole 270 is pivotally connected to a shaft (not shown in the figure), the third magnet 23 is produced by the magnetic induction of the track 200 The magnetic power will drive the shaft hole rod 27 to produce a clockwise circular motion, and the direction of its clockwise circular motion is shown by the hollow arrow in Figure 2G. This implementation mode is the detailed technology stated in the above-mentioned first embodiment of the present invention .

Please refer to FIG. 2H for another embodiment of magnetic spring action. A third magnet 23 shown in the figure is also embedded on one side of the shaft hole rod 27, and its S pole faces the outside of the shaft hole rod 27, while Its N pole is towards the shaft hole rod 27, wherein, an inner side of the yoke 20 is provided with a fourth magnet 24, and the polarity of the fourth magnet 24 is set relative to the third magnet 23, as shown in Figure 2H, the fourth magnet 24 Be positioned at the inboard end of the upper side of the yoke 20, its S pole is arranged downwards, and its N pole is arranged upwards, like this, the S pole of the third magnet 23 is just opposite to the S pole of the fourth magnet 24, so the third magnet 23 can be made The magnet 23 senses a magnetic repulsion force, which provides the third magnet 23 with a magnetic force, and also causes the shaft hole rod 27 to generate a clockwise circular motion, and the direction of the clockwise circular motion is shown by the hollow arrow in FIG. 2H; similarly, Please refer to Fig. 2I, if the fourth magnet 24 is positioned at the inner end of the side below the yoke 20, its S pole is arranged upwards, and its N pole is arranged downwards, so that the N pole of the third magnet 23 is just opposite to the fourth magnet 23. The S pole of the magnet 24 can make the third magnet 23 sense a magnetic attraction force, provide the magnetic force as the third magnet 23, and also make the shaft hole rod 27 produce a clockwise circular motion.

Please refer to FIG. 2J for another embodiment of magnetic spring actuation. As shown in the figure, a metal block 29 is embedded on one side of the shaft hole rod 27, and a fourth magnet 24 is arranged on the lower side of the yoke 20. At an inner side end of the side, the metal block 29 will be subjected to the magnetic induction of the fourth magnet 24 to generate a magnetic attraction force, which can also cause the shaft hole rod 27 to generate a clockwise circular motion.

From the description of the magnetic aperture adjuster in the above-mentioned embodiment, it can be seen that due to the design of the track of the magnet and the yoke, the magnetic field generated by the magnet is evenly distributed, and because of the design of the coil surrounding the track, the upper side of the coil is in contact with the track. Both the lower side can be induced by the magnetic field to produce an actuation effect. The upper side and the lower side of the coil of the present invention occupy most of the coil. Compared with the prior art, in the case of the same coil turns and area At the same time, the present invention sets a magnetic induction component, which can use the magnetic induction of the track to generate the restoring force required by the shading plate of the aperture adjuster, so that the shading plate can return to the preset position when it is not in use. Set the position; in the above-mentioned first embodiment of the present invention, since its track itself along the A-A' cross-sectional shape is an arc ring, the magnetic field generated by it is relative to the magnetic sensing assembly located on the shaft hole rod , no matter what the position of the magnetic sensing component is, the magnetic spring restoring force generated by it is a certain value, which can make it easy for the designer of the aperture adjuster to plan and design the magnitude of the magnetic spring restoring force, so that the shading plate will not be damaged due to improper design. Structural damage occurs during recovery.

Please refer to Fig. 3 for the second embodiment of the present invention, as shown in the figure, the magnetic diaphragm adjuster 3 of the second embodiment of the present invention also includes: a yoke 30, a first magnet 31, a second magnet 32, A coil 35, a shaft hole rod 37 with a shaft hole 370, a light shielding plate 36 and a third magnet 23, the relative positions and functions of the components are roughly the same as those of the first embodiment, the difference lies in the first embodiment of the present embodiment. The cross-sectional shape of the magnet 31 and the second magnet 32 is designed to be a circular arc ring. What's more, the first magnet 31 and the second magnet 32 can even be designed as a polygonal ring (not shown in the figure). The so-called polygonal ring is When the circular arc edge of the arc ring is discontinuous, preferably, the shape and size of the first magnet 31 and the second magnet 32 are the same. The coil 35 will not be worn out due to the contact with the track 300 due to rotation, and the coil 35 as a whole will not move away from the magnetic field range of a first magnet 31 and a second magnet 32, so that the coil 45 is induced during the movement. The magnetic fields are all the same, and the advantages of the above design can make the current of the coil 35 linearly proportional to the circular motion angle of the coil 35, so that the performance of the magnetic aperture adjuster 3 of this embodiment can more easily reach the expected value of the design.

Please refer to Fig. 4 for the third embodiment of the present invention. As shown in the figure, the magnetic aperture adjuster 4 of this embodiment also includes: a yoke 40, a first magnet 41, a second magnet 42, and a coil 45 1. A shaft hole rod 47 with a shaft hole 470, a light-shielding plate 46 and a third magnet 43, the relative position and effect of its components are roughly the same as those of the second embodiment, the difference lies in the first magnet 41 of this embodiment, The cross-sectional shape of the second magnet 42 and the track 400 can also be designed as a rectangle, which also has the effects as mentioned in the first embodiment of the present invention.

Please refer to Fig. 5 for the fourth embodiment of the present invention. As shown in the figure, the magnetic aperture adjuster 5 of this example also includes: a yoke 50, a first magnet 51, a second magnet 52, a coil 55, A shaft hole rod 57 with a shaft hole 570, a light-shielding plate 56 and a third magnet 53, the relative position and effect of its components are roughly the same as those of the first embodiment, except that the first magnet 51 and the third magnet of this embodiment are different. A second magnet 52 is located in the first through hole 507 and the second through hole 508 and is attached to both sides of the track 500 respectively, and the first magnet 51 and the second magnet 52 are also arranged in the same polarity opposite manner, wherein In this embodiment, the N pole of the first magnet 51 is downward and the S pole is upward, the N pole of the second magnet 52 is upwardly opposite to the N pole of the first magnet 51, and the S pole of the second magnet 52 is downward , Therefore, a magnetic field from top to bottom is formed in the first through hole 507, and a magnetic field from bottom to top is formed in the second through hole 508. Similarly, if the shapes and sizes of the first magnet 51 and the second magnet 52 are equal , the magnitudes of the above two magnetic fields will also be equal; and the coil 55 of this embodiment is formed around the track 500, the first magnet 51 and the second magnet 52, and the detailed action mode will be similar to that of the first embodiment. No need to go into details here, wherein, the third magnet 53 is the same as the third magnet 23 in the first embodiment, so that the magnetic diaphragm adjuster 5 has the function of magnetic restoring force.

The front view of the yoke in each of the above-mentioned embodiments is roughly in the shape of a "day". For the convenience of manufacture, the yoke can be composed of several yoke plates; for example, the yoke 20 in the first embodiment, for illustration For convenience, please refer to Fig. 6A, the yoke 20 is composed of two L-shaped yoke plates 202, 202' and a ㄇ-shaped yoke plate 203, wherein the two L-shaped yoke plates 202, 202' are longer The sides are attached to each other and mirrored, and the longer sides are attached to each other to form the track 200, and the other side of the L-shaped yoke iron plate 202, 202' forms one side of the outer frame 201, and the ㄇ-shaped yoke iron plate 203 Then form the other three sides of the outer frame 201 to form a "day"-shaped yoke 20. In this way, during the manufacturing process, two L-shaped yoke plates 202, 202' can be laminated and mirrored. After setting, the coil can be put into the track 200 , and then the U-shaped yoke plate 203 is connected with the two L-shaped yoke plates 202 , 202 ′ to complete the manufacture of the yoke 20 .

Another embodiment of the yoke 20 is shown in FIG. 6B. The shorter sides of the L-shaped yoke plates 202, 202′ can extend to the edge of the outer frame 201 of the coil 20, and then the ㄇ-shaped yoke plates 203 is connected with the inner edges of the two L-shaped yoke plates 202 and 202 ′ to complete the manufacture of the yoke 20 .

Another embodiment of the yoke 20 is shown in FIG. 6C. The yoke 20 is composed of two ㄇ-shaped yoke plates 204, 204′ and a flat yoke plate 205, wherein the two ㄇ-shaped yoke plates 204, 204 ′ is arranged by mirroring the longer sides to fit each other, and at the same time, the opening faces the same direction, wherein, the side that fits each other forms the track 200, thus forming the track 200 and the three sides of the outer frame 201, and finally, The flat yoke iron plate 205 is arranged on the open end of the ㄇ-shaped yoke iron plate 204, 204' to form the other side of the outer frame 201, and a "day"-shaped yoke iron 20 can be formed; the flat yoke iron plate 205 It can extend to the edge of the outer frame 201 of the coil 20, as shown in FIG. 6C, or it can be retracted to the inner edge of the other side of the side of the ㄇ-shaped yoke iron plates 204, 204' that are attached to each other, as shown in FIG. As shown in FIG. 6D , a Japanese-shaped yoke 20 can also be manufactured. Of course, the concept of the present invention is not limited thereto, and these are just several implementations of making a "Japanese"-shaped yoke 20 .

The above descriptions are only preferred embodiments of the present invention. The above embodiments are only used to illustrate but not to limit the scope of the present invention. The scope of the present invention is defined by the scope of the following claims of the present application. All equivalent changes or substitutions made according to the scope of the claims of the present application shall fall within the scope of the present invention.

Claims (24)

1. Magnetomotive iris aperture regulator, it comprises:

One yoke, it comprises one first perforation and one second perforation, so that this yoke forms a housing and a track, wherein this track is between this first perforation and this second perforation;

One first magnet is positioned at this first perforation and close this housing place;

One second magnet is positioned at this second perforation and close this housing place;

One coil is to form around this track with a staple for electric wire;

One shadow shield is connected in a side of this coil;

One sense magnetic assembly is positioned at the outer of this track and is connected in a side of this coil;

Wherein, when in this coil current flowing being arranged, this coil is subjected to the magnetic field induction of this first magnet and this second magnet, makes this coil reciprocating along this track, so that this shadow shield is regulated the action of aperture size; When not having current flowing in this coil, the magnetomotive that this sense magnetic assembly is produced will drive this shadow shield and return back to a predeterminated position.

2. Magnetomotive iris aperture regulator as claimed in claim 1, it is characterized in that described sense magnetic assembly is to be one the 3rd magnet, this sense magnetic assembly is to be subjected to the magnetic induction of this track and to produce magnetomotive, and then drive this shadow shield and return back to this predeterminated position, wherein said magnetic induction comprises magnetic attraction and magnetic repulsion.

3. Magnetomotive iris aperture regulator as claimed in claim 1, it is characterized in that described sense magnetic assembly is to be one the 3rd magnet, this sense magnetic assembly is to be subjected to being positioned at the magnetic induction of one the 4th magnet on this yoke and to produce magnetomotive, and then drive this shadow shield and return back to this predeterminated position, wherein said magnetic induction is to be magnetic attraction or magnetic repulsion.

4. Magnetomotive iris aperture regulator as claimed in claim 1, it is characterized in that described sense magnetic assembly is to be a derby, this sense magnetic assembly is to be subjected to being positioned at the magnetic induction of one the 4th magnet on this yoke and to produce magnetomotive, and then drive this shadow shield and return back to this predeterminated position, wherein said magnetic induction is to be magnetic attraction.

5. Magnetomotive iris aperture regulator as claimed in claim 1 is characterized in that this track is to be selected from following shape along the section shape of the direction of motion of coil: circular arc annular, rectangle and polygon annular.

6. Magnetomotive iris aperture regulator as claimed in claim 1, it is characterized in that this first magnet is to fit in this first perforation and with this housing is inboard, and this second magnet is to fit in this second perforation and with this housing is inboard, and this first magnet and this second magnet are to be oppositely arranged with identical polar, and this first magnet is identical with size with the shape of this second magnet.

7. Magnetomotive iris aperture regulator as claimed in claim 1 is characterized in that this first magnet and this second magnet are to be selected from following shape respectively along the section shape of the direction of motion of coil: circular arc annular, rectangle and polygon annular.

8. Magnetomotive iris aperture regulator as claimed in claim 1 is characterized in that this sense magnetic assembly is to be positioned on this shadow shield.

9. Magnetomotive iris aperture regulator as claimed in claim 1, it is characterized in that also comprising an axis hole bar, the opposite side with respect to this shadow shield from this coil extends, this axis hole bar comprises an axis hole, when in this coil current flowing being arranged, this coil is the magnetic field induction that is subjected to this first magnet and this second magnet, making this coil is that circular motion is made along this track in the center of circle with this axis hole, so that this shadow shield is regulated the action of aperture size, wherein this axis hole bar is vertical mutually with this track, and wherein this sense magnetic assembly is to be positioned on this axis hole bar.

10. Magnetomotive iris aperture regulator as claimed in claim 1, it is characterized in that this yoke is made up of two L shaped yoke plates and a ㄇ shape yoke plate, wherein this L shaped yoke plate mirror is provided with, and forming a side of this track and this housing, and this ㄇ shape yoke plate forms other three sides of this housing.

11. Magnetomotive iris aperture regulator as claimed in claim 1, it is characterized in that this yoke is made up of two ㄇ shape yoke plates and a flat yoke plate, wherein a side of this ㄇ shape yoke plate is fitted and mirror setting mutually mutually, and simultaneously with opening surface to same direction, forming three sides of this track and this housing, and this flat yoke plate is in order to form an other side of this housing.

12. Magnetomotive iris aperture regulator as claimed in claim 1 is characterized in that this Magnetomotive iris aperture regulator is applied on the optical devices, wherein said optical devices are for one of following: optical projector, back projecting projector and camera.

13. a Magnetomotive iris aperture regulator, it comprises:

One yoke, it comprises one first perforation and one second perforation, so that this yoke forms a housing and a track, wherein this track is between this first perforation and this second perforation;

One first magnet is positioned at this first perforation and side of this track of fitting;

One second magnet is positioned at this second perforation and opposite side of this track of fitting;

One coil is to form around this track, this first magnet and this second magnet simultaneously with an electric wire;

One shadow shield is connected in a side of this coil;

One sense magnetic assembly is positioned at the outer of this track and is connected in a side of this coil;

Wherein, when in this coil current flowing being arranged, this coil is subjected to the magnetic field induction of this first magnet and this second magnet, makes this coil reciprocating along this track, so that this shadow shield is regulated the action of aperture size; When not having current flowing in this coil, the magnetomotive that this sense magnetic assembly is produced will drive this shadow shield and return back to a predeterminated position.

14. Magnetomotive iris aperture regulator as claimed in claim 13, it is characterized in that described sense magnetic assembly is to be one the 3rd magnet, this sense magnetic assembly is subjected to the magnetic induction of this track and produces magnetomotive, and then drive this shadow shield and return back to this predeterminated position, wherein said magnetic induction comprises magnetic attraction and magnetic repulsion.

15. Magnetomotive iris aperture regulator as claimed in claim 13, it is characterized in that described sense magnetic assembly is to be one the 3rd magnet, this sense magnetic assembly is subjected to being positioned at the magnetic induction of one the 4th magnet on this yoke and produces magnetomotive, and then drive this shadow shield and return back to this predeterminated position, wherein, the 4th magnet is to be positioned on this yoke, and described magnetic induction is to be magnetic attraction or magnetic repulsion.

16. Magnetomotive iris aperture regulator as claimed in claim 13, it is characterized in that described sense magnetic assembly is to be a derby, this sense magnetic assembly is subjected to being positioned at the magnetic induction of one the 4th magnet on this yoke and produces magnetomotive, and then drive this shadow shield and return back to this predeterminated position, wherein said magnetic induction is to be magnetic attraction.

17. Magnetomotive iris aperture regulator as claimed in claim 13 is characterized in that this track is to be selected from following shape along the section shape of the direction of motion of coil: circular arc annular, rectangle and polygon annular.

18. Magnetomotive iris aperture regulator as claimed in claim 13 is characterized in that this first magnet and this second magnet are to be selected from following shape respectively along the section shape of the direction of motion of coil: circular arc annular, rectangle and polygon annular.

19. Magnetomotive iris aperture regulator as claimed in claim 13 is characterized in that this first magnet and this second magnet are to be oppositely arranged with identical polar, this first magnet is identical with size with the shape of this second magnet.

20. Magnetomotive iris aperture regulator as claimed in claim 13 is characterized in that this sense magnetic assembly is to be positioned on this shadow shield.

21. Magnetomotive iris aperture regulator as claimed in claim 13, it is characterized in that also comprising an axis hole bar, the opposite side with respect to this shadow shield from this coil extends, this axis hole bar comprises an axis hole, when in this coil current flowing being arranged, this coil is the magnetic field induction that is subjected to this first magnet and this second magnet, making this coil is that circular motion is made along this track in the center of circle with this axis hole, so that this shadow shield is regulated the action of aperture size, in this axis hole bar vertical mutually with this track, and this sense magnetic assembly is to be positioned on this axis hole bar.

22. Magnetomotive iris aperture regulator as claimed in claim 13, it is characterized in that this yoke is made up of two L shaped yoke plates and a ㄇ shape yoke plate, wherein this L shaped yoke plate mirror is provided with, and forming a side of this track and this housing, and this ㄇ shape yoke plate forms other three sides of this housing.

23. Magnetomotive iris aperture regulator as claimed in claim 13, it is characterized in that this yoke is made up of two ㄇ shape yoke plates and a flat yoke plate, wherein a side of this ㄇ shape yoke plate is fitted and mirror setting mutually mutually, and simultaneously with opening surface to same direction, forming three sides of this track and this housing, and this flat yoke plate is in order to form an other side of this housing.

24. Magnetomotive iris aperture regulator as claimed in claim 13 is characterized in that this Magnetomotive iris aperture regulator is applied on the optical devices, wherein said optical devices are for one of following: optical projector, back projecting projector and camera.

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