Adsorption device, electronic machine

Abstract

To switch between a state in which an adsorber exhibits a sufficient adsorbing power and a state in which the adsorber reduces the influence of a magnetic field to the outside.SOLUTION: An adsorber 200 has an adsorbing surface Y that adsorbs a magnetic substance 300 by a magnetic force. A permanent magnet 32 moves relatively to a first magnetic member 24 to cause the adsorber 200 to make a transition to a first state and a second state. When seen from a direction perpendicular to the adsorbing surface Y, in the second state, the permanent magnet 32 and the first magnetic member 24 have an overlapping area, and in the first state, the permanent magnet 32 and the first magnetic member 24 do not overlap each other.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present invention relates to an adsorption device and an electronic device. Background Art

[0002] Adsorption devices that magnetically adsorb to magnetic bodies, and electronic devices provided with such adsorption devices are known. For example, a camera as such an electronic device can be fixed to various heights and locations by magnetic force, enabling photographing of images with various compositions.

[0003] Sufficient magnetic force is required to stably fix a camera. On the other hand, if magnetic force constantly acts on the outside of the camera, there are concerns, for example, when the camera is carried in a bag, about the influence of the magnetic field on magnetic recording cards such as credit cards and the adhesion of magnetic bodies such as keychains. Therefore, mechanisms capable of switching magnetic force ON / OFF (or between strong and weak states) have been proposed.

[0004] For example, Patent Document 1 discloses a method of switching, via movement of a magnet, an attachment that can be attached to a camera by magnetic force between a state attached to the camera and a state detached from the camera. In Patent Document 1, the attachment includes a movable magnetic body movably built into the device body on the mounting surface side, and a first adsorbing material that adsorbs the movable magnetic body to the side opposite to the mounting surface side. When the attachment is not mounted, the movable magnetic body is adsorbed to the side opposite to the mounting surface side by the first adsorbing material; when the attachment is mounted, the movable magnetic body is adsorbed to a second adsorbing material provided on the mounting surface of the device body.

[0005] Further, Patent Document 2 discloses an adsorption device for factories that switches adsorption force when conveying components or holding assembly processing equipment at manufacturing sites. In Patent Document 2, the magnitude of adsorption force is switched by moving a magnetic cylinder vertically relative to a magnet to change the relative position between the magnet and the magnetic body. Prior Art Documents Patent Documents

[0006] [Patent Document 1] Japanese Patent Publication No. 2013-37163 [Patent Document 2] Japanese Patent Publication No. 2012-250323 [Overview of the project] [Problems that the invention aims to solve]

[0007] However, when the adsorption device is fixed to a magnetic material, sufficient adsorption force is required, and when the device is not fixed, such as when it is being carried, the influence of the external magnetic field must be sufficiently suppressed. There was room for improvement in achieving both of these conditions.

[0008] The present invention aims to switch between a state that exhibits sufficient adsorption force and a state that reduces the influence of external magnetic fields. [Means for solving the problem]

[0009] To achieve the above objective, the present invention provides an adsorption device having an adsorption surface that is attracted to a magnetic material by magnetic force, comprising a magnetic member and a moving relative to the magnetic member Possible magnet Force generating member and The device comprises a fixing member having a guide groove for fixing the magnetic member, a holding member having an engaging portion that engages with the guide groove for holding the magnetic force generating member, and an operating member that engages with the engaging portion. When the operating member is operated, the engaging portion moves along the guide groove, causing the magnetic force generating member to move relative to the magnetic member, and the adsorption device transitions between a first state and a second state. When viewed from a direction perpendicular to the adsorption surface, the second state has an overlapping region between the magnetic member and the magnetic force generating member, while the first state is characterized in that, compared to the second state, the overlapping region between the magnetic member and the magnetic force generating member is smaller, or the magnetic member and the magnetic force generating member do not overlap. [Effects of the Invention]

[0010] According to the present invention, it is possible to switch between a state in which sufficient adsorption force is exerted and a state in which the influence of the external magnetic field is reduced. [Brief explanation of the drawing]

[0011] [Figure 1] This is an external view of an electronic device. [Figure 2]This is a perspective view of the adsorption device. [Figure 3] This is a disassembled perspective view of the adsorption device. [Figure 4] This diagram shows an unfolded view of the inner surface of the operating member, an unfolded view of the cylindrical part of the guide member, a diagram showing the inner surface, cylindrical part, and guide pin superimposed, and an unfolded view of the cylindrical part of the guide member in a modified example. [Figure 5] This is a view of the adsorption device from the bottom. [Figure 6] This is a cross-section along lines AA, BB, and CC. [Figure 7] This is a perspective view of electronic equipment. [Figure 8] This is a cross-sectional view of an electronic device case along the DD line. [Figure 9] This is a rear view of an electronic device case. [Modes for carrying out the invention]

[0012] Embodiments of the present invention will be described below with reference to the drawings.

[0013] (First Embodiment) Figures 1(a) to 1(c) are external views of an electronic device to which a suction device according to the first embodiment of the present invention is applied. This electronic device is configured as an imaging device 100, as an example. The imaging device 100, as an imaging means, is an automatic camera that automatically recognizes a person and automatically takes a picture with an appropriate composition, and the lens unit is held so as to be able to tilt and pan. A suction device 200 is provided on the bottom surface of the imaging device 100.

[0014] Although the suction device 200 is integrated into the imaging device body, the two may be separate. For example, the suction device 200 may be configured as a detachable attachment to the imaging device body, so that the imaging device 100 is formed when the suction device 200 is attached. Therefore, the imaging device body may also be referred to as the imaging device.

[0015] Fig. 1(a) is a perspective view of the upper surface side of the imaging apparatus 100. Fig. 1(b) is a perspective view of the bottom surface side of the imaging apparatus 100. Fig. 1(c) is a side view of the imaging apparatus 100. Fig. 1(c) shows a state where the imaging apparatus 100 is horizontally fixed to a wall X, which is a magnetic body, by the magnetic force generated by the suction device 200.

[0016] The main body of the imaging apparatus 100 is mainly composed of a first housing 1 and a second housing 2. The first housing 1 is disposed on an upper portion of the second housing 2, and the first housing 1 is held with respect to the second housing 2 so as to be capable of horizontal rotation (rotation in the direction of the solid-line arrow 12), that is, panning operation, around the rotation axis P serving as the center of rotation. The top cover 10 is an exterior component of the imaging apparatus 100. The top cover 10 has a dome member 11 that covers the front portion and the upper portion. The dome member 11 is molded from a transparent resin material such as polycarbonate resin or acrylic resin, and an acrylic resin with high light transmittance is used in the present embodiment. Inside the dome member 11, the lens unit 3 is held so as to be capable of vertical rotation (rotation in the direction of the broken-line arrow 13), that is, tilting operation, around the rotation axis T serving as the center of rotation. Further, a control board, a driving battery and the like are built in the second housing 2 (none of which are shown).

[0017] With the configuration described above, the imaging apparatus 100 can move the lens unit 3 relative to the second housing 2 by appropriately combining panning rotation and tilting rotation, so that photographing in various directions is possible even when the imaging apparatus 100 is arranged at a fixed point.

[0018] Figs. 2(a) and 2(b) are perspective views of the suction device 200 as seen from the upper surface side and the bottom surface side, respectively. A rubber sheet 25 is provided on the bottom surface of the suction device 200. The bottom surface of the suction device 200, that is, the surface of the rubber sheet 25, serves as a suction surface Y that sucks a magnetic body by magnetic force. The suction device 200 has permanent magnets 32 (32a to 32d) (see Fig. 3) inside, and exhibits suction force by the magnetic force of these permanent magnets 32a to 32d.

[0019] The adsorption device 200 has a rotatable operating part 22a on its outer circumference. When the user rotates the operating part 22a in the direction of arrow 50a (Figure 1(b)), the adsorption device 200 enters a state where it can adsorb magnetic materials (hereinafter referred to as the first state). When the user rotates the operating part 22a in the direction of arrow 50b, the adsorption device 200 enters a state where it does not adsorb magnetic materials or the adsorption force is very weak (hereinafter referred to as the second state). In this embodiment, the rotation direction of arrow 50a is the operating direction to the first state, and the rotation direction of arrow 50b is the operating direction to the second state, but the correspondence between the operating direction and the first and second states may be reversed.

[0020] As shown in Figure 1(c), by using the suction device 200, it becomes possible to take images with the imaging device 100, to which the suction device 200 is attached, fixed to a magnetic wall X. In Figure 1(c), an example is shown in which the imaging device 100 with the suction device 200 attached is fixed horizontally, but the suction surface Y may be, for example, a ceiling surface or a floor surface, and the orientation and posture of the imaging device 100 when fixed are not specified. Note that the magnetic material to which the suction device 200 is attached and fixed is not limited to a wall X.

[0021] Using Figure 1(c), the desirable placement of the suction device 200 on the main body of the imaging device 100 will be explained. When the imaging device 100 is used to take images by combining panning and tilting, the area indicated by the shaded area in Figure 1(c) is the imaging range Z. Therefore, it is desirable that the suction device 200 be placed in a position that does not belong to the imaging range Z (a position that does not interfere with the imaging range Z), for example, on the bottom side of the imaging device 100. By placing it in this position, the suction device 200 will not be in the field of view of the imaging device 100, thus reducing the possibility of the field of view narrowing. Consequently, it becomes possible to make the most of the imaging range Z of the imaging device 100.

[0022] Furthermore, the suction device 200 may be applied to an imaging device with a relatively wide field of view, where the imaging range Z extends in all directions with the imaging device 100 as the center (for example, a 360-degree camera).

[0023] Figure 3 is an exploded perspective view of the suction device 200. The rotation center of the suction device 200 is defined as the rotation axis Q. Hereafter, regarding the direction of the imaging device 100 including the suction device 200, the direction perpendicular to the suction surface Y (the axial direction of the rotation axis Q) will be defined as the V direction, the side with the suction surface Y will be the +V side, and the side with the main body of the imaging device 100 will be the -V side.

[0024] The suction device 200 mainly comprises a guide member 20 (fixing member), a moving unit 21, an operating member 22, a cover member 23, a first magnetic member 24, and a rubber sheet 25.

[0025] The guide member 20 is made of a non-magnetic material such as polycarbonate resin and has a cylindrical shape centered on the rotation axis Q. A guide groove 20a is formed in the cylindrical portion 20f of the guide member 20. The guide pin 30b (engaging portion) of the retaining member 30, which will be described later, engages with this guide groove 20a. Three identical guide grooves 20a are formed in accordance with the arrangement of the guide pins 30b.

[0026] The mobile unit 21 includes a holding member 30, a second magnetic member 31, and permanent magnets 32 (32a to 32d). The holding member 30 holds the second magnetic member 31 and the permanent magnets 32.

[0027] The retaining member 30 has a sliding surface 30a and cylindrical guide pins 30b. The sliding surface 30a is slidably fitted into the cylindrical portion 20f of the guide member 20. The guide pins 30b are provided at three equally spaced locations around the rotation axis Q and extend radially. The guide pins 30b engage with the guide grooves 20a of the guide member 20, and the tips of the guide pins 30b engage with the operating grooves 22b of the operating member 22, which will be described later. As a result, the retaining member 30 is held so as to rotate the operating member 22, and is movable along the guide grooves 20a of the guide member 20. The retaining member 30 has four openings 30c formed therein, corresponding to the permanent magnets 32a to 32d. The openings 30c penetrate in the V direction.

[0028] The second magnetic member 31 is made of a soft magnetic material such as iron or silicon steel. The second magnetic member 31 is fixed to the holding member 30 with screws (not shown). A permanent magnet 32 ​​is also attached to the second magnetic member 31. This amplifies the magnetic force of the permanent magnet 32 ​​toward the Y side (+V direction) of the attachment surface, thereby strengthening the attractive force to the magnetic material. On the other hand, the magnetic force of the permanent magnet 32 ​​toward the main body side (-V direction) of the imaging device 100 is reduced, thereby reducing the influence of the magnetic field on the inside of the imaging device 100.

[0029] The permanent magnet 32 ​​is a magnetic force generating member composed of neodymium magnets, ferrite magnets, etc., and possesses the magnetic force necessary to attract the imaging device 100, which is equipped with the adsorption device 200, to the magnetic material. The permanent magnet 32 ​​is attracted to the second magnetic member 31 through the corresponding opening 30c of the holding member 30. The permanent magnets 32a to 32d are all the same cylindrical shape and are arranged in a group of four (permanent magnets 32a, 32b, 32c, 32d) at approximately equal intervals in the circumferential direction around the rotation axis Q.

[0030] The permanent magnets 32 are polarized in the V direction. Two permanent magnets 32a and 32c are polarized so that their north poles are positioned on the +V side, while two permanent magnets 32b and 32d are polarized so that their south poles are positioned on the +V side. In other words, the polarity of the adsorption surface side (+V side) of adjacent permanent magnets 32 in the circumferential direction (for example, permanent magnets 32a and 32b, or permanent magnets 32c and 32d) is different from that of adjacent permanent magnets 32. To put it another way, each permanent magnet is positioned so that the polarity on the +V side alternates between north and south poles in the circumferential direction. Therefore, it has the characteristics of a quadrupole, and magnetic field lines are generated along the path shown by arrow 51 (a path that goes from the north pole to the south pole). Due to the interaction, it is possible to strengthen the magnetic force toward the adsorption surface Y side compared to the case where the same poles of all permanent magnets 32 are positioned on the adsorption surface Y side.

[0031] Furthermore, the shape of the permanent magnet 32 ​​may be a prism or other shape, and the number of permanent magnets is not limited to four; it can be one or more. Also, it is not essential to use permanent magnets as magnetic force generating members; as long as sufficient magnetic force can be secured to fix the imaging device 100, for example, plastic magnets, electromagnets or EPMs (Electropermanent magnets) may be used.

[0032] The operating member 22 is made of a non-magnetic material such as polycarbonate resin and has a cylindrical shape centered on the rotation axis Q. An operating groove 22b is formed on the inner circumferential surface 22f of the operating member 22, which engages with the guide pin 30b of the holding member 30.

[0033] As explained in Figure 4, when the operating part 22a is rotated around the rotation axis Q, the operating groove 22b drives the guide pin 30b, causing the guide pin 30b to move along the guide groove 20a. The rotational movement of the holding member 30 having the guide pin 30b allows the permanent magnet 32 ​​to be rotated around the rotation axis Q. In addition, the guide pin 30b moves in the V direction along the guide groove 20a for part of the movement process.

[0034] Since the operating member 22 is part of the external appearance of the suction device 200, as described above, it is designed to fit on the bottom surface of the imaging device 100 so that it does not enter the imaging range Z of the imaging device 100.

[0035] The cover member 23 is made of, for example, polycarbonate resin and has an annular shape. The cover member 23, together with the first magnetic member 24, is fixed to the guide member 20 with screws (not shown), thereby clamping the operating member 22.

[0036] The first magnetic member 24 is made of a soft magnetic material such as iron or silicon steel. The first magnetic member 24 has four openings 24a. The diameter of the openings 24a is set to be larger than the diameter of one permanent magnet 32 ​​so that a permanent magnet 32 ​​can be inserted into the corresponding opening 24a. As the moving unit 21 moves in the V direction, the permanent magnets 32 move in and out of the corresponding openings 24a.

[0037] The rubber sheet 25 is made of a rubber with a high coefficient of friction, such as silicone rubber, and is adhered to the first magnetic member 24 with double-sided tape (not shown). By placing the rubber sheet 25 on the bottom surface of the adsorption device 200, the opening 24a of the first magnetic member 24 is covered, improving the appearance quality and also serving to suppress slippage when adsorbed to a magnetic material.

[0038] By moving the movable unit 21, the relative position between the permanent magnet 32 ​​and the first magnetic member 24 can be changed, and the adsorption device 200 can be switched between the first state and the second state.

[0039] Next, we will explain the switching between the first and second states of the adsorption device 200 using Figures 4 to 6.

[0040] Figure 4(a) is an unfolded view of the inner circumferential surface 22f of the operating member 22. Figure 4(b) is an unfolded view of the cylindrical portion 20f of the guide member 20. Figure 4(c) is a superimposed view of the inner circumferential surface 22f of the operating member 22, the cylindrical portion 20f of the guide member 20, and the guide pin 30b of the holding member 30. All are viewed from the radially inward direction. Figure 4(d) will be described later as a modified example.

[0041] Figures 5(a) to 5(c) show the suction device 200 as viewed from the bottom side (+V side). In particular, Figure 5(a) shows the first state, Figure 5(b) shows an intermediate state between the first and second states, and Figure 5(c) shows the second state. Figures 5(a), (b), and (c) correspond to positions i, ii, and iii of the guide pin 30b in the guide groove 20a shown in Figure 4(c), respectively.

[0042] Figures 6(a) to 6(c) are cross-sectional views along lines AA, BB, and CC in Figures 5(a) to 5(c), respectively. Lines AA, BB, and CC are all cutting lines that pass through the center of permanent magnet 32a and the center of permanent magnet 32c.

[0043] As shown in Figure 4(a), the tip of the guide pin 30b formed on the holding member 30 engages with the operating groove 22b formed on the inner circumferential surface 22f of the operating member 22. As shown in Figure 4(b), the guide pin 30b of the holding member 30 penetrates and engages with the guide groove 20a formed on the cylindrical portion 20f of the guide member 20. The operation of the guide pin 30b through the cooperation of the operating groove 22b and the guide groove 20a will be explained using Figure 4(c).

[0044] When the guide pin 30b is in positions i, ii, and iii, the suction device 200 is in the first state, an intermediate state, and a second state, respectively. The guide groove 20a of the guide member 20 has a first region 70, a second region 71, and an intermediate region 73 between the first region 70 and the second region 71, as shown in Figure 4(b). The first region 70 and the second region 71 correspond to the first state and the second state, respectively. That is, the first region 70 is the region (section) for moving the guide pin 30b between positions i and ii. The intermediate region 73 is the region (section) for moving the guide pin 30b between positions ii and iii. The second region 71 is the region (section) for positioning the guide pin 30b at position iii.

[0045] With the guide pin 30b in position i, when the operating part 22a is rotated relative to the guide member 20 in the direction of arrow 50b, the inner circumferential surface 22f of the operating member 22 rotates in the direction of arrow 52 (Figure 4(c)).

[0046] For convenience, assuming that the main body of the imaging device 100 is stationary and the operating member 22 is rotating, the cylindrical portion 20f of the guide member 20 is stationary. When the operating member 22 rotates in the direction of arrow 52, ​​the guide pin 30b is driven by the operating groove 22b. Since the direction of movement from position i is restricted in the -V direction by the first region 70 of the guide groove 20a, the guide pin 30b moves from position i in the direction of arrow 53 (-V direction) through the cooperation of the operating groove 22b and the first region 70, and eventually reaches position ii.

[0047] From this point, as the inner circumferential surface 22f of the operating member 22 rotates in the direction of arrow 52, ​​the guide pin 30b moves along the intermediate region 73 of the guide groove 20a in the direction of arrow 54, reaching position iii.

[0048] On the other hand, when the guide pin 30b is in position iii, if the operating part 22a is rotated relative to the guide member 20 in the direction of arrow 50a, which is opposite to arrow 50b, the inner circumferential surface 22f of the operating member 22 rotates in the opposite direction to arrow 52. The guide pin 30b moves along the intermediate region 73 to reach position ii, and then moves along the first region 70 to reach position i.

[0049] In this way, when the operating member 22 is rotated, the guide pin 30b moves along the guide groove 20a of the guide member 20, and the relative position of the permanent magnet 32 ​​with respect to the first magnetic member 24 in the rotational direction and the V direction can be changed.

[0050] When the guide pin 30b is in position i, the permanent magnet 32 ​​is located inside the opening 24a of the first magnetic member 24 (inside the opening), as shown in Figures 5(a) and 6(a). The permanent magnet 32 ​​is located inside the corresponding opening 24a, and there is no overlapping region between the permanent magnet 32 ​​and the portion of the first magnetic member 24 that is not the opening 24a (Figure 5(a)). Also, the permanent magnet 32 ​​is closest to the adsorption surface Y in the V direction (Figure 6(a)). Therefore, when the guide pin 30b is in position i, the magnetic field lines emanating from the north poles of the permanent magnets 32a and 32c pass through the magnetic material 300 such as the wall X and form a path (indicated by arrow 57) that returns to the south poles of the permanent magnets 32b and 32d (Figure 6(a)). Since most of the magnetic field lines emanating from the permanent magnets 32a and 32c pass through the magnetic material 300 rather than the first magnetic member 24, the adsorption device 200 can exert sufficient magnetic force to fix the imaging device 100 to the magnetic material 300.

[0051] As the guide pin 30b moves from position i to position ii, the distance of the permanent magnet 32 ​​from the adsorption surface Y in the V direction increases, but the relative relationship between the permanent magnet 32 ​​and the first magnetic member 24 in the projection viewed from the V direction does not change (Figure 5(b)).

[0052] The intermediate region 73 is formed parallel to the circumferential direction around the rotation axis Q. Therefore, during the process in which the guide pin 30b moves from position ii to position iii, the distance of the permanent magnet 32 ​​from the adsorption surface Y in the V direction does not change, and the relative relationship between the permanent magnet 32 ​​and the first magnetic member 24 in the projection viewed from the V direction changes.

[0053] Furthermore, as shown in Figures 5(c) and 6(c), when the guide pin 30b is in position iii, the distance of the permanent magnet 32 ​​from the adsorption surface Y in the V direction is longer compared to when it is in position i. Moreover, in the projection viewed from the V direction, the first magnetic member 24 (the portion other than the opening 24a) and the permanent magnet 32 ​​have an overlapping region. At this time, the force that attracts the permanent magnet 32 ​​to the first magnetic member 24 also pulls the holding member 30 that holds the permanent magnet 32 ​​toward the adsorption surface Y, so that the state in which the guide pin 30b is in position iii is stably maintained.

[0054] Therefore, in the second state shown in Figure 6(c), the magnetic field lines emanating from the north poles of the permanent magnets 32a and 32c form a path (indicated by arrow 58) that passes through the first magnetic member 24 and returns to the south poles of the permanent magnets 32b and 32d, in addition to the path that passes through the magnetic material 300 (indicated by arrow 57).

[0055] As shown in Figure 5(c), the permanent magnet 32 ​​and the first magnetic member 24 have a region W that overlaps projectively, resulting in a greater amount of magnetic flux passing through the path indicated by arrow 58 compared to the path indicated by arrow 57. With this configuration, the attractive force on the magnetic material 300 is reduced compared to the first state, and the external leakage magnetic field of the adsorption device 200 is also reduced.

[0056] Furthermore, as shown in Figure 5(c), in the second state, the magnetic field lines emanating from the north pole of the permanent magnet 32a form a path through the first magnetic member 24, passing through arrows 58a and 58b, and returning to the south poles of the permanent magnets 32b and 32d. The same applies to the magnetic field lines emanating from the north pole of the permanent magnet 32c. The formation of the magnetic field line paths indicated by arrows 58a and 58b disperses the distribution of magnetic flux density within the first magnetic member 24, making it possible to reduce the magnetic force generated outside the adsorption device 200.

[0057] Here, a preferred design for the first region 70 and the opening 24a is described. As shown in Figure 4(c), the first region 70 has a separation distance d1, which is the length required to separate the guide pin 30b from position i to position ii. The permanent magnet 32 ​​is separated from the adsorption surface Y in the -V direction. By allowing as many magnetic field lines generated from the permanent magnet 32 ​​as possible to pass through the first magnetic member 24, it is possible to reduce the adsorption force of the adsorption device 200 in the second state. In this respect, a larger overlap region between the permanent magnet 32 ​​and the first magnetic member 24 is advantageous in the second state. Therefore, it is desirable that the opening 24a of the first magnetic member 24 be opened in the V direction as the smallest possible hole through which the permanent magnet 32 ​​can be inserted.

[0058] Furthermore, the separation distance d1 is equal to the separation distance d2 of the permanent magnet 32 ​​(Figure 6(b)). Therefore, the separation distance d1 is at least the length necessary for the permanent magnet 32 ​​to escape the opening 24a of the first magnetic member 24, and is therefore longer than the thickness d24 of the first magnetic member 24.

[0059] According to this embodiment, the permanent magnet 32 ​​moves relative to the first magnetic member 24, thereby transitioning the adsorption device 200 between a first state and a second state. When viewed from a direction perpendicular to the adsorption surface Y, the second state has an overlapping region between the permanent magnet 32 ​​and the first magnetic member 24 (Figure 5(c)), while the first state does not overlap between the permanent magnet 32 ​​and the first magnetic member 24 (Figure 5(a)). In the first state, many of the magnetic field lines exit the adsorption surface Y and pass through the magnetic material 300, resulting in a large adsorption force. In the second state, due to the action of the first magnetic member 24, many of the magnetic field lines do not exit the adsorption surface Y and do not pass through the magnetic material 300 much, thus suppressing the influence of the external magnetic field. This makes it possible to switch between a state that exhibits sufficient adsorption force and a state that reduces the influence of the external magnetic field. Therefore, it is possible to achieve both sufficient adsorption force when fixed and sufficient suppression of the influence of the external magnetic field when not fixed.

[0060] Furthermore, in the direction perpendicular to the adsorption surface Y, the distance between the permanent magnet 32 ​​and the adsorption surface Y is shorter in the first state compared to the second state (Figure 5(a)). In the aforementioned Patent Document 1, the magnet moves due to the difference in adsorption force, so for example, if a magnetic object such as a keychain is brought close from the outside after the attachment has been removed from the camera, the magnetic object may be unexpectedly attracted to the attachment. In contrast, in this embodiment, the strength of the adsorption force can be clearly and stably switched, so there is less risk of a magnetic object being unexpectedly attracted.

[0061] Furthermore, in the first state, the permanent magnet 32 ​​is located within the opening 24a of the first magnetic member 24, and in the second state, when viewed from a direction perpendicular to the adsorption surface Y, a part of the permanent magnet 32 ​​does not overlap with the opening 24a. Also, the permanent magnet 32 ​​rotates relative to the first magnetic member 24 about the rotation axis Q. This makes it possible to switch between strong and weak adsorption forces with a compact configuration. For example, in Patent Document 2, it is necessary to move the magnetic cylinder up and down relative to the magnet to transition between a state where the magnet is located inside the magnetic cylinder and a state where it is not, which results in a large adsorption device. In contrast, this embodiment suppresses the increase in size.

[0062] Furthermore, the polarity of the Y-side (+V-side) magnetic attraction surface of adjacent permanent magnets 32 in the circumferential direction around the rotation axis Q is different from that of the other. This makes it possible to strengthen the magnetic force on the Y-side magnetic attraction surface.

[0063] Furthermore, since the suction device 200 is positioned so as not to interfere with the imaging range Z of the panning and tilting imaging device 100, it does not impose any constraints on the field of view of the imaging device 100.

[0064] Alternatively, a guide groove 20a as shown in Figure 4(d) may be used. Figure 4(d) is an unfolded view of the cylindrical portion 20f of the modified guide member 20. In this guide groove 20a, the intermediate region 73 between the first region 70 and the second region 71 includes an inclined region 72.

[0065] In the intermediate region 73, the section from an intermediate position on the way from position ii to position iii to position iii is the inclined region 72. The inclined region 72 is inclined such that it becomes closer to the +V direction as it approaches position iii. Therefore, as the guide pin 30b moves from position ii to position iii, the distance of the permanent magnet 32 ​​from the adsorption surface Y in the V direction becomes shorter from a certain point. For example, in the intermediate region 73, the distance between the first magnetic member 24 and the permanent magnet 32 ​​is shorter when the guide pin 30b is at the second position P2, which is closer to the second region 71 than the first position P1. Therefore, when the inclined region 72 is in the second state at position iii, the permanent magnet 32 ​​approaches the first magnetic member 24, and the force of attraction to the first magnetic member 24 increases. This prevents unintentional switching from the second state to the first state.

[0066] The region W (Figure 5(c)) is designed to be largest when the device is in the second state. The attraction force of the adsorption device 200 varies not only with the attraction force of the permanent magnet 32 ​​itself, but also with the distance between the adsorption surface Y and the permanent magnet 32, the size of the region W, and other factors. To minimize the attraction force as much as possible in the second state, it is desirable that the permanent magnet 32 ​​and the first magnetic member 24 completely overlap in projection. However, the area of ​​the region W can be flexibly set as appropriate, taking into account the target attraction force and the allowable size of the adsorption device 200.

[0067] Furthermore, the electronic device to which the present invention applies is not limited to the imaging device 100. The suction device and the electronic device may be integrated or separate. The integrated suction device and electronic device may be referred to as either an electronic device or an imaging device.

[0068] (Second Embodiment) Figures 7(a) and 7(b) are perspective views of an electronic device to which a suction device according to a second embodiment of the present invention is applied. This electronic device 400 is configured as a smartphone, for example. An electronic device case 600 is detachably attached to the electronic device 400. A suction device 500 is provided on the back side of the electronic device case 600.

[0069] Figure 7(a) is a rear perspective view of the electronic device 400 and the electronic device case 600 on which the suction device 500 is installed. Figure 7(b) is a front perspective view of the electronic device 400 and the electronic device case 600 on which the suction device 500 is installed.

[0070] Figure 8 is a cross-sectional view of the electronic device case 600 equipped with the suction device 500, along the DD line in Figure 7(a). Figure 8(a) shows the first state, and Figure 8(b) shows the second state. Figure 9 is a rear view of the electronic device case 600 equipped with the suction device 500. Figure 9(a) shows the first state, and Figure 9(b) shows the second state.

[0071] The electronic device 400 is equipped with a lens unit 403a on its back and a lens unit 403b and a display 405 on its front (Figures 7(a) and (b)). The electronic device 400 contains a control board (not shown) and a drive battery, among other things. The electronic device 400 also functions as an imaging device. By attaching the electronic device case 600, which is equipped with a suction device 500, to the electronic device 400, the electronic device 400 can be fixed to the magnetic material 300, and imaging can be performed with the lens unit 403b.

[0072] The suction device 500 has two permanent magnets 532 (532a, 532b) inside, and can be attracted to the magnetic material 300 using the magnetic force of the permanent magnets 532 with the surface of the rubber sheet 525 as the suction surface Y. When the user moves the operating part 522a of the operating member 522 (Figure 7(a)) in a straight line in the direction of arrow 550a, the suction device 500 enters the first state, and when the operating part 522a is moved in a straight line in the direction of arrow 550b, the suction device 500 enters the second state.

[0073] In this embodiment, the direction of arrow 550a is the direction of operation to the first state, and the direction of arrow 550b is the direction of operation to the second state. However, the correspondence between the direction of operation and the first and second states may be reversed.

[0074] Furthermore, the electronic device case 600 with the suction device 500 integrated into it may be referred to as the electronic device or suction device of the present invention. Also, it is not essential that the electronic device case 600 and the suction device 500 are integrated; the suction device 500 may be a detachable attachment type to the electronic device case 600. Alternatively, the electronic device 400 may also be integrally equipped with the suction device 500.

[0075] As shown in Figure 8(a), the adsorption device 500 mainly comprises a guide member 520, a holding member 530, a moving unit 521, an operating member 522 (Figure 7(a)), a magnetic member 524, and a rubber sheet 525. The permanent magnet 532 is prism-shaped, with the N pole of the permanent magnet 532a positioned on the Y side of the adsorption surface, and the S pole of the permanent magnet 532b positioned on the Y side of the adsorption surface.

[0076] In this embodiment, the suction state of the suction device 500 (first state, second state) is switched by moving the permanent magnet 532 and the magnetic member 524 relative to each other. In the first embodiment, the suction state of the suction device 200 was switched by rotating the operating unit 22a, but in this embodiment, the suction state of the suction device 500 is switched by moving the operating unit 522a in a straight line.

[0077] As shown in Figures 8(a) and (b), the retaining member 530 has a guide pin 530b and holds a permanent magnet 532. The operating member 522 has an operating groove 522b that engages with the guide pin 530b. The guide member 520 is fixed to the electronic device case 600. The guide member 520 has a guide groove 520a.

[0078] In this embodiment, the same interaction occurs between the guide pin 530b, the operating groove 522b, and the guide groove 520a as in the first embodiment. In the first state (Figures 8(a) and 9(a)), the guide pin 530b is at a position corresponding to position i, and in the second state (Figures 8(b) and 9(b)), the guide pin 530b is at a position corresponding to position iii.

[0079] In the first state, the permanent magnet 532 is closest to the adsorption surface Y in the front-to-back direction (Figure 8(a)). In a rear view, the permanent magnet 532 and the magnetic member 524 do not overlap projectively (Figure 9(a)). In the first state, the magnetic field lines emanating from the N pole of the permanent magnet 532a form a path that passes through the magnetic material 300 as shown by arrow 557 and returns to the S pole of the permanent magnet 532b. Therefore, similar to the first embodiment, since most of the magnetic field lines emanating from the permanent magnet 532a pass through the magnetic material 300 rather than the magnetic member 524, the adsorption device 500 can exert sufficient adsorption force to fix the electronic device 400 to the magnetic material 300.

[0080] From the state shown in Figure 8(a), when the user moves the operating unit 522a in a straight line in the direction of arrow 550b (Figure 7(a)), the guide pin 530b, which is engaged with the operating groove 522b, moves along the guide groove 520a to a position corresponding to position iii. By moving the holding member 530 having the guide pin 530b, the permanent magnet 532 can be moved to a desired position, and the relative position of the permanent magnet 532 with respect to the magnetic member 524 can be changed.

[0081] In the second state, the distance between the adsorption surface Y and the permanent magnet 532 in the front-to-back direction is increased compared to the first state (Figure 8(b)). In a rear view, the permanent magnet 532 and the magnetic member 524 overlap projectively (Figure 9(b)).

[0082] In the second state, most of the magnetic field lines emanating from the north pole of the permanent magnet 532a form a path indicated by arrow 558, which passes through the magnetic member 524 and returns to the south pole of the permanent magnet 532b, separate from the path indicated by arrow 557 which passes through the magnetic material 300. Because the permanent magnet 532 and the magnetic member 524 have a region W (Figure 9(b)) that overlaps projectively, the amount of magnetic flux passing through the path indicated by arrow 558 is greater than that passing through the path indicated by arrow 557. As a result, similar to the first embodiment, the attraction force of the adsorption device 500 to the magnetic material 300 is reduced, and the external leakage magnetic field of the adsorption device 500 is also reduced.

[0083] According to this embodiment, the same effects as in the first embodiment can be achieved in switching between a state in which sufficient adsorption force is exerted and a state in which the influence of the external magnetic field is reduced.

[0084] In this embodiment as well, similar to the first embodiment, the guide groove 520a may be provided with an inclined region similar to the inclined region 72 shown in Figure 4(d).

[0085] In each of the above embodiments, in the first state, the permanent magnets 32, 532 and the magnetic members 24, 524 do not overlap at all in projection, but they may partially overlap depending on the required attractive force. In other words, in the first state, compared to the second state, the area in which the magnetic members 24, 524 and the permanent magnets 32, 532 overlap should be smaller, or they should not overlap at all. Focusing only on the opening 24a in the first embodiment, in the second state, either a part of the permanent magnet 32 ​​overlaps with the opening 24a, or the permanent magnet 32 ​​does not overlap with the opening 24a.

[0086] In the above embodiments, the operating members 22 and 522 have groove shapes and the holding members 30 and 530 have guide pins, but the side with the groove shape and the side with the guide pins may be reversed.

[0087] In the above embodiments, the permanent magnets 32 and 532 are configured to move among the permanent magnets 32 and 532 and the magnetic members 24 and 524. However, the permanent magnets 32 and 532 and the magnetic members 24 and 524 only need to move relative to each other, and at least one of them may be configured to be movable. The relative movement in this case is not limited to rotational movement or linear movement.

[0088] Although the present invention has been described in detail above based on its preferred embodiments, the present invention is not limited to these specific embodiments, and various forms that do not depart from the spirit of the invention are also included in the present invention. Some of the above embodiments may be combined as appropriate.

[0089] This embodiment includes the following configuration. (Configuration 1) An adsorption device having an adsorption surface that is attracted to a magnetic material by magnetic force, Magnetic material and The magnetic force generating member moves relative to the magnetic member, thereby causing the adsorption device to transition between a first state and a second state. An adsorption device characterized in that, when viewed from a direction perpendicular to the adsorption surface, in the second state, there is a region in which the magnetic member and the magnetic force generating member overlap, and in the first state, compared to the second state, the region in which the magnetic member and the magnetic force generating member overlap is smaller or the magnetic member and the magnetic force generating member do not overlap. (Configuration 2) The adsorption device according to Configuration 1, characterized in that, in the direction perpendicular to the adsorption surface, the distance between the magnetic force generating member and the adsorption surface is shorter in the first state compared to the second state. (Configuration 3) A fixing member having a guide groove and to which the magnetic member is fixed, A holding member having an engaging portion that engages with the guide groove and holding the magnetic force generating member, It has an operating member that engages with the aforementioned engaging portion, The adsorption device according to configuration 1 or 2, characterized in that when the operating member is operated, the engaging portion moves along the guide groove, causing the magnetic force generating member to move relative to the magnetic member. (Configuration 4) In the direction perpendicular to the adsorption surface, the distance between the magnetic force generating member and the adsorption surface is shorter in the first state compared to the second state. The guide groove has a first region corresponding to the first state, a second region corresponding to the second state, and an intermediate region between the first region and the second region. The adsorption device according to configuration 3, characterized in that the distance between the magnetic force generating member and the adsorption surface is shorter when the engaging portion is located in a second position, which is closer to the second region than the first position, compared to when the engaging portion is located in a first position within the intermediate region. (Configuration 5) The magnetic member has an opening, In the first state described above, the magnetic force generating member is located within the opening of the magnetic member. The adsorption device according to any one of configurations 1 to 4, characterized in that, when viewed from a direction perpendicular to the adsorption surface, in the second state, a part of the magnetic force generating member overlaps with the opening or the magnetic force generating member does not overlap with the opening. (Configuration 6) The adsorption device according to any one of Configurations 1 to 5, characterized in that the magnetic force generating member rotates relative to the magnetic member with respect to the rotation center. (Configuration 7) A plurality of the magnetic force generating members, polarized in a direction perpendicular to the adsorption surface, are arranged in a circumferential direction with respect to the rotation center. The adsorption device according to configuration 6, characterized in that the polarities of the adsorption surface sides of adjacent magnetic force generating members in the circumferential direction are different from each other. (Configuration 8) The adsorption device according to any one of Configurations 1 to 4, characterized in that the magnetic force generating member moves linearly relative to the magnetic member. (Configuration 9) An electronic device characterized by comprising the adsorption device described in any one of Configurations 1 to 8. (Configuration 10) An adsorption device according to any one of Configurations 1 to 8, An electronic device having an imaging means, The electronic device is characterized in that the adsorption device is positioned in a location that does not interfere with the imaging range of the imaging means. [Explanation of Symbols]

[0090] 32,532 permanent magnets 24 First magnetic member 200, 500 adsorption device 300 Magnetic material 524 Magnetic material Y Adsorption surface

Claims

1. An adsorption device having an adsorption surface that is attracted to a magnetic material by magnetic force, Magnetic material and A magnetic force generating member that is movable relative to the magnetic member, A fixing member having a guide groove and fixing the magnetic member, A holding member having an engaging portion that engages with the guide groove and holding the magnetic force generating member, It has an operating member that engages with the aforementioned engaging portion, When the operating member is operated, the engaging portion moves along the guide groove, causing the magnetic force generating member to move relative to the magnetic member, and the adsorption device transitions between a first state and a second state. An adsorption device characterized in that, when viewed from a direction perpendicular to the adsorption surface, in the second state, there is a region in which the magnetic member and the magnetic force generating member overlap, and in the first state, compared to the second state, the region in which the magnetic member and the magnetic force generating member overlap is smaller or the magnetic member and the magnetic force generating member do not overlap.

2. The adsorption device according to claim 1, characterized in that, in a direction perpendicular to the adsorption surface, the distance between the magnetic force generating member and the adsorption surface is shorter in the first state compared to the second state.

3. In the direction perpendicular to the adsorption surface, the distance between the magnetic force generating member and the adsorption surface is shorter in the first state compared to the second state. The guide groove has a first region corresponding to the first state, a second region corresponding to the second state, and an intermediate region between the first region and the second region. The adsorption device according to claim 1, characterized in that the distance between the magnetic force generating member and the adsorption surface is shorter when the engaging portion is located in a second position, which is closer to the second region than the first position, compared to when the engaging portion is located in a first position within the intermediate region.

4. The magnetic member has an opening, In the first state described above, the magnetic force generating member is located within the opening of the magnetic member. The adsorption device according to claim 1, characterized in that, when viewed from a direction perpendicular to the adsorption surface, in the second state, a part of the magnetic force generating member overlaps with the opening or the magnetic force generating member does not overlap with the opening.

5. The adsorption device according to claim 1, characterized in that the magnetic force generating member rotates relative to the magnetic member with respect to the rotation center.

6. Multiple magnetic force generating members, polarized in a direction perpendicular to the adsorption surface, are arranged in a circumferential direction with respect to the rotation center. The adsorption device according to claim 5, characterized in that the polarities of the adsorption surface sides of adjacent magnetic force generating members in the circumferential direction are different from each other.

7. The adsorption device according to claim 1, characterized in that the magnetic force generating member moves linearly relative to the magnetic member as the engaging portion moves along the guide groove.

8. An electronic device comprising a suction device according to any one of claims 1 to 7.

9. The adsorption device according to any one of claims 1 to 7, An electronic device having an imaging means, The electronic device is characterized in that the adsorption device is positioned in a location that does not interfere with the imaging range of the imaging means.

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