TWI727561B - Switching magnetic reed detector - Google Patents

Abstract

A switchable magnetic reed detector includes a housing, a switch structure, a switch drive device, a driving magnet, and a double-pin magnetic reed tube. The switch structure is arranged in the housing and includes a relatively movable pivot module and a carrier board. The driving device is arranged in the housing for changing the relative position of the pivoting module and the carrier board, the driving magnet is pivoted on the pivoting module, the double-pin magnetic reed tube is arranged on the carrier board and has an effective sensing range; the double-pin The relative position between the magnetic reed tube and the driving magnet can be in the first relative position or the second relative position. The first relative position makes the driving magnet within the effective sensing range of the double-pin magnetic reed tube, and the second relative position makes The driving magnet is located outside the effective sensing range of the double-pin magnetic reed tube; through the operation of the switching structure, the double-pin magnetic reed tube can be switched in the normally open or normally closed state.

Description

Switching magnetic reed detector

The invention relates to a magnetic reed detector, in particular to a switchable magnetic reed detector that can switch between a normally open state and a normally closed state.

The magnetic reed detector is a detection device driven by a magnetic field. It is commonly used in anti-theft detection or motion detection. For example, with the use of a magnet, it can be used to detect whether doors, windows, and rolling doors are closed or opened.

There is a reed switch inside the magnetic reed detector. There are two-pin reed switches that are common on the market. The basic structure of the reed switch is that there are two reeds inside the glass tube, and the outside of the glass tube is equipped with separate electric The two pins of the two reeds are electrically connected, and the two pins can be electrically connected to the control circuit. Take the Normal Open (NO) reed switch as an example. In the initial state when there is no magnet close to the double-pin reed switch, the two reeds are separated from each other and are in an open state; when a magnet approaches, the two reeds are open. The reeds are magnetically attracted to each other under the influence of the magnetic field, and then contact and conduct.

Since the double-pin reed switch has only one state (normally open state or normally closed state), the application of its circuit is limited. For advanced applications, there are three-pin magnetic reed pipes with both Normal Open (NO) and Normal Closed (NC) types on the market. The basic structure of the reed tube is a reed inside the glass tube. , A first conductor and a second conductor, the outside of the glass tube is provided with a common terminal pin, a normally open terminal pin and a normally closed terminal pin, the common terminal pin is electrically connected to the reed, the normally open end The pin is electrically connected to the first conductor, and the normally closed terminal pin is electrically connected to the second conductor; in the initial state when there is no magnet close to the three-pin magnetic reed tube, the reed contacts the second conductor, causing the The common terminal pin and the normally open terminal pin are in an open state, and the common terminal pin and the normally closed terminal pin are in a conductive state; when a magnet approaches, the reed is affected by the magnetic field and is magnetically attracted to the first conductor , And then contact the first conductor to make the The common terminal pin and the normally open terminal pin are transformed into a conducting state, and the common terminal pin and the normally closed terminal pin are transformed into an open state.

Since the three-pin magnetic reed switch has both normally open and normally closed functions, its application is more versatile than that of the two-pin magnetic reed switch; unfortunately, compared with the two-pin magnetic reed switch, the three-pin magnetic The structure of the reed pipe is more complicated and the price is more expensive. Therefore, how to reduce product costs and achieve multiple functions with low-cost components is actually a major issue.

In view of this, the main purpose of the present invention is to provide a switchable reed detector, which can achieve the switching function of normally open and normally closed with a lower cost two-pin reed tube with a switching structure. The present invention does not use The expensive three-pin reed switch overcomes the problem of high cost.

The switching type magnetic reed detector of the present invention includes: a housing with an accommodating space inside; a switching structure, which is arranged in the accommodating space and includes a pivotal module and a carrier that can move relatively, wherein the The pivot module has a limiting part; a switching drive device that can drive the relative position of the pivot module and the carrier to change is set in the accommodating space; a driving magnet is pivoted on the pivot module And abuts against the limiting part; and a dual-pin magnetic reed tube, which is arranged on the carrier board and has an effective sensing range; the relative position between the dual-pin magnetic reed tube and the driving magnet is selectable In a first relative position and a second relative position, the first relative position is such that the driving magnet is positioned within the effective sensing range of the double-pin reed tube, and the second relative position is that the driving magnet is positioned in the The effective sensing range of the double-pin magnetic reed switch is outside.

Through the setting of the switching structure, the present invention can change the relative position of the driving magnet and the double-pin magnetic reed switch, achieving the function of switching the double-pin magnetic reed switch between the normally open state and the normally closed state. For example, if the two-pin magnetic reed tube is a normally open magnetic reed tube, the shape at the first relative position When there is no external magnet approaching, the driving magnet is within the effective sensing range of the double-pin reed switch, so the magnetic field of the drive magnet can affect the reeds in the double-pin reed switch to attract each other Contact, the two-pin magnetic reed switch is transformed into a conducting state; when the external magnet approaches and affects the rotation of the driving magnet, the magnetic field induced by the two-pin magnetic reed switch changes, so the two-pin magnetic reed switch changes from the conducting state to the open state . On the contrary, in the state of the second relative position and no external magnet approaches, the driving magnet is located outside the effective sensing range of the double-pin reed switch, so that the reed in the double-pin reed switch When the external magnet is close, the magnetic field of the external magnet can influence the reeds in the double-pin magnetic reed tube to magnetically contact each other, making it change from the open circuit state to the conducting state.

Therefore, through the switching operation of the switching structure of the present invention, the dual-pin reed switch can achieve the functions of normally open and normally closed, and further achieves multiple application modes. The present invention uses a low-cost dual-pin reed switch, thereby Overcome the high cost of the three-pin magnetic reed switch.

10: Shell

11: The first shell

12: The second shell

121: Pivot

13: Long opening

20: Switch structure

21: Pivot module

211: The first limit

212: The second limit part

22: carrier board

23: Assembly board

231: Straight guide groove

232: Slot

233: Cylinder

24: pivot seat

241: Socket

25: Holder

30: Switching the drive device

31: Switching the drive

32: Compression spring

33: Knob element

331: Hinge

332: disc

333: Push to block

334: Conflict

335: Abutment Surface

40: Double pin magnetic reed pipe

50: drive magnet

60: External magnet

70: Telescopic pole

80: fixed seat

Fig. 1: A schematic diagram of a three-dimensional appearance of an embodiment of a switchable magnetic reed detector of the present invention.

Figure 2: A three-dimensional exploded schematic diagram of an embodiment of the switching type magnetic reed detector of the present invention.

Figure 3: A schematic side plan view of an embodiment of the switchable magnetic reed detector of the present invention.

Fig. 4: In the switchable magnetic reed detector of the present invention, the double-pin magnetic reed tube and the driving magnet are in a first relative position.

Figure 5: Another schematic cross-sectional view of the switchable magnetic reed detector of the present invention, where the double-pin magnetic reed tube and the driving magnet are in the first relative position.

Fig. 6: In the switchable magnetic reed detector of the present invention, the two-pin magnetic reed tube and the driving magnet are in a first relative position, and they are cross-sectional schematic diagrams of being driven by an external magnet.

Fig. 7: In the switchable magnetic reed detector of the present invention, the two-pin magnetic reed tube and the driving magnet are cross-sectional schematic diagrams in the second relative position.

Fig. 8: Another schematic cross-sectional view of the switchable magnetic reed detector of the present invention in which the double-pin magnetic reed tube and the driving magnet are in the second relative position.

Fig. 9: In the switchable magnetic reed detector of the present invention, when the double-pin magnetic reed tube and the driving magnet are in the second relative position, it is a schematic cross-sectional view of being driven by an external magnet.

Fig. 10: A schematic diagram of the three-dimensional appearance of the embodiment of the switchable magnetic reed detector of the present invention combined with a telescopic rod and a fixed seat.

Fig. 11: A schematic side plan view of Fig. 10.

Please refer to FIGS. 1 and 2, the switchable reed detector of the present invention includes a housing 10, a switch structure 20, a switch drive device 30, a dual-pin reed tube 40 and a driving magnet 50.

The housing 10 has an accommodating space inside; in the embodiment of the present invention, the housing 10 may be a plastic housing, and the housing 10 may include a first housing 11 and a second housing 12 that are connected to each other.

The switching structure 20 is disposed in the accommodating space of the housing 10, the switching structure 20 can be fixed in the first housing 11, and the switching structure 20 includes a pivot module 21 and a carrier 22 that are relatively movable , The pivot module 21 has a limiting portion; in the embodiment of the present invention, the switching structure 20 can be a component made of plastic, the pivot module 21 is fixed in the housing 10, and the carrier 22 can be opposed to The pivot module 21 moves linearly. In other embodiments, the carrier board 22 may be fixed in the housing 10, and the pivot module 21 may move relative to the carrier board 22.

The switching drive device 30 can drive the pivotal module 21 and the carrier board 22 to change the relative position of the housing 10, the switching drive device 30 has a switching drive 31, the switching drive 31 can be operated by the user to change the relative position of the pivotal module 21 and the carrier board 22. The driving mode of the switching drive device 30 can be, for example, pushing, pulling or rotating; in the embodiment of the present invention, because the The pivot module 21 is fixed, so the switching drive device 30 can drive the carrier board 22 to move and position relative to the pivot module 21 according to a user's operation.

The dual-pin magnetic reed tube 40 is disposed on the surface of the carrier board 22 and has an effective sensing range. The driving magnet 50 is rotatably disposed on the pivot module 21 and abuts against the limiting portion. In the embodiment of the present invention, because the pivot module 21 is fixed, the driving magnet 50 is rotatable, and the carrier plate 22 is movable, as a whole, the double The pin magnetic reed tube 40 can move relative to the driving magnet 50, and the driving magnet 50 can rotate relative to the double pin magnetic reed tube 40. On the other hand, through the relatively movable pivot module 21 and the carrier board 22 of the switching structure 20, the relative position between the two-pin magnetic reed tube 40 and the driving magnet 50 can be selected to be in the first position. A relative position (as shown in Fig. 4) and a second relative position (as shown in Fig. 7), the first relative position is such that the driving magnet 50 is positioned within the effective sensing range of the double-pin reed switch 40 , The second relative position is such that the driving magnet 50 is positioned outside the effective sensing range of the double-pin magnetic reed tube 40. For example, when the driving magnet 50 is within the effective sensing range of the double-pin reed switch 40, the magnetic field of the drive magnet 50 can affect the reeds in the double-pin reed switch 40 to magnetically contact or separate from each other. .

Please refer to FIG. 2, in the embodiment of the present invention, the switching structure 20 may further include an assembly board 23. The surface of the assembly board 23 is formed with a straight groove 231, and the straight groove 231 extends to the edge of the assembly board 23. The carrier board 22 is movably disposed in the straight guide groove 231. The pivot module 21 can be combined with the assembly board 23. As shown in FIG. 2, the assembly board 23 forms a slot 232 on opposite sides of the straight guide groove 231, and the pivot module 21 includes two pivots. The two pivot seats 24 are fixed on the assembling board 23 and are respectively located on opposite sides of the straight guide groove 231, wherein the bottom of each pivot seat 24 forms an insert Each pivot seat 24 is assembled with its insertion portion 241 to each slot 232 of the assembling board 23, and each pivot seat 24 has a protruding surface on the side facing the other pivot seat 24 The limiting portion, the limiting portion includes a first limiting portion 211 and a second limiting portion 212, and there is a gap between the first limiting portion 211 and the second limiting portion 212; The accommodating member 25 is pivotally connected between the two pivotal seats 24, and a corner of the accommodating member 25 is located in the interval between the first limiting portion 211 and the second limiting portion 212, and can be abutted against One of the first limiting portion 211 and the second limiting portion 212; the driving magnet 50 is disposed in the receiving member 25.

For example, the surface of the carrier board 22 may be an XY plane, the straight groove 231 of the assembling board 23 extends along a first axis (for example, the Y axis), and the double-pin magnetic reed tube 40 may be A strip-shaped element parallel to the first axis, so the carrier 22 and the double-pin magnetic reed tube 40 can move linearly along the first axis, that is, the first relative position and the second relative position The position is that the position of the double-pin magnetic reed tube 40 and the driving magnet 50 in the first axial direction changes. The accommodating member 25 and the driving magnet 50 use a second axis (for example, the X axis) as the rotation axis, and the first axis is perpendicular to the second axis. The driving magnet 50 may be a cylinder, Its ends are respectively N pole and S level. The accommodating member 25 is oppositely arranged on the carrier board 22 along the Z-axis, so the driving magnet 50 is oppositely arranged on the double-pin reed switch 40 along the Z-axis. An elongated opening 13 is formed on the side of the housing 10, and the elongated opening 13 communicates with the accommodating space of the housing 10. The switching drive device 30 includes a compression spring 32 and a knob element 33. The compression spring 32 can be compressed and arranged between the end wall surface of the straight guide groove 231 of the assembly board 23 and the side surface of the carrier board 22. The knob The element 33 is pivoted on the assembling plate 23. The knob element 33 includes a rotating shaft 331, a disc 332 formed on the rotating shaft 331, and a pushing block 333. The rotating shaft 331 is along the Z-axis. 333 has an abutting surface 335 (as shown in FIG. 5) and an abutting surface 334 (as shown in FIG. 8) for contacting the side surface of the carrier board 22, and the abutting surface 334 is located at the end of the thrust block 333 The abutting surface 335 is a side surface of the pushing block 333, and the switching driving member 31 is a convex portion formed on the side surface of the disc 332, and the convex portion extends out of the elongated opening 13 of the housing 10 to For users to toggle and rotate. In the embodiment of the present invention, the bottom surface of the straight guide groove 231 of the assembling plate 23 protrudes from a column 233, the column 233 is located outside the carrier plate 22, the second housing 12 has a pivot hole 121, the pivot The position of the hole 121 is relative to the cylinder 233. One end of the rotating shaft 331 of the knob element 33 is inserted into the pivot hole 121 and the other end has a concave hole (not shown). The cylinder 233 is inserted into the concave hole, thereby , The knob element 33 is rotatably combined with the assembly plate 23 and the housing 10.

The structure of the present invention has been described above, and the mechanical action of the present invention will be described in conjunction with the drawings below. The two-pin magnetic reed switch 40 takes a Normal Open (NO) magnetic reed switch as an example, that is, the two-pin magnetic reed switch 40 is in an open state in an initial state that is not affected by a magnetic field.

3, 4 and 5, the abutment surface 335 of the push block 333 of the knob element 33 abuts against the end surface of the carrier board 22, at this time the double-pin magnetic reed tube 40 and the driving magnet 50 In the first relative position, without the influence of external magnets, the corners of the accommodating member 25 abut against the first limiting portion 211 of the pivot seat 24, and the double-pin magnetic reed tube 40 is The magnetic field of the driving magnet 50 causes the reeds in the double-pin magnetic reed tube 40 to magnetically contact each other and maintain the conduction state; please refer to FIG. 6, when the external magnet 60 is close to the driving magnet 50, the driving magnet The external magnet 60 rotates and abuts against the second limiting portion 212. At this time, the reed in the double-pin magnetic reed tube 40 changes from a conducting state to an open state under the influence of the change of the magnetic field.

Please refer to Figures 3, 7 and 8, when the user turns the knob element 33, the pushing block 333 turns, its pushing surface 334 abuts against the end surface of the carrier board 22, and makes the compression spring 32 In the compressed state, the two-pin magnetic reed tube 40 and the driving magnet 50 are in the second relative position at this time. Without the influence of an external magnet, comparing the state of FIG. 7 with that of FIG. 4, the relative position of the double-pin reed switch 40 and the driving magnet 50 changes, so that the double-pin reed switch 40 receives The magnetic field of the driving magnet 50 is relatively weak, causing the reeds in the double-pin reed tube 40 to be separated into an open state; please refer to FIG. 9, when the external magnet 60 is close to the driving magnet 50, the driving magnet 50 is affected The magnetic field of the external magnet 60 rotates and abuts against the second limiting portion 212. At this time, the two-pin reed switch 40 is affected by the magnetic field of the external magnet 60, so that the double-pin reed switch 40 is The reeds are in magnetic contact with each other and are kept in a conducting state.

The present invention can be applied to many occasions, such as anti-theft detection or motion detection. For example, with the use of an external magnet 60, it can be used to detect whether doors, windows, and rolling doors are closed or opened. Taking FIGS. 10 and 11 as an example, the first housing 11 of the housing 10 can be further pivotally connected to a telescopic rod 70, and the other end of the telescopic rod 70 is pivotally connected to a fixing seat 80 that can be installed on a wall ，The aforementioned external magnet 60 can For setting up a rolling door, the double-pin magnetic reed switch 40 is electrically connected to the control circuit through a wire. When the rolling door is lowered (door closed), the position of the external magnet 60 can correspond to the housing 10 as shown in Figure 6 or Figure 9. When the rolling door is retracted (door opened), the external magnet 60 is far away from the housing 10, making the double connection The circuit state of the foot reed switch 40 is changed, thereby detecting that the rolling door has been opened.

In summary, the present invention uses the switching structure 20 to change the relative position of the double-pin reed switch 40 and the driving magnet 50, so that the double-pin reed switch 40 can switch between normally open and normally closed. To allow the double-pin magnetic reed switch 40 to play a normally open or normally closed role in the control loop, the user can toggle the position of the switch driver 31 as shown in FIG. 5 or FIG. 8 to achieve the desired circuit action. Different from the traditional three-pin magnetic reed switch, the double-pin magnetic reed switch 40 used in the present invention has a lower cost, and in conjunction with the switching structure 20, it can achieve the switching function of normally open and normally closed at low cost. Products are more competitive.

10: Shell

11: The first shell

12: The second shell

121: Pivot

13: Long opening

20: Switch structure

21: Pivot module

211: The first limit

212: The second limit part

22: carrier board

23: Assembly board

231: Straight guide groove

232: Slot

233: Cylinder

24: pivot seat

241: Socket

25: Holder

30: Switching the drive device

31: Switching the drive

32: Compression spring

33: Knob element

331: Hinge

332: disc

333: Push to block

40: Double pin magnetic reed pipe

50: drive magnet

Claims (10)

A switchable magnetic reed detector, comprising: a housing with an accommodating space inside; a switching structure, arranged in the accommodating space and including a relatively movable pivot module and a carrier plate, wherein the The pivot module has a limit part; a switching drive device that can drive the relative position of the pivot module and the carrier board to change is arranged in the accommodating space; a driving magnet is pivoted on the pivot module And abut against the limiting part; and a dual-pin magnetic reed tube, which is arranged on the carrier board and has an effective sensing range; the relative position between the dual-pin magnetic reed tube and the driving magnet is selectable In a first relative position and a second relative position, the first relative position is such that the driving magnet is positioned within the effective sensing range of the double-pin reed tube, and the second relative position is that the driving magnet is positioned in the The effective sensing range of the double-pin magnetic reed switch is outside. The switchable magnetic reed detector according to claim 1, the switch structure includes an assembly plate, the surface of the assembly plate forms a straight groove, the straight groove extends to the edge of the assembly plate; the carrier plate is movable The setting is in the straight guide groove. According to the switchable magnetic spring detector of claim 2, the pivot module includes two pivot seats and a accommodating member, the two pivot seats are arranged on the assembly plate and are respectively located in the straight groove On opposite sides, each of the pivotal seats has a protruding stopper on the side facing the other pivotal seat; the accommodating member is pivotally connected between the two pivotal seats and abuts against the stopper部; The drive magnet is provided in the accommodating piece. For the switchable magnetic reed detector described in claim 3, the limiting portion of each pivot seat includes a first limiting portion and a second limiting portion, the first limiting portion and the second limiting portion There is a gap between the two limit parts; A corner of the accommodating member is located in the interval between the first limiting portion and the second limiting portion, and abuts against one of the first limiting portion and the second limiting portion. According to the switchable magnetic reed detector described in claim 4, the assembling plate is formed with a slot on opposite sides of the straight guide groove, and the bottom of each pivot seat forms an insertion part, and each pivot The socket is combined with the slot of the assembling board with its plug-in part. According to the switchable magnetic reed detector according to any one of claims 2 to 5, an elongated opening is formed on the side of the housing, and the elongated opening communicates with the accommodating space; the switching driving device includes: a compression spring , Set between the side surface of the carrier board and the end wall surface of the straight guide groove of the assembling plate; a knob element is pivoted on the assembling plate, the knob element includes a rotating shaft, a disc formed on the rotating shaft and a A push block, the push block has a push surface and an abutment surface for contacting the side surface of the carrier board, the push surface is located at the end of the push block; the switching drive is formed on the disc A convex part on the side surface of the housing, the convex part protrudes from the elongated opening of the housing. According to the switching type magnetic reed detector of claim 6, the housing includes a first housing and a second housing that are connected to each other, the switching structure is disposed in the first housing, and the second housing is provided with a Pivot hole; the bottom surface of the straight guide groove of the assembly plate protrudes a cylinder, the cylinder is located on the outside of the carrier plate; one end of the rotary shaft of the knob element is inserted into the pivot hole and the other end has a concave hole, the cylinder is inserted The recessed hole. According to the switchable magnetic reed detector according to any one of claims 1 to 5, the first relative position and the second relative position are that the two-pin magnetic reed tube and the driving magnet are in a first axial direction Change of position; The rotation axis of the driving magnet is a second axis, and the second axis is perpendicular to the first axis. According to the switchable magnetic reed detector described in claim 6, the first relative position and the second relative position are changes in the positions of the double-pin magnetic reed tube and the driving magnet in a first axial direction; the driving The rotation axis of the magnet is a second axis, and the second axis is perpendicular to the first axis. For the switchable magnetic reed detector described in claim 7, the first relative position and the second relative position are changes in the positions of the double-pin magnetic reed tube and the driving magnet in a first axial direction; the driving The rotation axis of the magnet is a second axis, and the second axis is perpendicular to the first axis.

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