TWI253661B - Point-push spring, sheet with point-push spring and switch device - Google Patents

Abstract

To provide a click spring and a sheet having the click spring that can be assembled easily and have high contact reliability, and also to provide a switch device that does not adversely and magnetically affect an earth magnetic sensor incorporated in electronic equipment. In the switch device for performing the switching operation of a contact, a dome-like movable contact 3 contacts and separates from a center-fixed contact 1b provided on a circuit board 2, the movable contact 3 is formed by a nonmagnetic stainless steel material with SUS 305 as a raw material, thus setting the relative permeability to 1.01 or smaller, preventing the movable contact 3 from magnetically and poorly affecting the earth magnetic sensor 7 mounted nearby, and preventing metal powder from being attracted by the movable contact 3 before assembling into the switch device, and hence preventing the decrease of contact reliability by the attraction of the metal powder.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switch device suitable for use in an electronic device such as a mobile phone, a click spring as a movable contact of the switch device, and a hook spring. Sheet. [Prior Art] A plurality of dial keys, function keys, and the like are disposed on the operation panel of the mobile phone, and the internal opening device is turned on by the user selectively pressing and operating the keys. The switch device has a fixed contact provided on an insulating substrate and a dome-shaped movable contact called a click spring, and the movable contact is provided on the insulating substrate and opposed to the fixed contact. Further, when the pressing force is not applied from the key to the movable contact, the movable contact is maintained away from the fixed contact due to the self-restoring force, and the pressing force is applied to the movable contact from the key pair, because the pressing The pressure causes the movable contact to buck, flip and be accompanied by a click feeling, and the movable contact is in contact with the fixed contact to form an on state. As described above, in such a switching device, the movable contact is repeatedly brought into contact with the fixed contact by the pressing force of the externally applied pressing force and the self-recovering action by the pressing force removal. In the prior art, a metal sheet having excellent spring characteristics such as stainless steel or phosphor bronze is used as a material for the movable contact (see, for example, Patent Document 1). Here, since phosphor bronze is comparable in mechanical strength to stainless steel, stainless steel is generally used as a material of a movable contact in the case of an electronic device that requires many times of keystroke life as a mobile phone. 99123.doc I25366l Special Act No. MW334 (Page 3.4, Figure 3) Non-recorded steel classified as ferritic system, according to its composition of main steel, 苴中作: Martensitic stainless steel and The austenitic system is also stainless: the second is a non-magnetic non-scale steel. It is known that there is no austenitic steel. "The use of open austenitic stainless steel A in the mobile phone of the captain, etc. After the inventor (4) is formed into a dome shape to form a movable contact, the relative magnetic permeability (μ) of the movable contact of the movable contact 1 & 4 results, and the relative magnetic permeability of the movable contact is found to be The magnetic property is changed to a horse: a bulk material by a 丨卞^^ mouth and a part or almost all of the austenite phase because the movable joint formed by the existing non-constant steel is a magnetic body: 'When storing or transporting before the group switch device, it is easy to be magnetically 'for example', it will hinder the vacuum adsorption at the time of grouping, or the metal powder will be damaged after the assembly, and the contact reliability will be damaged. a mobile phone with an electronic compass built with a geomagnetic sensor, which is incorporated into the switch device However, the magnetic influence of the connection will cause the magnetic sensor to not correctly detect the surrounding magnetic yoke. In addition, it must be noted that such a problem is not limited to the switching device in which the dome-shaped pawl spring is used as the movable contact. In the same way, the switch device that uses the click spring as only a component that generates a click feeling, that is, a thin film switch formed by a movable contact and a fixed contact on a film that is separated by a diaphragm, And a switching device formed by providing a detent spring on the upper film of the membrane switch. SUMMARY OF THE INVENTION The present invention has been made in view of the status quo of the prior art, and the object thereof is provided in 99123.doc 1253661. The task is simple and the contact reliability is high. The pawl and the blade with the pawl spring are also provided. The other purpose is to provide a geomagnetic salty water meter that is not built into the electronic device. ▼ Switching device for adverse magnetic influence. In order to achieve the above object, the click spring of the present invention can be reversed with a pressing force from the outside, and can be removed along with the pressing force. In the original operation of the self-k, the detent spring is formed by forming a dome-shaped steel material, and the relative magnetic permeability is 1〇1 or less, especially the SUS305 stainless steel material of the ns specification. The pawl spring is configured such that the pawl spring is not magnetized when it is stored or transported before being incorporated into the switch device, and therefore, the assembly work is simple, and the metal is not attracted by the click spring after being incorporated into the switch device. Further, the blade with the detent spring of the present invention has a bonding sheet, a pawl spring, and a non-magnetic peeling sheet, and the bonding sheet has a non-magnetic film. The sheet portion and the adhesive provided on the lower surface of the sheet portion, the upper surface of the pawl spring is adhered to the adhesive, and the release sheet is adhered to the adhesive sheet. According to the sheet with the ratchet spring thus constituted, the entire sheet in which the adhesive sheet, the pawl file, and the release sheet are integrally formed is non-magnetic, so that it can be stored or transported. It is reliably prevented that the pawl spring is magnetized, and the adhesive sheet and the pawl spring can be simply assembled by removing the peeling sheet when incorporated in the switch device. In addition, the switch device of the present invention includes an insulating substrate having a fixed contact, and a dome-shaped movable connection 99123.doc 1253661 which can be contact-separated for the above fixed contact, and has a relative magnetic permeability of 1〇1. contact. The following stainless steel steel forms the above

:=The switch device is constructed. Since the non-magnetic steel is not formed, the movable contact will not cause adverse magnetic influence on the equipment that is assembled. 'The metal powder will not be adsorbed on the movable contact. It can prevent the problem of damage to the reliability of the joint. In the above configuration, preferably, the movable contact is formed by a claw-sized SUS 305, in particular, a geomagnetic sensor having detectable geomagnetism, and the geomagnetic sensor is disposed on or near the insulating substrate. It is preferable that the lower side of the insulating substrate is a mobile phone with an electronic compass that prevents the geomagnetic sensor from malfunctioning due to the magnetic influence of the movable contact. Further, it is preferable that the movable contact is disposed on the insulating substrate, and the movable contact is covered by an upper sheet formed of an insulating film. Advantageous Effects of Invention The detent spring of the present invention is formed by forming a dome shape without a steel material and having a relative magnetic permeability (10). Therefore, it can be stored or transported in a group switch device. It is not easy to be magnetized, and the assembly work is simple. After being incorporated into the switch device, the reliability of the contact is not impaired by the ratchet spring adsorbing the metal powder. Further, the sheet of the pawl spring of the present invention has a bonding sheet, a detent spring, and a non-magnetic peeling sheet, and the bonding sheet has a sheet portion composed of a non-magnetic film and is disposed under the sheet portion. Adhesive agent 'The top of the detent spring is adhered to the adhesive. The release sheet is adhered to the adhesive sheet. Before being assembled into the switch device, the adhesive sheet, the detent spring and the peeling

99123..IOC 1253661 The sheet formed integrally with the cymbal sheet is non-magnetic as a whole, so that the pawl spring can be reliably prevented from being magnetized during maintenance, transportation, etc., and is removed by being removed when incorporated into the switch device. The sheet can be simply incorporated into the adhesive sheet and the pawl. Further, the switch device of the present invention comprises the above-described insulating substrate having a fixed contact and a dome-shaped movable contact which can be contacted and separated with respect to a fixed contact, and is formed of a stainless steel material having a relative magnetic permeability of 101 or less. Since the movable contact does not cause adverse magnetic influence on the equipment to be assembled, it can prevent damage to the contact due to the adsorption of metal powder on the movable contact. [Embodiment] Hereinafter, embodiments of the present invention will be described with reference to the drawings. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 2 is an exploded perspective view of a switch device according to a first embodiment of the present invention, FIG. 2 is a cross-sectional view of a main portion of the switch device, and FIG. 3 is a view showing a manufacturing process of a sheet attached to a movable contact of the switch device. FIG. 4 is a plan view of the sheet with the movable contact. As shown in FIG. 1 , the switch device of the present embodiment includes: a circuit board 2 having a plurality of fixed contacts 1 , a plurality of movable contacts 3 disposed on the circuit board 2 , and a bonding of the movable contacts 3 . The sheet 4 is composed of a laminated, social surface sheet 5 and a separator 6. Further, the switch is disposed in a casing (not shown) of a mobile phone to which two electronic compasses are attached, and a plurality of operation keys (not shown) corresponding to the respective movable contacts 3 are disposed on the operation panel of the casing. The circuit board 2 is composed of a non-magnetic 99123. "1253661 insulating substrate" such as epoxy resin or benzene (tetra) grease doped with glass, and a plurality of fixed contacts are formed on the circuit substrate 2 by a non-magnetic conductive material such as (4)! The wiring pattern shown in the figure. Each of the fixed contacts 1 is formed by a ring-shaped peripheral fixed fila and a central fixed connection (four) located at the center of the peripheral fixed contact. These peripheral fixed contacts la are fixed to the center, and the second is connected by the above wiring. The pattern is connected to a control circuit unit (not shown). 1. In addition, the circuit board 2 is mounted near the fixed contacts i, and the sensor 7' detects the surrounding magnetic field by the geomagnetic sensor. It can be recognized that “the direction of the electric side of the electric power is directed. It should be noted that in the present embodiment, the geomagnetic sensor 7 is mounted on the electric substrate 2 that is flush with the fixed contact points 但 'but' It is also possible to arrange the movable contact 3 on the lower surface of the circuit board 2 in a domed shape in a dome shape. As shown in FIG. 2, the peripheral portion of the contactable point 3 is always at the periphery of the (four) contact 1. ^Contact U is movable in the central part of the movable contact 3 It is fixed to the center at intervals (4). The movable contact 3 is made of cold-rolled with a claw specification (Japanese Industrial Standard) S305 (general composition: 18Cr_12Ni_G ic) as the raw material of the metal thin rate: After the relative magnetic permeability of the movable contact 3 = the electronic (Nan) Co., Ltd. (4), micrometer), it can be found that: contact 4 relative magnetic permeability WT (average measured value & pot is '(four) material敎, according to the relative magnetic permeability of the existing movable contact, the π Μ movable contact conditions are measured, and the five-conductivity is arranged in a cross shape in a plan view.” The father and the point are the central movable contact points. The opposite magnetic surface crotch sheet 5 is made of a non-magnetic insulating film such as a polyester resin, and the entire surface of the lower surface is coated with a binder. The spacer 6 is also composed of a non-magnetic insulating film such as a polyester resin, and the spacer 6 is separated by a spacer. The adhesive is laminated on the lower surface of the surface sheet 5. The through hole 6a is formed in the spacer 6, and the adhesive is adhered to the lower surface of the surface sheet 5 by the upper surface of the movable contact 3 disposed inside the through hole. On the agent, and each movable contact 3, surface sheet 5 and partition 6 were integrated. Further, by coating the adhesive in the entire lower spacer 6 while the bonding adhesive sheet 4 on the circuit board 2, and each of the movable contact 3 will be given with respect to the corresponding fixed contacts Shu

In addition, the movable contact 3 is covered by the surface sheet 5, so that foreign matter such as dust does not intrude into the contact portion. When manufacturing such an integral product of the movable contact 3 and the adhesive sheet 4, as shown in Figs. 3 and 4, first, the spacer 6 is adhered to the transport sheet 8 supplied by the endless belt (h〇〇p). Then, through holes 6a, 8a are respectively formed in the spacer 6 and the conveying sheet 8 by the punch. Next, after the surface sheet 5 is adhered to the spacer 6 to close the through hole 2, the movable contact 3 is inserted into the through hole 仏 from the lower side of the transport sheet 8, and the upper surface of the movable contact 3 is adhered to the lower surface of the surface sheet 5. On the binder. Finally, the through hole 8a is closed by adhering the protective sheet 9 under the conveying sheet 8, and the adhesive sheet 4 is adhered to the bonding sheet 4 (the surface sheet 5 and the spacer are magically removed by the peeling sheet 10 (the conveying sheet 8 and the protective sheet 9) Covering the sheet u with the movable contact on the lower surface of the movable contact 3. Further, the transport sheet 8 and the protective sheet 4 constituting the release sheet (7) are made of a non-magnetic insulating material such as a resin, and are transported and transported. Attached to the reel i 2 before the movable contact 3 of the switch-in switching device is assembled into the switch device, the sheet 11 is wound on the reel i 2. In the middle, the peeling sheet is removed from the sheet w with the movable contact. 〇 (transport sheet 8 and protective sheet 9), the movable contact continued 99123.doc 12 1253661 bonding sheet 4 can be simply and accurately assembled into a predetermined position of the circuit board 2. The switching device thus constructed is flat- When the pressing button is not applied to the movable contact 3, the self-recovering force of the movable contact 3 is separated from the central fixed contact 1 b. Therefore, the peripheral port contact point la and the central fixed contact 1b Disconnected without W. In addition' When a pressing force is applied from the operation key to the movable contact 3, the movable contact 3 is deflected by the pressing force and accompanied by the click feeling. 'Because the movable contact 3 is in contact with the middle contact point 1 b , so the surrounding fixed contact 1 a and the central fixed technology tu

The At 1b is turned on by the movable contact 3 to be turned on. It is also necessary to use the user's finger to operate the movable contact 3 instead of the 刼 key, and in this case, a display portion such as a character or a figure is formed on the surface sheet 5. According to the embodiment of the present invention, since the movable contact 3 is formed of a non-magnetic steel material which is made of SUS305 as a raw material, it is not possible to wear the movable contact 3 near the geomagnetic sensor 7. Bringing a bad magnetic shadow to the geomagnetic sensor 1 This is enough to achieve the locking electrodynamics of the electronic compass that can prevent the malfunction of the geomagnetic sensor 7. In addition, since the movable contact 3 before being incorporated in the switching device is not Since the metal 35' is adsorbed, the contact reliability is not impaired by the adsorption of the metal powder, and the movable contact 3 incorporated in the switching device is covered by the surface sheet 5, so that the contact reliability can be improved from this point. Fig. 5 is a plan view showing a switch device according to a second embodiment of the present invention, and Fig. 6 is a cross-sectional view taken along line (4) of Fig. 5, and Fig. 5 is a plan view showing a wafer and a movable contact of the switch device. The opening of this embodiment is mounted on an electronic device such as a mobile phone or a game machine. A single button switch used on the printed circuit board in the X device, with 99123.doc 1253661

The wafer 13 having the movable contact 12 built therein, the busy body 14 covered on the upper surface of the wafer 13, and the driver 15 for operating the movable contact 12 are technically operated. The wafer 13 is formed by externally molding a central fixed contact 17 made of a non-magnetic conductive material such as SUS305 and a pair of peripheral fixed contacts 18 on a base 16 made of synthetic resin, and two peripheral fixed contacts 18 The terminal 18a protrudes toward the end surface of the susceptor 16. The movable contact 12 is also the same as the movable contact 3 described in the first embodiment. The movable contact 12 is also cold-rolled into a dome shape using SUS305 as a material, and the relative magnetic permeability after cold rolling is measured. 1〇1 or less. The movable contact Η is inserted into the recess i6a of the susceptor 16 for positioning, and the peripheral portion thereof is always in contact with the two peripheral fixed contacts 18, and the central portion is opposed to the central fixed contact 17 at a predetermined interval. Further, the upper surface of the concave portion 16a is closed by a cover sheet 19 made of a non-magnetic insulating film such as poly-resin, so that foreign matter such as dust does not enter the contact portion by the cover sheet 19. The frame u is press-formed on a non-magnetic metal flat plate such as SUS305. The body is bent and formed with an elastic-correcting tongue 14a that protrudes obliquely downward from the upper surface thereof and a second portion that protrudes inward from the side surface. Elastic tongue (4). The casing 4 is fixed to the wafer by means of a bomb H lock or the like, and a driver is disposed between the upper surface of the casing 14 and the cover sheet 19 adhered to the susceptor 16. . The actuator has a driving portion (5) whose front end is formed in a spherical shape, and the driving portion 15a faces the first elastic tongue 丄乜 of the casing 14. In the push button switch configured as described above, when the driver 15 that protrudes toward the side of the wafer B is not pressed, the movable contact 12 is separated from the central fixed contact 17 by the self-restoring force, and the household is fixed by the center (four) and The peripheral fixed contact 18 is not turned on and is turned off. On the other hand, when the driver is operated by pressing C to the inside of the wafer "99123.doc -14 - 1253661, the movable portion 12 is pressed obliquely downward along the i-th elastic tongue ... to press the movable contact 12 The central portion, therefore, the pressing force causes the movable contact 12 to buck, flip and be accompanied by a click feeling. As a result, since the movable contact 12 is in contact with the central fixed contact 117, the central fixed contact and the peripheral fixed contact 18 are electrically connected via the movable contact 12, and are turned on. Further, the driver 15 is removed. After the pressing operation, the driver 15 returns to the original position due to the repulsive force of the first and second elastic tongues (4). The movable contact 12 is also separated from the central fixed contact 17 by the self-restoring force and is again turned off. . The switch device (button switch) of the present embodiment also forms the movable contact 12 by using a non-magnetic stainless steel material made of suS3〇5 as a raw material, so that the metal powder is not adsorbed on the movable contact 12 before being incorporated in the shape device. It is possible to prevent the problem of damage to the reliability of the contact due to the adsorption of the metal powder, and since the movable contact 12 incorporated in the switching device is covered by the cover sheet 19, the reliability of the contact can be improved from this point of view. Further, when the switching device is used in an electronic device such as a mobile phone with an electronic compass in which a geomagnetic sensor is built, it is possible to prevent the movable contact 12 from causing a bad magnetic influence on the geomagnetic sensor. 8 is a cross-sectional view of a switch device according to a third embodiment of the present invention, the switch device having a membrane switch 20 and a pawl spring 21, and the pawl spring 21 is formed by a surface sheet 22 and a spacer 23 24 is held on the membrane switch 2〇. The membrane switch 20 has a pair of upper and lower membranes 26 and 27 integrally laminated with the separator 25 interposed therebetween, and the movable contact 28 and the fixed contact 29 formed on the pair of the upper membranes 26 and 27 are in the through hole 25a of the diaphragm 25. Opposite at regular intervals. The pawl 99123.doc -15-1253661 The spring 21 is the same as the movable contact 3 described in the first embodiment, and the adhesive sheet 24 is also the same as that described in the first embodiment. In other words, the pawl spring 21 is not a movable contact that is a self-contact, and the indirect pre-contact switching operation is a member in which a SUS305 is cold-rolled into a dome-shaped member. The movable contact 3 is structurally identical to the pawl spring 21 of the third embodiment. In the switch device thus constructed, the pawl yellow 21 is held on the upper film 26 by the self-restoring force without being applied to the pawl spring 21 by the repeated force, so the movable contact 28 and the fixed The contact 29 is separated from each other, and the membrane switch 20 is turned off. On the other hand, when the pawl spring 21 is pressed by an operation key (not shown) or a user's finger, the pressing force causes the pawl spring 21 to be deflected and reversed, and the upper film is caused by the inverted pawl spring 21. % is bent downwards. As a result, the movable contact 28 comes into contact with the fixed contact 29, and the membrane switch 2 turns into an ON state. Further, after the pressing force of the pawl spring 21 is removed, the pawl yoke 21 regains its self-recovering force and returns to the dome shape, and the upper film 26 also recovers itself to move the movable contact away from the fixed contact 29. Therefore, the membrane switch 20 is again turned off. In the switch device of the present embodiment, the click spring 21 for imparting a click feeling is formed of a non-magnetic stainless steel material of a material of SUS3〇5. Therefore, even if the switch device is used for a built-in geomagnetic sensor In the case of an electronic device such as a mobile phone with an electronic compass, it is also possible to prevent the click spring 21 from causing a bad magnetic influence on the geomagnetic sensor. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is an exploded perspective view of a switch device according to a first embodiment of the present invention. Fig. 2 is a cross-sectional view of an essential part of the switch device. 99123.doc -16- 1253661 Manufacturer Fig. 3 is an explanatory view showing a sheet sequence of the movable contact for the switch device. Figure 4 is a plan view of the sheet with the movable contact. Fig. 5 is a plan view showing a switch device according to a second embodiment of the present invention. Figure 6 is a cross-sectional view taken along line VI-VI of Figure 5. Fig. 7 is a plan view showing a wafer and a movable contact of the switch device. Fig. 8 is a cross-sectional view showing a switch device according to a third embodiment of the present invention. [Main component symbol description]

1 Fixed contact la Peripheral fixed contact lb Central fixed contact 2 Circuit board 3, 12 Movable contact 4, 24 Adhesive sheet 5, 22 Surface sheet 6 > 23 Separator 6a Through hole 7 Geomagnetic sensor 8 Conveying Sheet 8a Through hole 9 Protective sheet 10 Release sheet 11 Sheet with movable contact 13 Wafer 99123.doc -17- 1253661 14 Frame 14a First elastic tongue 14b Second elastic tongue 15 Driver 15a Drive portion 16 Base 16a

17 18 18a Recessed Center Fixed contact Peripheral fixed contact Terminal 19 Cover sheet 20 Membrane switch 21 Pawl meal 25 Separator 25a Through hole

26 27 Thin film Thin film 28 Movable contact 29 Fixed contact 99123.doc -18·

Claims (1)

1253661 X. Patent application scope: 1. A detent spring, which is characterized in that it can be pushed and retracted from an external pressing force, and can be accompanied by the pressing action of the pressing force, the detent spring system The 仃.n ^ A 粑 material is formed into a dome shape, and its relative magnetic permeability is 101 or less. 2. If the request item is a pawl spring, the upper SUS305. *Metal steel sheet is m.3. 4. Sheet with ratchet cyanine" is characterized in that it has an adhesive sheet, such as the "pawthorn cyanine described in Item 1 or 2", and a non-magnetic peeling sheet, the above-mentioned bonding The crotch sheet has a sheet portion made of a non-magnetic film and an adhesive provided on the lower surface of the sheet portion, and the upper surface of the detent spring is adhered to the adhesive, and the release sheet is adhered to the adhesive sheet. A switch device comprising: an insulating substrate having a fixed contact; and a dome-shaped movable contact capable of contact separation with respect to the fixed contact point, and formed by a non-recorded steel material having a relative magnetic permeability of 101 or less The above-mentioned movable contact. The switch device according to claim 4, wherein the movable contact is formed by SUS305 of JIS standard. 6. The switch of claim 4 or 5, wherein the geomagnetic sensor has detectable geomagnetism And the geomagnetic sensor is disposed on or near the insulating substrate. 7. The switching device of claim 4, wherein the movable contact is disposed on the insulating substrate, In the top sheet made of an insulating film covering the movable contact. 99123.doc