WO2009096404A1 - Ressort en caoutchouc et dispositif d'entrée employant ledit ressort en caoutchouc - Google Patents

Ressort en caoutchouc et dispositif d'entrée employant ledit ressort en caoutchouc Download PDF

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Publication number
WO2009096404A1
WO2009096404A1 PCT/JP2009/051317 JP2009051317W WO2009096404A1 WO 2009096404 A1 WO2009096404 A1 WO 2009096404A1 JP 2009051317 W JP2009051317 W JP 2009051317W WO 2009096404 A1 WO2009096404 A1 WO 2009096404A1
Authority
WO
WIPO (PCT)
Prior art keywords
rubber
rubber spring
comparative example
spring
fluororubber
Prior art date
Application number
PCT/JP2009/051317
Other languages
English (en)
Japanese (ja)
Inventor
Shunetsu Sato
Yoshiro Yoshida
Original Assignee
Alps Electric Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Alps Electric Co., Ltd. filed Critical Alps Electric Co., Ltd.
Priority to JP2009551525A priority Critical patent/JPWO2009096404A1/ja
Publication of WO2009096404A1 publication Critical patent/WO2009096404A1/fr

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/02—Details
    • H01H13/26—Snap-action arrangements depending upon deformation of elastic members
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/02—Details
    • H01H13/26—Snap-action arrangements depending upon deformation of elastic members
    • H01H13/48—Snap-action arrangements depending upon deformation of elastic members using buckling of disc springs
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/50—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a single operating member
    • H01H13/52—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a single operating member the contact returning to its original state immediately upon removal of operating force, e.g. bell-push switch
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/70—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard
    • H01H13/84—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard characterised by ergonomic functions, e.g. for miniature keyboards; characterised by operational sensory functions, e.g. sound feedback
    • H01H13/85—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard characterised by ergonomic functions, e.g. for miniature keyboards; characterised by operational sensory functions, e.g. sound feedback characterised by tactile feedback features
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2209/00—Layers
    • H01H2209/002—Materials
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2215/00—Tactile feedback
    • H01H2215/004—Collapsible dome or bubble
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2227/00—Dimensions; Characteristics
    • H01H2227/022—Collapsable dome
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2227/00—Dimensions; Characteristics
    • H01H2227/03—Hardness
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H5/00—Snap-action arrangements, i.e. in which during a single opening operation or a single closing operation energy is first stored and then released to produce or assist the contact movement
    • H01H5/04—Energy stored by deformation of elastic members
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H5/00—Snap-action arrangements, i.e. in which during a single opening operation or a single closing operation energy is first stored and then released to produce or assist the contact movement
    • H01H5/04—Energy stored by deformation of elastic members
    • H01H5/30—Energy stored by deformation of elastic members by buckling of disc springs

Definitions

  • the present invention relates to a rubber spring which can effectively suppress the generation of a siloxane gas and which is less likely to break compared to a silicone rubber, and an input device using the same.
  • silicone rubber is used as a rubber spring used for the push button switch as shown in the following patent documents.
  • the present invention is intended to solve the above-mentioned conventional problems, and in particular, it is possible to effectively suppress the generation of siloxane gas, and to use a high load rubber spring which is less likely to break compared to silicone rubber.
  • the present invention relates to a rubber spring including a pressing portion and a leg portion which can be bent when the pressing portion is pressed. At least the leg portion is formed of fluororubber.
  • the rubber spring which can suppress generation
  • the fluororubber is preferably formed of a structure having a fluorinated polyether skeleton and a silicone crosslinking reactive group at the end.
  • the whole of the pressing portion and the leg portion is made of the fluororubber, and furthermore, the generation of the siloxane gas can be more effectively suppressed.
  • the rubber hardness of the fluororubber is preferably 70 ° to 90 °. As a result, a high load rubber spring can be more effectively provided.
  • the formation region of the fluorine rubber is formed by heat pressing the fluorine rubber before crosslinking.
  • the input device is provided below the rubber spring described in any of the above, on a movable contact formed of metal pressed downward by the pressing portion, and on the lower side of the movable contact. And a switch unit including the fixed contact.
  • fluorine rubber for the rubber spring, generation of siloxane gas can be effectively suppressed, and stability and long life of input characteristics can be obtained.
  • the leg can be made more difficult to break compared to the prior art.
  • a high load compatible input device that is more resistant to breakage can be realized than when silicone rubber is used.
  • the rubber spring which can suppress generation
  • FIG. 1 is a partial cross-sectional view showing a cut surface of the push button switch (input device) according to the present embodiment cut in the height direction
  • FIG. 2 is a downward direction of a pressing portion of a rubber spring constituting the push button switch shown in FIG. It is a fragmentary sectional view when pressing it.
  • the push button switch 1 in the present embodiment includes a rubber spring 2 and a switch portion 3.
  • the rubber spring 2 includes the pressing portion 4 and a leg portion 5 integrally formed with the pressing portion 4.
  • the upper surface 4a of the pressing portion 4 is a pressing surface formed of a flat surface.
  • the lower surface of the pressing portion 4 is formed with a protruding portion 4 b that protrudes downward.
  • the leg portion 5 is formed in a skirt shape which is formed to extend obliquely downward from the outer periphery of the pressing portion 4, and the lower side of the protruding portion 4 b is hollow.
  • the legs 5 are formed to have an average thickness H1 (about 300 to 400 ⁇ m).
  • the lower edge 5b of the leg 5 is in contact with the substrate 6 as a support.
  • the outer peripheral shape of the rubber spring 2 is substantially frusto-conical.
  • the leg portion 5 is a portion which can be bent when the pressing portion 4 is pressed downward as shown in FIG.
  • the switch unit 3 includes a conductive fixed contact 7 formed on the substrate 6 and a dome-shaped (or convex) movable contact 8 provided so as to cover the upper side of the fixed contact 7.
  • the movable contact 8 is formed of a thin metal plate, and the lower surface 8 a of the movable contact 8 opposed to the fixed contact 7 is a contact portion.
  • the outer peripheral portion 8 b of the movable contact 8 is fixed on the substrate 6.
  • a conductive pattern wired on the substrate 6 is connected to the outer peripheral portion 8b of the movable contact 8 (not shown), and a conductive pattern wired on the lower surface side of the substrate 6 is a through hole in the fixed contact 7 Connected via (not shown).
  • a characteristic part of the rubber spring 2 in the present embodiment is that at least the legs 5 constituting the rubber spring 2 are formed of fluororubber.
  • the fluororubber is formed of a composite of a so-called silicone elastomer and a fluoroelastomer having a fluorinated polyether skeleton and a silicone crosslinking reaction group at the end.
  • the structural formula is shown below.
  • the fluororubber provided with the above structural formula can present, for example, a fluororubber SIFEL 9700 manufactured by Shin-Etsu Chemical.
  • the fluorine rubber having the above structural formula hardly generates siloxane gas due to the structure of the polymer. Moreover, it is superior in chemical resistance to silicone rubber.
  • the whole rubber spring 2 including the pressing portion 4 as well as the leg portion 5 is formed of the above-described fluororubber in the manufacturing process, and that generation of siloxane gas can be more effectively suppressed. .
  • the rubber hardness of the fluororubber is preferably 70 ° to 90 °.
  • the hardness of silicone rubber was measured using a durometer (spring-type rubber hardness meter: CL-150LW type, manufactured by Polymer Measurement Co., Ltd.).
  • a spring-type rubber hardness tester is a measuring device that presses a pressing needle against the surface of a sample with the force of a spring to give deformation, and digitizes the hardness from the “push-in depth” at that time.
  • the rubber spring 2 formed of fluorine rubber for example, draws the fluorine rubber before crosslinking with a roll, draws it out in a shape that can be easily heat-pressed, places the drawn fluorine rubber in a heated mold, and heat presses it. Molded.
  • the generation of siloxane gas can be effectively suppressed as compared with the case where silicone rubber is used as in the prior art.
  • the leg 5 is broken compared to the prior art. It can be difficult. Therefore, in the present embodiment, it is possible to realize the pressing switch 1 (input device) corresponding to a high load that is resistant to breakage, as compared to the case where silicone rubber is used.
  • the fluororubber 11 preferably has a film structure in which a large number of reinforcing materials 21 are dispersed in a polymer 20.
  • the reinforcing material 21 is carbon black or silica (SiO 2 ) particles or the like.
  • the hardness of the fluoro rubber 11 can be increased by increasing the content of the reinforcing material 21 or adjusting the particle size. Therefore, by adjusting the content and particle size of the reinforcing material 21, it is possible to easily and appropriately manufacture the rubber spring 1 capable of coping with a high load.
  • the fluororubber SIFEL 9700 manufactured by Shin-Etsu Chemical Co., Ltd.
  • the stretched fluororubber was cut out into a shape that can be easily heat-pressed, placed in a mold heated to about 175 ° C., and heat-pressed at a pressure of 200 kg / cm 2 for 4 minutes.
  • a notch was formed at the end of the rubber spring sheet by a tearing test cutout cutter (JIS-K-6301A type).
  • the length of the notch was 1 mm.
  • a rubber test piece (comparative example 1) shown in FIG. 4 was formed from a test piece of silicone rubber (12 cm ⁇ 12 cm and a thickness of about 0.3 mm) using a punching cutter (JIS-K-6301A type) for tearing test.
  • the rubber test pieces were prepared for rubber hardness of 50 °, 60 °, 70 °, 75 ° and 80 °, respectively.
  • Tear test As a measuring instrument, Tensilon Universal Testing Instrument (Orientech RTC-1150A) was used. The tear test was performed using this universal testing machine, and the load and displacement (elongation at break) when each test piece of Example and Comparative Example broke were measured. The tear strength of the sample was calculated from the following equation. The speed at which the test piece was pulled was 5 mm / min. In addition, the distance between the clamps on which the test piece was placed was about 50 mm.
  • FIG. 6 is a graph showing the relationship between the thickness and the tear strength of each test piece of Example and Comparative Examples 1 and 2.
  • FIG. 7 is the thickness of each test piece of Example and Comparative Examples 1 and 2. It is a graph which shows the relationship between and the elongation rate to a fracture
  • the rubber hardness of Comparative Example 1 shown in FIG. 6 and FIG. 7 is 70 °, and all of the Example, Comparative Example 1 and Comparative Example 2 have the same rubber hardness of 70 °.
  • FIG. 8 is a graph showing the relationship between the tear strength and the elongation to break of the test pieces of Example and Comparative Examples 1 and 2.
  • the example using the fluororubber was less likely to be broken as compared with the comparative example using the silicone rubber.
  • the example has about twice the tear strength compared to the comparative example 2, The elongation at tearing was about 3 times greater.
  • the example (rubber hardness 70 °) corresponds to the tear strength and the elongation rate of the comparative example 1 having a rubber hardness of 50 °.
  • each test piece is different as shown in FIG. 6 and FIG. 7, comparison can not be made simply, but the example formed of fluororubber is far less likely to break compared to the comparative example formed of silicone rubber. It has been found that the example can realize a high load rubber spring which is more resistant to breakage than the comparative example.
  • the reflow conditions were such that the temperature was gradually raised from 150 degrees to a peak temperature of about 260 degrees, and the reflow completion time was about 3 minutes.
  • the working force of the rubber spring was measured. Moreover, the operating force change rate (%) when the operating force before reflow was made into the reference value was also investigated. As the operating force of the rubber spring, both the operating force without pre-pressing and the operating force after 20 pre-pressings were measured.
  • FIG. 9 shows experimental results of measuring the reflow number dependency of the operating force without pre-pressing for the example and the comparative example 2.
  • FIG. 10 is an experimental result of measuring the reflow number dependency of the rate of change of the operating force without prepressing the example and the comparative example 2.
  • FIG. 11 shows experimental results of measuring the reflow number dependency of the operating force by performing preliminary pressing 20 times for the example and the comparative example 2.
  • FIG. 12 shows experimental results of measuring the reflow frequency dependency of the rate of change of working force by performing preliminary pressing 20 times for the example and the comparative example 2.
  • the operating force is less likely to be reduced by the heat of the rubber spring formed of fluorine rubber, compared to the rubber spring formed of silicone rubber.

Abstract

La présente invention a trait à un ressort en caoutchouc qui est tout particulièrement efficace pour empêcher la génération d'un gaz de siloxane et qui est considérablement moins apte à casser et supporte des charges élevées. La présente invention a également trait à un dispositif d'entrée employant ledit ressort. Le ressort en caoutchouc (2) comprend une partie de pression (4) et une partie formant patte (5) qui peut se courber lorsque la partie de pression (4) est pressée. Au moins la partie formant patte (5) est constituée de fluorocaoutchouc. Le fluorocaoutchouc est de préférence un fluorocaoutchouc formé à partir d'une structure comprenant un squelette polyéther fluoré et un groupe silicone réactif pouvant présenter une double liaison à une extrémité.
PCT/JP2009/051317 2008-01-29 2009-01-28 Ressort en caoutchouc et dispositif d'entrée employant ledit ressort en caoutchouc WO2009096404A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2009551525A JPWO2009096404A1 (ja) 2008-01-29 2009-01-28 ラバースプリング及びそれを用いた入力装置

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2008018196 2008-01-29
JP2008-018196 2008-01-29

Publications (1)

Publication Number Publication Date
WO2009096404A1 true WO2009096404A1 (fr) 2009-08-06

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WO (1) WO2009096404A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019230100A1 (fr) 2018-05-29 2019-12-05 アルプスアルパイン株式会社 Interrupteur à bouton-poussoir

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004235006A (ja) * 2003-01-30 2004-08-19 Matsushita Electric Ind Co Ltd プッシュスイッチ
JP2005197109A (ja) * 2004-01-08 2005-07-21 Shin Etsu Polymer Co Ltd キートップ構造体
JP2007063430A (ja) * 2005-08-31 2007-03-15 Nichias Corp 耐ジメチルエーテル性ゴム部材

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004235006A (ja) * 2003-01-30 2004-08-19 Matsushita Electric Ind Co Ltd プッシュスイッチ
JP2005197109A (ja) * 2004-01-08 2005-07-21 Shin Etsu Polymer Co Ltd キートップ構造体
JP2007063430A (ja) * 2005-08-31 2007-03-15 Nichias Corp 耐ジメチルエーテル性ゴム部材

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019230100A1 (fr) 2018-05-29 2019-12-05 アルプスアルパイン株式会社 Interrupteur à bouton-poussoir
US11309143B2 (en) 2018-05-29 2022-04-19 Alps Alpine Co., Ltd. Push switch

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Publication number Publication date
JPWO2009096404A1 (ja) 2011-05-26

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