JP2007052963A - Switch - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact and thin switch with secure operation mainly used for detecting a recording medium, operation of a mechanism, etc. in various electric devices. <P>SOLUTION: An upper arm part 14C and a lower arm part 14D and a step part 14E connecting them and sloped downward are provided at an upper end extended from a folded part 14A at intermediate of a movable-contact 14. The pressing part 13D is abutted on the lower arm part 14D under the step part 14E while an operating body 13 is pressed and the pressing part 13D is abutted on the upper arm part 14C above the step part 14E while the operating body 13 is returned so that the movable contact 14 is elastically deformed. Thereby, stable electric attaching and detaching and secure operation can be performed and the thin switch can be obtained. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a switch used mainly in various electronic devices for detecting the presence or absence of a recording medium and the operation of a mechanism.

  In recent years, as electronic devices such as video and personal computers have become smaller and more advanced, even in switches used for detecting the presence or absence of recording media such as tapes and disks, or operation of mechanisms such as knobs and doors. There is a demand for a small, thin and reliable operation.

  Such a conventional switch will be described with reference to FIGS.

  FIG. 4 is a cross-sectional view of a conventional switch. In FIG. 4, 1 is a substantially box-shaped case made of insulating resin and having an upper surface opening, 2 is a fixed contact made of a conductive metal thin plate, and a plurality of fixed contacts 2 are cases 1. In addition to being implanted and fixed to the inner bottom surface by insert molding or the like, the terminal portions (not shown) each extend outward.

  Reference numeral 3 denotes an operation body made of insulating resin, which is housed in the case 1 so as to be swingable with the left end fulcrum 3A as a fulcrum, and the operation part 3B formed on the right end is located above the opening on the upper surface of the case 1 Protruding to

  Further, 4 is a movable contact made of an elastic metal thin plate with a bent middle portion, and is housed in the case 1 in a slightly bent state, and a contact portion 4A extending to the lower end is elastically contacted with the inner bottom surface of the case 1. Yes.

  The tip of the arm portion 4B extending to the upper end of the movable contact 4 is in elastic contact with the holding portion 3C on the lower surface of the fulcrum portion 3A of the operating body 3, and the arm portion 4B has an intermediate portion below the operating portion 3B of the operating body 3B. The pressing portion 3D formed in the contact is in contact.

  Reference numeral 5 denotes a cover made of a thin metal plate. The cover 5 covers the opening on the upper surface of the case 1 and the operation portion 3B of the operation body 3 protrudes upward from the through hole on the upper surface of the cover 5 to constitute a switch. Yes.

  And the switch comprised in this way is mounted on the wiring board (not shown) in which the several wiring pattern was formed in the upper and lower surfaces, and the terminal part of the fixed contact 2 extended from the case 1 is predetermined. Are soldered to the wiring pattern and electrically connected to the electronic circuit of the device.

  In the above configuration, when the operating portion 3B protruding upward from the case 1 is pressed by a mechanism such as a knob or a door, such as insertion or extraction of a recording medium such as a tape or a disk, as shown in the cross-sectional view of FIG. The operating body 3 swings downward with the fulcrum part 3A as a fulcrum.

  As a result, the intermediate portion of the arm portion 4B of the movable contact 4 is pressed by the pressing portion 3D of the operating body 3, and the contact portion 4A at the lower end of the movable contact 4 that is elastically contacted with the inner bottom surface of the case 1 moves toward the fixed contact 2. 1. Sliding elastically on the inner bottom surface.

  When the operation portion 3B is pressed by a predetermined amount, the contact portion 4A comes into elastic contact with the upper surface of the fixed contact 2, and the plurality of fixed contacts 2 are electrically connected via the movable contact 4.

  When the operating force on the operating body 3 is released, the operating body 3 is pushed upward by the elastic return force of the movable contact 4 and swings, and the contact portion 4A also moves from the fixed contact 2 to the inside of the case 1. It is configured to return to the state of FIG. 4 in which the plurality of fixed contacts 2 are cut off by elastically sliding to the bottom surface.

  That is, by pressing operation of the operating body 3, the arm portion 4B is pressed by the pressing portion 3D and the movable contact 4 is elastically deformed, and the fixed contact of the contact portion 4A during the pressing operation by the elastic force due to the bending of the movable contact 4 2. The elastic contact force to the upper surface and the return force of the operating body 3 when the operating force is released can be obtained.

  When the switch is to be reduced in size and thickness, particularly in the vertical direction, if the bending angle of the intermediate portion of the movable contact 4 is made small, the operating body that contacts the arm portion 4B correspondingly. 3, the position of the holding portion 3 </ b> C and the pressing portion 3 </ b> D can be lowered to reduce the thickness, but the amount of bending of the entire movable contact 4 is also reduced accordingly.

  Therefore, in the state in which the operation unit 3B in FIG. 5 is pressed, the force with which the contact unit 4A elastically contacts the upper surface of the fixed contact 2 is small, and in the state in which the operation unit 3 in FIG. The force that urges to become small.

As prior art document information related to the invention of this application, for example, Patent Document 1 is known.
JP-A-2005-26035

  However, in the conventional switch described above, in order to reduce the thickness, if the bending angle of the intermediate portion of the movable contact 4 is reduced, the amount of bending of the entire movable contact 4 is also reduced, and the contact portion 4A elastically contacts the upper surface of the fixed contact 2. There is a problem that the force and the force for urging the operation body 3 upward become small, and it becomes difficult to perform stable electrical contact and separation as a switch and reliable operation.

  The present invention solves such a conventional problem, and an object of the present invention is to provide a switch that can be reduced in size and thickness and has reliable operation.

  In order to achieve the above object, the present invention provides an upper arm part and a lower arm part at the upper end extended from the bent part in the middle of the movable contact, and a step part inclined downward to connect them, and a lower arm part. The switch is configured by bringing the tip into contact with the holding part on the lower surface of the fulcrum part of the operating body and the upper arm part in contact with the pressing part below the operating part of the operating body. When the operating body is returned to the lower arm part below the step part, the pressing part comes into contact with the upper arm part above the step part and the movable contact is elastically deformed. Stable electrical contact and separation and reliable operation can be performed without reducing the elastic contact force or force that urges the operating body upward, and the overall height difference between the upper arm and lower arm is reduced. I can get a switch that can It is having an effect.

  As described above, according to the present invention, it is possible to achieve an advantageous effect that it is possible to realize a switch that can be reduced in size and thickness and can be reliably operated.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

  In addition, the same code | symbol is attached | subjected to the part of the structure same as the structure demonstrated in the term of background art, and detailed description is simplified.

(Embodiment 1)
FIG. 1 is a cross-sectional view of a switch according to an embodiment of the present invention, and FIG. 2 is an exploded perspective view thereof. In the figure, 11 is a substantially box shape made of an insulating resin such as liquid crystal polymer or polyphenylene sulfite. The case 2 is a fixed contact made of a conductive metal thin plate such as a copper alloy. A plurality of fixed contacts 2 are implanted and fixed on the inner bottom surface of the case 11 by insert molding or the like, and the terminal portions 2A are respectively outward. It is extended.

  Reference numeral 13 denotes an operating body made of an insulating resin such as liquid crystal polymer or nylon. The operating body 13 is housed in the case 11 so as to be swingable with the fulcrum portion 13A at the left end as a fulcrum, and the operating portion 13B formed at the right end is the case 11. It protrudes upward from the opening on the upper surface.

  A movable contact 14 made of an elastic metal thin plate such as a copper alloy is housed in the case 11 in a slightly bent state, and a substantially U-shaped bent portion 14A is formed in the middle. A substantially arc-shaped contact portion 14B extending from the curved portion 14A to the lower end is in elastic contact with the inner bottom surface of the case 11.

  Further, an upper arm portion 14C, a lower arm portion 14D, and a stepped portion 14E inclined downward to connect them are provided at the upper end extending from the bent portion 14A. The upper arm portion 14C and the lower arm portion A step is formed between 14D, the tip of the lower arm portion 14D is at the holding portion 13C on the lower surface of the fulcrum portion 13A of the operating body 13, and the upper arm portion 14C is a pressing portion formed below the operating portion 13B of the operating body 13. Each is in elastic contact with 13D.

  Reference numeral 5 denotes a cover made of a thin metal plate such as a steel plate. The cover 5 covers the opening on the upper surface of the case 11, and the operation portion 13B of the operation body 13 projects upward from the through hole on the upper surface of the cover 5, so that the switch It is configured.

  Note that the switch configured in this manner is smaller in height of the case 11 than the switch described in the background art section because of the step difference between the upper arm portion 14C and the lower arm portion 14D. The thickness has been reduced.

  Such a switch is placed on a wiring board (not shown) having a plurality of wiring patterns formed on the upper and lower surfaces, and the terminal portion 2A of the fixed contact 2 extending from the case 11 is connected to a predetermined wiring. It is soldered to the pattern and electrically connected to the electronic circuit of the device.

  In the above configuration, when the operation portion 13B protruding upward from the case 11 is pressed by the insertion / extraction of a recording medium such as a tape or a disk, or a mechanism such as a knob or a door, as shown in the cross-sectional view of FIG. The operating body 13 swings downward with the fulcrum part 13A as a fulcrum.

  As a result, the upper arm portion 14C of the movable contact 14 is pressed by the pressing portion 13D of the operating body 13, the intermediate bent portion 14A is bent, and the contact portion 14B at the lower end of the movable contact 14 that is elastically contacted with the inner bottom surface of the case 11 is obtained. However, it slides elastically on the bottom surface of the case 11 in the direction of the fixed contact 2.

  As the movable contact 14 swings, the pressing portion 13D slides elastically from the upper arm portion 14C through the step portion 14E, presses the lower arm portion 14D, and the operating portion 13B is pressed by a predetermined amount. Then, the contact portion 14 </ b> B elastically contacts the upper surface of the fixed contact 2, and the plurality of fixed contacts 2 are electrically connected via the movable contact 14.

  At this time, since the pressing portion 13D presses the lower arm portion 14D at a position lower than the upper arm portion 14C, the movable contact 14 is bent, and the contact portion 14B elastically contacts the upper surface of the fixed contact 2 by this force. The elastic contact force of the contact portion 14B on the upper surface of the fixed contact 2 is equivalent to the switch described in the background art section.

  When the operating force on the operating body 13 is released, the operating body 13 is pressed upward by the elastic return force of the movable contact 14 and swings, and the contact portion 14B is also moved from the fixed contact 2 into the case 11. The state returns to the state of FIG. 4 in which the plurality of fixed contacts 2 are disconnected by elastically sliding to the bottom surface.

  At this time, the pressing portion 13D slides elastically from the lower arm portion 14D through the step portion 14E, presses the upper arm portion 14C at a position higher than the lower arm portion 14D, and the movable contact 14 is bent, Since the operating body 13 is urged upward by this force, the urging force of the operating body 13 at the time of return is equivalent to the switch described in the background art section.

  That is, by providing the upper arm portion 14C and the lower arm portion 14D connected by the stepped portion 14E inclined downward at the upper end of the movable contact 14 extending from the intermediate bent portion 14A, the switch can be thinned in the vertical direction. However, when the operating body 13 is pressed, the pressing portion 13D touches the lower arm portion 14D, and when the operating body 13 returns, the pressing portion 13D touches the upper arm portion 14C. By making contact, the elastic contact force of the contact portion 14A on the upper surface of the fixed contact 2 during the pressing operation and the return force of the operating body 13 when the operation force is released have the same force as the switch described in the background section. It is configured to be obtained.

  As described above, according to the present embodiment, the upper arm portion 14C and the lower arm portion 14D, and the step portion 14E inclined downward to connect them are provided at the upper end extending from the bent portion 14A in the middle of the movable contact 14. At the same time, when the operating body 13 is pressed, the pressing portion 13D moves to the lower arm portion 14D below the stepped portion 14E, and when the operating body 13 returns, the pressing portion 13D moves to the upper arm portion 14C above the stepped portion 14E. By making each contact and elastically deform the movable contact 14, it is possible to achieve a stable electrical operation without reducing the elastic contact force of the contact portion 14B to the upper surface of the fixed contact 2 and the force for urging the operating body 13 upward. In addition to being able to perform contact and separation and reliable operation, the entire switch can be thinned by the level difference between the upper arm portion 14C and the lower arm portion 14D.

  The switch according to the present invention can be reduced in size and thickness and has a reliable operation, and is useful mainly as a detection switch for various electronic devices.

Sectional drawing of the switch by one embodiment of this invention Exploded perspective view Sectional view during pressing operation Cross section of conventional switch Sectional view during pressing operation

Explanation of symbols

2 fixed contact 2A terminal part 5 cover 11 case 13 operation body 13A fulcrum part 13B operation part 13C holding part 13D pressing part 14 movable contact 14A bent part 14B contact part 14C upper arm part 14D lower arm part 14E step part

Claims (1)

A box-shaped case with a top opening with a fixed contact planted on the inner bottom, and a swingable case with one end as a fulcrum inside this case, with the other end projecting upward from the opening of the case And a contact portion extending from the middle bent portion to the lower end is a movable contact elastically contacting the bottom surface of the case, and an upper arm portion and a lower portion are arranged at the upper end extending from the bent portion of the movable contact. Provided are an arm part and a step part inclined downward to connect them, the lower arm part tip is pressed against the holding part on the lower surface of the fulcrum part of the operating body, and the upper arm part is pressed below the operating part of the operating body Switch that is in contact with the part.

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