TWI228737B - Push button switch - Google Patents

Abstract

The invention provides a push button switch capable of making the width of surrounding fixed contacts smaller and sufficiently ensuring design freedom for contact portion including surrounding fixed contacts. The invention comprises surrounding fixed contacts 2 embedded and formed in the cover 1, a central fixed contact 3, a movable contact plate 4 including thin metal plate, a substrate part 4a and a hook latch 4b, a rubber spring 5 installed on the movable contact plate 4 making the hook latch 4b in contact with the central fixed contact 3, a center shaft 6 used to perform pressing operation to the rubber spring 5 and form a part of a sphere installed on substrate part of the movable contact plate 4 and a convex part 4c used to constantly contact with the surrounding fixed contact 2.

Description

1228737 Description of attack and invention: [Technical field to which the invention belongs] The present invention relates to a point switch connected to a tongue of a movable contact plate that contacts a substrate portion of various electronic devices. [Technology] A point-type push button switch is installed in a state that is always kept in contact with the surrounding fixed contacts and is fixed by the center of a rubber spring. The nine-shell switch box, that is, the shell, is provided on the bottom periphery of the shell with a common fixed contact having a convex portion, a fixed contact around the periphery, and a central fixed contact arranged in the center of the bottom of the shell. The peripheral fixed contact and the central fixed contact are installed in the housing by insert molding. In addition, the "movable contact plate" is also formed of a thin metal plate, which is housed in a housing, and has a substrate portion that is constantly kept in contact with the surrounding fixed contacts, and the substrate portion A tongue piece that extends upward in a cantilever shape and is arranged so as to be able to contact and separate from the central fixed contact. Furthermore, it also has a dome-shaped spring body that is installed in the housing, the leg portion of which is placed on the base plate portion of the movable contact plate, and the tongue piece contacts the central fixed contact point under pressure, that is, rubber A spring; and a button for pressing a rubber spring, a stem. In the prior art, when the stem is pressed, the rubber spring flexes and presses the tongue of the movable contact plate, and the tongue contacts the central fixed contact. As a result, the central fixed contact and the surrounding fixed contacts are conducted through the movable contact board, and become closed O: \ 86 \ 86252.DOC -6-1228737, that is, connected. When the pressing force applied to the stem is released, the rubber spring returns to its original shape, and the pressing force applied to the tongue of the movable contact plate is released. The tongue uses its own elastic force to leave the central fixed contact and the central fixed The contact and the surrounding fixed contacts are cut off and become open, that is, disconnected. [Problems to be Solved by the Invention] In the above-mentioned prior art, a convex portion is provided on a peripheral fixed contact, and the convex portion maintains stable contact between the peripheral fixed contact and the substrate portion of the movable contact plate. ~ &Quot; However, in the above-mentioned prior art, in order to prevent the convex portions of the surrounding fixed contacts from being covered by resin during insert molding, it is necessary to use a mold having concave portions suitable for the shape of the convex portions to fix the convex portions of the surrounding fixed contacts. It is housed in this recessed part, and insert-molding is performed in a state where a portion of the periphery of the fixed contact other than the convex part is in contact with the mold. u Therefore, it is necessary to leave a margin in advance for the width of the fixed contacts around it. The size of this margin and the plate thickness of the mold forming the recessed part, that is, the size of the width of the peripheral core contact is increased in the W technique. Big. There is a problem that the size of the overall shape is limited. In addition, due to the relationship of the surrounding fixed contacts in the housing, the position where the convex portion is provided can be limited to a specific position. In addition, if the contact with the movable old point plate is more reliable, a peripheral fixed contact & a convex portion is provided on the part of the passenger, the shape of the peripheral fixed contact, and a recess matching the convex portion. The shape of the tone mold becomes complicated. #

The number of protrusions that scare Λ 5 is also placed around the fixed contact J is also limited. 1 For this, in the advancement technique, including eyebrows

O: \ 86 \ 86252.DOC 1228737 The degree of freedom in designing the contact portion including the fixed contact is limited. Therefore, it is difficult to obtain high-precision switching performance and form a highly reliable switching structure. [Summary of the Invention] The present invention is a solution proposed according to the actual situation of the foregoing prior art. The purpose of the present invention is to provide a small size of the width of the surrounding fixed contacts and to fully ensure the contact portion including the surrounding fixed contacts. Buttons for design freedom. [Means for solving the problem] In order to achieve the above-mentioned object, the present invention is characterized by having a casing forming an outer casing, fixed contacts disposed around the bottom periphery of the casing, and a central fixed contact disposed at the center of the bottom of the casing; In addition, it has a movable contact plate which is housed in the housing and is made of a thin metal plate. The movable contact plate has a substrate portion which is constantly kept in contact with the surrounding fixed contacts, and the substrate portion is interposed therebetween. A tongue that extends upward in a cantilever shape and is configured to be in contact with and detachable from the central fixed contact; and a 'rubber yellow' which is installed in the housing and the foot is placed on the movable contact A pressing force is applied to the base plate portion of the plate to bring the tongue into contact with the central fixed contact; and a stem is movably mounted in the housing for pressing the rubber spring; and, A convex portion is provided on the substrate portion of the movable contact plate to be in contact with the surrounding fixed contacts. In the present invention thus constituted, the substrate portion of the movable contact plate can always be kept in contact with the surroundings through the convex portion provided on the substrate portion of the movable contact plate.

O: \ 86 \ 86252.DOC 1228737 The fixed contacts are in contact. That is, it is possible to reliably make contact between the substrate portion of the movable contact plate and the fixed contacts around the periphery. In addition, since the convex portion is provided on the substrate portion of the movable contact plate, peripheral fixed contacts can be formed in advance on the surface without the convex portion. Therefore, it is not necessary to form a recessed portion in the mold for accommodating the convex portion formed on the peripheral fixed contact. ^ The width dimension of the peripheral fixed contact point is set to be small. The thickness of the mold is related to the dimensions. In addition, the shape of the convex portion in the substrate portion of the movable contact plate can be processed together while processing the thin metal plate when manufacturing the movable contact plate, making # simple. In addition, the convex portion can be easily formed in a required number of positions on the substrate portion of the movable contact board opposite to the surrounding fixed contacts, and the surrounding fixed contacts can be sufficiently ensured. Design freedom of the contact part. ~ This: Bu, the present invention is characterized in that in the above invention, the convex portion is provided in a shape forming a part of a sphere. The invention thus constituted allows the convex portion to always be kept in point contact with the surrounding fixed contacts. . % In addition, the present invention is characterized in that a plurality of the convex portions are provided on the substrate portion portion on the tongue side of the upwardly bent portion of the movable contact plate. In the present invention thus constituted, when the tongue is brought into contact with the central fixed contact by pressing by a rubber spring, a part of the pressing force is transmitted to a portion of the substrate portion on the tongue side with respect to the upward bent portion of the movable contact plate. This substrate portion tends to be pressed against the surrounding fixed contacts. So that

O: \ 86 \ 86252.DOC 1228737 There is a reliable connection between the fixed contacts to ensure that the convex portion provided on the substrate portion and the surrounding area have sufficient contact pressure, which can make the convex portion and the surrounding fixed contacts. The invention is characterized in that: one of the tongue piece and the central fixed contact point. In the above-mentioned invention, the present invention constituted by the lower surface where the uneven portion is provided with a fixed contact point and the above-mentioned central portion enables dust to be retained in the concave portion of the uneven portion even if the dust invades between w and the central fixed contact point. The convex part makes the tongue piece and the fixed contact of the harrow central contact reliably. In addition, the present invention is characterized in that, in the above invention, the rubber knee elastic has a pressing force β ′ for performing a ㈣ operation on the tongue of the movable contact plate, and 纟 is provided on the upper surface of the tongue to be able to contact the Press the convex part of the dust part. According to the present invention thus constituted, the above-mentioned convex portion provided on the tongue piece can be used to prevent the pressing portion of the rubber knee elastic from sticking with the tongue piece as the number of rubber bomb presses increases. Further, the above-mentioned convex portion system capable of contacting the pressing portion can be formed at the same time as pressing the metal thin plate when manufacturing the movable contact plate. [Embodiment] Hereinafter, an embodiment of a push button switch according to the present invention will be described in detail with reference to the drawings. 1 to 6 are explanatory views showing an embodiment of the present invention, and FIG. 1 is a longitudinal sectional view showing the embodiment; FIG. 2 is an enlarged view of a portion A of FIG. 1; Part B is an enlarged view; FIG. 4 is a plan view showing a movable contact plate of the present embodiment; FIG. 5 is an enlarged view of a section C-C of FIG. 4; and FIG. 6 is a fixed contact of the present embodiment. Top view of a silver-inlayed housing. O: \ 86 \ 86252.DOC -10-1228737 The embodiment of the present invention is shown in Fig. 1. It has a casing 1 forming an outer casing 1. The periphery of the casing 1 is arranged around the bottom of the casing 1 and serves as a common fixed contact.疋 contact 2, and a central fixed contact 3 arranged at the center of the bottom of the housing 1. As shown in FIG. 6, the peripheral fixed joint 2 and the central fixed contact 3 are inserted into the casing 1. The upper surface of the peripheral fixed contact 2 is formed in advance as a flat surface without convex portions. In addition, as shown in FIG. 1, there is a movable contact plate 4 which is installed in the above-mentioned housing 1 and is made of a thin metal plate, which has a substrate portion which always keeps contact with the surrounding fixed contacts _2 4a, and a tongue piece 4b extending from the base plate portion 4a into a cantilever shape by the instrument | upward bending portion 4f and arranged so as to be able to contact and separate from the central fixed contact 3. The housing 1 on the upper side of the movable contact plate 4 is provided with a rubber spring 5 which is in contact with the center fixed contact 3 of the tongue 4b by receiving a pressing force. The rubber impeaches $ feet.卩 5a 女 I is on the board portion 4 & of the movable contact board 4. A pressing portion 5b for pressing the tongue of the movable contact plate 4 into contact with the central fixed contact 3 is provided on the central portion of the rubber spring. In addition, it has a stem 6 which is mounted in the housing 1 and is movable, and presses the rubber bomb 5. In particular, as shown in FIG. 2 in which the A part of FIG. 1 is enlarged in the present embodiment, a protrusion that contacts the surrounding fixed contacts 2 is provided under the substrate part 4 a of the movable contact plate 4, and the shape is set to, for example, Convex part of a sphere. This convex portion 4c is always kept in point contact with the surrounding fixed contacts 2. As shown in FIG. 4, the convex portion 4c is provided with a plurality of upward curved portions 4f 'of the movable contact plate 4 on a portion of the substrate portion 乜 located on the tongue 4b side, for example.

O: \ 86 \ 86252.DOC -11-1228737 There are four. Two of these four convex portions 4c are located, for example, on the imaginary line passing substantially horizontally through the center of the movable contact plate 4, and the remaining two are located near the front end portion of the tongue piece. All or a part of these convex portions 4C are always kept in point contact with the surrounding fixed contacts 2. In addition, under the tongue piece 4b of the movable contact plate 4, as shown in FIG. 3, FIG. 4 and FIG. 5 in which part b of FIG. I is enlarged, for example, the same shape as the convex portion 4c of the substrate portion 乜 is provided. Three convex portions 4d. These convex portions 牝 are, for example, located around the central portion of the tongue piece, and are equally spaced from each other. All or a part of these convex portions 能够 can be brought into point contact with the central fixed contact 3. By providing the above-mentioned three convex portions 4d, a concave-convex portion is formed on the lower surface of the tongue piece 4b of the movable contact plate 4 opposed to the central fixed contact 3. That is, the convex portion in the uneven portion is three convex portions 4d, and the concave portion in the uneven portion is a space portion including the lower surface of the tongue piece 4b formed around the convex portion 4d. In addition, as shown in Figs. 3 and 4, a tongue portion 4b of the movable contact plate 4 facing the pressing portion 5b of the rubber spring 5 is provided with a convex portion 4e capable of contacting the pressing portion 5b. The convex portion 牦 provided on the upper surface of the tongue piece is also set to have the same shape as the convex portion 4d provided on the lower face of the tongue piece 4b, for example, and is located at the center of the tongue piece 4b. In the present embodiment configured as described above, the elasticity of the leg portion 5a of the rubber spring 5 housed in a manner restricted by the stem 6 in the housing 1 keeps the substrate portion 4a of the movable contact plate 4 in contact with the substrate. Around the fixed contact 2. That is, all or a part of the four convex portions 4c provided on the lower surface of the base plate portion 4a are always kept in point contact with the surrounding fixed contacts 2. When the stem 6 is pressed from this state, the rubber spring 5 is flexed, and the pressing portion 讣

O: \ 86 \ 86252.DOC -12- 1228737 The tongue 4b is pressed by the convex portion 4e provided on the tongue patch of the movable contact plate 4. All or a part of the three convex portions provided under the tongue 讣 are in point contact with the central fixed contact. In this way, the central fixed contact 3 and the surrounding fixed contacts 2 are conducted through the movable contact plate 4 and closed, that is, connected. In addition, if the pressing force applied to the stem 6 is removed from the above-mentioned state, the rubber elastic yellow 5 returns to its original shape, and the pressing force applied to the tongue of the movable contact plate 4 is released. In this way, the tongue piece 4b, that is, the convex part of the tongue piece 4b assists the elastic force of the tongue piece 4b to leave the central fixed contact point 3, and cuts off between the central fixed contact point 3 and the surrounding fixed contact points 2. , Becomes open, that is, disconnected. In this embodiment thus constituted, as described above, the convex portion 乜 provided on the lower surface of the substrate portion 牦 of the movable contact plate 4 can always be kept in point contact with the surrounding fixed contacts 2. That is, the board portion 牦 of the movable contact plate 4 and the surrounding fixed contacts 2 can be reliably brought into contact. In addition, when the tongue piece 4b is brought into contact with the central fixed contact point 3 by pressing with the rubber spring 5, a part of the pressing force is transmitted to the substrate on the tongue piece 4b side opposite to the upward bent portion 4f of the movable contact plate 々. The part of the base part tends to press the part of the substrate part 4a onto the surrounding fixed contact 2. In this embodiment, δ is provided with four convex portions 4c and positioned on the portion of the substrate portion 4a that is pressed on the surrounding fixed contact 2 at this time. Therefore, even when the tongue piece 4b is pressed, In this way, the convex portion 4C is reliably brought into contact with the surrounding fixed contacts 2. In addition, even if dust enters between the lower surface of the tongue of the movable contact plate 4 and the central fixed contact 3, the dust can be kept in the space around the three convex portions 4d provided on the lower surface of the tongue. . That is, even when dust enters, the convex portion 4d can be used to make the tongue contact with the central fixed contact 3 O: \ 86 \ 86252.DOC -13-1228737. As described above, in the present embodiment, the convex portion 4c provided below the substrate portion 4a of the movable contact plate 4 allows the substrate portion 4a of the movable contact plate 4 and the surrounding fixed contacts 2 to always be reliably maintained. contact. In addition, the convex portion 4d 'provided on the lower surface of the tongue piece 4b enables the tongue piece 4b and the central fixed contact 3 to be reliably brought into contact with each other. In addition, in the present embodiment, since the convex portion 4c is provided on the substrate portion 4a of the movable contact plate 4, as described above, the flat surface of the peripheral fixed contact 2 can be formed in advance with no convex portion or more. So when in the shell! When the inner fixed contact 2 and the central fixed contact 3 are formed by insert molding, it is not necessary to form a recess in the mold to accommodate the convex portion formed on the peripheral fixed contact 2, and the width of the peripheral fixed contact 2 can be reduced. The reduced size is a size related to the plate thickness of the mold forming the recess. In this way, the overall shape can be miniaturized. In addition, in this embodiment, the protrusion 44c j in the substrate portion 乜 of the movable contact plate 4 can be formed at the same time as the abutment processing of the thin metal plate when the movable contact plate 4 having the substrate portion 乜 and the tongue piece is manufactured. , Easy to make. Furthermore, it is easy to form a predetermined number of convex portions 上 at a desired position of the substrate portion 4a of the movable contact plate 4. Thereby, the degree of freedom in designing the contact portion including the surrounding fixed contact 2 can be sufficiently ensured. Therefore, as described above, high-precision switching performance can be ensured, and a highly reliable switching structure can be formed. Furthermore, in this embodiment, the convex portion 7 provided on the upper surface of the tongue piece 4b can prevent the pressing material of the rubber spring 5 and the tongue piece from sticking with the pressing of the rubber elastic yellow 5, which helps to ensure high reliability. Switch structure. Furthermore, the convex portion 4e provided on the upper surface of the tongue piece 4b and the tongue portion 4e provided on the tongue piece 4b.

O: \ 86 \ 86252.DOC -14- 1228737 The convex portions 4d on the lower surface can be easily formed at the same time when the metal thin plate is manufactured when the movable contact plate 4 is manufactured. In addition, as described above, since the convex portion ^ is provided on the upper surface of the tongue piece, when the rubber spring 5 is pressed, as the rubber spring 5 is deformed, the center portion and the convex portion 的 of the pressing portion 5b of the rubber spring 5 are deformed. When the positions are not the same, the pressing portion 5b is inclined, and a part of the outside of the pressing portion is strongly pressed by the tongue blade. Therefore, the convex portion 4d located near a position where a part of the pressing portion 5b is strongly pressed by the tongue 4b is brought into contact with the central fixed contact 3 with a large contact pressure. In this way, the convex part 牦 can be brought into strong point contact with the central fixed contact 3, and the tongue piece and the central fixed contact 3 can be more reliably contacted, which helps to ensure high-precision switching performance. Furthermore, in this embodiment, as described above, since the convex and concave portions are formed on the lower surface of the tongue 4b by the three convex portions 4d provided on the lower surface of the tongue 4b, it is possible to prevent the tongue 4 and Poor contact between the central fixed contacts 3 due to the ingress of dust helps to ensure high-precision switching performance. Furthermore, in the above-mentioned embodiment, although three convex portions 4d are provided under the tongue piece 4b of the movable contact plate 4, and concave and convex portions are formed under the tongue piece, such concave and convex portions may be provided in The upper surface of the central fixed contact 3 is not provided under the tongue piece 4b. With such a structure, the dust that enters between the tongue piece 4b and the central fixed contact point 3 can be kept in the recessed portion of the concave-convex portion. The convex portion of the concave-convex portion can ensure the tongue piece 4b and the central fixed contact point 3 reliably. Ground contact. Further, in the above-mentioned embodiment, since no convex portion is provided on the peripheral fixed contact 2, the width dimension of the peripheral fixed contact 2 can be set to be small,

O: \ 86 \ 86252.DOC -15- 1228737 This enables miniaturization of the overall shape. However, when the overall shape is the same as in the past, since the width dimension of the peripheral fixed contact 2 can be set smaller, the central fixed contact 3 can be set larger than in the past. In the case of such a structure, the contact area between the tongue piece and the central fixed contact point 3 of the movable contact plate 4 can be sufficiently ensured, and the tongue piece and the central fixed contact point 3 can be more reliably contacted. [Effects of the Invention] As described above, in the present invention, since a convex portion that is in contact with the surrounding fixed contacts ~ points is provided on the substrate portion of the movable contact plate, the set width dimension of the surrounding fixed contacts can be reduced. Compared with the past, the overall shape can be miniaturized. In addition, the convex portion can be formed at the same time as the movable contact plate is manufactured, and the manufacturing is simple, and at the same time, the degree of freedom in designing the contact portion including the surrounding fixed contacts can be sufficiently ensured. In this way, the contact between the movable contact plate and the surrounding fixed contacts can be surely performed, high-precision switching performance can be ensured, and a more reliable switching structure can be formed compared with the past. / Furthermore, in the present invention, the convex portion is set in a band shape forming a sphere-part. In this way, the convex portion can always be kept in point contact with the surrounding fixed contacts: the substrate portion of the movable contact board and the surrounding fixed contacts are in contact with each other to ensure high-precision switching performance. -; __ β The part of the base plate portion on the tongue side of the upward bending portion of the above-mentioned point plate. 'Even when the spring is pressed, the sufficient contact pressure of the convex portion can be obtained, which helps Accuracy

O: \ 86 \ 86252.DOC -16-1228737 In addition, the present invention is provided with a concave-convex portion on one of the lower surface of the tongue facing the central fixed contact and the central fixed contact. In this way, even if the fire dust enters between the ij tongue piece and the central HJ fixed contact ', the dust can be held in the concave portion of the concave and convex portion, and the tongue piece and the central fixed contact can be reliably contacted by the convex portion of the concave and convex portion. In other words, it is possible to prevent contact between the tongue and the central fixed contact due to dust, and help to ensure a high-precision switchability. Furthermore, the rubber spring of the present invention has a tongue for the movable contact plate. The pressing portion is a reducing portion, and a convex portion capable of contacting the pressing portion is provided on the upper surface of the tongue. The convex part can prevent the embarrassment of the government 丨 month b | Wanzhi rubber I spring adhesion of the pressing part and the tongue, helping to ensure a highly reliable switch structure. [Brief Description of the Drawings] Fig. 1 is a longitudinal sectional view showing an embodiment of a push button switch according to the present invention. FIG. 2 is an enlarged view of part A of FIG. 1. FIG. 3 is an enlarged view of part B of FIG. 1. FIG. 4 is a plan view of a movable contact plate shown in FIG. 1, a mouth τ τ π π, and a movable contact plate included in the Shewan type. FIG. 5 is an enlarged view taken along the line C-C in FIG. 4. Fig. 6 is a plan view showing an under-molded case in which fixed contacts provided in one embodiment shown are inlaid. [Illustration of Symbols in the Drawings] 1 Enclosure 2 Fixed contacts around

O: \ 86 \ 86252.DOC -17- 1228737 3 Central fixed contact 4 Movable contact plate 4 d Base plate portion 4b Tongue 4c Convex portion 4d Convex portion 4e Convex portion 4f Bend upward 5 Rubber zen spring 5a Foot 5b Pressing section 6 stem O: \ 86 \ 86252.DOC -18

Claims (1)

1228737 Patent application park: 1 · A button switch, which is characterized by having:… a shell forming an outer shell; fixed fixed contacts arranged around the bottom periphery of the shell; a central fixed joint arranged at the bottom center of the shell A movable contact plate, which is housed in the housing, is made of a thin metal plate, has a base plate portion that always keeps in contact with the surrounding fixed contacts, and extends from the base plate portion to a cantilever through an upward f-curved portion Tongue shaped and arranged to be in contact with and detachable from the central fixed contact; a rubber bullet ... 'It is housed in the housing, and its feet are placed on the substrate portion of the movable contact board, receiving The tongue is brought into contact with the central fixed contact point by pressing; and 心 ... a stem, which is movably mounted on the housing μ, and presses the rubber spring forcefully; ^ and in the above-mentioned movable contact plate, A convex portion is provided on the substrate portion to be in contact with the surrounding fixed contact. 2. = Button switch No. 1 in the scope of patent application, wherein the convex portion is set to a shape forming a part of a sphere. 3. If the scope of patent application is the first! In the button switch of the item, a plurality of the convex portions are provided on a portion of the base plate portion on the tongue side with respect to the upward curved portion of the movable contact plate. (For example, the button switch of the scope of application for a patent !, wherein the concave-convex part is provided on one of the lower face of the tongue piece opposite the central fixed contact point and the central fixed contact point. The scope of the patent item (i) is the switch, wherein the rubber bullet O: \ 86 \ 86252.DOC 1228737 has a pressing part for pressing the tongue of the movable contact plate, and is on the tongue. Provide a convex part that can contact the pressing part. O: \ 86 \ 86252.DOC