JPS6137147Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a contact sheet for a push button switch printed with a conductive layer and an insulating spacer layer.

In push-button switches installed in small electronic calculators, etc., a contact sheet printed with a conductive layer having movable contacts and conductive parts that connect the movable contacts is used.The conductive parts are connected to the circuit pattern on the circuit board, and the push-button switches are There is a structure in which the movable contacts are brought into contact with the fixed contacts on the circuit board by pressing the contact sheet.

Furthermore, in the contact sheet of this push button switch, it is necessary to interpose a spacer between the contact sheet and the circuit board in order to separate the movable contact and the fixed contact when the switch is not operating. An insulating spacer layer is formed by printing a thick film of insulating paint on the side surface facing the circuit board, except for the holes, which are non-printed parts surrounding the movable contacts. In this case, especially when soft paint is used, when the contact sheet is pressed, the insulating spacer layer is compressed and tightly adheres to the circuit board, creating a negative pressure sealed space where the hole is isolated from the outside, and the suction cup This action may fix the contact sheet on the base, making it difficult for the movable contacts to return. Therefore, by forming a communication groove, which is a non-printed part, in the insulating spacer from the hole to the outer peripheral edge of the contact sheet to communicate the hole with the outside, the suction effect of the hole is prevented.

However, when multiple movable contacts are arranged and printed in the vertical and horizontal directions on the conductive layer of a contact sheet, such as when installing multiple push button switches in a small electronic calculator, multiple conductive parts are printed. It is printed vertically and horizontally to connect movable contacts. However, in this case, if a plurality of communication grooves are formed in the insulating spacer layer so as to commonly connect the plurality of holes arranged in the vertical and horizontal directions corresponding to the movable contacts, the movable contacts can be formed on the contact sheet. It may intersect vertically and horizontally with conductive parts printed vertically and horizontally to connect them. In that case, the conductive portion, which is the printed portion of the conductive layer, is exposed through the communication groove, which is the non-printed portion of the insulating spacer layer, and may come into contact with the circuit pattern of the circuit board and cause an accident.

The present invention has been made in view of the above circumstances, and provides a contact sheet for a push button switch in which a communicating groove is formed in an insulating spacer layer so as not to intersect with a conductive part of a conductive layer so that a conductive part is not exposed.

Embodiments of the present invention will be described below with reference to drawings.

1 and 2 show an embodiment of the present invention, and FIG. 1 shows an embodiment of the contact sheet.
FIG. 2 shows a push button switch using a contact sheet. In the figure, reference numeral 1 denotes a contact sheet made of an insulating resin film, and a conductive layer is printed on the side surface of the sheet 1 facing the circuit board 13 using conductive paint. In this conductive layer, as shown in FIG. It is printed. In FIG. 1, the movable contacts 2 are regularly arranged in a lattice shape with equal intervals in the vertical and horizontal directions. In addition, a plurality of movable contacts 2 are provided along the vertical and horizontal directions as a conductive layer.
A plurality of line-shaped conductive parts 3 that commonly connect...
...is printed. The conductive portion 3... is for commonly connecting a plurality of predetermined movable contacts 2... along the vertical and horizontal directions according to the wiring configuration, and the movable contacts 2...
...The whole is divided into multiple sets of connection blocks.
In addition, a plurality of tongue pieces 1a are formed on the sheet 1 at the peripheral portions and central portions located near each connection block of the movable contacts 2, and these tongue pieces 1a...
Terminals 4 . . . connected to the conductive portions 3 . Further, on the side surface of the sheet 1 facing the circuit board 13, an insulating spacer layer 5 made of an insulating paint is printed with a thickness greater than that of the conductive layer 2 by a thick film method. As shown in FIG. 1b, this insulating spacer layer 5 includes each movable contact 2 of the conductive layer and a plurality of holes 6 surrounding it.
. . . and a plurality of communication grooves 7 . . . that commonly connect the holes 6 . That is, as shown in FIG. 1c, the insulating spacer layer 5 covers the side surface of the sheet 1 and each conductive portion 3 of the conductive layer, and the hole portions 6, which are hole-shaped non-printed portions, are formed on the conductive layer. The movable contacts 2 are formed to be arranged in the vertical and horizontal directions in correspondence with each other. The conductive groove 7, which is a groove-shaped non-printed part, forms a straight line obliquely to the vertical and horizontal directions in which the conductive part 3 of the conductive layer is printed, and connects each hole 6 in common. In the drawing, a plurality of communication grooves 7... inclined in a certain direction are arranged in parallel on the entire side surface of the sheet 1, and each communication groove 7... is formed by one or more communication grooves 7 located on the line. A plurality of holes 6... are connected. Note that one end of each of the communication grooves 7 extends to the outer peripheral edge of the sheet 1, and communicates the holes 6 with the outside of the sheet 1. In the drawing, the holes 6, 6 are located on one diagonal line of a quadrilateral surrounded by four holes 6 arranged in the vertical and horizontal directions and are opposed to each other.
A communication groove 7... is formed so as to connect the holes 6...
... are equally spaced in the vertical and horizontal directions in correspondence with the movable contacts 2, and are therefore inclined at an angle of 45° with respect to the vertical and horizontal directions of the communication grooves 7. In this way, the communication groove 7 of the insulating spacer layer 5 connects the hole 6 (in other words, the movable contact 2) along the direction diagonal to the vertical and horizontal directions. It does not intersect with the conductive portion 3 of the conductive layer that connects the movable contact 2 along the line (in other words, the hole 6). Note that the insulating spacer layer 5 is not printed on the tongue piece 1a of the sheet 1 and the terminal 4 portion of the conductive layer, leaving a non-printed portion 5a. FIG. 1c shows a state in which a conductive layer and an insulating spacer layer 5 are stacked on a sheet 1, and movable contacts 2 of the conductive layer are formed in holes 6 which are non-printed parts of the insulating spacer layer 5. The conductive portion 3 is exposed at... and covered by the printed portion of the insulating spacer layer 5, and the insulating spacer layer 5 is formed along the diagonal direction because it is formed along the vertical and horizontal directions. It does not intersect vertically with the groove 7 and is not exposed in the communication groove 7.

In FIG. 2, 8 is a case of a small electronic calculator, 9 is a push button inserted into a button hole 10 formed in the case 8, 11 is a rubber sheet superimposed on the underside of the case 8, and 12 is a rubber sheet. A push button 9 is formed upward in the seat 11 and is located within the button hole 10 of the case 8.
13 is a circuit board, and 14... are a plurality of fixed contacts arranged vertically and horizontally on the upper surface of the circuit board 13. The contact sheet of the present invention is arranged by overlapping the sheet 1 on the lower surface of the rubber sheet 11 and overlapping the insulating spacer layer 5 on the circuit board 13 between the two. Movable contact 2 of the conductive layer of the contact sheet
. . . are opposed to the fixed contacts 14 of the circuit board 13 through holes 6 . 4 is the circuit board 13
It is connected to the terminal 15 formed above. The communication grooves 7 of the insulating spacer layer 5 are closed by the circuit board 13, and the holes 6 communicate with the outside of the contact sheet.
Further, the conductive portion 3 of the conductive layer is an insulating spacer layer 5.
Since the communication grooves 7 are covered by the communication grooves 7, they are not exposed on the circuit board 13, and a shot accident due to contact with a circuit pattern formed on the circuit board 13 can be prevented. In the push button switch configured in this way, when not in operation, the movable contacts 2 of the contact sheet are separated from the fixed contacts 14 of the circuit board 13,
When the push button 9 is pressed to push down the bulge 12 of the rubber sheet 11, the bulge 12 presses the sheet 1, so that the movable contacts 2 come into contact with the fixed contacts 14.

Therefore, forming the communication grooves 7 in an oblique direction in the insulating spacer layer 5 of the contact sheet as shown in this embodiment is advantageous in manufacturing the contact sheet. As shown in FIG. 3, the contact sheet is made by printing a conductive layer and an insulating spacer layer 5 on each sheet 1 on a sheet material 16 of a size that allows for a plurality of sheets 1...
Manufacture by cutting... In this manufacturing process, the conductive spacer layer 5 is printed by placing paint on a mask and moving a squeegee (brush), for example, along the longitudinal direction of the sheet material 16. Since it is oblique to the moving direction of the squeegee in accordance with ..., the sheet material 16 can be removed without the paint getting caught in the holes of the mask.
Printed on top. The same applies when moving the squeegee along the width direction of the sheet material 16. However, if the communication grooves 7 are along the vertical or horizontal direction and are perpendicular to the direction of movement of the squeegee, the paint will get caught in the through holes of the mask, making it impossible to print well. The inclination angle of the communication grooves 7 should be in the range of 15° to 75° in order to allow the paint to pass through the through holes of the mask without getting caught when printing the insulating spacer layer 5. is preferred.

FIG. 4 shows another embodiment of the contact sheet, in which the movable contacts and conductive portions of the conductive layer are formed together in a planar shape. FIG. 4a shows the conductive layer printed on the sheet 1, and the positions of the movable contacts and the connections of the conductive parts are basically the same as in the previous embodiment, but the movable contacts and A connection block 17 in which the conductive parts are integrated into a planar shape is printed. Incidentally, each connection block 17 is formed with a line-shaped non-printed portion 18 at a location corresponding to each communication groove 21 of the insulating spacer layer 19, and overlaps with each communication groove 21. FIG. 4b shows an insulating spacer layer 19 printed on sheet 1.
This insulating spacer layer 19 has holes corresponding to each movable contact portion of each connection block 17 of the conductive layer (that is, the same as the hole 6 of the insulating spacer layer 5 in the first embodiment). position) multiple holes 20
... are arranged vertically and horizontally,
Also, a plurality of communication grooves 21 connecting each hole 20...
is formed. Depending on the shape of each connecting block 17, this communication groove 21... is inclined in one direction at an angle of 45 degrees, or inclined in the other direction at an angle of 45 degrees, or even inclined in both directions. It is formed like this. FIG. 4c shows a sheet 1 printed with conductive layer connecting blocks 17 . . . and an insulating spacer layer 19 superimposed. Insulating spacer layer 19
covers the connecting block 17..., and the hole 20... covers each movable contact portion 17a... of the connecting block 17...
. . are exposed, and the communication grooves 21 . . . overlap with each non-printed portion 18 . . . of the connection blocks 17 . That is, the non-printed portions 18 of the connection blocks 17 are provided to escape from the communication portions 21 so that the conductive portions are not exposed.

FIG. 5 shows another embodiment of a push-button switch using a contact sheet, and the same parts as in FIG. 2 are given the same reference numerals and the explanation thereof will be omitted. In this push button switch, the rubber sheet 11 having the bulging portion 12 is not provided, but bosses 22 made of synthetic resin for supporting the push buttons 9 are provided on the upper surface of the sheet 1 in the contact sheet in correspondence with the movable contacts 2 . By pressing the push button 9, the sheet 1 is pressed through the bosses 22, and the movable contacts 2... are connected to the fixed contacts 1.
4. Bring it into contact with...

Note that it is sufficient that the movable contacts of the conductive layer printed on the contact sheet are arranged in the vertical and horizontal directions, and the arrangement is not limited to a grid pattern. The conductive portion of the conductive layer may be one that connects the movable contacts along the vertical and horizontal directions, and may be either linear or planar. The communication groove, which is the non-printed part of the insulating spacer layer printed on the contact sheet, connects the movable contacts of the conductive layer and has a predetermined inclination in the vertical and horizontal directions so as not to intersect with the printed conductive part in the vertical and horizontal directions. The holes are formed diagonally at an angle to connect the holes of the insulating spacer layer. For example, in the embodiment shown in FIG. 1, the movable contacts may be formed on one or both diagonals of the quadrilateral, or may be arranged so that they intersect rather than being aligned in one direction. Furthermore, it may be bent, as in the embodiment shown in FIG. 2, for example. The configuration of the push button switch is not limited to the embodiment.

As explained above, the contact sheet of the push button switch of the present invention has a conductive layer consisting of a movable contact and a conductive part, a hole-shaped non-printed part surrounding the movable contact, and a groove-shaped non-printed part connecting this non-printed part. The groove-shaped non-printed part of the insulating spacer layer is formed along the diagonal direction with respect to the conductive part of the conductive layer, so that the conductive part of the conductive layer Since it does not cross the non-printed area and is not exposed from the non-printed area, it is possible to prevent shoot accidents due to contact with the circuit pattern on the circuit board.

[Brief explanation of drawings]

Fig. 1 shows an embodiment of the contact sheet of the present invention, in which a is a plan view showing a conductive layer, b is a plan view showing an insulating spacer layer, c is a plan view showing a state in which both layers are combined, and Fig. 1 is a plan view showing a conductive layer. Fig. 2 is a vertical cross-sectional side view showing one embodiment of a push button switch using the contact sheet of the present invention, Fig. 3 is an explanatory view showing the sheet material used for manufacturing the contact sheet, and Fig. 4 is an illustration of another example of the contact sheet of the present invention. Embodiments are shown in which a is a plan view showing a conductive layer, b is a plan view showing an insulating spacer layer, c is a plan view showing a state in which both layers are combined, and FIG. 5 is another example of a push button switch. FIG. DESCRIPTION OF SYMBOLS 1...Sheet, 2...Movable contact, 3...Conducting part, 4...Terminal, 5...Insulating spacer layer, 6...
Hole (non-printing part), 7...Communication groove (non-printing part), 8
...Case, 9...Push button, 11...Rubber sheet,
12...Bulging part, 13...Circuit board, 14...Fixed contact, 17...Connection block, 18...Non-printed part, 19...Insulating spacer layer, 20...Hole, 2
1...Communication groove.

Claims (1)

[Scope of utility model registration request] an insulating sheet provided on a circuit board, a plurality of movable contacts printed on the side surface of the sheet facing the circuit board and arranged vertically and horizontally corresponding to the fixed contacts of the circuit board; and a conductive layer having a conductive portion that connects each of the movable contacts along the lateral direction, and a conductive layer that covers the side surface of the sheet including the conductive portion while leaving a hole-shaped non-printed portion surrounding the movable contact and its periphery. The insulating spacer layer has a groove-shaped non-printed portion that intersects with each of the hole-shaped non-printed portions along a direction diagonal to the vertical and horizontal directions. Contact sheet for push button switches.