JPH0448592Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention is directed to a keyboard switch that is widely used as an operation input switch means for electrical/electronic equipment, etc., and in particular, a keyboard switch that provides tactile feedback to the fingertips etc. when operating the switch. The present invention relates to a keyboard switch having a dome that can be freely clicked.

``Prior Art'' Conventionally, this type of keyboard switch has a flexible switch sheet 1 with a dome 2 for switch operation formed at a desired location on the inner surface of the switch sheet 1, as shown in FIG. In addition to providing the contact pattern 3A, a flexible or hard base material 6 is placed on the switch sheet 1 via an insulating spacer 4 for forming a switch operation gap, and a base material 6 corresponding to the movable contact pattern is placed on the upper surface of the base material 6. It has a structure in which a required fixed contact pattern 9 is provided. In this keyboard switch, when the top of the dome 2 is pressed with a fingertip or the like, the dome 2 is reversed and the movable contact pattern 3A is replaced by the fixed contact pattern 9.
When a finger or the like is removed from the dome 2, the dome 2 returns to its original shape due to its flexibility, and at the same time, the contact between the contact patterns 3A and 9 is released. be done.

``Problems to be Solved by the Invention'' The keyboard switch having the above structure has a feature in that the switch operation can be confirmed as a tactile sensation, that is, a click sensation, due to the inversion and return movements of the dome 2. However, since the diameter of the hole 5A of the insulating spacer 4 approximately matches the diameter of the base of the dome 2, that is, the diameter of the boundary with the flat part of the switch sheet 1, the dome 2 cannot be turned over to the base. Well, dome 2
Contact pattern 3A, if you do not press the top of the
There is a possibility that contact between the two points cannot be reliably obtained. In other words, it is difficult to employ a so-called comb-shaped electrode contact pattern as the fixed contact pattern 9 because the contact range between both contact patterns 3A and 9 is restricted. Therefore, both contact patterns 3A, 9
As for the shape, as shown in FIG. 5, there is an inconvenience that it has to be formed into a circular shape or a ring shape having a lead portion.

``Means for Solving the Problems'' Therefore, the present invention is based on a contact pattern provided on the inner surface of a dome that can be freely clicked, and a dome switch sheet that has a press part for operating the switch that can be freely clicked. A base material is provided with another contact pattern at a position corresponding to the above contact pattern via an insulating spacer to form an operating gap, and the inversion/reversal operation performed by pressing the dome is provided.
In the panel keyboard in which the contact patterns are brought into contact and separated by the return movement, the diameter of the hole provided in the insulating spacer for the switch operation gap is configured to be larger than the diameter of the base of the dome. In addition, the contact pattern provided on the inner surface of the dome is configured such that its peripheral edge extends beyond the base of the dome.

"Operation" The diameter of the hole in the insulating spacer is made larger than the diameter of the dome for operating the switch, and the contact pattern provided on the inner surface of the dome is formed so that its peripheral edge extends beyond the base of the dome. As a result, when the dome is pressed, it is possible to widely deform the base part, which increases the number of contact points between the dome's contact pattern and the fixed contact pattern of the other party, while ensuring mutual contact between the contacts. You can make it happen.

Embodiment In FIGS. 1 to 3, the same reference numerals as those shown in FIG. 4 indicate the same components. First, switch sheet 1, dome 2, base material 6
are arranged in the same manner as in FIG. In the present invention, since the diameter B of the hole 5 of the insulating spacer 4 is set larger than the diameter A of the base of the dome 2,
The movable contact pattern 3 is attached so that its periphery extends beyond the base of the dome 2, and its planar shape is circular as shown in FIG. 2 and has no lead portion. On the other hand, the fixed contact pattern is connected to the second contact pattern so that when the dome 2 and therefore the movable contact pattern 3 are pressed, this brings them into the connected state.
It consists of switch patterns 7 and 8 arranged in a comb shape as illustrated in FIG. 2 or 3.

In a keyboard switch having such a structure, the hole 5 of the insulating spacer 4 is provided at a position recessed from the base of the dome 2, so when the top of the dome 2 is pressed to operate the switch, it will open as shown in Figure 3. ,
The dome 2 deforms to the base and is completely reversed, and the movable contact pattern 3 and the fixed contact patterns 7 and 8 simultaneously contact at many points, and the fixed contact patterns 7,
The connection between 8 is ensured. And dome 2
In this way, the dome 2 can be deformed widely up to the base, so when the switch is operated, the top part comes off and the dome 2
Even in the case where the side slopes of the movable contact pattern 3 are pressed, it is possible to bring the movable contact pattern 3 into contact with the fixed contact patterns 7 and 8, which is extremely convenient. Further, since the fixed contact patterns 7 and 8 can adopt a comb-shaped structure, the movable contact pattern 3 does not require a lead portion or the like, and therefore, the formation of the contact pattern can be facilitated.

"Effects of the Invention" According to the keyboard switch of the present invention, the diameter of the hole for the switch operation gap provided in the insulating spacer is made larger than the diameter of the base of the dome which is formed in the switch sheet and can be operated freely by clicking, and By configuring the contact pattern provided on the inner surface of the dome so that its periphery extends beyond the base of the dome, the inversion area of the dome and, therefore, the contact area of the contact pattern can be effectively expanded. So,
While increasing the number of contact points between the contact pattern of the dome and the fixed contact pattern of the other party, good contact between the contacts can be ensured to ensure switch operation and contact operation. As a result, it is possible to provide a keyboard switch that is easy to manufacture and has good switch operation and contact performance, and is free from failures.

[Brief explanation of the drawing]

Fig. 1 is a conceptual sectional view of the main parts of the keyboard switch according to the present invention, Fig. 2 1 is an exemplary plan view of its movable contact pattern, and Figs. 2 and 3 each show different configuration examples of the fixed contact pattern. A plan view showing,
FIG. 3 is a conceptual cross-sectional view showing the state of the keyboard switch when it is operated, FIG. 4 is a conceptual cross-sectional view of a conventional keyboard switch, and FIG.
FIG. 4 is a plan view showing different configuration examples of respective contact patterns in the figure. 1... Switch seat, 2... Dome, 3...
Movable contact pattern, 4... Insulating spacer, 5...
Gap hole, 6...Base material, 7, 8...Fixed contact pattern, A...Dome base diameter, B...Spacer hole diameter.

Claims (1)

[Scope of utility model registration request] A base material with a contact pattern provided on the inner surface of a dome that can be freely clicked and formed on a switch sheet, and another contact pattern provided at a position corresponding to the above contact pattern via an insulating spacer to form a switch operation gap. In the panel keyboard, the insulating spacer is provided from the diameter of the base of the dome in such a manner that the contact and separation between the two contact patterns are brought about by the reversal and return movements performed by the pressing operation of the dome, respectively. The diameter of the hole for the switch operation gap is configured to be large, and the contact pattern provided on the inner surface of the dome is configured such that its peripheral edge extends beyond the base of the dome. keyboard switch.