JPH0628743Y2 - Switch device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a keyboard-like switch device called a membrane switch.

(Prior Art) FIG. 3 shows a conventional switch device of this type.

Fixed contacts 32 are provided on the base 31. A printed board 34 is provided on the base 31 with a spacer 33 interposed therebetween, and a movable contact 35 that comes into contact with the fixed contact 32 is provided on the printed board 34. A surface sheet 37 is formed on the printed circuit board 34 with a spacer 36 interposed therebetween.
Is provided. The surface sheet 37 is provided with a dome-shaped emboss 37a corresponding to the movable contact 35.

In addition, these substrate 31, spacer 33, and printed circuit board 3
4, the spacer 36, and the topsheet 37 are each made of, for example, a polyester film.

In such a configuration, the emboss 3 of the topsheet 37
When the pressing operation of 7a is performed, as shown in FIG. 4, the embossment 37a is reversed to press the printed circuit board 34, and the movable contact 35 is brought into contact with the fixed contact 32. When the operation force on the emboss 37a is released, the emboss 37a and the printed circuit board 34 return to the state shown in FIG.
Is separated from the fixed contact 32.

(Problems to be Solved by the Invention) By the way, in the above conventional switch device, the topsheet 37 having the embossments 37a is transparent, and the embossments 37a and 37 of the topsheet 37 are transparent.
Symbols such as numbers are printed on the back surface other than a according to the design of the keyboard. Therefore, this emboss 37
Each time a is operated as shown in FIG. 4, the printed portion 37b on the back surface of the emboss 37a comes into contact with the printed board 34, so that the printed portion 37b is peeled off within a short period of time.

Therefore, as shown in FIG. 5, it is considered that a film 38 is adhered to the back surface portion of the top sheet 37 to protect the printing portion 37b.

However, in this case, the surface sheet 3 is formed by the film 38.
7 and emboss 37a become thicker, so emboss 37
The operation force when pressing a is increased, the click feeling when the emboss 37a is inverted is less likely to occur, and the operation feeling is reduced.

This invention solves the problem of the above-mentioned conventional switch device, and an object of the present invention is to provide a switch device which has a good operation feeling and can prevent deterioration of printing. It is what

[Structure of the Invention] (Means for Solving the Problems) In order to solve the above problems, the present invention holds a fixed contact provided on a base, a movable contact in contact with the fixed contact, and the movable contact. A sheet member, a transparent and reversible dome-shaped operation unit for driving the sheet member to bring a movable contact into contact with the fixed contact, a transparent sheet provided on the surface of the sheet member, and the transparent sheet And a display section provided by printing on the back surface of the operation section at a corresponding position.

(Operation) That is, in this invention, the display unit is not printed directly on the back surface of the operation unit, but the display unit is printed on the back surface of a transparent sheet different from the operation unit. Therefore, since a film for protecting printing is not provided on the operation unit, a good click feeling can be obtained when the operation unit is operated.

Moreover, since the printed display portion is covered with the transparent sheet, the print is not rubbed according to the operation of the operation portion, and the print deterioration can be prevented.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

The switch section 10 shown in FIG. 1 shows a part of the keyboard switch 1 shown in FIG. 2, and the keyboard switch 1 is configured by arranging a plurality of the switch sections 10.

In the switch section 10 shown in FIG. 1, a fixed contact 12 is formed by printing on a base 11. A printed circuit board 14 is provided on the base 11 with a spacer 13 interposed therebetween, and a movable contact 15 that contacts the fixed contact 12 is printed on the printed circuit board 14. A surface sheet 18 is provided on the printed board 14 with a transparent sheet 16 and a spacer 17 interposed therebetween. This surface sheet 18
A dome-shaped embossment 1 corresponding to the movable contact 15
8a is provided, and when the embossing 18a is pressed and inverted, the transparent sheet 16 and the printed circuit board 14 are pressed down, and the movable contact 15 comes into contact with the fixed contact 12.

When the operating force on the embossing 18a is released, the embossing 18a, the transparent sheet 16 and the printed circuit board 14 are released.
Returns to the state shown in FIG. 1, and the movable contact 15 separates from the fixed contact 12.

The substrate 11, the spacer 13, the printed board 14, the transparent sheet 16, the spacer 17, and the surface sheet 18 are each made of, for example, a polyester film.

Further, the top sheet 18 is entirely transparent, and a desired color is printed on the back surface of the top sheet 18 except the rectangles 18b including the embosses 18a, as shown in FIG.

Further, on the back surface of the transparent sheet 16, the embossing 18a is formed.
A printing unit 14a is provided in a range corresponding to, and symbols such as numbers and a background color are printed on the printing unit 14a according to the design of the keyboard switch. This printing unit 14
The surface having a is bonded to the printed circuit board 14. A symbol or the like printed on the back surface of the transparent sheet 16 is visible through the embossing 18a of the top sheet 18.

According to the above configuration, since the back surface of the embossing 18a of the topsheet 18 is not directly printed, it is not necessary to provide a sheet for protecting the printing on the back surface of the topsheet 18 as in the conventional case. Therefore, a good click feeling can be obtained without impairing the click feeling of the embossing 18a.

Further, a symbol or the like is printed on the back surface of the transparent sheet 16 interposed between the printed board 14 and the spacer 17, and the surface having the printed portion 14 a is bonded to the printed board 14. Therefore, even when the embossing 18a is operated, the printing portion 14a of the transparent sheet 16 is not rubbed, the printing is not peeled off, and the deterioration of the printing can be prevented.

In the above embodiment, the case where the invention is applied to the keyboard switch has been described, but the invention is not limited to this, and the invention can be applied to a single switch.

Of course, various modifications can be made without departing from the spirit of the invention.

[Advantages of the Invention] As described above in detail, according to this invention, the display unit is not directly printed on the back surface of the operation unit, but the display unit is printed on the back surface of the transparent sheet different from the operation unit. Therefore, since a film for protecting printing is not provided on the operation unit, a good click feeling can be obtained when the operation unit is operated. Further, since the printed display portion is covered with the transparent sheet, the print is not rubbed in accordance with the operation of the operation portion, and the deterioration of the print can be prevented. Moreover, since the increase in the number of parts is suppressed, it is possible to provide the switch device capable of preventing the increase in the number of assembling steps.

[Brief description of drawings]

FIG. 1 is a side sectional view showing an embodiment of the present invention, FIG. 2 is a plan view showing a keyboard switch using the switch portion shown in FIG. 1, and FIG. 3 is a side sectional view showing a conventional switch device. 4 is a side sectional view showing a different operation state of FIG.
FIG. 5 is a side sectional view showing a conventional switch device different from FIG. 11 ... Base, 13 ... Spacer, 14 ... Printed circuit board, 16 ... Transparent sheet, 17 ... Spacer, 18 ...
Top sheet, 18a ... Embossing, 14a ... Printing section.

Claims (1)

[Scope of utility model registration request] 1. A fixed contact provided on a base body, a movable contact that contacts the fixed contact, a sheet member that holds the movable contact, and a driving member that drives the movable contact to contact the fixed contact. A transparent and reversible dome-shaped operation section, a transparent sheet provided on the front surface of the sheet member, and a display section provided by printing at a position corresponding to the operation section on the back surface of the transparent sheet. A switch device comprising: