DE102006019945B3 - Touch head for a push button, especially a switch has transparent carrier film with visible display or symbol on the rear side by a color film and a base film with a rear coating - Google Patents

Abstract

A touch head for a push button, especially a switch, comprises a transparent carrier film (1) having an observable (2) display or symbol (3) on the rear side through a color layer on a base film (4). The base film is transparent and has a background coating (5) on its rear side. Preferably the background coating is reflective, translucent or trans-reflective and is formed by physical vapor deposition.

Description

The The invention relates to a key top for a push button in particular a pushbutton switch, with a transparent carrier foil, on whose one observer side opposite side by a color layer a sign or symbol is applied and facing away from her on the observer side Side is connected to a base part.

at Such a key top is known to be the character or Symbol bearing side of the carrier film to print a protective layer and after molding to a key top shape the carrier film To inject the base part with plastic behind.

This Key head is complex and has a large depth.

task The invention is a key top of the type mentioned to create, whose signs or symbols at low depth of the Keyboard both with a depth effect as well as floating from an observer can be detected.

These Task is inventively characterized solved, that the base part is formed transparent and on its the carrier film opposite side is provided with a background coating.

Thereby, that the characters or symbols are both spaced apart from the observer side of the key top as well as at a distance to that on the observer side facing away from the button head applied background coating are arranged, both a depth effect and a levitation communicating signs and symbols to an observer.

simultaneously the key head has a low overall height.

is the background coating is reflective to the observer side Coating, so is by the from the observer side as ambient light or Reflected light from a light source on the reflective coating Light the levitation effect even more intense.

Additionally the floating effect is intensified detectable if the background coating is one to the observer side Transflective coating is and a transmissive illumination of the key top.

The Background coating can also be an observer site be translucent coating.

Should the background can get a metallic appearance, the background coating can be a PVD coating (physical vapor deposition coating).

In In a simple way, it is also possible that the background coating a pressure coating, in particular a screen printing coating is.

Independent of The type of background coating can be the background coating be colored.

Around To achieve a particularly low depth of the probe is the transparent base preferably a base film in a simple Way on the carrier foil can be laminated.

To sufficient stability the key top with a small depth leads, if the carrier film and / or the base film has a thickness between 0.05 mm and 2 mm, in particular between 0.1 mm and 1.0 mm.

A good light transmission and transparency is achieved in that the carrier film and / or the base film is made of polycarbonate, so the characters and Symbols sharp contours can be detected by the observer.

The on the carrier film applied ink layer can easily a print layer, in particular be a screen printing layer.

to Negative representation can be the character or symbol by a corresponding Recess of the area the carrier film be covered covering color layer.

It but it is also possible the character or symbol is formed by the color layer and the environment of the sign and symbol is free of color shift by one To get positive representation of character or symbol.

to Prevention of damage the observer-side acted upon by an operator of the key top surface the button head can the transparent carrier film on the observer side a protective layer, in particular a surface hardening layer can be.

To stabilize and form a guide element of the key top, a frame may radially surround the base part and the carrier film at its base enclose the current edge.

Consists while the frame of a non-translucent material, so can light with the keyboard light no side emerge and to an undesirable Light ring around the key top.

To the frame is preferably made of a black material.

Easy It can be produced, if the frame is a to the circulating Edge of base part and carrier film molded injection molded part made of a plastic.

A especially good prevention of a light ring around the key top is achieved in that the frame on the side facing away from the observer Side bay over the plane of the base protrudes.

One embodiment The invention is illustrated in the drawing and will be described below described. The sole figure of the drawing shows a cross section a schematically illustrated key top.

The illustrated key top has a transparent carrier foil 1 from z. As polycarbonate on which an observer 2 opposite surface by screen printing a sign 3 is printed.

Subsequently, the observer was on 2 opposite surface of the carrier film 1 a base film 4 laminated, which can also consist of polycarbonate.

On the observer 2 remote surface of the base film 4 is a PVD coating 5 (Physical vapor deposition) applied, which is metallic and semi-transparent.

Observer side has the carrier film 1 a surface hardening layer 6 ,

The base film 4 and the carrier film 1 are at their radially encircling edge of a frame 7 enclosed, which consists of a black plastic and is a molded injection molded part.

This frame is on the side facing away from the observer side on the plane of the base film 4 bay-like.

The key head can z. B. be exposed to light only from the observer side by the ambient light, that of the PVD coating 5 is reflected and the sign 3 dark in a bright environment 9 the observer 2 appears.

Especially in the dark, lighting can be provided by a light source 8th from the observer side, their light in the same way on the PVD coating 5 is reflected and becomes a dark sign 3 in a bright environment 9 leads.

But it is also a transmissive illumination of the observer 2 turned away side by another light source 10 possible.

Again, the sign seems 3 dark in a bright environment 9 ,

1

support film

2

observer

3

character

4

base film

5

PVD

6

surface hardening

7

frame

8th

light source

9

environment

10

light source

Claims (21)

Key head for a pushbutton, in particular a key switch, with a transparent carrier film, on whose side facing away from an observer side by a color layer, a sign or symbol is applied and which is connected on its side remote from the observer side with a base part, characterized in that the base part is transparent and on its the carrier film ( 1 ) facing away from the side is provided with a background coating. Key head according to claim 1, characterized the background coating is reflective to the observer side Coating is. Key head according to claim 1, characterized the background coating is a transflective to the observer side Coating is. Key head according to claim 1, characterized the background coating is translucent to the observer side Coating is. Button head according to one of the preceding claims, characterized in that the background coating is a PVD coating (physical vapor deposition coating) ( 5 ). Key top according to one of claims 1 to 4, characterized in that the background coating is a pressure coating, in particular a screen-printing coating. Key head according to one of the preceding claims, characterized characterized in that the background coating is colored. Button head according to one of the preceding claims, characterized in that the transparent base part comprises a base film ( 4 ). Key head according to claim 8, characterized in that the base film ( 4 ) on the carrier film ( 1 ) is laminated. Key head according to one of the preceding claims, characterized characterized in that the carrier film and / or the base film has a thickness between 0.05 mm and 2 mm, in particular between 0.1 mm and 1.0 mm. Key head according to one of the preceding claims, characterized in that the carrier foil ( 1 ) and / or the base film ( 4 ) consists of polycarbonate. Key head according to one of the preceding claims, characterized in that the color layer applied to the carrier film a printing layer, in particular a screen printing layer. Key head according to one of the preceding claims, characterized characterized in that the character or symbol by an appropriate Recess of the area the carrier film covering color layer is formed. Key head according to one of claims 1 to 12, characterized in that the character ( 3 ) or symbol is formed by the color layer and the environment ( 9 ) of the sign ( 3 ) and Symbols is color coat free. Key head according to one of the preceding claims, characterized characterized in that the transparent carrier film on the observer side has a protective layer. A key top according to claim 15, characterized in that the protective layer comprises a surface hardening layer ( 6 ). Key head according to one of the preceding claims, characterized in that a frame ( 7 ) the base part and the carrier film ( 1 ) encloses at its radially encircling edge. Key head according to claim 17, characterized that the frame consists of a non-translucent material. Key top according to claim 18, characterized in that the frame ( 7 ) consists of a black material. Key top according to one of claims 17 to 19, characterized in that the frame ( 7 ) to the peripheral edge of the base part and carrier film ( 1 ) molded injection molded part made of a plastic. Key top according to one of claims 17 to 20, characterized in that the frame ( 7 ) protrudes on the side facing away from the observer side like a shaft over the plane of the base part.