DE19737908A1 - Electric key switch with text field - Google Patents

Abstract

The push-button switch (10) has an operating wiper (3) provided with a character field (11) with a transparent cover (1), which is illuminated from the rear by a light source, e.g. an LED, cooperating with a light conductor prism (2) inserted in a reception shaft (21) in the operating wiper, with its light output surface (6) facing the transparent cover.

Description

The invention relates to an electrical key switch with an actuator rocker that has a title block. The push button switch can be part of a push button order with several such buttons.

Button arrangements with inscribable, strip-shaped control surfaces are in front preferably so. B. mounted on a wall, that the characters are horizontal fen, the actuating rocker pivots about a vertical axis. It's an arrangement nations known, in which a frame that surrounds several buttons, a title block bears, or where the pushbuttons cover the entire surface or partial areas of text fields to have. Such button arrangements are particularly electronic for operation installation equipment. Button arrangements with inscribable rockers are known for example from G 93 05 822 and G 94 06 434.

It is a disadvantage of the known buttons that a label is only available ambient light is legible because there is no self-illumination.

The invention has for its object to suit an electric key switch ben, the operating rocker is provided with an illuminated lettering field and with a largely uniform backlighting of the text field.

This object is achieved by a push button switch with the specified in claim 1 Features resolved.  

This button is achieved by means of a fiber optic wedge, that despite almost punctiform light introduction through a light-emitting diode LED There is uniform backlighting of the entire text field.

A status display is also proposed as an advantageous embodiment to create by means of a further light-emitting diode LED, the light of which means a light guide element is guided to the rocker surface, and also one Separator to be provided on the underside of the rocker, with which a mutual leg flow of lighting equipment is avoided.

Further details and advantages of the button result from the following Description of an embodiment with reference to the drawing figures.

Show it:

Fig. 1 shows a button arrangement with three buttons, each having an illuminated text field and

Fig. 2 shows a section through a button with lighting devices for lettering field lighting and for status display.

Fig. 1 shows a switch arrangement 26 with three electrical pushbutton switches 10 with their respective rockers 3 are visible from the buttons 10 substantially. The rockers 3 are held in a rest position in a base 8 by locking means 24 , 25 and spring means 13 . In the exemplary embodiment, the base 8 is a common base for all buttons 10 of the arrangement 26 . Each button 10 has a writing field 11 and a status display 19th Reference numeral 27 denotes an infrared light-permeable front cover of the base 8 , which, however, is not of importance in connection with the invention. Through the cover 27 protrudes an operating button 20 of a pressure sequence switch or button with which the lighting means Be, so the LEDs 4 can be switched.

The title blocks 11 are each formed by an incision or shaft 21 of the rockers 3 , which can be covered by a transparent cover 1 . The strip-shaped covers 1 are each provided with latching elements 17 , 18 at their ends. A light guide wedge 2 can be inserted in each of the incisions 21 .

In Fig. 1 different assembly steps for completing the lighting device are shown. In the middle of the three buttons 10 , a light guide wedge 2 is inserted. The cover 1 is in the middle button 10 with its first Rastele element 17 hooked into the rocker 3 . In addition, a transparent insert 12 , z. B. is shown a translucent film, which is arranged under the cover 1 . The cover 1 is closed by folding it down in the direction indicated by the arrow, where it engages in the rocker 3 at its second end by means of the second locking element 18 . The covers 1 can be designed as a magnifying glass to improve the readability of a font located on the insert 12 .

With reference numerals 22 , 23 reflective coatings of the light guide wedge 2 are designated, which can be brought up with the recess of the light entry and exit surfaces 14 , 16 . The brightness at the light exit surface 16 can be increased by such a measure.

Fig. 2 shows a section through the key switch 10 at a point where the label 11 of the rocker 3 is located.

The base 8 and the rocker 3 are plastic parts. The rocker 3 is hooked into the base with the aid of latching means 24 , 25 and is held in the rest position by spring force, which is generated in two contact elements 13 , in particular microswitches. In the base 8 , a printed circuit board 9 is arranged on which the contact elements 13 and the first LED 4 for illuminating the lettering field and a second LED 5 for status display, that is to say for indicating a switching state, are arranged. The contact elements 13 are actuated via actuating cams 30 on the rocker 3 .

The first LED 4 feeds light into the light entry surface 14 of the light guide wedge 2 , which exits at the exit surface 16 and backlights the transparent insert 12 . The second LED 5 feeds light into a light guide element 6 , which emerges on the surface of the rocker 3 as a status display 19 . A separator 7 on the underside of the rocker 3 prevents the passage of light from the lettering illumination to the status display. It can be seen that the light guides 2 , 6 are spaced somewhat apart from the LEDs 4 , 5 , whereby a rocker movement is made possible.

With pin 28 and a multiple plug 29 , the key switch 10 , or the Ta steranordnung 26 ( Fig. 1) can be plugged onto a flush-mounted device, not shown.

Reference list

1

transparent cover

2nd

Fiber optic wedge

3rd

Rocker switch

4th

first light-emitting diode LED

5

second LED

6

Light guiding element

7

Divider or partition

8th

base

9

Circuit board

10th

Push button

11

Title block

12th

writable transparent insert

13

Microswitch

14

Light entry surface

15

thick wedge end

16

Light exit surface

17th

first locking element of the cover

18th

second locking element of the cover

19th

Status display

20th

Actuation button of a microswitch or push button

21

Optical fiber shaft or incision in the seesaw

22

first coating

23

second coating

24th

Locking hook or locking means of the rocker

25th

Latching means on the base

26

Push button arrangement

27

Infrared transparent cover

28

Cones

29

Multiple plug

30th

Actuating cams

Claims (9)

1. Electric key switch

• a) with an operating rocker ( 3 ) which has a writing field ( 11 ) which is provided with a transparent cover ( 1 ),
• b) with an illumination device for illuminating the writing field ( 11 ), in which a light guide wedge ( 2 ) is inserted into an incision or shaft ( 21 ) of the rocker ( 3 ), in the light entry surface ( 14 ) of the region of its thick wedge end ( 15 ) Light can be fed by means of a light source ( 4 ), and its light exit surface ( 16 ) faces the cover ( 1 ) and is adapted to its dimensions, and
• c) a labeled or inscribable transparent insert ( 12 ) can be inserted between the cover ( 1 ) and the light guide wedge ( 2 ).

2. Key switch according to claim 1, characterized in that the light source ( 4 ) is a light-emitting diode LED. 3. Key switch according to one of the preceding claims, characterized in that the insert ( 12 ) is a translucent film. 4. Key switch according to one of the preceding claims, characterized in that the cover ( 1 ) has latching elements ( 17 , 18 ), with the aid of which it can be hooked into the rocker ( 3 ) and latched when closing. 5. Key switch according to one of the preceding claims, characterized in that the surface of the light guide wedge ( 2 ), with the exception of its light entry and exit surfaces ( 14 , 16 ) with light-reflecting coatings ( 22 , 23 ) is hen. 6. Push button switch according to one of the preceding claims, characterized in that a base ( 8 ) is present, on which a circuit board ( 9 ) is arranged, on which the light source ( 4 ) is arranged, and in which the rocker ( 3 ) is held in a rest position by means of locking and spring means ( 13 , 24 , 25 ). 7. Key switch according to one of the preceding claims, characterized in that there is also a status display ( 19 ) which is formed by a second light source ( 5 ), preferably an LED, with which light can be fed into a light guide element ( 6 ), with which the light is guided into the area of the surface of the rocker ( 3 ) and is visible there as a status display ( 19 ). 8. Key switch according to claim 7, characterized in that a largely opaque separating web ( 7 ) is formed on the Wip pe ( 3 ) towards the button interior, which causes the control panel lighting and the Statusbe lighting do not affect each other. 9. Push button switch according to one of the preceding claims, characterized in that it is part of a push button arrangement ( 26 ) with a plurality of push button switches ( 10 ).