Coriant Oy

Jari-Pekka Laihonen

Antti Holma

Petri Kohonen

Heikki Jekunen

An electrical device includes a circuit board (), a light source (), and a light guide (). The light guide receives light from the light source and conducts the received light to an end of the light guide so that the light crosses, in a direction parallel with the circuit board, an edge of the circuit board. The end of the light guide constitutes a display surface for showing the light to a user. On a fringe area extending from the edge of the circuit board a distance (D) towards the opposite edge of the circuit board, the light guide is between geometrical planes parallel and coinciding with surfaces of the circuit board. Hence, the light guide does not require room in directions perpendicular to the circuit board. Therefore, for example, more connectors, key buttons, and/or other instruments can be placed on a control panel of the electrical device.

Electrical device

A circuit board system according to the invention comprises a circuit board (), at least one element () mechanically supported with respect to the circuit board, and a spring-fastener () arranged to mechanically support the at least one element with respect to the circuit board. The spring-fastener comprises a pressing portion () pressing the at least one element and a latching portion () extending from an end of the pressing portion and being shape-locked in one or more apertures (-) of the circuit board. The latching portion and the one or more apertures of the circuit board are shaped to provide shape-locking whose opening requires at least a first movement of the latching portion in a first direction against the spring-force of the spring fastener and, subsequently, a second movement of the latching portion in a second direction against the spring-force of the spring fastener.

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Espoo, Finland

Jari-Pekka Laihonen