FIELD OF THE INVENTION
The invention relates to a device having a single-sided printed circuit board.
BACKGROUND OF THE INVENTION
Single-sided printed circuit boards are known in the art, and have the advantage that they are cheaper than double-sided printed circuit boards. However, the obvious disadvantage of a single-sided printed circuit board is that connections are only possible at one side. While metallized vias or holes through the printed circuit board are known as well, such metallized holes also result in a price increase. For general background information on printed circuit boards (alternatively called printed wiring boards), reference is made to the Wikipedia article at http://en.wikipedia.org/wiki/Printed wiring board,
incorporated herein by reference.
SUMMARY OF THE INVENTION
It is, inter alia, an object of the invention to provide a relatively low-cost device having a single-sided printed circuit board that can still be contacted from the other side without using a metallized via. The invention is defined by the independent claims. Advantageous embodiments are defined in the dependent claims.
One aspect of the invention provides a device comprising a single-sided printed circuit board having a non-metallized hole, and a connection area close to the non-metallized hole on a metallized side of the single-sided printed circuit board; and a conducting bridge from the connection area and at least partially covering the non-metallized hole, for allowing the connection area to be contacted (e.g. by a probe) from a non-metallized side of the single-sided printed circuit board through the non-metallized hole.
The invention is advantageously applied in a remote control device, in which case the connection bridge can be formed by part of a key-mat having a carbon print area that forms the connection bridge. The probe can be used for testing purposes, or for allowing the IC to be programmed. In a similar way, it is possible to make a reset button at the bottom side of a single-sided printed circuit board if that reset button bridges two connection areas on the wired top side of the printed circuit board via respective connection bridges.
These and other aspects of the invention will be apparent from and elucidated with reference to the embodiments described hereinafter.
BRIEF DESCRIPTION OF THE DRAWINGS
Figs. 1A and 1B show exploded views of a remote control device in accordance with an embodiment of the invention; and
Figs. 2 and 3 show other views of a remote control device in accordance with an embodiment of the invention.
DESCRIPTION OF EMBODIMENTS
In the various figures, the reference signs have the following meanings:
- top casing of the remote control device
- button on the key-mat
- carbon print area on the bottom of the key-mat
- printed circuit board
- connection area on the printed circuit board
- bottom casing of the remote control device
- battery lid
The figures show various views of a remote control device in accordance with an embodiment of the invention. The embodiment is a rather simple remote control, with buttons B for channel up, channel down, volume up, volume down, and a standby button. Of course, the invention can alternatively be used with remote controls having more buttons. When a button is pressed down, a carbon print area CP on the lower side of the key-mat KM makes a connection on the printed circuit board PCB by bridging two contact areas (in this embodiment, these contact areas are represented by half circles; contact areas having other shapes are alternatively possible). The printed circuit board PCB has several other components customary for a remote control device, such as an integrated circuit and an infra-red light emitting diode.
In accordance with the present embodiment of the invention, there is also a carbon print area CP on the key-mat KM that is not below a button B, but that serves to make a connection between a probe P if and when inserted from the bottom side of the printed circuit board, through a hole in the bottom casing BC and a matching hole in the printed circuit board PCB, to a connection area CA on the top side of the single-sided printed circuit board PCB.
As shown in Figs. 2 and 3, the top casing TC of the remote control device in accordance with the embodiment of the invention is preferably formed such that the carbon print area above the hole in the printed circuit board PCB is firmly pressed onto the connection area, so that if and when the probe P is inserted through the hole and touches the carbon print, it gets a good connection with the connection are.
It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design many alternative embodiments without departing from the scope of the appended claims. In the shown embodiment, the connection area CA is a circle around the hole in the printed circuit board PCB. Alternatively, it may be a metalized area adjacent to just one side of the hole. The carbon print areas CP do not need to have a circle shape, and they do not need to cover the entire hole as long as they ensure that a connection is made between a probe P inserted through the hole and the connection area CA. The bottom side of the key-mat KM may alternatively have metallized contact areas instead of carbon print areas, as all what matters is that an electrical connection can be made so that a conducting bridge is formed. While the invention is illustrated by means of an embodiment formed by a remote control device, the invention can be used with any device having a single side printed circuit board that needs to be contacted from the other side. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps other than those listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements.
A device comprising:
a single-sided printed circuit board (PCB) having a non-metallized hole, and a connection area (CA) close to the non-metallized hole on a metallized side of the single-sided printed circuit board; and
a conducting bridge (CP) from the connection area (CA) and at least partially covering the non-metallized hole, for allowing the connection area (CA) to be contacted from a non-metallized side of the single-sided printed circuit board (PCB) through the non-metallized hole.
2. A device as claimed in claim 1, wherein the device is a remote control device further comprising a key-mat (KM) having a carbon print area (CP), and the conducting bridge is formed by said carbon print area (CP).