Abstract: A diving computer has a housing in which electronic components, at least one diving data display means and an electricity source are disposed water-tightly. Furthermore there are means, accessible from the outside, for connecting the energy source to the electronic elements. The diving data display means is preferably a liquid crystal display module with an integrated background illumination that can be switched on and off. For switching on and off this said illumination, an acceleration sensor and an electronic circuit are mounted in the diving computer. These last-mentioned parts have the effect that the illumination can be switched on or off by merely knocking on the diving computer or hitting the latter against another object. This is a procedure which can also be done underwater easily and safely, using just one hand, despite relatively thick diving gloves.

Abstract: A pressure regulator for divers' breathing apparatus having a diaphragm case and a diaphragm disposed therein. As a function of the pressure which exists in a space delimited by the diaphragm and which is varied by the diver's breathing, the diaphragm controls, via a control member, a valve having a fixed portion and a movable portion. A pressure chamber is provided in which a reduction in pressure is produced through a channel opening out into the flow of gaseous mixture into the valve at right angles to the direction of that flow. The opening of the valve is assisted and accelerated by this reduction in pressure in order to facilitate the diver's breathing.