The present invention relates to a lamp to be used for surgical operations or for investigations of patients in hospitals. More particularly the lamp is of the kind com¬ prising a lamp housing supporting at least three reflec¬ tors associated each with at least one bulb or similar lamp and being angularly adjustable to focus the light beams to a predetermined area along the central optical axis of the lamp housing, the reflectors being spaced equally around the optical axis.

10

In known lamp housings of this kind the reflectors are carried by individually adjustable holders to adjust the angular position of each reflector. To adjust the posi¬ tions of the light beams each reflector must be adjusted 15 individually which is time consuming, and further each holder comprises an extra design detail which increases the manufacturing costs.

The object of the invention is to enable a simultaneous 20 angular adjustment of all holders by means of a single adjustment device.

This object is attained with a lamp which according to the invention has the characterizing features set forth in the 25 appended main claim.

_ Basically, all reflectors are mounted in openings in a

# flexible diaphragm member which at its periphery is rest-

5. ing against a shoulder or similar abutment on the inside

30 of the lamp housing and is biassed against this shoulder by means of an axially displaceable control device secured to the center of the diaphragm member. By displacing the center of the diaphragm member axially relative to the

shoulder, the diaphragm member will be symmetrically bent so that those portions of the diaphragm member supporting the reflectors will simultaneously be set to the desired angular position.

A preferred embodiment of the lamp according to the inven¬ tion is shown by way of example in the accompanying drawings.

Fig. 1 is a partial section through the lamp according to the invention along line 1-1 in Fig. 2, and

Fig. 2 is a plan view of the bottom end of the lamp.

The lamp has a lamp housing 10 carried by a holder 12.

On the inside of the lamp housing there is a circular shoulder 14 forming an abutment for the peripheral edge of a flexible diaphragm member 16 which may be of plastics. In the example shown the diaphragm member has a continuous circular edge cooperating with the circular shoulder, but the edge of the diaphragm member may be interrupted by recesses to provide ventilation openings.

To the center of the diaphragm member is secured a control device by means of a screw 17. The screw attaches a nut sleeve 18 to the diaphragm member. An adjustment screw 20 cooperates with the nut sleeve 18 and is secured to a rotatable control knob 22 provided at the upper end of the lamp housing 10.

If the knob 22 is rotated in a direction to move the center of the diaphragm member axially inwardly into the lamp housing, the diaphragm member will be symmetrically flexed to the position indicated by dotted lines.

Equally spaced around the center axis of the lamp housing or the center optical axis of the lamp are three openings in which are mounted reflectors 24,26,28, which are each associated with at least one bulb or other lamp to direct a light beam from each reflector. There may be provided more than three reflectors equally spaced around the opti¬ cal axis of the lamp housing.

In the lamp housing there are ventilations slots 30, and the diaphragm member has ventilation slots 32.

According to the invention a separate holder for each reflector is omitted because all reflectors are carried by the adjustable diaphragm member 16 having its periphery held stationary by means of the shoulder whereas its center is axially adjustable so that angular positions of the reflectors and thereby of the light beams may be adjusted simultaneously.