Monitoring camera

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to the FIGURE, it may be seen that a monitoring camera generally denoted as 1 is mounted on a wall 3 of a submersible pressure vessel not illustrated herein.
The camera 1 is composed of a front portion 2 and a remaining rear portion 5.
A reference numeral 4 shows the interior of the pressure vessel.
The front portion 2 is releasably connected to the portion 5 by means of a bayonett joint 6.
The front portion 2 of the camera includes a central cylindrical element 7 formed with a central opening 19.
The element 7 is mounted in an opening 8 made in the wall 3 of the pressure vessel and extends somewhat into the interior 4 of the pressure vessel.
The cylindrical element 7 is provided with a flange 9 which abuts against the inner side of the wall 3.
The flange 9 has an outer thread by which it is threaded to a ring-shaped fastening element 10 which, respectively, has an inner thread.
The fastening element 10 urges a first supporting ring 11 against the front side of the flange 9.
A first lens 12 is supported in a circular recess 14 formed in the cylindrical element 7, which lens is a part of an optical system utilized in the monitoring camera 1.
The supporting ring 11 acts against the front end of the lens 12 thereby supporting the latter.
A second supporting ring 13 is inserted in the bottom of the recess 14 and serves to support the lens 12 at the other side thereof.
A stepped recess 15 is formed in the cylindrical element 7 which has the diameters relatively smaller than that of the recess 14.
A second lens 16 is positioned in the recess 15, which lens is partially engaged by the supporting ring 13.
The lenses are sealed in the element 7 by O-ring seal 17 which is located in the wall formed by the recess 15.
The seal 17 is pressed by the lens 16 against this wall.
The first lens 12 is sealed by a O-ring seal 18 positioned in the recess 14.
The central opening 19 extending through the element 7 serves to accommodate a number of additional lenses utilized in the optical system if necessary