Abstract:
The aim of the invention is to provide prior art equipment, especially for firemen, in the form of helmets ( 2 ) and/or breathing masks ( 3 ) with a display unit for infrared images. A mask ( 6 ) for displaying images on a display ( 20 ) is provided, whereby the images are recorded by a camera ( 13 ). The inventive mask comprises a frame ( 18 ) having a seal ( 17 ) that, when the mask ( 6 ) is used, rests on an assigned bearing surface ( 5 ), e.g. the visor ( 5 ) of a breathing mask ( 3 ), in such a way that a sealed chamber ( 19 ) is formed between the mask ( 6 ) and the bearing surface ( 5 ).

Description:
BACKGROUND OF THE INVENTION 
   The invention relates to a device for screen display of pictures recorded with a camera. 
   DESCRIPTION OF THE RELATED ART 
   Firemen must often look for individuals under very difficult conditions, such as darkness or serious vision impairment by smoke, in part with heavy equipment, and must work in advance to the source of the fire; this entails very great dangers. Limited by the heavy respiratory equipment in freedom of movement and vision and due to heavy smoke development or darkness, it is often not possible for the fireman to recognize danger sites and barriers in time. The fireman is therefore reliant solely on his sense of touch. 
   To solve this problem, in the past several systems were offered which work with infrared cameras by which the fireman is not reliant on visible light for detecting the environment. Especially the infrared radiation from individuals and sources of the fire can be easily recorded with an infrared camera and displayed. 
   U.S. Pat. No. 5,949,582 discloses a face mask which can be attached to a helmet and into which an infrared camera, a screen for display of the images recorded with the infrared camera, and a respiratory means are integrated. This face mask is feasible as a compact system which leaves the hands of the fireman free. A major defect of this face mask is however that it is not suited for retrofitting onto existing systems consisting of helmets and breathing masks with a display unit. The face mask known from U.S. Pat. No. 5,949,582 is furthermore disadvantageous in that the respirator cannot be used alone, i.e. without the display unit; this makes the procurement costs higher in that in addition to the face mask, also respiratory means without the display unit must be kept available. 
   SUMMARY OF THE INVENTION 
   Therefore the object of the invention to further develop a device of the initially described type such that existing equipment in the form of helmets and/or breathing masks can be equipped with a display unit. 
   This object is achieved by the inventive idea that the simplest and most economical approach for retrofitting existing equipment is to place the screen on which the image recorded by a camera, for example an infrared camera or a CCD camera, can be seen, on a device which is mounted simply on the existing equipment. To prevent limitation or hindrance of the view of the screen due to smoke, soot or other fouling, it is furthermore provided as claimed in the invention that the device is sealed relative to the contact surface so that the penetration of smoke or dirt is reliably prevented. In a host of existing breathing masks or helmets there is a lens or visor anyway which is especially suitable as the sealing surface for the device. 
   To be able to adapt the device as claimed in the invention to as many existing breathing masks as possible, it can be provided within the framework of the invention that the seal is mounted interchangeably on the frame. In this way it is easily possible to adapt a uniform device to many breathing masks or helmets with different curvatures of the lens, in which a suitably shaped seal is attached to the device in order to provide for reliable sealing. 
   In one preferred embodiment of the invention it can be provided that the device is connected via a connection to a mounting means for attachment to a helmet and especially that the connection is movable or the connection is spring-elastic. 
   These embodiments of the invention enable simple attachment of the device to the helmet and furthermore a simple and tight attachment of the device to the visor of the helmet or the lens of the breathing mask. Furthermore, the movable connection also allows the device to be swivelled up out of the field of vision range if this is desired. 
   Furthermore, the camera can be attached to the mounting means so that a compact system results which if necessary can be attached to the helmet. 
   Alternatively it can also be provided that the mounting means comprises a shell which is adapted to the helmet and into which the camera is preferably integrated. This embodiment entails the advantage that the camera can be integrated well protected into the shell so that the service life of the camera can be greatly lengthened. 
   In order to display the images recorded by the camera on the screen, preferably a display unit is used, as is described in European patent application no. 99 890 374.4 of the applicant of this application, the contents of the European patent application no. 99 890 374.4 being expressly declared the contents of this patent application. 
   In other words, the partially transparent reflector of application number 99 890 374.4 can be used as the screen of this application; the images from at least one projector which has been integrated into the mask as claimed in patent application 99 890 374.4 can be seen on this reflector. 
   Alternatively, it is however also possible for example for there to be two screens which are each surrounded by one frame with a seal and are located in the field of vision of one eye, and for the frames to be attached to a clip-shaped connection. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
     One preferred embodiment of this invention is detailed with reference to the attached drawings. 
       FIGS. 1 and 2  show the standard equipment of a fireman, consisting of a helmet and a breathing mask in a front and side view, 
       FIGS. 3 and 4  show a device as claimed in the invention in the form of a mask with a mounting means and a camera in a front and side view, 
       FIGS. 5 and 6  show the arrangement from  FIG. 3  in the state mounted on the equipment from  FIGS. 1 and 2  in a front and side view and 
       FIGS. 7 and 8  shows a second embodiment of the device as claimed in the invention in the state mounted on the equipment from  FIGS. 1 and 2  in a front and side view. 
   

   DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     FIGS. 1 and 2  show the head  1  of the fireman who is wearing a helmet  2  with a breathing mask  3 . The breathing mask  3  is equipped with a filter  4  and a lens  5 . 
     FIGS. 3 and 4  show a device as claimed in the invention in the form of a mask  6  which can be attached via the mounting system  7  to the helmet  2  and in a further sequence to the breathing mask  3 . 
   The mounting means  7  consists essentially of a main belt  8  and a connecting belt  9  which is guided through openings  10  on the back end  11  of the main belt  8 . The main belt  8  and the connecting belt  9  are arranged roughly in a x-shape. The main belt  8  cannot stretch, conversely the connecting belt  9  is rubber-elastic in order to clamp the mounting means  7  tightly to the helmet. The front end  12  of the main belt  8  is attached to the top of an infrared camera  13  which for its part is connected via a connecting part  14  and a movable connection  15  to the mask  6 . 
   In order to be able to adjust the tilt of the camera  13  to the horizontal, on the bottom of the connecting part  14  there is an adapter  16  via which the connecting part  14  adjoins the helmet  2 . By choosing the wedge angle of the adapter  16 , the tilt of the infrared camera  13  to the horizontal can be changed. 
   In order to enable simple attachment of the mounting device  7  to the helmet  2 , on the connecting part  16  there is a hook  21  which can be hooked on the front edge  22  of the helmet  2 . Similarly, on the ends  23  of the connecting belt  9  there are attachment clamps  24  which can be hooked on either side on the rear edge  25  of the helmet  2 ; this takes place such that the connecting belt  9  is tensioned so strongly that the mounting device  7  together with the infrared camera  13  and the mask  6  is attached relatively securely to the helmet  2 . Instead of the elastic connecting belt  9  of course there can also be another form of a belt with a variable length, with which the mounting device  7  can be lashed to the helmet  2 . 
   The movable connection  15  makes it possible to swivel the mask  6 , as is shown by the broken lines in  FIGS. 4 and 6 . This entails the major advantages that the mask can be adapted largely independently to the helmet shapes and sizes and the shapes and sizes of the breathing mask and the mask  6  if necessary can be easily swivelled up and thus vision for the fireman  1  can be cleared. 
   As shown in  FIG. 4 , the connection can be a flexible connection, but it can also be replaced by other forms of joints. It is preferred if the connection  15  is made such that it presses the mask  6 , when the latter is swivelled down, securely against the lens  5  in order to press the seal  17  on the frame  18  of the mask to form a seal against the lens  5  which is used as the contact surface. 
   In order to reliably seal the space  19  between the lens  20  of the mask  6 , the frame  18 , the seal  17  and the lens  5  of the breathing mask  3 , furthermore on either side of the mask  6  there can be an attachment means  30  in the form of hooks, elastic loops or the like which can be hooked or suspended on the breathing mask  3 . 
   In order to enable simple attachment of the mounting means  7  to the helmet  2 , on the connecting part  14  there is a hook  21  which can be hooked onto the front edge  22  of the helmet  2 . Similarly, on the ends  23  of the connecting belt  9  there can be attachment clamps  24  which can be hooked on either side on the rear edge  25  of the helmet  2 ; this takes place such that the connecting belt  9  is tensioned so strongly that the mounting means  7  together with the infrared camera  13  and the mask  6  is attached relatively securely to the helmet  2 . Instead of the elastic connecting belt  9  there can of course naturally also be another form of a belt with a variable length, with which the mounting means  7  can be lashed to the helmet  2 . 
   As already mentioned, it is preferred if the display unit is integrated into the mask  6 , as is described in patent application no. 99 890 374.4. Since the disclosure of this latter application was accepted by reference into the disclosure of this application, it is simply briefly explained that in the embodiment shown in  FIGS. 4 and 6 , there are two projectors  26  in the area of the upper edge of the mask  6 , that the lens  20  forms the reflection surface and that in the beam path between the projector  26 , the reflection surface  20  and the eyes of the fireman there is a semitransparent mirror  27 . 
   It is pointed out that in this invention it is preferred if the display unit is integrated into the mask as is described in application no. 99 890 374.4, but that also any other type of display of images recorded via a camera, as are known from the prior art, can be used. 
   As is shown in  FIGS. 4 and 6 , on one side of the connecting belt  9  there is a housing  28  for batteries  29  for the infrared camera  13  and the projector  26 . 
     FIGS. 7 and 8  describe another embodiment of the device as claimed in the invention which is labelled  31 . The device  31  is in turn attached to the mounting means  7  which has a structure as described with reference to  FIGS. 3  to  6 . 
   The device  31  consists essentially of two lateral clips  32  which are connected via a joint  33  to the connecting part  14 . On the end opposite the joint  33  on each clip  32  there is a screen  34 , for example, a LCD screen. One screen  34  at a time is assigned to one eye of the individual  1 , and if necessary an optical system for better or enlarged display of the image can be connected upstream of the screen  34 . The screens  34  are in turn held in the frame  35  which forms a seal as it adjoins the lens  5  of the breathing mask  3  via a seal which is not shown. The frame  35  or the ends of the clips  32  are finally connected to one another via a clip or a flexible or elastic belt  36 . 
   The drawings do not show the sending and receiving system for data which are transferred via radio, for example in order to have the fireman receive information in this way, such as floor plans or other special barriers. Furthermore, it is also possible to transmit to the command center with the transmitter the images recorded by the infrared camera and other data, such as pressures or temperatures or the like, which data can of course also be displayed to the fireman  1  via the display unit in the mask  6 . 
   Finally, it is also noted that the mask as claimed in the invention is especially well suited not only for the use among firemen, but also for many other purposes, such as for example in motorcycle helmets, in safety engineering, in border protection, in diving and the like.