Wiper Device for Dome

Abstract

A wiper device for dome for cleaning a spherical clear dome window ( 2 ) arranged at the front of a housing comprises: a semi-circularly arced wiper arm ( 3 ) having rotatable structures on its both ends fitted to near the central axis of the spherical clear dome window ( 2 ) of the housing; a blow structure ( 17 ) for blowing a pressurized fluid formed inside of the wiper arm ( 3 ) which is arranged at a predetermined distance from a curved surface of the spherical clear dome window ( 2 ) without contacting with clear dome window; and a driving means for rotating the wiper arm ( 3 ) reciprocatingly as the pressurized fluid being introduced into the wiper arm from the one end of the wiper arm. As a result, the wiper device for dome can clean the spherical clear dome window arranged at the front of a housing for accommodating a TV camera, a video camera or the like installed in a building without damaging the spherical clear dome window.

1 . A wiper device for dome for cleaning a spherical clear dome window arranged at the front of a housing, said housing accommodating: 
 a camera, an image amplifying circuit, control circuits constituted mainly by processors, a mechanical unit for operating the camera, a driving unit for driving a wiper arm, a pressurized fluid generating unit and a heating unit for heating the pressurized fluid, said wipe device for dome comprising:    a semi-circularly arced wiper arm having a pressurized fluid passage for circulating the pressurized fluid and rotatable structures on its both ends fitted to near the central axis of said spherical clear dome window of said housing;    a blow structure for blowing a pressurized fluid formed inside of said wiper arm which is arranged at a predetermined distance from a curved surface of said spherical clear dome window without contacting with said clear dome window, wherein:    the pressurized fluid is introduced into said wiper arm from the one end of said wiper arm; and    the introduced pressurized fluid is blown from said blow structure against the curved surface of said clear dome window as said wiper arm being rotated reciprocatingly.    
   
   
       2 . The wiper device for dome according to  claim 1 , wherein: 
 said wiper arm is rotated along the curved surface of said clear dome window reciprocatingly;    the pressurized fluid is blown from the inside of said wiper arm against said clear dome window from a time when said rotating wiper arm is positioned at one end of said clear dome window to a time when said rotating wiper arm reaches a center of said clear dome window;    the pressurized fluid is stopped blowing from said wiper arm from the time when said rotating wiper arm is positioned at the center of said clear dome window to a time when said rotating wiper arm reaches the other end of said clear dome window; and    the pressurized fluid is blown again from said wiper arm from the time when said rotating wiper arm is positioned at the other end of said clear dome window to a time when said rotating wiper arm reaches the center of said clear dome window.    
   
   
       3 . The wiper device for dome according to  claim 1 , wherein: 
 said blow structure is formed as a plurality of blow holes for blowing the pressurized fluid formed inside of said wiper arm and said blow holes are arranged such that a diameter of said blow hole is increased as said blow hole is formed farther apart from the one end where the pressurized fluid is introduced so as to equalize pressures of blown fluid from respective said blow holes against said clear dome window.    
   
   
       4 . The wiper device for dome according to  claim 1:   said blow structure is formed as a continuous slit or discontinuous slits inside of said wiper arm extending from the one end where the pressurized fluid is introduced to the other end.    
   
   
       5 . The wiper device for dome according to  claim 1 , wherein: 
 said driving means which rotates said wiper arm reciprocatingly is automatically operated at predetermined times in 24 hours in order to remove dirt stuck to said clear dome window.    
   
   
       6 . The wiper device for dome according to  claim 1 , wherein: 
 said driving means which rotates said wiper arm reciprocatingly comprises a luminosity sensor; and    said driving means automatically drives said wiper arm at a predetermined luminosity measured by said luminosity sensor in 24 hours in order to remove dirt stuck to said clear dome window.    
   
   
       7 . The wiper device for dome according to  claim 1 , wherein: 
 a pressurized gas or a pressurized liquid is employed as the pressurized fluid; and    the pressurized gas and the pressurized liquid can be blown alternatively such that the pressurized gas is switched to the pressurized liquid or vice versa.    
   
   
       8 . The wiper device for dome according to  claim 1 , wherein: 
 a pulverized mixture of gas and liquid is employed as the pressurized fluid blown from said blow hole.    
   
   
       9 . The wiper for dome device according to  claim 1 , wherein: 
 the pressurized fluid heated by a heater is blown from said blow hole as the hot pressurized fluid.