Polishing head for the zonal machining of optical spectacle surfaces

Abstract

A polishing head for spectacle surfaces with a basic body for attachment to a polishing spindle, with an elastic supporting part for a polishing film which is or can be attached, wherein the supporting part comprises a recess with a wall surface and a depth t, and the polishing film comprises at least one hole, wherein the hole forms an access to the recess, wherein the polishing film comprises in addition to the hole at least one further hole, which is arranged in the area of an edge of the recess and is at a radial distance a from the hole, wherein the further hole forms an outlet channel for polishing agent from out of the recess or the wall surface is raised at least over one section of the depth t, and/or with reference to a circumference, at least in segments in relation to the rotational axis D at an angle α, and/or the supporting part comprises at least one groove which is provided in the front side with a groove base and a depth t 1 , which is connected to the recess and/or the supporting part comprises at least one channel with an opening which connects the recess and the front side. A method in which a reserve supply of polishing agent is filled into the recess in the supporting part prior to the conjoining of the polishing head and the surface to be polished.

1 . A polishing head for the zonal machining of optical spectacle surfaces, comprising: a basic body which comprises a rotational axis D for attachment to a polishing spindle, with an elastic supporting part which is arranged on the basic body, on which a polishing film is arranged, wherein the supporting part comprises a recess of a depth t and the polishing film comprises at least one hole, wherein the hole forms an access to the recess, wherein the polishing film comprises, in addition to the hole, at least one further hole which is arranged in an area of an edge of the recess, and which is at a radial distance a from the hole, wherein the further hole forms an outlet channel for polishing agent from out of the recess. 
     
     
         2 . A polishing head for the zonal machining of optical spectacle surfaces, comprising: a basic body which comprises a rotational axis D for attachment to a polishing spindle and with an elastic supporting part which is arranged on the basic body, which comprises a front side for attaching a polishing film, wherein the supporting part has a recess which comprises a wall surface with a depth t, wherein the wall surface is raised at least over a part of a depth t and/or in relation to a circumference at least in segments in relation to the rotational axis D at an angle α, wherein the wall surface is designed without a re-entrant angle and/or the supporting part comprises at least one groove which is provided in the front side with a groove base and a depth t 1 , which connects to the recess, wherein the depth t 1  is less than the depth t, and/or
 the supporting part comprises at least one channel which connects the recess and the front side with an opening, wherein the opening of the channel is provided at a depth t 2  of the recess with reference to a central axis M of the channel.   
     
     
         3 . The polishing head according to  claim 2 , with a polishing film which is attached to the supporting part, or a polishing film wherein the polishing film comprises at least one hole, wherein the hole forms an access to the recess and the polishing film comprises an inner side which faces or can face the supporting part and an outer side which can be placed on the optical surface, and that the polishing film also comprises, in addition to the hole, at least one further hole with a radial distance a from the hole, which is arranged in the area of an edge of the recess and/or in the area of the groove and/or in the area of an opening of the channel, wherein the further hole forms an outflow channel for polishing agent from out of the recess, the groove and/or the opening. 
     
     
         4 . The polishing head according to  claim 2 , wherein the central axis M of the channel comprises with the rotational axis D an angle β between 25° and 60°. 
     
     
         5 . The polishing head according to  claim 2 , wherein the channel is curved or parabolic, wherein the angle β varies over the length of the channel. 
     
     
         6 . The polishing head according to  claim 1 , wherein the polishing film comprises an inner side which faces or can face the supporting part and an outer side which can be placed on the optical surface, wherein the polishing film comprises in addition to the hole at least one groove which is provided on the inner side with a groove base, and comprises on the outer side at least one recess which partially opens the groove base towards the outer side and which is at a distance d from the hole, wherein the groove with the recess forms an outflow channel for polishing agent from out of the recess. 
     
     
         7 . The polishing head according to  claim 1 , wherein the polishing film comprises a first function area F 1  and corresponding means for
 a) a lid function in partial areas of the edge of the recess by means of an overhang   b) an onward transportation function for polishing agent from out of the recess radially outwards through the groove and/or in the axial direction through the further hole.   
     
     
         8 . The polishing head according to  claim 1 , wherein the polishing film comprises a second function area F 2  and corresponding means for the outlet function for polishing agent towards the outer side through the further hole and/or through the recess. 
     
     
         9 . The polishing head according to  claim 7 , wherein the polishing film comprises a lower section with the inner side and an upper section with the outer side, wherein the first function area F 1  is assigned to the lower section and the second function area F 2  is assigned to the upper section. 
     
     
         10 . The polishing head according to  claim 1  wherein the recess comprises a volume which is at least 0.3 ml. 
     
     
         11 . The polishing head according to  claim 1 , wherein the recess is funnel and/or cup-shaped, wherein the wall surface of the recess comprises a straight or parabolic limitation line B with reference to the cross-section view. 
     
     
         12 . The polishing head according to  claim 1 , wherein the recess or at least the funnel and/or cup-shaped part of the recess is segmented into several partial segments with reference to the circumferential direction U. 
     
     
         13 . The polishing head according to  claim 1 , wherein the basic body comprises a central polishing means channel. 
     
     
         14 . A method for polishing optical spectacle surfaces with a zonal polishing tool, consisting of a polishing spindle and a polishing head arranged on it, which is formed from a basic body for attachment to the polishing spindle and an elastic supporting part which is arranged on the basic body with a recess and a polishing film which is attached to the supporting part, comprising the steps of:
 filling prior to conjoining the polishing head and the surface to be polished, a reserve supply of polishing agent into the recess in the supporting part, and/or feeding polishing agent via the polishing agent channel.   
     
     
         15 . A method according to  claim 14 , wherein this filling procedure is repeated at least once during the polishing process of the one spectacle surface. 
     
     
         16 . The polishing head according to  claim 10 , wherein the recess comprises a volume which is at least 0.6 ml. 
     
     
         17 . The polishing head according to  claim 3 , wherein the polishing film comprises an inner side which faces or can face the supporting part and an outer side which can be placed on the optical surface, wherein the polishing film comprises in addition to the hole at least one groove which is provided on the inner side with a groove base, and comprises on the outer side at least one recess which partially opens the groove base towards the outer side and which is at a distance d from the hole, wherein the groove with the recess forms an outflow channel for polishing agent from out of the recess. 
     
     
         18 . The polishing head according to  claim 17 , wherein the polishing film comprises a first function area F 1  and corresponding means for
 a) a lid function in partial areas of the edge of the recess by means of an overhang   b) an onward transportation function for polishing agent from out of the recess radially outwards through the groove and/or in the axial direction through the further hole.   
     
     
         19 . The polishing head according to  claim 18 , wherein the polishing film comprises a second function area F 2  and corresponding means for the outlet function for polishing agent towards the outer side through the further hole and/or through the recess. 
     
     
         20 . The polishing head according to  claim 19 , wherein the polishing film comprises a lower section with the inner side and an upper section with the outer side, wherein the first function area F 1  is assigned to the lower section and the second function area F 2  is assigned to the upper section.