Optical lens or lens group, process for the production thereof, as well as optical image acquisition device

Abstract

The invention relates to an optical hybrid lens. According to the invention, the lens consists of a substrate ( 1 ) that consists of a ceramic having a predetermined shape and at least another material ( 2 ), which covers a surface of the substrate ( 1 ) at least in certain sections in order to form a lens surface. Use of an optical ceramic as a material enables an additional degree of freedom for adjusting the imaging properties of the hybrid lens. The optical ceramic may have a high refractive index and a low dispersion. The other material can be a material that can be deformed or recast at temperatures that are low in comparison to those of the optical ceramic. In particular the other material can be a low-TG glass or a polymer. The other material is directly applied onto the substrate without a further surface finishing being necessarily required. Other aspects of the invention relate to an optical lens group, an optical image acquisition device, and a process for manufacturing a hybrid lens.

1 . An optical hybrid lens consisting of: 
 a substrate that consists of a ceramic having a predetermined shape; and    at least one other material, which covers a surface of the substrate at least in certain sections for forming a lens surface;    in which optical hybrid lens 
 at least one surface of the substrate  4  that faces the other material is curved; and  
 the ceramic is an optoceramic.  
   
   
   
       2 . The optical hybrid lens according to  claim 1 , wherein a surface of the other material that faces away from the surface of the substrate is formed at least in certain sections as a spherically or aspherically curved surface or as a free-form surface or as a spherically curved surface.  
   
   
       3 . The optical hybrid lens according to  claim 1 , wherein the other material completely surrounds the substrate.  
   
   
       4 . The optical hybrid lens according to  claim 3 , wherein the other material has a greater coefficient of thermal expansion and/or a higher heat conductivity than the substrate.  
   
   
       5 . The optical hybrid lens according to  claim 1 , wherein the other material is a glass that is formed by precision blank pressing or by a casting process.  
   
   
       6 . The optical hybrid lens according to  claim 5 , wherein the glass is a low-Tg glass.  
   
   
       7 . The optical hybrid lens according to  claim 5 , wherein the glass is integrally connected to the substrate ( 1 ).  
   
   
       8 . The optical hybrid lens according to  claim 7 , wherein the glass is connected to the substrate by bonding.  
   
   
       9 . The optical hybrid lens according to  claim 1 , wherein the other material is a polymer.  
   
   
       10 . The optical hybrid lens according to  claim 9 , wherein the polymer is a thermoplastic resin.  
   
   
       11 . The optical hybrid lens according to  claim 10 , wherein the polymer is formed under the action of heat, by injection molding or by embossing.  
   
   
       12 . The optical hybrid lens according to  claim 11 , wherein the polymer is a thermosetting plastic that is formed by a casting process and curing.  
   
   
       13 . The optical hybrid lens according to  claim 9 , wherein inorganic nanoparticles are admixed into the polymer.  
   
   
       14 . The optical hybrid lens according to  claim 1 , further comprising a second material that covers, at least in certain sections, a surface of the other material and/or of the substrate in order to form a lens surface.  
   
   
       15 . The optical hybrid lens according to  claim 1 , wherein diffractive optical structures are additionally formed in or on a lens surface, said structures being formed by embossing the lens surface.  
   
   
       16 . The optical hybrid lens according to  claim 15 , wherein the other material or the second material contains a photosensitive material and the diffractive structures are formed by light exposure of the photosensitive material.  
   
   
       17 . An optical lens group comprising at least one optical hybrid lens according to  claim 1 .  
   
   
       18 . An optical image acquisition device comprising at least one optical hybrid lens according to  claim 1  for imaging incident light onto an image sensor.  
   
   
       19 . A process for manufacturing an optical hybrid lens, comprising the steps of: 
 providing a substrate consisting of a ceramic having a predetermined shape; and    applying another material on a surface of the substrate, such that the latter is covered at least in certain sections in order to form a lens surface; wherein    at least one surface of the substrate that faces the other material is formed in a curved manner, and the substrate is provided of an optoceranuc.    
   
   
       20 . The process according to  claim 19 , wherein a surface of the other material that faces away from the surface of the substrate is formed at least in certain sections as a spherically or aspherically curved surface or as a free-form surface or as a spherically curved surface.  
   
   
       21 . The process according to  claim 19 , wherein the other material ( 2 ) is applied such that the substrate is completely surrounded or enclosed.  
   
   
       22 . The process according to  claim 21 , wherein the other material has a greater coefficient of thermal expansion and/or a higher thermal conductivity than the substrate.  
   
   
       23 . The process according to  claim 19 , wherein the other material is a glass that is formed by precision blank pressing or by a casting process.  
   
   
       24 . The process according to  claim 23 , wherein the glass is a low-Tg glass.  
   
   
       25 . The process according to  claim 19 , wherein the glass is integrally connected to the substrate.  
   
   
       26 . The process according to  claim 25 , wherein the glass and ceramic are connected to the substrate by bonding.  
   
   
       27 . The process according to  claim 19 , wherein the other material is a polymer.  
   
   
       28 . The process according to  claim 27 , wherein the polymer is a thermoplastic.  
   
   
       29 . The process according to  claim 28 , wherein the polymer is formed under the action of heat, by injection molding or by embossing.  
   
   
       30 . The process according to  claim 28 , wherein the polymer is a thermosetting plastic that is formed by a casting process and curing.  
   
   
       31 . The process according to  claim 30 , wherein inorganic nanoparticles are admixed into the polymer.  
   
   
       32 . The process according to  claim 19 , further comprising the step of applying a second material onto a surface of the other material and/or the substrate, such that the latter is covered at least in certain sections in order to form a lens surface.  
   
   
       33 . The process according to  claim 19 , wherein diffractive optical structures are additionally formed in or on a lens surface.  
   
   
       34 . The process according to  claim 33 , wherein the diffractive structures are formed by embossing the lens surface.