Image pickup lens unit and image pickup device

Abstract

Lenses 1, 2 , and 4 as an optical element having a power are cemented together in an optical axis direction. An optical filter 3 is sandwiched between the lenses 2 and 4 . Optical elements neighboring each other are cemented together such that a positioning section which is disposed on a side surface of the optical element disposes an appropriate space in an optical axis direction and optical axes of optical elements align in a direction orthogonal to the optical axis. The cemented optical element arrays are cemented together and cut at a line for cutting operation. By doing this, it is possible to manufacture a small image pickup lens unit which can be used for an image pickup device in mass-production and in a low cost.

1 . An image pickup lens unit comprising: 
 an optical system; and    a plurality of optical elements which form the optical system, each of the optical elements being formed monolithically by lens surfaces which have an optical power and outer peripheries which surround the lens surfaces, wherein    a plurality of optical elements, optical axes of which are aligned, are cemented together;    side surfaces of the optical elements are disposed in a plane which extends in a direction of the optical axes    the outer periphery of the element is used for assembling the optical elements, and    the optical system is formed by cementing the outer peripheries of the lens elements.    
   
   
       2 . An image pickup lens unit which is produced by cementing a plurality of optical element arrays mutually which are provided with a plurality of optical elements of which optical axes are aligned such that optical axes of a plurality of the optical element arrays are aligned with the optical axes of a plurality of the optical elements and cutting the cemented optical element arrays in a direction of the optical axes of a plurality of the optical elements between the optical elements, wherein outer peripheries of each optical elements contact with each other.  
   
   
       3 . An image pickup unit having a plurality of optical elements which is produced by: 
 preparing a plurality of optical element arrays in which a plurality of optical elements in a plurality of the optical elements are disposed;    aligning optical axes of a plurality of the optical elements;    cementing a plurality of the optical element arrays in a direction of the optical axes of a plurality of the optical elements;    cutting between the neighboring optical elements in a direction of the optical axes of a plurality of the optical elements; and    cementing outer peripheries of each optical element so as to make contact with each other.    
   
   
       4 . An image pickup lens which is used in the image pickup lens unit according to  claim 1  wherein 0 is 60 degree or smaller in the optical element under condition that the 0 is defined as an angle made between the optical axis in an optical surface in the optical element and a normal in an effective diameter of the optical surface.  
   
   
       5 . An image pickup lens unit according to  claim 1  wherein the plurality of optical elements are provided at least with: 
 a first positive lens which has: 
 a first lens surface; and  
 a second lens surface which has a specific curve, and  
   a second positive lens which has: 
 a first lens surface which has a specific curve, and  
 a second positive lens surface, wherein  
   centers of the first lens surfaces and the second lens surfaces in the plurality of optical elements are disposed so as to be aligned with the optical axis, and    an air interval is formed between the second lens surface of the first positive lens and the first lens surface of the second positive lens by differentiating a radius of curvature of the second lens surface of the first positive lens and a radius of curvature of the first lens surface of the second positive lens.    
   
   
       6 . An image pickup lens unit according to  claim 1  wherein the second lens surface of the first positive lens is a concave surface and the first lens surface of the second positive lens is a convex surface.  
   
   
       7 . An image pickup lens unit according to the  claim 1  wherein the second lens surface of the first positive lens is a convex surface and the first lens surface on the second positive lens is a convex surface.  
   
   
       8 . An image pickup lens unit according to the  claim 1  wherein the outer periphery of the optical element is formed by a flange section and a flange side surface.