Optical print head, image forming apparatus and light amount correction method of optical print head

Abstract

An optical print head comprises a first light emitting element row, a second light emitting element row, a lens array, a first drive circuit and a second drive circuit. The first light emitting element row includes the arrangement of first light emitting elements. The second light emitting element row includes second light emitting elements arranged in parallel with the first light emitting element row. The lens array concentrates light emitted by the first light emitting elements and the second light emitting elements. The first drive circuit drives each first light emitting element with an identical first current value. The second drive circuit drives each second light emitting element with an identical second current value different from the first current value.

What is claimed is: 
     
         1 . An optical print head comprising:
 a plurality of first light emitting elements arranged in a first direction on one face of a substrate;   a plurality of second light emitting elements arranged in parallel to the first light emitting elements on the one surface, the first light emitting elements and the second light emitting elements are arranged in a zigzag manner in the first direction;   a first drive circuit located on an opposite side of a region where the second light emitting elements are located with respect to the first light emitting elements on the one surface and configured to drive each first light emitting element; and   a second drive circuit located on an opposite side of a region where the first light emitting elements are located with respect to the second light emitting elements on the one surface and configured to drive each second light emitting element.   
     
     
         2 . The optical print head according to  claim 1 , further comprising:
 a plurality of first lenses arranged in the first direction and facing the one face; and   a plurality of second lenses arranged in parallel to the first lenses and facing the one face, wherein the first lenses and the second lenses are arranged in a zigzag manner in the first direction and configured to concentrate light emitted by the first light emitting elements and the second light emitting elements.   
     
     
         3 . The optical print head according to  claim 1 , wherein
 the first light emitting element and the second light emitting element are organic electroluminescence elements.   
     
     
         4 . The optical print head according to  claim 1 , wherein
 the optical print head is for exposing a photoconductor.   
     
     
         5 . An image forming apparatus, comprising:
 a photoconductor;   an optical print head comprising:
 a plurality of first light emitting elements arranged in a first direction on one face of a substrate; 
 a plurality of second light emitting elements arranged in parallel to the first light emitting elements on the one surface, the first light emitting elements and the second light emitting elements are arranged in a zigzag manner in the first direction; 
 a first drive circuit located on an opposite side of a region where the second light emitting elements are located with respect to the first light emitting elements on the one surface and configured to drive each first light emitting element; and 
 a second drive circuit located on an opposite side of a region where the first light emitting elements are located with respect to the second light emitting elements on the one surface and configured to drive each second light emitting element, the optical print head configured to expose the photoconductor by the first light emitting elements and the second light emitting elements to form an electrostatic latent image on the photoconductor; and 
   a developing device configured to develop the electrostatic latent image to form a toner image on the photoconductor.   
     
     
         6 . The image forming apparatus according to  claim 5 , further comprising:
 a plurality of first lenses arranged in the first direction and facing the one face; and   a plurality of second lenses arranged in parallel to the first lenses and facing the one face, wherein the first lenses and the second lenses are arranged in a zigzag manner in the first direction and configured to concentrate light emitted by the first light emitting elements and the second light emitting elements.   
     
     
         7 . The image forming apparatus according to  claim 5 , wherein
 the first light emitting element and the second light emitting element are organic electroluminescence elements.