US 9,810,816 B2
Rod lens array unit, production method of rod lens array unit, LED print head, image sensor head, image forming apparatus, and image reader
Takahito Suzuki, Tokyo (JP)
Assigned to Oki Data Corporation, Tokyo (JP)
Filed by Oki Data Corporation, Tokyo (JP)
Filed on Feb. 19, 2016, as Appl. No. 15/48,327.
Claims priority of application No. 2015-071984 (JP), filed on Mar. 31, 2015.
Prior Publication US 2016/0291215 A1, Oct. 6, 2016
Int. Cl. H04N 1/024 (2006.01); H04N 1/04 (2006.01); G02B 3/00 (2006.01)
CPC G02B 3/0075 (2013.01) [G02B 3/005 (2013.01); G02B 3/0025 (2013.01); H04N 1/02445 (2013.01); H04N 2201/0081 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A rod lens array unit, comprising:
at least a rod lens array that includes a plurality of rod lenses arranged in a line, each of the rod lenses having an optical axis extending in an optical axis direction, the rod lens array having a first surface at one end of the optical axis direction and another first surface at the other end of the optical axis direction;
a pair of side plate parts stacked so as to sandwich the rod lens array in a thick direction that is orthogonal to the optical axis direction, the side plate parts each having a second surface at the one end of the optical axis direction and another second surface at the other end of the optical axis direction, and
an adhesive part that is formed mainly of an adhesive and interposes between the rod lens array and one of the side plate parts with a predetermined thickness (D1) in the thick direction, another adhesive part having an adhesive end face at the one end of the optical direction, wherein
at the one end of the optical axis direction,
the first surface protrudes from the second surface in the optical axis direction,
composed with a protrusion face and a recess face that is recessed from the protrusion face by a protrusion distance (D3) in the optical axis direction, the protrusion face being positioned closer to the first surface than the recess face in the thick direction,
protrusion face of the adhesive end face is flush with the first surface in the thick direction, and
the recess face of the adhesive end face is flush with the second surface in the thick direction.