Back to results
US 9,810,816 B2Granted
Rod lens array unit, production method of rod lens array unit, LED print head, image sensor head, image forming apparatus, and image reader
AssigneeOki Data Corporation
InventorTakahito Suzuki
Life of this patent
Estimating the term…
Abstract
A rod lens array unit includes 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, and a pair of side plate parts stacked so as to sandwich the rod lens array. Wherein, end faces of the side plate parts in the optical axis direction of the rod lens array are positioned inside an end face of the rod lens array in the optical axis direction.
Claims19
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.
5 more elements
A method for producing a rod lens array unit, the method comprising:
- respectively fixing a first side face and a second side face of a rod lens array including a plurality of rod lenses to a first side plate and a second side plate with adhesive such that the rod lens array is surrounded with an adhesive part made of the adhesive;
- forming a first long notch that penetrates the first side plate and plunges into the adhesive part such that side plate cutting edges of the adhesive part are formed;
- forming a second long notch that penetrates the second side plate and plunges into the adhesive part at a position corresponding to the first long notch such that other side plate cutting edges of the adhesive part are formed;
- and
- cutting the rod lens array with a cutting width (D7) narrower than either a width (D6) of the first long notch or a width (D6) of the second long notch in the second long notch such that rod lens cutting edges of the adhesive part are formed, wherein
- the rod lens cutting edges of the adhesive part protrude from these side plate cutting edges of the adhesive part in an optical axis direction in which optical axes of the rod lenses extend.
3 more elements
Dependencies are inferred from the claim text.