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US 7,859,757 B2Granted
Lens-array, exposure device, image forming apparatus and reading apparatus
AssigneeOki Data Corporation
InventorAkihiro Yamamura
Life of this patent
Estimating the term…
Abstract
A lens array includes a plurality of lens groups each of which includes lenses so disposed that optical axes thereof are aligned with each other. The lens groups are arranged in a direction perpendicular to the optical axes. A light-blocking portion is provided for shielding each of the lens group from light having passed through any lens of other lens group. A largest diameter D of the lens and an arrangement interval P at which the lens groups are arranged satisfy the relationship: P<D.
Claims33
A lens array comprising:
- a plurality of lens groups each of which includes lenses having noncircular shapes so disposed that optical axes thereof are aligned with each other, said lens groups being arranged in a direction perpendicular to said optical axes, and
- a light-blocking portion that shields each of said lens groups from light having passed through any lens of other lens groups, said light-blocking portion having a plurality of opening provided corresponding to said lens groups so as to cause light to pass through respective lens groups, said opening having center axes aligned with said optical axes,
- wherein a largest diameter D of said lens and a center-to-center distance P of adjacent lens groups satisfy the relationship:
- P<D,
- wherein each of said openings has a width WX in a direction substantially perpendicular to an arrangement direction of said lens groups, and has a width WY in a direction substantially parallel to said arrangement direction, said widths WX and WY satisfying the relationship:
- WY<WX,
- wherein said opening has a substantially cylindrical shape whose diameter is the same as said width WX and which is bounded by two planes parallel to said optical axis, said two planes being distanced from each other at a distance which is the same as said width WY.
4 more elements
A lens array comprising:
- a plurality of lenses,
- said plurality of lenses comprising:
- first and second lenses arranged in a first direction perpendicular to optical axes of said first and second lenses, a center-to-center distance of said first and second lenses being expressed as PY, and
- third and fourth lenses arranged in a second direction perpendicular to optical axes of said third and fourth lenses, a center-to-center distance of said third and fourth lenses being expressed as PN,
- wherein said center-to-center distances PY and PN satisfy the relationship:
- PY>PN, and
- wherein said first direction and said second direction are inclined with respect to each other, without being perpendicular to each other.
4 more elements
A lens array comprising a plurality of lenses,
- said plurality of lenses comprising:
- first and second lenses disposed adjacent to each other,
- wherein an interval PN2 between optical axes of said first and second lenses and a largest distance rL between an optical axis and a periphery of each of said first and second lenses satisfy the relationship:
- PN2<2rL.
1 more element
A lens array comprising:
- a plurality of lenses arranged in at least two rows, and
- a light-blocking portion provided between said rows for shielding each lens from light having passed through adjacent lens across said rows,
- wherein said light-blocking portion is made of a material that blocks the light and has a plurality of openings,
- wherein each of said openings has a width WX in a direction substantially perpendicular to an arranging direction of said lenses, and has a width WY in a direction substantially parallel to said arranging direction, said widths WX and WY being defined in a plane perpendicular to optical axes of said lenses, said widths WX and WY satisfying the relationship:
- WY<WX,
- wherein said openings have center axes aligned with optical axes of said lenses, and
- wherein each of said openings has a substantially cylindrical shape whose diameter is the same as said width WX and which is bounded by two planes parallel to said optical axes, said two planes being distanced from each other at a distance which is the same as said width WY.
4 more elements
Dependencies are inferred from the claim text.