Scanning lens and method for manufacturing scanning lens
First Claim
Patent Images
1. A scanning lens molded of resin comprising:
- a lens portion having an elongate shape extending in a main scanning direction and having an optical surface;
a plurality of slant surfaces each slanting relative to the main scanning direction; and
ejector pin marks formed when thrusting out the scanning lens from a mold by ejector pins,wherein at least one slant surface and an ejector pin mark formed thereon along a slanting direction of the slant surface are provided on each of first and second sides of the lens portion in a sub-scanning direction, and wherein the ejector pin mark arranged at the first side and the ejector pin mark arranged at the second side overlap each other as viewed from the sub-scanning direction.
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Accused Products
Abstract
A scanning lens molded of resin includes: a lens portion having an elongate shape extending in a main scanning direction and having an optical surface; a slant portion having at least one slant surface slanting relative to the main scanning direction; and an ejector pin mark formed on the slant surface when thrusting out the scanning lens by ejector pins. The ejector pin mark is formed along a slanting direction of the slant surface.
3 Citations
10 Claims
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1. A scanning lens molded of resin comprising:
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a lens portion having an elongate shape extending in a main scanning direction and having an optical surface; a plurality of slant surfaces each slanting relative to the main scanning direction; and ejector pin marks formed when thrusting out the scanning lens from a mold by ejector pins, wherein at least one slant surface and an ejector pin mark formed thereon along a slanting direction of the slant surface are provided on each of first and second sides of the lens portion in a sub-scanning direction, and wherein the ejector pin mark arranged at the first side and the ejector pin mark arranged at the second side overlap each other as viewed from the sub-scanning direction. - View Dependent Claims (2, 3, 5, 10)
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4. A scanning lens molded of resin comprising:
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a lens portion having an elongate shape extending in a main scanning direction and having an optical surface; a slant portion having at least one slant surface slanting relative to the main scanning direction; and an ejector pin mark formed on the slant surface when thrusting out the scanning lens from a mold by ejector pins, wherein the ejector pin mark is formed along a slanting direction of the slant surface, wherein the slant portion includes a pair of rib portions extending in the main scanning direction and provided on first and second sides of the lens portion which are located opposite to and away from each other in a sub-scanning direction, and wherein each of the pair of rib portions has at least one slant surface and an ejector pin mark formed thereon.
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6. A method for manufacturing a scanning lens comprising a lens portion having an elongate shape extending in a main scanning direction and having an optical surface, and a plurality of slant surfaces on each of first and second sides of the lens portion in a sub-scanning direction and each slanting relative to the main scanning direction, the method comprising:
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a first step of injecting resin into a mold having a mold area corresponding to a contour of the scanning lens; and a second step of removing the scanning lens from the mold by moving ejector pins in an optical axis direction of the scanning lens, wherein the ejector pins include a plurality of ejector pins configured to thrust out said plurality of slant surfaces and each ejector pin having an end face shaped along a slanting direction of the slant surface, whereby the slant surfaces are pressed by the end faces of the ejector pins, and wherein at least one ejector pin is provided at a position corresponding to each side of the lens portion in a sub-scanning direction, and wherein at least one ejector pin arranged at one side and at least one ejector pin arranged at another side overlap each other as viewed from the sub-scanning direction. - View Dependent Claims (7, 8, 9)
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Specification