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Long-length lens

A technology of lens and lens surface, applied in the direction of lens, optics, instrument, etc., can solve the problems of large time difference, flowability difference, thickness difference and so on

Active Publication Date: 2011-10-05
BROTHER KOGYO KK
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Since the variation of the cross-sectional area along the length of the fθ lens is large, the portion closer to the center in the length direction of the fθ lens and each end portion in the length direction of the fθ lens are correspondingly closer The difference in thickness between the parts is larger, and therefore, the difference in the time it takes for the material to become solid becomes larger between the thinnest and thickest parts
[0005] The greater the difference in flowability, or the time it takes for the material to become solid, the more likely defects will occur in the molded product

Method used

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Embodiment Construction

[0016] A detailed description of exemplary embodiments of the invention will be given with reference to the accompanying drawings where appropriate. In the following description, the overall configuration of an imaging apparatus in which an optical scanner including the lens according to the present embodiment is provided will first be described, and then the structural features of the lens will be described in detail.

[0017]

[0018] as in figure 1 As shown in , a laser printer 1 (image forming apparatus) includes a body casing 2 and several components housed in the body casing 2, the components mainly including a sheet feeder for feeding a sheet S (for example, of paper) A unit 3 and an image forming unit 4 for forming an image on the sheet S.

[0019] Hereinafter, when describing the arrangement and operation of each member in the laser printer 1 , directions are specified as from the viewpoint of a user who is using (operating) the laser printer 1 . More specifically...

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Abstract

A long-length lens (100) includes a lens portion (110) having two opposite oblong surfaces (111, 112) at least one of which is a curved lens surface having a reflective power. A cross-sectional area of the lens portion (110) varies from a center toward each end in a longitudinal direction of the lens portion (110). A rib portion (120) is disposed at each of two opposite sides of the lens portion adjacent to longer sides of the oblong surfaces (111, 112) of the lens portion, and extends along the longitudinal direction of the lens portion (110). A cross-sectional area of the rib portion (110) varies along the longitudinal direction in a manner that renders variations of a cross-sectional area of a portion including the lens portion (110) and the rib portion (120) along the longitudinal direction of the lens portion (110) smaller.

Description

technical field [0001] The present invention relates to an oblong lens having two oblong surfaces opposed to each other. Background technique [0002] In the art, as a lens for use in a device such as an optical scanner of a laser printer, a lens including a lens portion having opposite two lengthwise lens surfaces (for example, an fθ lens) is known. This can be formed by pouring molten resin material into a mold through a gate to fill a cavity with molten resin material, thereafter allowing the mold to cool to solidify the material and removing the solidified casting (molded lens product) from the mold For the lens, the contour of the mold is determined to form a cavity in the shape of the lens and the temperature of the mold has been adjusted at a predetermined temperature. (For example, see JP11-183819A). [0003] A long-length lens such as an fθ lens has a cross-sectional area (ie, an area of ​​a cross-section taken along a plane perpendicular to the direction of the l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B3/06
CPCG02B3/02B41J2/471
Inventor 治部康臣藤谷淳治出野康弘
Owner BROTHER KOGYO KK
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