Plastic optical element, optical scanning device, and image forming apparatus using the optical scanning device
An optical element and optical scanning technology, which is applied to optical elements, equipment for electrical recording technology using charge patterns, and optics, and can solve problems such as lens accuracy degradation
Active Publication Date: 2010-03-10
RICOH KK
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Problems solved by technology
Specifically, as described in detail below, there is a problem that since the length (g) of the lens in the sub-scanning direction is smaller than its thickness (h), the surface 303 of the lens is inclined in the sub-scanning direction (as in Figure 23 shown), whereby deterioration of lens precision occurs depending on the state of the formed concave portion (ie, incompletely transferred surface)
This problem has recently become apparent as recent image forming equipment is required to reproduce high-resolution images
Method used
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[0077] Examples of the plastic optical element of the present invention will be explained with reference to the drawings.
[0078] The plastic optical element of the present invention is the thickness of the element on the light beam transmission direction (by Figure 2B Indicated by the character (a)) is less than the length of the element in the sub-scanning direction (by Figure 2B (b) represents) plastic optical components. The plastic optical element is prepared by feeding resin into a cavity of a mold having a transfer surface, and then applying pressure to the cavity such that the resin comes into pressure contact with the transfer surface of the mold. The plastic optical element has a main body and at least one rib, the main body includes at least one optically functional surface (preferably two optically functional surfaces), the optically functional surface is a transfer surface formed by contact with a transfer surface of a mould, and the The at least one rib is loc...
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A plastic optical element for guiding a scanned light beam in a main scanning direction and a sub-scanning direction, which is prepared by a molding method using a die. The element includes: a main body including at least two optically functional surfaces, which are transfer surfaces formed by contacted with transfer surfaces of the die and through which the light beam passes; and at least two ribs located on surfaces of the main body other than the optically functional surfaces and extending in parallel in the main scanning direction. A recessed portion is present on a surface of at least oneof the ribs, and the recessed portion has a side transfer surface and a bottom surface, which is a non-transfer surface, and the distance between the optically functional surfaces is less than the length of the main body in the sub-scanning direction.
Description
technical field [0001] The invention relates to a plastic optical element for an optical scanning device for an image forming device and an optical device. Furthermore, the present invention relates to an optical scanning device using the plastic optical element, an image forming apparatus using the plastic optical element, and a method for producing the plastic optical element. Background technique [0002] Recently, color image forming apparatuses using tandem-type optical devices, such as digital copiers and laser printers, have been developed and commercialized in order to meet the demand for high-speed production of high-resolution full-color images. In such a color image forming apparatus, multiple (four) light beams simultaneously irradiate multiple (four) photoreceptors (arranged side by side in the receiving material feeding direction) to form electrostatic latent images on the photoreceptors. The electrostatic latent images on the photoreceptors are developed by c...
Claims
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IPC IPC(8): G02B26/08G02B1/04G03G15/04B41J2/47B29C45/00
Inventor 高桥刚林英一青木干古泽正史大桥隆道
Owner RICOH KK