Image forming apparatus, optical scanning device, and plastic lens
A plastic lens, optical scanning technology, applied in optics, lenses, optical components, etc., can solve the problems of slow resin cooling, uneven resin temperature distribution, and difficulty in preferentially cooling plastic lenses.
Active Publication Date: 2009-07-01
RICOH KK
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Problems solved by technology
As a result, it is difficult to perform operations that direct recesses to surfaces other than light incident or emitted surfaces
[0011] In addition, it is difficult to preferentially cool the central part of the plastic lens, where the cooling rate of the resin is the slowest, so the temperature distribution of the resin may become uneven
Method used
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[0036] In describing the embodiments illustrated in the drawings, specific terminology will be employed for the sake of clarity. However, the disclosure of this patent specification is not intended to be limited to the specific terms used, and it is understood that substitutions for each specific element include any technical equivalents that operate in a similar manner.
[0037] A mold for molding a plastic lens according to an embodiment of the present invention will now be described with reference to the accompanying drawings, in which like reference numerals designate like or corresponding parts.
[0038] A mold for molding a plastic lens includes a pair of first molding blocks and a pair of second molding blocks. The first casting modules are respectively configured to replicate the light incident surface and the light emitting surface. The second casting blocks are provided to both ends of the first casting block to be parallel to the optical axis direction and face eac...
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The invention provides a plastic lens used for casting in a mould of a casting plastic lens. The mould used on the casting plastic lens comprises the components as follows: a pair of first casting moulds: the pair of first casting moulds are deployed for reproducing a light-incident surface and a light-emitting surface; a pair of second casting moulds: the pair of second casting moulds are arranged at the two ends of the first casting moulds and are parallel to and faces to the optical axis direction, each deployment of the second casting moulds is used for reproducing a non-light penetrating surface, and at least one of the second casting moulds comprises a vent-hole which is described as an elongated slit equal to or longer than the length of light in the effective range and is elongated in the main scanning direction of the light-incident surface and the light-emitting surface along a line in a same distance away from the light-incident surface and the light-emitting surface; the air is sprayed out from the vent-hole on the melt resin in the mould used on the casting plastic lens for cooling down the resin in the process of cooling down and solidifying resin. The invention also provides an image formation device and an optical scanning device.
Description
[0001] Cross References to Related Applications [0002] This application claims Japanese Patent Application No. 2007-339700 filed on December 28, 2007, the entire contents of which are incorporated herein by reference. technical field [0003] The present invention relates to image forming apparatuses such as color digital copiers, multifunction printers (MFPs), laser printers, facsimile machines, plotters, and multifunction machines combining the functions of these apparatuses and optical scanning devices and image forming apparatuses. Forms plastic lenses in equipment and optical scanning devices. Background technique [0004] Existing optical writing units installed in laser digital copiers, printers, facsimile machines, etc. include, as their main components, rectangular optical devices (such as lenses and mirrors) that have the function of forming an image with laser light and correcting the The function of the image formed. [0005] In order to reduce costs, plastic...
Claims
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IPC IPC(8): B29C33/04G02B3/00
CPCB29C33/046B29C45/7337B29L2011/0016
Inventor 高桥刚林英一青木干岩松明宏
Owner RICOH KK