JP2019120776A - Optical scanner and method for manufacturing the same - Google Patents

Abstract

To provide an optical scanner in which even in a case where a reinforcement member warps, the warpage does not affect the attitude of an optical member in a housing.SOLUTION: A method for manufacturing an optical scanner is for an optical scanner 10 including a main body optical part 11 which enables the scanning of a light beam on image carriers 21a, 21b, 21c, and 21d and a resin-made housing part 19 which holds the main body optical part 11. A reinforcement member 32 is arranged in at least the support part 19c to which a deflector 13 is attached of the resin-made housing part 19. In such a state that the reinforcement member 32 is previously held in the cavity of a mold for forming the resin-made housing part 19, a resin for forming the resin-made housing part 19 is injected into the cavity CV in a molten state, to obtain the resin-made housing part 19 in which the reinforcement member 32 and a resin material are integrated.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an optical scanning device incorporated in a digital copier or other image forming apparatus and a method of manufacturing the same, and more particularly, an optical scanning device having a deflector for deflecting and scanning light irradiated to an image carrier and its manufacturing It relates to the method.

  Although the print head housing of the image forming apparatus, that is, the housing of the optical scanning device has been conventionally made of metal, resinification is in progress for the purpose of reducing manufacturing costs. However, in a resin housing, thermal expansion of the resin occurs due to heat generated when the deflector mounted in the housing rotates, and the posture of the deflector or other optical member that requires high dimensional accuracy changes. Due to the change of the posture, the irradiation position of the light to the image carrier (photosensitive member) is shifted, which causes a problem of causing a color shift. By fixing a reinforcing member made of a material having a smaller linear expansion coefficient than the material of the housing to the housing by using a fastening member in the area surrounding the deflector on the bottom outside of the housing, the attitude of the optical member due to thermal expansion of the resin housing. A method of suppressing the change has been proposed (see Patent Document 1).

However, since the housing used for the optical scanning device is required to have high dimensional accuracy (for example, minimum tolerance ± 15 μm), in this method, the housing is affected by the warp of the reinforcing member at the time of fastening the reinforcing member, and the optical member Deformation occurs in the posture of In addition, if the reinforcing member is warped, there is a possibility that an area which does not contact between the reinforcing member and the housing may be formed, so that the vibration of the deflector causes chattering and an image defect occurs. As described above, the warpage of the reinforcing member is a problem, but in order to finish the reinforcing member with high accuracy, complicated mold configuration and high measurement accuracy are required, which leads to an increase in manufacturing cost.
JP, 2009-251308, A

  The present invention has been made in view of the above-mentioned problems of the background art, and an optical scanning device in which the warp does not affect the posture of the optical member in the housing even when the reinforcing member has a warp, and a manufacturing method thereof The purpose is to propose.

  In order to solve the above problems, a method of manufacturing an optical scanning device according to the present invention includes an optical unit having a light source, a deflector, a scanning lens, and a mirror and capable of scanning a light beam on an image carrier An optical scanning device including a resin housing portion for holding a mold, wherein a reinforcing member is disposed in at least a support portion of the resin housing portion to which the deflector is attached, and a molding die for forming the resin housing portion With the reinforcing member held in advance in the cavity, the resin forming the resin housing portion is injected in a molten state into the cavity to obtain a resin housing portion in which the reinforcing member and the resin material are integrated.

  According to the above manufacturing method, in a state where the reinforcing member is held in advance in the cavity of the mold that forms the resin housing portion, the resin that forms the resin housing portion is injected by injecting it into the cavity in a molten state. Since the resin housing portion in which the member and the resin material are integrated is obtained, the resin is joined to the reinforcing member during the molten state, and the resin shape of the joining portion is formed in accordance with the warpage of the reinforcing member. Therefore, even when the reinforcing member is warped, a region not in contact with the reinforcing member and the resin housing portion does not occur, so that occurrence of so-called chatter due to partial fixing failure can be prevented, and image defects It becomes easy to control. In addition, since the mounting surface of the optical member is simultaneously formed at the time of joining with the reinforcing member, it is not affected by the warp of the reinforcing member.

  According to a specific aspect of the present invention, in the method of manufacturing an optical scanning device, the mold has a holding part for supporting the reinforcing member in the cavity. In this case, the reinforcing member is stably supported in the cavity during molding.

  In another aspect of the present invention, the mold includes first and second molds forming at least a portion of the cavity, and third and fourth supporting the first mold and the second mold on opposite sides of the cavity, respectively. And a holding part including a fourth mold disposed through the first mold and in contact with the third mold, and disposed through the second mold and in contact with the fourth mold And a holding part. In this case, the reinforcing member is supported from the front and back, and the support is stabilized.

  In another aspect of the present invention, at least one of the holding parts has an elastic body at a portion in contact with the third or fourth mold. In this case, the reinforcing member is supported by a desired mechanism with a simple mechanism, and the support is more stable.

  In still another aspect of the present invention, the reinforcing member is inserted into the cavity in a state where the resin is melted from an inlet provided in one of the first mold and the second mold in a state where the reinforcing member is held in the cavity. A through hole is provided at at least one location for guiding the reinforcing member on the surface opposite to the surface on the inlet side of the reinforcing member. In this case, it is possible to prevent the resin pressure from being largely different between the front and back of the reinforcing member.

  In still another aspect of the present invention, the area in contact with the injected resin in the surface on the inlet side of the reinforcing member and the area in contact with the injected resin in the surface opposite to the inlet of the reinforcing member are substantially equal. . In this case, the force acting between the reinforcing member and the resin material can be equalized on the inlet side and the non-inlet side, and distortion of the arrangement of the mounting surface of the optical member can be suppressed after the molded product is taken out.

  In order to solve the above-mentioned subject, an optical scanning device concerning the present invention has a light source, a deflector, a scanning lens, and a mirror, and holds an optical part which enables scanning of a light beam on an image carrier and an optical part. A reinforcing member is integrally formed on a support portion to which at least a deflector is attached in the resin housing portion, and the deflector is a support formed of resin on the reinforcing member. It fixes to the reinforcement member of a support part via the side fixing part.

  According to the above optical scanning device, since the reinforcing member integrated with the resin material is disposed at least in the support portion to which the deflector is attached in the resin housing portion, the warpage of the reinforcing member is suppressed and the attachment accuracy of the deflector is achieved. Can be kept high.

According to a specific aspect of the present invention, in the optical scanning device, the melting point of the reinforcing member is Tm, the melting point of the resin forming the resin housing portion is Tm1, and Tm2 of the melting point of the resin forming the support side fixing portion , The following relationship: Tm> Tm1, and Tm> Tm2
Is true. In this case, the reinforcing member can be integrated while maintaining its original shape without being melted and deformed by the molten resin.

In another aspect of the present invention, the linear expansion coefficient of the reinforcing member is α, the linear expansion coefficient of the resin forming the resin housing portion is α1, and the linear expansion coefficient of the resin forming the support side fixing portion is α2 , The following relationship α <α1 and α <α2
Is true. In this case, it is possible to suppress the change in posture of the resin housing due to the temperature rise, and it is possible to suppress the displacement of the deflector in an unintended direction.

  In still another aspect of the present invention, the reinforcing member extends in a range to cover the outer shape of the deflector in plan view. In this case, the fixing of the deflector is stable, and the mounting accuracy of the deflector can be maintained high.

FIG. 2 is a conceptual side cross-sectional view illustrating the optical structure of an optical scanning device manufactured by an embodiment of the manufacturing method according to the present invention. It is a conceptual diagram explaining the structure of the resin-made housing parts of an optical scanning device. It is a figure explaining the image forming apparatus incorporating the optical scanning device of FIG. It is a notional side sectional view of a forming device which has a forming die used with a manufacturing method of an optical scanning device. It is a figure explaining the manufacturing process of the resin-made housing parts. It is a figure explaining the manufacturing process of the resin-made housing parts.

  As shown in FIG. 1, the optical scanning device 10 manufactured by the manufacturing method of the present invention is, for example, a photoconductor corresponding to each color of yellow (Y), magenta (M), cyan (C), and black (K). A main optical unit 11 for forming an electrostatic latent image by irradiating light onto the surfaces of the image carriers (photosensitive members) 21a, 21b, 21c and 21d, and a resin housing for holding the main optical unit 11 And a part 19.

  The main body optical unit 11 includes a light source 12 including a plurality of semiconductor lasers corresponding to a plurality of colors Y, M, C, and K, a deflector 13 that deflects and scans a light flux emitted from the light source 12, and a deflector 13 A plurality of optical scanning systems 14a, 14b, 14c, and 14d are provided, which guide the light beams having passed through them onto the surfaces of cylindrical image carriers 21a, 21b, 21c, and 21d, respectively. Here, the light sources 12 are a plurality of light sources that are controlled to emit light independently according to image information. The deflector 13 has a rotary polygon mirror 13a that reflects light of a plurality of colors from the light source 12 toward the optical scanning systems 14a, 14b, 14c, and 14d, and a motor unit 13b that rotates the rotary polygon mirror 13a. The lower surface side of the deflector 13 is an element side fixing portion 135 for attaching the deflector 13 to the resin housing portion 19. The element-side fixing portion 135 of the deflector 13 is formed of, for example, a resin, but is not limited to this. The first optical scanning system 14a has a first scanning lens 15i, a second scanning lens 16a, and a mirror 17a. The second optical scanning system 14b has a first scanning lens 15i and a second scanning lens. 16b and mirrors 17b and 18b. The third optical scanning system 14c includes a first scanning lens 15j, a second scanning lens 16c, and mirrors 17c and 18c. The fourth optical scanning system 14d includes a first scanning lens 15j and a second scanning lens 15c. It has a scanning lens 16d and a mirror 17d.

  As shown in FIG. 2A, the resin housing portion 19 of the optical scanning device 10 is an outer frame portion 19a fixed in the image forming apparatus described later and a flat plate portion supported from the periphery by the outer frame portion 19a. 19b, a first supporting portion 19c provided so as to accompany the flat plate portion 19b to support the deflector 13 of the main optical unit 11, and provided so as to accompany the flat plate portion 19b, and optical scanning systems 14a, 14b, A second support portion 19d for supporting a lens or a mirror which is an optical component 24 of 14c and 14d is provided.

  As shown in an enlarged manner in FIGS. 2B and 2C, the first support portion 19c includes an outer resin portion 31a, an inner resin portion 31b, and a reinforcing member 32. The outer resin portion 31a is a portion integrally molded with the flat plate portion 19b, and the inner resin portion 31b is supported by the outer resin portion 31a via the reinforcing member 32, and a plurality of column-shaped protrusions 31d extending upward are provided. Have. The reinforcing member 32 is formed to be embedded in the inner resin portion 31 b in a region surrounded by the outer resin portion 31 a. In the reinforcing member 32, a through hole 32d is formed at a position corresponding to the protrusion 31d of the inner resin portion 31b. The through holes 32d are filled with the resin flowing downward from the protrusions 31d. Of the inner resin portion 31b, the plate-like portion 31k excluding the protrusion 31d is a resin covering layer that covers the upper and lower sides of the metal reinforcing member 32, and a three-layer structure of a composite material is formed. . The plurality of protrusions 31 d function as a support side fixing portion 35 for attaching the deflector 13. That is, the plurality of protrusions 31 d or the support side fixing portion 35 support the element side fixing portion 135 formed on the lower surface side of the deflector 13 at the tip end side. The tip of the protrusion 31 d is a mounting surface 19 f for fixing the element-side fixing portion 135, but can be formed with high accuracy at the time of injection molding of the resin housing portion 19. The inner edge portion of the outer resin portion 31a is also a covering layer sandwiching the reinforcing member 32 from above and below, and a three-layer structure of a composite material is formed. Here, the upper side of the reinforcing member 32 is the inlet side described later, and the area in contact with the injected resin material on the surface of the reinforcing member 32 on the inlet side, and the non-inlet that is the lower side of the reinforcing member 32 The area in contact with the injected resin material on the side surface is substantially equal. Thereby, the force acting between the reinforcing member 32 and the resin material is equalized on the inlet side and the non-inlet side, and the reinforcing member 32 placed in the mold is directed to the half inlet side by the resin pressure. It is possible to prevent distortion.

  The protrusion 31 d of the first support 19 c or the upper end of the support-side fixing portion 35 is, for example, press-fit to the element-side fixing portion 135 of the deflector 13 by press fitting. It can be provided. The support side fixing portion 35 and the element side fixing portion 135 can be fixed by an adhesive and can be connected by an auxiliary fastener.

  The material of the resin housing portion 19, that is, the outer resin portion 31a, the inner resin portion 31b, and the like that constitute the first support portion 19c is made of, for example, a resin material such as PC or ABS from the viewpoint of cost. Here, PC is a polycarbonate and ABS is an acrylonitrile butadiene styrene copolymer. Further, the reinforcing member 32 of the first support portion 19c is formed of, for example, a metal material such as stainless steel.

  As shown in FIG. 2C, in a plan view of the reinforcing member 32 of the first support 19c, the reinforcing member 32 extends in such a range as to cover the outer shape of the deflector 13. That is, the outline or contour of the reinforcing member 32 exists outside the outline or contour of the deflector 13. In this case, the fixing of the deflector 13 is stabilized by the reinforcing member 32 of a sufficient size, and the mounting accuracy of the deflector 13 can be maintained high.

When the melting point of the resin forming the housing 19 made of resin is Tm 1 (° C.) and Tm 2 (° C.) of the melting point of the resin forming the supporting side fixing portion 35, the melting point Tm of the reinforcing member 32 of the first support 19 c. For [° C.], the following relationship Tm> Tm1 and Tm> Tm2
Is true. In the case where the resin housing portion 19 including the support side fixing portion 35 is molded at one time, Tm1 = Tm2, but in the case where the main body of the resin housing portion 19 and the support side fixing portion 35 are formed separately , Tm1 does not necessarily become Tm2. For example, in the case where two-color molding of the resin housing portion 19 is performed, Tm1 ≠ Tm2 may be obtained.

Further, when the linear expansion coefficient of the resin forming the resin housing portion 19 is α 1 [1 / K] and the linear expansion coefficient of the resin forming the support side fixing portion 35 is α 2 [1 / K], reinforcement is performed. The linear expansion coefficient α [1 / K] of the member 32 has the following relationship α <α1 and α <α2
Is true. In this case, it is possible to prevent the compressive stress from acting on the reinforcing member 32 due to the temperature rise, and it is possible to suppress the change of the deflector 13 in an unintended direction.

  As shown in FIG. 3, the optical scanning device 10 shown in FIG. 1 or the like is incorporated in the image forming apparatus 100. At this time, the resin housing portion 19 of the optical scanning device 10 is fixed to the frame 2 a of the image forming apparatus 100 using bolts and other fasteners (not shown). In addition to the optical scanning device 10 and the image carriers (photosensitive members) 21a, 21b, 21c, and 21d, the image forming apparatus 100 includes a charging roller, a developing device, a transfer device, a cleaning device, etc. (not shown). And transferring the developing toner onto a sheet of paper to form an image corresponding to the original digital data on the sheet of interest.

  A molding apparatus for manufacturing the resin housing portion 19 of the optical scanning device 10 and a method of manufacturing a resin molded product, that is, the resin housing portion 19 using the same, will be described with reference to FIGS.

  The molding apparatus 200 includes, in addition to a molding die 40 for injection molding of the resin housing portion 19, mounting plates 6 and 7 that perform mold opening and closing while supporting the molding die 40, and mold clamping, The temperature control device 91 performs temperature control of the forming die 40 using a heating / cooling unit such as an electric heater or a heat medium flow path provided in the temperature sensor 40.

  The molding die 40 is composed of a first mold 41 and a second mold 42, and is held between the fixed side mounting plate 6 and the movable side mounting plate 7 provided in the molding apparatus 200. The clamping and the like are performed, and the cavity CV is formed between the two molds 41 and 42 (see FIG. 5), which makes it possible to manufacture a resin molded product by injection molding.

  Of the molding die 40, the second mold 42 can be reciprocated in the AB direction by the movable attachment plate 7 and a drive mechanism attached thereto. By moving the second mold 42 toward the first mold 41 and clamping both the molds 41 and 42, as shown in FIG. 5, a cavity CV for molding a resin molded product is formed. Be done. The cavity CV is in communication with the sprue portion SP via a runner portion RN formed in the first mold 41.

  The first mold 41 is a mold plate 61 disposed on the side of the second mold 42 that is relatively inward, and a receiving plate 64 that is relatively outward disposed and attached to the mounting plate 6 of the molding apparatus 200. And The template 61 is a first type, and the receiving plate 64 is a third type. The inner surface of the template 61 is a mold surface SS including the transfer surface PS and the like, and has a plurality of injection ports 61 d of molten resin. The receiving plate 64 is a metal plate-like member, and supports the template 61 from the back opposite to the transfer surface PS. A nozzle touch portion 65 is formed outside the support plate 64 and at one end of the sprue portion SP. In a state in which the first mold 41 and the second mold 42 are clamped, the molten resin is supplied from the supply nozzle connected to the nozzle touch portion 65 at a desired timing and pressure, and enters the cavity CV of the mold 40. Be filled.

  The first mold 41 has a plurality of holding parts 8a that penetrate the first mold plate 61 and contact the third mold receiving plate 64 in order to support the reinforcing member 32 in the cavity CV. . Each holding component 8a is a shaft-like member, and has a root portion 8b whose diameter is expanded on the receiving plate 64 side. The holding component 8 a has an elastic body 8 e at a portion in contact with the receiving plate 64, and can reciprocate in the AB direction in the through hole 61 h formed in the template 61. The elastic body 8e is sandwiched between the holding part 8a and the receiving plate 64, and biases the holding part 8a to the inner side, that is, the second mold 42 side. As a result, the holding part 8a is urged by the elastic body 8e to support the reinforcing member 32 in the cavity CV as described later. The elastic body 8e can be made of a resin material having a restoring property that returns to its original shape by being deformed according to a compression force such as rubber and removing the compression force, but may be a member such as a helical spring .

  The second mold 42 is a mold plate 71 disposed on the side of the first mold 41 that is relatively inward, and a receiving plate 74 that is relatively outward disposed and attached to the mounting plate 7 of the molding apparatus 200. And The template 71 is a second type, and the receiving plate 74 is a fourth type. The inner surface of the template 71 is a mold surface SS including the transfer surface PS and the like. The receiving plate 74 is a metal plate-like member, and supports the template 61 from the back side which is the opposite side of the transfer surface PS.

  The second mold 42 has a plurality of holding parts 9 a that penetrate the second mold plate 71 and contact the fourth mold receiving plate 74 in order to support the reinforcing member 32 in the cavity CV. . Each holding component 9a is a shaft-like member, and has a root portion 9b whose diameter is expanded on the receiving plate 74 side. The holding component 9 a has an elastic body 9 e at a portion in contact with the receiving plate 74, and can reciprocate in the AB direction in the through hole 71 h formed in the template 61. The elastic body 9e is sandwiched between the holding part 9a and the receiving plate 74, and biases the holding part 9a to the inner side, that is, the first mold 41 side. As a result, the holding part 9a is urged by the elastic body 9e to support the reinforcing member 32 in the cavity CV. The elastic body 8e can be made of a resin material having resilience, but may be a member like a helical spring.

  In addition, in order to keep the temperature of the mold at an appropriate temperature at the time of injection of the resin, the inside of the mold 40 is, for example, a heating and cooling unit such as an electric heater or a heat medium flow path, Although a thermometer etc. are formed as needed, illustration is abbreviate | omitted for the simplification of description. The operation of these temperature control management mechanisms is controlled by the temperature control unit 91 of the molding apparatus 200. Although not shown, the molding apparatus 200 includes an ejector mechanism or the like for taking out the molded product MP (see FIG. 6) along with the molding die 40.

  Hereinafter, with reference to FIGS. 4-5, the outline of the process of manufacture operation of the molded article by the said shaping | molding die 40 is demonstrated.

  First, as shown in FIG. 4, the first mold 41 and the second mold 42 are heated to a predetermined temperature (for example, 50 ° C.) by temperature control using the temperature control unit 91 of the molding apparatus 200. Do. In this state, as shown in FIG. 5, the reinforcing member 32, which is a component of the resin housing portion 19, is set in an appropriate position between the first and second molds 41 and 42, and both molds 41 and 42 are clamped. The condition is Here, the reinforcing member 32 is close to the transfer surface PS of both the molds 41 and 42, but has a clearance between the both molds 41 and 42. That is, the reinforcing member 32 is merely positioned in the cavity CV by being held between the holding parts 8a and 9a of both the molds 41 and 42, and the reinforcing member 32 receives a large stress and hardly deforms. Next, as shown in FIG. 6, the resin RM heated and melted to a predetermined temperature (for example, 250 ° C.) is injected into the cavity CV through the sprue portion SP and the like. The resin RM flows in the cavity CV and travels to every corner in the cavity CV, and the injection of the resin RM is completed. At this time, the area in contact with the resin RM injected in the surface on the injection port 61 d side of the reinforcing member 32 and the area in contact with the resin RM injected in the surface opposite to the inlet side which is the lower side of the reinforcing member 32 are substantially It is equal. Further, since the through hole 32 d is formed in the reinforcing member 32, the resin RM supplied into the cavity CV from the first mold 41 side which is the front side of the reinforcing member 32 passes through the through hole 32 d to form the reinforcing member 32. It moves quickly to the second mold 42 side which is the back side, and filling of the cavity CV becomes reliable. During injection of the resin RM and after completion of the injection, the mold 40 is set as a whole to the target temperature by temperature adjustment using the temperature adjustment unit 91, and cooling is performed by heat radiation in the injection mold 40 after injection of the resin RM is completed. The molded resin RM is rapidly solidified to mold the molded article MP. Thereafter, although not shown, the movable second mold 42 is released, and the molded article MP is taken out as the resin housing portion 19 by an ejector pin or the like (not shown).

  In addition, the reinforcement member 32 may have the curvature which generate | occur | produces in the manufacture stage. For this reason, a clearance for absorbing the warp of the reinforcing member 32 is required between the reinforcing member 32 and the both molds 41 and 42, and the resin pressure applied to the reinforcing member 32 is on the fixed side and the movable side. There is no need to make a big difference. In the manufacturing method or the molding method of the present embodiment, the holding parts 8 a and 9 a of the reinforcing member 32 secure the clearance for absorbing the warpage of the reinforcing member 32 while preventing the movement of the reinforcing member 32. Furthermore, in the present embodiment, the through holes 32 d formed in the reinforcing member 32 prevent the occurrence of a state in which the resin pressure is largely different on the front and back of the reinforcing member 32. As described above, in the present embodiment, the shape of the reinforcing member 32 is not deformed at the time of mold clamping, and warpage is not generated in the reinforcing member 32 due to the resin pressure biased in the molding process. It can suppress that the attitude | position of the mounting surface 19f of 13 other optical components changes.

  According to the manufacturing method of the present embodiment, in a state in which the reinforcing member 32 is held in advance in the cavity CV of the mold that forms the resin housing portion 19, the cavity CV in a molten state is used for the resin that forms the resin housing portion 19. Since the resin housing portion 19 in which the reinforcing member 32 and the resin material are integrated is obtained by injecting into the inside, the resin is joined to the reinforcing member during the molten state, and the joint portion is matched with the warp of the reinforcing member 32. The resin shape is formed. Therefore, even when the reinforcing member 32 is warped, a region not in contact with the reinforcing member 32 and the resin housing portion 19 does not occur, and generation of so-called chatter due to partial fixing failure can be prevented. It becomes easy to suppress image defects. Further, since the mounting surface of the deflector 13 is simultaneously formed at the time of joining with the reinforcing member 32, it is not affected by the warpage of the reinforcing member 32.

  As mentioned above, although the present invention was described according to an embodiment, the present invention is not limited to the above-mentioned embodiment. For example, the outline of the reinforcing member 32 is not limited to a rectangle as shown in the figure, but can be a circular or any other suitable shape that matches the outline of the deflector 13. Further, the thickness of the reinforcing member 32 can also be appropriately corrected in accordance with the thickness of the resin housing portion 19, the weight of the deflector 13, and the like.

  The number and arrangement of the protrusions 31 d formed on the first support portion 19 c or the support side fixing portion 35 can be appropriately set in consideration of the size and weight of the deflector 13.

  The number and arrangement of the through holes 32d formed in the reinforcing member 32 are not limited to those illustrated either, and may not be the same as the arrangement of the protrusions 31d or the support side fixing portion 35.

  The structure of the mold 40 is also not limited to the illustrated one such as the sprue, the runner shape, the position, and the number of inlets.

  The arrangement of components in the optical scanning device 10, the shape of the resin housing portion 19, and the shape of the connecting portion with the reinforcing member 32 are not limited to those illustrated either.

  DESCRIPTION OF SYMBOLS 2a ... Frame, 6 ... Mounting plate, 7 ... Mounting plate, 8a, 9a ... Holding parts, 8e, 9e ... Elastic body, 10 ... Optical scanning device, 11 ... Main body optical part, 12 ... Light source, 13 ... Deflector, 13a ... rotating polygon mirror, 14a, 14b, 14c, 14d ... optical scanning system, 15i, 15j, 16a, 16b, 16d ... scanning lens, 19 ... resin housing part, 19a ... outer frame part, 19b ... flat plate part, 19c, 19d: support portion, 19f: mounting surface, 21a, 21b, 21c, 21d: image carrier (photoreceptor) 24, 24: optical component, 31a: outer resin portion, 31b: inner resin portion, 31d: projection portion, 31k: Plate-like portion 32 Reinforcement member 32 d Through-hole 35 Support side fixing portion 135 Element side fixing portion 40 Mold 1 41 1st mold 41 2nd mold 61, 7 DESCRIPTION OF SYMBOLS 1 ... Template, 61d ... Injection port, 61h, 71h ... Through-hole, 64, 74 ... Receiving plate, 91 ... Temperature control apparatus, 100 ... Image forming apparatus, 200 ... Molding apparatus, CV ... Cavity, MP ... Molded article, PS: transfer surface, RM: resin, SP: sprue, SS: type surface

Claims (10)

An optical unit having a light source, a deflector, a scanning lens and a mirror and capable of scanning a light beam on the image carrier;
It is a manufacturing method of an optical scanning device provided with the resin-made housing parts holding said optical part, Comprising:
A reinforcing member is disposed on a supporting portion to which at least the deflector is attached in the resin housing portion,
In a state in which the reinforcing member is held in advance in a cavity of a mold that forms the resin housing portion, the resin that forms the resin housing portion is injected in a molten state into the cavity, A method of manufacturing an optical scanning device, comprising: obtaining the resin housing portion integrated with a resin material.   The method for manufacturing an optical scanning device according to claim 1, wherein the mold has a holding part for supporting the reinforcing member in the cavity. The mold supports first and second molds forming at least a portion of the cavity, and third and fourth molds supporting the first mold and the second mold on opposite sides of the cavity, respectively. Including types and
The holding part disposed to be in contact with the third mold through the first mold, and the holding part disposed to be in contact with the fourth mold through the second mold A method of manufacturing an optical scanning device according to claim 1, characterized in that   The method for manufacturing an optical scanning device according to claim 3, wherein at least one of the holding parts has an elastic body in a portion in contact with the third or fourth mold.   The reinforcing member is injected into the cavity in a molten state from an injection port provided in one of the first mold and the second mold in a state where the reinforcing member is held in the cavity. The optical element according to any one of claims 1 to 4, wherein at least one through hole for guiding the reinforcing member on a surface opposite to the surface on the inlet side is provided. Method of manufacturing a scanning device.   An area in contact with the injected resin in the surface on the inlet side of the reinforcing member and an area in contact with the injected resin in the surface opposite to the inlet of the reinforcing member are substantially equal. A method of manufacturing an optical scanning device according to any one of claims 5 to 10. An optical unit having a light source, a deflector, a scanning lens and a mirror and capable of scanning a light beam on the image carrier;
An optical scanning device comprising: a resin housing portion for holding the optical portion;
A reinforcing member is integrally molded on at least a support portion of the resin housing portion to which the deflector is attached,
The optical scanner according to claim 1, wherein the deflector is fixed to the reinforcing member of the supporting portion via a supporting side fixing portion formed of resin on the reinforcing member. The melting point of the reinforcing member is Tm, the melting point of the resin forming the resin housing portion is Tm1, and the melting point Tm2 of the resin forming the support side fixing portion, the following relationship Tm> Tm1 and Tm> Tm2
The optical scanning device according to claim 7, wherein Assuming that the linear expansion coefficient of the reinforcing member is α, the linear expansion coefficient of the resin forming the resin housing portion is α1, and the linear expansion coefficient of the resin forming the support side fixing portion is α2, the following relationship α <Α1 and α <α2
The optical scanning device according to any one of claims 7 and 8, characterized in that   The optical scanning device according to any one of claims 7 to 9, wherein the reinforcing member extends in a range to cover the outer shape of the deflector in a plan view.

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