JP6898595B2 - Optical scanning device and its manufacturing method - Google Patents

Description

The present invention relates to an optical scanning device incorporated in a digital copier or other image forming apparatus and a method for manufacturing the same, and in particular, an optical scanning device having a deflector for deflecting and scanning light irradiating an image carrier and manufacturing the same. It's about the method.

The printhead housing of the image forming apparatus, that is, the housing of the optical scanning apparatus has conventionally been made of metal, but resinification is being promoted for the purpose of reducing the manufacturing cost. However, in the resin housing, the heat generated during the rotation of the deflector mounted in the housing causes thermal expansion of the resin, and the posture of the deflector and other optical members that require high dimensional accuracy changes. Due to this change in posture, the position of irradiating the image carrier (photoreceptor) with light shifts, causing a problem of color shift. By fixing a reinforcing member made of a material with a coefficient of linear expansion smaller than that of the housing material to the housing using a fastening member in the range surrounding the deflector on the outside of the bottom surface of the housing, the posture 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 in 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 when the reinforcing member is fastened, and the optical member is affected. Deformation occurs in the posture of. In addition, if the reinforcing member is warped, there is a possibility that a non-contact area is created between the reinforcing member and the housing, chattering occurs due to vibration of the deflector, and image defects occur. As described above, the warp of the reinforcing member has become an issue, but in order to finish the reinforcing member with high accuracy, the mold structure is complicated and high measurement accuracy is required, which leads to an increase in manufacturing cost.
Japanese Unexamined Patent Publication No. 2009-251308

The present invention has been made in view of the above-mentioned problems of the background technology, and an optical scanning apparatus and a method for manufacturing the same, wherein even if the reinforcing member has a warp, the warp does not affect the posture of the optical member in the housing. The purpose is to make a proposal.

In order to solve the above problems, the method for 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 enabling scanning of light rays on an image carrier, and an optical unit. The present invention relates to an optical scanning device including a resin housing portion for holding the lens, and a reinforcing member is arranged at least on a support portion to which a deflector is attached among the resin housing portions, and a molding die for forming the resin housing portion. By injecting the resin forming the resin housing portion into the cavity in a molten state while the reinforcing member is held in the cavity in advance, a resin housing portion in which the reinforcing member and the resin material are integrated is obtained.

According to the above manufacturing method, the reinforcing member is held in advance in the cavity of the molding mold forming the resin housing portion, and the resin forming the resin housing portion is injected into the cavity in a molten state to reinforce the cavity. 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 while in the molten state, and the resin shape of the joint portion is formed according to the warp of the reinforcing member. Therefore, even when the reinforcing member is warped, a non-contact area is not generated between the reinforcing member and the resin housing portion, and so-called chattering due to a partial fixing failure can be prevented, resulting in poor image quality. Suppression becomes easier. Further, since the mounting surface of the optical member is formed at the same time as joining with the reinforcing member, it is not affected by the warp of the reinforcing member.

In a specific aspect of the present invention, in the method of manufacturing the optical scanning apparatus, the molding die has a holding component that supports a reinforcing member in the cavity. In this case, the reinforcing member is stably supported in the cavity during molding.

In another aspect of the invention, the molds support the first and second molds that form at least a portion of the cavity and the third and second molds that support the first and second molds on the opposite side of the cavity, respectively. A holding component that includes a fourth mold and is arranged so as to penetrate the first mold and contact the third mold, and is arranged so as to penetrate the second mold and contact the fourth mold. Has a holding part. In this case, the reinforcing member is supported from the front and back, and the support is stable.

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

In yet another aspect of the present invention, the reinforcing member is provided in the cavity with the resin melted from the injection port provided in one of the first mold and the second mold while the reinforcing member is held in the cavity. When injected, it has at least one through hole for guiding the reinforcing member onto the surface opposite to the injection port side surface. In this case, it is possible to prevent the resin pressures from being significantly different on the front and back sides of the reinforcing member.

In yet another aspect of the present invention, the area in contact with the injected resin on the surface of the reinforcing member on the injection port side is substantially equal to the area in contact with the injected resin on the surface of the reinforcing member on the opposite side of the injection port. .. In this case, the force acting between the reinforcing member and the resin material can be balanced between the injection port side and the anti-injection port side, and it is possible to prevent the arrangement relationship of the mounting surface of the optical member from being distorted after the molded product is taken out.

In order to solve the above problems, the optical scanning apparatus according to the present invention has an optical unit, a deflector, a scanning lens, and a mirror, and holds an optical unit and an optical unit that enable scanning of light rays on the image carrier. It is provided with a resin housing portion, and a reinforcing member is integrally formed at least in a support portion to which a deflector is attached in the resin housing portion, and the deflector is a support formed of resin on the reinforcing member. It is fixed to the reinforcing member of the support portion via the side fixing portion.

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

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

In another aspect of the present invention, the coefficient of linear expansion of the reinforcing member is α, the coefficient of linear expansion of the resin forming the resin housing portion is α1, and the coefficient of linear expansion of the resin forming the support side fixing portion is α2. , The following relationship α <α1 and α <α2
Is established. In this case, it is possible to suppress the posture change 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 yet another aspect of the invention, the reinforcing member extends 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.

It is a conceptual side sectional view explaining the optical structure of the optical scanning apparatus manufactured by one Embodiment of the manufacturing method which concerns on this invention. It is a conceptual diagram explaining the structure of the resin housing part of an optical scanning apparatus. It is a figure explaining the image forming apparatus which incorporated the optical scanning apparatus of FIG. It is a conceptual side sectional view of the molding apparatus which has a molding die used in the manufacturing method of an optical scanning apparatus. It is a figure explaining the manufacturing process of the resin housing part. It is a figure explaining the manufacturing process of the resin housing part.

As shown in FIG. 1, the optical scanning apparatus 10 manufactured by the manufacturing method of the present invention is a photoconductor corresponding to each color of, for example, yellow (Y), magenta (M), cyan (C), and black (K). The main body optical unit 11 for irradiating the surfaces of the image carriers (photoreceptors) 21a, 21b, 21c, and 21d to form an electrostatic latent image, and a resin housing for holding the main body optical unit 11. It has 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. It is provided with a plurality of optical scanning systems 14a, 14b, 14c, 14d that guide the passed light source onto the surfaces of the columnar image carriers 21a, 21b, 21c, 21d, respectively. Here, the light source 12 is a plurality of light sources whose light emission is controlled independently according to the image information. The deflector 13 includes a rotary multifaceted 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 multifaceted 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, resin, but is not limited thereto. The first optical scanning system 14a includes a first scanning lens 15i, a second scanning lens 16a, and a mirror 17a, and the second optical scanning system 14b includes a first scanning lens 15i and a second scanning lens. It has 16b and mirrors 17b and 18b. The third optical scanning system 14c has a first scanning lens 15j, a second scanning lens 16c, and mirrors 17c and 18c, and the fourth optical scanning system 14d has a first scanning lens 15j and a second. It has a scanning lens 16d and a mirror 17d.

As shown in FIG. 2A, the resin housing portion 19 of the optical scanning apparatus 10 has an outer frame portion 19a fixed in the image forming apparatus described later and a flat plate portion supported from the surroundings by the outer frame portion 19a. 19b, a first support portion 19c provided to be attached to the flat plate portion 19b to support the deflector 13 of the main body optical unit 11, and optical scanning systems 14a, 14b provided to be attached to the flat plate portion 19b. It includes a second support portion 19d that supports a lens and a mirror, which are optical components 24 of 14c and 14d.

As shown enlarged 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 that is 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 support-like protrusions 31d extending upward. Has. The reinforcing member 32 is formed so as to be embedded in the inner resin portion 31b in the region surrounded by the outer resin portion 31a. 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 hole 32d is filled with the resin that has flowed downward from the protrusion 31d. The plate-shaped portion 31k of the inner resin portion 31b excluding the protrusion 31d is a resin coating layer that covers the upper and lower parts of the metal reinforcing member 32, and a three-layer structure made of a composite material is formed. .. The plurality of protrusions 31d function as support-side fixing portions 35 for mounting the deflector 13. That is, the plurality of protrusions 31d or the support-side fixing portion 35 support the element-side fixing portion 135 formed on the lower surface side of the deflector 13 on the tip end side. The tip of the protrusion 31d is a mounting surface 19f for fixing the element-side fixing portion 135, but it can be formed with high accuracy during injection molding of the resin housing portion 19. The inner edge of the outer resin portion 31a is also a coating layer that sandwiches the reinforcing member 32 from above and below, and a three-layer structure made of a composite material is formed. Here, the upper side of the reinforcing member 32 is the injection port side, which will be described later, and the area in contact with the injected resin material on the surface of the reinforcing member 32 on the injection port side and the counter inlet which 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. As a result, the force acting between the reinforcing member 32 and the resin material is balanced between the injection port side and the anti-injection port side, and the reinforcing member 32 placed in the mold is moved toward the semi-injection port side by the resin pressure. It can be prevented from being distorted.

The protrusion 31d of the first support portion 19c or the upper end of the support-side fixing portion 35 has a structure of being fitted into, for example, the element-side fixing portion 135 of the deflector 13 by press-fitting. Can be provided. The support-side fixing portion 35 and the element-side fixing portion 135 can be fixed by an adhesive or 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 constituting the first support portion 19c are made of a resin material such as PC or ABS from the viewpoint of cost, for example. Here, PC is polycarbonate and ABS is an acrylonitrile-butadiene-styrene copolymer. The reinforcing member 32 of the first support portion 19c is made of a metal material such as stainless steel.

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

When the melting point of the resin forming the resin housing portion 19 is Tm1 [° C.] and the melting point of the resin forming the support side fixing portion 35 is Tm2 [° C.], the melting point Tm of the reinforcing member 32 of the first support portion 19c. Regarding [° C.], the following relationship Tm> Tm1 and Tm> Tm2
Is established. When the resin housing portion 19 including the support side fixing portion 35 is integrally molded, Tm1 = Tm2, but when the main body of the resin housing portion 19 and the support side fixing portion 35 are individually molded. , Tm1 = Tm2 does not always hold. For example, when the resin housing portion 19 is molded in two colors, Tm1 ≠ Tm2 may occur.

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

As shown in FIG. 3, the optical scanning apparatus 10 shown in FIG. 1 and 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 2a of the image forming apparatus 100 by using bolts or other fasteners (not shown). The image forming apparatus 100 includes an optical scanning apparatus 10 and image carriers (photoreceptors) 21a, 21b, 21c, 21d, as well as a charging roller (not shown), a developing apparatus, a transfer apparatus, a cleaning apparatus, and the like. , The developing toner is transferred to the paper, and an image corresponding to the original digital data is formed on the target paper.

With reference to FIGS. 4 and 5, a molding device for manufacturing the resin housing portion 19 of the optical scanning device 10 and a method for manufacturing a resin molded product, that is, a resin housing portion 19 using the molding device will be described.

The molding apparatus 200 includes a molding die 40 for injection molding the resin housing portion 19, and mounting plates 6 and 7 for opening and closing the mold while supporting the molding die 40, and further molding the molding die. It is provided with a temperature adjusting device 91 that adjusts the temperature of the molding die 40 by using a heating / cooling unit such as an electric heater or a heat medium flow path provided in the 40.

The molding die 40 is composed of a first mold 41 and a second mold 42, and is sandwiched between a fixed-side mounting plate 6 and a movable-side mounting plate 7 provided in the molding apparatus 200. Molds are fastened, and a cavity CV is formed between both dies 41 and 42 (see FIG. 5), making it possible to manufacture a resin molded product by injection molding.

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

The first mold 41 has a mold plate 61 arranged on the side of the second mold 42, which is relatively inside, and a receiving plate 64, which is arranged relatively outside and attached to the mounting plate 6 of the molding apparatus 200. And. The template 61 is the first mold, and the receiving plate 64 is the third mold. The inner surface of the template 61 is a template SS including a transfer surface PS and the like, and has molten resin injection ports 61d at a plurality of locations. The receiving plate 64 is a metal plate-shaped member, and supports the template 61 from behind, which is the opposite side of the transfer surface PS. A nozzle touch portion 65 is formed on the outside of the receiving plate 64 at one end of the sprue portion SP. In a state where the first mold 41 and the second mold 42 are molded, the molten resin is supplied from the supply nozzle connected to the nozzle touch portion 65 at a desired timing and pressure into the cavity CV of the molding mold 40. It is filled.

The first mold 41 has a plurality of holding parts 8a that penetrate the mold plate 61 of the first mold and come into contact with the receiving plate 64 of the third mold in order to support the reinforcing member 32 in the cavity CV. .. Each holding component 8a is a shaft-shaped member, and has a root portion 8b having a wider diameter on the receiving plate 64 side. The holding component 8a has an elastic body 8e at a portion in contact with the receiving plate 64, and can reciprocate in the AB direction within the through hole 61h formed in the template 61. The elastic body 8e is sandwiched between the holding part 8a and the receiving plate 64, and urges the holding part 8a to the inside, that is, to the second mold 42 side. As a result, the holding component 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 a resin material that deforms according to a compressive force such as rubber and has a resilience that returns to its original shape by removing the compressive force, but may be a member such as a spiral spring. ..

The second mold 42 has a mold plate 71 arranged on the side of the first mold 41 which is relatively inside, and a receiving plate 74 arranged relatively outside and attached to the mounting plate 7 of the molding apparatus 200. And. The template 71 is a second mold, and the receiving plate 74 is a fourth mold. The inner surface of the template 71 is a template SS including a transfer surface PS and the like. The receiving plate 74 is a metal plate-shaped member, and supports the template 61 from behind, which is the opposite side of the transfer surface PS.

The second mold 42 has a plurality of holding parts 9a that penetrate the mold plate 71 of the second mold and come into contact with the receiving plate 74 of the fourth mold in order to support the reinforcing member 32 in the cavity CV. .. Each holding component 9a is a shaft-shaped member, and has a root portion 9b having a wider diameter on the receiving plate 74 side. The holding component 9a has an elastic body 9e at a portion in contact with the receiving plate 74, and can reciprocate in the AB direction within the through hole 71h formed in the template 61. The elastic body 9e is sandwiched between the holding part 9a and the receiving plate 74, and urges the holding part 9a to the inside, that is, to the side of the first mold 41. As a result, the holding component 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 such as a spiral spring.

In addition to the above, for example, an electric heater, a heating / cooling unit such as a heat medium flow path, and a temperature monitoring unit are used inside the molding die 40 to keep the temperature of the mold at an appropriate temperature when the resin is injected. A thermometer or the like is formed as needed, but the illustration is omitted for the sake of brevity. The operation of these temperature control control mechanisms is controlled by the temperature control unit 91 of the molding apparatus 200. Further, although not shown, the molding apparatus 200 includes an ejector mechanism and the like for taking out a molded product MP (see FIG. 6) in association with the molding mold 40.

Hereinafter, the outline of the process of manufacturing the molded product by the molding die 40 will be described with reference to FIGS. 4 to 5.

First, as shown in FIG. 4, a state in which the first mold 41 and the second mold 42 are heated to a predetermined temperature (for example, 50 ° C.) by temperature adjustment using the temperature adjusting unit 91 of the molding apparatus 200. To 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 at an appropriate position between the first and second molds 41 and 42, and both molds 41 and 42 are clamped. The state is assumed to be. Here, the reinforcing member 32 is close to the transfer surface PS of both molds 41 and 42, but has a clearance between both molds 41 and 42. That is, the reinforcing member 32 is only positioned in the cavity CV by being sandwiched between the holding parts 8a and 9a of both molds 41 and 42, and the reinforcing member 32 is hardly deformed without receiving a large stress. Next, as shown in FIG. 6, the resin RM in a state of being heated to a predetermined temperature (for example, 250 ° C.) and melted is injected into the cavity CV via the sprue portion SP or the like. The resin RM flows in the cavity CV and spreads 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 injected resin RM on the surface of the reinforcing member 32 on the injection port 61d side and the area in contact with the injected resin RM on the surface on the counter-entrance side below the reinforcing member 32 are approximately the same. Are equal. Further, since the through hole 32d 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 32d to form the reinforcing member 32. It quickly moves to the second mold 42 side, which is the back side, and the filling of the cavity CV is ensured. The molding die 40 is set to a target temperature as a whole by temperature adjustment using the temperature adjusting unit 91 during and after the injection of the resin RM, and is cooled by heat dissipation in the molding die 40 after the injection of the resin RM is completed. The resin RM is rapidly solidified to form the molded product MP. After that, although not shown, the movable second mold 42 is released, and the molded product MP is taken out as the resin housing portion 19 by an ejector pin or the like (not shown).

The reinforcing member 32 may have a warp generated in the manufacturing stage thereof. Therefore, a clearance is required between the reinforcing member 32 and both molds 41 and 42 to absorb the warp of the reinforcing member 32, and the resin pressure applied to the reinforcing member 32 is on the fixed side and the movable side. It is necessary not to make a big difference in. In the manufacturing method or molding method of the present embodiment, the holding parts 8a and 9a of the reinforcing member 32 secure a clearance for absorbing the warp of the reinforcing member 32 while blocking the movement of the reinforcing member 32. Further, in the present embodiment, the through hole 32d formed in the reinforcing member 32 prevents the occurrence of a state in which the resin pressure is significantly different on the front and back sides 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 the reinforcing member 32 is not warped due to the resin pressure biased during the molding process. 13 It is possible to suppress the change in the posture of the mounting surface 19f of other optical components.

According to the manufacturing method of the present embodiment, the cavity CV in which the resin forming the resin housing portion 19 is melted while the reinforcing member 32 is held in advance in the cavity CV of the molding mold forming the resin housing portion 19. By injecting into the inside, a resin housing portion 19 in which the reinforcing member 32 and the resin material are integrated is obtained, so that the resin is joined to the reinforcing member while in the molten state, and the joint portion is matched with the warp of the reinforcing member 32. Resin shape is formed. Therefore, even when the reinforcing member 32 is warped, a non-contact area is not generated between the reinforcing member 32 and the resin housing portion 19, and so-called chattering 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 formed at the same time as joining with the reinforcing member 32, it is not affected by the warp of the reinforcing member 32.

Although the present invention has been described above according to the embodiment, the present invention is not limited to the above embodiment. For example, the contour of the reinforcing member 32 is not limited to a rectangle as shown in the figure, but may be a circular shape or an appropriate shape that matches the contour of the deflector 13. Further, the thickness of the reinforcing member 32 can be appropriately modified according to the thickness of the resin housing portion 19, the weight of the deflector 13, and the like.

The number and arrangement of the protrusions 31d or the support-side fixing portions 35 formed on the first support portion 19c can also 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 shown in the drawing, and may not match the arrangement of the protrusion 31d or the support side fixing portion 35.

The structure of the molding die 40 is not limited to the one shown in the figure such as sprue, runner shape, position, and number of injection ports.

The arrangement of parts in the optical scanning device 10, the shape of the resin housing portion 19, and the shape of the connection portion with the reinforcing member 32 are not limited to those shown in the drawings.

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 multifaceted 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 part, 19f ... Mounting surface, 21a, 21b, 21c, 21d ... Image carrier (photoreceptor), 24 ... Optical parts, 31a ... Outer resin part, 31b ... Inner resin part, 31d ... Projection part, 31k ... Plate-shaped part, 32 ... Reinforcing member, 32d ... Through hole, 35 ... Support side fixing part, 135 ... Element side fixing part, 40 ... Molding mold, 41 ... First mold, 41 ... Second mold, 61, 71 ... Mold plate, 61d ... Injection port, 61h, 71h ... Through hole, 64,74 ... Receiving plate, 91 ... Temperature control device, 100 ... Image forming device, 200 ... Molding device, CV ... Cavity, MP ... Molded product, PS ... Transfer surface, RM ... Resin, SP ... Sprue part, SS ... Mold surface

Claims (10)

An optical unit that has a light source, a deflector, a scanning lens, and a mirror and enables scanning of light rays on an image carrier.
A method for manufacturing an optical scanning apparatus including a resin housing portion that holds the optical portion.
A reinforcing member is arranged at least in the support portion to which the deflector is attached in the resin housing portion.
With the reinforcing member held in advance in the cavity of the molding mold forming the resin housing portion, the resin forming the resin housing portion is injected into the cavity in a molten state to form the reinforcing member. A method for manufacturing an optical scanning apparatus, which comprises obtaining the resin housing portion in which a resin material is integrated. The method for manufacturing an optical scanning device according to claim 1, wherein the molding die has a holding component that supports the reinforcing member in the cavity. The molding molds are a first and second mold forming at least a part of the cavity, and a third and a fourth mold supporting the first mold and the second mold on the opposite side of the cavity, respectively. Including mold
The holding component arranged so as to penetrate the first mold and contact the third mold, and the holding component arranged so as to penetrate the second mold and contact the fourth mold. The method for manufacturing an optical scanning apparatus according to claim 1, wherein the optical scanning apparatus has. The method for manufacturing an optical scanning apparatus according to claim 3, wherein at least one of the holding parts has an elastic body at a portion in contact with the third or fourth mold. When 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 while the reinforcing member is held in the cavity. The optics according to any one of claims 1 to 4, further comprising at least one through hole for guiding the reinforcing member onto a surface opposite to the injection port side surface. Manufacturing method of scanning device. The area of the reinforcing member in contact with the injected resin on the surface on the injection port side and the area of the reinforcing member in contact with the injected resin on the surface opposite to the injection port are substantially equal. The method for manufacturing an optical scanning apparatus according to any one of claims 5. An optical unit that has a light source, a deflector, a scanning lens, and a mirror and enables scanning of light rays on an image carrier.
An optical scanning device including a resin housing portion that holds the optical portion.
A reinforcing member is integrally molded at least in the support portion to which the deflector is attached in the resin housing portion.
The deflector is an optical scanning device characterized in that the deflector is fixed to the reinforcing member of the supporting portion via a supporting side fixing portion formed of a 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 of the resin forming the support-side fixing portion is Tm2. Tm2
The optical scanning apparatus according to claim 7, wherein the above is true. The coefficient of linear expansion of the reinforcing member is α, the coefficient of linear expansion of the resin forming the resin housing portion is α1, and the coefficient of linear expansion of the resin forming the support-side fixing portion is α2. <Α1 and α <α2
The optical scanning apparatus according to any one of claims 7 and 8, wherein The optical scanning apparatus according to any one of claims 7 to 9, wherein the reinforcing member extends in a range that covers the outer shape of the deflector in a plan view.

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