JPH10250150A - Optical scan apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stable-quality optical scan apparatus which can form images of higher quality, by connecting an image formation optical system and an optical housing precisely. SOLUTION: A fixing projecting part 16 is provided at an image formation optical system 6. A recessed part 17 comparatively large enough to the projecting part 16 of the image formation optical system 6 is formed at an optical housing 11. The projecting part 16 is inserted in the recessed part 17 and the image formation optical system 6 is held by a hand 18 of a robot. An optical characteristic-measuring sensor 19 is set at an optical scan position of a photosensitive body 8, thereby measuring important optical characteristics, e.g. a shape of laser beams, a scan position by a laser light on the photosensitive body and the like. A position of the image formation optical system 6 is moved and adjusted by the robot to obtain proper characteristic values. After the adjustment is completed, an adhesive 15 is injected and set in the recessed part 17 of the optical housing 11, so that the image formation optical system 6 and the optical housing 11 are fixed by the adhesive 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical scanning device such as a laser beam printer (LBP) or a digital copying machine having an electrophotographic process in which an image is formed by repeatedly deflecting a light beam at a constant angle. .

[0002]

2. Description of the Related Art In an optical scanning apparatus such as an LBP, a light beam emitted from a light source means is conventionally modulated in accordance with an image signal, and this modulated light beam is periodically modulated by an optical deflector comprising a polygon mirror. Then, the deflected light beam is condensed into a spot on a photosensitive recording medium surface by an imaging optical system having fθ characteristics to form an image.

FIG. 24 is a schematic view of a conventional scanning optical system.
The divergent light beam emitted from the light source 1 is converted into a parallel light beam by a collimator lens 2 in the emission direction, and a beam light cross-sectional shape is formed by a stop 3 on the optical axis, and is incident on a cylindrical lens 4. The cylindrical lens 4 has a refractive power only in the sub-scanning direction, and the incident light beam is focused on the main scanning surface and forms an almost linear image on the reflection surface of the optical deflector 5 composed of a polygon mirror. The light beam reflected and deflected by the reflection surface of the light deflector 5 is condensed on the photoreceptor 8 through an imaging optical system 6 having fθ characteristics and a reflection mirror 7 that reflects the light beam and changes the optical path, thereby forming an image. To form In order to solve an error in the main scanning direction due to an angle error of the polygon mirror or the like, a light beam in a predetermined direction on a main scanning line is incident on a synchronization detection device 10 which outputs a synchronization signal via a lens 9 immediately before the start of modulation. The control device controls the operation of each unit so as to start the image signal with a predetermined time delay from the synchronization signal.

The above optical components are arranged on an optical housing 11 to form an optical unit. FIG. 25 shows FIG.
26 is a side view, the method of mounting the imaging optical system 6 on the optical housing 11 is as follows. As shown in FIG. Mounting reference surface 12 with spring 13 and screw 14
27, and the image forming optical system 6 is directly attached to the optical housing 11 by the adhesive 15 as shown in FIG.
Is generally used.

[0005]

When the above-described optical scanning device is incorporated in an apparatus such as an LBP digital copying machine or the like, in order to obtain a high-quality image, it is necessary to adjust the position of optical components in the optical scanning device. It is necessary to regulate strictly such as inclination. For this reason, conventionally, the accuracy of the mounting portion of the optical component and the optical housing has been increased to cope with the problem. However, there is a limit in increasing the accuracy, and there is a disadvantage that the cost is increased.

In recent years, optical parts and optical housings are made by molding plastics. However, molds of molding equipment become expensive due to high precision, and precision variations of molded products due to seasons occur. However, there is a drawback that the mold is difficult to manage because the wear is gradually deteriorated and the accuracy is lowered. After adjusting the height and angle of the optical component, there is also a method of bonding and fixing, but displacement of the adhesive due to shrinkage during curing,
There is an effect on distortion to optical components. Furthermore, the expansion coefficient differs due to the difference in the material of the optical component and the optical housing, and when subjected to a temperature cycle or heat shock, stress distortion occurs due to expansion of the optical component, and the optical characteristics are deteriorated. Further, if the bonding area is reduced in order to reduce these effects, the bonding strength decreases and reliability becomes a problem.

An object of the present invention is to solve the above-mentioned problems and to provide an optical scanning device capable of forming a higher-quality image and having stable quality.

[0008]

According to a first aspect of the present invention, there is provided a deflecting means for repetitively deflecting a light beam modulated by an image signal by a predetermined angle to perform a main scan on an image forming surface, and to deflect the light beam into the image. An optical member for forming an image on a forming surface, a housing for accommodating the optical member and the deflecting means, and a synchronization signal for detecting the light beam immediately before the start of modulation deflected by the deflecting means and for starting the modulation In the optical scanning device provided with a synchronization detecting device that outputs the optical member, a fixing convex portion is provided on the optical member, a sufficiently large concave portion is provided on the housing as compared with the convex portion of the optical member, and the position of the optical member is After performing the adjustment, the convex portion of the optical member and the concave portion of the housing are fixed with an adhesive,
Therefore, the accuracy of the mounting part of the optical housing can be made rough, and the cost of parts can be reduced. Also, when making the optical housing by molding, the accuracy of the mold of the molding equipment may be rough, and the seasonal molding This eliminates the need to worry about the effects of variations in product accuracy, and significantly reduces the accuracy control of the mold. In addition, a convex portion is provided in the image forming optical system, and the convex portion is bonded and fixed, so that the influence of distortion on a portion for creating optical characteristics of the optical component is hardly generated, and a large bonding area is taken. And a strong adhesive strength can be obtained.

According to a second aspect of the present invention, in the first aspect of the present invention, the optical member is provided with a plurality of fixing projections, and the projections of the projections are provided with lateral grooves. In the case where two projections are provided on the imaging optical system and the projections are bonded and fixed, component distortion due to temperature due to a difference in expansion coefficient of the imaging optical system housing is reduced in the lateral direction provided on the projections of the projections. The optical part of the optical component is restrained from being distorted.

According to a third aspect of the present invention, in the first aspect of the present invention, the shape of the fixing convex portion of the optical member and the shape of the concave portion of the housing are concentric cylindrical shapes. It is characterized in that it is formed in a shape into which the portion enters, and thus, by making the portions to be bonded and fixed of the convex portion and the concave portion concentrically cylindrical, the surface area of the bonded portion is increased and the bonding strength is increased.

According to a fourth aspect of the present invention, in the first aspect of the present invention, the shape of the fixing projection of the optical member is a large number of needle-like projections. By making the part to be made into a needle-like projection shape, misalignment due to shrinkage during curing of the adhesive can be dispersed and absorbed by many needle-like parts and reduced, and the surface area of the bonding part is large, The strength is increased.

According to a fifth aspect of the present invention, in the first aspect of the present invention, the shape of the fixing projection of the optical member is a large number of needle-like projections, and the shape of the concave portion of the concave portion of the housing is a large number. The protrusions and recesses are formed into a shape into which the needle-like protrusions are inserted, so that the protrusions and the recesses are formed into needle-like protrusions that are bonded and fixed to each other. In, the position shift due to shrinkage during curing of the adhesive is absorbed and dispersed by the needle-like portions of each other, so that it can be reduced, and the surface area of the bonding portion is very large,
Very strong adhesive strength can be obtained.

According to a sixth aspect of the present invention, in the first aspect of the invention, clay, sand, ceramic powder, or glass powder is placed in the recess of the housing, and the optical member is made of the clay, sand, or ceramic powder. Or, after inserting into a concave portion of the housing containing the glass powder and performing optical position adjustment, the upper portion of the convex portion of the optical member and the periphery of the concave portion of the housing are fixed with an adhesive, The position of the convex portion and the concave portion to be bonded and fixed is concentrated on the root of the convex portion to reduce the volume of the adhesive, thereby reducing the displacement due to shrinkage during curing of the adhesive.

According to a seventh aspect of the present invention, in the first aspect of the present invention, metal, stone, ceramic, or glass having a spherical or fine particle size is placed in the recess of the housing, and the optical member is formed into the spherical or fine particle shape. Metal, or stone, or ceramic, or inserted into the recess of the housing containing the glass, after performing the optical position adjustment, characterized in that it is fixed by injecting and penetrating an adhesive into the recess of the housing, Therefore, spherical or fine-grained metal, stone, ceramic, or glass is put in the gap between the convex and concave portions, and the convex and concave portions are contact-supported with a solid substance other than the adhesive, and the whole is solidified with the adhesive. This reduces the amount of misalignment due to shrinkage during curing of the adhesive. It is those that make it harder to generate.

According to an eighth aspect of the present invention, in the first aspect of the present invention, when the convex portion of the optical member and the concave portion of the housing are fixed with an adhesive, the adhesive is formed so as to form a layer of several millimeters in the concave portion. After adding and solidifying, the next few millimeters of adhesive are added and further solidified, and the parts are fixed in the order of the thinner layer from the bottom to fix the parts, and the parts are fixed. By curing the adhesive in order to form a layer of millimeters, the amount of shrinkage at the time of curing the adhesive which occurs at once is minimized, and after the shrinkage reaction at the time of curing is completed, the adhesive is added By curing, high-precision bonding with little displacement can be performed.

According to a ninth aspect of the present invention, in the first aspect of the present invention, when the convex portion of the optical member and the concave portion of the housing are fixed with an adhesive, the adhesive is an ultraviolet curable adhesive, and the adhesive is a concave portion. After the injection into the concave portion, it is characterized by irradiating an ultraviolet beam so as to solidify concentrically in order from the periphery of the concave portion, curing the adhesive so as to form a thin layer, and fixing the component. By curing the adhesive in order so as to form a concentric layer, the chemical reaction of the adhesive causes the adhesive to react, and the reaction proceeds from the outer periphery with a large volume to adjust the imaging optics. The bonding method for controlling the convex portion of the system to be finally cured is to minimize the displacement of components and to perform bonding without being affected by internal stress due to contraction of the solvent.

According to a tenth aspect of the present invention, in the first aspect of the present invention, when the convex portion of the optical member and the concave portion of the housing are fixed with an adhesive, the adhesive is an ultraviolet-curable adhesive;
After injecting the adhesive into the recess, the recess is once irradiated with an ultraviolet beam to start curing, and the position of the ultraviolet beam is moved to a location where the deformation due to curing shrinkage is corrected while continuously measuring the position of the part, and bonding is performed. It is characterized by hardening the agent and fixing the part at the measurement position, and by curing the adhesive while monitoring the position of the part, the positional deviation due to shrinkage during curing of the adhesive is eliminated. .

According to an eleventh aspect of the present invention, in the first aspect of the invention, when the convex portion of the optical member and the concave portion of the housing are fixed with an adhesive, the adhesive is an ultraviolet-curable adhesive;
After injecting the adhesive into the recess, irradiating with an ultraviolet beam and curing once, measuring the position of the part, dropping an appropriate amount of adhesive again at the position to correct the misalignment due to curing shrinkage, and then applying the ultraviolet beam It is characterized by irradiating, curing the adhesive, and fixing the parts at the specified position.After bonding and fixing the parts once, the position of the parts is measured, and additional bonding is performed to correct the deformed position during curing Is performed to reduce the displacement.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION

FIG. 1 is a schematic view of an optical scanning device according to an embodiment of the present invention as viewed from the side. The image forming optical system 6 has a fixing projection 16 and an optical housing 11. Has a concave portion 17 which is sufficiently larger than the convex portion 16 of the imaging optical system 6. The imaging optical system 6 is gripped by the robot hand 18.
An optical characteristic measuring sensor 19 is installed at the optical scanning position of the photoconductor 8 to measure important optical characteristics such as the beam shape of the laser beam and the scanning position of the laser beam on the photoconductor 8, and the characteristic value is adjusted to an appropriate value. The position of the imaging optical system 6 is adjusted by moving the position of the imaging optical system 6 by a robot.

After the adjustment is completed, the concave portion 1 of the optical housing 11 is
An adhesive 15 is injected into the resin 7 and cured, and the imaging optical system 6 and the optical housing 11 are fixed with the adhesive.

FIGS. 2 and 3 are cross-sectional views of the imaging optical system 6 of FIG. 1 viewed from the vertical direction. FIG. 2A shows a configuration in which one projection 16 is provided at the center of the imaging optical system 6. Recess 17 of optical housing 11
FIG. 3 shows an embodiment in which two sets of the convex portion 16 of the imaging optical system 6 and the concave portion 17 of the optical housing 11 are provided and fixed by the adhesive 15. 2 (B) and 2 (C) are enlarged views for explaining a modification of the portion S in FIG. 2 (A).

In the conventional method, the precision of the components of the optical component and the mounting portion of the optical housing is increased and pressed with a spring or the adhesive layer is made as thin as possible to maintain the precision. There is a drawback in that there is a limit to increase the cost and the cost is high. In particular, molds of molding equipment for producing high-precision parts become expensive due to high precision, precision variations of molded products occur due to seasons, and wear deteriorates gradually and precision deteriorates, so mold management is difficult. There are disadvantages such as there.

In the present invention, since the optical characteristics are measured and adjusted so that the characteristic values are at appropriate positions, it is not necessary to make the optical component mounting surface of the optical housing or the optical component mounting surface highly accurate. There is also a method of adjusting the height and angle of the optical components and then bonding and fixing them. However, in the conventional bonding, since the lower part of the lens surface that determines the optical characteristics is directly bonded, the bonding surface is wide or two or more positions are bonded. However, if the distance between the bonding positions is large, there is a disadvantage that the length of the component changes with temperature due to the difference in the expansion coefficient between the optical component and the material of the optical housing, stress distortion occurs, and the optical characteristics deteriorate. Was.

In the present invention, even if stress distortion due to expansion occurs in the optical component, it is absorbed by the convex portion, so that the structure is less affected by the stress distortion up to the lens portion that produces optical characteristics. Therefore, the optical characteristics do not change even when subjected to a temperature cycle or a heat shock. In addition, since the concave portion of the optical housing and the convex portion of the image forming optical system are fixed with an adhesive, a three-dimensionally three-dimensionally bonded surface is formed, so that the bonding holding force is stabilized. Further, S in FIG.
The portion is, as shown in FIG. 2B, a convex portion 1 of the imaging optical system 6.
By providing a groove 16a in 6 or forming the convex portion 16 of the imaging optical system 6 into a conical shape with a larger lower portion as shown in FIG. 2C, the adhesive strength against an external force is increased.

FIGS. 4 and 5 are cross-sectional views of a main part of the embodiment of the second aspect of the present invention viewed from the vertical direction. In the embodiment shown in FIG. 3 in which two sets of concave portions 17 are provided and bonded and fixed,
A lateral groove 20 is provided at the base of the projection of the fixing projection 16 of the imaging optical system 6. The embodiment shown in FIG. 4 is an embodiment in which one lateral groove 20 is provided in the projection of one of the two projections 16 of the imaging optical system 6 in FIG. 3, and the embodiment shown in FIG. This is an embodiment in which a lateral groove 20 is provided in each of the projections of the two projections 16 of the imaging optical system 6 in FIG. As shown in FIG. 3, when two convex portions provided on the imaging optical system are bonded, the distance between the bonding positions may be longer due to a difference in expansion coefficient between the materials of the optical component 6 and the optical housing 11. It changes with temperature, causing stress distortion. Since the optical housing is larger and has a higher rigidity than the imaging optical system, all of the stress and strain is applied to the projection 16 of the imaging optical system, and the pitch of the projection is increased each time a temperature change occurs. Or narrowing stress is generated, and distortion is exerted on a lens portion for creating optical characteristics.

In the present invention, a lateral groove 20 is provided at the boundary between the lens surface of the projection of the projection 16 of the imaging optical system 6 and the projection, and the portion of the groove 20 is Since the strength is inferior to the other parts, when stress distortion occurs due to expansion of the optical component, the structure becomes a structure that actively absorbs stress around the groove. By receiving the stress in this groove, a structure that does not reach the lens surface of the imaging optical system can be configured,
The optical characteristics are less affected by thermal expansion than in the first aspect.

FIG. 6 is a side view and a bottom view of the imaging optical system 6 according to an embodiment of the present invention. 7 and 8 show these imaging optical systems 6 connected to the housing 1.
FIG. 1 is a sectional view of an embodiment of the present invention, wherein the shape of the projection 21 of the imaging optical system 6 and the shape of the recess 22 of the optical housing 11 are concentric cylindrical shapes. The projections 21 and the recesses 22 of the optical housing 11 have cylindrical projections which are inserted and combined. FIG. 6 shows an example in which one set of concentric cylindrical protrusions 21 is provided at the center of the imaging optical system 6. FIG.
FIG. 7A shows an embodiment in which one set of a concentric cylindrical convex portion 21 of the imaging optical system 6 and a concentric cylindrical concave portion 22 of the optical housing 11 are provided and bonded and fixed. 21, the bonding portion of the concave portion 22 is shown in an enlarged manner. FIG. 8 shows the imaging optical system 6.
In this embodiment, two sets of concentric cylindrical convex portions 21 and two concentric cylindrical concave portions 22 of the optical housing 11 are provided and fixed. According to the present invention, the surface areas of the optical housing bonding portion and the imaging optical system bonding portion are increased compared to the first aspect of the present invention by making the portions where the convex portions and the concave portions are bonded and fixed have concentric cylindrical shapes. And the bonding strength becomes stronger.

(Invention of Claim 4) FIG. 9 is a side view and a bottom view showing the imaging optical system 6 of the invention of claim 4, and FIG.
FIG. 11 shows a cross-sectional view of the case in which the housing 11 is attached. The shape of the projection 23 of the imaging optical system 6 is made into a large number of needle-like projections, and the shape of the recess 17 of the optical housing 11 is made into a shape into which the needle-like projection of the projection 23 of the imaging optical system 6 enters. . FIG. 9 shows an example in which one set of a large number of needle-like projections of the projection 23 is provided at the center of the imaging optical system 6. FIG.
(B) shows an enlarged view of a large number of needle-like projections of the projection 23. FIG. 10 is a view showing an embodiment in which one set of the projection 23 of the imaging optical system 6 and the recess 17 of the optical housing 11 are provided and bonded and fixed. FIG. FIG.

FIG. 11 is a view showing an embodiment in which two sets of the convex portion 23 of the imaging optical system 6 and the concave portion 17 of the optical housing 11 are provided and bonded and fixed. This is done by holding the part after a chemical reaction and hardening. When the adhesive cures, a volume change occurs due to internal stress due to the shrinkage of the solvent, and a component displacement occurs. The present invention prevents the concentration of stress by dispersing and absorbing internal stress due to shrinkage during curing of the adhesive by forming a needle-shaped projection at the portion of the convex portion to be bonded and fixed, thereby dispersing and absorbing the stress. ,
Reduce component displacement. Further, the surface area of the bonding portion is large due to the needle-like projection shape, and the bonding strength is higher than that of the first aspect.

(Invention of Claim 5) FIGS. 12 and 13 are cross-sectional views of the invention of claim 5, wherein the projections 23 of the imaging optical system 6 are formed into a large number of needle-like projections. The shape of the concave portion 24 of the housing 11 is also a large number of needle-like protrusions,
The convex portion 23 of the imaging optical system 6 and the concave portion 2 of the optical housing 11
No. 4 has a shape in which the needle-like projections of each other enter and combine. FIG. 12A shows an example in which one set of a large number of projections is provided in the projection 23 of the imaging optical system 6 and the recess 24 of the optical housing 11. FIG. 12B shows the example of the projection 23 and the recess 24. An enlarged view of the bonded portion in which the needle-like protrusions are combined with each other is shown. FIG. 13 shows a projection 23 of the imaging optical system 6,
This is an embodiment in which two sets of concave portions 24 of the optical housing 11 are provided and fixed.

According to the present invention, the portions to be bonded and fixed of the convex portion and the concave portion are formed in a needle-like projection shape, so that the internal stress due to shrinkage at the time of curing the adhesive can be more powerfully compared with the invention of claim 4. Since the components can be dispersed and absorbed and the amount of the adhesive is small, the displacement of components can be greatly reduced. In addition, the surface area of the needle-shaped protrusion-shaped bonding portion is larger than that of the invention of claim 4, and the bonding strength is further increased.

(Invention of Claim 6) FIGS. 14 and 15 are sectional views for explaining an embodiment of the invention of claim 6, and FIG.
As shown in FIG. 4A, when the convex portion 16 of the imaging optical system 6 and the concave portion 17 of the optical housing 11 are bonded and fixed, clay, sand, ceramic powder, or glass powder 25 is formed in the concave portion 17 of the optical housing 11. Is inserted in advance, and the convex portion 16 of the imaging optical system 6 is made of a housing 1 containing clay, sand, ceramic powder, or glass powder 25.
After adjusting the optical position by inserting it into the concave portion 17, clay or sand is placed on the upper portion of the concave portion 17 of the optical housing 11.
An adhesive 15 is dropped so as to cover the entirety of the ceramic powder and the glass powder 25 so as to cover the whole, and the upper portion of the convex portion 16 of the imaging optical system 6 and the periphery of the concave portion of the optical housing 11 are fixed with the adhesive 15. FIG. 14A shows an embodiment in which one set of the convex portion 16 of the imaging optical system 6 and the concave portion 17 of the optical housing 11 are provided and bonded, and FIG. 14B shows an enlarged bonded portion. FIG.
The convex portion 16 of the imaging optical system 6 and the concave portion 1 of the optical housing 11
This is an embodiment in which two sets 7 are provided and bonded and fixed.

According to the present invention, the portions to be bonded and fixed of the convex portions and the concave portions are concentrated on the roots of the convex portions, the volume of the adhesive is reduced, and the volume change due to the internal stress due to the contraction of the solvent is reduced.
The displacement due to shrinkage during curing of the adhesive can be reduced. Since the tip of the projection enters clay, sand, ceramic powder, and glass powder and is pressed down, the displacement is small as compared with the first aspect of the invention.

FIGS. 16 and 17 are cross-sectional views for explaining an embodiment of the present invention.
6, when the convex portion 16 of the imaging optical system 6 and the concave portion 17 of the optical housing 11 are bonded and fixed, metal or stone, ceramic, or ceramic having a spherical or fine particle diameter is formed in the concave portion 17 of the optical housing 11. The glass 26 is inserted in advance, and the convex portion 16 of the imaging optical system 6 is inserted into the concave portion 17 of the housing containing the metal, stone, ceramic, or glass 26 having a spherical or fine particle diameter, and the optical position is adjusted. After that, the adhesive 15 is injected into and penetrates a metal, stone, ceramic, or glass 26 having a spherical or fine particle diameter in the concave portion 17 of the optical housing 11, and the convex portion 16 of the imaging optical system 6, the optical housing 11. Of the metal, stone, ceramic, or glass 26 of the concave portion, spherical shape or fine particle size, is fixed with the adhesive 15. That. FIG. 16A shows the image forming optical system 6.
FIG. 16B shows an enlarged view of the bonding portion in an embodiment in which one set of the convex portion 16 and the concave portion 17 of the optical housing 11 are provided. FIG. 17 shows the projection 16 of the imaging optical system 6 and the optical housing 11.
This is an embodiment in which two sets of concave portions 17 are provided and bonded and fixed.

According to the present invention, a metal, stone, ceramic powder, glass or the like having a small particle diameter is mixed with an adhesive to reduce the volume of the adhesive, reduce the volume change due to internal stress due to shrinkage of the solvent, and bond the adhesive. This is to reduce the displacement caused by shrinkage during curing of the agent.

(Embodiment 8) FIG. 18 is a cross-sectional view for explaining an embodiment of the invention according to the eighth embodiment.
When the convex portion 16 and the concave portion 17 of the optical housing 11 are provided and fixed by bonding, when the convex portion and the concave portion are fixed with an adhesive, an adhesive is injected and solidified so as to form a layer of several millimeters in the concave portion 17. After that, the next few millimeters of glue are injected and solidified, and a few millimeters of thin layer 27 from the bottom to secure the part.
The adhesive is cured in order so as to form and the parts are fixed. FIG. 19 shows an enlarged view of the bonding portion in this bonding procedure. The adhesive is cured by a chemical reaction, but it is difficult to control how the reaction proceeds and the amount of internal stress generated due to shrinkage of the solvent during curing. Therefore, when a large amount of adhesive is cured at a time, internal stress due to shrinkage is concentrated, and a large displacement may occur.

According to the present invention, the adhesive to be cured is divided into a volume to be originally bonded, the amount of shrinkage at the time of curing the adhesive which is generated at one time is reduced as much as possible, and after the shrinkage reaction at the time of curing is completed, the adhesive is cured. Add and cure. By repeating this, high-precision bonding with little displacement is performed.

FIG. 20A is a cross-sectional view for explaining an embodiment of the ninth aspect of the present invention.
(B) is an enlarged view of the bonding portion, and the projection 1 is formed on the imaging optical system 6.
6. In the case where the optical housing 11 is provided with the concave portion 17 and fixed by bonding, the adhesive 29 is an ultraviolet-curable adhesive, the adhesive 29 is injected into the concave portion 17 and the imaging optical system 6 is adjusted. Then, an ultraviolet beam is irradiated by the fiber 28 so as to solidify in order from concentric circles, and the adhesive 29 is cured so as to form a thin concentric layer from the outer periphery, thereby fixing the component. FIG. 21 shows this bonding procedure in an enlarged manner.

According to the present invention, the reaction position of the adhesive which is cured by the chemical reaction of the adhesive is set such that the reaction proceeds from the outer periphery having a large volume so that the adjusted convex portion of the imaging optical system is finally cured. By controlling, the bonding is performed so that the generation of internal stress due to the contraction of the solvent does not affect the displacement.

(Invention of Claim 10) FIG.
FIG. 4 is a cross-sectional view for explaining an embodiment of the present invention, wherein the projections 16 are formed in the imaging optical system 6 and the depressions 17 are formed in the optical housing 11, and the adhesive 30 is used as an ultraviolet-curable adhesive; An adhesive is injected into the concave portion 17 and the imaging optical system 6 is formed.
After the adjustment, the adhesive 30 is cured by irradiating an ultraviolet beam from the outer periphery of the concave portion 17 with the fiber 28. At that time,
Deformation due to curing shrinkage is measured while continuously monitoring the position of the component, the irradiation position of the ultraviolet beam is moved to a position where the deformation is corrected, the adhesive of the recess 17 is sequentially cured, and the component is fixed at the measurement position.

As shown in FIG. 22A, while monitoring the position of the component, the right side of the concave portion 17 is first irradiated with an ultraviolet beam to cure the adhesive 30a. As shown in FIG. 22 (B), the fiber 28 is moved at the diagonal and irradiated to cure the adhesive 30b. Thereafter, the periphery of the concave portion 17 is sequentially cured. Alternatively, the four corners of the outer periphery of the concave portion 17 are cured diagonally, and the irradiation area to be solidified is controlled according to the amount of deformation due to curing shrinkage, and bonding is performed to control the deformation. After that, the fiber 28 is irradiated with an ultraviolet beam so as to increase the octagon and the entire outer circumference so that the entire recess 17 is solidified in order.

According to the present invention, by gradually curing the adhesive while monitoring the position of the component, the adhesive is cured so that the displacement caused by shrinkage during curing of the adhesive is minimized.

(Invention of Claim 11) FIG.
FIG. 1 is a cross-sectional view for explaining an embodiment of the present invention. In the case where a convex portion 16 is formed on an imaging optical system 6 and a concave portion 17 is formed on an optical housing 11 and bonded and fixed, an adhesive 31 is an ultraviolet curable adhesive, As shown in FIG. 23 (A), the adhesive is injected into the concave portion 17 for about 5 minutes, and after adjusting the imaging optical system 6, an ultraviolet beam is irradiated from the outer periphery of the concave portion 17 with the fiber 28, thereby forming the adhesive 31a. Is cured to fix the imaging optical system 6 to the optical housing 11. Then, after measuring the position of the component and measuring the deformation due to the curing shrinkage, as shown in FIG. 23 (A), an appropriate amount of the adhesive 31b is again dropped on the concave portion 17 at the position where the deformation is corrected. Then, an ultraviolet beam is immediately radiated, cured, and additionally bonded and fixed so that the position of the component is corrected.

That is, the first bonding is for fixing parts, and the second bonding is for correcting a position deformed by the first bonding. In FIG. 23, the adhesive is injected into the concave portion 17 for about 5 minutes, the first adhesive 31a is hardened, the component is fixed, the position of the component is measured, and the position deformed by the first bonding is corrected. The adhesive 31b is additionally dropped and cured. According to the present invention, it is possible to reduce the displacement by measuring the position of the component after bonding and fixing the component once, and further performing additional bonding so as to correct the position deformed during curing.

[0045]

According to the first aspect of the present invention, there is provided a deflecting means for repetitively deflecting a light beam modulated by an image signal at a fixed angle to perform main scanning on an image forming surface, and connecting the light beam to the image forming surface. An optical member for imaging, a housing accommodating the optical member and the deflecting means, and a synchronization for detecting the light beam immediately before the start of modulation deflected by the deflecting means and outputting a synchronization signal for starting the modulation. In an optical scanning device provided with a detection device, the optical member was provided with a fixing convex portion, the housing was provided with a sufficiently large concave portion as compared with the convex portion of the optical member, and the position of the optical member was adjusted. Later, since the convex portion of the optical member and the concave portion of the housing are fixed with an adhesive, the accuracy of the mounting portion of the optical housing can be roughened, and the cost of parts can be reduced.
In addition, when making an optical housing by molding, the accuracy of the mold of the molding device may be rough, and there is no need to worry about the effects of seasonal variations in the accuracy of the molded product, and the accuracy control of the mold can be greatly reduced. . In addition, a convex portion is provided in the image forming optical system, and the convex portion is bonded and fixed, so that the influence of distortion on a portion for creating optical characteristics of the optical component is hardly generated, and a large bonding area is taken. To be able to
Strong adhesive strength can be obtained.

According to a second aspect of the present invention, in the first aspect of the present invention, a plurality of fixing projections are provided on the optical member, and a horizontal groove is provided on the projection of the projection. When two projections are provided in the system and these projections are bonded and fixed, component distortion due to temperature due to a difference in expansion coefficient of the imaging optical system housing is absorbed by the lateral grooves provided in the projections of the projections. In addition, distortion of the optical part of the optical component can be suppressed.

According to a third aspect of the present invention, in the first aspect of the invention, the shape of the fixing projection of the optical member and the shape of the recess of the housing are concentric cylindrical shapes, and the projection of the projection and the recess are formed. Since the portion is formed into a shape into which the portion enters, the portion to be bonded and fixed between the convex portion and the concave portion is formed in a concentric cylindrical shape, so that the surface area of the bonded portion can be increased and the bonding strength can be increased.

According to a fourth aspect of the present invention, in the first aspect of the present invention, since the shape of the fixing projection of the optical member is formed into a large number of needle-like projections, the portion of the projection to be bonded and fixed is needle-like. With the projection shape, the misalignment due to shrinkage during curing of the adhesive can be dispersed and absorbed by a large number of needle-shaped portions, and can be reduced. In addition, the surface area of the bonded portion can be increased, and the bonding strength can be increased. .

According to a fifth aspect of the present invention, in the first aspect of the invention, the shape of the fixing projection of the optical member is a large number of needle-like projections, and the shape of the concave portion of the concave portion of the housing is a large number. The shape of the needle-shaped protrusions is such that the protrusions and recesses of the needle-like protrusions are inserted into the shape. Displacement due to shrinkage at the time can be absorbed and dispersed by the needle-like portions and can be reduced, and the surface area of the bonding portion is very large, so that a very strong bonding strength can be obtained.

According to a sixth aspect of the present invention, in the first aspect of the invention, clay, sand, ceramic powder, or glass powder is placed in the recess of the housing, and the optical member is made of the clay, sand, or ceramic powder. Alternatively, after inserting into the concave portion of the housing containing the glass powder and performing optical position adjustment, the upper portion of the convex portion of the optical member and the periphery of the concave portion of the housing are fixed with an adhesive. In addition, by concentrating the portion of the concave portion to be bonded and fixed at the root of the convex portion and reducing the volume of the adhesive, it is possible to reduce the displacement due to shrinkage during curing of the adhesive.

According to a seventh aspect of the present invention, in the first aspect of the invention, metal, stone, ceramic, or glass having a spherical or fine particle diameter is placed in the recess of the housing, and the optical member is formed into the spherical or fine particle diameter. Metal, or stone, or ceramic, or inserted into the recess of the housing containing the glass and after adjusting the optical position, so that the adhesive is injected into the recess of the housing, so that it was fixed by penetrating, Metal or stone, ceramic, or glass with a spherical or fine grain diameter is put in the gap between the convex and concave parts, and the solid and non-adhesive materials are used to support the convex and concave parts in contact, and the whole is hardened with adhesive. As a result, the displacement due to shrinkage during curing of the adhesive is reduced, and with this configuration, the amount of adhesive used is small, and shrinkage during curing hardly occurs. Rukoto can.

According to an eighth aspect of the present invention, in the first aspect of the present invention, when the convex portion of the optical member and the concave portion of the housing are fixed with an adhesive, the adhesive is formed so as to form a layer of several millimeters in the concave portion. After adding and solidifying, the adhesive of the next several millimeters was put in and further solidified, and the parts were fixed in order from the lower layer to fix the parts, and the parts were fixed. By curing the adhesive in order so as to form a layer, the amount of shrinkage at the time of curing the adhesive which occurs at one time is reduced as much as possible, and after the shrinkage reaction at the time of curing is completed, the adhesive is additionally cured. Thereby, high-precision bonding with little displacement can be performed.

According to a ninth aspect of the present invention, in the first aspect of the present invention, when the convex portion of the optical member and the concave portion of the housing are fixed with an adhesive, the adhesive is an ultraviolet curable adhesive, and the adhesive is a concave portion. After the injection, a UV beam was irradiated so as to solidify concentrically from the periphery of the recess, the adhesive was cured so as to form a thin layer, and the parts were fixed. By curing the adhesive in order so as to form a layer of the adhesive, the reaction position of the adhesive that is cured by the chemical reaction of the adhesive is advanced from the outer periphery having a large volume, and the adjusted optical system of the imaging optical system is adjusted. By controlling the convex portion to be finally cured, the displacement of the component can be suppressed as much as possible, and the bonding can be performed without being affected by the internal stress due to the contraction of the solvent.

According to a tenth aspect of the present invention, in the first aspect of the present invention, when the convex portion of the optical member and the concave portion of the housing are fixed with an adhesive, the adhesive is an ultraviolet-curable adhesive;
After injecting the adhesive into the recess, the recess is once irradiated with an ultraviolet beam to start curing, and the position of the ultraviolet beam is moved to a location where the deformation due to curing shrinkage is corrected while continuously measuring the position of the part, and bonding is performed. Since the component is fixed at the measurement position by curing the agent, the adhesive is cured while monitoring the position of the component, thereby eliminating positional displacement due to shrinkage during curing of the adhesive.

According to an eleventh aspect of the present invention, in the first aspect of the invention, when the convex portion of the optical member and the concave portion of the housing are fixed with an adhesive, the adhesive is an ultraviolet-curable adhesive;
After injecting the adhesive into the recess, irradiating with an ultraviolet beam and curing once, measuring the position of the part, dropping an appropriate amount of adhesive again at the position to correct the misalignment due to curing shrinkage, and then applying the ultraviolet beam Irradiation and curing of the adhesive to fix the part at the specified position.After bonding and fixing the part once, measure the position of the part and perform additional bonding so as to correct the deformed position at the time of curing This can reduce the displacement.

[Brief description of the drawings]

FIG. 1 is a schematic side view of a main part of an optical scanning device according to the present invention.

FIG. 2 is a configuration sectional view of a connection portion of the imaging optical system of the present invention.

FIG. 3 is a sectional view showing another configuration of a connection portion of the imaging optical system according to the present invention.

FIG. 4 is a cross-sectional view illustrating another configuration of the connection portion of the imaging optical system according to the present invention.

FIG. 5 is a cross-sectional view of another configuration of the connection portion of the imaging optical system of the present invention.

FIG. 6 is a side view and a bottom view showing an example of the image forming optical system according to claim 3;

FIG. 7 is a sectional view of an embodiment according to the third aspect of the present invention.

FIG. 8 is a sectional view showing another embodiment of the invention of claim 3;

FIG. 9 is a diagram showing an imaging optical system according to the invention of claim 4;

FIG. 10 is a sectional view of an embodiment of the invention according to claim 4;

FIG. 11 is a sectional view showing another embodiment of the invention of claim 4.

FIG. 12 is a sectional view showing an embodiment of the invention of claim 5;

FIG. 13 is a sectional view showing another embodiment of the invention of claim 5;

FIG. 14 is a sectional view showing an embodiment of the invention according to claim 6;

FIG. 15 is a sectional view showing another embodiment of the invention of claim 6;

FIG. 16 is a sectional view showing an embodiment of the invention of claim 7;

FIG. 17 is a sectional view showing another embodiment of the invention of claim 7;

FIG. 18 is a sectional view showing an embodiment of the invention of claim 8;

FIG. 19 is an enlarged view showing a bonding procedure of the bonding portion of FIG. 18.

FIG. 20 is a sectional view showing an embodiment of the invention of claim 9;

FIG. 21 is an enlarged view showing a bonding procedure of the bonding portion of FIG. 20.

FIG. 22 is a sectional view showing an embodiment of the tenth aspect of the present invention.

FIG. 23 is a sectional view showing an embodiment of the present invention.

FIG. 24 is a schematic perspective view of a main part of a conventional scanning optical system.

FIG. 25 is a side view of FIG. 24.

FIG. 26 is a configuration diagram of a mounting portion of a conventional imaging optical system.

FIG. 27 is a configuration diagram of another mounting portion of a conventional imaging optical system.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Light source, 2 ... Collimator lens, 3 ... Stop, 4 ... Cylindrical lens, 5 ... Optical deflector, 6 ... Imaging optical system, 7
... Reflection mirror, 8 ... Photoconductor, 9 ... Lens, 10 ... Synchronization detection device, 11 ... Optical housing, 12 ... Reference plane, 13 ...
Spring, 14 ... screw, 15 ... adhesive, 16 ... convex, 17 ...
Concave part, 18 ... Robot hand, 19 ... Optical property measurement sensor, 20 ... Groove, 21 ... Cylindrical convex part, 22 ... Cylindrical concave part, 23 ... Needle convex part of imaging optical system, 24 ... Needle concave part of optical housing , 25 ... clay or sand, ceramic powder,
Glass powder, 26: spherical or fine metal, or stone, or ceramic, or glass, 27: thin layer, 28: fiber, 29: adhesive, 30a, 30b
... adhesives, 31a, 31b ... adhesives.

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Toshiyuki Muto 1-3-6 Nakamagome, Ota-ku, Tokyo Inside Ricoh Company, Ltd.

Claims (11)

[Claims] 1. A deflecting means for repetitively deflecting a light beam modulated by an image signal by a predetermined angle to perform main scanning on an image forming surface, and an optical member for forming an image of the light beam on the image forming surface. A light housing comprising the optical member and the deflecting means, and a synchronization detecting device for detecting the light beam immediately before the start of modulation deflected by the deflecting means and outputting a synchronization signal for starting the modulation. In the scanning device, the optical member has a fixing convex portion, the housing has a sufficiently large concave portion as compared to the convex portion of the optical member, and the convex portion of the optical member and the concave portion of the housing are formed of an adhesive. An optical scanning device characterized by being fixed by: 2. The optical scanning device according to claim 1, wherein the optical member has a plurality of fixing projections, and the projections of the projections have lateral grooves. 3. The method according to claim 1, wherein the shape of the fixing convex portion of the optical member and the shape of the concave portion of the housing are concentric cylindrical shapes, and the convex portion and the concave portion are formed into a shape. 2. The optical scanning device according to 1. 4. The optical scanning device according to claim 1, wherein the fixing projection of the optical member has a large number of needle-like projections. 5. The fixing member of the optical member has a large number of needle-like protrusions, and the concave portion of the housing has a large number of needle-like protrusions. 2. The optical scanning device according to claim 1, wherein the needle-shaped projection is formed into a concave shape. 6. Putting clay, sand, ceramic powder, or glass powder into the recess of the housing,
After adjusting the optical position by inserting the convex portion of the optical member into the concave portion of the housing containing the clay, sand, ceramic powder, or glass powder, the upper portion of the convex portion of the optical member and the housing 2. The optical scanning device according to claim 1, wherein the periphery of the concave portion is fixed with an adhesive. 7. A spherical or fine-grained metal, stone, ceramic, or glass is placed in the recess of the housing, and the spherical or fine-grained metal, stone, or ceramic is formed on the projection of the optical member. 2. The optical scanning device according to claim 1, wherein the optical scanning device is inserted into a concave portion of the housing containing glass, and optical position adjustment is performed. . 8. When fixing the convex part of the optical member and the concave part of the housing with an adhesive, the adhesive is solidified so as to form a several millimeter layer in the concave part, and then the next several millimeter layer is formed. 2. The optical scanning device according to claim 1, wherein the adhesive is further added and solidified, and the parts are fixed in the order of thin layers from the lower part for fixing the parts, thereby fixing the parts. 9. When fixing the convex part of the optical member and the concave part of the housing with an adhesive, the adhesive is an ultraviolet curable adhesive, and after the adhesive is injected into the concave part, the adhesive is concentrically formed from the periphery of the concave part. 2. The optical scanning device according to claim 1, wherein an ultraviolet beam is radiated so as to solidify in order, and the adhesive is cured so as to form a thin layer, and the component is fixed. 10. When fixing the convex portion of the optical member and the concave portion of the housing with an adhesive, the adhesive is an ultraviolet-curing adhesive, and after the adhesive is injected into the concave portion, the concave portion is irradiated with an ultraviolet beam once. The curing is started, the irradiation position of the ultraviolet beam is moved to a place where the deformation due to curing shrinkage is corrected while the position of the component is continuously measured, the adhesive is cured, and the component is fixed at the measurement position. The optical scanning device according to claim 1. 11. When fixing the convex part of the optical member and the concave part of the housing with an adhesive, the adhesive is an ultraviolet curable adhesive, and after the adhesive is injected into the concave part, it is irradiated with an ultraviolet beam and cured once. After measuring the position of the part, apply an appropriate amount of adhesive again to the position to correct the misalignment due to curing shrinkage, irradiate with an ultraviolet beam, cure the adhesive, and fix the part at the specified position The optical scanning device according to claim 1, wherein: