CN216285969U - Optical scanning unit and electronic imaging device - Google Patents

Abstract

An optical scanning unit includes an optical deflector and an optical box for accommodating the optical deflector; the optical deflector includes a rotary polygonal mirror for deflecting a light beam and a substrate for supporting the rotary polygonal mirror; the optical box comprises a mounting area for mounting the optical deflector, and a mounting surface for mounting the substrate is arranged at the mounting area; the substrate is arranged on the mounting surface, and an adhesive layer is arranged between the mounting surface and the substrate. The optical scanning unit can better ensure the flatness and stability of the optical deflector after installation, and solves the problem that the optical performance of the optical scanning unit is affected due to low flatness accuracy and instability of an installation surface.

Description

Optical scanning unit and electronic imaging device

Technical Field

The present disclosure relates to optical scanning devices, and particularly to an optical scanning unit and an electronic imaging device.

Background

The optical deflector is a very important component of the optical scanning unit of the printer on the optical path thereof, and is mainly responsible for deflecting the light beam emitted from the light source in the optical scanning unit.

The accuracy of the mounting position of the optical deflector inside the optical scanning unit has a great influence on the optical performance of the whole optical scanning unit, and particularly, when a light beam is incident on the reflecting surface of the optical deflector, the accuracy of the incident angle in the sub-scanning direction thereof is more sensitive to the influence on the optical performance, while the flatness of the mounting plane of the optical deflector directly influences the angle of the optical deflector relative to the light beam in the sub-scanning direction, so that the mounting flatness of the optical deflector is required to be as small and stable as possible. In the related art, the optical deflector is mounted in a mounting frame of the optical scanning unit, an optical deflector mounting area is disposed in the mounting frame, and a material of the mounting frame of the optical scanning unit is usually a sheet metal material, and a processing manner is usually a stamping forming processing manner.

However, the sheet metal material and the processing method of the punch forming easily cause the flatness of the mounting area of the optical deflector to have low precision and instability, thereby affecting the optical performance of the optical scanning unit.

SUMMERY OF THE UTILITY MODEL

The application provides an optical scanning unit and an electronic imaging device, which are used for solving the technical problem that the optical performance of the optical scanning unit is influenced due to low flatness accuracy and instability of an optical deflector installation area.

The application provides the following technical scheme for solving the technical problems:

an optical scanning unit comprising an optical deflector and an optical box for accommodating the optical deflector;

the optical deflector includes a rotary polygonal mirror for deflecting a light beam and a substrate for supporting the rotary polygonal mirror;

the optical box comprises a mounting area for mounting the optical deflector, and a mounting surface for mounting the substrate is arranged at the mounting area;

the substrate is arranged on the mounting surface, and an adhesive layer is arranged between the mounting surface and the substrate.

The utility model has the beneficial effects that: the application ensures the flatness and stability of the installation of the optical deflector by arranging the adhesive layer between the installation surface of the installation area of the optical deflector and the substrate, because the thickness of the adhesive layer can be adjusted before the adhesive is not solidified, when the optical deflector is installed, after the substrate of the optical deflector is placed on the installation surface of the installation area of the optical deflector, the installation precision of the optical deflector is ensured by solidifying the adhesive layer arranged between the installation surface and the substrate, the flatness of the optical deflector during installation is maintained after the adhesive layer is solidified, the position stability of the optical deflector can be ensured after the optical deflector is stably adhered on the installation surface and the installation is completed by the adhesive layer, and the thickness of the adhesive layer can be adjusted before the adhesive is not solidified, thereby even if the flatness of the installation surface is not good, the installation of the optical deflector can not be influenced, as long as the flatness of the optical deflector during installation is ensured, the influence caused by poor flatness of the installation surface can be eliminated by adjusting the thickness of the adhesive layer between the installation surface and the substrate, so that the flatness of the installation of the optical deflector is ensured.

Preferably, a plurality of bosses are arranged on the mounting surface, the substrate is arranged on the bosses, and the adhesive layer is positioned between the bosses and the substrate;

a plurality of second mounting holes are formed in the base plate corresponding to the bosses, and the size of each second mounting hole is smaller than that of the upper surface of each boss.

Preferably, the thickness of the adhesive layer is 0.2 to 0.6 mm.

Preferably, the adhesive layer is an ultraviolet light curing glue layer.

Preferably, the boss is provided with a threaded hole and a screw matched with the threaded hole, the screw correspondingly penetrates through the second mounting hole and then is screwed into the threaded hole of the boss, and after the screw is screwed into the threaded hole of the boss, the head of the screw is pressed on the substrate around the second mounting hole.

Preferably, the outer periphery of the adhesive layer covers an area larger than the area of the screw head in the transverse direction, and the head of the screw is correspondingly placed above the area covered by the outer periphery of the adhesive layer.

Preferably, the optical deflector further includes a driving motor, the driving motor includes a fixing shaft disposed at a lower portion thereof, the substrate is further provided with a first mounting hole, the fixing shaft of the driving motor penetrates through the substrate from the first mounting hole and is fixedly connected to the substrate at the first mounting hole, a positioning hole is disposed on the substrate corresponding to the first mounting hole, and a portion of the fixing shaft penetrating through the substrate is disposed in the positioning hole.

Preferably, the base plate is further provided with a third mounting hole, a positioning protrusion is arranged on the mounting surface corresponding to the third mounting hole, the radial size of the positioning protrusion is matched with the radial size of the third mounting hole, and when the base plate is mounted on the mounting area of the optical deflector, the positioning protrusion penetrates through the base plate from the third mounting hole.

Preferably, the boss with the second mounting hole is 3, the base plate is the rectangle structure, the four corners department of base plate is the fillet structure and the four corners department all is less than the last plane of base plate forms low-lying region, the bottom surface in low-lying region is the plane, third mounting hole and 3 second mounting holes are located respectively in the low-lying region of base plate four corners department.

The utility model also provides an electronic imaging device comprising an optical scanning unit as described in any of the above claims.

The advantages of the electronic imaging device of the utility model are the same as those of the optical scanning unit, and are not described herein again.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.

FIG. 1 is a schematic view showing an assembly of an optical deflector in embodiment 1;

FIG. 2 is a sectional view taken along line G-G of FIG. 1;

FIG. 3 is a schematic view of an electronic imaging device in accordance with the present invention;

fig. 4 is a view of an optical system of the optical scanning unit in the main scanning direction X;

fig. 5 is a view of an optical system of the optical scanning unit in the sub-scanning direction Y;

FIG. 6 is a block diagram of an optical scanning unit;

FIG. 7 is a plan view showing the assembly of the optical deflector in embodiment 2;

fig. 8 is a front view showing the assembly of the optical deflector in embodiment 2.

Description of reference numerals:

100. an optical scanning unit;

110. a light source; 120. a grating; 130. an incident optical system; 140. an optical deflector; 150. an imaging optical system; 160. a line-synchronous focusing lens; 170. a line synchronization sensor; 180. an optical box;

141. a rotating polygonal mirror; 142. a substrate; 142a, a second mounting hole; 142b, a third mounting hole; 142c, a low-lying area; 143. a drive motor; 143a, a fixed shaft;

181. a mounting surface; 181a, positioning holes; 182. an adhesive layer; 183. positioning protrusions; 184. a boss; 185. a screw;

200. a paper feeding unit;

300. a conveying unit;

400. an imaging unit;

410. a photosensitive drum; 410a, an imaging surface; 420. a cleaning unit; 430. a charging roller; 440. a developing roller;

500. a transfer unit;

600. a fixing unit;

610. a first heating roller; 620. a second pressure roller; 630. a pair of discharge rollers;

700. a paper discharge tray;

800. a carton;

900. a frame;

K. a light beam;

p, a recording medium;

x, main scanning direction;

y, sub-scanning direction.

With the above figures, there are shown specific embodiments of the present application, which will be described in more detail below. These drawings and written description are not intended to limit the scope of the inventive concepts in any manner, but rather to illustrate the inventive concepts to those skilled in the art by reference to specific embodiments.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

In the related art, in order to reduce the cost of the optical scanning unit, the material selection of the mounting frame in the optical scanning unit is more and more inclined to the sheet metal material, and the mounting frame is usually processed by press forming, but due to the defects of the sheet metal material and the processing performance of the press forming, the flatness accuracy of the mounting plane of the mounting area of the optical deflector is low and unstable. Especially, when the mounting frame of the optical scanning unit is composed of a plurality of metal plate parts and fixed by screws, the flatness of the mounting plane is further deteriorated, which seriously affects the optical performance of the optical scanning unit and also increases the quality control cost of the mounting frame of the optical scanning unit.

In view of this, the utility model is based on the property that the thickness of the adhesive can be adjusted by pressing or the like before the adhesive has not set, an adhesive layer is provided between a substrate of the optical deflector and a mounting plane of the optical deflector mounting area, the influence caused by poor flatness of the mounting surface can be eliminated by adjusting the thickness of the adhesive layer between the mounting surface and the substrate, thereby ensuring the flatness of the optical deflector mounting, that is, when the optical deflector is installed, after the substrate of the optical deflector is placed on the installation surface of the installation area of the optical deflector with guaranteed flatness, the mounting accuracy of the optical deflector is ensured by the solidification of the adhesive layer interposed between the mounting surface and the substrate, the flatness of the optical deflector when mounted is maintained after the adhesive layer is solidified, and the adhesive layer can stably adhere the optical deflector to the mounting surface and can also ensure the position stability of the optical deflector after the mounting is finished.

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

FIG. 1 is a schematic view showing an assembly of an optical deflector in embodiment 1; FIG. 2 is a sectional view taken along line G-G of FIG. 1; FIG. 3 is a schematic view of an electronic imaging device in accordance with the present invention; fig. 4 is a view of an optical system of the optical scanning unit in the main scanning direction X; fig. 5 is a view of an optical system of the optical scanning unit in the sub-scanning direction Y; fig. 6 is a structural view of the optical scanning unit.

In fig. 1, 2, 4, and 5, X is the main scanning direction and Y is the sub-scanning direction.

As shown in fig. 1, 2 and 6, the optical scanning unit provided by the present embodiment includes an optical deflector 140 and an optical box 180 for accommodating the optical deflector 140, the optical deflector 140 specifically includes a rotating polygonal mirror 141 for deflecting a light beam and a base plate 142 for supporting the rotating polygonal mirror 141, the optical box 180 specifically includes a mounting area for mounting the optical deflector, a mounting surface 181 for mounting the base plate 142 is provided at the mounting area, the base plate 142 is disposed on the mounting surface 181, and an adhesive layer 182 is provided between the mounting surface 181 and the base plate 142.

The thickness of the adhesive layer 182 is adjustable before the adhesive is not cured, and when the optical deflector 140 is mounted, the adhesive is firstly placed at a corresponding position of the mounting surface 181, then the substrate 142 of the optical deflector 140 is placed on the mounting surface 181 of the mounting area of the optical deflector 140 with guaranteed flatness, and the mounting accuracy of the optical deflector 140 is guaranteed by curing the adhesive layer 182 placed between the mounting surface 181 and the substrate 142. Because the thickness of the adhesive layer 182 is adjustable before the adhesive is solidified, the optical deflector 140 is fixedly connected by the adhesive layer 182, so that the influence caused by poor flatness of the mounting surface 181 can be eliminated, the flatness of the substrate 142 only needs to be determined during mounting, and the optical deflector can be adjusted by the adhesive layer 182 even if the flatness of the mounting surface 181 is poor. The scheme of the application better solves the problem that the optical performance of the optical scanning unit is influenced due to the fact that the flatness accuracy of the mounting surface 181 is low and unstable.

In some embodiments of the present disclosure, the mounting surface 181 is provided with a plurality of bosses 184, the substrate 142 is disposed on the bosses 184, the adhesive layer 182 is located between the bosses 184 and the substrate 142, preferably, at least three bosses 184 are provided, and the three bosses 184 are not in a straight line, because the substrate 142 can be better supported by the three or more bosses 184 that are not in a straight line, and the disposition of the bosses 184 provides an indication placement point for the placement of the adhesive layer, which can ensure the uniformity of the mounting performance of the optical deflector 140; on the other hand, the installation of the bosses 184 can eliminate the influence of the poor flatness of the installation surface 181, the flatness of the installation surface 181 of the installation area of the optical deflector 140 in the optical box 180 is determined by the processing, the adjustment is difficult at the later stage, even if the flatness of the installation surface 181 is poor, the influence of the poor flatness of the installation surface 181 on the part can be buffered by adjusting the heights of the bosses 184 to make the heights of the upper surfaces of the plurality of bosses 184 as the same as possible, and furthermore, if the flatness of the installation surface 181 is poor, the adhesive layer 182 is directly arranged between the substrate 142 and the installation surface 181, the adhesive layer needs to be arranged thickly, the adhesive layer 182 is not easy to dry, and the long time for waiting for the drying of the adhesive layer 182 is needed when the optical deflector 140 is installed, which is not favorable for the installation efficiency of the optical deflector 140.

Further, a plurality of second mounting holes 142a are formed in the substrate 142 corresponding to the plurality of bosses 184, the size of the second mounting holes 142a is smaller than the size of the upper surfaces of the bosses 184, and the adhesive layer 182 is located between the substrate 142 around the second mounting holes 142a and the upper surfaces of the bosses 184. The second mounting hole 142a can be set as a viewing hole for the adhesive layer, and at the same time, if the substrate 142 is mounted, the adhesive layer 182 is pressed downward, and the adhesive can overflow into the second mounting hole 142a, so that the contact area between the adhesive and the substrate 142 is increased to some extent by the arrangement of the second mounting hole 142a, and the adhesive and the substrate 142 are in contact in the transverse direction and the vertical direction, so that the stability of the adhesive layer 182 for bonding the substrate 142 and the boss 184 is increased.

In some preferred embodiments of the present application, the adhesive layer 182 is an ultraviolet curing adhesive layer, and the ultraviolet curing adhesive can be cured quickly under the irradiation of ultraviolet rays, that is, before the optical deflector 140 is installed, the ultraviolet curing adhesive is placed on the boss 184 of the installation surface 181, then the substrate 142 is placed on the ultraviolet curing adhesive with guaranteed flatness, and then an ultraviolet tube is irradiated from the second installation hole 142a to cure the ultraviolet curing adhesive, at this time, the second installation hole 142a serves as a light through hole, which plays a role of light transmission, so that the ultraviolet rays are irradiated onto the ultraviolet curing adhesive on the lower portion of the substrate 142 through the substrate 142.

Of course, the uv light may be irradiated through other positions, for example, the material of the optical box 180 in this application may be plastic, metal or other material obtained by injection molding, stamping or other processing methods, and when the optical box 180 is made of a material that is transparent to uv light, the uv light may be irradiated from the side or bottom of the mounting area of the optical deflector 140.

It should be noted that the adhesive used in the adhesive layer 182 is not limited to the uv curable adhesive, and may be other adhesive materials having adhesive effect.

Further, the thickness of the adhesive layer 182 is 0.2-0.6mm, preferably 0.3mm, but it may also be 0.2mm or 0.3mm, and the thickness of the adhesive is moderate, if the adhesive layer 182 is too thin, the adhesive layer 182 will not adhere well, and if the flatness of the upper surface of the boss 184 is not ideal, the too thin adhesive layer 182 may not meet the flatness requirement of the substrate 142; if the adhesive layer 182 is too thick, the adhesive layer is not easily solidified at the time of solidification, and therefore, a long time is required to wait for the adhesive layer 182 to dry at the time of mounting the optical deflector 140, which is disadvantageous in the mounting efficiency of the optical deflector 140.

In this embodiment, the optical deflector 140 further includes a driving motor 143, the driving motor 143 includes a fixed shaft 143a disposed at a lower portion thereof, the substrate 142 is further provided with a first mounting hole, the fixed shaft 143a of the driving motor 143 penetrates the substrate 142 from the first mounting hole and is fixedly connected to the substrate 142 at the first mounting hole, the substrate 142 is provided with a positioning hole 181a corresponding to the first mounting hole, a portion of the fixed shaft 143a penetrating the substrate 142 is disposed in the positioning hole 181a, and the fixed shaft 143a cooperates with the positioning hole 181a to realize the positioning of the optical deflector 140 in the main scanning direction X.

Further, the substrate 142 is further provided with a third mounting hole 142b, a positioning protrusion 183 is arranged on the mounting surface 181 corresponding to the third mounting hole 142b, the radial dimension of the positioning protrusion 183 is matched with the radial dimension of the third mounting hole 142b, when the substrate 142 is mounted on the mounting area of the optical deflector, the positioning protrusion 183 penetrates through the substrate 142 from the third mounting hole 142b, and the positioning protrusion 183 is matched with the third mounting hole 142b to realize the positioning of the optical deflector 140 in the main scanning direction X.

Specifically, the fixing shaft 143a and the positioning hole 181a cooperate, and the positioning protrusion 183 and the third mounting hole 142b cooperate to achieve the positioning of the optical deflector 140 in the main scanning direction X, so that the optical deflector 140 does not shake in the main scanning direction X, and, of course, with the adhesive layer 182, the substrate 142 does not shake in the main scanning direction X, but under the cooperation of the fixing shaft 143a with the positioning hole 181a and the positioning projection 183 with the third mounting hole 142b, so that the adhesive layer 182 is hardly stressed in the main scanning direction X, that is, the main acting direction of the adhesive layer 182 is the sub-scanning direction Y, therefore, the fixing shaft 143a is fitted into the positioning hole 181a and the positioning protrusion 183 is fitted into the third mounting hole 142b, which can increase the stability of the adhesive layer 182, thereby increasing the stability of the entire optical deflector 140.

Furthermore, the number of the bosses 184 and the number of the second mounting holes 142a are 3, the substrate 142 has a rectangular structure, and the third mounting holes 142b and the 3 second mounting holes 142a are respectively located at four corners of the substrate 142.

The embodiment also provides an electronic imaging device, which comprises the optical scanning unit of any one of the above technical schemes.

In some embodiments of the present application, the electronic imaging device of the present application is specifically an electronic imaging device of a black and white laser printer, but the utility model and the point to be protected of the present application are a structure in which the optical deflector is installed in the optical box 180 and an electronic imaging device having the structure, so the application of the present application is not limited to a black and white laser printer, and the present application can also be correspondingly applied to a color laser printer and other devices.

As shown in fig. 3, the electronic image forming apparatus of the monochrome laser printer includes an optical scanning unit 100, a paper feeding unit 200, a carrying unit 300, an image forming unit 400, a transfer unit 500, a fixing unit 600, a paper discharge tray 700, and a paper cassette 800, which are respectively fixed to a frame 900, wherein the optical scanning unit 100 in the electronic image forming apparatus is the optical scanning unit according to any one of the above-mentioned embodiments.

The working principle and the working process of the electronic imaging device are as follows: the control system of the printer controls the optical scanning unit 100 to emit the light beam K and scan onto the surface of the photosensitive drum 410 in the image forming unit 400, the surface of the photosensitive drum 410 being the image forming surface 410a, the photosensitive drum 410 being a photoreceptor including a cylindrical metal tube having an outer circumference and a photosensitive layer having a predetermined thickness formed on the outer circumference. The charging roller 430 in the image forming unit 400 rotates and contacts the photosensitive drum 410, and charges the surface of the photosensitive drum 410. The optical scanning unit 100 scans the light beam K adjusted according to image information, thereby forming an electrostatic latent image on the image forming surface of the photosensitive drum 410 charged by the charging roller 430. In this case, as the photosensitive drum 410 rotates, the image forming surface moves in the sub-scanning direction, and the optical scanning unit 100 is synchronized with the horizontal synchronization signal to scan the light beam onto the image forming surface 410a in the main scanning direction, and therefore, an electrostatic latent image is formed on the image forming surface 410a of the surface of the photosensitive drum 410. The developing roller 440 contacts the photosensitive drum 410 and transfers toner to the surface of the photosensitive drum 410, thereby forming a toner image, which is called development.

On the other hand, the recording media P are stacked in a paper cassette 800, and the paper feed unit 200 rotates according to the instruction of the printer to sequentially feed the recording media P to the conveyance unit 300, which in turn feeds the recording media P between the image forming unit 400 and the transfer unit 500 and into surface contact with the photosensitive drum 410. As the photosensitive drum 410 rotates, the toner image on the surface of the photosensitive drum 410 is transferred to the recording medium P by the transfer unit 500, which is called transfer, and the transfer unit 500 has a certain voltage, so that the toner image on the surface of the photosensitive drum 410 can be more easily adsorbed to the recording medium P. In addition, residual toner on the surface of the photosensitive drum 410 after transfer is cleaned and removed by the cleaning unit 420.

The toner image transferred onto the recording medium P is heated by the first heating roller 610 of the fixing unit 600 to be fused and fixed to the recording medium P by the pressure of the second pressing roller 620, which is called fixing.

The fixed recording medium P is discharged onto a discharge tray 700 outside the printer by being conveyed by a discharge roller pair 630, thereby completing the entire printing process.

The structure of the optical scanning unit in the black and white laser printer will be further described with reference to the specific application example of the present invention, but the optical scanning unit in the present invention is not limited to the following scheme.

As shown in fig. 4 to 6, the optical scanning unit 100 includes an optical box 180, and a light source 110, a grating 120, an incident optical system 130, an optical deflector 140, an imaging optical system 150, a line synchronization focusing lens 160, and a line synchronization sensor 170 mounted in the optical box 180, wherein an adhesive layer 182 is disposed between the optical deflector 140 and a mounting surface 181 of a mounting area of the optical deflector 140 in the optical box 180, and the specific scheme is as described above and is not described herein again.

The optical system of the optical scanning unit 100 and its operation principle will be described in detail below.

The light source 110 is a Laser Diode (LD) or a Light Emitting Diode (LED) having at least 1 light emitting point, and emits a light beam K as a light source of the optical scanning unit 100.

The grating 120 shapes the light beam K emitted from the light source 110, and the grating 120 has an opening (hole) whose shape may be circular, elliptical, or rectangular, and although the grating 120 in fig. 2 is disposed between the light source 110 and the incident optical system 130, it is not limited to this position or may even be omitted.

The incident optical system 130 is disposed between the light source 110 and the optical deflector 140, the incident optical system 130 includes a collimator lens that transforms the light beam K emitted from the light source 110 into a parallel light beam and a cylindrical lens that converges the parallel light beam onto a deflecting surface of the optical deflector 140 in the sub-scanning direction Y, and the incident optical system 130 may also be a single anamorphic lens (DOE) that performs functions of the collimator lens and the cylindrical lens, which may be made of a plastic material or a glass material.

The optical deflector 140 deflects and scans the light beam K onto the imaging surface 410a along the main scanning direction X, a rotating polygon mirror 141 having a plurality of mirror surfaces may be used as the rotating polygon mirror 140 of the optical deflector 140, and the light beam K emitted from the light source 110 impinges on the rotating polygon mirror 141 of the optical deflector 140 to be deflected and reflected toward the target surface (imaging surface 410a) to be scanned along the main scanning direction X, preferably, the number of deflection surfaces of the rotating polygon mirror 141 is 4, and of course, the number of deflection surfaces of the rotating polygon mirror 141 may be more than 4.

The imaging optical system 150 is an optical lens that images the light beam K deflected by the optical deflector 140 on the imaging surface 410a, is provided between the optical deflector 140 and the imaging surface 410a, and in the sub-scanning direction Y, the imaging optical system 150 is arranged between the optical deflector 140 and the imaging surface 410a in a conjugate relationship with each other, and may be made of plastic or glass. The imaging optical system 150 can cause the light beam K deflected by the optical deflector 140 to be scanned onto the imaging surface 410a at a constant or varying linear velocity in the main scanning direction X, and image the light beam K onto the imaging surface 410a in the main scanning direction X and the sub-scanning direction Y. The imaging optical system 150 may be one imaging optical lens, or may include a plurality of imaging optical lenses.

The line synchronization focusing lens 160 is disposed on an upstream side of the imaging optical system 150 in the deflection direction of the optical deflector 140 between the light source 110 and the optical imaging system 105, and focuses the light beam K deflected by the optical deflector 140 onto the surface of the line synchronization sensor 170. But the position of the line-synchronized focusing lens is not limited thereto and may even be omitted.

The line synchronization sensor 170 is configured to receive the light beam focused by the line synchronization focusing lens and generate an electrical signal (line synchronization signal) for controlling the light emitting timing of the light source 110, so that the scan line of each line on the imaging surface 410a is aligned in the main scanning direction X.

Example 2

FIG. 7 is a plan view showing the assembly of the optical deflector in embodiment 2; fig. 8 is a front view showing the assembly of the optical deflector in embodiment 2.

The utility model also provides a method of operating an optical scanning unit, in which embodiment the optical scanning unit is substantially the same as that of embodiment 1, except that: as shown in fig. 7 and 8, the boss 184 is provided with a threaded hole and a screw 185 matched with the threaded hole, the screw 185 is correspondingly screwed into the threaded hole of the boss 184 after passing through the second mounting hole 142a, after the screw 185 is screwed into the threaded hole of the boss 184, the head of the screw 185 is pressed on the substrate 142 around the second mounting hole 142a, and the arrangement of the screw 185 further reinforces the stability of the optical deflector 140, which realizes that the adhesive layer 182 can be arranged between the bosses 184 of the substrate 142 only as an adjusting layer, and more importantly, the adhesive layer serves to balance the flatness of the mounting surface 181 and the upper surface of the boss 184, thereby ensuring the flatness accuracy when the substrate 142 is mounted.

In some embodiments of the present application, the area covered by the outer periphery of the adhesive layer 182 is larger than the area of the head of the screw 185, and the head of the screw 185 is correspondingly disposed above the area covered by the outer periphery of the adhesive, that is, the projection of the screw 185 on the substrate 142 along the sub-scanning direction Y is wholly or mostly contained within the projection profile of the adhesive layer 182 on the substrate 142 along the sub-scanning direction Y, that is, the width W1 ≧ W2 (or W1 is close to W2) is made as much as possible, which can ensure the stress balance of the substrate 142.

In some embodiments of the present application, each of the bosses 184 and the second mounting holes 142a is 3, the substrate 142 has a rectangular structure, each of four corners of the substrate 142 has a rounded structure, and each of the four corners is lower than the upper plane of the substrate 142 to form a low-lying region 142c, the bottom surface of the low-lying region 142c is a plane, the third mounting holes 142b and the 3 second mounting holes 142a are respectively located in the low-lying regions 142c of the four corners of the substrate 142, that is, the four corners of the substrate 142 are sunken regions, and the low-lying regions 142c of the four corners provide mounting regions for the screws 185, so that the heads of the screws 185 are prevented from protruding out of the substrate 142, and the positioning protrusions 183 can extend out of the substrate 142 from the third mounting holes 142 b.

Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the utility model following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the utility model pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.

It will be understood that the present application is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.

Claims (10)

1. An optical scanning unit characterized by comprising an optical deflector and an optical box for accommodating the optical deflector;

the optical deflector includes a rotary polygonal mirror for deflecting a light beam and a substrate for supporting the rotary polygonal mirror;

the optical box comprises a mounting area for mounting the optical deflector, and a mounting surface for mounting the substrate is arranged at the mounting area;

the substrate is arranged on the mounting surface, and an adhesive layer is arranged between the mounting surface and the substrate.

2. An optical scanning unit according to claim 1, wherein the mounting surface is provided with a plurality of bosses on which the substrate is disposed, the adhesive layer being located between the bosses and the substrate;

a plurality of second mounting holes are formed in the base plate corresponding to the bosses, and the size of each second mounting hole is smaller than that of the upper surface of each boss.

3. An optical scanning unit according to claim 2, characterized in that the thickness of the adhesive layer is 0.2-0.6 mm.

4. An optical scanning unit according to claim 2, characterized in that the adhesive layer is a uv-curable glue layer.

5. The optical scanning unit as claimed in claim 2, wherein the boss has a threaded hole and a screw engaged with the threaded hole, the screw is correspondingly threaded into the threaded hole of the boss after passing through the second mounting hole, and after the screw is threaded into the threaded hole of the boss, the head of the screw presses on the substrate around the second mounting hole.

6. An optical scanning unit according to claim 5, characterized in that the adhesive layer outer periphery covers an area larger than the area transversely of the head of the screw, which head of the screw is correspondingly placed above the area covered by the adhesive outer periphery.

7. The optical scanning unit according to any of claims 1-6, wherein the optical deflector further comprises a driving motor, the driving motor comprises a fixing shaft disposed at a lower portion thereof, the base plate is further provided with a first mounting hole, the fixing shaft of the driving motor penetrates the base plate from the first mounting hole and is fixedly connected to the base plate at the first mounting hole, a positioning hole is disposed on the base plate corresponding to the first mounting hole, and a portion of the fixing shaft penetrating the base plate is disposed in the positioning hole.

8. The optical scanning unit as claimed in any one of claims 2-6, wherein a third mounting hole is further formed on the substrate, a positioning protrusion is formed on the mounting surface corresponding to the third mounting hole, the radial dimension of the positioning protrusion matches with the radial dimension of the third mounting hole, and when the substrate is mounted on the mounting region of the optical deflector, the positioning protrusion passes through the substrate from the third mounting hole.

9. The optical scanning unit according to claim 8, wherein the number of the bosses and the number of the second mounting holes are 3, the substrate has a rectangular structure, the four corners of the substrate have rounded corner structures and are each lower than the upper plane of the substrate to form a depressed area, the bottom surface of the depressed area is a plane, and the number of the third mounting holes and the number of the second mounting holes are 3, respectively, in the depressed area at the four corners of the substrate.

10. An electronic imaging device, comprising the optical scanning unit according to any one of claims 1 to 9.

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