WO2006014023A1 - 光学走査装置 - Google Patents
光学走査装置 Download PDFInfo
- Publication number
- WO2006014023A1 WO2006014023A1 PCT/JP2005/014789 JP2005014789W WO2006014023A1 WO 2006014023 A1 WO2006014023 A1 WO 2006014023A1 JP 2005014789 W JP2005014789 W JP 2005014789W WO 2006014023 A1 WO2006014023 A1 WO 2006014023A1
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- WIPO (PCT)
- Prior art keywords
- light
- shielding plate
- scanning
- optical
- deflector
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/435—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material
- B41J2/47—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material using the combination of scanning and modulation of light
- B41J2/471—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material using the combination of scanning and modulation of light using dot sequential main scanning by means of a light deflector, e.g. a rotating polygonal mirror
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
- G02B26/10—Scanning systems
- G02B26/12—Scanning systems using multifaceted mirrors
Definitions
- the present invention relates to an optical scanning device mounted on an image forming apparatus such as a copying machine or a printer.
- the laser beam (light beam) generated from a light source is deflected by a rotating polygon mirror after passing through a scanning lens, and then re-executed.
- the present invention relates to an optical scanning device equipped with a so-called double-pass optical system that passes through a scanning lens and emits toward a scanned surface (photosensitive body).
- the scanning speed of the photosensitive drum by the light beam must be increased.
- There are methods to increase the scanning speed such as increasing the rotational speed of the rotating polygon mirror and using multiple light sources to make it a multi-beam, but the overfield type can increase the number of reflecting surfaces while suppressing the diameter of the rotating polygon mirror.
- Optical scanning devices are also known as one way to increase scanning speed.
- the overfield type optical scanning device is characterized in that the width of the laser beam incident on the rotating polygon mirror in the main scanning direction is larger than the width of one surface of the rotating polygon mirror in the main scanning direction.
- the over-field type optical scanning device uses a method in which the light beam is incident on the rotating polygon mirror with a front surface in the main scanning direction and an angle in the sub-scanning direction. In general.
- the light beam passes through the scanning lens (f ⁇ lens) and is incident on the rotating polygon mirror, and is reflected by the rotating polygon mirror.
- a so-called double-pass type optical scanning device has also been proposed in which the light beam transmitted again passes through the scanning lens. No. 0 6-3 5 2 1 2 and No. 0 6 2 7 9 0 2 describe double-pass type optical scanning devices.
- the double-pass type optical scanning device is an optical scanning device having a mechanism in which a laser beam is incident on a scanning lens, light emitted from the scanning lens is deflected by a rotary polygon mirror, and then again passes through the scanning lens. .
- the laser beam that has passed through the scanning lens twice is then guided to a photosensitive drum as an image carrier of the image forming apparatus, and forms an electrostatic latent image on the photosensitive drum.
- the laser beam reflected by the scanning lens before being deflected by the rotating polygon mirror is always irradiated at the same position in the center of the photosensitive drum because the optical path is always the same.
- the amount of reflected light is small, it causes unnecessary electrostatic latent images to be formed. As a result, the sharpness of the image formed on the photosensitive drum may be lowered.
- an expensive antireflection coating such as a multilayer film may be applied to the surface of the scanning lens 2 in some cases.
- the coating is very expensive, the cost of the device is high ; Therefore, in the above-mentioned actual fairness 0 6-3 5 2 1 2 and special fairness 0 6-2 7 9 02, this reflected light is blocked so that the reflected light from the f 0 lens does not reach the photoconductor. It is disclosed to provide a light shielding plate.
- the laser light is incident on the reflecting surface 2 F of the rotating polygon mirror 2 obliquely in the sub-scanning direction (direction perpendicular to the deflection direction by the rotating polygon mirror).
- the optical scanning device If the incident angle (oblique incident angle ⁇ ) in the sub-scanning direction is increased, the angle formed by the laser light (incident light R i 1) toward the rotating polygon mirror and the reflected light from the scanning lens 1 increases. It is relatively easy to place a light shielding plate at a position where only reflected light is blocked without blocking R i 1 and scanning light R s 1.
- the oblique incident angle ⁇ is reduced, the area where the light shielding plate can be arranged becomes narrow, and it becomes difficult to install the light shielding plate at a position where the laser light necessary for image formation is not shielded.
- tandem type image forming apparatuses in which a plurality of image forming units are arranged in a line are widely used in full-color image forming apparatuses.
- one laser scanner unit emits laser light to multiple photoconductors (1 BOX type or 2 BOX type, etc.) There is.
- Such 1 BOX type or 2 When the above-mentioned double-repath method is used in a BOX type laser scanner unit, the number of incident light and scanning light for one rotating polygon mirror increases, so the area where the above-mentioned light shielding plate can be placed becomes even smaller, and image formation It is difficult to install a light shielding plate at a position where one laser beam is not shielded. Disclosure of the invention
- the present invention has been made in view of the above-described problems, and an object of the present invention is to provide an optical scanning device capable of shielding only the reflected light from the scanning lens while suppressing the thickness of the device.
- Another object of the present invention is to provide an optical scanning device capable of emitting only laser light to each of a plurality of scanned surfaces, and capable of shielding only reflected light from a scanning lens while suppressing the thickness of the device. There is to do.
- Still another object of the present invention includes a light source that generates laser light, a deflector that deflects laser light generated from the light source, and a scanning lens through which the laser light deflected by the deflector passes, In the optical scanning device in which the laser light generated from the light source passes through the scanning lens and is deflected by the deflector, and then passes again through the scanning lens and emits toward the scanning surface.
- Still another object of the present invention is to provide a first light source that generates a first laser beam, a second light source that generates a second laser beam, and a first light source that is generated from the first and second light sources. And a deflector for deflecting the second laser beam, and a scanning lens through which the first and second laser beams deflected by the deflector pass, and the first and second The first and second laser beams generated from the light source are both deflected by the deflector after passing through the scanning lens, and then again pass through the scanning lens and pass through the first scanned surface and the second scanned light.
- the optical scanning device that emits once toward the scanning surface
- a light-shielding plate that shields reflected light that is reflected by the scanning lens and travels toward the first or second scanned surface.
- the distance between the deflector and the scanning lens is Li
- the distance between the deflector and the light shielding plate is L 2
- the optical scanning device is characterized in that the light shielding plate is disposed within a range that satisfies the following two formulas: Is to provide.
- Still another object of the present invention is to provide a first light source that generates a first laser beam, a second light source that generates a second laser beam, and a first light source that is generated from the first and second light sources. And a deflector that deflects the second laser beam, and a scanning lens through which the first and second laser beams deflected by the deflector pass, and is generated from the first and second light sources. Both the first and second laser beams passing through the scanning lens are deflected by the deflector and then pass through the scanning lens again to pass through the first scanned surface and the second scanned surface. In the optical scanning device that respectively emits toward the
- the first and second laser beams generated from the first and second light sources and directed toward the deflector intersect before the scanning lens, and are reflected by the scanning lens at or near the intersecting position. It is another object of the present invention to provide an optical scanning device characterized in that a light shielding plate for shielding reflected light toward the first and second scanned surfaces is provided.
- FIG. 1 is a diagram showing an optical path shape of the optical scanning device according to the first embodiment.
- FIG. 2 is a view for explaining the arrangement area of the light shielding plate of the optical scanning device of the first embodiment.
- FIG. 3 is a diagram for explaining pitch unevenness due to surface eccentricity of the rotary polygon mirror in the oblique incidence optical system.
- FIG. 4 is a diagram showing an optical path shape of the optical scanning device of the second embodiment.
- FIG. 5 is a view for explaining the arrangement area of the light shielding plate of the optical scanning device of the second embodiment.
- FIG. 6 is a diagram illustrating a configuration in the vicinity of the light shielding plate of the optical scanning device according to the third embodiment.
- FIG. 7 is a diagram illustrating a configuration in the vicinity of the light shielding plate of the optical scanning device according to the fourth embodiment.
- FIG. 8 is a perspective view of the optical scanning device of the first embodiment.
- FIG. 9 is an overall schematic explanatory diagram of the image forming apparatus.
- FIG. 10 is a diagram showing how reflected light from a scanning lens reaches a photoconductor in a 2BOX type optical scanning device.
- FIG. 11 is a perspective view of the optical scanning device of the fifth embodiment.
- FIG. 12 is a perspective view of the optical scanning device of the sixth embodiment.
- FIG. 13 is a diagram showing the relationship among the light shielding plate used in the sixth embodiment, the incident light beam passage area, the scanning light flux passage area, and the reflected light irradiation area on the light shielding plate.
- FIG. 14 is a perspective view of the optical scanning device of the seventh embodiment.
- FIG. 15 is a perspective view of the optical scanning device according to the eighth embodiment.
- FIG. 16 is a diagram showing the height relationship in the sub-running direction of the light source 9, the mirror 6 for folding the incident light beam, the polygon mirror 2, and the light shielding plate 3.
- FIG. 17 is a perspective view of an optical scanning device according to the ninth embodiment.
- FIG. 18 is a perspective view of the optical scanning device according to the tenth embodiment.
- FIG. 19 is an enlarged perspective view of the holding portion of the light shielding plate used in the 10th embodiment.
- FIG. 9 is a schematic explanatory diagram of the image forming apparatus.
- the image forming apparatus 100 includes an optical scanning device 101 described later and other parts (image forming unit).
- image forming unit a plurality of photosensitive drums (image carriers) 102 (102 C, 102 Y, 102 mm, 102 mm) are arranged.
- Each of the four photosensitive drums described here corresponds to the color being developed. Cyan is Y, Yellow is Y, Magenta is ⁇ , Black is ⁇ .
- a primary charger 103 (103C, 103Y, 103mm, 103mm) that uniformly charges the photosensitive drum 102 and supplying toner to the electrostatic latent image Development unit 104 (104 C, 104 Y, 104M, 104K) and transfer roller 105 (105 C, 105Y, 105 ⁇ ) that transfers the toner image from the photosensitive drum to the transfer material 1 10 such as paper. 105 ⁇ ) and a cleaner 106 (106C, 106Y, 106 ⁇ , 106 ⁇ ) for cleaning the toner remaining without being transferred. Further, at a position sandwiched between the photosensitive drum 102 and the transfer roller 105, the transfer belt 110 for conveying the transfer material 110 is laid over a force driving roller 124 and the like.
- a fixing device 1 2 5 for fixing the toner image transferred onto the transferring material 1 1 0, and a transferring material 1 1 0 outside the apparatus.
- a discharge roller 1 2 6 is disposed to discharge the air.
- the image forming apparatus forms an image as follows. First, for the photosensitive drum 1 0 2 uniformly charged by the primary charger 1 0 3, the scanning beam (laser beam) R sl C, R sl Y, R s from the optical scanning device 1 0 1 1 M, R s IK is irradiated. Since the scanning light beam is optically modulated based on the image information, an electrostatic latent image corresponding to the image information is formed on each photosensitive drum 100.
- the scanning beam laser beam
- the electrostatic latent image is visualized by supplying cyan, yellow, magenta, and black toner from the developing unit 104. After that, the residual toner remaining on the surface of the photoconductor drum 10 2 is tallyed by the cleaner 1 06 and charged again by the primary charger 1 0 3 again to form the next color image. Is done.
- the transfer materials 1 1 0 loaded on the tray 1 2 1 are sequentially fed one by one by the feeding rollers 1 2 2 and synchronized with the image writing timing by the registration rollers 1 2 3. Then, it is fed onto the conveyor belt 1 0 7. Conveying belt 1 0 7 While being accurately conveyed, the cyan image, yellow image, magenta image, and black image formed on the surface of the photosensitive drum 1 0 2 are transferred in this order. A color image is formed by being transferred onto 0.
- the drive roller 1 2 4 accurately feeds the conveyor belt 1 0 7 and is connected to a drive motor (not shown) with little rotation unevenness.
- the color image formed on the transfer material 110 is heat-fixed by the fixing device 1 25, and then conveyed by the discharge roller 1 26 to be output outside the apparatus. (Optical scanning device)
- FIG. 8 is an explanatory diagram of the optical scanning device of the present embodiment.
- the optical scanning device 1 0 1 of the present embodiment has a light source 9 that generates a light beam (laser beam) (only a driving substrate of the light source 9 is shown in FIG. 8) and a light source that emits from the light source.
- a second scanning lens 5 disposed on the way from the reflecting mirror 4 to the photosensitive drum 10 2.
- the optical scanning device has a configuration in which the light beam passes through the first scanning lens 1 twice, which is a so-called oblique-incidence and center-incidence double-pass scanning optical system. Further, the light shielding plate 3 is arranged on the side opposite to the side on which the rotary polygon mirror 2 is arranged with the first scanning lens 1 as a boundary. The configuration of the light shielding plate 3 will be described in detail later.
- the light beam emitted from the light source follows the following path.
- an incident light beam R i 1 that is not emitted from the light source and enters the first scanning lens 1 passes through the first scanning lens 1 and then reaches the rotary polygon mirror 2 at an incident angle ⁇ .
- the incident light beam R i 1 is reflected (deflected) by the reflecting surface 2 F of the rotary polygon mirror 2 to become a scanning light beam R s 1.
- the scanning light beam R s 1 is incident again on the first scanning lens 1, passes through it, is reflected by the reflecting mirror 4, passes through the second scanning lens 5, and is guided to the photosensitive drum 10 2.
- the incident light beam R i 1 is reflected on the surface of the first scanning lens 1
- the surface with the light source or reflector 4 on the surface of the first lens 1 is referred to as the first surface 1 F 1
- the surface with the rotating polygon mirror 2 is described as the second surface 1 F 2.
- the incident light beam R i 1 is incident on the first surface 1 F 1 of the first scanning lens 1.
- the first surface 1 F 1 of the first scanning lens 1 is reflected at an angle substantially the same as the incident angle of the incident light R i 1 (a ghost on the photosensitive drum 10 2).
- ghost light that forms a light) R gl is generated.
- the incident light beam R i 1 exits from the second surface 1 F 2 of the first scanning lens 1, the reflected light is reflected by the second surface 1 F 2 of the first scanning lens 1 to the reflecting mirror 4 side.
- R g 2 is generated.
- the reflected lights R gl and R g 2 are reflected before being deflected by the rotating polygon mirror 2, the reflected light R gl follows an almost constant optical path after reflection, and the reflected light R After reflection, g 2 follows an almost constant optical path. Then, the reflected light R g 1 and R g 2 are irradiated to the same position near the center of the photosensitive drum 10 2. As a result, an electrostatic latent image different from the image to be originally obtained is formed on the photosensitive drum 102.
- the light-shielding plate 3 needs to block only the reflected light R g 'l and R g 2 without blocking the incident light beam R i 1 and the scanning light beam R s 1.
- the incident light beam R i 1 has a width of a convergence angle 2 ⁇ in the sub-scanning direction (a direction orthogonal to the main scanning direction).
- the scanning light beam R s 1 also has a divergence angle 2 0 in the sub-scanning direction. For this reason, the light shielding plate 3 has a necessary force S to be arranged at a position where it does not overlap with these.
- the double-pass scanning optical system is an oblique incidence optical system in which an incident light beam R i 1 is incident on the reflecting surface 2 F of the rotating polygon mirror 2 with an angle ⁇ . For this reason, reducing the incident angle ⁇ reduces the vertical width in FIG. 2, which is advantageous for downsizing the device. Therefore, considering the downsizing of the device, the incident light beam R i It is preferable that the incident angle ⁇ to the rotating polygon mirror 1 is smaller.
- a so-called pitch unevenness ⁇ may occur due to the surface eccentricity ⁇ ⁇ of the rotary polygon mirror 2.
- Pitch unevenness ⁇ means that the position of the scanning light beam applied to the photosensitive drum 102 is shifted in the sub-scanning direction for each surface of the rotary polygon mirror.
- the surface eccentricity ⁇ ⁇ of the rotary polygon mirror 2 remains about 10 m in consideration of the manufacturing limit, it is preferable to reduce the pitch unevenness ⁇ by setting the incident angle ⁇ to be small. Therefore, reducing the incident angle ⁇ is advantageous not only for downsizing the apparatus but also for suppressing pitch unevenness.
- the position of the light shielding plate is more strictly controlled so as not to block the incident light beam R i 1 and the scanning light beam R s 1. Must be set.
- the scanning light beam R s 1 may be shielded.
- the position of the light shielding plate 3 is set so that the light shielding plate 3 shields the reflected light R gl and R g 2 but does not shield the incident light beam R i 1 and the scanning light beam R s 1.
- this is the range of line A and line B.
- the position of the reflected light R g 2 is found.
- the distance between the rotating polygon mirror 2 and the first scanning lens 1 is L
- the distance between the rotating polygon mirror and the light shielding plate is L 2
- the incident angle of the incident light beam R i 1 with respect to the first scanning lens 1 is ⁇
- the convergence angle is 2 ⁇ (in this case, the exit angle of the scanning beam R s 1 is ⁇ and the divergence angle is 2 ⁇ ).
- the incident position of the laser beam of the rotary polygon mirror 2 is the reference in the sub-scanning direction (the two-dot chain line in Fig. 2)
- the upper side of the reference line is positive and the lower side is negative. Is reflected by the surface 1F2 on the side of the first scanning lens 1 facing the rotary polygon mirror 2 (height in the sub-scanning direction) is
- the height of the reflected light R g 2 in the sub-scanning direction with respect to the position where the reflected light R g 2 is reflected by the surface 1 F 2 on the side facing the rotary polygon mirror 2 of the first scanning lens 1 is ( La-L j) tan ( ⁇ + ⁇ )
- the lens thickness T is the optical axis of the first scanning lens 1. Although it is the thickness in the direction (thickness approximately in the center of the main scanning direction), the optical axis of the incident light beam Ri 1 and the optical axis of the first scanning lens 1 may be slightly shifted in the main scanning direction.
- the thickness T can be considered as the thickness of the incident light beam R i 1 in the direction of the optical axis in the main travel direction.
- the light shielding plate 3 is disposed within the range satisfying [Equation 1], the light shielding plate is disposed at a location separated from the incident light beam R i 1 and the scanning light beam R s 1 in the sub-scanning direction.
- the reflected light R gl and R g 2 are reliably shielded without shielding the incident light beam R i 1 and the scanning light beam R s 1. Even if the incident angle ⁇ is set small, the reflected light R g 1 and R g 2 can be blocked without blocking the incident light beam R i 1 and the scanning light beam R s 1. At the same time, it is possible to obtain a good image with little pitch unevenness P.
- the optical system of this embodiment is also an optical scanning device 2 0 1 of a double pass scanning optical system.
- the optical scanning device 201 of this embodiment can irradiate a scanning light beam to two photosensitive drums 10 2 from one laser scanner unit. Therefore, when the image forming apparatus has four photoconductors, it is only necessary to mount two laser scanner units of this embodiment.
- the light beam emitted from the light source follows the following path.
- the optical scanning device 2 0 1 emits light from a plurality of light sources.
- the emitted light beams (incident light beams R i 1 and R i 2) are incident on the same surface of the single rotary polygon mirror 2 at intervals of L 3 in the sub-scanning direction.
- the plurality of scanning light beams R s 1 and R s 2 are reflected by the reflecting mirror 4 (4 a, 4 b, 4 c), pass through the second scanning lens 5 (5 a, 5 b), and pass through the photosensitive drum 102M. , Led in the direction of 102K.
- FIG. 4 only the photosensitive drums 102M and 102K are described, but the photosensitive drums 102Y and 102C are also irradiated with scanning light beams from the optical scanning device having the same configuration.
- a configuration in which two optical scanning devices (laser scanner units) are required for four photosensitive drums in this way is called a 2 X X optical scanning device.
- this embodiment also has a smaller incident angle ⁇ , which is preferable.
- the present embodiment since the by the incidence of multiple light beams at intervals of L 3 in the sub-scanning direction, it is necessary to secure only the height distance L 3. Therefore, in order to reduce the height of the apparatus, it is preferable to make the angle ⁇ as small as possible.
- the reflected light (ghost light) generated when the incident light beams R i 1 and R i 2 are reflected on the surface of the first scanning lens 1 will be described.
- FIG. 5 As shown in the first embodiment, when the incident light beam R i 1 is incident on the first surface 1 F 1 of the first scanning lens 1, reflected light Rg 1 is generated and incident.
- reflected light Rg 2 When the light beam R i 1 is emitted from the second surface 1 F 2 of the first scanning lens 1, reflected light Rg 2 is generated.
- the reflected light R g 3 is generated when the incident light beam R i 2 is incident on the first scanning lens 1
- the reflected light R g 4 is generated when it is emitted from the first scanning lens 1.
- the reflected lights R gl, R g 2, Rg 3 and Rg 4 are generated before the incident light beams R i 1 and R i 2 are deflected by the rotating polygon mirror 2. For this reason, for the same reason as in the above-described embodiment, an electrostatic latent image different from the image that should originally be viewed is formed on the photosensitive drum 102.
- Figure 10 shows reflected light Rg l, Rg 2, R This shows how g 3 and Rg 4 reach the photoreceptors 102M and 102K. (About the position where shading plate 3 is placed)
- the light shielding plates 3 (3 a, 3 b) for shielding the reflected light Rgl, Rg2, Rg3, Rg4, an electrostatic latent image different from the image to be obtained is obtained on the photoconductor. Prevents formation on the drum 102.
- the conditions for the position where the light shielding plate 3 is arranged will be described in detail below.
- the light shielding plate 3 needs to block only the reflected light Rg 1, Rg 2, Rg 3, and Rg 4 without blocking the incident light beams R i 1 and R i 2 and the scanning light beams R s 1 and R s 2.
- the incident light beams R i 1 and R i 2 have a width of the convergence angle 2 ⁇ in the sub-scanning direction.
- the scanning light beams R s 1 and R s 2 have a divergence angle of 20 in the sub-scanning direction. For this reason, the light-shielding plate 3 needs to be arranged at a position that overlaps these.
- 3 is the portion 3 a and 3 b in FIG.
- the distance between the rotating polygon mirror 2 and the first scanning lens 1 is L, and the incident light beams R i 1 and R i 2 are incident on the rotating polygon mirror 2 in the sub-scanning direction. alpha, the convergence angle of the light beam respectively 2 theta, incident spacing of a plurality luminous flux (sub-scanning direction distance on the reflecting surface 2 F of the rotary polygon mirror 2) and L 3.
- Equation 2 represents the vicinity of the position where the incident light beams R i 1 and R i 2 intersect before entering the first scanning lens 1. If the incident light beams R i 1 and R i 2 cross each other, the area occupied by the two incident light beams R i 1 and R i 2 is the smallest. This makes it easy to block each reflected light. If the distance from the reflecting surface of the rotating polygon mirror to the position where the incident beams R i 1 and R i 2 intersect is Lx, the incident beam R based on one of the two two-dot chain lines shown in Fig. 5 Since the height of the position where i 1 and R i 2 intersect can be expressed by LX tan,
- the range of [Equation 3] can be understood by referring to the first embodiment. If the portions 3 a and 3 b of the light shielding plate 3 are arranged within the range satisfying the above [Equation 2] and [Equation 3], the ghost light is surely shielded. In addition, the angle ⁇ can be made as small as possible to obtain a good image with little pitch unevenness, and at the same time, the apparatus can be downsized.
- a tandem color image forming apparatus is provided with a 2
- a plurality of light beams can be obtained by the single rotary polygon mirror 2, so that an optical scanning device with low energy consumption of the device can be provided.
- the light shielding plate 3 mounted on the optical scanning device of the present embodiment is a plate-like integrated component that shields reflected light at the portions 3a and 3b.
- the light shielding plate 3 is provided with slits S 1 and S 2 force S for allowing the incident light beams R i1 and R i 2 and the scanning light beam R s 2 to pass therethrough. If the light-shielding plate that shields light from two places is made as an integral member, the number of members is reduced, and the cost of the light-shielding plate can be reduced. Furthermore, since it is an integral member, it is sufficient to attach one member to the device housing when attaching. As a result, the tolerance when the light shielding plate is attached can be reduced, and the position accuracy of the light shielding plate can be increased.
- the light shielding plate 3 is arranged at or near the position where the incident light beams R i 1 and R i 2 intersect, so that the incident light beams R i 1 and R i 2 and the scanning light beams R s 1 and R It becomes easy to design to block only the reflected light without blocking s2.
- the incident light beams R i 1 and R i 2 are crossed to facilitate the arrangement of the light shielding plate 3 as described above, and the crossing position is the scanning lens 1 in the traveling direction of the incident light beam. It is closer to you.
- a third embodiment of the present invention will be described with reference to FIG.
- the same components as those described above are denoted by the same reference numerals and description thereof is omitted.
- the light shielding plate is provided perpendicular to the optical axis (direction of the two-dot chain line) of the first scanning lens (parallel to the rotational axis of the rotating polygon mirror).
- the shape of the light shielding plate 3 is such that the angle formed by the optical axis of the first scanning lens and the light shielding plate (3) is smaller than 90 ° (non-parallel to the rotational axis of the rotary polygon mirror).
- the reflected light from the light shielding plate is reflected by the first surface 1 F 1 of the first scanning lens 1 to become re-reflected light Rg 5 and Rg 6, but as shown in FIG. If the angle of the light-shielding plate 3] 3 is set so as to follow the upper optical path, the re-reflected light Rg5 and Rg6 will not reach the photosensitive drum 102. Unnecessary electrostatic latent images are not formed.
- the range of this angle ⁇ is preferably 70 ° ⁇ ⁇ 90 °.
- the light shielding plate of the present embodiment is also preferably disposed within the range shown in the second embodiment.
- the light shielding plate is a plate-like integral part provided with slits S 1 and S 2 for allowing the incident light beams R i 1 and R i 2 and the scanning light beam R s 2 to pass therethrough. Moyore.
- a fourth embodiment of the present invention will be described with reference to FIG.
- the same components as those described above are denoted by the same reference numerals and description thereof is omitted.
- the light-shielding plate 3 of the present embodiment is a housing 10 of the optical scanning device.
- Slits S 1 and S 2 are formed by providing a slide inside the mold for manufacturing the molded product.
- the light shielding plate 3 and the housing 10 of the optical scanning device are integrated to realize cost reduction of the light shielding plate 3.
- the light shielding plate 3 and the housing 10 of the optical scanning device are integrated.
- the light shielding plate 3 and the lid 11 covering the opening of the housing 10 of the optical scanning device may be integrated.
- the incident light flux is applied to the light shielding plate 3.
- a slit through which R i 1 and R i 2 pass and a slit through which the scanning light beam R s 1 passes are provided.
- an inclined light shielding plate as in the third embodiment may be integrally formed with the casing or lid of the optical scanning device.
- the present embodiment is an optical scanning device that irradiates a single photoconductor with laser light corresponding to image information.
- FIG. 10 is a perspective view of the optical scanning device of the present embodiment. Parts having the same functions as those in the first embodiment are given the same numbers.
- the light beam emitted from the light source 9 and reflected by the mirror 6 is denoted by the symbol R i 0, and the light beam reflected by the mirror 6 and deflected by the rotating polygon mirror 2 is denoted by the symbol R i 1 and by the rotating polygon mirror 2.
- the light flux after being deflected is denoted by a symbol R s 1.
- R g 1 and R g 2 are reflected light from the scanning lens 1.
- the optical scanning device of the present embodiment is also deflected by the rotating polygon mirror 2 after passing through the scanning lens 1 after the laser beam (light beam) generated from the light source 9, and then the scanning lens 1 again.
- This is a double pass type that passes through and exits toward the surface to be scanned (photoconductor).
- the incident light beam R i 0 that is emitted from the light source 9 and reflected by the mirror 6 is incident on the mirror 6 with an angle in the main scanning direction with respect to the optical axis of the first scanning lens 1 and is reflected, and is rotated in many planes. Guided in the direction of the mirror 2 (the scanning light beam R s 1 deflected by the R i D o rotating polygon mirror 2 and passed through the first scanning lens 1 is not reflected by the mirror during the second scanning. The light passes through the lens 5 and further exits through the hole 12 provided in the optical box 10.
- the rotary polygon mirror 2 of the present embodiment has a diameter of 2 O mm and has a reflecting surface of 10 surfaces. The width of each surface in the main scanning direction is 5 mm, and the width of the incident light beam R i 1 reaching the rotary polygon mirror 2 in the main scanning direction is 8 mm. Yes, larger than the width of each surface of the rotating polygon mirror 2.
- the light shielding plate 3 that shields the reflected lights R g 1 and R g 2 from the scanning lens 1 is disposed upstream (front side) of the first scanning lens 1 in the traveling direction of the incident light beam R i 1.
- the scanning light beam R s 1 deflected by the rotary polygon mirror 2 passes above the light shielding plate 3.
- the light shielding plate 3 is fastened to the optical housing 10 with screws 8. Further, the light shielding plate 3 is provided with a slit 3 a through which the incident light beam R i 1 passes.
- the curvature of the first scanning lens 1 is determined so that the width of the reflected light R g 1 and R g 2 in the main traveling direction does not become too large.
- the width W of the reflected light R gl, R g 2 on the light shielding plate 3 is the main beam of the scanning light beam R s 1 at the same distance as the distance from the first running lens 1 to the light shielding plate 3.
- the curvature of the first scanning lens 1 is determined so as to be narrower than the width in the scanning direction.
- the light shielding plate 3 is arranged on the upstream side (front side) of the first scanning lens 1 in the traveling direction of the incident light beam R i 1, and the incident light beam R i 1 passes through the light shielding plate 3. Since the slits are provided, it is only necessary to make the width of the light shielding plate 3 slightly larger than the width W of the reflected light R g 1 and R g 2 on the light shielding plate 3, and there is an advantage that the light shielding plate 3 can be made smaller.
- this embodiment is a 2 B OX type optical scanning device that irradiates two photoconductors with laser light corresponding to image information.
- FIG. 12 is a perspective view of the optical scanning device of the present embodiment. Parts having the same functions as those in the second embodiment are given the same numbers. Also, up to two photoreceptors The optical paths of the two laser beams are the same as in the second embodiment, so refer to FIG.
- the light beams emitted from the light source 9 and reflected by the mirror 6 are denoted by signs R i 0 (first laser beam) and R i 0 0 (second laser beam), and reflected by the mirror 6 to rotate the polygon mirror 2. Signs R i 1 (first laser beam) and R i 2 (second laser beam) until the light beam is deflected by R, and R si (first laser beam) after being deflected by the rotating polygon mirror 2.
- the light source unit 9 includes a semiconductor laser (first light source) that generates a first laser beam and a semiconductor laser (second light source) that generates a second laser beam.
- the second light source is separated in the sub-scanning direction.
- the optical scanning device of the present embodiment is also deflected by the rotating polygon mirror 2 after passing through the scanning lens 1 after the first and second laser beams (light beams) generated from the light source 9, and then again the scanning lens 1
- This is a double pass type that passes through the beam and emits toward the first and second scanned surfaces (photosensitive bodies).
- Incident light beams R i 0 and R i 0 0 emitted from the light source 9 and reflected by the mirror 6 are incident on the mirror 6 with an angle in the main scanning direction with respect to the optical axis of the first scanning lens 1. Reflected and guided in the direction of the rotating polygon mirror 2 (R i 1 and R i 2).
- the scanning light beam R s i deflected by the rotating polygon mirror 2 and passed through the first scanning lens 1 is reflected by the mirror 4 a and then passes through the lens 5 a to be emitted.
- the scanning light beam R s 2 is reflected by the mirrors 4 b and 4 c, and then passes through the lens 5 b and exits.
- the rotary polygon mirror 2 of the present embodiment has a diameter of 20 mm and has 10 reflecting surfaces, and the width of each surface in the main scanning direction is 5 mm.
- the width of the incident light beams R i 1 and R i 2 reaching the rotary polygon mirror 2 in the main scanning direction is 8 mm, which is larger than the width of each surface of the rotary polygon mirror 2.
- the incident light beams R i 1 and R i 2 are first in the traveling direction. 1 Crosses on the upstream side (front side) of scanning lens 1. Further, the light-shielding plate 3 that shields the reflected light R gl, R g 2, R g 3 and R g 4 from the scanning lens 1 force is applied to the incident light beam R i 1 in the traveling direction of the incident light beams R i 1 and R i 2. And R i 2 at or near the intersection.
- the light shielding plate 3 of the present embodiment both ends in the main scanning direction are held by the optical housing with screws.
- the light shielding plate 3. has a slit 3b through which both the incident light beams R i 0 and R i 0 0 pass, and a slit 3 a through which both the incident light beams R i 1 and R i 2 pass.
- the scanning light beam R s 1 after being deflected by the rotating polygon mirror 2 passes above the light shielding plate 3, and the scanning light flux R s 2 after being deflected by the rotating polygon mirror 2 is below the light shielding plate 3. Pass through.
- Fig. 13 is a view of the light shielding plate 3 of the optical stirrer shown in Fig. 12 viewed from the X direction. The positional relationship between the area through which the incident light beam and the scanning light beam pass, the area irradiated with the reflected light, and the light shielding plate 3 is shown.
- the light shielding plates shown in Embodiments 2 to 4 were for attaching one end portion in the sub-scanning direction to the optical box (or integrally molding with the optical box). Therefore, the light shielding plate requires a slit S 2 through which the scanning light beam R s 2 passes, and the width of the light shielding plate in the main scanning direction of the laser beam needs to be wider than the passage area of the scanning light beam R s 2.
- the light shielding plate of the present embodiment is configured to hold both ends in the main scanning direction by the optical box, the two scanning light beams R s 1 and R s 2 can be configured to pass above and below the light shielding plate. For this reason, the light shielding plate does not require a slit through which the scanning light beams R s 1 and R s 2 pass, and the width of the light shielding plate in the direction of the main laser beam is narrower than the area through which the scanning light beams R s 1 and R s 2 pass. There is a merit that it does not matter.
- this embodiment is an optical scanning device that irradiates a single photoconductor with laser light corresponding to image information.
- the rotating polygon mirror 2 has 4 faces instead of 10 faces.
- the width of the light beam incident on the rotating polygon mirror 2 in the main scanning direction is narrower than the width of one surface of the rotating polygon mirror 2 in the main scanning direction (underfield optical system).
- FIG. 14 is a perspective view of the optical scanning device of the present embodiment. Parts having the same functions as those in the first embodiment are given the same numbers. Note that the light beam emitted from the light source 9 and reflected by the mirror 6 is denoted by R i 0, and the light beam reflected by the mirror 6 and deflected by the rotating polygon mirror 2 is denoted by R i 1 and the rotating polygon mirror 2 The light beam after being deflected by is attached with a symbol R s 1. R g 1 and R g 2 are reflected light from the scanning lens 1.
- the optical scanning device of the present embodiment also has a laser beam (flux) generated from the light source 9 and is deflected by the rotating polygon mirror 2 after passing through the scanning lens 1, and then the scanning lens 1 again.
- a laser beam (flux) generated from the light source 9 and is deflected by the rotating polygon mirror 2 after passing through the scanning lens 1, and then the scanning lens 1 again.
- This is a double pass type that passes through and exits toward the surface to be scanned (photoconductor).
- the incident light beam R i 0 that is emitted from the light source 9 and reflected by the mirror 6 enters the mirror 6 with an angle in the main scanning direction with respect to the optical axis of the first scanning lens 1 and is reflected. Guided in the direction of 2 (R i 1).
- the scanning light beam R s 1 deflected by the rotary polygon mirror 2 and passed through the first scanning lens 1 passes through the second scanning lens 5 without being reflected by the mirror in the middle, and further into the optical box 10. Light exits through the hole 1 2 provided.
- the light shielding plate 3 that shields the reflected lights R g 1 and R g 2 from the scanning lens 1 is disposed upstream (front side) of the first scanning lens 1 in the traveling direction of the incident light beam R i 1. It's awkward.
- the stray beam R s 1 deflected by the rotating polygon mirror 2 passes above the light shielding plate 3.
- the light shielding plate 3 is fastened to the optical housing 10 with screws 8.
- the light shielding plate 3 is provided with a slit 3c through which the incident light beam R i 1 passes.
- the width of the slit 3c in the main scanning direction is narrower than the incident light beam R i 1, and the slit 3 c has a diaphragm function for narrowing the light beam width of the incident light beam R i 1.
- the rotating polygon mirror is used. Also functions as an aperture.
- the width of the light beam incident on the rotating polygon mirror 2 in the main scanning direction is smaller than the width of one surface of the rotating polygon mirror 2 in the main scanning direction. Therefore, it is preferable that the light beam is narrowed down by the stop before entering the rotary polygon mirror.
- the slit provided in the light shielding plate also has a diaphragm function.
- this embodiment is an optical scanning device that irradiates a single photoconductor with laser light corresponding to image information.
- FIG. 15 is a perspective view of the optical scanning device of the present embodiment. Parts having the same functions as those in the first embodiment are given the same numbers.
- the light beam emitted from the light source 9 and reflected by the mirror 6 is denoted by the symbol R i 0, and the light beam reflected by the mirror 6 and deflected by the rotating polygon mirror 2 is denoted by the symbol R i 1 and by the rotating polygon mirror 2.
- the light flux after being deflected is denoted by a symbol R s 1.
- R g 1 and R g 2 are reflected light from the scanning lens 1.
- the optical scanning device of the present embodiment also has a laser beam (flux) generated from the light source 9. After passing through the scanning lens 1, it is deflected by the rotating polygon mirror 2, and then again passes through the scanning lens 1.
- This is a double-pass type that emits light toward the surface to be scanned (photoconductor).
- the light shielding plate 3 that shields the reflected lights R g 1 and R g 2 from the scanning lens 1 is disposed upstream (front side) of the first scanning lens 1 in the traveling direction of the incident light beam R i 1. Has been.
- the light shielding plate 3 of the present embodiment is fixed to the optical housing 10 with screws 8 a and 8 b at the end opposite to the side through which the incident light beam R i 0 passes in the laser beam main traveling direction.
- (Cantilevered) W shown in FIG. 15 is the width of the reflected light R g l, R g 2 on the light shielding plate 3.
- the width W of the reflected light R gl, R g 2 on the light shielding plate 3 is larger than the width of the scanning light beam R s 1 in the main scanning direction at the same distance as the distance from the first scanning lens 1 to the light shielding plate 3.
- the curvature of the first scanning lens 1 is determined so as to be narrower.
- the scanning light beam R s 1 passes above the light shielding plate 3.
- the light shielding plate 3 is cantilevered on the side opposite to the side through which the incident light beam R i 0 in the laser beam main scanning direction passes, the reflected light is reflected without blocking the incident light beam R i 0.
- R g 1 and R g 2 can be shielded from light.
- the width W of the reflected light R g 1 and R g 2 on the light shielding plate 3 is the same distance as the distance from the first scanning lens 1 to the light shielding plate 3 in the main scanning direction of the scanning light beam R s 1. Since it is narrower than the width, the width of the light shielding plate 3 in the laser one light main scanning direction can be reduced.
- the position of the light source 9 is made substantially the same as the height of the first scanning lens 1 and the rotary polygon mirror 2.
- the incident light beam R i 0 reaching the incident light beam reflecting mirror 6 is angled in the sub-scanning direction so that the reflecting surface of the incident light beam reflecting mirror 6 faces upward. Just do it.
- the height of the incident light beam R i 0 reaching the incident light beam reflecting mirror 6 is almost the same as the height of the light-shielding plate 3, and the thickness of the apparatus can be suppressed. come.
- the light shielding plate 3 used in the optical scanning device of the present embodiment is made of stainless steel. Further, similarly to the eighth embodiment, the one end side in the laser beam main scanning direction is a cantilever holding structure held by the optical housing 10.
- the holding part for the optical housing 10 is bent (bending part 3 L), and positioning holes 15 5 a, 15 b and fixing holes (screw holes) 7 a, 7 b provided in the bending part 3 L Is provided. Insert the positioning holes 15a and 15b of the light-shielding plate 3 into the protrusions provided on the optical housing 10 to determine the position of the light-shielding plate 3 and screw 8a and 8 into the screw holes 7a and 7b.
- the light shielding plate 3 is fixed to the optical housing 10 by passing b.
- the holding portion of the light shielding plate with respect to the optical housing is bent, the strength of the light shielding plate is improved.
- the deformation of the light shielding plate can be suppressed when the light shielding plate is manufactured or attached to the optical housing, the arrangement accuracy of the light shielding plate is improved.
- the light shielding plate 3 can be attached to the optical housing 10 from the upper side, the assemblability is improved, and the screw holes 7 a and 7 b of the optical housing 10 are also directed upward and downward. When 0 is made into a molded product, it is easy to make a mold.
- the present embodiment is a two-box type optical scanning device that irradiates two photoconductors with laser light in accordance with image information, and the first generated from the light source 9. 2nd laser beam (light beam) after passing through scanning lens 1 Rotating polygon mirror 2 And then pass again through the scanning lens 1 and the first and second surface to be driven
- FIG. 18 is a perspective view of the optical scanning device of the present embodiment
- FIG. 19 is an enlarged perspective view of the light shielding plate 3 and its holding portion.
- the incident light beams R i 1 and R i 2 intersect on the upstream side (front side) of the first staggered lens 1 in the traveling direction.
- the light-shielding plate 3 that shields the reflected lights R g 1, R g 2, 1 8 3 and 1 8 4 from the scanning lens 1 has an incident light beam R i 1 in the traveling direction of the incident light beams R i 1 and R i 2.
- R i 2 at or near the intersection.
- the light shielding plate 3 is made of stainless steel.
- the first and second light source units indicated by reference numeral 9 are arranged at positions away from the optical axis of the scanning lens 1 in the main scanning direction.
- the light source unit 9 includes a semiconductor laser (first light source) that generates a first laser beam and a semiconductor laser (second light beam) that generates a second laser beam.
- the second light source is separated in the sub-scanning direction.
- the end opposite to the side through which the incident light beams R i 0 and R i 0 0 pass in the laser beam main scanning direction is held by the optical housing (cantilevered). ing). Further, the light shielding plate 3 has a slit 3a through which both the incident light beams R i.1 and R i 2 pass.
- the scanning light beam R s 1 after being deflected by the rotating polygon mirror 2 passes above the light shielding plate 3, and the scanning light beam R s 2 after being deflected by the rotating polygon mirror 2 is more than the light shielding plate 3. Pass the lower side.
- a cantilever-type light-shielding plate that holds the end of the light source, the light path of the incident light beams R i 0 and R i 0 0 and the scanning lights R s 1 and R s 2 is not blocked.
- a practicing light shielding plate can be provided.
- the light shielding plate 3 of the present embodiment can be adjusted in height (laser beam sub-scanning direction) when the apparatus is assembled.
- the height of the light shielding plate 3 can be adjusted in the arrow A direction (Z-axis direction) according to the height of the reflected beams R g 1, R g 2, R g 3, and R g 4.
- the shading plate 3 has claw portions (elastic portions) 1 6,
- the claw portions 16 and 17 are formed by bending a part of the resin-made optical housing 10 and have elasticity in the arrow B direction (X-axis direction). It also has some elasticity in the Y-axis direction. Therefore, the light shielding plate 3 is urged in the direction of arrow B (X-axis direction) by the claw portions 16 and 17.
- the number 18 is a pin integrally formed with the optical housing 10, and the number 19 is a long hole provided in the bent portion of the light shielding plate 3, and is fitted to the pin 18. The long side of the long hole 19 is along the direction of the arrow B, making it easy to attach the light shielding plate 3 to the specified mounting position.
- the short side of the long hole 19 is almost the same length as the diameter of the pin 18 and prevents the light shielding plate 3 from moving in the main scanning direction (Y-axis direction). Therefore, all the portions that hold the light shielding plate 3 are integrally molded products made of resin.
- the reason why it is necessary to adjust the height of the light shielding plate 3 is as follows.
- the reflection angle of the incident beam reflecting mirror 6 in the sub-scanning direction (Z-axis direction) shifts, the optical path of the incident beam R i 1 and R i 2 shifts in the sub-scanning direction (arrow A direction), and follows the reflection.
- the optical paths of the beams R gl, R g 2, R g 3, and R g 4 are also shifted. Therefore, the angle accuracy of the incident beam reflecting mirror 6 needs to be managed very strictly.
- the mounting surface of the incident beam reflecting mirror 6 is cut and the angle of the incident beam reflecting mirror 6 is adjusted. Measures are required to achieve angular accuracy.
- the angle accuracy of the incident beam reflecting mirror 6 is not strictly controlled, the light path of the reflected beams Rg l, Rg 2, R g 3, and R g 4 will move.
- the height of the light it is possible to shield * f light.
- the light-shielding plate 3 whose height has been adjusted is adhered and fixed to the claw portions (inertial portions) 16 and 17 of the optical housing 10. Since the shading plate 3 has a plate shape, it is desirable to manufacture it with a metal material in consideration of strength.
- the difference in the linear expansion coefficient between the metal and the resin causes stress on the bonded part when the environmental temperature fluctuates, resulting in adhesive peeling.
- the optical expansion coefficient of optical housing is usually around 4 XE— 5 .
- the linear expansion coefficient is 1.73 XE- 5 . If the distance between the two bonding parts (Y-axis direction) is 50 mm, the difference in length of 34 ⁇ (axis direction) between the light shielding plate 3 and the optical housing 10 is 30 ° C. Occurs.
- the environmental temperature fluctuation of 30 ° C is an environmental fluctuation that can be fully considered when considering the product distribution.
- the adhesive may peel off due to the stress acting on the bonded part. Therefore, in this embodiment, as a means for solving the adhesion peeling due to the difference in the linear expansion coefficient described above, the adhesive pool portions 16a and 17a provided in the nail portions 16 and 17 are filled with an adhesive and the nail is filled. The parts 16 and 17 and the light shielding plate 3 are bonded and fixed. When the environmental temperature rises, the plastic optical housing 10 has a force S that tends to extend greatly in the Y-axis direction, and the extension of the stainless steel light shielding plate 3 in the Y-axis direction is smaller than the optical housing 10.
- the claw parts 16 and 17 have some elasticity in the Y-axis direction, so And the expansion of the gap between the adhesive pools 16a and 17a can be suppressed. For this reason, the adhesive reservoirs 16a and 17a are filled. The stress acting on the adhesive is relaxed and peeling of the adhesive can be suppressed.
- the light shielding plate fixing method of this embodiment is effective.
- the optical housing 10 is provided with the claw portions 16 and 17, but the light shielding plate 3 may be provided with the claw portions 16 and 17.
- the light shielding plate 3 may not be made of metal. However, considering the strength required to ensure light shielding accuracy (positional accuracy of the light shielding plate), metals such as stainless steel are preferable.
- the light shielding plate 3 is not subjected to non-reflective coating on the surface. Instead, the light-shielding plate as in Embodiment 3 is angled so that the reflected light Rg1 to Rg4 from the first traveling lens 1 is shielded by the light-shielding plate 3 and does not go to the photoconductor again. You may take measures such as. However, the reflection light R g 1 to R g 4 shielded by the light shielding plate 3 may not be directed to the re-scanning lens 1 by applying a non-reflective coating to the light shielding plate 3. In all the embodiments described above, a rotating polygon mirror is used as a deflector. However, a deflector of a type that does not rotate (but rotates) such as a galvano mirror may be used.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Mechanical Optical Scanning Systems (AREA)
- Facsimile Scanning Arrangements (AREA)
- Laser Beam Printer (AREA)
- Facsimile Heads (AREA)
Description
Claims
Priority Applications (1)
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US11/341,858 US7355771B2 (en) | 2004-08-05 | 2006-01-30 | Optical scanning apparatus |
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JP2004-229189 | 2004-08-05 | ||
JP2004229189 | 2004-08-05 | ||
JP2005-222903 | 2005-08-01 | ||
JP2005222903A JP4845448B2 (ja) | 2004-08-05 | 2005-08-01 | 光学走査装置 |
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US11/341,858 Continuation US7355771B2 (en) | 2004-08-05 | 2006-01-30 | Optical scanning apparatus |
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WO2006014023A1 true WO2006014023A1 (ja) | 2006-02-09 |
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PCT/JP2005/014789 WO2006014023A1 (ja) | 2004-08-05 | 2005-08-05 | 光学走査装置 |
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US (1) | US7355771B2 (ja) |
JP (1) | JP4845448B2 (ja) |
WO (1) | WO2006014023A1 (ja) |
Cited By (1)
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JP2016151719A (ja) * | 2015-02-19 | 2016-08-22 | 京セラドキュメントソリューションズ株式会社 | 光走査装置及び画像形成装置 |
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JP2005345719A (ja) | 2004-06-02 | 2005-12-15 | Canon Inc | 光走査装置及びそれを用いた画像形成装置 |
JP4944432B2 (ja) * | 2005-11-30 | 2012-05-30 | キヤノン株式会社 | 光走査装置及びそれを用いた画像形成装置 |
JP4818070B2 (ja) * | 2006-10-31 | 2011-11-16 | キヤノン株式会社 | 走査式光学装置及び画像形成装置 |
JP5171029B2 (ja) * | 2006-12-26 | 2013-03-27 | キヤノン株式会社 | 光走査装置及びそれを用いた画像形成装置 |
US8233209B2 (en) * | 2007-01-31 | 2012-07-31 | Ricoh Company, Limited | Optical scanning device and image forming apparatus |
JP5483805B2 (ja) * | 2007-05-01 | 2014-05-07 | キヤノン株式会社 | 光走査装置及びそれを用いた画像形成装置 |
JP5106033B2 (ja) * | 2007-10-16 | 2012-12-26 | キヤノン株式会社 | 光走査装置及びそれを用いた画像形成装置 |
JP2010049061A (ja) * | 2008-08-22 | 2010-03-04 | Canon Inc | 光走査装置及びそれを用いた画像形成装置 |
US8218014B2 (en) * | 2009-07-30 | 2012-07-10 | Microvision, Inc. | Electromagnetic scanner having variable coil width |
JP6108850B2 (ja) | 2013-01-30 | 2017-04-05 | キヤノン株式会社 | 走査光学装置及びそれを備えた画像形成装置 |
JP6203111B2 (ja) * | 2014-04-24 | 2017-09-27 | 株式会社東芝 | 画像形成装置 |
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Also Published As
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JP2006072339A (ja) | 2006-03-16 |
US7355771B2 (en) | 2008-04-08 |
US20060164709A1 (en) | 2006-07-27 |
JP4845448B2 (ja) | 2011-12-28 |
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