WO2016084594A1 - 光走査装置及びそれを備えた画像形成装置 - Google Patents
光走査装置及びそれを備えた画像形成装置 Download PDFInfo
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- WO2016084594A1 WO2016084594A1 PCT/JP2015/081587 JP2015081587W WO2016084594A1 WO 2016084594 A1 WO2016084594 A1 WO 2016084594A1 JP 2015081587 W JP2015081587 W JP 2015081587W WO 2016084594 A1 WO2016084594 A1 WO 2016084594A1
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- WIPO (PCT)
- Prior art keywords
- laser light
- light source
- insertion hole
- optical scanning
- scanning device
- Prior art date
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Classifications
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/04—Apparatus for electrographic processes using a charge pattern for exposing, i.e. imagewise exposure by optically projecting the original image on a photoconductive recording material
- G03G15/04036—Details of illuminating systems, e.g. lamps, reflectors
- G03G15/04045—Details of illuminating systems, e.g. lamps, reflectors for exposing image information provided otherwise than by directly projecting the original image onto the photoconductive recording material, e.g. digital copiers
- G03G15/04072—Details of illuminating systems, e.g. lamps, reflectors for exposing image information provided otherwise than by directly projecting the original image onto the photoconductive recording material, e.g. digital copiers by laser
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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
-
- 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
- G02B26/123—Multibeam scanners, e.g. using multiple light sources or beam splitters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/024—Details of scanning heads ; Means for illuminating the original
- H04N1/028—Details of scanning heads ; Means for illuminating the original for picture information pick-up
- H04N1/02815—Means for illuminating the original, not specific to a particular type of pick-up head
- H04N1/0282—Using a single or a few point light sources, e.g. a laser diode
- H04N1/0283—Using a single or a few point light sources, e.g. a laser diode in combination with a light deflecting element, e.g. a rotating mirror
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
- H04N1/06—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using cylindrical picture-bearing surfaces, i.e. scanning a main-scanning line substantially perpendicular to the axis and lying in a curved cylindrical surface
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
- H04N1/113—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using oscillating or rotating mirrors
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/23—Reproducing arrangements
- H04N1/29—Reproducing arrangements involving production of an electrostatic intermediate picture
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G2215/00—Apparatus for electrophotographic processes
- G03G2215/01—Apparatus for electrophotographic processes for producing multicoloured copies
- G03G2215/0103—Plural electrographic recording members
- G03G2215/0119—Linear arrangement adjacent plural transfer points
- G03G2215/0122—Linear arrangement adjacent plural transfer points primary transfer to an intermediate transfer belt
- G03G2215/0125—Linear arrangement adjacent plural transfer points primary transfer to an intermediate transfer belt the linear arrangement being horizontal or slanted
- G03G2215/0132—Linear arrangement adjacent plural transfer points primary transfer to an intermediate transfer belt the linear arrangement being horizontal or slanted vertical medium transport path at the secondary transfer
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N2201/00—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof
- H04N2201/0077—Types of the still picture apparatus
- H04N2201/0091—Digital copier; digital 'photocopier'
Definitions
- the present invention relates to an optical scanning device that scans a laser beam and writes and forms an image, and an image forming apparatus including the same, which are used in image forming apparatuses such as printers, copiers, and facsimiles.
- optical scanning is performed by scanning a surface of a photosensitive drum uniformly charged by a charging device with laser light modulated based on input image data. Equipped with equipment.
- the electrostatic latent image formed by the optical scanning device is developed into a toner image by a developing device, and further, an image forming process is performed in which the toner image is transferred to a recording paper or the like and is made a permanent image by a fixing device.
- the optical scanning device includes a laser light source (LD) that emits a laser beam for writing an electrostatic latent image, an optical system that scans the rotation axis direction (main scanning direction) of the photosensitive drum while reflecting the emitted laser beam, A housing for storing them, and a light source substrate attached to the housing are provided.
- the optical scanning device writes an electrostatic latent image on the surface of the photosensitive drum by laser light scanned by an optical system.
- LD laser light source
- Patent Document 1 discloses an optical scanning device that includes four laser light sources, an optical system that scans the laser light, and four light source substrates that control the outputs of the laser light sources, respectively.
- Patent Document 2 discloses an optical scanning device that includes four laser light sources, an optical system that scans laser light, and a single light source substrate that controls the outputs of the four laser light sources. .
- the LD terminals (leads) are attached while extending in a straight line, the LD is formed on the substrate.
- the interval between the long hole-like terminal insertion holes is narrowed, and it becomes difficult to form a copper layer (land) on the substrate. Therefore, it is necessary to widen the interval between the terminal insertion holes by forming (bending) the LD terminals in advance.
- the incidence rate of electrostatic breakdown, cracks, broken wire bonding, etc. of the LD increases. Therefore, there is a desire to reduce the forming locations as much as possible.
- the present invention reduces the number of locations where LD terminals are formed as much as possible, makes it easy to form a copper layer on a substrate, and reduces the number of components and simplifies the assembly process.
- An object of the present invention is to provide a scanning device and an image forming apparatus including the same.
- a first configuration of the present invention includes a housing, a plurality of laser light sources, and a substrate, and scans the surface to be scanned with laser light emitted from the laser light sources. It is.
- the plurality of laser light sources are attached to the side wall of the housing with three terminals protruding outward.
- the substrate is disposed opposite to the outer surface of the side wall of the housing, and a terminal insertion hole into which a terminal of the laser light source is inserted is formed.
- the laser light source includes a first laser light source having a predetermined angle with respect to the substrate, and a second laser light source having an angle with respect to the substrate that is symmetric with respect to the first laser light source. Only one of the terminals is bent in a direction away from the other two, and the second laser light source is a laser light source having the same configuration as that of the first laser light source, inverted by 180 °. .
- the same component is used for the first laser light source having a predetermined angle with respect to the substrate and the second laser light source having an angle with respect to the substrate that is symmetrical to the first laser light source.
- the first laser light source and the second laser light source only one of the three terminals is bent in a direction away from the other two. Therefore, it is possible to secure the interval between the terminal insertion holes necessary for forming the copper layer while suppressing the occurrence rate of electrostatic breakdown, cracks, wire bonding breakage, and the like.
- FIG. 1 is a schematic diagram showing the overall configuration of a tandem color image forming apparatus 100 on which an optical scanning device 4 of the present invention is mounted.
- FIG. 2 is a plan view showing the internal structure of the optical scanning device 4 according to an embodiment of the present invention.
- FIG. 3 is a side sectional view showing the internal structure of the optical scanning device 4.
- FIG. 4 is a perspective view of the side wall 48b of the housing 48 to which the laser light sources 40a to 40d are attached.
- FIG. 5 is a perspective view of the light source insertion hole 50d formed in the side wall 48b.
- FIG. 6 is a cross-sectional view of the light source insertion hole 50d formed in the side wall 48b.
- FIG. 7 is a plan view of the substrate 70 attached to the side wall 48b.
- FIG. 8 is a side view of the substrate 70 into which the terminals 53a to 53c of the laser light sources 40a to 40d are inserted.
- FIG. 9 is a plan view of the laser light source 40a viewed from the terminals 53a to 53c side.
- FIG. 10 is a cross-sectional view showing a state in which the flange portion 51b of the laser light source 40b (40c) is held at the step portion of the press-fit portion 55 of the light source insertion hole 50b (50c).
- FIG. 11 is a cross-sectional view showing a state in which the laser light source 40b (40c) is press-fitted and fixed to the press-fit portion 55 of the light source insertion hole 50b (50c).
- FIG. 12 is a cross-sectional view showing a state in which the laser light source 40a is press-fitted and fixed to the press-fit portion 55 of the light source insertion hole 50a.
- FIG. 13 is a cross-sectional view showing a state in which the laser light source 40d is press-fitted and fixed to the press-fit portion 55 of the light source insertion hole 50d.
- FIG. 14 is a plan view showing a state in which the laser light source 40b (40c) is press-fitted and fixed to the press-fit portion 55 of the light source insertion hole 50b (50c).
- FIG. 15 is a perspective view showing a state in which the laser light source 40a is press-fitted and fixed to the press-fit portion 55 of the light source insertion hole 50a.
- FIG. 16 is a perspective view showing a state in which the laser light source 40d is press-fitted and fixed to the press-fit portion 55 of the light source insertion hole 50d.
- FIG. 17 is a front view showing a state in which the laser light sources 40a to 40d are press-fitted and fixed in the light source insertion holes 50a to 50d.
- FIG. 18 is a cross-sectional view showing a state in which the laser light sources 40a to 40d are press-fitted and fixed in the light source insertion holes 50a to 50d.
- FIG. 19 is an enlarged view of the terminal insertion hole 73 a formed in the substrate 70.
- FIG. 1 is a schematic cross-sectional view of an image forming apparatus 100 on which an optical scanning device 4 of the present invention is mounted.
- a tandem color image forming apparatus is shown.
- four image forming portions Pa, Pb, Pc, and Pd are sequentially arranged from the upstream side in the transport direction (the right side in FIG. 1).
- These image forming portions Pa to Pd are provided corresponding to images of four different colors (cyan, magenta, yellow, and black), and cyan, magenta, and yellow are respectively performed by charging, exposure, development, and transfer processes. And a black image are sequentially formed.
- These image forming portions Pa to Pd are provided with photosensitive drums 1a, 1b, 1c and 1d which carry visible images (toner images) of the respective colors. Further, an intermediate transfer belt 8 that is rotated clockwise in FIG. 1 by a driving means (not shown) is provided adjacent to each of the image forming portions Pa to Pd.
- the toner images formed on the photosensitive drums 1a to 1d are sequentially transferred onto the intermediate transfer belt 8 that moves while contacting the photosensitive drums 1a to 1d, and then transferred onto the transfer paper at the secondary transfer roller 9. Transferred onto P at once. Further, after being fixed on the transfer paper P in the fixing unit 7, it is discharged from the apparatus main body. While the photosensitive drums 1a to 1d are rotated in the counterclockwise direction in FIG. 1, an image forming process for the photosensitive drums 1a to 1d is executed.
- the transfer paper P onto which the toner image is transferred is accommodated in a paper cassette 16 at the lower part of the apparatus, and is conveyed to the secondary transfer roller 9 via the paper feed roller 12a and the registration roller pair 12b.
- a sheet made of dielectric resin is used for the intermediate transfer belt 8, and a (seamless) belt mainly having no seam is used.
- the image forming units Pa to Pd will be described.
- the photosensitive drums 1a to 1d rotatably arranged, there are chargers 2a, 2b, 2c and 2d for charging the photosensitive drums 1a to 1d, and image information to the photosensitive drums 1a to 1d.
- the optical scanning device 4 for exposing the toner, the developing units 3a, 3b, 3c and 3d for forming toner images on the photosensitive drums 1a to 1d, and the developer (toner) remaining on the photosensitive drums 1a to 1d are removed.
- Cleaning parts 5a, 5b, 5c and 5d are provided.
- the surfaces of the photosensitive drums 1a to 1d are uniformly charged by the chargers 2a to 2d, and then the laser beam is irradiated by the optical scanning device 4 to each photosensitive drum. Electrostatic latent images corresponding to image signals are formed on 1a to 1d.
- Each of the developing units 3a to 3d is filled with a predetermined amount of cyan, magenta, yellow, and black toner by a replenishing device (not shown).
- the toner is supplied onto the photosensitive drums 1a to 1d by the developing units 3a to 3d, and is electrostatically attached to the toner image corresponding to the electrostatic latent image formed by exposure from the optical scanning device 4. Is formed.
- the intermediate transfer belt 8 is stretched between an upstream conveying roller 10 and a downstream driving roller 11.
- the transfer paper P is adjacent to the intermediate transfer belt 8 from the registration roller pair 12b at a predetermined timing.
- the full color image formed on the intermediate transfer belt 8 is transferred onto the transfer paper P by being conveyed to the provided secondary transfer roller 9.
- the transfer paper P onto which the toner image is transferred is conveyed to the fixing unit 7.
- the transfer paper P transported to the fixing unit 7 is heated and pressurized by the fixing roller pair 13 so that the toner image is fixed on the surface of the transfer paper P and becomes a permanent image.
- the transfer paper P on which the full-color image is fixed in the fixing unit 7 is distributed in the transport direction by the branching unit 14 that branches in a plurality of directions. When an image is formed on only one side of the transfer paper P, it is discharged as it is onto the discharge tray 17 by the discharge roller pair 15.
- FIG. 2 is a plan view showing the internal configuration of the optical scanning device 4 according to an embodiment of the present invention
- FIG. 3 is a side sectional view showing the internal configuration of the optical scanning device 4 of the present embodiment (AA ′ in FIG. 2).
- FIG. 2 the description of the plane mirrors 49a to 49c is omitted.
- the optical scanning device 4 has a housing 48, and a polygon mirror 45 is disposed at a substantially central portion of the bottom surface 48 a of the housing 48.
- the polygon mirror 45 is composed of a regular hexagonal rotary polygon mirror having six deflection surfaces (reflection surfaces) 45 a on the side surface, and is rotated at a predetermined speed by the polygon motor 38.
- the polygon motor 38 is fixed to a motor support plate 39, and the motor support plate 39 is fixed to the bottom surface 48a.
- the laser light sources 40a to 40d are disposed on the side wall 48b on the front side (the lower side in FIG. 2) of the housing 48.
- the laser light sources 40a to 40d are composed of LDs (laser diodes), and emit laser beams (beam beams) D1 to D4 light-modulated based on image signals.
- collimator lenses 41 provided corresponding to the respective laser light sources 40a to 40d and laser beams D1 to D4 that have passed through the collimator lenses 41 are predetermined.
- Two folding mirrors 44 that lead to 45 deflection surfaces 45a are arranged.
- the collimator lens 41 converts the laser beams D1 to D4 emitted from the laser light sources 40a to 40d into substantially parallel light beams, and the cylindrical lens 43 has a predetermined refractive power only in the sub-scanning direction (vertical direction in FIG. 3). Is.
- the first scanning lenses 46a and 46b and the second scanning lenses 47a, 47b, 47c, and 47d are arranged to face each other with the polygon mirror 45 interposed therebetween.
- the first scanning lenses 46a and 46b and the second scanning lenses 47a to 47d have f ⁇ characteristics, and the laser beams D1 to D4 deflected and reflected by the polygon mirror 45 are applied to the photosensitive drums 1a to 1d (see FIG. 1).
- plane mirrors 49a to 49c are arranged on the optical paths of the laser beams D1 to D4 from the polygon mirror 44 to the photosensitive drums 1a to 1d (see FIG. 1).
- the laser beams D1 and D2 emitted from the laser light sources 40a and 40b are made into a substantially parallel light beam by the collimator lens 41, and have a predetermined optical path width by the aperture 42.
- the laser beams D ⁇ b> 1 and D ⁇ b> 2 that are substantially parallel light beams are incident on the cylindrical lens 43.
- the laser beams D1 and D2 incident on the cylindrical lens 43 are converged and emitted in the sub-scanning direction in the state of a parallel light beam in the main scanning section, and are formed as a line image on the deflection surface 45a of the polygon mirror 45. .
- the laser beams D1 and D2 are incident on the deflection surface 45a at different angles in the sub-scanning direction. Is configured to do.
- the laser beams D1 and D2 incident on the polygon mirror 45 are deflected at a constant angular velocity by the polygon mirror 45 and then deflected at a constant velocity by the first scanning lens 46a.
- the laser beams D1 and D2 that have passed through the first scanning lens 46a are folded a predetermined number of times by the plane mirrors 49a and 49b disposed in the respective optical paths, the laser beam D1 is sent to the second scanning lens 47a, and the laser beam D2 is the second beam.
- the light enters the scanning lens 47b and is deflected at a constant speed by the second scanning lenses 47a and 47b.
- the laser beams D1 and D2 deflected at the same speed are folded back by the final plane mirror 49c disposed in the respective optical paths, and the windows 60a and 60b formed on the upper surface cover 60 covering the opening of the housing 48 are passed through.
- the light passes through and is distributed to the photosensitive drums 1a and 1b.
- the laser beams D3 and D4 emitted from the laser light sources 40c and 40d pass through the collimator lens 41, the aperture 42, and the cylindrical lens 43, and then are deflected at an equal angle by the polygon mirror 45, and then by the first scanning lens 46b. Constant velocity deflection. Then, after being folded back by the flat mirrors 49a and 49b, the laser beam D3 is deflected at a constant speed by the second scanning lens 47c, and the laser beam D4 is deflected by the second scanning lens 47d. Further, the light is folded back by the final flat mirror 49c, and light is distributed from the window portions 60c and 60d formed on the upper surface cover 60 to the photosensitive drums 1c and 1d.
- FIG. 4 is a perspective view of the side wall 48b of the housing 48 to which the laser light sources 40a to 40d are attached.
- four light source insertion holes 50a to 50d to which the four laser light sources 40a to 40d are respectively fixed are formed in the side wall 48b of the housing 48.
- the side wall 48b has screw holes 57a to 57d into which screws (not shown) for fixing the board 70 (see FIG. 7) to the side wall 48b are screwed, and protrudes outside the side wall 48b.
- Two positioning bosses 59a and 59b for positioning are formed at predetermined positions.
- FIG. 5 and 6 are a perspective view and a cross-sectional view of the light source insertion hole 50d formed in the side wall 48b, respectively
- FIG. 7 is a plan view of the substrate 70 mounted on the side wall 48b
- FIG. 8 is a laser light source 40a.
- FIG. 9 is a plan view of the laser light source 40a seen from the terminals 53a to 53c side.
- 5 and 6 illustrate the configuration of the light source insertion hole 50d, the light source insertion holes 50a to 50c have the same configuration.
- the laser light source 40d has the same configuration as the laser light source 40a, and the laser light sources 40b and 40c have the same configuration as the laser light source 40a except that the terminal 53b is not formed.
- the light source insertion holes 50a to 50d have a large diameter portion 55a having a larger diameter than the flange portion 51b (see FIG. 8) of the laser light sources 40a to 40d and a small diameter portion 55b having a smaller diameter than the flange portion 51b.
- the laser light sources 40a to 40d include a cylindrical main body portion 51a from which laser light is emitted, a flange portion 51b that protrudes like a bowl from the outer peripheral surface of the main body portion 51a, and a flange portion. It is composed of three terminals 53a to 53c protruding substantially vertically from the lower surface of 51b.
- a rectangular first recess 51ba is formed at one location on the peripheral edge of the flange 51b.
- a triangular second recess 51bb is formed at a position 45 ° apart on both sides of the first recess 51ba.
- one of the three terminals 53a to 53c (terminal 53b) is formed. (Bending) is processed.
- the arrangement shown in FIG. 9 with the first recess 51ba in the vertical upward direction (straight line L1 direction) and the second recess 51bb in the horizontal direction (straight line L2 direction) is the reference position.
- the terminal 53b is formed in a direction inclined by an angle ⁇ (here, 23 °) from the horizontal direction due to a restriction of a jig for forming the terminal 53b.
- the substrate 70 for controlling the outputs of the four laser light sources 40a to 40d is fixed to the side wall 48b so as to face the outside of the side wall 48b.
- the substrate 70 is for controlling the outputs of the four laser light sources 40a to 40d.
- an electronic component 71 such as an IC chip, a resistor, and a capacitor is mounted on the substrate 70.
- terminal insertion holes 73a to 73d into which the terminals 53a to 53c of the four laser light sources 40a to 40d are inserted and fixed to the substrate 70, and four screw insertion holes 75a to 75d into which screws are inserted.
- 75d and two boss insertion holes 77a and 77b with which the positioning bosses 59a and 59b of the side wall 48b of the housing 48 are engaged are formed.
- the boss insertion hole 77a into which the positioning boss 59a is inserted is an oblong hole that is flat in the horizontal direction
- the boss insertion hole 77b into which the positioning boss 59b is inserted is a round hole.
- the terminal insertion holes 73b and 73c into which the terminals 53a to 53c of the two inner laser light sources 40b and 40c are inserted are formed in a round hole shape having a diameter slightly larger than the diameter of the terminals 53a to 53c.
- the terminal insertion holes 73a and 73d into which the terminals 53a to 53c of the two outer laser light sources 40a and 40d are inserted the terminals 53a to 53c of the laser light sources 40a and 40d protruding obliquely from the flange portion 51b can be easily inserted.
- it is formed in a long hole shape (see FIG. 19).
- a copper layer called a land is provided around the terminal insertion holes 73a to 73d of the substrate 70 so that soldering can be performed from the direction opposite to the insertion direction of the terminals 53a to 53c (front side in FIG. 7). (Not shown) is formed.
- This copper layer may be formed by etching a copper foil, or may be formed by a plating method.
- FIG. 10 is a cross-sectional view showing a state in which the flange portion 51b of the laser light source 40b (40c) is held in the stepped portion of the press-fit portion 55 of the light source insertion hole 50b (50c)
- FIGS. 11 to 13 show the laser light source 40b ( 40c)
- 40a, and 40d are cross-sectional views showing a state in which the light source insertion holes 50b (50c), 50a, 50d are press-fitted and fixed
- FIG. 14 shows the laser light source 40b (40c) in the light source insertion holes 50b (50c).
- 16 are perspective views showing states in which the laser light sources 40a and 40d are press-fitted and fixed in the press-fitting portions 55 of the light source insertion holes 50a and 50d, respectively.
- 17 and 18 are a front view and a cross-sectional view showing a state where the laser light sources 40a to 40d are press-fitted and fixed in the light source insertion holes 50a to 50d, respectively.
- the four laser light sources 40a to 40d are press-fitted and fixed to the four light source insertion holes 50a to 50d, respectively, with the terminal 53 facing the outside of the side wall 48b.
- the positions of the concave portions 51 ba of the flange portions 51 b and the convex portions 56 of the press-fit portions 55 are aligned, and the flange portions 51 b of the laser light sources 40 b and 40 c are inserted into the press-fit portions 55.
- the flange portion 51b of the press-fit portion 55 is smaller than the outer diameter of the flange portion 51b, the flange portion 51b is held by a step portion between the large-diameter portion 55a and the small-diameter portion 55b. Thereby, the flange part 51b is hold
- the laser light sources 40a and 40d are also inserted into the press-fit portions 55 of the light source insertion holes 50a and 50d, and the flange portion 51b is held by the step portion between the large diameter portion 55a and the small diameter portion 55b.
- the flange portion 51b is press-fitted and fixed to the small diameter portion 55b while maintaining the parallel state of the flange portion 51b and the side wall 48b. be able to. That is, by temporarily placing the flange portion 51b at the step portion between the large diameter portion 55a and the small diameter portion 55b of the press-fit portion 55, the side wall 48b and the flange portion 51b can be press-fitted while being held in parallel.
- the cross section which passes along 2nd recessed part 51bb of the flange part 51b is shown in figure.
- the four laser light sources 40a to 40d are press-fitted and fixed to the light source insertion holes 50a to 50d from the outside of the housing 48 so that the terminals 53a to 53c protrude outward from the side wall 48b.
- the inner two laser light sources 40b and 40c are arranged at substantially the same height
- the outer two laser light sources 40a and 40d are substantially the same height higher than the laser light sources 40b and 40c. Is arranged.
- the two outer laser light sources 40a and 40d have a predetermined angle (inclination) with respect to the substrate 70 around the vertical line O (see FIGS. 15 and 16), respectively, and the substrate of the laser light source 40d.
- the angle with respect to 70 is symmetrical with the laser light source 40a.
- the laser light source 40d (second laser light source) inserted into the light source insertion hole 50d is inverted by 180 ° from the laser light source 40a (first laser light source) inserted into the light source insertion hole 50a. Is used.
- the substrate 70 is attached to the side wall 48b from the outside.
- the flange portion 51b at the step portion between the large diameter portion 55a and the small diameter portion 55b, the inclination when the laser light sources 40a to 40d are press-fitted is suppressed. Therefore, the variation in the protruding positions of the terminals 53a to 53c is also reduced. As a result, the terminals 53a to 53c can be smoothly inserted into the terminal insertion holes 73a to 73d of the board 70.
- the laser light source 40a is inserted into the light source insertion hole 50a so that the first recess 51ba faces downward, and the light source insertion hole 50a is counterclockwise by an angle ⁇ (23 °) from the perpendicular O.
- a convex portion 56 is formed at a position shifted in the rotation direction.
- the laser light source 40a is formed by fitting the first concave portion 51ba to the convex portion 56.
- the terminal 53b is mounted on the side wall 48b so that the front end of the terminal 53b faces in the horizontal direction (left direction in FIG. 15).
- the horizontal direction (right direction in FIG. 15) is the same as the inclination angle of the laser light source 40a with respect to the side wall 48b regardless of the rotation of the flange portion 51b. Protrusively inclined. Therefore, all the three terminals 53a to 53c of the laser light source 40a protrude with their tip portions directed in the horizontal direction.
- the laser light source 40d is inserted into the light source insertion hole 50d so that the first recess 51ba faces upward, and the light source insertion hole 50d is opposite to the perpendicular O by an angle ⁇ (23 °).
- a convex portion 56 is formed at a position shifted in the clockwise direction.
- the laser light source 40d is mounted with the laser light source 40a rotated by 180 °, and the three terminals 53a to 53c of the laser light source 40d also protrude with their tip portions directed in the horizontal direction.
- FIG. 19 is an enlarged view of the terminal insertion hole 73a (inside the broken line in FIG. 7) formed in the substrate 70.
- the terminal insertion hole 73a includes a first insertion hole 73aa into which the terminal 53a is inserted, a second insertion hole 73ab into which the terminal 53b is inserted, and a third insertion hole 73ac into which the terminal 53c is inserted.
- the first insertion hole 73aa to the third insertion hole 73ac are each formed in a long hole shape extending in the same direction (horizontal direction).
- the first insertion hole 73aa to the third insertion hole 73ac have the same longitudinal dimension A1 (about 1.6 mm).
- the dimension A2 in the direction orthogonal to the longitudinal direction is the same (about 0.8 mm) for the first insertion hole 73aa and the third insertion hole 73ac, but the second insertion hole 73ab has a variation in the forming process of the terminal 53b. In consideration of this, it is slightly larger (about 1 mm) than the first insertion hole 73aa and the third insertion hole 73ac.
- the terminal insertion hole 73d into which the terminals 53a to 53d of the laser light source 40d are inserted is obtained by rotating the terminal insertion hole 73a (first insertion hole 73aa to third insertion hole 73ac) shown in FIG. 19 by 180 °. Since it is a thing, description is abbreviate
- 73ac is also formed in an elongated hole shape extending in the horizontal direction. Therefore, it is easy to align the terminals 53a to 53c and the first insertion holes 73aa to the third insertion holes 73ac.
- the second insertion hole 73ab into which the terminal 53b is inserted can be separated from the first insertion hole 73aa and the third insertion hole 73ac.
- the distance G between the second insertion hole 73ab and the third insertion hole 73ac can be secured (about 0.45 mm) as compared with the case where the terminal 53b is not formed, and the copper layer (land) of the substrate 70 can be secured. Is also easy to form.
- the board 70 is further moved to the side wall 48b side, so that the two positioning bosses 59a and 59b (see FIG. 4) are inserted into the boss insertion holes of the board 70. Insert into 77a, 77b.
- substrate 70 is positioned by the surface direction (parallel direction with the side wall 48b). The substrate 70 is positioned in the insertion direction by contacting the peripheral edge portions of the light source insertion holes 50a to 50d and the screw holes 57a to 57d.
- the board 70 is fixed to the side wall 48b by inserting screws into the screw insertion holes 75a to 75d (see FIG. 7) of the board 70 and screwing them into the screw holes 57a to 57d (see FIG. 4) of the side wall 48b.
- the laser light sources 40a to 40d are electrically connected to the substrate 70 by soldering the terminals 53a to 53d of the laser light sources 40a to 40d to the copper layer of the substrate 70. In this manner, the laser light sources 40 a to 40 d and the substrate 70 are fixed to the housing 48.
- the terminal 53b is formed in a direction away from the terminals 53a and 53c.
- the distance G between the first insertion hole 73ab, the third insertion hole 73ac and the second insertion hole 73ab constituting the terminal insertion holes 73a and 73d is set.
- the spacing can be sufficient for forming the copper layer (land).
- the laser light source 40d (second laser light source) inserted into the light source insertion hole 50d is used by inverting the laser light source 40a (first laser light source) inserted into the light source insertion hole 50a by 180 °. Therefore, the number of parts can be reduced, and the assembly workability can be further improved.
- the flange portion 51b of the laser light sources 40a to 40d is temporarily held by the step portion between the large diameter portion 55a and the small diameter portion 55b, and then the flange portion 51b is press-fitted into the small diameter portion 55b, whereby the flange portion 51b is inserted into the side wall 48b. Can be pressed into the light source insertion holes 50a to 50d while being held in parallel. Therefore, the laser light sources 40a to 40d can be quickly and accurately attached to the housing 48.
- the terminals 53a to 53c of the laser light sources 40a and 40d are all in the horizontal direction. Protrusively. Therefore, alignment with the first insertion hole 73aa to the third insertion hole 73ac formed in the substrate 70 becomes easy.
- the optical scanning device 4 shown in the above embodiments is configured to emit laser beams D1 to D4 from the upper surface of the housing 48 and irradiate the upper photosensitive drums 1a to 1d. 1d may be disposed below the optical scanning device 4, and the laser beams D1 to D4 may be emitted from the lower surface of the housing 48.
- the polygon mirror 45 is disposed substantially at the center of the housing 48, and the laser beams D1 and D2, D3 and D4 are deflected in opposite directions.
- a polygon mirror 45 may be arranged at one end of 48 to separate the laser beams D1 to D4 in the sub-scanning direction while deflecting in the same direction.
- the present invention can be used for an optical scanning device that is used in an image forming apparatus such as a printer, a copying machine, and a facsimile machine, which scans a laser beam to write and form an electrostatic latent image.
- an optical scanning device and an image forming apparatus including the same which can reduce the number of locations where the LD leads are formed, reduce the number of components, and simplify the assembly process.
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
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- General Physics & Mathematics (AREA)
- Mechanical Optical Scanning Systems (AREA)
- Facsimile Scanning Arrangements (AREA)
- Laser Beam Printer (AREA)
Abstract
Description
Claims (6)
- ハウジングと、
前記ハウジングの側壁に3本の端子が外側に突出した状態で取り付けられる複数のレーザー光源と、
前記ハウジングの側壁の外面に対向配置され、前記レーザー光源の端子が挿入される端子挿入穴が形成される基板と、
を備え、前記レーザー光源から射出されるレーザー光によって被走査面上を走査する光走査装置であって、
前記レーザー光源は、前記基板に対して所定の角度を有する第1レーザー光源と、前記基板に対する角度が前記第1レーザー光源と対称である第2レーザー光源と、を含み、
前記第1レーザー光源は、3本の前記端子のうち1本のみが他の2本から離間する方向に折り曲げ加工されており、前記第2レーザー光源は、前記第1レーザー光源と同一の構成の前記レーザー光源を180°反転させて配置したものである光走査装置。 - 前記第1レーザー光源及び前記第2レーザー光源は、レーザー光が射出される円筒状の本体部と、該本体部の外周面から鍔状に突出するフランジ部とを有し、前記ハウジングの側壁には、前記フランジ部よりも大径の大径部と、前記フランジ部よりも小径の小径部と、が側壁の外側から順に形成された2段構造の圧入部を有する光源挿入孔が形成される請求項1に記載の光走査装置。
- 前記第1レーザー光源及び前記第2レーザー光源は、3本の前記端子の先端部がいずれも水平方向を向くように前記ハウジングの側壁に取り付けられる請求項1に記載の光走査装置。
- 前記基板には、前記第1レーザー光源及び前記第2レーザー光源の3本の前記端子が挿入される第1挿入穴、第2挿入穴、第3挿入穴で構成される端子挿入穴が形成されており、前記第1挿入穴、前記第2挿入穴、前記第3挿入穴はいずれも水平方向に延びる長穴状に形成される請求項3に記載の光走査装置。
- 前記第1挿入穴、前記第2挿入穴、前記第3挿入穴のうち、折り曲げ加工された前記端子が挿入される前記第2挿入穴は、前記第1挿入穴および前記第3挿入穴に比べて長手方向と直交する方向の寸法が大きい請求項4に記載の光走査装置。
- 請求項1に記載の光走査装置が搭載された画像形成装置。
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JP2008180873A (ja) * | 2007-01-24 | 2008-08-07 | Canon Inc | 光学走査装置 |
JP2011187448A (ja) * | 2011-04-18 | 2011-09-22 | Fuji Xerox Co Ltd | 光源装置、光走査装置、及び画像形成装置 |
JP2013222165A (ja) * | 2012-04-19 | 2013-10-28 | Ricoh Co Ltd | 光走査装置、画像形成装置、及び光走査装置の組立方法 |
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JP4231011B2 (ja) | 2005-02-21 | 2009-02-25 | 京セラミタ株式会社 | 画像形成装置 |
JP4862597B2 (ja) * | 2006-10-10 | 2012-01-25 | 富士ゼロックス株式会社 | 接続部材、電気基板、光走査装置、及び画像形成装置 |
JP5038239B2 (ja) * | 2008-06-30 | 2012-10-03 | 株式会社リコー | 光走査装置及び画像形成装置 |
JP5149860B2 (ja) | 2009-04-28 | 2013-02-20 | シャープ株式会社 | 光源ユニット、光源装置、光走査装置及び画像形成装置 |
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JP2013222165A (ja) * | 2012-04-19 | 2013-10-28 | Ricoh Co Ltd | 光走査装置、画像形成装置、及び光走査装置の組立方法 |
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