Patent Grant
7515171
This application claims priority under 25 U.S.C. § 119(a) from Korean Patent Application No. 10-2007-0012219, filed on Feb. 6, 2007 in the Korean Intellectual Property Office, the disclosure of which is incorporated herein in its entirety by reference.
1. Field of the Invention
The present general inventive concept relates to a light scanning module and an image forming apparatus having the same, and more particularly, to a light scanning unit having an improved configuration to clean a light scanning window thereof and an image forming apparatus having the same.
2. Description of the Related Art
A conventional image forming apparatus prints an image on a printing medium corresponding to a printing signal applied from a host apparatus. The image forming apparatus is provided as a printer which prints the image data on the printing medium to be visible, a facsimile which transmits the image data to an external apparatus, a photocopier which copies the image data on plural printing media, and a multifunctional printer which includes the above-described functions.
The conventional image forming apparatus generally comprises a feeding part which stores a printing medium, an image forming part which forms an image on a printing medium fed from the feeding part, and a discharging part which discharges the printing medium on which the image is formed to the outside. Here, the image forming part comprises a developing unit having a photosensitive body which spreads developer onto the printing medium, and a light scanning unit which scans a beam onto the photosensitive body to form an electrostatic latent image thereon. The light scanning unit comprises a light source which generates light, a casing which accommodates the light source, and a light scanning window which is provided in the casing for the beam to penetrate to the photosensitive body.
Here, the image forming apparatus may experience a situation where the developer separated from the photosensitive body is not spread onto the printing medium to be scattered in the inside of the main body while forming the image on the printing medium. If the developer scattered inside the main body, dust of the printing medium, and other foreign substances are adhered to the light scanning window of the light scanning unit, an optical route is interfered, to thereby depreciate a printing quality. Accordingly, the image forming apparatus is required to clean the foreign substance spread on the light scanning window.
In Japanese First Patent Publication 2005-329622, is disclosed a configuration to clean the foreign substance of the light scanning window. As illustrated in
However, the conventional cleaning shutter 30 has a problem that a large frictional force between the light scanning window 21 and the cleaning member 33 resists the driving force of the driving part (not illustrated) to slow down a returning speed of the cleaning shutter 30 if the cleaning shutter 30 moves from the opening position to the closing position when a frictional force generated by contact between the cleaning member 33 and the light scanning window 21 is provided to be large so as to improve a cleaning efficiency.
Furthermore, a cleaning efficiency problem occurs when reducing the frictional force between the light scanning window 21 and the cleaning member 33, during the time when the cleaning shutter 30 moves from the closing position to the opening position to solve the above problem.
The present general inventive concept provides a light scanning module which has an improved configuration of a cleaning shutter so that frictional force between a cleaning member and a light scanning window can differently operate when the cleaning shutter moves from an opening position to a closing position and from the closing position to the opening position, and an image forming apparatus having the same.
Additional aspects and utilities of the present general inventive concept will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present general inventive concept.
The foregoing and/or other aspects and utilities of the present general inventive concept can be achieved by providing a light scanning module which is mounted to a main body, the module including a light scanning unit which has a light scanning window and scans a light onto a photosensitive body of the main body a cleaning shutter part which has a cleaning part to clean the light scanning window and is coupled to the main body to move between an opening position to open the light scanning window and a closing position to close the light scanning window, and the cleaning shutter part, including a cleaning part accommodating part to accommodate at least one area of the cleaning part to pivotally rotate, and a rotation regulating part which is provided on one side of the cleaning part and is contact-supported on an internal wall of the cleaning part accommodating part to block the pivotal rotation of the cleaning part if the cleaning shutter part moves from the closing position to the opening position, and is separated from the internal wall of the cleaning part accommodating part to permit the rotation of the cleaning part if the cleaning shutter part moves from the opening position to the closing position.
The cleaning part may include a cleaning part main body of which one area is rotatably accommodated in the cleaning part accommodating part; and a cleaning member which is provided in a lower part of the cleaning part main body and is interfered with the light scanning window to clean a surface of the light scanning window.
The rotation regulating part may include a rotating shaft which is provided in the cleaning part main body and accommodated in the cleaning part accommodating part, and a supporting projection which is projected in an area of a radiating direction of the rotating shaft, and is contacted with and separated from the internal wall of the cleaning part accommodating part according to the movement of the cleaning shutter part.
The cleaning part main body and the rotating shaft may be provided to be integrated with each other.
The supporting projection may be provided to have a length to contact with an opposite wall of the cleaning part accommodating part so that an angle in which a rotation of the rotational shaft is permitted from a position where the rotational shaft is rotation-blocked by the supporting projection is 90° or less.
The cleaning part accommodating part may include an opening which exposes the cleaning member.
The cleaning member may be provided as one of a sponge, a brush, a fiber, and an elastic member.
The light scanning unit may include a cleaning rib which contacts with the cleaning member and cleans the cleaning member if the cleaning shutter part is in the closing position.
The cleaning rib may be disposed in a diagonal direction with respect to the moving direction of the cleaning shutter.
The cleaning rib may be provided plurally, and the interval among the plural cleaning ribs is provided so that a line according to the moving direction of the cleaning shutter can be on a line linking an end part of a first cleaning rib and an opposite end part of a second cleaning rib adjacent to the first cleaning rib.
The cleaning rib may be provided to be parallel or transverse with respect to the moving direction of the cleaning shutter.
The foregoing and/or other aspects and utilities of the present general inventive concept may also be achieved by providing an image forming apparatus, including a main body, an image forming part which is provided in the main body and has a photosensitive body spreading developer on a printing medium, a light scanning module which scans a light onto the photosensitive body, and a feeding part to feed a printing medium to the image forming part.
The main body may include a driving part to apply a driving force to the cleaning shutter so that the cleaning shutter can move between the opening position and the closing position.
The driving part may include a rotation driving part to transmit a driving force generated in the driving force generating part, and a movement converting part to convert the rotating movement of the rotation driving part into a linear movement of the cleaning shutter.
The rotation driving part may be provided as a gear, and the movement converting part may be provided as a gear stud which is coupled to the rotation driving part and contact-pressurizes the cleaning shutter.
The main body may include a casing, and a door which is provided in the casing to pivotally rotate, and the cleaning shutter is coupled to the door so as to move between the opening position and the closing position in engagement with the rotating movement of the door.
The image forming apparatus may further include a link member which is provided between the door and the cleaning shutter and may convert the rotating movement of the door into a linear movement of the cleaning shutter.
The light scanning unit may include a cleaning rib to contact with the cleaning member and to clean the cleaning member if the cleaning shutter part is in the closing position.
The above and/or other aspects and utilities of the present general inventive concept will become apparent and more readily appreciated from the following description of the exemplary embodiments, taken in conjunction with the accompanying drawings of which:
Reference will now be made in detail to the embodiments of the present general inventive concept, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout. The exemplary embodiments are described below so as to explain the present general inventive concept by referring to the figures.
As illustrated in
The image forming part 100 spreads developer on the printing medium to form an image thereon. The image forming part 100 may be classified into a mono type in which a black-and-white image is formed, and a color type in which a color image is formed by using four colors of developer such as yellow Y, magenta M, cyan C and black B. Also, the color type image forming part 100 can be classified into a single-pass type which has a light scanning unit 300 corresponding to a number of the photosensitive body 111, and a multi-pass type which has a smaller number of light scanning units 300 than a number of photosensitive bodies 111.
The image forming part 100 according to an exemplary embodiment of the present general inventive concept will be described as a single-pass type, but may be provided in other types. The image forming part 100 comprises a developing unit 110 to spread developer to a printing medium, a transfer roller 120 to apply a transfer voltage to the printing medium to transfer the developer on a surface of the photosensitive body 111 to the printing medium, and a printing medium transfer belt part 130 to transfer the printing medium to the developing unit 110 and the transfer roller 120.
The developing unit 110 comprises the photosensitive body 111 on which the developer is spread, an electrifying roller 114 to electrify a surface of the photosensitive body 111 to a predetermined electric potential, a developer transfer body 112 to supply the developer to the photosensitive body 111, a developer storing part 117 to store the developer, a supplying roller 113 to supply the developer in the developer storing part 117 to the developer transfer body 112, a cleaning member 116 to clean developer remaining on the surface of the photosensitive body 111 having transferred the developer to the printing medium, and a static electricity cleaning part 115 to uniformly clean the electric potential on the surface of the photosensitive body 111.
The developing unit 110 is provided plurally according to various colors of the developer stored in its inside. That is, the developing unit 110 is provided plurally to have four colors, such as yellow Y, magenta M, cyan C, and black B. A description of a configuration of the developing unit will be omitted as it is the same as the conventional configuration.
The transfer roller 120 applies a predetermined transfer voltage on a rear surface of the printing medium transferred to a printing medium transfer belt 131 to enable the developer spread on the photosensitive body 111 to be transferred on a surface of the printing medium. The transfer roller 120 applies a voltage of a polarity opposite to a polarity of the developer to enable the developer to be separated from the photosensitive body 111 to be transferred to the printing medium.
The printing medium transfer belt part 130 comprises a printing medium transfer belt 131 to attach the printing medium on its surface by using static electricity and to sequentially transfer the printing medium to each of the developing units 110, and a driving roller 133 to drive the printing medium transfer belt 131.
The exposure part 200 according to an embodiment of the present general inventive concept comprises the light scanning unit 300 to scan a beam to the photosensitive body 111 of each of the developing units 110 to form an electrostatic latent image on the surface of the photosensitive body 111, and a cleaning shutter part 400 which is provided on one side of the light scanning unit 300 to clean a light scanning window 311 of the light scanning unit 300.
The light scanning unit 300 comprises a light source part (not illustrated) to generate a light, a polygon mirror assembly 330, a reflection mirror 360, a plurality of optical holes 340 and a casing 310 to support the above components. The light source part (not illustrated) comprises a light source (not illustrated) to generate and scan a light and a regulating lens (not illustrated) to regulate the scanned light source (not illustrated) to be parallel with an optical axis. The polygon mirror assembly 330 comprises a polygon mirror 331 which is provided with a plurality of reflection surfaces, and a driving part 333 to rotate the polygon mirror 331 of a high speed and a uniform velocity.
The plurality of optical holes 340 comprise a cylindrical lens (not illustrated) and a scanning lens (not illustrated). The cylindrical lens (not illustrated) is disposed between the light source part (not illustrated) and the polygon mirror 331 to regulate the light scanned by the light source part (not illustrated) to converge in a sub-scanning direction. The polygon mirror 331 is rotated at a high speed by the driving part 333 to receive the light having passed through the cylindrical lens and reflects the light to form a predetermined angle of view. The scanning lens (not illustrated) regulates the light reflected by the polygon mirror 331 to converge in a main scanning direction. The reflection mirror 360 reflects the light having passed through the scanning lens in a predetermined direction to ultimately form an image on the photosensitive body 111.
As illustrated in
The light scanning window 311 is provided in a position where the light reflected from the reflection mirror 360 faces the photosensitive body 111. As illustrated in
A shutter coupling boss 313 is coupled to the cleaning shutter part 400 so that the cleaning shutter part 400 (to be described later) can move between a closing position to close the light scanning window 311 and an opening position to open the light scanning window 311. The shutter coupling boss 313 is accommodated in a guide rail 455 of the cleaning shutter part 400 to support a reciprocating movement of the cleaning shutter part 400. The shutter coupling boss 313 is provided to correspond to a shape and size of the guide rail 455.
The elastic member hook 315 is coupled to the elastic member 445 along with an elastic member coupling part 440 of the cleaning shutter part 400. A detailed description of the elastic member hook 315 will be made along with a description of the elastic member 445.
As illustrated in
The cleaning rib 317a is provided to have a height high enough to contact the cleaning member 427 by a predetermined length, and enables the foreign substance on the surface of the cleaning member 427 to be separated by interference of an area where the cleaning rib 317a contacts with the cleaning member 427 if the cleaning shutter part 400 moves.
As illustrated in
As illustrated in
Referring to
As illustrated in
The shutter main body 410 comprises a light scanning slit 411 which is formed through the shutter main body 410 in a position corresponding to the light scanning window 311 and through which the light is scanned, and a shutter pressing rib 413 which is provided in one end part of the shutter main body 410 to contact with a cleaning shutter driving part 500 to enable the cleaning shutter part 400 to move between the opening position and the closing position by the cleaning shutter driving part 500. The light scanning slit 411 is provided to correspond to a size and shape of the light scanning window 311.
The shutter pressing rib 413 may be provided in various types according to a driving method and shape of the cleaning shutter driving part 500. As illustrated in
The shutter pressing rib 413 may be assembled with a link member (not illustrated) to transmit a pivotal rotation of a door (not illustrated) to enable the shutter main body 410 to move if the cleaning shutter driving part 500 is provided to move in engagement with the opening and the closing of the door of the image forming apparatus 1.
As illustrated in
The cleaning main body 421 is coupled to the lower side of the shutter main body 410 to support the cleaning member 427. As illustrated in
Meanwhile, the rotational shaft 423 includes a supporting projection 425 which is projected along a radiating direction of the rotational shaft 423. The supporting projection 425 contacts an internal wall of the cleaning part accommodating part 430 to block the rotation of the rotational shaft 423 if the shutter main body 410 moves from the closing position to the opening position, and the supporting projection 425 is separated from the internal wall of the cleaning part accommodating part 430 to permit the rotation of the rotational shaft 423 if the shutter main body 410 moves from the opening position to the closing position.
As illustrated in
As illustrated in
Meanwhile, as illustrated in
The cleaning member 427 is extended from the cleaning main body 421 to contact with the light scanning window 311 and to clean the foreign substance of the surface of the light scanning window 311. The cleaning member 427 may be provided as a member capable of generating a frictional force with the light scanning window 311 while moving. The cleaning member 427 may be provided as a brush shape, a sponge type, and a combination of plural fibers. The length of the cleaning member 427 may be provided so that contacting area with the light scanning window 311 can be maximum if the shutter main body 410 moves from the closing position to the opening position, and it may be provided to be inserted into the cleaning part accommodating part 430 by the rotation of the rotational shaft 423 so that the contacting area with the light scanning window 311 can be minimized if the shutter main body 410 moves from the opening position to the closing position.
The cleaning member 427 may be provided not to have a contacting area with the light scanning window 311 if the shutter main body 410 moves from the opening position to the closing position considering the diameter of the rotational shaft 423 and the position of the supporting projection 425.
The cleaning shutter part 400 has been described corresponding to a configuration where the cleaning shutter part 400 is provided above the light scanning unit 300 as a reference in an exemplary embodiment of the present general inventive concept, and the rotational direction of the rotational shaft 423 can be changed according to the position of the light scanning unit 300 and the cleaning shutter part 400.
The elastic member coupling part 440 supports the elastic member 445 along with the elastic member hook 315 of the light scanning unit 300. The elastic member coupling part 440 and the elastic member hook 315 support an end part and an opposite end part of the elastic member 445, respectively, and supply a frictional force so that the shutter main body 410 can move to the closing position at a high speed if the shutter main body 410 moves from the opening position to the closing position.
As illustrated in
If the printing signal is removed in the opening position, a motor 510 rotates and the pressure of the gear stud 530 which has pressurized the shutter pressing rib 413 disappears. Accordingly, the elastic member 445 operates on an elastic force so as to return to the initial position, and the shutter main body 410 moves to the closing position at a high speed by the elastic force. Accordingly, since the frictional force between the cleaning member 427 and the light scanning window 311 becomes minimized to produce no force to resist the elastic force, the shutter main body 410 can move by a minimum force. Here, the returning speed of the shutter main body 410 can be regulated by an elastic coefficient of the elastic member 445.
The cleaning shutter driving part 500 moves the cleaning shutter part 400 from the closing position to the opening position according to a control signal of a controller (not illustrated) if the printing signal is applied. The cleaning shutter driving part 500 comprises the motor 510 which rotates according to the control signal of the controller (not illustrated), the gear 520 which rotates in engagement with the motor 510, and the gear stud 530 which is coupled to the gear 520 and converts the rotational movement of the gear 520 into a linear movement of the shutter main body 410.
In general, a DC motor can be used for the motor 510, and the gear 520 is used as a unit to transmit the rotational force of the motor 510. However, other driving means can be used to transmit the rotational force of the motor 510 in addition to the gear 520. The gear stud 530 moves along a rotational radius of the gear 520 according to the rotation of the gear 520. Accordingly, the gear stud 530 contacts with the shutter pressing rib 413 of the shutter main body 410 and transmits the rotational force of the gear 520 to enable the shutter main body 410 to move from the closing position to the opening position.
The moving radius of the gear stud 530 corresponds to the rotational radius of the gear 520. Also, the moving radius of the gear stud 530 corresponds to the moving distance of the shutter main body 410.
As illustrated in
A configuration to clean the light scanning window 311 of the image forming apparatus 1 with this configuration according to an embodiment of the present general inventive concept will be described by referring to
First, if the printing signal is applied, the controller (not illustrated) supplies power to the motor 510. The gear stud 530 moves according to the rotation of the motor 510 to pressurize the shutter pressing rib 413.
As illustrated in
Accordingly, the rotational shaft 423 rotates counterclockwise by the rotational moment generated by the contact of the light scanning window 311 and the cleaning member 427, and the supporting projection 425 is supported on the internal wall of the cleaning part accommodating part 430 to block the rotation of the rotational shaft 423. If the rotation of the rotational shaft 423 is blocked, the cleaning member 427 moves while maintaining a maximum contacting area ‘a’ with the light scanning window 311. That is, the cleaning member 427 maintains the maximal frictional force to clean the light scanning window 311.
Meanwhile, after the shutter main body 410 moves to the opening position, the shutter main body 410 maintains the opening position by the pressure of the gear stud 530, and the image forming part 100 forms an image on the printing medium.
If the image forming is completed, the motor 510 re-rotates and the gear stud 530 rotates to remove the pressure with respect to the shutter pressing rib 413. Accordingly, the elastic member 445 expanded from the initial length between the elastic member coupling part 440 and the elastic member hook 315 applies an elastic force to the shutter main body 410 so as to return to the initial length.
As illustrated in
Accordingly, a resisting force generated between the light scanning window 311 and the cleaning member 427 becomes minimized with respect to a restoring force in which the elastic member 445 restores the shutter main body 410 to the closing position, so that the shutter main body 410 can rapidly move.
A cleaning shutter according to the above-described exemplary embodiment of the present general inventive concept has a configuration to clean a light scanning window if a shutter main body moves from a closing position to an opening position, but a large frictional force may be applied to clean the light scanning window if the shutter main body moves from the opening position to the closing position, and a small frictional force may be applied if the shutter main body moves from the closing position to the opening position, as necessary.
As described above, the present general inventive concept provides a light scanning module to regulate an interfering amount between a cleaning member and a light scanning window to improve a returning speed of a cleaning-completed cleaning shutter, and the image forming apparatus having the light scanning module.
Also, a cleaning rib is provided to remove a foreign substance of the cleaning member in the light scanning unit to maintain and control the cleaning member cleanly, thereby improving its durability.
Although a few exemplary embodiments of the present general inventive concept have been shown and described, it will be appreciated by those skilled in the art that changes may be made in these exemplary embodiments without departing from the principles and spirit of the general inventive concept, the scope of which is defined in the
| Number | Date | Country | Kind |
|---|---|---|---|
| 10-2007-0012219 | Feb 2007 | KR | national |
| Number | Name | Date | Kind |
|---|---|---|---|
| 5689769 | Appel et al. | Nov 1997 | A |
| 7203444 | Yamazaki | Apr 2007 | B2 |
| 7277655 | Namba | Oct 2007 | B2 |
| 7330295 | Sowa et al. | Feb 2008 | B2 |
| 7352377 | Matsutomo | Apr 2008 | B2 |
| Number | Date | Country |
|---|---|---|
| 2001-253112 | Sep 2001 | JP |
| 2005-246901 | Sep 2005 | JP |
| 2005-329622 | Dec 2005 | JP |
| 1998-56625 | Oct 1998 | KR |
| 2005-108058 | Nov 2005 | KR |
| Number | Date | Country | |
|---|---|---|---|
| 20080187350 A1 | Aug 2008 | US |
