JP3409201B2 - Exposure equipment for image forming machines - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exposure device installed in an image forming machine such as an electrostatic copying machine or an electrostatic printing machine.

[0002]

2. Description of the Related Art An exposure apparatus for an image forming machine is equipped with a light source for exposing a document, an exposure slit, and a mirror for projecting a reflected light projected from a document surface through an exposure slit in a predetermined direction. A moving frame body, a second moving frame body equipped with a mirror that projects reflected light emitted from a mirror mounted on the first moving frame body in a predetermined direction, and a second moving frame body mounted on the second moving frame body A stationary mirror for projecting the reflected light projected from the reflected mirror onto the photosensitive surface of the photosensitive drum, and an optical lens unit arranged between the second moving frame and the stationary mirror. .

In the thus constructed exposure apparatus, the optical lens unit is configured to be reciprocally movable in the optical axis direction in order to change the projection magnification to enable the reduction magnification and the enlargement magnification to be copied. There is. In an exposure apparatus having a so-called variable magnification function capable of changing the projection magnification as described above, when the optical lens unit is moved in the optical axis direction, the distribution of the image light amount on the photosensitive surface of the photosensitive drum is slit exposed. It becomes non-uniform in the longitudinal direction of the region. That is, when the optical lens unit is moved away from the original image in order to form a reduced electrostatic latent image on the photosensitive surface of the photosensitive drum, the distribution of the image light amount on the photosensitive surface becomes longer than the slit exposure area. The amount of light increases on both sides of the direction. Therefore, when forming a reduced image, the left and right sides of the transfer image (corresponding to both sides in the longitudinal direction of the slit exposure region) are brighter than the normal-size image. When the optical lens unit is moved so as to approach the original image in order to form a magnified electrostatic latent image on the photosensitive surface of the photosensitive drum, the distribution of the image light amount on the photosensitive surface becomes longer than the slit exposure area. Light intensity decreases on both sides of the direction.
For this reason, when forming a magnified image, the left and right sides of the transferred image are darker than the same-size image. In order to correct such a change in the distribution of the image light amount on the photosensitive surface due to the movement of the optical lens unit in the optical axis direction, in an exposure apparatus having a variable magnification function, the projection light amount is adjusted to the slit exposure area. A light amount correction means for equalizing in the longitudinal direction is provided. This light quantity correction means is provided with a light quantity correction plate which is arranged on the front side or the rear side of the lens and whose left and right sides are formed high. The light quantity correction plate corresponds to the movement of the optical lens unit in the optical axis direction. It is configured to move in the radial direction with respect to the center.

On the other hand, in the above-mentioned exposure apparatus, the optical lens unit must be arranged between the contact glass on which the original is placed and the photosensitive drum, in parallel with them and at right angles to the optical axis of the reflected light. So-called one-sided focus occurs. In order to prevent the occurrence of this one-sided focus, the optical lens unit is configured so that the lens frame on which the lens is mounted can be rotated around the positioning vertical axis to adjust the mounting angle (direction of the lens center). .

The above-mentioned optical lens unit comprises a lens pedestal movably arranged in the optical axis direction and a lens mounted on a lens frame arranged on the lens pedestal, and the lens frame is a lens. The light amount correction plate is attached to the lens pedestal so as to be vertically movable, while being mounted to the pedestal so as to be rotatable about a vertical axis for positioning. The light amount correction plate mounted on the lens pedestal can be moved in the vertical direction by moving on the inclined surface of the inclined guide member arranged in the moving direction of the optical lens unit.

The light quantity correction plate is long in the vertical direction so as to be supported so as to be movable in the vertical direction.
Equipped with one long hole. Then, by mounting two guide pins, which are respectively arranged through the two elongated holes, on the lens pedestal, the light amount correction plate moves on the inclined surface of the inclined guide member. It is adapted to move up and down while being guided by two guide pins. It should be noted that, in order to facilitate the vertical movement of the light amount correction plate, a light amount correction plate holding member is provided on both sides of the light amount correction plate in the guide pin insertion portion.

[0007]

Since the light quantity correcting plate is mounted on the lens receiving base, the lens frame is positioned to adjust the mounting angle of the lens arranged on the lens receiving base. If the rotational adjustment is performed around the vertical axis, the distance between the light amount correction plate and the lens changes on the left and right sides.
When the relative positional relationship between the light amount correction plate and the lens changes in this way, there is a problem in that there is a difference in light amount correction on both sides in the longitudinal direction of the slit exposure area.

Further, in order to move the light amount correction plate up and down, a gap is required between the light amount correction plate holding member,
If a catch occurs during contact with the tilt guide member when the tilt guide member moves on the tilt surface, the catch causes the tilt guide member to tilt forward or backward.
When the light amount correction plate is tilted to the front side or the rear side, twisting occurs between the light amount correction plate and the light amount correction plate sandwiching member, and smooth vertical movement of the light amount correction plate is impaired. If the light amount correction plate does not move smoothly, the driving load for moving the optical lens unit in the optical axis direction increases, and a large load is applied to the moving motor of the optical lens unit. In particular, when the moving motor is a stepping motor, if a large load acts on it, the motor will lose step (the motor will not rotate smoothly), and as a result, there will be a problem in that the lens will be misaligned and the magnification will be lost. . In addition, the tendency of the light amount correction plate to tilt is that the larger the raising / lowering stroke of the light amount correction plate is in order to improve the light amount correction effect,
The position of the guide pin becomes far more noticeable because it is separated from the inclined surface of the inclined guide member. As described above, there is a mechanical problem in the light amount correction by raising and lowering the light amount correction plate, and it has not been possible to achieve sufficient light amount correction.

The present invention has been made in view of the above facts, and the first technical problem is that the mounting angle of the lens can be adjusted while maintaining the relative positional relationship between the light amount correction plate and the lens. An exposure device of an image forming machine is provided.

A second technical problem is to provide an exposure device of an image forming machine which can smoothly operate the light amount correction plate in response to the movement of the optical lens unit in the optical axis direction. .

[0011]

In order to solve the above-mentioned first technical problem, according to the present invention, an optical lens unit is configured to be capable of reciprocating along an optical axis along a guide rail, In an exposure device of an image forming machine that exposes a document image on a photosensitive surface of a photoconductor through a lens unit, the optical lens unit includes a lens pedestal configured to be reciprocally movable along the guide rail, and the lens pedestal. , A lens center adjustment base arranged so as to be rotatable and fixed around a positioning vertical axis, a lens mounted on the lens center adjustment base, and a diameter attached to the lens center adjustment base with respect to the lens center. A light amount correction plate configured to be movable in a direction, and a pair of inclined guide members that are arranged in parallel with the guide rail and each include an inclined surface. The light amount correction plate is placed on a slope, and the light amount correction plate moves along the inclined surfaces of the pair of inclined guide members as the lens receiving base reciprocates along the guide rail. An exposure apparatus of an image forming machine is provided, wherein a correction plate is moved in a radial direction with respect to the center of the lens.

In order to solve the above-mentioned second technical problem, according to the present invention, the optical lens unit is configured to be reciprocally movable along the guide rail in the optical axis direction, and the original image is passed through the optical lens unit. In an exposure device of an image forming machine for exposing the photosensitive surface of a photoreceptor to light, the optical lens unit is disposed on the lens receiving base configured to be reciprocally movable along the guide rail. It is equipped with a lens and a pair of light amount correction plates that are swingably supported by a pair of support shafts mounted on the lens pedestal in the optical axis direction, and are parallel to the optical axis direction of the lens pedestal. A pair of inclined guide members each having an inclined surface, and the pair of light amount correction plates are respectively mounted on the inclined surfaces of the pair of inclined guide members, and the guide rails of the lens receiving table are provided. Optical axis along The pair of light amount correction plates move along the inclined surfaces of the pair of tilt guide members in accordance with the reciprocal movement in the direction, whereby the pair of light amount correction plates are swung around the pair of support shafts. An exposure device for an image forming machine is provided.

Further, in order to solve the above first and second technical problems, according to the present invention, the optical lens unit is configured to be reciprocally movable along the guide rail in the optical axis direction, and the optical lens unit is configured. In an exposure device of an image forming machine that exposes a document image on a photosensitive surface of a photoconductor through the optical lens unit, the optical lens unit is configured to be reciprocally movable along the guide rail, and is positioned on the lens receiver. Lens center adjustment base arranged to be rotatable and fixed around a vertical axis, a lens mounted on the lens center adjustment base, and a pair of spindles mounted on the lens center adjustment base in the optical axis direction A pair of light amount correction plates that are each swingably supported by a pair of tilt guide members, each of which is provided in parallel with the guide rail and has a tilted surface. The pair of light amount correction plates are respectively mounted on the inclined surfaces of the guide members, and the pair of light amount correction plates are attached to the inclined surfaces of the pair of inclined guide members in accordance with the reciprocating movement of the lens receiving base along the guide rails. There is provided an exposure device for an image forming machine, characterized in that the pair of light amount correction plates are swung around the pair of support shafts by moving along the axis. Other features of the present invention will be clarified by the following description.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An exposure apparatus for an image forming machine constructed according to the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 shows an electrostatic copying machine as an image forming machine equipped with an embodiment of an exposure apparatus constructed according to the present invention. The illustrated electrostatic copying machine includes a body housing 2 having a rectangular parallelepiped shape. A contact glass 3 on which an original to be copied is placed, and an openable document pressing plate 4 for covering the contact glass 3 and the original placed on the contact glass 3 are arranged on the upper surface of the machine housing 2. Has been done. An exposure device 5 is arranged below the contact glass 3. The exposure device 5 includes a first moving body 6 that is reciprocally moved in the horizontal direction (left-right direction in FIG. 1) along the contact glass 3, and the first moving body 6.
The reciprocating direction of the first moving body 6 (see FIG.
In the left-right direction) of 1 / movement speed of the first moving body 6
Second moving body 7 configured to reciprocate at a speed of 2
And a stationary mirror group 8 and an optical lens unit 9 arranged between the second moving body 7 and the stationary mirror group 8.

An irradiation lamp 61 for irradiating an original placed on the contact glass 3 is provided on the first moving body 6.
A reflection plate 62 for reflecting the light of the irradiation lamp 61 on the document placed on the contact glass 3, the exposure slit 63 and the light reflected from the document surface through the exposure slit 63 in the direction indicated by the arrow P. A first mirror 64 for projecting light is provided.

A second mirror 7 is attached to the second moving body 7.
First and third mirrors 72 are provided, and the first
The reflected light projected in the direction indicated by the arrow P by the mirror 64 of the second mirror 71 and the third mirror 72.
The light is projected in the direction indicated by arrow Q.

The stationary mirror group 8 includes a fourth mirror 81.
And a fifth mirror 82 and a sixth mirror 83. The third mirror 72 projects the light in the direction indicated by the arrow Q and reflects the reflected light passing through the optical lens unit 9 into a fourth light. Mirror 81, fifth mirror 82 and sixth
The photoconductor drum 1 is sequentially reflected through the mirror 83 of
Light is projected on the photosensitive surface of 0.

The optical lens unit 9 is reciprocally movable in the optical axis direction (left and right in FIG. 1) so that the projection magnification can be changed. The optical lens unit 9 will be described in detail later.

The photosensitive drum 10 is rotatably arranged in the machine housing 2. This photosensitive drum 10
Is driven to rotate in the direction indicated by the arrow by a driving means (not shown). Around the photosensitive drum 10, the charging corona discharger 1 is sequentially seen when seen in the rotation direction indicated by the arrow.
1, a developing device 12, a transfer corona discharger 13, a peeling corona discharger 14, a cleaning unit 15, and a charge eliminating lamp 16 are provided.

Further, the illustrated electrostatic copying machine is equipped with a transfer paper supply device 20 for supplying a transfer paper to a transfer area between the transfer corona discharger 13 and the photosensitive drum 10, and A transfer paper transport belt mechanism 22 is provided on the transfer paper delivery side of the transfer area.

In the electrostatic copying machine constructed as described above, the charging corona discharger 11 identifies the photoconductor on the photoconductor drum 10 while the photoconductor drum 10 is rotationally driven in the direction indicated by the arrow. The original is placed on the contact glass 3 by the irradiation lamp 61, and the reflected light image is reflected by the exposure slit 63, the first mirror 64, and the second mirror 71. Third mirror 7
2. The photosensitive drum 10 is scanned and exposed through the optical lens unit 9, the fourth mirror 81, the fifth mirror 82, and the sixth mirror 83 to form an electrostatic latent image on the photosensitive drum 10. To be done. After that, the electrostatic latent image on the photosensitive drum 10 is developed into a toner image by the developing device 12. On the other hand, the transfer paper conveyed to the transfer area by the transfer paper supply device 20 is the photosensitive drum 10 on which the toner image is formed.
The toner image is transferred by passing between the transfer corona discharger 13 and the transfer corona discharger 13. Then, the transfer paper on which the toner image has been transferred is separated from the photoconductor drum 10 by the action of the separating corona discharger 14, and the transfer paper conveying belt mechanism 22.
Is conveyed to a fixing device (not shown), is heated and fixed there, and is discharged to a discharge tray from a pair of discharge rollers (not shown). Further, the cleaning unit 15 removes the toner adhering to the outer peripheral surface of the photosensitive drum 10 that has undergone the transfer process as described above.
The charge eliminating lamp 16 irradiates the surface of the photoconductor with the charge eliminating light to eliminate the charge.

Next, an embodiment of the optical lens unit 9 will be described with reference to FIGS. The optical lens unit 9 includes a lens pedestal 91.
The lens pedestal 91 is formed in a rectangular shape and has a cutout recess 91a in the center. This lens cradle 91
Both ends (upper and lower ends in FIG. 2) are movably mounted on a pair of guide rails 92, 92 extending in the optical axis direction shown by the arrow Q in the body housing 2. The lens pedestal 91 configured as described above can be reciprocated in the left-right direction in FIG. 2 by the lens moving means 93.

The lens moving means 93 includes a stepping motor 931 as a driving source and the stepping motor 93.
No. 1 reduction gear 932, a drive pulley 933 attached to the output shaft of the reduction gear 932, and a pair of pulleys 934, 93 arranged along the guide rail 92.
5 and the wire type transmission means 937 composed of the endless wire 936 wound around the pulleys 934 and 935 after being wound around the drive pulley 933 once, and the endless wire 936 is connected to the lens receiving base 91. Is connected to one end (upper end in FIG. 2) of the.

A lens center adjusting base 94 is arranged on a lens receiving base 91 which can be reciprocated in the left-right direction in FIG. 2 by the lens moving means 93. The lens center adjustment base 94 is, as shown in FIG.
1 is provided with a hole 94a corresponding to the positioning vertical axis 911 provided upright in the central portion of the No. 1 and by fitting the hole 94a into the positioning vertical axis 911, the positioning vertical axis 911 is centered. It is configured to be rotatable. Further, the lens center adjustment base 94 includes a mounting flange portion 94b bent downward on the left side (on the side of the third mirror 72) in FIG. 5, and a circle centered on the positioning vertical axis 911. An arc-shaped elongated hole 94c is formed. A fixing screw 95 inserted into an elongated hole 94c provided in the lens center adjusting base 94 is screwed into a screw hole provided in the lens receiving base 91. When the fixing screw 95 is loosened, the lens center adjusting base 94 can be rotated around the positioning vertical axis 911, and the lens center adjusting base 94 is fixed to the lens receiving base 91 by tightening the fixing screw 95. be able to. A lens frame 97 in which a lens 96 is mounted on the lens center adjustment base 94.
Is provided. This lens frame 97 has a plurality of screws 9.
It is mounted on the lens center adjustment base 94 by 8.

On the mounting flange portion 94b of the lens center adjusting base 94, a light quantity correcting plate 101 which constitutes a light quantity correcting means 100 is mounted. This light quantity correction plate 101
Is a cutout recess 101a at the center of the upper part as shown in FIG.
Is formed, and a mounting portion 101b that is bent substantially horizontally is provided at the bottom. Further, the light quantity correction plate 101 includes two guide holes 101c that are long in the vertical direction,
The guide holes 101c and 101c are provided.
The mounting flange portion 9 is inserted by the guide pins 102, 102 inserted through the mounting flange portion 94b into the mounting flange portion 94b.
It is attached to 4b so as to be vertically movable. Correction plate sandwiching members 103, 103 fitted to the guide pins 102, 102 are arranged on both sides of the light amount correction plate 101.

Below the light quantity correction plate 101, a pair of inclined guide members 105, 105 are arranged in parallel with the pair of guide rails 92, 92 which constitute the light quantity correction means 100 together with the light quantity correction plate 101. The pair of tilt guide members 105 and 105 are arranged on a base 25 provided in the body housing 2, and on the upper surface thereof descend from the right side to the left side as shown in FIG. 3 (lens 96).
Side toward the third mirror 72 side) inclined surface 1
05a and 105a are formed respectively. The pair of inclined guide members 105 and the inclined surface 105a of the 105
And the mounting portion 10 of the light quantity correction plate 101 on 105a.
1b is placed. Therefore, when the optical lens unit 9 reciprocates on the pair of guide rails 92, 92, the light amount correction plate 101 causes the pair of inclined guide members 105 and 105.
It can be moved up and down by sliding on the inclined surfaces 105a and 105a.

The exposure apparatus of the image forming machine in the illustrated embodiment is configured as described above, and its operation will be described below. When adjusting the mounting angle of the lens 96, the fixing screw 95 is loosened, and the lens center adjustment base 94 is rotated about the positioning vertical axis 911, and the lens mounting angle is adjusted while comparing the images on the front side and the rear side. After the adjustment, the fixing screw 95 is tightened to fix the lens center adjustment base 94 to the lens receiving base 91. At this time, the lens frame 97 on which the lens 96 is mounted is positioned as shown by the chain double-dashed line in FIG.
The light amount correction plate 101 that configures 0 is the lens center adjustment base 94
Since it is mounted on the mounting flange portion 94b of FIG. 6, the light quantity correction plate 101 is also adjusted by adjusting the lens mounting angle.
Are positioned as indicated by the chain double-dashed line at.
Therefore, even if the lens mounting angle is adjusted, the light quantity correction plate 10
The relative positional relationship between 1 and the lens 96 does not change, and the light amount correction plate 101 and the lens 96 can always be maintained in a predetermined relative positional relationship.

Next, a case where the lens 96 is moved in the optical axis direction based on the setting information of the magnification change will be described. When a drive signal of a predetermined number of steps is output to the stepping motor 931 by the control means (not shown) in accordance with the setting information of the scaling ratio, the driving force of the stepping motor 931 is reduced by the reduction gear 932 and the drive pulley 933. The endless wire 936, which is transmitted between the endless wires 936 and 935 and is connected to one end of the lens receiving base 91, is moved leftward or rightward in FIG. Therefore, the lens pedestal 91 can be moved leftward or rightward on the pair of guide rails 92, 92 extending in the optical axis direction in FIGS. 2 and 3. The lens cradle 91 is moved to the right in FIGS. 2 and 3 when the projection magnification is reduced, and is moved to the left in FIGS. 2 and 3 when the projection magnification is enlarged.

When the lens receiving base 91 is moved in the direction of reducing the projection magnification (rightward in FIGS. 2 and 3), the light quantity correcting plate 101 mounted on the center adjusting base 94 mounted on the lens receiving base 91. Is the guide pin 1 while sliding on the inclined surfaces 105a and 105a of the pair of inclined guide members 105.
It is guided by 02 and 102 and moved upward. Accordingly, the projection light amount in the longitudinal direction of the slit exposure region is regulated by the light amount correction plate 101 having the notch concave portion 101a in the upper center which is radially raised toward the lens center on the front side of the lens 96.

On the other hand, when the lens pedestal 91 is moved in the direction in which the projection magnification is enlarged (to the left in FIGS. 2 and 3), the light amount correction plate 101 moves on the inclined surfaces 105a and 105a of the pair of inclined guide members 105. While sliding, it is guided by the guide pins 102, 102 and moved downward.
Therefore, the projection light amount regulated by the light amount correction plate 101 decreases.

In the exposure apparatus shown in FIGS. 1 to 6, the light quantity correction plate 101 is provided on the upstream side of the projection light of the lens 96,
That is, although the example in which the light amount correction plate 101 is provided on the third mirror 72 side is shown, the light amount correction plate 101 may be provided on the downstream side of the projection light of the lens 96, that is, the fourth mirror 81 side.

Next, another embodiment of the exposure device of the image forming machine will be described with reference to FIGS. 7 and 8. The exposure apparatus shown in FIGS. 7 and 8 is substantially the same as the above embodiment except for the configuration of the light amount correction plate and its mounting structure, and therefore, the same members are designated by the same reference numerals,
Detailed description is omitted. In the present embodiment, the light amount correction means 200 includes a pair of light amount correction plates 201, 201. In the pair of light amount correction plates 201, 201, the inner upper edges facing each other are formed low, and the outer upper edges are formed high. In addition, the pair of light amount correction plates 20
Mounting portions 201a and 201a that are bent and formed on the lower outside are provided in the reference numerals 1 and 201, and arc-shaped guide holes 201b and 201b are formed.

A pair of light amount correction plates 2 constructed in this way
Reference numerals 01 and 201 respectively denote central portions of the mounting flange portion 94b of the lens center adjustment base 94, which are inserted into shaft holes (not shown) provided at the radial center positions of the arc-shaped guide holes 201b and 201b in the inner lower portions. Each of them is swingably supported by support shafts 202, 202 mounted in the optical axis direction. The swing of the pair of light amount correction plates 201, 201 is guided by the guide pins 203, 203 attached to the mounting flange portion 94b through the arc-shaped guide holes 201b, 201b. The support shafts 202, 202 and the guide pins 203, 203 are fitted between the pair of light amount correction plates 201, 201 and the heads of the support shafts 202, 202 and the guide pins 203, 203, respectively. Correction plate holding members 204, 204 and 20
5, 205 are provided respectively. In this way, the pair of light amount correction plates 201, 201 that are swingably supported about the support shafts 202, 202 have the mounting portions 201a, 201a formed by bending the outer lower part thereof and the pair of tilt guide members. Inclined surfaces 105a and 105 of 105 and 105
It is placed on 05a.

The exposure apparatus shown in FIGS. 7 and 8 is configured as described above, and the operation when the lens 96 is moved in the optical axis direction based on the setting information of the magnification change will be described below. When the lens receiving base 91 is moved in the direction of reducing the projection magnification (rightward in FIG. 8), the pair of light amount correction plates 201, 201 mounted on the center adjustment base 94 mounted on the lens receiving base 91, A pair of tilt guide members 105
While sliding on the inclined surfaces 105a and 105a of the support shaft 2
The lenses are swung about 02 and 202 so as to approach each other toward the lens center. Therefore, the pair of light amount correction plates 20
A part of the projection light projected toward the lens 96 is blocked by the Nos. 1 and 201, and the projection light amount in the longitudinal direction of the slit exposure area is regulated.

On the other hand, when the lens pedestal 91 is moved in the direction in which the projection magnification is enlarged (to the left in FIG. 8), the pair of light quantity correction plates 201, 201 move to the pair of tilt guide members 10.
While sliding on the inclined surfaces 105a and 105a of No. 5, the support shafts 202, 202 are swung so as to move away from the lens center. Therefore, the amount of blocking the projection light projected toward the lens 96 by the pair of light amount correction plates 201, 201 decreases, and the regulation amount of the projection light amount in the longitudinal direction of the slit exposure region decreases.

As described above, in the present embodiment, the pair of light amount correction plates 201, 201 are configured to be swingable around the support shafts 202, 202, and therefore, compared with the light amount correction plate 101 of the above embodiment. And its operation becomes smooth,
Therefore, the driving load for moving the optical lens unit 9 in the optical axis direction can be reduced. Further, in the present embodiment, since the pair of light amount correction plates 201, 201 are configured to be swingable around the support shafts 202, 202, the light amount correction plates may tilt even if the operation amount increases. Instead, swinging around the support shafts 202, 202 is always performed smoothly. As described above, in the present embodiment, since the operation amount of the pair of light amount correction plates 201, 201 can be made large, sufficient light amount correction can be achieved.

In the exposure apparatus shown in FIGS. 7 and 8, the pair of light amount correction plates 201, 201 is a mounting flange portion 9 of a lens center adjustment base 94 on which a lens is mounted.
4b, the lens center adjustment base 94 is positioned on the vertical axis 911 for positioning in order to adjust the lens mounting angle.
Even if it is rotated around the
The relative positional relationship between 1 and the lens does not change, and the pair of light amount correction plates 201, 201 and the lens can always be maintained in the predetermined relative positional relationship.

[0039]

Since the exposure device of the image forming machine according to the present invention is constructed as described above, the following operational effects can be obtained.

That is, in the exposure apparatus of the image forming machine according to the present invention, the optical lens unit includes a lens pedestal configured to be reciprocally movable along the guide rail in the optical axis direction, and the lens pedestal. A lens center adjustment base disposed so as to be rotatable and fixed around a vertical axis for positioning, a lens mounted on the lens center adjustment base, and a radial direction with respect to the lens center mounted on the lens center adjustment base. And a pair of tilt guide members, each of which is provided in parallel with the guide rail and has a tilt surface. The light amount correction plate is placed, and the light amount correction plate moves along the inclined surfaces of the pair of inclined guide members in accordance with the reciprocating movement of the lens cradle along the guide rails. Radial direction Since it is configured so that it can be moved, when the lens center adjustment base is rotated around the positioning vertical axis when adjusting the lens mounting angle, the light amount correction plate also rotates together with the lens center adjustment base, so the light amount correction plate The relative positional relationship between the lens and the lens does not change. Therefore, the light amount correction plate and the lens can always be maintained in a predetermined relative positional relationship.

Further, in the exposure apparatus of the image forming machine according to the present invention, the optical lens unit has a lens pedestal configured to be reciprocally movable along the guide rail in the optical axis direction, and the lens pedestal. It is equipped with a lens provided and a pair of light amount correction plates that are swingably supported by a pair of support shafts mounted on the lens pedestal in the optical axis direction, and are arranged parallel to the guide rails. A pair of inclined guide members each provided with an inclined surface, and a pair of light amount correction plates are respectively mounted on the inclined surfaces of the pair of inclined guide members for reciprocal movement along the guide rails of the lens cradle. Accordingly, the pair of light amount correction plates move along the inclined surfaces of the pair of tilt guide members so that the pair of light amount correction plates can be swung around the pair of support shafts. Of the light intensity correction plate Becomes smoother, thus, it is possible to reduce the drive load for moving the optical lens unit in the optical axis direction. Further, since the pair of light amount correction plates are configured to be swingable about the support shaft as described above, the light amount correction plates do not tilt even if the operation amount increases, and the light amount correction plates are centered on the support shaft. The rocking is always smooth. Further, since it is possible to increase the operation amount of the pair of light amount correction plates, it is possible to achieve sufficient light amount correction.

[Brief description of drawings]

FIG. 1 is a schematic sectional view showing an electrostatic copying machine as an image forming machine equipped with an exposure device constructed according to the present invention.

FIG. 2 is a plan view of a main part showing an embodiment of an exposure apparatus configured according to the present invention.

3 is a side view of a main part of the exposure apparatus shown in FIG.

4 is a front view of a main part of the exposure apparatus shown in FIG.

5 is an exploded side view of an optical lens unit that constitutes the exposure apparatus shown in FIG.

6 is an explanatory view showing a state in which a lens mounting angle of an optical lens unit which constitutes the exposure apparatus shown in FIG. 2 is adjusted.

FIG. 7 is a main part front view showing another embodiment of the exposure apparatus configured according to the present invention.

8 is an exploded side view of an optical lens unit that constitutes the exposure apparatus shown in FIG.

[Explanation of symbols]

2: Airframe housing 3: Contact glass 4: Original pressing plate 6: First moving body 7: Second moving body 8: Stationary mirror group 9: Optical lens unit 10: Photosensitive drum 11: Corona discharger for charging 12: Developing device 13: Transfer corona discharger 14: Corona discharger for peeling 15: Cleaning unit 16: Static elimination lamp 20: Transfer paper supply device 22: Transfer paper transport belt mechanism 61: Irradiation lamp 62: Reflector 63: Slit for exposure 64: first mirror 71: Second mirror 72: Third mirror 81: Fourth mirror 82: Fifth mirror 83: Sixth mirror 91: Lens cradle 911: Vertical axis for positioning 92: Guide rail 93: Lens moving means 931: Stepping motor 931 932: reducer 933: Drive pulley 934: pulley 935: pulley 936: Endless wire 94: Lens center adjustment stand 96: Lens 97: Lens frame 100: Light amount correction means 101: Light amount correction plate 102: Guide pin 103: Correction plate sandwiching member 105: Inclined guide member 200: Light intensity correction means 201: Light amount correction plate 202: spindle 203: Guide pin 204: Correction plate sandwiching member 205: Correction plate sandwiching member

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) G03B 27/00-27/80 G03G 15/04 G03G 15/043

Claims (5)

(57) [Claims] 1. An optical lens unit is guided in an optical axis direction.
In an exposure device of an image forming machine configured to be reciprocally movable along a rail and exposing a document image on a photosensitive surface of a photoconductor through the optical lens unit, the optical lens unit is reciprocally movable along the guide rail. A lens pedestal configured as described above, a lens center adjustment base disposed on the lens pedestal so as to be rotatable and fixed about a positioning vertical axis, a lens mounted on the lens center adjustment base, and the lens center is attached to the adjustment table is provided with a light amount correcting plate which is movable in the radial direction with respect to the lens center, one having a respective inclined surfaces arranged parallel to the said guide rail
A pair of tilt guide members, the pair of tilt guide members
The light amount correction plate is placed on the inclined surface of the
The light amount correction plate along with the reciprocating movement along the guide rail
Can move along the inclined surfaces of the pair of inclined guide members.
And the light quantity correction plate is moved radially with respect to the center of the lens.
An exposure device for an image forming machine , which can be moved . 2. The optical lens unit in the optical axis directionguide
Along the railThe optical lens is configured to be reciprocally movable.
Expose the original image on the photosensitive surface of the photoconductor through the unit.
In the exposure device of the image forming machine, The optical lens unit isAlong the guide railround trip
A lens pedestal configured to be movable, and the lens pedestal
And the lens mounted on the lens mount in the optical axis direction.
It was supported swingably by a pair of attached shafts.
It is equipped with a pair of light quantity correction plates,One that is arranged in parallel with the guide rail and that has an inclined surface.
A pair of tilt guide members, the pair of tilt guide members
The pair of light amount correction plates are respectively mounted on the inclined surfaces of the
When the pedestal is moved back and forth along the guide rail,
A pair of light amount correction plates are provided on the inclined surfaces of the pair of inclined guide members.
By moving along, the pair of light amount correction plates
Can be swung around the spindle of An exposure apparatus for an image forming machine, which is characterized in that 3. An arcuate guide hole centering on the pair of support shafts is provided in each of the pair of light amount correction plates,
The exposure apparatus for an image forming machine according to claim 2, wherein a guide pin that is inserted through the arc-shaped guide hole is mounted on the lens center adjustment base. 4. The optical lens unit in the optical axis directionguide
Along the railThe optical lens is configured to be reciprocally movable.
Expose the original image on the photosensitive surface of the photoconductor through the unit.
In the exposure device of the image forming machine, The optical lens unit isAlong the guide railround trip
A lens pedestal configured to be movable, and the lens pedestal
Is arranged so that it can be rotated and fixed about the vertical axis for positioning.
Mounted on the lens center adjustment table and the lens center adjustment table
Mounted on the lens center adjustment stand along the optical axis
And a pair of support shafts, each of which is swingably supported.
It is equipped with a light quantity correction plate,One that is arranged in parallel with the guide rail and that has an inclined surface.
A pair of tilt guide members, the pair of tilt guide members
The pair of light amount correction plates are respectively mounted on the inclined surfaces of the
When the pedestal is moved back and forth along the guide rail,
A pair of light amount correction plates are provided on the inclined surfaces of the pair of inclined guide members.
By moving along, the pair of light amount correction plates
Can be swung around the spindle of An exposure apparatus for an image forming machine, which is characterized in that 5. An arc-shaped guide hole centering on the pair of support shafts is provided in each of the pair of light amount correction plates,
The exposure device of an image forming machine according to claim 4, wherein a guide pin that is inserted through the arc-shaped guide hole is mounted on the lens center adjustment base.