JPH04166824A - Optical writing device - Google Patents

Abstract

PURPOSE:To obtain a device having stable high resolving power by fine adjusting a relative position between a holding member and a sensitized unit relating to each direction so as to high accurately perform positioning. CONSTITUTION:A tilt gamma and a Y directional position of a write unit are fine adjusted by turning right/left cylindrical cams 87, 92, a tilt beta of the write unit is fine adjusted by turning right/left cylindrical cams 117, 134, a tilt alpha or a Z directional position of the write unit is moved fine adjusted by turning eccentric round shafts 80, 83, and an X directional position of the write unit is moved fine adjusted by turning an adjusting screw 72. Thus by high accurately position adjusting a light emitting element array holding member, integrally formed with the write unit, in a main scanning direction and a subscanning direction, positioning in an optical axis direction of a focusing light transmitter can be performed so as to perform imaging in high resolution.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an optical writing device used in an electrostatic recording device, etc., and more specifically, the present invention relates to an optical writing device used in an electrostatic recording device or the like. The present invention relates to an optical writing device that forms a light image of a light emitting element array onto a photoreceptor using a convergent light transmitting body array.

[Conventional technology]

Conventionally, in an electrostatic recording device using an optical writing device, a laser beam is deflected by a rotating polygon mirror, and an extremely small beam spot is focused on the photoreceptor surface by an fθ lens, thereby creating an electrostatic latent image according to an image signal. However, the optical path length from the light emitting source to the photoreceptor was several hundred meters.
m, and because it uses a high-speed rotating body,
The equipment was large and costly. Therefore, recently, in place of lasers, light emitting diode arrays that are arranged in series in the main scanning direction and whose blinking is controlled by image signals are being used.
(LED array) or a liquid crystal shutter array has been developed that uses a liquid crystal shutter array as a writing light source, and the length in the main scanning direction is also 1.
000 mm are commercially available, and are also used as wide-width optical writing devices for print output in CAD (computer-aided design).

Conventional optical writing devices of this type are configured to form a dot-shaped optical image on a photoconductor using a convergent light transmitting array (Selfox Lens Array 2, also referred to as SLA). , the distance (TC) from the light source to the photoreceptor is as short as 15 mm to 60 n+m. Therefore, the space occupied by the writing device is small, making it possible to downsize the electrostatic recording device.

[Problem to be solved by the invention]

However, in such conventional optical writing devices, the output of a writing light source such as an LED array or a liquid crystal shutter was extremely small compared to the output of a laser light source, so SLA, which forms an image of this output on a photoreceptor, is , it had to have a small F value and sufficiently bright imaging characteristics.

However, SLA has the characteristic that when its brightness is high, the imaging focal depth becomes small.
The LA-9TC48 has an F value of 2.72 and a depth of focus of ±0.
6 n+n+, whereas 5LA-20TC18
mm, the F value is 0.96, which is bright, but the depth of focus is small, ±0.3 mm. Therefore, the relative position between the light emitting surface of the LED array or the like and the SLA, and the relative position between the SLA and the photoreceptor surface require highly accurate positioning over the entire main scanning direction. Moreover, SL
The position of the light emitting surface and photoreceptor surface relative to A is in the (+) direction or (
If they are shifted in the same direction (-) direction, the resolution (MTF) will decrease little, but if they are shifted in opposite directions (+) and (-), the MTF will be extremely reduced. As a result, even though the LED array and SLA are held in a given relative position,
It is extremely difficult to position and hold the LED array and SLA in a predetermined position with high precision over the entire main scanning direction, especially in the case of A zero size width or 36# width, the member that positions and holds the LED array and SLA in a predetermined position is 1000 mm or more. Therefore, it is extremely difficult to accurately position the holding member over the entire main scanning direction.

Further, the holding member is not limited to the optical axis direction of the SLA, but also to the position of the photoreceptor in the main scanning direction and sub-scanning direction.
High-precision positioning is also required for the inclination around the optical axis of the LA and the inclination of the optical axis. JP-A-502806 merely discloses a position adjustment technique in the optical axis direction.

Furthermore, in the optical writing device used for writing with A zero width or 36" width as described above, the power required per one dot of the LED array etc. is about 15 milliwatts, but the total number of dots can reach about 14,000 dots. When all the dots are lit at the same time, the power reaches 210,000 milliwatts (210 watts), and the heat generation inevitably causes thermal deformation of the holding member. In particular, the thermal expansion of the holding member in the main scanning direction causes light There was a problem that the MTF decreased due to curvature in the axial direction.On the other hand, the SLA held by the holding member was bent due to heating (
Japanese Patent Laid-Open No. 1-278376 discloses a device in which the holding member is bent in advance in the same direction to compensate for the deformation (deformation), but no means for preventing thermal deformation of the holding member itself is disclosed. Further, as mentioned above, the length of the holding member in the main scanning direction is 1
000 mm, the thermal expansion in the main scanning direction due to the heat generated by the light emitting light source is large, so effective heat dissipation cooling is required to prevent the holding member from being distorted in the optical axis direction of the convergent light transmitter array. However, there is no disclosure of any means for minimizing thermal deformation of the holding member by actively dissipating and cooling the heat generated by the light emitting light source such as the LED array.

That is, in a conventional optical writing device, a photoreceptor,
There has been a problem in that relative positioning of the light emitting element array and the convergent light transmitting body array with a holding member that holds the light emitting element array and the convergent light transmitting body array at predetermined relative positions cannot be performed sufficiently.

[Purpose of the invention]

Therefore, an object of the invention as set forth in claim 1 is to provide an optical writing device that finely adjusts the relative position between the holding member and the photoreceptor in each direction, performs positioning with high precision, and has stable and high resolution. The invention as set forth in claim 2 further aims to prevent occurrence of distortion due to thermal deformation of the positioned holding member and deformation of the holding member due to fastening force.

[Means to solve the problem]

To achieve the above object, the invention according to claim 1 provides a light emitting element array arranged in series in the main scanning direction and blinking controlled by an image signal, and a photoreceptor that moves in the sub scanning direction with respect to the light emitting element array. and a convergent light transmitter array for forming a light image of the light emitting element array on a photoreceptor, the light emitting element array and the convergent light transmitter array being integrated at a predetermined relative position. a holding member for positioning and holding the convergent light transmitting body array; X-direction movement fine adjustment means for finely adjusting the amount of movement of the holding member relative to the photoconductor in the orthogonal main scanning direction; Y-direction movement fine adjustment means for finely adjusting the amount of movement of the member; α inclination fine adjustment means for finely adjusting the amount of inclination of the optical axis of the convergent light transmitting body array in the main scanning direction;
β-tilt fine adjustment means for finely adjusting the amount of inclination of the optical axis of the convergent light transmitter array in the sub-scanning direction; γ-inclination fine adjustment means for adjusting. , α inclination fine adjustment means, β inclination fine adjustment means, and γ inclination fine adjustment means, at least one of which includes urging means for urging the holding member in a predetermined direction and a blocking member capable of blocking the holding member. It is characterized by having the following.

Hereinafter, the present invention will be explained based on examples.

1 to 8 are diagrams showing an embodiment of an optical writing device according to the invention set forth in claim 1.2, and show an example in which the invention is applied to a dry electrophotographic electrostatic recording device.

First, the configuration will be explained.

In FIG. 1, 10 is an electrostatic recording device, 11 is a lower housing of the electrostatic recording device 10, and 12 is a support shaft 13 on the lower housing 11.
14 is an operation panel provided at the front end of the upper housing 12. In this electrostatic recording device 10, left and right side plates 15L and 15R are provided at a predetermined interval in a lower casing 11, and a photosensitive drum 31 is rotatably supported on the left and right side plates 15L and 15R. . The photoreceptor drum 31 is rotated in the direction of the arrow in the figure, its surface is uniformly charged by a charging charger 32, and exposed according to an input image signal by an optical writing device 50 located directly above the photoreceptor drum 31. be done. Due to this exposure, an electrostatic latent image is formed on the photoreceptor drum 31, and this is visualized by the developing device 33 to become a toner image. On the other hand, the transfer paper 34 conveyed to the registration roller 36 by the feeding roller 35 is fed between the photosensitive drum 31 and the transfer charger 37 at a predetermined timing by the registration roller 36, and the transfer paper 34 is conveyed to the registration roller 36 by the registration roller 36.
7 on the photoreceptor drum 31! ~Luna- is transfer paper 3
Transferred to 4. This transfer paper 34 is transferred to a separate charger 38
is separated from the photoreceptor drum 31 by the conveyor belt 3
9 to a fixing device 40 where the toner image is heated and fixed, and then discharged to a discharge tray 42 by a discharge roller 41. After the toner image has been transferred, the photosensitive drum 31 is cleaned of residual toner by a cleaning device 43, and then
The charged area is reached again and the image forming process is repeated again. The image forming process described above is similar to that of a known electrophotographic apparatus, and a detailed explanation of the configuration will be omitted. Note that 20 is an air blower provided in the upper housing 12 so as to face the optical writing device 50, and the air blower 20 cools the optical writing device 50 by blowing air.

The optical writing device 50 has support shafts 16L and 16R on its rear side.
The left and right locking arms 64L, 64 on the front side of the optical writing device 50 are locked to the left and right side plates 15L, 15R via
R is locked to locking bases 17L, 17R formed on the upper parts of the left and right side plates 15L, 15R by screws 18L, 18R.

In FIG. 2.7, the blower device 20 has a blower 21 and a filter 22, and the clean air filtered by the filter 22 is forcibly sent downward toward the optical writing device 50 by the blower 21. The air flows through the air guide path 23.24 while removing heat from the heat dissipation fins 102 of the LED array holding member 101, and from the nozzle 25.26 to S L
The light is strongly ejected onto the light exit surface 111a of A11l.

Note that the distance between the light exit surface 111a of the 5LAIII and the surface of the photoreceptor drum 31 is extremely close, for example, 4.8 mm, and as the photoreceptor drum 31 moves in the sub-scanning direction (Y direction), the toner powder is removed. If dust such as paper dust or the like passes through the gap, it tends to adhere to the light exit surface 111a and cause the written image to be missing or deteriorate. Face 11
It is prevented from adhering to 1a.

The optical writing device 50 has a length of, for example, 1000 as shown in FIG.
It has a writing unit 100 of about mm and a holding frame 60 (locking frame) that holds it, and the writing unit 10
0 includes an LED array 104 (light emitting element array) which is arranged in series in the main scanning direction (X direction) and whose blinking is controlled by an image signal, and a light image of the LED array 104 is formed on the photoreceptor drum 31. Selfox lens array 1
11 (hereinafter referred to as convergent light transmitter array 2, 5LAIII) is provided. In this case, write unit 1
00, the writing width in the main scanning direction on the photosensitive drum 31 is 36'' (914 mm).

The holding frame 60 is positioned at predetermined positions on the left and right side plates 15L, 15R by the support shafts 16L, 16R and the locking stands 17L, 17R, and the installation position and orientation of the unit 100 can be adjusted by a holding mechanism 55, which will be described later. I'm holding onto it as much as I can. Furthermore, a convex portion 61a on the front wall 61 and a convex portion 66a on the rear wall 66 are provided at the central portion in the longitudinal direction of the holding frame 60, and both convex portions 61a and 66a extend orthogonally to the longitudinal direction. A finger member 74 is attached.

In addition, in the writing unit l-100, the LED array holding member 101 that holds the LED array 104 and the 5L
The SLA holding member 110 that holds AIII and the screw 11
2, and these holding members 10
1 and 110 integrally position and hold the LED array 104 and 5LA 111 at predetermined relative positions. Also,
A radiation fin 102 and a center beam 103 extending in the main scanning direction are formed on the LED array holding member 101, and a control board 105 is attached thereto. Both holding members 101 and 110 are supported by the finger members 74 of the holding frame 60 by angles 106 and adjustment screws 75, so that the writing unit 100 can swing in any direction relative to the holding frame 60. At the same time, the writing unit 100 can be moved in the optical axis direction (X direction) of the 5LA 111 by adjusting the adjustment screw 75.

Further, the holding frame 60 houses a holding mechanism 55 that finely adjusts the position and installation posture of the writing unit 100.
This holding mechanism 55 is constructed as shown in FIG. 3.5 at the right end of the writing unit 100 in the main scanning direction. First, the right support block 11 is attached to the holding members 101 and 110.
3 is screwed onto the right support block 113, and a concentric round shaft 116 and a concentric round shaft 114 extending in the main scanning direction are attached to the right support block 113.
are screwed together with a certain height difference. Concentric round shaft 1
14, an eccentric right cylindrical cam 117 is attached to the set screw 118 and a brake (not shown) so that the rotation can be adjusted by a predetermined amount of eccentricity. The concentric round shaft 116 directly abuts the eccentric round shaft 80 to support the positioning of 5LAIII in the optical axis direction on the right end side of the writing unit 100. Also, these axis 1
The small diameter portions 114a and 116a at the other end of 14.116 are urged toward the bottom wall 70 side of the holding frame 60 by a tension spring 119.121 stretched between the fixing pins 122 and 123 on the holding frame 60 side. , the right cylindrical cam 117 is a concentric round shaft 114
When the writing unit 100 is rotated relative to the front side, the writing unit 100 moves slightly up and down on the front side, and the inclination β of the LED array 104 in the sub-scanning direction is finely adjusted. The eccentric round shaft 80 consists of concentric large diameter shaft parts 80a, 80d, groove parts 80b, 80e, and eccentric small diameter shaft part 80C;
80d are fitting holes 62A and 62B formed in the holding frame 60.
It is rotatably inserted into the This concentric large diameter shaft portion 80a
, 80d are formed in grooves 80b and 80d, and a brake member 81 made of hard synthetic resin is pressed by a set screw 82, and the eccentric round shaft 80 is prevented from being pulled out by both splitters 81. It can be rotated by adjusting the set screw 82. That is, the eccentric round shaft 80 is rotatably supported by the holding frame 60 on the right end side in the main scanning direction of the holding members 101 and 110 so as to extend in the sub-scanning direction. This eccentric round shaft 8
The eccentric small diameter shaft 80C of 0 is formed to be eccentric by a predetermined amount with respect to the concentric large diameter shafts 80a and 80d.
Due to the rotation, the right end of the writing unit 100 supported by the eccentric small diameter shaft 80C moves up and down, and the LED array 1
The inclination α of the optical axis 04 in the main scanning direction is finely adjusted. Furthermore, the right support block 113 is biased toward the rear wall 66 of the holding frame 60 by a tension spring 142 via pins 141 and 143, so that the concentric round shaft 116 is pushed against the right bottom wall 70a of the holding frame 60. It abuts through an attached upright round shaft 86 and a right cylindrical cam 87. This right cylindrical cam 87 is rotatably fixed to the upright round shaft 86 by a set screw 88, and when the right cylindrical cam 87 is rotatably adjusted, the direction of horizontal rotation of the writing unit 100, that is, the LED
The inclination (γ) of the holding members 101 and 110 with respect to the photosensitive drum 31 around the optical axis of the array 104 is slightly 1! It will be arranged. Further, a protrusion 71 protruding from the right bottom wall 70a of the holding frame 60 is provided adjacent to the right support block 113, and the protrusion 71 includes an adjustment screw 72 extending in the main scanning direction and a brake (not shown). A set screw 73 that prevents rotation is screwed together through the screw.

This adjustment screw 72 abuts against the right support block 113 from one side in the main scanning direction, and is connected to the right support block 113 via pins 124 and 128.
ζ Tension spring 129 holds right support block 113 against frame 60
The writing unit 00 is positioned in the main scanning direction by biasing it toward the right side wall 68.

On the other hand, as shown in FIG.
A left support block 131 is screwed onto the left support block 131, and a concentric round shaft 12 extending in the main scanning direction is attached to the left support block 131.
6 and a concentric round shaft 115 are screwed together with a certain height difference. In addition, a left cylindrical cam 134 is attached to the concentric round shaft 115.
is mounted so as to be rotatably adjustable with a predetermined eccentricity using a set screw 135 and a brake (not shown), and this left cylindrical cam 134 abuts on an eccentric round shaft 83 extending in the sub-scanning direction. 126 directly abuts on the eccentric round shaft 80, and the writing unit 100 is positioned and supported in the optical axis direction of the SLA 11l. Moreover, these axes 114.
The other end small diameter portions 114a and 116a of the tension spring 13 are tensioned between the pins 138 and 139 on the holding frame 60 side.
6.137 toward the bottom wall 70 of the holding frame 60, and when the left cylindrical cam 134 is rotated about the concentric round shaft 115, the writing unit 100 moves slightly up and down on the front side. Then, the amount of inclination (β) of the LED array 104 in the sub-scanning direction is finely adjusted. The eccentric round shaft 83 consists of concentric large-diameter shafts 33a, 83d, grooves 83b, 83e, and eccentric small-diameter shaft 83c. It is movably inserted. In addition, the concentric large diameter shafts 33a, 83d
A brake member 84 made of hard synthetic resin is pressed against grooves 83b and 83e formed in the grooves 83b and 83e by a stopper or screw 85.
The eccentric round shaft 83 is prevented from being pulled out by both splitters 84, and can be rotated by adjusting a set screw 85. That is, the eccentric round shaft 83 is rotatably supported by the holding frame 60 at the left end side of the holding member 101, 110 in the main scanning direction so as to extend in the sub-scanning direction. Furthermore, the eccentric small diameter shaft 83C of the eccentric round shaft 83 is formed to be eccentric by a predetermined amount with respect to the concentric large diameter shafts 83a and 83d, and the rotation of the eccentric round shaft 83 causes the eccentric small diameter shaft 83C to be supported by the eccentric small diameter shaft 83c. Uniso 110
0 moves up and down, and the amount of inclination (α) of the optical axis of the LED array 104 in the main scanning direction is finely adjusted. Furthermore, the left support block 131 is biased toward the rear wall 66 of the holding frame 60 by a tension spring 145 via pins 144 and 146, so that the concentric round shaft 126 is
It abuts against an upright round shaft 91 attached to the left bottom wall 70b of 0 through a left cylindrical cam 92. This left cylindrical cam 92 is rotatably fixed to the upright round shaft 91 by a set screw 93, and when the left cylindrical cam 92 is rotatably adjusted, the LE
The amount of inclination (γ) of the holding members 101 and 110 relative to the photoreceptor drum 31 is finely adjusted around the optical axis of the D array 104.

That is, the holding mechanism 55 holds the photosensitive drum 31 in the optical axis direction (X direction) of 5LAIII by the in-phase rotation of the eccentric round shaft 80.83 and the urging force of the tension springs 119, 121, 136, 137. Part 101.11
It is an X direction movement fine adjustment means for finely adjusting the movement amount of 0,
It is an X-direction movement fine adjustment means that finely adjusts the movement amount of the holding member 101, 110 in the main scanning direction (X direction) perpendicular to the X direction by the biasing force of the tension spring 129 and the rotational position of the adjustment screw 72, Right cylindrical cam 87 and left cylindrical cam 92
Y-direction movement fine adjustment means for finely adjusting the amount of movement of the holding member 101, 110 in the sub-scanning direction (Y direction) perpendicular to the be. In addition, the holding mechanism 55 tilts the optical axis of the SLA 111 in the main scanning direction (α
) is an α inclination fine adjustment means that finely adjusts the amount of inclination (β
) is a β slope fine adjustment means for finely adjusting the amount, and 5LAII
Holding member 1 relative to photoreceptor drum 31 around the optical axis of I
This is a γ slope fine adjustment means for finely adjusting the slope (γ) amount of 01.110. Also, an adjustment screw 75 and a tension spring 77.7
8 is a means for positioning the center portion of the -1 writing unit l-100 in the X direction.

An eccentric round shaft 80.83 extending in the Y direction, a concentric round shaft 116.126 and left and right cylindrical cams 117.134 extending in the X direction, and a left and right cylindrical cam 87 standing upright in the X direction.
．． 92 and the adjustment screw 7 that abuts against the right support block 113
2 are the LED play holding member 101 and SL, respectively.
It is a blocking member that blocks the holding member 110 in a predetermined direction, and the tension spring 77.78.119.121.136.1
37, 142, 145 and 129 cooperate with these blocking members to hold the LED array holding member 101 and SLA
This is a biasing means for positioning the holding member 110 at a predetermined position.

Next, the effect will be explained.

First, the holding frame 60 is fitted with support shafts 1.6L and 16R in the conical holes 68a and 69a on one side (rear side) in the sub-scanning direction.
The left and right locking arms 64L and 64R are inserted and locked.
are screwed to the locking bases 17L and 17R of the left and right side plates 15L and 15R, and are positioned in the optical axis direction (X direction) of 5LAIII.

Next, the holding mechanism 55 finely adjusts the installation position and installation attitude of the writing Unisol l-100 held by the holding frame 60, that is, the imaging position of the LED array 104 on the photoreceptor drum 31 by 5LAIII. be done.

First, for example, when the right cylindrical cam 87 and the left cylindrical cam 92 are rotated so that their rotational positions are relatively different, the right end or left end of the writing unit l-100 moves in the Y direction,
Around the optical axis of LAIII, the inclination Wk Cr> of the writing uni-segment 00 with respect to the photosensitive drums 3 and 1 is finely adjusted, and S
Axis center (or generatrix) of L A11l and photoreceptor drum 31
Highly accurate parallelism is ensured.

In addition, when the right cylindrical cam 87 and the left cylindrical cam 92 are rotated in the same phase from the predetermined position where the writing unizo OO is positioned in the Y direction, the movement is finely adjusted so that the writing unizo 00 moves in parallel in the sub-scanning direction. be done.

Note that at this time, the writing unit 100 only horizontally pivots while being supported by the eccentric round shafts 80, 83 extending in the Y direction, and changes in the amount of inclination (α or β) in other directions are prevented.

Next, the right cylindrical cam 117 or the left cylindrical cam 134,
By rotating the force or number, the writing uniso 1400 is slightly rotated around the concentric round shaft 116, 126, and the 5LAI
The amount of inclination (β) of the optical axis of II in the sub-scanning direction is finely adjusted. Also during this β inclination adjustment, the concentric round shafts 116, 126 at both ends of the writing uniisos 1 to 100 are connected to the left and right cylindrical cams 87.
92 serves as a rotational fulcrum in a state where it is positioned in the Y direction, and unnecessary displacement can be avoided.

Next, when the eccentric round shaft 80 and the eccentric round shaft 83 rotate relative to each other, the writing Unisol l-100 becomes the eccentric small diameter shaft 80C18.
3C nods by relative up and down movement. Therefore, 5
The amount of inclination (α) of the optical axis of LAIII in the X direction is finely adjusted. On the other hand, when the eccentric round shafts 80 and 83 rotate in the same phase, the writing unit 100 moves up and down minute by minute while maintaining the same installation posture, and the direction of the optical axis (X
You can make fine adjustments to the position (direction). In both cases, the writing unit 100 is equipped with the adjusting screw 72 and the tension spring 1.
Since it remains positioned in the X direction by 29, unnecessary displacement can be prevented.

In this state, by rotating the adjustment screw 72 to finely adjust the writing uniiso l-100 in the main scanning direction (X direction), the writing uniiso l-100 is positioned in the Y and X directions. A slight movement in the X direction completes a series of fine adjustments in position and orientation.

In this way, in this embodiment, the left and right cylindrical cams 87.
92, the amount of inclination T or amount of movement in the Y direction of the writing unit 100 is finely adjusted, and the left and right cylindrical cams 117.13
4, the inclination amount β of the writing Unisol I-100 is finely adjusted, and the rotation of the eccentric round shaft 80.83 finely adjusts the inclination amount α or the X-direction movement amount of the Writing Unisol I-100. X of the writing unit 100 by the rotation of 72
The amount of directional movement is finely adjusted.

That is, the optical writing of the writing unit 100 onto the photoreceptor drum 31 is performed with high accuracy positional adjustment in the main scanning direction and the sub-scanning direction.
11 in the optical axis direction.

Therefore, the holding mechanism 55 makes it possible to adjust the image formation position of S L A 11l on the photoreceptor drum 31 with high precision and easily, so that the optical image of 5LAIII formed on the photoreceptor drum 31 can be adjusted easily. Images are formed with high resolution over the entire main scanning direction, and the surface angle (rusk perpendicularity) of the image line in the sub-scanning direction and the image line in the main scanning direction is formed with high precision, eliminating unnecessary light. An optical marking device 50 is provided that has no blur or ghost due to reflection, has high resolution, has high positional accuracy of an optically written image, and reliably prevents distortion of the written image.

When the length of the writing Unison OO reaches approximately 101000+ as in this embodiment, the writing Unison 1-
If only both ends of the writing unit 100 are held, a bending moment due to its own weight will act on the writing unit 100 and bending will occur, and the amount of curvature of the writing unit 100 will be, for example, at most 0.
3n++i, resulting in a decrease in resolution. In contrast, in this embodiment, the LED array holding member 10
A center beam 103 that also serves as a radiation fin extending in the longitudinal direction is provided on the upper part of the frame 103 to improve bending rigidity, and a front wall 6 of the holding frame 60 is provided above the central part in the longitudinal direction.
1 and a finger member 74 spanning the rear side wall 66, the angle 1
The tension spring 7 is moved back and forth by the adjustment screw 75 attached to the
7.78, the vertical position of the writing unit 100 urged onto the finger member 74 is finely adjusted. Therefore, the amount of movement in the X direction can be positioned with high precision even at the center of the tl' writing unit 100, and vibrations at the center of the writing unit 100 can be suppressed. Furthermore, tension springs 119.121.136.137
The biasing position allows the bending moment applied to the writing unit 100 due to its own weight to be alleviated.

On the other hand, in this embodiment, during the above-mentioned positioning and fine adjustment of the posture, the mouth-fitting unit 100 is attached to the tension springs 119, 121, 136, 1 on the left and right eccentric round shafts 80.83.
37 toward the bottom wall 70 of the holding frame 60, and is positioned in the X direction at both left and right ends.

Therefore, even if thermal expansion occurs in the main scanning direction or sub-scanning direction of the writing UNISO l-100 due to the heat generated by driving the LED array 104, the optical axis of the 5LA 111 is
(direction) and changes in the amount of α inclination or β inclination are prevented, and the resolution of the spoken image does not deteriorate.

In addition, the insertion unit 100 can slide in the X and X directions on the left and right eccentric G round shafts 80.83, and can also move in the X direction without sliding on the cylindrical cam 87.92. The rear wall 66 of the holding frame 60 is biased by tension springs 142 and 145. Therefore, even if the writing unit 71100 thermally expands in the main scanning direction, positional deviation in the sub-scanning direction and change in γ inclination due to this are prevented.

Furthermore, the right side wall 68 of the holding frame 60 is moved by the tension spring 129 so that the right support block 113 abuts against the adjustment screw 72.
, and is positioned in the X direction. Therefore, when the writing unit OO thermally expands in the longitudinal direction, it thermally expands on the left end side with respect to the abutment point of the writing unit 100, and the light By setting the starting position of the insertion in the main scanning direction on the right support block 113 side, the problem that the starting position of the male insertion is shifted can be prevented.

In this way, the male insertion unit 100 is elastically pushed and positioned by the biasing means to the reference position to be compared with the abutting member, and the insertion unit 100 is prevented from thermal expansion by the screw fastening force or the like. Therefore, the writing unit 100 is prevented from being distorted during thermal expansion, and optical writing with high positional accuracy and high resolution is stably performed.

〔effect〕

According to the invention described in claim 1, the light emitting element array and the convergent light transmitting body array are integrally positioned and held at predetermined relative positions by the holding member, and the convergence is adjusted by the X-direction movement fine adjustment means. Adjust the amount of movement in the optical axis direction of the optical transmission body array, and move in the X direction v11. The adjustment means adjusts the amount of movement in the main scanning direction perpendicular to the optical axis direction of the convergent light transmitter array, and the X direction movement fine adjustment means adjusts the amount of movement in the main scanning direction and the sub-scanning direction orthogonal to the optical axis of the convergent light transmitter array. The amount of movement in the direction is adjusted, the amount of inclination of the optical axis of the convergent light transmitter array in the main scanning direction is adjusted by the α-tilt fine adjustment means, and the amount of tilt of the optical axis of the convergent light transmitter array is adjusted by the β-tilt fine-adjuster. The amount of inclination in the sub-scanning direction is finely adjusted, and the amount of inclination of the holding member with respect to the photoreceptor is finely adjusted around the optical axis of the convergent light transmitting body array by the γ inclination fine adjustment means.
The holding member can be positioned with high accuracy in the main scanning direction and the sub-scanning direction, and the convergent light transmitting body array can be positioned in the optical axis direction so as to form an image with high resolution. In addition, the optical image of the convergent light transmitter array formed on the photoconductor is formed with high resolution over the entire main scanning direction, and the image line in the sub-scanning direction and the image line in the main scanning direction are It is possible to provide an optical writing device in which the surface angle of the image is formed with high accuracy, there is no blur or ghost due to unnecessary light reflection, and high resolution is achieved.

According to the invention according to claim 2, at least one of the adjusting means includes urging means for urging the holding member in a predetermined direction;
Since it has a blocking member that can stop the holding member in a predetermined position, it is possible to prevent displacement of the holding member and the optical transmission array due to thermal expansion, and to prevent deformation of the holding member due to regulation of thermal expansion. It is possible to provide an optical writing device with high positional accuracy that can reliably prevent distortion of a written image.

[Brief explanation of the drawing]

1 to 8 are diagrams showing an embodiment of the optical writing device according to the invention set forth in claim 1.2, and FIG. 1 is a schematic configuration diagram of an electrostatic recording device incorporating the optical writing device. , Figure 2 is a plan view of the main parts of the optical writing device, Figure 3 is a perspective view of the vicinity of the right end of the locking frame, Figure 4 is a perspective view of the vicinity of the left end of the locking frame, and Figure 5 is a view of Figure 2. 6 is a sectional view taken along the Vl-Vl arrow in FIG. 2, and FIG.
8 is a cross-sectional view taken along the arrow ■-■ in the figure, and FIG. 8 is a cross-sectional view taken along the arrow ■ in FIG. 10-- Electrostatic recording device, 31...- Photoreceptor drum (photoreceptor), 50...
--- Optical writing device, 55... Holding mechanism (X direction movement fine adjustment means,
direction movement fine adjustment means, X direction movement fine adjustment means, α inclination fine adjustment means, β inclination fine adjustment means, γ inclination fine adjustment means) 72...Adjustment screw (stopping member), 77.78.
119.121.129.136.137.142.1
45...-Tension spring (biasing means), 80.83.
・-・-Eccentric round shaft (stopping portion jjA), 87...--Right cylindrical cam (stopping member), 92...-Left cylindrical force J,
(blocking portion 4A), 100...--writing unit, 101-...-LBD array holding member (holding member),
104...LED array (light emitting element array)
, 110...SLA holding member (holding member), 1
11...Selfox lens array (convergent light transmitter array), 114.115...-Concentric round shaft (stopping member), l
l7--Right cylindrical cam (stopping member), 134--
-・Left cylindrical cam (blocking member).

Claims (2)

[Claims] (1) A light emitting element array arranged in series in the main scanning direction and blinking controlled by an image signal, a photoreceptor moving in the sub scanning direction with respect to the light emitting element array, and a light image of the light emitting element array being transferred to the photoreceptor. a convergent light transmitter array to be imaged on;
An optical writing device comprising: a holding member that integrally positions and holds the light emitting element array and the convergent light transmitter array at predetermined relative positions; and a holding member that holds the convergent light transmitter array relative to the photoreceptor in the optical axis direction. Z-direction movement fine-adjustment means for finely adjusting the movement amount of the member; and X-direction movement fine-adjustment means for fine-tuning the movement amount of the holding member with respect to the photoreceptor in the main scanning direction perpendicular to the optical axis of the convergent light transmitting body array. and Y-direction movement fine adjustment means for finely adjusting the amount of movement of the holding member relative to the photoreceptor in the main scanning direction and the sub-scanning direction perpendicular to the optical axis of the convergent light transmitting body array; α-tilt fine-adjustment means for fine-tuning the amount of inclination of the axis in the main scanning direction; β-tilt fine-adjustment means for fine-tuning the amount of inclination of the optical axis of the convergent light transmitter array in the sub-scanning direction; What is claimed is: 1. An optical writing device comprising: γ-inclination fine adjustment means for finely adjusting the amount of inclination of a holding member with respect to a photoreceptor around an optical axis of an optical transmission body array. (2) At least one of the Z direction movement fine adjustment means, the X direction movement fine adjustment means, the Y direction movement fine adjustment means, the α slope fine adjustment means, the β slope fine adjustment means, and the γ slope fine adjustment means, 2. The optical writing device according to claim 1, further comprising a biasing means for biasing the holding member in a predetermined direction and a blocking member capable of blocking the holding member.