JPH05333448A - Driving device - Google Patents

Abstract

PURPOSE:To obtain a driving device for an optical system that a wire material can be circularly wound along the winding surface of a driving member and stress concentrated on a wire at a contact part with a fixing member can be softened. CONSTITUTION:A pair of optical rails, an illumination unit provided on the optical rail in freely movably and a driving pulley 21 are provided. Then, the wire 18 wound round the pulley 21 is fixed to the illumination unit and one part of the wire 18 is fixed to the pulley 21 by a fixing pawl 54. Besides, a circular-arc surface 55 whose curvature is identical to the outside circumferential surface 51 of the pulley 21 and which is to be the same surface as the surface 51 is provided on the pawl 54.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving device used for moving an optical system in a copying machine, an image reader or the like.

[0002]

2. Description of the Related Art FIG. 57 shows a first conventional drive unit used in an optical system of a conventional copying machine. Inside the outer box 100, a pair of optical rails 101 and 102 as track members are provided in parallel. An illumination unit 103 is provided on the pair of optical rails 101 and 102 as a movable body that can move in parallel in the arrow A direction along the optical rails 101 and 102. The illumination unit 103 includes a light source 104,
A mirror 105, a lens 106, a light receiving element 107, etc. are mounted.

A drive shaft 108 is provided between the optical rails 101 and 102, and is rotatably held by a support arm 109 provided on a wall 112 of the exterior box 100. A drive pulley 11 serving as a drive member is provided at both ends of the support arm 109.
0 and 111 are provided. Deflection pulleys 114, 115 and 116 and a motor 117 are provided near the wall 113 facing the wall 112.

One end of a wire 118 as a wire member is fixed to one end of the lighting unit 103 by a terminal 119. The wire 118 is wound around the drive pulley 110 a plurality of times, and the deflection pulley 115 and the motor 117 are wound.
After being wound on the take-up pulley 120 and the deflection pulley 121, the other end side is connected to the lighting unit 3 via a spring 122.

On the other hand, a wire 123 as a wire is also fixed to the other end of the lighting unit 103 by a terminal 124. The wire 123 is wound around the drive pulley 111 a plurality of times and then connected to the illumination unit 103 by the spring 125 via the deflection pulley 116.

FIG. 58 shows a mechanism for fixing the wire 118 to the drive pulley 110. Drive pulley 111 and wire 1
23 has a similar mechanism. The winding surface of the drive pulley 110, that is, the outer peripheral surface has a circular shape, and the spiral groove 12 is formed therein.
6 is provided.

A flat portion 127 is formed by cutting out the outer peripheral surface in a half-moon shape at a part of the spiral groove 126, and a hemispherical portion 128 is provided at substantially the center of the flat portion 127. On the other hand, wire 1
A ball 129 as a fixing member is fixed to 18 and the ball 129 is immersed in the hemispherical portion 128. The depth of the hemispherical portion 128 is set to a value such that a part of the sphere 129 protrudes outside the spiral groove 126. The reason is that the wire 118 bends extremely at the boundary between the spiral groove 126 and the flat portion 127,
This is to prevent stress from concentrating on the bent portion.

In the above structure, the motor 117 rotates in the forward and reverse directions, and its driving force pulls and drives the wire 118 and is transmitted to the one end side of the lighting unit 103. Also, wire 1
The drive shaft 108 is rotated by pulling 18 and the wire 12
3 is pulled and driven to be transmitted to the other end side of the illumination unit 103.

By the driving force thus transmitted,
The illumination unit 103 reciprocates on the optical rails 101 and 102 in the direction of arrow A to illuminate a document (not shown).

During the above operation, the wires 118 and 123 are attached to the sphere 1.
Since the drive pulleys 110 and 111 are partially fixed by 29, the wires 118 and 123 are
It is reliably positioned in the circumferential direction with respect to 0 and 111.

Therefore, the driving force due to the rotation of the drive pulleys 110 and 111 is surely applied to the wires 118 and 123,
Moreover, it is transmitted evenly, and the movement accuracy of the illumination unit 103 can be maintained.

FIG. 59 shows a second conventional example. 1 in the figure
Reference numeral 30 denotes a photosensitive drum as a photosensitive member that moves, that is, rotates in the direction of arrow A. Above the photosensitive drum 130, a reflection mirror 131 as a first static eliminator that can move substantially horizontally is provided.
Are provided in parallel with the photosensitive drum 130. A holding plate 132 is provided on the side of the reflection mirror 131, and a lamp 133 as a plurality of light sources is provided on the holding plate 132 in parallel with the axis B of the photosensitive drum 130.

On the other hand, above the reflecting mirror 131, at positions corresponding to both ends of the photosensitive drum 130, reflecting mirrors 134 as second charge eliminating means are provided. Further, an arm 143 that rotates about a shaft 135 is provided above the holding plate 132, and the arm 143 has the link 13.
6, 137 are slidably provided in parallel with the axis B, and lamps 138 as light sources are provided at both ends of the links 136, 137. Reference numeral 139 is wiring for the lamp 138.

Above the link 137, there is provided a lever 140 which is horizontally movable in the direction of arrow D. The lever 140 is provided with a guide hole 141.
Pin 142 of link 137 is inserted into 1.

In the above structure, the photosensitive drum 130 rotating in the direction of arrow A is charged by a charger (not shown). Then, an original document (not shown) is illuminated by an exposure unit (not shown), and the image light is scaled.

On the other hand, prior to the exposure, the light flux of the lamp 133 is applied to the upstream side of the image area by the reflection mirror 131 to remove the electric charge. Next, the reflection mirror 131 is retracted to the position indicated by the chain double-dashed line, and the lever 140 operates in response to the zooming operation, so that the links 136 and 137 move horizontally. Then, the light flux of the lamp 138 irradiates both sides of the image area to remove electric charges.

Further, the image light is irradiated onto the photosensitive drum 130 to form an electrostatic latent image. This electrostatic latent image is developed by developing means (not shown), and transferred and fixed onto a transfer sheet (not shown). Also, the downstream side of the image forming area is also neutralized by the light flux of the lamp 133.

By removing the electric charge outside the image area as described above, the transfer material is contaminated due to the adhesion of excess developer,
Prevents scattering and jams during fixing.

FIG. 60 is a schematic front sectional view of a copying machine as an electric device of the third conventional example. In the figure, reference numeral 150 denotes an apparatus main body, and an original placing table 151 as a lid member is provided on the upper portion of the apparatus main body 150. Inside the apparatus main body 150, the reader unit 152 on the upper side and the printer unit 153 on the lower side are provided.
It is divided into and.

The reader unit 152 includes a first mobile unit,
The second scanners 154 and 155 are provided so as to be horizontally movable. Further, in the reader unit 152, an imaging lens 156,
A charge coupled device 157, a laser scanner 158, an image processor 159 and the like are provided. Each of the first and second scanners 154 and 155 has a light source, a mirror, etc.
In order to maintain the optical path A length from 51 to the charge coupled device 157 at a predetermined value, the angle, height, etc. in the horizontal plane are positioned. In addition, the first and second scanners 154 (not shown)
It has a CPU for controlling a motor for driving 155 and the like.

In the printer section 153, a photosensitive drum 160, a developing device 161, a fixing device 162 and the like are provided, and a paper feeding cassette 163 is installed.

In the above structure, when a document (not shown) is placed on the document table 151 and a copy button (not shown) is operated, the first and second scanners 154 and 155 move horizontally, and the image light thereof is formed by the imaging lens 156. It is photoelectrically read by the charge-coupled device 157 via.

On the other hand, the image scanner 158 emits a laser beam based on the read image to form a latent image on the photosensitive drum 160. This latent image is visualized by the developing device 161, and then transferred to the transfer paper conveyed from the paper feed cassette 163. An image is fixed on the transfer paper by a fixing device.

By the way, maintenance such as adjustment and cleaning of the laser scanner 158, the image processor 159, the image forming lens 156, the charge-coupled device 157, etc. is performed by removing the document placing table 151 from the apparatus main body 150. For these adjustments, there is also an item to check with the power of the apparatus main body 150 turned on. In addition, the operator may forget to turn off the power.

FIG. 61 shows a light-shielding device of the fourth conventional example (Japanese Patent Laid-Open No. Sho 6-62).
2-205381, Jitsukai Sho 64-51952, etc.). 170 is an arch-shaped shading frame, and the shading frame 170
The vertical portions 172 are provided at both ends of the horizontal portion 171. A lens 174 held by a lens barrel 173 is provided in the light shielding frame 170.

Between the vertical portion 172 and the lens barrel 173, an expandable and contractible side light-shielding member 175 composed of a belly or the like is provided.

Then, the image light reflected on the original surface (not shown) passes through the lens 174 and is imaged on the photoconductor, CCD or the like. On the other hand, the lens 174 moves within the light shielding frame 170 depending on the reading and copying magnification.

FIG. 62 shows a fifth conventional example (Japanese Patent Laid-Open No. 63-260).
65 and JP-A-63-79470).
A full-speed mirror unit 180 and a half-speed mirror unit 181 are horizontally movable below a document table glass (not shown). The full-speed mirror unit 180 has a lamp (not shown), a substrate 182 as a long light-transmitting means, and a first mirror 183. A slit 186 is provided on the substrate 182 along the longitudinal direction. Further, the half-speed mirror unit 181 has second and third mirrors 184 and 185.

An image forming unit 187 is provided below the platen glass. The imaging unit 187 is the support base 1
An image forming lens 189 as an optical unit and a long reading unit 190 are provided on a support 188. In the reading means 190, charge-coupled devices are arranged along the longitudinal direction.

The reading means 190 is the arithmetic unit 1
It is connected to the output device 192 via 91. A value corresponding to a predetermined state is previously stored in the arithmetic unit 191.

In the above structure, the lamp is turned on to illuminate the document on the platen glass. The formed image light S passes through the slit 106, is reflected by the first, second and third mirrors 183, 184 and 185, and is photoelectrically read by the reading means 190 via the imaging lens 189.

In such an image reading apparatus, the image light S
In order to read the image with high accuracy, it is necessary to accurately assemble and adjust the relative positional relationship of each element from the document surface to the reading unit 190 and accurately form the image light S at a predetermined position of the reading unit 190. Come on.

For example, as an adjustment item of each element, the slit 186 in the scanning direction A of the full speed mirror unit 180 is used.
And the parallelism and conformity (hereinafter referred to as right angle and synchronous adjustment) between the center line a of the slit 186 and the center line b in the longitudinal direction of the reading unit 190.

Conventionally, such adjustment is carried out by holding the jig chart 193 on a platen glass (not shown) in a production line, illuminating it with a lamp, and reading the image of the jig chart 193 by the reading means 190. Then, the output signal of the reading means is processed by the arithmetic unit 191 and confirmed by the output unit 192. Then, in response to this, the operator manually displaces the reading unit 190 to adjust the relative positional relationship.

FIG. 63 is a front sectional view showing a sixth conventional example. Reference numeral 800 is a photosensitive drum as a photosensitive member that rotates clockwise in the drawing. A charger 8 is provided around the photosensitive drum 800.
01, a developing device 802, a cleaner 803 and the like are provided.

On the other hand, a frame 804 is provided above the photosensitive drum 800, and on the frame 804, a mirror 805 as an exposing means, a light emitting body 806 as a discharging means,
A reflector 807 and a light shield 808 are provided.

In the above structure, the charging device 801 uniformly charges the surface of the photosensitive drum 800, while the image light X is reflected by the mirror 805 and corresponds to the transfer magnification, the size of the transfer paper, etc. of the photosensitive drum 800. A predetermined area is irradiated and an electrostatic latent image is formed. The electrostatic latent image is developed by the developer in the developing device 802 and then transferred to a transfer paper (not shown).

The static elimination light Y of the light emitter 806 is reflected by the reflector 8
It is reflected by 07 and irradiated to the photosensitive drum 800. At this time, the light emitting body 806 or the light shielding plate 808 moves in the axial direction of the photosensitive drum 800 in accordance with the transfer magnification and the transfer paper size, and removes the electric charges outside the irradiation area of the image light A.

The irradiation range of the static elimination light Y projected on the photosensitive drum 800 by the light emitter 806 is as follows.
At the time of reduction, the light emitter 806 is in the position A as shown in FIG. 64, and is a “range E” in which a straight line extending from the point A to both ends of the reflector 807 is extended to the apparent photosensitive drum position 800a. Become. This is located outside the irradiation region l ₁ of the image light X in the “range G” when rewritten to the actual photosensitive drum 800. Further, at the time of enlargement, the light emitting body 806 is at the position B, and the irradiation range of the light removing body Y of the light emitting body 806 is “range F” and “range H” and is located outside the irradiation area l ₂ of the image light X. .. As a result, charges outside the irradiation area of the image light X on the photosensitive drum 800 are removed.

In this way, the transfer paper is prevented from being contaminated due to waste, scattering and adhesion of the developer.

FIG. 65 is a front sectional view showing a seventh conventional example. Reference numeral 820 is a photosensitive drum as a photosensitive member that rotates clockwise in the drawing. A charger 8 is provided around the photosensitive drum 820.
21, a developing device 822, a cleaner 823 and the like are provided.

On the other hand, a frame 824 is provided above the photosensitive drum 820, and on the frame 824, a mirror 825 as an exposing means, a light emitting body 826 as a discharging means,
A reflection plate 827 and a light blocking plate 828 as a polarization means are provided. Further, it has moving means (not shown) such as a cam for moving the light emitting body 826 or the light shielding plate 828 separately.

In the above structure, the charger 821 uniformly charges the surface of the photosensitive drum 820, while the image light X is reflected by the mirror 825 and corresponds to the transfer magnification, the size of the transfer paper, etc., of the photosensitive drum 820. A predetermined area is irradiated and an electrostatic latent image is formed. The electrostatic latent image is developed by the developer in the developing device 822 and then transferred to a transfer paper (not shown).

The static elimination light Y of the light emitting body 826 is reflected by the reflection plate 8
It is reflected by 27 and is irradiated onto the photosensitive drum 800. At this time, the light emitting body 806 or the light shielding plate 808 moves in the axial direction of the photosensitive drum 800 in accordance with the transfer magnification and the transfer paper size to polarize the static elimination light Y, and charges outside the irradiation area of the image light X are charged. Remove.

The photosensitive drum 8 is moved by the movement of the light emitter 826.
The irradiation range of the static elimination light Y projected on 20 is as follows. At the time of reduction, the light emitter 826 is at the position A as shown in FIG. 66, and is a “range E” in which a straight line extending from the point A toward both ends of the reflection plate 827 is extended to the apparent photosensitive drum position 820a. Become. This is the actual photosensitive drum 820
When it is rewritten to, it is located outside the irradiation area l ₁ of the image light X in the “range G”. In addition, the luminous body 826 is B when enlarged.
The irradiation range of the static elimination light Y of the light emitting body 826 is “range F” and “range H”, and is located outside the irradiation area l ₂ of the image light X. As a result, the photosensitive drum 82
The charges outside the irradiation region of the image light X on 0 are removed.

In this way, the transfer paper is prevented from being contaminated due to waste, scattering, and adhesion of the developer.

[0047]

However, in the above-mentioned first conventional example, since the sphere 129 projects to the outside of the spiral groove 126, the wires 118 and 123 are curved so as to avoid the sphere 129 as shown in the figure. It will wind around the drive pulleys 110 and 111.

As a result, the wires 118 and 123 are irregularly displaced during the rotation of the drive pulleys 110 and 111 to vibrate the illumination unit 103, and the movement accuracy thereof is lowered.

Further, since the ball 129 makes point contact with the wires 118 and 123 to bend the wires 118 and 123, the stress is concentrated on the bent portions due to the tension of the wires 118 and 123, and the durability of the wires 118 and 123 is improved. Sex decreases.

However, the second conventional example had the following problems. Static elimination lamps 13 on the upstream and downstream sides of the image area
Since 3 and the lamps 138 for static elimination on both sides are separately provided, the number of parts and the cost are increased due to the increase in the number of parts.

Further, since the lamp 138 itself is moved, there is a problem that the wiring 139 is caught by the peripheral mechanism or is broken.

In the third conventional example, the CPU malfunctions due to some cause during maintenance, or the operator accidentally touches the copy button, so that the first and second scanners 154 and 155. May move.

As a result, the workers are the first and second scanners 1
There is a risk that a hand may come into contact with 54 or 155 to cause an injury, or the positioning accuracy of the first and second scanners 154 and 155 may be deviated.

However, in the fourth conventional example, since the area Z between the horizontal portion 171 and the lens barrel 173 is not shielded, external light penetrating therethrough adversely affects the image light.

As a result, there has been a problem that defects such as white spots and insufficient density occur in the copied image.

However, in the fifth conventional example, vibration in the market,
When the relative positional relationship fluctuates due to a shock or the like and the image light cannot be accurately formed on the reading unit 110, there is no jig for adjustment unlike the production line, and therefore an actual output image after image formation is performed. There is no choice but to adjust manually little by little while watching.

Therefore, there has been a problem that a great deal of time and labor are required for the work of correcting the image forming position.

In the sixth conventional example, the optical path length from the light emitter 806 to the surface of the photosensitive drum 800 is changed by the movement of the light emitter 806, and when the light emitter 806 is at the position B, the optical path length is bar Be. ₁ , bar Be ₂ , bar Be ₃ , bar Be ₄ , and when the light emitter 806 is at the position A, bar A
f ₁ , bar Af ₂ , bar Af ₃ , and bar Af ₄ .

Further, when the light emitter 806 irradiates the photosensitive drum 800, the angle between the surface of the photosensitive drum 800 and the static elimination light Y also varies from ∠E1 to ∠E4 to ∠F1 depending on the position of the light emitter 806.
~ ∠ Change to F4. In this way, when the optical path length and the irradiation angle of the static elimination light Y are changed, the intensity of the light emitted from the light emitter 806 is the same, so the light amount on the surface of the photosensitive drum 800 is changed, and the light amount is increased or decreased and the light amount distribution difference is generated.

Further, in the seventh conventional example, a light emitting body 826
Alternatively, since one of the light shielding plates 828 is moved to polarize the static elimination light Y, the amount of movement thereof is very large, a large moving force is required, and the load resistance applied to the moving means increases. As a result, the mechanical properties of the moving means change and wear,
There have been problems such as occurrence of troubles such as breakage, and reduction of movement accuracy due to reduction of movement force.

Further, it is necessary to secure a space for the light emitter 826 and the light shielding plate 828 to largely move, which tends to increase the size of the entire apparatus.

The first invention is to solve the problem of the first conventional example, and the wire can be wound in a circular shape along the winding surface of the driving member, and the wire can be wound on the wire at the contact portion with the fixing member. It is an object of the present invention to provide a drive device that can relieve stress concentration.

A second invention is to solve the problem of the second conventional example, and an object thereof is to provide an image forming apparatus in which the number of parts is reduced and there is no wiring trouble of the second charge eliminating means.

The third invention is to solve the problem of the third conventional example, and provides an electric device in which the moving body cannot move when the lid is moved from the localization value of the device body. Has a purpose.

The fourth invention is to solve the above-mentioned problems of the fourth conventional example, and an object thereof is to provide a light-shielding device capable of shielding the region between the lens and the horizontal portion.

The fifth invention is to solve the problem of the fifth conventional example. When the accuracy of the image light image forming position is lowered, the image light image forming position is automatically returned to the localization value. An object of the present invention is to provide an image reading device capable of performing the above.

The sixth invention is to solve the problem of the sixth conventional example, and uniformizes the static elimination light reaching outside the irradiation area of the image light regardless of the position of the static elimination means or the irradiation angle to the photoconductor. It is an object of the present invention to provide a lighting device that can be

A seventh invention is to solve the problem of the seventh conventional example, and an object thereof is to provide an illuminating device capable of suppressing the load resistance applied to the moving means and further downsizing the entire device. There is.

[0069]

In order to achieve the above object, a first invention has a track member, a movable body movably provided along the track member, and a circular winding surface, and A driving device having a driving member for rotationally driving, fixing a wire rod wound on a winding surface to a moving body, and providing a fixing member for fixing a part of the wire rod to the driving member. An arcuate surface which is set to have substantially the same curvature as the attaching surface and which is substantially flush with the winding surface is formed.

The second aspect of the present invention is capable of performing a variable magnification process on a photosensitive member that is charged while moving in a predetermined direction, and image light, and
An image forming apparatus having an exposing unit for irradiating a charged photoreceptor with image light to form an electrostatic latent image, and a developing unit for converting the electrostatic latent image into a visible image by a developer is used. A first light removing means for irradiating the light flux of the light source to the upstream side and the downstream side in the moving direction of the photoconductor across the image area to remove charges, and the light flux of the light source for separating the image area. And a second static eliminator for irradiating charges on both sides orthogonal to the moving direction of the photoconductor to remove charges, and the second static eliminator is orthogonal to the moving direction of the photoconductor corresponding to the magnification changing operation of the exposure unit. It is characterized in that it is configured to move.

In order to achieve the above object, a third aspect of the invention is to provide an apparatus body, a movable body housed in the apparatus body so as to be movable therein,
In an electric device having a lid member provided at a localization value of the device body, the moving body is configured to be movable only when the lid member is at the localization value.

In order to achieve the above-mentioned fourth object, a fourth invention is to provide an arch-shaped light-shielding frame in which vertical portions are formed at both ends of a horizontal portion, and a lens is arranged in the light-shielding frame so as to be perpendicular to the lens. In a light shielding device in which a side light shielding member is provided between the lens and the horizontal portion, an upper light shielding member is provided between the lens and the horizontal portion.

Further, the fifth invention has a light-transmitting means through which the image light passes, and a reading means for photoelectrically reading the image light,
In an image reading device in which the light passing means and the reading means are positioned relative to each other so that the image light is imaged at a predetermined position of the reading means,
A detection unit that detects the image formation position of the image light based on the reading result of the reading unit, and an image formation position of the image light when the detection unit detects that the image light is not imaged at a predetermined position. And adjusting means for automatically returning to the predetermined position.

A sixth aspect of the invention is a photosensitive member that is uniformly charged,
An exposing unit that irradiates a predetermined area of the photosensitive member with image light after charging, and a charge outside the irradiation area of the photosensitive member with the image light,
In the illuminating device having a charge removing unit for irradiating the charge removing light to the outside of the irradiation region, a light amount adjusting unit for uniformizing the light amount of the charge removing light reaching the photoconductor is provided.

A seventh aspect of the invention is to provide a uniformly charged photoreceptor.
Exposure means for irradiating a predetermined region of the photoconductor after charging with image light, static erasing means for generating static charge for removing charges outside the image light irradiation region of the photoconductor, and irradiating with the static charge light In the illuminating device having the deflecting means for deflecting the light to the outside of the region, the moving means for absolutely moving both the static eliminating means and the deflecting means when deflecting the static eliminating light is provided.

[0076]

In the first aspect of the invention, the driving member rotates to pull the wire rod, and the driving force causes the moving body to move along the track member. When the drive member rotates, the fixing member circumferentially positions a part of the wire rod with respect to the winding surface.

The wire rod is wound along the arcuate surface of the fixed member with substantially the same curvature as the winding surface. Further, the circular arc surface and the wire material come into line contact with each other, and the stress is dispersed.

In the second invention, the photosensitive member is charged while moving. The charges are removed by the first charge eliminating means on the upstream side and the downstream side of the image area. Electric charges are removed from both sides of the image area by the second charge eliminating means. The second charge eliminating means moves in accordance with the magnification changing operation of the exposing means.

The electrostatic latent image is visualized without adhering the developer to the charge eliminating area. The light source is single and does not move.

In the third invention based on the above configuration, when the lid member is moved from the localization value, the moving body cannot move.

In the fourth invention based on the above structure, the region between the lens and the horizontal portion is shielded by the upper light shielding member.

Further, in the fifth invention, the image light which has passed through the light transmitting means is imaged at a predetermined position of the reading means, and the reading means photoelectrically reads the image light. On the other hand, the detection means detects the image formation position of the image light. Then, when the detecting means detects that the image light is not imaged at the predetermined position, the adjusting means operates and the image forming position is automatically returned to the predetermined position.

In the sixth aspect of the invention, the charge eliminating light emitted by the charge eliminating means is applied to the outside of the image light irradiation area of the photoconductor to remove the electric charge. The amount of this static elimination light is made uniform when it reaches the photoconductor by the adjusting means.

The operation of the seventh aspect of the invention is that the exposing means irradiates a predetermined region of the photosensitive member with image light to form an electrostatic latent image. The static elimination light generated by the static elimination means is polarized by the polarization means to the outside of the irradiation region of the image light, and the electric charges at the site are removed.

Since the moving means absolutely moves both the charge eliminating means and the polarizing means to polarize the charge eliminating light,
The amount of movement of each of the charge eliminating means and the polarizing means is small.

[0086]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the first invention will be described with reference to the drawings. The figure shows an example applied to an optical system such as a copying machine or an image reader. In the figure, reference numeral 1 denotes an exterior box of the apparatus main body, and a document table glass 2 is horizontally provided on the top of the exterior box 1. Inside the outer box 1, that is, the side plates 11 and 1 facing each other
Between the two, optical rails 13, 1 as a pair of track members
4 are provided in parallel and horizontally.

3 is an illumination unit as a moving body,
The illumination unit 3 includes a block 15 slidably mounted along the optical rail 13, a block 50 slidably mounted on the optical rail 14, and a plate-shaped housing 4 connecting the blocks 15 and 50. Have. Thus, the illumination unit 3 is horizontally reciprocally movable in the direction of arrow B along the optical rails 13 and 14.

The illumination unit 3 includes two fluorescent light sources 5
A first mirror 6 that receives the reflected light from the document surface, a second mirror 7 that bends the light from the first mirror in the horizontal direction, and the reflected light from the second mirror is collected and connected to the light receiving surface of the solid-state light receiving element 8. A lens 9 for imaging is mounted. Further, on the back of the solid-state light receiving element 8, there is an adjusting table 10 for adjusting the position, angle, etc. of the light receiving element.
Is provided.

Support arms 34 and 35 are provided on the side plate 12, and the support arms 34 and 35 support a drive shaft 33 arranged parallel to the illumination unit 3 so as to be rotatable and slidable in the axial direction. .. Drive pulleys 21 and 30 as drive members are provided at both ends of the drive shaft 33.

On the other hand, the optical rail 13 on the side plate 11 side.
Near the end of the upper deflection pulley 24, the lower deflection pulley 22
A take-up pulley 23 is provided, and the take-up pulley 23 is connected to a motor 27 via an electromagnetic clutch 26.

Then, one end of a wire 18 as a wire is fixed to the block 15 by a terminal 19. After this wire 18 is wound around the drive pulley 21 a plurality of times,
The other end is connected to the block 15 by a spring 25 via the lower deflection pulley 22, the winding pulley 23, and the upper deflection pulley 24.

On the other hand, one end of a wire 29 as a wire is also fixed to the block 50 by a terminal 28. Wire 2
9 is wound around the drive pulley 30 a plurality of times, folded back to the side plate 11 side, and then folded again by the deflection pulley 31, and then the spring 3
It is connected to the block 50 via 2.

FIGS. 3A, 3B and 4A show a wire 18 fixing mechanism. The circular winding surface of the drive pulley 21, that is, the outer peripheral surface 51, has a fixing groove 52 having a wedge-shaped cross section.
Is provided. Further, a pair of flat surfaces 53 is provided along the circumferential direction at a position sandwiching the fixed groove 51.

On the other hand, the wire 18 is fixed with a fixing claw 54 as a fixing member having a substantially wedge-shaped cross section.
4 is inserted into the fixing groove 52. The fixed claw 54 has an arcuate surface 55 having substantially the same curvature as the outer peripheral surface 51. When the fixed claw 54 is inserted into the fixed groove 52, the arcuate surface 55 and the outer peripheral surface 51 are substantially flush with each other, that is, located on the same circumference. There is.

This fixing mechanism is also provided on the side of the wire 29 and the drive pulley 30.

In the above structure, the motor 27 rotates in the forward and reverse directions, and the driving force thereof pulls and drives the wire 18, which is transmitted to the block 15 side of the illumination unit 3. Further, the drive shaft 33 is rotated by the pulling of the wire 18, and the wire 29
Is towed and transmitted to the block 50 side of the lighting unit 3.

By the driving force thus transmitted,
The illumination unit 3 reciprocates on the optical rails 13 and 14 in the direction of the arrow to illuminate the document on the document table glass 2.
As a result, the image of the original is photoelectrically read. The read image is developed by a printer or the like (not shown).

Since the fixing claw 54 is inserted into the fixing groove 52 when the wire 18 is pulled, the wire 18 is reliably positioned in the circumferential direction with respect to the outer peripheral surface 51. Therefore, the driving force of the motor 27 can be efficiently transmitted to the lighting unit 3. Further, since the drive pulley 30 side is also configured in the same manner, the driving force transmitted to the blocks 15 and 50 is kept uniform, and the illumination unit 3 moves in parallel with high accuracy.

The wire 18 (29) is connected to the drive pulley 2
1 (30), even if it contacts the circular arc surface 55 of the fixed claw 54 when it is wound or wound up, the wire 18 (2
In 9), the same curvature as the outer peripheral surface 51 is always maintained. Therefore, the pulling operation of the wire 18 (29) is reliably performed, the vibration of the lighting unit 3 can be prevented, and the accurate movement can be maintained.

Further, since the arcuate surface 55 is in line contact with the wire 18 (29), the stress generated by the tension of the wire 18 (29) can be dispersed. Therefore, the wire 18 (2
The durability of 9) can be improved.

Further, when fixing the wire 18 (29), the workability is improved because a simple operation of inserting the fixing claw 54 into the fixing groove 52 is sufficient.

Furthermore, the drive pulleys 21 and 30 are also simple in shape, have good moldability, and are easy to obtain roundness.

4 (B) and 4 (C) are a plan view and a front view of the fixed claw 60, respectively. The fixed claw 60 is provided with a pair of arc surfaces 61. The curvature of the pair of circular arc surfaces 61 is the same as the outer peripheral surface 51.
It is set to be almost the same as and is located in the opposite of each other. In addition, the fixing groove of the drive pulley (not shown) is formed by the fixing claw 6
It has a shape that allows 0 to be absorbed.

Also in this embodiment, the same operational effect as in FIG. 3 can be obtained. Further, in the present embodiment, when the arcuate surface 61 and the fixing groove do not coincide with each other, if the maximum wire 18 (29) is twisted by 90 degrees, one of the arcuate surfaces 61 coincides with the fixing groove, so that the winding work is further performed. The property is improved.

Although not shown, if the fixing claw has a barrel shape, it is not necessary to align the fixing claw with the fixing groove, and the wire can be wound at any position of 360 degrees, so that the wire winding workability is further improved.

FIG. 5 shows another embodiment of the fixed claw 62. An arcuate surface 63 having the same curvature as the outer peripheral surface 52 of the drive pulley 21 is formed on the fixed claw 62, and a lower surface 64 curved in the same direction as the arcuate surface 63 is provided on the opposite side.

The bottom surface 66 of the fixing groove 65 has the same curvature as that of the outer peripheral surface 52, and has the same depth as a whole. Others are configured similarly to the first embodiment, and have the same operation and effect. Also,
Since the depth of the fixing groove 65 is uniform, the moldability is improved and the roundness is increased.

6 and 7 show the second invention. FIG. 6 is a schematic configuration diagram of a copying machine to which the present invention is applied. In the figure, reference numeral 70 denotes a document placing glass horizontally provided on the upper part of the apparatus main body 99. Inside the main body of the apparatus, that is, below the original placing glass 70, a lamp 71 that is movable in the horizontal direction,
An optical system E as an exposing means is provided, which includes reflecting mirrors 72, 73, 74, a lens system 75, fixed reflecting mirrors 76, 77, 78 and the like. The lens system 75 can obtain an image having a different size from a copied original having the same size by adjusting the position or the like to change the copy magnification. The scaling may be performed stepwise or continuously.

Below the optical system E, there is provided a photoconductor drum 79 as a photoconductor that rotates in the direction of arrow F in the figure with a predetermined space therebetween. Around the photosensitive drum 79, a primary charger 80, a developing device 81 as a developing means, a transfer charger 82, a cleaner 83, etc. are provided along the rotation direction.

Below the reflection mirror 78, a pair of frame-erasing reflection mirrors 84 are provided as second charge eliminating means.
As shown in FIG. 7, the frame-erasing reflection mirrors 84 are located at both ends of the photosensitive drum 79 in the axial direction, and are configured to move substantially horizontally by the motor 85.

Further, a blank reflecting mirror 86 as a first charge eliminating means is provided between the frame erasing reflecting mirror 84 and the photosensitive drum 79. This blank reflection mirror 86
Has a curved surface shape and is movable in the horizontal direction by a driving means (not shown).

Further, a blank lamp 87 as a single light source is provided above the photosensitive drum 79. The term “single” as used herein means that the blank reflecting mirror 86 and the frame erasing reflecting mirror 84 emit light beams in common, and thus are common. The blank lamp 87 is shown in FIG.
As described above, they are fixedly arranged corresponding to both ends of the photosensitive drum 79.

A light flux regulating plate 88 is provided between the blank lamp 87 and the frame-erasing reflection mirror 84 in parallel with the axis of the photosensitive drum 79. Slits 89 are provided on both ends of the light flux regulating plate 88.

In the lower part of the apparatus main body 99, a paper feed cassette 90, a paper feed roller 91, a registration roller 92, a conveyor belt 93, a fixing device 94, a discharge roller 95, and a tray 96.
Is provided.

Next, the operation of the above embodiment will be described. First, the surface of the photosensitive drum 79 is uniformly charged by the primary charger 14, and then rotated in the arrow direction.

On the other hand, before the irradiation of the image light G, the blank reflection mirror 86 is at the position indicated by the solid line, and the luminous flux of the blank lamp 87 is radiated with a predetermined width on the upstream side of the photosensitive drum 79 corresponding to the leading end of the document. After that, when the position where the image exposure should be started is reached, the blank reflection mirror 86 is retracted to the position shown by the chain line in the figure. At this time, the light flux regulating plate 88 is at the outermost side, and the blank lamp 87 is provided to the frame-erasing reflection mirror 84.
Does not reach.

Original 9 placed on original placing glass 70
7 is illuminated by the lamp 71, and its image light G is guided onto the photosensitive drum 79 by the reflection mirrors 72 to 74, the lens system 75, and the reflection mirrors 76 to 78.

The lamp 71 and the reflection mirrors 72, 73, 7
4 is moved in the direction of the arrow at a predetermined speed to move the original 97.
To scan.

As a result, electrostatic latent images corresponding to the original image are sequentially formed on the surface of the photosensitive drum 79. Here, when changing the copy magnification to the reduction side, the lens system 75
Moving from the position of the solid line to the position of the dotted line, the image light G on the photosensitive drum 79 of the document 97 changes from the area H to the area J. That is, on the surface of the photoconductor drum 79, the unexposed areas on both sides of the image area increase from the area K to the area N.

Then, when the blank reflecting mirror 86 is moved to the rear end of the area to be image-exposed on the photosensitive drum 79, the blank reflecting mirror 86 is returned to the solid line position in the figure to remove the electric charge at the position corresponding to the rear end of the original.

After that, the developing device 81 visualizes the electrostatic latent image on the photosensitive drum 79 with the developer. On the other hand, the paper feed roller 91 feeds the transfer paper stored in the paper feed cassette 90 to the registration roller 92 by rotation.

The registration roller 92 is the photosensitive drum 79.
The transfer paper is fed to the surface of the photoconductor drum 79 at a timing so that the upper visible image and the transfer paper coincide with each other.

An image on the surface of the photoconductor drum 79 is transferred onto the transfer paper by the transfer charger 82, and is sent to the fixing device 94 by the conveyor belt 93.

The fixing device 94 has a heating roller 94a and a pressure roller 94b, and fixes the image on the transfer paper as a permanent image by heating and pressing the transfer paper.

The transfer sheet on which the image has been fixed is sent to a discharge roller 95, and is discharged onto a tray 96 provided outside the copying apparatus by the discharge roller 95.

The residual toner on the surface of the photosensitive drum 79 is removed by the cleaner 83, and the process proceeds to the next copying step again.

As described above, in the second invention, the charge on the upper and downstream sides of the image area of the photosensitive drum 79 and the charge on both sides are removed by the light flux of the single blank lamp 87. There is.

Therefore, the number of parts is small, the number of assembling steps is reduced, and the manufacturing cost can be reduced.

Further, since the light flux regulating plate 88 moves and the blank lamp 87 remains fixed, the wiring of the blank lamp 87 is not caught in the periphery or disconnected.

In the above embodiment, in order to move the frame-erasing reflection mirror 84, the motor 85 is not used,
If the drive mechanism of the lens system 75 is used in conjunction with each other, the drive source dedicated to the blank exposure apparatus is not required, and the structure is further simplified.

As shown in FIG. 8, a blank lamp 87 is disposed so as to face the photoconductor drum 79, and a light flux restricting plate 98 with a slit 97 provided between the blank lamps 87 determines the charge eliminating regions on both sides of the photoconductor drum 79. You may.

Further, the area of the photosensitive drum 79 illuminated by the blank lamp 87 is an area where the image is not exposed, that is, a non-image area, but the edge of the image area is illuminated in advance according to the size of the copy paper. Frame-erasing reflective mirror 8
4 or the position of the slit 88 can be adjusted to eliminate the electric charge at the edge of the image area, and as a result, the edge of the copy paper can be trimmed to white to prevent excess toner from adhering.

Next, an electrophotographic copying machine to which the third invention is applied will be described. 9 is a front sectional view, FIG.
FIG. 4 is a partial perspective view. The inside of the apparatus main body 500 is divided into an upper reader section 501 and a lower printer section 502.

Inside the reader section 501, the lamp 50
3, a first scanner 505 as a moving body having a mirror 504 and a second scanner 508 as a moving body having mirrors 506 and 507 are provided. First scanner 5
05 and the second scanner 508 are guide rails 509 and 51.
It is provided so as to be capable of reciprocating in the horizontal direction along 0.

Further, the fixed pulley 5 is provided in the leader portion 501.
11 and 512 are provided, and fixed pulleys 511 and 512 are provided.
A wire 513 is wound around. In addition, the reader unit 5
01 is an optical drive motor 51 having a drive pulley 514.
5, and a deflection pulley 516 is further provided.
The wire 513 is wound around the drive pulley 514 and the deflection pulley 516, and a part of the wire 513 is fixed to the first scanner 505 with a metal fitting and is also wound around the pulley 517 of the second scanner.

The optical drive motor 515 is the GND line 51.
8 is connected to the optical motor driver 519 via the power supply line 8 and is also connected via the power supply line 520. The power supply line 520 is provided with a switch 521. The optical motor driver 519 is controlled by the CPU 522 and is supplied with power from the DC power supply 523.

In addition, the imaging lens 5 is provided in the reader unit 501.
24a and a charge coupled device 525a are provided. And
Mirrors 504, 506, 507 from the document table (described later)
The angle, height, etc. in the horizontal plane of the first and second units 505, 508 are positioned so that the optical path length from to the charge coupled device 525 becomes a predetermined value.

A plate-shaped image processor 524 and a laser scanner 525 are provided in the reader section 501 below the moving regions of the first and second scanners 505 and 508. The laser scanner 525 has a polygon mirror and the like.

On the other hand, FIG.
As shown in FIG. 2, the top plate 527 is provided with an opening 528, and a document placing table 526 as a lid member is attached substantially horizontally at a fixed position to close the opening. An interlock lever 529 is provided in the front leader section 501. The interlock lever 529 is rotatable in the horizontal direction around the shaft 530, and one end side 531 thereof is located in the opening 528. An abutting portion 532 protruding upward is provided on the one end side 531. Also, the interlock lever 52
A pressing piece 533 is provided on the other end side 532 of 9. A spring 534 is connected to the pressing piece 533 and biases the interlock lever 529 counterclockwise in the drawing.

An operating lever 535 is provided near the pressing piece 533.
A switch 521 having is located. Note that 536
Is a claw piece for pressing the document table 526. In addition, FIG.
As shown in FIG. 3, an openable document holder 537 is provided on the top plate 527 of the apparatus body 500, and a power source 538 is provided on the side surface of the apparatus body 500. Reference numeral 539 is an operation button.

A mirror 54 is provided in the printer unit 502.
0, a photosensitive drum 540a, a developing device 541 and the like. Further, a transfer sheet 542 is provided below the photosensitive drum 540a.
A paper feed cassette 543 storing the above is attached. Also,
A conveyor belt 544 and a fixing device 545 are provided. The laser scanner 525 is positioned to keep the distance from the polygon mirror to the photosensitive drum 540a constant.

In the above structure, the document placing table 52 is usually used.
6 blocks the opening 528 as shown in FIG.
The contact portion 532 of the interlock lever 529 comes into contact with the document placing table 526 to regulate the rotation of the interlock lever 529. Therefore, the interlock lever 529
Is in the position shown by the solid line in FIG. 12, and the switch 521 is in the closed state.

Therefore, when the manuscript is placed on the manuscript table 526 and the operation button 539 is operated, the current supplied from the optical motor driver 519 according to the instruction of the CPU 522 reaches the optical drive motor 515 through the power feeding line 520. Then, the optical drive motor 515 rotates in the direction of arrow B. This rotation is transmitted to the first and second scanners 505 and 508 via the wire 513, and the first and second scanners 505 and 508 move in the arrow D direction.

Then, the lamp 503 illuminates the original, and the reflected light reaches the charge coupled device 525a via the mirrors 504, 506, 507 and the imaging lens 524a, and the image is read. The laser scanner 525 emits a laser beam corresponding to an image signal and forms a latent image on the photosensitive drum 540a via the mirror 540.

The latent image is visualized by the developing device 541 and then transferred onto the transfer paper 542 which is conveyed. And
It is fixed by the fixing device 545 via the conveyor belt 544.

Next, when the original placing table 526 is removed from the opening 528 (FIG. 13B), the interlock lever 52 is released.
9 rotates clockwise in FIG. 12, the switch 521 is opened, and the current supply from the power supply line 520 is cut off.

Then, the first and second scanners 505, 50
8, laser scanner 525, image processor 52
Perform maintenance such as adjustment and cleaning in Step 4. in this case,
Since the switch 521 is in the open state, the optical drive motor 515 does not operate even if the CPU 522 malfunctions, noise, or the operation button 539 is erroneously operated. Therefore, the first and second scanners 505 and 508 do not move, and the operator is not injured in the hand or the positioning accuracy is not affected. Therefore, stable image quality can be secured.

FIG. 14 shows a second embodiment. Document placing table 5
An electrode 550 made of a copper plate is attached to the lower surface side of 26. An insulating sheet 552 is provided on the frame body 551 on the apparatus body 500 side, and spring electrodes 553, 554 made of phosphor copper are fixed on the insulating sheet 552. The power supply line 520 is connected to the spring electrodes 553 and 554.

In the above structure, when the document table 526 is mounted on the opening, the spring electrodes 553 and 554 are closed by the electrode 550. On the other hand, the document table 526
When is removed, the spring electrodes 553 and 554 are opened.

Therefore, this embodiment also has the same effect as that of the first embodiment. The insulating sheet 552 is a member for preventing the power supply line 520 from falling to GND.

Although the above embodiment is applied to the copying machine, it can be applied to an image reader. Further, although the image light is photoelectrically converted and then applied to the photoreceptor, it may be directly applied.

Further, a blazed diffraction grating may be used as the charge coupled device.

FIG. 15 is a sectional view of a copying machine system showing an embodiment of the fourth invention. The copying machine system is roughly divided into three parts: a copying machine body B, an automatic document feeder A provided on the copying machine body B, and a sorter C placed beside the copying machine body B.

The process until a copy sheet is obtained will be briefly described with reference to FIG. When a document (not shown) is set on the tray 560 of the automatic document feeder A and the copy button is pressed,
Originals are automatically placed on the original glass 5 by rollers or belts.
It is conveyed onto 62. Then, the exposure device 563 in the main body B of the copying machine illuminates the original while moving along the original glass 562 in the direction of the arrow, and scans the entire surface of the original.

The image light formed as described above is the second light.
The light is reflected by the third mirror 564, passes through the zoom lens 1, and is reflected again by the fourth mirror 565 to form an image on the photosensitive drum 566.

Next, the method of forming the image light exposed on the photosensitive drum 566 and the movement of the lens 1 will be described with reference to FIG. FIG. 2 is a diagram showing lines of light that form an image on the photosensitive drum 566 from the document surface. The width n and m of the document surface is 2
The width n'and m'of the image forming surface of the photosensitive drum 566 is 97 mm, and the width 297 mm is 907 mm which can be copied at the same size (A
4 widths can be copied at the same size) Copy magnification is 50% to 20
Up to 0%. The lens used is a zoom lens. The coordinate system has x in the horizontal direction and y in the vertical direction as shown in FIG.

First, the equal magnification will be described. The lens moves to the position of the point O, which coincides with the image center line.
The light of widths n and m emitted by the exposure device 563 is imaged on the photosensitive drum 566 in the opposite directions such as n ′ and m ′ due to the characteristics of the lens 1. Taking advantage of this characteristic, a document contact reference is provided on the back side of the document glass 562 so that a copy image can be obtained from the front side of the copy paper.

Secondly, when trying to make a copy of 200%, the lens 1 moves from the point O to the point a. At this time, light of n and m widths on the original surface should be imaged on the photosensitive drum 566 with n ″ and m ″ widths, but the photosensitive drum 566 has n ′ and m ′ widths. Since it is limited, 200% of the copy image is actually obtained by expanding the widths n and m ₁ on the original surface to n ″ and m ₁ ″.

Thirdly, in the case of 50% copy, the lens 1 moves to the point b. The light having the widths n and m of the document surface is reduced to n ″ and m ″. Copy paper is the front standard, so 100%, 200%, 50%
The position of n does not change regardless of the magnification of%, and the lens 1 also moves linearly between a and b.

However, when the copy paper is fed with the central reference, it changes. As an example, the original is A4 and the copy paper is B5. Since the copy image is from the front of the copy paper, the light of widths n and m is formed as p'and q '.
Since the width of the photosensitive drum 566 is limited, p ', m'
Becomes

Similarly, in the case of 200%, n and m are p ″ and q ″.
In the case of 50%, p and q are obtained. The lens 1 has only moved in a straight line between a and b until now.
The moving range of the lens is a, b, c, d, and the movable range of the lens 1 is expanded to c, e, b, f.

Next, FIG. 17 is a plan view showing a light shielding device corresponding to the range of movement of the lens thus enlarged. The lens 1 is fitted to a lens moving shaft 403 whose both ends are supported by support plates 404a and 404b. The lens 1 is moved in the x direction via the belt 406 by the stepping motor 405 attached to the motor support plate 404b, and is moved for changing the magnification. The amount of movement at this time is controlled by the number of steps from the photo interrupter 407.

The above-mentioned components are arranged on the lens stage 402. Then, the lens stage 402 itself also moves in the y direction. The lens stage 402 is moved by a bearing 409 so that the lens stage 402 can be moved in parallel along a stage moving shaft 408, and is moved by a stepping motor 410 via a belt 411. The amount of movement at this time is controlled by the number of steps of the photo interrupter.

Motor for Zoom and Lens Stage 402
Each of the two motors for moving is used to move to an arbitrary magnification and a paper edge position. At that time, the shading device is attached to the light quantity correction plate 401 of the lens, and the back shading plate 41
2, a back light-shielding plate 413, a front light-shielding plate 414, and upper bellows 415 and lower bellows 416 as side light-shielding members on the front side.

The back light-shielding plate 412 is rotatably fixed to the light quantity correction plate 401, and the back light-shielding plate 412, 412 is attached to the tip thereof.
413 is also rotatably fixed. Torsion coil springs 422 and 423 are set at the respective rotation centers, and are set so as to generate a load in the arrow direction in the drawing. The tip end hits the inner wall R of the lens hood 567 so as to block light other than the light passing through the lens.

On the front side, the upper bellows 415 and the lower bellows 4
16 and the front light blocking plate 414 are used to block light. The front light-shielding plate 414 is also mounted with the torsion coil spring 421 in the direction of generating a load in the direction of the arrow so that the light-shielding plate is always pushed in the direction of the arrow.

Both ends of the upper and lower bellows 415 and 416 are held by the stays attached to the lens stage 402 and the lens base, and are arranged so as not to hit the upper and lower sides.

FIG. 18 is a perspective view showing an outline of the light shielding device on the front side. A lower bellows 416 and an upper bellows 415 are fixed by thermal caulking between a stay 568 arranged on the lens base side and a stay 569 arranged on the lens stage 402 side. Then, the light is expanded or contracted according to the movement of the lens stage 402 in the y direction to shield the light. Here, this bellows is made of polypropylene having a thickness of 1 mm, and is made to have rigidity so that it can be fitted in a predetermined position.

Next, the movement of the light shielding plate when the lens moves to 200% will be described. FIG. 19 shows a model diagram when the lens moves to point c. As mentioned earlier, lens 1
The lens stage 402 and the lens stage 402 are moved to predetermined positions by independent stepping motors. At this time, the light shielding hood (light shielding frame) 570 is slidably bent on the inner wall R of the lens hood 567. At that time, the light shielding plates 412 and 413 are configured so that they can be pushed out by the respective torsion coil springs 421 and 422 in the arrow direction. Therefore, no gap is created between the lens hood 567 and the light shielding plates 412 and 413. On the front side, the front light shielding plate 414 slides on the G surface of the bellows stay to shield light from the side of the lens. Before that, the light is shielded by bellows 415 and 416 attached to the lens base via stays.

FIG. 20 shows a model diagram when the lens moves to 50% at the third position. The mechanism for moving the lens 1 is as described above. Due to the spring force of the torsion coil springs 421 and 422, the light shielding hood 2 is moved by the movement of the lens 1.
As shown in the figure, the light shielding plate spreads and slides on the inner wall R of the lens hood 567, and the lens hood 567 and the light shielding hood 570.
I try not to create a gap with. The front side slides from the sliding surface G of the stay of the bellows 415 and 416 with the inner wall H of the lens hood 567 so that no gap is generated.

As described above, the maximum zoom ratio is 200% and the minimum zoom ratio is 50%.
The operation of the shading device at the same-magnification position is shown as a representative example. However, at the magnification between them, the shading device always moves so as not to create a gap with the shading hood 570.
In any copy mode, the vertical surface of the light-shielding hood and the regions on both sides of the lens are shielded.

FIG. 21 shows a model view of the optical system in the main cross section direction. (A) is the same size, (b) is 200%, (c) is 5
The state at the 0% position is shown.

The lens 573 is moved below and behind the light-shielding hood 570 with respect to the optical axis in accordance with the magnification change as described in the movement of the lens. At this time, the light shielding hood 570 is provided with a light shielding curtain (upper light shielding member) 571. The light-shielding curtain 571 is made of a material whose shape is freely deformed when hitting an object and has a good slipperiness, and the horizontal portion 572 has an arcuate slack and is arranged so as to always hang downward.

Therefore, no matter which magnification position the lens 573 moves to, the light-shielding curtain 571 comes into close contact with the upper part of the lens 573, and the horizontal portion 57 of the lens 573 and the light-shielding hood 570 is in contact.
There is no gap with 2. Further, the hanging amount of the light shielding curtain 571 is in close contact with the lens 573, and the optical path 5 is not affected at any magnification position.
I try not to disturb 74.

22 (A) and 22 (B) show attachment of the light shielding curtain 571 to the light shielding hood 570. The light shielding curtain 571 is attached to the entire area of the light shielding hood 570 so that the lens 573 is viewed from the front direction. The light shielding hood 570 has an arch shape in which vertical portions 575 are provided at both ends of the horizontal portion 572. In the present invention, the light shielding curtain 571 is made of a polyester cloth-like material with a thin coating of chloroprene rubber. The surface of the chloroprene rubber is arranged on the side that slides on the lens.

As described above, when the light-shielding curtain 571 hits an object, the light-shielding curtain 571 is freely deformed and adheres as if learning the shape of the mating member.
In addition, it is a member that has good slidability and diffusely reflects light. This member does not need to cover the entire surface of the light shielding hood 570 in the longitudinal direction.

Even if the lens 573 and the light shielding curtain 571 are not in contact with each other, the lens 57 is seen from the surface of the lens 573.
Since there is an overlap between 3 and the light shielding curtain 571, it is possible to cut the light other than the light such as flare that passes through the lens. This time, the shading hood 570 is attached only up to about 1/3 of the length.

FIG. 23 shows a state seen from the direction of arrow L in FIG. It is arranged so that the upper end of the lens 573 and the upper ends of the light shielding hood 570, the front light shielding plates 413, 414, and the lower bellows 416 coincide with each other. Therefore, the light blocking member also slides on the light blocking curtain to cut off the light in the area on the horizontal portion 572 side.

As described above, since the elastic member is hung from the flat surface of the light-shielding hood and slid with the light-shielding device, unnecessary light other than passing through the lens can be shielded. There is an effect that can be obtained.

FIG. 24A shows the second embodiment. Second
In this embodiment, a black polyester film 1501 is formed as a side light-shielding member, and the polyester film 1501
Was attached to the horizontal portion 572 of the light shielding hood 570 in a state of being inclined at an angle of about 30 ° toward the moving direction of the lens 1.

FIG. 24B shows the third embodiment. Third
In this embodiment, the brush 160 which is tightly bundled as the side light shielding member is used.
1, and the brush 1601 was attached to the horizontal portion 572 of the light shielding hood 570.

FIG. 25A is a front sectional view of an embodiment in which the image reading device of the fifth invention is applied to a copying machine, an image reader or the like.

In the figure, reference numeral 300 is a platen glass,
The platen glass 300 is fixed to an upper portion of an apparatus main body (not shown) substantially horizontally. Inside the main body of the apparatus, that is, below the platen glass 300, an arrow D is formed in parallel with the platen glass 300.
A full-speed mirror unit 301 and a half-speed mirror unit 302 that can move in any direction are provided. The full-speed mirror unit 301 has a lamp 303, a reflection shade 304, a substrate 305 as a light transmitting means, and a first mirror 306.

FIG. 25B is a plan view of the substrate 305, and the substrate 305 has a long dimension in the direction orthogonal to the arrow D direction. The substrate 305 is provided with slits 307 having the same width E along the longitudinal direction, and narrow portions 308 having a width F are provided at both ends of the slits 307. The substrate 305 is parallel to the platen glass 300, and the center line P of the slit 307 is positioned so as to be perpendicular to the scanning direction O.

On the other hand, the half-speed mirror unit 320 has second and third mirrors 309 and 310. A reading unit 311 is provided below the document table glass 300 and at substantially the same height as the third mirror 310. FIG. 26
FIG. 9A is a side view of the reading unit 311. Reading means 31
1 is an upright plate 312, and a plate 31
A pair of light receiving means 313 and 314 are arranged in parallel on the side surface of the second side along the vertical direction, that is, the Y direction. A large number of charge coupled devices 315 are arranged in the horizontal direction, that is, in the X direction between the light receiving units 313 and 314. Charge coupled device 3
Reference numeral 15 is configured by arranging ₅₀₀₀ (D _{1 to} D ₅₀₀₀ ) light receiving elements each having a pixel size of about 10 μm × 10 μm in one row in the X direction, and reading image information in the one-dimensional direction. The charge coupled device 315 is parallel to the slit 307, and the plate 312 is positioned so that the image light Z passing through the slit 307 is imaged at a predetermined position, that is, the charge coupled device 315.

FIG. 27 is a developed sectional view schematically showing the optical path from the document surface to the reading means 311 via the slit 307.

In the figure, the width G is the maximum original reading width (about 300 mm). For example, when an original is read at 400 dpi (dots / inch), the charge-coupled device 315 has 5000 pixels in the longitudinal direction, and therefore the original surface. In the above, an image of 5000 × 25.4 / 400 = 341.5 mm can be read, and there is a sufficient margin even if the error in the general horizontal direction, that is, the arrow X direction is taken into consideration.

On the other hand, the slit 307 is shown in FIG.
As described above, the dimension L'is wider than the maximum document reading width G and the width E (E = 0.5 to 10 mm). At both ends of the slit 307, the width F shown by the length M is F = 1.
A narrow portion 308 having a size of 0 μm to 1 mm is provided. The total length L of the slit 11 at this time (L = L + 2M)
Is the readable width of the reading means 312 (charge-coupled device 31
It is formed so as to be wider than the width H of FIG. 27 corresponding to the arrangement dimension 5).

An imaging lens 31 is provided in the optical path of the image light Z.
6 is provided. The imaging lens 316 is fixed on a substantially rectangular plate-shaped support stand 317 as shown in FIG. 26 (B), and one corner of the support stand 317 is fixed to the main body of the apparatus by a pin 318 as shown in FIG. Positioned on the base plate 328. The support 317 and the plate 311 are separate bodies. The optical axis of the imaging lens 316 is horizontal.

The corner portion adjacent to the pin 318 is supported by the movable pin 319, and the side edge side facing the pins 318, 319 is supported by the movable pin 320. In this way, the support base 317 is supported substantially horizontally at three points, and a pair of leaf springs 321 is provided near the opposing side edges.
Is pressed downward by.

FIG. 29 is a front sectional view showing the structure of the adjusting means W. As shown in FIG. A stepping motor 322 is provided below the support base 317, and a worm 323 is fixed to the output shaft of the stepping motor 322. The worm 323 meshes with the worm wheel 324.
A male screw 3 is provided on the shaft 325 of the worm wheel 324.
26 is provided. The male screw 326 is screwed into the female screw 327 of the support base 317.

The movable pin 31 is located at the center of the shaft 325.
9 is inserted and fixed. A similar adjusting means W is provided on the movable pin 320 side.

When the stepping motor 322 rotates in the direction of arrow I, the worm 323 also rotates in the direction of arrow I, and the worm wheel 324 rotates in the direction of arrow J. Then, the support 317 is displaced in the arrow K direction (downward). Therefore, the support 317 is moved in the height direction, that is, the arrow Q
The image forming position of the image light Z can be adjusted by displacing the image in the direction and rotating it.

When the support 317 is displaced in the direction of the arrow Y by the rotation of the stepping motor, the reading means 31
The image forming position on 1 can be vertically displaced.

FIG. 30 is a block diagram showing the main circuit configuration of the present invention. Reference numeral 350 denotes a CPU as a detection unit, and the CPU 350 is connected to the lamp 303 and the reading unit 311. Further, the CPU 350 is connected with stepping motors 322 and 322a and an operation unit 351.
The output waveform shown by the dotted line in FIG. 31 is stored in the memory of the CPU 350.

In the above structure, when the original 353 is placed on the original table glass 300 and the operation section 351 is operated to start reading, the lamp 303 is turned on and the full speed unit 301 and the half speed unit 302 are moved in the direction of arrow D. Reciprocates. Image light Z formed by illumination of the original 353
Passes through the slit 307 and is reflected by the first to third mirrors 306, 309, 310, and the imaging lens 3
An image is formed on the reading means 311 by 16.

The reading means 311 detects which light receiving element of the plurality of light receiving elements 313 and 314 arranged in the Y direction the image light Z is incident on, and outputs it to the CPU 350.

In FIGS. 31A and 31B, L ₁ , L
₂ , ... L _c ... L _n are light receiving elements which constitute the light receiving means 313, and R ₁ , R ₂ , ... R _c ... R _n are light receiving elements which constitute the light receiving means 314. The light receiving elements L _c and R _c are light receiving elements arranged on the same straight line as the arrangement of the charge coupled devices 315.

If the center of the reading slit 307 and the charge-coupled device 315 are displaced from each other and the image light Z is not imaged at a predetermined position, the pixel array 313 in the direction perpendicular to the longitudinal direction of the pixel. In pixels other than L _c and R _{c of} 314,
The images of the narrow portions M provided at both ends of the slit 307 in the longitudinal direction are incident, and a signal indicated by a solid line is output. This data is C
This is taken into the PU 350, the CPU 350 determines the image forming position shift, and the CPU 350 controls the stepping motors 322 and 322a according to the shift amount. As a result, the image of the narrow portion M is automatically driven into L _c and R _c of the pixel row, and the image light Z returns to a predetermined position.

If the adjustment by the CPU 350 is made at the same time when the power is turned on, the image light Z
Is highly accurately imaged on the charge-coupled device 315, and maintenance-free.

As another means for adjusting the image forming position, the relative position between the part constituting the substrate 305 of the full speed unit 301 and the part holding the mirror 306 is slid by a stepping motor and a cam or the like. It is possible to adjust by However, since the imaging lens 316 described in detail in this embodiment is stationary with respect to the apparatus main body, it is most effective to adjust the inclination thereof.

In this embodiment, a general image reading apparatus using one row of charge-coupled devices has been described as an example, but a color image reading apparatus using three rows of charge-coupled elements is used. This is effective for an apparatus in which the balance of the amount of light incident on the light greatly affects the color balance and the hue field of the read image, and the image forming position always needs to correspond to the central portion of the slit.

Further, Japanese Patent Application No. 1-3 filed by the applicant previously.
Even in an image reading apparatus of a type in which the same portion is divided into three colors, such as the color image reading apparatus disclosed in Japanese Patent No. 5692 and Japanese Patent Application No. 1-222535, the hue changes when the light enters. 1 It is necessary to provide a very fine slit on the upper part of the mirror, and because the adjustment is insufficient, the center of the charge-coupled device and the center of the slit do not optically coincide with each other with high precision, so that synchronization cannot be achieved during scanning. The present invention is particularly effective in such an image reading apparatus because there is a possibility that a light beam does not enter the charge coupled device.

FIG. 32 is a front sectional view of a copying machine to which the sixth invention is applied. A platen glass 60 is provided on the upper surface of the copying machine body.
0 is fixed substantially horizontally, and a partition wall 603 is provided below the platen glass 600 in parallel with the platen glass 600. A first optical unit 601 and a second optical unit 602 are provided between the platen glass 600 and the partition 603 so as to be reciprocally movable in the arrow Z direction, that is, substantially horizontally.

The first optical unit 601 has a light source 604 and a mirror 605, and the second optical unit 602 has a mirror 6.
06, 607. An opening 608 is provided in the partition wall 603, and the mirror 60 is provided above and below the opening 608.
9 and 610 are fixed.

A lens group 612 held by a frame 611 is provided between the mirrors 607 and 609. The frame body 611 is movable in the arrow Z direction by a driving unit (not shown). 33 is a partially cutaway plan view around the lens group 612 according to the first embodiment, and FIG. 34 is a right side view of FIG.

The frame body 611 has an elongated shape in a direction substantially orthogonal to the arrow Z, and a pressing piece 613 is provided on the lower surface of the end portion in the elongated direction. A guide portion 614 parallel to the arrow Z is provided on the partition wall 603. A cam plate 615 that is slidable along the guide portion 614 is provided on the partition wall 603. A pin 616 is provided on the cam plate 615, and a slide hole 617 parallel to the guide portion 614 is provided.
Is provided.

Further, the pin 618 of the partition wall 603 is inserted into the slide hole 617. Furthermore, the cam plate 615 is provided with a guide hole 619 which is inclined at a predetermined angle with respect to the arrow Z. The cam plate 615 is pulled toward the second optical unit 607 by an elastic member 620 such as a spring. Therefore, the pin 616 is in contact with the pressing piece 613.

A frame 621 is formed on the lower surface of the partition wall 603.
Is provided. The frame 621 has a pair of holding plates 622 that are slidable along the arrow W direction orthogonal to the arrow Z.
623 is attached. Slide holes 624 are provided in the holding plates 622 and 623 in the arrow W direction, and pins 625 of the frame 621 are inserted into the slide holes 624. The ends of the holding plates 622 and 623 in the vicinity of the holding plate
6 are connected by a lever 627 which rotates in a horizontal plane.

The holding plates 622 and 623 have upper plates 628 and 629, respectively, and one upper plate 629 has a pin 63.
0 is set. A hole 631 is provided in the partition wall 603, and the pin 630 is inserted into the guide hole 619 through the hole 631.

On the holding plates 622 and 623, a light emitting body 632 as a charge eliminating means is provided. In addition, the holding plates 622,
A pair of arms 634, which operate with the shaft 633 as a fulcrum, are arranged in a shape of a square V in 623.
It has been inserted into 6.

Mirrors 637 as adjusting means are provided at the opposing portions of the arms 634. Further, a mirror 638 as an exposure means is provided on the frame 621.
Is provided, and a passage 639 is provided below the mirror 638. Further, the frame 621 is provided with a pair of reflecting plates 641 facing the light emitting body 632. A pre-exposure lamp 642 is provided below the frame 621.

On the other hand, a photosensitive drum 644 as a photosensitive member is provided between the frame 621 and the bottom portion 643 of the main body of the copying machine. A primary charger 64 is provided around the photosensitive drum 644.
5, developing device 646, transfer charger 647, cleaner 648
Etc. are provided.

Further, below the developing device 646, a conveying roller 649, a conveying guide 650, a registration roller 651 and the like are provided. Further, 652 is a conveyor belt and 653 is a roller.

In the above structure, an original document (not shown) is placed on the original platen glass 600 and a copy button (not shown) is operated. Then, the first and second optical units 60
As the light sources 1 and 602 move, the light source 604 is turned on to illuminate the document. Then, the formed image light Q is reflected by the mirrors 605, 606, 607, and
After passing through the lens group 612, the mirrors 609, 610,
It is irradiated onto the surface of the photosensitive drum 644 via 638.

On the other hand, in FIG. 35, the primary charger 645 uniformly charges the surface of the photosensitive drum 644, and an electrostatic latent image is formed in a predetermined area by the irradiation of the image light Q. Further, the static elimination light R of the light emitting body 632 is irradiated by the reflection plate 641 to the outside of the irradiation area of the image light Q, and the electric charges outside the area are removed.

Then, the electrostatic latent image is developed by the developer in the developing device 646, and then transferred to the transfer paper which is transported through the transport path 650. Since the charges outside the area irradiated with the image light Q are removed in this manner, no excess developer adheres to the area. Therefore, there is no waste, no scattering, and no smearing of the transfer paper.

When the frame 611 during operation moves along the arrow Z corresponding to the copy magnification and the transfer paper size, the area where the image light Q is irradiated on the surface of the photosensitive drum 644 is l ₁ as shown in FIG. Fluctuates to ~ l ₂ .

On the other hand, when the frame body 611 moves, the movement causes the cam plate 615 to move in the same direction and the holding plates 622 and 623.
Slides in the direction of arrow W. As a result, the luminous body 632
Moves from position A to position B in FIG. That is, the irradiation area of the static elimination light R shifts from G to H. This is shown in FIG.
Corresponding to the apparent photosensitive drum position indicated by the alternate long and short dash line, it means that the area F has shifted to the area E. That is,
The image light Q is always irradiated to the outside of the irradiation areas l ₁ and l ₂ .

When the light emitter 632 is at the position A, the optical path length of the static elimination light R is bar Af ₁ , bar Af ₂ , bar Af ₃ ,
Bar Af ₄ , and the optical path length at the position B is bar Be ₁ ,
Bar Be ₂ , bar Be ₃ , and bar Be ₄ . The optical path length becomes shorter as moving from the position A to the position B.

Further, the static elimination light R for the photosensitive drum 644
The irradiation angles of LE ₁ to LE ₄ also depend on the position of the light emitter 632.
Changes from LF ₁ to LF ₄ .

However, in this embodiment, the holding plates 622, 62 are
When 3 slides in the direction of arrow W, the pin 635 is moved by the guide groove 636, so that the position of the mirror 637 is displaced steplessly, that is, the angle is changed as shown in FIG.

Therefore, the reflection efficiency is high when the light emitter 632 is at the position A, and becomes low as it moves to the position B. Therefore, regardless of the optical path length and the irradiation angle of the static elimination light R to the photosensitive drum 644, the static elimination light amount distribution on the surface of the photosensitive drum 644 can always be made uniform.

37 and 38 show a second embodiment of the sixth invention. The holding plates 622 and 623 are respectively provided with reflecting plates 655 that reflect the static elimination light of the light emitting body 632. A notch 656 is formed along the arrow W direction between the light emitting body 632 and the reflecting plate 655 at the end of the holding plates 622 and 623.
Is provided.

On the other hand, a light shielding plate 657 as an adjusting means is fixed to the frame 621 corresponding to the notch 656. Others are the same as in the first embodiment.

Also in the second embodiment, the holding plates 622 and 623 move in the arrow W direction as in the first embodiment. The static elimination light of the light-emitting body 632 is applied to the photosensitive drum 644 by a combination of the direct light which directly goes to the reflection plate 641 and the indirect light which is once reflected by the reflection plate 655 and then goes to the reflection plate 641.

In this embodiment, the amount by which the indirect light is blocked by the reflecting plate 655 is adjusted by the movement of the holding plates 622 and 623, so that the same effect as the first embodiment can be obtained.

In the second embodiment, if the light shielding plate 657 is constructed to be movable in the direction of the arrow W, the relative distance to the light emitting body 632 can be greatly changed. In addition, the light blocking plate 657
May use a semi-transmissive film or film, and
The same effect can be obtained by providing it between 32 and the reflector 641.

39 and 40 show a third embodiment. In the figure, 658 is a pair of levers, and the lever 658 is located between the holding plates 622 and 623 and the reflection plate 641. Both ends of the lever 658 are connected to the lever 627. The lever 658 is provided with a slide hole 659, and the frame 6
21 pins 660 are inserted. And the lever 65
8 is provided with a condenser type lens (adjusting means) 661. Others are the same as in the first embodiment.

In the above structure, the holding plates 622, 623
Moves as in the first embodiment. The lever 658 also moves in the direction of the arrow W in conjunction with the holding plates 622 and 623.

Then, from the light emitting body 632 to the photosensitive drum 64
As the optical path length up to the surface of No. 4 becomes longer, the lens 66
Lever 658 is actuated so that 1 enters into the optical path. As a result, the same effect as that of the first embodiment can be obtained.

The lens 661 may be a lens of a type that disperses light. In this case, the lever 658 is configured so that the lens enters the optical path when the optical path length becomes short. Further, the lens 661 may be a Fresnel lens or the like other than the spherical lens, and the same effect can be obtained.

FIG. 41 shows the fourth embodiment. The light emitter 632 is connected to the power supply unit 663 via the control unit 662. The control unit 662 is connected to a variable resistor 664 such as a slide volume.

Further, the holding plate 622 is provided with a protrusion 665, and the protrusion 665 is engaged with the lever 666 of the variable resistor 664. The adjusting means 667 is configured in this way. This adjusting means is also provided corresponding to the holding plate 623 side. No reflection plate is provided on the holding plates 622 and 623. Other configurations are the same as those in the first embodiment.

In the above structure, when the holding plates 622 and 623 move and the light emitting body 632 moves and the optical path length to the photosensitive drum 644 changes, the protrusion 665 actuates the lever 666 and the resistance value of the variable resistor 664 changes. Change.

Then, the change is sent to the control unit 662 as a signal, and the control unit 662 adjusts the voltage of the current supplied to the light emitting body 632. Therefore, when the optical path length becomes long, the light emitting body 632
If the adjusting means 667 is configured so that the voltage of the current supplied thereto is increased and the voltage of the supplied current is decreased when the optical path length is shortened, the same effect as that of the first embodiment can be obtained.

42 and 43 show the fifth embodiment.
In this embodiment, the non-irradiation area of the image light on the surface of the photosensitive drum is
It is applied when it occurs in either axial direction of the photosensitive drum. Specifically, this is a case where the transfer paper is conveyed with reference to one end in the axial direction of the photosensitive drum.

The holding plate 668 alone is formed in a long shape along the axial direction of the photosensitive drum. A light emitter 632 is provided on one end side of the holding plate 668. The holding plate 668 has a slide hole 66 inclined at a predetermined angle with respect to the arrow Z direction.
9 is provided. The frame 621 is in the slide hole 669.
The pin 670 on the side is inserted.

Further, the reflecting plate 641 is also provided only at one place corresponding to the light emitting body 632. Other configurations are the same as those in the first embodiment.

In the above structure, when the cam plate 615 moves, the holding plate 668 moves diagonally along the slide hole 669, and the light emitting body 632 also moves in the same direction. Therefore, when the optical path length is short, the light emitting body 632 moves to a position far from the reflecting plate 641 and when the optical path length is long, it moves to a position approaching the reflecting plate 641, and the optical path length is always kept constant. Therefore, the same effect as the first embodiment can be obtained.

44 and 45 show a sixth embodiment.
The holding plates 622 and 623 are provided with the light emitting bodies 632, but no reflecting plates are provided. Further, a light shielding plate 671 as an adjusting means is provided between the light emitting body 632 and the reflecting plate 641 in the frame 621.

As shown in FIG. 45, the light shielding plate 671 is provided with slits 672 having different opening widths along the arrow W direction. Others are the same as in the first embodiment.

In the above structure, the holding plates 622 and 623 move in the direction of the arrow W and the optical path length from the light emitting body 632 to the photosensitive drum changes. When the optical path length is short, the static elimination light passes through the narrow side of the slit 672, and when the optical path length is long, the static elimination light passes through the wide side of the slit 672. Therefore, the static elimination light amount distribution on the surface of the photosensitive drum is always uniform,
The same effect as the first embodiment can be obtained.

In the first to sixth embodiments, the light emitting body 632 is a single body, but a plurality of light emitting bodies 632 may be provided, and a plurality of adjusting means may be provided correspondingly.

FIG. 46 is a front sectional view of a copying machine to which the seventh invention is applied. On the upper surface of the main body of the copying machine is a platen glass 70.
0 is fixed substantially horizontally, and a partition wall 703 is provided below the platen glass 700 in parallel with the platen glass 700. A first optical unit 701 and a second optical unit 702, which are reciprocally movable in the arrow Z direction, that is, substantially horizontally, are provided between the platen glass 700 and the partition 703.

The first optical unit 701 has a light source 704 and a mirror 705, and the second optical unit 702 has a mirror 7.
06, 707. An opening 708 is provided in the partition wall 703, and the mirror 70 is provided above and below the opening 708.
9,710 are fixed.

A lens group 712 held by a frame 711 is provided between the mirrors 707 and 709. The frame body 711 is movable in the arrow Z direction by a driving unit (not shown). 47 is a partially cutaway plan view around the lens group 712, and FIG. 48 is a right side view of FIG.

The frame body 711 has an elongated shape in a direction substantially orthogonal to the arrow Z, and a pressing piece 713 is provided on the lower surface of the end portion in the elongated direction. Further, a cam plate 715 which is slidable along the arrow Z direction is provided on the partition wall 703.
A pin 716 is provided on the cam plate 715, and
Slide holes 717 and 717a are provided along the arrow Z direction.

Furthermore, the pins 718 and 718a of the partition wall 703.
Are inserted into the slide holes 717 and 717a. Furthermore, the cam plate 715 is provided with guide holes 719 and 719a inclined by a predetermined angle with respect to the arrow Z. Cam plate 715
The elastic member 720 such as a spring is used for the second optical unit 70.
It is pulled to the 7 side. Therefore, the pin 716 is in contact with the pressing piece 713.

A frame 721 is formed on the lower surface of the partition wall 703.
Is provided. The frame 721 has a pair of holding plates 722 that are slidable along the arrow W direction orthogonal to the arrow Z.
723 and another pair of holding plates 722a and 723a are attached. Holding plates 722 and 723 and holding plate 722
Slide holes 724 are provided in the a and 723a in the arrow W direction, and the pin 7 of the frame 721 is inserted into the slide holes 724.
25 is inserted. The ends of the holding plates 722, 723 and the holding plates 722a, 723a in the approaching direction are the shafts 726, 7
Lever 727 that rotates in a horizontal plane about 26a,
It is connected by 727a.

Pins 730 and 730a are provided on the holding plates 723 and 723a, respectively. The partition wall 703 is provided with a hole 731, and the pins 730 and 730a are provided with the hole 731.
Through the guide holes 719 and 719a.

At the ends of the holding plates 722 and 723 in the separating direction, light emitting bodies 732 are provided as static eliminating means. Further, the frame 721 is provided with a mirror 738 as an exposure means, and a passage 73 is provided below the mirror 738.
9 is provided.

Further, the holding plates 722a and 723a are provided on the holding plates 722a and 723a so as to correspond to the light-emitting body 732 and to serve as a pair of deflection plates.
1 is provided. A pre-exposure lamp 742 is provided below the frame 721. The cam plate 715, the holding plates 722, 722a and the holding plates 723, 723a, the levers 727, 727a, etc. are the moving means J in the present invention.
Is.

On the other hand, a photosensitive drum 744 as a photosensitive member is provided between the frame 721 and the bottom portion 743 of the copying machine main body. A primary charger 74 is provided around the photosensitive drum 744.
5, developing device 746, transfer charger 747, cleaner 748
Etc. are provided.

Below the developing device 746, there are provided a conveying roller 749, a conveying guide 750, a registration roller 751 and the like. Further, 752 is a conveyor belt, and 753 is a roller.

In the above structure, an original document (not shown) is placed on the original platen glass 700, and a copy button (not shown) is operated. Then, the first and second optical units 70
As the light sources 1 and 702 move, the light source 704 is turned on to illuminate the document. The formed image light Q is reflected by the mirrors 705, 706, 707, and
After passing through the lens group 712, the mirrors 709, 710,
It is irradiated onto the surface of the photosensitive drum 744 via 738.

On the other hand, the primary charger 745 is the photosensitive drum 74.
The surface of No. 4 is uniformly charged, and an electrostatic latent image is formed in a predetermined area by the irradiation of the image light Q. Further, the static elimination light R of the light emitting body 732 is irradiated by the reflection plate 741 to the outside of the irradiation region of the image light Q, and the charges outside the region are removed.

Then, the electrostatic latent image is developed by the developer in the developing device 746, and then transferred onto the transfer paper conveyed through the conveying path 750. Since the charges outside the area irradiated with the image light Q are removed in this manner, no excess developer adheres to the area. Therefore, there is no waste, no scattering, and no smearing of the transfer paper.

The frame 711 during operation moves along the arrow Z corresponding to the copy magnification and the transfer paper size. The area where the surface of the photosensitive drum 744 is irradiated with the image light Q is the area l ₁ shown in FIG. 49 when the lens group 712 is moved in the arrow Z ₁ direction (reduction in size) and moved in the arrow Z ₂ direction. At the time of enlargement (large size), it changes to the area l ₂ .

On the other hand, the static elimination light R emitted from the light emitting body 732 is reflected by the reflecting plate 741, and its optical path is the photosensitive drum 7.
50 is moved as shown by the chain double-dashed line in FIG. 50, and proceeds straight ahead toward the apparent position. That is, when the image area is l ₁ at the time of reduction, the light emitter 732 is at the position A and the reflection plate 741 is at the position C indicated by the solid line. Therefore, the irradiation range projected onto the photosensitive drum 744 by the light emitting body 732 is equal to the “range E” in which the straight lines facing both end surfaces of the reflecting plate 741 are extended to the apparent photosensitive drum position, and the actual photosensitive drum position When replaced with, the range becomes "range G". This range is located outside the image area l ₁ .

At the time of enlargement, the cam plate 715 makes the arrow Z ₂
When the support plates 722a and 723a slide in the direction toward each other, the support plates 722a and 723a slide toward each other.
Move away from each other.

That is, the luminous body 732 is moved to the position B by the distance L ₁
Absolutely moves, and at the same time, the reflecting plate 741 also moves a distance L ₂ to reach the position D shown by the alternate long and short dash line. In this way, the irradiation area of the static elimination light R is displaced from the apparent area E to the area F. The surface of the photosensitive drum 744 is deflected from the area G to the area H.

Thus, in this embodiment, the luminous body 73
Since the static elimination light R is polarized by moving both 2 and the reflection plate 741, the amount of movement of each of the light emitter 732 and the reflection plate 741 is reduced.

As a result, the load resistance applied to the moving means J is suppressed, the mechanical properties of the moving means J are less likely to change, and the slide holes 724, 719, 719a, 717 and the pin 71 are prevented.
Wear and damage of 8,730a, 718a, 725, etc. are unlikely to occur. Therefore, the movement accuracy of the light emitter 732 and the reflector 741 can be kept high.

Further, since the amount of movement of each of the light emitting body 732 and the reflecting plate 741 is small, the space can be omitted, and the entire apparatus can be miniaturized.

Further, the moving means J is driven by transmitting the movement of the frame body 711 to the pin 716 via the pressing piece 713. Therefore, there is no need to use a special drive source, and the structure is simple.

Furthermore, the optical path length from the light emitter to the surface of the photosensitive drum changes due to the movement of the light emitter and the like corresponding to the change of the image area to be erased on the photosensitive drum. Since the amount of movement of the luminous body can be small if
The change amount of the optical path length is also small, and the change of the light amount of the light emitter reaching the photosensitive drum can be reduced. Further, the irradiation angle when the light from the light emitting body is irradiated on the surface of the photosensitive drum changes depending on the axial direction of the photosensitive drum and the movement of the light emitting body. Since it is easy to set the position of the body at a position where the irradiation angle difference in the axial direction of the photosensitive drum is small and the irradiation angle difference when the light emitter is moved is small, the difference in the light amount distribution on the photosensitive drum and the change in the light amount are small.

As described above, there is also an effect that the amount of light necessary for removing the unnecessary charges on the photosensitive drum is easily made uniform.

FIG. 51 is a front sectional view of the second embodiment, and FIG.
FIG. 4 is a plan view showing a main part.

A light shielding plate 900 as a polarizing means is placed between the light emitting body 732 and the reflecting plate 741, and the light shielding plate 900 is a holding plate 901, 9 movable in the axial direction of the photosensitive drum 744.
It is attached to 02. A rack 903 provided on a part of the holding plates 901 and 902 meshes with the pinion 904. Each of the light shielding plates 900 has a slit 905.

The reflecting plate 741 is made larger than the range of the slit 905 formed by the movement of the light shielding plate 900, and the reflecting plate 741 is fixed to the frame 721. Reference numeral 906 denotes a pair of guide members that move according to the size of the paper supplied to the apparatus and guide the position and the guide of the paper. The guide member 906 is attached to the support plates 907 and 908, and the neutralization light R of the support 2 is applied to the outside of the irradiation area of the image light Q by the reflection plate 741 to remove the electric charges outside the area.

Then, the electrostatic latent image is developed by the developer in the developing device 746, and then transferred onto the transfer paper conveyed through the conveying path 750. Since the charges outside the area irradiated with the image light Q are removed in this manner, no excess developer adheres to the area. Therefore, there is no waste, no scattering, and no smearing of the transfer paper.

The frame 711 during operation moves along the arrow Z corresponding to the copy magnification and the transfer paper size. The area where the surface of the photosensitive drum 744 is irradiated with the image light Q is the area l ₁ shown in FIG. 49 when the lens group 712 is moved in the arrow Z ₁ direction (reduction in size) and moved in the arrow Z ₂ direction. At the time of enlargement (large size), it changes to the area l ₂ .

On the other hand, the static elimination light R emitted from the light emitting body 732 is reflected by the reflecting plate 741, and its optical path is the photosensitive drum 7.
50 is moved as shown by the chain double-dashed line in FIG. 50, and proceeds straight ahead toward the apparent position. That is, when the image area is l ₁ at the time of reduction, the light emitter 732 is at the position A and the reflection plate 741 is at the position C indicated by the solid line. Therefore, the irradiation range projected onto the photosensitive drum 744 by the light emitting body 732 is equal to the “range E” in which the straight lines facing both end surfaces of the reflecting plate 741 are extended to the apparent photosensitive drum position, and the actual photosensitive drum position When replaced with, the range becomes "range G". This range is located outside the image area l ₁ .

At the time of enlargement, the cam plate 715 is indicated by the arrow Z ₂
When the support plates 722a and 723a slide in the direction toward each other, the support plates 722a and 723a slide toward each other.
Move away from each other.

That is, the luminous body 732 is moved to the position B by the distance L ₁
Absolutely moves, and at the same time, the reflecting plate 741 also moves a distance L ₂ to reach the position D shown by the alternate long and short dash line. In this way, the irradiation area of the static elimination light R is displaced from the apparent area E to the area F. The surface of the photosensitive drum 744 is deflected from the area G to the area H.

As described above, in the present embodiment, the luminous body 73
Since the static elimination light R is polarized by moving both 2 and the reflection plate 741, the amount of movement of each of the light emitter 732 and the reflection plate 741 is reduced.

As a result, the load resistance applied to the moving means J is suppressed, the mechanical properties of the moving means J are unlikely to change, and the slide holes 724, 719, 719a, 717 and the pin 71 are not changed.
Wear and damage of 8,730a, 718a, 725, etc. are unlikely to occur. Therefore, the movement accuracy of the light emitter 732 and the reflector 741 can be kept high.

Further, since the amount of movement of each of the light emitting body 732 and the reflecting plate 741 is small, the space thereof can be omitted, and the entire apparatus can be miniaturized.

Further, the moving means J is driven by transmitting the movement of the frame 711 to the pin 716 via the pressing piece 713. Therefore, there is no need to use a special drive source, and the structure is simple.

Furthermore, the optical path length from the light emitter to the surface of the photosensitive drum changes as the light emitter and the like move in accordance with the change of the image area to be erased on the photosensitive drum. Since the amount of movement of the luminous body can be small if
The change amount of the optical path length is also small, and the change of the light amount of the light emitter reaching the photosensitive drum can be reduced. Further, the irradiation angle when the light from the light emitting body is irradiated on the surface of the photosensitive drum changes depending on the axial direction of the photosensitive drum and the movement of the light emitting body. Since it is easy to set the position of the body at a position where the irradiation angle difference in the axial direction of the photosensitive drum is small and the irradiation angle difference when the light emitter is moved is small, the difference in the light amount distribution on the photosensitive drum and the change in the light amount are small.

As described above, there is also an effect that the amount of light necessary for removing the unnecessary charges on the photosensitive drum is easily made uniform.

FIG. 51 is a front sectional view of the second embodiment, and FIG.
FIG. 4 is a plan view showing a main part.

A light shielding plate 900 as a polarizing means is placed between the light emitting body 732 and the reflecting plate 741, and the light shielding plate 900 is a holding plate 901, 9 movable in the axial direction of the photosensitive drum 744.
It is attached to 02. A rack 903 provided on a part of the holding plates 901 and 902 meshes with the pinion 904. Each of the light shielding plates 900 has a slit 905.

The reflecting plate 741 is made larger than the range of the slit 905 formed by the movement of the light shielding plate 900, and the reflecting plate 741 is fixed to the frame 721. Reference numeral 906 denotes a pair of guide members that move according to the size of the paper supplied to the apparatus and guide the position and the guide of the paper. The guide member 906 is attached to the support plates 907 and 908, and the support plates 907 and 908 have a rack 910, and the pinion 9
It moves symmetrically by 11. The movement of this guide member 906 is
The gear 912 engaged with the rack 910 of the support plates 907 and 908 and the gear 912 rotate integrally with each other, and the wire 9
13 is transmitted to the shaft 914 wound around. 9 here
Reference numerals 15 to 918 are pulleys that support the wire 913. Then, the shaft 919 and the gear 920 are rotated by the wire 913, and are transmitted via the rack 921 of the holding plate 902. Reference numeral 922 denotes a stopper that regulates the movement amount of the light shielding plate 902, and is controlled to stop the light shielding plate 902 at a predetermined position depending on the copy magnification and the size of the recording paper fed.

Others are the same as those in the first embodiment, and the holding plates 722, 723, 901 and 902, the wire 914, the pulleys 915 to 918, the gears 912 and 92 are used.
0, shafts 913, 919 and the like constitute the moving means K.

In the above structure, the light emitter 732 moves by the movement of the lens group 912, while the holding plates 901, 9
Reference numeral 02 moves by the operation of the guide member 906, and polarizes the static elimination light R. When the irradiation area of the image light Q is l ₁ at the time of reduction, the light emitter 732 is at the position A and the light shielding plate 900 is at the position M. Therefore, the light emitting body 732 causes the photosensitive drum 744 to move.
The irradiation range projected upward is equal to the “range E” formed by extending from the position A toward the reflecting plate 741 to the apparent photosensitive drum indicated by the alternate long and short dash line through the slit 905. This becomes "range G" when replaced with an actual photosensitive drum. This area is outside the image area l ₁ and irradiates an unnecessary area to remove unnecessary charges. Similarly, at the time of enlargement, the light emitter 732 moves L ₄ to the position B, and the light shielding plate 900 moves L ₅ to the position D. Photosensitive drum 74
The irradiation range on 4 is F and H, and the outside of the image area l ₂ is irradiated to remove unnecessary charges.

Also in this embodiment, the same effect as in the first embodiment can be obtained.

Since the reflector 741 is not moved,
The angle of the reflection plate 741 does not shift, and there is an effect that an accurate irradiation area can always be secured.

In the present embodiment, the light shielding plate 900 is placed in the vicinity of the reflecting plate 741, but it may be placed in the vicinity of the light emitting body 732, and further, the reflecting plate 732 and the photosensitive drum 744.
The same effect can be obtained by placing it in between.

55 and 56 show the third embodiment.
Reference numeral 950 denotes a pair of light shielding films as a deflecting means, and the light shielding film 950 is formed in a band shape. The light shielding film 950 is arranged corresponding to the holding plates 722a and 723a and the holding plates 722 and 723, respectively.

The light-shielding film 950 includes the light-shielding portion 951 and the slit 9.
52, and both ends thereof are wound around shafts 955 and 956 of separate drive sources 953 and 954 such as a motor and a mainspring. Therefore, the light shielding film 950 can be freely wound and unwound along the axial direction of the photosensitive drum 744.

Further, the drive source 954 is connected to the sensors 958 to 961 via the control circuit 957. Sensor 95
8 to 961 are arranged near the paper feed section of the copying machine body. The control circuit 957 is connected to the power supply unit 962.
Others are the same as in the first embodiment. The drive sources 954, 953, shafts 955, 956, cam plate 915, support plates 722, 722a, 723, 723a are moving means U.
Is.

In the above structure, the light emitting body 732 and the reflecting plate 741 are moved by the movement of the lens group 712 as in the first embodiment. When the sensors 958 to 961 detect the size of the transfer paper, the light shielding film 950 moves according to the size.

Therefore, in addition to the effect similar to that of the first embodiment, there is another effect that the static elimination light R can be polarized in accordance with different conditions such as the change of the copy magnification and the change of the size of the transfer paper.

Similar to the above embodiment, the same effect as above can be obtained even if the position of the light shielding film 950 is placed between the reflecting plate 741 and the photosensitive drum 744. Further, the driving method of the light shielding film 950 is also the same as in the second embodiment, that is, the sheet guide member 90 of the sheet feeding unit.
A movement of 6 may be used.

Further, in the first to third embodiments, the example in which the paper feed is based on the central reference, that is, the case where the light irradiation area to the photosensitive drum changes symmetrically, is described. When the reference position is not moved, the position of the other end of light irradiation changes twice as much as the case of the central reference, so that the use of the present invention produces the sufficient effect as described above.

[0298]

As described above, in the first aspect of the invention, even when the wire rod contacts the arcuate surface of the fixed member, the wire rod always maintains the same curvature as the winding surface of the drive member. Therefore, the pulling operation of the wire rod is surely performed, the vibration of the moving body can be prevented, and the accurate moving characteristic can be maintained.

Furthermore, since the arcuate surface is in line contact with the wire, the stress generated by the tension of the wire can be dispersed. Therefore, the durability of the wire can be improved.

Further, in the second aspect of the invention, the removal of the charges on the upper and downstream sides of the image area of the photoconductor and the removal of the charges on both sides are performed by the light flux of a single light source.

Therefore, the number of parts is small, the number of assembling steps is reduced, and the manufacturing cost can be reduced.

Further, since the second static eliminator is moved and the light source is still fixed, the wiring of the light source is not caught around or broken.

In the third invention, the moving body cannot move while the lid is moving. Therefore, the injury of the operator's hand and the positioning accuracy of the moving body are not affected.

Since the fourth aspect of the invention is configured as described above, outside light does not enter from between the lens and the horizontal portion of the light shielding frame, and the light shielding performance is improved.

In the fifth aspect of the invention, when the image light image forming position is deviated from the predetermined position, the image light is automatically returned to the predetermined position. Therefore, the working time and labor can be shortened.

According to the sixth aspect of the invention, the amount of static elimination light reaching the photoconductor can be made uniform regardless of the conditions such as the optical path length from the static elimination means to the photoconductor and the angle.

Further, in the seventh invention, since both the charge eliminating means and the polarizing means are moved to polarize the charge eliminating light, the movement amounts of the charge eliminating means and the polarizing means are reduced.

As a result, the load resistance applied to the moving means is suppressed, the mechanical properties of the moving means are less likely to change, and wear,
Hard to break. Therefore, the movement accuracy can be kept high.

Further, since the amount of movement of each of the charge eliminating means and the polarizing means is small, the space can be omitted, and the entire apparatus can be miniaturized.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view showing an optical system to which the first invention is applied.

FIG. 2 is a front sectional view of FIG.

3A is a cross-sectional view of a drive pulley, which is a first embodiment of a wire fixing mechanism used in the first invention, and FIG. 3B is a perspective view of the drive pulley of FIG.

4A is an exploded perspective view of the wire and drive pulley of FIG. 3, and FIGS. 4B and 4C are plan views and front views of a wire fixing member used in the first invention. ..

FIG. 5 is a sectional view of a drive pulley, which is a third embodiment of the wire fixing member used in the first invention.

FIG. 6 is a schematic sectional view of a copying machine to which the second invention is applied.

7 is a schematic diagram showing a main part of the copying machine of FIG.

FIG. 8 is a diagram showing another configuration example of the second static eliminator of the second invention.

FIG. 9 is a front sectional view of a copying machine to which the third invention is applied.

FIG. 10 is a perspective view showing the mechanism of the reader unit in FIG.

11 is an external perspective view of the copying machine shown in FIG.

FIG. 12 is a partially cutaway plan view showing a switch mechanism of a third invention.

13A and 13B are enlarged cross-sectional views showing the operation of the switch mechanism of FIG.

FIG. 14 is a partial perspective view showing another embodiment of the switch mechanism of the third invention.

FIG. 15 is a front sectional view of a copying machine to which the fourth invention is applied.

FIG. 16 is a diagram showing a relationship between a lens and a magnification in the embodiment of the fourth invention.

FIG. 17 is a plan view of a lens base that is an embodiment of the fourth invention.

FIG. 18 is a perspective view of a light-shielding bellows used in the fourth embodiment of the invention.

FIG. 19 is a plan view of the lens base of the fourth embodiment of the present invention, at a magnification of 200%.

FIG. 20 is a plan view of a lens base used in an embodiment of the fourth invention, at a magnification of 50%.

21A to 21C are front sectional views of an optical system to which the fourth invention is applied.

22 is an embodiment of the fourth invention, (A) is a partial cross-sectional perspective view with a light-shielding curtain attached, (B) is a side view of (A).

FIG. 23 is a side view of the entire shading device of the fourth invention.

24A is a front sectional view showing a second embodiment of the fourth invention, and FIG. 24B is a front sectional view showing a third embodiment of the light shielding device.

FIG. 25A is a front sectional view of an image reading device of a fifth invention, and FIG. 25B is a plan view of the substrate of FIG.

FIG. 26A is a side view of the reading means of the fifth invention,
FIG. 6B is a perspective view of the vicinity of the imaging lens of the fifth invention.

FIG. 27 is a schematic diagram of an optical path from a document surface of the fifth invention to a reading unit.

FIG. 28 is a perspective view showing the structure of the adjusting means of the fifth invention.

FIG. 29 is a front sectional view of FIG. 28.

FIG. 30 is a block diagram showing the main circuit configuration of the fifth invention.

31A and 31B are diagrams showing an output signal of the reading means of the fifth invention.

FIG. 32 is a front sectional view showing a schematic configuration of a copying machine to which the sixth invention is applied.

FIG. 33 is a partially cutaway plan view of the first embodiment showing the configuration around the lens group and the frame of the sixth invention.

FIG. 34 is a side view of FIG. 33.

FIG. 35 is an enlarged cross-sectional view near the frame and the photosensitive drum of FIG. 33.

FIG. 36 is a schematic diagram showing an optical path length of static elimination light of the light emitting body of FIG. 35 and an irradiation angle of the static elimination light to the photosensitive drum.

FIG. 37 is a partially cutaway plan view of the lens group and the vicinity of the adjusting means according to the second embodiment of the sixth invention.

38 is a side view of FIG. 37. FIG.

FIG. 39 is a partially cutaway plan view of the lens group and the vicinity of the adjusting means, which is a third embodiment of the sixth invention.

FIG. 40 is a side view of FIG. 39.

FIG. 41 is a partially cutaway plan view of the lens group and the vicinity of the adjusting means according to the fourth embodiment of the sixth invention.

42 is a partially cutaway plan view of the lens group and the vicinity of the adjusting means according to the fifth embodiment of the sixth invention. FIG.

43 is a side view of FIG. 42.

FIG. 44 is a partially cutaway plan view of the lens group and the vicinity of the adjusting means according to the sixth embodiment of the sixth invention.

45 is a side view of FIG. 44.

FIG. 46 is a front sectional view of a copying machine to which the first embodiment of the seventh invention is applied.

47 is a partially cutaway plan view of FIG. 46. FIG.

48 is a side view of FIG. 47. FIG.

FIG. 49 is a schematic diagram showing the relationship between the position of the light emitting body of FIG. 46 and the irradiation area of the static elimination light.

50 is an enlarged front view showing the main part of FIG. 46.

FIG. 51 is a front sectional view of a copying machine to which the second embodiment of the seventh invention is applied.

52 is a plan view showing the main parts of FIG. 51. FIG.

53 is a schematic diagram showing the relationship between the position of the light-emitting body of FIG. 51 and the irradiation area of the static elimination light.

54 is an enlarged front view showing the main part of FIG. 51. FIG.

FIG. 55 is a front sectional view of a copying machine to which the third embodiment of the seventh invention is applied.

56 is a partially cutaway plan view showing the main parts of FIG. 55. FIG.

FIG. 57 is a partially cutaway perspective view of an optical system to which the first conventional example is applied.

58A is a cross-sectional view showing the wire fixing mechanism of FIG. 57, and FIG. 58B is a perspective view of FIG.

FIG. 59 (A) is a perspective view showing an overall configuration of a second conventional example, and FIG. 59 (B) is a plan view showing a main part of (A).

FIG. 60 is a front sectional view of a copying machine of a third conventional example.

FIG. 61 is a side view of a fourth conventional example.

FIG. 62 is a perspective view of a fifth conventional example.

FIG. 63 is a front sectional view of a sixth conventional example.

FIG. 64 is a schematic diagram showing the relationship between the position of the charge eliminating means of the sixth conventional example, and the optical path length and irradiation angle of the charge eliminating light.

FIG. 65 is a front sectional view showing the structure of the seventh conventional example.

FIG. 66 is a schematic diagram showing the relationship between the position of the light emitting body of FIG. 65 and the irradiation area of the static elimination light.

[Explanation of symbols]

 21 Drive Pulley 51 Outer Surface 18 Wire 54 Fixed Claw 55 Arc Surface 79 Photosensitive Drum 81 Developer 84 Frame Erasing Reflecting Mirror 87 Blank Lamp G Image Light E Optical System 500 Device Main Body 505 First Scanner 506 Second Scanner 526 Original Placement Plate 573 lens 570 light shielding hood 572 horizontal portion 575 vertical portion 571 light shielding curtain 305 substrate (light transmitting means) 307 slit 316 image forming lens 311 reading means 322,322a stepping motor W adjusting means 632 light emitting body (static elimination means) 637 mirror (adjusting means) ) 644 Photosensitive drum (photoconductor) 741 Reflecting plate (polarizing means) Q Image light 900 Light-shielding plate (polarizing means) R Static eliminator 950 Light-shielding film (polarizing means) J, K, U Moving means

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Michiaki Endo 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc.

Claims (1)

[Claims] 1. A track member, a movable body provided movably along the track member, a circular winding surface, and a drive member for rotationally driving the winding member, and the winding member is wound around the winding surface. In a drive device having a fixing member for fixing a wire rod to a moving body and fixing a part of the wire rod to a driving member, the fixing member is set to have substantially the same curvature as the winding face, and a winding face. A drive device characterized in that an arcuate surface located substantially in the same plane is formed.