JP3399599B2 - Document scanning device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a document scanning apparatus,
More specifically, the present invention relates to a document scanning device that irradiates a document placed on a document placing table with focused light to polarize and scan reflected light from the document. 2. Description of the Related Art In general, for example, a copying machine, a facsimile machine, and the like for reading an image of a document placed on a document placing table,
Or a reading scanner or the like is equipped with a document scanning device, irradiates light condensed on the document, forms an image of the reflected light on a photoelectric conversion element, and obtains image information. A lighting unit comprising a light source, a light collecting member, and a reflecting member is slidably mounted via a sliding member on a guide member provided in parallel with the surface of the document table, and the lighting unit is mounted on the guide member. The light-collecting member condenses the light from the light source onto the document while sliding it in a predetermined direction and moving at a predetermined distance from the surface of the document placed on the document table. The reflection member polarizes the light reflected from the original in the direction of the photoelectric conversion element and scans the light. FIG. 25 (hereinafter referred to as a first conventional example) is an example of this type of document scanning apparatus. The illumination unit of the first conventional example includes light condensing members 11 and 12 and mirrors. -(Reflection member) 13, a rod-shaped light source 14, a sliding member 15,
Are attached to the frames 16 and 17, and the light-collecting members 11 and 12 respectively connect the claws 11a and 12a to the side plates.
After being inserted into the hole 18a, the light condensing members 11 and 12 are fixed to the frame 16 by screwing the screw 19 through the hole 18b of the side plate 18 and screwing it into the screw hole 16a of the frame 16. Also, mirror 13
Is inserted into a positioning and fixing hole 17a provided in the frame 17 and held by a leaf spring. The light source 14 is held at both ends by a leaf spring-like electrode 20 attached to the frame 17. In addition, the sliding member 15 is
b is inserted and fixed from below on both ends. Note that 21
Is a thermostat to which the frame 17 is attached. As another conventional example, there is one shown in FIG. 26 (hereinafter referred to as a second conventional example), and the same components as those in the first conventional example shown in FIG. However, the lighting unit of the second conventional example uses a light collecting member 23 integrally formed with the light collecting members 11 and 12 of the first conventional example and a frame 23 integrally formed with the frames 16 and 17. ing. [0005] However, in the prior art 1, in recent years, the scanning accuracy of the original scanning device, such as the illumination light amount distribution in the scanning direction, has become strict. The optical members 11 and 12 are fixed to the side plate 18 and the reflecting members 13
Is fixed to the frame 17, and the frame 17 and the side plate 18 are fixed to the frame 16, so that a positional shift occurs between the respective members due to processing accuracy. Further, even in the second conventional example, the frame 23 is formed by bending the screw holes 16.
Since the reflection member 13 is fixed by forming the hole 17a together with the hole 16b, a positional deviation occurs between the respective members due to the processing accuracy of the bent portion. Further, in both the first and second conventional examples, the light condensing members 11, 12, and 22 are provided with the claws 11a, 12a in the holes of the side plate 18.
Since it is fixed to the side plate 18 only by being inserted into the 18a, it cannot be positioned. For this reason, there has been a problem that the positional relationship between the respective members cannot be made as designed, and high-accuracy scanning accuracy cannot be obtained. Accordingly, the present invention is to prevent the occurrence of positional deviation and obtain the scanning accuracy as designed by positioning and fixing the constituent members by the same member.
An object of the present invention is to provide a document scanning device that scans a document with high accuracy. In order to achieve the above object, according to the first aspect of the present invention, a position of a document placed on a document table is moved at a predetermined distance from the surface of the document. A light source for irradiating the original with light; a light source for irradiating the original with light; at least one light-condensing member for reflecting the light of the light source and condensing and irradiating the original with light; is constructed from a reflecting member for polarizing the reflected light in a predetermined direction,該照
Light unit at a predetermined distance from the surface of the original
Guide member, the lighting unit and the guide member
The lighting unit slides on the guide member.
A document scanning device comprising:
Holding the reflective member on the lighting unit for positioning
A holding portion for holding the reflecting member of the holding portion.
The sliding member is positioned and fixed in a plane . According to the first aspect of the present invention, the lighting unit including the light source, the light collecting member, and the reflecting member is provided with a holding portion for holding and positioning the reflecting member, The sliding member is positioned and fixed within the same plane of the holding portion . That
Therefore, the reflecting member of the lighting unit is
The slide member slides on the guide member via the slide member fixed in the plane.
And the relative position of the reflection member and the guide member
The relationship is fixed. Therefore, the sliding member is
The reflective member is positioned on the guide member as designed via
The reflected light from the original is reflected by
It is polarized with high precision in the direction of the element and the like. The present invention will be described below with reference to the drawings. FIGS. 1 to 8 are views showing an example in which a first reference example of a document scanning apparatus according to the present invention is applied to a digital two-color copying machine. FIG.
3, a document reading device 31 is placed on a document table 32, and a contact glass (document mounting table) 34 is placed one by one by an automatic document feeder (ADF) 33. The illumination unit 35 irradiates the document supplied above with light of a predetermined intensity to scan the light, and the mirror unit 36 enters the reflected light from the document to the image forming lens 37 so that the solid-state image sensor (for example, CCD: Charge: Couple
d Device) 38, the original image is color-separated by the solid-state imaging device 38, converted into electric signals of the respective colors, and read. The illumination unit 35 includes a rod-shaped illumination lamp (light source) 41 made of, for example, a halogen lamp, and an illumination lamp 41.
A light-collecting member 42 integrally formed with light-collecting portions 42a and 42b (only 42a is shown in FIG. 1) for reflecting light of the original and condensing the light on the original on the contact glass 34, and light reflected from the original. And a mirror (reflecting member) 43 that polarizes the light in a predetermined direction.
The mirror 43 includes mirrors 44 and 45, which reflect reflected light from the document polarized by the document 43 in the direction of the imaging lens 37 and enter the same.The illumination unit 35 and the mirror unit 36 are spaced apart from the surface of the contact glass 34 by a predetermined distance. The original is scanned by moving on a slide rail (guide member) 46 fixed in parallel. The light-collecting part 42 of the light-collecting member 42
b is disposed at a position facing the light collector 42a with the illumination lamp 41 as a center, and reflects the light of the illumination lamp 41 in an auxiliary manner and condenses it on the document. Lighting unit 35 and mirror unit 36
The motor 47 and the drive belts 48a through 48a are driven at a speed ratio of 2: 1 so that the optical path length of the reflected light from the document does not change during scanning.
The drive system is driven by 48c and reciprocates. The structure of the drive system itself is well known, so a detailed description is omitted, but when returning, it moves faster than when moving forward and decelerates when approaching the home position HP. The mirror unit 36 controls the sensor unit of the home position sensor 49, which is a controlled photointerrupter provided at a predetermined position of the apparatus main body.
When the illumination unit 35 and the mirror unit 36 reach the home position, the rotation direction of the motor 47 is changed from reverse (reverse direction) to normal ( By switching to the forward movement direction, the home position HP is returned from the overrun position. The mirror unit 36 is shown in FIG.
5 moves between the home position HP indicated by the solid line and the maximum forward movement position indicated by the virtual line in the right direction in the figure. An image of a document read by the document reading device 31 is converted into image data of each color by an image processing unit (not shown), and then exposed by a semiconductor laser to an exposure device 52a for exposing a photosensitive drum 51 to the semiconductor device. The data is output to an exposure device 52b that exposes the photosensitive drum 51 by an LED (light emitting diode) array (the image data of the second color is temporarily stored in a memory (not shown), A latent image is formed on the photosensitive drum 51 (output to the exposure device 52b at a delayed timing). The latent image on the photosensitive drum 51 by the exposure device 52a is of the first color (black).
Is developed by the developing device 53a, and the latent image on the photosensitive drum 51 by the exposing device 52b is visualized by the developing device 53b of the second color (red), and the transferred image is transferred to the transfer paper by the transfer charger 54. The image is copied when the fixing roller 55 is fixed.
It is supposed to. The transfer paper for copying the image of the original is taken out of the paper feed tray 56 by the paper feed roller 57, the leading ends thereof are aligned by the registration rollers 58, and the photosensitive drum 51 and the transfer charger 54 are aligned with the movement of the visible image. And the transferred image is transferred to the fixing roller 55 by the conveyor belt 59 to be discharged. Copying of the original image onto the transfer paper is started by inputting copy data such as the number of copies from a numeric keypad of an operation unit (not shown) and then pressing a start key.
For each sheet fed onto the contact glass 34 by the automatic document feeder 33, copying is performed for the number of copies. The illumination unit 44 of the original reading device 31
As shown in FIG. 4, the light collecting member 42 and the mirror 43 are positioned and held in the same plane on a holding portion 61a of the frame 61, and the holding portion 61a slides on a guide rail 46 of the frame 61. It is formed vertically with respect to the supporting portion 61b movably supported. In the holding portion 61a of the frame 61,
A holding hole 61d formed with a convex portion (positioning portion) 61c for abutting and positioning the reflecting surface of the mirror 43;
The light-collecting member is fitted in the notch 42c formed in
A positioning claw (positioning portion) 61e for positioning the 42;
Upper ends (positioning portions) 61f and 61g for pressing and positioning the back surfaces of the respective reflecting surfaces of the light collecting portions 42a and 42b of the light collecting member 42 with a side plate 62 having a predetermined elastic force are formed in the same plane. . The side plate 62 has a hole 62 located below the upper end portions (positioning portions) 64 and 65 in a natural state.
a and a notch 62b are formed, and after fixing the base end side of the side plate 62 to the support portion 61b, the hole 62a
And a notch 62b formed in the light-collecting member 42
By setting it at 42d, the light collecting member 42 is pressed against the upper end portions 61f and 61g by its elastic force and positioned. The side plate 62 is fixed to the support portion 61b on the base end side by inserting the hooking claw 62c of the side plate 62 into the hole 61h of the support portion 61b and abutting the protrusion 61i projecting below the support portion 61b. Position and fix. At both ends of the frame 61, holders 64 integrally formed with electrodes 63 for supplying electric power to the illumination lamps 41 of the illumination unit 44 are attached. It is designed to hold and hold.
The holder 64 is made of an insulating resin, and as shown in FIG.
64a, 64b, a pressing plate 64c, and a hooking claw 64d are formed. After the claws 64a, 64b are inserted into the insertion holes 61j and the notches 61k formed on both ends of the frame 61, the pressing is performed in the pressing hole 61m. Pressing the plate 64c so that it fits into the hook 64
d is hooked and attached to the notch 61n outside the bending press hole 61m. When the illumination lamp 43 is held by the electrode 63, the electrode 63 presses the illumination lamp 43 inward, so that the pressing plate 64c comes into contact with the notch 61n side of the pressing hole 61m to position the illumination lamp 43. On the back side of the frame 61, an electric connection is made between the power supply of the illumination lamp 41 and the electrode 63, and the supply of electric power is cut off when the temperature of the illumination lamp 41 becomes excessively high. A thermostat 66 is attached. As shown in FIG. 6, after setting a cylindrical portion (not shown) for measuring temperature in a hole 61o of a frame 61 facing the illumination lamp 41, as shown in FIG. 7, the circular arc portion 66b having the insertion hole 66a into which the conventional screw is inserted is hooked on the hook 61p of the frame 61 and is engaged with the hook 61q to be attached. The frame 61 is slidably supported by the guide rail 46 via a resin slide shoe (sliding member) 67 having a small sliding resistance.
8, 67 is inserted into an insertion hole 61r formed in the support portion 61b, and supports the frame 61 in the vicinity of a concave portion 61s formed to be concave above the back surface of the support portion 61b. I do. The shoe 67 has a conical portion 67a having a bottom surface larger than the diameter of the insertion hole 61r, a disc portion 67b having a diameter D2 larger than the diameter D1 of the concave portion 61s, a conical portion 67a and the disc portion 67.
b, a cylindrical portion 67c having a diameter larger than that of the insertion hole 61r. A slit 67d is formed in the diameter direction of the conical portion 67a and the cylindrical portion 67c. After the shoe 67 is inserted into the hole 61r, the shoe 67 has an interference fit in order to eliminate backlash in the horizontal direction (moving direction). The mirror unit 36 is slidably supported by the guide rail 46 via the shoe 67, similarly to the illumination unit 35. [0019] In this reference example, the light collector of the illumination unit 35
The mirror 42 and the mirror 43 are positioned on the upper end portions 61f and 61g and the convex portion 61c formed in the same plane of the holding portion 61a of the frame 61 without passing through a separate member or a bent portion. 43 and light collectors 42a and 42b of light collector 42
Can be positioned with high accuracy. Accordingly, the illumination unit 35 in which the mirror 43 and the light-collecting member 42 are positioned with high precision condenses and irradiates the light with high precision on the document, and the reflected light is polarized in the direction of the solid-state image sensor 38, and The scanning accuracy of the reading device 31 is improved. Further, since the mirror 43 and the light-collecting member 42 are positioned with high accuracy, variations among the lighting units 35 are reduced,
Adjustment for that purpose becomes unnecessary, and the yield is improved. Therefore, the cost of the lighting unit 35 is reduced. Further, since the light-collecting member 42 is pressed against the upper end portions 61f and 61g of the frame 61 by the elastic force of the side plate 62 and positioned, it is not necessary to screw the side plate 62, and it is only necessary to insert it as in the conventional case. It is possible to prevent backlash generated for fixing, and to prevent dropping due to the application of external force and vibration and noise at the time of movement. Therefore, the assembly cost of the lighting unit 35 is reduced and the reliability is improved. Furthermore, in the present embodiment, since a recess 61s to the support portion 61b of the frame 61, the sliding member (shoe) 15 which is formed in the same manner as the shoe 67 to the frame 16 described in the conventional example When the conical portion 15a or the cylindrical portion 15c is cut into the hole 16b by the edge of the hole 16b as shown in FIG. 9, the shavings fall between the frame 16 and the disk portion 15b and are supported on the slide rail 46. Rattling occurs,
The angle and parallelism of the light condensing members 11 and 12, the mirror 13, and the light source 14 were deviated, so that accurate scanning could not be performed and the image was adversely affected.
r, even if the conical portion 67a or the cylindrical portion 67c of the shoe 67 is cut by the edge of the insertion hole 61r, the shaving residue is reduced to the concave portion 61s.
Housed within. Therefore, the height H (shown in FIG. 8) of the shoe 67 from the support portion 61b can be made uniform, and the illumination unit 35 can be supported on the guide rail 46 with high accuracy. The scanning accuracy is improved. Also, an electrode 63 for supplying and holding power to the illumination lamp 41 of the illumination unit 35 is integrally formed with the holder 64, and a claw 64 is inserted into the insertion hole 61j and the notch 61k of the frame 61.
a, 64b is inserted and then pressed to engage the hook 64d.
Is bent and hooked on the notch 61n and attached to both ends of the frame 61, so as to attach the electrode 20 to the frame 17 described in the conventional example, as shown in FIGS. 10 and 12, an insulating resin base 74 and an insulating resin cover are provided. 75 and electrode 20
Between the projection 74a of the base 74 and the hole 20 of the electrode 20.
a, the cylinder 75a of the cover 75, the hole 20b of the electrode 20, and the base
Compared to the combination of the holes 74b of 74 and the positioning and screwing and fixing so that the screws 76 do not conduct, the electrodes 63 can be attached to the frame 61 without worrying about conduction, Further, since there is no need for screwing and the number of parts is small, the cost of the lighting unit 35 is further reduced. Further, since the holder 64 is positioned by pressing the pressing plate 64c against the pressing hole 61m of the frame 61, the position of the electrode 63 is positioned with high precision, and
41 is pinched and held with stable force. Therefore, the convex portion 74a, the hole 20a, and the hole 75a which are aligned as in the related art are used.
There is no occurrence of unevenness of the holding power of the illumination lamp 41 due to the deterioration of the positional accuracy due to the accumulation of the processing / assembly errors of the illumination lamp 41 and the occurrence of bending or poor contact of the illumination lamp 41. Further, after setting the cylindrical portion on the back side of the frame 61 with the thermostat 66 for preventing the temperature of the illumination lamp 41 from excessively rising, the circular arc portion 66b is rotated only by rotating the frame portion.
As shown in FIGS. 11 and 12, a screw 77 is inserted into the insertion hole 21a to attach the thermostat 21 to the frame 17 described in the conventional example. Screw hole
There is no need to fix the arc 21a by screwing it to 17b,
Since there is no need for screwing and the number of parts is small,
The cost of the lighting unit 35 is further reduced. Further, the thermostat 66 is prevented from rotating in the returning direction by the claw 61q, and is prevented from falling off by the catching claw 61p. Reference numeral 78 in FIG. 12 denotes a power supply cable for electrically connecting the thermostat 21 and the electrode 20 and supplying power to the illumination lamp 14. [0025] In the present embodiment, the condensing portion 42a, 42b and has been described using a condensing member 42 integrally formed with the condenser section
It goes without saying that similar effects can be obtained by applying the light collecting members 42a and 42b separately to each other.
As another aspect of the slide shoe 67 of the present embodiment, as shown in FIG. 13, the disk portion 87b of the slide shoe 87
The support portion 61 of the frame 61 is attached to the outer peripheral surface of the cylindrical portion 87c adjacent to
A groove 87d having a diameter smaller than the thickness of the plate
The shavings of the shoe 67 due to the edge of the insertion hole 61r
d, the same effect can be obtained, and since there is no need to perform processing such as pressing to form the concave portion 61s in the frame 61, the accuracy of the frame 61 is increased and the cost is reduced. You. As shown in FIG. 14, a slit 81a extending from the insertion hole 61r to the outside is formed in the supporting portion 61b of the frame 61 in a predetermined direction, and the shoe 67 is inserted from a direction parallel to the moving plane of the lighting unit 35. As shown in FIG. 15, the same function and effect can be obtained by collecting the shavings generated when inserting the shoe 67 between the cylindrical portion 67c of the shoe 67 and the insertion hole 61r. ,
Since the shavings fill the gap between the insertion hole 61r of the frame 61 and the cylindrical portion 67c of the shoe 67, play in an in-plane direction parallel to the slide rail 46 can be more reliably eliminated. Further, the hook 61p of the frame 61 of the present embodiment.
As another embodiment, as shown in FIG. 16 and FIG. 17, a pinching claw having a convex portion 81b on the back side of the frame 61 is provided.
81c is formed and thermostat 66 is inserted into hole 61o of frame 61.
After the cylindrical portion is set therein, by rotating in the direction of the arrow in the drawing, the convex portion 81b is engaged with the insertion hole 66a of the arc portion 66b, and the same effect is obtained by the pinching claw 81c being pinched. be able to. Also, as shown in FIGS. 18 to 20, instead of the thermostat 66, an electrical connection is made between the power supply of the illumination lamp 41 and the electrode 63 by a thermal fuse 86 and a connector 89 for facilitating replacement of the thermal fuse 86. Bends 86a and 89a for inserting and holding the thermal fuse 86 and the connector 89 in the frame 61, and when the temperature of the illumination lamp 41 becomes excessively high, the thermal fuse 86 is blown. The same operation and effect can be obtained even if the supply of power is cut off. Next, FIG. 21 is a diagram showing an example in which the second reference example of the document scanning apparatus according to the present invention is applied to a digital two-color copying machine. In the present embodiment, the same configuration as described above Reference Example explanation thereof will be denoted by the same reference numerals. In FIG. 21, reference numeral 91a denotes a holding unit, and the holding unit 91a is a frame 61.
The mirror 43 is formed vertically with respect to the
A corner 91b (positioning portion) for positioning and holding the illumination lamp 41 in the same plane as the holding hole 61d for positioning and holding the lamp is formed. After fixing the base end side of the side plate 92 having a predetermined elastic force to the supporting portion 61b of the frame 61,
The oblique portion 92a formed on the side plate 92 is pulled up by the elastic force and is pressed against the illumination lamp 41 to be positioned. In this reference example, the lighting unit 35
The illumination lamp 41 and the mirror 43 are positioned at the corners 91b and the projections 61c formed in the same plane of the holding portion 91a of the frame 61 without passing through another member or a bent portion. The same operation and effect as those of the above-described reference example can be obtained. Next, FIGS. 22 to 24 are views showing an example of applying the first embodiment of the document scanning apparatus according to the invention of claim 1, wherein the digital two-color copying machine. In this embodiment, the same components as those of the above-described reference example are denoted by the same reference numerals, and the description thereof will be omitted. In the figure, reference numeral 107 denotes a slide shoe, and a slit 107a is formed in a radial direction of the shoe 107. The shoe 107 is provided with a lower end of a holding portion 101a having a holding hole 61d for positioning and holding the mirror 43. The lighting unit 35 is pressed against the bottom of the slit 107a by its own weight, and slidably supports the lighting unit 35 on the slide rail 46. A claw 107b is formed inside the slit 107a of the shoe 107.
It is designed to engage with an engagement hole 101b formed at the lower end of 1a. That is, the shoe 107 is attached to the holding portion 101a.
Is held in the same plane as the holding hole 61d formed in the hole. In this embodiment, the mirror 41 of the illumination unit 35
In addition, since the shoe 107 is positioned in the same plane of the holding portion 101a of the frame 61 without passing through a separate member or a bent portion, the same operation and effect as in the above-described embodiment can be obtained. In the above-described embodiment, together with the reflecting member, one of the light collecting member, the light source, and the sliding member is positioned and held in the same plane of the holding unit.
It goes without saying that the scanning accuracy of the document scanning device can be further improved by positioning and holding at least two of the reflecting member, the light collecting member, the light source, and the sliding member. According to the present invention, since the sliding member for positioning and fixing that supports the lighting unit slidably in reflection member together with the same in the same plane of the holding portion, with respect to the reflection member By preventing misalignment, it is possible to position the reflecting member and the members constituting other lighting units as designed,
Further, the reflecting member can be supported on the guide member as designed. Therefore, it is possible to condense and irradiate the light to the document with high accuracy by the illumination unit, and to polarize the reflected light in the direction of, for example, the photoelectric conversion element. As a result, the scanning accuracy as designed can be obtained, and the original can be scanned with high accuracy. Further, the number of screwing operations is reduced, so that the assembling cost is reduced, and a high-accuracy scanning accuracy can be obtained only by assembling. Yield also improves. Therefore, a low-cost document scanning device can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view showing an overall configuration of an example in which a first reference example of a document scanning apparatus according to the present invention is applied to a digital two-color copying machine. FIG. 2 is an internal configuration diagram showing a main part thereof. FIG. 3 is a perspective view showing a main part thereof. FIG. 4 is an exploded perspective view showing a main part thereof. FIG. 5 is an exploded perspective view showing different main parts. FIG. 6 is an exploded perspective view showing different main parts. FIG. 7 is a partially enlarged cross-sectional view showing a main part shown in FIG. 6 when attached. FIG. 8 is a partial cross-sectional view showing a different main part. FIG. 9 is an explanatory diagram illustrating an operation of a main part illustrated in FIG. 8; FIG. 10 is an explanatory diagram for explaining an operation of a main part shown in FIG. 5; FIG. 11 is an explanatory diagram illustrating an operation of a main part illustrated in FIG. 6; FIG. 12 is an explanatory diagram for explaining an operation of a main part shown in FIGS. 5 and 6; FIG. 13 is a front view showing another embodiment of the members constituting the first reference example. FIG. 14 is a perspective view illustrating another embodiment different from FIG. FIG. 15 is a partial cross-sectional view for explaining the operation of the other embodiment shown in FIG. FIG. 16 is a perspective view showing another embodiment of the member different from that of FIG. 13; FIG. 17 is a partially enlarged cross-sectional view for explaining the operation of the other embodiment shown in FIG. 16; FIG. 18 is a perspective view showing another embodiment of the member different from that of FIG. 13; FIG. 19 is an exploded perspective view illustrating another embodiment shown in FIG. 18. FIG. 20 is an exploded perspective view for explaining members different from FIG. 19 in another embodiment shown in FIG. 18; FIG. 21 is a front view showing a main part of an example in which a second reference example of the document scanning apparatus according to the present invention is applied to a digital two-color copying machine. 22 is a side view showing a main part of an example of applying the first embodiment of the document scanning apparatus according to the invention of claim 1, wherein the digital two-color copying machine. FIG. 23 is an enlarged view showing a main part thereof. FIG. 24 is an exploded front view of the main part. FIG. 25 is an exploded perspective view showing a conventional example of a document scanning device. FIG. 26 is an exploded perspective view showing a main part of another conventional example. [Description of Signs] 31 Document Scanner 33 Automatic Document Feeder 34 Contact Glass (Document Placement Table) 35 Illumination Unit 36 Mirror Unit 38 Solid-State Image Sensor 41 Illumination Lamp (Light Source) 42 Light Collector 43 Mirror (Reflective Member) 46 Slide Rail (guide member) 61 Frame 61a, 91a, 101a Holding part 61b Support part 61c Convex part (positioning part) 61e Claw (positioning part) 61f, 61g Upper end part (positioning part) 62, 92 Side plate 67, 87, 107 Slide shoe (Sliding member) 91b corner (positioning part)

────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Takuji Takahashi 1-3-6 Nakamagome, Ota-ku, Tokyo Inside Ricoh Co., Ltd. (72) Inventor Hiroshi Iwabuchi 86, Kita-Sanda, Sanuma, Sako-cho, Tome-gun, Miyagi Prefecture Ricoh Co., Ltd. (72) Inventor Yasuhiro Yamada 86, Sanuma character, Kita-santa, Sako-cho, Tome-gun, Miyagi Prefecture Inside Sako Ricoh Co., Ltd. (56) References Field (Int. Cl. ⁷ , DB name) G03B 27/00-27/80

Claims (1)

(57) [Claim 1] An illumination unit that moves at a predetermined distance from the surface of a document placed on a document table and irradiates the document with light, A light source for irradiating the original, at least one light-condensing member for reflecting the light of the light source and condensing and irradiating the original, and a reflection for polarizing the light condensed and reflected on the original in a predetermined direction; It was composed of a member, and a predetermined interval of the lighting unit relative to the surface of the document
Guide member for guiding to the position, lighting unit and guide section
The lighting unit is interposed between the guide member and the lighting unit.
And a sliding member movably supported.
In the lighting unit, a reflection member is held and positioned.
A holding portion is provided, and the sliding member is held in the same plane for holding the reflecting member of the holding portion.
A document scanning device characterized in that members are positioned and fixed.
Place.