JP2002209037A - Original cover for flat bed type original reader - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technical means that closely contacts a pressing plate made of a hard solid board onto a transparent original platen with respect to a structure especially proper to a flat bed type original reader incorporating a light source lamp to an original cover and can correct an offset of the optical axis of the light source lamp from a read line so as to attain sharper and more uniform reading of an original. SOLUTION: Interposing a cushion spring made of a spring plate between a hinge used to pivotally mount an original cover and a reader main body or freely movably mounting an original pressing board to a cover board closely contacts the original placing board made of a solid board to the transparent original platen at a main body side. Through the structure above, fitting a claw provided to both ends of a lamp unit guide guiding a lamp unit incorporated in the original cover to both ends of a read unit guide at the main body side can prevent an offset between the read unit and the original cover side lamp unit.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a document cover structure of a flat bed type document reading apparatus widely used in an OCR (optical character reader), an image reading apparatus, a copying machine and the like. The present invention relates to a structure of a document cover particularly suitable for a flatbed type document reading apparatus which incorporates a light source lamp and enables reading of a transparent document.

[0002]

2. Description of the Related Art A flat bed type document reading apparatus is provided with a transparent platen made of a glass plate or the like on the upper surface of an apparatus housing, and a document placed on the transparent platen is moved under the transparent platen. It is read by a moving optical reading unit and has a holding plate that keeps the original in close contact with the transparent platen to prevent the original from rising from the transparent platen during reading due to folding or bending of the original. Document cover is provided. In particular, recently, in order to reduce the size of the device, a lens with a short focal length is used in the optical system of the reading unit, and even if the document rises slightly, the sharpness of the read image will be greatly reduced. It is necessary to closely adhere to the transparent platen.

For this purpose, conventionally, a document cover having a structure shown in FIG. 23 is often used. That is, hinge 4
The holding plate 7 is attached to the cover plate 2 pivotally attached to the apparatus main body 3 via a cushion material 71 made of urethane or the like, and the parallelism between the cover plate 2 and the upper surface of the main body when the document cover 1 is closed. The displacement and the difference in the thickness of the document paper are absorbed by the cushion material 71 so that the pressing plate 7 is in close contact with the entire back surface of the document 72 on the transparent document table 12.

On the other hand, a flatbed type document reading apparatus capable of reading a transparent document needs to incorporate a light source lamp in a document cover. FIGS. 24 and 25 show an example of an apparatus having such a structure. A reading unit 41 running along the lower surface of the transparent document table 12 is built in the apparatus main body 3, and the document cover 1 The lamp unit 8 which runs along the upper surface of the holding plate 7 is built in.
Inside the reading unit 41, a light source lamp 73 for illuminating a reflection original, a reflection mirror 74, an imaging lens 75, and an image sensor 76 are incorporated, and are connected to, for example, a traveling drive belt 77 as shown in FIG. The vehicle travels while being guided by the guide rod 42 and the guide rail 70 mounted inside.

On the other hand, the lamp unit 8 in the document cover
A light source lamp 78 for illuminating the transmissive document 13 is provided, and travels along the guide rail 43 provided on the cover plate 2 in accurate synchronization with the reading unit 41. In the illustrated device, the guide rail 43 on the cover plate side is provided with a rack 44 (see FIG. 16) on the back side in FIG. 25, and a pinion 45 meshing with the rack 44 is mounted on the lamp unit 8, and the light source unit 8 Pinion 45 with built-in motor
The vehicle travels by rotating the vehicle.
As the light source lamp 78 on the original cover 1 side, in order to make the original cover 1 as thin as possible with good operability, a thin one is used, and a fluorescent tube with a diameter of several mm is often used. When the light source lamp 78 is built in the document cover, a transparent plate or a white translucent plate is used as the holding plate 7. Although a transparent plate is excellent in terms of light transmittance, a white translucent plate is often used because diffused and uniform light can be obtained.

[0006]

In the document cover 1 having no built-in light source lamp shown in FIG. 23, it is reasonable to use a pressing plate having a structure in which a white plastic film is adhered to the surface of a plate-like cushioning material 71. It is a target. But Figure 2
In the document cover with the built-in light source lamp 78 shown in FIG. 4, the holding plate 7 must be made of glass or a hard plastic plate, and the deviation of the parallelism between the cover plate and the apparatus main body and the difference in the thickness of the document paper are required. The structure of absorbing with a cushion material causes problems in terms of support rigidity, reliability, durability and the like of the holding plate.

In the structure in which the lamp unit 8 for reading a transparent original is built in the original cover, there is a problem of an error in the parallelism between the lamp unit 8 and the reading unit 41 when viewed in a plan view. For example, as shown in FIG. 26 (the drawing is exaggerated), when the document cover 1 and the apparatus main body 3 are shifted, the lamp unit 8 guided by the document cover is used.
And the reading unit 41 guided by the apparatus main body, a deviation occurs. In particular, when a light source lamp with a small diameter is used and the holding plate 7 is a transparent plate, the optical axis of the light source lamp 78 At a position deviated from the illuminance, the illuminance is greatly reduced (for example, a solid line in FIG. 27), which causes a problem that uniform reading in the width direction of the document cannot be performed.

Therefore, conventionally, the illumination light is diffused by using a white translucent plate as the holding plate 7 to thereby provide the light source lamp 7.
Although the illuminance does not change due to the shift between the reading line 79 and the reading line 79, when a white translucent plate is used, FIG.
As shown by a dashed line, the illuminance is reduced as compared with the case where a transparent plate is used, so that it is necessary to use a larger diameter light source lamp to increase the amount of light or the reading speed is reduced. There was a problem.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and is made of a hard rigid plate such as glass or a hard plastic plate used for a document cover having a light source lamp for reading a transparent document. It is an object of the present invention to provide a simple structure in which a holding plate is brought into close contact with a transparent platen. This makes it possible to adhere various kinds of originals having bending habits and different thicknesses to the transparent original platen, and to adopt a means for preventing the optical axis of the light source lamp from being deviated from the reading line. Enables uniform reading.

[0010]

According to the first aspect of the present invention, a cushion spring 5 made of a spring plate is interposed between a hinge 4 for pivotally attaching the original cover 1 and the apparatus main body 3 or the original cover 1. Thus, the cover plate 2 of the document cover 1 is elastically movable and supported, and the pressing plate 7 mounted on the cover plate 2 is brought into close contact with the transparent document table 12 on the main body side.

That is, according to the first aspect of the present invention, there is provided an original cover of a flat bed type original reading apparatus which is attached to an apparatus main body 3 by a hinge 4 so as to be openable and closable and is covered on a transparent original table 12 on an upper surface of the apparatus main body. A cushion spring 5 is provided between the hinge 4 and the apparatus main body 3. The cushion spring 5 includes a flat fixing piece 9 and a floating piece 11 cut and raised with respect to the fixing piece and capable of elastically moving. The piece 9 is fixed to the apparatus main body 3, and the hinge 4 is fixed to the floating piece 11.

According to the second and third aspects of the present invention, the holding plate 7 made of a rigid plate is movably mounted on the cover plate 2 so that the holding plate 7 made of a rigid plate is attached to the transparent platen. 12 so as to be in close contact therewith.

According to the invention of claim 2, the cover plate 2 is pivotally attached to the apparatus main body 3 and the rigid plate is mounted on the inner surface of the cover plate 2 and is covered by the transparent document table 12 on the upper surface of the apparatus main body. In the document cover of the flat-bed type document reading apparatus provided with the holding plate 7, the holding plate 7
1, each engagement pair 21 is provided on the side of the holding plate 7 having an engagement protrusion 16 with a flange 14 protruding from the cover plate 2 and a counterbore 17 for receiving the flange 14. And the engaging projection 16 and the engaging hole 18 are fitted with a gap that can move relatively in the axial direction and the radial direction.

According to a third aspect of the present invention, there is provided a cover plate 2 pivotally attached to the apparatus main body 3 and a rigid plate mounted on the inner surface of the cover plate 2 and covered by the transparent document table 12 on the upper surface of the apparatus main body. A holding rail 33 for holding the side 32 of the pressing plate 7 in the first direction slidably in the side direction of the holding plate 7 on the cover plate 2; Stoppers 35 and 36 for contacting a second side 34 of the plate 7 in a direction orthogonal to the first side to prevent the plate 7 from moving in the first direction; The side 32 of the direction is inserted with a gap that can move relative to the direction perpendicular to the plane of the holding plate and in the second direction, and the stoppers 35 and 36 have a gap that allows the holding plate 7 to move in the first direction. The holding plate 7 is locked, and the stoppers 35 and 3 At least one of the is characterized in that it is detachably attached to the cover plate 2.

[0015]

According to the first aspect of the present invention, the entire document cover 1 can be elastically moved by a cushion spring 5 interposed between the hinge 4 and the apparatus main body 3. Therefore, the holding plate 7 when the document cover 1 is closed and the transparent platen 12
And the difference in the thickness of the manuscript paper placed on the transparent manuscript table is absorbed by the elastic deformation of the cushion spring 5, and the holding plate 7 is fixed to the cover plate 2 with a rigid structure. However, the holding plate 7 can be brought into close contact with the back of the original on the transparent platen.

According to the second and third aspects of the present invention, since the presser plate 7 is movably mounted on the cover plate 2, when the document cover 1 is closed, the presser plate 7 is moved by its own weight. It comes into close contact with the back of the document placed on the table 12.

In the document cover 1 having a built-in light source lamp for reading a transparent document, claws 5 are provided at both ends of a lamp unit guide 43 for guiding the built-in lamp unit 8.
3 and 53, and when the document cover 1 is closed,
3 and 53 are fitted to both ends of the reading unit guide 42 on the apparatus main body side, so that the reading unit 41 and the document cover side lamp unit 8 caused by a positional error or loose movement between the apparatus main body and the document cover. Can be prevented.

That is, a document cover of a flat bed type document reading apparatus having a built-in lamp unit 8 for reading a transparent document facing a reading unit 41 of the apparatus body with a transparent document table 12 provided on the upper surface of the apparatus body 3 interposed therebetween. In 1,
Lamp unit guide 43 for guiding the lamp unit 8
Are provided at both ends of the reading unit. The reading units provided on the apparatus main body when the document cover 1 is covered on the transparent document table 12 are provided on the both ends of the apparatus. The fitting portions 52 fitted to both ends of the guide 42 are provided.

In this case, a preferable structure is such that the claw 53 is rotatably provided around an axis parallel to the guide direction of the lamp unit guide 43, and the fitting portion 52 of the claw is fitted and detached in a tangential direction at the time of rotation. A spring 56 for urging the claw 53 in the fitting direction thereof, and a cover opening lever 58 for rotating the claw 53 in a direction in which the fitting portion 52 is disengaged when a force is applied upward. It is a structure provided with.

As another preferred structure, the claw 53 can be formed of an elastic material such as a plastic plate or a spring plate, and the fitting portion 52 can be provided with a locking function by the elasticity of the claw 53 itself. .

In the structure provided with such claws 53, an opening 54 into which these claws 53 are inserted must be provided on the upper surface of the apparatus main body. Therefore, preferably, a cover member 62 which is urged in the closing direction by a spring 63 and is pressed by a claw 53 to rotate downward is provided in the opening 54 provided on the upper surface of the apparatus main body.

The original cover according to claim 1, 2 or 3,
If the above-described structure in which the positioning claws 53 are provided is adopted, the lamp unit guide 43 provided on the document cover side can be used.
Of the reading unit guide 42 provided on the apparatus main body side.
, The lamp unit 8 and the reading unit 4 caused by the accumulation of the assembly error and the component dimensional error of the apparatus.
1 can be prevented from shifting in parallelism.

Further, in a configuration in which the pawl 53 is rotatably provided to lock the closed state of the document cover 1, the pawl 53 is rotated and unlocked by lifting the cover opening lever 58. The document cover 1 is opened. In the case where the locking function is imparted by forming the claw 53 with an elastic material, the document cover 1 is lifted upward by applying a force, whereby the elastic locking of the claw 53 is released and the document cover 1 is opened.

Further, in the case where the insertion opening 54 of the claw 53 is automatically closed by the cover member 62 when the document cover 1 is opened, it is possible to prevent dust and the like from entering the apparatus main body, and When the cover 1 is closed, the cover member 62 is automatically opened when the claws 53 enter, so that the operation of opening and closing the document cover 1 is not complicated.

[0025]

FIG. 1 to FIG. 4 show a first embodiment of the present invention. The cover plate 2 of the document cover 1 is mounted on the apparatus main body 3 via a hinge 4, and a cushion spring 5 is interposed between the hinge 4 and the main body 3. The hinge 4 has a structure in which a balance spring is built in the case 6, and the balance spring works to support the weight of the document cover 1, so that the opening / closing operation of the document cover 1 is lightened. Holding plate 7 made of glass plate, plastic plate, etc.
Is fixed to the lower surface of the cover plate 2, and a lamp unit 8 (see FIG. 24) is built in a space between the two. Since the cushion spring 5 is provided between the hinge 4 and the main body 3, the function of the balance spring is not hindered, and good opening / closing operability of the document cover is also guaranteed.

The cushion spring 5 is, as shown in FIG.
A plate-shaped fixed piece 9 and a cut-and-raised floating piece 11 are integrally formed from one spring plate. The fixed piece 9 is fixed to the apparatus main body 3, and the hinge 4 is fixed to the floating piece 11. I have. In the above-described structure, the cushion spring 5 is bent by the weight of the document cover 1, and the rigid holding plate 7 is moved to the transparent platen 1.
2 and closely adheres to the back of the document 13 placed thereon. FIG. 2 illustrates a case where the document 13 is thick, and FIG. 3 illustrates a case where the document 13 is thin. Since the amount of deflection of the cushion spring 5 changes according to the thickness of the document 13, it corresponds to documents of various thicknesses. can do.

FIGS. 5 and 6 show an embodiment of the second aspect of the present invention. In this embodiment, the cover plate 2 of the document cover is mounted on the apparatus main body 3 in a conventional hinge structure, and a plastic plate pressing plate 7 mounted on the cover plate is illustrated at four corners thereof. Engagement pair 21 shown in 6
Is held in. That is, a projection 1 having a flange 14 at the tip from the cover plate 2 side and having a groove 15 in the axial center.
6 protrudes, and the holding plate 7 is provided with a through hole 18 provided with a counterbore 17 in which the flange 14 is accommodated. The thickness D of the portion of the holding plate provided with the counterbore 17 is smaller than the length E under the neck of the projection, and the diameter F of the through hole 18 is larger than the diameter G of the lower part of the neck of the projection. A tapered portion 19 is provided on the distal end side of the flange 14 of the projection, and when the through hole 18 is pushed into the projection 16, the tapered portion 19 and the sliding groove 15 are formed.
The diameter of the flange 14 is reduced by the action of
It is inserted to the position under the neck of. The holding plate 7 thus held at the four corners by the engagement pair 21 composed of the projection 16 and the through hole 18 is brought into close contact with the back surface of the original 13 on the document table by the weight of the holding plate 7, as shown in FIG. As in the case of the structure shown in FIG. 3, floating of the document 13 of various thicknesses is prevented.

FIGS. 7 to 9 show other structural examples of the engagement pair 21 which can be adopted in place of the structure of FIG. In the structure shown in FIG. 7, a projection 22 with holes is provided on the cover plate 2, and after inserting the through hole 18 of the holding plate 7 into this projection,
A tap screw 24 with a washer 23 is screwed into the tip of the projection 22. In the structure of FIG. 8, a tapered counterbore 17 is provided in the holding plate 7, and a pin 25 having a tapered head is fitted to the cover plate 2 to form a projection. Further, the one shown in FIG. 9 is provided with a pin mounting hole 26 in the cover plate 2, a flange 27 at the distal end, and a locking portion 28 at the base end and a slit 29 for reducing the diameter of the locking portion. Pin 31
Is inserted into the pin mounting hole 26 to form a projection.

FIGS. 10 to 13 show an embodiment of the third aspect of the present invention. In this example, the side 3 of the plastic pressing plate 7 in the first direction (the left-right direction in FIG. 11)
2 and 32 are sides having a wedge-shaped cross section, and a wedge groove 33 for guiding these sides is provided on the cover plate 2. The spacing between the opposing wedge grooves 33, 33 is determined by the sides 32, 32 of the wedge section.
When the holding plate 7 is inserted between the wedge grooves 33, 33, the holding plate 7 can move in the direction perpendicular to the plate surface and in the direction orthogonal to the side 32 of the wedge cross section. The cover plate 2 is provided with stoppers 35 and 36 for locking the side 34 in the direction orthogonal to the side 32 of the pressing plate 7 in the cross section of the wedge. One of the stoppers 35 is formed integrally with the cover plate 2 as shown in FIG. 12, and the other stopper 36 is formed by a pin screwed to the cover plate 2 as shown in FIG. Before the stopper 36 is attached, the holding plate 7
3 and then the stopper 36 is screwed into the cover plate 2.

Also in the above structure, the holding plate 7 can move freely with respect to the cover plate 2, and the original 13
, The position error between the document cover 1 and the apparatus main body 3 is corrected, and it is possible to cope with documents having various thicknesses. FIG. 14 shows another structure that can be used in place of the structure of FIG. 10. A flange 37 is provided on the side of the holding plate 7 in the first direction, and the flange 37 is provided on the cover plate 2 side. A U-shaped groove 38 for guiding with a play is provided.

FIGS. 15 to 17 are views showing an example of a structure for preventing a displacement between the reading unit 41 on the apparatus main body side and the lamp unit 8 on the document cover side. FIG.
As shown in FIG. 2, a reading unit 41 is provided which runs along the lower surface of the transparent document table 12 on the top surface of the apparatus main body 3. The reading unit 41 is a guide rod 42 provided in the main body on the near side in FIG. (See FIG. 25). The document cover 1 is hinged to the main body 3 on the back side of the figure, a pressing plate 7 made of a transparent plate is provided inside, and a lamp unit 8 running along the back side of the pressing plate is provided. The lamp unit 8 runs along a guide rail 43 provided on the near side of the document cover in the drawing (see FIG. 25). The guide rail 43 on the document cover side has a rectangular cross section, and a rack 44 is provided on one surface thereof. A pinion 45 meshing with the rack is provided on the lamp unit 8.
Is mounted on the shaft. The pinion 45 is driven by gears 47, 48 and 49 by a pulse motor 46 mounted on the lamp unit 8. On the surface of the guide rail 43 opposite to the surface on which the rack is provided, slide shoes 51 provided on the ramp unit 8 are pressed at positions on both sides of the engagement position of the rack. The direction of the lamp unit 8 is defined by the two slide shoes 51.

At both ends of the guide rail 43, fitting grooves 52 are provided.
Are formed integrally with each other, and the fitting groove 52 of the claw is formed in an arc shape centered on the pivot shaft of the document cover 1 and has a groove width just fitted to the guide rod 42 of the reading unit. Have. An opening 54 is provided in a portion of the upper surface of the apparatus facing the claw 53, and both ends of the guide rod 42 are located immediately below the opening 54. When the document cover 1 is closed, as shown in FIG. 15, the guide rod 42 of the reading unit is fitted into the fitting groove 52 of the claw 53, whereby the guide rail 43 of the lamp unit 8 is positioned parallel to the guide rod 42. Is done.

FIGS. 18 and 19 show an example of a structure in which the claw 53 is opened by the cover opening lever 58. FIG.
In the structure shown in the figure, the guide rail 43 of the light source unit is used.
A shaft 55 parallel to the guide direction penetrates the shaft 55, and a claw 53 having a hook-shaped fitting groove 52 at the end is fixed to both ends of the shaft 55. The fitting groove 52 is opened to the side of the claw 53, and a winding spring 56 for urging the claw 53 toward the opening side of the fitting groove is provided. A guide oblique side 57 is formed on the distal end side of the portion where the fitting groove 52 is open. A cover opening lever 58 is formed integrally with one of the claws 53 and extends toward the side of the document cover.

18 and 19, when the document cover 1 is closed, the pawl 53 penetrates the opening 54 shown in FIG. 17, and the guide oblique side 57 at the tip comes into contact with the guide rod 42 of the reading unit, and the pawl 53 After slightly swinging rightward in FIG. 18, the guide rod 42 is fitted into the fitting groove 52. In this state, the guide rod 42 and the fitting groove 52 are fitted by the urging force of the winding spring 56, and in this state, the direction of the guide rail 43 is restricted by the guide rod 42,
The closed state of the document cover 1 is locked. When the cover release lever 58 is lifted in this locked state, the claw 53
8, the guide rod 42 and the claw 53 are disengaged from each other, and the document cover 1 is released by the pushing force acting on the lever 58.

FIGS. 20 and 21 show an example in which the claw 53 is formed of an elastic material to provide a locking function. In the structure shown in the figure, the tip of the fitting groove 52 of the claw 53 provided in the same manner as in FIG. 15 is squeezed to make this claw 53 elastic. In this structure, when the document cover is closed, the guide rod 42 on the main body side is fitted into the fitting groove 52 of the claw 53, and the fitting position is held by the elastic gripping force of the claw 53. This structure uses the claw 53 also as the lock mechanism of the document cover 1 as in FIGS. 18 and 19, but has a feature that the structure can be simplified.

FIG. 22 is a diagram showing an example of a cover provided in the opening 54 for inserting the nail. Opening 54 of the body shown in FIG.
A pin 61 is mounted so as to traverse the pin 61, a cover member 62 pivotally supported at one end of the pin 61 is provided, and a winding spring 63 for urging the cover member 62 upward is provided. I have. When the upper surface of the cover member 62 is at a horizontal position, a locking flange 64 provided on the edge of the opening 54 is provided.
Abut. When the document cover 1 is released, the cover member 62 is moved upward by the urging force of the winding spring 63 to close the opening 54. On the other hand, when the document cover 1 is closed, the claw 53 inserted into the opening 54 pushes the cover member 62 downward, whereby the opening 54 is opened and the claw 53 is opened.
Is inserted into the main body 3 and fitted to the guide rod 42 located immediately below the opening 54.

[0037]

According to the present invention described above, various errors that occur between the document cover and the apparatus main body and variations when the document cover is closed due to differences in the thickness of the paper are corrected, and Even if the original cover is made of a glass plate or a plastic plate, the original can be correctly adhered to the transparent platen of the main unit, and the lamp unit provided on the original cover side and the reading unit on the main unit side Deviation can be prevented.

Therefore, according to the structure of the present invention, it is possible to obtain a flat-bed type document reading apparatus capable of reading a clearer and more uniform document, and to use a light source lamp having a small diameter as a light source lamp for reading a transparent document. Even when a lamp is used, the pressing plate can be a transparent plate, and the reading speed can be improved.

[Brief description of the drawings]

FIG. 1 is a side view of an embodiment of the present invention;

FIG. 2 is a side view of the closed state.

FIG. 3 is a side view of a closed state when a document is thin.

FIG. 4 is a perspective view of a cushion spring.

FIG. 5 is a sectional view of a main part of the first embodiment of the invention according to claim 2;

FIG. 6 is a perspective view of a cover according to an embodiment of the present invention;

FIG. 7 is a sectional view of a main part according to a second embodiment of the present invention;

FIG. 8 is a sectional view of a main part according to a third embodiment of the present invention;

FIG. 9 is a sectional view of a main part according to a fourth embodiment of the present invention;

FIG. 10 is a sectional view of a main part of the first embodiment of the third invention;

FIG. 11 is a perspective view of an embodiment of the invention of claim 3;

FIG. 12 is a partial sectional view in a direction perpendicular to FIG. 10;

FIG. 13 is a partial cross-sectional view of the end opposite to FIG. 12;

FIG. 14 is a sectional view showing a main part of a second embodiment of the invention according to claim 3;

FIG. 15 is a side view showing a main part of a drive mechanism of the cover-side lamp unit.

FIG. 16 is a schematic plan view of FIG.

FIG. 17 is a schematic perspective view showing an example of a positioning structure of a cover-side lamp unit.

FIG. 18 is a side view of a rotatable claw.

FIG. 19 is a perspective view of a main part showing a rotatable claw opening mechanism.

FIG. 20 is a side view of an elastic nail.

FIG. 21 is a side view showing a state where the cover of FIG. 20 is opened;

FIG. 22 is a side view of a main part showing a cover of a claw insertion opening;

FIG. 23 is a schematic side view of a cover having a conventional structure.

FIG. 24 is a cross-sectional view of a main part of a flat bed type document reading apparatus capable of reading a transparent document;

FIG. 25 is a perspective view of the portion shown in FIG. 24;

FIG. 26 is a schematic plan view showing the displacement between the cover and the main body.

FIG. 27 is a graph showing a sensor output value with respect to a lamp light amount when a white translucent plate is used.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Document cover 2 Cover plate 3 Main body 4 Hinge 5 Cushion spring 7 Press plate 8 Lamp unit 9 Fixing piece 11 Floating piece 12 Transparent platen 13 Document 14 Flange 16 Projection 17 Counterbore hole 18 Through hole 21 Engagement pair 32 side 33 Wedge groove 34 Side 35 Stopper 36 Stopper 41 Reading unit 42 Guide rod 43 Guide rail 52 Fitting groove 53 Claw 54 Opening 58 Cover release lever 62 Cover member 63 Winding spring

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2H012 BA01 BA05 BA08 CB11 CB12 2H071 AA46 DA01 5C062 AA05 AA17 AB17 AD02 AD05 AD06 BA00 5C072 AA01 BA15 CA02 LA02 LA08

Claims (3)

[Claims] 1. A document cover of a flat bed type document reading device which is attached to a device body (3) with a hinge (4) so as to be openable and closable and is covered on a transparent document table (12) on an upper surface of the device body. A cushion spring (5) is provided between the hinge (4) and the apparatus body (3), and the cushion spring is cut and raised with respect to the flat fixed piece (9) and the floating piece that can be elastically moved. Piece (1
1), the fixing piece (9) is fixed to the device body (3),
A document cover for a flat bed type document reading device, wherein a hinge (4) is fixed to the floating piece (11). 2. A cover plate (2) pivotally attached to an apparatus main body (3) and a rigid body mounted on an inner surface of the cover plate (2) and covered by a transparent platen (12) on the upper surface of the apparatus main body. Holding plate made of plate (7)
In the document cover of the flat-bed type document reading device provided with, the pressing plate (7) is held on the cover plate (2) by a plurality of engagement pairs (21), and each engagement pair (21) An engagement projection (16) with a flange (14) protruding from the cover plate (2) and a counterbore (7) side engagement hole (17) having a counterbore (17) for accommodating the flange (14). 1
8), wherein the engaging projection (16) and the engaging hole (18) are fitted with a gap which can move relative to each other in the axial direction and the radial direction. Document cover for the device. 3. A cover plate (2) pivotally attached to the apparatus main body (3) and a rigid body mounted on the inner surface of the cover plate (2) and covered by a transparent platen (12) on the upper surface of the apparatus main body. Holding plate made of plate (7)
In a document cover of a flatbed type document reading device provided with a cover plate (2), a side (32) of a pressing plate (7) in a first direction is provided.
Holding rail (33) for slidably holding in the side direction,
The second side (3) of the presser plate (7) in the direction orthogonal to the first side
4) A stopper (35,
36), wherein the holding rail (33) and the side (32) in the first direction of the holding plate are fitted with a gap that can move relatively in a direction perpendicular to the plane of the holding plate and in the second direction, and Stopper (3
5) and (36) lock the presser plate (7) with a gap allowing the play plate (7) to move in the first direction, and
At least one of (35) and (36) is detachably attached to the cover plate (2).