JPH09163092A - Planar projection type scanning reader - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure a clear picture by intercepting the light, which doesn't irradiate a document and is directly projected to a lens, out of light from a light source. SOLUTION: A light shielding member 20 which intercepts an optical axis L2 is arranged between a light source 15a of a first scanning body 15 and a first mirror 15b or a light shielding member 21 provided with a reflection face is arranged below and near the first mirror 15a, and light emitted to an irradiation part P from the light source along the optical axis L2 is reflected to the irradiation part P.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat-plate type scanning reading device (flatbed scanner) for scanning and reading a document placed on a horizontal projection glass in a stationary state.
However, it can be applied as a read-only machine such as a facsimile, a personal computer, or a CAD.

[0002]

2. Description of the Related Art In a conventional facsimile, an operation reading is performed by conveying a document in a fixed direction. That is, the optical system in the apparatus is fixed, and the original is operated. In this case, due to the structure of the document conveying system, the document is limited to have a certain thickness or less. Therefore, conventionally, a thick manuscript such as the contents of a book, a catalog, a license, etc. is once copied, and the copy is used as the manuscript.

[0003]

Therefore, as in a general copying machine, there is provided a read-only machine in which even a thick original is placed on a glass surface for projection and the optical system scans and reads it. It is conceivable to use it by connecting it to a facsimile machine. It is also convenient for a personal computer and CAD to have such a reading device.

In a reading apparatus of this type, an original is illuminated by a light source, the illuminated portion is reflected by a mirror, and the image is finally projected on a lens and a CCD to produce an electronic signal. However, the problem here is that the light emitted from the light source goes directly to the mirror without illuminating the original, and this reflected light is projected onto the lens, which causes the image Is unclear. In addition, depending on the positional relationship of the light source with respect to the irradiation portion, a shadow may be formed on the irradiation portion, and this may be directly projected as an image.

[0005]

The present invention uses the following means in order to solve the above problems. First of all, the document to be read is placed on the projection flat plate provided on the upper surface of the device, and the scanner is equipped with a light source for illuminating the document and a mirror for image projection to scan inside the device for reading. In the flat-plate projection type scanning reading apparatus for performing the above, a light blocking member for blocking light not directly related to image irradiation is arranged near the light source.

Secondly, in the flat-plate projection type scanning / reading apparatus described above, the light source side surface of the light shielding member is used as a reflecting surface, and the reflecting surface is directed to the original irradiation portion of the light source.

Thirdly, in the flat-plate projection type scanning / reading apparatus described above, the reflecting surface of the light-shielding member is white or a mirror surface.

[0008]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a partial side sectional view showing the paths of the optical axes L1 and L2 in the optical system scanning section and the fixed section and the arrangement of the light blocking member 20, and FIG. 2 also serves as the paths of the optical axes L1 and L2 and the reflection plate. 3 is a partial side sectional view showing the arrangement of the light shielding member 21, FIG. 3 is a plan view of a flat-plate projection type scanning reader (flat bed scanner), FIG. 4 is a sectional view taken along line XX in FIG.
5 is a plan view of the chassis 3 in a state where the optical system scanning unit is near the scanning start position, FIG. 6 is a plan view of the chassis 3 in a state where the optical system scanning unit is near the scanning end position, and FIG. FIG. 8 is a partial perspective view showing a mounting configuration of the corner member 2 with respect to, and FIG. 8 is a perspective view showing a shape and a mounting method of the intermediate cover 10.

The plane projection type scanning reading device according to the present invention, that is, the structure of the exterior portion of the flatbed scanner will be described. The outer cover 1 is formed by bending a sheet metal, and a horizontal surface portion serving as a bottom portion is bent in an upward vertical shape to form a side surface portion. Both ends of the adjacent side surface portions are connected to each other by a corner member 2 which is bent by resin processing into an L-shape in plan view as shown in FIG. 4 or 7. The corner member 2 serves as a protective cover for the four corners of the exterior cover 1, and also projects a little below the bottom surface of the exterior cover 1 to have a function as a leg material of the flatbed scanner. In addition, since the exterior cover itself can form a corner with a safe protective structure by mounting the corner member 2, only bending of the sheet metal is required, and complicated processing such as using a deep drawing die is required. Since it is not necessary, it contributes to cost reduction.

A chassis 3, which is an inner cover, is arranged in the outer cover 1 as shown in FIG. 4. At the upper ends of the outer cover 1 and the chassis 3, a platen cover 4 made of a resin is horizontally provided. It is arranged. A horizontal plane-shaped projection glass 5 on which the original G is placed is fitted in the original table cover 4, and an upper end portion thereof is fixed to the original table cover 4 in the left-right direction and rotated vertically. A movable document holding cover 6 made of resin is provided. On the lower surface of the document pressing cover 6, a sponge 6a is attached which is in direct contact with the document G placed on the projection glass 5 to cushion when the document is pressed. The plan view appearance of the upper surfaces of these devices is as shown in FIG. Various operation panels and display panels are formed on a portion 4a of the document table cover 4 which is not covered by the document pressing cover 6.

Next, the internal structure will be described with reference to FIGS. Inside the outer cover 1, as described above,
A chassis 3 as shown in FIGS. 5 and 6 in plan view is arranged. Notches A and B are formed in the bottom surface of the chassis 3, and the bottom surface of the outer cover 1 is exposed through the notches A and B. In the notches A, the outer cover is formed. A power source 7 is fixed to the bottom surface of the outer cover 1 and a main substrate 8 is fixed to the bottom surface of the outer cover 1 in the notch B. The chassis 3 is provided with the optical system parts and the motor 7a, which will be described later. By doing so, if the chassis 3 is separated from the outer cover 1 when the maintenance work of the optical system parts is desired, the power source 7 Separately from the main board 8 and the like, take out the optical system components and the motor 7a,
Maintenance work can be performed.

In addition, in the chassis 3, each notch A
・ The peripheral edge of B is bent vertically upward to form rib 3a.
3b and 3c are formed. The ribs 3a, 3a formed before and after the cutout portion A function as positioning members for the power source 7, and the ribs 3b, 3b before and after the cutout portion B are provided at the upper end,
The screw plates 3d, 3d for screwing the intermediate cover 10 described later are formed. Further, since the main substrate 8 is arranged in the notch B, the ribs 3b and 3b and the ribs 3c and 3c are
It functions as a shield for radio waves emitted from the main board 8.
Further, the upper ends of the ribs 3c, 3c are higher than the tops of the electronic components mounted on the main board 8.

Screw holes 3e and 3e for fixing the optical system fixing portion 9 having the lens 9a and the CCD 9b are formed in the central portion between the notches A and B on the bottom surface of the chassis 3. The optical system fixing portion 9 is fixed to this portion. Further, in the vicinity of one side of the cutout portion A, the screw holes 3f.
f ... is provided for screwing a reduction gear connected to the motor shaft of the motor 7a, and a drive pulley 11 driven via the reduction gear is provided. Further, screw holes 3g, 3g ... Are formed near one side of the notch B on the bottom surface of the chassis 3 at a position facing the drive pulley 11 in the front-rear direction.
Screw 2 on.

Drive pulley 11 and driven pulley 12
Each has a large-diameter pulley and a small-diameter pulley half the diameter thereof supported on the same shaft. The large-diameter pulleys and the small-diameter pulleys of the drive pulley 11 and the driven pulley 12 have the same diameter, and the large-diameter pulleys are
And the drive belt 13 between the small diameter pulleys.
The drive belt 14 is wound to form a drive system for the optical system scanning unit described later. The drive belt 13 is driven to be conveyed at a speed twice that of the drive belt 14.

As described above, the power source 7 disposed on the bottom surface of the outer cover 1, the main substrate 8, the optical system fixing portion 9 disposed on the bottom surface of the chassis 3, the drive system (between the drive pulley 11 and the driven pulley 12). The belt system) is covered with the intermediate cover 10 from above except the drive system. As shown in FIGS. 4 and 8, the intermediate cover 10 has a two-step upper and lower stepped shape, and the upper portion is placed on the upper surface of the power supply 7 and the optical system fixing portion 9 as shown in FIG. As shown in FIG. 4, the main board 8 is covered with the lower portion by screwing to the power source 7 and screwed by the screw plate portions 3d and 3d of the ribs 3b and 3b. When disposing the lower part on the main board 8, when the intermediate cover 10 is inserted into the chassis 3 in the arrow direction shown in FIG. 8, the ribs 3c formed in the inserting direction of the intermediate cover 10 3c slidably guides the lower part of the intermediate cover 10 so that the intermediate cover 10 does not come into contact with various electronic components mounted on the main board 8 below the intermediate cover 10 so that a failure can be avoided. The vertical portion of the intermediate cover 10 is provided with a slit 10a to serve as a peep hole for the lens 9a of the optical system fixing portion 9.

Above the intermediate cover 10, FIG.
An optical system scanning unit as shown in FIGS. 2 and 4 to 6 is provided.
The optical system scanning unit includes a light source 15a formed by arranging LEDs (light emitting diodes) and the like in the left-right direction and one first mirror 15b so that the entire width between the left and right ends of the projection glass 5 can be irradiated. One scanning body 15 and two upper and lower second mirrors 16a
And the second scanning body 16 including the third mirror 16b are arranged in parallel in the front-rear direction. The first scanning body 15 is the drive belt 13 wound around the large-diameter pulley, and the second scanning body 16 is It is configured such that it is fixed to the drive belt 14 wound around a small-diameter pulley, and is conveyed in the front-rear direction by the conveyance drive of both belts 13 and 14.

The first scanning body 15 is arranged closer to the optical system fixing portion 9 than the second scanning body 16, and the conveying speed thereof is fixed to the drive belt 13, so that the second scanning body 1 is provided.
6 times twice. The optical axis path will be described in this connection. The light source 1 of the first scanning body 15 as indicated by the optical axis L1 in FIG.
The light emitted from 5a passes through the projection glass 5 and illuminates a part of the document G placed thereon (irradiation section P). Then, the light specularly reflected by the irradiation section P is reflected by the first mirror 15b and horizontally directed toward the second scanning body 16, and the second mirror 1
The light is reflected by 6a, is directed vertically downward, is reflected by the third mirror 16b in the horizontal direction, and reaches the lens 9a of the optical system fixing portion 9 arranged to face the third mirror 16b. In other words, it is a two-tiered optical axis path.

As described above, the second scanning body 16 has the two mirrors 16a and 16b on the upper and lower sides, and the two mirrors 16a and 16b are used to move the first scanning body 15 in the horizontal direction from the first mirror 15b. The light is reflected in the opposite direction in the horizontal direction, and in order to always display a constant image on the lens 9a, the optical axis L1 from the first mirror 15b (strictly speaking, the irradiation section P) to the lens 9a is set. The length must always be kept constant. Therefore, as the distance between the third mirror 16b and the lens 9a decreases,
On the contrary, in order to increase the distance between the second mirror 16a and the first mirror 15a by that amount, the first scanning body 15 has a transport speed twice that of the second scanning body 16.

The first scanning body 15 which projects the original G on the projection glass 5 directly scans between the front and rear ends of the projection glass 5, while the second scanning body 16 performs the first scanning. Since it is a medium that reflects the projection from the body 15 to the lens 9a and the conveyance speed is halved, it reaches the front-rear intermediate portion of the projection glass 5, that is, the front-rear intermediate portion in the exterior cover 1 (chassis 3). Just scan it. Therefore,
As described above, the intermediate cover 10 has a two-step upper and lower step shape, and the scanning space of the second scanning body 16 and the optical axis space between the lower third mirror 16b and the lens 9a are provided above the lower portion. On the other hand, on the other hand, above the upper portion, it is sufficient to secure only the scanning space of the first scanning body 15 and the optical axis between the upper first mirror 15b and the second mirror 16a. By forming the intermediate cover 10 into such a shape and disposing the intermediate cover 10 as described above, the first and second scanning bodies 15 and 1
While avoiding contact between the optical system scanning unit 6 and various components thereunder, it is possible to realize vertical downsizing of the device.

The first and second scanning bodies 15 and 16 of the optical system scanning section which is thus transported and driven must be constructed so as to be slid while maintaining a constant posture. for that reason,
Utilizing the space above the portion where the drive belts 13 and 14 are arranged, a scanning guide shaft 17 is installed between the front surface and the rear surface of the chassis 3, and a part of both the first and second scanning bodies 15 and 16 is provided. A fitting insertion hole is bored in and the guide shaft 17 for scanning is penetrated.

On the side opposite to the side where the scanning guide shaft 17 is erected, if essentially the same scanning guide shaft is erected, both the first and second scanning bodies 15 and 16 are surely kept in a fixed posture. Although it can slide, in order to make the length of the device in the left-right direction compact, such a guide shaft is not provided, and instead, a sliding shelf arranged on the side surface of the chassis 3 as shown in FIGS. 5 and 6. 1
The side end portions of both scanning bodies 15 and 16 are placed on top of 8, and slid on them.

In this way, of the slidable optical system scanning section, the first scanning body 15 is equipped with the light source 15a as described above, and the harness is led out from the main board 8 in order to control the lighting thereof. Then, it must be connected to the light source 15b. Since the first scanning body 15 moves, in order to cope with this, the individual conductors of the harness itself are made of a flexible material, but if they are extended as they are, the position of the harness cannot be determined, It interferes with the scanning unit of the optical system. This interference also affects the scanning posture of the optical system scanning unit, and thus must be avoided. Therefore, even if the scanning unit of the optical system moves, it does not interfere with the movement of the scanning unit, and it must be able to be stored compactly.

Therefore, as shown in FIGS. 5 and 6, above the intermediate cover 10, the harness H is attached to the two tubes 19.
The tubes 19 and 19 are housed in each other, and the lengths of the tubes 19 and 19 are substantially the same, that is, the tubes 19 and
Nine breaks are located. The exposed portion of the inner harness H is formed to a certain length at this break. With this configuration, the first scanning body 1
5 slides and moves, for example, to the state shown in FIG. 5 to FIG. 6, the exposed portion of the harness H between the tubes 19 and 19 is bent, and the exterior portions of the tubes 19 and 19 are as if Since the harness does not interfere with the optical system scanning unit and the like, and the harness itself is the shortest length that allows the first scanning body 15 to slide, it is compact. It has become.

When the apparatus according to the present invention is used as a read-only machine for a facsimile, a modem is mounted on the main board 8 to be connected to a telephone line, and the apparatus itself is separately connected to a facsimile. With such a configuration, on the intermediate cover 10, the optical system scanning unit including the first scanning body 15 and the second scanning body 16 slides smoothly and satisfactorily while keeping the posture constant, and the projection glass 5 is covered. The original placed on the scanner is scanned back and forth to project it on the lens 9a of the optical system fixing section 9, and the CCD 9b converts this into an electronic signal and transmits it to the line of the main board 8 to be used as the flatbed scanner. It is converted into an electronic signal that can be transmitted to an external terminal via a connected facsimile or telephone line.

In the structure of the optical system scanning section (first scanning body 15 / second scanning body 16) and optical system fixing section 9 as described above, a problem is caused by the light source 15a as shown in FIG. Some of the emitted light does not directly go to the irradiation part P but directly goes to the second mirror 16a, and this reaches the lens 9a and the CCD 9b along the path of the optical axis L2. This projection along the optical axis L2 obscures the image formed by the lens 9a via the optical axis L1.

In order to solve this problem, it is first necessary to block this optical axis L1. Therefore, as shown in FIG. 1, a light blocking member 20 that blocks the optical axis L2 is provided between the light source 15a and the first mirror 15b in a protruding manner. The light shielding member 20
Directly blocks the projection light from the light source 15a (along the optical axis L2), but immediately after that, the irradiation light from the light source 15a to the irradiation part P and the reflection from the irradiation part P to the first mirror 15b. It does not block light.

The light-shielding member 20 in FIG. 1 merely serves to block light along the optical axis L1, but the light-shielding member 21 shown in FIG. 2 also functions as a reflection plate for the irradiation portion P. There is. That is, the light blocking member 21 is arranged on the lower side of the first mirror 15b at a position that blocks only the optical axis L2 without blocking the optical axis L1. The surface that receives the light from 15a serves as a reflecting surface and serves as the irradiation unit P.
It is reflected to. The reflection surface may be a white surface and may be diffuse reflection, or may be a mirror surface and may be directly reflected. In any case, the light reflected from the reflection surface of the light shielding member 21 is applied to the irradiation part P, so that the irradiation part P erases a shadow generated by obliquely hitting the light from the light source 15a. , A clear image can be obtained.

[0028]

The present invention is configured as described above.
The following effects are obtained. That is, since the flat-plate projection type scanning / reading device is configured as in claim 1, if this is connected as a read-only machine to a facsimile or the like, the contents of a book, a catalog, or thick paper such as a license can be stored. Without copying, that is, even if the copying machine is not prepared beside the facsimile, it can be read by placing it on the projection glass as it is, and can be immediately output by the printer of the facsimile. Then, by key operation of the connected facsimile or external telephone, through the line,
It can also be sent to a desired partner terminal.

Further, in such an apparatus, by disposing the light shielding member as in claim 1, light other than the light for illuminating the original from the light source does not reach the lens during the reading process of the scanning section. The image becomes sharp.

According to the second aspect of the invention, the reflected light from the light-shielding member eliminates the shadow generated on the illuminated portion of the document by the light source, and the image becomes clearer.

According to the third aspect of the invention, the light reflected from the light-shielding member is properly reflected on the portion of the document illuminated by the light source, and the effect of the second aspect is further ensured.

[Brief description of the drawings]

FIG. 1 shows optical axes L1 and L in an optical system scanning unit and a fixed unit.
FIG. 3 is a partial side cross-sectional view showing the arrangement of the path 2 and the light blocking member 21.

FIG. 2 is a partial side cross-sectional view showing a path of optical axes L1 and L2 and an arrangement of a light blocking member 22 that also serves as a reflection plate.

FIG. 3 is a plan view of a flat-plate projection type scanning reader (flatbed scanner).

FIG. 4 is a sectional view taken along line XX in FIG.

FIG. 5 is a plan view of the chassis 3 in a state where the optical system scanning unit is near the scanning start position.

FIG. 6 is a plan view of the chassis 3 in a state where the optical system scanning unit is near the scanning end position.

FIG. 7 is a partial perspective view showing a mounting configuration of the corner member 2 with respect to the exterior cover 1.

FIG. 8 is a perspective view showing the shape and attachment method of the intermediate cover.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Exterior cover 2 Corner member 3 Chassis 3a, 3b, 3c Rib 3d Screw plate 5 Projection glass 7 Power supply 8 Main board 9 Optical system fixing part 10 Intermediate cover 11 Drive pulley 12 Driven pulley 13/14 Drive belt 15 First Scanning body 15a Light source 15b First mirror 16 Second scanning body 16a Second mirror 16b Third mirror 20 Light blocking member 21 Light blocking member

Claims (3)

[Claims] 1. An original document to be read is placed on a projection flat plate provided on the upper surface of the apparatus, and a scanning body equipped with a light source for illuminating the original document and a mirror for image projection is scanned inside the apparatus for reading. In the flat panel projection type scanning reading device, a light blocking member for blocking light not directly related to image irradiation is arranged near the light source. 2. The flat-plate projection type scanning reading apparatus according to claim 1, wherein the light source side surface of the light shielding member is a reflecting surface, and the reflecting surface is directed to a document irradiation portion of the light source. Flat-plate projection scanning reader. 3. The flat panel scanning device according to claim 2, wherein the light-shielding member has a reflecting surface which is white or a mirror surface.