JPH09163041A - Planar projection type scanning reader - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the electrostatic charging on the surface of glass, to eliminate the attraction of dust and to reduce the stain of an image by making glass for projection conductive glass and grounding the glass with a chassis. SOLUTION: Glass for projection is the conductive one whose surface is coated with a conductive film 5a. Between the glass 5 for projection of this conductive glass and the supporting plate part 3h of a chassis 3 on which this glass is placed, conductive buffer material 20 such as sponge, etc., is interposed. Therefore, the electrostatic charging of the glass 5 for projection is grounded to the chassis 3 via the conductive film 5a and the conductive buffer material 20, the electrostatic charging in this glass 5 for projection is eliminated and dust is not attracted. As a result, if a planar projection type scanning reader is connected as a reading exclusive machine to a facsimile equipment, etc., the reading of the contents of a book, a catalogue or thick paper sheets such as a license, can be performed having only to place them on the glass 5 for projection as they are without copying them once.

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 the construction of the reading device of this type, the glass surface for placing the document is particularly apt to attract dust,
There is a problem that the dust is read in the reading scan and appears as a stain on the image. It is desirable to be able to prevent this with a simple configuration.

[0005]

The present invention uses the following means in order to solve the above problems. First of all, in a device configuration in which a projection flat plate for placing a document to be read is placed on the upper surface of the device and the scanning is performed by scanning the optical system scanning unit in the device, the projection flat plate is used. Is a conductive glass and is grounded to a chassis on which the flat glass is mounted.

Secondly, in the flat-plate projection type scanning reader, the conductive glass is glass coated with a conductive film.

Thirdly, in the flat-plate projection type scanning / reading apparatus described above, a conductive cushioning material is provided between the conductive glass and the supporting portion of the chassis.

[0008]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a side view showing a configuration and a mounting method of a projection glass 5 which is a conductive glass, FIG. 2 is a plan view of a flat-plate projection type scanning reading device (flat bed scanner),
3 is a cross-sectional view taken along line XX in FIG. 2, FIG. 4 is a plan view of the chassis 3 in a state where the optical system scanning unit is near the scanning start end position, and FIG.
6 is a plan view of the chassis 3 in a state in which the optical system scanning unit is near the scanning end position, FIG. 6 is a partial perspective view showing a mounting configuration of the corner member 2 to the exterior cover 1, and FIG.
It is a perspective view which shows the shape of 0, and an attachment method.

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. As shown in FIG. 3 or 6, both ends of the adjacent side surface portions are connected by a corner member 2 which is bent by resin processing into an L shape in plan view. 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. 3, and at the upper ends of the outer cover 1 and the chassis 3, a platen cover 4 made of 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 cushioning sponge 6a that is in direct contact with the document G on the projection glass 5 is attached. The projection glass 5 is placed on the support plate portions 3h, 3h, ... Formed by bending the upper end of the chassis 3 shown in FIG. 3 or 4. 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 original document cover 4 which is not covered by the original pressing cover 6.

As shown in FIG. 1, the projection glass 5 is a conductive glass whose surface is coated with a conductive film 5a. As shown in FIG. 1, a conductive cushioning material 20 such as a sponge is provided between the projection glass 5 of conductive glass and the support plate portion 3h of the chassis 3 on which the projection glass 5 is mounted. Therefore,
The charging of the projection glass 5 is grounded to the chassis 3 through the conductive film 5a and the conductive cushioning material 20, the charging of the projection glass 5 is erased, and dust is not adsorbed.

Next, the internal structure will be described with reference to FIGS. 3 to 5 and 7. Inside the exterior cover 1, as described above, the chassis 3 as shown in FIGS. 4 and 5 in plan view is arranged. Notches A and B are formed in the bottom surface of the chassis 3, and the exterior cover 1 is passed through the notches A and B.
The bottom surface of the outer cover 1 is exposed, and the power source 7 is fixed to the bottom surface of the outer cover 1 in the cutout portion A, and the main substrate 8 is fixed to the bottom surface of the outer cover 1 in the cutout portion B.
Is fixed. Since the optical system parts and the motor 7a, which will be described later, are arranged in the chassis 3, by doing so, if the chassis 3 is separated from the exterior cover 1 when the maintenance work of the optical system parts is desired, the power source 7 It is possible to take out the optical system parts, the motor 7a and the like separately from the main board 8 and the like, and perform maintenance work.

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 harmful radio waves emitted from 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 to screw a reduction gear connected to the motor shaft of the motor 7a, and a drive pulley 11 driven via the reduction gear is provided. Furthermore, at a position facing the drive pulley 11 in the front-rear direction, in the vicinity of one side of the notch B on the bottom surface of the chassis 3,
Screw holes 3g, 3g, ... Are provided to screw the driven pulley 12 into place.

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 optical system fixing portion 9 and the driving system (driving pulley 11, which are arranged on the bottom surface of the outer cover 1 and the power source 7, the main board 8 and the chassis 3 are arranged.
Of the belt system between the driven pulleys 12), except for the drive system, the intermediate cover 10 covers from above. As shown in FIGS. 3 and 7, the intermediate cover 10 has a two-step upper and lower staircase shape, and the upper step portion is placed on the upper surface of the power source 7 and the optical system fixing portion 9 as shown in FIG. Screwed to the power supply 7,
As shown in FIG. 3, the lower portion covers the main substrate 8 and is screwed by the screw stop plate portions 3d and 3d of the ribs 3b and 3b.

When the lower part is arranged on the main board 8, the intermediate cover 10 is attached to the chassis 3 in the direction of the arrow shown in FIG.
When inserted inside, the lower portion of the intermediate cover 10 is placed on the ribs 3c, 3c formed in the insertion direction of the intermediate cover 10 and slidably guides it. The rib 3c
The upper end of 3c is located higher than the tops of the electronic components attached to the main board 8. Therefore, if placed on this, the intermediate cover 10 will not interfere with these electronic components. It is avoided. Also, the ribs 3c and 3
Since it can slide on c, the intermediate cover 10 can be inserted smoothly and the mounting work is facilitated. Thus, when the intermediate cover 10 is positioned at the predetermined position, it is screwed as described above. In addition, in the vertical portion of the intermediate cover 10,
A slit 10a is provided as a peep hole for the lens 9a of the optical system fixing portion 9.

Above the intermediate cover 10, an optical system scanning section as shown in FIGS. 3 to 5 is arranged. 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. The one scanning body 15 and the second scanning body 16 having the two upper and lower second mirrors 16a and 16b are arranged in parallel in the front-rear direction, and the first scanning body 15 is arranged on the large-diameter pulley. The second scanning body 16 is fixed to the drive belt 13 wound around the small-diameter pulley on the drive belt 13 wound around the two drive belts 13 and 14.
The transport drive is used to transport each in the front-back direction.

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. Like the optical axis L shown in FIG. 3, the light source 1 of the first scanning body 15
The light emitted from 5a passes through the projection glass 5 and illuminates a part of the original document G placed thereon. Then, the specularly reflected light is reflected by the first mirror 15b, horizontally directed to the second scanning body 16, reflected by the second mirror 16a, and directed vertically downward, and horizontally by the third mirror 16b. Lens 9a of the optical system fixing portion 9 which is reflected in the direction and is arranged to face the third mirror 16b.
Reach 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, from the first mirror 15b (strictly, the irradiation position of the projection glass 5 by the light source 15a) to the lens 9a. The length of the optical axis L up to 9a must always be kept constant. Therefore, the third mirror 16b and the lens 9a
In order to increase the distance between the second mirror 16a and the first mirror 15a by decreasing the distance between the first and second mirrors 16a and 15a, the first scanning body 15 is twice as wide as the second scanning body 16. The transport speed of

The first scanning body 15 which directly projects the original G on the projection glass 5 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 are driven and conveyed as described above, must be configured to slide while maintaining a fixed 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 erection side of the scanning guide shaft 17, if essentially the same scanning guide shaft is erected, both the first and second scanning bodies 15 and 16 can be surely placed in a constant posture. Although it is slidable, such guide shafts are not provided on both sides in order to make the lateral length of the device compact and to reduce the cost. Instead, as shown in FIG. 4 and FIG. The side end portions of both scanning bodies 15 and 16 are placed on the sliding shelf 18 arranged on the side plate portion 3 and slid on this.

Of the optical system scanning unit which can be slid back and forth as described above, the first scanning body 15 has the light source 15a as described above.
The main board 8 is provided to control the lighting of the
The harness must be pulled out further and 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. 4 and 5, above the intermediate cover 10, the harness H is connected 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, from the state shown in FIG. 4 to the state shown in FIG. 5, 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 composed of the first scanning body 15 and the second scanning body 16 slides smoothly and satisfactorily while keeping the posture constant, so that the document placed on the projection glass 5 is scanned. Scanning back and forth, projecting this on the lens 9a of the optical system fixing section 9, the CCD 9b converts this into an electronic signal and transmits it to the line of the main board 8, and a facsimile or telephone line connected to this flatbed scanner. It is converted into an electronic signal that can be transmitted to an external terminal via.

[0027]

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. Even if you do not make a copy once, that is, even if you do not have to prepare a copy machine by the side of the facsimile, you can read it by placing it on the projection glass as it is, and immediately output it to the printer of the facsimile. It is also possible to transmit to a desired partner terminal via a line by operating a key of a connected facsimile or an external telephone.

With such an apparatus configuration, the projection glass for placing the original is conductive glass as described in claim 1,
In addition, by grounding the chassis, the glass surface is not charged, and therefore dust is not adsorbed, so that image stains can be reduced.

Further, as in the case of the structure described in claim 2, in the conductive glass, the glass material itself is made to be conductive,
It can be constructed at a low cost by means of coating a conductive film.

Further, according to the third aspect of the invention, the conductive cushioning material has a cushioning effect, and also has a function of grounding the conductive glass to the chassis in order to exhibit the effect of eliminating the charge. is there.

[Brief description of the drawings]

FIG. 1 is a side view showing a configuration and a mounting method of a projection glass 5 which is a conductive glass.

FIG. 2 is a plan view of a flat-plate projection type scanning reader (flatbed scanner).

FIG. 3 is a sectional view taken along line XX in FIG.

FIG. 4 is a plan view of the chassis 3 in a state where an optical system scanning unit is near a scanning start end position.

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

FIG. 6 is a partial perspective view showing a mounting configuration of the corner member 2 with respect to the exterior cover 1.

FIG. 7 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 stop plate part 3h Support plate part 4 Manuscript table cover 5 Projection glass 5a Conductive film 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 17 Scanning Guide Shaft 18 Sliding Shelf 19 Tube 20 Conductive Buffer H Harness

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification number Agency reference number FI Technical display location H04N 1/107

Claims (3)

[Claims] 1. A flat-plate projection type scanning reading device in which a projection flat plate for placing a document to be read is arranged on the upper surface of the device, and scanning is performed by scanning an optical system scanning section in the device. A flat-plate projection type scanning reading device, characterized in that the projection flat plate is made of conductive glass and is grounded to a chassis on which it is mounted. 2. The flat panel projection type scanning reader according to claim 1, wherein the conductive glass is a glass coated with a conductive film. 3. The plate projection type scanning reading device according to claim 1, wherein a conductive cushioning material is provided between the conductive glass and a supporting portion of the chassis. apparatus.