JPH09163095A - Planar projection type scanning reader - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily complete the positioning of an intermediate cover by forming the rib having the constitution that the intermediate cover can be freely slidably placed at the time of inserting the intermediate cover in the inserting direction at the bottom part within a device. SOLUTION: In a chassis 3, ribs 3a to 3c are formed by performing the bending workings to vertical upward for the peripheral edge parts of each notched part A.B. When an intermediate cover 10 is inserted into the chassis 3 in the direction of the arrow when a lower stage part is arranged on a main substrate 8, the lower stage part of the intermediate cover 10 is placed on the ribs 3c.3c formed in the inserting direction of this intermediate cover 10 and this part is freely slidably guided. The upper end parts of these ribs 3c.3c are made higher than the top parts of the electronic components mounted on the main substrate 8. If the intermediate cover is placed on this upper end part, a situation that the intermediate cover 10 interferes with these electronic components is evaded. Because the intermediate cover 10 can be slided on the ribs 3c.3c, the insertion of the intermediate cover 10 is smoothed and the mounting work becomes easy.

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. In order to read the entire original, the scanning body equipped with the light source and the mirror is reciprocally moved and scanned. The movement of the scanning body must interfere with other parts. Such a scanning body is arranged above the inside of the apparatus, and other parts such as a main board to which electronic parts are attached are arranged below. However, in order to isolate these, an intermediate cover is provided inside the apparatus. It can be attached to. However, when attaching the intermediate cover, it is important not to interfere with electronic components attached to the main board. This is because if the intermediate cover interferes with the electronic component as much as possible, it may affect the durability of the component and eventually the entire device. Since the device is required to be compact in view of the read-only device such as a facsimile, this problem becomes more important.

[0005]

The present invention uses the following means in order to solve the above problems. First of all, a projection flat plate for placing a document to be read is placed on the upper surface of the device, and an optical system scanning unit for scanning and reading in the device, a main substrate arranged below the optical scanning unit, and the like. In a flat-plate projection type scanning reading device provided with an intermediate cover for isolating the above components, a rib having a structure that allows the intermediate cover to be slidably mounted when the intermediate cover is inserted is inserted into the bottom portion of the device. A flat-plate projection type scanning reading device is formed in the same direction.

Secondly, in the above-mentioned flat-plate projection type scanning reading device, the upper ends of the ribs are located higher than the tops of the electronic components mounted on the main board.

[0007]

Embodiments of the present invention will be described with reference to the drawings. 1 is a perspective view showing the shape and mounting method of the intermediate cover 10, FIG. 2 is a plan view of a flat-plate projection type scanning reader (flatbed scanner), and FIG. 3 is XX in FIG.
6 is a plan view of the chassis 3 in a state where the optical system scanning unit is near the scanning start 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, and FIG.
FIG. 3 is a partial perspective view showing a mounting configuration of the corner member 2 with respect to the exterior cover 1.

The plane projection type scanning reading device according to the present invention, that is, the configuration 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. 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 is attached which is brought into direct contact with the document G on the projection glass 5. 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.

Next, the internal structure will be described with reference to FIG. 1, FIG. 3 to FIG. 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 bottom surface of the exterior cover 1 is exposed through the notches A and B. In the notches A,
A power supply 7 is fixedly installed on the bottom surface of the outer cover 1, and the cutout B
Inside, a main substrate 8 is fixedly mounted on the bottom surface of the outer cover 1. 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 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. 1 and 3, the intermediate cover 10 has a two-step upper and lower staircase shape, and the upper portion is placed on the upper surface of the power source 7 and the optical system fixing portion 9 as shown in FIG. As shown in FIG. 3, the lower portion is screwed to the power source 7, the main substrate 8 is covered, and the ribs 3b and 3b are screwed by screwing plate portions 3d and 3d.

When disposing the lower portion 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 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 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 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.

[0025]

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, that is, even if you do not have to prepare a copy machine beside a facsimile machine, you can read it if you put it on the projection glass as it is, and you can immediately output it to the printer of the facsimile machine. 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.

In such a flat-plate projection type scanning reading apparatus, in order to make the apparatus compact, the space between the scanning unit and other parts is narrowed, and an intermediate cover is provided to isolate the space. At the time of inserting the intermediate cover into the apparatus, the intermediate cover can be easily slid to insert and position the intermediate cover only by placing the intermediate cover on the rib.

When mounting the intermediate cover, it is particularly important to avoid interference with electronic components mounted on the main board. According to the structure of claim 2, when mounting the intermediate cover, Interference can be avoided, the cause of failure of electronic parts is reduced, and it contributes to the durability of the device.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a shape and a mounting method of an intermediate cover 10.

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.

[Explanation of reference numerals] 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 10a peep hole 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 H Harness

Claims (2)

[Claims] 1. A projection flat plate for placing a document to be read is arranged on the upper surface of the apparatus, and an optical system scanning section for scanning and reading in the apparatus, and a main substrate arranged below the scanning section. In a flat-plate projection type scanning reading device provided with an intermediate cover for isolating the above components, a rib having a structure that allows the intermediate cover to be slidably mounted when the intermediate cover is inserted is inserted into the bottom portion of the device. A flat-plate projection type scanning reading device characterized by being formed in a single direction. 2. The flat panel projection type scanning reading apparatus according to claim 1, wherein the upper ends of the ribs are located higher than the tops of the electronic components mounted on the main board. .