JPH09266522A - Document mount device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a document mount device which prevents the read precision of an image reader from decreasing as much as possible by making easy insertion into the image reader and also making the clearance between the image reader and document mount device as small as possible. SOLUTION: In a document mount device 3 which is so constituted as to mount a document so that the image reader reads image data out and has a rack 46 engaging with a 45 arranged on the image reader and moves in the image reader according to the rotation of the pinion 45, the rack 46 is so formed that only the starting tooth 91 engaging the pinion 45 is less in whole depth than any other tooth 92.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a document loading device used in an image reading device for reading image data of a document such as photographic film or microfilm, and more specifically,
The present invention relates to a document mounting apparatus that has a rack that meshes with a pinion arranged in an image reading apparatus and that moves within the image apparatus according to the rotation of the pinion.

[0002]

2. Description of the Related Art In recent years, research and development of an image reading apparatus for reading and storing image data of photographic film and processing the image has been actively conducted. As a document loading device used in such an image reading device,
The applicant has a rack configured to be able to mount a document for causing the image reading device to read image data, has a rack that meshes with a pinion arranged in the image reading device, and Have already developed something that is configured to be mobile. In this document loading device, when the document loading device is inserted into the insertion port of the image reading device, first, the tips of the first teeth of the rack are fitted into the tooth spaces of the pinion of the image reading device, and then the document loading device is inserted. By pushing in,
As a result of the mesh side tooth surface of the rack pressing the mesh side tooth surface of the pinion, the document mounting apparatus is guided into the image reading apparatus while rotating the pinion. Next, when the user specifies the reading of the image data, the image reading device rotates the pinion by driving the motor to move the document mounting device and at the same time, the image data of the document mounted on the document mounting device. Is reading.

[0003]

However, the original mounting apparatus developed by the applicant has the following improvements. That is, when the document loading device is inserted into the insertion port of the image reading device, as shown in FIG. 19, the edge of the cutting edge surface of the first tooth 113 of the rack 112 of the document loading device that meshes with the pinion 111 of the image reading device. Part 114 is tooth 1 of pinion 111
There is a case where the blade surface 116 of the blade 15 comes into contact with the timing surface at a good timing. In such a case, even if the document loading device is pushed in, the pressing may act only toward the central axis of the pinion 111, and the pinion 111 may not rotate. For this reason, the user must try inserting the document again, especially when the document loading device is repeatedly inserted into the image reading device in order to cause the image reading device to read many documents. There is a problem that phenomena may occur and it is difficult to use.

As a solution in this case, the pinion 11
It is also conceivable to form a clearance between the rack 1 and the rack 112 so that the rack 1 and the rack 112 surely mesh with each other. However, when such a method is adopted, when the image reading apparatus reads the image data while moving the document mounting apparatus, the movement accuracy and the positioning accuracy are deteriorated due to the play caused by the escape, resulting in a decrease in the image data. There is a new problem that the reading accuracy of the image is reduced. Also, when the escape is formed by a structure that moves either the pinion or the rack,
The structure for that purpose becomes complicated, and there arises a problem that the cost of the device increases.

The present invention has been made to solve the above problems, and can be easily inserted into an image reading device.
Moreover, it is a main object of the present invention to provide an original document mounting device which enables the clearance between the image reading device and the original document mounting device to be extremely small, thereby preventing a decrease in reading accuracy of the image reading device as much as possible. To do.

[0006]

In order to achieve the above object, the document mounting apparatus according to claim 1 is configured so that a document for causing the image reading apparatus to read the image data can be mounted, and the document mounting apparatus is provided in the image reading apparatus. In a document loading apparatus that has a rack that meshes with a pinion and that moves in the image reading apparatus in accordance with the rotation of the pinion, the rack has at least the first tooth that meshes with the pinion and all the teeth of all other teeth. It is characterized in that it is formed lower than the toothbrush.

In this document loading apparatus, as shown in FIG. 17, a rack 1 that meshes with a pinion 101 of an image reading apparatus.
The first tooth 103 of No. 02 has a lower total tooth clearance than the other teeth, so that in the conventional image reading apparatus, the rack 11
The edge 114 of the cutting edge surface of the first tooth 113 of the second pinion 1
After passing through the position where the tooth 115 of the eleventh tooth 115 was in contact with the cutting edge surface 116, the tooth 103 is the tooth 1 on the far side of the image reading apparatus.
Abut on the tooth end surface of No. 05. In this case, since the meshing surface of the teeth 103 presses the teeth 105, the rack 102 and the pinion 101 easily mesh with each other.

On the other hand, even in the case of such a construction, as shown in FIG. 18, when the tooth 105 is located on the slightly clockwise side in FIG. The document loading device may not be pushed in due to the contact with the cutting edge surface 106 of the tooth 105. However, in this case, the range g in which the tooth 113 abuts on the tooth 115 is large in FIG.
Since the range h in which 03 touches the tooth 105 is small, the frequency of contact can be reduced. Further, in this case, when a clearance is formed between the pinion 101 and the rack 102 so that the document mounting apparatus can be pushed in even when they come into contact with each other, the clearance amount is shown in FIG. The amount of escape in the device can be reduced by (gh). As a result, it is possible to easily insert the document mounting apparatus, and it is possible to minimize deterioration in movement accuracy and positioning accuracy when reading the image data while moving the document mounting apparatus. The decrease can be prevented. Further, as compared with a complicated structure in which either the pinion or the rack is moved to avoid the contact between the teeth of the pinion and the rack, the contact between the teeth can be reliably avoided with a simple configuration.

According to a second aspect of the present invention, there is provided a document mounting apparatus according to the first aspect.
In the document loading apparatus described above, the rack is characterized in that the root width of at least the first tooth is narrower than the root width of the other teeth.

In this document loading device, the width of the tooth gap between the first tooth and the next tooth of the rack becomes larger than the reference tooth gap width. As a result, the tooth tips of the pinions easily enter the tooth spaces between the first tooth and the next tooth of the rack, so that the document loading apparatus can be easily inserted into the image reading apparatus.

According to a third aspect of the present invention, there is provided a document mounting apparatus according to the first aspect.
Alternatively, in the document mounting apparatus described in the paragraph 2, the rack is characterized in that at least the pitch between the first tooth and the next tooth is formed wider than the reference pitch.

In this document loading apparatus, since the width of the groove between the first tooth and the next tooth of the rack becomes large, the tips of the pinions are easily inserted, and as a result, the document loading apparatus is easily inserted into the image reading apparatus. . When the second tooth from the top of the rack comes into contact with the tooth of the pinion, the second tooth of the rack is already in contact with the preceding tooth of the pinion, so the second tooth of the rack is the pinion. It does not abut the teeth (see FIG. 15). For this reason, it becomes easy to insert the document loading device.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an embodiment of a document mounting apparatus according to the present invention will be described in detail with reference to the accompanying drawings for an example of use in an image reading apparatus.

1 and 2 respectively show a right side view and a front view of an image reading apparatus 1 according to the present invention. The image reading apparatus 1 includes an apparatus main body 2 and a carrier member (document mounting apparatus) 3 that holds a film-shaped transparent document such as a photographic film or a microfilm. The image reading device 1 is connected to an image display device (not shown) such as a computer device via an interface line for data transfer (for example, a Skazzy (SCSI) line) to read image data with high accuracy (hereinafter , "Main image reading"), all transparent originals 4 (see FIG. 12A) held on the carrier member 3 or images of a plurality of designated frames or a designated one frame. It is configured to enable so-called preview in which data is automatically read and displayed on an image display device or the like based on the image data. In this preview, the image display device can store the image data in association with each frame of the carrier member 3 and simultaneously display one image of each frame or a plurality of images on the display, As a result, the user can specify the image to be read on the display and read the main image by designating the frame of the image.

Each component will be described in detail below.

As shown in FIGS. 1 and 2, the apparatus main body 2 has a carrier insertion port 11 for inserting the carrier member 3 into the main body case K, and a carrier member 3 inserted into the carrier insertion port 11. A carrier table 12 for holding and guiding the inside of the main body case K, an irradiation unit 13 for irradiating the transparent original 4 held by the carrier member 3 with light, and a base 14 for moving the carrier table 12.
And a printed circuit board 1 on which a power supply unit 15 for supplying power to each unit and a digital processing circuit for performing various digital processes are mounted.
6, a power switch 17, and a connector 18 for connecting to a data transfer interface line. Further, the carrier table 12 is provided with a carrier guide portion 21 which moves the carrier member 3 to guide the image data to the image reading position in order to make the CCD 25 read the image data at the time of preview. At the time of reading the main image, the carrier table 12 is moved to move the carrier table 12 so that the CCD 25 can read the image data, and the carrier table guide portion 22 for guiding the carrier member 3 to the image reading position and the irradiation portion 1 are provided.
The light emitted by the light source 3 and transmitted through the transparent original 4 is almost 90
A reflector 23 for reflecting light at an angle of °, a condenser lens 24 for condensing the light reflected by the reflector 23, and a CCD 25 for photoelectrically converting the light condensed by the condenser lens 24.
And are arranged.

The carrier insertion port 11 has the upper side wall 1
1a is formed to be inclined, and its side wall 11a
By inserting the carrier member 3 along the above, the carrier member 3 can be easily guided to the carrier base 12.

The base 14 is fixed to the main body case K, and is parallel to the moving direction A (see FIG. 3) of the carrier member 3 as shown in FIGS. 2 to 5 and FIGS. 9 and 10, respectively. The carrier table 12 can be moved along the shafts 31, 31 fixed in K. Specifically, as shown in FIGS. 3, 4, 9 and 10, the carrier table 1 is provided below the base table 14.
A first motor 32, which is a stepping motor for moving the second gear 2, a second gear 34 that meshes with a first gear 33 axially mounted on the motor shaft of the first motor 32, and a second gear 3
4 and a third gear 36 having a small-diameter gear 37 coaxially provided and meshing with the small-diameter gear 35 coaxially provided. On the other hand, FIG.
A rack 38 that meshes with the small-diameter gear 37 is formed in the lower part of the inner side surface of the left body in FIG. Thereby, the first
When the motor 32 is driven, the first gear 33 and the second gear 3
4, the power is transmitted to the carrier base 12 via the small-diameter gear 35, the third gear 36, the small-diameter gear 37, and the rack 38, so that the carrier base 12 moves along the shafts 31, 31. In this case, the carrier table guiding unit 22 can move the carrier member 3 together with the carrier table 12 with extremely high accuracy of, for example, about 11 μm by the rotation of the first motor 32 in one step, whereby the image data is obtained. It is possible to increase the reading accuracy of. Further, the carrier table guide portion 22 is configured so as to be able to move one frame of the transparent original 4 attached to the carrier member 3, although not particularly limited, and thus, the internal space of the apparatus main body 2 is formed. Is being used effectively. The first motor 32 and various gears 33 to 3
7 constitutes the above-mentioned carrier stand guide portion 22.

The carrier base 12 is constructed so as to be able to guide the carrier member 3 from the front end to the rear end into the main body case K, and as shown in FIGS. 4 to 7, the carrier base 3 is moved. A second motor 41 that is a stepping motor, a fifth gear 43 that meshes with a fourth gear 42 that is mounted on the motor shaft of the second motor 41, and a small-diameter gear 44 that is provided coaxially with the fifth gear 43. And a sixth gear 45 that meshes with. On the other hand, the right side surface of the carrier member 3 in FIG.
A rack 46 that meshes with the gear 45 is formed (see FIGS. 8, 12B, 14 and 15). As a result, when the second motor 41 is driven, the fourth gear 42,
As a result of power being transmitted to the carrier member 3 via the fifth gear 43, the small diameter gear 44, the sixth gear 45 and the rack 46, the carrier member 3 moves inside the main body case K while being held by the carrier base 12. To do. In this case, the distance by which the carrier base 12 moves by one-step rotation of the second motor 41 is larger than the distance by which the carrier member 3 moves by one-step rotation of the first motor 32. Therefore, when previewing, the carrier member 3
Moves faster so that the reading speed of the image data is faster, which makes it possible to quickly specify the reading target at the time of preview. The second motor 41 and the various gears 42 to 45 form the carrier guide portion 21 described above.

The carrier member 3 is shown in FIGS.
As shown in each of FIGS. The carrier member 3 is not particularly limited, but the six document windows 51,
Of the carrier member 3, and projecting portions 52, 52 formed on both sides of each manuscript window 51 and projecting to the upper side of the mounting surface (front side of the drawing in FIG. 1A). Protrusions 5 having rectangular cross sections formed on both ends of the document windows 51, 51 located at both ends in the longitudinal direction (upper and lower ends in the figure) of the original windows 51 and projecting upward from the mounting surface.
3, 53 and.

In this carrier member 3, the protrusions 52, 5
By inserting the transparent document 4 between the protrusions 53, 53 and the protrusions 53, 53, the carrier member 3 is sandwiched between the protrusions 52, 52, and the protrusions 53, 53.
Can be attached to. In this case, photographic film or the like is generally divided into 6 frames at the time of print service. Therefore, when the transparent document 4 for 6 frames is fitted into the carrier member 3, each frame of the transparent document 4 is individually scanned in the document window. It is located right above 51, 51 ... As a result, when the irradiation unit 13 emits light,
The transmitted light reaches the reflecting plate 23 through the transparent original 4 and the original window 51.

Further, holes 54 and 55 are formed on the front end side (upper side in the figure) and the rear end part of the carrier member 3 in the longitudinal direction, and the hole parts 54 and 5 are formed.
Projection portions 56, 56, ... And projection portions 57, 57 having the same shape as the above-mentioned projection portion 53 are formed on both end sides in the width direction of 5 and both end sides in the longitudinal direction of the carrier member 3, respectively. In this case, the protrusions 56, 56 and the protrusions 53,
By fitting a brown base film, which is an unrecorded portion of the negative film, with 57, the brown base film is attached to the carrier member 3 in a state of being sandwiched between the protrusions 56, 56 and the protrusions 53, 57. be able to.
Thus, as a result of the brown base film covering the holes 57,
The density of light transmitted through the brown base film is detected by the CCD 25, and shading correction of an image and black-and-white color reference adjustment can be performed based on the density. In this case, the edge portion on the side without the sprocket hole has the protrusion 53,
The tea base film is made to have such a length as to come in contact with 57, and the tea base film is sandwiched between the protrusions 56, 56 and the protrusions 53, 57 by only fitting it. Therefore, the work of mounting the tea base film can be performed extremely easily. Further, by forming the holes 54 and 55 at both ends of the carrier member 3 in the longitudinal direction, shading correction and white reference adjustment are possible even when the carrier member 3 moves in either direction A. It has become. The holes 54 and 55 may function as reference holes for determining the image reading position.

Further, as shown in FIG. 2B, the carrier member 3 has a rack 46 at a substantially central portion of the right side surface in the thickness direction.
Are formed. As shown in FIG. 14, in the rack 46, the total tooth depth of the leading tooth 91 of the carrier member 3 is lower than that of the other teeth 92, 92 ... .. is formed to be narrower than the root width b of the teeth 92, 92, ..., In addition, as shown in FIG. Is formed wider than. Therefore, the tooth gap width e between the teeth 91 and 92 is larger than the tooth gap width f between the teeth 92 and 92.

As a result, when the carrier member 3 is inserted into the carrier insertion port 11, as shown in FIG. 15, as compared with the case where the teeth 91 are formed in the same shape as the teeth 92 (shown by broken lines in the same figure). Since the width of the tooth groove e of the rack 46 becomes large, the tooth tip of the sixth gear 45 easily enters the tooth groove e of the tooth 91 and the next tooth 92. Further, when the second tooth 92 from the beginning of the rack 46 comes to a position where it comes into contact with the tooth 98 of the sixth gear 45, the leading tooth 91 of the rack 46 becomes the sixth tooth.
The rack 46 and the sixth gear 45 easily mesh with each other, and the tooth 92 does not come into contact with the tooth 98 because the tooth 93 already in contact with the tooth 93 in front of the gear 45 is pressed. Therefore, the carrier member 3 can be easily inserted into the carrier insertion port 11.

On the other hand, even in the case of such a construction, when the tooth 93 is located on the slightly clockwise side in the same figure, as shown in FIG. The carrier member 3 is brought into contact with the cutting edge surface 96 of the tooth 93.
Sometimes cannot be pushed. However, in this case, while the range g in which the tooth 113 abuts on the tooth 115 is large in FIG. 19, the tooth 91 is larger than the tooth 9 as shown in FIG.
Since the range i that contacts 3 is small, the frequency of contact can be reduced. It should be noted that a clearance is formed between the sixth gear 45 and the rack 46 so that the carrier member 3 can be pushed in even when they come into contact with each other. It is (g-i) less than the amount of relief in the device. As a result, it is possible to easily insert the carrier member 3, and it is possible to minimize deterioration in movement accuracy and positioning accuracy when reading the image data while moving the carrier member 3. As a result, it is possible to improve the reading accuracy of the image data. The decrease can be prevented. Further, as compared with a complicated structure in which either the pinion or the rack is moved to avoid contact between the teeth of the pinion and the rack, the contact between the teeth can be reliably avoided with a simple configuration.

Further, as shown in FIG. 3C, the transparent original 4 on the hole 55 is formed on the side surface (thickness surface) of the carrier member 3 near the intermediate portion of the original window 51 near the hole 55. Is formed with a notch 58 for aligning with the image reading position. On the other hand, an interrupter is arranged in the main body case K (not shown), and if the interrupter detects the passage of the notch 58 together with the tip of the carrier member 3,
The main CPU 71 (see FIG. 13) outputs a drive signal for driving the motor to the second motor 41 based on the passage detection signal, so that the transparent original 4 can be aligned. ing.

As shown in FIG. 1, the above-mentioned irradiation unit 13 includes an inverter circuit 61, xenon lamps 62, 63 and 64 which are light sources for image reading, and a xenon lamp 6.
And a diffusion plate 65 for diffusing the light from 2, 63 and 64. The xenon lamps 62, 63, and 64 are controlled by the lamp control unit 81 (see FIG. 13) so as to be turned on in a fixed order, and emit light of wavelengths of blue, green, and red. As a result, the three colors transmitted through the transparent original 4 are photoelectrically converted by the CCD 25,
Image data of a color image is stored for each of the three colors in a buffer RAM 82 (see FIG. 13) in the image control unit described later. The light source is not limited to the xenon lamp, but may be, for example, the three LEDs capable of emitting the above-described three colors or the fluorescent lamp capable of emitting light including the three colors.

Next, referring to FIG. 13, the image reading device 1
The control system will be described.

The circuit block diagram shown in the figure shows a main circuit including the control circuit 70 of the image reading apparatus 1, and each electric circuit component is mounted on the printed board 16 described above. The control circuit 70 is a main C that is the core of various processes.
The PU 71, the image processing gate array 72 that executes image processing under the control of the main CPU 71, and the A / D conversion unit 73 that A / D converts the image signal output from the CCD 25.
An interface section 74 for converting image data and various signals into data of a predetermined communication format and transferring the converted data between the image display apparatus which is a host computer and the main CPU 71; and the main CPU 71.
The first and second motors 32, based on the drive signal of
It is provided with a first motor driver 75 and a second motor driver 76 that respectively drive 41. Further, the gate array 72 outputs a lighting control signal via the inverter circuit 61 to control the lighting of the xenon lamps 62 to 63, a lamp RAM 81 for storing image data, and an A / D conversion. The image control unit 83 that takes in the image data output from the unit 73 and stores the image data in the buffer RAM 82 corresponding to each pixel and executes the shading correction, the black and white color reference adjustment, and the storage interval signal output from the main CPU 71. A CCD control unit 84 for controlling photoelectric conversion of the CCD 25 by outputting a CCD control signal according to the shift signal and the clock signal.

Next, the image reading process in the image reading apparatus 1 will be described.

First, when the carrier member 3 is inserted into the carrier insertion port 11, the tip of the carrier member 3 passes through the interrupter, and the interrupter outputs a passage detection signal to the main CPU 71. The main CPU 71 outputs a drive signal and drives the second motor 41 to guide the carrier member 3 to a predetermined standby position in the main body case K. In this state, when a preview signal is output from the image display device via the interface unit 74, the main CPU 71 outputs a drive signal to the second motor driver 76 to drive the second motor 41,
Carrier member 3 until the passage detection signal of the tip is output
To move. At this time, the hole 54 is located directly below the xenon lamps 62-64. Next, main CPU7
1 is CC without turning on the xenon lamps 62 to 64.
By outputting a CCD control signal to the D control unit 84, C
The image control unit 83 is caused to read the image data from the CD 25. Next, the main CPU 71 causes the image control unit 83 to set the image data at this time to a luminance level of 0 gradation, thereby performing black level adjustment. in this case,
The brightness level of the image data is set to 256 gradations for each color, and 0 gradation corresponds to a black level and 256 gradation corresponds to a white level.

Next, the main CPU 71 turns on the xenon lamps 62 to 64 and causes the image controller 83 to read the image data from the CCD 25. The main CPU 71 controls the built-in R so that the maximum value of the image data read at this time has a gradation of about 230 to 250.
The second motor 41 according to the γ table stored in the OM
The white level adjustment is performed by adjusting the driving speed of the above, or adjusting the lighting time of each of the xenon lamps 62 to 64. At the same time, the main CPU 71 causes the image controller 83 to execute shading correction. That is, depending on the amount of light of the xenon lamps 62 to 64, the reflection coefficient of the reflection plate 23, the aberration of the condenser lens 24, etc., C
The correction data is generated so that the image data of one row of the CD 25 has a uniform gradation of 255. In this case, when the brown base film of the negative film is attached to the hole 54, the brightness transmitted through the tea base film is set to the white level, and when the brown base film is not attached, the hole 54 is opened. The correction data is automatically generated so that the brightness of the light that has passed directly becomes a white level. By these processes, the dynamic range of the brightness level of the image data can be automatically maximized. In the above-described series of operations, the black level adjustment, the white level adjustment, and the shading correction are performed by detecting the tip end portion by the hole 54, but these adjustments may be performed by the hole 55.

Next, the main CPU 71 outputs a drive signal, so that the end of the leading (first) document window 51 is positioned at the beginning of the reading position.
After moving, the image reading is started. At the time of reading an image, the lamp control unit 8 is switched from the main CPU 71.
By outputting various parameters to 1, the lamp control unit 81 outputs a lighting control signal to the inverter circuit 61, whereby the xenon lamps 62 to 64 are turned on. The main CPU 71 causes the image control unit 83 to read the image data of the image while outputting the drive signal and the CCD control signal.

The read image data is stored in the image controller 8
After the shading correction, the color correction, and the enlargement / reduction processing are performed by 2, the data is temporarily stored in the buffer RAM 83. Then, the main CPU 71 uses the buffer RAM 83.
The image data stored in is read and output to the interface unit 74. At the same time, the interface unit 74
Converts the image data into data of a predetermined communication format and outputs the converted data to the image display device.

After reading the image of the transparent original 4 corresponding to the first original window, the main CPU 71 continuously outputs the drive signal and rotates the second motor 41 by a predetermined number of steps to make the second original. The carrier member 3 is moved so that the end of the window 51 is located at the beginning of the reading position. Then
The main CPU 71 causes the image control unit 83 to read the image data of the transparent original 4 by outputting various parameters to the lamp control unit 81 and the image control unit 83. The main CPU 71 repeats these processes, and sequentially supplies the third to sixth document windows 51, 5
The image data of the transparent manuscript 4 of 1 ... Is read and the image data is output to the interface section 74 each time. Note that in this preview processing, CC
At D25, the outputs of a plurality of adjacent CCD elements are combined into one pixel data, so that the reading is performed at a resolution of about 50 to 300 dpi, which is lower than the resolution at the time of reading the main image. Thereby, the reading time of the preview can be shortened. Further, since the image reading accuracy may be somewhat low, some play between the carrier base 12 and the carrier member 3 is allowed, and for example, the opening area of the carrier insertion port 11 may be widened, By providing a clearance between the rack 46 and the sixth gear 45 to loosen the engagement, the main body case K of the carrier member 3
It can be easily inserted into the inside.

The image display device stores the input image data in the image data RAM (not shown), and when a predetermined key operation is performed, the image of the transparent original 4 in the designated original window 51 is displayed on the display device. To do.

On the other hand, when the user confirms the image on the display device and then designates a frame by key operation,
A frame designation signal is output from the image display device to the main CPU 71 via the interface unit 74. Main CP
The U 71 drives the second motor 41 by a predetermined number of steps by outputting a drive signal to the second motor driver 76, so that the document window 51 of the designated frame is located at the beginning of the reading position. To guide you. Next, the main CPU 71 starts the main image reading, and the first
By outputting a drive signal to the motor driver 75, the first motor 32 is driven by a predetermined number of steps so that the carrier table 12 moves by one frame of the document window 51. At the same time, the main CPU 71 outputs a lighting control signal and a CCD control signal,
The above-mentioned shading correction and black-and-white color reference adjustment are executed and the image data is read. In this case, the carrier base 12 in one step rotation of the first motor 32
Since the moving distance of is extremely small, the image can be read with high accuracy. The read image data is output to the image display device by the main CPU 71 through the interface unit 74 in the same manner as described above. After that, in the image display device, an image display process based on the image data, an image processing / correction process such as brightness adjustment of the image data, an embedding process for fitting an image of an arbitrary frame into an image of another frame, and an MO (optical Magnetic disk) and D
Writing processing to a storage medium such as AT, MD, and floppy disk is performed.

In the above embodiment, an example in which the image is read based on the light transmitted through the transparent original 4 has been described, but the present invention is not limited to this and can be applied to the case where the image is read based on the reflected light. Of course.

Further, although the rack 46 is formed of a sack rack in the present embodiment, it may be formed of a sack rack, and its shape can be changed appropriately. It is also possible to provide a motor and a pinion pivotally attached to the motor on the carrier member 3 side and a rack on the image reading device 1 side. However, in such a case, since it is necessary to dispose a motor, a power source, etc. on the carrier member 3 side, in order to make the carrier member 3 thinner and smaller, as shown in the present embodiment, the carrier member 3 It is preferable to arrange a rack on the 3 side.

Further, in the present embodiment, the total tooth depth of only the first tooth 91 that meshes with the pinion is formed lower than the entire tooth depth of the other tooth 92, but the present invention is not limited to this and the tooth 91 next to the tooth 91 is not limited to this. The teeth 92 may also be formed so that the total tooth clearance is low or the overall tooth clearance is sequentially increased.

[0041]

As described above, according to the document loading apparatus of the first aspect, at least the first tooth engaging with the pinion is formed lower than the other teeth, so When the clearance is formed between the pinion and the rack so that the document mounting apparatus can be pushed in even when the contact is made, the amount of the clearance can be reduced. As a result, it is possible to make it easy to insert the document mounting apparatus, and it is possible to minimize deterioration of movement accuracy and positioning accuracy when reading the image data while moving the document mounting apparatus. The decrease can be prevented.

According to the document loading apparatus of the second aspect, the width of the tooth gap between the first tooth and the next tooth of the rack becomes larger than the reference tooth gap width, and as a result, the first tooth and the next tooth of the rack are Since the pinion tip of the pinion is easily inserted in the tooth groove with the tooth, the document mounting apparatus is easily inserted into the image reading apparatus.

According to the document loading apparatus of the third aspect, since the tooth gap width between the first tooth and the next tooth of the rack becomes large, the tip of the pinion is easily inserted, and at the top of the rack 2 When the second tooth comes into contact with the pinion tooth, the second tooth of the rack does not abut the pinion tooth because the first tooth of the rack is already in contact with the previous tooth of the pinion. It becomes easy to insert the document loading device into the image reading device.

[Brief description of drawings]

FIG. 1 is a right side sectional view of an image reading apparatus according to an embodiment.

FIG. 2 is a front perspective view of the image reading apparatus according to the present embodiment.

FIG. 3 is a right side view of a carrier guide section and a carrier stand guide section in the image reading apparatus according to the present embodiment.

FIG. 4 is a front view of a carrier guide section and a carrier stand guide section in the image reading apparatus according to the present embodiment.

FIG. 5 is a plan view of a carrier guide section and a carrier stand guide section in the image reading apparatus according to the present embodiment.

FIG. 6 is a right side view of a carrier guide unit in the image reading apparatus according to the present embodiment.

FIG. 7 is a front view of a carrier guide unit in the image reading apparatus according to the present embodiment.

FIG. 8 is a plan view of a carrier guide unit in the image reading apparatus according to the present embodiment.

FIG. 9 is a right side view of a carrier table guide portion in the image reading apparatus according to the present embodiment.

FIG. 10 is a front view of a carrier table guide portion in the image reading apparatus according to the present embodiment.

FIG. 11 is a plan view of a carrier table guide portion in the image reading apparatus according to the present embodiment.

FIG. 12 (a) is a plan view of a carrier member,
(B) is a right side view of the carrier member, (c) is a left side view of the carrier member, (d) is a sectional view of the carrier member, and (e) is a front view of the carrier member.

FIG. 13 is a main circuit block diagram of the image reading apparatus according to the present embodiment.

FIG. 14 is a partially enlarged view of the rack of the carrier member according to the present embodiment.

FIG. 15 is a partially enlarged view showing the meshing relationship between the rack and the sixth gear according to the present embodiment.

FIG. 16 is a partially enlarged view showing the meshing relationship between the rack and the sixth gear according to the present embodiment.

FIG. 17 is a diagram for explaining a meshing relationship between a rack and a pinion according to the present invention.

FIG. 18 is a diagram for explaining a meshing relationship between a rack and a pinion according to the present invention.

FIG. 19 is a diagram for explaining a meshing relationship between a rack and a pinion in a conventional image reading device.

[Explanation of symbols]

 1 Image Reading Device 3 Carrier Member 4 Transparent Original Document 45 6th Gear 46 Rack 91 Teeth 92 Teeth

Claims (3)

[Claims] 1. An image reading device is provided with a rack on which an original for reading image data can be mounted, and a rack that meshes with a pinion provided in the image reading device is provided, and the rack is rotated according to the rotation of the pinion. In the document loading apparatus that moves in the image reading apparatus, the rack is formed such that at least the first tooth engaging with the pinion is lower than the other teeth. Mounting device. 2. The document mounting apparatus according to claim 1, wherein the rack has a root width of at least the first tooth narrower than a root width of another tooth. 3. The document mounting apparatus according to claim 1, wherein the rack has a pitch between the at least first tooth and the next tooth wider than a reference pitch.