JP2001077980A - Image reader - Google Patents

Abstract

PROBLEM TO BE SOLVED: To configure an image reader with inexpensive components without using a forced vibration attenuating member and to prevent excessive quality. SOLUTION: A sub-scanning control condition discriminator 40 selects a scanning control condition (scanning speed) at a magnification higher than a magnification designated by a user and closest thereto among scanning control conditions A-E, with each of preset magnifications (e.g. 100%, 150%, 200%, 300%, 400%) according to the magnification designated by the user. A motor control circuit 27 scans a full/half-rate carriage 4 in the sub-scanning direction according to the selected scanning control condition. Furthermore, image data read by a magnification arithmetic control circuit 42 are reduced by a reduction arithmetic unit (reduction circuit) 43 in the subscanning direction so that the read image data have the magnification designated by the user (sub-scanning direction) and a main scanning management arithmetic unit 32 reduces/magnifies the reduced data in the main scanning direction (magnification processing).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to variable power control of a drive system of an image reading apparatus.

[0002]

2. Description of the Related Art Conventionally, an image reading apparatus generally employs a reduction optical system using a full / half-rate carriage, and has a configuration in which the whole area of a document is read by scanning the carriage. Here, FIG. 9 is a conceptual diagram showing a document reading method by a general image reading device and a configuration of the image reading device. In the figure, an original 1 is placed on a platen glass 2 with the original side down. At the time of image reading, a full / half rate carriage 4 having a built-in illumination lamp 3 for irradiating the document surface is scanned in the sub-scanning direction. The full / half rate carriage 4 is driven at a predetermined speed by a drive motor 5, a timing belt 6, and a capstan pulley 7. During the scanning, the reflected light from the document surface is guided to the imaging lens 8 by the mirror of the full / half rate carriage 4 and formed on the CCD sensor 9. The CCD sensor 9 outputs the document image as an RGB signal to a subsequent circuit.

In the above image reading apparatus, a method of reducing or enlarging a document image is as follows. Here, FIG. 10 is a block diagram showing a configuration of a conventional image reading apparatus. In FIG. 10, a scaling signal corresponding to a user-specified magnification from the M / C scaling control circuit 20 is supplied to an IPS scaling control circuit 21. The IPS scaling control circuit 21 supplies a scaling control signal in the sub-scanning direction from the scaling signal to the motor driver scaling control circuit 22 and sends a scaling control signal in the main scanning direction to the main scanning scaling calculator 32. Supply.

The motor driver scaling control circuit 22 supplies the scaling control signal to a sub-scanning scaling calculator 23. The sub-scanning magnification calculator 23 includes a magnification profile calculation circuit 2
4, a magnification profile in the sub-scanning direction is calculated according to the scaling control signal, a drive current calculation circuit 25 calculates a drive current of the drive motor 5 according to the magnification profile, and a scan length calculation circuit 26 calculates the drive current. Is calculated. The motor control circuit 27 drives the drive motor 5 that scans the full / half-rate carriage 4 in the sub-scanning direction according to the drive current of the drive motor 5 and the scan length. Thereby, the full / half rate carriage 4 is scanned in the sub-scanning direction at a scanning speed according to the designated magnification.

An RGB signal corresponding to a document image output from the CCD sensor 9 by the scanning of the full / half rate carriage 4 is converted into a digital signal by an A / D converter 30, and a shading correction circuit 31 is provided. Is used to perform shading correction. Then, in the main scanning scaling calculator 32, after the filtering process by the filter 33, the scaling calculation control circuit 34 and the reduction calculator (reduction circuit) 3 according to the scaling control signal from the IPS scaling control circuit 21.
5. Reduction / enlargement (magnification processing) in the main scanning direction is performed by the enlargement arithmetic unit (memory, enlargement circuit) 36. The reduced / enlarged document image is supplied to an image data circuit 37 and then to a subsequent circuit.

As described above, in the conventional image reading apparatus, l
By transmitting a scaling control signal from the PS scaling control circuit 21 to the motor control side, parameters such as a scan profile are changed so as to obtain a scanning speed corresponding to the magnification, and scaling processing is performed in the sub-scanning direction. Create read data that does not need to be applied. In the main scanning direction, the main scanning magnification calculator 32 performs a scaling process.
After being converted into read data of a predetermined magnification, the subsequent processing is performed as image data.

[0007]

As described above, according to the conventional image enlarging / reducing technology, the scanning speed is adjusted according to the magnification so that the read data in the sub-scanning direction need not be subjected to the scaling process. Has changed. This is for the purpose of preventing image quality from deteriorating due to so-called interpolation processing in which information originally not included in the read data is created as image data. In the case of a color copying machine, 25% to 400%
Since it is common to change the magnification in increments of%, the image quality must be guaranteed in this entire magnification range.

Usually, in order to read a color image with a satisfactory image quality, it is necessary to make the reading position shift in the sub-scanning direction about ± 0.3 pixels or less. FIG. 11 shows the target deviation value of the reading position in the sub-scanning direction in the variable power range.

There are the following three problems with this method. Since the speed change between the magnifications (25% to 400%) is as large as eight times, there is no effective vibration countermeasure in the entire region. The harmonic component of the excitation frequency of the drive motor 5 changes according to the magnification as shown in FIG. As described above, since the harmonic component of the excitation frequency of the drive motor 5 changes depending on the magnification, a resonance point with a subsequent component always occurs at some magnification, and a vibration peak occurs, thereby deteriorating the image quality. In the variable power control according to the conventional technology, as shown in FIG.
Since the scanning control condition (magnification profile) at the time of magnification change is calculated by multiplying the magnification factor based on the scanning control condition (magnification profile) of 100%, the degree of freedom in the magnification profile is small and partial Improvement, that is, it is not possible to optimize the profile of an arbitrary magnification to improve the read image quality.

[0010] To cope with this, as a main improvement measure, the following improvement measures are combined. However, using a vibration damping member such as an HB five-phase motor or a magnet damper causes a problem that the cost is increased.・ Use of high-precision low-vibration motor such as HB 5-phase motor ・ Use of forced vibration damping member such as magnet damper ・ Use of high-precision control method such as micro-step ・ Use of vibration insulating member to full / half-rate carriage ・ Mirror Installation of forced vibration damping member

On the other hand, the reading quality at 100% is improved so that the target level is achieved in the entire zoom range. Therefore, as shown in FIG. 14, there is a problem that the quality is excessive at 100%. Even with the high-precision motor and the vibration damping member described above, a resonance point (resonance phenomenon) with the subsequent component occurs at a magnification at which the natural vibrations of the mirror and the carriage match, and the read image quality is partially large. There is a problem of deterioration.

The present invention has been made in view of the above circumstances, and can be configured with inexpensive components without using a forced vibration damping member, and can prevent excessive quality. It is intended to provide.

[0013]

According to a first aspect of the present invention, there is provided an image forming apparatus comprising: reading means for reading an image of a document in a main scanning direction; Scanning means for performing relative movement scanning in the sub-scanning direction, and storage means for storing a plurality of scanning control conditions for performing relative movement scanning in the sub-scanning direction by the scanning means in correspondence with each of a plurality of preset reading magnifications; Calculating means for calculating an image having a magnification that does not match the predetermined plurality of reading magnifications, based on the image read according to the scanning control conditions stored in the storage means.

According to the present invention, a plurality of scanning control conditions for performing relative movement scanning in the sub-scanning direction by the scanning means are stored in the storage means in correspondence with each of a plurality of preset reading magnifications. When reading a document image, the scanning unit determines the speed in the sub-scanning direction according to the scanning control conditions stored in the storage unit, regardless of the reading magnification designated by the user. After the reading of the document image by the reading unit, the calculating unit converts an image having a magnification that does not match the preset plurality of reading magnifications based on the image read according to the scanning control conditions stored in the storage unit. calculate. Accordingly, by setting the scanning control conditions (scanning magnification for scanning) to several points, it is possible to avoid resonance by controlling the natural vibration in the subsequent stage by using inexpensive components without using a forced vibration damping member. Become. In addition, by setting each scanning control condition corresponding to each of a plurality of preset reading magnifications, each scanning control condition can be optimized, and excessive quality can be prevented.

[0015]

Embodiments of the present invention will now be described with reference to the drawings. A-1. Configuration of Embodiment FIG. 1 is a block diagram illustrating a configuration of an image reading device according to an embodiment of the present invention. Parts corresponding to those in FIG. 10 are denoted by the same reference numerals, and description thereof is omitted. In the figure,
The sub-scanning control condition determiner 40 determines scanning control conditions (magnification profiles) A, B, C, D, and E for each preset magnification.
In accordance with a scaling control signal from the motor driver scaling control circuit 22, a scanning control condition of a predetermined magnification is selected. The motor control circuit 27 drives the drive motor 5 according to the scanning control condition selected by the sub-scanning control condition determining unit 40.

The scanning control conditions A, B, C, D and E are as follows:
It is set as follows: In the present embodiment, instead of the scanning speed of the magnification set by the user at the time of enlarging or reducing, as shown in FIG. 2, a preset magnification (for example, 100%, 150%)
%, 200%, 300%, and 400%), and performs a reduction process of subtracting information from the image data to create image data in the sub-scanning direction at a magnification designated by the user. The method of setting the magnification will be described later. At this time, as the scanning control condition, a scanning control condition having a magnification which is larger than the magnification designated by the user and has the closest magnification is selected. Therefore, unlike the enlargement processing, it is not necessary to create information that is not originally in the read image data as the image data, so that it is possible to prevent the read image quality from deteriorating. At the preset scanning speed, as shown in FIG. 2, the productivity is reduced because the scanning speed is lower than the scanning speed of the magnification designated by the user. Productivity can be minimized.

The parameters of the scanning control conditions A, B, C, D and E are as follows. -Scan profile shape-Startup time / acceleration-Startup division time-Current value

FIG. 3 is a conceptual diagram showing the relationship between the scanning control conditions, the scanning speed, the scaling factor, and the vibration generated by the two-phase motor according to the present embodiment. In this embodiment,
The scanning control condition A is a scanning speed corresponding to 100%, and the magnification corresponding range is 25% to 100%. Similarly,
The scanning control condition B is a scanning speed equivalent to 150%, and the variable magnification range is 101% to 150%. The scanning control condition C is a scanning speed equivalent to 200%, and its variable magnification range is 151% to 200%. The scanning control condition D is a scanning speed equivalent to 300%, and the variable magnification range is 201% to 300%. The scanning control condition E is
The scanning speed is equivalent to 400%.
301% to 400%. For example, if the user specifies 120% as the magnification, it is larger than 120%,
The scanning control condition B of the closest magnification of 150% is selected. The vibration generated by the two-phase motor will be described later.

The sub-scanning magnification calculator 41 includes a magnification calculation control circuit 42 and a reduction calculator 43. The magnification calculation control circuit 42 determines a preset magnification (for example, 100) according to a magnification control signal from the IPS magnification control circuit 21.
%, 150%, 200%, 300%, and 400%) so that the image data read at one of the scanning speeds becomes image data at a magnification (sub-scanning direction) specified by the user.
The reduction calculator (reduction circuit) 43 performs reduction in the sub-scanning direction (magnification processing). For example, as described above, when the user specifies 120% as the magnification, scanning is performed under the scanning control condition B of 150%, so the reduction arithmetic unit (reduction circuit) 43 reduces the size from 150% to 120%. Will be done. The document image reduced in the sub-scanning direction is supplied to the main scanning scaling calculator 32, and reduced / enlarged (magnification processing) in the main scanning direction as in the related art.

A-2. Next, an operation of the above-described embodiment will be described. M /
The scaling signal according to the magnification specified by the user from the C scaling control circuit 20 is supplied to the IPS scaling control circuit 21. IP
In the S scaling control circuit 21, a scaling control signal in the sub-scanning direction is converted from the scaling signal to the motor driver scaling control circuit 2.
2 and the sub-scanning magnification calculator 41, and the scaling control signal in the main scanning direction is supplied to the main scanning scaling calculator 32.

In the motor driver scaling control circuit 22, the scaling control signal is supplied to a sub-scan scaling calculator 23.
In the sub-scanning control condition judging unit 40, the scanning control conditions (magnification profiles) A, B, and C of the respective magnifications set in advance according to the magnification control signal from the motor driver magnification control circuit 22, that is, according to the magnification designated by the user. , D, E, a scanning control condition of a predetermined magnification is selected. And
In the motor control circuit 27, the drive motor 5 that scans the full / half rate carriage 4 in the sub-scanning direction is driven according to the selected scanning control condition. Accordingly, the full / half-rate carriage 4 is scanned in the sub-scanning direction under the scanning control condition (scanning speed) of a magnification larger than the magnification designated by the user and closest to the magnification.

The scanning of the full / half rate carriage 4 converts the RGB signals output from the CCD sensor 9 in accordance with the original image into digital signals by an A / D converter 30. Is used to perform shading correction. Then, in the magnification calculation control circuit 42, a preset magnification (for example, 100) is set in accordance with the magnification control signal from the IPS magnification control circuit 21.
%, 150%, 200%, 300%, and 400%) so that the image data read at one of the scanning speeds becomes image data at a magnification (sub-scanning direction) specified by the user.
The image is reduced (magnification processing) in the sub-scanning direction by a reduction arithmetic unit (reduction circuit) 43. Further, the original image reduced in the sub-scanning direction is subjected to reduction / enlargement (magnification processing) in the main scanning direction by the main scanning scaling calculator 32 in the same manner as in the prior art, and then the image data is processed. 37.

According to the above-described embodiment, the three problems of the prior art are improved as follows, and the driving by a low-cost motor such as an HB two-phase motor, which cannot be realized by a color image reading apparatus. Becomes possible, and
Since the forced vibration damping member can also be omitted, an inexpensive color image reading device can be configured.

The speed change between magnifications can be reduced to about four times. In particular, since the reduction side can be deleted, the degaussing power can be reduced. Since the set scanning speed is a few points, it is possible to avoid resonance by controlling the natural vibration at the subsequent stage. Further, as shown in FIG. 3, the variable magnification range and each scanning speed are set so that the harmonic component of the excitation frequency of the motor (refer to the vibration generated by the two-phase motor) always has a constant frequency. This makes it easier to avoid resonance due to the natural vibration at the subsequent stage. That is, the harmonic component of the excitation frequency of the two-phase motor generated as vibration at this time is:
Since each reading magnification substantially overlaps, resonance caused by the natural vibration of the carriage and the mirror can be easily avoided by designing the natural vibration of the carriage and the mirror so as to avoid the frequency of the harmonic component. Scan control conditions A for the set discrete reading points,
Since B, C, D, and E are independently set corresponding to each of a plurality of preset reading magnifications, it is possible to optimize the scanning control conditions at that point, thereby achieving the target In this case, it is possible to set a read image quality suitable for the image quality, and to prevent an excessive quality.

Further, as shown in FIG. 4, the reading position deviation target value in the sub-scanning direction according to the present embodiment only needs to be cleared at five points of the scanning control conditions A, B, C, D and E. Since the parameters of the point profile (scan profile shape, rise time / acceleration, rise division time, current value) are independent, the reading position deviation in the sub-scanning direction is minimized at each point (read magnification). Can be set to

In the above-described embodiment, the scanning control conditions A, B, C, D, and E are set to 100%, 150%, and 2%.
It was set to correspond to 00%, 300%, and 400%.
However, the present invention is not limited to this, and may be set, for example, in accordance with a scaling ratio (141% in the case of A4 → A3) at which the image of the document becomes a substantially specific paper size.

In this embodiment, depending on the set value of the reading magnification (sub-scanning speed) for each of the scanning control conditions A, B, C, D, and E, a reduction process for adjusting the read image data to the magnification set by the user. It is necessary to prepare a large number of line buffers for performing For example, when the reading magnification becomes four times the magnification specified by the user, a line buffer for three lines is required at least to hold the image data in the main scanning direction. Thus, depending on how to set the reading magnification, the number of line buffers to be prepared increases, which leads to an increase in cost. Therefore, in order to minimize the number of line buffers, the interval of the reading magnification may be set to be twice or less. In this case, the reading magnification selected for the magnification specified by the user is always 2 times or less,
If a line buffer for one line is prepared, reduction processing can be performed.

In the above-described image reading apparatus, 1
When a configuration is provided that includes a page memory that holds image data for a page, the speed at which image data is read and written to the page memory while scanning in the sub-scanning direction (hereinafter, referred to as “the speed”).
Compared to the effective scanning speed), by slightly reducing the printing speed at which image data is read out sequentially from the page memory and printed, the printing operation can be started immediately after the document is read in the sub-scanning direction. Become. That is, it is possible to print out almost at the same time as reading the original, so-called first output time (FCOT)
Can be shortened, and efficient operation can be achieved. However, as described above, in the present embodiment,
Since the reduction processing (that is, thinning processing) for reducing the image data read before writing to the page memory is performed, the effective scanning speed is reduced. Depending on the set reading magnification, the above-described effective scanning speed> printing speed May be reversed.

As described above, when the speed relationship is reversed, if the printing operation is started immediately after the reading of the original in the sub-scanning direction is started, the image data is read from the page memory and printed. Catching up with the operation of writing image data to page memory,
Alternatively, some kind of control is required to prevent this, because the vehicle is overtaken. As the control, for example,
If the printing operation is started after the reading of the document in the sub-scanning direction is completed, that is, when the writing of the image data to the page memory is completed, the printing operation can be executed reliably and easily. However, in such an operation control, even when the effective scanning speed is sufficiently higher than the printing speed, the printing operation is started after the document reading is completed, so the first output time (FCOT)
Is delayed by the scanning time. Therefore, an operation control that can shorten the first output time (FCOT) will be described below.

A-3. First Operation Control Example First, a first operation control example of the present embodiment will be described. Here, FIG. 5 is a flowchart for explaining the first operation control example, and FIG. 6 is a conceptual diagram for explaining the first operation control example. When a copy start is instructed by the user, first, in step Sa1, a magnification set by the user is acquired, and in step Sa2, scanning control conditions (= reading magnification = scanning speed) are determined. Next, in step Sa3, the effective scanning speed is calculated according to the set magnification and the reading magnification of the determined scanning control condition. Next, in step Sa4, the effective scanning speed is compared with the printing speed unique to the system, and it is determined whether or not the effective scanning speed> the printing speed. If the effective scanning speed is greater than the printing speed, that is, if the effective scanning speed is higher than the printing speed, control is performed in step Sa5 so that the printing operation is started immediately after the reading is started. In other words, as shown in FIG. 6A, the effective scanning time T1 is shorter than the printing time T2, and the printing operation is started immediately after the start of reading.

On the other hand, if the effective scanning speed is not greater than the printing speed, that is, if the printing speed is higher than the effective scanning speed, control is performed in step Sa6 so that the printing operation is started after the reading is completed. In other words, as shown in FIG. 6B, the printing time T2 is shorter than the effective scanning time T1 ', and the printing operation starts after the reading is completed.

As described above, in the first operation control example, by controlling the printing start timing according to the magnitude relationship between the effective scanning speed and the printing speed, the first output time (FCOT) is controlled as much as possible as a system. Can be shortened.

A-4. Second Operation Control Example Next, a second operation control example of the present embodiment will be described. Here, FIG. 7 is a flowchart for explaining the second operation control example, and FIG. 8 is a conceptual diagram for explaining the second operation control example. When a copy start is instructed by the user, first, in step Sb1, the magnification set by the user and the length of the original placed on the platen glass are obtained. In step Sb2, the scanning control conditions (= reading magnification = scanning speed) are determined. decide. Next, in step Sb3,
The effective scanning speed is calculated according to the set magnification and the read magnification under the determined scanning control condition.

Next, in step Sb4, a scan end time until reading of the original is completed is calculated based on the effective scanning speed and the original length. In step Sb5, the scan end time and the system-specific printing speed are calculated. , The print start delay time is calculated. That is, as shown in FIG. 8A, the difference between the effective scanning time T1 and the printing time T2 obtained from the printing speed is calculated as the printing start delay time DT. Next, in step Sb6, operation control is performed so that the printing operation is started after the printing start delay time DT.
For example, as shown in FIG.
00% ", the effective scanning time T1 at this time is the printing time T
2, or when the effective scanning time T1 <the printing time T2 (corresponding to the above-described effective scanning speed> the printing speed), the printing start delay time DT becomes "0".
Control is performed so that the printing operation is started immediately after the reading is started.

On the other hand, as shown in FIG. 8C, the reading magnification is "200%", and the effective scanning time T1 'at this time.
Is longer than the printing time T2 (corresponding to the above-described printing speed> effective scanning speed), the printing operation is controlled to start after a printing start delay time DT1, which is the difference. As a result, the printing operation ends when the execution scan ends.

As described above, in the second operation control example, the printing magnification is calculated by calculating the printing start delay time, which is the difference between the effective scanning time and the printing time, and controlling the printing start timing according to the printing start delay time. , The first output time (FCOT) can be minimized.

[0037]

As described above, according to the present invention, according to the present invention, the scanning control condition for performing the relative movement scanning in the sub-scanning direction by the scanning means is stored in the storage means in correspondence with each of a plurality of preset reading magnifications. When reading the original image, the original image is read by the reading unit while scanning in the sub-scanning direction according to the scanning control conditions stored in the storage unit, and thereafter, the original image is read by the calculating unit. Based on the image read in accordance with the scanning control conditions stored in the storage means, an image having a magnification that does not match the predetermined plurality of reading magnifications is calculated, so that the forced vibration damping member is not required. The advantage is that resonance can be avoided.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of an image reading apparatus according to an embodiment of the present invention.

FIG. 2 is a conceptual diagram illustrating a relationship between scanning control conditions (magnification) and productivity according to the embodiment.

FIG. 3 shows scanning control conditions, scanning speeds,
It is a conceptual diagram which shows the relationship between the variable magnification response rate and the vibration generated in the two-phase motor.

FIG. 4 is a conceptual diagram illustrating a relationship between a scanning control condition (magnification) and a reading position shift amount in a sub-scanning direction according to the present embodiment.

FIG. 5 is a flowchart illustrating a first operation control example of the image reading apparatus according to the present embodiment.

FIG. 6 is a conceptual diagram illustrating the first operation control example.

FIG. 7 is a flowchart illustrating a second operation control example of the image reading apparatus according to the present embodiment.

FIG. 8 is a conceptual diagram for explaining the second operation control example.

FIG. 9 is a conceptual diagram illustrating a document reading method by a general image reading apparatus and a configuration of the image reading apparatus.

FIG. 10 is a block diagram illustrating a configuration of a conventional image reading apparatus.

FIG. 11 is a conceptual diagram illustrating a relationship (target value) between a magnification and a shift amount of a reading position in a sub-scanning direction in a color image image reading apparatus.

FIG. 12 is a conceptual diagram showing a change in a harmonic component of an excitation frequency of the drive motor 5 depending on a magnification.

FIG. 13 is a conceptual diagram for describing a method of changing a scanning profile in variable power control according to a conventional technique.

FIG. 14 is a conceptual diagram for explaining occurrence of image quality deterioration according to the related art.

[Explanation of symbols]

Reference Signs List 4 full / half rate carriage (scanning means reading means) 5 drive motor (scanning means) 8 imaging lens 9 CCD sensor (reading means) 32 main scanning variable magnification calculator 40 sub-scanning control condition judgment unit (storage means) 41 sub Scanning magnification calculator (calculation means) 42 Magnification calculation control circuit (calculation means) 43 Reduction calculator (calculation means) A to E Scan control conditions

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5B047 AA01 BA02 BB02 CA08 CB07 CB10 5C072 AA05 BA09 LA02 MA06 MB01 MB08 MB09 UA11 UA14 5C076 AA21 BA02 BA07 BB31 CA10 CB05

Claims (11)

[Claims] A scanning unit that relatively moves and scans the reading unit and the image of the document in a sub-scanning direction; and a relative movement in the sub-scanning direction by the scanning unit. A storage unit that stores a plurality of scanning control conditions for performing scanning in correspondence with each of a plurality of preset reading magnifications; based on an image read according to the scanning control conditions stored in the storage unit, An image reading apparatus comprising: a calculating unit that calculates an image having a magnification that does not match the plurality of set reading magnifications. 2. A magnification that does not match the plurality of preset magnifications by processing in a direction to reduce a data amount of an image read according to a scanning control condition stored in the storage means. The image reading device according to claim 1, wherein the image is calculated. 3. The method according to claim 1, wherein the plurality of scanning control conditions are such that, at each reading magnification, when the scanning unit relatively moves and scans the reading unit and the image of the document in the sub-scanning direction according to the scanning control condition. 2. The image reading apparatus according to claim 1, wherein the vibration of the means is set to be low. 4. The image according to claim 1, wherein the plurality of scanning control conditions are set corresponding to each of a plurality of reading magnifications at which a vibration frequency generated by the scanning unit becomes substantially constant. Reader. 5. The method according to claim 1, wherein the plurality of scanning control conditions include:
2. The image reading apparatus according to claim 1, wherein the image reading apparatus is set so as to correspond to each of a plurality of reading magnifications that are substantially integral multiples of 00%. 6. The image reading apparatus according to claim 1, wherein the plurality of scanning control conditions are set in accordance with a magnification ratio at which the image of the document has a substantially specific paper size. 7. The scanning control condition according to claim 1, wherein:
2. The image reading apparatus according to claim 1, wherein the image reading apparatus is set so as to correspond to each of a plurality of reading magnifications which are 2n times (n is an integer) of 00%. 8. A comparing means for comparing a reading scanning speed for reading an image according to the scanning control conditions stored in the storage means with a printing speed for printing an image read by the reading means, 2. The image reading apparatus according to claim 1, further comprising: a print start control unit that controls a print start timing of an image read by the reading unit based on the comparison result. 9. The printing start control means controls the printing start timing so that the printing operation is started immediately after the reading operation is started, when the comparison result by the comparing means is read scanning speed> printing speed. 9. The image reading device according to claim 8, wherein: 10. The printing start control means according to claim 7, wherein when the comparison result by said comparing means is a reading scanning speed <a printing speed, the printing operation is completed when the reading operation is completed.
9. The image reading apparatus according to claim 8, wherein the printing start timing is controlled based on the reading scanning speed and the printing speed. 11. The printing start control unit includes: a reading scanning time calculating unit that calculates a reading scanning time required to scan and read an image according to a scanning control condition stored in the storage unit; A delay time calculating means for calculating a delay time from the start of the reading scan to the start of the printing operation based on the reading scanning time calculated by the calculating means so that the printing operation is completed at the end of the reading scanning. 9. The image reading apparatus according to claim 8, wherein the print start timing is controlled based on the delay time calculated by the calculation unit.