JPH11164106A - Image input device, focus adjustment mechanism for the image input device, image processor and image-forming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify and facilitate the focus adjustment work of an image input device. SOLUTION: The movement of a first mirror base 2001 incorporating a halogen lamp for irradiating an original and a first mirror 206 and a second mirror base 2002 incorporating a second mirror 207 is independently controlled by a linear motor 2004. The first mirror base 2001 is fixed, the second mirror base, 2002 is moved by a fine distance each, and an optical path length is made to change. The optical path length for optimally forming images on a line sensor is obtained, the first mirror base 2001 and the second mirror base 2002 are controlled, so as to keep the optical path length and the images are inputted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to an image input apparatus of a movable optical system, a focus adjustment mechanism of the image input apparatus, an image processing apparatus, and an image forming apparatus.

[0002]

2. Description of the Related Art In recent years, image processing apparatuses using an optical system moving type image input method have been widely used.

[0003] Currently, the image input method mainly used is:
The document placed on the platen glass is illuminated by a lamp with a document pressure plate, and the reflected light is guided to a lens by a first mirror and a second mirror.

Here, the two mirrors are driven by a single wire controlled by a stepping motor or the like, and the optical path length is kept constant by satisfying a 2 to 1 speed ratio between the first mirror and the second mirror. Is controlled so that the reflected light of the document irradiated by the lamp always forms an image on the sensor via the lens.

[0005]

However, in the above conventional example, it is necessary to adjust the optical path length with high precision in order to form an image of the original on the sensor. In order to realize this, conventionally, a step of finely adjusting the position of the lens and adjusting the focus is required.

[0006] Since a special jig is required to perform the adjustment again, it is practically impossible to replace the lens and the sensor of the device once assembled.

[0007] Even if the positional accuracy of the lens is increased, errors due to bending and winding of the wire for driving the mirror, expansion and contraction of the wire itself, etc. also cause errors in the optical path length.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and has as its object the following:
An object of the present invention is to simplify and facilitate focus adjustment of an image input device.

[0009]

In order to achieve the above object, the present invention relates to an optical system moving type image input apparatus which scans an original by moving an optical system, and reads reflected light irradiated on the original. The optical path length from the document to the reading means is made variable by independently controlling a plurality of reflecting members leading to the means.

In this case, the optical path length can be changed by independently controlling the reflecting member, so that the step of finely adjusting the optical path length by finely adjusting the conventional lens is unnecessary. . Further, since the optical path length can be changed without disassembling the device, the optical path length can be easily adjusted even if it becomes necessary to adjust the optical path length again due to replacement of parts or the like.

A first reflecting member and a second reflecting member for guiding the reflected light illuminating the original to the reading means, wherein the first reflecting member is fixed and the second reflecting member is fixed; A focus adjusting mechanism for adjusting the image forming state of the reading unit by moving the member to change the optical path length may be provided.

With this configuration, the optical path length can be changed by performing control of fixing the first reflecting member and moving the second reflecting member without finely adjusting the lens, so that the focus adjustment can be performed. Work can be simplified. In addition, since the focus can be adjusted without disassembling the apparatus, even if it becomes necessary to adjust the focus again due to replacement of parts or the like, the focus can be easily adjusted. Further, by performing image input while maintaining the optical path length adjusted by the focus adjustment mechanism so as to obtain an optimal image forming state, high-quality image input becomes possible.

Further, the reflection member may be driven by a linear motor.

As described above, the motor for driving the reflecting member includes:
By using a linear motor that does not require wires, errors due to using wires are removed,
A more accurate image input device can be realized.

The adjustment by the focus adjustment mechanism may be executed when the power is turned on.

In this way, the focus is adjusted each time the power is turned on, so that a highly accurate image can always be input.

According to another aspect of the present invention, there is provided an image input apparatus of a movable optical system for scanning an original by moving an optical system, wherein a plurality of reflecting members for guiding reflected light illuminating the original to reading means are independently controlled. A focus adjustment mechanism for an image input apparatus, wherein an image forming state of the reading unit is adjusted by changing an optical path length from the document to the reading unit.

According to this configuration, the optical path length can be changed by independently controlling the reflecting member, so that the step of finely adjusting the optical path length by finely adjusting the lens in the related art becomes unnecessary. In addition, the focus adjustment operation can be simplified. In addition, since the focus can be adjusted without disassembling the apparatus, even if it becomes necessary to adjust the focus again due to replacement of parts or the like, the focus can be easily adjusted.

In addition, the apparatus has a first reflecting member and a second reflecting member for guiding the reflected light illuminating the original to the reading means. The first reflecting member is fixed and the second reflecting member is fixed. The imaging state of the reading unit may be adjusted by moving a member to change the optical path length.

With this configuration, since the optical path length can be changed by controlling the first reflecting member to be fixed and the second reflecting member to be moved, the focus adjustment operation can be simplified. .

Further, the image reading section for reading the original image of the image processing apparatus may include the image input device according to the present invention, and may perform a predetermined process on the image information read by the image reading section.

The image information read by the image reading unit is transmitted to an external device, subjected to various information processing to process the image information, and to perform processing such as forming an image on a recording material. Can be. Therefore, if the image input device according to the present invention is provided in an image processing device such as a facsimile, a scanner, a copying machine, or the like, an image processing device capable of inputting a document image with high accuracy can be provided.

Further, the image reading unit for reading the original image of the image forming apparatus may be provided with the image input device according to the present invention, and the image read by the image reading unit may be formed on a recording material.

According to this configuration, it is possible to provide an image forming apparatus capable of forming a high-quality image based on a document image input with high accuracy.

[0025]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described based on preferred embodiments.

FIG. 1 is an external view of a copying machine 100 as an image forming apparatus (image processing apparatus) according to an embodiment of the present invention.

In FIG. 1, reference numeral 201 denotes an image scanner unit (image input device) which reads a document and performs digital signal processing. Reference numeral 200 denotes a printer unit which prints out an image corresponding to the document image read by the image scanner 201 on a sheet in full color.

In the image scanner unit 201, 20
Reference numeral 2 denotes an original pressing plate, which is an original 20 on the original platen glass 203.
4 is irradiated with light from a halogen lamp 205. Light reflected from the original is guided to mirrors 206 and 207,
08, a line sensor (hereinafter referred to as CC)
D) Form an image on 210. The lens 208 is provided with an infrared cut filter 231.

The CCD 210 separates the light information from the original into colors, and obtains full-color information red (R), green (G),
The blue (B) component is read and sent to the signal processing unit 209.

Each color component reading sensor row of the CCD 210 is composed of 5000 pixels. As a result, 297 mm in the short side direction of the A3 size document, which is the largest size among the documents placed on the platen glass 203, is reduced by 40 mm.
Read at 0 dpi resolution.

Note that 205 and 206 are speeds v and 207
Scans the entire surface of the document by mechanically moving in the vertical direction (hereinafter, the sub-scanning direction) with respect to the electrical scanning direction (hereinafter, the main scanning direction) of the line sensor at 1 / 2V.

Reference numeral 211 denotes a standard white plate,
Correction data of the read data of the R, G, B sensors of -1 to 210-3 is generated.

The standard white plate has a substantially uniform reflection characteristic with visible light, and has a white color when visible. The output data of the visible sensors of the sensors 210-1 to 210-3 is corrected using the standard white plate.

The image signal processing unit 209 electrically processes the read signal to obtain magenta (M), cyan (C),
Decomposes into yellow (Y) and black (BK) components,
Send it to the printer unit 200. Also, the image scanner unit 2
01, one document scan (scan), M,
One of the components C, Y, and BK is sent to the printer 200, and one printout is completed by scanning the document four times in total.

The M, C, Y, and BK image signals sent from the image scanner unit 201 are transmitted to the laser driver 21.
Sent to 2. The laser driver 212 modulates and drives the semiconductor laser 213 according to the image signal. The laser light is reflected by a polygon mirror 214, an f-θ lens 215, and a mirror 21.
6 and scans over the photosensitive drum 217.

Reference numerals 219 to 222 denote developing units, which are a magenta developing unit 219, a cyan developing unit 220, and a yellow developing unit 2
21; a black developing unit 222; four developing units alternately contact the photosensitive drum, and develop the electrostatic latent images of M, C, Y, and BK formed on the photosensitive drum 217 with corresponding toners; .

Reference numeral 223 denotes a transfer drum.
4 or 225 to the transfer drum 2
23, and transfers the toner image developed on the photosensitive drum 217 to a sheet.

After the four colors M, C, Y, and BK are sequentially transferred in this manner, the sheet passes through the fixing unit 226 and is discharged.

The general operation of the apparatus has been described above.

Next, the image scanner 201 will be described in detail.

FIG. 2 shows the configuration of the image scanner 201 used in this embodiment.

Here, reference numeral 2001 denotes a first mirror stand,
A halogen lamp 205 (not shown) and a first mirror 206 as a first reflecting member are incorporated. Reference numeral 2002 denotes a second mirror base, and a second mirror 2 as a second reflecting member is provided.
07 is incorporated.

A guide rail 2003 supports one side of the first mirror base 2001 and the second mirror base 2002. The first mirror base 2001 and the second mirror base 2002 can be scanned by bearings or the like. .

Reference numeral 2004 denotes a linear motor, which includes a stator 2005 on which a magnetic material is magnetized, and movers 2006 and 2007 which move on the stator 2005 in parallel with the stator 2005.
, Linear scale 2008, linear scale 200
8 is constituted by scanning heads 2009 and 2010 for reading a position from the scanning head 8.

The movers 2006 and 2007 are the first
It is fixed to the mirror base 2001 and the second mirror base 2002, and the position is detected by the scanning heads 2009 and 2010.
It can be controlled independently.

FIG. 3 shows the configuration of the CCD 210 used in this embodiment.

Here, 210-1 is a light receiving element array for reading red light (R), and 210-2 and 210-3 are light receiving element rows for reading G and B wavelength components in order.

R, G, B of 210-1 to 210-3
Each of the sensors has an opening of 10 μm in the main scanning direction and the sub-scanning direction.

The three light receiving element arrays having different optical characteristics are monolithically mounted on the same silicon chip so that the R, G, and B sensors are arranged in parallel to each other to read the same line of the document. It is configured.

By using a CCD having such a configuration,
An optical system such as a lens is used in common for each color separation reading.

Thus, it is possible to simplify the optical adjustment for each of the R, G, and B colors.

FIG. 4 is a sectional view taken along the dotted line in FIG.

On a silicon substrate 210-5, a photo sensor 210-1 for reading R and photo sensors 210-2 and 210-3 for reading visible information of each of G and B are arranged.

An R filter 210-that transmits a red wavelength component of visible light is provided on the R photo sensor 210-1.
7 are arranged. Similarly, a G filter 210-8 is provided on the G photo sensor 210-2, and a B photo sensor 210
-3 is provided with a B filter 210-9. 2
10-6 is a flattening layer formed of a transparent organic film.

FIG. 5 is an enlarged view of the light receiving element.

Each sensor has 10 pixels per pixel in the main scanning direction.
It has a length of μm. Each sensor is located in the short direction (2
97 mm) at 5,000 pixels in the main scanning direction so that it can be read at a resolution of 400 dpi.

The distance between the lines of the R, G, and B sensors is 80 μm, and the distance between the R, G, and B sensors is 8 lines for a sub-scanning resolution of 400 dpi.

Next, the density reproduction method of the printer will be described.

In this embodiment, the laser 21 is reproduced by the well-known PWM method for reproducing the density of the printer.
The lighting time of No. 3 is controlled according to the image density signal. As a result, an electrostatic latent image having a potential corresponding to the laser lighting time is formed on the photosensitive drum 217. The developing devices 219 to 222 develop the latent image with an amount of toner corresponding to the potential of the electrostatic latent image, thereby performing density reproduction.

FIG. 6 shows the control operation of the printer for reproducing the density in this embodiment.

Reference numeral 10201 denotes a printer pixel clock, which corresponds to a resolution of 400 dpi.

This clock is generated by the laser driver 212.

A triangular wave 10202 of 400 lines is generated in synchronization with the printer pixel clock 10201. This 4
The period of the triangular wave 10202 of the 00 line is the pixel clock 102
It is the same as the period of 01.

400 dp sent from the image processing unit 209
M, C, Y, B of 256 gradations (8 bits) at i resolution
The K image data and the 200-line / 400-line switching signal are transmitted in synchronization with the CLOCK signal, but are synchronized with the printer pixel clock 10201 by a FIFO memory (not shown) by the laser driver 212.

The 8-bit digital image data is converted into an analog image signal 10203 by a D / A converter.
Then, it is compared with the aforementioned 400-line triangular wave 10202 in an analog manner, and a PWM output 10204 of 400 lines is generated.

The digital pixel data changes from 00H to FFH, and the 400-line PWM output 10204 has a pulse width corresponding to this value. One cycle of the 400-line PWM output is 63.5 μm on the photosensitive drum.

In the laser driver 212, in addition to the 400-line triangular wave, a 200-line triangular wave 10205 having a double cycle is generated in synchronization with the printer pixel clock 10201.

Then, this 200-line triangular wave 10205
Is compared with the analog image signal 10203 of 400 dpi to obtain a PWM output signal 10206 of 200 lines.
Generate

The PWM output signal 10206 of 200 lines forms a latent image on the photosensitive drum at a period of 127 μm as shown.

In density reproduction with 200 lines and density reproduction with 400 lines, the minimum unit for density reproduction of 200 lines is 127 μm, which is twice that of 400 lines, so that tone reproduction is better.

In terms of resolution, 400 lines that reproduce the density in units of 63.5 μm are more suitable for high-resolution image recording.

As described above, 200-line PWM recording is suitable for gradation reproduction, and 400-line PWM recording is excellent in terms of resolution.
The PWM of the 0 line is switched.

The signal for this is a 200-line / 400-line switching signal, and is input from the image processing section 209 to the laser driver in pixel units in synchronization with the image signal of 400 dpi.

When the 200/400 line switching signal is at the L level, the PWM output of 400 lines is selected, and when it is at the H level, the PWM output of 200 lines is selected.

The image signal processing section 209 will be described.

FIG. 7 is a block diagram showing the flow of image signals centering on the image signal processing unit 209 in the image scanner unit 201. The image signal output from the CCD 210 is input to the analog signal processing unit 101 and subjected to gain adjustment and offset adjustment.
2, an 8-bit digital image signal R ₁ , G for each color signal
It is converted to _1, B _1. Thereafter, the signal is input to the shading correction unit 103, and a known shading correction is performed for each color using a read signal of the standard white plate 211.

Reference numeral 121 denotes a clock generation unit which generates a clock for each pixel. A main scanning address counter 122 counts clocks and generates a one-line pixel address output. Reference numeral 123 denotes a decoder which decodes a main scanning address from the main scanning address counter 122 and outputs a line-based C such as a shift pulse or a reset pulse.
A CD drive signal, a VE signal indicating an effective area in a one-line read signal from the CCD, a line synchronization signal HSYN
Generate C. The main scanning address counter 122 is HSY
It is cleared by the NC signal, and the counting of the main scanning address of the next line is started.

As shown in FIG. 5, since the light receiving sections 210-1, 210-2, 210-3 of the CCD 210 are arranged at a predetermined distance, the line delay circuit 104,
At 105, a spatial shift in the sub-scanning direction is corrected.

More specifically, the R and G signals for reading the original information in the sub-scanning direction with respect to the B signal are line-delayed in the sub-scanning direction to match the B signal.

Reference numeral 106 denotes a known input masking unit.
R, G, B filters 210-7, 21 of CCD 210
This is a part for converting a read color space determined by the spectral characteristics of 0-8 and 210-9 into an NTSC standard color space, and performs a matrix operation as shown in the following equation.

[0081]

(Equation 1) Reference numeral 107 denotes a light amount / density conversion unit, and a lookup table R
OM, and the luminance signals of R ₄ , G ₄ and B ₄ are C
It is converted into density signals of ₀ , M ₀ and Y ₀ .

Reference numeral 108 denotes a line delay memory, which outputs a UCR signal from a R ₄ , G ₄ , B ₄ signal in a black character determination unit described later.
The image signals C ₀ , M ₀ , and Y ₀ are delayed by the line delay up to the determination signal such as FILTER or SEN. As a result, the C ₁ , M ₁ , and Y ₁ image signals and the black character determination signal for the same pixel are input to the masking UCR circuit 109 at the same time.

A masking and UCR circuit 109 extracts a black signal (BK) from the input three primary color signals Y ₁ , M ₁ , and C ₁ , and further corrects color turbidity of a recording color material in a printer. The operation is performed and Y ₂ , M ₂ , C ₂ , B
Signal K ₂ is output sequentially a predetermined bit width (8bit) whenever each read operation.

Reference numeral 110 denotes a main scanning magnification circuit, which performs enlargement / reduction processing of the image signal and the black character determination signal in the main scanning direction by a conventionally known interpolation operation.

Reference numeral 111 denotes a spatial filter processing unit which switches between edge enhancement and smoothing processing based on a 2-bit filter signal, as will be described in detail later.

The M ₄ , C ₄ , Y ₄ ,
The BK ₄ plane-sequential image signal and the SEN signal which is a 200-line / 400-line switching signal are sent to the laser driver,
Density recording is performed by PWM in the printer unit.

Reference numeral 113 denotes a black character determination unit which detects a character portion in the input image and outputs a UCR amount control signal ucr, an output filter control signal filter, and a laser recording line number switching signal sen.

FIG. 8 shows the timing of each control signal.

The VSYNC signal is an image effective section signal in the sub-scanning direction. In the section "1", image reading (scanning) is sequentially performed (M), (C), (Y), (B).
k) forming the output signal. VE is an image effective section signal in the main scanning direction, which takes the timing of the main scanning start position in the section of "1" and is mainly used for line counting control of line delay. The CLOCK signal is a pixel synchronizing signal, transfers image data at the rising timing of 0 → 1, is supplied to each of the signal processing units 102 to 113, and is supplied to the laser driver 212 with the image signal, 200 lines / 40.
Used to transmit the 0 line switching signal.

Next, the operation of the image scanner in the focus adjustment mode will be described.

FIG. 9 is a diagram showing operations of the first mirror base 2001 and the second mirror base 2002 in the focus adjustment mode.

FIG. 10 is a flowchart showing the operation transition in the focus adjustment mode.

The operation of the focus adjustment will be described with reference to FIG. Step 1: The adjustment document 204 placed on the platen glass 203 is read into the sensor 210. Here, it is desirable to use the adjustment document 204 in which many thin lines are drawn in the sub-scanning direction. Step 2: Using the read data for one line, a difference value between adjacent pixels is calculated, and a square error is accumulated.

[0094]

(Equation 2) Step 3: After storing the value of Δdatam, the second mirror base 2002 is moved by one clock while the first mirror base 2001 is fixed.

M = m + 1 After repeating Steps 1 to 3 a sufficient number of times, Step 4: Find the maximum value Δdatamax of Δdatam. Step 5: Value md of m giving the maximum value of Δdatam
The optical path length x is determined from the value of atamax.

[0096] When the X ₀ and the optical path length when the m = 0, the optical path length after the fine adjustment becomes X = X ₀ -2mdatamax.

By controlling the second mirror base 2002 so as to maintain the optical path length X obtained by the above operation, it becomes possible to input an image with fine focus adjustment.

Here, FIG. 11 shows that in step 4,
It is a conceptual diagram which calculates | requires the maximum value of (DELTA) data. FIG. 12 is a diagram for obtaining the optical path length X.

In FIG. 12, A is the position of the linear motor 2071 when the optical path length is X ₀ , and B is mdat from A.
It shows the position of the linear motor 2071 when it has advanced by amax. When the linear motor 2051 is at the standard position when the linear motor 2051 is at the standard point, the most focused state is obtained.

Here, the focus adjustment mechanism is a linear motor 20 that drives the first mirror base 2001 and the second mirror base.
04, CCD 21 while controlling linear motor 2004
And arithmetic and control means for performing the above arithmetic processing on the image information read at 0 and calculating the optical path length.

The above-mentioned focus adjustment is executed by giving instructions as needed, such as in the image scanner assembling process or after component replacement.

Further, by automatically executing the focus adjustment after the power is turned on, even a small error in the optical path length due to environmental fluctuation or the like is constantly corrected, and a higher quality image can be input.

In this embodiment, a document on which a number of fine lines are drawn in the sub-scanning direction is used as a document for performing focus adjustment. However, if the value of .DELTA. The manuscript 204 may be any object.

Further, the method for performing the focus adjustment is not limited to the above-mentioned method, and any method may be used as long as an optimum optical path length is obtained as a result of the focus adjustment.

[0105]

As described above, according to the present invention, the optical path length from the document to the reading means can be changed by independently controlling the plurality of reflecting members for guiding the reflected light irradiated on the document to the reading means. Therefore, the step of finely adjusting the optical path length by finely adjusting the lens in the related art becomes unnecessary. Further, since the optical path length can be changed without disassembling the device, the optical path length can be easily adjusted even if it becomes necessary to adjust the optical path length again due to replacement of parts or the like.

Further, the apparatus has a first reflecting member and a second reflecting member for guiding the reflected light illuminating the original to the reading means. The first reflecting member is fixed and the second reflecting member is fixed. By providing a focus adjusting mechanism that adjusts the image forming state of the reading unit by changing the optical path length by moving a member, the first reflecting member can be fixed and the second reflecting member can be fixed without fine adjustment of the lens. Since the optical path length can be changed by performing the control for moving the reflecting member, the focus adjustment operation can be simplified. In addition, since the focus can be adjusted without disassembling the apparatus, even if it becomes necessary to adjust the focus again due to replacement of parts or the like, the focus can be easily adjusted. Further, by performing image input while maintaining the optical path length adjusted by the focus adjustment mechanism so as to obtain an optimal image forming state, high-quality image input becomes possible.

Further, by using a linear motor that does not require wires or the like as the motor for driving the reflection member, errors caused by using wires are eliminated, and a more accurate image input device can be realized. Become.

If the adjustment by the focus adjustment mechanism is executed when the power is turned on, the focus is adjusted each time the power is turned on, so that a highly accurate image can always be input.

Further, in an optical system moving type image input apparatus for scanning an original by moving an optical system, a plurality of reflecting members for guiding reflected light illuminating the original to reading means are independently controlled to allow the original to be scanned. If the focus adjustment mechanism of the image input device is configured to adjust the image forming state in the reading unit by changing the optical path length to the reading unit, the optical path length is changed by independently controlling the reflecting member. Therefore, the step of finely adjusting the optical path length by finely adjusting the lens in the related art becomes unnecessary, and the focus adjustment operation can be simplified. Also,
Since the focus can be adjusted without disassembling the device,
Even when the focus needs to be adjusted again due to replacement of parts or the like, the focus can be easily adjusted.

Further, the apparatus has a first reflecting member and a second reflecting member for guiding the reflected light illuminating the original to the reading means, and fixes the first reflecting member to the second reflecting member. If the image forming state of the reading unit is adjusted by moving the member to change the optical path length, the optical path can be controlled by fixing the first reflecting member and moving the second reflecting member. Since the length can be changed, the focus adjustment operation can be simplified.

Further, if the image reading section for reading the original image of the image processing apparatus is provided with the image input device according to the present invention, and the predetermined processing is performed on the image information read by the image reading section, An image processing apparatus capable of inputting a document image with high accuracy can be provided.

Further, if the image reading section for reading the original image of the image forming apparatus is provided with the image input device according to the present invention, and the image read by the image reading section is formed on a recording material, high accuracy can be achieved. It is possible to provide an image forming apparatus capable of forming a high-quality image based on the original image input in step (1).

[Brief description of the drawings]

FIG. 1 is an external view of a copying machine according to an embodiment of the present invention.

FIG. 2 is a diagram for explaining an operation of the image scanner 201;

FIG. 3 is a configuration diagram of a CCD 210 used in the present embodiment.

FIG. 4 is an enlarged view of a light receiving element in the CCD 210.

FIG. 5 is a cross-sectional view of the CCD 210.

FIG. 6 is a diagram illustrating a control operation of density reproduction of the printer according to the embodiment.

FIG. 7 is a block diagram showing a flow of an image signal.

FIG. 8 is a diagram showing the timing of each control signal.

FIG. 9 is a diagram for explaining a focus adjustment operation of the image scanner unit.

FIG. 10 is a flowchart for explaining a focus adjustment operation of the image scanner unit.

FIG. 11 is a diagram for explaining an operation of determining a position of a second mirror base in a focus adjustment operation.

FIG. 12 is a conceptual diagram for obtaining a correction amount of an optical path length.

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 copier 200 printer unit 201 image scanner unit 206 first mirror 207 second mirror 209 image signal processing unit 210 line sensor 2004 linear motor

Claims (8)

[Claims] An optical system moving type image input apparatus for scanning an original by moving an optical system, wherein the original is controlled by independently controlling a plurality of reflecting members for guiding reflected light irradiated on the original to reading means. An image input device, wherein an optical path length from the scanning unit to the reading unit is variable. A first reflecting member and a second reflecting member for guiding the reflected light illuminating the document to the reading means, wherein the first reflecting member is fixed and the second reflecting member is fixed. 2. The image input apparatus according to claim 1, further comprising a focus adjustment mechanism that adjusts an image forming state of the reading unit by moving a member to change the optical path length. 3. The image input device according to claim 1, wherein the reflection member is driven by a linear motor. 4. The image input device according to claim 1, wherein the adjustment by the focus adjustment mechanism is performed when power is turned on. 5. An optical system moving type image input apparatus for scanning an original by moving an optical system, wherein a plurality of reflecting members for guiding reflected light illuminating the original to reading means are independently controlled, and A focus adjustment mechanism for an image input apparatus, wherein an image forming state of the reading unit is adjusted by changing an optical path length to the reading unit. 6. A first reflection member and a second reflection member for guiding reflected light illuminating the document to the reading means, wherein the first reflection member is fixed and the second reflection member is fixed. 6. The imaging state of the reading unit is adjusted by moving a member to change the optical path length.
A focus adjustment mechanism of the image input device described in the above. 7. An image reading apparatus for reading a document image, comprising: the image input device according to claim 1; and performing a predetermined process on the image information read by the image reading section. Processing equipment. 8. An image forming apparatus, comprising: an image reading unit for reading a document image, comprising the image input device according to claim 1; and forming an image read by the image reading unit on a recording material. .