JP2694636B2 - Image input device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image input device, and more particularly to an image input device.
It is related to the improvement of the setting at the time of reset. [0002] 2. Description of the Related Art FIGS. 14 and 15 show a conventional image input device.
The whole perspective view and front view of an example are shown. Image input in the example
The device is a mounting table for mounting the image 1a to be read.
1. A turtle having a photoelectric conversion unit for reading the image 1a
LA (imaging unit) 2 and a supporting member for supporting the camera 2.
S, so that the mounting table 1 and the supporting member S cannot be separated from each other.
It is configured as one. The supporting members S are vertical supporting portions.
4 and a horizontal support portion 3, and the camera 2 includes a vertical portion.
In the vertical direction (Z direction) of the material 4, the horizontal support portion 3
And can be moved in the front-back direction (X direction). M
Is a monitor display, 7 is a power switch, W is a white rose
Knobs for lighting 5 are respective lights for illuminating the mounting table 1.
Device. The focusing and zooming of the camera 2
Switching and inversion / non-inversion switching of video output are performed manually.
I was [0005] [Problems to be Solved by the Invention]
In the conventional example of, as described above, focusing /
Since manual operations such as zooming were performed, each method was re-installed.
When setting and starting the operation of the image input device, the device
It is still in the previous manual operating state, which is why
It is necessary to focus / zoom etc.
It was bothersome and the operability was poor. The present invention has arrived at the problems of the conventional examples as described above.
This is an image with good operability at reset.
It is intended to provide an image input device. [0007] Therefore, according to the present invention,
(1) The platen of the image to be read and this platen
A lighting unit for illuminating the
Optical system and the image obtained through this optical system
Imaging unit for photoelectrically converting an optical image, and a support for the imaging unit
And the imaging magnification state from the tele end to the wide end
Adjustable imaging magnification in each of several steps
Image input including a mechanism and an exposure adjustment mechanism having a diaphragm
The image input device during operation of the device,
At least the reset of the imaging magnification adjustment mechanism and the exposure adjustment mechanism
The throttle is opened to a specified target value when
After operating the exposure adjustment mechanism to release
A control means for operating the magnification adjusting mechanism at the wide end is provided.
As a result, (2) the original plate of the image to be read
And an illumination unit for illuminating the platen, and
An optical system for obtaining an optical image and the optical system
And an image pickup unit for photoelectrically converting the optical image of the captured image.
Change the support of the image section and the magnification ratio from the telephoto end to the wide end.
Can be set in each of the predetermined multiple steps in
Image input with imaging magnification adjustment mechanism and focus adjustment mechanism
The image input device during operation of the device,
At least the reset of the imaging magnification adjustment mechanism and the focus adjustment mechanism
The optical system is moved a predetermined amount when
Before setting the imaging distance to focus on the document table.
After operating the focus adjustment mechanism, the imaging magnification adjustment mechanism
Is provided with a control means for operating the wide end.
By doing so, the above-mentioned object is achieved. [0008] [Operation] With the above configuration, operability at reset
Is remarkably improved, and it is necessary to use the settings at the time of conventional reset.
Costs are reduced because the required switches are unnecessary.
Can contribute. [0009] EXAMPLES The present invention will be described below based on examples.
You. 1 and 2 show an image input device according to the present invention.
Shows the overall perspective view and cross-sectional side view, respectively, of the embodiment,
The same as in FIG. 14 and FIG. 15 showing the conventional example (phase
The components are represented by the same reference numerals. (Structure) In FIGS. 1 and 2, 1 is a reading
This is a mounting table on which the captured image 1a is mounted. Here below
A color photoelectric conversion unit for reading images such as originals
In order to adjust the white balance of camera 2,
The surface of the table 1 on the camera 2 side is achromatic gray.
Although the surface of the mounting table 1 on the camera 2 side may be white,
If the amount of light incident on the photoelectric conversion part in the laser 2 is too large, the photoelectric conversion
The output of the conversion unit is saturated and the white balance can be adjusted properly.
Than white to prevent
Also, a gray color having a low reflectance is preferable. Also, is the mounting table 1
Mount table 1 so that diffused reflected light does not enter the camera 2.
It is used as a diffuse reflector. 2 is fixedly / supported to the horizontal support portion 3.
The camera has a color photoelectric conversion unit. 4 is vertical
The support part is fixed to the mounting table 1, and the horizontal support part 3 is vertical.
It is connected to the mounting table 1 via the support portion 4. 5,5
Are lighting devices arranged on both upper sides of the mounting table 1.
If the table 1 is dark, or if it is written on
When you want to input to the camera 2, specular reflection from the interior light
Use a shade etc. to prevent the camera 2 from picking up
It is used when used and is turned on / off by switch 6.
obtain. Reference numeral 7 is a power switch of this apparatus. Reference numeral 8 is for inputting a video signal from the outside.
External input terminal, and the external input input to this is
It is output from the monitor output terminal 9. 10 is remote control
Operation device (hereinafter abbreviated as remote control)
The image on the stand 1 is formed on the camera 2 with the zoom lens.
Focusing with built-in zoom lens for zooming
For electrically operating each operating member such as ming
In the example shown in the figure, the cord is connected to the main unit.
Of course, the earless type is also acceptable. FIG. 3 shows a cross-sectional explanatory view of the camera 2. 1
1 is a CCD (charge coupled device) as an image sensor,
Mounting table through lens 12 and focus lens 13
1. Input the image 1a on 1. The zoom lens 12 moves
It is fixed to the cylinder 21, and the motor is connected via the cam cylinder 19.
Driven by 15. The focus lens 13 has a focus frame 2
0 is attached to the moving cylinder 22 and is fixed to the cam cylinder.
It is driven by the motor 16 via 19. 14 is a diaphragm
Then, the motor 17 opens and closes. 18 is a fixed cylinder
Is fixed to the horizontal support portion 3, and the movable barrels 21, 22 and the cam
A cylinder 19 is rotatably attached. Next, FIG. 4 shows the operation section of the remote controller 10.
The side view is shown. 23 is a rotation for focus / zoom adjustment
Is a type dial, and 24 is a control switch for the dial 23.
Switch to select either focus / zoom position
(The focus is shown in the figure). 25 is Airi
Press the + (+) button to open the aperture,
Press to activate the diaphragm. Also, auto
Pressing the iris button 26 automatically adjusts the aperture.
Adjustment is possible. 27 is an external input switching button, which is an external input terminal.
Button to select the input from child 8 (Fig. 2), 2
Reference numeral 8 is a negative / positive switching button. 29 is the camera 2
It is a white adjustment button.
Can automatically adjust the white balance. Also,
White balance adjustment by pressing this button
Depending on the type of external light, fluorescent lamp, daylight, incandescent lamp light, etc.
However, it does not matter if they are manually selected. Ma
Reference numeral 30 is a reset button described later. (Electrical Circuit) FIG. 5 shows the electrical circuit of this embodiment.
The figure is shown. In the figure, reference numeral 101 denotes an image of the subject Y.
The camera head. X is in front of the camera head 101
Mounted on the image sensor CCD in the head
This is a lens for forming the Y image,
Optical lens 102, aperture 103, zoom adjustment motor 1
04, motor 105 for focus adjustment (focusing),
It is composed of a diaphragm adjusting motor 106. Here, each motor 104, 105, 106
Is a DC motor, step motor, ultrasonic motor, etc.
An element that can convert air energy into mechanical energy
In response to a command from the controller 112, which will be described later,
It is possible to mechanically move in opposite directions, and movement in both directions is possible.
Motor 104, the "tele" / "wide",
The motor 105 is focused “near” / “far”, and the motor 106 is stopped down.
“Open” / “Close” operation, zoom and pin respectively
Allows adjustment of focus (focus) and aperture (exposure amount)
I have. Here, in order to simplify the explanation,
All of the motors 104, 105, 106 are step motors.
Shall be. The image information of the subject Y is obtained by the camera head 101.
From the NTSC or other video signal via the output line 107.
It is output as a number. The camera head 101 is the same as that.
Sometimes, to detect the average brightness of the subject Y,
The output luminance signal is integrated through a line 108 into an integrating circuit.
109, the signal from the terminal d of the camera head 101 is received.
According to No.
After A / D conversion by the D converter 111, this system
Input to the controller 112, which is the control device for the entire system
I do. The camera head 101 is connected from the terminal c.
A synchronization signal is sent to the integrating circuit 109 to reset the integrated waveform.
Control timing from terminal c
A timing pulse is sent to the laser 112 and the integrated waveform is
The timing to take in the controller 112 is designated. The controller 112 includes the following operation members.
Is connected. That is, 113 is a rotary enco
And the two outputs A and B are the controller 11
2 is connected to the output of the rotary encoder 113 in FIG.
As shown in the signal waveform diagram, rotate the encoder 113 clockwise.
When [0022] (Equation 1) Since it is designed to change as
The controller 112 is provided by the rotary encoder 113.
The rotation direction can be determined by input. Next, 114, 115 and 116 are
With members that specify zoom, focus, and aperture operations,
Yes, for example, the input from these goes high.
Controller 112, the operation is designated
I judge that it was. 118/119 is an up / down operation unit
When the material reaches the “high” level,
The roller 112 opens (closes up) / closes (down) the diaphragm 103.
Operation). For the rotation of the rotary encoder 113,
Again, the controller 112 rotates right / left respectively
In contrast, the zoom operation is tele / wide, and the focus operation is
Is near / far, and aperture is open / close. 120 is
It is a reset switch described later. The configuration of each of the above operating members is, for example,
112-120 may take the form of remote controls.
However, it does not matter if it is incorporated in the main body. (Operation) The operation of this embodiment having the above configuration
Will be described with reference to FIGS. 7 to 9. First, the aperture control will be described. FIG.
Is an explanatory diagram of the metering area for the screen.
An example will be described in which light is metered with uniform weighting.
, (T₁ ~ T_Two ) Is the photometric portion, and in FIG. 8 and FIG.
Timing wave of each signal related to aperture control corresponding to each time point
Show the shape. FIG. 8A shows the terminals of the camera head 101.
A vertical synchronizing signal output from c to the integrator circuit 109 in FIG.
(B) is an integrated output waveform of the integrating circuit 109, FIG.
Is the controller 11 from the terminal d of the camera head 101.
2 is a timing pulse output. As shown in FIG. 7B, the integrated output is vertical.
It is cleared at the front of the sync signal, and the photometric part (t₁ ~ T_Two )
However, after that, until the next sync signal is input.
Is a constant value. Therefore, at this constant value,
Time t in the middle_Three Timing pulse input at
Take in the controller 112 at the timing of ((c) figure)
Light intensity measurement result ((b) diagram, integrated value V_A ) According to
Adjust 103. This operation sequence is shown in FIG.
The adjustment operation sequence flowchart will be described. First, in step 201, the controller
The controller 112 determines whether or not the timing signal is input.
I do. If you have not entered (N), skip to another routine.
If it is input (Y), A / D converter 1
Integral value V via 10_A (Step 20
2). Next, this value V_A Is the maximum allowable value V_R1Compare with
(Step 203). Where V_A > V_R1If
(Y), it is determined that the amount of incident light is excessive, and the motor 10
The aperture 103 is narrowed down one step via 6 (step
204). With the above, the operation in this case is completed and the next work is performed.
Move (step 208). In step 203, if V_A <V
_R1If (N), then V_A Allowable value is the minimum value V_R2When
The comparison is made (step 205). Where V_A <V_R2That
(Y), it is determined that the amount of incident light is insufficient, and the motor 1
The aperture 103 is opened one step via 06 (step
206). This completes the operation in this case, and the next work
(Step 208). If, in step 205, V_A >
V_R2If (N), it is determined that the amount of incident light is appropriate.
Then, the aperture 103 is left as it is (step 20
7) End the operation in this case and move to the next work (step
Step 208). Here, the integrated value V_A Maximum of
Minimum allowable value V_R1/ V_R2Is the target value V of the integrated light amount_R Against
For example, V_R1= 1.4V_R , V_R2= 0.7V_R No
To decide. When correcting this, for example, 2^0.5
As shown in Table 1, the aperture correction is performed in steps.
Tabulate the target value of the control and refer to it.
What should I do? That is, in this case, 5 is the standard value
Therefore, the smaller the number, the lower the target amount of incident light.
You. [0037] [Table 1](Operating Operation) Next, the control device of the present embodiment will be described.
Describe the specific operation: 1) Direction of operation with the rotary encoder 113 FIG. 10 shows a four-dimensional display operated by the rotary encoder 113.
Cass / Zoom / Aperture control operation sequence flow chart
Show However, in this case, the up / down operation member
118/119 is not used. First, in step 301, the controller
The encoder 112 reads the output of the rotary encoder 113.
Put in. Then compare that value with the last read value (step
302). If both values are equal (Y), then
Since the total encoder 113 is not operated, the operation
Ends (step 303). Both in step 302
If the values of N are different (N), it is explained in FIG.
In this way, the right / left of the rotation direction is determined (step 30
4) and then the variable of the rotary encoder 113 (next
Update (for comparison when reading twice) (step 30)
5). Here, for convenience of explanation, the rightward rotation is performed.
Assume that Next, zoom / focus / diaphragm respectively
Control the state of the operation designation member 114/115/116 of
Read on the roller 112 and decide what to operate
(Step 307). For example, if the zoom operation 114 is performed,
If so, in step 308, the motor 1
Drive 04 to the 2 step "tele" side, and if the focus
If the operation 115 is performed, the motor 105
Drive to the "near" side of the step, or if the squeeze operation
If 116 is set, the photometric target is set in Table 1 above.
And two values above the current value in (with a smaller No.)
(Step 308). Also, how to rotate the rotary encoder 113
If the direction is opposite, the operation in step 308
You can reverse the direction. 2) Operation at power-on At least zoom, focus, and diaphragm operating range
You can check the current position by installing a switch at one point.
If this check is not performed, for example,
If the amount of light is insufficient even if the diaphragm is fully opened,
Continue to continuously drive the motor 106 in the direction to open the diaphragm.
Useless power consumption, heat generation or
There is a fear of causing obstacles such as short circuits of life.
To prevent this, the following initial operation is performed. Initial operation of diaphragm FIG. 11 shows a flowchart of the initial operation sequence of the diaphragm.
Show. After opening the diaphragm 103, the diaphragm is stopped up to the minimum diaphragm.
The motor 106 to N_I Just step down
First, in steps 501 to 503,
Unconditionally N_I Step down. With this, the aperture 103 is maximum
It is in a small aperture. Next, up to the most frequently occurring aperture value
Is the minimum aperture N_I1Assumed to be steps apart
Then, in steps 505 to 508, unconditional
N_I1Open the step aperture. Then, the standard target value
(Equivalent to NR = 5 where No at the left end in Table 1 is NR)
To control the exposure to (step 509). Here, in steps 505 to 508
When the operation is performed, the expected value N from the minimum aperture₁₁Step open
Work in screen units (60 fields / s
(16.6 ms) with a delay of
The response time of the motor 106 can be shortened to the full. Initial zoom operation The initial zoom activation is typically used at the "wide" end, for example.
When it is often used, from the "tele" end to the "wide" end
N_Z Assuming that you can move in steps, unconditionally N_Z Stay
Drive to the "wide" side. Operation system in this case
The sequence chart is based on the steps in Fig. 11.
The illustration is omitted because it is exactly the same as that of the pages 501 to 504.
You. Initial focus operation For focus, it is usually possible to focus on the platen glass 1.
Since this is always the case, this position is set as the initial position. That is,
Focus is N from close range to infinity (∞)_F Step
Assuming that the motor 105 has_F S
Activate the step and set to ∞. Then, from ∞ to the initial position
To make N_F0Assuming it takes steps,
The motor 105 to N_F0If step operation is performed, it will be in the initial position
Can be focused. Flow chart in this case
Also, since it follows the steps 501 to 508 in FIG. 11,
Illustration is omitted. 3) Reset operation When operating the system of this embodiment, for example, exposure compensation
If you want to change this back to the standard during
You can restore the original by operating the same number of times.
In case of, it is easier to return with one touch.
Therefore, here, the 120 reset switch in FIG. 5 is used.
I try to do it. FIG. 12 shows the reset operation sequence flow.
The chart is shown. First, in step 601,
The roller 112 is operated by the reset switch 120.
It is determined whether or not there is. If not operated (N),
The work is completed (step 606), and if the reset switch
If the switch 120 has been operated (Y), the aperture 103
Is currently in a reset state (ie, in Table 1
It is determined whether or not the standard target NR = 5 is controlled.
(Step 602). If not (N),
At 603, the aperture is reset and the work is completed.
(Step 606). In step 602, the aperture is reset.
If it is in the set state (Y), the zoom 102 is now
Determining whether or not it is in the set state (eg "wide" end)
(Step 604). If in reset
(Y), the work is finished (step 606). Against this
If it is not in the reset state (N), the current zoom value and
The motor 104 is "wide" by the difference from the "wide" end
Drive to the side to reset the zoom (step 605),
The work is finished (step 606). Here, as described above, the aperture and the gap are adjusted.
To give priority to the game, and press once to squeeze, then
When I operate it, I reset it in the order of zoom.
All resets should be done in one reset operation
Is also good. In this case, as the next operation of step 603,
Step 604 may be performed. Further, the above is a reset and the aperture and the gap.
But only reset focus (for example,
It is also possible to stop at a certain specific distance)
It is thick, and in that case, with three operations, for example
It may be reset in the order of scan, aperture, zoom,
First reset focus, aperture, then zoom.
You may. Or reset everything in one operation
It doesn't matter if you do this. Further, the zoom is specially reset.
Along with the buttons, several reset positions
You may choose to turn it off. That is, at standard distance
A3, B4, A4, B5, A5, B6, etc. size
It is provided so that at one zoom reset
Try to reset to one of them, eg A4, then
Reset switch 120 and up / down operation member 11
If you operate 8/119 at the same time, it will be up every time.
If it is down, → B5 → A5 → ……, and if it is down ………… B
It is possible to enlarge / reduce like 4 → A3.
Wear. From the beginning of the non-reset state, the
Set switch 120 and up / down operation member 118
If you operate / 119 at the same time,
You may reset to the nearest reset position,
Only simple reset operation by the reset switch 120
Reset to the nearest reset position with
No. 4) Operation of the whole system Next, the operation of the entire system including the audio system
The controller 112 will be described as an operation member.
A new selection member 13 for audio operation selection
0 (audio select) and each input selection member 13
1, 132, 133 are added. Also, Audi
As a dedicated circuit, microphone 701, audio times
Path (amplifier, automatic level control, etc.) 702, electronic volume
703, prohibit switch 705, switcher 706, etc.
Has been added. Of these, the electronic volume 703 is a computer.
The volume control digital signal from the tracker 112 is analyzed.
Depending on the voltage of the D / A converter 704 that converts the
It is an amplifier with variable gain. Also, the prohibit switch 70
5: Audio system occurs in transient state when power is turned on
Switch to prohibit the output of
You. Each switcher 706, 706 'has a control terminal.
Three inputs by digital signals added to a and b
One of c, d, and e is output to the output terminal f. example
If a b High high cf conduction High-low df conduction Low high ef conduction Of internal input or external input
You can select one. FIG. 13 shows the electric power of the entire system including the audio system.
Flowchart of operation sequence when power is turned on: Power supply
When is turned on, first, in step 801, noise suppression is performed.
To stop, turn off the prohibit switch 705 and
The itcher 706 causes an internal signal to be output.
(Step 802). The control terminal of prohibit switch 705
Be configured to turn off when at "high" level
Normally, the controller 112 resets when the power is turned on.
All output terminals (open collector or
Is often configured to turn off the open train)
Automatically by simply attaching a pull-up resistor.
801, 802 are performed. Next, in step 803, the volume control is performed.
The digital signal of your
Initialize to a value that Next, aperture, focus, zoom
Initialization in the order of the system (each step 804, 805, 80
6) After that, the prohibition of the prohibition switch 705 is released.
(Step 807). If the audio system makes noise
If the transition time that can occur is shorter, for example, step 80
The prohibition may be canceled in the middle of 4. Next, the audio in the steady state is included.
The input switching is performed by each input selection member.
Other operating members by operating 131 to 133
It is completely independent of the operation of. The volume adjustment is performed by audio select 1
In the state of 30, the up / down operation member 11
This is done by performing the operation of 8/119. 5) Initial operation of negative / positive inversion When the power is turned on, it is usually used positively, so
Set to positive. That is, the output of the camera head 101
Input to the terminal C of the switcher 706 'as it is.
No. Normally, the negative / positive changeover switch 28 is pressed.
And the operation of the controller 112 is the camera head 101.
Is input to the camera head 101 through line c of
The output of the head is inverted and applied to the terminal C of the switcher 706 '.
Is entered. 6) Initial operation of video output When the power is turned on, the output of the camera head 101 is normally displayed.
In response, the controller 112 causes the switcher 70 to
Input line of switcher as input of 6,706 '
Select input terminal C, that is, internal input, through a and b
And output. In the normal state, the external input switching button 27
Any of the (input selection members 131 to 133) is selected.
If so, the controller 112 responds to the input with a switch.
Switcher input through itcher input lines a and b
Select either c, d, or e. For reset including audio,
As the target to be set, the input switching and volume
Be added. For the priority of reset, input switching
Place it first, then aperture focus, zoom, then volume.
Alternatively, only the input selector should be set to the top, and all others should be
You may do it all at once. (Operation / Effect of Embodiment) The above is a detailed description.
As described above, in this embodiment, when the power is turned on, the automatic
Focus / Zoom is, for example, at the A4 size position.
It matches the fixed position, the microphone output is appropriate, and
For positive mode, internal input and operability
Was significantly improved. At the same time, reliable operation after that
Improved, eliminating the need for switches etc. for initial setting
Therefore, it can also contribute to cost reduction. [0067] As is apparent from the above description, the present invention
According to the first aspect of the invention, when the image input device is in operation,
Reset the imaging magnification adjustment mechanism and exposure adjustment mechanism without
, The aperture will be opened to the specified target value.
After operating the exposure adjustment mechanism, adjust the imaging magnification
It has a control means to move the mechanism to the wide end
Then, the imaging magnification adjustment mechanism operates with proper exposure.
The image output from this image input device to an external display device.
Even when displaying an image, the person who sees the display feels strange.
Never give. According to the second invention of the present application, image input
During operation of the apparatus, at least the imaging magnification adjusting machine
When the reset of the structure and the focus adjustment mechanism is instructed,
Move the optical system by a predetermined amount to focus on the platen.
The focus adjustment mechanism was operated to set the imaging distance to
After that, control for operating the imaging magnification adjustment mechanism at the wide end
Since it is equipped with a means, the imaging magnification adjustment machine in the focused state
Since the structure works, this image input device can be connected to an external display device.
Even when displaying the image output from
The viewer will not feel discomfort.

BRIEF DESCRIPTION OF THE DRAWINGS [FIG. 1] Overall perspective view [FIG. 2] Cross-sectional side view of FIG. 1 [FIG. 3] Cross-sectional view of camera [FIG. 4] Operation part top view of remote control device [FIG. 5] Electric circuit diagram [Fig. 6] Rotary encoder output signal waveform diagram [Fig. 7] Photometric area diagram for screen [Fig. 8] Timing waveform diagram of aperture control related signal [Fig. 9] Aperture adjustment operation sequence flowchart [Fig. 10] Rotary encoder operation sequence flowchart FIG. 11: Initial aperture operation sequence flowchart [FIG. 12] Reset operation sequence flowchart [FIG. 13] Operation sequence flowchart when the power of the entire system is turned on [FIG. 14] Perspective view of an example of a conventional image input device [FIG. 15] Conventional Front view of an example of an image input device of [Description of symbols] 1 Mounting table 1a Image 2 Camera (imaging unit) 3 Horizontal support 4 Vertical support 7 Power switch 8 Input terminal 10 Remote control device 12 Zoom lens (shooting magnification adjusting mechanism) 13 Focus lens (shooting distance adjusting mechanism) 14 Aperture (exposure adjusting mechanism) 28 Negative / Positive switching button (shooting output inversion / non-inversion selection mechanism) ) 30 reset button 112 controller (control means) 703 electronic volume (audio output adjustment mechanism)

Claims (1)

(57) [Claims] A platen of an image to be read, an illumination unit for illuminating the platen, an optical system for obtaining an optical image of the image, and an optical image of the image obtained through the optical system are photoelectrically converted. An image pickup section, a support for the image pickup section, an image pickup magnification adjusting mechanism capable of setting an image pickup magnification state in each of a plurality of predetermined steps from the telephoto end to the wide end, and an exposure adjusting mechanism having a diaphragm. An image input device, wherein during the operation of the image input device, the exposure is performed so as to open the diaphragm to a predetermined target value at least when a reset command is issued to the imaging magnification adjustment mechanism and the exposure adjustment mechanism. An image input apparatus comprising: a control unit that operates the imaging magnification adjusting mechanism to a wide end after operating the adjusting mechanism. 2. A platen of an image to be read, an illumination unit for illuminating the platen, an optical system for obtaining an optical image of the image, and an optical image of the image obtained through the optical system are photoelectrically converted. An image input device including an image pickup unit, a support for the image pickup unit, an image pickup magnification adjusting mechanism that can set an image pickup magnification state in each of a plurality of predetermined steps from a telephoto end to a wide end, and a focus adjustment mechanism. While the image input device is in operation, at least when a command to reset the imaging magnification adjustment mechanism and the focus adjustment mechanism is issued, the optical system is moved by a predetermined amount to move the optical system to the document table. An image input apparatus comprising: a control unit that operates the imaging magnification adjusting mechanism to a wide end after operating the focus adjusting mechanism to set an imaging distance for focusing.