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Description  |
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FIELD OF THE INVENTION
The present invention relates to an image reading apparatus employed in a
copying machine, an image scanner or others, and in particular to an image
reading apparatus which uses a fluorescent lamp as a lighting device for
optically scanning an original image, and/or is provided with a liquid
crystal display (LCD) for displaying various kinds of information.
Also, the invention relates to a linear motor for driving, e.g., a
reciprocatable slider which carries an optical part in an image reading
apparatus, and in particular to a shaft-type linear motor which includes a
stator in a shaft form having a field magnet extending in a constant
direction, and also includes a movable piece having an armature coil
fitted around the field magnet for reciprocation along the stator.
BACKGROUND OF THE INVENTION
Image reading apparatuses for optically scanning an original image have
been broadly used, for example, in copying machines and have also been
used as image scanners coupled with computers or the like.
The image reading apparatus generally includes first and second sliders.
The first slider is reciprocatable and carries a lighting device for
lighting an original document laid at a predetermined position and a
reflection mirror for leading the image light beams reflected by the
original document in a predetermined direction. The second slider carries
reflection mirrors for leading the image light beams coming from the
reflection mirror on the first slider in a predetermined direction, and
can reciprocate in the same direction as the first slider.
As the lighting device carried on the first slider, a fluorescent lamp is
generally used. The power circuit or driving circuit for the fluorescent
lamp is generally arranged at a deep position (i.e., rear position) in the
apparatus. One of the reasons for this arrangement is as follows. A
sufficient space is left at the rear position in the apparatus, and an
inlet of AC power supply of the apparatus is also located at the rear
position in the apparatus in many cases. Therefore, the circuit located at
the rear position does not require complicated wiring.
The image reading apparatus such as an image scanner and a copying machine
equipped with the image reading apparatus are generally provided with an
operation panel having key switches and a display or the like for
displaying various kinds of information. A LCD is now used as this display
in many cases, and the operation panel is usually arranged at the front
side of the apparatus for easy operation by operators.
In the above image reading apparatus, and particularly in the image reading
apparatus, for example, equipped with the foregoing two sliders carrying
the optical devices or parts, an image on an original document laid at a
predetermined position (e.g., on an original document table glass) is read
in such a manner that a lighting device carried on the first slider is
turned on, the first slider is driven at a predetermined speed in the
predetermined direction parallel with the original document, and
concurrently the second slider is driven in the same direction as the
first slider at half the speed of the first slider. Thereby, the original
document is scanned entirely and optically. During this scanning, light
beams, which are issued from the lighting device and are reflected by the
original image, are lead in the predetermined direction by the mirrors on
the first and second sliders. An image sensor such as a CCD is arranged at
a position to which the image light beams are led by the mirrors. The
image sensor can read the original image. Alternatively, if the image
reading apparatus is arranged, for example, in an analog copying machine,
the original image light beams led by the above mirrors are led by another
mirror or the like, if necessary, to a photosensitive member for forming
an electrostatic latent image corresponding to the original image.
As described above, the optical parts for optically scanning and reading
the original image are carried on the sliders, and, for example, linear
motors may be used for linearly reciprocating the sliders.
The linear motors can be classified into various types such as a linear DC
motor, a linear pulse motor and a linear induction motor, which have
distinctive features suitable to use in various kinds of equipments for
linearly moving objects, respectively.
For example, in linear induction motor taught by U.S. Pat. No. 4,512,385,
an armature coil group formed of a plurality of armature coils is fitted
around a shaft member provided with a field magnet. The shaft member forms
a movable piece, and the armature coil group forms a stator. In this
linear induction motor, the armature coil group of the stator is covered
and protected by a cylindrical cover.
FIG. 25 is a schematic side view of an example of a linear motor. This
linear motor has a field magnet 911' in a shaft-like form on which
magnetic poles of N- and S-types are arranged linearly and alternately to
each other, and an armature coil 921' fitted around the field magnet 911'.
The armature coil 921' is carried at an inner periphery of a yoke 922'
made of a ferromagnetic material in a hollow cylindrical form. Slide
bearings 923' fitted around the field magnet 911' are arranged at opposite
open ends of the yoke 922', so that the armature coil 921' and the yoke
922' can smoothly move along the field magnet 911'. In this linear motor,
the field magnet 911' functions as a stator 91', and the coil 921' and
yoke 922' function as a movable piece 92' reciprocatable along the stator
91'. When the armature coil 921' is energized, the movable piece 92'
generates a driving force and moves along the stator 91' owing to an
interaction with respect to a magnetic field produced by the field magnet
911'. Owing to provision of the yoke 922' made of a ferromagnetic
material, the magnetic field, which is produced by the field magnet 911'
at the position opposed to the yoke 922', is liable to form a magnetic
loop through the yoke 922', so that the intensity of the magnetic field
acting on the armature coil 921' inside the yoke 922' is larger than that
in the case where the yoke is not employed. Therefore, the linear motor
can generate a larger driving force. Thus, owing to the yoke 922', the
magnetic field formed by the field magnet 911' can efficiently act on the
coil 921'.
In the linear motor of the foregoing type which includes the shaft-like
stator having the field magnet extending in the predetermined direction
and the movable piece having the armature coil fitted around the field
magnet, the shaft-like stator itself can be utilized also as a guide
member for the movable piece, so that the structure can be simplified. For
this and other reasons, the linear motors of the above type have been
broadly used for linearly moving objects in fields of office automation
equipments such as a copying machine, a printer and an image scanner as
well as factory automation equipments such as an X-Y table and an object
transporting device, and optical equipments such as a camera.
The linear motor described above usually includes a linear encoder for
detecting a position of the movable piece or the like. Likewise, the image
reading apparatus provided with the reciprocatable slider usually includes
a linear encoder for detecting a position of each slider or the like. The
encoder may be utilized for controlling a position and/or a speed in
addition to detection of the position of a moving object such as the
movable piece or sliders. An optical type and a magnetic type of the
linear encoder have been known. For example, the magnetic encoder is
generally provided with a magnetic encoder scale having S- and N-type
magnetic poles arranged alternately with a fine pitch, and a magnetism
detecting element (e.g., an MR element which is a magnetoelectric
resistance element) for detecting the magnetic field formed by the encoder
scale. The encoder scale is stationarily arranged parallel to the moving
direction of the movable object such as the movable piece or the slider.
The magnetism detecting element is opposed to the encoder scale, and is
disposed on the movable object for movement together with the movable
object. The magnetism detecting element is usually used together with an
amplifier circuit for amplifying an extremely weak detection signal of the
magnetism detecting element, and a detecting circuit including a circuit
or the like for digitizing the signal.
However, in the case where the foregoing magnetic encoder is used as a
linear encoder for detecting a position of the movable object such as the
movable piece or the slider, the magnetism detection element (e.g., MR
element) and the detection circuit are liable to be affected by noises,
because it processes extremely weak signals and analog signals. In the
foregoing image reading apparatus, noise sources of the noises may be the
fluorescent lamp turn-on circuit and the LCD. If the fluorescent lamp
and/or the LCD are arranged near the magnetism detecting element and/or
the detection circuit, these element and circuit may be affected by
noises, and therefore a problem may arise in the position detection. When
a problem arises in position detection, image reading can not be precisely
performed, and the slider may run away out of control or collide with
another member. A similar problem may occur in the linear motor provided
with the magnetic encoder. When a magnetic field is present near the
linear motor, the magnetic field may cause problems in position detection
by the magnetism detecting element and/or the detecting circuit.
In addition to the foregoing, in the linear induction motor taught by U. S.
Pat. No. 4,562,385, although the stator, i.e., armature coil group is
protected by the cylindrical cover, a protection cover is not provided for
the movable shaft member. Therefore the motor suffers from such a problem
that dust or the like may adhere onto the shaft member and thereby may
impede sliding on the stator.
A similar problem may arise even in a shaft-type linear motor, in which a
shaft member provided with a field magnet forms a stator and a member
having an armature coil and fitted around the stator forms a movable piece
in contrast to the above linear induction motor.
For example, in the linear motor shown in FIG. 25, dust or the like may
adhere onto the stator 91' in a shaft form, in which case a sliding
resistance varies during sliding of the movable piece 92' along the stator
91', and the movable piece 92' cannot smoothly move along the stator 91'.
The linear motor shown in FIG. 25 also suffers from another problem. When
the movable piece 92' moves relatively to the stator 91', a load varies
due to variation in a magnetic attractive force which is exerted by the
field magnet 911' acting on the end of the yoke 922' of the movable piece
92' so that cogging of the movable piece 92' occurs, and thus smooth
movement of the movable piece 92' is prevented.
SUMMARY OF THE INVENTION
Accordingly, the invention aims to provide an image reading apparatus
including one or more sliders which carry optical parts and can linearly
reciprocate in a predetermined direction for optically scanning and
thereby reading an image on an original document located at a
predetermined position, and particularly an image reading apparatus
provided with position detecting means such as a magnetic encoder for
detecting positions of the sliders. More specifically, the invention has
the following objects.
An object of the invention is to provide an image reading apparatus of the
above mentioned type, in which a lighting device is carried on one of the
sliders for lighting an original document, and a power circuit of the
lighting device may generate noises such as high frequency noises, and
particularly an image reading apparatus, which can suppress an influence
exerted by the noises on detection of the slider positions, by the
position detecting means to a substantially allowed level, and thereby can
perform good image reading, and also, in which run-away out of control and
collision of the sliders can be suppressed to a higher extent.
Another object of the invention is to provide an image reading apparatus of
the above mentioned type, in which an LCD is employed for displaying
various kinds of information, and the LCD may generate noises such as high
frequency noises, and particularly an image reading apparatus, which can
suppress an influence exerted by the noises on detection of the slider
positions by the position detecting means to a substantially allowed
level, and thereby can perform good image reading, and also, in which
run-away out of control and collision of the sliders can be suppressed to
a higher extent.
The invention also aims to provide a linear motor of a shaft type, which
can be used for driving, e.g., a reciprocatable slider carrying an optical
part in the above image reading apparatus, and includes a stator in a
rod-like form having a field magnet provided with N- and S-type magnetic
poles arranged alternately, and a movable piece having an armature coil
fitted around the stator and being reciprocatable along the stator, and
more specifically aims to achieve the following objects.
Thus, still another object of the invention is to provide a linear motor,
in which position detecting means such as a magnetic encoder is provided
for detecting a position of a movable piece, and noises externally applied
to the linear motor (e.g., a magnetic field outside the linear motor) may
exert an influence on detection of the position of the movable piece by
the position detecting means, and particularly a shaft-type linear motor,
which can suppress the above influence to a substantially allowed level.
Yet another object of the invention is to provide a shaft-type linear
motor, in which a magnetic field formed by a field magnet can efficiently
act on an armature coil, and a movable piece can move smoothly along a
stator while suppressing cogging.
Further, another object of the invention is to provide a shaft-type linear
motor, in which adhesion of dust or the like onto a stator is suppressed,
and thereby it is possible to maintain a good sliding state between a
movable piece and the stator for a long term.
The invention provides an image reading apparatus for optically scanning
and reading an image on an original document laid at a predetermined
position, including lighting means for lighting the original document,
light turn-on means for turning on the lighting means, a plurality of
optical part carrying sliders capable of linearly reciprocating in a
predetermined direction and carrying said lighting means on one of said
optical part carrying sliders, and position detecting means for detecting
a position of the slider during reciprocation of the same, said position
detecting means and said light turn-on means being spaced from each other
and located at opposite sides of a center of a travel region of said
sliders.
The invention also provides an image reading apparatus for optically
scanning and reading an image on an original document laid at a
predetermined position, including a plurality of sliders carrying optical
parts and being capable of linearly reciprocating in a predetermined
direction, position detecting means for detecting positions of said
sliders during reciprocation of the same, and an operation panel having a
liquid crystal display for displaying various kinds of information, the
position detecting means and the operation panel being spaced from each
other and located at opposite sides of a center of a travel region of said
sliders.
The invention further provides a shaft-type linear motor including a
rod-like stator having a field magnet provided with N- and S-type magnetic
poles arranged alternately to each other, a movable piece having an
armature coil fitted around said stator and being reciprocatable along
said stator, and a yoke extending along the moving direction of said
movable piece over at least an entire area of travel of said movable
piece, fixed at the vicinity of an outer side of said movable piece and
made of a ferromagnetic material.
The present invention still further provides a shaft-type linear motor
including a shaft-type stator having a drive field magnet formed of a
shaft member provided with N- and S-type magnetic poles arranged
alternately in the longitudinal direction of said shaft member, and a
movable piece having an armature coil, fitted around said stator and being
reciprocatable along the longitudinal direction of said stator, wherein
said shaft-type stator and the movable piece are covered with a protection
cover, and said protection cover supports a portion of said stator at a
position outside a range of travel of said movable piece, allows the
reciprocation of said movable piece within said protection cover and has a
window for coupling therethrough a driven member outside said cover to
said movable piece.
The foregoing and other objects, features, aspects and advantages of the
present invention will become more apparent from the following detailed
description of the present invention when taken in conjunction with the
accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a schematic plan of an example of an image scanner according to
the invention;
FIG. 2 is a schematic side view showing the image scanner in FIG. 1 with a
certain part cut away;
FIG. 3 is a schematic elevation of the image scanner shown in FIG. 1;
FIG. 4(A) is a side view of a linear motor forming first and second slider
driving means in the image scanner shown in FIG. 1,
FIG. 4(B) shows a section of the linear motor, and
FIG. 4(C) is a plan showing, on an enlarged scale, a magnetic scale on a
stator of the linear motor;
FIG. 5(A) shows a magnetic sensor signal detecting circuit of a linear
encoder in the image scanner shown in FIG. 1, and
FIGS. 5(B) to 5(E) show signal waveforms at different positions in the
circuit shown in FIG. 5(A), respectively;
FIG. 6 is a circuit diagram of a control unit of the linear motor in the
image scanner shown in FIG. 1;
FIG. 7 is a schematic perspective view of an example of a linear motor
according to the invention with a certain part removed;
FIG. 8(A) is a schematic cross section of the linear motor taken along line
A--A in FIG. 7, and
FIG. 8(B) shows connection state of coils;
FIG. 9 is a schematic cross section of the linear motor taken along line
B--B in FIG. 8(A);
FIG. 10 is a schematic exploded perspective view of a movable piece in the
linear motor shown in FIG. 7;
FIG. 11(A) shows an example of distribution of magnetic flux formed by a
field magnet,
FIG. 11(B) shows another example of distribution of magnetic flux, and
FIG. 11(C) shows still another example of distribution of magnetic flux;
FIG. 12(A) is a schematic block diagram showing an example of an operation
control circuit of a linear motor,
FIG. 12(B) shows an example of current supply patterns to the coils of each
phase, and
FIG. 12(C) and FIG. 12(D) show current flowing directions at different
positions shown in FIG. 12(B);
FIG. 13 shows an example of an operation control circuit in FIG. 12;
FIG. 14 is a schematic perspective view of another example of a linear
motor according to the invention with a certain part removed;
FIG. 15 is a schematic cross section of still another example of a linear
motor according to the invention;
FIG. 16 is a schematic cross section of further another example of a linear
motor according to the invention;
FIG. 17 is a schematic cross section of still further another example of a
linear motor according to the invention;
FIG. 18(A) is a schematic plan of an image reading apparatus employing the
linear motor of the invention,
FIG. 18(B) is a schematic side view of the apparatus, and
FIG. 18(C) is a schematic cross section of the apparatus taken along line
C--C in FIG. 18(B);
FIG. 19 is a schematic perspective view of an example of a shaft-type
linear motor according to the invention;
FIG. 20 is a plan of the linear motor shown in FIG. 19 with an upper cover
member removed;
FIG. 21(A) is a schematic cross section of the linear motor shown in FIG. 1
taken along vertical plane with a cover unillustrated,
FIG. 21(B) is a cross section taken along line A--A in FIG. 21(A), and
FIG. 21(C) shows a distribution of magnetic flux of a field magnet;
FIG. 22(A) is a block diagram schematically showing an operation control
circuit of the linear motor shown in FIG. 19, and
FIG. 22(B) shows a major portion of the operation control circuit including
a speed control circuit of a phase lock control type;
FIG. 23 is a schematic perspective view of another example of a shaft-type
linear motor according to the invention;
FIG. 24(A) is a schematic perspective view showing still another example of
a shaft-type linear motor according to the invention with a driven member
attached thereto, and
FIG. 24(B) is a schematic cross section of the linear motor shown in FIG.
24(A); and
FIG. 25 is a schematic side view of a linear motor in the prior art.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
First and second image reading apparatuses will now be described below as
preferred embodiments of the invention.
The first image reading apparatus is an apparatus for optically scanning
and reading an image on an original document laid at a predetermined
position, and includes lighting means for lighting the original document,
light turn-on means for turning on the lighting means, a plurality of
optical part carrying sliders capable of linearly reciprocating in a
predetermined direction and carrying said lighting means on one of said
optical part carrying sliders, and position detecting means for detecting
positions of the sliders during reciprocation of the same. The position
detecting means and the light turn-on means are spaced from each other and
located at opposite sides of a center of a travel region of the sliders.
As an example of the above first image reading apparatus, an image reading
apparatus, which is provided for optically scanning and reading an image
on an original document laid at a predetermined position, may include
lighting means for lighting the original document, light turn-on means for
turning on the lighting means, a first slider capable of linearly
reciprocating in a predetermined direction and carrying said lighting
means and a mirror for leading image light beams reflected by the original
document in a predetermined direction, a second slider capable of
reciprocating in the same direction as the first slider and carrying
mirrors for leading image light beams coming from the mirror on the first
slider in a predetermined direction, first position detecting means for
detecting the position of the first slider, and second position detecting
means for detecting the position of the second slider. The first and
second position detecting means are spaced from the light turn-on means
with a center of a travel region of the sliders therebetween.
The second image reading apparatus is an apparatus for optically scanning
and reading an image on an original document laid at a predetermined
position, and includes a plurality of sliders carrying optical parts and
being capable of linearly reciprocating in a predetermined direction,
position detecting means for detecting positions of said sliders during
reciprocation of the same, and an operation panel having a liquid crystal
display for displaying various kinds of information. Said position
detecting means and said operation panel are spaced from each other and
located at opposite sides of a center of a travel region of said sliders.
As an example of this image reading apparatus, an image reading apparatus,
which is provided for optically scanning and reading an image on an
original document laid at a predetermined position, may include a first
slider capable of linearly reciprocating in a predetermined direction and
carrying lighting means for lighting the original document and a mirror
for leading image light beams reflected by the original document in a
predetermined direction, a second slider capable of reciprocating in the
same direction as the first slider and carrying mirrors for leading the
image light beams coming from the mirror on the first slider in a
predetermined direction, first position detecting means for detecting the
position of the first slider, and second position detecting means for
detecting the position of the second slider. The first and second position
detecting means are spaced from said operation panel with a center of a
travel region of said sliders therebetween.
In either of the first and second image reading apparatuses, a focusing
lens and one or more mirrors, which are operable to lead the image light
beams onto a photosensitive member for forming an electrostatic latent
image in an electrophotographic manner, may be arranged at a position on
an optical axis of the reflected image light beams downstream to the
mirror on the slider (e.g., second slider). Instead of the mirrors, an
image sensor such as a CCD imaging element may be arranged downstream to
the focusing lens on the above optical axis. The former can be applied to
an image reading apparatus for a machine such as an analog copying
machine. The latter may be applied to an image reading apparatus for a
machine such as a digital copying machine, image scanner or the like.
In either of the first and second image reading apparatuses, the number,
positions and directions of the reflection mirrors on the sliders are not
restricted.
In either of the first and second image reading apparatuses, driving means
for linearly reciprocating each slider in the predetermined direction may
be selected from various kinds of means such as a linear motor or a rotary
motor coupled to the slider through a transmission mechanism such as a
wire-pulley mechanism.
In either of the first and second image reading apparatuses, the position
detecting means may include a magnetic encoder scale stationarily arranged
along the reciprocating direction of the slider, and a magnetism detecting
element arranged on the slider for integral reciprocation and opposed to
the encoder scale. The magnetism detecting element may be an MR element
which is a kind of magnetoresistance element. In this case, the position
detecting means usually further includes a detecting circuit for detecting
an output of the magnetism detecting element. Therefore, the output signal
(detected information) of the magnetism detecting element is usually
supplied to the detecting circuit. The detecting circuit may include at
least one of an amplifier circuit for amplifying the above input signal, a
low-pass filer circuit for removing high-frequency component of the input
signal, and a digitizing circuit for digitizing the input signal. The
detecting circuit is preferably arranged near the magnetism detecting
element. More specifically, in the first image reading apparatus, the
magnetism detecting element and the detecting circuit are desirably spaced
from the light turn-on circuit with a center of a travel region of the
slider therebetween. In the second image reading apparatus, the magnetism
detecting element and the detecting circuit are desirably spaced from the
operation panel with a center of a travel region of the slider
therebetween. The magnetism detecting element may be arranged on a circuit
board on which the detecting circuit is formed. If the position detecting
means is formed of the encoder including the magnetism encoder scale and
the magnetism detecting element as described above, the detected
information can be utilized for detecting the position of the slider, and
can also be utilized for control of slider driving (e.g., position control
and speed control).
In either of the first and second image reading apparatuses, the positions
spaced from each other with the center of the travel region of the slider
therebetween may be specifically positions at front and rear sides of the
apparatus.
The lighting means in the first image reading apparatus may be typically a
fluorescent lamp. If the lighting means is a fluorescent lamp, the light
turn-on means may typically include an inverter circuit for turning on the
fluorescent lamp.
In the first image reading apparatus, the position detecting means is
arranged at a position remote from the light turn-on means (e.g., at the
front side of the apparatus remote from the rear side). Therefore, in the
foregoing structure wherein the position detecting means includes the
magnetic encoder scale and the magnetism detecting element, the lighting
means is the fluorescent lamp and the light turn-on means includes the
inverter circuit, the magnetism detecting, element (preferably, the
magnetism detecting element and the above detecting circuit) is arranged
at a position remote from the inverter circuit generating high frequency
noises, so that the position detection by the magnetism detecting element
is suppressed from being affected by the noises. This allows precise
position detection. In this case, a cable for electrically connecting the
fluorescent lamp and the lamp turn-on circuit is preferably connected to
the fluorescent lamp through a position near the inverter circuit remote
from the magnetism detecting element. Since this cable forms a source of
high frequency noises, the above arrangement in which the connection cable
is remote from the magnetism detecting element (preferably, the magnetism
detecting element and the detecting circuit) can further suppress an
influence by the noises exerted on the position detection by the magnetism
detecting element.
In the second image reading apparatus, the position detecting means is
arranged at the position remote from the operation panel (e.g., at the
front side of the apparatus remote from the rear side). Therefore in the
foregoing structure wherein the position detecting means includes the
magnetic encoder scale and the magnetism detecting element as described
above, the magnetism detecting element (preferably, the magnetism
detecting element and the detecting circuit) is located at the position
remote from the operation panel (e.g., at the front side of the apparatus
remote from the rear side) which generates high frequency noises
(particularly from its LCD and LCD drive circuit). Accordingly, the
position detection, by the magnetism detecting element is suppressed from
being affected by the noises, which allows further precise position
detection.
Such an image reading apparatus may be employed that includes a combination
of the first and second image reading apparatuses, and in other words,
such an image reading apparatus may be employed that is provided for
optically scanning and reading an image on an original document laid at
the predetermined position, and includes lighting means for lighting the
original document, light turn-on means for turning on the lighting means,
a plurality of optical part carrying sliders reciprocating linearly in a
predetermined direction and carrying the lighting means on one of the
sliders, position detecting means for detecting the positions of the
sliders during reciprocation of the same, and an operation panel having an
LCD displaying various kinds of information, and particularly that the
position detecting means includes a magnetic encoder scale and a magnetism
detecting element, the lighting means is the fluorescent lamp, and the
light turn-on means includes an inverter circuit. In this case, the
magnetism detecting element, the inverter circuit and the operation panel
may be arranged as follows. The magnetism detecting element is spaced from
the fluorescent lamp drive circuit and the operation panel with the center
of the slider travel region therebetween. Similarly to the former case,
the detecting circuit is desirably arranged near the magnetism detecting
element and arranged with respect to the inverter circuit-dnd the
operation panel to establish the same positional, relationship as that
described above. For example, the operation panel is arranged at the front
position of the apparatus for easy operation. The inverter circuit for
turning on the fluorescent lamp is also arranged at the front position of
the apparatus. The magnetism detecting element (more preferably, together
with the detecting circuit) is arranged at the rear position of the
apparatus. Thereby, the foregoing relationship can be satisfied.
Image reading apparatuses of preferred embodiment of the invention will be
described below with reference to FIGS. 1 to 6.
FIGS. 1 to 3 show an example of an image scanner according to the
invention. More specifically, FIG. 1 is a schematic plan of the scanner,
FIG. 2 is a schematic side view of the same with a certain part cut away,
and FIG. 3 is a schematic elevation of the same. An original document
table glass is not shown in FIG. 1.
In the following de | | |
