JP2003087460A - Image reader and hinge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image reader with a small sized hinge. SOLUTION: The hinge comprises a base 50a locked to an original cover 60 and a rod member 50b pivotally supported to the base 50a in a freely rocking manner. A main body 12 locks an end of a rod member 50b remoter from a rock shaft A. A base end of an elastic part 51 is connected to the base 50a and when the original cover 60 is rocked from a fully open position to a fully closed position, the tip of the elastic part is depressed by the end of the rod member near the rock shaft A so that the elastic part 51 is elastically deformed in a direction parted from the rock shaft A. The elastic force of the elastic part 51 keeps the original cover 60 at its fully opened position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image reading device and a hinge.

[0002]

2. Description of the Related Art An image reading apparatus called a flat bed type is known. The flatbed type image reading apparatus is provided with a document cover that holds down a subject placed on a document table. This original cover is swingably connected to the main body by a hinge. This hinge requires a holding force that positions the document cover in the fully open position while the user places the subject on the document table.

FIG. 7 shows a conventional example of a hinge of a flat bed type image reading apparatus. The manuscript cover 204 covers the manuscript table 201 in a fully closed position and is substantially perpendicular to the manuscript table 201 in a fully opened position. A hinge for swingably connecting the document cover 204 to the main body 211 and orienting the document cover 204 in the fully open position is composed of a base portion 203 and a rod member 210 both made of a resin material. The rod-shaped member 210 is inserted into the main body housing 212. The rod member 210 is provided with a shaft rod 209 rotatably supported by the base portion 203. The base 203 is screwed to the bosses 206 and 207 of the cover housing 205. The base portion 203 is provided with a cantilever-shaped elastic portion 208 that is curved in an arc shape. The elastic portion 208 is the rod-shaped member 2.
It is provided at a position closer to the shaft rod 209 as compared with the pin 202 provided on the No. 10. The outer wall of the elastic portion 208 on the far side of the shaft rod 209 has the rod-shaped member 21 with respect to the base portion 203.
The shape is set so that when the 0 swings, it partially projects into the arcuate locus drawn by the pin 202. Therefore, when the document cover 204 swings from the fully open position to the fully closed position, the pin 202 and the elastic portion 208 exert a force on each other, and the pin 202 elastically deforms the elastic portion 208 in the direction approaching the shaft 209. The elastic portion 208 is pushed out of the arcuate locus drawn by the pin 202. When the document cover 204 is closed from the fully open position, the elastic force exerted on the pin 202 by the elastic portion 208 acts as the swing resistance of the document cover 204. Therefore, the document cover 204 is localized in the fully open state unless an external force acts in the closing direction.

[0004]

In the flatbed type image reading apparatus, the housing is becoming thinner, and
The smaller the hinge, the higher the degree of freedom in design. Therefore, it is desired to reduce the size of the hinge.

However, in the hinge shown in FIG. 7, the shaft rod 2
09 so that it can be elastically deformed in a direction approaching 09.
It is necessary to secure a certain distance between the shaft 8 and the shaft rod 209. Furthermore, since the pin 202 is in sliding contact with the outer wall of the elastic portion 208 farther from the shaft rod, the distance from the rotation center of the rod member 210 to the pin 202 cannot be made too small. For these reasons, it has been difficult to downsize this type of hinge.

The present invention was created in order to solve such a problem, and an object thereof is to provide an image reading device having a small hinge. Another object of the present invention is to provide a hinge having a small size.

[0007]

According to the image reading apparatus of the present invention, the hinge is composed of a base portion which is locked to the original cover and a rod-shaped member which is swingably supported by the base portion and which is formed from the swing shaft. A rod-shaped member whose distant end is locked to the main body, and a base end connected to the base end, and when the document cover swings from the fully open position to the fully closed position, the tip ends at the end of the rod-shaped member near the swing shaft. And an elastic portion that is elastically deformed in a direction in which the portion is pushed away from the swing shaft, and the original cover is localized in the fully opened posture by the elastic force of the elastic portion. According to the image reading apparatus of the present invention, since the elastic portion is pushed by the rod-shaped member and elastically deforms in the direction away from the swing shaft of the rod-shaped member, the size of the hinge can be reduced.

According to the hinge of the present invention, the base portion that is locked to either the movable portion or the main body and the rod-shaped member that is locked to the other of the movable portion or the main body and is swingably supported by the base portion. And an elastic portion that is connected to the base portion at the base end and that when the movable portion swings from the fully open posture to the fully closed posture, the tip end portion of the rod member is pushed and elastically deforms in a direction away from the swing shaft. The elastic portion elastically orients the movable portion in a fully open position. According to the hinge of the present invention, since the elastic portion is pushed by the rod-shaped member and elastically deforms in the direction away from the swing shaft of the rod-shaped member, the size of the hinge can be reduced.

According to the image reading apparatus and the hinge of the present invention, the elastic portion is formed in a cantilever shape in which the base end is connected to the base portion. By holding the original cover in the fully open position with the elasticity generated by the bending of the elastic part,
The structure of the hinge can be simplified.

According to the image reading apparatus and the hinge of the present invention, the proximal end of the elastic portion is located farther from the swing axis than the distal end of the rod-shaped member, and the distal end of the elastic portion is in the fully open position and the fully closed position. It is characterized in that it is located closer to the pivot axis than the tip of the rod-shaped member. Therefore, the physical size of the hinge can be reduced.

According to the image reading apparatus and the hinge of the present invention, the base portion and the elastic portion are integrally formed of a resin material. Therefore, the structure of the hinge can be simplified.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment showing an embodiment of the present invention will be described below with reference to the drawings. FIG. 2 is a schematic diagram showing an image scanner 10 as an embodiment of the image reading apparatus according to the present invention. Image scanner 10
Is a so-called flat bed type in which a document table 14 is provided on the upper surface of a rectangular parallelepiped main body 12.

The original table 14 is formed of a transparent plate such as a generally rectangular glass plate, and a subject M such as a printed document, a photograph, or a book is placed on the plate surface 15 thereof. At the periphery of the document table 14,
A document guide 16 having a substantially rectangular frame shape is joined. The document guide 16 contacts the subject M and contacts the platen surface 15 of the document table 14.
The subject M is positioned above. A white reference plate 28 extending in the main scanning direction is joined to the document guide 16. The white reference plate 28 has a high reflectance uniform reflection surface.

The original cover 60 is swingably connected to the main body 12. The manuscript cover 60 presses the manuscript M placed on the manuscript table 14 and covers the manuscript table 14 so that light other than the light emitted from the light source 22 does not illuminate the subject. A white original mat 61 that is in contact with the original M is fixed to the original cover 60. The original mat 61 may be detachable, and a light source covered by the original mat 61 may be provided inside the original cover 60. The transparent original can be scanned by irradiating the transparent original such as a photographic film with a light source provided on the original cover 60.

The carriage 24 is housed in the main body 12 so as to be capable of reciprocating in parallel with the plate surface 15 of the document table 14. The carriage 24 carries the optical system 30 and the image sensor 20. The carriage 24 is slidably locked to a guide shaft or the like parallel to the plate surface 15 of the document table 14. The longitudinal axis of the guide shaft extends in the B direction in FIG. The carriage 24 is pulled by, for example, a belt to move the image sensor 20 and the optical system 30 to the position shown in FIG.
Carry in the B direction.

The optical system 30 is composed of a light source 22, a mirror 34, a condenser lens 36 and the like. The light source 22 is composed of a tube lighting device such as a fluorescent tube lamp. The light source 22 is
The carriage 24 is mounted such that its longitudinal axis extends parallel to the longitudinal axis of the image sensor 20. As shown by the broken line in FIG. 2, the reflected light image irradiated by the light source 22 on the main scanning line is formed on the image sensor 20 by the mirror 34 and the condenser lens 36.

FIG. 3 is a block diagram showing the image scanner 10. The scanning unit described in the claims is an image sensor 20, a main scanning driving unit 102, and a sub-scanning driving unit 26.
And a signal processing unit 100.

The image sensor 20 is a linear image sensor, and a plurality of photoelectric conversion elements such as photodiodes are mounted on the carriage 24 in a posture in which they are arranged linearly in the direction perpendicular to the paper surface of FIG. Image sensor 20
Scans the optical image on the main scanning line input by the optical system 30 and outputs an electrical signal that correlates with the density of the optical image. The image sensor 20 accumulates electric charges obtained by photoelectrically converting light in a predetermined wavelength region such as visible light, infrared light, and ultraviolet light for a certain period of time, and outputs an electric signal according to the amount of light received by each photoelectric conversion element to a CCD (Charge Coupled Device), MOS transistor switch, etc. are used for output. The image sensor 20 may be a lens reduction type or a contact type. In addition, 3 using a color filter array
Alternatively, a 6-line color image sensor may be used. Alternatively, a contact type area image sensor may be used.

The main scanning drive unit 102 is mounted on a substrate fixed to the carriage 24. The main scanning drive unit 102 is a drive circuit that outputs a drive pulse necessary for driving the image sensor 20 to the image sensor 20. The main scanning drive unit 102 is composed of, for example, a synchronization signal generator, a drive timing generator, and the like.

The sub-scanning drive unit 26 is composed of a belt locked to the carriage 24, a motor and a gear train for rotating the belt, a drive circuit, and the like, and is housed in the main body 12. By pulling the carriage 24 with the belt by the sub-scanning drive unit 26, the main scanning line extending in the direction perpendicular to the paper surface of FIG.

The signal processing unit 100 is an analog signal processing unit 1.
04, A / D converter 106, digital signal processing unit 10
It is composed of 8 etc. The signal processing unit 100 processes the output signal of the image sensor 20 and outputs image data representing an optical image input to the image sensor 20 by the optical system 30. The analog signal processing unit 104 is mounted on a substrate fixed to the carriage 24. Analog signal processing unit 10
Reference numeral 4 performs processing such as amplification and noise reduction on the analog electric signal output from the image sensor 20 and outputs the electric signal. The A / D converter 106 is mounted on a substrate fixed to the carriage 24. The A / D converter 106 quantizes the analog representation electric signal output from the analog signal processing unit 104 into a digital representation image signal of a predetermined bit length and outputs the image signal. The digital signal processing unit 108 is mounted on a substrate fixed to the housing 13 of the main body 12. The digital signal processing unit 108 is the A / D converter 106.
The image signal output from is subjected to various digital signal processing such as shading correction, gamma correction, pixel interpolation and the like to create image data. Note that the various processes performed by the digital signal processing unit 108 may be replaced with processes by a computer program executed by the image processing device 150 such as a personal computer connected to the control unit 110 or the image scanner 10.

The control unit 110 includes a CPU 130 and a RAM 13
2 and ROM 134, and is mounted on a substrate fixed to the housing 13 of the main body 12. The control unit 110 includes a drive circuit for the light source 22, the main scanning drive unit 102, the sub-scanning drive unit 26, and the signal processing unit 100.
Etc. are connected by a bus. The control unit 110 executes a computer program stored in the ROM 134 according to a command from the image processing apparatus 150, and controls the light source 22, the main scanning drive unit 102, the sub-scanning drive unit 26, the signal processing unit 100, and the like.

The interface 140 is a USB, IEEE
The main body 12 is constructed according to a predetermined standard such as E1394.
Mounted on a substrate fixed to the housing 13.
The interface 140 includes the signal processing unit 100 and the control unit 11
0 is connected to the bus. The interface 140 transfers the image data output from the signal processing unit 100 to the image processing device 150.

FIGS. 1, 4 and 5 show a hinge 50 for swingably connecting a document cover 60 to the main body 12. Hereinafter, the configuration of the hinge 50 will be described in detail.
As shown in FIG. 4, the hinge 50 is composed of a base portion 50a and a rod-shaped member 50b, and is provided at two locations on the base end portion of the document cover 60.

The base portion 50a is a screw 6 that is screwed into a boss 63 formed in the housing 62 of the original cover 60.
It is fixed to the housing 62 of the document cover 60 at 5. The base portion 50a is formed of a resin material and has a shaft hole, an elastic portion 51, and a protrusion 55, which are not shown.

The shaft hole of the base portion 50a has a central axis extending in the direction perpendicular to the paper surface of FIGS. 1 and 5 and in the left-right direction of FIG. The central axis of this shaft hole coincides with the swing axis A of the document cover 60.

The elastic portion 51 of the base portion 50a is formed on the front end side (the lower side in FIG. 4) of the original cover 60 with respect to the shaft hole of the base portion 50a. The elastic portion 51 exerts a force on the rod-shaped member 50b to position the original cover 60 in the fully open position shown in FIG. The elastic portion 51 is formed in a cantilever shape curved in an arc shape and has a swing axis A in the longitudinal direction of the document cover 60.
It is located on the front end side, and on the front side from the swing axis A in the thickness direction of the document cover 60. Note that the original mat 61 is referred to as the front side or the back side in the thickness direction of the original cover 60.
The side (left side in FIG. 1 and lower side in FIG. 5) provided with is the back side. The elastic portion 51 is provided in a posture in which the elastic portion 51 approaches the swing axis A from the base end toward the tip end, and in a posture in which the elastic portion 51 is convexly curved to the front side in the thickness direction of the document cover 60. The end wall surface of the elastic portion 51 is smoothly formed in a cylindrical side wall shape. The convex wall surface 52 of the elastic portion 51 is curved and continuous with the tip wall surface and is formed smoothly. As will be described later, the elastic portion 51 receives a force from the rod-shaped member 50b and is elastically deformed in a direction away from the swing axis A, and is deformed in a direction approaching the swing axis A by a restoring force. The material and shape of the elastic portion 51 define the spring constant of the elastic portion 51.

The protrusion 55 of the base 50a is provided with a document cover 60.
In the longitudinal direction of the document cover 6 on the tip side from the swing axis A.
It is located on the back side of the swing axis A in the thickness direction of 0. The protrusion 55 defines the full-open angle of the document cover 60 by contacting the rod-shaped member 50b as described later.

The rod-shaped member 50b is axially supported by the housing 62 of the original cover 60 and the base portion 50a, and is locked to the main body 12. The rod-shaped member 50b is made of a resin material and has a shaft portion 5
4, having a head portion 53 and a leg portion 56. The head portion 53 and the leg portion 56 of the rod-shaped member 50b respectively extend from the shaft portion 54 in two directions perpendicular to the central axis thereof and forming 180 ° with each other. In this direction, the head portion 53 is sufficiently shorter than the shaft portion 54.

As shown in FIG. 4, the shaft portion 54 of the rod member 50b is rotatably supported by the shaft hole of the base portion 50a and the bearing 64 formed in the housing 62 of the original cover 60. The shaft portion 54 may be formed of a different material that is separate from the head portion 53 and the leg portion 56.

As shown in FIGS. 1 and 5, a rod-shaped member 50b
The head 53 is housed inside the housing 62 of the document cover 60. The outer wall of the head portion 53 is curved in a cylindrical side wall shape and is formed smoothly. As shown in FIG.
The distance R from the tip of the rocking shaft to the rocking axis A is larger than the shortest distance r1 from the rocking shaft A to the elastic portion 51 and smaller than the distance r2 from the rocking axis A to the base end of the elastic portion 51. It is larger than the shortest distance r3 from A to the protrusion 55. The difference between R and r1 is equal to the maximum displacement when the elastic portion 51 elastically deforms, and defines the restoring force of the elastic portion 51. When the document cover 60 is opened from the fully closed position shown in FIG. 5 to the fully opened position shown in FIG. 1, the head portion 53 slides on the convex wall surface 52 of the elastic portion 51 and pushes out the elastic portion 51 from the front in the traveling direction to project the protrusion 55. To approach the protrusion 55.

The leg portion 56 of the rod member 50b is removably inserted into the hinge hole 18 formed in the housing 13 of the main body 12. The length of the leg portion 56 is such that when a thick subject such as a book is placed on the document table 14, the main body 12 is in a position parallel to the document table 14 at a position apart from the document table 14 by several tens of millimeters. The length is set to be sufficient to connect the document cover 60 to the.

The structure of the hinge 50 has been described above. Hereinafter, the operation of the hinge 50 will be described in detail.

FIG. 5 shows a state in which the document cover 60 covers the document table 14 in the fully closed posture. At this time, if the subject is not placed on the document table 14, the document mat 61 contacts the plate surface of the document table 14. Since the leg portions 56 of the two rod-shaped members 50b are respectively inserted into the hinge holes 18 of the main body 12, the document cover 60 does not move in the direction parallel to the plate surface of the document table 14. The legs 56 have hinge holes 18
Since the leg portion 56 is pulled out from the hinge hole 18, the document cover 60 is inserted into the document table 1.
4 can be moved in a vertical direction in a posture parallel to the board surface. Therefore, a thick subject such as a book can be pressed against the surface of the document table 14 by using the large area of the back surface of the document cover 60.

When the document cover 60 is opened from the fully closed position, the bearing 54 formed in the housing 62 of the document cover 60 and the inner wall of the shaft hole of the base portion 50a are slidably supported by the shaft portion 54 of the rod member 50b. . Therefore, the document cover 60 rotates about the swing axis A in the clockwise direction on the paper surface of FIG. At this time, the document cover 60 is supported by the two rod-shaped members 50b and the hand that lifts the document cover 60. The counterclockwise torque due to gravity acting on the document cover 60 and the counterclockwise torque due to the frictional force acting between the bearing 54 and the base 50a formed on the housing 62 of the document cover 60 and the shaft 54 of the rod-shaped member b. When a clockwise torque larger than the combined torque with the torque is applied to the document cover 60 by hand, the rod-shaped member 50b from the fully closed position is obtained.
The document cover 60 can be opened until the elastic portion 51 of the base portion 50a comes into contact with the head portion 53 of the document cover 60. The more the document cover 60 is opened, the more the document cover 6 is opened until the elastic portion 51 of the base 50a contacts the head 53 of the rod member 50b from the fully closed position.
Since the counterclockwise torque due to gravity acting on 0 becomes small, the force applied by hand to open the document cover 60 becomes small.

When the original cover 60 is further opened from the state where the elastic portion 51 of the base portion 50a is in contact with the head portion 53 of the rod member 50b, the elastic portion 51 of the base portion 50a is pushed by the head portion 53 of the rod member 50b and rocks. It elastically deforms in the direction away from the moving axis A. Therefore, in order to open the document cover 60,
The combined torque of the counterclockwise torque due to the force exerted on the head portion 53 by the elastic portion 51 itself and the counterclockwise torque due to the frictional force acting between the elastic portion 51 and the head portion 53 is further added. Clockwise torque is required. When the contact point between the elastic portion 51 and the head portion 53 is the tip of the head portion 53 (the portion farthest from the swing axis A), the restoring force of the elastic portion 51 is maximized. At this time, the frictional force acting between the elastic portion 51 and the head 53 is maximized.

The contact point between the elastic portion 51 and the head 53 is the head 53.
When the original cover 60 is opened further from the state of the tip of the
The elastic portion 51 has its tip surpassing the head portion 53 and swinging axis A.
It is displaced in the direction of approaching to and restored and deformed. Original cover 6
As shown in FIG. 1, the head 53 has a projection 5 of the base 50a.
Open until it touches 5.

FIG. 1 shows the document cover 60 in the fully open position. When the document cover 60 is in the fully open position, the protrusion 55 and the head 53 of the base 50a are in contact with each other. Therefore, the document cover 60 does not rotate further clockwise from the posture shown in FIG. 1 unless a force that destroys the hinge 50 acts. When the document cover 60 is in the fully open position,
As the head 53 is in contact with the elastic portion 51, the head 53,
It is desirable to set the shapes and positional relationships of the elastic portion 51 and the protrusion 55. This is because the stability of the document cover 60 in the fully open position is improved by doing so. Further, when the longitudinal axis of the document cover 60 is substantially perpendicular to the plate surface of the document table 14, the projection 55 and the head 53 are shaped so that the projection 55 and the head 53 of the base 50a contact each other. And it is desirable to set the positional relationship.

When the original cover 60 is closed from the fully open position, the elastic portion 51 of the base portion 50a is pushed by the head portion 53 of the rod member 50b and elastically deforms in the direction away from the swing axis A. Therefore, the document cover 60 is moved from the fully open position.
When closing, the clockwise torque due to the force exerted on the head 53 by at least the restoring force of the elastic portion 51 and the elastic portion 5
A counterclockwise torque that exceeds the combined torque of the clockwise torque due to the frictional force acting between the head 1 and the head 53 is required. Therefore, the hinge 50 positions the document cover 60 in the fully opened posture.

The operation of the hinge 50 has been described above. The effects of the above embodiment will be described below. According to the above-described embodiment, since the elastic portion 51 is elastically deformed in the direction of separating from the swing axis A, the head portion 53 of the rod-shaped member 50b can be made small. Therefore, the size of the hinge 50 can be made smaller than that of the conventional hinge shown in FIG.

The hinge 50 has a simple structure because both the base portion 50a and the rod-shaped member 50b are made of a resin material and each is made of one component. Therefore, it is easy to manufacture and highly reliable.

Further, according to the hinge 50, since the head portion 53 and the elastic portion 51, which are made of a resin material having a smooth contact surface, are in sliding contact with each other and exert a force on each other, the opening / closing operation of the original cover 60 is smooth and the opening / closing operation is performed. It can sometimes give people a moderate sense of resistance.

The hinge 50 is not limited to the flatbed type image scanner 10, but can be used for other purposes such as connecting a document cover of a copying machine to the main body.

FIG. 6 is a schematic diagram for explaining another embodiment of the present invention. 6A shows a state where the movable portion 71 is connected to the main body 78 in a fully closed posture, and FIG. 6B shows a state where the movable portion 71 is connected to the main body 78 in a fully opened posture. .

The elastic portion 73 may be formed integrally with the base portion 72 or separately. For example, the elastic portion 73
May be a leaf spring locked to the base 72. The elastic portion 73 may be composed of one part or plural parts. For example, the elastic portion 73 may be composed of a coil spring whose base end is locked to the base portion 72 and a hemispherical member fixed to the tip of the coil spring. The elastic portion 73 is not limited to the cantilever shape, and its tip (the portion closest to the swing shaft 76) is elastically deformed by the tip portion 74 of the rod member 76 so as to reciprocate in the vertical direction with respect to the swing shaft 76. Any shape can be used.

The base portion 72 may be formed separately from or integrally with the movable portion 71. The base end portion 77 of the rod-shaped member 76 is not limited to the insertion and may be locked to the main body 78 in any manner. For example, it may be fastened to the main body 78 with a screw or may be glued.

The shape and positional relationship between the tip end portion 74 of the rod-shaped member 76 and the elastic portion 73 are such that the elastic portion 7 is more elastic than the tip end of the rod-shaped member 76 at least when the movable portion 71 is in the fully open posture and the fully closed posture.
It suffices that the tip of 3 is located closer to the swing shaft 75.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a hinge according to an exemplary embodiment of the present invention.

FIG. 2 is a schematic diagram showing an image scanner according to an embodiment of the present invention.

FIG. 3 is a block diagram showing an image scanner according to an exemplary embodiment of the present invention.

FIG. 4 is a partially cutaway plan view showing a hinge according to an exemplary embodiment of the present invention.

FIG. 5 is a sectional view showing a hinge according to an exemplary embodiment of the present invention.

FIG. 6 is a schematic view showing another embodiment of the present invention.

FIG. 7 is a cross-sectional view showing a conventional hinge.

[Explanation of symbols]

10 image scanner 12 body 13 housing 14 Platen 18 Hinge hole 20 Linear image sensor 22 Light source 30 Optical system 40 scanning unit 50 hinges 50a base 50b rod-shaped member 51 Elastic part 53 heads 54 Shaft 55 Projection 56 legs 60 original cover 62 housing 71 Moving part 72 base 73 Elastic part 74 Tip 75 swing axis 76 Rod-shaped member 77 Base end 78 body

Front page continuation (51) Int.Cl. ⁷ Identification code FI theme code (reference) H04N 1/10 H04N 1/10 1/107 F term (reference) 2E032 BA01 CA02 DA02 DC02 2H012 CB12 5B047 AA01 BA02 BB02 BC14 BC20 BC30 5C062 AA01 AB02 AB33 AD02 AD06 BA01 5C072 AA01 BA01 DA25 EA07 LA08

Claims (8)

[Claims] 1. A scanning unit that scans an optical image and outputs image data representing the optical image, a main body having a transparent document table on which a subject is placed, and an optical image of the subject is input to the scanning unit. An image reading apparatus comprising: an optical system, a document cover that covers the document table in a fully closed position, and a hinge that swingably connects the document cover to the main body to orient the document cover in a fully opened position. A base member that is locked to the document cover, a rod-shaped member that is pivotally supported by the base member, and an end portion far from the swing shaft is locked to the main body; When the base end is connected to the base portion and the document cover is swung from the fully open position to the fully closed position, the tip end portion is pushed by the end part of the rod-shaped member near the swing shaft and separated from the swing shaft. And an elastic portion that elastically deforms in a direction, Image reading apparatus characterized by localizing the document cover in the fully open position by the force. 2. The image reading device according to claim 1, wherein the elastic portion is formed in a cantilever shape having a base end connected to the base portion. 3. A proximal end of the elastic portion is located farther from the swing shaft than a distal end of the rod-shaped member near the swing shaft, and a distal end of the elastic portion is a position where the original cover is in a fully open position and a fully open position. 3. The image reading apparatus according to claim 2, wherein, in the closed posture, the rod-shaped member is positioned closer to the swing shaft than the tip of the rod-shaped member is closer to the swing shaft. 4. The base portion and the elastic portion are integrally formed of a resin material.
The image reading device described. 5. A hinge for swingably connecting a movable part to a main body and positioning the movable part with respect to the main body in a fully open position, the hinge being locked to either the movable part or the main body. A base portion, a rod-shaped member that is locked to either the movable portion or the main body and is pivotally supported by the base portion, and a proximal end is connected to the base portion, and the movable portion has a fully open to fully closed posture An elastic portion that is elastically deformed in a direction in which the tip portion is pushed by the tip of the rod-shaped member when swinging up to and away from the swing shaft, and the movable portion is localized in the fully open position by the elastic force of the elastic portion. Hinge characterized by that. 6. The hinge according to claim 5, wherein the elastic portion is formed in a cantilever shape having a base end connected to the base portion. 7. A base end of the elastic portion is located farther from the swing axis than a tip end of the rod-shaped member, and a tip end of the elastic portion is formed on the rod-shaped member when the movable portion is in a fully open position and a fully closed position. 7. The hinge according to claim 6, wherein the hinge is located closer to the swing shaft than the tip. 8. The base portion and the elastic portion are integrally formed of a resin material.
Hinge as described.