JP3179507B2 - Image reading light source and image reading device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light source for illuminating a document of an image reading apparatus and an image reading apparatus to which the light source for illuminating the document is mounted, and more particularly, to a light source for a document reading section of a document reading section such as a facsimile or an image scanner. And a document reading device.

[0002]

2. Description of the Related Art A light source in an image reading apparatus such as a facsimile or an image scanner is not only an important component in improving image forming performance and image quality, but also affects the size of the apparatus. Things. Conventionally,
As a light source of the image reading apparatus, a light emitting diode (hereinafter, referred to as LED) array is often used because it is small, easy to handle, and inexpensive.

FIG. 12 is a view for explaining a conventional illumination light source using an LED array. In the figure, 31 is an LED array, 32 is a bar lens, 33 is a substrate, and 34 is a document surface. In the figure, an LED array 31 is composed of a large number of LEDs arranged on a straight line perpendicular to the paper surface.
2 is arranged in parallel on the LED array 31. Therefore, in such an optical system, the illumination light L from the LED array 31 is condensed only in a direction perpendicular to the substrate 33, so that the layout of the document surface 34, the reading optical system (not shown), and the reading sensor is restricted. There is a problem that the degree of freedom of design is limited.

FIG. 13 is a view for explaining another conventional illumination light source using an LED array. In the figure, 35 is a reflector, 35a is a first reflection surface, 35b is a second reflection surface, and others. Working parts similar to those in FIG. 12 are denoted by the same reference numerals. The illumination light source shown in FIG. 13 has been proposed by the present applicant to solve the above-mentioned problem of the illumination light source shown in FIG. The light emitted from the LED array 31 is reflected from the first reflecting surface 35a of the reflector 35 and
2 and a bar lens 3
2 as it is, is reflected by the second reflection surface 35b, and is condensed on the document surface 34.

However, there is a vignetting region B which does not contribute to illumination in the effective reflection region A of the reflected light of the first reflection surface 35a. The vignetting area B includes the first reflecting surface 35a and the bar lens 32.
Is a portion where illumination light which does not reach the document surface 34 at the contact portion P due to a difference in refractive index between different members is generated.

Although the vignetting area B should be as small as possible in order to improve the illumination efficiency, the design is very difficult and the degree of freedom in design is limited. In order to solve this problem, the present applicant has proposed a lighting device disclosed in Japanese Utility Model Laid-Open Publication No. 1-126658.

FIG. 14 is a view for explaining the above-mentioned conventional illumination light source, in which 36 is a converging bar lens, 37 is a first reflecting surface, 38 is a converging surface, and 39 is a second reflecting surface. And FIG.
The same reference numerals are given to the parts which operate in the same manner as in the first embodiment.

In the figure, a converging bar lens 36 is
And a light-condensing surface 3 having a curvature for condensing light reflected from the first reflection surface 37.
8 are arranged along the arrangement direction of the LED array 31 and are integrally formed of resin with the LED array 31. The second reflecting surface 39 is provided on the light collecting surface 38.
It is formed on the upper part along the longitudinal direction of the converging bar lens 36.

The LED array 3 in the converging bar lens 36
The light emitted from 1 is a converging bar lens 3 having a refractive index of n _2.
6 and is reflected on a first reflecting surface 37 which is a boundary surface with air having a refractive index of n. Of the reflected light, the reflection in the region c ₁ is totally reflected, reflected and form an effective area c of the illumination light by the reflection surface formed by deposition or the like on the first reflecting surface 37 in Ryoryo c ₂ is not totally reflected, The light in the effective area c is focused on the document surface 34. On the other hand, the light that has not directly reflected on the first reflecting surface 37 and directly reaches a part of the light collecting surface 38 is reflected by the second reflecting surface 39.
As a result, the light is condensed on the original surface 34 and is added to the reflected light from the first reflecting surface 37 to efficiently illuminate the original surface 34 as a whole.

[0010] However, the above-mentioned lighting device adds the first and second reflecting surfaces 37 and 39 to the converging bar lens 36 of the light source of the LED array 31 to improve the lighting efficiency and save space. The width as an illumination light source is small when viewed from the original surface 34 side, but the LED substrate 3
The width of the light source 3 is not improved, and the volume occupying the entire illumination light source is almost the same as the volume of the conventional example shown in FIG. 13. I couldn't.

FIG. 11 is a view showing a conventional image reading apparatus. In FIG. 11, reference numeral 40 denotes a roof mirror lens array (RML).
A), 41 is a 1: 1 sensor, 42 is a contact glass, 4
3 is a roller, 44 is a frame, 45 is a conventional LED illumination light source, 46 is a lens array (LA), 47 is an aperture plate,
48 is a roof mirror array (RMA), and 49 is an optical path separating mirror (SM).

Roof mirror lens array (RMLA) 4
Reference numeral 0 denotes a lens array (LA) 46 in which a plurality of lenses are continuously formed, and a roof mirror array (RMA) 48 in which a plurality of roof-shaped reflecting surfaces are continuously formed at an arrangement pitch of the lens array (LA) 46. An aperture plate 47 having a structure for blocking stray light between adjacent lenses between the lens array (LA) 46 and the roof mirror array (RMA) 48 is formed on the lens array (LA) 46 and the roof mirror array (RMA) 48. A reference pin (not shown), a member engaged and integrated with a reference hole (not shown) formed in an aperture plate 47, an optical path separating mirror (SM) 49, an LED illumination light source 45, and a 1: 1 sensor 41 It is built into the frame 44 and fixed. Further, a contact glass 42 is provided so that the original comes into close contact with the frame 44 when the original is pressed against the frame 44 by the roller 43 to constitute a 1: 1 sensor unit. In the drawing, the LED illumination light source 45 is shown in FIGS.
Since the width of the substrate 33 is large, unnecessary space that does not contribute to illumination increases, and the frame 44 becomes large accordingly, which hinders miniaturization.

The light emitting element of the LED illumination light source 45 is L
The ED chip was sealed in a plastic package having a cylindrical lens to improve the light collection efficiency. FIG. 10 is a diagram showing a perspective external view of a plastic package of a conventional LED, in which 12 is a plastic package, 12a is a cylindrical lens, and 12b is a rib. However, the shape of the conventional plastic package shown in FIG. 10 has an angle from the vertical direction (normal direction) of the LED light emitting chip because the ribs 12b are provided on both sides parallel to the generatrix of the cylindrical lens 12a. Has a disadvantage that the light-collecting performance in the direction perpendicular to the generatrix decreases.

[0014]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above-mentioned object. As a method of disposing an LED light-emitting chip, a method for improving the wiring pattern of the substrate on which the LED light-emitting chip is disposed is improved. The purpose of the present invention is to reduce the size of the illumination light source by reducing the width, and to reduce the size of the image reading device by using the illumination light source for reducing the volume ratio by reducing the substrate width for image reading. Things.

[0015]

To achieve the above object, the present invention provides (1)
On the substrateSubstantially straight in the longitudinal direction of the substrateProvided
Several light emitting elementsLight-emitting element array consisting ofAnd the light emitting elementColumnWhen
Almost on the same straight lineArranged inMultipleCurrent limitComposed of resistance
ToCurrent limiting resistorColumnAnd the light emitting elementColumnAnd the current limit
resistanceColumnOn both sides ofThe light emitting element row and the current limiting resistor
Columns andArranged in parallelAnd power supply wiring.Power supply
DistributionlineThe light emitting element and the current limiting resistor were connected toThis
And (2) on the substrateSubstantially straight in the longitudinal direction of the substrate
LinearlyProvided,And,Sealed in plastic package
StoppedMultipleLight emitting elementLight-emitting element array consisting ofAnd the departure
Optical elementColumnWhenAlmost on the same straight lineArranged inMultipleCurrent limit
Consist of resistanceCurrent controlLimitedAntiColumnAnd the light emitting elementColumnas well asPrevious
RecordCurrent controlLimitedAntiColumnOn both sides ofThe light emitting element row and current
Limiting resistor string andArranged in parallelTadenSourceDistributionLine and
The long side of the plastic packageThe light emitting element array and
And the current limiting resistor line, and the light emitting element and the current
And a limiting resistor connected to the power supply wiring.That, further
Is (3) on the substrateSubstantially straight in the longitudinal direction of the substrateSetting
Kere,And,Sealed in plastic package
MultipleLight emitting elementLight-emitting element array consisting ofAnd the light emitting elementColumn
WhenAlmost on the same straight lineArranged inMultipleCurrent limitFrom resistance
BecomeCurrent controlLimitedAntiColumnAnd the light emitting elementColumnas well asSaidCurrent control
LimitedAntiColumnOn both sides ofThe light emitting element array and the current limiting resistor
Power supply wiring arranged in parallel with the anti-row,The
Plastic packageIs opposite to the surface in contact with the substrate.
On the other sideCylindrical lensIs formedThe cylindrical lens
Is perpendicular to the direction of arrangement of the plastic package
DirectionHas a curved surfaceFormed on the entire surfacePlastic package
A long side of the plastic package.
Arranged in parallel with the optical element row and the current limiting resistor row,
An element and a current limiting resistor were connected to the power supply wiringThis
And (4) on the substrateSubstantially straight in the longitudinal direction of the substrate
LinearlyProvidedAnd sealed in a plastic package
StoppedMultiple light emitting elementsLight-emitting element array consisting ofAnd the departure
Optical element row andAlmost on the same straight lineArranged inMultipleCurrent limit
Consist of resistanceCurrent controlLimitedAntiColumnAnd the light emitting elementColumnAnd before
Current limiting resistorColumnOn both sides ofThe light emitting element row and current
Limiting resistor string andArranged in parallelTadenSourceDistributionLine and
Said BoardThe light emitting elementLight emission ofCondensing bar lens on the side
Is provided, and the light-collecting bar lensstraightThe diameter and the width of the substrate
Are configured to matchAnd the current limiting resistor with the light emitting element.
To the power supply wiringThat, and
(5) On the substrateSubstantially straight in the longitudinal direction of the substrateProvided
Multiple light emitting elementsLight-emitting element array consisting ofAnd the luminous element
ChildColumnWhenAlmost on the same straight lineArranged inMultipleCurrent limitresistance
Consisting ofCurrent limiting resistorColumnAnd the light emitting elementRow and said telephone
The flow limiting resistor array is provided.On the back of the boardAnd the substrate
At both ends in the longitudinal direction, the longitudinal direction of the substrate or the
Light emitting elementColumnAre arranged in parallel with the arrangement direction ofTadenSourceDistributionline
And the light-emitting elementAnd electricityFlow limiting resistanceThe power supply
For supply wiringConnected, and (6) on the boardThe group
Substantially straight in the longitudinal direction of the plateProvided,And,Plastic
Sealed inside the packageFrom multiple light emitting elements
BecomeLight emitting elementColumnAnd the light emitting elementColumnWhenAlmost on the same straight lineInstalled in
Was doneMultipleCurrent limitConsist of resistanceCurrent limiting resistorColumn
And the light emitting elementA row and the current limiting resistor row are provided.
SaidBack side of substrateNear the both ends in the longitudinal direction of the substrate,
The longitudinal direction or theLight emitting elementColumnIs arranged in parallel withTaden
SourceDistributionAnd the light emitting elementAnd electricityFlow limiting resistance
ToIn the power supply wiringConnect the plastic package
PageIs the plastic packageLuminescent element sealed in
The width in the direction perpendicular to the arrangement direction of the elements is substantially equal to the width of the substrate.
And (7) Claims
The image reading light source according to any one of 1 to 6, and an image of the same magnification
Element, a unity-magnification sensor, and a frame holding each of these elements.
(8) a plurality of lenses
A lens array (LA), which is a member formed successively,
The roof type reflective surface is arranged at the pitch of the lens array (LA).
Roof mirror array, which is a member formed continuously
A (RMA), lens array (LA) and roof mirror
Stray light between adjacent lenses between the array (RMA)
A diaphragm plate that blocks light, an optical path separation mirror, a housing, etc.
Imaging element consisting of (roof mirror lens array: RML
A) was used, and (9) the same-magnification imaging element
Characterized by using a gradient index rod lens array
Is what you do.

Hereinafter, a description will be given based on an embodiment of the present invention. FIGS. 1A and 1B are diagrams for explaining a first embodiment (claims 1 and 2) of an image reading light source according to the present invention, wherein FIG. The figure and figure (b) are side views. In the figure, 1 is a light emitting element (LED; light emitting diode),
2 is an LED chip, 3 is a current limiting resistor, 4 is a substrate, 5
Reference numerals a and 5b denote power supply wirings, 7 a wiring pattern, and 30 a lighting power supply.

In the figure, a light emitting element 1 is one in which an LED chip 2 is sealed in a transparent plastic package, and the light emitting element 1 and a current limiting resistor 3 for limiting the current of the light emitting element 1 are mounted on a substrate 4. The power supply wirings 5 a and 5 b are arranged on the upper side of the substrate 4 in parallel with the row of the light emitting elements 1 and the current limiting resistor 3 arranged on both sides of the substrate 4. The light emitting element 1 is connected to the power supply wirings 5a and 5b.
A light-emitting element (two light-emitting elements 1 and one current-limiting resistor 3 in FIG. 1) in which the current-limiting resistor 3 and the current-limiting resistor 3 are connected in series via a wiring pattern 7 is connected in parallel.

Lighting power supply 30 is connected to both ends of power supply wirings 5a and 5b to apply voltage and cause light emitting element 1 to emit light. Note that a DC power supply is used as the lighting power supply 30.
Also, the light emitting element 1 sealed in a plastic package
Is a rectangle, and the long sides of the rectangle are arranged in parallel with the arrangement direction, and the difference between the length N of the short side of the light emitting element 1 and the width M of the substrate 4 is made as small as possible.

FIGS. 6 and 7 show a second embodiment (claim 3) of an image reading light source according to the present invention, and are views showing a perspective external shape of a plastic package of the LED of the first embodiment. . The plastic packages 10 and 11 of the present invention shown in FIGS. 6 and 7 do not have ribs 12b parallel to the generatrix of the cylindrical lens 12a unlike the conventional plastic package shown in FIG. 10, and each has the cylindrical lenses 10a and 11a. Scattered light of the LED light-emitting chip in a region having a large angle from a direction perpendicular to the bus line is reduced,
The light-collecting performance is improved accordingly. Further, ribs 1 are provided at both ends of the plastic package 11 shown in FIG.
1b facilitates application to an automatic assembling apparatus.

FIGS. 2A and 2B are views for explaining a third embodiment (claim 4) of the image reading light source according to the present invention, wherein FIG. 2A is a plan view and FIG. (B) is a side view, in which 6 is a bar lens, 6a is a frame, and portions having the same functions as those shown in FIG. 1 are denoted by the same reference numerals. The LED chip 2 and the current limiting resistor 3 are arranged substantially in a line on the substrate 4, and power supply wirings 5 a and 5 b are arranged on both sides of the LED chip 2 and the current limiting resistor 3 in parallel with the arrangement direction. is there.

A DC lighting power source 30 (not shown) is connected to both sides of the power supply wires 5a and 5b, and a voltage is applied to cause the LED chip 2 to emit light. Further, bar lenses 6 are arranged in front of the LED chips 2, that is, in parallel with the rows of the LED chips 2 in the light emission direction, and are fixed on the substrate 4 by the frame 6 a. According to this method, the width M of the substrate 4 and the diameter D of the bar lens 6 can be made closer.

FIGS. 3A and 3B show a fourth embodiment of the image reading light source according to the present invention (claims 5 and 6).
1A is a plan view, FIG. 2B is a side view, and 8a and 8b are power supply wirings. The same signs are given. In the figure, the power supply wirings 8a and 8b
Is provided on the back surface. The LED chip 2 and the current limiting resistor 3 are arranged substantially in a line on the back surface of the substrate 4, and the power supply wirings 8 a and 8 b are provided on the back surface of the substrate 4 provided with the light emitting element 1 and the current limiting resistor 3. The LED chip 2, the current limiting resistor 3, and the power supply wirings 8a, 8b are connected (connected) substantially parallel to the arrangement direction.

Lighting power supply 30 (not shown) is connected to both ends of power supply wirings 8a and 8b to apply voltage and emit light. The lighting power supply 30 mainly uses a DC power supply. Further, a bar lens 6 is mounted on the frame 6 in front of the LED chip 2.
Arranged via a. According to this method, the width M of the substrate 4 can be made closer to the diameter D of the bar lens 6.

FIGS. 4A, 4B and 4C are diagrams for explaining a fourth embodiment (claims 5 and 6) of an image reading light source according to the present invention. (A) is a plan view, (b) is a back view, and (c) is a side view. In the drawings, the same reference numerals are given to the parts that operate in the same manner as in FIGS. In the figure, a light emitting element (a light emitting diode is sealed in a plastic package) 1 and a current limiting resistor 3 are mounted on a substrate 4.
Arranged almost in a row on the upper surface, the light emitting element 1 and
On the back surface of the substrate 4 on which the current limiting resistor 3 is provided, wirings 8a and 8b for power supply are provided in parallel with the arrangement direction. Lighting power supply 3 is provided at both ends of power supply wirings 8a and 8b.
0 (not shown) is connected to apply a voltage to emit light.
The lighting power supply 30 mainly uses a DC power supply.

Further, the light emitting element 1 having a rectangular planar shape and the long sides of the current limiting resistor 3 are arranged parallel to the arrangement direction, and the width M of the substrate 4 is made as small as possible. The power supply wirings 8a and 8b are connected to the wiring pattern 7 in which the current limiting resistor 3 and the light emitting element 1 are connected in series by forming patterns 7a and 7b at the end of the substrate 4 and connecting the patterns 7a and 7b. is there. With such a configuration, the substrate width M can be further reduced.

FIG. 5 is a view for explaining a fifth embodiment (claims 5 and 6) of an image reading light source according to the present invention, wherein 9a and 9b indicate power supply. The wiring for use 9c is a through-hole, and the same reference numerals are given to the portions that operate similarly to FIG. In the figure, a light emitting element 1 and a current limiting resistor 3 are arranged substantially in a row on a surface of a substrate 4, and a substrate 4 on which the light emitting element 1 and a current limiting resistor 3 are arranged
The power supply wirings 9a and 9b are arranged in parallel to the arrangement direction on the back surface of. Lighting power supplies 30 (not shown) are connected to both ends of the power supply wirings 9a and 9b to apply voltage and emit light. The lighting power supply 30 mainly uses a DC power supply. The light-emitting element 1 having a rectangular planar shape and the long side of the current limiting resistor 3 are arranged in parallel to the arrangement direction, and the width M of the substrate 4 is made as small as possible. The power supply wirings 9 a and 9 b are connected to the light emitting element 1 and the current limiting resistor 3 via a through hole 9 c provided in the substrate 4.

FIG. 8 is a view for explaining an image reading apparatus of the present invention using the image reading light source shown in FIGS. 1 to 5, wherein 14 is a 1: 1 sensor, 15 is a contact glass, Reference numeral 16 denotes a roller, reference numeral 17 denotes a frame, and reference numeral 13 denotes any one of the image reading devices of the present invention shown in FIGS.
Light source, 20 is a roof mirror lens array (RMLA),
21 is a lens array (LA), 22 is a diaphragm plate, 23 is a roof mirror array (RMA), and 24 is an optical path separating mirror (SM).

Roof mirror lens array (RMLA) 2
Numeral 0 denotes a lens array (LA) 21 having a plurality of lenses formed continuously, and a roof mirror array (RMA) 23 having a plurality of roof-shaped reflecting surfaces formed continuously at an arrangement pitch of the lens array (LA) 21. An aperture plate 22 having a structure for blocking stray light between adjacent lenses between the lens array (LA) 21 and the roof mirror array (RMA) 23 is formed on the lens array (LA) 21 and the roof mirror array (RMA) 23. A reference pin (not shown) and a member engaged and integrated with a reference hole (not shown) formed in the aperture plate 22, an optical path separating mirror (SM) 24, an LED illumination light source 13 shown in the figure, etc. The double sensor 14 is incorporated in a frame 17 and fixed. Further, a contact glass 15 is provided so that the original comes in close contact with the frame 17 when the original is pressed against the frame 17 by the roller 16 to constitute a 1: 1 sensor unit.

The illustrated roof mirror lens array (RML)
A) The 20 LED illumination light source 13 uses the image reading light source of the present invention shown in FIG. 1, but the other image reading light sources of the present invention shown in FIGS. It can be mounted with the dimensional arrangement of. When the LED illumination light source 13 is used as the image reading light source of the present invention, the difference between the width of the light emitting element 1 and the width of the substrate 4 is small and unnecessary space for illumination can be reduced, so that the conventional roof mirror lens array shown in FIG. (RMLA) can be downsized.

FIG. 9 is a view for explaining still another embodiment of the image reading apparatus according to the present invention. In the figure, reference numeral 19 denotes a gradient index rod lens array. The same signs are given. In the drawing, the LED illumination light source 13 and the equal-magnification sensor 14 are assembled and fixed in a frame 17 using a gradient index rod lens array 19 as an imaging element. Further, a contact glass 15 for closely attaching the document to the frame 17 is provided to form a 1: 1 sensor unit.

The LED illumination light source 13 uses the image reading light source of the present invention shown in FIGS.
Since the illumination light source 13 is small, the size of the unit magnification sensor unit can be reduced even in the configuration of the present embodiment.

[0032]

[Effect] As is clear from the above description, the following effects are obtained. (1) Advantages common to the first to sixth aspects: As a method of arranging the LED chips, by improving the wiring pattern of the substrate on which the LED chips are disposed, the width of the substrate can be reduced, and the size of the illumination light source can be reduced. Will be possible. (2) An effect corresponding to claim 3; by forming a cylindrical lens formed in an LED sealed with a transparent plastic package on almost the entire surface in the arrangement direction on the substrate, scattering in a region having a large divergence angle is achieved. And the light collection performance is improved. (3) Effects corresponding to claims 5 and 6: By providing wiring for supplying power to the LEDs on the back surface of the substrate, the width of the substrate can be further reduced, and the size of the illumination light source can be reduced. (4) The effect corresponding to claim 7; the use of an illumination light source having a reduced substrate width and a reduced volume ratio for image reading can reduce the size of the image reading apparatus.

[Brief description of the drawings]

FIG. 1 is a diagram for explaining a first embodiment of a light source for image reading according to the present invention.

FIG. 2 is a view for explaining a third embodiment of the image reading light source according to the present invention.

FIG. 3 is a view for explaining a fourth embodiment of the image reading light source of the present invention.

FIG. 4 is a view for explaining a fourth embodiment of the image reading light source of the present invention.

FIG. 5 is a view for explaining a fifth embodiment of the image reading light source of the present invention.

FIG. 6 is a diagram showing a perspective external view of a plastic package of an LED in a second embodiment of the image reading light source of the present invention.

FIG. 7 is a diagram showing another perspective external shape of the LED plastic package in the second embodiment of the image reading light source of the present invention.

FIG. 8 is a diagram for explaining an embodiment of the image reading apparatus of the present invention.

FIG. 9 is a view for explaining still another embodiment of the image reading apparatus of the present invention.

FIG. 10 is a view showing a perspective external shape of a conventional LED plastic package.

FIG. 11 is a diagram illustrating an example of a conventional image reading apparatus.

FIG. 12 is a diagram for explaining a conventional illumination light source using an LED array.

FIG. 13 is a diagram for explaining another conventional illumination light source using an LED array.

FIG. 14 is a view for explaining a conventional illumination light source.

[Explanation of symbols]

1. Light emitting element (LED; light emitting diode), 2. LED
Chip, 3 current limiting resistor, 4 substrate, 5a, 5b power supply wiring, 6 bar lens, 7 wiring pattern, 8
a, 8b: power supply wiring, 13: LED illumination light source, 1
4 ... 1: 1 sensor, 15 ... Contact glass, 16 ... Roller, 17 ... Frame, 20 ... Roof mirror lens array (RMLA), 21 ... Lens array (LA), 22 ...
Aperture plate, 23 ... Roof mirror array (RMA), 24 ...
Optical path separation mirror (SM)

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) H04N 1/04-1/207 H04N 1/024-1/036 G03B 27/52-27/56 G03B 27 / 66-27/70

Claims (7)

(57) [Claims] 1. A substantially linear shape on a substrate in a longitudinal direction of the substrate.
A light emitting element array comprising a plurality of light emitting elements provided in,
A current limiting resistor string comprising a plurality of current limiting resistors arranged to the light emitting element array and on substantially the same straight line, on both sides of the light emitting element array及<br/> beauty the current limiting resistor string, the light emitting element Row
And a micro-current limiting resistor string in parallel with the power supply wiring which is arranged
Become, the light emitting element to the power supply Kyuhai line and a current limiting resistor
A light source for image reading, wherein the light source is connected to a light source. 2. A substantially linear shape on a substrate in a longitudinal direction of the substrate.
And a light emitting element array including a plurality of light emitting elements sealed in a plastic package, and a plurality of current limiting resistors arranged on substantially the same straight line as the light emitting element array.
Current system Kiri抵 and anti columns, the light emitting element rows and the conductive <br/> Nagaresei Kiri抵 anti column light emitting element rows on both sides of and current limiting consisting
A resistor string and parallel disposed electrodeposition Minamotokyo Kyuhai line, the light emitting element rows and photoelectrically long side of the plastic package
The current limiting resistor is arranged in parallel with the
A light source for image reading , wherein a resistor is connected to the power supply wiring . 3. A substantially linear shape on a substrate in the longitudinal direction of the substrate.
And a light emitting element array including a plurality of light emitting elements sealed in a plastic package, and a plurality of current limiting resistors arranged on substantially the same straight line as the light emitting element array.
A current limit Kiri抵 anti sequence consisting, on both sides of the light emitting element rows and the conductive <br/> Nagaresei Kiri抵 anti column, the light emitting element array and the current system
And a power supply wiring disposed in parallel with the limiting resistor row, wherein the plastic package is
Plastic package which Ri Contact with the cylindrical lens is formed on the opposite surface, curved in a direction cylindrical lens is perpendicular to the array direction of the plastic package is formed on the entire surface Te
A cage with the long side of the plastic package in front
Arranged in parallel with the light emitting element row and the current limiting resistor row,
A light emitting element and a current limiting resistor are connected to the power supply wiring.
The image reading light source, characterized in that the. 4. A substantially linear shape on a substrate in a longitudinal direction of the substrate.
And sealed in a plastic package
Light emitting element array comprising a plurality of light emitting elements, and a plurality of current limiting resistors arranged on substantially the same straight line as the light emitting element row.
Current system Kiri抵 and anti columns, the light-emitting element array and the light emitting element rows and the current limiting on both sides of the current limiting resistor string consisting of
A resistor string and parallel disposed electrodeposition Minamotokyo Kyuhai line, wherein
It provided the condensing bar lens on the light emission side of the light emitting element of the substrate, and configured to substantially match the width of the substrate and diameter of the bar lens the condenser, and the light emitting element and a current limiting resistor
Is connected to the power supply wiring . 5. A substantially linear shape on a substrate in a longitudinal direction of the substrate.
A light emitting element array comprising a plurality of light emitting elements provided in,
A current limiting resistor string comprising a plurality of current limiting resistors arranged to the light emitting element array and on substantially the same straight line, the light emitting element Retsu及
And on the back side of the substrate on which the current limiting resistor row is disposed .
At both ends in the longitudinal direction of the substrate to the longitudinal direction of the substrate.
Other consists to the array direction parallel to disposed the power <br/> subjected Kyuhai line of the light emitting element array, and a current limiting resistor the light emitting element
An image reading light source connected to the power supply wiring . 6. A substantially linear shape on a substrate in a longitudinal direction of the substrate.
Provided, and a light-emitting element array comprising a plurality of light emitting element sealed in a plastic package, the light emitting element array and the plurality disposed on substantially the same straight line current limiting resistor
A current limiting resistor string comprising a resistor, the light emitting element row and the
Longitudinal direction of the back surface of the substrate on which the current limiting resistor array is provided
Connected in the vicinity of both side ends, it consists of a longitudinal direction or the light emitting element array and disposed parallel to the electrodeposition Minamotokyo Kyuhai line of the substrate, and a current limiting resistor and the light emitting element to the power supply wiring And the plastic package is
An image reading light source, wherein a width of a light emitting element sealed in a cage in a direction orthogonal to an arrangement direction is substantially equal to a width of the substrate. 7. A light source for image reading according to claim 1, comprising an image forming element having the same magnification, a sensor having a same magnification, and a frame holding each of these elements. Image reading device.