JPH11261761A - Contact type image sensor and information processor using it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an image sensor by miniaturizing a sensor array consisting of a light transmissive substrate by a smaller number of constituting parts by making an image forming element, which is for forming an image on a light receiving sensor by converging light from an original, abut on a sensor array mounting the light receiving sensor. SOLUTION: The sensor is constituted of a rod lens array 2 guiding reflected light from an original, the light transmissive substrate 10, a sensor chip 12 light-receiving light from the original transmitted through the array 2 and the substrate 10, a sensor array 19, etc., including the substrate 10 and the chip 12. Then, the substrate 10 is arranged to come in contact with the lower part of the array 2 and position the array 2 and is provided with a light emitting element 4 and an image sensor. The contact type image sensor is miniaturized in the direction of a thickness by positioning the rod lens array 2 as the image forming element by making the array 2 abut on the substrate 10 in this manner.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a contact type image sensor which can be used in, for example, a facsimile, a copying machine, a scanner, etc., and which reads light from a surface of a document to be read by a sensor, and an information processing apparatus using the same. It is about.

[0002]

2. Description of the Related Art As a document reading device used in a facsimile, a copying machine, a scanner, or the like, there is a contact type image sensor that forms a read image one-to-one using a sensor array and reads the same size as a read document. This contact type image sensor has a sensor substrate on which a plurality of sensor chips in which a plurality of pixels for performing photoelectric conversion are arranged and a protective film for protecting the plurality of sensor chips are mounted, and a light source for irradiating light to a document to be read. And a rod lens array, which is a lens for forming an image of a document to be read on the pixels of the sensor chip, and a cover glass that serves as a document reading surface.

FIG. 15 is a schematic perspective view showing the appearance of a conventional contact image sensor. Reference numeral 41 denotes a frame as a support, and reference numeral 45 denotes a cover glass as a transparent member capable of contacting the original and defining a reading surface thereof.

A plurality of optical sensors (pixels) are arranged along the longitudinal direction (main scanning direction) DM of the frame 41, and the short direction DS is the sub-scanning direction.

FIGS. 16 (a) through 16 (c) show FIG.
5 is a cross-sectional view taken along line BB ′ of FIG. In each of the drawings, a light source 3 for irradiating a document, a rod lens array 2 installed immediately below a document surface of a cover glass 1, a sensor chip 12, a sensor substrate 18,
It is constituted by a housing 9 for positioning and holding these. Further, the one shown in FIG. 16A has a bottom plate 8 attached via a spacer 6 and integrated with a housing 9. 16C, a light-transmitting substrate 10 is provided instead of the sensor substrate 18. 16A and 16B, the sensor substrate 1
8 and the sensor chip 12 constitute a sensor array 19;
A sensor array 19 is used in which the sensor chips 12 are arranged and connected by wire bonding after using the wiring substrate 18 made of ceramic or glass epoxy for the sensor substrate 18. Further, it has a frame form, a sensor substrate treatment, and other attached members that eliminate a stray light entrance path to the sensor light receiving portion due to external light and internal reflection.

In the contact type image sensor shown in FIG. 16C, instead of the sensor substrate 18, a light-transmitting substrate 10 made of, for example, glass is provided with electrically connectable wiring. A sensor array 12 is used in which a plurality of sensor chips for performing the above are mounted face-down on one line. In this embodiment, FIG.
16A and 16B, the path of stray light entering the sensor light receiving unit due to external light and internal reflection is eliminated by increasing the machining accuracy.

FIG. 17 shows another example of the contact type image sensor shown in FIG. First space 4 of frame 41
An imaging element 47 is arranged in 1A, and the imaging element 47 is composed of side plates 72 and 73 for enabling the lenses 71 to be formed in one or more rows of lens arrays. Second space 41B
Is provided with a light source 46. The light source 46 guides light from one or more LED light sources 63 in the main scanning direction DM and illuminates the document PP. The light guide plate 61 prevents light leaking from the light guide plate 61 and positions the light guide plate 61. And a housing 62 which is a frame member having a function of efficiently illuminating the original PP.

[0008] The first space 41A and the second space 41B communicate with each other. The sensor array 43 includes an electric circuit board 44
It is provided above and is arranged between the frame 41 and the frame 42 as the second support toward the third space 41C.

The method of assembling such an image sensor is performed as follows. That is, the light source 46 is fixed to the mounting surface 41D of the frame 41 with an adhesive or a screw, and the imaging element 47 is inserted into the first space 41A and fixed to the mounting surface 41E of the frame 41 with an adhesive 49 or a screw.

Then, the electric circuit board 44 on which the sensor array 43 is provided is
1 or the electric circuit board 44 provided with the sensor array 43 is fixed to the frame 41 with an adhesive or a screw.

[0011]

However, in the above-mentioned contact type image sensor, stray light 31 entering from the gap between the lens array and the frame as shown in FIG.
In order to prevent stray light 32 from the LED back surface and stray lights 33 and 34 entering from the end surface and the back surface of the sensor substrate, a gap is minimized by providing a barrier in the frame or by tightening dimensional accuracy. Due to the complicated and large-sized components such as these, the assemblability has also deteriorated. In addition, costs increased due to an increase in the number of parts such as a bottom plate and an anti-reflection treatment on the inner surface.

Due to these factors of stray light penetration, a sensor substrate, for example, as shown in FIG. 16 (c), provided with a wiring capable of being electrically connected to a light transmitting substrate such as glass, is used for photoelectric conversion. In a contact type image sensor equipped with a sensor array in which a plurality of sensor chips are mounted face-down on one line, the advantage of the light-transmitting substrate is disadvantageously disadvantageous.

In addition, the above-mentioned conventional example has the following technical problems to be solved in order to further develop and realize a compact product configuration which is the greatest advantage of the contact type image sensor in the future.

(1) In FIG. 17, as the size of the imaging element 47 is reduced in size, the application area of the adhesive 49 when the imaging element 47 is adhered and fixed to the frame 41 is reduced. Is difficult to apply, the adhesive penetrates into the surface of the image forming lens 71 to block the image forming optical path, and the light information from the document PP to the light receiving sensor 43 is interrupted, thereby deteriorating the image.

(2) The mounting position 41 of the imaging element 47 due to the work variation when the imaging element 47 is inserted into the first space 41A and fixed to the mounting surface 41E of the frame 41 with an adhesive.
There was a problem that there was a deviation from E and the image sharpness was degraded.

An object of the present invention is to provide a contact type image sensor in which a sensor array composed of a light transmitting substrate is reduced in size with fewer components.

Still another object of the present invention is to provide a contact type image sensor having a simple structure that does not receive stray light regardless of the assembly structure of the contact type image sensor.

[0018]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. According to the first aspect of the present invention, there is provided a contact-type image sensor, comprising: An imaging element for imaging light on the light receiving sensor; and a frame for positioning and holding the sensor array and the imaging element, wherein the imaging element is brought into contact with the sensor array. It is characterized by.

Further, in the contact type image sensor according to the present invention, a sensor array having a plurality of light receiving pixels and a plurality of light receiving pixels mounted face-down on one line on a light-transmitting substrate, and a document. A rod lens array for imaging light from, and a light source for illuminating the document,
A frame for positioning and holding the sensor array, the rod lens array, and the light source, wherein light is shielded in a region other than a region where the light receiving pixels of the sensor chip are mounted on the light transmitting substrate and an image forming region of the rod lens array. It is characterized by being covered with a layer.

Further, in the contact type image sensor according to the twelfth aspect, a transparent member capable of contacting the original to be read is provided;
A light source for irradiating the original with light through the transparent member, a sensor for receiving reflected light from the original, an imaging element for imaging the reflected light on a light receiving unit of the sensor, and the sensor, A frame for mounting the imaging element, the transparent member, and the light source; and an imaging element provided between the transparent member and the imaging element for positioning and supporting the imaging element on the frame. And a holding member.

According to another aspect of the present invention, there is provided a contact type image sensor, comprising: a sensor substrate on which a light receiving sensor is mounted; an image forming element for forming light from a document on the light receiving sensor; A frame for holding the imaging element, wherein the sensor substrate and the imaging element are in contact with each other.

An information processing apparatus according to a thirty-second aspect is a contact type image sensor for reading a document image and outputting an image signal, and for performing a predetermined process on an image signal output from the contact type image sensor. An information processing apparatus having a processing unit and a control unit for controlling the contact image sensor and the processing unit, wherein the contact image sensor includes a sensor substrate on which a light receiving sensor is mounted,
An imaging element for imaging light from a document on the light receiving sensor, and a frame for holding the sensor substrate and the imaging element, wherein the sensor substrate and the imaging element are in contact with each other. It is characterized by being.

A contact type image sensor according to claim 44, wherein: a light receiving sensor; a support member for supporting an original;
An image forming element for forming an image of light from the original on the light receiving sensor, a frame for holding the light receiving sensor, the image forming element, and the support member; and the support member and the image forming element. And an imaging element pressing member for positioning the imaging element with respect to the frame.

An information processing apparatus according to claim 50 is a contact type image sensor for reading an original image and outputting an image signal, and for performing a predetermined process on the image signal output from the contact type image sensor. An information processing apparatus having a processing unit and a control unit for controlling the contact type image sensor and the processing unit, wherein the contact type image sensor includes a light receiving sensor and a support member for supporting a document. An image forming element for forming an image of light from the original on the light receiving sensor, a frame for holding the light receiving sensor, the image forming element, and the support member; the support member and the image forming element And an imaging element pressing member for positioning the imaging element with respect to the frame.

[0025]

(First Embodiment) FIG. 1 is a sectional view of a contact type image sensor according to an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a cover glass made of a transparent glass material on which an original is placed, 2 denotes a rod lens array for guiding reflected light from the original, 3 denotes a light source for irradiating the original, and 4 denotes irradiation in the light source 3. A light emitting element such as an LED as a light source, 5 is a light guide plate for guiding irradiation light of the light emitting element 4 in the longitudinal direction (main scanning direction) and further condensing the light at a reading point of a document, 7 is a cover glass 1 and a rod lens array 2 Glue for bonding between 9
Is a housing of the contact type image sensor, 10 is a light transmitting substrate on which the light emitting element 4 and the image sensor are attached, and 11 is disposed so as to contact the lower part of the rod lens array 2 to position the rod lens array 2. Reference numeral 12 denotes a light-shielding layer for mainly covering a part having no components of the light transmitting substrate 10 and removing stray light. Reference numeral 12 denotes a sensor for receiving light from the rod lens array 2 and an original transmitted through the light transmitting substrate 10. A chip 13 is a light receiving portion provided in the sensor chip 12, a sealing and adhesive resin 14 covering the sensor chip 12, a sensor array 19 including the light transmitting substrate 10 and the sensor chip 12, and a close contact 20. A roller 21 for pressing the original 21 transferred relatively to the mold image sensor against the cover glass 1, and an original 21 from which an image is read.

As described above, in the present embodiment, by positioning the rod lens array 2 as an imaging element in contact with the light transmitting substrate 10, the contact type image sensor is downsized in the thickness direction. be able to.

The contact type image sensor will be described in more detail. More specifically, a plurality of sensor chips 12 for performing photoelectric conversion are mounted face-down on one line to provide wiring that can be electrically connected. It is. The light-transmitting substrate 10 has a light-shielding layer 11 formed by printing a black paint on areas other than the area on the original reflected light receiving section 13 of the sensor chip 12 to be mounted and the area below the light emitting section of the rod lens array 2. Unnecessary stray light entry can be removed. The light-shielding layer 11 may be a metal deposited film of aluminum or the like.

FIG. 2 is an excerpt of the sensor array 19. A light-shielding layer 11 is formed on the light-transmitting substrate 10 except for the light-receiving area (part) of the sensor chip 12 and the light-emitting area (part) from the rod lens array 2 by printing black paint or the like. Sensor chip 1 that performs photoelectric conversion on it
2 are mounted face-down such that the light-receiving portion 13 faces the light-transmitting substrate 10 on one line, thereby establishing electrical connection. Here, the area (part) of the light receiving part region is the light emitting part region (part).
Part).

(Second Embodiment) FIG. 3 is a sectional view of a contact type image sensor according to a second embodiment of the present invention. In FIG. 3, a sensor chip 1 for performing photoelectric conversion
2 are mounted face-down on one line, and the LED on the opposite side is a part of the light source 3.
It is also equipped with chip parts such as light emitting element 4
Wiring that can electrically connect them is provided. For example, as in the first embodiment, the light-transmitting substrate 10 made of glass or the like also has a plurality of sensor chips mounted on the light receiving section 13 for receiving reflected light from a document and an area below the light emitting section of the rod lens array 2. Other than the above, the light shielding layer 11 is formed by printing a black paint or the like. The light-shielding layer 11 may be applied to the outside of the sealing and adhesive resin 14, and may also be applied to the outside of the rod lens array 2 in a portion other than the light guide portion of the reflected light from the document 21.

(Third Embodiment) FIG. 4 is a sectional view of a contact type image sensor according to a third embodiment of the present invention.

In FIG. 4, in the contact type image sensor in which the frame 9 completely shields the end face of the sensor array 19 from the original 21, the joint surface between the light transmitting substrate 10 and the sensor chip 12 is separated from the original 21. A light-receiving portion for receiving the reflected light is arranged, and the area other than the area of the light-receiving section and the opposite side of the light-transmitting substrate 10 except for the area under the light emission of the rod lens array 2 is made of black paint. By printing or the like, it is possible to remove unnecessary stray light entering the light shielding layer 11 without processing the end face. The light-shielding layer 11 may be a metal deposited film of aluminum or the like.

(Fourth Embodiment) FIG. 5 is a sectional view of a contact type image sensor according to a fourth embodiment of the present invention.

In FIG. 5, the frame 9 completely shields the end face of the sensor array 19 from light, but cannot remove stray light from the document surface side (here, the gap between the rod lens array 2 (part A)). In the case of the contact type image sensor constituted by)), the mounting surface side of the light receiving portion of the sensor chip 12 of the light transmissive substrate 10 is in a region other than the region on the light receiving portion for receiving the reflected light from the original. The opposite surface of the light-transmitting substrate 10 is provided with a light-shielding layer 11 by printing a black paint only on the area where stray light enters except for the area under the light emission of the rod lens array 2 so that unnecessary stray light enters. Can be removed. The light-shielding layer 11 may be a metal deposited film of aluminum or the like.

(Fifth Embodiment) FIG. 6 is a sectional view of a contact image sensor according to a fifth embodiment of the present invention.

In FIG. 6, wirings which can be electrically connected by mounting a plurality of sensor chips 12 for performing photoelectric conversion face down on one line are provided. For example, a rod lens array 2 for imaging light from a document 21, a light source 3 for illuminating the document, and a cover for supporting the document on a sensor array 19 connected to a light-transmitting substrate 10 such as glass. The glass 1 and the frame 9 for positioning and holding them are of a close-contact type that is configured to completely shield the end face of the sensor array 19 from light and to completely shield stray light from the original surface. In the image sensor, the light-transmitting substrate 10 is unnecessary because the light-shielding layer 11 is formed on the surface of the sensor chip 12 on which the light-receiving portion is mounted, except for the region on the original reflected light-receiving portion by printing black paint. Stray light penetration can be eliminated. The light-shielding layer 11 may be a metal deposited film of aluminum or the like.

FIG. 7 shows a frame 9 in which stray light from the original side of the glass 1 is completely shielded and stray light such as external light is completely shielded by combination with the bottom plate 8. In a contact type image sensor, a light transmitting substrate 1
Reference numeral 0 indicates that the area other than the area on the original surface of the sensor chip 12 where the original reflected light is received is the light-shielding layer 11 formed by printing black paint or the like. Unnecessary stray light entry can be eliminated.

Although an example in which an LED is used as a light source has been described, for example, an EL may be used instead of the LED. FIG.
Reference numerals 9 to 22 denote EL (electrolumi) as light sources.
essence). 19 shows an example in which an array type EL light source 144 is used, FIG. 20 shows an example in which the EL light source 144 is arranged on the back surface of the cover glass 1, and FIG. 21 shows a case where the sensor 12 of the light transmitting substrate 10 which is a part of the sensor array is used. EL light source 14 on the same surface as the
FIG. 22 shows an EL light source 144 on the same surface of the light transmitting substrate 10 as the surface on which the sensor 12 is disposed.
This is an example in which the contact image sensor is further downsized by disposing the reflection mirror 102 and switching the optical path inside to arrange the sensor array 19 vertically. By using EL as a light source in this way, it is possible to further reduce the size of the contact image sensor.

(Sixth Embodiment) FIGS. 8 and 9 show the best features of the sixth embodiment. FIG. 8 shows an original PP of a transparent member 45 in contact with an original PP of a contact image sensor. 5 is a plan view as viewed from the reading surface side, and shows a position in the longitudinal direction DM of an imaging element pressing member 48 that presses an imaging element 47 that converges on the image sensor 43 through a transparent member 45 such as glass. The image forming element pressing member 48 presses the image forming element 47 at a plurality of positions with the frame 41 as a support. The same members as those in FIGS. 17 and 18 showing the conventional structure are denoted by the same reference numerals, and redundant description will be omitted.
FIG. 9 is a sectional view taken along the line AA 'in FIG.

In FIG. 9, the first space 4 of the frame 41
An imaging element 47 is disposed in 1A, and the imaging element 47 includes a lens 71 and side plates 72 and 73 that enable the lens 71 to be formed in one or more rows of lens arrays. The light source 46 is arranged in the second space 41B. Light source 46
Represents light from one or more LED light sources 63 in the main scanning direction DM.
A light guide plate 61 having a function of guiding the light to the document PP and illuminating the guided light in the direction of the document PP, and a function of preventing light leaking from the light guide plate 61 and determining the position of the light guide plate 61 to efficiently illuminate the document PP. The housing 62 is a frame material.

The first space 41A and the second space 41B communicate with each other. The sensor array 43 includes an electric circuit board 44
It is provided above and is arranged between the frame 41 and the frame 42 as a bottom plate of the second support toward the third space 41C.

The method of assembling such an image sensor is performed as follows. That is, the light source 46 is fixed to the mounting surface 41D of the frame 41 with an adhesive or a screw, and the imaging element 4
7 is inserted into the first space 41A and is brought into contact with the mounting surface 41E.
7 and the frame 41 with an adhesive 49 or a screw.
Fixed to.

Then, the electric circuit board 44 on which the sensor array 43 is provided is fixed to the frame 41 by the bottom frame 42, or the electric circuit board 44 on which the sensor array 43 is provided is fixed to the frame 41 by an adhesive or a screw. It is to fix.

In FIG. 9, the imaging element 47 is positioned and supported by being sandwiched between the frame 41 and the imaging element pressing member 48. The color of the imaging element pressing member 48 is black equivalent to that of the frame 41. The imaging element pressing member 48 is in contact with the side plate 73 constituting the imaging element 47 on the side where the light source 46 is not disposed, and the imaging element pressing member 48
Is fixed to the frame 41 with an adhesive 49.

At this time, the method of fixing the imaging element pressing member 48 to the frame 41 is not limited to the above, and a method of fixing the imaging element pressing member 48 and the frame 41 by engaging and disengaging hooks or press-fitting. The boss may be provided on the imaging element pressing member 48 or the frame 41 and fixed by press-fitting.

Further, the imaging element pressing member 48 is
The surface 81 in the thickness direction of the projecting portion that presses the upper portion 7 from the upper side in the direction of the imaging optical path (the vertical direction in FIG. 9) of the contacting portion has the image forming aperture angle 7 of the image forming element 47.
It has a shape that escapes from outside 4. This imaging aperture angle 74
Is a range for receiving the reflected light from the document PP.

In FIG. 8, the imaging element 47 is in the longitudinal direction D
At the center position and both ends of M, it is positioned and supported by being sandwiched between the frame 41 by the imaging element pressing member 48. At this time, the number of holding points in the longitudinal direction DM for holding the imaging element 47 may be one or more, and the whole area in the longitudinal direction may be held.

With such a configuration, (1) the imaging element 47 is sandwiched between the frame 41 and the imaging element pressing member 48 and positioned and supported, so that the positional deviation of the imaging element 47 due to work variation is reduced. It is possible to manage with the precision of the parts, and to improve and maintain the sharpness of the image.

(2) The imaging element pressing member 48 is connected to the frame 4
Since the imaging element 47 is fixed to the imaging element 47 by bonding with the adhesive 49, the application of the adhesive 49 to the imaging element 47 can be avoided. It is possible to solve the problem that the image optical path is blocked and the optical information from the document PP to the light receiving sensor is blocked, thereby deteriorating the image.

Also, by using the imaging element pressing member 48, it is possible to make contact with only the side plate 73 without covering the imaging lens 71 of the imaging element 47 by controlling the component dimensions of the imaging element pressing member 48. Therefore, the image forming optical path is blocked and the original PP
There is no need to worry about the problem that the optical information from the camera to the light receiving sensor 43 is blocked and the image is degraded.

(3) The color of the imaging element pressing member 48 is black, which can absorb light and suppress reflected light, and is the same color as the frame 41, so that the internal reflected light of the image sensor 43 is suppressed. In addition, the uniformity makes it possible to eliminate the influence on the image deterioration.

Further, the imaging element 4 of the imaging element pressing member 48
7. The surface 81 in the thickness direction in the direction of the imaging optical path of the portion in contact with 7 is released outside the imaging aperture angle 74 of the imaging element 47,
Evacuation of the surface 81 from the image forming area of the image forming element 7 can eliminate the influence on the image deterioration due to the internally reflected light.

In the above embodiment, as described in the first to fourth embodiments, the periphery of the image sensor 43 provided on the electric circuit board 44 and the frame 41
A light-shielding layer is applied to a third space 41C between the frame 41 and the frame 42 as a bottom plate of the second support to shield stray light not related to an image signal from the frame 41, so that the image sensor 43 receives reflected light. By using light only from the imaging element 47, a clear and high-contrast image signal can be obtained.

(Seventh Embodiment) FIG. 10 shows a seventh embodiment of the present invention.
1 is an embodiment of the present invention. In FIG. 10, an imaging element pressing member 48 is configured to be in contact with a transparent member 45 and an imaging element 47 that are in contact with a document PP that relatively moves with respect to an image sensor. The imaging optical path length between the transparent member 45 and the imaging element 47 has a focal length position TC at which the imaging element 47 can form an image, and a read position of the transparent member 45 at a position within the depth of field L. Manuscript P
The thickness that allows the surface that can contact P to be positioned is set.

The imaging element 47 is sandwiched between the transparent member 45 and the frame 41 of the supporting member in the direction of the imaging optical path via the imaging element pressing member 48, and the transparent member 45 is pressed while the imaging element 47 is pressed. The adhesive is fixed to the frame 41 and the imaging element 4
7 is fixed.

With such a configuration, the imaging element 4
7 is the component accuracy of the imaging element pressing member 48,
In addition, since it is determined by the component accuracy of the frame 41, the deviation from the mounting position 41E of the imaging element 47 due to the work variation is improved, and the problem of deteriorating the sharpness of the image can be solved.

Further, since the imaging element 47 is fixed in the step of fixing the transparent member 45, the assembling step can be simplified and the number of assembling steps can be reduced.

(Eighth Embodiment) FIG. 11 shows an eighth embodiment of the present invention.
1 is an embodiment of the present invention. In FIG. 11, the shape of the imaging element pressing member 48 that contacts the imaging element 47 and the shape that contacts the transparent member 45 are bilaterally symmetric when viewed from the cross-sectional direction. Imaging element pressing member 48
Has an arrow shape, the frame 41 and the upper part of the imaging element 47 abut at the bottom of the arrow of the imaging element pressing member 48, the transparent member 45 abuts on the upper part of the imaging element pressing member 48, and the adhesive 49.
It is fixed with adhesive.

With such a configuration, the process of assembling the imaging element pressing member 48 can be performed without restricting the mounting direction of the imaging element pressing member 48, and the assembling process can be simplified. Man-hours can be reduced.

(Ninth Embodiment) FIG. 12 shows a ninth embodiment of the present invention.
1 is an embodiment of the present invention. FIG. 12 is a sectional view of a reading portion of a flatbed image scanner as an information processing apparatus.

In FIG. 12, the original PP is read by moving the contact type image sensor with respect to the transparent member 51 which can support the original PP to be read by the flatbed type image scanner. I have.
The imaging element 47 is sandwiched between the frame 41 and the imaging element pressing member 48.
1 is fixed and fixed by an adhesive 49 so as to be positioned and supported.

The image forming element pressing member 48 is configured to contact the transparent member 51 and the image forming element 47, and the image forming element 4 is provided on the surface of the transparent member 51 which can contact the document PP to be read.
7, the focal length position TC at which imaging is possible is located, and the imaging optical path length between the transparent member 51 of the imaging element pressing member 48 and the imaging element 47 so as to fall within the range of the depth of field L. The thickness in the direction is set.

In this flatbed type image scanner, scanning in the DS direction is possible with the imaging element pressing member 48 in contact with the transparent member 51, and the material of the imaging element pressing member 48 is slidable. The molding resin material suitable for wear resistance is used.

By adopting such a configuration, even with a flatbed type image scanner, there is a problem that the position of the imaging element 47 is deviated due to a variation in work, thereby deteriorating the sharpness of the image. Can be solved, and the flatbed image sensor can be set at an appropriate position with respect to the reading surface of the transparent member 51 even when scanning the original.

(Tenth Embodiment) FIG. 13 shows an example of a facsimile having a communication function as an image information processing apparatus constituted by using the contact type image sensor unit 100 according to the present embodiment. Here, reference numeral 102 denotes a feeding roller as a feeding unit for feeding the document PP toward the reading position, and reference numeral 104 denotes a separating piece for reliably separating and feeding the document PP one by one. Reference numeral 106 denotes a platen roller which is provided at a reading position with respect to the sensor unit 100 and regulates a surface to be read of the document PP, and also serves as a conveyance unit for conveying the document PP. The sensor unit 100 is a contact image sensor according to each of the above embodiments,
A transparent member such as glass is arranged on the surface in contact with P,
The configuration is such that an image is read by a sensor unit using the reflected light of the document PP via an imaging element.

Reference numeral P denotes a recording medium in the form of a roll paper in the illustrated embodiment, in which image information read by the sensor unit 100 or, in the case of a facsimile apparatus or the like, image information transmitted from the outside is reproduced here. Then, it is recorded on a recording medium. Reference numeral 110 denotes a recording head as a recording unit for performing the image formation. Reference numeral 112 denotes a platen roller as a conveying unit that conveys the recording medium P to a recording position of the recording head 110 and regulates a recording surface thereof. is there.

Reference numeral 120 denotes an operation panel in which a switch for inputting an operation as input / output means, a message, and a display unit for notifying the status of the apparatus and the like are arranged. Reference numeral 130 denotes a system control board as a control unit, which controls a unit that configures the facsimile, a driving circuit for a light source and a photoelectric conversion element in the contact image sensor 100, and image information output from the image sensor. An image processing unit for performing predetermined signal processing, a transmission / reception unit for transmitting image information processed by the image processing unit to the outside and inputting image information received from the outside to the image processing unit are provided. 140 is a power supply of the apparatus. The drive circuit, the image processing unit, and the transmission / reception unit are controlled by the control unit.

FIG. 14 shows an example of a flat bed type image scanner as an image information processing apparatus constituted by using the contact type image sensor unit 100 according to the present embodiment. Here, 51 is a transparent member that can contact the document PP and defines a reading surface, 201 is a scanning belt as a feeding unit for mounting the sensor unit 100 and scanning in the scanning direction DS, and 202 is a scanning belt. Reference numeral 230 denotes a feed roller for driving the control unit. Reference numeral 230 denotes a system control board as control means. The control unit controls each unit of the image scanner.
A light source and a driving circuit for the photoelectric conversion element, an image processing unit for performing predetermined signal processing on image information output from the image sensor 100, image information processed by the image processing unit to the outside, and various kinds of external A transmission / reception unit or the like for inputting a command is provided. 240 is a power supply of the apparatus. The drive circuit, the image processing unit, and the transmission / reception unit are controlled by the control unit. The sensor unit 100 moves in the sub-scanning direction of the scanning belt with respect to the document PP arranged on the transparent member 51 of the flat bed type, reads one line in the main scanning direction in the depth direction in the drawing, and reads the document in the area area. Read the image. In the sensor unit 100, FIG.
Is scanned while contacting the transparent member 51, and the reflected light from the document PP is received by the line image sensor through the imaging element and converted into an image signal. Thereafter, the image signal is transmitted to the system control board 23.
0 to perform image signal processing and output to an external signal processing device.

The light-shielding layer described in the first to fourth embodiments and the imaging element pressing member for positioning and fixing the imaging elements described in the fifth to eighth embodiments are both a close contact type image sensor. , A synergistic effect can be achieved.

[0069]

According to the contact-type image sensor of the first and twentieth aspects and the information processing apparatus of the twenty-seventh aspect, the contact-type image sensor and the information processing apparatus using the same can be reduced in weight and size, and especially in thickness. It becomes possible to make it thin.

Further, according to the contact type image sensor of the present invention, it is possible to prevent light leaking into the sensor and eliminate the necessity of blocking a stray light entrance path by a frame form and other members, so that the degree of freedom of the shape is reduced. As a result, the number of components can be reduced, the cost can be reduced, the weight and size can be reduced, and the size of the device can be reduced.

Furthermore, according to the contact type image sensor according to the twelfth and thirty-eighth aspects of the present invention, the surface of the imaging element is prevented from being stained by an adhesive, for example. The deviation from the mounting position of the child is improved, and the image quality can be maintained without deteriorating the sharpness of the image.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a contact type image sensor configured according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a sensor array configured according to an embodiment of the present invention.

FIG. 3 is a cross-sectional view of a contact image sensor configured according to an embodiment of the present invention.

FIG. 4 is a cross-sectional view of a contact type image sensor according to an embodiment of the present invention.

FIG. 5 is a cross-sectional view of a contact type image sensor configured according to an embodiment of the present invention.

FIG. 6 is a sectional view of a contact type image sensor according to an embodiment of the present invention.

FIG. 7 is a sectional view of a contact type image sensor according to an embodiment of the present invention.

FIG. 8 is a plan view of the contact type image sensor of the present invention.

FIG. 9 is a sectional view taken along line AA ′ of FIG.

FIG. 10 is a cross-sectional view according to one embodiment of the present invention.

FIG. 11 is a cross-sectional view according to one embodiment of the present invention.

FIG. 12 is a sectional view of a flatbed image sensor according to an embodiment of the present invention.

FIG. 13 is a schematic cross-sectional view of an image information processing device of a contact type image sensor according to an embodiment of the present invention.

FIG. 14 is a schematic sectional view of an image information processing apparatus of a flat bed type image sensor according to an embodiment of the present invention.

FIG. 15 is a schematic perspective view of a conventional contact image sensor.

FIG. 16 is a cross-sectional view of a typical contact image sensor.

FIG. 17 is a sectional view taken along line BB ′ of FIG. 17;

FIG. 18 is a diagram showing a typical stray light entry path.

FIG. 19 is a sectional view of a contact type image sensor according to an embodiment of the present invention.

FIG. 20 is a sectional view of a contact type image sensor according to an embodiment of the present invention.

FIG. 21 is a sectional view of a contact type image sensor according to an embodiment of the present invention.

FIG. 22 is a sectional view of a contact type image sensor according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cover glass 2 Rod lens array 3 Light source 4 Light emitting element such as LED 5 Light guide plate 6 Spacer 7 Adhesive 8 Bottom plate 9 Housing 10 Light transmitting substrate 11 Light shielding layer 12 Sensor chip 13 Light receiving unit 14 Sealing and adhesive resin 18 Sensor substrate 19 Sensor Array 20 Roller 21 Document 41 First Frame 42 Second Frame 43 Sensor Array 44 Electric Circuit Board 45 Transparent Member 46 Light Source 47 Imaging Element 48 Imaging Element Pressing Member 49 Adhesive 51 Transparent Member 61 Light Guide Plate 62 Housing 63 LED Light source 71 Image forming lens 72, 73 Side plate 74 Opening angle of image forming element 81 Surface of image forming element pressing member in direction of image forming optical path 100 Sensor unit 102 Feeding roller 104 Separating piece 106 Platen roller 110 Recording head 112 Platen roller 120 operation Flannel 130 System control board 140 Power supply 200 Sensor unit 201 Scanning belt 202 Feed roller 230 System control board 240 Power supply 41A First space 41B Second space 41C Third space 41D Light source mounting surface 41E Imaging element mounting surface TC Focal length L Subject Depth of field PP Document P Recording medium DM Frame longitudinal direction DS Frame lateral direction

Claims (55)

[Claims] A sensor array on which a light receiving sensor is mounted;
An image forming element for forming an image of light from a document on the light receiving sensor; and a frame for positioning and holding the sensor array and the image forming element. The image forming element is brought into contact with the sensor array. A contact type image sensor characterized in that the contact is made. 2. The contact type image sensor according to claim 1, wherein said sensor array is formed of a light-transmitting substrate. 3. The contact-type image sensor according to claim 2, wherein the imaging element is arranged on a side opposite to the sensor chip mounting surface with the light-transmitting substrate interposed therebetween. Sensor. 4. The contact image sensor according to claim 2, wherein a light shielding layer is provided on the light transmitting substrate. 5. The contact-type image sensor according to claim 4, wherein a light-shielding layer is provided in a region of the light-transmitting substrate other than the image-forming region of the image-forming element. 6. The contact type image sensor according to claim 1, wherein the imaging element is a rod lens. 7. A sensor array in which a plurality of sensor chips each having a plurality of light receiving pixels are mounted face-down on one line on a light-transmitting substrate, and a rod lens array for imaging light from a document. A light source for illuminating the document, a frame for positioning and holding the sensor array, the rod lens array, and the light source, and a region on the light transmissive substrate where light receiving pixels of the sensor chip are mounted; and A contact-type image sensor, wherein the light-shielding layer covers an area other than the image forming area of the rod lens array. 8. The contact type image sensor according to claim 7, wherein the rod lens array is arranged on a side opposite to a surface on which light receiving pixels of the sensor chip are mounted with the light transmitting substrate interposed therebetween. Characteristic contact type image sensor. 9. The contact-type image sensor according to claim 8, wherein the light-shielding layer of the light-transmitting substrate is provided with a light-receiving pixel of the sensor chip based on an area of an incident area of the rod lens array for image-forming light. The contact type image sensor, characterized in that the area of the region is small. 10. The contact type image sensor according to claim 8, wherein a light-shielding layer of the light-transmitting substrate has a space between the light-emitting surface of the rod lens array and the light-transmitting substrate. A contact type image sensor characterized by the following. 11. An information processing apparatus comprising: the contact type image sensor according to claim 8; and means for supporting the document on a document reading surface of the contact type image sensor. apparatus. 12. A transparent member capable of contacting a document to be read, a light source for irradiating the document with light through the transparent member, a sensor for receiving light reflected from the document, and a light receiving portion of the sensor. An imaging element for imaging the reflected light;
A frame for mounting the sensor, the imaging element, the transparent member, and the light source; and a frame provided between the transparent member and the imaging element, for positioning and supporting the imaging element on the frame. And a contact-type image sensor comprising: 13. The thickness of the imaging element holding member in the optical path length direction between the transparent member and the imaging element is set within the focal length position at which the imaging element can form an image and the depth of field. The thickness of the transparent member is set such that the surface of the transparent member that can contact the document to be read is positioned, and the imaging element pressing member is moved between the transparent member and the imaging element. The contact type image sensor according to claim 12, wherein the contact type image sensor is configured to be in contact with an image element. 14. The fixing of the imaging element includes sandwiching the imaging element between the support member and the imaging element pressing member in an imaging optical path direction, and fixing the imaging element pressing member to the frame. 13. The contact type image sensor according to claim 12, wherein: 15. The fixing of the image forming element includes sandwiching the image forming element in the direction of an image forming optical path with the transparent member via the support member and the image forming element pressing member, and attaching the transparent member to the frame. 13. The image forming device according to claim 12, wherein the image forming device is fixed by bonding or fixing, or by bonding and fixing the transparent member including the image forming device holding member to the frame. The contact type image sensor described in the above. 16. The imaging element pressing member has a black color equivalent to that of the frame, and a portion where the imaging element pressing member is in contact with the imaging element is provided on the side where the light source is not disposed. Within the thickness of the side plate constituting the image element,
In the longitudinal direction of the imaging element, it is characterized in that it is from one or more point holders to an entire area in the longitudinal direction, and a surface of the imaging element holder that is in the direction of an imaging optical path between the transparent member and the imaging element. 13. The contact type image sensor according to claim 12, wherein the position is set outside the aperture angle of the imaging element. 17. The contact-type image sensor according to claim 12, wherein a light-shielding layer is applied to a portion of the substrate on which the light-receiving sensor is mounted, except for a light-receiving portion of the sensor. Contact image sensor. 18. The contact type image sensor according to claim 12, wherein the imaging element pressing member is in contact with a transparent member capable of contacting the original to be read, and the image forming element pressing member is attached to a surface of the transparent member capable of contacting the original to be read. The focal length position where the image of the image element can be formed, and the position of the depth of field in the direction of the imaging optical path length direction between the transparent member and the imaging element of the imaging element pressing member so as to be positioned. A contact-type image sensor having a set thickness. 19. An information processing apparatus comprising the contact image sensor according to claim 12. 20. A sensor board having a light receiving sensor mounted thereon,
An imaging element for imaging light from a document on the light receiving sensor, and a frame for holding the sensor substrate and the imaging element, wherein the sensor substrate and the imaging element are in contact with each other. A contact type image sensor. 21. The contact type image sensor according to claim 20, wherein the sensor substrate is formed of a light transmitting substrate. 22. The contact image sensor according to claim 21, wherein the light transmitting substrate has a light shielding layer. 23. The contact-type image sensor according to claim 21, wherein the imaging element is arranged on a side opposite to the sensor chip mounting surface with the light transmitting substrate interposed therebetween. 24. The contact image sensor according to claim 23, wherein the light-transmitting substrate has a light-shielding layer. 25. The contact type image sensor according to claim 24, wherein an image forming area of the image forming element on the light transmitting substrate is not covered with the light shielding layer. 26. The contact type image according to claim 24, wherein a region of the light transmitting substrate on which the light receiving sensor is mounted and an image forming region of the image forming element are not covered with the light shielding layer. Sensor. 27. The light-shielding layer according to claim 26, wherein the light-shielding layer is formed such that an area of a region where the light-receiving pixels of the light-receiving sensor are mounted is smaller than an area of an image-forming region of the image-forming element. Contact type image sensor. 28. A contact image sensor according to claim 20, wherein said imaging element is a rod lens. 29. The contact image sensor according to claim 20, further comprising a light source for illuminating the document. 30. The light source according to claim 29, wherein the light source is LE.
D. a contact image sensor. 31. The light source according to claim 29, wherein the light source is an EL.
A contact type image sensor characterized by the following. 32. A contact image sensor for reading a document image and outputting an image signal, processing means for performing predetermined processing on an image signal output from the contact image sensor, and the contact image sensor And a control unit for controlling the processing unit, wherein the contact-type image sensor forms a light on a sensor substrate on which a light receiving sensor is mounted and light from a document on the light receiving sensor. An information processing apparatus, comprising: an image forming element for mounting the image sensor; and a frame for holding the sensor substrate and the image forming element, wherein the sensor substrate and the image forming element are in contact with each other. 33. An information processing apparatus according to claim 32, wherein said sensor substrate is formed of a light-transmitting substrate. 34. The information processing apparatus according to claim 33, wherein the light transmitting substrate has a light shielding layer. 35. The information processing apparatus according to claim 33, wherein the imaging element is disposed on a side opposite to the sensor chip mounting surface with the light transmitting substrate interposed therebetween. 36. The information processing apparatus according to claim 35, wherein the light transmitting substrate has a light shielding layer. 37. The information processing apparatus according to claim 36, wherein an imaging region of the imaging element on the light transmitting substrate is not covered with the light shielding layer. 38. The information processing apparatus according to claim 36, wherein a region of the light transmitting substrate on which the light receiving sensor is mounted and an image forming region of the image forming element are not covered with the light shielding layer. . 39. The light-shielding layer according to claim 38, wherein the light-shielding layer is formed such that the area of a region where the light-receiving pixels of the light-receiving sensor are mounted is smaller than the area of the image-forming region of the image-forming element. Information processing device. 40. An information processing apparatus according to claim 32, wherein said imaging element is a rod lens. 41. An information processing apparatus according to claim 32, wherein said contact image sensor further includes a light source for illuminating said document. 42. The light source according to claim 41, wherein the light source is LE.
D. an information processing apparatus, 43. The light source according to claim 41, wherein the light source is an EL.
An information processing apparatus, characterized in that: 44. A light receiving sensor, a support member for supporting a document, an image forming element for forming light from the document on the light receiving sensor, the light receiving sensor, the image forming element, A frame for holding a support member, and an imaging element pressing member provided between the support member and the imaging element for positioning the imaging element with respect to the frame. Contact type image sensor. 45. The contact-type image sensor according to claim 44, wherein the imaging element is positioned by being sandwiched in the imaging optical path direction with respect to the frame by the imaging element pressing member. . 46. The contact-type image sensor according to claim 44, wherein the support member is adhered and fixed to the frame. 47. The contact type image sensor according to claim 46, wherein the support member including the imaging element pressing member is adhered and fixed to the frame. 48. The contact type image sensor according to claim 44, wherein the imaging element pressing member is positioned outside an opening angle of the imaging element. 49. The imaging device according to claim 44, wherein the supporting member of the imaging element pressing member and the imaging element are positioned such that the document supporting surface of the supporting member is located within the depth of field of the imaging device. A contact type image sensor, wherein a thickness in the optical path length direction is set between the support members and the image forming element. 50. A contact image sensor for reading a document image and outputting an image signal, processing means for performing predetermined processing on an image signal output from the contact image sensor, and the contact image sensor And an information processing apparatus having control means for controlling the processing means, wherein the contact image sensor includes a light receiving sensor,
A support member for supporting the original, an imaging element for imaging light from the original on the light receiving sensor, and a frame for holding the light receiving sensor, the imaging element, and the support member; An information processing apparatus provided between the support member and the imaging element, the imaging element pressing member for positioning the imaging element with respect to the frame. 51. The information processing apparatus according to claim 50, wherein the imaging element is positioned by being sandwiched in the imaging optical path direction with respect to the frame by the imaging element pressing member. 52. An information processing apparatus according to claim 50, wherein said support member is fixedly adhered to said frame. 53. An information processing apparatus according to claim 52, wherein said support member including said imaging element pressing member is adhered and fixed to said frame. 54. The information processing apparatus according to claim 50, wherein the imaging element holding member is positioned outside an opening angle of the imaging element. 55. The image forming device according to claim 50, wherein the supporting member of the image forming element pressing member and the image forming element are positioned such that the document supporting surface of the support member is located within the depth of field of the image forming element. An information processing apparatus, wherein a thickness in an optical path length direction is set, and the imaging element pressing member is in contact with the support member and the imaging element.