JP2000036888A - Image read/write integrated head and image processor provided with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the productivity without damaging the function of an image read/write integrated head, to incorporate the image read/write integrated head in an image processor and to perform miniaturization at the time of actually using it. SOLUTION: This head is provided with plural photodetectors 20, provided with plural light receiving surfaces 20a and loaded on one surface 4a of a substrate 4 so as to array the plural light receiving surfaces 20a into columnar shapes, a case 1 provided on the substrate 4 so as to surround the plural photodetectors 20 for forming an optical path 14a for leading light emitted from a light source 3 to an image read object area S, a lens 5 capable of converging the light reflected from the image read object area S on the respective light receiving surfaces 20a and plural elements 8 for printing loaded on a part projected from the case 1 on one surface 4a of the substrate 4 in the columnar shape. Furthermore, the lens 5 is inclined to the respective light receiving surfaces 20a and the width in a sub scanning direction of the respective light receiving surfaces 20a has a dimension larger than the array pitch in the main scanning direction of the respective light receiving surfaces 20a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an integrated image reading / writing head having both an image reading function and an image forming function, and an image processing apparatus having the same.

[0002]

2. Description of the Related Art An image processing apparatus such as a facsimile apparatus needs to have both an image reading function and an image forming function. In addition, it is necessary to respond to the demand for downsizing the image processing apparatus. Therefore, conventionally, there is an integrated image reading / writing head H as shown in FIG. The conventional integrated head for image reading and writing H includes a case 1e having a transparent cover 19e mounted on an upper surface thereof, and a substrate 4e mounted on the bottom of the case 1e. A plurality of light receiving elements 2e and a plurality of heating elements 8 for printing are provided on both front and back surfaces of the substrate 4e.
e are mounted in a row extending in the longitudinal direction of the substrate 4e. A light source 3e and a condensing lens 5e are provided inside the case 1e. Light emitted from the light source 3e is applied to an image reading target area Se on the surface of the transparent cover 19e. The light reflected from the image reading target area Se is transmitted to the lens 5e.
Through the light receiving surfaces (not shown) of the plurality of light receiving elements 2e.

The integrated image reading / writing head H can read an image of the document D arranged in the image reading target area Se by using the light source 3e and the plurality of light receiving elements 2e. On the other hand, a desired image can be printed out on, for example, a heat-sensitive recording paper K using the plurality of heating elements 8e.

[0004]

However, the conventional image reading / writing integrated head H has the following disadvantages.

That is, the conventional image reading / writing integrated head H has a plurality of light receiving elements 2e mounted on the front surface 40 of the substrate 4e, whereas a plurality of heating elements 8e are mounted on the back surface 41 of the substrate 4e. ing. For this reason, at the time of the component mounting work on the substrate 4e, first, the plurality of light receiving elements 2e are mounted on the surface 40 of the substrate 4e,
In order to mount the plurality of heating elements 8e on the back surface 41 of the substrate e, it is necessary to turn the substrate 4e upside down. After inverting the substrate 4e, it is necessary to accurately reposition the substrate 4e to a desired position again. Therefore, these operations have been complicated. Further, it is necessary to previously form two types of wiring patterns related to the plurality of light receiving elements 2e and the plurality of heating elements 8e on the substrate 4e. The work of individually forming each of the two surfaces 40 and 41 is also complicated. As a result, in the conventional image reading and writing integrated head H,
The productivity was bad.

Furthermore, conventionally, when actually manufactured the image processing apparatus using the above image write integral head H is located above the image read-write integral head H for the platen roller P ₁ for feeding the document D you need to respect, it is necessary to arrange below the image read-write integral head H for the platen roller P ₂ for sending the recording sheet K. Therefore, the two platen rollers P ₁ and P ₂
The entire mechanism combining the image reading and writing head H is bulky and bulky in the height direction, and there is room for improvement in terms of downsizing.

The present invention has been conceived in view of the above circumstances, and enhances the productivity of the integrated image reading / writing head without impairing the function of the integrated image reading / writing head. It is an object of the present invention to reduce the size of an image processing apparatus when it is actually used.

[0008]

DISCLOSURE OF THE INVENTION In order to solve the above problems, the present invention employs the following technical means.

That is, according to a first aspect of the present invention, there is provided an integrated image reading / writing head. The integrated image reading / writing head has a plurality of light receiving surfaces, and a plurality of light receiving elements mounted on one surface of the substrate such that the plurality of light receiving surfaces are arranged in a row, and the plurality of light receiving elements. A case that is provided on the substrate so as to surround and forms an optical path for guiding light emitted from a light source to an image reading target area, and light reflected from the image reading target area can be focused on each of the light receiving surfaces. Lens, and a plurality of printing elements mounted in a row on a portion of the one surface of the substrate protruding from the case, and the lens is inclined with respect to each of the light receiving surfaces. The width of each light receiving surface in the sub-scanning direction is larger than the arrangement pitch of each light receiving surface in the main scanning direction.

According to a second aspect of the present invention, there is provided an integrated image reading / writing head. The integrated image reading / writing head has a plurality of light receiving surfaces, and a plurality of light receiving elements mounted on one surface of the substrate such that the plurality of light receiving surfaces are arranged in a row, and the plurality of light receiving elements. A case that is provided on the substrate so as to surround and forms an optical path for guiding light emitted from a light source to an image reading target area, and light reflected from the image reading target area can be focused on each of the light receiving surfaces. Lens and the one side of the substrate,
A plurality of printing elements mounted in a row at a portion protruding from the case, and the lens is inclined with respect to each of the light receiving surfaces, and a sub-scan of each of the light receiving surfaces is provided. The width L in the direction is characterized by L> p ′ · m (where p ′ is the minimum image reading pitch in the sub-scanning direction and m is the image magnification of the lens). .

The integrated image reading / writing head provided by the first and second aspects of the present invention has the following effects.

First, according to the present invention, since a plurality of light receiving elements and printing elements are mounted on the same surface of a substrate, when manufacturing the same, the substrate is turned upside down unlike the conventional case. In addition, a plurality of light receiving elements and printing elements can be mounted on the substrate. In addition, since the wiring pattern related to the light receiving element and the printing element may be formed on the same surface of the substrate, the wiring pattern can be formed at the same time. Therefore,
According to the present invention, the productivity of the integrated image reading / writing head can be increased as compared with the related art.

Second, according to the present invention, it is possible to easily provide an image reading target area on the same side of the front and back sides of the substrate as the one side on which the printing element is mounted on the substrate. A platen roller for transferring a document to a reading target area and a platen roller for transferring a recording sheet to a mounting portion of a printing element can be arranged on the same surface side of the substrate. For this reason, in the present invention, the size of the entire image reading / writing head can be made large and not bulky as compared with the conventional one in which two platen rollers need to be arranged on both sides of the head so as to sandwich the image reading / writing integrated head. I can do it.

Third, in the present invention, since the lens is inclined with respect to each light receiving surface of the plurality of light receiving elements mounted on the substrate, for example, this lens is mounted on a case. Also, it is possible to increase the optical path length from the image reading target area to each of the light receiving surfaces without significantly increasing the size of the case in the thickness direction.
Therefore, a lens having a large depth of focus can be used as the lens. As a result, for example, even when the document slightly rises above the image reading target area, it is possible to read the image so as not to cause so-called out-of-focus or in a state where the out-of-focus is small, and the quality of the read image is improved. Can be increased.

Fourth, according to the present invention, it is possible to prevent the amount of light received on each light receiving surface of the plurality of light receiving elements from being reduced, and to obtain a high quality read image. That is, in the conventional image reading / writing integrated head, since the lens is not inclined with respect to each light receiving surface of the plurality of light receiving elements, light passing through the lens travels substantially perpendicular to each light receiving surface. In such a conventional configuration, the width of each light receiving surface in the sub-scanning direction must be adjusted in order to uniformly read the original image line by line while maintaining uniform reading densities in the main scanning direction and the sub-scanning direction. It was necessary to make the dimensions smaller than the image reading pitch. Conventionally, if the width of each light receiving surface in the sub-scanning direction is made larger than the image reading pitch in the main scanning direction, the light receiving surface of the light receiving element is required when the reading densities in the main scanning direction and the sub scanning direction are made uniform. This also receives light that travels from an area wider than the original image reading width on the surface of the original, so that proper image reading cannot be performed. Conventionally,
Even if the reading density in the main scanning direction and the reading density in the sub-scanning direction are not uniform, in order to properly read the original image, the width of each light receiving surface in the sub-scanning direction must be
L ≦ p ′ · m (p ′ is the minimum image reading pitch in the sub-scanning direction, and m is the image magnification of the lens). In the related art, if the relationship of L> p ′ · m is satisfied, light traveling from an area wider than the original image reading width on the surface of the original is unduly received. On the other hand, in the present invention, since the lens is inclined with respect to each of the light receiving surfaces, each light receiving surface receives the light passing through the lens in an oblique direction instead of vertically. Therefore, if the width of each light receiving surface in the sub-scanning direction is set to the same size as the conventional one, the amount of light received on each light receiving surface is reduced, and the image quality is reduced. However, in the present invention, the width L of each light receiving surface in the sub-scanning direction is set to be larger than the arrangement pitch of each light receiving surface in the main scanning direction (this arrangement pitch corresponds to the reading pitch in the main scanning direction). Alternatively, by setting L> p ′ · m, the light receiving amount on each light receiving surface can be increased and the quality of the read image can be appropriately prevented from being reduced because the light receiving surface is larger than the conventional one. is there.

In a preferred embodiment of the present invention, the width L of each of the light receiving surfaces in the sub-scanning direction has a relation of L ≦ p · secθ, more precisely, a relation of p <L ≦ p · secθ (however, p is the array pitch of each of the light receiving surfaces in the main scanning direction, and θ is the angle of inclination of the lens with respect to a vertical line of each of the light receiving surfaces.)

According to this configuration, of the light reflected by the document and traveling to each light receiving surface via the lens, the arrangement pitch in the main scanning direction of the light receiving surface in the sub-scanning direction of the document surface is the same as that of the light receiving surface. Only light reflected from an area smaller than the width can be appropriately received on each light receiving surface. Therefore, it is possible to prevent the light receiving surface from unduly receiving the reflected light from the portion that is not the image reading target, which is more preferable in avoiding deterioration of the quality of the read image.

In another preferred embodiment of the present invention,
The light source is mounted on one side of the substrate.

According to such a structure, in addition to a plurality of light receiving elements and printing elements, a light source can be mounted on the same surface of the substrate, so that the manufacture of an integrated image reading and writing head is further facilitated. Productivity can be further improved.

According to a third aspect of the present invention, there is provided an image processing apparatus. This image processing apparatus is characterized in that it has an integrated image reading / writing head provided by the first aspect or the second aspect of the present invention.

According to the third aspect of the present invention, it is possible to expect the same effects as obtained by the first and second aspects of the present invention, and to cause a problem in image reading processing and the like. Therefore, the productivity can be improved and the overall size can be reduced.

[0022] Other features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be specifically described below with reference to the drawings.

FIG. 1 is a perspective view showing an example of an integrated image reading / writing head according to the present invention. FIG. 2 is a cross-sectional view of FIG.
It is II sectional drawing. FIG. 3 is an exploded perspective view of the image reading / writing integrated head shown in FIG. FIG. 4 is a plan view of a sensor IC chip used in the integrated image reading / writing head shown in FIG.

As best seen in FIGS. 2 and 3,
The image reading / writing integrated head A according to the present embodiment includes a case 1,
Transparent cover 19, lens array 5, substrate 4, heat sink 7,
And other components described below.

The substrate 4 is made of, for example, ceramic and has a rectangular plate shape in a plan view. A plurality of light sources 3 and a plurality of sensors I are provided on a surface 4 a (one side) of the substrate 4.
The C chip 2, the plurality of driving ICs 80, and the plurality of heating elements 8 are mounted.

The plurality of light sources 3 are configured using, for example, LED chips, and are mounted in rows at appropriate intervals in the longitudinal direction of the substrate 4. The plurality of sensor IC chips 2 are semiconductor chips in which a plurality of light receiving elements 20 each having a light receiving surface 20a are integrally formed, and the substrate 4 is arranged so as to be substantially parallel to the plurality of light sources 3.
Are mounted in a row in the longitudinal direction. The arrangement direction of the plurality of sensor IC chips 2 (strictly speaking, the plurality of light receiving surfaces 20
a) is the main scanning direction. The detailed configuration of the plurality of sensor IC chips 2 and the plurality of light receiving elements 20 built therein will be described later.

The plurality of heating elements 8 correspond to an example of a printing element according to the present invention. Each of the heating elements 8 forms a linear heating resistor extending continuously in the longitudinal direction of the substrate 4 by printing and baking a thick film resistor paste containing, for example, ruthenium oxide as a conductor component. The resistor is formed by forming a wiring pattern that electrically divides the resistor at regular intervals along its longitudinal direction. The plurality of driving ICs 80
Are for controlling the driving of heating of the plurality of heating elements 8, and are also mounted in rows in the longitudinal direction of the substrate 4 at appropriate intervals. The plurality of heating elements 8
Is disposed at one side edge 4c extending in the longitudinal direction of the substrate 4 or in the vicinity thereof. On the surface 4a of the substrate 4,
Wiring patterns (not shown) associated with the plurality of light sources 3, the plurality of sensor IC chips 2, the plurality of drive ICs 80, and the plurality of heating elements 8 are formed. One or a plurality of connectors (not shown) electrically connected to each of the wiring patterns are provided at appropriate places on the substrate 4. By connecting wires to these connectors, power can be supplied from an external device to the above-described units and various kinds of connectors can be provided. Signal can be input and output.

The case 1 is made of a synthetic resin, and its overall length in the longitudinal direction is substantially the same as that of the substrate 4. FIG.
This case 1 is mounted on the surface 4a of the substrate 4 so as to surround each of the plurality of light sources 3, the plurality of sensor IC chips 2, and the plurality of drive ICs 80. . The case 1 has a hole 10 penetrating in the thickness direction of the case 1 and a concave portion 11 formed at the bottom of the case 1.
The plurality of light sources 3 are arranged at the bottom in the area 0. The plurality of sensor IC chips 2 and the driving IC 80 are arranged in the recess 11. One side edge 4 of the substrate 4
c and the vicinity thereof protrude to one side of the case 1, and the plurality of heating elements 8 are located at the protruding portions. Case 1 width direction (transverse direction)
Of the two side surfaces, the side surface 1a on the side approaching the plurality of heating elements 8 is inclined so as to approach the other side edge portion 4d of the substrate 4 as it goes above the case 1.

The transparent cover 19 is for guiding the document D to be read, and is, for example, a transparent glass or synthetic resin plate. A fixed linear area extending in the main scanning direction on the surface of the transparent cover 19 is an image reading target area S. The transparent cover 19 is attached to the case 1 by, for example, being fitted into the recess 13 on the upper surface of the case 1. However, the upper surface of the case 1 is inclined,
Accordingly, the transparent cover 19 is also inclined. More specifically, the transparent cover 19 is inclined such that its height decreases as it approaches the other side edge 4d of the substrate 4.

Inside the case 1, a first optical path 14a and a second optical path 14b for guiding the light emitted from the light source 3 are provided. The first optical path 14a
Is an optical path for guiding the light emitted from the plurality of light sources 3 to the image reading target area S, and is formed by the hole 10. On the other hand, the second optical path 14b is
This is an optical path that travels along the first optical path 14a and guides the light reflected by the document surface located in the image reading target area S onto each of the light receiving surfaces 20a of the plurality of light receiving elements 20. The first optical path 14a is substantially perpendicular to the surface 4a of the substrate 4, while the second optical path 14b is in the sub-scanning direction such that the lower the lower, the closer to one side edge 4c of the substrate 4. It is inclined along.

The lens array 5 is connected to the second optical path 1
4b, a concave groove 12 provided in the case 1 such that an upper end thereof faces the image reading target area S and a lower end thereof faces the plurality of light receiving surfaces 20a. It is fitted and attached to. In the lens array 5, a plurality of rod lenses 51 are held in a row on a block-shaped lens holder 50 extending in the main scanning direction. If the rod lens 51 is used as a component of the lens array 5, it is possible to form an image of the document D on the plurality of light receiving surfaces 20a at an erect equal magnification. However, in the present invention, a different type of lens (for example, a combination of a convex lens and a plurality of lenses) may be used. The lens array 5 is inclined in the same direction as the second optical path 14b.

As shown in FIG. 4, each of the sensor IC chips 2 has a rectangular shape in plan view, and incorporates a plurality of light receiving elements 20 each having a rectangular light receiving surface 20a in plan view. In. For example, when reading an A4 width document at a reading density of 8 dots / mm, it is necessary to provide a plurality of light receiving elements 20 in total of 1,728. Therefore, when 96 light receiving elements 20 are built in one sensor IC chip 2, a total of 18 sensor IC chips 2 are mounted on the substrate 4 in a line. .

The plurality of light receiving elements 20 have a photoelectric conversion function of outputting a signal (image signal) of an output level corresponding to the amount of received light when receiving light on each of the light receiving surfaces 20a. Each of the sensor IC chips 2 also incorporates an electronic circuit for serially outputting image signals output from the plurality of light receiving elements 20 in a predetermined order. The plurality of light receiving surfaces 20a are connected to the sensor IC.
The chips 2 are arranged in a row at a constant pitch p in the longitudinal direction (main scanning direction) of the chips 2. This pitch p is the reading pitch of the integrated image reading / writing head A in the main scanning direction.

The width L of each light receiving surface 20a in the sub-scanning direction
Are formed in a size larger than the arrangement pitch p of the plurality of light receiving surfaces 20a. More specifically, the value of the width L has a relationship of L = p · secθ. Where θ
Is the angle of inclination of the lens array 5 with respect to the vertical line C of the light receiving surface 20a, as is well shown in FIG.

The case 1 is made of, for example, a white resin in which titanium oxide is contained in polycarbonate. The surface of each part of the case 1 has a high light reflectance (for example, a light reflectance of about 97% to 98%). ) Surface. For this reason, the inner wall surface of the first optical path 14a is also a surface having a high light reflectance. According to such a configuration, light emitted from the plurality of light sources 3 can be guided to the image reading target area S while being reflected at a high reflectance on the inner wall surface of the first optical path 14a, and the image reading target area S can be guided. The irradiation efficiency of light to S can be increased.

An auxiliary member 6 surrounding the plurality of sensor IC chips 2 is provided below the case 1. This auxiliary member 6 is made of, for example, ABS containing black pigment.
It is made of resin, and the surface of each part is black with high light absorption. According to the configuration in which the auxiliary member 6 is provided,
It is possible to eliminate the possibility that the light that has passed through the lens array 5 and travels toward the plurality of sensor IC chips 2 is scattered and reflected around the plurality of sensor IC chips 2, thereby improving the quality of the read image. Becomes The auxiliary member 6 is attached to the case 1 by fitting projections 60, 60 provided on the upper part thereof into recesses 15, 15 provided in the case 1.

The heat radiating plate 7 is formed in a plate shape having substantially the same shape and size as the substrate 4.
It is adhered to the back surface 4b of the substrate 4 via a double-sided adhesive tape or an adhesive. The radiator plate 7 is made of a metal having a high thermal conductivity, such as aluminum or iron. As shown in FIG. 3, engagement projections 70 are provided at both ends in the longitudinal direction of the heat sink 7. These engagement projections 70, 70 are erected toward the upper side of the heat radiating plate 7, and the tips thereof are substantially L-shaped.
The shape is bent in a letter shape. These engagement projections 70,
70 can be provided integrally with the heat radiating plate 7. Alternatively, for example, a member formed separately from the heat radiating plate 7 may be attached to the heat radiating plate 7. Absent.

Recesses 18 are provided at both ends in the longitudinal direction of the case 1. As shown in FIG. 1, the case 1 is arranged on the surface 4 a of the substrate 4 and the tips of the engaging projections 70 engage with the recesses 18. Thus, positioning and fixing on the substrate 4 are achieved.

FIG. 5 is an explanatory diagram showing an example of a schematic configuration of an image processing apparatus B provided with the integrated image reading / writing head A.

The image processing apparatus B has the integrated image reading / writing head A incorporated in a casing 9 made of, for example, a synthetic resin. The image processing apparatus B has a surface facing the image reading target area S on the surface of the transparent cover 19. the platen roller P ₁ freely rotated for paper feed the document D is provided. Further, at a position facing the plurality of heat-generating elements 8, the recording paper K is the platen roller P ₂ can freely rotated for paper feed is provided. The recording paper K is, for example, a long heat-sensitive paper fed from a winding roll R. Of course, the present invention is not limited to this, and it is also possible to use, for example, single-sheet recording paper.

Next, the operation of the integrated image reading / writing head A and the image processing apparatus B will be described.

First, in the image processing apparatus B, since the integrated image reading / writing head A has both the image reading function and the image forming function, the image reading of the document D and the printing of the image on the recording paper K are individually performed. Or at the same time. As shown in FIG. 2, in the image read / write integrated head A, the lens array 5 and the second optical path 14b formed including the lens array 5 are inclined, and a plurality of The optical path length up to the light receiving surface 20a can be reduced. Therefore, a lens having a large depth of focus can be used as the rod lens 51 of the lens array 5, and an original image can be formed on the light receiving surface 20 a with little blur.

As shown in FIG. 6, in the image read / write integrated head A, since the width L of each light receiving surface 20a of the plurality of light receiving elements 20 in the sub-scanning direction is L = p · sec θ, The light receiving surface 20a can receive the entire amount of the light beam having the width p passing through the inclined lens array 5 without excess or shortage. Therefore, in the image processing apparatus B, when the image reading in the sub-scanning direction is performed at the same pitch as the image reading pitch p in the main scanning direction, light beams unnecessary for the reading are not received by the light receiving surface 20a. The amount of light received on the light receiving surface 20a can be maximized. Therefore, the quality of the read image does not deteriorate due to the shortage of the light receiving amount of the light receiving surface 20a. This is shown in FIG.
When the width of the light receiving surface 20a 'of the light receiving element 20' in the sub-scanning direction is the same as the reading pitch p in the main scanning direction, the light receiving surface 20a 'has a width of p · cos θ. Will be more apparent when compared to only receiving light.

In FIG. 5, both of the _two platen rollers P ₁ and P ₂ are provided with the integrated image reading / writing head A.
May be arranged above the substrate 4. Therefore, the three platen rollers P ₁ and P ₂ and the image reading / writing integrated head A can be prevented from becoming bulky in the height direction of the image processing apparatus B, and the thickness of the image processing apparatus B can be reduced. In the image read-write integral head A, because they are inclined side face 1a of the case 1 facing the platen roller P _2, the platen roller P ₂ above the one side edge portion 4a of the substrate 4 which protrudes from the case 1 A relatively large space for placement can be secured. Therefore, without spilling out very large one side edge portion 4a of the substrate 4 from the case 1, it becomes possible to perform the proper placement of the platen roller P _2, in achieving overall reduction in size, and even more preferably Become. Further, the transparent cover 19 to inclined, it is possible place the platen roller P ₁ which faces the transparent cover 19 from the other platen roller P ₂ to moderately away. Therefore, when the diameters of the _two platen rollers P ₁ and P ₂ are increased, it is possible to prevent the two from unduly interfering with each other.

[0046] The platen roller P _1, P ₂ has a document D
It is necessary to incorporate the recording paper K into the housing 9 such that the recording paper K is pressed against the surface of the transparent cover 19 or the surface of the heating element 8 with an appropriate pressure. However, since these platen rollers P ₁ and P ₂ may be arranged above the image reading and writing integrated head A, the assembling work can be performed from one direction, and the assembling workability is good. Can be something. In addition, since the directions in which the platen rollers P ₁ and P ₂ are pressed against the transparent cover 19 and the heating element 8 are also in the same direction, the structure for that can be made very simple.

On the other hand, the image read / write integrated head A is
As described with reference to FIGS. 2 and 3, the plurality of light sources 3, the plurality of sensor IC chips 2, the plurality of drive ICs 80,
And each of the plurality of heating elements 8 is connected to the surface 4 a of the substrate 4.
And the wiring patterns associated with them are also formed on the surface 4a. Therefore, it is not necessary to turn the substrate 4 upside down at the time of mounting each component and manufacturing the wiring pattern, and the productivity can be improved. Also, the operation of assembling the case 1 to the substrate 4 is performed by placing the case 1 on the substrate 4 and then engaging the engaging projections 70, 70 of the heat sink 7 with the recesses 18, 1 of the case 1.
8, the case 1 and the heat sink 7
May be hooked to each other, which is also easy. The engagement projections 70, 70 can also have a role of aligning the case 1 and the substrate 4, and each part of the case 1 and the sensor IC chip 2 and the light source 3
It is also possible to set the positional relationship with various electronic components to an appropriate state. Further, the engagement protrusion 7
In the structure for assembling the case 1 using the components 0 and 70, the board 4 is sandwiched between the case 1 and the heat sink 7 which are hung on each other. Therefore, the positional relationship between the heat sink 7 and the substrate 4 can be stabilized.

In the integrated image reading / writing head A, heat is generated from the plurality of heating elements 8 and the light sources 3 when the head is driven, and the heat can be appropriately radiated to the outside via the heat radiation plate 7. Therefore, the temperature of the heating element 8 can be stabilized, and the quality of an image printed and output on the recording paper K can be prevented from deteriorating.

In the above embodiment, the width L of the light receiving surface 20a of the light receiving element 20 in the sub-scanning direction is L = p · secθ, but the present invention is not limited to this. In the present invention, the width L of the light-receiving surface in the sub-scanning direction may be at least larger than the array pitch p of the light-receiving surface in the main scanning direction (p <L). It is possible to appropriately prevent the amount of received light from decreasing. However, it is preferable that the width L does not exceed the value of p · secθ, and in practice, it is preferable that the width L be slightly smaller than p · secθ. The arrangement pitch in the main scanning direction of the light receiving surface in the present invention is, as described above,
This corresponds to the reading pitch in the main scanning direction. Therefore,
For example, as shown in FIG. 8, a plurality of light receiving elements 20A provided on the sensor IC chip 2A are configured to correspond to the reading of a color image. A total of three types of light receiving surfaces 20R, 20G, and 20B for reading each color (red, green, and blue)
, The three types of light receiving surfaces 20R, 20R
G, 20B is the arrangement pitch p of each set of light receiving surfaces when one set of light receiving surfaces is used.

In the above embodiment, the light receiving surface 20a
Is determined based on the arrangement pitch p of the light receiving surfaces 20a in the main scanning direction, but the present invention is not limited to this. In the image processing apparatus, when performing an image reading process, it can be switched to, for example, a normal mode (an image reading mode at a normal pitch) or a fine mode (an image reading mode at a fine pitch) according to a user's request. It is desirable to configure,
In this case, the reading pitch in the sub-scanning direction is not constant, and the reading pitch in the sub-scanning direction may differ from the reading pitch in the main scanning direction. Even in such a case, according to the present invention, the light receiving amount on the light receiving surface can be reduced by setting the width L of each light receiving surface of the plurality of light receiving elements in the sub-scanning direction in a relationship of L> p ′ · m. You can do much. Here, p ′ is the minimum image reading pitch in the sub-scanning direction, and m is the image magnification of the lens. As a specific example, when p ′ = 130 μm, the image magnification of the lens is the same, and when m = 1, the width L of the light receiving surface in the sub-scanning direction is set to be larger than 130 μm. .
In the case where the reading pitch in the sub-scanning direction is set to 130 μm using a lens having an image magnification of 1 ×, conventionally, the width of the light receiving surface in the sub-scanning direction is set to 130 μm or less. However, in the present invention, the width of the light receiving surface in the sub-scanning direction is 130 μm.
By setting the value to be larger than m, it is possible to appropriately prevent the light receiving amount of the light traveling on the light receiving surface obliquely from the light receiving surface from decreasing. In order to maximize the amount of light received on the light receiving surface while preventing the light receiving surface from receiving the reflected light that travels from an unnecessary portion of the document surface, L = p ′ · m · s
The relationship may be ecθ. Thus, in the present invention,
The width of the light receiving surface in the sub-scanning direction may be determined from the values of the minimum reading pitch in the sub-scanning direction and the image magnification of the lens.

In addition, the specific configuration of each part of the integrated image reading / writing head and the image processing apparatus according to the present invention can be variously changed in design. In the above embodiment, the light source 3
Is mounted on the same surface of the substrate 4 as the surface on which the plurality of sensor IC chips 2 and the heating elements 8 are mounted. In the present invention, instead of this, for example, the same as the conventional device shown in FIG. Alternatively, the light source may be provided in the case. Also, a configuration without a heat radiating plate may be adopted.

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating an example of an integrated image reading / writing head according to the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is an exploded perspective view of the integrated image reading / writing head shown in FIG. 1;

FIG. 4 is a plan view of a sensor IC chip used in the integrated image reading / writing head shown in FIG. 1;

FIG. 5 is an explanatory diagram illustrating an example of a schematic configuration of an image processing apparatus including the integrated image reading / writing head illustrated in FIG. 1;

FIG. 6 is an explanatory diagram showing the operation of the image reading / writing integrated head shown in FIG. 1;

FIG. 7 is an explanatory diagram showing a comparative example with the image reading / writing integrated head shown in FIG. 1;

FIG. 8 is a main part plan view showing another example of the sensor IC chip.

FIG. 9 is a cross-sectional view showing an example of a conventional image reading / writing integrated head.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Case 2 Sensor IC chip 3 Light source 4 Substrate 4a Surface (of substrate) 5 Lens array 7 Heat sink 8 Heat generating element (printing element) 14a First optical path (optical path) 20 Light receiving element 20a Light receiving surface A Image reading / writing integrated head B The image processing apparatus D document K recording sheet S image reading target area P ₁ document platen roller P ₂ platen roller recording paper

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Toshihiko Takakura 21-Nishiinouzo-Mizozaki-cho, Ukyo-ku, Kyoto-shi Inside ROHM Co., Ltd. Reference) 2C055 EE00 EE02 5C051 AA03 BA04 CA01 DA03 DA10 DB01 DB02 DB04 DB07 DB22 DB29 DC02 DC04 DC05 DC07 EA00

Claims (5)

[Claims] A plurality of light-receiving elements mounted on one surface of a substrate so that the plurality of light-receiving faces are arranged in a row; and a plurality of light-receiving elements surrounding the plurality of light-receiving elements. A case provided on the substrate and forming an optical path for guiding light emitted from a light source to an image reading target area; and a lens capable of converging light reflected from the image reading target area on each of the light receiving surfaces. And a plurality of printing elements mounted in a row on a portion of the one surface of the substrate protruding from the case, and the lens is inclined with respect to each of the light receiving surfaces. And a width of each light receiving surface in the sub-scanning direction is larger than an arrangement pitch of each light receiving surface in the main scanning direction. 2. The width L of each light receiving surface in the sub-scanning direction is L
≤p · secθ (where p is the array pitch of each of the light receiving surfaces in the main scanning direction, and θ is the inclination angle of the lens with respect to a vertical line of each of the light receiving surfaces).
The image reading / writing integrated head according to claim 1. 3. A plurality of light receiving elements having a plurality of light receiving surfaces, the plurality of light receiving elements mounted on one side of a substrate such that the plurality of light receiving surfaces are arranged in a row, A case provided on the substrate and forming an optical path for guiding light emitted from a light source to an image reading target area; and a lens capable of converging light reflected from the image reading target area on each of the light receiving surfaces. And a plurality of printing elements mounted in a row on a portion of the one surface of the substrate protruding from the case, and the lens is inclined with respect to each of the light receiving surfaces. And the width L of each light receiving surface in the sub-scanning direction is L> p ′ · m (where p ′ is the minimum image reading pitch in the sub-scanning direction, and m is the image magnification of the lens) ). , Image reading and writing integrated head. 4. The integrated image reading / writing head according to claim 1, wherein said light source is mounted on said one surface of said substrate. 5. An image processing apparatus comprising the integrated image reading / writing head according to claim 1.