JPH08116404A - Image read element - Google Patents

Abstract

PURPOSE: To prevent the image read element from being warped and to prevent distortion in an output at both ends and in the middle of the image read element. CONSTITUTION: In the image read element having a support base 102 supporting a light receiving element array 101, a spacer 103 provided on the support base 102, and a light transparent plate 104 provided on the spacer 103, the spacer 103 is made of an elastic member. Furthermore, each component is made of a material having the same thermal expansion coefficient or thermal expansion coefficients close to each other. A warp straightening member is provided to a side of the support board 102 opposite to the spacer provision face corresponding to the spacer arrangement position. Or a recessed part is provided to the support base 102 and the light receiving elements are arranged to the bottom of the recessed part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image reading device,
In particular, the present invention relates to an image reading element that is suitably used as an image reading element that reads an original image, which is used in a copying machine or the like.

[0002]

2. Description of the Related Art FIG. 12A shows a conventional image reading device 21.
It is a perspective view which shows the state of 0. 12 (B) and (C)
12A is a view of FIG. 12A viewed from the side and from above, respectively. As shown in FIGS. 12A to 12C, the light-receiving element array 1 is arranged on a ceramic support substrate 2, and a ceramic fence 3 surrounds the ceramic support substrate 2, and a light-transmissive face is placed on the fence. The plate 4 is arranged.
The ceramics 2 and 3 and the ceramics 3 and the face plate 4 are fixed by an adhesive, and the terminals (pins) 5 from the light receiving element array 1 extend from the ceramics 2 and 3.

[0003]

However, in the image reading element having such a structure, the ceramics 2 and 3 and the ceramics 3 and the face plate 4 are fixed by using an adhesive as shown in FIG. The warp shown in (B) occurs. Further, the difference in the coefficient of thermal expansion between the ceramic 3 and the face plate 4 also causes the warp of the image reading element. When the image reading element is warped, the output is distorted at both ends or the central portion of the image reading element.

[0004]

A first image reading element of the present invention comprises a support substrate for supporting a light receiving element array, and an elastic member provided on the support substrate so as to surround the light receiving element array. A spacer and a light transmitting plate provided on the spacer for covering the light receiving element array are provided.

A second image reading element of the present invention is provided with a support substrate for supporting the light receiving element array, a spacer provided on the support substrate so as to surround the light receiving element array, and a spacer provided on the spacer. A light-transmitting plate for covering the light-receiving element array, wherein the support substrate, the spacer, and the light-transmitting plate are made of materials having the same or similar thermal expansion coefficients. .

A third image reading element of the present invention is provided with a support substrate for supporting the light receiving element array, a spacer provided on the support substrate so as to surround the light receiving element array, and a spacer provided on the spacer. A light-transmitting plate for covering the light-receiving element array, and a warp correcting member provided on the surface of the supporting substrate opposite to the spacer-arranging surface so as to correspond to the spacer-arranging position. Is.

A fourth image reading element of the present invention has a concave portion, a support substrate on which a light receiving element is arranged at the bottom of the concave portion, and the light receiving element provided on the supporting substrate on which the concave portion is formed. And a light-transmissive plate for covering the array.

A fifth image reading element of the present invention is provided with a support substrate for supporting the light receiving element array, a spacer provided on the support substrate so as to surround the light receiving element array, and a spacer provided on the spacer. An image reading element comprising a light transmissive plate for covering the light receiving element array, and using a silicone adhesive as an adhesive for fixing these.

[0009]

In the first image reading element of the present invention, the elastic member is used as the spacer provided between the support substrate for supporting the light receiving element array and the light transmissive plate for covering the light receiving element array. It is intended to prevent the warp of the image reading element caused by the difference in the adhesive or the coefficient of thermal expansion.

A second image reading element of the present invention is provided with a support substrate for supporting the light receiving element array, a spacer provided on the support substrate so as to surround the light receiving element array, and a spacer provided on the spacer. , The light-transmitting plate for covering the light-receiving element array and the light-transmitting plate made of materials having the same or similar thermal expansion coefficients to each other prevent warpage of the image reading element caused by a difference in thermal expansion coefficient. To do.

According to the third image reading element of the present invention, a warp correcting member is provided on the surface of the supporting substrate supporting the light receiving element array opposite to the spacer arranging surface in correspondence with the spacer arranging position. , To prevent the image reading element from warping.

A fourth image reading element of the present invention has a concave portion, a support substrate having a light receiving element arranged at the bottom of the concave portion, and the light receiving element provided on the supporting substrate on the concave portion forming side. By providing a light-transmissive plate for covering the array, the spacer and the support substrate are integrated, and the warp of the image reading element caused by the adhesive between the spacer and the support substrate or the difference in the thermal expansion coefficient, etc. Is to prevent.

In the fifth image reading element of the present invention, by using a silicone adhesive as an adhesive for fixing the supporting substrate, the spacer and the light transmitting plate, the image reading element is prevented from being warped by the adhesive. To do.

[0014]

The present invention will be described below based on preferred embodiments.

1A and 1B are views showing a first embodiment of an image reading element of the present invention. FIG. 1A is a perspective view, FIG. 1B is a front view, and FIG. 1C is a plan view. Is.

In FIG. 1, 101 is a light receiving element array,
Reference numeral 102 denotes a ceramic support substrate, 103 denotes a spacer, which is made of an elastic member such as rubber here. 104 is a light-transmissive face plate, and 105 is a terminal (pin).
Alumina is used as the ceramic support substrate 102, and borosilicate glass is used as the light transmissive face plate 104, for example. Ceramic support substrate 102, spacer 103, light transmissive face plate 1
04 is fixed with an adhesive such as epoxy.

In this embodiment, the ceramic fence 3 shown in FIG. 12 is used.
By using an elastic member such as rubber instead of ceramic, it is possible to prevent the warp of the image reading element due to the use of an adhesive or the difference in the coefficient of thermal expansion. However, when an elastic member such as rubber is used, how to take out the terminals (pins) from the light receiving element array to the outside becomes a problem. That is, if the terminal is taken out laterally from between the elastic member and the ceramic as in the configuration of FIG. 12, the terminal (pin) from the light receiving element array may become unstable due to the weak strength of the elastic member. Therefore, in this embodiment, FIG.
As shown in (A) to (C), a hole for a terminal is opened in the ceramic 102 which is the supporting substrate of the light receiving element array 101, and the terminal (pin) 105 is projected from below the ceramic supporting substrate 102. The method of Array) was used. As shown in FIG. 2 (FIG. 2A is a perspective view, FIG. 2B is a front view, and FIG. 2C is a plan view), terminals (pins) 105 are provided from below the ceramic support substrate 102.
But the solder ball 11 is placed on the bottom of the ceramic support substrate 102.
The method of BGA (Ball-Grid-Array) having 6 can also be used.

As a second embodiment of the image reading device of the present invention, the supporting substrate of the light receiving element array, the wall surrounding the light receiving element array, and the light-transmissive face plates covering them all have the same or similar thermal expansion coefficients. Composed of members. For example, the support substrate may be alumina, the fence may be alumina, and the light transmissive face plate may be borosilicate glass. These members have a coefficient of thermal expansion of 6.5 × 10 ^{−6 to} 7.1 × 10 ⁻⁶ /
Since the temperature is C, it is possible to prevent the warp of the image reading element due to the difference in thermal expansion coefficient. It is desirable to use an adhesive having the same or similar thermal expansion coefficient as the above-mentioned thermal expansion coefficient for fixing each member. At this time, the method of taking out the terminals (pins) from the light receiving element array to the outside is the same as in FIG. 12, that is, the method of taking out from between the support substrate of the light receiving element array and the fence surrounding the light receiving element array, and the first embodiment. The method of PGA and BGA similar to the example is mentioned.

3A and 3B are views showing a third embodiment of the image reading device of the present invention. FIG. 3A is a perspective view, FIG. 3B is a sectional view in the B direction, and FIG. Sectional view in C direction, FIG. 3 (D)
Is a plan view. In this embodiment, as shown in FIGS. 3A to 3D, a fence surrounding the light receiving element array 121 above and below the support substrate 122 of the light receiving element array 121 (the surface on which the light receiving elements are arranged and the opposite surface). 123 are arranged to be symmetrical about the support substrate 122. By arranging the fences at vertically symmetrical positions, it is possible to prevent the warpage as shown in FIG. The upper side of the wall 123 functions as a spacer and the lower side functions as a warp correction member. It is also possible to configure the fence acting as a spacer and the fence acting as a warp correction member by separate members having a small difference in thermal expansion coefficient. Also in this embodiment, the method of exposing the terminals (pins) from the light receiving element array 121 to the outside is as shown in FIG.
As in the case of 2, the method of taking out from between the support substrate of the light receiving element array and the wall surrounding the light receiving element array and the method of PGA and BGA similar to the first embodiment can be mentioned.

FIG. 4 is a diagram showing a fourth embodiment of the image reading device of the present invention. FIG. 4 (A) is a perspective view, FIG. 4 (B) is a front view, and FIG. 4 (C) is a plan view. Is. In this embodiment, in order to prevent warpage due to the adhesive as much as possible, FIG.
As shown in (C), a support substrate 132 in which a fence surrounding the light receiving element array 131 is integrally formed (a recess is provided in the support substrate, and the light receiving element array 131 is provided on the bottom surface of the recess).
To place. By providing the concave portion, the light receiving element array 131
The fence that surrounds is made integrally. ), And a light-transmissive face plate 134 is disposed thereon.
Also in this embodiment, the method of taking out the terminals (pins) from the light receiving element array 131 to the outside is the same as that of the above-described first embodiment.

As a fifth embodiment of the image reading element of the present invention, an adhesive for fixing the supporting substrate of the light receiving element array 1, the wall surrounding the light receiving element array 1, and the light transmissive face plate covering them. A silicone adhesive that retains elasticity even when cured is used. That is, it is possible to prevent the warp of the image reading element due to the difference in thermal expansion coefficient and the contraction of the adhesive. At this time, the method of taking out the terminals (pins) from the light receiving element array 1 to the outside is the same as in the first embodiment, that is, the method of taking out from the space between the support substrate of the light receiving element array 1 and the fence surrounding the light receiving element array 1. , PGA, and BGA. It is also possible to use a silicone-based adhesive as the adhesive used in the first to fourth embodiments.

Next, an application example using the image reading element of each of the above embodiments will be described. Although a copying machine is shown in the following application example, it is needless to say that it is not limited to this and can be applied to various other apparatuses using an image reading element.

FIG. 5 shows an external view of an example of a copying apparatus using the present invention. In FIG. 5, an image scanner unit 201 is a unit that reads a document and performs digital signal processing. A printer unit 200 is a unit that prints out an image corresponding to the original image read by the image scanner unit 201 on paper in full color.

In the image scanner unit 201, 20
Reference numeral 2 denotes an original pressure plate, which is an original 20 on the original platen glass 203.
4 is illuminated with the light of the halogen lamp 205. Manuscript 2
The reflected light from 04 is guided to mirrors 206 and 207, and an image is formed on a three-line sensor (here, a CCD is used. It is also referred to as CCD hereinafter) 210 by a lens 208.
The lens 208 is provided with a far infrared cut filter 231.

The CCD 210 color-separates the light information from the original document to obtain full-color information red (R), green (G),
The blue (B) component is read and sent to the signal processing unit 209. Note that the halogen lamp 205 and the mirror 206 are at a speed v, and the mirror 207 is at a speed of 1/2 v, and mechanically in a direction (hereinafter, sub-scanning direction) perpendicular to the electrical scanning direction (hereinafter, main scanning direction) of the line sensor. The entire surface of the document is scanned by moving to.

Reference numeral 211 is a standard white plate, and the sensor 210
The correction data of the read data of the R, G, B sensors of -1 to 210-3 is generated. As shown in FIG. 6, this standard white plate exhibits almost uniform reflection characteristics from visible light to infrared light, and has a white color in the visible. The output data of the visible sensors of the sensors 210-1 to 210-3 are corrected using this standard white plate.

The signal processing unit 209 reads the read R,
The G and B signals are electrically processed, decomposed into magenta (M), cyan (C), yellow (Y), and black (BK) components and sent to the printer unit 200. In addition, one component of the M, C, Y, and BK is determined by the printer 20 for one document scanning (scan) in the image scanner unit 201.
0 is sent, and one printout is completed by scanning the originals four times in total.

The image signals of M, C, Y and BK sent from the image scanner unit 201 are laser driver 21.
Sent to 2. The laser driver 212 is M, C, Y, B
The semiconductor laser 213 is modulated and driven according to the K image signal. The laser light is the polygon mirror 214 and the f-θ lens 2
15, the photosensitive drum 217 is scanned via the mirror 216. Reference numerals 219 to 222 denote developing devices, which are a magenta developing device 219, a cyan developing device 220, a yellow developing device 221, and
The black developing device 222 includes four developing devices alternately contacting the photosensitive drums, and develops the electrostatic latent images of M, C, Y, and BK formed on the photosensitive drums 217 with the corresponding toners. A transfer drum 223 winds the paper fed from the paper cassette 224 or 225 around the transfer drum 223, and transfers the toner image developed on the photosensitive drum 217 to the paper. In this way, M, C, Y, BK 4
After the colors are sequentially transferred, the paper passes through the fixing unit 226 and is ejected.

Next, the image scanner 201 will be described in detail.

Halogen lamp 205 which is a document illumination light source
Is used for reading visible information and has the illumination wavelength component necessary for reading the above information.

FIG. 7A shows the CCD 21 used in this embodiment.
The structure of 0 is shown. Here, 210-1, 210-2, 21
Reference numeral 0-3 is a light receiving element array for reading the R, G, and B wavelength components in order.

As shown in FIG. 7B, 210-1 and 210-2
Each of the R, G, and B sensors up to 10-3 has an opening of 10 μm in the main scanning direction and the sub scanning direction. The three light-receiving element arrays having different optical characteristics are monolithically formed on the same silicon chip so that the R, G and B sensors are arranged in parallel with each other to read the same line of the original. There is.

FIG. 7C is a sectional view taken along the dotted line in FIG. 7A.
Shown in Photosensors 210-1, 210- that read the visible information of each of R, G, B on the silicon substrate 210-4.
2, 210-3 are arranged. R photo sensor 2
An R filter 210-6, which transmits a red wavelength component of visible light, is arranged on 10-1. Similarly, on the G photo sensor 210-2, the G filter 210-7 is
B filter 210-8 on the photo sensor 210-3 of
Is arranged.

Referring to FIG. 8, R, G, B of CCD 210
The spectral characteristics of the line sensor filter will be described. The characteristic indicated by R is the output characteristic of the sensor by the R filter 210-7 and is sensitive to light in the red wavelength range and the infrared wavelength range. The characteristic indicated by G is the output characteristic of the sensor by the G filter 210-8, and is sensitive to light in the green wavelength range and the infrared wavelength range. The characteristic indicated by B is the B filter 2
The output characteristics of the sensor according to 10-9 are sensitive to light in the blue wavelength range and the infrared wavelength range.

As can be seen from this figure, the R, G and B filters 210-6 to 210-8 are sensitive to infrared light of 700 nm or more. Therefore, a filter 210-9 that cuts infrared light is provided corresponding to the R, G, and B photosensors. This infrared cut filter 2
10-9 is composed of a laminated vapor deposition film of SiO ₂ and TiO ₂ and has the characteristics shown in FIG. Reference numeral 210-5 is a flattening layer composed of a transparent organic film.

FIG. 7B shows an enlarged view of the light receiving element.
Each R, G, B sensor has 10 pixels per pixel in the main scanning direction.
It has a length of μm. Each of the R, G, and B sensors has 5000 pixels in the main scanning direction so that the short-side direction (297 mm) of the A3 document can be read at a resolution of 400 dpi.

The line distance between the R, G, and B sensors is 80 μm, and the R, G, and B lines are separated by 8 lines for a sub-scanning resolution of 400 lpi.

Next, the flow of the image signal will be described.

FIG. 10 is a block diagram showing the flow of image signals in the image scanner unit 201. CCD 210
The image signals R ₁ , G ₁ , and B ₁ output from the A / D converters 3002 to 3004 are input to the analog signal processing unit 3001 and subjected to gain adjustment and offset adjustment.
Is converted into an 8-bit digital image signal for each of the R ₂ , G ₂ , and B ₂ color signals. After that, the shading correction unit 3
The signals are input to 005 to 3007, and a known shading correction using the read signal of the standard white plate 211 is performed for each of the R ₃ , G ₃ , and B ₃ color signals.

Reference numeral 3015 denotes a clock generator which generates a clock for each pixel. The main scanning address counter 3016 is an up counter, counts clocks, and
Generate the pixel address output for the line. Reference numeral 3017 denotes a decoder, which decodes the main scanning address from the main scanning address counter 3016 and represents a valid area in a CCD drive signal for each line such as a shift pulse or a reset pulse or a 1-line read signal from the CCD. Signal and line sync signal HSYNC. The main scanning address counter 3016 is cleared by the HSYNC signal,
The counting of the main scanning address of the next line is started.

As shown in FIG. 7B, since the light receiving portions 210-1, 210-2, 210-3 of the CCD 210 are arranged with a predetermined distance, each of the R, G, B sensors is an original document. You will read different line positions of the original on the table.
The line delay elements 3008 and 3009 correct spatial deviations in the sub-scanning direction. To compensate for this,
Specifically, the original document information is read in the sub-scanning direction with respect to the B ₄ signal, and the R ₄ and G ₄ signals are line-delayed in the sub-scanning direction by 16 lines and 8 lines, respectively, and matched with the B ₄ signal.

Reference numerals 3010, 3011 and 3012 denote light quantity / density converters, which are constituted by a look-up table ROM and convert the brightness signals of R ₅ , G ₅ and B ₄ into density signals of C ₁ , M ₁ and Y _1. It Reference numeral 3013 is a well-known masking and UCR circuit, and although detailed description is omitted, Y ₂ , M ₂ , C ₂ , BK ₂ for output by the input three primary color signals C ₁ , M ₁ , and Y _1. Signal is sequentially output with a predetermined bit length, for example, 8 bits, for each reading operation.

A CPU unit 3014 controls the motor driver 3018 for driving the motor 129 of the original reading optical system and turns on and off the original illumination lamp 205.
Sequence control such as the control of the lamp driver 3019 for controlling the pixel section signal VSYNC in the sub-scanning direction.

FIG. 11 shows the timing of each control signal.
The VSYNC signal is an image effective section signal in the sub-scanning direction, and in the section "1", document detection and image reading (scan) are sequentially performed (C), (M), (Y),
The output signal of (BK) is formed. VE is an image effective section signal in the main scanning direction, which takes the timing of the main scanning start position in the section of "1". The CLOCK signal is a pixel synchronization signal and transfers image data at the rising timing of “0” → “1”.

[0045]

As described above, according to the present invention,
It is possible to prevent the warp of the image reading element caused by the difference in the adhesive or the coefficient of thermal expansion, and it is possible to prevent the distortion of the output at both ends and the central portion caused by the warp of the image reading element.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a first embodiment of an image reading element of the present invention, in which an elastic member is used as a spacer.

FIG. 2 is a diagram showing another configuration of the first embodiment of the image reading element of the present invention, in which BGA is used as the terminal lead-out method.

FIG. 3 is a diagram showing the configuration of a third embodiment of the image reading element of the present invention, in which a vertically symmetrical spacer and a warp correction member are provided with respect to the support substrate.

FIG. 4 is a diagram showing the configuration of a fourth embodiment of the image reading device of the present invention, in which the support substrate and the spacer are integrated.

FIG. 5 is a diagram showing a configuration of a color copying machine.

FIG. 6 is a characteristic diagram showing a spectral reflectance of a white plate.

FIG. 7 is a diagram showing a structure of a 3-line color sensor.

FIG. 8 is a spectral sensitivity characteristic diagram of a visible line sensor.

FIG. 9 is a characteristic diagram of an infrared cut filter.

FIG. 10 is a diagram showing a configuration of an image signal control unit.

FIG. 11 is a timing diagram of an image signal.

FIG. 12 is a diagram showing a structure of a conventional image reading element.

FIG. 13 is a diagram showing a warp of an image reading element.

[Explanation of reference numerals] 101, 121, 131 Light receiving element array 102, 122, 132 Ceramic support substrate 105, 115 Terminal (pin) 116 Solder ball 103, 123 Fence 104, 124, 134 Light transmissive face plate

Claims (5)

[Claims] 1. A support substrate for supporting a light-receiving element array,
An image including a spacer made of an elastic member provided on the support substrate so as to surround the light receiving element array, and a light transmissive plate provided on the spacer for covering the light receiving element array. Reading element. 2. A support substrate for supporting the light-receiving element array,
A spacer provided on the support substrate so as to surround the light receiving element array; and a light transmitting plate provided on the spacer for covering the light receiving element array, the support substrate and the spacer An image reading element in which the light-transmissive plate and the light-transmissive plate are made of materials having the same or similar thermal expansion coefficients. 3. A support substrate for supporting the light-receiving element array,
A spacer provided on the support substrate so as to surround the light receiving element array, a light transmitting plate provided on the spacer for covering the light receiving element array, and a spacer disposition surface of the support substrate. An image reading element including a warp correction member provided on the surface opposite to the side corresponding to the spacer disposition position. 4. A support substrate having a recess, and a light receiving element arranged at the bottom of the recess, and a light-transmissive material provided on the support substrate on the side where the recess is formed, for covering the light receiving element array. An image reading element including a plate. 5. A support substrate for supporting the light receiving element array,
A spacer provided on the support substrate so as to surround the light-receiving element array, and a light-transmissive plate for covering the light-receiving element array provided on the spacer are provided for fixing these. An image reading element using a silicone adhesive as an adhesive.