JPS62296651A - Image reading sensor - Google Patents

Abstract

PURPOSE:To eliminate a need for any special method particular to the fixation of a translucent substrate by providing plural protruding parts to fix the position of the said substrate to an attachement plate on which the said substrate, an electrical connecting means, and a circuit board are mounted. CONSTITUTION:The positional relation between the printed electrodes 31i and 31j of the printed circuit board 31 is determined by a stopper screw 31a and oblong holes in fixing planes 30i and 30j of the attachment plate 30 that bits only in the direction perpendicular to the line between the set screw 31a and a set screw 31b. The glass substrate 14a is pressed against bent cut parts 30c and 30d provided to the attachement board 30 at its one end side, and regulated in rotation and positioned in one direction, further positioned in the thrusting direction by being pressed against a bent cut part 30e at its glass end surface perpendicular to the above-mentioned end side, and the substrate 14a is thus fixed. By thus positioning the glass substrate by means of the bent cuts that needs only comparatively low cost and short pressing time, any special method is not necessary for the fixation, and the production cost is remarkablly reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an image reading sensor, and more particularly to fixing a glass substrate of a contact type image reading sensor having a light receiving element formed on its surface.

[Prior Art] Conventionally, in this type of image reading sensor, the sensor is formed at the same size as the original, so the length of the sensor needs to be equal to or longer than the reading width of the original. Therefore, in order to reduce the overall manufacturing cost of the reading sensor and improve its optical performance, the sensor is generally mounted on the back side of a structure such as a plate or body, and the input light is transmitted through the structure. The sensors are powered by humans. For this reason, the sensor base (
A thin flat plate such as glass is often used as the substrate.

Furthermore, the connectors for connecting human output signals to the above-mentioned sensors are often pattern-formed on a glass flat plate by thin film deposition or the like. The size of this pattern is usually about width i n+m
, the pitch is often about 2 mm.

As mentioned above, in order to transmit the output signal from the sensor provided on a transparent material such as glass to a separate drive circuit,
Since it is difficult to solder a connector to a glass substrate like a regular printed circuit board or to solder wires directly, it is generally a printed circuit board that is separate from the liquid crystal panel, such as in electronic desktop calculators. The interconnector used to connect the sensor and drive circuit is a rectangular parallelepiped or cylindrical connecting member in which a conductive part with a wire diameter or line width that is sufficiently smaller than the line width or pitch width of the pattern electrode is wrapped in an elastic material. It is often placed between the printed board.

At this time, it is common to form a pattern with the same width and the same pitch on the pattern electrode of the sensor on the side of the printed circuit board facing the sensor, and to use the sensor and the printed circuit board by sandwiching the sensor and the printed circuit board.

(Problem to be Solved by the Invention) However, when electrical connection is made using the interconnector as described above, the positions of the respective patterns of the image reading sensor and the printed circuit board must be completely overlapped when projected. If this is not the case, problems may occur such as the human output line shorting out or not being electrically connected.

For this reason, in the past, it was necessary to align the patterns of the sensor and the printed circuit board, which required a large amount of man-hours to assemble the device, which led to high manufacturing costs. Furthermore, it is necessary to securely fix the sensor and the printed circuit board. For this purpose, the sensor is first pressed against the unit structure (mounting plate) of the image reading sensor using a leaf spring, etc., and the interface is then fixed. connector.

Since the printed circuit board was fixed, it also took a lot of man-hours.

In addition, since the signal level from the image reading sensor is generally very small, it is necessary to increase the contact area per pattern at the above-mentioned joint, and the length of each pattern must be increased. Generally, it is about 4 to 5 mm. In this case, if the above-mentioned interconnector is attached at an angle with respect to the above-mentioned pattern, there is also a drawback that short-circuiting occurs with the adjacent pattern. As described above, the conventional fixing method has a problem in that the positional relationship between the printed circuit board of the sensor drive circuit and the sensor portion must first be made accurate.

Furthermore, even if a method of directly positioning the glass substrate of the sensor is adopted instead of the conventional method described above, processing the glass substrate into a shape suitable for positioning conventionally requires a significant increase in manufacturing costs. Therefore, the end surface of the glass substrate is surrounded by aluminum or the like, and the aluminum or the like is milled and processed, and the end of the printed circuit board is positioned by butting against the processed surface. However, with this configuration, the expensive aluminum substrate must be subjected to secondary annealing, and since this processed plane is the surface in direct contact with the glass, in order to maintain the flatness of the glass substrate,
This still requires a highly flat processed surface, which has the disadvantage of increasing manufacturing costs.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an image reading sensor that eliminates the above-mentioned drawbacks, has a simple structure that is easy to process, and has a low manufacturing cost.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a photoelectric conversion device for converting optical information into an electrical signal on a mounting plate disposed on the incident side of optical information incident from the reading optical system. An image reading sensor in which a translucent substrate having an element, an electrical coupling means, and a circuit board having an electric circuit for transmitting and receiving signals to and from the photoelectric conversion element via the electrical coupling means are sequentially stacked and fixed on a mounting plate. The mounting plate is characterized in that a plurality of protrusions are formed on the mounting plate to abut against the outer edge of the translucent substrate and fix the position.

[Function] The present invention uses a very simple structure in which three or more abutments are provided on the mounting plate, so there is no need for the conventional molding process for fixing to the glass substrate or the separate attachment to the glass substrate. Performance equivalent to that obtained by bonding members or performing expensive processing such as milling on the mounting plate can be obtained, and as a result, manufacturing cost and labor can be reduced.

[Example] Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a cross-sectional configuration of an embodiment of the present invention. The image reading device shown in this figure is used in facsimile machines, etc.
This is a type in which the original is conveyed in a U-turn from the bottom to the top, and a same-size image sensor module is used as a light receiving element. Here, 1 is a document to be read, and image information to be read is written on the arrow A side of the figure. Reference numeral 2 denotes a conveyance roller that conveys the original 1 in the direction of arrow B in this figure, and reads image information on the original 1 while rotating in the direction of arrow C in this figure by a drive source such as a motor (not shown). be. 3 is a structural frame of the device. 3a and 3b are fixed to the structural frame 3 and the original 1
This is a pair of paper feed guides that guide the paper to the roller 2, with 3a being an upper guide and 3b being a lower guide. Reference numeral 4 designates a paper discharge guide that guides the document 1 out of the apparatus, and 5 designates an upper cover of the apparatus. Reference numeral 5a denotes a cover that also serves as a guide for the discharge section, and is rotatably supported by the upper cover 5 in the direction of arrow R in the figure, so that it can be repaired in the event of a jam. 6 is the bottom 5 cover of the device. Reference numeral 7 denotes a suppression guide for the original 1, which is pressed by a pressing spring serving as a suppression means to be described later and holds the original 1 between the rollers 2 and the original 1.
gives conveying force to.

Reference numeral 8 denotes a structure of a reading unit to which an LED array as illumination means, an equal-magnification lens, a sensor module, etc., which will be described later, are fixed to the main body. This structure 8 is made of a material such as drawn aluminum, die-cast aluminum, or resin. 9 is a hole for the rotation center formed in the reading unit structure (hereinafter referred to as holder), and the boulder 8 is a hole for the rotation center 9 formed in the reading unit structure (hereinafter referred to as holder).
It is pivotably supported from both sides. 10 is an LED (light emitting diode) array as illumination means for illuminating the original 1, 11 is an original reading position, and 12 is a light receiving line which is a light receiving position on a light receiving element. Reference numeral 13 denotes a 1-magnification lens for imaging to guide the reflected light from the original reading position 11 to the light receiving line 12. Reference numeral 14 denotes an image sensor module (as a light-receiving element) having a photoelectric light-receiving section in the light-receiving line 12.
(hereinafter referred to as an image sensor).

20 is an actuator that rotates in conjunction with the movement of the document 1 when it is inserted into the device; 21 is the actuator 2;
A detector 30 detects rotation of the image sensor 14, and a mounting plate 30 fixes the image sensor 14.

31 is a printed circuit board having a drive circuit for driving the image sensor 14; this drive circuit is connected to a system controller (not shown); the light receiving element 14 is driven by a human power signal from the system controller;
The output signal is processed and transmitted to the system controller. 32 is a pressing spring as a suppressing means for pressing the above-mentioned holder 8 toward the roller 2 side, and 34 is an image sensor 14.
A zebra connector 135 that electrically connects the drive printed circuit board 31 and the drive printed circuit board 31 is a shield cover. .

In the above configuration, when the conveyance roller 2 rotates counterclockwise in the direction of arrow C in response to the insertion of the document 1, the rotation of the roller 2 conveys the document 1 upward from the direction of arrow B to the direction of arrow B'. be done. Image information on the fourth side (back side) of the original 1 is irradiated with light emitted from the LED chips of the LED array 10 condensed by a rod-shaped equal-magnification lens 13, and the reflected light passes through the equal-magnification lens 13. The light is incident on the light receiving section of the image sensor 14, photoelectrically converted by the image sensor 14, and image information in the form of an electrical signal is output. FIG. 2 shows the structure of the document reading unit shown in FIG. 1 in more detail. Here, the original fi 1 is inserted from the direction of arrow B, makes a U-turn in the direction of B', and is discharged. below,
Components not explained in FIG. 1 will be explained.

First, 2a is a pulley on one side of the conveyance roller 2, and 2b is a belt that transmits driving force from a drive system (not shown) to the pulley 2a. 7a and 7b are for pushing the pressure guide 7 into the boulder.
Set screws 88 to 8c are fixing screws for fixing the lens 13 to the boulder 8 from a direction perpendicular to the optical axis of the 1-magnification lens (for example, Selfoc lens array) 13, which is an imaging lens. It's a screw.

Holes 8d and 8e are formed in the holder 8, and the side surface of the lens 13 can be accessed through the holes 8d and Ile from both directions in FIG.

Therefore, the holes 8d and 8c can be used to adjust the position of the lens 13 in the optical axis direction using a needle-like protrusion or the like (not shown).

8f and 8f' are installed on the side of boulder 8! 8f is a long hole and 8f' is a circular hole. 8g and 8h are taps provided at both ends of the holder 8, and are connected to the light receiving element mounting plate 30 explained in FIG.
It is for fixing.

Reference numerals 9a and 9b are stepped bolts, which are passed through taps CJ provided on the frame 3 from both sides of the device and fitted into the elongated hole 8f and the circular hole 8f' of the holder 8 with the pin portions at their tips. The holder 8 is pivoted around the bins 9a and 9b so as to be rotatable in the direction of arrow M in the figure.

10a to 10e are components of an LED array 10 which is illumination means. 10a is a small rectangular light-emitting LED chip attached to the LED board 10b J-, and 10e is a rod-shaped lens for condensing the luminous flux of this chip 10a and illuminating the document 1 at the document reading position 11. , 10d is LE
The rod-shaped lenses 10e are located at both ends of the D chip 10a.
This is a lens house for fixing to the ED board 10b.

10c is an external resistor provided to limit and adjust the current value of the LED chip 10a, and the LED board 10b1
It is soldered to.

30a and 30b attach the light receiving element mounting plate 30 to the holder 8.
This is a hole through which a pair of stoppers 33 are passed for fixing the
It is preformed to be larger than the screw diameter of the set screw 33 so that it can be fixed in position with respect to the mounting plate 30 and the holder 8. 30c, 30d and 30e are cut and raised portions for positioning the glass end face of the image sensor 14, 30i and 30;
j is a fixing surface for fixing the printed circuit board 31, and is provided with a tap. 30' to 30n are hooking claws for preventing the printed circuit board 31 from floating up, and 30o and 30p are hooking claws for hooking the pressing spring 32 as a pressing means. Numerals 31a and 31b are set screws for fixing the printed circuit board 31 to the mounting plate 30.

FIG. 3 shows the structure of a fixing member that fixes the glass substrate of the image sensor module 14 described above. In this figure,
14a is a glass substrate on which a photoelectric light receiving element (photoelectric conversion element) and the like are formed on the surface of the image sensor module 14;
14d and 14e are electric signals generated by the photoelectric receiving element 14b; This is a printed electrode (connector electrode) that brings out the electrode to the outside.

31i and 31j are used for processing signals output from the image sensor module 14 and for processing signals output from the image sensor module 1.
Electrical contact is made with the image sensor module 14 through a printed electrode (connector electrode) and 34b formed on the printed circuit board 31, which generates an electric signal (drive control signal) to be manually applied to 4. 31c and 31d are image reading units. 115' with respect to the mounting plate 30 that constitutes the
This is a screw fitting hole (screw hole) for determining and fixing.

Reference numerals 31e and 31f are hook portions that fit into the hook portions 30 of the mounting plate 30 at 30° C., thereby fixing the glass substrate a.

When assembling, first set the image sensor module inside the mounting plate 30, attach the zebra connectors 34a and 34b to the printed electrodes 14d and 14e on the glass substrate 14a, and then attach the printed circuit board 31 to the image sensor module 14. Place the hook part 301.3 on top.
Hook the hooks 31e and 31f onto the hooks 31e and 31f, and then fit the set screws 31b and 31 into the screw holes 31C and 31d.
d into the tapped holes 31c and 31d and tighten, the image sensor module 14 is tightly fixed between the mounting plate 30 and the printed circuit board 31. At this time, the cut and raised portion 30C130d of the take-out plate 30 is connected to the glass substrate 1 of the image sensor module 14 as described above.
It acts to position the glass end face of 4a against it. Thereafter, the mounting plate 30 is fixed to the holder 8 with screws through the screw holes 30a, 30b of the plate 80.

In the above configuration, a current corresponding to the strength of the incident light is passed through the photoelectric light receiving element 14b, and the strength of the current is converted into voltage strength by the circuit on the printed circuit board 31. The electrical connection between the element 14b and the printed circuit board 31 is through printed electrodes 14a printed on the glass substrate 14a.

14e, printed electrodes 31i, :llj on the printed circuit board 31 disposed at positions corresponding to the electrodes, and sandwiched between the printed circuit board 31 and the glass substrate 14a. This is done between the zebra connectors 34a and 34b having thin bits.

Printed electrode g 14 d, 14 on glass substrate 14a
e and printed electrode 3 of printed circuit board 31]i, 31. j
Regarding the positional relationship between the two electrodes, it is an important factor that both electrodes are on the same plane and that the positions of both electrodes are correctly connected in the direction in which they are connected. In the wooden embodiment shown in FIG.
, 31b and the counterbore holes 31c, , 11. The positional relationship is determined by d and the elongated holes in the fixing surfaces 30i and 30j of the mounting plate 30 that fit only in the direction perpendicular to the line connecting the set screws 31a and 31b. The glass substrate 14a has two cut-and-raised portions 3 provided on a mounting plate 30 integrally formed with sheet metal.
0c, 30d to restrict rotation and position in one direction, and the glass end face perpendicular to the end face to the cut and raised portion 30e of the sheet metal as described above to position the thrust direction. ), the elastic force of the crushed zebra connectors 34 a, , ' 34 b, or other elastic methods are sandwiched between the printed circuit board 131 and the mounting plate 30 to fix them.

In this way, it is possible to position items that are difficult to process, such as glass substrates, with complex shapes by cutting and raising parts using sheet metal or plastic processing, which is relatively inexpensive and takes a long time to apply pressure. Therefore, no special method is required for fixing, and manufacturing costs can be significantly reduced.

FIG. 5 shows another embodiment of the invention. In this example, an unbent portion (unbent portion) 30x is provided in place of the above-mentioned cut-and-raised portions 30c, 30d, and 30e, and the glass substrate 14 is provided on the inner surface of this portion 30x in the same manner as described above.
The image sensor module 14 is pressed against the end face of a.
position.

In addition, in the above-mentioned embodiment, there are three abutments 30c.

30d and 30e were used, but if an abutment was also provided at the position facing the object and surrounded by six bosses, etc., it would be necessary to press the abutment while fixing. In contrast to the embodiment described above, the glass substrate 14 can be folded down (= placed on the I plate 30), which can cause very slight play that cannot be avoided in terms of processing accuracy, making assembly easier. You can improve. □.

[Effects of the Invention] As explained above, the present invention uses a very simple structure in which three or more abutments are provided on the mounting plate.
The +11. As a result, manufacturing costs can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing the configuration of an embodiment of the present invention, FIG. 2 is a perspective view showing details of the configuration of the document reading unit shown in FIG. 1, and FIG. 3 is an image sensor module 14 shown in FIG. 2. FIG. 4 is an enlarged perspective view of the cut-and-raised portion of FIG. 3; FIG. 5 is an enlarged perspective view of main parts of another embodiment of the present invention. It is. DESCRIPTION OF SYMBOLS 1... Document, 2... Conveyance roller, 8... Reading unit structure (holder), 13... Equal magnification lens (SELFOC lens array), 14... Image sensor module, 14a...・Glass substrate, 14b...Photoelectric light receiving element, 14c...Hold, 14d, 14e...Printed electrode (connector electrode)
, 30...Mounting plate, 30a, 30b = hole, 30c, 30d, 30e-cut and raised portion, 30
i, 30j...Fixed surface, 30x...Bending portion, 31...Printed circuit board, 31e, 31f - hook portion, 31i, 31j...Printed circuit board, 34a, 34b...Zebra connector.

Claims (1)

[Scope of Claims] 1) A light-transmitting substrate having a photoelectric conversion element that converts the optical information into an electrical signal is electrically coupled to a mounting plate disposed on the incident side of optical information incident from the reading optical system. and a circuit board having an electric circuit for transmitting and receiving signals with the photoelectric conversion element via the electrical coupling means are sequentially stacked and fixed on the mounting plate, the image reading sensor comprising: An image reading sensor characterized in that the mounting plate is provided with a plurality of protrusions that abut against the outer edge and fix the position. 2) The image reading sensor according to claim 1, wherein the protrusion is a cut edge or an unbent edge formed by sheet metal or press working. 3) In the sensor according to claim 1 or 2, the electrical coupling means is made of an elastic member, and the elasticity of the electrical coupling means or another elastic member is used to transfer the optical information in the optical axis direction. An image reading sensor characterized by fixing.