JPS62296652A - Image reader - Google Patents

Abstract

PURPOSE:To prevent stray lights from propagating through a glass and reaching a light receiving element with a simple constitution by covering the glass substrate plane of the light receiving element with a non-translucent material or object. CONSTITUTION:The stop surface and the end surface of the translucent substrate glass 14d of the image sensor are covered with a low-hardness mold 14b and mold frame 14a to shield the parts other than the the part on which a photo information is made incident. In case light beams other than the photo information is projected to this unit part, the lights would reach the light receiving part if the frame 14a was translucent or a frame end part did not exist, and therefore correct information would not be transmitted. In this constitution, the end part 14c is provided to the frame 14a in order to prevent the stray lights from entering to the glass end surface of the substrate 14d, being made providing the end surface of the substrate 14d. In such a way, the light input other than through a normal path is shelded by the non-translucent substance approximately completely. As a result, an exact image reading can be easily executed and with a small cost.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an image reading device, and particularly to an image sensor module that converts the intensity of diffused light from a document into an electrical signal using an image sensor module having a transparent substrate such as glass. The present invention relates to an image reading device.

[Prior Art] Conventionally, in many image sensor modules of this type, a non-light-transmitting ceramic or the like is generally used as a deposition substrate. In this case, there is a high degree of freedom in shape, and the non-transparent property allows for relatively easy shielding of light. However, in the case of a huge image sensor module that has the same size as the width of a document, a translucent substrate, such as glass, is often used for cost and technical reasons. Using a substrate also has the advantage that optical information from the substrate side can be read at low cost.

[Problems to be Solved by the Invention] However, in the conventional image sensor using glass as a substrate, if there is stray light around the module, the light may enter from the edge of the glass surface (stray light) or be transmitted through the glass. Since the light reaches the light receiving element and converts the optical information into electrical information in the wrong form, a large-scale light-shielding structure must be installed separately to prevent the light from reaching the image sensor module board itself. There was a drawback that it was necessary.

The present invention eliminates the above-mentioned drawbacks and eliminates the confusion due to its simple construction.
By preventing light from propagating through the glass and reaching the light receiving element, it is possible to accurately read image information, and there is no need for large-scale light-shielding structures, which is advantageous in terms of ffli value and space. An object of the present invention is to provide an image reading device equipped with an image sensor module.

[Means for Solving the Problems] In order to achieve the present object, the present invention is provided on a transparent substrate.
In addition, in an image reading device that uses a photoelectric conversion element to convert optical information incident from an optical system into an electrical signal, almost the entire surface of a transparent substrate other than the part where optical information is incident is covered with a non-transparent substance or object. It has different characteristics.

[Function] In the present invention, since the surface of the glass substrate of the light-receiving element is completely surrounded by 111% optical material or object, stray light can be easily prevented and accurate image information can be read. This eliminates the need for large-scale light-shielding structures, which is advantageous in terms of manufacturing cost and space design.

[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.
The document is transported from the bottom to the top (in a no-turn pattern, and
This is a type of image sensor using 1,000 joules as a light receiving element. Here, reference numeral 1 indicates a document to be read, and image information to be read is written on the arrow A side of the figure. 2 is a conveyance roller that conveys the original 1 in the direction of arrow B in this figure, and reads the image information on the original 1 while being rotated in the direction of arrow B in this figure by a drive source such as a motor (not shown). be. 3 is a structural frame of the device. 3a and :lb are paper feed guide pairs fixed to the structural frame 3 to guide the original 1 to the rollers 2;
is an upper guide, and 3b is a lower guide. Reference numeral 4 designates a "discharge guide" that guides the document 1 out of the apparatus, and 5 designates an upper cover of the apparatus. 5a designates a cover that also serves as a guide for the output section, and is supported by the upper cover 5 in the direction of arrow R in the figure. It is rotatable and has a configuration that allows for repair and post-processing in the event of a jam. 6 is the bottom cover of the device. 7 is a pressing guide for the document 1, which is pressed by a push spring as a pressing means to be described later. By holding the original 11% 1 between the roller 2 and the roller 2, conveying force is applied to the original 1.

Reference numeral 8 denotes a reading unit structure in which an LED array as illumination means, an equalization 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) 8, and the holder 8 is connected to the main body and this rotation center 9.
It is pivotably supported from both sides. 1° is 1° as an illumination means for illuminating the original 1. ED (light emitting diode) array, 11 is a document reading position, and 12 is a light receiving line which is a light receiving position on a light receiving element. Reference numeral 13 denotes an equalizing lens for imaging to guide the reflected light from the document 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 manual signal from the system controller, and the output signal of the sensor 14 is Processes the signal and transmits it to the system controller i-roller. 32 is a pressing spring as a pressing means for pressing the above-mentioned holder 8 toward the roller 2 side; 34 is an image sensor 14 and a driving printer].
Zebra connector 135 that electrically connects the board 31 etc.
is Seal 1-Cover.

In the configuration shown below, when the conveying roller 2 rotates counterclockwise once in the direction of the arrow C in response to the insertion of the original 1, the original 1 moves upward in the direction of the arrow B due to the rotation of the roller 2.
direction to direction B'. The image information on side A (back side) of document 1 is 1. The light emitted from the LED chips of the ED array 10 is irradiated with light condensed by a rod-shaped equalizing lens 13,
The reflected light is incident on the light receiving section of the image sensor 14 via the equalizing lens 13, photoelectrically converted by the image sensor's eye, 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, manuscript] is arrow B
It is inserted from the direction, makes a U-turn in the B' direction, and is ejected. Components not explained in FIG. 1 will be explained below.

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 71) are set screws for fixing the pressing guide 7 to the holder 8, and 8a to 8c are screws from a direction perpendicular to the optical axis of the equalizing lens (for example, Selfoc lens array) 13, which is an imaging lens. This is a set screw for fixing the lens 13 to the boulder 8.

8d and 8e are holes made in the halter 8, and the lens 13 is inserted through the holes 8d and 8e from above in FIG.
It is designed to touch the sides of the screen. Therefore, the holes 8d and 8e can be used to adjust the position of the lens 13 in the optical axis direction using a sword-like protrusion of a jig (not shown) or the like.

8f and 8f' are shaft supporting holes provided on the side surface of the boulder 8, and 8f is an elongated hole and 8f' is a circular hole. 8g and 8]1 are taps installed at both ends of the holder 78, and are used to fix the plate 30 with the number of light receiving elements explained in FIG.

Reference numerals 9a and 9b are stepped holes, and from both sides of the device, through the taps provided in the knob 3, the bottle portion at the tip of the holder 8, 8f, and the circular hole 8f' are inserted.
Fits in. The holder 8 is rotatably supported around the bins 9a and 9b in the direction of arrow M in the figure.

10a to lOe are components of an LED array 10 which is illumination means. loa is a small rectangular light-emitting LED chip bonded on the LED board 101+, and lOe is a light emitting flux of this chip lOa that is condensed to the original reading position 11.
A rod-shaped lens for illuminating the original 1 located at 10d is L
Rod-shaped lenses 10e are located at both side ends of the ED depth lOa.
This is a lens house for fixing the LED board 10b to the LED board 10b. lOc is 1. This is an external resistor installed to limit and adjust the current value of the FD chip lOa, and is connected to the LED board 1.
It is soldered on 0b.

30a and 30b attach the light receiving element mounting plate 30 to the holder 8.
This is a hole through which a pair of set screws 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 a printed circuit board (J: referred to as PCB) 31, and is provided with a tap. To 30~
3On is a hook for preventing the PGl 131 from floating up, and 3C1o and 30p is a hook for catching the pressing spring 32 as a pressing means. 31
A and 31b are locking hisses for fixing the PC031 to the attached plate 30.

Third. The figure shows only the peripheral portion of the image sensor 14 shown in FIG. 1 in an enlarged manner. Here, the eye is a low-hardness protective mold that covers the solid-state light-receiving element and bonding part of the image sensor 14 from dust and external pressure, and 14a is the low-hardness molding F1.
4b is a non-light-transmitting mold frame to prevent stray light from entering the light receiving section, and j4c is the glass 1 of the image sensor H in the mold frame 1.4a.
This is the part that covers the end face of 4d. Low hardness mold Nb
and the mold frame 14a cover the upper surface and end portions of the light-transmitting substrate crow 14d of the image sensor 14, and block light except for the portion where optical information is incident.

The purpose of this reading unit is to condense the radiant light from the surface of the original 1 onto the image sensor module 13 using the equalizing lens 13, and output the intensity of the light from the image sensor module 13. If the mold frame 14a is translucent or there is no frame end 14c, the light incident directly or from the glass end surface of the substrate +4d may be irradiated several times. After being reflected within the glass, it reaches the light receiving section, and as a result, the image output information may be entirely white, only a portion may be white, or only a portion may be white and then become black and smeared, thereby conveying correct information. I won't be able to do it. Therefore, in the past, stray light was reduced by providing a light shielding member on the outside of the reading unit to prevent light that was not optical information from entering the reading unit, or by providing an exterior part, but this increased manufacturing costs.
It was technically quite difficult to reduce stray light because the structure is such that outside light inevitably enters the document entrance.

In this embodiment, an end portion 1 is provided on the drying belt frame +4a using a non-transparent material to prevent stray light from coming from the glass end surface of the substrate 14d.
4c on the end face of the glass substrate 4d, thereby almost completely covering the optical input other than the normal route with a non-transparent material. It has become possible to read images extremely easily and at low cost.

That is, in this embodiment, non-transparent materials +4a to 14c are used to cover the glass substrate +4d on which the light-receiving element is bonded by vapor deposition, etching, etc., except for the portion 36 where optical information is incident.
By enclosing and covering the light, stray light can be prevented without providing a large-scale light-shielding structure like in the past.

Note that the same effect can be obtained by printing or painting a non-transparent substance on the surface of the glass substrate 14d instead of the mold frame 14a or mold +4b. At this time, the entire area other than the used area of the wiring printed portion formed on the surface of the glass substrate +4d may be completely covered with a non-transparent ground plane to block light. Furthermore, the same effect as described above can be obtained by making the end surface of the glass substrate +4d into a frosted glass shape so that even if strong light is incident, the light is diffused and stray light does not reach the image sensor.

[Effects of the Invention] As explained above, according to the present invention, the surface of the glass substrate of the light-receiving element is completely surrounded by a non-light-transmitting substance or object, making it easy to prevent stray light. Accurate image information can be read, and large-scale light-shielding structures are not required, which has the advantage of reducing manufacturing costs and space design.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing the configuration of an embodiment of the present invention, FIG. 2 is a perspective view showing the detailed configuration of the document reading unit in FIG. 1, and FIG. 3 is the image sensor in FIG. 1. It is a vertical cross-sectional view showing the structure of the 1,000 joule portion in enlarged detail. 1...Original, 8...Reading unit structure (holder), IO...L
ED array, 13... Equalization lens (Selfoc lens array), 14... Image sensor - 1,000 joules, 14a, +4
c...Mold frame, +4b...Low hardness mold (protector), 14d
...Glass substrate, 30...Light receiving element mounting plate, 31...Printed circuit board, 34...Connector. 9ζ North I! 1”Q image, no. 9th season rate (arrival deaf figure-'21Ω-)

Claims (1)

[Scope of Claims] 1) In an image reading device that converts optical information incident from an optical system into an electrical signal by a photoelectric conversion element provided on a transparent substrate, the light transmitting portion other than the portion where the optical information is incident is provided. 1. An image reading device characterized in that substantially the entire surface of a transparent substrate is covered with a non-transparent substance or object. 2) In the apparatus according to claim 1, the non-light-transmitting substance or object is a low-hardness mold that protects the photoelectric conversion element and a mold frame that prevents the mold from flowing out and blocks light. An image reading device characterized by: