JPH09284474A - Perfect contact type image sensor and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a manufacturing cost for a perfect contact type image sensor with a guiding means having good wear resistance. SOLUTION: A photoelectric conversion element for reading a picture is formed at a slit provided for the guiding means 3 consisting of a thin and long corrosion resistance plate to which polyester is adhered at least on its rear face. A translucent substrate 1 thicker than the guiding means 3 is fitted so as to make its surface the same face as the surface of the guiding means 6o fix the guiding means 3 and the translucent substrate 1 within dies 6 and 7. Then a liquid crystal polymer 9 is made to flow into a gap surrounded by the rear face of the guiding means 3, a part projected from the guide means 3 at the side face of the translucent substrate 1 and the inner faces of the dies 6 and 7 and solidified.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a perfect contact type image sensor used in an image reading section of a facsimile, a copying machine or the like, and a manufacturing method thereof.

[0002]

2. Description of the Related Art Conventionally, since an image sensor used in an image reading apparatus such as a facsimile machine or a copying machine has a lens system, it has a drawback that the size of the apparatus is inevitable.

Therefore, recently, there has been developed a perfect contact type image sensor capable of reading a document at the same size without using a lens system. A perfect contact image sensor is usually a transparent transmissive recording plate made of metal such as chrome and aluminum and a semiconductor such as amorphous silicon. It is molded integrally with the circuit. Since it is difficult to attach this translucent substrate directly to the device casing, the translucent recording plate and the guide means for guiding the original are integrated, and the translucent recording plate is fixed to the device casing through the guide means. Then, the electric circuit on the transparent substrate was connected to the external wiring.

As a perfect contact type image sensor in which such a translucent substrate and guide means are integrated, it is disclosed in Japanese Patent Laid-Open No. 3-2.
Japanese Patent Publication No. 19759 discloses a technique in which a flexible guide means is provided on the original feeding side of a translucent substrate. Next, a method of manufacturing a conventional perfect contact type image sensor will be described with reference to FIG.

A photoelectric conversion element (not shown) is formed by a semiconductor process, and a transparent substrate 1 having a transparent protective layer 2 provided on the photoelectric conversion element is fixed to a base plate 10 (FIG. 3).
(A)).

The base plate 10 is attached to the support base 13 (FIG. 3 (b)).

A mold 11 for forming guide means is attached so as to be in direct contact with the surface of the transparent protective layer 2 on the transparent substrate 1 (FIG. 3 (c)). The mold 11 is provided with an injection port 12 for injecting the material forming the guide means. The material of the mold 11 needs elasticity and mold release, and silicon, rubber or the like is preferably used.

Injection port 12 of mold 11 for forming guide means
From the mold 1 using an injector, eg dispenser 14.
1, the base plate 10 is filled with the material 4 forming the guide means in the space formed by the substrate 1 and the pointing pair 13 (FIG. 3D). After the filling is completed, the material 4 is cured.

After the material 4 has hardened, the mold 11 is removed. At this time, a burr 15 is generated due to the influence of the injection port 12 (FIG. 3 (e)).

The burr 15 is removed to complete a complete contact type image sensor in which the transparent substrate 1, the base plate 10 and the guide means are integrated.

As a countermeasure against wear, the material 4 is hardened and the guide means 18 from which the burrs 15 have been removed are covered with a coating material 16 having a thickness of 100 μm or less as shown in FIG. 3 (f).

[0012]

In the above-mentioned conventional method for manufacturing a perfect contact type image sensor, after the guide means made of an organic material integrated with the translucent substrate is molded, the guide means is provided with a measure against wear. There is a problem that the manufacturing cost becomes high because it is necessary to cover the document feeding side with the coating material. Further, also in the molding step of the guide means, there is a problem that the manufacturing cost cannot be reduced because the resin is cured and the burr is removed after the resin is cured.

[0013]

A perfect contact type image sensor of the present invention comprises a guide means composed of a thin and elongated corrosion-resistant sheet metal having a polyester attached to at least a back surface, and a surface provided in a slit provided in the guide means. A translucent substrate having a photoelectric conversion element for reading an image formed on the same surface as the front surface of the guide means and thicker than the guide means; and a back surface of the guide means and a side surface of the translucent substrate. It is provided with a liquid crystal polymer that adheres closely.

According to the method of manufacturing a perfect contact type image sensor of the present invention, a photoelectric conversion element for reading an image is provided in a slit provided in a guide means made of a thin and long corrosion-resistant sheet metal having a polyester attached to the back surface. The translucent substrate which is formed and is thicker than the guide means is fitted so that the surface thereof is flush with the surface of the guide means, and the guide means and the translucent substrate are fixed in a mold, and the liquid crystal polymer is guided by the guide. The adhesive tape is preferably applied to the surface of the guide means by pouring into a gap surrounded by the back surface of the means, the side surface of the transparent substrate protruding from the guide means and the inner surface of the mold. Affixing the translucent substrate to the slit of the guide means and fixing the translucent substrate surface affixed to the adhesive tape in a mold, Nested id means and the transparent substrate is provided in said mold when it is fixed in the mold so as to press the rear surface of the translucent Symbol plate.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Next, a method for manufacturing a perfect contact type image sensor according to an embodiment of the present invention will be described in detail with reference to the drawings.

1A to 1F are views showing a manufacturing method according to an embodiment of the present invention.

A slender shape corrosion-resistant sheet metal (thickness 0.2
mm) is attached to the surface of the guide means 3 (the upper surface in FIG. 1A) so as to cover the slit provided in the guide means 3, and then the tape 5 of the guide means 3 is attached. The light-transmissive substrate 1 is fitted into the slit of the guide means 3 with the surface facing downward, and is attached and fixed to the adhesive side of the tape 5. FIG. 1A shows a state in which this is reversed. By setting the size of the slit of the guide means 3 to the outer size of the transparent substrate 1 plus about 0.02 mm, the work of fitting the transparent substrate 1 into the slit can be facilitated.
Further, since the adhesive tape 5 is peeled off in a later process, complicated work such as positioning is not required. Here, the light-transmissive substrate 1 is made of boro-acid glass and has a sensor portion formed on the upper surface and a side edge cut by a diamond cutter. The material of the corrosion-resistant sheet metal forming the guide means 3 is SU
304.

The transparent substrate 1 and the guide means 3 fixed to the tape 5 are fitted into the recesses 19 of the movable mold 7 and then the fixed mold 6 and the movable mold 7 are closed (see FIG. 1).
(B)). At this time, the translucent substrate 1 is pressed and held by the fixed-side mold 6 by the spring mechanism 8 provided in the movable-side mold 7. As shown in FIG. 3, the spring mechanism 8 uses a spring 20 to fix the insert 17 of the movable mold 7 in contact with the transparent substrate 1 to absorb the variation of the thickness of the transparent substrate 1 of ± 0.1 mm. It is pressed against the mold 6, and when the transparent substrate 1 is scattered to the thick side, the spring 20 shrinks downward so that the transparent substrate 1 is not damaged, and when it is scattered to the thin side. Extends upward and securely holds the transparent substrate 1 so that it does not rattle. Since the compressive load resistance of the transparent substrate 1 is 500 kgf, three springs 20 having a load resistance of 165 kgf are used.

Before closing the molds 6 and 7, the nest 17
Is pushed by the spring 20 and the tip projects from the bottom surface of the recess 19, but the step 21 of the insert collides with the step provided in the hole of the movable mold 7 from the bottom of the recess 22 of the tip of the insert 17. Since the protrusion amount is about 0.1 mm at the maximum, the translucent substrate 1 and the guide means are formed in the concave portion 1.
Nesting 17 does not get in the way when it is fitted in 9.

The nest 17 is located at the center of the recess 19,
The side of the guide means 3 is formed so that a gap 22 is formed between the side of the guide means 3 and the guide means 3 in which it is fitted, except for the peripheral edge portion and the portion of the insert 17.

After closing the molds 6 and 7, the gap 2
2. Thermoplastic liquid crystal polymer with good fluidity (Novaculate E manufactured by Mitsubishi Engineering Plastics Co., Ltd.)
322G30) 9 is poured, and the side surface of the translucent substrate 1 protruding below the guide means 3 is brought into close contact with the side surface using the surface roughness of the side surface. The surface is melted by the liquid crystal polymer melted as described above, and the polyester and the liquid crystal polymer 9 are fused to be integrated with the liquid crystal polymer. Further, since the liquid crystal polymer 9 contains a polyester component,
It adheres to the guide means 3 better than welding (FIG. 1).
(C)).

Since the perfect contact type image sensor reads at the same size, the length of the translucent substrate 1 is substantially the same as or longer than the width of the sheet to be read, which is considerably long. Since the thickness of the sheet metal of the guide means 3 and the liquid crystal polymer 9 to be held is kept smaller than the thickness of the translucent substrate 1, the thickness of the resin flow cross section when the liquid crystal polymer 9 is injected into the gap 22 is 0. It will be about 8 mm or less. In the case of a perfect contact image sensor that reads A4 size, the length of the transparent substrate 1 is about 2
The resin has to be made to flow to the gap 22 which is about 90 mm and is 0.8 mm or less, and the guide means 3 which is made of the corrosion-resistant sheet metal having the back surface vapor-deposited with polyester. This is L / T (flow length / wall thickness)
It is necessary to select a resin of> 360, and a liquid crystal polymer is used as this resin.

Liquid crystal polymer 9 poured into the gap 22
Solidifies immediately. After the liquid crystal polymer 9 is solidified, the fixed side mold 6 is removed from the moving side mold 7, and the transparent substrate 1 and the guide means 3 in which the liquid crystal polymer 9 is molded and integrated are released (FIG. 1 (d)). .

After the mold release, the tape 5 is peeled off from the guide means 3 and the transparent substrate 1 to obtain the perfect contact type image sensor shown in FIG. 1 (e) and FIG. 1 (f).

The method of attaching the polyester to the guide means 3 is not limited to electrostatic coating, but vapor deposition or the like is also possible.

[0026]

According to the present invention, since the guide means is made of corrosion-resistant sheet metal, the work of covering the document feeding surface with a coating material, which is a measure against wear, can be omitted.

In the present invention, the liquid crystal polymer of the thermoplastic resin is used for the amount of the organic material which is closely adhered to and integrated with the translucent substrate and the sheet metal guide means, so that the organic material can be flowed even in a length of 300 mm or more. Further, since the liquid crystal polymer is solidified immediately after being filled in the mold, it is not necessary to set the curing time of the resin.

Further, the liquid crystal polymer is poured into the mold in the longitudinal direction of the light transmissive substrate, and pressure is easily applied to the flow direction of the liquid crystal polymer so that smoothness is required and the guide means. No burr is generated on the surface of the sheet, that is, the guide surface for guiding the document, and the burr removal work can be omitted. As described above, it is possible to significantly reduce the cost by shortening the manufacturing process, and it is possible to mass-produce the perfect adhesion image sensor.

By attaching the transparent substrate and the guide means to the adhesive tape in advance, the work of attaching them to the mold becomes easy.

[Brief description of drawings]

FIG. 1 is a diagram showing a method for manufacturing a perfect contact image sensor according to an embodiment of the present invention.

FIG. 2 is a sectional view showing details of a spring mechanism in FIG.

FIG. 3 is a diagram showing a method for manufacturing a conventional perfect contact type image sensor.

[Explanation of symbols]

 1 Translucent Substrate 2 Protective Layer 3 Guide Means 4 Flexible Material 5 Tape 6 Fixed Side Mold 7 Movable Side Mold 8 Spring Mechanism 9 Liquid Crystal Polymer 10 Base Plate 11 Type 12 Injection Port 13 Support 14 Dispenser 15 Burr 16 Coat Material 17 Nesting 18 Guide means 20 Spring

Claims (4)

[Claims] 1. A guide means made of a thin and slender corrosion-resistant sheet metal having a polyester attached to at least a back surface, and a slit provided in the guide means, and a surface of the guide means is flush with the surface of the guide means. A complete contact, which comprises a transparent substrate on which a photoelectric conversion element for reading is formed and which is thicker than the guide means, and a liquid crystal polymer which adheres to the back surface of the guide means and the side surface of the transparent substrate. Type image sensor. 2. A light transmissive substrate having a photoelectric conversion element for image reading formed in a slit provided in a guide means made of a thin and long thin corrosion-resistant sheet metal having a polyester attached to at least a back surface thereof, and being thicker than the guide means. The guide means and the transparent substrate are fixed in a mold by fitting the surface so that the surface is flush with the surface of the guide means, and the liquid crystal polymer is the back surface of the guide means, the side surface of the transparent substrate. 2. A method for manufacturing a perfect contact type image sensor, comprising pouring into a gap surrounded by a portion protruding from the guide means and an inner surface of the mold to solidify. 3. An adhesive tape is attached to the surface of the guide means, a transparent substrate is fitted into a slit of the guide means, and the transparent substrate having the surface attached to the adhesive tape is fixed in a mold. The method for manufacturing a perfect contact image sensor according to claim 2, wherein 4. The mold according to claim 2, wherein when the guide means and the transparent substrate are fixed in the mold, a nest provided in the mold presses the back surface of the transparent recording plate. 3. The method for manufacturing the contact image sensor according to 3.