JP4712478B2 - Image reading apparatus and recording apparatus with image reading apparatus - Google Patents

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image reading apparatus and a recording apparatus (copier) with an image reading apparatus applied to a facsimile, a scanner, a copying machine, a multifunction machine, etc. About.

  2. Description of the Related Art Conventionally, there is an image reading apparatus called a sheet-through method in which a document is transferred in a sub-scanning direction and read by a reading unit placed at a fixed position. According to this method, when reading, the document passes while contacting the contact glass, so that dust, adhesive, adhesive, oil-based ink, correction fluid, etc. on the image surface side of the document adhere to the contact glass. Inevitable. When this deposit adheres to the reading position of the contact glass, the influence appears in the read image signal, and the image is deteriorated.

  Dust and other deposits on the contact glass are only generated as black spots in an image reading apparatus fixed on a document, whereas in a sheet-through type image reading apparatus, a so-called black streak is connected to the sub-scanning direction. The impact is much greater.

  In order to prevent such adhesion, there has been proposed a method in which a perfluoroalkyl polyether compound and polydimethylsiloxane whose side chain is modified with an amino group containing a monoaminoalkyl group or a diaminoalkyl group are coated on a plate glass (for example, (See Patent Documents 1 and 2).

However, these methods are not sufficient as an image reading apparatus for preventing image deterioration due to the reason that the antifouling property is sufficient but is not durable.
JP 2001-226145 A Japanese Patent Laid-Open No. 2001-238044

  As described above, the types of foreign matters are roughly classified into floating type and adhesive type. Floating foreign matter is dust, paper dust, toner, etc., and adhesive foreign matter is adhesive material that adheres to the contact glass. It is thought that the toner on the document is accumulated. As described above, there is a problem that floating foreign matter accumulates in the contact glass and there is a high possibility that it will lead to image degradation.

  In the technology described in the patent document, antifouling properties are imparted so as not to allow adhesion and floating foreign matter to adhere to the contact glass, and image reading is performed. As a result, the antifouling property is reduced, and adhesive and floating foreign matter adheres to the contact glass and deteriorates the image.

  The present invention has been made in consideration of the above-described circumstances, and an object thereof is to provide an image reading apparatus and the like effective for imparting antifouling properties to both adhesive and floating foreign matters and maintaining them.

  Specifically, a structure that prevents such foreign matter from adhering to the contact glass or a low surface energy antifouling layer is provided, and even if such foreign matter is present in the image reading portion of the contact glass, it is easily removed. The present invention proposes an antifouling layer structure that provides such a structure as well as wear resistance and lubricity.

  Furthermore, the present invention proposes a recording apparatus (copying machine) that can maintain high image quality at all times by having such an image reading apparatus that hardly adheres to foreign matter.

  As a result of intensive studies to solve the above-described problems, the present inventors have found that in an image reading apparatus that reads an image while conveying a document via a translucent member between the image reading unit and the document. An image reading apparatus in which an antifouling layer is provided on the surface of the translucent member facing the original, the silicon-containing perfluoropolyether compound having a hydrolyzable group in the antifouling layer, a reactive organosiloxane compound, And by adding a fluorine-substituted alkyl group-containing organosilane compound, imparting antifouling properties, wear resistance and lubricity, preventing foreign matter adhesion such as dust, preventing wear of the antifouling layer over time, It has been found that an image reading apparatus and a recording apparatus with an image reading apparatus that can solve the problem of image quality degradation can be obtained.

  In order to solve the above-described problems, the invention described in claim 1 is directed to an image reading apparatus that reads an image while conveying a document via a translucent member between the image reading unit and the document. A silicon-containing perfluoropolyether compound, a reactive organosiloxane compound, and a fluorine-substituted alkyl group-containing organosilane having an antifouling layer provided on the surface of the optical member facing the manuscript, the antifouling layer having a hydrolyzable group An image reading device containing a compound is the most important feature.

  The invention according to claim 2 is characterized in that the silicon-containing perfluoropolyether compound having a hydrolyzable group is an organosilicon compound having at least a fluorine-substituted alkyl group and a perfluoropolyether group. And

  The invention according to claim 3 is characterized in that the organosilicon compound has a molar ratio of a fluorine-substituted alkyl group to a perfluoropolyether group contained in a range of 0.1 to 10.

  The invention according to claim 4 is characterized in that the molecular weight of the silicon-containing perfluoropolyether compound having a hydrolyzable group is 1000 to 20000. To do.

  The invention according to claim 5 is the image reading apparatus according to any one of claims 1 to 4, wherein the reactive organosiloxane compound has at least a group selected from an amino group, an alkoxysilyl group, and a hydroxyl group. Features.

  The invention according to claim 6 is characterized in that the image reading apparatus according to any one of claims 1 to 5 in which the fluorine-substituted alkyl group-containing organosilane compound has a hydrolyzable group.

  The invention according to claim 7 is characterized in that the image reading apparatus according to any one of claims 1 to 6 in which the antifouling layer contains a fluorosilicone compound.

  According to an eighth aspect of the present invention, the antifouling layer in the image reading apparatus is mainly composed of two components of a silicon-containing perfluoropolyether compound having a hydrolyzable group and a fluorine-substituted alkyl group-containing organosilane compound. A first layer made of a raw material and a second layer made of a raw material mainly composed of a reactive organosiloxane compound are formed on and in contact with the first layer. The described image reading apparatus is a main feature.

The invention according to claim 9 is mainly characterized by a recording apparatus with an image reading apparatus having the image reading apparatus according to any one of claims 1 to 8 .

According to a tenth aspect of the present invention, there is provided a method for manufacturing an image reading apparatus that reads an image while conveying a document via a light transmissive member between the image reading unit and the document. An antifouling layer is provided on the surface to be treated, and the method of forming the antifouling layer mainly comprises two components, a silicon-containing perfluoropolyether compound having a hydrolyzable group and a fluorine-substituted alkyl group-containing organosilane compound. A first layer composed of a raw material as a component is formed on the translucent member , and then a second layer composed of a raw material mainly composed of a reactive organosiloxane compound is contacted on the first layer. The most important feature is a method of manufacturing an image reading apparatus having a step of forming the image reading apparatus.

The invention described in claims 11 and 12 is the invention described in claim 10 , wherein the first layer is a silicon-containing perfluoropolyether compound having a hydrolyzable group and a fluorine-substituted alkyl group-containing organosilane compound. It is formed by applying a raw material having a component as a main component onto the translucent member, or a silicon-containing perfluoropolyether compound having a hydrolyzable group and a fluorine-substituted alkyl group-containing organosilane compound. The most important feature is a manufacturing method of an image reading device, which is formed by heating a raw material mainly composed of two components on the translucent member under heating and reduced pressure .

The invention according to claim 13 and 14, antifouling layer, a silicon-containing perfluoropolyether compounds having a hydrolyzable group, as a main component reactive organosiloxane compound, and a fluorine-substituted alkyl group-containing organosilane compound In addition, a silicon-containing perfluoropolyether compound having a hydrolyzable group in the raw material, a reactive organosiloxane compound and a fluorine-substituted alkyl group-containing organosilane compound are mixed in advance. The most important feature is a method for manufacturing an image reading device, which is applied to the translucent member afterwards . The invention according to claim 15 is a raw material in which the antifouling layer is composed mainly of a silicon-containing perfluoropolyether compound having a hydrolyzable group, a reactive organosiloxane compound, and a fluorine-substituted alkyl group-containing organosilane compound. The main feature is a method for manufacturing an image reading device, characterized in that it is formed by vapor-depositing the material on the translucent member under heating and reduced pressure.

According to a sixteenth aspect of the present invention, there is provided a cleaning method for an image reading apparatus that reads an image while conveying a document via a translucent member between the image reading unit and the document, and a silicon-containing part having a hydrolyzable group. An image reading apparatus for wiping the translucent member with a cleaning substrate impregnated with a liquid component containing a fluoropolyether compound, a reactive organosiloxane compound, a fluorine-substituted alkyl group-containing organosilane compound, and a fluorosilicone compound The main feature is the cleaning method.

According to a seventeenth aspect of the present invention, there is provided a cleaning method for a recording apparatus with an image reading apparatus having an image reading apparatus that reads an image while conveying the original through a translucent member between the image reading section and the original. Translucent translucent polyether-containing compound having a decomposable group, reactive organosiloxane compound, fluorine-substituted alkyl group-containing organosilane compound, and a transparent substrate impregnated with a liquid component containing a fluorosilicone compound. The main feature is a method for cleaning an image reading device portion of a recording device with an image reading device for wiping away a sex member.

  According to the present invention, in an image reading apparatus that reads an image while conveying a document via a translucent member between the image reading unit and the document, an antifouling layer is provided on the surface of the translucent member facing the document. The anti-smudge layer contains a hydrolyzable silicon-containing perfluoropolyether compound, a reactive organosiloxane compound, and a fluorine-substituted alkyl group-containing organosilane compound. With the image reading device, the image reading position of the translucent member is free of foreign matter, dust, etc., prevents wear of the antifouling layer over time, and does not read them as image data. It is possible to obtain an image reading apparatus and a recording apparatus with an image reading apparatus that can read the image more faithfully.

  Further, the reactive organosiloxane compound used for forming the antifouling layer is a compound having an amino group, an alkoxysilyl group, or a hydroxyl group, and fluorine substitution used for forming the antifouling layer Since the alkylsilane-containing organosilane compound is a compound having a hydrolyzable group, the durability of the antifouling layer can be improved by improving the adhesion of the antifouling layer to the translucent member. An image reading apparatus that can read an image faithfully and a recording apparatus with an image reading apparatus can be realized.

  Further, the silicon-containing perfluoropolyether compound having a hydrolyzable group used for forming the antifouling layer is an organosilicon compound having at least a fluorine-substituted alkyl group and a perfluoropolyether group. Low surface energy derived from the molecular structure of the polyether group, characteristics such as molecular chain flexibility, flexibility, lubricity, and strong adhesion to the translucent member, and the molecular structure of the fluorine-substituted alkyl group It has properties such as water and oil repellency and releasability, and can form a uniformly transparent coating without causing layer separation. And since it is an organosilicon compound, a synergistic effect is exhibited by the strong adhesiveness with a translucent member. Therefore, it was possible to realize an image reading apparatus and a recording apparatus with an image reading apparatus provided with the antifouling layer having sufficient antifouling properties while preventing the antifouling layer from being worn over time.

  Moreover, in the said organosilicon compound, when the molar ratio of the fluorine-substituted alkyl group to the perfluoropolyether group is 0.1 to 10, water and oil repellency (releasability) and durability (wear resistance, lubrication) The image reading apparatus and the recording apparatus with the image reading apparatus provided with an antifouling layer excellent in the balance of both properties of the image quality could be realized.

  In addition, since the antifouling layer contains a fluorosilicone compound, the components are uniformly compatible with each other, so that optical properties (transparency) are improved, and image degradation due to optical defects in the antifouling layer. Therefore, an image reading apparatus and a recording apparatus with an image reading apparatus that can read an original image faithfully can be realized.

  In addition, the antifouling layer has a two-layer structure, and the second layer having excellent lubricity is formed on the first layer having excellent antifouling property, so that the durable antifouling layer is formed. Stain layer, an image reading device capable of reading faithfully for a long period of time can be realized. Particularly when the component forming the anti-stain layer is diluted with a perfluoro solvent, the first layer is formed by the solvent when forming the second layer. Since the swells, the adhesiveness with the second layer is also improved.

  In forming the antifouling layer, a silicon-containing perfluoropolyether compound having a hydrolyzable group, a reactive organosiloxane compound, and a silicon-free perfluoropolyether compound are preliminarily mixed before coating. As a result, the number of steps in forming the antifouling layer can be reduced.

  Further, in cleaning the translucent member, a cloth containing a hydrolyzable group-containing silicon-containing perfluoropolyether compound, a reactive organosiloxane compound, a fluorine-substituted alkyl group-containing organosilane compound, and a fluorosilicone compound is used. If the antifouling layer is contaminated, it can be easily cleaned by impregnating it with the light-transmitting member, and the performance can be restored even if the antifouling property or lubricity is deteriorated. Therefore, it is possible to realize an image reading apparatus and a recording apparatus with an image reading apparatus that can read an original image faithfully over a long period of time.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
Generally, a copying machine refers to an electrophotographic copying machine known as a so-called Carlson process. That is, an electrostatic latent image is formed on a photosensitive drum (or belt, sheet), visualized (developed) with toner, the toner image is transferred to paper, etc., and then pressed / heated. That is, a recording principle in which a toner image is fixed on paper or the like to form an image.

  The image reading apparatus of the present invention described below suitably creates image reading information and sends data to a copying machine having such a recording principle. In recent years, the ink jet recording principle has been completed and the two major recording principles exist together with the Carlson process. The image reading apparatus of the present invention is suitable not only for the Carlson process but also for an ink jet recording apparatus, and also for recording principles other than these two systems (for example, a thermal recording system using a thermal head or a thermal transfer system). Applicable. Therefore, even if the expression “copier” is used in the text, it does not simply refer to the one based on the Carlson process, but refers to all recording apparatuses having an image reading apparatus.

  By providing the antifouling layer on the contact glass, it is possible to prevent adhesion of foreign substances (glue or correction liquid). However, when a flat contact glass is mounted, the contact glass and the document are always conveyed in contact with each other.

For this reason, as the number of documents passed increases, the antifouling layer on the contact glass peels off, and the effect of preventing adhesion to adhesive foreign matter is lost. At that time, from the manuscript, cellulose fibers which are components of paper, talc, clay, calcium carbonate, titanium dioxide and other filler particles having a particle size of 0.5 to 10 μm, and coated kaolin (Al ₂ O _3. 2SiO ₂ · 2H ₂ O), calcium carbonate (CaCO ₃ ), satin white (3CaO · Al ₂ O ₃ · 3CaSO ₄ · 31 to 32H ₂ O), etc. Drops off as paper dust and adheres to the contact glass surface.

  In addition, the toner adhering to the document surface and adhesive materials such as glue used when creating the cut and pasted document also adhere to this surface. In addition, dust or the like floating in the air often adheres, and sweat or oil or the like often adheres like a fingerprint when touched carelessly. The toner, glue, sweat, fat and the like have a further adverse effect of causing other non-adhesive foreign matter to adhere to the contact glass surface.

  In the present invention, a member between the image reading unit and the document is described as a contact glass for convenience, but the present invention is not applied only to glass. A member installed between the reading unit and the document is a member that transmits light, that is, a translucent member. That is, a member that transmits light, that is, a light-transmitting member in general, such as a plastic material such as an acrylic resin including glass, is expressed as contact glass for convenience.

  By the way, normally, when an original is fixed by a copying machine or the like and the image reading unit is moved to read an image, the contamination of the contact glass surface has an influence on the final image quality. It becomes. However, when the image reading unit is fixed and the image is read by moving the document as in the present invention, even one spot-like contamination present on the contact glass surface leads to the sub-scanning direction. This results in so-called black streaks, not just a black spot-like image deterioration, but the effect is much greater.

  In order to solve such a problem, the present invention studied to make the surface of the contact glass opposite to the original as dirty as possible. Specifically, this is surface modification of the surface of the contact glass facing the document.

  In general, a layer mainly composed of a silicon-containing perfluoropolyether compound having a hydrolyzable group has a low surface energy derived from a molecular structure and a high molecular chain flexibility, flexibility, lubricity, and a high base material. It has good antifouling properties and durability due to adhesion and the like. In addition, the layer containing the reactive organosiloxane compound as a main component can suppress the adhesion of paper powder, toner, or the like to the surface layer, and can achieve improved lubricity. Furthermore, the layer mainly composed of a fluorine-substituted alkyl group-containing organosilane compound has good scratch resistance because a hard film is formed while having water repellency. Furthermore, since the fluorosilicone compound also acts as a compatibilizer between the silicon-containing perfluoropolyether compound having a hydrolyzable group and the reactive organosiloxane compound, the formed antifouling layer becomes uniform and optical properties (transparency) ) Will improve.

  In addition to the silicon-containing perfluoropolyether compound having a hydrolyzable group, the present inventors have improved the property of reducing surface friction, which is an advantage of the reactive organosiloxane compound, that is, improved lubricity, Intensive study was conducted for the purpose of improving scratch resistance with a fluorine-substituted alkyl group-containing organosilane compound.

  As a result, the antifouling layer comprising a silicon-containing perfluoropolyether compound having a hydrolyzable group, a reactive organosiloxane compound, and a raw material mainly composed of a fluorine-substituted alkyl group-containing organosilane compound is excellent. Have been found to have durability and durability.

  The silicon-containing perfluoropolyether compound having a hydrolyzable group is not particularly limited, and examples thereof include compounds represented by the following general formula (I) or (II).

（式中、Ｒｆ^１は炭素数１〜１００の直鎖状パーフルオロアルキル基、Ｘは水素原子または炭素数１〜５のアルキル基、Ｒ^１は加水分解可能な基、ａは１〜１００の整数、ｂは０〜２の整数、ｃは１〜１０の整数）

(In the formula, Rf ¹ is a linear perfluoroalkyl group having 1 to 100 carbon atoms, X is a hydrogen atom or an alkyl group having 1 to 5 carbon atoms, R ¹ is a hydrolyzable group, and a is 1 to 100. An integer, b is an integer of 0-2, c is an integer of 1-10)

（式中、Ｒｆ^２は炭素数１〜１００の直鎖状パーフルオロアルキル基、Ｘは水素原子または炭素数１〜５のアルキル基、Ｒ^１は加水分解可能な基、ａは１〜１００の整数、ｂは０〜２の整数、ｃは１〜１０の整数）

(In the formula, Rf ² is a linear perfluoroalkyl group having 1 to 100 carbon atoms, X is a hydrogen atom or an alkyl group having 1 to 5 carbon atoms, R ¹ is a hydrolyzable group, and a is 1 to 100. An integer, b is an integer of 0-2, c is an integer of 1-10)

Examples of the hydrolyzable group represented by R ¹ include an amino group, an alkoxy group, a chlorine atom, and the like. In the case of an alkoxy group, an alkyl group having 1 or 2 carbon atoms is preferable.

  These compounds used in the present invention are preferably those having a molecular weight of 1,000 to 20,000, particularly 2,000 to 10,000, from the viewpoint of good film formability. Those having a molecular weight of less than 1000 are inferior in antifouling properties and abrasion resistance, and those having a molecular weight in excess of 20000 are not preferred because of poor film formability and poor workability due to high viscosity.

  Furthermore, the silicon-containing perfluoropolyether compound having a hydrolyzable group and having at least a fluorine-substituted alkyl group and a perfluoropolyether group includes the following general formula (III) or (IV): A compound having a structure represented by is more preferably used.

（式中、Ｒｆ^１は炭素数１〜１００の直鎖状パーフルオロアルキル基、Ｙは水素原子または炭素数１〜５のアルキル基またはハロゲン原子、Ｒ^１は加水分解可能な基、Ｒ^２は炭素数１〜３のアルキル基、ｄは１〜１００の整数、ｅは１〜３の整数、ｆは０〜２の整数、ｅ＋ｆ＝３）

(Wherein Rf ¹ is a linear perfluoroalkyl group having 1 to 100 carbon atoms, Y is a hydrogen atom or an alkyl group or halogen atom having 1 to 5 carbon atoms, R ¹ is a hydrolyzable group, R ² is An alkyl group having 1 to 3 carbon atoms, d is an integer of 1 to 100, e is an integer of 1 to 3, f is an integer of 0 to 2, e + f = 3)

The molar ratio of the fluorine-substituted alkyl group (Rf ¹ ) to the perfluoropolyether group (OCF ₂ CF ₂ CF ₂ ) is preferably from 0.1 to 10. When the molar ratio is less than 0.1, the water and oil repellency of the antifouling layer is lowered, so that the releasability is also lowered. When the molar ratio exceeds 10, it is not preferable because paper dust and dust are likely to adhere electrostatically, and the flexibility and lubricity of the antifouling layer are lowered and the durability is lowered.

（式中、Ｒｆ^１は炭素数１〜１００の直鎖状パーフルオロアルキル基、Ｙは水素原子または炭素数１〜５のアルキル基またはハロゲン原子、Ｒ^１は加水分解可能な基、Ｒ^２は炭素数１〜３のアルキル基、ｄは１〜１００の整数、ｅは１〜３の整数、ｆは０〜２の整数、ｅ＋ｆ＝３）

(Wherein Rf ¹ is a linear perfluoroalkyl group having 1 to 100 carbon atoms, Y is a hydrogen atom or an alkyl group or halogen atom having 1 to 5 carbon atoms, R ¹ is a hydrolyzable group, R ² is An alkyl group having 1 to 3 carbon atoms, d is an integer of 1 to 100, e is an integer of 1 to 3, f is an integer of 0 to 2, e + f = 3)

The molar ratio of the fluorine-substituted alkyl group (Rf ₁ ) to the perfluoropolyether group (OCF ₂ CF ₂ ) is preferably from 0.1 to 10. When the molar ratio is less than 0.1, the water and oil repellency of the antifouling layer is lowered, so that the releasability is also lowered. When the molar ratio exceeds 10, it is not preferable because paper dust and dust are likely to adhere electrostatically, and the flexibility and lubricity of the antifouling layer are lowered and the durability is lowered.

  As the reactive organosiloxane compound, compounds containing structures represented by the following general formulas (V) and (VI) are used, and those having a molecular weight of 300 to 50,000, particularly 1,000 to 20,000 are preferable.

（式中、Ｒ_３およびＲ_４は水素原子、またはフッ素で置換されていても良い炭素数１〜５のアルキル基、またはフッ素で置換されていても良いフェニル基のいずれかを表し、Ｒ_３とＲ_４は同一でも異なっていても良い）

(In the formula, R ₃ and R ₄ represent either a hydrogen atom, an alkyl group having 1 to 5 carbon atoms which may be substituted with fluorine, or a phenyl group which may be substituted with fluorine, and R ₃ And R ₄ may be the same or different)

（式中、Ｒ_２は炭素数１〜３のアルキル基、Ｚはアミノ基、アルキル部分の炭素数が１〜３のアルコキシ基、または水酸基を表す）

(Wherein R ₂ represents an alkyl group having 1 to 3 carbon atoms, Z represents an amino group, an alkoxy group having 1 to 3 carbon atoms in the alkyl portion, or a hydroxyl group)

  The fluorine-substituted alkyl group-containing organosilane compound is not particularly limited, and examples thereof include compounds represented by the following general formula (VII) or (VIII). These compounds used in the present invention preferably have a molecular weight of 300 to 1000 from the viewpoint of good film formability.

（式中、Ｒ_２は炭素数１〜３のアルキル基、Ｒ_５は炭素数１〜５のアルキレン基、ｐは１以上の整数）

(Wherein R ₂ is an alkyl group having 1 to 3 carbon atoms, R ₅ is an alkylene group having 1 to ₅ carbon atoms, and p is an integer of 1 or more)

（式中、Ｒ_５は炭素数１〜５のアルキレン基、ｑは１以上の整数）

(Wherein R ₅ is an alkylene group having 1 to ₅ carbon atoms, and q is an integer of 1 or more)

For example, as the fluorine-substituted alkyl group-containing organosilane compound represented by the general formula (VII), CF ₃ CH ₂ CH ₂ Si (OCH ₃ ) ₃ , nC ₈ F ₁₇ CH ₂ CH ₂ Si (OCH ₃ ) ₃ etc. are mentioned.

Further, for example, as the fluorine-substituted alkyl group-containing organosilane compound represented by the general formula (VIII), CF ₃ CH ₂ CH ₂ Si (NH ₂ ) ₃ , nC ₃ F ₇ CH ₂ CH ₂ Si (NH _{2) 3, n-C 4} F 9 CH 2 CH 2 Si (NH 2) 3, n-C 6 F 13 CH 2 CH 2 Si (NH 2) 3, n-C 8 F 17 CH 2 CH 2 Si ( NH ₂ ) _{3 and the} like.

  The fluorine-containing organosilicon disclosed in JP-A-10-264264, JP-A-2002-156767, JP-A-2004-86011 and the like corresponds to the fluorine-substituted alkyl group-containing organosilane compound in the present invention. To do.

  The fluorosilicone compound is not particularly limited, and examples thereof include a compound containing a structure represented by the following general formula (IX). These compounds used in the present invention have film-forming properties and compatibility. From the viewpoint that the molecular weight is good, those having a molecular weight of 300 to 50,000, particularly 500 to 20,000 are preferred.

（式中、Ｒｆ_２は少なくとも１つの水素原子がフッ素原子で置換されている炭素数１〜５のアルキル基または少なくとも１つの水素原子がフッ素原子で置換されているフェニル基、Ｒ_３は水素原子、またはフッ素で置換されていても良い炭素数１〜５のアルキル基、またはフッ素で置換されていても良いフェニル基のいずれかを表す）

(Wherein Rf ₂ is an alkyl group having 1 to 5 carbon atoms in which at least one hydrogen atom is substituted with a fluorine atom, or a phenyl group in which at least one hydrogen atom is substituted with a fluorine atom, and R ₃ is a hydrogen atom. Or an alkyl group having 1 to 5 carbon atoms which may be substituted with fluorine, or a phenyl group which may be substituted with fluorine)

  Hereinafter, a reading apparatus to which the present invention is applied will be described in detail with reference to the drawings. FIG. 1 is a schematic diagram illustrating a document reading / conveying device (ADF) and a reading device.

  In FIG. 1, the paper feed / separation unit (F) sequentially conveys the originals (P) stacked on the original table (2) one by one from the top. The bottom plate (4) supports the document feeding side on the document table (2) and raises it to a position in contact with the calling roller (5). The paper feeding member (6) rotates in the paper feeding direction and takes in the original (P) called by the calling roller (5), and the separation member (7) rotates in the direction opposite to the paper feeding direction and is fed. Only the topmost sheet of the document (P) is separated. The transport section (9) transports the original (P) transported from the paper feed / separation section to a reading position on the contact glass (3). The transport roller pair (8), (8a), intermediate transport rollers ( 11), (11a), and the like.

  After the original (P) held between the pair of conveying rollers (8) and (8a) moves on the contact glass (3) and is scooped by the main body side guide (20c) of the apparatus main body (20), While the document (P) is held between the transport roller pair (8), (8a) and the intermediate transport rollers (11), (11a), the document (P) is stretched and the contact glass (3) The state of non-contact and the contact surface with the reading guide member (21) are kept small.

  The reading unit (1) for reading the image surface of the original (P) is provided in the apparatus main body (20) below the contact glass (3), and in the horizontal direction of the figure below the contact glass (3) when reading the image. It can be moved or stopped below the reading position. The paper discharge unit discharges the read original (P) to the paper discharge tray (15). The ADF (10) of the present embodiment is connected to the apparatus main body (20) by a connecting member such as a hinge (not shown), and a start signal is sent to the ADF side by depressing the start button in the operation unit of the apparatus main body (20). Accordingly, the sheets are fed one by one in order from the top.

  An original of the contact glass (3) whose guide surface is a predetermined amount higher than the original paper passing surface of the contact glass (3) by a reading device that conveys the original (P) on the contact glass (3) at a predetermined speed and reads an image. It is formed upstream of the original reading line position on the transport surface. The main body side guide (protruding member) (20c) has an inclined surface for scooping up the original (P) from the original passing surface of the contact glass (3) at the downstream end of the contact glass (3), and the contact glass (3). On the upper surface, a document pressing member (21) that suppresses the upward fluttering of the document (P) is disposed.

  In the present embodiment, the ADF (10) transports the documents one by one, and reads the image while passing over the contact glass (3) of the reading device (1). Reading of an image is performed by the reading device (1).

  The image on the document (P) passes through the mirrors (31), (32), (33) and the lens (34) of the reading device (1), and the image data captured by the CCD (35) is subjected to image processing. Are sent to the printer unit and output. Thus, every time the document (P) repeatedly passes through the surface of the contact glass (3), the normal antifouling layer is greatly shaved and carried by the document (P) and disappears from the surface of the contact glass (3). It is difficult to maintain the antifouling effect. According to the present invention, lubricity and wear resistance can be imparted, and the antifouling property over time can be maintained.

EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited to these examples.
The performance evaluation of the translucent member (contact glass (3)) provided with the antifouling layer of the present invention and the evaluation of the image reading apparatus were carried out as follows.
(1) Antifouling property Using a sample subjected to surface modification as in the following examples as a translucent member, after paper dust was sprayed, the residual state of paper dust when blown off with a blower, After the toner was sprayed, the residual state of the toner when it was blown off with a blower, and the residual state of the stain when wiped off with a fingerprint were evaluated.
(2) Durability Using a translucent member on which an antifouling layer is formed in accordance with the embodiment as a contact glass (3) of an actual electrophotographic digital copying machine reading section, a document with an acrylic adhesive double-sided tape attached is used. After passing a large number of sheets, pass a large number of halftone originals, evaluate image deterioration such as black streaks and paper jams (initial), and perform the same evaluation after passing 100,000 sheets to generate black streaks. Whether image deterioration such as presence or absence of image occurred was evaluated (over time). The results are shown in Table 1.

Example 1
Silicon-containing perfluoroether compound having a hydrolyzable group represented by the following formula (X) (molecular weight: about 5000), reactive organosiloxane compound: DMS-S15 (manufactured by Chisso Corporation), and the following formula (XI) A 0.1 wt% solution obtained by diluting a mixture of fluorine-substituted alkyl group-containing organosilane compounds represented by) with perfluorohexane, float glass (manufactured by Nippon Sheet Glass Co., Ltd., chemically strengthened glass FL3.2) Was dipped in this solution and applied at a speed of 15 cm / min. After coating, the solvent was volatilized by leaving it at room temperature for a whole day and night to obtain a translucent member on which an antifouling layer (film thickness: about 0.03 μm) was formed.

Example 2
An antifouling layer (film thickness: about 0.03 μm) was obtained in the same manner as in Example 1 except that a compound represented by the following formula (XII) was used as the silicon-containing perfluoroether compound having a hydrolyzable group. The formed translucent member was obtained.

Example 3
A silicon-containing perfluoropolyether compound having a hydrolyzable group represented by the following formula (XIII) (molecular weight: about 4000) and a fluorine-substituted alkyl group having a hydrolyzable group represented by the formula (XI) A 0.1 wt% solution obtained by diluting an organosilane compound with perfluorohexane was prepared, and the first antifouling layer (film thickness: about 0.03 μm) was formed in the same manner as in Example 1. A member was obtained.

  Further, a 0.1 wt% solution prepared by diluting reactive organosiloxane compound: DMS-S15 (manufactured by Chisso Corporation) with perfluorohexane was prepared, and the same method as in Example 1 was applied to the first antifouling layer. A translucent member in which a second antifouling layer (film thickness: about 0.05 μm in total) was formed was obtained.

Example 4
The same method as in Example 3, except that a silicon-containing perfluoropolyether compound having a hydrolyzable group represented by the following formula (XIV) (Rf ₁ / (OCF ₂ CF ₂ ) = 1.1) was used. Thus, a translucent member having a first antifouling layer (film thickness: about 0.03 μm) was obtained.

  Further, a 0.1 wt% solution prepared by diluting reactive organosiloxane compound: DMS-S15 (manufactured by Chisso Corporation) with perfluorohexane was prepared, and the same method as in Example 1 was applied to the first antifouling layer. A translucent member in which a second antifouling layer (film thickness: about 0.05 μm in total) was formed was obtained.

Example 5
Silicon-containing perfluoroether compound having a hydrolyzable group: OPTOOL DSX (instead of a silicon-containing perfluoropolyether compound having a single hydrolyzable group, a mixture of the formulas (X), (XII), (XIII) Equivalent, manufactured by Daikin Industries, Ltd.), fluorine-substituted alkyl group-containing organosilane compound having a hydrolyzable group: KBM7803 (manufactured by Shin-Etsu Chemical Co., Ltd.), and reactive organosiloxane compound: DMS-S15 (Chisso ( A 0.1 wt% solution was prepared by diluting the mixture of (made by Co., Ltd.) with perfluorohexane. A stainless sintered filter (pore diameter 80-100 μm, diameter 18 mmφ, thickness 3 mm) impregnated with 0.15 ml of the solution was set in a vacuum deposition apparatus, and the entire sintered filter was heated by an electron gun to prevent it. A translucent member having a dirty layer (film thickness: about 0.02 μm) was obtained.
* Vacuum degree: 3.1 × 10 ^{−4 to} 8.0 × 10 ⁻⁴ Pa (2.3 × 10 ^{−6 to} 6.0 × 10 ⁻⁶ Torr), acceleration voltage: 6 kV, applied current: 40 mA, irradiation Area: 3.5 × 3.5 cm ² , deposition time: 5 seconds

Example 6
Silicon-containing perfluoroether compound having a hydrolyzable group: OPTOOL DSX (instead of a silicon-containing perfluoropolyether compound having a single hydrolyzable group, a mixture of the formulas (X), (XII), (XIII) Equivalent product, manufactured by Daikin Industries, Ltd.), fluorine-substituted alkyl group-containing organosilane compound having hydrolyzable group: KBM7803 (manufactured by Shin-Etsu Chemical Co., Ltd.), reactive organosiloxane compound: DMS-S15 (Chisso Corporation) )), And a mixture of fluorosilicone compound: FMS-9921 (manufactured by Chisso Corp.) was diluted with perfluorohexane to prepare a 0.1 wt% solution. Using the solution, a translucent member having an antifouling layer (film thickness: about 0.02 μm) formed in the same manner as in Example 1 was obtained.

Example 7
Silicon-containing perfluoroether compound having a hydrolyzable group: OPTOOL DSX (instead of a silicon-containing perfluoropolyether compound having a single hydrolyzable group, a mixture of the formulas (X), (XII), (XIII) Equivalent, manufactured by Daikin Industries, Ltd.), and a fluorine-substituted alkyl group-containing organosilane compound having a hydrolyzable group: KBM7803 (manufactured by Shin-Etsu Chemical Co., Ltd.) diluted with perfluorohexane to 0.1% by weight A solution was prepared. The solution was evaporated in the same manner as in Example 4 to obtain a translucent member on which a first antifouling layer (film thickness: about 0.02 μm) was formed. Thereafter, a 0.1 wt% solution prepared by diluting reactive organosiloxane compound: DMS-S15 (manufactured by Chisso Corporation) with perfluorohexane was prepared, and the first antifouling was conducted in the same manner as in Example 4. The translucent member in which the 2nd antifouling layer (film thickness: total about 0.04 micrometer) was formed on the layer was obtained.

Example 8
After carrying out durability evaluation with the translucent member created in Example 6, the same solution was impregnated in a non-woven fabric (Asahi Kasei Kogyo Co., Ltd., Bencott M-3) to wipe the translucent member surface. did. The same evaluation was performed again using the sample.

Comparative Example 1
Fluorosurf FG-5010 (Fluorocoating material manufactured by FluoroTechnology Co., Ltd., a solution in which a fluororesin is dissolved in a non-flammable fluorine solvent or an organic solvent, dried at room temperature after coating to form a coating film. Used for low friction applications. A translucent member on which an antifouling layer (film thickness: about 0.5 μm) was formed was spray-coated with a high adhesion and high hardness property.

Comparative Example 2
KBM7803 :( fluorine-containing silane coupling agent (Shin-Etsu Chemical Co., _{Ltd.) C 8 F 17 CH 2 CH} 2 Si (OCH 3) 3, solvent does not contain active ingredient 100% solution, colorless transparent liquid, viscosity 4cSt, specific gravity 1.53, refractive index 1.3300) was spray coated to obtain a translucent member on which an antifouling layer (film thickness: about 0.01 μm) was formed.

Comparative Example 3
KP801M: Water repellent surface treatment agent (manufactured by Shin-Etsu Chemical Co., Ltd.), m-xylene hexafluoride solution, colorless and transparent, viscosity 0.6 cSt, specific gravity 1.4, active ingredient 3% water repellent surface treatment agent Spray coating is possible without dilution) to obtain a translucent member on which an antifouling layer (film thickness: about 0.01 μm) is formed.

Comparative Example 4
An antifouling layer (film thickness: about 0.03 μm) was formed in the same manner as in Example 1 except that the silicon-containing perfluoropolyether compound having a hydrolyzable group represented by the formula (X) was removed. A translucent member was obtained.

Comparative Example 5
The float glass was evaluated as contact glass with no treatment.
*Evaluation results

＊評価基準
◎：防汚効果が大きく、実用的である。
○：防汚効果が認められ、実用上問題なし。
△：防汚効果は認められるが、実用に際して問題が生じる可能性あり。
×：防汚効果は認められるが、実用性に乏しい。
−：光の透過性が悪く、評価せず。
＊総合評価結果は以上の評価を踏まえ、実用に供するかを示しており、
優＞良＞不良の順で実用面への良好度を表現している（優が最適）。

* Evaluation criteria ◎: Antifouling effect is large and practical.
○: Antifouling effect is recognized and there is no practical problem.
Δ: Antifouling effect is observed, but problems may occur in practical use.
X: Antifouling effect is recognized, but practicality is poor.
−: Poor light transmittance, not evaluated.
* The overall evaluation results indicate whether the results will be put to practical use based on the above evaluations.
Expresses goodness to practical use in the order of excellent>good> defective (excellent is optimal).

  From the above results, the antifouling layer comprising a silicon-containing perfluoropolyether compound having a hydrolyzable group, a reactive organosiloxane compound, and a fluorine-substituted alkyl group-containing organosilane compound has a high antifouling effect and is durable. I found it excellent.

  Further, by providing a second layer made of a reactive organosiloxane compound on the first layer made of at least a silicon-containing perfluoropolyether compound having a hydrolyzable group and a fluorine-substituted alkyl group-containing organosilane compound. It was found that the durability was further improved.

  In addition, if it is an antifouling layer containing a silicon-containing perfluoropolyether compound having a hydrolyzable group, a reactive organosiloxane compound, and a fluorine-substituted alkyl group-containing organosilane compound, only a single layer composed of a mixture of each component can be used. It was found that sufficient antifouling properties and durability can be obtained.

  Furthermore, by adding a fluorosilicone compound to a silicon-containing perfluoropolyether compound having a hydrolyzable group, a reactive organosiloxane compound, and a fluorine-substituted alkyl group-containing organosilane compound, the compatibility of each component is increased, thereby preventing it. An image reading apparatus capable of faithfully reading an original image and a recording apparatus with an image reading apparatus, because the optical characteristics (transparency) of the dirty layer are improved and image deterioration due to optical defects of the antifouling layer is suppressed. Realized.

1 is a schematic configuration diagram of a document reading and conveying apparatus to which the present invention is applied.

Explanation of symbols

1 Reading device 2 Document table 3 Contact glass (An antifouling layer is formed on the top layer)
4 Bottom plate 5 Calling roller 6 Paper feed member 7 Separating member 8, 8a Conveying roller pair 9 Conveying section 10 ADF
11, 11a Intermediate transport roller 15 Paper discharge tray 20 Main body 20c Main body side guide 21 Document pressing members 31, 32, 33 Mirror 34 Lens 35 CCD
F Feeding / separating part P Original

Claims (17)

  In an image reading apparatus that reads an image while conveying a document via a translucent member between the image reading unit and the document, an antifouling layer is provided on the surface of the translucent member facing the document, An image reading apparatus, wherein the soil layer contains a silicon-containing perfluoropolyether compound having a hydrolyzable group, a reactive organosiloxane compound, and a fluorine-substituted alkyl group-containing organosilane compound.   2. The image reading apparatus according to claim 1, wherein the silicon-containing perfluoropolyether compound having a hydrolyzable group is an organosilicon compound having at least a fluorine-substituted alkyl group and a perfluoropolyether group. The image reading apparatus according to claim 2 , wherein the organosilicon compound has a fluorine-substituted alkyl group molar ratio of 0.1 to 10 with respect to a perfluoropolyether group contained therein.   4. The image reading apparatus according to claim 1, wherein the silicon-containing perfluoropolyether compound having a hydrolyzable group has a molecular weight of 1000 to 20000. 5.   The image reading apparatus according to claim 1, wherein the reactive organosiloxane compound has at least a group selected from an amino group, an alkoxysilyl group, and a hydroxyl group.   The image reading apparatus according to claim 1, wherein the fluorine-substituted alkyl group-containing organosilane compound has a hydrolyzable group.   The image reading apparatus according to claim 1, wherein the antifouling layer contains a fluorosilicone compound.   The antifouling layer in the image reading device includes a first layer composed of a raw material mainly composed of two components, a silicon-containing perfluoropolyether compound having a hydrolyzable group and a fluorine-substituted alkyl group-containing organosilane compound; 8. The image reading according to claim 1, wherein a second layer made of a raw material mainly composed of a reactive organosiloxane compound is formed on the first layer. apparatus. Image reading apparatus with a recording apparatus characterized by having an image reading apparatus according to any one of claims 1 to 8. In a method of manufacturing an image reading apparatus that reads an image while conveying a document via a light-transmitting member between the image reading unit and the document, the light-transmitting member is provided with an antifouling layer on a surface facing the document. The antifouling layer is formed from a raw material mainly composed of two components of a hydrolyzable group-containing silicon-containing perfluoropolyether compound and a fluorine-substituted alkyl group-containing organosilane compound. Forming a first layer on the translucent member , and then forming a second layer on the first layer in contact with a raw material mainly composed of a reactive organosiloxane compound. A method for manufacturing an image reading apparatus. The first layer is formed by applying a raw material mainly composed of two components, a silicon-containing perfluoropolyether compound having a hydrolyzable group and a fluorine-substituted alkyl group-containing organosilane compound, onto the translucent member. The image forming apparatus according to claim 10, wherein the image forming apparatus is formed. On the translucent member, the first layer is prepared by heating a raw material mainly composed of two components of a hydrolyzable group-containing silicon-containing perfluoropolyether compound and a fluorine-substituted alkyl group-containing organosilane compound under reduced pressure. The method of manufacturing an image reading device according to claim 10, wherein the image reading device is formed by vapor deposition. In a method of manufacturing an image reading apparatus that reads an image while conveying a document via a light-transmitting member between the image reading unit and the document, the light-transmitting member is provided with an antifouling layer on a surface facing the document. The antifouling layer is coated with a raw material mainly composed of a silicon-containing perfluoropolyether compound having a hydrolyzable group, a reactive organosiloxane compound, and a fluorine-substituted alkyl group-containing organosilane compound. A method for manufacturing an image reading apparatus, characterized by comprising: A silicon-containing perfluoropolyether compound having a hydrolyzable group, a reactive organosiloxane compound, and a fluorine-substituted alkyl group-containing organosilane compound are mixed in advance and then applied onto the translucent member. A method for manufacturing the image reading apparatus according to claim 13.   An image reading apparatus manufacturing method for reading an image while conveying a document via a translucent member between an image reading unit and the document, wherein the translucent member has an antifouling layer on a surface facing the document The antifouling layer heats a raw material mainly composed of a silicon-containing perfluoropolyether compound having a hydrolyzable group, a reactive organosiloxane compound, and a fluorine-substituted alkyl group-containing organosilane compound. A method for producing an image reading apparatus, wherein the image reading apparatus is formed by vapor deposition on the translucent member under reduced pressure.   In a cleaning method for an image reading apparatus that reads an image while conveying the original through a translucent member between the image reading portion and the original, a silicon-containing perfluoropolyether compound having a hydrolyzable group and a reactive organosiloxane A cleaning method for an image reading apparatus, wherein the translucent member is wiped with a cleaning base material impregnated with a liquid component containing a compound, a fluorine-substituted alkyl group-containing organosilane compound, and a fluorosilicone compound.   In a cleaning method for a recording apparatus with an image reading apparatus having an image reading apparatus that reads an image while conveying the original through a translucent member between the image reading section and the original, a silicon-containing perfluoro having a hydrolyzable group The translucent member is wiped with a cleaning base material impregnated with a liquid component containing a polyether compound, a reactive organosiloxane compound, a fluorine-substituted alkyl group-containing organosilane compound, and a fluorosilicone compound. A method for cleaning an image reading device portion of a recording device with an image reading device.

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