The present invention provides a vibration generator capable of accurately adapting to fine vibration. The vibration generator has a stationary permanent magnet, a yoke for the permanent magnet, a coil fixed to the yoke, four springs provided to the yoke, and a movable piece supported with the yoke through the four springs. The end portions of the movable piece are arranged between the respective two pairs of the projections with first gaps. The central portion of the movable piece is arranged in the through-hole with the second gaps, the second gaps having a size to allow oscillation, which is regulated by the first gaps, of the central portion of the movable piece.

The present invention provides a vibration generator capable of accurately adapting to fine vibration. The vibration generator has a stationary permanent magnet, a yoke for the permanent magnet, a coil fixed to the yoke, four springs provided to the yoke, and a movable piece supported with the yoke through the four springs. The end portions of the movable piece are arranged between the respective two pairs of the projections with first gaps. The central portion of the movable piece is arranged in the through-hole with the second gaps, the second gaps having a size to allow oscillation, which is regulated by the first gaps, of the central portion of the movable piece.

An apparatus for preparing a relief plate precursor, such as a printing plate precursor, that has to be treated. The apparatus includes a transport bar provided with at least one penetration element, preferably a plurality of penetration elements; and a plate coupling station configured for coupling a relief plate precursor to the transport bar by causing a penetration by the at least one penetration element through an unperforated area near an edge of a relief plate precursor.

An apparatus for preparing a relief plate precursor, such as a printing plate precursor, that has to be treated. The apparatus includes a transport bar provided with at least one penetration element, preferably a plurality of penetration elements; and a plate coupling station configured for coupling a relief plate precursor to the transport bar by causing a penetration by the at least one penetration element through an unperforated area near an edge of a relief plate precursor.

A printing intaglio (100A), (100B) is a printing intaglio for use in intaglio printing, the printing intaglio having a surface which has a plurality of first recessed portions (12) that form a pattern to be printed, wherein at least one of the plurality of first recessed portions has a plurality of minute recessed portions (16p) inside the first recessed portion, and when viewed in a direction normal to the surface of the printing intaglio, a two-dimensional size of the plurality of minute recessed portions is not less than 10 nm and less than 500 nm.

The invention relates to a method (100) for producing an image structure (12) according to an image specification (20), in particular for a letterpress process and/or intaglio printing process, characterized in that the following steps are carried out: a) providing a base (10) for receiving the image structure (12), b) producing an image structure (12) on the base (10) so that an image layer (11) is formed on the base (10) by means of the image structure (12).

The invention relates to a method (100) for producing an image structure (12) according to an image specification (20), in particular for a letterpress process and/or intaglio printing process, characterized in that the following steps are carried out: a) providing a base (10) for receiving the image structure (12), b) producing an image structure (12) on the base (10) so that an image layer (11) is formed on the base (10) by means of the image structure (12).

The present invention relates to a process for making an etched pattern comprising a step of depositing onto a printable metal surface droplets of an ink composition provided by a printing method, wherein the ink composition comprises a first ink vehicle being water, a second ink vehicle being an organic compound and an etchant being an acid or abase according to the Brnsted definition, characterized in that the ink composition has a pH in the range of from (0) to (4) or from (9) to (14). The invention further relates to substrates having a metal surface with an etched pattern, to the use of such substrates in various applications, to articles comprising the inventive substrate and to the use of the inventive process for the production of metal products.

The present invention provides a photosensitive resin composition for a relief printing original plate which can achieve both of a printing reproducibility of gradation of a highlight part and a printing durability, and can further achieve a low plate surface tackiness. A photosensitive resin composition for a relief printing original plate containing water-soluble or water-dispersible polyamide, a photopolymerizable unsaturated compound and a photopolymerization initiator as essential ingredients, characterized in that a total of a content of an alicyclic structural unit obtained from diamine and a content of an alicyclic structural unit obtained from dicarboxylic acid in the polyamide is 30 to 90 molar %, and the content of the alicyclic structural unit obtained from dicarboxylic acid in the polyamide is 20 molar % or more.

The present invention provides a photosensitive resin composition for a relief printing original plate which can achieve both of a printing reproducibility of gradation of a highlight part and a printing durability, and can further achieve a low plate surface tackiness. A photosensitive resin composition for a relief printing original plate containing water-soluble or water-dispersible polyamide, a photopolymerizable unsaturated compound and a photopolymerization initiator as essential ingredients, characterized in that a total of a content of an alicyclic structural unit obtained from diamine and a content of an alicyclic structural unit obtained from dicarboxylic acid in the polyamide is 30 to 90 molar %, and the content of the alicyclic structural unit obtained from dicarboxylic acid in the polyamide is 20 molar % or more.