Dai Nippon Printing Co., Ltd.

Dai Nippon Insatsu Kabushiki Kaisha

Shigehiko Tahara

Kenji Ueda

Akio Morii

Takehiko Anegawa

Satoshi Ikeda

Satoshi Yamazaki

Norio Takahashi

Akira Hayakawa

Satoshi Takeuchi

Ryuji Horiguchi

Shinichi Kurokawa

Shinpei Komaki

Morito Sakai

Yoshiharu Yui

Koutaro Danjo

The invention provides a hologram-recording subject plate comprising a block and a variety of subjects fixedly contained therein, which ensures easy, stable yet continuous recording of a multiplicity of identical holograms or different holograms reconstructible by illuminating light as is the case with a hologram-replicating method, a hologram-making method using the same, and a hologram-recorded article. The subject plate comprises a transparent solid block,and a hologram-recording subject S contained therein. A photosensitive material film,is applied directly onto one surface of the subject plate, and the subject plate is then irradiated with laser light,through the photosensitive material film,Such simple operation enables a multiplicity of identical holograms to be recorded in an easy, stable yet continuous manner.

Subject plate for recording holograms, hologram-making method, and hologram-recorded article

The invention provides a hologram-recording subject plate comprising a block and a variety of subjects fixedly contained therein, which ensures easy, stable yet continuous recording of a multiplicity of identical holograms or different holograms reconstructible by illuminating light as is the case with a hologram-replicating method, a hologram-making method using the same, and a hologram-recorded article. The subject plate comprises a transparent solid block 5 and a hologram-recording subject S contained therein. A photosensitive material film 1 is applied directly onto one surface of the subject plate, and the subject plate is then irradiated with laser light 7 through the photosensitive material film 1. Such simple operation enables a multiplicity of identical holograms to be recorded in an easy, stable yet continuous manner.

Recorded volume holograms with multiple adhesive layers

The invention is directed to an information-recorded medium with easily selectable and identifiable items of information, which is virtually protected against forgery and has enhanced security against some improper use, and a method for reading such a medium. This information-recorded medium 1 includes a substrate 2 and a layer 3 with information recorded thereon by the printing of infrared absorbing ink, said layer 3 being provided on the surface of the layer 2. The printed layer 3 is provided thereon with a relief hologram-recorded layer 7 through an adhesive layer 4, said hologram-recorded layer 7 being built up of a reflecting layer 5 transparent to the infrared region and a relief hologram-formed layer 6 provided on the surface of the reflecting layer 5. For reading, the hologram-recorded layer 7 is reconstructed by visible light, while the printed layer is reconstructed by infrared light, and the medium 1 is identified on the basis of the thus reconstructed information.

Information-recorded media and methods for reading the information

The invention provides a hologram-recording subject plate comprising a block and a variety of subjects fixedly contained therein, which ensures easy, stable yet continuous recording of a multiplicity of identical holograms or different holograms reconstructible by illuminating light, , a hologram-making method using the same, and a hologram-recorded article. The subject plate comprises a transparent solid block and a hologram-recording subject contained therein. A photosensitive material film is applied directly onto one surface of the subject plate, and the subject plate is then irradiated with laser light through the photosensitive material film. Such simple operation enables a multiplicity of identical holograms to be recorded in an easy, stable yet continuous manner.

Subject plate for recording holograms, holograms-making method, and

A method wherein a hologram is transferred from a transfer foil formed with a surface relief pattern and having a reflecting layer, and information, e.g., an image or a character, other than information originally recorded on the hologram is added to the transferred hologram. The method comprises preparing a transfer foil having a reflection relief hologram comprising a resin layer having a surface relief pattern, e.g., a relief hologram, a relief diffraction grating, etc., formed on the surface thereof, and a reflecting layer formed on the relief surface of the resin layer, transferring at least a part of the hologram to the surface of an object, and heating a part of the transferred portion with a heating device, thereby destroying the reflecting layer to record another information. Also disclosed are a method which enables a fine hologram pattern to be readily transferred to a large area, a transfer foil having a reflecting layer which enables a surface relief pattern to be transferred precisely with excellent foil breaking characteristics, and a method of producing a surface relief pattern transfer foil.

Transfer foil having reflecting layer with surface relief pattern

A hologram containing information recorded such a manner that it is difficult to read. A Lippmann hologram (10) contains photoelectrically readable information (13) recorded so as to be reconstructible only with a specific invisible wavelength (6) in the infrared or ultraviolet region. It is difficult to read the information recorded on the hologram unless information about the wavelength of diffracted light (14) for reconstruction is given. The hologram is also difficult to forge and hence suitable for security purposes.

Multiply recorded hologram for security

A method wherein a hologram is transferred from a transfer foil formed with a fine dimple pattern and having a reflecting layer, and information, e.g., an image or a character, other than information originally recorded on the hologram is added to the transferred hologram. The method comprises preparing a transfer foil having a reflection relief hologram comprising a resin layer having a fine dimple pattern, e.g., a relief hologram, a relief diffraction grating, etc., formed on the surface thereof, and a reflecting layer formed on the dimpled surface of the resin layer, transferring at least a part of the hologram to the surface of an object, and heating a part of the transferred portion with a heating device, thereby destroying the reflecting layer to record another information. Also disclosed are a method which enables a fine hologram pattern to be readily transferred to a large area, a transfer foil having a reflecting layer which enables a fine dimple pattern to be transferred precisely with excellent foil breaking characteristics, and a method of producing such a fine dimple pattern transfer foil.

Transfer foil having reflecting layer with fine dimple pattern recorded

A transparent-type hologram comprising a transparent hologram-forming layer and a holographic effect-enhancing layer comprising a thin transparent film, the holographic effect-enhancing layer being laminated on the hologram-forming portion of the transparent hologram-forming layer. The holographic effect-enhancing layer has a refractive index different from that of the transparent hologram-forming layer.

Growing community of inventors

Tokyo, Japan

Shigehiko Tahara