摘要:
A hologram recording medium includes a glass substrate and an information recording layer supported on the glass substrate. The information recording layer is formed of a photosensitive material having a dynamic storage elastic modulus of 1.0×105 Pa or more as measured at 80° C. and a measurement frequency of 1 Hz after interference exposure or post-curing. The photosensitive material is dissolvable or dispersible in an organic solvent, and the information recording layer has sufficient storage stability that allows recorded signals to be stably held for at least 100 hours or longer at 80° C.
摘要:
An optical recording medium includes a support substrate and an information recording layer which is supported on the support substrate and made of a photosensitive material which is irradiated with light to be refractive index modulated and amplitude modulated, thereby recording information. The information recording layer has the shape of a coating which is formed by applying a photosensitive material reversibly dissolved or dispersed in an organic solvent onto the support substrate. The photosensitive material in the shape of a coating, as a photopolymer for hologram recording material, contains the cross-linked matrix to maintain the rigidity of the recording material. The optical recording medium is retained in shape with stability, and particularly prevented from being deformed due to shrinkage, thereby facilitating manufacturing of the optical recording medium.
摘要:
The present invention provides a process for producing a titanium-containing metal oxide the coloration of which is decreased; a hologram recording material suitable for holographic memory recording using a blue laser, wherein a titanium-containing metal oxide the coloration of which is decreased is used as a metal oxide matrix; a process for producing the same; and a hologram recording medium. A process for producing a metal oxide comprising at least Ti as a metal element, the process comprising: providing an alkoxide compound of Ti to which a glycol other than any geminal diol and any vicinal diol is coordinated; hydrolyzing the alkoxide compound of Ti to which the glycol is coordinated, thereby yielding a precursor of a metal oxide; and advancing polycondensation reaction of the metal oxide precursor, thereby forming the metal oxide.
摘要:
The present invention provides a hologram recording material which is suitable for volume hologram record and attains high refractive index change, flexibility, high sensitivity, low scattering, environment resistance, durability, low shrinkage and high multiplicity in holographic memory record using not only a green laser but also a blue laser; a process for producing the same; and a hologram recording medium having the hologram recording material. A hologram recording material comprising: a metal oxide containing at least Si and Zr as metals wherein a β-dicarbonyl compound is coordinated to Zr; and a photopolymerizable compound, wherein a mole ratio of the β-dicarbonyl compound to the Zr atom (β-dicarbonyl compound/Zr ratio) is 2/1 or more and 3/1 or less, and a mole ratio of the Si atom to the Zr atom (Si/Zr ratio) is more than 1/1 and 1.15/1 or less in the metal oxide. A hologram recording medium (11) comprising the hologram recording material layer (21).
摘要:
The present invention provides a method for producing a homogeneous complex oxide sol comprising Si and a metal other than Si as metal elements, and a method for producing a Si-containing hologram recording material using a homogeneous complex oxide sol. A method for producing a complex oxide sol comprising Si and a metal other than Si as metal elements, the method comprising: mixing a silanol compound with an alkoxide compound of a metal other than Si so that the silanol compound is reacted with the alkoxide compound, thereby yielding a precursor of a complex oxide, and adding water to the complex oxide precursor so as to hydrolyze an alkoxyl group bonded to the metal other than Si, and then making the resulting hydrolysate undergo a condensation reaction, thereby forming a complex oxide. A hologram recording medium (11) having a hologram recording layer (21) comprising the hologram recording material obtained by the production method.
摘要:
An optical recording medium includes a recording and reading layer that is previously staked or formed afterword and has no concavo-convex pattern for tracking control, and a servo layer in which a concavo-convex pattern or a groove for tracking control is formed. Information can be recorded in the recording and reading layer while tracking is performed using the servo layer.
摘要:
An object of the present invention is to increase the number of stacked layers in a multilayer optical recording medium while simplifying the design of the multilayer optical recording medium.Provided is a multilayer optical recording medium 10 including at least four recording and reading layers from which information can be reproduced by light irradiation, the layers stacked through intermediate layers. The multilayer optical recording medium 10 includes the plurality of recording and reading layers that are continuous in order of stacking and includes at least one recording and reading layer group in which reflectance in a stacked state decreases from a near side of a light incident surface to a far side. A single-layer reflectance of the nearest recording and reading layer is set to 0.2% or more and less than 2.0%, and a light transmittance improvement process is applied to the light incident surface.
摘要:
The multilayer optical recording medium with at least four or more recording and reading layers disposed one above the other has at least two or more recording and reading layer groups each including the recording and reading layers successively disposed one above the other. In adjacent recording and reading layer groups with an intermediate layer interposed therebetween, a recording and reading layer nearest a front side in the recording and reading layer group nearer a back side is higher than the higher value of the reflectances in a stacked state of two recording and reading layers nearest the back side in the recording and reading layer group nearer the front side.
摘要:
In a multilayer optical recording medium, it is an object to suppress generation of crosstalk while reducing an interlayer distance of recording and reading layers. In an optical recording medium including three or more recording and reading layers, a first distance, and a second distance greater than the first distance by 3 μm or more are alternately defined as interlayer distances of recording and reading layers.