Abstract: The invention provides a casing for a storage apparatus having a first receiving portion for receiving a disc drive box in which a plurality of disc drives are received in a line, the first receiving portion being approximately equal in height and width to the disc drive box, and a second receiving portion for receiving a control portion box in which a plurality of control boards for executing a control relating to a data input and output process with respect to the disc drive are received in a line, the second receiving portion being approximately equal in height and width to the first receiving portion.

Abstract: A plurality of control packages 100 are mounted on both sides of a basic chassis 11 of a disk array device. A cable clamping mechanism 300 is disposed on the underside of the control packages 100 positioned in the space between the control packages 100 and a power unit 400. A rail portion 310 is disposed parallel to the direction in which the control packages 100 are arranged. A number of clamp cores 320 corresponding to the number of the control packages (CHA) are movably disposed on the rail portion 310. Each clamp core 320 corresponds to each of the control package 100, and clamps cables in control package units. Even when tensile force acts on the cables 200 from below, the present invention prevents this force from acting directly on a control package 100.

Abstract: Provided are a disk array device capable of reducing the manufacture load and management load of a logical board, and a disk array device capable of performing efficient cooling. Specifically, the former disk array device has a number of second logical boards constituted by functionally dividing in plural a first logical board having formed thereon a circuit for controlling the input and output of data; and a case for housing each of the second logical boards. This case houses each of the second logical boards so as to be arranged in a direction perpendicular to the insertion direction of the second logical boards into the case and the thickness direction of the second logical boards. The latter disk array device has a case for housing each of the logical boards so as to be arranged in the thickness direction of the logical board, and first and second cooling fans disposed respectively at the back end and front end of the case.

Abstract: The invention provides a casing for a storage apparatus having a first receiving portion for receiving a disc drive box in which a plurality of disc drives are received in a line, the first receiving portion being approximately equal in height and width to the disc drive box, and a second receiving portion for receiving a control portion box in which a plurality of control boards for executing a control relating to a data input and output process with respect to the disc drive are received in a line, the second receiving portion being approximately equal in height and width to the first receiving portion.

Abstract: A plurality of control packages 100 are mounted on both sides of a basic chassis 11 of a disk array device. A cable clamping mechanism 300 is disposed on the underside of the control packages 100 positioned in the space between the control packages 100 and a power unit 400. A rail portion 310 is disposed parallel to the direction in which the control packages 100 are arranged. A number of clamp cores 320 corresponding to the number of the control packages (CHA) are movably disposed on the rail portion 310. Each clamp core 320 corresponds to each of the control package 100, and clamps cables in control package units. Even when tensile force acts on the cables 200 from below, the present invention prevents this force from acting directly on a control package 100.

Abstract: A cooling structure for electronic devices includes a plurality of electronic device accommodating boxes, in which electronic devices are accommodated, disposed in a casing in multiple stages. A vent portion which allows ventilation between the inside and the outside of the casing is formed in a ceiling of the casing. In a first accommodating portion for accommodating the first electronic device accommodating box which is defined at the stage close to the ceiling, a hollow duct having two opening faces is arranged. The first opening face faces the vent portion and the second opening face faces a second accommodating portion for accommodating the second electronic device accommodating box which is defined at the stage remote from the ceiling. Air inside the second electronic device accommodating box is discharged through the inside of the duct. Air inside of the first electronic device accommodating box is discharged from the vent portion.

Abstract: A disk array apparatus facilitating the management of dummy boards which are dismounted when logic boards are additionally installed, for example. A storage section for storing dummy boards, which are removed when logic boards are additionally installed, is provided in the disk array casing. The storage section is provided in a place where the dummy boards do not adversely affect the passages of the flow of cooling air in the disk array casing and the work of mounting or dismounting the component parts on the rear side of a platter cover for shielding the logic section where logic boards are accommodated, for example, and the dummy boards are fixed to the storage section with screws.

Abstract: A storage apparatus includes a first rack having electrical conductivity, on which are mounted channel control parts receiving data input/output requests, and disk control parts performing read/write of data from and to disk drives, a second rack having electrical conductivity, on which are mounted disk drives, and relay parts for relaying communications between the disk drives and disk control parts; and communication cables for connecting disk control parts to relay parts. The communication cables include a transmission medium through which to transmit data, a first conductor having electrical conductivity and surrounding the transmission medium, a second conductor having electrical conductivity and surrounding the first conductor, and a covering surrounding the second conductor. The first conductor is connected to ground potential supply circuits provided in at least either disk control parts or relay parts, and the second conductor is connected to at least one of the first and second racks.

Abstract: A disk array apparatus facilitating the management of dummy boards which are dismounted when logic boards are additionally installed, for example. A storage section for storing dummy boards, which are removed when logic boards are additionally installed, is provided in the disk array casing. The storage section is provided in a place where the dummy boards do not adversely affect the passages of the flow of cooling air in the disk array casing and the work of mounting or dismounting the component parts on the rear side of a platter cover for shielding the logic section where logic boards are accommodated, for example, and the dummy boards are fixed to the storage section with screws.

Abstract: A plurality of control packages 100 are mounted on both sides of a basic chassis 11 of a disk array device. A cable clamping mechanism 300 is disposed on the underside of the control packages 100 positioned in the space between the control packages 100 and a power unit 400. A rail portion 310 is disposed parallel to the direction in which the control packages 100 are arranged. A number of clamp cores 320 corresponding to the number of the control packages (CHA) are movably disposed on the rail portion 310. Each clamp core 320 corresponds to each of the control package 100, and clamps cables in control package units. Even when tensile force acts on the cables 200 from below, the present invention prevents this force from acting directly on a control package 100.

Abstract: A storage apparatus includes a first rack having electrical conductivity, on which are mounted channel control parts receiving data input/output requests, and disk control parts performing read/write of data from and to disk drives, a second rack having electrical conductivity, on which are mounted disk drives and relay parts for relaying communications between the disk drives and disk control parts, and communication cables for connecting disk control parts to relay parts. The communication cables include a transmission medium through which to transmit data, a first conductor having electrical conductivity and surrounding the transmission medium, a second conductor having electrical conductivity and surrounding the first conductor, and a covering surrounding the second conductor. The first conductor is connected to ground potential supply circuits provided in at least either disk control parts or relay parts, and the second conductor is connected to at least one of the first and second racks.

Abstract: The present invention discloses a cooling structure for electronic devices which is characterized in that a plurality of electronic device accommodating boxes in which electronic devices are accommodated are accommodated in a casing in multiple stages, a vent portion which allows ventilation between the inside and the outside of the casing is formed in a ceiling of the casing, in a first accommodating portion for accommodating the first electronic device accommodating box which is defined at the stage close to the ceiling, a hollow duct having two opening faces is arranged, the first opening face faces the vent portion and the second opening face faces a second accommodating portion for accommodating the second electronic device accommodating box which is defined at the stage remote from the ceiling, air inside the second electronic device accommodating box which is accommodated in the second accommodating portion is discharged outside the casing from the vent portion through the inside of the duct, and air i

Abstract: The invention provides a casing for a storage apparatus having a first receiving portion for receiving a disc drive box in which a plurality of disc drives are received in a line, the first receiving portion being approximately equal in height and width to the disc drive box, and a second receiving portion for receiving a control portion box in which a plurality of control boards for executing a control relating to a data input and output process with respect to the disc drive are received in a line, the second receiving portion being approximately equal in height and width to the first receiving portion.

Abstract: The liquid crystal composition of the invention contains at least two compounds represented by the following formula (A) and each having different structures, one or more methylene group in the alkylene group R1 may be substituted with —O— groups, not less than 50% by weight, and has a transmitted light quantity I32 satisfying the condition of 0.5≦I32≦0.50, wherein R1 is an alkyl group of 2 to 20 carbon atoms; m is 0 or 1; Z is a —COO— group or a —CH2O— group; X is a hydrogen atom, a methyl group or a trifluoromethyl group; and R2 is a group selected from the group consisting of a straight-chain alkyl group of 1 to 5 carbon atoms, an ether group represented by —(CH2)p—O—(CH2)qCH3 and an alkene group wherein a terminal ethyl group consisting a straight-chain alkyl group of 2 to 5 carbon atoms is replaced with a group having a C═C double bond.

Abstract: The first smectic liquid crystal composition of the invention has a voltage gradation parameter L of less than 0.6, said parameter being defined by the equation L=S.sub.H /S.sub.O with the proviso that: a liquid crystal cell filled with a liquid crystal composition is placed between a pair of polarizing plates arranged in the crossed Nicols state; a voltage is applied to the liquid crystal cell to form a hysteresis curve showing a correlation between the voltage and a transmittance; and a tangent line I.sub.R of the hysteresis curve within a region wherein the transmittance steeply increases intersects a tangent line I.sub.F of the hysteresis curve within a region which is adjacent to the voltage-steep increase region and which is on the higher-voltage side at an intersection point P. In the above equation, S.sub.

Abstract: There is provided a carboxylic acid compound represented by the following formulae (I) to (IV): ##STR1## a liquid crystal material consisting of the carboxylic acid ester compound, a liquid crystal composition comprising the carboxylic acid ester compound, and a liquid crystal element using the carboxylic acid ester compound. There can be obtained advantages such as low operating temperature, high speed switching, very small electric power consumption, and high-stable contrast.

Abstract: There is provided a carboxylic acid compound represented by the following formulae (I) to (IV): ##STR1## a liquid crystal material consisting of the carboxylic acid ester compound, a liquid crystal composition comprising the carboxylic acid ester compound, and a liquid crystal element using the carboxylic acid ester compound. There can be obtained advantages such as low operating temperature, high speed switching, very small electric power consumption, and high-stable contrast.

Abstract: Disclosed is a liquid crystal material represented by the following formula [I]:R--X--A.sup.1 --Y.sup.1 --A.sup.2 --(Y.sup.2 --A.sup.3).sub.n --Z--R*[I]wherein R is an alkyl or polyfluoroalkyl group; X is a group such as --COO--, or a single bond; n is 0 or 1; A.sup.1, A.sup.2 and A.sup.3 are each a cyclic group such as tetralin, and at least one of them has an optically active group; Y.sup.1 and Y.sup.2 are each a group such as --COO--; Z is a group such as --O--, or a single bond; and R* is an optically active group. Also disclosed are a liquid crystal composition comprising the liquid crystal material represented by the above formula, and a liquid crystal element in which the liquid crystal material is used. The liquid crystal material of the invention shows excellent liquid crystal characteristics because it has at least two optically active groups.

Abstract: An antiferroelectric liquid crystal composite material comprising an organic polymer and an antiferroelectric liquid crystal material, both being in the dispersed state; a process for preparing a liquid crystal element including a step of mixing an organic polymer and an antiferroelectric liquid crystal material; and a liquid crystal element having such a structure that the above-mentioned antiferroelectric liquid crystal composite material is sandwiched between a pair of electrodes are provided. According to the present invention, there can be obtained a liquid crystal element which is available at a low price, quick in the electrooptical response, free from occurrence of switching failure and is able to make a large display screen.