摘要:
A compound of ##STR1## (wherein n is an integer from 2 to 15; R' is ##STR2## m is total number of carbon atoms in R' and is an integer from 5 to 12, and * mark shows asymmetric carbon atom) which is useful for an electric indicative element of liquid crystal is provided.
摘要:
A disk cartridge (21) for loading on a flat tray (1) included in a disk loading apparatus. Recesses (29) are provided on the back side of the disk cartridge near the rear end (27a) thereof, and projections (16) are provided on the tray for judging whether the disk cartridge is loaded properly on the tray. In addition, notches (30) are formed on the right (27d) and left (27c) sides of the disk cartridge between the recesses and the rear end thereof for engagement with an automatic cartridge-changer.
摘要:
The novel liquid crystal compounds of the present invention are represented by the following formulas �I!-�II! and have tristable molecular orientation states and can be used for display devices and electrooptical devices. ##STR1## wherein R.sub.1 represents an alkyl group of 5-18 carbon atoms; R.sub.2 represents an alkyl group of 6-16 carbon atoms; R.sub.3 represents an alkyl group of 8-18 carbon atoms; R.sub.4 represents an alkyl group of 6-14 carbon atoms; Y represents ##STR2## and * indicates an optically active center.
摘要翻译:本发明的新型液晶化合物由下式[I] - [II]表示,具有三重分子取向状态,可用于显示装置和电光装置。 其中R 1表示5-18个碳原子的烷基; R 2表示6-16个碳原子的烷基; R3代表8-18个碳原子的烷基; R4代表6-14个碳原子的烷基; Y表示,*表示光学活动中心。
摘要:
A cartridge for housing a recording medium therein. The cartridge includes a cartridge body configured such that a signal recording apparatus can record a signal onto the recording medium when the cartridge is loaded in the signal recording apparatus. The cartridge also includes an opening in the cartridge body for removing the recording medium from the cartridge body, and a cover covering the opening. An indicator on the cartridge body indicates whether the cover has ever been opened or removed from the cartridge body.
摘要:
According to the present invention, a stepping motor driving apparatus having a rotor and a stator in n (an integer equal to or larger than 2) phases for moving a moving body is provided. The stepping motor driving apparatus includes a driver for selectively supplying to the stator a first current pattern for rotating the rotor at a first pitch and a second current pattern for rotating the rotor at a second pitch different from the first pitch based on a drive switching signal. The driver switches the first current pattern and the second current pattern at a point where a torque generated by the first current pattern is equal to a torque generated by the second current pattern and supplies the first current pattern or the second current pattern to the stator.
摘要:
Ferrelectric chiral smetic liquid crystal compound are provided which have the formula, for example ##STR1## wherein R is a C.sub.1-20 alkyl group.
摘要:
A liquid crystal compound represented by formula (I): ##STR1## wherein R.sub.1 represents an alkyl group having from 5 to 18 carbon atoms; R.sub.2 represents an alkyl group having from 4 to 15 carbon atoms; X represents a single bond, --O--, ##STR2## and * indicates an optically active center. The compound exhibits three stable states of molecular orientation.
摘要:
It is an object of the invention to present a recording and reproducing apparatus capable of mounting a bare disk and a cartridge selectively on a tray, without dropping from the tray in vertical position.To achieve the object, the invention comprises a turntable engaged with a disk for supporting the disk on a recording and reproducing position, a pickup for moving on the surface of the disk to record a signal in the disk or to reproduce a signal from the disk, and a flat tray for transferring between an engagement position with the turntable and a disk exchange position while holding the disk in a position so that its side may be at least in vertical position,wherein the tray possesses a first disk engaging portion freely movable in a tray transfer direction, being thrust in a disk exchange position direction of the tray, for detachably supporting the peripheral edge of the disk or one side of a cartridge, and a second disk engaging portion having a state of holding the peripheral edge of the disk together with the first disk engaging portion in a vertical position of the side of the disk, and a state of sinking into a holding surface, on the holding surface, and the holding surface possesses a cartridge mounting portion for detachably holding a cartridge incorporating a disk.
摘要:
A liquid crystal orientation controlling membrane, characterized by the polyimide membrane comprising the repeating unit represented by the formula: ##STR1## wherein Ar.sub.1 represents a diamine moiety which is selected from the group consisting of ##STR2## Ar.sub.2 represents tetravalent carboxylic acid moiety which is selected from the group consisting of ##STR3## Another invention is a ferroelectric liquid crystal element or an antiferroelectric liquid crystal element using the polyimide orientation controlling membrane mentioned above. The present liquid crystal element is used to a large picture display with high resolution, a TV picture display with wide viewing angle and a liquid crystal optical shutter.
摘要:
(R)- and (S)-enantiomer composition represented by the formula (I) having sufficient high optical purity for exhibiting optically tristable states in S*(3) phase; ##STR1## wherein Ra means a C.sub.5 -C.sub.14 alkyl group or a C.sub.5 -C.sub.14 alkoxy group, preferably a C.sub.5 -C.sub.14 alkyl group, Rb means a C.sub.4 -C.sub.12 normal alkyl group or a C.sub.4 -C.sub.12 branched alkyl group, X means a ##STR2## group or a ##STR3## group, Z means a fluorine containing alkyl group, preferably a trifluoromethyl group and * shows an optically active carbon.