摘要:
Disclosed is a process for the preparation of a 5-hydroxy-3-ketoester derivative of the formula: ##STR1## in which R.sup.1 represents an alkyl group, an alkenyl group, an alkynyl group, an aryl group or a heterocyclic group, and R.sup.2 represents an alkyl group or an aryl group, which comprises causing the reaction of an aldehyde compound of the formula R.sup.1 CHO in which R.sup.1 has the meanings as defined above and diketene in the presence of a metal compound selected from a titanium or aluminum compound having at least one group of --OR.sup.3 in which R.sup.3 represents an alkyl group or an aryl group. Further, a process for the preparation of an optically active substance of the 5-hydroxy-3-ketoester derivative causing the reaction of the above compounds in the presence of the metal compound and optically active Schiff base or a complex compound obtained by reacting the metal compound with the optically active Schiff base, also is disclosed.
摘要:
A parking lock device is mounted on a transmission of a vehicle. The transmission includes a housing and an output shaft. The park lock device includes a parking pawl including a pawl portion, a first coupling member coupled to a rear end portion of the output shaft of the transmission, and a second coupling member coupled directly to the first coupling member, the second coupling member being supported by the housing of the transmission through a bearing and being provided with an extended shaft portion formed in a same shape as the rear end portion of the output shaft of the transmission, and a coupling coupled to the extended shaft portion of the second coupling member.
摘要:
A light guide plate for liquid crystal display, made of a resin, which has a surface layer portion (preferably on the light incident surface side of the light guide plate) comprising a region containing fluorine atoms in an amount larger than that in the inner layer portion. The resin is preferably an alicyclic structure-containing resin. The light guide plate is produced by exposing a surface of a light guide plate substrate to an atmosphere containing fluorine gas. Preferably, prior to the exposure to a fluorine-gas containing atmosphere and after the exposure to a fluorine-gas containing atmosphere, the light guide plate substrate is maintained in an inert gas-containing atmosphere, or in the air under reduced pressure, for the production of the light guide plate.
摘要:
The present invention is to provide an optical element in which both a good light diffusion performance and a good light transmittance are achieved and which is less subject to environmental influence, a method for production thereof and a display device using the optical element. An optical element including a molded body containing a resin having an alicyclic structure, wherein a fine hologram surface diffusion pattern has been precisely formed is provided. It is preferable that the optical element is a light diffusion plate or a light diffusion sheet. Further, it is preferable that the optical element is a molded body made by injection-molding.
摘要:
A shift actuator for transmission, for turning, in a direction of shift, a shift lever support mechanism mounting the shift lever of the transmission. An operation lever is coupled, at an intermediate portion thereof, to the shift lever support mechanism. A first electromagnetic solenoid and a second electromagnetic solenoid are coupled to the two ends of the operation level so as to operate in upward and downward directions. The operation rod of the first electromagnetic solenoid is coupled to one end of the operation lever, and the operation rod of the second electromagnetic solenoid is coupled to the other end of the operation lever.
摘要:
The present invention provide an establishment for viewing an image that the Spectators can see the image projected on the sceen from the seat while they move so that the spectators can experience a big change for visual sense, various visual experience as well as a non-daily-physical sense.
摘要:
A vehicle equipped with a system (30) for automatically disengaging and engaging a friction clutch (13) coupling between an engine (11) and a transmission (16). The vehicle is also equipped with an automatic brake system (34) for automatically applying and releasing a brake to and from wheels (43). The automatic clutch disengagement/engagement system (30) performs high speed clutch engagement at the time of restarting the vehicle. The automatic brake system (34) releases the brake upon completion of the quick clutch engagement. The quick clutch engagement occurs in a clutch play range. The amount of quick clutch engagement is determined by depression of an accelerator pedal (10). Since the accelerator depression varies from when the vehicle is started on a flat road to when on an inclination, an optimum brake releasing is effected regardless of the road inclination if the timing of brake release is determined in this manner.
摘要:
The present invention relates to a floatable aircraft such as a parachute balloon. The parachute balloon is comprised an envelope which is able to be collapsed and stored during periods of nonuse. A parachute is attached to the envelope, enabling the parachute balloon to fall safely by the effect of the parachute in various circumstances including the usual descent or an emergency during a fall, such as when out of fuel.
摘要:
An automatic clutch unit for vehicle use includes a slave cylinder to engage and disengage a friction clutch, an automatically operated hydraulic fluid feed mechanism to be operated by a pump, selectively connected with the slave cylinder, a manually operated hydraulic fluid feed mechanism to be operated by the action of a clutch pedal, selectively connected with the slave cylinder and a change-over cylinder having a piston pushed to one side of the cylinder by a spring, arranged among a hydraulic fluid pipeline of the manually operated hydraulic fluid feed mechanism, a hydraulic fluid pipeline of the automatically operated hydraulic fluid feed mechanism and a hydraulic fluid pipeline of the slave cylinder, wherein the piston side of the cylinder is connected with the hydraulic fluid pipeline of the manually operated hydraulic fluid feed mechanism, and the spring side of the cylinder is connected with the hydraulic fluid pipelines of the automatically operated hydraulic fluid feed mechanism and the slave cylinder, and hydraulic pressure generated by depressing the clutch pedal is transmitted to the slave cylinder when the piston of the change-over cylinder is moved.
摘要:
A lengthy grid polarizer film comprising a lengthy resin film and a plurality of grid lines provided on the surface and/or inside of the resin film and extending substantially in parallel with each other are provided, the grid lines being made of a material G being 1.0 or more in the absolute value of the difference between the real part n1 and the imaginary part κ1 of the complex refractive index (N1=n1−iκ1), said resin film having a plurality of rows of grooves formed extending substantially in parallel with each other on its surface, and said grid line being made of a thin film of the laminated material G on the bottom face of the grooves and/or on the top face of ridges located between the adjacent grooves. A lengthy optical laminated body comprises the lengthy grid polarizer film and another lengthy polarizing optical film.