Abstract: When a master cylinder pressure detected by way of a pressure sensor (74) attains a level not lower than a target pressure (P.sub.OK), normally-open on-off valves (62, 63) for by-passing proportioning control valves (57.sub.1, 57.sub.2) are opened. If the slip factor of rear wheels, calculated by way of a slip factor calculation section (121), is not lower than a predetermined value, the on-off valves (64, 66) are opened to allow the rear wheel cylinder pressure to escape to accumulators (65, 67). Thus, if there is enough room for the increase of the braking force on the rear wheels, the rear wheel braking force can be increased to reduce the share of the front wheel braking force, depending on braking conditions, such as the road surface conditions, vehicle running conditions, etc. Further the rear wheels can be prevented from being locked.

Abstract: A first target value is set as an initial value of split point pressure, a master cylinder pressure is set as a second target value of split point pressure in a memory when ABS valves (17, 20, and 23) are operated, thereafter when a sign of locking of the rear wheels is detected, the target value is reduced even further and set in the memory, the target value is maintained for a predetermined time by timer control at every setting of a new target value, and when a braking deceleration generated while the target value is maintained in the memory, a controller (37) controls so that the target value is increased after the completion of braking. When the master cylinder pressure is higher than the target value stored in the memory, proportioning valves (26 and 27) are closed to decrease a ratio of the rear wheel braking force to the front wheel braking force, thereby always achieving appropriate control over the rear wheel braking force allocation.

Abstract: A shape-memorizing block copolymer composition characterized by comprising a block copolymer component (I) composed of (A) at least two polymer segments (polymer segments A) having a glass transition temperature of 60.degree. C. to 250.degree. C. and (B) at least one amorphous polymer segment (polymer segment B) having a glass transition temperature which is not lower than -20.degree. C. but lower than the lowest glass transition temperature within those of said polymer segments A with a difference not less than 20.degree. C., the proportion of whole of said polymer segments A to whole of said polymer segment B being in the range of (10/90) to (70/30) by weight; and a rubbery polymer component (II) having a glass transition temperature lower than -20.degree. C., the proportion of said component (I) to said component (II) being in the range of (50/50) to (98/2) by weight.

Abstract: In an ultrathin piezoelectric resonator including an ultrathin vibratory portion and thick frame-like marginal portion formed integrally therewith for supporting it around, an electrode and an electrode lead pattern extending therefrom are provided on one surface of the vibratory portion and an electrode is provided on the other surface of the vibratory portion in an area except at least an area corresponding to the electrode lead pattern, thereby preventing that a capacitor is formed between the electrode and the electrode pattern deposited on the opposite surfaces of the vibratory portion and increases the parallel capacitance of the resonator. The electrode lead pattern is formed narrow to reduce an ohmic loss and suppress a spurious resonance. A through hole is made in the frame-like marginal portion and extends therethrough in its thickwise direction.

Abstract: In a resonator which has an ultrathin vibratory portion formed integrally with a thick frame-like rib surrounding it, a pair of opposed thick marginal portions of the frame-like rib are formed so that their widths gradually decreases toward another marginal portion of the rib from the other remaining one perpendicular to the above-noted pair of opposed marginal portions and to be fixed to a resonator case. This structure substantially increases the mechanical strength of the piezoelectric resonator, even if it is held in a cantilever fashion, and protects it from breakage by an external vibration or shock.

Abstract: In a piezoelectric resonator having an ultrathin vibratory portion formed by a cavity made in a piezoelectric block and a thick frame-like rib formed integrally with said vibratory portion and surrounding it, an excess adhesive receiving groove or the like is cut in one marginal portion of the frame-like rib between an adhesive coated region. The resonator is fixedly housed in a package by use of an adhesive coated on one marginal portion of the frame-like rib along the z-axis direction, or by means of elastic pawls without using the adhesive. In this case, one marginal portion of the frame-like rib on the opposite side from a pad deposited on one side of the piezoelectric resonator is bonded to the bottom of the package.

Abstract: A high frequency narrow-band pass multi-mode filter in constructed in such manner that SAW of SSBW resonators are closely disposed to each other on a single piezo-electric substrate to generate different vibration modes of different resonance frequencies, conditions that the resonators are acoustically coupled to each other to cause these vibration modes, are experimentally found, and the above conditions are satisfied by the filter.In order to reduce the ohmic loss of a very narrow common bus bar, the number of strip pairs of electrode in both interdigital transducers (hereinafter referred to as IDT) is minimized and instead reflectors are provided on the both sides of said TDTs to compensate for the reduction of its Q value. A part of the bus bar for the IDT electrodes is formed integral with some or all of gratings of the reflectors, whereby the connecting positions of the grating electrodes with respect to lead terminals can be positioned with a high freedom.

Abstract: A high frequency narrow-band pass multi-mode filter in constructed in such manner that SAW of SSBW resonators are closely disposed to each other on a single piezoelectric substrate to generate different vibration modes of different resonance frequencies, conditions that the resonators are acoustically coupled to each other to cause these vibration modes, are experimentally found, and the above conditions are satisfied by the filter.In order to reduce the ohmic loss of a very narrow common bus bar, the number of strip pairs of electrode in both interdigital transducers (hereinafter referred to as IDT) is minimized and instead reflectors are provided on the both sides TDTs to compensate for the reduction of its Q value. A part of the bus bar for the IDT electrodes is formed integral with some or all of gratings of the reflectors, whereby the connecting positions of the grating electrodes with respect to lead terminals can be positioned with a high freedom.