Abstract: A surface acoustic wave device configured by forming an oxide layer 2 on a piezoelectric substrate 1 composed of a lithium tantalate single crystal or a lithium niobate single crystal and having weak pyroelectric properties having a lower oxygen content than a stoichiometric composition ratio, and forming thereon an IDT electrode 3. There is no static destruction of a minute electrode due to the pyroelectric effect of the piezoelectric substrate having weak pyroelectric properties, and frequency characteristics are not degraded.

Abstract: A surface acoustic wave device configured by forming an oxide layer 2 on a piezoelectric substrate 1 composed of a lithium tantalate single crystal or a lithium niobate single crystal and having weak pyroelectric properties having a lower oxygen content than a stoichiometric composition ratio, and forming thereon an IDT electrode 3. There is no static destruction of a minute electrode due to the pyroelectric effect of the piezoelectric substrate having weak pyroelectric properties, and frequency characteristics are not degraded.

Abstract: A surface acoustic wave device configured by forming an oxide layer 2 on a piezoelectric substrate 1 composed of a lithium tantalate single crystal or a lithium niobate single crystal and having weak pyroelectric properties having a lower oxygen content than a stoichiometric composition ratio, and forming thereon an IDT electrode 3. There is no static destruction of a minute electrode due to the pyroelectric effect of the piezoelectric substrate having weak pyroelectric properties, and frequency characteristics are not degraded.

Abstract: A surface acoustic wave device configured by forming an oxide layer 2 on a piezoelectric substrate 1 composed of a lithium tantalate single crystal or a lithium niobate single crystal and having weak pyroelectric properties having a lower oxygen content than a stoichiometric composition ratio, and forming thereon an IDT electrode 3. There is no static destruction of a minute electrode due to the pyroelectric effect of the piezoelectric substrate having weak pyroelectric properties, and frequency characteristics are not degraded.

Abstract: A control unit 1 for an air bag is arranged between an inflater 2 for the air bag and a power source generating a current for operating the inflater. The control unit 2 includes a storage device 9 for storing information of whether the inflater 2 has been operated or not. A controller 13 is connected with the storage device 9 for supplying current for operating the inflater on the basis of operating information when the storage device 9 does not store the information that the inflater 2 has ever been operated. Warning device 4 is also connected with the storage device 9 for giving a warning when the storage device 9 stores information that the inflater has been previously operated. The storage device 9 stores the inflation information when the control unit 1 supplies current to the inflater 2 and operates it. The control unit 1 drives the warning device 4 if it detects the inflation information in the storage device 9 when setting the inflation.

Abstract: An electric connector comprised of a pin connector, socket connectors to be connected to the pin connector and a detection lever for detecting complete connection between the pin and socket connector. The detection lever has push rods operable on switch contacts arranged in the pin connector in electric connection to an indication circuit. When the detection lever is depressed under condition of complete connection, the push rods are allowed to open the switch contacts, i.e. the indication circuit which thereupon visually and/or audibly indicates presence of the complete connection.

Abstract: A perfect coupling confirming mechanism for an electric connector having a first connector housing and a second connector housing, employing two electrical contactors, among those accommodated in contactor chambers formed in the second connector housing, as check contactors for the confirmation of the perfect coupling of the first and second connector housings. The first connector housing is provided with a principal locking arm provided with a first and second locking projections. A locking slider and a short-circuiting member are provided movably in the second connector housing. When the first and second connector housings are coupled perfectly, the first locking projection and the second connector housing are engaged to lock the first and second connector housings to each other in a primary locked state.

Abstract: A coupling confirming mechanism for an electric connector having a first and second connector housings, capable of confirming the proper coupling of the first and second connector housings and double-locking the first and second connector housings. The coupling confirming mechanism comprises: a locking arm having a locking projection formed on the first connector housing; a locking lever pivotally joined at its rear end to the first connector housing and provided at its front end with an insulating projection, and at its front end with locking fingers; locking projections formed on the second connector housing; a break contact formed of a pair of short-circuiting terminals disposed in a short-circuiting terminal chamber formed in the second connector housing.

Abstract: A connector has a male connecting member and a female connecting member. A monitor element comprising a resistor and a switch which are connected in series is provided in the male connecting member. The switch is provided to be opened when the connector is in a completely connected state. A monitoring circuit including the monitor element having a pair of output terminals at ends of the circuit is provided for detecting voltage across the output terminal. A change of the voltage upon the disconnection of the connector is signaled.

Abstract: There is disclosed a power apparatus for diagnosing on air bag equipment, which includes a central processing unit (CPU) having a clock circuit and diagnoses errors and faults occurring in the air bag equipment in order to detect and store error postion, time and condition occurred. The power apparatus comprises a battery circuit for directly connecting a battery and the CPU in order to supply with power of the CPU, an ignition switch circuit for supplying the CPU with the power through an ignition switch, and a changeover control unit for changing a power line in the manner of supplying the CPU with the power through the ignition switch circuit when the engine starts for the first time after delivery, and for supplying the CPU with the power through the battery circuit after failure occurs.

Abstract: An electrical connector including a pin contact housing having a plurality of recesses and socket contact housings to be received in the corresponding recesses. The socket contact housing is provided with a resilient finger with an opening which can be engaged with a ridge projected from the inner wall of each of recesses. The pin contact housing is provided with a lock bar having first latch members which can be lowered down and engaged with the corresponding second latch members arranged to the socket contact housing when the socket contact housing is completely received in the recess in the pin contact housing to prevent separation of the pin contact housing and the socket contact housing.

Abstract: A pair of g-responsive first parallel sensors and a pair of g-responsive second parallel sensors provided in a motor vehicle. An inflator is mounted on a steering wheel of the vehicle and cruise operating switches are provided on the steering wheel. An air bag circuit is from a first source to a ground passing through the first parallel sensors, a pair of first parallel leads in a connector provided on the steering wheel, inflator, a pair of second parallel leads in the connector, and the second parallel sensors. A cruise operating circuit is from a second source to the ground passing through a lead in the connector, cruise switches, and the second parallel leads, so that the second parallel leads are common to the air bag circuit and the cruise operating circuit.

Abstract: A connector having a plug and a socket for receiving the plug. A first lock mechanism for locking the plug at a short inserting position, and a second lock mechanism for locking the plug at a long inserting position are provided. An indicator is provided for indicating a locked state by the second lock mechanism, thereby providing information that the plug is in an incomplete locking state.

Abstract: A motor vehicle collision sensing device for an air bag system comprises a fork-shaped support leaf made of a base portion and a pair of leg portions, and a roller mass rotatably supported by a rolled portion of the support leaf. When collision occurs, the roller mass is caused to roll on the support leaf because of the inertia, and an electric contact on the support leaf is brought into contact with a stationary electric contact disposed between the leg portions of the support leaf, whereby a collision sensing circuit is closed to energize a squib unit so that a safety air bag is instantaneously inflated. A breakdown detecting circuit is provided to detect breakdown of any part of the support leaf. The detecting circuit comprises first and second electric resistors connected to the leg portions, respectively, in parallel with each other.