Abstract: The rear projection screen of the present invention has a lenticular lens sheet 1. In the input surface of the lenticular lens sheet 1, a first lens array 12 is formed on a first lens layer 14. In the boundary between the first lens layer 14 and a second lens layer 15, a second lens array 13 substantially orthogonal to the first lens array 12 is formed. The second lens layer 15 has a different refractive index from the first lens layer 14. A lattice-shaped or stripe-shaped self-aligned ambient light absorbing layer 17 is formed in a light non-passing position on the second lens layer 15.

Abstract: A shaft part is coaxially provided within a pressure release port provided in a sealing plate sealed to an opening portion of a case for a condenser or a battery, a valve body closely fitted and fixed within the pressure release port has a seal lip which is directed toward the outside of a pressure container and is closely contacted with an outer peripheral surface of the shaft part with predetermined tensional force, and in the case that internal pressure of the case is increased more than a predetermined value, the seal lip is operated so as to open the valve, thereby releasing the internal pressure to the atmospheric air.

Abstract: The throttle position corresponding to the rotational angle of the throttle valve is calculated based on electric signals output from a rotor position detector constituted by three Hall ICs that detect the rotational position of a magnet rotor of a brushless DC motor. A valve position control quantity of the throttle valve is so calculated as to eliminate the difference between the thus calculated valve position and a target valve position. The motor current control quantity of the brushless DC motor is so determined as to eliminate the difference between the calculated valve position and the target valve position. Though the throttle position sensor is omitted, the electric signals output from the rotor position detector are used for calculating both the valve position control quantity and the motor current control quantity.

Abstract: A shaft part (20) is coaxially provided within a pressure release port (10) provided in a sealing plate (3) sealed to an opening portion of a case for a condenser or a battery, a valve body (30) closely fitted and fixed within the pressure release port (10) has a seal lip (33) which is directed toward the outside of a pressure container and is closely contacted with an outer peripheral surface of the shaft part (20) with predetermined tensional force, and in the case that internal pressure of the case is increased more than a predetermined value, the seal lip (33) is operated so as to open the valve, thereby releasing the internal pressure to the atmospheric air.

Abstract: A unitized oil seal (10) includes a wear sleeve element (12) and a seal element (14). The wear sleeve element (12) is configured to include an axially outwardly and radially inwardly tapered dust sealing surface (38). The seal element (14) is provided with a dust sealing lip (82) sealingly engaging the dust sealing surface (38). The dust sealing lip (82) is configured to flare out axially outwardly and radially outwardly so that the point of contact thereof with the dust sealing surface (38) is offset axially outwardly from the plane of an abutment surface (40) of the wear sleeve element. A high degree of dirt exclusion capability is achieved. The seal element (14) includes primary and auxiliary seal lips (74, 76) which are brought into sealing engagement with the wear sleeve without a conventional garter spring.