Abstract: A tire pressure monitoring system includes an on-board detection unit configured to transmit a detection signal indicative of the presence of an occupant entering a vehicle, a vehicle-body-based unit configured to receive the detection signal and transmit a transmission request to receive at least one air pressure signal indicative of tire pressure of the vehicle, and at least one tire-based unit configured to receive the transmission request, measure the tire pressure and transmit the air pressure signal.

Abstract: A tire pressure monitoring system includes an on-board detection unit configured to transmit a detection signal indicative of the presence of an occupant entering a vehicle, a vehicle-body-based unit configured to receive the detection signal and transmit a transmission request to receive at least one air pressure signal indicative of tire pressure of the vehicle, and at least one tire-based unit configured to receive the transmission request, measure the tire pressure and transmit the air pressure signal.

Abstract: A pointer for measuring instruments includes a fixing portion mounted on a drive shaft of a drive and an indicating portion supported on the fixing portion and extending therefrom in a direction perpendicular to an axis of the drive shaft. The indicating portion includes an EL element having a light-emitting surface extending over a substantially entire length of the indicating portion in the direction perpendicular to the drive shaft axis, at the light-emitting surface light being substantially uniformly distributed at least in the direction perpendicular to the drive shaft axis; a light-transmitting protective body covering at least the light-emitting surface; and an indicating tube. The surface of the portion of the indicating tube confronting at least the above light-emitting surface is arcuated in a circumferential direction of the direction perpendicular to the drive shaft axis.

Abstract: A headup display apparatus consists of a projection optical system unit installed in the dashboard of a car and a reflection member on the windshield. The projection optical system unit contains an indicator and an off-axis reflective hologram which reflects display light of the indicator toward the windshield, which in turn reflects it toward the viewing point of a driver. As a result, the display is seen superimposed on the exterior view. When external light as from the sun enters the projection optical system unit traveling in a direction reverse to the path of the display light, the off-axis reflective hologram reflects the incident external light toward a direction different from that of the outgoing display light to minimize an abnormal illumination of the indicator surface which would otherwise render the display unrecognizable. Behind the hologram is installed a heat dissipating member that receives infrared rays that have transmitted the hologram in order to dissipate heat.

Abstract: A non-regular reflection type holographic mirror which can reduce, when mounted as a reflection plate on a windshield of a vehicle, the inclination of a display image visually discerned by reflection and a process of manufacturing the same. The holographic mirror comprises a hologram plate including a transparent support member and a photosensitive agent layer formed on the transparent support member and having interference fringes formed therein such that the hologram plate has a function of a concave mirror at a first portion of the hologram plate and another function of a convex mirror at a second portion of the hologram plate on opposite sides of a horizontal center line. A reflection type display apparatus for a vehicle employing a non-regular reflection type hologram or a regular reflection type hologram constituting a concave mirror as a hologram combiner wherein a virtual image of a display unit is reversed into an erect image and compensated for in contraction to improve the discernibility.

Abstract: Disclosure is a luminous pointer made of a light emission element of the inorganic substance dispersion type, high in accuracy of reading, and low in cost. The light emission element of the inorganic substance dispersion type is shaped as a rod, and includes a linear metal core, an electrically-insulating reflective layer made of an enamel and disposed on the core, a fluorescent light emission layer which is made of an enamel and a fluorescent substance dispersed therein and is disposed on the reflective layer, an electroconductive film disposed on the light emission layer and capable of being electrically connected to the core, and an outer electrically-insulating layer disposed on the film. The film has at least one slit which has a width smaller than the diameter of the luminous pointer and extends as a luminously visible portion in the longitudinal direction of the film. An intermediate electrically-insulating layer made of an enamel may be provided between the light emission layer and the film.

Abstract: To unvisualize the mechanical indicating instrument for an automotive vehicle when the ignition switch is turned off, the pointer is covered by a pointer cover below zero indication when the meter is deactivated, or a semitransparent front cover is disposed in front of the dial. In this case, the meter is offset by an offset magnet from a zero position to under the pointer cover when deactivated. On the other hand, to visualize the same instrument, when the ignition switch is turned on, lamps disposed in front and/or back of the dial are illuminated and a colored transparent pointer is illuminated by another or the same lamp in linkage with the ignition switch.

Abstract: A display system according to the present invention is provided with a projective display unit for projecting a display image of a display device which displays various data, onto a front glass of the vehicle and forming a virtual image of the display image in front of the front glass, and a position adjusting means for adjusting the position of the virtual image formed in front of the front glass by shifting a projective optical axis of the display image extending to the front glass, whereby the whole surface of the front glass in front of the driver can be utilized as a display image projection surface and hence the virtual image of the display image can be formed in a desired position aligned with the line of vision of the driver without obstructing the front sight of the driver.