Abstract:
In display devices based on ferroelectric liquid-crystal material with deformable helix, ferroelectric liquid-crystal material with a twisted smectic structure, monostable ferroelectric liquid-crystal material, electroclinic smectic A liquid-crystal material and anti-ferroelectric liquid-crystal material, the memory effect, particularly in the case of video applications, is eliminated by presenting reset pulses in successive row selection times during a part of these times (for example in the case of matrix displays based on TFTs), so that the polarization within a cell is always reduced to zero and, after selection for the purpose of writing data, switches to the proper value.
Abstract:
An apparatus for medical diagnosis and/or therapy which includes an electromagnetic proximity sensor (20-1, 20-2, 20-3, 20-4) which detects the presence of an object (for example, 28) directly in front of the sensor. By coupling the main drive directions (34-1, 34-2, 34-3) and (34-4) to the proximity sensors in such a manner that each main drive direction (for example, 34-4) substantially halves the exterior angle ( alpha 4) between the two neighbouring proximity sensors (20-1, 20-4) and by inhibiting the displacement in the associated main drive direction (34-4) by these two neighbouring proximity sensors, it is achieved that all clearing movements remain possible and all movements leading to collisions are inhibited.
Abstract:
The invention relates to an optoelectronic device with a module (1) comprising a holder (2) with an amplifier (3) and on either side thereof a lens (8) and a glass fiber (10) which can be aligned relative to the amplifier (3). The module (1) also comprises two monitor diodes (21). A disadvantage of the known device is that the lenses (8) cannot be easily aligned relative to the amplifier (3), and the monitor diodes (21) cannot be easily connected electrically. The use of aspherical lenses (8) also poses a problem. In a device according to the invention, the monitor diodes (21) are so positioned that they are capable of detecting radiation reflected at the outside of the lenses (8) instead of radiation refracted and reflected within the lenses (8), while the radiation-sensitive surfaces (22) of the monitor diodes (21) are positioned such that they receive more radiation from one lens (8) than from the other lens (8). This renders it possible to place the monitor diodes (21) on a separate, further holder (23) at some distance away from the amplifier (3) and the lenses (8), each being aimed at one of the two lenses (8). This facilitates both the alignment of the lenses (8) relative to the amplifier (3) and the electrical connection of the monitor diodes (21). The lenses (8), which now no longer bear on the monitor diodes (21) are also allowed to be aspherical now. Both the operation of the amplifier (3) and the value of the output signal can be monitored very well in this manner. The further holder (23) preferably has a T-shape with a wedge end (24) on which the monitor diodes (21) are present and which is immediately above the amplifier (3). The device according to the invention can be very compact. The angle ( alpha ) of the wedge portion (24) preferably lies between 45 and 90 DEG .
Abstract:
The luminaire for tubular lamps has a housing (1) having a light emission plane (2) and several lighting units (10) accommodated in the housing. Each unit (10) has a pair of opposed side reflectors (12), which are possibly connected to lamellae (15) and which bound the light emission window (11) of the unit. Between two adjacent units (10) a possibly light transmitting, e.g. perforated, plate (20) is present, which fills the light emission plane (2). The plate (20), the side reflectors (12) and the lamellae (15) may constitute an assembly.
Abstract:
A valve (41) comprises an inlet (43), a first outlet (49) and a second outlet (55). A first valve member (57) of the valve (41) cooperates with a valve seat (59) of the first outlet (49), and a second valve member (61) of the valve (41) cooperates with a valve seat (63) of the second outlet (55). The first and second valve members (57, 61) are provided on a common driving shaft (67) which is displaceable by an electric actuator (69) to regulate an air flow through the first outlet (49) and an air flow through the second outlet (55). The first and second valve members (57, 61) are combined into a single integrated valve member (65) which cooperates with both the valve seat (59) of the first outlet (49) and the valve seat (63) of the second outlet (55). A simple and compact structure of the valve (41) is obtained in this manner. The valve (41) is used in an air-assisted fuel-injection system (3) of an internal-combustion engine (1), wherein the first outlet (49) of the valve (41) is connected to a bypass (51) of a throttle valve (29) of the engine (1) and the second outlet (55) of the valve (41) is connected to an air-assisted fuel injector (31) of the fuel-injection system (3). In this manner, both the atomization of the fuel injected by the fuel injector (31) and the idling speed of the engine (1) are controlled by a single valve (41).
Abstract:
The thin-type display device (1) with a vacuum envelope comprises a transparent front wall (3), which is provided with a display screen, and at least an electron source (5) and a duct structure, which cooperates with said electron source (5) and which extends substantially parallel to the front wall (3). Ducts (6, 6', 6'') of the duct structure serve as electron-propagation means and are provided with walls (11, 11', 11'') of an electrically insulating material having a secondary emission coefficient which is suitable for electron propagation. The display device (1) is characterized in that 1 /= 5 mm , where s is the depth of the ducts (6, 6', 6'') and w is the width of the ducts (6, 6', 6''). Preferably, the width w >/= 1.5 mm and the depth 3.5
Abstract:
A picture display device having a vaccum envelope which is provided with a transparent face plate and a display screen having a pattern of luminescent pixels, and with a rear wall, comprising electron-producing means, and addressing system arranged between sais means and the face plate so as to address desired pixels, and, adjacent to the display screen, a plate of electrically insulating material provided with apertures for passing electrons, in operation of voltage difference being applied across said plate, characterized in that the surface at the electron entrance side of the apertured plate is coated with a coating of a material selected from the group comprising substoichiometric nitrides, borides and carbides of A1 and/or Si, and amorphous Si.
Abstract:
A flat display device, preferably of the PALC type, in which the plasma channels are formed by etching laterally-spaced slots in a spacer plate, attaching a thin dielectric sheet over the etched spacer plate, and bonding the etched spacer plate to a transparent substrate such that each channel is formed by the portion of the substrate between flanking walls formed by the etched slots in the spacer plate, adjacent flanking walls in the spacer plate, and the overlying portion of the thin dielectric sheet. In a modification, strengthening crossbars are formed between adjacent flanking walls.
Abstract:
A receiver for receiving reception signals of a first type, for example TV signals, and reception signals of a second type, for example FM-radio signals, is described. The receiver may be used in multimedia applications. In the receiver, a single tuner TUN frequency converts a reception signal RFS into an intermediate frequency signal IFS. For relatively small-size implementations, the following is proposed. The receiver is a single conversion receiver for both types of reception signals, the single conversion being effected in the tuner TUN. Depending on whether a first-type or second-type reception signal is desired, the tuner TUN provides the intermediate frequency signal IFS at a first intermediate frequency IF1 or a second intermediate frequency IF2, respectively. The intermediate frequency signal IFS at intermediate frequency IF1 is processed in a first intermediate frequency signal processor IFSP1. Alternatively, the intermediate frequency signal IFS at the second intermediate frequency IF2 is processed in a second intermediate frequency signal processor IFSP2.
Abstract:
A receiver for receiving reception signals of a first type, for example TV signals, and reception signals of a second type, for example FM-radio signals, is described. The receiver may be used in multimedia applications. In the receiver, an input section TVIN, FMIN, SWIN comprises at least two inputs TVIN, FMIN to which reception signals can be applied. One input TVIN may, for example, be coupled to a cable network via which reception signals are distributed. The other input FMIN may, for example, be used to plug-in a simple wire antenna. In many cases such a wire antenna will be sufficient to receive on-air reception signals with acceptable quality. The invention takes into consideration that on-air reception signals may not always be offered by the cable network. With at least two inputs TVIN, FMIN, there is flexibility of reception.