摘要:
In a holding device for plug-in cards of an electrical device having a card rack forming a frame-like plug-in connection panel or operating panel, the plug-in cards are mounted in parallel with one another on this card rack by means of the front plates provided at one of their edges. Each front plate carries at least one plug-in connector and/or one operating or display element which is arranged in the area of an aperture in the card rack closed by the respective front plate. At least one aperture (16) is larger than the remaining apertures (12, 14). The front plate (50) provided for this aperture (16) carries at least one plug-in connector (54) and/or one operating or display element in a section of its aperture (16) which is enlarged compared with the other apertures.
摘要:
A method and apparatus for soldering surface-mountable components to a printed circuit board includes a soldering head have a suction pipette located in the center of a thermode with a rectangularly arranged set of soldering stirrups. The thermode and suction pipette are individually vertically moveable relative to one another for precise positioning of a surface-mountable component at a predetermined position on a printed circuit board. Soldering at a predetermined solder location with positional correctness is accomplished in a single work cycle.
摘要:
A cooling means is provided for components situated in a vacuum chamber for function testing with focused electron or ion beams. In traditional arrangements, cooling is accomplished with a liquid-cooled metal block that is mounted in the vacuum chamber between the component and an opto-electronic column that generates the electron beam. Coolant is conducted toward the outside of the vacuum chamber via hoses. What is disadvantageous with this solution is the necessity of introducing flow-traversed tubes into the vacuum chamber. Moreover, this solution cannot be realized for components in TAB mounting. In order to avoid these disadvantages, a heat sink is introduced into the vacuum chamber via a sealed opening situated at an upper side of the vacuum chamber. This heat sink is directly contacted to a back side of the component.
摘要:
A merchandise scanner for retail stores includes a horizontal conveyor for transporting merchandise, a scanning window facing an area above the conveyor and an operator console with control elements positioned along side the conveyor and at right angles to the direction of merchandise transport, wherein the conveyor is vertically movable. The scanning window of a scanning device is also vertically movable, either together with or independently of the conveyor so that it can be adjusted in accordance with the size and weight of the merchandise as well as the position of bar codes on the merchandise.
摘要:
Central processing units have two or more groups of in each case one processor, one memory and one coupler, the processor and memory are connected to exactly one coupler and the couplers are connected to one another. A memory area distributed uniformly over the address space is allocated disjointedly to each group by address interleaving and each coupler itself meets an access to the memory area allocated to its group and meets other accesses via the connection to the coupler concerned. The central processing units are provided with interfaces for building up multiple systems.
摘要:
In a memory device for storing data according to the FIFO principle, an input counter is provided having a value which is modified when data are written into a memory, and having a comparison unit that outputs a status signal concerning presence of data in the memory dependent on a comparison of the counter states. A scanning unit is arranged at the connection between the comparison unit and the input counter. The scanning unit scans the state of the input counter according to a clock signal and outputs the scan result to the comparison unit.
摘要:
Cooling and screening device for integrated circuits, have a metal plate (26) having integrally formed cooling projections (28) and having bores (34) extending from the upper side and bottom side of the metal plate (26). Inserted into these bores (34) are contact pins (39) whose free ends form soldering tips (38) which are intended for soldering into plated-through bores (40) of a printed circuit board (20).
摘要:
The process is intended to establish whether the data transmitted by the transmitter (SE) to the receiver (EM) have been tapped and spuriously reintroduced at a later point in time and/or have been inadmissibly altered. For this purpose, the signature (S) assigned to the useful data (D) is enciphered symmetrically, using a combination of coupling data (K), characterizing the coupling between transmitter and receiver, and random data (Z), generated by a random generator. The coupling data are transmitted in plain text, the random data are enciphered. On the receiver side it can be established whether the transmitted message has been tapped and reintroduced at a later point in time if the coupling data are inadmissible. An alteration of the transmitted message can be established from ascertaining that the key used for enciphering the signature, obtained from the combination of coupling data and random data with the aid of a one-way function, does not correspond to the key obtained during deciphering at the receiver and consequently the deciphering of the enciphered signature leads to an incorrect result. The incorrect signature is detected during verification of the signature.