Abstract:
A constant-temperature type crystal oscillator includes: a crystal unit that is installed on one principal surface of a circuit substrate, and chip resistors, which function as heating elements, and which are installed on the other principal surface of the circuit substrate so as to face a principal surface of the crystal unit, the chip resistors heating up the crystal unit to keep an operational temperature of the crystal unit constant. A heating metal film facing the principal surface of the crystal unit is provided on the one principal surface of the circuit substrate. A heat conducting material is interposed between the principal surface of the crystal unit and the heating metal film to perform thermal coupling therebetween. The heating metal film is thermally coupled to electrode terminals of the chip resistors via a plurality of electrode through holes.
Abstract:
Embodiments of the present invention provide an apparatus, a system, and a method, and include a generally rectilinear body having a first surface and a second surface. The second surface is substantially perpendicular to the first surface. An electrically operative element is disposed on the first surface, and has opposite ends. Spaced apart terminations are disposed on the second surface, and are electrically coupled with the opposite ends of the electrically operative element. The terminations are designed to be coupled with a substrate.
Abstract:
A resist 7 of a predetermined thickness is formed on a printed circuit board 1 except electrode-opposing portions 1a (FIG. 1A), and a silk screen printed layer 9 of a predetermined thickness is formed on the resist 7 (FIG. 1B). Thereafter, a concave portion 2b of a film capacitor 2 is bonded to the silk screen printed layer 9 by an adhesive double coated tape 6 of a predetermined thickness in such a manner that electrode portions 2a of the film capacitor 2 are opposed respectively to the electrode-opposing portions 1a of the printed circuit board 1 (FIG. 1D). Here, the sum of the thicknesses of the resist 7, silk screen printed layer 9 and adhesive double coated tape 6 is not smaller than a concave-convex height difference L1 of the film capacitor 2, and with this arrangement the electrode portions 2a of the film capacitor 2 are prevented from interfering with the printed circuit board 1. An adhesive is not used, and therefore a problem with respect to environment-affecting substances is solved, and at the same time difficulty involved in the control of a bonding strength can be overcome.
Abstract:
An oscillator assembly includes an oscillator circuit that is configured to generate a frequency signal. A temperature compensation circuit is in communication with the oscillator circuit and adapted to adjust the frequency signal in response to changes in temperature. The oscillator and temperature compensation circuits are located within an oven. A heater and a temperature sensor in communication with the heater are also both located in the oven. The temperature sensor is adapted to directly control the heater in response to changes in temperature. In one embodiment, the oscillator components are mounted to a ball grid array substrate which, in turn, is mounted on a printed circuit board. In this embodiment, a resonator overlies the ball grid array substrate and a lid covers and defines an oven and enclosure for the resonator and the ball grid array substrate. The oscillator and temperature compensation circuit are defined on the ball grid array substrate.
Abstract:
A device for the shakeproof accommodation of electrical special components and/or electrical circuits, particularly in a development as a second component set in a control unit, is made up of a carrier, onto which a circuit substrate, having special components fastened to it, is mounted in an electrically insulated manner over a partial surface, preferably by adhesion
Abstract:
An electrochemical double layer capacitor (DLC) is configured for mounting on a PCB. A first connector component is configured at each individual terminal lead of the DLC capacitor. A second connector component is mounted on the PCB and includes a number of parallel connector elements at a footprint location for electrical mating contact with the DLC leads. The connector configuration produces a minimal increase in the ESR of the capacitor when mounted on the PCB.
Abstract:
A very small computer memory card is densely packed with a large number of flash EEPROM integrated circuit chips. A computer memory system provides for the ability to removably connect one or more of such cards with a common controller circuit that interfaces between the memory cards and a standard computer system bus. Alternately, each card can be provided with the necessary controller circuitry and thus is connectable directly to the computer system bus. An electronic system is described for a memory system and its controller within a single memory card. In a preferred physical arrangement, the cards utilize a main circuit board with a plurality of sub-boards attached thereto on both sides, each sub-board carrying several integrated circuit chips.
Abstract:
A very small computer memory card is densely packed with a large number of flash EEPROM integrated circuit chips. A computer memory system provides for the ability to removably connect one or more of such cards with a common controller circuit that interfaces between the memory cards and a standard computer system bus. Alternately, each card can be provided with the necessary controller circuitry and thus is connectable directly to the computer system bus. An electronic system is described for a memory system and its controller within a single memory card. In a preferred physical arrangement, the cards utilize a main circuit board with a plurality of sub-boards attached thereto on both sides, each sub-board carrying several integrated circuit chips.
Abstract:
A secondary battery or capacitor fitted with terminals and occupies less area on a packaging substrate. Either one of the positive and negative terminals is mounted within the outer surface of the secondary battery or capacitor. This reduces the area occupied by the secondary battery or capacitor fitted with terminals on the substrate. At least one step is formed on the terminal positioned opposite to the substrate. This prevents electrical shorting between the positive electrode can and the negative terminal.
Abstract:
A very small computer memory card is densely packed with a large number of flash EEPROM integrated circuit chips. A computer memory system provides for the ability to removably connect one or more of such cards with a common controller circuit that interfaces between the memory cards and a standard computer system bus. Alternately, each card can be provided with the necessary controller circuitry and thus is connectable directly to the computer system bus. An electronic system is described for a memory system and its controller within a single memory card. In a preferred physical arrangement, the cards utilize a main circuit board with a plurality of sub-boards attached thereto on both sides, each sub-board carrying several integrated circuit chips.