摘要:
A unidirectional microphone includes a cylindrical capsule, a front plate blocking one end of the cylindrical capsule, a front plate sound hole formed in the front plate, a vibrating membrane and a first rear pole plate that are housed in the cylindrical capsule and form capacitance, a substrate blocking another open end of the capsule, and a rear plate sound hole formed in the substrate. The front plate sound hole and the rear plate sound hole are placed on mutually opposite sides of a central axis of the capsule so as to be offset relative to the central axis. The directional axis can be significantly offset relative to the central axis of the microphone using the microphone alone.
摘要:
A microphone capable of canceling vibration noise caused by mechanical vibration is provided with, in capsules, a pair of diaphragms and a pair of back plates opposite to the respective diaphragms. A printed circuit board is disposed at the middle of capsules. A pair of diaphragms is disposed close and opposite to the surfaces of the printed circuit board with the printed circuit board disposed therebetween. The difference in distance from a vibration source to the two diaphragms is made small. The microphone has a high canceling effect for canceling vibration noise caused by mechanical vibration.
摘要:
Disclosed is a cylinder liner having a high bonding strength to a cylinder block. Further disclosed is a method for producing the same. The cylinder liner uses a silicon-aluminum alloy as a material; a plurality of protrusions are formed on the external surface thereof; and the protrusions each contain a pillar section extending from the external surface, and a head section formed at the end of the pillar section.
摘要:
There is provided a condenser microphone that has improved portability and that can be realized at low costs. The condenser microphone includes, as all being accommodated within a cylindrical housing, a capacitor including a diaphragm electrode and a fixed electrode, a signal processing circuit board disposed at one opening of the cylindrical housing and having a converter circuit for converting a change in capacitance of the capacitor which has occurred in association with vibration of the diaphragm electrode into an electric signal and outputting this electric signal, a gate ring disposed between the capacitor and the signal processing circuit board for establishing electric conduction therebetween, a switch circuit board disposed at the other opening of the cylindrical housing and having a switch for controlling operation of the converter circuit, and a drain ring disposed between the switch circuit board and the signal processing circuit board for transmitting a switch signal according to an operation of the switch to the signal processing circuit board.
摘要:
An engine component is composed of an aluminum alloy containing silicon, and includes a plurality of primary-crystal silicon grains located on a slide surface. The plurality of primary-crystal silicon grains have an average crystal grain size of no less than about 12 μm and no more than about 50 μm.
摘要:
A connecting rod is a fracture split-type connecting rod made of an α+β type titanium alloy, including a rod main body and a big end provided at an end of the rod main body, the big end being fracture-split. The structure of the rod main body is an equiaxed α structure, and the structure of fractured surfaces of the big end is an acicular α structure.
摘要:
A motorcycle fuel tank according to a preferred embodiment of the present invention includes an upper shell, and a lower shell including a body and fixing portions. The lower shell body is bonded to the upper shell and arranged to define a fuel storage space with the upper shell. The fixing portions are used to fix the lower shell body onto a motorcycle body. The lower shell is made of an aluminum alloy and the lower shell body and the fixing portions are formed by a casting process such that the fixing portions are integral with the lower shell.
摘要:
The present invention provides a liquid crystal display device which can obviate the generation of leaking of light and display irregularities in the vicinities of so-called dummy pixels. The liquid crystal display device includes a pair of substrates which are arranged to face each other in an opposed manner with liquid crystal sandwiched therebetween, a plurality of gate signal lines and a plurality of drain signal lines which are formed on one substrate in a matrix array, a plurality of pixel regions defined by the gate signal lines and the drain signal lines, and a reference electrode and a pixel electrode which are formed in the inside of each pixel region. In such a constitution, the plurality of pixel regions are formed in both a display region and a non-display region, and a voltage applied to the reference electrodes is applied to the pixel electrodes in the inside of the pixel regions in the non-display region.
摘要:
Affixed in intimate contact to the inside surface of a front board 10a of a conductive capsule 10 provided with a receiving sound aperture 10aa is a conductive back electrode board provided with air vent apertures 11a, 11b which are positioned not in alignment with the receiving sound aperture, these apertures 10a and 11a, 11b being connected by a slit 10ad. A polarized FEP film 12 which is an electret film is disposed on the surface of the back electrode board 11 opposite from the front board 10a, and a conductive diaphragm 14 is disposed on the surface of the FEP 12 opposite from the back electrode board 11 with a spacer 13 interposed therebetween which extends around the outer periphery of the opposite surface of the FEP 12. These component parts are accommodate in the capsule 10 to constitute an electret condenser microphone which is capable of suppressing sensitivity degradation due to ingress of grit from the outside to the electret film.
摘要:
An inlet/outlet pipe extending downward from a bottom face of a body for a ladle is bent at its tip end into an S-shape in an intermediate portion of the pipe, and its tip end is located at a level higher than that of the bent portion. When a negative pressure in the ladle body is increased, a height of range of a molten metal is increased before and after an occurrence of disturbance in the ladle body, so that the negative pressure in the ladle body is made balance with a weight of the molten metal. Thereby, the molten metal is measured and held at a constant volume in the ladle body.