摘要:
To evaluate cleanliness of wafer accommodating members used for storing or transporting of silicon, gallium arsenide or like semiconductor wafers, pure water is poured into a vessel-like wafer accommodating member, such as a wafer case body, a top cover, etc., capable of containing liquid therein, and then low frequency vibrations or supersonic wave is applied to the member. Alternatively, inner wafer accommodating members accommodated in the wafer case body, such as a wafer basket, a wafer retainer, etc., are accommodated in a vessel containing poured pure water, and the low frequency vibrations or supersonic wave is applied to the members. Then, the quantity of particles in the water is counted. Particles that have been attached to the wafer case or to inner wafer accommodating members accommodated therein, such as a wafer basket, a wafer retainer, etc., are made readily separable into the water, thus permitting quantitative detection of generation of particles from the inner wafer accommodating members.
摘要:
A target cell detection method includes performing a test measurement on a dispersion to obtain a measurement result 1, the test measurement being an optical or electromagnetic measurement, and the dispersion including labeled particles and target cells, the labeled particles being particles on each of which a substance that specifically binds to a specific molecule present on a surface of each of the target cells is immobilized, performing measurement that is identical with the test measurement on a dispersion that includes the target cells, but does not include the labeled particles to obtain a measurement result 2, and comparing the measurement result 1 with the measurement result 2.
摘要:
The present invention is a method for producing a polishing agent in which silica particles are dispersed in an aqueous solution, comprising at least a step of removing metal compound ions from a prepared silica sol by ion exchange (B); a step of purifying further the ion-exchanged silica sol (D); a step of adding alkali metal hydroxide to the purified silica sol (F); and a step of adding an acid to the silica sol to which the alkali metal hydroxide is added (G). There is provided a method for producing a polishing agent which can extremely effectively suppress metal contamination when a silicon wafer or the like is polished can be produced.
摘要:
There is provided a speaker damper comprising: an inner frame for inserting and holding a voice coil bobbin; an outer frame to be fixed on to a speaker frame in a speaker unit; a plurality of flexibly movable supporting arms bridged across a space between the inner frame and the outer frame; a plurality of reinforcing members each bridged across a space between two flexibly movable supporting arms adjacent to the inner frame.
摘要:
The present invention provides a printed circuit board installed in a lens barrel with an imaging optical system. In an installed state, the printed circuit board comprises: a ring-shaped portion disposed substantially perpendicular to the optical axis of the imaging optical system wherein an aperture is provided at a central portion of the ring-shaped portion so that an imaging light beam may pass through the aperture; and an extending board portion that extends outward from the ring-shaped portion wherein electrical components may be mounted on the surface of the extending board portion. After the ring-shaped portion and the extending board portion have been bent, the above-described flexible printed circuit board is inserted into the lens barrel in such a manner that the plane of the extending board portion on which the electrical components are mounted is parallel to the optical axis of the imaging optical system. This printed circuit board provides high efficiency electrical interconnections in the lens barrel.
摘要:
The present invention is a silicon single crystal grown by CZ method, wherein Cu precipitates do not exist inside the silicon single crystal, a silicon wafer produced from the silicon single crystal, wherein Cu precipitates do not exist on a surface of and inside the wafer, and an apparatus for producing a silicon single crystal according to CZ method, wherein Cu concentration in a component made of quartz to be used in a part in which a temperature in a furnace for single crystal growth is 1000° C. or more is 1 ppb or less, and Cu concentration in a component made of quartz to be used in a part in which a temperature in a furnace for single crystal growth is less than 1000° C. is 10 ppb or less, and a method for producing a silicon single crystal by using the producing apparatus. Thereby, there are provided a silicon single crystal and a silicon wafer which have extremely few crystal defects and have high quality and high yield, a producing apparatus therefor, and a producing method therefor.
摘要:
This invention discloses a device for rotating a traveling-wave-type ultrasonic motor having an electromechanical conversion device to which two-phase AC signals generated from a DC power source and having a phase difference of 90 degrees are supplied, the device for rotating a traveling-wave-type ultrasonic motor comprising:(a) a pulse generating circuit for generating exclusive four-phase pulse signals, the output frequency of each of which can be varied in response to a predetermined supplied digital signal;(b) an electric power amplifying circuit including switching devices for responding to the four-phase pulse signals and transformers and generating two-phase AC signal having a phase difference of 90 degrees, the two-phase AC signals being supplied to the ultrasonic motor;(c) a waveform shaping circuit that receives one of the two-phase AC signals to convert an amplitude of the AC voltage into a DC voltage; and(d) a phase comparison circuit which receives an output signal from the waveform shaping circuit and a signal from one of the four-phase pulse signals that corresponds to the signal received by the waveform shaping circuit to detect the phase difference between the output signal and the signal in a certain phase, the phase comparison circuit transmitting an output which is received by the pulse generating circuit, wherein the output frequency from the pulse generating circuit is determined so that the phase difference is made to be a predetermined value.
摘要:
Disclosed is a camera loaded selectively with either a first film having perforations formed in side edges or a second film having the same width as that of the first film and no perforations formed in side edges. The camera comprises: a picture size changeover device for selectively setting a photographing picture frame to a first picture size corresponding to the first film and a second picture size corresponding to the second film; a first lens installable and removable in and from the camera and having an image circle corresponding to the first picture size; a second lens installable and removable in and from the camera and having an image circle corresponding to the second picture size; and a device for judging which lens, the first lens or the second lens, to install in the camera. When the judging device judges that the first lens is installed in a state where the picture size is set to the second picture size, the picture size is so set as to be forcibly changed over to the first picture size.