摘要:
A non-sticky water-based coating material in the form of a film applied to the face of a circuit board that is loaded with electronic parts; which comes into contact with the outside environment. The coating material can be formed into the film at room temperature without using a coalescence, does not contain a solvent and forms a membrane having flexibility, low Young's modulus, favorable adhesive properties, moisture resistance and insulating properties. Specifically, the non-sticky water-based conformal coating material includes a resin wherein a flexible acrylic resin having glass transition temperature of at most 0° C. is the main chain and a vinyl polymer having a glass transition temperature of at least 20° C. is grafted to the flexible acrylic resin; the content of the vinyl polymer being 10 to 70% by weight based on the flexible acrylic resin.
摘要:
A non-sticky water-based coating material in the form of a film applied to the face of a circuit board that is loaded with electronic parts; which comes into contact with the outside environment. The coating material can be formed into the film at room temperature without using a coalescence, does not contain a solvent and forms a membrane having flexibility, low Young's modulus, favorable adhesive properties, moisture resistance and insulating properties. Specifically, the non-sticky water-based conformal coating material includes a resin wherein a flexible acrylic resin having glass transition temperature of at most 0° C. is the main chain and a vinyl polymer having a glass transition temperature of at least 20° C. is grafted to the flexible acrylic resin; the content of the vinyl polymer being 10 to 70% by weight based on the flexible acrylic resin.
摘要:
An optical encoder is provided which is not affected by fluctuation of wavelength of a light beam due to temperature change, without sacrificing resolution of measurement. The optical encoder comprises a light source emitting a light beam, a first grating to which the light beam emitted by the light source is directed, and a second grating to which light beams exiting from the first grating is directed. Additionally, displacement information obtaining means is provided for obtaining information for the displacement of one of the first and second gratings, the information being obtained according to a twice-diffracted beam and a twice-transmitted beam at the second grating. The twice-diffracted beam is generated from a diffraction beam generated at the first grating, and the twice-transmitted beam is a transmission beam which has been transmitted through the first grating.
摘要:
An optical encoding apparatus is provided which is not affected by fluctuation of wavelength of a light beam due to temperature change, without sacrificing resolution of measurement. The optical encoding apparatus includes a light source for emitting a light beam, a light beam condenser for condensing the light beam emitted by the light source, a first diffraction grating to which light beams condensed by the light beam condenser are directed, and a second diffraction grating to which light beams exiting from the first diffraction grating are directed. Additionally, a displacement information obtaining device is included for obtaining information regarding a displacement of one of the first and second diffraction gratings, the information being obtained according to a twice-diffracted beam and a twice-transmitted beam incident upon the second diffraction grating. The twice-diffracted beam is diffracted by the first diffraction grating, and the twice-transmitted beam is transmitted through the first diffraction grating.
摘要:
A diffraction grating has incident and emitting side gratings respectively formed on front and rear faces of a diffraction substrate composed of a transparent plane-parallel plate. A pitch .LAMBDA..sub.1 of the incident side grating, a pitch .LAMBDA..sub.2 of the emitting side grating, a refractive index n.sub.1 of the diffraction substrate, a thickness t of the diffraction substrate, and incident angle .theta..sub.1 of light incident to the incident side grating, an angle .theta..sub.2 of diffraction within the diffraction substrate, an emission angle .theta..sub.3 of light emitted from the emitting side grating, a distance T from the emitting side grating to a face for receiving the emitted and diffracted light, and a wavelength .lambda. of the light are set to satisfy the following conditions. ##EQU1##
摘要:
A semiconductor device comprises a semiconductor substrate of a low impurity concentration, a channel region formed on the substrate and having a low impurity concentration, a source region formed on the channel region and having a high impurity concentration of a conductive type opposite to that of the substrate, and a drain region formed on the channel region and having a high impurity concentration of a conductive type opposite to that of the substrate. The source region and the drain region are arranged along a predetermined direction along the substrate. The semiconductor device further includes an accumulating gate region of a conductive type same as that of the substrate, so formed as to surround either one of the source region and drain region, leaving a part of said channel region sandwiched between the source region and the drain region. A current flows from either to the other of the source region and the drain region through the part of the channel region sandwiched between the source region and the region. A charge is accumulated in the accumulating gate region according to the intensity of radiation incident on the device. The potential of the accumulating gate region is variable according to the accumulated charge. The current is variable according to the potential of the accumulating gate region.
摘要:
An air conditioner comprises a water distributor having an opening on its bottom plate, dams around the opening and inverted U-shaped members with a small space formed between the inverted U-shaped plates and the dams so that water in the distributor is guided by a capillary action and distributed to an indoor heat exchanger. A reservoir is disposed to a pipe system between a pump and the indoor heat exchanger so that drain water in the outdoor drain pan is directed to the indoor heat exchanger through the reservoir. The reservoir has a tube which permits excessive water to spill over an opening of the tube to return to the outdoor drain pan through a returning conduit pipe.
摘要:
A device for holding a sheet-like sample includes table means including a reference surface capable of intimately contacting the surface of the sample and a groove formed in the reference surface and capable of being covered by the surface of the sample during the intimate contact, the groove being formed in the shape of a continuous spiral having its center substantially at the center of the reference surface, and exhaust means for exhausting the air in the groove covered by the surface of the sample.
摘要:
The present invention provides a non-sticky water-based coating material, which can be formed into a film at room temperature without using a coalescence, does not contain a solvent and forms a membrane having flexibility, low Young's modulus, favorable adhesive properties, moisture resistance and insulating properties. Specifically, the present invention relates to a non-sticky water-based conformal coating material comprising a resin wherein a flexible acrylic resin having glass transition temperature of at most 0° C. is the main chain and a vinyl polymer having a glass transition temperature of at least 20° C. is grafted to the flexible acrylic resin; the content of the vinyl polymer being 10 to 70% by weight based on the flexible acrylic resin.
摘要:
An optical pick-up having a high-density double diffraction grating constructed with two high-density diffraction gratings superposed on each other wherein polarized light rays are separated so that P-polarized light rays pass through the double diffraction grating and S-polarized light rays are diffracted. The optical pick-up is disposed in the optical path between a light source and a recording medium.