Abstract: An optical filter is configured to have a regular transmittance of 60% of higher for light having a wavelength of 950 nm. The optical filter is also configured such that in a state in which a light resistance test of irradiating the optical filter for 300 hours with light from a xenon arc lamp having a wavelength not shorter than 300 nm and not longer than 400 nm and a wattage of 120 W/m2 is performed, the optical filter exhibits a change in C* having an absolute value of 6 or smaller between before and after the light resistance test, the C* being measured by the SCE method by use of a spectrophotometer.

Abstract: An optical filter is configured to have a regular transmittance of 60% or higher for light having a wavelength of 950 nm. The optical filter is also configured to be contracted by being heated at a temperature of 85° C. or higher, or a size change of the optical filter occurs from room temperature to 300° C. as monotonous increase in a tensile mode of a thermomechanical analyzer (TMA).

Abstract: Provided are a photon up-conversion film, which is capable, of high-efficiency up-conversion even in air and even when low-intensity light is used, and a simple method of producing the film. The photon up-conversion film according to one embodiment of the present invention includes: a matrix including a resin; and a pore portion, wherein the photon up-conversion film includes at least a sensitizing component capable of absorbing light in a first wavelength region ?1, and a light-emitting component capable of radiating light in a second wavelength region ?2 including wavelengths shorter than those of the first wavelength region ?1, and wherein the sensitizing component and the light-emitting component are present at an interface between the matrix and the pore portion.

Abstract: An optical filter has a back-scattering property. The linear transmittance thereof to light of at least some avelengths in the wavelength range of 760-2000 nm is 60% or higher. The azimuth is 20° from an incidence plane when the polar angle of the direction of incidence of incident light is 0°. The value of a bidirectional reflectance distribution function in the direction ‘here the polar angle is ?60’ is BRDF (0°; 20°, ?60°). The azimuth is 20° from an incidence plane when the polar angle of the direction of incidence of incident light is 30°. The value of a bidirectional reflectance distribution function in the direction where the polar angle is ?60° is BRDF (30°; 20°, ?60°). The azimuth is 20° from an incidence plane when the polar angle of the direction of incidence of incident light is 60°.

Abstract: Disclosed is an optical filter with L* measured by the SCE method being 20 or greater, wherein: the linear transmittance with respect to light with wavelengths being at least a portion of a wavelength range from 760 nm to 2000 nm is 60% or greater; and, before and after a light resistance test wherein light of a xenon arc lamp (average integrated illuminance of light with wavelengths from 300 nm to 400 nm:120 W/m2) is shone for 300 hours, the absolute value of a change in C* measured by the SCE method using a spectroscopic colorimeter is 6 or less.

Abstract: This optical filter 10 has an L* of at least 20 as measured by the SCE method, wherein the linear transmittance is at least 60% with respect to light the wavelength of which falls at least partially within the wavelength range of 760 nm-2,000 nm, and the temperature, at which the optical filter contracts by being heated, is at least 85° C.

Abstract: Provided are a photon up-conversion film, which is capable of high-efficiency up-conversion even in air and even when low-intensity light is used, and a simple method of producing the film. The photon up-conversion film according to one embodiment of the present invention includes: a matrix including a resin; and a pore portion, wherein the photon up-conversion film includes at least a sensitizing component capable of absorbing light in a first wavelength region ?1, and a light-emitting component capable of radiating light in a second wavelength region ?2 including wavelengths shorter than those of the first wavelength region ?1, and wherein the sensitizing component and the light-emitting component are present at an interface between the matrix and the pore portion.

Abstract: A piezoelectric device has a layered structure in which at least a first electrode, a plastic layer, an orientation control layer, a piezoelectric layer, and a second electrode are stacked, wherein the orientation control layer is amorphous, and the piezoelectric layer with a thickness of 20 nm to 250 nm is provided over the orientation control layer, the piezoelectric layer having a wurtzite crystal structure, and wherein the orientation control layer and the piezoelectric layer are provided between the first electrode and the second electrode.

Abstract: An optical filter (10) comprises a matrix (12) and fine particles (14) dispersed in the matrix (12), wherein the fine particles (14) have a parameter Ds of 8.0 to 30 inclusive, Ds being determined by a USAXS pattern and given by Ds=?/(B·cos ?·Ra), where ? is the X-ray wavelength, ? is one half the scattering angle 2?(rad) providing a scattering intensity peak, B is the half width (FWHM, rad) of the peak, and Ra is the average particle size of the fine particles (14).

Abstract: Disclosed is an optical filter with L* measured by the SCE method being 20 or greater, wherein: the linear transmittance with respect to light with wavelengths being at least a portion of a wavelength range from 760 nm to 2000 nm is 60% or greater; and, before and after a light resistance test wherein light of a xenon arc lamp (average integrated illuminance of light with wavelengths from 300 nm to 400 nm:120 W/m2) is shone for 300 hours, the absolute value of a change in C* measured by the SCE method using a spectroscopic colorimeter is 6 or less.

Abstract: This optical filter 10 has an L* of at least 20 as measured by the SCE method, wherein the linear transmittance is at least 60% with respect to light the wavelength of which falls at least partially within the wavelength range of 760 nm-2,000 nm, and the temperature, at which the optical filter contracts by being heated, is at least 85° C.

Abstract: This optical filter has a back-scattering property, and the linear transmittance thereof to light of at least some wavelengths in the wavelength range of 760-2000 nm is 60% or higher.

Abstract: A sound source for an electronic percussion instrument and sound production control method thereof are provided. An electronic drum sound source device performs a weighting operation on four pieces of waveform information (pitch envelope, amplitude envelope, start phase) stored in a waveform table according to the beating conditions (hitting point position, velocity) based on the output from a struck sensor of an electronic drum pad. The electronic drum sound source device creates a sine wave on the basis of the waveform information whereon the weighting operation was performed, and generates musical sounds (sounds of percussion instrument) by synthesizing the sine wave with the waveforms of residual waveform data whereon the weighting operation was performed. The sine wave is not synthesized with waveform data other than the residual waveform data, and thus consistent musical sounds with no phase interference can be reproduced.

Abstract: A sound source for an electronic percussion instrument and sound production control method thereof are provided. An electronic drum sound source device performs a weighting operation on four pieces of waveform information (pitch envelope, amplitude envelope, start phase) stored in a waveform table according to the beating conditions (hitting point position, velocity) based on the output from a struck sensor of an electronic drum pad. The electronic drum sound source device creates a sine wave on the basis of the waveform information whereon the weighting operation was performed, and generates musical sounds (sounds of percussion instrument) by synthesizing the sine wave with the waveforms of residual waveform data whereon the weighting operation was performed. The sine wave is not synthesized with waveform data other than the residual waveform data, and thus consistent musical sounds with no phase interference can be reproduced.

Abstract: A piezoelectric device has a layered structure in which at least a first electrode, a plastic layer, an orientation control layer, a piezoelectric layer, and a second electrode are stacked, wherein the orientation control layer is amorphous, and the piezoelectric layer with a thickness of 20 nm to 250 nm is provided over the orientation control layer, the piezoelectric layer having a wurtzite crystal structure, and wherein the orientation control layer and the piezoelectric layer are provided between the first electrode and the second electrode.

Abstract: An electronic percussion instrument that detects vibrations due to a hit and outputs a corresponding signal where the head of the instrument is held in place independent of a rim part. The independence stops vibrations originating from a hit of the rim from traveling to the head and interfering with the proper signal detection of hits to the head part.

Abstract: An object of the present invention is to provide a percussion detecting apparatus, which is excellent in percussion feeling, and the percussion sounds of which are very small, in electronic percussion instrumental system. The percussion detecting apparatus is provided with a head prepared from a net-like raw material composed of a first net and a second net, the net-like raw material being obtained by such a manner that both the nets having been woven in accordance with plane weaving manner wherein the longitudinal and transverse fibers cross at right angles are laminated in such a way that the weave pattern directions thereof intersect obliquely with each other; and a head sensor which is in contact with the center position of the under side in the head and detects percussion with respect to the head as electric signal.

Abstract: An electronic percussion instrument that detects vibrations due to a hit and outputs a corresponding signal where the head of the instrument is held in place independent of a rim part. The independence stops vibrations originating from a hit of the rim from traveling to the head and interfering with the proper signal detection of hits to the head part.

Abstract: An object of the present invention is to provide a percussion detecting apparatus, which is excellent in percussion feeling, and the percussion sounds of which are very small, in electronic percussion instrumental system. The percussion detecting apparatus is provided with a head prepared from a net-like raw material composed of a first net and a second net, the net-like raw material being obtained by such a manner that both the nets having been woven in accordance with plane weaving manner wherein the longitudinal and transverse fibers cross at right angles are laminated in such a way that the weave pattern directions thereof intersect obliquely with each other; and a head sensor which is in contact with the center position of the under side in the head and detects percussion with respect to the head as electric signal.

Abstract: An object of the present invention is to provide a percussion detecting apparatus, which is excellent in percussion feeling, and the percussion sounds of which are very small, in electronic percussion instrumental system. The percussion detecting apparatus is provided with a head prepared from a net-like raw material composed of a first net and a second net, the net-like raw material being obtained by such a manner that both the nets having been woven in accordance with plane weaving manner wherein the longitudinal and transverse fibers cross at right angles are laminated in such a way that the weave pattern directions thereof intersect obliquely with each other; and a head sensor which is in contact with the center position of the under side in the head and detects percussion with respect to the head as electric signal.