Abstract: A piercing processing method and a laser processing machine capable of carrying out a piercing processing on a thick plate in short time are provided. It is a processing method for carrying out a piercing processing on a metallic material by laser beams with wavelengths in 1 ?m band, where the piercing processing is carried out by maintaining a range of 8?Zr/d?12 when a condensed beam diameter of the laser beams is set to be d and a Rayleigh length of the laser beams is set to be Zr. At that time, a focal position of the laser beams is set to be on a surface of a workpiece or an external of the workpiece. Then, a beam profile of the laser beams is such that the laser beams of a single mode are converted into a bowler hat shape by a beam quality tunable device.

Abstract: Using a transmission fiber for transmitting laser beams of multiple wavelengths oscillated by a DDL module, and a laser processing machine for cutting a sheet metal with a processing head that condenses the laser beams of multiple wavelengths and irradiates them onto the sheet metal, a mild steel plate or an aluminum plate is cut, and by cutting a mild steel plate with a thickness greater than or equal to 1 mm and less than or equal to 5 mm, a surface roughness (Ra) of a cut surface of the cut mild steel plate is less than or equal to 0.4 ?m, and when an aluminum plate with a thickness greater than or equal to 1 mm and less than or equal to 5 mm is cut, a surface roughness (Ra) of a cut surface of the cut aluminum plate is less than or equal to 2.5 ?m.

Abstract: There is provided a headphone including a headband having flexibility; a slider having flexibility with the headband attached at one end, and a headphone unit attached at the other end; a slide groove, arranged at an end of the headband or the one end of the slider, for guiding a circling movement of the slider with respect to the headband; and a slider guide, having rigidity higher than the headband and the slider, for holding the one end of the slider at the end of the headband so that one surface of the slider facing one surface of the headband circling moves with respect to the one surface of the headband while being engaged to the slide groove. A headphone that can be thinned while suppressing lowering of the attachment property is provided.

Abstract: A laser cutting method and a laser cutting apparatus cut a metallic work with a laser beam of a one-micrometer waveband. The method and apparatus carry out the laser cutting of the work with a ring beam RB passed through a focus position of a condenser lens 13 and having inner and outer diameters that tend to expand. The outer diameter of the ring beam is in a range of 300 ?m (micrometers) to 600 ?m, an inner diameter ratio of the same is in a range of 30% to 70%, and a focal depth of the condenser lens is in a range of 2 mm to 5 mm.

Abstract: There is provided a headphone including a headband having flexibility; a slider having flexibility with the headband attached at one end, and a headphone unit attached at the other end; a slide groove, arranged at an end of the headband or the one end of the slider, for guiding a circling movement of the slider with respect to the headband; and a slider guide, having rigidity higher than the headband and the slider, for holding the one end of the slider at the end of the headband so that one surface of the slider facing one surface of the headband circling moves with respect to the one surface of the headband while being engaged to the slide groove. A headphone that can be thinned while suppressing lowering of the attachment property is provided.

Abstract: There is provided a headphone including a headband having flexibility; a slider having flexibility with the headband attached at one end, and a headphone unit attached at the other end; a slide groove, arranged at an end of the headband or the one end of the slider, for guiding a circling movement of the slider with respect to the headband; and a slider guide, having rigidity higher than the headband and the slider, for holding the one end of the slider at the end of the headband so that one surface of the slider facing one surface of the headband circling moves with respect to the one surface of the headband while being engaged to the slide groove. A headphone that can be thinned while suppressing lowering of the attachment property is provided.

Abstract: A variable illumination apparatus includes: a first substrate; a second substrate opposed to the first substrate with a predetermined gap therebetween; a surrounding wall that is disposed between the first and second substrates, has a first opening and a second opening opposed to each other, and has an inner side surface that is tapered toward the second opening from the first opening; a partition wall to partition a liquid chamber formed by the first substrate, the second substrate, and the surrounding wall into regions, the partition wall being vertical to the first substrate and the second substrate; a liquid lens having a lens surface that is formed at an interface between two liquids and is electrically deformable, the two liquids being accommodated in each of the regions and each having a different refractive index; and a light source to irradiate light to the liquid lens from the first opening side.

Abstract: A manufacturing method for a liquid lens device includes: preparing a body having a liquid chamber, a conductive first liquid stored in the liquid chamber, an insulating second liquid stored in the liquid chamber, an electrode kept in contact with the first liquid, and a liquid discharge passage for making the communication between the inside and the outside of the liquid chamber; applying pressure to the first and second transparent substrates to thereby compress the sealing member and discharge the first liquid through the liquid discharge passage to the outside of the liquid chamber; and closing the liquid discharge passage.

Abstract: Disclosed herein is an optical device including: a light-transmitting first main body which constitutes a part on a light incidence side; a light-transmitting second main body which constitutes a part on a light outgoing side; a third main body which is stacked between the first main body and the second main body in a second direction orthogonal to the first direction, and which defines a liquid chamber between the first main body and the second main body; a lens surface which is formed by an interface between a plurality of liquids differing in refractive index and sealed in the inside of the liquid chamber, and which is electrically deformable; and a jig which clamps the mutually stacked first main body, second main body, and third main body in the second direction by the third engaging part and the fourth engaging part.

Abstract: An ear pad for use with a headphone apparatus. The ear pad comprises a pad portion comprising an outer circumference and an inner circumference defining an opening. The pad portion comprises an upper width between the outer and inner circumferences along a vertical mid-line of the pad portion, a lower width between the outer and inner circumferences along the vertical mid-line of the pad portion, a left side width between the outer and inner circumferences along a horizontal mid-line of the pad portion, and a right side width between the outer and inner circumferences along the horizontal mid-line of the pad portion. The lower width of the pad portion is greater than at least one of the left and right side widths of the pad portion.

Abstract: A variable illumination apparatus includes: a first substrate; a second substrate opposed to the first substrate with a predetermined gap therebetween; a surrounding wall that is disposed between the first and second substrates, has a first opening and a second opening opposed to each other, and has an inner side surface that is tapered toward the second opening from the first opening; a partition wall to partition a liquid chamber formed by the first substrate, the second substrate, and the surrounding wall into regions, the partition wall being vertical to the first substrate and the second substrate; a liquid lens having a lens surface that is formed at an interface between two liquids and is electrically deformable, the two liquids being accommodated in each of the regions and each having a different refractive index; and a light source to irradiate light to the liquid lens from the first opening side.

Abstract: A manufacturing method for a liquid lens device includes: preparing a body having a liquid chamber, a conductive first liquid stored in the liquid chamber, an insulating second liquid stored in the liquid chamber, an electrode kept in contact with the first liquid, and a liquid discharge passage for making the communication between the inside and the outside of the liquid chamber; applying pressure to the first and second transparent substrates to thereby compress the sealing member and discharge the first liquid through the liquid discharge passage to the outside of the liquid chamber; and closing the liquid discharge passage.

Abstract: Disclosed is a liquid lens element. The liquid lens element includes a main body, a lens surface, and a first reflection surface. The main body has a light incident surface and a light exiting surface and includes a liquid chamber formed therein. The lens surface changes orientation of light that exits the light exiting surface by being electrically deformed, and the lens surface is formed of an interface between two liquids that are contained in the liquid chamber and have different refractive indexes. The first reflection surface reflects part of light that enters the light incident surface toward an optical axis of the lens surface, and the first reflection surface is provided to the main body.

Abstract: Disclosed herein is an optical device including: a light-transmitting first main body which constitutes a part on a light incidence side; a light-transmitting second main body which constitutes a part on a light outgoing side; a third main body which is stacked between the first main body and the second main body in a second direction orthogonal to the first direction, and which defines a liquid chamber between the first main body and the second main body; a lens surface which is formed by an interface between a plurality of liquids differing in refractive index and sealed in the inside of the liquid chamber, and which is electrically deformable; and a jig which clamps the mutually stacked first main body, second main body, and third main body in the second direction by the third engaging part and the fourth engaging part.

Abstract: There is provided a headphone including a headband having flexibility; a slider having flexibility with the headband attached at one end, and a headphone unit attached at the other end; a slide groove, arranged at an end of the headband or the one end of the slider, for guiding a circling movement of the slider with respect to the headband; and a slider guide, having rigidity higher than the headband and the slider, for holding the one end of the slider at the end of the headband so that one surface of the slider facing one surface of the headband circling moves with respect to the one surface of the headband while being engaged to the slide groove. A headphone that can be thinned while suppressing lowering of the attachment property is provided.

Abstract: In an electron gun for a CRT in which a plurality of cylindrical electrodes are arranged and fixed in series to control a path of electron beams emitted from a cathode, a cylindrical support member is disposed between at least two adjacent cylindrical electrodes so that the two cylindrical electrodes are arranged coaxially. One end portion of the cylindrical support member and one cylindrical electrode are fixed to each other by fitting the former into the latter or vice versa, and the other end portion of the cylindrical support member and the other cylindrical electrode are fixed to each other by fitting the former into the latter or vice versa.