Abstract: A linear light source includes light emitting elements 5 which are arranged on a square rod-shaped printed board 4 along the longitudinal direction thereof and reflectors 6 which are arranged alternately with the light emitting elements 5. The opposing surfaces 6a of the reflectors 6 sandwiching the light emitting element are inclined such that the distance between the opposing surfaces of the reflectors increases in the direction of light emitted from the light emitting element 5. The linear light source further includes resin seal layers 10 which are in the form of a trapezoidal prism or a truncated pyramid and formed by filling recesses, each of which is defined by the printed board 4, light emitting element 5 and reflectors 6, with a light-transmissive resin sealant. A strip-shaped reflection member made of a reflection sheet 1 or a vapor-deposited film 12 is arranged to cover a region ranging from the end face of the printed board 4 adjoining to the component side to the tips of the reflectors 6.

Abstract: A chip-type light-emitting semiconductor device includes: a substrate 4; a blue LED 1 mounted on the substrate 4; and a luminescent layer 3 made of a mixture of yellow/yellowish phosphor particles 2 and a base material 13 (translucent resin). The yellow/yellowish phosphor particles 2 is a silicate phosphor which absorbs blue light emitted by the blue LED 1 to emit a fluorescence having a main emission peak in the wavelength range from 550 nm to 600 nm, inclusive, and which contains, as a main component, a compound expressed by the chemical formula: (Sr1-a1-b1-xBaa1Cab1Eux)2SiO4 (0?a1?0.3, 0?b1?0.8 and 0<x<1). The silicate phosphor particles disperse substantially evenly in the resin easily. As a result, excellent white light is obtained.

Abstract: A chip-type light-emitting semiconductor device includes: a substrate 4; a blue LED 1 mounted on the substrate 4; and a luminescent layer 3 made of a mixture of yellow/yellowish phosphor particles 2 and a base material 13 (translucent resin). The yellow/yellowish phosphor particles 2 is a silicate phosphor which absorbs blue light emitted by the blue LED 1 to emit a fluorescence having a main emission peak in the wavelength range from 550 nm to 600 nm, inclusive, and which contains, as a main component, a compound expressed by the chemical formula: (Sr1-a1-b1-xBaa1Cab1Eux)2SiO4 (0?a1?0.3, 0?b1?0.8 and 0<x<1). The silicate phosphor particles disperse substantially evenly in the resin easily. As a result, excellent white light is obtained.

Abstract: A chip-type light-emitting semiconductor device includes: a substrate 4; a blue LED 1 mounted on the substrate 4; and a luminescent layer 3 made of a mixture of yellow/yellowish phosphor particles 2 and a base material 13 (translucent resin). The yellow/yellowish phosphor particles 2 is a silicate phosphor which absorbs blue light emitted by the blue LED 1 to emit a fluorescence having a main emission peak in the wavelength range from 550 nm to 600 nm, inclusive, and which contains, as a main component, a compound expressed by the chemical formula: (Sr1?a1?b1?xBaa1Cab1Eux)2SiO4 (0?a1?0.3, 0?b1?0.8 and 0<x<1). The silicate phosphor particles disperse substantially evenly in the resin easily. As a result, excellent white light is obtained.

Abstract: A light-emitting diode 1 according to the present invention includes: a semiconductor light-emitting device 4 mounted on the surface of lead frames 2 and 3; and a transparent resin package 5 covering the front side of the semiconductor light-emitting device 4. A convex lens portion 8 for concentrating light emitted from the semiconductor light-emitting device 4 toward the front is provided in a surface part of the resin package 5. A circular flat portion 11 for diffusing light emitted from the semiconductor light-emitting device 4 toward the sides is provided in a part of the convex lens portion 8 intersecting the optical axis of the convex lens portion 8. Part of the convex lens portion 8 surrounding the circular flat portion 11 is a convex-lens side face. A recess 7 whose side wall is partly the convex-lens side face is provided to surround the convex lens portion.

Abstract: A chip-type light-emitting semiconductor device includes: a substrate 4; a blue LED 1 mounted on the substrate 4; and a luminescent layer 3 made of a mixture of yellow/yellowish phosphor particles 2 and a base material 13 (translucent resin). The yellow/yellowish phosphor particles 2 is a silicate phosphor which absorbs blue light emitted by the blue LED 1 to emit a fluorescence having a main emission peak in the wavelength range from 550 nm to 600 nm, inclusive, and which contains, as a main component, a compound expressed by the chemical formula: (Sr1-a1-b1-xBaa1Cab1Eux)2SiO4 (0?a1?0.3, 0?b1?0.8 and 0<x<1). The silicate phosphor particles disperse substantially evenly in the resin easily. As a result, excellent white light is obtained.

Abstract: In an LED lamp, a Zener diode is mounted on a copper plate, and a GaN-based light-emitting element is mounted on the Zener diode with an electrode of the element being oriented facedown. Two Zener diodes close to the center of the LED lamp are mounted on a common copper plate, thereby interconnecting the two light-emitting elements in series. Consequently, a Zener diode is connected to the respective two Zener diodes by means of a wire serving as a conductive member. Four light-emitting elements are connected in series, so that four light-emitting elements are connected in series, thus completing a circuit configuration. In this way, use of the Zener diodes for interconnection purpose enables a reduction in the number of minimum required wires. It is better to connect the wire to the upper surfaces of the Zener diodes, thereby obviating a necessity for a redundant wire space and enabling miniaturization of the LED lamp.

Abstract: A chip-type light-emitting semiconductor device includes: a substrate 4; a blue LED 1 mounted on the substrate 4; and a luminescent layer 3 made of a mixture of yellow/yellowish phosphor particles 2 and a base material 13 (translucent resin). The yellow/yellowish phosphor particles 2 is a silicate phosphor which absorbs blue light emitted by the blue LED 1 to emit a fluorescence having a main emission peak in the wavelength range from 550 nm to 600 nm, inclusive, and which contains, as a main component, a compound expressed by the chemical formula: (Sr1−a1−b1−xBaa1Cab1Eux)2SiO4 (0≦a1≦0.3, 0≦b1≦0.8 and 0<x<1). The silicate phosphor particles disperse substantially evenly in the resin easily. As a result, excellent white light is obtained.

Abstract: In an LED lamp, a Zener diode is mounted on a copper plate, and a GaN-based light-emitting element is mounted on the Zener diode with an electrode of the element being oriented facedown. Two Zener diodes close to the center of the LED lamp are mounted on a common copper plate, thereby interconnecting the two light-emitting elements in series. Consequently, a Zener diode is connected to the respective two Zener diodes by means of a wire serving as a conductive member. Four light-emitting elements are connected in series, so that four light-emitting elements are connected in series, thus completing a circuit configuration. In this way, use of the Zener diodes for interconnection purpose enables a reduction in the number of minimum required wires. It is better to connect the wire to the upper surfaces of the Zener diodes, thereby obviating a necessity for a redundant wire space and enabling miniaturization of the LED lamp.

Abstract: An electromagnetic control valve is provided. The control stability of the electromagnetic control valve is improved because: (1) one end of the guide pin is forced into and then secured in a hole formed in the center of the coil guide so that the plunger moves in the center of the suction portion; (2) one end of the connecting rod is forced into and then secured in a hole formed in the center of the plunger, and a guide portion for guiding the connecting rod is provided in the center of the upper main body; or (3) the connecting rod is forced into and then secured in a hole formed in the center of the plunger, and a first guide portion for guiding the connecting rod is provided at the lower end of the coil guide and/or a second guide portion for guiding the connecting rod is provided at the lower end of the upper main body.

Abstract: This invention provides an expansion valve combined with a solenoid valve which prevents a water hammer phenomenon from occurring when a refrigerant passage is opened and closed by the solenoid valve. Refrigerant passages (P1, P2) are formed in a valve body (1) between a primary port (1a) and a secondary port (1b). The solenoid valve (V) attached to the valve body (1) opens and closes the refrigerant passages (P1, P2) in their intermediate portion. An expansion valve disk (6)--which is moved by the action of a diaphragm (8) that defines an outer pressure chamber (R2) communicating to a temperature sensing cylinder (E) and an inner pressure chamber (R1)--is brought into and out of engagement with a valve seat (S1) formed on the primary port (1a) side of the refrigerant passage (P1). The secondary port (1b) side and the inner pressure chamber (R1) are communicated via an inner pressure equalizing hole (15) formed in the valve body (1).

Abstract: A handpiece for preventing the visual field of an endoscope from being disturbed by irrigation liquid, and which performs safely and reliably selective separation of biological tissue such as a blood vessel or the like by ultrasonic vibration, in operation under a visual field of an endoscope which is restricted in operation has a tip section of 5/4 or 7/4 times wavelength, a forward end curved in an arcuate form, and a tip cover provided with a detachable tip top cover at a forward end, which is semi-transparent or transparent, and which has an inclined surface, to prevent irrigation liquid from scattering. The tip cover of an ultrasonic surgical knife is provided with an auxiliary cavity for a laser probe, and a spatula-like projection at the forward end of the cover. The main cavity and the auxiliary cavity for the tip are closed by an O-ring gas-tight packing or a gas-tight closure to prevent pneumoperitoneum gas within an abdomen cavity from leaking.

Abstract: A pressure differential valve connected to a refrigerating circuit piping which, when a refrigerating cycle stops, blocks the high pressure coolant from diffusing into the low pressure section. Said pressure differential valve comprises a valve body having a first inlet, a first outlet, a second inlet and a second outlet; a valve disk installed in a valve chamber between the first inlet and the first outlet to open or close the passage between the first inlet and outlet, the valve disk being urged to open by a spring; a diaphragm installed between the second inlet and the second outlet to form pressure chambers; and a check valve secured to the diaphragm and communicating to both of the pressure chambers; whereby when the check valve is closed, the diaphragm causes, through a connecting rod, the valve disk to close. Said valve disk has radially projecting guide vanes attached to the axially extending portion of the seat-contacting disk to form spaces through which coolant can flow.