摘要:
A refrigerator has a main body. A compressor is provided in the bottom portion of the body, and a receiving box for housing electric appliances is arranged in the body above the compressor. A thermosiphon for conveying the heat from the compressor to the receiving box is provided in the body. The thermosiphon includes a heat receiving portion located in the vicinity of the compressor, an upper portion located in the vicinity of the receiving box, an advancing path extending from the heat receiving portion to the upper portion, and a returning path extending from the upper portion to the heat receiving portion. The upper portion is adhered to the body by a tape of aluminum foil, thereby having heat radiation efficiency higher than that of the advancing portion.
摘要:
A compressor included in a refrigerative cycle is disposed in a refrigerator with a rear plate and side plates. The cooling device for the compressor includes a thermo-siphon which includes a closed pipe loop disposed independent of the refrigerative cycle to cool the compressor. The thermo-siphon contains a gaseous liquid refrigerant corresponding to 60% to 80% of the inner volume of the closed pipe loop and has a heat absorbing portion immersed in an oil stored in the compressor and a heat discharging portion at least a part of which thermally contacts the rear plate or the side plates.
摘要:
According to one embodiment, an electronic device includes a printed circuit board includes a plurality of circuit parts, a conductive shield case provided on the printed circuit board, a tuner provided on the printed circuit board and inside the shield case, a first ground portion provided on the printed circuit board and outside the shield case and a second ground portion provided on the printed circuit board and inside the shield case. The first ground portion is electrically connected to the second ground portion via the shield case.
摘要:
A lighting device including a metal substrate to prevent temperature rise of LED chip is offered. The lighting device includes the metal substrate, an anode or cathode electrode of the LED chip disposed on the metal substrate, brazing materials connecting the LED chip and the metal substrate, and a groove formed in the anode or cathode electrode. Forming the groove can prevent an occurrence of a crack in the brazing materials.Also, a lighting device includes the metal substrate, an anode and cathode electrode of the LED chip disposed on the metal substrate and brazing materials connecting the LED chip and the metal substrate. Further, a slit is formed in the metal substrate between the anode and cathode electrode. Forming the slit in the metal substrate can prevent an occurrence of a crack in the brazing materials.
摘要:
In a hybrid integrated circuit device that is a circuit device of the present invention, a conductive pattern including pads is formed on a surface of a substrate. A first pad is formed to be relatively large since a heat sink is mounted thereon. A second pad is a small pad to which a chip component or a small signal transistor is fixed. In the present invention, a plated film made of nickel is formed on a surface of the first pad. Therefore, the first pad and a solder never come into contact with each other. Thus, a Cu/Sn alloy layer having poor soldering properties is not generated but a Ni/Sn alloy layer having excellent soldering properties is generated. Consequently, occurrence of sink in the melted solder is suppressed.
摘要:
A method for manufacturing a semiconductor device includes mounting a first chip over a first area of a chip mounting section of a lead frame and mounting a second chip over a second area of the chip mounting section, wherein the second area is adjacent to the first area via the slit. The chip mounting section is disposed on a flat heating jig. First pads of the first chip are connected with second pads of the second chip via first wires, respectively, and the first pads are connected with leads of the lead frame via second wires, respectively, the first chip, the second chip, the first wires and the second wires are sealed with a resin such that a part of each of the leads is exposed from the resin, and each of the leads is then separated from the lead frame.
摘要:
Provided is a simplified structure of a circuit device in which a power element generating a large amount of heat is incorporated. The circuit device according to the present invention includes: a circuit board whose surface is covered with an insulating layer; a conductive pattern formed on the surface of the insulating layer; a circuit element electrically connected to the conductive pattern; and a lead connected to a pad formed of the conductive pattern. Furthermore, a power element is fixed to the top surface of a land portion formed of a part of the lead. Accordingly, the land portion serves as a heat sink, thereby contributing to heat dissipation.
摘要:
A circuit device 10 comprises a die pad 11, bonding pads 12, a circuit element 9, affixed onto die pad 11, and an insulating resin 14, which seals die pad 11, bonding pads 12, and circuit element 9, and has a configuration wherein recessed parts 15 are formed at parts of the side surfaces of insulating resin 14, and side surface of the conductive patterns that are disposed at peripheral parts are exposed from recessed parts 15. By bonding pads 12, which are to become connecting electrodes to the exterior, being exposed at the side surfaces, fillets of a brazing material 19 are formed at the sides of the device when circuit device 10 is mounted.
摘要:
A toner for electrophotography, wherein the toner is prepared by a suspension polymerization or emulsion polymerization from a monomer composition comprising a monovinyl monomer and a coloring agent, and a filtration velocity of the toner is in the range of 0.1 to 3.0 mL/min. The filtration velocity is obtained by an evaluation method comprising following evaluation steps: (i) 15 mg of a toner is added to 5 mL of THF, and soluble component in the toner is dissolved in THF completely to prepare a sample liquid; and (ii) the sample liquid is filtrated at the temperature of 25° C. and pressure of 0.15 kgf/cm2 is applied using a filter wherein an area thereof is 4.0 cm2 and a pore size thereof is 0.45 μm to measure a filtration time wherein 1 mL of the sample liquid is passed through the filter, and a filtration velocity is determined using the filtration time by a following formula, Filtration velocity (mL/min)=1 (mL)/filtration time (min).
摘要:
In a hybrid integrated circuit device that is a circuit device of the present invention, a conductive pattern including pads is formed on a surface of a substrate. A first pad is formed to be relatively large since a heat sink is mounted thereon. A second pad is a small pad to which a chip component or a small signal transistor is fixed. In the present invention, a plated film made of nickel is formed on a surface of the first pad. Therefore, the first pad and a solder never come into contact with each other. Thus, a Cu/Sn alloy layer having poor soldering properties is not generated but a Ni/Sn alloy layer having excellent soldering properties is generated. Consequently, occurrence of sink in the melted solder is suppressed.