Samsung Electronics Co., Ltd.

Lae-soo Park

Woon-bae Kim

Chang-woo Lee

Jee-hong Min

Kwang-Il Kim

Jeung-rak Lee

Jae-gon Lee

Gi-myung Woo

Wan-Yong Kim

Young-sik Nam

A method for forming a throughhole in an ink-jet print head of a bubble-jet system includes the steps of: forming a bubble-generator which is adjacent to a throughhole-forming region on one side of a substrate, and which includes a heater; forming a first mask layer for covering portions excluding the throughhole-forming region on a first side of the substrate; forming a second mask layer for covering portions excluding the throughhole-forming region on a second side of the substrate; forming a first well with a predetermined depth on the throughhole-forming region of the substrate not covered by the first mask layer by spraying sand under high pressure and at a high speed onto the first side of the substrate; forming a second well corresponding to the first well on the throughhole-forming region of the substrate not covered by the second mask layer by spraying sand under high pressure and at a high speed onto the second side of the substrate; forming a throughhole by overlap of the first well and the second well on the throughhole-forming region; and removing the first and second mask layers. Accordingly, a plurality of throughholes can be formed on a plurality of substrates at one time, and the time required for processing throughholes on one wafer can be reduced considerably compared to prior techniques, thereby promoting mass production. Furthermore, the size of the nozzle for spraying the sand, and consequently the size of the throughhole, is uniform and does not change. The size of the throughhole is determined by the mask layers, thereby forming a throughhole having a very uniform size with high precision.

Method for forming throughhole in ink-jet print head

An electronic expansion valve for a cooling cycle includes a valve housing having intake and exhaust holes and an orifice formed on the exhaust hole. A case is disposed on the valve housing, and a motor is disposed within the case. The motor has a drive shaft extending inside the valve housing. A guide tube is disposed inside the valve housing, the guide tube being vertically or axially movable by rotation of the drive shaft. A needle valve is provided for adjusting an opening of the orifice, the needle valve being mounted on the guide tube. A mechanism is then provided for restricting an axial or vertical movement range of the guide tube and the needle valve, the mechanism being disposed on the drive shaft and the guide tube.

Electronic expansion valve for cooling cycle

A mechanism to move reels and a tape cassette sensing switch, for use in a magnetic recorder which includes: a power generating unit installed on a position of a main chassis; a moving member combined with a bottom surface of the main chassis in such a manner that the moving member can be rectilinearly moved back and forth; a power transmitting unit for transmitting power from the power generating unit to the moving member; a supply reel driver and a take up reel driver respectively installed on the bottom surface of the main chassis in spaced apart relation from each other; reel driving gears respectively combined with and fixed to rotary shafts of the supply and the take up reel drivers; and a reel supporting unit concentrically combined with the reel driving gears on the main chassis and including thereon a supply reel and a take up reel. The reel supporting unit is rotated by a predetermined angle according to the rectilinear movements of the moving member.

Mechanism for moving a reel assembly and a tape cassette sensing switch

A magnetic recording/reproducing apparatus applicable to a small camcorder is provided, in which tape guide devices are interlocked with a single main slide member and a hard circuit board is used. Therefore, it is easy to assemble and disassemble the apparatus.

Growing community of inventors

Suwon, South Korea

Lae-soo Park