摘要:
An aspect of the present invention features a method for manufacturing a substrate having a cavity. The method can comprises: (a) forming an upper layer circuit on an upper seed layer; (b) laminating a dry film on a portion of the-upper seed layer where a cavity is to be formed; (c) fabricating an upper outer layer by forming an insulation layer on top of the upper seed layer and on top and sides of the upper layer circuit; (d) stacking the upper outer layer on one side of a core layer where an internal circuit is formed; (e) removing the upper seed layer; and (f) forming the cavity by removing the dry film. The method for manufacturing a substrate with a cavity according to the present invention can reduce the total thickness of the substrate while the thickness of an insulation layer remains the same, by forming the insulation layer on sides of an external circuit.
摘要:
A fluxgate sensor is integrated in a printed circuit board. The fluxgate sensor has two bar-type (or rectangular-ring shaped) soft magnetic cores to form a closed magnetic path on a printed circuit board and an excitation coil in the form of a metal film is wound around the two bar-type soft magnetic cores either in a united structure that winds the two bar-type soft magnetic cores altogether, or in a separated structure that winds the two bar-type soft magnetic cores respectively, both in a pattern of number ‘8’. A pick-up coil is mounted on the excitation coil, either winding the two bars altogether, or respectively, in a solenoid pattern. The fluxgate sensor integrated in the printed circuit board can be mass-produced at a cheap manufacturing cost. The fluxgate sensor also can be made compact-sized, and at the same time, is capable of forming a closed-magnetic path. As a result, flux leakage is minimized, and the fluxgate sensor has a high sensitivity as it detects the magnetic field through a variable driving.
摘要:
A fluxgate sensor is integrated in a printed circuit board. The fluxgate sensor has two bar-type(or rectangular-ring shaped) soft magnetic cores to form a closed magnetic path on a printed circuit board and an excitation coil in the form of a metal film is wound around the two bar-type soft magnetic cores either in a united structure that winds the two bar-type soft magnetic cores altogether, or in a separated structure that winds the two bar-type soft magnetic cores respectively, both in a pattern of number ‘8’. A pick-up coil is mounted on the excitation coil, either winding the two bars altogether, or respectively, in a solenoid pattern. The fluxgate sensor integrated in the printed circuit board can be mass-produced at a cheap manufacturing cost. The fluxgate sensor also can be made compact-sized, and at the same time, is capable of forming a closed-magnetic path. As a result, flux leakage is minimized, and the fluxgate sensor has a high sensitivity as it detects the magnetic field through a variable driving.
摘要:
A fluxgate sensor integrated in a printed circuit board. The fluxgate sensor has soft magnetic cores having a lower core and an upper core mounted on the lower core, for forming a closed magnetic path on a printed circuit board, an excitation coil formed as a metal film, alternately winding the upper and the lower soft magnetic cores substantially in a number ‘8’ pattern, and a pick-up coil formed as a metal film, having a structure of winding the upper and the lower soft magnetic cores substantially in a solenoid pattern, the pick-up coil being placed on the same plane as an external contour of the excitation coil.
摘要:
Disclosed are a method for preparing a high performance BGA board and a jig applicable to the method. The method comprises pre-bonding an adhesive to a BGA board laminated structure or a heatsink by use of a jig; and main-bonding the BGA board laminated structure or the heatsink to which the adhesive is previously stuck in the pre-bonding step to the heatsink or the BGA board laminated structure, respectively, by use of a jig. A high performance BGA board can be prepared by use of an individual heatsink and a strip-type jig without a strip-type heatsink, and in which the Ni-plated side of the heatsink can be prevented from being contaminated.
摘要:
A weak-magnetic field sensor using printed circuit board manufacturing technique and a method of manufacturing the same which detects earth magnetism to obtain positional information is disclosed. The sensor comprises a magnetic layer patterned in a certain shape; a first stacked board stacked on a lower surface of the magnetic layer and formed with a first driving pattern; a second stacked board stacked on an upper surface of the magnetic layer and formed with a second driving pattern, the first and second driving patterns being electrically connected to each other; a third lower stacked board stacked on a lower surface of the first stacked board and formed with a first pickup pattern; and a third upper stacked board stacked on an upper surface of the second stacked board and formed with a second pickup pattern, the third lower and upper stacked boards being electrically connected to each other.