摘要:
PROBLEM TO BE SOLVED: To provide a physical quantity detection device having a configuration in which inclination detectors are hardly affected by heat.SOLUTION: A physical quantity detection device 100 includes: a metal block (holding part) 30 having six faces; inclination detectors (physical quantity detector) 40 arranged on the selected three faces among the six faces; an electronic component 60 electrically connected to inclination detectors 40; and a heat insulating material (heat transfer reduction part) 20 which is disposed between the metal block 30 and the electronic component 60, and has heat conductivity smaller than that of the metal block 30.
摘要:
PROBLEM TO BE SOLVED: To provide a physical quantity detection device capable of suppressing transmission of stress to a physical quantity detection element.SOLUTION: A physical quantity detection device 100 includes: a base part 10; a movable part 13 supported on the base part 10 through a joint part 12 and configured to displace according to a physical quantity change; a physical quantity detection element 40 bridging between the base part 10 and the movable part 13; and mass parts 50, 52 fixed to the movable part 13. The movable part 13 includes: a first fixation part 14 to which the physical quantity detection element 40 is fixed; second fixation parts 16a, 16b to which the mass parts 50, 52 are fixed; and notch parts 20a, 20b being separated from the joint part 12 and each having a notched form which starts from a side face 13e of the movable part 13 and reaches an intersection of line segments L1, L2 connecting the first fixation part 14 and the second fixation parts 16a, 16b, respectively.
摘要:
An acceleration sensor is formed using an etched layer sandwiched between first and second substrates. In this case, a structure including a movable portion which is displaceable in the thickness direction of the substrates, and a support frame are formed in the etched layer. In addition, first and second fixed electrodes are formed on the first and second substrates, respectively, at a position facing the movable portion. Further, a remaining sacrificial layer is provided on the substrate by leaving a portion of a second sacrificial layer when a first sacrificial layer is entirely etched away. Therefore, when the first sacrificial layer is etched away, corrosion of the structure and the support beams is prevented because the second sacrificial layer is preferentially corroded as compared to the structure.
摘要:
PROBLEM TO BE SOLVED: To provide an external force detector capable of precisely and easily detecting an external force applied to a piezoelectric piece.SOLUTION: A quartz piece 2 is supported in a cantilever manner in a case 1. The quartz piece 2 has excitation electrodes 31 and 41 each formed on an upper surface and a lower surface at, for example, a central area. The quartz piece 2 has a movable electrode 5 formed in a front end portion at the lower surface side, which is connected to an excitation electrode 41 located at the lower surface side via an extraction electrode 42. The case 1 has a fixed electrode 6 formed on the bottom opposite the movable electrode 5. The excitation electrode 31 at the upper surface side and the fixed electrode 6 are connected to an oscillation circuit 14. When the quartz piece 2 deflects due to an external force applied thereto, the capacitance between the movable electrode 5 and the fixed electrode 6 varies. The variation of the capacitance is read as a variation of oscillation frequency of the quartz piece.