Abstract:
The invention mainly concerns a capacitive device comprising at least first (2) and second (4) combs, respectively provided with interdigital fingers, adapted to be mobile relative to each other depending on the closing-spacing apart of the axes of the fingers, at least one finger of the first comb (2) including a surface opposite a surface of a finger of the second comb (4). The invention is characterized in that the axis of the finger of the first comb and the axis of the finger of the second comb are inclined relative to a plane orthogonal to the first direction (X) of displacement of the combs, the plane being defined by second (Y) and third (Z) directions perpendicular to the direction (X), and mutually perpendicular.
Abstract in simplified Chinese:本案关于一种侧壁保护之选择性蚀刻方法,其系包含下列步骤:(a)提供一基板;(b)形成一第一遮罩层于该基板上;(c)形成一第二遮罩层于该第一遮罩层上;(d)形成一光阻层于该第二遮罩层上,而于基板上形成复数个蚀刻窗;(e)进行第一次蚀刻,以使该复数个蚀刻窗向下延伸至部分该基板;(f)进行第二次蚀刻以移除该光阻层,并向下蚀刻该基板以形成不同深度之深槽结构;(g)形成一侧壁补强结构于不同深度之深槽结构的周边;(h)进行第三次蚀刻以移除第二遮罩层,并去除底部之该侧壁补强结构以形成一下结构;以及(i)进行侧向蚀刻,借以释放一上结构。
Abstract:
The MEMS sensor of the invention has movable and fixed components for measuring acceleration in a rotational mode in a direction in-plane perpendicular to spring axis. The components include an element frame, a substrate, a proof-mass a spring connected to the proof-mass and to the substrate, and comb electrodes. The MEMS sensor is mainly characterized by an arrangement of the components causing an inherent sensitivity for measuring accelerations in a range covering longitudinal and transversal accelerations. One or more of the components are tilted compared to the element frame. The semiconductor package of the invention comprises at least one MEMS sensor.
Abstract:
Dispositif à élément mobile (13) s'étendant suivant un plan donné comportant au moins une première (3), une deuxième (10) et une troisième (12) couches s'étendant dans des plans parallèles au plan donné, la première couche (3) formant un support, la deuxième couche (10) comportant tout ou partie de l'élément mobile (13) et des moyens de suspension (11) de l'élément mobile (13) par rapport au support et la troisième couche (12) comprenant tout ou partie des moyens capacitifs dont la capacité varie en fonction de la position relative de l'élément mobile (13) par rapport au support (3), lesdits moyens capacitifs comportant au moins une électrode mobile (14) solidaire d'une des faces de l'élément mobile (13) parallèle au plan donné, et au moins une électrode fixe (16) par rapport au support (3), les électrodes fixe et mobile étant disposées au moins en partie dans un même plan parallèle au plan donné et au moins en partie au-dessus et/ou en dessous de l'élément mobile (13).
Abstract:
Methods of measuring displacement of a movable mass in a microelectro- mechanical system (MEMS) include driving the mass against two displacement-stopping surfaces and measuring corresponding differential capacitances of sensing capacitors such as combs. A MEMS device having displacement-stopping surfaces is described. Such a MEMS device can be used in a method of measuring properties of an atomic force microscope (AFM) having a cantilever and a deflection sensor, or in a temperature sensor having a displacement-sensing unit for sensing a movable mass permitted to vibrate along a displacement axis. A motion-measuring device can include pairs of accelerometers and gyroscopes driven 90° out of phase.
Abstract:
The displacement amount monitoring electrode structure according to the present invention is for maintaining the amplitude of the detection mass at a constant target amplitude even when the relative relationship between a fixed electrode and a movable electrode changes, and includes a fixed electrode and a movable electrode each having a comb-teeth shape including a base part and electrode fingers extending from the base part in a predetermined axis direction parallel to a substrate, the fixed electrode and the movable electrode facing each other such that the electrode fingers of the fixed electrode and the electrode fingers of the movable electrode are meshed together, the fixed electrode being fixed to the substrate and the movable electrode being able to be displaced in the predetermined axis direction, wherein the displacement amount monitoring electrode structure monitors a displacement amount of a detection mass to be driven at a target amplitude based on a change amount of a capacitance between the fixed electrode and the movable electrode, wherein a change sensitivity of the change amount of the capacitance with respect to a displacement amount of the movable electrode in the predetermined axis direction, becomes larger after the displacement of the movable electrode in the predetermined axis direction reaches a target displacement amount corresponding to the target amplitude of the detection mass, compared to before the displacement of the movable electrode reaches the target displacement amount.