Abstract: The present disclosure provides a gas sensor. The gas sensor includes a substrate, a conductor layer over the substrate, wherein the conductor layer includes a conductive pattern including a plurality of openings, the openings being arranged in a repeating pattern, an insulating layer in the plurality of openings and over a top surface of the conductive pattern, wherein the conductive pattern is embedded in the insulating layer, and a gas sensing film over a portion of the insulating layer.

Abstract: A very small piezoelectric sensor capable of being mass produced includes a core, a piezoelectric layer on a surface of the core; and a conductive layer on a surface of the piezoelectric layer away from the core. The core is flexible and threadlike, the core is a first electrode of the piezoelectric sensor, and the conductive layer is a second electrode of the piezoelectric sensor. An array of such sensors allows the “skin” of a robot for example to simulate the sensitivity of hair-covered human skin. A method for making the piezoelectric sensor and an electronic device using the piezoelectric sensor are also disclosed.

Abstract: A touch feedback and sensing device includes a circuit board, a piezoelectric ceramic actuator on the circuit board; and at least one strain sensor on the circuit board. The piezoelectric ceramic actuator includes a piezoelectric ceramic block, a cathode and an anode on the piezoelectric ceramic block. Different voltages are applied to the cathode and the anode to vibrate the piezoelectric ceramic block. The circuit board vibrates with vibration of the piezoelectric ceramic block. The at least one strain sensor is configured to detect and monitor vibration of the circuit board.

Abstract: A touch feedback and sensing device includes a circuit board, a piezoelectric ceramic actuator on the circuit board; and at least one strain sensor on the circuit board. The piezoelectric ceramic actuator includes a piezoelectric ceramic block, a cathode and an anode on the piezoelectric ceramic block. Different voltages are applied to the cathode and the anode to vibrate the piezoelectric ceramic block. The circuit board vibrates with vibration of the piezoelectric ceramic block. The at least one strain sensor is configured to detect and monitor vibration of the circuit board.

Abstract: A very small piezoelectric sensor capable of being mass produced includes a core, a piezoelectric layer on a surface of the core; and a conductive layer on a surface of the piezoelectric layer away from the core. The core is flexible and threadlike, the core is a first electrode of the piezoelectric sensor, and the conductive layer is a second electrode of the piezoelectric sensor. An array of such sensors allows the “skin” of a robot for example to simulate the sensitivity of hair-covered human skin. A method for making the piezoelectric sensor and an electronic device using the piezoelectric sensor are also disclosed.

Abstract: A national-flags jigsaw puzzle globe and its jigsaw puzzle structure are provided. The globe includes a supporting frame and a rotatable cube structure connected thereof. Each surface plate of the cube structure includes a plurality of installing holes for the puzzle pieces. Each puzzle piece has a national flag picture to represent the country. The country's information, such as the country's name, may be displayed on the surface plates near to the installing hole. The backside of the puzzle piece has a protruding structure with unique profile, and the sidewall of the installing holes has the corresponding profile. Therefore, the puzzle piece only can be fitted to the corresponding installing hole. Thus, the relationship of the country's information and the national flag picture is enhanced with an entertaining and informative manner.

Abstract: A curved screen protector includes a transparent layer to protect the planar area of the curved screen. A curved frame is disposed to the and transparent layer to cover the curved area of the curved screen. Therefore, the curved screen may be well protection to significantly reduce the chance of the damage on the screen edges caused by the undesired forces.

Abstract: A spherical puzzle for learning knowledge about geography is disclosed. The spherical puzzle comprises a sphere and a plurality of puzzle pieces. The puzzle pieces can be arranged on the sphere by a user and are held to the sphere by magnetism. The puzzle pieces are formed in the shape of specific land masses and/or water masses. A base is provided for holding the sphere and allows the sphere to be rotated or turned.