Abstract: A physiological signal measurement system, a physiological signal measurement method, and a mobile device protective case are provided. The physiological signal measurement system includes a first electrode, a second electrode, a reference electrode, an impedance front-end circuit module and a dynamic signal matching module. The first electrode, the second electrode and the reference electrode are used to obtain a first sensing signal and a second sensing signal. The impedance front-end circuit module is used to detect a first impedance of the first electrode and a second impedance of the second electrode, and obtain an original differential signal according to the first sensing signal and the second sensing signal. The dynamic signal matching module is used to obtain a calibration sequence according to the first impedance, the second impedance and the original differential signal, and obtain a compensated calibration sequence according to the calibration sequence and the original differential signal.

Abstract: Disclosed are calibration techniques that can be implemented by a device that conducts biological tests. In certain embodiments, the device for testing a biological specimen includes a receiving mechanism to receive a carrier, a camera module arranged to capture imagery of the carrier, and a processor. Some examples of the processor can detect a calibration mode trigger. In calibration mode, the processor can divide the captured imagery into segments and selectively perform one or more calibration procedures for each segment. Then, the processor records a calibration result for each segment.

Abstract: A lens assembly includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens are sequentially arranged from an object side to an image side. The lens assembly satisfies the following relationships: |PVS1-S6|?0.3; |PVS7?PVS8|?|PVS11?PVS12|?1; |PVS1/PVS12|?3; PV is an error between an actual surface shape and a standard surface shape of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens. PVSn is an error of crests and troughs between an actual surface shape and a standard surface shape of the first surface to an nth surface, and n is a positive integer less than 13.

Abstract: A lens module includes a lens group and at least one coating film. The lens group includes a plurality of lenses arranged successively from an object side of the lens module to an image side of the lens module. Each lens has two effective surfaces. One effective surface is located on the object side of the lens module, and the other is located on the image side. The coating film formed on at least one of the effective surfaces. The coating film satisfies a first relationship: B1<0.5%; B2<0.35%. B1 refers to a maximum value of a reflectivity of incident light incident on the effective surfaces. B2 refers to an average value of the reflectivity of the incident light incident on the effective surfaces, a wavelength of the incident light being in a range of 490 nm to 620 nm.

Abstract: A light shield for reducing the amount of stray light reaching an image sensor includes a first surface, a second surface, an outer lateral face, and an inner lateral face. The first surface faces an object side and defines a first central opening. The second surface faces an image side and defines a second central opening communicating with the first central opening. The outer lateral face connects outer side edges of the first and second surfaces. The inner lateral face connects inner side edges of the first and second surface surfaces. A first intersection angle is defined between the second surface and a contour line of the inner lateral face connecting the first surface and the second surface, and the first intersection angle is a sharp corner.

Abstract: A lens module includes a lens group and at least one coating film. The lens group includes a plurality of lenses arranged successively from an object side of the lens module to an image side of the lens module. Each lens has two effective surfaces. One effective surface is located on the object side of the lens module, and the other is located on the image side. The coating film formed on at least one of the effective surfaces. The coating film satisfies a first relationship: B1<0.5%; B2<0.35%. B1 refers to a maximum value of a reflectivity of incident light incident on the effective surfaces. B2 refers to an average value of the reflectivity of the incident light incident on the effective surfaces, a wavelength of the incident light being in a range of 490 nm to 620 nm.

Abstract: An air particle detecting device includes a main body, a processor received in the main body, and an air particle counter received in the main body. The air particle counter is electrically coupled to the processor. The air particle counter is configured to calculate data related to a quantity of particulate matter and transmit the data to the processor. The processor is configured to calculate a concentration of PM 2.5 according to the data.

Abstract: A 3D printing pen for drawing conductive wires includes a tube, a nozzle, at least two conduits, at least one light, and a controller. The nozzle has a securing portion and a discharge portion. The securing portion is attached to the tube. The discharge portion is mounted on the securing portion. The conduits are disposed in the tube. Each conduit has a lower portion extending into the securing portion and the discharge portion of the nozzle. Different light curable materials are contained in each conduit. The light is mounted on the securing portion of the nozzle. The controller has a power unit disposed in the tube. The power unit causes the light curable materials to flow from the discharge portion of the nozzle, the light irradiates and cures the light curable materials to form a conductive wire.

Abstract: A mobile device with display screen of more than one size includes a first portion and a second portion. The first portion includes a main screen and a first gyroscope sensor. The main screen is located on a front surface of the first portion. The second portion includes an auxiliary screen and a second gyroscope sensor. The auxiliary screen is located on a front surface of the second portion. The first and second portions are pivotally connected to each other and can be folded or unfolded. The first and second gyroscope sensors can determine the folded and unfolded states of the first and second portions so as to switch the mobile device into a single screen mode of the main screen or a dual screen mode of the main and auxiliary screens.