Abstract: Disclosed are a heart rate detection system and a wearable device using the same. The heart rate detection system includes a light emitting unit, a light sensor and a processor. The light emitting unit emits a light to a human body. The light sensor senses a reflected light of the light and accordingly generates a first electric signal. The processor calculates the low-frequency noise signal and the high-frequency noise signal of the first electric signal, and removes them. After that, the processor executes a peak detection with respect to the first electric signal to calculate peak values of the first electric signal, and calculate a heart rate based on the time intervals among the peak values.

Abstract: Disclosed are a heart rate detection system and a wearable device using the same. The heart rate detection system includes a light emitting unit, a light sensor and a processor. The light emitting unit emits a light to a human body. The light sensor senses a reflected light of the light and accordingly generates a first electric signal. The processor calculates the low-frequency noise signal and the high-frequency noise signal of the first electric signal, and removes them. After that, the processor executes a peak detection with respect to the first electric signal to calculate peak values of the first electric signal, and calculate a heart rate based on the time intervals among the peak values.

Abstract: A lens structure of safety glasses consists of a lens part, and a warning sticker; the lens part consists of a main body, and a rim formed on a border of the main body; the rim has a strip-shaped recess on an upper portion, extending along an upper border thereof; the warning sticker is nontoxic, and contains no harmful substance, and it is stuck on the strip-shaped recess of the rim therefore the warning sticker won't stick out from the rim, and it is impossible for the warning sticker to be subjected to pulling force and fall off.

Abstract: A lens structure of safety glasses consists of a lens part, and a warning sticker; the lens part consists of a main body, and a rim formed on a border of the main body; the rim has a strip-shaped recess on an upper portion, extending along an upper border thereof; the warning sticker is nontoxic, and contains no harmful substance, and it is stuck on the strip-shaped recess of the rim therefore the warning sticker won't stick out from the rim, and it is impossible for the warning sticker to be subjected to pulling force and fall off.