A gate device includes a base plate, a gate, and a power system for driving the gate to slide, the base plate has an opening, the gate is arranged on an inner side of the base plate, a rack is provided on an inner side of the gate in an opening-closing direction, and the power system includes a bi-directional power motor having a power output gear; a first transmission gear engaged with the power output gear and configured to drive a second transmission gear by a first transmission shaft, and the second transmission gear being engaged with the rack; and a third transmission gear engaged with the first transmission gear and configured to drive a sleeve component by a screw rod to make a reciprocation movement in a direction perpendicular to a sliding direction of the gate on a plane in parallel with the gate.

The present invention discloses a design of a single-chip push-pull bridge sensor, composed of magnetoresistive elements, utilizing on-chip permanent magnets. The permanent magnets are oriented to preset magnetization directions of free layers of adjacent sensor bridge arms so that they point to different directions with respect the same sensing direction, enabling push-pull operation. The push-pull bridge sensor of the present invention is integrated on a single chip. Additionally, an on-chip coil is disclosed to reset or calibrate the magnetization directions of the free layers of the magnetoresistive elements.

A game token tray system includes a game token tray having a dual tray structure in which a game token is stored. The game token tray system includes a double tray including a lower tray and an upper tray stacked on the lower tray to store a game token provided with an RF tag in which tag information is stored, a camera that acquires tray image data by imaging the game token stored in the upper tray, an RIFD reading device that reads the tag information from the RF tag of the game token stored in the lower tray, and a game recording device that records the tray image data and/or an image analysis result of the tray image data about the game token stored in the upper tray and records the tag information read by the RFID reading device about the game token stored in the upper tray.