Abstract: A scan mechanism and a scan module are provided. The scan mechanism adapted to be used in a scan module includes a rack and a scan unit. The rack has an engaging surface, a bottom surface and a plurality of teeth disposed on the engaging surface. Each of the teeth comprises a top end, wherein the distance between the centers of any two adjacent top ends is W, the shortest distance from the top end of each tooth to the bottom surface of the rack is D, and W/D is from 0.56 to 0.79. The scan unit includes a gear engaged with the teeth of the rack and adapted to roll along the engaging surface of the rack, wherein the scan unit is slidably disposed on the rack through the gear.

Abstract: A scan mechanism and a scan module are provided. The scan mechanism adapted to be used in a scan module includes a rack and a scan unit. The rack has an engaging surface, a bottom surface and a plurality of teeth disposed on the engaging surface. Each of the teeth comprises a top end, wherein the distance between the centers of any two adjacent top ends is W, the shortest distance from the top end of each tooth to the bottom surface of the rack is D, and W/D is from 0.56 to 0.79. The scan unit includes a gear engaged with the teeth of the rack and adapted to roll along the engaging surface of the rack, wherein the scan unit is slidably disposed on the rack through the gear.

Abstract: A gear assembly including a driving gear and a driven gear and an electronic device are provided. The driving gear includes a pawl pivoted on a first surface and an elastic member disposed in a slot of the driving gear. The driven gear includes a ratchet disposed on a second surface facing the first surface. When the driving gear rotates with a driving speed along a driving direction, a centrifugal force is generated to drive the pawl moving to a clutching position to be engaged with the ratchet and drives the driven gear rotating with the driving gear. When the driving gear rotates with a nominal speed slower than the driving speed along a direction opposite to the driving direction, the engagement between the pawl and the ratchet is released, and the pawl is back to a nominal position so the driven gear does not rotate with the driving gear.

Abstract: A gear assembly including a driving gear and a driven gear and an electronic device are provided. The driving gear includes a pawl pivoted on a first surface and an elastic member disposed in a slot of the driving gear. The driven gear includes a ratchet disposed on a second surface facing the first surface. When the driving gear rotates with a driving speed along a driving direction, a centrifugal force is generated to drive the pawl moving to a clutching position to be engaged with the ratchet and drives the driven gear rotating with the driving gear. When the driving gear rotates with a nominal speed slower than the driving speed along a direction opposite to the driving direction, the engagement between the pawl and the ratchet is released, and the pawl is back to a nominal position so the driven gear does not rotate with the driving gear.

Abstract: A gear clutch assembly and an electronic device are provided. The gear clutch assembly comprises a pivot, a driving gear engaged with the pivot and adapted to rotate along the pivot, and a driven gear disposed on the driving gear. The driving gear comprises a first surface, a ratchet integrally formed with the driving gear comprising a plurality of teeth disposed on the first surface. The driving gear comprises a second surface facing the first surface, and a pawl integrally formed with the driven gear on the second surface. When the driving gear rotates in a driving direction, one of the teeth is engaged with the pawl and drives the driven gear to rotates with the driving gear. When the driving gear rotates in an opposite direction, every tooth pushes up and slides under the pawl so the driven gear does not rotate along with the driving gear.

Abstract: A gear clutch assembly and an electronic device are provided. The gear clutch assembly comprises a pivot, a driving gear engaged with the pivot and adapted to rotate along the pivot, and a driven gear disposed on the driving gear. The driving gear comprises a first surface, a ratchet integrally formed with the driving gear comprising a plurality of teeth disposed on the first surface. The driving gear comprises a second surface facing the first surface, and a pawl integrally formed with the driven gear on the second surface. When the driving gear rotates in a driving direction, one of the teeth is engaged with the pawl and drives the driven gear to rotates with the driving gear. When the driving gear rotates in an opposite direction, every tooth pushes up and slides under the pawl so the driven gear does not rotate along with the driving gear.