Patent ID: 7548306
Filing Date: 2009-06-16
Classification: G01D

Abstract:
1. An optical encoder for detecting a speed of a moving member, comprising: a sensor module including: a shade member having a shading pattern, which has a light shielding portion and a light transmitting portion and which is located between the light emitting member and the light receiving member to block the light, wherein one of the sensor module and the shade member moves together with the moving member so that the sensor module detects the speed of the moving member; and a first support configured to support the sensor module, including: wherein the sensor module is attached to the first support by being moved in the second direction while the at least one boss is guided by the guide groove, and wherein the at least one recessed portion has a depth in the first direction greater than a height of the at least one boss, and at least a portion of the guide groove adjacent to the recessed portion has a depth in the first direction less than the height of the at least one boss.