Patent ID: 7567366
Filing Date: 2009-07-28
Classification: H04N

Abstract:
1. A system having a power saving mode comprising: a body provided with an original table having a surface for putting an original; an original cover coupled to the original table so that the original cover can be opened and closed to cover at least the surface of the original table; a light source that emits a beam; a power source that supplies power to the light source; an external light detector that detects external light incident on the body via the surface and outputs a detection signal; a judging unit that judges whether a value of intensity of the external light is changed from a value being smaller than a threshold value to a value being larger than the threshold value and whether the value of the intensity of the external light is changed from a value being larger than the threshold value to a value being smaller than the threshold value, the threshold value being a value between a value of the intensity of the external light in a state that the original having a predetermined size is put on the original table and a value of the intensity of the external light in a state that the original is not put on the original table; and a power source controller that controls the power source so that the power saving mode is released, if the judging unit judges that the value of the intensity of the external light is changed from the value being larger than the threshold value to the value being smaller than the threshold value, when the intensity of the external light is unchanged in a predetermined time and the power saving mode is turned on, and that controls the power source so that the power saving mode is maintained, if the judging unit judges that the value of the intensity of the external light is unchanged from the value being smaller than the threshold value to the value being larger than the threshold value, when the intensity of the external light increases and a state of the original cover is changed.