Digital photographing apparatus and method of controlling the same

A method of controlling a digital photographing apparatus having a lens unit, an encoder sensor comprising a first sensor and a second sensor that each have an output signal that have different phases than each other, and a power supply controller to control a supply of power to the encoder sensor, the method comprising:

• controlling, using the power supply controller, the supply of power to an input of the encoder sensor so that an operation of turning on the encoder sensor to generate a detection signal and an operation of turning off the encoder sensor are repeatedly performed, the turning on the encoder sensor comprising generating the detection signal after a stabilization time delay after the encoder sensor has been turned on;
• wherein the controlling of the supply of power to the encoder sensor comprises:
• controlling the first sensor to repeatedly perform operations of turning on and turning off the first sensor,
• controlling the second sensor to repeatedly perform operations of turning on and turning off the second sensor if the lens unit is determined as having been rotated, and
• maintain an off-state of the second sensor if the lens unit is determined as not having been rotated;
• and the method further comprising:
• determining a rotational state of the lens unit from the detection signal.

A system of reducing power consumption, comprising:

• a first member, wherein a position of a portion of the first member is configured to be changed by a manual adjustment;
• a sensor configured to sense the position of the portion of the first member, wherein the sensor comprises a first sensor and a second sensor that each have an output signal that have different phases than each other;
• a hardware-based controller configured to:
• change a position of a second member in response to the position of the portion of the first member,
• control the first sensor to repeatedly turn the first sensor on and off,
• control the second sensor to repeatedly turn the second sensor on and off if determined that the first member has rotated, and
• maintain an off-state of the second sensor if determined that the first member has not rotated, and
• an encoder sensor that generates a detection signal when turned on,
• wherein the hardware-based controller is further configured to:
• detect an abnormal state transition in the detection signal, and
• reduce a time that the encoder sensor is operated in an off-state if the abnormal state transition is detected.

A non-transitory computer-readable recording medium containing instructions which, when executed by an electronic processing element, cause the electronic processing element to perform a method, the method comprising:

• determining, under a control of the electronic processing element, a position for a first member in response to a manual adjustment of a position of a portion of a second member;
• determining, under the control of the electronic processing element, a duty-cycle to provide power in an intermittent manner to an input of a sensor, configured to sense the position of the portion of the second member, to reduce power consumption of the sensor, wherein the sensor comprises a first sensor and a second sensor that each have an output signal that have different phases than each other;
• generating a detection signal when the sensor is turned on;
• detecting an abnormal state transition in the detection signal;
• and
• reducing a time that the sensor is operated in an off-state if the abnormal state transition is detected,
• wherein the determining of the duty cycle comprises:
• controlling the first sensor to repeatedly turn the first sensor on and off,
• controlling the second sensor to repeatedly turn the second sensor on and off if determined that the first member has rotated, and
• maintaining an off-state of the second sensor if determined that the first member has not rotated.