Abstract: A heat exchanger is provided. The heat exchanger includes a configuration in which a heat transfer tube having a flat shape passes through a plurality of fins, and capable of securing drainage performance of condensed water retained on a surface of the heat transfer tube while improving a heat transfer rate, and further capable of suppressing an increase in ventilation resistance. The heat exchanger includes a heat transfer tube formed in a flat shape, and a plurality of fins, and a refrigerant flowing inside the heat transfer tube exchanges heat with air flowing between the plurality of fins. The fin includes a heat transfer expansion surface including a peak portion and a valley portion provided along an air flow direction, and a drain structure provided to overlap the heat transfer expansion surface.

Abstract: A heat exchanger and an air conditioner including the same. The heat exchanger includes a plurality of heat transfer tubes formed in a flat shape and configured to allow a refrigerant to flow in a vertical direction therein. The heat transfer tube includes a gas refrigerant region including one end connected to a refrigerant inlet port and another end disposed above the refrigerant inlet port; a two-phase refrigerant region including one end connected to the other end of the gas refrigerant region and another end disposed below a refrigerant outlet port; and a liquid refrigerant region including one end connected to the other end of the two-phase refrigerant region and another end connected to the refrigerant outlet port.

Abstract: A heat exchanger is provided. The heat exchanger includes a configuration in which a heat transfer tube having a flat shape passes through a plurality of fins, and capable of securing drainage performance of condensed water retained on a surface of the heat transfer tube while improving a heat transfer rate, and further capable of suppressing an increase in ventilation resistance. The heat exchanger includes a heat transfer tube formed in a flat shape, and a plurality of fins, and a refrigerant flowing inside the heat transfer tube exchanges heat with air flowing between the plurality of fins. The fin includes a heat transfer expansion surface including a peak portion and a valley portion provided along an air flow direction, and a drain structure provided to overlap the heat transfer expansion surface.

Abstract: A heat exchanger and an air conditioner including the same. The heat exchanger includes a plurality of heat transfer tubes formed in a flat shape and configured to allow a refrigerant to flow in a vertical direction therein. The heat transfer tube includes a gas refrigerant region including one end connected to a refrigerant inlet port and another end disposed above the refrigerant inlet port; a two-phase refrigerant region including one end connected to the other end of the gas refrigerant region and another end disposed below a refrigerant outlet port; and a liquid refrigerant region including one end connected to the other end of the two-phase refrigerant region and another end connected to the refrigerant outlet port.

Abstract: There are provided a drive device that is detachably mounted on a lens barrel making time, which is required until the position of a zoom ring is detected, uniform, a method of controlling initial processing for storing a result of initial processing in a memory, and a method of adjusting an angular position. A series of pulses are output from an encoder 45 according to the rotation of a zoom ring. A reference signal is output from a photo interrupter 40 at an intermediate position of a movable range of the zoom ring. The present position of the zoom ring is calculated from the pulses of the encoder that are generated after the rising or falling of the reference signal. Time, which is required until the position of the zoom ring is detected, is made uniform.

Abstract: A lens device, includes: a lens barrel including an operation ring provided to be rotatable about an optical axis; a drive unit including a drive part configured to rotatably drive the operation ring, the drive unit being detachably fixed to a predetermined portion on an outer circumference of the lens barrel, in which the drive unit moves in relation to the lens barrel in a direction of the optical axis to be attached to or detached from the lens barrel, and the operation ring and the drive unit are respectively provided with engaging parts, wherein, when the operation ring is at a predetermined rotation angle about the optical axis, the engaging parts being configured to be engaged with each other during the attachment or detachment of the drive unit in relation to the lens barrel to allow the attachment or detachment of the drive unit.

Abstract: There are provided a drive device that is detachably mounted on a lens barrel making time, which is required until the position of a zoom ring is detected, uniform, a method of controlling initial processing for storing a result of initial processing in a memory, and a method of adjusting an angular position. A series of pulses are output from an encoder 45 according to the rotation of a zoom ring. A reference signal is output from a photo interrupter 40 at an intermediate position of a movable range of the zoom ring. The present position of the zoom ring is calculated from the pulses of the encoder that are generated after the rising or falling of the reference signal. Time, which is required until the position of the zoom ring is detected, is made uniform.

Abstract: A lens device, includes: a lens barrel including an operation ring provided to be rotatable about an optical axis; a drive unit including a drive part configured to rotatably drive the operation ring, the drive unit being detachably fixed to a predetermined portion on an outer circumference of the lens barrel, in which the drive unit moves in relation to the lens barrel in a direction of the optical axis to be attached to or detached from the lens barrel, and the operation ring and the drive unit are respectively provided with engaging parts, wherein, when the operation ring is at a predetermined rotation angle about the optical axis, the engaging parts being configured to be engaged with each other during the attachment or detachment of the drive unit in relation to the lens barrel to allow the attachment or detachment of the drive unit.