Abstract: In a dryer, humidity of supply air in a supply path of a heat pump dryer unit is directly detected by a first humidity detection sensor, and humidity of exhaust air in a discharge path is directly detected by a second humidity detection sensor. The first and second humidity detection sensors are collectively installed at one place, and a first conduit or a second conduit that guides the supply air or the exhaust air to a position of the corresponding sensor is provided. The sensors may be collectively disposed at one place in the supply path or the discharge path. This facilitates mounting of the sensor and saves a mounting space. Because environment temperatures of the two humidity sensors can be regarded as equal to each other when using relative humidity sensors, temperature detection for conversion into absolute humidity can be performed at one place.

Abstract: In a dryer, humidity of supply air in a supply path of a heat pump dryer unit is directly detected by a first humidity detection sensor, and humidity of exhaust air in a discharge path is directly detected by a second humidity detection sensor. The first and second humidity detection sensors are collectively installed at one place, and a first conduit or a second conduit that guides the supply air or the exhaust air to a position of the corresponding sensor is provided. The sensors may be collectively disposed at one place in the supply path or the discharge path. This facilitates mounting of the sensor and saves a mounting space. Because environment temperatures of the two humidity sensors can be regarded as equal to each other when using relative humidity sensors, temperature detection for conversion into absolute humidity can be performed at one place.

Abstract: An optical transmission device capable of accommodating superfluous lengths of optical fiber cables in a small space, and facilitating the workability for the operator and the maintenance of the device, is provided. An optical transmission device 10 includes a body 12 with an optical fiber cable accommodating structure attachment member 16 on a back surface of the body, drums 28 of thin disk shapes for winding the superfluous lengths of the optical fiber cables therearound, drum holders 30 for rotatably and detachably supporting the drums, and slide structures 32 for supporting the drum holder 30 so that the drum holders can move toward and away from the body 12. The drums 28 are arranged so that rotation axes of the drum extend horizontally and parallel to the back surface of the body 12.

Abstract: A line terminating device including a housing having first and second openings and a main printed wiring board vertically mounted in a front end portion of the housing. A first optical module for performing conversion between an optical signal and an electrical signal, a WDM module, and electronic components are mounted on the main printed wiring board. The line terminating device further includes an extension electronic circuit package inserted from the first opening into the housing and a power supply package inserted from the second opening into the housing. A second optical module for performing conversion between an optical signal and an electrical signal is mounted on the extension electronic circuit package. An extra optical cable length winding drum is mounted on an upper surface of the housing. An extra length of a subscriber optical cable is wound around the drum, and an extra length of a terminal optical cable connected to a terminal device is also wound around the drum.

Abstract: A device for preventing laser beam leakage, which excludes a danger that a laser beam emitted from a laser source directly attacks eyes of an operator when an external connector is connected to or disconnected from an internal connector, aiming at being inexpensive and excellent in operability, and having a high safety. When the external connector has been removed from the optical transmission apparatus, a pair of movable shield plates are constantly urged in respective directions for closing a receiving opening of the apparatus to bring joining portions of the movable shield plates into close contact with each other, thereby preventing dust from entering the inside of the apparatus and the laser beam from being leaked.

Abstract: A structure for fixing an optical cable holding box to a printed circuit board whereby the fixed position of the optical cable holding box can be changed at will and occurrence of warping in the printed circuit board can be effectively prevented. A pair of extended first metal plates having a plurality of screw holes formed therein at equal spaces are fixed to the printed circuit board in the vicinity of its upper and lower edge portions along the upper and lower edges. A pair of vertically extended second metal plates having a plurality of screw holes formed therein at equal spaces are securely fixed to the pair of first metal plates with screws such that they are stretched between the first metal plates and spaced apart a predetermined distance from each other. Thereupon, the optical cable holding box is securely fixed with screws to the pair of second metal plates in a desired position.