Abstract:
A light emitting apparatus having a surface emitting laser including a substrate, a first reflection layer, an active layer and a second reflection layer stacked successively on the substrate, first and second electrodes formed respectively on the lower surface of the substrate and a portion of the upper surface of the second reflective layer, to emit light in the direction of the stacked layers, and a monitoring photodetector stacked on the second reflection layer to detect the amount of the emitted light from the surface emitting laser, is provided. The monitoring photodetector includes first semiconductor material layer, an absorbing layer and second semiconductor material layer stacked successively on the second reflection layer, a third electrode formed on the second semiconductor layer to output detecting signals of the monitoring photodetector, and a controlling layer formed on the bottom of the absorbing layer to intercept some of the incident light.
Abstract:
There is provided an assembly of a light source and an optical detector, each using a vertical cavity surface emitting laser (VCSEL). To control light emission of the VCSEL light source, spontaneous light emitted laterally therefrom is converted into an electrical signal. The optical detector for monitoring light is provided around the light source to supply the feedback electrical signal. The inner surface facing the light source of the optical detector is circular to absorb the spontaneous light and the outer surface thereof is polygonal having a plurality of peaks and valleys. Therefore, most of spontaneous light absorbed in the optical detector is reflected within, not penetrating the outer surface thereof, thereby extending the path of the spontaneous light in the optical detector and increasing the light intensity converted into an electrical signal.
Abstract:
The apparatus for decomposing PFCs includes an external electrode unit which is coupled to a reference voltage and which defines a flow space for the flow of the PFCs, and an internal electrode unit which is located within the flow space of the external electrode unit so as to define a reaction space between the internal electrode unit and the external electrode unit. The apparatus is also equipped with a voltage supply unit which applies an alternating voltage to the internal electrode unit which is of sufficient voltage and frequency to generate an electron beam within the reaction space which is capable of decomposing the PFCs.
Abstract:
The present invention relates to a multi-cyclone dust collector for a vacuum cleaner and dust collecting chamber. The multi-cyclone dust collector includes a first cyclone unit having a first cyclone body and a first dust collecting chamber, the first cyclone body taking dust-laden air entering through an under portion thereof and forming a first upwardly whirling air current so as to separate contaminants centrifugally from the dust-laden air, the first dust collecting chamber collecting contaminants discharged from the first cyclone body; and a second cyclone unit wrapping around at least a portion of the first dust collecting chamber, sucking semi-clean air discharged from the first cyclone unit through an under portion thereof, taking the sucked semi-clean air and forming a second upwardly whirling air current so as to separate contaminants centrifugally from the semi-clean air.
Abstract:
A fixing device for attaching and detaching a dust receptacle to and from a cyclone unit, which comprises a cyclone body and the dust receptacle and mounted in a mounting portion of a cleaner body. The fixing device comprises a dust receptacle comprising a sliding groove formed with a predetermined depth and height extended backward from a center of a bottom side of the dust receptacle that is opposite to a bottom side of the mounting portion. A guide member is disposed in the sliding groove for guiding attachment and detachment of the dust receptacle. An operation lever with a cam part having a cam projection for insertion into the cam guider, is rotated and counter-rotated to thereby move the guide member upward and downward at a height according to an eccentricity of the cam part.
Abstract:
Provided are a communication device having a built-in camera and a system and method of detecting a communication device having a built-in camera. In the system, a communication device can transmit camera existence data or particular identification data thereof, and in response thereto, a detection device can suspend a camera function of the communication device when a user with the communication device enters a security zone. In addition, the detection device can recover the camera function when the user with the communication device exits the security zone.
Abstract:
An air discharge structure for a vacuum cleaner comprises an exhaust grill through which air is exhausted from a vacuum motor chamber mounted in a vacuum cleaner body; an exhaust grill cover formed in a position corresponding to cover the exhaust grill, and to close the exhaust grill when the vacuum cleaner is not in operation, and to open the exhaust grill as a result of the force generated by back pressure of the exhaust air discharged from the exhaust grill when the vacuum cleaner is in operation; and a resilient member formed in a seating hole which is located in proximity of the exhaust grill, to return the exhaust grill cover to the closed position when the vacuum cleaner stops operation.
Abstract:
AMOS transistor with enhanced electrical characteristics and a method for manufacturing the same. In the channel region, a first impurity region is provided for adjusting a threshold voltage, a second impurity region is provided which serves as a diffusion barrier, and a third impurity region is provided for preventing a punchthrough. These regions are formed sequentially at subsequently shallower depths in the substrate. The disclosed transistor minimizes short-channel effects and punchthrough without reducing the current driving capability of the device.
Abstract:
A semiconductor device and manufacturing method thereof is disclosed in which a connection pad layer for securing a contact margin is formed on a first conductivity-type area whereas electrodes are connected directly through openings on a second conductivity-type area without the connection pad layer. In the method, an insulating layer is formed on the overall surface of a substrate. Using a mask pattern for exposing the first conductivity-type area, the insulating layer placed on an exposed portion is anisotropically etched so that the remaining insulating layer serves as an impurity-implantation preventing mask in a succeeding first conductivity-type impurity implantation step. A material layer for the connection pad layer is formed prior to the impurity-implantation step and patterned after the impurity implantation. In forming the second conductivity-type area, an additional insulating layer is formed, and using a mask pattern for exposing the second conductivity area, selectively and anisotropically etched so that the remaining insulating layer or the mask pattern for exposing the second conductivity-type area serves as an impurity-implantation preventing mask.
Abstract:
Provided are a communication device having a built-in camera and a system and method of detecting a communication device having a built-in camera. In the system, a communication device can transmit camera existence data or particular identification data thereof, and in response thereto, a detection device can suspend a camera function of the communication device when a user with the communication device enters a security zone. In addition, the detection device can recover the camera function when the user with the communication device exits the security zone.