摘要:
An optical pickup includes at least two vertical cavity surface emitting lasers (VCSEL) disposed adjacent to each other on the same substrate for emitting light having different emission angles, a light path converter for converting the travel path of incident light, an objective lens for focusing incident light to form an optical spot on an optical recording medium, and an optical detector for receiving light which is reflected by the optical recording medium and passed through the objective lens and the light path converter. The optical pickup selectively drives one of the VCSELs so that disks of different thicknesses can be compatibly adopted, and high efficiency of light can be secured.
摘要:
A connection assembly of a computer and a port replicator for distributing a plurality of signals generated from the computer to each of a plurality of peripheral devices. The connection assembly includes a first optical connecter installed at the computer for transmitting input signals using light, a second optical connecter installed at the port replicator to correspond to the first optical connecter for transmitting input signals using light, and a portion for coupling the first and second optical connecters to communicate with each other. Thus, since the first and second light-receiving/emitting units are disposed to be separated a predetermined distance from each other and exchange information signals, the reliability with respect to connection can be maintained when the port replicator is repeatedly connected and disconnected to and from the computer. Also, EMI can be reduced by replacing the pin and pin holder with the first and second light-receiving/emitting units. Further, the replacement of the pin and pin holder with the optical connecter, which is smaller in volume and lighter, makes the entire connection assembly lightweight.
摘要:
A bidirectional light transmitting and receiving device includes a first light transceiver having a first light emitter and a first light receiver for receiving a light beam entering around the first light emitter, and a second light transceiver having a second light emitter and a second light receiver for receiving a light beam entering around the second light emitter, and signal transmission and reception between the corresponding first and second light device units is achieved through the same optical passageway. The bidirectional light transmitting and receiving device has a simple configuration because optical signal transmission and reception are achieved through the single optical passageway. The number of optical fibers required for the signal transmission and reception in the device is reduced by half, and thus the manufacturing cost also becomes lower.
摘要:
An assembly structure for a display of an electronic appliance is provided. The electronic appliance includes a main body and a display for displaying an image according to an image signal input from the main body so as to facilitate the attachment and detachment of the display to and from the main body. The assembly structure includes a fitting device formed at the main body and the display. The fitting device has a fitting member which slidably fits into a fitting hole. An optical connector is provided between the main body and the display to be attached to the main body for transferring an image signal using light beams for the display.
摘要:
Disclosed is an optical connector module for being connected between first and second devices for receiving and/or outputting electrical information signals, and being capable of converting input electrical signals to optical signals, transmitting the converted signals and again converting the transmitted optical information signals into electrical information signals. The optical connector module comprises: a first connector module for being connected to the first device while being electrically detachable and for converting the electrical signals from the first device into optical information signals; an optical fiber cable, one end of which is disposed to face the first connector module for transmitting the input optical information signal to the other end; and a second connector module for being connected to the second device while being electrically detachable and for converting the optical information signals transmitted through the optical fiber cable into electrical information signals and applying the converted signal to the second device.
摘要:
A vertical cavity surface emitting laser (VCSEL) is provided which has a substrate, a first reflector layer formed on the substrate, an active layer formed on the first reflector layer, a second reflector layer formed on the active layer, and an electrode layer formed on the second reflector layer and having a cavity for emitting light from the second reflector layer. Laser light is generated in the active layer between the first and second reflective layers and is emitted through the second reflective layer at the cavity. The first and second reflective layers are each formed of semiconductor material containing impurities, such that the impurities in the first reflective layer are of an opposite type to the impurities in the second reflective layer. The electrode layer has a metal layer having a high electrical conductivity and a conductive auxiliary reflector layer formed between the metal layer and the second reflective layer. The auxiliary reflector layer has a reflectivity which is lower than the reflectivities of either of the first or second reflector layers.
摘要:
A hologram optical pick-up device using a first and second laser sources emit laser beams having different wavelengths, which are then focused by an objective lens on a disc, and reflected at a surface of the disc. The reflected laser beams are diffracted by a first hologram or a second hologram, and then received by a first photo detector or a second photo detector. Accordingly, a laser beam having an adjustable wavelength according to a thickness and a recording surface of the disc is emitted by the first laser source or the second laser source in order compensate the aberration of the laser beam due to the thickness of the disc. Thereby, the same hologram optical pick-up device can reproduce data from discs having different recording surfaces without loss of data. Also, the hologram optical pick-up can record and reproduce data on/from any disc with an increased efficiency of the laser beam.
摘要:
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.
摘要:
An optical pickup is provided which detects information contained in an optical disk. The optical disk includes a light source, a hologram device, an objective lens, a photodetector, and a single chip. The light source is formed of a first vertical cavity surface-emitting laser (VCSEL) diode and emits a light beam. The hologram device converts the light beam emitted from said light source into a polarized parallel light beam and diffracts a reflected parallel light beam reflected from said optical disk to produce a diffracted beam. The objective lens focuses the polarized parallel light beam on said optical disk and converts a corresponding reflected beam into the parallel reflected beam. The photodetector is formed of a second VCSEL diode and detects various characteristics of the diffracted beam. Finally, the light source and the photodetector are integrated on the chip. As a result of the configuration above, the light source emits a laser beam which has a small astigmatism and does not lose its intensity as it propagates through the optical head.
摘要:
A vertical cavity surface emitting laser (VCSEL) device with an integral photodetector structure has improved intensity control characteristics. A laser optical source of the VCSEL emits light upward through a cavity formed in an upper electrode. A monitoring photodetector is formed below the laser optical source to receive light transmitted from the source downward. The intensity of the light transmitted downward from the optical source is proportional to the intensity of the light emitted upward through the cavity. Thus the detection signal provided by the photodetector sensing the downward transmitted light may be used for precise control of the driving voltage applied to the optical source. Because to the proportionality between the upward and downward emitted light, this control arrangement allows for improved control of emitted intensity of the VCSEL. An optical pickup apparatus adopting the improved VCSEL is also disclosed. For the optical pickup device, the VCSEL is enclosed in a housing having a window for allowing transmission of emitted light from the VCSEL without alteration of the direction of propagation. An optical converging means (a lens) focusses the emitted light onto an optical recording medium, which reflects the light back to the housing via the lens. When the light reflected from the recording medium passes back through the window, the optical path of the reflected light is changes so as to cause the light to impinge upon a photodetector. The window may be embodied as a hologram device.