Abstract: A disk cartridge including a lower case member in which a space portion to receive an optical disk is formed; an upper case member, joined to the lower case member, an opening portion to allow a reading/recording device to obtain access to the optical disk; a multi-shutter member, including shutters, installed at the lower case member to be able to slide, and to allow the opening portion to be exposed to the outside when the multiple-shutter member is moved in a direction of the insertion direction of the disk cartridge into a disk drive, such that the shutters overlap each other; and a locking member, installed at the lower case member, to fix the multiple-shutter member to the lower case member so that the multiple-shutter member cannot move arbitrarily.

Abstract: A disc cartridge and a disc drive apparatus. The disc cartridge includes an upper case and a lower case which form an internal space to accommodate a disc, and a pair of elastic protrusions formed at both sidewalls of the lower case and are elastically biased toward the internal space so that ends of the elastic protrusions support the disc. Surfaces are formed at the ends to slope toward the internal space so that the disc is located in an upper portion of the internal space and the pair of elastic protrusions support the disc and the disc descends on the surfaces when the pair of elastic protrusions are opened and the disc is then located in a lower portion of the internal space.

Abstract: An optical pickup apparatus having compatibility with a recodable compact disk (CD-R) and a digital video disk (DVD), which uses a wavelength of one of a first light beam and a second light beam according to the recording medium to be used. In the optical pickup apparatus, laser light sources emit a first light beam having a relatively shorter wavelength for the. DVD and a second light beam having a longer wavelength for the CD-R, respectively. An objective lens has a predetermined focal length in accordance with the position of an information recording surface in the DVD. An optical path control unit controls the path of light beams so that the light beam emitted from one of the laser light sources is directed to the objective lens and the light output from the objective lens is directed to the optical detection unit.

Abstract: An optical pickup apparatus having compatibility with a recodable compact disk (CD-R) and a digital video disk (DVD), which uses a wavelength of one of a first light beam and a second light beam according to the recording medium to be used. In the optical pickup apparatus, laser light sources emit a first light beam having a relatively shorter wavelength for the DVD and a second light beam having a longer wavelength for the CD-R, respectively. An objective lens has a predetermined focal length in accordance with the position of an information recording surface in the DVD. An optical path control unit controls the path of light beams so that the light beam emitted from one of the laser light sources is directed to the objective lens and the light output from the objective lens is directed to the optical detection unit.

Abstract: In a slim type optical disc drive, an optical pickup unit and an optical pickup transport assembly are installed on a main base disposed in a housing having a lower case and an upper case. A spindle motor is mounted on a tray so as to slide in and out of the housing. A spindle motor printed circuit board is mounted on the tray, and a main printed circuit board is fixed to the lower case. A flexible printed circuit connects the spindle motor and main printed circuits boards. The tray includes a table which supports the spindle motor, and side frame bars located at sides of the tray and spaced apart from the table. A pair of guide ribs are arranged in the housing to guide the movement of the table. In the slim type optical disc drive, only the spindle motor is disposed on the tray.

Abstract: A recording/reproducing apparatus includes an optical pickup device having an optical phase plate which is compatible with optical recording mediums having different thicknesses, and an optical signal processing device processes information read from the optical recording mediums and processes information to be recorded thereon using the optical pickup device.

Abstract: An optical pickup apparatus having compatibility with a recodable compact disk (CD-R) and a digital video disk (DVD), which uses a wavelength of one of a first light beam and a second light beam according to the recording medium to be used. In the optical pickup apparatus, laser light sources emit a first light beam having a relatively shorter wavelength for the DVD and a second light beam having a longer wavelength for the CD-R, respectively. An objective lens has a predetermined focal length in accordance with the position of an information recording surface in the DVD. An optical path control unit controls the path of light beams so that the light beam emitted from one of the laser light sources is directed to the objective lens and the light output from the objective lens is directed to the optical detection unit.

Abstract: An optical pickup apparatus having compatibility with a recodable compact disk (CD-R) and a digital video disk (DVD), which uses a wavelength of one of a first light beam and a second light beam according to the recording medium to be used. In the optical pickup apparatus, laser light sources emit a first light beam having a relatively shorter wavelength for the DVD and a second light beam having a longer wavelength for the CD-R, respectively. An objective lens has a predetermined focal length in accordance with the position of an information recording surface in the DVD. An optical path control unit controls the path of light beams so that the light beam emitted from one of the laser light sources is directed to the objective lens and the light output from the objective lens is directed to the optical detection unit.

Abstract: An optical pickup apparatus having compatibility with a recodable compact disk (CD-R) and a digital video disk (DVD), which uses a wavelength of one of a first light beam and a second light beam according to the recording medium to be used. In the optical pickup apparatus, laser light sources emit a first light beam having a relatively shorter wavelength for the DVD and a second light beam having a longer wavelength for the CD-R, respectively. An objective lens has a predetermined focal length in accordance with the position of an information recording surface in the DVD. An optical path control unit controls the path of light beams so that the light beam emitted from one of the laser light sources is directed to the objective lens and the light output from the objective lens is directed to the optical detection unit.

Abstract: The present invention relates to a structure of processor having a plurality of main processors and sub processors, and a method for sharing the sub processors, wherein a method is used for preserving a state of a register file by using a shadow register file when main processor inputs an instruction of the sub processor in case that an exceptional situation happens under processing of an instruction of sub processor and for rolling back thereafter the preserved state in case there is an information of occurrence of the exceptional situation from the sub processor. Also, in order to solve a problem that cache efficiency is reduced due to the use of a first cache which is relatively small and frequently used, there is suggested a first cache bypassing function. Further, in order to solve a problem that its processing speed is reduced when the main processor transfers instructions in sub processor, it is possible to improve the processors' parallelism and its efficiency by providing an extra register file.

Abstract: An optical pickup capable of compatibly adopting disks of different formats which are placed in an optical player includes a first optical source for emitting light having a predetermined wavelength, a second optical source for emitting light having a wavelength different from that of light emitted from the first optical source, an objective lens for focusing light emitted from the respective first and second optical sources on a recording medium placed in the optical player, a light path changing unit disposed on a light path between the first and second optical sources and the objective lens for changing the traveling path of incident light, a first optical detector for receiving light emitted from the first optical source and is incident via the recording medium and the light path changing unit, and a second optical detector for receiving light emitted from the second optical source and is incident via the recording medium and the light path changing unit.

Abstract: A low pressure transducer is disclosed which utilizes a stainless steel foil diaphragm. An electrically conductive layer is deposited onto a non-conductive planar disk to form one plate of a capacitor. An epoxy ring is silk-screened onto the non-conductive plate to form an insulative washer between the stainless steel foil and the conductive layer on the non-conductive plate. A stainless steel ring is placed on top of the stainless steel foil and pressed down toward the non-conductive plate until the capacitance formed by the conductive layer screened onto the non-conductive plate and the stainless steel foil diaphragm reaches a predetermined level.

Abstract: An optical fiber position sensor utilizes a passive gray code encoded sensor head gray code for improved reliability. Optical energy is propagated to the sensor head over a plurality of optical fibers. At the sensor head, the optical energy is either reflected back along the same fiber or absorbed by the sensor head. The presence or absence of reflected optical energy on each fiber determine each bit state for a digital word. The sensor head is attached to a device to be monitored. Movement of the device causes translatory displacement of the sensor head relative to the fibers, thereby changing at least one bit state.

Abstract: A capacitive sensor is constructed to eliminate electrical conduction through a liquid being measured. The electrical conduction in the liquid occurs between the plates of the reference and measuring capacitors. The capacitive plates which are spaced from the common capacitive plate to form the reference and measuring capacitors are of unitary construction and formed from anodized aluminum. The anodization forms an insulated surface which prevents conduction between the electrodes through the liquid. A ratio taken between the measuring capacitor and reference capacitor is therefore indicative of the level of the liquid within the gap of the measuring capacitor and is independent of the conductance of the liquid and its dielectric constant. Such a probe is particularly useful in applications where the liquid undergoes indeterminable changes in conductivity such as a lubricant which becomes contaminated by metallic particulates.

Abstract: A corrosion proof differential pressure transducer includes a central disk and two thin diaphragms mounted close to but spaced from the disk on both sides thereof, with the diaphragms being intercoupled to move together. This may be accomplished, for example, by a rod passing through a hole in the center of the central disk which is secured to each of the diaphragms; or by a fluid such as silicone oil in the space between the diaphragms and flowing through one or more holes through the central disk. At least one of the diaphragms, the central disk and the rod (when one is used) are formed of alumina, quartz, or other inert, insulating material having substantially zero mechanical hysteresis. One of the diaphragms may be a thin, tough, flexible insulating membrane. Conductive plates providing variable capacitance with changes in pressure may be mounted on the inner surface one or both of the diaphragms and on the facing surface of the central disk.

Abstract: A corrosion proof differential pressure transducer includes a central disk and two thin ceramic diaphragms mounted close to but spaced from the disk on both sides thereof, with the diaphragms being intercoupled to move together. This may be accomplished, for example, by a rod passing through a hole in the center of the central disk which is secured to each of the diaphragms; or by a fluid such as silicone oil between the diaphragms and flowing through one or more holes through the central disk. The diaphragm, and disks and the rod are formed of alumina, quartz, or other inert, insulating material having substantially zero mechanical hysteresis. Conductive plates providing variable capacitance with changes in pressure are mounted on the inner surface one or both of the diaphragms and on the facing surface of the central disk. A housing and associated gaskets direct pressures from two different fluids to the two diaphragms, so that the differential pressure is measured.

Abstract: The coefficient of the dynamic friction of the surface of a memory disk or disks may be measured by tilting the entire memory unit, with the magnetic head being mounted for limited movement in the direction of relative movement of the head and the surface. The movement of the memory disk initially carries the head to its extreme position in the direction of movement of the disk. At a certain angle, as the memory unit is tilted from the horizontal toward the vertical, the weight of the head will overcome the dynamic force of the disk-head drag and the head movement to its lower position will be sensed; and the operative component of the weight of the head and its mount at the critical angle will be substantially equal to the dynamic drag or frictional force between the head and the associated disk or disks.

Abstract: A force measuring system for measuring the deflection force of spring-mounted magnetic reading and writing heads, and other parts, includes a capacitive type pressure transducer, of the type having two spaced insulating plates wherein at least one of the plates is a flexible diaphragm; a standardized pivoted force transmitting arm having one rounded end thereof engaging the center of said flexible diaphragm; a movable carriage for holding the magnetic head or other part to be tested under predetermined levels of deflection; guide plate arrangements for controlling the movement of the carriage so that the magnetic head or other part is brought into engagement with the end of the force transmitting arm; micrometer arrangements for providing a controlled amount of deflection of the reading head assembly or other part when the magnetic head engages the force transmitting arm; and measuring and display arrangements for indicating the force applied to the diaphragm at the predetermined level of deflection.

Abstract: A high pressure capacitive transducer includes a capacitive pressure transducer having an insulating diaphragm, and a high pressure fitting for housing the transducer. The high pressure fitting includes a flexible metal diaphragm bonded to the fitting, with the metal diaphragm in engagement with the insulating diaphragm. The metal diaphragm may be boned to the fitting around the periphery of the metal diaphragm to block the high pressure fluid from the transducer. The insulating diaphragm may be relatively thick, such as one-twentieth, one-tenth, or one-fifth of an inch thick, for example.

Abstract: A pressure or other transducer having a normal variable voltage output is converted to a unit having a variable current output in response to the normal output voltage with the minimum current drawn by the unit being only slightly greater than that required to operate the basic voltage-type transducer. The new current output system includes a voltage regulator and a voltage-to-current converter. The voltage-to-current converter includes an operational amplifier and an output transistor, with one input to the operational amplifier being set at a voltage equal to the output voltage of the voltage-type pressure transducer at zero pressure. The output from the voltage-type pressure transducer is connected through a first gain adjusting potentiometer to the second input of the operational amplifier; and an additional offset adjustment potentiometer is connected between the output of the voltage regulator and the junction between the gain adjustment potentiometer and the second input to the operational amplifier.