Abstract: A projection display is provided including a rod-like waveguide (7), an image providing light source device (10) located at a first side (9) of the waveguide (7) to inject image bearing light into the waveguide (7), through the first side (9). An input means (12) is provided on the waveguide (7) adjacent one end (13) at a second side (14) opposite to the first side (9) to reflect the image bearing light internally along the waveguide (7). An output transmission grating (18) is provided along a third side (19) of the waveguide (7) through which image bearing light is outputted from the waveguide (7). A plate-like waveguide (8) is located with an edge surface (23) thereof adjacent to and in line with the third side (19) of the waveguide (7) to receive the image bearing light from the waveguide (7). The waveguide (8) includes an exit grating (25) on or at a first surface (26) thereof for diffracting the received image bearing light out of the waveguide (8) towards a viewer (6).

Abstract: The invention relates to a retractable display device for a motor vehicle comprising a light source (8) for generating a displayable information and a retractable blade (1) for reflecting information towards the vehicle user. Said blade (1) is mounted on a movable support (2) displaceable between a rest position and at least one display position in such a way that said blade (1) is retracted when the movable support (2) is in the rest position and the blade is unfolded when said movable support (2) is in the display position.

Abstract: A reflective image display system includes: at least one light source; at least one light guide set in front of the light source; an image panel set in front of the light guide; and a surface with the feature of at least partial specular reflection. Wherein the light emitted from the light source illuminates the image panel via the light guide to project an image on the image panel onto the surface and then be reflected to an observer, so as to form a virtual image observed by the observer. The light guide of the present invention can reduce the light loss of the reflective image display system and make the illumination light on the image panel more homogeneous and possessing high directionality, and so as to improve the brightness and quality of the virtual image formed by the reflective image display system.

Abstract: There is provided an optical device, having a light-transmitting substrate having at least two major surfaces (26) parallel to each other and edges; optical means (16) for coupling light waves located in a field-of-view into the substrate by internal reflection, and at least one partially reflecting surface (22) located in the substrate which is non-parallel to the major surfaces of the substrate, characterized in that at least one of the major surfaces is coated with a dichroic coating.

Abstract: An exemplary embodiment of the invention relates to an on-axis or near on-axis optical head mounted projection display optical assembly for transmitting and magnifying a real image to an eye. The assembly comprises a miniature display, a projection lens for receiving the light rays from the display, a second lens positioned to receive the light from the projection lens, a beam splitter positioned for receiving and splitting the light rays from the second lens, a retro-reflective screen positioned for receiving the reflected portion of the split light rays from the beam splitter, and then reflecting the portion of split light rays wherein the portion of split light rays passes through the beam splitter. A third lens is positioned to receive the portion of split light rays from the retro-reflective screen and through the beam splitter.

Abstract: A projection zoom lens includes, from a screen side to an image source side, a first lens group having a negative refractive power, a second lens group having a positive refractive power, a third lens group having a positive refractive power, a fourth lens group having a negative refractive power and a fifth lens group having a positive refractive power. Zooming the projection zoom lens from the wide-angle end to the telephoto end causes the second, third and fourth lens groups to move toward the screen side, and the first and fifth lens groups are kept stationary. The projection zoom lens may further include an auto iris being axially movable with the fourth lens group, a composite prism and a cover glass. The projection zoom lens satisfies several conditions so that it can effectively eliminate aberrations and improve the projection image quality.

Abstract: A fluidic lens may have a transparent window member, a transparent distensible membrane, an inner ring between the window member and membrane, and a top ring disposed such that the membrane is between the piston ring and the inner ring. A layer of liquid may be stored between the window member, the inner ring and the membrane. The top ring may be adapted to apply a liquid displacement force to the membrane in a direction perpendicular to a plane of an aperture of the inner ring to cause a change in a radius of curvature of the membrane. The membrane may be pre-tensioned prior to assembly with the other components.

Abstract: An optical element includes a first liquid, a second liquid, and a container, wherein the first liquid and the second liquid substantially differ in refractive index and are immiscible, the first liquid and the second liquid are hermetically placed in the container so that an interface between the first liquid and the second liquid forms a specific shape, the shape of the interface between the first liquid and the second liquid is changed by applying a voltage between the first liquid and the second liquid through electrodes formed in the container, and the container is (1) a resin container of which an inner surface portion of a container wall has a resin phase with a fluorine atom content higher than that of an internal portion of the container wall, (2) a container of which a top portion and a bottom portion are formed of a resin composition including a resin and a hindered amine compound having a transmittance of light with a wavelength of 400 nm measured for a 5 wt % chloroform solution using a cell with

Abstract: A refractive-type zoom lens optical system includes a first lens group having a negative lens power and including a reflection member, a second lens group having a negative lens power, a third lens group having a positive lens power, a fourth lens group having a negative lens power, and a stop between the second lens group and the third lens group, wherein an overall length of the system is fixed during zooming and focusing.

Abstract: A zoom lens includes, from the object side, first and second lens units of negative and positive refractive power. The lens units move during zooming from the wide-angle end to the telephoto end. The first lens unit includes, from the object side, three negative lenses and a positive lens, at least one of the surfaces of these lenses being aspherical. A spherical surface whose center of curvature is on the optical axis and that includes a point of the intersection of a lens surface and the optical axis and a point on the lens surface determined by the effective aperture is referred to as reference spherical surface of the lens surface. In the first lens unit, the radiuses of curvature of the image-side reference spherical surface of the most object-side negative lens and the object-side reference spherical surface of the second most object-side negative lens are appropriately set.

Abstract: A zoom lens system comprising a first lens unit having negative power, a second lens unit having positive power and a third lens unit having positive power, wherein in zooming from a wide-angle limit to a telephoto limit, the lens units move respectively along an optical axis in such a manner that an interval between the first lens unit and the second lens unit decreases while an interval between the second lens unit and the third lens unit changes so that variable magnification is achieved, the first lens unit comprises one object side negative lens element and one image side positive lens element with a convex surface facing the object side, which have an aspheric surface, and the conditions: n12>1.88 and ?12<26 (n12 and ?12 are refractive index and Abbe number, respectively, of the image side positive lens element of the first lens unit) are satisfied.

Abstract: A zoom lens system comprising a first lens unit having negative power, a second lens unit having positive power and a third lens unit having positive power, wherein in zooming from a wide-angle limit to a telephoto limit, the lens units move respectively along an optical axis in such a manner that an interval between the first lens unit and the second lens unit decreases while an interval between the second lens unit and the third lens unit changes so that variable magnification is achieved, the first lens unit comprises one object side negative lens element and one image side positive lens element with a convex surface facing the object side, which have an aspheric surface, and the conditions: n 12>1. 88 and ? 12<26 (n12 and ?12 are refractive index and Abbe number, respectively, of the image side positive lens element of the first lens unit) are satisfied.

Abstract: A zoom lens system comprising a first lens unit having negative power, a second lens unit having positive power and a third lens unit having positive power, wherein in zooming from a wide-angle limit to a telephoto limit, the lens units move respectively along an optical axis in such a manner that an interval between the first lens unit and the second lens unit decreases while an interval between the second lens unit and the third lens unit changes so that variable magnification is achieved, the first lens unit comprises one object side negative lens element and one image side positive lens element with a convex surface facing the object side, which have an aspheric surface, and the conditions: n12>1.88 and ?12<26 (n12 and ?12 are refractive index and Abbe number, respectively, of the image side positive lens element of the first lens unit) are satisfied.

Abstract: A zoom optical system at least includes in the order from an object side: a first lens group having a positive optical power; a second lens group having a negative optical power; and a third lens group having a positive optical power. In zooming from a wide angle end to a telephoto end, a distance between the first lens group and the second lens group is increased, and a distance between the second lens group and the third lens group is decreased. The first lens group includes at least one negative lens element, and the second lens group includes a negative lens element closest to the object side, with a lens surface of the negative lens element being concave toward an image side.

Abstract: An exemplary zoom ratio adjusting switch includes a panel, a rotary member and a spring. The panel defines first and second grooves whose innermost extremities are on a circumference of a circle. Each groove includes a wide part and a narrow part. The rotary member includes a body positioned to a top side of the panel and first and second locking legs extending from the body. The first and second locking legs extend though the wide parts and slide in the narrow parts respectively. Feet extend from the locking legs respectively at the bottom side of the panel and are restrained at the bottom side of the panel. The spring is positioned to the bottom side of the panel and restrains travel of the first locking leg from the narrow part to the wide part of the first groove.

Abstract: A second optical element is bonded to a first optical element by forming the second optical element by pressing a second optical element material against the first optical element under a condition free from restriction to the second optical element material in the direction orthogonal to a direction in which the second optical element material is pressed.

Abstract: An imaging lens enables a large focal depth and low error sensitivity. The imaging lens satisfies “0.016<?/f<0.018,” where ? is the absolute value of longitudinal chromatic aberrations at F curve and C curve wavelengths, and f is the combined focal distance of the entire compound imaging lens. A first, a second, and a third lens are disposed sequentially, the first lens disposed toward an object, and the third lens disposed toward an image surface. The first lens has a positive refraction, a meniscus shape, and a convex surface facing the object. The second lens has a meniscus shape with a concave surface facing the object. The third lens has a convex-type shape facing the object; and a concave-type aspherical shape facing the image surface, providing a negative refraction in a radially central portion and a positive refraction in a radially peripheral portion.

Abstract: A second optical element is bonded to a first optical element by forming the second optical element larger in diameter than the first optical element by pressing a second optical element material against the first optical element under a condition free from restriction to at least part of the second optical element material in the direction orthogonal to a direction in which the second optical element material is pressed.

Abstract: An image-forming lens set includes a positive power first lens, an aperture stop, a negative power second lens and a positive power third lens, which are arranged from an object side in order. The first lens has a convex surface facing the object side, and at least one surface thereof is a non-spherical surface. The second lens is a convex-concave lens having a concave surface facing the object side, and at least one surface thereof is a non-spherical surface. The third lens has two non-spherical opposite surfaces including a convex surface facing the object side. At least one of the first, second and third lenses is coated with a layer of optical film for filtering light. By means of the lenses having non-spherical surfaces, the image-forming lens set has a simple structure. By means of the optical film, the image formed in a better quality can achieve.

Abstract: A color lens (10) includes a lens body (100) having two opposite surfaces (110, 120). A nano-material layer (130) is formed on one of the surfaces. An anti-reflect layer (140) is formed on the nano-material layer. A protect layer (150) is formed on the anti-reflect layer configured for protecting the nano-material layer and the anti-reflect layer. The nano-material layer is comprised of paint material particles (132) and color pigment.

Abstract: A motor vehicle rearview mirror for producing an image of an object situated outside and behind the vehicle, the rearview mirror comprising a lens (1; 1?; 1?; 1??) and a mirror (2) and being characterized in that the lens is a diverging concave lens having an optical axis (Al) and an optical focus (Fl; Fl?; Fl?), and the mirror is a mirror that is substantially concave, light beams (Fse, Fc, Fsi) passing through the diverging lens towards the mirror that reflects them in converging manner substantially without optical distortion in a direction that corresponds to the viewing axis of the driver looking at the mirror, characterized in that the mirror (2) defines a concave reflective surface (21) that corresponds substantially to a segment of a cylinder.

Abstract: An objective lens used for a microscope includes a lens(es), an iris diaphragm and a tubular body. The lens(es),which is provided in a manner facing an object, transmits light reflected from a measuring surface of the object. The iris diaphragm, which is provided behind the lens(es), changes an aperture diameter of a light-transmissive aperture of a light-transmissive surface that is substantially orthogonal to a main optical axis of the light transmitted through the lens(es). The tubular body, which is detachably mounted on a revolving nosepiece of a trunk that includes a zoom imaging lens(es) for forming an image from the light transmitted through the light-transmissive aperture, holds the lens(es) and the iris diaphragm.

Abstract: An imaging lens is provided and includes: in order from the object side, a first lens group including a biconcave lens; a second lens including two lenses whose convex surfaces are arranged opposite to each other and having a positive refractive power as a whole; a third lens group including a biconcave lens; and a fourth lens group including two lenses whose convex surfaces are arranged opposite to each other and having positive refractive power, as a whole, the imaging lens satisfying the specific condition.

Abstract: A projection lens for magnifying and projecting input light on a screen is disclosed. The projection lens in accordance with an embodiment of the present invention includes: a first lens having a positive refractive power; a second lens having a negative refractive power and receiving the light that has passed through the first lens; and a third lens combined with the second lens to form a lens group having a positive refractive power and receiving the light that has passed through the second lens and projecting the light on the screen separated by a predetermined length from the lens group.

Abstract: A connection between two components supported in a mutually vibrating fashion has at least one connection element connecting the two components, and a gap located between the two components in which a medium is located. The gap has a width small enough to largely prevent a displacement of the medium inside the gap during comparatively fast relative movements between the two components.

Abstract: In the lens drive unit; the position retaining parts are advanced by rotating the position retaining member, which is held in the case body in such a manner as to become rotatable, in the R direction so that the position retaining parts are positioned just under the protrusion parts of the movable lens body, and eventually the movable lens body can be retained at the middle position. Furthermore, the through-holes are advanced by rotating the position retaining member in the R direction so that the through-holes are positioned just under the protrusion parts of the movable lens body, and eventually the protrusion parts loosely get fitted into the through-holes of the position retaining member to enable the body tube holder to move downward.

Abstract: An actuator of the present invention includes a holder 8 for holding a lens 13; an upper guide 3 and a base 9 for supporting the holder 8 so that the holder 8 can move in the optical axis direction of the lens 13; and spherical bodies 2, disposed in spaces between the holder and the upper guide 3 and between the holder 8 and the base 9, which are able to rotate in the spaces, respectively, the upper guide 3 and the base 9 supporting the holder 8 via the spherical bodies 2. This makes it possible to provide a compact and slim actuator excellent in impact resistance.

Abstract: A technology for preventing cracks from occurring in a light reflector plate fabricated by forming a synthetic resin reflector plate into a three-dimensional shape and effectively preventing deformation of this light reflector plate is provided. A folding groove part 6 is provided on a light-reflecting plastic film or sheet 2 by continuously or intermittently forming a groove which does not penetrate the film or sheet, along a straight line on the film or sheet. Then, the film or sheet is folded along this folding groove part.

Abstract: Various embodiments of a system and method for producing a thin film filter are disclosed.

Abstract: A method of controlling a drive of a recording medium according to one embodiment includes receiving data from a host, and writing the data to the recording medium. A difference in volume between the data at the time of being received from the host and the data at the time of being written to the recording medium is detected. An adjustment is made to at least one of a first transfer rate with the recording medium, and a second transfer rate with the host, based on the difference.

Abstract: A method for reading data using a magnetic head having a first array of elements associated with a first data format, and a second array of elements associated with a second data format, the elements being selected from a group consisting of readers, writers, and combinations thereof, wherein the first and second arrays of elements are generally laterally adjacent each other in a direction transverse to a direction of travel of a magnetic medium over the head, the method comprising: determining a format of data on a medium; selecting one of the arrays of elements to read the data on the medium based on the determined format of the data; and positioning the selected array over the data on the medium.

Abstract: Methods and apparatus to perform hard-disk drive head proximity detection in a preamplifier are described. One example method of detecting head position in a hard-disk drive includes obtaining a read signal from a head reading information from a disk; determining a signal envelope of the read signal; comparing the signal envelope to a first threshold to produce a first comparison; filtering the signal envelope; comparing the filtered signal envelope to a second threshold to produce a second comparison; combining the first comparison and the second comparison; and determining if the combination of the first comparison and the second comparison indicates head position oscillation.

Abstract: In a magnetic disk drive having a magnetic circuit for moving a magnetic head by driving an actuator having the magnetic head mounted thereon, to a target track, and a base having a height criterion member for carrying out positioning in a height direction of the magnetic circuit as a result of the magnetic circuit being fixed thereto, wherein in a condition in which the magnetic circuit is fixed to the height criterion member, a space is provided between the base and a bottom surface, a spring member is provided for applying force to the magnetic circuit in such a direction that the magnetic circuit is apart from the bottom surface.

Abstract: Embodiments of the present invention provide a magnetic disk drive, in which a disturbance component contained in an output signal from a rotational vibration detector, can be appropriately suppressed irrespective of frequency of the component, and a method of controlling the drive. According to one embodiment, in a magnetic disk drive having a rotational vibration detector for detecting rotational vibration of a drive housing, a main control circuit performs a head moving step of driving a voice coil motor to move a magnetic head on a magnetic disk, a frequency estimation step of estimating a frequency of each disturbance component contained in an output signal from the rotational vibration detector after moving the magnetic head, and a suppressor setting step of setting a notch filter for suppressing the disturbance component based on the estimated frequency.

Abstract: A servo signal recording apparatus and servo-signal recording method for recording a servo signal on a magnetic tape that includes a magnetic layer having a data area capable of storing data and a servo area capable of storing a servo signal, the apparatus including a transportation unit for transporting the magnetic tape; a DC erasing unit on a downstream side in a magnetic tape transportation direction that performs DC erasure to a surface layer portion of the magnetic layer by magnetization in a longitudinal direction of the magnetic tape; and a servo signal recording unit on a downstream side of the DC erasing unit in the magnetic tape transportation direction, that rubs against the magnetic layer of the magnetic tape, and records a servo signal in the servo area by magnetization in a direction opposite to a direction of the magnetization of the DC erasing unit.

Abstract: An apparatus for transporting a storage media cartridge in a data storage library is disclosed. The apparatus includes an accessor, a pinion and a rack having a straight section and a curved section. The curved section includes multiple rack teeth that are capable of rotating independently from each other to allow the pinion to travel along the straight section and onto the curved section of the rack, or vice versa, without any interruption.

Abstract: A system and method for providing corrosion protection for a magnetic read/write head is disclosed. A monolayer surface coating is applied to cover those portions of the under layer of a magnetic read/write head not already covered by a previously applied diamond-like coating. This allows for a thinner diamond like coating than previously applied in the art. The monolayer surface coating can be a self-assembled monolayer, such as an organosilicon for hydroxylated surfaces or carboxylic acids for aluminum or other metal oxides. Alternatively, the monolayer surface coating can be directly applied to the under layer with no diamond-like coating being present. The monolayer surface coating can be applied by a surface immersion process or by a vacuum coating process.

Abstract: A magnetic recording medium includes: a substrate; a recording layer that is formed on the substrate to have a grooved pattern; and a protection layer formed on the recording layer to fill in the grooved pattern, wherein the recording layer is defined to have a servo portion that retains servo data and a recording track portion that retains recording data, and wherein a first film thickness of the protection layer at the servo portion is larger than a second film thickness of the protection layer at the recording track portion by a thickness that is in a range from 1 nm to 10 nm.

Abstract: According to one embodiment, a magnetic disk device includes a case provided with a base and a top cover. On the base in the case are arranged a motor, a disk-shaped recording medium rotatably supported on the motor, a head, a head actuator which supports the head for movement with respect to the recording medium, and a ramp load mechanism. The ramp load mechanism includes a ramp arranged on the outer peripheral side of the recording medium, and an engaging portion which extends from the head actuator and is configured to run on the ramp when the head is moved to the outer peripheral portion of the recording medium. The ramp has a recess and an elastically deformable bridge portion which straddles the recess and being fixed between the base and the top cover with the bridge portion elastically pressed against the pressing portion of the top cover.

Abstract: A storage device includes a head configured to record information in or reproduce the information from a recording medium, a suspension configured to support the head, a lift tab provided onto the suspension, a ramp, which the lift tab elastically contacts, the lift tab being configured to slide on the ramp, the ramp being configured to support the lift tab so as to hold the head at a position apart from the recording medium in loading the head over the recording medium and in unloading the head from the recording medium, and a heating member provided outside the ramp at a position close to the ramp.

Abstract: According to an aspect of an embodiment, a magnetic recording medium includes a substrate, and a first granular layer formed over the substrate, the first granular layer having a plurality of first magnetic particles and Si oxide separating the plurality of first magnetic particles. The magnetic recording medium further includes a second granular layer formed over the first granular layer, the second granular layer having a plurality of second magnetic particles and Ti oxide separating the plurality of second magnetic particles.

Abstract: A thin film magnetic head comprises a lower magnetic shield layer and an upper magnetic shield layer which are mutually opposed in the layering direction, a magnetoresistance effect element having a free layer, and a bias-applying layer which applies a bias magnetic field to the magnetoresistance effect element. The free layer is positioned between the lower magnetic shield layer and the upper magnetic shield layer, and is positioned on the side of the media-opposed surface. The bias-applying layer has a first portion, a second portion, and a third portion. The first portion and the second portion are positioned at a distance in the track width direction so as to enclose the magnetoresistance effect element therebetween. The third portion is positioned either between the magnetoresistance effect element and the lower magnetic shield layer or between the magnetoresistance effect element and the upper magnetic shield layer, and connects the first portion and the second portion.

Abstract: A magnetic head device includes a TMR sensor or a CPP GMR sensor. Shield layers are disposed in contact with the top and bottom of a sensor body. A sensing current is supplied to the sensor body through the shield layers. Lead layers are connected to the shield layers and extend to below conductive pads. Ends of the lead layers are electrically connected to the conductive pads via lifting layers. Heat-conducting layers are disposed below the ends of the lead layers. An insulating layer is formed between the heat-conducting layers and an end surface of a slider body to such a thickness that it does not obstruct heat transfer. Heat applied from a molten solder to the lead layers is released to the slider body through the heat-conducting layers. This prevents the shield layers from being heated to high temperature.

Abstract: An underlying layer is composed of Co—Fe—B that is an amorphous magnetic material. Thus, the upper surface of the underlying layer can be taken as a lower shield layer-side reference position for obtaining a gap length (GL) between upper and lower shields, resulting in a narrower gap than before. In addition, since the underlying layer has an amorphous structure, the underlying layer does not adversely affect the crystalline orientation of individual layers to be formed thereon, and the surface of the underlying layer has good planarizability. Accordingly, PW50 (half-amplitude pulse width) and SN ratio can be improved more than before without causing a decrease in rate of change in resistance (? R/R) or the like, thereby achieving a structure suitable for increasing recording density.

Abstract: A method for providing a giant magneto-resistive (GMR) sensor for use in sensing magnetic flux is provided. The method comprises positioning a layer of Cu material between first and second layers of a specified ferromagnetic material. The respective end surfaces of the Cu layer and the first and second layers are initially located in a common plane and in a co-planar relationship with one another. The method further comprises removing an amount of material from the copper layer to form a new end surface thereof that is selectively spaced apart from the common plane and applying a protective coating to the new end surface of the Cu layer to inhibit corrosion of the Cu layer.

Abstract: An anti-parallel pinned sensor is provided with a spacer that increases the anti-parallel coupling strength of the sensor. The anti-parallel pinned sensor is a GMR or TMR sensor having a pure ruthenium or ruthenium alloy spacer. The thickness of the spacer is less than 0.8 nm, preferably between 0.1 and 0.6 nm. The spacer is also annealed in a magnetic field that is 1.5 Tesla or higher, and preferably greater than 5 Tesla. This design yields unexpected results by more than tripling the pinning field over that of typical AP-pinned GMR and TMR sensors that utilize ruthenium spacers which are 0.8 nm thick and annealed in a relatively low magnetic field of approximately 1.3 Tesla.

Abstract: An area of an element can be made small and fluctuation in area can be reduced. A magneto-resistance effect element is provided with a first electrode with an end face; a magneto-resistance effect film which is formed such that a surface thereof comes in contact with the end face of the first electrode; and a second electrode which is formed on another surface of the magneto-resistance effect element opposed from the surface coming in contact with the surface of the first electrode. The magneto-resistance effect film includes a magnetization pinned layer whose magnetization direction is pinned, a magnetization free layer whose magnetization direction is changeable, and a first non-magnetic layer which is provided between the magnetization pinned layer and the magnetization free layer.

Abstract: A power converter includes a controller and at least one output terminal for providing an output voltage and an output current to a load. The controller is configured for monitoring the output voltage and the output current and calculating an efficiency of the power converter based on the monitored output voltage and output current. The controller is also configured to generate a fault signal after detecting a degradation in the power converter efficiency.

Abstract: An integrated circuit formed on a semiconductor chip includes voltage regulators for stepping down an externally-supplied power voltage to produce an internal power voltage, and internal circuits which operate based on the internal power voltage. The voltage regulators are laid in the area of the buffers and protective elements for the input/output signals and power voltages so that the overhead area due to the on-chip provision of the voltage regulators is minimized. The internal power voltage is distributed to the internal circuits through a looped main power line, with an electrode pad for connecting an external capacitor for stabilizing the internal power voltage being provided on it, so that the internal power voltage is stabilized and the power consumption of the integrated circuit is minimized.

Abstract: An intrinsically safe network switch (200) includes five electronically isolated ports, four for connections in hazardous areas (206-1, 206-2, 206-3, 206-4) and one for receiving an unsafe Ethernet input (204). The device may use 10/100 mbps Ethernet cables and connectors and provides speed and activity LED indicators for each port. The device may be din rail-mountable, wall mountable, or desk mountable, and includes an integral heat sink for cool operation. The device incorporates internal barriers and isolated circuitry to guarantee safety and high-integrity signals with resistance to ambient EMI/RFI radiation. This network switch (200) could be any Ethernet communication devices such as hub, managed or unmanaged switch etc. Also, it could have total “n” number of ports (isolated or un-isolated) with 1 port for safe area and “n?1” port of hazardous area. The number of ports for safe and hazardous area can be varied to meet specific application requirements.