Abstract: A guide bar of a chain saw according to the present invention includes: an elongated plate-shaped guide bar body that supports a saw chain on its peripheral edge portion; a plurality of elongated holes formed through the guide bar body and positioned at both sides of a region that has a predetermined width and includes a central axis line CL extending in a longitudinal direction of the guide bar body, such that the region is positioned between the elongated holes, which are elongated in the longitudinal direction; and a plurality of attachment members, each of which is pre-formed in such a shape as to seal up a corresponding one of the elongated holes and attached to the corresponding elongated hole.

Abstract: A projector includes a light source and a prism total reflection modulator arranged on an optical path of light from the light source and modulating the light with an image signal. The prism total reflection modulator includes a prism having a plane of incidence arranged to allow entrance of light from the light source, and a total reflection surface arranged to totally reflect the light entering from the plane of incidence to a prescribed direction, a plurality of total reflection control elements arranged on the total reflection surface of the prism, for individually controlling whether light is to be totally reflected on the total reflection surface or not, and a driver for individually driving the plurality of total reflection control elements in accordance with the image signal.

Abstract: A multi-channel optical communication system includes an optical transmitting apparatus and an optical receiving apparatus. The optical transmitting apparatus has a retroreflector and a modulator for modulating light reflected by the retroreflector according to a transmission signal. The light receiving apparatus has a light source and a demodulating circuit for demodulating the transmission signal modulated by the modulator from the light emitted from the light source and reflected from the retroreflector. The modulator includes a plurality of optical reflection devices arranged on a reflection plane of the retroreflector and capable of controlling optical reflection independently of each other and a circuit for separately controlling each of the optical reflection devices. The demodulating circuit includes a CCD having a plurality of photoreceptors arranged correspondingly to the arrangement of the optical reflection devices.

Abstract: A bar code apparatus includes a reflecting plate having a main surface, and a plurality of polarizing plates arranged on at least a part of a plurality of areas defined with a predetermined interval and width on the main surface, each having an axis of polarization equal to any of a plurality of different directions, and a code is optically transmitted by light beams reflected from areas of the surface on which the polarizing plates are arranged and areas on which the polarization plates are not arranged. The apparatus may further include a transparent cover member of a color having similar hue to the polarizing plates.

Abstract: A telephone terminal includes: a first radio frequency communication unit; a second radio frequency communication unit that communicates through a weak wave; an optical communication unit; a telephony unit; a first switch that selectively couples the first or the second radio frequency communication unit to the telephony unit in response to an externally applied command; a incoming call detecting circuit connected to the first switch; and a second switch that selectively enables communication by the telephony unit through the first radio frequency communication unit or the optical communication unit in response to an incoming call detected by the incoming call detecting circuit, depending on the status of the first switch.

Abstract: A telephone regulation system to regulate usage of a telephone terminal that carries out conversation using a radio wave includes an approach recognition device provided at the neighborhood of an approach path to a predetermined region to transmit a first command through a weak wave to a portable telephone terminal passing through the neighborhood and entering the predetermined region, and a departure recognition device provided in the neighborhood of a departure path from the predetermined region to transmit a second command through a weak wave to a telephone terminal passing through the neighborhood and departing from the predetermined region.

Abstract: A multi-channel optical communication system includes an optical transmitting apparatus and an optical receiving apparatus. The optical transmitting apparatus has a retroreflector and a modulator for modulating light reflected by the retroreflector according to a transmission signal. The light receiving apparatus has a light source and a demodulating circuit for demodulating the transmission signal modulated by the modulator from the light emitted from the light source and reflected from the retroreflector. The modulator includes a plurality of optical reflection devices arranged on a reflection plane of the retroreflector and capable of controlling optical reflection independently of each other and a circuit for separately controlling each of the optical reflection devices. The demodulating circuit includes a CCD having a plurality of photoreceptors arranged correspondingly to the arrangement of the optical reflection devices.

Abstract: A mobile run management system includes a detector provided along a course for movement of mobiles for detecting the positions of mobiles running in a prescribed range of the course, a determiner for determining the distance between the mobiles in the prescribed range, and a transmitter for detecting that the determined distance between the mobiles is smaller than a prescribed value and selectively transmitting a signal for a warning to the second mobile following the first mobile. The second mobile can perform a prescribed operation for keeping a proper distance between the same and the first mobile in response to the signal for a warning. Preferably, the system further includes a device for changing the prescribed value compared with the determined distance between the mobiles in the transmitter. Proper run management can be made in response to the speeds of the mobiles by changing the prescribed value.

Abstract: An apparatus for preventing the driver of a vehicle from being blinded by the glare of light by selectively moving a light-shielding plate in two-dimensions along an inside surface of the windshield to provide a light-shielding region. The light-shielding plate is controllably moved by hand or by motor. More preferably, the apparatus further includes a microcomputer for obtaining the crossing point between light coming into the eye of the driver and the windshield plate, and a mechanism or circuit for moving the light-shielding plate to a shielding position defined by the microcomputer.

Abstract: A system for transmitting information to a moving object includes a light source disposed along a moving course for the moving object, an encoding device encoding the light beam emitted from the light source in accordance with a predetermined first signal allotted to the light source, a photodetecting device provided in the moving object, and a device for obtaining the first signal by decoding an output of the photodetecting device. The information typically includes positional data of the moving object. In departure from the case where the radio wave is employed in transmission, the system can operate with great reliability even when the light sources are closely arranged.

Abstract: A guide bar for a chain saw, the bar having oppositely located flat sides. A plurality of recesses are formed in each of the sides, the recesses on one side being offset from the recesses on the other side. At least some of the recesses are filled with a lightweight material. Some of the recesses may also function as oil reservoirs and oil passages between the guide grooves of the bar.

Abstract: A chain saw guide bar including an inner plate and a pair of outer plates fixed to both flat sides of the inner plate. The inner plate has holes formed therethrough. The outer plates also have holes formed therethrough, but they are smaller than the holes of the inner plate. The outer holes are each aligned with one of the inner holes, and the holes are filled with a lightweight material.

Abstract: Light reflecting means 2R and 2L provided on both sides of a road 1 each reflect an incident light at the same angle as the angle of incidence with respect to the plane of incidence. Lights 8R and 8L emitted from a moving vehicle 3 are reflected from the light reflecting means 2R and 2L and returned again to the light emitting source and accordingly they are detected by light receivers 75R and 75L. The position of the moving vehicle 3 is calculated geometrically based on the moving distance of the moving vehicle 3 in a period obtained from the difference between the light receiving time of the light receiver 75R and that of the light receiver 75L or the light receiving angle as well as the moving direction of the moving vehicle 3 and the positions where the light reflecting means 2R and 2L are installed.

Abstract: An information transfer system for transferring information to a fixed position from a moving object. The information system includes a light beam scanning along the route of the moving object. The light beam is linearly deflected. The moving object is provided with a modulation-reflection apparatus which receives the linearly-deflected light and changes a rotary angle at a polarization surface based upon information from the moving object itself such as object number, destination, or running speed. This modulates the incident light and reflects it back in the direction from which it came. The reflected light from the modulation-reflection apparatus is received through a light-sensitive detection device which allows the light to pass corresponding to the rotary angle of the polarization surface. Consequently, information regarding the moving object is discriminated.

Abstract: A follow-up guidance and information transfer system is disclosed for use between a control point and a moving object utilizing a laser beam generated at the control point. The incident beam is directed by a movable mirror toward the moving object and reflected therefrom by a corner cube or the like along the same path. A detector disposed in the passing zone detects direction and amplitude of deviations of the reflected beam from the path of the incident beam, and a mirror control responds to the detected signals to direct the path of the incident beam to follow the moving object.

Abstract: This disclosure relates to a chain saw guide bar including a main or body part and a front part. The two parts fit together in a tongue-and-groove joint having a V configuration, and the parts are secured together by fasteners such as rivets. A chain guide groove is formed in the periphery of the two parts, and the front part may include a rotatable sprocket for the chain.

Abstract: A path indicating apparatus for indicating a path so that a moving vehicle movable in the horizontal and vertical directions, such as an aircraft, may move along such a predetermined path. The predetermined path is defined as an intersecting line of two scanning planes which are formed by scanning signals having a narrow beam width in a horizontal plane and a vertical plane, respectively. The vehicle is provided with a plurality of detectors arranged in the horizontal and vertical directions for detecting the signals being scanned in the horizontal and vertical planes, respectively, so that the detectors arranged in the vertical and horizontal directions may detect deviation of the vehicle in the horizontal and vertical planes, respectively. The vehicle is responsive to the detected signals from the respective detectors to determine the moving direction to be taken by the vehicle so that the vehicle may move along the path and the vehicle is steered responsive to the determined direction outputs.

Abstract: A reference station is provided at a fixed position. The station is adapted to transmit a scanning signal the transmitting direction of which is scanned in succession in different directions, a positional information signal representative of the position of the reference station and an azimuth information signal representative of a particular azimuth. A vehicle moving with respect to the reference station is provided with receivers at three positions spaced apart from each other by given distances, so that when the vehicle moves in the service area of the reference station the signals transmitted by the reference station are received. The current position of the vehicle and the moving direction of the vehicle are operated based on a time or phase difference from receipt of the particular azimuth signal until receipt of the scanning signal by the three receivers, the position of the reference station and the distances between the three receivers provided in the vehicle.

Abstract: A system for generating the data concerning the position of a moving vehicle comprising paired independently rotatable wheels provided at the opposite sides of the moving direction of the vehicle, the system comprising first and second pulse generators independently and operatively coupled to the respective wheels for generating digital signals associated with the rotation speed of the respective wheels, a distance measuring device responsive to the outputs from said first and second digital signal generators for evaluating the moving distance of the vehicle, a direction storing device responsive to the outputs from said first and second digital signal generators for evaluating the moving direction of the vehicle, and a position determining device responsive to the moving distance and moving direction determinations for evaluating the moving position information of the vehicle.