297 results about "Reading distance" patented technology

An optical reader including an image sensor, imaging optics, a short range aiming assembly, and a long range aiming assembly. The short range aiming assembly may comprise a plurality of LEDs. The long range aiming assembly may comprise a laser diode assembly which projects an aiming pattern that is readily visible at reading distances of several feet. The optical reader can be configured so that long range aiming assembly is enabled or disabled depending upon a present operating condition.

Lighted reading glasses are provided to enable clear reading of normal sized text to occur when the reading material is held at usual distances from the reader in dimly lit or dark locations. The lighted glasses have high intensity lights, such as in the form of LEDs that generate narrow light beam cones and which are oriented via light mounts as by inward canting of the light beam cones to meet and overlap so high brightness light is generated in a conical overlap area of light which is maximized in size in the range of normal reading distances. The light mounts include housings that are very compactly sized via the use of small coin cell batteries for powering the LEDs they hold. The housings are tapered from their maximum width sized to be slightly larger than the diameter of the disc-shaped cell batteries to either end thereof along their length, and have a depth sized to accommodate two of the stacked very thin, e.g., one-eighth of an inch each, coin cell batteries. In this manner, a very small and compact light module is provided that, while especially well-suited for reading glasses due to the preferred inward cant provided by light mounting surfaces of the housing to tailor the location of the overlap lighted area to the reading area, can also be used with other types of head gear, such as caps or other types of hats.

Lighted reading glasses are provided to enable clear reading of normal sized text to occur when the reading material is held at usual distances from the reader in dimly lit or dark locations. The lighted glasses have high intensity lights, such as in the form of LEDs that generate narrow light beam cones and which are oriented via light mounts as by inward canting of the light beam cones to meet and overlap so high brightness light is generated in a conical overlap area of light which is maximized in size in the range of normal reading distances. The light mounts include housings that are very compactly sized via the use of small coin cell batteries for powering the LEDs they hold. The housings are tapered from their maximum width sized to be slightly larger than the diameter of the disc-shaped cell batteries to either end thereof along their length, and have a depth sized to accommodate two of the stacked very thin, e.g., one-eighth of an inch each, coin cell batteries. In this manner, a very small and compact light module is provided that, while especially well-suited for reading glasses due to the preferred inward cant provided by light mounting surfaces of the housing to tailor the location of the overlap lighted area to the reading area, can also be used with other types of head gear, such as caps or other types of hats.

The present invention provides a system and method for optimizing the performance of 13.56 MHz frequency RFID tags in conjunction with metal substrates. Briefly, a thickness exists for each type of RFID isolator material at which the performance of a 13.56 MHz RFID tag is optimal when used with metal. Varying from this optimal value, in either the positive or negative direction adversely affects read distance. A method of determining this optimal thickness is disclosed, as well as an RFID tag or a substrate being used in conjunction with a material of this thickness.

The invention relates to a benchmark testing system and a method for RFID label operating level. The benchmark testing system comprises a support for labels to be tested, a transceiver and reference antenna support, wherein a transceiver and reference antenna is placed in a standard testing environment. A circulator, a spectrum analyzer, an RFID signal generator and a power meter are placed outside the standard testing environment. The method is that an RFID label chip and the antenna are viewed as a whole body, the input level and the output level of an RFID label system are measured throughthe transceiver and reference antenna by adopting the transmission formula of electromagnetic waves in a free space, the minimum level capable of activating the operation of an RFID label is calculated and the theoretical reading distance of the RFID label is estimated. Through the scientific, repetitive and comparable non-contact measurement of the RFID label power consumption which is one of important indicators determining the performance of the RFID label, the problems that the existing technical indicators are ambiguous and the error of the testing results is great, and assistant decision basis is provided for users to select RFID label products according to the different application requirements.

A method for adjusting a font size on a screen is disclosed. The method includes: establishing a relationship between reading distances and font sizes. When the reading distance is decreased, the font size is increased. The distance is determined by detecting a real reading distance from the screen. A character with the corresponding font size on the screen is shown according to the real reading distance.

The invention relates to a device and a method for calibrating the communication distance of a radio frequency SIM card. The device comprises a microcontroller MCU (200), a radio frequency emitting and receiving modulation demodulator (201), a radio frequency power detection module (202), an analog to digital converter (203) and a radio frequency antenna (204). The method comprises the following steps: a calibration value is set on a radio frequency power calibrating device; a radio frequency power calibrator (100) sends an instruction to a radio frequency SIM card (104) and receives power sent from the radio frequency SIM card (104) to compare with the pre-set calibration value; the radio frequency power calibrator (100) sends relevant instructions to the radio frequency SIM card (104) to increase or reduce sending power till the sending power is completely identical with the calibration value according to judging results. By adopting the calibration method, the effect of a mobile terminal on the signal shielding difference of the radio frequency SIM card can be eliminated, so that different mobile terminals have identical card reading distance.

The present invention provides a system and method for optimizing the performance of 13.56 MHz frequency RFID tags in conjunction with metal substrates. Briefly, a thickness exists for each type of RFID isolator material at which the performance of a 13.56 MHz RFID tag is optimal when used with metal. Varying from this optimal value, in either the positive or negative direction adversely affects read distance. A method of determining this optimal thickness is disclosed, as well as an RFID tag or a substrate being used in conjunction with a material of this thickness.

A method and apparatus for reading a target object having areas of differing light reflectivity on the target such as a handheld bar code reader having a first illumination pattern, a detector for measuring a distance from the reader to a target object, a system threshold, and a comparator for evaluating the measured distance against the threshold. Should the reader's internal circuitry and / or software determine that the measured distance is greater than the threshold, a second illumination pattern is activated that has power effective illumination for increasing the operable reading distance between the reader and the target object. The second illumination pattern can be generated from a secondary illumination source or through a lens internal to the reader.

The invention relates to an anti-metal tag antenna applied in an RFID (radio frequency identification device) system on a UHF (ultra high frequency) band, relating to the technical field of a radio frequency identification type electronic tag. The antenna mainly comprises a metal substrate, a dielectric plate and an antenna structure. The antenna structure is arranged on the upper surface of the dielectric plate, the metal substrate is arranged on the lower surface of the dielectric plate, and the antenna structure is communicated with the metal substrate through metal through holes. The antenna structure mainly comprises an asymmetric metal radiating surface and an open circuit line, and the open circuit line is connected with the radiating surface and is arranged parallel to feeder lines. The feeder lines on the two sides of a chip are respectively connected with the metal radiating surface and the metal through holes. Since the radiating surface of the antenna is asymmetric, current paths are different, the dual-band approximation of the antenna to the same resonant point can be achieved, and the bandwidth of the antenna can be broadened. High gain and broad bandwidth can be achieved simultaneously, and the theoretical reading distance is more than 16m in the American frequency band from 902MHz and 928MHz. The anti-metal antenna can be applied in situations with large reading distances, such as license plate identification.

A novel measurement technique is employed using surface acoustic wave (SAW) devices, passive RF, and radiation-sensitive films to provide a wireless passive radiation sensor that requires no batteries, outside wiring, or regular maintenance. The sensor is small (<1 cm2), physically robust, and will operate unattended for decades. In addition, the sensor can be insensitive to measurement position and read distance due to a novel self-referencing technique eliminating the need to measure absolute responses that are dependent on RF transmitter location and power.

A preferred embodiment of a hand-held radio frequency identification reader includes a first casing suitable for being grasped by a user, a second casing, and a transceiver housed within one of the first and second casings. The reader also includes an antenna housed within the second casing and communicatively coupled to the transceiver for communicatively coupling the reader to a radio frequency identification tag. The second casing is movably coupled to the first casing so that the second casing can be aligned with the radio frequency identification tag to substantially maximize a read distance of the reader while the first casing is held in a substantially fixed position in relation to the radio frequency identification tag.

The invention relates to a detection and control method and a system of bar code reading equipment, wherein, the method includes the following steps: initialized location parameter, command parameter and target value is received; according to the initialized location parameter, each drive unit is controlled to work and the location of a bar code worktable and / or a reading equipment worktable is adjusted; according to the command parameter and the target value, resolution test, reading distance test, reading angle test and / or symbol contrast test are executed; finally, test result is recorded through comparing bar code symbol and the bar code reading equipment. The system comprises an initialized module, a testing item module and a result processing module which complete the steps of the method, wherein, the testing item module comprises a resolution test unit, a reading distance test unit, a reading angle test unit and / or a symbol contrast test unit. The invention which can adapt to bar code reading equipment of different dimensions and models tests the reading distance of the equipment and plots the reading graphic; moreover, the invention has strong versatility and wide application.

The invention discloses an implantable passive ultrahigh frequency RFID temperature sensing tag for animal breeding. The implantable passive ultrahigh frequency RFID temperature sensing tag comprises a metal conformal antenna outer shell, high-dielectric-constant dielectric materials and an RFID tap chip for collecting animal temperature information and sending the animal temperature information in a radio frequency signal mode. The high-dielectric-constant dielectric materials are arranged inside the metal conformal antenna outer shell, the RFID tap chip is embedded into the bottoms of the dielectric materials, and the operating frequency band of the RFID tag chip is an ultrahigh frequency band. The invention further discloses a sensing method of the implantable passive ultrahigh frequency RFID temperature sensing tag for animal breeding. According to the implantable passive ultrahigh frequency RFID temperature sensing tag, a sensor is integrated, and the implantable passive ultrahigh frequency RFID temperature sensing tag is low in tap falling rate, long in recognition and reading distance, low in requirement for biology compatibility, small in size and low in price.

A RFID tag may be configured to selectively emit a signal including information, such as the identity of the tag and / or an associated item, that is detectable by a tag reader or other interrogator at different distances. The RFID tag may include hardware and / or software for changing the range of the RFID tag. For example, a tag may include more than one antenna. One antenna may be constructed and arranged to send a signal a greater distance than another antenna. The range may be changed by disabling an antenna and / or switching the antenna that is used to send a signal.

A scanning reader of an optical code placed on a front wall of an article in movement comprises generators that form at least one first and one second light beam lying on planes inclined by a first and by a second prefixed angle ( alpha , beta ) with respect to the front wall so as to explore a first and a second area of the front wall by at least one first and one second scanning line and read the optical code within an overall distance range, along the direction of forward movement of the article, greater than the useful range of reading distance that can be reached by one light beam only.

The invention discloses a desk lamp. A lighting lamp body of the desk lamp comprises a casing, a first light source and a rotating disc are arranged in the casing, a plurality of optical filters in different colors are embedded on the rotating disc, light emitted by the first light source is transmitted out from the optical filters in the different colors to change colors irradiated through the first light source, and the light in different colors can be selected according to learning contents. A sensing light adjustment control unit for switching a power supply switch and adjusting luminance of the first light source is arranged in the lamp body of the desk lamp, a touch sensing face is arranged on the outer casing of a base, and the luminance of the first light source can be adjusted through the touch sensing face. Color changing and color matching of the desk lamp can be carried out according to the learning contents, and learning efficiency is improved. The desk lamp has functions of automatically switching between a small night lamp and a reading distance reminder, the small night lamp can light while sleeping, has the function of attracting attention and brings convenience to users to determine the position of the desk lamp, the reading distance reminder can prevent myopia, and functions of the desk lamp is comprehensive.

The present disclosure provides a rotating-polarization reflector-backed Radio Frequency Identification (RFID) loop antenna apparatus and method. The loop antenna apparatus and method provides high gain (i.e., maximizing read distances at lowest power), directionality (i.e., ability to focus on specific areas), orientation insensitivity (i.e., ability to read RFID tags in any direction or orientation) while occupying minimal volume in overhead configurations. In an exemplary embodiment, the loop antenna apparatus includes a reflector and a loop element with the reflector configured to reflect downward RF energy from the loop element. Antenna polarization is controlled by a feed location on the loop element and antenna pattern is controlled by the reflector. Thus, orientation insensitivity may be achieved without changing the antenna pattern by rotating the feed location and not the reflector.

The invention discloses an active RFID identification system and a control method thereof for accurately reading a boundary. The active RFID identification system consists of an active RFID card reader and an active RFID card, wherein the active RFID card reader comprises a low-frequency transmitting device used for continuously transmitting low-frequency trigger signals, and a high-frequency receiving device used for receiving a confirmation signal transmitted by the active RFID card; and the active RFID card comprises a low-frequency receiving device used for receiving the low-frequency trigger signals transmitted by the low-frequency transmitting device of the active RFID card reader and modulating coded information of the low-frequency trigger signals at the same time, and a high-frequency transmitting device used for receiving a confirmation signal transmitted by a logic control circuit and transmitting the confirmation signal to the receiving device of the active RFID card reader. The invention combines advantages of the low-frequency trigger signals and a high-frequency receiving function, so the card reading distance can be accurately controlled.

This invention belongs to radio identification technique field and relates to object surface adhesive electron label and package materials selection test method, which comprises the following steps: a, using real time frequency spectrum analyzer to test object surface feedback signal intensity; b, testing electron label static read distance parameters; c, testing electron label dynamic read distance parameters; d, integral test result selecting object surface best position; e, changing object surface medium materials to test read distance parameters.

The invention provides a special high-temperature and high-pressure RFID (radio frequency identification device) tag for an oil field. The tag comprises a basic material, a chip, a feed line and an antenna receiving / transmitting surface, wherein one surface of the basic material is the front surface of the electronic tag; the other surface of the basic material is an antenna grounding surface; the antenna receiving / transmitting surface on the front surface of the electronic tag is connected with the antenna grounding surface on the rear surface of the electronic tag through a short-circuit groove to form a microstrip antenna; an anode of the chip is connected with the antenna receiving / transmitting surface through the feed line; the grounding end of the chip is connected with the antenna grounding surface on the rear surface of the electronic tag through a through hole; and the tag is packaged by a secondary package material of a housing. The tag has the advantages of small size, long reading distance and strong adaptive capacity to the environment.

The invention provides a wine bottle anti-counterfeiting system adopting the RFID (radio frequency identification) technology. The system is characterized by including RFID tags, RFID readers, a data acquisition device, a database server and RFID card readers, wherein each RFID tag is embedded in each wine bottle during production, and is provided with the only tag number. The wine bottle anti-counterfeiting system adopting the RFID technology has the advantages that each tag has the only tag number, so as to prevent modification and counterfeiting; each tag also has certain memory space for information reading and writing, so that the tag number can be encrypted in a special manner to prevent copy and counterfeiting; the RFID card readers have physical interfaces that are not directly open to end users, so as to protect the safety of the RFID card readers, and prevent people who counterfeit wine bottles from counterfeiting the card readers; and the system has the advantages of long service life, elimination of mechanical wear or failure, passive operation, operability in harsh environments, antifouling performance, long data reading distance, etc.

The invention relates to a coupled feeding horizontal omni-directional annular radio frequency identification (RFID) label antenna. Existing RFID antennas are mostly in a dipole structure, the directional graph is perpendicular to the surface of the antenna and commonly applied to a vertical surface of an object, and when the vertical surface of a target object is not enough to provide an available area for an RFID label, the structure is not applicable any more. The coupled feeding horizontal omni-directional annular RFID label antenna comprises a substrate, a radiation outer ring antenna and a coupled feeding inner ring structure, wherein the radiation outer ring antenna and the coupled feeding inner ring structure are arranged on the substrate, and the two rings are in a concentric structure. The coupled feeding horizontal omni-directional annular RFID label antenna is small in structure, capable of working below the federal communications commission (FCC) frequency range (902-928 MHz), and capable of being attached to the upper surface and the lower surface of the target object, the radiation directional graph is omni-directional on a horizontal plane, and the reading distance can reach 9.5 m as far as possible.

The invention discloses a speed measurement system based on an ultrahigh frequency radio frequency identification label and a measurement method. The measurement system comprises a radio frequency identification label, a first antenna, a second antenna, a radio frequency identification reader and a data center. The first antenna and the second antenna are connected to the radio frequency identification reader respectively. The radio frequency identification reader receives signals emitted by the radio frequency identification label through the first antenna and the second antenna respectively and sends to the data center respectively. The method in the invention is based on an ultrahigh frequency RFID technology. A Lagrange interpolation method is used to expand a data source. Through a maximum value time difference method of Gaussian fitting between partitions and kalman filter combination and a correlation time difference method of a Phat processor and SCOT weighting, data read by a reader is processed so that accurate measurement of a walking speed is realized. By using the system and the method, an error can be effectively reduced and precision is increased, and a large calculated amount is not needed. The ultrahigh frequency RFID label possesses advantages that the size is small; a price is low; a reading distance is long and so on. The system and the method can be made into a sensor which can be worn on an elder so as to carry out accurate measurement of the walking speed.

The invention discloses an anti-theft electronic tag. The electronic tag comprises a power module, a radio frequency module, a tearing perceiving module, a main control module and a storing module, wherein the power module supplies power for the electronic tag, the tearing perceiving module is used for perceiving tearing state information of the electronic tag, the main control module receives the tearing state information sent by the tearing perceiving module and controls the radio frequency module to send tag identification information, the storing module stores the tag identification information to be sent when a reader is powered down, and the tearing perceiving module comprises a photosensitive detection unit or a broken line detection unit. The electronic tag can perceive and trigger the main control module to send corresponding tag identification information through the photosensitive detection unit or the broken line detection unit when the electronic tag is torn off, is far in reading distance, low in power consumption and long in service life of batteries per unit capacity.