Abstract:
A receiving device for a global positioning system and an antenna structure thereof. The receiving device includes a housing, a circuit board and the antenna structure. The circuit board is disposed inside the housing and has a ground portion and a signal feeding portion. The antenna structure is disposed inside the housing and includes a metal plate, a first electric conducting element and a second electric conducting element. The metal plate is used for receiving a GPS signal. The first electric conducting element has one end coupled to the metal plate, and the other end coupled to the ground portion of the circuit board. The second electric conducting element for feeding the GPS signal to the circuit board has one end coupled to the metal plate, and the other end coupled to the signal feeding portion of the circuit board.
Abstract:
An electronic apparatus with a hidden antenna comprises a metal frame and a substrate. The metal frame comprises a plurality of side walls and a notch is passed through at least one side wall. A feeding terminal is configured at a bottom side of the notch. A first shorting terminal and a second shorting terminal are configured at two lateral sides of the notch. A metal surface of the substrate is electrically connected to the first shorting terminal, the second shorting terminal and the side walls, and the notch is faced to the substrate. The metal frame receives or transmits an electromagnetic signal, and delivers the electromagnetic signal over the feeding terminal, and a length of the bottom side of the notch is one half of a wavelength of the electromagnetic signal.
Abstract:
An antenna comprises an external high-band portion and an internal low-band portion. The external high-band portion reduces energy dissipation from nearby components, and the internal low-band portion reduces the phantom head effect. The antenna combines the external high-band portion and the internal low-band portion, utilizing the advantages of the two portions to benefit the receiving efficiency of the antenna.
Abstract:
In a shadow mask employed as a color selection electrode in a multi-electron beam color cathode ray tube (CRT), the surface area of the mask is reduced by increasing the length of the individual elongated beam passing apertures, or slots, while reducing the ratio of the width of the bridge portion of the mask between adjacent apertures to the length of the aperture. Increasing the length of the apertures while reducing the ratio of bridge width to aperture length reduces the surface area of the mask upon which energetic electrons are incident resulting in a corresponding reduction in thermal deformation, or doming, of the shadow mask. Reduction in shadow mask doming results in reduced landing shift of the electron beams incident on phosphor elements disposed on the inner surface of the CRT's display screen for improved video image brightness and color purity. More specifically, in a shadow mask having a thickness in the range of 0.12-0.18 mm with slotted apertures, the length of the slots is in the range of 0.90-10.00 mm and the ratio of bridge width to slot length is in the range of 0.001-0.110. With this invention, electron beam transmission through the shadow mask can be increased by as much as 22% resulting in a reduction in beam landing shift error by as much as 20 .mu.m. Video image brightness is increased by as much as 17% and the color purity adjustment margin is increased to over 10 .mu.m in, for example, a color CRT with a 20 inch display screen.
Abstract:
In a cathode ray tube (CRT) having a glass envelope with a neck portion, a funnel portion and a display screen, or front panel, an electron gun disposed in the CRT's neck portion has a plurality of aligned electrodes, including a charged shield cup. The shield cup includes a plurality of contact springs disposed about the outer periphery thereof and engaging a conductive layer on the inner surface of the CRT's neck portion for supporting the electron gun and charging the shield cup to an electron accelerating, or anode, voltage. Also disposed on the outer periphery of the shield cup and engaging the inner conductive layer is a getter support member. To provide a zero resultant force applied to the shield cup by the three contact springs and the getter support member and maintain the electron gun coaxial with the CRT's centerline, the thickness or strength of the contact springs is established such that the resultant force of the contact springs on the shield cup provides a reaction force to, and compensates for, the force exerted by the getter support member on the shield cup.
Abstract:
A receiving device for a global positioning system and an antenna structure thereof. The receiving device includes a housing, a circuit board and the antenna structure. The circuit board is disposed inside the housing and has a ground portion and a signal feeding portion. The antenna structure is disposed inside the housing and includes a metal plate, a first electric conducting element and a second electric conducting element. The metal plate is used for receiving a GPS signal. The first electric conducting element has one end coupled to the metal plate, and the other end coupled to the ground portion of the circuit board. The second electric conducting element for feeding the GPS signal to the circuit board has one end coupled to the metal plate, and the other end coupled to the signal feeding portion of the circuit board.
Abstract:
An antenna device including a ground plane, a circuit board, an antenna, and a conductive wire is provided. The circuit board includes a signal feed point, and the antenna includes a radiation portion and a feed portion extending externally from the radiation portion. The feed portion is electrically connected to the signal feed point, and the conductive wire is disposed on the circuit board and electrically connected to the ground plane and the signal feed point. The conductive wire is, for example, a printed trace formed on the circuit board.
Abstract:
An antenna device including a ground plane, a circuit board, an antenna, and a conductive wire is provided. The circuit board includes a signal feed point, and the antenna includes a radiation portion and a feed portion extending externally from the radiation portion. The feed portion is electrically connected to the signal feed point, and the conductive wire is disposed on the circuit board and electrically connected to the ground plane and the signal feed point. The conductive wire is, for example, a printed trace formed on the circuit board.
Abstract:
An adhesive label dispenser includes a drive unit for moving a carrier sheet with adhesive labels thereon, a support plate for guiding the carrier sheet, a conveying mechanism driven by the drive unit, and a sensor unit. The support plate includes a label output end at which the carrier sheet bends downward, freeing the adhesive labels from the carrier sheet. The conveying mechanism is located below the label output end. The conveying mechanism conveys the adhesive labels freed from the carrier sheet to an output end for fetch. The sensor unit detects whether one of the adhesive labels freed from the carrier sheet has reached a predetermined position and sends a signal for stopping or activating the drive unit.
Abstract:
An automatic detector for starting security cameras comprises a detection module disposed on a video camera and the detection module includes a regulator circuit, a light-sensitive circuit, a switch circuit, and a passive infrared sensor circuit, and a recorder control circuit. The passive infrared sensor circuit is connected to the main body of security cameras, the switch circuit is connected to a light and the recorder control circuit is connected to a video camera recorder. In accordance with the structure mentioned above, the main body of the security cameras and the video camera recorder is started by the passive infrared sensor circuit to detect the infrared energy emitted from human bodies. If the illumination of the environment is insufficient, the light-sensitive circuit makes the switch circuit work to switch the light on so that the light is enough to make the pictures clearly.