摘要:
A high frequency device includes a metal case; a printed board configured to be inserted in the case; a projecting part configured to project to an inside of the case; a solder guiding hole formed at the projecting part, the solder guiding hole being configured to guide solder from an internal circumferential side to an external circumferential side of the case, the solder being configured to connect the case and the printed board to each other; a board concave part formed in a position of the printed board, the position corresponding to the projecting part; and a land surface formed on the printed board along an edge of the board concave part, wherein the printed board is provided so that a part of the solder guiding hole is positioned above the land surface when the printed board is inserted in the case.
摘要:
A tuner housing according to the invention comprises a support for carrying electronic equipment and at least one cover part which is attached to the support. The support comprises at least one ground lug (11) which extends through a hole (12) of the cover part. The cover part is provided with a projection which projects into the hole (12) and contacts the ground lug (11).
摘要:
A television tuner includes a metal frame having first to fourth side plates. The area inside the metal frame is divided by a shield plate into a first division adjacent to the first side plate and a second division adjacent to the second side plate opposite to the first side plate. A first connector for receiving a television signal is disposed on the third side plate interfacing with the first division. The first division contains a first wideband amplifier disposed adjacent to the first connector and a distributor disposed between the first wideband amplifier and the fourth side plate such as to be adjacent to the first wideband amplifier. A second connector for outputting one of two signal components split in the distributor is disposed on the first side plate. A tuning section is disposed in the second division.
摘要:
A shielded modular tuner (10) is horizontally mounted onto a chassis printed circuit board (20) and is provided, through an aperture in the shield, with lead connections (15) from the edge of the tuner printed circuit board (13) to the chassis printed circuit board (20), for power supply, control signals, outputting a processed signal, etc. The RF signal is coupled to the tuner via a conductive pin/lead (26) extending from an RF signal conducting path (28) on the chassis printed circuit board (20), passing through a second aperture (30) in the shield, directly to the point on the tuner printed circuit board where the signal is to be inputted for tuner processing. In this way, the RF signal is injected directly into the tuner precisely where it is needed without being led along a longer and possibly meandering path from the edge of the tuner printed circuit board, and without a shielded coaxial cable and accompanying connectors.
摘要:
A radio frequency amplifier includes first and second amplifier circuits (8a,8b) with a waveguide filter (10) provided therebetween. With this arrangement, transmission loss is reduced and distortion of the amplifier circuits is reduced compared with conventional amplifiers. It is therefore possible to provide a high-performance radio frequency amplifier.
摘要:
Es wird eine Hochfrequenz-Baugruppe für Rundfunk-, Fernseh- und dergleichen Empfangsgeräte angegeben, die einen Tuner (10), eine Sende-Empfangs-Einheit (12) und ein Abschirmgehäuse (14) umfaßt. Der Tuner (10) ist zum Empfangen von Rundfunk-, Fernseh- und/oder dergleichen Signalen vorgesehen. Die Sende-Empfangs-Einheit (12) ist zum Senden und Empfangen von Informationssignalen vorgesehen. Sowohl der Tuner (10) als auch die Sende-Empfangs-Einheit (12) sind in dem Abschirmgehäuse (14) integriert.
摘要:
The tuner structure of the present invention includes: a circuit board on which electronic circuit components such as transistors and resistors have been mounted; a chassis angle; and a shield cover. In the tuner structure, a feedthrough capacitor for inputting/outputting a power, a control signal and the like is mounted to a metal plate disposed in parallel to the circuit board.
摘要:
A shield assembly for installation on a portion of a printed circuit board is presented. The shield (16) assembly includes a shield mounted on the component mounting side of the printed circuit board and has a plurality of support projections (30) inserted through apertures of the printed circuit board to the conductor side where they are mechanically secured and electrically connected to a reference potential. A first shield cover (22) is mounted to the shield at a peripheral edge distal of the printed circuit board. A second shield cover (34) is disposed at the conductor side of the printed circuit board. The second shield cover (34) is provided with two pluralities of protrusions (32, 42). The first plurality of protrusions (32) extends through apertures in the printed circuit board to engage the body of the shield. The second plurality of protrusions (42) engages respective support projections (30) of the shield.