Comb filter
AssigneeTDK Corporation
InventorsMasaaki Izumida, Sinya Nakai, Akira Ohashi
Life of this patent
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Abstract
A comb filter for a television receiver set for separating a video signal into a color signal and an intensity signal has a single support with fixed holders for keeping a solid delay line circuit and a related process circuit in place. The holders have grooves or slits for accepting said solid delay line circuit and said process circuit. The process circuit has some adjustable electronic components which are adjusted by using a laser beam or sandblast so that dip frequency of the filter is adjusted. The adjustment is carried out before the filter is mounted on a television set so that no adjustment is necessary after the filter is mounted on the television set.
Claims8
A comb filter comprising;
- a support;
- an ultrasonic delay line element mountable on said support,
- a process circuit board having a substrate and electronic components on said substrate, the electronic components being coupleable with said delay line element to implement a comb filter circuit,
- some of said electronic components on said process circuit board being subject to adjustment,
- a first holder fixed to said support, said first holder having a groove which accepts said delay line element,
- a second holder fixed to said support, said second holder having a groove which accepts said substrate of the process circuit board,
- a plurality of pins fixed to said substrate for external connection of the comb filter,
- a housing covering said process circuit board and said solid delay line by being engaged with said support,
- said second holder being fixed in front of said first holder so that components on said substrate can be adjusted without being covered by said delay line element.
Dependencies are inferred from the claim text.