Construction of tuning circuit in tuner
AssigneeAlps Electric Co., Ltd.
InventorKazuharu Aoki
Life of this patent
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Abstract
A printed circuit board lamination consisting of upper and lower printed circuit boards is provided with an area consisting of the sole lower printed circuit board, and a varactor diode and a resonance rod portion parallel to the lamination are arranged in this area. Thus, the length of lead of the varactor diode is reduced in effect, and also the effects of variation of the dielectric constant of the printed circuit board due to changes of the temperature thereof and relative humidity are reduced.
Claims4
In a construction of a tuning circuit for a tuner having a printed circuit board lamination constituted by an upper printed circuit board and a lower printed circuit board, said upper and lower printed circuit boards being laminated back to back, and electronic component parts being inserted in holes formed in the said printed circuit board lamination, the improvement comprising said printed circuit board lamination being provided with an area lacking said upper printed circuit board, and a varactor diode and a portion of a resonance rod parallel to said printed circuit board lamination being provided in said area with the lead of said varactor diode passing through said lower printed circuit board.
Dependencies are inferred from the claim text.