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US 2002/0154592 A1Published application
Superimposing circuit module
AssigneeMurata Manufacturing Co., Ltd.
InventorsKoji Tanaka, Kazuhiro IIda, Mitsuhiro Matsumoto
Life of this patent
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Abstract
A small-sized superimposed circuit module has reduced spurious electromagnetic wave emission and small variations in circuit parameters. A resonance circuit portion of an oscillator and a portion of a noise rejection filter are embedded in a multilayer ceramic substrate, and the remaining circuit components are mounted on the surface of the multilayer substrate. The upper surface of the multilayer substrate is covered with a metal case.
Claims26
A superimposing circuit module comprising:
- a superimposing circuit for reducing an effect of returned light upon a laser light source for illuminating an information storage medium with a laser beam, the superimposing circuit module including a plurality of circuit elements defining an oscillator, wherein at least a portion of the plurality of circuit elements defining the oscillator are embedded in a multilayer substrate.
A superimposing circuit module comprising:
- a superimposing circuit for reducing an effect of returned light upon a laser light source for illuminating an information storage medium with a laser beam, the superimposing circuit module including a plurality of circuit elements defining a noise rejection filter, wherein at least a portion of the plurality of the circuit elements defining the noise rejection filter in said superimposing circuit are embedded in a multilayer substrate.
Dependencies are inferred from the claim text.