Abstract In an optical semiconductor device having a light emitting element mounted on a heat sink, a first casing for supporting and covering the light emitting element and the heat sink, and a second casing for supporting and covering the first casing and further having output leads extended externally, a laminated ceramic substrate provided with a conductive pattern having one end connected to the light emitting element and the heat sink and the other end connected to the output leads is provided as a part of the first casing so as to partially replace a wall of the first casing with the laminated ceramic substrate. Since leads extending from the first outer casing and leads extending from the second outer casing are connected by a laminated ceramic substrate formed with a conductive pattern within the device, it is possible to freely determine the arrangement direction and the number of the leads while maintaining the hermetic characteristics of the heat sink, thus enabling the electric circuit elements to be integrated on the laminated ceramic substrate.
An optical semiconductor device comprising: a heat sink; a light emitting element mounted on said heat sink; a first casing for supporting and covering said light emitting element and said heat sink; a second casing for supporting and covering said first casing and further having output leads extending externally from said second casing; and a laminated ceramic substrate forming part of said first casing, wherein said laminated ceramic substrate includes a conductive pattern having a first end connected to said light emitting element and said heat sink and a second end connected to said output leads.
Claim 2
Dependent Claim
96 words
An optical semiconductor device comprising: a heat sink; a light emitting element mounted on said heat sink; a first casing for supporting and covering said light emitting element and said heat sink; a second casing for supporting and covering said first casing and further having output leads extending externally from said second casing; and a laminated ceramic substrate forming part of said first casing, wherein said laminated ceramic substrate includes a conductive pattern having a first end connected to said light emitting element and said heat sink and a second end connected to said output leads.
Claim 3
Dependent Claim
81 words
An optical semiconductor device as recited in claim 1, further comprising: a light receiving element which monitors light emitted from said light emitting element; a lens which condenses said light emitted from said light emitting element; and an optical fiber which guides said light condensed by said lens out of said second casing; wherein said light receiving element, said lens, and said optical fiber are supported by said first casing; and said optical fiber is also supported by said second casing.
Claim 4
Dependent Claim
49 words
An optical semiconductor device as recited in claim 1, wherein said conductive pattern in said laminated ceramic substrate is formed so as to allow said output leads to extend externally at an angle substantially perpendicular to an optical fiber, said optical fiber guiding light out of said second casing.
Claim 5
Dependent Claim
28 words
An optical semiconductor device as recited in claim 1, wherein said laminated ceramic substrate forming part of said first casing partially replaces a wall of said first casing.