| 摘要 |
802,429. Transistors. MINNEAPOLISHONEYWELL REGULATOR, CO. Jan. 20, 1955 [Jan. 21, 1954], No. 1786/55. Class 37. A junction transistor has one electrode in good thermal contact with a good heat conducting mounting member, and is enclosed in a cover sealed to a flange which surrounds and is in poor heat conducting relationship with the mounting member. In Fig. 1, a germanium, silicon, or other semi-conductor body 18 has alloyed junction electrodes 16 and 17 forming the emitter and collector respectively. The collector electrode is larger than the emitter and is mounted on a block 19 on a mounting base member 11, which are good thermal conductors and dissipate the heat from the collector electrode. Ring 18, 18a of nickel constitutes the base electrode. The whole is enclosed in a sealed housing through which are sealed the emitter and base leads 27 and 26. The housing comprises a cover 12 soldered to a flange 13 surrounding member 11 ; flange 13 is of low thermal conductivity so that the semi-conductor body is unaffected by the heat during sealing. A lead 28 is connected to cover 12, which is connected via flange 13 and mounting member 11, to the collector electrode. The whole may be supported on a chassis by insulated mounting means. Electrode leads 20, 21 are of nickel, and shaped to minimize thermal effects. A heat sink may be used when sealing cover 12 to ring 13. The enclosure may be filled with helium. The emitter and collector electrodes may be made by heating a pellet of germanium-indium alloy in contact with the germanium wafer to between 525 and 538‹ C., cooled rapidly to 455‹ C. and then slowly to room temperature. Reference has been directed by the Comptroller to Specification 749,392. |
