Taiyo Musen Co., Ltd.

Mitsubishi Electric Corporation

Kenzo Mori

Hyo Yasuda

Hideyuki Tanaka

Junji Fujino

Minoru Suzuki

Tsutomu Yamaguchi

Takehiro Nishida

Hiroo Sakamoto

Yoshihisa Tashiro

Kimio Fujii

Masaru Koshi

Mikio Ozawa

Fumio Kakuchi

An optical device package comprises: a metal frame including a substrate and a rectangular die pad portion integrally connected to the substrate, wherein the substrate is a metal plate, and the die pad portion is bent from the substrate such that the die pad portion extends from the substrate at an angle of 90 degrees; signal lead pins extend in the opposite directions from the die pad portion relative to the substrate such that the first lead pins intersect the principal surfaces of the substrate at a right angle and are spaced apart from the metal frame; and a molded resin member including a plate-like resin base extending across and in contact with one of the principal surfaces of the substrate, wherein the signal lead pins protrude from a surface of the resin base; surfaces of the signal lead pins are covered with the molded resin member; and the metal frame and the signal lead pins are secured in place by the molded resin member.

Optical device package and optical semiconductor device using the same

A semiconductor laser chip is joined to an AlN sub-mount in a junction-down manner. The sub-mount is joined to a package. The AlN sub-mount is joined to a stem. The direction perpendicular to the irradiation direction of a laser beam emitted from the semiconductor laser chip is the direction of the width of the sub-mount. The thickness and the width of the AlN sub-mount are determined so that the product of the equivalent stress applied to the center of the surface of the semiconductor laser chip joined to the sub-mount and the stress in the direction of the width of the sub-mount does not exceed 70% of the maximum value of the product obtained by changing the thickness and the width of the AlN sub-mount.

Semiconductor light emitting device and method for manufacturing the same

An optical device package comprises: a metal frame including a substrate and a rectangular die pad portion integrally connected to the substrate, wherein the substrate is a metal plate, and the die pad portion is bent from the substrate such that the die pad portion extends from the substrate at an angle of 90 degrees; signal lead pins extend in the opposite direction from the die pad portion relative to the substrate such that the first lead pins intersect the principal surfaces of the substrate at a right angle and are spaced apart from the metal frame; and a molded resin member including a plate-like resin base extending across and in close contact with one of the principal surfaces of the substrate, wherein the signal lead pins protrude from a surface of the resin base; surfaces of the signal lead pins are covered with the molded resin member; and the metal frame and the signal lead pins are secured in place by the molded resin member.

An antenna device for a direction finder includes a substantially grounded conductive base plate, a plurality of web-shaped antenna elements mounted in spaced relation on the base plate and having central portions extending in crisscross relation and insulated from each other, an electronic switching circuit for alternately grounding ends of the antenna elements and picking up reception outputs from opposite ends of the antenna elements at a constant period with the antenna elements being switched out of phase at an angle corresponding to the angle at which the antenna elements extend across each other, and a circuit for combining outputs from the antenna elements. According to another embodiment, the antenna elements comprise the web-shaped antenna elements and a vertical antenna element disposed substantially centrally in the web-shaped antenna elements.

Antenna device for direction finders

An automatic direction finder capable of measuring a direction with a higher accuracy is disclosed. In an initial measurement, loop antennas and a vertical antenna are used in a conventional manner. However, in a final measurement the vertical antenna adversely affected by the surrounding disturbances is not employed and only the loop antennas are used. The disclosed finder includes a switching device for disconnecting the vertical antenna in the final measurement. The finder is also provided with a pair of search coils disposed perpendicular to each other. One of the search coils is connected to a combining circuit via the switching device, while the other is connected to the combining circuit via a balanced modulator.

Automatic direction finder

In an antenna device for a direction finder including an electrically conductive antenna plate of a configuration symmetrical around its center and disposed in parallel with a base plate with a predetermined distance maintained therebetween, a plurality of pairs of connecting portions are provided around the antenna plate so that one in each pair is provided opposite to the other with respect to the center. An electronic switch provided in the device transfers the connection in order that one in a pair thus transferred is grounded through a resistor having the characteristic impedance of the antenna plate while the other in the pair is connected to the receiver of the direction finder through a cable having the characteristic impedance.

Plate antenna for direction finder

An automatic direction finder for automatically finding the arriving direction of electric waves by rotating a goniometer or the like with the use of a stepping motor is described. The stepping motor is controlled by means of a digital circuit using a reversible counter. The polarities of the phase of the output demodulated by a receiving circuit are detected in terms of the antinodes thereof.

A radio direction finder, which is designed to determine the direction of arrival of a radio wave by causing the rotation of a directional antenna arrangement or a goniometer, to which the output of the directional antenna arrangement is coupled, or rotating the directivity by an electric means and combining the output of the directional antenna arrangement or goniometer and the output of a non-directional antenna. With this system, it is possible to detect and display the bearing of the received radio wave with a higher place counter and precisely track and display the second bearing of the wave with a lower place counter.

Radio direction finder

A radio direction finder, designed to determine the direction of arrival of radio waves utilizing a nondirectional antenna and a plurality of directional antennas having respective directivities, comprises an oscillator for producing A.C. signals having a phase angle in correspondence to the configuration of each of the directional antennas, modulators for modulating the respective outputs of the directional antennas with respective A.C. signals, a additive circuit for superimposing the respective modulation outputs on the phase-shifted output of the nondirectional antenna, and a receiving circuit for demodulating the added output of the additive circuit to recover the A.C. signals. The radio direction finder is further characterized by an automatic phase tracking counter for following the phase of the output of the receiving circuit, and a display unit for displaying the bearing of the received radio wave numerically. Special circuitry is provided for achieving accelerated automatic phase tracking, for stopping the automatic phase tracking procedure upon the occurrence of certain disturbances, and for restarting the procedure upon disappearance of the disturbances.

An automatic direction finder wherein a loop antenna is fitted within a combined handle and index rotatably pivoted at the center of a direction dial, a gear of a diameter large enough is fixed to said index and a pinion meshing with said gear is connected through a frictional power transmission with a direct current servomotor to which an automatically controlled output of said antenna obtained from the output of said antenna is given.

Growing community of inventors

Tokyo, Japan

Kenzo Mori