Source: http://www.google.com/patents/US6833999?dq=7125605
Timestamp: 2017-11-21 05:40:35
Document Index: 502765395

Matched Legal Cases: ['art 26', 'art 26', 'art 26', 'art 72', 'art 86', 'art 86', 'art 172', 'art 186', 'art 186']

Patent US6833999 - Optical module and method of making the same - Google Patents
An optical module comprises (1) an optical device assembly having an optical device for converting one of optical and electric signals into the other; (2) a circuit board for mounting an electronic device to electrically connect with the optical device; (3) a lead frame having a lead pin, a board mounting...http://www.google.com/patents/US6833999?utm_source=gb-gplus-sharePatent US6833999 - Optical module and method of making the same
Publication number US6833999 B2
Application number US 10/076,520
Also published as US20020114142
Publication number 076520, 10076520, US 6833999 B2, US 6833999B2, US-B2-6833999, US6833999 B2, US6833999B2
Inventors Hisao Go
Optical module and method of making the same
US 6833999 B2
an optical device assembly having an optical device for converting one of optical and electric signals into the other;
a circuit board for mounting an electronic device to electrically connect with said optical device;
a lead frame having a lead pin, a board mounting part for mounting said circuit board, and a support part which are provided on a reference surface;
a holding member having a holding part for grasping and holding said optical device assembly, and a grasping part for grasping said support part of said lead frame; and
a resin member for encapsulating said optical device assembly, said circuit board, said holding member, and said lead frame.
2. An optical module according to claim 1, wherein said grasping part has a base portion provided so as to extend along said reference surface, and a pressing portion for urging said support part of said lead frame toward said base portion.
a step of mounting said circuit board onto said board mounting part of said lead frame;
a step of grasping said support part of said lead frame with said grasping part of said holding member and supporting said holding member displaceable along said reference surface;
a step of grasping and holding said optical device assembly with said holding part of said holding member;
a step of providing wire bonding between said optical device assembly and said circuit board; and
a step of encapsulating said optical device assembly, said circuit board, said lead frame, and said holding member with a resin.
11. A method of making an optical module according to claim 10, further comprising a step of positioning said holding member prior to said resin encapsulating step.
wherein said step of supporting said holding member includes:
a step of engaging an edge portion of said support part between said base portion and said pressing portion; and
a step of pushing said holding member toward said support part.
The island 24, first lead array 16, second lead array 30, and support part 26 constituting the lead frame 40 are provided on a reference plane including the island 24. The first lead array 16 is constituted by 10 lead pins, and is connected to a mount board (not depicted), so as to make it possible to transmit electric signals between the optical module body 12 and the outside. On the other hand, the second lead array 30 is constituted by 8 lead pins, and is connected to the external board 14, so as to make it possible to transmit electric signals between the optical module body 12 and the external board 14. The first lead array 16 extends along the reference surface including the island 24. The second lead array 30 has a base portion 30 a extending along the reference surface and a bent portion 30 b bent at a predetermined angle with respect to the base portion 30 a.
FIG. 3 is a view showing, under magnification, the vicinity of the support part 26 included in the lead frame 40 shown in FIG. 2. As shown in FIG. 3, the support part 26 is provided on the reference surface including the island 24, whereas its edge portion 26 a on the side where the holding member 50 is introduced has a thickness smaller than that of the other portion.
Then, as shown in FIGS. 11A and 11B, pilot pins 82 of a mold 80 for resin molding are inserted into holes 76 formed in the outer frame part 72, whereby the lead frame 40 is positioned and attached to the mold 80. Here, since the light-emitting device assembly 28 is reliably held by the holding member 50, it hardly causes positional deviations during when the lead frame 40 is transferred to the mold 80, whereby the fear of bonded wires breaking is lowered. The relative positional accuracy between the mold 80 and the lead frame 40 is determined by the dimensional accuracy of the lead frame 40, and is about ±30 μm in general. On the other hand, the position of the light-emitting device assembly 28 with respect to the mold 80 is determined by a sleeve aligning part 86 which is a groove having a semicircular cross section. Since a thermosetting resin is injected into a cavity 88 at a high pressure in a transfer-molding step, the outer diameter of the sleeve 28 f and the sleeve aligning part 86 are under control so as to have a gap of about 10 μm therebetween.
The guide portion 128 b has a sleeve 128 f made of a metal material such as stainless steel. The sleeve 128 f is formed with a precise hole 128 k for receiving and positioning a ferrule. A through hole 128 l is formed so as to reach the precise hole 128 k from an end of the sleeve 128 f opposite from the end formed with the precise hole 128 k.
The electronic device 120 is a signal processing device for carrying out a predetermined processing operation to a signal received thereby and outputting the processed signal, e.g., a device incorporating therein an amplifier circuit for amplifying the electric signal outputted from the light-receiving device 118 included in the light-receiving device assembly 128. As shown in FIG. 15, the electronic device 120 is mounted on the internal board 122 made of an epoxy multilayer wiring board or the like, whereas the internal board 122 is mounted on the island 124 of the lead frame 140. The potential of the land on the rear face thereof is Vee, whereby the potential of the island 124 is Vee.
Then, as shown in FIGS. 22A and 22B, pilot pins 182 of a mold 180 for resin molding are inserted into holes 176 formed in the outer frame part 172, whereby the lead frame 140 is positioned and attached to the mold 180. Here, since the light-receiving device assembly 128 is reliably held by the holding member 150, it hardly causes positional deviations during when the lead frame 140 is transferred to the mold 180, whereby the fear of bonded wires breaking is lowered. The relative positional accuracy between the mold 180 and the lead frame 140 is determined by the dimensional accuracy of the lead frame 140, and is about ±30 μm in general. On the other hand, the position of the light-receiving device assembly 128 with respect to the mold 180 is determined by a sleeve aligning part 186 which is a groove having a semicircular cross section. Since a thermosetting resin is injected into a cavity 188 at a high pressure in a transfer-molding step, the outer diameter of the sleeve 128 f and the sleeve aligning part 186 are under control so as to have a gap of about 10 μm therebetween.
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U.S. Classification 361/813, 361/809, 385/92
International Classification G02B6/42, H01L31/02, H01S5/022, H01L33/58
Cooperative Classification G02B6/4204, G02B6/4219, G02B6/4292, G02B6/4239
European Classification G02B6/42C5V6, G02B6/42D, G02B6/42C5