Claims
- 1. A torch for fabricating a porous preform for a core used in fabricating single-mode optical fibers, said torch comprising a glass raw material gas blowing nozzle and a combustible gas blowing nozzle, said combustible gas blowing nozzle surrounding said glass raw material gas blowing nozzle in such a manner that a glass raw material gas blown out from said glass raw material gas blowing nozzle is deviated from the center of an inner area defined by said combustible gas blowing nozzle, with respect to an oxy-hydrogen flame stream blown out from said combustible gas blowing nozzle.
- 2. A torch as claimed in claim 1, wherein an inert gas blowing nozzle, said combustible gass blowing nozzle and an auxiliary gas blowing nozzle are disposed surrounding said glass raw material gas blowing nozzle in this order, and said glass raw material gas blowing nozzle is deviated from the center of an inner area defined by said inert gas blowing nozzle.
- 3. A torch as claimed in claim 2, wherein a diameter controlling gas blowing nozzle is disposed adjacent to said glass raw material gas blowing nozzle in said inner area defined by said inert gas blowing nozzle for blowing out a diameter controlling gas to control the diameter of said porous preform for core and a subsidiary combustible gas blowing nozzle is arranged adjacent to said diameter controlling gas blowing nozzle.
- 4. A torch as claimed in claim 2, wherein said inert gas blowing nozzle, said combustible gas blowing nozzle and an auxiliary gas blowing nozzle are disposed surrounding said glass raw material gas blowing nozzle in this order, and a controlling gas blowing nozzle is disposed adjacent to both sides of said glass raw material gas blowing nozzle in an inner area defined by said inert gas blowing nozzle, so that said raw material gas blown out from said glass raw material gas blowing nozzle is deviated relative to said oxy-hydrogen flame stream by a controlling gas blown out from said controlling gas blowing nozzle.
Priority Claims (2)
Number |
Date |
Country |
Kind |
54-129530 |
Oct 1979 |
JPX |
|
55-93841 |
Jul 1980 |
JPX |
|
Parent Case Info
This is a division of application Ser. No. 06/188,914, filed Sept. 19, 1980, now U.S. Pat. No. 4,345,928.
US Referenced Citations (4)
Number |
Name |
Date |
Kind |
4062665 |
Izawa et al. |
Dec 1977 |
|
4135901 |
Fujiwara et al. |
Jan 1979 |
|
4224046 |
Izawa et al. |
Sep 1980 |
|
4259101 |
Tsukuda et al. |
Mar 1981 |
|
Foreign Referenced Citations (2)
Number |
Date |
Country |
2625064 |
Jun 1977 |
DEX |
2906523 |
Sep 1979 |
DEX |
Non-Patent Literature Citations (2)
Entry |
Sudo et al., "Low-OH-Content Optical Fiber . . . ," Electronic Letters; Aug. 17, 1978, vol. 14, No. 17, pp. 534-535. |
Izawa et al., "Continuous Fabrication Process for High-Silica Fiber Preforms," The Transactions of the IECE of Japan, Nov. 1979, vol. E6Z, No. 11, pp. 779-785. |
Divisions (1)
|
Number |
Date |
Country |
Parent |
188914 |
Sep 1980 |
|