Claims
- 1. A method of adjusting inductance of a coil device, said method comprising the steps of:
- forming a first access inlet in an outside magnetic substance, said outside magnetic substance forming an endless loop of magnetic circuit;
- arranging an inside magnetic substance inside said outside magnetic substance;
- winding a coil around a bobbin movably mounted on said inside magnetic substance;
- forming a second access inlet in said outside magnetic substance so as to be adjacent said bobbin;
- providing at least one gap in a position corresponding to said inlet between said outside magnetic substance and said inside magnetic substance;
- measuring the inductance of said coil device;
- adjusting the inductance of said coil device by inserting an adjustment tool through said access inlet in order to vary the size of said gap; and
- further adjusting the inductance of said coil device by inserting said adjustment tool through said second access inlet in order to adjust the position of said bobbin.
- 2. A method of adjusting inductance of a coil device as defined in claim 1, further comprising the step of fixing the position of said inside magnetic substance relative to said outside magnetic substance.
- 3. A method of adjusting inductance of a coil device as defined in claim 2, wherein said position of said inside magnetic substance relative to said outside magnetic substance is fixed by means of an adhesive resin.
- 4. A method of adjusting inductance of a coil device as defined in claim 1, wherein said outside magnetic substance has a continuous endless structure.
- 5. A method of adjusting inductance of a coil device as defined in claim 1, wherein said outside magnetic substance and said inside magnetic substance form two gaps at both ends of said inside magnetic substance, said adjusting tool driving said two gaps at the same time.
- 6. A method of adjusting inductance of a coil device as defined in claim 5, wherein at least two access inlets are formed is said outside magnetic substance, each of said access inlets introduces said adjusting tool to each of said two gaps.
- 7. A method of adjusting inductance of a coil device as defined in claim 1, wherein said inductance is adjusted by solely moving said inside magnetic substance while maintaining the relative position between said outside magnetic substance and said bobbin constant.
- 8. A method of adjusting inductance of a coil device as defined in claim 1, wherein said inductance is adjusted by moving said inside magnetic substance and said bobbin together relative to said outside magnetic substance while maintaining the relative position between said inside magnetic substance and said bobbin constant.
- 9. A method of adjusting inductance of a coil device as defined in claim 1, wherein said inductance is adjusted by solely moving said bobbin around which said coil is wound while maintaining the relative position between said outside magnetic substance and said inside magnetic substance constant.
Parent Case Info
This is a continuation application of the U.S. patent application Ser. No. 07/922,693 filed Jul. 30, 1992 entitled "COIL DEVICE", now U.S. Pat. No. 5,345,209.
US Referenced Citations (17)
Foreign Referenced Citations (11)
Number |
Date |
Country |
43451 |
Jun 1934 |
FRX |
658259 |
Apr 1938 |
DEX |
51-62741 |
May 1976 |
JPX |
51-75545 |
Jun 1976 |
JPX |
55-50372 |
Dec 1980 |
JPX |
56-24363 |
Jun 1981 |
JPX |
58-33810 |
Feb 1983 |
JPX |
59-217311 |
Dec 1984 |
JPX |
879940 |
Oct 1961 |
GBX |
887204 |
Jan 1962 |
GBX |
1054341 |
Jan 1967 |
GBX |
Continuations (1)
|
Number |
Date |
Country |
Parent |
922693 |
Jul 1992 |
|