PURPOSE: To equalize electric characteristics such as a dielectric constant or Q by specifying an expansion ratio by a non-sufficiently supported solid shrunk component caused by pressure keeping with the foaming operation of a foaming agent.
CONSTITUTION: In the case of injecting foaming materials, the foaming materials are loaded at a ratio more than 80 weight % in comparison with the capacity of the cavity of upper and lower dies 11 and 12. The loading amount corresponding to the capacity of cavity means the real ratio of loading weight corresponding to theorical weight at the time of loading resin weight to cavity volume. Then, the loading volume of foaming materials is equal or more than the volume of cavity and the expansion ratio is set less than 1.3 times. Backlash or swirl mark on the surface or inside void is not generated on a dielectric lens 13 provided like this at all. Besides, the dielectric constant at each part of the lens 13 is almost fixed as a whole.
NONOGAKI YUTAKA
NAKAMURA TATSUHIRO
| JPH066126A | 1994-01-14 | |||
| JPH0243260A | 1990-02-13 | |||
| JPH0479403A | 1992-03-12 | |||
| JPH04326605A | 1992-11-16 | |||
| JPH0548318A | 1993-02-26 | |||
| JPH03104402A | 1991-05-01 | |||
| JPS53136700A | 1978-11-29 | |||
| JPS408577B1 |
Next Patent: MICROSTRIP ARRAY ANTENNA