Multi-layer resin molded article and method of making the same

Details Multi-layer resin molded article and method of making the same Multi-layer resin molded article and method of making the same

1987-03-05

1989-02-21

Corbin, John K.

Plastic and nonmetallic article shaping or treating: processes

Outside of mold sintering or vitrifying of shaped inorganic...

Including plural heating steps

2643288, 350252, G02B 704

Patent

active

048059919

ABSTRACT:
When making a generally cylindrical article such as the barrel member of a lens barrel into a cylindrical molded article by the use of a resin material, a sandwich-molded article is formed by using a core layer resin material for the central layer of the molded article and surrounding the central layer by a skin layer resin material, the cylindrical molded article is a helicoid cylinder constituting the barrel, or a cylinder member provided with a toothed portion for receiving a drive force, or other barrel-constituting member, and the thickness of the skin layer resin material of the toothed portion of the helicoid cylinder or the barrel-constituting member is controlled.

REFERENCES:
patent: 2996764 (1961-08-01), Ross et al.
patent: 3599290 (1971-08-01), Garner
patent: 3690797 (1972-09-01), Garner
patent: 3873656 (1975-03-01), Garner
patent: 4103984 (1978-08-01), Mixon, Jr.
patent: 4174876 (1979-11-01), Tsuchihashi et al.
patent: 4309077 (1982-01-01), Tomori
patent: 4560237 (1985-12-01), Ohkura et al.

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