Method for producing molding die for synthetic resin lens barrel

Details Method for producing molding die for synthetic resin lens barrel Method for producing molding die for synthetic resin lens barrel

1998-03-10

2000-09-19

Dye, Rena L.

Stock material or miscellaneous articles

Hollow or container type article

Polymer or resin containing

428 3691, 359694, 359700, 359819, 359823, 411307, 411308, 411312, G02B 700

Patent

active

061208655

ABSTRACT:
An inner barrel includes a male helicoid, and an outer barrel includes a female helicoid which can engage with the male helicoid of the inner barrel. The included angle of trapezoidal threads of the male helicoid are identical to an included angle of trapezoidal grooves of the female helicoid in a section perpendicular to a direction of an extension of the threads.

REFERENCES:
patent: 4304463 (1981-12-01), Tomori
patent: 4385023 (1983-05-01), Sumi
patent: 5097586 (1992-03-01), Sawyer
patent: 5144493 (1992-09-01), Nomura
patent: 5276318 (1994-01-01), Hirasawa
patent: 5347192 (1994-09-01), Mukohjima et al.
patent: 5461443 (1995-10-01), Nakayama et al.
patent: 5796062 (1998-08-01), Nomura et al.
Copy of a United Kingdom Search Report dated Mar. 31, 1998.
Copy of a Preliminary French Search Report issued Apr. 24, 1998.
Patent Abstracts of Japan vol.14 No. 307 (M-0993), Jul. 3, 1990.
Patent Abstracts of Japan, vol. 18, No. 598(M-1704), Nov. 15, 1994.

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