Cooling device of an injection mold for making an optical disk s

Details Cooling device of an injection mold for making an optical disk s Cooling device of an injection mold for making an optical disk s

1996-11-29

1998-07-21

Heitbrink, Tim

Plastic article or earthenware shaping or treating: apparatus

Female mold and charger to supply fluent stock under...

With means to heat or cool

264107, 26432816, 425548, 425552, 425810, B29C 4573

Patent

active

057832331

ABSTRACT:
A cooling device of an injection mold for an optical disk substrate reduces the chances of cavitation caused by a turbulent flow of passing cooling water, thus enabling a disk cavity plate to be cooled uniformly. A plurality of main arc-shaped passages, which have the same cross-sectional shape and which are concentrically arranged, are provided at a pitch "p" from the inner circumference on the rear surface of the disk cavity plate of the optical disk substrate injection mold. Further provided are a connecting arc-shaped passage having a radius of "p" which connects a first main arc-shaped passage having a radius of R.sub.1 with a second main arc-shaped passage having a radius of R.sub.2, and the centerline of which is tangentially connected to the second main arc-shaped passage, and which has the same cross-sectional shape; and a connecting segment-like passage, the centerline of which is tangentially connected to the connecting arc-shaped passage and the first main arc-shaped passage having the radius of R.sub.1, and which has the same cross-sectional shape. In a similar manner, main arc-shaped passages are connected one after another to constitute the cooling device of the injection mold for the optical disk substrate.

REFERENCES:
patent: 3181200 (1965-05-01), Joseph
patent: 4260360 (1981-04-01), Holmes et al.
"Injection Mold", Nikkan Kogyo Shimbunsha, 1973, p. 175.

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