Shaping method of light guide plate
A technology of light guide plate and injection molding, which is applied in the direction of optics, light guides, optical components, etc., can solve the problems of shortened forming cycle time, long forming time, and time-consuming extraction, and achieve the effect of shortening the forming cycle time
Inactive Publication Date: 2008-10-22
MEIKI
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Problems solved by technology
In addition, since the extraction method described in Patent Document 1 is a method of taking out the light guide plate from between the two tie rods on the upper side and moving it to another mounting position, there is a problem in shortening the molding cycle time.
Therefore, in Patent Document 1, 40 seconds or more is required for one molding cycle time
In addition, regarding the molding cycle time of the small light guide plate, in order to carry out the transfer molding of the pattern, the above-mentioned molding time is very long, and it takes time to take it out. There is also a problem with shortening
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[0041] refer to Figure 1 to Figure 13 The injection compression molding die for the light guide plate of the present invention will be described. figure 1 It is a front view looking at the take-out device of the light guide plate of this embodiment from the movable platen side toward the fixed platen side. figure 2 It is a side view of the take-out device of the light guide plate of this embodiment. 3 is an enlarged perspective view of main parts of the light guide plate take-out device according to the present embodiment. FIG. 4 is a cross-sectional view of an injection compression molding die for a light guide plate used in this embodiment. Figure 5 7 to 7 are graphs showing the injection compression molding method of the light guide plate of this embodiment. Figure 8 It is an enlarged cross-sectional view of the sprue bushing of the injection compression molding mold of the light guide plate according to the present embodiment. 9 to 13 are diagrams showing the relat...
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Abstract
The invention provides a forming method for a light guide plate, which can shorten takeout time and forming time of the light guide plate when forming the light guide plate via the injection forming comprising injection compression forming, so as to shorten the forming circulation time. In the forming method that forms the light guide plate within a die via the injection forming, a half circulation from completion of a closed die, through injection, to the start of an opened die are performed in the range from 1.75 to 6 seconds, and the other circulation from the start of the opened die, through the takeout of the light guide plate, to the completion of the closed die is performed in the range from 0.75 to 2.2 seconds, therefore the forming circulation time can be shortened.
Description
technical field [0001] The present invention relates to a molding method of a light guide plate in which a light guide plate is formed in a mold by injection molding including injection compression molding, and particularly relates to a method of molding a light guide plate with a diagonal dimension of 7 inches or less used in mobile phones and the like. Background technique [0002] A method described in Patent Document 1 is known as a molding method / extraction method of a light guide plate by injection molding including injection compression molding. Patent Document 1 relates to the molding of large-sized light guide plates. Generally, in the case of molding these large-sized light guide plates, only the molding time (the time from completion of mold closing and injection to start of mold opening) requires more than 30 seconds. In addition, since the extraction method described in Patent Document 1 is a method of taking out the light guide plate from between the two upper ...
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IPC IPC(8): B29C45/76B29C45/40B29C45/42B29C45/73G02B6/00B29L11/00
Inventor 蛯名利幸
Owner MEIKI