Manufacturing method of preform for precision press molding, optical device and its manufacturing method
A press molding and manufacturing method technology, applied in the direction of optical components, optics, manufacturing tools, etc., can solve problems such as volatilization, decline in blank quality, and difficulty in applying glass
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Examples
Embodiment 1
[0218] The glass raw materials mixed with a predetermined amount of batch materials are heated and melted, defoamed and clarified, and evenly stirred, and the obtained molten glass is continuously flowed down at a certain outflow speed from a platinum alloy nozzle that implements temperature control. At this time, the production amount of glass (引き上げ量) was 9.5 kg / day. Table 1 shows the composition and characteristics of the glass obtained from the above molten glass.
[0219] No.1
No.2
No.3
No.4
No.5
No.6
Glass
Glass
Group
become
you
%
Al(PO 3 ) 3
2
0
0
2
0
0
Ba(PO 3 ) 2
16
9
4
16
9
4
AlF 3
27
39
35
25
35
31
BiF 3
0
0
0
2
4
5
YF 3
1
3
1
1
3
1
MgF 2
11
4
...
Embodiment 2
[0231] The prepared glass raw material was heated and melted, defoamed and clarified, and evenly stirred, and the obtained molten glass, which was the same as in Example 1, flowed continuously at a certain outflow speed from the temperature-controlled platinum alloy outflow pipe. At this time, the production amount of glass was 8 kg / day.
[0232] The flow of molten glass flowing down through the image 3 The device shown is formed into a blank for compression molding.
[0233]The shield used in this embodiment is composed of two flat partition members. Make the above-mentioned partition parts close to each other, shield the gas and air flow from below, so that it does not blow to the front end of the outflow pipe, refer to the time when the molten glass drop drops from the front end of the outflow pipe, separate the partition parts from each other, and the molten glass drop Drops between the separated partition members to the molding die. Immediately after the molten glass ...
Embodiment 3
[0243] A blank was prepared in the same manner as in Example 2, except that the partition members constituting the shield were separated after the molten glass droplet was dropped onto the shield.
[0244] Make the two flat-shaped partition parts that constitute the shielding body close to each other, so as to shield the gas or air flow from below, so that it does not blow to the front end of the outflow pipe, and adjust the dropping position so that the molten glass drops from the outflow pipe. It falls to the position where the partition members are closely attached to each other, and then the molten glass is dripped from the front end of the outflow pipe in a closed space filled with dry gas.
[0245] After the molten glass drop is brought into contact with the partition members in a state of close contact, the molten glass drop is cooled to a certain extent, the partition members are separated from each other, and the molten glass drop is passed between the separated partit...
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