Method for manufacturing infrared-transmissible lens, infrared-transmissible lens, and infrared camera

Patent metadata

Field	Value
Publication number	US-11155487-B2
Application number	US-201716091611-A
Country	US
Kind code	B2
Filing date	Apr 24, 2017
Priority date	Jul 20, 2016
Publication date	Oct 26, 2021
Grant date	Oct 26, 2021

Abstract

Provided is a method for manufacturing an infrared-transmissive lens having an excellent surface quality. A method for manufacturing an infrared-transmissive lens includes firing a preform of a chalcogenide glass in an inert gas atmosphere to obtain a fired body and then subjecting the fired body to hot press molding.

First claim

The invention claimed is:

1. A method for manufacturing an infrared-transmissive lens, the method comprising:
firing a preform of a chalcogenide glass in an inert gas atmosphere to obtain a fired body and then subjecting the fired body to hot press molding; wherein
a softening point of the chalcogenide glass is 250 to 370° C.; and
the preform is fired for six to twelve hours.

2. The method for manufacturing an infrared-transmissive lens according to claim 1 , wherein the preform is fired at a temperature 0 to 50° C. lower than a deformation point of the chalcogenide glass.

3. The method for manufacturing an infrared-transmissive lens according to claim 1 , wherein the preform is fired in a nitrogen atmosphere.

4. The method for manufacturing an infrared-transmissive lens according to claim 1 , wherein the fired body is subjected to the hot press molding at a temperature equal to or higher than a deformation point of the chalcogenide glass and equal to or lower than the softening point of the chalcogenide glass.

5. The method for manufacturing an infrared-transmissive lens according to claim 1 , wherein the fired body is subjected to the hot press molding in an inert gas atmosphere.

6. The method for manufacturing an infrared-transmissive lens according to claim 5 , wherein the fired body is subjected to the hot press molding in a nitrogen atmosphere.

7. The method for manufacturing an infrared-transmissive lens according to claim 1 , wherein the chalcogenide glass contains at least one of S, Se, and Te.

8. The method for manufacturing an infrared-transmissive lens according to claim 1 , wherein the chalcogenide glass contains S+Se+Te in an amount of 30 to 80% by mole.

9. The method for manufacturing an infrared-transmissive lens according to claim 1 , wherein the chalcogenide glass is substantially free of As.

Assignees

• Nippon Electric Glass Co

Inventors

• Matsushita Yoshimasa
• Sato Fumio

Classifications

• C03B11/00 Primary

  Pressing {molten} glass {or performed glass reheated to equivalent low viscosity without blowing (shaping molten glass by a press-blow process C03B9/00, e.g. C03B9/193; re-forming shaped glass C03B23/00; re-heating the performed glass C03B29/00; transporting the performed or pressed glass during its manufacture C03B35/00)} · CPC title

• C03C3/32

  Non-oxide glass compositions, e.g. binary or ternary halides, sulfides or nitrides of germanium, selenium or tellurium · CPC title

• C03B19/02

  by casting {molten glass, e.g. injection moulding} · CPC title

• G02B1/00

  Optical elements characterised by the material of which they are made; Optical coatings for optical elements · CPC title

• C03B11/08

  for making solid articles, e.g. lenses · CPC title