Optical element manufacturing method, optical element, optical apparatus, and image capturing apparatus
A method of manufacturing an optical element includes preparing a first transparent base having a d-line refractive index of 1.80 or more and a second transparent base having a d-line refractive index of 1.80 or more, coating an adhesive on the first transparent base and/or the second transparent base, the adhesive containing a photo-curable resin and a photopolymerization initiator having an absorption edge wavelength of 410 nm or more, and bonding the first transparent base and the second transparent base by irradiating the adhesive with light with a wavelength of 400 nm or more through the second transparent base to cure the adhesive.
1. A method of manufacturing an optical element, comprising:
preparing a first transparent base having a d-line refractive index of 1.80 or more and a second transparent base having a d-line refractive index of 1.80 or more;
coating an adhesive on the first transparent base and/or the second transparent base, the adhesive containing a photo-curable resin and a photopolymerization initiator having an absorption edge wavelength of 410 nm or more; and
bonding the first transparent base and the second transparent base by irradiating the adhesive with light with a wavelength of 400 nm or more through the second transparent base to cure the adhesive.
2. The method of manufacturing the optical element according to claim 1 , wherein the d-line refractive index of the second transparent base is more than or equal to 1.90.
3. The method of manufacturing the optical element according to claim 1 , wherein a content of the photopolymerization initiator contained in the adhesive is in a range from 0.5 mass % to 5.0 mass %.
4. The method of manufacturing the optical element according to claim 1 , wherein the photopolymerization initiator comprises at least one of IRGACURE 819 (bis(2,4,6-trimethylbenzoyl)phenylphosphine oxide) or IRGACURE TPO (diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide).
5. The method of manufacturing the optical element according to claim 4 , wherein the photopolymerization initiator further comprises IRGACURE 184 (1-Hydroxycyclohexyl)phenyl ketone).
6. The method of manufacturing the optical element according to claim 5 , wherein a content of the IRGACURE 184 (1-Hydroxycyclohexyl)phenyl ketone) is in a range from 50 mass % to 250 mass % with respect to either the IRGACURE 819 (bis(2,4,6-trimethylbenzoyl)phenylphosphine oxide) or the IRGACURE TPO (diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide).
7. The method of manufacturing the optical element according to claim 5 , wherein the first transparent base and the second transparent base are selected from the group consisting of transparent resin and transparent glass.
8. The method of manufacturing the optical element according to claim 7 , wherein the first transparent base and the second transparent base are selected from the group consisting of silica glass, borosilicate glass, and phosphate glass, quartz glass, and glass ceramics.
9. The method of manufacturing the optical element according to claim 8 , wherein the wavelength of the light with which the adhesive is irradiated is more than 400 nm.
10. The method of manufacturing the optical element according to claim 7 , wherein the wavelength of the light with which the adhesive is irradiated is more than 400 nm.
11. The method of manufacturing the optical element according to claim 1 , wherein the photopolymerization initiator comprises IRGACURE TPO (diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide).
12. The method of manufacturing the optical element according to claim 11 , wherein the photopolymerization initiator further comprises at least one of IRGACURE 819 bis((2,4,6-trimethylbenzoyl)phenylphosphine oxide) and IRGACURE 184 (1-Hydroxycyclohexyl)phenyl ketone).
13. The method of manufacturing the optical element according to claim 12 , wherein the first transparent base and the second transparent base are selected from the group consisting of transparent resin and transparent glass.
14. The method of manufacturing the optical element according to claim 13 , wherein the first transparent base and the second transparent base are selected from the group consisting of silica glass, borosilicate glass, and phosphate glass, quartz glass, and glass ceramics.
15. The method of manufacturing the optical element according to claim 14 , wherein the wavelength of the light with which the adhesive is irradiated is more than 400 nm.
16. The method of manufacturing the optical element according to claim 13 , wherein the wavelength of the light with which the adhesive is irradiated is more than 400 nm.
17. The method of manufacturing the optical element according to claim 1 , wherein the adhesive has an internal transmittance of 99% or more.
18. The method of manufacturing the optical element according to claim 1 , wherein an Abbe constant of the first transparent base is in a range from 10 to 35, and an Abbe constant of the second transparent base is in a range from 10 to 35.