Title:
OPTICAL GLASS ELEMENT AND ITS PRODUCTION
Document Type and Number:
Japanese Patent JP3196952
Kind Code:
B2
Abstract:
PURPOSE: To economically obtain a high-precision optical glass element without annealing by obtaining the change in the refractive index of a glass due to press forming and using a glass material having a corrected refractive index obtained by compensating the refractive index of a product by the decrease or increase of the change.
CONSTITUTION: A glass material of previously selected composition is melted, heated and press-formed to produce the optical glass element by using the following means. Namely, an optical glass material having a refractive index obtained by subtracting the change in refractive index due to press forming from the refractive index required by a formed optical glass element is press- formed. This optical glass element forming method is effective when the change is controlled to 10×10-5 to 600×10-5 and very effective at ≥350×10-5.
Inventors:
Masaki Ohmori
Kiyoshi Yamamoto
Go Nomura
Masashi Mashige
Masayuki Tomita
Hiroe Tanaka
Maruyama Shizuo
Kiyoshi Yamamoto
Go Nomura
Masashi Mashige
Masayuki Tomita
Hiroe Tanaka
Maruyama Shizuo
Application Number:
JP10938894A
Publication Date:
August 06, 2001
Filing Date:
May 24, 1994
Export Citation:
Assignee:
Canon Inc
International Classes:
C03B11/00; C03B11/16; C03C3/00; C03C3/064; C03C3/068; C03C3/093; G02B3/00; (IPC1-7): C03B11/00; C03C3/068; C03C3/093; G02B3/00
Domestic Patent References:
| JP6221720A | ||||
| JP1133948A | ||||
| JP1138144A | ||||
| JP4357124A | ||||
| JP5246735A | ||||
| JP7330354A |
Attorney, Agent or Firm:
Johei Yamashita