| 摘要 |
PROBLEM TO BE SOLVED: To suppress unevenness of a flexing rate of a lens material and to simply obtain a good imaging performance by providing a gate at an outer peripheral side face of a mold corresponding to a generating line direction of an anamorphic lens, injecting and molding an injection material. SOLUTION: An injection material is injected from a nozzle 2 in a cavity 1 for forming an anamorphic lens at a gate 2 disposed in a generating line of the lens as a boundary. The material is pressurized, cooled, solidified in the cavity 1, early started to be solidified at positions d, e far from the line direction as compared with another site, started latest to be completely charged and lastly started to be solidified at a position a near the gate 2. The solidification is started in order of d, e→c→b→a, its refractive index is unevenly formed in a flowing direction at a residue of a stress when a flowing state is set, different refractive indexes are provided at the positions a and d, e. A field angle is wide in the generating line direction. Since the portions d, e are not used, no influence is effected. Thus, unevenness of the index of the lens material is suppressed, thereby obtaining a good imaging performance.
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