| 摘要 |
PURPOSE:To obtain said lens which is free from bad influence to image building performance of projected picture even if optical strain is formed when it is molded by injection molding, by molding an outer periphery circle like and arranging an injection gate, the contacting part of a pushout pin etc. at the position opposite to the edge of a picture frame. CONSTITUTION:E.g. an outer periphery is shaped like a circle, and an injection gate part 3 is shaped at the outside of the arc of the crescent like part 1a of which the string is the longer edge of a rectangular picture frame 2 and on the center line Y dividing the picture frame 2 into equal two parts right and left so as to be opposed to the longer edge of the picture frame 2 and a flow tub 4 is shaped at its antipode. Further by shaping the contacting parts 5 of pushout pins in mold release time at the outside of the arc of another crescent like part 1b and on the center line X dividing the picture frame 2 into equal two upper and lower parts so as to be opposed to the shorter edge of the picture frame 2 at the antipodes an aimed lens of which optical strain does not reach inside the picture frame 2 even if it is formed is obtained. Also, it is preferable that the lens is fitted to the predetermined position by using a lens fixing frame 10, because it is not shifted against the picture frame 2. |
