1959年,奥林巴斯光学工业株式会社的一位叫米谷美久的设计师设计出了一种拍摄画幅面积仅是35mm照相机24mm×36mm画幅规格一半的小型化照相机,其用35m m有孔胶卷可拍24mm×18mm画幅72张;因它拍摄的画面尺寸是35mm照相机画面的一半,故被称作“半格”或“半幅”照相机,型号命名叫做“PEN”。在奥林巴斯PEN型半幅旁轴平视取景照相机问世之后,奥林巴斯光学工业 In 1959, Miyuki Megumi, a designer at Olympus Optical Co., Ltd., designed a miniature camera that took half the size of a 24mm x 36mm format camera with a 35mm camera frame and used a 35m-m perforated film Can shoot 24mm × 18mm frame 72; because it shoot the screen size is 35mm camera screen half, it is called “half grid ” or “half width ” camera, model name is called “PEN ”. Olympus PEN-type half-way head-up camera looking after the horizon, the Olympus Optical Industry