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    • 6. 发明专利
    • OPTICAL DEVICE FOR FOCUS DETECTION
    • JPS58160908A
    • 1983-09-24
    • JP4523682
    • 1982-03-19
    • CANON KK
    • SAKANE TOSHIOTAKAHASHI JIYUNICHIITOU YUUJI
    • A61B3/14G02B7/28G02B7/32
    • PURPOSE:To perform adequate focus detection even when an image of a body has deficient contrast by projecting a light and shade pattern for the focus detection on the body through a projection system. CONSTITUTION:Light from the halogen lamp 32 of a detection pattern projection system 31 is passed through an infrared-ray passing filter 32, condenser lens 32, detection mask 34 having light and shade patterns 34a and 34b, and projection lens 35 and then reflected by a wavelength splitting mirror R2, and its reflected light is passed through a relay lens 20 and reflected by a holed mirror 12 to form an image of the detection pattern on an eye ground Ef through an objective lens 11. Its reflected light after forming an image P temporarily through the objective lens 11 is passed through a diaphragm D, focusing lens 13a, and image reforming lens 13b and reflected by a wavelength splitting R1 to form images of the detection pattern on photoelectric converters 30a and 30b through an optical- path splitter 28 and cylindrical lenses 29a and 29b. So that both outputs may be equal to each other, the lens 13a and projection system 31 are moved through a signal processing circuit 38 and a motor M, performing proper focusing.