| 摘要 |
PROBLEM TO BE SOLVED: To provide a center position display device for light irradiation range which can easily correct the sight. SOLUTION: A plurality of photodetectors 1 are arranged on a plane to be irradiated with light by (n) each at an equal interval in the horizontal direction (x) and in the vertical direction (y)... in a(n)×(n) matrix array. High luminance LEDs 6 are arranged on the plane to be irradiated with light by 2n-1 each at equal intervals a half as much as the interval of the photodetectors in the horizontal direction (x) and in the vertical direction (y)... in a matrix array of (2n-1)×(2n-1). The high luminance LEDs 6 located at the center position in an irradiation range of the light detected by a CPU are made to emit light based on outputs of the plurality of photodetectors. This enables directly judgment of the center position in the irradiation range of the light, thereby facilitating the correction of the sight.
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