| 摘要 |
<p>A refracting power measuring apparatus according to the present invention comprises an optical system 1 for projecting a measuring light P toward a lens TL wet with liquid 12, a light receiving sensor 7 for receiving and outputting the measuring light P which passes through the lens TL, an arithmetic circuit 13 for calculating optical characteristic values based on a receiving signal, a residual quantity arithmetic circuit 14 for outputting a residual quantity signal based on characteristic value data of the arithmetic circuit 18, a delay circuit 19 for delaying the residual quantify signal, a comparing circuit 18 which compares a residual quantity signal delayed by the delaying circuit 19 and the following reeidual quantity signal and judges whether a difference therebetween is less than an allowed value.</p> |
