| 摘要 |
PURPOSE:To prevent the effect of the fluctuation of the scanning speed, by giving correction to the fluctuation of the input signal level which is caused by the fluctuation of one scanning time of the hand scanner. CONSTITUTION:Controller 62 is supplied start pulse ST to produce holding signal, and thus holds the output of integral network 63 to sample holder 64. Furthermore, circuit 63 is reset to secure the integration from the O level to the next reset command. Accordingly, the holding voltage of holder 64 features the value proportional to the storage time. And if this holding voltage is converted into the signal corresponding to the reciprocal value through divider circuit 65, the correction signal is obtained. Then video signal VO with the fluctuation of the scanning speed received is supplied to one input terminal of analog multiplier 61; and the correction signal is supplied to the other input terminal each. Thus normal signal VON with correction given to the fluctuation of the scanning speed is delivered to the output end of the terminal. In such way, a copy free from uneven density can be obtained. |
