Sampling pulse generator of electronic endoscope
First Claim
1. A sampling pulse generator utilized in an electronic endoscope which comprises an imaging device, comprising:
- a sampling circuit that samples image signals obtained by said image capturing device;
a driving-pulse generating processor that generates driving pulses for said imaging device;
a clock-pulse generator that cyclically generates clock pulses;
a shift counter that comprises a predetermined number of output terminals and that cyclically counts said clock pulses within said predetermined number, wherein count numbers have one-to-one correspondence with said output terminals and a signal is only output to a terminal corresponding to a current count number;
a first switch group that comprises switches connected to each of said output terminals;
a second switch group that comprises switches connected to each of said output terminals; and
a switch-setting processor that sets on-off states of said switches in said first and second switch groups;
wherein said driving-pulse generating processor generates said driving pulses by using signals from said output terminals of said shift counter and at least two types of sample pulses that control said sampling circuit are generated by using signals from said first and second switch groups of which said on-off states are set by said switch setting processor.
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Accused Products
Abstract
A sampling pulse generator for an electronic endoscope that comprises a CDS circuit, OR circuits, a clock pulse generator, a shift counter, first and second switch groups, EEPROM and a CPU, is provided. The generator cyclically generates clock pulses. The pulses are cyclically counted between 0 and 9 by the counter. The counter has ten output terminals that correspond to each of the count numbers. A signal is only output to a terminal corresponding to the current count number. Each of the first and second switch groups has ten switches that are connected to each of the terminals. With data in the EEPROM, the on-off states of the switches are set by the CPU. The CCD drive pulses are generated by signals from the terminals via OR circuits. The clamp pulse and sample-hold pulse are generated by signals from the switch groups which are set in the on state.
13 Citations
9 Claims
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1. A sampling pulse generator utilized in an electronic endoscope which comprises an imaging device, comprising:
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a sampling circuit that samples image signals obtained by said image capturing device;
a driving-pulse generating processor that generates driving pulses for said imaging device;
a clock-pulse generator that cyclically generates clock pulses;
a shift counter that comprises a predetermined number of output terminals and that cyclically counts said clock pulses within said predetermined number, wherein count numbers have one-to-one correspondence with said output terminals and a signal is only output to a terminal corresponding to a current count number;
a first switch group that comprises switches connected to each of said output terminals;
a second switch group that comprises switches connected to each of said output terminals; and
a switch-setting processor that sets on-off states of said switches in said first and second switch groups;
wherein said driving-pulse generating processor generates said driving pulses by using signals from said output terminals of said shift counter and at least two types of sample pulses that control said sampling circuit are generated by using signals from said first and second switch groups of which said on-off states are set by said switch setting processor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification