Electronic endoscope apparatus outputting ternary drive signal
First Claim
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1. An electron endoscope apparatus comprising:
- an electron endoscope having an elongated portion to be inserted, an objective optical system disposed at the front portion of said portion to be inserted, a solid imaging device constituted by a photo-electrical conversion portion for photo-electrically converting an optical image formed by said objective optical system and a charge detection circuit for converting a signal charge which has been photo-electrically converted by said photo-electrical conversion portion into a voltage level so as to output said voltage level, and light irradiating means disposed at said front portion of said portion to be inserted and for irradiating illumination light for illuminating a subject;
a signal processing circuit having a binary signal generating circuit means for generating a sole binary signal, a multi-valued drive signal generating circuit means for generating a multi-valued drive signal exceeding a trinary value for commonly conducting both a horizontal transfer of said signal charge of said photo-electrical conversion portion and a resetting of said charge detection circuit with said binary signal and for causing said solid imaging device to output a signal containing a feed-through signal period, a signal extraction circuit for extracting a signal component by making a reference with a signal level in said feed-through signal period with said signal transmitted from said solid imaging device, and a video signal processing circuit for generating a standard video signal by processing a signal transmitted from said signal extraction circuit; and
display means for displaying said standard video signal transmitted from said signal processing circuit.
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Abstract
An endoscope apparatus is disclosed in which the horizontal transfer of the charge of a solid imaging device such as a CCD and the resetting for the detection of the charge are conducted by a common drive signal. The signal transmitted from the solid imaging device is caused to contain a feed-through period by making the drive signal to be served by a multi-valued level horizontal transfer signal exceeding a trinary value. Therefore, reset noise or the like can be eliminated by processing the output signal by using a correlated double sampling circuit or the like so that a video signal exhibiting a good S/N ratio can be obtained.
75 Citations
37 Claims
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1. An electron endoscope apparatus comprising:
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an electron endoscope having an elongated portion to be inserted, an objective optical system disposed at the front portion of said portion to be inserted, a solid imaging device constituted by a photo-electrical conversion portion for photo-electrically converting an optical image formed by said objective optical system and a charge detection circuit for converting a signal charge which has been photo-electrically converted by said photo-electrical conversion portion into a voltage level so as to output said voltage level, and light irradiating means disposed at said front portion of said portion to be inserted and for irradiating illumination light for illuminating a subject; a signal processing circuit having a binary signal generating circuit means for generating a sole binary signal, a multi-valued drive signal generating circuit means for generating a multi-valued drive signal exceeding a trinary value for commonly conducting both a horizontal transfer of said signal charge of said photo-electrical conversion portion and a resetting of said charge detection circuit with said binary signal and for causing said solid imaging device to output a signal containing a feed-through signal period, a signal extraction circuit for extracting a signal component by making a reference with a signal level in said feed-through signal period with said signal transmitted from said solid imaging device, and a video signal processing circuit for generating a standard video signal by processing a signal transmitted from said signal extraction circuit; and display means for displaying said standard video signal transmitted from said signal processing circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A solid imaging device signal processing apparatus for reading a signal and processing said read signal from a solid imaging device having a photo-electrical conversion means for conducting a photo-electrical conversion and a charge detection circuit for transmitting a signal charge stored in said photo-electrical conversion portion as a signal whose voltage level corresponds to a quantity of said signal charge,
said solid imaging device signal processing apparatus comprising: -
a solid imaging device drive circuit having a binary signal generating circuit means for generating a sole binary signal, a vertical transfer signal generating circuit means for transmitting a vertical transfer signal for a vertical transfer to said photo-electrical conversion portion with said binary signal, and a horizontal transfer signal generating circuit means for commonly transmitting a multi-valued horizontal transfer signal exceeding a trinary value for causing said charge detection circuit and said photoelectrical conversion portion to transmit a signal containing a feed-through signal period; a signal extraction circuit for extracting a signal component in a signal period, in which a signal component which corresponds to said signal charge is transmitted, with reference to a signal level of said feed-through signal period with respect to a signal transmitted from said solid imaging device by said multi-valued horizontal transfer signal; and a video signal processing circuit for generating a standard video signal by processing said signal transmitted from said signal extraction circuit. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31)
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32. A solid imaging device drive circuit for reading a signal from a solid imaging device having a photo-electrical conversion means for conducting a photo-electrical conversion and a charge detection circuit for transmitting a signal charge stored in said photo-electrical conversion portion as a signal whose voltage level corresponds to a quantity of said signal charge,
said solid imaging device signal processing apparatus comprising: -
a binary signal generating circuit for generating a sole binary signal; a vertical transfer signal generating circuit means for transmitting a vertical transfer signal for a vertical transfer to said photo-electrical conversion portion with said binary signal; and a horizontal transfer signal generating circuit means for commonly transmitting a multi-valued horizontal transfer signal exceeding a trinary value for causing said charge detection circuit and said photo-electrical conversion portion to transmit a signal containing a feed-through signal period. - View Dependent Claims (33, 34, 35, 36, 37)
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Specification