Endoscope and endoscope system with optical phase modulation member
First Claim
1. An endoscope system comprising:
- an endoscope having a solid-state imaging device and an objective optical system that converges an object image on said solid-state imaging device, said objective optical system including an optical phase modulation member that exhibits a response of 0.2 or more derived from an optical transfer function relative to a spatial frequency on said solid-state imaging device determined based on the Nyquist theorem, that is, a Nyquist frequency, over a wider range of distances than a depth of field offered by an objective optical system not including the optical phase modulation member; and
a signal processing unit that processes an image signal produced by said endoscope so as to produce a video signal.
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Abstract
An endoscope system consists mainly of: an endoscope having a solid-state imaging device and an objective optical system that converges an object image on said solid-state imaging device; and a signal processing unit that processes an image signal produced by the endoscope so as to produce a video signal. The objective optical system includes an optical phase modulation member. The optical phase modulation member exhibits a response of 0.2 or more derived from an optical transfer function relative to a spatial frequency on the solid-state imaging device determined based on the Nyquist theorem, that is, a Nyquist frequency, over a wider range of distances than a depth of field offered by an objective optical system not having the optical phase modulation member.
85 Citations
19 Claims
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1. An endoscope system comprising:
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an endoscope having a solid-state imaging device and an objective optical system that converges an object image on said solid-state imaging device, said objective optical system including an optical phase modulation member that exhibits a response of 0.2 or more derived from an optical transfer function relative to a spatial frequency on said solid-state imaging device determined based on the Nyquist theorem, that is, a Nyquist frequency, over a wider range of distances than a depth of field offered by an objective optical system not including the optical phase modulation member; and a signal processing unit that processes an image signal produced by said endoscope so as to produce a video signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An endoscope system comprising:
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an endoscope having a solid-state imaging device and an objective optical system that converges an object image on said solid-state imaging device, said objective optical system including an optical phase modulation member that exhibits a response of 0.2 or more derived from an optical transfer function relative to a spatial frequency on said solid-state imaging device determined based on the Nyquist theorem, that is, a Nyquist frequency, over a wider range of distances than a depth of field offered by an objective optical system not including the optical phase modulation member; and a signal processing unit that processes an image signal produced by said endoscope so as to produce a video signal, said signal processing unit including an image processor that enhances components of the video signal, which is produced based on the image signal produced by said endoscope, falling within a specific frequency band. - View Dependent Claims (10, 11, 12, 13, 14)
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15. An endoscope system comprising:
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an endoscope having a solid-state imaging device and an objective optical system that converges an object image on said solid-state imaging device, said objective optical system including an optical phase modulation member that exhibits a response of 0.2 or more derived from an optical transfer function relative to a spatial frequency on said solid-state imaging device determined based on the Nyquist theorem, that is, a Nyquist frequency, over a wider range of distances than a depth of field offered by an objective optical system not having the optical phase modulation member; and a signal processing unit that processes an image signal produced by said endoscope so as to produce a video signal, said signal processing unit including a hue image processor that performs different kinds of image processing on red, green, and blue video signals produced based on the image signal produced by said endoscope. - View Dependent Claims (16, 17)
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18. An endoscope system comprising:
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an endoscope having a solid-state imaging device and an objective optical system that converges an object image on said solid-state imaging device, said objective optical system including an optical phase modulation means that transforms the phase of light, and exhibiting a response of 0.2 or more derived from an optical transfer function relative to a spatial frequency on said solid-state imaging device determined based on the Nyquist theorem, that is, a Nyquist frequency; and a signal processing unit that processes an image signal produced by said endoscope so as to produce a video signal.
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19. An endoscope, comprising:
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an imaging device for imaging an object; and an objective optical system that converges an object image on the imaging device; wherein the objective optical system includes an optical phase modulation member for performing optical phase modulation that exhibit a response of 0.2 or more derived from an optical transfer function relative to a Nyquist frequency on the imaging device.
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Specification