Abstract: A light source device for an electronic endoscope includes a light source that emits light having a visible light wavelength region and an optical filter that has transmission peaks at a plurality of particular wavelengths in a continuous wavelength region including the visible light wavelength region. The plurality of particular wavelengths include wavelengths of around 420 nm, around 550 nm and around 650 nm. The optical filter has a constant transmissivity higher than zero and lower than a half of each of the transmission peaks in a wavelength region between the transmission peaks and the constant transmissivity in the wavelength region between the transmission peaks is higher than a transmissivity in a wavelength region other than between the transmission peaks.

Abstract: An electronic endoscope system includes a light source that emits light having a visible light wavelength region, and an optical filter that has transmission peaks at least at two particular wavelengths in a continuous wavelength region including the visible light wavelength region. The optical filter has a transmissivity that suppresses a light amount cut by the optical filter between the transmission peaks of the at least two particular wavelengths and has a transmissivity of zero at a wavelength region other than an interval between the transmission peaks of the at least two particular wavelengths. A solid-state image pick-up receives reflected light from an object which is irradiated with illumination light via the optical filter and an image generator is configured to generate a color image to be displayed on a monitor by processing an image signal output by the solid-state image pick-up.

Abstract: A light source device for an electronic endoscope includes a light source that emits light having a visible light wavelength region and an optical filter that has transmission peaks at a plurality of particular wavelengths in a continuous wavelength region including the visible light wavelength region. The plurality of particular wavelengths include wavelengths of around 420 nm, around 550 nm and around 650 nm. The optical filter has a constant transmissivity higher than zero and lower than a half of each of the transmission peaks in a wavelength region between the transmission peaks and the constant transmissivity in the wavelength region between the transmission peaks is higher than a transmissivity in a wavelength region other than between the transmission peaks.

Abstract: An electronic endoscope system includes a light source that emits light having a visible light wavelength region, and an optical filter that has transmission peaks at least at two particular wavelengths in a continuous wavelength region including the visible light wavelength region. The optical filter has a transmissivity that suppresses a light amount cut by the optical filter between the transmission peaks of the at least two particular wavelengths and has a transmissivity of zero at a wavelength region other than an interval between the transmission peaks of the at least two particular wavelengths. A solid-state image pick-up receives reflected light from an object which is irradiated with illumination light via the optical filter and an image generator is configured to generate a color image to be displayed on a monitor by processing an image signal output by the solid-state image pick-up.

Abstract: An electronic endo scope system includes a light source that emits light including at least a visible light band, an optical filter that has a transmittance peak at a particular wavelength within a continuous wavelength band including at least the visible light band and that has a transmittance distribution which is based on the transmittance peak within an entire of the continuous wavelength band except the transmittance peak, an optical filter switching unit that inserts and retracts the optical filter into and out of an illumination optical path of the light source, a color solid state image pick-up device that receives reflected light from a subject illuminated with illumination light which has passed, or not passed, through the optical filter, and an image generating unit that generates a color image displayable on a monitor by processing an imaging signal output by the solid state image pick-up device.

Abstract: An electronic endoscope system, including: a light source that emits light having a visible light wavelength region; an optical filter that has transmission peaks at least at two particular wavelengths in a continuous wavelength region including the visible light wavelength region and has a transmissivity higher than zero and lower than a half of each transmission peak between the transmission peaks of the at least two particular wavelengths, the optical filter having a transmissivity of zero at a wavelength region other than an interval between the transmission peaks of the at least two particular wavelengths; a solid-state image pick-up device that receives reflected light from an object which is irradiated with illumination light via the optical filter; and an image generation unit configured to generate a color image to be displayed on a monitor by processing an image signal outputted by the solid-state image pick-up device.

Abstract: An electronic endoscope system, including: a light source that emits light having a visible light wavelength region; an optical filter that has transmission peaks at least at two particular wavelengths in a continuous wavelength region including the visible light wavelength region and has a transmissivity higher than zero and lower than a half of each transmission peak between the transmission peaks of the at least two particular wavelengths, the optical filter having a transmissivity of zero at a wavelength region other than an interval between the transmission peaks of the at least two particular wavelengths; a solid-state image pick-up device that receives reflected light from an object which is irradiated with illumination light via the optical filter; and an image generation unit configured to generate a color image to be displayed on a monitor by processing an image signal outputted by the solid-state image pick-up device.

Abstract: An endoscopic apparatus has an objective optical system arranged in a rigid endoscope for forming an image, a first image re-forming optical system for re-forming a part of the image once formed through the objective optical system on an image pickup surface of a first CCD camera and a second image re-forming optical system which re-forms an image once formed through an objective optical system on an image pickup surface of a second CCD camera. A second monitor displays the image picked up by the second CCD camera added with a rectangular frame indicating size and amplitude of the area corresponding to the image picked up by the first CCD camera.

Abstract: The stereoscopic microscope includes a common close-up optical system that faces an object, a pair of zoom optical systems that form a pair of primary image, a pair of field stops, a pair of relay optical systems that relay the primary images to form a pair of secondary images, an inter-axis distance reducing element, an image taking device and an illuminating optical system. The object light rays incident on the close-up optical system form the primary images having predetermined parallax at the field stops through the zoom optical systems. The inter-axis distance reducing element reduces the inter-axis distance of the right and left light rays. The primary images are re-imaged by the relay optical systems as the secondary images on the adjacent regions on the single image taking surface of the image taking device, respectively.

Abstract: The stereoscopic microscope includes a common close-up optical system that faces an object, a pair of zoom optical systems that form a pair of primary image, a pair of field stops, a pair of relay optical systems that relay the primary images to form a pair of secondary images, an inter-axis distance reducing element, an image taking device and an illuminating optical system. The object light rays incident on the close-up optical system form the primary images having predetermined parallax at the field stops through the zoom optical systems. The inter-axis distance reducing element reduces the inter-axis distance of the right and left light rays. The primary images are re-imaged by the relay optical systems as the secondary images on the adjacent regions on the single image taking surface of the image taking device, respectively.

Abstract: An endoscopic apparatus has an objective optical system arranged in a rigid endoscope for forming an image, a first image re-forming optical system for re-forming a part of the image once formed through the objective optical system on an image pickup surface of a first CCD camera and a second image re-forming optical system which re-forms an image once formed through an objective optical system on an image pickup surface of a second CCD camera. A second monitor displays the image picked up by the second CCD camera added with a rectangular frame indicating size and amplitude of the area corresponding to the image picked up by the first CCD camera.

Abstract: A thermographic endoscope having an insert part that is inserted into a body cavity. The thermographic endoscope includes an infrared image forming device disposed in the distal end of the insert part so as to form an infrared image of a part under inspection, and a device for transmitting the infrared image formed by the infrared image forming device to the outside of the insert part. The thermographic endoscope further includes a device for converting the infrared image, which is transmitted by the infrared image transmitting device, into a visible image and for displaying the visible image, and a device for injecting low-temperature gas outwardly from the distal end of the insert part of the endoscope.