A control device includes: an acquisition unit configured to acquire first and second image signals generated by an imaging device having an autofocus function by capturing an observation target irradiated with first light and second light having different wavelength bands, respectively; a signal processor configured to detect detection information of the first and second image signals; and a controller configured to calculate a first focal length based on the detection information of the first image signal, calculate a second focal length based on the detection information of the second image signal, and set a focal length of the imaging device to capture the observation target irradiated with the second light to either the first or second focal length at least based on the detection information of the second image signal.

A drive device includes a filter section that includes an optical filter, a transmission section that rotates around a rotation shaft, a first groove portion that is formed to the transmission section, a protruding portion that is formed to the filter section, in contact with the first groove portion, and that moves the filter section from a first position to a second position by moving along the first groove portion in coordination with rotation of the transmission section, and a second groove portion that is formed continuously with the first groove portion, and that is provided along a tangent line direction passing through the protruding portion that is on a circle having the rotation shaft of the transmission section at a center and a radius that is a distance between the rotation shaft and the protruding portion, when the optical filter section is moved to the second position.

There are provided a light source device, which is more compact and inexpensive than a known light source device, and an endoscope system having a compact and inexpensive light source device. In a light source device, a light source unit includes a first light source that emits blue light, a second light source that emits broadband green light including not only a green component but also a red component, and an optical filter that adjusts the amount of broadband green light for each wavelength. The optical filter has a characteristic in which the reflectance of the green component is smaller than the reflectance of the red component in the case of reflecting the broadband green light or a characteristic in which the transmittance of the green component is smaller than the transmittance of the red component in the case of transmitting the broadband green light.

The invention provides medical or industrial light source devices, for example, an endoscope.

A light source device includes: a light source emitting a light beam; a concentrator including a pair of Fresnel lenses with corrugated surfaces and concentrating the emitted light beam, the corrugated surfaces of the Fresnel lenses facing each other, and a light guide guiding the concentrated light beam.

The corrugated surfaces of the pair of Fresnel lenses may be in contact with each other and one end of the light guide may be disposed at a focal point of the concentrated light beam.

Provided is an optical fiber scanner capable of generating an image with excellent image quality, which displaces an emission end of an optical fiber by means of an optical scanning actuator and scans light emitted from the optical fiber, in which the optical fiber 31 includes a photonic crystal fiber at least in a propagation path of the light leading to the optical scanning actuator.

There is provided a camera head for endoscope which enables to achieve a favorable fluorescent image in any wavelength band when the observation is switched over from a normal white-light image observation to an observation of fluorescent images of different wavelength bands.

The camera head for endoscope includes a camera-head optical system which includes a spectral prism having a dichroic film which splits light from the endoscope into white light and fluorescent light, and a first image pickup element and a second image pickup element which are disposed in respective optical paths split into two by the spectral prism, and the first image pickup element is for the white-light image observation in which a white-light image is captured, and the second image pickup element is for a fluorescent-image observation in which two fluorescent images of different wavelengths are captured, and the first image pickup element is disposed at a position at which an image is formed in an optical path for the white-light image observation, and the second image pickup element is disposed at a position between two positions at which the two fluorescent images are formed in an optical path for the fluorescent-mage observation, and the camera head for endoscope satisfies the following conditional expression (1).

d≦9×P×Fno  (1)

Exemplary apparatus, systems, methods of making, and methods of using a configuration in an optical arrangement for spectrally encoded endoscopy (SEE) probe can be provided. For example, the probe can comprise a fixed guiding portion and a rotatable dispersive portion.

A cylindrical actuator sub-assembly (100, 200, 300) comprising: an element (14, 24, 34) movable along a longitudinal axis (A), at least one actuating member and a guidance mechanism suitable for guiding the element, wherein aid guidance mechanism includes a first ring-shaped lever (11, 21, 31) and a second ring-shaped lever (11′, 21′, 31′) that are parallel to each other, at least two straight axial flexures (12, 12′; 22, 22′; 32, 32′), at least two flexures (16, 16′; 27, 27′; 36, 36′) and at least two bases (13, 13′; 23, 23′; 33, 33′), a first base carrying the movable element.

A dynamic imaging system of an endoscope that adjusts path length differences or focal points to expand a usable depth of field. The imaging system utilizes a variable lens to adjust the focal plane of the beam or an actuated sensor to adjust the detected focal plane. The imaging system is thus capable of capturing and adjusting the focal plane of separate images captured on separate sensors. The separate light beams may be differently polarized by a variable wave plate or a polarized beam splitter to allow separate manipulation of the beams for addition of more frames. These differently focused frames are then combined using image fusion techniques.

A scanner includes a lens assembly comprising a lens having a lens axis and a positioning system to adjust a focal plane of the lens assembly. The positioning system includes an outer element, an inner element coupled to the lens assembly, and a linear-motion bearing that couples the inner element to the outer element.