Abstract: A power tool reduces performance deterioration. The power tool includes a motor, an output unit, a motor compartment, and a grip. The motor includes a rotor bearing and a rotor rotatable about a rotation axis extending in a front-rear direction. The rotor includes a rotor magnet, a core to which the rotor magnet is fixed, and a shaft protruding from an end face of the core and supported by the rotor bearing. The shaft and the core together are a single member. The output unit is at least partially located frontward from the motor and rotatable by the rotor. The motor compartment accommodates at least a part of the motor. The grip protrudes downward from the motor compartment.

Abstract: In the optical tomographic imaging apparatus according to an aspect of the present invention, since a stable light intensity can be secured for a reflected light beam of a measurement light beam reflected off of a transmitting surface of a probe outer casing as a returning light beam to an optical fiber, the optical path length difference between a reference light beam and the measurement light beam can be precisely adjusted by adjusting the optical path length of the reference light beam with an optical path length adjusting device. In addition, a signal of a measurement object can be reliably detected from a detection signal of an interference light beam detected by an interference light detecting device.

Abstract: An OCT probe has a sheath to be inserted into a subject; and an optical system within the sheath, for changing the direction of light which propagates from a light source through an optical fiber to irradiate the light onto the subject through a transparent portion of the sheath, and for reflecting the light beam, which is reflected by the subject, to guide the light into the optical fiber. A light output surface, for causing the light to be output from the reflecting surface in a direction obliquely inclined with respect to the inner surface of the sheath, and a reflected light sheath entrance preventing portion, for preventing light reflected by the inner surface of the sheath from entering the optical fiber, are provided in the optical system. The reflected light sheath entrance preventing portion may be formed by providing a cut planar surface portion on the lens.

Abstract: A polarization maintaining optical fiber, for guiding a measuring light beam, is provided within a probe. The probe is configured to be rotatable in the circumferential direction of the polarization maintaining optical fiber. A polarization direction rotator, for rotating the polarization direction of the measuring light beam that enters the polarization maintaining optical fiber accompanying rotation of the probe, is provided in order to maintain a state in which the polarization direction of the measuring light beam that enters the polarization maintaining optical fiber and the direction of the polarization axis of the polarization maintaining optical fiber are matched.

Abstract: In the optical tomographic imaging apparatus according to an aspect of the present invention, since a stable light intensity can be secured for a reflected light beam of a measurement light beam reflected off of a transmitting surface of a probe outer casing as a returning light beam to an optical fiber, the optical path length difference between a reference light beam and the measurement light beam can be precisely adjusted by adjusting the optical path length of the reference light beam with an optical path length adjusting device. In addition, a signal of a measurement object can be reliably detected from a detection signal of an interference light beam detected by an interference light detecting device.

Abstract: Light emitted from the light source unit divided into measuring light and reference light. An optical path length of the measuring light or the reference light is adjusted and a probe guides the measuring light to an object. The reflected light from the object when the measuring light is projected onto the object and the reference light are multiplexed. Interference light of the reflected light and the reference light which have been multiplexed is detected, and a tomographic image of the object is obtained on the basis of the interference light. The probe is provided with a distance measuring circuit for measuring the distance from the probe to the object, and the optical path length of the measuring light or the reference light is adjusted by the use of the distance to the object measured by the distance measuring circuit to adjust the tomographic image obtainment initiating position.

Abstract: When a tomographic image of an object in a body cavity is to be obtained by an optical coherence tomography measurement employing a probe, the distance between the probe and the object is measured and the optical path length of the measuring light or the reference light is adjusted.

Abstract: An OCT optical probe to be inserted into a subject includes: a cylindrical sheath to be inserted into a subject; an optical fiber disposed in the internal space of the sheath; a rotatably-supporting portion fixed to the optical fiber in the vicinity of a distal end of the optical fiber; a distal optical system to deflect light emitted from the distal end of the optical fiber toward the subject; a holding portion to hold the distal optical system such that the optical system is rotatably supported by the rotatably-supporting portion; and a flexible shaft covering the optical fiber in the internal space, wherein the holding portion is fixed to a distal end of the flexible shaft. Using the OCT optical probe of the invention, the problem of degradation of measurement accuracy due to optical insertion loss and optical reflection loss at a rotary joint can be eliminated inexpensively and safely.

Abstract: An OCT probe has a sheath to be inserted into a subject; and an optical system within the sheath, for changing the direction of light which propagates from a light source through an optical fiber to irradiate the light onto the subject through a transparent portion of the sheath, and for reflecting the light beam, which is reflected by the subject, to guide the light into the optical fiber. A light output surface, for causing the light to be output from the reflecting surface in a direction obliquely inclined with respect to the inner surface of the sheath, and a reflected light sheath entrance preventing portion, for preventing light reflected by the inner surface of the sheath from entering the optical fiber, are provided in the optical system. The reflected light sheath entrance preventing portion may be formed by providing a cut planar surface portion on the lens.

Abstract: A light source apparatus is equipped with at least three light sources each having a predetermined wavelength interval and different central wavelengths. At least one multiplexing means having wavelength selectivity, for multiplexing light emitted from each of a first group and a second group of the light sources is provided, the first group of light sources including odd ordered light sources and the second group of light sources including even ordered light sources when counted in order of lengths of the central wavelengths thereof. Multiplexing means not having wavelength selectivity, for multiplexing light emitted from the first group of light sources and the second group of light sources is also provided.

Abstract: A polarization maintaining optical fiber, for guiding a measuring light beam, is provided within a probe. The probe is configured to be rotatable in the circumferential direction of the polarization maintaining optical fiber. A polarization direction rotating means, for rotating the polarization direction of the measuring light beam that enters the polarization maintaining optical fiber accompanying rotation of the probe, is provided in order to maintain a state in which the polarization direction of the measuring light beam that enters the polarization maintaining optical fiber and the direction of the polarization axis of the polarization maintaining optical fiber are matched.

Abstract: An optical system includes semiconductor lasers arranged in the direction of the slow axis of the laser beam, an optical means which makes parallel the collimated laser beams, an optical member which is provided with inlet and outlet faces which are positioned in perpendicular to the optical axis of laser beams and total reflection surfaces which are opposed to each other at a space where the component in the direction of the slow axis of the laser beam entering from the light inlet face repeats internal reflection, and emits from the light outlet face a slow axis uniform laser beam, and an imaging optical means which images the slow axis uniform laser beam on a surface as a linear line beam extending in the direction of the slow axis.

Abstract: A light source apparatus is equipped with at least three light sources each having a predetermined wavelength interval and different central wavelengths. At least one multiplexing means having wavelength selectivity, for multiplexing light emitted from each of a first group and a second group of the light sources is provided, the first group of light sources including odd ordered light sources and the second group of light sources including even ordered light sources when counted in order of lengths of the central wavelengths thereof. Multiplexing means not having wavelength selectivity, for multiplexing light emitted from the first group of light sources and the second group of light sources is also provided.

Abstract: When a ratio R between a total angle ? of a widening angle in a median intensity of light of a light source (a GaN based semiconductor laser) and a total angle 2/? of a widening angle of light defining a numerical aperture NA of a collimator optical system (collimator lens) is defined as R=(sin?1NA)×2/?, the numerical aperture of the collimator optical system (collimator lens) is set so that 2.0?R?0.58. Thus, an image exposure device is provided that can suppress stray light of a light source that emits a large amount of stray light.

Abstract: When a tomographic image of an object in a body cavity is to be obtained by an optical coherence tomography measurement employing a probe, the distance between the probe and the object is measured and the optical path length of the measuring light or the reference light is adjusted.

Abstract: Light emitted from the light source unit divided into measuring light and reference light. An optical path length of the measuring light or the reference light is adjusted and a probe guides the measuring light to an object. The reflected light from the object when the measuring light is projected onto the object and the reference light are multiplexed. Interference light of the reflected light and the reference light which have been multiplexed is detected, and a tomographic image of the object is obtained on the basis of the interference light. The probe is provided with a distance measuring circuit for measuring the distance from the probe to the object, and the optical path length of the measuring light or the reference light is adjusted by the use of the distance to the object measured by the distance measuring circuit to adjust the tomographic image obtainment initiating position.

Abstract: An optical system includes semiconductor lasers arranged in the direction of the slow axis of the laser beam, an optical means which makes parallel the collimated laser beams, an optical member which is provided with inlet and outlet faces which are positioned in perpendicular to the optical axis of laser beams and total reflection surfaces which are opposed to each other at a space where the component in the direction of the slow axis of the laser beam entering from the light inlet face repeats internal reflection, and emits from the light outlet face a slow axis uniform laser beam, and an imaging optical means which images the slow axis uniform laser beam on a surface as a linear line beam extending in the direction of the slow axis.

Abstract: In an image exposing apparatus and an image exposing method, a deterioration of an image quality caused by stray light is suppressed, while both a sensitive level and a non-sensitive level are properly set in accordance with a type of photosensitive material. In the image exposing apparatus, a recording level setting unit calculates a recording level corresponding to a light amount level stored in a recording level light amount memory and sets the calculated recording level. A non-recording level setting unit calculates a non-recording level from an extinction ratio, which corresponds to a type of photosensitive material stored in a photosensitive material information memory, and the recording level. An output voltage setting unit sets an output voltage such that a detected voltage becomes equal to one of the recording level and the non-recording level.

Abstract: When a ratio R between a total angle ? of a widening angle in a median intensity of light of a light source (a GaN based semiconductor laser) and a total angle 2/? of a widening angle of light defining a numerical aperture NA of a collimator optical system (collimator lens) is defined as R=(sin?1NA)×2/?, the numerical aperture of the collimator optical system (collimator lens) is set so that 2.0?R?0.58. Thus, an image exposure device is provided that can suppress stray light of a light source that emits a large amount of stray light.

Abstract: When a ratio R between a total angle ? of a widening angle in a median intensity of light of a light source (a GaN based semiconductor laser) and a total angle 2/? of a widening angle of light defining a numerical aperture NA of a collimator optical system (collimator lens) is defined as R=(sin?1NA)×2/?, the numerical aperture of the collimator optical system (collimator lens) is set so that 2.0?R?0.58. Thus, an image exposure device is provided that can suppress stray light of a light source that emits a large amount of stray light.