Abstract: A correction device for an imaging optical arrangement exhibiting a light path (1), in particular for a microscope, that exhibits at least one plane-parallel transparent plate (9), which is held in a mounting plate in the image beam path (1) and is propelable around at least one axle in a tipping and/or a swiveling motion, in order in adjust a definite parallel misalignment of the beams in the image beam path (1) by a change in the tipping situation of the plate (9). A confocal microscope with such a correction device exhibits a confocal screen (4), which illustrates a specimen mark (10), whereby the plane-parallel plate (9) is placed in front of the detector unit (2) in the light path (1), in order to center the illustration of the aperture diaphragm on the detector unit.

Abstract: A lens unit includes a lens barrel for receiving at least one lens and a motor arranged to displace the lens barrel between various positions. Displacement of the lens barrel is proportional to an electrical signal applied to the motor. A first conductor is fixed to the lens barrel and is arranged to make electrical contact with a second conductor when the lens barrel is at an initial position. A processor is arranged to detect a change in the electrical contact, to determine an electrical signal at the time of the change and to generate an electrical signal corresponding to the desired displacement.

Abstract: A laser scanning microscope comprises: an objective lens for observing a specimen; a focal plane scan lens placed on the opposite side of the objective lens from the specimen and which generates an intermediate image; a mirror placed near to the position of the intermediate image of the focal plane scan lens; a scan unit scanning the mirror in the optical axis direction; and a pupil projection optical system which projects the pupil of the objective lens onto the pupil of the focal plane scan lens and of which the pupil projection magnification ratio is variable.

Abstract: An optical scanning observation apparatus having an internal focusing mechanism. suitable for in-vivo observation of animals, is provided. The optical scanning observation apparatus includes a light source, an objective optical system for focusing light onto the sample, a detection-light splitting device for splitting off collected detection light, a detector for detecting the focused detection light, a focus scanning device disposed between the detection-light splitting device and the objective optical system, and a lateral-direction scanning device, disposed between the focus scanning device and the objective optical system, for scanning the light in orthogonal directions relative to the optical axis. The focus scanning device further includes a focusing optical system having a positive and negative lens group and a lens driving device for moving one lens group to adjust the working distance of the objective optical system.

Abstract: A specimen imaging apparatus is provided that is capable of improved high-speed operation compared to conventional apparatuses. The specimen imaging apparatus is provided with a microscope for enlarging the image of a specimen, and taking the enlarged image of the specimen obtained by the microscope. The apparatus is provided with a vibration detector for detecting a relative vibration between the objective lens of the microscope and the specimen mounted in the microscope, a focuser for focusing before the vibration detected by the vibration detector has attenuated to less than a predetermined value, and a controller for determining whether or not a vibration detected by the vibration detector is less than a predetermined value. The specimen imaging apparatus is configured so as to take the enlarged image of a specimen when the controller has determined that the vibration is less than a predetermined value.

Abstract: The invention relates to an optical device (500) with a device (600) for increasing the depth of field having at least one optical element (3) with different focal lengths (f1, f2).

Abstract: It is possible to use the magnification of an objective lens as is, substantially without changing the observation magnification, even when the working distance of the objective lens is changed. The invention provides a focus-adjusting unit disposed on an optical axis between an objective optical system that collects light from a specimen and an image-forming optical system that images the light collected by the objective optical system at a prescribed position, comprising a front optical system and a back optical system, sequentially disposed along the optical axis direction from a front side, with the objective optical system serving at the front side and the image-forming optical system at the back; and a lens driving part that relatively moves these optical systems in the optical axis direction, wherein the front optical system and the back optical system have refractive powers of different sign and focal lengths of substantially equal absolute value.

Abstract: The invention is directed to an arrangement and a method for imaging depth-structured objects and for calibrating the imaging in connection therewith, preferably for generating stereoscopic images from different observation planes at different depth levels of an object. According to the invention, in an optical arrangement for imaging depth-structured objects comprising an entrance pupil, an aperture diaphragm, and a receiver surface positioned in the imaging beam path, at least one optical assembly which is displaceable in axial direction is provided between the aperture diaphragm and the receiver surface, and the displacement of this optical assembly within a predetermined length range causes a change in the focus position while the magnification remains the same.

Abstract: An apparatus for setting a divergence and/or convergence of a light beam includes at least one optical component for influencing the divergence and/or convergence of the light beam. A positioning device is provided for positioning the optical component. The positioning device includes at least one piezoelectric element.

Abstract: An adjustable microscope tube for a microscope includes, in this order, along its beam path coming from an entrance to the microscope tube: an optical system, which images a first intermediate image to infinity; at least one deflecting element, which folds the parallel beam path following the optical system, and collecting optics, arranged following the deflecting element in the beam path, for imaging the first intermediate image, which has been imaged to infinity, onto a second intermediate image, wherein the length of at least one portion of the folded, parallel beam path can be changed by displacement of the deflecting element relative to the optical system.

Abstract: Provided is a microscope for focusing by inserting a split prism (5) at a focusing support time. The image of an iris stop (30) is branched into such two images by the angle deflecting action of the split prism (5) as are individually shifted and focused at symmetric positions across the optical axis of the microscope. These two branched images of the iris stop (30) are further focused on an objective lens (23) through a beam splitter (22) by the focusing action of a lens (21). The operation unit of a vertical motion device is operated to move an optical system up and down so that the images of a focused pattern (16) are viewed to move in opposite directions from each other in the field of view. At the focusing time when the focal position of the objective lens (23) is focused on a sample face (24), the images of the focused pattern (15) look in the registered state. Thus, the focusing action can be made highly precise without being restricted by the magnification or NA of the objective lens.

Abstract: A microscope includes an adjustment device for positioning a specimen stage. An objective, an objective changer and/or an objective turret is coupled to the adjustment device so that a position of the objective element is adjustable by the adjustment device. A holder for the objective element may be provided coupling the objective element to the adjustment device.

Abstract: The invention relates to an epi-illumination optical system for microscopes which relies upon a Köhler illumination system using a collective lens array, having simplified adjustment function capable of adjusting the image position of a light source to the back focal position of each microscope objective lens in operable association with microscope objective lens replacement. The invention provides an epi-illumination optical system for microscopes, with an objective lens serving as a condenser lens, which comprises a light source, a collimate lens, and a lens array. The epi-illumination optical system further comprises a projection optical system adapted to project an image of light source formed by collective lens array.

Abstract: Copying of visual images by electronic devices is discouraged by metamerically altering the relative weights of the color components forming the visual images in a manner that is not perceptible to the human eye but which is perceptible in the copy. In a preferred technique, the visual images are represented by more than three primary color components whose relative values are varied in this manner. A primary application is to discourage copying by video cameras of movies displayed on theater movie screens, by causing the copies to contain unacceptable spatial or temporal variations in colors perceived by the human eye.

Abstract: A clear image having suppressed blurring due to pulsing is obtained by in-vivo examination of biological tissue or various internal organs of mammals, including small laboratory animals.

Abstract: An objective lens can be reduced in diameter, which allows examination inside a specimen such as a living organism with minimum invasiveness and also reduces costs. The invention provides a microscope apparatus including an objective-lens mounting part for removably mounting an objective lens unit; an apparatus main body for supporting the objective-lens mounting part so as to be movable in the optical axis direction; and an urging mechanism, disposed between the apparatus main body and the objective-lens mounting part, for urging the objective-lens mounting part towards the tip of the objective lens unit relative to the apparatus main body.

Abstract: An ophthalmic surgical microscope system (100) includes a surgical microscope (101). The surgical microscope (101) is accommodated on a carrier unit (109) so as to be adjustable in elevation in order to be able to adjust a work distance (124) between the surgical microscope (101) and a patient eye (120). A first drive (112) is provided for adjusting the elevation of the surgical microscope (101). The ophthalmic surgical microscope system (100) includes an ophthalmic ancillary module (114) having an adjustable ophthalmic magnifier lens (116). The work distance (125) between ophthalmic magnifier lens (116) and the patient eye (120) can be adjusted with a second drive (117). A drive coupling (123) is provided which couples the first drive for adjusting elevation of the surgical microscope (101) to the second drive (117) for adjusting the ophthalmic magnifier lens (116).

Abstract: An end face of a narrow-diameter end portion is easily disposed at a correct position on an examination object without setting an examination site, thus enabling rapid and straightforward acquisition of an image of the examination site. The invention provides an alignment method for a guiding device which is attached to an end of an objective lens in such a manner as to be capable of positional adjustment in an optical axis direction and which is brought into contact with an examination target to make a focal position of the objective lens coincident with an examination site.

Abstract: A device for shifting the imaging axis of a microscope across the endfaces of a multi-fiber connector for inspecting the fiber-optic endfaces through the microscope comprises a supporting body for attaching at one end to the optical tube of a microscope; a pendular arm rotatably mounted to another end of the supporting body; a fitting tip attached to another end of the pendular arm; a bevel wheel fastened to the supporting body; and a torsion spring for pushing the pendular arm against a slanted surface of the bevel wheel. The bevel wheel is adapted to swing the pendular arm relative to the supporting body so that the imaging axis of the microscope is moved relative to the fitting tip to selectively align the imaging axis between adjacent fiber-optic endfaces for inspection.

Abstract: A microscope system having a plurality of exchangeable objective lenses (10); an objective lens changeover element (18) for supporting each of the objective lenses which is operable for placing a selected one of said objective lenses into an optical axis (22) of the microscope system, wherein each objective lens is supported by the changeover element in such a manner that each objective lens is moveable coaxially with respect to the optical axis and relative to the changeover element; and an actuator element (20, 40) for moving the selected one of the objective lenses coaxially relative to the optical axis and relative to the changeover element for focusing the selected one of the objective lenses relative to a specimen (12).

Abstract: A spectroscopic microscope allowing both molecular spectrometry and visible microscopy of a sample has a light source for its spectrometer which provides Koehler illumination of the sample, i.e., light from points on the light source is projected across an area of the sample, as opposed to directly projecting an image of the light source onto the sample (as with critical illumination). However, the device may be adjusted to alternatively provide critical illumination of the sample, which is useful where spectrometric readings are to be obtained from a smaller area of the sample.

Abstract: A method and apparatus for dynamically focusing an imaging mechanism on a moving target surface having a variable geometry is herein disclosed. Apparatus for focusing an imaging mechanism may include an objective, a prism, or another optical device that forms part of an optical train of an imaging mechanism, a sensor for measuring a distance to the target surface, and a mechanism for modifying the depth of focus of the objective, prism or other optical device. Data from the sensor may be used to create a predictive model of the target surface. Data from the sensor is also used to fit or correlate the generated model to an exemplary target. Data from the correlated model is used to drive the mechanism for modifying the depth of focus of the objective, prism, or other optical device to maintain the surface of the exemplary target in focus.

Abstract: A method of adjusting a projection objective permits the projection objective to be adjusted between an immersion configuration and a dry configuration with few interventions in the system, and therefore to be used optionally as an immersion objective or as a dry objective. The projection objective has a multiplicity of optical elements which are arranged along an optical axis of the projection objective, the optical elements comprising a first group of optical elements following the object plane and a last optical element following the first group, arranged next to the image plane and defining an exit surface of the projection objective which is arranged at a working distance from the image plane. The last optical element is substantially without refracting power and has no curvature or only slight curvature.

Abstract: A confocal microscope has a specimen holding device for holding a specimen (18). The specimen (18) is illuminated by an illuminating unit (10). An optics unit (12) serves to direct radiation produced by the illuminating unit (10) toward the specimen (18) and to direct the radiation emitted by the specimen toward a detector unit (20). The confocal microscope also comprises an aperture diaphragm (34) that is placed in the beam path in front of the detector unit (20). In addition, a focusing lens (30) is provided in the beam path in front of the aperture diaphragm (34). The focusing lens (30) can be moved in order to adjust the confocal microscope, for example, in order to compensate for thermal stresses.

Abstract: The invention is directed to a microscope objective with axially adjustable correction mounts and is applicable in connection with different cover slips and/or different immersion liquids and/or at different work temperatures. In the microscope objective according to the invention, helical springs which are uniformly distributed along the circumference and act in axial direction are fixed by a first ring which has pins in axial direction on which the helical springs are arranged. The pins engage in bore holes of a second ring. The bore holes are at least deep enough to ensure the required spring path. The two rings with the helical springs arranged therebetween on the pins form a spring retainer which ensures a movement of the parts without play and/or in a springing manner. In principle, the proposed solution can be substituted for all pressure springs in microscope objectives and other objectives and can overcome the disadvantages of using individual springs.

Abstract: An observation device including an intermediate tube that houses two relay optical systems and an image rotator, each relay optical system having an exit axis that is substantially parallel to the exit axis of the other relay optical system, and an ocular tube that houses two image formation optical systems and two eyepiece optical systems. The intermediate optical tube has a connecting portion that connects to a connector at the top of a stereoscopic microscope body at one end and is rotatably connected to the ocular tube at the other end, the ocular tube is extendable from, and collapsible into, the intermediate tube over a movement range in the direction of the exit optical axes of the pair of relay optical systems, and exit pupils of the pair of relay optical systems are arranged near a middle position of the range of movement of the ocular tube.

Abstract: The present invention concerns a microscope 1. The microscope 1 encompasses a microscope stand 2, an objective 4 having an optical axis 5, a microscope stage 6 serving to receive a specimen 7, and a focusing device 20 serving to focus the specimen 7. With the focusing device 20, the objective or the microscope stage 6 is positionable relative to the microscope stand 2 in the direction of the optical axis 5 of the objective 4. The focusing device 20 comprises at least one operating element 8 with which an operator controls the positioning of the objective 4 or of the microscope stage 6. For adaptation of the spatial arrangement of the operating element 8 to the needs of an operator, the microscope 1 according to the present invention is characterized in that the spatial arrangement of the operating element 8 relative to the microscope stand 2 is modifiable.

Abstract: A new high resolution confocal and non-confocal scanning laser macroscope is disclosed which achieves fine focus and control of focus position by moving a lens in the intermediate optics. This arrangement is particularly useful for imaging specimens where it is difficult to focus by changing the distance between the scan lens and the specimen, for example for in-vivo imaging, photodynamic therapy, and image-guided surgery. It is also important to keep the lens-to-specimen distance constant when a liquid-immersion scan lens is used, in order to maintain a constant thickness of liquid between the lens and the specimen. In addition to being useful for confocal slicing, motion of the intermediate lens under computer control also enables dynamic focus and the ability to move the focal spot along a general path inside the specimen. Several applications of the imaging system are described.

Abstract: A method of adjusting a projection objective permits the projection objective to be adjusted between an immersion configuration and a dry configuration. The projection objective includes optical elements arranged along an optical axis thereof, which include a first group of elements following the object plane and a last optical element following the first group, which is arranged near the image plane. The last optical element defines an exit surface of the projection objective, which is arranged at a working distance from the image plane. The last optical element is substantially without refracting power and has no or only slight curvature. The method includes varying the thickness of the last optical element, changing the refractive index of the space between the exit surface and the image plane by introducing or removing an immersion medium, and axially displacing the last optical element to set a working distance.

Abstract: A real image type zoom finder that, albeit being reduced in size and thickness, can gain high enough zoom ratios and an imaging system equipped with such a real image type zoom finder. The real image type zoom finder comprises an objective optical system, an image-erection optical system and an eyepiece optical system. The objective optical system comprises a negative first lens group, a positive second lens group, a negative third lens group and a positive fourth lens group. Upon zooming, the first lens group and the fourth lens group remain fixed, the second lens group moves toward the object side at the telephoto, not the wide-angle end, and the third lens group moves toward the image side at the telephoto, not the wide-angle end. The first lens group consists of one single lens of double-concave shape, and that single lens satisfies condition regarding a shape factor.

Abstract: A binocular stereoscopic observation apparatus includes an imaging section forming left and right images with parallax in at least two directions and an observing section in which the images with parallax are stereoscopically observed with a viewer's eyes. In this case, the imaging section has an imaging lens forming images of an object at imaging positions on each of left and right optical paths and i imaging positions on the optical axis of the imaging lens, satisfying the following conditions: L(j?1)<Lj Ek=Lj?L(j?1) Dd<Ek where Lj is a distance, measured along the optical axis, from the imaging lens to the jth imaging position, Ek is a difference between distances, measured along the optical axis, from adjacent imaging positions to the imaging lens, and Dd is an image-side depth of an optical system of the imaging section.

Abstract: A tube for a microscope includes a tube housing, an adaptation interface, a beam guidance device, an operator interface, and a beam deflecting device. The beam deflecting device deflects a light beam coming from the adaptation interface so that the optical axis of the light beam extends in a plane and is guided by the beam guidance device to the operator interface. The tube housing, together with the beam guidance device and the operator interface, is movable relative to the microscope in a direction parallel to the plane.

Abstract: A specimen and an objective lens can be quickly brought close together or separated without an operator being concerned about the positional relationship between the specimen and the objective lens, and once the correct positional relationship is established, the focal position can be finely adjusted. The invention includes a first focusing mechanism for moving the objective lens in an optical axis direction relative to the specimen so as to approach the specimen or withdraw therefrom; a second focusing mechanism for displacing an internal optical system in the optical axis direction, and a switching device for switching between operating the first focusing mechanism and operating the second focusing mechanism when the objective lens is disposed at a predetermined switching position.

Abstract: A light source device and display device capable of suppressing occurrence of unevenness in luminance therefrom by using a light guide with concave or convex structural portions in combination with a reflection layer disposed adjacent the light guide and including a plurality of spacers for strategically positioning the layer's reflecting surface from the light guide. Light within the light guide is both reflected from the guide (e.g., to an adjacent display panel) or emitted onto the reflecting surface and passed back through the guide for eventual emission (e.g., to the same display panel). A reflection sheet including a base sheet, reflection layer and structural portions is also provided.

Abstract: In a microscope system in which at least one of a stage on which a sample 4 is mounted and an objective lens 6 can move relatively in a direction of an optical axis, a contact judgment section 12 judges the possibility of contact between the sample 4 and the objective lens 6 based on a result of comparison between a detection output from a contact sensor 11 which detects contact between the sample 4 and the objective lens 6 and a preset threshold value, excessive contact between the sample 4 and the objective lens 6 is avoided based on a result of this judgment, and a threshold value in the contact judgment section 12 is updated based on the output from the contact sensor 11 every predetermined time.

Abstract: A position adjusting means is provided at an outer periphery of an objective lens opposite to an observation sample and the observation sample is moved by the position adjusting means in an optical axis direction of the objective lens to set a focal point of the objective lens to the observation sample.

Abstract: An image-taking apparatus includes an image-taking portion provided with a taking lens system. A filter to be brought into close contact with the taking lens system is held by a filter holder. A moving mechanism moves a movable member in the direction of the optical axis of the taking lens system. A spring intervenes between the filter holder and the movable member and urges the filter holder toward the taking lens system in the direction of the optical axis thereof.

Abstract: A microscope objective that comprises an objective housing and contains several lens elements, at least one lens element being arranged displaceably in motor-driven fashion within the objective housing, is disclosed. A microscope and a method for imaging a specimen are additionally disclosed.

Abstract: The invention concerns a method and an apparatus for automatically focusing an optical device onto a specific and predetermined region of a specimen. The apparatus compares signals corresponding to the vertical distance between a principal objective and a region of a specimen which is in focus to the vertical distance between the principal objective and a target region on the specimen. If the comparison of the distances indicates that they are not the same, the system automatically alters the distance between the specimen and the principal objective so that the target region is properly focused.

Abstract: A microscope optical system in which both a sample and the viewing optics can be maintained stationary, while at the same time different points or fields of view of the sample can be examined. In the microscope optical system a sample is provided, e.g. on a stage, to be maintained in a stationary position when the sample is viewed. Further, viewing optics of the microscope optical system can be maintained in a stationary position when the sample is viewed. Intermediate optics between the stage and the viewing optics are moveable so that different portions of the sample can be examined without having to move the sample and without having to move the viewing optics.

Abstract: An imaging optical instrument causes light emitted from a plurality of light sources arranged adjacent an object to image on recording surfaces of a photosensitive or thermosensitive material. The optical instrument includes a two-sided telecentric optical system having a first lens disposed adjacent an entrance end of a lens barrel, and a second lens disposed adjacent an exit end of the lens barrel, and an aperture stop disposed adjacent a meeting point of a rearward focus of the first lens and a forward focus of the second lens. The aperture stop has an aperture formed centrally thereof for allowing passage of beams that should contribute to image formation, and a refracting portion surrounding the aperture for refracting beams that should be intercepted and causing these beams to leave the lens barrel from the exit end thereof.

Abstract: An optical apparatus minimizes autofluorescence and stray light as well as leakage of excitation light and efficiently utilizes illuminating light from a fluorescence illumination optical system to allow observation of a bright fluorescence image. An observation apparatus has an objective, an observation optical system unit including a variable magnification optical system, and an imaging optical system unit including an imaging lens and an eyepiece. A fluorescence illumination apparatus, which is provided separately, is removably attached to the observation apparatus. The fluorescence illumination apparatus has a light source, a collector lens unit, and a reflecting member placed between the objective and the observation optical system unit at a position displaced from the optical axis of the objective to make light from the light source incident on the objective. An excitation filter is provided between the light source and the reflecting member.

Abstract: A kit (11) is described for the detection of characteristics and parameters of body fluids such as saliva, urine and cervical mucus for the purposes of studying and identifying fertility periods in women, comprising a set of flat plate-shaped supports (3) for samples of said body fluids (F) and a viewer (1) provided with enlargement means, characterized in that each of said flat plate-shape supports (3) for body fluid (F) presents a shallow basin or trap (3p) with a convex bottom entirely surrounded by a raised rim (3r), and is equipped with locking fins (3t) suitable for coupling with structural elements present on said viewer (1) so that it is irreversibly locked onto the latter in a desired relative posititon.

Abstract: A projection optical system forms an image of an object in a first plane onto a second plane. The projection optical system has an optical element group including at least one refractive member and plural reflective members, and a plurality of lens-barrel units holding the optical element group divided into a plurality of respective groupings. The reflective members are all held by a single lens-barrel unit of the plurality of lens-barrels units.

Abstract: A tip optical element for immersion microscope objectives is constructed so that a first optical element and a second optical element are cemented to each other, and has an annular light-blocking area on a surface of one of the first optical element and the second optical element to be cemented. The tip optical element is fabricated in such a way that a beam restricting device is placed on a surface of one of the first optical element and the second optical element; a light-transmitting area transmitting an effective beam and the light-blocking area formed around the light-transmitting area are provided to the beam restricting device; and the first optical element and the second optical element are cemented to each other, with the beam restricting device sandwiched between them.

Abstract: The apparatus for automatically focusing an image in a microscope includes onto an object plane includes an optical system configured to form an optical image of a sample plane to be observed, an autofocusing detection system, and a focus correction system. The autofocusing system includes an autofocusing light beam source for generating autofocusing light beams. The autofocusing system further includes a detection system lens for directing autofocusing light beams to an autofocusing detection device, and an autofocusing detection device for determining the amount of displacement of the image of the object plane from a desired focused reference plane. The focusing correction system includes a feedback controller and focus adjusting device for automatically adjusting the distance between an objective lens and the sample plane in order to properly focus the image in the optical system. A related method of automatically focusing an image of an object plane in a microscope.

Abstract: An endoscope system in which a normal observation image and a near observation image are photographed by a solid-state image sensor upon operation of a focus adjustment device for changing a focal length and a working distance satisfies: WDWide>WDtele fwide≧ftele where fwide is a focal length in a normal observation mode, WDwide is a working distance in the normal observation mode, ftele is a focal length in a near observation mode, and WDtele is a working distance in the near observation mode. Whereby, the endoscope system is provided with a wide depth of field so as to allow even a person without considerable skills to easily manipulate the system in the magnifying observation mode, is able to improve accuracy of diagnosis information by enhancing seeming resolution of the magnified information, and is able to improve accuracy of diagnosis by facilitating discussion among a plurality of medical doctors.

Abstract: This invention introduces a high accuracy fertility-no-fertility choice device for women. The device-indicator is based on precise examination of the saliva estrogen and for that purpose is used either linear or circular polarized light, plus quick spectral and contrast analysis. All features of the device are built in a special purpose individual mini microscope.

Abstract: The invention is directed to a microscope with multifunctional operator controls for operating a plurality of electrically controlled components such as objective turret, filter turret, diaphragms, focus, illumination devices, and so on. Since the number of microscope functions to be controlled far exceeds the number of operator controls which can be operated in an ergonomic manner, one of the available microscope functions can be selectively assigned to every operator control. Further, functions of externally connected devices such as image recording cameras or manipulators can also be assigned to the operator controls of the microscope.

Abstract: A microscope according to the invention comprises an aberration correcting objective lens facing a specimen and having an aberration correcting lens correcting an aberration due to an error in the thickness of a cover, a Petri dish or a slide glass; a moving amount detector detecting moving amount of the aberration correcting lens; a focusing unit moving the specimen; a driver unit driving the focusing unit; and an arithmetic unit obtaining a defocus amount based on a moving amount detected by the moving amount detector. When the aberration correcting lens is moved, the specimen is put out of focus. On the basis of a defocus amount obtained by the arithmetic unit, the driver unit drives the focusing unit so that the lens may focus on the specimen.