摘要:
An object of the present invention is to provide: a zoom lens system that has a high resolution, high capability of compensating curvature of field, a high zoom ratio of, for example, 3 or greater, a reduced weight, and a reduced overall optical length at the time of non-use; and an imaging device and a camera that employ this zoom lens system so as to have a reduced thickness and excellent portability as well as high performance. The zoom lens system forms an optical image of an object with variable magnification and, in order from the object side to the image side, comprises: a first lens unit having negative optical power; a second lens unit that has positive optical power and that contains a bi-convex lens element composed of a resin material and serving as the most image side lens element; and a third lens unit having positive optical power. Then, the lens units move respectively along the optical axis in such a manner that intervals between the individual lens units should vary so that the variable magnification is achieved. Further, the condition |(R2mi1+R2mi2)/(R2mi1−R2mi2)|
摘要:
A zoom lens system is provided that includes a compactly constructed focusing lens unit and that has a suppressed change in the image magnification at the time of movement of a focusing lens unit. The zoom lens system according to the present invention comprises: a positive lens unit that is arranged on an object side relative to the aperture diaphragm; a negative lens unit that is arranged on an image side relative to the positive lens unit and on an object side relative to the aperture diaphragm; and a focusing lens unit that is arranged in an optical path between the negative lens unit and the aperture diaphragm. The zoom lens system satisfies the condition (4): 1.20 3.0, βNT(βNW): a composite focal length of the focusing lens unit and the negative lens unit in an infinity in-focus condition at a telephoto (wide-angle) limit when the focusing lens unit has negative optical power, or a lateral magnification of the negative lens unit at a telephoto limit in an infinity in-focus condition when the focusing lens unit has positive optical power, fT: a focal length of the entire system at a telephoto limit, fW: a focal length of the entire system at a wide-angle limit.
摘要:
A zoom lens system is provided that includes a compactly constructed focusing lens unit and that has a suppressed change in the image magnification at the time of movement of a focusing lens unit and further that can compensate an image blur caused by vibration applied to the entire system. The zoom lens system according to the present invention comprises a plurality of lens units and an aperture diaphragm arranged in the lens unit. The plurality of lens units include: a negative lens unit that is arranged on an object side relative to the aperture diaphragm and provided with negative optical power having an absolute value greatest in the entire system and that moves in a direction along an optical axis at the time of zooming; a focusing lens unit that is arranged in an optical path between the negative lens unit and the aperture diaphragm and that moves in a direction along the optical axis at the time of focusing such that an interval relative to the negative lens unit should vary; and an image blur compensation lens unit that is arranged on the image side relative to the focusing lens unit and that moves in a direction perpendicular to the optical axis when the image blur caused by vibration in the zoom lens system should be compensated.
摘要:
A camera body includes an imaging element, a hot shoe, and a camera controller. The imaging element is configured to convert an optical image of the subject into an electrical signal, and is configured to produce image data about the subject. The hot shoe allows the flash device to be mounted. The camera controller is configured to calculate an evaluation value on the basis of the image data produced by the imaging element, and is configured to perform video autofocusing on the basis of this evaluation value. The camera controller is configured to control the imaging element and the flash device so that when the camera controller decides that auxiliary light is needed, and the camera controller decides that the external auxiliary light source of the flash device mounted to the hot shoe is not compatible with video autofocusing, the image data is acquired while an external main light source of the flash device intermittently emits light during the video autofocusing.
摘要:
A zoom lens system comprising a first lens unit having negative power, a second lens unit having positive power and a third lens unit having positive power, wherein in zooming from a wide-angle limit to a telephoto limit, the lens units move respectively along an optical axis in such a manner that an interval between the first lens unit and the second lens unit decreases while an interval between the second lens unit and the third lens unit changes so that variable magnification is achieved, the first lens unit comprises one object side negative lens element and one image side positive lens element with a convex surface facing the object side, which have an aspheric surface, and the conditions: n12>1.88 and ν12
摘要:
A zoom lens system comprising a first lens unit having negative power, a second lens unit having positive power and a third lens unit having positive power, wherein in zooming from a wide-angle limit to a telephoto limit, the lens units move respectively along an optical axis in such a manner that an interval between the first lens unit and the second lens unit decreases while an interval between the second lens unit and the third lens unit changes so that variable magnification is achieved, the first lens unit comprises one object side negative lens element and one image side positive lens element with a convex surface facing the object side, which have an aspheric surface, and the conditions: n12>1.88 and ν12
摘要:
A zoom lens system comprising a first lens unit having negative power, a second lens unit having positive power and a third lens unit having positive power, wherein in zooming from a wide-angle limit to a telephoto limit, the lens units move respectively along an optical axis in such a manner that an interval between the first lens unit and the second lens unit decreases while an interval between the second lens unit and the third lens unit changes so that variable magnification is achieved, the first lens unit comprises one object side negative lens element and one image side positive lens element with a convex surface facing the object side, which have an aspheric surface, and the conditions: n12>1.88 and ν12
摘要:
A position detecting apparatus for detecting the position of a substrate in an interval direction in which the substrate is spaced by an interval form a pattern-printing projection optical system for printing pattern on the substrate includes first and second luminous flux projecting and receiving systems and a detector. The first luminous flux projecting system projects a first luminous flux to the substrate form a direction oblique to the interval direction. The first luminous flux receiving system receives a first luminous flux after the first luminous flux is reflected form the substrate. The second luminous flux projecting system projects a second luminous flux to a reflection member secured to the bottom end of the pattern-printing projection optical system. The second luminous flux receiving system receives the second luminous flux after the second luminous flux is reflected by the reflection member. The detection detects the position of the substrate in the interval direction by detecting the position at which the first luminous flux receiving system receives the first luminous flux and by detecting the position at which the second luminous flux receiving system receives the second luminous flux.
摘要:
A light source portion having an acousto-optic element produces a laser beam of two light components having a frequency difference .DELTA.w and having registered polarization directions. The laser beam is subsequently divided by a half mirror. One of the divided laser beams is detected by a photoelectric detector as reference light, and a corresponding signal is applied to a synchronism detector. The other laser beam is projected by a scanning optical system to the surface of, e.g., an original to be examined to scan the same. At the position on the surface irradiated by the scanning light spot, the laser beam is modulated at a beat frequency .DELTA.w on the basis of optical heterodyne interference. A synchronism detector detects a signal corresponding to the scattered light from a particle or defect on the surface being examined, in synchronism with the frequency of the reference light, whereby the particle or defect can be detected with a good signal-to-noise ratio.
摘要:
A displacement detecting system includes a scale provided on a surface of a movable object and having a diffraction grating formed along a predetermined direction, a head unit disposed above the surface of the movable object and having a plurality of detection heads, for detecting displacement of the scale in the predetermined direction, the detection heads being disposed along a direction different from the predetermined direction, and a selecting device for selecting at least one detection head out of the detection heads, for detection of a displacement of the scale in the predetermined direction.