Abstract: A lens meter having a measurement-optical system including a light source which projects and a light-receiving sensor which receives a light beam having passed through the lens; an arithmetic part which obtains optical characteristics of the lens from results received by the light-receiving sensor; mode selecting device which selects between a single-focal-lens-measurement mode and a progressive-lens-measurement mode; detecting device which detects directions and degrees of displacement of measurement positions from a near-vision portion of a progressive lens based on optical characteristics obtained when the progressive-lens-measurement mode is selected and alignment is made to bring the measurement position into the near-vision portion; a display which displays an alignment screen; and a display-control part which causes the display, based on detection results by the detection device, to display a guide mark indicating a direction and an amount that the lens must be moved to bring the measurement position i

Abstract: A lens meter capable of obtaining optical characteristics of a lens with high stability and accuracy has a measurement optical system including a target panel having measurement targets having first measurement targets and second measurement targets and a photodetector which photo-receives a measurement light bundle, a calculation means which calculates the optical characteristics including first calculation means which calculates first optical characteristics based on a detection result of the first measurement targets by the photodetector and second calculation means which calculates second optical characteristics based on a detection result of the first and second measurement targets, and display control means which displays the second optical characteristics as the optical characteristics of the lens if the calculation result by the first calculation means or the detection result by the photodetector satisfies a predetermined condition and displays the first optical characteristics if the predetermined co

Abstract: A lens meter for measuring optical characteristics of a lens to be measured includes a measurement optical system including a light source which projects a measurement light beam to the lens and a light receiving sensor which receives the measurement light beam having passed through the lens; an arithmetic part which obtains optical characteristic distribution of a predetermined measurement region of the lens based on a light reception result of the light receiving sensor; near-vision-portion determination means which determines whether a near vision portion of the lens is present in the measurement region based on the optical characteristic distribution in the measurement region; and detection means which detects presence of a non-optical region in addition to an optical region of the lens in the measurement region based on the light reception result of the light receiving sensor; the arithmetic part obtains additional power of the lens based on the optical characteristic distribution of the optical region i

Abstract: A lens meter for measuring optical characteristics of a lens to be measured includes a measurement optical system including a light source which projects a measurement light beam to the lens and a light receiving sensor which receives the measurement light beam having passed through the lens; an arithmetic part which obtains optical characteristic distribution of a predetermined measurement region of the lens based on a light reception result of the light receiving sensor; near-vision-portion determination means which determines whether a near vision portion of the lens is present in the measurement region based on the optical characteristic distribution in the measurement region; and detection means which detects presence of a non-optical region in addition to an optical region of the lens in the measurement region based on the light reception result of the light receiving sensor; the arithmetic part obtains additional power of the lens based on the optical characteristic distribution of the optical region i

Abstract: The present invention has an object to provides a lens meter which readily enables alignment of a progressive lens even by an inexperienced examiner.

Abstract: A lens meter capable of obtaining optical characteristics of a lens with high stability and accuracy has a measurement optical system including a target panel having measurement targets having first measurement targets and second measurement targets and a photodetector which photo-receives a measurement light bundle, a calculation means which calculates the optical characteristics including first calculation means which calculates first optical characteristics based on a detection result of the first measurement targets by the photodetector and second calculation means which calculates second optical characteristics based on a detection result of the first and second measurement targets, and display control means which displays the second optical characteristics as the optical characteristics of the lens if the calculation result by the first calculation means or the detection result by the photodetector satisfies a predetermined condition and displays the first optical characteristics if the predetermined co

Abstract: A lens meter for measuring refractive power distribution of a progressive power lens and displaying its distribution map, has a lens rest having an aperture, an optical system including an axis, a source projecting a light bundle along the axis, a plate having targets and a two-dimensional image sensor detecting images by the bundle passing through the lens, aperture and plate, a part calculating the distribution within a measurement region from detection results, a part detecting a lens-position in a two-dimensional direction orthogonal to the axis, a device guiding movement on the rest to shift the measurement region and obtaining the distribution within an analysis region including distance, progressive and near portions, a part storing the distribution in the measurement region in association with the detected position, a display part, and a part controlling to display the distribution map within the analysis region based on the stored distribution and position.

Abstract: A lens meter excellent in operability during alignment capable of informing in which direction a subject lens should be moved. A lens meter has a measurement optical system having an optical axis, a light source projecting a light bundle onto the lens, and a photo-sensor photo-receiving the bundle, a part which obtains the optical characteristics from a photo-receiving result, a device which detects an alignment condition of a desired position or region with the axis, a part which displays an alignment screen, and a part which provides fixed display of a target mark indicating a measurement position or region and provides movable display of a lens mark representing the lens and a guide mark indicating an alignment target position or region, where a movement direction of the lens relative to the axis coincides with movement directions of the lens mark and the guide mark relative to the target mark.

Abstract: A lens meter for measuring optical characteristics of a lens to be examined, comprises: a measurement optical system including a measurement optical axis, a light source, and a photo-receiving element; an arithmetic part which determines a deviation of an optical axis of the lens from the measurement optical axis based on a light receiving result of the photo-receiving element; a display; and a control part which displays a reticle mark whose center represents the measurement optical axis and a target mark whose center represents the optical axis of the lens on the display so that both marks are in a positional relation according to the determined deviation, and which also displays a guide mark on the display within a predetermined distance from the center of the reticle mark.

Abstract: A lens meter obtaining 0D-reference-coordinates of target-images not detected in a reference state and measuring even progressive lenses, has a lens rest, an optical system having an optical axis, a light source, measurement targets and a photo-sensor, a part calculating optical characteristics based on coordinates-change of target-images in a measurement state with the lens on the rest and axis from those in a reference state without the lens thereon, and an information memory.

Abstract: A lens meter for measuring optical characteristics of a lens, which is capable of measuring a progressive lens easily and an aspherical lens accurately. The lens meter is provided with a lens rest having an aperture, for placing a lens thereon, a measurement optical system having a light source which projects a measurement light bundle onto the lens placed on the lens rest and a photodetector which receives the measurement light bundle transmitted through the lens, for forming a plurality of different measuring positions inside the aperture, calculation means for obtaining optical characteristics at each of the measuring positions based on an output from the photodetector, comparison means for comparing the optical characteristics obtained at the measuring positions, and guiding means for guiding a predetermined one of the measuring positions to at least one of a near viewing section and a far viewing section of a progressive lens based on a result of the comparison.

Abstract: A lens meter for measuring refractive power distribution of a progressive power lens and displaying its distribution map, has a lens rest having an aperture, an optical system including an axis, a source projecting a light bundle along the axis, a plate having targets and a two-dimensional image sensor detecting images by the bundle passing through the lens, aperture and plate, a part calculating the distribution within a measurement region from detection results, a part detecting a lens-position in a two-dimensional direction orthogonal to the axis, a device guiding movement on the rest to shift the measurement region and obtaining the distribution within an analysis region including distance, progressive and near portions, a part storing the distribution in the measurement region in association with the detected position, a display part, and a part controlling to display the distribution map within the analysis region based on the stored distribution and position.

Abstract: A lens meter excellent in operability during alignment capable of informing in which direction a subject lens should be moved. A lens meter has a measurement optical system having an optical axis, a light source projecting a light bundle onto the lens, and a photo-sensor photo-receiving the bundle, a part which obtains the optical characteristics from a photo-receiving result, a device which detects an alignment condition of a desired position or region with the axis, a part which displays an alignment screen, and a part which provides fixed display of a target mark indicating a measurement position or region and provides movable display of a lens mark representing the lens and a guide mark indicating an alignment target position or region, where a movement direction of the lens relative to the axis coincides with movement directions of the lens mark and the guide mark relative to the target mark.

Abstract: A lens meter obtaining 0D-reference-coordinates of target-images not detected in a reference state and measuring even progressive lenses, has a lens rest, an optical system having an optical axis, a light source, measurement targets and a photo-sensor, a part calculating optical characteristics based on coordinates-change of target-images in a measurement state with the lens on the rest and axis from those in a reference state without the lens thereon, and an information memory.

Abstract: A lens meter capable of easily measuring optical characteristics of far and near viewing sections of a multifocal lens to obtain optical characteristics of a multifocal lens. The lens meter comprises a first measurement optical system having a first measurement optical axis, for measuring optical characteristics of a far viewing section of a multifocal lens, and a second measurement optical system having a second measurement optical axis which is different from the first measurement optical axis, for measuring optical characteristics of a near viewing section of the multifocal lens.

Abstract: A lens meter for measuring optical characteristics of a lens, which is capable of measuring a progressive lens easily and an aspherical lens accurately. The lens meter is provided with a lens rest having an aperture, for placing a lens thereon, a measurement optical system having a light source which projects a measurement light bundle onto the lens placed on the lens rest and a photodetector which receives the measurement light bundle transmitted through the lens, for forming a plurality of different measuring positions inside the aperture, calculation means for obtaining optical characteristics at each of the measuring positions based on an output from the photodetector, comparison means for comparing the optical characteristics obtained at the measuring positions, and guiding means for guiding a predetermined one of the measuring positions to at least one of a near viewing section and a far viewing section of a progressive lens based on a result of the comparison.

Abstract: A lens meter capable of easily measuring optical characteristics of far and near viewing sections of a multifocal lens to obtain optical characteristics of a multifocal lens. The lens meter comprises a first measurement optical system having a first measurement optical axis, for measuring optical characteristics of a far viewing section of a multifocal lens, and a second measurement optical system having a second measurement optical axis which is different from the first measurement optical axis, for measuring optical characteristics of a near viewing section of the multifocal lens.

Abstract: A lens meter comprising light sources for project luminous flux for measurement to a lens to be examined and a light receiving element for detecting the measuring luminous flux passed through the lens to be examined, wherein refractive characteristics of the lens is detected on the basis of the examined data by the light receiving element, the lens meter comprises a measurement target having predetermined patterns, device for moving the target to one of a plurality of arrangement positions on the optical path of the measuring luminous flux, device for selecting one position to which the measurement target is to be moved among a plurality of arrangement positions on the optical path on the basis of the examined data by the light receiving element, device for controlling the target moving device in accordance with the selection by the selecting device.

Abstract: An apparatus for measuring an optical characteristic of an examined lens, comprising a first measuring optical system for projecting a first measuring light flux on an examined lens, which is enlarged so as to cover a relative large area of the lens, via both a first grating and a second grating which has a predetermined positional relationship with the first grating, thereby forming moire fringes thereon, then detecting the moire fringes by a two dimensional photo detector, a first calculating device for calculating each principle point refractive power at each point of the lens by processing results detected by the first measuring optical system, a second measuring optical system for projecting a second measuring light flux on a small area of the lens, then detecting a position of an image of the second measuring light flux by a positional photo-detector, a second calculating device for calculating a back vertex power at the small area by processing results detected by the second measuring optical system, a

Abstract: A lens meter having a measuring optical system comprises a device for measuring an optical characteristics continuously, a device for introducing the lens to the desired positional relation for a measuring optical axis in the measuring optical system on the basis of the measured data, a device for generating the alignment ending signal when the alignment is achieved to the predetermined standard level, a device for judging whether the measured data is stable within a predetermined permissible range of the variation, and a device for storing the measured data of the lens based on the judgment result. This apparatus further comprises a device for designating which the left or right lens should be measured, a device for generating the signal for reading-and-storing the measured data, a device for storing the measurement result, a device for detecting whether the lens exists on the measuring optical axis, and a device for judging the changing-over of the left or right of the lens.