摘要:
A surface to be tested and an optical system for projecting an index to an apparent spherical center position of the surface to be tested are moved relative to each other and an eccentric quantity of the surface to be tested is calculated from an movement quantity. A focal distance of an optical system is changed according to an apparent radius of curvature of each surface to be tested, which is calculated in advance. A reflection image on a surface to be tested, which is to be measured, is determined from the apparent radius of curvature of each surface to be tested, which is calculated in advance. Thus, an eccentric quantity of the entire lens system is accurately measured.
摘要:
A method for displaying a result of measurement of eccentricity in an optical system is provided where an amount of eccentricity for each lens element's surface in a lens system can be displayed and where the amount of eccentricity displayed can be a magnified amount of eccentricity. Additionally a sectional view of the lens system can be displayed using scaling factor.
摘要:
A surface to be tested and an optical system for projecting an index to an apparent spherical center position of the surface to be tested are moved relative to each other and an eccentric quantity of the surface to be tested is calculated from an movement quantity. A focal distance of an optical system is changed according to an apparent radius of curvature of each surface to be tested, which is calculated in advance. A reflection image on a surface to be tested, which is to be measured, is determined from the apparent radius of curvature of each surface to be tested, which is calculated in advance. Thus, an eccentric quantity of the entire lens system is accurately measured.
摘要:
A compact magnification-varying viewfinder optical system includes an objective lens unit for forming a primary image, the objective lens unit having at least one curved reflection surface arranged to reflect a light flux and a lens surface, and an eyepiece lens unit for observing the primary image, wherein an optical power is imparted to the curved reflection surface.
摘要:
An optical unit includes photoelectric conversion modules, a plurality of adapter support members whose upper parts are rotatably supported, and a plurality of optical connector adapters attached to lower ends of the adapter support members so as to be arranged next to each other, the optical connector adapters being contained in the optical unit. The adapter support members are rotated separately so that the optical connector adapters are extracted outside from the optical unit with a space formed between each adjacent two of said optical connector adapters. Each of the optical connector adapters has insertion holes to which optical connectors of optical fibers extending from the photoelectric conversion modules and optical connectors of external optical fibers are connected.
摘要:
A dresser includes a super-abrasive fixed by electroplating on a working face which is disposed perpendicular to the axis of rotation of the dresser, the height of protrusion of particles of the super-abrasive is 5 to 30% of an average diameter of the particles, and a process for producing such a dresser includes temporarily fixing the super-abrasive in an amount to form a single layer to a base metal by electroplating, removing loose stones in the temporarily fixed super-abrasive by a grinder or shaking, electroplating a surface having the temporarily fixed super-abrasive with a metal until thickness of the plating metal reaches height of the most protruded part of the super-abrasive or until particles of the super-abrasive are completely buried in the plating metal, and working the electroplated surface for abrasive protrusion to expose most protruded parts of the super-abrasive resulting in a high accuracy dresser which enables dressing of a polishing pad in a short time and eliminates the releasing of particles of the super-abrasive with excellent flatness to the polishing pad.
摘要:
An optical performance is deteriorated by a minute phase difference of transmission wave front of an ND filter. In a light quantity adjusting device which includes an ND filter (P1) for attenuating a quantity of light passing through an aperture formed by diaphragm blades (S11 and S12) and in which a cover ratio of the aperture by the ND filter (P1) is changed, setting is conducted such that a phase difference between lights with a predetermined wavelength λ which pass through regions (N11, N12, and N13) of the ND filter (P1) with different transmittances inside the aperture becomes substantially 0λ, substantially 1λ, or substantially 2λ in a state in which the aperture is completely covered with the ND filter (P1).
摘要:
A method for displaying a result of measurement of eccentricity in an optical system is provided where an amount of eccentricity for each lens element's surface in a lens system can be displayed and where the amount of eccentricity displayed can be a magnified amount of eccentricity. Additionally a sectional view of the lens system can be displayed using scaling factor.
摘要:
Disclosed is a measuring method which can measure the decentering of an axis by the measurement of a two-dimensional curved surface profile. This method has a first step of measuring a profile of a examined surface by a probe from a first reference position which is a position separate by a predetermined amount from a predetermined position on the examined surface of a subject lens, a second step of measuring the profile of the examined surface by scanning the examined surface by the probe from the second reference position which is a position separate by a predetermined amount from said predetermined position in a route opposite to the scanning direction of said first step after a rotation of the subject lens; and the step of obtaining the decentering amount of the examined surface by the use of the measurement results obtained at the first and second steps.
摘要:
To provide an ND filter and a light amount adjusting device, in which a deterioration of optical performance of an optical system is small, and in addition, an optical system having the light amount adjusting device, and an optical device having the optical system. More specifically, an ND filter according to the present invention includes: a base that transmits light having a predetermined wavelength λ; and a filter member selectively formed on the base, in which: a transmittance of the filter member gradually changes in a region in a predetermined direction; and a phase difference which is produced between light transmitting through the filter member and light transmitting through a region on the base in which the filter member is not formed is λ/5 or less in a boundary of the filter member.