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Lens tester

A measuring instrument and lens technology, which is applied in the field of lens measuring instruments and can solve problems such as conjugate relationship offset

Inactive Publication Date: 2007-07-11
KK TOPCON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] The difference is that if a test lens TL with positive magnification is placed in the measurement optical path 17, the parallel light beam P2 that passes through the test lens TL after being incident from the concave side of the test lens TL, due to the test lens TL The TL effect produces refraction in the direction of convergence, and the conjugate relationship between the target plate 12 and the area sensor 15 shifts

Method used

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Experimental program
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Embodiment 2

[0092] FIG. 15 shows an optical system of a lens measuring instrument in which a measuring beam is incident on the lens TL from the concave side of the lens TL to be measured and a parallel beam P2 is emitted from the convex side of the lens TL. In this FIG. 15, the same reference numerals are attached to the same constituent elements as those in FIG. 5, and they will be described below.

[0093] On the target plate 12, as shown in FIG. 16, five openings 12a-12e are formed. The opening 12a is located on the measurement optical axis O1, and four openings 12b-12e are formed at equal intervals around the opening 12a. In addition, 15 ′ is an area sensor 15 .

[0094] It is assumed that each of the LEDs 10 a - 10 d is made to emit light, and the measurement beam is led to the target plate 12 by the collimator lens 11 . In addition, the eccentric position X3 of the measured lens TL is located on the measurement optical axis O1.

[0095] When the target plate 12 is at the position...

Embodiment 3

[0103]Fig. 18 shows the optical system diagram of the lens measuring instrument using the shadow measurement method. The collimator lens 2 is used to make the parallel light beam enter the lens TL under test. When the lens TL under test is not placed in the measurement optical path 6, the focus lens is used 40. Form the light source images of LED1a and 1b at an eccentric position deviated from the rotating axis O3 of the rotating graphic board 41, and form a prescribed opening pattern on the rotating graphic board 41, and the rotating graphic board 41 rotates with a certain period around the rotating shaft O3.

[0104] When the tested lens TL is a convex lens, the focused light source images of LED1a and 1b are formed in front of the rotating graphic board 41, and when the tested lens TL is a concave lens, the focused light source images of LED1a and 1b are formed behind the rotating graphic board 41 picture. An imaging lens 42 is arranged between the rotating graphic board 41...

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Abstract

The prensent invention provides a lens meter capable of eliminating disagreement of optical characteristics between the time when parallel luminous fluxes as measurement luminous flux enter a lens to be inspected from a convex face side of the lens to measure optical characteristic at a position where the lens is eccentric using an optical system of measurement principle type for obtaining optical characteristic of the lens due to the displacement of the measurement luminous flux after penetrating the lens and the time when measurement luminous flux enters the lens from a concave face side of the lens to measure optical characteristic at the position where the lens is eccentric using an optical system of measurement principle type for obtaining optical characteristic of the lens due to travel amount of a target plate when the target plate is moved along a measurement optical axis so as to emit parallel luminous fluxes from the convex face side. The optical system of measurement principle type for making parallel luminous fluxes P1 as measurement luminous flux enter the lens from the convex face side of the lens TL makes parallel luminous fluxes P1', P1'' oblique for the measurement optical axis 01 as the measurement luminous flux enter the lens TL.

Description

technical field [0001] It is measured by a measuring instrument that uses the measurement principle of measuring the optical characteristics of the lens under test by making a parallel beam of light as a measurement beam incident on the lens under test from the convex side of the lens under test and using the displacement of the measurement beam after passing through the lens under test. When measuring the optical characteristics of the eccentric position on the lens under test, and when the measurement beam is injected into the lens under test from the concave side of the lens under test and the target plate is moved along the measurement optical axis so that a parallel beam is emitted from the convex side, Calculate the optical characteristics of the lens under test according to the movement amount of the target plate. When measuring the optical characteristics of the eccentric position on the lens under test by using the measuring instrument of the above-mentioned measuring ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M11/02G01B9/00
CPCG01B11/24
Inventor 柳英一
Owner KK TOPCON
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