Device for measuring relative aperture of photographic objective and measuring method thereof

A photographic objective lens and relative aperture technology, applied in the field of optical measurement, can solve the problems of cumbersome operation steps, inability to achieve one-time measurement, and inaccurate measurement accuracy, and achieve the effect of simplifying measurement steps, realizing automatic interpretation and measurement, and ensuring measurement accuracy.

Pending Publication Date: 2020-06-12
苏州东辉光学有限公司
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Problems solved by technology

[0005] The traditional measurement of the entrance pupil diameter of the photographic objective lens can only measure its focal length and entrance pupil diameter separately, measure two values, and then obtain its relative aperture value through calculation, which cannot achieve one measurement, and the operation steps are cumbersome, which easily leads to measurement Precision is not precise enough

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  • Device for measuring relative aperture of photographic objective and measuring method thereof
  • Device for measuring relative aperture of photographic objective and measuring method thereof
  • Device for measuring relative aperture of photographic objective and measuring method thereof

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Embodiment Construction

[0033] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, so as to define the protection scope of the present invention more clearly.

[0034] Referring to the accompanying drawings, a device for measuring the relative aperture of a photographic objective lens includes: an optical bench 1, a collimator 2, a diffusion screen 3, a holder 6, a camera assembly 7, a translation stage 8 and a computer 9. The collimator 2 is arranged on the optical bench 1, and the inside of the collimator 2 includes a light bulb 21, a ground glass 22, a Boro plate 23, a collimator objective lens 24, a light bulb 21, a ground glass 22, a Boro plate 23, and a collimator objective lens 24 are arranged sequentially from the side of the collimator 2 away from the photographic objective lens 5 to be tested to...

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Abstract

The invention discloses a device for measuring the relative aperture of a photographic objective. The device comprises an optical bench, a collimator, a diffusion screen, a holder, a camera assembly,a displacement table and a computer. The collimator is arranged on the optical bench, and the diffusion screen, a to-be-measured objective lens and the camera assembly are sequentially located in theoptical axis direction of the collimator; the diffusion screen is arranged on the optical bench through a fixing frame; a to-be-measured photographic objective lens is arranged on the clamp holder andis arranged on the optical bench through the clamp holder; and the camera shooting assembly is arranged on the displacement table, is arranged on the optical bench through the displacement table, andis connected with the computer. The invention further discloses a measuring method by using the photographic objective relative aperture measuring device. The measuring method comprises the followingsteps: assembling the device; measuring a focal length; measuring the entrance pupil diameter; deriving aperture values. By means of the mode, the entrance pupil diameter and the focal length can bemeasured, two kinds of equipment do not need to be used for measurement respectively, measurement steps are simplified, and the measurement accuracy can be improved.

Description

technical field [0001] The invention relates to the technical field of optical measurement, in particular to a measuring device for the relative aperture of a photographic objective lens and a measuring method thereof. Background technique [0002] Traditionally, the measurement of the relative aperture of the photographic objective lens is achieved by measuring its entrance pupil diameter and focal length respectively. [0003] For the measurement of the entrance pupil diameter, the focal plane point light source method is generally used for measurement or experimental measurement microscope measurement. In the traditional entrance pupil diameter measurement, the focal plane point light source method is used to measure the entrance pupil diameter of the photographic objective lens, and the size of the projected bright spot blocked by the frosted glass is equal to the entrance pupil diameter. In the measurement process, there will be errors due to the selection of frosted g...

Claims

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Application Information

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IPC IPC(8): G01M11/04G01M11/02
CPCG01M11/0207G01M11/0257G01M11/04
Inventor 王再丰秦明海
Owner 苏州东辉光学有限公司
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