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Image-side telecentric lens for optical measurement

A telecentric lens and optical measurement technology, which is applied in the field of optical measurement, can solve problems such as the inability to measure the depth of a virtual scene and the angle of view, and achieve the effects of low cost, low difficulty, and simple processing

Active Publication Date: 2021-01-05
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] The current virtual display devices are mainly head-mounted displays, which are designed according to the characteristics of the human eye. Human eyes can see virtual scenes through the head-mounted display, but they can only roughly understand them through their own subjective feelings. Evaluate the display performance of a virtual display device (head-mounted display), but cannot accurately measure the depth and field of view of a virtual scene
Field of view, angular resolution, and scene depth are very important indicators for evaluating the display performance of head-mounted displays, but there is currently a lack of a method for quantitatively testing these performance indicators in this field

Method used

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  • Image-side telecentric lens for optical measurement
  • Image-side telecentric lens for optical measurement
  • Image-side telecentric lens for optical measurement

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Embodiment Construction

[0022] The present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0023] Terms related to the present invention:

[0024] 1. MTF: Modulation transfer function, which is an important reference standard for lens imaging quality;

[0025] 2. F-number: the aperture number, which is the ratio (f' / D) of the effective focal length f' of the system to the entrance pupil diameter D (diameter of the diaphragm).

[0026] The lens structure of the present invention is as follows figure 1 As shown, the numbers 1 to 6 respectively represent the diaphragm, the first lens, the second lens, the third lens, the fourth lens and the fifth lens, and the number 7 is the system image plane.

[0027] The lens of the present invention includes a diaphragm 1, a front lens group, a middle lens group and a rear lens group.

[0028] The front lens group is a positive refractive index lens group, including a first lens 2 (positive lens); the mi...

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Abstract

The invention provides an image space telecentric lens for optical measurement, and the lens can be combined with some mechanical parts to quantitatively detect the display performance of a head-mounted display. According to the image space telecentric lens for optical measurement, the design of five glass spherical lenses is adopted, a diaphragm is arranged in front of a first surface of the lens, the lens is approximately designed in an image space telecentric mode, an entrance pupil diameter can be adjusted within the range of 2mm-10mm and is similar to the human eye pupil adjusting range,the effective focal length of a system is 21.092mm, the F number is 2.1, and the half-field angle is 10 degrees. And a good MTF is realized in a full view field range. Through a traditional optical design method, the lens which has part of human eye characteristics, is low in cost and easy to process is designed, and therefore the lens is used for replacing human eyes for optical measurement.

Description

technical field [0001] The invention belongs to the technical field of optical measurement, and in particular relates to an image-side telecentric lens for optical measurement. Background technique [0002] The current virtual display devices are mainly head-mounted displays. The head-mounted display is designed according to the characteristics of the human eye. The human eye can see the virtual scene through the head-mounted display, but it can only be approximated through their own subjective feelings. To evaluate the display performance of virtual display devices (head mounted displays), it is impossible to accurately measure the depth and field of view of virtual scenes. The field of view, angular resolution, and scene depth are very important indicators for evaluating the display performance of head-mounted displays, but there is currently a lack of a quantitative method to detect these performance indicators in the field. SUMMARY OF THE INVENTION [0003] In view of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M11/02G02B13/00G02B13/22
CPCG01M11/0207G02B13/005G02B13/22
Inventor 宋维涛张擎天王涌天刘越
Owner BEIJING INSTITUTE OF TECHNOLOGYGY