An image space 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: 2021-11-19
BEIJING INSTITUTE OF TECHNOLOGYGY
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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
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[0022] The present invention will be described in detail below with reference to the accompanying drawings.
[0023] Terms according to the invention
[0024] 1, MTF: Modulation transfer function is an important reference standard for lens imaging quality;
[0025] 2, F number: The number of aperture is the ratio of the effective focal length f 'of the system (f' / d).
[0026] The lens structure of the present invention is like figure 1 As shown, numbered 1 to 6 represent a diaphragm, a first lens, a second lens, a third lens, a fourth lens, and a fifth lens, and numbered 7 is a system image plane.
[0027] The lens of the present invention includes a stop 1, a front lens group, a medium lens group, and a rear lens group.
[0028] Among them, the front lens group is a positive refractive index lens group, including the first lens 2 (positive lens); the medium lens group is a negative refractive index lens group, including a second lens 3 (positive lens) and the third lens 4 (nega...
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The invention provides an image space telecentric lens for optical measurement, which can be combined with some mechanical components to quantitatively detect the display performance of a head-mounted display. The image space telecentric lens for optical measurement of the present invention adopts the design of 5 glass spherical lenses, the diaphragm is placed in front of the first surface of the lens, the lens is similar to the image space telecentric design, and the diameter of the entrance pupil can be 2mm to 10mm Adjustment within the range is similar to the adjustment range of the pupil of the human eye. The effective focal length of the system is 21.092mm, the F number is 2.1, the half field of view of the system is 10°, and it has a good MTF in the full field of view. Through the traditional optical design method, a lens with some characteristics of the human eye, low cost and simple processing is designed, so that the lens can be used to replace the human eye for optical measurement.
Description
Technical field [0001] The present invention relates to the field of optical measurement, and more particularly to an image-a telecentric lens for optical measurement. Background technique [0002] The current virtual display device is mainly designed according to the characteristics of human eye, and the human eye can see the virtual scene by head wear display, but can only pass the subjective feelings. Evaluate the display performance of the virtual display device (headset display), and the depth of the virtual scene cannot be accurately measured from the field of view. The viewing angle, angular resolution, and scene depth are metrics that evaluate head-mounted display performance, but there is currently a quantitative method of detecting these performance indicators. Inventive content [0003] In view of this, the present invention provides a vaginal teletece lens for optical measurement, and can be combined with some mechanical components, and the header display is displaye...
Claims
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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