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Optical engine of infrared digital light processing (DLP) telecentric projection system

A projection optical system and infrared light source technology, applied in optics, optical components, instruments, etc., can solve problems such as poor uniformity of illumination beam angle, inapplicability of infrared optical system, and complex design of free-form surface, so as to improve energy utilization rate, Uniform lighting effect, the effect of controlling manufacturing cost

Inactive Publication Date: 2013-05-29
SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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Problems solved by technology

However, since the illumination beam of the non-telecentric optical path is not parallel, the angular uniformity of the illumination beam is not as good as that of the telecentric structure.
[0010] The telecentric structure is simple, but the splitting effect of the TIR prism on the beam, even in theory, only 25% of the energy can be projected out, and the TIR prism bonding material has a large absorption of infrared, resulting in too much energy loss of the structure. Not suitable for infrared optical systems
Rather than a telecentric architecture, the biggest problem is that the design and manufacturing costs are relatively high, and it may also be necessary to use a free-form reflector to separate the lighting system and the projection system
The design of the free-form surface is relatively complicated, and the cost of research and development and processing is very high

Method used

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  • Optical engine of infrared digital light processing (DLP) telecentric projection system
  • Optical engine of infrared digital light processing (DLP) telecentric projection system
  • Optical engine of infrared digital light processing (DLP) telecentric projection system

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Embodiment Construction

[0021] Such as figure 1 As shown, the present invention includes: an infrared light source 1, an ellipsoidal reflective bowl 2, a hollow square rod 3, an illumination relay lens group 4, a DMD micromirror array 5, a plane reflector 6, and a projection objective lens 7. The infrared light source 1 is placed on one focal point of the ellipsoidal reflective bowl 2, and according to the geometric properties of the ellipse, its light beam will converge on the other focal point of the ellipsoidal reflective bowl. The inside of the reflective bowl should be coated with a reflective film, and it has a reflectivity of more than 90% in the infrared band. The size of the mouth of the reflective bowl 2 should be determined by the numerical aperture of the subsequent lighting relay lens group 4 .

[0022] The hollow square rod 3 absorbs the light reflected by the infrared light source and the reflective bowl, performs light integration, and forms a spatially uniform beam distribution at t...

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Abstract

The invention discloses an optical engine of an infrared digital light processing (DLP) telecentric projection system. The optical engine is mainly used for the research on an infrared scene simulator. The invention provides a telecentric light path structure without a total-internal-reflectance (TIR) prism; and the optical structure comprises an infrared light source, an ellipsoidal reflecting bowl, a hollow square bar, a group of illumination relaying lenses, a digital mirror device (DMD) chip, a plane reflector and a group of projection objective lenses. By the system, the design of a telecentric DLP projection light path with an infrared waveband is realized. The optical engine has the characteristics of applicability to infrared wavebands, telecentric projection, simple manufacturing, high reliability, convenience of optimization and relatively low cost.

Description

Technical field: [0001] The invention relates to an optical system, in particular to an infrared optical system of digital light processing (DLP), which is used in the field of infrared scene simulation. Background technique: [0002] Infrared dynamic scene simulation technology is based on computer, information processing, microelectronics and other high-tech technologies. It combines a large number of infrared simulation tests with limited field tests. It can not only optimize system design and improve system performance, but also timely diagnose and eliminate hidden dangers and Faults can effectively improve the quality of development; in addition, the use of simulation technology can also greatly reduce the number of field experiments, thereby shortening the development cycle, saving development costs, and improving system performance. [0003] The infrared image simulator includes an infrared target and background generation system and an optical system. Its function is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03B21/20G03B21/14G02B27/18G02B27/09G02B13/22G02B13/14
Inventor 蹇毅潘兆鑫施家明朱承希
Owner SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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