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Projection camera lens

A projection lens and projection technology, applied in the field of projection lenses, can solve the problems of complex structure, high price, difficult control of yield rate, etc., and achieve the effect of high light utilization efficiency, low cost, and large display size

Active Publication Date: 2013-02-20
深圳市安华光电技术股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to obtain good display image quality and larger projection screen size (in the case of throw ratio <1.5), the projection lens usually has a complicated structure, and the number of lenses generally exceeds 8 pieces; due to the high price of glass materials, complex processing and assembly processes, good Ratio is not easy to control, and existing projection lenses are usually expensive

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] In the imaging system provided by Embodiment 1 of the present invention, the projection imaging system has a half field of view FOV.=38.38°, the projection imaging system focal length f'=10.0 mm, and the projection imaging system object space NA=0.204. The lens components are arranged sequentially from the light splitting device to the display screen as follows: figure 1 As shown, aspherical biconvex lens [L1]; spherical biconvex lens [L2]; spherical biconvex lens [L3]; spherical plano-convex lens [L4] with a convex surface on the display device side; spherical biconvex lens [L5]; aspheric crescent The lens [L6] has a convex surface on one side of the screen; the spherical biconvex lens [L2], the spherical biconcave lens [L3] and the spherical plano-convex lens [L4] are cemented to form a triplet lens; the stop is located between the spherical plano-convex lens [L4] and the aspheric surface Between the crescent lens [L5]. The parameters of each lens are shown in Table ...

Embodiment 2

[0071] Embodiment 2 of the present invention will only describe the different parts from Embodiment 1. In the imaging system provided in Embodiment 2, the half field of view angle FOV.=38.38° of the projection imaging system, and the focal length f'=10.0mm of the projection imaging system; The object space NA=0.2316 of the imaging system. The lens components are arranged sequentially from the light splitting device to the display screen as follows: Figure 6 As shown, wherein, [L4] is a spherical crescent lens, and the spherical double-convex lens [L2] is cemented with the spherical double-concave lens [L3] to form a doublet lens. The parameters of the projection lens are shown in Table 4 below:

[0072]

[0073] Table 4. Embodiment 2 Lens Structure Parameters

[0074] The serial numbers of the two surfaces of the aspheric biconvex lens [L1] are 6 and 7, and the serial numbers of the surfaces of the aspheric crescent lens [L6] are 17 and 18. The parameters of the aspheric...

Embodiment 3

[0079] Embodiment 3 of the present invention will only describe the parts different from Embodiment 1. In the imaging system provided in Embodiment 3, the half field of view angle FOV.=33.43° of the projection imaging system, and the focal length f'=12.0mm of the projection imaging system; The object space NA=0.204 of the imaging system. The lens components are arranged sequentially from the light splitting device to the display screen as follows: Figure 11 As shown, wherein, [L4] is a spherical crescent lens, and the spherical double-convex lens [L2] is cemented with the spherical double-concave lens [L3] to form a doublet lens. The parameters of the projection lens are shown in Table 6 below:

[0080]

[0081] 6. Embodiment 3 Lens Structure Parameters

[0082] The serial numbers of the two surfaces of the aspheric biconvex lens [L1] are 6 and 7, and the serial numbers of the surfaces of the aspheric crescent lens [L6] are 17 and 18. The parameters of the aspheric surfa...

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Abstract

The invention relates to a projection camera lens, comprising a lens assembly. A projection imaging system is formed by the lens assembly, a display device, a light splitting device and a display screen, wherein the projection imaging system meets the following parameter conditions that FOV. is more than or equal to 29 degrees and is less than or equal to 39 degrees; f' is more than or equal to 10.0 mm and less than or equal to 14.0 mm; and NA is more than or equal to 0.204 and less than or equal to 0.232. The FOV. represents a half view field angle of the projection imaging system; the f' represents a focal length of the projection imaging system; and the NA represents an object space numerical value pore diameter of the projection imaging system. The projection camera lens disclosed by the invention is matched with a DMD (Digital Micro mirror Device) or LCOS (Liquid Crystal on Silicon) display device and a corresponding illumination light path; a light beam which is modulated by the display device is collected and focused to the display screen; and the projection camera lens has the characteristics of large display size, high light utilization rate, low cost and the like.

Description

technical field [0001] The invention relates to the technical field of digital projection display, and more specifically, relates to a projection lens used on a DLP or LCOS projection light machine. Background technique [0002] The existing digital projection display technology mainly uses DMD or LCOS as the display device, and uses polarization beam splitter (PBS) or total reflection beam splitter (TIR) ​​as the illumination / imaging beam splitter. The reflected image is focused onto the display screen. In order to obtain good display image quality and larger projection screen size (in the case of throw ratio <1.5), the projection lens usually has a complicated structure, and the number of lenses generally exceeds 8 pieces; due to the high price of glass materials, complex processing and assembly processes, good The rate is not easy to control, and existing projection lenses are usually expensive. Contents of the invention [0003] The technical problem to be solved ...

Claims

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Application Information

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IPC IPC(8): G02B13/00G02B13/18
Inventor 李恒白陈双安
Owner 深圳市安华光电技术股份有限公司
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