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Short-focus lens of projection system

A technology of projection system and focal lens, which is applied in the field of short-focus lens, can solve the problems of low throw ratio and easy scratch of aspheric lens, and achieve the effect of optimizing aberration

Pending Publication Date: 2018-06-19
AVANZA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a short-focus lens for a projection system, which has a low throw ratio and can avoid the problem that the aspheric lens is easily scratched on the basis of optimizing the aberration

Method used

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  • Short-focus lens of projection system
  • Short-focus lens of projection system
  • Short-focus lens of projection system

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0019] Such as figure 1 As shown, the short-focus lens of the projection system of the present invention includes a lens barrel 1, a lens front group 2 arranged on the front side of the lens barrel 1, and a lens rear group 3 arranged on the rear side of the lens barrel 1. Group 2 sequentially includes a first optical objective lens 21, an aspheric lens 22, and a second optical objective lens 23 from front to back, and the rear lens group 3 includes a third optical objective lens 31, a fourth optical objective lens 32, and a fifth optical objective lens from front to back. The objective lens 33, the sixth optical objective lens 34, the glue objective lens 35, the seventh optical objective lens 36, and the eighth optical objective lens 37. The glue objective lens 34 includes three optical objective lenses, and all the above optical objective lenses are spherical lenses. That is, the short-focus lens corresponding to the projection system of the present invention is provided with...

no. 2 example

[0026] Such as image 3 As shown, in this embodiment, the lens barrel 1' includes an integrally formed front lens barrel 11', a middle lens barrel 12' and a rear lens barrel 13', and the lens front group 2' is arranged on the front lens On the barrel 11', the lens rear group 3' is arranged on the rear lens barrel 13'; the center line of the middle lens barrel 12' is not on the same straight line as the center line of the front lens barrel 11'. An included angle is formed between them, and an included angle is also formed between the centerline of the middle lens barrel 12' and the centerline of the rear lens barrel 13', and the included angles are all less than 180 degrees; the middle lens barrel 12' A reflective mirror 7' is arranged on the inner end surface of the lower side.

[0027] The centerline of the lens rear group 3' is on the same straight line as the centerlines of the prism 4' and the DMD packaging glass 5'.

[0028] The light projected from the DMD chip 6' will...

no. 3 example

[0031] Such as Figure 5 As shown, same as the second embodiment, in this embodiment, the lens barrel 1' also includes an integrally formed front lens barrel 11', a middle lens barrel 12' and a rear lens barrel 13', and the lens front group 2 'is arranged on the front lens barrel 11', and the rear lens group 3' is arranged on the rear lens barrel 13'; the center line of the middle lens barrel 12' is connected with the center of the front lens barrel 11' The lines are not on the same straight line, and an angle is formed between the two, and an angle is also formed between the centerline of the middle lens barrel 12' and the centerline of the rear lens barrel 13', and the angles are all less than 180 degrees; A reflective mirror 7' is arranged on the lower inner end surface of the middle lens barrel 12'.

[0032] The centerline of the lens rear group 3' is on the same straight line as the centerlines of the prism 4' and the DMD packaging glass 5'.

[0033] The light projected...

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Abstract

The invention discloses a short-focus lens of a projection system. The short-focus lens comprises a lens barrel, a front lens assembly disposed at the front side of the lens barrel, and a rear lens assembly disposed at the rear side of the lens barrel; the front lens assembly includes a first optical objective lens, an aspherical lens and a second optical objective lens which are sequentially distributed from the front part to the back part of the front lens assembly; the rear lens assembly includes a third optical objective lens, a fourth optical objective lens, a fifth optical objective lens, a sixth optical objective lens, a cemented objective lens, a seventh optical objective lens and an eighth optical objective lens which are sequentially distributed from the front part to the back part of the rear lens assembly, wherein the cemented objective lens includes three optical objective lenses; all the optical objective lenses mentioned above are spherical lenses, that is to say, 11 spherical optical objective lenses and 1 aspherical lens are provided altogether, and therefore, a projection ratio is low; and the first optical objective lens is disposed at the outermost layer of theshort-focus lens, and therefore, the problem of high possibility of scratching the plastic aspherical lens can be avoided with aberration optimized.

Description

technical field [0001] The invention relates to the field of projection equipment, in particular to a short-focus lens of a projection system. Background technique [0002] As the application fields of engineering projectors become more and more extensive, often due to space constraints, it is required to project a larger picture within a shorter distance, which requires the use of short-focus lenses. At present, the general short-focus lens, the commonly used and most selected lens has a throw ratio of about 0.7 to 0.8. If you want to realize the projection of a larger picture, you must use a projection lens with a shorter focal length. At present, this kind of projection Short-focus projection lenses with a ratio of less than 0.7 are relatively scarce in domestic resources, and the imaging quality is also poor. It is often necessary to use foreign short-focus lenses to match the use of engineering solutions. [0003] Due to the need for design optimization, general short-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B13/00G02B13/18G02B13/24
CPCG02B13/0045G02B13/18G02B13/24
Inventor 徐舟
Owner AVANZA
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