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Short focal length engineering projection lens

A projection lens and engineering technology, applied in the field of projection lenses, can solve the problems of long cycle, high cost, difficult lens processing, etc., and achieve the effect of low cost

Pending Publication Date: 2019-02-01
HUZHOU SINOVA TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems existing in the prior art, the present invention proposes a short-focus engineering projection lens that solves the problems of long projection distance, difficult lens processing, long cycle and high cost.

Method used

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  • Short focal length engineering projection lens

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example 1

[0030] Object-image distance: 1195.2mm. Wherein, the total length of the lens is 152.4mm (that is, the length from the apex of the outer surface of the first lens 1 to the apex of the outer surface of the twelfth lens 12).

[0031] The object plane distance is 1000 mm (that is, the distance from the vertex of the outer surface of the first lens 1 to the object plane).

[0032] The distance between the image planes is 42.8mm (that is, the distance from the apex of the outer surface of the twelfth lens 12 to the image plane, including 1.3mm air space + 26mm K9 glass + 15.5mm air space, converted to a total air space distance of 33.94mm).

[0033] The size of the image plane is 21.1mm, corresponding to the size of the object plane is 2467.4mm, the magnification ratio is about 116.9 times under the condition of the object-image distance announced above, and the half field angle is about 50°.

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Abstract

The invention discloses a short focal length engineering projection lens, which belongs to the technical filed of projection lens. The engineering projection lens sequentially comprises the followinglenses from an object side to an image side along an optical axis: a first lens with a positive refractive power, a second lens, a third lens with a negative refractive power, a fourth lens with the negative refractive power, a fifth lens with the negative refractive power, a sixth lens with the positive refractive power, a seventh lens with the negative refractive power, an eighth lens with the positive refractive power, a ninth lens with the negative refractive power, a tenth lens with the positive refractive power, an eleventh lens with the positive refractive power, and a twelfth lens withthe positive refractive power. The first lens, and the third lens to the twelfth lens are all spherical lenses. The second lens is an aspheric lens. An aperture is provided between the seventh lens and the eighth lens. The short focal length engineering projection lens can project a larger projection image at a shorter projection distance.

Description

technical field [0001] The invention belongs to the technical field of projection lenses, in particular to a short-focus engineering projection lens. Background technique [0002] According to the classification of image displays, the current image display technology of front projection projectors is mainly divided into three major technical fields: 3LCD, DLP, and LCOS. The lens of 3LCD projectors generally adopts telecentric optical design, which is realized in two ways: the first is that it is composed of about ten pieces of various spherical lenses, and its characteristics are: the projection distance is long, and the projection distance is about 3 meters. About 70-inch screen; due to the use of spherical lenses, it can be processed by ordinary glass grinding. The second is to change at least two to three spherical lenses into plastic aspheric lenses on the basis of the first one. Its characteristics are: the projection distance can be shortened, so that it can project w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B13/00G02B13/18G02B1/04G02B1/00
CPCG02B13/0045G02B13/006G02B13/18G02B1/00G02B1/041
Inventor 李卫华郑占清
Owner HUZHOU SINOVA TECH