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Projection lens and projection device

A projection lens and projection device technology, applied in projection devices, optics, instruments, etc., can solve the problem of high manufacturing cost of short-focus projection lenses, meet the advantages of price and mass production, correct image distortion, and eliminate horizontal color. The effect of aberration

Active Publication Date: 2015-12-16
QISDA OPTRONICS (SUZHOU) CO LTD +1
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  • Abstract
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Problems solved by technology

A common short-focus projection lens design uses five lenses to form two groups of variable power lens groups, in which the first lens group relatively close to the projection screen has negative diopter to diverge light, and the second lens group relatively far away from the projection screen The group has a positive diopter to converge light, but this design usually uses high-priced aspheric lenses to eliminate lateral color aberration (LateralColorAberration), which leads to high manufacturing costs for short-focus projection lenses

Method used

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  • Projection lens and projection device
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  • Projection lens and projection device

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Embodiment Construction

[0035] In order to have a further understanding of the purpose, structure, features, and functions of the present invention, the following detailed descriptions are provided in conjunction with the embodiments.

[0036] Certain terms are used in the description and claims to refer to particular elements. Those of ordinary skill in the art will appreciate that manufacturers may refer to the same element by different terms. The specification and claims do not use the difference in name as a way to distinguish components, but use the difference in function of components as a criterion for distinguishing. "Include" mentioned throughout the specification and claims is an open term, so it should be interpreted as "including but not limited to".

[0037] see figure 1 , which is a schematic diagram of the projection device 10 proposed by the embodiment of the present invention. Such as figure 1 As shown, the projection device 10 is used to project images onto a screen 12 to displa...

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Abstract

The invention discloses a projection lens and a projection device. The projection lens is applied to image projection of the projection device. The projection device is used for projecting an image to a screen and comprises an imaging unit. The projection lens comprises a first lens group and a second lens group. The first lens group has negative diopter. The first lens group is adjacent to the screen and is provided with a first lens which has first negative diopter. The second lens group has positive diopter. The second lens group is adjacent to the imaging unit and comprises a second lens which has second negative diopter. The abbe number of the first lens is Vd1, the abbe number of the second lens is Vd2, and 0.4<=Vd2 / Vd1<=1.2 and Vd1<50 so that image distortion can be effectively corrected and lateral chromatic aberration can be eliminated.

Description

technical field [0001] The invention relates to a projection lens and a projection device with the projection lens, in particular to a projection lens with short-focus projection function and a projection device with the projection lens. Background technique [0002] With the advancement of technology, projectors are often used to display video data in conference presentations. In order to match the size of the meeting room, the ultra-short-throw projection lens has gradually become the mainstream of the market due to its advantages of portability and convenient focusing. A common short-focus projection lens design uses five lenses to form two groups of variable power lens groups, in which the first lens group relatively close to the projection screen has negative diopter to diverge light, and the second lens group relatively far away from the projection screen The group has a positive diopter to converge light, but this design usually uses a high-priced aspheric lens to el...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B13/18G03B21/14
Inventor 林明坤
Owner QISDA OPTRONICS (SUZHOU) CO LTD
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