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projection lens

A projection lens and objective lens technology, which is applied in the field of projection lenses, can solve the problems of increasing the length of the lens and controlling the difficulty of off-axis aberration, long working distance, and adding lenses, etc., to achieve high uniformity of image plane illumination, small size, good optical performance

Active Publication Date: 2015-09-16
ZHONGSHAN ZHONGYING OPTICAL
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Problems solved by technology

Therefore, the projection lens needs to keep a long rear working distance when matching it, which greatly increases the difficulty of controlling the length of the lens and off-axis aberration. The measure is generally to increase the number of lenses, generally more than ten, which makes the lens more complicated
In addition, since the projector adopts 100% compensation in order to ensure the convenience of use, when the viewing angle increases, there will be obvious distortion

Method used

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Embodiment Construction

[0026] Below in conjunction with accompanying drawing and embodiment the present invention is described in detail:

[0027] As shown in the figure, the projection lens includes a main body housing and an objective lens assembly, wherein the objective lens assembly is composed of a negative lens L1, a positive lens L2, a negative lens L3, a positive lens L4, and a negative lens L5 arranged on the same optical axis. , composed of positive lens L6 and positive lens L7, and are arranged and assembled in the main body casing from left to right with the imaging side on the left, and a focusing cam is set in the center of the main body casing to realize the whole group of focusing.

[0028] Specifically, a stop is provided on the negative lens L3, the negative lens L1 is a single negative lens with a convex surface on the imaging side; the positive lens L2 is a biconvex single positive lens with a convex surface on the imaging side. The negative lens L3 is a single negative lens havi...

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Abstract

The invention discloses a projection lens. The projection lens comprises a main body shell and an objective lens combination, wherein the objective lens combination is composed of a concave lens L 1, a plus lens L 2 and a concave lens L 3, a plus lens L 4, a concave lens L 5, a plus lens L 6, and a plus lens L 7 and the concave lens L 1, the plus lens L 2, the concave lens L 3, the plus lens L 4, the concave lens L 5, the plus lens L 6 and the plus lens L 7 are arranged on the same optical axis and arranged and assembled inside the main body shell and on the left side of an imaging side from left to right. And a focusing cam is arranged in the centre of the main body shell so as to achieve a whole group focusing. The projection lens can be matched with a telecentric lighting system, simple and impact in structure, high in performance cost ratio and capable of achieving obtaining satisfied imaging quality after a long work distance. Meanwhile, the projection lens of different focusing manners is suitable of mass production and selected according to actual structure requirements.

Description

【Technical field】 [0001] The invention belongs to the technical field of digital projectors, and specifically relates to a projection lens used in conjunction with prism lighting optical paths such as TIR and PBS, which is applied to various DLP, LCD, and LCOS digital projectors with image square telecentric optical path systems. . 【Background technique】 [0002] With the development of semiconductor technology in recent years, the projection display industry based on DLP, LCD, LCOS and other technologies has developed rapidly. Over the years, DLP projection display technology has developed rapidly with its rich colors, high-definition images, high-brightness images and high-contrast displays. It can achieve smaller and lighter product features. [0003] As a result, DLP micro-projectors have also developed rapidly. The core component of DLP technology mainly adopts DMD digital image chip. DMD is a digital image chip exclusively mastered and developed by Texas Instruments....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03B13/18G03B13/22G03B13/00G03B1/00
Inventor 晏正涛杨聚庆刘娇月朱佳巍倪江楠
Owner ZHONGSHAN ZHONGYING OPTICAL