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Auto focus projection system

An automatic focus and projection system technology, applied in the field of projection systems, can solve problems such as inconvenient operation, and achieve the effect of automatic focus function and convenient use

Active Publication Date: 2016-05-25
BUTTERFLY TECH SHENZHEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the above-mentioned defects of the prior art, the present invention solves the problem that the traditional projection system needs to adjust the focus twice and the operation is very inconvenient

Method used

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Embodiment Construction

[0022] like figure 2 As shown, in the first embodiment of the present invention, the automatic focusing projection system includes a projection module, an infrared monitoring module 300, an infrared light source 400, and a focusing device. The infrared monitoring module 300 includes a monitoring objective lens and a sensor chip 301 arranged in the monitoring objective lens. The light spot 700 emitted by the infrared light source 400 should be kept clear at any distance within the working distance range, so as to be used as a reference for focusing. At this time, the angle of the outgoing light of the infrared light source 400 should be less than 2 degrees. The infrared light source 400 may also include a collimated laser light source.

[0023] like image 3 As shown, the projection module further includes a projection light source 100, and a projection objective lens 200 connected to the projection light source 100. The projection objective lens 200 includes a casing, a fi...

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Abstract

The present invention relates to an automatic focusing projection system in order to solve problems that the traditional projection system needs focusing twice, etc. The projection system comprises a projection module, an infrared monitoring module (300), an infrared light source (400) installed on the projection module, and a focusing set which is used to drive a first lens group (201) to move back and forth. Infrared light spots sent out by the infrared light source fall in the monitoring range of the infrared monitoring module, are favorably projected in or at the edge of a projection image of the projection module, and are reflected and then transmitted to the infrared monitoring module via the first lens group and a light splitting component in sequence. After analyzing an infrared light spot image collected by the infrared monitoring module, a control signal is sent to a focusing motor to adjust the first lens group to an appropriate position, and thus an automatic focusing function could be achieved.

Description

technical field [0001] The invention relates to a projection system, more specifically, to a projection system with infrared monitoring and automatic focus adjustment. Background technique [0002] like figure 1 As shown, in the Chinese Utility Model Patent No. 200820071126.8, a "large-screen infrared monitoring projection objective lens" is disclosed. In order to solve the focusing problem of the projection objective lens and the infrared monitoring objective lens, two focusing devices are provided, respectively These are the projection focusing device 17 and the monitoring focusing device 19 . That is to say, in this patent, the projection objective lens and the infrared monitoring objective lens need to be separately focused. [0003] figure 1 The labels are: single negative lens 1, single negative lens 2, single negative lens 3, single positive lens 4, dichroic prism 5, single positive lens 6, single negative lens 7, cemented lens 8, cemented lens 9, single positive ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03B21/14G03B21/20G03B21/53G02B13/14G02B27/10
Inventor 那庆林黄彦麦浩晃王海湘
Owner BUTTERFLY TECH SHENZHEN
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