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Projection device with automatic focusing function and automatic focusing method thereof

A technology for auto-focusing and projection devices, applied in projection devices, installations, optics, etc., can solve problems such as inability to auto-focus, inability to detect clear images, etc.

Inactive Publication Date: 2012-03-21
ASIA OPTICAL CO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a projection device with an automatic focus function and an automatic focus method for the defects that the projection device in the prior art cannot automatically focus, or can not detect whether the image is clear or not although it can automatically focus , to ensure that the image projected on the screen is correct and clear after the focusing action is completed

Method used

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  • Projection device with automatic focusing function and automatic focusing method thereof
  • Projection device with automatic focusing function and automatic focusing method thereof
  • Projection device with automatic focusing function and automatic focusing method thereof

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Embodiment Construction

[0016] The present invention will be described in detail below with preferred embodiments of the present invention and accompanying drawings.

[0017] first, figure 1 It is a flow chart of the method of the present invention, and the automatic focusing method of the projection device of a preferred embodiment of the present invention is described as follows in conjunction with the flow chart:

[0018] In this embodiment, the first imaging lens is used to project the image light source onto the screen to form an image.

[0019] The image on the screen is imaged to the image sensing unit by using the second imaging lens. Wherein, the image sensing unit is used to sense an optical image and convert it into an electrical signal for subsequent calculation and processing. The image processing unit may be, but not limited to: Charge-coupled Device (CCD), Complementary Metal-Oxide-Semiconductor (Complementary Metal-Oxide-Semiconductor, CMOS) and the like.

[0020] Bring this second...

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PUM

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Abstract

The invention relates to a projection device with an automatic focusing function and an automatic focusing method thereof. The steps are as follows: imaging an image which is projected on a screen by a first imaging lens by utilizing a second imaging lens on an image sensing unit; moving the second imaging lens, stating the image sensing unit to capture an image produced by the second imaging lens each time after the second imaging lens is moved, and calculating the definitions of the captured image; and comparing the definitions and obtain a largest value of all, and the position of the second imaging lens which corresponds to the largest value is a focusing position of the second imaging lens. Sequentially, moving the first imaging lens, each time after the first imaging lens is moved, capturing an image produced by the second imaging lens and calculating the definitions of the images; comparing the definitions of the images so as to obtain the largest value of all, and the positionof the first imaging lens which corresponds to the largest value is a focusing position of the first imaging lens.

Description

technical field [0001] The present invention relates to a projection device, in particular to a projection device with an automatic focus function and an automatic focus method thereof. Background technique [0002] Projectors have been widely used in business, education, and life. Especially for the convenience of portability, many miniaturized projectors have appeared on the market in recent years. Among them, there are still photography functions, dynamic photography functions or mobile phones in one. machine. [0003] In the use of the projector, in order to project a clear image on the screen, the user must manually adjust the position of the projection lens of the projector on its optical axis so that the image surface of the projection lens is on the same plane as the screen , which is commonly referred to as focus. Most of the projectors currently sold on the market require the user to manually control the focus. [0004] As far as larger projectors are generally ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03B21/53G02B7/36
Inventor 熊坚智
Owner ASIA OPTICAL CO INC
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