Automatic focus porjector and automatic focus method thereof

一种自动聚焦、投影仪的技术，应用在投影仪领域，能够解决耗费较长自动聚焦调整等问题，达到缩短调整时间、良好精确度的效果

Inactive Publication Date: 2008-05-14
HONG FU JIN PRECISION IND (SHENZHEN) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the problem with this method is that in the state close to the focus alignment, with the focus moving, the contrast and brightness image parameters change very little, and it usually requires multiple acquisitions of predetermined test patterns for parameter comparison, so generally It takes a long time to adjust the auto focus

Method used

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  • Automatic focus porjector and automatic focus method thereof
  • Automatic focus porjector and automatic focus method thereof
  • Automatic focus porjector and automatic focus method thereof

Examples

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Embodiment Construction

[0017] A preferred embodiment of the autofocus projector involved in the present invention is described in detail below with reference to the accompanying drawings:

[0018] Such as figure 1 As shown, the projector 100 includes an ultrasonic transmitting and receiving module 300 , a data processing module 400 and an output module 500 which are electrically connected in sequence. The ultrasonic transmitting and receiving module 300 is used for transmitting and receiving ultrasonic waves, and calculates the propagation time Δt of ultrasonic waves from transmitting to receiving. The data processing module 400 is used to calculate the projection distance Δs between the projector 100 and the display screen 200 by the formula Δs=v·Δt / 2 according to the propagation time Δt, and provide the zoom parameter value that best matches the current projection distance Δs and focusing parameter values. The output module 500 is used for clearly projecting the modulated image light onto the di...

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Abstract

The invention provides an automatic focusing method for a projector. The method comprising the steps as follows: an ultrasonic wave signal is generated by an ultrasonic wave generating unit; the ultrasonic wave signal is modulated by a modulating unit; the ultrasonic wave is emitted and received by an ultrasonic wave receiving and emitting module; the received ultrasonic wave signal is demodulated by a demodulating unit; the transmission time of ultrasonic wave from emitting to receiving is detected by a timing unit; the distance between the projector and the displaying screen is detected by a data processing module and a zooming parameter signal and a focusing parameter signal are output by the data processing module; a zooming motor and a focusing motor are driven by an output module to act, so that the zooming parameter value and the focusing parameter value can be respectively adjusted by a zooming lens and a focusing lens; and then the image is projected on the display screen. Besides, the invention also provides an automatic focusing projector with the method mentioned above.

Description

technical field [0001] The invention relates to a projector, in particular to an automatic focusing projector and an automatic focusing method thereof. Background technique [0002] As an image projection and magnification device, the projector is widely used in teaching, training, conferences and other occasions. The projector mainly uses the liquid crystal unit or DMD (Digital Micromirror Device, digital microreflector) microchip according to the input image signal to modulate the illumination light emitted by the light source into the image light for displaying the image, and then amplifies the image light through the optical lens system. Projected onto the display screen, it is convenient for teaching, training, conferences and other occasions for demonstration purposes. [0003] For traditional projectors, users often need to adjust the focal length and focus position of their optical lens system according to their placement, so that the images projected on the display...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03B21/53G03B21/00
CPCG03B21/53H04N9/3102H04N9/317H04N9/3194
Inventor 翁世芳丁林坤
Owner HONG FU JIN PRECISION IND (SHENZHEN) CO LTD
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