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Focusing method and focusing device of projection machine and projection machine

A technology of projection optics and optics, applied in the field of projection, can solve the problems of increasing the cost of the projection system, blurred images, defocusing of optics and optics, etc., and achieves the effects of improving defocusing of optics optics, improving precision, and reducing material cost.

Active Publication Date: 2017-09-26
BOE TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The presentation of the projection system is mainly through the "light machine". The light source of the light machine mainly comes from three types: light bulbs, LED lights and lasers. However, no matter what kind of light source is in the process of generating light, it will emit a lot of heat. The optical-mechanical lens is more prone to thermal expansion and contraction, resulting in slight deformation, which will cause the optical-mechanical lens to lose focus during long-term operation, that is, the image presented on the screen is blurred, and the projection focal length needs to be readjusted to make the picture clear
[0004] At present, in order to reduce the deformation of the optical-mechanical lens due to thermal expansion and contraction, high-end projectors usually use an all-metal structure shell, and the optical-mechanical lens uses an all-glass lens instead of a resin lens, which is conducive to the heat dissipation of the optical-mechanical lens , thereby reducing its deformation, but this greatly increases the cost of the projection system

Method used

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  • Focusing method and focusing device of projection machine and projection machine
  • Focusing method and focusing device of projection machine and projection machine
  • Focusing method and focusing device of projection machine and projection machine

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Experimental program
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Embodiment 1

[0045] This embodiment provides a focusing method of a projection light machine, such as figure 1 with figure 2 Shown, including:

[0046] Step S10: Detect the actual deformation of the optical machine lens.

[0047] Step S11: Control and adjust the focal length of the optical lens according to the actual deformation of the optical lens.

[0048] The focusing method detects the actual deformation of the optomechanical lens in real time, and adjusts its focal length in real time according to the actual deformation of the optomechanical lens, which can greatly improve the accuracy of the focal length adjustment of the optomechanical lens, thereby greatly improving the sensitivity of the optomechanical lens. Temperature affects the deformation of the optical machine lens caused by thermal expansion and contraction, which greatly improves the projection clarity of the projector optical machine. At the same time, compared with the existing scheme of changing the material of the projector...

Embodiment 2

[0064] This embodiment provides a focus adjustment method for a light projection machine. The difference from Embodiment 1 is as follows: Figure 4 As shown, step S10: detecting the actual deformation of the optical machine lens includes:

[0065] Step S101': setting a deformation sensor on the optical lens.

[0066] Step S102': Detect the actual deformation of the optical lens with the temperature change through the deformation sensor.

[0067] The other steps of the focusing method in this embodiment are the same as those in Embodiment 1, and will not be repeated here.

[0068] In this embodiment, in the process of detecting the actual deformation of the optical machine lens, the deformation sensor itself is no longer compensated. Compared with the method of reducing the defocus of the optical machine lens in the prior art, the focus adjustment is The method can also improve the adjustment accuracy of the focal length of the optical machine lens, thereby greatly improving the deform...

Embodiment 3

[0073] This embodiment provides a projection light machine, including the focusing device in Embodiment 1 or 2.

[0074] By adopting the focusing device in embodiment 1 or 2, the focus adjustment accuracy of the projector optical machine is improved, and the deformation of the optical machine lens caused by the deformation of the optical machine lens due to thermal expansion and contraction caused by temperature is improved. Thus, the projection clarity of the projector is greatly improved.

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Abstract

The invention provides a focusing method and a focusing device of a projection machine and the projection machine. The focusing method comprises the following steps: detecting the actual deformation quantity of a projection machine lens; and controlling and adjusting the focal distance of the projection machine lens according to the actual deformation quantity of the projection machine lens. According to the focusing method of the projection machine, the actual deformation quantity of the projection machine lens is detected in real time, and the focal distance of the projection machine lens is controlled and adjusted in real time according to the actual deformation quantity of the projection machine lens, and the focal distance adjustment precision of the projection machine lens can be greatly improved, so that the condition that the projection machine lens is out of focus, which is caused by deformation generated by heat expansion and cold contraction due to the fact that the projection machine lens is influenced by temperature is greatly improved, and then the projection definition of the projection machine is greatly improved; and moreover, compared with an existing scheme for changing the materials of the shell and the lens of the projection machine, the material cost of the projection machine is further reduced due to the focusing method.

Description

Technical field [0001] The invention relates to the field of projection technology, in particular to a focusing method, a focusing device and a projection optical machine. Background technique [0002] In recent years, with the rapid development of smart projection, excellent image presentation methods and competitive prices have quickly gained a larger share of the market. Projection system, also known as projector, refers to a device that projects pictures, text, or video onto a screen or wall through projection. [0003] The presentation mode of the projection system is mainly presented by the "optical machine". The light source of the optical machine mainly comes from three types: bulbs, LED lamps and lasers. However, no matter what kind of light source emits a lot of heat in the process of generating light, The lens of the optical machine is more prone to thermal expansion and contraction, resulting in slight deformation, which causes the optical machine lens to lose focus du...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03B21/14G03B21/53G02B7/02G02B7/04H04N9/31
CPCG02B7/028G02B7/04G03B21/142G03B21/53H04N9/317G02B7/28G02B7/08
Inventor 关红涛董文储闫俊伟张莹李太亮
Owner BOE TECH GRP CO LTD