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Anti-heat and out-of-focus projection device

A projection device and heat-proof technology, applied in the field of projection display, can solve problems such as lens and lens barrel position offset, projection picture blur, projector lens barrel out of focus, etc., so as to improve optical machine lens barrel out of focus and improve projection Clarity, effect of material cost reduction

Active Publication Date: 2021-12-07
APPOTRONICS CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, an important defect of anti-heat and out-of-focus projection devices such as smart projectors is that the temperature inside the body rises sharply after working for a period of time, and thermal expansion and contraction cause a slight shift in the position of the lens and lens barrel, and the projection screen changes accordingly. get blurred
The existing technology mainly solves the out-of-focus problem of the projector lens barrel from two aspects. One is to replace the plastic lens and lens barrel with glass lens and metal lens barrel, but this will greatly increase the cost; the other method is to use autofocus , but the use of autofocus still has the steps of focusing during the viewing process, which brings inconvenience to users

Method used

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  • Anti-heat and out-of-focus projection device

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0029] see figure 1 The anti-thermal defocusing projection device 1 provided by the first embodiment of the present invention includes a lens barrel 10 and a temperature adjustment assembly 20. The temperature adjustment assembly 20 forms a heat exchange relationship with the lens barrel 10, and is used to maintain the temperature of the lens barrel at a preset temperature. Temperature, the preset temperature may be a point value, such as 50 degrees Celsius, or a range, such as 40 degrees Celsius to 60 degrees Celsius.

[0030] In this embodiment, the preset temperature is specifically the stable working temperature of the anti-thermal defocus projection device 1. For example, it can be preset that the internal temperature of the whole product reaches a stable working temperature half an hour after starting up, and the stable working temperature is 40 Celsius to 60 Celsius, the stable working temperature of different products is not the same, at the same time, the stable worki...

no. 2 example

[0038] see figure 2 The anti-thermal defocus projection device 2 provided by the second embodiment of the present invention includes a lens barrel 10 (substantially the same as the lens barrel 10 of the first embodiment) and a temperature adjustment assembly 30, and the temperature adjustment assembly 30 forms a heat exchange with the lens barrel 10 The relationship is used to keep the temperature of the lens barrel at a preset temperature, and the preset temperature can be a point value, such as 50 degrees Celsius, or a range, such as 40 degrees Celsius to 60 degrees Celsius.

[0039] In this embodiment, the preset temperature is specifically the room temperature of the environment where the thermal defocusing prevention projection device 2 is located.

[0040] The temperature adjustment assembly 30 includes a controller 31, a heat dissipation element 32 and a temperature sensor 33, the temperature sensor 33 is located on the outer surface 100 of the lens barrel 10, and is c...

no. 3 example

[0048] see image 3 The anti-thermal out-of-focus projection device 3 provided by the third embodiment of the present invention includes a lens barrel 10 (which is basically the same as the lens barrel 10 in the first embodiment) and a temperature adjustment assembly 40 .

[0049] The temperature adjustment assembly 40 includes cooling fins 41, the cooling fins 41 are located in the circumferential direction of the lens barrel 10, and extend vertically to the outer surface 100 of the lens barrel 10, and the heat dissipation surface area of ​​the lens barrel 10 is increased by using its dense sheet structure. Thus, the temperature of the lens barrel 10 is effectively reduced. Since the temperature at the junction of the lens barrel 10 and the internal lens is higher, the out-of-focus phenomenon is more obvious, and the number and / or length of the cooling fins 41 can be increased at the position of the corresponding outer surface of the lens to further reduce the temperature of ...

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Abstract

The invention provides a projection device for preventing thermal defocusing, which includes a lens barrel and a temperature adjustment assembly, the temperature adjustment assembly forms a heat exchange relationship with the lens barrel, and is used to keep the temperature of the lens barrel at a preset temperature, thereby improving the optical-mechanical lens barrel The out-of-focus condition of the optical-mechanical lens barrel caused by the deformation caused by thermal expansion and contraction under the influence of temperature improves the projection clarity of the projection device, reduces the material cost, does not need to be adjusted during use, and is convenient to use.

Description

technical field [0001] The invention relates to the field of projection display, in particular to a projection device for preventing thermal defocusing. Background technique [0002] At present, an important defect of anti-heat and out-of-focus projection devices such as smart projectors is that the temperature inside the body rises sharply after working for a period of time, and thermal expansion and contraction cause a slight shift in the position of the lens and lens barrel, and the projection screen changes accordingly. Get blurred. The existing technology mainly solves the out-of-focus problem of the projector lens barrel from two aspects. One is to replace the plastic lens and lens barrel with glass lens and metal lens barrel, but this will greatly increase the cost; the other method is to use autofocus , but the use of autofocus still has the steps of focusing during the viewing process, which brings inconvenience to users. Contents of the invention [0003] In vi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B7/02G03B21/16
CPCG02B7/028G03B21/16G02B7/02G03B21/14
Inventor 刘海涛亓森林谢颂婷李屹
Owner APPOTRONICS CORP LTD