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Method for producing back projection screen with flatness controlled within 0.0005

A production method and rear projection technology, applied in manufacturing tools, glass tempering, glass manufacturing equipment, etc., can solve the problems of large thickness tolerance, uneven heating of glass, etc., to achieve the elimination of thickness tolerance, The effect of eliminating raindrops and improving the uniformity of refraction

Inactive Publication Date: 2008-12-24
吴勇
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional glass tempering process of glass molds adopts the method of roller conveying high-temperature tempering treatment, which has the following disadvantages: when the untempered glass rolls on the transmission roller, because the roller and glass are two different media, During the high-temperature tempering process of glass, when the rollers are in contact with the glass, there will be a temperature difference between the contact surface and the non-contact surface, resulting in uneven heating when the glass is tempered up and down. In addition, in the high-temperature tempering process, the glass is conveyed by roller transmission. When the temperature of the glass itself is very high, when the roller is driven, it will produce rain on the contact surface with the glass.
The mold made of this glass and the screen made of this mold have the following disadvantages: the thickness tolerance is large, usually between 1% and 5‰, the phenomenon of rain and glass roots is obvious, the incident light is refracted unevenly, and the image is blurred. Slight deformation and uneven light and dark

Method used

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  • Method for producing back projection screen with flatness controlled within 0.0005
  • Method for producing back projection screen with flatness controlled within 0.0005
  • Method for producing back projection screen with flatness controlled within 0.0005

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A production method of a rear projection screen whose flatness is controlled within 5 / 10,000 is as follows:

[0025] First select the glass, according to the specifications of the rear projection screen to be made, select a thickness of 10mm, two pieces of 600mm×800mm, two pieces of 2000mm×3000mm, on the four corners of the selected glass, use a 1.3mm glass drill bit on the glass Drill four process holes at 10mm positions on both sides; use a 1mm thick steel wire rope to pass through the drilled process holes and fix and hang the glass at the same time; then move the suspended glass into the tempering furnace in parallel and fix it ; Then master the time and temperature of the glass in the tempering furnace. The ordinary roller glass tempering time is about 450 seconds, and the suspension type tempering time is 850 seconds; then take out the tempered glass for single piece data testing, and then according to The data values ​​of a single piece are matched scientifically...

Embodiment 2

[0027] A production method of a rear projection screen whose flatness is controlled within 5 / 10,000 is as follows:

[0028] First select the glass, according to the specifications of the rear projection screen to be made, select a thickness of 10mm, four pieces of glass with a size of 600mm×800mm, and four pieces of glass between 2000mm×2500mm, and use a 1.4mm glass drill bit on the four corners of the selected glass Drill four process holes at 10mm positions on both sides of the glass; use a 1mm thick steel wire rope to pass through the drilled process holes and fix and suspend the glass at the same time; then move the suspended glass into the tempering furnace in parallel And fix it; then master the time and temperature of the glass in the tempering furnace. The ordinary roller type glass tempering time is about 450 seconds, and the suspension type tempering time is 900 seconds; then take out the tempered glass for single piece data testing , and then carry out scientific pa...

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Abstract

The invention relates to a production method of a back-projection screen, the smoothness of which is controlled within five-ten thousandths. The method comprises the following steps: first, the glass is selected, and four fabrication holes are respectively drilled at the four corners of the selected glass according to the specification of the back-projection screen to be produced, simultaneously, the glass is fixed and suspended, and the glass matched in pairs is marked, then the toughened glass meeting the standard is selected, a glass mold of the back-projection screen is manufactured according to the selected and matched toughened glass; the toughened glass mold is filled with a thermoplastic optical material after being tempered, and die sinking is carried out to take out the screen. The production method of the invention has the advantages that: by adopting the production method, the temperature of the glass is even and consistent from top to bottom when the glass is toughened; the back-projection screen produced by the toughened glass mold prepared by the toughened glass eliminates the problems of silk rain phenomenon and large positive and negative common difference of thickness of the screen basically, and can improve the refraction uniformity of the incident ray greatly.

Description

technical field [0001] The invention belongs to the field of projection optical display technology manufacturing, and relates to the preparation of a toughened glass mold for producing rear projection screens. Using the mold, a rear projection screen with a thickness of 3mm-5mm can be obtained, and its flatness can be controlled at 1 / 10,000 Ultra-flat high-definition optical rear projection screen within five. Background technique [0002] Common glass molds are usually used to manufacture rear projection screens in the prior art. The traditional glass tempering process of glass molds adopts the method of roller conveying high-temperature tempering treatment, which has the following disadvantages: when the untempered glass rolls on the transmission roller, because the roller and glass are two different media, During the high-temperature tempering process of glass, when the rollers are in contact with the glass, there will be a temperature difference between the contact surf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03B21/56C03B27/00
Inventor 吴勇
Owner 吴勇