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90-degree turning rear-projection object lens

A technology for rear projection and objective lens, applied in the field of projection objective lens, can solve the problems of unreasonable structure, large thickness of the casing, colored edges, etc., and achieve the effects of reducing the production cost, improving the production process, and increasing the transmittance.

Active Publication Date: 2006-08-09
SHENZHEN KECHUANG DIGITAL DISPLAY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Known projection objective lens, its structure is mostly straight cylindrical, and the number of lenses is generally more than 11. Due to the unreasonable structure of this type of objective lens and the large number of lenses, etc., the thickness of the casing is large and the picture definition is poor. , poor optical uniformity, distortion, colored edges and other defects
Therefore, the development of rear projection technology is limited

Method used

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  • 90-degree turning rear-projection object lens
  • 90-degree turning rear-projection object lens
  • 90-degree turning rear-projection object lens

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1: a kind of 90 degree angle projection objective lens, its structure is as figure 1 As shown, a total of 9 lenses are used, of which the lens (2) is a PMMA plastic sheet, the concave surface is aspherical, the lenses (7) and (8) are double-bonded sheets, and the diaphragm is set between (3) and (4) Make the entrance pupil coincide with the front focus of the system. The diaphragm clear aperture is 21.33mm. The parameters of the system are listed in Table 1.

[0024] Face number

radius

interval

Ndvd

Clear aperture

[1]

65.399

2.84

1.638555.48

83.4

[2]

32.808

17.5

62.6

[3]

75.62

4.73

1.4917557.44

62.6

[4]*

20.193

99

51.8

[5]

68.945

3.78

1.772549.6

25

[6]

32.059

29.298

23.4

[STOP]

Infinity

2.815

22.9

[8]

114.632

...

Embodiment 2

[0034] Embodiment 2: a kind of 90-degree angle projection objective lens, the diaphragm aperture is 23.92, each relevant data is listed in Table 3

[0035] Face number

radius

interval

Glass grade

Clear aperture

[1]

64.218

3

1.620460.29

74.8

[2]

29.883

18.68

56.5

[0036] [3]

88.90

5

1.4917557.44

56.5

[4]*

27.099

78.58

55

[5]

50.263

4

1.785944.2

26

[6]

25.781

36.399

23.7

[STOP]

Infinity

1.2

23.92

[8]

137.723

4

1.8466623.8

25

[9]

-117.929

32.51

25.63

[10]

1928.245

6.5

1.49781.6

33

[11]

-46.163

.2

33

[12]

77.57

3

1.806140.7

33

[13]

22.596

0.218

29.4

...

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PUM

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Abstract

Main structure of the projection objective includes following parts: (1) a crescent shaped negative lens prepared from glass and a crescent shaped negative PMMA single sided aspherical lens constitute front set of object lens with negative focal power; centres of sphere of lenses are all toward diaphragm; (2) back set of object lens with positive focal power is composed of lenses with focal power being as negative (N), positive (P), P, N, P, N, P in sequence; the diaphragm is setup between prepositive negative lens and positive lens so that entrance pupil is coincident with object focal point of system; (3) it is setup in 90 degrees between front set of object lens with negative focal power in (1) and back set of object lens with positive focal power in (2); being setup between the front set and the back set, the plane mirror is installed at 45 degrees with optical axis of the front set as well as 45 degrees with optical axis of the back set.

Description

technical field [0001] The invention relates to a projection objective lens in a rear projection device, and mainly refers to a rear projection objective lens rotated at an angle of 90 degrees. Background technique [0002] The projection objective lens is one of the core components of the rear projection digital TV. It uses the LCOS chip as the image plane and the Fresnel projection screen as the object plane. Its structure and quality will directly affect the rear projection effect. In order to ensure that the objective lens can meet the requirements of high imaging quality, certain optical performance indicators should be met, such as short focal length, long back focus, high magnification, high resolution, image plane illuminance, relative distortion, reasonable lens geometry, etc. Known projection objective lens, its structure is mostly straight cylindrical, and the number of lenses is generally more than 11. Due to the unreasonable structure of this type of objective l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B9/64G02B15/00
Inventor 李方红史国发
Owner SHENZHEN KECHUANG DIGITAL DISPLAY TECH