CN2735365Y - Rotation angle type rear-projection object lens - Google Patents
Rotation angle type rear-projection object lens Download PDFInfo
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- CN2735365Y CN2735365Y CN 200420088552 CN200420088552U CN2735365Y CN 2735365 Y CN2735365 Y CN 2735365Y CN 200420088552 CN200420088552 CN 200420088552 CN 200420088552 U CN200420088552 U CN 200420088552U CN 2735365 Y CN2735365 Y CN 2735365Y
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- lens
- lens barrel
- barrel group
- projection object
- corner type
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Abstract
The utility model discloses a rotation angle type rear-projection object lens, which comprises a front lens barrel assembly whose two sides are adjacent to the air, an optical stop, a rear lens barrel assembly, a regulating tube, a flange plate, a reflector mount, and a plane reflector 1 C; the front lens barrel assembly is arranged in sequence with a lens 1 A which is a concave meniscus glass spherical lens, and a lens 1 B which is a concave meniscus single-side aspherical plastic lens; the lenses arranged on the rear lens barrel assembly are all glass spherical lenses, the reflector mount is arranged on the front lens barrel assembly, and the plane reflector 1 C is arranged on the reflector mount; the optical axes of the front lens barrel assembly and the rear lens barrel assembly are positioned in a plane without misalignment, and maintained in certain angle, and the intersection is positioned on the plane reflector 1 C. The rotation angle type rear-projection object lens of the utility model having sharp and clear image, favorable brightness and uniformity, small deformation of the picture, and small color difference of the image, is suitable for the bare engine positioning. A thin back projection TV can be realized by reducing the thickness through the rotation angle type rear-projection object lens.
Description
Technical field
The utility model relates to a kind of turning rear-projection object lens, especially relates to a kind of corner type turning rear-projection object lens that can be used for the back projection imaging.
Background technology
The turning rear-projection object lens that is applied in the back projection television is one of important optics that influences the TV set image quality, it adopts the object space telecentric beam path, is satisfied with the requirement of projection, is object plane with the Fresnel projection screen, with LCOS, DMD or LCD chip is image planes, should have very high image quality.Turning rear-projection object lens need satisfy following optical property index: (1) short focal length, and focal length should be 9～14mm; (2) grow rear cut-off distance, greater than 30mm; (3) high resolving power is greater than 40lp/mm; (4) little chromatic longitudiinal aberration is less than 0.5 pixel; (5) uniform illuminance of image plane, homogeneity 〉=85%; (6) minimum distortion is less than 0.5%; (8) with great visual angle, greater than 70 °.Now, the report of many improved turning rear-projection object lens has been arranged, mainly all formed, as the disclosed projection objective of patent documentation CN1395695A with the lens of air adjacency by at least seven both sides; Patent documentation CN2516988Y also discloses a kind of turning rear-projection object lens of being made up of preceding lens barrel and back lens barrel, on the preceding lens barrel eyeglass 3a～3d is housed, eyeglass 4a～4e is housed on the back lens barrel, eyeglass 3a is a double-sized non-spherical PMMA plastic sheet, eyeglass 4a and 4b are two glue pellet, and diaphragm is positioned on the front focus of back lens barrel.In addition, american documentation literature US2004/0141159A1 also discloses a kind of projection objective device and projector, the light that passes liquid crystal board projects on the screen through a lens devices, and lens devices comprises a diaphragm, and telecentric optics lens combination system is between diaphragm and liquid crystal board; The aperture of diaphragm is positioned at by the original light parallel with optical axis of the liquid crystal board emission intersection point place through telecentric optics lens combination system refraction back and optical axis; The contrast feature of liquid crystal board changes according to the angle and direction of incident ray, and the iris shape of diaphragm is and the corresponding to substantially triangle of the shape of contrast feature.These known turning rear-projection object lens, the optical axis of their all lens all is located on the same line, and makes the use of this turning rear-projection object lens be subjected to certain space constraint.
Summary of the invention
This practical new purpose provides a kind of turning rear-projection object lens of corner type, and the technical scheme of taking in order to realize this purpose is:
Comprise the lens both sides all with the preceding lens barrel group 1 of air adjacency, light hurdle 2, back lens barrel group 3 is regulated tube 4, ring flange 5; Preceding lens barrel group 1 is equipped with lens 1A and 1B successively, and lens 1A is a month recessed glass spherical lens, and lens 1B is a month recessed single face aspherical plastic lens; Back lens barrel group 3 is equipped with lens 2A, 2B, 2C, 2D, 2E, 2F, 2G, 2H and 2I successively, and the lens that back lens barrel group 3 is adorned are the glass spherical lens, and wherein lens 2A, 2B, 2C are three balsaming lenss, and focal power is for negative; Lens 2D, 2E are cemented doublet, and focal power is for negative; Lens 2F is a biconvex lens, and focal power is for just; Lens 2G, 2H are cemented doublet, and focal power is for negative; Lens 2I is a biconvex lens, and focal power is for just; Before light hurdle 2 is positioned at lens 2A; Also comprise mirror base 6 and plane mirror 1C, mirror base 6 is arranged on the preceding lens barrel group 1; Plane mirror 1C is installed on the mirror base 6; The optical axis of preceding lens barrel group 1 does not overlap with the optical axis of back lens barrel group 3, and both are on the same plane and certain angle, and its intersection point is positioned on the plane mirror (1C).
Adopt the corner type turning rear-projection object lens of technical solutions of the utility model, its advantage is: picture image is sharp keen clear, and brightness uniformity is good, and the distortion of picture and image aberration are also minimum.In addition, both help ray machine and put, can reduce back projection TV thickness again, realized slimming, be the trend of developing at present.
Description of drawings
Fig. 1 is the structural representation of the utility model corner type turning rear-projection object lens
Fig. 2 is the optical system synoptic diagram of the utility model corner type turning rear-projection object lens
Fig. 3 is the MTF curve map of the utility model corner type turning rear-projection object lens
Fig. 4 is the relative exposure curve map of the utility model corner type turning rear-projection object lens
Fig. 5 is the distortion curve figure of the utility model corner type turning rear-projection object lens
Fig. 6 is the chromatic longitudiinal aberration curve map of the utility model corner type turning rear-projection object lens
Among the figure: 1. lens barrel group before, 2. smooth hurdle, 3. back lens barrel group is 4. regulated tube, 5. ring flange, 6. mirror base; 1A. month recessed glass spherical lens, the 1B. month recessed single face aspherical plastic lens, the 1C. plane mirror; 2A. the glass spherical lens, 2B. glass spherical lens, 2C. glass spherical lens, 2D. glass spherical lens, 2E. glass spherical lens, 2F. glass sphere biconvex lens, 2G. glass spherical lens, 2H. glass spherical lens, 2I. glass sphere biconvex lens.
Embodiment
Embodiment 1: as shown in Figure 1, these object lens contain seven its both sides all with lens or lens combination and a catoptron of air adjacency, lens barrel group 1, light hurdle 2, back lens barrel group 3 before comprising, regulate tube 4, ring flange 5 and mirror unit 6.Wherein mirror unit 6 is loaded on the preceding lens barrel group 1, with screw retention; Regulate tube 4 and ring flange 5 and be loaded on the back lens barrel group 3, connect screw retention with screw thread or chute.Preceding lens barrel group 1 is equipped with eyeglass 1A, 1B and plane mirror 1C successively, and eyeglass 1A is a month recessed glass spheric glass, and eyeglass 1B is a month recessed single face aspheric surface glass lens, adopts aspheric surface PMMA plastics to make.Back lens barrel group 3 is equipped with eyeglass 2A, 2B, 2C, 2D, 2E, 2F, 2G, 2H and 2I successively, is the glass spheric glass, adopts N-PK52 or FCD1 Extra-low Dispersion optical glass to make.Wherein eyeglass 2A, 2B, 2C are three balsaming lenss, and focal power is for negative; Eyeglass 2D, 2E are cemented doublet, and focal power is for negative; Eyeglass 2F is a biconvex lens, and focal power is for just; Eyeglass 2G, 2H are cemented doublet, and focal power is for negative; Eyeglass 2I is the biconvex eyeglass, and focal power is for just.Before light hurdle 2 was positioned at eyeglass 2A, the Guang Lan aperture was 12mm.The optical axis of preceding lens barrel group becomes 90 ° of angles with the optical axis of back lens barrel group, and system is by plane mirror 1C turnover light path.Parameter about each eyeglass is listed in the table 1.
The parameter value of each lens of table 1
| Face number number | Radius (mm) | (mm) at interval | Refractive index | Abbe number | Logical light half bore (mm) |
| 1 | 38.3957 | 4.03 | 1.7174 | 29.5 | 32.6 |
| 2 | 23.8408 | 18.89 | 25.3 | ||
| 3 | 31.7570 | 3.00 | 1.4918 | 57.4 | 22.2 |
| *4 | 11.1823 | 40.21 | 17 | ||
| 5 | ∞ | -20 | MIRROR | 19.6 | |
| 5 | 134.6134 | -1.5 | 1.7725 | 49.6 | 6 |
| 6 | 11.7102 | -7.46 | 1.7174 | 29.5 | 6.6 |
| 7 | -12.4111 | -1.5 | 1.7725 | 49.6 | 7.2 |
| 8 | -265.4407 | -5.52 | 8 | ||
| 9 | -1176.6394 | -3.12 | 1.7495 | 35.0 | 10 |
| 10 | 25.3073 | -4.45 | 1.6989 | 30.2 | 11.1 |
| 11 | 62.8402 | -0.1 | 11.8 | ||
| 12 | 36.2245 | -11.06 | 1.4970 | 81.6 | 12.6 |
| 13 | -27.4328 | -0.1 | 13.7 | ||
| 14 | -192.0871 | -1.49 | 1.8052 | 25.4 | 13.8 |
| 15 | 22.8599 | -9.28 | 1.4970 | 81.6 | 14.2 |
| 16 | -46.4284 | -0.1 | 14.8 | ||
| 17 | 33.3759 | -6.75 | 1.4970 | 81.6 | 16.3 |
| 18 | -86.9328 | -40.95 | 16.3 | ||
| 19 | ∞ | 8.9 |
Annotate: face * 4 is an even exponential aspheric surface, and radius refers to its base radius
* 4 surface number D E F G
-4.9284931e-006 -6.43881e-008 1.7587802e-10 -7.2594157e-013
D, E, F, G represent biquadratic in the aspheric surface equation, six powers, eight power, ten power coefficients respectively.
The object lens performance characteristic: focal length is 9.02mm, and rear cut-off distance is 40.95mm, and relative aperture is 2.75, and conjugate distance is 785mm, and field angle is 89 °.The object lens analytical characteristic is with reference to table 2.
Table 2 object lens feature
| D 01 | BFL | f′ Before | f′ After | f′ Always | |f′ Before|/|f′ After| | |f′ Before|/|f′ Always| | D 01/|f′ Always| | BFL/f′ Always |
| 32.6 | 40.95 | -23.643 | 32.646 | 9.02 | 0.724 | 2.621 | 3.614 | 4.54 |
The corner type turning rear-projection object lens of technical solutions of the utility model, its optical property index is very good.Optical transfer function MTF shown in Figure 3 shows: 0 visual field mtf value＞0.7 (40lp/mm), 1 visual field mtf value＞0.48 (40lp/mm) shows that picture image is sharp keen clear.Fig. 4 is relative exposure (relative illumination) curve, and this visual field, curve display edge relative exposure shows that more than 95 picture brightness uniformity is fine.Fig. 5 is a distortion curve, and maximum distortion in this curve display field range＜0.5 shows that the picture distortion is minimum.Fig. 6 is chromatic curve figure, and this curve map shows that the pattern colour difference is minimum.
Embodiment 2: identical among object lens performance characteristic parameter and structure and the embodiment 1, just before the optical axis of lens barrel group become 64 ° of angles with the back optical axis of lens barrel group, as shown in Figure 2.
Claims (4)
1. corner type turning rear-projection object lens, comprise the lens both sides all with the preceding lens barrel group (1) of air adjacency, light hurdle (2), back lens barrel group (3) is regulated tube (4), ring flange (5); Before lens barrel group (1) lens (1A) and (1B) are housed successively, lens (1A) be a recessed glass spherical lens of the moon, lens (1B) are a recessed single face aspherical plastic lens of the moon; Back lens barrel group (3) is equipped with lens (2A), (2B), (2C), (2D), (2E), (2F), (2G), (2H) and (2I) successively, the lens that back lens barrel group (3) is adorned are the glass spherical lens, wherein lens (2A), (2B), (2C) are three balsaming lenss, and focal power is for negative; Lens (2D), (2E) are cemented doublet, and focal power is for negative; Lens (2F) are biconvex lens, and focal power is for just; Lens (2G), (2H) are cemented doublet, and focal power is for negative; Lens (2I) are biconvex lens, and focal power is for just; It is preceding that light hurdle (2) is positioned at lens (2A); It is characterized in that: also comprise mirror base (6) and plane mirror (1C), mirror base (6) is arranged on the preceding lens barrel group (1); Plane mirror (1C) is installed on the mirror base (6); The optical axis of preceding lens barrel group (1) does not overlap with the optical axis of back lens barrel group (3), and both are on the same plane and certain angle is arranged, and its intersection point is positioned on the plane mirror (1C).
2. corner type turning rear-projection object lens according to claim 1 is characterized in that: the optical axis of preceding lens barrel group (1) is 64 °～90 ° with the optical axis included angle of back lens barrel group (3).
3. corner type turning rear-projection object lens according to claim 1 and 2 is characterized in that: by lens (1A) with the absolute value of the focal length of the preceding lens barrel group (1) that (1B) constitutes | f
Before' |, the absolute value of the total focal length of corner type turning rear-projection object lens | f
Always' |, and by the absolute value of the focal length of lens (2A), (2B), (2C), (2D), (2E), (2F), (2G), (2H) and the back lens barrel group (3) that (2I) constitutes | f
After' | between satisfy following relation:
2.5＜f
Before'/f
Always'＜3.1
0.7＜f
Before'/f
After'＜0.9
Aerial light path d between preceding lens barrel group (1) and the back lens barrel group (3)
1B, 2AVariation range is:
60mm＜d
1B，2A＜80mm
The effectively logical optical path D of lens (1A)
01Absolute value with the total focal length of corner type turning rear-projection object lens | f
Always' | between satisfy relation:
1/2* (D
01/ | f
Always' |)＜3.9
The absolute value of aerial rear cut-off distance BFL of corner type turning rear-projection object lens and the total focal length of corner type turning rear-projection object lens | f
Always' | between satisfy relation:
BFL|f
Always' |＞4
Between from image planes to the projection screen, aerial light path TTL variation range is:
900mm＜TTL＜1200mm
4. corner type turning rear-projection object lens according to claim 1 and 2 is characterized in that: the lens in the back lens barrel group (3) adopt N-PK52 or FCD1 Extra-low Dispersion optical glass to make.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420088552 CN2735365Y (en) | 2004-09-24 | 2004-09-24 | Rotation angle type rear-projection object lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420088552 CN2735365Y (en) | 2004-09-24 | 2004-09-24 | Rotation angle type rear-projection object lens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2735365Y true CN2735365Y (en) | 2005-10-19 |
Family
ID=35265239
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420088552 Expired - Lifetime CN2735365Y (en) | 2004-09-24 | 2004-09-24 | Rotation angle type rear-projection object lens |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2735365Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108181700A (en) * | 2018-02-09 | 2018-06-19 | 深圳市帅映科技股份有限公司 | A kind of short-focus lens of optical projection system |
| CN110161663A (en) * | 2019-04-22 | 2019-08-23 | 中国科学院西安光学精密机械研究所 | A kind of refrigeration mode is without the infrared fish eye optical systems of thermalization |
-
2004
- 2004-09-24 CN CN 200420088552 patent/CN2735365Y/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108181700A (en) * | 2018-02-09 | 2018-06-19 | 深圳市帅映科技股份有限公司 | A kind of short-focus lens of optical projection system |
| CN110161663A (en) * | 2019-04-22 | 2019-08-23 | 中国科学院西安光学精密机械研究所 | A kind of refrigeration mode is without the infrared fish eye optical systems of thermalization |
| CN110161663B (en) * | 2019-04-22 | 2020-04-03 | 中国科学院西安光学精密机械研究所 | Refrigeration type athermal infrared fisheye optical system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20140924 Granted publication date: 20051019 |