CN2857048Y - Zoom lens - Google Patents
Zoom lens Download PDFInfo
- Publication number
- CN2857048Y CN2857048Y CN200520112840.3U CN200520112840U CN2857048Y CN 2857048 Y CN2857048 Y CN 2857048Y CN 200520112840 U CN200520112840 U CN 200520112840U CN 2857048 Y CN2857048 Y CN 2857048Y
- Authority
- CN
- China
- Prior art keywords
- lens
- lens group
- zoom
- compound
- group
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Lenses (AREA)
Abstract
A zoom lens is adapted to project the image generated by the display module t the screen, which comprises a first lens group and a second lens group arranged between the first lens group and the display module. The first lens group comprises a first lens, a second lens, and an aspheric lens which are arranged in sequence, wherein the aspheric lens is adjacent to the second lens group. The second lens group comprises a third lens, a fourth lens, a first compound lens, and a second compound lens which are arranged in sequence, wherein the second compound lens is adjacent to the display module. The optical focal power value of the first lens, the second lens, the aspheric lens, the third lens, the fourth lens, the first compound lens, and the second compound lens are respectively negative value, positive value, negative value, positive value, negative value, positive value, and positive value, and the first compound lens and the second compound lens are respectively composed of two lenses.
Description
Technical field
The utility model relates to a kind of zoom lens, relates in particular to the zoom lens of a kind of low cost and wide-angle.
Background technology
In recent years, (Cathode Ray Tube, CRT) projection arrangement are handled by liquid crystal projection apparatus and digital light gradually that (Digital LightProcessing, DLP) product such as projection arrangement replaces to bulky and heavy cathode-ray tube (CRT).These products except having frivolous and portable high characteristic, also can be directly and digital product link, image projecting is shown, so popularity rate improves gradually.Therefore, each tame manufacturer all constantly manages to reduce production costs lowering the price of product, and then improves the competitiveness of product.
General projection arrangement produces image by light engine, again by zoom lens with image projecting on screen, so the cost and the optical quality of the picture quality that the cost of projection arrangement and institute's projection thereof go out and light engine and zoom lens are closely bound up.
Figure 1A shows the known structural representation of a kind of zoom lens under different zoom ratios respectively with Figure 1B.Known zoom lens 100 is made up of 110,120,130 of three lens groups.And these three lens groups 110,120,130 are made up of 112,2 lens 122 of 4 lens and 4 lens 132 respectively, with the zoom lens 100 that constitutes 10 lens, and the assembling of lens is the modes that adopt artificial assembling, so many a slices lens not only can increase the cost of lens itself, also need increase the time of mechanism's part and artificial assembling, so known zoom lens 100 is made up of 10 lens, production cost is still higher.
Hold above-mentioned, when the multiplying power of zoom lens 100 becomes wide-angle side (wide-end) (shown in Figure 1B) by telescope end (tele-end) (shown in Figure 1A), when perhaps becoming telescope end by wide-angle side, these three lens groups 110,120,130 must move simultaneously, to reach the effect that multiplying power is amplified or dwindled.Hence one can see that, and the mechanism of this zoom lens 100 must be designed to make three lens groups 110,120,130 device of interlock simultaneously, so mechanism is complicated, also therefore increased production cost.
In addition, known zoom lens 100 must could projection go out 60 o'clock picture under 2.4 meters projector distance.Therefore, when the user uses zoom lens 100 in narrow space, can't obtain bigger projected picture.
The utility model content
A purpose of the present utility model just provides a kind of zoom lens, and it can projection go out big picture under short projector distance.
Another purpose of the present utility model just provides a kind of zoom lens, to avoid the problem of aberration and imaging surface skew.
Another purpose of the present utility model just provides a kind of zoom lens, to eliminate the lateral chromatic aberration phenomenon.
A purpose more of the present utility model provides a kind of zoom lens, and it can form with low-cost production under the prerequisite that does not influence projection quality.
The utility model proposes a kind of zoom lens, its image projecting that is suitable for display module is produced is to screen, and this zoom lens is made of first lens group and second lens group.Wherein, the optics focal power value of first lens group is a negative value.Specifically, this first lens group comprises a non-spherical lens.In addition, second lens group is configured between first lens group and the display module, and the optics focal power value of second lens group be on the occasion of.
Above-mentioned non-spherical lens is positioned at a side of contiguous display module, and first lens group also comprises first lens and second lens except non-spherical lens.Wherein, the optics focal power value of first lens is a negative value, and second lens are between first lens and non-spherical lens, and the optics focal power value of second lens be on the occasion of.
The surface of above-mentioned first lens, second lens and non-spherical lens has a center of curvature respectively, and each center of curvature lays respectively at the same side on its pairing surface.
Second lens group of above-mentioned zoom lens comprises the 3rd lens, the 4th lens, first compound lens and second compound lens of arranging in regular turn.Wherein, second compound lens is adjacent to a side of display module, and the optics focal power value of the 3rd lens, the 4th lens, first compound lens and second compound lens be in regular turn on the occasion of, negative value, on the occasion of with on the occasion of.
Second lens group of above-mentioned zoom lens has negative optical diopter ψ 1, and second lens group has positive optical diopter ψ 2, and 1.3≤| ψ 1/ ψ 2|≤1.6.
Above-mentioned first lens group and this second lens group be suitable for along one axially towards mutually away from or mutually approaching direction move.Wherein, when first lens group and second lens group along this axially towards mutually away from direction when moving, the effective focal length of this zoom lens is EFL, back focal length length is BFL, and EFL/BFL＜0.5.
The utility model proposes a kind of zoom lens, its image projecting that is suitable for display module is produced is to screen, and this zoom lens is made of first lens group and second lens group.Wherein, first lens group is made up of N1 lens, and specifically, comprises a non-spherical lens in these lens.In addition, first lens group has negative optical diopter ψ 1.Second lens group is configured between first lens group and the display module, and it is made up of N2 lens.Wherein, second lens group has positive optical diopter ψ 2.At this, 1.3≤| ψ 1/ ψ 2|≤1.6, and N1+N2=9, and | N1/N2|≤2.
In preferred embodiment of the present utility model, the surface of forming the lens of above-mentioned first lens group has a center of curvature respectively, and each center of curvature lays respectively at the same side on its pairing surface.
Above-mentioned first lens group and this second lens group be suitable for along one axially towards mutually away from or mutually approaching direction move.Wherein, when first lens group and second lens group along this axially towards mutually away from direction when moving, the effective focal length of this zoom lens is EFL, back focal length length is BFL, and EFL/BFL＜0.5.
Two lens in above-mentioned second lens group are formed first compound lens, and two lens are then formed second compound lens in addition.And first compound lens is adjacent with second compound lens, and second compound lens is between first compound lens and display module.
For above-mentioned and other purpose, feature and advantage of the present utility model can be become apparent, preferred embodiment cited below particularly, and cooperate appended graphicly, be described in detail below.
Description of drawings
Figure 1A shows the known structural representation of a kind of zoom lens under different zoom ratios respectively with Figure 1B;
Fig. 2 A shows respectively according to the structural representation of the described a kind of zoom lens of preferred embodiment of the utility model under different zoom ratios with Fig. 2 B;
Fig. 3 A and Fig. 3 B show the discrimination power of the image that zoom lens goes out in telescope end and the projection of wide-angle side institute and the graph of a relation of demand pairs respectively;
Fig. 4 A and Fig. 4 B show the curvature of field of the image that zoom lens goes out in telescope end and the projection of wide-angle side institute and the curve map of distortion respectively;
Fig. 5 A and Fig. 5 B show the transverse light rays sector diagram of the image that zoom lens goes out in telescope end and the projection of wide-angle side institute respectively;
Fig. 6 shows the imaging synoptic diagram of image.
Embodiment
Fig. 2 A and Fig. 2 B show the structural representation according to a described a kind of zoom lens of preferred embodiment of the utility model.The image projecting that the zoom lens 200 of present embodiment is suitable for display module 50 is produced is on the screen (not shown).This zoom lens 200 comprises first lens group 210 and second lens group 220, and wherein second lens group 220 is disposed between first lens group 210 and the display module 50.In the present embodiment, first lens group 210 for example is made up of first lens 212, second lens 214 and the non-spherical lens 216 arranged in regular turn, contiguous second lens groups 220 of non-spherical lens 216 wherein, and the optics focal power value of first lens 212, second lens 214 and non-spherical lens 216 for example be in regular turn negative value, on the occasion of with negative value.
The setting of non-spherical lens 216 can suppress the aberration phenomenon that the wide-angle incident light is produced, and then improves the optical quality of zoom lens 200.In addition, its surface of all lens all has a center of curvature in first lens group 210, and each center of curvature is positioned at the same side on its pairing surface.In other words, when supposing that the center of curvature is positioned at the curved surface right side, with the radius-of-curvature of this curved surface be defined as on the occasion of, then the radius-of-curvature of surperficial S5, the S6 of surperficial S3, the S4 of surperficial S1, the S2 of first lens 212 and second lens 214 and non-spherical lens 216 be on the occasion of.
Please continue with reference to Fig. 2 A and Fig. 2 B, second lens group 220 for example is made up of the 3rd lens 222, the 4th lens 224, first compound lens 226 and second compound lens 228 arranged in regular turn, and wherein second compound lens 228 is adjacent to a side of display module 50.The lateral chromatic aberration that first compound lens 226 and second compound lens 228 are produced when being suitable for eliminating high angle scattered light incident, and first compound lens 226 for example is made up of 223,225 on two lens, and 228 of second compound lenses for example are made up of 227,229 on two lens.At this, the optics focal power value of the 3rd lens 222, the 4th lens 224, first compound lens 226 and second compound lens 228 for example be in regular turn on the occasion of, negative value, on the occasion of with on the occasion of.
It should be noted that in Fig. 2 A and Fig. 2 B display module 50 the place aheads for example dispose protection eyeglass 60.
In the above-mentioned zoom lens 200, first lens group 210 and second lens group 220 for example be suitable for along X-axis towards away from or move near each other direction, to change the multiplying power of this zoom lens 200.Furthermore, when multiplying power faded to maximum by minimum, zoom lens 200 can become wide-angle side (shown in Fig. 2 B) by telescope end (shown in Fig. 2 A).In other words, first lens group 210 and second lens group 220 can move towards direction away from each other.At this moment, the effective focal length of zoom lens 200 is EFL, and back focal length length then is BFL.And the zoom lens 200 of present embodiment satisfies EFL/BFL＜0.5, and has the characteristic of wide-angle.In other words, even shorten projector distance, zoom lens 200 still can be kept the picture dimension that its projection goes out.For instance, the zoom lens 200 of present embodiment just can projection go out 60 o'clock picture under 1.6 meters projector distance.
Otherwise when multiplying power is faded to hour by maximum, zoom lens 200 can become telescope end by wide-angle side.That is to say that first lens group 210 and second lens group 220 move towards approaching direction each other.
In the zoom lens 200 of present embodiment, also can by first lens group 210 along X-axis towards away from or move near the direction of display module 50, to be adjusted to the image position, make zoom lens 200 projections go out image clearly.In other words, first lens group 210 also has the function of imaging compensating except the function with zoom, so can avoid the problem of aberration and imaging surface skew under different projector distances.
In the utility model one preferred embodiment, first lens group 210 for example has negative optical diopter ψ 1, and second lens group 220 for example has positive optical diopter ψ 2.Wherein, the relation of negative optical diopter ψ 1 and positive optical diopter ψ 2 for example be meet 1.3≤| the condition of ψ 1/ ψ 2|≤1.6, can improve the optical quality of zoom lens 200.When | the numerical value of ψ 1/ ψ 2| is provided with when inappropriate, under the condition of identical change multiple proportions (zoom ratio), second lens group, 220 required displacements must increase, at this moment, if do not increase the volume of zoom lens 200, then the variable power of zoom lens 200 can diminish.Otherwise, if do not influence variable power, then the volume of zoom lens 200 must increase, and promptly can't meet the demand of small size thus.Second lens group 220 on the other hand, may cause the accumulation aberration of first lens group 210 excessive, so that can't be eliminated the accumulation aberration fully.
In the present embodiment, zoom lens 200 for example is made up of 9 lens.And the lens number N1 of first lens group 210 equals 3, and the lens number N2 of second lens group 220 equals 6.In other words, the lens numbers of present embodiment meets N1+N2=9, and | the condition of N1/N2|≤2.
Following content will be enumerated a preferred embodiment of zoom lens 200, and the long optical diopter with its lens group of the focal length of this zoom lens 200 all meets 1.3≤| the condition of ψ 1/ ψ 2|≤1.6 and EFL/BFL＜0.5.Yet, listed data information is not in order to limit the utility model in following table one and the table two, those skilled in the art should do suitable change to its parameter or setting after reference the utility model, just it must belong in the category of the present utility model.
Table one
Table two
| k | α2 | α3 | α4 | α5 | |
| S5 | 3.846 | 7.4567E-6 | -1.5065E-8 | -8.157E-11 | 1.239E-13 |
| S6 | -0.407 | 5.240E-6 | -1.362E-8 | -4.786E-10 | 5.241E-13 |
Table three
In Table 1, S1, S2 are two surfaces of first lens 212 on the surface, S3, S4 are two surfaces of second lens 214 on the surface, S5, S6 are two surfaces of non-spherical lens 216 on the surface, surface S7, S8 are two surfaces of the 3rd lens 222, and surperficial S9, S10 are two surfaces of the 4th lens 224.What pay special attention to is, surperficial S11 is a virtual surface, and it mainly is the optical gate in order to the control incident light quantity.Surface S12 is the surfaces of lens 223 away from display module 50; surface S13 then is the surface that lens 223 link to each other with lens 225; surface S14 is the surface of lens 225 contiguous display modules 50; S15 is the surfaces of lens 227 away from display module 50; surface S16 is the surface that lens 227 link to each other with lens 229; surface S17 is the surface of lens 229 contiguous display modules 50, and surperficial S18, S19 are two surfaces of protection eyeglass 60, and surperficial S20 is a surface of display module 50.In addition,, please refer to table one, will no longer repeat at this relevant for each surperficial radius-of-curvature, thickness, refractive index and dispersion values.
Specifically, surperficial S6 and surperficial S17 all can have different one-tenth-value thickness 1/10s respectively when wide-angle side, centre position or telescope end, and table two is promptly listed among the embodiment surperficial S6 and surperficial S17 at the one-tenth-value thickness 1/10 of wide-angle side and telescope end.
In addition, table three item is to list in the preferred embodiment, the parameter of two surperficial S5, S6 of non-spherical lens 216, and surperficial S5, S6 meet the definition of following formula:
Wherein
R: apart from the horizontal range of the main shaft of non-spherical lens 216
Z: the y direction vertical range of corresponding r
C: the curvature on non-spherical lens 216 summits
K: the constant of the cone
Fig. 3 A and Fig. 3 B show the discrimination power of the image that zoom lens goes out in telescope end and the projection of wide-angle side institute and the graph of a relation of demand pairs respectively.With general resolution is that 800 * 600 image is an example, its displayable black and white line logarithm (line pair) in 1 mm distance is about 37, and when demand pairs were 37, its discrimination power needed to belong in the specification of standard greater than 0.5 side, or is accepted by general user.Please be simultaneously with reference to Fig. 3 A and Fig. 3 B, in preferred embodiment of the utility model, no matter zoom lens 200 is at telescope end or in wide-angle side, the discrimination power of the image that its projection goes out, demand pairs be 37 o'clock still more than 0.5.
Fig. 4 A and Fig. 4 B show the curvature of field of the image that zoom lens goes out in telescope end and the projection of wide-angle side institute and the curve map of distortion respectively.Please be simultaneously with reference to Fig. 4 A and Fig. 4 B, in preferred embodiment of the utility model, no matter zoom lens 200 is at telescope end or at the numerical value of the curvature of field (field curvature) of the image that the projection of wide-angle side institute goes out and distortion (distortion) all in the scope in standard.
Fig. 5 A and Fig. 5 B show the transverse light rays sector diagram of the image that zoom lens goes out in telescope end and the projection of wide-angle side institute respectively, and Fig. 6 shows the imaging synoptic diagram of image.Please be simultaneously with reference to Fig. 5 A, Fig. 5 B and Fig. 6, at figure (a) and (b), (c), (d), (e), (f) shown in Fig. 5 A and Fig. 5 B, be respectively at the measured transverse light rays sector diagram of some a, b, c, d, e, the f of image 80 (transverse ray fan plot).By Fig. 5 A and Fig. 5 B as can be known, no matter zoom lens 200 is telescope end or the image that goes out in the projection of wide-angle side institute, at the figure of the measured transverse light rays sector diagram of an a, b, c, d, e, f all in the scope in standard.
Therefore, by the shown various figures that go out among Fig. 3 A, Fig. 3 B, Fig. 4 A, Fig. 4 B, Fig. 5 A and Fig. 5 B as can be known, zoom lens 200 of the present utility model has the good optical quality, thereby can project the good image of quality.
In sum, zoom lens of the present utility model has routine advantage down at least:
1. less than 0.5, therefore zoom lens of the present utility model has the characteristic of wide-angle to zoom lens of the present utility model, and can provide large-sized projected picture under short projector distance at the ratio of the effective focal length of wide-angle side and back focal length length.
2. zoom lens of the present utility model only adopts nine lens, therefore not only can save the cost of lens itself, can also reduce the time of artificial assembling lens.
3. zoom lens of the present utility model is combined by two lens groups, on mechanism design, only need make two lens groups interlock simultaneously, so mechanism is comparatively simple.And because lens numbers reduces, mechanism's part also and then reduces, so can save the cost of mechanism.
4. in zoom lens of the present utility model, first lens group has the function of image revisal concurrently, therefore can avoid the problem of aberration and imaging surface skew.
5. zoom lens of the present utility model uses a slice non-spherical lens in first lens group, therefore can suppress to spend the big serious off-axis aberration phenomenon that causes because of angle of incidence of light.
6. zoom lens of the present utility model uses two compound lenses, the lateral chromatic aberration that is produced when being suitable for eliminating high angle scattered light incident in second lens group.
Though the utility model as above discloses with preferred embodiment; right its is not in order to limit the utility model; the any technician in this area; under the situation that does not break away from spirit and scope of the present utility model; therefore should do a little change and retouching, protection domain of the present utility model should be looked additional defining of claims and is as the criterion.
Claims (12)
1. zoom lens, the image projecting that is suitable for display module is produced is characterized in that on screen described zoom lens comprises:
First lens group, the optics focal power value of described first lens group is a negative value, and described first lens group comprises a non-spherical lens; And
Second lens group, described second lens group is disposed between described first lens group and the described display module, and the optics focal power value of described second lens group be on the occasion of.
2. zoom lens according to claim 1 is characterized in that, described non-spherical lens is positioned at a side of contiguous described display module, and described first lens group also comprises:
First lens, the optics focal power value of described first lens is a negative value; And
Second lens, described second lens between described first lens and described non-spherical lens, and the optics focal power value of described second lens be on the occasion of.
3. zoom lens according to claim 1 is characterized in that, the surface of described first lens, described second lens and described non-spherical lens has a center of curvature respectively, and each described center of curvature is positioned at the same side on its pairing surface.
4. zoom lens according to claim 1, it is characterized in that, described second lens group comprises the 3rd lens, the 4th lens, first compound lens and second compound lens of arranging in regular turn, and a side of the contiguous described display module of described second compound lens, and the optics focal power value of described the 3rd lens, described the 4th lens, described first compound lens and described second compound lens be in regular turn on the occasion of, negative value, on the occasion of with on the occasion of.
5. zoom lens according to claim 1, it is characterized in that, described first lens group has negative optical diopter φ 1, and described second lens group has positive optical diopter φ 2, and the pass of described negative optical diopter φ 1 and described positive optical diopter φ 2 is 1.3≤| φ 1/ φ 2|≤1.6.
6. zoom lens according to claim 1 is characterized in that, described first lens group and described second lens group be suitable for along one axially towards mutually away from or mutually approaching direction move.
7. zoom lens according to claim 6, it is characterized in that, when described first lens group and described second lens group along described axially towards mutually away from direction when moving, the effective focal length of described zoom lens is EFL, and the back focal length length of described zoom lens is BFL, and EFL/BFL＜0.5.
8. zoom lens, the image projecting that is suitable for display module is produced is characterized in that on screen described zoom lens comprises:
First lens group, described first lens group comprises N1 lens, and these lens comprise a non-spherical lens, and described first lens group has negative optical diopter φ 1; And
Second lens group, described second lens group are disposed between described first lens group and the described display module, and described second lens group comprises N2 lens, and described second lens group has positive optical diopter φ 2, wherein 1.3≤| φ 1/ φ 2|≤1.6, and N1+N2=9, and | N1/N2|≤2.
9. zoom lens according to claim 8 is characterized in that, the surface of these lens of described first lens group has a center of curvature respectively, and each described center of curvature is positioned at the same side on its pairing surface.
10. zoom lens according to claim 8 is characterized in that, described first lens group and described second lens group be suitable for along one axially towards mutually away from or mutually approaching direction move.
11. zoom lens according to claim 10, it is characterized in that, when described first lens group and described second lens group along described axially towards mutually away from direction when moving, the effective focal length of described zoom lens is EFL, and the back focal length length of described zoom lens is BFL, and EFL/BFL＜0.5.
12. zoom lens according to claim 10, it is characterized in that, form first compound lens for two in these lens of described second lens group, in these lens of described second lens group in addition two then form second compound lens, described first compound lens is adjacent with described second compound lens, and described second compound lens is between described first compound lens and described display module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200520112840.3U CN2857048Y (en) | 2005-08-01 | 2005-08-01 | Zoom lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200520112840.3U CN2857048Y (en) | 2005-08-01 | 2005-08-01 | Zoom lens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2857048Y true CN2857048Y (en) | 2007-01-10 |
Family
ID=37600352
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200520112840.3U Expired - Fee Related CN2857048Y (en) | 2005-08-01 | 2005-08-01 | Zoom lens |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2857048Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI480620B (en) * | 2010-11-09 | 2015-04-11 | Asia Optical Co Inc | Zoom projection lens |
| CN107783265A (en) * | 2016-08-29 | 2018-03-09 | 扬明光学股份有限公司 | Optical lens |
-
2005
- 2005-08-01 CN CN200520112840.3U patent/CN2857048Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI480620B (en) * | 2010-11-09 | 2015-04-11 | Asia Optical Co Inc | Zoom projection lens |
| CN107783265A (en) * | 2016-08-29 | 2018-03-09 | 扬明光学股份有限公司 | Optical lens |
| CN107783265B (en) * | 2016-08-29 | 2024-06-11 | 扬明光学股份有限公司 | Optical lens |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1661417A (en) | Retrofocus type projection optical system | |
| CN109581630B (en) | Machine vision camera lens is swept to big light ring low distortion prime line | |
| CN1928609A (en) | Combined lens system | |
| CN101114046A (en) | Focus-fixed lens | |
| CN1924630A (en) | Zoom lens optical system | |
| CN101046544A (en) | Imaging lens unit | |
| JP2014041388A (en) | Imaging lens | |
| CN113341538A (en) | High-resolution optical system suitable for different object distances and FA lens | |
| CN1550818A (en) | Projection zoom lens and optical projector with same | |
| CN1892277A (en) | Zooming-projection camera lens | |
| CN101051113A (en) | Zoom lens | |
| CN1959455A (en) | Zoom lens optical system | |
| CN2857048Y (en) | Zoom lens | |
| CN111580247B (en) | Integrally-focusing high-definition micro-projection lens | |
| CN1410795A (en) | Projective lens and projector with same | |
| CN111722378A (en) | Large-image-plane high-resolution fisheye lens | |
| CN1264038C (en) | Projecting lens and optical projector with the same projecting lens | |
| CN111367054A (en) | Small high-definition optical imaging lens | |
| CN100346188C (en) | Continuous varifocus projecting lens for projector | |
| CN114114615B (en) | High-resolution floating focusing system and lens suitable for different object distances | |
| CN212321968U (en) | Large-image-plane high-resolution fisheye lens | |
| CN213690091U (en) | Wide-angle optical imaging lens | |
| CN211603695U (en) | Small high-definition optical imaging lens | |
| US7800828B2 (en) | Wide-angle lens and projection device using the same | |
| CN102890339B (en) | Zooming projection lens for protection machine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20070110 Termination date: 20090901 |