CN101833166A - Lens barrel - Google Patents

Abstract

A lens is suitable for imaging a first image plane located at a reduction side onto an enlargement side and has an optical axis. The lens comprises a lens group and a concave reflector. The lens group is arranged on the light path between the reduction side and the enlargement side, and the concave reflector is arranged on the light path between the lens group and the enlargement side. The offset of the first image plane relative to the optical axis is greater than 100%. The projection ratio of the lens is less than 0.3.

Description

Camera lens

Technical field

The present invention relates to a kind of camera lens, and be particularly related to a kind of projection lens.

Background technology

Development along with display technique, the display of a new generation is just like LCD (liquid crystaldisplay, LCD), plasma scope (plasma display panel, PDP) and projection arrangement (projection apparatus)-replace gradually traditional cathode-ray tube (CRT) (cathode ray tub, CRT).Wherein, flat-panel screens such as LCD and plasma scope are because of having thin thickness, and can occupy bigger household application market.On the other hand, projection arrangement is then because of oversize picture (for example greater than 52 cun) can be provided under lower cost, so can occupy certain market ratio.In addition, the oversize picture can be watched for many people, helps the presenting or the displaying of teaching data of carrying out, bulletin of meeting, and this is that projection arrangement can't substituted one of the main reasons.In recent years, projection arrangement also becomes one of household electrical appliances indispensable in family's theater gradually.

In projection arrangement, the image that is presented on the light valve is less and comparatively careful picture, wherein light valve for example be silica-based liquid crystal panel (liquid-crystal-on-silicon panel, LCOS panel) or digital micromirror elements (digital micro-mirror device, DMD).In order the little picture on the light valve to be projeced on the screen, use projection lens with will be from the image strip projection of light valve in screen to form big picture.In addition, in order further to go out bigger picture short apart from inner projection, the prior art that has adopts curved reflector at the front end of camera lens.

Curved reflector can be divided into convex reflecting mirror and concave mirror, and wherein the size of convex reflecting mirror is bigger usually, so can make camera lens be difficult to accomplish dustproof design.It for example is No. the 20070184368th, U.S.'s publication (TaiWan, China bulletin patent I289210 number) that the camera lens front end adopts the prior art of concave mirror, No. the 20080079915th, U.S.'s publication, No. the 7048388th, U.S.'s bulletin patent, No. the 7441908th, U.S.'s bulletin patent, No. the 20080192208th, the U.S.'s No. the 7123420th, patent of bulletin and U.S.'s publication, wherein No. the 20070184368th, U.S.'s publication, No. the 7048388th, U.S.'s bulletin patent, the U.S.'s No. the 7441908th, patent of bulletin and U.S.'s publication have disclosed between lens combination and the concave mirror for No. 20080192208 and have been formed with intermediate imagery.

Summary of the invention

The invention provides a kind of camera lens, can reach less projection ratio, can in short distance, project bigger image frame.

Other purpose of the present invention and advantage can be further understood from the disclosed technical characterictic of the present invention.

For reaching one of above-mentioned or partly or entirely purpose or other purpose, one embodiment of the invention propose a kind of camera lens, and the one first picture planar imaging that is suitable for being positioned at a reduced side is in a Zoom Side, and have an optical axis.Camera lens comprises a lens combination and a concave mirror.Lens combination is disposed on the light path between reduced side and the Zoom Side, and concave mirror is disposed on the light path between lens combination and the Zoom Side.The first picture plane with respect to the side-play amount of optical axis greater than 100%.The projection ratio of camera lens is less than 0.3.First has picture point A, picture point B, picture point C, picture point D, picture point E, picture point F, picture point G, picture point H and picture point I as the plane.First second limit, that has one first limit, relative first limit as the plane connects first limit and the 3rd limit on second limit and the 4th limit on relative the 3rd limit, and wherein the 4th limit connects first limit and second limit.Picture point A is positioned on the summit that first limit and the 3rd limit join, picture point C is positioned on the summit that first limit and the 4th limit join, picture point G is positioned on the summit that the 3rd limit and second limit join, picture point I is positioned on the summit that the 4th limit and second limit join, picture point B is on the mid point between picture point A and the picture point C, picture point D is on the mid point between picture point A and the picture point G, picture point F is on the mid point between picture point C and the picture point I, picture point H is on the mid point between picture point G and the picture point I, picture point E is on the mid point between picture point B and the picture point H, and picture point E is on the mid point between picture point D and the picture point F.One reference planes are on the mid point of distance between lens combination and the concave mirror, and reference planes are vertical with optical axis.Central ray between the marginal ray that picture point A, picture point B, picture point C, picture point D, picture point E, picture point F, picture point G, picture point H and picture point I are sent separately is suitable for intersecting with reference planes, and these central rays that picture point A, picture point B, picture point C, picture point D, picture point E, picture point F, picture point G, picture point H and picture point I are sent respectively are suitable for intersecting at reference point a, reference point b, reference point c, reference point d, reference point e, reference point f, reference point g, reference point h and reference point i with reference planes respectively.Camera lens is arranged in the defined space of a rectangular coordinate system that x axle, y axle and z axle are constituted, and optical axis overlaps with the z axle, and the x axle is parallel to the 3rd limit and the 4th limit, and the y axle is parallel to first limit and second limit, and x axle, y axle are vertical each other with the z axle.Reference point g, reference point d, reference point a, reference point h, reference point e and reference point b respectively with the y-z plane at a distance of D1, D2, D3, D4, D5 and D6, wherein 1＜D4/D1＜1.5,1＜D5/D2＜1.5, and 1＜D6/D3＜1.5.

In one embodiment of this invention, these central rays are the chief ray by camera lens.Reference point i and reference point g can relative x-z plane mirror image symmetry each other, reference point f and reference point d can relative x-z plane mirror image symmetry each other, and reference point c and reference point a can relative x-z plane mirror image symmetry each other.Picture point B, picture point E and picture point H can be positioned on the x-z plane, and reference point b, reference point e and reference point h can be positioned on the x-z plane.

In one of the present invention embodiment, lens combination comprises one first sub-lens group and one second sub-lens group.The first sub-lens assembly places on the light path between reduced side and the concave mirror, and comprise one first lens, one second lens, one the 3rd lens, one the 4th lens, one the 5th lens and one the 6th lens that are arranged in order toward the Zoom Side by reduced side, wherein the diopter of first lens, second lens, the 3rd lens, the 4th lens, the 5th lens and the 6th lens just be respectively, positive and negative, positive and negative and just.The second sub-lens assembly places on the light path between the first sub-lens group and the concave mirror, and comprise one the 7th lens, one the 8th lens, one the 9th lens and 1 the tenth lens that are arranged in order toward the Zoom Side by reduced side, wherein the diopter of the 7th lens, the 8th lens, the 9th lens and the tenth lens just is being respectively, just, is just reaching negative.

In one embodiment of this invention, the 3rd lens and the 4th lens constitute a cemented doublet, and the 5th lens and the 6th lens constitute another cemented doublet.The first sub-lens group also can comprise 1 the 11 lens, and the 11 lens configuration is on the light path between the 6th lens and the 7th lens, and the diopter of the 11 lens is being for just, and the 8th lens and the tenth lens respectively are a non-spherical lens.First lens, second lens, the 3rd lens, the 4th lens, the 5th lens and the 6th lens, the 11 lens, the 7th lens and the 9th lens for example respectively are a spherical lens.

In one embodiment of this invention, first lens are a biconvex lens, second lens are a biconvex lens, the 3rd lens are the meniscus of a convex surface towards reduced side, the 4th lens are the concave-convex lens of a convex surface towards reduced side, the 5th lens are a biconcave lens, the 6th lens are the concave-convex lens of a convex surface towards reduced side, the 11 lens are a biconvex lens, the 7th lens are a biconvex lens, the 8th lens are the concave-convex lens of a concave surface towards reduced side, and nine lens are a biconvex lens, and the tenth lens are a biconcave lens.

In one embodiment of this invention, the first sub-lens group also comprises 1 the 12 lens and 1 the 13 lens, the 12 lens configuration is on the light path between first lens and second lens, the 13 lens configuration is on the light path between the 7th lens and the 8th lens, the diopter of the 12 lens and the 13 lens be respectively negative with just, and first lens, the 8th lens and the tenth lens respectively are a non-spherical lens.The 12 lens, second lens, the 3rd lens, the 4th lens, the 5th lens and the 6th lens, the 7th lens, the 13 lens and the 9th lens for example respectively are a spherical lens.Camera lens also can comprise an aperture diaphragm, and aperture diaphragm is disposed between the 6th lens and the 7th lens.

In one embodiment of this invention, first lens are a biconvex lens, the 12 lens are a biconcave lens, second lens are a biconvex lens, the 3rd lens are a biconcave lens, the 4th lens are the concave-convex lens of a convex surface towards reduced side, the 5th lens are a biconcave lens, the 6th lens are a biconvex lens, the 7th lens are the concave-convex lens of a concave surface towards reduced side, and the 13 lens are the concave-convex lens of a concave surface towards reduced side, and the 8th lens are the concave-convex lens of a concave surface towards reduced side, the 9th lens are a biconvex lens, and the tenth lens are a biconcave lens.

Because the camera lens of the embodiment of the invention meets above-mentioned relation formula (i.e. 1＜D4/D1＜1.5,1＜D5/D2＜1.5 and 1＜D6/D3＜1.5), and has less projection ratio, therefore can in short distance, project bigger image frame, and the quality of optical imaging of image frame is good.

For the above-mentioned feature and advantage of the present invention can be become apparent, embodiment cited below particularly, and conjunction with figs. is described in detail below.

Description of drawings

Figure 1A is the structural representation of the camera lens of one embodiment of the invention;

Figure 1B is the structural representation of the lens combination in the camera lens of Figure 1A;

Fig. 2 is the synoptic diagram of the first picture plane with respect to the side-play amount of optical axis;

Fig. 3 A is the synoptic diagram on the picture of first in the camera lens of Figure 1A plane;

Fig. 3 B is the synoptic diagram of reference planes of the camera lens of Figure 1A;

Fig. 4 is the image optics emulated data figure of the camera lens of Figure 1A;

Fig. 5 A and Fig. 5 B are the synoptic diagram of the TV distortion (TV distortion) of image frame;

Fig. 6 A is the structural representation of the camera lens of another embodiment of the present invention;

Fig. 6 B is the structural representation of the lens combination in the camera lens of Fig. 6 A;

Fig. 7 is the image optics emulated data figure of the camera lens of Fig. 6 A.

[main element symbol description]

50: the first picture planes

52: image strip

60: screen

70: glass cover

80: inner full-reflection prism

100,100 ': camera lens

110: concave mirror

120: aperture diaphragm

200,200 ': lens combination

210,210 ': the first sub-lens group

211,211 ': the first lens

212: the second lens

213,213 ': the 3rd lens

213a, 213a ', 215a, 125a ': cemented doublet

214: the four lens

215: the five lens

216,216 ': the 6th lens

217: the 11 lens

218: the 12 lens

220: the second sub-lens groups

221,221 ': the 7th lens

222: the eight lens

223: the nine lens

224: the ten lens

225: the 13 lens

A～I: picture point

A～i: reference point

D1～D6, Ld, M: distance

E1: first limit

E2: second limit

E3: the 3rd limit

E4: the 4th limit

Lh: width

O: optical axis

P: reference planes

S1～S31: surface

T: central ray

W: catercorner length

Embodiment

The explanation of following each embodiment is with reference to the accompanying drawings, can be in order to the specific embodiment of implementing in order to illustration the present invention.The direction term that the present invention mentioned, for example " on ", D score, " preceding ", " back ", " left side ", " right side " etc., only be direction with reference to the accompanying drawings.Therefore, the direction term of use is to be used for explanation, but not is used for limiting the present invention.

Figure 1A is the structural representation of the camera lens of one embodiment of the invention, and Figure 1B is the structural representation of the lens combination in the camera lens of Figure 1A.With reference to Figure 1A and Figure 1B, the camera lens 100 of present embodiment is suitable for one first imaging in a Zoom Side as plane 50 with what be positioned at a reduced side.In the present embodiment, camera lens 100 can be a tight shot.In the present embodiment, first for example is the active surface of light valve as plane 50, and first image strip 52 that sends as plane 50 is suitable for being projeced on the screen 60 of Zoom Side by camera lens 100 and forms image frame.Light valve for example be digital micromirror elements (digitalmicro-mirror device, DMD).Yet in other embodiments, light valve also can be silica-based liquid crystal panel (liquid-crystal-on-silicon panel, LCOS panel) or penetration liquid crystal panel (transmissive liquid crystal panel).Camera lens 100 has an optical axis O.Camera lens 100 can be arranged in the defined space of a rectangular coordinate system that x axle, y axle and z axle are constituted, and optical axis O overlaps with the z axle, and x axle, y axle are vertical each other with the z axle.

Camera lens 100 comprises a lens combination 200 and a concave mirror 110.Lens combination 200 is disposed on the light path between reduced side and the Zoom Side, and concave mirror 110 is disposed on the light path between lens combination 200 and the Zoom Side.In the present embodiment, lens combination 200 comprises one first sub-lens group 210 and one second sub-lens group 220.The first sub-lens group 210 is disposed on the light path between reduced side and the concave mirror 110, and the first sub-lens group 210 comprises one first lens 211, one second lens 212, one the 3rd lens 213, one the 4th lens 214, one the 5th lens 215 and one the 6th lens 216 that are arranged in order to the Zoom Side by reduced side, wherein the diopter of first lens 211, second lens 212, the 3rd lens 213, the 4th lens 214, the 5th lens 215 and the 6th lens 216 just be respectively, positive and negative, positive and negative and just.The second sub-lens group 220 is disposed on the light path between the first sub-lens group 210 and the concave mirror 110, and the second sub-lens group 220 comprises one the 7th lens 221, one the 8th lens 222, one the 9th lens 223 and 1 the tenth lens 224 that are arranged in order to the Zoom Side by reduced side, and wherein the diopter of the 7th lens 221, the 8th lens 222, the 9th lens 223 and the tenth lens 224 just is being respectively, just, is just reaching negative.In the present embodiment, the first sub-lens group 210 can comprise that also 1 the 11 lens 217, the, 11 lens 217 are disposed on the light path between the 6th lens 216 and the 7th lens 221, and the diopter of the 11 lens 217 is for just.

In the present embodiment, the 3rd lens 213 and the 4th lens 214 constitute a cemented doublet 213a, and the 5th lens 215 and the 6th lens 216 another cemented doublet of formation 215a.In addition, the 8th lens 222 and the tenth lens 224 for example respectively are a non-spherical lens.Moreover first lens 211, second lens 212, the 3rd lens 213, the 4th lens 214, the 5th lens 215 and the 6th lens the 216, the 11 lens 217, the 7th lens 221 and the 9th lens 223 for example respectively are a spherical lens.Camera lens 100 also can comprise an aperture diaphragm 120, and aperture diaphragm 120 is disposed between the 11 lens 217 and the 7th lens 221.

Particularly, first lens 211 for example are a biconvex lens, second lens 212 for example are a biconvex lens, the 3rd lens 213 for example are the meniscus of a convex surface towards reduced side, the 4th lens 214 for example are the concave-convex lens of a convex surface towards reduced side, the 5th lens 215 for example are a biconcave lens, the 6th lens 216 for example are the concave-convex lens of a convex surface towards reduced side, the 11 lens 217 for example are a biconvex lens, the 7th lens 221 for example are a biconvex lens, the 8th lens 222 for example are the concave-convex lens of a concave surface towards reduced side, and the 9th lens 223 for example are a biconvex lens, and the tenth lens 224 for example are a biconcave lens.Concave mirror 110 for example is a free-form surface mirror.In this manual, free-form surface mirror is the catoptron with reflecting surface of free form surface, and wherein free form surface is the curved surface that any available mathematical expression is expressed.

Fig. 2 is the synoptic diagram of the first picture plane with respect to the side-play amount of optical axis.With reference to Figure 1A, Figure 1B and Fig. 2, in the camera lens 100 of present embodiment, the first picture plane 50 with respect to the side-play amount of optical axis O greater than 100%.First side-play amount as plane 50 may be defined as:

Wherein, Lh is the first picture width of plane 50 on the offset direction, and Ld is that the one side of close optical axis O on the first picture plane 50 is to the distance of optical axis O.When optical axis O and the first picture plane 50 are non-intersect, the value of Ld be on the occasion of.When optical axis O intersected with first edge as plane 50 just, the value of Ld was 0.When the edge of optical axis O by the first picture plane 50 with interior when regional, the value of Ld is a negative value.

The projection ratio of camera lens 100 is less than 0.3.The projection ratio of camera lens 100 is defined as M/W, wherein M be the summit of concave mirror 110 to the distance (as Figure 1A shown in) of screen 60 on the z direction, and W is the horizontal length of the image frame that goes out of 100 projections of camera lens.

Fig. 3 A is the synoptic diagram on the picture of first in the camera lens of Figure 1A plane, and Fig. 3 B is the synoptic diagram of reference planes of the camera lens of Figure 1A.With reference to Figure 1A, Figure 1B, Fig. 3 A and Fig. 3 B, first has picture point A, picture point B, picture point C, picture point D, picture point E, picture point F, picture point G, picture point H and picture point I as plane 50.In addition, the first second limit E2, that has one first limit E1, relative first a limit E1 as plane 50 connects the first limit E1 and the 3rd limit E3 of the second limit E2 and the 4th limit E4 of relative the 3rd a limit E3, and wherein the 4th limit E4 connects the first limit E1 and the second limit E2.The x axle is parallel to the 3rd limit E3 and the 4th limit E4, and the y axle is parallel to the first limit E1 and the second limit E2.Picture point A is positioned on the summit that the first limit E1 and the 3rd limit E3 join, picture point C is positioned on the summit that the first limit E1 and the 4th limit E4 join, picture point G is positioned on the summit that the 3rd limit E3 and the second limit E2 join, picture point I is positioned on the summit that the 4th limit E4 and the second limit E2 join, picture point B is on the mid point between picture point A and the picture point C, picture point D is on the mid point between picture point A and the picture point G, picture point F is on the mid point between picture point C and the picture point I, picture point H is on the mid point between picture point G and the picture point I, picture point E is on the mid point between picture point B and the picture point H, and picture point E is on the mid point between picture point D and the picture point F.One reference planes P (shown in Figure 1A and Fig. 3 B) is positioned on the mid point of lens combination 200 and the spacing of concave mirror 110, in other words, in the present embodiment, reference planes P and the tenth lens 224 equal reference planes P and the spacing of concave mirror 110 on optical axis O in the spacing on the optical axis O.In addition, reference planes P is vertical with optical axis O.Central ray (center ray) T between the marginal ray (marginalray) that picture point A, picture point B, picture point C, picture point D, picture point E, picture point F, picture point G, picture point H and picture point I are sent separately can intersect with reference planes P, and these central rays T that picture point A, picture point B, picture point C, picture point D, picture point E, picture point F, picture point G, picture point H and picture point I are sent respectively is suitable for intersecting at reference point a, reference point b, reference point c, reference point d, reference point e, reference point f, reference point g, reference point h and reference point i with reference planes respectively.

In the present embodiment, these central rays T for example is the chief ray (chiefray) by camera lens 100, and chief ray is the light by the geometric center of aperture diaphragm 120.When camera lens 100 was the heart far away (telecentric) camera lens, central ray T had been parallel to optical axis O approximately near first direct of travel as 50 places, plane.

Reference point g, reference point d, reference point a, reference point h, reference point e and reference point b respectively with the y-z plane at a distance of D1, D2, D3, D4, D5 and D6, shown in Fig. 3 B, wherein 1＜D4/D1＜1.5,1＜D5/D2＜1.5, and 1＜D6/D3＜1.5.In the present embodiment, reference point i and reference point g can relative x-z plane mirror image symmetry each other, reference point f and reference point d can relative x-z plane mirror image symmetry each other, and reference point c and reference point a can relative x-z plane mirror image symmetry each other, wherein the x-y plane is the plane that x axle and y axle are constituted, and the x-z plane is that the x axle is in the plane that the z axle is constituted.In addition, in the present embodiment, picture point B, picture point E and picture point H can be positioned on the x-z plane, and reference point b, reference point e and reference point h can be positioned on the x-z plane.

Because the camera lens 100 of present embodiment meets above-mentioned relation formula (i.e. 1＜D4/D1＜1.5,1＜D5/D2＜1.5 and 1＜D6/D3＜1.5), and has less projection than (less than 0.3), therefore can in short distance, project bigger image frame, and the quality of optical imaging of image frame is good.

Following content will be enumerated an embodiment of camera lens 100.Be noted that, listed data are not in order to limit the present invention in following table one, table two and the table three, those of ordinary skill under any in the technical field is after reference the present invention, and when doing suitable change to its parameter or setting, it must belong in the scope of the present invention.

(table)

In Table 1, spacing is meant the air line distance on optical axis between two adjacent surfaces, for instance, and the spacing of surperficial S1, the air line distance between promptly surperficial S1 and the surperficial S2 on optical axis O.Each spacing, refractive index and Abbe number value corresponding during the pairing thickness of each lens, refractive index and Abbe number please refer to and go together in the remarks column.In addition, in Table 1, surperficial S1 is the first picture plane 50.Surface S2, S3 are two surfaces of glass cover (cover glass) 70, and wherein glass cover 70 is in order to the protection light valve.S4, S5 are two surfaces of inner full-reflection prism 80 on the surface.Surface S6 and surperficial S7 are two surfaces of first lens 211, and surperficial S8 and surperficial S9 are two surfaces of second lens 212.Surface S 10 is the surface towards reduced side of the 3rd lens 213, and surperficial S11 is the surface that the 3rd lens 213 link to each other with the 4th lens 214, and surperficial S12 is the surface towards the Zoom Side of the 4th lens 214.Surface S13 is the surface towards reduced side of the 5th lens 215, and surperficial S14 is the surface that the 5th lens 215 link to each other with the 6th lens 216, and surperficial S15 is the surface towards the Zoom Side of the 6th lens 216.Surface S26 and surperficial S27 are two surfaces of the 11 lens 217.Surface S16 is the surface of aperture diaphragm 120.Surface S17 and surperficial S18 are two surfaces of the 7th lens 221, and surperficial S19 and surperficial S20 are two surfaces of the 8th lens 222.Surface S21 and surperficial S22 are two surfaces of the 9th lens 223, and surperficial S23 and surperficial S24 are two surfaces of the tenth lens 224.Surface S25 is the reflecting surface of concave mirror 110, and the distance values of that row of surperficial S25 is the distance of concave mirror 110 to image frame.

Relevant for parameter values such as each surperficial radius-of-curvature, spacings, please refer to table one, no longer repeat at this.

Above-mentioned surperficial S19, S20, S23 and S24 are even item aspheric surface, and its available following formulate:

$Z=\frac{{\mathrm{cr}}^2}{1+\sqrt{1-(1+k)c^2{r}^2}}+A_2{r}^2+A_4{r}^4+A_6{r}^6+A_8{r}^8+A_{10}{r}^{10}+A_{12}{r}^{12}$

$+...$

In the formula, Z is the side-play amount (sag) of optical axis O direction, and c is the inverse of the radius of osculating sphere (osculating sphere), just near the inverse of the radius-of-curvature at optical axis O place (as the radius-of-curvature of S19, S20, S23 and S24 in the table one).K is quadric surface coefficient (conic), and r is the aspheric surface height, be from the lens center to the height of rims of the lens, and A ₂, A ₄, A ₆, A ₈, A ₁₀, A ₁₂... be asphericity coefficient (aspheric coefficient), coefficient A in the present embodiment ₂Be 0.What table two was listed is the parameter value of surperficial S19, S20, S23 and S24.

(table two)

Above-mentioned surperficial S25 is an even item free form surface, and its available following formulate:

$Z=\frac{c(X^2+Y^2)}{1+\sqrt{1-(1+k)c^2(X^2+Y^2)}}+A_{\mathrm{2,0}}{X}^2+A_{\mathrm{0,2}}{Y}^2+A_{\mathrm{4,0}}{X}^4$

$+A_{\mathrm{2,2}}{X}^2{Y}^2+A_{\mathrm{0,4}}{Y}^4+A_{\mathrm{6,0}}{X}^6+A_{\mathrm{4,2}}{X}^4{Y}^2+A_{\mathrm{2,4}}{X}^2{Y}^4+A_{\mathrm{0,6}}{Y}^6$

$+A_{\mathrm{8,0}}{X}^8+A_{\mathrm{6,2}}{X}^6{Y}^2+A_{\mathrm{4,4}}{X}^4{Y}^4+A_{\mathrm{2,6}}{X}^2{Y}^6+A_{\mathrm{0,8}}{Y}^8+A_{\mathrm{10,0}}{X}^{10}$

$+A_{\mathrm{8,2}}{X}^8{Y}^2+A_{\mathrm{6,4}}{X}^6{Y}^4+A_{\mathrm{4,6}}{X}^4{Y}^6+A_{\mathrm{2,8}}{X}^2{Y}^8+A_{\mathrm{0,10}}{Y}^{10}$

$+A_{\mathrm{12,0}}{X}^{12}+A_{\mathrm{10,2}}{X}^{10}{Y}^2+A_{\mathrm{8,4}}{X}^8{Y}^4+A_{\mathrm{6,6}}{X}^6{Y}^6+A_{\mathrm{4,8}}{X}^4{X}^8$

$+A_{\mathrm{2,10}}{X}^2{Y}^{10}+A_{\mathrm{0,12}}{Y}^{12}+A_{\mathrm{14,0}}{X}^{14}+A_{\mathrm{12,2}}{X}^{12}{Y}^2+A_{\mathrm{10,4}}{X}^{10}{Y}^4$

$+A_{\mathrm{8,6}}{X}^8{Y}^6+A_{\mathrm{6,8}}{X}^6{Y}^8+A_{\mathrm{4,10}}{X}^4{Y}^{10}+A_{\mathrm{2,12}}{X}^2{Y}^{12}+A_{\mathrm{0,14}}{Y}^{14}$

$+A_{\mathrm{16,0}}{\mathrm{<figure-callout\; id="16"\; label="X"\; filenames="H2009102081110E0000021.png"\; state="\{\{state\}\}">X</figure-callout>}}^{16}+A_{\mathrm{14,2}}{X}^{14}{Y}^2+A_{\mathrm{12,4}}{X}^{12}{Y}^4+A_{\mathrm{10,6}}{X}^{10}{Y}^6+A_{\mathrm{8,8}}{X}^8{Y}^8$

$+A_{\mathrm{6,10}}{X}^6{Y}^{10}+A_{\mathrm{4,12}}{X}^4{Y}^{12}+A_{\mathrm{2,14}}{X}^2{Y}^{14}+A_{\mathrm{0,16}}{\mathrm{<figure-callout\; id="16"\; label="Y"\; filenames="H2009102081110E0000021.png"\; state="\{\{state\}\}">Y</figure-callout>}}^{16}+...$

In the formula, Z is the side-play amount (sag) of optical axis O direction, and c is the inverse of the radius of osculating sphere (osculating sphere), just near the inverse of the radius-of-curvature at optical axis 0 place (as the radius-of-curvature of S25 in the table one).K is quadric surface coefficient (conic), X is the height of free form surface on the x direction, is from the lens center along the height of x direction to rims of the lens, and Y is the height of free form surface on the y direction, be from the lens center along the height of y direction to rims of the lens, and A _2,0, A _0,2, A _4,0, A _2,2, A _0,4, A _6,0, A _4,2, A _2,4, A _0,6, A _8,0, A _6,2, A _4,4, A _2,6, A _0,8, A _10,0, A _8,2, A _6,4, A _4,6, A _2,8, A _0,10, A _12,0, A _10,2, A _8,4, A _6,6, A _4,8, A _2,10, A _0,12, A _14,0, A _12,2, A _10,4, A _8,6, A _6,8, A _4,10, A _2,12, A _0,14, A _16,0, A _14,2, A _12,4, A _10,6, A _8,8, A _6,10, A _4,12, A _2,14, A _0,16... be free form surface coefficient (free form coefficient), coefficient A in the present embodiment _2,0With A _0,2Be 0.What table three was listed is the parameter value of surperficial S25.

(table three)

In the camera lens 100 of present embodiment, for example be that to adopt, length breadth ratio at 0.65 o'clock be that 16: 9 and resolution are the first picture plane 50 of 1080P, the projection ratio is as being 0.15, side-play amount for example is 120%, and the size of image frame for example is 60 o'clock.In addition, in the camera lens 100 of present embodiment, distance D 1 for example is 13.39 millimeters, and distance D 2 for example is 41.74 millimeters, and distance D 3 for example is 56.38 millimeters, distance D 4 for example is 16.24 millimeters, distance D 5 for example is 51.05 millimeters, and distance D 6 for example is 68.67 millimeters, and D4/D1 for example is 1.21, D5/D2 for example is 1.22, and D6/D3 for example is 1.21.

Fig. 4 is the image optics emulated data figure of the camera lens 100 of Figure 1A.With reference to Fig. 4, Fig. 4 is the point range figure (spot diagram) that utilizes green glow (wavelength 550 nanometers) to be simulated, and this point range figure is first to be projeced into the spot size of the different visual fields on the screen 60 as points different on the plane 50.The shown figure that goes out of Fig. 4 all in the scope of standard, can verify that thus the camera lens 100 of present embodiment really can tool good optical image quality.

Fig. 5 A and Fig. 5 B are the synoptic diagram of the TV distortion (TV distortion) of image frame.With reference to Fig. 5 A, the top T V of image frame 90 distortion is defined as (L1-L3)/L3, and the bottom TV of image frame 90 distortion is defined as (L2-L3)/L3.With reference to Fig. 5 B, the vertical TV of image frame 90 distortion is defined as [(L4+L5)-2L6]/(2L6).With reference to Figure 1A and Figure 1B, the top T V distortion of the image frame that is projected via the camera lens 100 of present embodiment for example is 0.06%, and TV distortion in bottom for example is 0.1%, and vertical TV distortion for example is 0.06%.Hence one can see that, and camera lens 100 can have the good optical image quality really.

Fig. 6 A is the structural representation of the camera lens of another embodiment of the present invention, and Fig. 6 B is the structural representation of the lens combination in the camera lens of Fig. 6 A.With reference to Fig. 6 A and Fig. 6 B, the camera lens 100 ' of present embodiment is similar with above-mentioned camera lens 100 (shown in Figure 1A), and both difference is as described below.In the lens combination 200 ' of camera lens 100 ', the first sub-lens group 210 ' also comprises 1 the 12 lens 218 and 1 the 13 lens 225.The 12 lens 218 are disposed on the light path between first lens 211 ' and second lens 212, the 13 lens 225 are disposed on the light path between the 7th lens 221 ' and the 8th lens 222, and the diopter of the 12 lens 218 and the 13 lens 225 be respectively negative with just.In the present embodiment, the 12 lens 218 and the 13 lens 225 for example respectively are a spherical lens.In addition, first lens 211 ' for example are a non-spherical lens.Moreover in the present embodiment, aperture diaphragm 120 is disposed between the 6th lens 216 ' and the 7th lens 221 '.

In one embodiment of this invention, first lens 211 ' for example are a biconvex lens, the 12 lens 218 for example are a biconcave lens, and the 3rd lens 213 ' for example are a biconcave lens, and the 3rd lens 213 ' and the 4th lens 214 can constitute a cemented doublet 213a '.The 6th lens 216 ' for example are a biconvex lens, and the 5th lens 215 and the 6th lens 216 ' can constitute another cemented doublet 125a '.The 7th lens 221 ' for example are the concave-convex lens of a concave surface towards reduced side, and the 13 lens 225 are the concave-convex lens of a concave surface towards reduced side.Concave mirror 110 for example is a non-spherical reflector.The camera lens 100 ' and the above-mentioned camera lens 100 (shown in Figure 1A) of present embodiment have confers similar advantages and effect, no longer repeat at this.

Following content will be enumerated an embodiment of camera lens 100 '.Be noted that, listed data are not in order to limit the present invention in following table four and the table five, those of ordinary skill is after reference the present invention in the technical field under any, and when doing suitable change to its parameter or setting, it must belong in the scope of the present invention.

(table four)

In table four, surperficial S1～S5, S8, S9, S12, S13, S16, S19～S25 are identical with surperficial S1～S5, S8, S9, S12, S13, S16, S 19～S25 in the table one, no longer repeat at this.In addition, surperficial S6, S7 are two surfaces of first lens 211 ', and surperficial S28, S29 are two surfaces of the 12 lens 218.Surface S10 be the 3rd lens 213 ' towards the surface of reduced side, and surperficial S11 is the surface that the 3rd lens 213 ' link to each other with the 4th lens 214.Surface S14 is the surface that the 5th lens 215 link to each other with the 6th lens 216 ', and surperficial S15 is the surface towards the Zoom Side of the 6th lens 216 '.S17, S18 are two surfaces of the 7th lens 221 ' on the surface.

Above-mentioned surperficial S6, S7, S19, S20, S23, S24 and S25 are even item aspheric surface.Coefficient A in the present embodiment ₂Be 0.What table five was listed is the parameter value of surperficial S6, S7, S19, S20, S23, S24 and S25.

(table five)

In the camera lens 100 ' of present embodiment, for example be that to adopt, length breadth ratio at 0.65 o'clock be that 16: 9 and resolution are the first picture plane 50 of 1080P, the projection ratio is as being 0.25, side-play amount for example is 120%, and the size of image frame for example is 60 o'clock.In addition, in the camera lens 100 ' of present embodiment, distance D 1 for example is 12.33 millimeters, and distance D 2 for example is 39.48 millimeters, and distance D 3 for example is 57.528 millimeters, distance D 4 for example is 14.89 millimeters, distance D 5 for example is 46.46 millimeters, and distance D 6 for example is 65.73 millimeters, and D4/D1 for example is 1.2, D5/D2 for example is 1.17, and D6/D3 for example is 1.14.

Fig. 7 is the image optics emulated data figure of the camera lens 100 ' of Fig. 6 A.With reference to Fig. 7, Fig. 7 is the point range figure (spot diagram) that utilizes green glow (wavelength 550 nanometers) to be simulated, and this point range figure is first to be projeced into the spot size of the different visual fields on the screen 60 as points different on the plane 50.The shown figure that goes out of Fig. 7 all in the scope of standard, can verify that thus the camera lens 100 ' of present embodiment really can tool good optical image quality.

The top T V distortion of the image frame that is projected via the camera lens 100 of present embodiment for example is 0.16%, and TV distortion in bottom for example is 0.1%, and vertical TV distortion for example is 0.15%.Hence one can see that, and camera lens 100 ' can have the good optical image quality really.

In sum, because the camera lens of the embodiment of the invention meets above-mentioned relation formula (i.e. 1＜D4/D1＜1.5,1＜D5/D2＜1.5 and 1＜D6/D3＜1.5), and has less projection than (less than 0.3), therefore can in short distance, project bigger image frame, and the quality of optical imaging of image frame is good.

Though the present invention discloses as above with embodiment; right its is not in order to limit the present invention; those of ordinary skill in the technical field under any; do not breaking away from the spirit and scope of the invention; when making various modifications and variations, so protection scope of the present invention should be as the criterion with the scope of appended claims.Arbitrary embodiment of the present invention in addition or claim must not reached the disclosed whole purposes of the present invention or advantage or characteristics.In addition, summary part and title only are the usefulness that is used for assisting the patent document retrieval, are not to be used for limiting protection scope of the present invention.

Claims (13)

1. A lens adapted to image a first image plane positioned at a reduced side on an enlarged side and having an optical axis, said lens comprising: a lens group disposed on the light path between the reduction side and the enlargement side; and a concave reflector, arranged on the optical path between the lens group and the magnifying side, Wherein, the offset of the first image plane with respect to the optical axis is greater than 100%, the projection ratio of the lens is less than 0.3, and the first image plane has image point A, image point B, image point C, Image point D, image point E, image point F, image point G, image point H and image point I, the first image plane has a first side, a second side opposite to the first side, a connection The third side of the first side and the second side and a fourth side opposite to the third side, the fourth side connects the first side and the second side, and the image point A is located at On the vertex where the first side is connected to the third side, the image point C is located on the vertex where the first side is connected to the fourth side, and the image point G is located at the vertex where the third side is connected to the fourth side. On the vertex where the second side is connected, the image point I is located at the vertex where the fourth side is connected with the second side, and the image point B is located at the midpoint between the image point A and the image point C, and the image point D is located at the midpoint between image point A and image point G, image point F is located at the midpoint between image point C and image point I, and image point H is located at the midpoint between image point G and image point I On, the image point E is located on the midpoint between the image point B and the image point H, and the image point E is located on the midpoint between the image point D and the image point F, and a reference plane is located between the lens group and the On the midpoint of the distance between concave mirrors, and the reference plane is perpendicular to the optical axis, image point A, image point B, image point C, image point D, image point E, image point F, image point G, A central ray between the edge rays sent out by the image point H and the image point I respectively is suitable for intersecting the reference plane, image point A, image point B, image point C, image point D, image point E, image point F, these central rays emitted by image point G, image point H and image point I respectively are suitable for respectively intersecting with the reference plane at reference point a, reference point b, reference point c, reference point d, reference point e, Reference point f, reference point g, reference point h, and reference point i, the lens is located in the space defined by the rectangular coordinate system formed by the x-axis, y-axis, and z-axis, and the optical axis coincides with the z-axis, The x-axis is parallel to the third side and the fourth side, the y-axis is parallel to the first side and the second side, the x-axis, y-axis and z-axis are perpendicular to each other, the reference point g, the reference point d. Reference point a, reference point h, reference point e and reference point b are respectively D1, D2, D3, D4, D5 and D6 away from the y-z plane, among which 1<D4/D1<1.5, 1<D5/D2<1.5 , and 1<D6/D3<1.5. 2. The lens according to claim 1, wherein each of the central rays is a chief ray passing through the lens. 3. The camera lens according to claim 1, wherein the reference point i and the reference point g are mirror symmetrical to each other on the x-z plane, the reference point f and the reference point d are mirror symmetrical to each other on the x-z plane, and the reference point c and the reference point a They are mirror symmetric to each other on the x-z plane. 4. The lens according to claim 1, wherein the image point B, the image point E, and the image point H are located on the x-z plane, and the reference point b, the reference point e, and the reference point h are located on the x-z plane. 5. The lens according to claim 1, wherein said lens group comprises: A first sub-lens group, arranged on the optical path between the reduction side and the concave mirror, and including a first lens and a second lens arranged in sequence from the reduction side to the enlargement side , a third lens, a fourth lens, a fifth lens and a sixth lens, wherein the first lens, the second lens, the third lens, the fourth lens, the fifth The diopters of the lens and the sixth lens are respectively positive, positive, negative, positive, negative and positive; and A second sub-lens group, arranged on the optical path between the first sub-lens group and the concave reflector, and including a seventh lens, a An eighth lens, a ninth lens, and a tenth lens, wherein the diopters of the seventh lens, the eighth lens, the ninth lens, and the tenth lens are positive, positive, positive, and negative, respectively. 6. The lens according to claim 5, wherein the third lens and the fourth lens form a doublet lens, and the fifth lens and the sixth lens form another doublet lens. 7. The lens according to claim 5, wherein the first sub-lens group further comprises an eleventh lens, and the eleventh lens is arranged in the light between the sixth lens and the seventh lens. On the path, the diopter of the eleventh lens is positive, and each of the eighth lens and the tenth lens is an aspheric lens. 8. The lens according to claim 7, wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens, the Each of the eleventh lens, the seventh lens and the ninth lens is a spherical lens. 9. The lens according to claim 7, wherein the first lens is a biconvex lens, the second lens is a biconvex lens, the third lens is a convex-convex lens with a convex surface facing the reducing side, and the first The four lenses are a concave-convex lens with a convex surface facing the reducing side, the fifth lens is a biconcave lens, the sixth lens is a concave-convex lens with a convex surface facing the reducing side, and the eleventh lens is a biconvex lens, The seventh lens is a biconvex lens, the eighth lens is a meniscus lens with a concave surface facing the reducing side, the ninth lens is a biconvex lens, and the tenth lens is a biconcave lens. 10. The lens according to claim 5, wherein the first sub-lens group further comprises a twelfth lens and a thirteenth lens, and the twelfth lens is arranged between the first lens and the thirteenth lens On the light path between the two lenses, the thirteenth lens is arranged on the light path between the seventh lens and the eighth lens, and the diopter of the twelfth lens and the thirteenth lens are negative and positive respectively, and each of the first lens, the eighth lens and the tenth lens is an aspheric lens. 11. The lens according to claim 10, wherein the twelfth lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens, the Each of the seventh lens, the thirteenth lens and the ninth lens is a spherical lens. 12. The lens according to claim 10, further comprising an aperture stop disposed between the sixth lens and the seventh lens. 13. The lens according to claim 10, wherein the first lens is a biconvex lens, the twelfth lens is a biconcave lens, the second lens is a biconvex lens, and the third lens is a biconcave lens, so The fourth lens is a meniscus lens with a convex surface facing the reduction side, the fifth lens is a biconcave lens, the sixth lens is a biconvex lens, and the seventh lens is a meniscus lens with a concave surface facing the reduction side. , the thirteenth lens is a meniscus lens with a concave surface facing the reduction side, the eighth lens is a meniscus lens with a concave surface facing the reduction side, the ninth lens is a biconvex lens, and the tenth lens The lens is a biconcave lens.

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