TWI443408B - Zooming lens assembly - Google Patents

Description

Zoom lens assembly

The present invention relates to a zoom lens assembly, and more particularly to a zoom lens assembly that can effectively improve imaging performance.

Taking the zoom lens assembly disclosed in Japanese Laid-Open Patent Publication No. 2008-176231 as an example, the '231 case employs a single lens in the fifth lens group, and its aperture is along the light as the fifth lens group moves. Move with the axis. However, in terms of chromatic aberration, it cannot be effectively reduced, and the requirements for thinning and high magnification cannot be achieved.

Therefore, it is necessary to improve the existing zoom lens assembly in order to effectively increase chromatic aberration, achieve thinning, and high magnification.

The present invention provides an improved zoom lens assembly that can effectively increase chromatic aberration and achieve the requirements of thinning and high magnification.

The present invention provides a zoom lens assembly that can zoom between a wide-angle state and a telephoto state. The zoom lens assembly is sequentially included from an object side to an image side along an optical axis. One of the positive refractive powers, the first lens group, the second lens group of the negative refracting power, the third lens group of the positive refractive power, the fourth lens group of the positive refractive power, and the fifth lens group including the positive refractive power of the two lenses. When the zoom lens assembly zooms from the wide-angle state to the telephoto state, the first lens group moves toward the object side side such that the distance between the first lens group and the second lens group increases and the second lens group and the third lens group The lens groups are close to each other, and the distance between the lenses of the third lens group and the fifth lens group is increased.

The first lens group includes a first lens and a second lens. The first lens includes a composite lens composed of a first lens and a second lens, and the second lens is a single lens.

The second lens group includes a first lens having a negative refracting power, a second lens having a negative refracting power, and a third lens having a positive refracting power. The first lens of the second lens group includes an aspherical surface, and the second lens of the second lens group is a lenticular lens. The third lens of the second lens group is a double concave lens.

The third lens group includes two positive lenses and one negative lens, and the two positive lenses and the negative lens are sequentially arranged from the object side to the image side. The two positive lenses of the third lens group are aspherical lenses.

The fourth lens group includes a convex lens.

The two lenses of the fifth lens group include a lenticular lens and a double concave lens.

The zoom lens assembly further includes an aperture disposed between the second lens group and the third lens group and movable along the optical axis.

Furthermore, according to another feature of the present invention, the present invention provides a zoom lens assembly that can zoom between a wide-angle state and a telephoto state. The zoom lens assembly of the present invention comprises five lens groups, and the five lens groups of the zoom lens assembly are from one object side to one image side, along an optical axis: one of the positive refractive powers, the first lens group, and the negative lens group. One of the diopter second lens group, one of the positive refractive powers, the third lens group, one of the positive refractive powers, the fourth lens group, and one of the positive refractive powers, the fifth lens group. When the zoom lens assembly zooms from the wide-angle state to the telephoto state, the first lens group moves toward the object side such that the distance between the first lens group and the second lens group increases and the third lens group faces The second lens group is moved such that the distance between the second lens group and the third lens group is reduced, the distance between the third lens group and the fifth lens group is increased, and the zoom lens assembly in the telephoto state is satisfied The following relationship:

TL/Tf/TY≦0.17

Among them, TL is the full length of the zoom lens assembly in the telephoto state, Tf is the focal length of the zoom lens assembly in the telephoto state, and TY is the effective imaging image height of the zoom lens assembly in the telephoto state.

Please refer to FIG. 1, 2A, 2B, and 2C. FIG. 1 is a schematic diagram showing the optical structure of a zoom lens assembly of the present invention, and FIG. 2A is a light path diagram of the zoom lens assembly of the present invention in a wide-angle state. 2B is an optical path diagram of the zoom lens assembly of the present invention in an intermediate state, and FIG. 2C is an optical path diagram of the zoom lens assembly of the present invention in a telephoto state.

As shown in Fig. 1, the zoom lens unit of the present invention can zoom between a wide-angle state and a telephoto state. The zoom lens assembly sequentially includes one of the first lens groups G1, which is one of positive refractive powers, from an object side to an image side (ie, from the left side to the right side of FIG. 1) along an optical axis a1-a1. One of the negative refractive powers, the second lens group G2, one aperture AP, one of the positive refractive powers, the third lens group G3, one of the positive refractive powers, the fourth lens group G4, and one of the positive refractive powers of the two lenses 51 and 52 for compensation A five lens group G5, a glass plate PL and an imaging surface 6. The surfaces of the first lens group G1, the second lens group G2, the aperture AP, the third lens group G3, the fourth lens group G4, the fifth lens group G5, the glass plate PL, and the imaging surface 6 are sequentially denoted by symbol S1. , S2, S3, S4, S5, S6, S7, S8, S9, S10, S11, S12, S13, S14, S15, S16, S17, S18, S19, S20, S21, S22, S23 are marked.

The first lens group G1 is fixed to the foremost end of the zoom lens unit to receive light. The first lens group G1 includes a first lens 11 and a second lens 12, wherein the first lens 11 includes a composite lens composed of a first lens 111 and a second lens 112, and the second lens 12 is a single lens. lens. The first lens 11 and the second lens 12 of the first lens group G1 may be molded by a plastic or glass material.

The zoom lens assembly can change the focal length via the second lens group G2. The second lens group G2 includes a first lens 21 having a negative refracting power, a second lens 22 having a negative refracting power, and a third lens 23 having a positive refracting power, wherein the second lens 22 and the third lens 23 are connected to each other . The first lens 21 of the second lens group G2 includes an aspherical surface S6. The first lens 21, the second lens 22, and the third lens 23 of the second lens group G2 may be molded by a plastic or glass material. In the embodiment, the second lens 22 of the second lens group G2 is a lenticular lens, and the third lens 23 of the second lens group G2 is a double concave lens.

The third lens group G3 is used as a compensation system in the zoom lens assembly. Since the position of the imaging surface 6 caused by the zooming can be compensated by the third lens group G3, the incident light of the zoomed surface can still be in a fixed position, except that the position of the imaging surface 6 can be fixed. The imaging surface 6 is focused to obtain a clear image. The third lens group G3 includes two positive lenses 31, 32 and a negative lens 33, wherein the two positive lenses 31, 32 and the negative lens 33 are sequentially arranged from the object side to the image side. In the present embodiment, the two positive lenses 31 and 32 of the third lens group G3 are aspherical lenses, and the negative lens 33 is a biconcave lens.

The aperture AP is located between the second lens group G2 and the third lens group G3 and is movable along the optical axis a1-a1.

The fourth lens group G4 is a convex lens 41 for positive refractive power for focusing.

The two lenses 51, 52 of the fifth lens group G5 are respectively a lenticular lens and a double concave lens.

The glass plate PL is disposed between the fifth lens group G5 and the image forming surface 6.

As shown in FIGS. 2A and 2C, when the zoom lens assembly is zoomed from the wide-angle state (FIG. 2A) to the telephoto state (FIG. 2C), the first lens group G1 moves toward the object side to make the first lens. The distance between the group G1 and the second lens group G2 is increased and the third lens group G3 is moved toward the second lens group G2 such that the distance between the second lens group G2 and the third lens group G3 is reduced (also That is, the second lens group G2 and the third lens group G3 are close to each other, and the distance between the two lenses 51 and 52 of the third lens group G3 and the fifth lens group G5 is increased.

The zoom lens assembly of the present invention satisfies the following relationship:

TL/Tf/TY≦0.17

Among them, TL is the full length of the zoom lens assembly in the telephoto state, Tf is the focal length of the zoom lens assembly in the telephoto state, and TY is the effective imaging image height of the zoom lens assembly in the telephoto state.

Based on the technical content of the above-described zoom lens assembly of the present invention, the zoom lens assembly of the present invention can be embodied according to the numerical examples in Table 1, Tables 2(a) to 2(d), and Tables 3 to 4 below, wherein Table 1 is a numerical example in the telephoto state, and Tables 2(a) to 2(d) are the aspherical coefficients in the telephoto state of the respective embodiments [1 to 15], and Table 3 is in the wide-angle state. In the intermediate state, the distance between the variable focal planes (S5, S10, S11, S16, and S18) in the telephoto state, Table 4 is the focal length of the wide-angle state, the intermediate state, and the telephoto state, and Table 5 is for each of the telephoto states. The focal length of the lens group (G1~G5).

3A is a schematic diagram of spherical aberration of a zoom lens assembly of the present invention in a wide-angle state, a pupil radius of 0.7911 MILLIMETERS (mm), and FIG. 3B is a zoom lens assembly of the present invention. The spherical aberration of the lower and pupil radius is 3.3777 MILLIMETERS (mm). 4A~4D is a coma curve diagram of the zoom lens assembly of the present invention in a wide-angle state, different imaging planes (IMA) (0.0000MM, 1.9000MM, 2.7440MM, 4.000MM), 5A~5D The coma curve of the zoom lens assembly of the present invention in a telephoto state, different imaging planes (IMA) (0.0000MM, 1.9000MM, 2.7440MM, 4.000MM), wherein the symbols EX, PX, EY, PY are represented by Coordinate axis. 3A-3B, 4A to 4D, and 5A to 5D are various graphs obtained based on the numerical values of the examples of the above respective tables.

As can be seen from the above description, the zoom lens assembly of the present invention is acted upon via a combination of the aperture AP and other mating elements movable between the second lens group G2 and the third lens group G3 and along the optical axis a1-a1. The high magnification can be obtained and the structure is thinned, and the imaging performance can be more effectively improved by the combination of the lenticular lens 51 of the fifth lens group G5 and the biconcave lens 52.

Although the present invention has been disclosed in the above preferred embodiments, it is not intended to limit the present invention, and the present invention can be modified and retouched without departing from the spirit and scope of the present invention. The scope of protection is subject to the definition of the scope of the patent application attached.

11. . . First lens

111. . . First lens

112. . . Second lens

12. . . Second lens

twenty one. . . First lens

twenty two. . . Second lens

twenty three. . . Third lens

31, 32. . . Positive lens

33. . . Negative lens

41. . . Convex lens

51, 52. . . lens

6. . . Imaging surface

A1-a1. . . Optical axis

AP. . . aperture

EX, PX, EY, PY. . . Coordinate axis

G1, G2, G3, G4, G5. . . First, second, third, fourth, and fifth lens groups

PL. . . Glass plate

IMA. . . Imaging plane

S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11, S12, S13, S14, S15, S16, S17, S18, S19, S20, S21, S22, S23. . . surface

TL. . . The full length of the zoom lens assembly in the telephoto state

1 is a schematic view showing an optical structure of a zoom lens assembly of the present invention;

2A is a light path diagram of the zoom lens assembly of the present invention in a wide-angle state;

2B is a light path diagram of the zoom lens assembly of the present invention in an intermediate state;

2C is a light path diagram of the zoom lens assembly of the present invention in a telephoto state;

3A is a schematic diagram of spherical aberration of the zoom lens assembly of the present invention in a wide angle state;

3B is a schematic diagram of spherical aberration of the zoom lens assembly of the present invention in a telephoto state;

4A to 4D are coma curves of the zoom lens assembly of the present invention in a wide angle state;

The 5A-5D diagram is a coma aberration diagram of the zoom lens assembly of the present invention in a telephoto state.

11. . . First lens

111. . . First lens

112. . . Second lens

12. . . Second lens

twenty one. . . First lens

twenty two. . . Second lens

twenty three. . . Third lens

31, 32. . . Positive lens

33. . . Negative lens

51, 52. . . lens

6. . . Imaging surface

A1-a1. . . Optical axis

AP. . . aperture

G1, G2, G3, G4, G5. . . First, second, third, fourth, and fifth lens groups

PL. . . Glass plate

S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11, S12, S13, S14, S15, S16, S17, S18, S19, S20, S21, S22, S23. . . surface

TL. . . The full length of the zoom lens assembly in the telephoto state

Claims (18)

A zoom lens assembly is capable of zooming between a wide-angle state and a telephoto state, the zoom lens assembly sequentially including one of positive refractive powers from an object side to an image side, along an optical axis a group, a second lens group of negative diopter, a third lens group of positive refracting power, a fourth lens group of positive refracting power, and a fifth lens group including positive diopter of two lenses, wherein the third lens group includes two a positive lens and a negative lens, the two positive lenses and the negative lens are sequentially arranged from the object side to the image side; when the zoom lens assembly zooms from the wide angle state to the telephoto state, the first a lens group is moved toward the object side such that a distance between the first lens group and the second lens group increases and the second lens group and the third lens group are close to each other, The distance between the third lens group and the two lens groups of the fifth lens group increases. The zoom lens assembly of claim 1, wherein the first lens group comprises a first lens and a second lens, and the first lens comprises a first lens and a second lens. A composite lens that is a single lens. The zoom lens assembly of claim 1, wherein the second lens group comprises a first lens having a negative refracting power, a second lens having a negative refracting power, and a third lens having a positive refracting power. The zoom lens assembly of claim 3, wherein the first lens of the second lens group comprises an aspherical surface, and the second lens of the second lens group is a lenticular lens. The zoom lens assembly of claim 3, wherein The third lens of the second lens group is a double concave lens. The zoom lens assembly of claim 1, wherein the two positive lenses of the third lens group are aspherical lenses. The zoom lens assembly of claim 1, wherein the fourth lens group comprises a convex lens. The zoom lens assembly of claim 1, wherein the two lenses of the fifth lens group comprise a lenticular lens and a double concave lens. The zoom lens assembly of claim 1, further comprising an aperture disposed between the second lens group and the third lens group and movable along the optical axis. A zoom lens assembly is capable of zooming between a wide-angle state and a telephoto state, the zoom lens assembly including five lens groups, the five lens groups of the zoom lens assembly being from an object side to an image side And along an optical axis: one of the positive refractive power, one of the first lens group, one of the negative refractive powers, the second lens group, one of the positive refractive powers, the third lens group, one of the positive refractive powers, the fourth lens group, and one of the positive refractive powers. a five lens group, wherein the third lens group comprises two positive lenses and a negative lens, the two positive lenses and the negative lens are sequentially arranged from the object side to the image side; when the zoom lens assembly is When zooming from the wide-angle state to the telephoto state, the first lens group moves toward the object side such that the distance between the first lens group and the second lens group increases and the third lens group faces Moving the second lens group such that a distance between the second lens group and the third lens group is reduced, between the third lens group and the fifth lens group The distance is increased, and the zoom lens assembly in the telephoto state satisfies the following relationship: TL/Tf/TY≦0.17, where TL is the full length of the zoom lens assembly in the telephoto state, and Tf is the The zoom lens assembly is located at a focal length in the telephoto state, and the TY is an effective imaging image height of the zoom lens assembly in the telephoto state. The zoom lens assembly of claim 10, wherein the first lens group comprises a first lens and a second lens, and the first lens comprises a first lens and a second lens. A composite lens that is a single lens. The zoom lens assembly of claim 10, wherein the second lens group comprises a first lens having a negative refracting power, a second lens having a negative refracting power, and a third lens having a positive refracting power. The zoom lens assembly of claim 12, wherein the first lens of the second lens group comprises an aspherical surface. The zoom lens assembly of claim 12, wherein the second lens of the second lens group is a lenticular lens, and the third lens of the second lens group is a double concave lens. The zoom lens assembly of claim 10, wherein the two positive lenses of the third lens group are aspherical lenses. The zoom lens assembly of claim 10, wherein the fourth lens group comprises a convex lens. The zoom lens assembly of claim 10, wherein The fifth lens group includes a lenticular lens and a double concave lens. The zoom lens assembly of claim 10, further comprising an aperture disposed between the second lens group and the third lens group and movable along the optical axis.