TW201723557A - Optical lens - Google Patents

Abstract

An optical lens lets object light rays move from an object side to an image side on an optical axis and form an image on an image plane. The optical lens includes a lens group constructing the optical axis, including a first lens and a second lens sequentially from the image side to the object side, wherein the image-side surface of the first lens is a concave surface and has a point of inflection; and a first aperture stop and a second aperture stop respectively located on the optical axis. The optical lens meets the thinning tendency.

Description

Optical lens

The present invention relates to an optical lens, and more particularly to an optical lens having two apertures.

Optical lenses generally have an aperture, and even an aperture-adjustable aperture is provided, that is, the aperture size of the aperture can be adjusted automatically or manually. In the conventional optical lens, the aperture-adjustable aperture is disposed between the two lenses within the lens system. Such an optical lens must provide sufficient space for mounting the structural member or electronic control component required for the aperture-adjustable aperture. Therefore, such an optical lens has a problem that it cannot be further thinned.

It is an object of the present invention to provide an optical lens that solves the problem that the conventional optical lens cannot be further thinned.

In order to achieve the above object, the present invention provides an optical lens that causes an object light to pass from an object side to an image side of an optical axis, and forms an image on an imaging plane, the optical lens comprising: a lens group, which constitutes the optical lens The optical axis includes a first lens and a second lens from the image side to the object side, wherein the image side surface of the first lens is concave and has an inflection point; and a first aperture and a The second aperture is located on the optical axis.

Another aspect of the present invention provides an optical lens that causes an object light to pass from an object side to an image side of an optical axis, and forms an image on an imaging plane, the optical lens comprising: a lens group constituting the optical axis; a first aperture disposed within the lens group; and a second aperture positioned on the object side of the optical axis and outside the lens group.

The optical lens of the present invention increases the effective aperture range of the aperture, and the optical lens of the present invention can set the aperture-adjustable aperture outside the lens, compared to the optical lens in the prior art in which the aperture-adjustable aperture is disposed in the lens group. Therefore, the structural member or the electronic control component required to mount the aperture-adjustable aperture can be moved to the outside of the lens, so that the optical lens can be further thinned.

11‧‧‧Shell

12‧‧‧Translucent panels

13‧‧‧ Covering board

14‧‧‧ aperture adjustment blade

15‧‧‧Optical system framework

16‧‧‧floor

17‧‧‧Lens system

18‧‧‧Image recorder

19‧‧‧ screws

110‧‧‧ openings

130‧‧‧ openings

160‧‧‧ openings

IMA‧‧‧

IP‧‧‧ imaging surface

IR‧‧‧ color filters

L1‧‧‧ first lens

L2‧‧‧ second lens

L3‧‧‧ third lens

L4‧‧‧4th lens

L5‧‧‧ fifth lens

OA‧‧‧ optical axis

OBJ‧‧‧ object

STO1‧‧‧ first aperture

STO2‧‧‧second aperture

Fig. 1A is a view showing the optical structure of the optical lens of the first embodiment of the present invention.

Fig. 1B is a view showing the field curvature and distortion of the optical lens of the first embodiment of the present invention when the first aperture STO1 is in the active state and the second aperture STO2 is in the inactive state.

Fig. 1C is a graph showing the curvature of field and distortion of the optical lens of the first embodiment of the present invention when the first aperture STO1 is in an inactive state and the second aperture STO2 is in an active state.

1D is a multi-color diffraction modulation transfer function (MTF) diagram of the optical lens according to the first embodiment of the present invention when the first aperture STO1 is in the active state and the second aperture STO2 is in the inactive state.

Fig. 1E is a view showing a multicolor diffraction modulation conversion function diagram of the optical lens according to the first embodiment of the present invention when the first aperture STO1 is in an inactive state and the second aperture STO2 is in an active state.

Fig. 2A is a view showing the optical structure of the aperture switchable optical lens of the second embodiment of the present invention.

Fig. 2B is a graph showing the curvature of field and distortion of the optical lens of the second embodiment of the present invention when the first aperture STO1 is in the active state and the second aperture STO2 is in the inactive state.

Fig. 2C is a graph showing the curvature of field and distortion of the optical lens of the second embodiment of the present invention when the first aperture STO1 is in the inactive state and the second aperture STO2 is in the active state.

Fig. 2D is a view showing a multicolor diffraction modulation conversion function diagram of the optical lens according to the second embodiment of the present invention when the first aperture STO1 is in the active state and the second aperture STO2 is in the inactive state.

Fig. 2E is a view showing a multicolor diffraction modulation conversion function diagram of the optical lens according to the second embodiment of the present invention when the first aperture STO1 is in an inactive state and the second aperture STO2 is in an active state.

Fig. 3A is a view showing the optical structure of the aperture switchable optical lens of the third embodiment of the present invention.

Fig. 3B is a graph showing the curvature of field and distortion of the optical lens of the third embodiment of the present invention when the first aperture STO1 is in the active state and the second aperture STO2 is in the inactive state.

Fig. 3C is a graph showing the curvature of field and distortion of the optical lens of the third embodiment of the present invention when the first aperture STO1 is in the inactive state and the second aperture STO2 is in the active state.

Fig. 3D is a view showing a multicolor diffraction modulation conversion function diagram of the optical lens according to the third embodiment of the present invention when the first aperture STO1 is in the active state and the second aperture STO2 is in the inactive state.

Fig. 3E is a view showing a multicolor diffraction modulation conversion function diagram of the optical lens according to the third embodiment of the present invention when the first aperture STO1 is in an inactive state and the second aperture STO2 is in an active state.

Fig. 4A is a view showing the optical structure of the aperture switchable optical lens of the fourth embodiment of the present invention.

Fig. 4B is a graph showing the curvature of field and distortion of the optical lens of the fourth embodiment of the present invention when the first aperture STO1 is in the active state and the second aperture STO2 is in the inactive state.

Fig. 4C is a graph showing the curvature of field and distortion of the optical lens of the fourth embodiment of the present invention when the first aperture STO1 is in the inactive state and the second aperture STO2 is in the active state.

Fig. 4D is a view showing a multicolor diffraction modulation conversion function diagram of the optical lens according to the fourth embodiment of the present invention when the first aperture STO1 is in the active state and the second aperture STO2 is in the inactive state.

Fig. 4E is a view showing a multicolor diffraction modulation conversion function of the optical lens according to the fourth embodiment of the present invention when the first aperture STO1 is in an inactive state and the second aperture STO2 is in an active state.

Fig. 5A is a view showing the optical structure of the aperture switchable optical lens of the fifth embodiment of the present invention.

Fig. 5B is a graph showing the curvature of field and distortion of the optical lens of the fifth embodiment of the present invention when the first aperture STO1 is in the active state and the second aperture STO2 is in the inactive state.

Fig. 5C is a graph showing the curvature of field and distortion of the optical lens of the fifth embodiment of the present invention when the first aperture STO1 is in the inactive state and the second aperture STO2 is in the active state.

Fig. 5D is a view showing a multicolor diffraction modulation conversion function diagram of the optical lens according to the fifth embodiment of the present invention when the first aperture STO1 is in the active state and the second aperture STO2 is in the inactive state.

Fig. 5E is a view showing a multicolor diffraction modulation conversion function of the optical lens according to the fifth embodiment of the present invention when the first aperture STO1 is in an inactive state and the second aperture STO2 is in an active state.

Fig. 6 is a view showing the package structure of the optical lens according to the first embodiment of the present invention.

Fig. 7 is a view showing the package structure of the optical lens according to the second embodiment of the present invention.

The above and other objects, features and advantages of the present invention will become more <RTIgt;

For the sake of simplicity and ease of understanding, the features depicted in the present disclosure and The components and/or orientations are exemplified by the size and/or orientation relative to each other, but the actual dimensions and/or orientations are substantially different from the illustrated dimensions and/or orientations, for the sake of clarity, the features and/or the illustrated features and/or The size or relative size of the elements may be exaggerated or reduced, and the same or similar elements are denoted by the same element numbers for clarity and conciseness, and the description of well-known functions and constructions is omitted.

The optical lens provided by the invention can be applied to various lens-equipped image capturing devices, such as mobile phones, smart phones, tablets, small notebooks, notebook computers, personal data assistants (PDAs), palm-sized or portable computers, Smart watches, smart glasses, smart wearable devices, game consoles, cameras, cameras, surveillance equipment, IP CAM, driving recorders, reversing and developing equipment, and various sensors.

The basic structure of the optical lens of the present invention is shown in FIG. 1A (corresponding to the first embodiment), 2A (corresponding to the second embodiment), 3A (corresponding to the third embodiment), and 4A (Fig. 4A). Corresponding to the fourth embodiment) and FIG. 5A (corresponding to the fifth embodiment), the optical lens includes a lens group which is positioned on the optical axis OA to constitute the optical axis OA, and the object light is from the object side OBJ of the optical axis OA. The optical system is entered and an image is formed on the imaging plane IP of the image side IMA. The optical lens further includes a first aperture STO1 and a second aperture STO2. Preferably, the first aperture STO1 is located within the lens group, that is, between the two lenses of the lens group, and the second aperture STO2 It is located outside the object side OBJ of the optical axis OA, outside the lens group, that is, the outer side of the lens closest to the object side OBJ in the lens group.

In the illustrated optical lens, when a smaller aperture aperture is required, the aperture aperture of the optical lens is defined by the second aperture STO2; and when a larger aperture aperture is required, the aperture aperture of the optical lens is determined by the An aperture STO1 is defined. For example, when you need less In the aperture aperture, the aperture of the second aperture STO2 can be adjusted to be at least smaller than the aperture of the first aperture STO1. At this time, since the aperture of the first aperture STO1 is larger than the aperture of the second aperture STO2, in the evolution of the optical path, The first aperture STO1 is inactive, in an inactive state, and the second aperture STO2 is in an active state, at which time the aperture aperture of the optical lens is defined by the second aperture STO2; and when a larger aperture aperture is required, The aperture of the second aperture STO2 is adjusted to be larger than the aperture of the first aperture STO1. At this time, in the evolution of the optical path, the second aperture STO2 is disabled, in an inactive state, and the first aperture STO1 is in an active state. The aperture aperture of the optical lens is defined by the first aperture STO1. The above example is described by taking the second aperture STO2 as an aperture-adjustable aperture as an example. However, the first aperture STO1 has an adjustable aperture, or both the first aperture STO1 and the second aperture STO2 have adjustable apertures to achieve the above effects. However, the second aperture STO2 has a special advantage in that the aperture is adjustable, and the aperture-adjustable aperture can be disposed outside the lens on the object side, and there is more space for accommodating the aperture adjustment device, thereby reducing the size of the lens.

The optical architecture described above increases the effective aperture range of the aperture, and the optical lens of the present invention can set the aperture-adjustable aperture to the outside of the lens, compared to the optical lens in the prior art in which the aperture-adjustable aperture is disposed in the lens group. The second aperture STO2), so that the structural member or the electronic control component required for mounting the aperture-adjustable aperture can be moved to the outside of the lens, so that the optical lens can be further thinned.

The package structure of the optical lens of the present invention is exemplified as follows.

Please refer to FIG. 6, which is a schematic diagram showing the package structure of the optical lens according to the first embodiment of the present invention. The optical lens is packaged in an electronic device having an imaging function, and is located inside the casing 11 of the electronic device. The casing 11 exposes an opening 110 through which light can enter the inside of the optical lens. The optical lens is provided with an optical system frame 15, a lens system The system 17 and an image recorder 18. The optical system frame 15 is made of plastic, which is a fixture in an optical system. Lens system 17 includes one or more lenses disposed on optical system frame 15. Image recorder 18 can receive light that passes through lens system 17 to form an image on the image plane. The optical lens is provided with a light transmissive plate 12, a cover plate 13, a bottom plate 16, and one or more aperture adjustment blades 14. The bottom plate 16 is fixed to or formed by the optical system frame 15, and the bottom plate 16 has an opening 160 at the central portion. The cover plate 13 is spaced apart from the bottom plate 16 and is fixed to the bottom plate 16 or the optical system frame 15. The cover plate 13 is a metal plate, and an opening 130 is defined in the central portion corresponding to the opening 160 of the bottom plate 16. The aperture adjustment blade 14 is disposed in an accommodation space formed between the cover plate 13 and the bottom plate 16. The optical lens is an aperture-adjustable lens, and the aperture adjustment blade 14 is driven by a driver (not shown) of the aperture adjustment device, and the position of the blade 14 is adjusted by adjusting the aperture to change the size of the aperture. The light transmissive plate 12 is disposed inside the outer casing 11 in close proximity to the exposed opening 110 of the outer casing 11 and is then attached to the optical system frame 15. As can be seen from FIG. 6, from the image side to the object side, that is, the image recorder 18 to the opening 110 exposed from the outer casing 11, the lens system 17, the bottom plate 16, the diaphragm adjusting blade 14, the cover plate 13, and the light-transmitting plate are sequentially arranged. 12.

Since the aperture adjustment blade 14 is disposed between the outermost lens and the exposed opening 110 of the outer casing 11, there is more space on the side to accommodate the driver than the arrangement between the two lenses, and the effect is not affected. Configuration of other components. Furthermore, the light-transmitting plate 12 can be fixed to the optical system frame 15, and this technical solution can further prevent the dust from falling into the blade chamber accommodating the diaphragm adjusting blade 14.

Please refer to FIG. 7, which shows a package architecture diagram of an optical lens according to a second embodiment of the present invention. Compared with the package structure of the first embodiment described above, in the embodiment, the bottom plate 16 The cover plate 13 is disposed on the upper side, and the cover plate 13 is locked and fixed to the bottom plate 16 or the optical system frame 15 by screws 19. The cover plate 13 is spaced apart from the bottom plate 16 by a distance therebetween, and the cover plate 13 and the bottom plate 16 are separated. The aperture adjustment blade 14 is placed. As can be seen from FIG. 7, from the image side to the object side, that is, the image recorder 18 to the opening 110 exposed from the outer casing 11, the lens system 17, the cover plate 13, the diaphragm adjusting blade 14, the bottom plate 16, and the light transmitting plate are sequentially arranged. 12. In this technical solution, the cover plate 13 is moved to the lower side, and the plastic optical frame 15 of the plastic material is partially cut to configure the space provided by the screw 19, so that the position of the screw lock can be moved downward, so that In the embodiment of Fig. 6, this embodiment can reduce the thickness of the optical lens, thereby reducing the thickness of the device in which the optical lens is disposed.

In the following, five specific embodiments will be described by taking a mobile phone lens as an example. The optical lens provided by the present invention will be further described in detail, and the data used in each specific embodiment will be listed. The first embodiment is shown in the first embodiment of FIG. 1A to FIG. The second embodiment is shown in Figures 2A to 2E, the third embodiment is shown in Figures 3A to 3E, the fourth embodiment is shown in Figures 4A to 4E, and the fifth embodiment is shown in Figures 5A to 5E. .

Some lenses in the optical lens of the present invention are aspherical lenses, and the shape of the aspherical lens can be expressed as follows: Where z represents the amount of sags of the aspherical lens at a relative height from the central axis of the lens, C represents the reciprocal of the paraxial radius of curvature, r represents the relative height of the aspherical lens from the central axis of the lens, and k represents the aspherical lens Conic constant, and α ₁ , α ₂ , ..., α ₁₀ are even-order aspherical correction coefficients of second order or more.

First embodiment:

1A is a schematic view showing the optical structure of an optical lens according to a first embodiment of the present invention. The optical lens of the first embodiment of the present invention is composed of five lenses, which are sequentially from the image side IMA to the object side OBJ as the first lens L1. a second lens L2, a third lens L3, a fifth lens L5, and a fourth lens L4. The optical lens uses two low-dispersion lenses L2 and L3, and three high-dispersion lenses L1, L4, and L5, which are bent. The light-rate architecture is positively positive and negative from the image side to the object side. Specifically, the first lens L1 is a lens having a negative refractive power, the image side surface thereof is a concave surface, and has at least one inflection point; and the second lens L2 is a lens having a positive refractive power, which has an object side end. The concave surface and the convex side of the image side end; the third lens L3 approximates a plano-concave lens; the fifth lens L5 approximates a crescent convex lens; and the fourth lens L4 approximates a crescent convex lens.

The optical lens of the first embodiment of the present invention has at least two apertures STO, that is, a first aperture STO1 and a second aperture STO2, the first aperture STO1 is located between the fourth lens L4 and the fifth lens L5, and the second aperture STO2 It is located on the outer side of the lens closest to the object side (ie, the fourth lens L4). The distance from the first aperture STO1 to the imaging plane IP on the optical axis is SL1, the distance from the second aperture STO2 to the imaging plane IP on the optical axis is SL2, and the lens closest to the object side (ie, the fourth lens L4) The optical lens of the first embodiment of the present invention satisfies the following relationship: 1.2 < (SL1 + SL2) / TTL < 2.5.

As shown in the following Table 1, which shows the relevant parameter table of each lens of the optical lens when the first aperture STO1 is in the active state and the second aperture STO2 is in the inactive state in FIG. 1A, the first embodiment shows the optical lens of the first embodiment of the present invention. The overall focal length is 4.363, and the diopter of each lens is -6.54966, 20.2192, -4.7998, 4.1284 from L1, L2, L3, L5 to L4. 4.7496, when the first aperture STO1 is active, the optical system has an effective aperture value of 1.8, a viewing angle of 76 degrees, and a total lens length of 5.21 mm. In addition, when the second aperture STO2 is in an active state, the effective aperture of the optical system The value is 2.4.

Table 2 shows the relevant parameter table of the aspherical lens in Table 1.

FIG. 1B is a view showing the field curvature and distortion of the optical lens of the first embodiment of the present invention when the first aperture STO1 is in the active state and the second aperture STO2 is in the inactive state, FIG. 1C. FIG. 1D is a view showing the field curvature and distortion of the optical lens according to the first embodiment of the present invention when the first aperture STO1 is in an inactive state and the second aperture STO2 is in an active state, and FIG. 1D is a view showing the optical lens of the first embodiment of the present invention. A multi-color diffraction modulation transfer function (MTF) map when the first aperture STO1 is in the active state and the second aperture STO2 is in the inactive state, and FIG. 1E shows the optical lens according to the first embodiment of the present invention. A multi-color diffraction modulation transfer function diagram when an aperture STO1 is in an inactive state and the second aperture STO2 is in an active state.

Second embodiment:

2A is a schematic view showing the optical structure of an optical lens according to a second embodiment of the present invention. The optical lens according to the second embodiment of the present invention is composed of five lenses, which are sequentially from the image side IMA to the object side OBJ as the first lens L1. Second lens L2, third lens L3, fifth lens L5, and fourth Lens L4, which uses a low-dispersion lens L5 with four high-dispersion lenses L1, L2, L3, and L4, and its refractive index architecture is positive plus positive and negative from the image side to the object side. Specifically, the first lens L1 is a lens having a negative refractive power, the image side surface thereof is a concave surface, and has at least one inflection point; and the second lens L2 is a lens having a positive refractive power, which has an object side end. The concave surface and the convex side of the image side end; the third lens L3 approximates a lenticular lens; the fifth lens L5 approximates a crescent lens; and the fourth lens L4 approximates a lenticular lens.

The optical lens of the second embodiment of the present invention has at least two apertures STO, that is, a first aperture STO1 and a second aperture STO2, the first aperture STO1 is located between the fourth lens L4 and the fifth lens L5, and the second aperture STO2 It is located on the outer side of the lens closest to the object side (ie, the fourth lens L4). The distance from the first aperture STO1 to the imaging plane IP on the optical axis is SL1, the distance from the second aperture STO2 to the imaging plane IP on the optical axis is SL2, and the lens closest to the object side (ie, the fourth lens L4) The optical lens of the second embodiment of the present invention satisfies the following relationship: 1.2 < (SL1 + SL2) / TTL < 2.5.

As shown in the following Table 3, which shows the relevant parameter table of each lens of the optical lens when the first aperture STO1 is in the active state and the second aperture STO2 is in the inactive state in FIG. 2A, the data sheet of the second embodiment of the present invention is shown in Table 3. The overall focal length is 3.29213, and the diopter of each lens is from -1.46914, 3.08563, 7.68479, -358.248, and 2.46913 from L1, L2, L3, and L5 to L4. When the first aperture STO1 is active, the optical system The effective aperture value is 2.0, the viewing angle is 69 degrees, and the total length of the lens is 3.97 mm. In addition, when the second aperture STO2 is active, the effective aperture value of the optical system is 2.8.

Table 4 shows the relevant parameter tables for the aspherical lenses in Table 3.

FIG. 2B is a view showing the field curvature and distortion of the optical lens according to the second embodiment of the present invention when the first aperture STO1 is in the active state and the second aperture STO2 is in the inactive state, FIG. 2C. FIG. 2D is a view showing the field curvature and distortion of the optical lens according to the second embodiment of the present invention when the first aperture STO1 is in an inactive state and the second aperture STO2 is in an active state, and FIG. 2D is a view showing the optical lens of the second embodiment of the present invention. A multi-color diffractive modulation transfer function (MTF) map when the first aperture STO1 is in the active state and the second aperture STO2 is in the inactive state, and FIG. 2E shows the optical lens according to the second embodiment of the present invention. A multi-color diffraction modulation transfer function diagram when an aperture STO1 is in an inactive state and the second aperture STO2 is in an active state.

Third embodiment:

3A is a schematic view showing the optical structure of an optical lens according to a third embodiment of the present invention. The optical lens according to the third embodiment of the present invention is composed of four lenses, which are sequentially from the image side IMA to the object side OBJ as the first lens L1. , the second lens L2, the third lens L3 and the fourth lens L4, the optical lens uses a low dispersion lens L3, and three high dispersion lens L1, L2 and L4, the refractive index structure from the image side to The object side is negative positive and negative. Specifically, the first lens L1 is a lens having a negative refractive power, the image side surface thereof is a concave surface, and has at least one inflection point; and the second lens L2 is a lens having a positive refractive power, which has an object side end. The concave surface and the convex surface of the image side end; the third lens L3 approximates a crescent lens; and the fourth lens L4 approximates a lenticular lens.

The optical lens of the third embodiment of the present invention has at least two apertures STO, that is, a first aperture STO1 and a second aperture STO2, the first aperture STO1 is located between the third lens L3 and the fourth lens L4, and the second aperture STO2 It is located on the outer side of the lens closest to the object side (ie, the fourth lens L4). The distance from the first aperture STO1 to the imaging plane IP on the optical axis is SL1, the distance from the second aperture STO2 to the imaging plane IP on the optical axis is SL2, and the lens closest to the object side (ie, the fourth lens L4) The distance from the object side surface to the imaging plane IP on the optical axis is TTL, and the optical lens of the fourth embodiment of the present invention satisfies the following relationship: 1.2 < (SL1 + SL2) / TTL < 2.5.

Table 5 below shows the relevant parameter table of each lens of the optical lens when the first aperture STO1 is in the active state and the second aperture STO2 is in the inactive state in FIG. 3A. Table 5 shows the optical lens of the third embodiment of the present invention. The overall focal length is 2.224, and the diopter of each lens is from -1.27834, 1.16262, -2.82002, and 1.81389 from L1 to L4. When the first aperture STO1 is active, the effective aperture value of this optical system is 1.8, and the viewing angle is At 70 degrees, the total length of the lens is 3.09 mm. In addition, when the second aperture STO2 is in the active state, the effective aperture value of the optical system is 2.4.

Table 6 shows the relevant parameter tables for the aspherical lenses in Table 5.

FIG. 3B is a view showing the field curvature and distortion of the optical lens according to the third embodiment of the present invention when the first aperture STO1 is in the active state and the second aperture STO2 is in the inactive state, FIG. 3C. A graph showing the curvature of field and distortion of the optical lens according to the third embodiment of the present invention when the first aperture STO1 is in an inactive state and the second aperture STO2 is in an active state, and FIG. 3D is a view showing the optical lens of the third embodiment of the present invention. A multi-color diffraction modulation transfer function (MTF) map when the first aperture STO1 is in the active state and the second aperture STO2 is in the inactive state, and FIG. 3E shows the optical lens according to the third embodiment of the present invention. A multi-color diffraction modulation transfer function diagram when an aperture STO1 is in an inactive state and the second aperture STO2 is in an active state.

Fourth embodiment:

4A is a schematic view showing the optical structure of an optical lens according to a fourth embodiment of the present invention. The optical lens according to the fourth embodiment of the present invention is composed of four lenses, which are sequentially from the image side IMA to the object side OBJ as the first lens L1. , the second lens L2, the third lens L3 and the fourth lens L4, the optical lens uses a low dispersion lens L2, and three high dispersion lens L1, L3 and L4, the refractive index structure from the image side to The object side is negative and positive. Specifically, the first lens L1 is a lens having a negative refractive power, the image side surface thereof is a concave surface, and has at least one inflection point; and the second lens L2 is a lens having a negative refractive power, which has an object side end. The concave surface and the convex side of the image side end; the third lens L3 is similar to a crescent convex lens having a concave side of the object side end and a convex side of the image side end; and the fourth lens L4 is similar to the crescent convex lens.

The optical lens according to the fourth embodiment of the present invention has at least two apertures STO, that is, a first aperture STO1 and a second aperture STO2, the first aperture STO1 is located between the third lens L3 and the fourth lens L4, and the second aperture STO2 It is located on the outer side of the lens closest to the object side (ie, the fourth lens L4). The distance from the first aperture STO1 to the imaging plane IP on the optical axis is SL1, the distance from the second aperture STO2 to the imaging plane IP on the optical axis is SL2, and the lens closest to the object side (ie, the fourth lens L4) The distance from the object side surface to the imaging plane IP on the optical axis is TTL, and the optical lens of the fourth embodiment of the present invention satisfies the following relationship: 1.2 < (SL1 + SL2) / TTL < 2.5.

Table 7 below shows the related parameter table of each lens of the optical lens when the first aperture STO1 is in the active state and the second aperture STO2 is in the inactive state in FIG. 4A, and the seventh embodiment shows the optical lens of the fourth embodiment of the present invention. The overall focal length is 2.3182, and the diopter of each lens is -14.3533, -4.61481, 2.07924, and 3.143393 from L1 to L4. When the first aperture STO1 is active, the effective aperture value of the optical system is 1.8, and the viewing angle is 89 degrees, the total length of the lens is 3.409mm, and when the second aperture STO2 is active, the effective light of the optical system The circle value is 2.8.

Table 8 shows the relevant parameter tables for the aspherical lenses in Table 7.

4B is a view showing the optical lens of the fourth embodiment of the present invention in the first aperture The field curvature and distortion representation of the STO1 in the active state, the second aperture STO2 in the inactive state, and the 4Cth diagram show that the optical lens of the fourth embodiment of the present invention is in the first aperture STO1 The action state, the performance picture of the field curvature and the distortion when the second aperture STO2 is in the active state, and the 4D figure shows that the optical lens of the fourth embodiment of the present invention is in the active state of the first aperture STO1 and the second aperture STO2 is in the inactive state. a multi-color diffractive modulation transfer function (MTF) map, and FIG. 4E shows an optical lens according to a fourth embodiment of the present invention when the first aperture STO1 is in an inactive state and the second aperture STO2 is in an active state. Multicolor diffraction modulation transfer function diagram.

Fifth embodiment:

5A is a schematic view showing the optical structure of an optical lens according to a fifth embodiment of the present invention. The optical lens according to the fifth embodiment of the present invention is composed of five lenses, which are sequentially from the image side IMA to the object side OBJ as the first lens L1. a second lens L2, a third lens L3, a fifth lens L5, and a fourth lens L4. The optical lens uses two low-dispersion lenses L2 and L3, and three high-dispersion lenses L1, L4, and L5, which are bent. The light-rate architecture is positively positive and negative from the image side to the object side. Specifically, the first lens L1 is a lens having a negative refractive power, the image side surface thereof is a concave surface, and has at least one inflection point; and the second lens L2 is a lens having a positive refractive power, which has an object side end. The concave surface and the convex side of the image side end; the third lens L3 is approximate to a crescent lens; the fifth lens L5 is approximated to a crescent convex lens; and the fourth lens L4 is approximated to a crescent convex lens.

The optical lens according to the fifth embodiment of the present invention has at least two apertures STO, that is, a first aperture STO1 and a second aperture STO2, the first aperture STO1 is located between the fourth lens L4 and the fifth lens L5, and the second aperture STO2 It is located on the outer side of the lens closest to the object side (ie, the fourth lens L4). The distance from the first aperture STO1 to the imaging plane IP on the optical axis is SL1, and the second aperture STO2 is The fifth embodiment of the present invention is that the distance of the imaging plane IP on the optical axis is SL2, and the distance from the object side surface of the lens closest to the object side (ie, the fourth lens L4) to the imaging plane IP on the optical axis is TTL. The optical lens satisfies the following relationship: 1.2 < (SL1 + SL2) / TTL < 2.5.

Table 9 below shows the relevant parameter table of each lens of the optical lens when the first aperture STO1 is in the active state and the second aperture STO2 is in the inactive state in FIG. 5A, and the optical lens of the fifth embodiment of the present invention is shown in Table 9 The overall focal length is 4.156, and the diopter of each lens is from -7.5603, 17.4728, -4.8351, 4.09945, 4.87028 from L1, L2, L3, L5 to L4. When the first aperture STO1 is active, the optical system The effective aperture value is 1.6, the viewing angle is 79 degrees, and the total length of the lens is 5.19 mm. In addition, when the second aperture STO2 is active, the effective aperture value of the optical system is 2.6.

Table 10 shows the relevant parameter table of the aspherical lens in Table 9.

FIG. 5B is a view showing the field curvature and distortion of the optical lens according to the fifth embodiment of the present invention when the first aperture STO1 is in the active state and the second aperture STO2 is in the inactive state, FIG. 5C. FIG. 5D is a view showing the field curvature and distortion of the optical lens according to the fifth embodiment of the present invention when the first aperture STO1 is in an inactive state and the second aperture STO2 is in an active state, and FIG. 5D is a view showing the optical lens of the fifth embodiment of the present invention. Multi-color winding when the first aperture STO1 is in the active state and the second aperture STO2 is in the inactive state A modulation transfer function (MTF) map, and FIG. 5E shows a multi-color diffraction modulation of the optical lens according to the fifth embodiment of the present invention when the first aperture STO1 is in an inactive state and the second aperture STO2 is in an active state. Conversion function graph.

While the invention has been described above in terms of the preferred embodiments, the invention is not intended to limit the invention, and the invention may be practiced without departing from the spirit and scope of the invention. The scope of protection of the present invention is therefore defined by the scope of the appended claims.

IMA‧‧‧

IP‧‧‧ imaging surface

IR‧‧‧ color filters

L1‧‧‧ first lens

L2‧‧‧ second lens

L3‧‧‧ third lens

L4‧‧‧4th lens

L5‧‧‧ fifth lens

OA‧‧‧ optical axis

OBJ‧‧‧ object

STO1‧‧‧ first aperture

STO2‧‧‧second aperture

Claims (13)

An optical lens that causes an object light to pass from an object side to an image side of an optical axis, and forms an image on an imaging plane, the optical lens comprising: a lens group constituting the optical axis, from the image side to The object side includes a first lens and a second lens, wherein the image side surface of the first lens is concave and has an inflection point; and a first aperture and a second aperture are respectively located in the light On the shaft. The optical lens of claim 1, wherein the first lens has a refractive index of negative. The optical lens of claim 2, wherein the lens group sequentially includes the first lens, the second lens, a third lens and a fourth lens from the image side to the object side, and the lens The refractive power of the fourth lens is positive. The optical lens of claim 3, wherein the lens group further comprises a fifth lens disposed between the three lens and the fourth lens, and the second lens has a positive refractive power, the At least one of the third lens and the fifth lens is a positive refractive power. The optical lens of claim 4, wherein the fourth lens is a crescent-shaped convex lens, the fifth lens is a crescent-shaped convex lens, and the third lens is a plano-concave lens, and the second lens includes an object side end Concave and convex side like side. The optical lens according to any one of claims 1 to 5, wherein the second aperture is located between the object side and the first lens, and the image of the first aperture is located on the optical axis. Side and the Between the first lenses. The optical lens according to any one of claims 1 to 5, further comprising: an optical system frame for the lens group to be disposed thereon; a bottom plate fixed to or from the optical system frame The optical system frame is extended; a cover plate is spaced apart from the bottom plate and fixed on the bottom plate; one or more aperture adjustment blades are included in the second aperture, and the size of the second aperture is adjusted by the aperture Changing the blade, the aperture adjustment blade is disposed between the cover plate and the bottom plate; and a light transmissive plate, followed by the optical system frame; wherein the lens group, the bottom plate, the aperture adjustment blade, the cover plate, and The light transmissive plates are sequentially arranged along the image side to the object side. An optical lens that makes an object light from an object side to an image side of an optical axis and forms an image on an imaging plane, the optical lens comprising: a lens group constituting the optical axis; and a first aperture Located within the lens group; and a second aperture positioned on the object side of the optical axis and outside the lens group. The optical lens of claim 8, wherein the lens group sequentially includes a first lens, a second lens, a third lens and a fourth lens from the image side to the object side, and the lens The refractive power of the first lens to the fourth lens is sequentially negative positive and negative positive, negative negative positive or negative positive positive. The optical lens of claim 9, wherein the lens group further comprises a first a fifth lens disposed between the three lens and the fourth lens, and the refractive index of the lens group from the image side to the object side is positively positive or negative positive or positive positive and negative positive, and wherein the first The aperture is located between the third lens and the fourth lens or between the fourth lens and the fifth lens. The optical lens of claim 8, further comprising: an optical system frame for the lens group to be disposed thereon; a bottom plate having a first opening, the bottom plate being fixed to the optical system frame or Forming from the optical system frame; a cover plate having a second opening, the cover plate being at a distance from the bottom plate and being fixed to the bottom plate by a screw; and one or more aperture adjustment blades included in In the second aperture, the size of the second aperture is changed by adjusting the aperture adjustment blade, and the aperture adjustment blade is disposed between the cover plate and the bottom plate; wherein the lens group, the cover plate, and the aperture adjustment blade The bottom plate and the light transmissive plate are sequentially arranged along the image side to the object side. The optical lens of claim 1 or 8, wherein the optical lens satisfies the following relationship: 1.2 < (SL1 + SL2) / TTL < 2.5, wherein SL1 represents the optical axis, the first aperture to The distance of the imaging plane; SL2 represents the distance of the second aperture to the imaging plane on the optical axis; and the TTL indicates that on the optical axis, the object side surface of the lens closest to the object side of the lens group is The distance of the imaging plane. The optical lens of claim 1 or 8, wherein the second aperture is an aperture of an adjustable aperture, and the aperture of the first aperture is greater than or equal to the aperture when the aperture of the second aperture is adjusted to an active state. The second aperture.