JP2023094188A - Lens and electronic apparatus - Google Patents

Abstract

To provide a lens and an electronic apparatus that can solve the issue that it is difficult to reduce the size or the weight of an optical system when corresponding to a large sensor.SOLUTION: The present application discloses a lens and an electronic apparatus. The lens includes: diaphragms sequentially arranged along a direction of an optical axis from an object to an image; a first lens group having a positive refractive power as a whole, the first lens group including at least one first lens with a positive refractive power and at least one second lens with a negative refractive power; a second lens group having a negative refractive power as a whole; and a collapsible mechanism for controlling a distance on the optical axis between the first lens group and the second lens group to be within a predetermined range.SELECTED DRAWING: Figure 1

Description

The present application belongs to the technical field of photographic equipment, and more particularly relates to lenses and electronic equipment.

2. Description of the Related Art In recent years, an imaging device mounted on a mobile information terminal has come to use a large-sized imaging element in order to obtain a higher quality image. Therefore, miniaturization and weight reduction of the imaging lens have become major issues.

However, according to the conventional proposal, the size of the lens in the imaging device increases as the size of the sensor increases. That is, in the conventional proposals, it was difficult to reduce the size and weight of the optical system when dealing with a large sensor.

An object of the embodiments of the present application is to provide a lens and an electronic device that solve the problem that it is difficult to reduce the size and weight of an optical system when dealing with a large sensor.

A first aspect of embodiments of the present application provides a lens. The lens includes a diaphragm arranged in order along the optical axis direction from the object side to the image side, and a first lens having positive refractive power as a whole and one or more first lenses having positive refractive power. A first lens group including a second lens having a negative refractive power and a second lens group having a negative refractive power as a whole, and on the optical axis of the first lens group and the second lens group It further includes a collapsible mechanism for controlling the distance of the to within a predetermined range.

A second aspect of the embodiments of the present application provides an electronic device comprising a lens according to the first aspect.

In the embodiments of the present application, a first lens group having positive refractive power as a whole and a second lens group having negative refractive power as a whole are provided, and the distance between the first lens group and the second lens group is set to By changing the chief ray incident angle CRA (Chief Ray Angle) by controlling it within a predetermined range with a collapsible mechanism, the diameter of the first lens group can be reduced while supporting a large sensor, thereby reducing the size and weight of the optical system. is realized.

FIG. 1 is a schematic configuration diagram of a lens according to an embodiment of the present application. FIG. 2a illustrates a scenario in which a chief ray is refracted by the lens in a conventional lens. FIG. 2b illustrates a scenario in which the chief ray is refracted by the lens in a lens according to an embodiment of the present application; FIG. 3 is a diagram showing the numbering of each optical surface of a lens according to an embodiment of the present application; 4a, 4b are schematic diagrams of Example 1 of a lens according to embodiments of the present application. 4a, 4b are schematic diagrams of Example 1 of a lens according to embodiments of the present application. 5a, 5b are schematic diagrams of Example 2 of a lens according to embodiments of the present application. 5a, 5b are schematic diagrams of Example 2 of a lens according to embodiments of the present application. 6a and 6b are schematic diagrams of Example 3 of a lens according to embodiments of the present application. 6a and 6b are schematic diagrams of Example 3 of a lens according to embodiments of the present application. 7a, 7b are schematic diagrams of Example 4 of a lens according to embodiments of the present application. 7a, 7b are schematic diagrams of Example 4 of a lens according to embodiments of the present application. 8a and 8b are schematic diagrams of Example 5 of a lens according to embodiments of the present application. 8a and 8b are schematic diagrams of Example 5 of a lens according to embodiments of the present application. Figures 9a and 9b are schematic diagrams of Example 6 of a lens according to embodiments of the present application. Figures 9a and 9b are schematic diagrams of Example 6 of a lens according to embodiments of the present application. 10a, 10b are schematic diagrams of Example 7 of a lens according to embodiments of the present application. 10a, 10b are schematic diagrams of Example 7 of a lens according to embodiments of the present application. 11a, 11b are schematic diagrams of Example 8 of a lens according to embodiments of the present application. 11a, 11b are schematic diagrams of Example 8 of a lens according to embodiments of the present application. 12a, 12b are schematic diagrams of Example 9 of a lens according to embodiments of the present application. 12a, 12b are schematic diagrams of Example 9 of a lens according to embodiments of the present application. 13a and 13b are schematic diagrams of Example 10 of a lens according to embodiments of the present application. 13a and 13b are schematic diagrams of Example 10 of a lens according to embodiments of the present application. 14a, 14b are schematic diagrams of Example 11 of a lens according to embodiments of the present application. 14a, 14b are schematic diagrams of Example 11 of a lens according to embodiments of the present application. 15a and 15b are schematic diagrams of Example 12 of a lens according to embodiments of the present application. 15a and 15b are schematic diagrams of Example 12 of a lens according to embodiments of the present application.

The technical solutions in the embodiments of the present application are clearly and completely described together with the drawings in the embodiments of the present application. Apparently, the described embodiments are some but not all embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by persons skilled in the art without creative efforts shall fall within the protection scope of the present application.

The terms "first", "second", etc. in the specification and claims of this application are not used to describe a particular order or order, but to distinguish between similar objects. used. The data used in this manner may be interchanged, where appropriate, and the terms "first", "second", etc. may be used to allow embodiments of the present application to be practiced in orders other than that illustrated or described herein. It should be understood that the objects distinguished by are generally cognate and the number of objects is not limited, for example, the first object may be one or more. Also, "and/or" in the specification and claims indicates at least one connected object, and "/" usually indicates an "or" relationship between related objects before and after.

Hereinafter, the lenses according to the embodiments of the present application will be described in detail through specific embodiments and their application scenarios with reference to the drawings.

As shown in FIG. 1, the lens according to the embodiment of the present application includes a diaphragm 1 arranged in order from the object side (left side in FIG. 1) to the image side (right side in FIG. 1) along the optical axis direction; It includes a lens group 2 and a second lens group 3 . Here, the diaphragm means a real object that acts to limit the light beam in the optical system, and the effect limits the light beam or limits the size of the field of view (or imaging range). The stop may be an edge of an optical lens, a frame of an optical lens, a lens barrel, an aperture stop, or the like. The diaphragm has a light-passing area. This is a property of the diaphragm itself, and every diaphragm has a light passage area.

The first lens group 2 includes at least one first lens 21 having positive refractive power and at least one second lens having negative refractive power. The first lens group 2 has positive refractive power as a whole, and the second lens group 3 has negative refractive power as a whole.

The position of the second lens group 3 is fixed to that of the optical sensor 4 in the equipment by a specific assembly method. Correspondingly, the first lens group 2 is controlled to actually move when the lens is retracted, and the distance between the first lens group 2 and the second lens group 3 is changed. The embodiments of the present application do not limit the method of assembling the second lens group 3 .

The lens further includes a retraction mechanism (not shown) that controls the distance on the optical axis between the first lens group 2 and the second lens group 3 within a predetermined range. The embodiments of the present application do not limit the specific configuration of the collapsible mechanism.

In the embodiments of the present application, a first lens group having positive refractive power as a whole and a second lens group having negative refractive power as a whole are provided, and the distance between the first lens group and the second lens group is set to By changing the principal ray incident angle CRA by controlling it within a predetermined range using a collapsible mechanism, the diameter of the first lens group can be reduced while supporting a large sensor, and the size and weight of the optical system can be reduced. .

Specifically, refer to FIGS. 2a and 2b. FIG. 2a shows a scenario in which the chief ray is refracted by the lens in a conventional lens, and FIG. 2b shows a scenario in which the chief ray is refracted by the lens in a lens according to embodiments of the present application. Comparing FIG. 2a and FIG. 2b, it can be seen that by using the lens according to the embodiments of the present application, the CRA can be increased, and a larger size sensor can be applied for the same size lens. With respect to sensors of the same size, the lenses according to the embodiments of the present application can be made smaller in size, so that the size and weight of the lenses can be reduced while supporting large sensors. I know you can.

Continuing to refer to FIG. 1, in a possible embodiment, the second lens group 3 includes a planar substrate 31 having an infrared IR (Infrared Radiation) cut function, and a concave surface provided on the planar substrate 31 facing the object side. and lens 32 . In this way, since the arrangement of the IR cut filter can be omitted, the internal space of the device can be saved.

In order for the second lens group to effectively correct the curvature of field of the first lens group, the height of the off-axis principal ray in the second lens group must be as high as possible. Therefore, in the present application, the second lens group is fixed near the sensor surface. In this case, if the size of the sensor increases, the lens diameter of the second lens group increases, making general injection molding difficult. As a countermeasure against this, an optical element in which a lens portion is formed on a glass substrate, which is a parallel flat plate, will be described as an example. For example, by forming a plurality of lens portions on the front surface of a flat lens substrate and leaving the rear surface of the lens substrate as it is, or by cutting out the lens portions after forming the lens portions on the rear surface in a similar manner, a plurality of lens portions can be obtained. of lens blocks can be obtained at once. In particular, when one side of the lens substrate is left as it is, the high flatness of the lens substrate can be utilized, and the manufacturing difficulty can be reduced.

In addition, providing the flat portion with an infrared IR (Infrared Radiation) cut function contributes to miniaturization.

Furthermore, the use of a glass substrate for the second lens group makes it resistant to temperature changes, and the plastic lens formed on the substrate is also placed close to the sensor surface, which reduces the height of paraxial rays. , the power fluctuation of the second lens group due to temperature change has little effect on aberration and back focus.

The second lens group can be used not only for correction of various aberrations, but also as a correction lens for various purposes such as CRA adjustment and peripheral light amount improvement.

In a possible embodiment, the predetermined range satisfies 0.14<DG12/OAL<0.60 (hereinafter referred to as condition (1)). However, DG12 is the distance on the optical axis between the first lens group and the second lens group, and OAL is the distance on the optical axis from the object side surface of the first lens group to the image side surface of the second lens group. .

In a possible embodiment, the first lens group and the second lens group satisfy 0.6<(TL1+TL2)/MIH<1.65 (hereinafter referred to as condition (2)). However, TL1 is the thickness in the direction parallel to the optical axis from the object side surface to the image side surface within the effective diameter of the first lens group, and TL2 is the thickness from the object side surface to the image side surface within the effective diameter of the second lens group. is the thickness in the direction parallel to the optical axis, and MIH is the maximum image height.

In a possible embodiment, the first lens group satisfies 0.13<(MIH-MSDG1)/f<0.70 (hereinafter referred to as condition (3)). However, MIH is the maximum image height, MSDG1 is the maximum effective radius of the first lens group, and f is the focal length of the entire lens system.

Conditions (1) to (3) are countermeasures against an increase in optical size due to an increase in sensor size.

By maintaining an appropriate distance (DG12) between the first lens group and the second lens group within the range of condition (1), it is possible to drive the first lens group during AF (automatic focus) and OIS (optical image stabilization) while ensuring performance. It is possible to reduce the size (reduction in diameter) and weight of one lens group.

In addition, in response to the increase in the total optical length due to the widening of the distance between the first lens group and the second lens group, the first lens group pops up when the lens is in use, and the first lens group and the second lens group when the lens is retracted. Compactness in the thickness direction is achieved by attaching a collapsible mechanism that shortens the distance between groups. At this time, by satisfying the range of condition (2), even if the sensor size increases, it is possible to reduce the thickness of the entire imaging device while maintaining performance.

Condition (3) relates to reducing the diameter of the first lens group. By satisfying this range, even if the sensor size increases, the first lens group to be driven does not increase in size, and a reduction in diameter and weight can be achieved at the same time.

By dividing the first lens group and the second lens group in this way, it is possible to reduce the overall size of the imaging apparatus. By dividing into the negative second lens group fixed to , the AF movement amount and the OIS driving amount become smaller than those of the conventional lens. Therefore, it is possible to suppress an increase in the driving amount of AF and OIS due to the enlargement of the sensor.

Since the second lens group plays a role of correcting the image plane, it is possible to prevent deterioration of close-range performance (tilt of the image plane) due to an increase in size of the sensor.

In a possible embodiment, the first lens group and the second lens group satisfy −2.8<FG2/FG1<−0.7 (hereinafter referred to as condition (4)). However, FG1 is the focal length of the first lens group, and FG2 is the focal length of the second lens group.

In a possible embodiment, the first lens and the second lens group satisfy −3.0<FG2/f1<−0.6 (hereinafter referred to as condition (5)). However, f1 is the focal length of the first lens, and FG2 is the focal length of the second lens group.

Conditions (4) and (5) are conditions for obtaining a high-performance lens compatible with a large sensor.

The first lens group mainly functions for image formation, and the second lens group functions for image plane correction. By satisfying the condition (4), the balance between the focal lengths of the first lens group and the second lens group can be appropriately maintained, and good performance can be ensured.

In lenses for large sensors, the balance between axial chromatic aberration and chromatic aberration of magnification tends to be lost, and it is required to correct chromatic aberration appropriately. The first lens in the first lens group is deeply involved in correction of chromatic aberration, and tends to have high error sensitivity. By satisfying condition (5), off-axis and on-axis performances corresponding to large sensors can be corrected in a well-balanced manner, leading to suppression of error sensitivity.

In a possible embodiment, the first lens group and the second lens group satisfy 3.5<|CRAG2-CRAS|max<19.5 (hereinafter referred to as condition (6)). where CRAG2 is the angle of the principal ray incident on the second lens group, CRAS is the angle of the principal ray incident on the optical sensor, and |CRAG2-CRAS|max is the angle of CRAGS2 and CRAS at each image height. It is the maximum value among the absolute values of the differences.

Condition (6) relates to the adjustment of CRA. By satisfying this range, it is possible to reduce the diameter of the first lens group while appropriately maintaining the angle of incidence on the sensor surface. In other words, the effective diameter of the first lens group can be kept small by appropriately increasing the angle of light rays incident on the second lens group from the first lens group. In this case, the aspheric surface of the second lens group is used to properly correct the CRA to the sensor.

Embodiments of the present application further provide an electronic device including a lens according to the embodiments of the present application above. Said electronic devices include mobile phones, Tablet Personal Computers, Laptop Computers or Notebook Computers, Personal Digital Assistants PDA, Palmtop Computers, Netbooks, Ultra Mobile Personal Computers UMPCs (ultra -mobile personal computer), mobile internet device MID (Mobile Internet Device), robot, in-vehicle equipment (VUE), pedestrian terminal (PUE), wearable device (Wearable Device) game machine, and the like. Wearable devices include smart watches, smart rings, smart earbuds, smart glasses, smart accessories (smart hand bracelets, smart hand chain bracelets, smart rings, smart necklaces, smart foot bracelets, smart foot chain bracelets, etc.), smart wristbands, smart Including clothing. Embodiments of the present application do not limit specific categories of electronic devices.

ただし、Ａｉは、ｉ次の非球面係数であり、Ｒは、曲率半径であり、Ｋは、円錐定数である。 Specific examples of the lens of the present application will be described below. The shape of the aspherical surface is represented by the following formula, with the vertex of the surface as the origin, the X axis in the optical axis direction, and the height in the direction perpendicular to the optical axis as h.

where Ai is the i-th order aspheric coefficient, R is the radius of curvature, and K is the conic constant.

It should be noted that surface numbers according to the following examples are assigned with reference to the aspect shown in FIG. Each alphabet according to the following examples has the following meaning.
f: Focal length of the entire imaging lens system Fno: F-number HFOV: Half angle of view MIH: Maximum image height of the imaging lens R: Radius of curvature D: Distance between upper surfaces of the axis Nd: Refractive index of the lens material for the d-line νd: Lens material Abbe number.

Example 1
Lens data are shown in Table 1.

Aspheric coefficients are shown in Table 2.

A cross-sectional view of the lens of this example is shown in FIG. 4a, and astigmatism (mm) and distortion (%) are shown in FIG. 4b. In the astigmatism diagram, the solid line represents the sagittal image plane, and the dotted line represents the tangential image plane. From each aberration chart, it is clear that various aberrations are well corrected and that the lens has excellent imaging performance.

Example 2
Lens data are shown in Table 3.

Aspheric coefficients are shown in Table 4.

A cross-sectional view of the lens of this example is shown in FIG. 5a, and astigmatism (mm) and distortion (%) are shown in FIG. 5b. In the astigmatism diagram, the solid line represents the sagittal image plane, and the dotted line represents the tangential image plane. From each aberration chart, it is clear that various aberrations are well corrected and that the lens has excellent imaging performance.

Example 3
Lens data are shown in Table 5.

Aspheric coefficients are shown in Table 6.

A cross-sectional view of the lens of this example is shown in FIG. 6a, and astigmatism (mm) and distortion (%) are shown in FIG. 6b. In the astigmatism diagram, the solid line represents the sagittal image plane, and the dotted line represents the tangential image plane. From each aberration chart, it is clear that various aberrations are well corrected and that the lens has excellent imaging performance.

Example 4
Lens data are shown in Table 7.

Aspheric coefficients are shown in Table 8.

A cross-sectional view of the lens of this example is shown in FIG. 7a, and astigmatism (mm) and distortion (%) are shown in FIG. 7b. In the astigmatism diagram, the solid line represents the sagittal image plane, and the dotted line represents the tangential image plane. From each aberration chart, it is clear that various aberrations are well corrected and that the lens has excellent imaging performance.

Example 5
Lens data are shown in Table 9.

Aspheric coefficients are shown in Table 10.

A cross-sectional view of the lens of this example is shown in FIG. 8a, and astigmatism (mm) and distortion (%) are shown in FIG. 8b. In the astigmatism diagram, the solid line represents the sagittal image plane, and the dotted line represents the tangential image plane. From each aberration chart, it is clear that various aberrations are well corrected and that the lens has excellent imaging performance.

Example 6
Lens data are shown in Table 11.

Aspheric coefficients are shown in Table 12.

A cross-sectional view of the lens of this example is shown in FIG. 9a, and astigmatism (mm) and distortion (%) are shown in FIG. 9b. In the astigmatism diagram, the solid line represents the sagittal image plane, and the dotted line represents the tangential image plane. From each aberration chart, it is clear that various aberrations are well corrected and that the lens has excellent imaging performance.

Example 7
Lens data are shown in Table 13.

Aspheric coefficients are shown in Table 14.

A cross-sectional view of the lens of this example is shown in FIG. 10a, and astigmatism (mm) and distortion (%) are shown in FIG. 10b. In the astigmatism diagram, the solid line represents the sagittal image plane, and the dotted line represents the tangential image plane. From each aberration chart, it is clear that various aberrations are well corrected and that the lens has excellent imaging performance.

Example 8
Lens data are shown in Table 15.

Aspheric coefficients are shown in Table 16.

A cross-sectional view of the lens of this example is shown in FIG. 11a, and astigmatism (mm) and distortion (%) are shown in FIG. 11b. In the astigmatism diagram, the solid line represents the sagittal image plane, and the dotted line represents the tangential image plane. From each aberration chart, it is clear that various aberrations are well corrected and that the lens has excellent imaging performance.

Considering the difficulty of manufacturing technology for forming lenses on a substrate having an IR cut function, Examples 9, 10, and 11 are examples in which the IR cut filter is not omitted.

Example 9
Lens data are shown in Table 17.

Aspheric coefficients are shown in Table 18.

A cross-sectional view of the lens of this example is shown in FIG. 12a, and astigmatism (mm) and distortion (%) are shown in FIG. 12b. In the astigmatism diagram, the solid line represents the sagittal image plane, and the dotted line represents the tangential image plane. From each aberration chart, it is clear that various aberrations are well corrected and that the lens has excellent imaging performance.

Example 10
Lens data are shown in Table 19.

Aspheric coefficients are shown in Table 20.

A cross-sectional view of the lens of this example is shown in FIG. 13a, and astigmatism (mm) and distortion (%) are shown in FIG. 13b. In the astigmatism diagram, the solid line represents the sagittal image plane, and the dotted line represents the tangential image plane. From each aberration chart, it is clear that various aberrations are well corrected and that the lens has excellent imaging performance.

Example 11
Lens data are shown in Table 21.

Aspheric coefficients are shown in Table 22.

A cross-sectional view of the lens of this example is shown in FIG. 14a, and astigmatism (mm) and distortion (%) are shown in FIG. 14b. In the astigmatism diagram, the solid line represents the sagittal image plane, and the dotted line represents the tangential image plane. From each aberration chart, it is clear that various aberrations are well corrected and that the lens has excellent imaging performance.

Example 12
Lens data are shown in Table 23.

Aspheric coefficients are shown in Table 24.

A cross-sectional view of the lens of this example is shown in FIG. 15a, and astigmatism (mm) and distortion (%) are shown in FIG. 15b. In the astigmatism diagram, the solid line represents the sagittal image plane, and the dotted line represents the tangential image plane. From each aberration chart, it is clear that various aberrations are well corrected and that the lens has excellent imaging performance.

各実施例の条件（１）～（６）に対応する値

Example summary:
Overall specifications of each embodiment

Values corresponding to conditions (1) to (6) in each example

As shown in the examples, it is possible to achieve a compact and lightweight bright high-performance lens with an F number of 1.95 or less in a large sensor with a sensor size of 1/1.5 or more (maximum image height of 5.34 mm). did it.

Although the examples of the present application have been described above with reference to the drawings, the present application is not limited to the specific embodiments described above. The specific embodiments described above are exemplary only and are not limiting. A person skilled in the art can take inspiration from this application and make many configurations that fall within the scope of protection of this application without departing from the spirit and scope of the claims of this application.

Claims (9)

A diaphragm arranged in order along the optical axis direction from the object side to the image side; A first lens group including a second lens having refractive power, and a second lens group having negative refractive power as a whole,
The lens, further comprising a collapsible mechanism for controlling the distance on the optical axis between the first lens group and the second lens group within a predetermined range. 2. The lens according to claim 1, wherein the second lens group includes a planar substrate having an infrared IR cut function, and a concave lens provided on the planar substrate and having a concave surface facing the object side. The predetermined range is 0.14<DG12/OAL<0.60 (where DG12 is the distance on the optical axis between the first lens group and the second lens group, and OAL is the first 2. The lens according to claim 1, wherein the distance on the optical axis from the object side surface of the lens group to the image side surface of the second lens group is satisfied. 0.6<(TL1+TL2)/MIH<1.65 (where TL1 is the distance from the object side surface to the image side surface within the effective diameter of the first lens group). TL2 is the thickness in the direction parallel to the optical axis, the TL2 is the thickness in the direction parallel to the optical axis from the object side surface to the image side surface within the effective diameter of the second lens group, and the MIH is the maximum image height). The first lens group is 0.13<(MIH−MSDG1)/f<0.70 (where the MIH is the maximum image height and the MSDG1 is the maximum effective radius of the first lens group. , and f is the focal length of the entire lens system. The first lens group and the second lens group are -2.8<FG2/FG1<-0.7 (where FG1 is the focal length of the first lens group, and FG2 is the focal length of the first lens group). 2. The lens according to claim 1, wherein the focal length of the two lens groups is satisfied. The first lens and the second lens group are -3.0<FG2/f1<-0.6 (where f1 is the focal length of the first lens, and FG2 is the second lens 2. The lens according to claim 1, wherein the focal length of the group is satisfied. The first lens group and the second lens group are 3.5<|CRAGS2−CRAS|max<19.5 (wherein CRAGS2 is the angle of the principal ray incident on the second lens group, and the CRAS is the angle of the principal ray incident on the optical sensor, and |CRAG2-CRAS|max is the maximum absolute value of the difference between CRAG2 and CRAS at each image height.) 2. The lens of claim 1, wherein: An electronic device comprising the lens according to any one of claims 1 to 8.

Images