CN116209938A - optical device - Google Patents

Abstract

There is provided an optical device comprising: a lens group (11, 101, 102, 103, 104, 105, 106) including a plurality of lenses (L1, L2, L3, L4); a moving unit (120) configured to move the plurality of lenses (L1, L2, L3, L4); and a control unit (14) configured to control the moving unit (120) to change between a closed position state in which the plurality of lenses (L1, L2, L3, L4) are closest to each other so as to operate like one lens, and an open position state in which the plurality of lenses (L1, L2, L3, L4) are placed apart from each other.

Description

optical device

technical field

The present disclosure relates to an optical device, an apparatus and a method for controlling the refractive power of a lens group in the optical device. For example, the device may be a mobile device such as a cell phone, smartphone, tablet or PC. Alternatively, the device may be a digital still camera, digital video camera, security/surveillance camera, webcam, automotive/transportation camera, medical camera, etc.

Background technique

Generally, as a method of realizing a zoom function and a focus function in an imaging device, there is a method of changing the refractive power of a lens group including a plurality of lenses by moving the lenses relative to each other. Another known method is to change the refractive power by changing and controlling the curvature of a single lens using a liquid lens.

On the other hand, the miniaturization of imaging devices will contribute to the miniaturization of mobile devices equipped with imaging functions, such as smartphones, mobile phones, tablets, and driving recorders. Miniaturization also contributes to the miniaturization of imaging devices such as network cameras, action cameras, surveillance cameras and small digital video cameras. Furthermore, it is also possible to miniaturize the imaging device by suppressing an increase in the size of the entire lens group forming the imaging lens.

The present disclosure can change the distribution of refractive power while suppressing an increase in the size of the lens group.

Contents of the invention

Under the above circumstances, the embodiments disclosed below provide technical advantages. Embodiments provide an optical device, an apparatus, and a method for controlling the refractive power of a lens group in the optical device. The device can be a cell phone, smartphone, tablet, PC, digital still camera, digital video camera, security/surveillance camera, web camera, automotive/transportation camera, medical camera, etc.

A first aspect of embodiments provides an optical device.

In a first possible implementation manner of the first aspect, the optical device includes: a lens group including a plurality of lenses; a moving unit configured to move the plurality of lenses; and a control unit configured to control the moving unit to close Changing between a closed position state, in which the multiple lenses are closest together so as to work as one lens, and an open position state, in which the multiple lenses are placed apart from each other. According to a first embodiment of the first aspect, the optical power of the lens group is changeable between a first optical power corresponding to the closed position state and a second optical power corresponding to the open position state.

A second possible implementation of the first aspect provides: the device according to the first possible implementation of the first aspect.

wherein the plurality of lenses in the closed position state are configured to satisfy the condition provided by the following equation (1):

D _min /φ < 0.2 (1),

Wherein, D _min indicates the distance between two adjacent lenses of the lens group, and φ indicates the optical effective diameter of the lens with the largest lens diameter in the lens group. Alternatively, the plurality of lenses in the closed position state may satisfy the following condition provided by the following equation (1a):

D _min /φ<0.1 (1a).

A third possible implementation of the first aspect provides: the device according to the first or second possible implementation of the first aspect, wherein the plurality of lenses include aspheric first lenses and second aspherical lenses facing each other A lens, wherein the image side of the first lens and the object side of the second lens facing the image side of the first lens have shapes represented by the following equations (2) and (3):

0.5 < abs[S _ob (h)/S _im (h)] < 2.0 (2),

where S _ob (h) indicates the sagamount of the object side of the second lens at a height h from the optical axis, S _im (h) indicates the sagamount of the image side of the first lens at a height h, and

0.7 < R _ob / R _im < 1.3 (3),

Wherein, R _ob indicates the radius of curvature of the object side of the second lens, and R _im indicates the radius of curvature of the image side of the first lens.

Alternatively, the image side of the first lens and the object side of the second lens facing the image side of the first lens may have shapes represented by the following equations (2a) and (3a):

0.7<abs[S _ob (h)/S _im (h)]<1.8(2a), and

0.8<R _ob /R _im <1.2 (3a).

Alternatively, the image side of the first lens and the object side of the second lens facing the image side of the first lens may have a shape represented by the following equation (3b):

0.7<abs[S _ob (h)/S _im (h)]<1.6(3b).

A second aspect of embodiments provides an apparatus.

In a first possible implementation of the second aspect, the apparatus comprises: optical means, an image sensor receiving light passing through the optical means, and a processor for generating image data based on an output signal from the image sensor, wherein The optical device includes: a lens group including a plurality of lenses; a moving unit configured to move the plurality of lenses; and a control unit configured to control the moving unit to change between a closed position state and an open position state, in the closed position state , the lenses are closest together to work as one lens, and in the open position, the lenses are placed apart from each other. According to a first embodiment of the first aspect, the optical power of the lens group is changeable between a first optical power corresponding to the closed position state and a second optical power corresponding to the open position state.

A second possible implementation of the second aspect provides: the device according to the first possible implementation of the second aspect, wherein the plurality of lenses in the closed position state are configured to satisfy the given by the following equation (1) condition:

D _min /φ < 0.2 (1),

Wherein, D _min indicates the distance between two adjacent lenses of the lens group, and φ indicates the optical effective diameter of the lens with the largest lens diameter in the lens group. Alternatively, the plurality of lenses in the closed position state may satisfy the following condition provided by the following equation (1a):

D _min /φ<0.1 (1a).

A third possible implementation form of the second aspect provides: the device according to the first or second possible implementation form of the second aspect, wherein the plurality of lenses include aspheric first lenses and second aspherical lenses facing each other A lens, wherein the image side of the first lens and the object side of the second lens facing the image side of the first lens have shapes represented by the following equations (2) and (3):

0.5 < abs[S _ob (h)/S _im (h)] < 2.0 (2),

where S _ob (h) indicates the amount of sag of the object side of the second lens at a height h from the optical axis, S _im (h) indicates the amount of sag of the image side of the first lens at a height h, and

0.7 < R _ob / R _im < 1.3 (3),

Wherein, R _ob indicates the radius of curvature of the object side of the second lens, and R _im indicates the radius of curvature of the image side of the first lens.

Alternatively, the image side of the first lens and the object side of the second lens facing the image side of the first lens may have shapes represented by the following equations (2a) and (3a):

0.7<abs[S _ob (h)/S _im (h)]<1.8(2a), and

0.8<R _ob /R _im <1.2 (3a).

Alternatively, the image side of the first lens and the object side of the second lens facing the image side of the first lens may have a shape represented by the following equation (3b):

0.7<abs[S _ob (h)/S _im (h)]<1.6(3b).

A third aspect of embodiments provides a method. In a first possible implementation of the third aspect, a method for controlling the refractive power of a lens group comprising a plurality of lenses, the method comprising: an actuator moving the plurality of lenses between a closed position state and an open position state Change, in the closed position state, multiple lenses are closest to work as one lens, in the open position state, multiple lenses are placed apart from each other. According to a first implementation form of the third aspect, the optical power of the lens group is changeable between a first optical power corresponding to the closed position state and a second optical power corresponding to the open position state.

A second possible implementation of the second aspect provides the method according to the first possible implementation of the third aspect, wherein the plurality of lenses in the closed position state are configured to satisfy the given by the following equation (1) condition:

D _min /φ < 0.2 (1),

Wherein, D _min indicates the distance between two adjacent lenses of the lens group, and φ indicates the optical effective diameter of the lens with the largest lens diameter in the lens group. Alternatively, the plurality of lenses in the closed position state may satisfy the following condition provided by the following equation (1a):

D _min /φ<0.1 (1a).

A fourth aspect of the embodiments provides a non-transitory computer-readable storage medium storing a program for causing a processor to execute the method according to the first or second possible implementation manner of the third aspect. A fifth aspect of the embodiments provides a computer-readable program, which causes a processor to execute the method according to the first or second possible implementation manner of the third aspect.

Description of drawings

1 is an external view showing an example of a hardware configuration of a mobile device in which an imaging lens group according to each of the first to sixth embodiments can be implemented;

Fig. 2 is a sectional view showing a section along line II-II in Fig. 1;

3 is a block diagram showing an example of a hardware configuration of a mobile device in which the imaging lens group according to each of the first to sixth embodiments can be implemented;

4A is a configuration diagram showing an example of an imaging lens group according to the first embodiment, and FIG. 4B is a table showing focal lengths of respective lenses constituting the imaging lens group according to the first embodiment and conditions satisfied by the lenses;

5 is a table showing lens parameters of the respective lenses constituting the imaging lens group according to the first embodiment;

6A is a configuration diagram showing an example of an imaging lens group according to the second embodiment, and FIG. 6B is a table showing focal lengths of respective lenses constituting the imaging lens group according to the second embodiment and conditions satisfied by the lenses;

7 is a table showing lens parameters of the respective lenses constituting the imaging lens group according to the second embodiment;

8A is a configuration diagram showing an example of an imaging lens group according to the third embodiment, and FIG. 8B is a table showing focal lengths of respective lenses constituting the imaging lens group according to the third embodiment and conditions satisfied by the lenses;

9 is a table showing lens parameters of the respective lenses constituting the imaging lens group according to the third embodiment;

10A is a configuration diagram showing an example of an imaging lens group according to a fourth embodiment, and FIG. 10B is a table showing focal lengths of respective lenses constituting the imaging lens group according to the fourth embodiment and conditions satisfied by the lenses;

11 is a table showing lens parameters of the respective lenses constituting the imaging lens group according to the fourth embodiment;

12A is a configuration diagram showing an example of an imaging lens group according to the fifth embodiment, and FIG. 12B is a table showing focal lengths of respective lenses constituting the imaging lens group according to the fifth embodiment and conditions satisfied by the lenses;

13 is a table showing lens parameters of the respective lenses constituting the imaging lens group according to the fifth embodiment;

14A is a configuration diagram showing an example of an imaging lens group according to the sixth embodiment, and FIG. 14B is a table showing focal lengths of respective lenses constituting the imaging lens group according to the sixth embodiment and conditions satisfied by the lenses;

15 is a table showing lens parameters of the respective lenses constituting the imaging lens group according to the sixth embodiment;

FIG. 16 is a table showing lens data of the respective lenses constituting the imaging lens group according to the embodiments.

Detailed ways

The technical solutions of the embodiments will be described below with reference to the accompanying drawings. Apparently, the embodiments described below are not all the embodiments of the present disclosure, but only a part of the embodiments of the present disclosure. It should be noted that all other embodiments obtained by those skilled in the art based on the embodiments described below without creative efforts belong to the protection scope of the embodiments of the present disclosure.

First, a configuration example of a mobile device in which the imaging lens group according to each embodiment can be realized will be described first, and then the imaging lens groups according to the first embodiment, second embodiment, third embodiment, fourth embodiment, fifth embodiment will be described in order. Configuration examples of the imaging lens groups of the embodiment and the sixth embodiment, and characteristics of these imaging lenses.

(example implementation on mobile)

A mobile device 10 in which one of imaging lens groups 101 , 102 , 103 , 104 , 105 , and 106 according to first to sixth embodiments described below will be described with reference to FIGS. 1 to 3 . The mobile device 10 shown in FIGS. 1 and 2 is a smartphone, but is not limiting. The mobile device 10 is an example of a device according to one embodiment of the present disclosure. For example, the device may be a cell phone, smartphone, tablet, personal computer, digital still camera, digital video camera, security/surveillance camera, web camera, automotive/transportation camera, medical camera, etc.

FIG. 1 is a perspective view showing an external configuration of a smartphone 10 on which the imaging lens group according to each of the first to sixth embodiments can be mounted. In this configuration example, the smartphone includes three imaging units 31 , 32 and 33 . It should be noted that FIG. 1 shows only the respective openings of the three imaging units arranged in the housing member 20 of the smartphone 10 .

FIG. 2 is a sectional view showing a section along line II-II in FIG. 1 . As shown in FIG. 2, the imaging unit 31 of the smartphone 10 includes a main lens 15 forming an opening of the imaging unit 31, an imaging lens group (lens unit) 11 according to any one of the first to sixth embodiments described below. , and the imaging device 16. When imaging, light entering through the main lens 15 as an opening passes through the respective elements in the order described above and reaches the imaging device 16 . In addition, the imaging unit 31 includes a moving unit 120 for moving the lens group for the imaging lens group 11 , which will be described in part of each embodiment below. The moving unit 120 includes the actuator 12 ( FIG. 3 ) as its driving source.

The imaging device 16 includes an imaging element 170 such as a CCD or CMOS, and an AD conversion circuit (not shown) that converts an analog electric signal output from the imaging element into a digital image signal.

The imaging element 170 of the imaging device 16 is arranged at the position of the image plane. The imaging element has a plurality of pixels. For example, the imaging element includes pixels that generate electrical signals corresponding to the intensity of the red light component, pixels that generate electrical signals corresponding to the intensity of the blue light component, and pixels that generate electrical signals corresponding to the intensity of the green light component. As a modification, the imaging element may be another imaging element for monochrome photography that includes a plurality of pixels that generate electrical signals corresponding to the intensity of light.

3 is a block diagram showing an example of the hardware configuration of the smartphone 10 in which the imaging lens according to each of the first to sixth embodiments can be mounted, and mainly shows a control configuration associated with the imaging unit 31 .

As shown in FIG. 3 , the control configuration of the smartphone 10 includes an actuator 12 , a driver 13 and a CPU 14 .

The CPU 14 executes a program stored in a memory (not shown) to control the movement of the lenses in the lens groups in the first to sixth embodiments described below. Specifically, the CPU 14 controls the driving of the actuator 12 via the driver 13 , thereby controlling the movement of each lens in the imaging lens group 11 . The actuator 12 and the driver 13 may be an example of a moving unit according to an embodiment of the present disclosure, and the CPU 14 may be an example of a control unit according to an embodiment of the present disclosure. In addition, a set of imaging lens group 11, actuator 12, and driver 13 may be an example of an optical device according to an embodiment of the present disclosure. The above configuration makes it possible to move and arrange the lenses in the lens group of each embodiment described below.

First to sixth embodiments of the imaging lens group 11 in the smartphone 10 will be described below.

(first embodiment)

4A and 4B are diagrams showing the imaging lens group 101 of the first embodiment of the present disclosure, which can be mounted as the imaging lens group 11 shown in the configuration example of the smartphone 10 . 4A shows the lens positions of the imaging lens group 101 in the closed position and the open position, respectively, and FIG. 4B shows a table showing the focal lengths and the like of the imaging lens group 101 in the closed position and the open position.

As shown in FIG. 4A , the imaging lens group 101 of the present embodiment includes three lenses L1 to L3 . In addition, AX represents an optical axis, and S1 , S2 , S3 , S4 , S5 , and S6 represent surfaces of lenses L1 to L3 , respectively. For the imaging lens group 101 , the closed position is a position where the respective lenses are close to each other, and conditional expressions (1) to (3) described later are satisfied. The open position is a position where the respective lenses of the imaging lens group 101 are separated from each other to achieve a predetermined refractive power. This makes it possible to reverse the positive and negative powers provided in the closed and open positions. Also, for example, the opening position may be determined to achieve a refractive power corresponding to the zoom and focus functions of the imaging device. Therefore, in the system of one lens group, the combination of the distances D1 and D2 between the lenses described below with reference to FIG. multiple open positions.

In FIG. 4A , the lenses L1 , L2 and L3 of the imaging lens group 101 are arranged sequentially from the object side on the left side in FIG. 4A to the image side on the right side in FIG. 4A . That is, the lens L1 is positioned closest to the object side, and the lens L3 is positioned closest to the image side.

As shown in FIG. 4A, surfaces S1 and S2 are aspherical surfaces to achieve predetermined optical characteristics. The shape of surfaces S1 and S2 allows lens L1 to have a positive refractive power.

Lens L2 is an aspheric lens. The shape of surfaces S3 and S4 allows lens L2 to have a negative refractive power.

The object side S5 of lens L3 is aspheric so that its shape approximates the shape of the image side S4 of lens L2 adjacent thereto in the closed position and achieves predetermined optical characteristics. The shape of surfaces S5 and S6 allows lens L3 to have a negative refractive power.

As shown in the table of FIG. 4B , the focal lengths of the lenses L1 , L2 and L3 of this embodiment are 22.8, -324.27 and -19.92, respectively. The total focal lengths of the entire imaging lens group 101 at the closed position and the open position are 29.14 and 23.94, respectively. The surface condition indicating the degree of approximation of the surface shapes of the lenses approaching each other at the closed position was 0.84 for S2/S3 and 1.04 for S4/S5. Similarly, the radius condition indicating the degree of approximation of the lens surface shapes approaching each other at the closed position is 1.19 for S2/S3 and 0.96 for S4/S5. The distance condition shown in FIG. 4B is a parameter in conditional expression (1) described later, and indicates the distance between the lenses when the lenses are closest to each other at the closed position. In the imaging lens group 101 of the present embodiment, the distance condition is 0.003.

In the closed position, lenses L1 , L2 , and L3 are close to each other and satisfy conditional expressions (1) to (3) described later. Then, in this state (positional relationship), the three lenses L1, L2, and L3 have the same refractive power as one lens in the entire lens group. On the other hand, the lenses L1, L2 and L3 are separated from each other in the open position. In this state (positional relationship), the lenses L1, L2, L3 have respective refractive powers, but the imaging lens group 101 as a whole has a different refractive power from that of the open position.

As described above, the lenses L1, L2, and L3 of the imaging lens group 101 are close to each other in the closed position, and the entire lens group has the same refractive power as that of a single lens. On the other hand, in the open position, the refractive powers of the individual lenses are combined so that the entire imaging lens group 101 has a different refractive power from that of the closed position. Then, since the lenses L1, L2, and L3 are set to the closed position and the open position in a positional (distance) relationship, a refractive power distribution can be generated according to the relationship.

Conditional expressions (1) to (3) that should be satisfied in order for the lenses L1 , L2 , and L3 of the imaging lens group 101 to produce the above-described refractive power distribution at the closed position will now be described.

The lenses L1, L2 and L3 of the imaging lens group 10 satisfy

D _min /φ<0.2 conditional expression (1),

where D _min is the lens distance between the respective lenses when the lenses L1, L2, and L3 are close to each other in the closed position, and φ is the optical effective diameter of the lens having the largest lens diameter among the lenses L1, L2, and L3 constituting the imaging lens group 101 . In this embodiment, the lens distance is the value given in the distance condition shown in FIG. 4B.

In addition, those lens surfaces of lenses L1, L2, and L3 facing each other have similar surface shapes satisfying the following conditional expression (2), where S _ob (h) is the surface shape of the object side at an arbitrary lens diameter height h ( sag), and S _im (h) is the surface shape (sag) of the image side. In this example, the surface shape has the values given in the surface conditions shown in FIG. 4B.

0.5<abs[S _ob (h)/S _im (h)]<2.0 conditional expression (2).

Radii of curvature R1 and R2, R3 and R4, and R5 and R6 of the lens surfaces facing each other satisfy the following conditional expressions, where R _ob is the radius of curvature of the object side facing the object, and R _im is the radius of curvature of the image side. In this embodiment, the radius of curvature has the value given in the radius condition shown in FIG. 4B.

0.7<R _ob /R _im <1.3 conditional expression (3).

More preferable conditions are provided below for conditional expressions (1) to (3).

In the conditional expression (1), when the value of D _min /φ becomes 0.2 or more, the refractive power of individual lenses starts to influence individually, and when each lens is in the closed position, it is difficult to approximately regard the entire lens group as single lens. Therefore, the variation difference between the power distribution of the refractive power at the closed position and the power distribution of the refractive power after the lens is separated becomes smaller, and the desired effect cannot be obtained. Therefore, conditional expression (1) is preferably:

D _min /φ<0.1 conditional expression (4).

In addition, when the lens surface shape does not satisfy conditional expressions (2) and (3), those lens surfaces of lenses L1, L2, and L3 facing each other are affected by their own refraction, making it difficult to Treat the entire lens group approximately as a single lens. Therefore, after the power distribution of the refractive power in the closed position is separated from the lens, the change difference of the power distribution of the refractive power becomes smaller, and the expected effect cannot be obtained. Therefore, more preferably, conditional expressions (2) and (3) should hold respectively:

0.7<abs[S _ob (h)/S _im (h)]<1.8 conditional expression (5), and

0.8<R _ob /R _im <1.2 conditional expression (6).

Also, more preferably, conditional expression (5) should hold:

0.7 < abs[S _ob (h)/S _im (h)] < 1.6 Conditional expression (7).

Next, conditions of parameters defining optical characteristics of the lenses L1 , L2 , and L3 included in the imaging lens group 101 will be described with reference to FIG. 5 . RDN in FIG. 5 shows parameters of the respective surfaces S1 to S6 of the respective lenses constituting the imaging lens group 101 according to the first embodiment, R is the radius of curvature of the lens surface, D is the distance between individual lenses, and Nd is The refractive index on each surface, Vd is the Abbe number, and φ is the optical effective diameter of each lens.

Here, D1 represents the distance between the image side (S2) of lens L1 and the object side (S3) of lens L2, D2 represents the distance between the image side (S4) of lens L2 and the object side (S5) of lens L3, D1 and D2 show different values when the lens group is in the closed position and the open position. Specifically, as shown in FIG. 5 , D1: 0.01 and D2: 0.01 at the closed position, and D1: 1.23 and D2: 1.69 at the open position.

"Aspherical Coefficients" in FIG. 5 indicates aspherical coefficients of the corresponding order.

Among the parameters shown in the RDN table of FIG. 5 , R, D, Nd, and φ are designed to satisfy all of the above-mentioned conditional expressions (1) to (3). Abbe's number Vd is a value that corrects axial chromatic aberration and chromatic aberration of magnification in a well-balanced manner.

The shape of the aspheric lens is given by the expression of the aspheric shape shown in the following expression (8), where Z represents the depth of the aspheric surface, Y represents the distance (height) from the optical axis to the lens surface, and R represents the near Axial curvature radius, K represents the conic constant, C ₄ , C ₆ , C ₈ and C ₁₀ represent the aspheric coefficients of the fourth order, sixth order, eighth order and tenth order respectively.

Z＝(Y ² /R)/[1-{1-(1+K)(Y ² /R ² )} ^1/2 ]+C ₄ Y ⁴ +C ₆ Y ⁶ +C ₈ Y ⁸ +C ₁₀ Y ¹⁰ conditional expression (8).

In the example shown in FIG. 5, lens L2 is an aspheric lens. Lenses L1 and L3 have aspheric surfaces on one side and spherical surfaces on the other side. At least one of the lenses L1, L2, and L3 may be a resin lens. For example, when the aspheric lens is composed of an easily processed resin lens, the manufacturing cost of the imaging lens group 101 can be reduced.

Comparing the total focal length of the lens group in the closed position and the open position in the table shown in FIG. 4B, it is 29.14mm in the closed position and 23.94mm in the open position. Therefore, by changing the state from the closed position to the open position and changing the refractive power distribution, the three lenses L1, L2, and L3 are allowed to function as zoom lenses.

In addition, it should be understood that those representing the values of conditional expressions (1) to (3) in the table shown in FIG. 4B satisfy conditional expressions (4) to (6) providing more preferable conditions, and those providing more preferable conditions conditional expression (7). Therefore, the lenses L1, L2, and L3 in this embodiment behave as a single lens in the entire lens group at the closed position, and when separated toward the open position, the lenses can change the refractive power of the entire lens group due to the refractive power of each lens The distribution makes more than the value at the closed position.

As described above, when a plurality of lenses are arranged to form a lens group and their arrangement relationship does not satisfy Conditional Expressions (1) to (3), the plurality of lenses only exist individually to realize respective optical characteristics. On the other hand, according to the first embodiment of the present disclosure, the arrangement relationship of the plurality of lenses is set such that conditional expressions (1) to (3) are satisfied in the closed position, and the lenses have a predetermined refractive power in the open position. This allows the lenses as a lens group to generate a distribution of refractive power according to the positional relationship of the lenses. Therefore, it is possible to prevent the imaging device from being increased in size when the refractive power distribution is realized.

(second embodiment)

Next, a second embodiment will be described. A detailed description of content overlapping with the first embodiment will be omitted below.

6A and 6B are diagrams showing an imaging lens group 102 according to a second embodiment of the present disclosure, which can be realized as the imaging lens group 11 shown in the configuration example of the smartphone 10 . FIG. 6A shows the lens positions of the imaging lens group 102 at the closed position and the open position, respectively, and FIG. 6B shows a table showing the focal lengths and the like of the imaging lens group 102 at the closed position and the open position.

In FIG. 6A , lenses L1 , L2 , L3 , and L4 of the imaging lens group 102 according to the second embodiment are arranged sequentially from the object side on the left side in FIG. 6A to the image side on the right side in FIG. 6A . That is, the lens L1 is positioned closest to the object side, and the lens L4 is positioned closest to the image side.

The shapes of the lenses L1, L2, L3 and L4 are as shown in Fig. 6A. In the imaging lens group 102, the lenses L1 and L2 have negative refractive power. Lenses L3 and L4 have positive refractive power. Lens L3 is an aspheric lens.

Each lens of the imaging lens group 102 satisfies the conditions shown in FIG. 6B , and the shape is defined by the lens parameters shown in FIG. 7 .

FIG. 7 is a table showing lens parameters of the respective lenses constituting the imaging lens group 102 according to the second embodiment. 6B is a conditional expression (1) showing the focal lengths of the lenses constituting the imaging lens group 102 according to the second embodiment, the total focal lengths of the entire lens group at the open position and the closed position, and the lenses L1, L2, L3, and L4 ) to (3) each value table.

Various aberrations can be corrected by setting the lens parameters of the respective lenses according to the conditions in FIG. 6B. In addition, since the Abbe number of each lens is set as shown in Fig. 7, chromatic aberration can be corrected. In addition, comparing the total focal length of the closed position and the open position, the total focal length of the open position is 58.82mm, and the total focal length of the closed position is 341.42mm, which is about 5.8 times the total focal length of the open position. Therefore, the four lenses L1 , L2 , L3 and L4 of the imaging lens group 102 can function as zoom lenses by changing the state from the closed position to the open position and changing the refractive power distribution.

As shown in FIG. 6A, lenses L1 and L2, lenses L2 and L3, and lenses L3 and L4 have approximate shapes at least near the optical axis on opposite sides S2 and S3, S4 and S5, and S6 and S7, respectively. Therefore, the lenses in the closed position can approach each other to satisfy Conditional Expressions (1) to (3), and have a refractive power equivalent to that of a single lens.

(third embodiment)

Next, a third embodiment will be described. A detailed description of content overlapping with the first embodiment will be omitted below.

8A and 8B are diagrams illustrating an imaging lens group 103 according to a third embodiment of the present disclosure, which can be realized as the imaging lens group 11 shown in the configuration example of the smartphone 10 . 8A shows the lens positions of the imaging lens group 103 in the closed position and the open position, respectively, and FIG. 8B shows a table showing the focal lengths and the like of the imaging lens group 103 in the closed position and the open position. The lens configuration of the imaging lens group 103 corresponds to the conditions in FIG. 8B and the lens parameters in FIG. 9 , which will be described later.

As shown in FIG. 8A , the imaging lens group 103 of the present embodiment includes two lenses L1 and L2 . Lenses L1 and L2 are arranged in order from the object side on the left side of FIG. 8A to the image side on the right side of FIG. 8A . The lens L1 is positioned closest to the object side, and the lens L2 is positioned closest to the image side.

The shapes of lenses L1 and L2 are as shown in FIG. 8A. In the imaging lens group 103, the lens L1 has negative refractive power. Lens L2 has positive refractive power. Lenses L1 and L2 are aspherical lenses.

Each lens of the imaging lens group 103 satisfies the conditions shown in FIG. 8B , and the shape is defined by the lens parameters shown in FIG. 9 .

8B is conditional expressions (1) to (3) showing the focal lengths of the lenses constituting the imaging lens group 103 according to the third embodiment, the total focal lengths of the entire lens group at the open position and the closed position, and the lenses L1 and L2 A table of values for . FIG. 9 is a table showing lens parameters of the respective lenses constituting the imaging lens group 103 according to the third embodiment.

Various aberrations can be corrected by setting the lens parameters of the respective lenses according to the conditions in FIG. 8B. In addition, since the Abbe number of each lens is set as shown in Fig. 9, chromatic aberration can be corrected. In addition, comparing the total focal length of the closed position and the open position, the total focal length of the open position is 13.48mm, and the total focal length of the closed position is 89.97mm, which is about 6.7 times the total focal length of the open position. Therefore, the two lenses L1 and L2 of the imaging lens group 103 can function as zoom lenses by changing the state from the closed position to the open position and changing the refractive power distribution.

As shown in FIG. 8A , lenses L1 and L2 have approximate shapes at least in the vicinity of the optical axis on opposite sides S2 and S3 . Therefore, the lenses in the closed position can approach each other to satisfy Conditional Expressions (1) to (3), and have a refractive power equivalent to that of a single lens.

(fourth embodiment)

Next, a fourth embodiment will be described. A detailed description of content overlapping with the first embodiment will be omitted below.

10A and 10B are diagrams showing an imaging lens group 104 according to a fourth embodiment of the present disclosure, which can be realized as the imaging lens group 11 shown in the configuration example of the smartphone 10 . FIG. 10A shows the lens positions of the imaging lens group 104 at the closed position and the open position, respectively, and FIG. 10B shows a table showing the focal lengths and the like of the imaging lens group 104 at the closed position and the open position.

As shown in FIG. 10A , the imaging lens group 104 of the present embodiment includes two lenses L1 and L2 . The lenses L1 and L2 are arranged in order from the object side on the left side of FIG. 10A to the image side on the right side of FIG. 10A . The lens L1 is positioned closest to the object side, and the lens L2 is positioned closest to the image side.

The shapes of lenses L1 and L2 are as shown in FIG. 10A. In the imaging lens group 104, the lens L1 has negative refractive power. Lens L2 has positive refractive power. Lens L1 is an aspheric lens.

Each lens of the imaging lens group 104 satisfies the conditions shown in FIG. 10B , and the shape is defined by the lens parameters shown in FIG. 11 .

10B is conditional expressions (1) to (3) showing the focal lengths of the lenses constituting the imaging lens group 104 according to the fourth embodiment, the total focal lengths of the entire lens group at the open position and the closed position, and the lenses L1 and L2 A table of values for . FIG. 11 is a table showing lens parameters of the respective lenses constituting the imaging lens group 104 according to the fourth embodiment.

Various aberrations can be corrected by setting the lens parameters of the respective lenses according to the conditions in FIG. 10B . In addition, since the Abbe number of each lens is set as shown in Fig. 11, chromatic aberration can be corrected. In addition, comparing the total focal length of the closed position and the open position, the total focal length of the closed position takes a negative value of -60.40mm, and the total focal length of the open position takes a positive value of 50.20mm. Therefore, the two lenses L1 and L2 of the imaging lens group 104 can function as zoom lenses by changing the state from the closed position to the open position and changing the refractive power distribution from negative to positive.

As shown in FIG. 10A, opposite sides S2 and S3 of lenses L1 and L2 are close to each other with a slight gap therebetween in the closed position. However, even in this case, lenses L1 and L2 satisfy Conditional Expressions (1) to (3), so that the lens in the closed position has a refractive power equivalent to that of a single lens.

(fifth embodiment)

Next, a fifth embodiment will be described. A detailed description of content overlapping with the first embodiment will be omitted below.

12A and 12B are diagrams illustrating an imaging lens group 105 according to a fifth embodiment of the present disclosure, which can be realized as the imaging lens group 11 shown in the configuration example of the smartphone 10 . FIG. 12A shows the lens positions of the imaging lens group 105 at the closed position and the open position, respectively, and FIG. 12B shows a table showing the focal lengths and the like of the imaging lens group 105 at the closed position and the open position.

As shown in FIG. 12A , the imaging lens group 105 of the present embodiment includes three lenses L1 to L3 . Lenses L1 , L2 , and L3 are arranged in this order from the object side on the left side of FIG. 12A to the image side on the right side of FIG. 12A . The lens L1 is positioned closest to the object side, and the lens L3 is positioned closest to the image side.

The shapes of the lenses L1, L2 and L3 are as shown in Fig. 12A. In the imaging lens group 105, the lenses L1 and L3 have negative refractive power. Lens L3 is an aspheric lens. Lens L2 has positive refractive power.

Each lens of the imaging lens group 105 satisfies the conditions shown in FIG. 12B , and the shape is defined by the lens parameters shown in FIG. 13 .

12B is a graph showing the focal lengths of the lenses constituting the imaging lens group 105 according to the fifth embodiment, the total focal lengths of the entire lens group at the open position and the closed position, and conditional expressions (1) to ( 3) The table of each value. FIG. 13 is a table showing lens parameters of the respective lenses constituting the imaging lens group 105 according to the fifth embodiment.

Various aberrations can be corrected by setting the lens parameters of the respective lenses according to the conditions in FIG. 12B. In addition, since the Abbe number of each lens is set as shown in Fig. 13, chromatic aberration can be corrected. In addition, comparing the total focal length of the closed position and the open position, the total focal length of the closed position takes a negative value of -60.40mm, and the total focal length of the open position takes a positive value of 50.20mm. Therefore, the three lenses L1, L2, and L3 of the imaging lens group 105 can function as zoom lenses by changing the state from the closed position to the open position and changing the refractive power distribution from negative to positive.

As shown in FIG. 12A , lenses L1 and L2 have approximate shapes at least in the vicinity of the optical axis on opposite sides S2 and S3 . The same applies to lenses L2 and L3. Therefore, the lenses in the closed position can approach each other to satisfy Conditional Expressions (1) to (3), and have a refractive power equivalent to that of a single lens.

(sixth embodiment)

Next, a sixth embodiment will be described. A detailed description of content overlapping with the first embodiment will be omitted below.

14A and 14B are diagrams showing an imaging lens group 106 according to a sixth embodiment of the present disclosure, which can be realized as the imaging lens group 11 shown in the configuration example of the smartphone 10 . 14A shows the lens positions of the imaging lens group 106 at the closed position and the open position, respectively, and FIG. 14B shows a table showing the focal lengths and the like of the imaging lens group 106 at the closed position and the open position.

As shown in FIG. 14A , the imaging lens group 106 of the present embodiment includes three lenses L1 to L3 . Lenses L1 , L2 , and L3 are arranged in order from the object side on the left side of FIG. 14A to the image side on the right side of FIG. 14A . The lens L1 is positioned closest to the object side, and the lens L3 is positioned closest to the image side.

The shapes of the lenses L1, L2 and L3 are as shown in Fig. 14A. In the imaging lens group 106, the lenses L1 and L2 have negative refractive power. Lenses L1, L2, and L3 are aspherical lenses. Lens L3 has positive refractive power.

Each lens of the imaging lens group 106 satisfies the conditions shown in FIG. 14B , and the shape is defined by the lens parameters shown in FIG. 15 .

14B is a graph showing the focal lengths of the lenses constituting the imaging lens group 106 according to the sixth embodiment, the total focal lengths of the entire lens group at the open position and the closed position, and conditional expressions (1) to ( 3) The table of each value. FIG. 15 is a table showing lens parameters of the respective lenses constituting the imaging lens group 106 according to the sixth embodiment.

Various aberrations can be corrected by setting the lens parameters of the respective lenses according to the conditions in FIG. 14B. In addition, since the Abbe number of each lens is set as shown in Fig. 15, chromatic aberration can be corrected. In addition, comparing the total focal length of the closed position and the open position, the total focal length of the closed position takes a negative value of -60.40mm, and the total focal length of the open position takes a positive value of 50.20mm. Therefore, the three lenses L1, L2, and L3 of the imaging lens group 106 can function as zoom lenses by changing the state from the closed position to the open position and changing the refractive power distribution from negative to positive.

As shown in Figure 14A, opposite sides S3, S4 and S5 of lenses L1, L2 and L3 have a slight gap therebetween in the closed position. However, even in this case, the lenses L1, L2, and L3 satisfy Conditional Expressions (1) to (3), so that the lenses in the closed position have the same refractive power as a single lens.

FIG. 16 summarizes the values of conditional expressions (1) to (3) for each example. As can be seen from the values in the table, each example satisfies conditional expressions (1) to (3). Furthermore, since Conditional Expressions (4) to (6) and (7) are satisfied in Examples 1, 2, and 3, the imaging lenses constituting Examples 1, 2, and 3 have more preferable parameters.

The above disclosure discloses exemplary embodiments only, and is not intended to limit the scope of protection of the present invention. Those skilled in the art can understand that all or part of the above embodiments and all or part of other embodiments and modifications obtained based on the scope of the claims of the present invention certainly belong to the scope of the present invention.

Claims (16)

1. An optical device, comprising:

a lens group including a plurality of lenses;

a moving unit configured to move the plurality of lenses; and

a control unit configured to control the moving unit to change between a closed position state in which the plurality of lenses are closest to each other so as to function like one lens, and an open position state in which the plurality of lenses are placed apart from each other.

2. The apparatus of claim 1, wherein the device comprises a plurality of sensors,

the plurality of lenses in the closed position state are configured to satisfy a condition provided by the following equation (1):

D _min /φ < 0.2 (1)，

wherein D is _min Two adjacent lenses indicative of the lens groupAnd phi indicates the optical effective diameter of the lens having the largest lens diameter in the lens group.

3. The device according to claim 1 or 2, wherein,

the plurality of lenses includes a first lens and a second lens that are aspherical surfaces opposite to each other, wherein an image side surface of the first lens and an object side surface of the second lens facing the image side surface of the first lens have shapes represented by the following equations (2) and (3):

0.5 < abs[S _ob (h)/S _im (h)] < 2.0 (2)，

wherein S is _ob (h) Indicating the sag of the object side surface of the second lens at a height h from the optical axis, S _im (h) Indicating an amount of sag of the image side surface of the first lens at the height h, an

0.7 < R _ob /R _im < 1.3 (3)，

Wherein R is _ob Indicating a radius of curvature, R, of the object side surface of the second lens _im Indicating a radius of curvature of the image side of the first lens.

4. The apparatus of claim 2, wherein the device comprises a plurality of sensors,

the plurality of lenses in the closed position state are specifically configured to satisfy the condition provided by the following equation (4):

D _min /φ < 0.1 (4)。

5. the apparatus of claim 3, wherein the device comprises a plurality of sensors,

the image side surface of the first lens and the object side surface of the second lens facing the image side surface of the first lens are specifically configured to have shapes represented by the following equations (5) and (6):

0.7<abs[S _ob (h)/S _im (h)]<1.8 (5)

0.8 < R _ob /R _im < 1.2 (6)。

6. The apparatus of claim 5, wherein the device comprises a plurality of sensors,

the image side surface of the first lens and the object side surface of the second lens facing the image side surface of the first lens are specifically configured to have a shape represented by the following equation (7):

0.7 < abs[S _ob (h)/S _im (h)] < 1.6 (7)。

7. an apparatus, comprising:

an optical device, an image sensor that receives light passing through the optical device, and a processor for generating image data based on an output signal from the image sensor, wherein the optical device comprises:

a lens group including a plurality of lenses;

a moving unit configured to move the plurality of lenses; and

a control unit configured to control the moving unit to change between a closed position state in which the plurality of lenses are closest to each other so as to function like one lens, and an open position state in which the plurality of lenses are placed apart from each other.

8. The apparatus of claim 7, wherein the device comprises a plurality of sensors,

the plurality of lenses in the closed position state are configured to satisfy a condition provided by the following equation (8):

D _min /φ < 0.2 (8)，

wherein D is _min Indicating the distance between two adjacent lenses of the lens group, phi indicating the optical effective diameter of the lens group having the largest lens diameter.

9. The apparatus according to claim 7 or 8, wherein,

the plurality of lenses includes a first lens and a second lens that are aspherical surfaces opposite to each other, wherein an image side surface of the first lens and an object side surface of the second lens facing the image side surface of the first lens have shapes represented by the following equations (9) and (10):

0.5 < abs[S _ob (h)/S _im (h)] < 2.0 (9)，

wherein S is _ob (h) Indicating the sag of the object side surface of the second lens at a height h from the optical axis, S _im (h) Indicating an amount of sag of the image side surface of the first lens at the height h, an

0.7 < R _ob /R _im < 1.3 (10)，

Wherein R is _ob Indicating a radius of curvature, R, of the object side surface of the second lens _im Indicating a radius of curvature of the image side of the first lens.

10. The apparatus of claim 8, wherein the device comprises a plurality of sensors,

the plurality of lenses in the closed position state are specifically configured to satisfy the condition provided by the following equation (11):

D _min /φ < 0.1 (11)。

11. the apparatus of claim 9, wherein the device comprises a plurality of sensors,

the image side surface of the first lens and the object side surface of the second lens facing the image side surface of the first lens are specifically configured to have shapes represented by the following equations (12) and (13):

0.7 < abs[S _ob (h)/S _im (h)] < 1.8 (12)，

0.8 < R _ob /R _im < 1.2 (13)。

12. the apparatus of claim 11, wherein the device comprises a plurality of sensors,

the image side surface of the first lens and the object side surface of the second lens facing the image side surface of the first lens are specifically configured to have a shape represented by the following equation (14):

0.7 < abs[S _ob (h)/S _im (h)] < 1.6 (14)。

13. a method for controlling the optical power of a lens group comprising a plurality of lenses, comprising:

an actuator moves the plurality of lenses between a closed position state in which the plurality of lenses are closest to each other so as to function like one lens, and an open position state in which the plurality of lenses are placed apart from each other.

14. The method of claim 13, wherein the step of determining the position of the probe is performed,

the closed position state is configured as a state in which the plurality of lenses satisfy a condition provided by the following equation (15):

D _min /φ < 0.2 (15)，

wherein D is _min Indicating the distance between two adjacent lenses of the lens group, phi indicating the optical effective diameter of the lens group having the largest lens diameter.

15. The method of claim 14, wherein the step of providing the first information comprises,

the closed position state is specifically configured as a state in which the plurality of lenses satisfy a condition provided by the following equation (16):

D _min /φ < 0.1 (16)。

16. a non-transitory computer readable storage medium, characterized in that it stores a program that causes a processor to execute the method according to any one of claims 13 to 15.

Images