Lens device and imaging device

Abstract

The present invention aims to provide a lens device having a mechanism for switching optical units that enables imaging with the same imaging magnification but different image representations. [Solution] A lens device according to the embodiment of this specification is a lens device having a plurality of lenses, comprising: a first optical unit consisting of some of the lenses of the plurality of lenses; a second optical unit consisting of some of the lenses of the plurality of lenses and different from the first optical unit; and a switching mechanism that can switch between the first optical unit and the second optical unit, wherein the focal length of the first optical unit and the focal length of the second optical unit are the same.

Description

Technical Field

[0001] The disclosure of this specification relates to a lens device and an imaging device for imaging still images and moving images.

Background Art

[0002] In recent years, in the broadcasting industry, high-resolution video technologies such as 4K and 8K have been rapidly evolving. Along with this, various technologies have also been developed for lens devices for broadcast cameras to support high-resolution.

[0003] On the other hand, different video expressions (video effects) have come to be required according to the shooting situation. For example, in live broadcasts such as sports broadcasts, in addition to the conventional video expression of clear imaging, a video expression of imaging like in a cinema is also required. Thus, there is a need for a lens device that can selectively image with different video expressions, such as performing high-resolution imaging that is normally clear and creating a blurry effect to emphasize the subject at a certain timing. Patent Document 1 discloses a lens device that switches a certain lens group according to the situation.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] The lens device according to some embodiments of this specification aims to provide a lens device that develops conventional technology.

Means for Solving the Problems

[0006] A lens device according to an embodiment of this specification is a lens device having a plurality of lenses, characterized in that it comprises a first optical unit consisting of some of the lenses of the plurality of lenses, a second optical unit consisting of some of the lenses of the plurality of lenses and different from the first optical unit, and a switching mechanism that can switch between the first optical unit and the second optical unit, wherein the focal length of the first optical unit and the focal length of the second optical unit are equivalent.

[0007] Other embodiment lens devices are lens devices having a plurality of lenses, characterized in that they include a first optical unit consisting of some of the lenses of the plurality of lenses, a second optical unit consisting of some of the lenses of the plurality of lenses and different from the first optical unit, and a switching mechanism that can switch between the first optical unit and the second optical unit, wherein the image representation obtained by the lens device into which the first optical unit is inserted is different from the image representation obtained by the lens device into which the second optical unit is inserted. [Effects of the Invention]

[0008] In a lens device having a mechanism for switching optical units, it is possible to provide a lens device that is an advancement of conventional technology. [Brief explanation of the drawing]

[0009] [Figure 1] Cross-sectional view of the lens in Example 1. [Figure 2] A diagram showing the optical unit switching structure of Example 1. [Figure 3] Aberration diagram of Example 1. [Figure 4] Cross-sectional view of the lens in Example 2. [Figure 5] A diagram showing the optical unit switching structure of Example 2. [Figure 6] Aberration diagram of Example 2. [Figure 7] Cross-sectional view of the lens in Example 3. [Figure 8] Aberration diagram of Example 3. [Figure 9] A schematic diagram of an imaging device equipped with a lens mechanism. [Modes for carrying out the invention]

[0010] The embodiments of the present invention will now be described in detail with reference to the drawings. The embodiments of the present invention relate to a lens device having a mechanism for switching optical units. The lens devices of each embodiment are used in various imaging devices such as broadcast video cameras, movie cameras, general-purpose digital still cameras, and general-purpose digital video cameras.

[0011] Figure 1 shows a cross-sectional view of the lens of Example 1. Figure 1(a) shows a cross-sectional view of the lens with the first optical unit 1 inserted. This shows a state in which sharp images are captured as an image expression (image effect). Figure 1(b) shows a cross-sectional view of the lens with the second optical unit 2 inserted. This shows a state in which images are captured with a blurred effect as an image expression.

[0012] The lens device of Example 1 is composed of five lens groups, including a first lens group L1 with positive refractive power, a second lens group L2 with negative refractive power, a third lens group L3 with positive refractive power, a fourth lens group L4 with positive refractive power, and a fifth lens group L5 with positive refractive power. The lens device of Example 1 is a zoom lens, in which the first lens group L1 and the fifth lens group L5 are fixed during magnification, while the second lens group L2, the third lens group L3, and the fourth lens group L4 move along different trajectories. Furthermore, the lens device has an aperture diaphragm SP on the magnification conjugate side of the fifth lens group L5. In this way, the lens device of this embodiment, by being a multi-group configuration composed of multiple lens groups, can be made into a high-magnification zoom lens and is configured to enable high-resolution imaging.

[0013] Furthermore, the optical unit LL1, which is part of the fifth lens group L5, has a switchable configuration. By performing the switch in a fixed group that does not move during magnification, the mechanical structural error is minimized, enabling stable image switching.

[0014] In addition, in this embodiment, by using a switching mechanism of the rotation type as shown in FIG. 2, it is possible to switch between different types of optical units (the first optical unit 1 and the second optical unit 2) while being small-sized. However, if the focal lengths of the first optical unit 1 and the second optical unit 2 are different, the picture frame (picture angle) will change during switching, which will give the viewer a sense of discomfort. Therefore, the lens device of this embodiment makes the focal lengths of the first optical unit 1 and the second optical unit 2 equal, so that no change in the picture frame occurs when switching the optical units.

[0015] Specifically, when the focal length of the first optical unit 1 is fu1 and the focal length of the second optical unit 2 is fu2, 0.95 < fu1 / fu2 < 1.05 (1) satisfies the condition.

[0016] The condition of formula (1) indicates that the focal lengths of the first optical unit 1 and the second optical unit 2 are equal.

[0017] In addition, it is more preferable to set the range of formula (1) as follows. 0.99 < fu1 / fu2 < 1.01 (1a)

[0018] In addition, an optical element capable of clear video expression is arranged in the first optical unit 1, and an optical element capable of producing a blurred video expression is arranged in the second optical unit 2.

[0019] With such a configuration, for example, in a live sports broadcast or the like, by arbitrarily switching between the first optical unit 1 and the second optical unit 2, it is possible to instantaneously capture different video expressions while there is no change in the picture frame (picture angle) and no sense of discomfort.

[0020] Next, the means for realizing different video expressions by switching the optical units will be described. Specifically, the optical system of the optical unit is configured such that the spherical aberration of the lens device is different when the first optical unit 1 and the second optical unit 2 are inserted.

[0021] In this embodiment, the first optical unit 1, which achieves sharp image reproduction, is configured to suppress spherical aberration, while the second optical unit 2, which achieves image reproduction with a bokeh effect, is configured to intentionally introduce spherical aberration.

[0022] Figure 3 shows the aberration diagrams of this embodiment. Figure 3(a) shows the aberration diagram when the first optical unit 1 described above is inserted, and Figure 3(b) shows the aberration diagram when the second optical unit 2 described above is inserted. As can be seen by comparing the spherical aberration shown in Figure 3(a) and the spherical aberration shown in Figure 3(b), the magnitude of the spherical aberration when the first optical unit 1 is inserted is smaller than when the second optical unit 2 is inserted. Therefore, the image captured with the optical system with the characteristics shown in Figure 3(a) is a clear and high-resolution image. On the other hand, the image captured with the optical system with the characteristics shown in Figure 3(b) can be an image with a bokeh effect that makes the subject stand out.

[0023] By setting spherical aberration to underexposed (on the subject side relative to the sensor plane) and satisfying the following conditions, a better bokeh effect can be achieved.

[0024] Specifically, when the pixel width of the sensor (image sensor) is p and the spherical aberration is SA, -170 <SA / p<0 (2) The following condition is satisfied.

[0025] This demonstrates that a more desirable bokeh effect can be achieved by satisfying the conditions in equation (2).

[0026] Furthermore, it is preferable to set the range of equation (2) as follows. -85 <SA / p<0 (2a)

[0027] When the second optical unit 2 of this embodiment is inserted, if SA = -0.20 mm and the sensor pixel width (sensor pitch) p = 0.0025 mm, then SA / p = -80, which satisfies equations (2) and (2a), thus achieving a desirable bokeh effect.

[0028] Specifically, the difference in spherical aberration described above can be achieved by making the radius of curvature, the spacing between lenses, or the refractive index of any of the lenses included in the first optical unit 1 and the second optical unit 2 different.

[0029] Next, we will explain flange back (FB) adjustment. In this embodiment, when the first optical unit 1 and the second optical unit 2 are switched, the spherical aberration changes, and the appropriate focus position suitable for image expression also changes.

[0030] For example, in Example 1, when the second optical unit 2 is inserted, spherical aberration (SA) is underexposed, so shifting the flange back (FB) value to the relatively underexposed side (for example, -0.03 mm) makes it possible to achieve a more desirable image representation.

[0031] However, the value (adjustment value) of this flange back position may be switched according to the user's preference. Therefore, in this embodiment, by providing a flange back adjustment mechanism, the flange back position can be adjusted to an appropriate focus position according to the type of optical unit inserted and the user's preference. Furthermore, by adjusting the flange back position according to the zoom state, focus state, and aperture state of the lens device, good image expression is possible in any shooting situation.

[0032] In the lens device of the present invention, the switching of optical units is not limited to the two types shown in Figure 2 (first optical unit 1 in U11 and second optical unit 2 in U12). For example, as shown in Figure 5, a third optical unit 3 that increases the imaging magnification may be switched separately from the first optical unit 1 and the second optical unit 2. Furthermore, there may be four or more switching modes.

[0033] Furthermore, in the lens device of the present invention, it is preferable that the light rays passing through the optical unit are afocal in order to suppress focus shift due to positional errors when inserting (switching) the optical unit.

[0034] [Example 1] Figure 1 shows a cross-sectional view of the imaging lens unit of the lens device in Example 1.

[0035] Figure 1(a) shows a cross-sectional view when the first optical unit 1 is inserted (sharp state), and Figure 1(b) shows a cross-sectional view when the second optical unit 2 is inserted (blurred state).

[0036] The imaging lens unit of Example 1 is a zoom lens. The imaging lens unit of Example 1 has a first lens group L1 with positive refractive power that does not move for magnification, and a second lens group L2 with negative refractive power that moves for magnification, arranged in order from the magnification conjugate side (object side) to the image side. Furthermore, it has a third lens group L3 with positive refractive power that moves for magnification, a fourth lens group L4 with positive refractive power that moves for magnification, and a fifth lens group L5 with positive refractive power that does not move for magnification. The aperture SP is located on the magnification conjugate side of the fifth lens group L5 and is fixed during magnification.

[0037] The optical unit LL1, included in the fixed lens group L5 (5th lens group), is a switchable optical unit composed of four lenses: a negative refractive power lens, a positive refractive power lens, a negative refractive power lens, and a positive refractive power lens. The glass block p1 is a color separation prism or optical filter, etc. The imaging surface (light-receiving surface) of the image sensor s1, which acts as a photoelectric conversion element, is positioned on the image plane I.

[0038] In Example 1, by providing a configuration that satisfies the above-described equations (1) and (2), a lens device is realized that is compact yet capable of imaging with the same magnification but different image representations. The values ​​of equations (1) and (2) in Numerical Example 1 are shown in Table (B) of Numerical Example 1.

[0039] Figure 2 shows an illustrative diagram of the optical unit switching structure in Embodiment 1. The configuration in Figure 2 involves placing the first optical unit 1 at U11 and the second optical unit 2 at U12.

[0040] Figure 3 shows the aberration diagram (d line representation) of the lens device in Example 1. Figure 3(a) shows the aberration diagram at the wide-angle end when the first optical unit 1 is inserted into the optical unit LL1. Figure 3(b) shows the aberration diagram at the wide-angle end when the second optical unit 2 is inserted into the optical unit LL1. It can be seen that the spherical aberration shown in Figure 3(b) is significantly underexposed compared to the spherical aberration shown in Figure 3(a).

[0041] [Example 2] Figure 4 shows a cross-sectional view of the imaging lens unit of the lens device of Example 2. Figure 4 shows a cross-sectional view when the third optical unit 3 is inserted.

[0042] Figure 4 shows an example in which a third optical unit 3 can be switched in addition to the first optical unit 1 and second optical unit 2 of Example 1. The lens device of Example 2 can switch between three different optical units. The configurations of the first optical unit 1 and the second optical unit 2 in Example 2 are the same as in Example 1, so their description is omitted.

[0043] The imaging lens unit of Example 2 is a zoom lens. The imaging lens unit of Example 2 has a first lens group L1 with positive refractive power that does not move for magnification, and a second lens group L2 with negative refractive power that moves for magnification, arranged in order from the magnification conjugate side (object side) to the image side. Furthermore, it has a third lens group L3 with positive refractive power that moves for magnification, a fourth lens group L4 with positive refractive power that moves for magnification, and a fifth lens group L5 with positive refractive power that does not move for magnification. The aperture SP is located on the magnification conjugate side of the fifth lens group L5 and is fixed during magnification.

[0044] The optical unit LL2, included in the fixed lens group L5 (5th lens group), is a switchable optical unit composed of four lenses: a negative refractive power lens, a positive refractive power lens, a negative refractive power lens, and a positive refractive power lens. The glass block p2 consists of a color separation prism, an optical filter, etc. The imaging surface (light-receiving surface) of the image sensor s2, which acts as a photoelectric conversion element, is positioned on the image plane I.

[0045] Figure 5 shows an illustrative diagram of the optical unit switching structure in Embodiment 2. The first optical unit 1 is placed in U21 of the switching mechanism in Figure 5, the second optical unit 2 is placed in U22, and the third optical unit 3, which can double the imaging magnification, is placed in U23.

[0046] Figure 6 shows the aberration diagram (d-line representation) of the lens device in Example 2. Figure 6 shows the aberration diagram at the wide-angle end when the third optical unit 3 is inserted into the optical unit LL2. Figure 6 shows the aberration diagram at the wide-angle end when the third optical unit 3 is inserted into the optical unit LL2. Similar to the spherical aberration shown in Figure 3(a), the spherical aberration shown in Figure 6 is kept low. Therefore, the third optical unit 3 has a different magnification ratio and a different image representation compared to the second optical unit 2. Also, the third optical unit 3 has a different magnification ratio and a similar image representation compared to the first optical unit 1.

[0047] [Example 3] Figure 7 shows a cross-sectional view of the imaging lens unit of the lens device of Example 3. Figure 7 shows a cross-sectional view when the fourth optical unit 4 is inserted.

[0048] Figure 7 shows an example in which a fourth optical unit 4, different from the spherical aberration of the second optical unit 2 shown in Example 1, can be switched. The lens apparatus of Example 3 may be able to switch between two different optical units, as in Example 1, or it may be able to switch between three different optical units, as in Example 2. The configuration of the first optical unit 1 in Example 3 is the same as in Example 1, so its description is omitted.

[0049] The imaging lens unit of Example 3 is a zoom lens. The imaging lens unit of Example 3 has a first lens group L1 with positive refractive power that does not move for magnification, and a second lens group L2 with negative refractive power that moves for magnification, arranged in order from the magnification conjugate side (object side) to the image side. Furthermore, it has a third lens group L3 with positive refractive power that moves for magnification, a fourth lens group L4 with positive refractive power that moves for magnification, and a fifth lens group L5 with positive refractive power that does not move for magnification. The aperture SP is located on the magnification conjugate side of the fifth lens group L5 and is fixed during magnification.

[0050] The optical unit LL3, included in the fixed lens group L5 (5th lens group), is a switchable optical unit composed of four lenses: a negative refractive power lens, a positive refractive power lens, a negative refractive power lens, and a positive refractive power lens. The glass block p3 consists of a color separation prism, an optical filter, etc. The imaging surface (light-receiving surface) of the image sensor s3, which acts as a photoelectric conversion element, is positioned on the image plane I.

[0051] In Example 3, by providing a configuration that satisfies the above-described equations (1) and (2), a lens device is realized that is compact yet capable of imaging with the same magnification but different image representations. The values ​​of equations (1) and (2) in Numerical Example 3 are shown in Table (B) of Numerical Example 3.

[0052] The switching structure for the optical unit in Example 3 may be either the structure shown in Figure 2 or the structure shown in Figure 5. For example, in the switching mechanism shown in Figure 2, the first optical unit 1 can be placed in U11 and the fourth optical unit 4 can be placed in U12. In the switching mechanism shown in Figure 5, the first optical unit 1 can be placed in U21, the fourth optical unit 4 can be placed in U22, and the third optical unit 3, which can double the shooting magnification, can be placed in U23. Furthermore, in the switching mechanism shown in Figure 5, the first optical unit 1 can be placed in U21, the second optical unit 2 can be placed in U22, and the fourth optical unit 4 can be placed in U23. In this way, three or more optical units with different image expression may be arranged.

[0053] Figure 8 shows the aberration diagram (d-line representation) of the lens device in Example 3. Figure 8 shows the aberration diagram at the wide-angle end when the fourth optical unit 4 is inserted into the optical unit LL3. It can be seen that the spherical aberration shown in Figure 8 is even larger and underexposed compared to the spherical aberration shown in Figure 3(b) when the second optical unit 2 is inserted.

[0054] The following shows the numerical examples for each of Examples 1 to 3. In each numerical example, the surface number i indicates the order of the surfaces when counted from the object side. r is the radius of curvature (mm) of the i-th surface from the object side, and d is the lens thickness or air gap (mm) on the optical axis between the i-th and (i+1)-th surfaces. nd indicates the refractive index at 1 atmosphere at the d-line of the optical material between the i-th and (i+1)-th surfaces. νd indicates the Abbe number with respect to the d-line of the optical material between the i-th and (i+1)-th surfaces. The Abbe number νd with respect to the d-line is given by Nd, NF, and NC, respectively, when the refractive indices at the Fraunhofer lines d-line (587.6 nm), F-line (486.1 nm), and C-line (656.3 nm) are Nd, NF, and NC, respectively. νd = (Nd-1) / (NF-NC) It is represented as follows.

[0055] The half-angle of view ω(°) is calculated by taking 2Y as the diagonal size of the image sensor of the imaging device in which the lens is used, and fw as the focal length of the zoom lens at the wide-angle end. ω = arctan(Y / fw) It is represented as follows. The maximum image height (mm) corresponds to half of the diagonal size 2Y (e.g., 11.00 mm) Y (e.g., 5.50 mm).

[0056] BF stands for back focus (mm). Back focus is the distance along the optical axis from the image-side lens surface (final surface) of a zoom lens to the paraxial image plane, expressed in air equivalent length. The total lens length (mm) is the distance along the optical axis from the object-side lens surface (frontmost surface) to the final surface of the zoom lens, plus the back focus.

[0057] The asterisk (*) next to the surface number indicates that the surface has an aspherical shape. The aspherical shape is expressed by the following formula, where X is the displacement from the surface vertex in the direction of the optical axis, H is the height from the optical axis in the direction perpendicular to the optical axis, the direction of light propagation is positive, R is the radius of paraxial curvature, K is the cone constant, and A4 to A16 are the aspherical coefficients.

[0058]

number

[0059] Note that the cone constant and aspheric coefficient "e±Z" are "×10 ±Z This means "[...]." The explanation of the numerical examples above is the same for all the numerical examples that will be discussed later.

[0060] [Numerical Example 1] (A) Lens configuration 1-1: When the first optical unit 1 is inserted (clear image) Unit: mm Surface data Face number rd nd vd 1 -2942.188 6.00 1.83481 42.7 2 335.459 1.80 3 335.066 23.71 1.43387 95.1 4 -1057.929 0.20 5 525.299 14.68 1.43387 95.1 6 -2449.905 25.25 7 377.042 20.53 1.43387 95.1 8 -1365.497 0.25 9 306.954 16.16 1.43387 95.1 10 1716.232 1.50 11 188.244 16.19 1.43875 94.7 12 408.078 (variable) 13* -532.824 2.20 2.00330 28.3 14 38.132 11.72 15 -44.546 1.45 1.74320 49.3 16 72.565 9.77 1.89286 20.4 17 -46.484 1.63 18 -41.758 2.00 1.88300 40.8 19 -152.608 (variable) 20 152.336 11.49 1.72916 54.7 21* -265.715 6.62 22 139.888 13.50 1.43875 94.7 23 -246.304 0.50 24 264.094 2.60 1.85478 24.8 25 97.106 (Variable) 26 86.506 15.39 1.49700 81.5 27 -236.969 0.50 28 415.877 2.50 1.80518 25.4 29 139.362 7.85 1.60311 60.6 30* -764.201 (variable) 31 (aperture) ∞ 5.46 32 -100.588 1.40 1.88300 40.8 33 50.285 1.36 34 40.817 3.60 1.92286 18.9 35 96.042 4.19 36 -79.866 1.70 1.80400 46.5 37 -114.439 7.69 38 447.233 1.50 1.80400 46.5 39 36.261 4.29 1.84666 23.9 40 154.673 4.71 41 -40.896 1.50 1.89190 37.1 42 100.531 8.12 1.51633 64.1 43 -29.819 12.96 44 95.109 5.83 1.51742 52.4 45 -65.823 1.40 46 -142.700 1.50 1.88300 40.8 47 37.951 7.64 1.48749 70.2 48 -86.098 0.20 49 111.798 7.63 1.51742 52.4 50 -35.378 1.50 1.88300 40.8 51 -107.947 0.20 52 90.094 7.67 1.53996 59.5 53 -53.741 10.00 54 ∞ 33.00 1.60859 46.4 55 ∞ 13.20 1.51633 64.2 56 ∞ 13.30 Image plane ∞ Aspherical data Page 13 K = 1.99852e+00 A 4= 1.15677e-06 A 6=-2.75064e-08 A 8=-3.06848e-10 A10= 9.10515e-13 A12= 3.28486e-15 A14= 1.35261e-18 A16= 5.54400e-22 A 3= 2.74335e-07 A 5= 9.95673e-08 A 7= 4.02226e-09 A 9= 6.12079e-12 A11=-8.52506e-14 A13=-6.85632e-17 A15=-3.84859e-20 Page 21 K = 1.21093e+01 A 4= 2.82183e-07 A 6=-5.59441e-11 A 8=-2.00796e-14 A10= 9.78964e-17 A12=-6.30815e-20 A14= 1.70834e-23 A16=-4.73901e-27 A 3=-2.90901e-08 A 5= 1.58196e-09 A 7= 1.10620e-12 A 9=-1.50730e-15 A11= 5.86871e-20 A13= 1.04584e-22 A15= 1.44467e-25 Page 30 K =-2.23400e+02 A 4= 2.77687e-07 A 6= 4.69555e-10 A 8= 1.39733e-13 A10=-2.98156e-16 A12= 4.58582e-19 A14=-2.25443e-22 A16= 5.80568e-26 A 3= 1.70768e-07 A 5=-5.73181e-09 A 7=-1.36230e-11 A 9= 7.92918e-15 A11=-8.14405e-18 A13= 2.06016e-21 A15=-8.57551e-25 Various data Zoom ratio 119.84 Focal length 8.51 28.15 100.04 339.91 1019.53 F-number 1.75 1.75 1.75 1.75 5.25 Field of view 32.88 11.05 3.15 0.93 0.31 Image height 5.50 5.50 5.50 5.50 5.50 Lens length 677.55 677.55 677.55 677.55 677.55 BF 13.30 13.30 13.30 13.30 13.30 d12 3.47 94.70 154.53 185.25 194.08 d19 289.33 168.20 96.92 55.51 2.00 d25 4.21 21.63 10.30 4.07 4.44 d30 2.99 15.47 38.25 55.16 99.48 Zoom lens group data Group starting plane focal length 1 1 251.76 2 13 -24.09 3 20 134.68 4 26 112.47 5 31 42.14 1-2: When the second optical unit 2 is inserted (blurred state) Unit: mm Surface data Face number rd nd vd 1 -2942.188 6.00 1.83481 42.7 2 335.459 1.80 3 335.066 23.71 1.43387 95.1 4 -1057.929 0.20 5 525.299 14.68 1.43387 95.1 6 -2449.905 25.25 7 377.042 20.53 1.43387 95.1 8 -1365.497 0.25 9 306.954 16.16 1.43387 95.1 10 1716.232 1.50 11 188.244 16.19 1.43875 94.7 12 408.078 (variable) 13* -532.824 2.20 2.00330 28.3 14 38.132 11.72 15 -44.546 1.45 1.74320 49.3 16 72.565 9.77 1.89286 20.4 17 -46.484 1.63 18 -41.758 2.00 1.88300 40.8 19 -152.608 (variable) 20 152.336 11.49 1.72916 54.7 21* -265.715 6.62 22 139.888 13.50 1.43875 94.7 23 -246.304 0.50 24 264.094 2.60 1.85478 24.8 25 97.106 (Variable) 26 86.506 15.39 1.49700 81.5 27 -236.969 0.50 28 415.877 2.50 1.80518 25.4 29 139.362 7.85 1.60311 60.6 30* -764.201 (variable) 31 (aperture) ∞ 5.46 32 -100.588 1.40 1.88300 40.8 33 50.285 1.36 34 40.817 3.60 1.92286 18.9 35 96.042 4.19 36 -79.866 1.70 1.80400 46.5 37 -114.439 7.69 38 592.419 1.50 1.80400 46.5 39 36.658 4.29 1.84666 23.9 40 154.907 5.88 41 -42.139 1.50 1.89190 37.1 42 100.900 8.12 1.51633 64.1 43 -30.067 12.96 44 95.109 5.83 1.51742 52.4 45 -65.823 1.40 46 -142.700 1.50 1.88300 40.8 47 37.951 7.64 1.48749 70.2 48 -86.098 0.20 49 111.798 7.63 1.51742 52.4 50 -35.378 1.50 1.88300 40.8 51 -107.947 0.20 52 90.094 7.67 1.53996 59.5 53 -53.741 10.00 54 ∞ 33.00 1.60859 46.4 55 ∞ 13.20 1.51633 64.2 56 ∞ 13.30 Image plane ∞ Aspherical data Page 13 K = 1.99852e+00 A 4= 1.15677e-06 A 6=-2.75064e-08 A 8=-3.06848e-10 A10= 9.10515e-13 A12= 3.28486e-15 A14= 1.35261e-18 A16= 5.54400e-22 A 3= 2.74335e-07 A 5= 9.95673e-08 A 7= 4.02226e-09 A 9= 6.12079e-12 A11=-8.52506e-14 A13=-6.85632e-17 A15=-3.84859e-20 Page 21 K = 1.21093e+01 A 4= 2.82183e-07 A 6=-5.59441e-11 A 8=-2.00796e-14 A10= 9.78964e-17 A12=-6.30815e-20 A14= 1.70834e-23 A16=-4.73901e-27 A 3=-2.90901e-08 A 5= 1.58196e-09 A 7= 1.10620e-12 A 9=-1.50730e-15 A11= 5.86871e-20 A13= 1.04584e-22 A15= 1.44467e-25 Page 30 K =-2.23400e+02 A 4= 2.77687e-07 A 6= 4.69555e-10 A 8= 1.39733e-13 A10=-2.98156e-16 A12= 4.58582e-19 A14=-2.25443e-22 A16= 5.80568e-26 A 3= 1.70768e-07 A 5=-5.73181e-09 A 7=-1.36230e-11 A 9= 7.92918e-15 A11=-8.14405e-18 A13= 2.06016e-21 A15=-8.57551e-25 Various data Zoom ratio 120.00 Focal length 8.50 28.13 100.00 340.00 1020.00 F-number 1.75 1.75 1.75 1.75 5.25 Field of view 32.91 11.06 3.15 0.93 0.31 Image height 5.50 5.50 5.50 5.50 5.50 Lens length 678.72 678.72 678.72 678.72 678.72 BF 13.30 13.30 13.30 13.30 13.30 d12 3.47 94.70 154.53 185.25 194.08 d19 289.33 168.20 96.92 55.51 2.00 d25 4.21 21.63 10.30 4.08 4.50 d30 2.99 15.46 38.24 55.16 99.42 Zoom lens group data Group starting plane focal length 1 1 251.50 2 13 -24.07 3 20 134.62 4 26 112.37 5 31 41.15

[0061] [Table 1]

[0062] [Numerical Example 2] (A) Lens configuration 2-3: When the third optical unit 3 is inserted (high magnification state) Unit: mm Surface data Face number rd nd vd 1 -2942.188 6.00 1.83481 42.7 2 335.459 1.80 3 335.066 23.71 1.43387 95.1 4 -1057.929 0.20 5 525.299 14.68 1.43387 95.1 6 -2449.905 25.25 7 377.042 20.53 1.43387 95.1 8 -1365.497 0.25 9 306.954 16.16 1.43387 95.1 10 1716.232 1.50 11 188.244 16.19 1.43875 94.7 12 408.078 (variable) 13* -532.824 2.20 2.00330 28.3 14 38.132 11.72 15 -44.546 1.45 1.74320 49.3 16 72.565 9.77 1.89286 20.4 17 -46.484 1.63 18 -41.758 2.00 1.88300 40.8 19 -152.608 (variable) 20 152.336 11.49 1.72916 54.7 21* -265.715 6.62 22 139.888 13.50 1.43875 94.7 23 -246.304 0.50 24 264.094 2.60 1.85478 24.8 25 97.106 (Variable) 26 86.506 15.39 1.49700 81.5 27 -236.969 0.50 28 415.877 2.50 1.80518 25.4 29 139.362 7.85 1.60311 60.6 30* -764.201 (variable) 31 (aperture) ∞ 5.46 32 -100.588 1.40 1.88300 40.8 33 50.285 1.36 34 40.817 3.60 1.92286 18.9 35 96.042 4.19 36 -79.866 1.70 1.80400 46.5 37 -114.439 5.00 38 81.692 4.99 1.43875 94.7 39 -61.751 0.60 40 15.450 7.64 1.53172 48.8 41 65.646 0.90 2.00330 28.3 42 15.619 5.23 43 60.356 0.75 1.88300 40.8 44 12.180 5.75 1.74077 27.8 45 274.217 1.55 46 -51.817 0.70 1.81600 46.6 47 97.938 7.66 48 95.109 5.83 1.51742 52.4 49 -65.823 1.40 50 -142.700 1.50 1.88300 40.8 51 37.951 7.64 1.48749 70.2 52 -86.098 0.20 53 111.798 7.63 1.51742 52.4 54 -35.378 1.50 1.88300 40.8 55 -107.947 0.20 56 90.094 7.67 1.53996 59.5 57 -53.741 10.00 58 ∞ 33.00 1.60859 46.4 59 ∞ 13.20 1.51633 64.2 60 ∞ 13.30 Image plane ∞ Aspherical data Page 13 K = 1.99852e+00 A 4= 1.15677e-06 A 6=-2.75064e-08 A 8=-3.06848e-10 A10= 9.10515e-13 A12= 3.28486e-15 A14= 1.35261e-18 A16= 5.54400e-22 A 3= 2.74335e-07 A 5= 9.95673e-08 A 7= 4.02226e-09 A 9= 6.12079e-12 A11=-8.52506e-14 A13=-6.85632e-17 A15=-3.84859e-20 Page 21 K = 1.21093e+01 A 4= 2.82183e-07 A 6=-5.59441e-11 A 8=-2.00796e-14 A10= 9.78964e-17 A12=-6.30815e-20 A14= 1.70834e-23 A16=-4.73901e-27 A 3=-2.90901e-08 A 5= 1.58196e-09 A 7= 1.10620e-12 A 9=-1.50730e-15 A11= 5.86871e-20 A13= 1.04584e-22 A15= 1.44467e-25 Page 30 K =-2.23400e+02 A 4= 2.77687e-07 A 6= 4.69555e-10 A 8= 1.39733e-13 A10=-2.98156e-16 A12= 4.58582e-19 A14=-2.25443e-22 A16= 5.80568e-26 A 3= 1.70768e-07 A 5=-5.73181e-09 A 7=-1.36230e-11 A 9= 7.92918e-15 A11=-8.14405e-18 A13= 2.06016e-21 A15=-8.57551e-25 Various data Zoom ratio 120.00 Focal length 17.00 56.27 200.00 680.00 2039.99 F-number 3.50 3.50 3.50 3.50 10.50 Field of view: 17.93 5.58 1.58 0.46 0.15 Image height 5.50 5.50 5.50 5.50 5.50 Lens length 677.55 677.55 677.55 677.55 677.55 BF 13.30 13.30 13.30 13.30 13.30 d12 3.47 94.70 154.53 185.25 194.08 d19 289.33 168.20 96.92 55.51 2.00 d25 4.21 21.63 10.30 4.08 4.50 d30 2.99 15.46 38.24 55.16 99.42 Zoom lens group data Group starting plane focal length 1 1 251.50 2 13 -24.07 3 20 134.62 4 26 112.37 5 31 774.73

[0063] [Numerical Example 3] (A) Lens configuration 3-4: When the 4th optical unit 4 is inserted (blurred state) Unit: mm Surface data Face number rd nd vd 1 -2942.188 6.00 1.83481 42.7 2 335.459 1.80 3 335.066 23.71 1.43387 95.1 4 -1057.929 0.20 5 525.299 14.68 1.43387 95.1 6 -2449.905 25.25 7 377.042 20.53 1.43387 95.1 8 -1365.497 0.25 9 306.954 16.16 1.43387 95.1 10 1716.232 1.50 11 188.244 16.19 1.43875 94.7 12 408.078 (variable) 13* -532.824 2.20 2.00330 28.3 14 38.132 11.72 15 -44.546 1.45 1.74320 49.3 16 72.565 9.77 1.89286 20.4 17 -46.484 1.63 18 -41.758 2.00 1.88300 40.8 19 -152.608 (variable) 20 152.336 11.49 1.72916 54.7 21* -265.715 6.62 22 139.888 13.50 1.43875 94.7 23 -246.304 0.50 24 264.094 2.60 1.85478 24.8 25 97.106 (Variable) 26 86.506 15.39 1.49700 81.5 27 -236.969 0.50 28 415.877 2.50 1.80518 25.4 29 139.362 7.85 1.60311 60.6 30* -764.201 (variable) 31 (aperture) ∞ 5.46 32 -100.588 1.40 1.88300 40.8 33 50.285 1.36 34 40.817 3.60 1.92286 18.9 35 96.042 4.19 36 -79.866 1.70 1.80400 46.5 37 -114.439 7.69 38 502.742 1.50 1.80400 46.5 39 36.103 4.29 1.84666 23.9 40 140.382 6.83 41 -42.145 1.50 1.89190 37.1 42 104.586 8.12 1.51633 64.1 43 -29.853 12.96 44 95.109 5.83 1.51742 52.4 45 -65.823 1.40 46 -142.700 1.50 1.88300 40.8 47 37.951 7.64 1.48749 70.2 48 -86.098 0.20 49 111.798 7.63 1.51742 52.4 50 -35.378 1.50 1.88300 40.8 51 -107.947 0.20 52 90.094 7.67 1.53996 59.5 53 -53.741 10.00 54 ∞ 33.00 1.60859 46.4 55 ∞ 13.20 1.51633 64.2 56 ∞ 13.30 Image plane ∞ Aspherical data Page 13 K = 1.99852e+00 A 4= 1.15677e-06 A 6=-2.75064e-08 A 8=-3.06848e-10 A10= 9.10515e-13 A12= 3.28486e-15 A14= 1.35261e-18 A16= 5.54400e-22 A 3= 2.74335e-07 A 5= 9.95673e-08 A 7= 4.02226e-09 A 9= 6.12079e-12 A11=-8.52506e-14 A13=-6.85632e-17 A15=-3.84859e-20 Page 21 K = 1.21093e+01 A 4= 2.82183e-07 A 6=-5.59441e-11 A 8=-2.00796e-14 A10= 9.78964e-17 A12=-6.30815e-20 A14= 1.70834e-23 A16=-4.73901e-27 A 3=-2.90901e-08 A 5= 1.58196e-09 A 7= 1.10620e-12 A 9=-1.50730e-15 A11= 5.86871e-20 A13= 1.04584e-22 A15= 1.44467e-25 Page 30 K =-2.23400e+02 A 4= 2.77687e-07 A 6= 4.69555e-10 A 8= 1.39733e-13 A10=-2.98156e-16 A12= 4.58582e-19 A14=-2.25443e-22 A16= 5.80568e-26 A 3= 1.70768e-07 A 5=-5.73181e-09 A 7=-1.36230e-11 A 9= 7.92918e-15 A11=-8.14405e-18 A13= 2.06016e-21 A15=-8.57551e-25 Various data Zoom ratio 120.00 Focal length 8.50 28.13 100.00 340.01 1020.02 F-number 1.75 1.75 1.75 1.75 5.25 Field of view 32.90 11.06 3.15 0.93 0.31 Image height 5.50 5.50 5.50 5.50 5.50 Lens length 679.67 679.67 679.67 679.67 679.67 BF 13.30 13.30 13.30 13.30 13.30 d12 3.47 94.70 154.53 185.25 194.08 d19 289.33 168.20 96.92 55.51 2.00 d25 4.21 21.63 10.30 4.08 4.50 d30 2.99 15.46 38.24 55.16 99.42 d56 13.30 13.30 13.30 13.30 13.30 Zoom lens group data Group starting plane focal length 1 1 251.50 2 13 -24.07 3 20 134.62 4 26 112.37 5 31 40.37

[0064] [Table 2]

[0065] [Imaging device] Figure 9 shows the configuration of an imaging device (television camera system) using the lens device of each embodiment as the imaging optical system. In Figure 9, 101 is the imaging optical system as a lens device of any of Embodiments 1 to 3. 124 is the camera body. The imaging optical system 101 is detachable from the camera body 124. However, the imaging optical system 101 may be provided integrally with the camera body 124.

[0066] The imaging optical system 101 includes a first lens group F, a zoom section LZ, and a final lens group R for image formation. The first lens group F includes a sub-lens group that moves during focusing.

[0067] The zoom section LZ includes multiple lens groups that move during zooming. SP is the aperture diaphragm. 114 and 115 are drive mechanisms such as helicoids and cams that drive the first lens group F and the lens groups constituting the zoom section LZ in the optical axis direction, respectively. 116-118 are motors that drive the drive mechanisms 114 and 115 and the aperture diaphragm SP. 119-121 are detectors such as encoders, potentiometers, or photosensors for detecting the position of the first lens group F and the lens groups constituting the zoom section LZ in the optical axis direction, and the aperture diameter of the aperture diaphragm SP.

[0068] The camera body 124 includes a glass block 109 that corresponds to an optical filter or color separation optical system, and an image sensor 110 such as a CCD sensor or CMOS sensor that converts the subject image formed by the imaging optical system 101 into photoelectric data (imaging the subject through the imaging optical system 101).

[0069] 111 and 122 are control units such as a CPU that control the operation of the camera body 124 and the imaging optical system 101.

[0070] By using the lens devices of each embodiment as an imaging optical system, it is possible to realize an imaging device that can selectively capture images with different visual representations.

[0071] The disclosure of embodiments of the present invention includes the following configurations.

[0072] (Composition 1) A lens device having multiple lenses, A first optical unit consisting of some of the lenses of the plurality of lenses, A second optical unit consisting of some of the lenses of the aforementioned plurality of lenses, which is different from the first optical unit, It has a switching mechanism that allows switching between the first optical unit and the second optical unit. A lens device characterized in that the focal length of the first optical unit and the focal length of the second optical unit are equivalent.

[0073] (Configuration 2) The lens device according to configuration 1, characterized in that it has a third optical unit which is made up of some of the lenses of the plurality of lenses and has a focal length different from the focal length of the first optical unit and the focal length of the second optical unit.

[0074] (Composition 3) The lens device according to configuration 1 or 2, characterized in that the switching mechanism is a switching mechanism that switches the first optical unit and the second optical unit by rotation.

[0075] (Composition 4) A lens device according to any one of configurations 1 to 3, characterized in that the image representation obtained by the lens device into which the first optical unit is inserted is different from the image representation obtained by the lens device into which the second optical unit is inserted.

[0076] (Composition 5) The lens device according to any one of configurations 1 to 4, characterized in that the imaging device using the lens device into which the first optical unit is inserted captures a clear image, and the imaging device using the lens device into which the second optical unit is inserted captures a blurred image relative to the clear image.

[0077] (Composition 6) When the focal length of the first optical unit is fu1 and the focal length of the second optical unit is fu2, 0.95 <fu1 / fu2<1.05 A lens device according to any one of configurations 1 to 5, characterized by satisfying the following conditional expression.

[0078] (Composition 7) When the focal length of the first optical unit is fu1 and the focal length of the second optical unit is fu2 0.99 <fu1 / fu2<1.01 A lens device according to any one of configurations 1 to 5, characterized by satisfying the following conditional expression.

[0079] (Composition 8) The lens device according to any one of configurations 1 to 7, characterized in that the first optical unit and the second optical unit are part of a group of lenses that are arranged on the image side and do not move during zooming.

[0080] (Composition 9) A lens device according to any one of configurations 1 to 8, characterized in that the light rays transmitted when the first optical unit or the second optical unit is inserted are afocal.

[0081] (Composition 10) The lens device according to any one of configurations 1 to 9, characterized in that at least one of the radii of curvature, lens spacing, or refractive index of the lenses in the first optical unit and the second optical unit is different.

[0082] (Composition 11) A lens device according to any one of configurations 1 to 10, characterized in that the spherical aberration of the optical system when the first optical unit is inserted is different from the spherical aberration of the optical system when the second optical unit is inserted.

[0083] (Composition 12) A lens device according to any one of configurations 1 to 11, characterized in that, with respect to the spherical aberration of the optical system when the first optical unit is inserted, the spherical aberration of the optical system when the second optical unit is inserted is on the object side with respect to the light-receiving surface of the image sensor.

[0084] (Composition 13) When the pixel width of the image sensor that captures the image formed by the aforementioned lens device is p, and the spherical aberration is SA, -170 <SA / p<0 A lens device according to any one of configurations 1 to 12, characterized by satisfying the following conditional expression.

[0085] (Composition 14) When the pixel width of the image sensor that captures the image formed by the aforementioned lens device is p, and the spherical aberration is SA, -85 <SA / p<0 A lens device according to any one of configurations 1 to 12, characterized by satisfying the following conditional expression.

[0086] (Composition 15) A lens device according to any one of configurations 1 to 14, characterized in that the flange back position when the first optical unit is inserted is different from the flange back position when the second optical unit is inserted.

[0087] (Composition 16) The lens device according to configuration 15, characterized by having a flange back adjustment mechanism that can adjust the flange back position according to the optical unit to be inserted.

[0088] (Composition 17) The lens device according to configuration 15 or 16, characterized in that the flange back position when the second optical unit is inserted is on the object side with respect to the light-receiving surface of the image sensor.

[0089] (Composition 18) A lens device according to any one of configurations 15 to 17, characterized in that the flange back position changes according to the zoom, focus, and aperture state of the lens device.

[0090] (Composition 19) A lens device having multiple lenses, A first optical unit consisting of some of the lenses of the plurality of lenses, A second optical unit consisting of some of the lenses of the aforementioned plurality of lenses, which is different from the first optical unit, It has a switching mechanism that allows switching between the first optical unit and the second optical unit. A lens device characterized in that the image representation obtained by a lens device into which the first optical unit is inserted is different from the image representation obtained by a lens device into which the second optical unit is inserted.

[0091] (Composition 20) An imaging device characterized by having an image sensor that captures an image formed by a lens device described in any of configurations 1 to 19.

[0092] Although preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications and changes are possible within the scope of its essence. [Explanation of Symbols]

[0093] L1 First lens group L2 Second lens group L3 Third lens group L4 4th lens group L5 5th lens group SP aperture LL1, LL2, LL3 Optical Units

Claims

1. A lens device having multiple lenses, A first optical unit consisting of some of the lenses of the plurality of lenses, A second optical unit, which consists of some of the lenses of the plurality of lenses and is different from the first optical unit, It has a switching mechanism that allows switching between the first optical unit and the second optical unit, A lens device characterized in that the focal length of the first optical unit and the focal length of the second optical unit are equivalent.

2. The lens device according to claim 1, characterized in that it has a third optical unit which is made up of some of the lenses of the plurality of lenses and has a focal length different from the focal length of the first optical unit and the focal length of the second optical unit.

3. The lens device according to claim 1, characterized in that the switching mechanism is a switching mechanism that switches the first optical unit and the second optical unit by rotation.

4. The lens device according to claim 1, characterized in that the image representation obtained by the lens device into which the first optical unit is inserted is different from the image representation obtained by the lens device into which the second optical unit is inserted.

5. The lens device according to claim 1, characterized in that an imaging device using a lens device into which the first optical unit is inserted captures a clear image, and an imaging device using a lens device into which the second optical unit is inserted captures a blurred image relative to the clear image.

6. When the focal length of the first optical unit is fu1 and the focal length of the second optical unit is fu2, 0.95<fu1 / fu2<1.05 The lens device according to claim 1, characterized in that it satisfies the following condition.

7. When the focal length of the first optical unit is fu1 and the focal length of the second optical unit is fu2 0.99<fu1 / fu2<1.01 The lens device according to claim 1, characterized in that it satisfies the following condition.

8. The lens device according to claim 1, characterized in that the first optical unit and the second optical unit are part of a group of lenses that are arranged on the image side and do not move during zooming, among a plurality of lens groups in the lens device.

9. The lens device according to claim 1, characterized in that the light rays transmitted when the first optical unit or the second optical unit is inserted are afocal.

10. The lens device according to claim 1, characterized in that at least one of the radius of curvature, lens spacing, or refractive index of the lenses in the first optical unit and the second optical unit is different.

11. The lens device according to claim 1, characterized in that the spherical aberration of the optical system when the first optical unit is inserted is different from the spherical aberration of the optical system when the second optical unit is inserted.

12. The lens device according to claim 1, characterized in that, with respect to the spherical aberration of the optical system when the first optical unit is inserted, the spherical aberration of the optical system when the second optical unit is inserted is on the object side with respect to the light-receiving surface of the image sensor.

13. When the pixel width of the image sensor that captures the image formed by the aforementioned lens device is p, and the spherical aberration is SA, -170<SA / p<0 The lens device according to claim 1, characterized in that it satisfies the following condition.

14. When the pixel width of the image sensor that captures the image formed by the aforementioned lens device is p, and the spherical aberration is SA, -85<SA / p<0 The lens device according to claim 1, characterized in that it satisfies the following condition.

15. The lens device according to claim 1, characterized in that the flange back position when the first optical unit is inserted is different from the flange back position when the second optical unit is inserted.

16. The lens device according to claim 15, characterized in that it has a flange back adjustment mechanism capable of adjusting the flange back position according to the optical unit being inserted.

17. The lens device according to claim 15, characterized in that the flange back position when the second optical unit is inserted is on the object side with respect to the light-receiving surface of the image sensor.

18. The lens device according to claim 15, characterized in that the flange back position changes according to the zoom, focus, and aperture state of the lens device.

19. A lens device having multiple lenses, A first optical unit consisting of some of the lenses of the plurality of lenses, A second optical unit, which consists of some of the lenses of the plurality of lenses and is different from the first optical unit, It has a switching mechanism that allows switching between the first optical unit and the second optical unit, A lens device characterized in that the image representation obtained by a lens device into which the first optical unit is inserted is different from the image representation obtained by a lens device into which the second optical unit is inserted.

20. An imaging device characterized by having an image sensor that captures an image formed by a lens device according to any one of claims 1 to 19.

Images