WO2023210318A1 - 結像レンズおよび顕微鏡装置 - Google Patents
結像レンズおよび顕微鏡装置 Download PDFInfo
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- WO2023210318A1 WO2023210318A1 PCT/JP2023/014513 JP2023014513W WO2023210318A1 WO 2023210318 A1 WO2023210318 A1 WO 2023210318A1 JP 2023014513 W JP2023014513 W JP 2023014513W WO 2023210318 A1 WO2023210318 A1 WO 2023210318A1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/025—Mountings, adjusting means, or light-tight connections, for optical elements for lenses using glue
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/143—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only
- G02B15/1431—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only the first group being positive
- G02B15/143105—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only the first group being positive arranged +-+
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B21/00—Microscopes
- G02B21/02—Objectives
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B21/00—Microscopes
- G02B21/02—Objectives
- G02B21/04—Objectives involving mirrors
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/0025—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for optical correction, e.g. distorsion, aberration
- G02B27/005—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for optical correction, e.g. distorsion, aberration for correction of secondary colour or higher-order chromatic aberrations
- G02B27/0062—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for optical correction, e.g. distorsion, aberration for correction of secondary colour or higher-order chromatic aberrations by controlling the dispersion of a lens material, e.g. adapting the relative partial dispersion
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/021—Mountings, adjusting means, or light-tight connections, for optical elements for lenses for more than one lens
Definitions
- the present invention relates to an imaging lens and a microscope device.
- the imaging lens according to the first aspect of the present invention is an imaging lens for a microscope that forms an image of light from an objective lens, and includes a negative lens and a positive lens that satisfies the following conditional expression. -0.002 ⁇ ( ⁇ dP-35)+0.602- ⁇ gFP ⁇ 0 23 ⁇ dP ⁇ 65
- ⁇ dP is the Abbe number of the positive lens
- ⁇ gFP is the partial dispersion ratio of the positive lens
- the refractive index of the positive lens for the g-line is ngP
- the refractive index of the positive lens for the F-line is nFP
- the positive lens is
- the imaging lens according to the second aspect of the present invention is an imaging lens for a microscope that forms an image of light from an objective lens, and includes a positive lens and a negative lens that satisfies the following conditional expression. -0.0033 ⁇ ( ⁇ dN-35)+0.593- ⁇ gFN ⁇ 0 20 ⁇ dN ⁇ 37
- ⁇ dN Abbe number of the negative lens
- ⁇ gFN partial dispersion ratio of the negative lens
- the refractive index of the negative lens for the g-line is ngN
- the refractive index of the negative lens for the F-line is nFN
- the microscope device includes an objective lens that receives light from an object and converts it into parallel light, and the above-mentioned imaging lens.
- FIG. 1 is a cross-sectional view showing the configuration of an imaging lens according to a first example.
- FIG. 3 is a diagram showing various aberrations of the imaging lens according to the first example.
- FIG. 3 is a chromatic aberration diagram of the imaging lens according to the first example.
- FIG. 3 is a coma aberration diagram of the imaging lens according to the first example.
- FIG. 3 is a cross-sectional view showing the configuration of an imaging lens according to a second example.
- FIG. 7 is a diagram showing various aberrations of an imaging lens according to a second example.
- FIG. 7 is a chromatic aberration diagram of an imaging lens according to a second example.
- FIG. 7 is a coma aberration diagram of an imaging lens according to a second example.
- FIG. 1 is a cross-sectional view showing the configuration of an imaging lens according to a first example.
- FIG. 3 is a diagram showing various aberrations of the imaging lens according to the first example.
- FIG. 7 is a cross-sectional view showing the configuration of an imaging lens according to a third example.
- FIG. 7 is a diagram showing various aberrations of an imaging lens according to a third example.
- FIG. 7 is a chromatic aberration diagram of an imaging lens according to a third example.
- FIG. 7 is a coma aberration diagram of an imaging lens according to a third example.
- FIG. 7 is a cross-sectional view showing the configuration of an imaging lens according to a fourth example.
- FIG. 7 is a diagram showing various aberrations of an imaging lens according to a fourth example.
- FIG. 7 is a chromatic aberration diagram of an imaging lens according to a fourth example. It is a coma aberration diagram of the imaging lens based on 4th Example.
- FIG. 7 is a diagram showing various aberrations of an imaging lens according to a third example.
- FIG. 7 is a chromatic aberration diagram of an imaging lens according to a third example.
- It is a
- FIG. 7 is a cross-sectional view showing the configuration of an imaging lens according to a fifth example.
- FIG. 7 is a diagram showing various aberrations of an imaging lens according to a fifth example. It is a chromatic aberration diagram of the imaging lens based on 5th Example. It is a coma aberration diagram of the imaging lens based on 5th Example. 1 is a schematic configuration diagram showing a confocal fluorescence microscope, which is an example of a microscope device.
- the confocal fluorescence microscope 1 includes an excitation light introduction section 2 that guides illumination laser light from a light source unit 6 onto the sample SA, and an excitation light introduction section 2 that deflects the laser light focused onto the sample SA.
- Consisting of a scanning device 3 that scans on the sample SA, a photodetection device 5 that detects a light intensity signal from the sample SA, and a condensing optical system 4 that guides the light from the sample SA to the photodetection device 5. be done.
- the light source unit 6 may be provided in the confocal fluorescence microscope 1 or may be provided separately from the confocal fluorescence microscope 1.
- the light source unit 6 includes a laser light source (not shown), a beam diameter adjustment mechanism (not shown), and the like.
- the light source unit 6 oscillates a laser beam for illumination.
- the excitation light introducing section 2 includes a collimator lens 21 , a dichroic mirror 22 , and a microscope optical system 25 having an imaging lens 23 and an objective lens 24 .
- the collimator lens 21 and the dichroic mirror 22 are arranged inside the microscope housing section 12 provided above the lens barrel section 11 of the microscope main body 10. Note that the light source unit 6 and the microscope housing section 12 are connected by an optical fiber 69 using connectors C3 and C4.
- the collimator lens 21 converts the laser beam (luminous flux) oscillated from the light source unit 6 into parallel light.
- Dichroic mirror 22 reflects the laser beam from collimator lens 21 toward sample SA.
- the microscope optical system 25 uses an imaging lens 23 and an objective lens 24 to focus the laser light reflected by the dichroic mirror 22 onto the sample SA.
- the imaging lens 23 is disposed inside the lens barrel section 11 of the microscope main body 10. Note that the imaging lens 23 is also referred to as a second objective lens.
- the objective lens 24 is attached to the lower part of the lens
- the scanning device 3 includes a scanning mechanism (scanner) 31 and a scanning optical system 32.
- the scanning device 3 is arranged between the dichroic mirror 22 and the imaging lens 23 inside the microscope housing 12 .
- the scanning mechanism (scanner) 31 includes, for example, a galvano mirror (not shown) or a resonant mirror (not shown).
- a scanning mechanism (scanner) 31 deflects an incident laser beam. That is, the scanning mechanism (scanner) 31 deflects the laser beam focused on the sample SA and scans the sample SA.
- the scanning optical system 32 is an optical system provided between the scanning mechanism (scanner) 31 and the imaging lens 23. Further, the scanning optical system 32 is an optical system in which the focal position of the scanning optical system 32 is located on an imaging plane 13 (also referred to as a primary image plane) that is conjugate with the sample SA (scanning plane of the sample SA).
- the condensing optical system 4 includes an objective lens 24 and an imaging lens 23 that constitute the microscope optical system 25, a total reflection mirror 41, and a condensing lens 42.
- the objective lens 24 receives the fluorescence generated in the sample SA and converts it into parallel light.
- the imaging lens 23 once focuses the fluorescence (parallel light) emitted from the objective lens 24 onto the imaging plane 13 (primary image plane) to form an image.
- the fluorescence from the sample SA that has passed through the objective lens 24 and the imaging lens 23 is once focused on the imaging surface 13, passes through the scanning device 3 and the dichroic mirror 22, and reaches the total reflection mirror 41.
- the total reflection mirror 41 and the condensing lens 42 are arranged above the dichroic mirror 22 inside the microscope housing section 12 .
- the total reflection mirror 41 reflects the fluorescence from the sample SA that has passed through the objective lens 24 and the imaging lens 23.
- the condensing lens 42 condenses the fluorescence reflected by the total reflection mirror 41 onto a light shielding plate 52 having a pinhole 51 (aperture).
- the photodetector 5 includes a light shielding plate 52 having a pinhole 51, an optical fiber 53, and a detection unit 55.
- the optical fiber 53 is connected to the microscope housing 12 and the detection unit 55 using connectors C1 and C2.
- the light (fluorescence) that has passed through the pinhole 51 is incident on the optical fiber 53 .
- the detection unit 55 detects the light (fluorescence) that has passed through the pinhole 51 and the optical fiber 53.
- a processing unit 57 is electrically connected to the detection unit 55 via a cable 56 .
- the processing unit 57 performs image processing (of the sample SA) based on the detection signal detected by the detection unit 55, and the observed image of the sample SA obtained by the image processing of the processing unit 57 is displayed on a monitor (not shown).
- the laser beam from the scanning device 3 is once focused on the imaging plane 13 (primary image plane), and is again focused on the sample SA by the imaging lens 23 and objective lens 24 of the microscope optical system 25. It is configured as follows. That is, the scanning plane of the sample SA, the imaging plane 13, and the pinhole 51 are in a conjugate relationship with each other. Therefore, by condensing the light onto the sample SA using the imaging lens 23 and the objective lens 24, out of the light (fluorescence) from the sample SA, the fluorescence generated on the scanning surface of the sample SA can be absorbed through the pinhole. 51.
- the confocal fluorescence microscope 1 has been described as an example of the microscope apparatus according to the present embodiment, the present invention is not limited to this.
- the microscope device according to this embodiment may be a multiphoton excitation microscope, a super resolution microscope, or the like.
- the confocal fluorescence microscope 1 may be an upright microscope or an inverted microscope.
- the imaging lens 23 provided in such a confocal fluorescence microscope 1 (microscope device), it is possible to use the imaging lens IL described below. First, the imaging lens IL according to the first embodiment will be described.
- the imaging lens IL (1) shown in FIG. 1 includes a negative lens and a positive lens ( L13). -0.002 ⁇ ( ⁇ dP-35)+0.602- ⁇ gFP ⁇ 0...(1) 23 ⁇ dP ⁇ 65...(2)
- ⁇ dP Abbe number of the positive lens
- ⁇ gFP partial dispersion ratio of the positive lens
- the refractive index of the positive lens for the g-line is ngP
- the refractive index of the positive lens for the F-line is nFP
- the refractive index of the positive lens for the C-line is
- the imaging lens IL according to the first embodiment may be the imaging lens IL(2) shown in FIG. 5, the imaging lens IL(3) shown in FIG. 9, or the imaging lens IL(4) shown in FIG. ), or the imaging lens IL(5) shown in FIG. 17 may be used.
- Conditional expression (1) appropriately defines the anomalous dispersion of the positive lens. By satisfying conditional expression (1), it is possible to satisfactorily correct the secondary spectrum of longitudinal chromatic aberration.
- conditional expression (1) falls outside the above range, it becomes difficult to correct the secondary spectrum of longitudinal chromatic aberration.
- the upper limit of conditional expression (1) may be set to -0.05, or further to -0.025.
- Conditional expression (2) defines an appropriate range of the Abbe number of the positive lens. By satisfying conditional expression (2), it is possible to satisfactorily correct the first-order longitudinal chromatic aberration.
- conditional expression (2) falls outside the above range, it becomes difficult to correct the first-order longitudinal chromatic aberration.
- the upper limit of conditional expression (2) 60, 55, 50, 45, 40, or even 35, the effects of this embodiment can be made more reliable.
- the lower limit of conditional expression (2) 23.5, 24, or even 24.5, the effects of this embodiment can be made more reliable.
- the positive lens may satisfy the following conditional expression (3). 1.55 ⁇ ndP ⁇ 1.79...(3)
- ndP refractive index for the d-line of the positive lens
- Conditional expression (3) defines an appropriate range of the refractive index of the positive lens for the d-line. By satisfying conditional expression (3), field curvature can be favorably corrected.
- conditional expression (3) If the corresponding value of conditional expression (3) exceeds the upper limit, the difference in refractive index between the lens adjacent to the positive lens and the positive lens becomes large, making it difficult to correct spherical aberration.
- the upper limit of conditional expression (3) By setting the upper limit of conditional expression (3) to 1.78, and further to 1.76, the effects of this embodiment can be made more reliable.
- conditional expression (3) When the corresponding value of conditional expression (3) exceeds the lower limit value, the refractive index of the positive lens for the d-line becomes low, and the term related to the positive lens in the Petzval sum increases, making it difficult to correct the curvature of field. .
- the lower limit of conditional expression (3) By setting the lower limit of conditional expression (3) to 1.58, and further to 1.60, the effects of this embodiment can be made more reliable.
- the positive lens may satisfy the following conditional expression (4). 0.4 ⁇ fP/f ⁇ 1.2 (4)
- fP Focal length of positive lens
- f Focal length of imaging lens IL
- Conditional expression (4) defines an appropriate relationship between the focal length of the positive lens and the focal length of the imaging lens IL. By satisfying conditional expression (4), it is possible to satisfactorily correct the secondary spectrum of longitudinal chromatic aberration.
- conditional expression (4) When the corresponding value of conditional expression (4) exceeds the upper limit, the refractive power of the positive lens becomes small, making it difficult to correct the secondary spectrum of longitudinal chromatic aberration.
- the upper limit of conditional expression (4) By setting the upper limit of conditional expression (4) to 1.15, and further to 1.1, the effects of this embodiment can be made more reliable.
- conditional expression (4) If the corresponding value of conditional expression (4) is below the lower limit value, the refractive power of the positive lens increases, resulting in excessive correction of the secondary spectrum of longitudinal chromatic aberration, resulting in poor correction of the secondary spectrum of longitudinal chromatic aberration. becomes difficult to do.
- the lower limit of conditional expression (4) By setting the lower limit of conditional expression (4) to 0.41 and further to 0.42, the effects of this embodiment can be made more reliable.
- the imaging lens IL according to the second embodiment has the same configuration as the imaging lens IL according to the first embodiment, and therefore will be described using the same reference numerals as those in the first embodiment.
- the imaging lens IL (1) shown in FIG. 1 includes a positive lens and a negative lens ( L21). -0.0033 ⁇ ( ⁇ dN-35)+0.593- ⁇ gFN ⁇ 0...(5) 20 ⁇ dN ⁇ 37...(6)
- ⁇ dN Abbe number of the negative lens
- ⁇ gFN partial dispersion ratio of the negative lens
- the refractive index of the negative lens for the g-line is ngN
- the refractive index of the negative lens for the F-line is nFN
- the refractive index of the negative lens for the C-line is
- the imaging lens IL according to the second embodiment may be the imaging lens IL(2) shown in FIG. 5, the imaging lens IL(3) shown in FIG. 9, or the imaging lens IL(4) shown in FIG. ), or the imaging lens IL(5) shown in FIG. 17 may be used.
- Conditional expression (5) appropriately defines the anomalous dispersion of the negative lens. By satisfying conditional expression (5), it is possible to satisfactorily correct the secondary spectrum of lateral chromatic aberration.
- conditional expression (5) falls outside the above range, it becomes difficult to correct the secondary spectrum of lateral chromatic aberration.
- the upper limit of conditional expression (5) may be set to -0.05, or further to -0.025.
- Conditional expression (6) defines an appropriate range of the Abbe number of the negative lens. By satisfying conditional expression (6), it is possible to satisfactorily correct the first-order lateral chromatic aberration.
- conditional expression (6) falls outside the above range, it becomes difficult to correct the first-order lateral chromatic aberration.
- the effects of this embodiment can be made more reliable.
- the lower limit of conditional expression (6) to 23.5, 24, or even 24.5, the effects of this embodiment can be made more reliable.
- the negative lens may satisfy the following conditional expression (7).
- ndN refractive index for the d-line of the negative lens
- Conditional expression (7) defines an appropriate range of the refractive index of the negative lens for the d-line. By satisfying conditional expression (7), field curvature can be favorably corrected.
- conditional expression (7) If the corresponding value of conditional expression (7) exceeds the upper limit, the refractive index of the negative lens for the d-line becomes high, and the term related to the positive lens in the Petzval sum cannot be canceled sufficiently, so the curvature of field must be corrected. becomes difficult.
- the upper limit of conditional expression (7) By setting the upper limit of conditional expression (7) to 1.77, and further to 1.76, the effects of this embodiment can be made more reliable. Further, the lower limit value of conditional expression (7) may be set to 1.57, or further to 1.58.
- the negative lens may satisfy the following conditional expression (8). -1.1 ⁇ fN/f ⁇ -0.2 (8) However, fN: Focal length of negative lens f: Focal length of imaging lens IL
- Conditional expression (8) defines an appropriate relationship between the focal length of the negative lens and the focal length of the imaging lens IL. By satisfying conditional expression (8), field curvature can be favorably corrected.
- conditional expression (8) exceeds the upper limit, the focal length of the negative lens becomes short and the term related to the positive lens in the Petzval sum is canceled out excessively, making it difficult to correct the curvature of field. .
- the upper limit of conditional expression (8) By setting the upper limit of conditional expression (8) to -0.22, and further to -0.24, the effects of this embodiment can be made more reliable.
- conditional expression (8) If the corresponding value of conditional expression (8) is below the lower limit value, the focal length of the negative lens becomes long, and the term related to the positive lens in the Petzval sum cannot be canceled sufficiently, making it difficult to correct the curvature of field. Become.
- the lower limit of conditional expression (8) By setting the lower limit of conditional expression (8) to -1.05, the effects of this embodiment can be made more reliable.
- the negative lens may satisfy the above-mentioned conditional expression (5).
- conditional expression (5) it is possible to satisfactorily correct the secondary spectrum of lateral chromatic aberration, as in the case of the second embodiment.
- the upper limit of conditional expression (5) may be set to -0.0005, and further to -0.001, the effects of this embodiment can be made more reliable.
- the lower limit value of conditional expression (5) may be set to -0.05, or further to -0.025.
- the negative lens may satisfy the above-mentioned conditional expression (6).
- conditional expression (6) it is possible to satisfactorily correct the first-order chromatic aberration of magnification, as in the case of the second embodiment.
- the upper limit of conditional expression (6) 36.5, 36, or even 35.5
- the effects of this embodiment can be made more reliable.
- the lower limit of conditional expression (6) 23.5, 24, or even 24.5, the effects of this embodiment can be made more reliable.
- the negative lens may satisfy the above-mentioned conditional expression (7).
- conditional expression (7) it is possible to satisfactorily correct field curvature, as in the second embodiment.
- the upper limit of conditional expression (7) may be set to 1.77, or further to 1.58.
- the negative lens may satisfy the above-mentioned conditional expression (8).
- conditional expression (8) it is possible to satisfactorily correct field curvature, as in the case of the second embodiment.
- the effects of this embodiment can be made more reliable.
- the lower limit of conditional expression (8) By setting the lower limit of conditional expression (8) to -1.05, the effects of this embodiment can be made more reliable.
- the imaging lens IL according to the first embodiment and the second embodiment may satisfy the following conditional expression (9). 0.2 ⁇ Bf/TL ⁇ 0.6 (9) However, Bf: Back focus of the imaging lens IL TL: Total length of the imaging lens IL
- Conditional expression (9) defines an appropriate relationship between the back focus of the imaging lens IL and the total length of the imaging lens IL.
- the total length of the imaging lens IL indicates the distance on the optical axis from the lens surface closest to the image side of the objective lens to the image plane I.
- conditional expression (9) If the corresponding value of conditional expression (9) exceeds the upper limit, it is necessary to increase the telephoto ratio by increasing the refractive power of the positive lens and the refractive power of the negative lens, so it is necessary to correct field curvature and coma aberration. becomes difficult.
- the upper limit of conditional expression (9) By setting the upper limit of conditional expression (9) to 0.55, and further to 0.5, the effects of each embodiment can be made more reliable.
- conditional expression (9) If the corresponding value of conditional expression (9) is below the lower limit, it becomes difficult to arrange an optical element such as a prism or a half mirror on the object side of the imaging lens IL.
- the lower limit of conditional expression (9) By setting the lower limit of conditional expression (9) to 0.21 and further to 0.22, the effects of each embodiment can be made more reliable.
- the imaging lens IL according to the first embodiment and the second embodiment includes a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a second lens group G2 having a positive refractive power. It is preferable that the second lens group G2 consists of one lens component having negative refractive power, and the third lens group G3 consists of one lens component having positive refractive power. . Note that in each embodiment, the lens component represents a single lens or a cemented lens. This results in a symmetrical lens arrangement, so astigmatism can be corrected well.
- the imaging lens IL according to the first embodiment and the second embodiment may satisfy the following conditional expression (10). 0.45 ⁇ f1/f3 ⁇ 2.4 (10) However, f1: Focal length of the first lens group G1 f3: Focal length of the third lens group G3
- Conditional expression (10) defines an appropriate relationship between the focal length of the first lens group G1 and the focal length of the third lens group G3. By satisfying conditional expression (10), it becomes possible to make the imaging lens IL compact, and to widen the field of view and increase the numerical aperture.
- conditional expression (10) exceeds the upper limit, the refractive power of the third lens group G3 becomes too strong, making it difficult to downsize the imaging lens IL, which is not preferable.
- the upper limit of conditional expression (10) is 2.35, and further to 2.3, the effects of each embodiment can be made more reliable.
- conditional expression (10) If the corresponding value of conditional expression (10) is below the lower limit, the refractive power of the first lens group G1 becomes too strong, making it difficult to correct astigmatism, off-axis coma, and distortion.
- the lower limit of conditional expression (10) By setting the lower limit of conditional expression (10) to 0.48 and further to 0.50, the effects of each embodiment can be made more reliable.
- the imaging lens IL according to the first embodiment and the second embodiment may satisfy the following conditional expression (11). -2.5 ⁇ f1/f2 ⁇ -0.6 (11) However, f1: Focal length of the first lens group G1 f2: Focal length of the second lens group G2
- Conditional expression (11) defines an appropriate relationship between the focal length of the first lens group G1 and the focal length of the second lens group G2. By satisfying conditional expression (11), it becomes possible to make the imaging lens IL compact, and to widen the field of view and increase the numerical aperture.
- conditional expression (11) exceeds the upper limit, the refractive power of the second lens group G2 becomes too weak, making it difficult to downsize the imaging lens IL, which is not preferable.
- the upper limit of conditional expression (11) By setting the upper limit of conditional expression (11) to -0.7, and further to -0.8, the effects of each embodiment can be made more reliable.
- conditional expression (11) If the corresponding value of conditional expression (11) is below the lower limit, the refractive power of the second lens group G2 becomes too strong, making it difficult to correct field curvature and off-axis coma aberration.
- the lower limit of conditional expression (11) By setting the lower limit of conditional expression (11) to -2.4, and further to -2.3, the effects of each embodiment can be made more reliable.
- the following conditional expression (12) may be satisfied. 0.3 ⁇ DA/TL ⁇ 0.6 (12)
- DA Distance on the optical axis from the lens surface closest to the image side of the objective lens to the lens surface closest to the object side of the imaging lens IL
- TL Total length of the imaging lens IL
- Conditional expression (12) defines an appropriate relationship between the distance on the optical axis from the lens surface closest to the image side of the objective lens to the lens surface closest to the object side of the imaging lens IL, and the total length of the imaging lens IL. It is something.
- an optical element such as a prism or a half mirror on the object side of the imaging lens IL, so that, for example, microscopic observation using a microscope device as a confocal fluorescence microscope is possible. This makes it possible to easily switch to microscopic observation using the microscope device as a stereomicroscope.
- conditional expression (12) exceeds the upper limit, the diameter of each lens in the imaging lens IL becomes large, and it becomes difficult to ensure a sufficient back focus.
- the upper limit of conditional expression (12) By setting the upper limit of conditional expression (12) to 0.55, 0.5, or even 0.48, the effects of each embodiment can be made more reliable.
- conditional expression (12) If the corresponding value of conditional expression (12) is below the lower limit, it becomes difficult to arrange an optical element such as a prism or a half mirror on the object side of the imaging lens IL.
- the lower limit of conditional expression (12) By setting the lower limit of conditional expression (12) to 0.35, and further to 0.38, the effects of each embodiment can be made more reliable.
- the following conditional expression (13) may be satisfied. 0.1 ⁇ FDN/f ⁇ 0.18 (13)
- FDN Number of fields of view of the microscope device
- f Focal length of the imaging lens IL
- Conditional expression (13) defines an appropriate relationship between the number of fields of view of the microscope device and the focal length of the imaging lens IL. By satisfying conditional expression (13), it is possible to satisfactorily correct spherical aberration and coma aberration in a wide field of view.
- conditional expression (13) When the corresponding value of conditional expression (13) exceeds the upper limit value, it becomes difficult to correct spherical aberration and coma aberration.
- the upper limit of conditional expression (13) By setting the upper limit of conditional expression (13) to 0.17, the effects of each embodiment can be made more reliable.
- conditional expression (13) If the corresponding value of conditional expression (13) is below the lower limit, sufficient magnification will not be obtained and the field of view will become narrow, which is not preferable.
- the lower limit of conditional expression (13) By setting the lower limit of conditional expression (13) to 0.11, the effects of each embodiment can be made more reliable.
- FIG. 5, FIG. 9, FIG. 13, and FIG. 17 are cross-sectional views showing the configuration and refractive power distribution of the imaging lenses IL ⁇ IL(1) to IL(5) ⁇ according to the first to fifth embodiments.
- each lens group is represented by a combination of the symbol G and a number (or alphabet)
- each lens is represented by a combination of the symbol L and a number (or alphabet).
- lens components and the like are expressed using combinations of codes and numbers independently for each embodiment. Therefore, even if the same combination of symbols and numbers is used between the embodiments, it does not mean that they have the same configuration.
- Tables 1 to 5 are shown below, of which Table 1 is the first example, Table 2 is the second example, Table 3 is the third example, Table 4 is the fourth example, and Table 5 is the fourth example. It is a table showing each specification data in 5 Examples.
- the s-line 851.1 nm) is selected.
- f indicates the focal length of the imaging lens.
- FNO indicates the F number of the imaging lens.
- NA indicates the numerical aperture of the imaging lens, and Bf indicates the back focus of the imaging lens.
- TL indicates the total length of the imaging lens (the distance on the optical axis from the lens surface closest to the image side of the objective lens to the image surface).
- DA indicates the distance on the optical axis from the lens surface of the objective lens closest to the image side to the lens surface of the imaging lens closest to the object side.
- FDN indicates the number of fields of view of the microscope device.
- the surface number indicates the order of the lens surfaces from the object side.
- R indicates the radius of curvature of each optical surface (the surface whose center of curvature is located on the image plane side is a positive value).
- D indicates the surface spacing, which is the distance on the optical axis from each optical surface to the next optical surface (or image surface).
- ⁇ d represents the Abbe number based on the d-line of the material of the optical member.
- nd indicates the refractive index of the material of the optical member for the d-line.
- the partial dispersion ratio ⁇ gF of the material of the optical member is defined by the following formula (A).
- the [Lens group data] table shows the starting surface (the surface closest to the object) and focal length of each lens group.
- the focal length f, radius of curvature R, surface spacing D, and other lengths are generally expressed in mm unless otherwise specified, but the optical system is proportionally enlarged. Alternatively, even if the optical performance is proportionally reduced, the same optical performance can be obtained, so the present invention is not limited to this.
- FIG. 2 is a sectional view showing the configuration of the imaging lens according to the first example.
- the imaging lens IL (1) according to the first embodiment includes a first lens group G1 having a positive refractive power and a second lens group having a negative refractive power, which are arranged in order from the object side along the optical axis. G2, and a third lens group G3 having positive refractive power.
- the entrance pupil plane P of the imaging lens IL(1) corresponds to the exit pupil plane of the infinity correction type objective lens 24.
- the image plane I corresponds to the image plane 13 described above. This also applies to all the examples below.
- the first lens group G1 includes a biconvex positive lens L11, a positive meniscus lens L12 with a convex surface facing the object side, a biconvex positive lens L13, and a biconcave positive lens L11 arranged in order from the object side along the optical axis. It is composed of a cemented lens in which a negative lens L14 of the shape is cemented.
- the positive lens L13 of the cemented lens in the first lens group G1 corresponds to a positive lens that satisfies the above-mentioned conditional expression (1).
- the second lens group G2 is composed of a negative meniscus lens L21 with a convex surface facing the object side.
- the negative meniscus lens L21 in the second lens group G2 corresponds to a negative lens that satisfies the above-mentioned conditional expression (5).
- the third lens group G3 is composed of a positive meniscus lens L31 with a convex surface facing the object side.
- An image plane I is arranged on the image side of the third lens group G3.
- Table 1 below lists the values of the specifications of the imaging lens according to the first example. Note that the first surface is the entrance pupil plane P of the imaging lens.
- FIG. 2 is a diagram showing various aberrations (spherical aberration, field curvature, and distortion aberration) of the imaging lens according to the first example.
- FIG. 3 is a diagram showing lateral chromatic aberration (lateral chromatic aberration) of the imaging lens according to the first example.
- FIG. 4 is a diagram showing coma aberration (meridional coma aberration and sagittal coma aberration) of the imaging lens according to the first example.
- g g.
- the vertical axis indicates a value normalized with the maximum value of the entrance pupil radius as 1, and the horizontal axis indicates the aberration value [mm] for each light ray.
- solid lines indicate sagittal image planes for each wavelength, and broken lines indicate meridional image planes for each wavelength.
- the vertical axis shows the image height [mm]
- the horizontal axis shows the aberration value [mm].
- the vertical axis indicates the image height [mm]
- the horizontal axis indicates the aberration ratio in percentage (% value).
- the vertical axis shows the image height [mm]
- the horizontal axis shows the aberration value [mm].
- Each coma aberration diagram shows aberration values when the image height ratio RFH (Relative Field Height) is 0.00 and 1.00. Note that in the aberration diagrams of each example shown below, the same symbols as in this example are used, and overlapping explanations are omitted.
- the imaging lens according to the first example has excellent optical performance, with various aberrations including chromatic aberration being well corrected in a wide wavelength range.
- FIG. 5 is a sectional view showing the configuration of an imaging lens according to the second embodiment.
- the imaging lens IL (2) according to the second embodiment includes a first lens group G1 having a positive refractive power and a second lens group having a negative refractive power, which are arranged in order from the object side along the optical axis. G2, and a third lens group G3 having positive refractive power.
- the first lens group G1 includes a biconvex positive lens L11, a positive meniscus lens L12 with a convex surface facing the object side, and a positive meniscus lens L12 with a convex surface facing the object side, which are arranged in order from the object side along the optical axis. It is composed of a cemented lens in which a lens L13 and a negative meniscus lens L14 having a convex surface facing the object are cemented.
- the positive meniscus lens L13 which is a cemented lens in the first lens group G1, corresponds to a positive lens that satisfies the above-mentioned conditional expression (1).
- the second lens group G2 is composed of a biconcave negative lens L21.
- the negative lens L21 in the second lens group G2 corresponds to a negative lens that satisfies the above-mentioned conditional expression (5) and the like.
- the third lens group G3 is composed of a biconvex positive lens L31.
- An image plane I is arranged on the image side of the third lens group G3.
- Table 2 below lists the values of the specifications of the imaging lens according to the second example. Note that the first surface is the entrance pupil plane P of the imaging lens.
- FIG. 6 is a diagram showing various aberrations (spherical aberration, field curvature, and distortion aberration) of the imaging lens according to the second example.
- FIG. 7 is a diagram showing the lateral chromatic aberration (lateral chromatic aberration) of the imaging lens according to the second example.
- FIG. 8 is a diagram showing coma aberration (meridional coma aberration and sagittal coma aberration) of the imaging lens according to the second example. From each aberration diagram, it can be seen that the imaging lens according to the second example has excellent optical performance, with various aberrations including chromatic aberration being well corrected over a wide wavelength range.
- FIG. 9 is a sectional view showing the configuration of an imaging lens according to the third example.
- the imaging lens IL (3) according to the third embodiment includes a first lens group G1 having a positive refractive power and a second lens group having a negative refractive power, which are arranged in order from the object side along the optical axis. G2, and a third lens group G3 having positive refractive power.
- the first lens group G1 includes a biconvex positive lens L11, a positive meniscus lens L12 with a convex surface facing the object side, a biconvex positive lens L13, and a biconvex positive lens L11, which are arranged in order from the object side along the optical axis. It is composed of a cemented lens in which a concave negative lens L14 is cemented.
- the positive lens L13 of the cemented lens in the first lens group G1 corresponds to a positive lens that satisfies the above-mentioned conditional expression (1).
- the second lens group G2 is composed of a biconcave negative lens L21.
- the negative lens L21 in the second lens group G2 corresponds to a negative lens that satisfies the above-mentioned conditional expression (5) and the like.
- the third lens group G3 is composed of a biconvex positive lens L31.
- An image plane I is arranged on the image side of the third lens group G3.
- Table 3 lists the values of the specifications of the imaging lens according to the third example. Note that the first surface is the entrance pupil plane P of the imaging lens.
- FIG. 10 is a diagram showing various aberrations (spherical aberration, field curvature, and distortion aberration) of the imaging lens according to the third example.
- FIG. 11 is a diagram showing the lateral chromatic aberration (lateral chromatic aberration) of the imaging lens according to the third example.
- FIG. 12 is a diagram showing coma aberration (meridional coma aberration and sagittal coma aberration) of the imaging lens according to the third example. From each aberration diagram, it can be seen that the imaging lens according to the third example has excellent optical performance, with various aberrations including chromatic aberration being well corrected over a wide wavelength range.
- FIG. 13 is a sectional view showing the configuration of an imaging lens according to the fourth example.
- the imaging lens IL (4) according to the fourth embodiment includes a first lens group G1 having a positive refractive power and a second lens group having a negative refractive power, which are arranged in order from the object side along the optical axis. G2, and a third lens group G3 having positive refractive power.
- the first lens group G1 includes a biconvex positive lens L11, a positive meniscus lens L12 with a convex surface facing the object side, and a positive meniscus lens L12 with a concave surface facing the object side, which are arranged in order from the object side along the optical axis. It is composed of a cemented lens in which a lens L13 and a biconcave negative lens L14 are cemented.
- the positive meniscus lens L13 which is a cemented lens in the first lens group G1, corresponds to a positive lens that satisfies the above-mentioned conditional expression (1).
- the second lens group G2 is composed of a negative meniscus lens L21 with a convex surface facing the object side.
- the negative meniscus lens L21 in the second lens group G2 corresponds to a negative lens that satisfies the above-mentioned conditional expression (5).
- the third lens group G3 is composed of a positive meniscus lens L31 with a convex surface facing the object side.
- An image plane I is arranged on the image side of the third lens group G3.
- Table 4 below lists the values of the specifications of the imaging lens according to the fourth example. Note that the first surface is the entrance pupil plane P of the imaging lens.
- FIG. 14 is a diagram showing various aberrations (spherical aberration, field curvature, and distortion aberration) of the imaging lens according to the fourth example.
- FIG. 15 is a diagram showing the lateral chromatic aberration (lateral chromatic aberration) of the imaging lens according to the fourth example.
- FIG. 16 is a diagram showing coma aberration (meridional coma aberration and sagittal coma aberration) of the imaging lens according to the fourth example. From each aberration diagram, it can be seen that the imaging lens according to the fourth example has excellent optical performance, with various aberrations including chromatic aberration being well corrected over a wide wavelength range.
- FIG. 17 is a cross-sectional view showing the configuration of an imaging lens according to the fifth example.
- the imaging lens IL (5) according to the fifth embodiment includes a first lens group G1 having a positive refractive power and a second lens group having a negative refractive power, which are arranged in order from the object side along the optical axis. G2, and a third lens group G3 having positive refractive power.
- the first lens group G1 includes a biconvex positive lens L11, a positive meniscus lens L12 with a convex surface facing the object side, and a positive meniscus lens L12 with a concave surface facing the object side, which are arranged in order from the object side along the optical axis. It is composed of a cemented lens in which a lens L13 and a biconcave negative lens L14 are cemented.
- the positive meniscus lens L13 which is a cemented lens in the first lens group G1, corresponds to a positive lens that satisfies the above-mentioned conditional expression (1).
- the second lens group G2 is composed of a negative meniscus lens L21 with a convex surface facing the object side.
- the negative meniscus lens L21 in the second lens group G2 corresponds to a negative lens that satisfies the above-mentioned conditional expression (5).
- the third lens group G3 is composed of a biconvex positive lens L31.
- An image plane I is arranged on the image side of the third lens group G3.
- Table 5 below lists the values of the specifications of the imaging lens according to the fifth example. Note that the first surface is the entrance pupil plane P of the imaging lens.
- FIG. 18 is a diagram showing various aberrations (spherical aberration, field curvature, and distortion aberration) of the imaging lens according to the fifth example.
- FIG. 19 is a diagram showing the lateral chromatic aberration (lateral chromatic aberration) of the imaging lens according to the fifth example.
- FIG. 20 is a diagram showing coma aberration (meridional coma aberration and sagittal coma aberration) of the imaging lens according to the fifth example. From each aberration diagram, it can be seen that the imaging lens according to the fifth example has excellent optical performance, with various aberrations including chromatic aberration being well corrected over a wide wavelength range.
- Conditional expression (1) -0.002 ⁇ ( ⁇ dP-35)+0.602- ⁇ gFP ⁇ 0
- Conditional expression (2) 23 ⁇ dP ⁇ 65
- Conditional expression (3) 1.55 ⁇ ndP ⁇ 1.79
- Conditional expression (4) 0.4 ⁇ fP/f ⁇ 1.2
- Conditional expression (5) -0.0033 ⁇ ( ⁇ dN-35)+0.593- ⁇ gFN ⁇ 0
- Conditional expression (6) 20 ⁇ dN ⁇ 37
- Conditional expression (8) -1.1 ⁇ fN/f ⁇ -0.2 Conditional expression (9) 0.2 ⁇ Bf/TL ⁇ 0.6
- Conditional expression (10) 0.45 ⁇ f1/f3 ⁇ 2.4
- Conditional expression (11) -2.5 ⁇ f1/f2 ⁇ -0.6
- Conditional expression (12) 0.3 ⁇ DA/TL ⁇ 0.6
- Conditional expression (13) 0.1 ⁇ FDN/f ⁇ 0.18
- each of the above examples shows a specific example of the present embodiment, and the present embodiment is not limited thereto.
- the second lens group G2 is composed of one single lens having negative refractive power, but is not limited to this, and is composed of one cemented lens having negative refractive power. may be done.
- the third lens group G3 is composed of one single lens having positive refractive power, but is not limited to this, and may be composed of one cemented lens having positive refractive power.
- one positive lens (L13) in the imaging lens IL corresponds to a positive lens that satisfies the above-mentioned conditional expression (1), etc., but this is not limited to this.
- a plurality of positive lenses in the lens IL may correspond to positive lenses satisfying the above-mentioned conditional expression (1) and the like.
- G1 1st lens group G2 2nd lens group G3 3rd lens group I Image plane P Entrance pupil plane
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Abstract
Description
-0.002×(νdP-35)+0.602-θgFP<0
23<νdP<65
但し、νdP:前記正レンズのアッベ数
θgFP:前記正レンズの部分分散比であり、前記正レンズのg線に対する屈折率をngPとし、前記正レンズのF線に対する屈折率をnFPとし、前記正レンズのC線に対する屈折率をnCPとしたとき、次式で定義される
θgFP=(ngP-nFP)/(nFP-nCP)
-0.0033×(νdN-35)+0.593-θgFN<0
20<νdN<37
但し、νdN:前記負レンズのアッベ数
θgFN:前記負レンズの部分分散比であり、前記負レンズのg線に対する屈折率をngNとし、前記負レンズのF線に対する屈折率をnFNとし、前記負レンズのC線に対する屈折率をnCNとしたとき、次式で定義される
θgFN=(ngN-nFN)/(nFN-nCN)
-0.002×(νdP-35)+0.602-θgFP<0 ・・・(1)
23<νdP<65 ・・・(2)
但し、νdP:正レンズのアッベ数
θgFP:正レンズの部分分散比であり、正レンズのg線に対する屈折率をngPとし、正レンズのF線に対する屈折率をnFPとし、正レンズのC線に対する屈折率をnCPとしたとき、次式で定義される
θgFP=(ngP-nFP)/(nFP-nCP)
1.55<ndP<1.79 ・・・(3)
但し、ndP:正レンズのd線に対する屈折率
0.4<fP/f<1.2 ・・・(4)
但し、fP:正レンズの焦点距離
f:結像レンズILの焦点距離
-0.0033×(νdN-35)+0.593-θgFN<0 ・・・(5)
20<νdN<37 ・・・(6)
但し、νdN:負レンズのアッベ数
θgFN:負レンズの部分分散比であり、負レンズのg線に対する屈折率をngNとし、負レンズのF線に対する屈折率をnFNとし、負レンズのC線に対する屈折率をnCNとしたとき、次式で定義される
θgFN=(ngN-nFN)/(nFN-nCN)
ndN<1.78 ・・・(7)
但し、ndN:負レンズのd線に対する屈折率
-1.1<fN/f<-0.2 ・・・(8)
但し、fN:負レンズの焦点距離
f:結像レンズILの焦点距離
0.2<Bf/TL<0.6 ・・・(9)
但し、Bf:結像レンズILのバックフォーカス
TL:結像レンズILの全長
0.45<f1/f3<2.4 ・・・(10)
但し、f1:第1レンズ群G1の焦点距離
f3:第3レンズ群G3の焦点距離
-2.5<f1/f2<-0.6 ・・・(11)
但し、f1:第1レンズ群G1の焦点距離
f2:第2レンズ群G2の焦点距離
0.3<DA/TL<0.6 ・・・(12)
但し、DA:対物レンズの最も像側のレンズ面から結像レンズILの最も物体側のレンズ面まで光軸上の距離
TL:結像レンズILの全長
0.1<FDN/f<0.18 ・・・(13)
但し、FDN:顕微鏡装置の視野数
f:結像レンズILの焦点距離
第1実施例について、図1~図4および表1を用いて説明する。図2は、第1実施例に係る結像レンズの構成を示す断面図である。第1実施例に係る結像レンズIL(1)は、光軸に沿って物体側から順に並んだ、正の屈折力を有する第1レンズ群G1と、負の屈折力を有する第2レンズ群G2と、正の屈折力を有する第3レンズ群G3とから構成される。なお、結像レンズIL(1)の入射瞳面Pは、無限遠補正型の対物レンズ24の射出瞳面に対応する。像面Iは、上述の結像面13に相当する。このことは以下の全ての実施例でも同様である。
[全体諸元]
f=202.00 FNO=6.73
NA=0.07 Bf=88.65
TL=350.00 DA=160.00
FDN=25.00
[レンズ諸元]
面番号 R D nd νd θgF
1 ∞ 160.00
2 86.109 6.00 1.45600 91.37
3 -526.020 0.20
4 56.104 4.67 1.49782 82.57
5 100.000 6.00 1.66382 27.35 0.6319
6 -200.000 8.10 1.73800 32.26
7 105.381 9.30
8 217.561 19.37 1.75575 24.71 0.6290
9 40.184 42.71
10 103.799 5.00 1.85025 30.05
11 317.656 Bf
[レンズ群データ]
群 始面 焦点距離
G1 2 95.68
G2 8 -68.43
G3 10 179.41
第2実施例について、図5~図8および表2を用いて説明する。図5は、第2実施例に係る結像レンズの構成を示す断面図である。第2実施例に係る結像レンズIL(2)は、光軸に沿って物体側から順に並んだ、正の屈折力を有する第1レンズ群G1と、負の屈折力を有する第2レンズ群G2と、正の屈折力を有する第3レンズ群G3とから構成される。
[全体諸元]
f=201.00 FNO=10.05
NA=0.05 Bf=109.11
TL=350.00 DA=150.00
FDN=32.00
[レンズ諸元]
面番号 R D nd νd θgF
1 ∞ 150.00
2 96.572 12.65 1.45600 91.37
3 -1109.978 26.76
4 45.609 6.61 1.45600 91.37
5 579.024 0.20
6 40.424 4.01 1.61750 30.83 0.6231
7 61.797 3.00 1.73800 32.33
8 30.170 6.82
9 -77.424 9.49 1.59270 35.27 0.5935
10 73.813 17.73
11 2014.458 3.61 1.85025 30.05
12 -114.386 Bf
[レンズ群データ]
群 始面 焦点距離
G1 2 103.23
G2 9 -62.30
G3 11 127.40
第3実施例について、図9~図12並びに表3を用いて説明する。図9は、第3実施例に係る結像レンズの構成を示す断面図である。第3実施例に係る結像レンズIL(3)は、光軸に沿って物体側から順に並んだ、正の屈折力を有する第1レンズ群G1と、負の屈折力を有する第2レンズ群G2と、正の屈折力を有する第3レンズ群G3とから構成される。
[全体諸元]
f=200.25 FNO=8.01
NA=0.06 Bf=100.00
TL=321.62 DA=130.00
FDN=32.00
[レンズ諸元]
面番号 R D nd νd θgF
1 ∞ 130.00
2 61.153 7.64 1.43425 94.77
3 -5880.256 0.30
4 76.472 5.20 1.56908 71.34
5 198.298 0.30
6 111.442 7.19 1.66382 27.35 0.6319
7 -112.886 3.00 1.73800 32.33
8 115.027 20.21
9 -382.558 5.00 1.75575 24.71 0.6290
10 44.607 37.79
11 141.268 5.00 1.85025 30.05
12 -449.497 Bf
[レンズ群データ]
群 始面 焦点距離
G1 2 87.81
G2 9 -52.60
G3 11 126.91
第4実施例について、図13~図16並びに表4を用いて説明する。図13は、第4実施例に係る結像レンズの構成を示す断面図である。第4実施例に係る結像レンズIL(4)は、光軸に沿って物体側から順に並んだ、正の屈折力を有する第1レンズ群G1と、負の屈折力を有する第2レンズ群G2と、正の屈折力を有する第3レンズ群G3とから構成される。
[全体諸元]
f=200.50 FNO=6.68
NA=0.07 Bf=80.00
TL=348.66 DA=160.00
FDN=25.00
[レンズ諸元]
面番号 R D nd νd θgF
1 ∞ 160.00
2 78.259 10.55 1.45600 91.37
3 -286.156 0.30
4 65.866 6.60 1.45600 91.37
5 286.969 6.00
6 -573.131 4.65 1.66382 27.35 0.6319
7 -114.403 10.82 1.67300 38.26
8 75.339 37.67
9 63.694 4.64 1.61750 30.83 0.6231
10 41.142 22.43
11 76.078 5.00 1.85025 30.05
12 130.046 Bf
[レンズ群データ]
群 始面 焦点距離
G1 2 192.28
G2 9 -204.21
G3 11 206.81
第5実施例について、図17~図20並びに表5を用いて説明する。図17は、第5実施例に係る結像レンズの構成を示す断面図である。第5実施例に係る結像レンズIL(5)は、光軸に沿って物体側から順に並んだ、正の屈折力を有する第1レンズ群G1と、負の屈折力を有する第2レンズ群G2と、正の屈折力を有する第3レンズ群G3とから構成される。
[全体諸元]
f=200.25 FNO=8.01
NA=0.06 Bf=149.89
TL=327.69 DA=140.00
FDN=25.00
[レンズ諸元]
面番号 R D nd νd θgF
1 ∞ 140.00
2 50.458 7.00 1.45600 91.37
3 -1015.705 0.30
4 50.531 5.00 1.45600 91.37
5 242.282 3.00
6 -418.199 4.50 1.75575 24.71 0.6290
7 -78.557 3.00 1.67300 38.26
8 48.197 4.00
9 2824.698 4.00 1.61750 30.83 0.6231
10 56.230 3.00
11 117.967 4.00 1.85025 30.05
12 -236.827 Bf
[レンズ群データ]
群 始面 焦点距離
G1 2 204.84
G2 9 -92.96
G3 11 93.10
条件式(1) -0.002×(νdP-35)+0.602-θgFP<0
条件式(2) 23<νdP<65
条件式(3) 1.55<ndP<1.79
条件式(4) 0.4<fP/f<1.2
条件式(5) -0.0033×(νdN-35)+0.593-θgFN<0
条件式(6) 20<νdN<37
条件式(7) ndN<1.78
条件式(8) -1.1<fN/f<-0.2
条件式(9) 0.2<Bf/TL<0.6
条件式(10) 0.45<f1/f3<2.4
条件式(11) -2.5<f1/f2<-0.6
条件式(12) 0.3<DA/TL<0.6
条件式(13) 0.1<FDN/f<0.18
条件式 第1実施例 第2実施例 第3実施例
(1) -0.0146 -0.0128 -0.0146
(2) 27.35 30.83 27.35
(3) 1.6638 1.6175 1.6638
(4) 0.50 0.88 0.43
(5) -0.0020 -0.0014 -0.0020
(6) 24.71 35.27 24.71
(7) 1.7558 1.5927 1.7558
(8) -0.34 -0.31 -0.26
(9) 0.25 0.31 0.31
(10) 0.53 0.81 0.69
(11) -1.40 -1.66 -1.67
(12) 0.46 0.43 0.40
(13) 0.12 0.16 0.16
[条件式対応値](第4~第5実施例)
条件式 第4実施例 第5実施例
(1) -0.0146 -0.0064
(2) 27.35 24.71
(3) 1.6638 1.7558
(4) 1.07 0.64
(5) -0.0163 -0.0163
(6) 30.83 30.83
(7) 1.6175 1.6175
(8) -1.02 -0.46
(9) 0.23 0.46
(10) 0.93 2.20
(11) -0.94 -2.20
(12) 0.46 0.43
(13) 0.12 0.12
G3 第3レンズ群
I 像面 P 入射瞳面
Claims (13)
- 対物レンズからの光を結像させる顕微鏡用の結像レンズであって、
負レンズと、以下の条件式を満足する正レンズとを有する結像レンズ。
-0.002×(νdP-35)+0.602-θgFP<0
23<νdP<65
但し、νdP:前記正レンズのアッベ数
θgFP:前記正レンズの部分分散比であり、前記正レンズのg線に対する屈折率をngPとし、前記正レンズのF線に対する屈折率をnFPとし、前記正レンズのC線に対する屈折率をnCPとしたとき、次式で定義される
θgFP=(ngP-nFP)/(nFP-nCP) - 対物レンズからの光を結像させる顕微鏡用の結像レンズであって、
正レンズと、以下の条件式を満足する負レンズとを有する結像レンズ。
-0.0033×(νdN-35)+0.593-θgFN<0
20<νdN<37
但し、νdN:前記負レンズのアッベ数
θgFN:前記負レンズの部分分散比であり、前記負レンズのg線に対する屈折率をngNとし、前記負レンズのF線に対する屈折率をnFNとし、前記負レンズのC線に対する屈折率をnCNとしたとき、次式で定義される
θgFN=(ngN-nFN)/(nFN-nCN) - 前記正レンズが以下の条件式を満足する請求項1に記載の結像レンズ。
1.55<ndP<1.79
但し、ndP:前記正レンズのd線に対する屈折率 - 前記負レンズが以下の条件式を満足する請求項2に記載の結像レンズ。
ndN<1.78
但し、ndN:前記負レンズのd線に対する屈折率 - 前記正レンズが以下の条件式を満足する請求項1または3に記載の結像レンズ。
0.4<fP/f<1.2
但し、fP:前記正レンズの焦点距離
f:前記結像レンズの焦点距離 - 前記負レンズが以下の条件式を満足する請求項2または4に記載の結像レンズ。
-1.1<fN/f<-0.2
但し、fN:前記負レンズの焦点距離
f:前記結像レンズの焦点距離 - 以下の条件式を満足する請求項1~6のいずれか一項に記載の結像レンズ。
0.2<Bf/TL<0.6
但し、Bf:前記結像レンズのバックフォーカス
TL:前記結像レンズの全長 - 正の屈折力を有する第1レンズ群と、負の屈折力を有する第2レンズ群と、正の屈折力を有する第3レンズ群とからなり、
前記第2レンズ群は、負の屈折力を有する1つのレンズ成分からなり、
前記第3レンズ群は、正の屈折力を有する1つのレンズ成分からなる請求項1~7のいずれか一項に記載の結像レンズ。 - 以下の条件式を満足する請求項8に記載の結像レンズ。
0.45<f1/f3<2.4
但し、f1:前記第1レンズ群の焦点距離
f3:前記第3レンズ群の焦点距離 - 以下の条件式を満足する請求項8または9に記載の結像レンズ。
-2.5<f1/f2<-0.6
但し、f1:前記第1レンズ群の焦点距離
f2:前記第2レンズ群の焦点距離 - 物体からの光を受けて平行光にする対物レンズと、請求項1~10のいずれか一項に記載の結像レンズとを有する顕微鏡装置。
- 以下の条件式を満足する請求項11に記載の顕微鏡装置。
0.3<DA/TL<0.6
但し、DA:前記対物レンズの最も像側のレンズ面から前記結像レンズの最も物体側のレンズ面まで光軸上の距離
TL:前記結像レンズの全長 - 以下の条件式を満足する請求項11または12に記載の顕微鏡装置。
0.1<FDN/f<0.18
但し、FDN:前記顕微鏡装置の視野数
f:前記結像レンズの焦点距離
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012234056A (ja) * | 2011-05-02 | 2012-11-29 | Olympus Corp | 結像レンズ、撮像光学系、及び、顕微鏡 |
| JP6397717B2 (ja) * | 2014-10-08 | 2018-09-26 | オリンパス株式会社 | 顕微鏡結像レンズ、顕微鏡装置、及び、撮像光学系 |
| JP2019207376A (ja) * | 2018-05-30 | 2019-12-05 | キヤノン株式会社 | 光学系およびそれを有する撮像装置 |
| JP2021043385A (ja) * | 2019-09-13 | 2021-03-18 | キヤノン株式会社 | 対物レンズおよびそれを有する撮像装置 |
| JP2021117447A (ja) * | 2020-01-29 | 2021-08-10 | 株式会社リコー | 撮像レンズおよびカメラ装置および移動体 |
| WO2021215312A1 (ja) * | 2020-04-20 | 2021-10-28 | 株式会社ニコン | 顕微鏡光学系、顕微鏡装置、および結像レンズ |
| JP2021173846A (ja) * | 2020-04-23 | 2021-11-01 | キヤノン株式会社 | 光学系および撮像装置 |
| JP2021184030A (ja) * | 2020-05-21 | 2021-12-02 | キヤノン株式会社 | 単焦点レンズおよび撮像装置 |
| JP2022016822A (ja) * | 2020-07-13 | 2022-01-25 | キヤノン株式会社 | 光学系及びそれを有する撮像装置 |
-
2023
- 2023-04-10 US US18/859,266 patent/US20250199284A1/en active Pending
- 2023-04-10 WO PCT/JP2023/014513 patent/WO2023210318A1/ja not_active Ceased
- 2023-04-10 JP JP2024517956A patent/JPWO2023210318A1/ja active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012234056A (ja) * | 2011-05-02 | 2012-11-29 | Olympus Corp | 結像レンズ、撮像光学系、及び、顕微鏡 |
| JP6397717B2 (ja) * | 2014-10-08 | 2018-09-26 | オリンパス株式会社 | 顕微鏡結像レンズ、顕微鏡装置、及び、撮像光学系 |
| JP2019207376A (ja) * | 2018-05-30 | 2019-12-05 | キヤノン株式会社 | 光学系およびそれを有する撮像装置 |
| JP2021043385A (ja) * | 2019-09-13 | 2021-03-18 | キヤノン株式会社 | 対物レンズおよびそれを有する撮像装置 |
| JP2021117447A (ja) * | 2020-01-29 | 2021-08-10 | 株式会社リコー | 撮像レンズおよびカメラ装置および移動体 |
| WO2021215312A1 (ja) * | 2020-04-20 | 2021-10-28 | 株式会社ニコン | 顕微鏡光学系、顕微鏡装置、および結像レンズ |
| JP2021173846A (ja) * | 2020-04-23 | 2021-11-01 | キヤノン株式会社 | 光学系および撮像装置 |
| JP2021184030A (ja) * | 2020-05-21 | 2021-12-02 | キヤノン株式会社 | 単焦点レンズおよび撮像装置 |
| JP2022016822A (ja) * | 2020-07-13 | 2022-01-25 | キヤノン株式会社 | 光学系及びそれを有する撮像装置 |
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