JP2004354515A - Filter, filter device and optical device using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a filter restraining the variance of an image forming position occurring because it is switched, and a filter device and an optical device using the same. <P>SOLUTION: The filter has a mark 3 showing the direction (arrow) of the deviation of the emitting optical axis of luminous flux transmitted through filters 5a, 5b and 5c with reference to the incident optical axis of the luminous flux made incident on the filters 5a, 5b and 5c, or the direction and the angle of the deviation of the emitting optical axis thereof. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a filter used in an optical device, and more particularly, to a filter device capable of switching a plurality of filters.
[0002]
[Prior art]
As a filter, a filter having a predetermined spectral characteristic by forming a dielectric film or the like on a parallel flat substrate made of glass or the like which has been cut out into a circular or rectangular shape and a substrate having a spectral characteristic is used. ing. Heretofore, when a filter device that allows the filter to be replaced using such a filter is configured in the optical path, the deflection angle of each filter has varied.
[0003]
[Problems to be solved by the invention]
However, filters using these parallel plane glasses are originally parallel planes and are not intended to impart a deflection angle to transmitted light, but due to the accuracy error in the parallelism of both surfaces of the parallel plane that occurs during manufacturing. There is a slight slope, and light passing through the filter is deflected. For this reason, when the light transmitted through the filter is imaged by the imaging lens, a shift occurs with respect to the imaging position where the light not passing through the filter is imaged by the imaging lens. Further, when a plurality of filters are exchanged and used, there is a problem that an image forming position varies before and after the filter is switched.
[0004]
SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a filter, a filter device, and an optical device using the same, which suppress variation in an image forming position due to filter switching.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a filter, wherein a plurality of filter units are formed on a single glass substrate so as to be arranged substantially linearly.
[0006]
In addition, the present invention relates to a direction of a shift of an output optical axis of the light beam transmitted through the filter, or a direction of a shift of the output optical axis and a direction of the output optical axis with respect to an incident optical axis of the light beam incident on the filter. Provided is a filter having a mark indicating a shift angle.
[0007]
Further, the present invention is a filter formed so that two glass surfaces face each other substantially in parallel, and the light flux of each of the two glasses is set with respect to the incident optical axis of the light flux incident on the filter. A filter is provided, wherein the direction of shift of the output optical axis is opposite to the direction of the incident optical axis, and the angles of shift of the respective output optical axes are substantially equal.
[0008]
Further, the present invention is a filter device that has a plurality of filters having different spectral characteristics, and is used by being selectively disposed at a predetermined position in an optical path of an optical system using the plurality of filters. The filter is configured such that a shift angle of the output optical axis with respect to the incident optical axis is substantially equal, and a direction of the shift of the output optical axis with respect to the incident optical axis is substantially the same direction when the filter is disposed at the predetermined position. Provided is a filter device characterized in that:
[0009]
Further, the present invention has a plurality of filters according to claim 2 having different spectral characteristics, and the plurality of filters are configured to be exchangeable at predetermined positions in an optical path of an optical system using the filters. A filter device is provided.
[0010]
In the filter device according to the present invention, it is preferable that the plurality of filters are arranged on a rotating turret.
[0011]
Further, in the filter device according to the present invention, it is preferable that the plurality of filters are arranged on a substantially rectangular slider.
[0012]
The present invention also provides an optical device comprising the above-mentioned filter device.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described with reference to the drawings.
[0014]
FIG. 1 is a schematic configuration diagram of a filter according to the first embodiment of the present invention. FIG. 2 is a schematic configuration diagram of a filter according to a second embodiment of the present invention. FIG. 3 is a schematic configuration diagram of a filter device according to a third embodiment of the present invention. FIG. 4 is a schematic configuration diagram of a filter device according to a fourth embodiment of the present invention. FIG. 5 is a schematic configuration diagram of a filter unit and a filter device according to a fifth embodiment of the present invention. FIG. 6 is a schematic configuration diagram of a laser scanning microscope using the filter and the filter device according to the present invention. FIG. 7 shows a partially enlarged view of the vicinity of the filter device of the illumination optical system of FIG. FIG. 8 is a partially enlarged view of the vicinity of the fluorescent filter unit in FIG. FIG. 9 is a schematic configuration diagram of a fluorescence microscope device equipped with the filter device according to the present invention. FIG. 10 is a partially enlarged view of the filter set and the fluorescence filter device of the fluorescence microscope device shown in FIG.
[0015]
(1st Embodiment)
FIG. 1 is a schematic configuration diagram of a filter according to the first embodiment of the present invention.
[0016]
In FIG. 1, a glass substrate 1 whose both surfaces are polished deviates in parallelism (becomes a wedge type) at the time of polishing, so that light incident on this glass substrate undergoes a refraction action and an outgoing optical axis is changed. A shift occurs with respect to the incident optical axis. The direction of the shift of the parallelism of the glass substrate corresponds to the direction of the shift of the optical axis of the light beam incident on the filter, and the angle of approximately の of the shift angle of the parallelism corresponds to the shift angle of the optical axis. Therefore, the direction of the optical axis shift and the angle of the shift of the light beam incident on the filter, and the direction of the shift of the parallelism of the glass substrate and the angle of the shift have the same meaning, respectively. The direction of axis displacement and the angle of displacement (magnitude of displacement) are used.
[0017]
On a plane perpendicular to the incident optical axis, the direction of displacement of the output optical axis with respect to the incident optical axis is indicated by an arrow in FIG. In the same glass substrate 1, the wedge shape after polishing is substantially constant, the direction of displacement of the output optical axis is substantially the same regardless of the location of the glass substrate 1, and the magnitude of displacement (expressed in angle) is also substantially the same. It is equal (generally, in the optics, the direction of the shift and the angle of the shift are referred to as a deflection angle, for example).
[0018]
In the first embodiment, the chamfer 3 is applied to the glass substrate 1 in a direction perpendicular to the direction of the shift (arrow) as a mark indicating the direction of the shift of the output optical axis or the direction of the shift and the size of the shift. It is formed in a place outside the effective area. By forming the chamfer 3 in this manner, it is possible to determine the direction of the displacement or the direction of the displacement and the magnitude of the displacement based on the appearance of the filter.
[0019]
Note that the position of the chamfer 3 is not limited to a direction perpendicular to the direction of the displacement, but may be a position having a predetermined angle. In addition, the magnitude of the deviation may be classified, for example, into large, medium, and small, and the magnitude of the deviation may be determined by the shape (eg, angle, width, shape) of the chamfer 3. The mark indicating the direction of the shift or the direction of the shift and the size of the shift may be any mark other than the chamfer 3, such as a marking line mark or a dot mark. The numerical value of the angle may be directly displayed on the periphery of the filter or the chamfered portion by marking or the like.
[0020]
The glass substrate 1 on which the chamfer 3 is formed is cut into a filter shape (for example, a circle), and a dielectric film or the like is formed by vapor deposition, sputtering, or the like so as to have predetermined spectral characteristics. 5c is formed. It is to be noted that a film may be formed so as to have a predetermined spectral characteristic before cutting the glass substrate 1 and then cut into a filter shape. Although the filters 5a, 5b and 5c have been described as having different spectral characteristics for the sake of explanation, the filters 5a, 5b and 5c may have the same spectral characteristics.
[0021]
Thus, the filters 5a, 5b, and 5c having the marks 3 indicating the direction of the shift of the output optical axis or the direction of the shift and the size of the shift are formed.
[0022]
In the filter according to the first embodiment, the direction of the shift of the output optical axis of the filter 5 (5a, 5b, 5c is represented as 5) or the direction of the shift and the size of the shift are determined by the position and the shape of the chamfer 3. It can be determined. As a result, when selecting a filter, it is possible to finish the direction of the shift of the output optical axis, and if there is a mark indicating the direction of the shift and the size of the shift, a filter having the same size of the shift is used. You can choose.
[0023]
The glass substrate 1 is not particularly limited to a rectangular shape as long as the same effects as described above can be obtained. Further, a single glass substrate 1 may be formed by laminating and bonding a plurality of colored glass or film-formed glass or the like.
[0024]
(2nd Embodiment)
FIG. 2 is a schematic configuration diagram of a filter according to a second embodiment of the present invention.
[0025]
In FIG. 2, at least one of the glass substrates 10a and 10b having substantially the same size (deflection angle) as the direction of deviation of the output optical axis has a spectral characteristic, and the two glass substrates 10a and 10b have the optical axis a. The surfaces are arranged so as to face each other substantially in parallel to a plane substantially perpendicular to. The directions of displacement of the emission optical axes of the two glass substrates 10a and 10b are indicated by solid and dashed arrows in the figure, and the directions of displacement are opposite to each other with respect to the optical axis a, and the magnitude of the displacement is The filter 15 is configured to be substantially equal, and the deflection angle of the two glasses 10a and 10b is canceled. As a result, in the filter 15, the deflection angle becomes substantially zero. Thus, the filter 15 is configured.
[0026]
In the filter 15 of the second embodiment, the direction of deviation of the emission optical axis of the glass substrate 10a whose direction is upward (solid arrow) and the direction of deviation of the downward (dashed arrow) glass substrate 10b are substantially equal to the direction of deviation. Since the deflection angles are substantially equal, the deflection angle can be canceled by both, and the filter 15 does not have a shift in the imaging position when inserted into the optical path a of the optical system.
[0027]
In addition, by using the mark 3 indicating the deflection angle formed on the filter, the filter is formed such that the deflection optical axes are shifted in a certain direction by aligning the deflection angles of a plurality of glass substrates (including the filter). It is also possible. Further, the filter of the present embodiment is used in a fifth embodiment to be described later, and a plurality of filter portions are formed on a single rectangular glass substrate, and the same shape of the glass substrate and the deviation of the optical axis are used. By disposing the glass substrate having the opposite direction facing the glass substrate, a filter in which the deflection angle is suppressed to almost zero can be manufactured by a simple process.
[0028]
(Third embodiment)
In the third embodiment, a filter device in which a plurality of filters are selectively arranged at predetermined positions in an optical path of an optical system is shown.
[0029]
In FIG. 3, filters 25a, 25b, 25c, and 25d in which the magnitudes of the deviation of the output optical axis with respect to the incident optical axis are substantially equal are such that the filters 25a to 25d are alternatively disposed at predetermined positions of the optical axis 22. In this case, the turrets 24 are disposed on the turret 24 having the rotation axis center 23 so that the directions of the displacement with respect to the optical axis 22 of the optical system (the direction perpendicular to the paper surface) are substantially the same (for example, the X direction in the drawing). I have. The filter device 20 is configured as described above.
[0030]
In FIG. 3, the filters 25 a to 25 d are arranged such that the directions of the shift of the emission optical axes are radially outward from the rotation axis center 23 of the turret 24.
[0031]
In the filter device 20 according to the third embodiment, by rotating the rotary turret 24, filters 25a to 25d having various spectral characteristics can be alternatively arranged at predetermined positions on the optical axis 22 of the optical system. When the filters are arranged at predetermined positions, the deviations of the output optical axes of the filters 25a to 25d are substantially equal, and the directions of the deviations are the same. Therefore, it is possible to prevent the imaging position from being varied for each filter. It becomes possible.
[0032]
Note that the direction of the shift of the output optical axis is not limited to the above. If the filters are arranged on the rotary turret 24 so that the direction of the shift is the same direction when the filters are arranged on the optical axis 22 of the optical system. A similar effect is achieved. In addition, the number of filters mounted on the rotating turret 24 is not limited to four, and can be appropriately changed as needed. When a filter is not required, if only glass substrates having the same displacement direction and the same magnitude of displacement are arranged, it is possible to prevent variations in the imaging position.
[0033]
Further, the filter 15 shown in the second embodiment may be used as a filter mounted on the rotating turret 24. In this case, since the deflection angle of the filter 15 is canceled in the filter 15, even if the filter is replaced, the imaging position does not vary.
[0034]
(Fourth embodiment)
In the fourth embodiment, another embodiment of a filter device in which a plurality of filters are selectively arranged at predetermined positions in an optical path of an optical system is shown.
[0035]
In FIG. 4, the filters 35a, 35b, and 35c having substantially the same magnitude of deviation of the output optical axis with respect to the incident optical axis have different deviation directions with respect to the optical axis 32 (perpendicular to the paper) of the optical system. When the filters 35a to 35c are arranged at the position of the optical axis 32, they are arranged on the slider 34 so as to be in the same direction (upward in the figure), and the filter device 30 is configured.
[0036]
In the filter device 30 according to the fourth embodiment, the filters 35a to 35c having various spectral characteristics can be selectively inserted into the optical path by inserting and removing the slider 34 substantially perpendicularly to the optical axis 32 of the optical system. Since the magnitudes of the shifts of the emission optical axes of the filters 35a to 35c are substantially equal and the directions of the shifts are the same, it is possible to prevent variations in the imaging position when the filters 35a to 35c are arranged. It becomes.
[0037]
The direction of the shift of the emission optical axis is not limited to the above, and the same effect can be obtained if the filters are arranged so that the direction of the shift becomes the same direction when the filter is inserted into the optical axis 32. . Further, the number of filters mounted on the slider 34 can be changed as needed. Further, when a filter is unnecessary, if a glass substrate having the same displacement direction and the same magnitude of displacement is inserted, it is possible to prevent variations in the imaging position. Further, as the filter mounted on the slider 34, the filter 15 described in the second embodiment may be used.
[0038]
(Fifth embodiment)
In the fifth embodiment, a filter device in which a filter formed by arranging a plurality of filter portions in a straight line on a single rectangular glass substrate is selectively disposed at a predetermined position in an optical path of an optical system. Is shown.
[0039]
In FIG. 5, a filter device 40 is formed using a filter 40 in which filter portions 45a, 45b, and 45c having different spectral characteristics are formed on the surface of a rectangular glass substrate 41 by film formation or the like. The rectangular glass substrate 41 has a role of a slider when being inserted into and removed from the optical device. By inserting the filter 40 substantially perpendicular to the optical axis 42 of the optical system, the filter portions 45a, 45b, and 45c are formed. It is configured to serve as an alternative replaceable filter device 40.
[0040]
In the filter device 40 according to the fifth embodiment, by inserting a rectangular glass substrate 41, which is a slider, substantially perpendicularly to the optical axis 42 of the optical device, filter portions 45a to 45c having various spectral characteristics are placed in the optical path. The direction and magnitude of the deviation of the outgoing optical axis from the incident optical axis of each of the filter sections 45a to 45c are substantially equal because the glass substrate 41 is the same. Even if ~ 45c) is inserted, the imaging position does not vary.
[0041]
Note that the number of filter portions formed on the glass substrate 41 can be changed as needed. In addition, when the filter section is unnecessary, if only the glass substrate 41 is used, it is possible to prevent a variation in the imaging position.
[0042]
(Sixth embodiment)
Next, an optical device equipped with the filter device according to the present invention will be described.
[0043]
FIG. 6 is a schematic configuration diagram of a laser microscope device equipped with the filter device according to the present invention.
[0044]
6, a laser beam 53a from a laser light source 51 is condensed by a lens 55a, is incident on an optical fiber connector 57a at one end of an optical fiber 59, and is transmitted by the optical fiber 59. The laser beam 53b emitted from the optical fiber connector 57b at the other end of the optical fiber 59 is collimated by the lens 55b and enters the neutral density filter device 60. The laser beam that has passed through the neutral density filter device 60 has its beam diameter expanded by a beam expander 61, and then enters a beam splitter 65 through a laser wavelength selection filter 63.
[0045]
The neutral density filter device 60 is for adjusting the amount of laser light, and is configured so that several types of neutral density filters 60a to 60c can be inserted into and removed from the optical axis of the illumination optical system. The beam expander 61 is for expanding the laser beam to a predetermined thickness, but may be omitted in some cases. The laser wavelength selection filter 63 is for selectively transmitting only a predetermined wavelength when the wavelength of the laser beam 53a emitted from the laser light source 51 is not a single wavelength.
[0046]
The laser light reflected by the beam splitter 65 passes through a relay lens 69 via a scanner unit 67 and is condensed at a predetermined position on a specimen 73 by an objective lens 71. The scanner unit 67 scans the incident laser beam two-dimensionally on the specimen 73 at the focal point.
[0047]
The radiation generated from the sample 73 by the irradiation is condensed by the objective lens 71, enters the scanner unit 67 via the relay lens 69, exits, passes through the beam splitter 65, and passes through the condensing lens 77 into the pinhole 79. Is collected at the position. Only the light transmitted through the position of the pinhole 79 is detected by the light receiver 81, the signal is processed by the image processing device 83, and displayed on a monitor (not shown).
[0048]
The image processing device 83 forms an image of the intensity of the amount of light received from the light receiver 81 in accordance with the scanning of the scanner unit 67.
[0049]
When the radiation generated from the specimen 73 is the fluorescence from the specimen, the fluorescence filter 75 for selectively transmitting only the fluorescence from the radiation from the specimen 73 in order to receive the fluorescence by the light receiver 21 is used. It is arranged between the splitter 65 and the light receiver 81. In this case, a laser scanning fluorescence microscope is used.
[0050]
Here, the filter device according to the embodiment of the present invention can be used for any or all of the neutral density filter 60, the laser wavelength selection filter 63, and the fluorescent filter 75. In FIG. 6, for simplicity of explanation, only the neutral density filter 60 is a filter device according to the embodiment of the present invention.
[0051]
6 and 7, a neutral density filter 60 is a filter device in which filters 60a, 60b, and 60c having a plurality of wavelength characteristics are selectively disposed substantially perpendicular to the optical axis of the illumination optical system. It is possible to arrange the filter devices shown in the third to fifth embodiments of the present invention, and which filter device is used is determined by the design of the optical device. By using the filter device according to the embodiment of the present invention for the neutral density filter 60, the image forming position of the illumination light on the sample 73 does not shift even if any of the filters 60a, 60b, and 60c is replaced. Since the light from 73 is condensed on the pinhole 9, an image of the same portion of the specimen 73 can be received by the light receiver 81 satisfactorily.
[0052]
The neutral density filter 60 may be provided between the laser light source 51 and the lens 55a. In this case, even if the filter is replaced, the laser beam 53a from the laser light source 51 can be focused on the effective area on the end face of the laser connector 57a by the lens 55a.
[0053]
FIG. 8 is a partially enlarged view when the filter device according to the embodiment of the present invention is used for a fluorescent filter 75. The fluorescent filter 75 has filters 75a, 75b, and 75c that transmit different fluorescent light, and is disposed so as to be exchangeable substantially perpendicular to the optical axis of the observation optical system in FIG. As the filter device, any of the filter devices according to the third to fifth embodiments of the present invention can be used, and which filter device is used is determined by design.
[0054]
By arranging the filter device according to the embodiment of the present invention, the deflection angle becomes constant irrespective of the filter, and the fluorescent light from the same part of the specimen 73 can be focused on the pinhole 79 by the focusing lens 77. It becomes. Further, in FIG. 6, the description has been given by taking the neutral density filter 60, the laser wavelength selection filter 63, and the fluorescent filter 75 as an example. However, the present invention is not limited to this, and the filter type and any part in the optical path may be used alone. , Or in combination. Even in this case, the degree of freedom is high by using the filter and the filter device according to the present embodiment in which the direction of the optical axis of the light beam incident on each filter or the direction and the amount of the deviation are known in advance. Observation can be realized.
[0055]
(Seventh embodiment)
FIG. 9 is a schematic configuration diagram of a fluorescence microscope device equipped with the filter device according to the present invention. FIG. 10 is a partially enlarged view of the filter set and the fluorescence filter device of the fluorescence microscope device shown in FIG.
[0056]
9 and 10, illumination light from a light source 91 is incident on a filter set 93 having a plurality of excitation filters and beam splitters via an illumination optical system 92. The light transmitted through the excitation filter 110a of the filter set 93 is reflected by the beam splitter 111a, enters the objective lens 94, and is collected on the sample 96 mounted on the stage 95.
[0057]
The fluorescent light from the sample 96 is collected by the objective lens 94, passes through the beam splitter 111a, passes through the fluorescent filter 112a of the fluorescent filter device 101 that transmits only fluorescent light of a predetermined wavelength, and is transmitted by the imaging lens 99. An image is formed on the imaging device 100 (for example, a CCD device) and observed on a monitor (not shown). Thus, a fluorescence microscope is configured.
[0058]
In the fluorescence microscope according to the seventh embodiment, the filter and the filter device according to the embodiment described above are used as the fluorescence filter device 101. A plurality of fluorescent filters 112a and 112b having different characteristics are arranged in the filter device 101, and are appropriately switched and used depending on the type of fluorescent light to be observed. By using the filter according to this embodiment, when the filter is arranged on the observation optical axis, the deflection angle of each filter with respect to the observation optical axis (the direction of the deviation of the exit optical axis with respect to the incident optical axis and the magnitude of the deviation) ) Can be made substantially the same, so that the image formation position on the image sensor 100 due to the replacement of the filter can be suppressed from varying. As a result, in the seventh embodiment, it is possible to configure a fluorescence microscope in which the image of each filter does not shift even when the filters are switched.
[0059]
【The invention's effect】
As described above, according to the present invention, it is possible to provide a filter, a filter device, and an optical device using the same, in which the variation in the imaging position due to the switching of the filter is suppressed.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of a filter according to a first embodiment of the present invention.
FIG. 2 is a schematic configuration diagram of a filter according to a second embodiment of the present invention.
FIG. 3 is a schematic configuration diagram of a filter device according to a third embodiment of the present invention.
FIG. 4 is a schematic configuration diagram of a filter device according to a fourth embodiment of the present invention.
FIG. 5 is a schematic configuration diagram of a filter unit and a filter device according to a fifth embodiment of the present invention.
FIG. 6 is a schematic configuration diagram of a laser scanning microscope using the filter and the filter device according to the present invention.
FIG. 7 is a partially enlarged view of the vicinity of a filter device of the illumination optical system in FIG. 6;
FIG. 8 is a partially enlarged view of the vicinity of the fluorescent filter unit in FIG. 6;
FIG. 9 is a schematic configuration diagram of a fluorescence microscope device equipped with a filter device according to the present invention.
10 is a partially enlarged view of a filter set and a fluorescence filter device of the fluorescence microscope device shown in FIG.
[Explanation of symbols]
1, 41 glass substrate 3 chamfer (mark)
5, 15, 25, 35, 45 Filter 10 Glass substrate 20, 30, 40 Filter device 22, 32, 42 Optical axis 23 Center of rotation axis 24 Rotating turret 34 Slider 51 Laser light source 53 Laser light 55 Lens 60 Light reduction filter device 60a ６０60c Filter 61 Expander 63 Wavelength selection filter 65 Beam splitter 67 Scanner unit 69 Relay lens 71 Objective lens 73 Specimen 75 Fluorescent filter device 77 Imaging lens 79 Pinhole 81 Photodetector 83 Image signal processing device 91 Light source 92 Illumination optical system 93 Filter set 94 Objective lens 95 Stage 96 Sample 99 Imaging lens 100 Imaging device 101 Filter devices 110a, 110b Excitation filters 111a, 111b Beam splitters 112a, 112b Fluorescence filters

Claims (8)

A filter comprising a plurality of filter portions arranged on a single glass substrate in a substantially linear manner. A mark indicating the direction of the shift of the output optical axis of the light beam transmitted through the filter or the direction of the shift of the output optical axis and the angle of the shift of the output optical axis with respect to the incident optical axis of the light beam incident on the filter. A filter comprising: A filter formed by opposing two glass surfaces substantially in parallel,
With respect to the incident optical axis of the light beam incident on the filter, the direction of the shift of the output optical axis of the light beam of each of the two glasses is opposite to the incident optical axis, and the direction of the respective output optical axes is A filter characterized in that displacement angles are substantially equal. Having a plurality of filters having different spectral characteristics,
A filter device that is selectively disposed and used at a predetermined position in an optical path of an optical system using the plurality of filters,
The plurality of filters have substantially the same angle of deviation of the outgoing optical axis with respect to the incident optical axis, and when disposed at the predetermined position, the direction of the shift of the outgoing optical axis with respect to the incident optical axis is substantially the same direction. A filter device characterized by being configured as described above. A plurality of filters according to claim 3 having different spectral characteristics,
The filter device, wherein the plurality of filters are configured to be exchangeable at predetermined positions in an optical path of an optical system using the filters. The filter device according to claim 4, wherein the plurality of filters are arranged on a rotating turret. The filter device according to claim 4, wherein the plurality of filters are arranged on a substantially rectangular slider. An optical device comprising the filter device according to claim 4.

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