# US 9,435,992 B2 · Microscope for widefield microscopy > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,435,992 B2 - Document ID: US9435992B2 - Status: Granted - Kind: B2 - Application number: 14/344,704 - Filed: 2012-09-04 - Published: 2014-11-27 - Granted: 2016-09-06 - Earliest claimed: 2011-09-30 - Assignees: Carl Zeiss Microscopy GmbH - Applicants: Ingo Kleppe; Daniel Schwedt - Inventors: Ingo Kleppe; Daniel Schwedt - Web page: https://patentgrep.com/patent/US9435992B2 ## CPC - G02B 21/361: {Optical details, e.g. image relay to the camera or image sensor (G02B21/364 takes precedence; illumination details G02B21/06 and subgroups)} - G02B 21/06: Means for illuminating specimens - G02B 21/16: adapted for ultraviolet illumination {; Fluorescence microscopes (G02B21/0076 takes precedence)} - G02B 21/362: {Mechanical details, e.g. mountings for the camera or image sensor, housings (G02B21/364 takes precedence)} - G02B 21/365: {Control or image processing arrangements for digital or video microscopes (G02B21/361, G02B21/362 take precedence)} - G02B 26/008: {in the form of devices for effecting sequential colour changes, e.g. colour wheels} - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS ## Abstract A microscope for widefield microscopy having a detection beam path and an illumination beam path. The microscope includes a filter wheel device, which is arranged in the detection beam path and/or illumination beam path and has a filter wheel, wherein the filter wheel is mounted to rotate about an axis, and wherein the filter wheel is divided into segments. Filters forming a first part-circle are arranged in a first part of the segments, such that said filters are consecutively introduced into the detection beam path or illumination beam path when the filter wheel is rotated. A camera records images at a predefined frequency. The filter wheel device includes a motor-driven shaft that rotates the filter wheel at a predefined rotation frequency. The microscope also comprises a control system for synchronizing the image-recording frequency and rotation frequency based on the filters arranged on the filter wheel. ## Claims ### Claim 1 A microscope for widefield microscopy with a detection beam path and an illumination beam path, comprising: a filter wheel device including at least one filter wheel mounted on a motor-driven shaft so as to be rotatable about an axis at a specified rotational frequency, the at least one filter wheel arranged in the detection beam path, or in the detection beam path and the illumination beam path, the at least one filter wheel being divided into a plurality of segments, a first plurality of filters forming a first divided circle being arranged in at least a first part of the segments, so that each filter in the first plurality of filters is successively introduced into the detection beam path or the illumination beam path when the filter wheel is rotated, and a second plurality of filters forming at least one more divided circle, arranged in at least the first part of the segments, so that the segments of the first part contain at least two filters arranged in succession in a radial direction, the filter wheel device further comprising means for deflecting light reflected by a first filter in a segment of the first part of segments onto a second filter in the same segment; at least one camera with a planar detector in the detection beam path, designed to record images at a specified frame rate; and a control system for synchronizing the frame rate and the rotational frequency depending on the filters arranged on the at least one filter wheel. ### Claim 2 (depends on 1) The microscope of claim 1, wherein, due to the synchronization of frame rate and rotational frequency, not more than one filter of the first divided circle per recorded frame is arranged in the detection beam path, or in the detection beam path and the illumination beam path. ### Claim 3 (depends on 1) The microscope of claim 1, wherein the at least one filter wheel is arranged in a pupil plane of the beam path. ### Claim 4 (depends on 1) The microscope of claim 1 wherein at least part of the filters are designed to cover two or more segments of the first part of segments. ### Claim 5 (depends on 1) The microscope of claim 1 wherein the filters are monolithic layers applied on a substrate. ### Claim 6 (depends on 1) The microscope of claim 1, wherein the means for deflecting light comprise at least one mirror, arranged so as to be displaceable along the beam path, for the deflection of light reflected by one or several of the filters, onto at least one more filter in the filter wheel. ### Claim 7 (depends on 1) The microscope of claim 1, wherein the means for deflecting light comprise a number of closable diaphragms, corresponding at least to the number of divided circles, arranged in front of or behind the filters for suppressing unwanted light. ### Claim 8 (depends on 1) The microscope of claim 1, wherein the filter wheel device comprises at least one more mirror, preferably arranged so as to be displaceable along the beam path, that is arranged in the beam path behind the at least one filter wheel and is designed to reflect the light onto another camera with a planar detector. ### Claim 9 (depends on 1) The microscope of claim 1, wherein the means for deflection comprise a reflection prism that can be introduced into the beam path for displacing the incident beam before it hits the filter wheel, and/or are designed to completely reflect those areas of the segments of the first part of segments that are not covered by the filters. ### Claim 10 (depends on 1) The microscope of claim 1, wherein the means for deflecting light comprise a fully mirror-coated wheel rigidly connected to the shaft and positioned at a specified distance to the at least one filter wheel, and wherein the mirror-coated wheel and the filter wheel can be displaced together on the shaft between specified positions. ### Claim 11 (depends on 1) The microscope of claim 1 wherein one segment each of a second part of segments is arranged between the segments of the first part, the segments of the second part being designed to be reflective. ### Claim 12 (depends on 11) The microscope of claim 11, wherein the filter wheel device comprises a light-sensitive detector coupled to the control system, for the detection of light reflected by all filters of the filter wheel that are in the beam path at a time, and wherein the control system uses variations in intensity for controlling the rotational frequency or the frame rate. ### Claim 13 (depends on 1) The microscope of claim 1, wherein the filter wheel device is provided with means for coupling illuminating light. ### Claim 14 (depends on 1) The microscope of claim 1, wherein the filter wheel device comprises at least one second filter wheel, with the at least one second filter wheel being rotatable against the first filter wheel or against the sense of rotation of the shaft, for aligning the filters of the filter wheels with each other. ### Claim 15 (depends on 1) The microscope of claim 1, wherein the filters are inserted in suitable openings of the filter wheel. ### Claim 16 (depends on 1) The microscope of claim 1, wherein the shaft has at least one click-in position for receiving the filter wheel. ### Claim 17 (depends on 1) The microscope of claim 1, wherein the filter wheel is displaceable between different click-in positions on the shaft. ### Claim 18 (depends on 1) The microscope of claim 1, wherein the shaft is mounted so as to be displaceable normal to its axis of rotation. ### Claim 19 A microscope for widefield microscopy with a detection beam path and an illumination beam path, comprising: a filter wheel device including a filter wheel mounted on a motor-driven shaft so as to be rotatable about an axis at a specified rotational frequency, the shaft having at least one click-in position for receiving the filter wheel with the filter wheel being displaceable between different click-in positions on the shaft, the filter wheel arranged in the detection beam path, or in the detection beam path and the illumination beam path, the filter wheel being divided into a plurality of segments, a first plurality of filters forming a first divided circle being arranged in at least a first part of the segments, so that each filter in the first plurality of filters is successively introduced into the detection beam path or the illumination beam path when the filter wheel is rotated, and a second plurality of filters forming at least one more divided circle, arranged in at least the first part of the segments, so that the segments of the first part contain at least two filters arranged in succession in a radial direction, the filter wheel device further comprising a light deflecting element arranged to deflect light reflected by a first filter in a segment of the first part of segments onto a second filter in the same segment; a camera with a planar detector in the detection beam path, designed to record images at a specified frame rate; and a control system for synchronizing the frame rate and the rotational frequency depending on the filters arranged on the filter wheel.