Observation device, observation system, and method for controlling observation device

1 . An observation device, comprising:

a housing including a transmission window on an upper side thereof and through which a sample is to be observed, the transmission window constituting a mounting surface on which the sample is to be mounted for observation;

an illumination system that is disposed in the housing on a downward side of the transmission window and emits illumination light from the downward side toward an upward side of the transmission window, such that in a state in which the sample is mounted on the transmission window, the illumination system emits illumination light from a downward side of the sample toward an upward side of the sample;

an imaging system that is disposed in the housing on the downward side of the transmission window and, in the state in which the sample is mounted on the transmission window, images the sample with transmitted light, the transmitted light being a portion of the illumination light emitted from the illumination system that is reflected onto the upward side of the sample from a reflective surface disposed above the sample and is transmitted through the sample and the transmission window from the upward side of the sample toward the downward side of the transmission window, to reach the imaging system; and

a control unit that executes imaging control using the illumination system and the imaging system in accordance with set imaging conditions, and controls an exposure amount in correspondence with a required time for the imaging control which includes a required operation time and a required pause time which are dependent on the set imaging conditions,

wherein the control unit:

determines, based on the set imaging conditions for the imaging control, the required time for the imaging control, the required time including the required operation time and the required pause time,

determines whether or not the required time exceeds a threshold, and

in response to a determination that the required time exceeds the threshold:

updates at least one of the imaging conditions to obtain new imaging conditions so that a new required time determined based on the new imaging conditions falls within the threshold, and

controls the exposure amount based on the new imaging conditions.

2 . The observation device according to claim 1 , wherein

the observation device performs time-lapse imaging in which the imaging control is repeatedly executed at an interval set in advance, and

the threshold is the interval.

3 . The observation device according to claim 2 , wherein

in response to the determination that the required time exceeds the interval, the control unit

updates a parameter of autofocus which is included in the imaging conditions so that the new required time falls within the interval, and

controls an exposure amount during a period of the autofocus based on the new imaging conditions.

4 . The observation device according to claim 3 , wherein

the parameter of the autofocus is a frame rate of the autofocus.

5 . The observation device according to claim 3 , wherein

the parameter of the autofocus is illumination luminance during the period of the autofocus.

6 . The observation device according to claim 1 , wherein

in response to the determination that the required time exceeds the threshold, the control unit updates an illumination luminance included in the imaging conditions so that the new required time falls within the threshold.

7 . The observation device according to claim 1 , wherein

the control unit estimates the required pause time based on the required operation time.

8 . The observation device according to claim 7 , wherein

the required operation time includes time required for movement of the imaging system, time required for autofocus, and time required for imaging.

9 . The observation device according to claim 7 , wherein

the control unit acquires a temperature of a surrounding environment in which the observation device is disposed, and further estimates the required pause time based on the acquired temperature of the surrounding environment.

10 . The observation device according to claim 1 , further comprising:

a reflecting member comprising the reflective surface that reflects the illumination light onto the upward side of the sample.

11 . An observation system, comprising:

an observation device; and

a control device that controls the observation device, wherein

the observation device includes

a housing including a transmission window on an upper side thereof and through which a sample is to be observed, the transmission window constituting a mounting surface on which the sample is to be mounted for observation,

an illumination system that is disposed in the housing on a downward side of the transmission window and emits illumination light from the downward side toward an upward side of the transmission window, such that in a state in which the sample is mounted on the transmission window, the illumination system emits illumination light from a downward side of the sample toward an upward side of the sample, and

an imaging system that is disposed in the housing on the downward side of the transmission window and, in the state in which the sample is mounted on the transmission window, images the sample with transmitted light, the transmitted light being a portion of the illumination light emitted from the illumination system that is reflected onto the upward side of the sample from a reflective surface disposed above the sample and is transmitted through the sample and the transmission window from the upward side of the sample toward the downward side of the transmission window, to reach the imaging system, and

the control device executes imaging control using the illumination system and the imaging system in accordance with set imaging conditions, and controls an exposure amount of the observation device in correspondence with a required time for the imaging control which includes a required operation time and a required pause time which are dependent on the set imaging conditions,

wherein the control device:

determines, based on the set imaging conditions for the imaging control, the required time for the imaging control, the required time including the required operation time and the required pause time,

determines whether or not the required time exceeds a threshold, and

in response to a determination that the required time exceeds the threshold:

updates at least one of the imaging conditions to obtain new imaging conditions so that a new required time determined based on the new imaging conditions falls within the threshold, and

controls the exposure amount based on the new imaging conditions.

12 . A method for controlling an observation device, the observation device comprising (a) a housing including a transmission window on an upper side thereof and through which a sample is to be observed, the transmission window constituting a mounting surface on which the sample is to be mounted for observation, (b) an illumination system that is disposed in the housing on a downward side of the transmission window and emits illumination light from the downward side toward an upward side of the transmission window, such that in a state in which the sample is mounted on the transmission window, the illumination system emits illumination light from a downward side of the sample toward an upward side of the sample, and (c) an imaging system that is disposed on the downward side of the transmission window and, in the state in which the sample is mounted on the transmission window, images the sample with transmitted light, the transmitted light being a portion of the illumination light emitted from the illumination system that is reflected onto the upward side of the sample from a reflective surface disposed above the sample and is transmitted through the sample and the transmission window from the upward side of the sample toward the downward side of the transmission window, to reach the imaging system, the method comprising:

executing imaging control using the illumination system and the imaging system in accordance with set image conditions, and controlling an exposure amount in correspondence with a required time for the imaging control including a required operation time and a required pause time which are dependent on the set imaging conditions;

wherein controlling the exposure amount comprises:

determining, based on the set imaging conditions for the imaging control, the required time for the imaging control including the required operation time and the required pause time;

setting the imaging conditions so that the required time falls within a threshold; and

controlling the exposure amount in accordance with the set imaging conditions.

13 . The observation device according to claim 1 , wherein

the observation device performs time-lapse imaging in which the imaging control is repeatedly executed at an interval set in advance, and

the threshold is time shorter than the interval.

14 . The observation device according to claim 1 , wherein

the required operation time is an amount of time required for the observation device to operate in accordance with the set imaging conditions to perform imaging of the sample, and the required pause time is an amount of time required for cooling by releasing heat generated by the observation device operating to perform the imaging during the required operation time.

15 . An observation device, comprising:

an illumination system that is disposed on a downward side of a sample and emits illumination light from the downward side toward an upward side of the sample;

an imaging system that is disposed on the downward side of the sample and images the sample with transmitted light that is reflected on the upward side in the illumination light emitted from the illumination system and is transmitted through the sample from the upward side to the downward side; and

a control unit that executes imaging control using the illumination system and the imaging system, and controls an exposure amount in correspondence with required time for the imaging control which includes required operation time and required pause time determined based on imaging conditions,

wherein

when the required time exceeds a threshold, the control unit

updates the imaging condition so that a new required time determined based on the updated new imaging conditions falls within the threshold, and

controls the exposure amount based on the new imaging conditions,

wherein

the observation device performs time-lapse imaging in which the imaging control is repeatedly executed at an interval set in advance, and

the threshold is the interval,

wherein

when the required time exceeds the interval, the control unit

updates a parameter of autofocus which is included in the imaging conditions so that the new required time falls within the interval, and

controls an exposure amount during a period of the autofocus based on the new imaging conditions, and

wherein

the parameter of the autofocus is illumination luminance during the period of the autofocus.

16 . An observation device, comprising:

an illumination system that is disposed on a downward side of a sample and emits illumination light from the downward side toward an upward side of the sample;

an imaging system that is disposed on the downward side of the sample and images the sample with transmitted light that is reflected on the upward side in the illumination light emitted from the illumination system and is transmitted through the sample from the upward side to the downward side; and

a control unit that executes imaging control using the illumination system and the imaging system, and controls an exposure amount in correspondence with required time for the imaging control which includes required operation time and required pause time determined based on imaging conditions,

wherein

when the required time exceeds a threshold, the control unit

updates the imaging condition so that a new required time determined based on the updated new imaging conditions falls within the threshold, and

controls the exposure amount based on the new imaging conditions, and

wherein

the control unit updates the illumination luminance included in the imaging conditions so that the new required time falls within the threshold when the required time exceeds the threshold.