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A microscope having little damage such as deformation, discoloration or the like given to a sample is disclosed. This microscope comprises an illuminance reducing unit for reducing illuminance of an illumination light on the sample. Assuming that a time width where illuminance is at a level enough f

A microscope having little damage such as deformation, discoloration or the like given to a sample is disclosed. This microscope comprises an illuminance reducing unit for reducing illuminance of an illumination light on the sample. Assuming that a time width where illuminance is at a level enough for displaying an image of the sample is TF,a time width where illuminance is lower than the level enough for displaying an image of the sample is TN,and a value α is as follows: α=TF/(TF+TN) the value α is changed according to a velocity of a stage or the like. A monitor displays a still picture of the sample for a period of TN,the still picture being one before the time width TN.

대표청구항 ▼

A microscope having little damage such as deformation, discoloration or the like given to a sample is disclosed. This microscope comprises an illuminance reducing unit for reducing illuminance of an illumination light on the sample. Assuming that a time width where illuminance is at a level enough f

A microscope having little damage such as deformation, discoloration or the like given to a sample is disclosed. This microscope comprises an illuminance reducing unit for reducing illuminance of an illumination light on the sample. Assuming that a time width where illuminance is at a level enough for displaying an image of the sample is TF,a time width where illuminance is lower than the level enough for displaying an image of the sample is TN,and a value α is as follows: α=TF/(TF+TN) the value α is changed according to a velocity of a stage or the like. A monitor displays a still picture of the sample for a period of TN,the still picture being one before the time width TN. nal-type main signal; and a repeater to receive a main signal from the optical transmission device to transfer the main signal toward a reception device for a main signal, wherein the repeater has an automatic level controller to perform average level constant control on the main signal received from the optical transmission device and then output the main signal toward the reception device, the optical transmission device comprising an average level detector, having a detection band width equivalent to a response speed of the automatic level controller, to detect an average level detection signal, representing an average level of a main signal obtained before the electrical signal type is converted into the optical signal type, from the main signal, the automatic level controller performs the average level constant control with reference to the average level detection signal detected by the average level detector. 3. An optical communication system according to claim 1, wherein the automatic level controller adjusts the amplitude of the average level detection signal depending on an output level of the main signal output from the automatic level controller. 4. An optical communication system according to claim 1, wherein the optical transmission device further comprises a delay unit to fixedly delay time from when the electric-signal-type main signal is converted into an optical-signal-type main signal to when the main signal is transmitted toward the repeater. 5. An optical communication system according to claim 4, wherein the delay unit is a distribution compensation fiber. 6. An optical communication system according to claim 2, wherein the optical transmission device further comprises a delay unit to fixedly delay time from when the electric-signal-type main signal is received by the optical transmission device to when the main signal is converted into an optical-signal-type main signal. 7. An optical communication system according to claim 1, wherein the average level detector detects an electric-signal-type average level detection signal, and the optical transmission device converts the electric-signal-type average level detection signal into an optical-signal-type signal to transmit the optical-signal-type signal toward the repeater. 8. An optical communication system according to claim 7, wherein the optical transmission device multiplexes the optical-signal-type main signal and the optical-signal-type average level detection signal to transmit a multiplexed signal toward the repeater. 9. An optical communication system according to claim 7, wherein the average level detector detects an analog electric-signal-type average level detection signal, the optical transmission device converts the analog-signal-type average level detection signal into a digital electric-signal-type average level detection signal and converts the signal into an optical-signal-type signal to transmit the signal toward the repeater, the repeater converts the optical-signal-type average level detection signal received from the optical transmission device into a digital electric-signal-type signal, and the automatic level controller converts the digital-signal-type average level detection signal into an analog electric-signal-type signal. 10. An optical communication system according to claim 1, wherein the optical transmission device transmits a frame pulse synchronized with the main signal toward the repeater, and the automatic level controller adjusts phases of the main signal and the average level detection signal on the basis of the frame pulse transmitted from the optical transmission device. 11. An optical communication system comprising: an optical transmission device to convert a plurality of electric-signal-type main signals into optical-signal-type main signals to transmit the main signals; and a repeater to receive the plurality of main signals transmitted from the optical transmi ssion device to transmit the main signals toward the reception device for the main signals, wherein the optical transmission device comprises: a plurality of electric/optical converters to convert the plurality of electric-signal-type main signals into the optical-signal-type main signals; a multiplexer to generate a multiplexed main signal obtained by multiplexing the plurality of main signals converted into the optical-signal-type main signals by the plurality of electric/optical converters; a first automatic level controller to perform average level constant control on the multiplexed main signal to transmit the resultant main signal toward the repeater; and an average level detector to detect an average level signal representing an average level of the multiplexed main signal from the multiplexed main signal, the repeater comprises a second automatic level controller to perform average level constant control on the multiplexed main signal received from the optical transmission device to output the multiplexed main signal toward the reception device, the average level detector has a detection band width equivalent to response speeds of the first automatic level controller and the second automatic level controller, and the first automatic level controller and the second automatic level controller perform the average level constant control with reference to the average level detection signal. 12. An optical communication system comprising: an optical transmission device to convert a plurality of electric-signal-type main signals into optical-signal-type main signals to transmit the main signals; and a repeater to receive the plurality of main signals transmitted from the optical transmission device to transmit the main signals toward a reception device for the main signals, wherein the optical transmission device comprises: a plurality of electric/optical converters to convert the plurality of electric-signal-type main signals into optical-signal-type main signals; a multiplexer to generate a multiplexed main signal obtained by multiplexing the main signals converted into the optical-signal-type main signals by the plurality of electric/optical converters; a first automatic level controller to perform average level constant control to the multiplexed main signal to transmit the resultant main signal toward the repeater; and an average level detector to detect average level signals of the electric-signal-type main signals from the main signal to add the average level signals to each other, the repeater has a second automatic level controller to perform average level constant control on the multiplexed main signal received from the optical transmission device to output the multiplexed main signal toward the reception device, the average level detector has a detection band width equivalent to response speeds of the first automatic level controller and the second automatic level controller, and the first automatic level controller and the second automatic level controller perform the average level constant control with reference to an addition result obtain by the average level detector. 13. An optical communication system according to claim 12, wherein the average level detector corrects an amplitude of the average level signal detected from each of the electric-signal-type main signals and adds the corrected average level signal. 14. An optical signal control method used with an optical communication system comprising an optical transmission device to convert an electric-signal-type main signal into an optical-signal-type signal, and a repeater to receive a main signal from the optical transmission device to transfer the main signal toward a reception device for a main signal, the method comprising: performing average level constant control on the main signal received from the optical transmission device and then outputting the main signal toward the reception device, detecting an average le