12
Impinging light illumination system
The impinging light illumination system is made in the form of a detachable module — a fluorescent illuminator (fig. 2, 15). The
module is installed with a lower flange into the microscope stand seat and is fixed with a screw (fig. 4, 7). A mercury-filled lamp
flashlight is fixed on the illuminator (fig. 1, 8).
The fluorescent illuminator (fig. 2, 15) comprises a six-seat turret with 5 spectral beam splitting units and a free seat for
transmitted light. Seats are numbered and provided with captions that contain information about spectral characteristics of
filters and a dichroic mirror (a beam splitter) given in table.
Excitation filter
Dichroic mirror
Cut-off filter
Unit designation
No.1
Free seat
No.2
510—560
575
590
G
No.3
450—490
505
520
B
No.4
400—440
455
470
BV
No.5
380—420
430
450
V
No.6
330—380
400
420
U
Marking of beam splitting units complies with color of beam of rays exciting fluorescence of examined objects.
For example, when a carriage is in "G" position, a green spectral region of 510—560nm is identified from the total radiation flux
of the mercury-filled lamp, and when it is in "B" position — a spectral region of 450—490nm (blue) is identified.
The illuminator comprises field and aperture diaphragms (FD and AD). The field diaphragm is equipped with an alignment
device (fig. 1, 4), the position adjustment knobs are located on the illuminator casing on the right and left. The knob (fig. 1, 5)
adjusts field diaphragm opening, the knob (fig. 1, 6) adjusts aperture diaphragm opening. To change the diaphragm dimensions,
knobs (fig. 1, 5 and 6) are pushed into the casing. A plug to intercept light that is controlled by a knob is installed closer to the
flashlight in the illuminator casing.
Mercury-filled lamp flashlight
The mercury-filled lamp flashlight (fig. 1, 8) is fixed on the illuminator with a bayonet ring as the adjusting ring (fig. 5, 7) and
the fixator (fig. 5, 8) are brought closer to the illuminator end.
WARNING! PRIOR TO REMOVAL OF THE FLASHLIGHT FROM THE HEAD CASING, IT IS NECESSARY TO DISCONNECT THE
MERCURY-FILLED LAMP POWER SUPPLY UNIT FROM THE GRID!
The mercury-filled lamp is aligned by knobs (fig. 1, 10 and 11). Knob 10 serves to move the holder with the lamp in vertical
direction, and knob 11 — to move it in horizontal direction. The flashlight detachable cap (fig. 5, 1) is fixed with a screw (fig. 1, 9),
on the inner side of which there is a mercury-filled lamp holder. The mercury-filled lamp (fig. 5, 4) is installed into bushings (fig. 5,
2 and 5) and is fixed by screws (fig. 5, 3 and 6).
WARNING! FOR MICROSCOPE TRANSPORTATION, REMOVE THE MERCURY-FILLED LAMP FROM THE FLASHLIGHT.
Inside the flashlight, there is a collector projecting the mercury-filled lamp discharge arc image into the exit pupil of the
objective installed in the path of rays. Knob 7 (fig. 1) adjusts collector position along the illuminator axis.
1
Mercury-filled lamp flashlight
detachable cap
2
Bushing
3
Screw
4
Mercury-filled lamp
5
Bushing
6
Screw
7
Adjusting ring
8
Fixator
Fig. 5: Mercury-filled lamp flashlight
