Optical: systems and elements – Compound lens system – Microscope
Patent
1993-08-04
1996-09-24
Hantis, K.
Optical: systems and elements
Compound lens system
Microscope
G02B 2106
Patent
active
055596312
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a method for controlling the brightness in a manner independent of color and/or for controlling the color temperature in a manner independent of brightness for a microscope illumination system, as well as to an apparatus for carrying out the method.
In illumination apparatuses which exhibit an incandescent lamp, it is known for the brightness of the light emitted by a light source to be controlled by the lamp voltage being altered by means of an electrical circuit. However, control of the lamp voltage involves the disadvantage that the color temperature of the illumination light is altered at the same time thereby. A photographic exposure is possible under these light conditions only if chromatic defects in the subsequent photographic image are tolerated.
German Patent Publications DE-OS 2,757,543 and DE-UM 8,802,996 disclose apparatuses which preclude these defects. Both apparatuses exhibit a light source, a condenser system and an annular light guide. To control the illumination intensity, in DE-OS 2,757,543 a diaphragm slide is provided, which can be partially inserted into the illumination beam path between the individual condensers and thus covers a part of the beam. In DE-UM 8,802,996, to control the illumination intensity an opaque and displaceably arranged carrier with various perforated rasters is provided in front of the light entrance surface of the light guide. Since the light guide is designed to be homogeneous in its interior, the light exit surface of the light guide exhibits a uniform light intensity distribution. With such illumination apparatuses, control of the illumination intensity without alteration of the color temperature of the light is possible. However, it is disadvantageous that, besides a considerable expenditure on precision mechanisms, the total illumination intensity is also reduced by the light guide.
German Patent Publication DE-OS 2,745,397 discloses a light controller for light guide lamps with a multiplicity of individual fibers. To this end, a diaphragm made from a plurality of circular-sector surfaces is disposed in the illumination beam path between the lamp and the light entrance surface of the light guide.
To control the illumination intensity, these circular-sector surfaces are displaced with a handle relative to one another in such a manner that the illumination beam is cut asymmetrically in a disadvantageous manner. Furthermore, the region of high attenuation factors may be set only imprecisely.
German patent Publication DE-OS 2,701,764 discloses a light flux controller for controlling the brightness of illumination apparatuses for microscopes. This controller exhibits a carrier and a stationary family, disposed in the direction of the light, of light-transmitting channels. The carrier is disposed to be pivotable in the illumination beam path by means of a swivel apparatus. However, this apparatus is of very large dimensions and requires, as a result of the swivel apparatus, additional space in the illumination beam path of the microscope.
SUMMARY OF THE INVENTION
Accordingly, the object of the invention is to provide a method and an apparatus for a controllable illumination device for a microscope illumination system, in which the efficiency of the observation light which is usable for observation is optimized and, in addition, the possibility for controlling the brightness in a manner independent of color over a large control range and/or the possibility for controlling the color temperature of the illumination light in a manner independent of brightness are intended to be provided in a user-friendly manner.
In an apparatus for carrying out the methods according to the invention, beside the main light source there is provided a secondary light source with a color filter and a regulating device to control the two lamp currents, the regulating device setting the respective current for the two lamps at the same time by means of the controller so that: color, the brightness of the main light source is contro
REFERENCES:
patent: 4233650 (1980-11-01), Hagner et al.
patent: 4361863 (1982-11-01), Hagner
patent: 4641227 (1987-02-01), Kusuhara
patent: 4714823 (1987-12-01), Spruck et al.
patent: 5022744 (1991-06-01), Leiter
Patent Abstracts of Japan, vol. 7, No. 210, Sep., 1983 (P-233) (1355), JP 58-105208.
Gilbert Manfred
Remer Lucius
Schoenenborn Joerg
Hantis K.
Leica Mikroskopie und Systeme GmbH
LandOfFree
Method and apparatus for controlling the brightness and/or color does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for controlling the brightness and/or color, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for controlling the brightness and/or color will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1933298