Electric heating – Heating devices – With heater-unit housing – casing – or support means
Patent
1995-12-29
1998-02-10
Walberg, Teresa J.
Electric heating
Heating devices
With heater-unit housing, casing, or support means
219542, 359512, H05B 306
Patent
active
057171904
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to a transparent heating plate and a transparent heating device for heating an object examined or a culture dish, put on them. Specifically, this invention relates to a transparent heating plate which is attached to or put on the stage of a microscope and used for examination of a specimen under a microscope. More specifically, this invention relates to a transparent heating plate for microscope and transparent heating device for microscope which can control the temperature of a specimen to its optimum temperature.
BACKGROUND ART
Artificial insemination is conventionally put in practice for breeding of a stock. It also has been put in practice for the human race for the purpose of treating infertility. For such artificial insemination, it is necessary to examine the vitality and appearance of the sperm to be introduced with a microscope and confirm the faultlessness of the sperm beforehand. Since sperm generally has the optimum activity at 37.degree. to 38.degree. C., though it varies according to the species of animals, it is preferable to perform the examination at this temperature.
For this purpose, the inventors of this invention proposed a heating device for microscopic examination described in J.P.A.62 (1987)-135,803. This heating device comprises a heater stage and a heating means. The heater stage has a transparent conductive film between top and bottom transparent glass plates.
Although the above device has a sufficient effect, request for a circular heater stage, for example, has recently arisen for the shape of the heater stage, corresponding to the configurations of microscopes. When a pair of opposite electrodes are formed along the circumference of the glass plate (transparent plate) in the circular transparent heating plate, regions without an electrode are formed outside the ends of the electrodes, and these regions are not heated Contrarily, cooling occurs from these regions not heated, which causes instability of the temperature on the central part of the plate or a nonuniform temperature distribution on the central part. The regions without an electrode outside the ends of the electrodes become smaller and the heated area increases by forming electrodes larger. However, since the distance between the ends of the electrodes which come closer to each other is smaller than that between the other part of the electrodes, a larger electric current flows and an excessive heating can occur. The phenomenon that the temperature between the ends of the electrodes becomes higher than that of the central part on the contrary to the above description, was discovered by the inventors.
The first object of this invention is to provide a transparent heating plate which can heat the entire transparent conductive film between the electrodes with a small difference of temperature, if it is a circular transparent heating plate.
Further, an inverted microscope recently has come into wide use. Since the lens system is disposed below the stage in an inverted microscope, it is preferable that a through hole is formed at the central part of the stage. By the through hole thus formed, checking of the magnification lens of an inverted microscope is made easier. Further, it is preferable to form a through hole at substantially the central part of the transparent heating plate for microscope, too. However, when a through hole is formed at substantially the central part of the transparent heating plate, the transparent heating element is cut, and the current flow in the transparent heating element around the hole becomes insufficient. Particularly, regions where the current flow is insufficient are formed at the part around the through hole opposite to each electrode, as ensured by the inventors. The inventors therefore considered that it is important to improve heating near the through hole, because the part used for examination is the vicinity of the center of the plate, and IN addition for reducing the effect of the cooling by air caused by forming the through hole a
REFERENCES:
patent: 3833451 (1974-09-01), Wagner
patent: 4361751 (1982-11-01), Criss et al.
patent: 4820902 (1989-04-01), Gillery
patent: 4844985 (1989-07-01), Pharms et al.
patent: 4918288 (1990-04-01), Carter et al.
patent: 4957358 (1990-09-01), Terada et al.
Kabushiki Kaisha Kitazato Supply
Valencia Raphael
Walberg Teresa J.
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