JP2001092000A - Optical device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical device which possesses a fogging preventive means by which stains, damage and stripping or the like are not caused in an observation optical system and which is easily and also inexpensively repaired. SOLUTION: The optical device possesses a plane parallel plate 3 arranged on the outermost side of the observation optical system 1 and a heating means 5 to heat the plane parallel plate 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical device used in an environment where temperature and humidity greatly change, and more particularly to a means for preventing fogging of the optical device.

[0002]

2. Description of the Related Art Heretofore, the optical device has been fogged on the surface of the optical system due to a rapid change in temperature or humidity, and it has not been possible to immediately observe using the optical device. Further, in a bad environment, the fogging on the surface of the optical system grows due to condensation.
For this reason, the temperature of the entire optical device is raised by some kind of heating means to remove the fogging generated on the lens surface. Such techniques include, for example, Japanese Patent Laid-Open No. 1-1
Japanese Patent Application Laid-Open Nos. 85517 and 5-53077 disclose techniques. In this prior art, a transparent electrode is provided on the lens surface, a temperature sensor is added, and the temperature of the lens surface is controlled to remove the fogging and prevent the lens from being damaged by thermal expansion.

[0003]

In the above prior art, a voltage is applied to a transparent electrode to raise the temperature of the lens surface,
Clouding has been removed. However, after the fogging of the lens surface is removed, it often remains as a stain. this is,
If the cloud grows into condensation, the amount remaining will be greater. It goes without saying that this stain deteriorates the observed image. In such a case, cleaning is performed using clean paper or the like. However, there is a problem that when the cleaning is performed until the stain is removed, the transparent electrode is peeled off. Further, the lens surface may be damaged. In addition, in a constant temperature room, particularly in a case where the temperature is 0 ° C. or less, the eyepiece always becomes cloudy due to the breathing breath from the observer. Since the haze is 0 ° or less, the cloud becomes ice and forms on the lens surface, and is melted by a heater to become water droplets. As described above, when the repetitive phenomenon occurs, cleaning with the clean paper not only peels off the transparent electrode but also causes fatal damage to the lens. When the temperature of the lens surface increases, the radius of curvature of the lens also changes. Therefore, if you use a high-precision lens,
The phenomenon of image blurring occurred. Furthermore, if the surface temperature varies at a high temperature, there is a problem in that a fatal state of image blur occurs.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and an object of the invention according to claims 1, 2 or 3 is to prevent the observation optical system from being stained, scratched or peeled off. It is an object of the present invention to provide an optical device which can be easily and inexpensively repaired.

[0005]

In order to solve the above-mentioned problems, the invention according to claim 1, 2 or 3 is directed to an optical apparatus, comprising: a plane parallel plate disposed on the outermost side of an observation optical system; Heating means for heating the flat plate.

In the optical device according to the first, second or third aspect, the fogging or dew adhering to the parallel flat plate disposed on the outermost side of the observation optical system is prevented or removed by heating by the heating means. When the parallel flat plate is damaged and cannot be used, it can be removed from the observation optical system and replaced.

In the optical device according to the second aspect of the present invention, in addition to the above-mentioned operation, the heating means is a heater for heating the holding member for holding the parallel flat plate, so that the heat of the heater is transmitted to the holding member. The parallel flat plate is heated from the outer periphery.

[0008] In the optical device according to the third aspect of the present invention, in addition to the above operation, the heating means is a transparent electrode provided on the surface of the parallel plane plate, and a protection member for protecting the transparent electrode is provided by the transparent electrode. Due to the arrangement on the surface, the heat generated by the transparent electrode directly raises the temperature of the parallel flat plate and the protective member.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An optical device provided with the anti-fogging means of the present invention is located on the outermost side of an observation optical system. Fogging and dew condensation occur due to a difference in temperature and humidity between the outside air and the optical device. Therefore, in order to effectively prevent fogging and the like, it is desirable to dispose the fogging preventing means on the outermost side of the observation optical system. Further, by arranging it on the outermost side, even in a bad environment such as dew condensation, cleaning with clean paper or the like is possible. In addition, such an arrangement can be easily replaced when the fogging prevention means is broken. In addition, since the fogging prevention glass uses a parallel plane glass and is heated by some heating means, unlike a thick glass such as a lens, the temperature reaches a predetermined temperature in a short time and the fogging is prevented. Prevention and removal can be performed.
Furthermore, since the fogging prevention glass is a plane-parallel glass, the effect of heat on an image is much smaller than that of a lens.

In the embodiment of the present invention, an example in which an optical device is applied to an eyepiece of a microscope will be described. However, the present invention is not limited to this, and an optical device having an observation optical system, for example, a telescope , Binoculars, camera viewfinders, etc. Hereinafter, specific embodiments will be described.

(Embodiment 1) FIG. 1 shows Embodiment 1 and is a longitudinal sectional view of an eyepiece of a microscope. In FIG. 1, an eyepiece is an observation optical system 1 including a plurality of lenses.
Are arranged on the inner periphery of the lens frame 2. Outer diameter A of fitting of lens frame 2
Is fitted and attached to the lens barrel of the microscope. Outer diameter A
On the opposite side is the pupil position IP. Observation optical system 1 and I
-Glass 3 for fogging prevention as a parallel plane plate between P
Is provided, and the outer periphery of the fogging prevention glass 3 is held by a metal frame 4 as a holding member, and the metal frame 4 is attached to the mirror frame 2. The metal frame 4 is made of a material having good heat conductivity, and a heater 5 as a heating means is continuously provided on the outer periphery of the metal frame 4. The heater 5 can be connected to a power supply of a microscope (not shown) by a cable 6.

When the cable 6 is connected to the power supply of the microscope and power is supplied to the heater 5, heat is generated, and the generated heat is conducted through the metal frame 4 to raise the temperature of the anti-fog glass 3 from the outer periphery.
As a result, it is possible to prevent or remove fogging and dew condensation caused by the temperature and humidity of the outside air on the fogging prevention glass 3.

According to this embodiment, since the fogging prevention glass is provided on the outermost side of the observation optical system, no fogging or dew condensation occurs in the observation optical system, and the observation optical system does not have stains, scratches, peeling, etc. Does not occur. Further, since the fogging prevention glass is disposed on the outermost side of the observation optical system, it can be cleaned with clean paper or the like, and even if damaged, it can be easily replaced and repaired at low cost.

(Embodiment 2) FIG. 2 shows the fogging prevention means of the embodiment 2, (a) is a front view of the fogging prevention means,
(B) is a side view of the fogging prevention means. This anti-fogging means is used in place of the anti-fogging glass shown in FIG. 1 of the first embodiment and attached to the outermost side of the observation optical system of the eyepiece.

In FIG. 2, a transparent electrode 12 which generates heat as a heating means is deposited on a substrate glass 11 as a plane parallel plate. Terminals 13 made of nickel chrome are deposited on both upper and lower ends of the transparent electrode 12, and a cable 14 is connected to the terminal 13. Transparent electrode 12
A transparent glass plate 15 as a protective member is fixed to the upper surface of the terminal 13 and the transparent electrode 12 is sandwiched between the substrate glass 11 and the transparent glass plate 15.
A cable 14 is connected to both terminals 13, and the cable 14 can be connected to a power supply of a microscope (not shown).

The cable 14 is connected to the power supply of the microscope, and power is supplied to the transparent electrode 12, so that the sandwiched transparent electrode 12 is heated, and the substrate glass 11 in close contact therewith is heated.
In addition, the heat is immediately transmitted to the transparent glass plate 15 to increase the temperature, thereby preventing and removing fogging.

According to the present embodiment, since the antifogging means is provided on the outermost side of the observation optical system, no fogging or dew condensation occurs in the observation optical system, and the observation optical system is free from stains, scratches, peeling, and the like. It does not occur. Further, since the transparent electrode of the means for preventing fogging is sandwiched between two glass plates, the transparent electrode deposited by the cleaning work is not damaged. Even if the glass plate is scratched or damaged, only the fogging prevention means needs to be replaced, and the glass plate can be repaired at low cost.

[0018]

According to the first, second or third aspect of the present invention, the fogging and dew adhering to the parallel flat plate disposed on the outermost side of the observation optical system are prevented or removed by heating by the heating means. There is no occurrence of spots, scratches, peeling, etc. on the observation optical system. Further, when the parallel flat plate is damaged and cannot be used because it cannot be used, it can be removed from the observation optical system and replaced, so that repair can be performed easily and at low cost. In the invention according to claim 2, in addition to the above effects, the heat of the heater conducts through the holding member to raise the temperature of the parallel flat plate from the outer periphery, so that the surface of the parallel flat plate is uniformly prevented or removed from fogging and dew. be able to. According to the third aspect of the invention, in addition to the above effects, the heat generated by the transparent electrode directly raises the temperature of the parallel flat plate and the protection member, so that the temperature of the parallel flat plate is increased quickly. Further, since the transparent electrode is protected by the protective member, the transparent electrode is not damaged.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an eyepiece of a microscope according to a first embodiment.

FIGS. 2A and 2B show a fogging prevention means according to a second embodiment, wherein FIG. 2A is a front view of the fogging prevention means and FIG. 2B is a side view of the fogging prevention means.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Observation optical system 3 Fogging prevention glass 5 Heater

Claims (3)

[Claims] 1. An optical apparatus comprising: a plane parallel plate disposed on the outermost side of an observation optical system; and heating means for heating the plane parallel plate. 2. The optical device according to claim 1, wherein the heating unit is a heater that heats a holding member that holds the plane-parallel plate. 3. The heating means is a transparent electrode provided on the surface of the plane-parallel plate, and a protection member for protecting the transparent electrode is provided on the surface of the transparent electrode. 2. The optical device according to 1.