JP2000066112A - Telescope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a telescope which may be easily produced, embodies a stable UV cut effect and allows the observation of an objective by a good observation image without affecting the spectral transmittance in a visible light region by forming at least part of the optical elements forming an observation optical system of optical resin materials including UV absorptive materials. SOLUTION: At least part of the optical elements of the telescope having the observation optical system consisting of the plural optical elements are formed of the optical resin materials including the UV absorptive materials. For example, a meniscus lens 5 which is part of the optical elements constituting the eyepiece optical system 2 is arranged in a position not exposed to the outside of binoculars 1, i.e., in the space between the eyepiece optical system 2 and an erecting optical system 3. This meniscus lens 5 is formed of a PMMA resin which is the optical resin material including the UV absorptive material. As a result, the UV cut effect for absorbing UV rays from the incident luminous fluxes on the observation optical system may be obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a telescope, and more particularly to a telescope in which an observation optical system includes a plurality of optical elements.

[0002]

2. Description of the Related Art A general observation optical system of a telescope such as a monocular or a binocular includes a plurality of optical elements.
Since ordinary telescopes have high light-gathering power, when used in environments with a lot of ultraviolet rays, for example, at the seaside in summer or in the mountains during the snowy season, harmful rays such as ultraviolet rays included in the light beam entering the observation optical system are observed. Adversely affect the eyes of the elderly.

Therefore, in the conventional telescope, various technical means (hereinafter referred to as UV cut means) for removing harmful rays such as ultraviolet rays from the light beam incident on the observation optical system have been proposed and put into practical use. ing. This U
As the V-cut means, for example, a part of an optical element constituting the observation optical system is made of a member having an ultraviolet absorbing effect, for example, an optical material such as SF-based glass or LaSF-based glass having a high refractive index, PMMA, polycarbonate or the like. Means using a resin or the like, means for depositing a plurality of thin films on the surface of an optical element constituting an observation optical system, means for applying a so-called multilayer coating, and the like are generally put into practical use.

According to a telescope in which a part of the optical element constituting the observation optical system among the above-mentioned UV cut means is constituted by using a member capable of absorbing ultraviolet light, the light incident on the observation optical system is applied. It is possible to obtain an effect of removing ultraviolet rays, which are harmful rays, from the light flux and protecting the eyes of the observer. However, in this case, the optical design may be restricted due to difficulties in processing the optical glass and the like, and the optical glass itself is expensive. It is a factor that hinders.

[0005] Further, according to the means, it is extremely difficult to reliably control the absorption wavelength of ultraviolet light, so that a sufficient UV cut effect may not be obtained in some cases. Further, in the visible light wavelength region, ie, 400 nm (nanometer)
If the light absorption effect affects the wavelength region exceeding the wavelength range, the spectral transmittance will be affected, and thus the observed image will be colored and observed in yellow or blue-green. There are cases.

On the other hand, according to the above-mentioned UV cutting means for removing ultraviolet rays by applying a multilayer coating, there is no restriction on the optical design, and the wavelength range of the ultraviolet rays to be removed can be freely set. , It is possible to realize a sufficient UV cut effect.

[0007]

However, in a case where the above-mentioned UV cut means using a multilayer coating is configured to provide a thin film of, for example, TiO2, MgF2, SiO2, etc., it is necessary to realize a sufficient UV cut effect. Requires several tens of coating layers. Further, in this case, since the thickness of each layer of the thin curtain needs to be manufactured with an accuracy of about 10 nm, there is a problem that the manufacturing becomes very difficult.

[0008] The present invention has been made in view of the above-mentioned points, and it is an object of the present invention to be able to manufacture easily, to always realize a stable UV cut effect, and to further improve the visible light. An object of the present invention is to provide a telescope capable of observing an object with a good observation image without affecting spectral transmittance in a light region.

[0009]

To achieve the above object, a telescope according to a first aspect of the present invention is a telescope in which an observation optical system includes a plurality of optical elements, wherein at least a part of the optical elements includes an ultraviolet absorbing material. It is characterized by being formed of an optical resin material containing the same.

According to a second aspect of the present invention, in the telescope according to the first aspect, the optical element comprises one of a light refracting member or an optical axis changing member and the optical resin material,
The optical resin material is molded and fixed to one of the light refracting member and the optical axis changing member.

According to a third aspect, in the telescope according to the first aspect, the optical resin material is provided so as not to be exposed outside the telescope.

According to a fourth aspect, in the telescope according to the first aspect, the optical resin material is a member having no refractive power.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiments. In each of the embodiments described in detail below, a binocular is used as an example of a telescope in which an observation optical system includes a plurality of optical elements.

FIG. 1 is a configuration diagram showing only a simplified configuration of the observation optical system in the binoculars according to the first embodiment of the present invention. In the case of ordinary binoculars, it is common that two substantially identical observation optical systems are arranged on a target. For this reason, in FIG. 1, only the configuration of one of the two observation optical systems is shown, and the other is not shown.

The binoculars 1 of the present embodiment are so-called roof prism type prism binoculars using a roof prism as an erecting optical system as shown in FIG. This binoculars 1
The observation optical system is disposed at a position facing the eye of the observer when observing a desired object using the binoculars 1, and is an eyepiece that is a light refraction member including a plurality of optical elements (lenses). The optical system includes a lens optical system 2, an erecting optical system 3 including a roof prism as an optical axis changing member, and an objective lens optical system 4.

In a position not exposed to the outside of the binoculars 1, that is, in a space between the eyepiece optical system 2 and the erecting optical system 3, a part of the optical element constituting the eyepiece optical system 2 is provided. A meniscus lens 5 is arranged. The meniscus lens 5 is formed of a PMMA resin material (resin optical element), which is an optical resin material containing an ultraviolet absorber.

Normally, a meniscus type lens can be formed using a resin lens because of its low optical power. In addition, in designing and manufacturing a resin lens having a small optical power, the optical design is easier and the design flexibility is higher than in the case of a glass lens having a large optical power. It has the advantage of being large.

In view of the above, in the binoculars 1 of the present embodiment, the meniscus lens 5 constituting a part of the eyepiece optical system 2 is replaced with a PMMA including an ultraviolet absorbing material.
It is made of a resin material. This is configured to obtain a UV cut effect of absorbing ultraviolet light from a light beam incident on the observation optical system. In addition,
In this case, the setting of the wavelength at which the UV cut is to be performed can be freely set by adjusting the type and amount of the ultraviolet absorbing material mixed into the PMMA resin material as necessary. By mixing the ultraviolet absorber, the optical properties of the observation optical system in the visible wavelength range are not affected. Specific examples of the ultraviolet absorber include a hydroxybenzoate-based material, a cyanoacrylate-based material, and a benzotriazole-based material.

As described above, according to the first embodiment, the observation optical system can be easily formed by simply forming the meniscus lens 5 constituting a part of the eyepiece optical system with a resin optical element. The UV cut means capable of removing ultraviolet rays from the incident light beam can be configured very easily.

Further, a stable UV cut effect can be obtained without impairing the degree of freedom in optical design, and furthermore, since there is no complicated manufacturing process, it is possible to contribute to a reduction in manufacturing cost. it can.

Since the meniscus lens 5 formed of an optical resin material is arranged at a position not exposed to the outside in the observation optical system of the binoculars 1, the lens surface of the meniscus lens 5 may be damaged, It is possible to avoid dangers such as the attachment of harmful substances. Therefore, since the ultraviolet absorbing material mixed into the meniscus lens 5 is not deteriorated due to the external factors as described above, there is no fear that the optical properties are deteriorated, and it is possible to always obtain a stable UV cutting effect. it can.

FIG. 2 is a simplified diagram showing only the configuration of the observation optical system in the binoculars according to the second embodiment of the present invention. In FIG. 2, as in FIG. 1, only the configuration of one of the two observation optical systems is shown, and the other is not shown.

The binoculars 1A of this embodiment are prism binoculars of the so-called Porro prism type using a Porro prism as an erecting optical system as shown in FIG. The observation optical system of the binoculars 1A is arranged at a position facing the eyes of the observer when observing a desired object using the binoculars 1A, and is a light refracting member including a plurality of optical elements (lenses). , An eyepiece optical system 2A, an erecting optical system 3A composed of a plurality of Porro prisms and the like as an optical axis changing member, and an objective lens optical system 4A.

The Porro prism 6, which is a part of the optical element constituting the erecting optical system 3A, is an optical element disposed at a position not exposed to the outside of the binoculars 1, and is an optical resin material containing an ultraviolet absorbing material. Is formed of a PMMA resin material (resin optical element).

According to the present embodiment configured as described above, the first embodiment described above can be performed by a simple means of simply forming the Porro prism 6 constituting a part of the erecting optical system 3A by a resin optical element. The same effect as in the embodiment can be obtained.

In general, a Porro prism has the property that its optical path length becomes longer. Therefore, by forming the Porro prism 6 with a resin optical element containing an ultraviolet absorber as shown in the present embodiment, the UV cut effect is larger than in the case of the above-described first embodiment. Become.

Furthermore, since the Porro prism 6 formed of an optical resin material is arranged at a position not to be exposed to the outside of the binoculars 1, the surface of the Poro prism 6 is damaged, and harmful substances such as chemicals are removed. There is little danger of sticking. Therefore, due to these external factors, the Porro prism 6
Since the ultraviolet absorbing material mixed into the glass does not deteriorate, the optical properties are not degraded, and a stable UV cut effect can be always obtained.

In this embodiment, the erecting optical system 3
Part of Porro prism 6 among optical elements constituting A
Is formed by a resin optical element containing an ultraviolet absorbing material. However, the present invention is not limited to this. For example, the entire Porro prism, which is an optical element included in the erecting optical system 3A, may be formed by a similar member. In this case, a more effective ultraviolet light removing effect can be obtained.

In the first and second embodiments described above,
The light refracting member (the meniscus lens 5) or the optical axis changing member (the Porro prism 6) itself is formed by a resin optical element containing an ultraviolet absorbing material, as described in the following third and fourth embodiments. A similar effect can also be obtained by attaching a resin optical element containing an ultraviolet absorbing material to the surface of a light refraction member or an optical axis changing member formed by a normal optical glass lens.

FIG. 3 is a cross-sectional view showing only a part of the optical elements constituting the observation optical system in the binoculars according to the third embodiment of the present invention. As shown in FIG. 3, the optical element 10 is a part of an optical element constituting an observation optical system in the binoculars of the present embodiment, and one of the surfaces intersecting the optical axis of the optical glass lens 10a absorbs ultraviolet light. It is formed by fixing and molding a resin lens 10b containing a material.

In this case, the resin lens 10b is formed by molding a resin material on the surface of the optical glass lens 10a.
Is fixed on the surface of the optical glass lens 10a.

The optical element 10 is, for example, an objective lens optical system 4.4A (FIG. 1) of the observation optical system in the binoculars.
2 and the eyepiece optical system 2.2A (see FIGS. 1 and 2).
) Can be applied.

According to the binoculars of the present embodiment to which the optical element thus formed is applied, since the resin lens 10b is only fixedly formed on the surface of the optical glass lens 10a, the effect of removing ultraviolet rays in a smaller space is obtained. Can be obtained. Also, the manufacturing process is very simple,
Since less resin material is used, it can be manufactured at lower cost.

Further, by performing production control such that the resin material to be molded is held at a fixed amount and molded and fixed, the optical element 10 having a predetermined UV cut characteristic is always supplied (manufactured) stably. Can be. This means
In the case of a device having a pair of observation optical systems, such as binoculars, it can be an important factor from the viewpoint of product quality control, considering that it is necessary to make the UV cut characteristics of both observation optical systems uniform. Therefore, according to the means of the present embodiment, it is possible to manufacture binoculars having an observation optical system that always maintains a stable UV cut characteristic at a low cost, simply and inexpensively.

The surface shape of the resin lens 10b can be extremely easily formed into a desired shape, as compared with an optical element (lens) formed only of optical glass. For this reason, there is an advantage that the optical performance of the entire binoculars can be easily improved by making the surface shape of the resin lens 10b a configuration of, for example, an aspherical lens.

FIG. 4 is a schematic perspective view showing only a part of the optical elements constituting the observation optical system in the binoculars according to the fourth embodiment of the present invention. As shown in FIG. 4, the optical element 11 is an optical element (a Porro prism) constituting a part of the erecting optical system of the observation optical system of the binoculars.
It is formed by a Porro prism 11a made of optical glass and a resin lens 11b attached to one of the surfaces intersecting the optical axis of the Porro prism 11a. The resin lens 11b is formed of a sheet-like resin optical element having an ultraviolet absorber and having no refractive power.

That is, the optical element 11 is manufactured by a normal manufacturing process, and a resin sheet (resin lens 11b) cut to a predetermined size is adhered to the porro prism 11a using an adhesive or the like. It is formed by a process of simply sticking to a surface.

According to the above-described fourth embodiment, similarly to the above-described third embodiment, it is possible to easily and inexpensively implement the UV cut means in the binoculars.

In each of the above-described embodiments, the binoculars have been described as an example. However, the present invention is not limited to the binoculars but may be applied to general telescopes having an observation optical system having a plurality of optical elements, such as monoculars. Can be done.

[Supplementary Note] According to the above-described embodiment of the present invention, an invention having the following configuration can be obtained. (1) A telescope in which the observation optical system includes a plurality of optical elements, wherein at least a part of the optical elements is provided with an optical resin material containing an ultraviolet absorbing material.

(2) In the telescope described in Appendix 1,
The optical element is one of a light refracting member and an optical axis changing member, and the optical resin material is molded and fixed to one of the light refracting member and the optical axis changing member.

(3) In the telescope described in Appendix 1,
The optical resin material is provided on an optical element that is not exposed outside the telescope.

(4) In the telescope described in Appendix 1,
The optical resin material is a member having no refractive power.

(5) In the telescope described in Appendix 1,
The optical resin material is formed in a sheet shape, and the sheet-shaped optical resin material is attached to the surface of the optical element.

[0045]

As described above, according to the present invention, it is possible to manufacture easily, to surely realize a stable UV cut effect, and to affect the spectral transmittance in the visible light region. Thus, it is possible to provide a telescope capable of observing a target object with a good observation image without causing a problem.

[Brief description of the drawings]

FIG. 1 is a configuration diagram illustrating only a simplified configuration of an observation optical system in binoculars according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram showing only a simplified configuration of an observation optical system in binoculars according to a second embodiment of the present invention.

FIG. 3 is a sectional view showing only a part of optical elements constituting an observation optical system in a binocular according to a third embodiment of the present invention.

FIG. 4 is a schematic perspective view showing only a part of optical elements constituting an observation optical system in a binocular according to a fourth embodiment of the present invention.

[Explanation of symbols]

1.1A binoculars 2.2A eyepiece lens optical system (light refracting member) 3.3A erecting optical system (optical axis changing member) 4.4A objective lens optical system 5 meniscus lens Optical resin material, UV cut means) 6 Porro prism (optical resin material, UV cut means)) 10.11 Optical element (lens) 10a Optical glass lens 10b Resin lens (UV cut means) 11a・ 11b: Porro prism (UV cutting means)

Claims (4)

[Claims] 1. A telescope in which an observation optical system includes a plurality of optical elements, wherein at least a part of the optical elements is formed of an optical resin material containing an ultraviolet absorbing material. 2. The optical element comprises one of a light refracting member or an optical axis changing member and the optical resin material, and the optical resin material is formed on one of the light refracting member or the optical axis changing member. The telescope according to claim 1, wherein the telescope is fixed. 3. The telescope according to claim 1, wherein the optical resin material is provided so as not to be exposed outside the telescope. 4. The telescope according to claim 1, wherein the optical resin material is a member having no refractive power.