JPS59136714A - Reflecting telescope - Google Patents

Abstract

PURPOSE:To obtain an excellent image by arranging a convex lens which extends the image-formation position of a light beam from an oblique mirror on the optical path between the slanting mirror and an eyepiece, and providing a reflecting body at right angles between the concave lens and eyepiece. CONSTITUTION:The concave lens 20 is arranged on the optical path extending from the oblique mirror in a lens barrel 6 and a right-angled prism 21 as a reflector is provided between the concave lens 20 and eyepiece 12. Namely, the right-angled prism 21 is provided in the intersection part 25 of a casing 24 having a couple of tubes 22 and 23 in a right-angled intersection shape; and the concave lens 20 is provided in one tube and those members 20 and 21 are made into an attachment. On tube is inserted into the tip part 11 of a draw tube 10 to position the concave lens 20 in the tip part 11, and the eyepiece 12 is inserted fixedly into the other tube 23, attaching the concave lens 20 and right-angled prism 21 without touching the draw tube 10 nor the eyepiece 12.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a reflecting telescope, and more particularly to a reflecting telescope that uses an oblique mirror to guide light rays to an eyepiece.

Examples of conventional reflecting telescopes include those shown in FIGS. 1 to 4, for example. In the figure, reference numeral 1 denotes a Newtonian reflecting telescope, which is balancedly supported on a tripod 2 via a parallax 3, and is further equipped with a guiding scope 4, a finder 5, and the like. Further, the reflecting telescope 1 includes a primary mirror 7 and an oblique mirror 8 in a lens barrel 6.

The light rays introduced into the lens barrel 6 through the opening 9 of the lens barrel 6 are reflected and converged by the primary mirror 7, and the light rays reflected and converged by the primary mirror 7 are further reflected laterally by the oblique mirror 8. ing. A draw tube 10 and the draw tube 1 are provided so that the light beam reflected by the oblique mirror 8 can be moved forward and backward toward the side of the lens barrel 6.
0 through the eyepiece 12 provided at the tip 11 of the
It is possible to actually see or take photographs at the side of the lens barrel 6, making it convenient for observation. Then, the light beam from the oblique mirror 8 is formed into an image within the draw tube 10, and after passing through this image formation position X, it is converted into a parallel light beam by the eyepiece 12.

Also.

After passing through the eyepiece 12, an inverted image is obtained.

However, in such a conventional reflecting telescope, the length of the draw tube 10 is limited.

The draw tube 10 itself is limited by the constraint of interference with the oblique mirror 8 due to movement back and forth into the lens barrel 6, and as a result, the focal position F of the primary mirror 7, and in history the imaging position X, is also limited by the draw tube 1.
0 length'''!, a reflector such as a prism or a reflector is interposed between the draw tube 10 and the eyepiece 12 to guide the light rays from the oblique mirror 8 to the other side. For this reason, for example, a solar image is transferred using a solar projection plate 9 on an axis that intersects with the axial direction of the draw tube 10, or an inverted image is corrected. It cannot be converted into a statue.

There are restrictions on how to install attachments.

There was a problem that it was difficult to convert it to various uses by attaching an attachment, and its versatility was also low. However, if you dare to transfer a sun image, please use the draw tube 10.
It is also possible to place a blank sheet of paper facing the eyepiece 12 on the extension line in the axial direction and project the solar image onto this blank sheet of paper, but this is inconvenient because it is difficult to see the sheet and it is also difficult to transfer the solar image. There was a problem.

This invention was made by focusing on these conventional problems, and it is possible to mount an attachment with a simple structure without making any special modifications to the draw tube or eyepiece, and it provides versatility and versatility. Specifically, in the first invention, a concave lens is disposed on the optical path from the oblique mirror to the eyepiece, and the concave lens extends the imaging position of the light ray from the oblique mirror. By placing a reflector in the perpendicular direction between the draw tube and the eyepiece, and by providing a solar projection plate that receives the projected light from the eyepiece in the direction perpendicular to the draw tube, it is possible to obtain a solar image using the sun projection plate. Easy transcription1. Further, in the second invention, a concave lens for extending the imaging position of the light beam from the oblique mirror is disposed on the optical path from the oblique mirror to the eyepiece, and a plurality of concave lenses for inverting an inverted image to an erect image are provided between the concave lens and the eyepiece. By arranging a reflector with a reflective surface, it is possible to easily obtain an erect image, making it possible to use it not only as an astronomical telescope but also as a terrestrial telescope.

The present invention will be explained below based on the drawings.

Similarly, in the following description, parts common to those of the prior art are given the same reference numerals, and redundant explanations will be omitted.

FIG. 5 and FIG. 6 are diagrams showing an embodiment of the first invention. That is, a concave lens 20 is disposed on the optical path from the oblique mirror 8 in the lens barrel 6 to the eyepiece 12, and a right-angle prism 21 as a reflector is disposed between the concave lens 20 and the eyepiece 12.

Specifically, a pair of tubes 22, 23 crossed at right angles
The right angle prism 21 is provided in the intersection 25 of the casing 24, and the concave lens 20 is provided in one tube 22, so that the concave lens 20 and the right angle prism 2
1 into an attachment, and insert one of the tubes 22 into the distal end 11 of the draw tube 10 to attach the distal end 1.
The concave lens 20 and the right angle prism 21 are positioned in the draw tube 10 and the eyepiece 12 without any special modification.
This allows for the installation of Further, the concave lens 20 is inserted into the distal end 11 of the draw tube 10 and is positioned in front of the focal point F of the primary mirror 7, so that the imaging position It is designed to extend to a certain position. As for the concave lens 20, an achromatic lens which is a combination of two lenses is used.

Therefore, after the light beam from the oblique mirror 8 passes through the concave lens 20, it is reflected in the right angle direction by the right angle prism 21 without forming an image, and then passes through the eyepiece 12 after forming an image, and then passes through the draw tube 10. This means that a good image can be projected in a direction perpendicular to the axial direction. Then, the solar projection plate 27 is attached to the draw tube 10 via the mount bracket 26, and the solar projection plate 27 is positioned so as to correspond to the eyepiece 12 in the orthogonal cross direction of the draw tube 10. It is designed to receive projected light from the eyepiece 12 and others. Therefore, the projected image can be easily recognized visually, and the transfer can be easily performed in a comfortable posture. Furthermore, the magnification increases by the length of the imaging position F, which improves the image quality.

FIG. 7 and FIG. 8 show an embodiment of the second invention. That is, a concave lens 20 is disposed on the optical path from the oblique mirror 8 in the lens barrel 6 to the eyepiece 12, and the concave lens 20 and the eyepiece 1
An erecting prism 41 as a reflector having a plurality of reflective surfaces 40 for inverting an inverted image into an erect image is disposed between the two. Specifically, a pair of parallel tubes 4 that wept 9 times.
2.43, the erecting prism 41 is installed in the middle part 45 of the casing 449, and the concave lens 20 is installed in one tube 42, and the concave lens 20 and the royal prism 41 are made into attachments. The draw tube 10 and the eyepiece 12 are inserted into the distal end 11 of the draw tube 10 to position the concave lens 20 within the distal end 11, and the eyepiece 12 is inserted and fixed into the other tube 43.
It is possible to attach the concave lens 20 and the royal prism 41 without special modification. Further, the concave lens 20 is inserted into the distal end 11 of the draw tube 10 and is positioned in front of the focal point F of the primary mirror I, so that the imaging position X2 of the light beam from the oblique mirror 8 is moved to a position corresponding to the eyepiece 12. It is designed to extend to. Similarly, the concave lens 20 is an achromatic lens that is a combination of two lenses. Therefore, after the light beam from the oblique mirror 8 passes through the concave lens 20, it is reflected by the erecting prism 41 without forming an image, and then it forms an image and passes through the eyepiece 12, resulting in a good erect image. This makes it possible to use it not only as an astronomical telescope but also as a ground-based telescope.

Also.

This is similar to the first invention in that the magnification is also increased.

As explained above, according to the present invention.

In the first invention, a concave lens is disposed on the optical path from the oblique mirror to the eyepiece to extend the imaging position of the light beam from the oblique mirror, and a reflector in a right angle direction is disposed between the concave lens and the eyepiece. , a solar projection plate is provided in the direction perpendicular to the draw tube to receive the projected light from the eyepiece,
In the second invention, a concave lens is arranged in the optical path from the oblique mirror to the eyepiece to extend the imaging position of the light beam from the oblique mirror, and an inverted image is inverted to an erect image between the concave lens and the eyepiece. This is because the structure includes a reflector with a reflective surface.

Due to the presence of the concave lens that extends the imaging position of the light beam from the oblique mirror, the imaging position can be reliably extended even though the length of the draw tube is limited, and as a result, the distance between the draw tube and the eyepiece is It is possible to reliably obtain a good image even if a reflector is placed between the lenses, and the attachment can be mounted with a simple structure without having to use special force on the draw tube or eyepiece, making it versatile. This has the effect of increasing flexibility and versatility. Also, the first
In the case of the invention, it is possible to use the solar projection plate at the optimum position for use, and in the case of the second invention, it is possible to easily obtain an erect image, and it has the effect that it can be used not only as an astronomical telescope but also as a terrestrial telescope. . Furthermore, the use of the concave lens extends the imaging position and has the effect of increasing the magnification of the telescope.

[Brief explanation of the drawing]

Figure 1 is an external perspective view of a conventional reflecting telescope. FIG. 2 is a schematic sectional view showing the internal structure of the reflecting telescope shown in FIG. FIG. 3 is a partial perspective view enlarging the area indicated by the arrow ``■'' in FIG. FIG. 4 is an enlarged sectional view taken along line W-W in FIG. 6. FIG. 5 is a perspective view corresponding to Makoto 3, showing an embodiment of the first invention. FIG. 6 is an enlarged sectional view taken along the line V[-111 of FIG. FIG. 7 is a perspective view corresponding to FIG. 6 showing an embodiment of the second invention. FIG. 8 is an enlarged sectional view taken along the line ■--■ in FIG. 7. 1... Reflecting telescope 6... Lens tube 7... Primary mirror 8... Oblique mirror 10... Draw tube 12... Eyepiece X, X,, X2... Imaging position 20...・ Concave lens 21 ... Right angle prism 2 as a reflector
7... Solar projection plate 40... Reflective surface

Claims (2)

[Claims] (1) In a reflecting telescope that has a primary mirror and an oblique mirror in its lens barrel, and takes out the light beam reflected by the oblique mirror via a draw tube and an eyepiece. A concave lens is disposed on the optical path from the oblique mirror to the eyepiece to extend the imaging position of the light ray from the oblique mirror, and a reflector is disposed between the concave lens and the eyepiece in the right angle direction, and the draw tubes are crossed at right angles. A reflecting telescope characterized by being provided with a solar projection plate that receives projected light from an eyepiece in a direction. (2) In a reflecting telescope that has a primary mirror and an oblique mirror in its lens barrel, and takes out the light beam reflected by the oblique mirror via a draw tube and an eyepiece. A concave lens is disposed on the optical path from the oblique mirror to the eyepiece to extend the imaging position of the light beam from the oblique mirror, and a plurality of reflective surfaces are provided between the concave lens and the eyepiece to invert an inverted image into an erect image. A reflecting telescope characterized by its body.