Telescope optical system with long exit pupil distance

Abstract

The utility model discloses a telescope optical system with a long exit pupil distance, which is characterized in that a first objective lens, a second objective lens, a focusing lens, a semi-pentaprism, a roof prism, a first eyepiece lens, a second eyepiece lens, a third eyepiece lens and a fourth eyepiece lens are sequentially arranged from an object side to an image side along the direction of an optical axis, the first objective lens is a biconvex lens, the second objective lens is a biconcave lens, the first objective lens and the second objective lens form a balsaming lens, the focusing lens is a concave-convex lens, the convex surface faces the object side, the first ocular lens is a biconcave lens, the second ocular lens is a biconvex lens, and the focusing lens is a concave-convex lens. The first eyepiece lens and the second eyepiece lens form a balsaming lens, the third eyepiece lens is a biconvex lens, the fourth eyepiece lens is a concave-convex lens, and the convex surface faces the object side.

Description

TECHNICAL FIELD

[0001] The utility model relates to telescope manufacturing technical field, concretely is a telescope optical system with long exit pupil distance. BACKGROUND

[0002] Telescope is the equipment for observing distant article, telescope can change visual difference, when the human eye observes distant object, feels that the object is pulled close, thereby can see the detail more clearly, this is not the physical pull close actually, but through the imaging of optical system, makes the visual angle of distant object expand, reaches the effect of pull close, telescope can enlarge the angular distance of distant object, makes the human eye can see the detail of smaller angular distance, this characteristic makes telescope have important role when observing remote celestial body, scene or carrying out precision measurement.

[0003] At present, the exit pupil distance after telescope imaging is not long, cannot satisfy the need of use. CONTENT OF THE UTILITY MODEL

[0004] The utility model discloses a telescope optical system with long exit pupil distance to solve the problem in the background art.

[0005] In order to solve the above technical problem, the utility model provides the following technical scheme: a telescope optical system with long exit pupil distance, characterized by: the first lens of objective lens, the second lens of objective lens, focusing mirror, half pentagonal mirror, ridge prism, the first lens of ocular lens, the second lens of ocular lens, the third lens of ocular lens, the fourth lens of ocular lens are sequentially arranged from the object side to the image side along the optical axis direction.

[0006] The first lens of objective lens is double convex lens, the second lens of objective lens is double concave lens, the first lens of objective lens and the second lens of objective lens constitute cemented lens, focusing mirror is concave-convex lens, and the convex surface faces the object side, the first lens of ocular lens is double concave lens, the second lens of ocular lens is double convex lens, the first lens of ocular lens and the second lens of ocular lens constitute cemented lens, the third lens of ocular lens is double convex lens, and the fourth lens of ocular lens is concave-convex lens, and the convex surface faces the object side.

[0007] As preferred technical scheme, the center thickness of the first lens of objective lens is 8.3mm along the optical axis direction, the center thickness of the second lens of objective lens is 3.6mm, the center thickness of focusing mirror is 2mm, the center thickness of the first lens of ocular lens is 2.3mm, the center thickness of the second lens of ocular lens is 8mm, the center thickness of the third lens of ocular lens is 5.5mm, and the center thickness of the fourth lens of ocular lens is 5mm.

[0008] As preferred technical scheme, the object side of the first lens of objective lens is coated with magnesium fluoride film, and the image side of the second lens of objective lens is coated with magnesium fluoride film.

[0009] Compared with the prior art, the utility model has the beneficial effects that

[0010] The optical system of the application has a magnification of 10 times, an exit pupil distance of 16.8 mm, an exit pupil diameter of 4 mm, and a field of view of 4.6 degrees. BRIEF DESCRIPTION OF DRAWINGS

[0011] The accompanying drawings are used to provide a further understanding of the utility model, and constitute a part of the specification, and are used to explain the utility model together with embodiments of the utility model, and do not constitute the limitation to the utility model. In the drawings:

[0012] Figure 1 It is the optical system schematic view of the utility model. DETAILED DESCRIPTION

[0013] The technical scheme in the embodiments of the utility model will be clearly and completely described below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only a part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative work belong to the range of protection of the utility model.

[0014] As Figure 1 The utility model provides the following technical scheme: a telescope optical system with long exit pupil distance, characterized in that: along the optical axis direction from the object side to the image side, the first lens 1 of the objective, the second lens 2 of the objective, the focusing mirror 3, the half five prism 4, the ridge prism 5, the first lens 6 of the ocular, the second lens 7 of the ocular, the third lens 8 of the ocular, the fourth lens 9 of the ocular are sequentially arranged;

[0015] The first lens 1 of the objective lens is a double convex lens, the second lens 2 of the objective lens is a double concave lens, the first lens 1 and the second lens 2 of the objective lens form a cemented lens, the focusing lens 3 is a concave-convex lens, the convex surface faces the object side, the first lens 6 of the ocular lens is a double concave lens, the second lens 7 of the ocular lens is a double convex lens, the first lens 6 and the second lens 7 of the ocular lens form a cemented lens, the third lens 8 of the ocular lens is a double convex lens, the fourth lens 9 of the ocular lens is a concave-convex lens, the convex surface faces the object side, the center thickness of the first lens 1 of the objective lens along the optical axis direction is 8.3mm, the center thickness of the second lens 2 of the objective lens is 3.6mm, the center thickness of the focusing lens 3 is 2mm, the center thickness of the first lens 6 of the ocular lens is 2.3mm, the center thickness of the second lens 7 of the ocular lens is 8mm, the center thickness of the third lens 8 of the ocular lens is 5.5mm, the center thickness of the fourth lens 9 of the ocular lens is 5mm, the object side of the first lens 1 of the objective lens is coated with a magnesium fluoride film, the image side of the second lens 2 of the objective lens is coated with a magnesium fluoride film, the objective lens part of the utility model adopts a cemented lens, so that the light quantity can be effectively improved, the profile diameter of the objective lens group is designed as 57mm, the light quantity is large, and the structure design of the prism group adopts a relatively stable half five-prism 4 and a ridge prism 5, so that the prism position does not need to be redesigned when the structure is designed, the cost of the mold is also simplified, the general injection mold can be used for production, the distance between the ocular lens groups is designed as 0.5mm, so that the ocular lens groups can be closely arranged, the compression ring and the spacer ring can also be universal, after the whole system design is completed, the magnification of the optical system is 10 times, the exit pupil distance is 16.8mm, the exit pupil diameter is 4mm, the field of view is 4.6 degrees, and the whole structure design is simple and reasonable.

[0016] It is apparent for those skilled in the art that the utility model is not limited to the details of the above exemplary embodiments, and the utility model can be realized in other specific forms without departing from the spirit or essential characteristics of the utility model. Therefore, the embodiments should be regarded as exemplary and non-restrictive in any aspect, the scope of the utility model is defined by the appended claims instead of the above description, and all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the utility model. Any figure reference in the claims should not be regarded as limiting the involved claims.

Claims

1. A telescope optical system having an extended eye relief, characterized by: Object lens first lens (1), object lens second lens (2), focusing mirror (3), half five prism (4), ridge prism (5), eyepiece first lens (6), eyepiece second lens (7), eyepiece third lens (8), eyepiece fourth lens (9) are sequentially arranged from object side to image side along the optical axis direction; Object lens first lens (1) is a double convex lens, object lens second lens (2) is a double concave lens, object lens first lens (1) and object lens second lens (2) constitute a cemented lens, focusing mirror (3) is a concave-convex lens, the convex surface faces the object side, eyepiece first lens (6) is a double concave lens, eyepiece second lens (7) is a double convex lens, eyepiece first lens (6) and eyepiece second lens (7) constitute a cemented lens, eyepiece third lens (8) is a double convex lens, eyepiece fourth lens (9) is a concave-convex lens, the convex surface faces the object side.

2. A telescope optical system with long back focal length according to claim 1, characterized in that: The center thickness of object lens first lens (1) is 8.3mm along the optical axis direction, the center thickness of object lens second lens (2) is 3.6mm, the center thickness of focusing mirror (3) is 2mm, the center thickness of eyepiece first lens (6) is 2.3mm, the center thickness of eyepiece second lens (7) is 8mm, the center thickness of eyepiece third lens (8) is 5.5mm, and the center thickness of eyepiece fourth lens (9) is 5mm.

3. A telescope optical system having a long eye relief according to claim 1, characterized in that: The object side of object lens first lens (1) is coated with magnesium fluoride film, and the image side of object lens second lens (2) is coated with magnesium fluoride film.

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