JP2007132973A - Observation device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact observation device capable of observing a distant object and video on a display device, simultaneously or by switching them. <P>SOLUTION: When video on the display device 5, such as an LCD is observed, a mirror 2 is inserted in an optical path. The image on the display device 5 is formed as an intermediate image 4 at the same position as when the observation device is used as a telescope by an image-formation lens system, comprising a first lens 6 having positive optical power and a second lens 8 having negative optical power, and is enlarged and observed through an eyepiece 3. Since the second lens 8 having the negative optical power is provided, the intermediate image 4 is formed at the same position as when it is used as the telescope, even if the distance between the image-formation optical system and the display device 5 is shortened. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an observation apparatus.

  In telescopes and binoculars, there is a need for magnifying and observing distant objects and observing and enjoying images unrelated to the outside scene. As an example of responding to such a request, Japanese Patent Application Laid-Open No. 9-96765 (Patent Document 1) forms an image by switching light from the outside and light from a display device such as an LCD, and observes through an eyepiece. An apparatus is disclosed.

  The principle is shown in FIG. When used as a telescope, the mirror 22 as the optical path switching means is not inserted in the optical path. Therefore, an object image is formed as an intermediate image 24 by the objective lens 21 and magnified and observed by the eyepiece lens 23. When observing an image on the display device 25 such as an LCD, the mirror 22 is inserted into the optical path. Then, the image of the display device 25 is similarly formed as an intermediate image 24 by the imaging lens 26 at the same position as when used as a telescope, and is magnified and observed by the eyepiece lens 23. An erecting prism 27 is provided so that an image observed when used as a telescope is erect.

JP-A-9-96765

  However, the optical system described in Patent Document 1 has a problem in that the distance between the imaging lens 26 and the display device 25 becomes large, and the device becomes large. Since Patent Document 1 is based on the premise of fixed observation binoculars, it does not cause any problems. However, in portable telescopes and binoculars, the apparatus becomes too large, and such an optical system is actually used. There is a problem that it is impossible to do.

  The present invention has been made in view of such circumstances, and it is an object of the present invention to provide a small observation device that can observe a distant object and an image of a display device simultaneously or by switching. To do.

  A first means for solving the above problem is an observation device for observing an intermediate image of an object formed by an objective lens with an eyepiece, and switches an optical path disposed between the objective lens and the intermediate image. An optical path splitting unit, a display unit, and an imaging optical system are provided. The imaging optical system forms an image of the display unit at the position of the intermediate image of the object, and both the intermediate image of the object and the image of the display unit are simultaneously formed. Alternatively, the image forming optical system may be switched to be observed with an eyepiece, and the imaging optical system includes a first lens having a positive optical power and a second lens having a negative optical power. An observation apparatus comprising a lens and having an air space between the first lens and the second lens.

  In this means, the imaging optical system is constituted by a first lens having a positive optical power and a second lens having a negative optical power, and between the first lens and the second lens. The distance between the display means and the imaging optical system can be shortened by the action of the second lens having a negative optical power, so that the observation apparatus can be reduced in size. can do.

  The second means for solving the problem is the first means, wherein the display means is focused by moving all or part of the imaging optical system. Is.

  In this means, the display means can be focused by moving all or part of the imaging optical system, so that a clear image can be observed.

  According to this means, it is possible to provide a small observation apparatus that can observe a distant object and an image of a display device simultaneously or by switching.

  Hereinafter, an example of an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a principle diagram showing an outline of an optical system according to an embodiment of the present invention. When used as a telescope, the mirror 2 as the optical path switching means is not inserted in the optical path connecting the objective lens 1 and the eyepiece lens 3. Therefore, an object image is formed as an intermediate image 4 by the objective lens 1 and magnified and observed by the eyepiece 3. An erecting prism 7 is provided so that an image observed when used as a telescope is erect. This configuration is almost the same as that described in Patent Document 1.

  When an image on the display device 5 such as an LCD is observed, the mirror 2 is inserted into an optical path connecting the objective lens 1 and the eyepiece lens 3 (hereinafter referred to as “optical path of the observation optical system”). The image of the display device 5 is also used as a telescope as an intermediate image 4 by an imaging optical system including a first lens 6 having a positive optical power and a second lens 8 having a negative optical power. The image is formed at the same position as when the image is taken, and is enlarged and observed by the eyepiece 3. In FIG. 1, in order to further reduce the size of the apparatus, the optical path is bent using two mirrors M, and this optical path and the optical path of the observation optical system are made parallel to each other. The optical path length of the imaging optical system is increased without increasing the size of the device in the optical axis direction. In this embodiment, since the second lens 8 having negative optical power is provided, even if the distance between the imaging optical system and the display device 5 is shortened, the intermediate image 4 is used as a telescope. It can be formed at the same position as the position to be used.

  In this embodiment, as shown in FIG. 1, the position of the second lens 8 is variable. Accordingly, the display device 5 can be focused without moving the display device 5 with the code. Needless to say, in order to perform focusing, the position of the first lens 6 may be variable, and the first lens 6 and the second lens 8 may be moved simultaneously. Since the display device 5 with the code is not moved, the reliability of the device can be improved.

  In the above description, the mirror 2 is used as the optical path switching means. However, if a half mirror is used instead of the mirror 2, when the half mirror is inserted into the optical path of the observation optical system, an image of the outside world is used. And an image of the display device can be superimposed and observed. Further, the half mirror may be fixedly installed on the optical path of the observation optical system.

  FIG. 2 is a diagram showing the optical system according to the embodiment of the present invention in more detail, and the configuration and operation thereof are the same as those shown in FIG. As the objective lens 1, two bonded lenses are used to function as a convex lens. When the mirror is at the position 2a, the mirror 2a is out of the optical path of the observation optical system, and the light transmitted through the objective lens 1 is an upright composed of a Porro prism composed of two right-angle total reflection prisms 9a and 9b. The light enters the prism and forms an upright image as the intermediate image 4. This image is magnified and observed by an eyepiece lens 3 which is composed of two cemented lenses and one convex lens and functions as a convex lens. The outline of the Porro prism is shown in FIG. The Porro prism shown in FIG. 2 corresponds to the configuration when FIG. 3 is viewed from above on the paper surface, and can be reversed up and down and left and right by combining two right-angle total reflection prisms 9a and 9b.

  When the mirror is at the position 2b, the mirror 2b is inserted in the optical path of the observation optical system, and the light from the display device 5 enters the erecting prism to form the intermediate image 4. This image is magnified and observed with the eyepiece 3. The first lens is composed of two cemented lenses and one convex lens, and a lens group that functions as a convex lens is used. The second lens is composed of two cemented lenses and functions as a concave lens. A lens group is used.

  As described above, the term “lens” in the present specification and claims is not necessarily a single lens, and a plurality of lenses are used as a bonded lens or a lens group, and one lens is used for optical design. Including what is considered as a lens. In the above description, the telescope has been described as an example, but it goes without saying that the present invention includes binoculars. When applied to binoculars, it is preferable to provide a pair of left and right optical systems in FIG. In this case, the number of the display devices 5 may be one, for example, the optical path may be branched into two in the middle of the imaging optical system, and the image of the display device 5 may be guided to the left and right eyepieces.

It is a principle figure which shows the outline | summary of the optical system of embodiment of this invention. It is the figure which showed the optical system of embodiment of this invention in detail. It is a figure which shows the outline | summary of a Porro prism. It is a figure which shows the outline | summary of the optical system of the conventional apparatus which switches the light ray from the external field, and the light ray from display apparatuses, such as LCD, it forms an image, and observes through an eyepiece.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Objective lens, 2 ... Mirror, 3 ... Eyepiece lens, 4 ... Intermediate image, 5 ... Display apparatus, 6 ... 1st lens, 7 ... Erecting prism, 8 ... 2nd lens, 9a ... Right angle total reflection prism 9b ... right angle total reflection prism

Claims (2)

An observation apparatus for observing an intermediate image of an object formed by an objective lens with an eyepiece lens, comprising an optical path switching or optical path dividing means arranged between the objective lens and the intermediate image, a display means and an imaging optical system. The image forming optical system forms an image of the display means at the position of the intermediate image of the object, and both the intermediate image of the object and the image of the display means can be observed simultaneously or by switching with an eyepiece. In the observation apparatus, the imaging optical system includes a first lens having a positive optical power and a second lens having a negative optical power, and the first lens and the second lens have a second optical power. An observation apparatus having an air space between the lens and the lens. The observation apparatus according to claim 1, wherein the display unit is focused by moving all or part of the imaging optical system.

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