Day-and-night optical sight

Abstract

The present invention relates to a day-and-night optical sight. The day-and-night optical sight according to the present invention comprises: a housing; an eyepiece lens disposed at one end portion of the housing; an objective lens disposed at the other end portion of the housing; an imaging-display unit including, in a region between the eyepiece lens and the objective lens, an imaging element disposed toward the objective lens and a display element disposed toward the eyepiece lens; a mode switching unit capable of separating the imaging-display unit from a main optical axis between the eyepiece lens and the objective lens in order to select a daytime mode, or putting the imaging-display unit on the main optical axis in order to select a nighttime mode; and an error compensation unit capable of compensating for an optical error due to the thickness of the imaging-display unit between the daytime mode and the nighttime mode. Therefore, provided is the day-and-night optical sight which can select the daytime mode or the nighttime mode according to a use environment, and which compensates for the optical error occurring between the daytime mode and the nighttime mode so as to use the objective lens and the eyepiece lens both day-and-night.

Description

Day / night optical sight

[0001] The present invention relates to a day / night optical sight, and more specifically, to a day / night optical sight that can select a day mode or a night mode depending on the usage environment, and can compensate for optical errors occurring between the day mode and the night mode to enable the objective lens and eyepiece to be used for both day and night.

[0002] Typically, rifles and machine guns are aimed at a target by aligning the sights using the sights and rear sights. However, this aiming method has the problem that it is difficult to align the sights even with small vibrations or shaking, and it is disadvantageous for rapid aiming at close range or in urgent situations.

[0003] To solve the hassle of aligning the crosshairs and to increase accuracy, optical scopes were proposed for daytime use.

[0004] Optical scopes are characterized by their excellent target identification ability because they can magnify and view the target using an optical system with magnification consisting of an objective lens and an eyepiece lens.

[0005] Additionally, a reticle part is used between the objective lens and the eyepiece to increase the precision of aiming.

[0006] In addition, when the objective lens of an optical scope has a positive refractive power, an erecting optical part is required to re-invert the image of an external object in the inverted objective lens. The optical configuration of this erecting optical part is largely divided into a prism type and a relay lens type.

[0007] Figure 1 is a structural diagram of an optical scope having a prism-type erecting optical part, and Figure 2 is a structural diagram of an optical scope having a relay lens-type erecting optical part.

[0008] First, referring to Fig. 1, a daytime optical scope (10) having a prism-type upright optical section is composed of an objective lens (11), a prism optical system (12), a reticle (13), and an eyepiece lens (14). In Fig. 1, the objective lens (11) and the eyepiece lens (14) are each composed of one lens, but in practice, they are composed of multiple lenses to remove aberrations, etc.

[0009] The principle of the scope is to focus an image of an external object by the objective lens (11) on the reticle (13), and to simultaneously magnify and view both the image of the external object and the reticle (13) by the eyepiece (14). At this time, if the image of the objective lens (11) is focused directly on the reticle (13), the image appears upside down. Therefore, the prism optical system (12), which is an upright optical unit that changes an inverted image into an upright image between the objective lens (11) and the reticle (13) so that the image seen through the eyepiece (14) can be upright by making it appear upside down again.

[0010] Next, referring to Fig. 2, we can see the structure of a daytime optical scope that adopts a relay lens method, which is another method of an erecting optical section that plays a role in changing an inverted image into an erected image. This daytime optical scope is composed of an objective lens (11), a reticle (located at position A or position B), a relay lens (12'), an eyepiece lens (14), etc. In Fig. 2, the objective lens (11) is composed of a single lens, but in reality, it is composed of multiple lenses to remove aberrations, etc.

[0011] In addition, the above relay lens (12') is composed of two or more lens groups to form a zoom optical system, and in some cases, multiple lenses are used.

[0012] When the image of an external object by the objective lens (11) is focused on the reticle at position A, this becomes the first object (1st object) of the relay lens (12'). At the same time, the relay lens (12') re-focuses the reticle target of the reticle at the same position as the first object at position B in front of the eyepiece lens (14) to create the first image, which acts as the second object (2nd object) of the eyepiece lens (14). At this time, the relay lens (12') inverts the image while focusing the first object (1st object) as the first image (1st image = 2nd object). That is, when an external object is focused by the objective lens (11), it becomes an inverted image (1st object), and the relay lens (12') re-focuses this as the 2nd object, inverting the image again. Eventually, an external object is erected in front of the eyepiece (14) and re-imaged as a second object. This second object becomes the object of the eyepiece (14), and the observer eventually observes the external object as a virtual image magnified by the eyepiece (14). This is the optical principle by which the image of an external object seen by an observer in a scope that adopts a relay lens (12') appears as an erect image.

[0013] Meanwhile, since the optical scope described above can only observe the target when the surrounding environment is bright, there is a growing demand these days for a sight that can observe the target using infrared wavelength light emitted from the target in dark, low-light environments such as evening or night when the target cannot be observed by visible light.

[0014] However, thermal imaging sights have been used as sights capable of recognizing external objects in low light conditions up to now. The thermal imaging sight may be composed of an infrared imaging objective lens that forms an infrared image, an infrared detection element that detects infrared, a display unit that provides the thermal image signal detected by the infrared detection element as an image for the user to view, and an eyepiece that enlarges and displays the image output from the display unit.

[0015] However, if a user carries an optical scope for daytime use and a thermal imaging sight for nighttime use, respectively, and chooses one of them according to the surrounding situation, mounts it on a gun, and then aims at a target, not only is a quick response impossible, but the user also has to carry more equipment, which causes inconvenience in movement.

[0016] In addition, when attaching an optical scope and a thermal imaging sight to a firearm separately, the volume and weight of the firearm increase, reducing portability. In addition, when aiming at a target using sights attached to different locations depending on the surrounding circumstances, there is a problem in that it is difficult to respond quickly.

[0017] Accordingly, the purpose of the present invention is to solve such conventional problems, and to provide a day / night dual-purpose optical sight that can select a day mode or a night mode depending on the usage environment, and can compensate for optical errors occurring between the day mode and the night mode, thereby enabling the objective lens and eyepiece to be used for both day and night.

[0018] In addition, it provides a day / night dual-purpose optical sight that is easy to use and allows for quick mode switching by compensating for optical errors while switching modes according to the usage environment.

[0019] In addition, the present invention provides a day / night dual-purpose optical sight that can further expand the scope of use by arranging two or more types of imaging-display units with different usage environments for image acquisition.

[0020] The above object is achieved, according to the present invention, by a day / night dual-purpose optical sight comprising: a housing; an eyepiece disposed at one end of the housing; an objective lens disposed at the other end of the housing; an image pickup-display unit including an image pickup element disposed toward the objective lens in a region between the eyepiece and the objective lens and a display element disposed toward the eyepiece; a mode switching unit capable of moving the image pickup-display unit away from the main optical axis between the eyepiece and the objective lens for selecting a day mode or bringing the image pickup-display unit onto the main optical axis for selecting a night mode; and an error compensation unit capable of compensating for an optical error due to a thickness of the image pickup-display unit between the day mode and the night mode.

[0021] Here, it is preferable that the error compensation unit include a light-transmitting optical element capable of compensating for an optical distance (OPL: optical path length) of the main optical axis between the eyepiece lens and the objective lens in response to an error due to the thickness of the imaging-display unit between the day mode and the night mode while maintaining a constant distance between the eyepiece lens and the objective lens.

[0022] In addition, it is preferable that the physical length (L) through which light passes through the error compensation unit is set to satisfy mathematical expression 1 when the thickness of the imaging-display unit is L1 and the refractive index of the error compensation unit is n.

[0023] -- (Equation 1)

[0024] In addition, it is preferable that the error compensation unit be arranged so as to be movable in a direction intersecting the main optical axis within the housing so as to be able to enter or exit the main optical axis between the eyepiece lens and the objective lens.

[0025] In addition, it is preferable that the mode switching unit includes a transfer block that supports the image-capturing-display unit and the error compensation unit, and an operating unit that adjusts the position of the transfer block so that either the error compensation unit or the image-capturing-display unit is positioned on the main optical axis.

[0026] In addition, it is preferable that the mode switching unit further include a guide that guides the movement of the transfer block.

[0027] In addition, it is preferable that the operating unit includes a rotary knob rotatably supported on the housing and a rotary arm extending radially from the center of rotation of the rotary knob, and a guide groove is formed on a surface of the transfer block facing the rotary arm, which extends in one direction and on which the other end of the rotary arm is slidably supported.

[0028] In addition, it is preferable that the error compensation unit be configured to move the eyepiece lens in the direction of the primary optical axis in order to compensate for an optical error due to the thickness of the imaging-display unit.

[0029] In addition, it is preferable that the error compensation unit includes a moving member that guides movement of the eyepiece in the direction of the primary optical axis on the housing, a first stopper that guides the movement position of the eyepiece for day mode operation on the housing, and a second stopper that guides the movement position of the eyepiece for night mode operation.

[0030] In addition, it is preferable that the movement distance of the eyepiece lens by the error compensation unit is set to correspond to the gap between the imaging surface of the imaging element and the display surface of the display element.

[0031] In addition, it is preferable that the image-capturing-display unit includes a first image-capturing-display unit for a first night mode capable of acquiring an image in a first environment and a second image-capturing-display unit for a second night mode capable of acquiring an image in a second environment different from the first image-capturing-display unit.

[0032] In addition, it is preferable that the distance between the eyepiece and the objective lens is set based on the first night mode in which the first image-capturing-display unit is arranged between the eyepiece and the objective lens, and the error compensation unit includes a third error compensation unit capable of compensating for the optical distance of the main optical axis in response to an error due to the thickness of the first image-capturing-display unit when the day mode is selected, and a fourth error compensation unit capable of compensating for the optical distance of the main optical axis in response to an error due to a difference in the thickness of the first image-capturing-display unit and the second image-capturing-display unit when the second night mode is selected.

[0033] In addition, it is preferable that the thicknesses (s1, s4) of the third error compensation unit and the fourth error compensation unit are set to satisfy mathematical expressions 2 and 3, where the thickness of the first imaging-display unit is s2, the thickness of the second imaging-display unit is s3, the refractive index of the third error compensation unit is n1, and the refractive index of the fourth error compensation unit is n2.

[0034] -- (Equation 2)

[0035] -- (Equation 3)

[0036] In addition, it is preferable that the mode switching unit includes a first slot for fixing the third error compensation unit, a second slot for fixing the first imaging-display unit, and a third slot for fixing the second imaging-display unit and the fourth error compensation unit, and that any one of the first slot to the third slot can be positioned on the main optical axis.

[0037] In addition, it is preferable that the mode switching unit be of a revolver type or a sliding type.

[0038] The object of the present invention can also be achieved by a day / night dual-purpose optical sight, which includes a barrel for supporting an objective lens; a first exchange module for a day mode for supporting an eyepiece; a first image capture-display unit capable of acquiring and displaying an image in a low-light environment and a second exchange module for a first night mode for supporting an eyepiece for forming an image displayed in the first image capture-display unit; and a third exchange module for a second night mode for supporting an eyepiece for forming an image displayed in the display unit to a user's eye, the second image capture-display unit including an image capture device capable of acquiring an image in an ultra-low-light environment and a display device capable of displaying an image acquired from the image capture device, and wherein any one of the first to third exchange modules is coupled to the barrel according to a usage environment so as to select any one of the day mode, the first night mode, and the second night mode.

[0039] According to the present invention, a day / night dual-purpose optical sight is provided, which can select a day mode or a night mode depending on the usage environment, and compensate for optical errors occurring between the day mode and the night mode, thereby enabling the objective lens and the eyepiece to be used for both day and night.

[0040] In addition, a day / night dual-purpose optical sight is provided that is easy to use and allows for quick mode switching as it can compensate for optical errors while switching modes according to the usage environment.

[0041] In addition, a day / night dual-purpose optical sight is provided that can further expand the scope of use by arranging two or more types of imaging-display units with different usage environments for image acquisition.

[0042] Figure 1 is a schematic diagram of an optical scope having a prism-type upright optical section.

[0043] Figure 2 is a structural diagram of an optical scope having a relay lens type erecting optical part.

[0044] Figure 3 is a perspective view of a day / night dual-purpose optical sight according to the first embodiment of the present invention;

[0045] Figures 4 and 5 are exploded perspective views of Figure 3;

[0046] Figures 6 and 7 are partial cross-sectional perspective views of Figure 3;

[0047] Figure 8 is a drawing to explain the optical error between day mode and night mode.

[0048] FIG. 9 is a drawing showing the night mode state of a day / night dual-purpose optical sight according to the first embodiment of the present invention;

[0049] FIG. 10 is a drawing showing the day mode state of a day / night dual-purpose optical sight according to the first embodiment of the present invention;

[0050] FIG. 11 is a partially cut-away perspective view showing a second error compensation part of a day / night dual-purpose optical sight according to a second embodiment of the present invention.

[0051] Fig. 12 is a cross-sectional view of a day / night dual-purpose optical sight according to a second embodiment of the present invention.

[0052] Figures 13 and 14 are drawings showing the operating state of the second error compensation unit of the day / night dual-purpose optical sight according to the second embodiment of the present invention.

[0053] Figure 15 is an optical structure diagram for each mode of a day / night dual-purpose optical sight according to the third embodiment of the present invention.

[0054] FIG. 16 is a drawing showing an example of a mode switching unit of a day / night dual-purpose optical sight according to a third embodiment of the present invention.

[0055] Figure 17 is a configuration diagram of a day / night dual-purpose optical sight according to the fourth embodiment of the present invention.

[0056] Before the explanation, in several embodiments, components having the same configuration will be described representatively in the first embodiment using the same symbols, and in other embodiments, components having different configurations from the first embodiment will be described.

[0057] Hereinafter, a day / night dual-purpose optical sight according to a first embodiment of the present invention including one imaging-display unit for night mode selection will be described in detail with reference to the attached drawings.

[0058] Among the attached drawings, FIG. 3 is a perspective view of a day / night dual-purpose optical sight according to the first embodiment of the present invention, FIGS. 4 and 5 are exploded perspective views of FIG. 3, and FIGS. 6 and 7 are partial cross-sectional perspective views of FIG. 3.

[0059] The day / night dual-purpose optical sight according to the first embodiment of the present invention as illustrated in the above drawing includes a housing (110), an eyepiece (122), an objective lens (121), an image capture-display unit (130), a first error compensation unit (140), and a mode switching unit (150).

[0060] The above housing (110) may be formed in a barrel shape with both ends open and a passage formed inside to connect the front and rear ends, and a coupling mechanism for mounting on a firearm may be provided on one side.

[0061] The above eyepiece lens (122) is placed in an opening at the rear end of the housing (110) facing the user, and the objective lens (121) is placed in an opening at the front end of the housing (110) facing the target.

[0062] Meanwhile, an erecting optical unit (123) and a reticle (124) may be placed inside the housing (110), that is, between the eyepiece lens (122) and the objective lens (121), and a zero-point adjustment unit may be provided outside the housing (110) to finely adjust the position of the reticle (124) up, down, left, and right for zero-point adjustment. Since the erecting optical unit (123), the reticle (124), and the zero-point adjustment unit correspond to known technologies generally applied to optical scopes, a detailed description thereof will be omitted.

[0063] The above housing (110) can be configured separately as a first housing (111) that supports the eyepiece lens (122), a second housing (112) that supports the objective lens (121), and a third housing (113) that provides space for movement of the image capture-display unit (130) and the first error compensation unit (140) for switching between the day mode and the night mode between the first housing (111) and the second housing (112), and it is preferable that the first housing (111), the second housing (112), and the third housing (113) are assembled so as to be detachable from each other.

[0064] The third housing (113) includes a receiving space (113b) that can receive the image-display unit (130) and the first error compensation unit (140) in a state where they can move left and right, a body part (113a) having an opening formed to communicate with the receiving space (113b), and a cover part (113c) that closes the opening of the body part (113a).

[0065] The first housing (111) can be detachably coupled to one side of the body portion (113a), and the third housing (113) can be detachably coupled to the other side.

[0066] In addition, a hole is formed on the plate surface of the cover part (113c) to allow the rotary knob (152a) of the operating part (152) to be installed so as to be able to rotate around an axis, and a rotary guide inner part (113d) that can limit the rotation range of the rotary arm (152b) of the operating part (152) is formed on the inner surface.

[0067] The above-mentioned image-display unit (130) includes an image sensor (131) arranged toward the objective lens (121) and a display sensor (132) arranged toward the eyepiece lens (122) on the rear side of the image sensor (131), and is arranged so as to be able to enter or exit the main optical axis (OA) between the eyepiece lens (122) and the objective lens (121) within the third housing (113).

[0068] The above-mentioned imaging element (131) may be formed of a low-light image sensor capable of acquiring images in a dark environment. For example, a low-light image sensor such as a photocathode of a GEN III+ image intensifier tube, which is widely used in night vision goggles, or an ultra-low-light image sensor such as the SIONYX XQE-1350 / 1351 sensor of SIONYX may be selected.

[0069] In addition, the above-mentioned imaging element (131) may be selected as an image sensor capable of detecting visible light and infrared light simultaneously, or an image sensor with various characteristics may be selected for the purpose of providing a forward image to a user in an environment where a forward view cannot be secured with a general daytime optical scope.

[0070] The above display element (132) is for displaying an image captured by the above imaging element (131), and OLED, LCD, LCOS, and micro LED displays can be applied, and in addition, various types of display devices can be applied depending on the usage environment.

[0071] Typically, the GEN III+ image intensifier tube includes a photocathode that forms an external image as a configuration corresponding to the image pickup element (131) and a phosphor screen that displays an image formed by the photocathode as a configuration corresponding to the display element (132). Therefore, when the image pickup-display unit (130) is selected as the GEN III+ image intensifier tube, the thickness (L1) of the image pickup-display unit (130) can be set to the gap between the image pickup surface of the photocathode and the display surface of the phosphor screen.

[0072] The above first error compensation unit (140) may be formed of a light-transmitting optical element capable of compensating for the optical distance (OPL: optical path length) of the main optical axis (OA) between the eyepiece lens (122) and the objective lens (121) in response to an error due to the thickness (L1) of the image capture-display unit (130) between the day mode and the night mode, when the distance between the eyepiece lens (122) and the objective lens (121) is determined based on the night mode.

[0073] It is preferable that the physical length (L) through which light passes through the first error compensation unit (140) be set to satisfy mathematical expression 1 when the thickness of the imaging-display unit (130) is L1 and the refractive index of the first error compensation unit (140) is n.

[0074]

[0075] Mathematical expression 1 is a calculation expression that is performed under the assumption that there is no protective window protecting the imaging surface of the imaging element (131) and the display surface of the display element (132). In general, if a protective window protecting the imaging surface and the display surface is taken into account, an expression relating the thickness and refractive index of the protective window protecting the imaging surface and the display surface can be derived from Mathematical expression 1. Since this can be easily derived by a person skilled in the art by referring to Mathematical expression 1, a detailed description thereof will be omitted.

[0076] The above mode switching unit (150) can position either the image-capturing display unit (130) or the first error compensation unit (140) between the primary optical axis (OA) between the objective lens (121) and the eyepiece lens (122) for selection of the day mode and the night mode, and when the first error compensation unit (140) enters the primary optical axis (OA) between the eyepiece lens (122) and the objective lens (121) by the mode switching unit (150), the day mode can be selected, and when the image-capturing display unit (130) enters the primary optical axis (OA) between the eyepiece lens (122) and the objective lens (121), the night mode can be selected.

[0077] The above mode switching unit (150) is configured to move the image-display unit (130) and the first error compensation unit (140) in a direction intersecting the primary optical axis (OA) between the eyepiece lens (122) and the objective lens (121), respectively.

[0078] For example, the mode switching unit (150) may include a transfer block (151) that supports the image-capturing display unit (130) and the first error compensation unit (140), an operating unit (152) that moves the transfer block (151) so that either the first error compensation unit (140) or the image-capturing display unit (130) is positioned on the main optical axis (OA), and a guide (153) that guides the movement of the transfer block (151).

[0079] The above-mentioned operating unit (152) may be formed in a form including a rotary knob (152a) rotatably supported on the housing (110) and a rotary arm (152b) extending radially from the rotation center of the rotary knob (152a).

[0080] In addition, on the surface of the transfer block (151) facing the pivot arm (152b), a guide groove (151a) is formed so that the other end of the pivot arm (152b) can be slidably supported so that the transfer block (151) can move linearly back and forth according to the rotational position of the pivot arm (152b).

[0081] That is, when the user rotates the rotary knob (152a) in one direction, the transport block (151) connected to the rotary arm (152b) moves along the guide (153) to the 1-1 position, and the imaging-display unit (130) moves away from the main optical axis (OA) and at the same time, the first error compensation unit (140) enters the main optical axis (OA), thereby selecting the daytime mode. When the user rotates the rotary knob (152a) in the other direction, the transport block (151) connected to the rotary arm (152b) moves along the guide (153) to the 1-2 position, and at the same time, the first error compensation unit (140) moves away from the main optical axis (OA) and at the same time, the imaging-display unit (130) enters the main optical axis (OA), thereby selecting the nighttime mode.

[0082] Meanwhile, in this embodiment, the operation unit (152) is described as having a rotary operation structure using a rotary knob (152a), but it may be configured in various forms, such as a sliding operation structure or a button operation structure, for convenience of operation depending on the usage environment.

[0083]

[0084] From now on, the operation of the first embodiment of the above-described day / night dual-purpose optical sight will be described.

[0085] Among the attached drawings, FIG. 8 is a drawing for explaining the optical error between the day mode and the night mode, and (a) of FIG. 8 shows the lens arrangement structure of a general daytime optical scope, (b) of FIG. 8 shows a state in which the image-display unit (130) is introduced onto the main optical axis (OA) between the objective lens (121) and the eyepiece lens (122) for selecting the night mode, and (c) of FIG. 8 shows a state in which the first error compensation unit (140) is introduced onto the main optical axis (OA) between the objective lens (121) and the eyepiece lens (122) for selecting the day mode.

[0086] As illustrated in (a) of Fig. 8, a typical daytime optical scope is set so that the entrance surface focus of the erecting optical section (12) matches the exit surface focus of the objective lens (11), and the entrance surface focus of the eyepiece lens (14) matches the exit surface focus of the erecting optical section (12). That is, the distance (D1) between the objective lens (11) and the eyepiece lens (14) can be set as the length from the right end of the main optical axis (OA) of the objective lens (11) through the erecting optical section (12) to the left end of the eyepiece lens (14).

[0087] Meanwhile, in the case where the image-capturing-display unit (130) is arranged on the principal optical axis (OA) between the objective lens (121) and the eyepiece lens (122) for selecting the night mode in the present embodiment as shown in (b) of FIG. 8, the image-capturing surface of the image-capturing element (131) must be arranged at the exit surface focus position of the erecting optical unit (123), and the display surface of the display element (132) must be arranged at the entrance surface focus position of the eyepiece lens (122). Accordingly, the distance (D2) between the objective lens (121) and the eyepiece lens (122) in the night mode is set to a length obtained by adding the thickness (L1) of the image-capturing-display unit (130) to the distance (D1) between the objective lens (121) and the eyepiece lens (122) of a general optical scope as shown in (a) of FIG. Accordingly, the image of the target re-established by the optical system (123) is incident on the imaging surface of the imaging element (131), and the image of the target emitted from the display surface of the display element (132) can be provided to the user's eyes through the eyepiece lens (122).

[0088] In this embodiment, in order to use the objective lens (121) and the eyepiece lens (122) in common in the day mode and the night mode, the distance (D2) between the objective lens (121) and the eyepiece lens (122) in the day mode is set to be the same as the distance (D2) between the objective lens (121) and the eyepiece lens (122) in the night mode, as shown in (b) and (c) of FIG. 8.

[0089] However, when the image-capturing-display unit (130) is moved away from the main optical axis (OA) between the objective lens (121) and the eyepiece lens (122) to switch from night mode to day mode, the exit surface focus position of the upright optical unit (123) and the entrance surface focus position of the eyepiece lens (122) are spaced apart by the thickness (L1) of the image-capturing-display unit (130), causing an optical error.

[0090] Therefore, in this embodiment, a first error compensation unit (140) is arranged on the main optical axis (OA) between the objective lens (121) and the eyepiece lens (122) to compensate for the optical error as described above when the day mode is selected. Since the first error compensation unit (140) can extend the optical distance between the objective lens (121) and the eyepiece lens (122) by the thickness (L1) of the image capture-display unit (130), it is possible to prevent an optical error by the thickness (L1) of the image capture-display unit (130) from occurring when the day mode is selected while using the objective lens (121) and the eyepiece lens (122) in common in the day mode and night mode.

[0091] The above first error compensation unit (140) is made of a light-transmitting optical element whose physical length through which light transmits is determined by considering the thickness (L1) of the image-capturing-display unit (130) and the refractive index of the first error compensation unit (140). Therefore, when it is placed on the principal optical axis (OA) between the objective lens (121) and the eyepiece lens (122), it is possible to extend the optical distance between the objective lens (121) and the eyepiece lens (122) by a length (L2) corresponding to the thickness (L1) of the image-capturing-display unit (130).

[0092] Among the attached drawings, FIG. 9 is a drawing showing a state in which the day mode is selected by the mode switching unit according to the first embodiment of the present invention, and FIG. 10 is a drawing showing a state in which the night mode is selected by the mode switching unit according to the first embodiment of the present invention.

[0093] When the first error compensation unit (140) is brought into the main optical axis (OA) between the objective lens (121) and the eyepiece lens (122) using the mode switching unit (150), the day mode is selected, and when the image capture-display unit (130) is brought into the main optical axis (OA), the night mode is selected.

[0094] First, let's look at the process of selecting the daytime mode through the mode switching unit (150) as follows.

[0095]

[0096] *As illustrated in FIG. 9, the transfer block (151) of the mode switching unit (150) is positioned so as to be movable along the guide (153) in the direction intersecting the main optical axis (OA) within the receiving space (113b) of the third housing (113) while the imaging-display unit (130) and the first error compensation unit (140) are each fixed, and the user can move along the guide (153) by operating the operating unit (152).

[0097] Specifically, the operation unit (152) is composed of a rotation knob (152a) that is rotatably supported on the outside of the cover portion (113c) of the third housing (113) and a rotation arm (152b) that is connected to the rotation knob (152a) on the inside of the cover portion (113c). In addition, a guide groove (151a) is formed on the surface of the transfer block (151) that faces the rotation knob (152a) at a position spaced apart from the central axis of the rotation knob (152a) and extends in one direction, and on which the distal end of the rotation arm (152b) is slidably supported.

[0098] Accordingly, when the user rotates the rotary knob (152a) in one direction to select the day mode, the transfer block (151) connected to the rotary arm (152b) moves along the guide (153) to the 1-1 position, and in this process, the imaging-display unit (130) moves away from the main optical axis (OA) and at the same time, the first error compensation unit (140) enters the main optical axis (OA), so that the light incident through the objective lens (121) and the upright optical unit (123) can pass through the first error compensation unit (140) and be transmitted to the eyepiece lens (122).

[0099] Meanwhile, the one-way rotation position of the above-mentioned rotary arm (152b) is supported by one side of the rotation guide inner part (113d) formed on the inner surface of the cover part (113c) of the third housing (113) while the transfer block (151) moves to the 1-1 position and the first error compensation part (140) is positioned on the main optical axis (OA), so that further rotation is restricted, and thus the 1-1 position of the transfer block (151) can be guided.

[0100] Next, as shown in Fig. 10, the process of selecting the night mode through the mode switching unit (150) is as follows.

[0101] When the user rotates the rotary knob (152a) in the other direction to select the night mode, the transfer block (151) connected to the rotary arm (152b) moves from the 1-1 position to the 1-2 position along the guide (153), and in this process, the first error compensation unit (140) moves away from the main optical axis (OA) and at the same time, the image capture-display unit (130) enters the main optical axis (OA). Accordingly, the light incident through the objective lens (121) and the erecting optical unit (123) is incident on the image capture element (131) of the image capture-display unit (130), and then is emitted in the form of a target image through the display element (132) arranged on the rear side of the image capture element (131) and provided to the eyepiece lens (122).

[0102] The other direction rotation position of the above-mentioned rotary knob (152a) is supported by the other side of the rotation guide inner part (113d) formed on the inner side of the cover part (113c) of the third housing (113) so that further rotation is restricted when the transfer block (151) moves to the 1-2 position and the image-display part (130) is positioned on the main optical axis (OA), so that the 1-2 position of the transfer block (151) can be guided.

[0103]

[0104] Next, a day / night dual-purpose optical sight according to a second embodiment of the present invention will be described.

[0105] Among the attached drawings, FIG. 11 is a partial cutaway perspective view of a second error compensation unit of a day / night dual-purpose optical sight according to a second embodiment of the present invention, FIG. 12 is a cross-sectional view of a day / night dual-purpose optical sight according to a second embodiment of the present invention, and FIGS. 13 and 14 are drawings showing the operating state of the second error compensation unit of a day / night dual-purpose optical sight according to a second embodiment of the present invention.

[0106] The first embodiment of the present invention described above is configured to optically compensate for the optical error between the day mode and the night mode using a first error compensation unit (140) made of a translucent optical element, whereas the second embodiment is configured to physically adjust the gap between the objective lens (121) and the eyepiece lens (122) to compensate for the optical error between the day mode and the night mode. To this end, the second embodiment omits the first error compensation unit (140) made of a translucent optical element, and instead includes a second error compensation unit (160) that can move the eyepiece lens (122) in the direction of the main optical axis (OA).

[0107] Specifically, the day / night dual-purpose optical sight according to the second embodiment of the present invention includes a housing (110), an objective lens (121), an eyepiece (122), an image-display unit (130), a second error compensation unit (160), and a mode switching unit (150). Except for the second error compensation unit (160), the housing (110), the objective lens (121), the eyepiece (122), the image-display unit (130), and the mode switching unit (150) are substantially the same as those of the first embodiment, and thus a detailed description thereof will be omitted.

[0108] The second error compensation unit (160) includes a moving member (161) that can move in the direction of the main optical axis (OA) with respect to the first housing (111) while the eyepiece lens (122) is fixed, a first stopper (162) that guides the moving position of the moving member (161) according to the selection of the daytime mode on the first housing (111), and a second stopper (163) that guides the moving position of the moving member (161) according to the selection of the nighttime mode on the first housing (111), and the moving distance (L2) of the moving member (161) limited by the first stopper (162) and the second stopper (163) is set to correspond to the thickness (L1) of the image-capturing-display unit (130), i.e., the gap between the imaging surface of the image capturing element (131) and the display surface of the display element (132).

[0109] The above moving member (161) may be formed in the shape of a pipe having an outer diameter that can be inserted into the inside of the first housing (111) and an inner diameter that can secure the eyepiece lens (122) to the inside.

[0110] The first stopper (162) is formed to protrude in a circumferential direction on the inner surface of the first housing (111) so as to contact the moving member (161) at a position where the moving member (161) moves in a direction approaching the objective lens (121), i.e., at a position where the entrance surface focus of the eyepiece (122) and the exit surface focus of the erecting optical unit (123) coincide, thereby limiting further movement of the moving member (161).

[0111] The second stopper (163) includes a spherical member (163a) arranged in an insertion groove formed on the outer surface of the movable member (161) and an elastic member (163b) that elastically supports the spherical member (163a) in a protruding direction. In addition, a recessed portion (164) into which the spherical member (163a) can be inserted is formed on the inner surface of the first housing (111) at a position where the movable member (161) moves away from the objective lens (121), i.e., at a position spaced apart from the first stopper (162) by the thickness (L1) of the imaging-display unit (130). It is preferable that this recessed portion (164) be formed circumferentially on the inner surface of the first housing (111) so that the spherical member (163a) of the second stopper (163) can be inserted regardless of the axial rotational position of the movable member (161).

[0112] From now on, the operation of the second embodiment of the above-described day / night dual-purpose optical sight will be described.

[0113] The second error compensation unit (160) can move the moving member (161) that fixes the eyepiece lens (122) in a direction approaching the objective lens (121) depending on the day mode selection, or can move the moving member (161) that fixes the eyepiece lens (122) in a direction away from the objective lens (121) depending on the night mode selection.

[0114] Specifically, as shown in (a) of FIG. 12, the moving member (161) of the second error compensation unit (160) can move in a direction inserted into the first housing (111), i.e., in a direction approaching the objective lens (121), when the image-display unit (130) is deviated from the main optical axis (OA) between the objective lens (121) and the eyepiece lens (122) for daytime mode selection. Since the moving member (161) is formed in a pipe shape inserted into the first housing (111), it can guide the movement of the eyepiece lens (122) fixed to the moving member (161) in the direction of the main optical axis (OA).

[0115] The movement position of the movable member (161) corresponding to the daytime mode is limited from further movement at a position (2-1 position) where it contacts the first stopper (162) protruding from the inner surface of the first housing (111). The 2-1 position of the movable member (161) corresponding to the daytime mode can be set to a position where the entrance surface focus of the eyepiece lens (122) and the exit surface focus of the erecting optical unit (123) are aligned.

[0116] In addition, as shown in (b) of FIG. 12, the moving member (161) of the second error compensation unit (160) can move in a direction protruding from the second housing (112), i.e., in a direction away from the objective lens (121), when the image-display unit (130) has entered the main optical axis (OA) between the objective lens (121) and the eyepiece lens (122) for selecting the night mode.

[0117] The moving position of the above-mentioned moving member (161) corresponding to the night mode is guided to a position (2-2 position) where the spherical member (163a) of the second stopper (163) arranged on the outer surface of the moving member (161) is inserted into the groove (164) formed on the inner surface of the first housing (111).

[0118] In order to select the night mode, when the image-capturing display unit (130) enters the main optical axis (OA) between the objective lens (121) and the eyepiece lens (122), the image-capturing surface of the image-capturing element (131) is positioned at the focus of the exit surface of the erecting optical unit (123). At this time, since the focus position of the eyepiece lens (122) must be positioned at the display surface of the display element (132) located on the back surface of the image-capturing element (131), it is preferable that the interval between the 2-1 position and the 2-2 position be set to a length (L2) corresponding to the thickness (L1) of the image-capturing display unit (130).

[0119] The spherical member (163a) of the second stopper (163) is elastically supported in the protruding direction by the elastic member (163b) while being accommodated in the insertion groove formed on the outer surface of the movable member (161). As shown in FIG. 13, in the process of the movable member (161) moving to the 2-1 position, it is pressed against the inner surface of the first housing (111) and maintains the state of being accommodated in the insertion groove.

[0120] In addition, the spherical member (163a) of the second stopper (163) is in a state of being elastically supported in a protruding direction by the elastic member (163b) while being in close contact with the inner surface of the first housing (111) during the process in which the movable member (161) moves toward the 2-2 position, and then, as shown in FIG. 14, when the movable member (161) moves to the 2-2 position and the recessed portion (164) formed on the inner surface of the first housing (111) moves to a position corresponding to the spherical member (163a), the spherical member (163a) protrudes by the elastic force of the elastic member (163b) and is inserted into the recessed portion (164). That is, the second-second position of the movable member (161) can be guided by the insertion of the spherical member (163a) of the second stopper (163) into the groove (164) of the first housing (111), and since the spherical member (163a) is maintained in the inserted state in the groove (164) by the elastic force of the elastic member (163b), the movable member (161) can be prevented from moving arbitrarily in the direction of the main optical axis (OA).

[0121]

[0122] Next, a day / night optical sight according to a third embodiment of the present invention, which includes a first image-display unit for selecting a first night mode and a second image-display unit for selecting a second night mode, will be described.

[0123] Among the attached drawings, FIG. 15 is a diagram showing the optical structure of each mode of a day / night dual-purpose optical sight according to a third embodiment of the present invention, and FIG. 16 is a diagram showing an example of a mode switching unit of a day / night dual-purpose optical sight according to a third embodiment of the present invention.

[0124] The third embodiment of the present invention, as illustrated in the above drawing, has a difference in configuration from the first and second embodiments described above in that it comprises two or more night mode image-display units having different characteristics, and is configured to place one of the two or more image-display units selected on the primary optical axis (OA) between the eyepiece lens (122) and the objective lens (121).

[0125] The above-mentioned imaging-display unit may include a first imaging-display unit (130-1) usable in a low-light environment and a second imaging-display unit (130-2) usable in an ultra-low-light environment.

[0126] For example, the first image capture-display unit (130-1) may be formed of a GEN III+ image intensifier tube that includes a photocathode (image capture unit) capable of acquiring an image in a low-light environment as a configuration corresponding to the image capture element (131) and a phosphor screen (display unit) that displays an image acquired from the photocathode as a configuration corresponding to the display element (132). In addition, the second image capture-display unit (130-2) may include a SIONYX XQE-1350 / 1351 sensor (image capture unit) of SIONYX capable of acquiring an image in an ultra-low-light environment as a configuration corresponding to the image capture element (131), and may include an OLED, LCD, LCOS, or micro LED display (display unit) as a configuration corresponding to the display element (132).

[0127] Accordingly, the day / night dual-purpose optical sight of the present embodiment can operate in a day mode in which the first image-capturing-display unit (130-1) and the second image-capturing-display unit (130-2) are excluded between the eyepiece lens (122) and the objective lens (121), a first night mode in which the first image-capturing-display unit (130-1) is arranged between the eyepiece lens (122) and the objective lens (121), and a second night mode in which the second image-capturing-display unit (130-2) is arranged between the eyepiece lens (122) and the objective lens (121).

[0128] It is not possible to use the first imaging-display unit (130-1) or the second imaging-display unit (130-2) by placing it between the eyepiece lens (14) and the objective lens (11) for use in the night mode while maintaining the gap (D1) between the eyepiece lens (14) and the objective lens (11) of a general daytime optical scope.

[0129] Because, as in (a) of Fig. 15, the daytime optical scope can view a clear image of an external object as a virtual image by setting the entrance surface focus position of the eyepiece lens (14) and the exit surface focus position of the erecting optical part (12) to match. That is, the distance (D1) between the objective lens (11) and the eyepiece lens (14) of the daytime optical scope can be set to the length from the right end of the main optical axis (OA) of the objective lens (11) through the erecting optical part (12) to the left end of the eyepiece lens (11).

[0130] In this state, when the first imaging-display unit (130-1) or the second imaging-display unit (130-2) is placed between the eyepiece lens (14) and the upright optical unit (12) for selecting the night mode, an optical error corresponding to the thickness (s2, s3) of the first imaging-display unit (130-1) or the second imaging-display unit (130-2) occurs, so that a clear image of an external object cannot be seen.

[0131] In this embodiment, for the purpose of using the objective lens (121) and the eyepiece lens (122) in common in the day mode, the first night mode, and the second night mode, as shown in (b) to (d-2) of FIG. 15, the distance (D2) between the eyepiece lens (122) and the objective lens (121) is set to be extended by a length (L2) corresponding to the thickness (s2) of the first image-display unit (130-1) compared to the distance (D1) of a general daytime optical scope.

[0132] That is, in a state where the first image-capturing-display unit (130-1) is placed between the eyepiece lens (122) and the erecting optical unit (123) for selection of the first night mode as in (c) of FIG. 15, the image-capturing surface of the first image-capturing-display unit (130-1) is aligned with the exit surface focus position of the erecting optical unit (123) and the display surface is aligned with the entrance surface focus position of the eyepiece lens (122), so that a clear image of an external object can be seen.

[0133] In addition, when the first image-display unit (130-1) is separated from the eyepiece lens (122) and the upright optical unit (123) for selecting the daytime mode as in (b) of FIG. 15, an optical error equal to the thickness (s2) of the first image-display unit (130-1) occurs between the upright optical unit (123) and the eyepiece lens (122), and therefore, a third error compensation unit (140-1) for compensating for this optical error is placed between the eyepiece lens (122) and the objective lens (121).

[0134] This third error compensation unit (140-1) is made of a light-transmitting optical element that can extend the optical distance of the main optical axis (OA) between the eyepiece lens (122) and the objective lens (121) by a length (L2) corresponding to the thickness (s2) of the first image-capturing-display unit (130).

[0135] The first imaging-display unit (130-1) and the second imaging-display unit (130-2) may have different thicknesses, and the imaging-display unit thickness (s2) of the GEN III+ image intensifier tube selected as the first imaging-display unit (130-1) is thicker than the imaging-display unit thickness (s3) of the SIONYX XQE-1350 / 1351 sensor and display unit selected as the second imaging-display unit (130-2).

[0136] Accordingly, when the second image-capturing-display unit (130-2) is placed between the eyepiece lens (122) and the upright optical unit (123) for selection of the second night mode, as in (d-1) and (d-2) of FIG. 15, an optical error corresponding to the difference in thickness between the first image-capturing-display unit (130-1) and the second image-capturing-display unit (130-2) occurs, and a fourth error compensation unit (140-2) for compensating for this optical error is placed between the eyepiece lens (122) and the objective lens (121) together with the second image-capturing-display unit (130-2).

[0137] This fourth error compensation unit (140-2) is made of a light-transmitting optical element that can extend the optical distance of the main optical axis (OA) between the eyepiece lens (122) and the objective lens (121) by the difference in thickness between the first imaging-display unit (130-1) and the second imaging-display unit (130-2).

[0138] If the thickness of the third error compensation unit (140-1) is s1, the refractive index is n1, the thickness of the fourth error compensation unit (140-2) is s4, the refractive index is n2, the thickness of the first imaging-display unit (130-1) is s2, and the thickness of the second imaging-display unit (130-2) is s3, the following mathematical equations 2 and 3 must be satisfied.

[0139]

[0140]

[0141] Mathematical expressions 2 and 3 are calculation expressions based on the assumption that there is no protective window protecting the imaging surface and display surface of the first imaging-display unit (130-1) and the second imaging-display unit (130-2). In general, considering the protective window protecting the imaging surface and the display surface, an expression relating the thickness and refractive index of the protective window can be derived. Since a person skilled in the art can easily derive this by referring to Mathematical expressions 2 and 3, a detailed explanation thereof will be omitted.

[0142] Meanwhile, the second image-capturing-display unit (130-2) and the fourth error compensation unit (140-2) for selecting the second night mode may be arranged on the display surface side of the second image-capturing-display unit (130-2) in a state where the image-capturing surface of the second image-capturing-display unit (130-2) is aligned with the exit surface focus position of the upright optical unit (123), as shown in (d-1) of FIG. 15, or may be arranged on the image-capturing surface side of the second image-capturing-display unit (130-2) in a state where the display surface of the second image-capturing-display unit (130-2) is aligned with the entrance surface focus position of the eyepiece lens (122), as shown in (d-2) of FIG. 15. Meanwhile, although not shown in the drawing, it may be possible to divide the fourth error compensation unit (140-2) into two parts and place them in front and behind the second imaging-display unit (130-2).

[0143] According to the above embodiment, switching between the day mode, the first night mode, and the second night mode is possible while maintaining the distance between the eyepiece lens (122) and the objective lens (121) constant, so that rapid mode switching is possible.

[0144]

[0145] Hereinafter, the configuration of the mode switching unit (150-1, 150-2) that can selectively place the third error compensation unit (140-1), the first image-capturing-display unit (130-1), the second image-capturing-display unit (130-2) and the fourth error compensation unit (140-2) on the main optical axis (OA) between the eyepiece lens (122) and the objective lens (121) for selection of the day mode, the first night mode and the second night mode will be described.

[0146] The above mode switching unit (150-1, 150-2) is configured to select one of the day mode, the first night mode, and the second night mode, and is configured to be positioned on the main optical axis (OA) between the eyepiece lens (122) and the objective lens (121) while moving in a direction intersecting the main optical axis (OA) between the eyepiece lens (122) and the objective lens (121) in order to select one of the day mode, the first night mode, and the second night mode by fixing the third error compensation unit (140-1) to the first position, fixing the first image-display unit (130-1) to the second position, and fixing the second image-display unit (130-2) and the fourth error compensation unit (140-2) to the third position.

[0147] That is, when the third error compensation unit (140-1) fixed to the first position of the mode switching unit (150-1, 150-2) by the user's operation enters the main optical axis (OA) between the eyepiece lens (122) and the objective lens (121), the day mode is selected, and when the first image-display unit (130-1) fixed to the second position of the mode switching unit (150-1, 150-2) enters the main optical axis (OA) between the eyepiece lens (122) and the objective lens (121), the first night mode is selected, and when the second image-display unit (130-2) and the fourth error compensation unit (140-2) fixed to the third position of the mode switching unit (150-1, 150-2) enter the main optical axis (OA) between the eyepiece lens (122) and the objective lens (121), the second night mode can be selected. there is.

[0148] For example, the mode switching unit (150-1) may be configured as a revolver type that selectively positions a third error compensation unit (140-1) fixed to a first position, a first image-display unit (130-1) fixed to a second position, a second image-display unit (130-2) fixed to a third position, and a fourth error compensation unit (140-2) on the main optical axis (OA) between the eyepiece lens (122) and the objective lens (121) while rotating around a rotation axis provided at an eccentric position from the main optical axis (OA) between the eyepiece lens (122) and the objective lens (121), as shown in (a) of FIG. 16.

[0149] In addition, the mode switching unit (150-2) may be configured as a sliding type that selectively places the third error compensation unit (140-1) fixed to the first position, the first imaging-display unit (130-1) fixed to the second position, the second imaging-display unit (130-2) fixed to the third position, and the fourth error compensation unit (140-2) on the main optical axis (OA) between the eyepiece lens (122) and the objective lens (121) while sliding in a direction intersecting the main optical axis (OA) as shown in (b) of FIG. 16.

[0150]

[0151]

[0152] *Next, a day / night dual-purpose optical sight according to the fourth embodiment of the present invention will be described.

[0153] Among the attached drawings, FIG. 17 is a configuration diagram of a day / night dual-purpose optical sight according to the fourth embodiment of the present invention.

[0154] A day / night optical sight according to a fourth embodiment of the present invention comprises a first exchange module (M1) for a day mode including an eyepiece (122), a second exchange module (M2) for a first night mode including an eyepiece (122) and a first image-capturing-display unit (130-1), and a third exchange module (M3) for a second night mode including an eyepiece (122) and a second image-capturing-display unit (130-2), and is configured such that any one of the first to third exchange modules (M1, M2, M3) can be detachably coupled to a barrel unit (M) including an objective lens (121), a reticle, and an erecting optical unit, thereby enabling selection of any one of the day mode, the first night mode, and the second night mode.

[0155] Specifically, as shown in (a) of Fig. 17, the first exchange module (M1) can be coupled to the optical tube (M) for selecting the daytime mode, and the coupling position of the first exchange module (M1) is set so that the entrance surface focus of the eyepiece (122) and the exit surface focus position of the erecting optical unit (123) are identical. Here, it is preferable that the first exchange module (M1) be configured to secure a space including the entrance surface focus of the eyepiece (122).

[0156] In addition, as shown in (b) of FIG. 17, a second exchange module (M2) can be coupled to the optical tube (M) for the first night mode selection, and the coupling position of the second exchange module (M2) is set so that the imaging surface of the imaging element (131) of the first imaging-display unit (130-1) and the output surface focus position of the upright optical unit (123) are aligned. At this time, the entrance surface focus position of the eyepiece lens (122) is set to be located on the display surface of the display element (132) of the first imaging-display unit (130-1).

[0157] In addition, as shown in (c) of FIG. 17, a third exchange module (M3) can be coupled to the telescope (M) for selecting the second night mode, and the coupling position of the third exchange module (M3) is set so that the imaging surface of the imaging element (131) of the second imaging-display unit (130-2) and the output surface focus position of the erecting optical unit (123) are aligned. At this time, the entrance surface focus position of the eyepiece lens (122) is set to be located on the display surface of the display element (132) of the second imaging-display unit (130-2).

[0158] That is, the optical tube (M) is configured to secure a space that does not include the focus of the exit surface of the optical tube (123), and preferably has a coupling structure that can guide the coupling position to a position where the focus positions match each other when any one of the first to third exchange modules (M1, M2, M3) is coupled as described above. Accordingly, the focus positions can be aligned simultaneously with coupling the first to third exchange modules (M1, M2, M3) to the optical tube (M).

[0159] Meanwhile, in this embodiment, it has been described as an example that one of the first to third exchange modules (M1, M2, M3) is detachably coupled to the optical shaft (M), but it is also possible to configure the mode switching unit (150-1, 150-2) so that one of the exchange modules selected is arranged on the main optical axis of the optical shaft (M) while the first to third exchange modules (M1, M2, M3) are fixed to the first to third positions of the mode switching unit (150-1, 150-2) as shown in FIG. 16.

[0160]

[0161] The scope of the present invention is not limited to the embodiments described above, but can be implemented in various forms within the scope of the appended claims. Any person skilled in the art, without departing from the spirit of the invention as claimed in the claims, may make various modifications to the invention, which are deemed to fall within the scope of the claims.

Claims

1. Housing; An eyepiece disposed at one end of the housing; An objective lens disposed at the other end of the housing; An image-display unit including an image pickup element positioned toward the objective lens in a region between the eyepiece lens and the objective lens and a display element positioned toward the eyepiece lens; A mode switching unit capable of moving the image-display unit away from the main optical axis between the eyepiece and the objective lens for selecting a day mode, or of bringing the image-display unit onto the main optical axis for selecting a night mode; and A day / night dual-purpose optical sight including an error compensation unit capable of compensating for optical errors due to the thickness of the imaging-display unit between the day mode and the night mode.

2. In paragraph 1, A day / night dual-purpose optical sight including a translucent optical element capable of compensating for an optical distance (OPL: optical path length) of the principal optical axis between the eyepiece lens and the objective lens in response to an error due to the thickness of the imaging-display unit between the day mode and the night mode, while the above error compensation unit maintains a constant distance between the eyepiece lens and the objective lens.

3. In paragraph 2, A day / night dual-purpose optical sight, wherein the physical length (L) through which light penetrates the above error compensation section is set to satisfy mathematical expression 1 when the thickness of the above imaging-display section is L1 and the refractive index of the error compensation section is n. -- (Equation 1) 4. In paragraph 2, A day / night dual-purpose optical sight in which the error compensation unit is arranged movably in the direction intersecting the primary optical axis within the housing so as to enter or exit the primary optical axis between the eyepiece lens and the objective lens.

5. In paragraph 2, A day / night dual-purpose optical sight including a mode switching unit, a transfer block supporting the image-display unit and the error compensation unit, and an operating unit for adjusting the position of the transfer block so that either the error compensation unit or the image-display unit is positioned on the main optical axis.

6. In paragraph 5, A day / night dual-purpose optical sight, wherein the above mode switching unit further includes a guide for guiding the movement of the transfer block.

7. In paragraph 5, The above operating unit includes a rotary knob rotatably supported on the housing and a rotary arm extending radially from the center of rotation of the rotary knob, A day / night dual-purpose optical sight having a guide groove formed on the surface of the above-mentioned transfer block facing the above-mentioned rotary arm and extending in one direction and supporting the other end of the above-mentioned rotary arm in a slidable manner.

8. In paragraph 1, A day / night dual-purpose optical sight, wherein the above error compensation unit is configured to move the eyepiece lens in the direction of the primary optical axis to compensate for an optical error due to the thickness of the imaging-display unit.

9. In paragraph 8, A day / night optical sight including a moving member that guides movement of the eyepiece in the direction of the primary optical axis on the housing, a first stopper that guides the movement position of the eyepiece for day mode operation on the housing, and a second stopper that guides the movement position of the eyepiece for night mode operation.

10. In paragraph 8, A day / night dual-purpose optical sight in which the distance of movement of the eyepiece lens by the above error compensation unit is set to correspond to the gap between the imaging surface of the imaging element and the display surface of the display element.

11. In paragraph 1, A day / night optical sight including a first imaging-display unit for a first night mode capable of acquiring images in a low-light environment and a second imaging-display unit for a second night mode capable of acquiring images in an environment different from the first imaging-display unit.

12. In paragraph 11, The distance between the eyepiece and the objective lens is set based on the first night mode in which the first imaging-display unit is placed between the eyepiece and the objective lens. The above error compensation unit includes a third error compensation unit that can compensate for the optical distance of the main optical axis in response to the error due to the thickness of the first imaging-display unit when the daytime mode is selected, and A day / night dual-purpose optical sight including a fourth error compensation unit capable of compensating for the optical distance of the main optical axis in response to an error due to a difference in thickness between the first imaging-display unit and the second imaging-display unit when the second night mode is selected.

13. In paragraph 12, A day / night dual-purpose optical sight, wherein the thicknesses (s1, s4) of the third error compensation unit and the fourth error compensation unit are set to satisfy mathematical expressions 2 and 3, where the thickness of the first imaging-display unit is s2, the thickness of the second imaging-display unit is s3, the refractive index of the third error compensation unit is n1, and the refractive index of the fourth error compensation unit is n2. -- (Equation 2) -- (Equation 3) 14. In paragraph 12, A day / night dual-purpose optical sight, wherein the mode switching unit fixes the third error compensation unit at the first position, fixes the first image-display unit at the second position, and fixes the second image-display unit and the fourth error compensation unit at the third position, and can position any one of the first to third positions on the main optical axis between the eyepiece and the objective lens to select any one of the day mode, the first night mode, and the second night mode.

15. In paragraph 14, The above mode switching unit is a day / night dual-purpose optical sight made of a revolver type or a sliding type.

16. The tube supporting the objective lens; First exchange module for day mode supporting eyepiece; A first image-display unit capable of acquiring and displaying an image in a low-light environment and a second exchange module for a first night mode supporting an eyepiece lens for forming an image displayed in the first image-display unit; and A second imaging-display unit including an imaging element capable of acquiring an image in an ultra-low light environment and a display element capable of displaying an image acquired from the imaging element, and a third exchange module for a second night mode supporting an eyepiece capable of forming an image displayed on the display element to the user's eyes, A day / night dual-purpose optical sight capable of selecting one of the day mode, the first night mode, and the second night mode by combining any one of the first to third exchange modules to the telescope according to the usage environment.

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