Dot-sight Device With Polarizers

Abstract

Disclosed is a dot-sight device with polarizers. The dot-sight device with polarizers includes: a reflecting mirror; a first polarizing unit provided in front of the reflecting mirror; a dot indication generator emitting a ray to the reflecting mirror to form a the dot virtual image; and a second polarizing unit provided in front of the dot indication generator, the first polarizing unit and the second polarizing unit being arranged so that a ray of the dot indication generator is passed through the second polarizing unit but blocked by the first polarizing unit. Thus, there is provided a dot-sight device with polarizers, in which a ray emitted from a dot indication generator is not discovered by the other party and thus a dot-sight observer is not discovered by the other party.

Description

CROSS-REFERENCE TO RELATED APPLICATION

[0001] This application claims the benefit of Korean Patent Application No. 10-2011-0121802, filed Nov. 21, 2011, which is hereby incorporated by reference in its entirety.

BACKGROUND OF THE INVENTION

[0002] 1. Field of the Invention

[0003] The present invention relates to a dot-sight device with polarizers, and more particularly to a dot-sight device with polarizers, in which a ray emitted from a dot indication generator is not discovered by the other party, and thus a dot-sight observer is not discovered by the other party.

[0004] 2. Description of the Related Art

[0005] The features of guns such as a rifle, a heavy machine gun, etc. depend on how quick an aimed shot is fired and how accurate a target is aimed. In general, the aiming of the guns is achieved by aligning a line of sight between the gun-sight and the foresight. The aiming based on alignment of the line of sight between the foresight located at an end of a gun barrel and the gun-sight located at a top of a gun body makes sharpshooting be possible according to abilities of an observer who uses the gun.

[0006] However, in the case of the aiming based on only the gun-sight and the foresight, even minor variation and shaking make it difficult to align the line of sight, and also short-distance firing or urgent situation make it difficult to do quick aiming.

[0007] That is, such an aimed-shot method requires complicated processes such as target capture and confirmation, alignment in the light of sight, aiming, etc. and requires time. Further, the foresight and the gun-sight are so small that accurate alignment therebetween is susceptible to minor shaking Moreover, if too much attention is paid to the alignment in the line of sight, the attention is drawn to the foresight and the gun-sight rather than a target or a front view and therefore vision needed for shooting or urgent situations becomes narrower.

[0008] To solve the foregoing problems, a dot-sight device has been proposed. The dot-sight device employs a lens of no magnification or low magnification in an optical sight, and uses a simple dot instead of a complicated line of sight.

[0009] The dot-sight device of optical no-magnification (low magnification) enables the simple and quick sight and it very useful in urgent situations or short distance. Specifically, it is possible to save time taken in conventional alignment in the line of sight, and the sight is achieved by positioning a dot (virtual image) on a target. Thus, an observer can afford to secure a view. Consequently, it is possible to quickly and accurately adjust a sight, and to secure a circumferential view needed for determining situations.

[0010] In detail, as shown in FIG. 1, a conventional dot-sight device 1 having a singlet reflecting mirror is fastened to a gun through a fastening grill 11, and is aligned with the gun barrel through a gun main scope tube aligning terminal 3. Then, a virtual dot provided to an observer, caused as a ray of a dot indication generator 5 is reflected from the reflecting mirror 7, is positioned on a target point, so that s/he can confirm the sight. Generally, a front (facing an observer in the dot-sight device 1) of the reflecting mirror 7 is coated to reflect the ray emitted from the dot indication generator 5, and the front and rear curvatures of the reflecting mirror 7 have spherical surfaces or aspheric surfaces.

[0011] An observer fires a shot when the virtual dot reflected from the reflecting mirror 7 is positioned on a gazing target point by no magnification through a protective window 9, that is, when the virtual image of the dot is aligned with the target. Thus, it is easy to adjust the sight.

[0012] However, in the case of the conventional dot-sight device, as shown in FIG. 1, a dot indication generator 5 is located in a place where most of the ray reflected from the reflecting mirror 7 travels without interference, and therefore the ray emitted from the dot indication generator 5 is not seen outside, thereby preventing an dot-sight observer from being discovered by the other party around the target. To this end, an optical axis of the reflecting mirror 7 has to be inclined at a certain angle (i.e., A1 of FIG. 2(a); a1 is generally a half of A2 formed by a path where a principal ray emitted from the dot indication generator is reflected from the reflecting mirror and travels toward a dot-sight optical axis) with respect to a representative ray (i.e., a principal ray: which is a center ray among the reflected rays and aligned with an optical axis of the dot sight) of the rays reflected from the reflecting mirror 7 and constituting the dot (i.e., an virtual image of dot indication from the reflecting mirror).

[0013] Then, as shown in (a) and (b) of FIG. 2, the arrangement of the reflecting mirror inclined with respect to the dot sight optical axis (refer to FIG. 2(a)) causes a finite ray aberration to be greater than that in the arrangement of the reflecting mirror not inclined with respect to the dot sight optical axis (refer to FIG. 2(b)), thereby having an effect on parallax of the dot to be observed by an observer. Also, the size (diameter) of the reflecting mirror and the dot indication generator are compared in the parallax under conditions having the same distance from the reflecting mirror, the arrangement of the reflecting mirror inclined with respect to the dot sight optical axis (refer to FIG. 2(a)) causes the parallax to be greater than that in the arrangement of the reflecting mirror not inclined with respect to the dot sight optical axis (refer to FIG. 2(b)).

[0014] The great parallax causes an error to become larger as a visual axis of an observer to a shooting target point in the reflecting mirror goes beyond the dot sight optical axis and gets closer to vicinity, with respect to an initial alignment state among an optical axis of the dot-sight device, a bullet shooting axis of the gun barrel, and the target point. Naturally, the excessive parallax deteriorates a hit degree to the target when the dot sight is used. In other words, the size of the reflecting mirror is limited by an inclined angle A1 of the reflecting mirror, in which the size of the reflecting mirror has to provide the parallax within a certain limit (i.e., a degree of parallax where a degree of deviation between the position of the target point and the position of the dot (an virtual image of the dot indication) is within the limit of eye's resolutions or within a shooting error reference).

[0015] However, if the dot indication generator is arranged as shown in (b) of FIG. 2 in order to prevent the excessive parallax, the ray emitted from the dot indication generator may be observed by the other party around the target, and it is thus not preferable.

[0016] Also, as shown in FIG. 3, the conventional dot sight has the reflecting mirror 7 of which curvature is designed depending on D1 and D2 (for example, a singlet mirror has two reflecting surfaces, and doublet mirrors has four reflecting surfaces (two reflecting surface among which have the same curvature)). Here, D1 is a horizontal distance in an optical axial direction of the dot sight from the optical center of the reflecting mirror 7 to the dot indication of the dot indication generator 5, and D2 is a vertical distance in the optical axial direction of the dot sight from the optical center of the reflecting mirror 7 o the inside of the dot sight housing 10 in a direction where the dot indication generator 5 is installed.

[0017] Particularly, the conventional dot sight cannot make the vertical distance at the position of the dot indication generator 5 in the dot sight optical axis C1 be shorter than D2 in order to prevent the rays emitted from the dot indication generator 5 from being exposed to the other party, and thus cannot make an angle between the optical axis C2 of the reflecting mirror and the optical axis C1 of the dot sight be smaller than A1 determined by D1 and D2

( A 1 = tan - 1 ( D 2 D 1 ) 2 ) . ##EQU00001##

[0018] Since the reflecting mirror inclined with respect to the dot sight optical axis has a finite ray aberration larger than that of the reflecting mirror not inclined with respect to the dot sight optical axis, the parallax around the reflecting mirror of the dot sight becomes larger.

[0019] Also, as shown in FIG. 1, the conventional arrangement of the dot indication generator allows the ray of the dot indication generator to be not seen at great distances in a close observation optical axis direction V1 of the dot sight so that an observer cannot be discovered by the other party around the target. However, the ray emitted by the dot indication generator of the dot sight in this case can be observed by the other party who gets out of the dot sight optical axis, for example, who is located at close distances in a direction of V2. Accordingly, it is disadvantageously impossible to fully prevent an observer of the dot sight from being exposed.

BRIEF SUMMARY

[0020] Accordingly, the present invention is conceived to solve the forgoing problems, and an aspect of the present invention is to provide a dot-sight device with polarizers, in which it is possible to not only prevent the ray emitted from the dot indication generator from being observed at the other party and thus prevent an observer from being discovered by the other party, but also freely design an angle between the dot indication of the dot indication generator and the optical axis of the dot sight on the reflecting mirror, thereby providing the dot-sight device with the polarizers, which can decrease the parallax of the reflecting mirror.

[0021] Also, an aspect of the present invention is to provide a dot-sight device with polarizers, in which even through the dot indication generator is arranged on the window arranged in front of the reflecting mirror in order to minimize the parallax of the reflecting mirror, it is possible to prevent the ray of the dot indication generator from being observed by the other party through the polarization member. Therefore, under the same distance from the reflecting mirror to the dot indication generator, it is possible to use the reflecting mirror larger than that of the conventional dot sight within a degree of parallax allowable in the existing dot sight. Further, under the same size of the reflecting mirror, it is possible to make the distance from the reflecting mirror to the dot indication generator be shorter than that of the conventional dot sight.

[0022] Further, an aspect of the present invention is to provide a dot-sight device with polarizers, in which if the ray of the dot indication generator is allowed to be exposed to the other party, it is possible to separate and remove the first polarizing unit from the front of the reflecting mirror, thereby securing sufficient quantity of incident light from the exterior as necessary.

[0023] One aspect of the present invention provides a dot-sight device with polarizers, comprising: a reflecting mirror; a first polarizing unit provided in front of the reflecting mirror; a dot indication generator emitting a ray to the reflecting mirror to form a the dot virtual image; and a second polarizing unit provided in front of the dot indication generator, the first polarizing unit and the second polarizing unit being arranged so that a ray of the dot indication generator is passed through the second polarizing unit but blocked by the first polarizing unit.

[0024] The first polarizing unit may be detachably assembled in front of the reflecting mirror.

[0025] The first polarizing unit and the second polarizing unit may include linear polarizers of which polarization directions are orthogonal to each other, or circular polarizers of which circular polarization directions are counter to each other.

[0026] The dot-sight device with the polarizers may further comprise a window which is arranged in rear of the reflecting mirror and to which the dot indication generator is fastened.

[0027] The dot indication generator may be provided in an area, where the reflecting mirror is projected in an optical axial direction of the dot sight, on the window.

[0028] The window may be formed with a transparent electrode circuit line to supply electric power to the dot indication generator.

BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The above and/or other aspects of the present invention will become apparent and more readily appreciated from the following description of the exemplary embodiments, taken in conjunction with the accompanying drawings, in which:

[0030] FIG. 1 is a view schematically showing an internal configuration of a general dot-sight device,

[0031] FIG. 2 is a concept view showing a degree of parallax according to positions of a dot indication generator,

[0032] FIG. 3 is a cross-section view of a conventional dot-sight device,

[0033] FIG. 4 is a perspective view of a dot-sight device with polarizers according to an embodiment of the present invention,

[0034] FIG. 5 is a rear perspective view of the dot-sight device with the polarizers according to an embodiment of the present invention,

[0035] FIG. 6 is a cross-section view of the dot-sight device with the polarizers according to an embodiment of the present invention,

[0036] FIG. 7 shows cross-section views of the dot-sight device with the polarizers according to other embodiments of the present invention,

[0037] FIG. 8 is a front view showing a window side in (c) of FIG. 7, and

[0038] FIG. 9 is a cross-section view showing another embodiment of the present invention.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0039] Prior to description, like numerals will refer to like elements through many exemplary embodiments, which are representatively described in an exemplary embodiment, and the other exemplary embodiments describe only different configurations.

[0040] Below, a dot-sight device with polarizers according to a first embodiment of the present invention will be described with reference to accompanying drawings.

[0041] Among the accompanying drawings, FIG. 4 is a perspective view of a dot-sight device with polarizers according to an embodiment of the present invention, FIG. 5 is a rear perspective view of the dot-sight device with the polarizers according to an embodiment of the present invention, and FIG. 6 is a cross-section view of the dot-sight device with the polarizers according to an embodiment of the present invention.

[0042] As shown therein, the dot-sight device with the polarizers according to an embodiment of the present invention includes a housing 110 formed with a main scope tube having a first end portion facing a target and a second end portion facing an observer; a reflecting mirror 120 formed in the first end portion of the main scope tube; a first polarizing unit 130 provided in front of the reflecting mirror 120; a dot indication generator 140 provided in the second end portion of the main scope tube; and a second polarizing unit 150 provided in front of the dot indication generator 140.

[0043] The housing 110 is internally formed with a closed or opened main scope tube and installed in a firearm such as guns or the like. Between the housing 110 and the firearm may be provided a zero adjuster that finely adjusts the position of the housing 110 in up, down, left and right directions.

[0044] The reflecting mirror 120 is provided in the first end portion of the main scope tube of the housing 110, and transmits an image of the target while reflecting the ray provided by the dot indication generator 140 toward an observer. An observer positions a virtual image of dot indication reflected from the reflecting mirror 120 on to the target so as to adjust the sight. The reflecting mirror 120 may be achieved by a singlet reflecting mirror 120 applied to a typical dot sight, a doublet reflecting mirror 120 disclosed in Korean Patent No. 10-0667472, titled of `dot sight`, or the likes.

[0045] The dot indication generator 140 is configured to have a light emitting means and a transparent reticle located at a front end of the light emitting means and forming the dot indication by transmitting the ray emitted from the light emitting means, or is configured to form the dot indication by activating a pixel like an OLED, an LED, an LCOS. Here, the transparent reticle has a pivotal structure and allows the kind of dot indication to be selected according to the kinds or distances of the target. If the dot indication generator 140 is achieved by the OLED, the LED, the LCOS, etc., it may be possible to activate a pixel at a desired position and finely adjust the shape or position of the dot.

[0046] The first polarizing unit 130 and the second polarizing unit 150 are respectively provided in front of the reflecting mirror 120 and the dot indication generator 140. If the first polarizing unit 130 and the second polarizing unit 150 are achieved by the linear polarizers, they are arranged to have polarization directions orthogonal to each other. If the first polarizing unit 130 and the second polarizing unit 150 are achieved by the circular polarizers, they are arranged to have circular polarization directions counter to each other.

[0047] In general, the circular polarizer is configured by combination of the linear polarizer and a quarter-wave plate. Thus, if the first polarizing unit 130 and the second polarizing unit 150 are configured by the linear polarizer and the circular polarizer, the linear polarizer constituting the first polarizing unit 130 and the linear polarizer of the circular polarizer constituting the second polarizing unit 150 are arranged to face each other while the polarization directions of the linear polarizers opposite to each other are perpendicular to each other, thereby preventing the ray of the dot indication generator 140 from traveling outwards. Also, if the first polarizing unit 130 and the second polarizing unit 150 are configured by a pair of circular polarizer, the linear polarizers respectively provided in the pair of circular polarizers are arranged to face each other while the polarization directions of the linear polarizers opposite to each other are perpendicular to each other, thereby preventing the ray of the dot indication generator 140 from traveling outward.

[0048] In this embodiment, the first polarizing unit 130 and the second polarizing unit 150 are achieved by the pair of linear polarizers of which polarization directions are orthogonal to each other or by the pair of circular polarizers of which the circular polarization directions are counter to each other, but not limited thereto. Alternatively, combination of at least two polarizing units may be used to prevent the ray of the dot indication generator 140 from traveling outward.

[0049] Now, operations of the dot-sight device with the polarizers according to the first embodiment will be described.

[0050] As shown in FIG. 6, in the dot-sight device with the polarizers according to the first embodiment, the first polarizing unit 130 and the reflecting mirror 120 are installed in turn from the outside to the first end portion located in front of the main scope tube of the housing 110, the dot indication generator 140 is installed to the second end portion in a direction facing the reflecting mirror 120, and the second polarizing unit 150 is installed in front of the dot indication generator 140.

[0051] The dot indication generator 140 may have a structure capable of forming the dot indication by activating the pixel like the OLED, LCD, LCOS, etc., or may have a structure including the light emitting means and the transparent reticle located at the front end of the light emitting means and forming the dot indication by transmitting the ray emitted from the light emitting means.

[0052] The housing 110, where the dot indication generator 140 and the reflecting mirror 120 are installed, is fastened to the guns (not shown) such as a mount for a heavy machine gun and adjusted in a zero point by the zero adjuster. Then, an observer confirms an external target through the first polarizing unit 130 and the reflecting mirror 120. At this time, the ray emitted from the dot indication generator 140 is reflected from the reflecting mirror 120 and enters an observer's eyes. The dot indication reflected from the reflecting mirror 120 forms a virtual image of a dot, and is recognized by an observer.

[0053] If the first polarizing unit 130 and the second polarizing unit 150 are the linear polarizers, the ray emitted from the dot indication generator 140 is converted into the ray of the linear polarized light having a certain direction while passing through the second polarizing unit 150. Then the polarized ray is reflected from the reflecting mirror 120 and observed by an observer's eyes in the form of a dot virtual image. However, the polarization direction of the ray emitted from the dot indication passed through the reflecting mirror 120 is orthogonal to the polarization direction of the ray capable of passing through the first polarizing unit 130, and thus blocked without traveling outward.

[0054] Also, if the first polarizing unit 130 and the second polarizing unit 150 are the circular polarizers, the ray emitted from the dot indication generator 140 is converted into the ray of the circular polarized light having a certain circular direction (e.g., rightward rotation) while passing through the second polarizing unit 150. Then the polarized ray is reflected from the reflecting mirror 120 and observed by an observer's eyes in the form of a dot virtual image. However, the polarization direction of the ray emitted from the dot indication passed through the reflecting mirror 120 is counter to the polarization direction (e.g., leftward rotation) of the ray capable of passing through the first polarizing unit 130, and thus blocked without traveling outward. Thus, in the state that the first polarizing unit 130 and the second polarizing unit 150 are installed as above, the ray generated by the dot indication generator 140 cannot pass through the first polarizing unit 130 provided in front of the reflecting mirror 120, thereby preventing the ray of the dot indication generator 140 from being observed by the other party and preventing an observer from being discovered.

[0055] Here, the first polarizing unit 130 and the second polarizing unit 150 maybe configured by coating a glass plate to have polarizing ability or attaching a polarizing film to the glass plate. Alternatively, they may be achieved by various methods, for example by inserting the polarizing film in between two glass plates, by a thick polarizing film, or etc.

[0056] Next, the dot-sight device with the polarizers according to a second embodiment of the present invention swill be described.

[0057] Among the accompanying drawings, FIG. 7 shows cross-section views of the dot-sight device with the polarizers according to other embodiments of the present invention, and FIG. 8 is a front view showing a window side in (c) of FIG. 7.

[0058] As shown in FIG. 7, this embodiment of the dot-sight device with the polarizers is different from the foregoing embodiment in that the housing 110 is a close type dot sight as opposed to the foregoing open type housing 110, a window 160 is arranged at a portion opposite to an observer's eyes, the dot indication generator 140 is fastened to the window 160, and the second polarizing unit 150 is provided in front of the dot indication generator 140.

[0059] (a) to (c) of FIG. 7 shows different positions where the dot indication generator 140 are located. Here, (a) of FIG. 7 shows that the dot indication generator 140 is arranged at the same position as that of the first embodiment; (b) shows that the dot indication generator 140 is arranged on the window 160 as being closer to the dot sight optical axis than that in (a) of FIG. 7, in which the ray emitted from the dot indication in the conventional dot sight is seen to the other party located in front of the dot sight; and (c) shows that the dot indication generator 140 is located at a position through which the optical axis of the dot sight can pass. Here, the parallax of the reflecting mirror 120 becomes smaller in order of (a), (b) and (c).

[0060] As shown in (b) and (c) of FIG. 7, even through the dot indication generator 140 is arranged to be adjacent to the dot sight optical axis on the window 160, or arranged on the position where the dot sight optical axis passes so as to decrease the parallax of the reflecting mirror 120, the ray of the dot indication generator 140 passed through the second polarizing unit 150 is blocked by the first polarizing unit 130 arranged in front of the reflecting mirror 120, so that the ray emitted from the dot indication generator 140 cannot be discovered by the other party around the target.

[0061] That is, in the dot-sight device with the polarizers according to the present invention, the dot indication generator 140 can be advantageously installed at an arbitrary position on the window 160 within the area where the reflecting mirror 120 is projected in an optical axis direction.

[0062] Also, not only when the dot indication generator according to the present invention is installed at the same position as the conventional dot sight, but also when the dot indication generator according to the present invention is installed to be closer to the dot sight optical axis on the window 160 as shown in (b) and (c) of FIG. 7, the ray of the dot indication generator 140 is blocked by the first polarizing unit 130 and the second polarizing unit 150. Therefore, under the same distance from the reflecting mirror 120 to the dot indication generator 140, it is possible to use the reflecting mirror 120 larger than that of the conventional dot sight within a degree of parallax allowable in the existing dot sight. Further, under the same size of the reflecting mirror 120, it is possible to make the distance from the reflecting mirror 120 to the dot indication generator 140 be shorter than that of the conventional dot sight.

[0063] That is, in the dot-sight device with the polarizers according to an embodiment of the present invention, the ray generated by the dot indication generator 140 is not exposed to the other party and therefore there is no limit to an angle between the optical axis of the reflecting mirror and the optical axis of the dot sight. Accordingly, if this angle is 0 as shown in (c) of FIG. 6, it is possible to configure the dot sight having the minimum parallax of the reflecting mirror among the dot sights having the same d1 and d2 as those of the conventional dot sight.

[0064] FIG. 8 shows that the dot indication generator 140 is attached and fastened to the window 160, in which the transparent electrode circuit line 170 (generally, a power supplying line) of the dot indication generator 140 may use a transparent electrode such as indium-tin oxide (ITO) attached to the window 160. If a signal or electric power is supplied by connecting edges of the dot indication generator 140 and the window 160 through the transparent electrode circuit line 170, it may be possible to observe an external target in a rear window area except the dot indication generator 140.

[0065] Further, according to still another embodiment of FIG. 8, the foregoing first polarizing unit 130 is mounted to a cap housing 111 shaped like a cap and coupled to the housing 110 in front of the reflecting mirror 120 by a detachable structure using an uneven groove. Thus, if the ray of the dot indication generator 140 has to be prevented from being exposed to the other party, the first polarizing unit 130 may be attached in front of the reflecting mirror 120. On the other hand, if the ray emitted by the dot indication generator 140 is allowed to be exposed to the other party, the first polarizing unit 130 together with the cap housing 111 is separated from the front view of the reflecting mirror 120, thereby securing, thereby additionally securing the quality of incident light from the exterior. Of course, there may be various methods of detaching and attaching the cap housing 111 mounted with the first polarizing unit 130.

[0066] According to an embodiment of the present invention, it is possible to not only prevent the ray emitted from the dot indication generator from being observed at the other party and thus prevent an observer from being discovered by the other party, but also freely design an angle between the dot indication of the dot indication generator and the optical axis of the dot sight on the reflecting mirror, thereby providing the dot-sight device with the polarizers, which can decrease the parallax of the reflecting mirror.

[0067] Also, even through the dot indication generator is arranged on the window arranged in front of the reflecting mirror in order to minimize the parallax of the reflecting mirror, it is possible to prevent the ray of the dot indication generator from being observed by the other party through the polarization member. Therefore, under the same distance from the reflecting mirror to the dot indication generator, it is possible to use the reflecting mirror larger than that of the conventional dot sight within a degree of parallax allowable in the existing dot sight. Further, under the same size of the reflecting mirror, it is possible to make the distance from the reflecting mirror to the dot indication generator be shorter than that of the conventional dot sight.

[0068] Further, if the ray of the dot indication generator is allowed to be exposed to the other party, it is possible to separate and remove the first polarizing unit from the front of the reflecting mirror, thereby securing sufficient quantity of incident light from the exterior as necessary.

[0069] While this invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims

1. A dot-sight device with polarizers, comprising: a reflecting mirror; a first polarizing unit provided in front of the reflecting mirror; a dot indication generator emitting a ray to the reflecting mirror to form a the dot virtual image; and a second polarizing unit provided in front of the dot indication generator, the first polarizing unit and the second polarizing unit being arranged so that a ray of the dot indication generator is passed through the second polarizing unit but blocked by the first polarizing unit.

2. The dot-sight device with polarizers according to claim 1, wherein the first polarizing unit is detachably assembled in front of the reflecting mirror.

3. The dot-sight device with polarizers according to claim 1, wherein the first polarizing unit and the second polarizing unit comprise linear polarizers of which polarization directions are orthogonal to each other, or circular polarizers of which circular polarization directions are counter to each other.

4. The dot-sight device with polarizers according to claim 1, further comprising a window which is arranged in rear of the reflecting mirror and to which the dot indication generator is fastened.

5. The dot-sight device with polarizers according to claim 4, wherein the dot indication generator is provided in an area, where the reflecting mirror is projected in an optical axial direction of the dot sight, on the window.

6. The dot-sight device with polarizers according to claim 5, wherein the window is formed with a transparent electrode circuit line to supply electric power to the dot indication generator.

7. The dot-sight device with polarizers according to claim 2, further comprising a window which is arranged in rear of the reflecting mirror and to which the dot indication generator is fastened.

8. The dot-sight device with polarizers according to claim 7, wherein the dot indication generator is provided in an area, where the reflecting mirror is projected in an optical axial direction of the dot sight, on the window.

9. The dot-sight device with polarizers according to claim 8, wherein the window is formed with a transparent electrode circuit line to supply electric power to the dot indication generator.

10. The dot-sight device with polarizers according to claim 3, further comprising a window which is arranged in rear of the reflecting mirror and to which the dot indication generator is fastened.

11. The dot-sight device with polarizers according to claim 10, wherein the dot indication generator is provided in an area, where the reflecting mirror is projected in an optical axial direction of the dot sight, on the window.

12. The dot-sight device with polarizers according to claim 11, wherein the window is formed with a transparent electrode circuit line to supply electric power to the dot indication generator.