Night vision device

Abstract

The utility model discloses a night vision device comprising a housing provided with an installation cavity, the front end of the installation cavity is provided with two openings arranged at intervals along a first preset direction, and the inner wall of the installation cavity is provided with a first guide structure extending along the first preset direction; the rear end of the observation cylinder assembly extends into the mounting cavity, the front end extends out of the mounting cavity from the corresponding opening, and the observation cylinder assembly is provided with a second guide structure in sliding fit with the first guide structure; and the stroke limiting structure is used for limiting the sliding stroke of the observation cylinder assembly. Through the sliding fit of the first guide structure and the second guide structure, the sliding adjustment of the observation cylinder assemblies is realized, so that the distance between the two observation cylinder assemblies is adjusted to adapt to different interpupillary distances within a certain range, the sliding directions of the two observation cylinder assemblies are the same, that is, the two observation cylinder assemblies move on the same straight line, the angle is not changed, and the observation cylinder assemblies are convenient to adjust. And the images observed by the two eyes are not inclined, so that the observation is more comfortable.

Description

TECHNICAL FIELD

[0001] The utility model relates to night vision instrument technical field, especially, relate to a night vision instrument. BACKGROUND

[0002] Night vision instrument can also be called night vision telescope, it is a kind of on the basis of telescope increases high-definition video and binocular stereo first viewing angle viewing and video recording, can help user to see object in dark environment, they pass through enhancement or conversion light wave to make the object that is difficult to distinguish in night or extremely low light condition become visible.Night vision instrument one of core components is image intensifier, it can convert weak light signal into enough strong electronic signal, then it is converted back to light signal for observation.Modern night vision instrument can include infrared thermal imager, low-light-level night vision instrument, etc., they have wide application in military, law enforcement, surveillance, field exploration and many other fields.The conventional night vision instrument cannot adapt to different pupil distance, and the pupil distance of different users is different, if the pupil distance of night vision instrument is fixed, then for part of users, the device can not be used comfortably.Although there are some night vision instruments that can realize pupil distance adjustment by rotating observation cylinder on the market, such as the night vision instrument disclosed in patent CN117310966A, it is connected by hinge connection between middle shell and left shell and right shell, can adjust pupil distance within a certain range to adapt to different pupil distance population, but hinge adjustment makes two observation cylinders be inclined, leading to the image observed by two eyes to exist certain inclination, which affects observation. SUMMARY

[0003] The utility model aims at at least one of the technical problems existing in prior art is solved.For this purpose, the utility model provides a night vision instrument, can realize adaptation to different pupil distance without changing image angle.

[0004] To achieve the above object, the utility model adopts the following technical scheme:

[0005] A night vision instrument, comprising: a shell provided with a mounting cavity, the mounting cavity is provided with two openings spaced apart along a first predetermined direction at the front end, and the inner wall of the mounting cavity is provided with a first guide structure extending along the first predetermined direction;Two observation cylinder assemblies are provided corresponding to the two openings, the rear end of the observation cylinder assembly extends into the mounting cavity, and the front end extends out of the mounting cavity from the corresponding opening, the observation cylinder assembly is provided with a second guide structure that is in sliding cooperation with the first guide structure, so that the observation cylinder assembly can slide along the first predetermined direction, thereby adjusting the distance between the two observation cylinder assemblies;A stroke limiting structure is used to limit the sliding stroke of the observation cylinder assembly.

[0006] Further, the first guide structure comprises a sliding groove arranged on the inner wall of the mounting cavity and extending along the first preset direction, and the second guide structure comprises a sliding strip arranged on the outer wall of the observation cylinder assembly, the sliding strip being embedded in the sliding groove and being capable of sliding along the sliding groove.

[0007] Further, the sliding groove and the sliding strip are correspondingly arranged in two groups, the two groups of sliding grooves being arranged on two opposite inner walls of the mounting cavity respectively, and the two groups of sliding strips being arranged on two opposite outer walls of the observation cylinder assembly respectively.

[0008] Further, the stroke limiting structure comprises a stopper arranged on the inner wall of the mounting cavity and located on the sliding path of the sliding strip, and the stopper is arranged at least two for each observation cylinder assembly, and the sliding strip is located between the two stoppers.

[0009] Further, the sliding strip and the sliding groove are arranged in a front-rear direction.

[0010] Further, the observation cylinder assembly comprises a cylinder body, the rear end of the cylinder body is provided with an embedding groove, the embedding groove is embedded with a display screen, and the rear end of the cylinder body is detachably provided with a cylinder cover for limiting the rear end of the display screen.

[0011] Further, the cylinder body is detachably provided with a guide cylinder, the mirror tube is slidably arranged in the guide cylinder in a front-rear direction, the eyepiece is arranged on the mirror tube, the rotation adjusting cylinder is rotatably arranged on the outer periphery of the guide cylinder, and the rotation adjusting cylinder is in transmission connection with the mirror tube, so that the mirror tube is driven to slide in the front-rear direction by rotating the rotation adjusting cylinder.

[0012] Further, the guide cylinder is provided with a waist-shaped groove on the peripheral wall, the guide column is detachably connected to the peripheral wall of the mirror tube, the guide column is arranged in the waist-shaped groove and is capable of sliding along the waist-shaped groove, the rotation adjusting cylinder is provided with a spiral groove on the peripheral wall, and the outer end of the guide column is embedded in the spiral groove.

[0013] Further, the middle part of the inner wall of the cylinder body is provided with an inwardly protruding connecting ring, the guide cylinder is embedded in the cylinder body and the rear end of the guide cylinder is connected with the connecting ring, and the outer peripheral wall of the guide cylinder and the inner wall of the cylinder body have an annular gap for embedding the rear end of the rotation adjusting cylinder.

[0014] Further, the rotation adjusting cylinder extends out of the cylinder body at the front end and is provided with a radially protruding convex shaft rotating section, the guide cylinder is provided with a limiting ring on the front side of the convex shaft rotating section, and the convex shaft rotating section is axially limited between the cylinder body and the limiting ring.

[0015] The utility model has the following beneficial effects:

[0016] The sliding adjustment of the observation cylinder assemblies is realized through the sliding cooperation of the first guide structure and the second guide structure, so that the interval of the two observation cylinder assemblies is adjusted to adapt to different pupil distances in a certain range, and the sliding directions of the two observation cylinder assemblies are the same, that is, the two observation cylinder assemblies move on the same straight line without changing the angle, so that the images observed by the two eyes are not inclined, and the observation is more comfortable.

[0017] In addition to the purposes, features and advantages described above, the utility model has other purposes, features and advantages. BRIEF DESCRIPTION OF DRAWINGS

[0018] The accompanying drawings, which form a part of this application, are included to provide a further understanding of the application, and are incorporated herein for explanation by reference. In the drawings:

[0019] Figure 1 is a structural schematic view of the embodiment of the utility model;

[0020] Figure 2 is a structural schematic view of the embodiment of the utility model; Figure 1 in the exploded state;

[0021] Figure 3 is an enlarged view of A of the embodiment of the utility model; Figure 2

[0022] Figure 4 is a structural schematic view of the shell in the exploded state;

[0023] Figure 5 is a sectional view of the observation cylinder;

[0024] Figure 6 is a structural schematic view of the observation cylinder in the exploded state;

[0025] Figure 7 is a structural schematic view of the guide cylinder, the lens barrel and the rotation adjustment cylinder.

[0026] LEGEND KEY:

[0027] The shell 100, the bottom shell 101, the top shell 102, the front cover 103, the mounting cavity 110, the opening 111, the sliding groove 120, the stop block 130;

[0028] ​The observation cylinder assembly 200, the slide 210, the reinforcing rib 211, the cylinder body 220, the embedding groove 221, the connecting ring 222, the display screen 230, the cylinder cover 240, the guide cylinder 250, the waist-shaped groove 251, the limiting ring 252, the eye protection sleeve 253, the lens barrel 260, the eyepiece 261, the guide column 262, the rotation adjusting cylinder 270, the helical groove 271, and the convex shaft screwing section 272. DETAILED DESCRIPTION

[0029] It should be understood that the specific embodiments described herein are merely exemplary and are not intended to limit the present application.

[0030] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0031] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative positional relationship, movement condition, etc. between components in a certain posture (as shown in the drawings), and if the certain posture changes, the directional indications will also change accordingly.

[0032] In addition, the description of "first", "second" and the like in the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the fact that a person skilled in the art can realize it, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the scope of protection required by the present application.

[0033] Please refer to Figure 1 and Figure 2 In one preferred embodiment of the present application, the night vision device comprises a shell 100, an observation cylinder assembly 200, and a stroke limiting structure.

[0034] The shell 100 is provided with a mounting cavity 110, the front end of the mounting cavity 110 is provided with two openings 111 which are spaced apart along a first predetermined direction, and the inner wall of the mounting cavity 110 is provided with a first guide structure extending along the first predetermined direction. Figure 2 The first predetermined direction is the left-right horizontal direction in

[0035] The observation cylinder assembly 200 is provided with two corresponding openings 111, that is, two observation cylinder assemblies 200 are arranged at left and right positions.

[0036] The observation cylinder assembly 200 is provided with two corresponding openings 111, that is, two observation cylinder assemblies 200 are arranged at left and right positions.

[0037] The first guide structure and the second guide structure are used for sliding cooperation, so that the sliding adjustment of the observation cylinder assembly 200 is realized, the interval of the two observation cylinder assemblies 200 is adjusted, different pupil distances can be adapted within a certain range, the sliding direction of the two observation cylinder assemblies 200 is the same, that is, the two observation cylinder assemblies 200 move on the same straight line without changing the angle, the images observed by the two eyes are not inclined, and the observation is more comfortable. Figure 2 Figure 3 In some embodiments of the utility model, the first guide structure includes a sliding groove 120 arranged on the inner wall of the installation cavity 110 and extending along the first preset direction, and the second guide structure includes a sliding strip 210 arranged on the outer wall of the observation cylinder assembly 200, the sliding strip 210 is embedded in the sliding groove 120 and can slide along the sliding groove 120, so that the sliding guide is realized by using the sliding strip 210 and the sliding groove 120, the observation cylinder assembly 200 slides along the first preset direction, the interval adjustment is realized, and different pupil distances can be adapted within a certain range.

[0038] In some embodiments of the utility model, the first guide structure includes a sliding groove 120 arranged on the inner wall of the installation cavity 110 and extending along the first preset direction, and the second guide structure includes a sliding strip 210 arranged on the outer wall of the observation cylinder assembly 200, the sliding strip 210 is embedded in the sliding groove 120 and can slide along the sliding groove 120, so that the sliding guide is realized by using the sliding strip 210 and the sliding groove 120, the observation cylinder assembly 200 slides along the first preset direction, the interval adjustment is realized, and different pupil distances can be adapted within a certain range. Figure 3 Figure 4 ​​In the specific embodiment of the utility model, two groups of the sliding groove 120 and the sliding bar 210 are correspondingly arranged, two groups of the sliding groove 120 are arranged on the two opposite inner walls of the mounting cavity 110 respectively, and two groups of the sliding bar 210 are arranged on the two opposite outer walls of the observation cylinder assembly 200 respectively, so that the spacing two groups of the sliding groove 120 and the sliding bar 210 are used to limit the observation cylinder assembly 200, specifically, the two groups of the sliding groove 120 and the sliding bar 210 are arranged in spacing up and down, and the observation cylinder assembly 200 is limited in the up and down direction. It can be understood that in order to position the sliding bar 210 immediately after the sliding groove 120 slides, the sliding cooperation between the sliding bar 210 and the sliding groove 120 can have appropriate damping, that is, the sliding bar 210 and the groove wall of the sliding groove 120 can rely on the extrusion friction force to position the assembled parts immediately; only when a larger external force (such as manual operation) is applied, the sliding bar 210 can slide in the sliding groove 120 to adjust the position after overcoming the static friction.

[0039] Referring to Figure 4 Specifically, the shell 100 specifically includes a bottom shell 101, a top shell 102 and a front cover 103, the bottom shell 101, the top shell 102 and the front cover 103 are connected by screws and form a mounting cavity 110, the sliding groove 120 is arranged on the opposite inner walls of the bottom shell 101 and the top shell 102, and the opening 111 is arranged on the front cover 103.

[0040] Referring to Figure 3 And Figure 4 In the further embodiment of the utility model, the stroke limiting structure includes a stopper 130 arranged on the inner wall of the mounting cavity 110 and located on the sliding path of the sliding bar 210, the stopper 130 is arranged on the sliding groove 120, the stopper 130 is correspondingly provided with at least two for each observation cylinder assembly 200, the two stoppers 130 are arranged in spacing left and right, and the sliding bar 210 is located between the two stoppers 130, so that the sliding bar 210 slides between the two stoppers 130, and the sliding range of the sliding bar 210 and the observation cylinder assembly 200 is limited.

[0041] Referring to Figure 3 And Figure 4 In the specific embodiment of the utility model, the sliding bar 210 and the sliding groove 120 are arranged in spacing along the front and back directions, so that multi-position sliding guide is realized, and the stability of the sliding of the observation cylinder assembly 200 is improved. Specifically, the sliding bar 210 and the sliding groove 120 are arranged in two rows in spacing along the front and back directions.

[0042] Referring to Figure 5 And Figure 6In some embodiments of the utility model, the observation cylinder assembly 200 includes cylinder body 220, and the slide bar 210 is specifically arranged on the outer wall of the cylinder body 220, and the slide bar 210 is provided with a reinforcing rib 211 on the side part to improve the structural strength. The rear end of the cylinder body 220 is provided with an embedding groove 221, the embedding groove 221 is embedded with a display screen 230, and the rear end of the cylinder body 220 is detachably provided with a cylinder cover 240 to limit the rear end of the display screen 230, so that the embedding groove 221 plays a positioning effect on the display screen 230, and the cylinder cover 240 is used to realize the installation and fixation of the display screen 230. Specifically, the cylinder cover 240 and the rear end of the cylinder body 220 are detachably connected through buckle connection, so that the installation and disassembly are facilitated, and fasteners are not needed, thereby reducing the use of fasteners.

[0043] Referring to Figure 5 and Figure 6 In further embodiments of the utility model, the cylinder body 220 is detachably provided with a guide cylinder 250, the guide cylinder 250 is slidably provided with a lens barrel 260 in the front-rear direction, the lens barrel 260 is provided with an ocular lens 261, the guide cylinder 250 is rotatably provided with a rotary adjusting cylinder 270 on the outer periphery, the rotary adjusting cylinder 270 is in transmission connection with the lens barrel 260, so that the lens barrel 260 is driven to slide in the front-rear direction by rotating the rotary adjusting cylinder 270, thereby realizing the adjustment of the ocular lens 261 close to or away from the display screen 230, realizing the focusing of the ocular lens 261 and the display screen 230, and adjusting the ocular lens 261 to the appropriate position, so that the observation is clearer. It can be understood that, in order to be more comfortable during use, the guide cylinder 250 is provided with an eye protection sleeve 253 on the front end.

[0044] It can be understood that the night vision device can be a low-light night vision device or an infrared night vision device. The low-light night vision device collects light through an objective lens, and the light is gathered to an image intensifier or an image sensor. The light signal is converted into an electrical signal through the image intensifier or the image sensor, and then the image is displayed on the display screen 230 through subsequent image processing. The infrared night vision device usually uses an infrared searchlight to irradiate a target, receives reflected infrared radiation to form an image, or relies on the infrared radiation of the target itself to form a thermal image. The image can also be displayed on the display screen 230. Therefore, whether it is a low-light night vision device or an infrared night vision device, the image viewed by the human eye is ultimately displayed on the display screen 230. The relative position relationship between the eyepiece 261 and the display screen 230 needs to be considered, and the distance between the eyepiece 261 and the display screen 230 is adjusted to adjust the eyepiece 261 to the best position so that the human eye can see the display screen 230 more clearly through the eyepiece 261. The imaging on the objective lens side and the viewing tube assembly 200 work independently of each other. For example, after the objective lens and the image sensor (or the image intensifier) are focused to achieve clear imaging, the display screen 230 can display a clear image. The pupil distance adjustment of the viewing tube assembly 200 does not affect the imaging on the objective lens side, and there is no need to consider the matching of the objective lens and the eyepiece 261. This scheme is a mature scheme in the field of night vision devices, and will not be described here.

[0045] In addition, as shown in Figure 2 and Figure 5 , the viewing tube assembly 200 (including the display screen 230 and the eyepiece 261) moves as a whole. The left eye and the right eye respectively look at their own display screen 230. Therefore, when adjusting, the sliding adjustment of the two viewing tube assemblies 200 does not need to be consistent. That is, when the distance between the two viewing tube assemblies 200 is adjusted to a pupil distance suitable for the human body, good observation can be achieved. The relative positions of the two viewing tube assemblies 200 to the housing 100 do not affect observation. Of course, when adjusting, the adjustment of the viewing tube assemblies 200 can be kept consistent. For example, through a gear and rack transmission structure, the two viewing tube assemblies 200 can be synchronously moved towards each other or moved away from each other. That is, when it is necessary to reduce the distance, the left viewing tube assembly 200 slides to the right by a certain distance, and the right viewing tube assembly 200 also slides to the left by a certain distance, so that the centers of the two viewing tube assemblies 200 are close to the center of symmetry of the housing 100. The center of gravity of the night vision device and the hand feeling when holding are better. However, whether the centers of the two viewing tube assemblies 200 coincide with the center of symmetry of the housing 100 and the distance therebetween do not affect observation, because the display screen 230 and the eyepiece 261 move as a whole, and the left eye and the right eye respectively look at their own display screen 230, without affecting each other.

[0046] Referring to Figure 6 and Figure 7In further embodiments of the present application, the guiding cylinder 250 is provided with a waist-shaped groove 251 on the peripheral wall, and the length direction of the waist-shaped groove 251 is the front-rear direction. The peripheral wall of the lens barrel 260 is detachably connected with a guiding column 262, the guiding column 262 is arranged in the waist-shaped groove 251 and can slide along the waist-shaped groove 251, the peripheral wall of the rotation adjusting cylinder 270 is provided with a helical groove 271, and the outer end of the guiding column 262 is embedded in the helical groove 271, so that the helical groove 271 is screwed to move and push the guiding column 262 to slide along the waist-shaped groove 251 by screwing the rotation adjusting cylinder 270, thereby realizing the position adjustment of the ocular lens 261. Specifically, the peripheral wall of the lens barrel 260 is provided with a threaded hole, and the guiding column 262 is screw-connected to the threaded hole, so as to realize the detachable installation of the guiding column 262, and when installed, the threaded hole, the waist-shaped groove 251 and the helical groove 271 are aligned, and then the guiding column 262 is installed, so as to avoid structural interference and facilitate assembly.

[0047] Referring to Figure 5 and Figure 6 In further embodiments of the present application, the inner wall of the barrel body 220 is provided with a connecting ring 222 protruding inward in the middle, the guiding cylinder 250 is embedded in the barrel body 220 and the rear end is connected with the connecting ring 222, and specifically, the rear end of the guiding cylinder 250 and the connecting ring 222 are provided with corresponding hole positions and are fixed by screws. The outer peripheral wall of the guiding cylinder 250 and the inner wall of the barrel body 220 have an annular gap for embedding the rear end of the rotation adjusting cylinder 270, so that the rear end of the rotation adjusting cylinder 270 is embedded in the annular gap, and the overall length size of the observation cylinder assembly 200 is smaller, and the structure is more compact.

[0048] Referring to Figures 5 to 7 In further embodiments of the present application, the front end of the rotation adjusting cylinder 270 extends out of the barrel body 220 and is provided with a radial protruding convex shaft screwing section 272, the outer periphery of the convex shaft screwing section 272 is provided with a friction pattern, facilitating screwing. The guiding cylinder 250 is provided with a limiting ring 252 in front of the convex shaft screwing section 272, and the convex shaft screwing section 272 is axially limited between the barrel body 220 and the limiting ring 252, so that the convex shaft screwing section 272 cannot be axially displaced, avoiding its random movement and causing unstable position of the ocular lens 261.

[0049] The above is only the preferred embodiments of the present application, and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A night vision device, characterized in that The utility model relates to a kind of telescopic microscope, including: Shell (100) is equipped with installation cavity (110), the installation cavity (110) front end is equipped with two interval settings along first preset direction opening (111), the first guide structure of the inner wall of installation cavity (110) is equipped with along first preset direction extension; Observation cylinder assembly (200) is equipped with two corresponding two openings (111), the observation cylinder assembly (200) rear end enters installation cavity (110), front end from corresponding opening (111) extends installation cavity (110), the second guide structure of the observation cylinder assembly (200) is equipped with with the first guide structure sliding cooperation to enable observation cylinder assembly (200) can slide along first preset direction, so as to adjust the interval of two observation cylinder assemblies (200); Stroke limiting structure is used to limit the sliding stroke of observation cylinder assembly (200).

2. The night vision device of claim 1, wherein, The first guide structure includes chute (120) being equipped in the inner wall of installation cavity (110) and extending along first preset direction, the second guide structure includes slide bar (210) being equipped in the outer wall of observation cylinder assembly (200), the slide bar (210) is embedded in chute (120) and can slide along chute (120).

3. The night vision device of claim 2, wherein, The chute (120) and the slide bar (210) are correspondingly equipped with two groups, two groups of chute (120) are respectively equipped on the two opposite inner walls of installation cavity (110), and two groups of slide bar (210) are respectively equipped on the two opposite outer walls of observation cylinder assembly (200).

4. The night vision device of claim 2, wherein, The stroke limiting structure includes stopper (130) being equipped in the inner wall of installation cavity (110) and being located on the sliding path of slide bar (210), the stopper (130) is equipped with at least two corresponding each observation cylinder assembly (200), and the slide bar (210) is located between two stoppers (130).

5. The night vision device of claim 2, wherein, The slide bar (210) and chute (120) are arranged along front-back direction interval.

6. The night vision device of claim 1, wherein, The observation cylinder assembly (200) includes cylinder body (220), the rear end of the cylinder body (220) is equipped with embedding groove (221), the embedding groove (221) is embedded with display screen (230), and the rear end of the cylinder body (220) is detachably installed with cylinder cover (240) to limit the rear end of display screen (230).

7. The night vision device of claim 6, wherein, The cylinder body (220) is detachably installed with guide cylinder (250), the mirror tube (260) is slidably installed in the guide cylinder (250) along front-back direction, the eyepiece (261) is installed on the mirror tube (260), the rotation adjustment cylinder (270) is rotatably sleeved on the outer periphery of the guide cylinder (250), the rotation adjustment cylinder (270) is connected with the mirror tube (260) transmission, so that the mirror tube (260) is driven to slide along front-back direction by screwing rotation adjustment cylinder (270).

8. The night vision device of claim 7, wherein, The circumferential wall of the guide cylinder (250) is provided with a waist-shaped slot (251), the circumferential wall of the lens barrel (260) is detachably connected with a guide column (262), the guide column (262) is arranged in the waist-shaped slot (251) and can slide along the waist-shaped slot (251), and the circumferential wall of the rotation adjusting cylinder (270) is provided with a spiral slot (271), and the outer end of the guide column (262) is embedded in the spiral slot (271).

9. The night vision device of claim 7, wherein, The middle part of the inner wall of the barrel body (220) is provided with an inwardly protruding connecting ring (222), the guide cylinder (250) is embedded in the barrel body (220) and the rear end is connected with the connecting ring (222), and the outer circumferential wall of the guide cylinder (250) and the inner wall of the barrel body (220) have an annular gap for embedding the rear end of the rotation adjusting cylinder (270).

10. The night vision device of claim 7, wherein, The front end of the rotation adjusting cylinder (270) extends out of the barrel body (220) and is provided with a radially protruding convex shaft screwing section (272), the guide cylinder (250) is provided with a limiting ring (252) in front of the convex shaft screwing section (272), and the convex shaft screwing section (272) is axially limited between the barrel body (220) and the limiting ring (252).

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