Calibration device and calibration method for single-tube eyepiece group cemented prism

Abstract

The application discloses a kind of glued prism's checking device and its checking method, for solving the checking problem that glued prism can reach precision requirement after installation, include correction seat, rotary plate, scale plate, scale plate seat, strut, flat plate, visual cylinder, right-angle prism and the objective lens front group of the glued prism to be detected containing;Correction seat, strut, right-angle prism are fixed on flat plate, rotary plate is connected on strut, visual cylinder is connected on rotary plate, scale plate, scale plate seat, the objective lens front group of the glued prism to be detected containing are installed on correction seat;Right-angle prism is used for calibration device;The objective lens front group of the glued prism to be detected containing is received by scale plate from parallel image after the reflection of glued prism bevel inner reflection surface, finally converts vertical image, to image target on visual cylinder scale plate.Thereby, the precision of glued prism itself and the assembly precision of glued prism can be quickly checked by using the device.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of collimation of optical eyepiece group, in particular to a collimation device of a single-tube eyepiece group cemented prism and a collimation method thereof. BACKGROUND

[0002] The eyepiece group is a visual optical device used for observing the image formed by the front optical system, and is a component of a visual optical instrument such as a telescope or a microscope. The main function of the eyepiece group is to magnify the real image obtained by the objective lens again. In order to correct aberration, the eyepiece group is usually composed of several lenses, and has a large field of view and a large angle of view magnification.

[0003] The cemented lens is formed by cementing a convex lens with a right-angle prism with a concave edge. The cementing of the optical prism is mainly to improve the image quality of the optical system, reduce the loss of optical energy, increase the imaging clarity, and further optimize the processing flow to meet the design requirements.

[0004] The detection of the angle of the cemented prism itself has professional detection means, but the application of the cemented prism often requires installation into a frame. For the installed cemented prism, the installation reference surface and the installation angle become particularly important. Therefore, it is necessary to check and assist in adjusting the precision of the installed cemented prism and the installation error precision to meet the use requirements of the installed cemented prism. SUMMARY

[0005] The present application provides a collimation device of a single-tube eyepiece group cemented prism and a collimation method thereof, aiming at the lack of a collimation device for checking whether the cemented prism can meet the use requirements after installation (assembly) in the prior art. The purpose of the present application is to check the machining precision of the prism itself through the device, and to adjust the precision of the prism after assembly through the device, and to greatly improve the efficiency of the assembly and adjustment of the eyepiece group, and to effectively guarantee the product quality.

[0006] The technical scheme of the present application is as follows:

[0007] The utility model provides a single tube ocular group cemented prism inspection device, including correction seat, rotating plate, scale plate, positioning shaft, screw cap, spring, scale plate seat, support rod, flat plate, diopter cylinder, right angle prism and the objective lens front group of containing cemented prism to be inspected, correction seat is connected and is fixed on the big surface of flat plate, the structure is empty, the side sets up the incision, the size of the incision can ensure the in-depth of adjusting cemented prism rotation auxiliary tool, support rod is solid structure, and the other end is connected and is fixed in flat plate, the fixed end of rotating plate is connected with support rod through pin, and its other end (the clamping end with hole) is screw type locking structure, scale plate seat is screwed into correction seat in the way of screw connection, scale plate is glued firmly in scale plate seat, spring is sleeved into positioning shaft, and then positioning shaft is pressed into the fixed end of rotating plate with screw cap, diopter cylinder is connected with the clamping end with hole of rotating plate, standard right angle prism is used for the calibration of device, and the objective lens frame of objective lens front group containing cemented prism to be inspected is connected with the empty part of correction seat through screw.

[0008] Further, the diopter cylinder adopts BJ-025 diopter cylinder (or diopter tube).

[0009] Further, the lower end surface of the correction seat has three Φ5.5 through holes for connecting and fixing the correction seat with the flat plate, the upper end surface of the correction seat has four M5 threaded holes for connecting and fixing the correction seat with the objective lens front group containing cemented prism to be inspected, and the two side surfaces of the correction seat are provided with two oval holes for adjusting the cemented prism in the objective lens front group and conforming to human engineering.

[0010] Further, the rotating plate is connected with the support rod through the pin, and the other end is a hole screw locking structure; the inner diameter of the hole meets the requirements of the BJ-025 diopter cylinder outer diameter.

[0011] Further, the scale plate is stably glued in the scale plate seat; the central position of the scale plate is engraved with a concentric circle, which is a target scale plate, and the imaging of the target scale plate and the cross image of the BJ-025 diopter cylinder scale plate are coincident.

[0012] Further, the scale plate seat is stably installed in the correction seat in the way of screw connection and point glue auxiliary; after the scale plate seat is installed in the correction seat, the lens surface of the objective lens front group does not interfere with the scale plate; after the scale plate seat is installed in the correction seat, the height difference can meet the requirement of being completely consistent with the internal reflection optical axis center of the cemented prism group in the objective lens front group, so as to ensure that the target imaging received by the scale plate is on the image scale plate of the BJ-025 diopter cylinder.

[0013] Further, the right angle prism reflects the parallel image of the incident light through the inclined edge reflection surface, and finally converts it into a vertical image, so as to form the target imaging on the BJ-025 diopter cylinder scale plate.

[0014] Further, the cemented prism in the objective lens group to be detected reflects the incident light parallel image through the inner reflection surface of the hypotenuse, and finally converts it into a vertical image, so as to image the target on the BJ-025 diopter cylinder scale.

[0015] Further, the relative positions of the rotating plate and the supporting rod are adjusted by the elastic mechanism of the left and right groups of positioning shafts, springs and screw caps.

[0016] Further, the BJ-025 diopter cylinder is installed into the corresponding hole of the rotating plate through the cooperation of the outer diameter of the lens barrel and the inner diameter of the rotating plate, and the clamping degree is adjusted by screwing in and out of the screw 11.

[0017] Further, the BJ-025 diopter cylinder is composed of an eyepiece part, a lens tube part and a slide tube part with an objective lens; the eyepiece part includes an eyepiece lens, a field lens and a scale plate, and ±5 diopters are marked on the eyepiece diopter adjustment ring; the lens tube surface of the lens tube part is marked with a longitudinal scale with 12 grid values; the smooth cylindrical surface of the slide tube part with an objective lens is in sliding cooperation with the inner hole of the lens tube, and the diopter value is determined by the position of the straight line index on the surface of the slide tube on the longitudinal scale of the lens tube.

[0018] Further, the scale plate is provided with concentric circles for adjusting and comparing with the cross image of the BJ-025 diopter cylinder scale.

[0019] Further, the single tube eyepiece group cemented prism detection device is convenient for detecting the change of the light after passing through the cemented prism, because the incident light is perpendicular to the outgoing light after being reflected by the lens and the cemented prism in the objective lens group.

[0020] The application also provides a detection method of the cemented prism detection device, the scale plate in the correction seat and the BJ-025 diopter cylinder scale form a double scale plate detection structure; the cemented prism in the objective lens group to be detected is regarded as a mirror when observed from the eyepiece side of the BJ-025 diopter cylinder, and when the cemented prism has an angle deviation, the reflected image does not coincide with the center image of the scale plate, and the position of the cemented prism is changed by adjusting the cemented prism adjusting screw; the coincidence degree of the center of the concentric circles of the cross image of the BJ-025 diopter cylinder scale and the scale plate in the correction seat indicates the deviation degree of the cemented prism.

[0021] The specific detection method comprises:

[0022] First, the cemented prism and the lens are assembled into the eyepiece frame according to the given process method, the optical parts are pressed tightly by the pressure ring, and the objective lens group containing the cemented prism is locked on the correction seat 1.

[0023] The target graduation image of the reticle is reflected back to the BJ-025 lensometer 15 through the internal reflection surface of the front group of the objective lens containing the cemented prism, and is imaged on the BJ-025 lensometer reticle. Two images (the cross image of the BJ-025 lensometer reticle and the concentric circle of the reticle) can be observed from the ocular side of the BJ-025 lensometer. If the centers of the two images coincide or the center of the cross image does not exceed the concentric circle, it indicates that the exit light of the assembled front group of the objective lens containing the cemented prism is perpendicular to the incident light, meeting the use requirements. If the center of the cross image of the two images exceeds the concentric circle, the cemented prism can be adjusted by adjusting the adjusting screw on the front group of the objective lens containing the cemented prism to ensure that the centers of the two images coincide or the center of the cross image does not exceed the concentric circle, that is, the exit light of the assembled front group of the objective lens containing the cemented prism is perpendicular to the incident light.

[0024] Compared with the prior art, the cemented prism inspection device and the inspection method thereof have the following beneficial effects:

[0025] 1. The clamping mode is consistent with the use state of the front group of the objective lens containing the cemented prism, so that the accuracy during use can be ensured.

[0026] 2. The clamping is convenient and simple, and the adjustment is quick.

[0027] 3. By using the cemented prism inspection device, the machining accuracy of the cemented prism itself can be checked, and the accuracy of the assembled cemented prism can be adjusted.

[0028] 4. By using the cemented prism inspection device, the efficiency of workpiece assembly and adjustment is greatly improved, and the product quality is effectively ensured. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is a structural schematic view of the cemented prism inspection device.

[0030] Figure 2 is a front view of Figure 1 .

[0031] Figure 3 is a sectional view of Figure 2 .

[0032] Figure 4 is a sectional view along A-A of Figure 2 .

[0033] Figure 5 is a structural schematic view of the lensometer (tube).

[0034] Figure 6 is a principle diagram of the cemented prism inspection device

[0035] Figures 7-10 is a geometric schematic view of the lensometer D.

[0036] The reference numerals in the figure are as follows:

[0037] 1: Calibration seat; 2: Rotating plate; 3: Reticle; 4: Positioning shaft; 5: Screw cap; 6: Spring; 7: Reticle seat; 8: Support rod; 9: Flat plate; 10: First screw; 11: Second screw; 12: Third screw; 13: Pin; 14: Diopter tube reticle; 15: Diopter tube; 16: Eyepiece front group containing glued prism to be inspected; 17: Right angle prism. Detailed Implementation

[0038] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0039] Example 1

[0040] like Figures 1-3 As shown, the adhesive prism calibration device of the present invention includes a calibration seat 1, a support rod 8, a rotating plate 2, a reticle 3, a reticle seat 7, a BJ-025 diopter tube 15, and an eyepiece front assembly 16 containing an adhesive prism to be inspected. The calibration seat 1 and the support rod 8 are fixed on the plate 9.

[0041] The calibration seat 1 is fixed to the plate 9 by three first screws 10; the reticle 3 is glued firmly to the reticle seat 7; the reticle seat 7 is installed into the calibration seat 1 by means of threaded connection and glue for a stable fit.

[0042] The support rod 8 is fixed to the plate 9 by three first screws 10; the rotating plate 2 is fixed to the support rod 8 by pins 13, and the relative position of the rotating plate 2 is adjusted by an elastic mechanism consisting of two sets of positioning shafts 4, springs 6, and screw caps 5.

[0043] The BJ-025 vision tube 15 is installed into the corresponding hole of the rotating plate 2 by matching the outer diameter of the lens tube with the inner diameter of the rotating plate, and its clamping degree is adjusted by screwing in and out the second screw 11.

[0044] The eyepiece front group 16 containing the glued prism to be inspected is connected to the calibration base 1 by four first screws 10 with the inner reflecting surface of the glued prism facing the reticle 3 in the calibration base 1.

[0045] The calibration seat 1 has a hollow structure and is used to install the front eyepiece group 16 containing the glued prism to be inspected. It is also used to place the standard right-angle prism 17 when calibrating the glued prism inspection device. Two oval holes are opened on the two sides above the reticle 3 of the calibration seat 1 for adjusting the glued prism in the front eyepiece group and in accordance with ergonomics.

[0046] After the reticle holder 7 is installed into the calibration holder 1, the installation distance must be sufficient to ensure that the lens surface of the eyepiece front group 16 containing the cemented prism to be inspected does not interfere with the reticle 3; after the reticle holder 7 is installed into the calibration holder 1, the height difference must be sufficient to be completely aligned with the center of the reflected optical axis of the cemented prism in the eyepiece front group 16 containing the cemented prism to be inspected, thereby ensuring that the target image received by the reticle 3 is imaged on the BJ-025 diopter tube reticle 14.

[0047] The right-angle prism 17 converts the parallel image received by the reticle 3 into a vertical image through reflection from its oblique reflective surface, thereby imaging the target onto the BJ-025 reticle 14.

[0048] The front eyepiece group 16 of the eyepiece containing the cemented prism receives the parallel image from the reticle 3 and reflects it through the inner reflecting surface of the inclined side of the cemented prism, thus converting it into a vertical image and imaging the target onto the BJ-025 diopter tube reticle 14.

[0049] In this embodiment, the first screw 10 is M5×16, the second screw 11 is M4×12, the third screw 12 is M4×15, and the pin 13 is A5×40.

[0050] Working principle of the adhesive prism calibration device of the present invention:

[0051] like Figure 5 As shown, the BJ-025 vision tube 15 described in this invention can be a commercially available vision inspection lens (vision lens), such as a product of Northern Optoelectronics.

[0052] The BJ-025 diopter tube 15 consists of an eyepiece section, a tube section, and a sliding tube section with an objective lens. The eyepiece section includes an eyepiece lens, a field lens, and a reticle 14. The diopter adjustment ring of the eyepiece is engraved with ±5 diopters for adjusting the diopter during use. The tube section has a vertical scale with 12 divisions on its surface, with an "∞" symbol in the middle and a "1" at ±4 divisions, representing a diopter value. Each division is 0.25 diopters. The smooth cylinder of the sliding tube section with the objective lens slides in conjunction with the inner hole of the tube. The diopter value is determined by the position of the linear index on the sliding tube surface on the vertical scale of the tube.

[0053] The BJ-025 diopter tube 15 works on the following principle: the reticle 14 and the eyepiece can perform axial focusing relative to the objective lens. When the reticle's reticle surface is on the rear focal plane of the objective lens, the diopter reading is zero. When it is close to the objective lens, the reading is positive, and when it is far from the objective lens, the reading is negative.

[0054] like Figure 7 As shown, the diopter D of an optical instrument can be determined by the distance L from the vertex P of the emitted beam to the exit pupil (from the eye point to the image point) using the following formula:

[0055] or

[0056]

[0057] As Figure 8 shown, when the infinite object point is imaged on the objective image focus F′ 物 by the objective lens of the optical instrument, if the objective image focus F′ 物 coincides with the eyepiece object focus F 目 , the light beam emitted from the eyepiece is parallel light beam, at this time L = ∞, and the diopter is

[0058] As Figure 9 shown, when the infinite object point is imaged on the objective image focus F′ 物 by the objective lens of the optical instrument, if the objective image focus F′ 物 falls outside the eyepiece object focus F 目 , the emitted light beam is convergent light beam, at this time L is +, and the diopter is

[0059] As Figure 10 shown, when the infinite object point is imaged on the objective image focus F′ 物 by the objective lens of the optical instrument, if the objective image focus F′ 物 falls inside the eyepiece object focus F 目 , the emitted light beam is divergent light beam, at this time L is -, and the diopter is

[0060] As Figure 6 shown, the device adopts the principle of diopter testing mirror (diopter mirror), and is mainly composed of a BJ-025 diopter tube 15, a standard right-angle prism 17 (to be detected eyepiece front group 16 containing a cemented prism), and a scale plate 3.

[0061] Principle of the cemented prism testing and correcting device:

[0062] Firstly, the incident light passes through the target scale 3 to the reflecting surface of the standard right-angle prism 17, the standard right-angle prism 17 reflects the light to the BJ-025 diopter cylinder 15, and through the ocular observation of the BJ-025 diopter cylinder 15, two images (the cross image of the BJ-025 diopter cylinder scale 14 and the concentric circle image of the scale 3) can be observed. If the center of the cross image of the BJ-025 diopter cylinder scale 14 and the concentric circle image of the scale 3 coincide, it indicates that the glued prism calibration device has been calibrated and can be used for the calibration of the objective lens front group 16 to be detected containing the glued prism; if the center of the cross image of the BJ-025 diopter cylinder scale 14 and the concentric circle image of the scale 3 do not coincide, the third screw 12 is adjusted to ensure the vertical direction, and the elastic mechanism composed of the positioning shaft 4, the spring 6 and the screw cap 5 is adjusted to ensure the horizontal direction, until the centers of the two images coincide. At this time, the calibration of the glued prism calibration device is completed, and the third screw 12 and the elastic mechanism composed of the positioning shaft 4, the spring 6 and the screw cap 5 cannot be adjusted again in the subsequent use process of the device.

[0063] Secondly, the standard right-angle prism 17 is removed, the objective lens front group 16 to be detected containing the glued prism is installed, the incident light passes through the target scale 3 to the reflecting surface of the glued prism of the objective lens front group 16 to be detected containing the glued prism, and then the target is imaged on the BJ-025 diopter cylinder scale 14 through the reflection of the internal reflecting surface of the glued prism to be detected.

[0064] The glued prism calibration device of the application is mainly used for the assembly precision of the glued prism relative to the frame after the glued prism is assembled in the objective lens front group.

[0065] Specific use method: firstly, the glued prism and the lens are assembled into the objective lens frame according to the given process method, the optical size is ensured by the spacer between the glued prism and the lens, finally, all the optical parts are pressed in the objective lens frame by the pressing ring, and the objective lens front group 16 to be detected containing the glued prism is connected to the calibration seat 1 through the four first screws 10 in the direction of the scale 3 in the calibration seat 1.

[0066] The incident light passes through the target scale 3 to the reflecting surface of the glued prism of the objective lens front group 16 to be detected containing the glued prism, and then the target horizontal image is reflected as a vertical image through the internal reflecting surface of the glued prism, and finally imaged on the BJ-025 diopter cylinder scale 14.

[0067] Two images (the cross image of the BJ-025 diopter cylinder scale plate 14 and the concentric circle of the scale plate 3) can be observed through the BJ-025 diopter cylinder 15 ocular lens. If the centers of the two images coincide or the center of the cross image does not exceed the concentric circle, it indicates that the exiting light of the assembled objective lens front group 16 containing the cemented prism is perpendicular to the incident light, which meets the use requirements. If the center of the cross image of the two images exceeds the concentric circle, the adjustment screw on the objective lens front group 16 containing the cemented prism can be adjusted to change the assembly position of the cemented prism to ensure that the centers of the two images coincide or the center of the cross image does not exceed the concentric circle, that is, the exiting light of the assembled objective lens front group 16 containing the cemented prism is perpendicular to the incident light, which meets the use requirements.

[0068] The precision requirement for the assembly of the objective lens front group containing the cemented prism is ± 25'. Therefore, the image scale plate 13 of the designed cemented prism detection device is designed as two concentric circles, and the detection precisions correspond to ± 15' and ± 25' respectively.

[0069] For example: the calculation method of the scale plate diameter d1 corresponding to the precision of ± 15':

[0070] According to d1=y=f'tg2α, it is known that the focal length f' of the objective lens front group containing the cemented prism to be detected is 44.84 mm, α=15' / 60'=0.25°, and d1=44.84*tg(2*0.25)≈0.39 mm. That is, the circle with a diameter of 0.39 mm on the image scale plate 13 corresponds to a precision of ± 15'.

[0071] Similarly, if higher precision is required, the corresponding image scale plate 13 can be redesigned to achieve it.

[0072] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any skilled person in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A single tube objective lens group cemented prism calibration device, characterized in that: it comprises a calibration seat (1), a rotating plate (2), a scale plate (3), a positioning shaft (4), a screw cap (5), a spring (6), a scale plate seat (7), a support rod (8), a flat plate (9), a power cylinder (15), a lens group (16) to be detected containing a cemented prism, and a right-angle prism (17); the calibration seat (1) is fixed on the flat plate (9) by a screw, the scale plate (3) is stably adhered in the scale plate seat (7) by glue, and the scale plate seat (7) is stably installed in the calibration seat (1) by thread connection with the aid of glue; the support rod (8) is fixed on the flat plate (9) by a screw, the rotating plate (2) is fixed on the support rod (8) by a pin, and the relative position of the rotating plate (2) is adjusted by two sets of elastic mechanisms composed of the positioning shaft (4), the spring (6) and the screw cap (5); the power cylinder (15) is installed in the corresponding hole of the rotating plate (2) by matching the outer diameter of the lens barrel with the inner diameter of the rotating plate, and the clamping degree is adjusted by screwing in and out; the lens group (16) to be detected containing a cemented prism is connected to the calibration seat (1) by four screws in the direction of the internal reflection surface of the cemented prism facing the scale plate (3) in the calibration seat (1); the power cylinder (15) adopts a BJ-025 power cylinder, which is composed of an eyepiece connecting part, a lens barrel part and a slide cylinder part with an objective lens; the eyepiece connecting part includes an eyepiece lens, a field lens and a power cylinder scale plate (14); the power cylinder scale plate (14) is provided with a cross image, and the scale plate (3) is provided with a plurality of concentric circles; the right-angle prism (17) reflects the parallel image received by the scale plate (3) through the reflection surface of the hypotenuse, and finally converts it into a vertical image, so as to image the target on the power cylinder scale plate (14); the calibration of the device is carried out by observing the coincidence degree of the overlapping of the concentric circle center of the scale plate (3) and the cross image of the power cylinder scale plate (14); after the scale plate seat (7) is installed in the calibration seat (1), the lens surface of the lens group (16) containing a cemented prism does not interfere with the scale plate (3); after the scale plate seat (7) is installed in the calibration seat (1), the height difference is completely consistent with the internal reflection optical axis center of the cemented prism of the lens group (16) containing a cemented prism, so as to ensure that the target image received by the scale plate (3) is imaged on the power cylinder scale plate (14); the calibration seat (1) is an inner hollow structure, which is used for installing the lens group (16) to be detected containing a cemented prism, and is also used for placing a standard right-angle prism (17) during calibration of the cemented prism calibration device; two oval holes are opened on the upper sides of the scale plate (3) of the calibration seat (1), which are used for adjusting the cemented prism in the lens group and meet the ergonomics.

2. The cemented prism calibration device according to claim 1, characterized in that: one end of the rotating plate (2) is connected with the support rod (8) through a pin (13), and the other end is a hole screw locking structure; the inner diameter of the hole of the hole screw locking structure matches the outer diameter of the power cylinder (15) for installation and locking. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 3. The collimating prism calibration device according to claim 1, characterized in that: The calibration device of the single-tube eyepiece group collimating prism reflects the incident light on the reflecting surface of the collimating prism and then reflects the vertical image on the surface of the diopter cylinder scale, thereby detecting the change of the light passing through the collimating prism.

4. The collimating prism calibration device according to claim 1, characterized in that: The diopter adjustment ring of the eyepiece is engraved with ±5 diopters; the surface of the mirror tube part is engraved with a longitudinal scale with 12 grid values; the smooth cylindrical surface of the slide tube part with the objective lens is in sliding fit with the inner hole of the mirror tube, and the diopter value is determined by the position of the straight line index on the longitudinal scale of the mirror tube.

5. A method of collimating a cemented prism collimator, characterized by, The method for calibrating the collimating prism using the calibration device according to any one of claims 1 to 4 comprises the following steps: S1: The collimating prism and the lens are assembled into the eyepiece frame according to the process method, the optical size between the collimating prism and the lens is ensured by the spacer, and finally the pressure ring is used to press all the optical parts in the eyepiece frame; the objective lens front group (16) to be detected containing the collimating prism is connected to the correction seat (1) by screws; S2: The incident light passes through the target scale plate (3) and reaches the reflecting surface of the collimating prism of the objective lens front group (16) to be detected, then the horizontal image is reflected as a vertical image by the internal reflecting surface of the collimating prism, and finally the image is formed on the diopter cylinder scale plate (14); S3: The cross image on the diopter cylinder scale plate (14) and the two images of concentric circles on the scale plate (3) can be observed through the eyepiece of the diopter cylinder (15); if the centers of the two images coincide or the center of the cross image does not exceed the concentric circles, it indicates that the exit light of the objective lens front group (16) to be detected containing the collimating prism after assembly is perpendicular to the incident light, which meets the use requirements; if the center of the cross image exceeds the concentric circles, go to the next step; S4: Adjust the adjusting screw of the objective lens front group (16) containing the collimating prism to change the assembly position of the collimating prism to ensure that the centers of the two images coincide or the center of the cross image does not exceed the concentric circles, that is, the exit light of the objective lens front group (16) containing the collimating prism after assembly is perpendicular to the incident light, which meets the use requirements.

Images