A null detection device

Abstract

The present application relates to a kind of zero position detection devices, including lens barrel, the lens barrel is successively provided with positive crescent lens A, double concave lens B, positive crescent lens C, double convex lens D-1 and double concave lens D-2 tight connection constituting cementing group along optical path from front to back in the direction of incidence;A pair of front support leg assemblies is symmetrically arranged in the front part of the lens barrel, rear support leg assembly is arranged in the middle position below the rear part of the lens barrel, the rear end of the lens barrel is sleeved with the adjusting cylinder that can be adjusted forward and backward, the rear end of the adjusting cylinder can be detached and fixed sleeve of scale plate is installed with scale plate in the inside of the fixed sleeve of scale plate.The zero position detection device of the present application is compact in structure, small in space occupation, simple in operation, high in detection efficiency and accurate in detection, can be used for a long time after calibration without moving the device, does not need to use after adjusting the device each time, saves time and manpower, and is convenient to use.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optical lens, in particular to a zero position detection device. BACKGROUND

[0002] For optical lens, in the lens debugging link, there is an important step that is zero position detection, through the standardized detection device, the optical axis consistency of the lens is measured. The detection devices on the market are various, most of which are complex to operate and occupy large space, resulting in inconvenient use sometimes. SUMMARY

[0003] Therefore, the purpose of the present application is to provide a zero position detection device which occupies small space, is convenient to use and simple to operate.

[0004] The present application adopts the following scheme: a zero position detection device, comprising a lens barrel, a cemented group composed of a positive crescent lens A, a double concave lens B, a positive crescent lens C, a double convex lens D-1 and a double concave lens D-2 in sequence from the front to the rear along the optical path in the lens barrel; a pair of front support leg assemblies are symmetrically arranged on both sides of the front part of the lens barrel, a rear support leg assembly is arranged at the middle position below the rear part of the lens barrel, an adjusting barrel capable of sliding forward and backward is sleeved in the rear end of the lens barrel, a detachable scale board fixing sleeve is arranged at the rear end of the adjusting barrel, and a scale board is arranged in the scale board fixing sleeve.

[0005] Further, the front support leg assembly comprises a front support frame fixed on the lens barrel by a screw, an adjusting nut is arranged on the front support frame, a front vertical screw rod is arranged in the adjusting nut and threadedly matched with the adjusting nut, a front support leg is arranged below the front vertical screw rod, the lower end of the front vertical screw rod is rotatably connected to the front support leg, and a front rotating wheel is sleeved on the front vertical screw rod.

[0006] Further, the lower end of the front vertical screw rod is connected with a rotating block, the rotating block is rotatably matched with the front support leg through a plurality of steel balls, a rod cap is arranged above the adjusting nut and buckled on the upper end of the front vertical screw rod, and the lower end of the rod cap is connected to the front support frame.

[0007] Further, the rear support leg assembly comprises a rear support frame fixed on the lens barrel by a screw and a rear vertical screw rod rotatably connected to the bottom of the rear support frame, a rear support leg is arranged below the rear vertical screw rod, a threaded hole is formed in the rear support leg, the lower end of the rear vertical screw rod is threadedly connected to the threaded hole of the rear support leg, and a rear rotating wheel is sleeved on the rear vertical screw rod.

[0008] Further, the adjusting cylinder is adjusted by a gear and rack mechanism, the gear and rack mechanism comprises a gear rod which is rotationally connected to the bottom of the lens barrel and is perpendicular to the axial line of the lens barrel, the bottom of the adjusting cylinder is fixedly connected with a rack which is parallel to the axial line of the adjusting cylinder, a gear which is engaged with the rack is sleeved on the gear rod, a hand wheel is connected to the end of the gear rod, and the side of the lens barrel is threadedly connected with a locking screw which is used for locking the adjusting cylinder.

[0009] Compared with the prior art, the zero detection device has the advantages of compact structure, small space occupation, simple operation, high detection efficiency and high detection accuracy, and can be used for a long time after one-time calibration without moving the device and adjusting the device before use, thereby saving time and labor and being convenient to use.

[0010] In order to make the purpose, technical scheme and advantages of the present application clearer, the present application will be further described in detail below with specific examples and related drawings. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 It is a schematic diagram of the overall structure of the embodiment of the present application.

[0012] Figure 2 It is a schematic diagram of the lens of the embodiment of the present application.

[0013] Figure 3 It is a schematic diagram of the front supporting leg assembly of the embodiment of the present application.

[0014] Figure 4 It is a schematic diagram of the rear supporting leg assembly of the embodiment of the present application.

[0015] Figure 5 It is a schematic diagram of the gear and rack mechanism of the embodiment of the present application.

[0016] Figure 6 It is a transfer function curve of the embodiment of the present application.

[0017] Figure 7 It is a relative luminance curve of the embodiment of the present application.

[0018] Figure 8 It is a distortion curve of the embodiment of the present application.

[0019] Explanation of reference numerals in the drawings: 1 - lens barrel, 2 - adjusting barrel, 3 - front support leg assembly, 31 - rod cap, 32 - front vertical screw rod, 33 - front support frame, 34 - adjusting nut, 35 - front rotating wheel, 36 - rotating block, 37 - steel ball, 38 - front support leg, 4 - rear support leg assembly, 41 - rear support frame, 42 - rear rotating wheel, 43 - rear vertical screw rod, 44 - rear support leg, 5 - gear and rack mechanism, 51 - scale, 52 - hand wheel, 53 - gear rod, 54 - rack, 55 - gear, 6 - reticle fixing sleeve, 7 - reticle, 8 - front lens group, 9 - rear lens group. DETAILED DESCRIPTION

[0020] It should be noted that the following detailed description is exemplary in nature and is intended to provide further description of the application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0021] It is also important to note that the terms used herein are not intended to limit the particular embodiments of the present application disclosed in this specification. Rather, unless otherwise specified, as used herein, the singular forms "a," "an" and "the" are intended to include the plural forms as well, i.e., meaning "one or more" or "at least one." Further, it should be noted that, where used herein, the terms "comprise", "comprising", "comprises", "include", "including", "includes", "contain", "containing", "contains", "characterized by" and / or "characterised by" shall be construed as referring to the features, steps, operations, devices, components and / or combinations thereof, etc. described in the specification and not to preclude the presence or addition of one or more other features, steps, operations, devices, components and / or combinations thereof, etc.

[0022] As Figures 1-8As shown, a zero position detection device includes a lens barrel 1, the lens barrel 1 is provided with a cemented group composed of a positive meniscus lens A, a double concave lens B, a positive meniscus lens C, a double convex lens D-1 and a double concave lens D-2 in sequence from front to back along the optical path, the positive meniscus lens A, the double concave lens B and the positive meniscus lens C constitute a front lens group, and the double convex lens D-1 and the double concave lens D-2 constitute a rear lens group; a pair of front support leg assemblies 3 are symmetrically arranged on both sides of the front part of the lens barrel, and a rear support leg assembly 4 is arranged at the middle position below the rear part of the lens barrel; an adjusting barrel 2 capable of sliding forward and backward is sleeved in the rear end of the lens barrel, a scale plate fixing sleeve 6 is detachably arranged at the rear end of the adjusting barrel 2, and a scale plate 7 is arranged in the scale plate fixing sleeve 6; the scale plate fixing sleeve 6 is connected to the rear end of the adjusting barrel 2 by screws, so that different scale plates can be replaced; the focal length of the device is 1500mm, the effective space between the structural members is reasonably utilized, the overall structure is designed and calculated carefully, the control gap between the parts is controlled, the gap and the mounting form are used to reduce the overall size, improve the space utilization, reduce the occupied space, adjust the size of the device, and achieve the effects of compact structure and small space. In use, the lens shaking caused by the surrounding environment is minimized, the reliability of the zero position detection data is improved, the detection efficiency is high and the detection accuracy is high, the occupied space is small, the operation is simple, the device can be used for a long time after calibration without moving the device, and the device does not need to be adjusted and used every time, saving time and labor.

[0023] In the embodiment, the front support leg assembly 3 includes a front support frame 33 fixed on the lens barrel by screws, the front support frame 33 is a clamp structure formed by two parts connected by screws, an adjusting nut 34 is arranged on the front support frame 33, the adjusting nut 34 is connected to the front support frame 33 by screws, a front vertical screw 32 is arranged in the adjusting nut and threadedly connected to the adjusting nut, a front support leg 38 is arranged below the front vertical screw, the lower end of the front vertical screw is rotatably connected to the front support leg 38, and a front rotating wheel 35 is arranged on the front vertical screw.

[0024] In the embodiment, the lower end of the front vertical screw 32 is connected to a rotating block 36, the rotating block 36 is rotatably connected to the front support leg through a plurality of steel balls 37; a rod cap 31 is arranged on the upper end of the front vertical screw and buckled on the lower end of the front vertical screw, the rod cap is connected to the front support frame, and the appearance is neat and safe in use; by rotating the front rotating wheel 35, the front support frame 33 can be raised or lowered under the drive of the steel balls 37, and the center height and the level can be adjusted.

[0025] In the embodiment, the rear support foot assembly 4 comprises a rear support frame 41 fixed on the lens barrel by screws and a rear vertical screw 43 rotatably connected to the bottom of the rear support frame, the rear support frame is a clamp structure formed by two parts connected by screws, a rear support foot 44 is arranged below the rear vertical screw 43, a threaded hole is formed in the rear support foot 44, the lower end of the rear vertical screw is threadedly connected to the threaded hole of the rear support foot, and a rear rotating wheel 42 is sleeved on the rear vertical screw; the rear support foot assembly adjusts the overall structure height through the rear rotating wheel, so that the center height of the rear support foot assembly is consistent with that of the front support foot assembly, the body performance index of the detection device is improved, the rear rotating wheel 42 is rotated to reach the same horizontal height as the front support foot assembly, and each part is fixed by shellac after adjustment; three-point support, the front and rear support foot assemblies are both height-adjustable, and the adjustment range is ±40 mm.

[0026] In the embodiment, the adjusting barrel is adjusted by sliding through a gear and rack mechanism 5, the gear and rack mechanism 5 comprises a gear rod 53 rotatably connected to the bottom of the lens barrel and perpendicular to the axis of the lens barrel, the bottom of the adjusting barrel is fixedly connected with a rack 54 parallel to the axis of the adjusting barrel, a gear 55 engaged with the rack is sleeved on the gear rod, a hand wheel 52 is connected to the end of the gear rod, and locking screws are threadedly connected to the side of the lens barrel to lock the adjusting barrel; after the kinematic pair, the image plane position can be smoothly moved in the horizontal direction without causing the optical axis to shake; the gear 55 is fixed on the gear rod 53 by a pressing ring, the adjusting barrel is moved forward and backward by rotating the hand wheel 52, the front and back position adjustment of the reticle is realized, and the adjustment range is not less than ±10 mm.

[0027] In the embodiment, the bottom and the side of the connecting section of the lens barrel and the adjusting barrel are respectively provided with slot holes, the slot hole at the bottom is used to give way to the rack, and the slot hole at the side is used to install a scale 51; the use position can be determined by reading the reading of the scale 51, and the position information can be accurately read by the size reading marked on the scale 51, so that the position adjustment is facilitated during the next debugging.

[0028] In the embodiment, the lens barrel is composed of four sections, and the two adjacent sections are connected together by screws; the front lens group is located in the inner part of the front end of the first section, and the front support foot assembly is located below the first section; the rear lens group is located in the inner part of the rear end of the third section, and the rear support foot assembly is located on both sides of the third section; the adjusting barrel is sleeved in the fourth section, and the rear end of the adjusting barrel extends out of the rear end of the lens barrel; the device is fastened by glue at each threaded connection, and the taper end set screw is fastened by glue in the nest, so as to ensure firm connection and improve the performance of anti-vibration and impact resistance, and the inner walls of the lens barrel, the pressing rings and the spacers are processed with a plurality of tooth grooves with appropriate width, and are coated with extinction paint, so that the lens barrel inner wall scatters and absorbs stray light radiation, thereby achieving the purpose of suppressing stray light.

[0029] The specific parameters of each lens are as follows:

[0030]

[0031] The above device achieves the following technical indicators:

[0032] 1. Focal length: f'=1500 mm;

[0033] 2. Aperture ≥ 150 mm;

[0034] 3. Full aperture flatness difference ≥ 10";

[0035] 4. Target surface ≥ 40 mm, field of view ≥ ±1.14°;

[0036] 5. Light guide requirement: after adjustment, the angle between the parallel light pipe exit light and the horizontal direction is not greater than 10";

[0037] 6. Horizontal display: a water bubble perpendicular to each other is arranged at the top middle position of the parallel light pipe, and the water bubble accuracy is 15" / 2 mm;

[0038] 7. Working waveband: visible light waveband.

[0039] Any technical solution disclosed in the above application, unless otherwise stated, if it discloses a numerical range, the disclosed numerical range is a preferred numerical range, and any person skilled in the art should understand that the preferred numerical range is only one of the many implementable numerical values with more obvious technical effects or representative values. Because there are too many values, it is impossible to enumerate, so the application discloses some values to illustrate the technical solutions of the application, and the above enumerated values should not constitute a limitation on the protection scope of the application.

[0040] If the application discloses or involves mutually fixed connecting parts or structural parts, unless otherwise stated, the fixed connection can be understood as: detachable fixed connection (for example, using bolt or screw connection), and can also be understood as: non-detachable fixed connection (for example, riveting, welding), of course, the mutual fixed connection can also be replaced by an integral structure (for example, manufactured by integral forming process) (obviously, integral forming process cannot be used).

[0041] In addition, the terms used to represent the position relationship or shape in any technical solution disclosed in the above application include the approximate, similar or close state or shape, unless otherwise stated.

[0042] Any component provided by the application can be assembled from multiple individual components, or can be a single component manufactured by integral forming process.

[0043] The above merely describes preferred embodiments of the present application, but is not intended to limit the present application to other forms, and any person skilled in the art can make changes or modifications to the above disclosed technical contents into equivalent embodiments with equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiments without departing from the technical solution content of the present application, and according to the technical essence of the present application, still belongs to the protection scope of the technical solution of the present application.

Claims

1. A null detection apparatus, characterized by: The lens barrel comprises a lens barrel, a positive crescent lens A, a double-concave lens B, a positive crescent lens C, a double-convex lens D-1 and a double-concave lens D-2 which are arranged in the lens barrel in sequence along the optical path from the front to the rear in the direction of incidence; a pair of front support leg assemblies are symmetrically arranged on both sides of the front part of the lens barrel, a rear support leg assembly is arranged at the middle position below the rear part of the lens barrel, an adjusting barrel which can be adjusted forward and backward is sleeved in the rear end of the lens barrel, a scale plate fixing sleeve which can be detached is arranged at the rear end of the adjusting barrel, and a scale plate is arranged in the scale plate fixing sleeve; the front support leg assembly comprises a front support frame which is fixed on the lens barrel by screws, an adjusting nut is arranged on the front support frame, a front vertical screw rod is arranged in the adjusting nut in threaded cooperation, a front support leg is arranged below the front vertical screw rod, the lower end of the front vertical screw rod is rotatably connected to the front support leg, and a front rotating wheel is sleeved on the front vertical screw rod; the rear support leg assembly comprises a rear support frame which is fixed on the lens barrel by screws and a rear vertical screw rod which is rotatably connected to the bottom of the rear support frame, a rear support leg is arranged below the rear vertical screw rod, a threaded hole is arranged in the rear support leg, the lower end of the rear vertical screw rod is threadedly connected to the threaded hole of the rear support leg, and a rear rotating wheel is sleeved on the rear vertical screw rod; the adjusting barrel is adjusted by sliding through a gear and rack mechanism, the gear and rack mechanism comprises a gear rod which is rotatably connected to the bottom of the lens barrel and is perpendicular to the axis of the lens barrel, a rack which is parallel to the axis of the adjusting barrel is fixedly connected to the bottom of the adjusting barrel, a gear which is engaged with the rack is sleeved on the gear rod, a hand wheel is connected to the end of the gear rod, and a locking screw which is used to lock the adjusting barrel is threadedly connected to the side of the lens barrel.

2. The null detection apparatus of claim 1, wherein: The lower end of the front vertical screw rod is connected to a rotating block, the rotating block is rotatably connected to the front support leg through a plurality of steel balls, a rod cap is arranged above the adjusting nut and is buckled on the upper end of the front vertical screw rod, and the lower end of the rod cap is connected to the front support frame.

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