Range finder for synchronizing images of scenery at different distances on focal plane of eyepiece

Abstract

The utility model discloses a range finder with images of scenery at different distances synchronized on an eyepiece focal plane, which comprises an objective lens group, an image plane synchronizing mirror, an inverted image prism group, an LCD (liquid crystal display) and an eyepiece group which are sequentially arranged from a scenery side to an eye side along an optical axis L. A laser range finding module transmits measured scenery distance data to the LCD for displaying; the image plane synchronous mirror is driven by a top speed synchronous driving mechanism, the top speed synchronous driving mechanism comprises a stepping motor, a motor driving circuit and a single-chip microcomputer MCU, and the laser ranging module synchronously transmits measured scenery distance data to the single-chip microcomputer MCU for processing. The single chip microcomputer MCU converts scenery distance data into position data of the image plane synchronous mirror and outputs a signal to drive the stepping motor to quickly move the image plane synchronous mirror to a preset position, so that scenery is imaged on the image plane of the LCD and synchronously displayed with the scenery distance data displayed on the LCD, and the device is accurate, quick and easy to operate.

Description

TECHNICAL FIELD

[0001] The utility model belongs to a range finder of different distance scene image synchronously on the eyepiece focal plane. BACKGROUND

[0002] The general laser range finder, including telescopic optical system and laser ranging module, wherein telescopic optical system includes objective lens group, reverse image prism group, LCD display and eyepiece group in order along the optical axis from the scene side to the eye side, objective lens group, reverse image prism group, LCD display and eyepiece group are installed in an outer shell, eyepiece group is moved left and right along the optical axis L by manual adjustment, to adjust the distance between eyepiece group and LCD display, so that people with different vision can clearly watch the data displayed on LCD display, laser ranging module sends the distance data of the scene measured to LCD display, and the specific structure is shown in the utility model patent with the patent number CN201721525575 and the name of a range-finding telescopic system composed of plastic aspherical lens. The laser range finder has the following problems: Figure 1 As shown in the figure, the scene moves from infinity to the objective lens group, until it moves to 3 meters away from the objective lens group (i.e. the object distance moves from infinity to 3 meters), the imaging surface of the scene moves along the optical axis, so that the image plane of the LCD display and the imaging surface of the scene are offset (i.e. not coincident, there is a deviation Δ, see Figure 1 indicated), resulting in blurred viewing of the scene.

[0003] In order to solve the above technical problems, the applicant filed a utility model patent application on April 15, 2024, with the patent number CN202420780505 and the patent name of a monocular telescopic laser range finder with a new focusing function, the patent increases an inner focusing mirror between the objective lens group and the light splitting prism group, the inner focusing mirror can move left and right along the optical axis L to make the scenes of different distances be imaged on the LCD display, the inner focusing mirror is driven by a driving mechanism, but the driving mechanism is adjusted manually, which has the following shortcomings: 1) not only the movement of the eyepiece group is adjusted to enable people with different vision to clearly watch the data displayed on the LCD display, but also the inner focusing mirror is manually adjusted to move left and right along the optical axis L to make the scenes of different distances be imaged on the LCD display, which is complicated and not convenient; 2) the adjustment precision is poor and the adjustment time is long; 3) it cannot quickly realize synchronous display, i.e. the object distance data displayed by the LCD display and the clear imaging of the scene cannot be synchronized. SUMMARY

[0004] The utility model discloses a range finder of the image of different distance scenes synchronously on the focal plane of ocular lens, solve the object distance data of range finder LCD display and the imaging surface of scene in prior art can not be synchronously displayed on the image plane of LCD display, and the technical problem of poor adjustment accuracy, long adjustment time and complicated adjustment is solved.

[0005] The technical scheme of the utility model is as follows:

[0006] The range finder of the image of different distance scenes synchronously on the focal plane of ocular lens, including telescopic optical system and laser ranging module, wherein telescopic optical system includes objective lens group, image plane synchronous mirror, reverse image prism group, LCD display and ocular lens group arranged in order from scene side to eye side along optical axis L, objective lens group, image plane synchronous mirror, reverse image prism group, LCD display and ocular lens group are installed in a lens barrel shell, ocular lens group moves left and right along optical axis L by manual adjustment to adjust the distance between ocular lens group and LCD display, so that people with different eyesight can clearly watch the data displayed on LCD display, image plane synchronous mirror is added between objective lens group and reverse image prism group, image plane synchronous mirror can move left and right along optical axis L to make the imaging of scenes of different distances on the image plane of LCD display, and laser ranging module sends the distance data of scene measured to LCD display for display, and the range finder is characterized in that:

[0007] Image plane synchronous mirror is driven by high-speed synchronous driving mechanism, high-speed synchronous driving mechanism includes stepping motor, motor driving circuit and single-chip microcomputer MCU, the distance data of scene measured by laser ranging module is also synchronously transmitted to single-chip microcomputer MCU for processing, single-chip microcomputer MCU converts the distance data of scene into position data of image plane synchronous mirror and outputs signal, and stepping motor is driven to quickly move image plane synchronous mirror to reach predetermined position, so that scenes are imaged on the image plane of LCD display and the distance data of scene displayed on LCD display are synchronously displayed.

[0008] The above-mentioned image plane synchronous mirror is installed on a lens support, guide grooves are arranged on the both sides of the lens support, guide rails are installed in the guide grooves, a sliding block is installed on the outside of the lens support, a threaded hole is arranged in the middle of the sliding block, a lead screw is threadedly connected in the threaded hole in the middle of the sliding block, and the stepping motor drives the lead screw to rotate, thereby driving the sliding block and the image plane synchronous mirror to move left and right along the optical axis L.

[0009] The outside of the above-mentioned lens support further protrudes a position positioning plate, the position positioning plate cooperates with a position sensor to know the position data of the image plane synchronous mirror, the position sensor sends the position data of the image plane synchronous mirror to the single-chip microcomputer MCU, and the position sensor is installed on a PCB.

[0010] The button is arranged on the lens barrel shell, and pressing the button can start the laser ranging module to measure the distance data of the scene and synchronously transmit the distance data of the scene to the LCD display and the single-chip microcomputer MCU.

[0011] Compared with the prior art, the utility model has the following advantages: the laser ranging module of the utility model synchronously transmits the measured distance data of the scene to the single-chip microcomputer MCU for processing, the single-chip microcomputer MCU converts the position data of the image plane synchronous mirror using the distance data of the scene and outputs a signal, and a stepping motor is quickly and synchronously driven to move the image plane synchronous mirror to a predetermined position, so that the scene is imaged on the image plane of the LCD display and is synchronously displayed with the distance data of the scene displayed on the LCD display. The image plane synchronous mirror can be moved to the predetermined position using the driving stepping motor in about 0.2-1.2 milliseconds, which is fast, accurate, simple and reliable.

[0012] Other advantages of the utility model are described in detail in the embodiment part. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 The figure is a light path diagram of a telescopic optical system of a range finder of the prior art;

[0014] Figure 2 The figure is a principle diagram of a range finder of the utility model;

[0015] Figure 3 The figure is a principle diagram of a range finder of the utility model; Figure 2 The figure is an A-A sectional view of the utility model;

[0016] Figure 4 The figure is a B-B sectional view of the utility model; Figure 3 The figure is a B-B sectional view of the utility model;

[0017] Figure 5 The figure is a circuit block diagram of the utility model;

[0018] Figure 6 The figure is a dotting diagram of the distance data of the scene and the position data of the image plane synchronous mirror. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be described clearly and completely below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0020] Embodiment one:

[0021] For example, Figures 2 to 5As shown, the embodiment provides a range finder with the image of different distance scenes synchronized on the eyepiece focal plane, which comprises a telescopic optical system and a laser ranging module, wherein the telescopic optical system comprises, in sequence from the scene side to the eye side along the optical axis L, an objective lens group 1, an image plane synchronization mirror 2, an inverted image prism group 3, an LCD display 4 and an eyepiece group 5, the objective lens group 1, the image plane synchronization mirror 2, the inverted image prism group 3, the LCD display 4 and the eyepiece group 5 are installed in a lens barrel housing, the eyepiece group 5 is moved left and right along the optical axis L by manual adjustment to adjust the distance between the eyepiece group 5 and the LCD display 4, so that people with different vision can clearly see the data displayed on the LCD display 4, the image plane synchronization mirror 2 is added between the objective lens group 1 and the inverted image prism group 3, and the image plane synchronization mirror 2 can be moved left and right along the optical axis L to make different distance scenes form images on the image plane of the LCD display 4, and the laser ranging module sends the measured scene distance data (i.e. object distance data) to the LCD display 4 for display; the laser ranging module comprises a transmitting part and a receiving part, the transmitting part comprises a transmitting tube 61 and a transmitting lens 62, the receiving part comprises a receiving lens 63 and a receiving sensor 64, and the image plane synchronization mirror is driven by a high-speed synchronous driving mechanism, the high-speed synchronous driving mechanism comprises a stepping motor 25, a motor driving circuit and a single-chip microcomputer MCU, the laser ranging module also synchronously transmits the measured scene distance data to the single-chip microcomputer MCU for processing, the single-chip microcomputer MCU converts the scene distance data into position data of the image plane synchronization mirror and outputs a signal, the stepping motor 25 is driven to quickly move the image plane synchronization mirror 2 to a predetermined position, so that the scene forms an image on the image plane of the LCD display 4 and is synchronously displayed with the scene distance data displayed on the LCD display 4.

[0022] The image plane synchronization mirror is driven by a high-speed synchronous driving mechanism, the high-speed synchronous driving mechanism comprises a stepping motor 25, a motor driving circuit and a single-chip microcomputer MCU, the laser ranging module also synchronously transmits the measured scene distance data to the single-chip microcomputer MCU for processing, the single-chip microcomputer MCU converts the scene distance data into position data of the image plane synchronization mirror and outputs a signal, the stepping motor 25 is driven to quickly move the image plane synchronization mirror 2 to a predetermined position, so that the scene forms an image on the image plane of the LCD display 4 and is synchronously displayed with the scene distance data displayed on the LCD display 4.

[0023] The image plane synchronization mirror is driven by a high-speed synchronous driving mechanism, the high-speed synchronous driving mechanism comprises a stepping motor 25, a motor driving circuit and a single-chip microcomputer MCU, the laser ranging module also synchronously transmits the measured scene distance data to the single-chip microcomputer MCU for processing, the single-chip microcomputer MCU converts the scene distance data into position data of the image plane synchronization mirror and outputs a signal, the stepping motor 25 is driven to quickly move the image plane synchronization mirror 2 to a predetermined position, so that the scene forms an image on the image plane of the LCD display 4 and is synchronously displayed with the scene distance data displayed on the LCD display 4.

[0024] The MCU stores a table of correlated scene distance data and image plane synchronous mirror position data. When the laser ranging module synchronously transmits the measured scene distance data to the MCU, the MCU uses the table lookup method to obtain the image plane synchronous mirror position data. The scene distance data and image plane synchronous mirror position data in the table are in one-to-one correspondence, as shown in Table 1. Table 1 measures the position data of the image plane synchronous mirror corresponding to each 0.5m increase in the scene distance starting from 3m, forming a table without the need for complex calculation and feedback. The MCU uses the table lookup method to quickly obtain the image plane synchronous mirror position data, further saving the calculation resources of the MCU, allowing the use of low-end MCUs to meet the requirements and reduce manufacturing costs.

[0025]

[0026] Because there are too many measurement data in Table 1, the work is tedious and occupies too much storage resource, and the MCU table lookup may waste too much time. To improve this, the MCU stores a table of correlated scene distance data and image plane synchronous mirror position data. The table only contains a few sets (10 sets of data in Table 2) of correlated scene distance data and image plane synchronous mirror position data. When the laser ranging module measures scene distance data that is not in the table, it is converted into the corresponding image plane synchronous mirror position data through interpolation, as shown in Table 2.

[0027]

[0028] The above 10 sets of data are plotted in the graph to obtain the curve Figure 6 The vertical coordinate in the graph is the image plane synchronous mirror position data, represented by Y, and the horizontal coordinate is the scene distance data, represented by X. Assuming that the coordinates of two adjacent points are (X1, Y1) and (X2, Y2), and the scene distance data of a certain point is X0 and X0 is between X1 and X2, the corresponding image plane synchronous mirror position data can be obtained through linear interpolation:

[0029] Y0 = Y1 + [(X0 - X1) / (X2 - X1)] * (Y2 - Y1).

[0030] The above interpolation method can ensure that the number of data in the table of correlated scene distance data and image plane synchronous mirror position data is not too large, saving the amount of stored data and obtaining the scene distance data and image plane synchronous mirror position data through simple interpolation operations, which is simple and convenient.

[0031] The above-mentioned contrast table comprises a plurality of sets of correlated scene distance data and image plane synchronous mirror position data, and the position data of the image plane synchronous mirror is obtained at different scene position points, the interval between adjacent two points among the different scene position points is uneven, the interval between adjacent two points is smaller when closer to the objective lens group, the interval between adjacent two points is larger when farther away from the objective lens group, and the data sampling points satisfy Figure 6 The curve changes to improve the accuracy of the interpolation calculation.

[0032] The above-mentioned single-chip microcomputer MCU stores a contrast table of correlated scene distance data and image plane synchronous mirror position data, and the contrast table is obtained when the telescopic optical system is designed, that is, the corresponding data is obtained by computer simulation when the telescopic optical system is designed by professional optical design software.

[0033] The above-mentioned image plane synchronous mirror 2 is installed on a lens holder 21, guide grooves 211 are arranged on both sides of the lens holder 21, guide rails 22 are installed in the guide grooves 211, sliding blocks 23 are installed on the outer side of the lens holder 21, threaded holes are arranged in the middle of the sliding blocks 23, lead screws 24 are threadedly connected in the threaded holes in the middle of the sliding blocks 23, and stepping motors 25 drive the lead screws to rotate, thereby driving the sliding blocks 23 and the image plane synchronous mirror 2 to move left and right along the optical axis L, the structure is simple, the stability of movement is good, and the accuracy is high.

[0034] The above-mentioned lens holder 1 further protrudes a position positioning plate 26, the positioning plate 26 cooperates with a position sensor 71 to obtain the position data of the image plane synchronous mirror 2, the position sensor 71 sends the position data of the image plane synchronous mirror 2 to the single-chip microcomputer MCU, the position sensor 71 is installed on a PCB board 72, the positioning plate 26 cooperates with the position sensor 71 to obtain the position data of the image plane synchronous mirror 2, which can be well fed back to the single-chip microcomputer MCU, so that the single-chip microcomputer MCU can grasp the position of the image plane synchronous mirror 2 at any time.

[0035] The above-mentioned lens barrel shell is provided with a button, and the button is pressed to start the laser ranging module to measure the scene distance data, and the scene distance data is synchronously transmitted to the LCD display and the single-chip microcomputer MCU, and the operation is simple and convenient.

[0036] The above-mentioned embodiment is a preferred embodiment of the present application, but the embodiment of the present application is not limited thereto, and any change, modification, replacement, combination, simplification made without departing from the spirit and principle of the present application is an equivalent replacement mode, and is included in the protection scope of the present application.

Claims

1. A rangefinder for synchronizing images of different distance objects on the focal plane of the eyepiece, comprising a telescopic optical system and a laser ranging module, wherein the telescopic optical system comprises, in order from the object side to the eye side along the optical axis L, an objective lens group (1), an image plane synchronizing mirror (2), an inverting prism group (3), an LCD display (4), and an eyepiece group (5), the objective lens group (1), the image plane synchronizing mirror (2), the inverting prism group (3), the LCD display (4), and the eyepiece group (5) are installed in a lens barrel housing, the eyepiece group (5) is moved left and right along the optical axis L by manual adjustment to adjust the distance between the eyepiece group (5) and the LCD display (4), so that people with different vision can clearly see the data displayed on the LCD display (4), the image plane synchronizing mirror (2) is added between the objective lens group (1) and the inverting prism group (3), the image plane synchronizing mirror (2) can be moved left and right along the optical axis L to make different distance objects form images on the image plane of the LCD display (4), and the laser ranging module sends the measured distance data of the object to the LCD display (4) for display; characterized in that: the image plane synchronizing mirror (2) is driven by a high-speed synchronous driving mechanism, the high-speed synchronous driving mechanism comprises a stepper motor (25), a motor driving circuit, and a single-chip microcomputer MCU, the measured distance data of the object is also synchronously transmitted to the single-chip microcomputer MCU for processing, the single-chip microcomputer MCU converts the distance data of the object into position data of the image plane synchronizing mirror (2) and outputs a signal, the stepper motor (25) is driven to quickly move the image plane synchronizing mirror (2) to a predetermined position, so that the object forms an image on the image plane of the LCD display (4) and is synchronously displayed with the distance data of the object displayed on the LCD display (4). The image plane synchronizing mirror (2) is installed on a lens holder (21), guide grooves (211) are arranged on both sides of the lens holder (21), guide rails (22) are installed in the guide grooves (211), a sliding block (23) is installed on the outside of the lens holder (21), a threaded hole is arranged in the middle of the sliding block (23), a lead screw (24) is threadedly connected to the threaded hole in the middle of the sliding block (23), and the stepper motor (25) drives the lead screw (24) to rotate, thereby driving the sliding block (23) and the image plane synchronizing mirror (2) to move left and right along the optical axis L.

2. The rangefinder of claim 1, wherein: A position positioning plate (26) is further protruded on the outside of the lens holder (21), the positioning plate (26) cooperates with a position sensor (71) to obtain position data of the image plane synchronizing mirror (2), the position sensor (71) sends the position data of the image plane synchronizing mirror (2) to the single-chip microcomputer MCU, and the position sensor (71) is installed on a PCB (72).

3. The rangefinder of claim 2, wherein: A button is arranged on the lens barrel housing, and pressing the button can start the laser ranging module to measure the distance data of the object and synchronously transmit the distance data of the object to the LCD display and the single-chip microcomputer MCU.

4. The rangefinder of claim 3, wherein: ​

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