Miniature monocular laser rangefinder

Abstract

SOLUTION: The present invention discloses a downsized monocular telephoto laser ranging meter, which includes: a transmission / reception lens group; a focus adjustment negative lens; a spectroscopic prism group; an eyepiece lens group; and a laser range measurement unit. The transmission / reception lens group, a focus adjustment negative lens, spectroscopic prism group and eyepiece lens group are lined in order from left to right. The transmission / reception lens group includes: an objective lens; and an emission lens, in which a dent groove is opened on one side of the objective lens, and the emission lens is fitted into the dent groove. The laser range measurement unit is used for emitting a laser, receiving a return path laser of the laser emitted by the emission lens, and calculating a distance.EFFECT: To simultaneously satisfy laser emission and reception via a transmission / reception lens group and achieve monocular design and downsizing.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to the field of laser technology, and more specifically to a miniaturized monocular telescopic laser rangefinder.

Background Art

[0002] Laser rangefinders mainly include pulsed laser rangefinders, phase-type laser rangefinders, and triangulation laser rangefinders. The most common type of pulsed laser rangefinder is the telescopic laser rangefinder, which includes a telescope and a laser transceiver module. In the process of pulsed laser distance measurement, the laser emitted by the rangefinder is reflected by the object to be measured and then received by the rangefinder. The rangefinder simultaneously records the round-trip time of the laser, and half of the product of the speed of light and the round-trip time is the distance between the rangefinder and the object to be measured. This distance information is received and read by the observer on the focal plane of the eyepiece.

[0003] Currently, most commercially available telescopic rangefinders have a binocular or trinocular structure as the mainstream in order to simultaneously achieve the effects of telescoping and distance measurement. Such a design tends to be relatively large in volume, difficult to carry, and some other rangefinders sacrifice a certain distance measurement ability in order to achieve miniaturization by making the lens as small as possible.

[0004] Therefore, how to provide a miniaturized monocular telescope has become an urgent technical problem to be solved by those skilled in the art.

Summary of the Invention

Problems to be Solved by the Invention

[0005] In view of the problems of the above-mentioned prior art, an object of the present invention is to provide a miniaturized monocular telescope that shares one eye for telescoping, transmitting, and receiving systems, reduces the volume, and realizes miniaturization.

Means for Solving the Problems

[0006] To achieve the above object, the present invention adopts the following technical solutions.

[0007] This miniaturized monocular telescope includes a transmitting and receiving lens group, a focus adjustment negative lens, a spectroscopic prism group, an eyepiece lens group, and a laser distance measurement unit. The transmitting and receiving lens group, the focus adjustment negative lens, the spectroscopic prism group, and the eyepiece lens group are arranged in order from left to right. The transmitting and receiving lens group includes an objective lens and a transmitting lens. A concave groove is formed on one side of the objective lens, and the transmitting lens is fitted into the concave groove. The laser distance measurement unit emits a laser and receives the return laser of the laser emitted by the transmitting lens, and is used to calculate the distance.

[0008] Furthermore, the laser distance measurement unit includes a laser emitting diode and a laser receiver. The laser emitting diode is used to emit a laser through the transmitting lens to the outside. The laser passes through the object and then returns, and passes through the objective lens, the focus adjustment negative lens, and the spectroscopic prism group in sequence to obtain the return laser. The laser receiver is used to receive the return laser spectroscopically by the spectroscopic prism group.

[0009] Furthermore, the laser distance measurement unit further includes a display device. The display device is electrically connected to the laser receiver and is used to display the distance from the object to be measured.

[0010] Furthermore, the laser distance measurement unit further includes a filter. The filter is installed at the receiving end of the laser receiver and is used to transmit the light in the wavelength range emitted by the laser emitter.

[0011] Furthermore, the light-splitting prism group includes a roof-type half-penta prism, an isosceles prism, and a compensation prism, wherein the roof-type half-penta prism is used to receive the return laser and object visible light and fold the optical paths of the return laser and object visible light, the isosceles prism is used to fold the optical paths of the return laser and object visible light and output the object visible light, and the compensation prism is used to output the return laser.

[0012] Furthermore, the roof-type half pentaprism includes a light input surface, a reflecting and output surface, and a roof surface, and the return laser and object visible light are input from the light input surface and output to the isosceles prism by the reflecting and output surface via reflection from the reflecting and output surface and the roof surface.

[0013] the isosceles prism further includes a light input and reflecting surface, a light output and reflecting surface, and a spectroscopic surface, the return laser and object visible light are input from the light input and reflecting surface and reflected by the light output and reflecting surface onto the spectroscopic surface, the spectroscopic surface is used to output the laser to the compensation prism and to reflect the object visible light onto the light input and reflecting surface, and output it to the eyepiece lens group via the light output and reflecting surface, the compensation prism includes a second dispersing surface and a light output surface, the return laser is input through the second dispersing surface and output to a laser receiver through the light output surface, the spectral surface of the compensation prism is adhesively connected to the spectral surface of the isosceles prism; The light receiving surface of the roof-type half-penta prism is parallel to the light output surface of the isosceles prism.

[0014] Furthermore, the eyepiece group includes a positive eyepiece lens and a cemented eyepiece lens, and the object visible light passes through the positive eyepiece lens and the cemented eyepiece lens in this order. [Effects of the Invention]

[0015] As can be seen from the above technical solution, compared with the prior art, the present invention discloses and provides a miniaturized monocular telescopic laser rangefinder, which constitutes a transmitting system with a laser emitting diode and a transmitting lens, and constitutes a receiving system with a laser receiver, an objective lens, a focus-adjusting negative lens and a spectroscopic prism group. The objective lens, the focus-adjusting negative lens, the spectroscopic prism group and the eyepiece lens group constitute a telescopic system. A U-shaped concave groove is opened and processed in the objective lens for placing the transmitting lens. The combination design of a bonding prism and a roof-type half pentaprism, which are combined by an isosceles prism and a compensating prism, enables the laser receiving system and the telescopic system to share the objective lens. Furthermore, a single eye is shared by the telescopic, transmitting and receiving systems, reducing the system volume, making the rangefinder smaller and lighter, and realizing the miniaturization of the rangefinder. In addition, a focus-adjusting negative lens is inserted between the objective lens and the spectroscopic prism group to shorten the length of the objective lens, reduce the volume, make the rangefinder smaller and lighter, and realize the miniaturization of the rangefinder.

Brief Description of the Drawings

[0016] To more clearly explain the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. Those skilled in the art can obtain other drawings based on the provided drawings without creative efforts.

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Best Mode for Carrying Out the Invention

[0017] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0018] Embodiments of the present invention disclose a miniaturized monocular laser rangefinder, which includes a transmitting and receiving lens group, a focus-adjusting negative lens 2, a spectroscopic prism group, an eyepiece lens group, and a laser distance measurement unit. The transmitting and receiving lens group, the focus-adjusting negative lens 2, the spectroscopic prism group, and the eyepiece lens group are arranged in sequence from left to right. The transmitting and receiving lens group includes an objective lens 1 and a transmitting lens 8. A concave groove is opened on one side of the objective lens 1, and the transmitting lens 8 is fitted into the concave groove. The laser distance measurement unit is used to emit a laser and receive the return laser of the laser emitted by the transmitting lens 8 to calculate the distance.

[0019] The main purpose of the spectroscopic prism group is to fold the optical path, reduce the volume, and through the spectroscopic film, realize that the telescopic system and the receiving (or transmitting) system share the objective lens, so as to reduce the distance measurement volume.

[0020] In one embodiment, the laser distance measurement unit includes a laser emitting diode 9 and a laser receiver 10. The laser emitting diode 9 is used to emit a laser outward through the transmitting lens. The laser passes through the object and then returns, and sequentially passes through the objective lens 1, the focus-adjusting negative lens 2, and the spectroscopic prism group. The laser receiver 10 is used to receive the laser spectroscopically split by the spectroscopic prism group.

[0021] As shown in Fig. 2, the emission lens 8 is fitted into the U-shaped groove of the objective lens 1, and the laser emission diode 99 emits a laser. After passing through the emission lens 8 fitted into the U-shaped groove of the objective lens 1, it is emitted, thus constituting the emission system of the distance meter.

[0022] As shown in Fig. 3, when the lens forms an image, the optical path is shown in Fig. 3A. When the lower end of the lens is blocked, the optical path is shown in Fig. 3B. As can be understood based on the imaging principle of the off-axis light beam and the on-axis light beam, as long as the blocked part does not exceed the optical axis position, it will not affect the normal and complete imaging. Since the light rays passing through the original blocked part are missing, finally the brightness of the image becomes weak. The inventor's design of the monocular distance meter can meet the normal telephoto function as long as it can ensure that after the objective lens adopts the U-shaped groove design, the telescopic system still has 50% of the brightness when the original objective lens is complete and has no vignetting.

[0023] The laser emission diode 9 emits a laser, emits it outward through the emission lens 8 in the concave groove, reflects off an obstacle, becomes a return laser, enters the interior through the objective lens 1. The focus adjustment negative lens 2 and the spectro prism group can change the optical path of the return laser, and finally it is received by the laser receiver 10, and the distance is calculated based on the laser round-trip time.

[0024] In this embodiment, the laser distance measurement unit further includes a display device 5. The display device 5 is installed between the spectro prism group and the eyepiece lens group, and the display device 5 is used to display the distance measurement result between the object to be measured.

[0025] The measurement result can be viewed simultaneously with the telephoto function, making the result observation more real-time, easy, and rapid. Here, the display device 5 is an LCD liquid crystal display screen.

[0026] In another embodiment, the laser distance measurement unit further includes a filter 11, which is installed at the receiving end of the laser receiver 10, and is used to transmit the wavelength band light emitted by the laser emitter and filter out other wavelength band light in the environment, so as to measure the accuracy of the measurement.

[0027] In another embodiment, the light separating prism group includes a roof-type half pentaprism 3, an isosceles prism 41, and a compensation prism 42; a roof-type half pentaprism 3 is used to receive the return laser and the object visible light and fold the optical paths of the return laser and the object visible light; The isosceles prism 41 is used to fold the optical paths of the return laser and the object visible light and output the object visible light. A compensation prism 42 is used to output the return laser.

[0028] As shown in FIG. 4, in another embodiment, the roof-type half pentaprism 3 includes a light input surface 310, a reflecting and output surface 311, and a roof surface 312, and the laser and object visible light are input through the light input surface 310, reflected by the reflecting and output surface 311 and the roof surface 312 in sequence, and finally output to the isosceles prism 41 by the reflecting and output surface 311.

[0029] In this embodiment, the isosceles prism 41 includes a light input and reflecting surface 410, a light output and reflecting surface 411, and a spectroscopic surface 412. The laser and the visible light from the object are input through the light input and reflecting surface 410 and reflected by the light output and reflecting surface 411 to the spectroscopic surface 412. The spectroscopic surface outputs the laser to the compensation prism 42 and reflects the visible light from the object to the light input and reflecting surface 410, and then outputs the light to the eyepiece lens group through the light output and reflecting surface 411, thereby realizing a telephoto function. The compensation prism 42 includes a second light-splitting surface 420 and a light-outputting surface 421, the laser is input from the second light-splitting surface 420 and output to the laser receiver 10 through the light-outputting surface 421, the laser receiver 10 calculates the distance to the obstacle, i.e., the object to be measured, based on the round-trip time from the laser emission to the laser reception, thereby realizing the distance measurement function; The spectroscopic surface of the compensation prism 42 is adhesively connected to the spectroscopic surface of the isosceles prism 41, The light receiving surface of the roof-shaped half pentaprism 3 is parallel to the light output surface of the isosceles prism 41.

[0030] In another embodiment, the eyepiece lens group includes an eyepiece positive lens 7 and an eyepiece cemented lens 6, The object visible light passes through the eyepiece positive lens 7 and the eyepiece cemented lens 6 in sequence.

[0031] As shown in FIG. 5, FIG. 5 is a telescopic system that realizes a telescopic function in the present invention. The light rays of visible light enter from the objective lens 1, pass through the focus adjustment lens 2, the roof-shaped half pentaprism 3 and the cemented prism 4, the display device 5, the eyepiece cemented lens 6 and the eyepiece positive lens 7. The eyepiece cemented lens consists of one concave lens and one convex lens.

[0032] As shown in FIG. 6, FIG. 6 is a receiving system that receives a return laser in the present invention. The laser reflection signal of the measured target finally passes through the objective lens cemented lens 1, the focus adjustment lens 2, the roof-shaped half pentaprism 3, the cemented prism 4, and the filter 11 and is received by the laser receiver 10.

[0033] The present invention guarantees the field brightness of the telescope, and at the same time performs U-groove treatment on the telescopic objective lens 1, incorporates the emission lens 8 into the lens of the telescopic objective lens, and the receiving system and the telescopic system share the objective lens 1 to realize the monocular design of the telescopic rangefinder. A transmissive LCD liquid crystal display is added to the focal plane of the eyepiece lens. This rangefinder has a monocular structure and can simultaneously realize the functions of telescoping, distance measurement, and display. It guarantees the distance measurement ability and at the same time ensures that the volume of the telescopic rangefinder is small enough and easy to carry.

[0034] In this specification, each embodiment is described in an accumulative manner. Each embodiment focuses on the distinction from other embodiments. For the same or similar parts between each embodiment, reference may be made to each other. Since the device disclosed in the embodiment corresponds to the method disclosed in the embodiment, it is described relatively simply, and for related parts, reference may be made to the description in the method part.

[0035] Based on the above description of the disclosed embodiments, those skilled in the art can implement or use the present invention. Various modifications to these embodiments are obvious to those skilled in the art, and the general principles defined in this specification can also be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to these embodiments shown in this specification, but should conform to the broadest scope consistent with the principles and novel features disclosed in this specification.

Description of Reference Signs

[0036] Here, 1 - objective lens, 2 - focus - adjusting negative lens, 3 - roof - type half pentaprism, 4 - combined prism, 41 - isosceles prism, 42 - compensating prism, 5 - LCD liquid crystal display unit, 6 - eyepiece lens combined lens, 7 - eyepiece lens positive lens, 8 - emission lens, 9 - laser emission diode, 10 - laser receiver, 11 - filter

Claims

1. A miniaturized monocular telescopic laser rangefinder, comprising a transmitting and receiving lens group, a focus adjusting negative lens, a spectroscopic prism group, an eyepiece lens group, and a laser distance measuring unit, wherein the transmitting and receiving lens group, the focus adjusting negative lens, the spectroscopic prism group, and the eyepiece lens group are arranged in sequence from left to right, the transmitting and receiving lens group includes an objective lens and a transmitting lens, a concave groove is formed on one side of the objective lens, and the transmitting lens is fitted into the concave groove, the laser distance measuring unit is used for emitting a laser and receiving a return laser of the laser emitted by the transmitting lens to calculate the distance. The miniaturized monocular telescopic laser rangefinder is characterized by the above.

2. The laser distance measuring unit includes a laser emitting diode and a laser receiver, the laser emitting diode is used for emitting a laser through the transmitting lens to the outside, the laser passes through an object and then returns, and sequentially passes through the objective lens, the focus adjusting negative lens, and the spectroscopic prism group to obtain the return laser, the laser receiver is used for receiving the return laser spectroscopically separated by the spectroscopic prism group. The miniaturized monocular telescopic laser rangefinder according to claim 1 is characterized by the above.

3. The laser distance measuring unit further includes a display device, and the display device is used for displaying the distance from the object to be measured. The miniaturized monocular telescopic laser rangefinder according to claim 2 is characterized by the above.

4. The laser distance measuring unit further includes a filter, and the filter is installed at the receiving end of the laser receiver and is used for transmitting light in the wavelength range emitted by the laser emitting diode. The miniaturized monocular telescopic laser rangefinder according to claim 2 is characterized by the above.

5. The spectroscopic prism group includes a roof-type half pentaprism, an isosceles prism, and a compensation prism, the roof-type half pentaprism is used for receiving the return laser and object visible light, the isosceles prism is used for outputting object visible light, the compensation prism is used for outputting the return laser. The miniaturized monocular telescopic laser rangefinder according to claim 2 is characterized by the above.

6. The roof-type half-penta prism includes a light input surface, a reflecting and output surface, and a roof surface, and the return laser and object visible light are input from the light input surface and reflected by the reflecting and output surface and the roof surface, and then output to the isosceles prism by the reflecting and output surface.

7. the isosceles prism includes a light input and reflecting surface, a light output and reflecting surface, and a spectroscopic surface, the return laser and the object visible light are input through the light input and reflecting surface and reflected by the light output and reflecting surface onto the spectroscopic surface, the spectroscopic surface is used to output the laser to the compensation prism and to reflect the object visible light onto the light input and reflecting surface, and output it to the eyepiece lens group via the light output and reflecting surface, the compensation prism includes a second dispersing surface and a light output surface, the return laser is input through the second dispersing surface and output to a laser receiver through the light output surface, the spectral surface of the compensation prism is adhesively connected to the spectral surface of the isosceles prism; 7. The miniaturized monocular telescopic laser rangefinder according to claim 6, wherein the light receiving surface of the roof-type half pentaprism is parallel to the light output surface of the isosceles prism.

8. the eyepiece group includes a positive eyepiece lens and a cemented eyepiece lens; 2. The miniature monocular telescopic laser rangefinder according to claim 1, wherein the object visible light passes through the positive eyepiece lens and the cemented eyepiece lens in this order.

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