Optical projection system and laser ranging device

Abstract

The utility model discloses an optical projection system which comprises a color screen, a lens assembly and a light guide assembly which are sequentially arranged, the color screen linearly emits light towards the direction of the light guide assembly, and the color screen, the lens assembly and an eyepiece of the light guide assembly are located on the same linear light path. The color screen, the lens assembly, the light guide assembly and the eyepiece are located on the same straight line light path, so that the optical projection system adopts a direct light path, and emergent light of the color screen is directly projected to the light guide assembly, so that the light guide assembly transmits the emergent light to an imaging surface of the eyepiece, and the emergent light is imaged to human eyes; compared with the prior art that a projection path enters through a reflection light path, optical design is simplified, a total reflection mirror and a reflection mirror support which are necessary for adopting the reflection light path are omitted, and therefore material cost is saved.

Description

Technical Field

[0001] The utility model relates to the technical field of laser ranging, in particular to an optical projection system and a laser ranging device. Background Art

[0002] A laser rangefinder is mainly an instrument for accurately measuring the distance to a target using a laser. When the laser rangefinder works, it emits a very thin laser beam towards the target, and a photoelectric element receives the laser beam reflected by the target. A timer measures the time from the emission to the reception of the laser beam, and calculates the distance from the observer to the target. However, the optical projection path of the existing laser ranging device usually uses a reflection optical path to transmit to the eyepiece imaging surface, and the reflection optical path must use a total reflection mirror and a mirror bracket, resulting in a complex internal structure and a complex optical design. Summary of the Utility Model

[0003] The technical problem to be solved by the utility model is to provide an optical projection system and a laser ranging device for the problem that the projection path of the existing laser ranging device uses a reflection optical path to transmit to the eyepiece imaging surface, and the reflection optical path must use a total reflection mirror and a mirror bracket, resulting in a complex internal structure and a complex optical design.

[0004] The technical solution adopted by the utility model to solve the above technical problems is as follows:

[0005] Provide an optical projection system, including a color screen, a lens assembly and a light guide assembly arranged in sequence. The color screen emits light linearly towards the light guide assembly, and the color screen, the lens assembly and the light guide assembly are located on the same direct light path. The lens assembly is located between the color screen and the light guide assembly, and the plane where the lens assembly is located is set at a right angle to the light emission path of the color screen. The lens group is used to align and focus the light beam emitted by the color screen and transmit it to the light guide assembly, so that the light guide assembly transmits the light emitted by the color screen to the imaging surface of the eyepiece.

[0006] Further, the light guide assembly includes a roof prism and a cemented prism assembly bonded to the roof prism.

[0007] Further, the cemented prism assembly includes a first cemented prism bonded to the roof prism and a second cemented prism corresponding to the lens assembly.

[0008] Further, the lens assembly is sequentially provided with a first lens, a second lens and a third lens along the direction of the light emission path of the color screen.

[0009] Further, the first lens, the second lens and the third lens are sequentially detachably assembled together.

[0010] According to the optical projection system of the above embodiments of the present utility model, since the color screen emits light linearly towards the light guide component, and the color screen, the lens component and the light guide component are located on the same direct light path. In this way, in this embodiment, because the optical projection system adopts a direct light path, the light emitted by the color screen is directly projected onto the light guide component, so that the light guide component can transmit it to the imaging surface of the eyepiece, and then image to the human eye. Compared with the existing technology where the projection path enters through a reflection light path, the optical design is simplified, and the total reflection mirror and the mirror bracket necessary for the reflection light path are omitted, thereby saving material costs and effectively solving the problem that the optical projection path of the existing laser ranging device uses a reflection light path to transmit to the imaging surface of the eyepiece, and the reflection light path must use a total reflection mirror and a mirror bracket, resulting in a complex internal structure and a complex optical design.

[0011] In addition, the present utility model also provides a laser ranging device, which includes the above optical projection system. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0013] Figure 1 It is a schematic diagram of an optical projection system provided by an embodiment of the present utility model.

[0014] In the figure: 106, color screen; 107, heat dissipation component; 108, light guide component; 1081, roof prism; 1082, cemented prism assembly; 10821, first cemented prism; 10822, second cemented prism; 109, lens component; 1091, first lens; 1092, second lens; 1093, third lens; 200, human eye. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0015] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model.

[0016] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0017] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0018] Please refer to Figure 1 As shown, an optical projection system provided by an embodiment of the present utility model includes a color screen 106, a lens assembly 109, and a light guide assembly 108 arranged in sequence. The color screen 106 emits light linearly in the direction of the light guide assembly 108, and the color screen 106, the lens assembly 109, and the light guide assembly 108 are located on the same direct light path. The lens assembly 109 is located between the color screen 106 and the light guide assembly 108, and the plane where the lens assembly 109 is located is perpendicular to the light emission path of the color screen 106. The lens group 109 is used to align and focus the light beam emitted by the color screen 106 and transmit it to the light guide assembly 108, so that the light guide assembly 108 transmits the light emitted by the color screen 106 to the imaging surface of the eyepiece 105. In this way, in this embodiment, since the optical projection system adopts a direct light path, the light emitted by the color screen 106 is directly projected onto the light guide assembly 109, so that the light guide assembly 109 transmits it to the imaging surface of the eyepiece 105, and then images to the human eye 200. Compared with the prior art where the projection path uses a reflection light path to enter, the optical design is simplified, and the total reflection mirror and the mirror bracket necessary for using the reflection light path are omitted, thereby saving the material cost and effectively solving the problem that the optical projection path of the existing laser ranging device uses a reflection light path to transmit to the imaging surface of the eyepiece, and the reflection light path must use a total reflection mirror and a mirror bracket, resulting in a complex internal structure and a complex optical design.

[0019] In this embodiment, the lens assembly 109 is located between the color screen 106 and the light guide assembly 108, and the plane where the lens assembly 109 is located is set at a right angle to the light output path of the color screen 106. The lens assembly 109 is used to align and focus the light output beam of the color screen 106 and transmit it to the light guide assembly 108, so that the light guide assembly 108 transmits it to the imaging surface of the eyepiece 105, and then images to the human eye 200.

[0020] In this embodiment, the light guide assembly 108 includes a roof prism 1081 and a cemented prism assembly 1082 adhesively bonded to the roof prism 1081.

[0021] In this embodiment, the cemented prism assembly 1082 includes a first cemented prism 10821 adhesively bonded to the roof prism 1081 and a second cemented prism 10822 corresponding to the lens assembly 109.

[0022] In this embodiment, the lens assembly 109 is sequentially provided with a first lens 1091, a second lens 1092, and a third lens 1093 along the direction of the light output path of the color screen 106.

[0023] In this embodiment, the first lens 1091, the second lens 1092, and the third lens 103 are sequentially assembled together, which is convenient for assembly or maintenance.

[0024] According to the optical projection system of the above embodiment of the present invention, since the color screen emits light linearly towards the light guide assembly, and the color screen, the lens assembly, and the light guide assembly eyepiece are located on the same direct light path. In this way, in this embodiment, because the optical projection system adopts a direct light path, the light output of the color screen is directly projected onto the light guide assembly, so that the light guide assembly transmits it to the imaging surface of the eyepiece, and then images to the human eye. Compared with the projection path in the prior art that enters through a reflection light path, the optical design is simplified, and the total reflection mirror and the mirror bracket necessary for the reflection light path are omitted, thereby saving the material cost and effectively solving the problem that the optical projection path of the existing laser ranging device uses a reflection light path to transmit to the imaging surface of the eyepiece, and the reflection light path must use a total reflection mirror and a mirror bracket, resulting in a complex internal structure and a complex optical design.

[0025] In addition, the present invention also provides a laser ranging device, which includes the above optical projection system.

[0026] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An optical projection system, characterized in that: It comprises a color screen, a lens assembly, and a light guide assembly which are arranged in sequence, the color screen emits light in a straight line in the direction of the light guide assembly, and the color screen, the lens assembly and the light guide assembly are located on the same straight light path, the lens assembly is located between the color screen and the light guide assembly, and the plane where the lens assembly is located is arranged at a right angle to the light output path of the color screen, and the lens group is used to align and focus the light beam output from the color screen and transmit it to the light guide assembly, so that the light guide assembly transmits the light output from the color screen to the imaging surface of the eyepiece.

2. An optical projection system according to claim 1, characterized in that: The light guide assembly includes a roof prism and a cemented prism assembly bonded to the roof prism.

3. An optical projection system as claimed in claim 2, characterized in that: The glued prism assembly includes a first glued prism bonded to the roof prism and a second glued prism corresponding to the lens assembly.

4. An optical projection system as claimed in claim 1, characterized in that: The lens assembly is provided with a first lens, a second lens and a third lens in sequence along the direction of the light exit path of the color screen.

5. An optical projection system as claimed in claim 4, characterized in that: The first lens, the second lens and the third lens are detachably assembled together in sequence.

6. A laser distance measuring device, characterized in that: Comprising the optical projection system as claimed in any one of claims 1 to 5.

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