阅读说明：本技术 光学装置及其棱镜模块 (Optical device and prism module thereof ) 是由 刘斌 刘华唐 于 2020-04-15 设计创作，主要内容包括：一种棱镜模块,包括第一棱镜、第二棱镜以及第三棱镜。该第一棱镜包括第一面、第二面、第三面以及第四面。该第二棱镜包括第五面、第六面以及第七面,其中,该第二棱镜的该第七面邻近于该第一棱镜的该第三面。该第三棱镜包括第八面、第九面以及第十面,其中,该第三棱镜的该第八面贴合于该第二棱镜的该第六面。其中,一物体所发出的第一光束通过该棱镜模块,且进入该棱镜模块前的该第一光束与离开该棱镜模块的该第一光束并非同轴。本发明更提供一种光学装置,其包括上述的棱镜模块。(A prism module includes a first prism, a second prism, and a third prism. The first prism includes a first face, a second face, a third face, and a fourth face. The second prism comprises a fifth surface, a sixth surface and a seventh surface, wherein the seventh surface of the second prism is adjacent to the third surface of the first prism. The third prism comprises an eighth surface, a ninth surface and a tenth surface, wherein the eighth surface of the third prism is attached to the sixth surface of the second prism. The first light beam emitted by an object passes through the prism module, and the first light beam before entering the prism module is not coaxial with the first light beam leaving the prism module. The invention further provides an optical device comprising the prism module.)

1. A prism module, comprising:

the first prism comprises a first surface, a second surface, a third surface and a fourth surface, wherein the first surface, the third surface, the second surface and the fourth surface are sequentially adjacent to each other, the first surface is opposite to the second surface, and the third surface is opposite to the fourth surface;

a second prism comprising a fifth surface, a sixth surface and a seventh surface, wherein the fifth surface is adjacent to the sixth surface and the seventh surface, respectively, and the seventh surface of the second prism is adjacent to the third surface of the first prism; and

a third prism comprising an eighth surface, a ninth surface and a tenth surface, wherein the eighth surface is adjacent to the ninth surface and the tenth surface, respectively, wherein the eighth surface of the third prism faces the sixth surface of the second prism;

a first film disposed between the third surface and the seventh surface; and

the first light beam emitted by an object enters the first prism from the first surface, is reflected by the fourth surface, sequentially enters the second prism through the third surface and the seventh surface, is reflected by the fifth surface, leaves the second prism from the sixth surface, enters the third prism from the eighth surface, sequentially reflects by the ninth surface and the tenth surface, and passes through the eighth surface to leave the third prism, wherein the first light beam passes through the first film and faces the seventh surface.

2. The prism module of claim 1, wherein the first prism is a diamond prism; wherein the first film is formed on the third surface of the first prism.

3. An optical device, comprising:

an objective lens group;

the prism module of claim 1; and

an eyepiece group;

the prism module is arranged between the objective lens group and the ocular lens group, the first light beam sequentially passes through the objective lens group, the prism module and the ocular lens group, and the central axis of the objective lens group is parallel to the central axis of the ocular lens group and does not overlap.

4. An optical device, comprising:

an objective lens group;

a prism module, comprising:

a first prism including a first surface, a second surface, a third surface, and a fourth surface;

the second prism comprises a fifth surface, a sixth surface and a seventh surface, wherein the seventh surface of the second prism is adjacent to the third surface of the first prism;

a third prism comprising an eighth face, a ninth face, and a tenth face, wherein the eighth face of the third prism faces the sixth face of the second prism;

a first film disposed between the third surface and the seventh surface; and

a first light beam emitted by an object enters the first prism from the first surface, is reflected by the fourth surface, sequentially enters the second prism through the third surface and the seventh surface, is reflected by the fifth surface, leaves the second prism from the sixth surface, enters the third prism from the eighth surface, sequentially reflects by the ninth surface and the tenth surface, and passes through the eighth surface to leave the third prism, wherein the first light beam passes through the first film and faces the seventh surface; and

an eyepiece group;

the prism module is arranged between the objective lens group and the ocular lens group, the first light beam sequentially passes through the objective lens group, the prism module and the ocular lens group, and the central axis of the objective lens group is parallel to the central axis of the ocular lens group and does not overlap.

5. The optical apparatus according to claim 3 or 4, further comprising a display unit disposed at a side of the sixth surface of the second prism and configured to emit a second light beam, wherein the second light beam enters the second prism from the sixth surface, is sequentially reflected by the seventh surface and the fifth surface, passes through the sixth surface again to leave the second prism, enters the third prism from the eighth surface, is sequentially reflected by the ninth surface and the tenth surface, passes through the eighth surface again to leave the third prism, and passes through the eyepiece group.

6. The optical device of claim 5, wherein the first film is configured to reflect the second light beam and pass the first light beam through the first film.

7. The optical device according to claim 3 or 4, further comprising a light emitter and a light receiver, wherein the light emitter is configured to emit a third light beam, and the light receiver is configured to receive the third light beam reflected by the object to calculate a distance between the object and the optical device, wherein the first film is formed on the third surface of the first prism and configured to reflect the third light beam and pass the first light beam through the first film.

8. The optical device of claim 7, wherein the light emitter is disposed on a side of the second surface of the first prism, and the third light beam enters the first prism from the second surface, is sequentially reflected by the third surface and the fourth surface, exits the first prism from the first surface, passes through the objective lens group, exits the optical device to the object, is reflected by the object and returns to the optical device, and is received by the light receiver.

9. The optical device of claim 7, wherein the light receiver is disposed on a side of the second surface of the first prism, and the third light beam passes through the objective lens group, exits the optical device to the object, is reflected by the object and returns to the optical device, passes through the objective lens group again, enters the first prism from the first surface, is reflected by the fourth surface and the third surface in sequence, exits the first prism from the second surface, and is received by the light receiver.

10. The optical device of claim 5, further comprising a light emitter and a light receiver, wherein the light emitter is configured to emit a third light beam and the light receiver is configured to receive the third light beam reflected by the object to calculate a distance between the object and the optical device, and wherein the first film is configured to reflect the second light beam and the third light beam and pass the first light beam through the first film.

Technical Field

The present invention relates to an optical device and a prism module thereof, and more particularly, to a laser range finder and a prism module thereof.

Background

Referring to fig. 1, a conventional range finder 10 includes an objective lens set (not shown), a prism module 11, an organic light emitting diode 12, a light emitter 13, a light receiver (not shown), and an eyepiece lens set (not shown). The prism module 11 is disposed between the objective lens group and the eyepiece lens group, and includes a first prism 14, a second prism 15, and a third prism 16, wherein the first prism 14 is attached to the second prism 15, and the third prism 16 is adjacent to the second prism 15. The organic light emitting diode 12 and the light emitter 13 are disposed on a side close to the first prism 14. The third prism 16 is a roof prism, and the second prism 15 and the third prism 16 form a Pechan prism group.

In operation, a first light beam a emitted from an object (not shown) sequentially passes through the objective lens group, the second prism 15, the third prism 16 and the eyepiece lens group, so that a user can view an image of the object. The second light beam B emitted by the organic light emitting diode 12 is reflected by the reflector 17 and sequentially passes through the first prism 14, the second prism 15, the third prism 16 and the eyepiece set, so that a user can view image information and a reticle generated by the organic light emitting diode 12. The third light beam C emitted by the light emitter 13 reaches the object through another reflector 18, the first prism 14, the second prism 15 and the objective lens group, and is reflected by the object back to the light receiver, so as to calculate the distance between the object and the distance meter 10.

In the above structure, the roof prism (i.e. the third prism 16) and the keyshan prism group (composed of the second prism 15 and the third prism 16) in the prism module 11 often have a problem of light leakage, which affects the manufacturing cost and the imaging quality of the distance meter 10 carrying the prism module 11. If the objective lens group and the eyepiece lens group of the distance measuring apparatus 10 are not coaxial, the prism module 11 has a larger volume, which results in a larger volume of the distance measuring apparatus 10 carrying the prism module 11. The second light beam B is reflected for a greater number of times when passing through the prism module 11, so that the brightness of the image generated by the organic light emitting diode 12 is reduced. In addition, the effective diameter of the third light beam C emitted by the light emitter 13 and the effective diameter of the second light beam B emitted by the organic light emitting diode 12 interfere with each other, resulting in the energy of the third light beam C emitted by the light emitter 13 being reduced.

Disclosure of Invention

The present invention is directed to an optical device, which uses a prism module with a novel structure to reduce the size and improve the image quality, and simultaneously ensures that the brightness of the image generated by the display unit and the energy of the light beam emitted by the light emitter are sufficiently high.

The prism module of one embodiment of the present invention includes a first prism, a second prism, a third prism, and a first film. The first prism comprises a first surface, a second surface, a third surface and a fourth surface, wherein the first surface, the third surface, the second surface and the fourth surface are adjacent in sequence, the first surface is opposite to the second surface, and the third surface is opposite to the fourth surface. The second prism comprises a fifth surface, a sixth surface and a seventh surface, wherein the fifth surface is respectively adjacent to the sixth surface and the seventh surface, and the seventh surface of the second prism is adjacent to the third surface of the first prism. The third prism comprises an eighth surface, a ninth surface and a tenth surface, wherein the eighth surface is respectively adjacent to the ninth surface and the tenth surface, and the eighth surface of the third prism faces the sixth surface of the second prism. The first light beam emitted by an object enters the first prism from the first surface, is reflected by the fourth surface, sequentially enters the second prism through the third surface and the seventh surface, is reflected by the fifth surface, leaves the second prism from the sixth surface, enters the third prism from the eighth surface, sequentially reflects by the ninth surface and the tenth surface, and passes through the eighth surface to leave the third prism, wherein the first light beam passes through the first film and faces the seventh surface.

In another embodiment, the first prism is a rhombus prism; wherein the first film is formed on the third surface of the first prism.

The optical device of one embodiment of the present invention includes an objective lens group, the prism module and an eyepiece lens group. The prism module is arranged between the objective lens group and the ocular lens group, the first light beam sequentially passes through the objective lens group, the prism module and the ocular lens group, and the central axis of the objective lens group is parallel to the central axis of the ocular lens group and does not overlap.

In another embodiment, the optical device includes an objective lens group, a prism module, and an eyepiece lens group. The prism module includes a first prism, a second prism, a third prism, and a first film. The first prism includes a first face, a second face, a third face, and a fourth face. The second prism comprises a fifth surface, a sixth surface and a seventh surface, wherein the seventh surface of the second prism is adjacent to the third surface of the first prism. The third prism includes an eighth face, a ninth face, and a tenth face, wherein the eighth face of the third prism faces the sixth face of the second prism. The first film is arranged between the third surface and the seventh surface. The first light beam emitted by an object enters the first prism from the first surface, is reflected by the fourth surface, sequentially enters the second prism through the third surface and the seventh surface, is reflected by the fifth surface, leaves the second prism from the sixth surface, enters the third prism from the eighth surface, sequentially reflects by the ninth surface and the tenth surface, and passes through the eighth surface to leave the third prism, wherein the first light beam passes through the first film and faces the seventh surface. The prism module is arranged between the objective lens group and the ocular lens group, the first light beam sequentially passes through the objective lens group, the prism module and the ocular lens group, and the central axis of the objective lens group is parallel to the central axis of the ocular lens group without overlapping.

In another embodiment, the optical device further includes a display unit disposed on one side of the sixth surface of the second prism and configured to emit a second light beam, wherein the second light beam enters the second prism from the sixth surface, is sequentially reflected by the seventh surface and the fifth surface, passes through the sixth surface again to leave the second prism, enters the third prism from the eighth surface, is sequentially reflected by the ninth surface and the tenth surface, passes through the eighth surface again to leave the third prism, and passes through the eyepiece group.

In another embodiment, the first film is configured to reflect the second light beam and pass the first light beam through the first film.

In another embodiment, the optical device further comprises a light emitter and a light receiver, wherein the light emitter is used for emitting a third light beam, and the light receiver is used for receiving the third light beam reflected by the object so as to calculate the distance between the object and the optical device. The first film is formed on the third surface of the first prism and used for reflecting the third light beam and enabling the first light beam to pass through the first film.

In another embodiment, the light emitter is disposed on a side of the second surface of the first prism, and the third light beam enters the first prism from the second surface, is reflected by the third surface and the fourth surface in sequence, exits the first prism from the first surface, passes through the objective lens group, exits the optical device to reach the object, is reflected by the object and returns to the optical device, and is received by the light receiver.

In another embodiment, the light receiver is disposed at a side of the second surface of the first prism, and the third light beam passes through the objective lens group, exits the optical device to reach the object, is reflected by the object and returns to the optical device, passes through the objective lens group again, enters the first prism from the first surface, is reflected by the fourth surface and the third surface in sequence, exits the first prism from the second surface, and is received by the light receiver.

In another embodiment, the optical device further comprises a light emitter and a light receiver, wherein the light emitter is configured to emit a third light beam, and the light receiver is configured to receive the third light beam reflected by the object to calculate a distance between the object and the optical device, wherein the first film is configured to reflect the second light beam and the third light beam and pass the first light beam through the first film.

The optical device and the prism module thereof have the following beneficial effects: the prism module with a novel structure is used for reducing the volume and improving the imaging quality, and simultaneously, the brightness of an image generated by the display unit and the energy of a light beam emitted by the light emitter are ensured to be high enough.

Drawings

Fig. 1 is a schematic structural view of a conventional range finder.

Fig. 2A is a top view of a range finder according to a first embodiment of the present invention.

Fig. 2B is a right side view of the range finder of the first embodiment of the present invention.

FIG. 3A illustrates a schematic optical path of the first light beam in the distance measuring device of FIG. 2A.

FIG. 3B illustrates an optical path of the first light beam in the distance meter of FIG. 2B.

FIG. 4A illustrates a schematic optical path of a second light beam in the range finder of FIG. 2A.

FIG. 4B illustrates the optical path of the second beam of light in the range finder of FIG. 2B.

FIG. 5 is a schematic diagram of the optical path of the third beam of light in the range finder of FIG. 2A.

Detailed Description

The first embodiment of the optical device of the present invention is a distance measuring apparatus, which includes two optical systems, the difference between the two optical systems is that a light emitter is disposed in one of the optical systems, and a light receiver is disposed in the other optical system.

Please refer to fig. 2A and 2B, which illustrate a portion of a range finder 100 according to a first embodiment of the present invention, comprising an objective lens set 94, a prism module 20, a display unit 30, a light emitter 40, a lens unit 50, and an eyepiece lens set 92 (the components and configuration of the other portion of the range finder 100 are the same, except that the light emitter 40 is replaced by a light receiver 49). A first light beam a (see fig. 3A to 3B) emitted by an object 200 sequentially passes through the objective lens group 94, the prism module 20 and the eyepiece lens group 92, a second light beam B (see fig. 4A to 4B) emitted by the display unit 30 sequentially passes through the prism module 20 and the eyepiece lens group 92, and a third light beam C (see fig. 5) emitted by the light emitter 40 sequentially passes through the prism module 20 and the objective lens group 94, reaches the object 200, is reflected by the object 200 back to the distance meter 100, and is received by the light receiver 49. With such an arrangement, the user can view the image of the object 200 and the image generated by the display unit 30 through the eyepiece set 92, and know the distance from the object 200 to the distance meter 100. The construction and operation of rangefinder 100 is described in detail below:

the prism module 20 is disposed between the objective lens group 94 and the eyepiece lens group 92, and includes a first prism 45, a second prism 24, and a third prism 34. In the first embodiment, the first prism 45 is a diamond prism and includes a first surface 41, a second surface 42, a third surface 43 and a fourth surface 44, wherein an antireflection film is formed on the first surface 41, an antireflection film for allowing the third light beam C to pass is formed on the second surface 42, a first film 81 is formed on the third surface 43, and the first film 81 is used for reflecting the second light beam B and the third light beam C and allowing the first light beam a to pass. The second prism 24 is a triangular prism or a rectangular prism and includes a fifth surface 21, a sixth surface 22, and a seventh surface 23, wherein the sixth surface 22 has an antireflection film formed thereon. As shown in fig. 2B, the third prism 34 is a triangular prism or a right-angle prism, and includes an eighth surface 31, a ninth surface 32, and a tenth surface 33, wherein the eighth surface 31 has an antireflection film formed thereon.

Specifically, the first surface 41 of the first prism 45 faces the objective lens group 94, the seventh surface 23 of the second prism 24 is adjacent to the third surface 43 of the first prism 45, the upper half of the eighth surface 31 of the third prism 34 is adjacent to the sixth surface 22 of the second prism 24, and the lower half of the eighth surface 31 of the third prism 34 faces the ocular lens group 92. Because the roof prism and the Pechan prism combination are not used in the structure, the prism module 20 of the present invention can avoid light leakage compared with the existing prism module. So configured, it is ensured that the distance meter 100 loaded with the prism module 20 is provided with lower manufacturing cost and better imaging quality. As shown in fig. 2A, the display unit 30 is disposed on one side of the sixth surface 22 of the second prism 24, the lens unit 50 is disposed between the display unit 30 and the sixth surface 22 of the second prism 24, and the light emitter 40 is disposed on one side of the second surface 42 of the first prism 45.

In the first embodiment, the display unit 30 is an Organic Light Emitting Diode (OLED) or a Liquid Crystal Display (LCD) or other displays, the first light beam a is a visible light beam, the second light beam B is an image light beam, and the third light beam C is a laser beam or an invisible light beam.

As shown in fig. 3A to 3B, when the first light beam a emitted from the object 200 enters the distance meter 100, the first light beam a passes through the objective lens group 94, enters the first prism 45 from the first surface 41, is reflected by the fourth surface 44, sequentially enters the second prism 24 through the third surface 43 and the seventh surface 23, is reflected by the fifth surface 21, and exits the second prism 24 from the sixth surface 22. The first light beam a leaving the second prism 24 enters the third prism 34 from the upper half of the eighth surface 31, is reflected by the ninth surface 32 and the tenth surface 33 in sequence, and passes through the lower half of the eighth surface 31 to leave the prism module 20. Finally, the first light beam a exiting the prism module 20 passes through the eyepiece set 92 for the user to view the image of the object 200. It should be noted that the first light beam a before entering the prism module 20 and the first light beam a after leaving the prism module 20 are not coaxial, so that the objective lens group 94 and the eyepiece lens group 92 in the distance measuring apparatus 100 can adopt a non-coaxial design without increasing the volume of the prism module 20. In other words, the central axis L1 (fig. 2A) of the objective lens assembly 94 and the central axis L2 (fig. 2B) of the eyepiece lens assembly 92 are only parallel to each other and do not overlap. With this arrangement, the eye span of rangefinder 100 (e.g., a binocular rangefinder) is reduced while having a smaller volume.

As shown in fig. 4A to 4B, the second light beam B emitted from the display unit 30 passes through the lens unit 50, enters the second prism 24 from the sixth surface 22, is sequentially reflected by the seventh surface 23 and the fifth surface 21, and passes through the sixth surface 22 again to leave the second prism 24. The second light beam B leaving the second prism 24 enters the third prism 34 from the upper half of the eighth surface 31, is reflected by the ninth surface 32 and the tenth surface 33 in sequence, and passes through the lower half of the eighth surface 31 to leave the prism module 20. Finally, the second light beam B leaving the prism module 20 passes through the eyepiece set 92 for the user to view the image generated by the display unit 30. Compared with the conventional prism module, the second light beam B is reflected less times when passing through the prism module 20, thereby preventing the brightness of the image generated by the display unit 30 from being reduced.

As shown in fig. 5, the third light beam C emitted by the light emitter 40 enters the first prism 45 from the second surface 42, is reflected by the third surface 43 and the fourth surface 44 in sequence, and exits the first prism 45 from the first surface 41. The third light beam C leaving the prism module 20 passes through the objective lens group 94 to reach the object 200. Finally, the third light beam C is reflected by the object 200 and returns to the distance meter 100, and is received by the light receiver 49 to calculate the distance between the object 200 and the distance meter 100. With the help of the prism module 20, the effective diameter of the third light beam C emitted by the light emitter 40 and the effective diameter of the second light beam B emitted by the display unit 30 are prevented from interfering with each other. The energy of the third light beam C emitted by the light emitter 40 is increased compared to the conventional prism module.

In the second embodiment, the positions of the light emitter 40 and the light receiver 49 respectively disposed in the two optical systems of the range finder 100 are interchanged. That is, the light receiver 49 is disposed on the second surface 42 side of the first prism 45. In operation, the third light beam C emitted from the light emitter 40 is reflected by the object 200, and passes through the objective lens set 94 and the prism module 20 in sequence to reach the light receiver 49. Specifically, the third light beam C passing through the objective lens group 94 enters the first prism 45 from the first surface 41, is reflected by the fourth surface 44 and the third surface 43 in this order, exits the first prism 45 from the second surface 42, and reaches the light receiver 49. The light receiver 49 receives the third light beam C reflected by the object 200, so that the distance meter can calculate the distance between the object 200 and the distance meter. The rest of the configuration and operation are similar to those of the first embodiment, and are not described herein.

In the third embodiment, the second beam path B described in fig. 4A and 4B is not used, but instead the user directly views the display unit 30 to obtain the image information. Other configurations and operations are similar to those of the first and second embodiments, and are not described herein.

Wherein the prism module 20 basically comprises the first prism 45 including a first face 41, a second face 42, a third face 43 and a fourth face 44, a second prism 24 including a fifth face 21, a sixth face 22 and a seventh face 23, wherein the seventh face 23 of the second prism 24 is adjacent to the third face 43 of the first prism 45, a third prism 34 including an eighth face 31, a ninth face 32 and a tenth face 33, wherein the eighth face 31 of the third prism 34 faces the sixth face 22 of the second prism 24, a first film 81 is disposed between the third face 43 and the seventh face 23, wherein a first light beam a emitted by an object 200 enters the first prism 45 from the first face 41, is reflected by the fourth face 44, enters the second prism 24 through the third face 43 and the seventh face 23 in order, is reflected by the fifth face 21, exits the second prism 24 from the sixth face 22, enters the third prism 34 from the eighth surface 31, is sequentially reflected by the ninth surface 32 and the tenth surface 33, and passes through the eighth surface 31 to leave the third prism 34, wherein the first film 81 allows the first light beam a to pass through toward the seventh surface 23, which is reduced in volume and improved in imaging quality by the prism module 20 of a novel structure, specifically, the seventh surface 23 of the second prism 24 is adjacent to the third surface 43 of the first prism 45, and the upper half of the eighth surface 31 of the third prism 34 is adjacent to the sixth surface 22 of the second prism 24. Because the roof prism and the Pechan prism combination are not used in the structure, the prism module 20 of the present invention can avoid light leakage compared with the existing prism module. So configured, it is ensured that the distance meter 100 loaded with the prism module 20 is provided with lower manufacturing cost and better imaging quality. Moreover, the first light beam a is reflected only four times when passing through the prism module 20, thereby preventing the brightness of the first light beam a generated by the object 200 from being reduced.