TWI730602B - Distance measuring device and prism module thereof - Google Patents

Abstract

A prism module includes a first prism, a second prism, a third prism and a fourth prism. The first prism includes a first surface. The second prism includes a third surface and a fifth surface, wherein the third surface of the second prism is adjacent to the first surface of the first prism. The third prism includes a sixth surface and a seventh surface, wherein the sixth surface of the third prism is adjacent to the fifth surface of the second prism. The fourth prism includes a ninth surface, wherein the ninth surface of the fourth prism is adjacent to the seventh surface of the third prism. A first light beam passes through the prism module, and the first light beam before entering the prism module and the first light beam after leaving the prism module are non-coaxial. The invention further provides a distance measuring device including the above-described prism module.

Description

Rangefinder and its beam module

The present invention relates to a rangefinder and its beam module, in particular to a laser rangefinder and its beam module.

Please refer to Fig. 1, a conventional rangefinder 10 includes an objective lens group (not shown), a lens module 11, a display unit 12, a light emitting unit 13, a light receiving unit (not shown), and An eyepiece set (not shown). The lens module 11 is arranged between the objective lens group and the eyepiece lens group, and includes a first lens 14, a second lens 15, and a third lens 16, wherein the first lens 14 is attached to The second ridge 15 is, and the third ridge 16 is adjacent to the second ridge 15. The display unit 12 and the light emitting unit 13 are arranged on the side close to the first frame 14.

During operation, a first light beam A emitted by an object (not shown) passes through the objective lens group, the second lens 15, the third lens 16 and the eyepiece group in order for the user to view the image of the object . A second light beam B emitted by the display unit 12 is reflected by a mirror 17, and passes through the first beam 14, the second beam 15, the third beam 16 and the eyepiece group in order for the user to view the display Image produced by unit 12. A third light beam C emitted by the light emitting unit 13 reaches the object through the other mirror 18, the first lens 14, the second lens 15 and the objective lens group, and is reflected by the object back to the receiving unit to The distance of the object from the rangefinder 10 is calculated.

In the above-mentioned structure, the size of the sensor module 11 in the Y direction as shown in FIG. 1 is relatively large, so that the volume of the rangefinder 10 equipped with the sensor module 11 is too large. Second beam B There are many times of reflection when passing through the ridge module 11, resulting in the brightness of the image generated by the display unit 12 being reduced. In addition, the effective diameter of the third light beam C emitted by the light emitting unit 13 and the effective diameter of the second light beam B emitted by the display unit 12 interfere with each other, causing the energy of the third light beam C emitted by the light emitting unit 13 to be weakened.

In view of this, the purpose of the present invention is to provide a rangefinder, which uses a novel structure to reduce the size of the module, while ensuring the brightness of the image generated by the display unit and the energy of the light beam emitted by the optical transceiver Is high enough.

One of the embodiments of the present invention has a scallop module, including a first scallop, a second scallop, a third scallop, and a fourth scallop. The first ridge includes a roof surface, a first surface and a second surface. The second ridge includes a third side, a fourth side, and a fifth side, wherein the third side of the second ridge is adjacent to the first side of the first ridge. The third ridge includes a sixth side and a seventh side, wherein the sixth side of the third ridge is adjacent to the fifth side of the second ridge. The fourth ridge includes a ninth side, wherein the ninth side of the fourth ridge is adjacent to the seventh side of the third ridge. Wherein, a first light beam emitted by an object enters the first beam from the second surface, is sequentially reflected by the first surface and the roof surface, and leaves the first beam from the first surface, from the The third face enters the second ridge, is sequentially reflected by the fourth face, the fifth face, and the third face, and leaves the second ridge from the fourth face.

In another embodiment, the ridge module further includes a coating layer, disposed between the fifth surface of the second ridge and the sixth surface of the third ridge, and used to reflect the first beam.

The rangefinder of one embodiment of the present invention includes an objective lens group, an aforementioned lens module, and an eyepiece group. Wherein, the lens module is disposed between the objective lens group and the eyepiece group, the first light beam sequentially passes through the objective lens group, the lens module and the eyepiece group, and a central axis of the objective lens group and the eyepiece group A central axis of the eyepiece group is parallel to each other without overlapping.

In another embodiment, the third frame further includes an eighth side, and the rangefinder further includes a display unit, which is arranged on one side of the eighth face of the third frame and is used for emitting a first Two beams.

In another embodiment, the second light beam enters the third beam from the eighth surface, is reflected by the seventh surface, and enters the second beam through the sixth surface and the fifth surface in sequence, and is The third surface reflects, leaves the second ridge from the fourth surface, and passes through the eyepiece group.

In another embodiment, the third ridge further includes an eighth side, the fourth ridge further includes a tenth side and an eleventh side, and the rangefinder further includes a light receiving unit or a light A transmitting unit, and the light transmitting unit or the light receiving unit is arranged on one side of the tenth surface of the fourth beam, and used for emitting or receiving a third light beam.

In another embodiment, the third light beam emitted by the light emitting unit enters the fourth beam from the tenth surface, is sequentially reflected by the ninth surface and the eleventh surface, and sequentially passes through the fourth beam The nine sides and the seventh side enter the third ridge, are reflected by the eighth side, enter the second ridge through the sixth and fifth sides in sequence, are reflected by the fourth side, and pass through in sequence The third surface and the first surface enter the first ridge, are sequentially reflected by the roof surface and the first surface, leave the first ridge from the second surface, and pass through the objective lens group to reach the object.

In another embodiment, the third light beam reflected by the object passes through the objective lens group, enters the first beam from the second surface, is sequentially reflected by the first surface and the roof surface, and sequentially passes through the The first surface and the third surface enter the second surface, are reflected by the fourth surface, enter the third surface through the fifth surface and the sixth surface in sequence, and are reflected by the eighth surface, in sequence Enter the fourth beam through the seventh surface and the ninth surface, be sequentially reflected by the eleventh surface and the ninth surface, and leave the fourth beam from the tenth surface to reach the light receiving unit.

In another embodiment, the ridge module further includes a coating layer, disposed between the fifth surface of the second ridge and the sixth surface of the third ridge, and used to reflect the first beam At the same time, the second light beam is allowed to pass.

In another embodiment, the ridge module further includes a coating layer, disposed between the fifth surface of the second ridge and the sixth surface of the third ridge, and used to reflect the first The light beam allows the third light beam to pass through at the same time.

10, 20‧‧‧Rangefinder

11、21‧‧‧Single Module

12, 22‧‧‧Display unit

13, 23‧‧‧Light emitting unit

14, 24‧‧‧The first 稜鏡

15, 25‧‧‧Second 稜鏡

16, 26‧‧‧The third 稜鏡

17, 18‧‧‧Mirror

27‧‧‧Fourth 稜鏡

241‧‧‧Roof surface

242‧‧‧The first side

243‧‧‧Second Side

251‧‧‧The third side

252‧‧‧Fourth side

253‧‧‧Fifth Side

261‧‧‧Sixth side

262‧‧‧Seventh side

263‧‧‧The eighth side

271‧‧‧Side Ninth

272‧‧‧Tenth Side

273‧‧‧The Eleventh Side

A‧‧‧First beam

B‧‧‧Second beam

C‧‧‧Third beam

Figure 1 is a schematic diagram of the structure of a traditional rangefinder.

2A~2C are schematic diagrams of the structure of the rangefinder according to the first embodiment of the present invention.

Please refer to FIGS. 2A to 2C. The rangefinder 20 according to the first embodiment of the present invention includes an objective lens group (not shown), a light module 21, a display unit 22, a light emitting unit 23, and a light emitting unit. The receiving unit (not shown) and an eyepiece group (not shown). Among them, a first light beam A emitted by an object (not shown) passes through the objective lens group, the lens module 21 and the eyepiece group in sequence, and a second light beam B emitted by the display unit 22 passes through the lens group in sequence The module 21 and the eyepiece group, and a third light beam C emitted by the light emitting unit 23 reaches the object through the objective lens group and the lens module 21, and is reflected by the object back to the light receiving unit. With this configuration, the user can view the image of the object and the image generated by the display unit 22 through the eyepiece group, and know the distance of the object from the rangefinder 20.

The lens module 21 is disposed between the objective lens group and the eyepiece lens group, and includes a first lens 24, a second lens 25, a third lens 26, and a fourth lens 27. In the first embodiment, the first ridge 24 is a ridge ridge, and includes a ridge surface 241, a first surface 242, and a second surface 243, wherein the ridge surface 241 is formed with a total reflection film, and the An anti-reflection film is formed on one side 242 and the second side 243. The second ridge 25 is a four-cornered ridge, and includes a third side 251, a fourth side 252, and a fifth side 253. The third ridge 26 is a triangular ridge and includes a sixth face 261, a seventh face 262, and an eighth face 263, wherein the seventh face 262 and the eighth face 263 are formed with anti-reflection films. The fourth beam 27 is a four-cornered beam, and includes a ninth surface 271, a tenth surface 272, and an eleventh surface 273. The upper half of the ninth surface 271 (that is, higher than the third beam C forms an anti-reflection film on the part of the reflection point on the ninth surface 271), the lower half of the ninth surface 271 (that is, the remaining part except the upper half of the ninth surface 271) forms a total reflection film, and the tenth surface An anti-reflection film is formed on 272, and a total reflection film is formed on the eleventh side 273.

Specifically, the second surface 243 of the first lens 24 faces the objective lens group, the third surface 251 of the second lens 25 is adjacent to the first surface 242 of the first lens 24, and the sixth surface of the third lens 26 is The surface 261 is adjacent to the fifth surface 253 of the second ridge 25. To further illustrate, the sixth side 261 of the third ridge 26 is attached to the fifth side 253 of the second ridge 25, and the fourth ridge 27 is The nine face 271 is adjacent to the seventh face 262 of the third lens 26, and the fourth face 252 of the second lens 25 faces the eyepiece group. It is worth noting that a coating layer (not shown) is formed between the fifth surface 253 of the second ridge 25 and the sixth surface 261 of the third ridge 26, and the coating layer is used to reflect the first light beam A, while allowing the second beam B and the third beam C to pass. Among them, the first beam A is a visible beam, the second beam B is an image beam, and the third beam C is a laser beam or an invisible beam. Compared with the conventional ridge module, the ridge module 21 of the present invention has a smaller size in the Y direction as shown in FIGS. 2A to 2C, and the third ridge module 26 and the fourth ridge module of the present invention have a smaller size in the Y direction as shown in FIGS. The 稜鏡 27 also has a smaller size. With such a configuration, it can also be ensured that the rangefinder 20 provided with the ridge module 21 has a smaller volume.

In addition, the display unit 22 is disposed on the side of the eighth surface 263 of the third frame 26, and the light emitting unit 23 is disposed on the side of the tenth surface 272 of the fourth frame 27. In this embodiment, the display unit 22 may be an organic light emitting diode (OLED), a light emitting diode (LED) or a liquid crystal display (LCD).

As shown in Figure 2A, when the first beam A emitted by the object enters the rangefinder 20, the first beam A passes through the objective lens group, enters the first beam 24 from the second surface 243, and is sequentially first The surface 242 reflects the roof surface 241 and leaves the first ridge 24 from the first surface 242. The first beam A then It enters the second ridge 25 from the third side 251, is reflected by the fourth side 252, the fifth side 253, and the third side 251 in this order, and leaves the second ridge 25 from the fourth side 252. Eventually, the first light beam A leaving the lens module 21 will pass through the eyepiece group for the user to view the image of the object. It is worth noting that the first beam A before entering the lens module 21 and the first beam A leaving the lens module 21 are not coaxial. Therefore, the objective lens group and the eyepiece group of the rangefinder 20 are also set as Non-coaxial. In other words, a central axis (not shown) of the objective lens group and a central axis (not shown) of the eyepiece lens group are only parallel to each other without overlapping. With this setting, the eye width of the rangefinder 20 (for example, a binocular rangefinder) can be reduced.

As shown in Figure 2B, the second light beam B emitted by the display unit 22 enters the third beam 26 from the eighth surface 263, is reflected by the seventh surface 262, and enters the third beam through the sixth surface 261 and the fifth surface 253 in sequence. The second ridge 25 is reflected by the third side 251 and leaves the second ridge 25 from the fourth side 252. Eventually, the second light beam B leaving the lens module 21 will pass through the eyepiece group for the user to view the image generated by the display unit 22. Compared with the conventional beam module, the second light beam B is reflected less times when passing through the beam module 21, thereby preventing the brightness of the image generated by the display unit 22 from being reduced.

As shown in FIG. 2C, the third light beam C emitted by the light emitting unit 23 enters the fourth beam 27 from the tenth surface 272, is sequentially reflected by the ninth surface 271 and the eleventh surface 273, and is reflected from the ninth surface 271 left the fourth 稜鏡27. The third light beam C enters the third beam 26 from the seventh surface 262, is reflected by the eighth surface 263, enters the second beam 25 through the sixth surface 261 and the fifth surface 253 in sequence, and is reflected by the fourth surface 252, and From the third side 251, leave the second 稜鏡25. The third light beam C then enters the first beam 24 from the first surface 242, is sequentially reflected by the roof surface 241 and the first surface 242, and leaves the first beam 24 from the second surface 243. The third light beam C leaving the lens module 21 passes through the objective lens group to reach the object. Finally, the third light beam C will be reflected by the object and reach the light receiving unit. The light receiving unit receives the third light beam C reflected by the object, so that the distance meter 20 can calculate the distance of the object from the distance meter 20. With the help of the module 21, the effective diameter of the third light beam C emitted by the light emitting unit 23 and the effective diameter of the second light beam B emitted by the display unit 22 can be prevented from interfering with each other. Compared to the conventional For the sturdy module, the energy of the third light beam C emitted by the light emitting unit 23 is relatively high.

In the second embodiment, the positions of the light emitting unit 23 and the light receiving unit are interchanged. In other words, the light receiving unit is arranged on one side of the tenth surface 272 of the fourth frame 27. During operation, the third light beam C emitted by the light emitting unit 23 is reflected by the object, and sequentially passes through the objective lens group and the lens module 21 to reach the light receiving unit. Specifically, the third light beam C passing through the objective lens group enters the first beam 24 from the second surface 243, is sequentially reflected by the first surface 242 and the roof surface 241, and leaves the first beam 24 from the first surface 242. . The third light beam C enters the second beam 25 from the third surface 251, is reflected by the fourth surface 252, sequentially enters the third beam 26 through the fifth surface 253 and the sixth surface 261, and is reflected by the eighth surface 263, and From the seventh side 262, leave the third 稜鏡 26. The third light beam C then enters the fourth beam 27 from the ninth surface 271, is sequentially reflected by the eleventh surface 273 and the ninth surface 271, leaves the fourth beam 27 from the tenth surface 272, and reaches the light receiving unit . The light receiving unit receives the third light beam C reflected by the object, so that the distance meter can calculate the distance of the object from the distance meter. The rest of the settings and operations are similar to those of the first embodiment, and will not be repeated here.

20‧‧‧Rangefinder

21‧‧‧Maze Module

22‧‧‧Display unit

23‧‧‧Light emitting unit

24‧‧‧First 稜鏡

25‧‧‧Second 稜鏡

26‧‧‧Third 稜鏡

27‧‧‧Fourth 稜鏡

241‧‧‧Roof surface

242‧‧‧The first side

243‧‧‧Second Side

251‧‧‧The third side

252‧‧‧Fourth side

253‧‧‧Fifth Side

261‧‧‧Sixth side

262‧‧‧Seventh side

263‧‧‧The eighth side

271‧‧‧Side Ninth

272‧‧‧Tenth Side

273‧‧‧The Eleventh Side

A‧‧‧First beam

Claims (10)

A kind of jerk module, including: A first ridge, including a roof surface, a first surface and a second surface; A second ridge, including a third side, a fourth side, and a fifth side, wherein the third side of the second ridge is adjacent to the first side of the first ridge; A third ridge includes a sixth side and a seventh side, wherein the sixth side of the third ridge is adjacent to the fifth side of the second ridge; and A fourth ridge, including a ninth side, wherein the ninth side of the fourth ridge is adjacent to the seventh side of the third ridge; Wherein, a first light beam emitted by an object enters the first beam from the second surface, is sequentially reflected by the first surface and the roof surface, and leaves the first beam from the first surface, from the The third face enters the second ridge, is sequentially reflected by the fourth face, the fifth face, and the third face, and leaves the second ridge from the fourth face. As described in item 1 of the scope of the patent application, it further includes a coating layer disposed between the fifth side of the second ridge and the sixth side of the third ridge, and is used for The first light beam is reflected. A rangefinder, including: An objective lens group; It is the same as the 稜鏡 module described in item 1 of the scope of patent application; and One eyepiece group; Wherein, the lens module is disposed between the objective lens group and the eyepiece group, the first light beam sequentially passes through the objective lens group, the lens module and the eyepiece group, and a central axis of the objective lens group and the eyepiece group A central axis of the eyepiece group is parallel to each other. Such as the rangefinder described in item 3 of the scope of patent application, wherein the third ridge further includes an eighth On the other hand, the rangefinder further includes a display unit, which is arranged on one side of the eighth face of the third beam and used for emitting a second light beam. The rangefinder according to item 4 of the scope of patent application, wherein the second light beam enters the third beam from the eighth side, is reflected by the seventh side, and sequentially passes through the sixth side and the fifth side It enters the second lens, is reflected by the third surface, leaves the second lens from the fourth surface, and passes through the eyepiece group. For example, the rangefinder described in item 3 or item 5 of the scope of patent application, wherein the third ridge further includes an eighth side, the fourth ridge further includes a tenth side and an eleventh side, the The rangefinder further includes a light receiving unit or a light emitting unit, and the light emitting unit or the light receiving unit is arranged on one side of the tenth surface of the fourth beam and used to emit or receive a third light beam . For the rangefinder described in item 6 of the scope of patent application, the third light beam emitted by the light emitting unit enters the fourth beam from the tenth side, and is sequentially affected by the ninth side and the eleventh side. Surface reflection, enter the third ridge through the ninth and seventh sides in sequence, be reflected by the eighth side, and enter the second ridge through the sixth and fifth sides in sequence, and be The fourth surface reflects, enters the first ridge through the third surface and the first surface in sequence, is reflected by the roof surface and the first surface in sequence, and leaves the first ridge from the second surface, and Go through the objective lens group to reach the object. For the rangefinder described in item 6 of the scope of patent application, the third light beam reflected by the object passes through the objective lens group, enters the first beam from the second surface, and is sequentially received by the first surface and the The reflection of the roof surface enters the second ridge through the first and third sides in sequence, is reflected by the fourth side, and enters the third ridge through the fifth and sixth sides in sequence. The eighth side reflects sequentially through the seventh side and the ninth side and enters the fourth ridge, is sequentially reflected by the eleventh side and the ninth side, and leaves the fourth side from the tenth side.稜鏡 to reach the light receiving unit. As described in item 4 of the scope of patent application, wherein the ridge module further includes a coating layer disposed on the fifth side of the second ridge and the sixth side of the third ridge. Between, and use To reflect the first light beam while allowing the second light beam to pass through. For the rangefinder described in item 6 of the scope of patent application, the ridge module further includes a coating layer disposed on the fifth side of the second ridge and the sixth side of the third ridge. And used to reflect the first light beam while allowing the third light beam to pass through.

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