TWI699572B - Optical device - Google Patents

Abstract

An optical device includes a reflecting unit, an ocular unit and a light source. The reflecting unit includes a first lens and a second lens, wherein the first lens is a segment of a first meniscus lens, the second lens is a segment of a second meniscus lens, the first meniscus lens and the second meniscus lens are connected to form a third meniscus lens, and the third meniscus lens has a first optical axis and a focal point. The light source is disposed on the first optical axis and the focal point and between the reflecting unit and the ocular unit. The optical device satisfies 2.5

D1/D2

Description

Optical device

The present invention relates to an optical device, in particular to an optical device with a point light source aiming system.

The conventional sight usually includes an objective lens, a reflecting lens, an eyepiece, and a light source. The main functions of the objective lens and the eyepiece are waterproof and dustproof, and the reflecting lens can reflect a light beam emitted by the light source to use In addition to the eyes of the user, a light beam emitted by an object observed by the user can pass through. With this configuration, the user can simultaneously observe the image of the object and a light spot generated by the light source through the sight, so as to aim at the object through the light spot.

However, if the light beam received by the user (for example, the light beam emitted by the light source or the light beam emitted by the object) is not a parallel beam, then when the user's eyes are along an axis perpendicular to the optical axis of the sight When the direction moves away from the optical axis of the sight, the image of the object or the light spot is likely to be distorted, thereby causing inaccuracy in the user's operation.

In view of this, the object of the present invention is to provide an optical device whose optical design helps to keep the light beam reaching the user parallel, so as to avoid distortion and distortion of the image of the object or the light spot generated by the light source, and at the same time help to reduce Mechanical components to reduce the volume and cost of optical devices.

D1/D2

4.5，其中D1係指在該第一光軸上該光源距該反射單元間的第一距離，D2係指在該第一光軸上該光源距該目鏡單元間的第二距離。 One embodiment of the optical device of the present invention includes a reflection unit, an eyepiece unit and a light source. The reflection unit includes a first lens and a second lens, wherein the first lens is a part of a first meniscus lens, and the second lens is a part of a second meniscus lens, The first meniscus lens and the second meniscus lens are combined with each other to form a third meniscus lens, and the third meniscus lens has a first optical axis and a focus. The light source is arranged on the first optical axis and the focal point, and is located between the reflecting unit and the eyepiece unit. The optical device satisfies 2.5

D1/D2

4.5, where D1 refers to the first distance between the light source and the reflecting unit on the first optical axis, and D2 refers to the second distance between the light source and the eyepiece unit on the first optical axis.

D3/D2

5.5，其中D3係指在該第一光軸上該反射單元距該目鏡單元間的第三距離，D2係指在該第一光軸上該光源距該目鏡單元間的第二距離。 In another embodiment, a reflective surface is provided between the first lens and the second lens, and the reflective surface is used to selectively reflect light beams. The optical device meets 3.5

D3/D2

5.5, where D3 refers to the third distance between the reflecting unit and the eyepiece unit on the first optical axis, and D2 refers to the second distance between the light source and the eyepiece unit on the first optical axis.

D3/D1

1.5，其中D3係指在該第一光軸上該反射單元距該目鏡單元間的第三距離，D1係指在該第一光軸上該光源距該反射單元間的第一距離。 In another embodiment, the first optical axis is located above or below the upper edge of the reflecting unit, and is separated from the upper edge of the reflecting unit by a distance, and the distance is approximately 5 millimeters (mm). The optical device more satisfies 1.20

D3/D1

1.5, where D3 refers to the third distance between the reflecting unit and the eyepiece unit on the first optical axis, and D1 refers to the first distance between the light source and the reflecting unit on the first optical axis.

θ/D3

0.30，其中，θ係指該角度，D3係指在該第一光軸上該反 射單元距該目鏡單元間的第三距離。 In another embodiment, the eyepiece unit and the reflecting unit constitute a second optical axis, the reflecting unit has a central axis, and the central axis passes through the light source and is inclined at an angle with respect to the second optical axis. The range of angle is 10~16 degrees, and the optical device satisfies a conditional formula: 0.15

θ/D3

0.30, where θ refers to the angle, and D3 refers to the third distance between the reflecting unit and the eyepiece unit on the first optical axis.

In another embodiment, one side of the reflecting unit facing the object end has a positive refractive power, and the other side of the reflecting unit facing the image end has a negative refractive power.

In another embodiment, a mark is provided on the upper edge of the reflecting unit, and the mark is used to locate a predetermined position.

In another embodiment, the eyepiece unit and the reflecting unit constitute a second optical axis, and the light source is used to emit a first light beam. The first light beam enters the reflecting unit, is reflected by the reflecting unit, and moves along the The second optical axis passes through the eyepiece unit; after a second light beam emitted by an object enters the optical device, it sequentially passes through the reflecting unit and the eyepiece unit along the second optical axis.

In another embodiment, a reflective surface is provided between the first lens and the second lens, and the first light beam incident on the reflective unit passes through the second lens, is reflected by the reflective surface, and moves along the second lens. The optical axis passes through the second lens and the eyepiece unit in sequence. The second light beam passes through the first lens, the reflecting surface, the second lens and the eyepiece unit in sequence.

In another embodiment, the optical device further includes a body, a pair of object pressure rings, a pair of eyepiece barrels, an inner lens barrel, a compensation device, and an elastic member. The body has a front end and a rear end. The pair of pressure rings are arranged at the front end. The pair of eyepiece barrels are arranged at the rear end and used to carry the eyepiece unit. The inner lens barrel is disposed in the body, located between the pair of object pressure rings and the pair of eyepiece barrels, and has a first end and a second end, wherein the reflection unit is disposed at the first end The light source is arranged at the second end, and the first end is fixed by the pair of pressure rings. The compensation device passes through the body, abuts against the second end of the inner lens barrel, and is used for adjusting the inner lens barrel relative to the body. The elastic member is arranged in the body, abuts against the inner lens barrel, and is used for pushing the inner lens barrel through its restoring force to keep the inner lens barrel in contact with the compensation device.

In another embodiment, the optical device further includes a power supply unit and a control unit, wherein the power supply unit is disposed on the main body and connected to the light source to supply power, and the control unit is disposed on the main body, And connected to the light source to control the light source.

1‧‧‧The first meniscus lens

3‧‧‧The second meniscus lens

11‧‧‧Reflection unit

13‧‧‧Eyepiece unit

15‧‧‧Light source

17‧‧‧Eyes

19‧‧‧Object

51‧‧‧Ontology

53‧‧‧Inner tube

54‧‧‧Outer tube

55‧‧‧Pressure ring

57‧‧‧Control Unit

59‧‧‧Power Supply Unit

63‧‧‧Eyepiece tube

65‧‧‧Elastic parts

67‧‧‧Compensation device

71‧‧‧Battery

73‧‧‧Circuit board

75‧‧‧Battery cover

81‧‧‧Base

83‧‧‧Button

85‧‧‧Circuit board

100‧‧‧Aiming System

111‧‧‧First lens

113‧‧‧Second lens

115‧‧‧Reflecting surface

117‧‧‧Mark

200‧‧‧Optical device

A, B‧‧‧Beam

C‧‧‧Central axis

D1‧‧‧First distance

D2‧‧‧Second distance

D3‧‧‧third distance

L‧‧‧second optical axis

O‧‧‧First optical axis

T‧‧‧Distance

θ‧‧‧angle

Ø‧‧‧Adjustment range

Figure 1 is a schematic diagram of an embodiment of the sighting system of the optical device according to the present invention.

Figure 2 is a front view of the reflecting unit in Figure 1.

Fig. 3 is an optical path diagram of the light beam emitted by the light source in Fig. 1.

Figure 4 is the optical path diagram of the beam emitted by the object received by the sighting system in Figure 1.

Figure 5 is a schematic diagram of an embodiment of the optical device according to the present invention.

Please refer to Figures 1 and 5 at the same time. Figure 5 shows one embodiment of the optical device 200 of the present invention. Figure 1 shows the sighting system 100 in the optical device 200. The sighting system 100 is introduced first, and then the optical装置200。 Device 200.

As shown in Figure 1, the sighting system 100 includes a reflecting unit 11, an eyepiece unit 13 and a light source 15. Through the eyepiece unit 13 of the sighting system 100, the user can simultaneously observe the image of an object 19 and A light spot (not shown) generated by the light source 15 is used to aim the object 19 with the light spot. The arrangement of these elements will be described in detail below: the reflection unit 11 is mainly composed of a first lens 111 and a second lens 113. It is worth noting that the first lens 111 is a part of a complete first meniscus lens 1 (as shown in the dotted line in Figure 1), and the second lens 113 is a complete second meniscus lens 3 (as shown in the dotted line in Figure 1) part. Specifically, one of the first meniscus lens 1 The concave surface is first adhered to a convex surface on the second meniscus lens 3 to form a third meniscus lens, and the third meniscus lens is then cut to form the reflection unit 11. With this arrangement, the side of the reflecting unit 11 facing the object end (that is, the side of the first lens 111 facing the object end) has positive refractive power, and the other side of the reflecting unit 11 facing the image end (that is, the side of the second lens 113 facing the image end) has Negative refractive power. A reflective surface 115 is provided between the first lens 111 and the second lens 113, and the reflective surface 115 is used to selectively reflect the light beam (that is, reflect a part of the light beam and let the other part of the light beam pass). In addition, a mark 117 is provided on the upper edge of the reflection unit 11, and the mark 117 can be used to locate a predetermined position in the aiming system 100.

Referring to FIG. 2, if the reflection unit 11 is viewed from the side where the second lens 113 is located, it can be found that the shape of the reflection unit 11 is circular (but the invention is not limited to this). As shown in Figure 1, the circular reflecting unit 11 has a central axis C passing through its center, and the third meniscus lens (that is, the bonded first meniscus lens 1 and the second meniscus lens 3) It has a first optical axis O, and the central axis C is inclined at an angle θ with respect to the first optical axis O, wherein the angle θ in the preferred embodiment of the present invention ranges from 11 to 15 degrees, according to common knowledge The understandable tolerance range is about ±5%, that is, the range of the angle θ is 10.45~15.75 degrees. It is worth noting that the light source 15 is arranged on the central axis C and the first optical axis O, located at the focal point of the third meniscus lens, and between the reflecting unit 11 and the eyepiece unit 13, and the reflecting unit 11 and the eyepiece The unit 13 constitutes a second optical axis L.

After being matched with a mechanism element (not shown), the reflection unit 11 and the eyepiece unit 13 can function as waterproof and dustproof, which can serve as the first protection of the sighting system 100. Compared with a conventional sight with an objective lens unit, the sight system 100 of the present invention replaces the traditional objective lens unit with the reflecting unit 11, and can reduce the mechanical components of the corresponding objective lens unit. In addition, by Due to the reduction of mechanical components, the volume and cost of the aiming system 100 of the present invention are significantly reduced.

Among them, the light source 15 is a laser diode (LD) or a light emitting diode (Light Emitting Diode, LED), the first meniscus lens 1 is a concave-convex lens, and the second meniscus lens 3 is a convex-concave lens , And the reflecting unit 11 is a lens having a concave surface and a convex surface, and the concave surface and the convex surface have the same curvature.

In this embodiment, the first optical axis O is located below the upper edge of the reflective unit 11 and is separated from the upper edge of the reflective unit 11 by a distance T, and the distance T is approximately 5 millimeters (mm). In another embodiment, the optical axis (not shown) of the third meniscus lens is located above the upper edge of the reflective unit 11 and is separated from the upper edge of the reflective unit 11 by a distance, and the distance is approximately 5 millimeters (mm).

Please refer to FIG. 3. During operation, the light source 15 emits a light beam A to the reflecting unit 11. After the light beam A enters the reflecting unit 11, it passes through the second lens 113, is reflected by the reflecting surface 115, and sequentially passes through the second lens 113 and the eyepiece unit 13 along the second optical axis L to be received by the user's eye 17. When the user observes through the eyepiece unit 13, the light spot generated by the aforementioned light source 15 can be observed. It is worth noting that because the light source 15 is located at the first optical axis O and the focal point of the third meniscus lens, the light beam A reflected by the reflecting surface 115 and reaching the user's eye 17 is a parallel light beam. With this arrangement, when the user's eyes 17 move up and down along a direction perpendicular to the second optical axis L and leave the second optical axis L, the light spot is not easily deformed. In other words, the parallax of the light spot approaches zero.

In addition to the light beam A emitted by the light source 15, the user will also receive a light beam B emitted by the object 19 when operating the aiming system 100. Please refer to Figure 4, the beam B emitted by the object 19 enters the aiming system 100, and sequentially passes through the first lens 111, the reflective surface 115, and the second transparent The mirror 113 and the eyepiece unit 13 are received by the user's eyes 17. When the user observes through the eyepiece unit 13, the image of the object 19 can be observed. It is worth noting that, since the refractive power of the reflecting unit 11 approaches zero, the light beam B reaching the user's eye 17 through the reflecting unit 11 and the eyepiece unit 13 is a parallel light beam. With this arrangement, when the user's eyes 17 move up and down along the direction perpendicular to the second optical axis L and leave the second optical axis L, the image of the object 19 is not easily deformed and distorted. In other words, the parallax of the image of the object 19 approaches zero.

The reflection focal length f of the reflection unit 11 of the present invention is about 43~53 mm (mm), and the preferred embodiment part is 46~50 mm. The tolerance range that can be understood by ordinary knowledgeable persons is about ±5% , That is, the range of the reflection focal length f is approximately 43.7-52.5 mm; where the first distance D1 between the light source 15 and the reflecting unit 11 along the first optical axis O, and the first distance D1 along the first optical axis O The second distance D2 between the light source 15 and the eyepiece unit 13, and the third distance D3 between the reflection unit 11 and the eyepiece unit 13 along the first optical axis O, where the third distance D3 is equal to the first The sum of the distance D1 and the second distance D2, wherein the first distance D1 in the present invention is preferably 45 mm, and the tolerance range that can be understood by ordinary knowledgeable persons is about ±5%, that is, the first distance The range of D1 is about 42.75~47.25 mm. The second distance D2 is preferably 12 mm. The tolerance range that can be understood by ordinary knowledgeable persons is about ±5%, that is, the range of the second distance D2 is about 11.4~12.6 mm, the third distance D3 is preferably 57 mm, the tolerance range that can be understood by ordinary knowledgeable persons is about ±5%, that is, the range of the third distance D3 is about 54.15~59.85 mm , Wherein the ratio relationship between the first distance D1, the second distance D2, the third distance D3, and the angle θ is shown in the table below. When the technology in this case can meet any of the following conditions, it represents the The light source 15 is in a proper position with the reflecting unit 11 or the eyepiece unit 13, especially when the position of the light source is in a proper position, the light source 15 can generate the The light spot (not shown) is clearly visible without blurring. In addition, the distance between the reflecting unit 11 or the eyepiece unit 13 also indicates the miniaturization and compactness of the device of the present invention, and the size of the angle is the distance from the light source. The reflecting unit 11 is related, so if any conditional expression below can be satisfied in the present invention, it means that the light source, the reflecting unit 11 or the eyepiece unit 13 of the present invention is in a proper position.

The reflecting unit 11 of the sighting system 100 of the present invention can not only replace the objective lens unit of the traditional sight, but also keep the light beam A emitted by the light source 15 parallel to the light beam B emitted by the object 19, so as to avoid the light spot generated by the light source 15 and The image of the object 19 is distorted. Therefore, the imaging quality of the sighting system 100 is improved, and its volume and cost are also reduced.

Please refer to Fig. 5, which shows the optical device 200 of the present invention. In addition to the aforementioned sighting system 100, the optical device 200 further includes an outer barrel 54, an inner barrel 53, at least one compensation device 67, an elastic member 65, A power supply unit 59 and a control unit 57, and the outer lens barrel 54 includes a pair of object pressing rings 55, a body 51 and a pair of eyepiece barrels 63.

Specifically, the main body 51 has a front end and a rear end. The object pressing ring 55 is provided at the front end and can be used to fix the inner lens barrel 53, while the eyepiece barrel 63 is screwed to the rear end and used To carry the eyepiece unit 13. The inner lens barrel 53 is disposed in the main body 51, is located between the object pressing ring 55 and the eyepiece unit 13 (or the eyepiece barrel 63 ), and is used to carry the reflection unit 11 and the light source 15. It is worth noting that the reflection unit 11 is disposed at a first end of the inner barrel 53, and the light source 15 It is disposed at a second end of the inner barrel 53, the first end is opposite to the second end, and the object pressing ring 55 is fixed in the main body 51. The compensation device 67 passes through the main body 51, abuts against the second end of the inner barrel 53 and is used to adjust the inner barrel 53 relative to the main body 51, wherein the adjustment range of the compensation device relative to the inner barrel 53 is approximately It is 1 degree, and the tolerance range that can be understood by ordinary knowledgeable persons is about ±5%, that is, the adjustment range Ø is about 0.95 to 1.05 degrees. The elastic member 65 is disposed in the main body 51, abuts against the inner barrel 53, and is used for pushing the inner barrel 53 through its restoring force, so that the inner barrel 53 and the compensation device 67 are kept in contact. The power supply unit 59 is arranged on the main body 51 and connected to the light source 15 to supply power. The control unit 57 is disposed on the main body 51 and connected to the light source 15 to control the light source 15 (for example, turn on, turn off or change the brightness).

The power supply unit 59 includes a battery cover 75, a battery 71, a circuit board 73, and a base 81. The base 81 is disposed on the body 51, the battery 71 and the circuit board 73 are disposed on the base 81, and the battery cover 75 It is used to cover the battery 71, the circuit board 73 and the base 81. The control unit 57 includes a circuit board 85 and two buttons 83. The circuit board 85 is connected to the light source 15, and the buttons 83 are connected to the circuit board 85 so that the user can control the light source 15 by operating the buttons 83. The compensation device 67 can be a height compensation device or a wind deviation compensation device. The height compensation device is usually installed above the main body 51, and the wind compensation device is usually installed on the left or right of the main body 51. The arrangement and operation of the remaining components are similar to the foregoing embodiment, so they will not be repeated here.

1.‧‧Convex lens

3‧‧‧Convex-concave lens

11‧‧‧Reflection unit

13‧‧‧Eyepiece unit

15‧‧‧Light source

17‧‧‧Eyes

19‧‧‧Object

100‧‧‧Aiming System

111‧‧‧First lens

113‧‧‧Second lens

115‧‧‧Reflecting surface

117‧‧‧Mark

C‧‧‧Central axis

D1‧‧‧First distance

D2‧‧‧Second distance

D3‧‧‧third distance

L‧‧‧second optical axis

O‧‧‧First optical axis

T‧‧‧Distance

Ø‧‧‧Adjustment range

Claims (9)

An optical device comprising: a reflecting unit, comprising a first lens and a second lens, wherein the first lens is a part of a first meniscus lens, and the second lens is a second meniscus A part of a shaped lens, the first meniscus lens and the second meniscus lens are combined with each other to form a third meniscus lens, and the third meniscus lens has a first optical axis and A focal point; an eyepiece unit; and a light source arranged on the first optical axis and the focal point, and located between the reflecting unit and the eyepiece unit; wherein the upper edge of the reflecting unit is provided with a mark, and by The mark is positioned at a preset position; among them, it satisfies a condition: 2.5

D1/D2

4.5 Wherein, D1 refers to the first distance between the light source and the reflecting unit on the first optical axis, and D2 refers to the second distance between the light source and the eyepiece unit on the first optical axis. An optical device comprising: a reflecting unit, comprising a first lens and a second lens, wherein the first lens is a part of a first meniscus lens, and the second lens is a second meniscus A part of a shaped lens, the first meniscus lens and the second meniscus lens are combined with each other to form a third meniscus lens, and the third meniscus lens has a first optical axis and A focal point; an eyepiece unit; and a light source, arranged on the first optical axis and the focal point, and located between the reflecting unit and the eyepiece unit; wherein, a condition is further satisfied: 2.5

D1/D2

4.5 Wherein, D1 refers to the first distance between the light source and the reflecting unit on the first optical axis, and D2 refers to the second distance between the light source and the eyepiece unit on the first optical axis; where the first optical axis A reflective surface is arranged between a lens and the second lens, and the reflective surface is used to selectively reflect the light beam; wherein, a condition is more satisfied: 3.5

D3/D2

5.5 Wherein, D3 refers to the third distance between the reflecting unit and the eyepiece unit on the first optical axis, and D2 refers to the second distance between the light source and the eyepiece unit on the first optical axis. An optical device comprising: a reflecting unit, including a first lens and a second lens, wherein the first lens is a part of a first meniscus lens, and the second lens is a second meniscus A part of a shaped lens, the first meniscus lens and the second meniscus lens are combined with each other to form a third meniscus lens, and the third meniscus lens has a first optical axis and A focal point; an eyepiece unit; and a light source, arranged on the first optical axis and the focal point, and located between the reflecting unit and the eyepiece unit; wherein, a condition is further satisfied: 2.5

D1/D2

4.5 Wherein, D1 refers to the first distance between the light source and the reflecting unit on the first optical axis, and D2 refers to the second distance between the light source and the eyepiece unit on the first optical axis; where the first optical axis An optical axis is located above or below the upper edge of the reflecting unit, and is separated from the upper edge of the reflecting unit by a distance, and the distance is approximately 5 millimeters (mm); among them, a condition is more satisfied: 1.20

D3/D1

1.50 Wherein, D3 refers to the third distance between the reflecting unit and the eyepiece unit on the first optical axis, and D1 refers to the first distance between the light source and the reflecting unit on the first optical axis. An optical device comprising: a reflecting unit, comprising a first lens and a second lens, wherein the first lens is a part of a first meniscus lens, and the second lens is a second meniscus A part of a shaped lens, the first meniscus lens and the second meniscus lens are combined with each other to form a third meniscus lens, and the third meniscus lens has a first optical axis and A focal point; an eyepiece unit; and a light source, arranged on the first optical axis and the focal point, and located between the reflecting unit and the eyepiece unit; wherein, a condition is further satisfied: 2.5

D1/D2

4.5 Wherein, D1 refers to the first distance between the light source and the reflecting unit on the first optical axis, and D2 refers to the second distance between the light source and the eyepiece unit on the first optical axis; where the eyepiece The unit and the reflecting unit constitute a second optical axis, the reflecting unit has a central axis, and the central axis passes through the light source and is inclined at an angle relative to the second optical axis, and the angle ranges from 10 to 16 degrees , Which satisfies a conditional formula: 0.15

θ/D3

0.30 where θ refers to the angle, and D3 refers to the third distance between the reflecting unit and the eyepiece unit on the first optical axis. An optical device comprising: a reflecting unit, comprising a first lens and a second lens, wherein the first lens is a part of a first meniscus lens, and the second lens is a second meniscus A part of a shaped lens, the first meniscus lens and the second meniscus lens are combined with each other to form a third meniscus lens, and the third meniscus lens has a first optical axis and A focal point; an eyepiece unit; and a light source, arranged on the first optical axis and the focal point, and located between the reflecting unit and the eyepiece unit; wherein, a condition is further satisfied: 2.5

D1/D2

4.5 Wherein, D1 refers to the first distance between the light source and the reflecting unit on the first optical axis, and D2 refers to the second distance between the light source and the eyepiece unit on the first optical axis; where the eyepiece The unit and the reflecting unit form a second optical axis, the light source is used to emit a first light beam, the first light beam enters the reflecting unit, is reflected by the reflecting unit, and passes through the eyepiece unit along the second optical axis; After a second light beam emitted by an object enters the optical device, it sequentially passes through the reflecting unit and the eyepiece unit along the second optical axis. An optical device comprising: a reflecting unit, comprising a first lens and a second lens, wherein the first lens is a part of a first meniscus lens, and the second lens is a second meniscus A part of a shaped lens, the first meniscus lens and the second meniscus lens are combined with each other to form a third meniscus lens, and the third meniscus lens has a first optical axis and A focal point; an eyepiece unit; and a light source, arranged on the first optical axis and the focal point, and located between the reflecting unit and the eyepiece unit; wherein, a condition is further satisfied: 2.5

D1/D2

4.5 Wherein, D1 refers to the first distance between the light source and the reflecting unit on the first optical axis, and D2 refers to the second distance between the light source and the eyepiece unit on the first optical axis; wherein, the The optical device further includes: a main body with a front end and a rear end; a pair of object pressing rings arranged at the front end; a pair of eyepiece barrels arranged at the rear end and used to carry the eyepiece unit; The inner lens barrel is arranged in the body, located between the pair of object pressure rings and the pair of eyepiece barrels, and has a first end and a second end, wherein the reflecting unit is arranged at the first end , The light source is arranged at the second end, and the first end is fixed by the pair of pressure rings; a compensation device passes through the body, abuts against the second end of the inner barrel, and is used The inner lens barrel is adjusted relative to the body; and an elastic member is arranged in the body, abuts against the inner lens barrel, and is used to push the inner lens barrel through its restoring force, so that the inner lens barrel and the compensation The device remains in contact. According to the optical device described in any one of items 1 to 6 of the scope of the patent application, the side of the reflecting unit facing the object end has a positive refractive power, and the other side of the reflecting unit facing the image end has a negative refractive power. The optical device according to any one of items 1 to 6 in the scope of patent application, wherein a reflective surface is provided between the first lens and the second lens, and the first light beam incident on the reflective unit passes through the The second lens is reflected by the reflective surface and passes through the second lens and the eyepiece unit in sequence along the second optical axis; wherein the second light beam sequentially passes through the first lens, the reflective surface, and the second lens Two lenses and the eyepiece unit. For example, the optical device described in item 6 of the scope of patent application further includes a power supply unit and a control unit, wherein the power supply unit is disposed on the body and connected to the light source to supply power, and the control unit is disposed at The main body is connected to the light source to control the light source.

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