JPH07306366A - Eyepiece unit for optical equipment - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide an eyepiece unit for an optical device that can reliably prevent dust and water from entering the inside of the main body of the optical device without increasing the number of parts or the number of assembly steps. [Structure] One end of a cylindrical outer cylinder 11 is attached to the rear end of the collimating telescope 1, and a cylindrical inner cylinder 13 holding an eyepiece 15 inside is attached to an inner peripheral portion of the outer cylinder 11. An annular eyepiece knob 17 made of an elastic member and covered with an annular eyepiece member 19 is attached to the outer peripheral portion of the inner cylinder 13 that is movably coupled in the optical axis L direction of 15 and projects from the other end of the outer cylinder 11. The flange 1705 of the eyepiece knob 17 and the inner cylinder 13 are attached.
Eyepiece 1 with a press ring 1311 screwed to the end of the eye
In the eyepiece lens unit 5 for positioning and holding 5 in the direction of the optical axis L, the eyepiece member 19 has an inner side surface 1711 of the flange 1705 and a lens 1505 facing the inner side surface 1711.
The annular bulging portion 1907, which is located between the surface 1505A of FIG.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an eyepiece lens unit in optical equipment.

[0002]

2. Description of the Related Art An eyepiece lens unit in an optical instrument such as a telescope, a video camera, a surveying instrument, a cylinder attached to the body of the optical instrument, an eyepiece lens held inside the cylinder, An annular eye contact member made of an elastic member is provided on the end side of the tubular body. A flange for eyepiece lens positioning is formed at the end opposite to the end attached to the optical device in the cylinder, and the eyepiece is located inside the cylinder from the end on the optical device side. The eyepiece lens is housed and held in the optical axis direction of the lens inside the cylinder by the retaining ring attached to the end of the cylinder on the optical device side and the flange.

Further, in the eyepiece lens unit, the cylindrical body is attached to the main body of the optical device, the eyepiece lens is held, and the eyepiece lens is attached to the inner peripheral portion of the outer cylinder. Some eyepieces are composed of an inner cylinder that is movably coupled in the optical axis direction, and the diopter can be adjusted by moving the inner cylinder with respect to the outer cylinder in the optical axis direction. In the lens unit, the inner cylinder is provided with a flange and an eye contact member for positioning and holding the eyepiece lens.

In these eyepiece lens units,
A seal member such as an O-ring is arranged between the flange and the outer peripheral portion of the eyepiece to prevent dust and water from entering the inside of the main body of the optical device from the end of the cylindrical body or the inner cylinder on the side of the eyepiece member. Set up.

[0005]

As described above, conventionally, in order to prevent dust and water from entering the inside of the main body of the optical device from the end of the cylindrical body or the inner cylinder, a dedicated seal member is used. Therefore, there has been a problem that the number of parts and the number of assembling steps of the eyepiece lens unit are increased, resulting in an increase in cost. Further, in the eyepiece lens unit of the type composed of the outer cylinder and the inner cylinder, the seal member is not provided between the outer cylinder and the inner cylinder, so that dust or water passes between the outer cylinder and the inner cylinder and the optical There is a possibility that it may enter the inside of the main body of the device and cause corrosion inside the optical device or malfunction of the optical device itself.

The present invention was devised in view of the above circumstances, and an object of the present invention is to increase the number of parts and the number of assembling steps from the end of the cylindrical body to the inside of the main body of the optical device. An object of the present invention is to provide an eyepiece lens unit of an optical device that can surely prevent intrusion. Further, an object of the present invention is to provide an eyepiece unit of a type composed of an outer cylinder and an inner cylinder, in which dust and water enter from the space between the outer cylinder and the inner cylinder into the main body of the optical device without increasing the number of parts and the number of assembly steps. An object of the present invention is to provide an eyepiece lens unit of an optical device that can reliably prevent

[0007]

In order to achieve the above object, the present invention is provided with an optical device main body, a cylindrical body attached to the optical device main body, and an end portion and an inside of the cylindrical body. An annular flange for eyepiece lens positioning, an eyepiece that is positioned and held through the flange inside the tubular body, and an annular eyepiece member made of an elastic member attached to the end side of the tubular body. In the eyepiece lens unit of the optical device comprising, the inner peripheral portion of the eye contact member, the inner surface of the flange, and located between the outer peripheral portion of the surface of the eyepiece that faces the inner surface of the flange on both sides. It is characterized in that a ring-shaped bulged portion that elastically contacts is formed.

Further, according to the present invention, an extending portion extending toward the cylindrical body through an inner peripheral portion of the flange is formed in an inner peripheral portion of the eye contact member, and the bulging portion is the extending portion. It is assumed that it is formed at the tip of the part. Further, in the present invention, the eyepiece lens is composed of a plurality of lenses whose optical axes are aligned with each other, and the bulging portion elastically contacts the lens located on the eye contact member side.

Further, according to the present invention, the cylindrical body holds an outer cylinder attached to the main body of the optical device and the eyepiece lens, and an inner peripheral portion of the outer cylinder is arranged in the optical axis direction of the eyepiece lens. It is constituted by an inner cylinder movably connected, and the eye contact member is attached to an end portion side of the inner cylinder. Further, in the present invention, an eyepiece knob is attached to an end portion of the inner cylinder, and the eye contact member is attached to the eyepiece knob. Further, in the present invention, the flange is formed on the eyepiece knob. Further, in the present invention, the eye contact member is formed with a lip portion that elastically contacts the outer peripheral portion of the outer cylinder.

[0010]

Embodiments of the present invention will be described below when applied to an eyepiece unit of a collimating telescope of a surveying instrument. FIG. 1 shows a sectional view of an eyepiece unit of a collimating telescope of a surveying instrument. In FIG. 1, reference numeral 1 denotes a collimation telescope, which includes a main body 3 and an eyepiece unit 5 connected to a rear portion of the main body 3. The main body 3 is arranged in a cylindrical casing 7, an objective lens (not shown) held in the casing 7, a focus position of the objective lens, and a rear end side portion in the casing 7. The focusing screen 9 and the like are formed.
A female screw portion 703 for mounting the eyepiece lens unit 7 is formed on the rear end surface 701 of the housing 7.

The eyepiece lens unit 5 includes a cylindrical outer cylinder 11, a cylindrical inner cylinder 13 arranged inside the outer cylinder 11, and an eyepiece lens 15 held inside the inner cylinder 13.
And an annular eyepiece knob 17 attached to the inner cylinder 13
Further, the eyepiece member 19 attached to the eyepiece knob 17 and the like are provided, and in the embodiment, the outer cylinder 11 and the inner cylinder 13 form a cylindrical body.

A male screw portion 1101 that can be screwed into the female screw portion 703 is formed on one end side of the outer peripheral portion of the outer cylinder 11, and an outer peripheral surface portion 1103 having a uniform diameter is formed on the other end side.
An annular flange 1105 is bulged and formed in the middle portion. A concave portion 1107 is formed around the entire side surface of the flange 1105.
And an O-ring 21 is provided in the recess 1107. A large diameter portion 110 is provided on one end side of the inner peripheral portion of the outer cylinder 11.
9 is formed, and a female screw portion 1111 is formed on the other end side.

The inner cylinder 13 is formed to have a length larger than that of the outer cylinder 11. An annular flange 1301 having an outer diameter slightly smaller than that of the large diameter portion 1109 is bulged and formed at one end of the outer peripheral portion of the inner cylinder 13, and the female screw extends from the other end to a position near the flange 1301. Part 11
A male screw portion 1303 that can be screwed with the screw 11 is formed.
A female screw portion 1305 is formed on one end side of the inner peripheral portion of the inner cylinder 13, and a large diameter portion 1307 is formed on the other end thereof. A lens having a uniform diameter is housed between the female screw portion 1305 and the large diameter portion 1307. A portion 1309 is formed, and an annular pressing ring 1311 that can be screwed into the female screw portion 1305 is provided on the inner peripheral portion on one end side of the inner cylinder 13.

The eyepiece lens 15 comprises three lenses 150.
1, 1503, 1505, and these three lenses 1501, 1503, 1505 are the same as the female screw portion 130.
Before the press ring 1311 is screwed onto the screw 5,
Each of the lenses 1501, 1503 and 1505 is accommodated in the lens accommodating portion 1309 from the inside of the lens 5, and the optical axes L of the lenses 1501, 1503 and 1505 coincide with each other.

The eyepiece knob 17 has an annular shape, and its outer peripheral portion is formed by an outer peripheral surface 1701 having a uniform diameter. A large diameter portion 1703 having an inner diameter larger than that of the outer peripheral surface portion 1103 of the outer cylinder 11 is formed on one end side of the inner peripheral portion of the eyepiece knob 17, and is substantially the same as the outer diameter of the eyepiece lens 17 on the other end side. An annular flange 1705 having an inner diameter of the same size is bulged, and a female screw portion 170 capable of screwing with the male screw portion 1303 of the inner cylinder 13 is provided between the large diameter portion 1703 and the flange 1705.
7 is formed.

The eye contact member 19 is formed of an elastic member such as rubber so as to cover the outside of the eyepiece knob 17. The eye contact member 19 has a peripheral surface portion 1901 fitted to the outer peripheral surface 1701 of the eyepiece knob 17, and the peripheral surface portion 1
An annular lip portion 1903 is provided so as to project radially inward from one end of 901 and elastically contacts the outer peripheral surface portion 1103 of the outer cylinder 11. Further, the eye contact member 19 has the peripheral surface portion 19
01 is provided so as to project radially inward from the other end of the flange 17
No. 05 covering the outer surface 1709 of the collimating telescope 1 and the end surface portion 1905 which is in contact with the user (not shown) of the collimating telescope 1 and the end surface portion 190 while elastically contacting the inner peripheral portion of the flange 1705.
Extending part 190 extending from the inner end of 5 to the eyepiece lens 15 side
7 and an annular expansion that is bulged at the tip of the extended portion 1907 and is capable of elastically contacting the inner side surface 1711 of the flange 1705 and the surface 1505A of the lens 1505 facing the inner side surface 1711 near the outer periphery. A projecting portion 1909 is provided, and a window portion 1911 having an inner diameter smaller than the outer diameter of the lens 1505 is formed inside the extending portion 1907.

Assembling the eyepiece unit 5 is as follows.
Do the following: First, the male screw portion 1303 of the inner cylinder 13 and the female screw portion 1111 of the outer cylinder 11 are screwed so that the flange 1301 is located in the large diameter portion 1109,
The inner cylinder 13 is movably coupled to the inner peripheral portion of the outer cylinder 11 in the optical axis L direction. Further, the eyepiece knob 17 is attached to the eyepiece member 19
Attach. This attachment is performed by bringing the end surface portion 1905 into contact with the outer surface 1709 of the flange 1705 of the eyepiece knob 17 and fitting the peripheral surface portion 1901 to the outer peripheral surface 1701. next,
The eyepiece knob 17 is attached to the end of the inner cylinder 13.
This attachment is performed by screwing the female screw portion 1707 into the male screw portion 1303. In this state, the bulging portion 1909 of the eye contact member 19 is arranged inside the inner side surface 1711 of the flange 1705 in the large diameter portion 1307 of the inner cylinder 13.
Further, the inner peripheral edge of the lip portion 1903 of the eye contact member 19 elastically contacts the outer peripheral surface portion 1103 of the outer cylinder 11. The inner peripheral edge of the lip portion 1903 and the outer peripheral surface portion 1103 of the outer cylinder 11 are
The elastic contact portion and the length of the outer peripheral surface portion 1103 are set so that the elastic contact is always made during the diopter adjustment.

Next, each of the lenses 1505, 1503
1501 are sequentially accommodated in the lens accommodating portion 1309 from the inside of the female screw portion 1305, and the retaining ring 1311 is screwed and tightened to the female screw portion 1305 after the accommodation, and the eyepiece lens system 15 is moved in the optical axis L direction by the retaining ring 1311. Is moved to the other end side of the inner cylinder 13 along. As a result, the portion of the surface 1505A of the lens 1505 located on the other end side, which is closer to the outer periphery, is abutted against the bulging portion 1909 of the eye contact member 19, and the pressing ring 1311 and the bulging portion 1909 allow the eyepiece lens system 15 to move. Are positioned and held in the optical axis L direction.

Next, the assembled eyepiece lens unit 5 is attached to the housing 7 of the main body 3. The eyepiece unit 5 is attached by the flange 1105 of the outer cylinder 11.
The O-ring 21 is disposed in the concave portion 1107 of the outer cylinder 11, and in this state, the male screw portion 1101 of the outer cylinder 11 is connected to the female screw portion 703 of the housing 7.
It is done by screwing on and tightening.

According to this embodiment, the space between the end of the inner cylinder 13 and the lens 1505 is closed by the bulging portion 1909 formed integrally with the eye contact member 19, and the space between them extends to the inside of the housing 7. Intrusion of dust and water is surely prevented. Therefore,
By simply changing the configuration of the eyepiece member 19 provided conventionally, the space between the end of the inner cylinder 13 and the lens 1505 can be closed without using a dedicated seal member, and the number of parts of the eyepiece lens unit 5 and the number of assembly steps can be increased. And the cost of the eyepiece lens unit 5 can be reduced.

Further, the lip portion 1903 of the eye contact member 19
Since the inner peripheral edge of the outer cylinder elastically contacts the outer peripheral surface portion 1103 of the outer cylinder 11 and the space between the outer cylinder 11 and the inner cylinder 13 is closed, the number of parts is not increased at all, and dust and water pass between them and collimate the telescope for collimation. It is possible to prevent the intrusion into the inside of the first casing 7.

Further, by attaching the eyepiece knob 17 to which the eye contact member 19 is attached to the inner cylinder 13, the end portion of the inner cylinder 13 and the lens 1505 are closed, so that a conventional dedicated seal member is used. It is possible to save the troublesome work of assembling it at the end of the body and significantly improve the efficiency of the assembling work.
Further, since the bulging portion 1909 is formed integrally with the eyepiece member 19, when vibration or the like is applied to the eyepiece lens unit 5, compared to the conventional structure in which a dedicated seal member is incorporated, dust and water are prevented. Be advantageous.

In the embodiment, the case where the eyepiece lens 15 is composed of three lenses 1501, 1503 and 1505 has been described, but the eyepiece lens 15 may be composed of one lens or three lenses. It may be composed of a plurality of sheets other than the above. In the embodiment, the lip portion 1903 is formed integrally with the eye contact member 19 and the eyepiece knob 17 and the outer cylinder 11 are closed by the lip portion 1903. However, the lip portion 1903 is omitted and the outer cylinder 11 is omitted. The space between the inner cylinder 13 and the inner cylinder 13 may be closed by other means. Furthermore, in the embodiment, the eyepiece lens unit 5 including the outer cylinder 11 and the inner cylinder 13 has been described, but the present invention is also applicable to an eyepiece lens unit including a single cylinder. Further, in the embodiment, the eyepiece lens unit 5 in the collimating telescope 1 of the surveying instrument has been described as an example, but the present invention can be widely applied to the eyepiece lens unit in other optical devices such as a telescope and a video camera. Needless to say.

[0024]

As described above, according to the present invention, an optical device main body, a cylinder attached to the optical device main body,
An annular flange for positioning an eyepiece lens provided inside and at the end of the tubular body, an eyepiece that is positioned and held through the flange inside the tubular body, and is attached to the end portion side of the tubular body. In an eyepiece lens unit of an optical device including an elastic eyepiece member made of an elastic member, an inner peripheral surface of the eyepiece member, an inner surface of the flange, and a surface of the eyepiece lens facing the inner surface of the flange. An annular bulging portion is formed between the outer peripheral portion and the outer peripheral portion so as to elastically contact both of them. Therefore, it is possible to reliably prevent dust or water from entering the inside of the main body of the optical device from the end portion of the cylindrical body without increasing the number of parts or the number of assembly steps.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an eyepiece lens unit of a collimation telescope of a surveying instrument according to an embodiment of the present invention.

[Explanation of symbols]

 1 Telescope for collimation 3 Main body 5 Eyepiece lens unit 11 Outer cylinder 1103 Outer peripheral surface portion 13 Inner cylinder 15 Eyepiece 1501, 1503, 1505 Lens 1505A Lens surface 17 Eyepiece knob 1705 Flange 1711 Flange inner surface 19 Eye contact member 1903 Lip portion 1907 Extension portion 1909 bulging part L optical axis

Claims (7)

[Claims] 1. An optical device main body, a cylinder attached to the optical device main body, an annular flange for positioning an eyepiece provided at an end portion and inside of the cylinder, and an inside of the cylinder. In the eyepiece lens unit of the optical device, which includes an eyepiece lens that is positioned and held via the flange and an annular eyepiece member that is attached to the end portion side of the tubular body, In the inner peripheral portion, the inner surface of the flange,
An eyepiece lens unit of an optical device, characterized in that an annular bulge portion is formed between the surface of the eyepiece lens facing the inner side surface of the flange and a portion near the outer circumference and elastically contacting both of them. 2. An inner peripheral portion of the eye contact member is formed with an extending portion extending to the cylindrical body side through the inner peripheral portion of the flange, and the bulging portion is provided at a tip of the extending portion. The eyepiece unit of the optical device according to claim 1, which is formed. 3. The optical device according to claim 1, wherein the eyepiece lens is composed of a plurality of lenses whose optical axes match each other, and the bulging portion elastically contacts the lens located on the eyepiece member side. Eyepiece unit. 4. The cylindrical body holds an eyepiece lens and an outer cylinder attached to the optical device body, and is coupled to an inner peripheral portion of the outer cylinder so as to be movable in an optical axis direction of the eyepiece lens. The eyepiece unit for an optical device according to claim 1, 2 or 3, wherein the eyepiece member is attached to an end portion side of the inner cylinder. 5. An eyepiece lens unit for an optical apparatus according to claim 4, wherein an eyepiece knob is attached to an end portion of the inner cylinder, and the eye contact member is attached to the eyepiece knob. 6. The eyepiece lens unit for an optical apparatus according to claim 5, wherein the flange is formed on the eyepiece knob. 7. The eyepiece lens unit for an optical device according to claim 4, wherein the eye contact member is formed with a lip portion that elastically contacts the outer peripheral portion of the outer cylinder.