JPH0669921U - Ground telescope - Google Patents

Abstract

(57) [Summary] [Structure] As a focusing mechanism, an objective tube 14 having a linear groove 33 parallel to the optical axis, an eyepiece body 18 to which the objective tube is screwed and fixed, and an objective tube 14 fitted inside the objective tube 14. And is slidable in the direction of the optical axis, and is fitted on the outside of the objective tube 14 and the condenser lens holding tube 12 in which a guide pin 13 that penetrates the linear groove of the objective tube is erected at one location on the outer periphery, Guide pin 13
Has a spiral groove 34 with which the tip of the hollow tube fits, and is rotatable around the optical axis, and the hollow groove 15 is fitted to the outside of the hollow cylinder to cover the spiral groove 34 and is fixed to the hollow cylinder 15. Fixed cylinder 1
6 and a ring 17 made of rubber attached to the fixed barrel 16 so as to cover the fixed barrel and the hollow barrel 15 as a whole. [Effect] The shape of the member forming the focus mechanism can be simplified, and the number of parts can be reduced.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a ground telescope.

[0002]

[Prior art]

 FIG. 2 is a sectional view of a cam mechanism (focus mechanism) mainly for focus adjustment of the conventional ground telescope.

The illustrated portion includes an objective barrel 14, an eyepiece body 28 to which the objective barrel 14 is screwed and fixed, a condenser lens holding barrel 12, and a focus mechanism section 30. The focusing mechanism section 30 moves the focusing lens holding tube 12 back and forth along the optical axis 31 by rotating the focus adjusting section 30 about the optical axis 31 with respect to the objective tube 14. . The condenser lens holding cylinder 12 holds the condenser lens 11.

The focus mechanism section 30 includes a part of the objective cylinder 14, a part of the condenser lens holding cylinder 12, a hollow cylinder 20, a fixed cylinder 24, and an operation cylinder 23. A guide pin 13 is erected at one position on the outer circumference of the end of the condenser lens holding cylinder 12 on the objective cylinder 14 side. The objective tube 14 has a linear groove 33, which is fitted to the outside of the condenser lens holding tube 12 in a portion close to the eyepiece body 28 and in which the guide pin 13 can move smoothly, is parallel to the optical axis. Further, the hollow cylinder 20 is fitted to the outside of the objective cylinder 14 at a portion close to the eyepiece body 28. The hollow cylinder 20 has a spiral groove 34 in which the guide pin 13 penetrating the straight groove 33 is slidably movable, and can smoothly rotate about the optical axis with respect to the objective cylinder 14. The front and rear ends of the hollow cylinder 20 are in contact with the shoulder of the objective cylinder 14 and the end of the eyepiece body 28 so as not to move in the optical axis direction. A fixed cylinder 24 is fitted on the outer side of the hollow cylinder 20 and covers the spiral groove 34. The fixed cylinder 24 is fixed to the hollow cylinder 20 at the end on the eyepiece body 28 side with a fastening screw 10. On the outside of the hollow cylinder 20, an operation cylinder 23 having a concavo-convex surface is fixed so as to be easily rotated by a user.

When the operation tube 23 is rotated about the optical axis, the hollow tube 20 is also rotated, and the spiral groove 34 of the hollow tube 20 moves the guide pin 13 along the linear groove 33 in a direction corresponding to the direction of rotation, that is, Move to the front (left side of the figure) or backward (right side of the figure). As a result, the condenser lens holding cylinder 12 with the guide pin erected can move forward or backward with respect to the objective cylinder 14, and desired focus adjustment can be performed.

[0006]

[Problems to be solved by the device]

 By the way, in the conventional configuration of FIG. 2, the space before and after the condenser lens 11 of the condenser lens holding cylinder 12 is an airtight closed space to prevent clouding of the lens, etc., so that moisture and moisture do not enter from the outside. Need to do so.

In the conventional configuration, the hole of the fastening screw 10, the spiral groove 34 of the hollow cylinder 20, and the groove 33 immediately before the objective cylinder 14 may cause the ingress of moisture from the outside. Therefore, one O-ring 21 and one O-ring 21 are provided between the outer peripheral surface of the objective cylinder 14 and the inner peripheral surface of the hollow cylinder 20 at both ends of the linear groove 33 of the objective cylinder 14. This O-ring fits into a groove provided on the outer peripheral surface of the objective cylinder 14 so as not to come off. The pair of O-rings 21 and 26 prevent moisture from entering the straight groove 33 from the outside. Similarly, on both ends of the spiral groove 34 of the hollow cylinder 20, one O-ring 22 and one O ring are provided between the outer peripheral surface of the hollow cylinder 20 and the inner peripheral surface of the fixed cylinder 24. This O-ring is fitted in a groove provided on the outer peripheral surface of the hollow cylinder 20. O-rings 22 and 25 prevent moisture from entering the spiral groove 34 from the outside. The O-rings 25 and 26 prevent water from entering the spiral groove 34 and the straight groove 33 through the gap between the fixed cylinder 24 and the eyepiece body 28, and also prevent water from entering through the screw holes of the fastening screw 10. Further, an O-ring 27 is provided at the front end of the eyepiece body 28 between the inner peripheral surface thereof and the outer peripheral surface of the objective tube 14. This is to prevent water from entering the inside of the eyepiece body 28 through the gap between the fixing tube 24 and the eyepiece body 28 and the screw hole of the fastening screw 10.

Further, in the conventional configuration, a part of the front of the hollow cylinder 20 and a part of the rear of the fixed cylinder 24 are exposed to the outside, so that it is necessary to form a beautiful appearance. That is, since these form the external parts, the shape of the member becomes complicated, and storage and handling are required in the manufacturing process. Together with this, the total number of O-rings is not small as mentioned above, and the total cost of terrestrial telescopes was not necessarily low. Further, since the fastening screw 10 is exposed to the outside, it is not preferable in appearance.

Therefore, the present invention is to provide a more inexpensive terrestrial telescope by simplifying the member shape of the focus mechanism and reducing the number of parts.

[0010]

[Means for Solving the Problems]

 The terrestrial telescope according to the present invention is characterized by having the following members as a focus mechanism.

An objective tube having a straight groove parallel to the optical axis, an eyepiece body to which the objective tube is screwed and fixed, and an inside of the objective tube that is slidable in the optical axis direction and has an outer circumference. A condensing lens holding cylinder in which a guide pin penetrating the linear groove of the objective cylinder is erected at a position, and a spiral groove fitted to the outside of the objective cylinder and fitted with the tip of the guide pin. A hollow cylinder rotatable around the optical axis, a fixed cylinder fitted to the outside of the hollow cylinder to cover the spiral groove and fixed to the hollow cylinder, and the fixed cylinder and the hollow cylinder as a whole. A rubber ring attached to the fixed cylinder so as to cover it.

[0012]

[Action]

 In the present invention, since the rubber ring is attached to the fixed barrel so as to cover the entire fixed barrel and the hollow barrel, the fixed barrel and the hollow barrel no longer form the appearance. Therefore, it is no longer necessary to consider the aesthetics of the shapes of these parts, the shapes can be simplified, and the handling in the manufacturing process does not need to be as careful as before. Further, the fastening screw can also be hidden by the rubber ring.

Further, the number of O-rings on the eyepiece side is reduced by moving the arrangement position of the fastening screw for fixing the fixed cylinder to the hollow cylinder to the objective side and devising the arrangement position of the O-ring on the eyepiece body side. It will be possible.

As described above, according to the present invention, the total cost of the terrestrial telescope can be reduced by simplifying the member shape and reducing the number of parts.

[0015]

【Example】

 FIG. 1 is a cross-sectional view of the focus mechanism section of the ground telescope of the present invention. The same members as those shown in FIG. 2 have the same reference numerals.

The operation of the focus mechanism section 30 of the present embodiment is similar to that of the conventional one shown in FIG. 2, and the condensing lens holding barrel 12 is moved back and forth by the rotation operation of the focus section 30. However, the specific configuration of each member is different from the conventional one. Hereinafter, different points will be mainly described, and description of the same points will be omitted.

The main points different from the conventional configuration are that the shape of each member constituting the focus mechanism 30 is simplified, the number of O-rings is reduced, and the position of the fastening screw 10 is changed. That is, a rubber focus ring 17 is provided in place of the operation tube 23.

Differences from the conventional configuration will be specifically described. First, the conventional eyepiece body 28 was changed to the eyepiece body 18. The objective tube 14 is screwed and fixed to the eyepiece body 18 as in the conventional case. The hollow cylinder 20 having the conventional spiral groove 34 is changed to the hollow cylinder 15. The hollow cylinder 15 does not have a portion that constitutes an outer appearance portion unlike the conventional hollow cylinder 20. The conventional fixed cylinder 24 is changed to the fixed cylinder 16. The new fixed barrel 16 is fixed to the hollow barrel 15 by a fastening screw 10 at one position on the objective barrel 14 side unlike the conventional one. The fixed cylinder 16 also does not have a portion that forms the external appearance of the conventional fixed cylinder 24. That is, the entire outer circumference of the hollow cylinder 15 is covered with the fixed cylinder 16, and the entire outer peripheral surface of the fixed cylinder 16 is covered and attached with the rubber focus ring 17. Therefore, the screw hole of the fastening screw 10 is also hidden by the focus ring 17 and cannot be seen from the outside. Therefore, it is not necessary to provide the hollow cylinder 15 and the fixed cylinder 16 with a beautiful appearance, and the handling at the time of manufacturing thereof does not need to be as careful as before.

Further, on the eyepiece body 28 side of the objective barrel 14, the O-ring 26 provided between the outer peripheral surface of the objective barrel 14 and the inner peripheral surface of the hollow barrel 20, and the inner peripheral surface of the eyepiece body 28 and the objective barrel. The O-ring 27 provided between the outer peripheral surface of 14 was deleted. Further, the O-ring 25 provided between the outer peripheral surface of the hollow cylinder 20 and the inner peripheral surface of the fixed cylinder 24 on the eyepiece body 28 side was also deleted. Instead of these, a new O-ring 7 is provided between the hollow cylinder 15 and the eyepiece body 18 at the abutting portion between the hollow cylinder 15 and the inner peripheral surface of the fixed cylinder 16. Compared with the conventional configuration, the O-ring is arranged at the abutting portion of the hollow cylinder 15 and the eyepiece body 18, and the fastening screw 10 is moved to the objective cylinder 14 side. It has become possible to replace 26 and 27 with a new O-ring 7, 1. On the objective cylinder 14 side, the O-ring 21 provided between the outer peripheral surface of the objective cylinder 14 and the inner peripheral surface of the hollow cylinder 20, and the outer peripheral surface of the hollow cylinder 20 and the inner peripheral surface of the fixed cylinder 24 are provided. With respect to the O-ring 22 provided between them, O-rings 8 and 9 were provided as the corresponding ones. The O-ring 8 is provided in a radial gap between the objective cylinder 14 and the hollow cylinder 15, and the O-ring 9 is provided in a groove formed on the outer peripheral fitting surface of the hollow cylinder 15. The functions of the O-rings 8 and 9 follow the functions of the O-rings 21 and 22. Although the fastening screw 10 is newly provided on the objective tube 14 side, since the screw hole is covered and covered by the rubber focus ring 17, the possibility of water vapor entering through the screw hole is reduced, and even if it enters, Blocked by O-rings 8 and 9.

Further, in this embodiment, a low friction type O-ring is adopted. Such a low-friction type rubber is, for example, a nitrile rubber having a compound number 1180-70 manufactured by Mitsubishi Cable Industries, Ltd. This makes it possible to increase the amount of crushing of the O-ring by reducing the space for accommodating the O-ring or by increasing the thickness of the O-ring as compared with the conventional case. As a result, it is possible to improve the airtightness of the internal closed space even with respect to the eccentricity of each cylinder while maintaining an appropriate torque.

[0021]

[Effect of device]

 According to the present invention, it is possible to simplify the shape of the members constituting the focus mechanism and reduce the number of parts, and it is possible to provide an inexpensive focus mechanism and thus a terrestrial telescope.

[Brief description of drawings]

FIG. 1 is a sectional view of a focus mechanism portion of a ground telescope according to the present invention.

FIG. 2 is a cross-sectional view of a focus mechanism section of a conventional telescope.

[Explanation of symbols]

7, 8, 9 ... O-ring, 10 ... Fastening screw, 11 ... Focusing lens, 12 ... Focusing lens holding cylinder, 13 ... Guide pin, 14
... objective tube, 15 ... hollow tube, 16 ... fixed tube, 17 ... focus ring, 18 ... eyepiece body, 20 ... hollow tube 21,22
... O-ring, 23 ... Operation tube, 24 ... Fixed tube, 25, 2
6, 27 ... O-ring, 28 ... Eyepiece body, 30 ... Focus mechanism, 31 ... Optical axis, 33 ... Straight groove, 34 ... Spiral groove.

Claims (3)

[Scope of utility model registration request] 1. A terrestrial telescope comprising the following members as a focus mechanism. An objective tube having a linear groove parallel to the optical axis, an eyepiece body to which the objective tube is screwed and fixed, and an inside of the objective tube that is slidable in the optical axis direction and is located at one position on the outer circumference. It has a condenser lens holding cylinder in which a guide pin penetrating the linear groove of the objective cylinder is erected, and a spiral groove fitted to the outside of the objective cylinder and fitted with the tip of the guide pin. A hollow cylinder that can rotate as a center, a fixed cylinder that fits on the outside of the hollow cylinder and covers the spiral groove, and is fixed to the hollow cylinder, and a fixed cylinder and the entire hollow cylinder. A rubber ring attached to the fixed cylinder. 2. The fixing cylinder is fixed to the hollow cylinder by a fastening screw and has the fastening screw at a front end portion, and the fastening screw is covered and hidden by the rubber ring. The ground telescope according to claim 1. 3. A first O-ring arranged between the objective screw and the hollow cylinder between the fastening screw and the linear groove, and between the fastening screw and the linear groove, A second O-ring arranged between the hollow cylinder and the fixed cylinder, and a third O-ring arranged between the hollow cylinder and the inner peripheral surface of the fixed cylinder at the boundary between the eyepiece body. The ground telescope according to claim 2, further comprising an O-ring.