JP2577927B2 - Telescope focusing mechanism - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a focusing mechanism for a telescope (herein, monocular and binoculars having a relatively short focal length), and in particular, to a method of selecting a plurality of operation members. The present invention relates to a focusing mechanism of a telescope that can perform stepwise focusing, for example, focusing in three steps of a long distance, a middle distance, and a short distance by selectively selecting and operating the focusing.

2. Description of the Related Art Conventionally, the focus adjustment mechanism of this type of telescope is performed by adjusting the distance between an eyepiece and an objective lens. Mechanism for adjusting the lever by reciprocating operation and mechanism for adjusting by pushing the push button (Japanese Utility Model No. 58-34)
No. 410) is known.

In each of these prior arts, the operation is adjusted so that the user can best see the desired object while actually looking into the telescope.

Problems to be Solved by the Invention Therefore, in the conventional focus adjustment mechanism, in any operation method, since it is necessary to actually perform while watching the object, for example, at the time of birdwatching, When a bird suddenly appears, there is a drawback that the focus cannot be quickly adjusted in a very short time due to a wrong operation direction of the focus adjustment mechanism or an excessive operation.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a telescope focusing mechanism that eliminates such disadvantages.

Means for Solving the Problems According to the present invention, when an object scene is imaged through a lens, there is an unsharp circle (a range of allowable blur) that is allowed according to the focal length of the lens. The image is not blurred even if the lens is moved back and forth, but if the lens is kept at a certain position, an allowable sharp image exists before and after the lens on the image plane, based on the optical characteristics. Things. That is, in binoculars or monoculars having a short focal length, the lens is connected to one of the objective lens and the eyepiece and is movable so as to relatively change the distance between the two lenses. A moving mechanism having a plurality of insertion portions arranged in a position, and provided so as to correspond one-to-one to each of the insertion portions without being shifted from each other in the moving direction of the movement mechanism, and to each of the corresponding insertion portions. A plurality of operating members which can be inserted into and removed from the operating member, and a guide portion provided relative to each of the operating members and the respective insertion portions. The moving mechanism is moved by a certain distance according to the selected operation member.

By selectively selecting and operating a plurality of operation members, one of the objective lens and the eyepiece is moved by the moving mechanism to a position determined according to the arrangement position of each operation member. The moving blur range of the lens is sequentially shifted step by step, and a multi-step focus is provided so that a scene from a long distance to a short distance or from a short distance to a long distance can be continuously read. It is for making adjustments.

Embodiment Hereinafter, a preferred embodiment in a case where the present invention is applied to binoculars will be described in detail with reference to the accompanying drawings.

1 is a perspective view showing the overall appearance, FIG. 2 is a cross-sectional view partially showing the relationship between a moving mechanism and a push button as an operation member, and FIG. 3 is a view showing the moving mechanism and an objective lens frame. FIG. 4 is a perspective view showing a connected state, FIG. 4 is a partial sectional view showing a regulating member for regulating the support plate, and FIG. 5 is a plan view of the support plate for supporting the push button.

As shown in FIG. 1, the upper portions of three push buttons 4a, 4b, and 4c, which are operation members for performing focus adjustment, are exposed on the upper surface of the coupling arm 3 supported on the mirror bodies 1 and 2 on both sides. Through hole 5 (second
(See the figure) is provided. The cover 6 displays a symbol 7a representing a short distance, a symbol 7b representing a medium distance, and a symbol 7c representing a long distance corresponding to the respective push buttons 4a, 4b, 4c. That is, the push button 4a is for a short distance (for example, about 17 to 30m), the push button 4b is for a medium distance (for example, about 30m to 80m), and the push button 4c is for a long distance (for example, about 80m to infinity). These push buttons 4a, 4b, 4c are arranged in a horizontal row. A part of the wheel 8 for adjusting the focus and the diopter is exposed from the cover 6.

As shown in FIG. 1 to FIG.
A blade 11 is integrally provided at the tip of a sliding plate 10 slidably disposed in the front-rear direction.
It is located protruding from. A pair of objective lens frames 13 (only one side is shown) provided with an objective lens (not shown) are connected to both sides of the blade 11 via a blade piece 12. The objective lens frame 13 is built in together with a pair of eyepiece frames (not shown) in which the mirror bodies 1 and 2 are provided with a pair of eyepiece lenses. The focus adjustment is performed by moving in the optical axis direction and changing the distance between each objective lens and each eyepiece in each of the mirror bodies 1 and 2.

As shown in FIGS. 2 to 4, a positioning portion of a positioning plate 14 slidably mounted on the sliding plate 10 in the front-rear direction.
15 is provided with three rectangular insertion holes 16a, 16b, 16c, which are insertion portions shifted from each other in the front-rear direction. That is, the insertion hole 16c is located closest to the blade 11, and then becomes farther in the order of the insertion hole 16b and the insertion hole 16a. And
Each of the insertion holes 16a, 16b, 16c has a leg 17 (shown only with respect to the push button 4b) formed with a slope 17a, 17b serving as a guide for the push buttons 4a, 4b, 4c corresponding thereto. When guided and inserted into the slopes 17a, 17b, the positioning plate 1
4 moves with the sliding plate 10 to a predetermined position determined for each of the push buttons 4a, 4b, 4c, and is positioned and fixed.

As can be understood from FIGS. 2 and 4, a convex portion 19 having a fitting hole 18 is provided at the rear end of the sliding plate 10, while a female screw portion 20 is provided at the rear end of the positioning plate 14. , The convex portion 19
Is located in the square through hole 21 of the positioning plate 14. Then, at the time of rotation 22 in which a male screw is engraved on the peripheral surface except for the small diameter portion at the tip, the female screw portion 20 is screwed and penetrated, and the fitting hole 18 is further rotatably penetrated in the small diameter portion. An E-ring 23 is fixed to the penetrating end. Therefore, although the rotating shaft 22 is rotatable,
The axial movement is restricted by the E-ring 23. The sliding plate 10 and the positioning plate are
14 will be connected. A disc 24 is provided at the rear end of the rotating shaft 22, and a notch 25 is formed therein. A pin 26 fixed to the wheel 8 is fitted in the notch 25. The rolling wheel 8 is rotatably supported by the connecting arm 3 via a shaft 27 passing therethrough.

The moving mechanism is constituted by the sliding plate 10 and the positioning plate 14 connected to each other by the rotating shaft 22 described above.

As shown in FIG. 5, the elastic supporting plate 28 supporting each of the push buttons 4a, 4b, 4c is screwed to the cover member 6 at the mounting holes 29a, 29b. It has three support pieces 31a, 31b, 31c through which support holes 30a, 30b, 30c for supporting the push buttons 4a, 4b, 4c, respectively. As shown by phantom lines in FIG. 2, the support pieces 31a, 31b, and 31c are normally warped upward at normal times, and when the supporting push buttons 4a, 4b, and 4c are pushed in, As shown in a solid line state in FIG. 2, it is displaced in a substantially horizontal state. Then, the support pieces 31a, 31b, 31
c has a restoring force for returning to the original state (virtual line state).

The above-mentioned displacement is attached to the connecting arm 3 shown in FIGS. 2 and 4 so as to bendable in a counterclockwise direction in FIG. 2 and is urged by a spring 32 so that it can return in the clockwise direction in FIG. The adjustment is performed while pushing the regulated plate 33 against the urging force of the spring 32. Then, when the tip of the support piece, for example, the support piece 31a passes through the bent head portion 34 of the control plate 33 and becomes horizontal, the pressing force against the control plate 33 is released, and the control plate 33 is released. Is returned to the original position, the leading end of the support piece 31a is locked to the lower end of the head 34 and cannot be returned. As described above, in the process of displacing one support piece 31a in the horizontal state, the other support piece 3
When the heads 1b and 31c are locked to the head 34, the locked state is released and the original state is restored by pushing the head 34.

Next, the focus adjustment operation in the above-described embodiment will be described. However, since the focus adjustment operations of the short distance, the medium distance, and the long distance can be similarly performed, only the case where the focus adjustment is performed on the object at the medium distance will be described. I do.

When the middle distance push button 4b located in the middle is pushed in, the slopes 17a, 17b formed on the leg 17 of the push button 4b are pushed.
Of the positioning plate 14 in the front-back direction (optical axis direction)
The leg 17 is surely guided into the insertion hole 16b even when the corresponding insertion hole 16b is not at a predetermined position. When the support piece 31b is pushed and displaced to the head 34 of the regulating plate 33, the leg 17 is fitted into the insertion hole 16b, and the support piece 31b is in a horizontal state and the head 34
The positioning plate 14 is moved to a predetermined position and becomes immovable. By the movement of the positioning plate 14, the push plate 10 also moves by the same amount, and the objective lens frame 13 also moves by the same amount with the blade 11, so that the focus is adjusted to a medium-range object scene. Will be.

Here, when the rotating wheel 8 is rotated, the rotating shaft 22 is rotated, so that the sliding plate 10 is moved with respect to the positioning plate 14 in the immovable state, and the objective lens frame 13 is further moved to be used. It is possible to obtain a clear vision state suitable for the diopter of the person. The positional relationship between the positioning plate 14 and the sliding plate 10 is invariable unless the wheel 8 is rotated.
Even when the focus is adjusted on a short-range or long-range object scene by pressing the 4a and 4c, the clear vision state suitable for the diopter of the user can be maintained.

If the disk 35 provided on the rear side of the wheel 8 is marked and the corresponding part of the connecting arm 3 is similarly marked,
By matching each mark at the position of the wheel 8 where the clear vision state is obtained, even when the wheel 8 is rotated by use of another person,
If the wheel 8 is rotated so that the respective marks again coincide, a desired clear visual state can be obtained again. Further, when all the push buttons 4a, 4b, 4c are pushed in at the same time, in order to return the respective support pieces 31a, 31b, 31c, a member having a slope below the tip of the head 34 of the regulating plate 33 is required. A mating projection is provided, and one of the ends of each support piece 31a, 31b, 31c is pushed down by pressing the corresponding push button 4a, 4b, 4c, thereby engaging with the slope of the engaging projection. The control plate 33 may be configured to be displaced against the urging force of the spring 32. Furthermore, the number of push buttons 4a, 4b, 4c is not limited to three, but can be changed according to the number of steps for performing focus adjustment. Furthermore, the guide portion is not limited to the slope, and in addition to the push buttons 4a, 4b, 4c, not the insertion holes 16a, 16b, 16c.
It may be provided in c. Furthermore, the present invention can be applied not only to binoculars but also to monoculars, and may be configured to move an eyepiece instead of an objective lens. in this way,
The present invention is not limited to the above-described embodiment, and many modifications can be made.

Effect As is apparent from the above description, according to the present invention, since a multi-step focus adjustment can be performed with a simple operation, a superior effect that the focus adjustment for a desired scene can be immediately performed is achieved. Can be played.

[Brief description of the drawings]

FIG. 1 shows a preferred embodiment in which the present invention is applied to binoculars. FIG. 1 is a perspective view showing the overall appearance, and FIG. 2 is a partly omitted illustration showing the relationship between a moving mechanism and a push button as an operation member. FIG. 3 is a perspective view showing a connection state between the moving mechanism and the objective lens frame, FIG. 4 is a partial sectional view showing a regulating member for regulating the support plate, and FIG. 5 is a support plate for supporting the push button. FIG. 1,2 ... Mirror, 3 ... Connection arm, 4a, 4b, 4c ... Push button, 8 ... Roller, 10 ... Sliding plate, 11 ... Blade, 13 ... Object lens frame, 14 ... Positioning plates, 16a, 16b, 16c ... Insertion holes, 19 ... Protrusions, 20 ... Female threads, 22 ... Rotary shaft, 28 ...
… Support plate, 31a, 32b, 32c …… Support piece, 33 …… Regulation plate

Claims (1)

(57) [Claims] 1. A plurality of inserts connected to one of an objective lens and an eyepiece so as to be movable so as to relatively change a distance between the two lenses, and to be displaced from each other in a moving direction. A moving mechanism having a portion,
A plurality of operating members that are provided so as to correspond one-to-one to the respective insertion portions without being shifted from each other in the moving direction of the moving mechanism, and are detachably inserted into the corresponding respective insertion portions, By providing these operation members and a guide portion provided relatively to each of the insertion portions, by selectively selecting the operation members and inserting them into the insertion portions,
A focus adjusting mechanism for a telescope, wherein the moving mechanism is configured to move the moving mechanism by a predetermined distance according to a selected operation member.