JPH0412486Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a focusing device for binoculars.

[Problems to be solved by conventional technology and ideas] Conventional focus adjustment devices for binoculars use a screw mechanism to move the feeding shaft up and down. Insert the protruding cylinder shaft into the center shaft, provide a threaded part on the inner cylinder of this cylinder shaft, provide a threaded part at the lower end of the feeding shaft, and connect the threaded part of the feeding shaft and the threaded part of the adjustment knob's cylinder shaft. However, the threaded portion of the feeding shaft and the threaded portion of the cylindrical shaft of the adjustment knob are provided as a single thread with a loose pitch. Focus adjustment is extremely slow, and it is necessary to rotate the adjustment knob many times in order to move the eyepiece from the upper eye to the lower limit, and there are various problems associated with rotating the adjustment knob. There were flaws. Furthermore, in such a conventional focusing device using a screw mechanism, it is extremely difficult to form steep pitch screws on the center axis, adjustment knob, and lever shaft due to its structure.

A focus adjustment device according to Utility Model Registration No. 1399822 has been proposed as a device that eliminates the slow operation in focus adjustment using the conventional screw mechanism as described above. However, since this device uses a method in which the cam pin provided on the camshaft is guided by an inclined elongated hole provided on the central shaft, even if the delivery shaft can be moved up and down rapidly, the delivery shaft remains fixed. It has the disadvantage of being extremely weak. For example, the weight of the eyepiece barrel may cause the extension shaft to fall naturally, or if the eyepiece barrel makes slight contact with your face during observation, the extension shaft may move and cause the focus to go out of focus. Once the focus has been set, it is easy to lose focus, such as when the feeding shaft easily falls when operating the eye hood, and it is necessary to perform focus adjustment operations frequently, which is extremely troublesome. The tendency for the focal point to change due to the lack of fixation force of the feed-out shaft was a fatal flaw for binoculars.

The present invention was devised in view of such problems with the conventional technology, and its purpose is to adopt a screw mechanism to connect the central axis, adjustment knob, and lever axis from the cylindrical axis. forming a focusing device whose parts can be provided by molding as a structure with the addition of a lever cam consisting of:
This makes it possible to instantly adjust the focus by simply rotating the adjustment knob slightly, and at the same time, to stably maintain the focused state.

This invention uses molding to advance 30 mm in one rotation, that is, the lead is 30 mm, for example, the thread diameter is 8 mm, and the lead angle is 50 mm.
As a result, we have made it possible to provide a lever cam with a 12-thread thread, and as a result, a lever cam with a multi-thread thread that advances 30 mm in one rotation with respect to the central axis, adjustment knob, and lever shaft. , the focus can be adjusted by simply rotating the adjustment knob slightly.

The present invention uses a screw mechanism to provide a focus adjustment mechanism that is formed into an assembly structure of a lever cam and a knob provided between the upper and lower bearings of the binocular body, making it possible to instantly adjust the focus. In particular, by providing a lever cam, the lever cam is formed into a structure including a central shaft, an adjustment knob, and a cylindrical shaft to the lever shaft, and the adjustment knob is positioned between the upper and lower bearings of the binocular body, In order to improve visibility when focusing instantaneously, the eyepiece and objective lens are arranged within the effective diameter range of the pupil diameter specified in the JIS standard.

The present invention provides a focus adjustment device that employs a screw mechanism, and as a result, secures the fixation of the lever shaft, that is, the fixation and holding power of the focus of the eyepiece lens.

[Means for Solving the Problems] An example of the implementation of the present invention will be described below with reference to the drawings.The focus adjustment mechanism of the binoculars S includes a lever cam 2 rotatably inserted into the inner cylinder of the central shaft 1 consisting of a cylinder shaft. At the same time, insert the adjustment knob 3 into the outer cylinder of the central shaft 1, pass through the horizontally long hole 4 in the central shaft 1, and screw the lever cam 2 and adjustment knob 3 through the horizontally long hole 4 of the central shaft 1 with the screw 5. The lever shaft 7 is connected by screws, and the threaded part 8 of the lever shaft 7 is screwed into the threaded part 6 provided in the inner cylinder of the lever cam 2.

The central shaft 1 has a flange portion 9 at the upper end and a threaded portion 10 at the lower end of the inner cylinder, and the upper and lower bearings 12, 12' of the binocular bodies 11, 11' are pivotally mounted, The set screw 13 is screwed onto the threaded portion 10.

The adjustment knob 3 is installed between the upper and lower bearings 12, 12' of the binoculars 11, 11', and the adjustment knob 3 and the lever cam 2 are connected by screws 5 through the horizontally long hole 4 of the central shaft 1. Then, the lever cam 2 and the lever shaft 7 are assembled by screwing together the screw portions 6 and 8, and the distance between the eyepiece and the objective lens is kept within the effective range of the pupil diameter of the JIS standard.

The lever cam 2 is formed as a cylindrical shaft body, the threaded portion 6 is provided downward from the upper end of the inner cylinder, and the lower part of the lever cam 2 is formed with a screw hole 14 into which the screw 5 is screwed. The threaded portion 6 of this lever cam 2 is designed to advance 30 mm in one rotation, that is, to form a lead of 30 mm, for example, a thread diameter of 8 mm, a lead angle of 50 degrees, a 12 thread thread, and a thread angle of 60 degrees. preferable.
Further, it is preferable that this lever cam 2 is cast by molding.

The lever shaft 7 has a flange portion 1 for supporting the connecting rods 16, 16' of the eyepiece barrels 15, 15'.
7, and the lower threaded portion 8 is formed with a lead screw corresponding to the threaded portion 6 of the lever cam 2, and is screwed into the threaded portion 6 of the lever cam 2.

As shown in FIGS. 4 to 6, the adjustment knob 3 is provided with an annular body part 20 that has a space 19 in the outer extension of the cylindrical shaft part 18 and extends about half a circumference, and this annular body part 20
is formed with a flat portion 21 of a predetermined width on the front surface. That is, the annular body part 20 is formed with circular parts 20a and 20a' on the left and right sides with the plane part 21 in between, and a plurality of grooves are provided on the outer circumferential surface of the circular parts 20a and 20a' for preventing stumbling. 22 is engraved.
Further, it is preferable that the flat portion 21 is formed in a concave shape.

[Operation] Since the present invention has the above-described configuration, when the adjustment knob 3 is rotated, the lever cam 2, which is integrally connected by the screw 5, is rotated in conjunction with the rotation of the adjustment knob 3. Since the threaded portion 6 of the lever cam 2 and the threaded portion 8 of the lever shaft 7 are screwed together, the lever shaft 7 is moved up and down as the lever cam 2 rotates.

Since the lever cam 2 is formed as a cylindrical shaft, a steep pitch multi-thread thread such as a 12-thread thread with a lead of 30 mm, for example, a lead of 50 degrees, can be easily formed in the inner cylinder of the lever cam 2.
In addition, the lever cam 2 has an extremely simple shape, and the threaded portion 6 is formed to have the minimum necessary size and shape to be screwed into the threaded portion 8 of the lever shaft 7, thereby ensuring the desired accuracy of the threaded portion 6. It is formed. Then, by providing the lever cam 2, the adjustment knob 3 is set at a position between the upper and lower bearings 12, 12' of the binocular bodies 11, 11', and the cylinder is aligned with the central axis 1, the adjustment knob 3, and the lever shaft 7. We have realized the provision of a focus adjustment device that is assembled into a structure including a lever cam 2 consisting of a shaft and that keeps the distance between the eyepiece and objective lens within the effective diameter range of the pupil diameter of the JIS standard,
The focus can be adjusted by slightly rotating the adjustment knob 3 using the lever cam 2, which has a threaded portion 6 that advances 30 mm per rotation, and furthermore, the vertical movement of the lever shaft 7 is smooth due to the adoption of a lead screw. Not only can the lever shaft 7 be fixedly held, but the focus once determined will not go awry.

[Effects of the invention] Therefore, the present invention provides a component that has only the minimum number of screws necessary for raising and lowering the lever shaft, thereby making the structure as short as possible. By making it possible to easily provide a lever cam provided with a screw, and assembling this lever cam as a component with a knob located between the upper and lower bearings of the binocular body, a focus adjustment device employing a screw mechanism is provided. And, this focus adjustment device uses a lever cam with a threaded part equipped with a steep pitch multi-thread screw that advances 30 mm in one rotation, making it possible to instantly adjust the focus by simply turning the adjustment knob. rather than keeping the focus fixed,
In other words, the focus may be easily lost due to the eyepiece barrel falling naturally or simply touching your face during observation, or the eyepiece barrel may move when you move the binocular body. Moreover, the operation of the lever shaft during focus adjustment is extremely smooth.Furthermore, the focus adjustment mechanism has a structure in which the adjustment knob is positioned between the upper and lower bearings of the binocular body, so that the eyepiece and objective lenses can be easily adjusted. This distance is within the effective diameter range of the pupil diameter defined by the JIS standard, and as a result, the focus adjustment device of the present invention can be used and formed in binoculars of various magnifications.

[Brief explanation of the drawing]

The figures relate to the present invention: Fig. 1 is a front view of the binoculars showing a partial cross section of the focus adjustment mechanism, Fig. 2 is an enlarged sectional view of the main part showing the focus adjustment mechanism assembled, and Fig. 3 is an exploded cross section thereof. Figure 4 is a front view of the adjustment knob,
FIG. 5 is a right side view thereof, and FIG. 6 is a plan view thereof. 1... Central shaft, 2... Lever cam, 3... Adjustment knob, 4... Horizontal oblong hole, 5... Screw, 6... Threaded part, 7... Lever shaft, 8... Screwed part.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A central shaft that becomes a cylindrical shaft and is formed by piercing a horizontally elongated hole in the lower part, and a screw that becomes a cylindrical shaft and has a steeply pitched multi-thread screw in its inner cylinder. a lever cam formed with a section and inserted into the central shaft; an adjustment knob inserted into the outer cylinder of the central shaft; and the lever cam and adjustment knob are screwed together through a horizontally elongated hole in the central shaft. A focus adjustment device for binoculars, which is constructed by connecting the lever shaft in a freely interlocking manner to the threaded part of the lever cam. (2) The focus adjustment device for binoculars according to claim 1, wherein the screw portion provided in the inner cylinder of the lever cam has a lead screw that advances approximately 30 mm in one rotation.