JPH0224089Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial field of application The present invention relates to a diopter correction device that is provided separately from a focus adjustment device in order to obtain left and right clear vision images in binoculars, and in particular, the invention relates to a diopter correction device that is provided separately from a focus adjustment device in order to obtain left and right clear vision images in binoculars. The present invention relates to a diopter correction device for binoculars that perform focus adjustment.

BACKGROUND TECHNOLOGY Binoculars are equipped with the same optical system on the left and right sides, and a pair of left and right objective lenses or eyepieces are moved forward and backward in the optical axis direction using a focus adjustment device, so that the object to be read can be clearly seen. It is configured. However, since the binoculars user's left and right visual acuity is usually not the same, it is common to be unable to obtain clear images of both the left and right sides even if the focus adjustment described above is performed.
For this reason, in order to obtain a diopter suitable for the eyes of binocular users, a diopter correction device separate from the above-mentioned focus adjustment device has been provided, and either the pair of left and right objective lenses or the eyepiece lenses have been adjusted. Adjustments are made by moving one side forward and backward in the optical axis direction. In recent years, many binoculars have been provided with the above-mentioned diopter correction device on the eyepiece side in consideration of operability and miniaturization.

However, in the case of zoom binoculars, if only one of the pair of eyepieces is moved back and forth in the optical axis direction, the optical characteristics will change, resulting in an undesirable result of decreased performance. Although it is possible to compensate for this structurally, the structure is inevitably complicated, and the number of adjustment steps during manufacturing increases, resulting in high costs.

For this reason, devices disclosed in, for example, Japanese Patent Application Laid-open No. 115142/1982 and Japanese Utility Model Application No. 30310/1983 have been proposed as a means of providing a diopter correction device on the objective lens side while achieving miniaturization.

Problems to be solved with the invention However, in the above-mentioned Japanese Patent Application Laid-open No. 115142/1983,
Since the operating part is located on the bridge side of one objective lens, there is a risk of blocking the view with your fingertips, etc. when operating it, and the small knob must be rotated, making it difficult to operate. It has the disadvantage of being inferior.

Furthermore, in the above-mentioned Japanese Utility Model Application Publication No. 56-30310, the operation part was provided near the eyepiece of the connecting part, so the operability was improved, but there was a drawback that the structure was extremely complicated.

The present invention eliminates these conventional drawbacks and
It is an object of the present invention to provide a diopter correction device provided on an objective lens side, which is superior in operability, has a simple configuration, and can be miniaturized.

Means for solving the problem One of the pair of left and right objective lens frames 10 and 11 10
A straight groove 1 extending parallel to the optical axis on the outer peripheral surface of
4, and a spiral groove 12 that extends obliquely and is inclined at a predetermined angle with respect to the optical axis. On the other hand, a diopter correction ring 15 is rotatably fitted into the mirror body 1 in which the objective lens frame 10 is built, and a screw pin 17 is provided on the diopter correction ring 15. It engages with the straight groove 14. Further, a blade piece 6 which is a connecting pin connected to a blade 5 which is a focus adjusting member movable in the optical axis direction is engaged with the spiral groove 12.

Operation When correcting the diopter, the diopter correction ring 15 is rotated, and the screw pin 17 that moves together with the ring rotates the objective lens frame 10 through the straight groove 14, and the blade piece 6 and the spiral groove are rotated. 12, the objective lens frame 10 is moved forward and backward while being rotated in the optical axis direction. On the other hand, during focus adjustment, as the diopter correction ring 15 rotates, the blade 5 is The objective lens frame 1 moves forward and backward in the optical axis direction.
0 moves forward and backward in the optical axis direction in a pair with the other objective lens frame 11.

Embodiments Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Here, Fig. 1 is a partial cross-sectional side view showing the inside of the mirror body equipped with this device, Fig. 2 is a plan view of the main part, and Fig. 3 is a direct view of the pin provided on the diopter correction ring. A second diagram showing the respective engagement states of the shaped groove and the blade piece and the spiral groove.
FIG. 4 is a sectional view taken along the line A--A in the figure, and a plan view of an objective lens frame provided with grooves, which is a part of the present device.

As shown in FIGS. 1 and 2, a joint 3 that supports a pair of left and right mirror bodies 1 and 2 on both sides so as to be able to rotate within a certain range has a rotatable wheel 4 in the center near its tip. is supported by In addition, a blade 5 serving as a focusing member is supported by known means so as to move toward and away from the tip end surface of the coupling portion 3 in accordance with the rotation of the wheel 4. At both ends of the blade 5, blade pieces 6 and 7, which are connecting pins, are rotatably supported. It protrudes into each mirror body 1, 2 by loosely penetrating long holes 8, 9 which are transparently provided in parallel with the mirror body. As is clear from FIGS. 1 and 3, objective lens frames 10 and 11 to which objective lenses (not shown) are fixed are slidably inserted into the tip portions of each mirror body 1 and 2. has been done. A spiral groove 12 that extends obliquely and is inclined at a predetermined angle with respect to the optical axis l is bored in the outer periphery of one of the objective lens frames 10 and 11 (see FIG. 4). The tip of the aforementioned feather piece 6 is thrust into engagement with this spiral groove 12. Further, a round hole 13 is bored in the outer periphery of the other objective lens frame 11, and the tip of the aforementioned vane piece 7 is thrust into this round hole 13 and engaged.

As is clear from FIGS. 1 and 4, the pair of objective lens frames 10 are provided with a straight groove 14 extending parallel to the optical axis l. Further, on the outer periphery of the mirror body 1 into which the objective lens frame 10 is inserted, as shown in FIGS. 1 to 3, a diopter correction ring 15 is positioned perpendicular to the straight groove 14 and rotates. It is inserted freely. An operation knob 16 is fixed to the outside of the mirror body 1 in the diopter correction ring 15, that is, on the opposite side to the mirror body 2, by a screw pin 17, and the tip of the screw pin 17 is inserted into the straight groove 14 in the mirror body 1. It passes through a through hole 18 that is perpendicular to the straight groove 14 and engages in the straight groove 14. The screw pin 1
The diameter of the tip of the groove 7 and the width of the straight groove 14 are formed to be almost the same.

Since this embodiment is constructed as described above, when the diopter correction ring 15 is rotated using the operating knob 16, the screw pin 17 is fitted into the straight groove 14, so that the objective lens frame 10 is moved in the same direction. is rotated.
Since the blade piece 6 is engaged with the spiral groove 12, this engagement relationship causes the objective lens frame 1 to
0 rotates, moving forward and backward in the optical axis direction according to the direction of rotation, and diopter correction is performed. The amount of movement during this forward and backward movement is determined by the degree of inclination of the spiral groove 12 with respect to the optical axis l and the amount of rotation of the diopter correction ring 15.

On the other hand, to adjust the focus, the wheel 4 may be rotated in a desired direction. Then, depending on the direction and amount of rotation of the wheel 4, the blades 5 move toward and away from the coupling portion 3, and accordingly, the blade pieces 6 and 7 move in the same direction, that is, in the optical axis direction. At this time, feather pieces 6
is engaged with the spiral groove 12 as described above, but since the screw pin 17 is engaged with the straight groove 14, the objective lens frame 10 cannot rotate. Therefore, while maintaining the positional relationship between the blade piece 6 and the spiral groove 12 adjusted by the screw pin 17 and the straight groove 14, the screw pin 17 is guided by the straight groove 14 and moves. , objective lens frame 1
0 moves forward and backward in the optical axis direction without rotating. The objective lens frame 10 is moved forward and backward in the optical axis direction integrally with the objective lens frame 11 by moving each of the blade pieces 6 and 7 by the same amount in the same direction.

Effects of the Invention As is clear from the above explanation, according to the present invention, an operating part such as an operating knob can be provided in a desired part of the diopter correction ring, so operability is improved and the field of view is obstructed during operation. In addition to the fact that the binoculars are not restricted, the structure is simple, and the binoculars can be made smaller.

[Brief explanation of drawings]

The figures show a preferred embodiment of the present invention, with Fig. 1 being a partially sectional side view showing the interior of the mirror body in which the present device is installed;
3 is a sectional view taken along line A--A in FIG. 2, and FIG. 4 is a plan view of an objective lens frame which is a part of the apparatus. 1, 2... Mirror body, 5... Blade, 6, 7... Wing piece, 10, 11... Objective lens frame, 12... Spiral groove, 14... Straight groove, 15... Diopter correction ring , 16...operation knob, 17...screw pin.

Claims (1)

[Scope of utility model registration request] In binoculars in which a pair of objective lens frames built in a pair of left and right mirror bodies are connected to a focus adjustment member that is movable in the optical axis direction, a pair of objective lens frames extending parallel to the optical axis is provided on the outer circumferential surface of one of the pair of objective lens frames. A straight groove and a spiral groove extending diagonally with respect to the optical axis are provided, and the straight groove is engaged with a pin provided in a diopter correction ring rotatably fitted to the corresponding mirror body. . A diopter correction device for binoculars, wherein the spiral groove is engaged with a connecting pin connected to a focus adjustment member.