JPS6258482B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a device for instantaneously adjusting the focus of binoculars.

Conventional binocular instant focus adjustment devices use a cam mechanism to rapidly slide the eyepiece in the axial direction. For example, the device of Utility Model Publication No. 53-46029 has a central shaft to which the left and right eyepieces are attached, a hollow shaft to which the upper and lower arms of the left and right mirrors are attached, and a device that is rotatably fitted into the hollow shaft. The cam pin installed in the central shaft is inserted into the steeply inclined cam groove provided in the operating barrel through the axial guide hole provided in the hollow shaft, and the operating barrel is rotated approximately 30 degrees. The focus can be adjusted by just using the lens. However, this type of cam mechanism cannot eliminate bumps, which causes backlash and lacks smooth movement.In addition, the cam groove has a steep slope, so even when a slight external force is applied, For example, simply pressing the eyepiece against the eye caused the device to move and cause the device to become out of focus.

In general, variations in the composite focus due to dimensional errors of lenses, prisms, etc. are unavoidable; for example, 50
The tolerance according to the JIS standard for binoculars with a magnification of 7 mm is +1.3.
mm, becomes −2.6 mm. If this error is smaller than the difference between the maximum movable length and the required movable length of the eyepiece, it will be absorbed, but since the difference between the maximum movable length and the required movable length is only about 0.5 mm, a composite focus error of 0.5 mm or more In order to correct this, the conventional device had the disadvantage that it was necessary to insert a washer or the like for adjustment.

The object of the invention is to provide an instantaneous focusing device which does not have the above-mentioned drawbacks.

In order to achieve the above object, the device of the present invention has a hollow shaft connecting the left and right mirror bodies, a circumferential guide hole provided in the hollow shaft, an operating cylinder fitted in the hollow shaft, and a shaft inserted into the hollow shaft. A central shaft, a connecting pin that passes through the guide hole and connects the operating cylinder and the central shaft, a multi-thread female thread provided on the head of the central shaft, and a multi-thread female thread that engages with the multi-thread female thread. Consisting of a sliding shaft with a threaded portion and left and right eyepieces connected via the sliding shaft, just by slightly turning the operating cylinder, the eyepieces can be moved to the desired location through multi-thread engagement. The focus is adjusted by sliding the lens over a long distance.

As shown in FIGS. 1 to 3, which explain the apparatus of the present invention based on the embodiment shown in the drawings, the upper and lower arms 2, 2', 3, 3' of the left and right mirror bodies 1, 1' are hollow. They are mutually rotatably connected via a shaft 4 and a washer 5. The hollow shaft 4 is integrally fixed to one arm 2 by a set screw 6 and a set screw 7. A guide hole 8 with a center angle of 45° or less is bored on the circumference at approximately the center of the hollow shaft 4.

An operation cylinder 9 is attached to the hollow shaft 4 between the upper and lower arms 2 and 2'.
Rotatably fit the connecting pin 10 into the operation cylinder.
Screw in. The connecting pin 10 is connected to the guide hole 8 of the hollow shaft 4.
penetrate. A cover 11 is attached to the surface of the operating cylinder 9 from above the connecting pin 10 with adhesive or the like to prevent the connecting pin 10 from coming off.

A central shaft 12 is coaxially and rotatably inserted into the hollow shaft 4, and the tip of the connecting pin 10 is inserted into a radial pin hole 13 formed in the central shaft. The neck 14 of the central shaft 12 protrudes from the hollow shaft 4, a head 15 is fitted into the neck, and a plurality of setscrews 16 reaching the circumferential groove of the neck 14 are screwed in from the circumference of the neck to secure the head 15.
is integrally fixed to the neck portion 14.

The multi-thread male threaded portion 19 at the center of the sliding shaft 18 is threadedly engaged with the multi-thread female threaded portion 17 of the head 15, and the sliding shaft 1
Insert the lower end shaft portion 20 of No. 8 into the guide shaft hole 21 of the neck portion 14. It is desirable that the length of the multi-thread female thread section 17 be at least twice the length of the multi-thread external thread section 19.

The left and right eyepieces 22, 22' are inserted into the mirror bodies 1, 1' so that they can move forward and backward in the axial direction, and their arms 2
3 and 23' are rotatably connected to each other via a connecting portion 25 of the sliding shaft 18. A cap 24 is screwed to the upper end of the sliding shaft 18.

As shown in FIG. 3, the connecting pin 1 of the operation cylinder 9
Hollow shaft 4 is hidden by cover 11 on the lower side of 0.
Drill a screw hole 26 that reaches the
Insert the coil spring 28 and the adjustment screw 29. The elasticity of the coil spring 28 is adjusted by the adjustment screw 29 to adjust the pressing force of the ball 27 against the hollow shaft 4.

Next, the focus adjustment operation of the apparatus of the present invention will be explained. The operation cylinder 9 instantly rotates within the center angle of the guide hole 8 of the hollow shaft 4. The central shaft 12 also rotates together with the operating cylinder 9 via the connecting pin 10. When the head 15 of the central shaft 12 rotates, the sliding shaft 18 having the multi-thread male thread 19 engaged with the multi-thread female thread 17 advances or retreats in the axial direction. As the sliding shaft 18 moves forward and backward, the eyepiece 2 integrated therewith
2 and 22' move forward and backward relative to the mirror bodies 1 and 1' in the optical axis direction, and the focus of the binoculars is instantaneously adjusted.

The leads of the multi-thread male thread part 19 and the multi-thread female thread part 17 make the sliding distance of the sliding shaft 18 slightly longer than the required movable length for focus adjustment when the operating barrel 9 is turned to its maximum limit. It is set as follows. For example, the sliding distance is set to 5 mm for the required movable length of 4 mm. In this case, if the error in the composite focus is 1 mm or more, conventionally it was necessary to fit a washer or the like for adjustment, but the device of the present invention fixes the head 15 by loosening the setscrew 16 of the head 15. By changing the angular position, the relative position of the sliding shaft 18, that is, the eyepiece 22
Since the relative position of the lens to the mirror body 1 is adjusted, correction of the composite focus error is extremely easy.

The multi-thread female thread part 17 and the multi-thread male thread part 19 are screwed together without backlash, and there is no play in the connecting pin 10 between the operating cylinder 9 and the central shaft 12, so the operating cylinder 9 can be moved quickly. The movement of the sliding shaft 18 back and forth by rotational operation, that is, the focus adjustment of the binoculars, is very smooth and does not cause any rattling, unlike a conventional cam mechanism that has bumps. Furthermore, the screw engagement of the device of the present invention is more stable than the conventional steeply inclined cam mechanism, and the eyepiece 22 will not sink into the mirror body 1 with the force of pressing it against the eye. . Furthermore, by adjusting the screw 29, even if a stronger force is applied to the eyepiece 22, the eyepiece will not sink into the mirror body 1.

As described above, in the device of the present invention, the focus adjustment operation is smooth and does not give a feeling of wobbling, and the eyepiece section has good stability after adjustment. Furthermore, errors in the composite focus can be easily corrected by simply adjusting the fixed angular position of the head on the central axis.

[Brief explanation of the drawing]

FIG. 1 is an elevational view of binoculars equipped with a device according to an embodiment of the present invention, FIG. 2 is an enlarged sectional view of the shaft portion of FIG. 1, and FIG. 3 is an exploded view of the device of FIG. 1. . 1: Mirror body, 2, 3: Arm, 4: Hollow shaft, 8: Guide hole, 9: Operation barrel, 10: Connecting pin, 12: Central shaft, 14: Neck, 15: Head, 17: Multi-strip Female thread part, 18: Sliding shaft, 19: Multi-thread male thread part, 20:
Lower end shaft portion, 21: Guide shaft hole, 22: Eyepiece portion, 2
3: Arm.

Claims (1)

[Claims] 1. In binoculars in which the focus is adjusted by moving the eyepiece section forward and backward from the mirror body, a hollow shaft is fixed to the upper and lower arms of one of the left and right mirror bodies, and the upper and lower arms of the other mirror body are fixed to the hollow shaft. an arm is rotatably attached, an operating barrel is rotatably attached between the upper and lower arms of the hollow shaft, a center shaft is rotatably inserted into the hollow shaft, and a guide hole extending in the circumferential direction is formed in the hollow shaft. a multi-thread female screw portion is provided in a shaft hole of the head of the central shaft protruding from the hollow shaft, and a multi-thread male screw portion of a sliding shaft to be inserted into the shaft hole is engaged with the multi-thread female screw portion. a guide shaft hole for guiding the lower end shaft portion of the sliding shaft in the neck portion below the head;
An instant focus adjustment device for binoculars, characterized in that arms of left and right eyepieces are attached to the sliding shaft. 2. The instantaneous focus adjustment device for binoculars according to claim 1, characterized in that the head of the central axis is fixed to the neck so that the rotational angle position can be adjusted. 3. A screw hole is drilled in the operation cylinder that reaches the hollow shaft, a ball and a coil spring are inserted into the screw hole, and an adjustment screw is fitted so that the pressing force of the ball against the hollow shaft can be adjusted. An instantaneous focus adjustment device for binoculars according to claim 1 or 2.