JPH0132013Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a focus adjustment mechanism for binoculars that compensates for the shortcomings of the known center focus adjustment mechanism for binoculars made of a biaxial hinge assembly and further improves ease of use.

Conventionally, the rotational movement of a rotatable focus adjustment knob provided approximately at the center of the substrate is converted into linear movement of the lead shaft, and the horizontal member fixed to one end of the lead shaft is linearly integrated with the lead shaft. By moving it back and forth, the engaging portions at both left and right ends of the horizontal member were fitted into the recessed portions of a transmission rod sliding parallel to the lead shaft, and the tips of the transmission rod were locked to the lens frames of the left and right lens barrels. A focus adjustment mechanism is known, but in this mechanism, the horizontal member exhibits a tilting phenomenon (a phenomenon in which it swings around the lead axis) on the top surface of the substrate due to uneven rotation of the focus adjustment knob and the influence of rotational load. As a reaction to this, there was a problem in that rotational slack was generated in the knob.

For this reason, for example, as in Japanese Utility Model Publication No. 54-3711, a spring member is used in the cross member to prevent the horizontal member from tilting.

However, for biaxially hinged binoculars, which must be small and lightweight, it is strongly desired that the focus adjustment knob be rotated lightly and smoothly.
If the configuration of No. 3711 is applied to this, the cross member will receive the bending stress of the spring member, so a weak spring stress will not prevent the tilt phenomenon, whereas if a strong spring stress is applied, the compressive stress will reduce the transmission. The problem is that the movement of the rod and reed shaft becomes heavy, which in turn makes it difficult to rotate the knob, making it difficult to use.

If it is a large binocular that allows you to set the diameter and length of the knob to a large extent, it is possible to overcome the above disadvantages to some extent, but this is fatal for binoculars that are made of a biaxial hinge assembly that is required to be small and lightweight. It becomes a defect.

The purpose of the present invention is to eliminate the above-mentioned disadvantages and provide a focus adjustment mechanism for binoculars that allows the knob to be rotated lightly and smoothly.

Next, the present invention will be explained with reference to the embodiments shown in the drawings. Reference numeral 1 is a knob for adjusting the focus, 2 is a lead shaft that is screwed into the knob and converts rotational motion into linear motion, and 3 is one end of the lead shaft. fixed cross members, 4
is a screw that fixes the cross member and the lead shaft. Cross member 3
Engaging portions 3a, 3b are formed at both ends of the lead shaft 2, and the engaging portions 3a, 3b fit into concave portions 6a, 6b of transmission rods 5a, 5b sliding in parallel with the lead shaft 2, The fitted state is such that there is no play in the lead axial direction. Furthermore, the ends of the transmission rods 5a, 5b are bent into an L-shape and are engaged with the lens frames 8a, 8b of the left and right lens barrels 7a, 7b, respectively.

Further, reference numeral 9 denotes a substrate, which includes both lens barrels 7a and 7b.
A part or all of the upper surface of the substrate 9 is finished as a flat surface 9a, and a cross member that is above the flat surface 9a and does not intersect with the lead axis 2 Adjustment screw 1 to adjust the play (backlash) between the cross member and the board in the specified position
One or more screws 10 are screwed in, and the height can be adjusted by turning this adjustment screw 10 with a screwdriver.

Furthermore, one end of this adjustment screw 10 comes into contact with the flat surface 9a of the substrate 9 to adjust the play, but at this time, the screwing state is adjusted so that no bending stress is applied to the cross member by the adjustment screw 10. It is sufficient to provide one adjustment screw on one side of the cross member, but if necessary, it is also possible to provide multiple screws at symmetrical positions on the left and right sides of the cross member, or replace one adjustment screw with a pin. Of course it's a good thing.

Note that the reference numeral 11 is a cover for the board.

The present invention has the above-mentioned configuration, and when the knob 1, which is set on the board so that it can only be rotated, is rotated, the lead shaft 2 moves back and forth, and as a result, the cross member 3 fixed to the lead shaft 2 moves into the lead. It moves back and forth integrally with the shaft, and the movement is transmitted to the lens frames 8a, 8b via the engaging portions 3a, 3b and the concave portions 6a, 6b of the transmission rods 5a, 5b, allowing focus adjustment.

Here, in the present invention, since the adjustment screw 10 acts as a spacer between the upper surface of the board and the crosspiece, there is no risk of the crosspiece tilting from side to side using the lead shaft as a fulcrum, and there is no bending of the crosspiece itself. Since no stress is applied, the knob 1 can be rotated lightly and smoothly.

Further, since the portion of the upper surface of the substrate that the adjustment screw 10 contacts is finished to have a flat surface 9a, the adjustment screw 10 can always be in stable contact with the upper surface of the substrate within the range of movement of the lead shaft.

Therefore, the present invention is extremely easy to use as a focus adjustment mechanism for biaxial hinge type binoculars, and has excellent effects such as making it easy to ensure accuracy when assembling the binoculars.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional plan view of binoculars equipped with the present invention, FIG. 2 is a sectional view taken along the line --, and FIG. 3 is an exploded perspective view showing the main parts of the present invention. 1...Knob, 2...Lead shaft, 3...Horizontal material,
3a, 3b...engaging portion, 5a, 5b...transmission rod,
6a, 6b...concave portion, 8a, 8b...lens frame, 9...substrate, 9a...plane, 10...adjustment screw.

Claims (1)

[Scope of Claim for Utility Model Registration] In the central focus adjustment mechanism of two-axis hinged binoculars that transmits motion to the lens frame via the focus adjustment knob, lead shaft, crosspiece, and transmission rod, the central focus adjustment mechanism is located below the crosspiece. At least a part of the upper surface of the substrate is formed into a flat surface, and an adjusting screw is screwed into a predetermined position of the cross member above the plane and not intersecting the lead axis, and one end of the adjusting screw applies bending stress to the cross member. A focus adjustment mechanism for binoculars, characterized in that the focus adjustment mechanism is configured to come into contact with the plane without causing any damage.