JPH0260161B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a focus adjustment device for binoculars that adjusts the focus by moving the eyepiece lenses of the binoculars forward and backward in the optical axis direction.

[Conventional technology]

BACKGROUND ART Conventionally, there has been a focus adjustment device for binoculars that uses a cam mechanism to adjust the position of the eyepiece lens to adjust the focus (Kokoku No. 53-46029).

As shown in FIG. 4, the focus adjustment device of this binocular includes a connecting rod 6A that connects the left and right eyepieces,
6B, and has a column 20 having a pin 20C protruding in the radial direction near the other end. Moreover, it has an elongated hole 21B that accommodates the column 20 therein, allows the pin 20C to protrude outside, and supports the column 20 so as to be slidable in the axial direction when the column 20 is rotated, and has a pair of binocular bodies. It is provided with a tube body 21 which is pivotally connected. Furthermore, the above pin 20
A focusing cylinder 22 has an inclined guide hole 22A for moving C in an oblique direction, is rotatably attached to the outer periphery of the tube 21, and has integrally formed wings 22B for operation. This is a focus adjustment device for binoculars.

To use this, the focusing cylinder 22 is rotated by pressing the operating blade 22B. Then, the pin 2 engaged with the guide hole 22A
0C moves in the diagonal direction, and the column 20 with the protruding pin 20C also moves in the diagonal direction, so the connecting rods 6A and 6B that fix the column 20 move forward and backward in the optical axis direction, and accordingly. The left and right eyepieces then move forward and backward in the direction of the optical axis to adjust the focus.

[Problem that the invention seeks to solve]

Incidentally, since the focus of the binoculars is adjusted while the eyes are closed, it is necessary to adjust the focus by operating the rotation angle as small as possible. Therefore, when performing operations using a cam mechanism as in the past, the angle between the optical axis direction and the line along the guide hole 22A of the cam mechanism, or when performing focus adjustment using a screw mechanism, It is convenient for the complementary angle of the lead angle of the screw to be as small as possible. This is because the eyepiece can be moved largely by operating a small rotation angle.

However, when viewing with binoculars, you press your eyes lightly against the eyepieces. Therefore, in a focusing device that allows the eyepiece to be moved greatly by operating a small rotation angle, the eyepiece tends to move in the optical axis direction depending on the intraocular pressure during use, making it difficult to adjust the focus position. This makes it easy to shift.

Although the present invention increases the pressure at which the eyepiece begins to move due to intraocular pressure compared to the conventional method, it does not increase the rotation angle required for operation compared to the conventional method, and does not sacrifice the ease of rotation operation. The purpose of this invention is to provide a focus adjustment device that does not require any adjustment.

[Technical means to solve problems]

The present invention includes a cylindrical body 7 having one end fixed to a connecting rod 6A, 6B that connects the left and right eyepieces 2A, 2B, and having a female thread with a relatively large pitch on its inner peripheral surface;
A rod body 8 having a male thread on its shaft portion 8C and screwed into the other end of the cylinder body 7, and having a pin 9C protruding in the radial direction on its end portion 8A, and a binocular body 1.
A, 1B are connected, and the inclined cam hole 9B
A tubular body 9 in which the pin 9C is made to protrude to the outer periphery and the rod 8 is rotatably housed therein, and a long hole 10 that supports the pin 9C so as to be slidable in the axial direction.
This is a focus adjustment device for binoculars having a focus adjustment barrel 10 rotatably attached to the outer periphery of the tube body 9.

〔Example〕

The subscriber number according to the present invention will be explained. As shown in FIGS. 1 to 3, 1A and 1B are binocular bodies, 2A and 2B are eyepieces, and 3A and 3B are lens barrels connected to the eyepieces 2A and 2B. 1B so as to be slidable. 6A, 6B are both eyepieces 2A,
Connecting rod connecting 2B, 4A, 4B, 5A, 5B
is a shaft bearing piece for a pivot attached to the binocular bodies 1A, 1B. 7 connects its upper end to the left and right eyepieces 2.
It is a cylindrical body that is attached via a set screw 11 to the overlapping connection portion of the connecting rods 6A and 6B that connect A and 2B. Reference numeral 7A is a flange attached to the upper end of the cylindrical body 7, and is for stabilizing the overlapping connection portion of the connecting rods 6A and 6B. A female thread with a relatively large pitch is provided on the inner peripheral surface of the cylinder 7 and opens at the lower end. 8 has a male thread on the shaft portion 8C and is screwed into the lower end of the cylinder 7, and a pin 9 protrudes in the radial direction from the end portion 8A.
It is a rod body with a pin hole 8B for attaching C.

9 is a tubular body having a flange 9A formed at its upper end, a cutout groove 9D provided in the flange 9A, and an inclined cam hole 9B near its lower end. Also,
The tube body 9 is pivotally connected to the binocular bodies 1A, 1B via their bearing pieces 4A, 4B, 5A, 5B, and the focus adjustment cylinder 10 is attached to the axis bearing pieces 4A, 4B and the bearing piece 5.
It is rotatably supported so as to be located between A and 5B. A retaining pin 14 protruding in the axial direction from the bearing piece 4A is engaged with the notch groove 9D to prevent rotation of the tube body 9 itself.

A set screw 12 is screwed into the lower end of the tubular body 9 to attach the tubular body 9 to the bearing pieces 5A, 5B to prevent the tubular body 9 from being pulled out. 15 is a cover body for hiding the flange 9A of the tube body 9. Reference numeral 10 denotes a focusing cylinder integrally formed with a wing piece 10B for operation, and the above-mentioned pin 9C is located approximately at the center of the front surface of the cylinder.
It has a long hole 10A that slidably supports the tube body 9 in the axial direction, and is rotatably attached to the outer periphery of the tube body 9. Reference numeral 10C denotes a cover plate that is fitted onto the front portion of the focusing cylinder 10 to hide the elongated hole 10A. 13 are bearing pieces 4A, 4B and 5A, 5
This is a washer interposed at each polymerization part of B. Further, the rod 8 screwed into the cylinder 7 is rotatably housed inside the tube 9, and the pin 9C protruding from the outer periphery of the rod 8 is engaged with the cam hole 9B and the elongated hole 10A.

To use this, when the blade 10B is pressed in the state shown in FIGS.
The pin 9C engaged with 0A attempts to rotate in a plane perpendicular to the optical axis. At this time, since the pin 9C also engages with the inclined cam hole 9B provided in the tube body 9, which is prevented from rotating, the pin 9C also moves in the optical axis direction according to the inclined cam hole 9B. Long hole 10 because it moves
It also moves upwards at A. Then, the rod 8 to which the pin 9C is attached also rotates in a direction perpendicular to the optical axis while moving upward in the optical axis direction. The eyepiece lens connected to the cylinder body 7 is extended by the sum of the length of the upward movement in the optical axis direction and the length of the upward movement of the cylinder body 7 in the optical axis direction caused by the rotation of the rod body 8. It will move in the direction of the optical axis.

〔Effect of the invention〕

Generally, in order to reduce the movement of the eyepiece due to the force in the optical axis direction due to intraocular pressure, the angle between the optical axis direction and the line along the cam hole of the cam mechanism should be made close to a right angle, or the eyepiece should be difficult to move. It is necessary.

However, the former method unnecessarily increases the amount of rotational operation, making it difficult to handle, and the latter method hinders ease of operation.

In contrast, the present invention provides binoculars that, when the maximum movement length of the eyepiece in the optical axis direction is kept constant, the binoculars user can operate the binoculars without increasing the rotation angle or sacrificing the ease of operation. This makes it more difficult for the eyepiece to move due to force in the optical axis direction due to intraocular pressure.

This is because the focus is not adjusted using only a cam mechanism as in the conventional case, but is adjusted using a combination of a cam mechanism and a screw mechanism. By this,
The length of movement of the eyepiece in the optical axis direction, which is shared by each mechanism, can be made shorter than in the past. Therefore, without increasing the rotation angle in the operating direction perpendicular to the optical axis direction, the angle between the optical axis direction and the line along the cam hole of the cam mechanism and the complementary angle of the lead angle of the screw of the screw mechanism can be compared. By increasing the target, it is possible to reduce the component of intraocular pressure, which is a force applied in the optical axis direction, in the sliding direction along the cam hole or screw thread. That is, this makes it possible to reduce movement of the eyepiece due to intraocular pressure. On the other hand, for the force applied for focus adjustment, that is, the force applied in the direction perpendicular to the optical axis direction, the component in the sliding direction along the cam hole or screw thread becomes larger, which is the main reason. The invention does not impede ease of operation.

In this way, the present invention improves the stability of focus adjustment by reducing the movement of the eyepiece against the force in the optical axis direction due to intraocular pressure, without increasing the rotation angle or impairing the ease of operation. It will increase it.

[Brief explanation of drawings]

Fig. 1 is a front view of binoculars equipped with a device according to an embodiment of the present invention, Fig. 2 is a longitudinal sectional view of the binoculars equipped with a device according to an embodiment of the present invention, and Fig. 3 is a front view of binoculars equipped with a device according to an embodiment of the present invention. Exploded view of the device. FIG. 4 is an exploded view of a conventional device. 1A, 1B... Binocular body, 2A, 2B... Eyepiece, 3A, 3B... Lens barrel, 4A, 4B...
Bearing piece, 5A, 5B... Bearing piece, 6A, 6B...
Connecting rod, 7... cylinder, 7A... flange, 8...
Rod body, 8A... end, 8B... pin hole, 8C...
Shaft portion, 9...pipe body, 9A...flange, 9B...
Cam hole, 9C...pin, 9D...notch groove, 10...
...Focus adjustment cylinder, 10A...Long hole, 10B...
Wing piece, 10C... Lid plate, 11... Set screw, 12
... Set screw, 13... Washer, 14... Set pin, 15... Cover body.

Claims (1)

[Claims] 1 A cylindrical body 7 whose one end is fixed to the connecting rods 6A and 6B that connect the left and right eyepieces 2A and 2B, and which has a relatively large female thread on its inner peripheral surface, and a shaft portion 8C.
a rod body 8 having a male screw threaded therein from the other end of the cylinder body 7 and having a pin 9C protruding in the radial direction at its end portion 8A;
The pin 9C is protruded from the inclined cam hole 9B to the outer periphery, and the rod 8 is rotatably housed inside the tubular body 9, and the pin 9C is supported so as to be slidable in the axial direction. A focusing device for binoculars comprising a focusing barrel 10 having a long hole 10A and rotatably attached to the outer periphery of the tubular body 9.