JPH09197291A - Binoculars - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provided the binoculars which has small variation in operating force quantity due to the direction and position of the movement of an optical system holding frame and also has a small shift of the optical axis. SOLUTION: The binoculars are equipped with two lens frames 1L and 1R which hold an objective optical system and are arranged in parallel so that their optical axes are faced to nearly the same directions, guide shafts 2L and 2R which support those two lens frames 1L and 1R so that they freely move forth and back, an extension member 3 which is applied with a driving force to move the lens frames 1L and 1R forward and backward along the optical axis, and backlash putting springs 5L and 5R which energize the lens frames 1L and 1R in mutually opposite directions. Then the extension member 3 drives the lens frames 1L and 1R, energized by the backlash putting springs 5L and 5R, forward and backward.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to binoculars, and more particularly to a mechanism for feeding out an optical system holding frame of binoculars.

[0002]

2. Description of the Related Art Binoculars having a backlash structure of a lens barrel, which is a conventional optical system holding frame, are disclosed in Japanese Utility Model Publication No.
In the structure of the hanging type binoculars disclosed in Japanese Patent Laid-Open No. 72, the eyepiece frame, which is a movable lens frame, and the guide rod are integrally pressed against the sliding cylinder (feeding member) by the biasing force of the spring. The left and right movable lens frames and the guide rod are structured to be biased in the same direction along the optical axis.

Further, in another conventional structure, as shown in the schematic view of the lens frame extension structure of FIG. 3, both the left and right movable objective lens frames 21L and 21R are backlash springs 25L. , 25R in the direction of the optical axis and in the same direction, the objective lens frame 21L,
The play between 21R and the guide members 22L and 22R, and
The play between the pins 32L and 32R integrally formed with the objective lens frame and the feeding member 23 is eliminated by the biasing force.

That is, in the above-mentioned lens frame drive structure,
The objective lens frames 21L and 21R have guide members 22L and 2L, respectively.
It is supported slidably in the optical axis direction by 2R. And
If the natural length of the backlash springs 25L and 25R is L0 and the spring constant is K, the feeding member 23 shown in FIG.
Since the installation length is L1 in the state of,
The amount of force in the feeding direction acting on the feeding member 23 by the springs 25L and 25R is +2 (L0-L1) K. In the following description, the upward direction is the + direction and the downward direction is the − direction in FIG. 3 and also in FIGS. 1 and 2 described later. Further, the counterclockwise direction is the + direction and the clockwise direction is the − direction.

[0005]

However, in the binoculars lens frame drive structure disclosed in Japanese Utility Model Publication No. 46-33172 and the lens frame drive structure shown in FIG. 3, the feeding member 23 is moved + x. When it is delivered, only the amount of force in the same direction as the delivery direction +2 (L0-L1-
x) When a force of K is exerted and the amount of movement is −x, the amount of force in the direction opposite to the retraction direction is +2 (L
0-L1 + x) K force is working. As described above, the amount of operation force varies depending on whether the direction in which the payout member 23 and the objective lens frames 21L and 21R are moved matches the biasing force direction of the backlash springs 25L and 25R, or the opposite direction.

In addition, a position extended by the movement amount x,
There is a difference of 4 × K in the operation force amount at the position retracted by the movement amount x, and the operation force amount also varies depending on the extended position.

In the lens frame driving structure disclosed in Japanese Utility Model Publication No. 46-33172, since the eyepiece frame and the mirror body are not rattled, it is determined which part the eyepiece frame is tilted by the amount of the rattling. The optical axis is not stable. FIG.
In the conventional structure shown in (1), the backlash causes the optical axis O1 of the objective lens frame 7L to move in the -.theta. Direction.
Further, the optical axis O2 of the objective lens frame 7R is tilted in the + θ direction, and the optical axis is relatively displaced by 2θ which is the sum of the absolute values.

The present invention has been made in order to solve the above-mentioned problems, and the change in the amount of operation force due to the moving direction and position of the optical system holding frame is small. Provide binoculars with little optical axis shift.

[0009]

The binoculars according to claim 1 of the present invention include at least an objective optical system, and two optical systems arranged in parallel so that the optical axes of the objective optical systems are oriented in substantially the same direction. The holding frame, the guide means for supporting the two optical system holding frames so as to move back and forth in the optical axis direction, and the two optical system holding frames, which are connected to each other and receive a driving force,
A feeding member for moving the two optical system holding frames forward and backward along the optical axis direction and a biasing means for biasing the two optical system holding frames in opposite directions are provided. In the binoculars, the optical system holding frame biased by the biasing means is driven forward and backward by the feeding member.

A binocular according to a second aspect of the present invention is the binocular according to the first aspect, wherein the biasing means biases the two optical system holding frames in opposite directions toward the optical axis direction. .

According to a third aspect of the present invention, in the binoculars according to the first aspect, the guide means is composed of a rod-shaped member extending in the optical axis direction.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. First, an outline of a lens extension mechanism for binoculars according to an embodiment of the present invention will be described with reference to the lens extension mechanism diagram of FIG. 1. The lens extension mechanism is a movable optical system mainly for focus adjustment. A guide shaft 2L, which is a holding frame and guide means,
Left and right objective lens frames (hereinafter referred to as lens frames) 1L and 1R slidably supported by 2R, and the lens frame 1
The lens frame 1L, 1R and the guide shafts 2L, 2R are formed by a feeding member 3 which is connected to L, 1R and is driven forward and backward, and is supported by a guide shaft 4, and a compression spring, and the lens frames 1L, 1R. Pins 30L and 30R integrally formed with
And play-out member 3 and play-backing springs 5L and 5R which are biasing means for playing back the play.

The backlash spring 5L is arranged above the lens frame 1L (FIG. 1), and the lens frame 1L is DL.
Biased in the direction. Also, the backlash spring 5R is
The lens frame 1R is disposed below the lens frame 1R (see FIG. 1).
R is biased in the direction opposite to the DL direction. Further, the backlash springs 5L and 5R both have a natural length L0 and a mounting length L1.

In the binoculars of the present embodiment configured as described above, in the state shown in FIG. 1, backlash springs 5L, 5
The urging force acting on the feeding member 3 at the position P0 by R in the feeding direction is 0. When the feeding member 3 is moved in the + direction by the movement amount x, the force amount − (L0
The biasing force of -L1 + x) K is also + (L0 -L1-x) K by the spring 5R via the lens frame 1R.
The urging force of is acting, and the total power is -2xK
The urging force of will work.

Further, when the moving amount x is retracted in the-direction, the force amount- (L0-L1
-X) The urging force of K is also increased by the spring 5R.
The urging force of (L0-L1 + x) K acts, and the urging force of + 2xK acts as the total force. As described above, according to the binoculars of the present embodiment, the total amount of force of the backlash springs 5L and 5R when extended or retracted becomes resistance when the feeding member 3 is moved in the direction opposite to the urging force, When moving in the same direction, the pushing force is applied, but compared with the case of the conventional binoculars in FIG. 3, the biasing force itself is small and the change in the amount of operation force is small.

That is, the forces at the position where the movement amount x is extended and the positions where the movement amount x is extended are the same in absolute value, and the difference between the force amount at the neutral position P0 and the force amount is 2xK. However, in the case of moving from the extended position to the retracted position described above, the change in the absolute value of the force is half and the change in the operation force amount is small as compared with the case of the conventional binoculars in FIG.

Further, the backlash springs 5L and 5R pull the backlash to the lens frames 1L and 1R.
The optical axes O1 and O2 are both tilted in the + θ direction, and the relative change in the optical axis between the left and right can be minimized.

Next, details of the lens extension mechanism of the binoculars of the present embodiment will be described with reference to the lens extension mechanism diagram of FIG. The lens feeding mechanism is a movable optical system holding frame for focus adjustment similar to the mechanism described in FIG. 1, and is attached to the guide shafts 12L and 12R as guide means fixed to the main body 16. Left and right lens frames 11L and 11R slidably supported, and arms 13L and 1L, which are connected to the lens frames 11L and 11R and are slidably supported by the guide shaft 14, respectively.
3R, lens frames 11L and 11R, and guide shafts 12L and 1
The backlash with 2R, the backlash between the pins 31L and 31R integrally formed with the lens frames 11L and 11R and the arms 13L and 13R, and the backlash between the arms 13L and 13R and the guide shaft 14 and the screw portion 17 are loosened. Backlash spring 15L which is a biasing means
, 15R.

A screw portion 17 for adjusting the parallax is fixed to the guide shaft 14, and the screw portion 17 is attached to the arm 13.
It is screwed into R. The end surface of the arm 13L is in contact with the end surface of the screw portion 17. Therefore, the guide shaft 1
By rotating 4, the relative positions of the lens frames 11L and 11R in the optical axis direction are adjusted via the arms 13L and 13R, and the parallax is adjusted.

The backlash springs 15L and 15R are also provided.
Is inserted into the guide shafts 12L and 12R and is assembled in a state of contacting the lens frames 11L and 11R, and biases the lens frames 11L and 11R in the DL and DR directions, respectively. Further, the natural lengths and the mounting lengths of the backlash springs 15L and 15R are the same as those described in FIG. 1, and the same biasing force as described above is applied to the lens frames 11L and 11L.
Give to R.

In the binoculars of the present embodiment configured as described above, when the guide shaft 14 or the screw portion 17 is moved back and forth in the axial direction using a focus adjusting operation member (not shown), the arms 13L, 13R are moved. And lens frame 11L, 11R
Is integrally driven back and forth to adjust the focus.

At this time, the lens frames 11L and 11R and the guide shaft 1 are urged by the urging forces of the backlash springs 15L and 15R.
Play with 2L and 12R, and lens frames 11L and 11R
There is looseness between the arms and the arms 13L and 13R. Moreover, as described in the above-mentioned outline, the amount of operation force of the focus adjusting operation member is little changed depending on the moving direction and position of the lens frame.

Further, the backlash springs 15L and 15R have an effect of pressing the arm 13L and the end surface of the screw portion 17 by the urging force thereof and also loosening the screw backlash between the arm 13R and the screw portion 17. ing. In addition, backlash spring 15L,
As described above, the optical axes O1 and O2 of the lens frames 11L and 11R are tilted in the same + θ direction and the relative change of the optical axis is minimized. You can stop to the limit.

As described above, according to the binoculars of the present embodiment, the backlash of the lens frame is eliminated, and the focus shift is less likely to occur. Moreover, the amount of operation force does not change significantly depending on the direction and position of movement of the lens frame. Further, it is possible to suppress a relative optical axis shift between the left and right lenses due to backlash.

[0025]

As described above, according to the binoculars according to the first aspect of the present invention, the backlash of the optical system holding frame is eliminated, and the occurrence of focus shift can be suppressed. Moreover, the amount of operating force does not change significantly depending on the moving direction and position of the optical system holding frame. Further, it is possible to suppress a relative optical axis shift between the left and right optical system members due to the backlash.

According to the binoculars according to claim 2 of the present invention,
The amount of operation force does not change significantly depending on the moving direction and position of the optical system holding frame. Further, it is possible to suppress a relative optical axis shift between the left and right optical system members due to the backlash.
According to the binoculars of the third aspect of the present invention, the optical system holding frame can be smoothly guided along the optical axis.

[Brief description of drawings]

FIG. 1 is a mechanism diagram showing an outline of a lens extension mechanism of binoculars according to an embodiment of the present invention.

FIG. 2 is a mechanism diagram showing a lens extension mechanism of the binoculars of FIG.

FIG. 3 is a mechanism diagram showing an outline of a lens extension mechanism of conventional binoculars.

[Explanation of symbols]

1L, 11L ... Left objective lens frame (optical system holding frame) 1R, 11R ... Right objective lens frame (optical system holding frame) 2L, 2R, 12L, 12R ... Guide shaft (guide means) 3, 13L, 13R ...... Feeding member 5L, 5R, 15L, 15R …… Playback spring (biasing means)

Claims (3)

[Claims] 1. An optical system holding frame which holds at least an objective optical system and is arranged in parallel so that the optical axes of the objective optical system are oriented in substantially the same direction, and these two optical system holding frames are respectively provided with optical systems. A guide means for supporting the optical system holding frame so as to be movable back and forth in the axial direction; and a feeding member connected to the two optical system holding frames for moving the two optical system holding frames forward and backward in response to a driving force. Binoculars comprising: a biasing unit that biases the two optical system holding frames in opposite directions. 2. The binoculars according to claim 1, wherein the urging means urges the two optical system holding frames in opposite directions toward the optical axis direction. 3. The binoculars according to claim 1, wherein the guide means comprises a rod-shaped member extending in the optical axis direction.