JPH10123402A - Monocular - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a monocular the optical axis of which is stable even in a state where an optical system is extended and which can be compactly housed. SOLUTION: This monocular is provided with an objective frame 7 and an objective holder 6 holding an objective lens group 12 and an ocular frame 3 holding an ocular group 10, and the ocular frame 3 can move from an infinity side to a close range side by slide-driving. By operating and turning a distance knob 2 when the ocular frame 3 is at a slide-driving position, the holder 6 supporting the lens group 12 is driven to advance and retreat through a cam mechanism and focusing from the infinity to the close range is performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to monoculars, and more particularly to monoculars in which an objective optical system and an eyepiece optical system can move forward and backward.

[0002]

2. Description of the Related Art As conventional monoculars capable of adjusting the focus,
The monocular shown in FIGS. 10A and 10B in a sectional view in which the focus is adjusted to infinity and close-up is an objective frame 10 that holds an objective lens group 109 that can move forward and backward in the optical axis O direction.
2 and eyepiece frame 103 holding eyepiece lens group 107
, A prism optical system 108 composed of prisms 108a and 108b, and an eyepiece rubber 105 are incorporated in the main body 101.

[0003] Focus adjustment in the above-mentioned conventional monocular is performed by:
This is performed by moving the objective frame 102. As the drive adjustment mechanism, for example, a slide mechanism or a helicoid mechanism (not shown) is used. Note that the focus adjustment may be performed by moving the eyepiece frame 103 side with respect to the objective frame 102.

[0004]

However, in the above-mentioned monocular having a built-in focus adjusting mechanism, if the amount of extension of the objective lens group is increased, the fitting length between the monocular main body 101 and the objective frame 102 is increased. Since it is necessary to secure the length, there is a problem that the total length at the time of storage becomes long. In addition, if the fitting length between the monocular body 101 and the objective frame 102 is not sufficiently long, there is a problem that the optical axis O on the close side is not stable. For example, in the state of FIG. 10B, the stopper 102a of the objective frame 102 is
In this state, the fitting length is short, and the optical axis O becomes unstable.

[0005] The present invention has been made in view of the above circumstances, and the optical axis is stable even when the optical system is extended.
It is another object of the present invention to provide a monocular that can be stored compactly.

[0006]

According to a first aspect of the present invention, there is provided a monocular including an objective frame holding an objective optical system, an eyepiece frame holding an eyepiece optical system, and the eyepiece frame being independent of the eyepiece frame. It has a first drive mechanism for moving the objective frame in the optical axis direction and a second drive mechanism for moving the eyepiece frame in the optical axis direction independently of the objective frame. In the monocular, the objective frame is driven by the first drive mechanism, the eyepiece frame is driven by the second drive mechanism, and an optical system adjustment such as a focus adjustment is performed by moving each optical system forward and backward. .

According to a second aspect of the present invention, in the monocular according to the first aspect, at least one of the first and second driving mechanisms has a cam means, and The objective frame or the eyepiece frame is driven by the means.

According to a third aspect of the present invention, there is provided a monocular, wherein the objective optical system, the eyepiece optical system, and the first eyepiece optical system are movable independently of the eyepiece optical system in the optical axis direction. A drive mechanism, and a second drive mechanism that enables the eyepiece optical system to move in the optical axis direction independently of the objective optical system.
In the monoculars, the first and second driving mechanisms move the objective optical system, and
The movement amounts of the eyepiece optical systems act to complement each other when performing optical adjustment.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing the appearance of the monocular according to the first embodiment of the present invention. In the monocular of the present embodiment, each lens frame and mechanism members are covered by an upper cover 1 and a lower cover 5 which also serve as a main body on the upper and lower sides, and the upper cover 1 and the lower cover 5 are 5 is fastened with a screw (not shown) to form an exterior part of the monocular.

At a substantially central portion of the upper cover 1, a rotatable distance knob 2 for moving the objective lens group 12 in the direction of the optical axis O is provided. The eyepiece frame 3 can be directly slid and driven to be pulled out. At the pulled-out position, the objective lens group 12 is moved forward and backward by rotating the distance knob 2 to focus on an arbitrary distance. Adjustment is possible. As shown in FIG. 1, a suspension ring 8 for attaching a strap is provided near the eyepiece side of the monocular.

Next, the internal structure of the optical system and the focus adjusting mechanism of the monocular having the above-described exterior structure according to the present embodiment will be described with reference to FIGS. FIG. 2 is a view of FIG. 1 as viewed from below, as viewed from the direction indicated by an arrow A, and is a view in which a part of the lower cover 5 is removed in cross section. 3 and 4 are sectional views taken along the line BB 'of FIG.
Shows a state in which both the eyepiece frame and the objective frame are retracted, and FIG. 4 shows a state in which the eyepiece frame is pulled out. FIG. 5 is a view showing a cross section taken along the line CC ′ of FIG. 3, and FIG. 6 is a perspective view of an objective holder to which an objective frame is fixed. 7 and 8 show:
FIG. 6 is a plan view when the distance knob is removed in a state where the objective frame is retracted or in a state where the objective frame is extended.

As shown in FIGS. 2 and 3, the monocular pair of objective lenses 12 of the objective optical system including objective lenses 12a and 12b are slidably sandwiched between the upper cover 1 and the lower cover 5, as shown in FIGS. Frame 7 for holding the eyepiece and eyepiece 10
An eyepiece group 10 of an eyepiece optical system composed of a, 10b, 10c, and 10d and an eyepiece frame 3 that holds a field stop 16 made of a plate member that determines a field of view are provided. Further, a prism optical system 1 composed of prisms 11a and 11b
1 is disposed at a fixed position with respect to the upper cover 1. Note that the objective frame 7 and the eyepiece frame 3 that hold the above-described optical systems are formed of, for example, a material such as metal or resin.

As shown in FIG. 5, the prism optical system 11 is always brought into contact with the upper cover 1 by a prism holder (A) 9 formed by a leaf spring disposed below the prisms 11a and 11b. The spring is biased upward. The prism holder (A) 9 is fixed to the lower cover 5 with screws 18.

Further, the prism optical system 11 has a structure shown in FIG.
As shown in FIG. 4, the spring is always urged by a prism holder (B) 13 formed of a leaf spring toward a prism contact plate 1b provided on the eyepiece lens side in the optical axis O direction. In this way, the prism optical system 11
By the biasing force of the prism holder (A) 9 and the prism holder (B) 13, which are two springs, the spring is always held at a fixed position regardless of the posture of the monocular.

The objective frame 7 in which the objective lens group 12 is incorporated
Is fixed to an objective holder 6 as a first drive mechanism that moves forward and backward along the optical axis O. The objective holder 6 has two guide holes 6 extending parallel to the optical axis O shown in FIGS.
b and 6c, and a driven pin 6a is provided between the guide holes as shown in FIG.

As shown in FIGS. 5 and 7, the guide holes 6b and 6c of the objective holder 6 are slidably fitted into two bosses 1d and 1e and one boss 1f projecting from the upper cover 1, respectively. . As shown in FIGS. 5 and 7, holder screws 15a, 15b, and 15c are fastened to the boss with the guide holes interposed between the main body and the washers 14a, 14b, and 14c. , 6c so that the bosses 1d, 1e, 1f do not come off.

On the other hand, as shown in FIGS. 3 and 4, a stepped screw 17 fitted into a shaft hole 1c provided in the main body 1 is fastened to the distance knob 2 as an adjusting member. It is rotatably supported with respect to it. Further, on the back side of the distance knob 2, a bottomed cam groove 2a which is a cam means having a shape as shown in FIG. 3, 4 or 7, 8 is provided. The driven pin 6a of the objective holder 6 is slidably fitted.

Therefore, when the distance knob 2 is rotated counterclockwise, the objective holder 6 is moved along the optical axis O by the driven pin 6a fitted in the cam groove 2a of the distance knob 2 as shown in FIG. From the position to the payout position shown in FIG. The objective lens group 12 held by the objective holder 6 via the objective frame 7 also advances and retreats, and focus adjustment is performed.

As described above, the objective holder 6 is guided by the guide elongated holes 6b and 6a fitted in the bosses 1d, 1e and 1f of the main body, and slides with respect to the upper cover 1 in a state parallel to the optical axis O. Since it is driven, the objective lens group 12 supported by the objective holder 6 via the objective frame 7 is also driven forward and backward in a state where eccentricity hardly occurs.

The eyepiece frame 3 is supported along the optical axis O in a state of being sandwiched between the upper cover 1 and the lower cover 5 as described above. The sliding range in the O direction, that is, the focus adjustment range is a range from the most depressed position on the infinity side (see FIG. 3) to the most extended position on the close side (see FIG. 4). The most extended position of the eyepiece frame 3 on the closest side is regulated by contact between the convex stopper 3c provided on the eyepiece 3 and the stopper 1a provided on the upper cover 1.

Further, as shown in FIGS. 4 and 5, a second drive is provided at the lower end of the eyepiece frame 3 and at the objective end of the leaf spring portion 3d elastically deformable in a direction perpendicular to the optical axis O. A protrusion 3a constituting a mechanism is provided, and the protrusion 3a is fitted into a concave / convex portion 5a provided on the lower cover 5 so that
A click feeling is obtained when the eyepiece frame 3 reaches the most depressed position on the infinity side (see FIG. 3) and the most extended position on the close side (see FIG. 4), and at the same time, the stop position of the eyepiece frame 3 Is restricted.

Although the focus adjustment position of the eyepiece frame 3 in the present embodiment is limited to two positions as described above,
By increasing the number of concaves and convexes of the concave / convex portions 5a provided on the lower cover 5, the focus adjustment position of the eyepiece frame 3 can be set to two or more places. Further, by eliminating the concave / convex portions 5a, the focus adjustment position of the eyepiece frame 3 can be stepless, that is, the movement adjustment to an arbitrary position is possible.

Also, in order to prevent eccentricity of the eyepiece group 10 that moves with the movement of the eyepiece frame 3, a clearance generated between the eyepiece frame 3 and the upper cover 1 and the lower cover 5 is provided.
That is, it is necessary to minimize the play. Therefore, in order to suppress the backlash, a plurality of linear projections 3b as a second drive mechanism extending along the optical axis O are provided on the outer peripheral portion of the eyepiece frame 3 as shown in FIGS. , Top cover 1
In addition, play is performed by contacting the sliding surface with the lower cover 5.

An eyepiece rubber 4 made of rubber is provided on an outer peripheral portion of the eyepiece frame 3 (see FIG. 2), and a part of the eyepiece frame 3 (see FIG. 2) is exposed from the eyepiece rubber 4. . The eyepiece rubber 4 can be partially folded outward.
Even people who use spectacles can observe without removing the spectacles.

Next, a description will be given of the operation of the focus adjustment by the monocular of the present embodiment configured as described above.
First, with the eyepiece frame 3 fully pushed in as shown in FIG. 3 and the eyepiece lens 10 moved to the infinity side, the distance knob 2 is rotated, so that the objective lens group via the objective holder 6 and the objective frame 7 is rotated. 12 can be moved back and forth to any position between the retracted position in FIG. 7 and the extended position in FIG. 8 to perform focusing from infinity to a predetermined intermediate position.

Further, by rotating the distance knob 2 while the eyepiece frame 3 is pulled out most as shown in FIG. 4 and the eyepiece lens 10 is moved to the closest side, the objective lens group 12 is similarly retracted as shown in FIG. It is possible to advance and retreat from the position to an arbitrary position between the extended positions in FIG. 8 to perform focusing from a predetermined intermediate position to a close position.

As described above, according to the monocular of the present embodiment, not only the objective lens group 12 but also the eyepiece lens group 10 are moved forward and backward by independent drive mechanisms to adjust the focus. The movement amount of the lens group can be made to compensate for the required extension amount. Therefore, the required movement amount of the eyepiece frame and the objective frame holding the lens group can be reduced, the total length of the main body when stored is shortened, and the size of the monocular itself can be reduced. Furthermore, the upper and lower covers, which are the exterior members, and the holding frames for the respective lens groups can be fitted with as little play as possible, so that the optical axis O is stable even when extended to the closest side.

In the case of the monocular of the above embodiment,
A description has been given of the forward / backward movement at the time of focus adjustment as the forward / backward movement of the lens group holding frame.

Next, a description will be given of a monocular according to a second embodiment of the present invention. The monocular of the present embodiment is different from the monocular of the first embodiment in the objective lens group 12
Are different from each other in the objective frame advance / retreat drive mechanism which is the first drive mechanism for holding Except for the objective frame and its driving mechanism, the structure is the same as that of the monocular of the first embodiment.

FIG. 9 is an exploded perspective view of a driving mechanism of the objective frame of the monocular according to the present embodiment. As shown in FIG. 9, the objective lens group 12 is incorporated in the objective frame 23. The objective frame 23 is provided with a female screw portion 23a screwed with the objective frame feed screw 21 and a notched guide groove 23b slidably fitted with the guide shaft 22. The feed screw 21 has an operation part 21a corresponding to a distance knob for rotating operation, and is rotatably supported by the monocular body. The guide shaft 22 is supported by the main body, and functions as a detent and a straight guide when the objective frame 23 moves forward and backward.

When the focus adjustment is performed by the monocular according to the present embodiment, similarly to the monocular according to the first embodiment, when the eyepiece frame is pushed in at the infinity side or pulled out at the closest side. Then, the operation unit 21a is manually rotated to move the objective lens group 12 forward and backward to perform focusing.

The monocular according to the present embodiment has the same effect as the monocular according to the first embodiment.
Since the advance / retreat drive 3 is performed by rotating the feed screw 21, the objective frame 23 can be easily moved to an arbitrary position, and the optical axis O can be moved smoothly and smoothly.

(Supplementary Note) According to the embodiment of the present invention described in detail above, the following configuration can be obtained. That is, (1) an objective optical system, an eyepiece optical system, a first drive mechanism that enables the objective optical system to move in the optical axis direction independently of the eyepiece optical system, and the objective optical system A monocular comprising: a second drive mechanism for independently moving the eyepiece optical system in the optical axis direction. According to the above-mentioned monocular, since the objective optical system and the eyepiece optical system are independently advanced and retracted, the amount of movement of the optical system can be reduced, and the main body in the housed state can be reduced in size.
The optical axis when extended to the close side is also stabilized.

(2) The monocular described in (1), wherein the first driving means has a feed screw mechanism for driving the objective optical system forward and backward. According to the monocular described above, the same effects as those of the supplementary note (1) can be obtained, and further, the objective optical system can be easily moved forward and backward, and the optical axis can be smoothly driven.

(3) an objective frame for holding an objective optical system;
An eyepiece frame for holding an eyepiece optical system, an eyepiece frame moving means for manually moving the eyepiece frame directly in the optical axis direction independently of the objective frame, and a plurality of predetermined positions for the eyepiece frame. A monocular comprising: holding means for holding the objective frame; and objective frame moving means for moving the objective frame in the optical axis direction with respect to the eyepiece frame held at the predetermined position. According to the monocular, since the objective frame and the eyepiece frame are independently advanced and retracted, the amount of movement can be reduced, and the size of the main body at the time of storage can be reduced. The axis stabilizes. Further, since the eyepiece frame is held at a plurality of predetermined positions, positioning of the eyepiece frame is facilitated.

(4) The objective frame moving means comprises an adjusting member rotatably provided and a cam means for driving the objective frame in conjunction with the adjusting member. (3) The monocular described in the above. According to the monocular described above, the same effects as those of the supplementary note (3) are obtained, and the structure of the objective frame driving means is simple and the occupied space is reduced.

(5) The monocular according to appendix (4), wherein said cam means comprises a cam pin provided on said objective frame and a cam groove provided on said adjusting member. According to the monocular described above, the same effects as those of the supplementary note (3) are obtained.

[0038]

As described above, the first aspect of the present invention is as described above.
According to the monocular described above, since the objective frame and the eyepiece frame are independently advanced and retracted, it is possible to reduce the amount of movement of the objective frame and the eyepiece frame, and it is possible to reduce the size of the monocular body during storage. At the same time, the optical axis when the objective frame or the eyepiece frame is extended is stabilized.

According to the monocular described in claim 2 of the present invention,
It has the same effect as the monocular described in claim 1, and furthermore, since at least one of the first and second driving mechanisms has a cam means, each frame is driven to an arbitrary position. Is possible, and the driving mechanism is simple and the occupied space is reduced.

According to the monocular described in claim 3 of the present invention,
The objective optical system and the eyepiece optical system are independently advanced and retracted, respectively, so as to compensate for the mutual movement amount in the optical adjustment, the movement amount of the optical system can be reduced,
At the same time, the size of the monocular body at the time of storage can be reduced, and at the same time, the optical axis when the objective optical system or the eyepiece optical system is extended is stabilized.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an appearance of a monocular according to an embodiment of the present invention.

FIG. 2 is a view of FIG. 1 viewed from a direction A, in which a lower cover of the monocular of FIG. 1 is removed, and a part is shown in a cross section.

FIG. 3 is a cross-sectional view taken along the line BB 'of FIG. 2, and shows a state in which the eyepiece frame is pushed in most.

4 is a cross-sectional view taken along the line BB 'of FIG. 2, showing a state in which the eyepiece frame is pulled out most.

FIG. 5 is a view showing a cross section taken along the line CC ′ of FIG. 3;

FIG. 6 is a perspective view of an objective holder to which an objective lens group and an objective frame holding the objective lens group in the monocular of FIG. 1 are fixed.

FIG. 7 is a plan view when the distance knob of the monocular in FIG. 1 is removed, and shows a state where focus is adjusted to a long distance side.

8 is a plan view of the monocular of FIG. 1 with a distance knob removed, showing a state where focus is adjusted to a short distance side.

FIG. 9 is an exploded perspective view of a mechanism for extending an objective lens group of monoculars showing a second embodiment of the present invention.

FIG. 10 is a longitudinal sectional view of a conventional monocular, and FIG.
10A shows a state where the focus is adjusted to an infinite distance, and FIG. 10B shows a state where the focus is adjusted to a close distance.

[Explanation of symbols]

 2 Distance knob (first driving mechanism) 3 Eyepiece frame 3a Projection (second driving mechanism) 3b Linear projection (second driving mechanism) 3c Leaf spring section (second driving mechanism) 5a... Concave and convex portions (second drive mechanism) 6... Objective holder (first drive mechanism) 7... Objective frame 10... Eyepiece lens group (eyepiece optical system) 12. Lens group (objective optical system)

Claims (3)

[Claims] 1. An objective frame for holding an objective optical system, an eyepiece frame for holding an eyepiece optical system, and a first drive mechanism for moving the objective frame in the optical axis direction independently of the eyepiece frame. And a second drive mechanism that enables the eyepiece frame to move in the optical axis direction independently of the objective frame. 2. The apparatus according to claim 1, wherein at least one of said first and second driving mechanisms has a cam means for driving an objective frame or an eyepiece frame by said cam means. The monocular according to 1. 3. An objective optical system, an eyepiece optical system, a first drive mechanism that enables the objective optical system to move in the optical axis direction independently of the eyepiece optical system, and the objective optical system A second drive mechanism for independently moving the eyepiece optical system in the optical axis direction, the objective optical system being moved by the first and second drive mechanisms, and an eyepiece The monocular, wherein movements of the optical system act so as to complement each other when performing optical adjustment.