JPH05323204A - Variable power binocular - Google Patents

Abstract

PURPOSE:To constitute the variable binocular which differs in aperture, power, etc., at low cost by using a power varying lens and an ocular, and the majority of a lens barrel which contains them in common and replacing only an objective part. CONSTITUTION:The prism chamber and objective lens barrel 13 of a telephoto optical system 10 are so constituted that they can be coupled and fixed by individual members, and plural kind of objective lens barrels 13 contain lens frames 14 incorporating objectives 11 differing in aperture or focal length can selectively be coupled with the prism chamber and supported turnably by corresponding coupling holding members; and the lens frames 14 are moved and then engaged with a slider for focus adjustment, and the objective lens barrel 13 and coupling holding members are replaced to constitute a binocular which is different in aperture and power.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to binoculars in which two telescopic optical systems are arranged in parallel with their optical axes being parallel to each other, and is a variable power lens provided in an optical path between an objective lens and an eyepiece lens. The present invention relates to variable power binoculars configured to change power by moving in the optical axis direction.

[0002]

2. Description of the Related Art In binoculars, two telescopic optical systems formed independently of each other are arranged side by side so that the distance between the eyepieces can be adjusted (interpupillary adjustment) according to each viewer. It is configured. Generally, two telescopic optical systems are swingably connected to each other on an axis parallel to the optical axis, and this telescopic optical system causes the two telescopic optical systems to come into contact with each other and change the distance between the optical axes of the eyepieces. Is becoming Also, using a Porro prism as an erecting prism, two telescopic optical systems in which the optical axis of the objective lens and the optical axis of the eyepiece lens are decentered are arranged side by side so as to be rotatable around the optical axis of the objective lens, There is also a structure in which the interpupillary distance can be adjusted by swinging the objective lens about the optical axis. There is a configuration in which a variable power lens that is movable in the optical axis direction is provided in the optical path between the objective lens and the eyepiece lens, and variable power is performed by moving the variable power lens. The variable power lens is configured such that at least two lens groups move relative to each other.

[0003]

Here, in the variable power binoculars as described above, the objective lens is replaced with one having a different diameter or focal length, and the variable power lens and the eyepiece lens are commonly used. It is conceivable to construct ones with different magnifications at low cost, but even if the objective lens is simply exchanged, the position of the eye point changes due to zooming due to the interlocking relationship of the relative movement of the two lens groups. In addition, the lens barrel itself must be changed, which increases the cost and diminishes the effect of sharing the eyepiece.

[0004]

SUMMARY OF THE INVENTION In view of the above-mentioned circumstances, the present invention has a variable power lens, an eyepiece lens, and most of a lens barrel for accommodating them, which are commonly used. An object is to provide variable power binoculars capable of constructing different ones at low cost.

[0005]

To achieve the above object, in the variable power binoculars according to the present invention, an objective lens barrel in which an objective lens is provided and an eyepiece side member in which an eyepiece is provided are provided. In addition to being formed by a separate member, the eyepiece lens side member changes the combined focal length with the eyepiece lens by movement in the optical axis direction, and the eyepiece side variable magnification lens, and the focal length of the objective lens by movement in the optical axis direction. The objective lens side of the objective lens to be changed has a plurality of types of objective lens barrels in which objective lenses having different apertures or different focal lengths are housed so as to move together Can be selectively coupled as a predetermined position between the two variable power lenses on the eyepiece side, and even if different objective lenses are used, zooming can be performed without changing the imaging position due to the co-action of the two variable power lenses. Gain, objective It is configured to be made with different port sizes to magnification by changing the lens barrel.

[0006]

Embodiments of the present invention will now be described with reference to the drawings. 1 is an external perspective view of an embodiment of the electric binoculars according to the present invention, FIG. 2 is a plan view, FIG. 3 is a side view, and FIG. 4 is a bottom view. In the illustrated binoculars, a Porro prism is used as an erecting prism, and the optical axis of the eyepiece 12 is decentered by a predetermined amount with respect to the optical axis OA of the objective lens (not shown in FIGS. 1 to 4). Book telephoto optical system 10 (10L, 10
R) is supported by the connecting and holding member 20, the main body member 30 connected to the rear surface of the connecting and holding member 20, and the holding plate 37 fixed to the rear surface of the main body member 30 in parallel for a predetermined distance. Is configured.

Below the main body member 30, there are a focus adjusting mechanism 50 (not shown in FIGS. 1 to 4) described later, a focus adjusting motor 70 which is a drive source thereof, and a drive source of the variable power interlocking mechanism 40. A zooming operation motor 80 is arranged, and a battery 33, which is a power source for driving the focus adjusting motors 70 and 80, has a rhombic cross section in parallel with the optical axis OA of the objective lens above the main body member 30. As shown in FIG. 11, four battery chambers 32 are formed, and the upper surface of the battery chambers 32 is covered with a cover 31. The cover 31 is pivotally supported by the connecting and holding member 20 by a shaft 34 at its front end, and its rear end side (eyepiece 12 side) swings upward to open and close the battery chamber 32, though not shown. .. Further, on the upper surface on the rear end side, operation switches 35 and 36 for focus adjustment and zooming (see FIG.
Are shown adjacent to each other).

The telescopic optical system 10 has a Porro prism 15P inside thereof, as shown in FIG. 5 which is a partial sectional side view and FIG. 6 which is a partial sectional plan view of one of them (the telescopic optical system 10L).
With the prism chamber 15 having a curved cross-section having the objective lens barrel 13 in the front and the eyepiece 1 in the rear.
2 are connected in an eccentric state, and the objective lens barrel 13 (13L, 13R) of the holding lens 21 (21L, 2L) is formed in the connecting and holding member 20 in parallel for a predetermined distance.
1R) are slidably fitted into the telescopic optical system 10 and the holding plate 37 fixed to the rear surface of the main body member 30 is attached to the telescopic optical system 10.
The substantially hemispherical projection 15A projecting at a position where the rear surface of the prism chamber 15 (the surface on the eyepiece 12 side) and the optical axis OA of the objective lens intersect is pressed so that it cannot be removed and rotation is allowed. The two telephoto optical systems 10L and 10R are held so that the optical axes OA and OA of the objective lenses are parallel to each other and are rotatable around the optical axes OA of the respective objective lenses.

The objective lens barrel 13 of the telephoto optical system 10 is
At the rear end of the cylindrical lens barrel portion 13A, the sectional view of the prism chamber 15 is the same as the sectional view of the prism chamber 15 shown in FIG. A connecting flange 13B as shown in FIG. 10 is integrally formed, and gear teeth having a predetermined thickness in the front-rear direction are formed on the outer edges of the connecting flange 13B on the side where the left and right telescopic optical systems 10L and 10R face each other. 1
5B is formed within a predetermined angle range centered on the lens barrel portion 13A. Further, a rib 13C having a predetermined height fitted to the inner circumference of the prism chamber 15 is provided on a surface of the connecting flange 13B facing the prism chamber 15, and a predetermined diameter is provided at a position corresponding to the center of the lens barrel portion 13A. A transparent hole 13D is formed. Screw through holes 13E ... Are provided at three equal intervals (angles) around the through hole 13D, and a female screw portion 13F is projectingly provided at a rib 13C portion on the outer surface side. Screws 101 through 13E are screwed into female screws 15C provided at corresponding positions on the prism chamber 15 side, and a female screw portion 13F penetrates the side plate from the outer side of the prism chamber 15 to form a flat screw 1.
02 is screwed and fixed by closing the opening on the front side of the prism chamber 15.

In the objective lens barrel 13, a lens frame 14 in which the objective lens 11 is housed is inserted so as to be slidably movable in the optical axis OA direction of the objective lens 11. The lens frame 14 shown in FIG. 5 has a cylindrical shape, and the rear surface of the objective lens 11 abuts on a stepped portion formed at a predetermined position on the inner circumference thereof, and the front surface of the objective lens 11 is screwed onto the inner circumference. It is configured by pressing and fixing with a ring nut 14A. Telephoto optical system 10 (10L, 10R) configured as described above
Are arranged side by side with the respective objective lens barrels 13L and 13R being slidably fitted into the holding holes 21 (21L and 21R) of the connecting flange 13B as described above. , 10R, the teeth 15B, 15B formed on the outer edges of the coupling flanges 13B, 13B mesh with each other, and the optical axis OA of the objective lens 11 of both telephoto optical systems 10L, 10R.
The rotation of the surroundings is interlocked, and by this interlocking rotation, both eyepieces 1
The interval between 2L and 12R is changed so that the interpupillary adjustment can be performed.

Here, in this embodiment, as shown in FIG. 7 which is a partial sectional side view and FIG. 8 which is a partial sectional plan view corresponding to FIGS. 5 and 6, respectively, an objective lens is provided in the prism chamber 15. An objective lens barrel 13 'containing an objective lens 11' different from the lens barrel 13 can be mounted. That is, the objective lens barrel 13 'shown in FIGS.
And an objective lens 11 'having a larger diameter and a longer focal length than that shown in FIG.
Connection flange 13 having the same shape as the above-mentioned objective lens barrel 13
A lens barrel portion 1 corresponding to the objective lens 11 'to be housed in B'
3A 'is integrally formed. A lens frame 1 in which an objective lens 11 'is incorporated and slidably fitted in a lens barrel portion 13A'
4'in this embodiment, the rear surface of the objective lens 11 'abuts on the front end of the lens frame 14' and the objective lens 1 '
The front surface of 1'is pressed and fixed by a ring nut 14A 'screwed onto the outer circumference. The aperture ratio of the objective lens 11 'is substantially equal to that of the objective lens 11, and the objective lens 11'
The higher the focal length, the higher the magnification.

The lens frame 14 'has a ring nut 14A'.
The part is slidably movable before and after a predetermined stroke in a state where the part projects forward from the front end of the lens barrel portion 13A 'of the objective lens barrel 13'. Further, the connection holding member 20 'to which the objective lens barrel 13' is rotatably fitted is also sized corresponding to the objective lens barrel 13 '.

As shown in an exploded perspective view in FIG. 13, the diopter is shown on the central bottom surface side of the connecting and holding members 20, 20 'sandwiched between the mounting positions (holding holes 21L, 21R) of the telephoto optical systems 10L, 10R. A focus adjustment mechanism 50 having a difference adjustment function is provided, and an operation arm 51A of a slider 51 of the focus adjustment mechanism 50 and a movable operation arm 55A mounted on the slider 51 so as to be movable relative to each other are connected and held by a connection holding member. Operation holes 20A, 20A formed in 20 and an objective lens barrel 13
Through holes 13A and 13A formed in L and 13R (A in FIG. 3)
11 is a sectional view taken along line A in FIG.
The lens frames 14L and 14R are fitted in the engagement grooves 14A and 14A of the L and 14R, respectively, and the lens frames 14L and 14R are moved in the front-rear direction by the movement of the focus adjusting mechanism 50 in the front-rear direction so that focus adjustment can be performed. There is. The connection holding members 20, 2
0'has the same structure as the focus adjusting mechanism 50, and will be described below in connection with the holding member 20.

In the focus adjusting mechanism 50, a slider 51 is arranged in a housing recess 22 formed in the connection holding member 20 so as to be movable by a predetermined amount in a direction parallel to the optical axis OA of the objective lens. As shown in FIG. 14 from the bottom side, the rear side of the slider 51 (on the eyepiece 12 side)
It is adapted to be moved and driven by a focus adjustment motor 70 arranged at. That is, on the rear side (on the eyepiece 12 side) of the slider 51, a drive arm portion 54 having a rack 54A formed on the side surface is extended, and the rack 54A of the drive arm portion 54 has two stages, large and small. A worm wheel 72B having gears 72A and 72B having a rotation shaft 72C as a vertical direction and a large diameter is fixed to a spindle of a focus adjustment motor 70 arranged on the inner surface of the lower cover 60 with the rotation shaft as the front-rear direction. Friction clutch gear 72 meshed with worm 71
The gear 51 meshes with the small diameter gear 72A, and the slider 51 is moved and driven in the direction parallel to the optical axis OA of the objective lens by the rotation of the focus adjustment motor 70 via the worm 71, the worm wheel 72B, and the gear 72A. Both lens frames 14L and 14R (that is, objective lenses 11 and 11)
Is also adapted to move within the objective lens barrels 13L and 13R for focus adjustment. The lower surface side of the focus adjusting mechanism 50 is covered with a lower cover 60 fixed to the lower surfaces of the connection holding member 20 and the main body member 30, and is held so as not to fall off.

The movable operation arm 55A of the slider 51 is
Although detailed description is omitted, the rack member 61 connected to the operation member 62 is moved and operated by operating the operation member 62 arranged on the back surface side of the lower cover 60 so as to be slidable in the left-right direction. As a result, the feed screw 56 is rotationally operated through the gear 57 that meshes with the rack 61A of the rack member 61, and the operation arm 51
It is configured to move relative to L in the front-back direction parallel to the optical axis OA of the objective lens, and thereby parallel to the optical axis OA of the objective lens of the lens frames 14L and 14R (that is, the objective lenses 11 and 11). The relative position of the direction is changed so that the diopter difference adjustment can be performed.

With the above-described structure, the lens frames 14 and 14 '(objective lenses 11 and 1) housed in the objective lens barrels 13 and 13' selectively mounted in the prism chamber 15 are provided.
1 ') is moved in the optical axis direction by the movement of the engaged focus adjusting mechanism 50, and focus adjustment is performed. The focus positions of the objective lenses 11 and 11' that are selectively mounted are the focus adjusting mechanism 50. The positions are set to be equal to the position of. That is, which objective lens 11, 11 '
Even in the case of using, if the focus adjustment mechanism 50 is in the same position, the focus position is also the same.
Further, the focal position is the objective-side variable magnification lens 17A described later.
And the eyepiece side variable power lens 17B.

The eyepiece section 12 is transformed into an eyepiece lens barrel 16 as shown in FIG. 15 which is an enlarged cross-sectional view of one side thereof, and as shown in FIG. 16 which is a side view of the telephoto optical system 10R corresponding to a view taken in the direction of arrow D. The doubling lens barrel 17 is rotatably fitted and the outer end thereof is pressed by an eyepiece frame 19 supporting an eyepiece 18 fixed to the outer end of the eyepiece lens barrel 16 and cannot be removed. It is installed. Variable magnification lens barrel 17
Has a cylindrical shape with a small diameter on the front end side (objective lens 11 side) and two different diameters, and a spur gear-shaped operation gear portion 17G is formed on the outer periphery of the front end of the large diameter portion.
Further, inside thereof, an objective-side variable magnification lens 17A having a negative power on the tip small diameter side and an eyepiece-side variable magnification lens 17B having a positive power on the rear end large diameter side respectively slide in the optical axis direction. It is movably inserted.

As described above, the objective-side variable power lens 17A has a negative power and acts so as to increase the focal length of the objective lens 11, and the eyepiece-side variable power lens 17B is separated from and brought into contact with the eyepiece lens 18. Acts so that the combined focal length of both changes. That is, the objective lens 11 or 1
1'and the objective-side variable magnification lens 17A constitute an objective-lens-side optical system, and the eyepiece-side variable magnification lens 17B and the eyepiece-lens 18 constitute an eyepiece-side optical system, and the objective-side variable-magnification lens 17A and the eyepiece-side variable magnification lens. It is set so that the zoom lens 17B moves together in a predetermined relationship to enable zooming without changing the image forming position. Here, in the present embodiment, the focal length of the objective lens 11 (composite focal length of the objective lens side optical system) is changed to 1 to 1.6 times by moving the objective variable magnification lens 17A in the optical axis direction. Further, it is set so that the combined focal length of the eyepiece lens side optical system is changed to 1 to 1.23 times by moving the eyepiece side magnification varying lens 17B in the optical axis direction, and the objective side magnification varying lens 17A and the eyepiece Side magnification lens 17
B is moved in the optical axis direction in a predetermined relative positional relationship so that the image-forming position does not move, so that a variable magnification of about 2 is continuously performed (that is, a variable magnification of about 2). As described above, the contribution ratio to the magnification change is larger in the objective-side variable-magnification lens 17A than in the eyepiece-side variable-magnification lens 17B, and one of them does not have a function of correcting the image-forming position. The variable power lens 17B and the objective-side variable power lens 17A move together to perform variable power, and the imaging position is set so as not to move.

Variable-magnification lens barrel 17 objective-side variable-magnification lens 1
7A and the position corresponding to the eyepiece side variable power lens 17B,
Two cam grooves 17C and 17D whose circumferential position and longitudinal position continuously change in a predetermined relationship are formed 180 ° apart in the circumferential direction. Cam grooves 17C, 17D
Is an objective-side variable power lens 17A and an eyepiece-side variable power lens 17B
Pins 17E and 17F respectively planted on the outer surface of the lens frame of
Is a width that is slidably fitted, and is formed so that the circumferential position and the longitudinal position are continuously changed in a predetermined relationship.

Pins 17 are provided on the outer surfaces of the lens frames of the objective-side variable power lens 17A and the eyepiece-side variable power lens 17B, respectively.
E and 17F penetrate the cam grooves 17C and 17D and project to the outside of the variable power lens barrel 17, and the projected pin 17
The tips of E and 17F are attached to the inner wall of the eyepiece lens barrel 16 and the inner wall of the holding barrel 12A into which the small diameter portion of the variable power lens barrel 17 extending to the prism chamber 15 side of the eyepiece lens barrel 16 can be fitted. The guide grooves 16A and 16B formed in the optical axis direction are slidably fitted respectively. That is, the pin 17E,
17F is a cam groove 17C, 17D and a guide groove 16A, 16D
When the variable-magnification lens barrel 17 is located at the intersection position of B, the cam grooves 17C, 1 with respect to the guide grooves 16A, 16B are rotated.
The intersection position of 7D is displaced in the optical axis direction, and the pins 17E, 17
F (that is, the objective-side variable power lens 17A and the eyepiece-side variable power lens 17B) is provided with the cam grooves 17C and 17D and the guide groove 16.
It is adapted to be moved and driven in the optical axis direction according to the displacement of the intersection position with A and 16B.

Specifically, as shown in FIG. 15, from the state where the objective-side variable power lens 17A and the eyepiece-side variable power lens 17B are closest to each other, the variable-power lens barrel 17 is clockwise when viewed from the eyepiece lens 18 side. When rotated, the objective-side variable magnification lens 17A moves closer to the objective lens 11 depending on the rotation angle,
The eyepiece side variable power lens 17B slides in the variable power lens barrel 17 in a predetermined relative positional relationship to the side close to the eyepiece lens 18 supported by the eyepiece lens frame 19, whereby the imaging position is changed. It is designed such that continuous zooming is performed without moving. Incidentally, the variable-power lens barrel of the other telephoto optical system (not shown) is also constructed in exactly the same way as the above-mentioned side.

Here, as shown in the optical path diagrams of FIGS. 17 to 18, the focal positions of the objective lenses 11 and 11 'are the same between the objective-side variable magnification lens 17A and the eyepiece-side variable magnification lens 17B as described above. The focal position is moved to the eyepiece side from the position in the absence of the objective variable magnification lens 17A by the action of the objective variable magnification lens 17A having negative power. The distance becomes longer). Objective lens 11 or 1 selectively used in the present embodiment
Since the aperture ratios of 1'are substantially equal to each other, their focal positions are substantially the same position. Therefore, even if the objective lenses 11 and 11 'are replaced, exactly the same objective-side variable magnification lens 17A and eyepiece-side variable magnification lens 17B. With the change of the relative position of, the zooming is possible without changing the image forming position.
Although not shown, a field ring (aperture stop) is fixedly arranged at the focal position of the above-mentioned objective lens side optical system, so that the boundary between the field of view and the field of view outside is clearly visible at any zoom position. It has become so. 17 and 18
Is drawn without the prism.

A holding plate 3 fixed to the rear surface of the main body member 30.
7 corresponding to the objective lens side from FIG. 7, which is a configuration diagram viewed from the plane side, and FIG. 2 corresponding to the EE sectional view of FIG.
21. As shown in FIG. 21, which is a partially cutaway sectional view corresponding to the FF section of FIG. 19, a variable magnification interlocking mechanism 40 for interlocking the variable magnification (variable lens barrel 17) of the left and right telephoto optical systems is provided. Has been. In the variable power interlocking mechanism 40, the connecting shaft 41 has the main body member 3
Left and right telephoto optics 1 rotatably supported at the rear end of 0
They are arranged on a line orthogonal to the optical axes OA of 0L and 10R, and the free refraction center positions of the connecting shafts 41 are respectively set to the centers of rotation of the telescopic optical systems 10L and 10R (of the objective lens 11). The end shafts 45, 45 are connected to each other via hook-shaped universal joints 42, 42 positioned on the extension line of the optical axis OA), and the left and right end shafts 45, 45 are respectively the variable magnification lens barrel 17 It is configured to be connected to the operation gear portion 17G of the above through a gear train 90.

The connecting shaft 41 is formed into two parts in the longitudinal direction, and the joint portion is cut out in a semi-circular shape with a predetermined length, and one notch portion has the other semi-circular end portion with a cross-sectional shape. A spur gear 41A is provided in the center of the longitudinal direction of the spur gear 41, which is complementarily fitted and screwed. As described above, the universal joints 42, 42 have their respective free refraction center positions (intersection points of the connecting shaft 41 and the end shaft 45) respectively set in the telescopic optical system 1.
Center of rotation of 0L and 10R (optical axis OA of objective lens 11)
Of the telescopic optical system 10L and 10R to the left and right with respect to the connection holding member 20.
Of the universal joint 42, 42
Is refracted (the angle of intersection between the connecting shaft 41 and the end shaft 45 changes), so that the rotational force can be transmitted. The rotation of the left and right telescopic optical systems 10L and 10R (swing of the eyepiece 12) is synchronized by the engagement of the teeth 15B formed at the front end of the prism chamber (outer edge of the coupling flange 13B) as described above. The left and right universal joints 42, 42 also have the same refraction angle (intersection angle between the connecting shaft 41 and the end shaft 45).

Below the connecting shaft 41, a spur gear 48 of small diameter is provided.
A friction clutch gear 48 in which B and a large-diameter worm wheel 48A are concentrically arranged has a gear shaft 48C connected to the connecting shaft 4
It is rotatably supported by the main body member 30 in parallel to the shaft 1, and its spur gear 48B meshes with the spur gear 41A fixed to the connecting shaft 41, and the worm wheel 48A is mounted on the spindle of the scaling operation motor 80 described later. It meshes with the fixed worm 81. The variable power operation motor 80 is adjacent to the focus adjustment focus adjustment motor 70 of the focus adjustment mechanism 50 in a state in which the spindle is projected toward the eyepiece 12 side with the rotation axis direction as the front-back direction on the inner surface of the lower cover 60. Are arranged side by side, and the worm 81 is fixed to the spindle.

The gear train 90 from the end shaft 45 through the universal joint 42 of the connecting shaft 41 to the operation gear portion 17G of the variable power lens barrel 17 is non-rotatable relative to the end shaft 45 and is slidable. The worm 91 is fitted to the
1 meshes with a worm wheel / helical gear 92 disposed above the worm wheel / helical gear 92,
As shown in the enlarged view of FIG. 13, a small diameter gear 93B which is a spur gear and a large diameter gear 93 which is a helical gear are provided at the end of the shaft portion 93A.
C is meshed with a large diameter gear 93C of a clutch gear 93, and a small diameter gear 93B of the clutch gear 93 is meshed with an idle gear 94 as a rotation operating member which is in mesh with the operating gear portion 17G. .. The above gear train 9
0 (that is, the worm 91, the worm wheel / helix gear 92, the clutch gear 93, and the idle gear 94) is installed inside the prism chamber 15 so as to be rotatable and immovable in the axial direction. There is something. The arrangement of the gears in the gear train 90 is such that the left and right telescopic optical systems 10L, 1L
Although symmetric at 0R, the worms 91 have the same screw direction of their teeth.

With the configuration of the variable power interlocking mechanism 40 as described above, the connecting shaft 41 is rotated by the rotational drive of the variable power operation motor 80, and the left and right telescopic optical systems are connected via the universal joints 42, 42. 10L and 10R gear trains 90 and 9
The rotational force is transmitted to 0, and the left and right telescopic optical systems 10L, 10
Since the teeth of the worm 91 of the R gear train 90 are screwed in the same direction, the left and right variable power lens barrels 17L and 17R are rotationally driven in the same direction, whereby the left and right telescopic optical systems 1
Continuous scaling of 0L and 10R is performed in synchronization.

When the interpupillary adjustment is performed by swinging the left and right telescopic optical systems 10L and 10R about the optical axis OA of the objective lens 11, the variable power interlocking mechanism 40 has its free refraction center position at the left and right telephoto positions. The universal joints 42, 42 located on the extension lines of the swing centers of the optical systems 10L, 10R (the optical axis OA of the objective lens 11) are refracted to maintain the interlocking state and allow this. Here, in the universal joint 42, the rotational angular velocity of the end shaft 45 side (worm 91) changes depending on the refraction angle even if the rotational angular velocity of the connecting shaft 41 is constant, but the left and right telescopic optical systems 10L and 10R are configured symmetrically. In addition, since the swing of both telescopic optical systems 10L and 10R is interlocked as described above and the swing angles are equal (the refraction angles of both universal joints 42 and 42 are equal), this rotational angular velocity is also equal to that of the left and right telescopic optical systems. The same as above, and the left and right telescopic optical systems 10L, 1L are always irrespective of the rocking positions (eye distance adjustment) of the telescopic optical systems 10L, 10R
The scaling of 0R is a perfect synchronization.

[0029]

As described above, according to the variable power binoculars according to the present invention, the objective lens barrel in which the objective lens is provided and the eyepiece side member in which the eyepiece is provided are separate members. And a variable magnification lens on the side of the eyepiece that changes the combined focal length with the eyepiece by moving in the direction of the optical axis, and a member that changes the focal length of the objective lens by moving in the direction of the optical axis. A plurality of types of objective lens barrels are housed so that the objective lens side variable magnification lens and the objective lens side move together, and the objective lenses having different apertures and / or focal lengths are installed inside It can be selectively coupled as a predetermined position between the two variable power lenses on the lens side, and even with different objective lenses, zooming can be performed without changing the imaging position due to the co-action of the two variable power lenses, Objective lens Since the configuration is such that different apertures and magnifications can be achieved by changing the barrel, by simply changing the objective lens barrel, most of the variable magnification lens, eyepiece lens, and barrel can be shared to reduce aperture and magnification. Different ones can be constructed at low cost.

[Brief description of drawings]

FIG. 1 is an external perspective view of an embodiment of variable power binoculars according to the present invention.

FIG. 2 is a plan view thereof.

FIG. 3 is a side view thereof.

FIG. 4 is a bottom view thereof.

FIG. 5 is a partial cross-sectional side view of one telescopic optical system.

FIG. 6 is a partial cross-sectional plan view thereof.

FIG. 7 is a partial cross-sectional side view of one telescopic optical system in which different objective lens barrels are mounted.

FIG. 8 is a partial cross-sectional plan view thereof.

9 is a view corresponding to a line GG in FIG.

10 is an equivalent view taken along the line HH of FIG.

11 is a cross-sectional view taken along the line AA of FIG.

12 is a sectional view taken along line CC of FIG.

FIG. 13 is an exploded perspective view of a focus adjustment mechanism portion.

FIG. 14 is an explanatory diagram showing a configuration of a focus adjustment mechanism portion viewed from the back side.

FIG. 15 is a cross-sectional view of the eyepiece on one side.

16 is a side view of the telephoto optical system corresponding to the view on arrow D in FIG.

FIG. 17 is an optical path diagram in the case of an objective lens having a short focal length.

FIG. 18 is an optical path diagram in the case of an objective lens having a long focal length.

FIG. 19 is a configuration diagram of a variable power interlocking mechanism when viewed from the plane side.

FIG. 20 is a view corresponding to the EE cross-sectional view of FIGS. 2 and 19;

FIG. 21 is a partially cutaway cross-sectional view corresponding to the FF cross section of FIG. 19;

[Explanation of symbols]

 10 ... Telescopic optical system 11, 11 '... Objective lens 12 ... Eyepiece part 13, 13' ... Objective lens barrel 14, 14 '... Lens frame 15 ... Prism chamber (eyepiece side member) 15P ... Porro prism 17A ... Objective Side magnification varying lens 17B ... Eyepiece side magnification varying lens 20 ... Connection holding member 51 ... Slider (focus adjusting member) OA ... Optical axis of objective lens

Claims (2)

[Claims] 1. Binoculars in which two telescopic optical systems are arranged side by side so that their optical axes are parallel to each other and can be brought into contact with and separated from each other, and an objective lens barrel having an objective lens and an eyepiece lens are internally provided. The eyepiece lens side member is formed by a separate member, and the eyepiece lens side member, the eyepiece lens side variable power lens for changing the combined focal length with the eyepiece lens by moving in the optical axis direction, and the optical axis. A plurality of types of objective lens barrels are housed so that the objective lens-side variable power lens that changes the focal length of the objective lens by moving in the same direction, and the objective lenses having different apertures or different focal lengths are internally provided. The focus position of the objective lens can be selectively coupled as a predetermined position between the two variable power lenses on the objective lens side and the eyepiece lens side, and even if the different objective lenses are used, Working together Therefore, the variable power binoculars are configured so that the magnification can be changed without changing the image forming position, and the objective lens barrel can be changed to have different apertures or magnifications. 2. The telescopic optical system uses a Porro prism as an erecting prism, the optical axis of the objective lens and the optical axis of the eyepiece lens are decentered, and the Porro prism is formed on the eyepiece lens side member. And a lens frame in which the objective lens is provided inside the prism chamber, the objective lens barrel being movably accommodated in the optical axis direction of the objective lens is fixed. Alternatively, a plurality of types of objective lens barrels accommodating lens frames having objective lenses having different focal lengths may be selectively coupled to the prism chamber, and the telescopic optical system corresponds to the objective lens barrels. While being rotatably supported by the connecting and holding member, the accommodated lens frame engages with a focus adjusting member provided in the binoculars body so as to be movable in the optical axis direction of the objective lens, Magnification binoculars according to claim 1, wherein it is movement operation in the optical axis direction of the objective lens focus adjustment is configured attempted, characterized by the movement operation of the adjustment member.