JP3048308U - Extension mechanism of optical system for compact binoculars - Google Patents

Abstract

(57) [Summary] [Purpose] In order to be portable, the width of the left and right optical systems is reduced and the length in the front-rear direction is reduced to a reduced state. In addition to widening the left and right optical systems to the position where the left and right optical systems are located, the relative arrangement of each objective lens and each eyepiece of the left and right optical systems is quickly drawn to the focus area. A helical groove is provided on a rotating shaft having a rotating wheel for focusing, which has a steep slope at a starting point side of an extending operation of each optical system by rotation of the rotating wheel and a gentle slope at an end side of the extending operation. The sphere intervening in this groove is housed and held in the optical system driving body, and the optical system driving body is thrust in the front-rear direction in response to the rotation of the rotating shaft due to the rotation of the rolling wheel, and the optical system driving body is The light is transmitted to the lens frame of the optical system to increase the feeding speed at the beginning of the feeding, and to reduce the feeding speed in the in-focus region of the end region of the feeding, which is useful for fine adjustment in focusing.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 As a compact type of binoculars, the size is reduced to the size of a memo pad that can be stored in a pocket when carrying it, and the space between the left and right optical systems is expanded to be equal to the interocular distance when used. About binoculars.

[0002]

[Prior art]

 These types of compact binoculars are called card-type binoculars or memo-type binoculars, and they are very convenient to carry and are not bulky, but in many cases the right and left optical systems are smaller than the interocular distance. When used by taking it out of a pocket, etc., the left and right optical systems are pulled out to the side of the axis centering on the axis that supports the focusing wheel, which is located in the center, and The system was configured to make the distance between the optical axes of the system equal to the interocular distance.

The mechanism for expanding the distance between the left and right optical systems and aligning it with the interocular distance is simple in terms of structure because the mechanism for sliding each of them outward with respect to the base constituting the binoculars is simple. Yes, it is often used because it is easy and quick to operate.

[0004] However, reducing the size by merely increasing or decreasing the space occupied by the left and right optical systems on both sides of the rotating shaft of the wheel for focusing can reduce the lateral width of the binoculars when carried. However, it was still not enough to achieve the results of miniaturization.

[0005]

[Problems to be solved by the invention]

 When used, the width of the binoculars should be expanded to match the interocular distance, and when carried, the left and right optical systems should be moved closer to each other toward the rotation axis of the wheel to reduce the width. The distance between the objective lens and the eyepiece can be increased or decreased in the front-back direction of the optical axes of the left and right optical systems, while maintaining the required function of the slide mechanism. In that case, the overall size when carrying is further reduced, the portability is further improved, the carrying becomes convenient, and more compact binoculars are obtained, which is beneficial.

A first object of the present invention is to provide binoculars capable of contracting and expanding the width including right and left optical systems, in a direction orthogonal to the binoculars while maintaining the functional configuration required for the binoculars. In other words, the length of the front and rear along the optical axis direction of each optical system is also extended and contracted, and when used, the length in the front and rear direction is extended to bring the objective lens and the eyepiece into a focusing area (infinity). The area from the focus matching point for the point to the focus matching point for the shortest visible distance is referred to as a focus area in this specification), and when it is carried around, the direction in which the relative distance between the objective lens and the eyepiece is reduced Then, one or both of them are moved to reduce the size occupied by the binoculars in the front-rear direction, thereby providing smaller binoculars.

A second object of the present invention is to extend the length in the front-rear direction occupied by each of the left and right optical systems from a reduced state advantageous for carrying to a focusing area to a required distance between respective lenses. One of the objective lenses and the eyepiece lens is to be performed by rotating the rotating wheel for fine adjustment for focusing in the focusing area to simplify the mechanism.

A third object of the present invention is to move one or both of the left and right optical systems in order to change the relative position of the objective lens and the eyepiece from the reduced position of the left and right optical systems toward the focusing area. Without giving a movement proportional to the amount of rotation by the rotating operation of the rotating wheel to the objective lens and / or the eyepiece, fine adjustment for precise focus alignment is possible in the focusing area. The amount of movement of the objective lens and / or the eyepiece lens or both of them on the optical axis is reduced with respect to the amount of rotation of the wheel, and conversely, the movement of one or both lenses in a region out of the focusing area The aim is to move the wheel quickly at the same rotation angle of the wheel to move quickly from the contracted state when carrying the camera to the in-focus area, thereby improving usability.

The other objects can be understood from the description of the embodiment of the present invention specifically disclosed to satisfy the problem to be solved.

[0010]

[Means for Solving the Problems]

 In order to solve the above-mentioned problem, in the present invention, a steep slope is provided on a rotating shaft having a focusing wheel, and a steep inclination is provided at a starting point side of an extending operation of the optical system by rotation of the rotating wheel, and an end side of the extending operation is provided. A spiral groove which is gently inclined is provided, and an optical system driving body having a sphere intervening in the groove therein and penetrating the rotary shaft provided with the spiral groove is moved along the axis of the rotary shaft. And holding the lens frames of the left and right optical systems via a relay connecting member that guides the movement of the left and right optical systems that can move away from and approach each other toward the side of the rotating shaft. The optical system driver was cooperated.

[0011] More specifically, a rotating shaft provided with a focusing wheel, a spiral groove provided on the rotating shaft, a sphere interposed in the spiral groove, and the sphere held therein. The optical system driver having the spiral shaft provided with the rotating shaft penetrates the left and right optical systems in the left and right directions perpendicular to the axial direction of the rotating shaft, and is simultaneously separated from or approached to each other. Next, a relay connecting member protruding from a part of each of the lens frames of the left and right optical systems toward the other optical system, holding these relay connecting members, and connecting the respective relay connecting members to each other. Each part is constituted by an immovable casing that occupies between the left and right optical systems while supporting the movement of separating or approaching in the opposite direction, and forming the spiral groove with the extension starting point of the left and right optical systems. Side has a large pitch with a steep slope, and a gentle slope at the end of the payout The relay system is formed by changing the pitch sequentially so as to have a slanting small pitch, and the relay connecting member is linked to the optical system driving body, and the optical system is moved in the immovable housing with the rotation of the rotating shaft. In moving the left and right optical systems in the direction of their optical axes in accordance with the operation of pushing the driving body in the direction of the axis of the rotary shaft, the moving operation is rapidly performed in the initial stage of feeding. This is done and the moving speed is gradually reduced so that the moving operation becomes slower in the focusing area near the end of the feeding.

[0012]

[Embodiment]

 According to the present invention, when moving the objective lens or the eyepiece in the left and right optical systems in the direction of their optical axes, either one of them may be moved relative to the other, or both may be simultaneously moved. . In any case, a spiral groove is provided on the rotation axis of the focusing wheel, and a sphere intervening in the spiral groove is housed in an optical system driving body connected to the optical axis moving member of the movable optical system. The sphere intervenes in the spiral groove at the position where the objective lens and the eyepiece are relatively closest to each other, that is, in the contracted state at the time of carrying the binoculars in which the length along the optical axis direction of the optical system is the shortest. On the side of the initial extension position during the stretching, a large pitch is taken so as to have a steep angle on the inclined rotation axis of this spiral groove, and conversely, as the rotation axis approaches the extension end position, The pitch of the formed spiral groove is made gentle to reduce the pitch, and the movement of the optical system driving body containing the sphere along the optical axis direction is changed. Movement along the axial direction of the optical system driver connected to the direction moving member And in response to rotation of the same rolling wheel, so as to vary gradually slow movement from the rapid movement.

As another means, the inclination of the helical shaft on the rotation axis is set to a steep inclination near the extension end position, and the inclination is set to a uniform gentle inclination immediately before the position where the focusing area is reached. Then, fine adjustment may be made so that the focus adjustment operation after reaching the focus area can be performed precisely.

When the objective lenses in the left and right optical systems are moved with respect to the eyepiece, and only the objective lens is moved on the optical axis of the optical system to extend the size of the binoculars in the front-back direction, the sphere is moved. An optical system driving body that is housed and slidable in the front-back direction may be linked with the moving member in the optical axis direction of the objective lens.

Conversely, when the eyepiece is moved with respect to the objective lens and only the eyepiece is moved on the optical axis of the optical system to extend the size of the binoculars in the front-back direction, The optical system driving body that accommodates the sphere and is slidable in the front-rear direction is linked to the optical axis direction moving member of the eyepiece.

In order to change the relative distance between the objective lens and the eyepiece by moving both the objective lens and the eyepiece, the spiral groove on the rotating shaft provided with the rolling wheel is connected to the objective lens. It is necessary to separately form a spiral groove corresponding to the eyepiece and a spiral groove corresponding to the eyepiece, and make them have a pitch opposite to each other. The movement of the optical system driver driven by the rotation of the spiral groove and the movement of the optical system driver that holds the eyepiece are connected to the optical system moving member that holds the eyepiece. It is necessary to move the optical system driving bodies apart from each other or close to each other during the rotation-driven movement of the optical system driving bodies.

However, the compact binoculars of this kind are extremely small in size, so that even when the left and right optical systems are extended and used, the binoculars can be brought close to the eyepiece and viewed. When performing telephoto observation at a distance, the nose bridge between the binoculars is often in contact with the rear part of the center of the binoculars behind the wheel during peeping, making it difficult to bring the binoculars sufficiently close to the end surface of the eyepiece. For this reason, it is preferable that the eyepiece system be largely protruded from the outer part of the binoculars. That is, if the eyepiece lens system is largely moved to the rear end without moving the objective lens system, or if the movement of the objective lens system in the direction of extension is reduced and the movement of the eyepiece system in the direction of extension is increased, the binoculars The bridge of the nose can be fully accommodated between the left and right eyepieces that protrude greatly from the rear surface, and do not interfere with the operation of distant observation.

[Embodiment] As a desirable example in the above-described devised embodiment, the case shown in the drawings will be specifically described below.

In each of the drawings, the portions with a two-digit number sign indicate general components as binoculars and each portion directly related to the present invention, and the portions with a three-digit number sign indicate It is needed in connection with a mechanism that slides to the left and right of the rotating shaft of the rolling wheel to make the left and right optical systems consistent with the interocular distance from the state of being contracted to be carried around. It shows a part.

As the essence of the binoculars, the right and left optical systems and the structure of each part storing the same are naturally symmetrical about the rotation axis XX of the wheel W. Therefore, in this specification, the left optical system and its related parts will be mainly described, and the description of the right optical system and its related parts will be omitted, but the right optical system and its related parts will be omitted. It should be understood that the parts related to the above have the same configuration and operation as the structure of the left optical system and the related parts.

That is, the movement of the left optical system is simultaneously moved in the same direction and at the same time as the movement of the right optical system.

The mechanism for changing the lateral width of the binoculars apart from each other and approaching each other with the rotation axis XX as a boundary is as follows.

The objective lenses 11 and the eyepieces 12 and the objective lenses 13 and the eyepieces 14 constituting the left and right optical systems L and R are arranged in mirror frames 15 and 16 for holding them, respectively. The lens frame 15 is provided with an overhang 17 on its inside, and the lens frame 16 is provided with two overhangs 18 and 20.

The projecting portion 17 has a relay connecting rod protruding horizontally inward from a part thereof, and extends from the projecting portion 17 of the lens frame 15 of the left objective lens 11 to the rotation axis. A relay connecting rod protruding in a direction orthogonal to XX is denoted by reference numeral 101, and is opposite to the relay connecting rod 101 from the projecting portion 17 of the lens frame 15 of the objective lens 13 of the right optical system R. A relay connecting rod protruding in a direction orthogonal to the rotation axis XX is indicated by reference numeral 103. As shown in FIG. 4, these relay connecting rods 101 and 103 are arranged so as to have a vertical difference, and the left relay connecting rod 101 is higher than the right relay connecting rod 103.

On the other hand, the projecting portion 18 has flat relay connecting bridge pieces protruding horizontally inward from each other in a direction perpendicular to the rotation axis XX from the front end lower surface thereof. The reference numeral 102 indicates a relay connecting bridge protruding from the overhang portion 18 of the lens frame 16 of the left eyepiece 12, and the relay connecting bridge protruding from the lens frame 16 of the right eyepiece 12. This is indicated by reference numeral 104.

These relay connecting bridges 102 and 104 are also arranged so as to have a vertical difference as shown in FIG. 5, and the left relay connecting bridge 102 is connected to the right relay connecting bridge. It is higher than 104.

As shown in FIG. 3, the above-mentioned relay connecting rods 101 and 103 penetrate into horizontal long grooves 35 formed in the side walls of the casing 25 fixed to the binocular base in a stationary state. Further, the relay connection bridge pieces 102 and 104 also penetrate into the horizontal long grooves 36 formed in the rear of the respective side walls of the casing 25, and the respective relay connection pieces 101 and 103 are clearly shown in FIG. In this manner, the relay connecting bridge pieces 102 and 104 occupy the vertically overlapping positions as apparent from FIG.

When the left and right optical systems L and R are moved laterally away from the rotation axis XX, the relay connecting rods protruding from the projecting portions 17 and 18 of the lens frames 15 and 16. 101 and 103 and the relay connecting bridge pieces 102 and 104 also move in the lateral direction together with the overhang portions 17 and 18, respectively, and the amount of these movements depends on the distance between the optical axes of the left and right optical systems L and R. The position corresponding to the distance is set as a limit, and is limited by a mechanism (not shown) associated with each of the relay connecting rods 101 and 103 and the relay connecting bridge pieces 102 and 104 so as not to move any more. . Further, the movement of moving the left and right optical systems L and R laterally in a direction away from the housing 25 including the rotation axis X-X with respect to each other is performed so as to move in a correlated manner. Although an interlocking mechanism is set up between them, they are not shown because they are not directly the subject of the present invention.

In addition, between the front surface and the rear surface of the container frame 19 holding the lens frames 15 and 16 incorporating the left and right optical systems L and R, the projection of the lens frame 15 of the above-mentioned objective lens system is provided. A guide rod 21 penetrating the portion 17 and the projections 18 and 20 of the lens frame 16 of the eyepiece lens system is provided, and the lens frame 15 and the projection 17 thereof, and the lens frame 16 and the projection in front thereof are provided. The rear projection 18 and the rear extension 20 can be slid in the front-rear direction along the guide rod 21.

As a result, when the left and right optical systems L and R are laterally moved in opposite directions in a direction away from the housing 25, respectively, the mirror frames 15 and 16 on the housing 19 and the projecting portions 17 and The guide rods 18 and 20 and the guide rods 21 penetrating these overhangs respectively move in the left and right direction while being the same body, and at this time, the relay connecting rods 101 and 103 and the relay connecting bridge pieces 102 and 104 It slides inside the casing 25 and moves laterally together with the overhang portions 17 and 18.

Conversely, when the binoculars are to be reduced in width and used for carrying, the guide rods 21 and 16 mounted on the mirror frames 15 and 16 holding the left and right optical systems L and R and the frame 19 are provided. When the overhanging portions 17, 18, and 20 fitted thereto are moved as close as possible to the casing 25, the relay connecting rods 101 and 103 and the relay connecting bridge pieces 102 and 104 become It penetrates deeply into the casing 25 and returns to its original state.

The operation of expanding or contracting the left and right widths of the binoculars is realized by the above-described structure and the operation based on the above structure, and the distance between the left and right optical systems L and R of the binoculars is set at a position corresponding to the interocular distance. In a state where the objective lens system and the eyepiece lens system are moved sideways and expanded to the front and rear direction of the optical axis, and brought to the focus area, the function and the function thereof are as follows. One of the features of the present invention is that it is performed while maintaining the structure and function of the present invention, and these will be clarified by the following description.

The casing 25 is provided with a rotating shaft 24 of the wheel W in the center front-rear direction via a suitable bearing. The rotating shaft 24 extends from the front to the rear of the binoculars. The threaded portion 23 is formed with a constant pitch, the spiral groove 32 is formed with a steep slope toward the front and gradually inclined toward the back, and a rolling wheel W.

An objective lens in which a relay connecting rod 101 and 103 are fitted in a spiral portion 23 formed at a constant pitch, and a spiral 29 screwed with the spiral portion 23 is formed above the relay connecting rod 101 and 103. The driving body 27 is incorporated in the housing 25, whereby the rotation of the rotating shaft 24 that is rotated by rotating the rolling wheel W changes the objective lens driving body 27 to the axis XX of the rotating shaft 24. Thrust in the direction. As a result, no matter what lateral movement position the left and right optical systems occupy with respect to the housing 25, the lens frame 15 holding the objective lens 11 can be extended through the relay connecting rods 101 and 103. It moves back and forth in the optical axis direction together with 101. The long grooves 35 formed in each side wall of the casing 25 allow the relay connecting rods 101 and 103 to move in the front and rear directions in the grooves during the front and rear movement. The relay connecting rods 101 and 101 extend from the position where the objective lens system is most retracted, that is, the position where the size of the binoculars in the front-rear direction is smallest, to the position where the objective lens system reaches the most advanced position in the focusing area. It has a length corresponding to the operation amount before and after 103. (FIG. 3 shows the position of the relay connecting rod 101 when the objective lens 11 occupies a position corresponding to the endmost visible distance in the focusing area.) On the other hand, the forward and backward movements of the objective lens system are shown. Separately, a shaft cylinder portion 34 having a spiral groove 32 having a special spiral shape in which the front portion is steeply inclined and gradually inclined gradually toward the rear side is a state in which the spherical body 30 is fitted into the spiral groove 32. To penetrate the eyepiece driver 28. FIG. 5 shows the relative structure of the eyepiece driver 28 and the sphere 30 intervening in the shaft cylinder portion 34 and the spiral groove 32. In FIG. 5, reference numeral 38 denotes a sphere holding member having a U-shaped cross section which is attached so as to embrace the eyepiece driving body 28 from underneath the eyepiece driving body 28. A holding piece 40 for holding the bridge pieces 102 and 104 is provided.

The objective lens driver 28 including the sphere 30 held by the sphere holding member 38 is also housed in the casing 25 as is clear from FIGS. 1 and 2, and the relay connection bridge pieces 102 and 104. Is connected to the front projecting portion 18 projecting from the lens frame 16 including the eyepiece lens 12 via the lens, so that when the rotating wheel W is rotated to rotate the rotating shaft 24 (along with the shaft cylinder 34), the sphere 30 Inside the eyepiece driving body 28, it rolls in the spiral groove 32, and thereby urges the eyepiece driving body 28 in the front-rear direction. This movement is caused by the relay connection bridges 102, 104 and the overhang. The lens frame 16 of the eyepiece system is moved back and forth through the unit 18.

In this embodiment, the forward and backward movement of the objective lens system by turning the rolling wheel W is such that the spiral portion 23 and the spiral 29 screwed with the spiral portion 23 are formed as spirals having a constant pitch. Therefore, there is a proportional relationship between the amount of rotation of the rotary shaft 24 that rotates the wheel W and the amount of forward / backward movement of the objective lens system. As a feature of the present invention, the amount of forward / backward movement of the eyepiece lens system is 24 is not proportional to the amount of rotation.

That is, in the present invention, the spiral groove 32 is made steeper at the portion closer to the front end of the shaft cylinder 34, and the pitch is made larger, and the rear end of the shaft cylinder 34 (the side closer to the rolling wheel W) becomes gentler. When the wheel W is rotated from the state in which the left and right optical systems are retracted into the casing 19, as in the case of carrying in FIG. The amount of extension and projection of the optical system increases for the same amount of rotation, and a rapid extension and extension action is performed.

Further, as the rotating wheel W continues to rotate, the objective lens system moves forward, and at the same time, the eyepiece lens system retracts, and as they approach the in-focus area, the rotation amount or speed of the same rotating wheel increases. Therefore, the retreat amount or speed of the eyepiece optical system decreases rapidly.

Therefore, after reaching the focusing area, the retreat amount of the eyepiece optical system is reduced and the retreat speed becomes slow even for a large rotation angle of the rotating wheel W, and the rotating wheel in the focused area is reduced. Fine adjustment of the position of the eyepiece is performed with respect to the rotation amount of W.

In addition, reference numeral 42 in the drawing denotes a mounting screw for the guide rod 21 that penetrates a part of the casing 19 and is screwed into the guide rod 21 when the guide rod 21 is mounted on the casing 19. .

Reference numeral 43 denotes a recess that prevents the bridge of the nose from hitting behind the binoculars when looking into the eyepieces 12 and 14.

[0042]

[Effect of the invention]

 In the optical system feeding mechanism of the present invention, when the left and right optical systems are housed in the container frame and the length of the optical system in the front-rear direction is extended by driving these optical systems, the left and right optical systems are in the minimum volume. In the early stages of rotation, when the wheel is rotated, the projection amount of the optical system (eyepiece system in the case of the embodiment) is large in relation to the rotation of the wheel, and it can be quickly brought to the focusing area. In the focusing area, the amount of forward / backward movement of the optical system can be finely adjusted. is there. Nevertheless, for the optical system in the focusing area, the amount of forward and backward movement along the optical axis of the optical system is slow for a large rotation of the rolling wheel, and the precision according to the distance of the observation target is assumed. It is possible to achieve the effect that the focus adjustment can be performed.

Further, in order to exhibit the above-mentioned excellent functions, in order to make the left and right optical systems coincide with the interocular distance, a mechanism for expanding the left and right optical systems in opposite directions to each other is provided. On the other hand, since it is possible to provide the function of extending and retracting the optical system without requiring any special structural modification, the entire system can be provided at low cost with a small number of parts and the number of assembling steps, and there are few failures. There is a great deal of contribution to improving the functions of compact binoculars.

[Brief description of the drawings]

FIG. 1 is a plan view showing a part of a pair of binoculars having an optical system extending mechanism according to the present invention.

FIG. 2 is an essential part of the binoculars shown in FIG. 1 in a state in which the left and right optical systems are moved to expand to a position corresponding to an interocular distance, and the objective lens system and the eyepiece lens system are moved to a focusing area. FIG.

FIG. 3 is a left side view of a housing in which a main part of the optical system feeding mechanism of the present invention is installed.

FIG. 4 is a front view showing the position occupied by the objective lens driving body and the positions occupied by the left and right objective lens systems and their relay connecting rods in the optical system feeding mechanism according to the present invention;

FIG. 5 is a rear view showing the position occupied by the eyepiece driver and the positions occupied by the left and right eyepiece systems and their relay connection bridges in the optical system feeding mechanism according to the present invention;

[Explanation of symbols]

 L Left optical system R Right optical system W Wheel XX Rotation axis 11 Objective lens 12 Eyepiece 13 Objective lens 14 Eyepiece 15 Objective lens frame 16 Eyepiece lens frame 17 Objective lens system Projection part of lens frame 18 Front projection part of lens frame of eyepiece system 19 Container frame 20 Projection part of rear part of lens frame of eyepiece system 21 Guide rod 22 Inverting reflection optical system 23 Spiral part 24 Rotation axis of wheel 25 Case 27 Objective Lens Driver 28 Eyepiece Driver 29 Spiral 30 Sphere 31 Constant Pitch Thread 32 Spiral Groove 34 Shaft with Spiral Groove 35 Long Groove 36 Long Groove 38 Sphere Holding Member 40 Holding Piece 42 Mounting Screw 43 Concave 101 Relay Connecting rod 102 Relay connecting bridge 103 Relay connecting rod 104 Relay connecting bridge

Claims (9)

[Utility model registration claims] 1. A rotary shaft having a focusing wheel,
A spiral groove having a steep slope at the starting point side of the extending operation of the optical system due to the rotation of the rotating wheel and a gentle inclination at the end side of the extending operation was provided, a sphere intervening in this groove was provided, and the spiral groove was provided. The left and right optics, which hold the optical system driving body through which the rotating shaft has penetrated so as to be movable along the axis of the rotating shaft, and which can be separated and approached toward the side of the rotating shaft. An optical system extension mechanism in compact binoculars, wherein each lens frame of the left and right optical systems is linked to the optical system driver via a relay connecting member for guiding the movement of the system. 2. On a rotating shaft having a focusing wheel.
The eyepiece lens system is provided with a spiral groove which is steeply inclined at the starting point side of the extending action of the eyepiece lens by rotation of the rotating wheel and has a gentle inclination at the end side of the extending action, and a spherical body intervening in this groove is provided, and the spiral groove is provided. Eyepiece driving body through which the rotation axis has penetrated,
While holding movably along the axis of the rotating shaft, toward the side of the rotating shaft, via a relay connecting member that guides the movement of the left and right optical systems that can be separated from each other and approached, An extension mechanism of an optical system in compact binoculars, wherein each eyepiece lens frame of the left and right optical systems is linked with the eyepiece driver. 3. On a rotating shaft having a focusing wheel.
A spiral groove which is steeply inclined at the starting point side of the extending operation of the objective lens system due to rotation of the rolling wheel and is provided with a gentle inclination at the end side of the extending operation is provided, and a sphere intervening in this groove is provided therein, and the spiral groove is provided. The objective lens driver having the rotating shaft penetrated therethrough,
While holding movably along the axis of the rotating shaft, toward the side of the rotating shaft, via a relay connecting member that guides the movement of the left and right optical systems that can be separated from each other and approached, An extension mechanism of an optical system in compact binoculars, wherein each objective lens frame of the left and right optical systems is linked with the objective lens driver. 4. A spiral having a steep slope in front of a rotating shaft having a focusing wheel and a steep slope at a starting point side of an extending operation of the objective lens system by rotation of the rotating wheel, and a gentle slope at an end side of the extending operation. A groove is provided, and an objective lens driving body having a sphere intervening in the groove therein and having a helical groove penetrating the rotation axis is held movably along the axis of the rotation axis, and the rotation is performed. Toward the side of the axis, separate from each other, via a relay connecting member that guides the movement of the left and right optical systems that enable approach, each objective lens frame of the left and right optical systems and the objective lens driver The spiral having a steep inclination at the starting point side of the extending operation of the eyepiece system by the rotation of the rotating wheels, and having a gentle inclination at the end side of the extending operation, behind the rotating shaft having the focusing wheel. A spiral groove consisting of a spiral winding opposite to the part is provided, and this An eyepiece driving body having a sphere intervening in the groove therein and having a helical groove penetrating the rotation axis is held movably along the axis of the rotation axis, and a side of the rotation axis. The eyepiece lens frames of the left and right optical systems are linked with the eyepiece driver via a relay connecting member that guides the movement of the left and right optical systems that are capable of moving away from each other and approaching each other. An extension mechanism of an optical system in compact binoculars. 5. A helical portion having a constant pitch is provided in front of a rotary shaft having a focusing wheel, and the rotary shaft is screwed to an objective lens driving body having a helical screw screwed into the helical portion. And the objective lens driving body is propelled along the axis thereof by the rotation of the rotation shaft, and a spiral groove having a spiral winding opposite to the spiral portion is provided behind the rotation shaft. The spiral groove is steeply inclined at the starting point side of the feeding operation of the optical system due to the rotation of the rolling wheel, and is gradually inclined at the end side of the feeding operation, a sphere intervening in this groove is installed, and the spiral groove is provided. The eyepiece driving body having the rotating shaft provided therein is held so as to be propelled along the axis of the rotating shaft by the rotation of the rotating shaft, and is separated from each other toward the side of the rotating shaft. , A relay series that guides the movement of the left and right optical systems that made it possible to approach Via a tie member, link each objective lens barrel of the left and right optical systems with the objective lens driver,
An extension mechanism of an optical system in compact binoculars, wherein each eyepiece lens frame of the left and right optical systems is linked with the eyepiece driver. 6. A rotary shaft having a focusing wheel,
A spiral groove having a steep slope at the starting point side of the extending operation of the optical system due to the rotation of the rotating wheel and a gentle inclination at the end side of the extending operation was provided, a sphere intervening in this groove was provided, and the spiral groove was provided. The left and right optics, which hold the optical system driving body through which the rotating shaft has penetrated so as to be movable along the axis of the rotating shaft, and which can be separated and approached toward the side of the rotating shaft. Each of the lens frames of the left and right optical systems is linked to the optical system driving body via a relay connecting member for guiding the movement of the system, and the optical system driving bodies are arranged in opposite directions of the relay connecting member. An extension mechanism of an optical system in compact binoculars, wherein the movement is slidably held. 7. A helical groove having a steep slope at the starting point side of the extending operation of the optical system due to rotation of the rotating wheel and a gentle slope at the end side of the extending operation is provided on a rotating shaft having a focusing wheel. An optical system driving body having a sphere intervening in the groove and having the helical groove penetrating the rotative shaft is movably held along the axis of the rotative shaft; Toward the side of, through a relay connecting member that guides the movement of the left and right optical systems that are separated from each other and approached, each lens frame of the left and right optical systems is linked with the optical system driver. A compact type, wherein the optical system driving body includes a holding member for pressing the sphere toward the spiral groove, and the holding member includes a holding piece for supporting the relay connection member. Extension mechanism of optical system in binoculars. 8. A rotating shaft having a wheel for focusing, a spiral groove provided on the rotating shaft, a sphere interposed in the spiral groove, and the sphere being held inside the helical groove. An optical system driving body having the rotating shaft penetrated therein, and the left and right optical systems in the left and right directions orthogonal to the axial direction of the rotating shaft, are also simultaneously separated from each other, or are moved closer to each other. A relay connection member protruding from a part of each lens frame of the optical system toward the direction of the other optical system, holding these relay connection members, and separating the respective relay connection members in directions opposite to each other. Or a stationary housing supporting the approaching movement and occupying between the left and right optical systems, wherein the spiral groove has a large pitch steeply inclined on the side of the feed start point of the left and right optical systems. So that it has a small pitch with a gentle slope on the side of the feed end. The relay connection member is linked to the optical system driving body, and the optical system driving body rotates in the immovable housing with the rotation of the rotating shaft. The left and right optical systems are moved in the direction of their optical axes in accordance with the operation propelled in the direction of the axis of the shaft, and the moving operation is performed rapidly and gradually in the early stage of feeding. A moving mechanism for an optical system in compact binoculars, characterized in that the moving speed is reduced so that the moving operation is slow in a focusing area near the end of the moving. 9. A rotating shaft having a wheel for focusing, a spiral portion having a constant pitch provided in front of the rotating shaft, and an objective lens driver having a spiral screwed with the spiral portion. A helical groove located on the rotating shaft, which is located behind the helical portion and has a helical winding opposite to the helical portion, a sphere intervening in the helical groove, and holding the sphere inside, the helical groove The provided eyepiece driving body penetrating the rotation axis, and the left and right optical systems in the left and right directions orthogonal to the axis direction of the rotation axis, also simultaneously separated from each other, or to approach, A relay connecting member protruding from a part of each objective lens frame in the optical system toward the direction of the other objective lens frame, and a respective one from each part of each eyepiece lens frame in the left and right optical systems; Relay joint projecting toward the eyepiece lens frame Material, holding these relay connecting members, separating the respective relay connecting members in opposite directions,
Or an immovable housing that occupies between the left and right optical systems while supporting the approaching movement, and the spiral groove has a large pitch that forms a steep slope on the side of the feed start point of the left and right optical systems, The relay connection member is formed by changing the pitch sequentially so as to have a small pitch that forms a gentle inclination on the side of the feeding end, and the relay connecting member is linked to the objective lens driving body and the eyepiece driving body, and the rotation is performed. Along with the rotation of the shaft in the same direction, the objective lens driver is driven forward along the axis of the rotation axis in the stationary housing, and the eyepiece driver is moved in the axis direction of the rotation axis. In response to these operations, the respective objective lenses of the left and right optical systems are moved forward in the direction of their optical axes, and at the same time, the respective eyepieces of the left and right optical systems are moved along their optical axes. Move backward in the direction Backward movement of the eye lens,
The optical system in the compact binoculars is characterized in that the movement is made rapidly in the early stage of the feeding, and the moving speed is gradually reduced so that the moving operation becomes slow in the focusing area near the end of the feeding. Feeding mechanism.