JP2006133623A - Binoculars - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To increase design flexibility in binoculars that have lens hoods. <P>SOLUTION: The left lens hood 3 movable forward and backward is disposed between a barrel body 50 and a lens barrel 40. When the left lens hood 30 is stored into a binocular body 10, only a hood cover 301 that covers the leading end part of the left lens hood 30 is exposed from the binocular body 10. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to binoculars, and more particularly to binoculars equipped with a movable lens hood.

  In the field of terrestrial telescopes and the like, there are many products equipped with a lens hood to prevent light entering the main body cylinder in the vicinity of the objective lens and to prevent the objective lens from raindrops.

  As a conventional technique, there is a binocular telescope (hereinafter referred to as binoculars) provided with a movable lens hood that can move in the front-rear direction of the telescope (see Japanese Patent Application Laid-Open No. 8-101349).

The binoculars include a movable lens cover provided outside the external cover of the binoculars and arranged to cover the objective lens, and a mechanism for moving the lens cover to a predetermined position in conjunction with the movement of the lens hood on the external cover. And.
JP-A-8-101349

  However, in the case of binoculars equipped with a lens hood on the outside of the outer cover, the outer surface of the outer cover has a function of guiding the lens hood, so the degree of freedom of the shape of the outer cover in terms of function (degree of freedom in design) Was low.

  The present invention has been made in view of such circumstances, and an object thereof is to provide binoculars having a lens hood capable of increasing the degree of freedom in design.

  In order to solve the above-described problem, the invention according to claim 1 includes a left and right main body cylinder, a lens barrel accommodated in each of the left and right main body cylinders and holding an objective lens, and the main body cylinder and the lens barrel. And an accommodating portion for accommodating a lens hood so as to be movable in the optical axis direction of the objective lens.

  According to a second aspect of the present invention, in the binoculars according to the first aspect, the lens hood is guided on an outer peripheral surface of the lens barrel or an inner peripheral surface of the main body tube.

  According to a third aspect of the present invention, in the binoculars according to any one of the first and second aspects, a main body cylinder side stopper portion is provided on the inner peripheral surface of the main body cylinder to restrict the rearward movement of the lens hood. In addition, a main body cylinder side stopper portion for restricting the forward movement of the lens hood is provided on the outer peripheral surface of the lens barrel.

  The invention according to claim 4 is the binoculars according to any one of claims 1 to 3, further comprising position holding means for holding the lens hood at an arbitrary position in the front-rear direction.

  According to a fifth aspect of the present invention, the binoculars according to the fourth aspect of the invention is a friction member that generates a frictional force between the lens hood and the lens barrel or between the lens hood and the main body cylinder. It is characterized by that.

  According to a sixth aspect of the present invention, in the binoculars according to any one of the first to fifth aspects, a polo-type prism is provided between the objective lens and an eyepiece arranged on the same optical axis as the objective lens. And the distance between the left and right objective lenses is narrower than the distance between the left and right eyepieces.

  According to the binoculars of the present invention, the degree of freedom in designing binoculars having a lens hood can be increased.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a conceptual diagram illustrating an optical system of Porro prism binoculars. FIG. 1 shows only the left optical system. FIG. 1 is a view showing a general Porro prism binocular. The Porro prism binoculars are of a type in which the distance between the left and right objective lenses is wider than the distance between the left and right eyepieces. The porosprism binoculars and the poroprism binoculars in FIG. 2 and subsequent figures have the opposite relationship between the distance between the left and right objective lenses and the distance between the left and right eyepieces, and the appearances and the like are different.

  In the Porro prism binoculars, a Porro prism PP is disposed between the objective lens 45 and an eyepiece lens EP disposed on the same optical axis L as the objective lens 45.

The polo-type prism PP is composed of a right-angle prism P1 and a right-angle prism P2, and returns the image reversed by the objective lens to the eyepiece.
FIG. 2 is a perspective view of the binoculars according to the first embodiment of the present invention.

  The binoculars are Porro prism binoculars, and the distance between the left and right objective lenses 45 is narrower than the distance between the left and right eyepieces. This binocular includes a binocular main body 10, a right lens hood (lens hood) 20, and a left lens hood (lens hood) 30.

  The outer surface of the binocular main body 10 is covered with an appearance cover 60. The appearance cover 60 is formed with irregularities so that it can be easily held.

  The right lens hood 20 can be pulled out from the binocular main body 10 by picking a right hood cover (drawer portion) 201 described later and pulling it to the front of the binocular main body 10.

  Similarly, the left lens hood 30 can be pulled out from the binocular main body 10 by grasping the left hood cover (drawer) 301 and pulling it forward (see FIG. 2).

  The maximum size in the front-rear direction of both lens hoods 20 and 30 is determined by the positions of the polo-type prism PP (see FIG. 1) and the objective tip of the binoculars. When the lens hood 30 is completely pushed into the binocular main body 10, the rear side end of the lens hood 30 is prevented from coming into contact with the polo-type prism PP.

  Hereinafter, the structure of the lens hood will be described. Since the right lens hood 20 and the left lens hood 30 have the same structure, only the left lens hood 30 will be described below.

  FIG. 3 is a broken cross-sectional view of the left part of the binoculars. FIG. 3A shows a state in which the left lens hood is housed in the binocular main body, and FIG. 3B shows the left lens hood pulled out from the binocular main body. FIG.

  The binocular main body 10 includes a filter 5, an objective lens 45, a lens barrel 40 that holds the objective lens 45, a lens barrel body (main body cylinder) 50 that holds the lens barrel 40, a Porro prism PP, and a lens barrel body 50. And an outer appearance cover 60 that covers the outer peripheral surface.

  The objective lens 45 is positioned by a step portion formed on the inner peripheral surface of the lens barrel 40 and is fixed by a presser ring 46. The filter 5 is screwed onto the inner peripheral surface of the front end portion of the lens barrel 40. The left lens hood 30 is accommodated in the accommodating portion S between the lens barrel 40 and the lens barrel body 50 so as to be movable in the optical axis direction of the objective lens 45.

  The left hood cover 301 is screwed into the front end portion of the left lens hood 30. A felt 303 (friction member) as a position holding means is attached to the groove 304 formed on the inner peripheral surface of the protrusion 309 of the left lens hood 30 with an adhesive.

  The left lens hood 30 is guided by the outer peripheral surface 402 of the lens barrel 40 and slides in the front-rear direction.

  On the outer peripheral surface 402 of the lens barrel 40, a main body cylinder side stopper portion 401 that restricts the forward movement of the left lens hood 30 is provided.

  Further, a main body cylinder side stopper portion 501 for restricting the rearward movement of the left lens hood 30 is provided on the inner peripheral surface of the housing body 50.

  The maximum pull-out amount of the left lens hood 30 is determined by the relationship between the position of the main body cylinder side stopper portion 401 and the position of the main body cylinder side stopper portion 501.

  The left hood cover 301 is screwed to the outer peripheral surface of the front end portion of the left lens hood 30. The rear end surface of the left hood cover 301 is positioned on the front end surface of the exterior cover 60 when the hood is stored.

  When the left lens hood 30 is stored in the binocular main body 10, the left hood cover 301 is exposed.

  At this time, excessive insertion of the left lens hood 30 is prevented by abutting the rear end surface 306 of the protrusion 309 against the main body cylinder side stopper 501 (see FIG. 3A).

  When pulling out the left lens hood 30 from the binocular main body 10, it is only necessary to grasp the outer periphery of the left hood cover 301 and pull it forward (to the left in FIG. 3). At this time, the lens hood 30 can be pulled without interfering with the filter 5, and the lens hood 30 can be pulled out from the binocular main body 10 without changing the position of the filter 5.

  At this time, friction force is generated between the left lens hood 30 and the housing body 50 by the felt 303, and the left lens hood 30 is not moved by its own weight.

  By causing the front end surface 305 of the protrusion 309 of the left lens hood 30 to abut against the main body cylinder side stopper 401, the left lens hood 30 is prevented from coming off (see FIG. 3B).

  According to this embodiment, when the left lens hood 30 is housed in the binocular main body 10, only the left hood cover 301 is exposed (see FIG. 3A), and the design applied to the outer cover 60 is the left lens. Since it is not covered with the hood 30, the beauty of the appearance of the binoculars is not impaired. In addition, since the surface area of the outer cover can be increased as compared with the case where the lens hood is disposed outside the lens barrel body 50, the area where the design can be performed is increased, and the degree of freedom in design (shape) can be increased. Furthermore, since the felt 303 functions as a friction member, the left lens hood 30 can be held at a desired position, and a situation in which the left lens hood 30 moves due to its own weight can be prevented. Further, since the lens hood 30 is housed in the binocular main body 10, the binocular main body 10 can be held using the thumb, index finger, middle finger, ring finger, and little finger, and even the portable binoculars can securely hold the entire binocular. be able to.

  The friction member is not limited to the felt 303, and may be rubber, grease, or the like as long as it generates a frictional force.

  FIG. 4 is a broken sectional view of the left portion of the binoculars according to the first modification of the first embodiment, and FIG. 4A is a view showing a state in which the left lens hood is housed in the binocular main body. b) is a diagram showing a state in which the left lens hood is pulled out from the binocular main body. Portions common to the first embodiment are denoted by the same reference numerals and description thereof is omitted. Note that the filter 5 is omitted.

  This first modified example is different from the first embodiment in that an operation for storing the left lens hood 30A in the binocular main body 11 or withdrawing it from the binocular main body 11 is performed by the protrusion 302A.

  The protrusion 302A is integrally formed on the outer peripheral surface of the rear end portion of the left lens hood 30A. A guide groove 65 for guiding the protrusion 302A in the front-rear direction is formed in the appearance cover 60 and the lens barrel body 51. The arcuate portion at the tip of the protrusion 302A slightly protrudes from the guide groove 65 of the outer cover 60.

  When the left lens hood 30A is housed in the binocular main body 11, the protrusion 302A may be operated backward (to the right in FIG. 4) with the finger F (see FIG. 4 (a)).

  Further, when the left lens hood 30A is pulled out from the binocular main body 11, the protrusion 302A may be operated forward (to the left in FIG. 4) with the finger F (see FIG. 4B).

  According to the first modified example, the same effects as those of the first embodiment are obtained. In addition, since the protrusion 302A is provided on the appearance cover 60, the operability is further improved. Furthermore, since the entire lens hood 30A can be stored in the barrel body 51, the design is not deteriorated.

  FIG. 5 is a broken sectional view of the left side portion of the binoculars according to the second modification of the first embodiment, and FIG. 5A is a diagram showing a state in which the left lens hood is housed in the binocular body. b) is a diagram showing a state in which the left lens hood is pulled out from the binocular main body. Portions common to the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  This second modification is different from the first embodiment in that a seesaw switch 302B capable of preventing the movement of the left lens hood 30B housed in the binocular main body 12 is provided.

  The shape of the operation portion 32 of the seesaw switch 302B is substantially a waveform, and the operation portion 32 performs a seesaw operation around a fulcrum portion 32a provided on the appearance cover 60. A projection 32b that can be engaged with a recess 302a formed on the outer peripheral surface of the rear end of the left lens hood 30B is attached to one end of the operation unit 32 via a shaft 32c.

  A coil spring 33 is provided between the main body cylinder side stopper 501 of the lens barrel body 50 and the rear end surface 306 of the left lens hood 30B, and the left lens hood 30B is moved forward (leftward in FIG. 5) by the coil spring 33. Is always energized.

  The left lens hood 30B is pushed rearward (rightward in FIG. 5) against the urging force of the coil spring 33, and the left lens hood 30B is housed in the binocular main body 12. Then, one end of the operation unit 32 is pushed down to project the projection 32b. The left lens hood 30B can be reliably prevented from moving by engaging the concave portion 302a with the concave portion 302a. (See FIG. 5 (a)).

  When the other end of the operation unit 32 is pushed down, the engagement between the projection 32b and the recess 302a is released, and the left lens hood 30 can be easily pulled out from the binocular main body 12 by the biasing force of the coil spring 33 (FIG. 5). (See (b)).

  According to this second modification, the same effects as those of the first embodiment can be obtained, and the movement of the left lens hood 30B can be reliably prevented.

  FIG. 6 is a broken sectional view of the binoculars according to the second embodiment of the present invention. The same parts as those of the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  This embodiment is different from the first embodiment in that a click mechanism is provided as a position holding means between the left lens hood 31 and the lens barrel 41.

  Click grooves 411 are provided on the outer peripheral surface of the lens barrel 41 at predetermined intervals.

  A leaf spring 70 having one end supported by the left lens hood 31 is disposed in a notch 313 formed at the rear end of the left lens hood 31. An arc-shaped click portion 70 </ b> A formed at the other end of the leaf spring 70 engages with the click groove 411.

  The click groove 411 and the leaf spring 70 constitute a click mechanism.

  A click mechanism may be provided between the left lens hood 31 and the lens barrel 50.

  The click groove may be provided on the inner peripheral surface of the barrel body 50.

  According to this embodiment, the same effect as that of the first embodiment can be obtained, and the left lens hood 31 can be reliably fixed at a desired position.

  FIG. 7A is a broken sectional view of the left portion of the binoculars according to the third embodiment of the present invention, and FIG. 7B is a sectional view taken along the line bb of FIG. 7A. In addition, the same code | symbol is attached | subjected to the part which is common in 1st Embodiment, and the description is abbreviate | omitted. Further, in FIG. 7B, the appearance cover 60 is not shown.

  In this embodiment, a click mechanism as a position holding means is provided between the left lens hood 32 and the lens barrel 42, and the left lens hood 32 is moved in the front-rear direction by relatively moving the cam screw 422 along the cam groove 323. This is different from the first embodiment in that it is moved.

  Click grooves 421 are provided on the outer peripheral surface of the lens barrel 42 at equal intervals in the circumferential direction.

  A leaf spring 71 is disposed in a notch 326 formed at the rear end of the left lens hood 32. An arc-shaped click part 71 </ b> A formed in the middle of the leaf spring 71 engages with the click groove 421.

  The click groove 421 and the leaf spring 70 constitute a click mechanism.

  A cam groove 323 is provided in the left lens hood 32. The cam groove 323 extends obliquely from one end of the left lens hood 32 toward the other end.

  A head 422a of a cam screw 422 that engages with the front end portion of the lens barrel 42 is engaged with the cam groove 323 with substantially no play. A cam mechanism is configured by the cam groove 323 and the cam screw 422. The head 422a slides between the start point 324 and the end point 325 along the cam groove 323 as the left lens hood 32 rotates (see FIG. 7B).

  By the cam mechanism, the left lens hood 32 is driven forward and backward in the optical axis direction (front-rear direction) while rotating.

  According to the cam mechanism, since the left lens hood 32 does not move in the front-rear direction unless the left lens hood 32 is rotated, the left lens hood 32 is pulled out and placed on a table with the objective lens side down. However, the pull-out amount of the left lens hood 32 does not change due to the weight of the binocular main body 13.

  According to this embodiment, the same effect as that of the first embodiment can be obtained, and the pulled-out state can be more reliably maintained than that of the first embodiment.

  A click mechanism may be provided between the left lens hood 32 and the lens barrel 52.

  FIG. 8 is a broken sectional view of the left side portion of the binoculars according to the fourth embodiment of the present invention. The same reference numerals are given to the same portions as those in the first embodiment, and the description thereof is omitted.

  This embodiment is different from the first embodiment in that the left lens hood 33 is guided to the inner peripheral surface 308 of the lens barrel body 53.

  The binocular main body 14 includes an objective lens 45, a lens barrel 43 that holds the objective lens 45, a lens barrel body 53 that holds the lens barrel 43, and an appearance cover 60 that covers the outer peripheral surface of the lens barrel body 53.

  The objective lens 45 is positioned by a step portion formed on the inner peripheral surface of the lens barrel 43 and is fixed by a presser ring 46.

  The left lens hood 33 is housed between the lens barrel 43 and the lens barrel body 53.

  On the inner peripheral surface of the front end portion of the left lens hood 33, a cue portion 331 (drawer portion) that protrudes in the optical axis L direction is formed. The clue 331 is used to pull out the left lens hood 33.

  A felt (friction member) 333 is attached to the groove 334 formed on the inner peripheral surface of the protrusion 339 of the left lens hood 33 with an adhesive. The protrusion 339 is formed on the left lens hood 33 and protrudes inward.

  A frictional force is generated between the left lens hood 33 and the housing body 53 by the felt 333, so that the left lens hood 33 can be prevented from moving due to its own weight.

  The left lens hood 33 is guided by the inner peripheral surface 532 of the barrel body 53 that contacts the outer peripheral surface 335 and slides in the front-rear direction.

  On the outer peripheral surface of the lens barrel 43, a main body cylinder side stopper portion 431 for restricting the forward movement of the left lens hood 33 is provided. By causing the front end surface 335 of the protrusion 339 of the left lens hood 33 to abut against the main body cylinder side stopper 431, the left lens hood 33 is prevented from coming off.

  Further, a main body cylinder side stopper portion 531 for restricting the rearward movement of the left lens hood 33 is provided on the inner peripheral surface of the housing body 53. Excessive insertion of the left lens hood 33 is prevented by abutting the rear end surface 336 of the protrusion 339 against the main body cylinder side stopper portion 531.

  The maximum pull-out amount of the left lens hood 33 is determined by the relationship between the position of the main body cylinder side stopper 431 and the position of the main body cylinder side stopper 531.

  According to this embodiment, the same effects as those of the first embodiment can be obtained.

  Note that the click mechanism of the second embodiment may be applied to this embodiment, or the click mechanism and cam mechanism of the third embodiment may be applied. By providing the above mechanism, the same effects as those of the second and third embodiments can be obtained.

  Moreover, it is preferable to apply the present invention to a binocular of a type in which the distance between the left and right objective lenses is narrower than the distance between the left and right eyepieces, as in the above embodiments. In the case of this type of binoculars, the length and area of the outer cover around the objective lens are small, and it is difficult to provide a lens hood on the outer periphery of the outer cover. In the present invention, since the lens hood can be stored inside the exterior cover, the lens hood can be stored without deteriorating the design and ease of holding. This binocular has a Porro prism and refracts the light branched by the Porro prism inward and leftward and rightward (it is not configured to refract the light branched by the Porro prism outwardly in the right and left).

FIG. 1 is a conceptual diagram illustrating an optical system of Porro prism binoculars. FIG. 2 is a perspective view of the binoculars according to the first embodiment of the present invention. FIG. 3 is a broken sectional view of the left part of the binoculars. FIG. 4 is a broken sectional view of the left part of the binoculars according to the first modification of the first embodiment. FIG. 5 is a broken sectional view of the left side portion of the binoculars according to the second modification of the first embodiment. FIG. 6 is a broken sectional view of binoculars according to a second embodiment of the present invention. FIG. 7A is a broken sectional view of the left portion of the binoculars according to the third embodiment of the present invention, and FIG. 7B is a sectional view taken along the line bb of FIG. 7A. FIG. 8 is a broken sectional view of the left part of the binoculars according to the fourth embodiment of the present invention.

Explanation of symbols

30, 30A, 30B, 31, 32, 33 Left lens hood 40 Lens barrel 45 Objective lens
50, 51, 52, 53 Lens barrel body (lens barrel)
70, 71 Leaf spring 201, 301 Hood cover (drawer)
303 felt (position holding means)
308 Inner peripheral surface 331 Cue (drawer)
401, 431 Body cylinder side stopper part 402 Outer peripheral surface 411, 421 Click groove 501, 531 Body cylinder side stopper part EP Eyepiece PP PP Polo type prism S Storage part

Claims (6)

  Left and right main body cylinders, lens barrels housed in the left and right main body cylinders, respectively, and a lens hood movable between the main body cylinder and the lens barrel in the optical axis direction of the objective lens A binoculars characterized by comprising a storage unit for storing the camera.   2. The binoculars according to claim 1, wherein the lens hood is guided on an outer peripheral surface of the lens barrel or an inner peripheral surface of the main body tube. On the inner peripheral surface of the main body cylinder, there is provided a main body cylinder side stopper portion that restricts movement of the lens hood to the rear,
3. The binoculars according to claim 1, wherein a main body cylinder side stopper portion for restricting the forward movement of the lens hood is provided on an outer peripheral surface of the lens barrel.   The binoculars according to any one of claims 1 to 3, further comprising position holding means for holding the lens hood at an arbitrary position in the front-rear direction.   5. The binoculars according to claim 4, wherein the position holding means is a friction member that generates a frictional force between the lens hood and the lens barrel or between the lens hood and the main body cylinder.   A polo-type prism is arranged between the objective lens and an eyepiece arranged on the same optical axis as the objective lens, and the distance between the left and right objective lenses is made smaller than the distance between the left and right eyepieces. The binoculars according to any one of claims 1 to 5.

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