JP2008020794A - Lens cap - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lens cap which hardly falls from the lens part of a telescope. <P>SOLUTION: A lens protection cover 3 constituting the lens cap 1 has a protection part 31 and a fitting part 32. The protection part covers the eyepiece part of a right lens barrel, and the fitting part has a fitting part main body 32a and a tab part 32b that is a pressing member. The tab part 32b is housed in a notch 32c, and its one end is coupled with the fitting part main body, and the tab part can be rocked with its one end as center. Two projections 32d are formed on the inner peripheral surface of the fitting part main body. A projection 32e is formed on the inner peripheral surface of the tab part, and the projection parts are engaged in an annular groove formed on the outer peripheral surface of the eyepiece. By engaging or disengaging the projection parts in accordance with the rocking operation of an operation part, the lens cap is attached/detached. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a lens cap that protects a lens portion of a telescope.

2. Description of the Related Art Conventionally, an eyepiece cover that includes two cover portions that are rotatably connected by a joint is known.
Utility Model Registration No. 3066467

  For example, when carrying binoculars, if the external force is applied to the eyepiece cover, the eyepiece cover may fall off.

  The present invention has been made in view of such circumstances, and an object thereof is to provide a lens cap that does not easily fall off from the lens portion of the telescope.

  In order to solve the above-described problem, a lens cap according to a first aspect of the present invention includes a lens protective cover that can be attached to and detached from the outer peripheral surface of the front end portion of the lens portion, and an outer periphery of the front end portion of the lens portion that is coupled to the lens protective cover. A pressing member that can come into contact with the surface, and a locking member that presses the pressing member against the outer peripheral surface of the lens portion or releases the pressing state.

  According to a second aspect of the present invention, in the lens cap according to the first aspect, the pressing member is a tab portion.

  According to a third aspect of the present invention, in the lens cap according to the first or second aspect, the lens protective cover is a pair of left and right lenses, and is rotated in parallel with the optical axis direction of the lens unit at an intermediate position between the left and right lens protective covers. It is connected to be rotatable around a central axis.

  According to a fourth aspect of the present invention, in the lens cap according to the third aspect, the lock member is a knob disposed so as to be switchable at a connecting portion of the pair of left and right lens protective covers, and the movement of the knob is controlled by the lens portion. It has a transmission part which changes into the force which presses the said pressing member on the outer peripheral surface of this, and transmits to the said pressing member, It is characterized by the above-mentioned.

  According to a fifth aspect of the present invention, in the lens cap according to the third aspect, the lock member includes a knob swingably disposed at a connecting portion of the pair of left and right lens protection covers, and the movement of the knob is controlled by the lens portion. It has a transmission part which changes into the force which presses the said pressing member on the outer peripheral surface of this, and transmits to the said pressing member, It is characterized by the above-mentioned.

  According to a sixth aspect of the present invention, in the lens cap according to the third aspect, the lock member includes a knob that is movably disposed at a connecting portion of the pair of left and right lens protection covers, and the movement of the knob is controlled by the movement of the lens portion. It has a transmission part which changes into the force which presses the said pressing member on an outer peripheral surface, and transmits to the said pressing member, It is characterized by the above-mentioned.

  According to a seventh aspect of the present invention, in the lens cap according to the first to sixth aspects, the pressing member is a part of the lens protective cover.

  According to the present invention, it is possible to provide a lens cap that does not easily fall off from the lens portion of the telescope.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 is a rear view of a lens cap according to a first embodiment of the present invention, FIG. 2 is a cross-sectional view taken along line II-II in FIG. 1, and FIG. 3 shows a lock member of the lens cap shown in FIG. FIG. 4A is a sectional view showing the locked state, FIG. 4B is a sectional view showing the unlocked state, and FIG. 4 shows the operation of the lens protective cover of the lens cap shown in FIG. a) is a front view showing a state where the lens protection cover is most widened, and FIG. 5B is a front view showing a state where the lens protection cover is made the smallest.

  As shown in FIGS. 1 to 3, the lens cap 1 includes a lens protection cover 3, a lens protection cover 4, and a lock member 7. The lens cap 1 is for binoculars 21.

  The lens protection cover 3 is made of hard plastic and includes a protection part 31, a fitting part 32, an arm part 33, and a connection part 34.

  The protection part 31 has a disc shape and covers the eyepiece part 24 of the right lens barrel 22.

  The fitting portion 32 is substantially cylindrical, is formed on one surface of the protection portion 31, and is fitted on the outer peripheral surface of the eyepiece lens portion 24. The fitting part 32 has a fitting part main body 32a and a tab part 32b which is a pressing member. The fitting portion main body 32a has a notch 32c. The tab part 32b is accommodated in the notch 32c, and one end thereof is connected to the fitting part main body 32a. The tab portion 32b can swing around its one end. Two protrusions 32d are formed on the inner peripheral surface of the fitting portion main body 32a. A protrusion 32e is formed on the inner surface of the tab portion 32b. The protrusions 32d and 32e engage with an annular groove 24a formed on the outer peripheral surface of the eyepiece lens portion 24, but these are not necessarily required. A string thread 35 is formed on the outer peripheral surface of the fitting portion 32.

  In the present embodiment, the tab portion 32b, which is a pressing member, is integrated with the lens protective cover 3, but the pressing member is not necessarily integrated with the lens protective cover, and an independent pressing member is attached to the lens protective cover. You may make it like (The tab part 42b mentioned later is also the same).

  The arm part 33 is interposed between the protection part 31 and a disk-like part 34a described later.

  The connecting part 34 has a disk-like part 34a and four peripheral wall parts 34b. A hole 34c is formed at the center of the disk-shaped portion 34a. The peripheral wall portion 34b is formed on one surface of the disc-shaped portion 34a. A knurl 34d is formed on the outer peripheral surface of the peripheral wall 34d. The outer peripheral surface of the peripheral wall portion 34d is in contact with the inner peripheral surface of the connecting portion 44 described later. A claw 34e is formed at the tip of the peripheral wall portion 34d (see FIG. 3. For convenience, the claw 34e is not shown in FIGS. 1 and 2). An annular protrusion 34f is formed on the other surface of the disk-shaped portion 34a. The annular protrusion 34f is concentric with the disk-shaped portion 34a.

  The lens protective cover 4 has substantially the same configuration as the lens protective cover 3. The lens protection cover 4 is made of hard plastic and includes a protection part 41, a fitting part 42, an arm part 43, and a connection part 44.

  The protection part 41 has a disc shape and covers the eyepiece part 25 of the left lens barrel 23.

  The fitting portion 42 is substantially cylindrical, is formed on one surface of the protection portion 41, and is fitted on the outer peripheral surface of the eyepiece lens portion 25. The fitting part 42 has a fitting part main body 42a and a tab part 42b which is a pressing member. The fitting portion main body 42a has a notch 42c. The tab part 42b is accommodated in the notch 42c, and the one end part is connected with the fitting part main body 42a. The tab portion 42b can swing around its one end. Two protrusions 42d are formed on the inner peripheral surface of the fitting portion main body 42a. A protrusion 42e is formed on the inner side surface of the tab portion 42b. The protrusions 42d and 42e engage with the annular groove 25a formed on the outer peripheral surface of the eyepiece lens portion 25, but these are not necessarily required. A string thread 45 is formed on the outer peripheral surface of the fitting portion 42.

  The arm part 43 is interposed between the protection part 41 and the connecting part 44.

  The connecting portion 44 is cylindrical. Two cutouts 44a are formed in the connecting portion 44 for passing a band-shaped body 72 described later. A stopper 44 b is formed on the inner peripheral surface of the connecting portion 44. A knurling 44 d is formed on the inner peripheral surface of the connecting portion 44. The knurling 44 d meshes with the knurling 34 d of the lens protection cover 3.

  The connecting portion 34 and the connecting portion 44 constitute a connecting portion in the claims.

  As shown in FIG. 3, the lock member 7 includes a knob 71 and a belt-like body (transmission portion) 72.

  The knob 71 has an operation part 71a and a shaft part 71b. The operation portion 71a is disposed on the other surface of the disc-shaped portion 34a, and swings like a seesaw with the central portion as a fulcrum. Both end surfaces of the operation portion 71a are in pressure contact with the inner peripheral surface of the annular protrusion 34f. The shaft portion 71b is formed at the center of the operation portion 71a. A slit 71c is formed in the shaft portion 71b. The shaft portion 71b is passed through the hole 34c.

  The strip 72 is made of flexible plastic. One end of the strip 72 is coupled to the tab portion 32b, and the other end of the strip 72 is coupled to the tab portion 42b. The belt-like body 72 has a bow shape. The belt-like body 72 is inserted into the slit 71c of the shaft portion 71b. A cap 73 is attached to the distal end portion of the shaft portion 71b so that the belt-like body 72 does not fall out of the slit 71c.

  Four peripheral wall portions 34 b of the lens protection cover 3 are inserted into the connecting portion 44. As a result, as shown in FIGS. 4A and 4B, the lens protection covers 3 and 4 are rotatably connected with the central axes of the connecting portions 34 and 44 as the rotation central axes. The lens protective cover 3 is prevented from falling off the lens protective cover 4 by engaging a claw 34e formed at the tip of the peripheral wall portion 31b with one end surface of the connecting portion 44. Further, since the knurl 34d of the peripheral wall portion 34b and the knurl 44d of the connecting portion 44 mesh with each other, the set interval is maintained no matter how the interval between the protection portions 31 and 41 of the lens protection covers 3 and 4 is set. It is. The rotation of the lens protection covers 3 and 4 is limited by the stopper 44b and the peripheral wall portions 34b located on both sides of the stopper 44b.

  Next, the operation of this lens cap will be described.

  When one end portion of the operation portion 71a is pressed as indicated by an arrow in FIG. 3A, one end surface of the operation portion 71a is pressed against the inner peripheral surface of the annular protrusion 34f, and the state is maintained. At this time, the shaft portion 71b presses the strip 72 from the position indicated by the imaginary line in FIG. 1 to the position indicated by the solid line. As a result, the tab portions 32b and 42b move from the position indicated by the imaginary line in FIG. 1 to the position indicated by the solid line, and are pressed against the outer peripheral walls of the eyepiece lens portions 24 and 25, respectively. At this time, the protrusions 32e and 42e of the tab portions 32b and 42b engage with the annular grooves 24a and 25a of the eyepiece lens portions 24 and 25, respectively. As described above, part of the lens cap 1 (the tab portions 32b and 42b) is pressed against the outer peripheral walls of the eyepiece lens portions 24 and 25, so that the lens cap 1 can be binocular even when an external force is applied to the lens cap 1. 21 is not easily removed.

  When the lock member 7 is in the state shown in FIG. 3A, when the other end portion of the operation portion 71a is pressed as shown by the arrow in FIG. 3B, the operation portion 71a swings and the operation portion 71a The pressure contact between the one end surface and the inner peripheral surface of the annular protrusion 34f is released, and the other end surface of the operation portion 71a is in pressure contact with the inner peripheral surface of the annular protrusion 34f, and the state is maintained. At this time, the shaft portion 71b also swings, and the shaft portion 71b pulls the belt-like body 72 from the position indicated by the solid line in FIG. 1 to the position indicated by the imaginary line. As a result, the tab portions 32b and 42b move from the position indicated by the solid line in FIG. 1 to the position indicated by the imaginary line, and are separated from the eyepiece lens portions 24 and 25, respectively. The engagement between the protrusions 32e and 42e and the annular grooves 24a and 25a is also released. The lens cap 1 can be easily removed from the binoculars 21 as described above.

  As described above, according to this embodiment, the lens cap 1 can be easily removed from the binoculars 21 by operating the lock member 7, and the lens cap 1 can be easily attached to the binoculars 21. Can be done.

  5A and 5B show a lock member and its peripheral portion of a lens cap according to a second embodiment of the present invention. FIG. 5A is a sectional view showing a locked state, and FIG. 5B is a sectional view showing a unlocked state. It is.

  Portions common to the first embodiment are denoted by the same reference numerals and description thereof is omitted. Only the main differences will be described below.

  In the case of the first embodiment, the knob 71 swings, but in the case of the second embodiment, the operation part 271a of the knob 271 has a disk-like part 34a as shown in FIGS. 5 (a) and 5 (b). It is slidably arranged on the other surface. As the operation unit 271a slides, the shaft 271b moves while maintaining a state substantially parallel to the optical axis direction of the eyepiece units 24 and 25. A frictional force is generated between the operation portion 271a and the disc-shaped portion 34a.

  According to the second embodiment, the same effect as that of the first embodiment can be obtained.

  6A and 6B show a lens cap according to the third embodiment. FIG. 6A is a plan view, FIG. 6B is a broken sectional view, FIG. 6C is a bottom view, and FIG. It is sectional drawing.

  The lens cap of this embodiment is composed of one protective cover.

  The lens cap 301 includes a lens protective cover 305 and a lock member 307. The lens cap 301 protects the eyepiece 28 of the telescope 27, for example.

  The lens protection cover 305 is made of plastic, and includes a protection portion 351, a fitting portion 352, and a pair of engagement portions (conduction portions) 353.

  The protection part 351 has a disc shape and covers the eyepiece part 28.

  The fitting portion 352 has a cylindrical shape, is formed on one surface of the protection portion 351, and is fitted on the outer peripheral surface of the eyepiece lens portion 28. A slit 352 a is formed in the fitting portion 352. Three protrusions 352 d are formed on the inner peripheral surface of the fitting portion 352. The protrusion 352d engages with the annular groove 28a formed on the outer peripheral surface of the eyepiece lens portion 28, but these are not necessarily required.

  The pair of engaging portions 353 are opposed to each other through the slit 352a. Each of the pair of engaging portions has an engaging piece portion 353a and a leg portion 353b. The engagement piece portion 353a has a substantially triangular plate shape. The leg portion 353b has a plate shape, and couples the engaging piece portion 353a to the fitting portion 352.

  The lock member 307 has a space 371 and a groove 372. The shape of the space portion 371 is substantially equal to the shape of the state when the space between the pair of engagement piece portions 353a is narrowed and brought into close contact. The space portion 371 accommodates a pair of engagement piece portions 353a. The groove 372 communicates with the space 371, and the pair of legs 353b are accommodated in the groove 372.

  As shown in FIG. 6B, when the lock member 307 is pressed in the optical axis direction as indicated by an arrow, the pair of engagement piece portions 353 a relatively move deeper into the space portion 371 of the lock member 307. At this time, the inner surface of the space portion 371 of the lock member 307 presses the pair of engagement piece portions 353a, the interval between the pair of engagement piece portions 353a is narrowed, and the fitting portion 352 is tilted inward. Accordingly, the fitting portion 352 is pressed against the outer peripheral surface of the eyepiece lens portion 28, and the protrusion 352d is fitted into the annular groove 28a of the eyepiece lens portion 28. The protrusion 352d and the annular groove 28a are not necessarily essential.

  According to the third embodiment, the same effect as that of the first embodiment can be obtained.

  7A and 7B show a lens cap according to the fourth embodiment, in which FIG. 7A is a broken sectional view, FIG. 7B is a front view showing a partially cut-out state, and FIG. 7C is a bottom view. It is.

  The lens cap 401 includes a lens protective cover 405 and a lock member 407. For example, the lens cap 401 protects an eyepiece of a telescope (not shown).

  The lens protection cover 405 is made of plastic, and includes a protection part 451, a fitting part 452, and a pair of engagement parts (transmission parts) 453.

  The protection part 451 is disk-shaped and covers the eyepiece part. A slit 451a is formed in the protection part 451. The slit 451a extends in the diameter direction of the protection part 451.

  The fitting portion 452 has a cylindrical shape and is fitted to the outer peripheral surface of the eyepiece lens portion. A slit 452a is formed in the fitting portion 452. The slit 452a is continuous with the slit 451a. Three protrusions 452 b are formed on the inner peripheral surface of the fitting portion 452. The protrusion 452b engages with an annular groove (not shown) formed on the outer peripheral surface of the eyepiece lens portion, but these are not necessarily required.

  The pair of engaging portions 453 are formed on one surface of the protection portion 451. The pair of engaging portions 453 are opposed to each other through the slit 451a. Each of the pair of engaging portions 453 includes an engaging piece portion 453a and a leg portion 453b. The engagement piece portion 453a has a substantially triangular plate shape. The leg portion 453b is plate-shaped and couples the engagement piece portion 353a to the protection portion 451.

  The lock member 407 has an engaging portion 471 and a press 472. The engaging part 471 faces the protective part 451. The engaging portion 471 has a space portion 471a. The shape of the space portion 471a is substantially equal to the shape in a state where the space between the pair of engagement piece portions 453a is narrowed and brought into close contact. A pair of engagement piece portions 453a is accommodated in the space portion 471a. The groove 471b communicates with the space portion 471a, and the pair of leg portions 453b are accommodated in the groove 471b. The pressing portion 472 is coupled to one end of the engaging portion 471 and faces the fitting portion 452.

  As shown in FIG. 7A, when the pressing portion 472 of the lock member 407 is pressed in the optical axis direction as shown by the arrow, the pair of engagement piece portions 453a are relatively moved to the back of the space portion 471a of the lock member 407. move on. At this time, the inner surface of the space portion 471a of the lock member 407 presses the pair of engagement piece portions 453a, the interval between the pair of engagement piece portions 453a is reduced, and the width of the slit 451a of the protection portion 451 is also reduced. The diameter of 451 becomes smaller. Accordingly, the fitting portion 452 is pressed against the outer peripheral surface of the eyepiece lens portion, and the protrusion 452b is fitted into the annular groove of the eyepiece lens portion.

  According to the fourth embodiment, the same effect as in the first embodiment can be obtained.

  In the first embodiment, the fitting portions 32 and 42 are constituted by the fitting portion main bodies 32a and 42a and the tab portions 32b and 42b. However, the lens protection covers -3 and 4 are formed of an elastic member such as rubber. In this case, the tab portions 32b and 42b are not always necessary.

  Moreover, although the above-mentioned embodiment is a lens cap for an eyepiece, the application of the present invention is not limited to the lens cap for an eyepiece, and can also be applied to a lens cap for an objective lens.

FIG. 1 is a rear view of a lens cap according to the first embodiment of the present invention. FIG. 2 is a sectional view taken along line II-II in FIG. FIG. 3 is a view showing a lock member and its peripheral portion of the lens cap shown in FIG. FIG. 4 is a view showing the operation of the lens protective cover of the lens cap shown in FIG. FIG. 5 is a view showing a lock member of a lens cap according to the second embodiment of the present invention and its peripheral portion. FIG. 6 is a view showing a lens cap according to the third embodiment. FIG. 7 is a view showing a lens cap according to the fourth embodiment.

Explanation of symbols

  1, 201, 301, 401: Lens cap, 3, 4: Lens protection cover, 305, 405: Lens protection cover, 32b, 42b: Tab portion, 34, 44: Connection portion, 7,307, 407: Lock member, 71, 271: Knob, 72: Band-shaped body (transmission part).

Claims (7)

A lens protective cover that can be attached to and detached from the outer peripheral surface of the front end of the lens unit, a pressing member that is coupled to the lens protective cover and that can contact the outer peripheral surface of the front end of the lens unit, A lens cap comprising: a lock member that presses against an outer peripheral surface and releases the pressed state.   The lens cap according to claim 1, wherein the pressing member is a tab portion.   The lens protection cover is a pair of left and right lenses, and is coupled so as to be rotatable about a rotation center axis parallel to the optical axis direction of the lens portion at an intermediate position between the left and right lens protection covers. The lens cap according to 1 or 2. The locking member is
A knob disposed so that the position of the pair of left and right lens protection covers can be switched;
The lens cap according to claim 3, further comprising: a transmission portion that converts the movement of the knob into a force for pressing the pressing member against an outer peripheral surface of the lens portion and transmits the force to the pressing member. The locking member is
A knob arranged to be swingable at the connecting portion of the pair of left and right lens protection covers;
The lens cap according to claim 3, further comprising: a transmission portion that converts the movement of the knob into a force for pressing the pressing member against an outer peripheral surface of the lens portion and transmits the force to the pressing member. The locking member is
A knob that is movably disposed at the connecting portion of the pair of left and right lens protection covers;
The lens cap according to claim 3, further comprising: a transmission portion that converts the movement of the knob into a force for pressing the pressing member against an outer peripheral surface of the lens portion and transmits the force to the pressing member.   The lens cap according to claim 1, wherein the pressing member is a part of the lens protective cover.

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