JPH08136977A - Lens cap - Google Patents

Abstract

PURPOSE: To provide a lens cap for protecting the photographing lens of a camera, etc., capable of preventing the play of the cap at the time of mounting the lens cap, improving operability with simple structure, facilitating a producing stage and contributing to the reduction of cost. CONSTITUTION: This lens cap attached by utilizing the engaging part on the inner periphery of the front end of a lens barrel is equipped with a lens cap main body 1, an engaging member 11 disposed in a state where it can slide in an outward direction from the center direction of the lens cap main body 1, an elastic member 17 energizing the engaging member 11 in the outward direction, a locking part 16 provided in the engaging member 11 and constituted so as to partially abut on the engaging part 19 on the inner periphery part of the front end of the lens barrel 18, and a pressing part 12 formed integrally with the engaging member 11 and operating the engaging member 11. The locking part 16 is constituted in a circular-arc shape, which is different in size from the circular-arc of the engaging part 19 of the inner periphery part of the front end of the lens barrel 18 with which the locking part 16 is engaged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens cap, and more particularly to a lens cap which is mounted by utilizing an engaging portion on an inner circumference of a front end of a lens barrel.

[0002]

2. Description of the Related Art In cameras and the like for taking photographs,
In order to protect the front surface of the taking lens of the camera or the like when not in use or during storage, various proposals have been conventionally made for the lens cap that covers the entire front surface of the taking lens at the front end of the lens barrel, and It has been put to practical use.

For example, Japanese Utility Model Publication No. 56-22181,
In the lens cap disclosed in Japanese Utility Model Laid-Open No. 61-165528, a pair of insertion parts are provided at positions opposite to each other on the peripheral edge of the lens cap body, and the cap side engagement parts are inserted into the pair of insertion parts. Insert a slide body that is slidably inserted into the side engaging portion, and press-fit the slide body to the inner circumference of the front end of the lens barrel by a biasing member that biases the slide body in the outward direction of the lens cap body. Then, the lens cap is attached to the front end of the lens barrel.

The shape of the locking portion of the sliding body which engages with the inner circumference of the front end of the lens barrel of the lens cap and the arc shape having the same diameter (R) as the diameter (R) of the inner circumference of the front end of the lens barrel. In addition, the shape of the pressing portion of the sliding body that crimps the inner circumference of the lens barrel front end portion of the lens cap is an arc shape having the same diameter (R1) as the diameter (R1) of the outer peripheral portion of the lens cap body. It was done like this.

It should be noted that FIGS. 14 to 16 are shown in FIG.
FIG. 14 is a diagram illustrating a lens cap disclosed in Japanese Patent Laid-Open No. 22181, FIG. 14 is an external perspective view of the lens cap, and FIG. 15 is a sectional view taken along the line AA of FIG. FIG. 16 is a vertical cross-sectional view of the main part of the lens cap, and FIG. 16 is a vertical cross-sectional view of the main part showing a state in which the lens cap is attached to the inner circumference of the front end of the lens barrel.

[0006]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, Japanese Utility Model Publication No. 56-22181 and Japanese Utility Model Publication No. 61-1655.
According to the means disclosed in Japanese Patent Publication No. 28, since the inner diameters of the locking portion of the sliding body and the front end portion of the lens barrel have the same diameter (R), the inner diameter of the front end portion of the lens barrel is increased. Since it is necessary to prepare the engaging parts such as the sliding body depending on the diameter of the circumference, the parts are dedicated and the manufacturing cost is increased.

Further, since a processing error or the like occurs at the time of processing the engaging portion of the sliding body, the diameter of the engaging portion of the sliding body and the inner circumference of the front end portion of the lens barrel have an arc shape with the same diameter (R). In that case, there is a problem in that it is difficult to make full contact between the engaging portion of the sliding body and the inner circumference of the front end of the lens barrel, and the contact point is not clear.

That is, as the lens caps disclosed in Japanese Utility Model Publication No. 56-22181 and Japanese Utility Model Publication No. 61-165528, an engaging member which is engaged with the inner circumference of the front end of the lens barrel and is crimped. As shown in FIG. 13, an arcuate shape of the engaging portion of the sliding body is an arcuate shape having the same diameter (R) as the diameter (R) of the screw groove 119 provided on the inner circumference of the front end of the lens barrel 118. In this case, the locking portion of the lens cap body is entirely crimped to the inner circumference of the front end portion of the lens barrel 118, and the lens cap body is screwed into the thread groove 11 on the inner circumference of the front end portion of the lens barrel 118.
Ideally, it should be securely attached to 9.

However, in an actual case, due to a processing error or the like generated at the time of processing the locking portion of the sliding body, the locking portion of the sliding body on the lens cap body side and the inner circumference of the front end portion of the lens barrel 118 are formed. Provided thread groove 11
Since the engagement depth of the engagement portion between the lens cap 9 and 9 becomes shallow, the lens cap is attached to the inner circumference of the front end portion of the lens barrel 118 in a loose state. There is a problem that it ends up.

Here, FIG. 17 is a longitudinal cross-sectional view of an essential part when the locking portion 116 of the sliding body 111 is ideally processed and is cut along a line along the OQ2 line or the OR2 line in FIG. FIG. 18 shows the above-mentioned slide 1
FIG. 19 is a view exemplifying a case where an error occurs during processing of the locking portion 116 of No. 11, and is a longitudinal cross-sectional view of a main part when cut along a line along the line OQ2 in FIG. 14 described above, and FIG.
Similar to FIG. 18, an exemplary case where an error occurs during processing of the locking portion 116 of the sliding body 111, and a longitudinal cross-sectional view of an essential part when cut along a line along the OR2 line in FIG. 14 is shown. It is a thing.

As shown in FIG. 17, when the locking portion 116 of the sliding body 111 of the lens cap is processed into an ideal shape as described above, the locking portion 116 of the lens cap is formed. The engaging groove and the engaging groove 119 on the inner circumference of the front end of the lens barrel are completely engaged with each other.

However, in actuality, as shown in FIGS. 18 and 19, the locking portion 1 is shown in the respective cross sections taken along the lines along the lines OQ2 and OR2 in FIG.
The engagement depths of the engaging portions of the locking groove 16 and the engaging groove 119 on the inner periphery of the front end of the lens barrel are different. For example, between the position α1 in FIG. 18 and the position α2 in FIG. Due to the processing error that occurs in (1), the play of the clearance β shown in FIGS. 18 and 19 is generated between the engagement groove of the engagement portion 16 and the engagement groove 119.

Further, the diameter (R) at the valley portion of the engaging groove 119 provided on the inner circumference of the front end portion of the lens barrel 118 is
Since the diameter varies depending on the diameter (R) of the inner circumference of the front end of the lens barrel 118, the locking portion 116 of the sliding body 111 of the lens cap is made to correspond to each lens barrel 118.
There is a problem that the diameter (R) of the locking groove must be created, and there is a problem that the manufacturing cost is increased due to the complexity of manufacturing due to this.

An object of the present invention is to solve the above problems of the prior art, to prevent rattling at the time of mounting the lens cap in a lens cap for protecting a taking lens of a camera or the like, and to simplify the manufacturing process. To provide a lens cap.

Further, even when the diameter (R) of the inner peripheral portion of the front end portion of the lens barrel is different, the engaging portion of the lens cap is not prepared corresponding to each lens barrel, but the same function is obtained. It is an object of the present invention to provide a lens cap that can reduce manufacturing costs and contribute to cost reduction by using a combination member.

Further, when the lens cap is attached to the front end of the lens barrel, the lens cap can be surely attached without easily coming off, and the lens cap has a simple structure and has good operability when attaching and detaching. To provide.

[0017]

A lens cap according to the present invention is a lens cap mounted by utilizing an engaging portion of an inner circumference of a front end portion of a lens barrel, wherein a lens cap body and a center of the lens cap body are provided. Direction, the engaging member disposed so as to be slidable in the outward direction, the elastic member for urging the engaging member in the outward direction, the engaging member, An engaging portion configured to partially abut the engaging portion, and a pressing portion that is provided integrally with the engaging member and that operates the engaging member, and It is characterized in that the locking portion has an arc shape and has a size different from the arc of the engaging portion on the inner circumference of the front end of the lens barrel with which the locking portion engages.

Then, in the lens cap mounted by utilizing the engaging portion formed by the thread groove on the inner circumference of the front end of the lens barrel, the lens cap can be slid outward from the center of the lens cap main body. And a locking portion which is disposed in a state and which manually operates the locking portion, and a locking portion which partially abuts the arc-shaped portion of the engaging portion formed by the thread groove on the inner circumference of the front end of the lens barrel. An engaging member and an elastic member for urging the engaging member in the outward direction are provided.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to one embodiment shown in the drawings. FIG. 1 is an external perspective view schematically showing the lens cap according to one embodiment of the present invention when viewed from the back side, and shows a state in which one sliding body of the lens cap is disassembled.

As shown in FIG. 1, the lens cap is composed of a lens cap body 1 integrally formed of synthetic resin or the like, and at least a pair of engaging members such as a sliding body 11 and the like.

That is, on the inner surface on the back side of the lens cap body 1, the protrusion 2 is provided so as to extend along the peripheral edge thereof, and the engagement couple 3 is provided on the outer peripheral side of the protrusion 2. Has been. Then, in the peripheral portion of the lens cap body 1, cutout portions 4 are formed at positions facing each other, and the sliding body 11 (details of which will be described later) is inserted in correspondence with the cutout portions 4. The insertion part 5 is formed. The insertion portion 5 has a sliding groove 7 formed in the facing surface portion of the wall bodies 6 facing each other and projecting along the radial direction of the lens cap body 1. One end of the sliding groove 7 is formed. The portion is open to the side of the cutout 4, and the other end is open to the inner side of the lens cap body 1. Further, a pair of locking protrusions 8 and a receiving piece 9 which are engaging portions and are located between the wall body 6 and the inner portion of the insertion portion 5 are provided in a protruding manner.

The upper surface of the locking projection 8 is inclined downward toward the outer side of the lens cap body 1, and one side surface of the locking projection 8 faces each other. In addition, the U-shaped receiving portion 10 is formed by the mutual opposing surfaces and one side surface of the receiving piece 9.

On the other hand, the sliding body 11 has a shape corresponding to the cutout shape of the cutout portion 4 of the lens cap body 1 or the arcuate shape of the cutout portion 4 (diameter R1; see FIG. 6; details will be described later). ) And a sliding portion having a circular arc shape (diameter R1a; see FIG. 6; details will be described later), and sliding that is integrally projected on both ends of the pressing portion 12 and is inserted into the sliding groove 7. It comprises a portion 13 and an elastically deformable locking piece 14 that is located between the sliding portion 13 and is continuous with the pressing portion 12. The locking piece 14 is staggered from the pressing portion 12. The engaging projection 15 is integrally projected on the inner surface of the tip of the locking piece 14.

A locking portion 16 is formed on one side surface of the pressing portion 12 by utilizing the end surface of the locking piece 14, and the locking portion 16 has a V-shaped locking groove. The shape of the engaging portion 16 seen from the back surface (details will be described later with reference to FIG. 6) is formed in an arc shape having a radius R2a smaller than the circumferential radius R2 of the engaging groove 19. . An elastic member 17 made of, for example, a spring is interposed between the insertion portion 5 and the sliding body 11. .

Next, from the disassembled state of the sliding body 11 shown in FIG. 1, the lens cap body 1 and the sliding body 1 are removed.
The procedure for assembling 1 and 1 will be described below.

First, one end portion of the elastic member 17 is inserted into the receiving portion 10, and then the sliding portion 13 of the sliding body 11 is inserted into the sliding groove 7 of the insertion portion 5 so that the elastic member 17 is inserted. Is located between the pressing portion 12 of the sliding body 11 and the receiving portion 10, and the sliding body 11 is directed toward the inner side of the lens cap body 1 against the elastic force of the elastic member 17. Slide by pressing.

At this time, the engaging projection 15 provided on the inner surface portion of the engaging piece 14 slides along the upper surface of the engaging projection 8 and is elastically pushed up, so that the engaging projection 15 moves.
When the vehicle gets over the locking projection 8, it is elastically restored. Then, due to this elastic return, the engagement projection 15 engages with the locking projection 8. As a result, the sliding body 11 is
It is incorporated in the insertion portion 5 of the lens cap body 1.

The sliding body 11 incorporated on the back side of the cap 1 is always urged in the outward direction of the lens cap body 1 by the elastic force of the elastic member 17. Due to the engagement between the locking projection 8 and the engagement projection 15, as shown in the longitudinal sectional view of FIG. 2 taken along the line OQ in FIG. 1 of the lens cap. , The locking portion 1
6 is slightly projected from the outer peripheral edge of the ridge 2, and the pressing portion 12 is held so as to be slightly projected from the peripheral side surface of the lens cap body 1.

The operation of the lens cap of the above-described embodiment having the above-described structure will be described below with reference to FIG. 3. FIG. 3 is a longitudinal sectional view of an essential part showing a state where the lens cap is attached to the inner circumference of the front end of the lens barrel of a camera or the like.

As shown in FIG. 3, a taking lens 20 is provided in the lens barrel 18 of a camera or the like. An engagement groove 19 that engages with the engagement groove provided in the engagement portion 16 of the lens cap is formed in the lens cap mounting portion on the inner circumference of the front end portion of the lens barrel 18. In addition,
The engagement groove 19 is generally formed by, for example, a screw groove for screwing a filter or the like.

In order to mount the lens cap on the inner circumference of the front end portion of the lens barrel 18, first, the pressing portions 12 of the pair of sliding bodies 11 are sandwiched so that the sliding body 11 is fixed to the lens cap. It is pressed toward the inner peripheral side of the main body 1 and the locking portion 16 is slid into the ridge 2.

Next, the engagement part 3 of the lens cap body 1 is engaged with the inner circumference of the front end portion of the lens barrel 18, so that the lens cap body 1 is crowned on the front end portion of the lens barrel 18. At the same time, the pressing force on the sliding body 11 is released.

By releasing this pressing force, the sliding body 1 is released.
1 is pressed and urged toward the outer side of the lens cap body 1 by the elastic urging force of the elastic member 17 provided therein, so that the locking portions 16 are respectively provided on the inner circumference of the front end portion of the lens barrel 18. Then, the locking groove of the locking portion 16 and the engaging groove 19 of the lens barrel 18 are engaged with each other.

FIG. 4 shows a state in which the lens cap is attached to the inner circumference of the front end portion of the lens barrel of a camera or the like, that is, in the state shown in FIG. 3 described above, cut along the line along the OQ line shown in FIG. FIG. 5 is an enlarged cross-sectional view at the time, and FIG. 5 shows the O of FIG.
The expanded longitudinal cross-sectional view at the time of cutting along the line along the R line is shown. Further, FIG. 6 is an enlarged view of a main part when the lens cap is attached to the front end of a lens barrel of a camera or the like, as viewed from the back side of the lens cap, and is a sliding body of the lens cap. The engaging portion between the inner circumference of the front end of the lens barrel and the inner circumference is shown.

As shown in FIG. 4, in the cross section taken along the line OQ line passing through the center of the sliding body 11 from the center point O of the lens cap, the engagement portion 16 of the sliding body 11 is engaged. Stop groove and engagement groove 19 at the front end of the lens barrel
Are engaged.

At this time, as shown in FIG. 5, in the section cut from the center point O of the lens cap along the straight line OR line passing through one end of the sliding body 11, the locking portion 16 is provided. The engaging groove is not engaged with the engaging groove 19.

That is, the locking portion 16 of the lens cap
The locking groove of is the engaging groove 19 on the inner circumference of the front end of the lens barrel.
It is adapted to partially abut.

Therefore, between the engagement groove of the engagement portion 16 and the engagement groove 19 caused by a processing error of the engagement groove of the engagement portion 16 in the direction of arrow 21 in FIGS. 4 and 5. The reduction of the engaging force, that is, the engaging force in the direction of the arrow 22 in FIGS. 4 and 5 is prevented.

Further, as shown in FIG.
At this point of the apex 23, the engaging groove of the engaging portion 16 and the engaging groove 19 are securely engaged with each other without any gap, without being affected by the processing error at the apex 23 of the arc shape of the engaging groove of the above. Will be done.

As described above, according to the above-described embodiment, when the lens cap is mounted on the lens barrel 18, the locking groove of the locking portion 16 of the lens cap is fitted in the lens barrel 18. In the engagement groove 19 of the inner peripheral portion of the front end of
Since the lens cap is partially depressed and is engaged at a definite point, the lens cap can be securely attached to the inner circumference of the front end of the lens barrel without being easily removed.

Regarding the attaching / detaching operation, the pressing portion 12 of the sliding body 11 of the lens cap is clamped and the crown is or is removed from the front end portion of the lens barrel 18, which is extremely simple. The lens cap can be attached and detached by operation.

When assembling the lens cap itself, the slide body 11 is inserted into the insertion portion 5 of the lens cap body 1, and the locking projection 8 on the lens cap body 1 side and the slide body 11 are inserted. Side engaging projection 15
Since it can be assembled only by engaging and assembling with, the workability is extremely good, and the assembling work can be performed without requiring a special assembling tool.

Therefore, it is possible to contribute to the reduction of the manufacturing cost, and the lens cap assembled as described above has the elastic member 17, the locking projections 8, and the receiving pieces 9.
Since all the protrusions such as are covered by the locking pieces 14 from the outside, the appearance of the lens cap itself can be improved.

7 to 10 exemplify various modifications of the shape of the engaging portion of the sliding body which is the engaging member in the lens cap. Similar to FIG. 6 described above, FIGS. 7 to 10 are enlarged views of main parts when the lens cap is attached to the front end of the lens barrel of a camera or the like, as viewed from the back side of the lens cap. In addition, the engaging portion between the sliding body of the lens cap and the inner circumference of the front end portion of the lens barrel is shown.

First, FIG. 7 shows the locking portion 1 of the lens cap.
The case where the shape of 6a is an arc shape having a diameter (R2a) larger than the diameter (R2) of the engaging groove 19 is illustrated. As a result, the engaging portion 16a and the engaging groove 19 are engaged with each other at two points, that is, the point 23aa at one end and the point 23ab at the other end on the engaging portion 16a.

Next, FIG. 8 shows the locking portion 1 of the lens cap.
The shape of 6b is a mountain shape formed by two straight lines. As a result, the engaging portion 16b and the engaging groove 19 are engaged with each other at the mountain-shaped apex 23b formed by the two straight lines forming the engaging portion 16b.

Further, in FIG. 9, the shape of the locking portion 16c of the lens cap is a horizontal shape consisting of one straight line. As a result, the engaging portion 16c and the engaging groove 19 are engaged at two points 23ca and 23cb on both ends of the straight line forming the engaging portion 16c.

Further, in FIG. 10, the shape of the locking portion 16d of the lens cap is a valley shape consisting of two straight lines. As a result, the apex 23da and the apex 2 at both ends of the valley shape formed by the two straight lines forming the locking portion 16d are formed.
The locking portion 16d and the engaging groove 19 are engaged with each other at two points of 3 db.

On the other hand, FIG. 11 shows various modified examples of the sectional shape of the engaging groove of the engaging portion of the sliding body which is the engaging member of the lens cap and the sectional shape of the engaging groove of the lens barrel. Is illustrated.

That is, FIGS. 11 (a), 11 (b), and 11 (c) illustrate the sectional shapes of the engaging grooves 19, 19b, and 19c of the lens barrel, respectively, and FIGS. )
(F) is a locking portion 16 of the sliding body of the lens cap,
The cross-sectional shapes of the locking grooves 16e and 16f are respectively illustrated.

First, in FIG. 11A, similar to the one described in the above-mentioned embodiment (see FIGS. 3 to 5), the cross-sectional shape of the engagement groove 19 at the inner circumference of the front end of the lens barrel is a straight line. It has a valley-shaped groove shape.

In FIG. 11B, the cross-sectional shape of the engagement groove 19 on the inner circumference of the front end of the lens barrel is a rectangular shape formed by a straight line.

FIG. 11 (c) shows that the engaging groove 19 on the inner circumference of the front end of the lens barrel has an arcuate groove shape in which the cross-sectional shape is formed by a straight line and a curved line.

Further, in FIG. 11 (d), like the one described in the above-mentioned embodiment (see FIGS. 3 to 5), the sectional shape of the engaging groove of the engaging portion 16 is formed by a straight line. It has a mountain shape.

In FIG. 11 (e), the locking groove of the locking portion 16e has a rectangular cross section formed by a straight line.

In FIG. 11 (f), the cross-sectional shape of the locking groove of the locking portion 16f is an arc shape formed by straight lines and curved lines.

The engagement groove of the engagement portion of the lens cap and the engagement groove of the inner circumference of the front end portion of the lens barrel, which are exemplified by FIGS. 11 (a) to 11 (f), can be respectively combined. Depending on the combination of the above, due to a processing error of the engaging portion of the sliding body as described above, the engaging groove of the engaging portion of the lens cap engages with the engaging groove of the inner circumference of the front end of the lens barrel. In this case, the engagement depth of the engagement portion may be affected.

That is, in FIG. 11, the combination of the engaging groove 19 shown in (a) and the engaging portion 16e shown in (e), the engaging groove 19 shown in (a) and the engaging portion shown in (f) are shown. Part 16
Combination with f, engagement groove 19b and (d) shown in (b)
The engagement groove 16b shown in (b) and the engagement portion 16f shown in (f),
A combination of the engagement groove 19c shown in (c) and the locking portion 16 shown in (d), a combination of the engagement groove 19c shown in (c) and the locking portion 16e shown in (e), and (c). Engagement groove 1 shown
In the case of the combination of 9c and the locking portion 16f shown in (f), the same effect as in the above-described embodiment can be obtained.

However, in the combination of the engaging groove 19b shown in FIG. 11B and the engaging portion 16e shown in FIG. 11E, the engaging portion 16e shown by the arrow 2 in FIG.
A processing error in one direction may affect whether or not the engaging portion 16e engages with the engaging groove 19b, but does not affect the engaging depth of the engaging portion. . Therefore, the engaging groove 19b shown in FIG.
Then, only in the case of the combination with the locking portion 16e shown in FIG. 11 (e), the effect of the above-described embodiment cannot be obtained.

On the other hand, FIG. 12 exemplifies various modifications of the shape of the engaging groove provided on the inner circumference of the front end of the lens barrel.

FIG. 12 (a) shows a screw groove 19a, which is an engaging groove, provided on the inner circumference of the front end portion of the lens barrel 18a, and is similar to that described in the above-mentioned embodiment. It is a thing.

In FIG. 12B, an engaging portion which is an engaging groove formed of a concave groove is provided over the entire inner circumference of the front end portion of the lens barrel 18b.

In FIG. 12C, a pair of arcuate groove portions are provided on the inner circumference of the front end portion of the lens barrel 18c.

That is, in the engagement groove provided in the front end portion of the lens barrel, as described above, for example, a thread groove for screwing a filter or the like is generally provided (FIG. 12 (a)). However, FIG. 12 (b)
As shown in (c), if an engaging portion having a shape capable of engaging with the locking portion of the lens cap is provided,
It is possible to obtain the same effect as that of the above-described embodiment.

[Additional Notes] (1) In a lens cap to be mounted using the engaging portion on the inner circumference of the front end of the lens barrel, the lens cap body is slid so as to project outward from the center of the lens cap body. A pressing portion that is movably disposed and that projects and operates outside the peripheral portion of the lens cap body, and a locking portion that is configured to partially abut the engaging portion on the inner circumference of the lens front end portion. And an elastic member that urges the engaging member to project outward.

(2) In the lens cap mounted by utilizing the engaging portion of the inner circumference of the front end of the lens barrel, the lens cap is disposed so as to be slidable outward from the center of the lens cap body. An engaging member that is provided and that is manually operated; and an engaging member that has a locking portion that is configured to partially contact the engaging portion on the inner circumference of the lens barrel front end portion; An elastic member that urges in the outward direction,
Lens cap equipped with.

(3) In the lens cap described in Supplementary Note 1 or Supplementary Note 2, the engaging portion of the inner circumference of the front end of the lens barrel is an arcuate groove, and the engaging portion of the engaging member is
A lens cap configured to engage with an arcuate groove of an engaging portion on the inner circumference of the front end of the lens barrel at a point near the center on the width of the engaging portion.

(4) In the lens cap described in Supplementary Note 1 or Supplementary Note 2, the engaging portion at the inner circumference of the front end of the lens barrel is an arcuate groove, and the engaging portion of the engaging member is
A lens cap configured to engage with the arcuate groove of the engaging portion on the inner circumference of the front end of the lens barrel at two points substantially at both ends of the locking portion.

(5) In the lens cap mounted by utilizing the engaging portion on the inner circumference of the front end of the lens barrel, the lens cap is arranged so as to be slidable from the center of the lens cap body to the outside. An engaging member provided, an elastic member for urging the engaging member to project outward, and a recess provided on the engaging member and provided around the entire inner peripheral portion of the lens barrel front end portion. A locking portion configured to partially abut circumferentially with respect to the engaging portion formed of a groove, and a pressing portion that is provided integrally with the engaging member and that operates the engaging member. A lens cap to do.

(6) In a lens cap to be mounted by utilizing the engagement portion on the inner circumference of the front end of the lens barrel, the lens cap is arranged so as to be slidable outward from the center of the lens cap body. An engaging member provided, an elastic member for urging the engaging member in the outward direction, and an engaging member provided in an arc shape on a part of the inner peripheral portion of the front end of the lens barrel. A locking portion configured so as to partially abut circumferentially with respect to the engaging portion formed of the concave groove, and a pressing portion that is integrally provided to the engaging member and that operates the engaging member. Lens cap to be equipped.

[0071]

As described above, according to the present invention, the shape of the engaging portion of the engaging member of the lens cap is the arc of the diameter (R) of the engaging groove provided on the inner circumference of the front end of the lens barrel. By making the shape different from the shape, when the engaging portion of the engaging member and the engaging groove of the inner circumference of the front end of the lens barrel are engaged, the contact point is clarified, and the engaging member is formed. By reducing the contact surface between the engaging portion and the engaging groove, the engaging portion between the engaging portion and the engaging groove is engaged deeper to prevent backlash, and the lens cap is attached to the lens mirror. It is possible to provide a lens cap that can be reliably attached to the front end of a cylinder.

Further, it is not necessary to change the shape of the engaging portion of the engaging member of the lens cap according to the type of the diameter (R) of the engaging groove on the inner circumference of the front end of the lens barrel, and various kinds of inner diameters different from each other can be used. It is possible to provide a lens cap that can use a common engaging member for the lens barrel.

[Brief description of drawings]

FIG. 1 is an external perspective view schematically showing a lens cap according to an embodiment of the present invention, showing a state in which one of the engaging members is disassembled when viewed from the back side of the lens cap. .

FIG. 2 shows the lens cap of FIG.
FIG. 6 is a vertical cross-sectional view when cut along a line along a Q line.

FIG. 3 is a longitudinal cross-sectional view of essential parts showing a state in which the lens cap of FIG. 1 is attached to a front end portion of a lens barrel of a camera or the like.

FIG. 4 shows the OQ of FIG. 1 in the state shown in FIG.
The expanded longitudinal cross-sectional view at the time of cutting along the line along the line.

5 is the OR of FIG. 1 in the state shown in FIG.
The expanded longitudinal cross-sectional view at the time of cutting along the line along the line.

FIG. 6 is an enlarged view of the lens cap as viewed from the back side in the state shown in FIG. 3, showing the engagement portion between the sliding body of the lens cap and the inner circumference of the front end of the lens barrel.

FIG. 7 is a diagram illustrating a modification of the shape of the engagement member of the lens cap according to the embodiment of the invention.

FIG. 8 is a diagram illustrating a modification of the shape of the engagement member of the lens cap according to the embodiment of the invention.

FIG. 9 is a diagram illustrating a modification of the shape of the engaging member of the lens cap according to the embodiment of the invention.

FIG. 10 is a diagram illustrating a modification of the shape of the engaging member of the lens cap according to the embodiment of the invention.

FIG. 11 is a view exemplifying a modification of the cross-sectional shapes of the engaging groove of the engaging member of the lens cap and the engaging groove of the lens barrel of the embodiment of the present invention.

FIG. 12 is a view exemplifying a modification of the shape of the engagement groove on the inner circumference of the front end of the lens barrel according to the embodiment of the present invention.

FIG. 13 is a perspective view of a main part illustrating a conventional engagement groove on the inner circumference of the front end of the lens barrel.

FIG. 14 is an external perspective view of a conventional lens cap.

FIG. 15 shows the lens cap of FIG.
4 is a longitudinal cross-sectional view of a main part when cut along a line AA of FIG.

16 is a longitudinal cross-sectional view of a main part showing a state when the lens cap of FIG. 14 is attached to the front end of the lens barrel.

17 is a view showing the OQ2 line or OR of FIG. 14 in the state shown in FIG. 16 when the locking portion of the engagement member of the lens cap of FIG. 14 is ideally processed.
The principal part longitudinal cross-sectional view at the time of cutting in the line along 2 lines.

FIG. 18 is a view showing an example in which an error occurs during processing of the engaging portion of the engaging member of the lens cap of FIG. 14, and is a line along the line OQ2 of FIG. 14 in the state shown in FIG. 16; The principal part longitudinal cross-sectional view at the time of cutting.

19 is an exemplification in the case where an error occurs during processing of the engaging portion of the engaging member of the lens cap of FIG. 14, and is a line along the OR2 line of FIG. 14 in the state shown in FIG. 16; The principal part longitudinal cross-sectional view at the time of cutting.

[Explanation of symbols]

 1 ... Lens cap body 11 ... Sliding body (engaging member) 12 ... Pressing part 16 ... Locking part 17 ... Elastic member 18 ... Lens barrel 19 ... Engagement groove

Claims (3)

[Claims] 1. A lens cap mounted by utilizing an engagement portion on an inner circumference of a front end portion of a lens barrel, the lens cap body being provided so as to be slidable outward from a center direction of the lens cap body. An engaging member, an elastic member that biases the engaging member in the outward direction, and an elastic member that is provided on the engaging member and partially abuts on an engaging portion on the inner circumference of the lens front end portion. And a pressing portion that is provided integrally with the engagement member and that operates the engagement member. 2. The locking portion has an arc shape, and has a size different from that of the engaging portion of the inner circumference of the front end of the lens barrel with which the locking portion engages. The lens cap according to claim 1. 3. A lens cap mounted by utilizing an engaging portion formed of a thread groove on the inner circumference of the front end of the lens barrel, wherein the lens cap body is slidable outward from the center of the lens cap body. And an engaging member having a pressing portion that is manually operated and a locking portion that partially abuts the arc-shaped portion of the engaging portion formed by the thread groove on the inner circumference of the front end of the lens barrel. And an elastic member that biases the engaging member in the outward direction.