JPH0730911U - compact - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a compact in which the hands are not soiled by the cosmetic material in the makeup plate when the makeup plate is stored in the makeup plate storage recess of the container body. [Structure] A container body 1 having a makeup dish storage recess 1a formed on an upper surface, and a makeup dish 3 stored in the makeup dish storage recess 1a are provided. Then, the temporary lids 6 and 20 for appropriately selecting and covering the upper surface of the decorative plate 3 are provided, and the temporary lids 6 and 2 are provided.
In 0, the elastic body portion 18 is formed on an arbitrary side portion, and the mounting portions 15 with the convex portions 16 are formed on both ends of the side portion. In addition, the concave portions 12a to 1 which are detachably engaged with the convex portion 16
2d is formed, and a convex portion 9 which is detachably engaged with the concave portions 12a to 12d is formed on the peripheral side wall of the decorative dish containing concave portion 1a of the container body 1 corresponding to the concave portions 12a to 12d of the decorative dish 3. .

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a compact in which the cosmetic material in the decorative plate is not touched by the hands when the decorative plate is housed in the recess formed in the container body.

[0002]

[Prior art]

 Generally, as shown in FIG. 21, a cosmetic compact includes a container main body 31 having two recesses 31a and 31b formed on the front and back thereof, and a lid 32 for covering the upper surface of the container main body 31. In other words, the decorative plate 33 filled with the cosmetic material 33a is housed in the rear recess 31a, and the puff 34 is housed in the front recess 31b. After the cosmetic 33a is used up, it is used repeatedly by replacing it with a refill cosmetic. Such a refill cosmetic is contained in a refill container as shown in FIG. 22, for example. As shown in the figure, this refill container is configured by hinge-connecting a container body 40 and a lid body 41 at a rear portion thereof. Inside the container body 40, a makeup plate 33 filled with the cosmetic material 33a is provided. It is housed. The decorative plate 33 is temporarily fixed to the inner bottom surface of the container body 40 via an adhesive layer 42 provided on the bottom surface thereof. When removing the decorative plate 33 from this refill container and setting it compactly, first open the lid 41, and then insert a thin rod into the through hole 43 opened in the bottom of the container body 40 to attach it to the bottom of the container body 40. After the makeup plate 33 that is temporarily fixed is pushed up, the makeup plate 33 is removed from the container body 40, and then the makeup plate 33 without the lid is moved by hand to form a compact body. The upper side of the concave portion 31a on the side is positioned, and the outer peripheral portion of the cosmetic plate 33 is pressed by hand and pushed into the concave portion 31a on the rear side.

[0003]

[Problems to be solved by the device]

 However, in the above compact, when the makeup plate 33a is used up and the makeup plate 33 is replaced with a new makeup plate 33 (where the makeup product 33a is filled), hold the makeup plate 33 without the lid. When it is moved by hand or when it is pushed into the recess 31a on the rear side while pressing the outer peripheral portion of the cosmetic plate 33 and the like, the surface of the cosmetic material 33a is accidentally pressed by the hand and the surface of the cosmetic material 33a is touched. However, there is a problem that marks are left on the hand and the hand is soiled with the cosmetic 33a. Moreover, when the makeup plate 33 is to be compactly housed, first the lid 41 of the refill container is opened, and then a thin rod is inserted into the through hole 43 of the container body 40 and the makeup plate 33 is pushed up to raise the container body 40. Since it is necessary to remove the decorative plate 33 from the above, there is also a problem that the work of accommodating the compact is complicated. Further, the compact is put upright in a handbag or the like when it is carried, but when vibration is applied to the handbag or the like at this time, the vibration is transmitted from the side of the compact (from the side wall direction of the container body 31). It is transmitted to the decorative plate 33 fixed to the bottom surface of the recess 31a on the rear side via the adhesive 42, and acts as a lateral shake on the decorative plate 33. Therefore, there is also a problem that the decorative plate 33 is peeled off from the adhesive layer 42 and separated.

The present invention has been made in view of such circumstances, and when the makeup plate is housed in the concave portion formed in the container body, the cosmetics in the makeup plate become dirty to the hands, vibrations when carrying, etc. It is an object of the present invention to provide a compact in which the decorative plate does not come off from the recessed portion even if the pressure is applied and the decorative plate can be easily accommodated.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, the compact of the present invention comprises a compact container body having a makeup plate receiving recess formed on the upper surface thereof, and a makeup plate housed in the makeup plate receiving recess of the container body. A plurality of temporary lids for appropriately selecting and covering the upper surface of the temporary lid are provided, and each temporary lid has a mounting portion formed on an arbitrary side edge, and a first engaging portion is formed inside the mounting portion. , An engaged portion that is detachably engaged with the first engaging portion is formed on a portion of the outer peripheral surface of the decorative plate corresponding to the first engaging portion, and any of the temporary lids is attached. At the side edge, an elastic body part is formed that contacts the side part of the decorative plate at the time of the above-mentioned engagement and presses the temporary cover by the elastic force of itself when closing the lid, and the engaged part of the decorative plate is engaged. And a second engaging portion that detachably engages with the engaged portion is formed on the peripheral wall surface of the makeup dish accommodating concave portion of the container body corresponding to the portion. Take a cormorant configuration.

[0006]

[Action]

 That is, in the compact of the present invention, when the makeup plate is to be accommodated in the makeup dish storage recess of the container body, first, the makeup dish with the temporary lid is moved to the upper side of the makeup dish storage recess and positioned. In that state, the decorative plate is lowered and pushed into the decorative plate accommodating recess. As a result, the attachment portion of the temporary lid is elastically deformed to release the engagement between the first engagement portion formed on the attachment portion and the engaged portion formed on the outer peripheral surface of the decorative plate, and The engaged portion engages with the second engaging portion formed on the peripheral wall surface of the makeup dish storage recess, and the makeup dish is fixed in the makeup dish storage recess. In this way, with the temporary lid attached to the makeup tray, this makeup tray can be moved or pushed into the makeup dish storage recess, so that the cosmetics inside the makeup tray can be manually pressed as in the conventional example. There is no problem that the surface of the product is pressed and marks on the surface of the cosmetics and the hands are stained with the cosmetics. Moreover, in order to store the makeup plate in the makeup dish storage recess, it is sufficient to push the makeup dish into the makeup dish storage recess with the temporary lid attached, which simplifies the storage operation. . Further, since the decorative plate is attached using the peripheral wall of the concave part for storing the decorative plate, the peripheral wall of the concave part for storing the decorative plate acts as a steady rest even when vibration is applied when carrying the device. The decorative plate will not come off from the concave part for receiving the decorative plate.

On the other hand, when assembling a temporary lid on the decorative plate, first, one is appropriately selected from a plurality of temporary lids. Next, this properly selected temporary lid is set upright and placed on one side of the decorative plate corresponding to the desired side edge of the temporary lid, and then formed on any side edge of the temporary lid. The first engaging portion of the temporary lid is engaged with the engaged portion of the decorative plate by aligning the first engaging portion with the engaged portion of the decorative plate corresponding to the first engaging portion. To do. In this engaged state, the elastic body portion provided on the temporary lid is in contact with the side portion of the decorative plate. After that, the temporary lid is slightly rotated toward the decorative plate. As a result, the temporary lid automatically falls to the side of the decorative plate and the lid is closed. After the lid is closed, the elastic force of the elastic body portion acts in the opposite direction to the force for opening the temporary lid, so that the closed state is maintained. The procedure of such assembling is the same regardless of which of the plurality of temporary lids is selected. In this way, at the time of the above-mentioned assembly, after the temporary lid is rotatably connected to the decorative dish, the temporary lid can be automatically closed by slightly rotating it to the decorative dish side. It doesn't take. In addition, since there are multiple types of attachments of the temporary lid to one makeup dish, the makeup dish can be used for various refill containers (for example, a temporary lid can be attached to the longitudinal end of the makeup dish to open and close in the longitudinal direction). Common type of parts such as vertical type, horizontal type refill container with a temporary lid attached to the end in the direction orthogonal to the longitudinal direction, which can be opened and closed in the orthogonal direction) Can be realized. However, since the temporary lid is attached to the decorative plate, the thickness is reduced by about the thickness of the container body that houses the decorative plate, resulting in a compact size.

Next, this invention will be described in detail based on embodiments.

[0009]

【Example】

 FIG. 1 shows an embodiment of this invention. In the figure, reference numeral 1 denotes a container main body, on the upper surface of which a makeup dish accommodating recess 1a is formed on the rear side and a puff accommodating recess 1b on the front side. 2 is a lid. Reference numeral 3 denotes a synthetic resin decorative dish which is formed in a rectangular shape in plan view and is accommodated in the decorative dish accommodating concave section 1a. As shown in FIG. 2, a concave section 3a is formed on the upper surface of the decorative dish 3a. Is housed. When the decorative plate 3 is sold as a refill, the upper surface of the decorative plate 3 is covered with a temporary lid 6 made of synthetic resin. The temporary lid 6 is attached to the front end portion or the rear end portion of the decorative plate 3 (in FIG. 2, the temporary lid 6 is attached to the front end portion of the decorative plate 3). Then, when replacing the old makeup plate 3 with the new makeup plate 3, after removing the old makeup plate 3 from the makeup plate accommodating recess 1a of the container body 1, the makeup plate 3 covered with the temporary lid 6 is removed. Position it on the upper side of the makeup plate accommodating recess 1a and lower it as it is, remove the temporary lid 6 from the new makeup plate 3 and fix and store the new makeup plate 3 in the makeup dish accommodating recess 1a. ing. In the figure, 5 is a puff.

More specifically, as shown in FIGS. 3 and 4, the decorative plate accommodating recess 1 a of the container body 1 is provided with a recess 7 at the front end portions of the left and right side surfaces in a relatively facing state. As shown in FIGS. 5 and 6, an elastic plate 8 that can be slightly bent outward is provided upright on the bottom surfaces of the both recesses 7. A convex portion 9 is formed on the upper end portion of each of the elastic plates 8 so as to protrude into the decorative plate accommodating concave portion 1a. Further, as shown in FIG. 7, the decorative plate accommodating recessed portion 1a is provided with a ridge 10 having a quadrangular cross section, the upper surface of which is formed as a downward inclined surface, at the center of the rear side surface thereof. The side wall (partition wall that divides the makeup dish storage recess 1a and the puff storage recess 1b) 11 has a notch in the center, and the notch 11a serves as a finger insertion space when the makeup dish 3 is removed. There is. In FIG. 3, reference numeral 18 denotes a push button rotatably attached to a recessed portion of the front end portion of the container body 1, the engaging projection 1 c formed on the inner surface of the recessed portion of the container body 1 and the lid body 2. The engagement with the engaged ridge (invisible and hidden) formed on the front end of the is released. Further, in FIG. 4, reference numeral 1d denotes bearing holes formed so as to face each other on both left and right sides of the concave portion of the rear end portion of the container body 1, and the hinge shaft provided at the rear end portion of the lid body 2 (Not visible) is pivotally engaged.

As shown in FIG. 8, the decorative plate 3 is attached to and detached from the convex portions 9 of the elastic plate 8 of the container body 1 at the front and rear end portions of the left and right side surfaces and the left and right portions of the front and rear both side surfaces. A pair of recesses 12a, 12b, 12c, 12d which are freely engaged are formed. Further, in the above-mentioned cosmetic plate 3, as shown in FIGS. 9 and 10, in the central portions of the left and right side surfaces and the front and rear side surfaces, notch portions 19a cut out downward from the upper edge of each side surface. , 19b, 19c, 19d are formed, and each of the notches 19a to 19d is formed with one protrusion 20a, 20b, 20c, 20d, and each of the notches 19a to 19d is formed. On the lower side, concave portions 13a, 13b, 13c, 13d which are detachably engaged with the protrusions 10 on the rear side of the decorative plate accommodating concave portion 1a are formed longer than the width of the cutout portions 19a to 19d. There is.

The decorative plate 3 is covered with a temporary cover 6 when it is sold for refilling. As shown in FIG. 11, the corners of the ceiling wall 6a of the temporary lid 6 are formed in a rectangular shape having a large roundness. As shown in FIGS. A vertical wall 14 hangs from the lower surface of the portion and the rear side portion subsequent thereto. A pair of left and right mounting portions 15 hang down from the lower surfaces of the rear half portions of the left and right side portions of the vertical wall 14, and a pair of left and right convex portions 16 relatively project from the inner surfaces of the lower front ends of these both mounting portions 15. It is formed to project. Further, the upper ends of the both mounting portions 15 are cut out from the front end edge toward the rear by a predetermined distance, and the notch portion 17 forms the front end portion of the ceiling wall 6a in the elastic body portion 18. There is. Further, an engagement piece 21 hangs down from the center of the rear side portion of the vertical wall 14, and the inner surface of the engagement piece 21 is detachable from the protrusions 20a to 20d formed on the respective side surfaces of the decorative plate 3. A ridge 22 that engages with the.

In the case where the temporary lid 6 is attached to the makeup plate 3 for refilling with such a configuration, first, as shown in FIG. 14, the temporary lid 6 is placed in a vertical posture in front of the makeup plate 3. The convex portions 16 provided on both attachment portions 15 of the temporary lid 6 are aligned with the front concave portions 12a on the left and right side surfaces provided on the decorative plate 3. Then, the temporary lid 6 is moved to the side of the decorative plate 3, the both mounting portions 15 of the temporary lid 6 are brought into contact with the front edges of the left and right side surfaces of the decorative plate 3, and the both mounting portions 15 of the temporary lid 6 are placed outside. It is pushed toward the decorative plate 3 side while being elastically deformed to engage the projections 16 of both mounting portions 15 of the temporary cover 6 with the front recesses 12a of the decorative plate 3 (in this state, as shown in FIG. The elastic part 18 of 6 contacts the front side of the decorative plate 3 in a slightly warped state. Next, when the temporary lid 6 is rotated rearward, the temporary lid 6 is slightly rotated and then vigorously falls backward by the elastic force generated by the bending back of the elastic body portion 18 and is automatically lidded. In this closed state, the elastic force of the elastic body portion 18 of the temporary lid 6 acts in the opposite direction to the force for opening the temporary lid 6, so that the closed state is maintained. After the lid is closed, the temporary lid 6 is held by hand and is rotated upward against the elastic force of the elastic body portion 18 of the temporary lid 6 to be in a vertical posture. The elastic force of and the mounting portions 15 interact with each other, and the vertical posture is maintained (see FIG. 15). In addition, when the temporary lid 6 is attached to the rear end portion of the decorative plate 3, the temporary cover 6 is arranged in the vertical position behind the decorative plate 3 and provided on both mounting portions 15 of the temporary cover 6. The convex portions 16 are aligned with the rear concave portions 12b on the left and right side surfaces provided on the decorative plate 3, and then attached in the same manner as above.

A temporary lid 20 shown in FIG. 16 can be attached to the right end portion and the left end portion of the decorative plate 3. This temporary lid 20 is different from the temporary lid 6 in that the right and left sides of the temporary lid 20 are notched. The other parts are the same as those of the temporary lid 6, and the same parts are denoted by the same reference numerals. When such a temporary lid 20 is attached to the right end portion of the decorative plate 3, the temporary lid 20 is arranged on the right side of the decorative plate 3 in a vertical posture and provided on both mounting portions 15 of the temporary lid 20. The convex portion 16 is aligned with the right side concave portions 12c on both front and rear surfaces provided on the decorative plate 3, and then attached in the same manner as described above. Further, when the temporary lid 20 is attached to the left end portion of the decorative plate 3, the temporary lid 20 is arranged in the upright position on the left side of the decorative plate 3 and provided on both mounting portions 15 of the temporary lid 20. The convex portions 16 are aligned with the left concave portions 12d on the front and rear side surfaces provided on the decorative plate 3, and then attached in the same manner as above.

When the makeup tray 3 shown in FIG. 2 is to be stored in the makeup tray storage recess 1 a of the container body 1, first, as shown in FIG. 17, the makeup tray 3 covered by the temporary lid 6 is placed in the container. The main body 1 is positioned above the decorative dish housing recess 1a. Then, the decorative plate 3 is lowered and placed in the decorative plate housing recess 1a. In this state, as shown in FIG. 18, the lower end surface of the vertical wall 14 of the temporary lid 6 is placed on the left and right side walls of the container body 1. Next, as shown in FIG. 19, the rear end portion of the decorative plate 3 is inclined downward, and the rear side concave portion 13 provided on the rear side surface of the decorative plate 3 is provided on the rear side surface of the decorative plate accommodating concave portion 1a. The front end portion of the decorative plate 3 is pressed downward while being engaged with the protruding strip 10. As a result, the front surface of the decorative plate 3 descends along the side surface of the front side wall 11 of the decorative plate accommodating recess 1a (that is, the front side surface 11b of the decorative plate accommodating recess 1a), and along with this descending, the temporary lid 6 is removed. Both mounting portions 15 are bent upward, and the engagement between the concave portion 12 of the decorative plate 3 and the convex portion 17 of the elastic piece portion 15 is released. Furthermore, when the decorative plate 3 is pressed downward, the front recess 12a of the decorative plate 3 engages with the ridges 9 of the elastic plates 8 provided on the left and right side surfaces of the decorative plate accommodating recess 1a (see FIG. 20). ). On the other hand, when taking out the makeup plate 3 from the makeup plate storage recess 1a, the index finger, thumb, etc. are inserted from the notch 11a of the front side wall 11 of the makeup plate storage recess 1a and the front face of the makeup plate 3 is lifted. As a result, the engagement between the front recess 12a of the decorative plate 3 and the protrusion 9 of the elastic plate 8 and the engagement of the rear recess 13d of the decorative plate 3 with the protrusion 10 of the cosmetic plate accommodating recess 1a are released. , The makeup tray 3 is lifted up. The decorative plate 3 having the temporary lid 6 attached to the rear end and the decorative plate 3 having the temporary lid 20 attached to one of the left and right ends are also similar to the above. It is accommodated in the accommodating recess 1a and is taken out from the makeup dish accommodating recess 1a.

As described above, the compact is configured such that, when the makeup tray 3 is replaced, the makeup tray 3 is moved with the makeup lid 3 covered with the temporary lids 6 and 6, or the makeup tray of the container body 1 is moved. Since it can be pushed into the accommodating recess 1a, the surface of the cosmetic 4 is not scratched by the replacement and the hand is not soiled with the cosmetic 4. In addition, in order to attach the makeup plate 3 to the makeup plate accommodating recess 1a, it is sufficient to push the makeup plate 3 into the cosmetics accommodating recess 1a as described above, and the operation is simple. Further, since the convex plate 9 formed on the elastic plates 8 on both the left and right side surfaces of the decorative plate accommodating concave portion 1a and the protrusion 10 formed on the rear side surface of the decorative plate accommodating concave portion 1a are used to attach the decorative plate 3, Even if a force is applied to move the compact in the left-right direction and the front-back direction due to vibration when carrying it, both the left and right side surfaces and the rear side surface of the above-mentioned makeup plate accommodating recessed portion 1a have a steadying action against lateral shake, and a makeup plate. 3 does not disengage from the decorative dish storage recess 1a.

Moreover, when the temporary lids 6 and 20 are assembled to the decorative plate 3, the temporary cover 6 is placed in a vertical posture and rotatably attached to the rear end portion of the decorative plate 3, and then the temporary cover 6 is placed. The work can be done easily because it can be closed automatically by rotating it to the 3 side a little. In addition, by using the two types of temporary lids 6 and 20, the decorative plate 3 can be commonly used for a vertical type or a horizontal type refill container. Further, since the temporary lid 6 is directly attached to the decorative plate 3, the entire refill container becomes compact. In addition, when the temporary lid 6 is rotated upward to a vertical posture after the lid is closed, this vertical posture can be maintained. Therefore, the temporary lid 6 is opened and the cosmetics in the makeup tray 3 is opened. It is not necessary to hold the temporary lid 6 by hand when directly looking at, and this work is not bothersome.

In the above embodiment, both elastic piece portions 15 of the temporary lid 6 are placed on the left and right side walls of the container body 1 when they are placed in the makeup dish accommodating concave portion 1 a of the container body 1. However, the present invention is not limited to this, and the temporary lid 6 may be housed in the makeup dish housing recess 1a. In this case, the elastic plate 8 is erected in the makeup dish accommodating recess 1a.

[0019]

[Effect of device]

 As described above, according to the compact device of the present invention, it is possible to move the makeup tray or push it into the makeup dish accommodating recess with the temporary lid attached to the makeup tray. As described above, the problem that the surface of the cosmetic material in the decorative dish is pressed with a hand and the surface of the cosmetic material is marked by a hand or the hand is soiled with the cosmetic material is eliminated. Moreover, in order to store the makeup plate in the makeup dish storage recess, it is sufficient to push the makeup dish into the makeup dish storage recess with the temporary lid still attached, which simplifies the storing operation. . Further, since the makeup plate is attached using the peripheral wall surface of the makeup plate accommodating recess, the peripheral wall of the makeup plate accommodating recess functions to prevent the shake of the makeup plate even when vibration is applied while carrying it. The plate will not come off from the makeup plate storage recess. In addition, when the temporary lid is assembled to the decorative plate, the temporary cover can be rotatably connected to the decorative plate, and then the temporary cover can be automatically closed by slightly rotating it toward the decorative plate. It does not take time to work. In addition, since there are a plurality of types of attachment of the temporary lid to one makeup tray, the makeup tray is attached to various refill containers (for example, a temporary lid is attached to the longitudinal end of the makeup tray so that the makeup tray can be opened and closed in the longitudinal direction). Common parts such as vertical type and horizontal type refill container that can be opened and closed in the orthogonal direction by attaching a temporary lid to the end in the direction orthogonal to the longitudinal direction. Can be achieved. In addition, since the temporary lid is attached to the decorative plate, the container body for accommodating the decorative plate is reduced in thickness by about the thickness of the container body, thus making the device compact.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a perspective view showing a decorative plate and a temporary lid.

FIG. 3 is a perspective view showing a container body.

FIG. 4 is a plan view of a main part of the container body.

FIG. 5 is a perspective view of a main part of the container body.

FIG. 6 is a cross-sectional view showing a convex portion of a makeup dish accommodating concave portion.

FIG. 7 is a cross-sectional view showing a ridge of the decorative dish storage recess.

FIG. 8 is a plan view of a makeup plate.

FIG. 9 is a front view of the decorative plate.

FIG. 10 is a cross-sectional view of the decorative dish.

FIG. 11 is a view of the temporary lid as viewed from below.

FIG. 12 is a view of the temporary lid as viewed from behind.

FIG. 13 is a side view of the temporary lid.

FIG. 14 is an explanatory view showing the operation of the present invention.

FIG. 15 is an explanatory view showing the operation of the present invention.

FIG. 16 is a perspective view showing a state in which a temporary lid different from the temporary lid is attached to the decorative plate.

FIG. 17 is a sectional view showing the operation of the present invention.

FIG. 18 is a plan view showing the operation of the present invention.

FIG. 19 is a sectional view showing the operation of the present invention.

FIG. 20 is a sectional view showing the operation of the present invention.

FIG. 21 is a perspective view showing a conventional example.

FIG. 22 is a cross-sectional view showing a conventional refill container.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Container main body 1a Decorative dish accommodating recessed part 2 Lid body 3 Decorative plate 4 Cosmetics 5 Puff 6,20 Temporary lid 9 Convex part 10 Protrusions 12a, 12b, 12c, 12d Recessed part 15 Mounting part 16 Convex part 18 Elastic body part

Claims (1)

[Scope of utility model registration request] 1. A compact container body (1) having a makeup dish storage recess (1a) formed on an upper surface thereof, and a makeup dish (3) housed in the makeup dish storage recess (1a) of the container body (1).
A plurality of temporary lids 6 and 20 for appropriately selecting and covering the upper surface of each of the temporary lids 6 and 20 are provided. The engaging portion 16 which forms the engaging portion 16 and which is detachably engaged with the first engaging portion 16 at a portion of the outer peripheral surface of the decorative plate 3 corresponding to the first engaging portion 16. 12 is formed and contacts the side edge of the decorative tray 3 at an arbitrary side edge of each of the temporary lids 6 and 20 at the time of the above engagement, and when the lid is closed, the temporary lids 6 and 20 are attached by the elastic force of themselves. An elastic body portion 18 that presses to the 3 side is formed, and the makeup dish accommodating recess portion 1 of the container body 1 corresponding to the engaged portion 12 of the makeup dish 3 is formed.
A compact featured in that a second engaging portion 9 which is detachably engaged with the engaged portion 12 is formed on the peripheral wall surface of a.