KR101968477B1 - Orthodotic abrasive system - Google Patents

Abstract

Disclosed is a polishing system for orthodontics, which includes: a strip provided to polish a predetermined portion on a tooth surface to secure a space between teeth during a dental treatment; and a handpiece coupled to the strip. According to the present invention, the polishing system for orthodontics comprises: a strip provided to polish a predetermined portion on a tooth surface; and a dental handpiece provided to convert first power for rotational motion to second power for translational power, to transfer the second power to the coupled strip, and to enable the strip to perform polishing, wherein the strip comprises: a cylindrical coupling portion coupled to the handpiece and provided to receive the second power from the handpiece; a fixing portion extending in a predetermined distance from the coupling portion and having a part which is cut in a longitudinal direction to form a first contact surface; and a polishing blade having a second contact surface formed on an upper end and a polishing surface for polishing formed on a lower end. The strip enables all of longitudinal axes of the polishing blade to be fixated while the first contact surface closely adheres to the second contact surface such that it is possible to prevent a shape of the polishing blade from being deformed, such as being bent, thereby being capable of precisely performing a polishing operation and enhancing safety during the polishing operation. In addition, the rotational motion is converted into the translational motion within the handpiece, thereby enhancing efficiency of conversion.

Description

[0001] The present invention relates to an orthodontic abrasive system,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polishing system for orthodontic treatment, and more particularly, to a polishing system for orthodontic treatment which includes a strip for polishing a predetermined portion of a tooth surface in order to secure a space between teeth during a dental procedure, To a polishing system.

Generally, in order to secure space between teeth during orthodontic treatment in the dentist, the tooth surface is changed.

In this case, the orthodontic strip is mainly used by being coupled to a handpiece capable of translational motion. In the conventional orthodontic strip, the both ends of the abrading blade are fixed to the strip frame structure. A cam having a structure such as a heart was used to convert the rotational motion into the translational motion.

Such a conventional method of fixing the polishing blade is vulnerable to a lateral force generated due to friction during the translational motion transmitted from the handpiece and during polishing of the tooth surface, and the accuracy of polishing is lowered due to warping of the polishing blade during orthodontic treatment There is a disadvantage in that it is not suitable for detailed work and the area to be fixed is narrow and the stability in polishing is inferior.

Further, the structure of the cam used in the conventional handpiece has a structure in which it is reciprocated once per rotation, and there is a disadvantage that the conversion efficiency in which the rotational motion is converted into the translational motion drops.

Accordingly, it is possible to provide a strip having a polishing blade fixed in such a manner that it is suitable for finer work and has a large area to be fixed so as to enhance stability, because it has strong resistance to lateral forces generated by friction during translational motion and tooth surface polishing, It is required to develop a polishing system for orthodontic treatment in which a cam structure with a high conversion efficiency is provided.

Korean Patent No. 10-1751429 (Title: Strip for orthodontic treatment) Korean Patent Laid-Open No. 10-2014-0143400 (entitled: Dental Vibration Angle Handpiece)

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is an object of the present invention to provide a method of polishing a tooth surface for securing a space between teeth, And a grinding blade is fixed in such a manner that the grinding blade is fixed in such a manner that the grasping force is strong against the lateral force and is suitable for detailed work and the area to be fixed is wide and stability can be enhanced.

It is still another object of the present invention to provide a tooth polishing apparatus and method for a tooth polishing apparatus which converts a rotational motion into a translational motion in a handpiece so that a strip coupled to a handpiece can translate, .

According to an aspect of the present invention, there is provided a polishing system for orthodontic treatment comprising: a strip adapted to perform a polishing process on a predetermined portion of a tooth surface; And a second power for causing the first power to rotate and the second power for causing the strip to perform the polishing process, And a dental handpiece, wherein the strip has a cylindrical shape and is coupled to the handpiece and adapted to receive the second power from the handpiece; A fixing portion extending from the coupling portion by a predetermined length and partially cut in the longitudinal direction to provide a first contact surface; And a polishing blade having a second contact surface at an upper end thereof and a polishing surface for forming the polishing surface at a lower end of the polishing pad, wherein the strip has a second contact surface in contact with the first contact surface, The longitudinal axes of the polishing blades are all fixed so that the shape of the abrasive blades is not deformed during the polishing process so that the precision polishing operation can be performed.

Here, the fixing portion is formed so that a part of the fixing portion is cut in the transverse direction and the longitudinal direction in the longitudinal direction, and is formed into a sector shape whose cross section has an internal angle of 90 degrees, so that a part thereof is cut in one transverse direction in the longitudinal direction, The area of the polishing surface can be widened as compared with a case where the polishing surface is provided so as to have a fan shape.

The handpiece includes: a first body portion for generating the first power; And a second body part connected to the first body part to receive the first power and to convert the received first power into the second power and transmit the converted second power to the strip, A second body housing forming an outer shape of the second body portion; A cam member for converting the received first power into the second power; And a translating member that is provided to be able to engage with the strip and that receives the converted second power from the cam member when the strip is engaged and transmits the second power to the combined strip by translating the strip; . ≪ / RTI >

Further, the cam member is composed of three surfaces of a shape whose outer periphery has a predetermined curvature and which has a surface that gradually widens from one end to a third point and narrows from one third point to the other end, A circular body which is formed in a plate shape by being coupled with a central angle of 120 degrees with respect to the one end based on the one end and performs the rotational motion by the first power; And a follower provided so that one end thereof is in contact with the outer circumference of the cantilever, wherein the cantilever is configured such that the cantilever rotates and abuts against an outer circumference of the cantilever which is distant from the center of the cantilever And when the cantilever rotates to come in contact with the outer circumference of the cantilever which is close to the center of the cantilever, the cantilever moves in a direction to approach the cantilever , The first power is converted into the second power, and the converted second power is transmitted to the translating member. By the shape of the outer periphery of the cantilever, each time the cantilever rotates once, The fuselage can make three reciprocating translations.

The translucent member is provided with a plurality of first grooves at an interface between the translucent member and the second body housing, and the second body housing includes a plurality of first grooves and a plurality of second grooves, Wherein the translucent member is inserted in a groove in the shape of a cylinder so that the translucent member is longitudinally moved in the translational direction so that the translucent member can translate only in a predetermined path, Can be prevented.

The second body housing may be provided to closely surround the outer circumference of the translating member, and the translating member may have a curved surface formed on the side surface thereof, and may be fitted into the second body housing, The folded surface is hooked to the second body housing so that the translational movement can be performed only in a predetermined path, but rotation can be prevented, thereby preventing deviation of the set route.

As a result, it is possible to prevent a shape deformation such as a warp from occurring in the polishing blade generated in the process of polishing the tooth surface, thereby making it possible to carry out a precision polishing operation and improve the stability in the polishing operation.

In addition, the conversion efficiency can be increased when the rotary motion is converted into translational motion in the handpiece.

1 is a schematic view of a polishing system for orthodontic treatment according to an embodiment of the present invention.
FIG. 2 is a view for explaining a configuration of a strip of a polishing system for teeth correction according to an embodiment of the present invention.
3 is a view illustrating a structure of a second body part of a polishing system for orthodontic treatment according to an embodiment of the present invention.
4 is a view for explaining the cam member of the polishing system for teeth correction according to an embodiment of the present invention in more detail.
5 is a view for explaining a fixing member of a polishing system for orthodontic treatment according to an embodiment of the present invention.
6 is a view for explaining a translating member according to another embodiment of the present invention.
FIG. 7 is a view illustrating a second body housing and a translating member according to another embodiment of the present invention in more detail.

Hereinafter, the present invention will be described in detail with reference to the drawings. The embodiments described below are provided by way of example so that those skilled in the art will be able to fully understand the spirit of the present invention. The present invention is not limited to the embodiments described below and may be embodied in other forms. In order to clearly explain the present invention, parts not related to the description are omitted from the drawings, and the width, length, thickness, etc. of the components may be exaggerated for convenience. Like reference numerals refer to like elements throughout the specification.

FIG. 1 is a schematic view of a polishing system for orthodontics according to an embodiment of the present invention. FIG. 2 (a) is a cross-sectional view of a strip 200 of a polishing system for orthodontic treatment according to an embodiment of the present invention. 2 (b) is a cross-sectional view of a polishing tool according to an embodiment of the present invention, in which a second contact surface 251 and a polishing surface 252 of the polishing blade 250 of the orthodontic polishing system are provided Fig.

Hereinafter, a polishing system for orthodontic treatment according to the present embodiment will be described with reference to FIGS.

The polishing system for orthodontic treatment of the present invention prevents precision deformation of the polishing blade 250 caused by the process of polishing the tooth surface and prevents deformation such as warping, So as to increase the stability and to improve the conversion efficiency in converting the rotational motion into the translational motion in the handpiece 100. [

To this end, the present polishing system for orthodontic treatment comprises a handpiece 100 and a strip 200.

Specifically, the handpiece 100 converts the first power for rotating movement into a second power for translating movement (forward movement), and transmits the converted second power to the strip 200 A first body part 110, and a second body part 130. The first body part 110 and the second body part 130 may have the same shape.

The first body part 110 is provided to generate a first power to rotate and transmit the generated first power to the second body part 130. For this purpose, a motor (not shown) and a power transmitting member (not shown) So that the first power generated by the motor (not shown) can be transmitted to the rotation shaft 133a, which will be described later, through the power transmitting member (not shown).

The second body part 130 converts the second power into a second power for transmitting the first power from the first body part 110 and transmitting the second power to the strip 200, And may include a second body housing 110, a cam member 133, and a translating member 135 for this purpose.

Here, a more detailed description of the second body part 130 will be described later with reference to FIGS.

The strip 200 includes a coupling portion 210, a fixing portion 230, and a polishing blade (not shown) for receiving a second power from the handpiece 100 to perform a polishing process on a predetermined portion of the tooth surface. 250).

The coupling portion 210 may be formed in a cylindrical shape in order to be coupled to the handpiece 100 and to receive the second power from the handpiece 100.

The fixing part 230 is extended from the coupling part 210 by a predetermined length so as to fix the polishing blade 250 and transmit the second power received from the coupling part 210 to the polishing blade 250 And a first contact surface 231, which is formed by cutting a part in the longitudinal direction, may be provided.

The polishing blade 250 is fixed to the fixing portion 230 and is rotated by the second power transmitted from the fixing portion 230 to perform a polishing process on a predetermined portion of the tooth surface. The contact surface 251 and the polishing surface 252 may be included.

The second contact surface 251 is provided in the same shape as the first contact surface 231 at the upper end of one surface of the polishing blade 250 so as to be fixed to the first contact surface 231, The polishing blade 250 may be fixed to the fixing portion 230 by being soldered or adhered to the fixing portion 230 in a state of being closely attached to the fixing portion 231.

As a result, the longitudinal axis of the abrasive blade 250 is fixed to the fixing portion 230, so that the abutment of the abrasive blade 250 and the abrasive blade 250 And the shape of the polishing blade 250 due to the lateral force generated by the friction between the tooth surface and the tooth surface is prevented from being deformed such as warpage.

Further, since the first contact surface 231 and the second contact surface 251 are fixed in close contact with each other, the fixed area is widened and the fixed area is widened, so that the stability in the polishing operation can be enhanced have.

Incidentally, the conventional abrasive blade fixing method is a method in which the abrasive blade is bent or broken during the abrading operation in such a manner that both longitudinal ends of the abrading blade are fixed to a U-shaped frame serving as a fixing part do.

The polishing surface 252 is provided on one surface and the other surface of the polishing blade 250 to polish the tooth surface through translational movement by the transmitted second power, and diamond powder may be coated to increase the polishing force, A plurality of perforated holes (not shown) may be formed to prevent deformation by heat generated by the tooth surface and friction.

For example, in order to allow the polishing surface 252 to be formed wider in the height direction, the fixing portion 230 is cut in the transverse direction and the transverse direction in the longitudinal direction, In this case, the second contact surface 251 may have the same shape as that of the first contact surface 231. In this case, the first contact surface 231 may be formed to have the same shape as the first contact surface 231 The area occupied by the first contact surface 231 can be reduced and the polishing surface 252 can be formed wider.

A cushion layer (not shown) may be formed on the other surface of the fixing portion 230 when the fixing portion 230 is cut in both the longitudinal and transverse directions. When the cushion layer is formed, the cushion layer (not shown) The abrasive blade 250 is inserted into the interdental region at a predetermined depth or more so that the abrasive blade 250 contacts the end of the tooth in a state where the abrasive blade 250 is inserted into the interdental space and the tooth tip is not damaged during the polishing process. It can act as a safeguard against

FIG. 3 is a view illustrating a structure of a second body part 130 of a polishing system for orthodontic treatment according to an embodiment of the present invention. FIG. 4 is a perspective view of a polishing tool according to an embodiment of the present invention, And the cam member 133 is viewed from above in order to explain the cam member 133 of the system.

Hereinafter, the second body part 130 of the polishing system for orthodontic treatment according to the present embodiment will be described in more detail with reference to FIGS.

The second body portion 130 converts the second power into a second power that receives the first power from the first body portion 110 and performs translational motion, And may include a second body housing 131, a cam member 133, and a translating member 135 for this purpose.

The second body part 131 is provided to form the outer shape of the second body part 130, and a space may be provided in the second body part 131 to accommodate other configurations.

The cam member 133 may include a rotary shaft 133a, a circular member 133b, and a follower member 133c to convert the first power into the second power.

Specifically, the rotary shaft 133a is provided to receive the first power from the power transmitting member (not shown) of the first body part 110 and to transmit the first power to the circular body 133b. For this purpose, A part of the upper end of the rotating shaft 133a is formed to be thicker than the other part so as to abut the outer periphery of the rotating shaft 133a and the inner surface of the second body housing 131, When the rotary shaft 133a rotates, it can serve as a guide so as not to move in the horizontal direction.

In FIG. 3, the portions that are formed thicker than the other portions to serve as guides on the rotary shaft 133a are shown as one, but they may be provided in plural as needed.

The circular member 133b may be provided to transmit the first power from the rotary shaft 133a to rotate, and to transmit the first power to the follower 133c.

To this end, the circular body 133b is gradually expanded from the one end to the third point, and has three surfaces of the same shape as the egg having the curvature of the outer periphery having a predetermined curvature, And the three sides are connected to each other so that the central angle between them is 120 degrees with respect to one end to form a plate and the center portion can be connected to the rotation shaft 133a.

Due to the above-described configuration, the cylindrical body 133b can have an outer periphery having a long and a short radius repeated three times.

The follower body 133c is configured to receive the first power from the driving body 133b and to convert the first power into the second power in the transmission process and to transmit the converted second power to the translating member 135 do.

More specifically, the follower 133c is provided with an elastic member (not shown) so that one end of the follower 133c is kept in close contact with any one of the outer circumferences of the circle 133b and is rotated by the rotation of the circle 133b When the radius of the cylindrical body 133b becomes longer at the close contact point, the cylindrical body 133b moves in a direction away from the cylindrical body 133b. When the radius of the cylindrical body becomes shorter at the point where the cylindrical body 133b is closely contacted by the rotation of the cylindrical body 133b, It can be moved in the direction close to the cylindrical body 133b.

In this process, the rotary motion is converted into the translational motion, and when the rotary body 133b makes one rotation by the outer circumference of the rotary body 133b whose long and short ends of the radius are repeated three times, It can be done by translating the round trip.

For example, the follower body 133c can be brought into close contact with the valley formed on the outer circumference of the body 133b by adjusting the width of one end of the follower body 133b that is in close contact with the outer circumference of the body 133b And the width of the translational motion can be controlled.

In another example, in a section where the radius of the outer periphery of the radial body of the radial body 133b is reduced to a certain level or less by adjusting the degree to which the moving body 133c is brought into close contact with the peripheral edge of the radial body 133b by the elastic member, 133c and the outer circumferential edge of the driving body 133b are not in close contact with each other.

As another example, the follower body 133c is provided with a wheel member (not shown) at one end which is in close contact with the outer peripheral edge of the cylindrical body 133b, thereby reducing the friction with the cylindrical body 133b.

As another example, among the shapes of the circular body 133b, the reference point for narrowing the area from one end may be a point other than the 1/3 point, and the length from one end to the other end of the three faces may be set differently .

If the lengths from one end to the other end of the three surfaces of the driving body 133b are set to be different from each other, each time the driving body 133b makes one revolution, the driven body 133c reciprocates three times, The use of the handpiece 100 can be diversified. In addition, when the strip 200 is used in combination with the handpiece 100, the width of the reciprocation of the strip 200 becomes uneven and the heat generation can be reduced.

The translating member 135 is provided to transmit the second power from the driven member 133c to translate and to transmit the second power to the strip 200 by being engaged with the engaging portion 210, And may be in the form of a hollow cylinder so that the coupling portion 210 of the strip 200 is received in and coupled to the follower 133c.

More specifically, the translating member 135 receives the second power from the driven member 133c and is translationally moved. By causing the strip 200 coupled to the translating member 135 to translate together, .

The engaging groove 210 is formed in the engaging portion 210 and the engaging portion 210 engaged with the translating member 135 is not separated from the engaging groove 211 by engaging the engaging groove 211 with the translating member 135 A clip 135a may be provided.

Fig. 5 is a view for explaining the fixing member 137 of the polishing system for orthodontic treatment according to the embodiment of the present invention.

Hereinafter, the fixing member 137 of the polishing system for orthodontic treatment according to the present embodiment will be described with reference to FIG.

The second body part 130 is moved in the second body part 131 by the translational movement of the second body part 131, the cam member 133 and the translating member 135, A plurality of fixing members 137 may be further included.

When a plurality of fixing members 137 are further included, the translating member 135 is provided with a plurality of first grooves (not shown) at an interface between the second body housing 131 and the second body housing 131, A plurality of second grooves (not shown) each having a columnar shape are provided, the grooves 131 being located at each of the boundary surfaces abutting the plurality of first grooves (not shown) .

The plurality of fixing members 137 are provided in the form of a wedge-like post so that the translating member 135 is translationally moved in a cylindrical groove formed by a plurality of first grooves (not shown) and a plurality of second grooves (not shown) So that the translating member 135 can be translated only in the set path, and the deviation of the path due to the rotation of the translating member 135 can be prevented.

6 is a view for explaining the translating member 135 according to another embodiment of the present invention. FIG. 7 is a sectional view of the second body housing 131 and the translating member 135 according to another embodiment of the present invention. Is a cross-sectional view for illustrating in more detail.

Hereinafter, the second body housing 131 and the translating member 135 according to another embodiment of the present invention will be described with reference to FIGS.

The second body part 130 may further include a plurality of fixing members 137 to translate the translating member 135 in a predetermined path but prevent the translating member 135 from being separated from the second body part 130. In this case, However, in another embodiment of the present invention, the translating member 135 may be formed in a bent shape on both left and right sides in order to translationally move in a predetermined path, but to prevent a path deviation due to rotation.

6, when the translating member 135 is formed in a bent shape on both sides, the second body housing 131 is provided so as to be closely attached to the outer circumference of the translating member 135, The translating member 135 is fitted into the second body housing 131 and the bent side surfaces of the translating member 135 are engaged with the second body housing 131, So that it is possible to prevent the deviation of the path due to the rotation.

The second body housing 131 is configured to receive the clip 135a for fixing the coupling portion 210 inserted into the translating member 135 when the translating member 135 is provided with a bent surface The first clip groove 131a and the translating member 135 may include the second clip groove 135b.

Specifically, the first clip groove 131a may be a groove provided so that the clip 135a is not accommodated in the inside of the translating member 135 but the exposed portion is accommodated.

7, when the clip 135a is U-shaped and the linear portion of the clip 135a is accommodated in the inside of the translating member 135, the first clip groove 131a may be a C-shaped groove similar to the shape of the exposed portion of the clip 135a.

The first clip groove 131a is provided with a groove having an open area equal to or larger than the area of the translation path of the clip 135a so that the clip 135a can be translationally moved by the translational movement of the translational member 135 .

The second clip groove 135b corresponds to a portion in which the clip 135a is received in the inside of the translating member 135 so that the clip 135a can be provided partially accommodated in the inside of the translating member 135 And an additional space may be provided to allow the clip 135a to be opened in the process of coupling the coupling portion 210 to the translation member 135. [

 The second clip groove 135b is formed in the second clip groove 135b in order to reduce the difficulty of insertion by the elasticity of the clip 135a in the course of insertion of the clip 135a into the second clip groove 135b. And the outer surface forming the second clip groove 135b is formed in a predetermined shape so that the outer surface of the second clip groove 135b is in contact with the outer surface of the second body housing 131, So that the clip 135a can be guided so that the end of the clip 135a gradually becomes erroneously inserted.

The second clip groove 135b may be formed in one embodiment as well as other embodiments of the present invention, and may be applied to the same shape.

According to the above description, the polishing system for orthodontic treatment of the present invention can prevent the shape deformation such as warping of the polishing blade, which is generated in the process of polishing the tooth surface, so that the precision polishing operation becomes possible and the stability in the polishing operation can be enhanced And the conversion efficiency can be increased when the rotary motion is converted into translational motion in the handpiece.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be construed as limiting the scope of the invention as defined by the appended claims. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.

100: handpiece 110: first body part
130: second body part 131: second body part housing
131a: first clip groove 133: cam member
133a: rotating shaft 133b:
133c: follower body 135: translational member
135a: clip 135b: second clip groove
137: fixing member 200: strip
210: engaging portion 211: engaging groove
230: fixing part 231: first contact surface
250: abrasive blade 251: second contact surface
252: Polishing surface

Claims (6)

A strip on which a polishing process for a predetermined part of the tooth surface is performed; And
Wherein the first power for rotating is converted into a second power for translational movement and the second power is transmitted to the combined strip so that the strip performs the polishing process. And a handpiece,
Wherein the strip comprises:
A coupling portion coupled to the handpiece and configured to receive the second power from the handpiece in a cylindrical shape;
A fixing portion extending from the coupling portion by a predetermined length and partially cut in the longitudinal direction to provide a first contact surface; And
And a polishing blade having a second contact surface at an upper end thereof and a polishing surface for polishing the lower surface thereof,
Wherein the strip comprises:
And the second abutting surface is in close contact with the first abutting surface so that the longitudinal axis of the abrasive blade is all fixed so that the shape of the abrasive blade is not deformed during the abrading process, Precision grinding work is possible,
The handpiece includes:
A first body portion for generating the first power; And
And a second body portion connected to the first body portion to receive the first power and to convert the received first power into the second power and transmit the converted second power to the strip,
The second body portion
A second body housing forming an outer shape of the second body portion;
A cam member for converting the received first power into the second power; And
And a translating member that is provided to be able to engage with the strip and that receives the converted second power from the cam member when the strip is engaged and transmits the second power to the combined strip by translating the strip, Wherein the polishing apparatus comprises: The method according to claim 1,
The fixing unit includes:
A part of which is cut in both the longitudinal and transverse directions to form a sectoral shape whose cross section has an internal angle of 90 degrees so that a part thereof is cut in one transverse direction in the longitudinal direction so that the cross- And the area of the polishing surface is wider than that of the polishing surface. delete The method according to claim 1,
Wherein the cam member
A third surface having a curvature that gradually widens from the first end to a third point and narrows from the third point to the other end, the outer periphery having a predetermined curvature, A driving unit having a center angle of 120 degrees with respect to each other to form a plate shape and to perform the rotational motion by the first power; And
And a follower provided at one end in contact with the outer circumference of the circulator,
The follower
When the cantilever rotates and comes into contact with the outer periphery of the cantilever which is distant from the center of the cantilever, the cantilever moves in a direction away from the cantilever so that the cantilever rotates and the distance from the center of the cantilever Wherein the second translational force is transmitted to the translational member by converting the first power into the second power when the translational movement of the translational second power is in contact with the outer periphery of the near circle, And the follower reciprocates by three reciprocations every time the circle is rotated by the shape of the outer periphery of the circle. The method according to claim 1,
The translating member includes:
A plurality of first grooves are formed at an interface between the second body housing and the second body housing,
The second body housing may include:
A plurality of second grooves each having a columnar shape are provided, the grooves being located at respective boundary surfaces contacting the plurality of first grooves,
The second body portion
And a plurality of fixing members provided in a cylindrical shape,
Wherein the plurality of fixing members comprise:
The translucent member is inserted into the cylindrical groove formed by the plurality of first grooves and the plurality of second grooves so as to be in the longitudinal direction in the direction in which the translational movement is performed, Wherein the guide member is guided so as to prevent rotation of the translating member to prevent departure of the predetermined path. The method according to claim 1,
The second body housing may include:
And an outer circumferential surface of the translucent member,
The translating member includes:
And the second body portion is engaged with the second body portion so that the bent portion is engaged with the second body portion so that the second body portion can be translated only in a predetermined path, Thereby preventing departure of the set path.

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