Finger grip for smart device

1. A finger grip for a smart device, comprising:

a bonding sheet having a bonding surface attached to one side of an outer surface of the smart device, the bonding surface having a punched portion formed on one side of a top surface thereof, and a protection film for protecting the bonding surface;

a guide sheet coupled to one side surface of the bonding sheet and having a guide slot formed on one side thereof and a coupling groove formed on the other side thereof;

a variable sheet laminated on one side surface of the guide sheet and having a fusion portion formed correspondingly to the coupling groove and a slide pin formed protrudingly therefrom to pass through the guide slot;

a fixing rivet coupled to the slide pin of the variable sheet to prevent the slide pin from escaping from the guide slot; and

a printed film coupled to one side surface of the variable sheet,

wherein the guide slot of the guide sheet comprises at least one or more protruding portions protruding inwardly therefrom to fix the slide pin in position thereto, while the slide pin is reciprocatedly moving therealong, and an auxiliary groove adapted to seat a head of the fixing rivet thereonto to prevent the head from protruding outwardly therefrom, the protruding portions having first protrusions formed on the outside of the guide slot with respect to a center of the guide sheet in such a manner as to be symmetrical to each other on both sides of the inner peripheral surface of the guide slot to allow the variable sheet to be kept in the state of coming into close contact with the guide sheet.

2. The finger grip according to claim 1 , wherein the protruding portions have a plurality of second protrusions spaced apart from each other by a given distance on one side of the inner peripheral surface of the guide slot in the opposite direction to the first protrusions to allow the variable sheet to be kept in the state of being spaced apart from the guide sheet, while the spaced distance is being step by step adjusted.

3. The finger grip according to claim 1 , wherein the coupling groove comprises a concave-convex portion formed on the surface thereof so that the coupling groove is firmly fixed to the fusion portion.

4. The finger grip according to claim 1 , wherein the bonding sheet, the guide sheet, the variable sheet, and the fixing rivet are coupled to one another by means of any one selected from heat fusion, ultrasonic fusion, and bonding.

5. The finger grip according to claim 1 , wherein the guide sheet comprises at least one or more fixing members made of a magnetic material so that the smart device is attached to a predetermined position.