Patent Publication Number: US-2012033315-A1

Title: Scanner motor

Description:
CROSS REFERENCE TO RELATED APPLICATION 
     This application claims the benefit of Korean Patent Application No. 10-2010-0076065, filed on Aug. 6, 2010, entitled “Scanner Motor” which is hereby incorporated by reference in its entirety into this application. 
     BACKGROUND OF THE INVENTION 
     1. Technical Field 
     The present invention relates to a scanner motor. 
     2. Description of the Related Art 
     The present invention relates to a scanner motor used in an output device using an optical technology, such as a laser beam printer or a scanner, to rotate a polygon mirror. As the market for an output device using an optical technology is leading to compactness and high speed, there is a demand for increased performance in an actuator driving an optical reflective device, which is a core component such as a polygon mirror. 
     At present, a polygon mirror applied to a polygon scanner motor has been manufactured by mechanically machining aluminum (Al). 
     In addition, due to a continuous shortage of a polygon mirror in the current market, a manufacturing method using glass has been considered as a solution. However, there has been a difficulty in generating a central hole through which the polygon mirror is connected to a rotary body. 
     In other words, the polygon mirror according to the prior art is formed with a hole for assembling in the center thereof, and is assembled with a rotary body based on the hole. 
     Through the structure, the polygon mirror may be assembled relatively simply and precisely with the rotary body but a central hole must be formed in the polygon mirror, thereby causing problems in that manufacturing costs are increased and the manufacturing methods are limited. 
     SUMMARY OF THE INVENTION 
     The present invention has been made in an effort to provide a scanner motor with a simple manufacturing process and high product reliability of a product by mounting and bonding a rectangular parallelepiped polygon mirror on a top of a rotor case. 
     A scanner motor according to a preferred embodiment of the present invention includes: a rotor case fixed on a rotation shaft to be rotated; a polygon mirror mounted on a top of the rotor case; and a bonding part formed between the rotor case and the polygon mirror to fix the polygon mirror on the rotor case. 
     Herein, the polygon mirror may have a rectangular parallelepiped shape. 
     The rotor case may be formed with a step part, wherein the step part is formed on an outer circumferential portion so that it corresponds to an outer circumferential portion of the polygon mirror. 
     Edges of the polygon mirror may be in contact with the step part of the rotor case. 
     The bonding part may be applied with a bonding agent or an adhesive. 
     The polygon mirror may be made of glass or plastic. 
     The rotor case may be formed with a groove part in which the bonding agent is filled so that the polygon mirror is fixed on the contact surface with the polygon mirror. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a partial perspective view of a scanner motor according to a preferred embodiment of the present invention; 
         FIG. 2  is a partial cross-sectional view of a scanner motor according to a preferred embodiment of the present invention; and 
         FIG. 3  is a partial enlarged view of a scanner motor according to a preferred embodiment of the present invention. 
     
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Various features and advantages of the present invention will be more obvious from the following description with reference to the accompanying drawings. 
     The terms and words used in the present specification and claims should not be interpreted as being limited to typical meanings or dictionary definitions, but should be interpreted as having meanings and concepts relevant to the technical scope of the present invention based on the rule according to which an inventor can appropriately define the concept of the term to describe most appropriately the best method he or she knows for carrying out the invention. 
     The above and other objects, features and advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings. In the specification, in adding reference numerals to components throughout the drawings, it is to be noted that like reference numerals designate like components even though components are shown in different drawings. Further, when it is determined that the detailed description of the known art related to the present invention may obscure the gist of the present invention, the detailed description thereof will be omitted. 
     Hereinafter, a scanner motor according to preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. 
       FIG. 1  is a partial perspective view of a scanner motor according to a preferred embodiment of the present invention,  FIG. 2  is a partial cross-sectional view of a scanner motor according to a preferred embodiment of the present invention, and  FIG. 3  is a partial enlarged view of a scanner motor according to a preferred embodiment of the present invention. 
     First,  FIG. 1  shows a partial perspective view of a scanner motor according to a preferred embodiment of the present invention, wherein the scanner motor includes a rotor case  110 , a polygon mirror  120 , and a bonding part  130 . 
     The rotor case  110 , fixed on a rotation shaft to be rotated, may be formed with a step part formed on an outer circumferential portion so that the polygon mirror  120  is mounted on the top thereof 
     In addition, the rotor case  110  may preferably have a cup shape manufactured by a press method. 
     The rotor case  110  may be formed with a groove part (not shown) of which a bonding surface on which the polygon mirror  120  is mounted is filled with a bonding agent in order to fix the polygon mirror  120  mounted on the top thereof using the bonding part  130  to prevent the polygon mirror  120  from being detached. 
     The polygon mirror  120 , which deflectively scans light beam emitted from a light source (not shown), is mounted on the top of the rotor case  110 . 
     At this time, the polygon mirror  120  is a rectangular parallelepiped without an assembling hole in an inner diameter thereof, wherein an outer circumferential portion and edges of the polygon mirror  120  are in contact with a step part formed on an outer circumferential surface of the rotor case  110 . 
     Although the number of edges (angles) of the polygon mirror  120  is not limited, the size of the polygon mirror  120  is increased in a case of a quadrangle or more, such that a quadrangular shape is most preferable. 
     As described above, the polygon mirror  120  of the scanner motor according to the present invention has a rectangular parallelepiped shape without an assembling hole therein, thereby making it possible to prevent defects and costs from occurring beforehand when forming an assembling hole in an inner diameter of the polygon mirror  120  according to the prior art and be easily mounted on the top of the rotor case  110 . 
     In addition, the polygon mirror  120  of the scanner motor according to the present invention may be made of glass or plastic. 
     The bonding part  130  is a portion fixing between the rotor case  110  and the polygon mirror  120  using a bonding agent or an adhesive. 
     In other words, the polygon mirror  120  is mounted on the top of the rotor case  110 , and between the rotor case  110  and the polygon mirror  120  that are in contact with the inner diameter of the step part formed on the outer circumferential surface of the rotor case  110  is fixed using a bonding agent or an adhesive. 
     After the polygon mirror  120  is mounted so that its edges are in internal contact with the inner diameter of the rotor case  110 , the bonding part  130  applies a bonding agent between the edge portions of the polygon mirror  120  and the rotor case  110 . The kinds of bonding agent and adhesive are not limited, but UV bonding or an adhesive may be used. 
       FIG. 2  is a partial cross-sectional view of a scanner motor according to a preferred embodiment of the present invention, wherein the rectangular parallelepiped shaped polygon mirror  120  is mounted on the top of the rotor case  110 . 
     The plurality of bonding parts  130  are formed between the rotor case  110  and the polygon mirror  120  and the bonding parts  130  are generally formed between the edges of the polygon mirror  120  and the inner diameter of the rotor case  110 . 
     As another embodiment, the bonding part  130  may have a groove part (not shown) formed on a bonding surface of the rotor case  110  to which the polygon mirror  120  is bonded, to mount the polygon mirror  120  on the top of the rotor case  110  by filling the groove part with an adhesive or a bonding agent. 
     The bonding part  130  is made by being filled with various kinds of adhesives or UV bonding agents and then being cured. 
       FIG. 3  is a partial enlarged view of a scanner motor according to a preferred embodiment of the present invention, wherein the bonding part  130  is formed by contacting the inner diameter of the rotor case  110  with the edge of the polygon mirror  120  and then bonding or attaching them. 
     The bonding part  130  may be made of various adhesive materials, such as a UV bonding agent or general adhesives. In addition, although the forming position and the number of bonding part  130  are not limited, it is preferable that the bonding part  130  is formed on each contact surface between the edge of the polygon mirror  120  and the rotor case  110  in order to prevent the rotor case  110  and the polygon mirror  120  from being detached at the time of rotating the motor. 
     The scanner motor according to the present invention having the configuration as described above includes the rectangular parallelepiped shaped polygon mirror  120  without an assembling hole and the bonding part  130  formed between the rotor case  110  and the polygon mirror to simplify the manufacturing process of the polygon mirror  120  and improve the freedom degree in the manufacturing method, thereby reducing costs. 
     The scanner motor according to the preferred embodiments of the present invention includes the rectangular parallelepiped shaped polygon mirror without an assembling hole and the bonding part formed between the rotor case and the polygon mirror to simplify the manufacturing process of the polygon mirror and improve the freedom degree in the manufacturing method, thereby reducing costs. 
     Therefore, it is possible to reduce defects generated when forming a hole in the polygon mirror according to the prior art, remarkably reduce manufacturing time, and improve product reliability. 
     Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, they are for specifically explaining the present invention and thus a scanner motor according to the present invention is not limited thereto, but those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims. 
     Accordingly, such modifications, additions and substitutions should also be understood to fall within the scope of the present invention.