Abstract:
A chip module package structure applied to an optical input device includes a cover body, a first chip module, and a second chip module. The first chip module and the second chip module are respectively combined with the cover body, the first chip module has an optical source, and the second chip module has an optical sensor. Further, the optical source and the optical sensor form a preset relative spatial position relation, such that a part of light emitted by the optical source is received by the optical sensor after at least one reflection.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This non-provisional application claims priority under 35 U.S.C. §119(a) on Patent Application No(s). 099203302 filed in Taiwan, R.O.C. on Feb. 12, 2010, the entire contents of which are hereby incorporated by reference. 
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a package structure, and more particularly to a chip module package structure. 
     2. Related Art 
     With the rapid development and advancement of the electronic industry, various electronic products have been widely applied in daily lives, and provide more diversified functional options for users. The functional options of the electronic products usually need to be achieved by peripheral input devices (for example, a mouse, a keyboard, and a remote controller) of the electronic products. 
     For example, in a computer system, instructions are usually input and operated by using a mouse device. Generally, mice can be approximately categorized into two types, namely, mechanical and optical mice. A mechanical mouse mainly utilizes rotation of a trackball disposed at a bottom thereof to drive a sensing element in the mouse, so as to calculate a moving distance of the mouse. However, during rotation, the trackball is easily abraded due to an operation plane (for example, a table top or mouse pad) on which the mouse is placed, and easily carries impurities such as dust and cotton flock on the operation plane into the mouse, resulting in that the accuracy of the mechanical mouse is easily degraded after a long time of use. 
     An optical mouse is based on optics principles, in which an optical source irradiates a surface, a beam reflected back is picked up within a certain period of time, and by means of rapid scan and pickup, a moving direction and a moving distance of the optical mouse are calculated through comparison. The optical mouse replaces the trackball with the optical technique, so as to solve the problem that the trackball of the mechanical mouse is easily abraded and impurities easily accumulate in the mechanical mouse. Generally, in terms of structural configuration, the optical mouse mainly includes an upper housing and a lower housing, and a lens assembly and a circuit board are disposed in an accommodation space formed by the upper housing and the lower housing. The lens assembly is disposed on the lower housing, a light emitting diode (LED) and a sensor are inserted on the circuit board, and bottom sides of the LED and the sensor are corresponding to the lens assembly. In use, a light ray signal emitted by the LED emits passes through a first lens of the lens assembly, and is refracted to a surface (for example, a table top) by a reflecting mirror, reflected to a second lens of the lens assembly by the surface, and then received by the sensor. 
     However, in the main structure of the conventional optical mouse, since the LED and the sensor need to be respectively disposed on the circuit board, and relative positions of the LED and the sensor need to be accurately adjusted accordingly, the assembly time required for the conventional optical mouse is rather long, resulting in an excessive manufacturing and production cost. 
     SUMMARY OF THE INVENTION 
     In view of the above problems, the present invention is a chip module package structure, which can solve the problem that during the manufacturing and assembly of a conventional optical mouse, since an LED and a sensor need to be respectively disposed on a circuit board, and positions of the LED and the sensor need to be adjusted, the assembly time required for the conventional optical mouse is rather long, thereby affecting the production efficiency of an optical input device. 
     The present invention provides a chip module package structure, which comprises a cover body, a first chip module, and a second chip module. The cover body has a first combining region and a second combining region. The first chip module is combined with the first combining region of the cover body, and has a first accommodation space and an optical source on one side of the first chip module opposite to the cover body, in which the optical source is disposed in the first accommodation space. The second chip module is combined with the second combining region of the cover body, and has a second accommodation space and an optical sensor on one side of the second chip module opposite to the cover body, in which the optical sensor is disposed in the second accommodation space. When the first chip module and the second chip module are combined with the cover body, the optical source of the first chip module and the optical sensor of the second chip module perform a preset relative spatial position relation, such that a part of light emitted by the optical source is received by the optical sensor after at least one reflection. 
     In the chip module package structure according to the present invention, a first chip module and a second chip module are integrated on a cover body. When the chip module package structure is disposed in the optical input device, the first chip module and the second chip module can be disposed at the same time in a single operation process, thereby saving the time required for assembling the chip module package structure into the optical input device. Meanwhile, the first chip module and the second chip module are respectively combined with the cover body, such that when one of the first chip module and the second chip module is damaged, only the damaged first chip module or the damaged second chip module needs to be replaced, instead of replacing the whole chip module package structure, thereby effectively saving the manufacturing and production cost of the chip module package structure. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The present invention will become more fully understood from the detailed description given herein below for illustration only, and thus are not limitative of the present invention, and wherein: 
         FIG. 1  is a schematic exploded view of an embodiment of the present invention; 
         FIG. 2  is a schematic assembled view of an embodiment of the present invention; and 
         FIG. 3  is a schematic assembled view of an embodiment of the present invention from another angle of view. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     Referring to  FIGS. 1 to 3 , a chip module package structure according to an embodiment of the present invention is applied to an optical input device (for example, an optical mouse), and the chip module package structure comprises a cover body  10 , a first chip module  20 , and a second chip module  30 . The cover body  10  has a combining surface  110 , a partitioning structure  120 , a side wall  130 , a first perforation  140 , and a second perforation  150 . The combining surface  110  has a first combining region  111  and a second combining region  112 , the partitioning structure  120  is disposed on the combining surface  110  and stands between the first combining region  111  and the second combining region  112 , and the side wall  40  surrounds a periphery of the combining surface  120 . The first perforation  140  and the second perforation  150  are respectively disposed in the first combining region  111  and the second combining region  112  of the combining surface  110 , and the first perforation  140  and the second perforation  150  respectively penetrate the first combining region  111  and the second combining region  112 . 
     The first chip module  20  is a light emitting chip module, and has a plurality of electrical pins  210 , a first accommodation space  220 , and an optical source  230 . The plurality of electrical pins  210  is respectively disposed on two opposite outer side surfaces  240  of the first chip module  20  and is connected to the optical source  230 , so as to provide electrical conduction between the optical source  230  and external circuit elements. The first accommodation space  220  is disposed between the two outer side surfaces  240 , and the first accommodation space  220  is corresponding to the first combining region  111  of the combining surface  110 . The optical source  230  is electrically disposed in the first accommodation space  220 , and may be an infrared ray, a laser diode (LD), an LED, or a vertical cavity surface emitting laser (VCSEL). Although not shown, the optical source  230  and the plurality of electrical pins  210  are electrically conducted. 
     The second chip module  30  is an optical sensing chip module, and has a plurality of electrical pins  310 , a second accommodation space  320 , and an optical sensor  330 . The plurality of electrical pins  310  is respectively disposed on two opposite outer side surfaces  340  of the second chip module  30  and is connected to the optical sensor  330 , so as to provide electrical conduction between the optical source  330  and external circuit elements, and the plurality of electrical pins  310  is also electrically conducted to the optical sensor  330  (not shown). The second accommodation space  320  is disposed between the two outer side surfaces  340 , and the second accommodation space  320  is corresponding to the second combining region  112  of the combining surface  110 . The optical source  330  is electrically disposed in the second accommodation space  320 . 
     The first chip module  20  and the second chip module  30  are respectively detachable combined with the first combining region  111  and the second combining region  112  of the combining surface  110 , and are respectively located on two ends of the cover body  10  as being partitioned by the partitioning structure  120 . Such that, the first chip module  20  and the second chip module  30  may be configured to be individually mounted on or removed from the cover body  10 . Besides, the function of partitioning the first combining region  111  and the second combining region  112 , the partitioning structure  120  is also used to block unnecessary light rays from leaking from the first chip module  20  to the second chip module  30 . A length and a width of the first combining region  111  of the combining surface  110  respectively match a length and a width of the first accommodation space  220 , and a length and a width of the second combining region  112  respectively match a length and a width of the second accommodation space  320 . Therefore, when the first chip module  20  and the second chip module  30  are respectively combined with the first combining region  111  and the second combining region  112 , the first accommodation space  220  of the first chip module  20  and the second accommodation space  320  of the second chip module  30  are respectively sleeved on the first combining region  111  and the second combining region  112 . Further, the side wall  130  on the combining surface  110  is embedded in the first accommodation space  220  and the second accommodation space  320 , such that the first chip module  20  and the second chip module  30  are pressed against the cover body  10  by the side wall  130 . In addition to being a partitioning structure, the partitioning structure  120  may be other structures having a partitioning function and capable of blocking unnecessary light rays, for example, the partitioning structure  120  may be two partitioning structures, respectively corresponding to the first accommodation space  220  and the second accommodation space  320 . 
     Afterward, the first chip module  20  and the second chip module  30  are stably disposed on the cover body  10  in a dispensing manner or other combining manners, or a hook and a recess (not shown) matching each other are disposed between the side wall  130  and the first chip module  20  and between the side wall  130  and the second chip module  30 , such that the first chip module  20  and the second chip module  30  are combined with the cover body  10  in a buckling manner. The above combining manners are illustrated by way of example only, but not intended to limit the present invention. 
     Referring to  FIGS. 1 to 3 , after the first chip module  20  and the second chip module  30  are combined with the cover body  10 , the optical source  230  of the first chip module  20  is corresponding to the first perforation  140  of the cover body  10 , the optical sensor  330  of the second chip module  30  is corresponding to the second perforation  150  of the cover body  10 , and the optical source  230  and the optical sensor  330  are blocked by the partitioning structure  120 , and thus are isolated in the first accommodation space  220  and the second accommodation space  320 . 
     In an application of the chip module package structure according to an embodiment of the present invention, the chip module package structure is disposed on a circuit board (not shown) of the optical input device, the chip module package structure is inserted to the circuit board through the electrical pins  210  of the first chip module  20  and the electrical pins  310  of the second chip module  30 , and is electrically conducted to the circuit board. When the optical source  230  of the first chip module  20  emits a light ray, since the optical source  230  and the optical sensor  330  are blocked by the partitioning structure  120 , the light ray can only pass through the first perforation  140 , and then the light ray is reflected by a reflecting surface to enter the second accommodation space  320  through the second perforation  150 , and is received by the optical sensor  330 . 
     In the chip module package structure according to the present invention, the first chip module and the second chip module are combined with the same cover body. When the chip module package structure is disposed on the optical input device, the procedure of disposing the chip module package structure can be simplified and the assembly time required for the chip module package structure can be saved. Meanwhile, the first chip module and the second chip module are respectively combined with the cover body, such that when one of the first chip module and the second chip module is damaged, only the damaged first chip module or the damaged second chip module needs to replaced, so as to prevent the discarding of the whole chip module package structure due to the damage of one of the first chip module and the second chip module, thereby saving the manufacturing and production cost of the chip module package structure.