Abstract:
Apparatus such as a flexible printed circuit board (FPC) for coupling two electronic components that are configured to move relative to each other such as within a multi-part slide-open type camera, multi-part micro-scope, a scanner device, etc., that includes a first end configured to be coupled to a first electronic component, a flexible connecting member emanating from the first end, and a second end at which the connecting member terminates and which is used to connect the flexible connecting member to a second electronic component. The connecting member includes a component surface used to communicate electrical signals between the fist electronic component and the second electronic component. The flexible connecting member has a shape that permits it to extend and retract in directions substantially perpendicular to the component surface. The shape also permits the flexible connecting member to be maintained in a single plane when in a fully retracted state.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to devices such as flexible printed circuit boards used to couple electronic components within electronic devices such as cameras and the like. 
     2. Description of the Related Art 
     Many electronic devices such as cameras, etc., incorporate components that move relative to each other. Often, such moveable components must be electrically coupled to each other to facilitate power and data transfers. To couple such components, flexible printed circuit boards or “FPCs” often are used. An electronic device that utilizes a conventional type FPC is shown in drawing figures identified as FIGS. 1A,  1 B,  2 A, and  2 B which have been appended to this patent document. 
     FIGS. 1A and 1B are diagrams of a camera. More particularly, FIG. 1A shows a state in which a lens barrel  100  and photographic lens  105  are collapsed within a camera body  101 . FIG. 1B shows a state in which lens barrel  100  protrudes from camera body  101 . A circuit unit  102  used in performing focusing or shutter driving operations is disposed in lens barrel  100 . Circuit unit  102  is connected to a main device board (not shown in the drawing) disposed in camera body  101  at camera body point  104  via an FPC  103 . A connecting portion  102   a  of circuit unit  102  is used to connect to FPC  103 . Another connecting member  104   a  is maintained on the camera body side to connect to FPC  103 . 
     With reference to FIGS. 2A and 2B, depicted therein are diagrams of FPC  103  as originally shown in FIGS. 1A and 1B, respectively. FIG. 2A is a diagram that shows FPC  103  when lens barrel  100  is in a retracted or closed position. As shown, a gap Lo exists between circuit member  102  and camera body point  104  such that FPC  103  is maintained in a folded-up state. The fold or bend in FPC  103  occurs as a result of movement of lens barrel  100 . As shown in FIG. 2B, when lens barrel  100  is extended, FPC  103  is unfolded and gap Lo is widened. 
     Although FPC  103  permits electrical connection within camera  100 , stresses resulting from movement of FPC  103  concentrate in portion  103   a.  As a result, surface malformations and dis-connections often occurred as a result of repeated lens barrel movement. Such problems were exacerbated by the fact that the smaller the bending radius of portion  103   a  as shown in FIG. 2A, the larger the change of the angle θ as shown in FIG.  2 B. And, unfortunately, it was disadvantageous to make the folding space larger as internal spaces within camera body  101  needed to be correspondingly enlarged. 
     Thus, there exists a need to provide new and improved connecting devices such as FPCs that minimize and negate the effects of repeated movement and the like. Additionally, to be viable such connecting devices must be effective within small spaces such as those found within cameras and other compact electronic devices. 
     SUMMARY OF THE INVENTION 
     Accordingly, the present invention has as its principal object to solve the problems mentioned above. In so doing, the present invention provides a new flexible connecting apparatus that allows at least two electronic components to be connected to each other reliably and in situations where repeated movement of the two electronic devices is realized. As a result, the present invention provides certain benefits not heretofore realized by prior devices and, in particular, prior flexible printed circuit board components. For example, the present invention now provides device manufactures with a component that may be placed into small, tight spaces that can be reliably used to facilitate electrical and data connections among electronic components. By utilizing certain geometric shapes and patterns, a new flexible printed circuit board (FPC) is realized that better responds to destructive stresses from component movement and takes up less space inside of complex electronic devices such as cameras, microscopes, projection scanner equipment, etc. 
     The present invention solves the aforementioned problems to deliver the above-described benefits by providing an apparatus such as a flexible printed circuit board (FPC) for coupling two electronic components that are configured to move relative to each other such as within a multi-part, slide-open type camera, multi-part micro-scope, a scanner device, etc. that includes a first end configured to be coupled to a first electronic component, a flexible connecting member emanating from the first end, and a second end at which the connecting member terminates and which is used to connect the flexible connecting member to a second electronic component. The connecting member includes a component surface used to communicate electrical signals between the fist electronic component and the second electronic component. The flexible connecting member has a shape that permits it to extend and retract in directions substantially perpendicular to the component surface. The shape also permits the flexible connecting member to be maintained in a single plane when in a fully retracted state. 
    
    
     BRIEF DESCRIPTION OF THE DRAWING FIGURES 
     The present invention is described below with reference to the following drawing figures, of which: 
     FIGS. 1A and 1B are cross-section diagrams of a camera in both closed and open states, respectively, and which includes a flexible printed circuit board (FPC) to couple electronic components within the camera according to the prior art; 
     FIGS. 2A and 2B are diagrams of the FPC originally shown in FIGS. 1A and 2B, respectively; 
     FIG. 3 is a perspective view of a slide-open type camera that includes an apparatus for coupling electronic components provided in accordance with a preferred embodiment of the present invention; 
     FIG. 4 is a perspective view of the camera depicted in FIG. 3 in a closed state; 
     FIG. 5 is another perspective view of the camera depicted in FIG. 3; 
     FIG. 6 is another perspective view of the camera depicted in FIG. 3 after a slide cover has been closed; 
     FIG. 7 is a cross-section diagram of the camera shown in FIG.  5 . 
     FIG. 8 is a cross-section diagram of the of the camera shown in FIG.  6 . 
     FIGS. 9A and 9B are diagrams of a strobe unit mounting board that provided in accordance with a preferred embodiment of the present invention; 
     FIGS. 10A and 10B are diagrams of an exemplary mounting region of a printed circuit board that is configured to connect with an apparatus for coupling electronic components provided in accordance with a preferred embodiment of the present invention; 
     FIGS. 11A and 11B are diagrams of another exemplary mounting region of a printed circuit board that is configured to connect with an apparatus for coupling electronic components provided in accordance with a preferred embodiment of the present invention 
     FIGS. 12A and 12B are diagrams of a strobe unit mounting board that is provided in accordance with another preferred embodiment of the present invention; 
     FIGS. 13A and 13B are diagrams of a strobe unit mounting board that is provided in accordance with another preferred embodiment of the present invention; 
     FIGS. 14A and 14B are diagrams of a strobe unit mounting board that is provided in accordance with a preferred embodiment of the present invention; 
     FIG. 15 is a diagram of a strobe unit mounting board that is provided in accordance with another preferred embodiment of the present invention; and 
     FIG. 16 is a diagram of strobe unit mounting board that is provided in accordance with another preferred embodiment of the present invention. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     The present invention is now discussed with reference to the drawing figures that were briefly described above. A discussion of each preferred embodiment of the present invention is followed by a corresponding discussion of its operation. Unless otherwise specified, like parts are referred to with like reference numerals. 
     Each of the preferred embodiments discussed below has been applied to a camera type electronic device. The present invention, however, is not so limited. To the contrary, the present invention may be applied to other electronic devices especially those that include tight or small internal spaces where movement of components is repeatedly carried out. For example, it is possible to apply the present invention to a microscope having an X-Y stage which is movable relative to a microscope body, and to a scanner equipped with a stage which moves relative to a body, etc. 
     With reference to FIGS. 3-6, the same depict a slide-open type camera that includes an apparatus for coupling electronic components therein in accordance with a preferred embodiment of the present invention. In particular, FIGS. 3 and 4 are perspective views of the interior of the camera, and FIGS. 5 and 6 are perspective views of the exterior of the camera. FIG. 4 shows the state in which a slide cover  1  of the camera is closed. When slide cover  1  is moved in a direction corresponding to the double-headed arrow in FIG. 3, photographic or other type imaging operations are possible. When such operations are possible, a viewfinder objective window  4 , AF window  3 , and a lens barrel  5  equipped with the photographic lens  5   a,  are exposed. Accordingly, photography/imaging may be performed by pressing a release button  6 . 
     As shown in FIGS. 4 and 6, when slide cover  1  is closed, viewfinder objective window  4 , AF window  3 , and lens barrel  5  are housed within slide cover  1 , and release button  6  is locked thus preventing photographic/imaging operations. A strobe unit  7  and strobe main capacitor  8  are disposed within slide cover  1 . Strobe unit  7  and strobe main capacitor  8  are fixed within slide cover  1 , and move when slide cover  1  moves. 
     Referring now to FIGS. 7 and 8, depicted therein are cross-section diagrams of the camera shown in FIGS. 3-6 as seen from a front side thereof and in open and closed states, respectively. FIG. 7 corresponds to the state shown in FIG. 5, and FIG. 8 corresponds to the state shown in FIG.  6 . Strobe unit  7  is mounted in an upper corner portion of slide cover  1  and includes a light emission window. Strobe main capacitor  8  is mounted in a lower corner portion of slide cover  1 . Strobe unit  7  and strobe main capacitor are connected to each other via lead wires (not shown). Notch portions  2   a  and  2   b  are formed in slide cover  1  to permit placement of strobe unit  7  and strobe main capacitor  8  when the slide cover  1  is closed. That is, strobe unit  7  is fitted into the notch portion  2   a  and strobe main capacitor  8  is fitted into the notch portion  2   b  when slide cover  1  is closed. 
     Referring again to FIG. 3, strobe unit  7  is connected to control circuitry within camera body  2  via an FPC  9   b  which has been provided in accordance with the present invention. FPC  9   b  is connected, for example, to strobe unit  7  via an aperture  7   b  thereof and to control circuitry within camera body  2  via an aperture  2   c  thereof. In particular, FPC  9   b  is connected through aperture  2   c  to a main mounting/printed circuit board  10  (see FIGS. 7 and 8 at phantom lines). As shown in FIG. 8 when slide cover  1  is closed, FPC  9   b  is in a retracted and, possibly, a fully retracted state. When in such a fully retracted state, FPC  9   b  may be said to be maintained within a single plane. 
     Referring now to FIG. 9A, depicted therein is a diagram of a strobe mounting board  9  used in conjunction with strobe unit  7 . Strobe mounting board  9  includes a strobe mounting unit  9   a  and an FPC portion  9   b  provided in accordance with a preferred embodiment of the present invention. Strobe mounting portion  9   a  includes plural mounting components  9   c,  and is fixed within the strobe unit  7 . FPC  9   b  is used to connect the strobe mounting unit  9   a  within the strobe unit  7  and the main mounting board  10  (see FIGS. 7 and 8) which is disposed in the interior of camera body  2 . A land portion  9   d  is disposed at an end section of FPC  9   b  in order to connect the main mounting board  10  via a solder bridge, for example. 
     FPC  9   b,  as shown in FIG. 9B, has an obliquely shaded portion cut out of the connection portion region  19   b.  As a result, as shown in FIG. 9B, straight portions  9   b   1  and  9   b   3  terminate at a bending portion  9   b   2 . In between straight portions  9   b   1  and  9   b   3  is cut-away portion  9   f.  In a closed camera state as shown in FIG. 4, for example, straight portions  9   b   1 ,  9   b   3  of FPC  9   b  and bending portion  9   b   2  are retracted to rest in about or in the same plane, and FPC  9   b  is housed in the gap between the end surface  2   d  of camera body  2  and the inner surface of the slide cover  1 . On the other hand, in an opened state as shown in FIG. 1, for example, straight portion  9   b   3  of FPC  9   b  is pulled and extended toward camera body  1  while bending portion  9   b   2  respectively deforms and extends toward strobe unit  7  and straight portion  9   b   1  extends toward camera body  2 . Accordingly, stresses are concentrated at stress concentration portion  9   e  (FIG. 9A) as a result of a twisting action instead of a folding action that causes stress to actual printed circuit board elements/traces on FPC  9   b.    
     In comparison to the structures shown in FIGS. 2A and 2B as described above, for example, bending portion  9   b   2  is deformed by twisting. As a result, even if slide cover  1  is opened and closed a relatively large number of times, risk of breaks and the like due to stress and the like are minimized. As such, durability of FPC  9   b  can be increased. Moreover, as straight portions  9   b   1  and  9   b   3  are in about or in the same plane when slide cover  1  is in a closed state, the thickness of FPC  9   b  can be kept small to about the gap dimension between the end face  2   d  of camera body  2  and the inner surface of slide cover  1 ; that is, the space needed to support or otherwise suspend FPC  9   b  is kept to a minimum. 
     Referring now to FIGS. 10A and 10B, depicted therein are enlarged diagrams of land portions  9   d  of FPC  9   b.  Traces  90  are disposed on FPC  9   b.  The arrangement of lands  9   d  as in FIG. 10A is used in the case that, as shown in FIG. 10B, the main mounting board  10  is located horizontally (perpendicular with respect to a lengthwise direction on FPC  9   b ). Lands  10   d  are lands on printed board  10  which are configured to make contact with lands  9   d.  Because printed circuit board  10  of the camera is generally arranged perpendicularly (see FIG.  11 B), lands  9   d  are located along a lengthwise direction of FPC  9   b,  as shown in FIG.  11 A. As shown in FIG. 11B, a connection of the printed circuit board  10  with FPC  9   b  results when the surface of lands  9   d  of FPC  9   b  are caused to come into contact at right angles with respect to the surface of the printed circuit board  10 , and the lands  9   d  and lands  10   d  are connected by solder bridges H, for example. The stresses placed upon stress concentration portion  9   e  are larger if the stroke of the slide cover  1  is made larger. That is, the deformation of FPC  9   b  increases in the direction in which the cover moves. 
     Referring now to FIGS. 12A,  12 B,  13 A,  13 B,  14 A, and  14 B, depicted therein are other exemplary embodiments of strobe mounting board  9  and FPC  9   b.  Such FPCs are configured to suit particular spatial needs within electronic devices such as cameras, etc. Furthermore, in FIGS. 12A-14B, the views marked with an “A” depict a flattened or retracted FPC, and the views marked with a “B” depict a corresponding extended FPC. 
     With the strobe mounting board  9  shown in FIGS. 12A and 12B, FPC  9   b  has 3 straight portions  9   b   1 ,  9   b   3 ,  9   b   5 , two bending portions  9   b   2 ,  9   b   4 , and respective cut-out portions  9   f   1 ,  9   f   2  formed between the straight portion  9   b   1  and the straight portion  9   b   3 , and between the straight portion  9   b   3  and the straight portion  9   b   5 . In the case that the deformation of the straight portions  9   b   1 ,  9   b   3 ,  9   b   5  is the same as the deformation of the straight portions  9   b   1 ,  9   b   3  as shown in FIG. 3, the stroke of a camera slide cover unit can be extended by distance L 2  in addition to that shown in FIG. 1 (corresponding to L 1  of FIG.  10 ). Moreover, in the case that the stroke L of slide cover  1  is made equal, the magnitude of the torsion of bending portions  9   b   2 ,  9   b   4  can be smaller, and the durability of FPC  9   b  can be increased. Furthermore, in a closed state of slide cover  1 , because the straight portions  9   b   1 ,  9   b   3 ,  9   b   5 , and the bending portions  9   b   2 ,  9   b   4 , are about in or in the same plane, the dimensions of the housing space (dimension in the direction of movement of the slide cover) can be kept down to about the same degree as the thickness of the FPC connection portion  9   b.    
     Moreover, with the strobe mounting board shown in FIGS. 13A and 13B, FPC  9   b  has three straight portions  9   b   1 ,  9   b   3 ,  9   b   5  and two bending portions  9   b   2 ,  9   b   4 . The shape of cut-out portion  9   f   3  differs from the case of FIGS. 12A and 12B, and the shape of FPC  9   b  is a rectangular/square spiral. An effect similar to that of FPC  9   b  of FIG. 10 can be obtained with this embodiment. 
     With the mounting boards described above with regard to FIGS. 9A,  9 B,  12 A,  12 B,  13 A and  13 B, stress becomes concentrated at the stress concentration portions  9   e  of the bending portions  9   b   2 ,  9   b   4  of FPC  9   b.  Consequently, with the strobe mounting board  9  shown in FIGS. 14A and 14B, on the other hand, the shape of FPC  9   b  is a rounded spiral formed by smooth curves, and stresses are caused to distribute through the whole body forming FPC  9   b  when the same is caused to extend. Additionally, the cut-out portion  9   f   4  is formed in a rounded spiral shape. As such, reliability is increased in relation to breaks and the like. Moreover, FIG. 14A illustrates a case where a slide cover is closed such that FPC  9   b  becomes flattened and the space to accommodate it can be kept small. As shown in FIG. 12B extension and retraction of FPC  9   b  occur in directions which are perpendicular to a component/trace surface thereof. 
     Furthermore, the cut-out portions associated with the embodiments shown in FIGS. 9A,  9 B,  12 A,  12 B,  13 A and  13 B, were formed between straight portions, but as shown in FIG. 15, for example, notch portions  9   g   1 ,  9   g   2  may also be formed without of gaps by instead cutting slits between straight portions  9   b   1 ,  9   b   3 ,  9   b   5 . Moreover, in the embodiment shown in FIG. 15, for example, the shape of FPC  9   b  is a meandering or spiral form, but by making the cut-out shapes  9   f   5 ,  9   f   6  as shown in FIG. 16, the shape can be made more complex. In any case, with one end connected to the strobe mounting unit  9   a  dedicated to the strobe unit, and the other end connected to the main mounting or printed circuit board  10  within camera body  2 , FPC  9   b  forms a single band-shaped connecting member with a shape in the plane of the board. 
     With the above-mentioned embodiments, examples have been described of connections between a main mounting board which is disposed in camera body  2  and strobe unit  7 . The present invention is not so limited. To the contrary, the present invention can be applied to connect other structures within electronic devices. 
     The present invention provides certain benefits not heretofore realized by prior connecting apparatuses. In particular, by means of the present invention as described above and, in particular, because the present invention&#39;s flexible printed board deforms perpendicularly to the board surface when electrical components move, there is no torsion type bending as is case with folding flexible printed boards like those commonly found in the prior art. As a result, stresses realized when electronic components move relative to each other can be reduced, and the durability of such flexible printed boards can be increased. 
     Thus, having fully described the present invention by way of example with reference to the attached drawing figures, it will be readily appreciated that many changes and modifications may be made to the invention and to the embodiments shown and/or described herein without departing from the spirit or scope of the present invention which is defined in and covered by the appended claims.