Abstract:
A split mechanism for a coaxial photographing device, especially a split mechanism between a photographing unit and a light projection unit of a photographing device used for a full-time surveillance to facilitate an image adjustment or maintenance, uses primarily the photographing unit as a base of support, with the removable light projection unit being assembled coaxially at an image taking end. After the light projection unit is disassembled and changes a position, it can be linked at a constant direction temporarily and can keep operating by using a linking device which is split linearly, such that a calibration light wave needed for adjusting the images can be provided, and the light projection unit can be easily aligned with an axis to be assembled at position upon assembling.

Description:
BACKGROUND OF THE INVENTION 
       [0001]    a) Field of the Invention 
         [0002]    The present invention relates to a split mechanism for a coaxial photographing device, and more particular to a split, assembly and disassembly mechanism between a photographing unit and a light projection unit of a photographing device used for a full-time surveillance. 
         [0003]    b) Description of the Prior Art 
         [0004]    A coaxial photographing device is used in a surveillance system, wherein an auxiliary light source is provided in a night projection to serve as a photographing device for a fulltime surveillance, with an optic axis along which images are coming into the device same as an optic axis along which light is projecting. 
         [0005]    Referring to  FIG. 9 , a photographing device  9  includes primarily a light projection module  92  which is coaxially attached with a photographing module  91  with a same optic axis S, wherein lens  910  is transfixed through a central throughhole  95  of the light projection module  92  to be attached coaxially. For the conventional photographing device  9 , the photographing module  91  is coaxially attached with the light projection module  92  and is enclosed by a serially connected housing  90 , with an end being connected to an electric wire  97  which provides an electronic driving device  93  with operating power and signal transmission. The electronic driving device  93  is connected to a lead wire  950 , an end of which is linked to a pull terminal  921 , with the light projection module  92  being provided with the operating power through an electric wire  920   
         [0006]    An exterior of the light projection module  92  is protected by a lens  922 , and the light projection module  92  is serial LED dices which are arranged on a surface of a circuit board  923  The circuit board  923  is also provided with a through-hole for transfixing the lens  910 , and the photographing module  91  is provided at a rear end in an interior of the serially connected housing  90 , with a front end of the photographing module  91  being coaxially assembled with the light projection module  92 . 
         [0007]    As the photographing device  9  is used fulltime, images should be adjusted on-site before using. In addition, as the photographing device  9  is put up in high sky to look down on a ground, implementation personnel should climb high to adjust. 
         [0008]    In order to adjust the photographing module  91  for acquiring the correct images, optic parameters should be adjusted through an adjustment key  96  according to an optic condition of the site. If the photographing device operates in daylight environment, then only a value of sensitivity or focus required for the images in the daylight environment can be acquired through the adjustment with the adjustment key  96 . However, the adjustment value is not in compliance with a nighttime auxiliary light source, as in particular, invisible infrared is emitted by the light projection module  92  at the nighttime to prevent to visible light from affecting people, events and objects. Therefore, the image adjustment value of the photographing device  91  is based on the daylight condition, and when at the nighttime that only the infrared is emitted, the images will be distorted or blurred from various conditions due to difference in wavelength. On the other hands if the infrared is used as a calibration base for adjustment, then the photographing device can be applied in the daylight. Accordingly, in principle, the wavelength of the infrared should be used as the calibration base for the operation of the photographing module  91 . 
         [0009]    For the calibration with the infrared, the adjustment should be implemented at dark, and hence, the auxiliary light should be needed to maintain the operation, and the optic axis should be at least parallel to or project in a same direction to an area of photographing 
         [0010]    As the conventional design is an assembly of a single unit, when the adjustment key  96  of the photographing device  91  needs to be adjusted, the light projection module  92  should be disassembled, and the electric wire  920  should be unplugged from the pull terminal  921  therefore the light projection module  92  is separated but is also scattered. During this time, other extension wire will be used to transmit the power of the pull terminal to the light projection module  92  as illumination energy. 
         [0011]    As the light projection module  92  is scattered after being disassembled, the optic axis should be held by another hand of an adjustment person or by a second person, allowing a light beam of the light projection module  92  to irradiate to the required photographing area, such that after that photographing area has been irradiated by the infrared, the optic parameters of the adjustment key  96  can be adjusted. 
         [0012]    The conventional photographing device is provided with following shortcomings:
       1. As the light projection module will be scattered after being disassembled by the high sky operation, it will result in a danger.   2. As two adjustment persons are usually required to operate at a same time, a manpower loading and a danger of high sky cooperation will be increased.   3. Upon reassembling after adjustment, a rim of the through-hole of the light projection module will hit the lens, which may allow the lens to be shifted or damaged.   4. If the exterior of the device is further protected by a protection lens, then an interior surface of the protection lens will reflect a scattered wave of the infrared to enter into the lens, thereby affecting the photographing condition of the lens.   5. When adjusting, as the auxiliary light is held by a bare hand, a swinging will be resulted. If the object to be photographed is there-dimensional, then reflection brilliance is at a left, right, upper or lower side of the object will be changed due to the swinging, allowing the adjustment work to be lengthy and repetitive, which is one of major obstacles in the adjustment operation. Therefore, the adjustment work will take a substantial percentage in installation cost.       
 
       SUMMARY OF THE INVENTION 
       [0018]    The primary object of the present invention is to provide a split mechanism for a coaxial photographing device which facilitates calibration and maintenance, wherein an axial straight splitting can be formed between a photographing unit and a light projection unit, through a linking device that operates linearly. After splitting, the light projection unit can be offset from the axis, keep at a mechanical connection with the photographing unit, and maintain a full operation. In addition the light projection unit can emit a light beam which is parallel to an image wave of the photographing unit, to provide an image adjustment operation aided by an infrared of a same orientation. 
         [0019]    A second object of the present invention is to provide a split mechanism for a coaxial photographing device, wherein upon splitting, the light projection unit and the photographing unit can be safely abutted through a head-on device; or upon disassembling, the light projection unit will not hit the lens through guiding and sectioning of the head-on device. 
         [0020]    A third object of the present invention is to provide a split mechanism for a coaxial photographing device, wherein upon disassembling the light projection unit, it will not result in the danger when the light projection unit is scattered. 
         [0021]    A fourth object of the present invention is to provide split a mechanism for a coaxial photographing device, wherein the light projection unit is fully disassembled to yield an operational space, so as to facilitate exchanging the lens. 
         [0022]    A fifth object of the present invention is to provide a split mechanism for a coaxial photographing device, wherein an outer end of the lens can be formed with an optophysical protection tube to prevent an unnecessary light wave from-n interfering with computation of an automatic shutter, and to form a back pressure function for preventing dust from staining on an optic surface. 
         [0023]    A sixth object of the present invention is to provide a split mechanism for a coaxial photographing device, wherein the light projection unit is provided with a directional heat dissipation device, so as to dissipate waste heat rapidly. 
         [0024]    A seventh object of the present invention is to provide a split mechanism for a coaxial photographing device, wherein the light projection unit and the photographing unit are locked by an annular locking element that a water-proofing function is provided and the photographing device can be further sealed effectively to be used in water. 
         [0025]    To enable a further understanding of the said objectives and the technological methods of the invention herein, the brief description of the drawings below is followed by the detailed description of the preferred embodiments. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS  
         [0026]      FIG. 1  shows a cutaway view of a split mechanism for a coaxial photographing device after being assembled. 
           [0027]      FIG. 2  shows a schematic view of split mechanism for a coaxial photographing device after being split. 
           [0028]      FIG. 3  shows a front view of a split mechanism for a coaxial photographing device wherein a position is changed after a light projection unit has been split. 
           [0029]      FIG. 4  shows a front view of a split mechanist for a coaxial photographing device wherein a position of a light projection unit is changed, after the split mechanism has been split 
           [0030]      FIG. 5  shows a side view of a split mechanism for a coaxial photographing device wherein a position is changed after the split mechanism has been disassembled. 
           [0031]      FIG. 6  shows a schematic view of implementing a head-on device of a split mechanism for a coaxial photographing device. 
           [0032]      FIG. 7  shows a schematic view of  FIG. 6 , wherein parts have been split. 
           [0033]      FIG. 8  shows a schematic view of  FIG. 7  after a position of a light projection unit has been changed, when the split mechanism is disassembled. 
           [0034]      FIG. 9  shows a structure test diagram of a conventional photographing device. 
       
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS  
       [0035]    Referring to  FIG. 1 , a photographing device  1  is constituted primarily by a photographing unit  2  which is coaxially assembled with a light projection unit  3  (the definition of co-axis is that an axis of an image wave is overlapped with an axis of a light beam emitted from the light projection unit  3 ). The photographing unit  2  is enclosed by a cup-shape housing  21 , an interior of which is installed with a photographing module  200  that is linked indirectly with the cup-shape housing  21  through a substrate  22 , and is provided with an electronic driving device  25  that instructs an electric operation of the photographing module  200  and a light emitting module  300 . The electronic driving device  25  conducts electricity and a two-way signal through a cable from a connection hole  29 , and an exterior is provided with a linking par  28  which is assembled on a bracket (not shown in the drawing) by any fixing method. 
         [0036]    The light projection unit  3  is assembled by a cylindrical housing  31 , with an operation end providing an assembly for the light emitting module  300  through a bottom plate  310 . The light emitting module  300  is constituted by a serial-type LED, the photographing unit  2  is assembled and disassembled with the light projection unit  3  using a locking element  5 , and a linking device  4  which operates linearly is provided between the photographing unit  2  and the light projection unit  3 , in parallel with an optic axis. The linking device  4  can operate retractably and a lens  23  of the photographing module  200  conducts out an image wave through an optic through-hole  33  opened at a breadth center of the light emitting module  300 . 
         [0037]    Referring to  FIG. 2 , an axial splitting can be formed between the photographing unit  2  and the light projection unit  3  of the photographing device  1 , through the linear operation of the linking device  4  which is transfixed straightly to a guiding element  41  by a shuttle element  42 . The guiding element  41  and the shuttle element  42  are sheathed together in a tube shape, with an interior of the tube being formed as a loop  400  for transfixing an electric wire  30  which conducts electricity between the light projection unit  3  and the electronic driving device  25 . 
         [0038]    A split length of the linking device  4  is L 3  and that length L 3  should meet with a protruded length L 1  of the lens  23  out of the cup-shape housing  21 . If the linking device  4  is a tube, then it will rotate against its center line. Therefore, as shown in  FIG. 3  and  FIG. 4 , the light projection unit  3  will rotate against the center line of the linking device  4 , and will be exposed out of the lens  23  after rotating. In addition, the light projection unit  3  will keep connecting to illuminate by the electric wire  30  (as shown in  FIG. 5 ), and an adjustment key  250  will be exposed by a change of position of the light projection unit  3 , such that the adjustment can be performed in an infrared site. On the other hand, upon assembling, the light projection unit  3  will rotate reversely, and the optic through-hole  33  of the light projection unit  3  can keep aligning with the axis of the lens  23  for joining. 
         [0039]    Referring to  FIG. 2 , the light projection unit  3  is enclosed by the cylindrical housing  31 , and interior of which is formed with a receiving length L 2  which should be larger than the protruded length L 1  of the lens  23 . Accordingly, during a splitting process, when the light projection unit  3  rotates against the linking device  4 , a port  301  of the light projection unit  3  will not hit the lens  23 . 
         [0040]    A limiting point where the linking device  4  can be pulled out is positioned by limiting elements  411 ,  421  provided by the shuttle element  42  and the guiding element  41 . An end of the guiding element  41  is assembled at the substrate  22  of the photographing unit  2 , and an end of the shuttle element  42  is assembled at the bottom plate  310  of the light projection unit  3  such that by the retractable linking, the light projection unit  3  can keep connecting to the photographing unit  2  mechanically through the linking device  4 , after splitting the light projection unit  3 . 
         [0041]    Referring to  FIG. 5 , the light projection unit  3  is linked through the linking device  4  using the photographing unit  2  as a base of support. As shown in the drawing, after splitting, the light projection unit  3  drops down from a position change. and the electric wire  30  provided by the light projection unit  3  passes through the loop  400  of the linking device  4  and energizes the electronic driving device  25 . Therefore, the light projection unit  3  acquires the driving electricity to emit the light beam after being disassembled, with the optic axis S 2  being parallel with the optic axis S 1  due to the linking device  4 , and a projection surface being perpendicular to the linking device  4  Upon adjusting, as the light projection unit  3  operates synchronously and an optic axis of resulted infrared is parallel with the light projection unit  3 , a necessary adjustment of a light wave in a same orientation and a calibration wave can be obtained at a same time, with the adjustment operation being conducted by the adjustment key  250  of the photographing nodule  200 . 
         [0042]    Referring to  FIG. 6 , a head-on device  8  is further provided at a side parallel to the linking device  4  and the head-on device  8 , similar to the linking device  4 , is provided with a head-on pillar  81  and a head-on through-tube  82 . The head-on pillar  81  and the head-on through-tube  82  are linked respectively to the substrate  22  of the photographing unit  2  and the bottom plate  310  of the light projection unit  3 , and are stretched coaxially in a straight line. 
         [0043]    Referring to  FIG. 7 , the linking device  4  is used as a base of splitting, enabling the light projection unit  3  to split with the photographing unit  2 . The head-on device  8  can have two functions; a first one is to keep the port  301  of the light projection unit  3  from hitting the lens  23  while splitting and before deflecting and changing position, and a second one is to prevent from any mechanical interference to the lens  23  while abutting and pushing the light projection unit  3  by precisely aligning the head-on device  8  with the axis of the light projection unit  3 , upon assembling. 
         [0044]    A length of the head-on pillar  81  is a little longer than the protruded length of the lens  23 , and a length of the head-on through-tube  82  matches a length of the head-on pillar  81 . Therefore, after splitting the linking device  4 , a separation point P of the head-on through-tube  82  and the head-on pillar  81  will cross over an) end surface  230  of the tens  23 . Accordingly, during the process that the position of the light projection unit  3  is changed axially, the port  301  of the tight projection unit  3  will not hit the lens  23 , to keep safety of the lens  23 . 
         [0045]    Referring to  FIG. 8 , when a port of the head-on through-tube  82  of the head-on device  8  is escaped from the separation point P, the light projection unit  3  will deflect with the linking device  4  as a center; at that time the position of light projection unit  3  with be changed downward and the light projection unit  3  will keep illuminating simultaneously. At this time, the optic axis S 2  is parallel with the optic axis S 1  of the lens  23 , an irradiation surface of the light projection unit  3  can be roughly overlapped with an image area of the lens  23 , and the adjustment key  250  will be exposed for adjustment. Therefore, the light wave for adjustment will be the infrared and is provided with the same orientation that the adjustment base of a certain lumen and calibration is acquired. 
         [0046]    Referring to  FIG. 1 , the light projection unit  3  is the serial-type light emitting module  300  which is supported by the circuit board  35  and is linked on the bottom plate  310  of the cylindrical housing  31 , with an outer end being maintained by a protection lens  34 . Waste heat generated by the light emitting module  300  can be conducted toward the cylindrical housing  34  through the bottom plate  310 , and the housing  31  is provided with a longitudinal length with a surface being distributed with cooling fins  37 . Therefore, the waste heat generated by the light emitting module  300  is conducted to the cooling fins  37  through the bottom pate  310 , such that the heat can be dissipated in a large area. The light emitting module  300  is made by LED dices, and thus, the waste heat will be generated from electrode pins (not shown in the drawing) of the dices. At a side of the circuit board  35 , opposite to the electrode pins, thermal conductive adhesive  100  can be introduced into a gap between the circuit board  35  and the bottom plate  310  by paving or coating, so as to form a directional heat dissipation. 
         [0047]    A center of the light projection unit  3  is provided with the optic is through-hole  33 , a center point of which is overlapped with an axis of the lens  23 , and which can be surrounded by a protection tube  7 . The protection tube  7  blocks an inner circumferential surface of the optic through-hole  33 , an enclosed shape is formed by the surrounding of the bottom plate  310 , the cylindrical housing  31  and the protection lens  34  to protect the light emitting module  300  without being contaminated by external dust. The protection lens  34  is locked through pressing of a tightening ring  36 , so as to seal the end surfaces of the protection lens  34  and the cylindrical housing  31  In addition, the protection tube  7  can also form a sealing effect between the protection lens  34  and the bottom plate  310 , to effectively enclose the light emitting module  300 . The electric wire  30  of the light emitting module  300  energizes the electronic driving device  25  through the transfixing of the hollow loop  400  of the linking device  4 , and after being sealed, the light emitting module  300  provides the light projection unit  3  with the independent sealing and enclosing, whether being assembled or disassembled. 
         [0048]    A bottom of the protection tube  7  can be provided additionally with an optic lens  6  which provides an internal space of the entire device to be sealed completely after assembling the light projection unit  3  and the photographing unit  2 , enabling an interior of the photographing device  1  to have effects of water-proofing and dust-proofing. 
         [0049]    The optic lens  6  is attached on the end surface  230  of the lens  23 , hence a light wave coming into the lens  23  will be closest to the optic lens  6 , to prevent a reflection wave on an inner surface of the optic lens  6  from affecting the optic condition for taking the images. On the other hand, an inner space formed by the protection tube  7  and the optic lens  6  will be provided with a back pressure function, preventing the dust which is drifting outside from entering easily to stain a line of vision of the lens  23 . 
         [0050]    The protection tube  7  is provided with a longitudinal length to block an unnecessary slant light wave W with respect to the lens  23  without affecting a sensitizing operation of the lens  23 . The unnecessary light wave W is generated from a slant traveling light of a car or a slant light of sunset, and is not a light wave of a target of photographing. If the unnecessary light wave enters, then a computation value of an automatic aperture or automatic shutter will be affected to result in a distortion of the image. In principle, the actual image wave for photographing as required by the lens  23  is the light wave of the image area, and other slant light waves are not needed. Therefore, by using the length of the protection tube  7 , the slant light wave can be blocked from entering into the lens  23 . 
         [0051]    A pulling assembly is formed between the photographing unit  2  and the light projection unit  3  through the locking element  5 . Referring to  FIG. 2 , it shows an implementation of the locking element  5 , wherein an opposite end of the light projection unit  3  is provided with a thread  350 , and an opposite end of the photographing unit  2  is provided with a pressing part  27 . If the locking element  5  is an annular-shape locking ring  51 , with an end being slidingly cutting an opposite surface of the pressing part  27 , and an inner surface being locked with the thread  350 , then the photographing unit  2  and the tight projection unit  3  can be locked and joined by rotating, through the locking operation of the locking ring  51 . The locking and joining by rotating can provide for a bare hand operation at an outer rim of the locking ring  51 , without requiring an assistance of other tools. 
         [0052]    For a gap of each aforementioned assembly of elements, such as the light emitting module  300  of the light projection unit  3 , the protection lens  34  is locked by the tightening ring  36 ; and then a circumference of the protection lens  34  facing the cylindrical housing  31  is sheathed with an ordinary elastic leak-proof O-ring  52  (as shown in  FIG. 1 ) to form a sealing effect by the elastic reaction force upon being compressed, thereby providing the photographing device  1  to be used in a high-pressure condition, such as deep water. 
         [0053]    Referring to  FIG. 5 , the lens  23  is assembled by rotating through the substrate  22  or the assembly part  221  of the photographing module  200 . When the light projection unit  3  changes a position to yield, an operational room will be resulted, and the lens  23  will be exposed. Therefore by the bare hand operation, the lens  23  can be assembled or disassembled through the assembly part  221 , thus allowing the lens of a different condition to be exchanged easily. 
         [0054]    Referring to  FIG. 2 , the waste heat resulted from the electronic driving device  25  of the photographing unit  2  is distributed to the cup-shape housing  21  by radiation or the implementation of the thermal conductive adhesive  100 , and the outer side of the cup-shape housing  21  can be formed with the cooling fins  26  to enlarge the heat dissipation area. As the outer sides of the photographing unit  2  and the light projection unit  3  are all provided with the cooling fins  26 ,  37 , by a concavo-convex shape of the fins, an intensity of the housing can be enhanced, so as to facilitate using in the high-pressure condition. Certainly, the exposed protection lens  34  also needs a capability to sustain with the high pressure. 
         [0055]    It is of course to be understood that the embodiments described herein is merely illustrative of the principles of the invention and that a wide variety of modifications thereto may be effected by persons skilled in the art without departing from the spirit and scope of the invention as set forth in the following claims.