Abstract:
Provided are shutter eyeglasses that can have simplified internal wiring. The shutter glasses include: a circuit board to which a drive circuit adapted to drive a left eye shutter and a right eye shutter is mounted; a battery adapted to supply power to the circuit board; and a reception element adapted to receive a synchronizing signal transmitted from an image display device. The circuit board, battery, and reception element are arranged between the left eye shutter and the right eye shutter.

Description:
TECHNICAL FIELD  
       [0001]    The present invention relates to shutter eyeglasses used, for example, to view three-dimensional (3D) images using the frame sequential technology. 
       BACKGROUND ART  
       [0002]    In order to view a 3D image displayed using the frame sequential technology, it has been common to use liquid crystal shutter eyeglasses adapted to drive the left and right eye shutters in synchronism with such a 3D image. This type of shutter eyeglasses includes a photoreception element adapted to receive a synchronizing signal from an image display device. 
       CITATION LIST  
     Patent Literature  
       [0003]    [PTL1] 
         [0004]    JP 2011-71757A 
       SUMMARY   
       [0005]    Many of the frames of the shutter eyeglasses have wall-shaped shield sections, one on the right end and another on the left end, to prevent undesired external light from reaching the eyes of the user. With conventional shutter eyeglasses, a circuit board having a drive circuit adapted to drive the two shutters is accommodated in one of the shield sections, and a battery adapted to supply power to the circuit board is accommodated in the other shield section. This layout leads to the need to provide electric conductors along the upper or lower edges of the shutters to connect the circuit board and shutters, the circuit board and photoreception element and the circuit board and battery, resulting in a complicated structure of shutter eyeglasses. 
         [0006]    In one mode of the present invention, shutter eyeglasses have left and right eye shutters and open or close the shutters in synchronism with an image displayed on an image display device. The shutter eyeglasses include a circuit board, battery and reception element. The circuit board has a drive circuit adapted to drive the left and right eye shutters. The battery supplies power to the circuit board. The reception element receives a synchronizing signal from the image display device. The circuit board, battery and reception element are arranged between the left and right eye shutters. This layout provides simpler wiring in the shutter eyeglasses. 
     
    
     
       BRIEF DESCRIPTION OF DRAWINGS  
         [0007]    [ FIG. 1 ] 
           [0008]      FIG. 1  is a perspective view of shutter eyeglasses according to an embodiment of the present invention. 
           [0009]    [ FIG. 2 ] 
           [0010]      FIG. 2  is an exploded perspective view of the shutter eyeglasses. 
           [0011]    [ FIG. 3 ] 
           [0012]      FIG. 3  is a rear view of the shutter eyeglasses. 
           [0013]    [ FIG. 4 ] 
           [0014]      FIG. 4  is a cross-sectional view along line IV-IV shown in  FIG. 3 . 
           [0015]    [ FIG. 5 ] 
           [0016]      FIG. 5  is a cross-sectional view of the shutter eyeglasses having a plane represented by line V-V as a cutting plane. 
           [0017]    [ FIG. 6 ] 
           [0018]      FIG. 6  is a perspective view illustrating an image display device as seen from the front. 
           [0019]    [ FIG. 7 ] 
           [0020]      FIG. 7  is a perspective view illustrating the image display device as seen from the rear. 
           [0021]    [ FIG. 8 ] 
           [0022]      FIG. 8  is an exploded perspective view illustrating the connection relationship between a main body section, base and support of the image display device. 
       
    
    
     DESCRIPTION OF EMBODIMENTS  
       [0023]    A description will be given below of an embodiment of the present invention with reference to the accompanying drawings.  FIG. 1  is a perspective view of shutter eyeglasses  1  according to an embodiment of the present invention.  FIG. 2  is an exploded perspective view of the shutter eyeglasses  1 .  FIG. 3  is a rear view of a bridge D of the shutter eyeglasses  1 .  FIG. 4  is a cross-sectional view along line IV-IV shown in  FIG. 3 .  FIG. 5  is a cross-sectional view of the shutter eyeglasses  1  having a plane represented by line V-V as a cutting plane. In the description given below, the directions represented by X 1  and X 2  in  FIG. 1  are respectively left and right, and those represented by Z 1  and Z 2  are respectively up and down. Further, the direction represented by Y 1  and Y 2  in  FIG. 1  are respectively front and rear. 
         [0024]    As illustrated in  FIG. 1 , the shutter eyeglasses  1  have right and left eye shutters  2 R and  2 L. Liquid crystal shutters, for example, can be used as the shutters  2 R and  2 L. The shutter eyeglasses  1  open or close the shutters  2 R and  2 L in synchronism with an image displayed, for example, on an image display device  100  (refer to  FIG. 6 ) which will be described later. That is, the shutter eyeglasses  1  drive the liquid crystal of the shutters  2 R and  2 L in synchronism with an image displayed on the image display device  100 , thus permitting or restricting the passage of light. If the image display device  100  displays a 3D image using the frame sequential technology, the shutter eyeglasses  1  open the shutters  2 R and  2 L alternately to match the timings at which the right and left eye images are displayed. On the other hand, if the image display device  100  displays different images for a plurality of users using the frame sequential technology, the shutter eyeglasses  1  open both of the shutters  2 R and  2 L to match the timing at which an image for the user using the shutter eyeglasses  1  is displayed. A detailed description will be given later of the image display device  100 . 
         [0025]    As illustrated in  FIG. 1 , the shutter eyeglasses  1  have a frame  3  adapted to hold the shutters  2 R and  2 L. The frame  3  has openings  36  on the right and left side portions, with the shutters  2 R and  2 L held respectively inside the openings  36 . Further, the frame  3  has a visor-shaped upper shield section  33  that overhangs rearward from the upper edge of the shutters  2 R and  2 L. Still further, the frame  3  has, on the left and right end portions, wall-shaped side shield sections  35 , each extending from the edge of the shutter  2 R or  2 L. These upper shield section  33  and side shield sections  35  block undesired external light when the shutter eyeglasses  1  are used. Still further, the frame  3  has a lower bar section  37  adapted to support the lower edges of the shutters  2 R and  2 L. 
         [0026]    As illustrated in  FIG. 2 , the frame  3  in this example has front and rear frames  3 A and  3 B that are assembled together longitudinally. A lug is formed on the edge of the rear frame  3 B to catch on the front frame  3 A, allowing the lug to fasten the front and rear frames  3 A and  3 B together. With the front and rear frames  3 A and  3 B assembled together, the rear frame  3 B is arranged on the inside of the front frame  3 A. That is, the front and rear frames  3 A and  3 B have an outer wall section  33 A and inner wall section  33 B, respectively. The outer wall section  33 A forms the outer face of the upper shield section  33 . The inner wall section  33 B forms the inner face of the upper shield section  33 . A plurality of ribs  33   a  are formed on the upper face of the inner wall section  33 B to secure the strength of the upper shield section  33 . Further, the front and rear frames  3 A and  3 B have an outer wall section  35 A and inner wall section  35 B, respectively. The outer wall section  35 A forms the outer face of the side shield section  35 . The inner wall section  35 B forms the inner face of the side shield section  35 . Still further, openings  36 A and  36 B are formed respectively in the front and rear frames  3 A and  3 B, allowing the outer perimeter edges of the shutters  2 R and  2 L to be sandwiched between and held by the edges of the openings  36 A and  36 B. 
         [0027]    As illustrated in  FIG. 1 , the shutter eyeglasses  1  have side arms  4  each extending rearward from one of the side shield sections  35  of the frame  3 . The side arms  4  are supported by the ears of the user when the shutter eyeglasses  1  are used. The front end of each of the side arms  4  is supported by one of the side shield sections  35 . In this example, the front end of each of the side arms  4  is supported through a pin  41  (refer to  FIG. 2 ) held by one of the side shield sections  35 . Each of the left and right side arms  4  can be folded inward around the pin  41 . 
         [0028]    As illustrated in  FIGS. 2 and 4 , the shutter eyeglasses  1  include a circuit board  5 , battery  12  and reception element  7 . The circuit board  5  has a drive circuit (microprocessor)  51  adapted to drive the shutters  2 R and  2 L. The battery  12  supplies power to the circuit board  5 . The reception element  7  receives a synchronizing signal from the image display device  100 . A photoreception element adapted to detect infrared radiation transmitted as a synchronizing signal from the image display device  100  can be used, for example, as the reception element  7 . 
         [0029]    As illustrated in  FIGS. 3 and 4 , the circuit board  5 , battery  12  and reception element  7  are arranged between the two shutters  2 R and  2 L. That is, the frame  3  has a hollow bridge D (refer to  FIG. 1 ) provided between the shutters  2 R and  2 L, with the circuit board  5 , battery  12  and reception element  7  arranged inside the bridge D. This layout brings the center of gravity of the shutter eyeglasses  1  closer to a horizontal center C 1  of the shutter eyeglasses  1 , thus providing comfort to the user wearing the shutter eyeglasses  1 . Further, this layout provides simpler wiring in the shutter eyeglasses  1 . That is, electric conductors  21  (refer to  FIG. 2 ) adapted to connect the circuit board  5  and shutters  2 R and  2 L can be shortened. Each of the electric conductors  21  in this example extends from the inner portion of the left or right shutter  2 R or  2 L, i.e., the portion closer to the horizontal center C 1 , to the circuit board  5 . Further, this layout provides a shorter electric conductor  12   a  (refer to  FIG. 2 ) adapted to connect the battery  12  and circuit board  5 . Still further, the reception element  7  and circuit board  5  can be readily electrically connected. In this example, the reception element  7  is installed to the circuit board  5  in such a manner as to protrude forward from the circuit board  5 . 
         [0030]    The battery in this example is in the form of a thin rectangular parallelepiped (refer to  FIG. 2 ). As illustrated in  FIG. 4 , the circuit board  5  and battery  12  are arranged in such a manner that their normals are oriented in the same direction to the shutters  2 R and  2 L. That is, the normals are oriented forward. The circuit board  5  and battery  12  are longitudinally side by side. This layout makes it easier to strike a horizontal weight balance of the shutter eyeglasses  1 . That is, it is easier to bring the center of gravity of the shutter eyeglasses  1  close to the horizontal center C 1  of the shutter eyeglasses  1 . Preferably, the horizontal center of the circuit board  5  and that of the battery  12  should match the horizontal center C 1  of the shutter eyeglasses  1 . 
         [0031]    As illustrated in  FIG. 4 , the battery  12  is located rearward of the circuit board  5 . This layout allows the battery  12  to be located closer to the user when the shutter eyeglasses  1  are used, thus ensuring stability in supporting the shutter eyeglasses  1  with the nose and eyes of the user. 
         [0032]    On the other hand, the drive circuit  51  is located on the rear side of the circuit board  5  as illustrated in  FIG. 4 . That is, the drive circuit  51  is installed on the face of the circuit board  5  facing the battery  12 . This layout makes it easier to arrange the circuit board  5  on the front side of the bridge D, thus contributing to higher optical detection sensitivity of the reception element  7 . It should be noted that, as illustrated in  FIGS. 2 and 4 , a sheet-shaped shock absorbing member  15  is arranged between the drive circuit  51  and battery  12 . 
         [0033]    The shutter eyeglasses  1  further have a nose pad  11  (refer to  FIGS. 2 and 3 ) supported by the nose of the user when used. As illustrated in  FIG. 4 , the battery  12  is arranged above the nose pad  11 , with the rear face of the battery  12  located more rearward than a front face  11   a  of the nose pad  11 . The nose pad  11  in this example is approximately U-shaped and open downward. The battery  12  is located above the uppermost portion of the nose pad  11 . This layout of the battery  12  allows the load of the battery  12  to act vertically on the user&#39;s nose via the nose pad  11 , thus providing further improved stability in supporting the shutter eyeglasses  1 . 
         [0034]    As illustrated in  FIG. 4 , the rear frame  3 B has, at the horizontal center portion, a rear lower wall section  32  adapted to define the bottom face of the space formed inside the bridge D. The rear lower wall section  32  is formed in such a manner as to be concave forward relative to a rear cover  13  which will be described later and have an L-shaped cross-section. The upper portion of the nose pad  11  is arranged inside the rear lower wall section  32  (inside the L shape) and attached to the rear lower wall section  32  by screws  17  (refer to  FIG. 2 ). The battery  12  is located above the rear lower wall section  32 . 
         [0035]    The nose pad  11  in this example is formed with an elastic material such as elastomer. Further, the nose pad  11  has a core material  11   b  arranged inside the elastic material as illustrated in  FIG. 4 . The core material  11   b  is formed with a material that can be plastically deformed by the user such as wire. The user can deform the nose pad  11  to fit his or her nose. 
         [0036]    As illustrated in  FIGS. 2 and 4 , the shutter eyeglasses  1  have a rear cover  13  adapted to cover the rear side of the battery  12 . The same cover  13  defines the rear face of the bridge D. The battery  12  is located at the rearmost position of the space formed inside the bridge D and is in contact with the rear cover  13 . In this example, the battery  12  is biased toward the circuit board  5  by the rear cover  13 . 
         [0037]    As illustrated in  FIG. 2 , the circuit board  5  and rear cover  13  are shaped to fit each other. The circuit board  5  and rear cover  13  are fastened to the frame  3  by common screws  9  (refer to  FIG. 3 ). The circuit board  5  and rear cover  13  in this example are formed in such a manner that their horizontal widths increase gradually from bottom to top. Holes are formed, one at left and another at right, in the upper portions of the circuit board  5  and rear cover  13 . The screws  9  are inserted into these holes. 
         [0038]    The lower edge of the rear lower wall section  32  of the rear frame  3 B is bent in such a manner as to be open downward as seen from the front as with the noise pad  11  described above. As illustrated in  FIG. 4 , a flange section  38  is formed in the lower edge of the rear lower wall section  32  to protrude forward. Further, the front frame  3 A has, at the horizontal center portion, a front lower wall section  39  adapted to form the bottom face of the bridge D together with the flange section  38 . The flange section  38  and front lower wall section  39  are also bent in such a manner as to be open downward. The circuit board  5  is located more forward than the rear lower wall section  32  described above, with the lower edge thereof located lower than the lower edge of the battery  12 . The lower edge of the circuit board  5  is bent to fit the flange section  38  and front lower wall section  39 . This makes it possible to increase the size of the circuit board  5  than if the same board  5  is rectangular. Bosses  39   a  (refer to  FIG. 4 ) are formed in the front frame  3 A. The two screws  17  are respectively inserted into the bosses  39   a  to fasten the nose pad  11 . The lower edge of the circuit board  5  is supported by the bosses  39   a,  thus ensuring stable support of the circuit board  5 . 
         [0039]    The battery  12  in this example is a secondary battery. As illustrated in  FIG. 2 , the shutter eyeglasses  1  have a connector  52  to which electric conductors can be connected to charge the battery  12 . A USB-standard connector can be, for example, used as the connector  52 . The connector  52  is located between the right and left shutters  2 R and  2 L. In this example, the connector  52  is installed to the circuit board  5 , thus eliminating the need for an electric conductor between the connector  52  and circuit board  5 . The connector  52  is arranged in such a manner as to be open upward. An opening  33   b  is formed in the upper shield section  33  of the frame  3  (more specifically, the outer wall section  33 A of the front frame  3 A) to expose the connector  52 . The opening  33   b  is closed by a connector cover  8  (refer to  FIG. 1 ). 
         [0040]    As illustrated in  FIG. 1 , the shutter eyeglasses  1  have a power button  14  located closer to the horizontal center C 1  than the right and left shutters  2 R and  2 L. The power button  14  is provided on the upper shield section  33 . By providing the power button  14  at this position, it is possible for the user to power on or off the shutter eyeglasses  1  while wearing the shutter eyeglasses  1 . As illustrated in  FIG. 2 , a switch  53  is installed to the circuit board  5 . Located below the power button  14 , the switch  53  is switched on or off in response to the pressing of the power button  14 . With the shutter eyeglasses  1  assembled, the power button  14 , switch  53  and connector  52  are horizontally side by side. 
         [0041]    A light source (more specifically, LED)  54  is further installed to the circuit board  5  to notify the user of the operating status of the shutter eyeglasses  1 . The light source  54  is arranged next to the switch  53 . A light source cover  18  is provided in the upper shield section  33  (more specifically, the outer wall section  33 A of the front frame  3 A) to cover the light source  54  as illustrated in  FIG. 1 . The same cover  18  is formed with a light transmitting material. 
         [0042]    As illustrated in  FIGS. 2 and 4 , the front frame  3 A has, at the horizontal center portion, a front wall section  31  adapted to define the front side of the space formed inside the bridge D. A hole  31   a  is formed in the front wall section  31 . The hole  31   a  is located on the front side of the reception element  7 . A synchronizing signal transmitted from the image display device  100  enters the reception element  7  through the hole  31   a.    
         [0043]    As has been described so far, all the electrical components (the circuit board  5  and installed components  51 ,  52 ,  53  and  54 , battery  12  and reception element  7  described above) of the shutter eyeglasses  1  are arranged between the right and left shutters  2 R and  2 L. Therefore, no electric conductors are provided in the side shield sections  35 , upper shield section  33  or lower bar section  37 . As described above, the upper shield section  33  includes the outer wall section  33 A of the front frame  3 A and the inner wall section  33 B of the rear frame  3 B. In this example, no electric conductors are provided in the upper shield section  33 . This makes it easy to form ribs  33   a  between the inner wall section  33 B and outer wall section  33 A making up the upper shield section  33  so as to secure the strength of the upper shield section  33 , thus contributing to improved strength of the same section  33 . As illustrated in  FIG. 2 , the ribs  33   a  are formed from the rear edge to the front edge of the inner wall section  33 B. The plurality of ribs  33   a  are arranged horizontally side by side at equal intervals. Further, as described above, the side shield sections  35  includes the outer wall section  35 A of the front frame  3 A and the inner wall section  35 B of the rear frame  3 B. No components are arranged inside the outer wall section  35 A and inner wall section  35 B, making these sections hollow. This contributes to a reduced load on the user&#39;s ears when the shutter eyeglasses  1  are worn. 
         [0044]    As illustrated in  FIG. 4 , the shutter eyeglasses  1  include a front cover  16  arranged on the front side of the circuit board  5  and battery  12 . The same cover  16  is attached to the front face of the front wall section  31  provided at the center portion of the front frame  3 A. The front cover  16  is shaped to fit the front wall section  31 , closing the hole  31   a  formed on the front side of the reception element  7 . The front cover  16  is formed with a light transmitting material so that light from the image display device  100  enters the reception element  7  through the front cover  16  and hole  31   a.    
         [0045]    As illustrated in  FIG. 5 , the front cover  16  is arranged to be flush with the right and left shutters  2 R and  2 L. That is, the right-side portion of the front cover  16  is approximately flush with the right eye shutter  2 R, and the left-side portion of the front cover  16  is approximately flush with the left eye shutter  2 L. This structure makes it less likely that an external force will act on the front wall section  31  forming the bridge D than the structure in which the front cover  16  is located more forward than the shutters  2 R and  2 L. This prevents a load from being exerted on the electrical components accommodated in the bridge D. 
         [0046]    As illustrated in  FIGS. 2 and 5 , the rear frame  3 B has inner wall sections  34  forming the side faces of the bridge D. Each of the inner wall sections  34  is formed along an inner edge  2   a  of one of the right and left shutters  2 R and  2 L. Front edges  34   a  of the inner wall sections  34  are located rearward of and in contact with the edges  2   a  of the shutters  2 R and  2 L. This structure restricts the rearward movement of the edges  2   a,  thus properly maintaining the positional relationship between the front cover  16  and the edges  2   a  of the shutters  2 R and  2 L. That is, the shutters  2 R and  2 L are maintained flush with the front cover  16 . 
         [0047]    As described above, the rear frame  3 B has the flange section  38  that protrudes forward from the lower edge of the rear lower wall section  32 . The front frame  3 A has the front lower wall section  39  that is formed on the lower edge of the front wall section  31 . The space inside the bridge D is formed as a closed space by the inner wall sections  34 , rear lower wall section  32  and flange section  38  of the rear frame  3 B, the front wall section  31  and front lower wall section  39  of the front frame  3 A, and the rear cover  13 . The components accommodated in the bridge D are protected by these wall sections, cover and flange section. 
         [0048]    A description will be given here of the image display device  100 .  FIGS. 6 and 7  are perspective views illustrating the appearance of the image display device  100 .  FIG. 6  illustrates the image display device  100  as seen from the front, and  FIG. 7  illustrates the same device  100  as seen from the rear. As illustrated in these figures, the image display device  100  includes a main body section  110 , base  120  and support  130 . 
         [0049]    The main body section  110  is the main body of the image display device  100  and includes a display screen  111  adapted to display an image on the front face. Further, a status display indicator  112 , power indicator  113  and speakers  114  adapted to play audio are arranged respectively at the bottom center, at the bottom left, and at the left and right of the display screen  111  on the front face of the main body section  110 . The status display indicator  112  and power indicator  113  are used to show the operating status of the image display device  100 . 
         [0050]    A plurality of input/output terminals  115  are provided on the rear face of the main body section  110  to exchange signals with external equipment (e.g., home gaming machine). More specifically, the image display device  100  includes input terminals adapted to input image signals such as image signals compliant with the HDMI (High-Definition Multimedia Interface) standard and component image signal. Further, the same device  100  may include output terminals adapted to output audio or other signals to external equipment. 
         [0051]    A plurality of operation buttons  116  including a power button are arranged on the rear face of the main body section  110 . These operation buttons  116  are used, for example, to change various settings of the image display device  100  and adjust the display thereof. 
         [0052]    The main body section  110 , base  120  and support  130  are detachable from each other.  FIG. 8  is an exploded perspective view illustrating the connection relationship therebetween. The support  130  is screwed from the bottom of the base  120 , thus fastening the support  130  to the base  120 . Further, a hollow connection section  117  is arranged on the rear face of the main body section  110 . A hole  118  is formed in the connection section  117 . On the other hand, an insertion section  131  having a protruding portion  132  is arranged at the upper portion of the support  130 . This protruding portion  132  can be pushed in and is biased in the direction of protrusion from the insertion section  131 . When the insertion section  131  of the support  130  is inserted into the connection section  117 , the protruding portion  132  engages with the hole  118 , thus fastening the main body section  110  to the support  130 . When the main body section  110  is raised upward while at the same time pushing in the protruding portion  132  with the main body section  110  fastened to the support  130 , the main body section  110  can be removed from the support  130 . As described above, the main body section  110  can be manually detached from or attached to the support  130  by the user with ease without using tools. Therefore, the user can, under certain circumstances, detach the main body section  110  from the support  130  and place the same section  110  at a desired location to view an image. It should be noted that, as illustrated in  FIG. 7 , the input/output terminals  115  are arranged on the side face of the main body section  110 . Therefore, even if the main body section  110  is laid on a floor surface with the rear face of the same section  110  placed face down, cables can be connected to the input/output terminals  115 . This allows the user to view an image even when the main body section  110  is laid on a floor surface in such a manner that the display screen  111  is oriented level. 
         [0053]    Further, the image display device  100  supports the frame sequential stereoscopic display. That is, the same device  100  makes up a frame sequential image display system together with the shutter eyeglasses  1 . More specifically, the image display device  100  switches alternately between right and left eye images in a time divided manner for display on the display screen  111 . Further, a transmitter  119  is arranged in the main body section  110  to transmit a synchronizing signal adapted to notify an image switch timing to the appropriate shutter eyeglasses  1 . In response to the synchronizing signal, the shutter eyeglasses  1  close the left eye shutter  2 L while the right eye image is displayed on the display screen  111  and close the right eye shutter  2 R while the left eye image is displayed on the display screen  111 . This allows the user wearing the shutter eyeglasses  1  to view the left eye image with his or her left eye and the right eye image with his or her right eye. 
         [0054]    Further, the image display device  100  allows a plurality of users to view different images using the frame sequential display technology. More specifically, the image display device  100  displays on the display screen  111  one image for a user A and another image for a user B alternately rather than right and left eye images. Further, the transmitter  119  transmits signals adapted to notify an image switch timing to each of the shutter eyeglasses  1  used by the users A and B. In response to the signals, the shutter eyeglasses  1  used by the user A close the shutters  2 R and  2 L for both eyes while the image for the user B is displayed, and opens the shutters  2 R and  2 L for both eyes while the image for the user A is displayed. Conversely, the shutter eyeglasses  1  used by the user B close the shutters  2 R and  2 L for both eyes while the image for the user A is displayed, and opens the shutters  2 R and  2 L for both eyes while the image for the user B is displayed. This allows the two users to view completely different images. 
         [0055]    As described above, the circuit board  5 , battery  12  and reception element  7  are arranged between the left and right eye shutters  2 L and  2 R in the shutter eyeglasses  1 . This layout provides simpler wiring in the shutter eyeglasses  1 . 
         [0056]    Further, in the shutter eyeglasses  1 , the battery  12  and circuit board  5  are longitudinally side by side. This layout makes it easier to strike a horizontal weight balance of the shutter eyeglasses  1 . 
         [0057]    Still further, in the shutter eyeglasses  1 , the battery  12  is located rearward of the circuit board  5 . This layout allows the battery  12 , a component heavier than other components, to be located closer to the user when the shutter eyeglasses  1  are used, thus ensuring stability in supporting the shutter eyeglasses  1  with the nose and ears of the user. 
         [0058]    In the shutter eyeglasses  1 , the battery  12  is arranged above the nose pad  11 . This layout allows the load of the battery  12  to act vertically on the user&#39;s nose via the noise pad  11 , thus providing further improved stability in supporting the shutter eyeglasses  1 . 
         [0059]    Further, in the shutter eyeglasses  1 , the front cover  16  is arranged on the front side of the circuit board  5 , battery  12  and reception element  7  in such a manner as to be flush with the right and left shutters  2 R and  2 L. This structure makes it less likely that an external force will act on the front wall section  31  forming the bridge D than the structure in which the front cover  16  is located more forward than the shutters  2 R and  2 L. This prevents a load from being exerted on the circuit board  5  and other components accommodated in the bridge D. 
         [0060]    Still further, in the shutter eyeglasses  1 , the connector  52  to which electric conductors are connected to charge the battery  12  is also arranged between the left and right eye shutters  2 L and  2 R. This layout provides further simpler wiring in the shutter eyeglasses  1 . 
         [0061]    It should be noted that the present invention is not limited to the shutter eyeglasses  1  and may be modified in various ways. 
         [0062]    For example, the battery  12  and circuit board  5  are longitudinally side by side in the above description. However, the layout of the battery  12  and circuit board  5  is not limited thereto. Instead, they may be arranged horizontally side by side. 
         [0063]    Further, in the above description, the front cover  16  is arranged to be flush with the right and left shutters  2 R and  2 L. However, the front cover  16  may be arranged more forward than the right and left shutters  2 R and  2 L. 
         [0064]    Still further, a primary battery maybe used as the battery  12 . In this case, the connector  52  need not necessarily be provided. Further, in this case, the battery  12  may be replaced by removing the rear cover  13 .