JP4414852B2 - Digital camera - Google Patents

Description

  The present invention relates to a digital camera provided with a countermeasure against electromagnetic interference (EMI) that may affect other operations.

  In digital circuits, unnecessary electromagnetic waves are radiated inevitably by switching operations of individual elements. This electromagnetic wave as unnecessary radiation may affect the operation of other devices. Specifically, noise is given to other devices. Therefore, it is necessary to provide countermeasures against electromagnetic interference caused by electromagnetic waves. 2. Description of the Related Art Conventionally, as a photographing apparatus, a device in which a superconducting thin film layer is formed on a cover member of an electric circuit / component or an apparatus outer body portion corresponding to a portion of the electric circuit / component (for example, is known) , See Patent Document 1).

Japanese Patent Laid-Open No. 01-264299

  However, recent digital cameras are required to be miniaturized, and accordingly, an electric circuit / component (electric circuit) and a device outer body portion (exterior) corresponding to the circuit / component portion. It is difficult to take countermeasures against electromagnetic interference because the gap between them becomes minute.

  The present invention has been made in view of the above, and an object of the present invention is to provide a digital camera capable of preventing unwanted radiation.

In order to solve the above-described problems and achieve the object, the digital camera according to the first aspect of the present invention moves to a closed state located in front of the photographing lens, while retracted from the front surface of the photographing lens. A lens barrier that moves to the lens barrier, an electric circuit that is arranged so as to be covered with the lens barrier in an open state, and an electromagnetic wave absorber provided in the lens barrier.

According to a second aspect of the present invention, in the digital camera according to the first aspect , the electric circuit is an image processing circuit including an integrated circuit that causes unnecessary radiation, and is on a surface that intersects the optical axis of the photographing lens. It is arranged.

  The digital camera according to the present invention is in an open state by providing an electromagnetic wave absorber with respect to a lens barrier that moves to a closed state located in front of the photographing lens and moves to an open state retracted from the front of the photographing lens. The electric circuit was arranged in a manner covered with a lens barrier. As a result, unnecessary radiation that is about to be emitted from the electric circuit is absorbed by the electromagnetic wave absorber, so that it is possible to prevent unnecessary radiation from affecting the operation of other devices.

  In particular, since the electromagnetic wave absorber is provided for the lens barrier, the electromagnetic wave absorber is provided even if it is difficult to provide the electromagnetic wave absorber between the electric circuit and the camera exterior because the camera itself is downsized. Unwanted radiation can be prevented.

  Exemplary embodiments of a digital camera according to the present invention will be described below in detail with reference to the accompanying drawings. Note that the present invention is not limited to the embodiments.

  1 is a perspective view showing an opened state of a lens barrier according to an embodiment of a digital camera according to the present invention, FIG. 2 is a cross-sectional view of the digital camera shown in FIG. 1, and FIG. 3 is a diagram of the digital camera of the present invention. FIG. 4 is a perspective view showing a closed state of the lens barrier of the digital camera shown in FIG. 1, and FIG. 5 is a perspective view showing a state where the lens barrier of the digital camera shown in FIG. 1 is removed. FIG. 6 is a longitudinal sectional view of the lens barrier.

  As shown in FIGS. 1, 2, and 5, the digital camera in the present embodiment is provided with a lens barrier 51 that is movable with respect to the camera body 1.

  First, the camera body 1 will be described. The camera body 1 has a shooting function of a normal digital camera. As shown in FIG. 2, a photographing lens 10 is disposed almost in the center of the camera body 1. The taking lens 10 is configured by housing a lens 10B in a lens barrel portion 10A. The taking lens 10 is provided so as to be housed in the camera body 1. That is, when the camera body 1 is not photographed (portable), the photographing lens 10 has its lens barrel portion 10A housed in the camera body 1 as shown in FIGS. On the other hand, the photographing lens 10 is not clearly shown in the drawing when the camera body 1 is photographed, but its lens barrel portion 10A projects toward the front side of the camera body 1. At the side of the lens barrel 10A (on the right side in FIG. 2), a lens barrel drive unit 11 made of a motor or the like is disposed. The lens barrel drive unit 11 stores and projects the lens barrel portion 10A. An imaging element (for example, CCD: Charge Coupled Devices) 12 is disposed on the optical axis S of the photographing lens 10 on the rear side of the lens barrel portion 10A.

  Inside the camera body 1, an image processing board 13 constituting an image processing unit is disposed on the left front side when the camera is observed from the front of the camera. On the image processing board 13, an electric circuit which is a high-frequency component is arranged. Specifically, an image processing circuit 13A including an integrated circuit such as an ASIC (Application Specific Integrated Circuit) is disposed on the front surface of the image processing board 13, and an oscillation element 13B and a central processing unit (CPU) are disposed on the rear surface. 13C and a recording medium (memory) 13D are arranged. As described above, the image processing circuit 13 </ b> A is disposed on the front surface of the image processing substrate 13 that is lateral to the photographing lens 10 and intersects the optical axis of the photographing lens 10. A power supply board 14 having a power supply circuit (not shown) for supplying power to the image processing board 13 and the like is disposed on the rear side of the image processing board 13. Further, a battery chamber 15 for accommodating a battery is disposed on the rear side of the power supply substrate 14.

  Inside the camera body 1, a strobe light emitting unit 16 is disposed on the right front side. The strobe light emitting unit 16 is provided outside the front side of the camera body 1. A strobe drive substrate 17 having a drive circuit (not shown) for driving the strobe light emitting unit 16 is disposed on the rear side of the strobe light emitting unit 16. An imaging display body 18 is disposed on the right rear side in the camera body 1. The imaging display body 18 is a liquid crystal display, for example, and is provided outside the rear side of the camera body 1. A display substrate 19 having a display driver 19A is provided on the front side of the imaging display body 18. Further, between the strobe drive substrate 17 and the display substrate 19, an external connection terminal 20 that is exposed on the right side of the camera body 1 is provided on the terminal substrate 21.

  The above-described configuration disposed inside the camera body 1 is controlled by the central processing unit 13C as shown in FIG. 3 when the digital camera is used (photographed). That is, the subject light passing through the photographing lens 10 is sensed by the image sensor 12 and photoelectrically converted as an image signal. The photoelectrically converted image signal is input to the image processing circuit 13A and subjected to A / D conversion processing. The image signal processed by the image processing circuit 13 </ b> A is developed by the display driver 19 </ b> A and is displayed and output by the imaging display 18. On the other hand, the image signal processed by the image processing circuit 13A is electrically recorded by the recording medium 13D. The power is supplied to the central processing unit 13C and the like by turning on the switch 22 provided outside the camera body 1 or the switch 22 that operates according to the opened state of the lens barrier 51.

  By the way, when the image processing circuit 13A is driven and controlled by the central processing unit 13C, an electromagnetic wave is generated as unnecessary radiation. As shown in FIGS. 2 and 4, this unwanted radiation is emitted radially from the portion where the image processing circuit 13 </ b> A is mainly arranged, that is, from the left front side portion of the camera body 1.

  A release button 23 is disposed on the upper surface of the camera body 1 at a position on the left side in FIG.

  As shown in FIG. 5, outside the camera body 1, the central front surface 6 </ b> A where the photographing lens 10 is disposed is in the direction of the optical axis of the photographing lens 10 compared to the front surfaces 6 </ b> B on both sides of the camera body 1. It is slightly recessed on the rear side. When the photographic lens 10 is stored in the camera body 1, the photographic lens 10 is stored in the camera body 1 without protruding forward from the front surface 6 </ b> A at the center.

  As shown in FIG. 5, outside the camera body 1, an upper edge portion of a front surface 6 </ b> B on one side of the camera body 1 (a front surface 6 </ b> B on the left side in FIG. 5) A stepped surface 7 that is continuous with the upper edge portion is formed. In the portion corresponding to the front surface 6A of the central portion, the step surface 7 is formed deeper toward the rear as the recessed portion of the front surface 6A moves backward. Further, on the lower surface of the camera body 1, a step surface 8 that is substantially symmetrical with the step surface 7 is formed on the lower surface. That is, the step surface 8 is continuous over the lower edge portion of the front surface 6B (front surface 6B on the left side in FIG. 5) on one side of the camera body 1 and the lower edge portion of the front surface 6A of the center portion. In the portion corresponding to the front surface 6A in the center, the recessed portion of the front surface 6A is formed deeper toward the rear as the rearward movement is backward.

  A first cam groove 2A and a second cam groove 2B are formed in a portion of the step surface 7 related to the front surface 6A at the center. The first cam groove 2A is formed to extend linearly in a direction (see arrow A in FIG. 5) across the optical axis S of the photographic lens 10 from the left side toward the center in FIG. It is. The second cam groove 2B is bent and connected from the right end (one end) in FIG. 5 of the first cam groove 2A, and the component in the optical axis direction of the photographing lens 10 (see arrow B in FIG. 5). And extending obliquely rearward. That is, the first cam groove 2A and the second cam groove 2B are formed as one continuous cam groove. Further, a pin-shaped cam follower 4 protrudes upward at the right end (the other end) of the first cam groove 2A in FIG.

  A third cam groove 3A that forms a pair with the first cam groove 2A and a fourth cam groove 3B that forms a pair with the second cam groove 2B are formed in the step surface 8 on the front surface 6A at the center. It is. The third cam groove 3A is formed so as to extend linearly in a direction (see arrow A in FIG. 5) across the optical axis S of the photographic lens 10 from the left side toward the center in FIG. It is. The fourth cam groove 3B is bent from the right end (one end) toward the third cam groove 3A in FIG. 5, and is provided continuously in the optical axis direction of the photographing lens 10 (see arrow B in FIG. 5). It is formed to extend obliquely rearward with components. That is, the third cam groove 3A and the fourth cam groove 3B are formed as one continuous cam groove. Further, a pin-shaped cam follower 5 projects downward from the right end (the other end) of the third cam groove 3A in FIG. As described above, the third cam groove 3A and the fourth cam groove 3B are symmetrically arranged with respect to the first cam groove 2A and the second cam groove 2B with the camera body 1 being sandwiched in the vertical direction. .

  Next, the lens barrier 51 will be described. The lens barrier 51 is provided so as to be movable with respect to the camera body 1 as described above, and moves away from the front surface of the photographic lens 10 while moving to a closed state (see FIG. 4) located on the front surface of the photographic lens 10. It moves to the opened state (refer FIG. 1).

  As shown in FIGS. 5 and 6, the lens barrier 51 includes a barrier main body 56 that covers the photographic lens 10, and sliding sections 57 and 58 that extend from the upper and lower portions of the barrier main body 56 to the rear side thereof. Is substantially U-shaped.

  As shown in FIGS. 2 and 6, the rear side surface of the barrier body 56 is provided with a concave portion 56 </ b> A having a bottom surface along the rear side surface. Inside the recess 56A, a sheet-like electromagnetic wave absorber 59 is attached along the rear side surface of the barrier body 56. The electromagnetic wave absorber 59 includes an electromagnetic wave shielding material made of, for example, a magnetic material and a resin. The material of the electromagnetic wave absorber 59 is not limited to the above and may be various. Moreover, the sheet-like thickness of the electromagnetic wave absorber 59 is, for example, about 0.5 mm in the present embodiment. The sheet-like thickness of the electromagnetic wave absorber 59 may be 0.5 mm or less as long as it has an electromagnetic wave shielding effect depending on the material. When the electromagnetic wave absorber 59 is provided on the barrier body 56, the recess 56A prevents the electromagnetic wave absorber 59 from projecting on the surface of the barrier body 56 to increase the thickness of the barrier body 56.

  The inner side surface (lower side surface) of the sliding portion 57 faces the step surface 7 in a state where the lens barrier 51 is assembled to the camera body 1. As shown in FIG. 5, on the inner surface of the sliding portion 57, a fifth cam groove 52A and a sixth cam groove 52B in which the cam follower 4 disposed in the camera body 1 is fitted and slidably contacted, and the first cam groove 2A. In addition, a cam follower 54 that is fitted in sliding contact with the second cam groove 2B is provided.

  The fifth cam groove 52A is formed as a straight guide groove extending linearly from the right side to the left side of the lens barrier 51 in FIG. The length of the fifth cam groove 52A corresponds to the amount of movement of the lens barrier 51 in the direction of arrow A, and is the same length as the first cam groove 2A. The sixth cam groove 52 </ b> B is formed by being bent obliquely from the left end (one end) toward the front side of the camera body 1 in FIG. 5 of the fifth cam groove 52 </ b> A. The sixth cam groove 52 </ b> B is formed in parallel with the second cam groove 2 </ b> B disposed in the camera body 1 in the state in which the lens barrier 51 is assembled to the camera body 1 and has the same length. That is, the fifth cam groove 52A and the sixth cam groove 52B are formed as one continuous cam groove. The cam follower 54 protrudes downward at the right end (the other end) of the fifth cam groove 52A in FIG.

  The inner side surface (upper side surface) of the sliding portion 58 faces the step surface 8 in a state where the lens barrier 51 is assembled to the camera body 1. As shown in FIG. 5, on the inner surface of the sliding portion 58, a seventh cam groove 53A and an eighth cam groove 53B in which the cam follower 5 disposed in the camera body 1 is fitted and slidably contacted, and the third cam groove 3A. In addition, a cam follower 55 that is fitted in sliding contact with the fourth cam groove 3B is provided.

  The seventh cam groove 53A is formed as a linear guide groove that extends linearly from the right side to the left side of the lens barrier 51 in FIG. The length of the seventh cam groove 53A corresponds to the amount of movement of the lens barrier 51 in the direction of arrow A, and is the same length as the third cam groove 3A. The eighth cam groove 53 </ b> B is continuously provided by being bent obliquely from the left end (one end) toward the front side of the camera body 1 in FIG. 5 of the seventh cam groove 53 </ b> A. The eighth cam groove 53 </ b> B is formed in parallel with the fourth cam groove 3 </ b> B disposed in the camera body 1 in the state where the lens barrier 51 is assembled to the camera body 1 and has the same length. That is, the seventh cam groove 53A and the eighth cam groove 53B are formed as one continuous cam groove. The cam follower 55 protrudes upward at the right end (the other end) of the seventh cam groove 53A in FIG. As described above, the seventh cam groove 53A and the eighth cam groove 53B are symmetrically disposed with respect to the fifth cam groove 52A and the sixth cam groove 52B with the barrier main body 56 sandwiched therebetween in the vertical direction. .

  The lens barrier 51 is made of, for example, a synthetic resin material and has elasticity. When the lens barrier 51 is assembled to the camera body 1 as shown in FIGS. 1, 2, and 4, the sliding portions 57 and 58 are opened to connect the cam follower 54 and the cam follower 55 to the first cam groove of the camera body 1. 2A and the third cam groove 3A are respectively engaged, and the cam follower 4 and the cam follower 5 of the camera body 1 are respectively engaged with the fifth cam groove 52A and the seventh cam groove 53A.

  Although not clearly shown in the drawing, a hooking portion that assists the sliding of the lens barrier 51 is formed on the front surface of the lens barrier 51. The hooking portion preferably has an uneven shape.

  Hereinafter, the operation of the lens barrier 51 will be described. 7 is a plan view showing the lens barrier closed state, FIGS. 8 and 9 are plan views showing the lens barrier opening process, and FIG. 10 is a plan view showing the lens barrier open state.

  After the lens barrier 51 is assembled to the camera body 1, when the lens barrier 51 is closed as shown in FIG. 7, the lens barrier 51 is positioned in front of the photographing lens 10 and covers the photographing lens 10. . At this time, the cam follower 54 provided in the lens barrier 51 is positioned at the tip of the second cam groove 2B provided in the camera body 1, and the cam follower 4 provided in the camera body 1 is provided in the sixth cam groove 52B provided in the lens barrier 51. Located at the tip of the. On the other hand, the cam follower 55 provided in the lens barrier 51 is positioned at the tip of the fourth cam groove 3B provided in the camera body 1, and the cam follower 5 provided in the camera body 1 is provided in the eighth cam groove 53B provided in the lens barrier 51. Located at the tip. In the closed state of the lens barrier 51, the front surface of the lens barrier 51 is substantially flush with the front surfaces 6 </ b> B on both sides of the camera body 1.

  When using (photographing) the digital camera, the operator applies a force toward the left side to open the lens barrier 51 from the closed state of the lens barrier 51. Then, as shown in FIG. 8, the cam follower 54 of the lens barrier 51 includes an optical axis S direction (see arrow B) and a direction crossing the optical axis S (see arrow A) along the second cam groove 2B. Move in the direction. At the same time, the cam follower 4 of the camera body 1 is relative to the oblique direction including the optical axis S direction (see arrow B) and the direction crossing the optical axis S (see arrow A) along the sixth cam groove 52B of the lens barrier 51. Move on. On the other hand, similarly, the cam follower 55 of the lens barrier 51 moves along the fourth cam groove 3B, and at the same time, the cam follower 5 of the camera body 1 relatively moves along the eighth cam groove 53B. Thereby, the lens barrier 51 moves in the opening direction (left side) while moving in front of the camera body 1.

  The operator applies a force to move the lens barrier 51 further to the left than the state shown in FIG. Then, as shown in FIG. 9, the cam follower 54 moves in the direction of arrow A along the first cam groove 2A, and the cam follower 4 relatively moves in the direction of arrow A along the fifth cam groove 52A. On the other hand, the cam follower 55 similarly moves in the direction of arrow A along the third cam groove 3A, and the cam follower 5 relatively moves in the direction of arrow A along the seventh cam groove 53A.

  The lens barrier 51 is further moved to the left side. Then, as shown in FIG. 10, the cam follower 54 and the cam follower 4 are in contact with each other, while the cam follower 55 and the cam follower 5 are in contact with each other, so that the lens barrier 51 is retracted from the front surface of the photographing lens 10.

  When the lens barrier 51 is closed from the opened state when the digital camera is carried (not photographed), the operator applies a force to move the lens barrier 51 toward the right side. Then, the lens barrier 51 moves as shown in FIGS. 9 to 8, and finally reaches the closed state shown in FIG.

  In the opened state of the lens barrier 51, the lens barrier 51 covers the front surface 6B on one side (left side) of the camera body 1 as shown in FIGS. Inside the front surface 6B of the camera body 1, as shown in FIG. 2, an image processing board 13 having an image processing circuit 13A as an electric circuit is disposed on the front surface. That is, the electromagnetic wave absorber 59 provided in the lens barrier 51 mainly covers the front surface of the image processing circuit 13A. As described above, when the image processing circuit 13A is driven and controlled by the central processing unit 13C when using (photographing) the digital camera, an electromagnetic wave is generated as unnecessary radiation, and the unnecessary radiation is disposed in the camera in which the image processing circuit 13A is arranged. It is going to be emitted radially from the left front side portion of the main body 1 to the outside. However, since the electromagnetic wave absorber 59 covers the left front side portion of the camera body 1, the electromagnetic wave absorber 59 absorbs the electromagnetic wave. Release is prevented.

  Further, even when electromagnetic waves as unnecessary radiation are emitted mainly from the outside of the front surface of the camera body 1 to the image processing circuit 13A, the electromagnetic waves are absorbed by the electromagnetic wave absorber 59, so that the electromagnetic waves enter the inside of the camera body 1. Is blocked.

  Therefore, in the digital camera described above, electromagnetic waves are applied to the lens barrier 51 that moves to the closed state that is positioned in front of the photographing lens 10 during non-photographing and moves to the open state that is retracted from the front of the photographing lens 10 during photographing. An absorber 59 is provided, and an electric circuit (especially the image processing circuit 13A including an integrated circuit) that causes unnecessary radiation is disposed in a mode of being covered with the lens barrier 51 in the opened state. As a result, since the electromagnetic wave absorber 59 absorbs electromagnetic waves as unnecessary radiation that is about to be emitted to the outside of the camera body 1, it is possible to prevent unwanted radiation from affecting the operation of other devices. become. In addition, not only unwanted radiation from the electric circuit but also unwanted radiation from the wiring pattern on the electrical substrate (mainly the image processing substrate 13) can be expected to be sufficiently effective.

  Further, even when electromagnetic waves as unwanted radiation are emitted from the outside of the front surface of the camera body 1 mainly to the image processing circuit 13A, the electromagnetic waves are absorbed by the electromagnetic wave absorber 59. It is possible to prevent a situation in which one's own operation is hindered by blocking the entry of external electromagnetic waves.

  In particular, since the electromagnetic wave absorber 59 is provided for the lens barrier 51, the camera body 1 is miniaturized and the gap between the image processing circuit 13A and the exterior of the camera body 1 is very small, so Even if it is difficult to provide an absorber, an electromagnetic wave absorber 59 can be provided using a gap for moving the lens barrier 51 to prevent unwanted radiation. That is, it is not necessary to change the design of the camera body 1 according to unnecessary radiation.

  In the above-described embodiment, the mode in which the lens barrier 51 moves outside the front surface of the camera body 1 has been described. Although not clearly shown in the figure, for example, an electromagnetic wave absorber 59 may be provided for a lens barrier that moves inside the front surface of the camera body 1.

FIG. 3 is a perspective view showing an open state of a lens barrier according to an embodiment of the digital camera of the present invention. It is a cross-sectional view of the digital camera shown in FIG. It is a block diagram which shows the imaging | photography function of the digital camera of this invention. It is a perspective view which shows the closed state of the lens barrier of the digital camera shown in FIG. It is a perspective view which shows the state which removed the lens barrier of the digital camera shown in FIG. It is a longitudinal cross-sectional view of a lens barrier. It is a top view which shows the closed state of a lens barrier. It is a top view which shows the opening process of a lens barrier. It is a top view which shows the opening process of a lens barrier. It is a top view which shows the open state of a lens barrier.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Camera body 2A 1st cam groove 2B 2nd cam groove 3A 3rd cam groove 3B 4th cam groove 4 Cam follower 5 Cam follower 6A, 6B Front surface 7 Step surface 8 Step surface 10 Shooting lens 10B Lens 10A Lens tube part 11 Tube drive Section 12 Image sensor 13 Image processing board 13A Image processing circuit (integrated circuit)
13B Oscillator 13C Central processing unit 13D Recording medium 14 Power supply board 15 Battery compartment 16 Strobe light emitting part 17 Strobe drive board 18 Imaging display 19 Display board 19A Display driver 20 External connection terminal 21 Terminal board 22 Switch 23 Release button 51 Lens barrier 52A 5th cam groove 52B 6th cam groove 53A 7th cam groove 53B 8th cam groove 54 Cam follower 55 Cam follower 56 Barrier body 56A Recessed part 57, 58 Slide part 59 Electromagnetic wave absorber S Optical axis

Claims (2)

In a digital camera comprising a photographic lens and an image sensor that is provided on the optical axis of the photographic lens and photoelectrically converts subject light via the photographic lens,
When the surface of the camera body of the digital camera that is crossed with the optical axis of the photographic lens is located on the front surface side of the digital camera and is located on the side of the photographic lens, and is driven by using the digital camera An electric circuit including an integrated circuit that emits electromagnetic waves to the outside of the digital camera;
The camera body is disposed on the surface of the camera body so as to be movable along the surface on which the photographic lens is exposed, and is in a closed state positioned on the front surface of the photographic lens, and from the front surface of the photographic lens when the electric circuit is driven. A lens barrier that retracts to the electric circuit side and takes an open state that covers the front surface of the electric circuit ;
An electromagnetic wave absorber provided on the lens barrier and absorbing the electromagnetic wave;
A digital camera characterized by comprising The digital camera according to claim 1, wherein the electric circuit is an image processing circuit .

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