JP2006053195A - Sector device for camera - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sector device for a camera realizing miniaturization with simple structure. <P>SOLUTION: The sector device for a camera 1 opening/closing an aperture 3 formed on a shutter base plate 2 by a sector arranged to freely rock is equipped with 1st sectors 11 and 12 made large enough to cover the aperture 3 when they are at a closing position where they totally close the aperture 3, and 2nd sectors 21 and 22 covering a portion EX of the aperture 3 opened when the 1st sector overruns from the closing position. In the sector device for the camera, the 1st sector is formed to be small by disposing the 2nd sector covering a portion of the aperture opened when the 1st sector overruns. Therefore, the sector device for the camera is formed to be small in size. Since the 2nd sector has only to assist shielding only when the 1st sector overruns, the 2nd sector is formed to be small. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a camera sector device used as a shutter device of a camera. More specifically, the present invention relates to a camera sector device that is formed so as to be closed by a plurality of sectors and is miniaturized.

  In recent years, miniaturization of cameras has been progressing rapidly. Therefore, it is necessary to reduce the size of the shutter device built in the camera. In order to reduce the size of the shutter device, forming a sector (blade) that opens and closes an opening is widely used as one method in the past. For example, Patent Document 1 discloses a shutter device (light-shielding device) having four sectors. This shutter device has two inner blades disposed on the left and right sides of the opening and two outer blades disposed on the outer sides of the inner blades. In this shutter device, the inner blade and the outer blade located on one side of the opening are swung by the operation lever. Further, a biasing spring that biases the outer blade in the opening direction is connected to suppress a bounce phenomenon when the outer blade collides with the stopper on the opening side.

JP-A-8-313969

  However, the sector configuration of the shutter device disclosed in Patent Document 1 is the same as that of a general shutter device in the related art, and the inner blade and the outer blade close the opening to form a closed state. That is, even if the inner blade comes to the closed position where the opening is closed, the opening cannot be completely closed by itself (referred to as fully closed), and a part of the opening remaining on the back side of the inner blade cannot be removed. A fully closed state can be formed only by closing with a blade. And since the inner blade and the outer blade are simultaneously rotated, the load applied to the motor was not changed even if each blade was divided into small blades. For this reason, it has been difficult to increase the shutter speed or save power.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a camera sector device that has a simple structure and is small in size and speeds up the sector and saves power.

  An object of the present invention is to provide a camera sector device that opens and closes an opening formed in a substrate with a sector that is swingably disposed, and the sector is configured to open the opening from the opening position when the opening is closed. A first sector that moves to a closed position; and a second sector that closes the opening with the first sector when the first sector exceeds the closed position during the closing operation of the opening; The second sector has a retracted position retracted from the opening and the opening that closes the opening with the first sector when the first sector exceeds the closing position when the opening is closed. The first sector is moved from the closed position to the entry position in conjunction with the operation of the first sector from the closed position when the first sector exceeds the closed position. Moving camera sector device More is achieved.

  According to the present invention, the first sector can be made smaller by disposing the second sector that covers a part of the opening that opens when the first sector overruns the closed position. Therefore, the sector device for the camera can be formed in a small size. Further, since the second sector only needs to be shielded when the first sector overruns beyond the closed position, the second sector can be made smaller. Therefore, the second sector does not become an obstacle to downsizing the apparatus.

  The second sector closes the opening with the retracted position retracted from the opening and the first sector when the first sector exceeds the closing position when the opening is closed. The first sector is moved from the retracted position to the entry position in conjunction with a closing operation from an intermediate position between the closed position and the open position of the first sector. You may make it move toward.

  In addition, the first sector and the second sector may be linked via an operating member that operates the first sector, and the second sector is connected to the second sector. A biasing member that biases from the entry position toward the retracted position may be provided. The camera sector device can be employed as a camera shutter device or a lens barrier device. Such a camera can be miniaturized.

  As described above, according to the present invention, it is possible to provide a camera sector apparatus that has a simplified structure and is small in size and capable of speeding up the sector and saving power.

  A camera sector device according to an embodiment of the present invention will be described with reference to the drawings. Below, the example at the time of comprising the sector apparatus for cameras of this invention as a shutter apparatus is shown. FIG. 1 is an enlarged view showing the periphery of the opening of the camera shutter device 1 in the fully open position where the sector is retracted from the opening 3. 2 shows when the sector of the camera shutter device 1 enters the opening 3 to the fully closed position, and FIG. 3 shows the fully closed position from the fully closed position where the sector of the camera shutter device 1 enters the opening 3. It is the figure which showed similarly the position when it overruns exceeding. FIG. 4 is a view similarly showing a state when the closing operation of the camera shutter device 1 is finished and the stable shutter position is reached. In these drawings, all sectors of the camera shutter device 1 are shown in the upper part (A), and in the lower part (B), the shape of the sector and the state of the position change are shown on one side of the opening so that it can be easily confirmed. Only certain sectors are shown.

  The shutter device 1 includes a shutter substrate 2 in which an opening 3 for photographing is formed. The shutter device 1 has a total of four sectors (shutter blades), two on the left and right sides with the opening 3 in between. Specifically, the first inner blade 11 and the second inner blade 12 that are the first sector are arranged one by one on the left and right sides with the opening 3 therebetween, and similarly, the second outer blade 21 with the opening 3 in between. And the second outer blade 22 are arranged.

  The said 1st inner blade | wing 11 and the 2nd inner blade | wing 12 are formed in the magnitude | size which can just cover the opening 3 in cooperation in the closed position which forms a fully closed state (refer FIG. 2). . That is, the opening 3 can be closed by the first inner blade 11 and the second inner blade 12. In other words, the opening 3 can be closed by the first sector alone constituted by the first inner blade 11 and the second inner blade 12. The shapes of the inner blades 11 and 12 are designed so that the area protruding from the peripheral portion (area overlapping the substrate 2) is reduced with the opening 3 closed. Specifically, after the first inner blade 11 and the second inner blade 12 have moved from the fully open position (FIG. 1) to the fully closed position (FIG. 2) and then overrun beyond the fully closed position, It is formed so small that a part of the opening 3 is opened (re-exposed) on the back side. Although the relationship between the inner blades 11 and 12 and the outer blades 21 and 22 will be described later, the inner blades 11 and 12 are main sectors that close the opening 3, and the outer blades 21 and 22 when the inner blade 11 overruns. Becomes an auxiliary sector for assisting the shielding of the opening 3.

  The inner blades 11 and 12 are swung by a swing arm 30 as an operating member. Since the 1st inner blade | wing 11 and the 2nd inner blade | wing 12 are the substantially symmetrical arrangement | positioning, the other can be understood similarly by demonstrating the structure for rocking | fluctuating the 1st inner blade | wing 11. FIG. This point will be described with reference to FIG. On the back side of the shutter substrate 2 (the back side in FIG. 1), a motor 5 that can rotate in the forward and reverse directions is disposed. The base of the swing arm 30 is fixed to the rotor shaft 10 of the motor 5, and the tip of the arm rotates within a predetermined range. A driving pin 32 is fixed to the tip portion. The drive pin 32 is engaged in the elongated hole 13 formed in the first inner blade 11. The elongated hole 13 is formed so that the first inner blade 11 swings counterclockwise and moves to a position to close the opening 3 when the drive pin 32 rotates counterclockwise as indicated by an arrow. Yes. Further, the first inner blade 11 is disposed so as to be swingable around the rotor shaft 10 having the same axis. Therefore, when the drive pin 32 rotates counterclockwise, the first inner blade 11 moves to the closed position where the opening 3 is closed.

  The other second inner vane 12 is arranged in the same manner as the first inner vane 11 at a substantially symmetrical position. That is, as shown in FIG. 1A, the second inner blade 12 is swingable about the support shaft 20 and has a long hole 14 formed for swinging. The drive pin 32 is engaged with the elongated hole 14. When the closed state shown in FIG. 2 is formed, the second inner blade 12 approaches from the side opposite to the first inner blade 11 to close the opening 3. Accordingly, the first inner blade 11 and the second inner blade 12 can cooperate to close the opening 3.

  However, as described above, the first inner blade 11 and the second inner blade 12 are formed small enough to shield the opening 3 at the fully closed position where the opening 3 is closed. Inertial force (inertia) acts when the first inner blade 11 and the second inner blade 12 actually swing from the fully open state in FIG. 1 to the fully closed state in FIG. Therefore, the first inner blade 11 and the second inner blade 12 moved to the closed position by the drive pin 32 are overrun in the direction in which the overlapping amount increases (position beyond the fully closed position) as shown in FIG. There is a case. When overrun in this way, a part of the opening 3 is opened on the back side 11a, 12a of each blade, and a re-exposure state is formed. In order to prevent this re-exposure, the camera shutter device 1 includes the first outer blade 21 and the second outer blade 22 described above as shielding auxiliary blades for the opening 3.

  The first outer blade 21 and the second outer blade 22 do not contribute to the shielding of the opening 3 when the camera shutter device 1 is fully closed. The first outer blade 21 and the second outer blade 22 are arranged to prevent re-exposure when the inner blades 11 and 12 overrun as described above. In this respect, the first outer blade 21 and the second outer blade 22 are different in operation and function from the conventional auxiliary sector in which the opening is covered by all sectors in the fully closed state. That is, conventionally, the area covered by the sector is formed to be considerably wider than the opening 3 so as not to be re-exposed even if overrun. For this reason, it is necessary to drive a sector that is larger by that amount, and it has been difficult to increase the speed of the sector and to reduce the driving power. In the type in which the size of each sector is reduced by covering the opening with multiple sectors, all sectors are driven in the process of moving to the fully closed position, so the total weight of the closed sectors is reduced. A similar problem occurs.

  In the present embodiment, the opening 3 can be closed by the first sector alone constituted by the first inner blade 11 and the second inner blade 12. However, as described above, the first inner blade 11. And the 2nd inner blade | wing 12 is formed in the required minimum magnitude | size which covers the opening 3. As shown in FIG. Since only the first inner blade 11 and the second inner blade 12 that are miniaturized to the necessary minimum are driven from the fully open position to the fully closed position, the speed of the blades and power saving can be achieved. When overrun occurs, the opening 3 is covered with the first outer blade 21 and the second outer blade 22 in addition to the first inner blade 11 and the second inner blade 12, so there is no fear of re-exposure.

  Referring to FIG. 1, the first outer blade 21 is rotatable about the same spindle 10 as the first inner blade 11, and the second outer blade 22 is centered on the same spindle 20 as the second inner blade 12. It can rotate freely. The other end of a spring (biasing member) 23 whose one end is locked to the shutter substrate 2 is fixed to the first outer blade 21, and receives a biasing force in a direction of retreating from the opening 3. A contact pin 25 that restricts the movement of the first outer blade 21 from the opening 3 in the retracting direction is provided. The contact pin 25 is erected from the shutter substrate 2. Similarly, the second outer blade 22 receives a biasing force in a direction of retreating from the opening 3 by a spring 24. The contact pin 26 restricts the movement of the second outer blade 22 from the opening 3 in the retracting direction.

  And the 1st outer blade | wing 21 and the 2nd outer blade | wing 22 have a special shape compared with the blade | wing employ | adopted with the conventional shutter apparatus. That is, the first outer blade 21 and the second outer blade 22 are formed narrow. As described above, these outer blades 21 and 22 cover a part of the opening (the portion to be re-exposed) that is overrun when the first inner blade 11 and the second inner blade 12 form a fully closed state. Therefore, it can be formed in such a narrow width.

  The shutter device 1 includes a configuration for reliably preventing re-exposure using the outer blades 21 and 22 when the first outer blade 21 and the second outer blade 22 overrun. When the opening 3 shown in FIG. 1 is fully opened, the drive pin 32 of the swing arm 30 is separated from the outer blades 21 and 22. However, when the opening 3 shown in FIG. 2 is fully closed, the drive pin 32 is set to be in a position where it just contacts the back of the outer blades 21 and 22. Therefore, when the overrun state shown in FIG. 3 is reached, the drive pin 32 further rotates counterclockwise, and the back side 21a, 22a of the outer blades 21, 22 is pushed. That is, in the shutter device 1, the outer blades 21 and 22 do not operate in the region from the fully open to the fully closed inner blades 11 and 12, and the inner blades 11 and 12 are overrun beyond the closed position. Thus, the outer blades 21 and 22 are configured to start moving toward the opening 3 side.

  As described above, the opening 3 can be shielded by the first inner blade 11 and the second inner blade 12, but if overrun, it is formed in a size that cannot be shielded. A part of the opening 3 opens on the back side. At this time, the outer blades 21 and 22 cover the part. FIG. 3 shows a hatched portion EX of the opening 3 that opens on the back side 11a and 12a when the first inner blade 11 and the second inner blade 12 overrun. As described above, the shutter device 1 is formed so that the inner blades 11 and 12 which are shutter blades are small, so that when the inner blades 11 and 12 are overrun, a part of the opening 3 is opened. Since the outer blades 21 and 22 move so as to close the portions in conjunction with the overrun of the blades 11 and 12, there is no problem of re-exposure. The outer blades 21 and 22 need only have an area enough to block a portion EX of the opening 3 that is temporarily opened when the inner blades 11 and 12 are overrun.

  A series of operations of the shutter device 1 having the above configuration will be described with reference to FIG. FIG. 5 is a diagram showing the relationship between the operating angle of the swing arm 30 that swings the inner blades 11 and 12 and the outer blades 21 and 22 and the opening area of the opening 3. FIG. 5 can confirm the closing operation of the inner blades 11 and 12 and the outer blades 21 and 22. FIG. 5A shows the shutter device 1, where (1) shows the operation by the inner blades 11, 12, (2) shows the operation by the outer blades 21, 22, and these are shown as (3) on the right side. Shows the combined operation. In addition, FIG. 5B shown in the lower part shows an operation example of the shutter blades in the conventional shutter device as a comparative example.

  As shown in FIG. 5A, when the swing arm 30 is rotated counterclockwise CWW in the shutter device 1 and the operating angle is changed from A1 to A2, the inner blades 11 and 12 are viewed from the fully opened position in FIG. 2 to the fully closed position. At this time, the outer blades 21 and 22 do not move from the initial position, but the drive pin 32 comes to a position just in contact with the back portions 21a and 22a.

  Since inertial force acts on the first inner blade 11 and the second inner blade 12, the overrun state of FIG. 3 may occur without stopping at the fully closed position shown in FIG. That is, as shown in FIG. 3, the first inner blade 11 and the second inner blade 12 pass (overrun) without stopping at the position where the opening 3 is closed. Therefore, as shown in FIG. 5, the operating angle increases from A2 to A3. Even if the first inner blade 11 and the second inner blade 12 move a little, the opening 3 can be maintained in the fully closed state. However, when the operating angle exceeds A3, a part of the opening 3 is opened.

  However, in the shutter device 1, when the operating angle of the swing arm 30 reaches A <b> 2, the drive pin 32 just contacts the back portions of the first outer blade 21 and the second outer blade 22. This state is a preparation state provided when the first inner blade 11 and the second inner blade 12 are overrun. Then, in parallel with the overrun operation of the inner blades 11 and 12, the shielding assist operation of the outer blades 21 and 22 is started. The first outer blade 21 and the second outer blade 22 are set at a predetermined shielding position at an operating angle A4 that is closer to the operating angle A3 than the operating angle A3 at which the back portions of the first inner blade 11 and the second inner blade 12 open. ing. Therefore, in the present shutter device 1, even if the inner blades 11 and 12 are overrun, the re-exposure state is not achieved. The relationship of the swinging motions of the inner blades 11 and 12 and the outer blades 21 and 22 can be well confirmed by (3) in FIG.

  In addition, when the shutter device 1 is in a state where the inner blades 11 and 12 are overrun, the first outer blade 21 and the second outer blade 22 resist the biasing force of the springs 23 and 24 and the opening 3 Move to the center side. At this time, the drive pin 32 pushes the first outer blade 21 and the second outer blade 22 toward the opening 3, and conversely, a state is formed in which the springs 23 and 24 try to pull back. That is, as shown by (3) in FIG. 5A, the springs 23 and 24 act as the brake BL after the shutter device 1 enters the overrun state. With such a function, the effect that the amount RC overrunning the inner blades 11 and 12 can be reduced can also be obtained.

  Then, after the shutter device 1 enters the overrun state as described above, the shutter device 1 enters the stable fully closed state shown in FIG. 4 and the closing operation is completed. At this time, the small inner blades 11 and 12 cooperate to shield the opening 3 of the shutter substrate 2, and the first outer blade 21 and the second outer blade 22 are in a position retracted from the opening 3. That is, the inner blade 11 and the inner blade 12 can cover the opening 3 to be fully closed.

  For the shutter blade of the shutter device 1 that operates as described above, in the case of the conventional shutter device shown in FIG. 5B, when the operating angle is changed from A1 to A2, The inner blade and the outer blade are moved simultaneously. At this time, since the operating angle exceeds A3, overrun of the inner blade occurs. However, the inner blade and the outer blade are formed large in advance so that re-exposure does not occur even if the inner blade moves past the operating angle A3. Therefore, there is a limit to downsizing the apparatus by forming the blades in a small size.

  As described above, the shutter device 1 has a structure in which the opening 3 is shielded by the inner blades 11 and 12 serving as the first sector. However, these blades are close to the limit that can cover the opening 3. It is formed small. Such a sector can reduce the rocking energy, so that the sector speed can be increased and power can be saved. The portion EX of the opening 3 that opens when overrunning due to downsizing is covered by the outer blades 21 and 22 serving as the second sector, so that the problem of re-exposure does not occur. Since the outer blades 21 and 22 only cover a part of the opening 3 only when the inner blades 11 and 12 are overrun, the outer blades 21 and 22 may be smaller sectors than the inner blades. Can be greatly reduced in size.

  Further, when the outer blades 21 and 22 enter the opening 3 when the inner blades 11 and 12 overrun beyond the closed position of the opening 3, the springs 23 and 24 serving as biasing members function as a brake. To do. Further, since the outer blades 21 and 22 are stationary when the inner blades 11 and 12 are moved from fully open to fully closed, the static frictional force of the outer blades 21 and 22 also functions as a brake. Therefore, the distance over which the inner blades 11 and 12 overrun beyond the closed position of the opening 3 can be suppressed. Further, the shutter device 1 has a simple structure in which when the inner blades 11 and 12 overrun beyond the closed position of the opening 3, the driving pins push the back sides 21 a and 22 a of the outer blades 21 and 22. Since a complicated mechanism for controlling the swinging operation of the four sectors is not required unlike the conventional shutter device, the configuration can be simplified.

  In the embodiment described above, the shutter device including the two inner blades 11 and 12 as the first sector and the two outer blades 21 and 22 as the second sector is illustrated, but as shown in FIGS. A similar effect can be obtained with a single shutter device. Next, another embodiment will be described. However, the same parts as those in the above-described embodiment are denoted by the same reference numerals, and description thereof is omitted. In this other embodiment, the inner blade 111 that is the first sector and the outer blade 211 that is the second sector are each composed of one sheet. FIG. 6 shows a fully open position where the inner blade 111 and the outer blade 211 are retracted from the opening 3. The inner blade 111 is formed in a size that can just cover the opening 3 at the closed position (see FIG. 7) that forms the fully closed state. For this reason, the opening 3 can be closed by the inner blade 111 alone. The outer blade 211 receives a biasing force in a direction of retreating from the opening 3 by the biasing member 23. The movement of the outer blade 211 in the direction of retreating from the opening 3 is restricted by the contact pin 25. When the swing arm 30 is driven counterclockwise from the fully open position of the opening 3 in FIG. 6, the drive pin 32 comes into contact with the back surface portion 211 a of the outer blade 211 when the swing arm 30 is in the closed position. When the inner blade 111 overruns due to inertial force, the drive pin 32 pushes the back surface portion 211a of the outer blade 211 and swings the outer blade 211 into the opening 3 as shown in FIG. For this reason, even if the inner blade 111 overruns beyond the fully closed position of the opening 3 and a portion that cannot be covered on the back side is formed, the outer blade 211 covers that portion, so there is no fear of re-exposure.

  In the above two embodiments, the driving start timing of the outer blade is when the inner blade reaches the fully closed position, but is not limited thereto. The timing for driving the outer blade may be from a position where the driving speed of the inner blade is hardly affected. The outer blade 411 is driven immediately before the inner blade 311 reaches the fully closed position (see FIG. 9A), and thereafter It may be fully closed (see FIG. 9B). However, in this case, since the urging force of the urging member 23 is applied at the fully closed position, a configuration in which the detent torque of the motor (not shown) is increased and the structure is stably stopped at the fully closed position is necessary.

  In the above embodiment, an example in which the sector device is configured as a shutter device has been described, but the present invention is not limited to this. For example, the sector device of the present invention may be employed in a lens barrier device or a diaphragm device that protects a lens barrel of a camera. Further, the movement of the sector is not limited to swinging, and may be moved linearly.

  The preferred embodiment of the present invention has been described in detail above. However, the present invention is not limited to the specific embodiment, and various modifications can be made within the scope of the gist of the present invention described in the claims. Deformation / change is possible.

It is the figure which expanded and showed the opening part periphery of the shutter apparatus for cameras in a full open state. It is the figure which showed the mode when the shutter apparatus for cameras of FIG. 1 will be in a fully closed state. It is the figure which showed a mode when the camera shutter apparatus of FIG. 1 overruns from full closure. It is the figure which showed a mode when the fully-closed operation | movement of the camera shutter apparatus of FIG. 1 was complete | finished, and was in the stable state. It is the figure which showed the relationship between the operating angle of the rocking | fluctuation arm which rock | fluctuates an inner blade | wing and an outer blade | wing, and an opening area. It is the figure which showed the full open state of the other Example. It is the figure which showed the fully closed state of the other Example. It is the figure which showed the state overrun from the fully closed of another Example. It is the figure which showed the operation | movement of the blade | wing which reaches the closed state of other Examples.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Shutter apparatus 2 Shutter board 3 Opening 11 1st inner blade 12 2nd inner blade 21 1st outer blade 22 2nd outer blade 22, 23 Spring 30 Swing arm 32 Drive pin

Claims (6)

A sector device for a camera that opens and closes an opening formed in a substrate by a sector that is swingably disposed,
The sector includes a first sector that moves from the opening position of the opening to the closing position of the opening when the opening is closed, and the first sector that exceeds the closing position during the opening operation of the opening. A second sector that closes the opening with the first sector;
The second sector has a retracted position retracted from the opening and the opening that closes the opening with the first sector when the first sector exceeds the closing position when the opening is closed. The first sector is moved from the closed position to the entry position in conjunction with the operation of the first sector from the closed position when the first sector exceeds the closed position. A sector device for a camera that moves. A sector device for a camera that opens and closes an opening formed in a substrate by a sector that is swingably disposed,
The sector includes a first sector that moves from the opening position of the opening to the closing position of the opening when the opening is closed, and the first sector that exceeds the closing position during the opening operation of the opening. A second sector that closes the opening with the first sector;
The second sector has a retracted position retracted from the opening and the opening that closes the opening with the first sector when the first sector exceeds the closing position when the opening is closed. The first sector moves from the retracted position to the entry position in conjunction with a closing operation from an intermediate position between the closed position and the open position of the first sector. A sector device for a camera. 3. The camera sector device according to claim 1, wherein the first sector has a size capable of closing the opening independently. 4. The camera sector device according to claim 1, wherein the first sector and the second sector are interlocked via an operating member that operates the first sector. 5. 5. The camera sector device according to claim 1, further comprising a biasing member that biases the second sector from the entry position toward the retracted position. 6. A camera comprising the camera sector device according to claim 1.

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