JP2015191092A - Focal-plane shutter for camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a focal-plane shutter for camera improving follow-up performance of a first drive member for front blade and a second drive member for front blade and capable of accurately controlling stroboscopic light emission timing.SOLUTION: A leaf spring 8 is attached to a second drive member 3 for front blade, and a top end part of the leaf spring 8 is detachably disposed to a pin 2d of the first drive member 2 for front blade, and the pin 2d is provided with a brake plate 17 that is in contact with the pin 2d, and a rotary motion of a second drive member 3 for front blade is allowed to be transmitted to the first drive member 2 for front blade via the leaf spring 8. The pin 2d presses the brake plate 17 and brakes the first drive member 2 for front blade before the rotation from a setting position of the first drive member 2 for front blade is completed. Stroboscope contact pieces 16a, 16b are arranged adjacent to the first drive member 2 for front blade so that the stroboscope contact pieces 16a, 16b are closed to each other.

Description

  The present invention relates to a focal plane shutter for a camera that is configured so that exposure of a photosensitive surface is performed by sequentially moving a front blade and a rear blade during shooting, and shooting in an open mode is possible by switching between shooting modes.

  At the time of shooting, the focal plane shutter for cameras, which is configured so that the front and rear blades are sequentially moved to expose the photosensitive surface and the shooting mode can be switched to perform shooting in the open mode, is now well known. (For example, refer to Patent Document 1 below).

  The blade driving device for this type of shutter includes a first driving member having a leading blade driving pin that collides with a buffer member at the end of driving for exposure and stops and is connected to a leading blade support arm; A leading blade driving unit including the first driving member and a second driving member coupled via a spring and rotating integrally; It consists of a rear blade drive unit having a rear blade drive pin connected to the rear blade support arm, and this front blade drive unit is also configured to interlock with the brake mechanism and strobe switch, so that the components The shape and arrangement of the shutter are extremely complicated, and coupled with the demand for downsizing the entire shutter, this is a problem in shutter design.

JP 2011-137986 A

  The present invention has been made in view of such problems, and an object of the present invention is to integrate the first driving member and the second driving member for the leading blade in this type of focal plane shutter for a camera. It is configured so that the dynamic performance is maintained well and the operation of the brake plate for suppressing the closing of the strobe switch and the bounce of the leading blade driving member is performed by a part of the first driving member for the leading blade. Another object of the present invention is to provide a shutter device of this type which can effectively use the shutter space and can accurately control the timing of the strobe light emission.

  In order to achieve the above object, a focal plane shutter for a camera according to the present invention is urged in an exposure operation direction by a first blade first drive member connected to the front blade and a drive spring, and at the time of exposure operation. A leading blade second driving member that rotates with the blade first driving member, a spring that biases the leading blade first driving member and the leading blade second driving member closer to each other, and the leading blade Provided with the first driving member for the leading blade, and a strobe contact member disposed adjacent to the first driving member for the leading blade. It is characterized by that.

  In the focal plane shutter for a camera according to the present invention, the first driving member for the leading blade is provided with a protrusion that can be brought into contact with and separated from the bullet member and can close the strobe contact piece. Features.

  In addition, the focal plane shutter for a camera according to the present invention includes a set member that can move the second blade driving member for the leading blade and the driving member for the trailing blade to a setting completion position, and one end portion thereof can be slidably contacted with the setting member. The other end is provided with a brake member capable of coming into contact with the first drive member for the leading blade.

  Further, the focal plane shutter for a camera according to the present invention is characterized in that the brake member can be brought into contact with the protrusion of the first driving member for the leading blade.

  In the focal plane shutter for a camera according to the present invention, the bullet member and the brake member are leaf springs.

  According to the present invention, when the shutter is charged, the second driving member for the leading blade pushes the first driving member for the leading blade through the elastic member, and the followability of the leading blade support lever is improved. Even if the speed is increased, the leading blade support lever can be operated without delay. Further, the operation of the strobe switch, the action of the elastic member for improving the followability of the first driving member and the second driving member for the leading blade, and the operation of the brake plate of the leading blade driving member are driven by the leading blade. Since the unit can be made of a single member without having a complicated shape, it is advantageous not only in design but also in that it can be effectively used in a narrow shutter space.

It is a principal part top view of the Example of this invention which showed the state at the time of completion | finish of blade | wing driving | running | working in case a shutter was set to the close mode seeing from the to-be-photographed object side. It is the top view which clarified the principal part structure of this invention apparatus corresponding to FIG. It is the perspective view which showed the principal part structure of this invention apparatus. It is a principal part top view at the time of completion of setting operation | movement in case a shutter is set to closed mode. It is a principal part top view which showed the state at the time of leading blade exposure operation | movement in case a shutter is set to closed mode. It is a principal part top view which showed the state of strobe switch-in in case a shutter is set to closed mode. FIG. 2 is a plan view of the main part similar to FIG. 1 when the shutter is set in a normally open mode.

Hereinafter, the present invention will be described based on illustrated embodiments.
FIG. 1 is a plan view showing a main part configuration of an embodiment of the present invention showing a state when blade travel is completed when viewed from the subject side when the shutter is set in a closed mode. The basic configuration of the shutter mechanism is shown in FIG. Since these are well known from Patent Document 1 and the like, they will be described briefly.

  In the figure, reference numeral 1 denotes a ground plate on which an opening for exposure 1a is formed. On the back side of the ground plate 1, that is, on the imaging device side, an intermediate plate and an auxiliary ground plate having openings aligned with the exposure aperture 1a with a predetermined interval. Arranged in sequence, a blade chamber for a leading blade is formed between the intermediate plate and the auxiliary base plate, and a blade chamber for a trailing blade is formed between the ground plate 1 and the intermediate plate, respectively. .

  On the object side surface of the base plate 1, pillars 1b, 1c, 1d, and 1e are erected in the upper left area and lower area in FIG. 1, respectively, and a shaft 1f is erected in the right intermediate area. Yes. Further, the base plate 1 is formed with arc-shaped long holes 1g, 1h centering on the shafts 1b, 1d, and well-known buffer members (not shown) made of rubber or the like are respectively provided at the lower ends thereof. It is attached. In addition, although not shown in figure, the auxiliary | assistant ground plate is also formed with the same shape long hole in the position facing the long holes 1g and 1h.

  The front blade first drive member 2 and the front blade second drive member 3 are rotatably attached to the shaft 1d with the first blade first drive member 2 facing the base plate 1 side. Yes. The first blade driving member 2 has a driven portion 2a, a suppressed portion 2b, and a driving pin 2c at one end, and a pin 2d at the other end. The driven part 2a is a part that is pressed by a pressing part 3d of the second driving member 3 for the leading blade described later. The pushed part 2a has a pushed part 2a, a restrained part 2b, and a drive pin 2c at one end, and a pin 2d at the other end. The pushed portion 2a is a portion that is pushed by the pushing portion 3a of the second blade 3 driving member 3 described later. Further, when the leading blade first drive member 2 tries to turn counterclockwise, the restrained portion 2b engages with the tip of a restraining member 4 that is driven by an electromagnetic actuator described later and rotates. This is the part to be suppressed. Further, the drive pin 2d is inserted into the long hole 1h, the front end portion of the oval-shaped cross section is fitted to the leading blade support arm described later, and the cylindrical base portion is attached to the end portion of the long hole 1h. It can come into contact with a buffer member (not shown).

  The second driving member 3 for the leading blade has a cylindrical portion 3a, a driven portion 3b, a mounting portion 3c formed thick on the subject side, and a pressing portion 3d. The shaft 1d is rotatably fitted. Then, when the shutter is set, the leading blade second driving member 3 is attached to an upper base plate (not shown) provided at a predetermined interval on the front side of the drawing with respect to the base plate 1. A well-known iron piece member 6 that can be attracted to the electromagnet 5 is attached. The second blade driving member 3 is urged to rotate clockwise by a known blade driving spring (not shown).

  Further, a base portion is attached to a shaft 7 erected on the leading blade second driving member 3 on the leading blade second driving member 3, and a leading end bent portion 8 a is disposed on the leading blade first driving member 2. A leaf spring 8 that can be brought into contact with the upper pin 2d is placed and fixed. The leaf spring 8 has an intermediate ring portion 8b fitted into the cylindrical portion 3a, and the distal end bending portion 8a is formed as a free end portion extending from an arm portion protruding in the radial direction from the intermediate ring portion 8b. Has elasticity and steel.

  Reference numerals 9 and 10 denote a pair of leading blade support arms rotatably attached to the shafts 1d and 1i on the back side of the main plate 1, respectively. These leading blade support arms 9 and 10 are directed toward the respective tip portions. For example, three blades are pivotally attached in order, and one of them is a slit forming blade of the leading blade. As is well known, the blade support arm 9 is urged clockwise by a front blade drive spring (not shown), and the blade support arm 10 is counterclockwise by a set spring that is much less elastic than the front blade drive spring. It is biased in the direction and plays the role of a backlash spring for the leading blade. As described above, the drive pin 2 c is fitted to the blade support arm 9. Therefore, the first driving member for leading blades connected to the arm 9 is urged counterclockwise.

  Further, a rear blade drive member 11 is rotatably attached to the shaft 1b. This rear blade drive member 11 is a well-known iron piece member that can be attracted to the drive pin 11a inserted through the long hole 1g and the electromagnet 12 attached to the upper base plate (not shown) when the shutter is set. 11b and a cylindrical protrusion 11c formed on the back surface side are provided. The rear wing drive member 11 is urged to rotate clockwise by a known rear wing drive spring (not shown).

  Reference numerals 13 and 14 denote a pair of rear blade support arms rotatably attached to the shafts 1b and 1j, respectively, on the back side of the main plate 1, and these rear blade support arms 13 and 14 are directed toward the respective front end portions. For example, three blades are pivotally attached in order, and one of them is a slit forming blade of the rear blade. The rear blade support arm 13 is fitted with a drive pin 11a that travels in the long hole 1g.

  Reference numeral 15 denotes a set member rotatably attached to the shaft 1 f, a pushing portion 15 a that can abut against the pushed portion 3 b of the second driving member 3 for the leading blade, and a columnar protrusion of the trailing blade driving member 11. It has a pushing portion 15b that can come into contact with 11c and a brake plate contact portion 15c. The set member 15 is biased so as to be rotated counterclockwise by a spring (not shown), and is configured to be rotated clockwise by a member on the camera side during a photographing operation.

  Reference numeral 16 is attached to the shaft 1e, and is arranged so as to be brought into contact with the pin 2d of the first driving member 2 for the leading blade when the exposure opening 1a is substantially fully opened by the leading blade by the release after setting. This is a strobe contact device having a pair of contact pieces 16a and 16b having an open habit.

  The central portion 17 is rotatably supported by a shaft 18 erected on the base plate 1, the one end bent portion 17 a is in sliding contact with the brake plate contact portion 15 c of the set member 15, and the other end bent portion 17 b is first. This is a belt-like brake plate having moderate elasticity and steel properties disposed so as to be in sliding contact with the pin 2d of the first drive member 2 for blades.

  18 is mounted on the ground plane 1 to switch between the open mode and the close mode, and when the shutter is set to the open mode by the switching operation on the camera side, the tip of the mover 4 is rotated by the portion to be restrained 2b. When the shutter is set to the closed mode, the tip of the mover 4 is restrained when the leading blade is folded and held in a position where the opening 1a for exposure is fully opened. This is an electromagnetic actuator having a well-known structure that operates so as to retreat out of the rotation locus of the portion 2b.

  Next, the operation of this embodiment will be described. The focal plane shutter for a camera of this embodiment starts an exposure operation for photographing when the leading blade starts to open the exposure opening 1a, and the exposure for photographing when the trailing blade finishes closing the opening 1a. Appropriate exposure time determined by a well-known electronic control circuit including an image sensor, in which the first mode (closed mode) for ending the operation and the exposure operation for photographing are started after the exposure aperture 1a is fully opened. During the lapse of time, the camera can be attached to a camera that allows the photographer to select shooting in the second mode (open mode) in which shooting exposure is ended when the rear blade finishes closing the exposure opening 1a. The description of the operation is omitted because it is known as described in, for example, Patent Document 1 and the like, and hereinafter, one cycle of the operation by photographing in the first mode will be described. To reveal the gist.

  FIG. 1 shows a state in which the exposure operation is finished. In this state, when the set member 15 is rotated clockwise by an operation on the camera body side for shutter charging, a pushing portion of the set member 15 is shown. 15a pushes the driven portion 3b of the second driving member 3 for the leading blade and pushes it counterclockwise, so that the second driving member 3 for the leading blade is biased by a leading blade driving spring (not shown). Against this, it is rotated from the position of FIG. 1 to the position of FIG. Following the rotation of the second driving member 3 for the leading blade, the leading blade first driving member 2 is also rotated counterclockwise, and this rotating position is a position where the iron piece member 6 can be attracted and held by the electromagnet 5. It becomes.

  In this case, since the pin 2d is also moved counterclockwise by the counterclockwise rotation of the first blade driving member 2, the strobe contact pieces 16a and 16b are released from the pressing state and are in a non-contact state. Moreover, the brake plate 17 will be in a free state.

  Similarly, in the state of FIG. 1, when the set member 15 is rotated clockwise by an operation on the camera body side for shutter charging, the pushing portion 15 b of the set member 15 becomes the columnar shape of the rear blade drive member 11. The rear blade drive member 11 is slidably contacted with the side wall of the protrusion 11c and rotated counterclockwise to the position shown in FIG. 4, and this rotation position is a position where the iron piece member 11b is attracted and held by the electromagnet 12. .

  After completion of the shutter charging operation, the set member 15 returns to the position shown in FIG. 1 due to its own behavior and stops, and the one-end bent portion 17a of the brake plate 17 contacts the brake plate contact portion 15c of the set member 15. Further, by the above-described rotation of the first blade driving member 2 and the rear blade driving member 11 due to the charging operation, the leading blade enters the exposure opening 1a, while the trailing blade exits from the exposure opening 1a. The leading and trailing blades are stationary as shown in FIG.

  Thus, when the shutter charge operation is completed, the first blade first drive member 2, the second front blade drive member 3, and the rear blade drive member 11 are maintained in the shutter charge state shown in FIG. The exposure operation preparation is complete.

  In this state, when a shutter button (not shown) on the camera side is pressed and released, first, the leading blade electromagnet 5 is demagnetized by a signal from an exposure control circuit (not shown), and the leading blade first 2 The driving member 3 is released and rapidly rotates clockwise with the first blade first driving member 2 to start the exposure operation. This rotational movement is stopped when the drive pin 2c comes into contact with a buffer member (not shown). Due to this movement of the drive pin 2c, the leading blade is lowered while increasing the overlap of the plurality of blades constituting the leading blade, thereby opening the exposure opening 1a. Next, when the appropriate exposure time determined by the exposure control circuit has elapsed, the rear blade electromagnet 12 is demagnetized, the rear blade drive member 11 is released and rapidly rotates clockwise, and the drive pin 11a is rotated. It stops by abutting against a buffer member (not shown). By this movement of the trailing blade driving member 11, the trailing blade is lowered while reducing the overlapping of the plurality of blades constituting the trailing blade, and closes the exposure opening 1a. In this way, the first driving member for the leading blade 2, the second driving member for the leading blade 3, the trailing blade driving member 11, the leading blade and the trailing blade are returned to the positions shown in FIG. End the operation.

  By the way, according to the present invention, the bent end of the leaf spring 8 attached to the leading blade second driving member 3 is applied to the pin 2d erected on the leading blade first driving member 2 during the setting operation. The follow-up of the first drive member 2 for the leading blade with respect to the rotation of the second drive member 3 for the leading blade is made suitable. Further, since the bent portion 17b of the brake plate 17 can be slidably contacted with the pin 2d after the charging is completed and before the exposure operation is started, the first blade 1st drive member 2 is rotated in the clockwise direction. When the leading blade reaches the position (see FIG. 5) immediately before the leading blade completely opens the exposure opening 1a, the pin 2d starts to slide in contact with the bent portion 17b of the brake plate 17, and the leading blade first driving is performed. The member 2 is rapidly decelerated, and the bounce when the drive pin 11a abuts against the buffer member is suppressed by a considerable amount. Further, the bounce at this time is restrained by the bent portion of the tip of the leaf spring 8, and as a result, the drive pin 11 a is buffered by appropriately selecting the spring constant of the brake plate 17 and the leaf spring 8. The bounce when contacting the member is accurately suppressed. Therefore, the leading blade is stably maintained at the position retracted from the exposure opening 1a.

  Further, according to the present invention, the strobe contact device 16 is disposed adjacent to the leading blade driving member, and the leading blade driving member is illustrated when the exposure opening 1a is substantially fully opened by the traveling of the leading blade. When the position shown in FIG. 6 is reached, the strobe contact pieces 16a and 16b are brought into contact with each other by the pin 2d, so that the full opening of the exposure opening 1a and the strobe light emission can be matched easily and reliably. .

  As described above, the pin 2d provided upright on the first drive member 2 for the leading blade has been described as an example of the member that operates the leaf spring 8, the strobe contact pieces 16a and 16b, and the brake plate 17. It may be a bent portion that is erected at the tip of the first drive member for blades and shaped into an appropriate shape.

  When the shutter is used as a normally open type shutter, the electromagnetic actuator 18 is activated by the switching operation on the camera side, and the tip of the movable element 4 is the restrained portion of the first driving member 2 for the leading blade. Even when shutter charging is performed, the driving pin 2c is restrained from being in contact with the buffer member ′, and the leading blade is exposed to the opening 1a as shown in FIG. To keep it in the correct state. In this case, the exposure operation by the rear blade is well known and is not directly related to the gist of the present invention, and thus detailed description is omitted.

DESCRIPTION OF SYMBOLS 1 Shutter base plate 1a Exposure opening 2 First blade first drive member 2c Lead blade drive pin 2d Pin 3 Second blade second drive member 8 Leaf spring 8a Leaf spring tip 15 Shutter set member 16 Strobe contact devices 16a and 16b Strobe contact
17 Brake plate

Claims (5)

A first drive member for the leading blade connected to the leading blade;
A second driving member for leading blades that is biased in the exposure operation direction by a driving spring and rotates with the first driving member for leading blades during the exposure operation;
A spring that biases the leading blade first driving member and the leading blade second driving member closer to each other;
An elastic member provided on the leading blade second driving member and capable of contacting and separating from the leading blade first driving member;
A strobe contact member disposed adjacent to the first drive member for the leading blade;
A focal plane shutter for a camera.   2. The camera for a camera according to claim 1, wherein the first drive member for the leading blade is provided with a protrusion that can contact and separate from the bullet member and can close a strobe contact piece. 3. Focal plane shutter.   A set member capable of moving the second blade driving member for the leading blade and the driving member for the trailing blade to a setting completion position, and one end portion of which is slidable to the set member, and the other end portion is the first driving member for the leading blade The focal plane shutter for a camera according to claim 1, further comprising a brake member capable of abutting on the camera.   4. The focal plane shutter for a camera according to claim 3, wherein the brake member can come into contact with the protrusion of the first driving member for the leading blade. 5.   5. The focal plane shutter for a camera according to claim 1, wherein the bullet member and the brake member are leaf springs.

Images