JP4667590B2 - Digital single-lens reflex camera - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a digital single-lens reflex camera provided with a focal plane shutter.
[0002]
[Prior art]
Digital cameras equipped with a focal plane shutter are equipped with optical viewfinders that allow direct observation of subject light that has passed through optical components such as lenses, as well as with cameras that use film. It is known to have an electronic viewfinder that photoelectrically converts subject light received by an element and observes it through a monitor. The electronic viewfinder can observe the subject image in the image frame to be photographed, but in order to enable observation without parallax with the optical viewfinder, a single lens reflex camera using a mirror or a pentaprism is used. It is known to configure.
[0003]
By the way, there are mainly two types of focal plane shutters used in such digital cameras. One type is equipped with two shutter blades, called the front blade and the rear blade, similar to the focal plane shutter used in cameras that use film. The imaging surface is continuously exposed by the slits formed by them. And when this type of shutter is used in a camera equipped with an optical viewfinder, it does not need to be operated in a particularly complicated manner. However, when it is used in a camera equipped with an electronic viewfinder, at least the power supply is required. When it is on, only the front blade is at the exposure operation end position and the exposure opening is fully open. At the time of photographing, it is necessary to perform the exposure operation after the front blade closes the exposure opening.
[0004]
Another type has only one shutter blade, and the exposure opening is fully opened before and during shooting, and the exposure opening is closed only at the end of shooting. is there. Accordingly, the shutter blades can be employed in cameras equipped with an optical viewfinder and a camera equipped with an electronic viewfinder without performing a complicated operation of the shutter blades. It can be said that the configuration is advantageous for obtaining the shutter speed (effective exposure time).
[0005]
On the other hand, recent cameras have become electrically driven, and in the case of a lens shutter, it has become common to use a motor to open and close shutter blades, not just a shutter for a digital camera. In the case of a focal plane shutter employed in a camera that uses film, it is natural to use a motor as a drive source for the shutter blade setting operation. Some have been proposed to be driven by a motor. It is also possible in the case of a digital camera to operate the shutter blades with a motor. In particular, a camera having an electronic viewfinder having a front blade and a rear blade. When it is adopted, it is effective to perform the complicated operation as described above.
[0006]
[Problems to be solved by the invention]
By the way, a digital single-lens reflex camera provided with an optical viewfinder can be photographed in the same manner as a camera using a film when a photographer stands upright and holds the camera with both hands. However, the digital camera has a strong image of an electronic camera, so even if the shutter sound can't be helped, the mirror sounds or the subject disappears for a moment. It is never preferable. Also, when shooting with both hands, you can't take your eyes off the viewfinder, so when shooting close-up with the camera pointing down, you have to bend and shoot in an unreasonable posture. There is inconvenience.
[0007]
On the other hand, in the case of a digital camera equipped with an electronic viewfinder, there is no operating noise of the mirror. In addition, since the camera is moved away from the body when taking a picture while holding the camera, there is an advantage that it is not necessary to bend the body too much when performing close-up photography with the camera facing downward. However, even when the photographer stands upright and holds the camera with both hands, the camera must be kept away from the body, so there is a high possibility of camera shake, and the sun is taken on the back and the shooting is performed in front light. Sometimes, there is a problem that the monitor screen is exposed to light and is difficult to see. Furthermore, when the shutter blades are all operated by a motor, it is extremely advantageous in terms of production to assemble the motor not to the camera body side but to the shutter unit. There is also the problem of how to place the unit in the camera.
[0008]
The present invention has been made to solve such problems, and an object of the present invention is to provide a focal plane shutter, and arbitrarily select an optical viewfinder and an electronic viewfinder for shooting. It is an object of the present invention to provide a digital single lens reflex camera having an extremely excellent configuration capable of doing so.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, a digital single-lens reflex camera according to the present invention includes a half mirror that splits subject light transmitted through a photographing lens into reflected light and transmitted light, and the power switch of the camera regardless of whether the power switch is on or off. An optical viewfinder system that can always observe the subject image with reflected light, and photoelectric conversion of the subject light with the transmitted light whenever the power switch is on, and image information after the photoelectric conversion is transferred to the memory at the time of shooting. An image pickup device, a monitor capable of displaying and observing a subject image with image information from the image pickup device at all times except during shooting when the power switch is on, and at least a front surface of the image pickup device. Said A focal plane shutter that fully opens the exposure aperture when the power switch is on and is not shooting. The focal plane shutter includes a front blade and a rear blade that sequentially start an exposure operation in one direction at the time of photographing. At the time of photographing, the front blade covers the exposure opening to capture the image. After discharging the charge of the element, an exposure operation is performed by the leading blade and the trailing blade, and after the exposure operation is completed, image information accumulated in the image sensor is transferred to the memory, and then only the trailing blade is restored. Let open the exposure opening Like that.
[0011]
Further, in the digital single-lens reflex camera of the present invention, in order for the half mirror to straighten the light traveling toward the imaging element and reflect the light traveling toward the optical finder system at a substantially right angle, Said The focal plane shutter drive mechanism is disposed at an inclination of approximately 45 degrees with respect to the optical axis of the photographic lens. Said If it is arranged in the vicinity of the periphery of the exposure aperture and in the direction opposite to the light reflected to the optical finder system, the arrangement of the drive mechanism in the camera is advantageous.
[0012]
In the digital single-lens reflex camera of the present invention, the exposure aperture is substantially rectangular, and the optical viewfinder system is Said Arranged on one short side of the exposure opening, the drive mechanism Said If it is arranged on the other short side of the exposure aperture, there is a wide range of selection of the appearance design of the camera.
[0013]
Furthermore, in the digital single-lens reflex camera of the present invention, each of the drive mechanisms includes a leading blade motor that operates the leading blade and a trailing blade motor that operates the trailing blade. Each blade can be operated in an arbitrary direction. When the power is turned off, the exposure opening is covered with either one of the blades, so that the control method as a digital camera can be selected.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the illustrated examples. FIG. 1 is an explanatory diagram showing the camera configuration of the embodiment. 2 and 3 show an initial state (power off state) of the focal plane shutter used in the camera of the embodiment. FIG. 2 is a view from the subject side when the camera is incorporated in the camera. FIG. 3 is a cross-sectional view of the main part viewed from below in FIG. FIG. 4 is a block diagram showing an example of a focal plane shutter control circuit in the embodiment. 5 to 11 are for explaining the operation of the focal plane shutter in the embodiment.
[0015]
Therefore, the configuration of the embodiment will be described with reference to FIGS. First, as shown in FIG. 1, in the camera of this embodiment, the subject light incident on the photographing lens 1 is dispersed by the half mirror 2 mounted at an inclination of 45 degrees with respect to the optical axis, transmitted, and travels straight. The reflected light is guided to the imaging surface of the image sensor 3, and the light reflected upward at an angle of 90 degrees is guided to the outside through the focusing screen 4, the pentaprism 5, and the eyepiece 6 of the optical finder system. It has come to be. In addition, a focal plane shutter 7 is disposed in front of the image sensor 3, and its drive mechanism 8 is located in the vicinity of the periphery of the exposure aperture and in the direction opposite to the light reflected to the optical viewfinder system. Is arranged.
[0016]
Next, the configuration of the focal plane shutter 7 will be described in detail with reference to FIGS. As shown in FIG. 3, which is a cross-sectional view of the main part of FIG. 2, the shutter base plate 9, the intermediate plate 10, and the auxiliary base plate 11 are provided with a predetermined space therebetween and are attached by appropriate means. 9 between the intermediate plate 10 and the intermediate plate 10 is the blade chamber of the leading blade 12, and between the intermediate plate 10 and the auxiliary base plate 11 is the blade chamber of the trailing blade 13, the leading blade 12 and the trailing blade 13 are shown in FIG. The illustration is omitted in FIG. As shown in FIG. 2, an opening 9 a having a rectangular shape is formed in the center of the shutter base plate 9 made of synthetic resin, but is not shown in the intermediate plate 10 and the auxiliary base plate 11. Openings having the same shape are formed, and an exposure opening is formed by arranging these three openings in an overlapping manner.
[0017]
In FIG. 2, a shaft 9 b and stoppers 9 c, 9 d, 9 e are provided on the back side of the shutter base plate 9, that is, on the image sensor 3 side, and holes formed in the intermediate plate 10 and the auxiliary base plate 11, respectively. The front end of the auxiliary base plate 11 slightly protrudes from the back side of the auxiliary base plate 11, and the front blade 12 and the rear blade 13 are rotatably attached to the shaft 9b. Further, the leading blade 12 is stopped from rotating clockwise by the stopper 9c, and the counterclockwise rotation is stopped by the protruding portion 12a coming into contact with the stopper 9d. The rotation in the counterclockwise direction is stopped by the stopper 9e, and the rotation in the clockwise direction is stopped by contacting the protruding portion 13a with the stopper 9d.
[0018]
Photo reflectors 14 and 15 are attached to the surface side of the shutter base plate 9, that is, the subject side. These photo reflectors 14 and 15 are provided with a light emitting portion and a light receiving portion (not shown), and light emitted from these light emitting portions is transmitted through holes 9f and 9g formed in the shutter base plate 9 and the intermediate plate 10. It passes through the formed holes 10a and 10b, is reflected by a reflection sheet (not shown) attached to the auxiliary base plate 11, and enters each light receiving portion. Such photo reflectors 14 and 15 are for detecting the positions of the leading blade 12 and the trailing blade 13, respectively, as will be understood from the following description. In this embodiment, among the photocouplers generally used as a photoelectric detector, a photo reflector is used. However, a photo interrupter may be used in one direction.
[0019]
A driving mechanism for the leading blade 12 and the trailing blade 13 is attached to the surface side of the shutter base plate 9. The structure of this drive mechanism is substantially the same as that of the actuator described in Japanese Patent Application Laid-Open No. 2000-60088, and two motors called moving magnet type motors are placed on one common base frame 16. It is composed. That is, the base frame 16 is made of synthetic resin, and is attached to the mounting portions 9h and 9i of the shutter base plate 9 with screws 17 and 18 as shown in FIG. Frames 19 and 20 are attached. Further, the cover frames 19 and 20 have a shape such that a cylindrical flower pot is turned upside down. As is well known, the cover frames 19 and 20 are fixed to the base frame 16 by hook portions (not shown).
[0020]
Rotors 21 and 22 having the same configuration are disposed in the hollow portions of the cover frames 19 and 20, and are supported by the cover frames 19 and 20 and the base frame 16. These rotors 21 and 22 are made of a two-pole permanent magnet magnetized in the radial direction, but in the case of this embodiment, only the rotating shaft and the portion projecting in the radial direction are made of synthetic resin. The drive pins 21a and 22a provided at the projecting portions are formed in the long holes 16a and 16b formed in the base frame 16, the shutter base plate 9, the intermediate plate 10, and the auxiliary base plate 11, respectively. It penetrates the formed elongated hole of the same shape. The drive pin 21a is fitted in the long hole 13b formed in the rear blade 13, and the drive pin 22a is fitted in the long hole 12b of the front blade 12 to rotate the front blade 12 and the rear blade 13. To get.
[0021]
In addition, coils 23 and 24 are wound around two stator frames constituted by the base frame 16 and the cover frames 19 and 20 so as to cover the bearing portions of the rotors 21 and 22. Further, the cover frames 19, 20 are each formed with four long grooves, and the iron pins 25, 26, 27, 28 are press-fitted into the long grooves of the cover frame 19, and the long grooves of the cover frame 20 are Iron pins 29, 30, 31, and 32 are press-fitted. The outer peripheral surfaces of the cover frames 21 and 22 are cylindrically shaped yaw. 3 3, 34 are fitted. In FIG. 2 (the same applies to FIGS. 5, 6, 7, 9, and 10), the boundary between the two poles of the rotors 21 and 22 is indicated by a broken line. The iron pins 25 and 26 and the iron pins 27 and 28 are arranged at positions symmetrical with respect to a straight line passing through the rotation axes of the two rotors 21 and 22, and the iron pins 29 and 30 and the iron pins 31 and 32 are also arranged at the same relative position.
[0022]
Next, an example of the control circuit of the drive mechanism configured as described above will be briefly described with reference to the block diagram shown in FIG. In FIG. 4, “the leading blade motor” is described as a motor having the rotor 22 described above, and the “rear blade motor” is a motor having the rotor 21. First, various information including luminance information of the subject is processed and input as a signal to the input circuit. As a result, it is determined whether the leading blade motor or the trailing blade motor is energized, and whether the current is supplied in the forward direction or the reverse direction, and is determined for the determined motor. The current in the opposite direction is supplied via a constant current output circuit in consideration of temperature changes and the like. Such a current supply can be performed to the two motors substantially simultaneously. In addition, each control current setting circuit is connected to a variable resistor, and the constant current value is changed by adjusting the resistance value at the time of manufacture, and the leading blade and the trailing blade are matched to meet a predetermined condition. The operating characteristics can be adjusted.
[0023]
Next, the operation of the present embodiment will be described with reference to other drawings. The “leading blade motor driving pulse” and the “rear blade motor driving pulse” described in the timing charts of FIGS. Indicates the direction and time of the current supplied to the coils 24 and 23, where the upper protrusion supplies the current in the forward direction and the lower protrusion supplies the reverse direction. Is the case. Further, the “front blade PR signal” and the “rear blade PR signal” are signals detected by the photo reflectors 14 and 15, and reflected light from the reflection sheet provided on the auxiliary base plate 11 When it receives light, it is High, and when it does not receive light, it is Low.
[0024]
1 and 2 show a state where the camera is turned off, that is, a state where the camera is not used. Therefore, the coils 23 and 24 are not energized. However, unless the vibration is excessive, the rotors 21 and 22 maintain this state, and the opening 9a, that is, the exposure opening is fully opened. Therefore, in this state, when looking into the eyepiece 6 of the optical finder, the light incident on the photographing lens 1 is reflected by the half mirror 2 and guided to the eyepiece 6 so that it can be observed at any time. ing. Further, since the exposure opening of the focal plane shutter 7 is fully open, the light incident on the photographing lens 1 is split by the half mirror 2 and guided to the image sensor 3, but the power is off. Cannot be observed on the monitor.
[0025]
Here, the reason why the rotors 21 and 22 are maintained in this state unless otherwise specified in the power-off state of FIG. 2 will be described. However, this is well known, and if the rotor 21 is described, the rotor 22 can be inevitably understood. Therefore, only the rotor 21 will be described here. In the state of FIG. 2, the attractive force acting between the N pole of the rotor 21 and the iron pin 26 is larger than the attractive force acting between the N pole and the iron pin 25. On the other hand, in the S pole, the suction force acting between the S pole and the iron pin 27 is larger than the suction force acting between the S pole and the iron pin 28. As a result, the rotor 21 is given a force that rotates clockwise, and the drive pin 21a rotates the rear blade 13 counterclockwise, so that the rear blade 13 is pressed against the stopper 9e, This state is maintained. Such a state may be maintained without the iron pins 25 and 27 or the iron pins 26 and 28 depending on conditions, but in the case of the present embodiment, these are considered with certainty. All of these are provided.
[0026]
When the power switch is turned on in the state shown in FIGS. 1 and 2, the electronic viewfinder functions. For this reason, the image formed on the image sensor 3 can be observed on the monitor. At this time, the coils 23 and 24 may not be energized. However, in the case of this embodiment, the rotors 21 and 22 may not maintain the state of FIG. As a precaution, the coils 23 and 24 are energized for a predetermined time. As a result, the coil 23 is energized in the reverse direction, so that the rotor 21 is given a force that rotates in the clockwise direction, while the coil 24 is energized in the forward direction. 2 is given a force that rotates counterclockwise, so that the state of FIG. 2 can be obtained reliably. From this, it can be said that FIG. 2 shows both the state in which the power is off and the state in which the power is on but not yet photographed. When photographing in the latter state, FIG. For the reasons already described, the photographer arbitrarily selects and shoots the optical viewfinder or the electronic viewfinder without operating the switching mechanism or the like.
[0027]
Therefore, first, the operation when flash shooting is performed will be described with reference to FIGS. 5 to 8 in addition to FIG. 2. In the operation description of this embodiment, the flash shooting mode and the normal shooting mode are switched. It is assumed that the camera is in the form of shooting. However, in this embodiment, the flash does not fire when shooting at a shutter speed faster than a predetermined shutter speed (effective exposure time), and the flash automatically fires when shooting at a predetermined shutter speed or less. It is also possible to do so, which can be understood from the following description.
[0028]
When the release button is pressed during shooting, first, the coil 24 is energized in the reverse direction at the initial stage. Therefore, the rotor 22 is rotated clockwise, and the leading blade 12 is rotated counterclockwise. Further, since the leading blade 12 retreats from the optical path of the photo reflector 14 at the initial stage of its operation, the photo reflector 14 outputs a High signal. Then, after closing the opening part 9a, the front blade | wing 12 is stopped by contact | abutting the overhang | projection part 12a to the stopper 9d, and the energization to the coil 24 is cut off immediately after that. This state is shown in FIG.
[0029]
In this way, the time during which the coil 24 is de-energized is very short. However, even at this time, the rotor 22 can maintain this state. That is, the attractive force acting between the N pole and the iron pin 30 is larger than the attractive force acting between the N pole and the iron pin 29, and the attractive force acting between the S pole and the iron pin 31. This is because the suction force acting between the S pole and the iron pin 32 is larger. Then, in the state where the opening 9a is closed in this way, when the charge accumulated in the image pickup device 3 is released so far, the preparation for photographing is ready, and the flash circuit can also function. Become.
[0030]
When the imaging preparation state is obtained, a positive current is supplied to the coil 24. Therefore, the rotor 22 is rotated counterclockwise, and the leading blade 12 is rotated clockwise to open the opening 9a. Thereafter, the front blade 12 blocks the optical path of the photoreflector 14 immediately after the opening 9a is fully opened and before it abuts against the stopper 9c. ing. When the optical path of the photoreflector 14 is interrupted, a low signal is output from the photoreflector 14, so that the flash circuit operates and the strobe emits light. As described above, in this embodiment, only after the imaging preparation state is obtained, only when the output signal of the photo reflector 15 is Low and the output signal of the photo reflector 14 changes from High to Low. Is now emitting light. Then, almost at the same time, the leading blade 12 is brought into contact with the stopper 9c and stopped. Immediately thereafter, the power supply to the coil 24 is cut off.
[0031]
Thereafter, since the coil 23 of the other motor is energized in the positive direction, the rotor 21 is rotated counterclockwise and the rear blade 13 is rotated clockwise. Therefore, the rear blade 13 closes the opening 9a, and immediately after the rear blade 13 is completely closed, the overhang 13a comes into contact with the stopper 9d and is stopped. Immediately after that, the power supply to the coil 23 is cut off, and this state is shown in FIG. Accordingly, in this case, the flash photography was performed, but the shutter speed controlled by the leading blade 12 and the trailing blade 13 is as shown in FIG. In this closed state, the imaged image signal is transferred to the memory. During this time, the rotor 21 can maintain the state shown in FIG. 7 even if the coil 23 is not energized. Is considered self-evident from the above description, and detailed description thereof is omitted.
[0032]
When the transfer of the image signal is completed as described above, the coil 23 is energized in the reverse direction, so that the rotor 21 is rotated clockwise and the rear blade 13 is rotated counterclockwise. For this reason, the rear blade 13 opens the opening 9a, and immediately stops the abutting contact with the stopper 9e. Immediately thereafter, the coil 23 is deenergized to return to the state shown in FIG. 2 when the power is on. Therefore, when performing the next shooting, it is only necessary to select one of the viewfinders and press the release button, and when the camera is not used for the time being, the power may be turned off. .
[0033]
Next, the operation when the normal shooting is performed without performing the flash shooting as described above will be described mainly with reference to FIGS. 2, 5, 7, and 9 to 11. The description overlapping with the description will be omitted or simplified. First, until the photographing is performed with the power switch turned on, the state is the same as that in the above case and is in the state of FIG. In the state shown in FIG. 2, the release button is pressed, the state shown in FIG. 5 is reached, the charge accumulated in the image pickup device 3 is released, and the preparation for shooting is completed. The same. However, since the normal shooting mode is set, the flash circuit does not function.
[0034]
When the imaging ready state is obtained in this way, a positive current is supplied to the coil 24. Therefore, the rotor 22 is rotated counterclockwise, and the leading blade 12 is rotated clockwise to open the opening 9a. However, before the leading blade 12 fully opens the opening 9a, the coil 23 Therefore, the rotor 21 is rotated counterclockwise and the rear blade 13 is rotated clockwise. As a result, the rear blade 13 closes the opening 9a, and the state at that time is shown in FIG. In this state, the output signal of the photo reflector 15 is already high.
[0035]
Thereafter, the image pickup device 3 is exposed by a slit formed by the leading blade 12 and the trailing blade 13, but immediately after the leading blade 12 fully opens the opening 9a and before contacting the stopper 9c. FIG. 10 shows the moment when the optical path of the photo reflector 14 is interrupted. When the optical path of the photoreflector 14 is interrupted, a low signal is output from the photoreflector 14, but in this case, the normal photographing mode is set and the flash circuit is set not to function. Therefore, the flash does not fire. Even if the flash circuit is set to function, the strobe does not emit light because the output signal of the photo reflector 15 is already high. As can be seen from this, the flash mode does not fire when shooting is performed at a time faster than the predetermined shutter speed, and the flash automatically fires when shooting at a shutter speed lower than the predetermined shutter speed. Can be provided.
[0036]
After the state shown in FIG. 10 is reached, the leading blade 12 comes into contact with the stopper 9c and stops. Immediately thereafter, the trailing blade 13 comes into contact with the protruding portion 13a and stops. . Further, after the leading blade 12 and the trailing blade 13 are stopped, the energization to the coil 24 and the coil 23 is also sequentially cut off, and the state shown in FIG. 7 is obtained. In this closed state, after the captured image signal is transferred to the memory, the coil 23 is energized in the reverse direction, and the rear blade 13 rotates counterclockwise and is stopped by the stopper 9e. When the power supply to the coil 23 is cut off, the state shown in FIG. 2 when the power is on is restored.
[0037]
As described above, in the case of the present embodiment, since the half mirror 2 is used, there is no operation sound of the mirror unlike the conventional digital single-lens reflex camera, and the digital camera is more suitable. . In addition, the drive mechanism is located on one short side of the rectangular exposure opening, and the leading and trailing blades are operated in a rotary manner, so the area and rotation angle of each blade can be reduced. In addition, by arranging the optical viewfinder on the other short side, the appearance of the camera can be made compact, and when shooting, the exposure aperture can be held vertically or horizontally without any discomfort. can do.
[0038]
In the above-described embodiment, the case where the exposure opening is fully opened even when the power is off is described. It is also possible to close the exposure opening with the front blade or the rear blade so that light does not strike the image sensor. In the above-described embodiment, each of the leading blade and the trailing blade, each independently operating, is composed of one blade. However, like the well-known focal plane shutter, each is composed of a plurality of blades. However, the front and rear blades may not be provided, and only one or a set of blades may be provided. Therefore, it may be a disk-shaped rotary shutter that has been known for a long time.
[0039]
Further, in the above embodiment, when the leading blade and the trailing blade perform the exposure operation, the exposure aperture always operates from the substantially left side to the right side, but the exposure is also performed when operating in the opposite direction. It is possible to make it operate. That is, when the previous shooting is completed as described above and the next shooting is performed after returning to the state of FIG. 2, the exposure opening is closed in the state of FIG. 7 instead of the state of FIG. Therefore, the exposure operation may be performed. Therefore, in that case, what was the trailing blade at the time of the previous shooting becomes the leading blade, and what was the leading blade becomes the trailing blade. This also applies to the case where only one or one set of blades is provided.
[0040]
【The invention's effect】
As described above, the digital single-lens reflex camera of the present invention can freely select and shoot an optical viewfinder and an electronic viewfinder according to the shooting environment without requiring any switching operation. It has the feature of being.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing a camera configuration of an embodiment.
FIG. 2 shows an initial state (power off state) of a focal plane shutter used in the camera of the embodiment, and is a plan view seen from the subject side when incorporated in the camera.
FIG. 3 is a cross-sectional view of a main part when viewed from below in FIG. 2;
FIG. 4 is a block diagram illustrating an example of a focal plane shutter control circuit according to the embodiment.
5 is a plan view of the configuration shown in FIG. 2 viewed in the same manner as FIG. 2, and the release is performed at the time of shooting. The The state before the exposure operation is still performed is shown.
6 is a plan view of the configuration shown in FIG. 2 viewed in the same manner as FIG. 2, and shows a state at the moment when the flash is emitted during the exposure operation.
7 is a plan view of the configuration shown in FIG. 2 as seen in FIG. 2 and shows a state immediately after the exposure operation is completed.
FIG. 8 is a timing chart necessary for explaining the case where flash photographing is performed by the focal plane shutter having the configuration shown in FIG. 2;
9 is a plan view of the configuration shown in FIG. 2 viewed in the same manner as FIG. 2, and shows a state immediately after the start of an exposure operation when no flash is emitted.
10 is a plan view of the configuration shown in FIG. 2 as seen in FIG. 2 and shows a state immediately before the end of the exposure operation when the flash is not emitted.
11 is a timing chart necessary for explaining the case where flash photographing is not performed by the focal plane shutter having the configuration shown in FIG. 2;
[Explanation of symbols]
1 Photo lens
2 Half mirror
3 Image sensor
4 Focus plate
5 Penta prism
6 Eyepiece
7 Focal plane shutter
8 Drive mechanism
9 Shutter base plate
9a opening
9b axis
9c, 9d, 9e Stopper
9f, 9g, 10a, 10b hole
9h, 9i mounting part
10 Intermediate plate
11 Auxiliary ground plane
12 leading blade
12a, 13a Overhang part
12b, 13b, 16a, 16b long hole
13 Rear blade
14,15 Photo reflector
16 Base frame
17,18 screw
19,20 Base frame
21, 22 Rotor
21a, 22a Drive pin
23, 24 coils
25, 26, 27, 28, 29, 30, 31, 32 Iron pins
33, 34 York

Claims (4)

A half mirror that splits the subject light transmitted through the photographing lens into reflected light and transmitted light, an optical viewfinder system that can always observe the subject image with the reflected light regardless of whether the camera power switch is on or off, When the power switch is on, an image sensor that performs photoelectric conversion of the subject light by the transmitted light and transfers the image information after photoelectric conversion to the memory at the time of shooting, and always when the power switch is on, except during shooting A monitor capable of displaying and observing a subject image with image information from the image sensor and an exposure aperture that is disposed in front of the image sensor and at least when the power switch is on and no image is taken. a focal plane shutter that is in the state, and wherein the focal plane shutter is sequentially during shooting A leading blade and a trailing blade that start an exposure operation in one direction, and at the time of shooting, the leading blade covers the exposure opening in the initial stage, and then discharges the charge of the imaging device; The exposure operation is performed by the rear blade, and after the exposure operation is completed, the image information stored in the image sensor is transferred to the memory, and then only the rear blade is returned to open the exposure opening. Digital SLR camera. The half mirror is inclined at approximately 45 degrees with respect to the optical axis of the photographic lens so that the light traveling toward the image sensor goes straight and reflects the light toward the optical finder system at a substantially right angle. The drive mechanism of the focal plane shutter is arranged in the vicinity of the periphery of the exposure aperture and at a position opposite to the light reflected to the optical finder system. The digital single-lens reflex camera of 1. The exposure aperture is substantially rectangular, the optical finder system is disposed on one short side of the exposure aperture, and the drive mechanism is disposed on the other short side of the exposure aperture. A digital single-lens reflex camera according to claim 2 . 4. The digital single-lens reflex camera according to claim 2 , wherein the driving mechanism includes a leading blade motor that operates the leading blade and a trailing blade motor that operates the trailing blade. 5. .

Images