JPH08254751A - Single-lens reflex camera provided with pellicle mirror - Google Patents

Abstract

PURPOSE: To realize a proper photographing action by making the best use of the characteristic of a pellicle mirror as to a single-less reflex camera provided with the pellicle mirror. CONSTITUTION: When the up-state of a pellicle mirror is selected based on a photometry value in the case that a photograph is taken by apeture-priority mode, diaphragming is performed from an open state to a diaphragm value decided based on photometry. Then, the pellicle mirror 21 is set up and exposure is executed. After the exposure, the diaphragm is returned to the open state. When the mirror 21 is returned to a down-position and the down-state of the pellicle mirror is selected, the mirror 21 is set at the down-position as it is and the exposure is executed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention uses a pellicle mirror for the quick return mirror of a single lens reflex camera.
The present invention relates to a camera capable of shooting a pellicle mirror both in a down state and an up state.

[0002]

2. Description of the Related Art Conventionally, a single-lens reflex camera has a quick return mirror, and when exposing the film, the mirror is raised and the shutter is opened so that the light reaches the film. If so, move the mirror down so that you can see the image in the viewfinder. Further, a camera using such a quick return mirror is in a blackout state because the subject image cannot be confirmed by the finder because the mirror is raised during exposure. So, with a fixed pellicle mirror,
A product has been commercialized that does not raise the mirror even during exposure, and can always confirm the subject during exposure.

[0003]

However, a single-lens reflex camera using a fixed pellicle mirror has the advantage that the finder does not black out during release, but the amount of light reaching the film is reduced, so the same brightness is achieved. When shooting a subject with the same aperture value, there are drawbacks that the shutter speed is slower than that of a single-lens reflex camera that uses a movable quick return mirror, and that flash light emission reaches a shorter distance.

An object of the present invention is to provide a single-lens reflex camera having a pellicle mirror which eliminates the above-mentioned drawbacks of the prior art and obtains an exposure condition comparable to that of a single-lens reflex camera using a quick return mirror. To do.

[0005]

In order to achieve the above object, the present invention according to claim 1 is a single-lens reflex camera having a movable pellicle mirror, in which the pellicle mirror is set to an up position and a down position depending on a photographing mode. It can be switched to. Similarly, according to the present invention as set forth in claim 2, the pellicle mirror is in the up position during flash photography and in the down position when not in flash photography.

According to the third aspect of the present invention, the pellicle mirror is moved up when photographing with a small guide number, and the pellicle mirror is kept down when photographing with a large guide number. It is a thing. Similarly, the present invention according to claim 4 switches between a case where the pellicle mirror is up and flash photography is performed and a case where the pellicle mirror is down and flash photography is performed based on the pre-emission result.

Similarly, according to the present invention, when the subject distance is long, the pellicle mirror is up for photographing in flash photography, and when the subject distance is short, the pellicle mirror is down for photography. It was done like this.
Similarly, in the present invention as set forth in claim 6, in a single-lens reflex camera having a movable pellicle mirror and having a built-in flash device and which can be externally attached to the flash device, when the built-in flash device is used for shooting, the pellicle mirror is raised for shooting. When shooting a flash with an external flash without using the built-in flash device, the pellicle mirror is taken down.

Similarly, in the present invention as set forth in claim 7, when the feeding mode is single shooting, the pellicle mirror is up for shooting, and during continuous shooting, the pellicle mirror is down for shooting. Similarly, according to the present invention as set forth in claim 8, depending on the sensitivity of the loaded film, it is possible to switch between a case where the pellicle mirror is up for flash photography and a case where the pellicle mirror is down for flash photography. .

According to the present invention, the BV value of the photometric result is used to switch between shooting with the pellicle mirror up and shooting, and shooting with the pellicle mirror down. is there. Similarly, according to the present invention as set forth in claim 10, when the TV value calculated based on the photometric result is less than or equal to the camera shake limit value, the pellicle mirror is taken up for shooting, and when the TV value is greater than the camera shake limit value, the pellicle mirror is lowered. It was taken so far.
Similarly, in the present invention as set forth in claim 11, in a single-lens reflex camera having a movable pellicle mirror and capable of setting a silent mode, when the normal mode is set, the pellicle mirror is raised to take a picture, and when the silent mode is set, the pellicle mirror is set. It was shot down.

[0010]

According to the single-lens reflex camera having the pellicle mirror having the above-described structure, the pellicle mirror is imaged with the pellicle mirror up or down according to the photographing mode.
You can take advantage of the pellicle mirror and cover its drawbacks. Further, according to the present invention as set forth in claim 2, depending on whether or not the flash photography is used as the photography mode, the pellicle mirror is raised in the flash photography to eliminate the loss of light emission, and the pellicle mirror is taken in the down state in the normal photography. I do. Further, according to the present invention as set forth in claim 3, when the flash number is taken, the pellicle mirror is raised to cover the decrease in the guide number when the guide number is large, and when the guide number is small, the pellicle mirror is taken. Shoot down.

Further, according to the present invention as set forth in claim 4, in the case of flash emission, when the flash emission is full emission due to the pre-emission result, the pellicle mirror is raised to increase the amount of light reaching the film for photography, and the full emission is required. For example, the pellicle mirror is taken down as it is because there is enough flash light. Also,
According to the fifth aspect of the present invention, when the subject distance is long at the time of flash photography, the pellicle mirror is raised so that the exposure amount is large, and when it is close, the pellicle mirror is kept down. Further, according to the present invention as set forth in claim 6, when shooting with a built-in flash device that emits a small amount of light, the pellicle mirror is raised and when shooting with an external flash device that emits a large amount of light, the pellicle mirror remains down. To do.

Further, according to the present invention as set forth in claim 7, in the feeding mode, the pellicle mirror is raised so that the shutter can be released at a high shutter speed during the single shooting, and the subject is displayed in the viewfinder during the continuous shooting. Take a picture with the pellicle mirror down so that it will not disappear. Further, according to the present invention as set forth in claim 8, depending on the film sensitivity, if the sensitivity is low, the pellicle mirror is raised to compensate for the lack of light, and if the sensitivity is high, the image is kept down.

According to the ninth aspect of the present invention, when the BV value of the photometric result is smaller than a certain value, the pellicle mirror is up and the image is taken, and when it is bright, the image is kept down. Further, according to the present invention as set forth in claim 10, in the case of the TV value priority mode, if the TV value is equal to or less than the camera shake second, the pellicle mirror is taken up so that the shutter can be released at a faster shutter time, and a picture is taken at the shutter time. If there is, it will be taken down. Further, in the present invention as set forth in claim 11, when the silent mode is set, the image is taken without moving the pellicle mirror, so that the noise can be further reduced.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS.
It will be described based on. FIG. 1 is a block diagram of an electric circuit showing a configuration of a camera having a pellicle mirror of this embodiment. In the figure, 1 is a microcomputer (hereinafter, referred to as a microcomputer) for controlling the movement of each part of the camera, and 2 is a lens control circuit, which is an LCO from the microcomputer 1.
While receiving the M signal, serial communication is performed via the DBUS, and the motor drive information is received to drive and control the focus adjustment motor and the diaphragm blade control motor of the photographing lens 13.
At the same time, various kinds of lens information (subject distance, focal length, etc.) are sent to the microcomputer 1 by serial communication.

Reference numeral 3 denotes a liquid crystal display drive circuit, which will be described later in order to inform the photographer of the battery remaining amount of the camera, the number of shots, the TV value, the AV value, the exposure correction amount, the focus state and the like.
1 is a circuit for driving the liquid crystal display device 1, 12 and performs serial communication via DBUS while receiving the DPCOM signal from the microcomputer 1, receives display data by this serial communication, and operates the liquid crystal display devices 11, 12 according to the data. To drive.

Reference numeral 4 denotes a switch sense circuit, which is a circuit for reading a switch for the photographer to set various photographing conditions and a switch for indicating the state of the camera, and sending it to the microcomputer 1.
While receiving the SWCOM signal, the switch data is sent to the microcomputer 1 by serial communication via DBUS, and the dial value is counted up / down by the input value of the electronic dial 10 described later.
While receiving the M signal, the count value is sent to the microcomputer 1 by serial communication via DBUS.

A flash light emission dimming control circuit 5 is a circuit for controlling the light emission of the flash device and the light emission stop function by the TTL dimming. The flash light emission control circuit 5 performs serial communication with the microcomputer 1 via the DBUS while receiving the STCOM signal, receives data regarding flash light emission control, and performs various controls. Further, since this circuit 5 also functions as an interface when the external flash device 14 is attached to the camera, when the external flash device 14 is attached, the circuit 5 communicates with the external flash device 14 and the information ( It also plays a role of transmitting a control signal from the microcomputer 1 to the external flash device 14 by sending the auxiliary light).

A focus detection circuit 6 has a line sensor for performing AF by a known phase difference detection method and a circuit unit for storing and reading the line sensor, and is controlled by the microcomputer 1. That is, the microcomputer 1 uses the sensor output A / D
Based on the value, distance measurement is performed using a well-known algorithm, and the lens drive amount calculated by the calculation is communicated to the lens control circuit 2 so that the lens drive amount is calculated and then the focus is achieved. To do. Further, during manual focusing, only the focus determination is performed without driving the lens (focus aid).

Reference numeral 7 denotes a photometric circuit, which measures a subject and sends a photometric output to the microcomputer 1 under the control of the microcomputer 1. Then, the microcomputer 1 A / D-converts the sent photometric output,
Used to calculate exposure conditions (aperture, shutter speed).

Reference numeral 8 denotes a shutter control circuit, which controls traveling of a front curtain and a rear curtain of a shutter (not shown) according to a control signal from the microcomputer 1. Reference numeral 9 denotes a motor control circuit which also controls motors 15, 16 and 17 which will be described later in accordance with a control signal from the microcomputer 1.

Further, SW1 is a switch for starting the operation of the camera, and when the microcomputer 1 recognizes that it is turned on, it starts photometry, distance measurement and display. SW2 is a switch interlocking with the release button of the camera, and when the microcomputer 1 recognizes that it is turned on, it starts the exposure operation. SW3 is the camera mode (TV priority, AV priority,
This is a switch for switching between manuals and programs. Further, SWX is an X contact, which is turned on at the timing when the front curtain of the shutter is completed, and serves to inform the flash light emission control circuit 5 of the flash light emission timing.

The electronic dial 10 has a TV value, an AV value,
It is for changing the mode, for example, switch SW
When the electronic dial 10 is rotated while pressing the mode changeover switch button of 3, TV priority → AV priority → manual → program → TV priority → AV priority → manual → program ... It is changed to the mode intended by the photographer. Be changed. Further, when the electronic dial 10 is rotated in the reverse direction, the mode is changed from program → manual → AV priority → TV priority → program →. Further, the mode selector switch SW3 and the electronic dial 10 are used to
When V priority is set as the mode, the TV value desired by the photographer can be set by rotating the electronic dial 10, and when AV priority is also set as the mode, By rotating the electronic dial 10, the AV value desired by the photographer can be set.

SW4 is a switch button for setting an AV value during manual operation. When the manual is selected by the switch SW3 and the electronic dial 10, if the electronic dial 10 is rotated without pressing the switch SW4, The TV value of the rotated portion increases / decreases T
The V value can be set, and when the electronic dial 10 is rotated while pressing the switch SW4, the rotated AV value is up / down, and the AV value can be set.

The liquid crystal display device 11 is an external liquid crystal display device and is driven by the liquid crystal display drive circuit 3. The liquid crystal display device 12 is a color liquid crystal display device in a finder,
Similarly, it is driven by the liquid crystal display drive circuit 3, and the display contents are a TV value, an AV value, a bar display (exposure correction amount / exposure deviation amount are displayed), and a focus mark from the left. Furthermore, the external flash device 14 has a power source separate from the camera body. Further, the motor 15 is a feeding motor, which performs a film winding operation in one direction rotation, performs a film rewinding operation in another direction rotation, and the motor 16 is a pellicle mirror driving motor in one direction rotation, and a pellicle mirror operation in one direction rotation. The motor 17 is a sub-mirror driving and shutter charging motor, and rotates in one direction to raise / lower the sub-mirror and rotates in the other direction to perform shutter charging.

The operation of this embodiment having the above configuration will be described with reference to the flow charts of FIGS. First, in step 1, the power of the camera is turned on due to a cause such as the switch of the camera being pressed, and the process proceeds to step 2. In step 2, the mode is switched or the set value is switched based on the information of the switch sense circuit 4, and when there is a change, the liquid crystal display drive circuit 3 is communicated to correct the display data and the display color, Go to step 3. In step 3, switch SW1
It is determined whether or not is pressed. If it is pressed, the process proceeds to step 7 for photometry / distance measurement, and if it is not pressed, the process proceeds to step 4.

In step 4, it is determined whether or not the power is turned off. If it is turned off, the process proceeds to step 5, and if it is not turned off, the process returns to step 2. That is, when the power of the camera is turned on for some reason, the power is turned on for a certain period of time to check the state of the switch and switch the display. In step 5, the display of unnecessary portions inside or outside the viewfinder of the camera is turned off by the liquid crystal display drive circuit 3, the power is turned off, and the process ends in step 6.

On the other hand, when the process proceeds to step 7 in step 3, the photometric circuit 7 performs photometry of the object, the photometric output is A / D converted by the microcomputer 1, and the exposure condition (aperture, shutter speed) is calculated. Here, the exposure conditions (TV value, AV
In addition to (value), the exposure condition (TV value, AV value) when the pellicle mirror is up and exposed is calculated, and the process proceeds to step 8. In step 8, the focus is detected and stored in the line sensor using the focus detection circuit 6, distance measurement is performed by a known algorithm based on the A / D value of the sensor output, the lens drive amount is calculated, and then the focus is adjusted. As described above, the calculated lens drive amount is communicated to the lens control circuit 2, the lens is driven and focused, and the process proceeds to step 9.

In step 9, A calculated in step 7
The V value / TV value is displayed on the in-viewfinder liquid crystal display device 12 and the external liquid crystal display device 11 by the liquid crystal display drive circuit 3, and if the result of the distance measurement in step 8 is the in-focus state, the in-focus display is also performed, and the step 10 is performed. Go to.

In step 10, it is determined whether or not the state of the camera is a state in which release is permitted. For example, AF
If the mode is the "one-shot mode", the release is permitted if the distance measurement result in step 8 is in focus, and the process proceeds to step 11 to check the switch SW2.
If it is not in focus, the process returns to step 2 to check the switch. Here, when the switch SW1 is turned on, photometry / distance measurement / display is performed again.

In step 11, it is determined whether or not the switch SW2 is pressed. If the switch SW2 is on, the operation proceeds to step 12 to perform the release operation, and if it is off, the step 2 is performed to check the switch. Return to. Here, if the switch SW1 is on, the photometry /
Performs distance measurement / display. In step 12, the release operation is started.

The release operation after step 12 will be described with reference to the flowchart of FIG. Here, in the release operation, two kinds of sequences are used depending on whether the pellicle mirror is up and exposed (steps 14 to 17) or the pellicle mirror is down and exposed (steps 18 to 21). . First, the release operation is started in step 12, and step 1
Go to 3. In step 13, it is determined whether or not the pellicle mirror is raised. If it is determined that the mode for raising the pellicle mirror during exposure is selected, the process proceeds to step 14, and if not, the process proceeds to step 18.

In step 14, for exposure, the aperture value determined in step 7 is communicated to the taking lens 13 through the lens control circuit 2 to narrow the aperture of the lens.
Further, the motor control circuit 9 controls the motor 16 to move up the pellicle mirror, and controls the motor 17 to move down the sub-mirror, before proceeding to step 15. Step 1
In step 5, the shutter control circuit 8 is used to control a front film and a rear film (not shown), the film is exposed at the shutter speed determined in step 7, and the process proceeds to step 16.

In step 16, when the exposure is completed, the lens control circuit 2 communicates with the taking lens 13 to return the aperture of the lens to the open state. Further, the motor control circuit 9 controls the motor 16 to bring down the pellicle mirror, and also controls the motor 17 to return the sub-mirror to the AF-enabled standby position, and proceeds to step 17. In step 17, the motor 15 is controlled by the motor control circuit 9 to feed the film by one frame, and the process proceeds to step 22 and ends.

On the other hand, when the photographing mode with the pellicle mirror down is selected in step 13, the aperture value determined in step 7 is applied to the photographing lens 13 through the lens control circuit 2 for exposure in step 18. Communicate and narrow down the lens aperture. In addition, the motor 1 is controlled by the motor control circuit 9 with the pellicle mirror down.
7 is controlled to bring down the sub-mirror, and the process proceeds to step 19. In step 19, the shutter control circuit 8 is used to control a front film and a rear film (not shown), the film is exposed at the shutter speed determined in step 7, and the process proceeds to step 20.

In step 20, when the exposure is completed, the lens control circuit 2 communicates with the photographing lens 13 to return the aperture of the lens to the open state. Further, the motor control circuit 9 controls the motor 17 to return the sub mirror to the standby position where AF is possible, and the process proceeds to step 21. In step 21, the motor control circuit 9 controls the motor 15 to feed the film by one frame, and the process proceeds to step 22 to end the process.

FIGS. 4 and 5 show the mechanism of the release sequence with the pellicle mirror up and the release sequence with the pellicle mirror fixed at the down position. In the figure, 21
Is a pellicle mirror, 22 is a sub-mirror for guiding light to the AF optical system, 23 is a sub-mirror holding unit for holding the sub-mirror 22, and 24 is a distance measuring unit, which is located below the sub-mirror 22. 25 is the shutter front curtain,
Reference numeral 26 is a shutter rear curtain.

First, FIG. 4 shows a case where the pellicle mirror 21 is raised and exposed. FIG. 4A shows a state before exposure, the pellicle mirror 21 and the sub-mirror 22 are in a standby state, and FIG. In step 14, the pellicle mirror 21 is moved up and the sub mirror 22 is moved down, and FIG. 4C shows the state in which the pellicle mirror 21 is moved up and the down movement of the sub mirror 22 is completed.

On the other hand, FIG. 5 shows the case where the pellicle mirror 21 is exposed in the down state, FIG. 5A shows the state before the exposure, the pellicle mirror 21 and the sub-mirror 22 are in the standby state, and FIG. Shows an operation state in which only the sub-mirror 22 is moved down without moving the pellicle mirror 21 in step 18, and FIG. 5C shows a shooting state in which the down movement of the sub-mirror 22 is completed with the pellicle mirror 21 kept down. It has become.

Finally, the use of the release sequence for raising the pellicle mirror 21 and the use of the release sequence with the pellicle mirror 21 fixed at the down position will be described with reference to the flowchart of FIG. First, in step 30, the release operation is started. In step 31, it is determined whether or not flash photography is performed. If flash photography is performed, the process proceeds to step 32, and if flash photography is not performed, the process proceeds to step 33. In step 32, the steps 14 to 1 are performed.
The release sequence in which the pellicle mirror 21 is moved up and exposed as described in 7 is executed, and the process ends in step 34. Further, in step 33, the release sequence for exposing at the down position without moving the pellicle mirror 21 described in steps 18 to 21 is executed, and the process ends in step 34.

As described above, by using this embodiment, in a camera in which the pellicle mirror is fixed and does not move, the guide number in flash photography is reduced by the amount reflected by the finder optical system. Can be covered.

7 to 9 are flow charts for explaining the second embodiment of the present invention. In this embodiment, the guide number is reduced while taking advantage of the fact that it is easy to confirm that the flash device has emitted light and confirm the facial expression of the subject during shooting.

The operation of this embodiment will be described below with reference to the flow charts of FIGS. First, a case in which both series sequences are properly used with a guide number will be described with reference to the flowchart of FIG. First, the release operation is started in step 40, and the process proceeds to step 41. In step 41, it is determined whether or not the flash photography is performed. If the flash photography is performed, the process proceeds to step 42. If it is not the flash photography, the process proceeds to step 44. In step 42, the guide number is checked. If it is determined that the guide number is small, the process proceeds to step 43, and if it is determined that it is large, the process proceeds to step 44.

In step 43, a release sequence for exposing the pellicle mirror by raising it is executed, and step 4
The sequence ends at 5. On the other hand, in step 44, a release sequence for performing exposure without moving the pellicle mirror is executed, and in step 45, the sequence ends.

Next, a case will be described in which the amount of light emission is confirmed by pre-light emission according to the flowchart of FIG. First, the release operation is started in step 50, and the process proceeds to step 51. Step 5
In step 1, it is determined whether or not the flash photographing is performed. If the flash photographing is performed, the process proceeds to step 52. If the flash photographing is not performed, the process proceeds to step 55. In step 52, the pellicle mirror emits a pre-light in the down state, and the process proceeds to step 53. In step 53, it is checked whether or not the flash device emits full light as a result of pre-flash. If full flash, the process proceeds to step 54. If it is determined that full flash is not achieved, the flash light amount is the pellicle mirror. It is judged that there is still room through, and the routine proceeds to step 55.

In step 54, the release sequence described in steps 14 to 17 is performed in which the pellicle mirror is raised to expose the film even with a small amount of flash light emission, and the sequence is ended in step 56. To do. On the other hand, in step 55, the release sequence described in steps 18 to 21 in which the pellicle mirror is exposed without moving is executed, and in step 56, the sequence ends.

When the pre-light emitting means is not used, it is determined whether or not the flash light can be reached by the subject distance information at the time of focusing obtained through the lens control circuit 2 and the control aperture value, and the subject distance is determined. Depending on whether the flash light emission is far enough or far away from the light emission, it may be possible to switch between exposure with the pellicle mirror up and exposure with the pellicle mirror fixed.

Next, referring to the flowchart of FIG. 9, a case will be described in which an external device with a large light emission amount and a built-in device with a small light emission amount are used, and the two series sequences are used separately as a result. First, the release operation is started in step 60, and step 6
Proceed to 1. In step 61, it is determined whether or not the built-in flash device photographing is performed. If the built-in flash device photographing is performed, the process proceeds to step 62. If the built-in flash device photographing is not performed, the process proceeds to step 63. In step 62, the release sequence described in steps 14 to 17 in which the pellicle mirror is raised and exposed is executed, and in step 64, the sequence ends. Further, in step 63, the release sequence described in steps 18 to 21 in which the pellicle mirror is exposed without moving is executed, and in step 64, the sequence ends.

As described above, by using this embodiment, it is easy to confirm that the flash device has emitted light and the facial expression of the subject at the time of shooting, and it is possible to cover the regular guide number.

FIG. 10 is a flow chart for explaining the third embodiment of the present invention. In this embodiment, a case will be described in which a release sequence for raising the pellicle mirror and a release sequence for not raising the pellicle mirror are used separately in the feeding mode. First, the release operation is started in step 70, and the process proceeds to step 71. In step 71, it is determined whether the feeding mode is single shooting or continuous shooting. If single shooting is performed, the process proceeds to step 72, and if continuous shooting is performed, the process proceeds to step 73. In step 72, the pellicle mirror is raised and the exposure is performed.
Execute the release sequence described in step 74 and
Ends the sequence with. On the other hand, in step 73, exposure is performed without moving the pellicle mirror.
The release sequence described in step 21 is executed, and the sequence ends in step 74.

As described above, by using this embodiment, the subject does not become invisible during continuous shooting, the shutter can be released at a higher shutter speed in single shooting, and the feeling of specification is improved.

FIG. 11 is a flow chart for explaining the fourth embodiment of the present invention. In the present embodiment, a case will be described in which a release sequence for raising the pellicle mirror and a release sequence for not raising the pellicle mirror are used separately with ISO sensitivity. First, the release operation is started in step 80, and the process proceeds to step 81. In step 81, I
It is determined whether or not the SO sensitivity is high. If it is not high, the process proceeds to step 82, and if it is high, the process proceeds to step 83. In step 82, the release sequence described in steps 14 to 17 in which the pellicle mirror is raised and exposed is executed, and in step 84, the sequence ends. On the other hand, in step 83, the release sequence described in steps 18 to 21 in which the pellicle mirror is exposed without moving is executed, and in step 84, the sequence ends.

As described above, by using the present embodiment, when the sensitivity has a margin, the pellicle mirror is released with the pellicle mirror down, the characteristics of the pellicle mirror are utilized, and when the sensitivity does not have a margin, the pellicle mirror is raised. Then, it is possible to release and compensate for the lack of light.

FIG. 12 is a flow chart for explaining the fifth embodiment of the present invention. In this embodiment, a case will be described in which a release sequence in which the pellicle mirror is raised at the BV value and a release sequence in which the pellicle mirror is not raised are used separately. First, the release operation is started in step 90, and the process proceeds to step 91. In step 91, it is determined whether the BV value of the photometric result is larger (bright) or smaller than a certain value, and if it is smaller, step 92
If, on the other hand, it is determined to be larger, the process proceeds to step 93. In step 92, the release sequence described in steps 14 to 17 in which the pellicle mirror is raised and exposed is executed, and in step 94, the sequence ends. On the other hand, in step 93, the release sequence described in steps 18 to 21 in which the pellicle mirror is exposed without moving is executed, and in step 94, the sequence ends.

As described above, by using this embodiment, the pellicle mirror is released with the brightness down when there is a margin in brightness, the characteristics of the pellicle mirror are utilized, and when there is no margin in the brightness, the pellicle mirror is used. It will be possible to close the shutter and release it to compensate for the lack of light.

FIG. 13 is a flow chart for explaining the sixth embodiment of the present invention. In the present embodiment, a case will be described in which a release sequence in which the pellicle mirror is raised and a release sequence in which the pellicle mirror is not raised are used separately based on the calculated TV value. First, the release operation is started in step 100, and the process proceeds to step 101. In step 101, it is determined whether or not the TV value in the down state of the pellicle mirror calculated in step 7 is equal to or longer than a handshake limit time, and if it is determined that the shutter time is slower than the handshake limit time. The process proceeds to step 102, and when it is determined that the shutter speed is faster than the camera shake limit second, the process proceeds to step 103. In step 102, the release sequence described in steps 14 to 17 in which the pellicle mirror is raised and exposed is executed.
Ends the sequence with. On the other hand, in step 103, the exposure is performed without moving the pellicle mirror.
The release sequence described in steps 8 to 21 is executed, and the sequence ends in step 104.

As described above, by using this embodiment, the pellicle mirror is moved up so that the shutter speed is shortened even if the camera shake time is shorter than the shutter speed. If the shutter speed is high and there is a margin at the shutter speed, the pellicle mirror can be released with the pellicle mirror down, and the characteristics of the pellicle mirror can be preserved. Further, there is also a method of determining the handshake limit second based on the TV value when the pellicle mirror is in the up state.

FIG. 14 is a flow chart for explaining the seventh embodiment of the present invention. In the present embodiment, a case will be described in which it is determined whether or not the silent mode is set, and a release sequence for raising the pellicle mirror and a release sequence for not raising the pellicle mirror are used separately. Here, the silent mode is a mode in which the speed of the operation is reduced by controlling the duty of driving the motor and the operating noise is suppressed. First, the release operation is started in step 110, and the process proceeds to step 111. In step 111, it is determined whether or not the mode is the silent mode. If it is determined that the silent mode is not set, the process proceeds to step 112. If it is determined that the silent mode is set, step 11 is set.
Go to 3. In step 112, the release sequence described in steps 14 to 17 in which the pellicle mirror is raised and exposed is executed, and in step 114, the sequence ends. On the other hand, in step 113, the release sequence described in steps 18 to 21 in which the pellicle mirror is exposed without moving is executed, and in step 114, the sequence ends.

As described above, by using the present embodiment, in the silent mode, since the pellicle mirror is not moved, it is possible to further reduce the noise.

[0059]

As described above, according to the present invention as set forth in claim 1, in the single-lens reflex camera having the movable pellicle mirror, the photographing state is switched between the up position and the down position according to the photographing mode. By making it possible, it becomes possible to effectively utilize the advantages of the pellicle mirror and cover the drawbacks thereof. In addition, claim 2
In the present invention shown in 5, the shooting modes are set according to whether or not flash photography is performed, the size of the guide number at the time of flash photography, the necessity of full flash based on the pre-flash result at the time of flash photography, and the size of the subject distance at the time of flash photography. By taking a picture with the pellicle mirror up or down, the advantage of the pellicle mirror can be utilized and the picture can be taken with an appropriate exposure.

According to the present invention of claim 6, in a single-lens reflex camera having a movable pellicle mirror and having a built-in flash device and which can be externally attached to the flash device, the pellicle mirror is up during photographing by the built-in flash device. Then, when the flash image is attached externally, the pellicle mirror is kept down and the appropriate flash image can be obtained according to the amount of light emission.

Further, according to the present invention as set forth in claim 7, when the feeding mode is single shooting, the pellicle mirror is up for shooting, and during continuous shooting, the pellicle mirror is down for shooting. Can shoot at a high shutter speed, and during continuous shooting, the object image can be taken without disappearing. Further, the present invention according to claim 8 is high in sensitivity due to high and low film sensitivity, the present invention in claim 9 is high in brightness depending on the magnitude of the BV value of the photometric result, and the present invention in claim 10 is When the camera shake limit is faster than the camera shake limit second due to the extent of the camera shake limit value of the TV value due to the photometry result, the pellicle mirror is not moved and the down image is taken. It is possible to shoot while taking advantage of the advantages.

The present invention as set forth in claim 11 is a single-lens reflex camera having a movable pellicle mirror and capable of setting a silent mode, when the normal mode is set, the pellicle mirror is raised to take a picture, and when the silent mode is set, the pellicle is set. By taking a picture with the mirror down, it is possible to further reduce the noise because the pellicle mirror does not move particularly when the silent mode is set.

[Brief description of drawings]

FIG. 1 is a block diagram of an electric circuit showing a configuration of a camera having a pellicle mirror according to a first embodiment of the present invention.

FIG. 2 is a flowchart explaining the operation.

FIG. 3 is likewise a flowchart illustrating a release operation.

FIG. 4 is a configuration diagram showing a state in a release sequence in which a pellicle mirror is kept up, (a) shows a state before exposure, (b) shows an operating state, and (c) shows an operation completed state.

5A and 5B are configuration diagrams showing a state in a release sequence in which a pellicle mirror is fixed at a down position. FIG. 5A shows a state before exposure, FIG. 5B shows an operation state, and FIG. 5C shows an operation completed state. Shown respectively.

FIG. 6 is a flowchart illustrating the proper use of both release sequences of the pellicle mirror.

FIG. 7 is a flowchart illustrating an operation of the camera having the pellicle mirror according to the second embodiment of the present invention.

FIG. 8 is likewise a flow chart for explaining an operation in a situation where a flash is emitted.

FIG. 9 is likewise a flow chart for explaining the operation in a situation where a flash is emitted.

FIG. 10 is a flowchart illustrating an operation of a camera having a pellicle mirror according to a third embodiment of the present invention.

FIG. 11 is a flowchart illustrating an operation of a camera having a pellicle mirror according to a fourth embodiment of the present invention.

FIG. 12 is a flowchart illustrating an operation of a camera having a pellicle mirror according to a fifth embodiment of the present invention.

FIG. 13 is a flowchart illustrating an operation of a camera having a pellicle mirror according to a sixth embodiment of the present invention.

FIG. 14 is a flowchart illustrating an operation of a camera having a pellicle mirror according to a seventh embodiment of the present invention.

[Explanation of symbols]

1 ... Microcomputer (microcomputer) 2. Lens control circuit 3 Liquid crystal drive display circuit 4 Switch sense circuit 5 Flash control control circuit 6 Focus detection circuit 7 .Photometry circuit, 8 ... Shutter control circuit,
9 ... Motor control circuit, 10 ... Electronic dial, 11 ...
・ External display device, 12 ・ ・ Liquid crystal display device in viewfinder, 13 ・ ・ Shooting lens, 14 ・ ・ External flash device, 1
5, 16, 17 ... Motor, 21..Pellicle mirror,
22 ... Submirror, 23 ... Submirror holding unit, 24 ... Distance measuring unit, 25 ... Shutter front curtain, 2
6 ... shutter rear curtain.

Claims (11)

[Claims] 1. A single-lens reflex camera having a movable pellicle mirror, wherein the photographing state of the pellicle mirror can be switched between an up position and a down position depending on a photographing mode. . 2. A single-lens reflex camera having a pellicle mirror according to claim 1, wherein the pellicle mirror is photographed in the up position during flash photography and in the down position during non-flash photography. 3. The pellicle according to claim 1, wherein the pellicle mirror is raised during photographing with a small guide number and the pellicle mirror is kept down during photographing with a large guide number. A single-lens reflex camera with a mirror. 4. The single-lens having the pellicle mirror according to claim 1, wherein switching is performed between a case where the pellicle mirror is raised and flash photography is performed and a case where the pellicle mirror is lowered and flash photography is performed based on the pre-emission result. Reflex camera. 5. The pellicle mirror is raised for photographing when flash photography is performed when the subject distance is long, and the pellicle mirror is lowered when photography is performed for flash photography when the subject distance is short. A single-lens reflex camera having the pellicle mirror described. 6. A single-lens reflex camera having a movable pellicle mirror and having a built-in flash device and being capable of being externally attached to the flash device, when the built-in flash device is used for photographing, the pellicle mirror is raised to take a picture. A single-lens reflex camera with a pellicle mirror, which is characterized by shooting with the pellicle mirror still down when using an external flash that is not used. 7. A single-lens reflex camera having a movable pellicle mirror, when the feeding mode is single-shot, the pellicle mirror is up for shooting, and for continuous shooting, the pellicle mirror is down for shooting. SLR camera with a pellicle mirror. 8. A single-lens reflex camera having a movable pellicle mirror, in which a pellicle mirror is raised for flash photography by the sensitivity of a loaded film.
A single-lens reflex camera having a pellicle mirror, which is switched between a case where flash photography is performed with the pellicle mirror being down. 9. In a single-lens reflex camera having a movable pellicle mirror, switching between shooting with the pellicle mirror up and shooting with the pellicle mirror down depending on the BV value of the photometric result. A single-lens reflex camera with a featured pellicle mirror. 10. In a single-lens reflex camera having a movable pellicle mirror, when the TV value calculated based on the photometric result is less than or equal to the camera shake limit value, the pellicle mirror is taken up to take a picture and is larger than the camera shake limit value. In some cases, a single-lens reflex camera with a pellicle mirror is characterized by shooting with the pellicle mirror down. 11. A single-lens reflex camera having a movable pellicle mirror and capable of setting a silent mode, when the normal mode is set, the pellicle mirror is up and the image is taken, and when the silent mode is set, the pellicle mirror is taken down. A single-lens reflex camera having a pellicle mirror.