JPH11205639A - Electronic image camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To arrange a filter inside a narrow space in the main body of camera concerning an electronic image camera for converting an image formed by a photographic lens to an electric signal through an imaging device such as a CCD and recording it. SOLUTION: Concerning this camera, an imaging device 4 is arranged on the optical axis of a photographic lens 2, a main mirror 5 to be turned with a terminal part on the side of the imaging device as a center is arranged between the photographic lens 2 and the imaging device 4, and a shutter 3 is arranged between the main mirror and the imaging device. In this case, a filter 9 is arranged in front of the shutter 3, and a moving means is arranged for moving the filter between a standby position for saving the filter from light flux made incident on the imaging device and a transmission position for transmitting the light flux.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic image camera for converting an image formed by a photographing lens into an electric signal by an image pickup device such as a CCD and recording the electric signal.

[0002]

2. Description of the Related Art Conventionally, there has been known an electronic image camera which converts an image formed by a photographing lens into an electric signal by an image pickup device such as a CCD and records the electric signal. In such an electronic image camera, color moire occurs when an image of a subject having a repetitive pattern exceeding a certain frequency, which is determined by the pitch of the elements, is captured because the imaging elements have a fine regular arrangement.

[0003] Conventionally, it has been known that an optical low-pass filter should be interposed in the optical system of the photographing lens in order to eliminate such a problem. FIG.
This type of single-lens reflex type electronic image camera shows
In this electronic image camera, an image sensor 102 is arranged on an optical axis L of a photographing lens 101. Shooting lens 101
A main mirror 103 that is turned around an end on the image sensor 102 side is disposed between the image sensor 102 and the image sensor 102.

[0004] A shutter 104 is arranged between the main mirror 103 and the image sensor 102. Below the main mirror 103, a focus detection device 106 that receives reflected light from a sub mirror 105 disposed on the main mirror 103 is disposed.

[0005]

However, in such a conventional single-lens reflex type electronic image camera, a main mirror 103 and a sub-mirror 105 which reciprocate are arranged between a photographing lens 101 and an image sensor 102. Therefore, there is a problem that the space for arranging the low-pass filter is very small.

The present invention has been made to solve such a conventional problem, and has as its object to provide an electronic image camera in which a filter can be arranged in a narrow space in a camera body.

[0007]

According to a first aspect of the present invention, there is provided an electronic image camera, wherein an image sensor is disposed on an optical axis of a photographing lens, and an end on the image sensor side is provided between the photographing lens and the image sensor. An electronic image camera in which a main mirror rotated around the center is disposed and a shutter is disposed between the main mirror and an image sensor, a filter is disposed in front of the shutter, and the filter is A retreat position for retreating from a light beam incident on the image sensor,
A moving means for moving between a light transmitting position and a light transmitting position is provided.

According to a second aspect of the present invention, in the electronic image camera according to the first aspect, a focus detection device that receives light reflected from a sub mirror disposed on the main mirror is disposed below the main mirror. The filter is arranged between the focus detection device and the shutter. The electronic image camera according to claim 3 is
3. The electronic image camera according to claim 1, wherein the moving unit moves the filter from the retracted position to the transmission position in synchronization with a shooting start signal, and transmits the filter in synchronization with a shooting end signal. It moves from the position to the retracted position.

According to a fourth aspect of the present invention, in the electronic image camera according to the third aspect, the moving means moves the filter from the transmission position to the retracted position in conjunction with a rotation mechanism of the main mirror. It is characterized by doing.

According to a fifth aspect of the present invention, in the electronic image camera according to the fourth aspect, the moving means includes a guide member for movably guiding the filter, and one end rotatably supported and the other end rotatably supported. A moving lever coupled to the filter for moving the filter along the guide member, a biasing means for urging the moving lever to move the filter to the transmission position side, and retracting the moving lever A moving lever is moved to the retracted position side by being pressed by a locking lever that locks to the position side, a solenoid that releases the locking of the locking lever, and a lever that is disposed in a rotation mechanism of the main mirror. And a charging lever for causing the charging lever to be operated.

(Function) In the electronic image camera of the first aspect,
A filter is arranged in front of the shutter, and the filter is moved by the moving means between a retracted position for retracting the light beam incident on the image sensor and a transmission position for transmitting the light beam. In the electronic image camera according to the second aspect, a focus detection device that receives reflected light from a sub-mirror disposed on the main mirror is disposed below the main mirror, and a filter is disposed between the focus detection device and a shutter. You.

According to the electronic image camera of the present invention, the filter is moved from the retracted position to the transparent position in conjunction with the photographing start signal, and the filter is moved from the transmissive position to the retracted position in conjunction with the photographing end signal. According to the electronic image camera of the fourth aspect, the filter is linked with the rotation mechanism of the main mirror,
It is moved from the transmission position to the retracted position.

According to the electronic image camera of the present invention, when the solenoid is operated by the input of the release signal at the time of photographing,
The locking of the locking lever to the moving lever is released, the moving lever is rotated by the urging means, the filter is guided by the guide member, and the filter is positioned at the transmission position.

When the photographing is completed, the charge lever is pressed by a lever arranged on the rotating mechanism of the main mirror, and the moving lever is moved to the retracted position.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of an electronic image camera according to the present invention will be described with reference to the drawings.

FIG. 1 shows an electronic image camera according to an embodiment of the present invention before release. In this electronic image camera, a photographing lens 2 is mounted on a mount 1a of a camera body 1. Aperture 1b of camera body 1
Immediately before, the shutter 3 is fixed.

Immediately after the aperture 1b, an image pickup device 4 comprising a CCD unit for image pickup is fixed.
A main mirror 5 is arranged between the taking lens 2 and the shutter 3. The main mirror 5 is a known mirror that reciprocates, and when the main mirror 5 is at a down position indicated by a solid line in FIG.
The light beam L1 that has passed through the photographing lens 2 is partially reflected, and the reflected light beam L2 is guided to the finder optical system 6.

The finder optical system 6 includes a screen 6A,
It has a pentaprism 6B and an eyepiece 6C. A sub mirror 7 is arranged on the main mirror 5. The sub-mirror 7 is a known mirror that reciprocates in conjunction with the main mirror 5. At the down position indicated by the solid line in FIG. It leads to the detection device 8.

The lower end 7a of the sub-mirror 7 extends to just before the shutter 3, and is located above a filter holding member 9 described later. The filter holding member 9 includes the shutter 3
And the focus detection device 8.

In the lower part 1c of the mirror box, a light receiving element 1 is provided.
0 is fixed. When the flash is used, the light receiving element 10 detects the reflected light L4 of the shutter curtain immediately after the mirror is raised and performs TTL light control. At the bottom of the camera body 1, a control device 11 for controlling a camera mechanism and an imaging process is arranged.

FIG. 2 shows details of the mirror device A for driving the main mirror 5 and the shutter device B for driving the shutter 3 described above. The motor 12 reciprocates the levers 14 and 15 via the speed reducer 13 to charge and drive the mirror device A and the shutter device B. The charge completion switch 16 detects the completion phase of the charge driving of the speed reduction device 13.

The rear curtain switch 17 is arranged in the shutter device B, and detects running of the rear curtain. The lever 15 has a shaft 19
And is rotatably supported by the speed reducer 13 at one end 15a.
Is driven counterclockwise through engagement with Urging member 2
0 applies a clockwise urging force to the lever 15. The levers 21 and 22 are rotatably supported by the shaft 23.

The ends 21a and 22a are respectively connected to the lever 1
The lever 15 is rotated counterclockwise by the counterclockwise rotation of the lever 15. Left end 2 of lever 21
1b is a locking lever 25 rotatably supported on a shaft 24.
Is locked to the locking portion 25a. Upper end 2 of lever 21
A cam 1c is engaged with one end 26a of the pin 26.

The urging member 27 applies a clockwise urging force to the lever 21. The left end 22b of the lever 22 is engaged with a member described later. One end 25 b of the lever 25 is engaged with a solenoid 28. The urging member 29 includes the lever 2
A clockwise urging force is applied to 5. The main mirror 5 is rotatably supported by coaxial shafts 30 and 31, and a pin 26 is fixed to the side portion 5a.

The urging member 32 applies a clockwise urging force to the main mirror 5. FIG. 3 shows a filter device C arranged on the front surface of the shutter 3. FIG. 3 shows a state in which a portion serving as the rear surface of the main mirror 5 is viewed from the front of the camera. Immediately before the aperture 1b, a rectangular frame-shaped filter holding member 9 is arranged.

The filter holding member 9 is attached to the camera body 1
The guide members 34 and 35 fixed to the sides support the movable members in the vertical direction in parallel with the paper surface. A filter 36 made of an optical low-pass filter is fixed to the frame 9 a of the filter holding member 9. The moving lever 37 is rotatably supported by a shaft 38.

At the right end of the moving lever 37, the guide groove 3 is provided.
7a, a locking portion 37b is provided at the center, and a pin 39 is fixedly provided. A pin 40 fixed to the filter holding member 9 is engaged with the guide groove 37a. The urging member 41 applies a counterclockwise urging force to the moving lever 37.

The locking lever 42 is rotatably supported by a shaft 49. At the tip of the locking lever 42, a key 4
2a is formed, and this key portion 42a is
7 is locked by the locking portion 37b. The other end 42b of the locking lever 42 is engaged with the solenoid 43.

The urging member 44 applies a clockwise urging force to the moving lever 37. As shown in FIG. 4, the charge lever 45 is supported by fixing pins 46 and 47 so as to be movable in the vertical direction in the figure. The upper end 45a of the charge lever 45 is engaged with one end 22b of the lever 22 shown in FIG.

A bent portion 45 b formed at the lower end of the charge lever 45 is engaged with the pin 39 of the moving lever 37. Hereinafter, the operation of the filter device C in FIG.
The operation will be described together with the operation of the mirror device A and the shutter device B in FIG. FIG. 2 shows a mirror device A and a shutter device B.
Has been charged, and the camera is ready for release.

In this state, when the solenoid 28 is operated by the input of the release signal, the locking lever 25 rotates counterclockwise, and the locking portion 25a releases the locking of the lever 21. As a result, the lever 21 is rotated clockwise by the urging force of the urging member 27, and the pin 2 is rotated by the cam portion 21c.
6 is pushed up, and the main mirror 5 is driven up.

At the same time, the sub-mirror 7 is also brought up by a known interlocking mechanism. Thereafter, during the exposure, the lever 21 is kept in the fully rotated state.
And the sub-mirror 7 both maintain the up state. On the other hand, in parallel with the above operation, the filter device C shown in FIG.
Is operated. That is, when the solenoid 43 is operated by the input of the release signal, the locking lever 42 rotates counterclockwise, and the key portion 42a releases the locking of the moving lever 37.

As a result, the moving lever 37 is rotated counterclockwise by the urging force of the urging member 41. With the rotation of the moving lever 37, the pin 40 engaging with the guide groove 37a at the tip of the moving lever 37 is moved upward in the drawing, and the filter holding member 9 is moved upward.

When the movement is completed, as shown in FIG. 5, the filter 36 is located at a position that completely covers the aperture 1b. In this embodiment, the mirror device A
And the solenoid 43 of the shutter device C
Since the power supply to the mirrors is simultaneous, the start timing of the main mirror 5 and the sub-mirror 7 and the start timing of the filter holding member 9 are simultaneously. It is configured to come.

Next, the operation after the operation of the shutter device B will be described. In FIG. 2, when the rear curtain switch 17 of the shutter device B detects the travel of the rear curtain of the shutter, the motor 1
2 is driven, and the shutter device B is charged by the lever 14. At the same time, the lever 21 is rotated counterclockwise by the lever 15, and the locking lever 2 is rotated in the fully rotated state.
5 locked.

On the other hand, the lever 22 is simultaneously rotated counterclockwise, and the left end 22b of the lever 22 moves downward in the figure. Then, as shown in FIG.
By 2b, the upper end 45a of the charge lever 45 is pushed down. As a result, the charge lever 45 moves downward in the drawing, and the moving lever 37 is rotated clockwise through the engagement with the pin 39 by the bent portion 45b of the charge lever 45.

Then, as shown in FIG. 3, the moving lever 37 is locked by the locking lever 42 in a fully rotated state. In this embodiment, the completion timing of the sub-mirror 7 and the completion timing of the lowering of the filter holding member 9 are configured so that the sub-mirror 7 goes down after the filter holding member 9 mechanically descends and retracts. Have been.

FIG. 6 is a block diagram showing a configuration related to the control of this embodiment. In this embodiment, MCU5
1, a release switch 52, a rear curtain switch 17, and a charge completion switch 16 are connected, and a solenoid drive unit 53, a magnet drive unit 54, and a motor drive unit 57 are connected. Then, the solenoid driving unit 53 includes:
The solenoid 28 and the solenoid 43 are connected.

The magnet drive unit 54 is connected to a front curtain magnet 55 and a rear curtain magnet 56 of the shutter, and the motor drive unit 57 is connected to the motor 12. Note that power supplies and the like are omitted in this block diagram. FIG. 7 is a flowchart showing processing when a release signal is input in this embodiment.

First, in step S1, the solenoid 2
8, 43, and the first curtain magnet 55 and the second curtain magnet 56 of the shutter are energized. Then, when the solenoid 28 is energized, the lever 21 rotates to start the mirror up operation. In addition, the filter holding member 9 starts to rise by energizing the solenoid 43.

Next, in step S2, it is determined whether or not the time counted by the timer starting from the release timing has reached a predetermined time t1, and if it has elapsed, the process branches to step S3, and if not, the process waits. Here, the time t1 is a time required from completion of mirror up and embossing to completion of exposure preparation.

Next, in step S3, the power supply to the shutter front curtain magnet 55 is stopped, and the front curtain starts running. Note that this starts the exposure, but the filter 3
Since the movement of 6 has been completed, the light beam that has passed through the photographing lens 2 forms an image on the image sensor 4 via the filter 36. Next, in step S4, it is determined whether or not the time counted by the timer starting from the OFF of the shutter front curtain magnet 55 has reached a predetermined time t2. If the time has elapsed, the process branches to step S5. .

The time t2 is the time at the set shutter time. Next, in step S5, the energization of the shutter rear curtain magnet 56 is stopped, whereby the rear curtain starts running. Next, in step S6, the signal of the rear curtain switch 17 that is switched at the start of the rear curtain travel is read.

Next, in step S7, the motor 12 is energized. Thereby, the charging of the mirror device A and the shutter device B is started, and the downward movement of the filter holding member 9 is started. Next, in step S8, it is determined whether or not the charge completion switch 16 has been turned off.
If so, the process branches to step S9, and if not, the process waits.

In step S9, the power supply to the motor 13 is stopped, and the motor 13 is braked. Thus, the charging of the mirror device A and the shutter device B is completed, and the routine ends. In the electronic image camera configured as described above, the filter 36 is disposed in front of the shutter 3, and the filter device C is configured to retract the filter 36 from the light beam incident on the image sensor 4 and transmit the light beam through the filter device C. Since the filter 36 is moved between the light transmitting positions, the filter 36 can be arranged in a narrow space in the camera body 1.

In the above-described electronic image camera, the filter 36 is disposed between the focus detection device 8 disposed below the main mirror 5 and the shutter 3, but when the main mirror 5 is at the down position, Since the filter 36 is located at the retracted position by the filter device C, the filter 36
Interference with the sub-mirror 7 can be reliably prevented.

Further, in the above-described electronic image camera, the filter device C is operated by the filter 36 in synchronization with the photographing start signal.
Is moved from the retracted position to the transmissive position, and the filter 36 is moved from the transmissive position to the retracted position in conjunction with the photographing end signal, so that interference between the filter 36 and the sub-mirror 7 can be easily and reliably prevented. Can be. In the electronic image camera described above, the filter device C is configured to move the filter 36 from the transmission position to the retreat position in conjunction with the rotation mechanism of the main mirror 5.
Can be easily and reliably moved from the transmission position to the retracted position.

Further, in the above-described electronic image camera, the filter device C can be surely constructed with a relatively simple structure. In the electronic image camera described above, even if the length of the sub-mirror 7 is relatively long, the filter 3
6 does not occur, and thus the distance measurement area can be arranged accurately.

That is, for example, in the case of the multi-area distance measuring system shown in FIG. 8, a plurality of distance measuring areas 58a, 58b, 58
When c, 58d, and 58e are arranged and the sub-mirror 7 is short, the position of the distance measurement area 58a in the upper direction of the screen is restricted to, for example, the distance from the center to H, but in the above-described electronic image camera, Such restrictions do not occur.

In the above embodiment, the filter 3
6 has been described in the vertical direction, but the present invention is not limited to such an embodiment.
You may make it move to a horizontal direction.

[0051]

As described above, in the electronic image camera according to the first aspect, the filter is disposed in front of the shutter, and the filter is moved by the moving means so as to be retracted from the light beam incident on the image sensor. Since the filter is moved between the light transmitting position and the light transmitting position, the filter can be arranged in a narrow space in the camera body.

According to the electronic image camera of the second aspect, the filter is disposed between the focus detecting device disposed below the main mirror and the shutter. When the main mirror is at the down position, the filter is moved by the moving means. Since it is located at the retracted position, it is possible to prevent interference between the filter and the sub mirror. In the electronic image camera according to the third aspect, the moving means moves the filter from the retracted position to the transparent position in conjunction with the photographing start signal, and moves the filter from the transmissive position to the retracted position in conjunction with the photographing end signal. Because we configured
Interference between the filter and the submirror can be easily and reliably prevented.

In the electronic image camera according to the fourth aspect, the moving means is configured to move the filter from the transmitting position to the retracted position in conjunction with the rotation mechanism of the main mirror, so that the filter is moved from the transmitting position to the retracted position. It can be moved easily and reliably. According to the electronic image camera of the fifth aspect, the moving means can be surely constituted by a relatively simple structure.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of an electronic image camera according to the present invention.

FIG. 2 is a perspective view illustrating details of a mirror device and a shutter device according to an embodiment of the electronic image camera of the present invention.

FIG. 3 is a front view illustrating details of a filter device according to an embodiment of the electronic image camera of the present invention.

FIG. 4 shows a lever 22 shown in FIG. 2 and a charge lever 45 shown in FIG.
It is a perspective view which shows the arrangement | positioning relationship.

FIG. 5 is a front view showing a state where the filter holding member has been moved upward in FIG. 3;

FIG. 6 is a block diagram illustrating control of an embodiment of the electronic image camera of the present invention.

FIG. 7 is a flowchart showing the operation of an embodiment of the electronic image camera of the present invention.

FIG. 8 is an explanatory diagram showing a distance measurement area.

FIG. 9 is an explanatory view showing a conventional single-lens reflex type electronic image camera.

[Explanation of symbols]

 REFERENCE SIGNS LIST 2 photographing lens 3 shutter 4 image sensor 5 main mirror 7 submirror 8 focus detection device 9 filter holding member 34 guide member 36 filter 37 moving lever 42 locking lever 45 charge lever A mirror device B shutter device C filter device

Claims (5)

[Claims] An image pickup device is disposed on an optical axis of a photographing lens, and a main mirror that is rotated around an end on the image pickup device side is disposed between the photographing lens and the image pickup device. An electronic image camera having a shutter disposed between the main mirror and an image sensor, wherein a filter is disposed in front of the shutter, and a retreat position for retreating the filter from a light beam incident on the image sensor. An electronic image camera, further comprising a moving means for moving between a light transmitting position and a light transmitting position. 2. The electronic image camera according to claim 1, further comprising a focus detection device disposed below the main mirror for receiving light reflected from a sub-mirror disposed on the main mirror. An electronic image camera, wherein the filter is disposed between the shutter and a shutter. 3. The electronic image camera according to claim 1, wherein the moving means moves the filter from the retracted position to the transmission position in conjunction with a photographing start signal, and in conjunction with a photographing end signal. An electronic image camera, wherein the filter is moved from the transmission position to a retract position. 4. The electronic image camera according to claim 3, wherein the moving means moves the filter from the transmission position to a retreat position in conjunction with a rotation mechanism of the main mirror. Picture camera. 5. The electronic image camera according to claim 4, wherein the moving means comprises: a guide member for movably guiding the filter; and a filter having one end rotatably supported and the other end connected to the filter. A moving lever that moves the moving lever along the guide member; a biasing unit that urges the moving lever so that the filter moves to the transmission position side; A stop lever, a solenoid that releases the lock of the lock lever, and a charge lever that is pressed by a lever disposed on a rotation mechanism of the main mirror and moves the moving lever to the retreat position side. An electronic image camera, characterized in that: